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     "0.2.2"
  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             frozen;
  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         void __iomem *ioaddr = adev->ap->ioaddr.data_addr;
  74
  75         if (write_data) {
  76                 for (; buflen > 0; buflen--, buf++)
  77                         writeb(*buf, ioaddr);
  78         } else {
  79                 for (; buflen > 0; buflen--, buf++)
  80                         *buf = readb(ioaddr);
  81         }
  82
  83         rb153_pata_finish_io(adev->ap);
  84 }
  85
  86 static void rb153_pata_freeze(struct ata_port *ap)
  87 {
  88         struct rb153_cf_info *info = ap->host->private_data;
  89
  90         info->frozen = 1;
  91 }
  92
  93 static void rb153_pata_thaw(struct ata_port *ap)
  94 {
  95         struct rb153_cf_info *info = ap->host->private_data;
  96
  97         info->frozen = 0;
  98 }
  99
 100 static irqreturn_t rb153_pata_irq_handler(int irq, void *dev_instance)
 101 {
 102         struct ata_host *ah = dev_instance;
 103         struct rb153_cf_info *info = ah->private_data;
 104
 105         if (gpio_get_value(info->gpio_line)) {
 106                 set_irq_type(ah->irq, IRQ_TYPE_LEVEL_LOW);
 107                 if (!info->frozen)
 108                         ata_interrupt(irq, dev_instance);
 109         } else {
 110                 set_irq_type(ah->irq, IRQ_TYPE_LEVEL_HIGH);
 111         }
 112
 113         return IRQ_HANDLED;
 114 }
 115
 116 static void rb153_pata_irq_clear(struct ata_port *ap)
 117 {
 118 }
 119
 120 static int rb153_pata_port_start(struct ata_port *ap)
 121 {
 122         return 0;
 123 }
 124
 125 static struct ata_port_operations rb153_pata_port_ops = {
 126         .port_disable           = ata_port_disable,
 127
 128         .tf_load                = ata_tf_load,
 129         .tf_read                = ata_tf_read,
 130
 131         .exec_command           = rb153_pata_exec_command,
 132         .check_status           = ata_check_status,
 133         .dev_select             = ata_std_dev_select,
 134
 135         .data_xfer              = rb153_pata_data_xfer,
 136
 137         .qc_prep                = ata_qc_prep,
 138         .qc_issue               = ata_qc_issue_prot,
 139
 140         .freeze                 = rb153_pata_freeze,
 141         .thaw                   = rb153_pata_thaw,
 142         .error_handler          = ata_bmdma_error_handler,
 143
 144         .irq_handler            = rb153_pata_irq_handler,
 145         .irq_clear              = rb153_pata_irq_clear,
 146         .irq_on                 = ata_irq_on,
 147
 148         .port_start             = rb153_pata_port_start,
 149 };
 150
 151 /* ------------------------------------------------------------------------ */
 152
 153 static struct scsi_host_template rb153_pata_sht = {
 154         .module                 = THIS_MODULE,
 155         .name                   = DRV_NAME,
 156         .ioctl                  = ata_scsi_ioctl,
 157         .queuecommand           = ata_scsi_queuecmd,
 158         .slave_configure        = ata_scsi_slave_config,
 159         .slave_destroy          = ata_scsi_slave_destroy,
 160         .bios_param             = ata_std_bios_param,
 161         .proc_name              = DRV_NAME,
 162
 163         .can_queue              = ATA_DEF_QUEUE,
 164         .this_id                = ATA_SHT_THIS_ID,
 165         .sg_tablesize           = LIBATA_MAX_PRD,
 166         .dma_boundary           = ATA_DMA_BOUNDARY,
 167         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
 168         .emulated               = ATA_SHT_EMULATED,
 169         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 170 };
 171
 172 /* ------------------------------------------------------------------------ */
 173
 174 static void rb153_pata_setup_ports(struct ata_host *ah)
 175 {
 176         struct rb153_cf_info *info = ah->private_data;
 177         struct ata_port *ap;
 178
 179         ap = ah->ports[0];
 180
 181         ap->ops         = &rb153_pata_port_ops;
 182         ap->pio_mask    = 0x1f; /* PIO4 */
 183         ap->flags       = ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO;
 184
 185         ap->ioaddr.cmd_addr     = info->iobase + RB153_CF_REG_CMD;
 186         ap->ioaddr.ctl_addr     = info->iobase + RB153_CF_REG_CTRL;
 187         ap->ioaddr.altstatus_addr = info->iobase + RB153_CF_REG_CTRL;
 188
 189         ata_std_ports(&ap->ioaddr);
 190
 191         ap->ioaddr.data_addr    = info->iobase + RB153_CF_REG_DATA;
 192 }
 193
 194 static __devinit int rb153_pata_driver_probe(struct platform_device *pdev)
 195 {
 196         unsigned int irq;
 197         int gpio;
 198         struct resource *res;
 199         struct ata_host *ah;
 200         struct rb153_cf_info *info;
 201         int ret;
 202
 203         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 204         if (!res) {
 205                 dev_err(&pdev->dev, "no IOMEM resource found\n");
 206                 return -EINVAL;
 207         }
 208
 209         irq = platform_get_irq(pdev, 0);
 210         if (irq <= 0) {
 211                 dev_err(&pdev->dev, "no IRQ resource found\n");
 212                 return -ENOENT;
 213         }
 214
 215         gpio = irq_to_gpio(irq);
 216         if (gpio < 0) {
 217                 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
 218                 return -ENOENT;
 219         }
 220
 221         ret = gpio_request(gpio, DRV_NAME);
 222         if (ret) {
 223                 dev_err(&pdev->dev, "GPIO request failed\n");
 224                 return ret;
 225         }
 226
 227         /* allocate host */
 228         ah = ata_host_alloc(&pdev->dev, RB153_CF_MAXPORTS);
 229         if (!ah)
 230                 return -ENOMEM;
 231
 232         platform_set_drvdata(pdev, ah);
 233
 234         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 235         if (!info)
 236                 return -ENOMEM;
 237
 238         ah->private_data = info;
 239         info->gpio_line = gpio;
 240
 241         info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
 242                                 res->end - res->start + 1);
 243         if (!info->iobase)
 244                 return -ENOMEM;
 245
 246         ret = gpio_direction_input(gpio);
 247         if (ret) {
 248                 dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
 249                                 ret);
 250                 goto err_free_gpio;
 251         }
 252
 253         rb153_pata_setup_ports(ah);
 254
 255         ret = ata_host_activate(ah, irq, rb153_pata_irq_handler,
 256                                 IRQF_TRIGGER_LOW, &rb153_pata_sht);
 257         if (ret)
 258                 goto err_free_gpio;
 259
 260         return 0;
 261
 262 err_free_gpio:
 263         gpio_free(gpio);
 264
 265         return ret;
 266 }
 267
 268 static __devexit int rb153_pata_driver_remove(struct platform_device *pdev)
 269 {
 270         struct ata_host *ah = platform_get_drvdata(pdev);
 271         struct rb153_cf_info *info = ah->private_data;
 272
 273         ata_host_detach(ah);
 274         gpio_free(info->gpio_line);
 275
 276         return 0;
 277 }
 278
 279 static struct platform_driver rb153_pata_platform_driver = {
 280         .probe          = rb153_pata_driver_probe,
 281         .remove         = __devexit_p(rb153_pata_driver_remove),
 282         .driver  = {
 283                 .name   = DRV_NAME,
 284                 .owner  = THIS_MODULE,
 285         },
 286 };
 287
 288 /* ------------------------------------------------------------------------ */
 289
 290 #define DRV_INFO DRV_DESC " version " DRV_VERSION
 291
 292 static int __init rb153_pata_module_init(void)
 293 {
 294         printk(KERN_INFO DRV_INFO "\n");
 295
 296         return platform_driver_register(&rb153_pata_platform_driver);
 297 }
 298
 299 static void __exit rb153_pata_module_exit(void)
 300 {
 301         platform_driver_unregister(&rb153_pata_platform_driver);
 302 }
 303
 304 MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
 305 MODULE_DESCRIPTION(DRV_DESC);
 306 MODULE_VERSION(DRV_VERSION);
 307 MODULE_LICENSE("GPL");
 308
 309 module_init(rb153_pata_module_init);
 310 module_exit(rb153_pata_module_exit);