[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, 285 insertions, 0 deletions

diff --git a/drivers/ata/pata_triflex.c b/drivers/ata/pata_triflex.c
new file mode 100644
index 00000000000..7dd6ea3a21e
--- /dev/null
+++ b/drivers/ata/pata_triflex.c
@@ -0,0 +1,285 @@
+/*
+ * pata_triflex.c       - Compaq PATA for new ATA layer
+ *                        (C) 2005 Red Hat Inc
+ *                        Alan Cox <alan@redhat.com>
+ *
+ * based upon
+ *
+ * triflex.c
+ *
+ * IDE Chipset driver for the Compaq TriFlex IDE controller.
+ *
+ * Known to work with the Compaq Workstation 5x00 series.
+ *
+ * Copyright (C) 2002 Hewlett-Packard Development Group, L.P.
+ * Author: Torben Mathiasen <torben.mathiasen@hp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * Loosely based on the piix & svwks drivers.
+ *
+ * Documentation:
+ *      Not publically available.
+ */
+
+#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_triflex"
+#define DRV_VERSION "0.2.5"
+
+/**
+ *      triflex_probe_init              -       probe begin
+ *      @ap: ATA port
+ *
+ *      Set up cable type and use generic probe init
+ */
+
+static int triflex_probe_init(struct ata_port *ap)
+{
+        static const struct pci_bits triflex_enable_bits[] = {
+                { 0x80, 1, 0x01, 0x01 },
+                { 0x80, 1, 0x02, 0x02 }
+        };
+
+        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+        
+        if (!pci_test_config_bits(pdev, &triflex_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);
+}
+
+
+
+static void triflex_error_handler(struct ata_port *ap)
+{
+        ata_bmdma_drive_eh(ap, triflex_probe_init, ata_std_softreset, NULL, ata_std_postreset);
+}
+
+/**
+ *      triflex_load_timing             -       timing configuration
+ *      @ap: ATA interface
+ *      @adev: Device on the bus
+ *      @speed: speed to configure
+ *
+ *      The Triflex has one set of timings per device per channel. This
+ *      means we must do some switching. As the PIO and DMA timings don't
+ *      match we have to do some reloading unlike PIIX devices where tuning
+ *      tricks can avoid it.
+ */
+
+static void triflex_load_timing(struct ata_port *ap, struct ata_device *adev, int speed)
+{
+        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+        u32 timing = 0;
+        u32 triflex_timing, old_triflex_timing;
+        int channel_offset = ap->port_no ? 0x74: 0x70;
+        unsigned int is_slave   = (adev->devno != 0);
+
+
+        pci_read_config_dword(pdev, channel_offset, &old_triflex_timing);
+        triflex_timing = old_triflex_timing;
+
+        switch(speed)
+        {
+                case XFER_MW_DMA_2:
+                        timing = 0x0103;break;
+                case XFER_MW_DMA_1:
+                        timing = 0x0203;break;
+                case XFER_MW_DMA_0:
+                        timing = 0x0808;break;
+                case XFER_SW_DMA_2:
+                case XFER_SW_DMA_1:
+                case XFER_SW_DMA_0:
+                        timing = 0x0F0F;break;
+                case XFER_PIO_4:
+                        timing = 0x0202;break;
+                case XFER_PIO_3:
+                        timing = 0x0204;break;
+                case XFER_PIO_2:
+                        timing = 0x0404;break;
+                case XFER_PIO_1:
+                        timing = 0x0508;break;
+                case XFER_PIO_0:
+                        timing = 0x0808;break;
+                default:
+                        BUG();
+        }
+        triflex_timing &= ~ (0xFFFF << (16 * is_slave));
+        triflex_timing |= (timing << (16 * is_slave));
+
+        if (triflex_timing != old_triflex_timing)
+                pci_write_config_dword(pdev, channel_offset, triflex_timing);
+}
+
+/**
+ *      triflex_set_piomode     -       set initial PIO mode data
+ *      @ap: ATA interface
+ *      @adev: ATA device
+ *
+ *      Use the timing loader to set up the PIO mode. We have to do this
+ *      because DMA start/stop will only be called once DMA occurs. If there
+ *      has been no DMA then the PIO timings are still needed.
+ */
+static void triflex_set_piomode(struct ata_port *ap, struct ata_device *adev)
+{
+        triflex_load_timing(ap, adev, adev->pio_mode);
+}
+
+/**
+ *      triflex_dma_start       -       DMA start callback
+ *      @qc: Command in progress
+ *
+ *      Usually drivers set the DMA timing at the point the set_dmamode call
+ *      is made. Triflex however requires we load new timings on the
+ *      transition or keep matching PIO/DMA pairs (ie MWDMA2/PIO4 etc).
+ *      We load the DMA timings just before starting DMA and then restore
+ *      the PIO timing when the DMA is finished.
+ */
+
+static void triflex_bmdma_start(struct ata_queued_cmd *qc)
+{
+        triflex_load_timing(qc->ap, qc->dev, qc->dev->dma_mode);
+        ata_bmdma_start(qc);
+}
+
+/**
+ *      triflex_dma_stop        -       DMA stop callback
+ *      @ap: ATA interface
+ *      @adev: ATA device
+ *
+ *      We loaded new timings in dma_start, as a result we need to restore
+ *      the PIO timings in dma_stop so that the next command issue gets the
+ *      right clock values.
+ */
+
+static void triflex_bmdma_stop(struct ata_queued_cmd *qc)
+{
+        ata_bmdma_stop(qc);
+        triflex_load_timing(qc->ap, qc->dev, qc->dev->pio_mode);
+}
+
+static struct scsi_host_template triflex_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 triflex_port_ops = {
+        .port_disable   = ata_port_disable,
+        .set_piomode    = triflex_set_piomode,
+        .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,
+
+        .freeze         = ata_bmdma_freeze,
+        .thaw           = ata_bmdma_thaw,
+        .error_handler  = triflex_error_handler,
+        .post_internal_cmd = ata_bmdma_post_internal_cmd,
+
+        .bmdma_setup    = ata_bmdma_setup,
+        .bmdma_start    = triflex_bmdma_start,
+        .bmdma_stop     = triflex_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 triflex_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+        static struct ata_port_info info = {
+                .sht = &triflex_sht,
+                .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
+                .pio_mask = 0x1f,
+                .mwdma_mask = 0x07,
+                .port_ops = &triflex_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 triflex[] = {
+        { PCI_VENDOR_ID_COMPAQ, PCI_DEVICE_ID_COMPAQ_TRIFLEX_IDE,
+                                  PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0 },
+        { 0, },
+};
+
+static struct pci_driver triflex_pci_driver = {
+        .name           = DRV_NAME,
+        .id_table       = triflex,
+        .probe          = triflex_init_one,
+        .remove         = ata_pci_remove_one
+};
+
+static int __init triflex_init(void)
+{
+        return pci_register_driver(&triflex_pci_driver);
+}
+
+
+static void __exit triflex_exit(void)
+{
+        pci_unregister_driver(&triflex_pci_driver);
+}
+
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("low-level driver for Compaq Triflex");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, triflex);
+MODULE_VERSION(DRV_VERSION);
+
+module_init(triflex_init);
+module_exit(triflex_exit);