drivers/ata/pata_of_platform.c

   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
  18 static struct scsi_host_template pata_platform_sht = {
  19         ATA_PIO_SHT(DRV_NAME),
  20 };
  21
  22 static 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
  71 static const struct of_device_id pata_of_platform_match[] = {
  72         { .compatible = "ata-generic", },
  73         { },
  74 };
  75 MODULE_DEVICE_TABLE(of, pata_of_platform_match);
  76
  77 static 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
  86 module_platform_driver(pata_of_platform_driver);
  87
  88 MODULE_DESCRIPTION("OF-platform PATA driver");
  89 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
  90 MODULE_LICENSE("GPL");