via82cxxx.c

ep9315平台下硬盘驱动的源码

/*
 *
 * Version 3.37
 *
 * VIA IDE driver for Linux. Supported southbridges:
 *
 *   vt82c576, vt82c586, vt82c586a, vt82c586b, vt82c596a, vt82c596b,
 *   vt82c686, vt82c686a, vt82c686b, vt8231, vt8233, vt8233c, vt8233a,
 *   vt8235, vt8237
 *
 * Copyright (c) 2000-2002 Vojtech Pavlik
 *
 * Based on the work of:
 *	Michel Aubry
 *	Jeff Garzik
 *	Andre Hedrick
 *
 * Documentation:
 *	Obsolete device documentation publically available from via.com.tw
 *	Current device documentation available under NDA only
 */

/*
 * 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.
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/blkdev.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/ide.h>
#include <asm/io.h>

#include "ide-timing.h"
#include "via82cxxx.h"

#define VIA_IDE_ENABLE		0x40
#define VIA_IDE_CONFIG		0x41
#define VIA_FIFO_CONFIG		0x43
#define VIA_MISC_1		0x44
#define VIA_MISC_2		0x45
#define VIA_MISC_3		0x46
#define VIA_DRIVE_TIMING	0x48
#define VIA_8BIT_TIMING		0x4e
#define VIA_ADDRESS_SETUP	0x4c
#define VIA_UDMA_TIMING		0x50

#define VIA_UDMA		0x007
#define VIA_UDMA_NONE		0x000
#define VIA_UDMA_33		0x001
#define VIA_UDMA_66		0x002
#define VIA_UDMA_100		0x003
#define VIA_UDMA_133		0x004
#define VIA_BAD_PREQ		0x010	/* Crashes if PREQ# till DDACK# set */
#define VIA_BAD_CLK66		0x020	/* 66 MHz clock doesn't work correctly */
#define VIA_SET_FIFO		0x040	/* Needs to have FIFO split set */
#define VIA_NO_UNMASK		0x080	/* Doesn't work with IRQ unmasking on */
#define VIA_BAD_ID		0x100	/* Has wrong vendor ID (0x1107) */
#define VIA_BAD_AST		0x200	/* Don't touch Address Setup Timing */

/*
 * VIA SouthBridge chips.
 */

static struct via_isa_bridge {
	char *name;
	u16 id;
	u8 rev_min;
	u8 rev_max;
	u16 flags;
} via_isa_bridges[] = {
	{ "vt8237",	PCI_DEVICE_ID_VIA_8237,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
	{ "vt8235",	PCI_DEVICE_ID_VIA_8235,     0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
	{ "vt8233a",	PCI_DEVICE_ID_VIA_8233A,    0x00, 0x2f, VIA_UDMA_133 | VIA_BAD_AST },
	{ "vt8233c",	PCI_DEVICE_ID_VIA_8233C_0,  0x00, 0x2f, VIA_UDMA_100 },
	{ "vt8233",	PCI_DEVICE_ID_VIA_8233_0,   0x00, 0x2f, VIA_UDMA_100 },
	{ "vt8231",	PCI_DEVICE_ID_VIA_8231,     0x00, 0x2f, VIA_UDMA_100 },
	{ "vt82c686b",	PCI_DEVICE_ID_VIA_82C686,   0x40, 0x4f, VIA_UDMA_100 },
	{ "vt82c686a",	PCI_DEVICE_ID_VIA_82C686,   0x10, 0x2f, VIA_UDMA_66 },
	{ "vt82c686",	PCI_DEVICE_ID_VIA_82C686,   0x00, 0x0f, VIA_UDMA_33 | VIA_BAD_CLK66 },
	{ "vt82c596b",	PCI_DEVICE_ID_VIA_82C596,   0x10, 0x2f, VIA_UDMA_66 },
	{ "vt82c596a",	PCI_DEVICE_ID_VIA_82C596,   0x00, 0x0f, VIA_UDMA_33 | VIA_BAD_CLK66 },
	{ "vt82c586b",	PCI_DEVICE_ID_VIA_82C586_0, 0x47, 0x4f, VIA_UDMA_33 | VIA_SET_FIFO },
	{ "vt82c586b",	PCI_DEVICE_ID_VIA_82C586_0, 0x40, 0x46, VIA_UDMA_33 | VIA_SET_FIFO | VIA_BAD_PREQ },
	{ "vt82c586b",	PCI_DEVICE_ID_VIA_82C586_0, 0x30, 0x3f, VIA_UDMA_33 | VIA_SET_FIFO },
	{ "vt82c586a",	PCI_DEVICE_ID_VIA_82C586_0, 0x20, 0x2f, VIA_UDMA_33 | VIA_SET_FIFO },
	{ "vt82c586",	PCI_DEVICE_ID_VIA_82C586_0, 0x00, 0x0f, VIA_UDMA_NONE | VIA_SET_FIFO },
	{ "vt82c576",	PCI_DEVICE_ID_VIA_82C576,   0x00, 0x2f, VIA_UDMA_NONE | VIA_SET_FIFO | VIA_NO_UNMASK },
	{ "vt82c576",	PCI_DEVICE_ID_VIA_82C576,   0x00, 0x2f, VIA_UDMA_NONE | VIA_SET_FIFO | VIA_NO_UNMASK | VIA_BAD_ID },
	{ NULL }
};

static struct via_isa_bridge *via_config;
static unsigned char via_enabled;
static unsigned int via_80w;
static unsigned int via_clock;
static char *via_dma[] = { "MWDMA16", "UDMA33", "UDMA66", "UDMA100", "UDMA133" };

/*
 * VIA /proc entry.
 */

#if defined(DISPLAY_VIA_TIMINGS) && defined(CONFIG_PROC_FS)

#include <linux/stat.h>
#include <linux/proc_fs.h>

static u8 via_proc = 0;
static unsigned long via_base;
static struct pci_dev *bmide_dev, *isa_dev;

static char *via_control3[] = { "No limit", "64", "128", "192" };

#define via_print(format, arg...) p += sprintf(p, format "\n" , ## arg)
#define via_print_drive(name, format, arg...)\
	p += sprintf(p, name); for (i = 0; i < 4; i++) p += sprintf(p, format, ## arg); p += sprintf(p, "\n");


/**
 *	via_get_info		-	generate via /proc file 
 *	@buffer: buffer for data
 *	@addr: set to start of data to use
 *	@offset: current file offset
 *	@count: size of read
 *
 *	Fills in buffer with the debugging/configuration information for
 *	the VIA chipset tuning and attached drives
 */
 
static int via_get_info(char *buffer, char **addr, off_t offset, int count)
{
	int speed[4], cycle[4], setup[4], active[4], recover[4], den[4],
		 uen[4], udma[4], umul[4], active8b[4], recover8b[4];
	struct pci_dev *dev = bmide_dev;
	unsigned int v, u, i;
	int len;
	u16 c, w;
	u8 t, x;
	char *p = buffer;

	via_print("----------VIA BusMastering IDE Configuration"
		"----------------");

	via_print("Driver Version:                     3.37");
	via_print("South Bridge:                       VIA %s",
		via_config->name);

	pci_read_config_byte(isa_dev, PCI_REVISION_ID, &t);
	pci_read_config_byte(dev, PCI_REVISION_ID, &x);
	via_print("Revision:                           ISA %#x IDE %#x", t, x);
	via_print("Highest DMA rate:                   %s",
		via_dma[via_config->flags & VIA_UDMA]);

	via_print("BM-DMA base:                        %#lx", via_base);
	via_print("PCI clock:                          %d.%dMHz",
		via_clock / 1000, via_clock / 100 % 10);

	pci_read_config_byte(dev, VIA_MISC_1, &t);
	via_print("Master Read  Cycle IRDY:            %dws",
		(t & 64) >> 6);
	via_print("Master Write Cycle IRDY:            %dws",
		(t & 32) >> 5);
	via_print("BM IDE Status Register Read Retry:  %s",
		(t & 8) ? "yes" : "no");

	pci_read_config_byte(dev, VIA_MISC_3, &t);
	via_print("Max DRDY Pulse Width:               %s%s",
		via_control3[(t & 0x03)], (t & 0x03) ? " PCI clocks" : "");

	via_print("-----------------------Primary IDE"
		"-------Secondary IDE------");
	via_print("Read DMA FIFO flush:   %10s%20s",
		(t & 0x80) ? "yes" : "no", (t & 0x40) ? "yes" : "no");
	via_print("End Sector FIFO flush: %10s%20s",
		(t & 0x20) ? "yes" : "no", (t & 0x10) ? "yes" : "no");

	pci_read_config_byte(dev, VIA_IDE_CONFIG, &t);
	via_print("Prefetch Buffer:       %10s%20s",
		(t & 0x80) ? "yes" : "no", (t & 0x20) ? "yes" : "no");
	via_print("Post Write Buffer:     %10s%20s",
		(t & 0x40) ? "yes" : "no", (t & 0x10) ? "yes" : "no");

	pci_read_config_byte(dev, VIA_IDE_ENABLE, &t);
	via_print("Enabled:               %10s%20s",
		(t & 0x02) ? "yes" : "no", (t & 0x01) ? "yes" : "no");

	c = inb(via_base + 0x02) | (inb(via_base + 0x0a) << 8);
	via_print("Simplex only:          %10s%20s",
		(c & 0x80) ? "yes" : "no", (c & 0x8000) ? "yes" : "no");

	via_print("Cable Type:            %10s%20s",
		(via_80w & 1) ? "80w" : "40w", (via_80w & 2) ? "80w" : "40w");

	via_print("-------------------drive0----drive1"
		"----drive2----drive3-----");

	pci_read_config_byte(dev, VIA_ADDRESS_SETUP, &t);
	pci_read_config_dword(dev, VIA_DRIVE_TIMING, &v);
	pci_read_config_word(dev, VIA_8BIT_TIMING, &w);

	if (via_config->flags & VIA_UDMA)
		pci_read_config_dword(dev, VIA_UDMA_TIMING, &u);
	else u = 0;

	for (i = 0; i < 4; i++) {

		setup[i]     = ((t >> ((3 - i) << 1)) & 0x3) + 1;
		recover8b[i] = ((w >> ((1 - (i >> 1)) << 3)) & 0xf) + 1;
		active8b[i]  = ((w >> (((1 - (i >> 1)) << 3) + 4)) & 0xf) + 1;
		active[i]    = ((v >> (((3 - i) << 3) + 4)) & 0xf) + 1;
		recover[i]   = ((v >> ((3 - i) << 3)) & 0xf) + 1;
		udma[i]      = ((u >> ((3 - i) << 3)) & 0x7) + 2;
		umul[i]      = ((u >> (((3 - i) & 2) << 3)) & 0x8) ? 1 : 2;
		uen[i]       = ((u >> ((3 - i) << 3)) & 0x20);
		den[i]       = (c & ((i & 1) ? 0x40 : 0x20) << ((i & 2) << 2));

		speed[i] = 2 * via_clock / (active[i] + recover[i]);
		cycle[i] = 1000000 * (active[i] + recover[i]) / via_clock;

		if (!uen[i] || !den[i])
			continue;

		switch (via_config->flags & VIA_UDMA) {

			case VIA_UDMA_33:
				speed[i] = 2 * via_clock / udma[i];
				cycle[i] = 1000000 * udma[i] / via_clock;
				break;

			case VIA_UDMA_66:
				speed[i] = 4 * via_clock / (udma[i] * umul[i]);
				cycle[i] = 500000 * (udma[i] * umul[i]) / via_clock;
				break;

			case VIA_UDMA_100:
				speed[i] = 6 * via_clock / udma[i];
				cycle[i] = 333333 * udma[i] / via_clock;
				break;

			case VIA_UDMA_133:
				speed[i] = 8 * via_clock / udma[i];
				cycle[i] = 250000 * udma[i] / via_clock;
				break;
		}
	}

	via_print_drive("Transfer Mode: ", "%10s",
		den[i] ? (uen[i] ? "UDMA" : "DMA") : "PIO");

	via_print_drive("Address Setup: ", "%8dns",
		1000000 * setup[i] / via_clock);
	via_print_drive("Cmd Active:    ", "%8dns",
		1000000 * active8b[i] / via_clock);
	via_print_drive("Cmd Recovery:  ", "%8dns",
		1000000 * recover8b[i] / via_clock);
	via_print_drive("Data Active:   ", "%8dns",
		1000000 * active[i] / via_clock);
	via_print_drive("Data Recovery: ", "%8dns",
		1000000 * recover[i] / via_clock);
	via_print_drive("Cycle Time:    ", "%8dns",
		cycle[i]);
	via_print_drive("Transfer Rate: ", "%4d.%dMB/s",
		speed[i] / 1000, speed[i] / 100 % 10);

	/* hoping it is less than 4K... */
	len = (p - buffer) - offset;
	*addr = buffer + offset;

	return len > count ? count : len;
}

#endif /* DISPLAY_VIA_TIMINGS && CONFIG_PROC_FS */

/**
 *	via_set_speed			-	write timing registers
 *	@dev: PCI device
 *	@dn: device
 *	@timing: IDE timing data to use
 *
 *	via_set_speed writes timing values to the chipset registers
 */

static void via_set_speed(struct pci_dev *dev, u8 dn, struct ide_timing *timing)
{
	u8 t;

	if (~via_config->flags & VIA_BAD_AST) {
		pci_read_config_byte(dev, VIA_ADDRESS_SETUP, &t);
		t = (t & ~(3 << ((3 - dn) << 1))) | ((FIT(timing->setup, 1, 4) - 1) << ((3 - dn) << 1));
		pci_write_config_byte(dev, VIA_ADDRESS_SETUP, t);
	}

	pci_write_config_byte(dev, VIA_8BIT_TIMING + (1 - (dn >> 1)),
		((FIT(timing->act8b, 1, 16) - 1) << 4) | (FIT(timing->rec8b, 1, 16) - 1));

	pci_write_config_byte(dev, VIA_DRIVE_TIMING + (3 - dn),
		((FIT(timing->active, 1, 16) - 1) << 4) | (FIT(timing->recover, 1, 16) - 1));

	switch (via_config->flags & VIA_UDMA) {
		case VIA_UDMA_33:  t = timing->udma ? (0xe0 | (FIT(timing->udma, 2, 5) - 2)) : 0x03; break;
		case VIA_UDMA_66:  t = timing->udma ? (0xe8 | (FIT(timing->udma, 2, 9) - 2)) : 0x0f; break;
		case VIA_UDMA_100: t = timing->udma ? (0xe0 | (FIT(timing->udma, 2, 9) - 2)) : 0x07; break;
		case VIA_UDMA_133: t = timing->udma ? (0xe0 | (FIT(timing->udma, 2, 9) - 2)) : 0x07; break;
		default: return;
	}

	pci_write_config_byte(dev, VIA_UDMA_TIMING + (3 - dn), t);
}

/**
 *	via_set_drive		-	configure transfer mode
 *	@drive: Drive to set up
 *	@speed: desired speed
 *
 *	via_set_drive() computes timing values configures the drive and
 *	the chipset to a desired transfer mode. It also can be called
 *	by upper layers.
 */

static int via_set_drive(ide_drive_t *drive, u8 speed)
{
	ide_drive_t *peer = HWIF(drive)->drives + (~drive->dn & 1);
	struct ide_timing t, p;
	unsigned int T, UT;

	if (speed != XFER_PIO_SLOW && speed != drive->current_speed)
		if (ide_config_drive_speed(drive, speed))
			printk(KERN_WARNING "ide%d: Drive %d didn't "
				"accept speed setting. Oh, well.\n",
				drive->dn >> 1, drive->dn & 1);