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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/net/irda/au1k_ir.c
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Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'drivers/net/irda/au1k_ir.c')
-rw-r--r--drivers/net/irda/au1k_ir.c851
1 files changed, 851 insertions, 0 deletions
diff --git a/drivers/net/irda/au1k_ir.c b/drivers/net/irda/au1k_ir.c
new file mode 100644
index 000000000000..e6b1985767c2
--- /dev/null
+++ b/drivers/net/irda/au1k_ir.c
@@ -0,0 +1,851 @@
+/*
+ * Alchemy Semi Au1000 IrDA driver
+ *
+ * Copyright 2001 MontaVista Software Inc.
+ * Author: MontaVista Software, Inc.
+ * ppopov@mvista.com or source@mvista.com
+ *
+ * This program is free software; you can distribute it and/or modify it
+ * under the terms of the GNU General Public License (Version 2) as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ */
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/netdevice.h>
+#include <linux/slab.h>
+#include <linux/rtnetlink.h>
+#include <linux/interrupt.h>
+#include <linux/pm.h>
+#include <linux/bitops.h>
+
+#include <asm/irq.h>
+#include <asm/io.h>
+#include <asm/au1000.h>
+#if defined(CONFIG_MIPS_PB1000) || defined(CONFIG_MIPS_PB1100)
+#include <asm/pb1000.h>
+#elif defined(CONFIG_MIPS_DB1000) || defined(CONFIG_MIPS_DB1100)
+#include <asm/db1x00.h>
+#else
+#error au1k_ir: unsupported board
+#endif
+
+#include <net/irda/irda.h>
+#include <net/irda/irmod.h>
+#include <net/irda/wrapper.h>
+#include <net/irda/irda_device.h>
+#include "au1000_ircc.h"
+
+static int au1k_irda_net_init(struct net_device *);
+static int au1k_irda_start(struct net_device *);
+static int au1k_irda_stop(struct net_device *dev);
+static int au1k_irda_hard_xmit(struct sk_buff *, struct net_device *);
+static int au1k_irda_rx(struct net_device *);
+static void au1k_irda_interrupt(int, void *, struct pt_regs *);
+static void au1k_tx_timeout(struct net_device *);
+static struct net_device_stats *au1k_irda_stats(struct net_device *);
+static int au1k_irda_ioctl(struct net_device *, struct ifreq *, int);
+static int au1k_irda_set_speed(struct net_device *dev, int speed);
+
+static void *dma_alloc(size_t, dma_addr_t *);
+static void dma_free(void *, size_t);
+
+static int qos_mtt_bits = 0x07; /* 1 ms or more */
+static struct net_device *ir_devs[NUM_IR_IFF];
+static char version[] __devinitdata =
+ "au1k_ircc:1.2 ppopov@mvista.com\n";
+
+#define RUN_AT(x) (jiffies + (x))
+
+#if defined(CONFIG_MIPS_DB1000) || defined(CONFIG_MIPS_DB1100)
+static BCSR * const bcsr = (BCSR *)0xAE000000;
+#endif
+
+static DEFINE_SPINLOCK(ir_lock);
+
+/*
+ * IrDA peripheral bug. You have to read the register
+ * twice to get the right value.
+ */
+u32 read_ir_reg(u32 addr)
+{
+ readl(addr);
+ return readl(addr);
+}
+
+
+/*
+ * Buffer allocation/deallocation routines. The buffer descriptor returned
+ * has the virtual and dma address of a buffer suitable for
+ * both, receive and transmit operations.
+ */
+static db_dest_t *GetFreeDB(struct au1k_private *aup)
+{
+ db_dest_t *pDB;
+ pDB = aup->pDBfree;
+
+ if (pDB) {
+ aup->pDBfree = pDB->pnext;
+ }
+ return pDB;
+}
+
+static void ReleaseDB(struct au1k_private *aup, db_dest_t *pDB)
+{
+ db_dest_t *pDBfree = aup->pDBfree;
+ if (pDBfree)
+ pDBfree->pnext = pDB;
+ aup->pDBfree = pDB;
+}
+
+
+/*
+ DMA memory allocation, derived from pci_alloc_consistent.
+ However, the Au1000 data cache is coherent (when programmed
+ so), therefore we return KSEG0 address, not KSEG1.
+*/
+static void *dma_alloc(size_t size, dma_addr_t * dma_handle)
+{
+ void *ret;
+ int gfp = GFP_ATOMIC | GFP_DMA;
+
+ ret = (void *) __get_free_pages(gfp, get_order(size));
+
+ if (ret != NULL) {
+ memset(ret, 0, size);
+ *dma_handle = virt_to_bus(ret);
+ ret = (void *)KSEG0ADDR(ret);
+ }
+ return ret;
+}
+
+
+static void dma_free(void *vaddr, size_t size)
+{
+ vaddr = (void *)KSEG0ADDR(vaddr);
+ free_pages((unsigned long) vaddr, get_order(size));
+}
+
+
+static void
+setup_hw_rings(struct au1k_private *aup, u32 rx_base, u32 tx_base)
+{
+ int i;
+ for (i=0; i<NUM_IR_DESC; i++) {
+ aup->rx_ring[i] = (volatile ring_dest_t *)
+ (rx_base + sizeof(ring_dest_t)*i);
+ }
+ for (i=0; i<NUM_IR_DESC; i++) {
+ aup->tx_ring[i] = (volatile ring_dest_t *)
+ (tx_base + sizeof(ring_dest_t)*i);
+ }
+}
+
+static int au1k_irda_init(void)
+{
+ static unsigned version_printed = 0;
+ struct au1k_private *aup;
+ struct net_device *dev;
+ int err;
+
+ if (version_printed++ == 0) printk(version);
+
+ dev = alloc_irdadev(sizeof(struct au1k_private));
+ if (!dev)
+ return -ENOMEM;
+
+ dev->irq = AU1000_IRDA_RX_INT; /* TX has its own interrupt */
+ err = au1k_irda_net_init(dev);
+ if (err)
+ goto out;
+ err = register_netdev(dev);
+ if (err)
+ goto out1;
+ ir_devs[0] = dev;
+ printk(KERN_INFO "IrDA: Registered device %s\n", dev->name);
+ return 0;
+
+out1:
+ aup = netdev_priv(dev);
+ dma_free((void *)aup->db[0].vaddr,
+ MAX_BUF_SIZE * 2*NUM_IR_DESC);
+ dma_free((void *)aup->rx_ring[0],
+ 2 * MAX_NUM_IR_DESC*(sizeof(ring_dest_t)));
+ kfree(aup->rx_buff.head);
+out:
+ free_netdev(dev);
+ return err;
+}
+
+static int au1k_irda_init_iobuf(iobuff_t *io, int size)
+{
+ io->head = kmalloc(size, GFP_KERNEL);
+ if (io->head != NULL) {
+ io->truesize = size;
+ io->in_frame = FALSE;
+ io->state = OUTSIDE_FRAME;
+ io->data = io->head;
+ }
+ return io->head ? 0 : -ENOMEM;
+}
+
+static int au1k_irda_net_init(struct net_device *dev)
+{
+ struct au1k_private *aup = netdev_priv(dev);
+ int i, retval = 0, err;
+ db_dest_t *pDB, *pDBfree;
+ dma_addr_t temp;
+
+ err = au1k_irda_init_iobuf(&aup->rx_buff, 14384);
+ if (err)
+ goto out1;
+
+ dev->open = au1k_irda_start;
+ dev->hard_start_xmit = au1k_irda_hard_xmit;
+ dev->stop = au1k_irda_stop;
+ dev->get_stats = au1k_irda_stats;
+ dev->do_ioctl = au1k_irda_ioctl;
+ dev->tx_timeout = au1k_tx_timeout;
+
+ irda_init_max_qos_capabilies(&aup->qos);
+
+ /* The only value we must override it the baudrate */
+ aup->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|
+ IR_115200|IR_576000 |(IR_4000000 << 8);
+
+ aup->qos.min_turn_time.bits = qos_mtt_bits;
+ irda_qos_bits_to_value(&aup->qos);
+
+ retval = -ENOMEM;
+
+ /* Tx ring follows rx ring + 512 bytes */
+ /* we need a 1k aligned buffer */
+ aup->rx_ring[0] = (ring_dest_t *)
+ dma_alloc(2*MAX_NUM_IR_DESC*(sizeof(ring_dest_t)), &temp);
+ if (!aup->rx_ring[0])
+ goto out2;
+
+ /* allocate the data buffers */
+ aup->db[0].vaddr =
+ (void *)dma_alloc(MAX_BUF_SIZE * 2*NUM_IR_DESC, &temp);
+ if (!aup->db[0].vaddr)
+ goto out3;
+
+ setup_hw_rings(aup, (u32)aup->rx_ring[0], (u32)aup->rx_ring[0] + 512);
+
+ pDBfree = NULL;
+ pDB = aup->db;
+ for (i=0; i<(2*NUM_IR_DESC); i++) {
+ pDB->pnext = pDBfree;
+ pDBfree = pDB;
+ pDB->vaddr =
+ (u32 *)((unsigned)aup->db[0].vaddr + MAX_BUF_SIZE*i);
+ pDB->dma_addr = (dma_addr_t)virt_to_bus(pDB->vaddr);
+ pDB++;
+ }
+ aup->pDBfree = pDBfree;
+
+ /* attach a data buffer to each descriptor */
+ for (i=0; i<NUM_IR_DESC; i++) {
+ pDB = GetFreeDB(aup);
+ if (!pDB) goto out;
+ aup->rx_ring[i]->addr_0 = (u8)(pDB->dma_addr & 0xff);
+ aup->rx_ring[i]->addr_1 = (u8)((pDB->dma_addr>>8) & 0xff);
+ aup->rx_ring[i]->addr_2 = (u8)((pDB->dma_addr>>16) & 0xff);
+ aup->rx_ring[i]->addr_3 = (u8)((pDB->dma_addr>>24) & 0xff);
+ aup->rx_db_inuse[i] = pDB;
+ }
+ for (i=0; i<NUM_IR_DESC; i++) {
+ pDB = GetFreeDB(aup);
+ if (!pDB) goto out;
+ aup->tx_ring[i]->addr_0 = (u8)(pDB->dma_addr & 0xff);
+ aup->tx_ring[i]->addr_1 = (u8)((pDB->dma_addr>>8) & 0xff);
+ aup->tx_ring[i]->addr_2 = (u8)((pDB->dma_addr>>16) & 0xff);
+ aup->tx_ring[i]->addr_3 = (u8)((pDB->dma_addr>>24) & 0xff);
+ aup->tx_ring[i]->count_0 = 0;
+ aup->tx_ring[i]->count_1 = 0;
+ aup->tx_ring[i]->flags = 0;
+ aup->tx_db_inuse[i] = pDB;
+ }
+
+#if defined(CONFIG_MIPS_DB1000) || defined(CONFIG_MIPS_DB1100)
+ /* power on */
+ bcsr->resets &= ~BCSR_RESETS_IRDA_MODE_MASK;
+ bcsr->resets |= BCSR_RESETS_IRDA_MODE_FULL;
+ au_sync();
+#endif
+
+ return 0;
+
+out3:
+ dma_free((void *)aup->rx_ring[0],
+ 2 * MAX_NUM_IR_DESC*(sizeof(ring_dest_t)));
+out2:
+ kfree(aup->rx_buff.head);
+out1:
+ printk(KERN_ERR "au1k_init_module failed. Returns %d\n", retval);
+ return retval;
+}
+
+
+static int au1k_init(struct net_device *dev)
+{
+ struct au1k_private *aup = netdev_priv(dev);
+ int i;
+ u32 control;
+ u32 ring_address;
+
+ /* bring the device out of reset */
+ control = 0xe; /* coherent, clock enable, one half system clock */
+
+#ifndef CONFIG_CPU_LITTLE_ENDIAN
+ control |= 1;
+#endif
+ aup->tx_head = 0;
+ aup->tx_tail = 0;
+ aup->rx_head = 0;
+
+ for (i=0; i<NUM_IR_DESC; i++) {
+ aup->rx_ring[i]->flags = AU_OWN;
+ }
+
+ writel(control, IR_INTERFACE_CONFIG);
+ au_sync_delay(10);
+
+ writel(read_ir_reg(IR_ENABLE) & ~0x8000, IR_ENABLE); /* disable PHY */
+ au_sync_delay(1);
+
+ writel(MAX_BUF_SIZE, IR_MAX_PKT_LEN);
+
+ ring_address = (u32)virt_to_phys((void *)aup->rx_ring[0]);
+ writel(ring_address >> 26, IR_RING_BASE_ADDR_H);
+ writel((ring_address >> 10) & 0xffff, IR_RING_BASE_ADDR_L);
+
+ writel(RING_SIZE_64<<8 | RING_SIZE_64<<12, IR_RING_SIZE);
+
+ writel(1<<2 | IR_ONE_PIN, IR_CONFIG_2); /* 48MHz */
+ writel(0, IR_RING_ADDR_CMPR);
+
+ au1k_irda_set_speed(dev, 9600);
+ return 0;
+}
+
+static int au1k_irda_start(struct net_device *dev)
+{
+ int retval;
+ char hwname[32];
+ struct au1k_private *aup = netdev_priv(dev);
+
+ if ((retval = au1k_init(dev))) {
+ printk(KERN_ERR "%s: error in au1k_init\n", dev->name);
+ return retval;
+ }
+
+ if ((retval = request_irq(AU1000_IRDA_TX_INT, &au1k_irda_interrupt,
+ 0, dev->name, dev))) {
+ printk(KERN_ERR "%s: unable to get IRQ %d\n",
+ dev->name, dev->irq);
+ return retval;
+ }
+ if ((retval = request_irq(AU1000_IRDA_RX_INT, &au1k_irda_interrupt,
+ 0, dev->name, dev))) {
+ free_irq(AU1000_IRDA_TX_INT, dev);
+ printk(KERN_ERR "%s: unable to get IRQ %d\n",
+ dev->name, dev->irq);
+ return retval;
+ }
+
+ /* Give self a hardware name */
+ sprintf(hwname, "Au1000 SIR/FIR");
+ aup->irlap = irlap_open(dev, &aup->qos, hwname);
+ netif_start_queue(dev);
+
+ writel(read_ir_reg(IR_CONFIG_2) | 1<<8, IR_CONFIG_2); /* int enable */
+
+ aup->timer.expires = RUN_AT((3*HZ));
+ aup->timer.data = (unsigned long)dev;
+ return 0;
+}
+
+static int au1k_irda_stop(struct net_device *dev)
+{
+ struct au1k_private *aup = netdev_priv(dev);
+
+ /* disable interrupts */
+ writel(read_ir_reg(IR_CONFIG_2) & ~(1<<8), IR_CONFIG_2);
+ writel(0, IR_CONFIG_1);
+ writel(0, IR_INTERFACE_CONFIG); /* disable clock */
+ au_sync();
+
+ if (aup->irlap) {
+ irlap_close(aup->irlap);
+ aup->irlap = NULL;
+ }
+
+ netif_stop_queue(dev);
+ del_timer(&aup->timer);
+
+ /* disable the interrupt */
+ free_irq(AU1000_IRDA_TX_INT, dev);
+ free_irq(AU1000_IRDA_RX_INT, dev);
+ return 0;
+}
+
+static void __exit au1k_irda_exit(void)
+{
+ struct net_device *dev = ir_devs[0];
+ struct au1k_private *aup = netdev_priv(dev);
+
+ unregister_netdev(dev);
+
+ dma_free((void *)aup->db[0].vaddr,
+ MAX_BUF_SIZE * 2*NUM_IR_DESC);
+ dma_free((void *)aup->rx_ring[0],
+ 2 * MAX_NUM_IR_DESC*(sizeof(ring_dest_t)));
+ kfree(aup->rx_buff.head);
+ free_netdev(dev);
+}
+
+
+static inline void
+update_tx_stats(struct net_device *dev, u32 status, u32 pkt_len)
+{
+ struct au1k_private *aup = netdev_priv(dev);
+ struct net_device_stats *ps = &aup->stats;
+
+ ps->tx_packets++;
+ ps->tx_bytes += pkt_len;
+
+ if (status & IR_TX_ERROR) {
+ ps->tx_errors++;
+ ps->tx_aborted_errors++;
+ }
+}
+
+
+static void au1k_tx_ack(struct net_device *dev)
+{
+ struct au1k_private *aup = netdev_priv(dev);
+ volatile ring_dest_t *ptxd;
+
+ ptxd = aup->tx_ring[aup->tx_tail];
+ while (!(ptxd->flags & AU_OWN) && (aup->tx_tail != aup->tx_head)) {
+ update_tx_stats(dev, ptxd->flags,
+ ptxd->count_1<<8 | ptxd->count_0);
+ ptxd->count_0 = 0;
+ ptxd->count_1 = 0;
+ au_sync();
+
+ aup->tx_tail = (aup->tx_tail + 1) & (NUM_IR_DESC - 1);
+ ptxd = aup->tx_ring[aup->tx_tail];
+
+ if (aup->tx_full) {
+ aup->tx_full = 0;
+ netif_wake_queue(dev);
+ }
+ }
+
+ if (aup->tx_tail == aup->tx_head) {
+ if (aup->newspeed) {
+ au1k_irda_set_speed(dev, aup->newspeed);
+ aup->newspeed = 0;
+ }
+ else {
+ writel(read_ir_reg(IR_CONFIG_1) & ~IR_TX_ENABLE,
+ IR_CONFIG_1);
+ au_sync();
+ writel(read_ir_reg(IR_CONFIG_1) | IR_RX_ENABLE,
+ IR_CONFIG_1);
+ writel(0, IR_RING_PROMPT);
+ au_sync();
+ }
+ }
+}
+
+
+/*
+ * Au1000 transmit routine.
+ */
+static int au1k_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev)
+{
+ struct au1k_private *aup = netdev_priv(dev);
+ int speed = irda_get_next_speed(skb);
+ volatile ring_dest_t *ptxd;
+ u32 len;
+
+ u32 flags;
+ db_dest_t *pDB;
+
+ if (speed != aup->speed && speed != -1) {
+ aup->newspeed = speed;
+ }
+
+ if ((skb->len == 0) && (aup->newspeed)) {
+ if (aup->tx_tail == aup->tx_head) {
+ au1k_irda_set_speed(dev, speed);
+ aup->newspeed = 0;
+ }
+ dev_kfree_skb(skb);
+ return 0;
+ }
+
+ ptxd = aup->tx_ring[aup->tx_head];
+ flags = ptxd->flags;
+
+ if (flags & AU_OWN) {
+ printk(KERN_DEBUG "%s: tx_full\n", dev->name);
+ netif_stop_queue(dev);
+ aup->tx_full = 1;
+ return 1;
+ }
+ else if (((aup->tx_head + 1) & (NUM_IR_DESC - 1)) == aup->tx_tail) {
+ printk(KERN_DEBUG "%s: tx_full\n", dev->name);
+ netif_stop_queue(dev);
+ aup->tx_full = 1;
+ return 1;
+ }
+
+ pDB = aup->tx_db_inuse[aup->tx_head];
+
+#if 0
+ if (read_ir_reg(IR_RX_BYTE_CNT) != 0) {
+ printk("tx warning: rx byte cnt %x\n",
+ read_ir_reg(IR_RX_BYTE_CNT));
+ }
+#endif
+
+ if (aup->speed == 4000000) {
+ /* FIR */
+ memcpy((void *)pDB->vaddr, skb->data, skb->len);
+ ptxd->count_0 = skb->len & 0xff;
+ ptxd->count_1 = (skb->len >> 8) & 0xff;
+
+ }
+ else {
+ /* SIR */
+ len = async_wrap_skb(skb, (u8 *)pDB->vaddr, MAX_BUF_SIZE);
+ ptxd->count_0 = len & 0xff;
+ ptxd->count_1 = (len >> 8) & 0xff;
+ ptxd->flags |= IR_DIS_CRC;
+ au_writel(au_readl(0xae00000c) & ~(1<<13), 0xae00000c);
+ }
+ ptxd->flags |= AU_OWN;
+ au_sync();
+
+ writel(read_ir_reg(IR_CONFIG_1) | IR_TX_ENABLE, IR_CONFIG_1);
+ writel(0, IR_RING_PROMPT);
+ au_sync();
+
+ dev_kfree_skb(skb);
+ aup->tx_head = (aup->tx_head + 1) & (NUM_IR_DESC - 1);
+ dev->trans_start = jiffies;
+ return 0;
+}
+
+
+static inline void
+update_rx_stats(struct net_device *dev, u32 status, u32 count)
+{
+ struct au1k_private *aup = netdev_priv(dev);
+ struct net_device_stats *ps = &aup->stats;
+
+ ps->rx_packets++;
+
+ if (status & IR_RX_ERROR) {
+ ps->rx_errors++;
+ if (status & (IR_PHY_ERROR|IR_FIFO_OVER))
+ ps->rx_missed_errors++;
+ if (status & IR_MAX_LEN)
+ ps->rx_length_errors++;
+ if (status & IR_CRC_ERROR)
+ ps->rx_crc_errors++;
+ }
+ else
+ ps->rx_bytes += count;
+}
+
+/*
+ * Au1000 receive routine.
+ */
+static int au1k_irda_rx(struct net_device *dev)
+{
+ struct au1k_private *aup = netdev_priv(dev);
+ struct sk_buff *skb;
+ volatile ring_dest_t *prxd;
+ u32 flags, count;
+ db_dest_t *pDB;
+
+ prxd = aup->rx_ring[aup->rx_head];
+ flags = prxd->flags;
+
+ while (!(flags & AU_OWN)) {
+ pDB = aup->rx_db_inuse[aup->rx_head];
+ count = prxd->count_1<<8 | prxd->count_0;
+ if (!(flags & IR_RX_ERROR)) {
+ /* good frame */
+ update_rx_stats(dev, flags, count);
+ skb=alloc_skb(count+1,GFP_ATOMIC);
+ if (skb == NULL) {
+ aup->stats.rx_dropped++;
+ continue;
+ }
+ skb_reserve(skb, 1);
+ if (aup->speed == 4000000)
+ skb_put(skb, count);
+ else
+ skb_put(skb, count-2);
+ memcpy(skb->data, (void *)pDB->vaddr, count-2);
+ skb->dev = dev;
+ skb->mac.raw = skb->data;
+ skb->protocol = htons(ETH_P_IRDA);
+ netif_rx(skb);
+ prxd->count_0 = 0;
+ prxd->count_1 = 0;
+ }
+ prxd->flags |= AU_OWN;
+ aup->rx_head = (aup->rx_head + 1) & (NUM_IR_DESC - 1);
+ writel(0, IR_RING_PROMPT);
+ au_sync();
+
+ /* next descriptor */
+ prxd = aup->rx_ring[aup->rx_head];
+ flags = prxd->flags;
+ dev->last_rx = jiffies;
+
+ }
+ return 0;
+}
+
+
+void au1k_irda_interrupt(int irq, void *dev_id, struct pt_regs *regs)
+{
+ struct net_device *dev = (struct net_device *) dev_id;
+
+ if (dev == NULL) {
+ printk(KERN_ERR "%s: isr: null dev ptr\n", dev->name);
+ return;
+ }
+
+ writel(0, IR_INT_CLEAR); /* ack irda interrupts */
+
+ au1k_irda_rx(dev);
+ au1k_tx_ack(dev);
+}
+
+
+/*
+ * The Tx ring has been full longer than the watchdog timeout
+ * value. The transmitter must be hung?
+ */
+static void au1k_tx_timeout(struct net_device *dev)
+{
+ u32 speed;
+ struct au1k_private *aup = netdev_priv(dev);
+
+ printk(KERN_ERR "%s: tx timeout\n", dev->name);
+ speed = aup->speed;
+ aup->speed = 0;
+ au1k_irda_set_speed(dev, speed);
+ aup->tx_full = 0;
+ netif_wake_queue(dev);
+}
+
+
+/*
+ * Set the IrDA communications speed.
+ */
+static int
+au1k_irda_set_speed(struct net_device *dev, int speed)
+{
+ unsigned long flags;
+ struct au1k_private *aup = netdev_priv(dev);
+ u32 control;
+ int ret = 0, timeout = 10, i;
+ volatile ring_dest_t *ptxd;
+#if defined(CONFIG_MIPS_DB1000) || defined(CONFIG_MIPS_DB1100)
+ unsigned long irda_resets;
+#endif
+
+ if (speed == aup->speed)
+ return ret;
+
+ spin_lock_irqsave(&ir_lock, flags);
+
+ /* disable PHY first */
+ writel(read_ir_reg(IR_ENABLE) & ~0x8000, IR_ENABLE);
+
+ /* disable RX/TX */
+ writel(read_ir_reg(IR_CONFIG_1) & ~(IR_RX_ENABLE|IR_TX_ENABLE),
+ IR_CONFIG_1);
+ au_sync_delay(1);
+ while (read_ir_reg(IR_ENABLE) & (IR_RX_STATUS | IR_TX_STATUS)) {
+ mdelay(1);
+ if (!timeout--) {
+ printk(KERN_ERR "%s: rx/tx disable timeout\n",
+ dev->name);
+ break;
+ }
+ }
+
+ /* disable DMA */
+ writel(read_ir_reg(IR_CONFIG_1) & ~IR_DMA_ENABLE, IR_CONFIG_1);
+ au_sync_delay(1);
+
+ /*
+ * After we disable tx/rx. the index pointers
+ * go back to zero.
+ */
+ aup->tx_head = aup->tx_tail = aup->rx_head = 0;
+ for (i=0; i<NUM_IR_DESC; i++) {
+ ptxd = aup->tx_ring[i];
+ ptxd->flags = 0;
+ ptxd->count_0 = 0;
+ ptxd->count_1 = 0;
+ }
+
+ for (i=0; i<NUM_IR_DESC; i++) {
+ ptxd = aup->rx_ring[i];
+ ptxd->count_0 = 0;
+ ptxd->count_1 = 0;
+ ptxd->flags = AU_OWN;
+ }
+
+ if (speed == 4000000) {
+#if defined(CONFIG_MIPS_DB1000) || defined(CONFIG_MIPS_DB1100)
+ bcsr->resets |= BCSR_RESETS_FIR_SEL;
+#else /* Pb1000 and Pb1100 */
+ writel(1<<13, CPLD_AUX1);
+#endif
+ }
+ else {
+#if defined(CONFIG_MIPS_DB1000) || defined(CONFIG_MIPS_DB1100)
+ bcsr->resets &= ~BCSR_RESETS_FIR_SEL;
+#else /* Pb1000 and Pb1100 */
+ writel(readl(CPLD_AUX1) & ~(1<<13), CPLD_AUX1);
+#endif
+ }
+
+ switch (speed) {
+ case 9600:
+ writel(11<<10 | 12<<5, IR_WRITE_PHY_CONFIG);
+ writel(IR_SIR_MODE, IR_CONFIG_1);
+ break;
+ case 19200:
+ writel(5<<10 | 12<<5, IR_WRITE_PHY_CONFIG);
+ writel(IR_SIR_MODE, IR_CONFIG_1);
+ break;
+ case 38400:
+ writel(2<<10 | 12<<5, IR_WRITE_PHY_CONFIG);
+ writel(IR_SIR_MODE, IR_CONFIG_1);
+ break;
+ case 57600:
+ writel(1<<10 | 12<<5, IR_WRITE_PHY_CONFIG);
+ writel(IR_SIR_MODE, IR_CONFIG_1);
+ break;
+ case 115200:
+ writel(12<<5, IR_WRITE_PHY_CONFIG);
+ writel(IR_SIR_MODE, IR_CONFIG_1);
+ break;
+ case 4000000:
+ writel(0xF, IR_WRITE_PHY_CONFIG);
+ writel(IR_FIR|IR_DMA_ENABLE|IR_RX_ENABLE, IR_CONFIG_1);
+ break;
+ default:
+ printk(KERN_ERR "%s unsupported speed %x\n", dev->name, speed);
+ ret = -EINVAL;
+ break;
+ }
+
+ aup->speed = speed;
+ writel(read_ir_reg(IR_ENABLE) | 0x8000, IR_ENABLE);
+ au_sync();
+
+ control = read_ir_reg(IR_ENABLE);
+ writel(0, IR_RING_PROMPT);
+ au_sync();
+
+ if (control & (1<<14)) {
+ printk(KERN_ERR "%s: configuration error\n", dev->name);
+ }
+ else {
+ if (control & (1<<11))
+ printk(KERN_DEBUG "%s Valid SIR config\n", dev->name);
+ if (control & (1<<12))
+ printk(KERN_DEBUG "%s Valid MIR config\n", dev->name);
+ if (control & (1<<13))
+ printk(KERN_DEBUG "%s Valid FIR config\n", dev->name);
+ if (control & (1<<10))
+ printk(KERN_DEBUG "%s TX enabled\n", dev->name);
+ if (control & (1<<9))
+ printk(KERN_DEBUG "%s RX enabled\n", dev->name);
+ }
+
+ spin_unlock_irqrestore(&ir_lock, flags);
+ return ret;
+}
+
+static int
+au1k_irda_ioctl(struct net_device *dev, struct ifreq *ifreq, int cmd)
+{
+ struct if_irda_req *rq = (struct if_irda_req *)ifreq;
+ struct au1k_private *aup = netdev_priv(dev);
+ int ret = -EOPNOTSUPP;
+
+ switch (cmd) {
+ case SIOCSBANDWIDTH:
+ if (capable(CAP_NET_ADMIN)) {
+ /*
+ * We are unable to set the speed if the
+ * device is not running.
+ */
+ if (aup->open)
+ ret = au1k_irda_set_speed(dev,
+ rq->ifr_baudrate);
+ else {
+ printk(KERN_ERR "%s ioctl: !netif_running\n",
+ dev->name);
+ ret = 0;
+ }
+ }
+ break;
+
+ case SIOCSMEDIABUSY:
+ ret = -EPERM;
+ if (capable(CAP_NET_ADMIN)) {
+ irda_device_set_media_busy(dev, TRUE);
+ ret = 0;
+ }
+ break;
+
+ case SIOCGRECEIVING:
+ rq->ifr_receiving = 0;
+ break;
+ default:
+ break;
+ }
+ return ret;
+}
+
+
+static struct net_device_stats *au1k_irda_stats(struct net_device *dev)
+{
+ struct au1k_private *aup = netdev_priv(dev);
+ return &aup->stats;
+}
+
+MODULE_AUTHOR("Pete Popov <ppopov@mvista.com>");
+MODULE_DESCRIPTION("Au1000 IrDA Device Driver");
+
+module_init(au1k_irda_init);
+module_exit(au1k_irda_exit);