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android_kernel_xiaomi_sm8350/drivers/net/irda/w83977af_ir.c
Jeff Garzik c31f28e778 drivers/net: eliminate irq handler impossible checks, needless casts 
- Eliminate check for irq handler 'dev_id==NULL' where the
  condition never occurs.

- Eliminate needless casts to/from void*

Signed-off-by: Jeff Garzik <jeff@garzik.org>
2006-10-06 14:56:04 -04:00

1373 lines
32 KiB
C
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/*********************************************************************
*
* Filename: w83977af_ir.c
* Version: 1.0
* Description: FIR driver for the Winbond W83977AF Super I/O chip
* Status: Experimental.
* Author: Paul VanderSpek
* Created at: Wed Nov 4 11:46:16 1998
* Modified at: Fri Jan 28 12:10:59 2000
* Modified by: Dag Brattli <dagb@cs.uit.no>
*
* Copyright (c) 1998-2000 Dag Brattli <dagb@cs.uit.no>
* Copyright (c) 1998-1999 Rebel.com
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* Neither Paul VanderSpek nor Rebel.com admit liability nor provide
* warranty for any of this software. This material is provided "AS-IS"
* and at no charge.
*
* If you find bugs in this file, its very likely that the same bug
* will also be in pc87108.c since the implementations are quite
* similar.
*
* Notice that all functions that needs to access the chip in _any_
* way, must save BSR register on entry, and restore it on exit.
* It is _very_ important to follow this policy!
*
* __u8 bank;
*
* bank = inb( iobase+BSR);
*
* do_your_stuff_here();
*
* outb( bank, iobase+BSR);
*
********************************************************************/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/skbuff.h>
#include <linux/netdevice.h>
#include <linux/ioport.h>
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/rtnetlink.h>
#include <linux/dma-mapping.h>
#include <asm/io.h>
#include <asm/dma.h>
#include <asm/byteorder.h>
#include <net/irda/irda.h>
#include <net/irda/wrapper.h>
#include <net/irda/irda_device.h>
#include "w83977af.h"
#include "w83977af_ir.h"
#ifdef CONFIG_ARCH_NETWINDER /* Adjust to NetWinder differences */
#undef CONFIG_NETWINDER_TX_DMA_PROBLEMS /* Not needed */
#define CONFIG_NETWINDER_RX_DMA_PROBLEMS /* Must have this one! */
#endif
#undef CONFIG_USE_INTERNAL_TIMER /* Just cannot make that timer work */
#define CONFIG_USE_W977_PNP /* Currently needed */
#define PIO_MAX_SPEED 115200
static char *driver_name = "w83977af_ir";
static int qos_mtt_bits = 0x07; /* 1 ms or more */
#define CHIP_IO_EXTENT 8
static unsigned int io[] = { 0x180, ~0, ~0, ~0 };
#ifdef CONFIG_ARCH_NETWINDER /* Adjust to NetWinder differences */
static unsigned int irq[] = { 6, 0, 0, 0 };
#else
static unsigned int irq[] = { 11, 0, 0, 0 };
#endif
static unsigned int dma[] = { 1, 0, 0, 0 };
static unsigned int efbase[] = { W977_EFIO_BASE, W977_EFIO2_BASE };
static unsigned int efio = W977_EFIO_BASE;
static struct w83977af_ir *dev_self[] = { NULL, NULL, NULL, NULL};
/* Some prototypes */
static int w83977af_open(int i, unsigned int iobase, unsigned int irq,
unsigned int dma);
static int w83977af_close(struct w83977af_ir *self);
static int w83977af_probe(int iobase, int irq, int dma);
static int w83977af_dma_receive(struct w83977af_ir *self);
static int w83977af_dma_receive_complete(struct w83977af_ir *self);
static int w83977af_hard_xmit(struct sk_buff *skb, struct net_device *dev);
static int w83977af_pio_write(int iobase, __u8 *buf, int len, int fifo_size);
static void w83977af_dma_write(struct w83977af_ir *self, int iobase);
static void w83977af_change_speed(struct w83977af_ir *self, __u32 speed);
static int w83977af_is_receiving(struct w83977af_ir *self);
static int w83977af_net_open(struct net_device *dev);
static int w83977af_net_close(struct net_device *dev);
static int w83977af_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd);
static struct net_device_stats *w83977af_net_get_stats(struct net_device *dev);
/*
* Function w83977af_init ()
*
* Initialize chip. Just try to find out how many chips we are dealing with
* and where they are
*/
static int __init w83977af_init(void)
{
int i;
IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
for (i=0; (io[i] < 2000) && (i < ARRAY_SIZE(dev_self)); i++) {
if (w83977af_open(i, io[i], irq[i], dma[i]) == 0)
return 0;
}
return -ENODEV;
}
/*
* Function w83977af_cleanup ()
*
* Close all configured chips
*
*/
static void __exit w83977af_cleanup(void)
{
int i;
IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
for (i=0; i < ARRAY_SIZE(dev_self); i++) {
if (dev_self[i])
w83977af_close(dev_self[i]);
}
}
/*
* Function w83977af_open (iobase, irq)
*
* Open driver instance
*
*/
int w83977af_open(int i, unsigned int iobase, unsigned int irq,
unsigned int dma)
{
struct net_device *dev;
struct w83977af_ir *self;
int err;
IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
/* Lock the port that we need */
if (!request_region(iobase, CHIP_IO_EXTENT, driver_name)) {
IRDA_DEBUG(0, "%s(), can't get iobase of 0x%03x\n",
__FUNCTION__ , iobase);
return -ENODEV;
}
if (w83977af_probe(iobase, irq, dma) == -1) {
err = -1;
goto err_out;
}
/*
* Allocate new instance of the driver
*/
dev = alloc_irdadev(sizeof(struct w83977af_ir));
if (dev == NULL) {
printk( KERN_ERR "IrDA: Can't allocate memory for "
"IrDA control block!\n");
err = -ENOMEM;
goto err_out;
}
self = dev->priv;
spin_lock_init(&self->lock);
/* Initialize IO */
self->io.fir_base = iobase;
self->io.irq = irq;
self->io.fir_ext = CHIP_IO_EXTENT;
self->io.dma = dma;
self->io.fifo_size = 32;
/* Initialize QoS for this device */
irda_init_max_qos_capabilies(&self->qos);
/* The only value we must override it the baudrate */
/* FIXME: The HP HDLS-1100 does not support 1152000! */
self->qos.baud_rate.bits = IR_9600|IR_19200|IR_38400|IR_57600|
IR_115200|IR_576000|IR_1152000|(IR_4000000 << 8);
/* The HP HDLS-1100 needs 1 ms according to the specs */
self->qos.min_turn_time.bits = qos_mtt_bits;
irda_qos_bits_to_value(&self->qos);
/* Max DMA buffer size needed = (data_size + 6) * (window_size) + 6; */
self->rx_buff.truesize = 14384;
self->tx_buff.truesize = 4000;
/* Allocate memory if needed */
self->rx_buff.head =
dma_alloc_coherent(NULL, self->rx_buff.truesize,
&self->rx_buff_dma, GFP_KERNEL);
if (self->rx_buff.head == NULL) {
err = -ENOMEM;
goto err_out1;
}
memset(self->rx_buff.head, 0, self->rx_buff.truesize);
self->tx_buff.head =
dma_alloc_coherent(NULL, self->tx_buff.truesize,
&self->tx_buff_dma, GFP_KERNEL);
if (self->tx_buff.head == NULL) {
err = -ENOMEM;
goto err_out2;
}
memset(self->tx_buff.head, 0, self->tx_buff.truesize);
self->rx_buff.in_frame = FALSE;
self->rx_buff.state = OUTSIDE_FRAME;
self->tx_buff.data = self->tx_buff.head;
self->rx_buff.data = self->rx_buff.head;
self->netdev = dev;
/* Keep track of module usage */
SET_MODULE_OWNER(dev);
/* Override the network functions we need to use */
dev->hard_start_xmit = w83977af_hard_xmit;
dev->open = w83977af_net_open;
dev->stop = w83977af_net_close;
dev->do_ioctl = w83977af_net_ioctl;
dev->get_stats = w83977af_net_get_stats;
err = register_netdev(dev);
if (err) {
IRDA_ERROR("%s(), register_netdevice() failed!\n", __FUNCTION__);
goto err_out3;
}
IRDA_MESSAGE("IrDA: Registered device %s\n", dev->name);
/* Need to store self somewhere */
dev_self[i] = self;
return 0;
err_out3:
dma_free_coherent(NULL, self->tx_buff.truesize,
self->tx_buff.head, self->tx_buff_dma);
err_out2:
dma_free_coherent(NULL, self->rx_buff.truesize,
self->rx_buff.head, self->rx_buff_dma);
err_out1:
free_netdev(dev);
err_out:
release_region(iobase, CHIP_IO_EXTENT);
return err;
}
/*
* Function w83977af_close (self)
*
* Close driver instance
*
*/
static int w83977af_close(struct w83977af_ir *self)
{
int iobase;
IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
iobase = self->io.fir_base;
#ifdef CONFIG_USE_W977_PNP
/* enter PnP configuration mode */
w977_efm_enter(efio);
w977_select_device(W977_DEVICE_IR, efio);
/* Deactivate device */
w977_write_reg(0x30, 0x00, efio);
w977_efm_exit(efio);
#endif /* CONFIG_USE_W977_PNP */
/* Remove netdevice */
unregister_netdev(self->netdev);
/* Release the PORT that this driver is using */
IRDA_DEBUG(0 , "%s(), Releasing Region %03x\n",
__FUNCTION__ , self->io.fir_base);
release_region(self->io.fir_base, self->io.fir_ext);
if (self->tx_buff.head)
dma_free_coherent(NULL, self->tx_buff.truesize,
self->tx_buff.head, self->tx_buff_dma);
if (self->rx_buff.head)
dma_free_coherent(NULL, self->rx_buff.truesize,
self->rx_buff.head, self->rx_buff_dma);
free_netdev(self->netdev);
return 0;
}
int w83977af_probe( int iobase, int irq, int dma)
{
int version;
int i;
for (i=0; i < 2; i++) {
IRDA_DEBUG( 0, "%s()\n", __FUNCTION__ );
#ifdef CONFIG_USE_W977_PNP
/* Enter PnP configuration mode */
w977_efm_enter(efbase[i]);
w977_select_device(W977_DEVICE_IR, efbase[i]);
/* Configure PnP port, IRQ, and DMA channel */
w977_write_reg(0x60, (iobase >> 8) & 0xff, efbase[i]);
w977_write_reg(0x61, (iobase) & 0xff, efbase[i]);
w977_write_reg(0x70, irq, efbase[i]);
#ifdef CONFIG_ARCH_NETWINDER
/* Netwinder uses 1 higher than Linux */
w977_write_reg(0x74, dma+1, efbase[i]);
#else
w977_write_reg(0x74, dma, efbase[i]);
#endif /*CONFIG_ARCH_NETWINDER */
w977_write_reg(0x75, 0x04, efbase[i]); /* Disable Tx DMA */
/* Set append hardware CRC, enable IR bank selection */
w977_write_reg(0xf0, APEDCRC|ENBNKSEL, efbase[i]);
/* Activate device */
w977_write_reg(0x30, 0x01, efbase[i]);
w977_efm_exit(efbase[i]);
#endif /* CONFIG_USE_W977_PNP */
/* Disable Advanced mode */
switch_bank(iobase, SET2);
outb(iobase+2, 0x00);
/* Turn on UART (global) interrupts */
switch_bank(iobase, SET0);
outb(HCR_EN_IRQ, iobase+HCR);
/* Switch to advanced mode */
switch_bank(iobase, SET2);
outb(inb(iobase+ADCR1) | ADCR1_ADV_SL, iobase+ADCR1);
/* Set default IR-mode */
switch_bank(iobase, SET0);
outb(HCR_SIR, iobase+HCR);
/* Read the Advanced IR ID */
switch_bank(iobase, SET3);
version = inb(iobase+AUID);
/* Should be 0x1? */
if (0x10 == (version & 0xf0)) {
efio = efbase[i];
/* Set FIFO size to 32 */
switch_bank(iobase, SET2);
outb(ADCR2_RXFS32|ADCR2_TXFS32, iobase+ADCR2);
/* Set FIFO threshold to TX17, RX16 */
switch_bank(iobase, SET0);
outb(UFR_RXTL|UFR_TXTL|UFR_TXF_RST|UFR_RXF_RST|
UFR_EN_FIFO,iobase+UFR);
/* Receiver frame length */
switch_bank(iobase, SET4);
outb(2048 & 0xff, iobase+6);
outb((2048 >> 8) & 0x1f, iobase+7);
/*
* Init HP HSDL-1100 transceiver.
*
* Set IRX_MSL since we have 2 * receive paths IRRX,
* and IRRXH. Clear IRSL0D since we want IRSL0 * to
* be a input pin used for IRRXH
*
* IRRX pin 37 connected to receiver
* IRTX pin 38 connected to transmitter
* FIRRX pin 39 connected to receiver (IRSL0)
* CIRRX pin 40 connected to pin 37
*/
switch_bank(iobase, SET7);
outb(0x40, iobase+7);
IRDA_MESSAGE("W83977AF (IR) driver loaded. "
"Version: 0x%02x\n", version);
return 0;
} else {
/* Try next extented function register address */
IRDA_DEBUG( 0, "%s(), Wrong chip version", __FUNCTION__ );
}
}
return -1;
}
void w83977af_change_speed(struct w83977af_ir *self, __u32 speed)
{
int ir_mode = HCR_SIR;
int iobase;
__u8 set;
iobase = self->io.fir_base;
/* Update accounting for new speed */
self->io.speed = speed;
/* Save current bank */
set = inb(iobase+SSR);
/* Disable interrupts */
switch_bank(iobase, SET0);
outb(0, iobase+ICR);
/* Select Set 2 */
switch_bank(iobase, SET2);
outb(0x00, iobase+ABHL);
switch (speed) {
case 9600: outb(0x0c, iobase+ABLL); break;
case 19200: outb(0x06, iobase+ABLL); break;
case 38400: outb(0x03, iobase+ABLL); break;
case 57600: outb(0x02, iobase+ABLL); break;
case 115200: outb(0x01, iobase+ABLL); break;
case 576000:
ir_mode = HCR_MIR_576;
IRDA_DEBUG(0, "%s(), handling baud of 576000\n", __FUNCTION__ );
break;
case 1152000:
ir_mode = HCR_MIR_1152;
IRDA_DEBUG(0, "%s(), handling baud of 1152000\n", __FUNCTION__ );
break;
case 4000000:
ir_mode = HCR_FIR;
IRDA_DEBUG(0, "%s(), handling baud of 4000000\n", __FUNCTION__ );
break;
default:
ir_mode = HCR_FIR;
IRDA_DEBUG(0, "%s(), unknown baud rate of %d\n", __FUNCTION__ , speed);
break;
}
/* Set speed mode */
switch_bank(iobase, SET0);
outb(ir_mode, iobase+HCR);
/* set FIFO size to 32 */
switch_bank(iobase, SET2);
outb(ADCR2_RXFS32|ADCR2_TXFS32, iobase+ADCR2);
/* set FIFO threshold to TX17, RX16 */
switch_bank(iobase, SET0);
outb(0x00, iobase+UFR); /* Reset */
outb(UFR_EN_FIFO, iobase+UFR); /* First we must enable FIFO */
outb(0xa7, iobase+UFR);
netif_wake_queue(self->netdev);
/* Enable some interrupts so we can receive frames */
switch_bank(iobase, SET0);
if (speed > PIO_MAX_SPEED) {
outb(ICR_EFSFI, iobase+ICR);
w83977af_dma_receive(self);
} else
outb(ICR_ERBRI, iobase+ICR);
/* Restore SSR */
outb(set, iobase+SSR);
}
/*
* Function w83977af_hard_xmit (skb, dev)
*
* Sets up a DMA transfer to send the current frame.
*
*/
int w83977af_hard_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct w83977af_ir *self;
__s32 speed;
int iobase;
__u8 set;
int mtt;
self = (struct w83977af_ir *) dev->priv;
iobase = self->io.fir_base;
IRDA_DEBUG(4, "%s(%ld), skb->len=%d\n", __FUNCTION__ , jiffies,
(int) skb->len);
/* Lock transmit buffer */
netif_stop_queue(dev);
/* Check if we need to change the speed */
speed = irda_get_next_speed(skb);
if ((speed != self->io.speed) && (speed != -1)) {
/* Check for empty frame */
if (!skb->len) {
w83977af_change_speed(self, speed);
dev->trans_start = jiffies;
dev_kfree_skb(skb);
return 0;
} else
self->new_speed = speed;
}
/* Save current set */
set = inb(iobase+SSR);
/* Decide if we should use PIO or DMA transfer */
if (self->io.speed > PIO_MAX_SPEED) {
self->tx_buff.data = self->tx_buff.head;
memcpy(self->tx_buff.data, skb->data, skb->len);
self->tx_buff.len = skb->len;
mtt = irda_get_mtt(skb);
#ifdef CONFIG_USE_INTERNAL_TIMER
if (mtt > 50) {
/* Adjust for timer resolution */
mtt /= 1000+1;
/* Setup timer */
switch_bank(iobase, SET4);
outb(mtt & 0xff, iobase+TMRL);
outb((mtt >> 8) & 0x0f, iobase+TMRH);
/* Start timer */
outb(IR_MSL_EN_TMR, iobase+IR_MSL);
self->io.direction = IO_XMIT;
/* Enable timer interrupt */
switch_bank(iobase, SET0);
outb(ICR_ETMRI, iobase+ICR);
} else {
#endif
IRDA_DEBUG(4, "%s(%ld), mtt=%d\n", __FUNCTION__ , jiffies, mtt);
if (mtt)
udelay(mtt);
/* Enable DMA interrupt */
switch_bank(iobase, SET0);
outb(ICR_EDMAI, iobase+ICR);
w83977af_dma_write(self, iobase);
#ifdef CONFIG_USE_INTERNAL_TIMER
}
#endif
} else {
self->tx_buff.data = self->tx_buff.head;
self->tx_buff.len = async_wrap_skb(skb, self->tx_buff.data,
self->tx_buff.truesize);
/* Add interrupt on tx low level (will fire immediately) */
switch_bank(iobase, SET0);
outb(ICR_ETXTHI, iobase+ICR);
}
dev->trans_start = jiffies;
dev_kfree_skb(skb);
/* Restore set register */
outb(set, iobase+SSR);
return 0;
}
/*
* Function w83977af_dma_write (self, iobase)
*
* Send frame using DMA
*
*/
static void w83977af_dma_write(struct w83977af_ir *self, int iobase)
{
__u8 set;
#ifdef CONFIG_NETWINDER_TX_DMA_PROBLEMS
unsigned long flags;
__u8 hcr;
#endif
IRDA_DEBUG(4, "%s(), len=%d\n", __FUNCTION__ , self->tx_buff.len);
/* Save current set */
set = inb(iobase+SSR);
/* Disable DMA */
switch_bank(iobase, SET0);
outb(inb(iobase+HCR) & ~HCR_EN_DMA, iobase+HCR);
/* Choose transmit DMA channel */
switch_bank(iobase, SET2);
outb(ADCR1_D_CHSW|/*ADCR1_DMA_F|*/ADCR1_ADV_SL, iobase+ADCR1);
#ifdef CONFIG_NETWINDER_TX_DMA_PROBLEMS
spin_lock_irqsave(&self->lock, flags);
disable_dma(self->io.dma);
clear_dma_ff(self->io.dma);
set_dma_mode(self->io.dma, DMA_MODE_READ);
set_dma_addr(self->io.dma, self->tx_buff_dma);
set_dma_count(self->io.dma, self->tx_buff.len);
#else
irda_setup_dma(self->io.dma, self->tx_buff_dma, self->tx_buff.len,
DMA_MODE_WRITE);
#endif
self->io.direction = IO_XMIT;
/* Enable DMA */
switch_bank(iobase, SET0);
#ifdef CONFIG_NETWINDER_TX_DMA_PROBLEMS
hcr = inb(iobase+HCR);
outb(hcr | HCR_EN_DMA, iobase+HCR);
enable_dma(self->io.dma);
spin_unlock_irqrestore(&self->lock, flags);
#else
outb(inb(iobase+HCR) | HCR_EN_DMA | HCR_TX_WT, iobase+HCR);
#endif
/* Restore set register */
outb(set, iobase+SSR);
}
/*
* Function w83977af_pio_write (iobase, buf, len, fifo_size)
*
*
*
*/
static int w83977af_pio_write(int iobase, __u8 *buf, int len, int fifo_size)
{
int actual = 0;
__u8 set;
IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
/* Save current bank */
set = inb(iobase+SSR);
switch_bank(iobase, SET0);
if (!(inb_p(iobase+USR) & USR_TSRE)) {
IRDA_DEBUG(4,
"%s(), warning, FIFO not empty yet!\n", __FUNCTION__ );
fifo_size -= 17;
IRDA_DEBUG(4, "%s(), %d bytes left in tx fifo\n",
__FUNCTION__ , fifo_size);
}
/* Fill FIFO with current frame */
while ((fifo_size-- > 0) && (actual < len)) {
/* Transmit next byte */
outb(buf[actual++], iobase+TBR);
}
IRDA_DEBUG(4, "%s(), fifo_size %d ; %d sent of %d\n",
__FUNCTION__ , fifo_size, actual, len);
/* Restore bank */
outb(set, iobase+SSR);
return actual;
}
/*
* Function w83977af_dma_xmit_complete (self)
*
* The transfer of a frame in finished. So do the necessary things
*
*
*/
static void w83977af_dma_xmit_complete(struct w83977af_ir *self)
{
int iobase;
__u8 set;
IRDA_DEBUG(4, "%s(%ld)\n", __FUNCTION__ , jiffies);
IRDA_ASSERT(self != NULL, return;);
iobase = self->io.fir_base;
/* Save current set */
set = inb(iobase+SSR);
/* Disable DMA */
switch_bank(iobase, SET0);
outb(inb(iobase+HCR) & ~HCR_EN_DMA, iobase+HCR);
/* Check for underrrun! */
if (inb(iobase+AUDR) & AUDR_UNDR) {
IRDA_DEBUG(0, "%s(), Transmit underrun!\n", __FUNCTION__ );
self->stats.tx_errors++;
self->stats.tx_fifo_errors++;
/* Clear bit, by writing 1 to it */
outb(AUDR_UNDR, iobase+AUDR);
} else
self->stats.tx_packets++;
if (self->new_speed) {
w83977af_change_speed(self, self->new_speed);
self->new_speed = 0;
}
/* Unlock tx_buff and request another frame */
/* Tell the network layer, that we want more frames */
netif_wake_queue(self->netdev);
/* Restore set */
outb(set, iobase+SSR);
}
/*
* Function w83977af_dma_receive (self)
*
* Get ready for receiving a frame. The device will initiate a DMA
* if it starts to receive a frame.
*
*/
int w83977af_dma_receive(struct w83977af_ir *self)
{
int iobase;
__u8 set;
#ifdef CONFIG_NETWINDER_RX_DMA_PROBLEMS
unsigned long flags;
__u8 hcr;
#endif
IRDA_ASSERT(self != NULL, return -1;);
IRDA_DEBUG(4, "%s\n", __FUNCTION__ );
iobase= self->io.fir_base;
/* Save current set */
set = inb(iobase+SSR);
/* Disable DMA */
switch_bank(iobase, SET0);
outb(inb(iobase+HCR) & ~HCR_EN_DMA, iobase+HCR);
/* Choose DMA Rx, DMA Fairness, and Advanced mode */
switch_bank(iobase, SET2);
outb((inb(iobase+ADCR1) & ~ADCR1_D_CHSW)/*|ADCR1_DMA_F*/|ADCR1_ADV_SL,
iobase+ADCR1);
self->io.direction = IO_RECV;
self->rx_buff.data = self->rx_buff.head;
#ifdef CONFIG_NETWINDER_RX_DMA_PROBLEMS
spin_lock_irqsave(&self->lock, flags);
disable_dma(self->io.dma);
clear_dma_ff(self->io.dma);
set_dma_mode(self->io.dma, DMA_MODE_READ);
set_dma_addr(self->io.dma, self->rx_buff_dma);
set_dma_count(self->io.dma, self->rx_buff.truesize);
#else
irda_setup_dma(self->io.dma, self->rx_buff_dma, self->rx_buff.truesize,
DMA_MODE_READ);
#endif
/*
* Reset Rx FIFO. This will also flush the ST_FIFO, it's very
* important that we don't reset the Tx FIFO since it might not
* be finished transmitting yet
*/
switch_bank(iobase, SET0);
outb(UFR_RXTL|UFR_TXTL|UFR_RXF_RST|UFR_EN_FIFO, iobase+UFR);
self->st_fifo.len = self->st_fifo.tail = self->st_fifo.head = 0;
/* Enable DMA */
switch_bank(iobase, SET0);
#ifdef CONFIG_NETWINDER_RX_DMA_PROBLEMS
hcr = inb(iobase+HCR);
outb(hcr | HCR_EN_DMA, iobase+HCR);
enable_dma(self->io.dma);
spin_unlock_irqrestore(&self->lock, flags);
#else
outb(inb(iobase+HCR) | HCR_EN_DMA, iobase+HCR);
#endif
/* Restore set */
outb(set, iobase+SSR);
return 0;
}
/*
* Function w83977af_receive_complete (self)
*
* Finished with receiving a frame
*
*/
int w83977af_dma_receive_complete(struct w83977af_ir *self)
{
struct sk_buff *skb;
struct st_fifo *st_fifo;
int len;
int iobase;
__u8 set;
__u8 status;
IRDA_DEBUG(4, "%s\n", __FUNCTION__ );
st_fifo = &self->st_fifo;
iobase = self->io.fir_base;
/* Save current set */
set = inb(iobase+SSR);
iobase = self->io.fir_base;
/* Read status FIFO */
switch_bank(iobase, SET5);
while ((status = inb(iobase+FS_FO)) & FS_FO_FSFDR) {
st_fifo->entries[st_fifo->tail].status = status;
st_fifo->entries[st_fifo->tail].len = inb(iobase+RFLFL);
st_fifo->entries[st_fifo->tail].len |= inb(iobase+RFLFH) << 8;
st_fifo->tail++;
st_fifo->len++;
}
while (st_fifo->len) {
/* Get first entry */
status = st_fifo->entries[st_fifo->head].status;
len = st_fifo->entries[st_fifo->head].len;
st_fifo->head++;
st_fifo->len--;
/* Check for errors */
if (status & FS_FO_ERR_MSK) {
if (status & FS_FO_LST_FR) {
/* Add number of lost frames to stats */
self->stats.rx_errors += len;
} else {
/* Skip frame */
self->stats.rx_errors++;
self->rx_buff.data += len;
if (status & FS_FO_MX_LEX)
self->stats.rx_length_errors++;
if (status & FS_FO_PHY_ERR)
self->stats.rx_frame_errors++;
if (status & FS_FO_CRC_ERR)
self->stats.rx_crc_errors++;
}
/* The errors below can be reported in both cases */
if (status & FS_FO_RX_OV)
self->stats.rx_fifo_errors++;
if (status & FS_FO_FSF_OV)
self->stats.rx_fifo_errors++;
} else {
/* Check if we have transferred all data to memory */
switch_bank(iobase, SET0);
if (inb(iobase+USR) & USR_RDR) {
#ifdef CONFIG_USE_INTERNAL_TIMER
/* Put this entry back in fifo */
st_fifo->head--;
st_fifo->len++;
st_fifo->entries[st_fifo->head].status = status;
st_fifo->entries[st_fifo->head].len = len;
/* Restore set register */
outb(set, iobase+SSR);
return FALSE; /* I'll be back! */
#else
udelay(80); /* Should be enough!? */
#endif
}
skb = dev_alloc_skb(len+1);
if (skb == NULL) {
printk(KERN_INFO
"%s(), memory squeeze, dropping frame.\n", __FUNCTION__);
/* Restore set register */
outb(set, iobase+SSR);
return FALSE;
}
/* Align to 20 bytes */
skb_reserve(skb, 1);
/* Copy frame without CRC */
if (self->io.speed < 4000000) {
skb_put(skb, len-2);
memcpy(skb->data, self->rx_buff.data, len-2);
} else {
skb_put(skb, len-4);
memcpy(skb->data, self->rx_buff.data, len-4);
}
/* Move to next frame */
self->rx_buff.data += len;
self->stats.rx_packets++;
skb->dev = self->netdev;
skb->mac.raw = skb->data;
skb->protocol = htons(ETH_P_IRDA);
netif_rx(skb);
self->netdev->last_rx = jiffies;
}
}
/* Restore set register */
outb(set, iobase+SSR);
return TRUE;
}
/*
* Function pc87108_pio_receive (self)
*
* Receive all data in receiver FIFO
*
*/
static void w83977af_pio_receive(struct w83977af_ir *self)
{
__u8 byte = 0x00;
int iobase;
IRDA_DEBUG(4, "%s()\n", __FUNCTION__ );
IRDA_ASSERT(self != NULL, return;);
iobase = self->io.fir_base;
/* Receive all characters in Rx FIFO */
do {
byte = inb(iobase+RBR);
async_unwrap_char(self->netdev, &self->stats, &self->rx_buff,
byte);
} while (inb(iobase+USR) & USR_RDR); /* Data available */
}
/*
* Function w83977af_sir_interrupt (self, eir)
*
* Handle SIR interrupt
*
*/
static __u8 w83977af_sir_interrupt(struct w83977af_ir *self, int isr)
{
int actual;
__u8 new_icr = 0;
__u8 set;
int iobase;
IRDA_DEBUG(4, "%s(), isr=%#x\n", __FUNCTION__ , isr);
iobase = self->io.fir_base;
/* Transmit FIFO low on data */
if (isr & ISR_TXTH_I) {
/* Write data left in transmit buffer */
actual = w83977af_pio_write(self->io.fir_base,
self->tx_buff.data,
self->tx_buff.len,
self->io.fifo_size);
self->tx_buff.data += actual;
self->tx_buff.len -= actual;
self->io.direction = IO_XMIT;
/* Check if finished */
if (self->tx_buff.len > 0) {
new_icr |= ICR_ETXTHI;
} else {
set = inb(iobase+SSR);
switch_bank(iobase, SET0);
outb(AUDR_SFEND, iobase+AUDR);
outb(set, iobase+SSR);
self->stats.tx_packets++;
/* Feed me more packets */
netif_wake_queue(self->netdev);
new_icr |= ICR_ETBREI;
}
}
/* Check if transmission has completed */
if (isr & ISR_TXEMP_I) {
/* Check if we need to change the speed? */
if (self->new_speed) {
IRDA_DEBUG(2,
"%s(), Changing speed!\n", __FUNCTION__ );
w83977af_change_speed(self, self->new_speed);
self->new_speed = 0;
}
/* Turn around and get ready to receive some data */
self->io.direction = IO_RECV;
new_icr |= ICR_ERBRI;
}
/* Rx FIFO threshold or timeout */
if (isr & ISR_RXTH_I) {
w83977af_pio_receive(self);
/* Keep receiving */
new_icr |= ICR_ERBRI;
}
return new_icr;
}
/*
* Function pc87108_fir_interrupt (self, eir)
*
* Handle MIR/FIR interrupt
*
*/
static __u8 w83977af_fir_interrupt(struct w83977af_ir *self, int isr)
{
__u8 new_icr = 0;
__u8 set;
int iobase;
iobase = self->io.fir_base;
set = inb(iobase+SSR);
/* End of frame detected in FIFO */
if (isr & (ISR_FEND_I|ISR_FSF_I)) {
if (w83977af_dma_receive_complete(self)) {
/* Wait for next status FIFO interrupt */
new_icr |= ICR_EFSFI;
} else {
/* DMA not finished yet */
/* Set timer value, resolution 1 ms */
switch_bank(iobase, SET4);
outb(0x01, iobase+TMRL); /* 1 ms */
outb(0x00, iobase+TMRH);
/* Start timer */
outb(IR_MSL_EN_TMR, iobase+IR_MSL);
new_icr |= ICR_ETMRI;
}
}
/* Timer finished */
if (isr & ISR_TMR_I) {
/* Disable timer */
switch_bank(iobase, SET4);
outb(0, iobase+IR_MSL);
/* Clear timer event */
/* switch_bank(iobase, SET0); */
/* outb(ASCR_CTE, iobase+ASCR); */
/* Check if this is a TX timer interrupt */
if (self->io.direction == IO_XMIT) {
w83977af_dma_write(self, iobase);
new_icr |= ICR_EDMAI;
} else {
/* Check if DMA has now finished */
w83977af_dma_receive_complete(self);
new_icr |= ICR_EFSFI;
}
}
/* Finished with DMA */
if (isr & ISR_DMA_I) {
w83977af_dma_xmit_complete(self);
/* Check if there are more frames to be transmitted */
/* if (irda_device_txqueue_empty(self)) { */
/* Prepare for receive
*
* ** Netwinder Tx DMA likes that we do this anyway **
*/
w83977af_dma_receive(self);
new_icr = ICR_EFSFI;
/* } */
}
/* Restore set */
outb(set, iobase+SSR);
return new_icr;
}
/*
* Function w83977af_interrupt (irq, dev_id, regs)
*
* An interrupt from the chip has arrived. Time to do some work
*
*/
static irqreturn_t w83977af_interrupt(int irq, void *dev_id)
{
struct net_device *dev = dev_id;
struct w83977af_ir *self;
__u8 set, icr, isr;
int iobase;
self = dev->priv;
iobase = self->io.fir_base;
/* Save current bank */
set = inb(iobase+SSR);
switch_bank(iobase, SET0);
icr = inb(iobase+ICR);
isr = inb(iobase+ISR) & icr; /* Mask out the interesting ones */
outb(0, iobase+ICR); /* Disable interrupts */
if (isr) {
/* Dispatch interrupt handler for the current speed */
if (self->io.speed > PIO_MAX_SPEED )
icr = w83977af_fir_interrupt(self, isr);
else
icr = w83977af_sir_interrupt(self, isr);
}
outb(icr, iobase+ICR); /* Restore (new) interrupts */
outb(set, iobase+SSR); /* Restore bank register */
return IRQ_RETVAL(isr);
}
/*
* Function w83977af_is_receiving (self)
*
* Return TRUE is we are currently receiving a frame
*
*/
static int w83977af_is_receiving(struct w83977af_ir *self)
{
int status = FALSE;
int iobase;
__u8 set;
IRDA_ASSERT(self != NULL, return FALSE;);
if (self->io.speed > 115200) {
iobase = self->io.fir_base;
/* Check if rx FIFO is not empty */
set = inb(iobase+SSR);
switch_bank(iobase, SET2);
if ((inb(iobase+RXFDTH) & 0x3f) != 0) {
/* We are receiving something */
status = TRUE;
}
outb(set, iobase+SSR);
} else
status = (self->rx_buff.state != OUTSIDE_FRAME);
return status;
}
/*
* Function w83977af_net_open (dev)
*
* Start the device
*
*/
static int w83977af_net_open(struct net_device *dev)
{
struct w83977af_ir *self;
int iobase;
char hwname[32];
__u8 set;
IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
IRDA_ASSERT(dev != NULL, return -1;);
self = (struct w83977af_ir *) dev->priv;
IRDA_ASSERT(self != NULL, return 0;);
iobase = self->io.fir_base;
if (request_irq(self->io.irq, w83977af_interrupt, 0, dev->name,
(void *) dev)) {
return -EAGAIN;
}
/*
* Always allocate the DMA channel after the IRQ,
* and clean up on failure.
*/
if (request_dma(self->io.dma, dev->name)) {
free_irq(self->io.irq, self);
return -EAGAIN;
}
/* Save current set */
set = inb(iobase+SSR);
/* Enable some interrupts so we can receive frames again */
switch_bank(iobase, SET0);
if (self->io.speed > 115200) {
outb(ICR_EFSFI, iobase+ICR);
w83977af_dma_receive(self);
} else
outb(ICR_ERBRI, iobase+ICR);
/* Restore bank register */
outb(set, iobase+SSR);
/* Ready to play! */
netif_start_queue(dev);
/* Give self a hardware name */
sprintf(hwname, "w83977af @ 0x%03x", self->io.fir_base);
/*
* Open new IrLAP layer instance, now that everything should be
* initialized properly
*/
self->irlap = irlap_open(dev, &self->qos, hwname);
return 0;
}
/*
* Function w83977af_net_close (dev)
*
* Stop the device
*
*/
static int w83977af_net_close(struct net_device *dev)
{
struct w83977af_ir *self;
int iobase;
__u8 set;
IRDA_DEBUG(0, "%s()\n", __FUNCTION__ );
IRDA_ASSERT(dev != NULL, return -1;);
self = (struct w83977af_ir *) dev->priv;
IRDA_ASSERT(self != NULL, return 0;);
iobase = self->io.fir_base;
/* Stop device */
netif_stop_queue(dev);
/* Stop and remove instance of IrLAP */
if (self->irlap)
irlap_close(self->irlap);
self->irlap = NULL;
disable_dma(self->io.dma);
/* Save current set */
set = inb(iobase+SSR);
/* Disable interrupts */
switch_bank(iobase, SET0);
outb(0, iobase+ICR);
free_irq(self->io.irq, dev);
free_dma(self->io.dma);
/* Restore bank register */
outb(set, iobase+SSR);
return 0;
}
/*
* Function w83977af_net_ioctl (dev, rq, cmd)
*
* Process IOCTL commands for this device
*
*/
static int w83977af_net_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
struct if_irda_req *irq = (struct if_irda_req *) rq;
struct w83977af_ir *self;
unsigned long flags;
int ret = 0;
IRDA_ASSERT(dev != NULL, return -1;);
self = dev->priv;
IRDA_ASSERT(self != NULL, return -1;);
IRDA_DEBUG(2, "%s(), %s, (cmd=0x%X)\n", __FUNCTION__ , dev->name, cmd);
spin_lock_irqsave(&self->lock, flags);
switch (cmd) {
case SIOCSBANDWIDTH: /* Set bandwidth */
if (!capable(CAP_NET_ADMIN)) {
ret = -EPERM;
goto out;
}
w83977af_change_speed(self, irq->ifr_baudrate);
break;
case SIOCSMEDIABUSY: /* Set media busy */
if (!capable(CAP_NET_ADMIN)) {
ret = -EPERM;
goto out;
}
irda_device_set_media_busy(self->netdev, TRUE);
break;
case SIOCGRECEIVING: /* Check if we are receiving right now */
irq->ifr_receiving = w83977af_is_receiving(self);
break;
default:
ret = -EOPNOTSUPP;
}
out:
spin_unlock_irqrestore(&self->lock, flags);
return ret;
}
static struct net_device_stats *w83977af_net_get_stats(struct net_device *dev)
{
struct w83977af_ir *self = (struct w83977af_ir *) dev->priv;
return &self->stats;
}
MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
MODULE_DESCRIPTION("Winbond W83977AF IrDA Device Driver");
MODULE_LICENSE("GPL");
module_param(qos_mtt_bits, int, 0);
MODULE_PARM_DESC(qos_mtt_bits, "Mimimum Turn Time");
module_param_array(io, int, NULL, 0);
MODULE_PARM_DESC(io, "Base I/O addresses");
module_param_array(irq, int, NULL, 0);
MODULE_PARM_DESC(irq, "IRQ lines");
/*
* Function init_module (void)
*
*
*
*/
module_init(w83977af_init);
/*
* Function cleanup_module (void)
*
*
*
*/
module_exit(w83977af_cleanup);
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