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 const 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         int irq;
  34
  35         ret = of_address_to_resource(dn, 0, &io_res);
  36         if (ret) {
  37                 dev_err(&ofdev->dev, "can't get IO address from "
  38                         "device tree\n");
  39                 return -EINVAL;
  40         }
  41
  42         ret = of_address_to_resource(dn, 1, &ctl_res);
  43         if (ret) {
  44                 dev_err(&ofdev->dev, "can't get CTL address from "
  45                         "device tree\n");
  46                 return -EINVAL;
  47         }
  48
  49         memset(&irq_res, 0, sizeof(irq_res));
  50
  51         irq = platform_get_irq_optional(ofdev, 0);
  52         if (irq < 0 && irq != -ENXIO)
  53                 return irq;
  54         if (irq > 0) {
  55                 irq_res.start = irq;
  56                 irq_res.end = irq;
  57         }
  58
  59         of_property_read_u32(dn, "reg-shift", &reg_shift);
  60
  61         if (!of_property_read_u32(dn, "pio-mode", &pio_mode)) {
  62                 if (pio_mode > 6) {
  63                         dev_err(&ofdev->dev, "invalid pio-mode\n");
  64                         return -EINVAL;
  65                 }
  66         } else {
  67                 dev_info(&ofdev->dev, "pio-mode unspecified, assuming PIO0\n");
  68         }
  69
  70         use16bit = of_property_read_bool(dn, "ata-generic,use16bit");
  71
  72         pio_mask = 1 << pio_mode;
  73         pio_mask |= (1 << pio_mode) - 1;
  74
  75         return __pata_platform_probe(&ofdev->dev, &io_res, &ctl_res, irq > 0 ? &irq_res : NULL,
  76                                      reg_shift, pio_mask, &pata_platform_sht,
  77                                      use16bit);
  78 }
  79
  80 static const struct of_device_id pata_of_platform_match[] = {
  81         { .compatible = "ata-generic", },
  82         { /* sentinel */ }
  83 };
  84 MODULE_DEVICE_TABLE(of, pata_of_platform_match);
  85
  86 static struct platform_driver pata_of_platform_driver = {
  87         .driver = {
  88                 .name = DRV_NAME,
  89                 .of_match_table = pata_of_platform_match,
  90         },
  91         .probe          = pata_of_platform_probe,
  92         .remove         = ata_platform_remove_one,
  93 };
  94
  95 module_platform_driver(pata_of_platform_driver);
  96
  97 MODULE_DESCRIPTION("OF-platform PATA driver");
  98 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
  99 MODULE_LICENSE("GPL");