1 files changed, 205 insertions, 0 deletions

diff --git a/drivers/ata/pata_rz1000.c b/drivers/ata/pata_rz1000.c
new file mode 100644
index 000000000000..3c6d84fd4312
--- /dev/null
+++ b/drivers/ata/pata_rz1000.c
@@ -0,0 +1,205 @@
+/*
+ *  RZ1000/1001 driver based upon
+ *
+ *  linux/drivers/ide/pci/rz1000.c      Version 0.06    January 12, 2003
+ *  Copyright (C) 1995-1998  Linus Torvalds & author (see below)
+ *  Principal Author:  mlord@pobox.com (Mark Lord)
+ *
+ *  See linux/MAINTAINERS for address of current maintainer.
+ *
+ *  This file provides support for disabling the buggy read-ahead
+ *  mode of the RZ1000 IDE chipset, commonly used on Intel motherboards.
+ */
+
+#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_rz1000"
+#define DRV_VERSION     "0.2.2"
+
+
+/**
+ *      rz1000_prereset         -       probe begin
+ *      @ap: ATA port
+ *
+ *      Set up cable type and use generics
+ */
+
+static int rz1000_prereset(struct ata_port *ap)
+{
+        ap->cbl = ATA_CBL_PATA40;
+        return ata_std_prereset(ap);
+}
+
+/**
+ *      rz1000_error_handler            -       probe reset
+ *      @ap: ATA port
+ *
+ *      Perform the ATA standard reset sequence
+ */
+
+static void rz1000_error_handler(struct ata_port *ap)
+{
+        ata_bmdma_drive_eh(ap, rz1000_prereset, ata_std_softreset, NULL, ata_std_postreset);
+}
+
+/**
+ *      rz1000_set_mode         -       mode setting function
+ *      @ap: ATA interface
+ *
+ *      Use a non standard set_mode function. We don't want to be tuned. We
+ *      would prefer to be BIOS generic but for the fact our hardware is
+ *      whacked out.
+ */
+
+static void rz1000_set_mode(struct ata_port *ap)
+{
+        int i;
+
+        for (i = 0; i < ATA_MAX_DEVICES; i++) {
+                struct ata_device *dev = &ap->device[i];
+                if (ata_dev_enabled(dev)) {
+                        /* We don't really care */
+                        dev->pio_mode = XFER_PIO_0;
+                        dev->xfer_mode = XFER_PIO_0;
+                        dev->xfer_shift = ATA_SHIFT_PIO;
+                        dev->flags |= ATA_DFLAG_PIO;
+                }
+        }
+}
+
+
+static struct scsi_host_template rz1000_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 rz1000_port_ops = {
+        .set_mode       = rz1000_set_mode,
+
+        .port_disable   = ata_port_disable,
+        .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  = rz1000_error_handler,
+
+        .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,
+
+        .freeze         = ata_bmdma_freeze,
+        .thaw           = ata_bmdma_thaw,
+        .error_handler  = rz1000_error_handler,
+        .post_internal_cmd = ata_bmdma_post_internal_cmd,
+
+        .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
+};
+
+/**
+ *      rz1000_init_one - Register RZ1000 ATA PCI device with kernel services
+ *      @pdev: PCI device to register
+ *      @ent: Entry in rz1000_pci_tbl matching with @pdev
+ *
+ *      Configure an RZ1000 interface. This doesn't require much special
+ *      handling except that we *MUST* kill the chipset readahead or the
+ *      user may experience data corruption.
+ */
+
+static int rz1000_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+        static int printed_version;
+        struct ata_port_info *port_info[2];
+        u16 reg;
+        static struct ata_port_info info = {
+                .sht = &rz1000_sht,
+                .flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST,
+                .pio_mask = 0x1f,
+                .port_ops = &rz1000_port_ops
+        };
+
+        if (!printed_version++)
+                printk(KERN_DEBUG DRV_NAME " version " DRV_VERSION "\n");
+
+        /* Be exceptionally paranoid as we must be sure to apply the fix */
+        if (pci_read_config_word(pdev, 0x40, &reg) != 0)
+                goto fail;
+        reg &= 0xDFFF;
+        if (pci_write_config_word(pdev, 0x40, reg) != 0)
+                goto fail;
+        printk(KERN_INFO DRV_NAME ": disabled chipset readahead.\n");
+
+        port_info[0] = &info;
+        port_info[1] = &info;
+        return ata_pci_init_one(pdev, port_info, 2);
+fail:
+        printk(KERN_ERR DRV_NAME ": failed to disable read-ahead on chipset..\n");
+        /* Not safe to use so skip */
+        return -ENODEV;
+}
+
+static struct pci_device_id pata_rz1000[] = {
+        { PCI_DEVICE(PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1000), },
+        { PCI_DEVICE(PCI_VENDOR_ID_PCTECH, PCI_DEVICE_ID_PCTECH_RZ1001), },
+        { 0, },
+};
+
+static struct pci_driver rz1000_pci_driver = {
+        .name           = DRV_NAME,
+        .id_table       = pata_rz1000,
+        .probe          = rz1000_init_one,
+        .remove         = ata_pci_remove_one
+};
+
+
+static int __init rz1000_init(void)
+{
+        return pci_register_driver(&rz1000_pci_driver);
+}
+
+static void __exit rz1000_exit(void)
+{
+        pci_unregister_driver(&rz1000_pci_driver);
+}
+
+MODULE_AUTHOR("Alan Cox");
+MODULE_DESCRIPTION("low-level driver for RZ1000 PCI ATA");
+MODULE_LICENSE("GPL");
+MODULE_DEVICE_TABLE(pci, pata_rz1000);
+MODULE_VERSION(DRV_VERSION);
+
+module_init(rz1000_init);
+module_exit(rz1000_exit);
+