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/blkdev.h>
  17 #include <scsi/scsi_host.h>
  18 #include <linux/ata.h>
  19 #include <linux/libata.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/ata_platform.h>
  22
  23 #define DRV_NAME "pata_platform"
  24 #define DRV_VERSION "1.2"
  25
  26 static int pio_mask = 1;
  27
  28 /*
  29  * Provide our own set_mode() as we don't want to change anything that has
  30  * already been configured..
  31  */
  32 static int pata_platform_set_mode(struct ata_link *link, struct ata_device **unused)
  33 {
  34         struct ata_device *dev;
  35
  36         ata_for_each_dev(dev, link, ENABLED) {
  37                 /* We don't really care */
  38                 dev->pio_mode = dev->xfer_mode = XFER_PIO_0;
  39                 dev->xfer_shift = ATA_SHIFT_PIO;
  40                 dev->flags |= ATA_DFLAG_PIO;
  41                 ata_dev_info(dev, "configured for PIO\n");
  42         }
  43         return 0;
  44 }
  45
  46 static struct scsi_host_template pata_platform_sht = {
  47         ATA_PIO_SHT(DRV_NAME),
  48 };
  49
  50 static void pata_platform_setup_port(struct ata_ioports *ioaddr,
  51                                      unsigned int shift)
  52 {
  53         /* Fixup the port shift for platforms that need it */
  54         ioaddr->data_addr       = ioaddr->cmd_addr + (ATA_REG_DATA    << shift);
  55         ioaddr->error_addr      = ioaddr->cmd_addr + (ATA_REG_ERR     << shift);
  56         ioaddr->feature_addr    = ioaddr->cmd_addr + (ATA_REG_FEATURE << shift);
  57         ioaddr->nsect_addr      = ioaddr->cmd_addr + (ATA_REG_NSECT   << shift);
  58         ioaddr->lbal_addr       = ioaddr->cmd_addr + (ATA_REG_LBAL    << shift);
  59         ioaddr->lbam_addr       = ioaddr->cmd_addr + (ATA_REG_LBAM    << shift);
  60         ioaddr->lbah_addr       = ioaddr->cmd_addr + (ATA_REG_LBAH    << shift);
  61         ioaddr->device_addr     = ioaddr->cmd_addr + (ATA_REG_DEVICE  << shift);
  62         ioaddr->status_addr     = ioaddr->cmd_addr + (ATA_REG_STATUS  << shift);
  63         ioaddr->command_addr    = ioaddr->cmd_addr + (ATA_REG_CMD     << shift);
  64 }
  65
  66 /**
  67  *      __pata_platform_probe           -       attach a platform interface
  68  *      @dev: device
  69  *      @io_res: Resource representing I/O base
  70  *      @ctl_res: Resource representing CTL base
  71  *      @irq_res: Resource representing IRQ and its flags
  72  *      @ioport_shift: I/O port shift
  73  *      @__pio_mask: PIO mask
  74  *      @sht: scsi_host_template to use when registering
  75  *      @use16bit: Flag to indicate 16-bit IO instead of 32-bit
  76  *
  77  *      Register a platform bus IDE interface. Such interfaces are PIO and we
  78  *      assume do not support IRQ sharing.
  79  *
  80  *      Platform devices are expected to contain at least 2 resources per port:
  81  *
  82  *              - I/O Base (IORESOURCE_IO or IORESOURCE_MEM)
  83  *              - CTL Base (IORESOURCE_IO or IORESOURCE_MEM)
  84  *
  85  *      and optionally:
  86  *
  87  *              - IRQ      (IORESOURCE_IRQ)
  88  *
  89  *      If the base resources are both mem types, the ioremap() is handled
  90  *      here. For IORESOURCE_IO, it's assumed that there's no remapping
  91  *      necessary.
  92  *
  93  *      If no IRQ resource is present, PIO polling mode is used instead.
  94  */
  95 int __pata_platform_probe(struct device *dev, struct resource *io_res,
  96                           struct resource *ctl_res, struct resource *irq_res,
  97                           unsigned int ioport_shift, int __pio_mask,
  98                           struct scsi_host_template *sht, bool use16bit)
  99 {
 100         struct ata_host *host;
 101         struct ata_port *ap;
 102         unsigned int mmio;
 103         int irq = 0;
 104         int irq_flags = 0;
 105
 106         /*
 107          * Check for MMIO
 108          */
 109         mmio = (( io_res->flags == IORESOURCE_MEM) &&
 110                 (ctl_res->flags == IORESOURCE_MEM));
 111
 112         /*
 113          * And the IRQ
 114          */
 115         if (irq_res && irq_res->start > 0) {
 116                 irq = irq_res->start;
 117                 irq_flags = (irq_res->flags & IRQF_TRIGGER_MASK) | IRQF_SHARED;
 118         }
 119
 120         /*
 121          * Now that that's out of the way, wire up the port..
 122          */
 123         host = ata_host_alloc(dev, 1);
 124         if (!host)
 125                 return -ENOMEM;
 126         ap = host->ports[0];
 127
 128         ap->ops = devm_kzalloc(dev, sizeof(*ap->ops), GFP_KERNEL);
 129         ap->ops->inherits = &ata_sff_port_ops;
 130         ap->ops->cable_detect = ata_cable_unknown;
 131         ap->ops->set_mode = pata_platform_set_mode;
 132         if (use16bit)
 133                 ap->ops->sff_data_xfer = ata_sff_data_xfer;
 134         else
 135                 ap->ops->sff_data_xfer = ata_sff_data_xfer32;
 136
 137         ap->pio_mask = __pio_mask;
 138         ap->flags |= ATA_FLAG_SLAVE_POSS;
 139
 140         /*
 141          * Use polling mode if there's no IRQ
 142          */
 143         if (!irq) {
 144                 ap->flags |= ATA_FLAG_PIO_POLLING;
 145                 ata_port_desc(ap, "no IRQ, using PIO polling");
 146         }
 147
 148         /*
 149          * Handle the MMIO case
 150          */
 151         if (mmio) {
 152                 ap->ioaddr.cmd_addr = devm_ioremap(dev, io_res->start,
 153                                 resource_size(io_res));
 154                 ap->ioaddr.ctl_addr = devm_ioremap(dev, ctl_res->start,
 155                                 resource_size(ctl_res));
 156         } else {
 157                 ap->ioaddr.cmd_addr = devm_ioport_map(dev, io_res->start,
 158                                 resource_size(io_res));
 159                 ap->ioaddr.ctl_addr = devm_ioport_map(dev, ctl_res->start,
 160                                 resource_size(ctl_res));
 161         }
 162         if (!ap->ioaddr.cmd_addr || !ap->ioaddr.ctl_addr) {
 163                 dev_err(dev, "failed to map IO/CTL base\n");
 164                 return -ENOMEM;
 165         }
 166
 167         ap->ioaddr.altstatus_addr = ap->ioaddr.ctl_addr;
 168
 169         pata_platform_setup_port(&ap->ioaddr, ioport_shift);
 170
 171         ata_port_desc(ap, "%s cmd 0x%llx ctl 0x%llx", mmio ? "mmio" : "ioport",
 172                       (unsigned long long)io_res->start,
 173                       (unsigned long long)ctl_res->start);
 174
 175         /* activate */
 176         return ata_host_activate(host, irq, irq ? ata_sff_interrupt : NULL,
 177                                  irq_flags, sht);
 178 }
 179 EXPORT_SYMBOL_GPL(__pata_platform_probe);
 180
 181 static int pata_platform_probe(struct platform_device *pdev)
 182 {
 183         struct resource *io_res;
 184         struct resource *ctl_res;
 185         struct resource *irq_res;
 186         struct pata_platform_info *pp_info = dev_get_platdata(&pdev->dev);
 187
 188         /*
 189          * Simple resource validation ..
 190          */
 191         if ((pdev->num_resources != 3) && (pdev->num_resources != 2)) {
 192                 dev_err(&pdev->dev, "invalid number of resources\n");
 193                 return -EINVAL;
 194         }
 195
 196         /*
 197          * Get the I/O base first
 198          */
 199         io_res = platform_get_resource(pdev, IORESOURCE_IO, 0);
 200         if (io_res == NULL) {
 201                 io_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 202                 if (unlikely(io_res == NULL))
 203                         return -EINVAL;
 204         }
 205
 206         /*
 207          * Then the CTL base
 208          */
 209         ctl_res = platform_get_resource(pdev, IORESOURCE_IO, 1);
 210         if (ctl_res == NULL) {
 211                 ctl_res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 212                 if (unlikely(ctl_res == NULL))
 213                         return -EINVAL;
 214         }
 215
 216         /*
 217          * And the IRQ
 218          */
 219         irq_res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
 220
 221         return __pata_platform_probe(&pdev->dev, io_res, ctl_res, irq_res,
 222                                      pp_info ? pp_info->ioport_shift : 0,
 223                                      pio_mask, &pata_platform_sht, false);
 224 }
 225
 226 static struct platform_driver pata_platform_driver = {
 227         .probe          = pata_platform_probe,
 228         .remove         = ata_platform_remove_one,
 229         .driver = {
 230                 .name           = DRV_NAME,
 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);