268 lines
6.7 KiB
C
268 lines
6.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
#include <linux/types.h>
|
|
#include <linux/string.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/export.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/ide.h>
|
|
#include <linux/bitops.h>
|
|
|
|
static const char *udma_str[] =
|
|
{ "UDMA/16", "UDMA/25", "UDMA/33", "UDMA/44",
|
|
"UDMA/66", "UDMA/100", "UDMA/133", "UDMA7" };
|
|
static const char *mwdma_str[] =
|
|
{ "MWDMA0", "MWDMA1", "MWDMA2", "MWDMA3", "MWDMA4" };
|
|
static const char *swdma_str[] =
|
|
{ "SWDMA0", "SWDMA1", "SWDMA2" };
|
|
static const char *pio_str[] =
|
|
{ "PIO0", "PIO1", "PIO2", "PIO3", "PIO4", "PIO5", "PIO6" };
|
|
|
|
/**
|
|
* ide_xfer_verbose - return IDE mode names
|
|
* @mode: transfer mode
|
|
*
|
|
* Returns a constant string giving the name of the mode
|
|
* requested.
|
|
*/
|
|
|
|
const char *ide_xfer_verbose(u8 mode)
|
|
{
|
|
const char *s;
|
|
u8 i = mode & 0xf;
|
|
|
|
if (mode >= XFER_UDMA_0 && mode <= XFER_UDMA_7)
|
|
s = udma_str[i];
|
|
else if (mode >= XFER_MW_DMA_0 && mode <= XFER_MW_DMA_4)
|
|
s = mwdma_str[i];
|
|
else if (mode >= XFER_SW_DMA_0 && mode <= XFER_SW_DMA_2)
|
|
s = swdma_str[i];
|
|
else if (mode >= XFER_PIO_0 && mode <= XFER_PIO_6)
|
|
s = pio_str[i & 0x7];
|
|
else if (mode == XFER_PIO_SLOW)
|
|
s = "PIO SLOW";
|
|
else
|
|
s = "XFER ERROR";
|
|
|
|
return s;
|
|
}
|
|
EXPORT_SYMBOL(ide_xfer_verbose);
|
|
|
|
/**
|
|
* ide_get_best_pio_mode - get PIO mode from drive
|
|
* @drive: drive to consider
|
|
* @mode_wanted: preferred mode
|
|
* @max_mode: highest allowed mode
|
|
*
|
|
* This routine returns the recommended PIO settings for a given drive,
|
|
* based on the drive->id information and the ide_pio_blacklist[].
|
|
*
|
|
* Drive PIO mode is auto-selected if 255 is passed as mode_wanted.
|
|
* This is used by most chipset support modules when "auto-tuning".
|
|
*/
|
|
|
|
static u8 ide_get_best_pio_mode(ide_drive_t *drive, u8 mode_wanted, u8 max_mode)
|
|
{
|
|
u16 *id = drive->id;
|
|
int pio_mode = -1, overridden = 0;
|
|
|
|
if (mode_wanted != 255)
|
|
return min_t(u8, mode_wanted, max_mode);
|
|
|
|
if ((drive->hwif->host_flags & IDE_HFLAG_PIO_NO_BLACKLIST) == 0)
|
|
pio_mode = ide_scan_pio_blacklist((char *)&id[ATA_ID_PROD]);
|
|
|
|
if (pio_mode != -1) {
|
|
printk(KERN_INFO "%s: is on PIO blacklist\n", drive->name);
|
|
} else {
|
|
pio_mode = id[ATA_ID_OLD_PIO_MODES] >> 8;
|
|
if (pio_mode > 2) { /* 2 is maximum allowed tPIO value */
|
|
pio_mode = 2;
|
|
overridden = 1;
|
|
}
|
|
|
|
if (id[ATA_ID_FIELD_VALID] & 2) { /* ATA2? */
|
|
if (ata_id_is_cfa(id) && (id[ATA_ID_CFA_MODES] & 7))
|
|
pio_mode = 4 + min_t(int, 2,
|
|
id[ATA_ID_CFA_MODES] & 7);
|
|
else if (ata_id_has_iordy(id)) {
|
|
if (id[ATA_ID_PIO_MODES] & 7) {
|
|
overridden = 0;
|
|
if (id[ATA_ID_PIO_MODES] & 4)
|
|
pio_mode = 5;
|
|
else if (id[ATA_ID_PIO_MODES] & 2)
|
|
pio_mode = 4;
|
|
else
|
|
pio_mode = 3;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (overridden)
|
|
printk(KERN_INFO "%s: tPIO > 2, assuming tPIO = 2\n",
|
|
drive->name);
|
|
}
|
|
|
|
if (pio_mode > max_mode)
|
|
pio_mode = max_mode;
|
|
|
|
return pio_mode;
|
|
}
|
|
|
|
int ide_pio_need_iordy(ide_drive_t *drive, const u8 pio)
|
|
{
|
|
/*
|
|
* IORDY may lead to controller lock up on certain controllers
|
|
* if the port is not occupied.
|
|
*/
|
|
if (pio == 0 && (drive->hwif->port_flags & IDE_PFLAG_PROBING))
|
|
return 0;
|
|
return ata_id_pio_need_iordy(drive->id, pio);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ide_pio_need_iordy);
|
|
|
|
int ide_set_pio_mode(ide_drive_t *drive, const u8 mode)
|
|
{
|
|
ide_hwif_t *hwif = drive->hwif;
|
|
const struct ide_port_ops *port_ops = hwif->port_ops;
|
|
|
|
if (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)
|
|
return 0;
|
|
|
|
if (port_ops == NULL || port_ops->set_pio_mode == NULL)
|
|
return -1;
|
|
|
|
/*
|
|
* TODO: temporary hack for some legacy host drivers that didn't
|
|
* set transfer mode on the device in ->set_pio_mode method...
|
|
*/
|
|
if (port_ops->set_dma_mode == NULL) {
|
|
drive->pio_mode = mode;
|
|
port_ops->set_pio_mode(hwif, drive);
|
|
return 0;
|
|
}
|
|
|
|
if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) {
|
|
if (ide_config_drive_speed(drive, mode))
|
|
return -1;
|
|
drive->pio_mode = mode;
|
|
port_ops->set_pio_mode(hwif, drive);
|
|
return 0;
|
|
} else {
|
|
drive->pio_mode = mode;
|
|
port_ops->set_pio_mode(hwif, drive);
|
|
return ide_config_drive_speed(drive, mode);
|
|
}
|
|
}
|
|
|
|
int ide_set_dma_mode(ide_drive_t *drive, const u8 mode)
|
|
{
|
|
ide_hwif_t *hwif = drive->hwif;
|
|
const struct ide_port_ops *port_ops = hwif->port_ops;
|
|
|
|
if (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)
|
|
return 0;
|
|
|
|
if (port_ops == NULL || port_ops->set_dma_mode == NULL)
|
|
return -1;
|
|
|
|
if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) {
|
|
if (ide_config_drive_speed(drive, mode))
|
|
return -1;
|
|
drive->dma_mode = mode;
|
|
port_ops->set_dma_mode(hwif, drive);
|
|
return 0;
|
|
} else {
|
|
drive->dma_mode = mode;
|
|
port_ops->set_dma_mode(hwif, drive);
|
|
return ide_config_drive_speed(drive, mode);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(ide_set_dma_mode);
|
|
|
|
/* req_pio == "255" for auto-tune */
|
|
void ide_set_pio(ide_drive_t *drive, u8 req_pio)
|
|
{
|
|
ide_hwif_t *hwif = drive->hwif;
|
|
const struct ide_port_ops *port_ops = hwif->port_ops;
|
|
u8 host_pio, pio;
|
|
|
|
if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
|
|
(hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
|
|
return;
|
|
|
|
BUG_ON(hwif->pio_mask == 0x00);
|
|
|
|
host_pio = fls(hwif->pio_mask) - 1;
|
|
|
|
pio = ide_get_best_pio_mode(drive, req_pio, host_pio);
|
|
|
|
/*
|
|
* TODO:
|
|
* - report device max PIO mode
|
|
* - check req_pio != 255 against device max PIO mode
|
|
*/
|
|
printk(KERN_DEBUG "%s: host max PIO%d wanted PIO%d%s selected PIO%d\n",
|
|
drive->name, host_pio, req_pio,
|
|
req_pio == 255 ? "(auto-tune)" : "", pio);
|
|
|
|
(void)ide_set_pio_mode(drive, XFER_PIO_0 + pio);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ide_set_pio);
|
|
|
|
/**
|
|
* ide_rate_filter - filter transfer mode
|
|
* @drive: IDE device
|
|
* @speed: desired speed
|
|
*
|
|
* Given the available transfer modes this function returns
|
|
* the best available speed at or below the speed requested.
|
|
*
|
|
* TODO: check device PIO capabilities
|
|
*/
|
|
|
|
static u8 ide_rate_filter(ide_drive_t *drive, u8 speed)
|
|
{
|
|
ide_hwif_t *hwif = drive->hwif;
|
|
u8 mode = ide_find_dma_mode(drive, speed);
|
|
|
|
if (mode == 0) {
|
|
if (hwif->pio_mask)
|
|
mode = fls(hwif->pio_mask) - 1 + XFER_PIO_0;
|
|
else
|
|
mode = XFER_PIO_4;
|
|
}
|
|
|
|
/* printk("%s: mode 0x%02x, speed 0x%02x\n", __func__, mode, speed); */
|
|
|
|
return min(speed, mode);
|
|
}
|
|
|
|
/**
|
|
* ide_set_xfer_rate - set transfer rate
|
|
* @drive: drive to set
|
|
* @rate: speed to attempt to set
|
|
*
|
|
* General helper for setting the speed of an IDE device. This
|
|
* function knows about user enforced limits from the configuration
|
|
* which ->set_pio_mode/->set_dma_mode does not.
|
|
*/
|
|
|
|
int ide_set_xfer_rate(ide_drive_t *drive, u8 rate)
|
|
{
|
|
ide_hwif_t *hwif = drive->hwif;
|
|
const struct ide_port_ops *port_ops = hwif->port_ops;
|
|
|
|
if (port_ops == NULL || port_ops->set_dma_mode == NULL ||
|
|
(hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
|
|
return -1;
|
|
|
|
rate = ide_rate_filter(drive, rate);
|
|
|
|
BUG_ON(rate < XFER_PIO_0);
|
|
|
|
if (rate >= XFER_PIO_0 && rate <= XFER_PIO_6)
|
|
return ide_set_pio_mode(drive, rate);
|
|
|
|
return ide_set_dma_mode(drive, rate);
|
|
}
|