cs5520.c 7.2 KB
Newer Older
L
Linus Torvalds 已提交
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68
/*
 *	IDE tuning and bus mastering support for the CS5510/CS5520
 *	chipsets
 *
 *	The CS5510/CS5520 are slightly unusual devices. Unlike the 
 *	typical IDE controllers they do bus mastering with the drive in
 *	PIO mode and smarter silicon.
 *
 *	The practical upshot of this is that we must always tune the
 *	drive for the right PIO mode. We must also ignore all the blacklists
 *	and the drive bus mastering DMA information.
 *
 *	*** This driver is strictly experimental ***
 *
 *	(c) Copyright Red Hat Inc 2002
 * 
 * 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, or (at your option) any
 * later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * For the avoidance of doubt the "preferred form" of this code is one which
 * is in an open non patent encumbered format. Where cryptographic key signing
 * forms part of the process of creating an executable the information
 * including keys needed to generate an equivalently functional executable
 * are deemed to be part of the source code.
 *
 */
 
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/mm.h>
#include <linux/ioport.h>
#include <linux/blkdev.h>
#include <linux/hdreg.h>

#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/ide.h>
#include <linux/dma-mapping.h>

#include <asm/io.h>
#include <asm/irq.h>

struct pio_clocks
{
	int address;
	int assert;
	int recovery;
};

static struct pio_clocks cs5520_pio_clocks[]={
	{3, 6, 11},
	{2, 5, 6},
	{1, 4, 3},
	{1, 3, 2},
	{1, 2, 1}
};

69
static int cs5520_tune_chipset(ide_drive_t *drive, const u8 speed)
L
Linus Torvalds 已提交
70 71 72 73 74 75 76
{
	ide_hwif_t *hwif = HWIF(drive);
	struct pci_dev *pdev = hwif->pci_dev;
	int pio = speed;
	u8 reg;
	int controller = drive->dn > 1 ? 1 : 0;
	int error;
77

L
Linus Torvalds 已提交
78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127
	switch(speed)
	{
		case XFER_PIO_4:
		case XFER_PIO_3:
		case XFER_PIO_2:
		case XFER_PIO_1:
		case XFER_PIO_0:
			pio -= XFER_PIO_0;
			break;
		default:
			pio = 0;
			printk(KERN_ERR "cs55x0: bad ide timing.\n");
	}
	
	printk("PIO clocking = %d\n", pio);
	
	/* FIXME: if DMA = 1 do we need to set the DMA bit here ? */

	/* 8bit CAT/CRT - 8bit command timing for channel */
	pci_write_config_byte(pdev, 0x62 + controller, 
		(cs5520_pio_clocks[pio].recovery << 4) |
		(cs5520_pio_clocks[pio].assert));

	/* 0x64 - 16bit Primary, 0x68 - 16bit Secondary */

	/* FIXME: should these use address ? */
	/* Data read timing */
	pci_write_config_byte(pdev, 0x64 + 4*controller + (drive->dn&1),
		(cs5520_pio_clocks[pio].recovery << 4) |
		(cs5520_pio_clocks[pio].assert));
	/* Write command timing */
	pci_write_config_byte(pdev, 0x66 + 4*controller + (drive->dn&1),
		(cs5520_pio_clocks[pio].recovery << 4) |
		(cs5520_pio_clocks[pio].assert));
		
	/* Set the DMA enable/disable flag */
	reg = inb(hwif->dma_base + 0x02 + 8*controller);
	reg |= 1<<((drive->dn&1)+5);
	outb(reg, hwif->dma_base + 0x02 + 8*controller);
		
	error = ide_config_drive_speed(drive, speed);
	/* ATAPI is harder so leave it for now */
	if(!error && drive->media == ide_disk)
		error = hwif->ide_dma_on(drive);

	return error;
}	
	
static void cs5520_tune_drive(ide_drive_t *drive, u8 pio)
{
128
	pio = ide_get_best_pio_mode(drive, pio, 4);
L
Linus Torvalds 已提交
129 130 131 132 133 134
	cs5520_tune_chipset(drive, (XFER_PIO_0 + pio));
}

static int cs5520_config_drive_xfer_rate(ide_drive_t *drive)
{
	/* Tune the drive for PIO modes up to PIO 4 */	
135
	cs5520_tune_drive(drive, 255);
136

L
Linus Torvalds 已提交
137
	/* Then tell the core to use DMA operations */
138
	return 0;
L
Linus Torvalds 已提交
139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197
}

/*
 *	We provide a callback for our nonstandard DMA location
 */

static void __devinit cs5520_init_setup_dma(struct pci_dev *dev, ide_pci_device_t *d, ide_hwif_t *hwif)
{
	unsigned long bmide = pci_resource_start(dev, 2);	/* Not the usual 4 */
	if(hwif->mate && hwif->mate->dma_base)	/* Second channel at primary + 8 */
		bmide += 8;
	ide_setup_dma(hwif, bmide, 8);
}

/*
 *	We wrap the DMA activate to set the vdma flag. This is needed
 *	so that the IDE DMA layer issues PIO not DMA commands over the
 *	DMA channel
 */
 
static int cs5520_dma_on(ide_drive_t *drive)
{
	drive->vdma = 1;
	return 0;
}

static void __devinit init_hwif_cs5520(ide_hwif_t *hwif)
{
	hwif->tuneproc = &cs5520_tune_drive;
	hwif->speedproc = &cs5520_tune_chipset;
	hwif->ide_dma_check = &cs5520_config_drive_xfer_rate;
	hwif->ide_dma_on = &cs5520_dma_on;

	if(!noautodma)
		hwif->autodma = 1;
	
	if(!hwif->dma_base)
	{
		hwif->drives[0].autotune = 1;
		hwif->drives[1].autotune = 1;
		return;
	}
	
	hwif->atapi_dma = 0;
	hwif->ultra_mask = 0;
	hwif->swdma_mask = 0;
	hwif->mwdma_mask = 0;
	
	hwif->drives[0].autodma = hwif->autodma;
	hwif->drives[1].autodma = hwif->autodma;
}

#define DECLARE_CS_DEV(name_str)				\
	{							\
		.name		= name_str,			\
		.init_setup_dma = cs5520_init_setup_dma,	\
		.init_hwif	= init_hwif_cs5520,		\
		.autodma	= AUTODMA,			\
		.bootable	= ON_BOARD,			\
198
		.host_flags	= IDE_HFLAG_ISA_PORTS,		\
B
Bartlomiej Zolnierkiewicz 已提交
199
		.pio_mask	= ATA_PIO4,			\
L
Linus Torvalds 已提交
200 201 202 203 204 205 206 207 208 209 210 211 212 213 214
	}

static ide_pci_device_t cyrix_chipsets[] __devinitdata = {
	/* 0 */ DECLARE_CS_DEV("Cyrix 5510"),
	/* 1 */ DECLARE_CS_DEV("Cyrix 5520")
};

/*
 *	The 5510/5520 are a bit weird. They don't quite set up the way
 *	the PCI helper layer expects so we must do much of the set up 
 *	work longhand.
 */
 
static int __devinit cs5520_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
215
	ide_hwif_t *hwif = NULL, *mate = NULL;
L
Linus Torvalds 已提交
216 217 218 219 220 221 222
	ata_index_t index;
	ide_pci_device_t *d = &cyrix_chipsets[id->driver_data];

	ide_setup_pci_noise(dev, d);

	/* We must not grab the entire device, it has 'ISA' space in its
	   BARS too and we will freak out other bits of the kernel */
223
	if (pci_enable_device_bars(dev, 1<<2)) {
L
Linus Torvalds 已提交
224
		printk(KERN_WARNING "%s: Unable to enable 55x0.\n", d->name);
225
		return -ENODEV;
L
Linus Torvalds 已提交
226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241
	}
	pci_set_master(dev);
	if (pci_set_dma_mask(dev, DMA_32BIT_MASK)) {
		printk(KERN_WARNING "cs5520: No suitable DMA available.\n");
		return -ENODEV;
	}

	index.all = 0xf0f0;

	/*
	 *	Now the chipset is configured we can let the core
	 *	do all the device setup for us
	 */

	ide_pci_setup_ports(dev, d, 14, &index);

242 243 244 245 246 247 248 249 250 251 252 253 254 255 256
	if ((index.b.low & 0xf0) != 0xf0)
		hwif = &ide_hwifs[index.b.low];
	if ((index.b.high & 0xf0) != 0xf0)
		mate = &ide_hwifs[index.b.high];

	if (hwif)
		probe_hwif_init(hwif);
	if (mate)
		probe_hwif_init(mate);

	if (hwif)
		ide_proc_register_port(hwif);
	if (mate)
		ide_proc_register_port(mate);

L
Linus Torvalds 已提交
257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272
	return 0;
}

static struct pci_device_id cs5520_pci_tbl[] = {
	{ PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5510, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
	{ PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5520, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 1},
	{ 0, },
};
MODULE_DEVICE_TABLE(pci, cs5520_pci_tbl);

static struct pci_driver driver = {
	.name		= "Cyrix_IDE",
	.id_table	= cs5520_pci_tbl,
	.probe		= cs5520_init_one,
};

273
static int __init cs5520_ide_init(void)
L
Linus Torvalds 已提交
274 275 276 277 278 279 280 281 282
{
	return ide_pci_register_driver(&driver);
}

module_init(cs5520_ide_init);

MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("PCI driver module for Cyrix 5510/5520 IDE");
MODULE_LICENSE("GPL");