drivers/ata/pata_platform.c

   1 /*
   2  * Generic platform device PATA driver
   3  *
   4  * Copyright (C) 2006  Paul Mundt
   5  *
   6  * Based on pata_pcmcia:
   7  *
   8  *   Copyright 2005-2006 Red Hat Inc <alan@redhat.com>, 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/pata_platform.h>
  23
  24 #define DRV_NAME "pata_platform"
  25 #define DRV_VERSION "0.1.2"
  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 void pata_platform_set_mode(struct ata_port *ap)
  34 {
  35         int i;
  36
  37         for (i = 0; i < ATA_MAX_DEVICES; i++) {
  38                 struct ata_device *dev = &ap->device[i];
  39
  40                 if (ata_dev_enabled(dev)) {
  41                         /* We don't really care */
  42                         dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
  43                         dev->xfer_shift = ATA_SHIFT_PIO;
  44                         dev->flags |= ATA_DFLAG_PIO;
  45                 }
  46         }
  47 }
  48
  49 static void pata_platform_host_stop(struct ata_host *host)
  50 {
  51         int i;
  52
  53         /*
  54          * Unmap the bases for MMIO
  55          */
  56         for (i = 0; i < host->n_ports; i++) {
  57                 struct ata_port *ap = host->ports[i];
  58
  59                 if (ap->flags & ATA_FLAG_MMIO) {
  60                         iounmap((void __iomem *)ap->ioaddr.ctl_addr);
  61                         iounmap((void __iomem *)ap->ioaddr.cmd_addr);
  62                 }
  63         }
  64 }
  65
  66 static struct scsi_host_template pata_platform_sht = {
  67         .module                 = THIS_MODULE,
  68         .name                   = DRV_NAME,
  69         .ioctl                  = ata_scsi_ioctl,
  70         .queuecommand           = ata_scsi_queuecmd,
  71         .can_queue              = ATA_DEF_QUEUE,
  72         .this_id                = ATA_SHT_THIS_ID,
  73         .sg_tablesize           = LIBATA_MAX_PRD,
  74         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
  75         .emulated               = ATA_SHT_EMULATED,
  76         .use_clustering         = ATA_SHT_USE_CLUSTERING,
  77         .proc_name              = DRV_NAME,
  78         .dma_boundary           = ATA_DMA_BOUNDARY,
  79         .slave_configure        = ata_scsi_slave_config,
  80         .slave_destroy          = ata_scsi_slave_destroy,
  81         .bios_param             = ata_std_bios_param,
  82 };
  83
  84 static struct ata_port_operations pata_platform_port_ops = {
  85         .set_mode               = pata_platform_set_mode,
  86
  87         .port_disable           = ata_port_disable,
  88         .tf_load                = ata_tf_load,
  89         .tf_read                = ata_tf_read,
  90         .check_status           = ata_check_status,
  91         .exec_command           = ata_exec_command,
  92         .dev_select             = ata_std_dev_select,
  93
  94         .freeze                 = ata_bmdma_freeze,
  95         .thaw                   = ata_bmdma_thaw,
  96         .error_handler          = ata_bmdma_error_handler,
  97         .post_internal_cmd      = ata_bmdma_post_internal_cmd,
  98
  99         .qc_prep                = ata_qc_prep,
 100         .qc_issue               = ata_qc_issue_prot,
 101
 102         .data_xfer              = ata_pio_data_xfer_noirq,
 103
 104         .irq_handler            = ata_interrupt,
 105         .irq_clear              = ata_bmdma_irq_clear,
 106
 107         .port_start             = ata_port_start,
 108         .port_stop              = ata_port_stop,
 109         .host_stop              = pata_platform_host_stop
 110 };
 111
 112 static void pata_platform_setup_port(struct ata_ioports *ioaddr,
 113                                      struct pata_platform_info *info)
 114 {
 115         unsigned int shift = 0;
 116
 117         /* Fixup the port shift for platforms that need it */
 118         if (info && info->ioport_shift)
 119                 shift = info->ioport_shift;
 120
 121         ioaddr->data_addr       = ioaddr->cmd_addr + (ATA_REG_DATA    << shift);
 122         ioaddr->error_addr      = ioaddr->cmd_addr + (ATA_REG_ERR     << shift);
 123         ioaddr->feature_addr    = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift);
 124         ioaddr->nsect_addr      = ioaddr->cmd_addr + (ATA_REG_NSECT   << shift);
 125         ioaddr->lbal_addr       = ioaddr->cmd_addr + (ATA_REG_LBAL    << shift);
 126         ioaddr->lbam_addr       = ioaddr->cmd_addr + (ATA_REG_LBAM    << shift);
 127         ioaddr->lbah_addr       = ioaddr->cmd_addr + (ATA_REG_LBAH    << shift);
 128         ioaddr->device_addr     = ioaddr->cmd_addr + (ATA_REG_DEVICE  << shift);
 129         ioaddr->status_addr     = ioaddr->cmd_addr + (ATA_REG_STATUS  << shift);
 130         ioaddr->command_addr    = ioaddr->cmd_addr + (ATA_REG_CMD     << shift);
 131 }
 132
 133 /**
 134  *      pata_platform_probe             -       attach a platform interface
 135  *      @pdev: platform device
 136  *
 137  *      Register a platform bus IDE interface. Such interfaces are PIO and we
 138  *      assume do not support IRQ sharing.
 139  *
 140  *      Platform devices are expected to contain 3 resources per port:
 141  *
 142  *              - I/O Base (IORESOURCE_IO or IORESOURCE_MEM)
 143  *              - CTL Base (IORESOURCE_IO or IORESOURCE_MEM)
 144  *              - IRQ      (IORESOURCE_IRQ)
 145  *
 146  *      If the base resources are both mem types, the ioremap() is handled
 147  *      here. For IORESOURCE_IO, it's assumed that there's no remapping
 148  *      necessary.
 149  */
 150 static int __devinit pata_platform_probe(struct platform_device *pdev)
 151 {
 152         struct resource *io_res, *ctl_res;
 153         struct ata_probe_ent ae;
 154         unsigned int mmio;
 155         int ret;
 156
 157         /*
 158          * Simple resource validation ..
 159          */
 160         if (unlikely(pdev->num_resources != 3)) {
 161                 dev_err(&pdev->dev, "invalid number of resources\n");
 162                 return -EINVAL;
 163         }
 164
 165         /*
 166          * Get the I/O base first
 167          */
 168         io_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 169         if (io_res == NULL) {
 170                 io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 171                 if (unlikely(io_res == NULL))
 172                         return -EINVAL;
 173         }
 174
 175         /*
 176          * Then the CTL base
 177          */
 178         ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);
 179         if (ctl_res == NULL) {
 180                 ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 181                 if (unlikely(ctl_res == NULL))
 182                         return -EINVAL;
 183         }
 184
 185         /*
 186          * Check for MMIO
 187          */
 188         mmio = (( io_res->flags == IORESOURCE_MEM) &&
 189                 (ctl_res->flags == IORESOURCE_MEM));
 190
 191         /*
 192          * Now that that's out of the way, wire up the port..
 193          */
 194         memset(&ae, 0, sizeof(struct ata_probe_ent));
 195         INIT_LIST_HEAD(&ae.node);
 196         ae.dev = &pdev->dev;
 197         ae.port_ops = &pata_platform_port_ops;
 198         ae.sht = &pata_platform_sht;
 199         ae.n_ports = 1;
 200         ae.pio_mask = pio_mask;
 201         ae.irq = platform_get_irq(pdev, 0);
 202         ae.irq_flags = 0;
 203         ae.port_flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST;
 204
 205         /*
 206          * Handle the MMIO case
 207          */
 208         if (mmio) {
 209                 ae.port_flags |= ATA_FLAG_MMIO;
 210
 211                 ae.port[0].cmd_addr = (unsigned long)ioremap(io_res->start,
 212                                 io_res->end - io_res->start + 1);
 213                 if (unlikely(!ae.port[0].cmd_addr)) {
 214                         dev_err(&pdev->dev, "failed to remap IO base\n");
 215                         return -ENXIO;
 216                 }
 217
 218                 ae.port[0].ctl_addr = (unsigned long)ioremap(ctl_res->start,
 219                                 ctl_res->end - ctl_res->start + 1);
 220                 if (unlikely(!ae.port[0].ctl_addr)) {
 221                         dev_err(&pdev->dev, "failed to remap CTL base\n");
 222                         ret = -ENXIO;
 223                         goto bad_remap;
 224                 }
 225         } else {
 226                 ae.port[0].cmd_addr = io_res->start;
 227                 ae.port[0].ctl_addr = ctl_res->start;
 228         }
 229
 230         ae.port[0].altstatus_addr = ae.port[0].ctl_addr;
 231
 232         pata_platform_setup_port(&ae.port[0], pdev->dev.platform_data);
 233
 234         if (unlikely(ata_device_add(&ae) == 0)) {
 235                 ret = -ENODEV;
 236                 goto add_failed;
 237         }
 238
 239         return 0;
 240
 241 add_failed:
 242         if (ae.port[0].ctl_addr && mmio)
 243                 iounmap((void __iomem *)ae.port[0].ctl_addr);
 244 bad_remap:
 245         if (ae.port[0].cmd_addr && mmio)
 246                 iounmap((void __iomem *)ae.port[0].cmd_addr);
 247
 248         return ret;
 249 }
 250
 251 /**
 252  *      pata_platform_remove    -       unplug a platform interface
 253  *      @pdev: platform device
 254  *
 255  *      A platform bus ATA device has been unplugged. Perform the needed
 256  *      cleanup. Also called on module unload for any active devices.
 257  */
 258 static int __devexit pata_platform_remove(struct platform_device *pdev)
 259 {
 260         struct device *dev = &pdev->dev;
 261         struct ata_host *host = dev_get_drvdata(dev);
 262
 263         ata_host_remove(host);
 264         dev_set_drvdata(dev, NULL);
 265
 266         return 0;
 267 }
 268
 269 static struct platform_driver pata_platform_driver = {
 270         .probe          = pata_platform_probe,
 271         .remove         = __devexit_p(pata_platform_remove),
 272         .driver = {
 273                 .name           = DRV_NAME,
 274                 .owner          = THIS_MODULE,
 275         },
 276 };
 277
 278 static int __init pata_platform_init(void)
 279 {
 280         return platform_driver_register(&pata_platform_driver);
 281 }
 282
 283 static void __exit pata_platform_exit(void)
 284 {
 285         platform_driver_unregister(&pata_platform_driver);
 286 }
 287 module_init(pata_platform_init);
 288 module_exit(pata_platform_exit);
 289
 290 module_param(pio_mask, int, 0);
 291
 292 MODULE_AUTHOR("Paul Mundt");
 293 MODULE_DESCRIPTION("low-level driver for platform device ATA");
 294 MODULE_LICENSE("GPL");
 295 MODULE_VERSION(DRV_VERSION);