linux/drivers/ata/pata_rb532_cf.c
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   1/*
   2 *  A low-level PATA driver to handle a Compact Flash connected on the
   3 *  Mikrotik's RouterBoard 532 board.
   4 *
   5 *  Copyright (C) 2007 Gabor Juhos <juhosg at openwrt.org>
   6 *  Copyright (C) 2008 Florian Fainelli <florian@openwrt.org>
   7 *
   8 *  This file was based on: drivers/ata/pata_ixp4xx_cf.c
   9 *      Copyright (C) 2006-07 Tower Technologies
  10 *      Author: Alessandro Zummo <a.zummo@towertech.it>
  11 *
  12 *  Also was based on the driver for Linux 2.4.xx published by Mikrotik for
  13 *  their RouterBoard 1xx and 5xx series devices. The original Mikrotik code
  14 *  seems not to have a license.
  15 *
  16 *  This program is free software; you can redistribute it and/or modify
  17 *  it under the terms of the GNU General Public License version 2 as
  18 *  published by the Free Software Foundation.
  19 *
  20 */
  21
  22#include <linux/gfp.h>
  23#include <linux/kernel.h>
  24#include <linux/module.h>
  25#include <linux/platform_device.h>
  26
  27#include <linux/io.h>
  28#include <linux/interrupt.h>
  29#include <linux/irq.h>
  30
  31#include <linux/libata.h>
  32#include <scsi/scsi_host.h>
  33
  34#include <asm/gpio.h>
  35
  36#define DRV_NAME        "pata-rb532-cf"
  37#define DRV_VERSION     "0.1.0"
  38#define DRV_DESC        "PATA driver for RouterBOARD 532 Compact Flash"
  39
  40#define RB500_CF_MAXPORTS       1
  41#define RB500_CF_IO_DELAY       400
  42
  43#define RB500_CF_REG_BASE       0x0800
  44#define RB500_CF_REG_ERR        0x080D
  45#define RB500_CF_REG_CTRL       0x080E
  46/* 32bit buffered data register offset */
  47#define RB500_CF_REG_DBUF32     0x0C00
  48
  49struct rb532_cf_info {
  50        void __iomem    *iobase;
  51        unsigned int    gpio_line;
  52        unsigned int    irq;
  53};
  54
  55/* ------------------------------------------------------------------------ */
  56
  57static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance)
  58{
  59        struct ata_host *ah = dev_instance;
  60        struct rb532_cf_info *info = ah->private_data;
  61
  62        if (gpio_get_value(info->gpio_line)) {
  63                irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
  64                ata_sff_interrupt(info->irq, dev_instance);
  65        } else {
  66                irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
  67        }
  68
  69        return IRQ_HANDLED;
  70}
  71
  72static struct ata_port_operations rb532_pata_port_ops = {
  73        .inherits               = &ata_sff_port_ops,
  74        .sff_data_xfer          = ata_sff_data_xfer32,
  75};
  76
  77/* ------------------------------------------------------------------------ */
  78
  79static struct scsi_host_template rb532_pata_sht = {
  80        ATA_PIO_SHT(DRV_NAME),
  81};
  82
  83/* ------------------------------------------------------------------------ */
  84
  85static void rb532_pata_setup_ports(struct ata_host *ah)
  86{
  87        struct rb532_cf_info *info = ah->private_data;
  88        struct ata_port *ap;
  89
  90        ap = ah->ports[0];
  91
  92        ap->ops         = &rb532_pata_port_ops;
  93        ap->pio_mask    = ATA_PIO4;
  94
  95        ap->ioaddr.cmd_addr     = info->iobase + RB500_CF_REG_BASE;
  96        ap->ioaddr.ctl_addr     = info->iobase + RB500_CF_REG_CTRL;
  97        ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL;
  98
  99        ata_sff_std_ports(&ap->ioaddr);
 100
 101        ap->ioaddr.data_addr    = info->iobase + RB500_CF_REG_DBUF32;
 102        ap->ioaddr.error_addr   = info->iobase + RB500_CF_REG_ERR;
 103}
 104
 105static int rb532_pata_driver_probe(struct platform_device *pdev)
 106{
 107        int irq;
 108        int gpio;
 109        struct resource *res;
 110        struct ata_host *ah;
 111        struct rb532_cf_info *info;
 112        int ret;
 113
 114        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 115        if (!res) {
 116                dev_err(&pdev->dev, "no IOMEM resource found\n");
 117                return -EINVAL;
 118        }
 119
 120        irq = platform_get_irq(pdev, 0);
 121        if (irq <= 0) {
 122                dev_err(&pdev->dev, "no IRQ resource found\n");
 123                return -ENOENT;
 124        }
 125
 126        gpio = irq_to_gpio(irq);
 127        if (gpio < 0) {
 128                dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
 129                return -ENOENT;
 130        }
 131
 132        ret = gpio_request(gpio, DRV_NAME);
 133        if (ret) {
 134                dev_err(&pdev->dev, "GPIO request failed\n");
 135                return ret;
 136        }
 137
 138        /* allocate host */
 139        ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS);
 140        if (!ah)
 141                return -ENOMEM;
 142
 143        platform_set_drvdata(pdev, ah);
 144
 145        info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 146        if (!info)
 147                return -ENOMEM;
 148
 149        ah->private_data = info;
 150        info->gpio_line = gpio;
 151        info->irq = irq;
 152
 153        info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
 154                                resource_size(res));
 155        if (!info->iobase)
 156                return -ENOMEM;
 157
 158        ret = gpio_direction_input(gpio);
 159        if (ret) {
 160                dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
 161                                ret);
 162                goto err_free_gpio;
 163        }
 164
 165        rb532_pata_setup_ports(ah);
 166
 167        ret = ata_host_activate(ah, irq, rb532_pata_irq_handler,
 168                                IRQF_TRIGGER_LOW, &rb532_pata_sht);
 169        if (ret)
 170                goto err_free_gpio;
 171
 172        return 0;
 173
 174err_free_gpio:
 175        gpio_free(gpio);
 176
 177        return ret;
 178}
 179
 180static int rb532_pata_driver_remove(struct platform_device *pdev)
 181{
 182        struct ata_host *ah = platform_get_drvdata(pdev);
 183        struct rb532_cf_info *info = ah->private_data;
 184
 185        ata_host_detach(ah);
 186        gpio_free(info->gpio_line);
 187
 188        return 0;
 189}
 190
 191static struct platform_driver rb532_pata_platform_driver = {
 192        .probe          = rb532_pata_driver_probe,
 193        .remove         = rb532_pata_driver_remove,
 194        .driver  = {
 195                .name   = DRV_NAME,
 196                .owner  = THIS_MODULE,
 197        },
 198};
 199
 200#define DRV_INFO DRV_DESC " version " DRV_VERSION
 201
 202module_platform_driver(rb532_pata_platform_driver);
 203
 204MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
 205MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
 206MODULE_DESCRIPTION(DRV_DESC);
 207MODULE_VERSION(DRV_VERSION);
 208MODULE_LICENSE("GPL");
 209MODULE_ALIAS("platform:" DRV_NAME);
 210
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