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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 #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");
 95 

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