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