--- /dev/null
+/*
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/interrupt.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+#include <linux/ioport.h>
+
+#include <net/irda/irda.h>
+#include <net/irda/irmod.h>
+#include <net/irda/wrapper.h>
+#include <net/irda/irda_device.h>
+#include <asm/mach-au1x00/au1000.h>
+
+/* registers */
+#define IR_RING_PTR_STATUS 0x00
+#define IR_RING_BASE_ADDR_H 0x04
+#define IR_RING_BASE_ADDR_L 0x08
+#define IR_RING_SIZE 0x0C
+#define IR_RING_PROMPT 0x10
+#define IR_RING_ADDR_CMPR 0x14
+#define IR_INT_CLEAR 0x18
+#define IR_CONFIG_1 0x20
+#define IR_SIR_FLAGS 0x24
+#define IR_STATUS 0x28
+#define IR_READ_PHY_CONFIG 0x2C
+#define IR_WRITE_PHY_CONFIG 0x30
+#define IR_MAX_PKT_LEN 0x34
+#define IR_RX_BYTE_CNT 0x38
+#define IR_CONFIG_2 0x3C
+#define IR_ENABLE 0x40
+
+/* Config1 */
+#define IR_RX_INVERT_LED (1 << 0)
+#define IR_TX_INVERT_LED (1 << 1)
+#define IR_ST (1 << 2)
+#define IR_SF (1 << 3)
+#define IR_SIR (1 << 4)
+#define IR_MIR (1 << 5)
+#define IR_FIR (1 << 6)
+#define IR_16CRC (1 << 7)
+#define IR_TD (1 << 8)
+#define IR_RX_ALL (1 << 9)
+#define IR_DMA_ENABLE (1 << 10)
+#define IR_RX_ENABLE (1 << 11)
+#define IR_TX_ENABLE (1 << 12)
+#define IR_LOOPBACK (1 << 14)
+#define IR_SIR_MODE (IR_SIR | IR_DMA_ENABLE | \
+ IR_RX_ALL | IR_RX_ENABLE | IR_SF | \
+ IR_16CRC)
+
+/* ir_status */
+#define IR_RX_STATUS (1 << 9)
+#define IR_TX_STATUS (1 << 10)
+#define IR_PHYEN (1 << 15)
+
+/* ir_write_phy_config */
+#define IR_BR(x) (((x) & 0x3f) << 10) /* baud rate */
+#define IR_PW(x) (((x) & 0x1f) << 5) /* pulse width */
+#define IR_P(x) ((x) & 0x1f) /* preamble bits */
+
+/* Config2 */
+#define IR_MODE_INV (1 << 0)
+#define IR_ONE_PIN (1 << 1)
+#define IR_PHYCLK_40MHZ (0 << 2)
+#define IR_PHYCLK_48MHZ (1 << 2)
+#define IR_PHYCLK_56MHZ (2 << 2)
+#define IR_PHYCLK_64MHZ (3 << 2)
+#define IR_DP (1 << 4)
+#define IR_DA (1 << 5)
+#define IR_FLT_HIGH (0 << 6)
+#define IR_FLT_MEDHI (1 << 6)
+#define IR_FLT_MEDLO (2 << 6)
+#define IR_FLT_LO (3 << 6)
+#define IR_IEN (1 << 8)
+
+/* ir_enable */
+#define IR_HC (1 << 3) /* divide SBUS clock by 2 */
+#define IR_CE (1 << 2) /* clock enable */
+#define IR_C (1 << 1) /* coherency bit */
+#define IR_BE (1 << 0) /* set in big endian mode */
+
+#define NUM_IR_DESC 64
+#define RING_SIZE_4 0x0
+#define RING_SIZE_16 0x3
+#define RING_SIZE_64 0xF
+#define MAX_NUM_IR_DESC 64
+#define MAX_BUF_SIZE 2048
+
+/* Ring descriptor flags */
+#define AU_OWN (1 << 7) /* tx,rx */
+#define IR_DIS_CRC (1 << 6) /* tx */
+#define IR_BAD_CRC (1 << 5) /* tx */
+#define IR_NEED_PULSE (1 << 4) /* tx */
+#define IR_FORCE_UNDER (1 << 3) /* tx */
+#define IR_DISABLE_TX (1 << 2) /* tx */
+#define IR_HW_UNDER (1 << 0) /* tx */
+#define IR_TX_ERROR (IR_DIS_CRC | IR_BAD_CRC | IR_HW_UNDER)
+
+#define IR_PHY_ERROR (1 << 6) /* rx */
+#define IR_CRC_ERROR (1 << 5) /* rx */
+#define IR_MAX_LEN (1 << 4) /* rx */
+#define IR_FIFO_OVER (1 << 3) /* rx */
+#define IR_SIR_ERROR (1 << 2) /* rx */
+#define IR_RX_ERROR (IR_PHY_ERROR | IR_CRC_ERROR | \
+ IR_MAX_LEN | IR_FIFO_OVER | IR_SIR_ERROR)
+
+struct db_dest {
+ struct db_dest *pnext;
+ volatile u32 *vaddr;
+ dma_addr_t dma_addr;
+};
+
+struct ring_dest {
+ u8 count_0; /* 7:0 */
+ u8 count_1; /* 12:8 */
+ u8 reserved;
+ u8 flags;
+ u8 addr_0; /* 7:0 */
+ u8 addr_1; /* 15:8 */
+ u8 addr_2; /* 23:16 */
+ u8 addr_3; /* 31:24 */
+};
+
+/* Private data for each instance */
+struct au1k_private {
+ void __iomem *iobase;
+ int irq_rx, irq_tx;
+
+ struct db_dest *pDBfree;
+ struct db_dest db[2 * NUM_IR_DESC];
+ volatile struct ring_dest *rx_ring[NUM_IR_DESC];
+ volatile struct ring_dest *tx_ring[NUM_IR_DESC];
+ struct db_dest *rx_db_inuse[NUM_IR_DESC];
+ struct db_dest *tx_db_inuse[NUM_IR_DESC];
+ u32 rx_head;
+ u32 tx_head;
+ u32 tx_tail;
+ u32 tx_full;
+
+ iobuff_t rx_buff;
+
+ struct net_device *netdev;
+ struct qos_info qos;
+ struct irlap_cb *irlap;
+
+ u8 open;
+ u32 speed;
+ u32 newspeed;
+
+ struct timer_list timer;
+
+ struct resource *ioarea;
+ struct au1k_irda_platform_data *platdata;
+ struct clk *irda_clk;
+};
+
+static int qos_mtt_bits = 0x07; /* 1 ms or more */
+
+#define RUN_AT(x) (jiffies + (x))
+
+static void au1k_irda_plat_set_phy_mode(struct au1k_private *p, int mode)
+{
+ if (p->platdata && p->platdata->set_phy_mode)
+ p->platdata->set_phy_mode(mode);
+}
+
+static inline unsigned long irda_read(struct au1k_private *p,
+ unsigned long ofs)
+{
+ /*
+ * IrDA peripheral bug. You have to read the register
+ * twice to get the right value.
+ */
+ (void)__raw_readl(p->iobase + ofs);
+ return __raw_readl(p->iobase + ofs);
+}
+
+static inline void irda_write(struct au1k_private *p, unsigned long ofs,
+ unsigned long val)
+{
+ __raw_writel(val, p->iobase + ofs);
+ wmb();
+}
+
+/*
+ * 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 struct db_dest *GetFreeDB(struct au1k_private *aup)
+{
+ struct db_dest *db;
+ db = aup->pDBfree;
+
+ if (db)
+ aup->pDBfree = db->pnext;
+ return db;
+}
+
+/*
+ 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 struct ring_dest *)
+ (rx_base + sizeof(struct ring_dest) * i);
+ }
+ for (i = 0; i < NUM_IR_DESC; i++) {
+ aup->tx_ring[i] = (volatile struct ring_dest *)
+ (tx_base + sizeof(struct ring_dest) * i);
+ }
+}
+
+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;
+}
+
+/*
+ * Set the IrDA communications speed.
+ */
+static int au1k_irda_set_speed(struct net_device *dev, int speed)
+{
+ struct au1k_private *aup = netdev_priv(dev);
+ volatile struct ring_dest *ptxd;
+ unsigned long control;
+ int ret = 0, timeout = 10, i;
+
+ if (speed == aup->speed)
+ return ret;
+
+ /* disable PHY first */
+ au1k_irda_plat_set_phy_mode(aup, AU1000_IRDA_PHY_MODE_OFF);
+ irda_write(aup, IR_STATUS, irda_read(aup, IR_STATUS) & ~IR_PHYEN);
+
+ /* disable RX/TX */
+ irda_write(aup, IR_CONFIG_1,
+ irda_read(aup, IR_CONFIG_1) & ~(IR_RX_ENABLE | IR_TX_ENABLE));
+ msleep(20);
+ while (irda_read(aup, IR_STATUS) & (IR_RX_STATUS | IR_TX_STATUS)) {
+ msleep(20);
+ if (!timeout--) {
+ printk(KERN_ERR "%s: rx/tx disable timeout\n",
+ dev->name);
+ break;
+ }
+ }
+
+ /* disable DMA */
+ irda_write(aup, IR_CONFIG_1,
+ irda_read(aup, IR_CONFIG_1) & ~IR_DMA_ENABLE);
+ msleep(20);
+
+ /* 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)
+ au1k_irda_plat_set_phy_mode(aup, AU1000_IRDA_PHY_MODE_FIR);
+ else
+ au1k_irda_plat_set_phy_mode(aup, AU1000_IRDA_PHY_MODE_SIR);
+
+ switch (speed) {
+ case 9600:
+ irda_write(aup, IR_WRITE_PHY_CONFIG, IR_BR(11) | IR_PW(12));
+ irda_write(aup, IR_CONFIG_1, IR_SIR_MODE);
+ break;
+ case 19200:
+ irda_write(aup, IR_WRITE_PHY_CONFIG, IR_BR(5) | IR_PW(12));
+ irda_write(aup, IR_CONFIG_1, IR_SIR_MODE);
+ break;
+ case 38400:
+ irda_write(aup, IR_WRITE_PHY_CONFIG, IR_BR(2) | IR_PW(12));
+ irda_write(aup, IR_CONFIG_1, IR_SIR_MODE);
+ break;
+ case 57600:
+ irda_write(aup, IR_WRITE_PHY_CONFIG, IR_BR(1) | IR_PW(12));
+ irda_write(aup, IR_CONFIG_1, IR_SIR_MODE);
+ break;
+ case 115200:
+ irda_write(aup, IR_WRITE_PHY_CONFIG, IR_PW(12));
+ irda_write(aup, IR_CONFIG_1, IR_SIR_MODE);
+ break;
+ case 4000000:
+ irda_write(aup, IR_WRITE_PHY_CONFIG, IR_P(15));
+ irda_write(aup, IR_CONFIG_1, IR_FIR | IR_DMA_ENABLE |
+ IR_RX_ENABLE);
+ break;
+ default:
+ printk(KERN_ERR "%s unsupported speed %x\n", dev->name, speed);
+ ret = -EINVAL;
+ break;
+ }
+
+ aup->speed = speed;
+ irda_write(aup, IR_STATUS, irda_read(aup, IR_STATUS) | IR_PHYEN);
+
+ control = irda_read(aup, IR_STATUS);
+ irda_write(aup, IR_RING_PROMPT, 0);
+
+ 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);
+ }
+
+ return ret;
+}
+
+static void update_rx_stats(struct net_device *dev, u32 status, u32 count)
+{
+ struct net_device_stats *ps = &dev->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;
+}
+
+static void update_tx_stats(struct net_device *dev, u32 status, u32 pkt_len)
+{
+ struct net_device_stats *ps = &dev->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 struct ring_dest *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;
+ wmb();
+ 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 {
+ irda_write(aup, IR_CONFIG_1,
+ irda_read(aup, IR_CONFIG_1) & ~IR_TX_ENABLE);
+ irda_write(aup, IR_CONFIG_1,
+ irda_read(aup, IR_CONFIG_1) | IR_RX_ENABLE);
+ irda_write(aup, IR_RING_PROMPT, 0);
+ }
+ }
+}
+
+static int au1k_irda_rx(struct net_device *dev)
+{
+ struct au1k_private *aup = netdev_priv(dev);
+ volatile struct ring_dest *prxd;
+ struct sk_buff *skb;
+ struct db_dest *pDB;
+ u32 flags, count;
+
+ 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) {
+ dev->stats.rx_dropped++;
+ continue;
+ }
+ skb_reserve(skb, 1);
+ if (aup->speed == 4000000)
+ skb_put(skb, count);
+ else
+ skb_put(skb, count - 2);
+ skb_copy_to_linear_data(skb, (void *)pDB->vaddr,
+ count - 2);
+ skb->dev = dev;
+ skb_reset_mac_header(skb);
+ 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);
+ irda_write(aup, IR_RING_PROMPT, 0);
+
+ /* next descriptor */
+ prxd = aup->rx_ring[aup->rx_head];
+ flags = prxd->flags;
+
+ }
+ return 0;
+}
+
+static irqreturn_t au1k_irda_interrupt(int dummy, void *dev_id)
+{
+ struct net_device *dev = dev_id;
+ struct au1k_private *aup = netdev_priv(dev);
+
+ irda_write(aup, IR_INT_CLEAR, 0); /* ack irda interrupts */
+
+ au1k_irda_rx(dev);
+ au1k_tx_ack(dev);
+
+ return IRQ_HANDLED;
+}
+
+static int au1k_init(struct net_device *dev)
+{
+ struct au1k_private *aup = netdev_priv(dev);
+ u32 enable, ring_address, phyck;
+ struct clk *c;
+ int i;
+
+ c = clk_get(NULL, "irda_clk");
+ if (IS_ERR(c))
+ return PTR_ERR(c);
+ i = clk_prepare_enable(c);
+ if (i) {
+ clk_put(c);
+ return i;
+ }
+
+ switch (clk_get_rate(c)) {
+ case 40000000:
+ phyck = IR_PHYCLK_40MHZ;
+ break;
+ case 48000000:
+ phyck = IR_PHYCLK_48MHZ;
+ break;
+ case 56000000:
+ phyck = IR_PHYCLK_56MHZ;
+ break;
+ case 64000000:
+ phyck = IR_PHYCLK_64MHZ;
+ break;
+ default:
+ clk_disable_unprepare(c);
+ clk_put(c);
+ return -EINVAL;
+ }
+ aup->irda_clk = c;
+
+ enable = IR_HC | IR_CE | IR_C;
+#ifndef CONFIG_CPU_LITTLE_ENDIAN
+ enable |= IR_BE;
+#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;
+
+ irda_write(aup, IR_ENABLE, enable);
+ msleep(20);
+
+ /* disable PHY */
+ au1k_irda_plat_set_phy_mode(aup, AU1000_IRDA_PHY_MODE_OFF);
+ irda_write(aup, IR_STATUS, irda_read(aup, IR_STATUS) & ~IR_PHYEN);
+ msleep(20);
+
+ irda_write(aup, IR_MAX_PKT_LEN, MAX_BUF_SIZE);
+
+ ring_address = (u32)virt_to_phys((void *)aup->rx_ring[0]);
+ irda_write(aup, IR_RING_BASE_ADDR_H, ring_address >> 26);
+ irda_write(aup, IR_RING_BASE_ADDR_L, (ring_address >> 10) & 0xffff);
+
+ irda_write(aup, IR_RING_SIZE,
+ (RING_SIZE_64 << 8) | (RING_SIZE_64 << 12));
+
+ irda_write(aup, IR_CONFIG_2, phyck | IR_ONE_PIN);
+ irda_write(aup, IR_RING_ADDR_CMPR, 0);
+
+ au1k_irda_set_speed(dev, 9600);
+ return 0;
+}
+
+static int au1k_irda_start(struct net_device *dev)
+{
+ struct au1k_private *aup = netdev_priv(dev);
+ char hwname[32];
+ int retval;
+
+ retval = au1k_init(dev);
+ if (retval) {
+ printk(KERN_ERR "%s: error in au1k_init\n", dev->name);
+ return retval;
+ }
+
+ retval = request_irq(aup->irq_tx, &au1k_irda_interrupt, 0,
+ dev->name, dev);
+ if (retval) {
+ printk(KERN_ERR "%s: unable to get IRQ %d\n",
+ dev->name, dev->irq);
+ return retval;
+ }
+ retval = request_irq(aup->irq_rx, &au1k_irda_interrupt, 0,
+ dev->name, dev);
+ if (retval) {
+ free_irq(aup->irq_tx, 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);
+
+ /* int enable */
+ irda_write(aup, IR_CONFIG_2, irda_read(aup, IR_CONFIG_2) | IR_IEN);
+
+ /* power up */
+ au1k_irda_plat_set_phy_mode(aup, AU1000_IRDA_PHY_MODE_SIR);
+
+ 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);
+
+ au1k_irda_plat_set_phy_mode(aup, AU1000_IRDA_PHY_MODE_OFF);
+
+ /* disable interrupts */
+ irda_write(aup, IR_CONFIG_2, irda_read(aup, IR_CONFIG_2) & ~IR_IEN);
+ irda_write(aup, IR_CONFIG_1, 0);
+ irda_write(aup, IR_ENABLE, 0); /* disable clock */
+
+ if (aup->irlap) {
+ irlap_close(aup->irlap);
+ aup->irlap = NULL;
+ }
+
+ netif_stop_queue(dev);
+ del_timer(&aup->timer);
+
+ /* disable the interrupt */
+ free_irq(aup->irq_tx, dev);
+ free_irq(aup->irq_rx, dev);
+
+ clk_disable_unprepare(aup->irda_clk);
+ clk_put(aup->irda_clk);
+
+ return 0;
+}
+
+/*
+ * 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 struct ring_dest *ptxd;
+ struct db_dest *pDB;
+ u32 len, flags;
+
+ 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 NETDEV_TX_OK;
+ }
+
+ 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 (irda_read(aup, IR_RX_BYTE_CNT) != 0) {
+ printk(KERN_DEBUG "tx warning: rx byte cnt %x\n",
+ irda_read(aup, IR_RX_BYTE_CNT));
+ }
+#endif
+
+ if (aup->speed == 4000000) {
+ /* FIR */
+ skb_copy_from_linear_data(skb, (void *)pDB->vaddr, 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;
+ }
+ ptxd->flags |= AU_OWN;
+ wmb();
+
+ irda_write(aup, IR_CONFIG_1,
+ irda_read(aup, IR_CONFIG_1) | IR_TX_ENABLE);
+ irda_write(aup, IR_RING_PROMPT, 0);
+
+ dev_kfree_skb(skb);
+ aup->tx_head = (aup->tx_head + 1) & (NUM_IR_DESC - 1);
+ return NETDEV_TX_OK;
+}
+
+/*
+ * 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);
+}
+
+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 const struct net_device_ops au1k_irda_netdev_ops = {
+ .ndo_open = au1k_irda_start,
+ .ndo_stop = au1k_irda_stop,
+ .ndo_start_xmit = au1k_irda_hard_xmit,
+ .ndo_tx_timeout = au1k_tx_timeout,
+ .ndo_do_ioctl = au1k_irda_ioctl,
+};
+
+static int au1k_irda_net_init(struct net_device *dev)
+{
+ struct au1k_private *aup = netdev_priv(dev);
+ struct db_dest *pDB, *pDBfree;
+ int i, err, retval = 0;
+ dma_addr_t temp;
+
+ err = au1k_irda_init_iobuf(&aup->rx_buff, 14384);
+ if (err)
+ goto out1;
+
+ dev->netdev_ops = &au1k_irda_netdev_ops;
+
+ 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] = (struct ring_dest *)
+ dma_alloc(2 * MAX_NUM_IR_DESC * (sizeof(struct ring_dest)),
+ &temp);
+ if (!aup->rx_ring[0])
+ goto out2;
+
+ /* allocate the data buffers */
+ aup->db[0].vaddr =
+ 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 out3;
+ 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 out3;
+ 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;
+ }
+
+ return 0;
+
+out3:
+ dma_free((void *)aup->rx_ring[0],
+ 2 * MAX_NUM_IR_DESC * (sizeof(struct ring_dest)));
+out2:
+ kfree(aup->rx_buff.head);
+out1:
+ printk(KERN_ERR "au1k_irda_net_init() failed. Returns %d\n", retval);
+ return retval;
+}
+
+static int au1k_irda_probe(struct platform_device *pdev)
+{
+ struct au1k_private *aup;
+ struct net_device *dev;
+ struct resource *r;
+ struct clk *c;
+ int err;
+
+ dev = alloc_irdadev(sizeof(struct au1k_private));
+ if (!dev)
+ return -ENOMEM;
+
+ aup = netdev_priv(dev);
+
+ aup->platdata = pdev->dev.platform_data;
+
+ err = -EINVAL;
+ r = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
+ if (!r)
+ goto out;
+
+ aup->irq_tx = r->start;
+
+ r = platform_get_resource(pdev, IORESOURCE_IRQ, 1);
+ if (!r)
+ goto out;
+
+ aup->irq_rx = r->start;
+
+ r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!r)
+ goto out;
+
+ err = -EBUSY;
+ aup->ioarea = request_mem_region(r->start, resource_size(r),
+ pdev->name);
+ if (!aup->ioarea)
+ goto out;
+
+ /* bail out early if clock doesn't exist */
+ c = clk_get(NULL, "irda_clk");
+ if (IS_ERR(c)) {
+ err = PTR_ERR(c);
+ goto out;
+ }
+ clk_put(c);
+
+ aup->iobase = ioremap_nocache(r->start, resource_size(r));
+ if (!aup->iobase)
+ goto out2;
+
+ dev->irq = aup->irq_rx;
+
+ err = au1k_irda_net_init(dev);
+ if (err)
+ goto out3;
+ err = register_netdev(dev);
+ if (err)
+ goto out4;
+
+ platform_set_drvdata(pdev, dev);
+
+ printk(KERN_INFO "IrDA: Registered device %s\n", dev->name);
+ return 0;
+
+out4:
+ 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(struct ring_dest)));
+ kfree(aup->rx_buff.head);
+out3:
+ iounmap(aup->iobase);
+out2:
+ release_resource(aup->ioarea);
+ kfree(aup->ioarea);
+out:
+ free_netdev(dev);
+ return err;
+}
+
+static int au1k_irda_remove(struct platform_device *pdev)
+{
+ struct net_device *dev = platform_get_drvdata(pdev);
+ 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(struct ring_dest)));
+ kfree(aup->rx_buff.head);
+
+ iounmap(aup->iobase);
+ release_resource(aup->ioarea);
+ kfree(aup->ioarea);
+
+ free_netdev(dev);
+
+ return 0;
+}
+
+static struct platform_driver au1k_irda_driver = {
+ .driver = {
+ .name = "au1000-irda",
+ },
+ .probe = au1k_irda_probe,
+ .remove = au1k_irda_remove,
+};
+
+module_platform_driver(au1k_irda_driver);
+
+MODULE_AUTHOR("Pete Popov <ppopov@mvista.com>");
+MODULE_DESCRIPTION("Au1000 IrDA Device Driver");
Code Review / kvmfornfv.git / blobdiff