[libata] Add a bunch of PATA drivers.

The vast majority of drivers and changes are from Alan Cox.  Albert Lee
contributed and maintains pata_pdc2027x.  Adrian Bunk, Andrew Morton,
and Tejun Heo contributed various minor fixes and updates.

Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 388 insertions, 0 deletions

diff --git a/drivers/ata/pata_sl82c105.c b/drivers/ata/pata_sl82c105.c
new file mode 100644
index 000000000000..47b290b5604a
--- /dev/null
+++ b/drivers/ata/pata_sl82c105.c
@@ -0,0 +1,388 @@
+/*
+ * pata_sl82c105.c      - SL82C105 PATA for new ATA layer
+ *                        (C) 2005 Red Hat Inc
+ *                        Alan Cox <alan@redhat.com>
+ *
+ * Based in part on linux/drivers/ide/pci/sl82c105.c
+ *              SL82C105/Winbond 553 IDE driver
+ *
+ * and in part on the documentation and errata sheet
+ */
+ 
+#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 <scsi/scsi_host.h>
+#include <linux/libata.h>
+
+#define DRV_NAME "pata_sl82c105"
+#define DRV_VERSION "0.2.2"
+
+enum {
+        /*
+         * SL82C105 PCI config register 0x40 bits.
+         */
+        CTRL_IDE_IRQB   =       (1 << 30),
+        CTRL_IDE_IRQA   =       (1 << 28),
+        CTRL_LEGIRQ     =       (1 << 11),
+        CTRL_P1F16      =       (1 << 5),
+        CTRL_P1EN       =       (1 << 4),
+        CTRL_P0F16      =       (1 << 1),
+        CTRL_P0EN       =       (1 << 0)
+};
+
+/**
+ *      sl82c105_pre_reset              -       probe begin
+ *      @ap: ATA port
+ *
+ *      Set up cable type and use generic probe init
+ */
+ 
+static int sl82c105_pre_reset(struct ata_port *ap)
+{
+        static const struct pci_bits sl82c105_enable_bits[] = {
+                { 0x40, 1, 0x01, 0x01 },
+                { 0x40, 1, 0x10, 0x10 }
+        };
+        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+
+        if (ap->port_no && !pci_test_config_bits(pdev, &sl82c105_enable_bits[ap->port_no])) {
+                ata_port_disable(ap);
+                dev_printk(KERN_INFO, &pdev->dev, "port disabled. ignoring.\n");
+                return 0;
+        }
+        ap->cbl = ATA_CBL_PATA40;
+        return ata_std_prereset(ap);
+}
+
+
+static void sl82c105_error_handler(struct ata_port *ap)
+{
+        ata_bmdma_drive_eh(ap, sl82c105_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
+}
+
+
+/**
+ *      sl82c105_configure_piomode      -       set chip PIO timing
+ *      @ap: ATA interface
+ *      @adev: ATA device
+ *      @pio: PIO mode
+ *
+ *      Called to do the PIO mode setup. Our timing registers are shared
+ *      so a configure_dmamode call will undo any work we do here and vice
+ *      versa
+ */
+ 
+static void sl82c105_configure_piomode(struct ata_port *ap, struct ata_device *adev, int pio)
+{
+        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+        static u16 pio_timing[5] = {
+                0x50D, 0x407, 0x304, 0x242, 0x240
+        };
+        u16 dummy;
+        int timing = 0x44 + (8 * ap->port_no) + (4 * adev->devno);
+        
+        pci_write_config_word(pdev, timing, pio_timing[pio]);
+        /* Can we lose this oddity of the old driver */
+        pci_read_config_word(pdev, timing, &dummy);
+}
+
+/**
+ *      sl82c105_set_piomode    -       set initial PIO mode data
+ *      @ap: ATA interface
+ *      @adev: ATA device
+ *
+ *      Called to do the PIO mode setup. Our timing registers are shared
+ *      but we want to set the PIO timing by default.
+ */
+ 
+static void sl82c105_set_piomode(struct ata_port *ap, struct ata_device *adev)
+{
+        sl82c105_configure_piomode(ap, adev, adev->pio_mode - XFER_PIO_0);
+}
+
+/**
+ *      sl82c105_configure_dmamode      -       set DMA mode in chip
+ *      @ap: ATA interface
+ *      @adev: ATA device
+ *
+ *      Load DMA cycle times into the chip ready for a DMA transfer
+ *      to occur.
+ */
+ 
+static void sl82c105_configure_dmamode(struct ata_port *ap, struct ata_device *adev)
+{
+        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+        static u16 dma_timing[3] = {
+                0x707, 0x201, 0x200
+        };
+        u16 dummy;
+        int timing = 0x44 + (8 * ap->port_no) + (4 * adev->devno);
+        int dma = adev->dma_mode - XFER_MW_DMA_0;
+        
+        pci_write_config_word(pdev, timing, dma_timing[dma]);
+        /* Can we lose this oddity of the old driver */
+        pci_read_config_word(pdev, timing, &dummy);
+}
+
+/**
+ *      sl82c105_set_dmamode    -       set initial DMA mode data
+ *      @ap: ATA interface
+ *      @adev: ATA device
+ *
+ *      Called to do the DMA mode setup. This replaces the PIO timings
+ *      for the device in question. Set appropriate PIO timings not DMA
+ *      timings at this point.
+ */
+ 
+static void sl82c105_set_dmamode(struct ata_port *ap, struct ata_device *adev)
+{
+        switch(adev->dma_mode) {
+                case XFER_MW_DMA_0:
+                        sl82c105_configure_piomode(ap, adev, 1);
+                        break;
+                case XFER_MW_DMA_1:
+                        sl82c105_configure_piomode(ap, adev, 3);
+                        break;
+                case XFER_MW_DMA_2:
+                        sl82c105_configure_piomode(ap, adev, 3);
+                        break;
+                default:
+                        BUG();
+        }                       
+}
+
+/**
+ *      sl82c105_reset_engine   -       Reset the DMA engine
+ *      @ap: ATA interface
+ *
+ *      The sl82c105 has some serious problems with the DMA engine
+ *      when transfers don't run as expected or ATAPI is used. The 
+ *      recommended fix is to reset the engine each use using a chip
+ *      test register.
+ */
+ 
+static void sl82c105_reset_engine(struct ata_port *ap)
+{
+        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+        u16 val;
+        
+        pci_read_config_word(pdev, 0x7E, &val);
+        pci_write_config_word(pdev, 0x7E, val | 4);
+        pci_write_config_word(pdev, 0x7E, val & ~4);
+}
+
+/**
+ *      sl82c105_bmdma_start            -       DMA engine begin
+ *      @qc: ATA command
+ *
+ *      Reset the DMA engine each use as recommended by the errata
+ *      document. 
+ *
+ *      FIXME: if we switch clock at BMDMA start/end we might get better
+ *      PIO performance on DMA capable devices.
+ */
+ 
+static void sl82c105_bmdma_start(struct ata_queued_cmd *qc)
+{
+        struct ata_port *ap = qc->ap;
+
+        sl82c105_reset_engine(ap);
+        
+        /* Set the clocks for DMA */
+        sl82c105_configure_dmamode(ap, qc->dev);
+        /* Activate DMA */      
+        ata_bmdma_start(qc);
+}
+
+/**
+ *      sl82c105_bmdma_end              -       DMA engine stop
+ *      @qc: ATA command
+ *
+ *      Reset the DMA engine each use as recommended by the errata
+ *      document.
+ *
+ *      This function is also called to turn off DMA when a timeout occurs
+ *      during DMA operation. In both cases we need to reset the engine,
+ *      so no actual eng_timeout handler is required.
+ *
+ *      We assume bmdma_stop is always called if bmdma_start as called. If
+ *      not then we may need to wrap qc_issue.
+ */
+ 
+static void sl82c105_bmdma_stop(struct ata_queued_cmd *qc)
+{
+        struct ata_port *ap = qc->ap;
+
+        ata_bmdma_stop(qc);
+        sl82c105_reset_engine(ap);
+        
+        /* This will redo the initial setup of the DMA device to matching
+           PIO timings */
+        sl82c105_set_dmamode(ap, qc->dev);
+}
+
+static struct scsi_host_template sl82c105_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,
+};
+
+static struct ata_port_operations sl82c105_port_ops = {
+        .port_disable   = ata_port_disable,
+        .set_piomode    = sl82c105_set_piomode,
+        .set_dmamode    = sl82c105_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,
+
+        .error_handler  = sl82c105_error_handler,
+
+        .bmdma_setup    = ata_bmdma_setup,
+        .bmdma_start    = sl82c105_bmdma_start,
+        .bmdma_stop     = sl82c105_bmdma_stop,
+        .bmdma_status   = ata_bmdma_status,
+
+        .qc_prep        = ata_qc_prep,
+        .qc_issue       = ata_qc_issue_prot,
+        .eng_timeout    = ata_eng_timeout,
+        .data_xfer      = ata_pio_data_xfer,
+
+        .irq_handler    = ata_interrupt,
+        .irq_clear      = ata_bmdma_irq_clear,
+        
+        .port_start     = ata_port_start,
+        .port_stop      = ata_port_stop,
+        .host_stop      = ata_host_stop
+};      
+
+/**
+ *      sl82c105_bridge_revision        -       find bridge version
+ *      @pdev: PCI device for the ATA function
+ *
+ *      Locates the PCI bridge associated with the ATA function and
+ *      providing it is a Winbond 553 reports the revision. If it cannot
+ *      find a revision or the right device it returns -1
+ */
+ 
+static int sl82c105_bridge_revision(struct pci_dev *pdev)
+{
+        struct pci_dev *bridge;
+        u8 rev;
+
+        /*
+         * The bridge should be part of the same device, but function 0.
+         */
+        bridge = pci_get_slot(pdev->bus,
+                               PCI_DEVFN(PCI_SLOT(pdev->devfn), 0));
+        if (!bridge)
+                return -1;
+
+        /*
+         * Make sure it is a Winbond 553 and is an ISA bridge.
+         */
+        if (bridge->vendor != PCI_VENDOR_ID_WINBOND ||
+            bridge->device != PCI_DEVICE_ID_WINBOND_83C553 ||
+            bridge->class >> 8 != PCI_CLASS_BRIDGE_ISA) {
+                pci_dev_put(bridge);
+                return -1;
+        }
+        /*
+         * We need to find function 0's revision, not function 1
+         */
+        pci_read_config_byte(bridge, PCI_REVISION_ID, &rev);
+
+        pci_dev_put(bridge);
+        return rev;
+}
+
+        
+static int sl82c105_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+        static struct ata_port_info info_dma = {
+                .sht = &sl82c105_sht,
+                .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
+                .pio_mask = 0x1f,
+                .mwdma_mask = 0x07,
+                .port_ops = &sl82c105_port_ops
+        };
+        static struct ata_port_info info_early = {
+                .sht = &sl82c105_sht,
+                .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
+                .pio_mask = 0x1f,
+                .port_ops = &sl82c105_port_ops
+        };
+        static struct ata_port_info *port_info[2] = { &info_early, &info_early };
+        u32 val;
+        int rev;
+
+        rev = sl82c105_bridge_revision(dev);
+        
+        if (rev == -1)
+                dev_printk(KERN_WARNING, &dev->dev, "pata_sl82c105: Unable to find bridge, disabling DMA.\n");
+        else if (rev <= 5)
+                dev_printk(KERN_WARNING, &dev->dev, "pata_sl82c105: Early bridge revision, no DMA available.\n");
+        else {
+                port_info[0] = &info_dma;
+                port_info[1] = &info_dma;
+        }
+        
+        pci_read_config_dword(dev, 0x40, &val);
+        val |= CTRL_P0EN | CTRL_P0F16 | CTRL_P1F16;
+        pci_write_config_dword(dev, 0x40, val);
+
+
+        return ata_pci_init_one(dev, port_info, 1); /* For now */
+}
+
+static struct pci_device_id sl82c105[] = {
+        { PCI_DEVICE(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105), },
+        { 0, },
+};
+
+static struct pci_driver sl82c105_pci_driver = {
+        .name           = DRV_NAME,
+        .id_table       = sl82c105,
+        .probe          = sl82c105_init_one,
+        .remove         = ata_pci_remove_one
+};
+
+static int __init sl82c105_init(void)
+{
+        return pci_register_driver(&sl82c105_pci_driver);
+}
+
+
+static void __exit sl82c105_exit(void)
+{
+        pci_unregister_driver(&sl82c105_pci_driver);
+}
+
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("low-level driver for Sl82c105");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, sl82c105);
+MODULE_VERSION(DRV_VERSION);
+
+module_init(sl82c105_init);
+module_exit(sl82c105_exit);