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        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
  80static const struct of_device_id pata_of_platform_match[] = {
  81        { .compatible = "ata-generic", },
  82        { },
  83};
  84MODULE_DEVICE_TABLE(of, pata_of_platform_match);
  85
  86static 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
  95module_platform_driver(pata_of_platform_driver);
  96
  97MODULE_DESCRIPTION("OF-platform PATA driver");
  98MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
  99MODULE_LICENSE("GPL");
 100