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>

1 files changed, 8 insertions, 108 deletions

diff --git a/drivers/ata/pata_cmd64x.c b/drivers/ata/pata_cmd64x.c
index dadfc358ba1c..58c09e223838 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