[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, 292 insertions, 0 deletions

diff --git a/drivers/ata/pata_opti.c b/drivers/ata/pata_opti.c
new file mode 100644
index 000000000000..c3d01325e0e2
--- /dev/null
+++ b/drivers/ata/pata_opti.c
@@ -0,0 +1,292 @@
+/*
+ * pata_opti.c  - ATI PATA for new ATA layer
+ *                        (C) 2005 Red Hat Inc
+ *                        Alan Cox <alan@redhat.com>
+ *
+ * Based on
+ *  linux/drivers/ide/pci/opti621.c             Version 0.7     Sept 10, 2002
+ *
+ *  Copyright (C) 1996-1998  Linus Torvalds & authors (see below)
+ *
+ * Authors:
+ * Jaromir Koutek <miri@punknet.cz>,
+ * Jan Harkes <jaharkes@cwi.nl>,
+ * Mark Lord <mlord@pobox.com>
+ * Some parts of code are from ali14xx.c and from rz1000.c.
+ *
+ * Also consulted the FreeBSD prototype driver by Kevin Day to try
+ * and resolve some confusions. Further documentation can be found in
+ * Ralf Brown's interrupt list
+ *
+ * If you have other variants of the Opti range (Viper/Vendetta) please
+ * try this driver with those PCI idents and report back. For the later
+ * chips see the pata_optidma driver
+ *
+ */
+
+#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_opti"
+#define DRV_VERSION "0.2.4"
+
+enum {
+        READ_REG        = 0,    /* index of Read cycle timing register */
+        WRITE_REG       = 1,    /* index of Write cycle timing register */
+        CNTRL_REG       = 3,    /* index of Control register */
+        STRAP_REG       = 5,    /* index of Strap register */
+        MISC_REG        = 6     /* index of Miscellaneous register */
+};
+
+/**
+ *      opti_pre_reset          -       probe begin
+ *      @ap: ATA port
+ *
+ *      Set up cable type and use generic probe init
+ */
+
+static int opti_pre_reset(struct ata_port *ap)
+{
+        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+        static const struct pci_bits opti_enable_bits[] = {
+                { 0x45, 1, 0x80, 0x00 },
+                { 0x40, 1, 0x08, 0x00 }
+        };
+
+        if (!pci_test_config_bits(pdev, &opti_enable_bits[ap->port_no])) {
+                ata_port_disable(ap);
+                printk(KERN_INFO "ata%u: port disabled. ignoring.\n", ap->id);
+                return 0;
+        }
+        ap->cbl = ATA_CBL_PATA40;
+        return ata_std_prereset(ap);
+}
+
+/**
+ *      opti_probe_reset                -       probe reset
+ *      @ap: ATA port
+ *
+ *      Perform the ATA probe and bus reset sequence plus specific handling
+ *      for this hardware. The Opti needs little handling - we have no UDMA66
+ *      capability that needs cable detection. All we must do is check the port
+ *      is enabled.
+ */
+
+static void opti_error_handler(struct ata_port *ap)
+{
+        ata_bmdma_drive_eh(ap, opti_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
+}
+
+/**
+ *      opti_write_reg          -       control register setup
+ *      @ap: ATA port
+ *      @value: value
+ *      @reg: control register number
+ *
+ *      The Opti uses magic 'trapdoor' register accesses to do configuration
+ *      rather than using PCI space as other controllers do. The double inw
+ *      on the error register activates configuration mode. We can then write
+ *      the control register
+ */
+
+static void opti_write_reg(struct ata_port *ap, u8 val, int reg)
+{
+        unsigned long regio = ap->ioaddr.cmd_addr;
+
+        /* These 3 unlock the control register access */
+        inw(regio + 1);
+        inw(regio + 1);
+        outb(3, regio + 2);
+
+        /* Do the I/O */
+        outb(val, regio + reg);
+
+        /* Relock */
+        outb(0x83, regio + 2);
+}
+
+#if 0
+/**
+ *      opti_read_reg           -       control register read
+ *      @ap: ATA port
+ *      @reg: control register number
+ *
+ *      The Opti uses magic 'trapdoor' register accesses to do configuration
+ *      rather than using PCI space as other controllers do. The double inw
+ *      on the error register activates configuration mode. We can then read
+ *      the control register
+ */
+
+static u8 opti_read_reg(struct ata_port *ap, int reg)
+{
+        unsigned long regio = ap->ioaddr.cmd_addr;
+        u8 ret;
+        inw(regio + 1);
+        inw(regio + 1);
+        outb(3, regio + 2);
+        ret = inb(regio + reg);
+        outb(0x83, regio + 2);
+}
+#endif
+
+/**
+ *      opti_set_piomode        -       set initial PIO mode data
+ *      @ap: ATA interface
+ *      @adev: ATA device
+ *
+ *      Called to do the PIO mode setup. Timing numbers are taken from
+ *      the FreeBSD driver then pre computed to keep the code clean. There
+ *      are two tables depending on the hardware clock speed.
+ */
+
+static void opti_set_piomode(struct ata_port *ap, struct ata_device *adev)
+{
+        struct ata_device *pair = ata_dev_pair(adev);
+        int clock;
+        int pio = adev->pio_mode - XFER_PIO_0;
+        unsigned long regio = ap->ioaddr.cmd_addr;
+        u8 addr;
+
+        /* Address table precomputed with prefetch off and a DCLK of 2 */
+        static const u8 addr_timing[2][5] = {
+                { 0x30, 0x20, 0x20, 0x10, 0x10 },
+                { 0x20, 0x20, 0x10, 0x10, 0x10 }
+        };
+        static const u8 data_rec_timing[2][5] = {
+                { 0x6B, 0x56, 0x42, 0x32, 0x31 },
+                { 0x58, 0x44, 0x32, 0x22, 0x21 }
+        };
+
+        outb(0xff, regio + 5);
+        clock = inw(regio + 5) & 1;
+
+        /*
+         *      As with many controllers the address setup time is shared
+         *      and must suit both devices if present.
+         */
+
+        addr = addr_timing[clock][pio];
+        if (pair) {
+                /* Hardware constraint */
+                u8 pair_addr = addr_timing[clock][pair->pio_mode - XFER_PIO_0];
+                if (pair_addr > addr)
+                        addr = pair_addr;
+        }
+
+        /* Commence primary programming sequence */
+        opti_write_reg(ap, adev->devno, MISC_REG);
+        opti_write_reg(ap, data_rec_timing[clock][pio], READ_REG);
+        opti_write_reg(ap, data_rec_timing[clock][pio], WRITE_REG);
+        opti_write_reg(ap, addr, MISC_REG);
+
+        /* Programming sequence complete, override strapping */
+        opti_write_reg(ap, 0x85, CNTRL_REG);
+}
+
+static struct scsi_host_template opti_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 opti_port_ops = {
+        .port_disable   = ata_port_disable,
+        .set_piomode    = opti_set_piomode,
+/*      .set_dmamode    = opti_set_dmamode, */
+        .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,
+
+        .freeze         = ata_bmdma_freeze,
+        .thaw           = ata_bmdma_thaw,
+        .error_handler  = opti_error_handler,
+        .post_internal_cmd = ata_bmdma_post_internal_cmd,
+
+        .bmdma_setup    = ata_bmdma_setup,
+        .bmdma_start    = ata_bmdma_start,
+        .bmdma_stop     = ata_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
+};
+
+static int opti_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+        static struct ata_port_info info = {
+                .sht = &opti_sht,
+                .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
+                .pio_mask = 0x1f,
+                .port_ops = &opti_port_ops
+        };
+        static struct ata_port_info *port_info[2] = { &info, &info };
+        static int printed_version;
+
+        if (!printed_version++)
+                dev_printk(KERN_DEBUG, &dev->dev, "version " DRV_VERSION "\n");
+
+        return ata_pci_init_one(dev, port_info, 2);
+}
+
+static const struct pci_device_id opti[] = {
+        { PCI_VENDOR_ID_OPTI, PCI_DEVICE_ID_OPTI_82C621, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+        { PCI_VENDOR_ID_OPTI, PCI_DEVICE_ID_OPTI_82C825, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 1},
+        { 0, },
+};
+
+static struct pci_driver opti_pci_driver = {
+        .name           = DRV_NAME,
+        .id_table       = opti,
+        .probe          = opti_init_one,
+        .remove         = ata_pci_remove_one
+};
+
+static int __init opti_init(void)
+{
+        return pci_register_driver(&opti_pci_driver);
+}
+
+
+static void __exit opti_exit(void)
+{
+        pci_unregister_driver(&opti_pci_driver);
+}
+
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("low-level driver for Opti 621/621X");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, opti);
+MODULE_VERSION(DRV_VERSION);
+
+module_init(opti_init);
+module_exit(opti_exit);