2 * Alchemy Semi Au1000 IrDA driver
4 * Copyright 2001 MontaVista Software Inc.
5 * Author: MontaVista Software, Inc.
6 * ppopov@mvista.com or source@mvista.com
8 * This program is free software; you can distribute it and/or modify it
9 * under the terms of the GNU General Public License (Version 2) as
10 * published by the Free Software Foundation.
12 * This program is distributed in the hope it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
21 #include <linux/config.h>
22 #include <linux/module.h>
23 #include <linux/types.h>
24 #include <linux/init.h>
25 #include <linux/errno.h>
26 #include <linux/netdevice.h>
27 #include <linux/slab.h>
28 #include <linux/rtnetlink.h>
29 #include <linux/interrupt.h>
31 #include <linux/bitops.h>
35 #include <asm/au1000.h>
36 #if defined(CONFIG_MIPS_PB1000) || defined(CONFIG_MIPS_PB1100)
37 #include <asm/pb1000.h>
38 #elif defined(CONFIG_MIPS_DB1000) || defined(CONFIG_MIPS_DB1100)
39 #include <asm/db1x00.h>
41 #error au1k_ir: unsupported board
44 #include <net/irda/irda.h>
45 #include <net/irda/irmod.h>
46 #include <net/irda/wrapper.h>
47 #include <net/irda/irda_device.h>
48 #include "au1000_ircc.h"
50 static int au1k_irda_net_init(struct net_device *);
51 static int au1k_irda_start(struct net_device *);
52 static int au1k_irda_stop(struct net_device *dev);
53 static int au1k_irda_hard_xmit(struct sk_buff *, struct net_device *);
54 static int au1k_irda_rx(struct net_device *);
55 static void au1k_irda_interrupt(int, void *, struct pt_regs *);
56 static void au1k_tx_timeout(struct net_device *);
57 static struct net_device_stats *au1k_irda_stats(struct net_device *);
58 static int au1k_irda_ioctl(struct net_device *, struct ifreq *, int);
59 static int au1k_irda_set_speed(struct net_device *dev, int speed);
61 static void *dma_alloc(size_t, dma_addr_t *);
62 static void dma_free(void *, size_t);
64 static int qos_mtt_bits = 0x07; /* 1 ms or more */
65 static struct net_device *ir_devs[NUM_IR_IFF];
66 static char version[] __devinitdata =
67 "au1k_ircc:1.2 ppopov@mvista.com\n";
69 #define RUN_AT(x) (jiffies + (x))
71 #if defined(CONFIG_MIPS_DB1000) || defined(CONFIG_MIPS_DB1100)
72 static BCSR * const bcsr = (BCSR *)0xAE000000;
75 static DEFINE_SPINLOCK(ir_lock);
78 * IrDA peripheral bug. You have to read the register
79 * twice to get the right value.
81 u32 read_ir_reg(u32 addr)
89 * Buffer allocation/deallocation routines. The buffer descriptor returned
90 * has the virtual and dma address of a buffer suitable for
91 * both, receive and transmit operations.
93 static db_dest_t *GetFreeDB(struct au1k_private *aup)
99 aup->pDBfree = pDB->pnext;
104 static void ReleaseDB(struct au1k_private *aup, db_dest_t *pDB)
106 db_dest_t *pDBfree = aup->pDBfree;
108 pDBfree->pnext = pDB;
114 DMA memory allocation, derived from pci_alloc_consistent.
115 However, the Au1000 data cache is coherent (when programmed
116 so), therefore we return KSEG0 address, not KSEG1.
118 static void *dma_alloc(size_t size, dma_addr_t * dma_handle)
121 int gfp = GFP_ATOMIC | GFP_DMA;
123 ret = (void *) __get_free_pages(gfp, get_order(size));
126 memset(ret, 0, size);
127 *dma_handle = virt_to_bus(ret);
128 ret = (void *)KSEG0ADDR(ret);
134 static void dma_free(void *vaddr, size_t size)
136 vaddr = (void *)KSEG0ADDR(vaddr);
137 free_pages((unsigned long) vaddr, get_order(size));
142 setup_hw_rings(struct au1k_private *aup, u32 rx_base, u32 tx_base)
145 for (i=0; i<NUM_IR_DESC; i++) {
146 aup->rx_ring[i] = (volatile ring_dest_t *)
147 (rx_base + sizeof(ring_dest_t)*i);
149 for (i=0; i<NUM_IR_DESC; i++) {
150 aup->tx_ring[i] = (volatile ring_dest_t *)
151 (tx_base + sizeof(ring_dest_t)*i);
155 static int au1k_irda_init(void)
157 static unsigned version_printed = 0;
158 struct au1k_private *aup;
159 struct net_device *dev;
162 if (version_printed++ == 0) printk(version);
164 dev = alloc_irdadev(sizeof(struct au1k_private));
168 dev->irq = AU1000_IRDA_RX_INT; /* TX has its own interrupt */
169 err = au1k_irda_net_init(dev);
172 err = register_netdev(dev);
176 printk(KERN_INFO "IrDA: Registered device %s\n", dev->name);
180 aup = netdev_priv(dev);
181 dma_free((void *)aup->db[0].vaddr,
182 MAX_BUF_SIZE * 2*NUM_IR_DESC);
183 dma_free((void *)aup->rx_ring[0],
184 2 * MAX_NUM_IR_DESC*(sizeof(ring_dest_t)));
185 kfree(aup->rx_buff.head);
191 static int au1k_irda_init_iobuf(iobuff_t *io, int size)
193 io->head = kmalloc(size, GFP_KERNEL);
194 if (io->head != NULL) {
196 io->in_frame = FALSE;
197 io->state = OUTSIDE_FRAME;
200 return io->head ? 0 : -ENOMEM;
203 static int au1k_irda_net_init(struct net_device *dev)
205 struct au1k_private *aup = netdev_priv(dev);
206 int i, retval = 0, err;
207 db_dest_t *pDB, *pDBfree;
210 err = au1k_irda_init_iobuf(&aup->rx_buff, 14384);
214 dev->open = au1k_irda_start;
215 dev->hard_start_xmit = au1k_irda_hard_xmit;
216 dev->stop = au1k_irda_stop;
217 dev->get_stats = au1k_irda_stats;
218 dev->do_ioctl = au1k_irda_ioctl;
219 dev->tx_timeout = au1k_tx_timeout;
221 irda_init_max_qos_capabilies(&aup->qos);
223 /* The only value we must override it the baudrate */
224 aup->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|
225 IR_115200|IR_576000 |(IR_4000000 << 8);
227 aup->qos.min_turn_time.bits = qos_mtt_bits;
228 irda_qos_bits_to_value(&aup->qos);
232 /* Tx ring follows rx ring + 512 bytes */
233 /* we need a 1k aligned buffer */
234 aup->rx_ring[0] = (ring_dest_t *)
235 dma_alloc(2*MAX_NUM_IR_DESC*(sizeof(ring_dest_t)), &temp);
236 if (!aup->rx_ring[0])
239 /* allocate the data buffers */
241 (void *)dma_alloc(MAX_BUF_SIZE * 2*NUM_IR_DESC, &temp);
242 if (!aup->db[0].vaddr)
245 setup_hw_rings(aup, (u32)aup->rx_ring[0], (u32)aup->rx_ring[0] + 512);
249 for (i=0; i<(2*NUM_IR_DESC); i++) {
250 pDB->pnext = pDBfree;
253 (u32 *)((unsigned)aup->db[0].vaddr + MAX_BUF_SIZE*i);
254 pDB->dma_addr = (dma_addr_t)virt_to_bus(pDB->vaddr);
257 aup->pDBfree = pDBfree;
259 /* attach a data buffer to each descriptor */
260 for (i=0; i<NUM_IR_DESC; i++) {
261 pDB = GetFreeDB(aup);
263 aup->rx_ring[i]->addr_0 = (u8)(pDB->dma_addr & 0xff);
264 aup->rx_ring[i]->addr_1 = (u8)((pDB->dma_addr>>8) & 0xff);
265 aup->rx_ring[i]->addr_2 = (u8)((pDB->dma_addr>>16) & 0xff);
266 aup->rx_ring[i]->addr_3 = (u8)((pDB->dma_addr>>24) & 0xff);
267 aup->rx_db_inuse[i] = pDB;
269 for (i=0; i<NUM_IR_DESC; i++) {
270 pDB = GetFreeDB(aup);
272 aup->tx_ring[i]->addr_0 = (u8)(pDB->dma_addr & 0xff);
273 aup->tx_ring[i]->addr_1 = (u8)((pDB->dma_addr>>8) & 0xff);
274 aup->tx_ring[i]->addr_2 = (u8)((pDB->dma_addr>>16) & 0xff);
275 aup->tx_ring[i]->addr_3 = (u8)((pDB->dma_addr>>24) & 0xff);
276 aup->tx_ring[i]->count_0 = 0;
277 aup->tx_ring[i]->count_1 = 0;
278 aup->tx_ring[i]->flags = 0;
279 aup->tx_db_inuse[i] = pDB;
282 #if defined(CONFIG_MIPS_DB1000) || defined(CONFIG_MIPS_DB1100)
284 bcsr->resets &= ~BCSR_RESETS_IRDA_MODE_MASK;
285 bcsr->resets |= BCSR_RESETS_IRDA_MODE_FULL;
292 dma_free((void *)aup->rx_ring[0],
293 2 * MAX_NUM_IR_DESC*(sizeof(ring_dest_t)));
295 kfree(aup->rx_buff.head);
297 printk(KERN_ERR "au1k_init_module failed. Returns %d\n", retval);
302 static int au1k_init(struct net_device *dev)
304 struct au1k_private *aup = netdev_priv(dev);
309 /* bring the device out of reset */
310 control = 0xe; /* coherent, clock enable, one half system clock */
312 #ifndef CONFIG_CPU_LITTLE_ENDIAN
319 for (i=0; i<NUM_IR_DESC; i++) {
320 aup->rx_ring[i]->flags = AU_OWN;
323 writel(control, IR_INTERFACE_CONFIG);
326 writel(read_ir_reg(IR_ENABLE) & ~0x8000, IR_ENABLE); /* disable PHY */
329 writel(MAX_BUF_SIZE, IR_MAX_PKT_LEN);
331 ring_address = (u32)virt_to_phys((void *)aup->rx_ring[0]);
332 writel(ring_address >> 26, IR_RING_BASE_ADDR_H);
333 writel((ring_address >> 10) & 0xffff, IR_RING_BASE_ADDR_L);
335 writel(RING_SIZE_64<<8 | RING_SIZE_64<<12, IR_RING_SIZE);
337 writel(1<<2 | IR_ONE_PIN, IR_CONFIG_2); /* 48MHz */
338 writel(0, IR_RING_ADDR_CMPR);
340 au1k_irda_set_speed(dev, 9600);
344 static int au1k_irda_start(struct net_device *dev)
348 struct au1k_private *aup = netdev_priv(dev);
350 if ((retval = au1k_init(dev))) {
351 printk(KERN_ERR "%s: error in au1k_init\n", dev->name);
355 if ((retval = request_irq(AU1000_IRDA_TX_INT, &au1k_irda_interrupt,
356 0, dev->name, dev))) {
357 printk(KERN_ERR "%s: unable to get IRQ %d\n",
358 dev->name, dev->irq);
361 if ((retval = request_irq(AU1000_IRDA_RX_INT, &au1k_irda_interrupt,
362 0, dev->name, dev))) {
363 free_irq(AU1000_IRDA_TX_INT, dev);
364 printk(KERN_ERR "%s: unable to get IRQ %d\n",
365 dev->name, dev->irq);
369 /* Give self a hardware name */
370 sprintf(hwname, "Au1000 SIR/FIR");
371 aup->irlap = irlap_open(dev, &aup->qos, hwname);
372 netif_start_queue(dev);
374 writel(read_ir_reg(IR_CONFIG_2) | 1<<8, IR_CONFIG_2); /* int enable */
376 aup->timer.expires = RUN_AT((3*HZ));
377 aup->timer.data = (unsigned long)dev;
381 static int au1k_irda_stop(struct net_device *dev)
383 struct au1k_private *aup = netdev_priv(dev);
385 /* disable interrupts */
386 writel(read_ir_reg(IR_CONFIG_2) & ~(1<<8), IR_CONFIG_2);
387 writel(0, IR_CONFIG_1);
388 writel(0, IR_INTERFACE_CONFIG); /* disable clock */
392 irlap_close(aup->irlap);
396 netif_stop_queue(dev);
397 del_timer(&aup->timer);
399 /* disable the interrupt */
400 free_irq(AU1000_IRDA_TX_INT, dev);
401 free_irq(AU1000_IRDA_RX_INT, dev);
405 static void __exit au1k_irda_exit(void)
407 struct net_device *dev = ir_devs[0];
408 struct au1k_private *aup = netdev_priv(dev);
410 unregister_netdev(dev);
412 dma_free((void *)aup->db[0].vaddr,
413 MAX_BUF_SIZE * 2*NUM_IR_DESC);
414 dma_free((void *)aup->rx_ring[0],
415 2 * MAX_NUM_IR_DESC*(sizeof(ring_dest_t)));
416 kfree(aup->rx_buff.head);
422 update_tx_stats(struct net_device *dev, u32 status, u32 pkt_len)
424 struct au1k_private *aup = netdev_priv(dev);
425 struct net_device_stats *ps = &aup->stats;
428 ps->tx_bytes += pkt_len;
430 if (status & IR_TX_ERROR) {
432 ps->tx_aborted_errors++;
437 static void au1k_tx_ack(struct net_device *dev)
439 struct au1k_private *aup = netdev_priv(dev);
440 volatile ring_dest_t *ptxd;
442 ptxd = aup->tx_ring[aup->tx_tail];
443 while (!(ptxd->flags & AU_OWN) && (aup->tx_tail != aup->tx_head)) {
444 update_tx_stats(dev, ptxd->flags,
445 ptxd->count_1<<8 | ptxd->count_0);
450 aup->tx_tail = (aup->tx_tail + 1) & (NUM_IR_DESC - 1);
451 ptxd = aup->tx_ring[aup->tx_tail];
455 netif_wake_queue(dev);
459 if (aup->tx_tail == aup->tx_head) {
461 au1k_irda_set_speed(dev, aup->newspeed);
465 writel(read_ir_reg(IR_CONFIG_1) & ~IR_TX_ENABLE,
468 writel(read_ir_reg(IR_CONFIG_1) | IR_RX_ENABLE,
470 writel(0, IR_RING_PROMPT);
478 * Au1000 transmit routine.
480 static int au1k_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev)
482 struct au1k_private *aup = netdev_priv(dev);
483 int speed = irda_get_next_speed(skb);
484 volatile ring_dest_t *ptxd;
490 if (speed != aup->speed && speed != -1) {
491 aup->newspeed = speed;
494 if ((skb->len == 0) && (aup->newspeed)) {
495 if (aup->tx_tail == aup->tx_head) {
496 au1k_irda_set_speed(dev, speed);
503 ptxd = aup->tx_ring[aup->tx_head];
506 if (flags & AU_OWN) {
507 printk(KERN_DEBUG "%s: tx_full\n", dev->name);
508 netif_stop_queue(dev);
512 else if (((aup->tx_head + 1) & (NUM_IR_DESC - 1)) == aup->tx_tail) {
513 printk(KERN_DEBUG "%s: tx_full\n", dev->name);
514 netif_stop_queue(dev);
519 pDB = aup->tx_db_inuse[aup->tx_head];
522 if (read_ir_reg(IR_RX_BYTE_CNT) != 0) {
523 printk("tx warning: rx byte cnt %x\n",
524 read_ir_reg(IR_RX_BYTE_CNT));
528 if (aup->speed == 4000000) {
530 memcpy((void *)pDB->vaddr, skb->data, skb->len);
531 ptxd->count_0 = skb->len & 0xff;
532 ptxd->count_1 = (skb->len >> 8) & 0xff;
537 len = async_wrap_skb(skb, (u8 *)pDB->vaddr, MAX_BUF_SIZE);
538 ptxd->count_0 = len & 0xff;
539 ptxd->count_1 = (len >> 8) & 0xff;
540 ptxd->flags |= IR_DIS_CRC;
541 au_writel(au_readl(0xae00000c) & ~(1<<13), 0xae00000c);
543 ptxd->flags |= AU_OWN;
546 writel(read_ir_reg(IR_CONFIG_1) | IR_TX_ENABLE, IR_CONFIG_1);
547 writel(0, IR_RING_PROMPT);
551 aup->tx_head = (aup->tx_head + 1) & (NUM_IR_DESC - 1);
552 dev->trans_start = jiffies;
558 update_rx_stats(struct net_device *dev, u32 status, u32 count)
560 struct au1k_private *aup = netdev_priv(dev);
561 struct net_device_stats *ps = &aup->stats;
565 if (status & IR_RX_ERROR) {
567 if (status & (IR_PHY_ERROR|IR_FIFO_OVER))
568 ps->rx_missed_errors++;
569 if (status & IR_MAX_LEN)
570 ps->rx_length_errors++;
571 if (status & IR_CRC_ERROR)
575 ps->rx_bytes += count;
579 * Au1000 receive routine.
581 static int au1k_irda_rx(struct net_device *dev)
583 struct au1k_private *aup = netdev_priv(dev);
585 volatile ring_dest_t *prxd;
589 prxd = aup->rx_ring[aup->rx_head];
592 while (!(flags & AU_OWN)) {
593 pDB = aup->rx_db_inuse[aup->rx_head];
594 count = prxd->count_1<<8 | prxd->count_0;
595 if (!(flags & IR_RX_ERROR)) {
597 update_rx_stats(dev, flags, count);
598 skb=alloc_skb(count+1,GFP_ATOMIC);
600 aup->stats.rx_dropped++;
604 if (aup->speed == 4000000)
607 skb_put(skb, count-2);
608 memcpy(skb->data, (void *)pDB->vaddr, count-2);
610 skb->mac.raw = skb->data;
611 skb->protocol = htons(ETH_P_IRDA);
616 prxd->flags |= AU_OWN;
617 aup->rx_head = (aup->rx_head + 1) & (NUM_IR_DESC - 1);
618 writel(0, IR_RING_PROMPT);
621 /* next descriptor */
622 prxd = aup->rx_ring[aup->rx_head];
624 dev->last_rx = jiffies;
631 void au1k_irda_interrupt(int irq, void *dev_id, struct pt_regs *regs)
633 struct net_device *dev = (struct net_device *) dev_id;
636 printk(KERN_ERR "%s: isr: null dev ptr\n", dev->name);
640 writel(0, IR_INT_CLEAR); /* ack irda interrupts */
648 * The Tx ring has been full longer than the watchdog timeout
649 * value. The transmitter must be hung?
651 static void au1k_tx_timeout(struct net_device *dev)
654 struct au1k_private *aup = netdev_priv(dev);
656 printk(KERN_ERR "%s: tx timeout\n", dev->name);
659 au1k_irda_set_speed(dev, speed);
661 netif_wake_queue(dev);
666 * Set the IrDA communications speed.
669 au1k_irda_set_speed(struct net_device *dev, int speed)
672 struct au1k_private *aup = netdev_priv(dev);
674 int ret = 0, timeout = 10, i;
675 volatile ring_dest_t *ptxd;
676 #if defined(CONFIG_MIPS_DB1000) || defined(CONFIG_MIPS_DB1100)
677 unsigned long irda_resets;
680 if (speed == aup->speed)
683 spin_lock_irqsave(&ir_lock, flags);
685 /* disable PHY first */
686 writel(read_ir_reg(IR_ENABLE) & ~0x8000, IR_ENABLE);
689 writel(read_ir_reg(IR_CONFIG_1) & ~(IR_RX_ENABLE|IR_TX_ENABLE),
692 while (read_ir_reg(IR_ENABLE) & (IR_RX_STATUS | IR_TX_STATUS)) {
695 printk(KERN_ERR "%s: rx/tx disable timeout\n",
702 writel(read_ir_reg(IR_CONFIG_1) & ~IR_DMA_ENABLE, IR_CONFIG_1);
706 * After we disable tx/rx. the index pointers
709 aup->tx_head = aup->tx_tail = aup->rx_head = 0;
710 for (i=0; i<NUM_IR_DESC; i++) {
711 ptxd = aup->tx_ring[i];
717 for (i=0; i<NUM_IR_DESC; i++) {
718 ptxd = aup->rx_ring[i];
721 ptxd->flags = AU_OWN;
724 if (speed == 4000000) {
725 #if defined(CONFIG_MIPS_DB1000) || defined(CONFIG_MIPS_DB1100)
726 bcsr->resets |= BCSR_RESETS_FIR_SEL;
727 #else /* Pb1000 and Pb1100 */
728 writel(1<<13, CPLD_AUX1);
732 #if defined(CONFIG_MIPS_DB1000) || defined(CONFIG_MIPS_DB1100)
733 bcsr->resets &= ~BCSR_RESETS_FIR_SEL;
734 #else /* Pb1000 and Pb1100 */
735 writel(readl(CPLD_AUX1) & ~(1<<13), CPLD_AUX1);
741 writel(11<<10 | 12<<5, IR_WRITE_PHY_CONFIG);
742 writel(IR_SIR_MODE, IR_CONFIG_1);
745 writel(5<<10 | 12<<5, IR_WRITE_PHY_CONFIG);
746 writel(IR_SIR_MODE, IR_CONFIG_1);
749 writel(2<<10 | 12<<5, IR_WRITE_PHY_CONFIG);
750 writel(IR_SIR_MODE, IR_CONFIG_1);
753 writel(1<<10 | 12<<5, IR_WRITE_PHY_CONFIG);
754 writel(IR_SIR_MODE, IR_CONFIG_1);
757 writel(12<<5, IR_WRITE_PHY_CONFIG);
758 writel(IR_SIR_MODE, IR_CONFIG_1);
761 writel(0xF, IR_WRITE_PHY_CONFIG);
762 writel(IR_FIR|IR_DMA_ENABLE|IR_RX_ENABLE, IR_CONFIG_1);
765 printk(KERN_ERR "%s unsupported speed %x\n", dev->name, speed);
771 writel(read_ir_reg(IR_ENABLE) | 0x8000, IR_ENABLE);
774 control = read_ir_reg(IR_ENABLE);
775 writel(0, IR_RING_PROMPT);
778 if (control & (1<<14)) {
779 printk(KERN_ERR "%s: configuration error\n", dev->name);
782 if (control & (1<<11))
783 printk(KERN_DEBUG "%s Valid SIR config\n", dev->name);
784 if (control & (1<<12))
785 printk(KERN_DEBUG "%s Valid MIR config\n", dev->name);
786 if (control & (1<<13))
787 printk(KERN_DEBUG "%s Valid FIR config\n", dev->name);
788 if (control & (1<<10))
789 printk(KERN_DEBUG "%s TX enabled\n", dev->name);
790 if (control & (1<<9))
791 printk(KERN_DEBUG "%s RX enabled\n", dev->name);
794 spin_unlock_irqrestore(&ir_lock, flags);
799 au1k_irda_ioctl(struct net_device *dev, struct ifreq *ifreq, int cmd)
801 struct if_irda_req *rq = (struct if_irda_req *)ifreq;
802 struct au1k_private *aup = netdev_priv(dev);
803 int ret = -EOPNOTSUPP;
807 if (capable(CAP_NET_ADMIN)) {
809 * We are unable to set the speed if the
810 * device is not running.
813 ret = au1k_irda_set_speed(dev,
816 printk(KERN_ERR "%s ioctl: !netif_running\n",
825 if (capable(CAP_NET_ADMIN)) {
826 irda_device_set_media_busy(dev, TRUE);
832 rq->ifr_receiving = 0;
841 static struct net_device_stats *au1k_irda_stats(struct net_device *dev)
843 struct au1k_private *aup = netdev_priv(dev);
847 MODULE_AUTHOR("Pete Popov <ppopov@mvista.com>");
848 MODULE_DESCRIPTION("Au1000 IrDA Device Driver");
850 module_init(au1k_irda_init);
851 module_exit(au1k_irda_exit);