release/src-rt-6.x.4708/linux/linux-2.6.36/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 scsi_host_template palmld_sht = {
  37         ATA_PIO_SHT(DRV_NAME),
  38 };
  39
  40 static struct ata_port_operations palmld_port_ops = {
  41         .inherits               = &ata_sff_port_ops,
  42         .sff_data_xfer          = ata_sff_data_xfer_noirq,
  43         .cable_detect           = ata_cable_40wire,
  44 };
  45
  46 static __devinit int palmld_pata_probe(struct platform_device *pdev)
  47 {
  48         struct ata_host *host;
  49         struct ata_port *ap;
  50         void __iomem *mem;
  51         int ret;
  52
  53         /* allocate host */
  54         host = ata_host_alloc(&pdev->dev, 1);
  55         if (!host)
  56                 return -ENOMEM;
  57
  58         /* remap drive's physical memory address */
  59         mem = devm_ioremap(&pdev->dev, PALMLD_IDE_PHYS, 0x1000);
  60         if (!mem)
  61                 return -ENOMEM;
  62
  63         /* request and activate power GPIO, IRQ GPIO */
  64         ret = gpio_request(GPIO_NR_PALMLD_IDE_PWEN, "HDD PWR");
  65         if (ret)
  66                 goto err1;
  67         ret = gpio_direction_output(GPIO_NR_PALMLD_IDE_PWEN, 1);
  68         if (ret)
  69                 goto err2;
  70
  71         ret = gpio_request(GPIO_NR_PALMLD_IDE_RESET, "HDD RST");
  72         if (ret)
  73                 goto err2;
  74         ret = gpio_direction_output(GPIO_NR_PALMLD_IDE_RESET, 0);
  75         if (ret)
  76                 goto err3;
  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_MMIO | ATA_FLAG_NO_LEGACY | 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         return ata_host_activate(host, 0, NULL, IRQF_TRIGGER_RISING,
 100                                         &palmld_sht);
 101
 102 err3:
 103         gpio_free(GPIO_NR_PALMLD_IDE_RESET);
 104 err2:
 105         gpio_free(GPIO_NR_PALMLD_IDE_PWEN);
 106 err1:
 107         return ret;
 108 }
 109
 110 static __devexit int palmld_pata_remove(struct platform_device *dev)
 111 {
 112         struct ata_host *host = platform_get_drvdata(dev);
 113
 114         ata_host_detach(host);
 115
 116         /* power down the HDD */
 117         gpio_set_value(GPIO_NR_PALMLD_IDE_PWEN, 0);
 118
 119         gpio_free(GPIO_NR_PALMLD_IDE_RESET);
 120         gpio_free(GPIO_NR_PALMLD_IDE_PWEN);
 121
 122         return 0;
 123 }
 124
 125 static struct platform_driver palmld_pata_platform_driver = {
 126         .driver  = {
 127                 .name   = DRV_NAME,
 128                 .owner  = THIS_MODULE,
 129         },
 130         .probe          = palmld_pata_probe,
 131         .remove         = __devexit_p(palmld_pata_remove),
 132 };
 133
 134 static int __init palmld_pata_init(void)
 135 {
 136         return platform_driver_register(&palmld_pata_platform_driver);
 137 }
 138
 139 static void __exit palmld_pata_exit(void)
 140 {
 141         platform_driver_unregister(&palmld_pata_platform_driver);
 142 }
 143
 144 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
 145 MODULE_DESCRIPTION("PalmLD PATA driver");
 146 MODULE_LICENSE("GPL");
 147 MODULE_ALIAS("platform:" DRV_NAME);
 148
 149 module_init(palmld_pata_init);
 150 module_exit(palmld_pata_exit);