drivers/ata/pata_rb532_cf.c

   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 #include <linux/gpio.h>
  31
  32 #include <linux/libata.h>
  33 #include <scsi/scsi_host.h>
  34
  35 #include <asm/mach-rc32434/rb.h>
  36
  37 #define DRV_NAME        "pata-rb532-cf"
  38 #define DRV_VERSION     "0.1.0"
  39 #define DRV_DESC        "PATA driver for RouterBOARD 532 Compact Flash"
  40
  41 #define RB500_CF_MAXPORTS       1
  42 #define RB500_CF_IO_DELAY       400
  43
  44 #define RB500_CF_REG_BASE       0x0800
  45 #define RB500_CF_REG_ERR        0x080D
  46 #define RB500_CF_REG_CTRL       0x080E
  47 /* 32bit buffered data register offset */
  48 #define RB500_CF_REG_DBUF32     0x0C00
  49
  50 struct rb532_cf_info {
  51         void __iomem    *iobase;
  52         unsigned int    gpio_line;
  53         unsigned int    irq;
  54 };
  55
  56 /* ------------------------------------------------------------------------ */
  57
  58 static irqreturn_t rb532_pata_irq_handler(int irq, void *dev_instance)
  59 {
  60         struct ata_host *ah = dev_instance;
  61         struct rb532_cf_info *info = ah->private_data;
  62
  63         if (gpio_get_value(info->gpio_line)) {
  64                 irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
  65                 ata_sff_interrupt(info->irq, dev_instance);
  66         } else {
  67                 irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
  68         }
  69
  70         return IRQ_HANDLED;
  71 }
  72
  73 static struct ata_port_operations rb532_pata_port_ops = {
  74         .inherits               = &ata_sff_port_ops,
  75         .sff_data_xfer          = ata_sff_data_xfer32,
  76 };
  77
  78 /* ------------------------------------------------------------------------ */
  79
  80 static struct scsi_host_template rb532_pata_sht = {
  81         ATA_PIO_SHT(DRV_NAME),
  82 };
  83
  84 /* ------------------------------------------------------------------------ */
  85
  86 static void rb532_pata_setup_ports(struct ata_host *ah)
  87 {
  88         struct rb532_cf_info *info = ah->private_data;
  89         struct ata_port *ap;
  90
  91         ap = ah->ports[0];
  92
  93         ap->ops         = &rb532_pata_port_ops;
  94         ap->pio_mask    = ATA_PIO4;
  95
  96         ap->ioaddr.cmd_addr     = info->iobase + RB500_CF_REG_BASE;
  97         ap->ioaddr.ctl_addr     = info->iobase + RB500_CF_REG_CTRL;
  98         ap->ioaddr.altstatus_addr = info->iobase + RB500_CF_REG_CTRL;
  99
 100         ata_sff_std_ports(&ap->ioaddr);
 101
 102         ap->ioaddr.data_addr    = info->iobase + RB500_CF_REG_DBUF32;
 103         ap->ioaddr.error_addr   = info->iobase + RB500_CF_REG_ERR;
 104 }
 105
 106 static int rb532_pata_driver_probe(struct platform_device *pdev)
 107 {
 108         int irq;
 109         int gpio;
 110         struct resource *res;
 111         struct ata_host *ah;
 112         struct cf_device *pdata;
 113         struct rb532_cf_info *info;
 114         int ret;
 115
 116         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 117         if (!res) {
 118                 dev_err(&pdev->dev, "no IOMEM resource found\n");
 119                 return -EINVAL;
 120         }
 121
 122         irq = platform_get_irq(pdev, 0);
 123         if (irq <= 0) {
 124                 dev_err(&pdev->dev, "no IRQ resource found\n");
 125                 return -ENOENT;
 126         }
 127
 128         pdata = dev_get_platdata(&pdev->dev);
 129         if (!pdata) {
 130                 dev_err(&pdev->dev, "no platform data specified\n");
 131                 return -EINVAL;
 132         }
 133
 134         gpio = pdata->gpio_pin;
 135         if (gpio < 0) {
 136                 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
 137                 return -ENOENT;
 138         }
 139
 140         ret = gpio_request(gpio, DRV_NAME);
 141         if (ret) {
 142                 dev_err(&pdev->dev, "GPIO request failed\n");
 143                 return ret;
 144         }
 145
 146         /* allocate host */
 147         ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS);
 148         if (!ah)
 149                 return -ENOMEM;
 150
 151         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 152         if (!info)
 153                 return -ENOMEM;
 154
 155         ah->private_data = info;
 156         info->gpio_line = gpio;
 157         info->irq = irq;
 158
 159         info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
 160                                 resource_size(res));
 161         if (!info->iobase)
 162                 return -ENOMEM;
 163
 164         ret = gpio_direction_input(gpio);
 165         if (ret) {
 166                 dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
 167                                 ret);
 168                 goto err_free_gpio;
 169         }
 170
 171         rb532_pata_setup_ports(ah);
 172
 173         ret = ata_host_activate(ah, irq, rb532_pata_irq_handler,
 174                                 IRQF_TRIGGER_LOW, &rb532_pata_sht);
 175         if (ret)
 176                 goto err_free_gpio;
 177
 178         return 0;
 179
 180 err_free_gpio:
 181         gpio_free(gpio);
 182
 183         return ret;
 184 }
 185
 186 static int rb532_pata_driver_remove(struct platform_device *pdev)
 187 {
 188         struct ata_host *ah = platform_get_drvdata(pdev);
 189         struct rb532_cf_info *info = ah->private_data;
 190
 191         ata_host_detach(ah);
 192         gpio_free(info->gpio_line);
 193
 194         return 0;
 195 }
 196
 197 static struct platform_driver rb532_pata_platform_driver = {
 198         .probe          = rb532_pata_driver_probe,
 199         .remove         = rb532_pata_driver_remove,
 200         .driver  = {
 201                 .name   = DRV_NAME,
 202         },
 203 };
 204
 205 #define DRV_INFO DRV_DESC " version " DRV_VERSION
 206
 207 module_platform_driver(rb532_pata_platform_driver);
 208
 209 MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
 210 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
 211 MODULE_DESCRIPTION(DRV_DESC);
 212 MODULE_VERSION(DRV_VERSION);
 213 MODULE_LICENSE("GPL");
 214 MODULE_ALIAS("platform:" DRV_NAME);