w83977af_ir.c

《linux驱动程序设计从入门到精通》一书中所有的程序代码含驱动和相应的应用程序

/*********************************************************************
 *                
 * 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 <[e-mail]>
 * 
 *     Copyright (c) 1998-2000 Dag Brattli <[e-mail]>
 *     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;