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Linux/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 static int pata_of_platform_probe(struct platform_device *ofdev)
 20 {
 21         int ret;
 22         struct device_node *dn = ofdev->dev.of_node;
 23         struct resource io_res;
 24         struct resource ctl_res;
 25         struct resource *irq_res;
 26         unsigned int reg_shift = 0;
 27         int pio_mode = 0;
 28         int pio_mask;
 29         const u32 *prop;
 30 
 31         ret = of_address_to_resource(dn, 0, &io_res);
 32         if (ret) {
 33                 dev_err(&ofdev->dev, "can't get IO address from "
 34                         "device tree\n");
 35                 return -EINVAL;
 36         }
 37 
 38         if (of_device_is_compatible(dn, "electra-ide")) {
 39                 /* Altstatus is really at offset 0x3f6 from the primary window
 40                  * on electra-ide. Adjust ctl_res and io_res accordingly.
 41                  */
 42                 ctl_res = io_res;
 43                 ctl_res.start = ctl_res.start+0x3f6;
 44                 io_res.end = ctl_res.start-1;
 45         } else {
 46                 ret = of_address_to_resource(dn, 1, &ctl_res);
 47                 if (ret) {
 48                         dev_err(&ofdev->dev, "can't get CTL address from "
 49                                 "device tree\n");
 50                         return -EINVAL;
 51                 }
 52         }
 53 
 54         irq_res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0);
 55         if (irq_res)
 56                 irq_res->flags = 0;
 57 
 58         prop = of_get_property(dn, "reg-shift", NULL);
 59         if (prop)
 60                 reg_shift = be32_to_cpup(prop);
 61 
 62         prop = of_get_property(dn, "pio-mode", NULL);
 63         if (prop) {
 64                 pio_mode = be32_to_cpup(prop);
 65                 if (pio_mode > 6) {
 66                         dev_err(&ofdev->dev, "invalid pio-mode\n");
 67                         return -EINVAL;
 68                 }
 69         } else {
 70                 dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
 71         }
 72 
 73         pio_mask = 1 << pio_mode;
 74         pio_mask |= (1 << pio_mode) - 1;
 75 
 76         return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq_res,
 77                                      reg_shift, pio_mask);
 78 }
 79 
 80 static struct of_device_id pata_of_platform_match[] = {
 81         { .compatible = "ata-generic", },
 82         { .compatible = "electra-ide", },
 83         {},
 84 };
 85 MODULE_DEVICE_TABLE(of, pata_of_platform_match);
 86 
 87 static struct platform_driver pata_of_platform_driver = {
 88         .driver = {
 89                 .name = "pata_of_platform",
 90                 .owner = THIS_MODULE,
 91                 .of_match_table = pata_of_platform_match,
 92         },
 93         .probe          = pata_of_platform_probe,
 94         .remove         = ata_platform_remove_one,
 95 };
 96 
 97 module_platform_driver(pata_of_platform_driver);
 98 
 99 MODULE_DESCRIPTION("OF-platform PATA driver");
100 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
101 MODULE_LICENSE("GPL");
102 

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