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linux/drivers/net/irda/w83977af_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

1378 lines
33 KiB
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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 = (struct net_device *) dev_id;
struct w83977af_ir *self;
__u8 set, icr, isr;
int iobase;
if (!dev) {
printk(KERN_WARNING "%s: irq %d for unknown device.\n",
driver_name, irq);
return IRQ_NONE;
}
self = (struct w83977af_ir *) 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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