LXR linux/drivers/ata/pata_of

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * OF-platform PATA driver
   4 *
   5 * Copyright (c) 2007  MontaVista Software, Inc.
   6 *                     Anton Vorontsov <avorontsov@ru.mvista.com>
   7 */
   8
   9#include <linux/kernel.h>
  10#include <linux/module.h>
  11#include <linux/of_address.h>
  12#include <linux/platform_device.h>
  13#include <linux/ata_platform.h>
  14#include <linux/libata.h>
  15
  16#define DRV_NAME "pata_of_platform"
  17
  18static struct scsi_host_template pata_platform_sht = {
  19        ATA_PIO_SHT(DRV_NAME),
  20};
  21
  22static int pata_of_platform_probe(struct platform_device *ofdev)
  23{
  24        int ret;
  25        struct device_node *dn = ofdev->dev.of_node;
  26        struct resource io_res;
  27        struct resource ctl_res;
  28        struct resource *irq_res;
  29        unsigned int reg_shift = 0;
  30        int pio_mode = 0;
  31        int pio_mask;
  32        bool use16bit;
  33
  34        ret = of_address_to_resource(dn, 0, &io_res);
  35        if (ret) {
  36                dev_err(&ofdev->dev, "can't get IO address from "
  37                        "device tree\n");
  38                return -EINVAL;
  39        }
  40
  41        ret = of_address_to_resource(dn, 1, &ctl_res);
  42        if (ret) {
  43                dev_err(&ofdev->dev, "can't get CTL address from "
  44                        "device tree\n");
  45                return -EINVAL;
  46        }
  47
  48        irq_res = platform_get_resource(ofdev, IORESOURCE_IRQ, 0);
  49
  50        of_property_read_u32(dn, "reg-shift", &reg_shift);
  51
  52        if (!of_property_read_u32(dn, "pio-mode", &pio_mode)) {
  53                if (pio_mode > 6) {
  54                        dev_err(&ofdev->dev, "invalid pio-mode\n");
  55                        return -EINVAL;
  56                }
  57        } else {
  58                dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
  59        }
  60
  61        use16bit = of_property_read_bool(dn, "ata-generic,use16bit");
  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                                     use16bit);
  69}
  70
  71static const struct of_device_id pata_of_platform_match[] = {
  72        { .compatible = "ata-generic", },
  73        { },
  74};
  75MODULE_DEVICE_TABLE(of, pata_of_platform_match);
  76
  77static struct platform_driver pata_of_platform_driver = {
  78        .driver = {
  79                .name = DRV_NAME,
  80                .of_match_table = pata_of_platform_match,
  81        },
  82        .probe          = pata_of_platform_probe,
  83        .remove         = ata_platform_remove_one,
  84};
  85
  86module_platform_driver(pata_of_platform_driver);
  87
  88MODULE_DESCRIPTION("OF-platform PATA driver");
  89MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
  90MODULE_LICENSE("GPL");
  91