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