[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, 236 insertions, 0 deletions

diff --git a/drivers/ata/pata_ns87410.c b/drivers/ata/pata_ns87410.c
new file mode 100644
index 000000000000..93d6646d2954
--- /dev/null
+++ b/drivers/ata/pata_ns87410.c
@@ -0,0 +1,236 @@
+/*
+ * pata_ns87410.c       - National Semiconductor 87410 PATA for new ATA layer
+ *                        (C) 2006 Red Hat Inc
+ *                        Alan Cox <alan@redhat.com>
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *
+ *  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; see the file COPYING.  If not, write to
+ *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#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_ns87410"
+#define DRV_VERSION "0.4.2"
+
+/**
+ *      ns87410_pre_reset               -       probe begin
+ *      @ap: ATA port
+ *
+ *      Set up cable type and use generic probe init
+ */
+
+static int ns87410_pre_reset(struct ata_port *ap)
+{
+        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+        static const struct pci_bits ns87410_enable_bits[] = {
+                { 0x43, 1, 0x08, 0x08 },
+                { 0x47, 1, 0x08, 0x08 }
+        };
+
+        if (!pci_test_config_bits(pdev, &ns87410_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);
+}
+
+/**
+ *      ns87410_error_handler           -       probe reset
+ *      @ap: ATA port
+ *
+ *      Perform the ATA probe and bus reset sequence plus specific handling
+ *      for this hardware. The MPIIX has the enable bits in a different place
+ *      to PIIX4 and friends. As a pure PIO device it has no cable detect
+ */
+
+static void ns87410_error_handler(struct ata_port *ap)
+{
+        ata_bmdma_drive_eh(ap, ns87410_pre_reset, ata_std_softreset, NULL, ata_std_postreset);
+}
+
+/**
+ *      ns87410_set_piomode     -       set initial PIO mode data
+ *      @ap: ATA interface
+ *      @adev: ATA device
+ *
+ *      Program timing data. This is kept per channel not per device,
+ *      and only affects the data port.
+ */
+
+static void ns87410_set_piomode(struct ata_port *ap, struct ata_device *adev)
+{
+        struct pci_dev *pdev = to_pci_dev(ap->host->dev);
+        int port = 0x40 + 4 * ap->port_no;
+        u8 idetcr, idefr;
+        struct ata_timing at;
+
+        static const u8 activebits[15] = {
+                0, 1, 2, 3, 4,
+                5, 5, 6, 6, 6,
+                6, 7, 7, 7, 7
+        };
+
+        static const u8 recoverbits[12] = {
+                0, 1, 2, 3, 4, 5, 6, 6, 7, 7, 7, 7
+        };
+
+        pci_read_config_byte(pdev, port + 3, &idefr);
+
+        if (ata_pio_need_iordy(adev))
+                idefr |= 0x04;  /* IORDY enable */
+        else
+                idefr &= ~0x04;
+
+        if (ata_timing_compute(adev, adev->pio_mode, &at, 30303, 1) < 0) {
+                dev_printk(KERN_ERR, &pdev->dev, "unknown mode %d.\n", adev->pio_mode);
+                return;
+        }
+
+        at.active = FIT(at.active, 2, 16) - 2;
+        at.setup = FIT(at.setup, 1, 4) - 1;
+        at.recover = FIT(at.recover, 1, 12) - 1;
+
+        idetcr = (at.setup << 6) | (recoverbits[at.recover] << 3) | activebits[at.active];
+
+        pci_write_config_byte(pdev, port, idetcr);
+        pci_write_config_byte(pdev, port + 3, idefr);
+        /* We use ap->private_data as a pointer to the device currently
+           loaded for timing */
+        ap->private_data = adev;
+}
+
+/**
+ *      ns87410_qc_issue_prot   -       command issue
+ *      @qc: command pending
+ *
+ *      Called when the libata layer is about to issue a command. We wrap
+ *      this interface so that we can load the correct ATA timings if
+ *      neccessary.
+ */
+
+static unsigned int ns87410_qc_issue_prot(struct ata_queued_cmd *qc)
+{
+        struct ata_port *ap = qc->ap;
+        struct ata_device *adev = qc->dev;
+
+        /* If modes have been configured and the channel data is not loaded
+           then load it. We have to check if pio_mode is set as the core code
+           does not set adev->pio_mode to XFER_PIO_0 while probing as would be
+           logical */
+
+        if (adev->pio_mode && adev != ap->private_data)
+                ns87410_set_piomode(ap, adev);
+
+        return ata_qc_issue_prot(qc);
+}
+
+static struct scsi_host_template ns87410_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 ns87410_port_ops = {
+        .port_disable   = ata_port_disable,
+        .set_piomode    = ns87410_set_piomode,
+
+        .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  = ns87410_error_handler,
+        .post_internal_cmd = ata_bmdma_post_internal_cmd,
+
+        .qc_prep        = ata_qc_prep,
+        .qc_issue       = ns87410_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 ns87410_init_one(struct pci_dev *dev, const struct pci_device_id *id)
+{
+        static struct ata_port_info info = {
+                .sht = &ns87410_sht,
+                .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
+                .pio_mask = 0x0F,
+                .port_ops = &ns87410_port_ops
+        };
+        static struct ata_port_info *port_info[2] = {&info, &info};
+        return ata_pci_init_one(dev, port_info, 2);
+}
+
+static const struct pci_device_id ns87410[] = {
+        { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_87410), },
+        { 0, },
+};
+
+static struct pci_driver ns87410_pci_driver = {
+        .name           = DRV_NAME,
+        .id_table       = ns87410,
+        .probe          = ns87410_init_one,
+        .remove         = ata_pci_remove_one
+};
+
+static int __init ns87410_init(void)
+{
+        return pci_register_driver(&ns87410_pci_driver);
+}
+
+
+static void __exit ns87410_exit(void)
+{
+        pci_unregister_driver(&ns87410_pci_driver);
+}
+
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("low-level driver for Nat Semi 87410");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, ns87410);
+MODULE_VERSION(DRV_VERSION);
+
+module_init(ns87410_init);
+module_exit(ns87410_exit);