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authorTejun Heo <htejun@gmail.com>2008-03-25 06:22:50 +0300
committerJeff Garzik <jgarzik@redhat.com>2008-04-17 23:44:18 +0400
commita1efdaba2dbd6fb89e23a87b66d3f4dd92c9f5af (patch)
tree6197c537892e0d887b2a90e369b74abf0500b9ac /drivers/ata/pata_hpt37x.c
parent959471936241bd83da7d0a76411cef6772140fe6 (diff)
downloadlinux-a1efdaba2dbd6fb89e23a87b66d3f4dd92c9f5af.tar.xz
libata: make reset related methods proper port operations
Currently reset methods are not specified directly in the ata_port_operations table. If a LLD wants to use custom reset methods, it should construct and use a error_handler which uses those reset methods. It's done this way for two reasons. First, the ops table already contained too many methods and adding four more of them would noticeably increase the amount of necessary boilerplate code all over low level drivers. Second, as ->error_handler uses those reset methods, it can get confusing. ie. By overriding ->error_handler, those reset ops can be made useless making layering a bit hazy. Now that ops table uses inheritance, the first problem doesn't exist anymore. The second isn't completely solved but is relieved by providing default values - most drivers can just override what it has implemented and don't have to concern itself about higher level callbacks. In fact, there currently is no driver which actually modifies error handling behavior. Drivers which override ->error_handler just wraps the standard error handler only to prepare the controller for EH. I don't think making ops layering strict has any noticeable benefit. This patch makes ->prereset, ->softreset, ->hardreset, ->postreset and their PMP counterparts propoer ops. Default ops are provided in the base ops tables and drivers are converted to override individual reset methods instead of creating custom error_handler. * ata_std_error_handler() doesn't use sata_std_hardreset() if SCRs aren't accessible. sata_promise doesn't need to use separate error_handlers for PATA and SATA anymore. * softreset is broken for sata_inic162x and sata_sx4. As libata now always prefers hardreset, this doesn't really matter but the ops are forced to NULL using ATA_OP_NULL for documentation purpose. * pata_hpt374 needs to use different prereset for the first and second PCI functions. This used to be done by branching from hpt374_error_handler(). The proper way to do this is to use separate ops and port_info tables for each function. Converted. Signed-off-by: Tejun Heo <htejun@gmail.com>
Diffstat (limited to 'drivers/ata/pata_hpt37x.c')
-rw-r--r--drivers/ata/pata_hpt37x.c61
1 files changed, 20 insertions, 41 deletions
diff --git a/drivers/ata/pata_hpt37x.c b/drivers/ata/pata_hpt37x.c
index fb37e3a161fc..c10fcd31418d 100644
--- a/drivers/ata/pata_hpt37x.c
+++ b/drivers/ata/pata_hpt37x.c
@@ -341,19 +341,7 @@ static int hpt37x_pre_reset(struct ata_link *link, unsigned long deadline)
return ata_std_prereset(link, deadline);
}
-/**
- * hpt37x_error_handler - reset the hpt374
- * @ap: ATA port to reset
- *
- * Perform probe for HPT37x, except for HPT374 channel 2
- */
-
-static void hpt37x_error_handler(struct ata_port *ap)
-{
- ata_bmdma_drive_eh(ap, hpt37x_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
-}
-
-static int hpt374_pre_reset(struct ata_link *link, unsigned long deadline)
+static int hpt374_fn1_pre_reset(struct ata_link *link, unsigned long deadline)
{
static const struct pci_bits hpt37x_enable_bits[] = {
{ 0x50, 1, 0x04, 0x04 },
@@ -390,25 +378,6 @@ static int hpt374_pre_reset(struct ata_link *link, unsigned long deadline)
}
/**
- * hpt374_error_handler - reset the hpt374
- * @classes:
- *
- * The 374 cable detect is a little different due to the extra
- * channels. The function 0 channels work like usual but function 1
- * is special
- */
-
-static void hpt374_error_handler(struct ata_port *ap)
-{
- struct pci_dev *pdev = to_pci_dev(ap->host->dev);
-
- if (!(PCI_FUNC(pdev->devfn) & 1))
- hpt37x_error_handler(ap);
- else
- ata_bmdma_drive_eh(ap, hpt374_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
-}
-
-/**
* hpt370_set_piomode - PIO setup
* @ap: ATA interface
* @adev: device on the interface
@@ -635,7 +604,7 @@ static struct ata_port_operations hpt370_port_ops = {
.mode_filter = hpt370_filter,
.set_piomode = hpt370_set_piomode,
.set_dmamode = hpt370_set_dmamode,
- .error_handler = hpt37x_error_handler,
+ .prereset = hpt37x_pre_reset,
};
/*
@@ -659,17 +628,17 @@ static struct ata_port_operations hpt372_port_ops = {
.set_piomode = hpt372_set_piomode,
.set_dmamode = hpt372_set_dmamode,
- .error_handler = hpt37x_error_handler,
+ .prereset = hpt37x_pre_reset,
};
/*
* Configuration for HPT374. Mode setting works like 372 and friends
- * but we have a different cable detection procedure.
+ * but we have a different cable detection procedure for function 1.
*/
-static struct ata_port_operations hpt374_port_ops = {
+static struct ata_port_operations hpt374_fn1_port_ops = {
.inherits = &hpt372_port_ops,
- .error_handler = hpt374_error_handler,
+ .prereset = hpt374_fn1_pre_reset,
};
/**
@@ -821,13 +790,20 @@ static int hpt37x_init_one(struct pci_dev *dev, const struct pci_device_id *id)
.udma_mask = ATA_UDMA6,
.port_ops = &hpt372_port_ops
};
- /* HPT374 - UDMA100 */
- static const struct ata_port_info info_hpt374 = {
+ /* HPT374 - UDMA100, function 1 uses different prereset method */
+ static const struct ata_port_info info_hpt374_fn0 = {
+ .flags = ATA_FLAG_SLAVE_POSS,
+ .pio_mask = 0x1f,
+ .mwdma_mask = 0x07,
+ .udma_mask = ATA_UDMA5,
+ .port_ops = &hpt372_port_ops
+ };
+ static const struct ata_port_info info_hpt374_fn1 = {
.flags = ATA_FLAG_SLAVE_POSS,
.pio_mask = 0x1f,
.mwdma_mask = 0x07,
.udma_mask = ATA_UDMA5,
- .port_ops = &hpt374_port_ops
+ .port_ops = &hpt374_fn1_port_ops
};
static const int MHz[4] = { 33, 40, 50, 66 };
@@ -912,7 +888,10 @@ static int hpt37x_init_one(struct pci_dev *dev, const struct pci_device_id *id)
break;
case PCI_DEVICE_ID_TTI_HPT374:
chip_table = &hpt374;
- ppi[0] = &info_hpt374;
+ if (!(PCI_FUNC(dev->devfn) & 1))
+ *ppi = &info_hpt374_fn0;
+ else
+ *ppi = &info_hpt374_fn1;
break;
default:
printk(KERN_ERR "pata_hpt37x: PCI table is bogus please report (%d).\n", dev->device);