LXR linux/drivers/ata/pata

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * drivers/ata/pata_palmld.c
   4 *
   5 * Driver for IDE channel in Palm LifeDrive
   6 *
   7 * Based on research of:
   8 *              Alex Osborne <ato@meshy.org>
   9 *
  10 * Rewrite for mainline:
  11 *              Marek Vasut <marek.vasut@gmail.com>
  12 *
  13 * Rewritten version based on pata_ixp4xx_cf.c:
  14 * ixp4xx PATA/Compact Flash driver
  15 * Copyright (C) 2006-07 Tower Technologies
  16 * Author: Alessandro Zummo <a.zummo@towertech.it>
  17 */
  18
  19#include <linux/kernel.h>
  20#include <linux/module.h>
  21#include <linux/libata.h>
  22#include <linux/irq.h>
  23#include <linux/platform_device.h>
  24#include <linux/delay.h>
  25#include <linux/gpio/consumer.h>
  26
  27#include <scsi/scsi_host.h>
  28#include <mach/palmld.h>
  29
  30#define DRV_NAME "pata_palmld"
  31
  32struct palmld_pata {
  33        struct ata_host *host;
  34        struct gpio_desc *power;
  35        struct gpio_desc *reset;
  36};
  37
  38static struct scsi_host_template palmld_sht = {
  39        ATA_PIO_SHT(DRV_NAME),
  40};
  41
  42static struct ata_port_operations palmld_port_ops = {
  43        .inherits               = &ata_sff_port_ops,
  44        .sff_data_xfer          = ata_sff_data_xfer32,
  45        .cable_detect           = ata_cable_40wire,
  46};
  47
  48static int palmld_pata_probe(struct platform_device *pdev)
  49{
  50        struct palmld_pata *lda;
  51        struct ata_port *ap;
  52        void __iomem *mem;
  53        struct device *dev = &pdev->dev;
  54        int ret;
  55
  56        lda = devm_kzalloc(dev, sizeof(*lda), GFP_KERNEL);
  57        if (!lda)
  58                return -ENOMEM;
  59
  60        /* allocate host */
  61        lda->host = ata_host_alloc(dev, 1);
  62        if (!lda->host)
  63                return -ENOMEM;
  64
  65        /* remap drive's physical memory address */
  66        mem = devm_ioremap(dev, PALMLD_IDE_PHYS, 0x1000);
  67        if (!mem)
  68                return -ENOMEM;
  69
  70        /* request and activate power and reset GPIOs */
  71        lda->power = devm_gpiod_get(dev, "power", GPIOD_OUT_HIGH);
  72        if (IS_ERR(lda->power))
  73                return PTR_ERR(lda->power);
  74        lda->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
  75        if (IS_ERR(lda->reset)) {
  76                gpiod_set_value(lda->power, 0);
  77                return PTR_ERR(lda->reset);
  78        }
  79
  80        /* Assert reset to reset the drive */
  81        gpiod_set_value(lda->reset, 1);
  82        msleep(30);
  83        gpiod_set_value(lda->reset, 0);
  84        msleep(30);
  85
  86        /* setup the ata port */
  87        ap = lda->host->ports[0];
  88        ap->ops = &palmld_port_ops;
  89        ap->pio_mask = ATA_PIO4;
  90        ap->flags |= ATA_FLAG_PIO_POLLING;
  91
  92        /* memory mapping voodoo */
  93        ap->ioaddr.cmd_addr = mem + 0x10;
  94        ap->ioaddr.altstatus_addr = mem + 0xe;
  95        ap->ioaddr.ctl_addr = mem + 0xe;
  96
  97        /* start the port */
  98        ata_sff_std_ports(&ap->ioaddr);
  99
 100        /* activate host */
 101        ret = ata_host_activate(lda->host, 0, NULL, IRQF_TRIGGER_RISING,
 102                                &palmld_sht);
 103        /* power down on failure */
 104        if (ret) {
 105                gpiod_set_value(lda->power, 0);
 106                return ret;
 107        }
 108
 109        platform_set_drvdata(pdev, lda);
 110        return 0;
 111}
 112
 113static int palmld_pata_remove(struct platform_device *pdev)
 114{
 115        struct palmld_pata *lda = platform_get_drvdata(pdev);
 116
 117        ata_platform_remove_one(pdev);
 118
 119        /* power down the HDD */
 120        gpiod_set_value(lda->power, 0);
 121
 122        return 0;
 123}
 124
 125static struct platform_driver palmld_pata_platform_driver = {
 126        .driver  = {
 127                .name   = DRV_NAME,
 128        },
 129        .probe          = palmld_pata_probe,
 130        .remove         = palmld_pata_remove,
 131};
 132
 133module_platform_driver(palmld_pata_platform_driver);
 134
 135MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
 136MODULE_DESCRIPTION("PalmLD PATA driver");
 137MODULE_LICENSE("GPL");
 138MODULE_ALIAS("platform:" DRV_NAME);
 139