/*
* linux/drivers/ide/pci/piix.c Version 0.53 Aug 9, 2007
*
* Copyright (C) 1998-1999 Andrzej Krzysztofowicz, Author and Maintainer
* Copyright (C) 1998-2000 Andre Hedrick <andre@linux-ide.org>
* Copyright (C) 2003 Red Hat Inc <alan@redhat.com>
* Copyright (C) 2006-2007 MontaVista Software, Inc. <source@mvista.com>
*
* May be copied or modified under the terms of the GNU General Public License
*
* PIO mode setting function for Intel chipsets.
* For use instead of BIOS settings.
*
* 40-41
* 42-43
*
* 41
* 43
*
* | PIO 0 | c0 | 80 | 0 |
* | PIO 2 | SW2 | d0 | 90 | 4 |
* | PIO 3 | MW1 | e1 | a1 | 9 |
* | PIO 4 | MW2 | e3 | a3 | b |
*
* sitre = word40 & 0x4000; primary
* sitre = word42 & 0x4000; secondary
*
* 44 8421|8421 hdd|hdb
*
* 48 8421 hdd|hdc|hdb|hda udma enabled
*
* 0001 hda
* 0010 hdb
* 0100 hdc
* 1000 hdd
*
* 4a 84|21 hdb|hda
* 4b 84|21 hdd|hdc
*
* ata-33/82371AB
* ata-33/82371EB
* ata-33/82801AB ata-66/82801AA
* 00|00 udma 0 00|00 reserved
* 01|01 udma 1 01|01 udma 3
* 10|10 udma 2 10|10 udma 4
* 11|11 reserved 11|11 reserved
*
* 54 8421|8421 ata66 drive|ata66 enable
*
* pci_read_config_word(HWIF(drive)->pci_dev, 0x40, ®40);
* pci_read_config_word(HWIF(drive)->pci_dev, 0x42, ®42);
* pci_read_config_word(HWIF(drive)->pci_dev, 0x44, ®44);
* pci_read_config_byte(HWIF(drive)->pci_dev, 0x48, ®48);
* pci_read_config_word(HWIF(drive)->pci_dev, 0x4a, ®4a);
* pci_read_config_byte(HWIF(drive)->pci_dev, 0x54, ®54);
*
* Documentation
* Publically available from Intel web site. Errata documentation
* is also publically available. As an aide to anyone hacking on this
* driver the list of errata that are relevant is below.going back to
* PIIX4. Older device documentation is now a bit tricky to find.
*
* Errata of note:
*
* Unfixable
* PIIX4 errata #9 - Only on ultra obscure hw
* ICH3 errata #13 - Not observed to affect real hw
* by Intel
*
* Things we must deal with
* PIIX4 errata #10 - BM IDE hang with non UDMA
* (must stop/start dma to recover)
* 440MX errata #15 - As PIIX4 errata #10
* PIIX4 errata #15 - Must not read control registers
* during a PIO transfer
* 440MX errata #13 - As PIIX4 errata #15
* ICH2 errata #21 - DMA mode 0 doesn't work right
* ICH0/1 errata #55 - As ICH2 errata #21
* ICH2 spec c #9 - Extra operations needed to handle
* drive hotswap [NOT YET SUPPORTED]
* ICH2 spec c #20 - IDE PRD must not cross a 64K boundary
* and must be dword aligned
* ICH2 spec c #24 - UDMA mode 4,5 t85/86 should be 6ns not 3.3
*
* Should have been BIOS fixed:
* 450NX: errata #19 - DMA hangs on old 450NX
* 450NX: errata #20 - DMA hangs on old 450NX
* 450NX: errata #25 - Corruption with DMA on old 450NX
* ICH3 errata #15 - IDE deadlock under high load
* (BIOS must set dev 31 fn 0 bit 23)
* ICH3 errata #18 - Don't use native mode
*/
#include <linux/types.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/ioport.h>
#include <linux/pci.h>
#include <linux/hdreg.h>
#include <linux/ide.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <asm/io.h>
static int no_piix_dma;
/**
* piix_set_pio_mode - set host controller for PIO mode
* @drive: drive
* @pio: PIO mode number
*
* Set the interface PIO mode based upon the settings done by AMI BIOS.
*/
static void piix_set_pio_mode(ide_drive_t *drive, const u8 pio)
{
ide_hwif_t *hwif = HWIF(drive);
struct pci_dev *dev = hwif->pci_dev;
int is_slave = drive->dn & 1;
int master_port = hwif->channel ? 0x42 : 0x40;
int slave_port = 0x44;
unsigned long flags;
u16 master_data;
u8 slave_data;
static DEFINE_SPINLOCK(tune_lock);
int control = 0;
/* ISP RTC */
static const u8 timings[][2]= {
{ 0, 0 },
{ 0, 0 },
{ 1, 0 },
{ 2, 1 },
{ 2, 3 }, };
/*
* Master vs slave is synchronized above us but the slave register is
* shared by the two hwifs so the corner case of two slave timeouts in
* parallel must be locked.
*/
spin_lock_irqsave(&tune_lock, flags);
pci_read_config_word(dev, master_port, &master_data);
if (pio > 1)
control |= 1; /* Programmable timing on */
if (drive->media == ide_disk)
control |= 4; /* Prefetch, post write */
if (pio > 2)
control |= 2; /* IORDY */
if (is_slave) {
master_data |= 0x4000;
master_data &= ~0x0070;
if (pio > 1) {
/* Set PPE, IE and TIME */
master_data |= control << 4;
}
pci_read_config_byte(dev, slave_port, &slave_data);
slave_data &= hwif->channel ? 0x0f : 0xf0;
slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) <<
(hwif->channel ? 4 : 0);
} else {
master_data &= ~0x3307;
if (pio > 1) {
/* enable PPE, IE and TIME */
master_data |= control;
}
master_data |= (timings[pio][0] << 12) | (timings[pio][1] << 8);
}
pci_write_config_word(dev, master_port, master_data);
if (is_slave)
pci_write_config_byte(dev, slave_port, slave_data);
spin_unlock_irqrestore(&tune_lock, flags);
}
/**
* piix_set_dma_mode - set host controller for DMA mode
* @drive: drive
* @speed: DMA mode
*
* Set a PIIX host controller to the desired DMA mode. This involves
* programming the right timing data into the PCI configuration space.
*/
static void piix_set_dma_mode(ide_drive_t *drive, const u8 speed)
{
ide_hwif_t *hwif = HWIF(drive);
struct pci_dev *dev = hwif->pci_dev;
u8 maslave = hwif->channel ? 0x42 : 0x40;
int a_speed = 3 << (drive->dn * 4);
int u_flag = 1 << drive->dn;
int v_flag = 0x01 << drive->dn;
int w_flag = 0x10 << drive->dn;
int u_speed = 0;
int sitre;
u16 reg4042, reg4a;
u8 reg48, reg54, reg55;
pci_read_config_word(dev, maslave, ®4042);
sitre = (reg4042 & 0x4000) ? 1 : 0;
pci_read_config_byte(dev, 0x48, ®48);
pci_read_config_word(dev, 0x4a, ®4a);
pci_read_config_byte(dev, 0x54, ®54);
pci_read_config_byte(dev, 0x55, ®55);
switch(speed) {
case XFER_UDMA_4:
case XFER_UDMA_2: u_speed = 2 << (drive->dn * 4); break;
case XFER_UDMA_5:
case XFER_UDMA_3:
case XFER_UDMA_1: u_speed = 1 << (drive->dn * 4); break;
case XFER_UDMA_0: u_speed = 0 << (drive->dn * 4); break;
case XFER_MW_DMA_2:
case XFER_MW_DMA_1:
case XFER_SW_DMA_2: break;
default: return;
}
if (speed >= XFER_UDMA_0) {
if (!(reg48 & u_flag))
pci_write_config_byte(dev, 0x48, reg48 | u_flag);
if (speed == XFER_UDMA_5) {
pci_write_config_byte(dev, 0x55, (u8) reg55|w_flag);
} else {
pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);
}
if ((reg4a & a_speed) != u_speed)
pci_write_config_word(dev, 0x4a, (reg4a & ~a_speed) | u_speed);
if (speed > XFER_UDMA_2) {
if (!(reg54 & v_flag))
pci_write_config_byte(dev, 0x54, reg54 | v_flag);
} else
pci_write_config_byte(dev, 0x54, reg54 & ~v_flag);
} else {
const u8 mwdma_to_pio[] = { 0, 3, 4 };
u8 pio;
if (reg48 & u_flag)
pci_write_config_byte(dev, 0x48, reg48 & ~u_flag);
if (reg4a & a_speed)
pci_write_config_word(dev, 0x4a, reg4a & ~a_speed);
if (reg54 & v_flag)
pci_write_config_byte(dev, 0x54, reg54 & ~v_flag);
if (reg55 & w_flag)
pci_write_config_byte(dev, 0x55, (u8) reg55 & ~w_flag);
if (speed >= XFER_MW_DMA_0)
pio = mwdma_to_pio[speed - XFER_MW_DMA_0];
else
pio = 2; /* only SWDMA2 is allowed */
piix_set_pio_mode(drive, pio);
}
}
/**
* piix_is_ichx - check if ICHx
* @dev: PCI device to check
*
* returns 1 if ICHx, 0 otherwise.
*/
static int piix_is_ichx(struct pci_dev *dev)
{
switch (dev->device) {
case PCI_DEVICE_ID_INTEL_82801EB_1:
case PCI_DEVICE_ID_INTEL_82801AA_1:
case PCI_DEVICE_ID_INTEL_82801AB_1:
case PCI_DEVICE_ID_INTEL_82801BA_8:
case PCI_DEVICE_ID_INTEL_82801BA_9:
case PCI_DEVICE_ID_INTEL_82801CA_10:
case PCI_DEVICE_ID_INTEL_82801CA_11:
case PCI_DEVICE_ID_INTEL_82801DB_1:
case PCI_DEVICE_ID_INTEL_82801DB_10:
case PCI_DEVICE_ID_INTEL_82801DB_11:
case PCI_DEVICE_ID_INTEL_82801EB_11:
case PCI_DEVICE_ID_INTEL_82801E_11:
case PCI_DEVICE_ID_INTEL_ESB_2:
case PCI_DEVICE_ID_INTEL_ICH6_19:
case PCI_DEVICE_ID_INTEL_ICH7_21:
case PCI_DEVICE_ID_INTEL_ESB2_18:
case PCI_DEVICE_ID_INTEL_ICH8_6:
return 1;
}
return 0;
}
/**
* init_chipset_piix - set up the PIIX chipset
* @dev: PCI device to set up
* @name: Name of the device
*
* Initialize the PCI device as required. For the PIIX this turns
* out to be nice and simple
*/
static unsigned int __devinit init_chipset_piix (struct pci_dev *dev, const char *name)
{
if (piix_is_ichx(dev)) {
unsigned int extra = 0;
pci_read_config_dword(dev, 0x54, &extra);
pci_write_config_dword(dev, 0x54, extra|0x400);
}
return 0;
}
/**
* piix_dma_clear_irq - clear BMDMA status
* @drive: IDE drive to clear
*
* Called from ide_intr() for PIO interrupts
* to clear BMDMA status as needed by ICHx
*/
static void piix_dma_clear_irq(ide_drive_t *drive)
{
ide_hwif_t *hwif = HWIF(drive);
u8 dma_stat;
/* clear the INTR & ERROR bits */
dma_stat = hwif->INB(hwif->dma_status);
/* Should we force the bit as well ? */
hwif->OUTB(dma_stat, hwif->dma_status);
}
struct ich_laptop {
u16 device;
u16 subvendor;
u16 subdevice;
};
/*
* List of laptops that use short cables rather than 80 wire
*/
static const struct ich_laptop ich_laptop[] = {
/* devid, subvendor, subdev */
{ 0x27DF, 0x0005, 0x0280 }, /* ICH7 on Acer 5602WLMi */
{ 0x27DF, 0x1025, 0x0110 }, /* ICH7 on Acer 3682WLMi */
{ 0x27DF, 0x1043, 0x1267 }, /* ICH7 on Asus W5F */
{ 0x24CA, 0x1025, 0x0061 }, /* ICH4 on Acer Aspire 2023WLMi */
/* end marker */
{ 0, }
};
static u8 __devinit piix_cable_detect(ide_hwif_t *hwif)
{
struct pci_dev *pdev = hwif->pci_dev;
const struct ich_laptop *lap = &ich_laptop[0];
u8 reg54h = 0, mask = hwif->channel ? 0xc0 : 0x30;
/* check for specials */
while (lap->device) {
if (lap->device == pdev->device &&
lap->subvendor == pdev->subsystem_vendor &&
lap->subdevice == pdev->subsystem_device) {
return ATA_CBL_PATA40_SHORT;
}
lap++;
}
pci_read_config_byte(pdev, 0x54, ®54h);
return (reg54h & mask) ? ATA_CBL_PATA80 : ATA_CBL_PATA40;
}
/**
* init_hwif_piix - fill in the hwif for the PIIX
* @hwif: IDE interface
*
* Set up the ide_hwif_t for the PIIX interface according to the
* capabilities of the hardware.
*/
static void __devinit init_hwif_piix(ide_hwif_t *hwif)
{
#ifndef CONFIG_IA64
if (!hwif->irq)
hwif->irq = hwif->channel ? 15 : 14;
#endif /* CONFIG_IA64 */
if (hwif->pci_dev->device == PCI_DEVICE_ID_INTEL_82371MX) {
/* This is a painful system best to let it self tune for now */
return;
}
hwif->autodma = 0;
hwif->set_pio_mode = &piix_set_pio_mode;
hwif->set_dma_mode = &piix_set_dma_mode;
hwif->drives[0].autotune = 1;
hwif->drives[1].autotune = 1;
if (!hwif->dma_base)
return;
/* ICHx need to clear the bmdma status for all interrupts */
if (piix_is_ichx(hwif->pci_dev))
hwif->ide_dma_clear_irq = &piix_dma_clear_irq;
hwif->atapi_dma = 1;
hwif->ultra_mask = hwif->cds->udma_mask;
hwif->mwdma_mask = 0x06;
hwif->swdma_mask = 0x04;
if (hwif->ultra_mask & 0x78) {
if (hwif->cbl != ATA_CBL_PATA40_SHORT)
hwif->cbl = piix_cable_detect(hwif);
}
if (no_piix_dma)
hwif->ultra_mask = hwif->mwdma_mask = hwif->swdma_mask = 0;
if (!noautodma)
hwif->autodma = 1;
hwif->drives[1].autodma = hwif->autodma;
hwif->drives[0].autodma = hwif->autodma;
}
#define DECLARE_PIIX_DEV(name_str, udma) \
{ \
.name = name_str, \
.init_chipset = init_chipset_piix, \
.init_hwif = init_hwif_piix, \
.autodma = AUTODMA, \
.enablebits = {{0x41,0x80,0x80}, {0x43,0x80,0x80}}, \
.bootable = ON_BOARD, \
.pio_mask = ATA_PIO4, \
.udma_mask = udma, \
}
static ide_pci_device_t piix_pci_info[] __devinitdata = {
/* 0 */ DECLARE_PIIX_DEV("PIIXa", 0x00), /* no udma */
/* 1 */ DECLARE_PIIX_DEV("PIIXb", 0x00), /* no udma */
/* 2 */
{ /*
* MPIIX actually has only a single IDE channel mapped to
* the primary or secondary ports depending on the value
* of the bit 14 of the IDETIM register at offset 0x6c
*/
.name = "MPIIX",
.init_hwif = init_hwif_piix,
.autodma = NODMA,
.enablebits = {{0x6d,0xc0,0x80}, {0x6d,0xc0,0xc0}},
.bootable = ON_BOARD,
.host_flags = IDE_HFLAG_ISA_PORTS,
.pio_mask = ATA_PIO4,
},
/* 3 */ DECLARE_PIIX_DEV("PIIX3", 0x00), /* no udma */
/* 4 */ DECLARE_PIIX_DEV("PIIX4", 0x07), /* udma0-2 */
/* 5 */ DECLARE_PIIX_DEV("ICH0", 0x07), /* udma0-2 */
/* 6 */ DECLARE_PIIX_DEV("PIIX4", 0x07), /* udma0-2 */
/* 7 */ DECLARE_PIIX_DEV("ICH", 0x1f), /* udma0-4 */
/* 8 */ DECLARE_PIIX_DEV("PIIX4", 0x1f), /* udma0-4 */
/* 9 */ DECLARE_PIIX_DEV("PIIX4", 0x07), /* udma0-2 */
/* 10 */ DECLARE_PIIX_DEV("ICH2", 0x3f), /* udma0-5 */
/* 11 */ DECLARE_PIIX_DEV("ICH2M", 0x3f), /* udma0-5 */
/* 12 */ DECLARE_PIIX_DEV("ICH3M", 0x3f), /* udma0-5 */
/* 13 */ DECLARE_PIIX_DEV("ICH3", 0x3f), /* udma0-5 */
/* 14 */ DECLARE_PIIX_DEV("ICH4", 0x3f), /* udma0-5 */
/* 15 */ DECLARE_PIIX_DEV("ICH5", 0x3f), /* udma0-5 */
/* 16 */ DECLARE_PIIX_DEV("C-ICH", 0x3f), /* udma0-5 */
/* 17 */ DECLARE_PIIX_DEV("ICH4", 0x3f), /* udma0-5 */
/* 18 */ DECLARE_PIIX_DEV("ICH5-SATA", 0x3f), /* udma0-5 */
/* 19 */ DECLARE_PIIX_DEV("ICH5", 0x3f), /* udma0-5 */
/* 20 */ DECLARE_PIIX_DEV("ICH6", 0x3f), /* udma0-5 */
/* 21 */ DECLARE_PIIX_DEV("ICH7", 0x3f), /* udma0-5 */
/* 22 */ DECLARE_PIIX_DEV("ICH4", 0x3f), /* udma0-5 */
/* 23 */ DECLARE_PIIX_DEV("ESB2", 0x3f), /* udma0-5 */
/* 24 */ DECLARE_PIIX_DEV("ICH8M", 0x3f), /* udma0-5 */
};
/**
* piix_init_one - called when a PIIX is found
* @dev: the piix device
* @id: the matching pci id
*
* Called when the PCI registration layer (or the IDE initialization)
* finds a device matching our IDE device tables.
*/
static int __devinit piix_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
ide_pci_device_t *d = &piix_pci_info[id->driver_data];
return ide_setup_pci_device(dev, d);
}
/**
* piix_check_450nx - Check for problem 450NX setup
*
* Check for the present of 450NX errata #19 and errata #25. If
* they are found, disable use of DMA IDE
*/
static void __devinit piix_check_450nx(void)
{
struct pci_dev *pdev = NULL;
u16 cfg;
while((pdev=pci_get_device(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82454NX, pdev))!=NULL)
{
/* Look for 450NX PXB. Check for problem configurations
A PCI quirk checks bit 6 already */
pci_read_config_word(pdev, 0x41, &cfg);
/* Only on the original revision: IDE DMA can hang */
if (pdev->revision == 0x00)
no_piix_dma = 1;
/* On all revisions below 5 PXB bus lock must be disabled for IDE */
else if (cfg & (1<<14) && pdev->revision < 5)
no_piix_dma = 2;
}
if(no_piix_dma)
printk(KERN_WARNING "piix: 450NX errata present, disabling IDE DMA.\n");
if(no_piix_dma == 2)
printk(KERN_WARNING "piix: A BIOS update may resolve this.\n");
}
static const struct pci_device_id piix_pci_tbl[] = {
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82371FB_0), 0 },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82371FB_1), 1 },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82371MX), 2 },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82371SB_1), 3 },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82371AB), 4 },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82801AB_1), 5 },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82443MX_1), 6 },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82801AA_1), 7 },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82372FB_1), 8 },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82451NX), 9 },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82801BA_9), 10 },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82801BA_8), 11 },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82801CA_10), 12 },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82801CA_11), 13 },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82801DB_11), 14 },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82801EB_11), 15 },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82801E_11), 16 },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82801DB_10), 17 },
#ifdef CONFIG_BLK_DEV_IDE_SATA
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82801EB_1), 18 },
#endif
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ESB_2), 19 },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ICH6_19), 20 },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ICH7_21), 21 },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_82801DB_1), 22 },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ESB2_18), 23 },
{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_ICH8_6), 24 },
{ 0, },
};
MODULE_DEVICE_TABLE(pci, piix_pci_tbl);
static struct pci_driver driver = {
.name = "PIIX_IDE",
.id_table = piix_pci_tbl,
.probe = piix_init_one,
};
static int __init piix_ide_init(void)
{
piix_check_450nx();
return ide_pci_register_driver(&driver);
}
module_init(piix_ide_init);
MODULE_AUTHOR("Andre Hedrick, Andrzej Krzysztofowicz");
MODULE_DESCRIPTION("PCI driver module for Intel PIIX IDE");
MODULE_LICENSE("GPL");
