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linux-next/drivers/net/irda/au1k_ir.c
Chunyan Zhang 270d73c1c3 irda: Removed all unused timeval variables 
In the file au1k_ir.c & via-ircc.h, there were two unused definitions of the
timeval type members, this commit therefore removes this unneeded code.

In other three files, the same problem is the rx_time member is only ever
written, never read, so removed it entirely.

Signed-off-by: Chunyan Zhang <zhang.chunyan@linaro.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-01-11 21:39:40 -05:00

998 lines
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/*
* 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");
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