linux/drivers/ide/pci/it8213.c
Bartlomiej Zolnierkiewicz 3608b5d71a ide: add ide_set_dma() helper (v2)
* add ide_set_dma() helper and make ide_hwif_t.ide_dma_check return
  -1 when DMA needs to be disabled (== need to call ->ide_dma_off_quietly)
   0 when DMA needs to be enabled  (== need to call ->ide_dma_on)
   1 when DMA setting shouldn't be changed
* fix IDE code to use ide_set_dma() instead if using ->ide_dma_check directly

v2:
* updated for scc_pata

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
2007-02-17 02:40:26 +01:00

360 lines
8.4 KiB
C

/*
* ITE 8213 IDE driver
*
* Copyright (C) 2006 Jack Lee
* Copyright (C) 2006 Alan Cox
* Copyright (C) 2007 Bartlomiej Zolnierkiewicz
*/
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/hdreg.h>
#include <linux/ide.h>
#include <linux/init.h>
#include <asm/io.h>
/*
* it8213_ratemask - Compute available modes
* @drive: IDE drive
*
* Compute the available speeds for the devices on the interface. This
* is all modes to ATA133 clipped by drive cable setup.
*/
static u8 it8213_ratemask (ide_drive_t *drive)
{
u8 mode = 4;
if (!eighty_ninty_three(drive))
mode = min_t(u8, mode, 1);
return mode;
}
/**
* it8213_dma_2_pio - return the PIO mode matching DMA
* @xfer_rate: transfer speed
*
* Returns the nearest equivalent PIO timing for the PIO or DMA
* mode requested by the controller.
*/
static u8 it8213_dma_2_pio (u8 xfer_rate) {
switch(xfer_rate) {
case XFER_UDMA_6:
case XFER_UDMA_5:
case XFER_UDMA_4:
case XFER_UDMA_3:
case XFER_UDMA_2:
case XFER_UDMA_1:
case XFER_UDMA_0:
case XFER_MW_DMA_2:
case XFER_PIO_4:
return 4;
case XFER_MW_DMA_1:
case XFER_PIO_3:
return 3;
case XFER_SW_DMA_2:
case XFER_PIO_2:
return 2;
case XFER_MW_DMA_0:
case XFER_SW_DMA_1:
case XFER_SW_DMA_0:
case XFER_PIO_1:
case XFER_PIO_0:
case XFER_PIO_SLOW:
default:
return 0;
}
}
/*
* it8213_tuneproc - tune a drive
* @drive: drive to tune
* @pio: desired PIO mode
*
* Set the interface PIO mode.
*/
static void it8213_tuneproc (ide_drive_t *drive, u8 pio)
{
ide_hwif_t *hwif = HWIF(drive);
struct pci_dev *dev = hwif->pci_dev;
int is_slave = drive->dn & 1;
int master_port = 0x40;
int slave_port = 0x44;
unsigned long flags;
u16 master_data;
u8 slave_data;
static DEFINE_SPINLOCK(tune_lock);
int control = 0;
static const u8 timings[][2]= {
{ 0, 0 },
{ 0, 0 },
{ 1, 0 },
{ 2, 1 },
{ 2, 3 }, };
pio = ide_get_best_pio_mode(drive, pio, 4, NULL);
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; /* ATAPI */
if (pio > 2)
control |= 2; /* IORDY */
if (is_slave) {
master_data |= 0x4000;
master_data &= ~0x0070;
if (pio > 1)
master_data = master_data | (control << 4);
pci_read_config_byte(dev, slave_port, &slave_data);
slave_data = slave_data & 0xf0;
slave_data = slave_data | (timings[pio][0] << 2) | timings[pio][1];
} else {
master_data &= ~0x3307;
if (pio > 1)
master_data = master_data | control;
master_data = 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);
}
/**
* it8213_tune_chipset - set controller timings
* @drive: Drive to set up
* @xferspeed: speed we want to achieve
*
* Tune the ITE chipset for the desired mode. If we can't achieve
* the desired mode then tune for a lower one, but ultimately
* make the thing work.
*/
static int it8213_tune_chipset (ide_drive_t *drive, u8 xferspeed)
{
ide_hwif_t *hwif = HWIF(drive);
struct pci_dev *dev = hwif->pci_dev;
u8 maslave = 0x40;
u8 speed = ide_rate_filter(it8213_ratemask(drive), xferspeed);
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;
u16 reg4042, reg4a;
u8 reg48, reg54, reg55;
pci_read_config_word(dev, maslave, &reg4042);
pci_read_config_byte(dev, 0x48, &reg48);
pci_read_config_word(dev, 0x4a, &reg4a);
pci_read_config_byte(dev, 0x54, &reg54);
pci_read_config_byte(dev, 0x55, &reg55);
switch(speed) {
case XFER_UDMA_6:
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;
break;
case XFER_MW_DMA_2:
case XFER_MW_DMA_1:
case XFER_SW_DMA_2:
break;
case XFER_PIO_4:
case XFER_PIO_3:
case XFER_PIO_2:
case XFER_PIO_1:
case XFER_PIO_0:
break;
default:
return -1;
}
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 {
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);
}
it8213_tuneproc(drive, it8213_dma_2_pio(speed));
return ide_config_drive_speed(drive, speed);
}
/*
* config_chipset_for_dma - configure for DMA
* @drive: drive to configure
*
* Called by the IDE layer when it wants the timings set up.
*/
static int config_chipset_for_dma (ide_drive_t *drive)
{
u8 speed = ide_dma_speed(drive, it8213_ratemask(drive));
if (!speed)
return 0;
it8213_tune_chipset(drive, speed);
return ide_dma_enable(drive);
}
/**
* it8213_configure_drive_for_dma - set up for DMA transfers
* @drive: drive we are going to set up
*
* Set up the drive for DMA, tune the controller and drive as
* required. If the drive isn't suitable for DMA or we hit
* other problems then we will drop down to PIO and set up
* PIO appropriately
*/
static int it8213_config_drive_for_dma (ide_drive_t *drive)
{
u8 pio;
if (ide_use_dma(drive) && config_chipset_for_dma(drive))
return 0;
pio = ide_get_best_pio_mode(drive, 255, 4, NULL);
it8213_tune_chipset(drive, XFER_PIO_0 + pio);
return -1;
}
/**
* init_hwif_it8213 - set up hwif structs
* @hwif: interface to set up
*
* We do the basic set up of the interface structure. The IT8212
* requires several custom handlers so we override the default
* ide DMA handlers appropriately
*/
static void __devinit init_hwif_it8213(ide_hwif_t *hwif)
{
u8 reg42h = 0, ata66 = 0;
hwif->speedproc = &it8213_tune_chipset;
hwif->tuneproc = &it8213_tuneproc;
hwif->autodma = 0;
hwif->drives[0].autotune = 1;
hwif->drives[1].autotune = 1;
if (!hwif->dma_base)
return;
hwif->atapi_dma = 1;
hwif->ultra_mask = 0x7f;
hwif->mwdma_mask = 0x06;
hwif->swdma_mask = 0x04;
pci_read_config_byte(hwif->pci_dev, 0x42, &reg42h);
ata66 = (reg42h & 0x02) ? 0 : 1;
hwif->ide_dma_check = &it8213_config_drive_for_dma;
if (!(hwif->udma_four))
hwif->udma_four = ata66;
/*
* The BIOS often doesn't set up DMA on this controller
* so we always do it.
*/
if (!noautodma)
hwif->autodma = 1;
hwif->drives[0].autodma = hwif->autodma;
hwif->drives[1].autodma = hwif->autodma;
}
#define DECLARE_ITE_DEV(name_str) \
{ \
.name = name_str, \
.init_hwif = init_hwif_it8213, \
.channels = 1, \
.autodma = AUTODMA, \
.enablebits = {{0x41,0x80,0x80}}, \
.bootable = ON_BOARD, \
}
static ide_pci_device_t it8213_chipsets[] __devinitdata = {
/* 0 */ DECLARE_ITE_DEV("IT8213"),
};
/**
* it8213_init_one - pci layer discovery entry
* @dev: PCI device
* @id: ident table entry
*
* Called by the PCI code when it finds an ITE8213 controller. As
* this device follows the standard interfaces we can use the
* standard helper functions to do almost all the work for us.
*/
static int __devinit it8213_init_one(struct pci_dev *dev, const struct pci_device_id *id)
{
ide_setup_pci_device(dev, &it8213_chipsets[id->driver_data]);
return 0;
}
static struct pci_device_id it8213_pci_tbl[] = {
{ PCI_VENDOR_ID_ITE, 0x8213, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
{ 0, },
};
MODULE_DEVICE_TABLE(pci, it8213_pci_tbl);
static struct pci_driver driver = {
.name = "ITE8213_IDE",
.id_table = it8213_pci_tbl,
.probe = it8213_init_one,
};
static int __init it8213_ide_init(void)
{
return ide_pci_register_driver(&driver);
}
module_init(it8213_ide_init);
MODULE_AUTHOR("Jack Lee, Alan Cox");
MODULE_DESCRIPTION("PCI driver module for the ITE 8213");
MODULE_LICENSE("GPL");