Eric Lee / smarc-fsl-linux-kernel

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drivers/ata/pata_of_platform.c 2.24 KB
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81f7e3824   Eric Lee   Initial Release, ... 
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  /*
   * OF-platform PATA driver
   *
   * Copyright (c) 2007  MontaVista Software, Inc.
   *                     Anton Vorontsov <avorontsov@ru.mvista.com>
   *
   * This program is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License (Version 2) as
   * published by the Free Software Foundation.
   */
  
  #include <linux/kernel.h>
  #include <linux/module.h>
  #include <linux/of_address.h>
  #include <linux/platform_device.h>
  #include <linux/ata_platform.h>
  #include <linux/libata.h>
  
  #define DRV_NAME "pata_of_platform"
  
  static struct scsi_host_template pata_platform_sht = {
  	ATA_PIO_SHT(DRV_NAME),
  };
  
  static int pata_of_platform_probe(struct platform_device *ofdev)
  {
  	int ret;
  	struct device_node *dn = ofdev->dev.of_node;
  	struct resource io_res;
  	struct resource ctl_res;
  	struct resource *irq_res;
  	unsigned int reg_shift = 0;
  	int pio_mode = 0;
  	int pio_mask;
  
  	ret = of_address_to_resource(dn, 0, &io_res);
  	if (ret) {
  		dev_err(&ofdev->dev, "can't get IO address from "
  			"device tree
  ");
  		return -EINVAL;
  	}
  
  	ret = of_address_to_resource(dn, 1, &ctl_res);
  	if (ret) {
  		dev_err(&ofdev->dev, "can't get CTL address from "
  			"device tree
  ");
  		return -EINVAL;
  	}
  
  	irq_res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0);
  
  	of_property_read_u32(dn, "reg-shift", &reg_shift);
  
  	if (!of_property_read_u32(dn, "pio-mode", &pio_mode)) {
  		if (pio_mode > 6) {
  			dev_err(&ofdev->dev, "invalid pio-mode
  ");
  			return -EINVAL;
  		}
  	} else {
  		dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0
  ");
  	}
  
  	pio_mask = 1 << pio_mode;
  	pio_mask |= (1 << pio_mode) - 1;
  
  	return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq_res,
  				     reg_shift, pio_mask, &pata_platform_sht);
  }
  
  static const struct of_device_id pata_of_platform_match[] = {
  	{ .compatible = "ata-generic", },
  	{ },
  };
  MODULE_DEVICE_TABLE(of, pata_of_platform_match);
  
  static struct platform_driver pata_of_platform_driver = {
  	.driver = {
  		.name = DRV_NAME,
  		.of_match_table = pata_of_platform_match,
  	},
  	.probe		= pata_of_platform_probe,
  	.remove		= ata_platform_remove_one,
  };
  
  module_platform_driver(pata_of_platform_driver);
  
  MODULE_DESCRIPTION("OF-platform PATA driver");
  MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
  MODULE_LICENSE("GPL");