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Linux/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_xfer_noirq,
 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                 .owner  = THIS_MODULE,
128         },
129         .probe          = palmld_pata_probe,
130         .remove         = palmld_pata_remove,
131 };
132 
133 module_platform_driver(palmld_pata_platform_driver);
134 
135 MODULE_AUTHOR("Marek Vasut <marek.vasut@gmail.com>");
136 MODULE_DESCRIPTION("PalmLD PATA driver");
137 MODULE_LICENSE("GPL");
138 MODULE_ALIAS("platform:" DRV_NAME);
139 

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