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         const u32 *prop;
  36
  37         ret = of_address_to_resource(dn, 0, &io_res);
  38         if (ret) {
  39                 dev_err(&ofdev->dev, "can't get IO address from "
  40                         "device tree\n");
  41                 return -EINVAL;
  42         }
  43
  44         ret = of_address_to_resource(dn, 1, &ctl_res);
  45         if (ret) {
  46                 dev_err(&ofdev->dev, "can't get CTL address from "
  47                         "device tree\n");
  48                 return -EINVAL;
  49         }
  50
  51         irq_res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0);
  52
  53         prop = of_get_property(dn, "reg-shift", NULL);
  54         if (prop)
  55                 reg_shift = be32_to_cpup(prop);
  56
  57         prop = of_get_property(dn, "pio-mode", NULL);
  58         if (prop) {
  59                 pio_mode = be32_to_cpup(prop);
  60                 if (pio_mode > 6) {
  61                         dev_err(&ofdev->dev, "invalid pio-mode\n");
  62                         return -EINVAL;
  63                 }
  64         } else {
  65                 dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
  66         }
  67
  68         pio_mask = 1 << pio_mode;
  69         pio_mask |= (1 << pio_mode) - 1;
  70
  71         return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq_res,
  72                                      reg_shift, pio_mask, &pata_platform_sht);
  73 }
  74
  75 static struct of_device_id pata_of_platform_match[] = {
  76         { .compatible = "ata-generic", },
  77         { },
  78 };
  79 MODULE_DEVICE_TABLE(of, pata_of_platform_match);
  80
  81 static struct platform_driver pata_of_platform_driver = {
  82         .driver = {
  83                 .name = DRV_NAME,
  84                 .of_match_table = pata_of_platform_match,
  85         },
  86         .probe          = pata_of_platform_probe,
  87         .remove         = ata_platform_remove_one,
  88 };
  89
  90 module_platform_driver(pata_of_platform_driver);
  91
  92 MODULE_DESCRIPTION("OF-platform PATA driver");
  93 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
  94 MODULE_LICENSE("GPL");