target/linux/adm5120/files-3.8/drivers/ata/pata_rb153_cf.c

   1 /*
   2  *  A low-level PATA driver to handle a Compact Flash connected on the
   3  *  Mikrotik's RouterBoard 153 board.
   4  *
   5  *  Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
   6  *
   7  *  This file was based on: drivers/ata/pata_ixp4xx_cf.c
   8  *      Copyright (C) 2006-07 Tower Technologies
   9  *      Author: Alessandro Zummo <a.zummo@towertech.it>
  10  *
  11  *  Also was based on the driver for Linux 2.4.xx published by Mikrotik for
  12  *  their RouterBoard 1xx and 5xx series devices. The original Mikrotik code
  13  *  seems not to have a license.
  14  *
  15  *  This program is free software; you can redistribute it and/or modify it
  16  *  under the terms of the GNU General Public License version 2 as published
  17  *  by the Free Software Foundation.
  18  *
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/io.h>
  24 #include <linux/interrupt.h>
  25 #include <linux/irq.h>
  26 #include <linux/gpio.h>
  27 #include <linux/platform_device.h>
  28
  29 #include <linux/libata.h>
  30 #include <scsi/scsi_host.h>
  31
  32 #define DRV_NAME        "pata-rb153-cf"
  33 #define DRV_VERSION     "0.5.0"
  34 #define DRV_DESC        "PATA driver for RouterBOARD 153 Compact Flash"
  35
  36 #define RB153_CF_MAXPORTS       1
  37 #define RB153_CF_IO_DELAY       100
  38
  39 #define RB153_CF_REG_CMD        0x0800
  40 #define RB153_CF_REG_CTRL       0x080E
  41 #define RB153_CF_REG_DATA       0x0C00
  42
  43 struct rb153_cf_info {
  44         void __iomem    *iobase;
  45         unsigned int    gpio_line;
  46         int             frozen;
  47         unsigned int    irq;
  48 };
  49
  50 static inline void rb153_pata_finish_io(struct ata_port *ap)
  51 {
  52         struct rb153_cf_info *info = ap->host->private_data;
  53
  54         /* FIXME: Keep previous delay. If this is merely a fence then
  55          * ata_sff_sync might be sufficient. */
  56         ata_sff_dma_pause(ap);
  57         ndelay(RB153_CF_IO_DELAY);
  58
  59         irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
  60 }
  61
  62 static void rb153_pata_exec_command(struct ata_port *ap,
  63                                         const struct ata_taskfile *tf)
  64 {
  65         writeb(tf->command, ap->ioaddr.command_addr);
  66         rb153_pata_finish_io(ap);
  67 }
  68
  69 static unsigned int rb153_pata_data_xfer(struct ata_device *adev,
  70                                         unsigned char *buf,
  71                                         unsigned int buflen,
  72                                         int write_data)
  73 {
  74         void __iomem *ioaddr = adev->link->ap->ioaddr.data_addr;
  75         unsigned int t;
  76
  77         t = buflen;
  78         if (write_data) {
  79                 for (; t > 0; t--, buf++)
  80                         writeb(*buf, ioaddr);
  81         } else {
  82                 for (; t > 0; t--, buf++)
  83                         *buf = readb(ioaddr);
  84         }
  85
  86         rb153_pata_finish_io(adev->link->ap);
  87         return buflen;
  88 }
  89
  90 static void rb153_pata_freeze(struct ata_port *ap)
  91 {
  92         struct rb153_cf_info *info = ap->host->private_data;
  93
  94         info->frozen = 1;
  95 }
  96
  97 static void rb153_pata_thaw(struct ata_port *ap)
  98 {
  99         struct rb153_cf_info *info = ap->host->private_data;
 100
 101         info->frozen = 0;
 102 }
 103
 104 static irqreturn_t rb153_pata_irq_handler(int irq, void *dev_instance)
 105 {
 106         struct ata_host *ah = dev_instance;
 107         struct rb153_cf_info *info = ah->private_data;
 108
 109         if (gpio_get_value(info->gpio_line)) {
 110                 irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
 111                 if (!info->frozen)
 112                         ata_sff_interrupt(irq, dev_instance);
 113         } else {
 114                 irq_set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
 115         }
 116
 117         return IRQ_HANDLED;
 118 }
 119
 120 static struct ata_port_operations rb153_pata_port_ops = {
 121         .inherits               = &ata_sff_port_ops,
 122         .sff_exec_command       = rb153_pata_exec_command,
 123         .sff_data_xfer          = rb153_pata_data_xfer,
 124         .freeze                 = rb153_pata_freeze,
 125         .thaw                   = rb153_pata_thaw,
 126 };
 127
 128 static struct scsi_host_template rb153_pata_sht = {
 129         ATA_PIO_SHT(DRV_NAME),
 130 };
 131
 132 static void rb153_pata_setup_port(struct ata_host *ah)
 133 {
 134         struct rb153_cf_info *info = ah->private_data;
 135         struct ata_port *ap;
 136
 137         ap = ah->ports[0];
 138
 139         ap->ops         = &rb153_pata_port_ops;
 140         ap->pio_mask    = 0x1f; /* PIO4 */
 141
 142         ap->ioaddr.cmd_addr     = info->iobase + RB153_CF_REG_CMD;
 143         ap->ioaddr.ctl_addr     = info->iobase + RB153_CF_REG_CTRL;
 144         ap->ioaddr.altstatus_addr = info->iobase + RB153_CF_REG_CTRL;
 145
 146         ata_sff_std_ports(&ap->ioaddr);
 147
 148         ap->ioaddr.data_addr = info->iobase + RB153_CF_REG_DATA;
 149 }
 150
 151 static int rb153_pata_driver_probe(struct platform_device *pdev)
 152 {
 153         unsigned int irq;
 154         int gpio;
 155         struct resource *res;
 156         struct ata_host *ah;
 157         struct rb153_cf_info *info;
 158         int ret;
 159
 160         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 161         if (!res) {
 162                 dev_err(&pdev->dev, "no IOMEM resource found\n");
 163                 return -EINVAL;
 164         }
 165
 166         irq = platform_get_irq(pdev, 0);
 167         if (irq <= 0) {
 168                 dev_err(&pdev->dev, "no IRQ resource found\n");
 169                 return -ENOENT;
 170         }
 171
 172         gpio = irq_to_gpio(irq);
 173         if (gpio < 0) {
 174                 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
 175                 return -ENOENT;
 176         }
 177
 178         ret = gpio_request(gpio, DRV_NAME);
 179         if (ret) {
 180                 dev_err(&pdev->dev, "GPIO request failed\n");
 181                 return ret;
 182         }
 183
 184         ah = ata_host_alloc(&pdev->dev, RB153_CF_MAXPORTS);
 185         if (!ah)
 186                 return -ENOMEM;
 187
 188         platform_set_drvdata(pdev, ah);
 189
 190         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 191         if (!info)
 192                 return -ENOMEM;
 193
 194         ah->private_data = info;
 195         info->gpio_line = gpio;
 196         info->irq = irq;
 197
 198         info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
 199                                 res->end - res->start + 1);
 200         if (!info->iobase)
 201                 return -ENOMEM;
 202
 203         ret = gpio_direction_input(gpio);
 204         if (ret) {
 205                 dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
 206                                 ret);
 207                 goto err_free_gpio;
 208         }
 209
 210         rb153_pata_setup_port(ah);
 211
 212         ret = ata_host_activate(ah, irq, rb153_pata_irq_handler,
 213                                 IRQF_TRIGGER_LOW, &rb153_pata_sht);
 214         if (ret)
 215                 goto err_free_gpio;
 216
 217         return 0;
 218
 219 err_free_gpio:
 220         gpio_free(gpio);
 221
 222         return ret;
 223 }
 224
 225 static int rb153_pata_driver_remove(struct platform_device *pdev)
 226 {
 227         struct ata_host *ah = platform_get_drvdata(pdev);
 228         struct rb153_cf_info *info = ah->private_data;
 229
 230         ata_host_detach(ah);
 231         gpio_free(info->gpio_line);
 232
 233         return 0;
 234 }
 235
 236 static struct platform_driver rb153_pata_platform_driver = {
 237         .probe          = rb153_pata_driver_probe,
 238         .remove         = rb153_pata_driver_remove,
 239         .driver  = {
 240                 .name   = DRV_NAME,
 241                 .owner  = THIS_MODULE,
 242         },
 243 };
 244
 245 /* ------------------------------------------------------------------------ */
 246
 247 #define DRV_INFO DRV_DESC " version " DRV_VERSION
 248
 249 static int __init rb153_pata_module_init(void)
 250 {
 251         printk(KERN_INFO DRV_INFO "\n");
 252
 253         return platform_driver_register(&rb153_pata_platform_driver);
 254 }
 255
 256 static void __exit rb153_pata_module_exit(void)
 257 {
 258         platform_driver_unregister(&rb153_pata_platform_driver);
 259 }
 260
 261 MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
 262 MODULE_DESCRIPTION(DRV_DESC);
 263 MODULE_VERSION(DRV_VERSION);
 264 MODULE_LICENSE("GPL v2");
 265
 266 module_init(rb153_pata_module_init);
 267 module_exit(rb153_pata_module_exit);