247 lines
6.1 KiB
C
247 lines
6.1 KiB
C
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <linux/ide.h>
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#include <linux/bitops.h>
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static const char *udma_str[] =
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{ "UDMA/16", "UDMA/25", "UDMA/33", "UDMA/44",
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"UDMA/66", "UDMA/100", "UDMA/133", "UDMA7" };
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static const char *mwdma_str[] =
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{ "MWDMA0", "MWDMA1", "MWDMA2" };
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static const char *swdma_str[] =
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{ "SWDMA0", "SWDMA1", "SWDMA2" };
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static const char *pio_str[] =
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{ "PIO0", "PIO1", "PIO2", "PIO3", "PIO4", "PIO5" };
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/**
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* ide_xfer_verbose - return IDE mode names
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* @mode: transfer mode
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*
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* Returns a constant string giving the name of the mode
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* requested.
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*/
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const char *ide_xfer_verbose(u8 mode)
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{
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const char *s;
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u8 i = mode & 0xf;
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if (mode >= XFER_UDMA_0 && mode <= XFER_UDMA_7)
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s = udma_str[i];
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else if (mode >= XFER_MW_DMA_0 && mode <= XFER_MW_DMA_2)
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s = mwdma_str[i];
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else if (mode >= XFER_SW_DMA_0 && mode <= XFER_SW_DMA_2)
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s = swdma_str[i];
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else if (mode >= XFER_PIO_0 && mode <= XFER_PIO_5)
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s = pio_str[i & 0x7];
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else if (mode == XFER_PIO_SLOW)
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s = "PIO SLOW";
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else
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s = "XFER ERROR";
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return s;
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}
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EXPORT_SYMBOL(ide_xfer_verbose);
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/**
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* ide_get_best_pio_mode - get PIO mode from drive
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* @drive: drive to consider
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* @mode_wanted: preferred mode
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* @max_mode: highest allowed mode
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*
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* This routine returns the recommended PIO settings for a given drive,
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* based on the drive->id information and the ide_pio_blacklist[].
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*
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* Drive PIO mode is auto-selected if 255 is passed as mode_wanted.
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* This is used by most chipset support modules when "auto-tuning".
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*/
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u8 ide_get_best_pio_mode(ide_drive_t *drive, u8 mode_wanted, u8 max_mode)
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{
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u16 *id = drive->id;
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int pio_mode = -1, overridden = 0;
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if (mode_wanted != 255)
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return min_t(u8, mode_wanted, max_mode);
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if ((drive->hwif->host_flags & IDE_HFLAG_PIO_NO_BLACKLIST) == 0)
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pio_mode = ide_scan_pio_blacklist((char *)&id[ATA_ID_PROD]);
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if (pio_mode != -1) {
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printk(KERN_INFO "%s: is on PIO blacklist\n", drive->name);
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} else {
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pio_mode = id[ATA_ID_OLD_PIO_MODES] >> 8;
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if (pio_mode > 2) { /* 2 is maximum allowed tPIO value */
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pio_mode = 2;
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overridden = 1;
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}
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if (id[ATA_ID_FIELD_VALID] & 2) { /* ATA2? */
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if (ata_id_has_iordy(id)) {
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if (id[ATA_ID_PIO_MODES] & 7) {
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overridden = 0;
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if (id[ATA_ID_PIO_MODES] & 4)
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pio_mode = 5;
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else if (id[ATA_ID_PIO_MODES] & 2)
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pio_mode = 4;
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else
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pio_mode = 3;
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}
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}
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}
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if (overridden)
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printk(KERN_INFO "%s: tPIO > 2, assuming tPIO = 2\n",
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drive->name);
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}
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if (pio_mode > max_mode)
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pio_mode = max_mode;
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return pio_mode;
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}
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EXPORT_SYMBOL_GPL(ide_get_best_pio_mode);
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int ide_set_pio_mode(ide_drive_t *drive, const u8 mode)
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{
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ide_hwif_t *hwif = drive->hwif;
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const struct ide_port_ops *port_ops = hwif->port_ops;
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if (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)
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return 0;
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if (port_ops == NULL || port_ops->set_pio_mode == NULL)
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return -1;
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/*
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* TODO: temporary hack for some legacy host drivers that didn't
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* set transfer mode on the device in ->set_pio_mode method...
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*/
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if (port_ops->set_dma_mode == NULL) {
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port_ops->set_pio_mode(drive, mode - XFER_PIO_0);
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return 0;
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}
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if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) {
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if (ide_config_drive_speed(drive, mode))
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return -1;
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port_ops->set_pio_mode(drive, mode - XFER_PIO_0);
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return 0;
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} else {
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port_ops->set_pio_mode(drive, mode - XFER_PIO_0);
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return ide_config_drive_speed(drive, mode);
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}
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}
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int ide_set_dma_mode(ide_drive_t *drive, const u8 mode)
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{
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ide_hwif_t *hwif = drive->hwif;
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const struct ide_port_ops *port_ops = hwif->port_ops;
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if (hwif->host_flags & IDE_HFLAG_NO_SET_MODE)
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return 0;
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if (port_ops == NULL || port_ops->set_dma_mode == NULL)
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return -1;
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if (hwif->host_flags & IDE_HFLAG_POST_SET_MODE) {
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if (ide_config_drive_speed(drive, mode))
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return -1;
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port_ops->set_dma_mode(drive, mode);
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return 0;
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} else {
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port_ops->set_dma_mode(drive, mode);
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return ide_config_drive_speed(drive, mode);
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}
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}
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EXPORT_SYMBOL_GPL(ide_set_dma_mode);
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/* req_pio == "255" for auto-tune */
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void ide_set_pio(ide_drive_t *drive, u8 req_pio)
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{
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ide_hwif_t *hwif = drive->hwif;
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const struct ide_port_ops *port_ops = hwif->port_ops;
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u8 host_pio, pio;
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if (port_ops == NULL || port_ops->set_pio_mode == NULL ||
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(hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
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return;
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BUG_ON(hwif->pio_mask == 0x00);
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host_pio = fls(hwif->pio_mask) - 1;
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pio = ide_get_best_pio_mode(drive, req_pio, host_pio);
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/*
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* TODO:
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* - report device max PIO mode
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* - check req_pio != 255 against device max PIO mode
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*/
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printk(KERN_DEBUG "%s: host max PIO%d wanted PIO%d%s selected PIO%d\n",
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drive->name, host_pio, req_pio,
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req_pio == 255 ? "(auto-tune)" : "", pio);
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(void)ide_set_pio_mode(drive, XFER_PIO_0 + pio);
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}
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EXPORT_SYMBOL_GPL(ide_set_pio);
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/**
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* ide_rate_filter - filter transfer mode
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* @drive: IDE device
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* @speed: desired speed
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*
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* Given the available transfer modes this function returns
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* the best available speed at or below the speed requested.
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*
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* TODO: check device PIO capabilities
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*/
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static u8 ide_rate_filter(ide_drive_t *drive, u8 speed)
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{
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ide_hwif_t *hwif = drive->hwif;
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u8 mode = ide_find_dma_mode(drive, speed);
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if (mode == 0) {
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if (hwif->pio_mask)
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mode = fls(hwif->pio_mask) - 1 + XFER_PIO_0;
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else
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mode = XFER_PIO_4;
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}
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/* printk("%s: mode 0x%02x, speed 0x%02x\n", __func__, mode, speed); */
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return min(speed, mode);
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}
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/**
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* ide_set_xfer_rate - set transfer rate
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* @drive: drive to set
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* @rate: speed to attempt to set
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*
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* General helper for setting the speed of an IDE device. This
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* function knows about user enforced limits from the configuration
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* which ->set_pio_mode/->set_dma_mode does not.
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*/
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int ide_set_xfer_rate(ide_drive_t *drive, u8 rate)
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{
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ide_hwif_t *hwif = drive->hwif;
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const struct ide_port_ops *port_ops = hwif->port_ops;
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if (port_ops == NULL || port_ops->set_dma_mode == NULL ||
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(hwif->host_flags & IDE_HFLAG_NO_SET_MODE))
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return -1;
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rate = ide_rate_filter(drive, rate);
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BUG_ON(rate < XFER_PIO_0);
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if (rate >= XFER_PIO_0 && rate <= XFER_PIO_5)
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return ide_set_pio_mode(drive, rate);
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return ide_set_dma_mode(drive, rate);
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}
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