2 * usb-host.c: ETRAX 100LX USB Host Controller Driver (HCD)
4 * Copyright (c) 2002, 2003 Axis Communications AB.
7 #include <linux/kernel.h>
8 #include <linux/delay.h>
9 #include <linux/ioport.h>
10 #include <linux/sched.h>
11 #include <linux/slab.h>
12 #include <linux/errno.h>
13 #include <linux/unistd.h>
14 #include <linux/interrupt.h>
15 #include <linux/init.h>
16 #include <linux/list.h>
17 #include <linux/spinlock.h>
19 #include <asm/uaccess.h>
23 #include <asm/system.h>
24 #include <asm/arch/svinto.h>
26 #include <linux/usb.h>
27 /* Ugly include because we don't live with the other host drivers. */
28 #include <../drivers/usb/core/hcd.h>
29 #include <../drivers/usb/core/usb.h>
31 #include "hc_crisv10.h"
33 #define ETRAX_USB_HC_IRQ USB_HC_IRQ_NBR
34 #define ETRAX_USB_RX_IRQ USB_DMA_RX_IRQ_NBR
35 #define ETRAX_USB_TX_IRQ USB_DMA_TX_IRQ_NBR
37 static const char *usb_hcd_version = "$Revision: 1.2 $";
48 #undef USB_DEBUG_TRACE
55 #define dbg_rh(format, arg...) printk(KERN_DEBUG __FILE__ ": (RH) " format "\n" , ## arg)
57 #define dbg_rh(format, arg...) do {} while (0)
61 #define dbg_epid(format, arg...) printk(KERN_DEBUG __FILE__ ": (EPID) " format "\n" , ## arg)
63 #define dbg_epid(format, arg...) do {} while (0)
67 #define dbg_sb(format, arg...) printk(KERN_DEBUG __FILE__ ": (SB) " format "\n" , ## arg)
69 #define dbg_sb(format, arg...) do {} while (0)
73 #define dbg_ctrl(format, arg...) printk(KERN_DEBUG __FILE__ ": (CTRL) " format "\n" , ## arg)
75 #define dbg_ctrl(format, arg...) do {} while (0)
79 #define dbg_bulk(format, arg...) printk(KERN_DEBUG __FILE__ ": (BULK) " format "\n" , ## arg)
81 #define dbg_bulk(format, arg...) do {} while (0)
85 #define dbg_intr(format, arg...) printk(KERN_DEBUG __FILE__ ": (INTR) " format "\n" , ## arg)
87 #define dbg_intr(format, arg...) do {} while (0)
91 #define dbg_isoc(format, arg...) printk(KERN_DEBUG __FILE__ ": (ISOC) " format "\n" , ## arg)
93 #define dbg_isoc(format, arg...) do {} while (0)
96 #ifdef USB_DEBUG_TRACE
97 #define DBFENTER (printk(": Entering: %s\n", __FUNCTION__))
98 #define DBFEXIT (printk(": Exiting: %s\n", __FUNCTION__))
100 #define DBFENTER do {} while (0)
101 #define DBFEXIT do {} while (0)
104 #define usb_pipeslow(pipe) (((pipe) >> 26) & 1)
106 /*-------------------------------------------------------------------
108 -------------------------------------------------------------------*/
110 static __u8 root_hub_dev_des[] =
112 0x12, /* __u8 bLength; */
113 0x01, /* __u8 bDescriptorType; Device */
114 0x00, /* __le16 bcdUSB; v1.0 */
116 0x09, /* __u8 bDeviceClass; HUB_CLASSCODE */
117 0x00, /* __u8 bDeviceSubClass; */
118 0x00, /* __u8 bDeviceProtocol; */
119 0x08, /* __u8 bMaxPacketSize0; 8 Bytes */
120 0x00, /* __le16 idVendor; */
122 0x00, /* __le16 idProduct; */
124 0x00, /* __le16 bcdDevice; */
126 0x00, /* __u8 iManufacturer; */
127 0x02, /* __u8 iProduct; */
128 0x01, /* __u8 iSerialNumber; */
129 0x01 /* __u8 bNumConfigurations; */
132 /* Configuration descriptor */
133 static __u8 root_hub_config_des[] =
135 0x09, /* __u8 bLength; */
136 0x02, /* __u8 bDescriptorType; Configuration */
137 0x19, /* __le16 wTotalLength; */
139 0x01, /* __u8 bNumInterfaces; */
140 0x01, /* __u8 bConfigurationValue; */
141 0x00, /* __u8 iConfiguration; */
142 0x40, /* __u8 bmAttributes; Bit 7: Bus-powered */
143 0x00, /* __u8 MaxPower; */
146 0x09, /* __u8 if_bLength; */
147 0x04, /* __u8 if_bDescriptorType; Interface */
148 0x00, /* __u8 if_bInterfaceNumber; */
149 0x00, /* __u8 if_bAlternateSetting; */
150 0x01, /* __u8 if_bNumEndpoints; */
151 0x09, /* __u8 if_bInterfaceClass; HUB_CLASSCODE */
152 0x00, /* __u8 if_bInterfaceSubClass; */
153 0x00, /* __u8 if_bInterfaceProtocol; */
154 0x00, /* __u8 if_iInterface; */
157 0x07, /* __u8 ep_bLength; */
158 0x05, /* __u8 ep_bDescriptorType; Endpoint */
159 0x81, /* __u8 ep_bEndpointAddress; IN Endpoint 1 */
160 0x03, /* __u8 ep_bmAttributes; Interrupt */
161 0x08, /* __le16 ep_wMaxPacketSize; 8 Bytes */
163 0xff /* __u8 ep_bInterval; 255 ms */
166 static __u8 root_hub_hub_des[] =
168 0x09, /* __u8 bLength; */
169 0x29, /* __u8 bDescriptorType; Hub-descriptor */
170 0x02, /* __u8 bNbrPorts; */
171 0x00, /* __u16 wHubCharacteristics; */
173 0x01, /* __u8 bPwrOn2pwrGood; 2ms */
174 0x00, /* __u8 bHubContrCurrent; 0 mA */
175 0x00, /* __u8 DeviceRemovable; *** 7 Ports max *** */
176 0xff /* __u8 PortPwrCtrlMask; *** 7 ports max *** */
179 static DEFINE_TIMER(bulk_start_timer, NULL, 0, 0);
180 static DEFINE_TIMER(bulk_eot_timer, NULL, 0, 0);
182 /* We want the start timer to expire before the eot timer, because the former might start
183 traffic, thus making it unnecessary for the latter to time out. */
184 #define BULK_START_TIMER_INTERVAL (HZ/10) /* 100 ms */
185 #define BULK_EOT_TIMER_INTERVAL (HZ/10+2) /* 120 ms */
187 #define OK(x) len = (x); dbg_rh("OK(%d): line: %d", x, __LINE__); break
188 #define CHECK_ALIGN(x) if (((__u32)(x)) & 0x00000003) \
189 {panic("Alignment check (DWORD) failed at %s:%s:%d\n", __FILE__, __FUNCTION__, __LINE__);}
191 #define SLAB_FLAG (in_interrupt() ? SLAB_ATOMIC : SLAB_KERNEL)
192 #define KMALLOC_FLAG (in_interrupt() ? GFP_ATOMIC : GFP_KERNEL)
194 /* Most helpful debugging aid */
195 #define assert(expr) ((void) ((expr) ? 0 : (err("assert failed at line %d",__LINE__))))
197 /* Alternative assert define which stops after a failed assert. */
199 #define assert(expr) \
202 err("assert failed at line %d",__LINE__); \
209 /* FIXME: Should RX_BUF_SIZE be a config option, or maybe we should adjust it dynamically?
210 To adjust it dynamically we would have to get an interrupt when we reach the end
211 of the rx descriptor list, or when we get close to the end, and then allocate more
214 #define NBR_OF_RX_DESC 512
215 #define RX_DESC_BUF_SIZE 1024
216 #define RX_BUF_SIZE (NBR_OF_RX_DESC * RX_DESC_BUF_SIZE)
218 /* The number of epids is, among other things, used for pre-allocating
219 ctrl, bulk and isoc EP descriptors (one for each epid).
220 Assumed to be > 1 when initiating the DMA lists. */
221 #define NBR_OF_EPIDS 32
223 /* Support interrupt traffic intervals up to 128 ms. */
224 #define MAX_INTR_INTERVAL 128
226 /* If periodic traffic (intr or isoc) is to be used, then one entry in the EP table
227 must be "invalid". By this we mean that we shouldn't care about epid attentions
228 for this epid, or at least handle them differently from epid attentions for "valid"
229 epids. This define determines which one to use (don't change it). */
230 #define INVALID_EPID 31
231 /* A special epid for the bulk dummys. */
232 #define DUMMY_EPID 30
234 /* This is just a software cache for the valid entries in R_USB_EPT_DATA. */
235 static __u32 epid_usage_bitmask;
237 /* A bitfield to keep information on in/out traffic is needed to uniquely identify
238 an endpoint on a device, since the most significant bit which indicates traffic
239 direction is lacking in the ep_id field (ETRAX epids can handle both in and
240 out traffic on endpoints that are otherwise identical). The USB framework, however,
241 relies on them to be handled separately. For example, bulk IN and OUT urbs cannot
242 be queued in the same list, since they would block each other. */
243 static __u32 epid_out_traffic;
245 /* DMA IN cache bug. Align the DMA IN buffers to 32 bytes, i.e. a cache line.
246 Since RX_DESC_BUF_SIZE is 1024 is a multiple of 32, all rx buffers will be cache aligned. */
247 static volatile unsigned char RxBuf[RX_BUF_SIZE] __attribute__ ((aligned (32)));
248 static volatile USB_IN_Desc_t RxDescList[NBR_OF_RX_DESC] __attribute__ ((aligned (4)));
250 /* Pointers into RxDescList. */
251 static volatile USB_IN_Desc_t *myNextRxDesc;
252 static volatile USB_IN_Desc_t *myLastRxDesc;
253 static volatile USB_IN_Desc_t *myPrevRxDesc;
255 /* EP descriptors must be 32-bit aligned. */
256 static volatile USB_EP_Desc_t TxCtrlEPList[NBR_OF_EPIDS] __attribute__ ((aligned (4)));
257 static volatile USB_EP_Desc_t TxBulkEPList[NBR_OF_EPIDS] __attribute__ ((aligned (4)));
258 /* After each enabled bulk EP (IN or OUT) we put two disabled EP descriptors with the eol flag set,
259 causing the DMA to stop the DMA channel. The first of these two has the intr flag set, which
260 gives us a dma8_sub0_descr interrupt. When we receive this, we advance the DMA one step in the
261 EP list and then restart the bulk channel, thus forcing a switch between bulk EP descriptors
263 static volatile USB_EP_Desc_t TxBulkDummyEPList[NBR_OF_EPIDS][2] __attribute__ ((aligned (4)));
265 static volatile USB_EP_Desc_t TxIsocEPList[NBR_OF_EPIDS] __attribute__ ((aligned (4)));
266 static volatile USB_SB_Desc_t TxIsocSB_zout __attribute__ ((aligned (4)));
268 static volatile USB_EP_Desc_t TxIntrEPList[MAX_INTR_INTERVAL] __attribute__ ((aligned (4)));
269 static volatile USB_SB_Desc_t TxIntrSB_zout __attribute__ ((aligned (4)));
271 /* A zout transfer makes a memory access at the address of its buf pointer, which means that setting
272 this buf pointer to 0 will cause an access to the flash. In addition to this, setting sw_len to 0
273 results in a 16/32 bytes (depending on DMA burst size) transfer. Instead, we set it to 1, and point
274 it to this buffer. */
275 static int zout_buffer[4] __attribute__ ((aligned (4)));
277 /* Cache for allocating new EP and SB descriptors. */
278 static kmem_cache_t *usb_desc_cache;
280 /* Cache for the registers allocated in the top half. */
281 static kmem_cache_t *top_half_reg_cache;
283 /* Cache for the data allocated in the isoc descr top half. */
284 static kmem_cache_t *isoc_compl_cache;
286 static struct usb_bus *etrax_usb_bus;
288 /* This is a circular (double-linked) list of the active urbs for each epid.
289 The head is never removed, and new urbs are linked onto the list as
290 urb_entry_t elements. Don't reference urb_list directly; use the wrapper
291 functions instead. Note that working with these lists might require spinlock
293 static struct list_head urb_list[NBR_OF_EPIDS];
295 /* Read about the need and usage of this lock in submit_ctrl_urb. */
296 static spinlock_t urb_list_lock;
298 /* Used when unlinking asynchronously. */
299 static struct list_head urb_unlink_list;
301 /* for returning string descriptors in UTF-16LE */
302 static int ascii2utf (char *ascii, __u8 *utf, int utfmax)
306 for (retval = 0; *ascii && utfmax > 1; utfmax -= 2, retval += 2) {
307 *utf++ = *ascii++ & 0x7f;
313 static int usb_root_hub_string (int id, int serial, char *type, __u8 *data, int len)
317 // assert (len > (2 * (sizeof (buf) + 1)));
318 // assert (strlen (type) <= 8);
322 *data++ = 4; *data++ = 3; /* 4 bytes data */
323 *data++ = 0; *data++ = 0; /* some language id */
327 } else if (id == 1) {
328 sprintf (buf, "%x", serial);
330 // product description
331 } else if (id == 2) {
332 sprintf (buf, "USB %s Root Hub", type);
334 // id 3 == vendor description
336 // unsupported IDs --> "stall"
340 data [0] = 2 + ascii2utf (buf, data + 2, len - 2);
345 /* Wrappers around the list functions (include/linux/list.h). */
347 static inline int urb_list_empty(int epid)
349 return list_empty(&urb_list[epid]);
352 /* Returns first urb for this epid, or NULL if list is empty. */
353 static inline struct urb *urb_list_first(int epid)
355 struct urb *first_urb = 0;
357 if (!urb_list_empty(epid)) {
358 /* Get the first urb (i.e. head->next). */
359 urb_entry_t *urb_entry = list_entry((&urb_list[epid])->next, urb_entry_t, list);
360 first_urb = urb_entry->urb;
365 /* Adds an urb_entry last in the list for this epid. */
366 static inline void urb_list_add(struct urb *urb, int epid)
368 urb_entry_t *urb_entry = (urb_entry_t *)kmalloc(sizeof(urb_entry_t), KMALLOC_FLAG);
371 urb_entry->urb = urb;
372 list_add_tail(&urb_entry->list, &urb_list[epid]);
375 /* Search through the list for an element that contains this urb. (The list
376 is expected to be short and the one we are about to delete will often be
377 the first in the list.) */
378 static inline urb_entry_t *__urb_list_entry(struct urb *urb, int epid)
380 struct list_head *entry;
381 struct list_head *tmp;
382 urb_entry_t *urb_entry;
384 list_for_each_safe(entry, tmp, &urb_list[epid]) {
385 urb_entry = list_entry(entry, urb_entry_t, list);
387 assert(urb_entry->urb);
389 if (urb_entry->urb == urb) {
396 /* Delete an urb from the list. */
397 static inline void urb_list_del(struct urb *urb, int epid)
399 urb_entry_t *urb_entry = __urb_list_entry(urb, epid);
402 /* Delete entry and free. */
403 list_del(&urb_entry->list);
407 /* Move an urb to the end of the list. */
408 static inline void urb_list_move_last(struct urb *urb, int epid)
410 urb_entry_t *urb_entry = __urb_list_entry(urb, epid);
413 list_move_tail(&urb_entry->list, &urb_list[epid]);
416 /* Get the next urb in the list. */
417 static inline struct urb *urb_list_next(struct urb *urb, int epid)
419 urb_entry_t *urb_entry = __urb_list_entry(urb, epid);
423 if (urb_entry->list.next != &urb_list[epid]) {
424 struct list_head *elem = urb_entry->list.next;
425 urb_entry = list_entry(elem, urb_entry_t, list);
426 return urb_entry->urb;
434 /* For debug purposes only. */
435 static inline void urb_list_dump(int epid)
437 struct list_head *entry;
438 struct list_head *tmp;
439 urb_entry_t *urb_entry;
442 info("Dumping urb list for epid %d", epid);
444 list_for_each_safe(entry, tmp, &urb_list[epid]) {
445 urb_entry = list_entry(entry, urb_entry_t, list);
446 info(" entry %d, urb = 0x%lx", i, (unsigned long)urb_entry->urb);
450 static void init_rx_buffers(void);
451 static int etrax_rh_unlink_urb(struct urb *urb);
452 static void etrax_rh_send_irq(struct urb *urb);
453 static void etrax_rh_init_int_timer(struct urb *urb);
454 static void etrax_rh_int_timer_do(unsigned long ptr);
456 static int etrax_usb_setup_epid(struct urb *urb);
457 static int etrax_usb_lookup_epid(struct urb *urb);
458 static int etrax_usb_allocate_epid(void);
459 static void etrax_usb_free_epid(int epid);
461 static int etrax_remove_from_sb_list(struct urb *urb);
463 static void* etrax_usb_buffer_alloc(struct usb_bus* bus, size_t size,
464 unsigned mem_flags, dma_addr_t *dma);
465 static void etrax_usb_buffer_free(struct usb_bus *bus, size_t size, void *addr, dma_addr_t dma);
467 static void etrax_usb_add_to_bulk_sb_list(struct urb *urb, int epid);
468 static void etrax_usb_add_to_ctrl_sb_list(struct urb *urb, int epid);
469 static void etrax_usb_add_to_intr_sb_list(struct urb *urb, int epid);
470 static void etrax_usb_add_to_isoc_sb_list(struct urb *urb, int epid);
472 static int etrax_usb_submit_bulk_urb(struct urb *urb);
473 static int etrax_usb_submit_ctrl_urb(struct urb *urb);
474 static int etrax_usb_submit_intr_urb(struct urb *urb);
475 static int etrax_usb_submit_isoc_urb(struct urb *urb);
477 static int etrax_usb_submit_urb(struct urb *urb, unsigned mem_flags);
478 static int etrax_usb_unlink_urb(struct urb *urb, int status);
479 static int etrax_usb_get_frame_number(struct usb_device *usb_dev);
481 static irqreturn_t etrax_usb_tx_interrupt(int irq, void *vhc, struct pt_regs *regs);
482 static irqreturn_t etrax_usb_rx_interrupt(int irq, void *vhc, struct pt_regs *regs);
483 static irqreturn_t etrax_usb_hc_interrupt_top_half(int irq, void *vhc, struct pt_regs *regs);
484 static void etrax_usb_hc_interrupt_bottom_half(void *data);
486 static void etrax_usb_isoc_descr_interrupt_bottom_half(void *data);
489 /* The following is a list of interrupt handlers for the host controller interrupts we use.
490 They are called from etrax_usb_hc_interrupt_bottom_half. */
491 static void etrax_usb_hc_isoc_eof_interrupt(void);
492 static void etrax_usb_hc_bulk_eot_interrupt(int timer_induced);
493 static void etrax_usb_hc_epid_attn_interrupt(usb_interrupt_registers_t *reg);
494 static void etrax_usb_hc_port_status_interrupt(usb_interrupt_registers_t *reg);
495 static void etrax_usb_hc_ctl_status_interrupt(usb_interrupt_registers_t *reg);
497 static int etrax_rh_submit_urb (struct urb *urb);
499 /* Forward declaration needed because they are used in the rx interrupt routine. */
500 static void etrax_usb_complete_urb(struct urb *urb, int status);
501 static void etrax_usb_complete_bulk_urb(struct urb *urb, int status);
502 static void etrax_usb_complete_ctrl_urb(struct urb *urb, int status);
503 static void etrax_usb_complete_intr_urb(struct urb *urb, int status);
504 static void etrax_usb_complete_isoc_urb(struct urb *urb, int status);
506 static int etrax_usb_hc_init(void);
507 static void etrax_usb_hc_cleanup(void);
509 static struct usb_operations etrax_usb_device_operations =
511 .get_frame_number = etrax_usb_get_frame_number,
512 .submit_urb = etrax_usb_submit_urb,
513 .unlink_urb = etrax_usb_unlink_urb,
514 .buffer_alloc = etrax_usb_buffer_alloc,
515 .buffer_free = etrax_usb_buffer_free
518 /* Note that these functions are always available in their "__" variants, for use in
519 error situations. The "__" missing variants are controlled by the USB_DEBUG_DESC/
520 USB_DEBUG_URB macros. */
521 static void __dump_urb(struct urb* purb)
523 printk("\nurb :0x%08lx\n", (unsigned long)purb);
524 printk("dev :0x%08lx\n", (unsigned long)purb->dev);
525 printk("pipe :0x%08x\n", purb->pipe);
526 printk("status :%d\n", purb->status);
527 printk("transfer_flags :0x%08x\n", purb->transfer_flags);
528 printk("transfer_buffer :0x%08lx\n", (unsigned long)purb->transfer_buffer);
529 printk("transfer_buffer_length:%d\n", purb->transfer_buffer_length);
530 printk("actual_length :%d\n", purb->actual_length);
531 printk("setup_packet :0x%08lx\n", (unsigned long)purb->setup_packet);
532 printk("start_frame :%d\n", purb->start_frame);
533 printk("number_of_packets :%d\n", purb->number_of_packets);
534 printk("interval :%d\n", purb->interval);
535 printk("error_count :%d\n", purb->error_count);
536 printk("context :0x%08lx\n", (unsigned long)purb->context);
537 printk("complete :0x%08lx\n\n", (unsigned long)purb->complete);
540 static void __dump_in_desc(volatile USB_IN_Desc_t *in)
542 printk("\nUSB_IN_Desc at 0x%08lx\n", (unsigned long)in);
543 printk(" sw_len : 0x%04x (%d)\n", in->sw_len, in->sw_len);
544 printk(" command : 0x%04x\n", in->command);
545 printk(" next : 0x%08lx\n", in->next);
546 printk(" buf : 0x%08lx\n", in->buf);
547 printk(" hw_len : 0x%04x (%d)\n", in->hw_len, in->hw_len);
548 printk(" status : 0x%04x\n\n", in->status);
551 static void __dump_sb_desc(volatile USB_SB_Desc_t *sb)
553 char tt = (sb->command & 0x30) >> 4;
570 tt_string = "unknown (weird)";
573 printk("\n USB_SB_Desc at 0x%08lx\n", (unsigned long)sb);
574 printk(" command : 0x%04x\n", sb->command);
575 printk(" rem : %d\n", (sb->command & 0x3f00) >> 8);
576 printk(" full : %d\n", (sb->command & 0x40) >> 6);
577 printk(" tt : %d (%s)\n", tt, tt_string);
578 printk(" intr : %d\n", (sb->command & 0x8) >> 3);
579 printk(" eot : %d\n", (sb->command & 0x2) >> 1);
580 printk(" eol : %d\n", sb->command & 0x1);
581 printk(" sw_len : 0x%04x (%d)\n", sb->sw_len, sb->sw_len);
582 printk(" next : 0x%08lx\n", sb->next);
583 printk(" buf : 0x%08lx\n\n", sb->buf);
587 static void __dump_ep_desc(volatile USB_EP_Desc_t *ep)
589 printk("\nUSB_EP_Desc at 0x%08lx\n", (unsigned long)ep);
590 printk(" command : 0x%04x\n", ep->command);
591 printk(" ep_id : %d\n", (ep->command & 0x1f00) >> 8);
592 printk(" enable : %d\n", (ep->command & 0x10) >> 4);
593 printk(" intr : %d\n", (ep->command & 0x8) >> 3);
594 printk(" eof : %d\n", (ep->command & 0x2) >> 1);
595 printk(" eol : %d\n", ep->command & 0x1);
596 printk(" hw_len : 0x%04x (%d)\n", ep->hw_len, ep->hw_len);
597 printk(" next : 0x%08lx\n", ep->next);
598 printk(" sub : 0x%08lx\n\n", ep->sub);
601 static inline void __dump_ep_list(int pipe_type)
603 volatile USB_EP_Desc_t *ep;
604 volatile USB_EP_Desc_t *first_ep;
605 volatile USB_SB_Desc_t *sb;
610 first_ep = &TxBulkEPList[0];
613 first_ep = &TxCtrlEPList[0];
616 first_ep = &TxIntrEPList[0];
618 case PIPE_ISOCHRONOUS:
619 first_ep = &TxIsocEPList[0];
622 warn("Cannot dump unknown traffic type");
627 printk("\n\nDumping EP list...\n\n");
631 /* Cannot phys_to_virt on 0 as it turns into 80000000, which is != 0. */
632 sb = ep->sub ? phys_to_virt(ep->sub) : 0;
635 sb = sb->next ? phys_to_virt(sb->next) : 0;
637 ep = (volatile USB_EP_Desc_t *)(phys_to_virt(ep->next));
639 } while (ep != first_ep);
642 static inline void __dump_ept_data(int epid)
645 __u32 r_usb_ept_data;
647 if (epid < 0 || epid > 31) {
648 printk("Cannot dump ept data for invalid epid %d\n", epid);
654 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
656 r_usb_ept_data = *R_USB_EPT_DATA;
657 restore_flags(flags);
659 printk("\nR_USB_EPT_DATA = 0x%x for epid %d :\n", r_usb_ept_data, epid);
660 if (r_usb_ept_data == 0) {
661 /* No need for more detailed printing. */
664 printk(" valid : %d\n", (r_usb_ept_data & 0x80000000) >> 31);
665 printk(" hold : %d\n", (r_usb_ept_data & 0x40000000) >> 30);
666 printk(" error_count_in : %d\n", (r_usb_ept_data & 0x30000000) >> 28);
667 printk(" t_in : %d\n", (r_usb_ept_data & 0x08000000) >> 27);
668 printk(" low_speed : %d\n", (r_usb_ept_data & 0x04000000) >> 26);
669 printk(" port : %d\n", (r_usb_ept_data & 0x03000000) >> 24);
670 printk(" error_code : %d\n", (r_usb_ept_data & 0x00c00000) >> 22);
671 printk(" t_out : %d\n", (r_usb_ept_data & 0x00200000) >> 21);
672 printk(" error_count_out : %d\n", (r_usb_ept_data & 0x00180000) >> 19);
673 printk(" max_len : %d\n", (r_usb_ept_data & 0x0003f800) >> 11);
674 printk(" ep : %d\n", (r_usb_ept_data & 0x00000780) >> 7);
675 printk(" dev : %d\n", (r_usb_ept_data & 0x0000003f));
678 static inline void __dump_ept_data_list(void)
682 printk("Dumping the whole R_USB_EPT_DATA list\n");
684 for (i = 0; i < 32; i++) {
688 #ifdef USB_DEBUG_DESC
689 #define dump_in_desc(...) __dump_in_desc(...)
690 #define dump_sb_desc(...) __dump_sb_desc(...)
691 #define dump_ep_desc(...) __dump_ep_desc(...)
693 #define dump_in_desc(...) do {} while (0)
694 #define dump_sb_desc(...) do {} while (0)
695 #define dump_ep_desc(...) do {} while (0)
699 #define dump_urb(x) __dump_urb(x)
701 #define dump_urb(x) do {} while (0)
704 static void init_rx_buffers(void)
710 for (i = 0; i < (NBR_OF_RX_DESC - 1); i++) {
711 RxDescList[i].sw_len = RX_DESC_BUF_SIZE;
712 RxDescList[i].command = 0;
713 RxDescList[i].next = virt_to_phys(&RxDescList[i + 1]);
714 RxDescList[i].buf = virt_to_phys(RxBuf + (i * RX_DESC_BUF_SIZE));
715 RxDescList[i].hw_len = 0;
716 RxDescList[i].status = 0;
718 /* DMA IN cache bug. (struct etrax_dma_descr has the same layout as USB_IN_Desc
719 for the relevant fields.) */
720 prepare_rx_descriptor((struct etrax_dma_descr*)&RxDescList[i]);
724 RxDescList[i].sw_len = RX_DESC_BUF_SIZE;
725 RxDescList[i].command = IO_STATE(USB_IN_command, eol, yes);
726 RxDescList[i].next = virt_to_phys(&RxDescList[0]);
727 RxDescList[i].buf = virt_to_phys(RxBuf + (i * RX_DESC_BUF_SIZE));
728 RxDescList[i].hw_len = 0;
729 RxDescList[i].status = 0;
731 myNextRxDesc = &RxDescList[0];
732 myLastRxDesc = &RxDescList[NBR_OF_RX_DESC - 1];
733 myPrevRxDesc = &RxDescList[NBR_OF_RX_DESC - 1];
735 *R_DMA_CH9_FIRST = virt_to_phys(myNextRxDesc);
736 *R_DMA_CH9_CMD = IO_STATE(R_DMA_CH9_CMD, cmd, start);
741 static void init_tx_bulk_ep(void)
747 for (i = 0; i < (NBR_OF_EPIDS - 1); i++) {
748 CHECK_ALIGN(&TxBulkEPList[i]);
749 TxBulkEPList[i].hw_len = 0;
750 TxBulkEPList[i].command = IO_FIELD(USB_EP_command, epid, i);
751 TxBulkEPList[i].sub = 0;
752 TxBulkEPList[i].next = virt_to_phys(&TxBulkEPList[i + 1]);
754 /* Initiate two EPs, disabled and with the eol flag set. No need for any
757 /* The first one has the intr flag set so we get an interrupt when the DMA
758 channel is about to become disabled. */
759 CHECK_ALIGN(&TxBulkDummyEPList[i][0]);
760 TxBulkDummyEPList[i][0].hw_len = 0;
761 TxBulkDummyEPList[i][0].command = (IO_FIELD(USB_EP_command, epid, DUMMY_EPID) |
762 IO_STATE(USB_EP_command, eol, yes) |
763 IO_STATE(USB_EP_command, intr, yes));
764 TxBulkDummyEPList[i][0].sub = 0;
765 TxBulkDummyEPList[i][0].next = virt_to_phys(&TxBulkDummyEPList[i][1]);
767 /* The second one. */
768 CHECK_ALIGN(&TxBulkDummyEPList[i][1]);
769 TxBulkDummyEPList[i][1].hw_len = 0;
770 TxBulkDummyEPList[i][1].command = (IO_FIELD(USB_EP_command, epid, DUMMY_EPID) |
771 IO_STATE(USB_EP_command, eol, yes));
772 TxBulkDummyEPList[i][1].sub = 0;
773 /* The last dummy's next pointer is the same as the current EP's next pointer. */
774 TxBulkDummyEPList[i][1].next = virt_to_phys(&TxBulkEPList[i + 1]);
777 /* Configure the last one. */
778 CHECK_ALIGN(&TxBulkEPList[i]);
779 TxBulkEPList[i].hw_len = 0;
780 TxBulkEPList[i].command = (IO_STATE(USB_EP_command, eol, yes) |
781 IO_FIELD(USB_EP_command, epid, i));
782 TxBulkEPList[i].sub = 0;
783 TxBulkEPList[i].next = virt_to_phys(&TxBulkEPList[0]);
785 /* No need configuring dummy EPs for the last one as it will never be used for
786 bulk traffic (i == INVALD_EPID at this point). */
788 /* Set up to start on the last EP so we will enable it when inserting traffic
789 for the first time (imitating the situation where the DMA has stopped
790 because there was no more traffic). */
791 *R_DMA_CH8_SUB0_EP = virt_to_phys(&TxBulkEPList[i]);
792 /* No point in starting the bulk channel yet.
793 *R_DMA_CH8_SUB0_CMD = IO_STATE(R_DMA_CH8_SUB0_CMD, cmd, start); */
797 static void init_tx_ctrl_ep(void)
803 for (i = 0; i < (NBR_OF_EPIDS - 1); i++) {
804 CHECK_ALIGN(&TxCtrlEPList[i]);
805 TxCtrlEPList[i].hw_len = 0;
806 TxCtrlEPList[i].command = IO_FIELD(USB_EP_command, epid, i);
807 TxCtrlEPList[i].sub = 0;
808 TxCtrlEPList[i].next = virt_to_phys(&TxCtrlEPList[i + 1]);
811 CHECK_ALIGN(&TxCtrlEPList[i]);
812 TxCtrlEPList[i].hw_len = 0;
813 TxCtrlEPList[i].command = (IO_STATE(USB_EP_command, eol, yes) |
814 IO_FIELD(USB_EP_command, epid, i));
816 TxCtrlEPList[i].sub = 0;
817 TxCtrlEPList[i].next = virt_to_phys(&TxCtrlEPList[0]);
819 *R_DMA_CH8_SUB1_EP = virt_to_phys(&TxCtrlEPList[0]);
820 *R_DMA_CH8_SUB1_CMD = IO_STATE(R_DMA_CH8_SUB1_CMD, cmd, start);
826 static void init_tx_intr_ep(void)
832 /* Read comment at zout_buffer declaration for an explanation to this. */
833 TxIntrSB_zout.sw_len = 1;
834 TxIntrSB_zout.next = 0;
835 TxIntrSB_zout.buf = virt_to_phys(&zout_buffer[0]);
836 TxIntrSB_zout.command = (IO_FIELD(USB_SB_command, rem, 0) |
837 IO_STATE(USB_SB_command, tt, zout) |
838 IO_STATE(USB_SB_command, full, yes) |
839 IO_STATE(USB_SB_command, eot, yes) |
840 IO_STATE(USB_SB_command, eol, yes));
842 for (i = 0; i < (MAX_INTR_INTERVAL - 1); i++) {
843 CHECK_ALIGN(&TxIntrEPList[i]);
844 TxIntrEPList[i].hw_len = 0;
845 TxIntrEPList[i].command =
846 (IO_STATE(USB_EP_command, eof, yes) |
847 IO_STATE(USB_EP_command, enable, yes) |
848 IO_FIELD(USB_EP_command, epid, INVALID_EPID));
849 TxIntrEPList[i].sub = virt_to_phys(&TxIntrSB_zout);
850 TxIntrEPList[i].next = virt_to_phys(&TxIntrEPList[i + 1]);
853 CHECK_ALIGN(&TxIntrEPList[i]);
854 TxIntrEPList[i].hw_len = 0;
855 TxIntrEPList[i].command =
856 (IO_STATE(USB_EP_command, eof, yes) |
857 IO_STATE(USB_EP_command, eol, yes) |
858 IO_STATE(USB_EP_command, enable, yes) |
859 IO_FIELD(USB_EP_command, epid, INVALID_EPID));
860 TxIntrEPList[i].sub = virt_to_phys(&TxIntrSB_zout);
861 TxIntrEPList[i].next = virt_to_phys(&TxIntrEPList[0]);
863 *R_DMA_CH8_SUB2_EP = virt_to_phys(&TxIntrEPList[0]);
864 *R_DMA_CH8_SUB2_CMD = IO_STATE(R_DMA_CH8_SUB2_CMD, cmd, start);
868 static void init_tx_isoc_ep(void)
874 /* Read comment at zout_buffer declaration for an explanation to this. */
875 TxIsocSB_zout.sw_len = 1;
876 TxIsocSB_zout.next = 0;
877 TxIsocSB_zout.buf = virt_to_phys(&zout_buffer[0]);
878 TxIsocSB_zout.command = (IO_FIELD(USB_SB_command, rem, 0) |
879 IO_STATE(USB_SB_command, tt, zout) |
880 IO_STATE(USB_SB_command, full, yes) |
881 IO_STATE(USB_SB_command, eot, yes) |
882 IO_STATE(USB_SB_command, eol, yes));
884 /* The last isochronous EP descriptor is a dummy. */
886 for (i = 0; i < (NBR_OF_EPIDS - 1); i++) {
887 CHECK_ALIGN(&TxIsocEPList[i]);
888 TxIsocEPList[i].hw_len = 0;
889 TxIsocEPList[i].command = IO_FIELD(USB_EP_command, epid, i);
890 TxIsocEPList[i].sub = 0;
891 TxIsocEPList[i].next = virt_to_phys(&TxIsocEPList[i + 1]);
894 CHECK_ALIGN(&TxIsocEPList[i]);
895 TxIsocEPList[i].hw_len = 0;
897 /* Must enable the last EP descr to get eof interrupt. */
898 TxIsocEPList[i].command = (IO_STATE(USB_EP_command, enable, yes) |
899 IO_STATE(USB_EP_command, eof, yes) |
900 IO_STATE(USB_EP_command, eol, yes) |
901 IO_FIELD(USB_EP_command, epid, INVALID_EPID));
902 TxIsocEPList[i].sub = virt_to_phys(&TxIsocSB_zout);
903 TxIsocEPList[i].next = virt_to_phys(&TxIsocEPList[0]);
905 *R_DMA_CH8_SUB3_EP = virt_to_phys(&TxIsocEPList[0]);
906 *R_DMA_CH8_SUB3_CMD = IO_STATE(R_DMA_CH8_SUB3_CMD, cmd, start);
911 static void etrax_usb_unlink_intr_urb(struct urb *urb)
913 volatile USB_EP_Desc_t *first_ep; /* First EP in the list. */
914 volatile USB_EP_Desc_t *curr_ep; /* Current EP, the iterator. */
915 volatile USB_EP_Desc_t *next_ep; /* The EP after current. */
916 volatile USB_EP_Desc_t *unlink_ep; /* The one we should remove from the list. */
920 /* Read 8.8.4 in Designer's Reference, "Removing an EP Descriptor from the List". */
924 epid = ((etrax_urb_priv_t *)urb->hcpriv)->epid;
926 first_ep = &TxIntrEPList[0];
930 /* Note that this loop removes all EP descriptors with this epid. This assumes
931 that all EP descriptors belong to the one and only urb for this epid. */
934 next_ep = (USB_EP_Desc_t *)phys_to_virt(curr_ep->next);
936 if (IO_EXTRACT(USB_EP_command, epid, next_ep->command) == epid) {
938 dbg_intr("Found EP to unlink for epid %d", epid);
940 /* This is the one we should unlink. */
943 /* Actually unlink the EP from the DMA list. */
944 curr_ep->next = unlink_ep->next;
946 /* Wait until the DMA is no longer at this descriptor. */
947 while (*R_DMA_CH8_SUB2_EP == virt_to_phys(unlink_ep));
949 /* Now we are free to remove it and its SB descriptor.
950 Note that it is assumed here that there is only one sb in the
951 sb list for this ep. */
952 kmem_cache_free(usb_desc_cache, phys_to_virt(unlink_ep->sub));
953 kmem_cache_free(usb_desc_cache, (USB_EP_Desc_t *)unlink_ep);
956 curr_ep = phys_to_virt(curr_ep->next);
958 } while (curr_ep != first_ep);
962 void etrax_usb_do_intr_recover(int epid)
964 USB_EP_Desc_t *first_ep, *tmp_ep;
968 first_ep = (USB_EP_Desc_t *)phys_to_virt(*R_DMA_CH8_SUB2_EP);
971 /* What this does is simply to walk the list of interrupt
972 ep descriptors and enable those that are disabled. */
975 if (IO_EXTRACT(USB_EP_command, epid, tmp_ep->command) == epid &&
976 !(tmp_ep->command & IO_MASK(USB_EP_command, enable))) {
977 tmp_ep->command |= IO_STATE(USB_EP_command, enable, yes);
980 tmp_ep = (USB_EP_Desc_t *)phys_to_virt(tmp_ep->next);
982 } while (tmp_ep != first_ep);
988 static int etrax_rh_unlink_urb (struct urb *urb)
994 hc = urb->dev->bus->hcpriv;
996 if (hc->rh.urb == urb) {
998 del_timer(&hc->rh.rh_int_timer);
1005 static void etrax_rh_send_irq(struct urb *urb)
1008 etrax_hc_t *hc = urb->dev->bus->hcpriv;
1012 dbg_rh("R_USB_FM_NUMBER : 0x%08X", *R_USB_FM_NUMBER);
1013 dbg_rh("R_USB_FM_REMAINING: 0x%08X", *R_USB_FM_REMAINING);
1016 data |= (hc->rh.wPortChange_1) ? (1 << 1) : 0;
1017 data |= (hc->rh.wPortChange_2) ? (1 << 2) : 0;
1019 *((__u16 *)urb->transfer_buffer) = cpu_to_le16(data);
1020 /* FIXME: Why is actual_length set to 1 when data is 2 bytes?
1021 Since only 1 byte is used, why not declare data as __u8? */
1022 urb->actual_length = 1;
1025 if (hc->rh.send && urb->complete) {
1026 dbg_rh("wPortChange_1: 0x%04X", hc->rh.wPortChange_1);
1027 dbg_rh("wPortChange_2: 0x%04X", hc->rh.wPortChange_2);
1029 urb->complete(urb, NULL);
1035 static void etrax_rh_init_int_timer(struct urb *urb)
1041 hc = urb->dev->bus->hcpriv;
1042 hc->rh.interval = urb->interval;
1043 init_timer(&hc->rh.rh_int_timer);
1044 hc->rh.rh_int_timer.function = etrax_rh_int_timer_do;
1045 hc->rh.rh_int_timer.data = (unsigned long)urb;
1046 /* FIXME: Is the jiffies resolution enough? All intervals < 10 ms will be mapped
1047 to 0, and the rest to the nearest lower 10 ms. */
1048 hc->rh.rh_int_timer.expires = jiffies + ((HZ * hc->rh.interval) / 1000);
1049 add_timer(&hc->rh.rh_int_timer);
1054 static void etrax_rh_int_timer_do(unsigned long ptr)
1061 urb = (struct urb*)ptr;
1062 hc = urb->dev->bus->hcpriv;
1065 etrax_rh_send_irq(urb);
1071 static int etrax_usb_setup_epid(struct urb *urb)
1074 char devnum, endpoint, out_traffic, slow;
1076 unsigned long flags;
1080 epid = etrax_usb_lookup_epid(urb);
1082 /* An epid that fits this urb has been found. */
1087 /* We must find and initiate a new epid for this urb. */
1088 epid = etrax_usb_allocate_epid();
1091 /* Failed to allocate a new epid. */
1096 /* We now have a new epid to use. Initiate it. */
1097 set_bit(epid, (void *)&epid_usage_bitmask);
1099 devnum = usb_pipedevice(urb->pipe);
1100 endpoint = usb_pipeendpoint(urb->pipe);
1101 slow = usb_pipeslow(urb->pipe);
1102 maxlen = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
1103 if (usb_pipetype(urb->pipe) == PIPE_CONTROL) {
1104 /* We want both IN and OUT control traffic to be put on the same EP/SB list. */
1107 out_traffic = usb_pipeout(urb->pipe);
1113 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
1116 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
1117 *R_USB_EPT_DATA_ISO = IO_STATE(R_USB_EPT_DATA_ISO, valid, yes) |
1118 /* FIXME: Change any to the actual port? */
1119 IO_STATE(R_USB_EPT_DATA_ISO, port, any) |
1120 IO_FIELD(R_USB_EPT_DATA_ISO, max_len, maxlen) |
1121 IO_FIELD(R_USB_EPT_DATA_ISO, ep, endpoint) |
1122 IO_FIELD(R_USB_EPT_DATA_ISO, dev, devnum);
1124 *R_USB_EPT_DATA = IO_STATE(R_USB_EPT_DATA, valid, yes) |
1125 IO_FIELD(R_USB_EPT_DATA, low_speed, slow) |
1126 /* FIXME: Change any to the actual port? */
1127 IO_STATE(R_USB_EPT_DATA, port, any) |
1128 IO_FIELD(R_USB_EPT_DATA, max_len, maxlen) |
1129 IO_FIELD(R_USB_EPT_DATA, ep, endpoint) |
1130 IO_FIELD(R_USB_EPT_DATA, dev, devnum);
1133 restore_flags(flags);
1136 set_bit(epid, (void *)&epid_out_traffic);
1138 clear_bit(epid, (void *)&epid_out_traffic);
1141 dbg_epid("Setting up epid %d with devnum %d, endpoint %d and max_len %d (%s)",
1142 epid, devnum, endpoint, maxlen, out_traffic ? "OUT" : "IN");
1148 static void etrax_usb_free_epid(int epid)
1150 unsigned long flags;
1154 if (!test_bit(epid, (void *)&epid_usage_bitmask)) {
1155 warn("Trying to free unused epid %d", epid);
1163 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
1165 while (*R_USB_EPT_DATA & IO_MASK(R_USB_EPT_DATA, hold));
1166 /* This will, among other things, set the valid field to 0. */
1167 *R_USB_EPT_DATA = 0;
1168 restore_flags(flags);
1170 clear_bit(epid, (void *)&epid_usage_bitmask);
1173 dbg_epid("Freed epid %d", epid);
1178 static int etrax_usb_lookup_epid(struct urb *urb)
1182 char devnum, endpoint, slow, out_traffic;
1184 unsigned long flags;
1188 devnum = usb_pipedevice(urb->pipe);
1189 endpoint = usb_pipeendpoint(urb->pipe);
1190 slow = usb_pipeslow(urb->pipe);
1191 maxlen = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
1192 if (usb_pipetype(urb->pipe) == PIPE_CONTROL) {
1193 /* We want both IN and OUT control traffic to be put on the same EP/SB list. */
1196 out_traffic = usb_pipeout(urb->pipe);
1199 /* Step through att epids. */
1200 for (i = 0; i < NBR_OF_EPIDS; i++) {
1201 if (test_bit(i, (void *)&epid_usage_bitmask) &&
1202 test_bit(i, (void *)&epid_out_traffic) == out_traffic) {
1206 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, i);
1209 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
1210 data = *R_USB_EPT_DATA_ISO;
1211 restore_flags(flags);
1213 if ((IO_MASK(R_USB_EPT_DATA_ISO, valid) & data) &&
1214 (IO_EXTRACT(R_USB_EPT_DATA_ISO, dev, data) == devnum) &&
1215 (IO_EXTRACT(R_USB_EPT_DATA_ISO, ep, data) == endpoint) &&
1216 (IO_EXTRACT(R_USB_EPT_DATA_ISO, max_len, data) == maxlen)) {
1217 dbg_epid("Found epid %d for devnum %d, endpoint %d (%s)",
1218 i, devnum, endpoint, out_traffic ? "OUT" : "IN");
1223 data = *R_USB_EPT_DATA;
1224 restore_flags(flags);
1226 if ((IO_MASK(R_USB_EPT_DATA, valid) & data) &&
1227 (IO_EXTRACT(R_USB_EPT_DATA, dev, data) == devnum) &&
1228 (IO_EXTRACT(R_USB_EPT_DATA, ep, data) == endpoint) &&
1229 (IO_EXTRACT(R_USB_EPT_DATA, low_speed, data) == slow) &&
1230 (IO_EXTRACT(R_USB_EPT_DATA, max_len, data) == maxlen)) {
1231 dbg_epid("Found epid %d for devnum %d, endpoint %d (%s)",
1232 i, devnum, endpoint, out_traffic ? "OUT" : "IN");
1244 static int etrax_usb_allocate_epid(void)
1250 for (i = 0; i < NBR_OF_EPIDS; i++) {
1251 if (!test_bit(i, (void *)&epid_usage_bitmask)) {
1252 dbg_epid("Found free epid %d", i);
1258 dbg_epid("Found no free epids");
1263 static int etrax_usb_submit_urb(struct urb *urb, unsigned mem_flags)
1270 if (!urb->dev || !urb->dev->bus) {
1273 if (usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe)) <= 0) {
1274 info("Submit urb to pipe with maxpacketlen 0, pipe 0x%X\n", urb->pipe);
1280 warn("urb->timeout specified, ignoring.");
1283 hc = (etrax_hc_t*)urb->dev->bus->hcpriv;
1285 if (usb_pipedevice(urb->pipe) == hc->rh.devnum) {
1286 /* This request is for the Virtual Root Hub. */
1287 ret = etrax_rh_submit_urb(urb);
1289 } else if (usb_pipetype(urb->pipe) == PIPE_BULK) {
1291 ret = etrax_usb_submit_bulk_urb(urb);
1293 } else if (usb_pipetype(urb->pipe) == PIPE_CONTROL) {
1295 ret = etrax_usb_submit_ctrl_urb(urb);
1297 } else if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT) {
1300 if (urb->bandwidth == 0) {
1301 bustime = usb_check_bandwidth(urb->dev, urb);
1305 ret = etrax_usb_submit_intr_urb(urb);
1307 usb_claim_bandwidth(urb->dev, urb, bustime, 0);
1310 /* Bandwidth already set. */
1311 ret = etrax_usb_submit_intr_urb(urb);
1314 } else if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
1317 if (urb->bandwidth == 0) {
1318 bustime = usb_check_bandwidth(urb->dev, urb);
1322 ret = etrax_usb_submit_isoc_urb(urb);
1324 usb_claim_bandwidth(urb->dev, urb, bustime, 0);
1327 /* Bandwidth already set. */
1328 ret = etrax_usb_submit_isoc_urb(urb);
1335 printk("Submit URB error %d\n", ret);
1340 static int etrax_usb_unlink_urb(struct urb *urb, int status)
1343 etrax_urb_priv_t *urb_priv;
1353 /* Disable interrupts here since a descriptor interrupt for the isoc epid
1354 will modify the sb list. This could possibly be done more granular, but
1355 unlink_urb should not be used frequently anyway.
1361 if (!urb->dev || !urb->dev->bus) {
1362 restore_flags(flags);
1366 /* This happens if a device driver calls unlink on an urb that
1367 was never submitted (lazy driver) or if the urb was completed
1368 while unlink was being called. */
1369 restore_flags(flags);
1372 if (urb->transfer_flags & URB_ASYNC_UNLINK) {
1374 /* If URB_ASYNC_UNLINK is set:
1376 move to a separate urb list
1377 call complete at next sof with ECONNRESET
1382 call complete with ENOENT
1384 warn("URB_ASYNC_UNLINK set, ignoring.");
1387 /* One might think that urb->status = -EINPROGRESS would be a requirement for unlinking,
1388 but that doesn't work for interrupt and isochronous traffic since they are completed
1389 repeatedly, and urb->status is set then. That may in itself be a bug though. */
1391 hc = urb->dev->bus->hcpriv;
1392 urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
1393 epid = urb_priv->epid;
1395 /* Set the urb status (synchronous unlink). */
1396 urb->status = -ENOENT;
1397 urb_priv->urb_state = UNLINK;
1399 if (usb_pipedevice(urb->pipe) == hc->rh.devnum) {
1401 ret = etrax_rh_unlink_urb(urb);
1403 restore_flags(flags);
1406 } else if (usb_pipetype(urb->pipe) == PIPE_BULK) {
1408 dbg_bulk("Unlink of bulk urb (0x%lx)", (unsigned long)urb);
1410 if (TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable)) {
1411 /* The EP was enabled, disable it and wait. */
1412 TxBulkEPList[epid].command &= ~IO_MASK(USB_EP_command, enable);
1414 /* Ah, the luxury of busy-wait. */
1415 while (*R_DMA_CH8_SUB0_EP == virt_to_phys(&TxBulkEPList[epid]));
1417 /* Kicking dummy list out of the party. */
1418 TxBulkEPList[epid].next = virt_to_phys(&TxBulkEPList[(epid + 1) % NBR_OF_EPIDS]);
1420 } else if (usb_pipetype(urb->pipe) == PIPE_CONTROL) {
1422 dbg_ctrl("Unlink of ctrl urb (0x%lx)", (unsigned long)urb);
1424 if (TxCtrlEPList[epid].command & IO_MASK(USB_EP_command, enable)) {
1425 /* The EP was enabled, disable it and wait. */
1426 TxCtrlEPList[epid].command &= ~IO_MASK(USB_EP_command, enable);
1428 /* Ah, the luxury of busy-wait. */
1429 while (*R_DMA_CH8_SUB1_EP == virt_to_phys(&TxCtrlEPList[epid]));
1432 } else if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT) {
1434 dbg_intr("Unlink of intr urb (0x%lx)", (unsigned long)urb);
1436 /* Separate function because it's a tad more complicated. */
1437 etrax_usb_unlink_intr_urb(urb);
1439 } else if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
1441 dbg_isoc("Unlink of isoc urb (0x%lx)", (unsigned long)urb);
1443 if (TxIsocEPList[epid].command & IO_MASK(USB_EP_command, enable)) {
1444 /* The EP was enabled, disable it and wait. */
1445 TxIsocEPList[epid].command &= ~IO_MASK(USB_EP_command, enable);
1447 /* Ah, the luxury of busy-wait. */
1448 while (*R_DMA_CH8_SUB3_EP == virt_to_phys(&TxIsocEPList[epid]));
1452 /* Note that we need to remove the urb from the urb list *before* removing its SB
1453 descriptors. (This means that the isoc eof handler might get a null urb when we
1454 are unlinking the last urb.) */
1456 if (usb_pipetype(urb->pipe) == PIPE_BULK) {
1458 urb_list_del(urb, epid);
1459 TxBulkEPList[epid].sub = 0;
1460 etrax_remove_from_sb_list(urb);
1462 } else if (usb_pipetype(urb->pipe) == PIPE_CONTROL) {
1464 urb_list_del(urb, epid);
1465 TxCtrlEPList[epid].sub = 0;
1466 etrax_remove_from_sb_list(urb);
1468 } else if (usb_pipetype(urb->pipe) == PIPE_INTERRUPT) {
1470 urb_list_del(urb, epid);
1471 /* Sanity check (should never happen). */
1472 assert(urb_list_empty(epid));
1474 /* Release allocated bandwidth. */
1475 usb_release_bandwidth(urb->dev, urb, 0);
1477 } else if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
1479 if (usb_pipeout(urb->pipe)) {
1481 USB_SB_Desc_t *iter_sb, *prev_sb, *next_sb;
1483 if (__urb_list_entry(urb, epid)) {
1485 urb_list_del(urb, epid);
1486 iter_sb = TxIsocEPList[epid].sub ? phys_to_virt(TxIsocEPList[epid].sub) : 0;
1488 while (iter_sb && (iter_sb != urb_priv->first_sb)) {
1490 iter_sb = iter_sb->next ? phys_to_virt(iter_sb->next) : 0;
1494 /* Unlink of the URB currently being transmitted. */
1496 iter_sb = TxIsocEPList[epid].sub ? phys_to_virt(TxIsocEPList[epid].sub) : 0;
1499 while (iter_sb && (iter_sb != urb_priv->last_sb)) {
1500 iter_sb = iter_sb->next ? phys_to_virt(iter_sb->next) : 0;
1503 next_sb = iter_sb->next ? phys_to_virt(iter_sb->next) : 0;
1505 /* This should only happen if the DMA has completed
1506 processing the SB list for this EP while interrupts
1508 dbg_isoc("Isoc urb not found, already sent?");
1512 prev_sb->next = next_sb ? virt_to_phys(next_sb) : 0;
1514 TxIsocEPList[epid].sub = next_sb ? virt_to_phys(next_sb) : 0;
1517 etrax_remove_from_sb_list(urb);
1518 if (urb_list_empty(epid)) {
1519 TxIsocEPList[epid].sub = 0;
1520 dbg_isoc("Last isoc out urb epid %d", epid);
1521 } else if (next_sb || prev_sb) {
1522 dbg_isoc("Re-enable isoc out epid %d", epid);
1524 TxIsocEPList[epid].hw_len = 0;
1525 TxIsocEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes);
1527 TxIsocEPList[epid].sub = 0;
1528 dbg_isoc("URB list non-empty and no SB list, EP disabled");
1531 dbg_isoc("Urb 0x%p not found, completed already?", urb);
1535 urb_list_del(urb, epid);
1537 /* For in traffic there is only one SB descriptor for each EP even
1538 though there may be several urbs (all urbs point at the same SB). */
1539 if (urb_list_empty(epid)) {
1540 /* No more urbs, remove the SB. */
1541 TxIsocEPList[epid].sub = 0;
1542 etrax_remove_from_sb_list(urb);
1544 TxIsocEPList[epid].hw_len = 0;
1545 TxIsocEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes);
1548 /* Release allocated bandwidth. */
1549 usb_release_bandwidth(urb->dev, urb, 1);
1551 /* Free the epid if urb list is empty. */
1552 if (urb_list_empty(epid)) {
1553 etrax_usb_free_epid(epid);
1555 restore_flags(flags);
1557 /* Must be done before calling completion handler. */
1561 if (urb->complete) {
1562 urb->complete(urb, NULL);
1569 static int etrax_usb_get_frame_number(struct usb_device *usb_dev)
1573 return (*R_USB_FM_NUMBER & 0x7ff);
1576 static irqreturn_t etrax_usb_tx_interrupt(int irq, void *vhc, struct pt_regs *regs)
1580 /* This interrupt handler could be used when unlinking EP descriptors. */
1582 if (*R_IRQ_READ2 & IO_MASK(R_IRQ_READ2, dma8_sub0_descr)) {
1585 //dbg_bulk("dma8_sub0_descr (BULK) intr.");
1587 /* It should be safe clearing the interrupt here, since we don't expect to get a new
1588 one until we restart the bulk channel. */
1589 *R_DMA_CH8_SUB0_CLR_INTR = IO_STATE(R_DMA_CH8_SUB0_CLR_INTR, clr_descr, do);
1591 /* Wait while the DMA is running (though we don't expect it to be). */
1592 while (*R_DMA_CH8_SUB0_CMD & IO_MASK(R_DMA_CH8_SUB0_CMD, cmd));
1594 /* Advance the DMA to the next EP descriptor. */
1595 ep = (USB_EP_Desc_t *)phys_to_virt(*R_DMA_CH8_SUB0_EP);
1597 //dbg_bulk("descr intr: DMA is at 0x%lx", (unsigned long)ep);
1599 /* ep->next is already a physical address; no need for a virt_to_phys. */
1600 *R_DMA_CH8_SUB0_EP = ep->next;
1602 /* Start the DMA bulk channel again. */
1603 *R_DMA_CH8_SUB0_CMD = IO_STATE(R_DMA_CH8_SUB0_CMD, cmd, start);
1605 if (*R_IRQ_READ2 & IO_MASK(R_IRQ_READ2, dma8_sub1_descr)) {
1608 etrax_urb_priv_t *urb_priv;
1609 unsigned long int flags;
1611 dbg_ctrl("dma8_sub1_descr (CTRL) intr.");
1612 *R_DMA_CH8_SUB1_CLR_INTR = IO_STATE(R_DMA_CH8_SUB1_CLR_INTR, clr_descr, do);
1614 /* The complete callback gets called so we cli. */
1618 for (epid = 0; epid < NBR_OF_EPIDS - 1; epid++) {
1619 if ((TxCtrlEPList[epid].sub == 0) ||
1620 (epid == DUMMY_EPID) ||
1621 (epid == INVALID_EPID)) {
1622 /* Nothing here to see. */
1626 /* Get the first urb (if any). */
1627 urb = urb_list_first(epid);
1632 assert(usb_pipetype(urb->pipe) == PIPE_CONTROL);
1634 urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
1637 if (urb_priv->urb_state == WAITING_FOR_DESCR_INTR) {
1638 assert(!(TxCtrlEPList[urb_priv->epid].command & IO_MASK(USB_EP_command, enable)));
1640 etrax_usb_complete_urb(urb, 0);
1644 restore_flags(flags);
1646 if (*R_IRQ_READ2 & IO_MASK(R_IRQ_READ2, dma8_sub2_descr)) {
1647 dbg_intr("dma8_sub2_descr (INTR) intr.");
1648 *R_DMA_CH8_SUB2_CLR_INTR = IO_STATE(R_DMA_CH8_SUB2_CLR_INTR, clr_descr, do);
1650 if (*R_IRQ_READ2 & IO_MASK(R_IRQ_READ2, dma8_sub3_descr)) {
1654 etrax_urb_priv_t *urb_priv;
1655 USB_SB_Desc_t *sb_desc;
1657 usb_isoc_complete_data_t *comp_data = NULL;
1659 /* One or more isoc out transfers are done. */
1660 dbg_isoc("dma8_sub3_descr (ISOC) intr.");
1662 /* For each isoc out EP search for the first sb_desc with the intr flag
1663 set. This descriptor must be the last packet from an URB. Then
1664 traverse the URB list for the EP until the URB with urb_priv->last_sb
1665 matching the intr-marked sb_desc is found. All URBs before this have
1669 for (epid = 0; epid < NBR_OF_EPIDS - 1; epid++) {
1670 /* Skip past epids with no SB lists, epids used for in traffic,
1671 and special (dummy, invalid) epids. */
1672 if ((TxIsocEPList[epid].sub == 0) ||
1673 (test_bit(epid, (void *)&epid_out_traffic) == 0) ||
1674 (epid == DUMMY_EPID) ||
1675 (epid == INVALID_EPID)) {
1676 /* Nothing here to see. */
1679 sb_desc = phys_to_virt(TxIsocEPList[epid].sub);
1681 /* Find the last descriptor of the currently active URB for this ep.
1682 This is the first descriptor in the sub list marked for a descriptor
1684 while (sb_desc && !IO_EXTRACT(USB_SB_command, intr, sb_desc->command)) {
1685 sb_desc = sb_desc->next ? phys_to_virt(sb_desc->next) : 0;
1689 dbg_isoc("Check epid %d, sub 0x%p, SB 0x%p",
1691 phys_to_virt(TxIsocEPList[epid].sub),
1696 /* Get the first urb (if any). */
1697 urb = urb_list_first(epid);
1700 while (urb && !epid_done) {
1703 assert(usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS);
1705 if (!usb_pipeout(urb->pipe)) {
1706 /* descr interrupts are generated only for out pipes. */
1711 urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
1714 if (sb_desc != urb_priv->last_sb) {
1716 /* This urb has been sent. */
1717 dbg_isoc("out URB 0x%p sent", urb);
1719 urb_priv->urb_state = TRANSFER_DONE;
1721 } else if ((sb_desc == urb_priv->last_sb) &&
1722 !(TxIsocEPList[epid].command & IO_MASK(USB_EP_command, enable))) {
1724 assert((sb_desc->command & IO_MASK(USB_SB_command, eol)) == IO_STATE(USB_SB_command, eol, yes));
1725 assert(sb_desc->next == 0);
1727 dbg_isoc("out URB 0x%p last in list, epid disabled", urb);
1728 TxIsocEPList[epid].sub = 0;
1729 TxIsocEPList[epid].hw_len = 0;
1730 urb_priv->urb_state = TRANSFER_DONE;
1738 urb = urb_list_next(urb, epid);
1744 *R_DMA_CH8_SUB3_CLR_INTR = IO_STATE(R_DMA_CH8_SUB3_CLR_INTR, clr_descr, do);
1746 comp_data = (usb_isoc_complete_data_t*)kmem_cache_alloc(isoc_compl_cache, SLAB_ATOMIC);
1747 assert(comp_data != NULL);
1749 INIT_WORK(&comp_data->usb_bh, etrax_usb_isoc_descr_interrupt_bottom_half, comp_data);
1750 schedule_work(&comp_data->usb_bh);
1757 static void etrax_usb_isoc_descr_interrupt_bottom_half(void *data)
1759 usb_isoc_complete_data_t *comp_data = (usb_isoc_complete_data_t*)data;
1764 etrax_urb_priv_t *urb_priv;
1768 dbg_isoc("dma8_sub3_descr (ISOC) bottom half.");
1770 for (epid = 0; epid < NBR_OF_EPIDS - 1; epid++) {
1771 unsigned long flags;
1778 /* The descriptor interrupt handler has marked all transmitted isoch. out
1779 URBs with TRANSFER_DONE. Now we traverse all epids and for all that
1780 have isoch. out traffic traverse its URB list and complete the
1784 while (!epid_done) {
1786 /* Get the first urb (if any). */
1787 urb = urb_list_first(epid);
1793 if (usb_pipetype(urb->pipe) != PIPE_ISOCHRONOUS) {
1798 if (!usb_pipeout(urb->pipe)) {
1799 /* descr interrupts are generated only for out pipes. */
1804 dbg_isoc("Check epid %d, SB 0x%p", epid, (char*)TxIsocEPList[epid].sub);
1806 urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
1809 if (urb_priv->urb_state == TRANSFER_DONE) {
1811 struct usb_iso_packet_descriptor *packet;
1813 /* This urb has been sent. */
1814 dbg_isoc("Completing isoc out URB 0x%p", urb);
1816 for (i = 0; i < urb->number_of_packets; i++) {
1817 packet = &urb->iso_frame_desc[i];
1819 packet->actual_length = packet->length;
1822 etrax_usb_complete_isoc_urb(urb, 0);
1824 if (urb_list_empty(epid)) {
1825 etrax_usb_free_epid(epid);
1832 restore_flags(flags);
1835 kmem_cache_free(isoc_compl_cache, comp_data);
1842 static irqreturn_t etrax_usb_rx_interrupt(int irq, void *vhc, struct pt_regs *regs)
1845 etrax_urb_priv_t *urb_priv;
1847 unsigned long flags;
1849 /* Isoc diagnostics. */
1850 static int curr_fm = 0;
1851 static int prev_fm = 0;
1855 /* Clear this interrupt. */
1856 *R_DMA_CH9_CLR_INTR = IO_STATE(R_DMA_CH9_CLR_INTR, clr_eop, do);
1858 /* Note that this while loop assumes that all packets span only
1859 one rx descriptor. */
1861 /* The reason we cli here is that we call the driver's callback functions. */
1865 while (myNextRxDesc->status & IO_MASK(USB_IN_status, eop)) {
1867 epid = IO_EXTRACT(USB_IN_status, epid, myNextRxDesc->status);
1868 urb = urb_list_first(epid);
1870 //printk("eop for epid %d, first urb 0x%lx\n", epid, (unsigned long)urb);
1873 err("No urb for epid %d in rx interrupt", epid);
1874 __dump_ept_data(epid);
1878 /* Note that we cannot indescriminately assert(usb_pipein(urb->pipe)) since
1879 ctrl pipes are not. */
1881 if (myNextRxDesc->status & IO_MASK(USB_IN_status, error)) {
1882 __u32 r_usb_ept_data;
1885 assert(test_bit(epid, (void *)&epid_usage_bitmask));
1887 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
1889 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
1890 r_usb_ept_data = *R_USB_EPT_DATA_ISO;
1892 if ((r_usb_ept_data & IO_MASK(R_USB_EPT_DATA_ISO, valid)) &&
1893 (IO_EXTRACT(R_USB_EPT_DATA_ISO, error_code, r_usb_ept_data) == 0) &&
1894 (myNextRxDesc->status & IO_MASK(USB_IN_status, nodata))) {
1895 /* Not an error, just a failure to receive an expected iso
1896 in packet in this frame. This is not documented
1897 in the designers reference.
1901 warn("R_USB_EPT_DATA_ISO for epid %d = 0x%x", epid, r_usb_ept_data);
1904 r_usb_ept_data = *R_USB_EPT_DATA;
1905 warn("R_USB_EPT_DATA for epid %d = 0x%x", epid, r_usb_ept_data);
1909 warn("error in rx desc->status, epid %d, first urb = 0x%lx",
1910 epid, (unsigned long)urb);
1911 __dump_in_desc(myNextRxDesc);
1913 warn("R_USB_STATUS = 0x%x", *R_USB_STATUS);
1915 /* Check that ept was disabled when error occurred. */
1916 switch (usb_pipetype(urb->pipe)) {
1918 assert(!(TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable)));
1921 assert(!(TxCtrlEPList[epid].command & IO_MASK(USB_EP_command, enable)));
1923 case PIPE_INTERRUPT:
1924 assert(!(TxIntrEPList[epid].command & IO_MASK(USB_EP_command, enable)));
1926 case PIPE_ISOCHRONOUS:
1927 assert(!(TxIsocEPList[epid].command & IO_MASK(USB_EP_command, enable)));
1930 warn("etrax_usb_rx_interrupt: bad pipetype %d in urb 0x%p",
1931 usb_pipetype(urb->pipe),
1934 etrax_usb_complete_urb(urb, -EPROTO);
1939 urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
1942 if ((usb_pipetype(urb->pipe) == PIPE_BULK) ||
1943 (usb_pipetype(urb->pipe) == PIPE_CONTROL) ||
1944 (usb_pipetype(urb->pipe) == PIPE_INTERRUPT)) {
1946 if (myNextRxDesc->status & IO_MASK(USB_IN_status, nodata)) {
1947 /* We get nodata for empty data transactions, and the rx descriptor's
1948 hw_len field is not valid in that case. No data to copy in other
1951 /* Make sure the data fits in the buffer. */
1952 assert(urb_priv->rx_offset + myNextRxDesc->hw_len
1953 <= urb->transfer_buffer_length);
1955 memcpy(urb->transfer_buffer + urb_priv->rx_offset,
1956 phys_to_virt(myNextRxDesc->buf), myNextRxDesc->hw_len);
1957 urb_priv->rx_offset += myNextRxDesc->hw_len;
1960 if (myNextRxDesc->status & IO_MASK(USB_IN_status, eot)) {
1961 if ((usb_pipetype(urb->pipe) == PIPE_CONTROL) &&
1962 ((TxCtrlEPList[urb_priv->epid].command & IO_MASK(USB_EP_command, enable)) ==
1963 IO_STATE(USB_EP_command, enable, yes))) {
1964 /* The EP is still enabled, so the OUT packet used to ack
1965 the in data is probably not processed yet. If the EP
1966 sub pointer has not moved beyond urb_priv->last_sb mark
1967 it for a descriptor interrupt and complete the urb in
1968 the descriptor interrupt handler.
1970 USB_SB_Desc_t *sub = TxCtrlEPList[urb_priv->epid].sub ? phys_to_virt(TxCtrlEPList[urb_priv->epid].sub) : 0;
1972 while ((sub != NULL) && (sub != urb_priv->last_sb)) {
1973 sub = sub->next ? phys_to_virt(sub->next) : 0;
1976 /* The urb has not been fully processed. */
1977 urb_priv->urb_state = WAITING_FOR_DESCR_INTR;
1979 warn("(CTRL) epid enabled and urb (0x%p) processed, ep->sub=0x%p", urb, (char*)TxCtrlEPList[urb_priv->epid].sub);
1980 etrax_usb_complete_urb(urb, 0);
1983 etrax_usb_complete_urb(urb, 0);
1987 } else if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
1989 struct usb_iso_packet_descriptor *packet;
1991 if (urb_priv->urb_state == UNLINK) {
1992 info("Ignoring rx data for urb being unlinked.");
1994 } else if (urb_priv->urb_state == NOT_STARTED) {
1995 info("What? Got rx data for urb that isn't started?");
1999 packet = &urb->iso_frame_desc[urb_priv->isoc_packet_counter];
2002 if (myNextRxDesc->status & IO_MASK(USB_IN_status, nodata)) {
2003 /* We get nodata for empty data transactions, and the rx descriptor's
2004 hw_len field is not valid in that case. We copy 0 bytes however to
2006 packet->actual_length = 0;
2008 packet->actual_length = myNextRxDesc->hw_len;
2009 /* Make sure the data fits in the buffer. */
2010 assert(packet->actual_length <= packet->length);
2011 memcpy(urb->transfer_buffer + packet->offset,
2012 phys_to_virt(myNextRxDesc->buf), packet->actual_length);
2015 /* Increment the packet counter. */
2016 urb_priv->isoc_packet_counter++;
2018 /* Note that we don't care about the eot field in the rx descriptor's status.
2019 It will always be set for isoc traffic. */
2020 if (urb->number_of_packets == urb_priv->isoc_packet_counter) {
2022 /* Out-of-synch diagnostics. */
2023 curr_fm = (*R_USB_FM_NUMBER & 0x7ff);
2024 if (((prev_fm + urb_priv->isoc_packet_counter) % (0x7ff + 1)) != curr_fm) {
2025 /* This test is wrong, if there is more than one isoc
2026 in endpoint active it will always calculate wrong
2027 since prev_fm is shared by all endpoints.
2029 FIXME Make this check per URB using urb->start_frame.
2031 dbg_isoc("Out of synch? Previous frame = %d, current frame = %d",
2037 /* Complete the urb with status OK. */
2038 etrax_usb_complete_isoc_urb(urb, 0);
2044 /* DMA IN cache bug. Flush the DMA IN buffer from the cache. (struct etrax_dma_descr
2045 has the same layout as USB_IN_Desc for the relevant fields.) */
2046 prepare_rx_descriptor((struct etrax_dma_descr*)myNextRxDesc);
2048 myPrevRxDesc = myNextRxDesc;
2049 myPrevRxDesc->command |= IO_MASK(USB_IN_command, eol);
2050 myLastRxDesc->command &= ~IO_MASK(USB_IN_command, eol);
2051 myLastRxDesc = myPrevRxDesc;
2053 myNextRxDesc->status = 0;
2054 myNextRxDesc = phys_to_virt(myNextRxDesc->next);
2057 restore_flags(flags);
2065 /* This function will unlink the SB descriptors associated with this urb. */
2066 static int etrax_remove_from_sb_list(struct urb *urb)
2068 USB_SB_Desc_t *next_sb, *first_sb, *last_sb;
2069 etrax_urb_priv_t *urb_priv;
2074 urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
2077 /* Just a sanity check. Since we don't fiddle with the DMA list the EP descriptor
2078 doesn't really need to be disabled, it's just that we expect it to be. */
2079 if (usb_pipetype(urb->pipe) == PIPE_BULK) {
2080 assert(!(TxBulkEPList[urb_priv->epid].command & IO_MASK(USB_EP_command, enable)));
2081 } else if (usb_pipetype(urb->pipe) == PIPE_CONTROL) {
2082 assert(!(TxCtrlEPList[urb_priv->epid].command & IO_MASK(USB_EP_command, enable)));
2085 first_sb = urb_priv->first_sb;
2086 last_sb = urb_priv->last_sb;
2091 while (first_sb != last_sb) {
2092 next_sb = (USB_SB_Desc_t *)phys_to_virt(first_sb->next);
2093 kmem_cache_free(usb_desc_cache, first_sb);
2097 kmem_cache_free(usb_desc_cache, last_sb);
2099 dbg_sb("%d SB descriptors freed", i);
2100 /* Compare i with urb->number_of_packets for Isoc traffic.
2101 Should be same when calling unlink_urb */
2108 static int etrax_usb_submit_bulk_urb(struct urb *urb)
2112 unsigned long flags;
2113 etrax_urb_priv_t *urb_priv;
2117 /* Epid allocation, empty check and list add must be protected.
2118 Read about this in etrax_usb_submit_ctrl_urb. */
2120 spin_lock_irqsave(&urb_list_lock, flags);
2121 epid = etrax_usb_setup_epid(urb);
2124 spin_unlock_irqrestore(&urb_list_lock, flags);
2127 empty = urb_list_empty(epid);
2128 urb_list_add(urb, epid);
2129 spin_unlock_irqrestore(&urb_list_lock, flags);
2131 dbg_bulk("Adding bulk %s urb 0x%lx to %s list, epid %d",
2132 usb_pipein(urb->pipe) ? "IN" : "OUT", (unsigned long)urb, empty ? "empty" : "", epid);
2134 /* Mark the urb as being in progress. */
2135 urb->status = -EINPROGRESS;
2137 /* Setup the hcpriv data. */
2138 urb_priv = kzalloc(sizeof(etrax_urb_priv_t), KMALLOC_FLAG);
2139 assert(urb_priv != NULL);
2140 /* This sets rx_offset to 0. */
2141 urb_priv->urb_state = NOT_STARTED;
2142 urb->hcpriv = urb_priv;
2145 etrax_usb_add_to_bulk_sb_list(urb, epid);
2153 static void etrax_usb_add_to_bulk_sb_list(struct urb *urb, int epid)
2155 USB_SB_Desc_t *sb_desc;
2156 etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
2157 unsigned long flags;
2162 dbg_bulk("etrax_usb_add_to_bulk_sb_list, urb 0x%lx", (unsigned long)urb);
2164 maxlen = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
2166 sb_desc = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_FLAG);
2167 assert(sb_desc != NULL);
2168 memset(sb_desc, 0, sizeof(USB_SB_Desc_t));
2171 if (usb_pipeout(urb->pipe)) {
2173 dbg_bulk("Grabbing bulk OUT, urb 0x%lx, epid %d", (unsigned long)urb, epid);
2175 /* This is probably a sanity check of the bulk transaction length
2176 not being larger than 64 kB. */
2177 if (urb->transfer_buffer_length > 0xffff) {
2178 panic("urb->transfer_buffer_length > 0xffff");
2181 sb_desc->sw_len = urb->transfer_buffer_length;
2183 /* The rem field is don't care if it's not a full-length transfer, so setting
2184 it shouldn't hurt. Also, rem isn't used for OUT traffic. */
2185 sb_desc->command = (IO_FIELD(USB_SB_command, rem, 0) |
2186 IO_STATE(USB_SB_command, tt, out) |
2187 IO_STATE(USB_SB_command, eot, yes) |
2188 IO_STATE(USB_SB_command, eol, yes));
2190 /* The full field is set to yes, even if we don't actually check that this is
2191 a full-length transfer (i.e., that transfer_buffer_length % maxlen = 0).
2192 Setting full prevents the USB controller from sending an empty packet in
2193 that case. However, if URB_ZERO_PACKET was set we want that. */
2194 if (!(urb->transfer_flags & URB_ZERO_PACKET)) {
2195 sb_desc->command |= IO_STATE(USB_SB_command, full, yes);
2198 sb_desc->buf = virt_to_phys(urb->transfer_buffer);
2201 } else if (usb_pipein(urb->pipe)) {
2203 dbg_bulk("Grabbing bulk IN, urb 0x%lx, epid %d", (unsigned long)urb, epid);
2205 sb_desc->sw_len = urb->transfer_buffer_length ?
2206 (urb->transfer_buffer_length - 1) / maxlen + 1 : 0;
2208 /* The rem field is don't care if it's not a full-length transfer, so setting
2209 it shouldn't hurt. */
2211 (IO_FIELD(USB_SB_command, rem,
2212 urb->transfer_buffer_length % maxlen) |
2213 IO_STATE(USB_SB_command, tt, in) |
2214 IO_STATE(USB_SB_command, eot, yes) |
2215 IO_STATE(USB_SB_command, eol, yes));
2221 urb_priv->first_sb = sb_desc;
2222 urb_priv->last_sb = sb_desc;
2223 urb_priv->epid = epid;
2225 urb->hcpriv = urb_priv;
2227 /* Reset toggle bits and reset error count. */
2231 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
2234 /* FIXME: Is this a special case since the hold field is checked,
2235 or should we check hold in a lot of other cases as well? */
2236 if (*R_USB_EPT_DATA & IO_MASK(R_USB_EPT_DATA, hold)) {
2237 panic("Hold was set in %s", __FUNCTION__);
2240 /* Reset error counters (regardless of which direction this traffic is). */
2242 ~(IO_MASK(R_USB_EPT_DATA, error_count_in) |
2243 IO_MASK(R_USB_EPT_DATA, error_count_out));
2245 /* Software must preset the toggle bits. */
2246 if (usb_pipeout(urb->pipe)) {
2248 usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe), usb_pipeout(urb->pipe));
2249 *R_USB_EPT_DATA &= ~IO_MASK(R_USB_EPT_DATA, t_out);
2250 *R_USB_EPT_DATA |= IO_FIELD(R_USB_EPT_DATA, t_out, toggle);
2253 usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe), usb_pipeout(urb->pipe));
2254 *R_USB_EPT_DATA &= ~IO_MASK(R_USB_EPT_DATA, t_in);
2255 *R_USB_EPT_DATA |= IO_FIELD(R_USB_EPT_DATA, t_in, toggle);
2258 /* Assert that the EP descriptor is disabled. */
2259 assert(!(TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable)));
2261 /* The reason we set the EP's sub pointer directly instead of
2262 walking the SB list and linking it last in the list is that we only
2263 have one active urb at a time (the rest are queued). */
2265 /* Note that we cannot have interrupts running when we have set the SB descriptor
2266 but the EP is not yet enabled. If a bulk eot happens for another EP, we will
2267 find this EP disabled and with a SB != 0, which will make us think that it's done. */
2268 TxBulkEPList[epid].sub = virt_to_phys(sb_desc);
2269 TxBulkEPList[epid].hw_len = 0;
2270 /* Note that we don't have to fill in the ep_id field since this
2271 was done when we allocated the EP descriptors in init_tx_bulk_ep. */
2273 /* Check if the dummy list is already with us (if several urbs were queued). */
2274 if (TxBulkEPList[epid].next != virt_to_phys(&TxBulkDummyEPList[epid][0])) {
2276 dbg_bulk("Inviting dummy list to the party for urb 0x%lx, epid %d",
2277 (unsigned long)urb, epid);
2279 /* The last EP in the dummy list already has its next pointer set to
2280 TxBulkEPList[epid].next. */
2282 /* We don't need to check if the DMA is at this EP or not before changing the
2283 next pointer, since we will do it in one 32-bit write (EP descriptors are
2285 TxBulkEPList[epid].next = virt_to_phys(&TxBulkDummyEPList[epid][0]);
2287 /* Enable the EP descr. */
2288 dbg_bulk("Enabling bulk EP for urb 0x%lx, epid %d", (unsigned long)urb, epid);
2289 TxBulkEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes);
2291 /* Everything is set up, safe to enable interrupts again. */
2292 restore_flags(flags);
2294 /* If the DMA bulk channel isn't running, we need to restart it if it
2295 has stopped at the last EP descriptor (DMA stopped because there was
2296 no more traffic) or if it has stopped at a dummy EP with the intr flag
2297 set (DMA stopped because we were too slow in inserting new traffic). */
2298 if (!(*R_DMA_CH8_SUB0_CMD & IO_MASK(R_DMA_CH8_SUB0_CMD, cmd))) {
2301 ep = (USB_EP_Desc_t *)phys_to_virt(*R_DMA_CH8_SUB0_EP);
2302 dbg_bulk("DMA channel not running in add");
2303 dbg_bulk("DMA is at 0x%lx", (unsigned long)ep);
2305 if (*R_DMA_CH8_SUB0_EP == virt_to_phys(&TxBulkEPList[NBR_OF_EPIDS - 1]) ||
2306 (ep->command & 0x8) >> 3) {
2307 *R_DMA_CH8_SUB0_CMD = IO_STATE(R_DMA_CH8_SUB0_CMD, cmd, start);
2308 /* Update/restart the bulk start timer since we just started the channel. */
2309 mod_timer(&bulk_start_timer, jiffies + BULK_START_TIMER_INTERVAL);
2310 /* Update/restart the bulk eot timer since we just inserted traffic. */
2311 mod_timer(&bulk_eot_timer, jiffies + BULK_EOT_TIMER_INTERVAL);
2318 static void etrax_usb_complete_bulk_urb(struct urb *urb, int status)
2320 etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
2321 int epid = urb_priv->epid;
2322 unsigned long flags;
2327 warn("Completing bulk urb with status %d.", status);
2329 dbg_bulk("Completing bulk urb 0x%lx for epid %d", (unsigned long)urb, epid);
2331 /* Update the urb list. */
2332 urb_list_del(urb, epid);
2334 /* For an IN pipe, we always set the actual length, regardless of whether there was
2335 an error or not (which means the device driver can use the data if it wants to). */
2336 if (usb_pipein(urb->pipe)) {
2337 urb->actual_length = urb_priv->rx_offset;
2339 /* Set actual_length for OUT urbs also; the USB mass storage driver seems
2340 to want that. We wouldn't know of any partial writes if there was an error. */
2342 urb->actual_length = urb->transfer_buffer_length;
2344 urb->actual_length = 0;
2348 /* FIXME: Is there something of the things below we shouldn't do if there was an error?
2349 Like, maybe we shouldn't toggle the toggle bits, or maybe we shouldn't insert more traffic. */
2354 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
2357 /* We need to fiddle with the toggle bits because the hardware doesn't do it for us. */
2358 if (usb_pipeout(urb->pipe)) {
2360 IO_EXTRACT(R_USB_EPT_DATA, t_out, *R_USB_EPT_DATA);
2361 usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
2362 usb_pipeout(urb->pipe), toggle);
2365 IO_EXTRACT(R_USB_EPT_DATA, t_in, *R_USB_EPT_DATA);
2366 usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
2367 usb_pipeout(urb->pipe), toggle);
2369 restore_flags(flags);
2371 /* Remember to free the SBs. */
2372 etrax_remove_from_sb_list(urb);
2376 /* If there are any more urb's in the list we'd better start sending */
2377 if (!urb_list_empty(epid)) {
2379 struct urb *new_urb;
2381 /* Get the first urb. */
2382 new_urb = urb_list_first(epid);
2385 dbg_bulk("More bulk for epid %d", epid);
2387 etrax_usb_add_to_bulk_sb_list(new_urb, epid);
2390 urb->status = status;
2392 /* We let any non-zero status from the layer above have precedence. */
2394 /* URB_SHORT_NOT_OK means that short reads (shorter than the endpoint's max length)
2395 is to be treated as an error. */
2396 if (urb->transfer_flags & URB_SHORT_NOT_OK) {
2397 if (usb_pipein(urb->pipe) &&
2398 (urb->actual_length !=
2399 usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe)))) {
2400 urb->status = -EREMOTEIO;
2405 if (urb->complete) {
2406 urb->complete(urb, NULL);
2409 if (urb_list_empty(epid)) {
2410 /* This means that this EP is now free, deconfigure it. */
2411 etrax_usb_free_epid(epid);
2413 /* No more traffic; time to clean up.
2414 Must set sub pointer to 0, since we look at the sub pointer when handling
2415 the bulk eot interrupt. */
2417 dbg_bulk("No bulk for epid %d", epid);
2419 TxBulkEPList[epid].sub = 0;
2421 /* Unlink the dummy list. */
2423 dbg_bulk("Kicking dummy list out of party for urb 0x%lx, epid %d",
2424 (unsigned long)urb, epid);
2426 /* No need to wait for the DMA before changing the next pointer.
2427 The modulo NBR_OF_EPIDS isn't actually necessary, since we will never use
2428 the last one (INVALID_EPID) for actual traffic. */
2429 TxBulkEPList[epid].next =
2430 virt_to_phys(&TxBulkEPList[(epid + 1) % NBR_OF_EPIDS]);
2436 static int etrax_usb_submit_ctrl_urb(struct urb *urb)
2440 unsigned long flags;
2441 etrax_urb_priv_t *urb_priv;
2445 /* FIXME: Return -ENXIO if there is already a queued urb for this endpoint? */
2447 /* Epid allocation, empty check and list add must be protected.
2449 Epid allocation because if we find an existing epid for this endpoint an urb might be
2450 completed (emptying the list) before we add the new urb to the list, causing the epid
2451 to be de-allocated. We would then start the transfer with an invalid epid -> epid attn.
2453 Empty check and add because otherwise we might conclude that the list is not empty,
2454 after which it becomes empty before we add the new urb to the list, causing us not to
2455 insert the new traffic into the SB list. */
2457 spin_lock_irqsave(&urb_list_lock, flags);
2458 epid = etrax_usb_setup_epid(urb);
2460 spin_unlock_irqrestore(&urb_list_lock, flags);
2464 empty = urb_list_empty(epid);
2465 urb_list_add(urb, epid);
2466 spin_unlock_irqrestore(&urb_list_lock, flags);
2468 dbg_ctrl("Adding ctrl urb 0x%lx to %s list, epid %d",
2469 (unsigned long)urb, empty ? "empty" : "", epid);
2471 /* Mark the urb as being in progress. */
2472 urb->status = -EINPROGRESS;
2474 /* Setup the hcpriv data. */
2475 urb_priv = kzalloc(sizeof(etrax_urb_priv_t), KMALLOC_FLAG);
2476 assert(urb_priv != NULL);
2477 /* This sets rx_offset to 0. */
2478 urb_priv->urb_state = NOT_STARTED;
2479 urb->hcpriv = urb_priv;
2482 etrax_usb_add_to_ctrl_sb_list(urb, epid);
2490 static void etrax_usb_add_to_ctrl_sb_list(struct urb *urb, int epid)
2492 USB_SB_Desc_t *sb_desc_setup;
2493 USB_SB_Desc_t *sb_desc_data;
2494 USB_SB_Desc_t *sb_desc_status;
2496 etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
2498 unsigned long flags;
2503 maxlen = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
2505 sb_desc_setup = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_FLAG);
2506 assert(sb_desc_setup != NULL);
2507 sb_desc_status = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_FLAG);
2508 assert(sb_desc_status != NULL);
2510 /* Initialize the mandatory setup SB descriptor (used only in control transfers) */
2511 sb_desc_setup->sw_len = 8;
2512 sb_desc_setup->command = (IO_FIELD(USB_SB_command, rem, 0) |
2513 IO_STATE(USB_SB_command, tt, setup) |
2514 IO_STATE(USB_SB_command, full, yes) |
2515 IO_STATE(USB_SB_command, eot, yes));
2517 sb_desc_setup->buf = virt_to_phys(urb->setup_packet);
2519 if (usb_pipeout(urb->pipe)) {
2520 dbg_ctrl("Transfer for epid %d is OUT", epid);
2522 /* If this Control OUT transfer has an optional data stage we add an OUT token
2523 before the mandatory IN (status) token, hence the reordered SB list */
2525 sb_desc_setup->next = virt_to_phys(sb_desc_status);
2526 if (urb->transfer_buffer) {
2528 dbg_ctrl("This OUT transfer has an extra data stage");
2530 sb_desc_data = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_FLAG);
2531 assert(sb_desc_data != NULL);
2533 sb_desc_setup->next = virt_to_phys(sb_desc_data);
2535 sb_desc_data->sw_len = urb->transfer_buffer_length;
2536 sb_desc_data->command = (IO_STATE(USB_SB_command, tt, out) |
2537 IO_STATE(USB_SB_command, full, yes) |
2538 IO_STATE(USB_SB_command, eot, yes));
2539 sb_desc_data->buf = virt_to_phys(urb->transfer_buffer);
2540 sb_desc_data->next = virt_to_phys(sb_desc_status);
2543 sb_desc_status->sw_len = 1;
2544 sb_desc_status->command = (IO_FIELD(USB_SB_command, rem, 0) |
2545 IO_STATE(USB_SB_command, tt, in) |
2546 IO_STATE(USB_SB_command, eot, yes) |
2547 IO_STATE(USB_SB_command, intr, yes) |
2548 IO_STATE(USB_SB_command, eol, yes));
2550 sb_desc_status->buf = 0;
2551 sb_desc_status->next = 0;
2553 } else if (usb_pipein(urb->pipe)) {
2555 dbg_ctrl("Transfer for epid %d is IN", epid);
2556 dbg_ctrl("transfer_buffer_length = %d", urb->transfer_buffer_length);
2557 dbg_ctrl("rem is calculated to %d", urb->transfer_buffer_length % maxlen);
2559 sb_desc_data = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_FLAG);
2560 assert(sb_desc_data != NULL);
2562 sb_desc_setup->next = virt_to_phys(sb_desc_data);
2564 sb_desc_data->sw_len = urb->transfer_buffer_length ?
2565 (urb->transfer_buffer_length - 1) / maxlen + 1 : 0;
2566 dbg_ctrl("sw_len got %d", sb_desc_data->sw_len);
2568 sb_desc_data->command =
2569 (IO_FIELD(USB_SB_command, rem,
2570 urb->transfer_buffer_length % maxlen) |
2571 IO_STATE(USB_SB_command, tt, in) |
2572 IO_STATE(USB_SB_command, eot, yes));
2574 sb_desc_data->buf = 0;
2575 sb_desc_data->next = virt_to_phys(sb_desc_status);
2577 /* Read comment at zout_buffer declaration for an explanation to this. */
2578 sb_desc_status->sw_len = 1;
2579 sb_desc_status->command = (IO_FIELD(USB_SB_command, rem, 0) |
2580 IO_STATE(USB_SB_command, tt, zout) |
2581 IO_STATE(USB_SB_command, full, yes) |
2582 IO_STATE(USB_SB_command, eot, yes) |
2583 IO_STATE(USB_SB_command, intr, yes) |
2584 IO_STATE(USB_SB_command, eol, yes));
2586 sb_desc_status->buf = virt_to_phys(&zout_buffer[0]);
2587 sb_desc_status->next = 0;
2590 urb_priv->first_sb = sb_desc_setup;
2591 urb_priv->last_sb = sb_desc_status;
2592 urb_priv->epid = epid;
2594 urb_priv->urb_state = STARTED;
2596 /* Reset toggle bits and reset error count, remember to di and ei */
2597 /* Warning: it is possible that this locking doesn't work with bottom-halves */
2602 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
2604 if (*R_USB_EPT_DATA & IO_MASK(R_USB_EPT_DATA, hold)) {
2605 panic("Hold was set in %s", __FUNCTION__);
2609 /* FIXME: Compare with etrax_usb_add_to_bulk_sb_list where the toggle bits
2610 are set to a specific value. Why the difference? Read "Transfer and Toggle Bits
2611 in Designer's Reference, p. 8 - 11. */
2613 ~(IO_MASK(R_USB_EPT_DATA, error_count_in) |
2614 IO_MASK(R_USB_EPT_DATA, error_count_out) |
2615 IO_MASK(R_USB_EPT_DATA, t_in) |
2616 IO_MASK(R_USB_EPT_DATA, t_out));
2618 /* Since we use the rx interrupt to complete ctrl urbs, we can enable interrupts now
2619 (i.e. we don't check the sub pointer on an eot interrupt like we do for bulk traffic). */
2620 restore_flags(flags);
2622 /* Assert that the EP descriptor is disabled. */
2623 assert(!(TxCtrlEPList[epid].command & IO_MASK(USB_EP_command, enable)));
2625 /* Set up and enable the EP descriptor. */
2626 TxCtrlEPList[epid].sub = virt_to_phys(sb_desc_setup);
2627 TxCtrlEPList[epid].hw_len = 0;
2628 TxCtrlEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes);
2630 /* We start the DMA sub channel without checking if it's running or not, because:
2631 1) If it's already running, issuing the start command is a nop.
2632 2) We avoid a test-and-set race condition. */
2633 *R_DMA_CH8_SUB1_CMD = IO_STATE(R_DMA_CH8_SUB1_CMD, cmd, start);
2638 static void etrax_usb_complete_ctrl_urb(struct urb *urb, int status)
2640 etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
2641 int epid = urb_priv->epid;
2646 warn("Completing ctrl urb with status %d.", status);
2648 dbg_ctrl("Completing ctrl epid %d, urb 0x%lx", epid, (unsigned long)urb);
2650 /* Remove this urb from the list. */
2651 urb_list_del(urb, epid);
2653 /* For an IN pipe, we always set the actual length, regardless of whether there was
2654 an error or not (which means the device driver can use the data if it wants to). */
2655 if (usb_pipein(urb->pipe)) {
2656 urb->actual_length = urb_priv->rx_offset;
2659 /* FIXME: Is there something of the things below we shouldn't do if there was an error?
2660 Like, maybe we shouldn't insert more traffic. */
2662 /* Remember to free the SBs. */
2663 etrax_remove_from_sb_list(urb);
2667 /* If there are any more urbs in the list we'd better start sending. */
2668 if (!urb_list_empty(epid)) {
2669 struct urb *new_urb;
2671 /* Get the first urb. */
2672 new_urb = urb_list_first(epid);
2675 dbg_ctrl("More ctrl for epid %d, first urb = 0x%lx", epid, (unsigned long)new_urb);
2677 etrax_usb_add_to_ctrl_sb_list(new_urb, epid);
2680 urb->status = status;
2682 /* We let any non-zero status from the layer above have precedence. */
2684 /* URB_SHORT_NOT_OK means that short reads (shorter than the endpoint's max length)
2685 is to be treated as an error. */
2686 if (urb->transfer_flags & URB_SHORT_NOT_OK) {
2687 if (usb_pipein(urb->pipe) &&
2688 (urb->actual_length !=
2689 usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe)))) {
2690 urb->status = -EREMOTEIO;
2695 if (urb->complete) {
2696 urb->complete(urb, NULL);
2699 if (urb_list_empty(epid)) {
2700 /* No more traffic. Time to clean up. */
2701 etrax_usb_free_epid(epid);
2702 /* Must set sub pointer to 0. */
2703 dbg_ctrl("No ctrl for epid %d", epid);
2704 TxCtrlEPList[epid].sub = 0;
2710 static int etrax_usb_submit_intr_urb(struct urb *urb)
2717 if (usb_pipeout(urb->pipe)) {
2718 /* Unsupported transfer type.
2719 We don't support interrupt out traffic. (If we do, we can't support
2720 intervals for neither in or out traffic, but are forced to schedule all
2721 interrupt traffic in one frame.) */
2725 epid = etrax_usb_setup_epid(urb);
2731 if (!urb_list_empty(epid)) {
2732 /* There is already a queued urb for this endpoint. */
2733 etrax_usb_free_epid(epid);
2737 urb->status = -EINPROGRESS;
2739 dbg_intr("Add intr urb 0x%lx, to list, epid %d", (unsigned long)urb, epid);
2741 urb_list_add(urb, epid);
2742 etrax_usb_add_to_intr_sb_list(urb, epid);
2749 static void etrax_usb_add_to_intr_sb_list(struct urb *urb, int epid)
2752 volatile USB_EP_Desc_t *tmp_ep;
2753 volatile USB_EP_Desc_t *first_ep;
2759 etrax_urb_priv_t *urb_priv;
2763 maxlen = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
2764 interval = urb->interval;
2766 urb_priv = kzalloc(sizeof(etrax_urb_priv_t), KMALLOC_FLAG);
2767 assert(urb_priv != NULL);
2768 urb->hcpriv = urb_priv;
2770 first_ep = &TxIntrEPList[0];
2772 /* Round of the interval to 2^n, it is obvious that this code favours
2773 smaller numbers, but that is actually a good thing */
2774 /* FIXME: The "rounding error" for larger intervals will be quite
2775 large. For in traffic this shouldn't be a problem since it will only
2776 mean that we "poll" more often. */
2777 for (i = 0; interval; i++) {
2778 interval = interval >> 1;
2780 interval = 1 << (i - 1);
2782 dbg_intr("Interval rounded to %d", interval);
2787 if (tmp_ep->command & IO_MASK(USB_EP_command, eof)) {
2788 if ((i % interval) == 0) {
2789 /* Insert the traffic ep after tmp_ep */
2790 USB_EP_Desc_t *ep_desc;
2791 USB_SB_Desc_t *sb_desc;
2793 dbg_intr("Inserting EP for epid %d", epid);
2795 ep_desc = (USB_EP_Desc_t *)
2796 kmem_cache_alloc(usb_desc_cache, SLAB_FLAG);
2797 sb_desc = (USB_SB_Desc_t *)
2798 kmem_cache_alloc(usb_desc_cache, SLAB_FLAG);
2799 assert(ep_desc != NULL);
2800 CHECK_ALIGN(ep_desc);
2801 assert(sb_desc != NULL);
2803 ep_desc->sub = virt_to_phys(sb_desc);
2804 ep_desc->hw_len = 0;
2805 ep_desc->command = (IO_FIELD(USB_EP_command, epid, epid) |
2806 IO_STATE(USB_EP_command, enable, yes));
2809 /* Round upwards the number of packets of size maxlen
2810 that this SB descriptor should receive. */
2811 sb_desc->sw_len = urb->transfer_buffer_length ?
2812 (urb->transfer_buffer_length - 1) / maxlen + 1 : 0;
2816 (IO_FIELD(USB_SB_command, rem, urb->transfer_buffer_length % maxlen) |
2817 IO_STATE(USB_SB_command, tt, in) |
2818 IO_STATE(USB_SB_command, eot, yes) |
2819 IO_STATE(USB_SB_command, eol, yes));
2821 ep_desc->next = tmp_ep->next;
2822 tmp_ep->next = virt_to_phys(ep_desc);
2826 tmp_ep = (USB_EP_Desc_t *)phys_to_virt(tmp_ep->next);
2827 } while (tmp_ep != first_ep);
2830 /* Note that first_sb/last_sb doesn't apply to interrupt traffic. */
2831 urb_priv->epid = epid;
2833 /* We start the DMA sub channel without checking if it's running or not, because:
2834 1) If it's already running, issuing the start command is a nop.
2835 2) We avoid a test-and-set race condition. */
2836 *R_DMA_CH8_SUB2_CMD = IO_STATE(R_DMA_CH8_SUB2_CMD, cmd, start);
2843 static void etrax_usb_complete_intr_urb(struct urb *urb, int status)
2845 etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
2846 int epid = urb_priv->epid;
2851 warn("Completing intr urb with status %d.", status);
2853 dbg_intr("Completing intr epid %d, urb 0x%lx", epid, (unsigned long)urb);
2855 urb->status = status;
2856 urb->actual_length = urb_priv->rx_offset;
2858 dbg_intr("interrupt urb->actual_length = %d", urb->actual_length);
2860 /* We let any non-zero status from the layer above have precedence. */
2862 /* URB_SHORT_NOT_OK means that short reads (shorter than the endpoint's max length)
2863 is to be treated as an error. */
2864 if (urb->transfer_flags & URB_SHORT_NOT_OK) {
2865 if (urb->actual_length !=
2866 usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe))) {
2867 urb->status = -EREMOTEIO;
2872 /* The driver will resubmit the URB so we need to remove it first */
2873 etrax_usb_unlink_urb(urb, 0);
2874 if (urb->complete) {
2875 urb->complete(urb, NULL);
2882 static int etrax_usb_submit_isoc_urb(struct urb *urb)
2885 unsigned long flags;
2889 dbg_isoc("Submitting isoc urb = 0x%lx", (unsigned long)urb);
2891 /* Epid allocation, empty check and list add must be protected.
2892 Read about this in etrax_usb_submit_ctrl_urb. */
2894 spin_lock_irqsave(&urb_list_lock, flags);
2895 /* Is there an active epid for this urb ? */
2896 epid = etrax_usb_setup_epid(urb);
2899 spin_unlock_irqrestore(&urb_list_lock, flags);
2903 /* Ok, now we got valid endpoint, lets insert some traffic */
2905 urb->status = -EINPROGRESS;
2907 /* Find the last urb in the URB_List and add this urb after that one.
2908 Also add the traffic, that is do an etrax_usb_add_to_isoc_sb_list. This
2909 is important to make this in "real time" since isochronous traffic is
2912 dbg_isoc("Adding isoc urb to (possibly empty) list");
2913 urb_list_add(urb, epid);
2914 etrax_usb_add_to_isoc_sb_list(urb, epid);
2915 spin_unlock_irqrestore(&urb_list_lock, flags);
2922 static void etrax_usb_check_error_isoc_ep(const int epid)
2924 unsigned long int flags;
2926 __u32 r_usb_ept_data;
2928 /* We can't read R_USB_EPID_ATTN here since it would clear the iso_eof,
2929 bulk_eot and epid_attn interrupts. So we just check the status of
2930 the epid without testing if for it in R_USB_EPID_ATTN. */
2935 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
2937 /* Note that although there are separate R_USB_EPT_DATA and R_USB_EPT_DATA_ISO
2938 registers, they are located at the same address and are of the same size.
2939 In other words, this read should be ok for isoc also. */
2940 r_usb_ept_data = *R_USB_EPT_DATA;
2941 restore_flags(flags);
2943 error_code = IO_EXTRACT(R_USB_EPT_DATA_ISO, error_code, r_usb_ept_data);
2945 if (r_usb_ept_data & IO_MASK(R_USB_EPT_DATA, hold)) {
2946 warn("Hold was set for epid %d.", epid);
2950 if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA_ISO, error_code, no_error)) {
2952 /* This indicates that the SB list of the ept was completed before
2953 new data was appended to it. This is not an error, but indicates
2954 large system or USB load and could possibly cause trouble for
2955 very timing sensitive USB device drivers so we log it.
2957 info("Isoc. epid %d disabled with no error", epid);
2960 } else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA_ISO, error_code, stall)) {
2961 /* Not really a protocol error, just says that the endpoint gave
2962 a stall response. Note that error_code cannot be stall for isoc. */
2963 panic("Isoc traffic cannot stall");
2965 } else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA_ISO, error_code, bus_error)) {
2966 /* Two devices responded to a transaction request. Must be resolved
2967 by software. FIXME: Reset ports? */
2968 panic("Bus error for epid %d."
2969 " Two devices responded to transaction request",
2972 } else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA, error_code, buffer_error)) {
2973 /* DMA overrun or underrun. */
2974 warn("Buffer overrun/underrun for epid %d. DMA too busy?", epid);
2976 /* It seems that error_code = buffer_error in
2977 R_USB_EPT_DATA/R_USB_EPT_DATA_ISO and ourun = yes in R_USB_STATUS
2978 are the same error. */
2983 static void etrax_usb_add_to_isoc_sb_list(struct urb *urb, int epid)
2988 etrax_urb_priv_t *urb_priv;
2989 USB_SB_Desc_t *prev_sb_desc, *next_sb_desc, *temp_sb_desc;
2993 prev_sb_desc = next_sb_desc = temp_sb_desc = NULL;
2995 urb_priv = kzalloc(sizeof(etrax_urb_priv_t), GFP_ATOMIC);
2996 assert(urb_priv != NULL);
2998 urb->hcpriv = urb_priv;
2999 urb_priv->epid = epid;
3001 if (usb_pipeout(urb->pipe)) {
3003 if (urb->number_of_packets == 0) panic("etrax_usb_add_to_isoc_sb_list 0 packets\n");
3005 dbg_isoc("Transfer for epid %d is OUT", epid);
3006 dbg_isoc("%d packets in URB", urb->number_of_packets);
3008 /* Create one SB descriptor for each packet and link them together. */
3009 for (i = 0; i < urb->number_of_packets; i++) {
3010 if (!urb->iso_frame_desc[i].length)
3013 next_sb_desc = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_ATOMIC);
3014 assert(next_sb_desc != NULL);
3016 if (urb->iso_frame_desc[i].length > 0) {
3018 next_sb_desc->command = (IO_STATE(USB_SB_command, tt, out) |
3019 IO_STATE(USB_SB_command, eot, yes));
3021 next_sb_desc->sw_len = urb->iso_frame_desc[i].length;
3022 next_sb_desc->buf = virt_to_phys((char*)urb->transfer_buffer + urb->iso_frame_desc[i].offset);
3024 /* Check if full length transfer. */
3025 if (urb->iso_frame_desc[i].length ==
3026 usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe))) {
3027 next_sb_desc->command |= IO_STATE(USB_SB_command, full, yes);
3030 dbg_isoc("zero len packet");
3031 next_sb_desc->command = (IO_FIELD(USB_SB_command, rem, 0) |
3032 IO_STATE(USB_SB_command, tt, zout) |
3033 IO_STATE(USB_SB_command, eot, yes) |
3034 IO_STATE(USB_SB_command, full, yes));
3036 next_sb_desc->sw_len = 1;
3037 next_sb_desc->buf = virt_to_phys(&zout_buffer[0]);
3040 /* First SB descriptor that belongs to this urb */
3042 urb_priv->first_sb = next_sb_desc;
3044 prev_sb_desc->next = virt_to_phys(next_sb_desc);
3046 prev_sb_desc = next_sb_desc;
3049 next_sb_desc->command |= (IO_STATE(USB_SB_command, intr, yes) |
3050 IO_STATE(USB_SB_command, eol, yes));
3051 next_sb_desc->next = 0;
3052 urb_priv->last_sb = next_sb_desc;
3054 } else if (usb_pipein(urb->pipe)) {
3056 dbg_isoc("Transfer for epid %d is IN", epid);
3057 dbg_isoc("transfer_buffer_length = %d", urb->transfer_buffer_length);
3058 dbg_isoc("rem is calculated to %d", urb->iso_frame_desc[urb->number_of_packets - 1].length);
3060 /* Note that in descriptors for periodic traffic are not consumed. This means that
3061 the USB controller never propagates in the SB list. In other words, if there already
3062 is an SB descriptor in the list for this EP we don't have to do anything. */
3063 if (TxIsocEPList[epid].sub == 0) {
3064 dbg_isoc("Isoc traffic not already running, allocating SB");
3066 next_sb_desc = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_ATOMIC);
3067 assert(next_sb_desc != NULL);
3069 next_sb_desc->command = (IO_STATE(USB_SB_command, tt, in) |
3070 IO_STATE(USB_SB_command, eot, yes) |
3071 IO_STATE(USB_SB_command, eol, yes));
3073 next_sb_desc->next = 0;
3074 next_sb_desc->sw_len = 1; /* Actual number of packets is not relevant
3075 for periodic in traffic as long as it is more
3076 than zero. Set to 1 always. */
3077 next_sb_desc->buf = 0;
3079 /* The rem field is don't care for isoc traffic, so we don't set it. */
3081 /* Only one SB descriptor that belongs to this urb. */
3082 urb_priv->first_sb = next_sb_desc;
3083 urb_priv->last_sb = next_sb_desc;
3087 dbg_isoc("Isoc traffic already running, just setting first/last_sb");
3089 /* Each EP for isoc in will have only one SB descriptor, setup when submitting the
3090 already active urb. Note that even though we may have several first_sb/last_sb
3091 pointing at the same SB descriptor, they are freed only once (when the list has
3093 urb_priv->first_sb = phys_to_virt(TxIsocEPList[epid].sub);
3094 urb_priv->last_sb = phys_to_virt(TxIsocEPList[epid].sub);
3100 /* Find the spot to insert this urb and add it. */
3101 if (TxIsocEPList[epid].sub == 0) {
3102 /* First SB descriptor inserted in this list (in or out). */
3103 dbg_isoc("Inserting SB desc first in list");
3104 TxIsocEPList[epid].hw_len = 0;
3105 TxIsocEPList[epid].sub = virt_to_phys(urb_priv->first_sb);
3108 /* Isochronous traffic is already running, insert new traffic last (only out). */
3109 dbg_isoc("Inserting SB desc last in list");
3110 temp_sb_desc = phys_to_virt(TxIsocEPList[epid].sub);
3111 while ((temp_sb_desc->command & IO_MASK(USB_SB_command, eol)) !=
3112 IO_STATE(USB_SB_command, eol, yes)) {
3113 assert(temp_sb_desc->next);
3114 temp_sb_desc = phys_to_virt(temp_sb_desc->next);
3116 dbg_isoc("Appending list on desc 0x%p", temp_sb_desc);
3118 /* Next pointer must be set before eol is removed. */
3119 temp_sb_desc->next = virt_to_phys(urb_priv->first_sb);
3120 /* Clear the previous end of list flag since there is a new in the
3121 added SB descriptor list. */
3122 temp_sb_desc->command &= ~IO_MASK(USB_SB_command, eol);
3124 if (!(TxIsocEPList[epid].command & IO_MASK(USB_EP_command, enable))) {
3125 /* 8.8.5 in Designer's Reference says we should check for and correct
3126 any errors in the EP here. That should not be necessary if epid_attn
3127 is handled correctly, so we assume all is ok. */
3128 dbg_isoc("EP disabled");
3129 etrax_usb_check_error_isoc_ep(epid);
3131 /* The SB list was exhausted. */
3132 if (virt_to_phys(urb_priv->last_sb) != TxIsocEPList[epid].sub) {
3133 /* The new sublist did not get processed before the EP was
3134 disabled. Setup the EP again. */
3135 dbg_isoc("Set EP sub to new list");
3136 TxIsocEPList[epid].hw_len = 0;
3137 TxIsocEPList[epid].sub = virt_to_phys(urb_priv->first_sb);
3142 if (urb->transfer_flags & URB_ISO_ASAP) {
3143 /* The isoc transfer should be started as soon as possible. The start_frame
3144 field is a return value if URB_ISO_ASAP was set. Comparing R_USB_FM_NUMBER
3145 with a USB Chief trace shows that the first isoc IN token is sent 2 frames
3146 later. I'm not sure how this affects usage of the start_frame field by the
3147 device driver, or how it affects things when USB_ISO_ASAP is not set, so
3148 therefore there's no compensation for the 2 frame "lag" here. */
3149 urb->start_frame = (*R_USB_FM_NUMBER & 0x7ff);
3150 TxIsocEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes);
3151 urb_priv->urb_state = STARTED;
3152 dbg_isoc("URB_ISO_ASAP set, urb->start_frame set to %d", urb->start_frame);
3154 /* Not started yet. */
3155 urb_priv->urb_state = NOT_STARTED;
3156 dbg_isoc("urb_priv->urb_state set to NOT_STARTED");
3159 /* We start the DMA sub channel without checking if it's running or not, because:
3160 1) If it's already running, issuing the start command is a nop.
3161 2) We avoid a test-and-set race condition. */
3162 *R_DMA_CH8_SUB3_CMD = IO_STATE(R_DMA_CH8_SUB3_CMD, cmd, start);
3167 static void etrax_usb_complete_isoc_urb(struct urb *urb, int status)
3169 etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
3170 int epid = urb_priv->epid;
3171 int auto_resubmit = 0;
3174 dbg_isoc("complete urb 0x%p, status %d", urb, status);
3177 warn("Completing isoc urb with status %d.", status);
3179 if (usb_pipein(urb->pipe)) {
3182 /* Make that all isoc packets have status and length set before
3183 completing the urb. */
3184 for (i = urb_priv->isoc_packet_counter; i < urb->number_of_packets; i++) {
3185 urb->iso_frame_desc[i].actual_length = 0;
3186 urb->iso_frame_desc[i].status = -EPROTO;
3189 urb_list_del(urb, epid);
3191 if (!list_empty(&urb_list[epid])) {
3192 ((etrax_urb_priv_t *)(urb_list_first(epid)->hcpriv))->urb_state = STARTED;
3194 unsigned long int flags;
3195 if (TxIsocEPList[epid].command & IO_MASK(USB_EP_command, enable)) {
3196 /* The EP was enabled, disable it and wait. */
3197 TxIsocEPList[epid].command &= ~IO_MASK(USB_EP_command, enable);
3199 /* Ah, the luxury of busy-wait. */
3200 while (*R_DMA_CH8_SUB3_EP == virt_to_phys(&TxIsocEPList[epid]));
3203 etrax_remove_from_sb_list(urb);
3204 TxIsocEPList[epid].sub = 0;
3205 TxIsocEPList[epid].hw_len = 0;
3209 etrax_usb_free_epid(epid);
3210 restore_flags(flags);
3216 /* Release allocated bandwidth. */
3217 usb_release_bandwidth(urb->dev, urb, 0);
3218 } else if (usb_pipeout(urb->pipe)) {
3221 dbg_isoc("Isoc out urb complete 0x%p", urb);
3223 /* Update the urb list. */
3224 urb_list_del(urb, epid);
3226 freed_descr = etrax_remove_from_sb_list(urb);
3227 dbg_isoc("freed %d descriptors of %d packets", freed_descr, urb->number_of_packets);
3228 assert(freed_descr == urb->number_of_packets);
3232 /* Release allocated bandwidth. */
3233 usb_release_bandwidth(urb->dev, urb, 0);
3236 urb->status = status;
3237 if (urb->complete) {
3238 urb->complete(urb, NULL);
3241 if (auto_resubmit) {
3242 /* Check that urb was not unlinked by the complete callback. */
3243 if (__urb_list_entry(urb, epid)) {
3244 /* Move this one down the list. */
3245 urb_list_move_last(urb, epid);
3247 /* Mark the now first urb as started (may already be). */
3248 ((etrax_urb_priv_t *)(urb_list_first(epid)->hcpriv))->urb_state = STARTED;
3250 /* Must set this to 0 since this urb is still active after
3252 urb_priv->isoc_packet_counter = 0;
3254 warn("(ISOC) automatic resubmit urb 0x%p removed by complete.", urb);
3261 static void etrax_usb_complete_urb(struct urb *urb, int status)
3263 switch (usb_pipetype(urb->pipe)) {
3265 etrax_usb_complete_bulk_urb(urb, status);
3268 etrax_usb_complete_ctrl_urb(urb, status);
3270 case PIPE_INTERRUPT:
3271 etrax_usb_complete_intr_urb(urb, status);
3273 case PIPE_ISOCHRONOUS:
3274 etrax_usb_complete_isoc_urb(urb, status);
3277 err("Unknown pipetype");
3283 static irqreturn_t etrax_usb_hc_interrupt_top_half(int irq, void *vhc, struct pt_regs *regs)
3285 usb_interrupt_registers_t *reg;
3286 unsigned long flags;
3290 __u16 port_status_1;
3291 __u16 port_status_2;
3296 /* Read critical registers into local variables, do kmalloc afterwards. */
3300 irq_mask = *R_USB_IRQ_MASK_READ;
3301 /* Reading R_USB_STATUS clears the ctl_status interrupt. Note that R_USB_STATUS
3302 must be read before R_USB_EPID_ATTN since reading the latter clears the
3303 ourun and perror fields of R_USB_STATUS. */
3304 status = *R_USB_STATUS;
3306 /* Reading R_USB_EPID_ATTN clears the iso_eof, bulk_eot and epid_attn interrupts. */
3307 epid_attn = *R_USB_EPID_ATTN;
3309 /* Reading R_USB_RH_PORT_STATUS_1 and R_USB_RH_PORT_STATUS_2 clears the
3310 port_status interrupt. */
3311 port_status_1 = *R_USB_RH_PORT_STATUS_1;
3312 port_status_2 = *R_USB_RH_PORT_STATUS_2;
3314 /* Reading R_USB_FM_NUMBER clears the sof interrupt. */
3315 /* Note: the lower 11 bits contain the actual frame number, sent with each sof. */
3316 fm_number = *R_USB_FM_NUMBER;
3318 restore_flags(flags);
3320 reg = (usb_interrupt_registers_t *)kmem_cache_alloc(top_half_reg_cache, SLAB_ATOMIC);
3322 assert(reg != NULL);
3324 reg->hc = (etrax_hc_t *)vhc;
3326 /* Now put register values into kmalloc'd area. */
3327 reg->r_usb_irq_mask_read = irq_mask;
3328 reg->r_usb_status = status;
3329 reg->r_usb_epid_attn = epid_attn;
3330 reg->r_usb_rh_port_status_1 = port_status_1;
3331 reg->r_usb_rh_port_status_2 = port_status_2;
3332 reg->r_usb_fm_number = fm_number;
3334 INIT_WORK(®->usb_bh, etrax_usb_hc_interrupt_bottom_half, reg);
3335 schedule_work(®->usb_bh);
3342 static void etrax_usb_hc_interrupt_bottom_half(void *data)
3344 usb_interrupt_registers_t *reg = (usb_interrupt_registers_t *)data;
3345 __u32 irq_mask = reg->r_usb_irq_mask_read;
3349 /* Interrupts are handled in order of priority. */
3350 if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, epid_attn)) {
3351 etrax_usb_hc_epid_attn_interrupt(reg);
3353 if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, port_status)) {
3354 etrax_usb_hc_port_status_interrupt(reg);
3356 if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, ctl_status)) {
3357 etrax_usb_hc_ctl_status_interrupt(reg);
3359 if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, iso_eof)) {
3360 etrax_usb_hc_isoc_eof_interrupt();
3362 if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, bulk_eot)) {
3363 /* Update/restart the bulk start timer since obviously the channel is running. */
3364 mod_timer(&bulk_start_timer, jiffies + BULK_START_TIMER_INTERVAL);
3365 /* Update/restart the bulk eot timer since we just received an bulk eot interrupt. */
3366 mod_timer(&bulk_eot_timer, jiffies + BULK_EOT_TIMER_INTERVAL);
3368 etrax_usb_hc_bulk_eot_interrupt(0);
3371 kmem_cache_free(top_half_reg_cache, reg);
3377 void etrax_usb_hc_isoc_eof_interrupt(void)
3380 etrax_urb_priv_t *urb_priv;
3382 unsigned long flags;
3386 /* Do not check the invalid epid (it has a valid sub pointer). */
3387 for (epid = 0; epid < NBR_OF_EPIDS - 1; epid++) {
3389 /* Do not check the invalid epid (it has a valid sub pointer). */
3390 if ((epid == DUMMY_EPID) || (epid == INVALID_EPID))
3393 /* Disable interrupts to block the isoc out descriptor interrupt handler
3394 from being called while the isoc EPID list is being checked.
3399 if (TxIsocEPList[epid].sub == 0) {
3400 /* Nothing here to see. */
3401 restore_flags(flags);
3405 /* Get the first urb (if any). */
3406 urb = urb_list_first(epid);
3408 warn("Ignoring NULL urb");
3409 restore_flags(flags);
3412 if (usb_pipein(urb->pipe)) {
3415 assert(usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS);
3417 urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
3420 if (urb_priv->urb_state == NOT_STARTED) {
3422 /* If ASAP is not set and urb->start_frame is the current frame,
3423 start the transfer. */
3424 if (!(urb->transfer_flags & URB_ISO_ASAP) &&
3425 (urb->start_frame == (*R_USB_FM_NUMBER & 0x7ff))) {
3427 dbg_isoc("Enabling isoc IN EP descr for epid %d", epid);
3428 TxIsocEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes);
3430 /* This urb is now active. */
3431 urb_priv->urb_state = STARTED;
3436 restore_flags(flags);
3443 void etrax_usb_hc_bulk_eot_interrupt(int timer_induced)
3447 /* The technique is to run one urb at a time, wait for the eot interrupt at which
3448 point the EP descriptor has been disabled. */
3451 dbg_bulk("bulk eot%s", timer_induced ? ", called by timer" : "");
3453 for (epid = 0; epid < NBR_OF_EPIDS; epid++) {
3455 if (!(TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable)) &&
3456 (TxBulkEPList[epid].sub != 0)) {
3459 etrax_urb_priv_t *urb_priv;
3460 unsigned long flags;
3461 __u32 r_usb_ept_data;
3463 /* Found a disabled EP descriptor which has a non-null sub pointer.
3464 Verify that this ctrl EP descriptor got disabled no errors.
3465 FIXME: Necessary to check error_code? */
3466 dbg_bulk("for epid %d?", epid);
3468 /* Get the first urb. */
3469 urb = urb_list_first(epid);
3471 /* FIXME: Could this happen for valid reasons? Why did it disappear? Because of
3474 warn("NULL urb for epid %d", epid);
3479 urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
3482 /* Sanity checks. */
3483 assert(usb_pipetype(urb->pipe) == PIPE_BULK);
3484 if (phys_to_virt(TxBulkEPList[epid].sub) != urb_priv->last_sb) {
3485 err("bulk endpoint got disabled before reaching last sb");
3488 /* For bulk IN traffic, there seems to be a race condition between
3489 between the bulk eot and eop interrupts, or rather an uncertainty regarding
3490 the order in which they happen. Normally we expect the eop interrupt from
3491 DMA channel 9 to happen before the eot interrupt.
3493 Therefore, we complete the bulk IN urb in the rx interrupt handler instead. */
3495 if (usb_pipein(urb->pipe)) {
3496 dbg_bulk("in urb, continuing");
3502 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
3504 r_usb_ept_data = *R_USB_EPT_DATA;
3505 restore_flags(flags);
3507 if (IO_EXTRACT(R_USB_EPT_DATA, error_code, r_usb_ept_data) ==
3508 IO_STATE_VALUE(R_USB_EPT_DATA, error_code, no_error)) {
3509 /* This means that the endpoint has no error, is disabled
3510 and had inserted traffic, i.e. transfer successfully completed. */
3511 etrax_usb_complete_bulk_urb(urb, 0);
3513 /* Shouldn't happen. We expect errors to be caught by epid attention. */
3514 err("Found disabled bulk EP desc, error_code != no_error");
3519 /* Normally, we should find (at least) one disabled EP descriptor with a valid sub pointer.
3520 However, because of the uncertainty in the deliverance of the eop/eot interrupts, we may
3521 not. Also, we might find two disabled EPs when handling an eot interrupt, and then find
3522 none the next time. */
3528 void etrax_usb_hc_epid_attn_interrupt(usb_interrupt_registers_t *reg)
3530 /* This function handles the epid attention interrupt. There are a variety of reasons
3531 for this interrupt to happen (Designer's Reference, p. 8 - 22 for the details):
3533 invalid ep_id - Invalid epid in an EP (EP disabled).
3534 stall - Not strictly an error condition (EP disabled).
3535 3rd error - Three successive transaction errors (EP disabled).
3536 buffer ourun - Buffer overrun or underrun (EP disabled).
3537 past eof1 - Intr or isoc transaction proceeds past EOF1.
3538 near eof - Intr or isoc transaction would not fit inside the frame.
3539 zout transfer - If zout transfer for a bulk endpoint (EP disabled).
3540 setup transfer - If setup transfer for a non-ctrl endpoint (EP disabled). */
3547 assert(reg != NULL);
3549 /* Note that we loop through all epids. We still want to catch errors for
3550 the invalid one, even though we might handle them differently. */
3551 for (epid = 0; epid < NBR_OF_EPIDS; epid++) {
3553 if (test_bit(epid, (void *)®->r_usb_epid_attn)) {
3556 __u32 r_usb_ept_data;
3557 unsigned long flags;
3562 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
3564 /* Note that although there are separate R_USB_EPT_DATA and R_USB_EPT_DATA_ISO
3565 registers, they are located at the same address and are of the same size.
3566 In other words, this read should be ok for isoc also. */
3567 r_usb_ept_data = *R_USB_EPT_DATA;
3568 restore_flags(flags);
3570 /* First some sanity checks. */
3571 if (epid == INVALID_EPID) {
3572 /* FIXME: What if it became disabled? Could seriously hurt interrupt
3573 traffic. (Use do_intr_recover.) */
3574 warn("Got epid_attn for INVALID_EPID (%d).", epid);
3575 err("R_USB_EPT_DATA = 0x%x", r_usb_ept_data);
3576 err("R_USB_STATUS = 0x%x", reg->r_usb_status);
3578 } else if (epid == DUMMY_EPID) {
3579 /* We definitely don't care about these ones. Besides, they are
3580 always disabled, so any possible disabling caused by the
3581 epid attention interrupt is irrelevant. */
3582 warn("Got epid_attn for DUMMY_EPID (%d).", epid);
3586 /* Get the first urb in the urb list for this epid. We blatantly assume
3587 that only the first urb could have caused the epid attention.
3588 (For bulk and ctrl, only one urb is active at any one time. For intr
3589 and isoc we remove them once they are completed.) */
3590 urb = urb_list_first(epid);
3593 err("Got epid_attn for epid %i with no urb.", epid);
3594 err("R_USB_EPT_DATA = 0x%x", r_usb_ept_data);
3595 err("R_USB_STATUS = 0x%x", reg->r_usb_status);
3599 switch (usb_pipetype(urb->pipe)) {
3601 warn("Got epid attn for bulk endpoint, epid %d", epid);
3604 warn("Got epid attn for control endpoint, epid %d", epid);
3606 case PIPE_INTERRUPT:
3607 warn("Got epid attn for interrupt endpoint, epid %d", epid);
3609 case PIPE_ISOCHRONOUS:
3610 warn("Got epid attn for isochronous endpoint, epid %d", epid);
3614 if (usb_pipetype(urb->pipe) != PIPE_ISOCHRONOUS) {
3615 if (r_usb_ept_data & IO_MASK(R_USB_EPT_DATA, hold)) {
3616 warn("Hold was set for epid %d.", epid);
3621 /* Even though error_code occupies bits 22 - 23 in both R_USB_EPT_DATA and
3622 R_USB_EPT_DATA_ISOC, we separate them here so we don't forget in other places. */
3623 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
3624 error_code = IO_EXTRACT(R_USB_EPT_DATA_ISO, error_code, r_usb_ept_data);
3626 error_code = IO_EXTRACT(R_USB_EPT_DATA, error_code, r_usb_ept_data);
3629 /* Using IO_STATE_VALUE on R_USB_EPT_DATA should be ok for isoc also. */
3630 if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA, error_code, no_error)) {
3632 /* Isoc traffic doesn't have error_count_in/error_count_out. */
3633 if ((usb_pipetype(urb->pipe) != PIPE_ISOCHRONOUS) &&
3634 (IO_EXTRACT(R_USB_EPT_DATA, error_count_in, r_usb_ept_data) == 3 ||
3635 IO_EXTRACT(R_USB_EPT_DATA, error_count_out, r_usb_ept_data) == 3)) {
3637 warn("3rd error for epid %i", epid);
3638 etrax_usb_complete_urb(urb, -EPROTO);
3640 } else if (reg->r_usb_status & IO_MASK(R_USB_STATUS, perror)) {
3642 warn("Perror for epid %d", epid);
3644 if (!(r_usb_ept_data & IO_MASK(R_USB_EPT_DATA, valid))) {
3646 panic("Perror because of invalid epid."
3647 " Deconfigured too early?");
3649 /* past eof1, near eof, zout transfer, setup transfer */
3651 /* Dump the urb and the relevant EP descriptor list. */
3654 __dump_ept_data(epid);
3655 __dump_ep_list(usb_pipetype(urb->pipe));
3657 panic("Something wrong with DMA descriptor contents."
3658 " Too much traffic inserted?");
3660 } else if (reg->r_usb_status & IO_MASK(R_USB_STATUS, ourun)) {
3662 panic("Buffer overrun/underrun for epid %d. DMA too busy?", epid);
3665 } else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA, error_code, stall)) {
3666 /* Not really a protocol error, just says that the endpoint gave
3667 a stall response. Note that error_code cannot be stall for isoc. */
3668 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
3669 panic("Isoc traffic cannot stall");
3672 warn("Stall for epid %d", epid);
3673 etrax_usb_complete_urb(urb, -EPIPE);
3675 } else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA, error_code, bus_error)) {
3676 /* Two devices responded to a transaction request. Must be resolved
3677 by software. FIXME: Reset ports? */
3678 panic("Bus error for epid %d."
3679 " Two devices responded to transaction request",
3682 } else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA, error_code, buffer_error)) {
3683 /* DMA overrun or underrun. */
3684 warn("Buffer overrun/underrun for epid %d. DMA too busy?", epid);
3686 /* It seems that error_code = buffer_error in
3687 R_USB_EPT_DATA/R_USB_EPT_DATA_ISO and ourun = yes in R_USB_STATUS
3688 are the same error. */
3689 etrax_usb_complete_urb(urb, -EPROTO);
3698 void etrax_usb_bulk_start_timer_func(unsigned long dummy)
3701 /* We might enable an EP descriptor behind the current DMA position when it's about
3702 to decide that there are no more bulk traffic and it should stop the bulk channel.
3703 Therefore we periodically check if the bulk channel is stopped and there is an
3704 enabled bulk EP descriptor, in which case we start the bulk channel. */
3705 dbg_bulk("bulk_start_timer timed out.");
3707 if (!(*R_DMA_CH8_SUB0_CMD & IO_MASK(R_DMA_CH8_SUB0_CMD, cmd))) {
3710 dbg_bulk("Bulk DMA channel not running.");
3712 for (epid = 0; epid < NBR_OF_EPIDS; epid++) {
3713 if (TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable)) {
3714 dbg_bulk("Found enabled EP for epid %d, starting bulk channel.\n",
3716 *R_DMA_CH8_SUB0_CMD = IO_STATE(R_DMA_CH8_SUB0_CMD, cmd, start);
3718 /* Restart the bulk eot timer since we just started the bulk channel. */
3719 mod_timer(&bulk_eot_timer, jiffies + BULK_EOT_TIMER_INTERVAL);
3721 /* No need to search any further. */
3726 dbg_bulk("Bulk DMA channel running.");
3730 void etrax_usb_hc_port_status_interrupt(usb_interrupt_registers_t *reg)
3732 etrax_hc_t *hc = reg->hc;
3733 __u16 r_usb_rh_port_status_1 = reg->r_usb_rh_port_status_1;
3734 __u16 r_usb_rh_port_status_2 = reg->r_usb_rh_port_status_2;
3738 /* The Etrax RH does not include a wPortChange register, so this has to be handled in software
3739 (by saving the old port status value for comparison when the port status interrupt happens).
3740 See section 11.16.2.6.2 in the USB 1.1 spec for details. */
3742 dbg_rh("hc->rh.prev_wPortStatus_1 = 0x%x", hc->rh.prev_wPortStatus_1);
3743 dbg_rh("hc->rh.prev_wPortStatus_2 = 0x%x", hc->rh.prev_wPortStatus_2);
3744 dbg_rh("r_usb_rh_port_status_1 = 0x%x", r_usb_rh_port_status_1);
3745 dbg_rh("r_usb_rh_port_status_2 = 0x%x", r_usb_rh_port_status_2);
3747 /* C_PORT_CONNECTION is set on any transition. */
3748 hc->rh.wPortChange_1 |=
3749 ((r_usb_rh_port_status_1 & (1 << RH_PORT_CONNECTION)) !=
3750 (hc->rh.prev_wPortStatus_1 & (1 << RH_PORT_CONNECTION))) ?
3751 (1 << RH_PORT_CONNECTION) : 0;
3753 hc->rh.wPortChange_2 |=
3754 ((r_usb_rh_port_status_2 & (1 << RH_PORT_CONNECTION)) !=
3755 (hc->rh.prev_wPortStatus_2 & (1 << RH_PORT_CONNECTION))) ?
3756 (1 << RH_PORT_CONNECTION) : 0;
3758 /* C_PORT_ENABLE is _only_ set on a one to zero transition, i.e. when
3759 the port is disabled, not when it's enabled. */
3760 hc->rh.wPortChange_1 |=
3761 ((hc->rh.prev_wPortStatus_1 & (1 << RH_PORT_ENABLE))
3762 && !(r_usb_rh_port_status_1 & (1 << RH_PORT_ENABLE))) ?
3763 (1 << RH_PORT_ENABLE) : 0;
3765 hc->rh.wPortChange_2 |=
3766 ((hc->rh.prev_wPortStatus_2 & (1 << RH_PORT_ENABLE))
3767 && !(r_usb_rh_port_status_2 & (1 << RH_PORT_ENABLE))) ?
3768 (1 << RH_PORT_ENABLE) : 0;
3770 /* C_PORT_SUSPEND is set to one when the device has transitioned out
3771 of the suspended state, i.e. when suspend goes from one to zero. */
3772 hc->rh.wPortChange_1 |=
3773 ((hc->rh.prev_wPortStatus_1 & (1 << RH_PORT_SUSPEND))
3774 && !(r_usb_rh_port_status_1 & (1 << RH_PORT_SUSPEND))) ?
3775 (1 << RH_PORT_SUSPEND) : 0;
3777 hc->rh.wPortChange_2 |=
3778 ((hc->rh.prev_wPortStatus_2 & (1 << RH_PORT_SUSPEND))
3779 && !(r_usb_rh_port_status_2 & (1 << RH_PORT_SUSPEND))) ?
3780 (1 << RH_PORT_SUSPEND) : 0;
3783 /* C_PORT_RESET is set when reset processing on this port is complete. */
3784 hc->rh.wPortChange_1 |=
3785 ((hc->rh.prev_wPortStatus_1 & (1 << RH_PORT_RESET))
3786 && !(r_usb_rh_port_status_1 & (1 << RH_PORT_RESET))) ?
3787 (1 << RH_PORT_RESET) : 0;
3789 hc->rh.wPortChange_2 |=
3790 ((hc->rh.prev_wPortStatus_2 & (1 << RH_PORT_RESET))
3791 && !(r_usb_rh_port_status_2 & (1 << RH_PORT_RESET))) ?
3792 (1 << RH_PORT_RESET) : 0;
3794 /* Save the new values for next port status change. */
3795 hc->rh.prev_wPortStatus_1 = r_usb_rh_port_status_1;
3796 hc->rh.prev_wPortStatus_2 = r_usb_rh_port_status_2;
3798 dbg_rh("hc->rh.wPortChange_1 set to 0x%x", hc->rh.wPortChange_1);
3799 dbg_rh("hc->rh.wPortChange_2 set to 0x%x", hc->rh.wPortChange_2);
3805 void etrax_usb_hc_ctl_status_interrupt(usb_interrupt_registers_t *reg)
3809 /* FIXME: What should we do if we get ourun or perror? Dump the EP and SB
3810 list for the corresponding epid? */
3811 if (reg->r_usb_status & IO_MASK(R_USB_STATUS, ourun)) {
3812 panic("USB controller got ourun.");
3814 if (reg->r_usb_status & IO_MASK(R_USB_STATUS, perror)) {
3816 /* Before, etrax_usb_do_intr_recover was called on this epid if it was
3817 an interrupt pipe. I don't see how re-enabling all EP descriptors
3818 will help if there was a programming error. */
3819 panic("USB controller got perror.");
3822 if (reg->r_usb_status & IO_MASK(R_USB_STATUS, device_mode)) {
3823 /* We should never operate in device mode. */
3824 panic("USB controller in device mode.");
3827 /* These if-statements could probably be nested. */
3828 if (reg->r_usb_status & IO_MASK(R_USB_STATUS, host_mode)) {
3829 info("USB controller in host mode.");
3831 if (reg->r_usb_status & IO_MASK(R_USB_STATUS, started)) {
3832 info("USB controller started.");
3834 if (reg->r_usb_status & IO_MASK(R_USB_STATUS, running)) {
3835 info("USB controller running.");
3843 static int etrax_rh_submit_urb(struct urb *urb)
3845 struct usb_device *usb_dev = urb->dev;
3846 etrax_hc_t *hc = usb_dev->bus->hcpriv;
3847 unsigned int pipe = urb->pipe;
3848 struct usb_ctrlrequest *cmd = (struct usb_ctrlrequest *) urb->setup_packet;
3849 void *data = urb->transfer_buffer;
3850 int leni = urb->transfer_buffer_length;
3861 /* FIXME: What is this interrupt urb that is sent to the root hub? */
3862 if (usb_pipetype (pipe) == PIPE_INTERRUPT) {
3863 dbg_rh("Root-Hub submit IRQ: every %d ms", urb->interval);
3866 /* FIXME: We could probably remove this line since it's done
3867 in etrax_rh_init_int_timer. (Don't remove it from
3868 etrax_rh_init_int_timer though.) */
3869 hc->rh.interval = urb->interval;
3870 etrax_rh_init_int_timer(urb);
3876 bmRType_bReq = cmd->bRequestType | (cmd->bRequest << 8);
3877 wValue = le16_to_cpu(cmd->wValue);
3878 wIndex = le16_to_cpu(cmd->wIndex);
3879 wLength = le16_to_cpu(cmd->wLength);
3881 dbg_rh("bmRType_bReq : 0x%04x (%d)", bmRType_bReq, bmRType_bReq);
3882 dbg_rh("wValue : 0x%04x (%d)", wValue, wValue);
3883 dbg_rh("wIndex : 0x%04x (%d)", wIndex, wIndex);
3884 dbg_rh("wLength : 0x%04x (%d)", wLength, wLength);
3886 switch (bmRType_bReq) {
3888 /* Request Destination:
3889 without flags: Device,
3890 RH_INTERFACE: interface,
3891 RH_ENDPOINT: endpoint,
3892 RH_CLASS means HUB here,
3893 RH_OTHER | RH_CLASS almost ever means HUB_PORT here
3897 *(__u16 *) data = cpu_to_le16 (1);
3900 case RH_GET_STATUS | RH_INTERFACE:
3901 *(__u16 *) data = cpu_to_le16 (0);
3904 case RH_GET_STATUS | RH_ENDPOINT:
3905 *(__u16 *) data = cpu_to_le16 (0);
3908 case RH_GET_STATUS | RH_CLASS:
3909 *(__u32 *) data = cpu_to_le32 (0);
3910 OK (4); /* hub power ** */
3912 case RH_GET_STATUS | RH_OTHER | RH_CLASS:
3914 *((__u16*)data) = cpu_to_le16(hc->rh.prev_wPortStatus_1);
3915 *((__u16*)data + 1) = cpu_to_le16(hc->rh.wPortChange_1);
3916 } else if (wIndex == 2) {
3917 *((__u16*)data) = cpu_to_le16(hc->rh.prev_wPortStatus_2);
3918 *((__u16*)data + 1) = cpu_to_le16(hc->rh.wPortChange_2);
3920 dbg_rh("RH_GET_STATUS whith invalid wIndex!");
3926 case RH_CLEAR_FEATURE | RH_ENDPOINT:
3928 case (RH_ENDPOINT_STALL):
3933 case RH_CLEAR_FEATURE | RH_CLASS:
3935 case (RH_C_HUB_OVER_CURRENT):
3936 OK (0); /* hub power over current ** */
3940 case RH_CLEAR_FEATURE | RH_OTHER | RH_CLASS:
3942 case (RH_PORT_ENABLE):
3945 dbg_rh("trying to do disable port 1");
3947 *R_USB_PORT1_DISABLE = IO_STATE(R_USB_PORT1_DISABLE, disable, yes);
3949 while (hc->rh.prev_wPortStatus_1 &
3950 IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, yes));
3951 *R_USB_PORT1_DISABLE = IO_STATE(R_USB_PORT1_DISABLE, disable, no);
3952 dbg_rh("Port 1 is disabled");
3954 } else if (wIndex == 2) {
3956 dbg_rh("trying to do disable port 2");
3958 *R_USB_PORT2_DISABLE = IO_STATE(R_USB_PORT2_DISABLE, disable, yes);
3960 while (hc->rh.prev_wPortStatus_2 &
3961 IO_STATE(R_USB_RH_PORT_STATUS_2, enabled, yes));
3962 *R_USB_PORT2_DISABLE = IO_STATE(R_USB_PORT2_DISABLE, disable, no);
3963 dbg_rh("Port 2 is disabled");
3966 dbg_rh("RH_CLEAR_FEATURE->RH_PORT_ENABLE "
3967 "with invalid wIndex == %d!", wIndex);
3971 case (RH_PORT_SUSPEND):
3972 /* Opposite to suspend should be resume, so we'll do a resume. */
3973 /* FIXME: USB 1.1, 11.16.2.2 says:
3974 "Clearing the PORT_SUSPEND feature causes a host-initiated resume
3975 on the specified port. If the port is not in the Suspended state,
3976 the hub should treat this request as a functional no-operation."
3977 Shouldn't we check if the port is in a suspended state before
3980 /* Make sure the controller isn't busy. */
3981 while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
3985 IO_STATE(R_USB_COMMAND, port_sel, port1) |
3986 IO_STATE(R_USB_COMMAND, port_cmd, resume) |
3987 IO_STATE(R_USB_COMMAND, ctrl_cmd, nop);
3988 } else if (wIndex == 2) {
3990 IO_STATE(R_USB_COMMAND, port_sel, port2) |
3991 IO_STATE(R_USB_COMMAND, port_cmd, resume) |
3992 IO_STATE(R_USB_COMMAND, ctrl_cmd, nop);
3994 dbg_rh("RH_CLEAR_FEATURE->RH_PORT_SUSPEND "
3995 "with invalid wIndex == %d!", wIndex);
3999 case (RH_PORT_POWER):
4000 OK (0); /* port power ** */
4001 case (RH_C_PORT_CONNECTION):
4003 hc->rh.wPortChange_1 &= ~(1 << RH_PORT_CONNECTION);
4004 } else if (wIndex == 2) {
4005 hc->rh.wPortChange_2 &= ~(1 << RH_PORT_CONNECTION);
4007 dbg_rh("RH_CLEAR_FEATURE->RH_C_PORT_CONNECTION "
4008 "with invalid wIndex == %d!", wIndex);
4012 case (RH_C_PORT_ENABLE):
4014 hc->rh.wPortChange_1 &= ~(1 << RH_PORT_ENABLE);
4015 } else if (wIndex == 2) {
4016 hc->rh.wPortChange_2 &= ~(1 << RH_PORT_ENABLE);
4018 dbg_rh("RH_CLEAR_FEATURE->RH_C_PORT_ENABLE "
4019 "with invalid wIndex == %d!", wIndex);
4022 case (RH_C_PORT_SUSPEND):
4023 /*** WR_RH_PORTSTAT(RH_PS_PSSC); */
4025 case (RH_C_PORT_OVER_CURRENT):
4026 OK (0); /* port power over current ** */
4027 case (RH_C_PORT_RESET):
4029 hc->rh.wPortChange_1 &= ~(1 << RH_PORT_RESET);
4030 } else if (wIndex == 2) {
4031 hc->rh.wPortChange_2 &= ~(1 << RH_PORT_RESET);
4033 dbg_rh("RH_CLEAR_FEATURE->RH_C_PORT_RESET "
4034 "with invalid index == %d!", wIndex);
4042 case RH_SET_FEATURE | RH_OTHER | RH_CLASS:
4044 case (RH_PORT_SUSPEND):
4046 /* Make sure the controller isn't busy. */
4047 while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
4051 IO_STATE(R_USB_COMMAND, port_sel, port1) |
4052 IO_STATE(R_USB_COMMAND, port_cmd, suspend) |
4053 IO_STATE(R_USB_COMMAND, ctrl_cmd, nop);
4054 } else if (wIndex == 2) {
4056 IO_STATE(R_USB_COMMAND, port_sel, port2) |
4057 IO_STATE(R_USB_COMMAND, port_cmd, suspend) |
4058 IO_STATE(R_USB_COMMAND, ctrl_cmd, nop);
4060 dbg_rh("RH_SET_FEATURE->RH_PORT_SUSPEND "
4061 "with invalid wIndex == %d!", wIndex);
4065 case (RH_PORT_RESET):
4069 dbg_rh("Doing reset of port 1");
4071 /* Make sure the controller isn't busy. */
4072 while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
4075 IO_STATE(R_USB_COMMAND, port_sel, port1) |
4076 IO_STATE(R_USB_COMMAND, port_cmd, reset) |
4077 IO_STATE(R_USB_COMMAND, ctrl_cmd, nop);
4079 /* We must wait at least 10 ms for the device to recover.
4080 15 ms should be enough. */
4083 /* Wait for reset bit to go low (should be done by now). */
4084 while (hc->rh.prev_wPortStatus_1 &
4085 IO_STATE(R_USB_RH_PORT_STATUS_1, reset, yes));
4087 /* If the port status is
4088 1) connected and enabled then there is a device and everything is fine
4089 2) neither connected nor enabled then there is no device, also fine
4090 3) connected and not enabled then we try again
4091 (Yes, there are other port status combinations besides these.) */
4093 if ((hc->rh.prev_wPortStatus_1 &
4094 IO_STATE(R_USB_RH_PORT_STATUS_1, connected, yes)) &&
4095 (hc->rh.prev_wPortStatus_1 &
4096 IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, no))) {
4097 dbg_rh("Connected device on port 1, but port not enabled?"
4098 " Trying reset again.");
4102 /* Diagnostic printouts. */
4103 if ((hc->rh.prev_wPortStatus_1 &
4104 IO_STATE(R_USB_RH_PORT_STATUS_1, connected, no)) &&
4105 (hc->rh.prev_wPortStatus_1 &
4106 IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, no))) {
4107 dbg_rh("No connected device on port 1");
4108 } else if ((hc->rh.prev_wPortStatus_1 &
4109 IO_STATE(R_USB_RH_PORT_STATUS_1, connected, yes)) &&
4110 (hc->rh.prev_wPortStatus_1 &
4111 IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, yes))) {
4112 dbg_rh("Connected device on port 1, port 1 enabled");
4115 } else if (wIndex == 2) {
4118 dbg_rh("Doing reset of port 2");
4120 /* Make sure the controller isn't busy. */
4121 while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
4123 /* Issue the reset command. */
4125 IO_STATE(R_USB_COMMAND, port_sel, port2) |
4126 IO_STATE(R_USB_COMMAND, port_cmd, reset) |
4127 IO_STATE(R_USB_COMMAND, ctrl_cmd, nop);
4129 /* We must wait at least 10 ms for the device to recover.
4130 15 ms should be enough. */
4133 /* Wait for reset bit to go low (should be done by now). */
4134 while (hc->rh.prev_wPortStatus_2 &
4135 IO_STATE(R_USB_RH_PORT_STATUS_2, reset, yes));
4137 /* If the port status is
4138 1) connected and enabled then there is a device and everything is fine
4139 2) neither connected nor enabled then there is no device, also fine
4140 3) connected and not enabled then we try again
4141 (Yes, there are other port status combinations besides these.) */
4143 if ((hc->rh.prev_wPortStatus_2 &
4144 IO_STATE(R_USB_RH_PORT_STATUS_2, connected, yes)) &&
4145 (hc->rh.prev_wPortStatus_2 &
4146 IO_STATE(R_USB_RH_PORT_STATUS_2, enabled, no))) {
4147 dbg_rh("Connected device on port 2, but port not enabled?"
4148 " Trying reset again.");
4152 /* Diagnostic printouts. */
4153 if ((hc->rh.prev_wPortStatus_2 &
4154 IO_STATE(R_USB_RH_PORT_STATUS_2, connected, no)) &&
4155 (hc->rh.prev_wPortStatus_2 &
4156 IO_STATE(R_USB_RH_PORT_STATUS_2, enabled, no))) {
4157 dbg_rh("No connected device on port 2");
4158 } else if ((hc->rh.prev_wPortStatus_2 &
4159 IO_STATE(R_USB_RH_PORT_STATUS_2, connected, yes)) &&
4160 (hc->rh.prev_wPortStatus_2 &
4161 IO_STATE(R_USB_RH_PORT_STATUS_2, enabled, yes))) {
4162 dbg_rh("Connected device on port 2, port 2 enabled");
4166 dbg_rh("RH_SET_FEATURE->RH_PORT_RESET with invalid wIndex = %d", wIndex);
4169 /* Make sure the controller isn't busy. */
4170 while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
4172 /* If all enabled ports were disabled the host controller goes down into
4173 started mode, so we need to bring it back into the running state.
4174 (This is safe even if it's already in the running state.) */
4176 IO_STATE(R_USB_COMMAND, port_sel, nop) |
4177 IO_STATE(R_USB_COMMAND, port_cmd, reset) |
4178 IO_STATE(R_USB_COMMAND, ctrl_cmd, host_run);
4183 case (RH_PORT_POWER):
4184 OK (0); /* port power ** */
4185 case (RH_PORT_ENABLE):
4186 /* There is no port enable command in the host controller, so if the
4187 port is already enabled, we do nothing. If not, we reset the port
4188 (with an ugly goto). */
4191 if (hc->rh.prev_wPortStatus_1 &
4192 IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, no)) {
4195 } else if (wIndex == 2) {
4196 if (hc->rh.prev_wPortStatus_2 &
4197 IO_STATE(R_USB_RH_PORT_STATUS_2, enabled, no)) {
4201 dbg_rh("RH_SET_FEATURE->RH_GET_STATUS with invalid wIndex = %d", wIndex);
4207 case RH_SET_ADDRESS:
4208 hc->rh.devnum = wValue;
4209 dbg_rh("RH address set to: %d", hc->rh.devnum);
4212 case RH_GET_DESCRIPTOR:
4213 switch ((wValue & 0xff00) >> 8) {
4214 case (0x01): /* device descriptor */
4215 len = min_t(unsigned int, leni, min_t(unsigned int, sizeof (root_hub_dev_des), wLength));
4216 memcpy (data, root_hub_dev_des, len);
4218 case (0x02): /* configuration descriptor */
4219 len = min_t(unsigned int, leni, min_t(unsigned int, sizeof (root_hub_config_des), wLength));
4220 memcpy (data, root_hub_config_des, len);
4222 case (0x03): /* string descriptors */
4223 len = usb_root_hub_string (wValue & 0xff,
4224 0xff, "ETRAX 100LX",
4235 case RH_GET_DESCRIPTOR | RH_CLASS:
4236 root_hub_hub_des[2] = hc->rh.numports;
4237 len = min_t(unsigned int, leni, min_t(unsigned int, sizeof (root_hub_hub_des), wLength));
4238 memcpy (data, root_hub_hub_des, len);
4241 case RH_GET_CONFIGURATION:
4242 *(__u8 *) data = 0x01;
4245 case RH_SET_CONFIGURATION:
4252 urb->actual_length = len;
4255 if (urb->complete) {
4256 urb->complete(urb, NULL);
4264 etrax_usb_bulk_eot_timer_func(unsigned long dummy)
4266 /* Because of a race condition in the top half, we might miss a bulk eot.
4267 This timer "simulates" a bulk eot if we don't get one for a while, hopefully
4268 correcting the situation. */
4269 dbg_bulk("bulk_eot_timer timed out.");
4270 etrax_usb_hc_bulk_eot_interrupt(1);
4274 etrax_usb_buffer_alloc(struct usb_bus* bus, size_t size,
4275 unsigned mem_flags, dma_addr_t *dma)
4277 return kmalloc(size, mem_flags);
4281 etrax_usb_buffer_free(struct usb_bus *bus, size_t size, void *addr, dma_addr_t dma)
4287 static struct device fake_device;
4289 static int __init etrax_usb_hc_init(void)
4291 static etrax_hc_t *hc;
4292 struct usb_bus *bus;
4293 struct usb_device *usb_rh;
4298 info("ETRAX 100LX USB-HCD %s (c) 2001-2003 Axis Communications AB\n", usb_hcd_version);
4300 hc = kmalloc(sizeof(etrax_hc_t), GFP_KERNEL);
4303 /* We use kmem_cache_* to make sure that all DMA desc. are dword aligned */
4304 /* Note that we specify sizeof(USB_EP_Desc_t) as the size, but also allocate
4305 SB descriptors from this cache. This is ok since sizeof(USB_EP_Desc_t) ==
4306 sizeof(USB_SB_Desc_t). */
4308 usb_desc_cache = kmem_cache_create("usb_desc_cache", sizeof(USB_EP_Desc_t), 0,
4309 SLAB_HWCACHE_ALIGN, 0, 0);
4310 assert(usb_desc_cache != NULL);
4312 top_half_reg_cache = kmem_cache_create("top_half_reg_cache",
4313 sizeof(usb_interrupt_registers_t),
4314 0, SLAB_HWCACHE_ALIGN, 0, 0);
4315 assert(top_half_reg_cache != NULL);
4317 isoc_compl_cache = kmem_cache_create("isoc_compl_cache",
4318 sizeof(usb_isoc_complete_data_t),
4319 0, SLAB_HWCACHE_ALIGN, 0, 0);
4320 assert(isoc_compl_cache != NULL);
4322 etrax_usb_bus = bus = usb_alloc_bus(&etrax_usb_device_operations);
4324 bus->bus_name="ETRAX 100LX";
4327 /* Initialize RH to the default address.
4328 And make sure that we have no status change indication */
4329 hc->rh.numports = 2; /* The RH has two ports */
4331 hc->rh.wPortChange_1 = 0;
4332 hc->rh.wPortChange_2 = 0;
4334 /* Also initate the previous values to zero */
4335 hc->rh.prev_wPortStatus_1 = 0;
4336 hc->rh.prev_wPortStatus_2 = 0;
4338 /* Initialize the intr-traffic flags */
4339 /* FIXME: This isn't used. (Besides, the error field isn't initialized.) */
4340 hc->intr.sleeping = 0;
4343 epid_usage_bitmask = 0;
4344 epid_out_traffic = 0;
4346 /* Mark the invalid epid as being used. */
4347 set_bit(INVALID_EPID, (void *)&epid_usage_bitmask);
4348 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, INVALID_EPID);
4350 /* The valid bit should still be set ('invalid' is in our world; not the hardware's). */
4351 *R_USB_EPT_DATA = (IO_STATE(R_USB_EPT_DATA, valid, yes) |
4352 IO_FIELD(R_USB_EPT_DATA, max_len, 1));
4354 /* Mark the dummy epid as being used. */
4355 set_bit(DUMMY_EPID, (void *)&epid_usage_bitmask);
4356 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, DUMMY_EPID);
4358 *R_USB_EPT_DATA = (IO_STATE(R_USB_EPT_DATA, valid, no) |
4359 IO_FIELD(R_USB_EPT_DATA, max_len, 1));
4361 /* Initialize the urb list by initiating a head for each list. */
4362 for (i = 0; i < NBR_OF_EPIDS; i++) {
4363 INIT_LIST_HEAD(&urb_list[i]);
4365 spin_lock_init(&urb_list_lock);
4367 INIT_LIST_HEAD(&urb_unlink_list);
4370 /* Initiate the bulk start timer. */
4371 init_timer(&bulk_start_timer);
4372 bulk_start_timer.expires = jiffies + BULK_START_TIMER_INTERVAL;
4373 bulk_start_timer.function = etrax_usb_bulk_start_timer_func;
4374 add_timer(&bulk_start_timer);
4377 /* Initiate the bulk eot timer. */
4378 init_timer(&bulk_eot_timer);
4379 bulk_eot_timer.expires = jiffies + BULK_EOT_TIMER_INTERVAL;
4380 bulk_eot_timer.function = etrax_usb_bulk_eot_timer_func;
4381 add_timer(&bulk_eot_timer);
4383 /* Set up the data structures for USB traffic. Note that this must be done before
4384 any interrupt that relies on sane DMA list occurrs. */
4391 device_initialize(&fake_device);
4392 kobject_set_name(&fake_device.kobj, "etrax_usb");
4393 kobject_add(&fake_device.kobj);
4394 kobject_uevent(&fake_device.kobj, KOBJ_ADD);
4395 hc->bus->controller = &fake_device;
4396 usb_register_bus(hc->bus);
4399 /* Note that these interrupts are not used. */
4400 IO_STATE(R_IRQ_MASK2_SET, dma8_sub0_descr, set) |
4401 /* Sub channel 1 (ctrl) descr. interrupts are used. */
4402 IO_STATE(R_IRQ_MASK2_SET, dma8_sub1_descr, set) |
4403 IO_STATE(R_IRQ_MASK2_SET, dma8_sub2_descr, set) |
4404 /* Sub channel 3 (isoc) descr. interrupts are used. */
4405 IO_STATE(R_IRQ_MASK2_SET, dma8_sub3_descr, set);
4407 /* Note that the dma9_descr interrupt is not used. */
4409 IO_STATE(R_IRQ_MASK2_SET, dma9_eop, set) |
4410 IO_STATE(R_IRQ_MASK2_SET, dma9_descr, set);
4412 /* FIXME: Enable iso_eof only when isoc traffic is running. */
4413 *R_USB_IRQ_MASK_SET =
4414 IO_STATE(R_USB_IRQ_MASK_SET, iso_eof, set) |
4415 IO_STATE(R_USB_IRQ_MASK_SET, bulk_eot, set) |
4416 IO_STATE(R_USB_IRQ_MASK_SET, epid_attn, set) |
4417 IO_STATE(R_USB_IRQ_MASK_SET, port_status, set) |
4418 IO_STATE(R_USB_IRQ_MASK_SET, ctl_status, set);
4421 if (request_irq(ETRAX_USB_HC_IRQ, etrax_usb_hc_interrupt_top_half, 0,
4422 "ETRAX 100LX built-in USB (HC)", hc)) {
4423 err("Could not allocate IRQ %d for USB", ETRAX_USB_HC_IRQ);
4424 etrax_usb_hc_cleanup();
4429 if (request_irq(ETRAX_USB_RX_IRQ, etrax_usb_rx_interrupt, 0,
4430 "ETRAX 100LX built-in USB (Rx)", hc)) {
4431 err("Could not allocate IRQ %d for USB", ETRAX_USB_RX_IRQ);
4432 etrax_usb_hc_cleanup();
4437 if (request_irq(ETRAX_USB_TX_IRQ, etrax_usb_tx_interrupt, 0,
4438 "ETRAX 100LX built-in USB (Tx)", hc)) {
4439 err("Could not allocate IRQ %d for USB", ETRAX_USB_TX_IRQ);
4440 etrax_usb_hc_cleanup();
4446 USB commands in host mode. The fields in this register should all be
4447 written to in one write. Do not read-modify-write one field at a time. A
4448 write to this register will trigger events in the USB controller and an
4449 incomplete command may lead to unpredictable results, and in worst case
4450 even to a deadlock in the controller.
4451 (Note however that the busy field is read-only, so no need to write to it.) */
4453 /* Check the busy bit before writing to R_USB_COMMAND. */
4455 while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
4457 /* Reset the USB interface. */
4459 IO_STATE(R_USB_COMMAND, port_sel, nop) |
4460 IO_STATE(R_USB_COMMAND, port_cmd, reset) |
4461 IO_STATE(R_USB_COMMAND, ctrl_cmd, reset);
4463 /* Designer's Reference, p. 8 - 10 says we should Initate R_USB_FM_PSTART to 0x2A30 (10800),
4464 to guarantee that control traffic gets 10% of the bandwidth, and periodic transfer may
4465 allocate the rest (90%). This doesn't work though. Read on for a lenghty explanation.
4467 While there is a difference between rev. 2 and rev. 3 of the ETRAX 100LX regarding the NAK
4468 behaviour, it doesn't solve this problem. What happens is that a control transfer will not
4469 be interrupted in its data stage when PSTART happens (the point at which periodic traffic
4470 is started). Thus, if PSTART is set to 10800 and its IN or OUT token is NAKed until just before
4471 PSTART happens, it will continue the IN/OUT transfer as long as it's ACKed. After it's done,
4472 there may be too little time left for an isochronous transfer, causing an epid attention
4473 interrupt due to perror. The work-around for this is to let the control transfers run at the
4474 end of the frame instead of at the beginning, and will be interrupted just fine if it doesn't
4475 fit into the frame. However, since there will *always* be a control transfer at the beginning
4476 of the frame, regardless of what we set PSTART to, that transfer might be a 64-byte transfer
4477 which consumes up to 15% of the frame, leaving only 85% for periodic traffic. The solution to
4478 this would be to 'dummy allocate' 5% of the frame with the usb_claim_bandwidth function to make
4479 sure that the periodic transfers that are inserted will always fit in the frame.
4481 The idea was suggested that a control transfer could be split up into several 8 byte transfers,
4482 so that it would be interrupted by PSTART, but since this can't be done for an IN transfer this
4483 hasn't been implemented.
4485 The value 11960 is chosen to be just after the SOF token, with a couple of bit times extra
4486 for possible bit stuffing. */
4488 *R_USB_FM_PSTART = IO_FIELD(R_USB_FM_PSTART, value, 11960);
4490 #ifdef CONFIG_ETRAX_USB_HOST_PORT1
4491 *R_USB_PORT1_DISABLE = IO_STATE(R_USB_PORT1_DISABLE, disable, no);
4494 #ifdef CONFIG_ETRAX_USB_HOST_PORT2
4495 *R_USB_PORT2_DISABLE = IO_STATE(R_USB_PORT2_DISABLE, disable, no);
4498 while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
4500 /* Configure the USB interface as a host controller. */
4502 IO_STATE(R_USB_COMMAND, port_sel, nop) |
4503 IO_STATE(R_USB_COMMAND, port_cmd, reset) |
4504 IO_STATE(R_USB_COMMAND, ctrl_cmd, host_config);
4506 /* Note: Do not reset any ports here. Await the port status interrupts, to have a controlled
4507 sequence of resetting the ports. If we reset both ports now, and there are devices
4508 on both ports, we will get a bus error because both devices will answer the set address
4511 while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
4513 /* Start processing of USB traffic. */
4515 IO_STATE(R_USB_COMMAND, port_sel, nop) |
4516 IO_STATE(R_USB_COMMAND, port_cmd, reset) |
4517 IO_STATE(R_USB_COMMAND, ctrl_cmd, host_run);
4519 while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
4521 usb_rh = usb_alloc_dev(NULL, hc->bus, 0);
4522 hc->bus->root_hub = usb_rh;
4523 usb_rh->state = USB_STATE_ADDRESS;
4524 usb_rh->speed = USB_SPEED_FULL;
4526 hc->bus->devnum_next = 2;
4527 usb_rh->ep0.desc.wMaxPacketSize = __const_cpu_to_le16(64);
4528 usb_get_device_descriptor(usb_rh, USB_DT_DEVICE_SIZE);
4529 usb_new_device(usb_rh);
4536 static void etrax_usb_hc_cleanup(void)
4540 free_irq(ETRAX_USB_HC_IRQ, NULL);
4541 free_irq(ETRAX_USB_RX_IRQ, NULL);
4542 free_irq(ETRAX_USB_TX_IRQ, NULL);
4544 usb_deregister_bus(etrax_usb_bus);
4546 /* FIXME: call kmem_cache_destroy here? */
4551 module_init(etrax_usb_hc_init);
4552 module_exit(etrax_usb_hc_cleanup);