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[PATCH] pata_sil680 suspend/resume

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The SI680 can come back from s2ram with the clocks disabled (crash time)
or wrong (ugly as this can cause CRC errors, and in theory corruption).
On a resume we must put the clock back.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Alan 2006-11-22 17:28:41 +00:00 committed by Jeff Garzik
parent ad4a42d287
commit 8550c1637b
1 changed files with 55 additions and 27 deletions
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82
drivers/ata/pata_sil680.c
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@ -33,7 +33,7 @@
#include <linux/libata.h>
#define DRV_NAME "pata_sil680"
#define DRV_VERSION "0.3.2"
#define DRV_VERSION "0.4.1"
/**
* sil680_selreg - return register base
@ -263,32 +263,20 @@ static struct ata_port_operations sil680_port_ops = {
.host_stop = ata_host_stop
};
static int sil680_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
/**
* sil680_init_chip - chip setup
* @pdev: PCI device
*
* Perform all the chip setup which must be done both when the device
* is powered up on boot and when we resume in case we resumed from RAM.
* Returns the final clock settings.
*/
static u8 sil680_init_chip(struct pci_dev *pdev)
{
static struct ata_port_info info = {
.sht = &sil680_sht,
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
.pio_mask = 0x1f,
.mwdma_mask = 0x07,
.udma_mask = 0x7f,
.port_ops = &sil680_port_ops
};
static struct ata_port_info info_slow = {
.sht = &sil680_sht,
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
.pio_mask = 0x1f,
.mwdma_mask = 0x07,
.udma_mask = 0x3f,
.port_ops = &sil680_port_ops
};
static struct ata_port_info *port_info[2] = {&info, &info};
static int printed_version;
u32 class_rev = 0;
u8 tmpbyte = 0;
if (!printed_version++)
dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
pci_read_config_dword(pdev, PCI_CLASS_REVISION, &class_rev);
class_rev &= 0xff;
/* FIXME: double check */
@ -323,8 +311,6 @@ static int sil680_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
pci_read_config_byte(pdev, 0x8A, &tmpbyte);
printk(KERN_INFO "sil680: BA5_EN = %d clock = %02X\n",
tmpbyte & 1, tmpbyte & 0x30);
if ((tmpbyte & 0x30) == 0)
port_info[0] = port_info[1] = &info_slow;
pci_write_config_byte(pdev, 0xA1, 0x72);
pci_write_config_word(pdev, 0xA2, 0x328A);
@ -343,11 +329,51 @@ static int sil680_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
case 0x20: printk(KERN_INFO "sil680: Using PCI clock.\n");break;
/* This last case is _NOT_ ok */
case 0x30: printk(KERN_ERR "sil680: Clock disabled ?\n");
return -EIO;
}
return tmpbyte & 0x30;
}
static int sil680_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
{
static struct ata_port_info info = {
.sht = &sil680_sht,
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
.pio_mask = 0x1f,
.mwdma_mask = 0x07,
.udma_mask = 0x7f,
.port_ops = &sil680_port_ops
};
static struct ata_port_info info_slow = {
.sht = &sil680_sht,
.flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
.pio_mask = 0x1f,
.mwdma_mask = 0x07,
.udma_mask = 0x3f,
.port_ops = &sil680_port_ops
};
static struct ata_port_info *port_info[2] = {&info, &info};
static int printed_version;
if (!printed_version++)
dev_printk(KERN_DEBUG, &pdev->dev, "version " DRV_VERSION "\n");
switch(sil680_init_chip(pdev))
{
case 0:
port_info[0] = port_info[1] = &info_slow;
break;
case 0x30:
return -ENODEV;
}
return ata_pci_init_one(pdev, port_info, 2);
}
static int sil680_reinit_one(struct pci_dev *pdev)
{
sil680_init_chip(pdev);
return ata_pci_device_resume(pdev);
}
static const struct pci_device_id sil680[] = {
{ PCI_VDEVICE(CMD, PCI_DEVICE_ID_SII_680), },
@ -358,7 +384,9 @@ static struct pci_driver sil680_pci_driver = {
.name = DRV_NAME,
.id_table = sil680,
.probe = sil680_init_one,
.remove = ata_pci_remove_one
.remove = ata_pci_remove_one,
.suspend = ata_pci_device_suspend,
.resume = sil680_reinit_one,
};
static int __init sil680_init(void)