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_printk(dev, KERN_INFO, "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         .port_start             = ATA_OP_NULL,
  57 };
  58
  59 static void pata_platform_setup_port(struct ata_ioports *ioaddr,
  60                                      unsigned int shift)
  61 {
  62         /* Fixup the port shift for platforms that need it */
  63         ioaddr->data_addr       = ioaddr->cmd_addr + (ATA_REG_DATA    << shift);
  64         ioaddr->error_addr      = ioaddr->cmd_addr + (ATA_REG_ERR     << shift);
  65         ioaddr->feature_addr    = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift);
  66         ioaddr->nsect_addr      = ioaddr->cmd_addr + (ATA_REG_NSECT   << shift);
  67         ioaddr->lbal_addr       = ioaddr->cmd_addr + (ATA_REG_LBAL    << shift);
  68         ioaddr->lbam_addr       = ioaddr->cmd_addr + (ATA_REG_LBAM    << shift);
  69         ioaddr->lbah_addr       = ioaddr->cmd_addr + (ATA_REG_LBAH    << shift);
  70         ioaddr->device_addr     = ioaddr->cmd_addr + (ATA_REG_DEVICE  << shift);
  71         ioaddr->status_addr     = ioaddr->cmd_addr + (ATA_REG_STATUS  << shift);
  72         ioaddr->command_addr    = ioaddr->cmd_addr + (ATA_REG_CMD     << shift);
  73 }
  74
  75 /**
  76  *      __pata_platform_probe           -       attach a platform interface
  77  *      @dev: device
  78  *      @io_res: Resource representing I/O base
  79  *      @ctl_res: Resource representing CTL base
  80  *      @irq_res: Resource representing IRQ and its flags
  81  *      @ioport_shift: I/O port shift
  82  *      @__pio_mask: PIO mask
  83  *
  84  *      Register a platform bus IDE interface. Such interfaces are PIO and we
  85  *      assume do not support IRQ sharing.
  86  *
  87  *      Platform devices are expected to contain at least 2 resources per port:
  88  *
  89  *              - I/O Base (IORESOURCE_IO or IORESOURCE_MEM)
  90  *              - CTL Base (IORESOURCE_IO or IORESOURCE_MEM)
  91  *
  92  *      and optionally:
  93  *
  94  *              - IRQ      (IORESOURCE_IRQ)
  95  *
  96  *      If the base resources are both mem types, the ioremap() is handled
  97  *      here. For IORESOURCE_IO, it's assumed that there's no remapping
  98  *      necessary.
  99  *
 100  *      If no IRQ resource is present, PIO polling mode is used instead.
 101  */
 102 int __devinit __pata_platform_probe(struct device *dev,
 103                                     struct resource *io_res,
 104                                     struct resource *ctl_res,
 105                                     struct resource *irq_res,
 106                                     unsigned int ioport_shift,
 107                                     int __pio_mask)
 108 {
 109         struct ata_host *host;
 110         struct ata_port *ap;
 111         unsigned int mmio;
 112         int irq = 0;
 113         int irq_flags = 0;
 114
 115         /*
 116          * Check for MMIO
 117          */
 118         mmio = (( io_res->flags == IORESOURCE_MEM) &&
 119                 (ctl_res->flags == IORESOURCE_MEM));
 120
 121         /*
 122          * And the IRQ
 123          */
 124         if (irq_res && irq_res->start > 0) {
 125                 irq = irq_res->start;
 126                 irq_flags = irq_res->flags;
 127         }
 128
 129         /*
 130          * Now that that's out of the way, wire up the port..
 131          */
 132         host = ata_host_alloc(dev, 1);
 133         if (!host)
 134                 return -ENOMEM;
 135         ap = host->ports[0];
 136
 137         ap->ops = &pata_platform_port_ops;
 138         ap->pio_mask = __pio_mask;
 139         ap->flags |= ATA_FLAG_SLAVE_POSS;
 140
 141         /*
 142          * Use polling mode if there's no IRQ
 143          */
 144         if (!irq) {
 145                 ap->flags |= ATA_FLAG_PIO_POLLING;
 146                 ata_port_desc(ap, "no IRQ, using PIO polling");
 147         }
 148
 149         /*
 150          * Handle the MMIO case
 151          */
 152         if (mmio) {
 153                 ap->ioaddr.cmd_addr = devm_ioremap(dev, io_res->start,
 154                                 resource_size(io_res));
 155                 ap->ioaddr.ctl_addr = devm_ioremap(dev, ctl_res->start,
 156                                 resource_size(ctl_res));
 157         } else {
 158                 ap->ioaddr.cmd_addr = devm_ioport_map(dev, io_res->start,
 159                                 resource_size(io_res));
 160                 ap->ioaddr.ctl_addr = devm_ioport_map(dev, ctl_res->start,
 161                                 resource_size(ctl_res));
 162         }
 163         if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) {
 164                 dev_err(dev, "failed to map IO/CTL base\n");
 165                 return -ENOMEM;
 166         }
 167
 168         ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
 169
 170         pata_platform_setup_port(&ap->ioaddr, ioport_shift);
 171
 172         ata_port_desc(ap, "%s cmd 0x%llx ctl 0x%llx", mmio ? "mmio" : "ioport",
 173                       (unsigned long long)io_res->start,
 174                       (unsigned long long)ctl_res->start);
 175
 176         /* activate */
 177         return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL,
 178                                  irq_flags, &pata_platform_sht);
 179 }
 180 EXPORT_SYMBOL_GPL(__pata_platform_probe);
 181
 182 /**
 183  *      __pata_platform_remove          -       unplug a platform interface
 184  *      @dev: device
 185  *
 186  *      A platform bus ATA device has been unplugged. Perform the needed
 187  *      cleanup. Also called on module unload for any active devices.
 188  */
 189 int __pata_platform_remove(struct device *dev)
 190 {
 191         struct ata_host *host = dev_get_drvdata(dev);
 192
 193         ata_host_detach(host);
 194
 195         return 0;
 196 }
 197 EXPORT_SYMBOL_GPL(__pata_platform_remove);
 198
 199 static int __devinit pata_platform_probe(struct platform_device *pdev)
 200 {
 201         struct resource *io_res;
 202         struct resource *ctl_res;
 203         struct resource *irq_res;
 204         struct pata_platform_info *pp_info = pdev->dev.platform_data;
 205
 206         /*
 207          * Simple resource validation ..
 208          */
 209         if ((pdev->num_resources != 3) && (pdev->num_resources != 2)) {
 210                 dev_err(&pdev->dev, "invalid number of resources\n");
 211                 return -EINVAL;
 212         }
 213
 214         /*
 215          * Get the I/O base first
 216          */
 217         io_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 218         if (io_res == NULL) {
 219                 io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 220                 if (unlikely(io_res == NULL))
 221                         return -EINVAL;
 222         }
 223
 224         /*
 225          * Then the CTL base
 226          */
 227         ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);
 228         if (ctl_res == NULL) {
 229                 ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 230                 if (unlikely(ctl_res == NULL))
 231                         return -EINVAL;
 232         }
 233
 234         /*
 235          * And the IRQ
 236          */
 237         irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 238         if (irq_res)
 239                 irq_res->flags = pp_info ? pp_info->irq_flags : 0;
 240
 241         return __pata_platform_probe(&pdev->dev, io_res, ctl_res, irq_res,
 242                                      pp_info ? pp_info->ioport_shift : 0,
 243                                      pio_mask);
 244 }
 245
 246 static int __devexit pata_platform_remove(struct platform_device *pdev)
 247 {
 248         return __pata_platform_remove(&pdev->dev);
 249 }
 250
 251 static struct platform_driver pata_platform_driver = {
 252         .probe          = pata_platform_probe,
 253         .remove         = __devexit_p(pata_platform_remove),
 254         .driver = {
 255                 .name           = DRV_NAME,
 256                 .owner          = THIS_MODULE,
 257         },
 258 };
 259
 260 static int __init pata_platform_init(void)
 261 {
 262         return platform_driver_register(&pata_platform_driver);
 263 }
 264
 265 static void __exit pata_platform_exit(void)
 266 {
 267         platform_driver_unregister(&pata_platform_driver);
 268 }
 269 module_init(pata_platform_init);
 270 module_exit(pata_platform_exit);
 271
 272 module_param(pio_mask, int, 0);
 273
 274 MODULE_AUTHOR("Paul Mundt");
 275 MODULE_DESCRIPTION("low-level driver for platform device ATA");
 276 MODULE_LICENSE("GPL");
 277 MODULE_VERSION(DRV_VERSION);
 278 MODULE_ALIAS("platform:" DRV_NAME);