LXR linux/drivers/ata/pata

   1/*
   2 * Generic platform device PATA driver
   3 *
   4 * Copyright (C) 2006 - 2007  Paul Mundt
   5 *
   6 * Based on pata_pcmcia:
   7 *
   8 *   Copyright 2005-2006 Red Hat Inc, all rights reserved.
   9 *
  10 * This file is subject to the terms and conditions of the GNU General Public
  11 * License.  See the file "COPYING" in the main directory of this archive
  12 * for more details.
  13 */
  14#include <linux/kernel.h>
  15#include <linux/module.h>
  16#include <linux/blkdev.h>
  17#include <scsi/scsi_host.h>
  18#include <linux/ata.h>
  19#include <linux/libata.h>
  20#include <linux/platform_device.h>
  21#include <linux/ata_platform.h>
  22
  23#define DRV_NAME "pata_platform"
  24#define DRV_VERSION "1.2"
  25
  26static int pio_mask = 1;
  27
  28/*
  29 * Provide our own set_mode() as we don't want to change anything that has
  30 * already been configured..
  31 */
  32static int pata_platform_set_mode(struct ata_link *link, struct ata_device **unused)
  33{
  34        struct ata_device *dev;
  35
  36        ata_for_each_dev(dev, link, ENABLED) {
  37                /* We don't really care */
  38                dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
  39                dev->xfer_shift = ATA_SHIFT_PIO;
  40                dev->flags |= ATA_DFLAG_PIO;
  41                ata_dev_info(dev, "configured for PIO\n");
  42        }
  43        return 0;
  44}
  45
  46static struct scsi_host_template pata_platform_sht = {
  47        ATA_PIO_SHT(DRV_NAME),
  48};
  49
  50static struct ata_port_operations pata_platform_port_ops = {
  51        .inherits               = &ata_sff_port_ops,
  52        .sff_data_xfer          = ata_sff_data_xfer_noirq,
  53        .cable_detect           = ata_cable_unknown,
  54        .set_mode               = pata_platform_set_mode,
  55};
  56
  57static void pata_platform_setup_port(struct ata_ioports *ioaddr,
  58                                     unsigned int shift)
  59{
  60        /* Fixup the port shift for platforms that need it */
  61        ioaddr->data_addr       = ioaddr->cmd_addr + (ATA_REG_DATA    << shift);
  62        ioaddr->error_addr      = ioaddr->cmd_addr + (ATA_REG_ERR     << shift);
  63        ioaddr->feature_addr    = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift);
  64        ioaddr->nsect_addr      = ioaddr->cmd_addr + (ATA_REG_NSECT   << shift);
  65        ioaddr->lbal_addr       = ioaddr->cmd_addr + (ATA_REG_LBAL    << shift);
  66        ioaddr->lbam_addr       = ioaddr->cmd_addr + (ATA_REG_LBAM    << shift);
  67        ioaddr->lbah_addr       = ioaddr->cmd_addr + (ATA_REG_LBAH    << shift);
  68        ioaddr->device_addr     = ioaddr->cmd_addr + (ATA_REG_DEVICE  << shift);
  69        ioaddr->status_addr     = ioaddr->cmd_addr + (ATA_REG_STATUS  << shift);
  70        ioaddr->command_addr    = ioaddr->cmd_addr + (ATA_REG_CMD     << shift);
  71}
  72
  73/**
  74 *      __pata_platform_probe           -       attach a platform interface
  75 *      @dev: device
  76 *      @io_res: Resource representing I/O base
  77 *      @ctl_res: Resource representing CTL base
  78 *      @irq_res: Resource representing IRQ and its flags
  79 *      @ioport_shift: I/O port shift
  80 *      @__pio_mask: PIO mask
  81 *      @sht: scsi_host_template to use when registering
  82 *
  83 *      Register a platform bus IDE interface. Such interfaces are PIO and we
  84 *      assume do not support IRQ sharing.
  85 *
  86 *      Platform devices are expected to contain at least 2 resources per port:
  87 *
  88 *              - I/O Base (IORESOURCE_IO or IORESOURCE_MEM)
  89 *              - CTL Base (IORESOURCE_IO or IORESOURCE_MEM)
  90 *
  91 *      and optionally:
  92 *
  93 *              - IRQ      (IORESOURCE_IRQ)
  94 *
  95 *      If the base resources are both mem types, the ioremap() is handled
  96 *      here. For IORESOURCE_IO, it's assumed that there's no remapping
  97 *      necessary.
  98 *
  99 *      If no IRQ resource is present, PIO polling mode is used instead.
 100 */
 101int __pata_platform_probe(struct device *dev, struct resource *io_res,
 102                          struct resource *ctl_res, struct resource *irq_res,
 103                          unsigned int ioport_shift, int __pio_mask,
 104                          struct scsi_host_template *sht)
 105{
 106        struct ata_host *host;
 107        struct ata_port *ap;
 108        unsigned int mmio;
 109        int irq = 0;
 110        int irq_flags = 0;
 111
 112        /*
 113         * Check for MMIO
 114         */
 115        mmio = (( io_res->flags == IORESOURCE_MEM) &&
 116                (ctl_res->flags == IORESOURCE_MEM));
 117
 118        /*
 119         * And the IRQ
 120         */
 121        if (irq_res && irq_res->start > 0) {
 122                irq = irq_res->start;
 123                irq_flags = irq_res->flags & IRQF_TRIGGER_MASK;
 124        }
 125
 126        /*
 127         * Now that that's out of the way, wire up the port..
 128         */
 129        host = ata_host_alloc(dev, 1);
 130        if (!host)
 131                return -ENOMEM;
 132        ap = host->ports[0];
 133
 134        ap->ops = &pata_platform_port_ops;
 135        ap->pio_mask = __pio_mask;
 136        ap->flags |= ATA_FLAG_SLAVE_POSS;
 137
 138        /*
 139         * Use polling mode if there's no IRQ
 140         */
 141        if (!irq) {
 142                ap->flags |= ATA_FLAG_PIO_POLLING;
 143                ata_port_desc(ap, "no IRQ, using PIO polling");
 144        }
 145
 146        /*
 147         * Handle the MMIO case
 148         */
 149        if (mmio) {
 150                ap->ioaddr.cmd_addr = devm_ioremap(dev, io_res->start,
 151                                resource_size(io_res));
 152                ap->ioaddr.ctl_addr = devm_ioremap(dev, ctl_res->start,
 153                                resource_size(ctl_res));
 154        } else {
 155                ap->ioaddr.cmd_addr = devm_ioport_map(dev, io_res->start,
 156                                resource_size(io_res));
 157                ap->ioaddr.ctl_addr = devm_ioport_map(dev, ctl_res->start,
 158                                resource_size(ctl_res));
 159        }
 160        if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) {
 161                dev_err(dev, "failed to map IO/CTL base\n");
 162                return -ENOMEM;
 163        }
 164
 165        ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
 166
 167        pata_platform_setup_port(&ap->ioaddr, ioport_shift);
 168
 169        ata_port_desc(ap, "%s cmd 0x%llx ctl 0x%llx", mmio ? "mmio" : "ioport",
 170                      (unsigned long long)io_res->start,
 171                      (unsigned long long)ctl_res->start);
 172
 173        /* activate */
 174        return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL,
 175                                 irq_flags, sht);
 176}
 177EXPORT_SYMBOL_GPL(__pata_platform_probe);
 178
 179static int pata_platform_probe(struct platform_device *pdev)
 180{
 181        struct resource *io_res;
 182        struct resource *ctl_res;
 183        struct resource *irq_res;
 184        struct pata_platform_info *pp_info = dev_get_platdata(&pdev->dev);
 185
 186        /*
 187         * Simple resource validation ..
 188         */
 189        if ((pdev->num_resources != 3) && (pdev->num_resources != 2)) {
 190                dev_err(&pdev->dev, "invalid number of resources\n");
 191                return -EINVAL;
 192        }
 193
 194        /*
 195         * Get the I/O base first
 196         */
 197        io_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 198        if (io_res == NULL) {
 199                io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 200                if (unlikely(io_res == NULL))
 201                        return -EINVAL;
 202        }
 203
 204        /*
 205         * Then the CTL base
 206         */
 207        ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);
 208        if (ctl_res == NULL) {
 209                ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 210                if (unlikely(ctl_res == NULL))
 211                        return -EINVAL;
 212        }
 213
 214        /*
 215         * And the IRQ
 216         */
 217        irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 218
 219        return __pata_platform_probe(&pdev->dev, io_res, ctl_res, irq_res,
 220                                     pp_info ? pp_info->ioport_shift : 0,
 221                                     pio_mask, &pata_platform_sht);
 222}
 223
 224static struct platform_driver pata_platform_driver = {
 225        .probe          = pata_platform_probe,
 226        .remove         = ata_platform_remove_one,
 227        .driver = {
 228                .name           = DRV_NAME,
 229        },
 230};
 231
 232module_platform_driver(pata_platform_driver);
 233
 234module_param(pio_mask, int, 0);
 235
 236MODULE_AUTHOR("Paul Mundt");
 237MODULE_DESCRIPTION("low-level driver for platform device ATA");
 238MODULE_LICENSE("GPL");
 239MODULE_VERSION(DRV_VERSION);
 240MODULE_ALIAS("platform:" DRV_NAME);
 241