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/init.h>
  17 #include <linux/blkdev.h>
  18 #include <scsi/scsi_host.h>
  19 #include <linux/ata.h>
  20 #include <linux/libata.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/ata_platform.h>
  23
  24 #define DRV_NAME "pata_platform"
  25 #define DRV_VERSION "1.2"
  26
  27 static int pio_mask = 1;
  28
  29 /*
  30  * Provide our own set_mode() as we don't want to change anything that has
  31  * already been configured..
  32  */
  33 static int pata_platform_set_mode(struct ata_link *link, struct ata_device **unused)
  34 {
  35         struct ata_device *dev;
  36
  37         ata_for_each_dev(dev, link, ENABLED) {
  38                 /* We don't really care */
  39                 dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
  40                 dev->xfer_shift = ATA_SHIFT_PIO;
  41                 dev->flags |= ATA_DFLAG_PIO;
  42                 ata_dev_info(dev, "configured for PIO\n");
  43         }
  44         return 0;
  45 }
  46
  47 static struct scsi_host_template pata_platform_sht = {
  48         ATA_PIO_SHT(DRV_NAME),
  49 };
  50
  51 static struct ata_port_operations pata_platform_port_ops = {
  52         .inherits               = &ata_sff_port_ops,
  53         .sff_data_xfer          = ata_sff_data_xfer_noirq,
  54         .cable_detect           = ata_cable_unknown,
  55         .set_mode               = pata_platform_set_mode,
  56 };
  57
  58 static void pata_platform_setup_port(struct ata_ioports *ioaddr,
  59                                      unsigned int shift)
  60 {
  61         /* Fixup the port shift for platforms that need it */
  62         ioaddr->data_addr       = ioaddr->cmd_addr + (ATA_REG_DATA    << shift);
  63         ioaddr->error_addr      = ioaddr->cmd_addr + (ATA_REG_ERR     << shift);
  64         ioaddr->feature_addr    = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift);
  65         ioaddr->nsect_addr      = ioaddr->cmd_addr + (ATA_REG_NSECT   << shift);
  66         ioaddr->lbal_addr       = ioaddr->cmd_addr + (ATA_REG_LBAL    << shift);
  67         ioaddr->lbam_addr       = ioaddr->cmd_addr + (ATA_REG_LBAM    << shift);
  68         ioaddr->lbah_addr       = ioaddr->cmd_addr + (ATA_REG_LBAH    << shift);
  69         ioaddr->device_addr     = ioaddr->cmd_addr + (ATA_REG_DEVICE  << shift);
  70         ioaddr->status_addr     = ioaddr->cmd_addr + (ATA_REG_STATUS  << shift);
  71         ioaddr->command_addr    = ioaddr->cmd_addr + (ATA_REG_CMD     << shift);
  72 }
  73
  74 /**
  75  *      __pata_platform_probe           -       attach a platform interface
  76  *      @dev: device
  77  *      @io_res: Resource representing I/O base
  78  *      @ctl_res: Resource representing CTL base
  79  *      @irq_res: Resource representing IRQ and its flags
  80  *      @ioport_shift: I/O port shift
  81  *      @__pio_mask: PIO mask
  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  */
 101 int __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 {
 105         struct ata_host *host;
 106         struct ata_port *ap;
 107         unsigned int mmio;
 108         int irq = 0;
 109         int irq_flags = 0;
 110
 111         /*
 112          * Check for MMIO
 113          */
 114         mmio = (( io_res->flags == IORESOURCE_MEM) &&
 115                 (ctl_res->flags == IORESOURCE_MEM));
 116
 117         /*
 118          * And the IRQ
 119          */
 120         if (irq_res && irq_res->start > 0) {
 121                 irq = irq_res->start;
 122                 irq_flags = irq_res->flags;
 123         }
 124
 125         /*
 126          * Now that that's out of the way, wire up the port..
 127          */
 128         host = ata_host_alloc(dev, 1);
 129         if (!host)
 130                 return -ENOMEM;
 131         ap = host->ports[0];
 132
 133         ap->ops = &pata_platform_port_ops;
 134         ap->pio_mask = __pio_mask;
 135         ap->flags |= ATA_FLAG_SLAVE_POSS;
 136
 137         /*
 138          * Use polling mode if there's no IRQ
 139          */
 140         if (!irq) {
 141                 ap->flags |= ATA_FLAG_PIO_POLLING;
 142                 ata_port_desc(ap, "no IRQ, using PIO polling");
 143         }
 144
 145         /*
 146          * Handle the MMIO case
 147          */
 148         if (mmio) {
 149                 ap->ioaddr.cmd_addr = devm_ioremap(dev, io_res->start,
 150                                 resource_size(io_res));
 151                 ap->ioaddr.ctl_addr = devm_ioremap(dev, ctl_res->start,
 152                                 resource_size(ctl_res));
 153         } else {
 154                 ap->ioaddr.cmd_addr = devm_ioport_map(dev, io_res->start,
 155                                 resource_size(io_res));
 156                 ap->ioaddr.ctl_addr = devm_ioport_map(dev, ctl_res->start,
 157                                 resource_size(ctl_res));
 158         }
 159         if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) {
 160                 dev_err(dev, "failed to map IO/CTL base\n");
 161                 return -ENOMEM;
 162         }
 163
 164         ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
 165
 166         pata_platform_setup_port(&ap->ioaddr, ioport_shift);
 167
 168         ata_port_desc(ap, "%s cmd 0x%llx ctl 0x%llx", mmio ? "mmio" : "ioport",
 169                       (unsigned long long)io_res->start,
 170                       (unsigned long long)ctl_res->start);
 171
 172         /* activate */
 173         return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL,
 174                                  irq_flags, &pata_platform_sht);
 175 }
 176 EXPORT_SYMBOL_GPL(__pata_platform_probe);
 177
 178 static int pata_platform_probe(struct platform_device *pdev)
 179 {
 180         struct resource *io_res;
 181         struct resource *ctl_res;
 182         struct resource *irq_res;
 183         struct pata_platform_info *pp_info = dev_get_platdata(&pdev->dev);
 184
 185         /*
 186          * Simple resource validation ..
 187          */
 188         if ((pdev->num_resources != 3) && (pdev->num_resources != 2)) {
 189                 dev_err(&pdev->dev, "invalid number of resources\n");
 190                 return -EINVAL;
 191         }
 192
 193         /*
 194          * Get the I/O base first
 195          */
 196         io_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 197         if (io_res == NULL) {
 198                 io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 199                 if (unlikely(io_res == NULL))
 200                         return -EINVAL;
 201         }
 202
 203         /*
 204          * Then the CTL base
 205          */
 206         ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);
 207         if (ctl_res == NULL) {
 208                 ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 209                 if (unlikely(ctl_res == NULL))
 210                         return -EINVAL;
 211         }
 212
 213         /*
 214          * And the IRQ
 215          */
 216         irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 217         if (irq_res)
 218                 irq_res->flags = pp_info ? pp_info->irq_flags : 0;
 219
 220         return __pata_platform_probe(&pdev->dev, io_res, ctl_res, irq_res,
 221                                      pp_info ? pp_info->ioport_shift : 0,
 222                                      pio_mask);
 223 }
 224
 225 static struct platform_driver pata_platform_driver = {
 226         .probe          = pata_platform_probe,
 227         .remove         = ata_platform_remove_one,
 228         .driver = {
 229                 .name           = DRV_NAME,
 230                 .owner          = THIS_MODULE,
 231         },
 232 };
 233
 234 module_platform_driver(pata_platform_driver);
 235
 236 module_param(pio_mask, int, 0);
 237
 238 MODULE_AUTHOR("Paul Mundt");
 239 MODULE_DESCRIPTION("low-level driver for platform device ATA");
 240 MODULE_LICENSE("GPL");
 241 MODULE_VERSION(DRV_VERSION);
 242 MODULE_ALIAS("platform:" DRV_NAME);