leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity
c4028958b6
linux/drivers/net/irda/pxaficp_ir.c
David Howells 7d12e780e0 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers 
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:10:12 +01:00

866 lines
19 KiB
C
Raw Blame History

/*
* linux/drivers/net/irda/pxaficp_ir.c
*
* Based on sa1100_ir.c by Russell King
*
* Changes copyright (C) 2003-2005 MontaVista Software, Inc.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* Infra-red driver (SIR/FIR) for the PXA2xx embedded microprocessor
*
*/
#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/dma-mapping.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <net/irda/irda.h>
#include <net/irda/irmod.h>
#include <net/irda/wrapper.h>
#include <net/irda/irda_device.h>
#include <asm/irq.h>
#include <asm/dma.h>
#include <asm/delay.h>
#include <asm/hardware.h>
#include <asm/arch/irda.h>
#include <asm/arch/pxa-regs.h>
#ifdef CONFIG_MACH_MAINSTONE
#include <asm/arch/mainstone.h>
#endif
#define IrSR_RXPL_NEG_IS_ZERO (1<<4)
#define IrSR_RXPL_POS_IS_ZERO 0x0
#define IrSR_TXPL_NEG_IS_ZERO (1<<3)
#define IrSR_TXPL_POS_IS_ZERO 0x0
#define IrSR_XMODE_PULSE_1_6 (1<<2)
#define IrSR_XMODE_PULSE_3_16 0x0
#define IrSR_RCVEIR_IR_MODE (1<<1)
#define IrSR_RCVEIR_UART_MODE 0x0
#define IrSR_XMITIR_IR_MODE (1<<0)
#define IrSR_XMITIR_UART_MODE 0x0
#define IrSR_IR_RECEIVE_ON (\
IrSR_RXPL_NEG_IS_ZERO | \
IrSR_TXPL_POS_IS_ZERO | \
IrSR_XMODE_PULSE_3_16 | \
IrSR_RCVEIR_IR_MODE | \
IrSR_XMITIR_UART_MODE)
#define IrSR_IR_TRANSMIT_ON (\
IrSR_RXPL_NEG_IS_ZERO | \
IrSR_TXPL_POS_IS_ZERO | \
IrSR_XMODE_PULSE_3_16 | \
IrSR_RCVEIR_UART_MODE | \
IrSR_XMITIR_IR_MODE)
struct pxa_irda {
int speed;
int newspeed;
unsigned long last_oscr;
unsigned char *dma_rx_buff;
unsigned char *dma_tx_buff;
dma_addr_t dma_rx_buff_phy;
dma_addr_t dma_tx_buff_phy;
unsigned int dma_tx_buff_len;
int txdma;
int rxdma;
struct net_device_stats stats;
struct irlap_cb *irlap;
struct qos_info qos;
iobuff_t tx_buff;
iobuff_t rx_buff;
struct device *dev;
struct pxaficp_platform_data *pdata;
};
#define IS_FIR(si) ((si)->speed >= 4000000)
#define IRDA_FRAME_SIZE_LIMIT 2047
inline static void pxa_irda_fir_dma_rx_start(struct pxa_irda *si)
{
DCSR(si->rxdma) = DCSR_NODESC;
DSADR(si->rxdma) = __PREG(ICDR);
DTADR(si->rxdma) = si->dma_rx_buff_phy;
DCMD(si->rxdma) = DCMD_INCTRGADDR | DCMD_FLOWSRC | DCMD_WIDTH1 | DCMD_BURST32 | IRDA_FRAME_SIZE_LIMIT;
DCSR(si->rxdma) |= DCSR_RUN;
}
inline static void pxa_irda_fir_dma_tx_start(struct pxa_irda *si)
{
DCSR(si->txdma) = DCSR_NODESC;
DSADR(si->txdma) = si->dma_tx_buff_phy;
DTADR(si->txdma) = __PREG(ICDR);
DCMD(si->txdma) = DCMD_INCSRCADDR | DCMD_FLOWTRG | DCMD_ENDIRQEN | DCMD_WIDTH1 | DCMD_BURST32 | si->dma_tx_buff_len;
DCSR(si->txdma) |= DCSR_RUN;
}
/*
* Set the IrDA communications speed.
*/
static int pxa_irda_set_speed(struct pxa_irda *si, int speed)
{
unsigned long flags;
unsigned int divisor;
switch (speed) {
case 9600: case 19200: case 38400:
case 57600: case 115200:
/* refer to PXA250/210 Developer's Manual 10-7 */
/* BaudRate = 14.7456 MHz / (16*Divisor) */
divisor = 14745600 / (16 * speed);
local_irq_save(flags);
if (IS_FIR(si)) {
/* stop RX DMA */
DCSR(si->rxdma) &= ~DCSR_RUN;
/* disable FICP */
ICCR0 = 0;
pxa_set_cken(CKEN13_FICP, 0);
/* set board transceiver to SIR mode */
si->pdata->transceiver_mode(si->dev, IR_SIRMODE);
/* configure GPIO46/47 */
pxa_gpio_mode(GPIO46_STRXD_MD);
pxa_gpio_mode(GPIO47_STTXD_MD);
/* enable the STUART clock */
pxa_set_cken(CKEN5_STUART, 1);
}
/* disable STUART first */
STIER = 0;
/* access DLL & DLH */
STLCR |= LCR_DLAB;
STDLL = divisor & 0xff;
STDLH = divisor >> 8;
STLCR &= ~LCR_DLAB;
si->speed = speed;
STISR = IrSR_IR_RECEIVE_ON | IrSR_XMODE_PULSE_1_6;
STIER = IER_UUE | IER_RLSE | IER_RAVIE | IER_RTIOE;
local_irq_restore(flags);
break;
case 4000000:
local_irq_save(flags);
/* disable STUART */
STIER = 0;
STISR = 0;
pxa_set_cken(CKEN5_STUART, 0);
/* disable FICP first */
ICCR0 = 0;
/* set board transceiver to FIR mode */
si->pdata->transceiver_mode(si->dev, IR_FIRMODE);
/* configure GPIO46/47 */
pxa_gpio_mode(GPIO46_ICPRXD_MD);
pxa_gpio_mode(GPIO47_ICPTXD_MD);
/* enable the FICP clock */
pxa_set_cken(CKEN13_FICP, 1);
si->speed = speed;
pxa_irda_fir_dma_rx_start(si);
ICCR0 = ICCR0_ITR | ICCR0_RXE;
local_irq_restore(flags);
break;
default:
return -EINVAL;
}
return 0;
}
/* SIR interrupt service routine. */
static irqreturn_t pxa_irda_sir_irq(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
struct pxa_irda *si = netdev_priv(dev);
int iir, lsr, data;
iir = STIIR;
switch (iir & 0x0F) {
case 0x06: /* Receiver Line Status */
lsr = STLSR;
while (lsr & LSR_FIFOE) {
data = STRBR;
if (lsr & (LSR_OE | LSR_PE | LSR_FE | LSR_BI)) {
printk(KERN_DEBUG "pxa_ir: sir receiving error\n");
si->stats.rx_errors++;
if (lsr & LSR_FE)
si->stats.rx_frame_errors++;
if (lsr & LSR_OE)
si->stats.rx_fifo_errors++;
} else {
si->stats.rx_bytes++;
async_unwrap_char(dev, &si->stats, &si->rx_buff, data);
}
lsr = STLSR;
}
dev->last_rx = jiffies;
si->last_oscr = OSCR;
break;
case 0x04: /* Received Data Available */
/* forth through */
case 0x0C: /* Character Timeout Indication */
do {
si->stats.rx_bytes++;
async_unwrap_char(dev, &si->stats, &si->rx_buff, STRBR);
} while (STLSR & LSR_DR);
dev->last_rx = jiffies;
si->last_oscr = OSCR;
break;
case 0x02: /* Transmit FIFO Data Request */
while ((si->tx_buff.len) && (STLSR & LSR_TDRQ)) {
STTHR = *si->tx_buff.data++;
si->tx_buff.len -= 1;
}
if (si->tx_buff.len == 0) {
si->stats.tx_packets++;
si->stats.tx_bytes += si->tx_buff.data -
si->tx_buff.head;
/* We need to ensure that the transmitter has finished. */
while ((STLSR & LSR_TEMT) == 0)
cpu_relax();
si->last_oscr = OSCR;
/*
* Ok, we've finished transmitting. Now enable
* the receiver. Sometimes we get a receive IRQ
* immediately after a transmit...
*/
if (si->newspeed) {
pxa_irda_set_speed(si, si->newspeed);
si->newspeed = 0;
} else {
/* enable IR Receiver, disable IR Transmitter */
STISR = IrSR_IR_RECEIVE_ON | IrSR_XMODE_PULSE_1_6;
/* enable STUART and receive interrupts */
STIER = IER_UUE | IER_RLSE | IER_RAVIE | IER_RTIOE;
}
/* I'm hungry! */
netif_wake_queue(dev);
}
break;
}
return IRQ_HANDLED;
}
/* FIR Receive DMA interrupt handler */
static void pxa_irda_fir_dma_rx_irq(int channel, void *data)
{
int dcsr = DCSR(channel);
DCSR(channel) = dcsr & ~DCSR_RUN;
printk(KERN_DEBUG "pxa_ir: fir rx dma bus error %#x\n", dcsr);
}
/* FIR Transmit DMA interrupt handler */
static void pxa_irda_fir_dma_tx_irq(int channel, void *data)
{
struct net_device *dev = data;
struct pxa_irda *si = netdev_priv(dev);
int dcsr;
dcsr = DCSR(channel);
DCSR(channel) = dcsr & ~DCSR_RUN;
if (dcsr & DCSR_ENDINTR) {
si->stats.tx_packets++;
si->stats.tx_bytes += si->dma_tx_buff_len;
} else {
si->stats.tx_errors++;
}
while (ICSR1 & ICSR1_TBY)
cpu_relax();
si->last_oscr = OSCR;
/*
* HACK: It looks like the TBY bit is dropped too soon.
* Without this delay things break.
*/
udelay(120);
if (si->newspeed) {
pxa_irda_set_speed(si, si->newspeed);
si->newspeed = 0;
} else {
ICCR0 = 0;
pxa_irda_fir_dma_rx_start(si);
ICCR0 = ICCR0_ITR | ICCR0_RXE;
}
netif_wake_queue(dev);
}
/* EIF(Error in FIFO/End in Frame) handler for FIR */
static void pxa_irda_fir_irq_eif(struct pxa_irda *si, struct net_device *dev)
{
unsigned int len, stat, data;
/* Get the current data position. */
len = DTADR(si->rxdma) - si->dma_rx_buff_phy;
do {
/* Read Status, and then Data. */
stat = ICSR1;
rmb();
data = ICDR;
if (stat & (ICSR1_CRE | ICSR1_ROR)) {
si->stats.rx_errors++;
if (stat & ICSR1_CRE) {
printk(KERN_DEBUG "pxa_ir: fir receive CRC error\n");
si->stats.rx_crc_errors++;
}
if (stat & ICSR1_ROR) {
printk(KERN_DEBUG "pxa_ir: fir receive overrun\n");
si->stats.rx_frame_errors++;
}
} else {
si->dma_rx_buff[len++] = data;
}
/* If we hit the end of frame, there's no point in continuing. */
if (stat & ICSR1_EOF)
break;
} while (ICSR0 & ICSR0_EIF);
if (stat & ICSR1_EOF) {
/* end of frame. */
struct sk_buff *skb = alloc_skb(len+1,GFP_ATOMIC);
if (!skb) {
printk(KERN_ERR "pxa_ir: fir out of memory for receive skb\n");
si->stats.rx_dropped++;
return;
}
/* Align IP header to 20 bytes */
skb_reserve(skb, 1);
memcpy(skb->data, si->dma_rx_buff, len);
skb_put(skb, len);
/* Feed it to IrLAP */
skb->dev = dev;
skb->mac.raw = skb->data;
skb->protocol = htons(ETH_P_IRDA);
netif_rx(skb);
si->stats.rx_packets++;
si->stats.rx_bytes += len;
dev->last_rx = jiffies;
}
}
/* FIR interrupt handler */
static irqreturn_t pxa_irda_fir_irq(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
struct pxa_irda *si = netdev_priv(dev);
int icsr0;
/* stop RX DMA */
DCSR(si->rxdma) &= ~DCSR_RUN;
si->last_oscr = OSCR;
icsr0 = ICSR0;
if (icsr0 & (ICSR0_FRE | ICSR0_RAB)) {
if (icsr0 & ICSR0_FRE) {
printk(KERN_DEBUG "pxa_ir: fir receive frame error\n");
si->stats.rx_frame_errors++;
} else {
printk(KERN_DEBUG "pxa_ir: fir receive abort\n");
si->stats.rx_errors++;
}
ICSR0 = icsr0 & (ICSR0_FRE | ICSR0_RAB);
}
if (icsr0 & ICSR0_EIF) {
/* An error in FIFO occured, or there is a end of frame */
pxa_irda_fir_irq_eif(si, dev);
}
ICCR0 = 0;
pxa_irda_fir_dma_rx_start(si);
ICCR0 = ICCR0_ITR | ICCR0_RXE;
return IRQ_HANDLED;
}
/* hard_xmit interface of irda device */
static int pxa_irda_hard_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct pxa_irda *si = netdev_priv(dev);
int speed = irda_get_next_speed(skb);
/*
* Does this packet contain a request to change the interface
* speed? If so, remember it until we complete the transmission
* of this frame.
*/
if (speed != si->speed && speed != -1)
si->newspeed = speed;
/*
* If this is an empty frame, we can bypass a lot.
*/
if (skb->len == 0) {
if (si->newspeed) {
si->newspeed = 0;
pxa_irda_set_speed(si, speed);
}
dev_kfree_skb(skb);
return 0;
}
netif_stop_queue(dev);
if (!IS_FIR(si)) {
si->tx_buff.data = si->tx_buff.head;
si->tx_buff.len = async_wrap_skb(skb, si->tx_buff.data, si->tx_buff.truesize);
/* Disable STUART interrupts and switch to transmit mode. */
STIER = 0;
STISR = IrSR_IR_TRANSMIT_ON | IrSR_XMODE_PULSE_1_6;
/* enable STUART and transmit interrupts */
STIER = IER_UUE | IER_TIE;
} else {
unsigned long mtt = irda_get_mtt(skb);
si->dma_tx_buff_len = skb->len;
memcpy(si->dma_tx_buff, skb->data, skb->len);
if (mtt)
while ((unsigned)(OSCR - si->last_oscr)/4 < mtt)
cpu_relax();
/* stop RX DMA, disable FICP */
DCSR(si->rxdma) &= ~DCSR_RUN;
ICCR0 = 0;
pxa_irda_fir_dma_tx_start(si);
ICCR0 = ICCR0_ITR | ICCR0_TXE;
}
dev_kfree_skb(skb);
dev->trans_start = jiffies;
return 0;
}
static int pxa_irda_ioctl(struct net_device *dev, struct ifreq *ifreq, int cmd)
{
struct if_irda_req *rq = (struct if_irda_req *)ifreq;
struct pxa_irda *si = netdev_priv(dev);
int ret;
switch (cmd) {
case SIOCSBANDWIDTH:
ret = -EPERM;
if (capable(CAP_NET_ADMIN)) {
/*
* We are unable to set the speed if the
* device is not running.
*/
if (netif_running(dev)) {
ret = pxa_irda_set_speed(si,
rq->ifr_baudrate);
} else {
printk(KERN_INFO "pxa_ir: SIOCSBANDWIDTH: !netif_running\n");
ret = 0;
}
}
break;
case SIOCSMEDIABUSY:
ret = -EPERM;
if (capable(CAP_NET_ADMIN)) {
irda_device_set_media_busy(dev, TRUE);
ret = 0;
}
break;
case SIOCGRECEIVING:
ret = 0;
rq->ifr_receiving = IS_FIR(si) ? 0
: si->rx_buff.state != OUTSIDE_FRAME;
break;
default:
ret = -EOPNOTSUPP;
break;
}
return ret;
}
static struct net_device_stats *pxa_irda_stats(struct net_device *dev)
{
struct pxa_irda *si = netdev_priv(dev);
return &si->stats;
}
static void pxa_irda_startup(struct pxa_irda *si)
{
/* Disable STUART interrupts */
STIER = 0;
/* enable STUART interrupt to the processor */
STMCR = MCR_OUT2;
/* configure SIR frame format: StartBit - Data 7 ... Data 0 - Stop Bit */
STLCR = LCR_WLS0 | LCR_WLS1;
/* enable FIFO, we use FIFO to improve performance */
STFCR = FCR_TRFIFOE | FCR_ITL_32;
/* disable FICP */
ICCR0 = 0;
/* configure FICP ICCR2 */
ICCR2 = ICCR2_TXP | ICCR2_TRIG_32;
/* configure DMAC */
DRCMR17 = si->rxdma | DRCMR_MAPVLD;
DRCMR18 = si->txdma | DRCMR_MAPVLD;
/* force SIR reinitialization */
si->speed = 4000000;
pxa_irda_set_speed(si, 9600);
printk(KERN_DEBUG "pxa_ir: irda startup\n");
}
static void pxa_irda_shutdown(struct pxa_irda *si)
{
unsigned long flags;
local_irq_save(flags);
/* disable STUART and interrupt */
STIER = 0;
/* disable STUART SIR mode */
STISR = 0;
/* disable the STUART clock */
pxa_set_cken(CKEN5_STUART, 0);
/* disable DMA */
DCSR(si->txdma) &= ~DCSR_RUN;
DCSR(si->rxdma) &= ~DCSR_RUN;
/* disable FICP */
ICCR0 = 0;
/* disable the FICP clock */
pxa_set_cken(CKEN13_FICP, 0);
DRCMR17 = 0;
DRCMR18 = 0;
local_irq_restore(flags);
/* power off board transceiver */
si->pdata->transceiver_mode(si->dev, IR_OFF);
printk(KERN_DEBUG "pxa_ir: irda shutdown\n");
}
static int pxa_irda_start(struct net_device *dev)
{
struct pxa_irda *si = netdev_priv(dev);
int err;
si->speed = 9600;
err = request_irq(IRQ_STUART, pxa_irda_sir_irq, 0, dev->name, dev);
if (err)
goto err_irq1;
err = request_irq(IRQ_ICP, pxa_irda_fir_irq, 0, dev->name, dev);
if (err)
goto err_irq2;
/*
* The interrupt must remain disabled for now.
*/
disable_irq(IRQ_STUART);
disable_irq(IRQ_ICP);
err = -EBUSY;
si->rxdma = pxa_request_dma("FICP_RX",DMA_PRIO_LOW, pxa_irda_fir_dma_rx_irq, dev);
if (si->rxdma < 0)
goto err_rx_dma;
si->txdma = pxa_request_dma("FICP_TX",DMA_PRIO_LOW, pxa_irda_fir_dma_tx_irq, dev);
if (si->txdma < 0)
goto err_tx_dma;
err = -ENOMEM;
si->dma_rx_buff = dma_alloc_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT,
&si->dma_rx_buff_phy, GFP_KERNEL );
if (!si->dma_rx_buff)
goto err_dma_rx_buff;
si->dma_tx_buff = dma_alloc_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT,
&si->dma_tx_buff_phy, GFP_KERNEL );
if (!si->dma_tx_buff)
goto err_dma_tx_buff;
/* Setup the serial port for the initial speed. */
pxa_irda_startup(si);
/*
* Open a new IrLAP layer instance.
*/
si->irlap = irlap_open(dev, &si->qos, "pxa");
err = -ENOMEM;
if (!si->irlap)
goto err_irlap;
/*
* Now enable the interrupt and start the queue
*/
enable_irq(IRQ_STUART);
enable_irq(IRQ_ICP);
netif_start_queue(dev);
printk(KERN_DEBUG "pxa_ir: irda driver opened\n");
return 0;
err_irlap:
pxa_irda_shutdown(si);
dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_tx_buff, si->dma_tx_buff_phy);
err_dma_tx_buff:
dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_rx_buff, si->dma_rx_buff_phy);
err_dma_rx_buff:
pxa_free_dma(si->txdma);
err_tx_dma:
pxa_free_dma(si->rxdma);
err_rx_dma:
free_irq(IRQ_ICP, dev);
err_irq2:
free_irq(IRQ_STUART, dev);
err_irq1:
return err;
}
static int pxa_irda_stop(struct net_device *dev)
{
struct pxa_irda *si = netdev_priv(dev);
netif_stop_queue(dev);
pxa_irda_shutdown(si);
/* Stop IrLAP */
if (si->irlap) {
irlap_close(si->irlap);
si->irlap = NULL;
}
free_irq(IRQ_STUART, dev);
free_irq(IRQ_ICP, dev);
pxa_free_dma(si->rxdma);
pxa_free_dma(si->txdma);
if (si->dma_rx_buff)
dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_tx_buff, si->dma_tx_buff_phy);
if (si->dma_tx_buff)
dma_free_coherent(si->dev, IRDA_FRAME_SIZE_LIMIT, si->dma_rx_buff, si->dma_rx_buff_phy);
printk(KERN_DEBUG "pxa_ir: irda driver closed\n");
return 0;
}
static int pxa_irda_suspend(struct device *_dev, pm_message_t state)
{
struct net_device *dev = dev_get_drvdata(_dev);
struct pxa_irda *si;
if (dev && netif_running(dev)) {
si = netdev_priv(dev);
netif_device_detach(dev);
pxa_irda_shutdown(si);
}
return 0;
}
static int pxa_irda_resume(struct device *_dev)
{
struct net_device *dev = dev_get_drvdata(_dev);
struct pxa_irda *si;
if (dev && netif_running(dev)) {
si = netdev_priv(dev);
pxa_irda_startup(si);
netif_device_attach(dev);
netif_wake_queue(dev);
}
return 0;
}
static int pxa_irda_init_iobuf(iobuff_t *io, int size)
{
io->head = kmalloc(size, GFP_KERNEL | GFP_DMA);
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 pxa_irda_probe(struct device *_dev)
{
struct platform_device *pdev = to_platform_device(_dev);
struct net_device *dev;
struct pxa_irda *si;
unsigned int baudrate_mask;
int err;
if (!pdev->dev.platform_data)
return -ENODEV;
err = request_mem_region(__PREG(STUART), 0x24, "IrDA") ? 0 : -EBUSY;
if (err)
goto err_mem_1;
err = request_mem_region(__PREG(FICP), 0x1c, "IrDA") ? 0 : -EBUSY;
if (err)
goto err_mem_2;
dev = alloc_irdadev(sizeof(struct pxa_irda));
if (!dev)
goto err_mem_3;
si = netdev_priv(dev);
si->dev = &pdev->dev;
si->pdata = pdev->dev.platform_data;
/*
* Initialise the SIR buffers
*/
err = pxa_irda_init_iobuf(&si->rx_buff, 14384);
if (err)
goto err_mem_4;
err = pxa_irda_init_iobuf(&si->tx_buff, 4000);
if (err)
goto err_mem_5;
dev->hard_start_xmit = pxa_irda_hard_xmit;
dev->open = pxa_irda_start;
dev->stop = pxa_irda_stop;
dev->do_ioctl = pxa_irda_ioctl;
dev->get_stats = pxa_irda_stats;
irda_init_max_qos_capabilies(&si->qos);
baudrate_mask = 0;
if (si->pdata->transceiver_cap & IR_SIRMODE)
baudrate_mask |= IR_9600|IR_19200|IR_38400|IR_57600|IR_115200;
if (si->pdata->transceiver_cap & IR_FIRMODE)
baudrate_mask |= IR_4000000 << 8;
si->qos.baud_rate.bits &= baudrate_mask;
si->qos.min_turn_time.bits = 7; /* 1ms or more */
irda_qos_bits_to_value(&si->qos);
err = register_netdev(dev);
if (err == 0)
dev_set_drvdata(&pdev->dev, dev);
if (err) {
kfree(si->tx_buff.head);
err_mem_5:
kfree(si->rx_buff.head);
err_mem_4:
free_netdev(dev);
err_mem_3:
release_mem_region(__PREG(FICP), 0x1c);
err_mem_2:
release_mem_region(__PREG(STUART), 0x24);
}
err_mem_1:
return err;
}
static int pxa_irda_remove(struct device *_dev)
{
struct net_device *dev = dev_get_drvdata(_dev);
if (dev) {
struct pxa_irda *si = netdev_priv(dev);
unregister_netdev(dev);
kfree(si->tx_buff.head);
kfree(si->rx_buff.head);
free_netdev(dev);
}
release_mem_region(__PREG(STUART), 0x24);
release_mem_region(__PREG(FICP), 0x1c);
return 0;
}
static struct device_driver pxa_ir_driver = {
.name = "pxa2xx-ir",
.bus = &platform_bus_type,
.probe = pxa_irda_probe,
.remove = pxa_irda_remove,
.suspend = pxa_irda_suspend,
.resume = pxa_irda_resume,
};
static int __init pxa_irda_init(void)
{
return driver_register(&pxa_ir_driver);
}
static void __exit pxa_irda_exit(void)
{
driver_unregister(&pxa_ir_driver);
}
module_init(pxa_irda_init);
module_exit(pxa_irda_exit);
MODULE_LICENSE("GPL");
Reference in New Issue View Git Blame Copy Permalink