drivers/ata/pata_platform.c

   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
  26 static 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  */
  32 static 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
  46 static struct scsi_host_template pata_platform_sht = {
  47         ATA_PIO_SHT(DRV_NAME),
  48 };
  49
  50 static 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
  57 static 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  *
  82  *      Register a platform bus IDE interface. Such interfaces are PIO and we
  83  *      assume do not support IRQ sharing.
  84  *
  85  *      Platform devices are expected to contain at least 2 resources per port:
  86  *
  87  *              - I/O Base (IORESOURCE_IO or IORESOURCE_MEM)
  88  *              - CTL Base (IORESOURCE_IO or IORESOURCE_MEM)
  89  *
  90  *      and optionally:
  91  *
  92  *              - IRQ      (IORESOURCE_IRQ)
  93  *
  94  *      If the base resources are both mem types, the ioremap() is handled
  95  *      here. For IORESOURCE_IO, it's assumed that there's no remapping
  96  *      necessary.
  97  *
  98  *      If no IRQ resource is present, PIO polling mode is used instead.
  99  */
 100 int __pata_platform_probe(struct device *dev, struct resource *io_res,
 101                           struct resource *ctl_res, struct resource *irq_res,
 102                           unsigned int ioport_shift, int __pio_mask)
 103 {
 104         struct ata_host *host;
 105         struct ata_port *ap;
 106         unsigned int mmio;
 107         int irq = 0;
 108         int irq_flags = 0;
 109
 110         /*
 111          * Check for MMIO
 112          */
 113         mmio = (( io_res->flags == IORESOURCE_MEM) &&
 114                 (ctl_res->flags == IORESOURCE_MEM));
 115
 116         /*
 117          * And the IRQ
 118          */
 119         if (irq_res && irq_res->start > 0) {
 120                 irq = irq_res->start;
 121                 irq_flags = irq_res->flags;
 122         }
 123
 124         /*
 125          * Now that that's out of the way, wire up the port..
 126          */
 127         host = ata_host_alloc(dev, 1);
 128         if (!host)
 129                 return -ENOMEM;
 130         ap = host->ports[0];
 131
 132         ap->ops = &pata_platform_port_ops;
 133         ap->pio_mask = __pio_mask;
 134         ap->flags |= ATA_FLAG_SLAVE_POSS;
 135
 136         /*
 137          * Use polling mode if there's no IRQ
 138          */
 139         if (!irq) {
 140                 ap->flags |= ATA_FLAG_PIO_POLLING;
 141                 ata_port_desc(ap, "no IRQ, using PIO polling");
 142         }
 143
 144         /*
 145          * Handle the MMIO case
 146          */
 147         if (mmio) {
 148                 ap->ioaddr.cmd_addr = devm_ioremap(dev, io_res->start,
 149                                 resource_size(io_res));
 150                 ap->ioaddr.ctl_addr = devm_ioremap(dev, ctl_res->start,
 151                                 resource_size(ctl_res));
 152         } else {
 153                 ap->ioaddr.cmd_addr = devm_ioport_map(dev, io_res->start,
 154                                 resource_size(io_res));
 155                 ap->ioaddr.ctl_addr = devm_ioport_map(dev, ctl_res->start,
 156                                 resource_size(ctl_res));
 157         }
 158         if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) {
 159                 dev_err(dev, "failed to map IO/CTL base\n");
 160                 return -ENOMEM;
 161         }
 162
 163         ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
 164
 165         pata_platform_setup_port(&ap->ioaddr, ioport_shift);
 166
 167         ata_port_desc(ap, "%s cmd 0x%llx ctl 0x%llx", mmio ? "mmio" : "ioport",
 168                       (unsigned long long)io_res->start,
 169                       (unsigned long long)ctl_res->start);
 170
 171         /* activate */
 172         return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL,
 173                                  irq_flags, &pata_platform_sht);
 174 }
 175 EXPORT_SYMBOL_GPL(__pata_platform_probe);
 176
 177 static int pata_platform_probe(struct platform_device *pdev)
 178 {
 179         struct resource *io_res;
 180         struct resource *ctl_res;
 181         struct resource *irq_res;
 182         struct pata_platform_info *pp_info = dev_get_platdata(&pdev->dev);
 183
 184         /*
 185          * Simple resource validation ..
 186          */
 187         if ((pdev->num_resources != 3) && (pdev->num_resources != 2)) {
 188                 dev_err(&pdev->dev, "invalid number of resources\n");
 189                 return -EINVAL;
 190         }
 191
 192         /*
 193          * Get the I/O base first
 194          */
 195         io_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 196         if (io_res == NULL) {
 197                 io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 198                 if (unlikely(io_res == NULL))
 199                         return -EINVAL;
 200         }
 201
 202         /*
 203          * Then the CTL base
 204          */
 205         ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);
 206         if (ctl_res == NULL) {
 207                 ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 208                 if (unlikely(ctl_res == NULL))
 209                         return -EINVAL;
 210         }
 211
 212         /*
 213          * And the IRQ
 214          */
 215         irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 216         if (irq_res)
 217                 irq_res->flags = pp_info ? pp_info->irq_flags : 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);
 222 }
 223
 224 static struct platform_driver pata_platform_driver = {
 225         .probe          = pata_platform_probe,
 226         .remove         = ata_platform_remove_one,
 227         .driver = {
 228                 .name           = DRV_NAME,
 229                 .owner          = THIS_MODULE,
 230         },
 231 };
 232
 233 module_platform_driver(pata_platform_driver);
 234
 235 module_param(pio_mask, int, 0);
 236
 237 MODULE_AUTHOR("Paul Mundt");
 238 MODULE_DESCRIPTION("low-level driver for platform device ATA");
 239 MODULE_LICENSE("GPL");
 240 MODULE_VERSION(DRV_VERSION);
 241 MODULE_ALIAS("platform:" DRV_NAME);