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
  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
  49 struct rb532_cf_info {
  50         void __iomem    *iobase;
  51         unsigned int    gpio_line;
  52         unsigned int    irq;
  53 };
  54
  55 /* ------------------------------------------------------------------------ */
  56
  57 static 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                 set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
  64                 ata_sff_interrupt(info->irq, dev_instance);
  65         } else {
  66                 set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
  67         }
  68
  69         return IRQ_HANDLED;
  70 }
  71
  72 static 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
  79 static struct scsi_host_template rb532_pata_sht = {
  80         ATA_PIO_SHT(DRV_NAME),
  81 };
  82
  83 /* ------------------------------------------------------------------------ */
  84
  85 static 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         ap->flags       = ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO;
  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 __devinit 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 rb532_cf_info *info;
 113         int ret;
 114
 115         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 116         if (!res) {
 117                 dev_err(&pdev->dev, "no IOMEM resource found\n");
 118                 return -EINVAL;
 119         }
 120
 121         irq = platform_get_irq(pdev, 0);
 122         if (irq <= 0) {
 123                 dev_err(&pdev->dev, "no IRQ resource found\n");
 124                 return -ENOENT;
 125         }
 126
 127         gpio = irq_to_gpio(irq);
 128         if (gpio < 0) {
 129                 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
 130                 return -ENOENT;
 131         }
 132
 133         ret = gpio_request(gpio, DRV_NAME);
 134         if (ret) {
 135                 dev_err(&pdev->dev, "GPIO request failed\n");
 136                 return ret;
 137         }
 138
 139         /* allocate host */
 140         ah = ata_host_alloc(&pdev->dev, RB500_CF_MAXPORTS);
 141         if (!ah)
 142                 return -ENOMEM;
 143
 144         platform_set_drvdata(pdev, ah);
 145
 146         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 147         if (!info)
 148                 return -ENOMEM;
 149
 150         ah->private_data = info;
 151         info->gpio_line = gpio;
 152         info->irq = irq;
 153
 154         info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
 155                                 resource_size(res));
 156         if (!info->iobase)
 157                 return -ENOMEM;
 158
 159         ret = gpio_direction_input(gpio);
 160         if (ret) {
 161                 dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
 162                                 ret);
 163                 goto err_free_gpio;
 164         }
 165
 166         rb532_pata_setup_ports(ah);
 167
 168         ret = ata_host_activate(ah, irq, rb532_pata_irq_handler,
 169                                 IRQF_TRIGGER_LOW, &rb532_pata_sht);
 170         if (ret)
 171                 goto err_free_gpio;
 172
 173         return 0;
 174
 175 err_free_gpio:
 176         gpio_free(gpio);
 177
 178         return ret;
 179 }
 180
 181 static __devexit int rb532_pata_driver_remove(struct platform_device *pdev)
 182 {
 183         struct ata_host *ah = platform_get_drvdata(pdev);
 184         struct rb532_cf_info *info = ah->private_data;
 185
 186         ata_host_detach(ah);
 187         gpio_free(info->gpio_line);
 188
 189         return 0;
 190 }
 191
 192 /* work with hotplug and coldplug */
 193 MODULE_ALIAS("platform:" DRV_NAME);
 194
 195 static struct platform_driver rb532_pata_platform_driver = {
 196         .probe          = rb532_pata_driver_probe,
 197         .remove         = __devexit_p(rb532_pata_driver_remove),
 198         .driver  = {
 199                 .name   = DRV_NAME,
 200                 .owner  = THIS_MODULE,
 201         },
 202 };
 203
 204 /* ------------------------------------------------------------------------ */
 205
 206 #define DRV_INFO DRV_DESC " version " DRV_VERSION
 207
 208 static int __init rb532_pata_module_init(void)
 209 {
 210         printk(KERN_INFO DRV_INFO "\n");
 211
 212         return platform_driver_register(&rb532_pata_platform_driver);
 213 }
 214
 215 static void __exit rb532_pata_module_exit(void)
 216 {
 217         platform_driver_unregister(&rb532_pata_platform_driver);
 218 }
 219
 220 MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
 221 MODULE_AUTHOR("Florian Fainelli <florian@openwrt.org>");
 222 MODULE_DESCRIPTION(DRV_DESC);
 223 MODULE_VERSION(DRV_VERSION);
 224 MODULE_LICENSE("GPL");
 225
 226 module_init(rb532_pata_module_init);
 227 module_exit(rb532_pata_module_exit);