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authorJeff Garzik <jeff@garzik.org>2009-12-20 15:39:55 -0500
committerJeff Garzik <jgarzik@redhat.com>2009-12-20 15:39:55 -0500
commit06393afde321b0fd7626b2d0966ebcaf6077de93 (patch)
treecc70a89371e43723b6ddfb41a3639da114ae4b4c /drivers
parentdd59f6c76b265ed2ff18b497d6105a9511b1feb1 (diff)
downloadop-kernel-dev-06393afde321b0fd7626b2d0966ebcaf6077de93.zip
op-kernel-dev-06393afde321b0fd7626b2d0966ebcaf6077de93.tar.gz
Revert "pata_cmd64x: implement serialization as per notes"
This reverts commit d43744390e460dce6626fb8de2c02a24ff650005, because it breaks the boot on several machines (mostly sparc64, at present). Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/ata/pata_cmd64x.c116
1 files changed, 8 insertions, 108 deletions
diff --git a/drivers/ata/pata_cmd64x.c b/drivers/ata/pata_cmd64x.c
index dadfc35..58c09e22 100644
--- a/drivers/ata/pata_cmd64x.c
+++ b/drivers/ata/pata_cmd64x.c
@@ -31,7 +31,7 @@
#include <linux/libata.h>
#define DRV_NAME "pata_cmd64x"
-#define DRV_VERSION "0.3.1"
+#define DRV_VERSION "0.2.5"
/*
* CMD64x specific registers definition.
@@ -254,109 +254,17 @@ static void cmd648_bmdma_stop(struct ata_queued_cmd *qc)
}
/**
- * cmd64x_bmdma_stop - DMA stop callback
+ * cmd646r1_dma_stop - DMA stop callback
* @qc: Command in progress
*
- * Track the completion of live DMA commands and clear the
- * host->private_data DMA tracking flag as we do.
+ * Stub for now while investigating the r1 quirk in the old driver.
*/
-static void cmd64x_bmdma_stop(struct ata_queued_cmd *qc)
+static void cmd646r1_bmdma_stop(struct ata_queued_cmd *qc)
{
- struct ata_port *ap = qc->ap;
ata_bmdma_stop(qc);
- WARN_ON(ap->host->private_data != ap);
- ap->host->private_data = NULL;
-}
-
-/**
- * cmd64x_qc_defer - Defer logic for chip limits
- * @qc: queued command
- *
- * Decide whether we can issue the command. Called under the host lock.
- */
-
-static int cmd64x_qc_defer(struct ata_queued_cmd *qc)
-{
- struct ata_host *host = qc->ap->host;
- struct ata_port *alt = host->ports[1 ^ qc->ap->port_no];
- int rc;
- int dma = 0;
-
- /* Apply the ATA rules first */
- rc = ata_std_qc_defer(qc);
- if (rc)
- return rc;
-
- if (qc->tf.protocol == ATAPI_PROT_DMA ||
- qc->tf.protocol == ATA_PROT_DMA)
- dma = 1;
-
- /* If the other port is not live then issue the command */
- if (alt == NULL || !alt->qc_active) {
- if (dma)
- host->private_data = qc->ap;
- return 0;
- }
- /* If there is a live DMA command then wait */
- if (host->private_data != NULL)
- return ATA_DEFER_PORT;
- if (dma)
- /* Cannot overlap our DMA command */
- return ATA_DEFER_PORT;
- return 0;
}
-/**
- * cmd64x_interrupt - ATA host interrupt handler
- * @irq: irq line (unused)
- * @dev_instance: pointer to our ata_host information structure
- *
- * Our interrupt handler for PCI IDE devices. Calls
- * ata_sff_host_intr() for each port that is flagging an IRQ. We cannot
- * use the defaults as we need to avoid touching status/altstatus during
- * a DMA.
- *
- * LOCKING:
- * Obtains host lock during operation.
- *
- * RETURNS:
- * IRQ_NONE or IRQ_HANDLED.
- */
-irqreturn_t cmd64x_interrupt(int irq, void *dev_instance)
-{
- struct ata_host *host = dev_instance;
- struct pci_dev *pdev = to_pci_dev(host->dev);
- unsigned int i;
- unsigned int handled = 0;
- unsigned long flags;
- static const u8 irq_reg[2] = { CFR, ARTTIM23 };
- static const u8 irq_mask[2] = { 1 << 2, 1 << 4 };
-
- /* TODO: make _irqsave conditional on x86 PCI IDE legacy mode */
- spin_lock_irqsave(&host->lock, flags);
-
- for (i = 0; i < host->n_ports; i++) {
- struct ata_port *ap;
- u8 reg;
-
- pci_read_config_byte(pdev, irq_reg[i], &reg);
- ap = host->ports[i];
- if (ap && (reg & irq_mask[i]) &&
- !(ap->flags & ATA_FLAG_DISABLED)) {
- struct ata_queued_cmd *qc;
-
- qc = ata_qc_from_tag(ap, ap->link.active_tag);
- if (qc && (!(qc->tf.flags & ATA_TFLAG_POLLING)) &&
- (qc->flags & ATA_QCFLAG_ACTIVE))
- handled |= ata_sff_host_intr(ap, qc);
- }
- }
-
- spin_unlock_irqrestore(&host->lock, flags);
-
- return IRQ_RETVAL(handled);
-}
static struct scsi_host_template cmd64x_sht = {
ATA_BMDMA_SHT(DRV_NAME),
};
@@ -365,8 +273,6 @@ static const struct ata_port_operations cmd64x_base_ops = {
.inherits = &ata_bmdma_port_ops,
.set_piomode = cmd64x_set_piomode,
.set_dmamode = cmd64x_set_dmamode,
- .bmdma_stop = cmd64x_bmdma_stop,
- .qc_defer = cmd64x_qc_defer,
};
static struct ata_port_operations cmd64x_port_ops = {
@@ -376,6 +282,7 @@ static struct ata_port_operations cmd64x_port_ops = {
static struct ata_port_operations cmd646r1_port_ops = {
.inherits = &cmd64x_base_ops,
+ .bmdma_stop = cmd646r1_bmdma_stop,
.cable_detect = ata_cable_40wire,
};
@@ -383,7 +290,6 @@ static struct ata_port_operations cmd648_port_ops = {
.inherits = &cmd64x_base_ops,
.bmdma_stop = cmd648_bmdma_stop,
.cable_detect = cmd648_cable_detect,
- .qc_defer = ata_std_qc_defer
};
static int cmd64x_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
@@ -432,7 +338,6 @@ static int cmd64x_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
const struct ata_port_info *ppi[] = { &cmd_info[id->driver_data], NULL };
u8 mrdmode;
int rc;
- struct ata_host *host;
rc = pcim_enable_device(pdev);
if (rc)
@@ -450,25 +355,20 @@ static int cmd64x_init_one(struct pci_dev *pdev, const struct pci_device_id *id)
ppi[0] = &cmd_info[3];
}
-
pci_write_config_byte(pdev, PCI_LATENCY_TIMER, 64);
pci_read_config_byte(pdev, MRDMODE, &mrdmode);
mrdmode &= ~ 0x30; /* IRQ set up */
mrdmode |= 0x02; /* Memory read line enable */
pci_write_config_byte(pdev, MRDMODE, mrdmode);
+ /* Force PIO 0 here.. */
+
/* PPC specific fixup copied from old driver */
#ifdef CONFIG_PPC
pci_write_config_byte(pdev, UDIDETCR0, 0xF0);
#endif
- rc = ata_pci_sff_prepare_host(pdev, ppi, &host);
- if (rc)
- return rc;
- /* We use this pointer to track the AP which has DMA running */
- host->private_data = NULL;
- pci_set_master(pdev);
- return ata_pci_sff_activate_host(host, cmd64x_interrupt, &cmd64x_sht);
+ return ata_pci_sff_init_one(pdev, ppi, &cmd64x_sht, NULL);
}
#ifdef CONFIG_PM
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