/*
* 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/config.h>
#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}
};
static int cs5520_tune_chipset(ide_drive_t *drive, u8 xferspeed)
{
ide_hwif_t *hwif = HWIF(drive);
struct pci_dev *pdev = hwif->pci_dev;
u8 speed = min((u8)XFER_PIO_4, xferspeed);
int pio = speed;
u8 reg;
int controller = drive->dn > 1 ? 1 : 0;
int error;
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)
{
pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
cs5520_tune_chipset(drive, (XFER_PIO_0 + pio));
}
static int cs5520_config_drive_xfer_rate(ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
/* Tune the drive for PIO modes up to PIO 4 */
cs5520_tune_drive(drive, 4);
/* Then tell the core to use DMA operations */
return hwif->ide_dma_on(drive);
}
/*
* 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, \
.channels = 2, \
.autodma = AUTODMA, \
.bootable = ON_BOARD, \
.flags = IDEPCI_FLAG_ISA_PORTS, \
}
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)
{
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 */
if(pci_enable_device_bars(dev, 1<<2))
{
printk(KERN_WARNING "%s: Unable to enable 55x0.\n", d->name);
return 1;
}
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);
if((index.b.low & 0xf0) != 0xf0)
probe_hwif_init(&ide_hwifs[index.b.low]);
if((index.b.high & 0xf0) != 0xf0)
probe_hwif_init(&ide_hwifs[index.b.high]);
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,
};
static int cs5520_ide_init(void)
{
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");
