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/consumer.h>
  30
  31 #include <scsi/scsi_host.h>
  32 #include <mach/palmld.h>
  33
  34 #define DRV_NAME "pata_palmld"
  35
  36 struct palmld_pata {
  37         struct ata_host *host;
  38         struct gpio_desc *power;
  39         struct gpio_desc *reset;
  40 };
  41
  42 static struct scsi_host_template palmld_sht = {
  43         ATA_PIO_SHT(DRV_NAME),
  44 };
  45
  46 static struct ata_port_operations palmld_port_ops = {
  47         .inherits               = &ata_sff_port_ops,
  48         .sff_data_xfer          = ata_sff_data_xfer32,
  49         .cable_detect           = ata_cable_40wire,
  50 };
  51
  52 static int palmld_pata_probe(struct platform_device *pdev)
  53 {
  54         struct palmld_pata *lda;
  55         struct ata_port *ap;
  56         void __iomem *mem;
  57         struct device *dev = &pdev->dev;
  58         int ret;
  59
  60         lda = devm_kzalloc(dev, sizeof(*lda), GFP_KERNEL);
  61         if (!lda)
  62                 return -ENOMEM;
  63
  64         /* allocate host */
  65         lda->host = ata_host_alloc(dev, 1);
  66         if (!lda->host)
  67                 return -ENOMEM;
  68
  69         /* remap drive's physical memory address */
  70         mem = devm_ioremap(dev, PALMLD_IDE_PHYS, 0x1000);
  71         if (!mem)
  72                 return -ENOMEM;
  73
  74         /* request and activate power and reset GPIOs */
  75         lda->power = devm_gpiod_get(dev, "power", GPIOD_OUT_HIGH);
  76         if (IS_ERR(lda->power))
  77                 return PTR_ERR(lda->power);
  78         lda->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
  79         if (IS_ERR(lda->reset)) {
  80                 gpiod_set_value(lda->power, 0);
  81                 return PTR_ERR(lda->reset);
  82         }
  83
  84         /* Assert reset to reset the drive */
  85         gpiod_set_value(lda->reset, 1);
  86         msleep(30);
  87         gpiod_set_value(lda->reset, 0);
  88         msleep(30);
  89
  90         /* setup the ata port */
  91         ap = lda->host->ports[0];
  92         ap->ops = &palmld_port_ops;
  93         ap->pio_mask = ATA_PIO4;
  94         ap->flags |= ATA_FLAG_PIO_POLLING;
  95
  96         /* memory mapping voodoo */
  97         ap->ioaddr.cmd_addr = mem + 0x10;
  98         ap->ioaddr.altstatus_addr = mem + 0xe;
  99         ap->ioaddr.ctl_addr = mem + 0xe;
 100
 101         /* start the port */
 102         ata_sff_std_ports(&ap->ioaddr);
 103
 104         /* activate host */
 105         ret = ata_host_activate(lda->host, 0, NULL, IRQF_TRIGGER_RISING,
 106                                 &palmld_sht);
 107         /* power down on failure */
 108         if (ret) {
 109                 gpiod_set_value(lda->power, 0);
 110                 return ret;
 111         }
 112
 113         platform_set_drvdata(pdev, lda);
 114         return 0;
 115 }
 116
 117 static int palmld_pata_remove(struct platform_device *pdev)
 118 {
 119         struct palmld_pata *lda = platform_get_drvdata(pdev);
 120
 121         ata_platform_remove_one(pdev);
 122
 123         /* power down the HDD */
 124         gpiod_set_value(lda->power, 0);
 125
 126         return 0;
 127 }
 128
 129 static struct platform_driver palmld_pata_platform_driver = {
 130         .driver  = {
 131                 .name   = DRV_NAME,
 132         },
 133         .probe          = palmld_pata_probe,
 134         .remove         = palmld_pata_remove,
 135 };
 136
 137 module_platform_driver(palmld_pata_platform_driver);
 138
 139 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
 140 MODULE_DESCRIPTION("PalmLD PATA driver");
 141 MODULE_LICENSE("GPL");
 142 MODULE_ALIAS("platform:" DRV_NAME);