drivers/ata/pata_of_platform.c

   1 /*
   2  * OF-platform PATA driver
   3  *
   4  * Copyright (c) 2007  MontaVista Software, Inc.
   5  *                     Anton Vorontsov <avorontsov@ru.mvista.com>
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License (Version 2) as
   9  * published by the Free Software Foundation.
  10  */
  11
  12 #include <linux/kernel.h>
  13 #include <linux/module.h>
  14 #include <linux/of_address.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/ata_platform.h>
  17 #include <linux/libata.h>
  18
  19 #define DRV_NAME "pata_of_platform"
  20
  21 static struct scsi_host_template pata_platform_sht = {
  22         ATA_PIO_SHT(DRV_NAME),
  23 };
  24
  25 static int pata_of_platform_probe(struct platform_device *ofdev)
  26 {
  27         int ret;
  28         struct device_node *dn = ofdev->dev.of_node;
  29         struct resource io_res;
  30         struct resource ctl_res;
  31         struct resource *irq_res;
  32         unsigned int reg_shift = 0;
  33         int pio_mode = 0;
  34         int pio_mask;
  35
  36         ret = of_address_to_resource(dn, 0, &io_res);
  37         if (ret) {
  38                 dev_err(&ofdev->dev, "can't get IO address from "
  39                         "device tree\n");
  40                 return -EINVAL;
  41         }
  42
  43         ret = of_address_to_resource(dn, 1, &ctl_res);
  44         if (ret) {
  45                 dev_err(&ofdev->dev, "can't get CTL address from "
  46                         "device tree\n");
  47                 return -EINVAL;
  48         }
  49
  50         irq_res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0);
  51
  52         of_property_read_u32(dn, "reg-shift", &reg_shift);
  53
  54         if (!of_property_read_u32(dn, "pio-mode", &pio_mode)) {
  55                 if (pio_mode > 6) {
  56                         dev_err(&ofdev->dev, "invalid pio-mode\n");
  57                         return -EINVAL;
  58                 }
  59         } else {
  60                 dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
  61         }
  62
  63         pio_mask = 1 << pio_mode;
  64         pio_mask |= (1 << pio_mode) - 1;
  65
  66         return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq_res,
  67                                      reg_shift, pio_mask, &pata_platform_sht);
  68 }
  69
  70 static const struct of_device_id pata_of_platform_match[] = {
  71         { .compatible = "ata-generic", },
  72         { },
  73 };
  74 MODULE_DEVICE_TABLE(of, pata_of_platform_match);
  75
  76 static struct platform_driver pata_of_platform_driver = {
  77         .driver = {
  78                 .name = DRV_NAME,
  79                 .of_match_table = pata_of_platform_match,
  80         },
  81         .probe          = pata_of_platform_probe,
  82         .remove         = ata_platform_remove_one,
  83 };
  84
  85 module_platform_driver(pata_of_platform_driver);
  86
  87 MODULE_DESCRIPTION("OF-platform PATA driver");
  88 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
  89 MODULE_LICENSE("GPL");