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remarkable-linux/drivers/ata/pata_it8213.c
Tejun Heo d4b2bab4f2 libata: add deadline support to prereset and reset methods 
Add @deadline to prereset and reset methods and make them honor it.
ata_wait_ready() which directly takes @deadline is implemented to be
used as the wait function.  This patch is in preparation for EH timing
improvements.

* ata_wait_ready() never does busy sleep.  It's only used from EH and
  no wait in EH is that urgent.  This function also prints 'be
  patient' message automatically after 5 secs of waiting if more than
  3 secs is remaining till deadline.

* ata_bus_post_reset() now fails with error code if any of its wait
  fails.  This is important because earlier reset tries will have
  shorter timeout than the spec requires.  If a device fails to
  respond before the short timeout, reset should be retried with
  longer timeout rather than silently ignoring the device.

  There are three behavior differences.

  1. Timeout is applied to both devices at once, not separately.  This
     is more consistent with what the spec says.

  2. When a device passes devchk but fails to become ready before
     deadline.  Previouly, post_reset would just succeed and let
     device classification remove the device.  New code fails the
     reset thus causing reset retry.  After a few times, EH will give
     up disabling the port.

  3. When slave device passes devchk but fails to become accessible
     (TF-wise) after reset.  Original code disables dev1 after 30s
     timeout and continues as if the device doesn't exist, while the
     patched code fails reset.  When this happens, new code fails
     reset on whole port rather than proceeding with only the primary
     device.

  If the failing device is suffering transient problems, new code
  retries reset which is a better behavior.  If the failing device is
  actually broken, the net effect is identical to it, but not to the
  other device sharing the channel.  In the previous code, reset would
  have succeeded after 30s thus detecting the working one.  In the new
  code, reset fails and whole port gets disabled.  IMO, it's a
  pathological case anyway (broken device sharing bus with working
  one) and doesn't really matter.

* ata_bus_softreset() is changed to return error code from
  ata_bus_post_reset().  It used to return 0 unconditionally.

* Spin up waiting is to be removed and not converted to honor
  deadline.

* To be on the safe side, deadline is set to 40s for the time being.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2007-05-01 07:49:53 -04:00

371 lines
9.7 KiB
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/*
* pata_it8213.c - iTE Tech. Inc. IT8213 PATA driver
*
* The IT8213 is a very Intel ICH like device for timing purposes, having
* a similar register layout and the same split clock arrangement. Cable
* detection is different, and it does not have slave channels or all the
* clutter of later ICH/SATA setups.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <scsi/scsi_host.h>
#include <linux/libata.h>
#include <linux/ata.h>
#define DRV_NAME "pata_it8213"
#define DRV_VERSION "0.0.2"
/**
* it8213_pre_reset - check for 40/80 pin
* @ap: Port
* @deadline: deadline jiffies for the operation
*
* Filter out ports by the enable bits before doing the normal reset
* and probe.
*/
static int it8213_pre_reset(struct ata_port *ap, unsigned long deadline)
{
static const struct pci_bits it8213_enable_bits[] = {
{ 0x41U, 1U, 0x80UL, 0x80UL }, /* port 0 */
};
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
if (!pci_test_config_bits(pdev, &it8213_enable_bits[ap->port_no]))
return -ENOENT;
return ata_std_prereset(ap, deadline);
}
/**
* it8213_error_handler - Probe specified port on PATA host controller
* @ap: Port to probe
*
* LOCKING:
* None (inherited from caller).
*/
static void it8213_error_handler(struct ata_port *ap)
{
ata_bmdma_drive_eh(ap, it8213_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
}
/**
* it8213_cable_detect - check for 40/80 pin
* @ap: Port
*
* Perform cable detection for the 8213 ATA interface. This is
* different to the PIIX arrangement
*/
static int it8213_cable_detect(struct ata_port *ap)
{
struct pci_dev *pdev = to_pci_dev(ap->host->dev);
u8 tmp;
pci_read_config_byte(pdev, 0x42, &tmp);
if (tmp & 2) /* The initial docs are incorrect */
return ATA_CBL_PATA40;
return ATA_CBL_PATA80;
}
/**
* it8213_set_piomode - Initialize host controller PATA PIO timings
* @ap: Port whose timings we are configuring
* @adev: Device whose timings we are configuring
*
* Set PIO mode for device, in host controller PCI config space.
*
* LOCKING:
* None (inherited from caller).
*/
static void it8213_set_piomode (struct ata_port *ap, struct ata_device *adev)
{
unsigned int pio = adev->pio_mode - XFER_PIO_0;
struct pci_dev *dev = to_pci_dev(ap->host->dev);
unsigned int idetm_port= ap->port_no ? 0x42 : 0x40;
u16 idetm_data;
int control = 0;
/*
* See Intel Document 298600-004 for the timing programing rules
* for PIIX/ICH. The 8213 is a clone so very similar
*/
static const /* ISP RTC */
u8 timings[][2] = { { 0, 0 },
{ 0, 0 },
{ 1, 0 },
{ 2, 1 },
{ 2, 3 }, };
if (pio > 2)
control |= 1; /* TIME1 enable */
if (ata_pio_need_iordy(adev)) /* PIO 3/4 require IORDY */
control |= 2; /* IORDY enable */
/* Bit 2 is set for ATAPI on the IT8213 - reverse of ICH/PIIX */
if (adev->class != ATA_DEV_ATA)
control |= 4;
pci_read_config_word(dev, idetm_port, &idetm_data);
/* Enable PPE, IE and TIME as appropriate */
if (adev->devno == 0) {
idetm_data &= 0xCCF0;
idetm_data |= control;
idetm_data |= (timings[pio][0] << 12) |
(timings[pio][1] << 8);
} else {
u8 slave_data;
idetm_data &= 0xCC0F;
idetm_data |= (control << 4);
/* Slave timing in seperate register */
pci_read_config_byte(dev, 0x44, &slave_data);
slave_data &= 0xF0;
slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << 4;
pci_write_config_byte(dev, 0x44, slave_data);
}
idetm_data |= 0x4000; /* Ensure SITRE is enabled */
pci_write_config_word(dev, idetm_port, idetm_data);
}
/**
* it8213_set_dmamode - Initialize host controller PATA DMA timings
* @ap: Port whose timings we are configuring
* @adev: Device to program
*
* Set UDMA/MWDMA mode for device, in host controller PCI config space.
* This device is basically an ICH alike.
*
* LOCKING:
* None (inherited from caller).
*/
static void it8213_set_dmamode (struct ata_port *ap, struct ata_device *adev)
{
struct pci_dev *dev = to_pci_dev(ap->host->dev);
u16 master_data;
u8 speed = adev->dma_mode;
int devid = adev->devno;
u8 udma_enable;
static const /* ISP RTC */
u8 timings[][2] = { { 0, 0 },
{ 0, 0 },
{ 1, 0 },
{ 2, 1 },
{ 2, 3 }, };
pci_read_config_word(dev, 0x40, &master_data);
pci_read_config_byte(dev, 0x48, &udma_enable);
if (speed >= XFER_UDMA_0) {
unsigned int udma = adev->dma_mode - XFER_UDMA_0;
u16 udma_timing;
u16 ideconf;
int u_clock, u_speed;
/* Clocks follow the PIIX style */
u_speed = min(2 - (udma & 1), udma);
if (udma == 5)
u_clock = 0x1000; /* 100Mhz */
else if (udma > 2)
u_clock = 1; /* 66Mhz */
else
u_clock = 0; /* 33Mhz */
udma_enable |= (1 << devid);
/* Load the UDMA mode number */
pci_read_config_word(dev, 0x4A, &udma_timing);
udma_timing &= ~(3 << (4 * devid));
udma_timing |= (udma & 3) << (4 * devid);
pci_write_config_word(dev, 0x4A, udma_timing);
/* Load the clock selection */
pci_read_config_word(dev, 0x54, &ideconf);
ideconf &= ~(0x1001 << devid);
ideconf |= u_clock << devid;
pci_write_config_word(dev, 0x54, ideconf);
} else {
/*
* MWDMA is driven by the PIO timings. We must also enable
* IORDY unconditionally along with TIME1. PPE has already
* been set when the PIO timing was set.
*/
unsigned int mwdma = adev->dma_mode - XFER_MW_DMA_0;
unsigned int control;
u8 slave_data;
static const unsigned int needed_pio[3] = {
XFER_PIO_0, XFER_PIO_3, XFER_PIO_4
};
int pio = needed_pio[mwdma] - XFER_PIO_0;
control = 3; /* IORDY|TIME1 */
/* If the drive MWDMA is faster than it can do PIO then
we must force PIO into PIO0 */
if (adev->pio_mode < needed_pio[mwdma])
/* Enable DMA timing only */
control |= 8; /* PIO cycles in PIO0 */
if (devid) { /* Slave */
master_data &= 0xFF4F; /* Mask out IORDY|TIME1|DMAONLY */
master_data |= control << 4;
pci_read_config_byte(dev, 0x44, &slave_data);
slave_data &= (0x0F + 0xE1 * ap->port_no);
/* Load the matching timing */
slave_data |= ((timings[pio][0] << 2) | timings[pio][1]) << (ap->port_no ? 4 : 0);
pci_write_config_byte(dev, 0x44, slave_data);
} else { /* Master */
master_data &= 0xCCF4; /* Mask out IORDY|TIME1|DMAONLY
and master timing bits */
master_data |= control;
master_data |=
(timings[pio][0] << 12) |
(timings[pio][1] << 8);
}
udma_enable &= ~(1 << devid);
pci_write_config_word(dev, 0x40, master_data);
}
pci_write_config_byte(dev, 0x48, udma_enable);
}
static struct scsi_host_template it8213_sht = {
.module = THIS_MODULE,
.name = DRV_NAME,
.ioctl = ata_scsi_ioctl,
.queuecommand = ata_scsi_queuecmd,
.can_queue = ATA_DEF_QUEUE,
.this_id = ATA_SHT_THIS_ID,
.sg_tablesize = LIBATA_MAX_PRD,
.max_sectors = ATA_MAX_SECTORS,
.cmd_per_lun = ATA_SHT_CMD_PER_LUN,
.emulated = ATA_SHT_EMULATED,
.use_clustering = ATA_SHT_USE_CLUSTERING,
.proc_name = DRV_NAME,
.dma_boundary = ATA_DMA_BOUNDARY,
.slave_configure = ata_scsi_slave_config,
.bios_param = ata_std_bios_param,
#ifdef CONFIG_PM
.resume = ata_scsi_device_resume,
.suspend = ata_scsi_device_suspend,
#endif
};
static const struct ata_port_operations it8213_ops = {
.port_disable = ata_port_disable,
.set_piomode = it8213_set_piomode,
.set_dmamode = it8213_set_dmamode,
.mode_filter = ata_pci_default_filter,
.tf_load = ata_tf_load,
.tf_read = ata_tf_read,
.check_status = ata_check_status,
.exec_command = ata_exec_command,
.dev_select = ata_std_dev_select,
.freeze = ata_bmdma_freeze,
.thaw = ata_bmdma_thaw,
.error_handler = it8213_error_handler,
.post_internal_cmd = ata_bmdma_post_internal_cmd,
.cable_detect = it8213_cable_detect,
.bmdma_setup = ata_bmdma_setup,
.bmdma_start = ata_bmdma_start,
.bmdma_stop = ata_bmdma_stop,
.bmdma_status = ata_bmdma_status,
.qc_prep = ata_qc_prep,
.qc_issue = ata_qc_issue_prot,
.data_xfer = ata_data_xfer,
.irq_handler = ata_interrupt,
.irq_clear = ata_bmdma_irq_clear,
.irq_on = ata_irq_on,
.irq_ack = ata_irq_ack,
.port_start = ata_port_start,
};
/**
* it8213_init_one - Register 8213 ATA PCI device with kernel services
* @pdev: PCI device to register
* @ent: Entry in it8213_pci_tbl matching with @pdev
*
* Called from kernel PCI layer.
*
* LOCKING:
* Inherited from PCI layer (may sleep).
*
* RETURNS:
* Zero on success, or -ERRNO value.
*/
static int it8213_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
{
static int printed_version;
static struct ata_port_info info = {
.sht = &it8213_sht,
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
.pio_mask = 0x1f, /* pio0-4 */
.mwdma_mask = 0x07, /* mwdma0-2 */
.udma_mask = 0x1f, /* UDMA 100 */
.port_ops = &it8213_ops,
};
static struct ata_port_info *port_info[2] = { &info, &info };
if (!printed_version++)
dev_printk(KERN_DEBUG, &pdev->dev,
"version " DRV_VERSION "\n");
/* Current IT8213 stuff is single port */
return ata_pci_init_one(pdev, port_info, 1);
}
static const struct pci_device_id it8213_pci_tbl[] = {
{ PCI_VDEVICE(ITE, PCI_DEVICE_ID_ITE_8213), },
{ } /* terminate list */
};
static struct pci_driver it8213_pci_driver = {
.name = DRV_NAME,
.id_table = it8213_pci_tbl,
.probe = it8213_init_one,
.remove = ata_pci_remove_one,
#ifdef CONFIG_PM
.suspend = ata_pci_device_suspend,
.resume = ata_pci_device_resume,
#endif
};
static int __init it8213_init(void)
{
return pci_register_driver(&it8213_pci_driver);
}
static void __exit it8213_exit(void)
{
pci_unregister_driver(&it8213_pci_driver);
}
module_init(it8213_init);
module_exit(it8213_exit);
MODULE_AUTHOR("Alan Cox");
MODULE_DESCRIPTION("SCSI low-level driver for the ITE 8213");
MODULE_LICENSE("GPL");
MODULE_DEVICE_TABLE(pci, it8213_pci_tbl);
MODULE_VERSION(DRV_VERSION);
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