target/linux/adm5120/files/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 Gabor Juhos <juhosg at 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
  16  *  it under the terms of the GNU General Public License version 2 as
  17  *  published by the Free Software Foundation.
  18  *
  19  */
  20
  21 #include <linux/kernel.h>
  22 #include <linux/module.h>
  23 #include <linux/platform_device.h>
  24
  25 #include <linux/io.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/irq.h>
  28
  29 #include <linux/libata.h>
  30 #include <scsi/scsi_host.h>
  31
  32 #include <asm/gpio.h>
  33
  34 #define DRV_NAME        "pata-rb153-cf"
  35 #define DRV_VERSION     "0.1"
  36 #define DRV_DESC        "PATA driver for RouterBOARD 153 Compact Flash"
  37
  38 #define RB153_CF_MAXPORTS       1
  39 #define RB153_CF_IO_DELAY       100
  40
  41 #define RB153_CF_REG_CMD        0x0800
  42 #define RB153_CF_REG_CTRL       0x080E
  43 #define RB153_CF_REG_DATA       0x0C00
  44
  45 struct rb153_cf_info {
  46         void __iomem    *iobase;
  47         unsigned int    gpio_line;
  48         int             error;
  49 };
  50
  51 /* ------------------------------------------------------------------------ */
  52
  53 static inline void rb153_pata_finish_io(struct ata_port *ap)
  54 {
  55         struct ata_host *ah = ap->host;
  56
  57         ata_altstatus(ap);
  58         ndelay(RB153_CF_IO_DELAY);
  59
  60         set_irq_type(ah->irq, IRQ_TYPE_LEVEL_HIGH);
  61 }
  62
  63 static void rb153_pata_exec_command(struct ata_port *ap,
  64                                 const struct ata_taskfile *tf)
  65 {
  66         writeb(tf->command, ap->ioaddr.command_addr);
  67         rb153_pata_finish_io(ap);
  68 }
  69
  70 static void rb153_pata_data_xfer(struct ata_device *adev, unsigned char *buf,
  71                                 unsigned int buflen, int write_data)
  72 {
  73         struct ata_port *ap = adev->ap;
  74         unsigned int i;
  75
  76         if (write_data) {
  77                 for (i = 0; i < buflen; i++)
  78                         writeb(buf[i], ap->ioaddr.data_addr);
  79         } else {
  80                 for (; buflen > 0; buflen--)
  81                         buf[i] = readb(ap->ioaddr.data_addr);
  82         }
  83
  84         rb153_pata_finish_io(ap);
  85 }
  86
  87 static void rb153_pata_thaw(struct ata_port *ap)
  88 {
  89         struct rb153_cf_info *info = ap->host->private_data;
  90
  91         info->error = 0;
  92 }
  93
  94 static irqreturn_t rb153_pata_irq_handler(int irq, void *dev_instance)
  95 {
  96         struct ata_host *ah = dev_instance;
  97         struct rb153_cf_info *info = ah->private_data;
  98
  99         if (gpio_get_value(info->gpio_line)) {
 100                 set_irq_type(ah->irq, IRQ_TYPE_LEVEL_LOW);
 101                 if (!info->error)
 102                         ata_interrupt(irq, dev_instance);
 103         } else {
 104                 set_irq_type(ah->irq, IRQ_TYPE_LEVEL_HIGH);
 105         }
 106
 107         return IRQ_HANDLED;
 108 }
 109
 110 static void rb153_pata_irq_clear(struct ata_port *ap)
 111 {
 112 }
 113
 114 static int rb153_pata_port_start(struct ata_port *ap)
 115 {
 116         return 0;
 117 }
 118
 119 static struct ata_port_operations rb153_pata_port_ops = {
 120         .port_disable           = ata_port_disable,
 121
 122         .tf_load                = ata_tf_load,
 123         .tf_read                = ata_tf_read,
 124
 125         .exec_command           = rb153_pata_exec_command,
 126         .check_status           = ata_check_status,
 127         .dev_select             = ata_std_dev_select,
 128
 129         .data_xfer              = rb153_pata_data_xfer,
 130
 131         .qc_prep                = ata_qc_prep,
 132         .qc_issue               = ata_qc_issue_prot,
 133
 134         .thaw                   = rb153_pata_thaw,
 135         .error_handler          = ata_bmdma_error_handler,
 136
 137         .irq_handler            = rb153_pata_irq_handler,
 138         .irq_clear              = rb153_pata_irq_clear,
 139         .irq_on                 = ata_irq_on,
 140
 141         .port_start             = rb153_pata_port_start,
 142 };
 143
 144 /* ------------------------------------------------------------------------ */
 145
 146 static struct scsi_host_template rb153_pata_sht = {
 147         .module                 = THIS_MODULE,
 148         .name                   = DRV_NAME,
 149         .ioctl                  = ata_scsi_ioctl,
 150         .queuecommand           = ata_scsi_queuecmd,
 151         .slave_configure        = ata_scsi_slave_config,
 152         .slave_destroy          = ata_scsi_slave_destroy,
 153         .bios_param             = ata_std_bios_param,
 154         .proc_name              = DRV_NAME,
 155
 156         .can_queue              = ATA_DEF_QUEUE,
 157         .this_id                = ATA_SHT_THIS_ID,
 158         .sg_tablesize           = LIBATA_MAX_PRD,
 159         .dma_boundary           = ATA_DMA_BOUNDARY,
 160         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
 161         .emulated               = ATA_SHT_EMULATED,
 162         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 163 };
 164
 165 /* ------------------------------------------------------------------------ */
 166
 167 static void rb153_pata_setup_ports(struct ata_host *ah)
 168 {
 169         struct rb153_cf_info *info = ah->private_data;
 170         struct ata_port *ap;
 171         struct ata_ioports *iop;
 172
 173         ap = ah->ports[0];
 174         iop = &ap->ioaddr;
 175
 176         ap->ops         = &rb153_pata_port_ops;
 177         ap->pio_mask    = 0x1f; /* PIO4 */
 178         ap->flags       |= ATA_FLAG_MMIO | ATA_FLAG_NO_LEGACY;
 179
 180         iop->cmd_addr           = info->iobase + RB153_CF_REG_CMD;
 181         iop->ctl_addr           = info->iobase + RB153_CF_REG_CTRL;
 182         iop->altstatus_addr     = info->iobase + RB153_CF_REG_CTRL;
 183         iop->data_addr          = info->iobase + RB153_CF_REG_DATA;
 184
 185         ata_std_ports(iop);
 186 }
 187
 188 static __devinit int rb153_pata_driver_probe(struct platform_device *pdev)
 189 {
 190         unsigned int irq;
 191         int gpio;
 192         struct resource *res;
 193         struct ata_host *ah;
 194         struct rb153_cf_info *info;
 195         int ret;
 196
 197         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 198         if (!res) {
 199                 dev_err(&pdev->dev, "no IOMEM resource found\n");
 200                 return -EINVAL;
 201         }
 202
 203         irq = platform_get_irq(pdev, 0);
 204         if (irq <= 0) {
 205                 dev_err(&pdev->dev, "no IRQ resource found\n");
 206                 return -ENOENT;
 207         }
 208
 209         gpio = irq_to_gpio(irq);
 210         if (gpio < 0) {
 211                 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
 212                 return -ENOENT;
 213         }
 214
 215         ret = gpio_request(gpio, DRV_NAME);
 216         if (ret) {
 217                 dev_err(&pdev->dev, "GPIO request failed\n");
 218                 return ret;
 219         }
 220
 221         /* allocate host */
 222         ah = ata_host_alloc(&pdev->dev, RB153_CF_MAXPORTS);
 223         if (!ah)
 224                 return -ENOMEM;
 225
 226         platform_set_drvdata(pdev, ah);
 227
 228         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 229         if (!info)
 230                 return -ENOMEM;
 231
 232         ah->private_data = info;
 233
 234         info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
 235                                 res->end - res->start + 1);
 236         if (!info->iobase)
 237                 return -ENOMEM;
 238
 239         ret = gpio_direction_input(gpio);
 240         if (ret) {
 241                 dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
 242                                 ret);
 243                 goto err_free_gpio;
 244         }
 245
 246         rb153_pata_setup_ports(ah);
 247
 248         ret = ata_host_activate(ah, irq, ata_interrupt, IRQF_TRIGGER_HIGH,
 249                                 &rb153_pata_sht);
 250         if (ret)
 251                 goto err_free_gpio;
 252
 253         return 0;
 254
 255 err_free_gpio:
 256         gpio_free(gpio);
 257
 258         return ret;
 259 }
 260
 261 static __devexit int rb153_pata_driver_remove(struct platform_device *pdev)
 262 {
 263         struct ata_host *ah = platform_get_drvdata(pdev);
 264         struct rb153_cf_info *info = ah->private_data;
 265
 266         ata_host_detach(ah);
 267         gpio_free(info->gpio_line);
 268
 269         return 0;
 270 }
 271
 272 static struct platform_driver rb153_pata_platform_driver = {
 273         .probe          = rb153_pata_driver_probe,
 274         .remove         = __devexit_p(rb153_pata_driver_remove),
 275         .driver  = {
 276                 .name   = DRV_NAME,
 277                 .owner  = THIS_MODULE,
 278         },
 279 };
 280
 281 /* ------------------------------------------------------------------------ */
 282
 283 #define DRV_INFO DRV_DESC " version " DRV_VERSION
 284
 285 static int __init rb153_pata_module_init(void)
 286 {
 287         printk(KERN_INFO DRV_INFO "\n");
 288
 289         return platform_driver_register(&rb153_pata_platform_driver);
 290 }
 291
 292 static void __exit rb153_pata_module_exit(void)
 293 {
 294         platform_driver_unregister(&rb153_pata_platform_driver);
 295 }
 296
 297 MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
 298 MODULE_DESCRIPTION(DRV_DESC);
 299 MODULE_VERSION(DRV_VERSION);
 300 MODULE_LICENSE("GPL");
 301
 302 module_init(rb153_pata_module_init);
 303 module_exit(rb153_pata_module_exit);