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() ? GFP_ATOMIC : GFP_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 struct kmem_cache *usb_desc_cache;
280 /* Cache for the registers allocated in the top half. */
281 static struct kmem_cache *top_half_reg_cache;
283 /* Cache for the data allocated in the isoc descr top half. */
284 static struct kmem_cache *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 = 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);
482 static irqreturn_t etrax_usb_rx_interrupt(int irq, void *vhc);
483 static irqreturn_t etrax_usb_hc_interrupt_top_half(int irq, void *vhc);
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)
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, GFP_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)
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 = kmem_cache_zalloc(usb_desc_cache, SLAB_FLAG);
2167 assert(sb_desc != NULL);
2170 if (usb_pipeout(urb->pipe)) {
2172 dbg_bulk("Grabbing bulk OUT, urb 0x%lx, epid %d", (unsigned long)urb, epid);
2174 /* This is probably a sanity check of the bulk transaction length
2175 not being larger than 64 kB. */
2176 if (urb->transfer_buffer_length > 0xffff) {
2177 panic("urb->transfer_buffer_length > 0xffff");
2180 sb_desc->sw_len = urb->transfer_buffer_length;
2182 /* The rem field is don't care if it's not a full-length transfer, so setting
2183 it shouldn't hurt. Also, rem isn't used for OUT traffic. */
2184 sb_desc->command = (IO_FIELD(USB_SB_command, rem, 0) |
2185 IO_STATE(USB_SB_command, tt, out) |
2186 IO_STATE(USB_SB_command, eot, yes) |
2187 IO_STATE(USB_SB_command, eol, yes));
2189 /* The full field is set to yes, even if we don't actually check that this is
2190 a full-length transfer (i.e., that transfer_buffer_length % maxlen = 0).
2191 Setting full prevents the USB controller from sending an empty packet in
2192 that case. However, if URB_ZERO_PACKET was set we want that. */
2193 if (!(urb->transfer_flags & URB_ZERO_PACKET)) {
2194 sb_desc->command |= IO_STATE(USB_SB_command, full, yes);
2197 sb_desc->buf = virt_to_phys(urb->transfer_buffer);
2200 } else if (usb_pipein(urb->pipe)) {
2202 dbg_bulk("Grabbing bulk IN, urb 0x%lx, epid %d", (unsigned long)urb, epid);
2204 sb_desc->sw_len = urb->transfer_buffer_length ?
2205 (urb->transfer_buffer_length - 1) / maxlen + 1 : 0;
2207 /* The rem field is don't care if it's not a full-length transfer, so setting
2208 it shouldn't hurt. */
2210 (IO_FIELD(USB_SB_command, rem,
2211 urb->transfer_buffer_length % maxlen) |
2212 IO_STATE(USB_SB_command, tt, in) |
2213 IO_STATE(USB_SB_command, eot, yes) |
2214 IO_STATE(USB_SB_command, eol, yes));
2220 urb_priv->first_sb = sb_desc;
2221 urb_priv->last_sb = sb_desc;
2222 urb_priv->epid = epid;
2224 urb->hcpriv = urb_priv;
2226 /* Reset toggle bits and reset error count. */
2230 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
2233 /* FIXME: Is this a special case since the hold field is checked,
2234 or should we check hold in a lot of other cases as well? */
2235 if (*R_USB_EPT_DATA & IO_MASK(R_USB_EPT_DATA, hold)) {
2236 panic("Hold was set in %s", __FUNCTION__);
2239 /* Reset error counters (regardless of which direction this traffic is). */
2241 ~(IO_MASK(R_USB_EPT_DATA, error_count_in) |
2242 IO_MASK(R_USB_EPT_DATA, error_count_out));
2244 /* Software must preset the toggle bits. */
2245 if (usb_pipeout(urb->pipe)) {
2247 usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe), usb_pipeout(urb->pipe));
2248 *R_USB_EPT_DATA &= ~IO_MASK(R_USB_EPT_DATA, t_out);
2249 *R_USB_EPT_DATA |= IO_FIELD(R_USB_EPT_DATA, t_out, toggle);
2252 usb_gettoggle(urb->dev, usb_pipeendpoint(urb->pipe), usb_pipeout(urb->pipe));
2253 *R_USB_EPT_DATA &= ~IO_MASK(R_USB_EPT_DATA, t_in);
2254 *R_USB_EPT_DATA |= IO_FIELD(R_USB_EPT_DATA, t_in, toggle);
2257 /* Assert that the EP descriptor is disabled. */
2258 assert(!(TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable)));
2260 /* The reason we set the EP's sub pointer directly instead of
2261 walking the SB list and linking it last in the list is that we only
2262 have one active urb at a time (the rest are queued). */
2264 /* Note that we cannot have interrupts running when we have set the SB descriptor
2265 but the EP is not yet enabled. If a bulk eot happens for another EP, we will
2266 find this EP disabled and with a SB != 0, which will make us think that it's done. */
2267 TxBulkEPList[epid].sub = virt_to_phys(sb_desc);
2268 TxBulkEPList[epid].hw_len = 0;
2269 /* Note that we don't have to fill in the ep_id field since this
2270 was done when we allocated the EP descriptors in init_tx_bulk_ep. */
2272 /* Check if the dummy list is already with us (if several urbs were queued). */
2273 if (TxBulkEPList[epid].next != virt_to_phys(&TxBulkDummyEPList[epid][0])) {
2275 dbg_bulk("Inviting dummy list to the party for urb 0x%lx, epid %d",
2276 (unsigned long)urb, epid);
2278 /* The last EP in the dummy list already has its next pointer set to
2279 TxBulkEPList[epid].next. */
2281 /* We don't need to check if the DMA is at this EP or not before changing the
2282 next pointer, since we will do it in one 32-bit write (EP descriptors are
2284 TxBulkEPList[epid].next = virt_to_phys(&TxBulkDummyEPList[epid][0]);
2286 /* Enable the EP descr. */
2287 dbg_bulk("Enabling bulk EP for urb 0x%lx, epid %d", (unsigned long)urb, epid);
2288 TxBulkEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes);
2290 /* Everything is set up, safe to enable interrupts again. */
2291 restore_flags(flags);
2293 /* If the DMA bulk channel isn't running, we need to restart it if it
2294 has stopped at the last EP descriptor (DMA stopped because there was
2295 no more traffic) or if it has stopped at a dummy EP with the intr flag
2296 set (DMA stopped because we were too slow in inserting new traffic). */
2297 if (!(*R_DMA_CH8_SUB0_CMD & IO_MASK(R_DMA_CH8_SUB0_CMD, cmd))) {
2300 ep = (USB_EP_Desc_t *)phys_to_virt(*R_DMA_CH8_SUB0_EP);
2301 dbg_bulk("DMA channel not running in add");
2302 dbg_bulk("DMA is at 0x%lx", (unsigned long)ep);
2304 if (*R_DMA_CH8_SUB0_EP == virt_to_phys(&TxBulkEPList[NBR_OF_EPIDS - 1]) ||
2305 (ep->command & 0x8) >> 3) {
2306 *R_DMA_CH8_SUB0_CMD = IO_STATE(R_DMA_CH8_SUB0_CMD, cmd, start);
2307 /* Update/restart the bulk start timer since we just started the channel. */
2308 mod_timer(&bulk_start_timer, jiffies + BULK_START_TIMER_INTERVAL);
2309 /* Update/restart the bulk eot timer since we just inserted traffic. */
2310 mod_timer(&bulk_eot_timer, jiffies + BULK_EOT_TIMER_INTERVAL);
2317 static void etrax_usb_complete_bulk_urb(struct urb *urb, int status)
2319 etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
2320 int epid = urb_priv->epid;
2321 unsigned long flags;
2326 warn("Completing bulk urb with status %d.", status);
2328 dbg_bulk("Completing bulk urb 0x%lx for epid %d", (unsigned long)urb, epid);
2330 /* Update the urb list. */
2331 urb_list_del(urb, epid);
2333 /* For an IN pipe, we always set the actual length, regardless of whether there was
2334 an error or not (which means the device driver can use the data if it wants to). */
2335 if (usb_pipein(urb->pipe)) {
2336 urb->actual_length = urb_priv->rx_offset;
2338 /* Set actual_length for OUT urbs also; the USB mass storage driver seems
2339 to want that. We wouldn't know of any partial writes if there was an error. */
2341 urb->actual_length = urb->transfer_buffer_length;
2343 urb->actual_length = 0;
2347 /* FIXME: Is there something of the things below we shouldn't do if there was an error?
2348 Like, maybe we shouldn't toggle the toggle bits, or maybe we shouldn't insert more traffic. */
2353 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
2356 /* We need to fiddle with the toggle bits because the hardware doesn't do it for us. */
2357 if (usb_pipeout(urb->pipe)) {
2359 IO_EXTRACT(R_USB_EPT_DATA, t_out, *R_USB_EPT_DATA);
2360 usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
2361 usb_pipeout(urb->pipe), toggle);
2364 IO_EXTRACT(R_USB_EPT_DATA, t_in, *R_USB_EPT_DATA);
2365 usb_settoggle(urb->dev, usb_pipeendpoint(urb->pipe),
2366 usb_pipeout(urb->pipe), toggle);
2368 restore_flags(flags);
2370 /* Remember to free the SBs. */
2371 etrax_remove_from_sb_list(urb);
2375 /* If there are any more urb's in the list we'd better start sending */
2376 if (!urb_list_empty(epid)) {
2378 struct urb *new_urb;
2380 /* Get the first urb. */
2381 new_urb = urb_list_first(epid);
2384 dbg_bulk("More bulk for epid %d", epid);
2386 etrax_usb_add_to_bulk_sb_list(new_urb, epid);
2389 urb->status = status;
2391 /* We let any non-zero status from the layer above have precedence. */
2393 /* URB_SHORT_NOT_OK means that short reads (shorter than the endpoint's max length)
2394 is to be treated as an error. */
2395 if (urb->transfer_flags & URB_SHORT_NOT_OK) {
2396 if (usb_pipein(urb->pipe) &&
2397 (urb->actual_length !=
2398 usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe)))) {
2399 urb->status = -EREMOTEIO;
2404 if (urb->complete) {
2405 urb->complete(urb, NULL);
2408 if (urb_list_empty(epid)) {
2409 /* This means that this EP is now free, deconfigure it. */
2410 etrax_usb_free_epid(epid);
2412 /* No more traffic; time to clean up.
2413 Must set sub pointer to 0, since we look at the sub pointer when handling
2414 the bulk eot interrupt. */
2416 dbg_bulk("No bulk for epid %d", epid);
2418 TxBulkEPList[epid].sub = 0;
2420 /* Unlink the dummy list. */
2422 dbg_bulk("Kicking dummy list out of party for urb 0x%lx, epid %d",
2423 (unsigned long)urb, epid);
2425 /* No need to wait for the DMA before changing the next pointer.
2426 The modulo NBR_OF_EPIDS isn't actually necessary, since we will never use
2427 the last one (INVALID_EPID) for actual traffic. */
2428 TxBulkEPList[epid].next =
2429 virt_to_phys(&TxBulkEPList[(epid + 1) % NBR_OF_EPIDS]);
2435 static int etrax_usb_submit_ctrl_urb(struct urb *urb)
2439 unsigned long flags;
2440 etrax_urb_priv_t *urb_priv;
2444 /* FIXME: Return -ENXIO if there is already a queued urb for this endpoint? */
2446 /* Epid allocation, empty check and list add must be protected.
2448 Epid allocation because if we find an existing epid for this endpoint an urb might be
2449 completed (emptying the list) before we add the new urb to the list, causing the epid
2450 to be de-allocated. We would then start the transfer with an invalid epid -> epid attn.
2452 Empty check and add because otherwise we might conclude that the list is not empty,
2453 after which it becomes empty before we add the new urb to the list, causing us not to
2454 insert the new traffic into the SB list. */
2456 spin_lock_irqsave(&urb_list_lock, flags);
2457 epid = etrax_usb_setup_epid(urb);
2459 spin_unlock_irqrestore(&urb_list_lock, flags);
2463 empty = urb_list_empty(epid);
2464 urb_list_add(urb, epid);
2465 spin_unlock_irqrestore(&urb_list_lock, flags);
2467 dbg_ctrl("Adding ctrl urb 0x%lx to %s list, epid %d",
2468 (unsigned long)urb, empty ? "empty" : "", epid);
2470 /* Mark the urb as being in progress. */
2471 urb->status = -EINPROGRESS;
2473 /* Setup the hcpriv data. */
2474 urb_priv = kzalloc(sizeof(etrax_urb_priv_t), KMALLOC_FLAG);
2475 assert(urb_priv != NULL);
2476 /* This sets rx_offset to 0. */
2477 urb_priv->urb_state = NOT_STARTED;
2478 urb->hcpriv = urb_priv;
2481 etrax_usb_add_to_ctrl_sb_list(urb, epid);
2489 static void etrax_usb_add_to_ctrl_sb_list(struct urb *urb, int epid)
2491 USB_SB_Desc_t *sb_desc_setup;
2492 USB_SB_Desc_t *sb_desc_data;
2493 USB_SB_Desc_t *sb_desc_status;
2495 etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
2497 unsigned long flags;
2502 maxlen = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
2504 sb_desc_setup = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_FLAG);
2505 assert(sb_desc_setup != NULL);
2506 sb_desc_status = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_FLAG);
2507 assert(sb_desc_status != NULL);
2509 /* Initialize the mandatory setup SB descriptor (used only in control transfers) */
2510 sb_desc_setup->sw_len = 8;
2511 sb_desc_setup->command = (IO_FIELD(USB_SB_command, rem, 0) |
2512 IO_STATE(USB_SB_command, tt, setup) |
2513 IO_STATE(USB_SB_command, full, yes) |
2514 IO_STATE(USB_SB_command, eot, yes));
2516 sb_desc_setup->buf = virt_to_phys(urb->setup_packet);
2518 if (usb_pipeout(urb->pipe)) {
2519 dbg_ctrl("Transfer for epid %d is OUT", epid);
2521 /* If this Control OUT transfer has an optional data stage we add an OUT token
2522 before the mandatory IN (status) token, hence the reordered SB list */
2524 sb_desc_setup->next = virt_to_phys(sb_desc_status);
2525 if (urb->transfer_buffer) {
2527 dbg_ctrl("This OUT transfer has an extra data stage");
2529 sb_desc_data = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_FLAG);
2530 assert(sb_desc_data != NULL);
2532 sb_desc_setup->next = virt_to_phys(sb_desc_data);
2534 sb_desc_data->sw_len = urb->transfer_buffer_length;
2535 sb_desc_data->command = (IO_STATE(USB_SB_command, tt, out) |
2536 IO_STATE(USB_SB_command, full, yes) |
2537 IO_STATE(USB_SB_command, eot, yes));
2538 sb_desc_data->buf = virt_to_phys(urb->transfer_buffer);
2539 sb_desc_data->next = virt_to_phys(sb_desc_status);
2542 sb_desc_status->sw_len = 1;
2543 sb_desc_status->command = (IO_FIELD(USB_SB_command, rem, 0) |
2544 IO_STATE(USB_SB_command, tt, in) |
2545 IO_STATE(USB_SB_command, eot, yes) |
2546 IO_STATE(USB_SB_command, intr, yes) |
2547 IO_STATE(USB_SB_command, eol, yes));
2549 sb_desc_status->buf = 0;
2550 sb_desc_status->next = 0;
2552 } else if (usb_pipein(urb->pipe)) {
2554 dbg_ctrl("Transfer for epid %d is IN", epid);
2555 dbg_ctrl("transfer_buffer_length = %d", urb->transfer_buffer_length);
2556 dbg_ctrl("rem is calculated to %d", urb->transfer_buffer_length % maxlen);
2558 sb_desc_data = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, SLAB_FLAG);
2559 assert(sb_desc_data != NULL);
2561 sb_desc_setup->next = virt_to_phys(sb_desc_data);
2563 sb_desc_data->sw_len = urb->transfer_buffer_length ?
2564 (urb->transfer_buffer_length - 1) / maxlen + 1 : 0;
2565 dbg_ctrl("sw_len got %d", sb_desc_data->sw_len);
2567 sb_desc_data->command =
2568 (IO_FIELD(USB_SB_command, rem,
2569 urb->transfer_buffer_length % maxlen) |
2570 IO_STATE(USB_SB_command, tt, in) |
2571 IO_STATE(USB_SB_command, eot, yes));
2573 sb_desc_data->buf = 0;
2574 sb_desc_data->next = virt_to_phys(sb_desc_status);
2576 /* Read comment at zout_buffer declaration for an explanation to this. */
2577 sb_desc_status->sw_len = 1;
2578 sb_desc_status->command = (IO_FIELD(USB_SB_command, rem, 0) |
2579 IO_STATE(USB_SB_command, tt, zout) |
2580 IO_STATE(USB_SB_command, full, yes) |
2581 IO_STATE(USB_SB_command, eot, yes) |
2582 IO_STATE(USB_SB_command, intr, yes) |
2583 IO_STATE(USB_SB_command, eol, yes));
2585 sb_desc_status->buf = virt_to_phys(&zout_buffer[0]);
2586 sb_desc_status->next = 0;
2589 urb_priv->first_sb = sb_desc_setup;
2590 urb_priv->last_sb = sb_desc_status;
2591 urb_priv->epid = epid;
2593 urb_priv->urb_state = STARTED;
2595 /* Reset toggle bits and reset error count, remember to di and ei */
2596 /* Warning: it is possible that this locking doesn't work with bottom-halves */
2601 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
2603 if (*R_USB_EPT_DATA & IO_MASK(R_USB_EPT_DATA, hold)) {
2604 panic("Hold was set in %s", __FUNCTION__);
2608 /* FIXME: Compare with etrax_usb_add_to_bulk_sb_list where the toggle bits
2609 are set to a specific value. Why the difference? Read "Transfer and Toggle Bits
2610 in Designer's Reference, p. 8 - 11. */
2612 ~(IO_MASK(R_USB_EPT_DATA, error_count_in) |
2613 IO_MASK(R_USB_EPT_DATA, error_count_out) |
2614 IO_MASK(R_USB_EPT_DATA, t_in) |
2615 IO_MASK(R_USB_EPT_DATA, t_out));
2617 /* Since we use the rx interrupt to complete ctrl urbs, we can enable interrupts now
2618 (i.e. we don't check the sub pointer on an eot interrupt like we do for bulk traffic). */
2619 restore_flags(flags);
2621 /* Assert that the EP descriptor is disabled. */
2622 assert(!(TxCtrlEPList[epid].command & IO_MASK(USB_EP_command, enable)));
2624 /* Set up and enable the EP descriptor. */
2625 TxCtrlEPList[epid].sub = virt_to_phys(sb_desc_setup);
2626 TxCtrlEPList[epid].hw_len = 0;
2627 TxCtrlEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes);
2629 /* We start the DMA sub channel without checking if it's running or not, because:
2630 1) If it's already running, issuing the start command is a nop.
2631 2) We avoid a test-and-set race condition. */
2632 *R_DMA_CH8_SUB1_CMD = IO_STATE(R_DMA_CH8_SUB1_CMD, cmd, start);
2637 static void etrax_usb_complete_ctrl_urb(struct urb *urb, int status)
2639 etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
2640 int epid = urb_priv->epid;
2645 warn("Completing ctrl urb with status %d.", status);
2647 dbg_ctrl("Completing ctrl epid %d, urb 0x%lx", epid, (unsigned long)urb);
2649 /* Remove this urb from the list. */
2650 urb_list_del(urb, epid);
2652 /* For an IN pipe, we always set the actual length, regardless of whether there was
2653 an error or not (which means the device driver can use the data if it wants to). */
2654 if (usb_pipein(urb->pipe)) {
2655 urb->actual_length = urb_priv->rx_offset;
2658 /* FIXME: Is there something of the things below we shouldn't do if there was an error?
2659 Like, maybe we shouldn't insert more traffic. */
2661 /* Remember to free the SBs. */
2662 etrax_remove_from_sb_list(urb);
2666 /* If there are any more urbs in the list we'd better start sending. */
2667 if (!urb_list_empty(epid)) {
2668 struct urb *new_urb;
2670 /* Get the first urb. */
2671 new_urb = urb_list_first(epid);
2674 dbg_ctrl("More ctrl for epid %d, first urb = 0x%lx", epid, (unsigned long)new_urb);
2676 etrax_usb_add_to_ctrl_sb_list(new_urb, epid);
2679 urb->status = status;
2681 /* We let any non-zero status from the layer above have precedence. */
2683 /* URB_SHORT_NOT_OK means that short reads (shorter than the endpoint's max length)
2684 is to be treated as an error. */
2685 if (urb->transfer_flags & URB_SHORT_NOT_OK) {
2686 if (usb_pipein(urb->pipe) &&
2687 (urb->actual_length !=
2688 usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe)))) {
2689 urb->status = -EREMOTEIO;
2694 if (urb->complete) {
2695 urb->complete(urb, NULL);
2698 if (urb_list_empty(epid)) {
2699 /* No more traffic. Time to clean up. */
2700 etrax_usb_free_epid(epid);
2701 /* Must set sub pointer to 0. */
2702 dbg_ctrl("No ctrl for epid %d", epid);
2703 TxCtrlEPList[epid].sub = 0;
2709 static int etrax_usb_submit_intr_urb(struct urb *urb)
2716 if (usb_pipeout(urb->pipe)) {
2717 /* Unsupported transfer type.
2718 We don't support interrupt out traffic. (If we do, we can't support
2719 intervals for neither in or out traffic, but are forced to schedule all
2720 interrupt traffic in one frame.) */
2724 epid = etrax_usb_setup_epid(urb);
2730 if (!urb_list_empty(epid)) {
2731 /* There is already a queued urb for this endpoint. */
2732 etrax_usb_free_epid(epid);
2736 urb->status = -EINPROGRESS;
2738 dbg_intr("Add intr urb 0x%lx, to list, epid %d", (unsigned long)urb, epid);
2740 urb_list_add(urb, epid);
2741 etrax_usb_add_to_intr_sb_list(urb, epid);
2748 static void etrax_usb_add_to_intr_sb_list(struct urb *urb, int epid)
2751 volatile USB_EP_Desc_t *tmp_ep;
2752 volatile USB_EP_Desc_t *first_ep;
2758 etrax_urb_priv_t *urb_priv;
2762 maxlen = usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe));
2763 interval = urb->interval;
2765 urb_priv = kzalloc(sizeof(etrax_urb_priv_t), KMALLOC_FLAG);
2766 assert(urb_priv != NULL);
2767 urb->hcpriv = urb_priv;
2769 first_ep = &TxIntrEPList[0];
2771 /* Round of the interval to 2^n, it is obvious that this code favours
2772 smaller numbers, but that is actually a good thing */
2773 /* FIXME: The "rounding error" for larger intervals will be quite
2774 large. For in traffic this shouldn't be a problem since it will only
2775 mean that we "poll" more often. */
2776 for (i = 0; interval; i++) {
2777 interval = interval >> 1;
2779 interval = 1 << (i - 1);
2781 dbg_intr("Interval rounded to %d", interval);
2786 if (tmp_ep->command & IO_MASK(USB_EP_command, eof)) {
2787 if ((i % interval) == 0) {
2788 /* Insert the traffic ep after tmp_ep */
2789 USB_EP_Desc_t *ep_desc;
2790 USB_SB_Desc_t *sb_desc;
2792 dbg_intr("Inserting EP for epid %d", epid);
2794 ep_desc = (USB_EP_Desc_t *)
2795 kmem_cache_alloc(usb_desc_cache, SLAB_FLAG);
2796 sb_desc = (USB_SB_Desc_t *)
2797 kmem_cache_alloc(usb_desc_cache, SLAB_FLAG);
2798 assert(ep_desc != NULL);
2799 CHECK_ALIGN(ep_desc);
2800 assert(sb_desc != NULL);
2802 ep_desc->sub = virt_to_phys(sb_desc);
2803 ep_desc->hw_len = 0;
2804 ep_desc->command = (IO_FIELD(USB_EP_command, epid, epid) |
2805 IO_STATE(USB_EP_command, enable, yes));
2808 /* Round upwards the number of packets of size maxlen
2809 that this SB descriptor should receive. */
2810 sb_desc->sw_len = urb->transfer_buffer_length ?
2811 (urb->transfer_buffer_length - 1) / maxlen + 1 : 0;
2815 (IO_FIELD(USB_SB_command, rem, urb->transfer_buffer_length % maxlen) |
2816 IO_STATE(USB_SB_command, tt, in) |
2817 IO_STATE(USB_SB_command, eot, yes) |
2818 IO_STATE(USB_SB_command, eol, yes));
2820 ep_desc->next = tmp_ep->next;
2821 tmp_ep->next = virt_to_phys(ep_desc);
2825 tmp_ep = (USB_EP_Desc_t *)phys_to_virt(tmp_ep->next);
2826 } while (tmp_ep != first_ep);
2829 /* Note that first_sb/last_sb doesn't apply to interrupt traffic. */
2830 urb_priv->epid = epid;
2832 /* We start the DMA sub channel without checking if it's running or not, because:
2833 1) If it's already running, issuing the start command is a nop.
2834 2) We avoid a test-and-set race condition. */
2835 *R_DMA_CH8_SUB2_CMD = IO_STATE(R_DMA_CH8_SUB2_CMD, cmd, start);
2842 static void etrax_usb_complete_intr_urb(struct urb *urb, int status)
2844 etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
2845 int epid = urb_priv->epid;
2850 warn("Completing intr urb with status %d.", status);
2852 dbg_intr("Completing intr epid %d, urb 0x%lx", epid, (unsigned long)urb);
2854 urb->status = status;
2855 urb->actual_length = urb_priv->rx_offset;
2857 dbg_intr("interrupt urb->actual_length = %d", urb->actual_length);
2859 /* We let any non-zero status from the layer above have precedence. */
2861 /* URB_SHORT_NOT_OK means that short reads (shorter than the endpoint's max length)
2862 is to be treated as an error. */
2863 if (urb->transfer_flags & URB_SHORT_NOT_OK) {
2864 if (urb->actual_length !=
2865 usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe))) {
2866 urb->status = -EREMOTEIO;
2871 /* The driver will resubmit the URB so we need to remove it first */
2872 etrax_usb_unlink_urb(urb, 0);
2873 if (urb->complete) {
2874 urb->complete(urb, NULL);
2881 static int etrax_usb_submit_isoc_urb(struct urb *urb)
2884 unsigned long flags;
2888 dbg_isoc("Submitting isoc urb = 0x%lx", (unsigned long)urb);
2890 /* Epid allocation, empty check and list add must be protected.
2891 Read about this in etrax_usb_submit_ctrl_urb. */
2893 spin_lock_irqsave(&urb_list_lock, flags);
2894 /* Is there an active epid for this urb ? */
2895 epid = etrax_usb_setup_epid(urb);
2898 spin_unlock_irqrestore(&urb_list_lock, flags);
2902 /* Ok, now we got valid endpoint, lets insert some traffic */
2904 urb->status = -EINPROGRESS;
2906 /* Find the last urb in the URB_List and add this urb after that one.
2907 Also add the traffic, that is do an etrax_usb_add_to_isoc_sb_list. This
2908 is important to make this in "real time" since isochronous traffic is
2911 dbg_isoc("Adding isoc urb to (possibly empty) list");
2912 urb_list_add(urb, epid);
2913 etrax_usb_add_to_isoc_sb_list(urb, epid);
2914 spin_unlock_irqrestore(&urb_list_lock, flags);
2921 static void etrax_usb_check_error_isoc_ep(const int epid)
2923 unsigned long int flags;
2925 __u32 r_usb_ept_data;
2927 /* We can't read R_USB_EPID_ATTN here since it would clear the iso_eof,
2928 bulk_eot and epid_attn interrupts. So we just check the status of
2929 the epid without testing if for it in R_USB_EPID_ATTN. */
2934 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
2936 /* Note that although there are separate R_USB_EPT_DATA and R_USB_EPT_DATA_ISO
2937 registers, they are located at the same address and are of the same size.
2938 In other words, this read should be ok for isoc also. */
2939 r_usb_ept_data = *R_USB_EPT_DATA;
2940 restore_flags(flags);
2942 error_code = IO_EXTRACT(R_USB_EPT_DATA_ISO, error_code, r_usb_ept_data);
2944 if (r_usb_ept_data & IO_MASK(R_USB_EPT_DATA, hold)) {
2945 warn("Hold was set for epid %d.", epid);
2949 if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA_ISO, error_code, no_error)) {
2951 /* This indicates that the SB list of the ept was completed before
2952 new data was appended to it. This is not an error, but indicates
2953 large system or USB load and could possibly cause trouble for
2954 very timing sensitive USB device drivers so we log it.
2956 info("Isoc. epid %d disabled with no error", epid);
2959 } else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA_ISO, error_code, stall)) {
2960 /* Not really a protocol error, just says that the endpoint gave
2961 a stall response. Note that error_code cannot be stall for isoc. */
2962 panic("Isoc traffic cannot stall");
2964 } else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA_ISO, error_code, bus_error)) {
2965 /* Two devices responded to a transaction request. Must be resolved
2966 by software. FIXME: Reset ports? */
2967 panic("Bus error for epid %d."
2968 " Two devices responded to transaction request",
2971 } else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA, error_code, buffer_error)) {
2972 /* DMA overrun or underrun. */
2973 warn("Buffer overrun/underrun for epid %d. DMA too busy?", epid);
2975 /* It seems that error_code = buffer_error in
2976 R_USB_EPT_DATA/R_USB_EPT_DATA_ISO and ourun = yes in R_USB_STATUS
2977 are the same error. */
2982 static void etrax_usb_add_to_isoc_sb_list(struct urb *urb, int epid)
2987 etrax_urb_priv_t *urb_priv;
2988 USB_SB_Desc_t *prev_sb_desc, *next_sb_desc, *temp_sb_desc;
2992 prev_sb_desc = next_sb_desc = temp_sb_desc = NULL;
2994 urb_priv = kzalloc(sizeof(etrax_urb_priv_t), GFP_ATOMIC);
2995 assert(urb_priv != NULL);
2997 urb->hcpriv = urb_priv;
2998 urb_priv->epid = epid;
3000 if (usb_pipeout(urb->pipe)) {
3002 if (urb->number_of_packets == 0) panic("etrax_usb_add_to_isoc_sb_list 0 packets\n");
3004 dbg_isoc("Transfer for epid %d is OUT", epid);
3005 dbg_isoc("%d packets in URB", urb->number_of_packets);
3007 /* Create one SB descriptor for each packet and link them together. */
3008 for (i = 0; i < urb->number_of_packets; i++) {
3009 if (!urb->iso_frame_desc[i].length)
3012 next_sb_desc = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, GFP_ATOMIC);
3013 assert(next_sb_desc != NULL);
3015 if (urb->iso_frame_desc[i].length > 0) {
3017 next_sb_desc->command = (IO_STATE(USB_SB_command, tt, out) |
3018 IO_STATE(USB_SB_command, eot, yes));
3020 next_sb_desc->sw_len = urb->iso_frame_desc[i].length;
3021 next_sb_desc->buf = virt_to_phys((char*)urb->transfer_buffer + urb->iso_frame_desc[i].offset);
3023 /* Check if full length transfer. */
3024 if (urb->iso_frame_desc[i].length ==
3025 usb_maxpacket(urb->dev, urb->pipe, usb_pipeout(urb->pipe))) {
3026 next_sb_desc->command |= IO_STATE(USB_SB_command, full, yes);
3029 dbg_isoc("zero len packet");
3030 next_sb_desc->command = (IO_FIELD(USB_SB_command, rem, 0) |
3031 IO_STATE(USB_SB_command, tt, zout) |
3032 IO_STATE(USB_SB_command, eot, yes) |
3033 IO_STATE(USB_SB_command, full, yes));
3035 next_sb_desc->sw_len = 1;
3036 next_sb_desc->buf = virt_to_phys(&zout_buffer[0]);
3039 /* First SB descriptor that belongs to this urb */
3041 urb_priv->first_sb = next_sb_desc;
3043 prev_sb_desc->next = virt_to_phys(next_sb_desc);
3045 prev_sb_desc = next_sb_desc;
3048 next_sb_desc->command |= (IO_STATE(USB_SB_command, intr, yes) |
3049 IO_STATE(USB_SB_command, eol, yes));
3050 next_sb_desc->next = 0;
3051 urb_priv->last_sb = next_sb_desc;
3053 } else if (usb_pipein(urb->pipe)) {
3055 dbg_isoc("Transfer for epid %d is IN", epid);
3056 dbg_isoc("transfer_buffer_length = %d", urb->transfer_buffer_length);
3057 dbg_isoc("rem is calculated to %d", urb->iso_frame_desc[urb->number_of_packets - 1].length);
3059 /* Note that in descriptors for periodic traffic are not consumed. This means that
3060 the USB controller never propagates in the SB list. In other words, if there already
3061 is an SB descriptor in the list for this EP we don't have to do anything. */
3062 if (TxIsocEPList[epid].sub == 0) {
3063 dbg_isoc("Isoc traffic not already running, allocating SB");
3065 next_sb_desc = (USB_SB_Desc_t*)kmem_cache_alloc(usb_desc_cache, GFP_ATOMIC);
3066 assert(next_sb_desc != NULL);
3068 next_sb_desc->command = (IO_STATE(USB_SB_command, tt, in) |
3069 IO_STATE(USB_SB_command, eot, yes) |
3070 IO_STATE(USB_SB_command, eol, yes));
3072 next_sb_desc->next = 0;
3073 next_sb_desc->sw_len = 1; /* Actual number of packets is not relevant
3074 for periodic in traffic as long as it is more
3075 than zero. Set to 1 always. */
3076 next_sb_desc->buf = 0;
3078 /* The rem field is don't care for isoc traffic, so we don't set it. */
3080 /* Only one SB descriptor that belongs to this urb. */
3081 urb_priv->first_sb = next_sb_desc;
3082 urb_priv->last_sb = next_sb_desc;
3086 dbg_isoc("Isoc traffic already running, just setting first/last_sb");
3088 /* Each EP for isoc in will have only one SB descriptor, setup when submitting the
3089 already active urb. Note that even though we may have several first_sb/last_sb
3090 pointing at the same SB descriptor, they are freed only once (when the list has
3092 urb_priv->first_sb = phys_to_virt(TxIsocEPList[epid].sub);
3093 urb_priv->last_sb = phys_to_virt(TxIsocEPList[epid].sub);
3099 /* Find the spot to insert this urb and add it. */
3100 if (TxIsocEPList[epid].sub == 0) {
3101 /* First SB descriptor inserted in this list (in or out). */
3102 dbg_isoc("Inserting SB desc first in list");
3103 TxIsocEPList[epid].hw_len = 0;
3104 TxIsocEPList[epid].sub = virt_to_phys(urb_priv->first_sb);
3107 /* Isochronous traffic is already running, insert new traffic last (only out). */
3108 dbg_isoc("Inserting SB desc last in list");
3109 temp_sb_desc = phys_to_virt(TxIsocEPList[epid].sub);
3110 while ((temp_sb_desc->command & IO_MASK(USB_SB_command, eol)) !=
3111 IO_STATE(USB_SB_command, eol, yes)) {
3112 assert(temp_sb_desc->next);
3113 temp_sb_desc = phys_to_virt(temp_sb_desc->next);
3115 dbg_isoc("Appending list on desc 0x%p", temp_sb_desc);
3117 /* Next pointer must be set before eol is removed. */
3118 temp_sb_desc->next = virt_to_phys(urb_priv->first_sb);
3119 /* Clear the previous end of list flag since there is a new in the
3120 added SB descriptor list. */
3121 temp_sb_desc->command &= ~IO_MASK(USB_SB_command, eol);
3123 if (!(TxIsocEPList[epid].command & IO_MASK(USB_EP_command, enable))) {
3124 /* 8.8.5 in Designer's Reference says we should check for and correct
3125 any errors in the EP here. That should not be necessary if epid_attn
3126 is handled correctly, so we assume all is ok. */
3127 dbg_isoc("EP disabled");
3128 etrax_usb_check_error_isoc_ep(epid);
3130 /* The SB list was exhausted. */
3131 if (virt_to_phys(urb_priv->last_sb) != TxIsocEPList[epid].sub) {
3132 /* The new sublist did not get processed before the EP was
3133 disabled. Setup the EP again. */
3134 dbg_isoc("Set EP sub to new list");
3135 TxIsocEPList[epid].hw_len = 0;
3136 TxIsocEPList[epid].sub = virt_to_phys(urb_priv->first_sb);
3141 if (urb->transfer_flags & URB_ISO_ASAP) {
3142 /* The isoc transfer should be started as soon as possible. The start_frame
3143 field is a return value if URB_ISO_ASAP was set. Comparing R_USB_FM_NUMBER
3144 with a USB Chief trace shows that the first isoc IN token is sent 2 frames
3145 later. I'm not sure how this affects usage of the start_frame field by the
3146 device driver, or how it affects things when USB_ISO_ASAP is not set, so
3147 therefore there's no compensation for the 2 frame "lag" here. */
3148 urb->start_frame = (*R_USB_FM_NUMBER & 0x7ff);
3149 TxIsocEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes);
3150 urb_priv->urb_state = STARTED;
3151 dbg_isoc("URB_ISO_ASAP set, urb->start_frame set to %d", urb->start_frame);
3153 /* Not started yet. */
3154 urb_priv->urb_state = NOT_STARTED;
3155 dbg_isoc("urb_priv->urb_state set to NOT_STARTED");
3158 /* We start the DMA sub channel without checking if it's running or not, because:
3159 1) If it's already running, issuing the start command is a nop.
3160 2) We avoid a test-and-set race condition. */
3161 *R_DMA_CH8_SUB3_CMD = IO_STATE(R_DMA_CH8_SUB3_CMD, cmd, start);
3166 static void etrax_usb_complete_isoc_urb(struct urb *urb, int status)
3168 etrax_urb_priv_t *urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
3169 int epid = urb_priv->epid;
3170 int auto_resubmit = 0;
3173 dbg_isoc("complete urb 0x%p, status %d", urb, status);
3176 warn("Completing isoc urb with status %d.", status);
3178 if (usb_pipein(urb->pipe)) {
3181 /* Make that all isoc packets have status and length set before
3182 completing the urb. */
3183 for (i = urb_priv->isoc_packet_counter; i < urb->number_of_packets; i++) {
3184 urb->iso_frame_desc[i].actual_length = 0;
3185 urb->iso_frame_desc[i].status = -EPROTO;
3188 urb_list_del(urb, epid);
3190 if (!list_empty(&urb_list[epid])) {
3191 ((etrax_urb_priv_t *)(urb_list_first(epid)->hcpriv))->urb_state = STARTED;
3193 unsigned long int flags;
3194 if (TxIsocEPList[epid].command & IO_MASK(USB_EP_command, enable)) {
3195 /* The EP was enabled, disable it and wait. */
3196 TxIsocEPList[epid].command &= ~IO_MASK(USB_EP_command, enable);
3198 /* Ah, the luxury of busy-wait. */
3199 while (*R_DMA_CH8_SUB3_EP == virt_to_phys(&TxIsocEPList[epid]));
3202 etrax_remove_from_sb_list(urb);
3203 TxIsocEPList[epid].sub = 0;
3204 TxIsocEPList[epid].hw_len = 0;
3208 etrax_usb_free_epid(epid);
3209 restore_flags(flags);
3215 /* Release allocated bandwidth. */
3216 usb_release_bandwidth(urb->dev, urb, 0);
3217 } else if (usb_pipeout(urb->pipe)) {
3220 dbg_isoc("Isoc out urb complete 0x%p", urb);
3222 /* Update the urb list. */
3223 urb_list_del(urb, epid);
3225 freed_descr = etrax_remove_from_sb_list(urb);
3226 dbg_isoc("freed %d descriptors of %d packets", freed_descr, urb->number_of_packets);
3227 assert(freed_descr == urb->number_of_packets);
3231 /* Release allocated bandwidth. */
3232 usb_release_bandwidth(urb->dev, urb, 0);
3235 urb->status = status;
3236 if (urb->complete) {
3237 urb->complete(urb, NULL);
3240 if (auto_resubmit) {
3241 /* Check that urb was not unlinked by the complete callback. */
3242 if (__urb_list_entry(urb, epid)) {
3243 /* Move this one down the list. */
3244 urb_list_move_last(urb, epid);
3246 /* Mark the now first urb as started (may already be). */
3247 ((etrax_urb_priv_t *)(urb_list_first(epid)->hcpriv))->urb_state = STARTED;
3249 /* Must set this to 0 since this urb is still active after
3251 urb_priv->isoc_packet_counter = 0;
3253 warn("(ISOC) automatic resubmit urb 0x%p removed by complete.", urb);
3260 static void etrax_usb_complete_urb(struct urb *urb, int status)
3262 switch (usb_pipetype(urb->pipe)) {
3264 etrax_usb_complete_bulk_urb(urb, status);
3267 etrax_usb_complete_ctrl_urb(urb, status);
3269 case PIPE_INTERRUPT:
3270 etrax_usb_complete_intr_urb(urb, status);
3272 case PIPE_ISOCHRONOUS:
3273 etrax_usb_complete_isoc_urb(urb, status);
3276 err("Unknown pipetype");
3282 static irqreturn_t etrax_usb_hc_interrupt_top_half(int irq, void *vhc)
3284 usb_interrupt_registers_t *reg;
3285 unsigned long flags;
3289 __u16 port_status_1;
3290 __u16 port_status_2;
3295 /* Read critical registers into local variables, do kmalloc afterwards. */
3299 irq_mask = *R_USB_IRQ_MASK_READ;
3300 /* Reading R_USB_STATUS clears the ctl_status interrupt. Note that R_USB_STATUS
3301 must be read before R_USB_EPID_ATTN since reading the latter clears the
3302 ourun and perror fields of R_USB_STATUS. */
3303 status = *R_USB_STATUS;
3305 /* Reading R_USB_EPID_ATTN clears the iso_eof, bulk_eot and epid_attn interrupts. */
3306 epid_attn = *R_USB_EPID_ATTN;
3308 /* Reading R_USB_RH_PORT_STATUS_1 and R_USB_RH_PORT_STATUS_2 clears the
3309 port_status interrupt. */
3310 port_status_1 = *R_USB_RH_PORT_STATUS_1;
3311 port_status_2 = *R_USB_RH_PORT_STATUS_2;
3313 /* Reading R_USB_FM_NUMBER clears the sof interrupt. */
3314 /* Note: the lower 11 bits contain the actual frame number, sent with each sof. */
3315 fm_number = *R_USB_FM_NUMBER;
3317 restore_flags(flags);
3319 reg = (usb_interrupt_registers_t *)kmem_cache_alloc(top_half_reg_cache, GFP_ATOMIC);
3321 assert(reg != NULL);
3323 reg->hc = (etrax_hc_t *)vhc;
3325 /* Now put register values into kmalloc'd area. */
3326 reg->r_usb_irq_mask_read = irq_mask;
3327 reg->r_usb_status = status;
3328 reg->r_usb_epid_attn = epid_attn;
3329 reg->r_usb_rh_port_status_1 = port_status_1;
3330 reg->r_usb_rh_port_status_2 = port_status_2;
3331 reg->r_usb_fm_number = fm_number;
3333 INIT_WORK(®->usb_bh, etrax_usb_hc_interrupt_bottom_half, reg);
3334 schedule_work(®->usb_bh);
3341 static void etrax_usb_hc_interrupt_bottom_half(void *data)
3343 usb_interrupt_registers_t *reg = (usb_interrupt_registers_t *)data;
3344 __u32 irq_mask = reg->r_usb_irq_mask_read;
3348 /* Interrupts are handled in order of priority. */
3349 if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, epid_attn)) {
3350 etrax_usb_hc_epid_attn_interrupt(reg);
3352 if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, port_status)) {
3353 etrax_usb_hc_port_status_interrupt(reg);
3355 if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, ctl_status)) {
3356 etrax_usb_hc_ctl_status_interrupt(reg);
3358 if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, iso_eof)) {
3359 etrax_usb_hc_isoc_eof_interrupt();
3361 if (irq_mask & IO_MASK(R_USB_IRQ_MASK_READ, bulk_eot)) {
3362 /* Update/restart the bulk start timer since obviously the channel is running. */
3363 mod_timer(&bulk_start_timer, jiffies + BULK_START_TIMER_INTERVAL);
3364 /* Update/restart the bulk eot timer since we just received an bulk eot interrupt. */
3365 mod_timer(&bulk_eot_timer, jiffies + BULK_EOT_TIMER_INTERVAL);
3367 etrax_usb_hc_bulk_eot_interrupt(0);
3370 kmem_cache_free(top_half_reg_cache, reg);
3376 void etrax_usb_hc_isoc_eof_interrupt(void)
3379 etrax_urb_priv_t *urb_priv;
3381 unsigned long flags;
3385 /* Do not check the invalid epid (it has a valid sub pointer). */
3386 for (epid = 0; epid < NBR_OF_EPIDS - 1; epid++) {
3388 /* Do not check the invalid epid (it has a valid sub pointer). */
3389 if ((epid == DUMMY_EPID) || (epid == INVALID_EPID))
3392 /* Disable interrupts to block the isoc out descriptor interrupt handler
3393 from being called while the isoc EPID list is being checked.
3398 if (TxIsocEPList[epid].sub == 0) {
3399 /* Nothing here to see. */
3400 restore_flags(flags);
3404 /* Get the first urb (if any). */
3405 urb = urb_list_first(epid);
3407 warn("Ignoring NULL urb");
3408 restore_flags(flags);
3411 if (usb_pipein(urb->pipe)) {
3414 assert(usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS);
3416 urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
3419 if (urb_priv->urb_state == NOT_STARTED) {
3421 /* If ASAP is not set and urb->start_frame is the current frame,
3422 start the transfer. */
3423 if (!(urb->transfer_flags & URB_ISO_ASAP) &&
3424 (urb->start_frame == (*R_USB_FM_NUMBER & 0x7ff))) {
3426 dbg_isoc("Enabling isoc IN EP descr for epid %d", epid);
3427 TxIsocEPList[epid].command |= IO_STATE(USB_EP_command, enable, yes);
3429 /* This urb is now active. */
3430 urb_priv->urb_state = STARTED;
3435 restore_flags(flags);
3442 void etrax_usb_hc_bulk_eot_interrupt(int timer_induced)
3446 /* The technique is to run one urb at a time, wait for the eot interrupt at which
3447 point the EP descriptor has been disabled. */
3450 dbg_bulk("bulk eot%s", timer_induced ? ", called by timer" : "");
3452 for (epid = 0; epid < NBR_OF_EPIDS; epid++) {
3454 if (!(TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable)) &&
3455 (TxBulkEPList[epid].sub != 0)) {
3458 etrax_urb_priv_t *urb_priv;
3459 unsigned long flags;
3460 __u32 r_usb_ept_data;
3462 /* Found a disabled EP descriptor which has a non-null sub pointer.
3463 Verify that this ctrl EP descriptor got disabled no errors.
3464 FIXME: Necessary to check error_code? */
3465 dbg_bulk("for epid %d?", epid);
3467 /* Get the first urb. */
3468 urb = urb_list_first(epid);
3470 /* FIXME: Could this happen for valid reasons? Why did it disappear? Because of
3473 warn("NULL urb for epid %d", epid);
3478 urb_priv = (etrax_urb_priv_t *)urb->hcpriv;
3481 /* Sanity checks. */
3482 assert(usb_pipetype(urb->pipe) == PIPE_BULK);
3483 if (phys_to_virt(TxBulkEPList[epid].sub) != urb_priv->last_sb) {
3484 err("bulk endpoint got disabled before reaching last sb");
3487 /* For bulk IN traffic, there seems to be a race condition between
3488 between the bulk eot and eop interrupts, or rather an uncertainty regarding
3489 the order in which they happen. Normally we expect the eop interrupt from
3490 DMA channel 9 to happen before the eot interrupt.
3492 Therefore, we complete the bulk IN urb in the rx interrupt handler instead. */
3494 if (usb_pipein(urb->pipe)) {
3495 dbg_bulk("in urb, continuing");
3501 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
3503 r_usb_ept_data = *R_USB_EPT_DATA;
3504 restore_flags(flags);
3506 if (IO_EXTRACT(R_USB_EPT_DATA, error_code, r_usb_ept_data) ==
3507 IO_STATE_VALUE(R_USB_EPT_DATA, error_code, no_error)) {
3508 /* This means that the endpoint has no error, is disabled
3509 and had inserted traffic, i.e. transfer successfully completed. */
3510 etrax_usb_complete_bulk_urb(urb, 0);
3512 /* Shouldn't happen. We expect errors to be caught by epid attention. */
3513 err("Found disabled bulk EP desc, error_code != no_error");
3518 /* Normally, we should find (at least) one disabled EP descriptor with a valid sub pointer.
3519 However, because of the uncertainty in the deliverance of the eop/eot interrupts, we may
3520 not. Also, we might find two disabled EPs when handling an eot interrupt, and then find
3521 none the next time. */
3527 void etrax_usb_hc_epid_attn_interrupt(usb_interrupt_registers_t *reg)
3529 /* This function handles the epid attention interrupt. There are a variety of reasons
3530 for this interrupt to happen (Designer's Reference, p. 8 - 22 for the details):
3532 invalid ep_id - Invalid epid in an EP (EP disabled).
3533 stall - Not strictly an error condition (EP disabled).
3534 3rd error - Three successive transaction errors (EP disabled).
3535 buffer ourun - Buffer overrun or underrun (EP disabled).
3536 past eof1 - Intr or isoc transaction proceeds past EOF1.
3537 near eof - Intr or isoc transaction would not fit inside the frame.
3538 zout transfer - If zout transfer for a bulk endpoint (EP disabled).
3539 setup transfer - If setup transfer for a non-ctrl endpoint (EP disabled). */
3546 assert(reg != NULL);
3548 /* Note that we loop through all epids. We still want to catch errors for
3549 the invalid one, even though we might handle them differently. */
3550 for (epid = 0; epid < NBR_OF_EPIDS; epid++) {
3552 if (test_bit(epid, (void *)®->r_usb_epid_attn)) {
3555 __u32 r_usb_ept_data;
3556 unsigned long flags;
3561 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, epid);
3563 /* Note that although there are separate R_USB_EPT_DATA and R_USB_EPT_DATA_ISO
3564 registers, they are located at the same address and are of the same size.
3565 In other words, this read should be ok for isoc also. */
3566 r_usb_ept_data = *R_USB_EPT_DATA;
3567 restore_flags(flags);
3569 /* First some sanity checks. */
3570 if (epid == INVALID_EPID) {
3571 /* FIXME: What if it became disabled? Could seriously hurt interrupt
3572 traffic. (Use do_intr_recover.) */
3573 warn("Got epid_attn for INVALID_EPID (%d).", epid);
3574 err("R_USB_EPT_DATA = 0x%x", r_usb_ept_data);
3575 err("R_USB_STATUS = 0x%x", reg->r_usb_status);
3577 } else if (epid == DUMMY_EPID) {
3578 /* We definitely don't care about these ones. Besides, they are
3579 always disabled, so any possible disabling caused by the
3580 epid attention interrupt is irrelevant. */
3581 warn("Got epid_attn for DUMMY_EPID (%d).", epid);
3585 /* Get the first urb in the urb list for this epid. We blatantly assume
3586 that only the first urb could have caused the epid attention.
3587 (For bulk and ctrl, only one urb is active at any one time. For intr
3588 and isoc we remove them once they are completed.) */
3589 urb = urb_list_first(epid);
3592 err("Got epid_attn for epid %i with no urb.", epid);
3593 err("R_USB_EPT_DATA = 0x%x", r_usb_ept_data);
3594 err("R_USB_STATUS = 0x%x", reg->r_usb_status);
3598 switch (usb_pipetype(urb->pipe)) {
3600 warn("Got epid attn for bulk endpoint, epid %d", epid);
3603 warn("Got epid attn for control endpoint, epid %d", epid);
3605 case PIPE_INTERRUPT:
3606 warn("Got epid attn for interrupt endpoint, epid %d", epid);
3608 case PIPE_ISOCHRONOUS:
3609 warn("Got epid attn for isochronous endpoint, epid %d", epid);
3613 if (usb_pipetype(urb->pipe) != PIPE_ISOCHRONOUS) {
3614 if (r_usb_ept_data & IO_MASK(R_USB_EPT_DATA, hold)) {
3615 warn("Hold was set for epid %d.", epid);
3620 /* Even though error_code occupies bits 22 - 23 in both R_USB_EPT_DATA and
3621 R_USB_EPT_DATA_ISOC, we separate them here so we don't forget in other places. */
3622 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
3623 error_code = IO_EXTRACT(R_USB_EPT_DATA_ISO, error_code, r_usb_ept_data);
3625 error_code = IO_EXTRACT(R_USB_EPT_DATA, error_code, r_usb_ept_data);
3628 /* Using IO_STATE_VALUE on R_USB_EPT_DATA should be ok for isoc also. */
3629 if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA, error_code, no_error)) {
3631 /* Isoc traffic doesn't have error_count_in/error_count_out. */
3632 if ((usb_pipetype(urb->pipe) != PIPE_ISOCHRONOUS) &&
3633 (IO_EXTRACT(R_USB_EPT_DATA, error_count_in, r_usb_ept_data) == 3 ||
3634 IO_EXTRACT(R_USB_EPT_DATA, error_count_out, r_usb_ept_data) == 3)) {
3636 warn("3rd error for epid %i", epid);
3637 etrax_usb_complete_urb(urb, -EPROTO);
3639 } else if (reg->r_usb_status & IO_MASK(R_USB_STATUS, perror)) {
3641 warn("Perror for epid %d", epid);
3643 if (!(r_usb_ept_data & IO_MASK(R_USB_EPT_DATA, valid))) {
3645 panic("Perror because of invalid epid."
3646 " Deconfigured too early?");
3648 /* past eof1, near eof, zout transfer, setup transfer */
3650 /* Dump the urb and the relevant EP descriptor list. */
3653 __dump_ept_data(epid);
3654 __dump_ep_list(usb_pipetype(urb->pipe));
3656 panic("Something wrong with DMA descriptor contents."
3657 " Too much traffic inserted?");
3659 } else if (reg->r_usb_status & IO_MASK(R_USB_STATUS, ourun)) {
3661 panic("Buffer overrun/underrun for epid %d. DMA too busy?", epid);
3664 } else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA, error_code, stall)) {
3665 /* Not really a protocol error, just says that the endpoint gave
3666 a stall response. Note that error_code cannot be stall for isoc. */
3667 if (usb_pipetype(urb->pipe) == PIPE_ISOCHRONOUS) {
3668 panic("Isoc traffic cannot stall");
3671 warn("Stall for epid %d", epid);
3672 etrax_usb_complete_urb(urb, -EPIPE);
3674 } else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA, error_code, bus_error)) {
3675 /* Two devices responded to a transaction request. Must be resolved
3676 by software. FIXME: Reset ports? */
3677 panic("Bus error for epid %d."
3678 " Two devices responded to transaction request",
3681 } else if (error_code == IO_STATE_VALUE(R_USB_EPT_DATA, error_code, buffer_error)) {
3682 /* DMA overrun or underrun. */
3683 warn("Buffer overrun/underrun for epid %d. DMA too busy?", epid);
3685 /* It seems that error_code = buffer_error in
3686 R_USB_EPT_DATA/R_USB_EPT_DATA_ISO and ourun = yes in R_USB_STATUS
3687 are the same error. */
3688 etrax_usb_complete_urb(urb, -EPROTO);
3697 void etrax_usb_bulk_start_timer_func(unsigned long dummy)
3700 /* We might enable an EP descriptor behind the current DMA position when it's about
3701 to decide that there are no more bulk traffic and it should stop the bulk channel.
3702 Therefore we periodically check if the bulk channel is stopped and there is an
3703 enabled bulk EP descriptor, in which case we start the bulk channel. */
3704 dbg_bulk("bulk_start_timer timed out.");
3706 if (!(*R_DMA_CH8_SUB0_CMD & IO_MASK(R_DMA_CH8_SUB0_CMD, cmd))) {
3709 dbg_bulk("Bulk DMA channel not running.");
3711 for (epid = 0; epid < NBR_OF_EPIDS; epid++) {
3712 if (TxBulkEPList[epid].command & IO_MASK(USB_EP_command, enable)) {
3713 dbg_bulk("Found enabled EP for epid %d, starting bulk channel.\n",
3715 *R_DMA_CH8_SUB0_CMD = IO_STATE(R_DMA_CH8_SUB0_CMD, cmd, start);
3717 /* Restart the bulk eot timer since we just started the bulk channel. */
3718 mod_timer(&bulk_eot_timer, jiffies + BULK_EOT_TIMER_INTERVAL);
3720 /* No need to search any further. */
3725 dbg_bulk("Bulk DMA channel running.");
3729 void etrax_usb_hc_port_status_interrupt(usb_interrupt_registers_t *reg)
3731 etrax_hc_t *hc = reg->hc;
3732 __u16 r_usb_rh_port_status_1 = reg->r_usb_rh_port_status_1;
3733 __u16 r_usb_rh_port_status_2 = reg->r_usb_rh_port_status_2;
3737 /* The Etrax RH does not include a wPortChange register, so this has to be handled in software
3738 (by saving the old port status value for comparison when the port status interrupt happens).
3739 See section 11.16.2.6.2 in the USB 1.1 spec for details. */
3741 dbg_rh("hc->rh.prev_wPortStatus_1 = 0x%x", hc->rh.prev_wPortStatus_1);
3742 dbg_rh("hc->rh.prev_wPortStatus_2 = 0x%x", hc->rh.prev_wPortStatus_2);
3743 dbg_rh("r_usb_rh_port_status_1 = 0x%x", r_usb_rh_port_status_1);
3744 dbg_rh("r_usb_rh_port_status_2 = 0x%x", r_usb_rh_port_status_2);
3746 /* C_PORT_CONNECTION is set on any transition. */
3747 hc->rh.wPortChange_1 |=
3748 ((r_usb_rh_port_status_1 & (1 << RH_PORT_CONNECTION)) !=
3749 (hc->rh.prev_wPortStatus_1 & (1 << RH_PORT_CONNECTION))) ?
3750 (1 << RH_PORT_CONNECTION) : 0;
3752 hc->rh.wPortChange_2 |=
3753 ((r_usb_rh_port_status_2 & (1 << RH_PORT_CONNECTION)) !=
3754 (hc->rh.prev_wPortStatus_2 & (1 << RH_PORT_CONNECTION))) ?
3755 (1 << RH_PORT_CONNECTION) : 0;
3757 /* C_PORT_ENABLE is _only_ set on a one to zero transition, i.e. when
3758 the port is disabled, not when it's enabled. */
3759 hc->rh.wPortChange_1 |=
3760 ((hc->rh.prev_wPortStatus_1 & (1 << RH_PORT_ENABLE))
3761 && !(r_usb_rh_port_status_1 & (1 << RH_PORT_ENABLE))) ?
3762 (1 << RH_PORT_ENABLE) : 0;
3764 hc->rh.wPortChange_2 |=
3765 ((hc->rh.prev_wPortStatus_2 & (1 << RH_PORT_ENABLE))
3766 && !(r_usb_rh_port_status_2 & (1 << RH_PORT_ENABLE))) ?
3767 (1 << RH_PORT_ENABLE) : 0;
3769 /* C_PORT_SUSPEND is set to one when the device has transitioned out
3770 of the suspended state, i.e. when suspend goes from one to zero. */
3771 hc->rh.wPortChange_1 |=
3772 ((hc->rh.prev_wPortStatus_1 & (1 << RH_PORT_SUSPEND))
3773 && !(r_usb_rh_port_status_1 & (1 << RH_PORT_SUSPEND))) ?
3774 (1 << RH_PORT_SUSPEND) : 0;
3776 hc->rh.wPortChange_2 |=
3777 ((hc->rh.prev_wPortStatus_2 & (1 << RH_PORT_SUSPEND))
3778 && !(r_usb_rh_port_status_2 & (1 << RH_PORT_SUSPEND))) ?
3779 (1 << RH_PORT_SUSPEND) : 0;
3782 /* C_PORT_RESET is set when reset processing on this port is complete. */
3783 hc->rh.wPortChange_1 |=
3784 ((hc->rh.prev_wPortStatus_1 & (1 << RH_PORT_RESET))
3785 && !(r_usb_rh_port_status_1 & (1 << RH_PORT_RESET))) ?
3786 (1 << RH_PORT_RESET) : 0;
3788 hc->rh.wPortChange_2 |=
3789 ((hc->rh.prev_wPortStatus_2 & (1 << RH_PORT_RESET))
3790 && !(r_usb_rh_port_status_2 & (1 << RH_PORT_RESET))) ?
3791 (1 << RH_PORT_RESET) : 0;
3793 /* Save the new values for next port status change. */
3794 hc->rh.prev_wPortStatus_1 = r_usb_rh_port_status_1;
3795 hc->rh.prev_wPortStatus_2 = r_usb_rh_port_status_2;
3797 dbg_rh("hc->rh.wPortChange_1 set to 0x%x", hc->rh.wPortChange_1);
3798 dbg_rh("hc->rh.wPortChange_2 set to 0x%x", hc->rh.wPortChange_2);
3804 void etrax_usb_hc_ctl_status_interrupt(usb_interrupt_registers_t *reg)
3808 /* FIXME: What should we do if we get ourun or perror? Dump the EP and SB
3809 list for the corresponding epid? */
3810 if (reg->r_usb_status & IO_MASK(R_USB_STATUS, ourun)) {
3811 panic("USB controller got ourun.");
3813 if (reg->r_usb_status & IO_MASK(R_USB_STATUS, perror)) {
3815 /* Before, etrax_usb_do_intr_recover was called on this epid if it was
3816 an interrupt pipe. I don't see how re-enabling all EP descriptors
3817 will help if there was a programming error. */
3818 panic("USB controller got perror.");
3821 if (reg->r_usb_status & IO_MASK(R_USB_STATUS, device_mode)) {
3822 /* We should never operate in device mode. */
3823 panic("USB controller in device mode.");
3826 /* These if-statements could probably be nested. */
3827 if (reg->r_usb_status & IO_MASK(R_USB_STATUS, host_mode)) {
3828 info("USB controller in host mode.");
3830 if (reg->r_usb_status & IO_MASK(R_USB_STATUS, started)) {
3831 info("USB controller started.");
3833 if (reg->r_usb_status & IO_MASK(R_USB_STATUS, running)) {
3834 info("USB controller running.");
3842 static int etrax_rh_submit_urb(struct urb *urb)
3844 struct usb_device *usb_dev = urb->dev;
3845 etrax_hc_t *hc = usb_dev->bus->hcpriv;
3846 unsigned int pipe = urb->pipe;
3847 struct usb_ctrlrequest *cmd = (struct usb_ctrlrequest *) urb->setup_packet;
3848 void *data = urb->transfer_buffer;
3849 int leni = urb->transfer_buffer_length;
3860 /* FIXME: What is this interrupt urb that is sent to the root hub? */
3861 if (usb_pipetype (pipe) == PIPE_INTERRUPT) {
3862 dbg_rh("Root-Hub submit IRQ: every %d ms", urb->interval);
3865 /* FIXME: We could probably remove this line since it's done
3866 in etrax_rh_init_int_timer. (Don't remove it from
3867 etrax_rh_init_int_timer though.) */
3868 hc->rh.interval = urb->interval;
3869 etrax_rh_init_int_timer(urb);
3875 bmRType_bReq = cmd->bRequestType | (cmd->bRequest << 8);
3876 wValue = le16_to_cpu(cmd->wValue);
3877 wIndex = le16_to_cpu(cmd->wIndex);
3878 wLength = le16_to_cpu(cmd->wLength);
3880 dbg_rh("bmRType_bReq : 0x%04x (%d)", bmRType_bReq, bmRType_bReq);
3881 dbg_rh("wValue : 0x%04x (%d)", wValue, wValue);
3882 dbg_rh("wIndex : 0x%04x (%d)", wIndex, wIndex);
3883 dbg_rh("wLength : 0x%04x (%d)", wLength, wLength);
3885 switch (bmRType_bReq) {
3887 /* Request Destination:
3888 without flags: Device,
3889 RH_INTERFACE: interface,
3890 RH_ENDPOINT: endpoint,
3891 RH_CLASS means HUB here,
3892 RH_OTHER | RH_CLASS almost ever means HUB_PORT here
3896 *(__u16 *) data = cpu_to_le16 (1);
3899 case RH_GET_STATUS | RH_INTERFACE:
3900 *(__u16 *) data = cpu_to_le16 (0);
3903 case RH_GET_STATUS | RH_ENDPOINT:
3904 *(__u16 *) data = cpu_to_le16 (0);
3907 case RH_GET_STATUS | RH_CLASS:
3908 *(__u32 *) data = cpu_to_le32 (0);
3909 OK (4); /* hub power ** */
3911 case RH_GET_STATUS | RH_OTHER | RH_CLASS:
3913 *((__u16*)data) = cpu_to_le16(hc->rh.prev_wPortStatus_1);
3914 *((__u16*)data + 1) = cpu_to_le16(hc->rh.wPortChange_1);
3915 } else if (wIndex == 2) {
3916 *((__u16*)data) = cpu_to_le16(hc->rh.prev_wPortStatus_2);
3917 *((__u16*)data + 1) = cpu_to_le16(hc->rh.wPortChange_2);
3919 dbg_rh("RH_GET_STATUS whith invalid wIndex!");
3925 case RH_CLEAR_FEATURE | RH_ENDPOINT:
3927 case (RH_ENDPOINT_STALL):
3932 case RH_CLEAR_FEATURE | RH_CLASS:
3934 case (RH_C_HUB_OVER_CURRENT):
3935 OK (0); /* hub power over current ** */
3939 case RH_CLEAR_FEATURE | RH_OTHER | RH_CLASS:
3941 case (RH_PORT_ENABLE):
3944 dbg_rh("trying to do disable port 1");
3946 *R_USB_PORT1_DISABLE = IO_STATE(R_USB_PORT1_DISABLE, disable, yes);
3948 while (hc->rh.prev_wPortStatus_1 &
3949 IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, yes));
3950 *R_USB_PORT1_DISABLE = IO_STATE(R_USB_PORT1_DISABLE, disable, no);
3951 dbg_rh("Port 1 is disabled");
3953 } else if (wIndex == 2) {
3955 dbg_rh("trying to do disable port 2");
3957 *R_USB_PORT2_DISABLE = IO_STATE(R_USB_PORT2_DISABLE, disable, yes);
3959 while (hc->rh.prev_wPortStatus_2 &
3960 IO_STATE(R_USB_RH_PORT_STATUS_2, enabled, yes));
3961 *R_USB_PORT2_DISABLE = IO_STATE(R_USB_PORT2_DISABLE, disable, no);
3962 dbg_rh("Port 2 is disabled");
3965 dbg_rh("RH_CLEAR_FEATURE->RH_PORT_ENABLE "
3966 "with invalid wIndex == %d!", wIndex);
3970 case (RH_PORT_SUSPEND):
3971 /* Opposite to suspend should be resume, so we'll do a resume. */
3972 /* FIXME: USB 1.1, 11.16.2.2 says:
3973 "Clearing the PORT_SUSPEND feature causes a host-initiated resume
3974 on the specified port. If the port is not in the Suspended state,
3975 the hub should treat this request as a functional no-operation."
3976 Shouldn't we check if the port is in a suspended state before
3979 /* Make sure the controller isn't busy. */
3980 while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
3984 IO_STATE(R_USB_COMMAND, port_sel, port1) |
3985 IO_STATE(R_USB_COMMAND, port_cmd, resume) |
3986 IO_STATE(R_USB_COMMAND, ctrl_cmd, nop);
3987 } else if (wIndex == 2) {
3989 IO_STATE(R_USB_COMMAND, port_sel, port2) |
3990 IO_STATE(R_USB_COMMAND, port_cmd, resume) |
3991 IO_STATE(R_USB_COMMAND, ctrl_cmd, nop);
3993 dbg_rh("RH_CLEAR_FEATURE->RH_PORT_SUSPEND "
3994 "with invalid wIndex == %d!", wIndex);
3998 case (RH_PORT_POWER):
3999 OK (0); /* port power ** */
4000 case (RH_C_PORT_CONNECTION):
4002 hc->rh.wPortChange_1 &= ~(1 << RH_PORT_CONNECTION);
4003 } else if (wIndex == 2) {
4004 hc->rh.wPortChange_2 &= ~(1 << RH_PORT_CONNECTION);
4006 dbg_rh("RH_CLEAR_FEATURE->RH_C_PORT_CONNECTION "
4007 "with invalid wIndex == %d!", wIndex);
4011 case (RH_C_PORT_ENABLE):
4013 hc->rh.wPortChange_1 &= ~(1 << RH_PORT_ENABLE);
4014 } else if (wIndex == 2) {
4015 hc->rh.wPortChange_2 &= ~(1 << RH_PORT_ENABLE);
4017 dbg_rh("RH_CLEAR_FEATURE->RH_C_PORT_ENABLE "
4018 "with invalid wIndex == %d!", wIndex);
4021 case (RH_C_PORT_SUSPEND):
4022 /*** WR_RH_PORTSTAT(RH_PS_PSSC); */
4024 case (RH_C_PORT_OVER_CURRENT):
4025 OK (0); /* port power over current ** */
4026 case (RH_C_PORT_RESET):
4028 hc->rh.wPortChange_1 &= ~(1 << RH_PORT_RESET);
4029 } else if (wIndex == 2) {
4030 hc->rh.wPortChange_2 &= ~(1 << RH_PORT_RESET);
4032 dbg_rh("RH_CLEAR_FEATURE->RH_C_PORT_RESET "
4033 "with invalid index == %d!", wIndex);
4041 case RH_SET_FEATURE | RH_OTHER | RH_CLASS:
4043 case (RH_PORT_SUSPEND):
4045 /* Make sure the controller isn't busy. */
4046 while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
4050 IO_STATE(R_USB_COMMAND, port_sel, port1) |
4051 IO_STATE(R_USB_COMMAND, port_cmd, suspend) |
4052 IO_STATE(R_USB_COMMAND, ctrl_cmd, nop);
4053 } else if (wIndex == 2) {
4055 IO_STATE(R_USB_COMMAND, port_sel, port2) |
4056 IO_STATE(R_USB_COMMAND, port_cmd, suspend) |
4057 IO_STATE(R_USB_COMMAND, ctrl_cmd, nop);
4059 dbg_rh("RH_SET_FEATURE->RH_PORT_SUSPEND "
4060 "with invalid wIndex == %d!", wIndex);
4064 case (RH_PORT_RESET):
4068 dbg_rh("Doing reset of port 1");
4070 /* Make sure the controller isn't busy. */
4071 while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
4074 IO_STATE(R_USB_COMMAND, port_sel, port1) |
4075 IO_STATE(R_USB_COMMAND, port_cmd, reset) |
4076 IO_STATE(R_USB_COMMAND, ctrl_cmd, nop);
4078 /* We must wait at least 10 ms for the device to recover.
4079 15 ms should be enough. */
4082 /* Wait for reset bit to go low (should be done by now). */
4083 while (hc->rh.prev_wPortStatus_1 &
4084 IO_STATE(R_USB_RH_PORT_STATUS_1, reset, yes));
4086 /* If the port status is
4087 1) connected and enabled then there is a device and everything is fine
4088 2) neither connected nor enabled then there is no device, also fine
4089 3) connected and not enabled then we try again
4090 (Yes, there are other port status combinations besides these.) */
4092 if ((hc->rh.prev_wPortStatus_1 &
4093 IO_STATE(R_USB_RH_PORT_STATUS_1, connected, yes)) &&
4094 (hc->rh.prev_wPortStatus_1 &
4095 IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, no))) {
4096 dbg_rh("Connected device on port 1, but port not enabled?"
4097 " Trying reset again.");
4101 /* Diagnostic printouts. */
4102 if ((hc->rh.prev_wPortStatus_1 &
4103 IO_STATE(R_USB_RH_PORT_STATUS_1, connected, no)) &&
4104 (hc->rh.prev_wPortStatus_1 &
4105 IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, no))) {
4106 dbg_rh("No connected device on port 1");
4107 } else if ((hc->rh.prev_wPortStatus_1 &
4108 IO_STATE(R_USB_RH_PORT_STATUS_1, connected, yes)) &&
4109 (hc->rh.prev_wPortStatus_1 &
4110 IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, yes))) {
4111 dbg_rh("Connected device on port 1, port 1 enabled");
4114 } else if (wIndex == 2) {
4117 dbg_rh("Doing reset of port 2");
4119 /* Make sure the controller isn't busy. */
4120 while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
4122 /* Issue the reset command. */
4124 IO_STATE(R_USB_COMMAND, port_sel, port2) |
4125 IO_STATE(R_USB_COMMAND, port_cmd, reset) |
4126 IO_STATE(R_USB_COMMAND, ctrl_cmd, nop);
4128 /* We must wait at least 10 ms for the device to recover.
4129 15 ms should be enough. */
4132 /* Wait for reset bit to go low (should be done by now). */
4133 while (hc->rh.prev_wPortStatus_2 &
4134 IO_STATE(R_USB_RH_PORT_STATUS_2, reset, yes));
4136 /* If the port status is
4137 1) connected and enabled then there is a device and everything is fine
4138 2) neither connected nor enabled then there is no device, also fine
4139 3) connected and not enabled then we try again
4140 (Yes, there are other port status combinations besides these.) */
4142 if ((hc->rh.prev_wPortStatus_2 &
4143 IO_STATE(R_USB_RH_PORT_STATUS_2, connected, yes)) &&
4144 (hc->rh.prev_wPortStatus_2 &
4145 IO_STATE(R_USB_RH_PORT_STATUS_2, enabled, no))) {
4146 dbg_rh("Connected device on port 2, but port not enabled?"
4147 " Trying reset again.");
4151 /* Diagnostic printouts. */
4152 if ((hc->rh.prev_wPortStatus_2 &
4153 IO_STATE(R_USB_RH_PORT_STATUS_2, connected, no)) &&
4154 (hc->rh.prev_wPortStatus_2 &
4155 IO_STATE(R_USB_RH_PORT_STATUS_2, enabled, no))) {
4156 dbg_rh("No connected device on port 2");
4157 } else if ((hc->rh.prev_wPortStatus_2 &
4158 IO_STATE(R_USB_RH_PORT_STATUS_2, connected, yes)) &&
4159 (hc->rh.prev_wPortStatus_2 &
4160 IO_STATE(R_USB_RH_PORT_STATUS_2, enabled, yes))) {
4161 dbg_rh("Connected device on port 2, port 2 enabled");
4165 dbg_rh("RH_SET_FEATURE->RH_PORT_RESET with invalid wIndex = %d", wIndex);
4168 /* Make sure the controller isn't busy. */
4169 while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
4171 /* If all enabled ports were disabled the host controller goes down into
4172 started mode, so we need to bring it back into the running state.
4173 (This is safe even if it's already in the running state.) */
4175 IO_STATE(R_USB_COMMAND, port_sel, nop) |
4176 IO_STATE(R_USB_COMMAND, port_cmd, reset) |
4177 IO_STATE(R_USB_COMMAND, ctrl_cmd, host_run);
4182 case (RH_PORT_POWER):
4183 OK (0); /* port power ** */
4184 case (RH_PORT_ENABLE):
4185 /* There is no port enable command in the host controller, so if the
4186 port is already enabled, we do nothing. If not, we reset the port
4187 (with an ugly goto). */
4190 if (hc->rh.prev_wPortStatus_1 &
4191 IO_STATE(R_USB_RH_PORT_STATUS_1, enabled, no)) {
4194 } else if (wIndex == 2) {
4195 if (hc->rh.prev_wPortStatus_2 &
4196 IO_STATE(R_USB_RH_PORT_STATUS_2, enabled, no)) {
4200 dbg_rh("RH_SET_FEATURE->RH_GET_STATUS with invalid wIndex = %d", wIndex);
4206 case RH_SET_ADDRESS:
4207 hc->rh.devnum = wValue;
4208 dbg_rh("RH address set to: %d", hc->rh.devnum);
4211 case RH_GET_DESCRIPTOR:
4212 switch ((wValue & 0xff00) >> 8) {
4213 case (0x01): /* device descriptor */
4214 len = min_t(unsigned int, leni, min_t(unsigned int, sizeof (root_hub_dev_des), wLength));
4215 memcpy (data, root_hub_dev_des, len);
4217 case (0x02): /* configuration descriptor */
4218 len = min_t(unsigned int, leni, min_t(unsigned int, sizeof (root_hub_config_des), wLength));
4219 memcpy (data, root_hub_config_des, len);
4221 case (0x03): /* string descriptors */
4222 len = usb_root_hub_string (wValue & 0xff,
4223 0xff, "ETRAX 100LX",
4234 case RH_GET_DESCRIPTOR | RH_CLASS:
4235 root_hub_hub_des[2] = hc->rh.numports;
4236 len = min_t(unsigned int, leni, min_t(unsigned int, sizeof (root_hub_hub_des), wLength));
4237 memcpy (data, root_hub_hub_des, len);
4240 case RH_GET_CONFIGURATION:
4241 *(__u8 *) data = 0x01;
4244 case RH_SET_CONFIGURATION:
4251 urb->actual_length = len;
4254 if (urb->complete) {
4255 urb->complete(urb, NULL);
4263 etrax_usb_bulk_eot_timer_func(unsigned long dummy)
4265 /* Because of a race condition in the top half, we might miss a bulk eot.
4266 This timer "simulates" a bulk eot if we don't get one for a while, hopefully
4267 correcting the situation. */
4268 dbg_bulk("bulk_eot_timer timed out.");
4269 etrax_usb_hc_bulk_eot_interrupt(1);
4273 etrax_usb_buffer_alloc(struct usb_bus* bus, size_t size,
4274 unsigned mem_flags, dma_addr_t *dma)
4276 return kmalloc(size, mem_flags);
4280 etrax_usb_buffer_free(struct usb_bus *bus, size_t size, void *addr, dma_addr_t dma)
4286 static struct device fake_device;
4288 static int __init etrax_usb_hc_init(void)
4290 static etrax_hc_t *hc;
4291 struct usb_bus *bus;
4292 struct usb_device *usb_rh;
4297 info("ETRAX 100LX USB-HCD %s (c) 2001-2003 Axis Communications AB\n", usb_hcd_version);
4299 hc = kmalloc(sizeof(etrax_hc_t), GFP_KERNEL);
4302 /* We use kmem_cache_* to make sure that all DMA desc. are dword aligned */
4303 /* Note that we specify sizeof(USB_EP_Desc_t) as the size, but also allocate
4304 SB descriptors from this cache. This is ok since sizeof(USB_EP_Desc_t) ==
4305 sizeof(USB_SB_Desc_t). */
4307 usb_desc_cache = kmem_cache_create("usb_desc_cache", sizeof(USB_EP_Desc_t), 0,
4308 SLAB_HWCACHE_ALIGN, 0, 0);
4309 assert(usb_desc_cache != NULL);
4311 top_half_reg_cache = kmem_cache_create("top_half_reg_cache",
4312 sizeof(usb_interrupt_registers_t),
4313 0, SLAB_HWCACHE_ALIGN, 0, 0);
4314 assert(top_half_reg_cache != NULL);
4316 isoc_compl_cache = kmem_cache_create("isoc_compl_cache",
4317 sizeof(usb_isoc_complete_data_t),
4318 0, SLAB_HWCACHE_ALIGN, 0, 0);
4319 assert(isoc_compl_cache != NULL);
4321 etrax_usb_bus = bus = usb_alloc_bus(&etrax_usb_device_operations);
4323 bus->bus_name="ETRAX 100LX";
4326 /* Initialize RH to the default address.
4327 And make sure that we have no status change indication */
4328 hc->rh.numports = 2; /* The RH has two ports */
4330 hc->rh.wPortChange_1 = 0;
4331 hc->rh.wPortChange_2 = 0;
4333 /* Also initate the previous values to zero */
4334 hc->rh.prev_wPortStatus_1 = 0;
4335 hc->rh.prev_wPortStatus_2 = 0;
4337 /* Initialize the intr-traffic flags */
4338 /* FIXME: This isn't used. (Besides, the error field isn't initialized.) */
4339 hc->intr.sleeping = 0;
4342 epid_usage_bitmask = 0;
4343 epid_out_traffic = 0;
4345 /* Mark the invalid epid as being used. */
4346 set_bit(INVALID_EPID, (void *)&epid_usage_bitmask);
4347 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, INVALID_EPID);
4349 /* The valid bit should still be set ('invalid' is in our world; not the hardware's). */
4350 *R_USB_EPT_DATA = (IO_STATE(R_USB_EPT_DATA, valid, yes) |
4351 IO_FIELD(R_USB_EPT_DATA, max_len, 1));
4353 /* Mark the dummy epid as being used. */
4354 set_bit(DUMMY_EPID, (void *)&epid_usage_bitmask);
4355 *R_USB_EPT_INDEX = IO_FIELD(R_USB_EPT_INDEX, value, DUMMY_EPID);
4357 *R_USB_EPT_DATA = (IO_STATE(R_USB_EPT_DATA, valid, no) |
4358 IO_FIELD(R_USB_EPT_DATA, max_len, 1));
4360 /* Initialize the urb list by initiating a head for each list. */
4361 for (i = 0; i < NBR_OF_EPIDS; i++) {
4362 INIT_LIST_HEAD(&urb_list[i]);
4364 spin_lock_init(&urb_list_lock);
4366 INIT_LIST_HEAD(&urb_unlink_list);
4369 /* Initiate the bulk start timer. */
4370 init_timer(&bulk_start_timer);
4371 bulk_start_timer.expires = jiffies + BULK_START_TIMER_INTERVAL;
4372 bulk_start_timer.function = etrax_usb_bulk_start_timer_func;
4373 add_timer(&bulk_start_timer);
4376 /* Initiate the bulk eot timer. */
4377 init_timer(&bulk_eot_timer);
4378 bulk_eot_timer.expires = jiffies + BULK_EOT_TIMER_INTERVAL;
4379 bulk_eot_timer.function = etrax_usb_bulk_eot_timer_func;
4380 add_timer(&bulk_eot_timer);
4382 /* Set up the data structures for USB traffic. Note that this must be done before
4383 any interrupt that relies on sane DMA list occurrs. */
4390 device_initialize(&fake_device);
4391 kobject_set_name(&fake_device.kobj, "etrax_usb");
4392 kobject_add(&fake_device.kobj);
4393 kobject_uevent(&fake_device.kobj, KOBJ_ADD);
4394 hc->bus->controller = &fake_device;
4395 usb_register_bus(hc->bus);
4398 /* Note that these interrupts are not used. */
4399 IO_STATE(R_IRQ_MASK2_SET, dma8_sub0_descr, set) |
4400 /* Sub channel 1 (ctrl) descr. interrupts are used. */
4401 IO_STATE(R_IRQ_MASK2_SET, dma8_sub1_descr, set) |
4402 IO_STATE(R_IRQ_MASK2_SET, dma8_sub2_descr, set) |
4403 /* Sub channel 3 (isoc) descr. interrupts are used. */
4404 IO_STATE(R_IRQ_MASK2_SET, dma8_sub3_descr, set);
4406 /* Note that the dma9_descr interrupt is not used. */
4408 IO_STATE(R_IRQ_MASK2_SET, dma9_eop, set) |
4409 IO_STATE(R_IRQ_MASK2_SET, dma9_descr, set);
4411 /* FIXME: Enable iso_eof only when isoc traffic is running. */
4412 *R_USB_IRQ_MASK_SET =
4413 IO_STATE(R_USB_IRQ_MASK_SET, iso_eof, set) |
4414 IO_STATE(R_USB_IRQ_MASK_SET, bulk_eot, set) |
4415 IO_STATE(R_USB_IRQ_MASK_SET, epid_attn, set) |
4416 IO_STATE(R_USB_IRQ_MASK_SET, port_status, set) |
4417 IO_STATE(R_USB_IRQ_MASK_SET, ctl_status, set);
4420 if (request_irq(ETRAX_USB_HC_IRQ, etrax_usb_hc_interrupt_top_half, 0,
4421 "ETRAX 100LX built-in USB (HC)", hc)) {
4422 err("Could not allocate IRQ %d for USB", ETRAX_USB_HC_IRQ);
4423 etrax_usb_hc_cleanup();
4428 if (request_irq(ETRAX_USB_RX_IRQ, etrax_usb_rx_interrupt, 0,
4429 "ETRAX 100LX built-in USB (Rx)", hc)) {
4430 err("Could not allocate IRQ %d for USB", ETRAX_USB_RX_IRQ);
4431 etrax_usb_hc_cleanup();
4436 if (request_irq(ETRAX_USB_TX_IRQ, etrax_usb_tx_interrupt, 0,
4437 "ETRAX 100LX built-in USB (Tx)", hc)) {
4438 err("Could not allocate IRQ %d for USB", ETRAX_USB_TX_IRQ);
4439 etrax_usb_hc_cleanup();
4445 USB commands in host mode. The fields in this register should all be
4446 written to in one write. Do not read-modify-write one field at a time. A
4447 write to this register will trigger events in the USB controller and an
4448 incomplete command may lead to unpredictable results, and in worst case
4449 even to a deadlock in the controller.
4450 (Note however that the busy field is read-only, so no need to write to it.) */
4452 /* Check the busy bit before writing to R_USB_COMMAND. */
4454 while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
4456 /* Reset the USB interface. */
4458 IO_STATE(R_USB_COMMAND, port_sel, nop) |
4459 IO_STATE(R_USB_COMMAND, port_cmd, reset) |
4460 IO_STATE(R_USB_COMMAND, ctrl_cmd, reset);
4462 /* Designer's Reference, p. 8 - 10 says we should Initate R_USB_FM_PSTART to 0x2A30 (10800),
4463 to guarantee that control traffic gets 10% of the bandwidth, and periodic transfer may
4464 allocate the rest (90%). This doesn't work though. Read on for a lenghty explanation.
4466 While there is a difference between rev. 2 and rev. 3 of the ETRAX 100LX regarding the NAK
4467 behaviour, it doesn't solve this problem. What happens is that a control transfer will not
4468 be interrupted in its data stage when PSTART happens (the point at which periodic traffic
4469 is started). Thus, if PSTART is set to 10800 and its IN or OUT token is NAKed until just before
4470 PSTART happens, it will continue the IN/OUT transfer as long as it's ACKed. After it's done,
4471 there may be too little time left for an isochronous transfer, causing an epid attention
4472 interrupt due to perror. The work-around for this is to let the control transfers run at the
4473 end of the frame instead of at the beginning, and will be interrupted just fine if it doesn't
4474 fit into the frame. However, since there will *always* be a control transfer at the beginning
4475 of the frame, regardless of what we set PSTART to, that transfer might be a 64-byte transfer
4476 which consumes up to 15% of the frame, leaving only 85% for periodic traffic. The solution to
4477 this would be to 'dummy allocate' 5% of the frame with the usb_claim_bandwidth function to make
4478 sure that the periodic transfers that are inserted will always fit in the frame.
4480 The idea was suggested that a control transfer could be split up into several 8 byte transfers,
4481 so that it would be interrupted by PSTART, but since this can't be done for an IN transfer this
4482 hasn't been implemented.
4484 The value 11960 is chosen to be just after the SOF token, with a couple of bit times extra
4485 for possible bit stuffing. */
4487 *R_USB_FM_PSTART = IO_FIELD(R_USB_FM_PSTART, value, 11960);
4489 #ifdef CONFIG_ETRAX_USB_HOST_PORT1
4490 *R_USB_PORT1_DISABLE = IO_STATE(R_USB_PORT1_DISABLE, disable, no);
4493 #ifdef CONFIG_ETRAX_USB_HOST_PORT2
4494 *R_USB_PORT2_DISABLE = IO_STATE(R_USB_PORT2_DISABLE, disable, no);
4497 while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
4499 /* Configure the USB interface as a host controller. */
4501 IO_STATE(R_USB_COMMAND, port_sel, nop) |
4502 IO_STATE(R_USB_COMMAND, port_cmd, reset) |
4503 IO_STATE(R_USB_COMMAND, ctrl_cmd, host_config);
4505 /* Note: Do not reset any ports here. Await the port status interrupts, to have a controlled
4506 sequence of resetting the ports. If we reset both ports now, and there are devices
4507 on both ports, we will get a bus error because both devices will answer the set address
4510 while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
4512 /* Start processing of USB traffic. */
4514 IO_STATE(R_USB_COMMAND, port_sel, nop) |
4515 IO_STATE(R_USB_COMMAND, port_cmd, reset) |
4516 IO_STATE(R_USB_COMMAND, ctrl_cmd, host_run);
4518 while (*R_USB_COMMAND & IO_MASK(R_USB_COMMAND, busy));
4520 usb_rh = usb_alloc_dev(NULL, hc->bus, 0);
4521 hc->bus->root_hub = usb_rh;
4522 usb_rh->state = USB_STATE_ADDRESS;
4523 usb_rh->speed = USB_SPEED_FULL;
4525 hc->bus->devnum_next = 2;
4526 usb_rh->ep0.desc.wMaxPacketSize = __const_cpu_to_le16(64);
4527 usb_get_device_descriptor(usb_rh, USB_DT_DEVICE_SIZE);
4528 usb_new_device(usb_rh);
4535 static void etrax_usb_hc_cleanup(void)
4539 free_irq(ETRAX_USB_HC_IRQ, NULL);
4540 free_irq(ETRAX_USB_RX_IRQ, NULL);
4541 free_irq(ETRAX_USB_TX_IRQ, NULL);
4543 usb_deregister_bus(etrax_usb_bus);
4545 /* FIXME: call kmem_cache_destroy here? */
4550 module_init(etrax_usb_hc_init);
4551 module_exit(etrax_usb_hc_cleanup);