drivers/ata/pata_palmld.c

   1 /*
   2  * drivers/ata/pata_palmld.c
   3  *
   4  * Driver for IDE channel in Palm LifeDrive
   5  *
   6  * Based on research of:
   7  *              Alex Osborne <ato@meshy.org>
   8  *
   9  * Rewrite for mainline:
  10  *              Marek Vasut <marek.vasut@gmail.com>
  11  *
  12  * Rewritten version based on pata_ixp4xx_cf.c:
  13  * ixp4xx PATA/Compact Flash driver
  14  * Copyright (C) 2006-07 Tower Technologies
  15  * Author: Alessandro Zummo <a.zummo@towertech.it>
  16  *
  17  * This program is free software; you can redistribute it and/or modify
  18  * it under the terms of the GNU General Public License version 2 as
  19  * published by the Free Software Foundation.
  20  *
  21  */
  22
  23 #include <linux/kernel.h>
  24 #include <linux/module.h>
  25 #include <linux/libata.h>
  26 #include <linux/irq.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/delay.h>
  29 #include <linux/gpio.h>
  30
  31 #include <scsi/scsi_host.h>
  32 #include <mach/palmld.h>
  33
  34 #define DRV_NAME "pata_palmld"
  35
  36 static struct gpio palmld_hdd_gpios[] = {
  37         { GPIO_NR_PALMLD_IDE_PWEN,      GPIOF_INIT_HIGH,        "HDD Power" },
  38         { GPIO_NR_PALMLD_IDE_RESET,     GPIOF_INIT_LOW,         "HDD Reset" },
  39 };
  40
  41 static struct scsi_host_template palmld_sht = {
  42         ATA_PIO_SHT(DRV_NAME),
  43 };
  44
  45 static struct ata_port_operations palmld_port_ops = {
  46         .inherits               = &ata_sff_port_ops,
  47         .sff_data_xfer          = ata_sff_data_xfer32,
  48         .cable_detect           = ata_cable_40wire,
  49 };
  50
  51 static int palmld_pata_probe(struct platform_device *pdev)
  52 {
  53         struct ata_host *host;
  54         struct ata_port *ap;
  55         void __iomem *mem;
  56         int ret;
  57
  58         /* allocate host */
  59         host = ata_host_alloc(&pdev->dev, 1);
  60         if (!host) {
  61                 ret = -ENOMEM;
  62                 goto err1;
  63         }
  64
  65         /* remap drive's physical memory address */
  66         mem = devm_ioremap(&pdev->dev, PALMLD_IDE_PHYS, 0x1000);
  67         if (!mem) {
  68                 ret = -ENOMEM;
  69                 goto err1;
  70         }
  71
  72         /* request and activate power GPIO, IRQ GPIO */
  73         ret = gpio_request_array(palmld_hdd_gpios,
  74                                 ARRAY_SIZE(palmld_hdd_gpios));
  75         if (ret)
  76                 goto err1;
  77
  78         /* reset the drive */
  79         gpio_set_value(GPIO_NR_PALMLD_IDE_RESET, 0);
  80         msleep(30);
  81         gpio_set_value(GPIO_NR_PALMLD_IDE_RESET, 1);
  82         msleep(30);
  83
  84         /* setup the ata port */
  85         ap = host->ports[0];
  86         ap->ops = &palmld_port_ops;
  87         ap->pio_mask = ATA_PIO4;
  88         ap->flags |= ATA_FLAG_PIO_POLLING;
  89
  90         /* memory mapping voodoo */
  91         ap->ioaddr.cmd_addr = mem + 0x10;
  92         ap->ioaddr.altstatus_addr = mem + 0xe;
  93         ap->ioaddr.ctl_addr = mem + 0xe;
  94
  95         /* start the port */
  96         ata_sff_std_ports(&ap->ioaddr);
  97
  98         /* activate host */
  99         ret = ata_host_activate(host, 0, NULL, IRQF_TRIGGER_RISING,
 100                                         &palmld_sht);
 101         if (ret)
 102                 goto err2;
 103
 104         return ret;
 105
 106 err2:
 107         gpio_free_array(palmld_hdd_gpios, ARRAY_SIZE(palmld_hdd_gpios));
 108 err1:
 109         return ret;
 110 }
 111
 112 static int palmld_pata_remove(struct platform_device *dev)
 113 {
 114         ata_platform_remove_one(dev);
 115
 116         /* power down the HDD */
 117         gpio_set_value(GPIO_NR_PALMLD_IDE_PWEN, 0);
 118
 119         gpio_free_array(palmld_hdd_gpios, ARRAY_SIZE(palmld_hdd_gpios));
 120
 121         return 0;
 122 }
 123
 124 static struct platform_driver palmld_pata_platform_driver = {
 125         .driver  = {
 126                 .name   = DRV_NAME,
 127         },
 128         .probe          = palmld_pata_probe,
 129         .remove         = palmld_pata_remove,
 130 };
 131
 132 module_platform_driver(palmld_pata_platform_driver);
 133
 134 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
 135 MODULE_DESCRIPTION("PalmLD PATA driver");
 136 MODULE_LICENSE("GPL");
 137 MODULE_ALIAS("platform:" DRV_NAME);