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) 2007,2008 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 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/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     "0.4.0"
  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         unsigned int    irq;
  47         void __iomem    *iobase;
  48         unsigned int    gpio_line;
  49         int             frozen;
  50 };
  51
  52 /* ------------------------------------------------------------------------ */
  53
  54 static inline void rb153_pata_finish_io(struct ata_port *ap)
  55 {
  56         struct rb153_cf_info *info = ap->host->private_data;
  57
  58         ata_altstatus(ap);
  59         ndelay(RB153_CF_IO_DELAY);
  60
  61         set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
  62 }
  63
  64 static void rb153_pata_exec_command(struct ata_port *ap,
  65                                 const struct ata_taskfile *tf)
  66 {
  67         writeb(tf->command, ap->ioaddr.command_addr);
  68         rb153_pata_finish_io(ap);
  69 }
  70
  71 static void rb153_pata_data_xfer(struct ata_device *adev, unsigned char *buf,
  72                                 unsigned int buflen, int write_data)
  73 {
  74         void __iomem *ioaddr = adev->link->ap->ioaddr.data_addr;
  75
  76         if (write_data) {
  77                 for (; buflen > 0; buflen--, buf++)
  78                         writeb(*buf, ioaddr);
  79         } else {
  80                 for (; buflen > 0; buflen--, buf++)
  81                         *buf = readb(ioaddr);
  82         }
  83
  84         rb153_pata_finish_io(adev->link->ap);
  85 }
  86
  87 static void rb153_pata_freeze(struct ata_port *ap)
  88 {
  89         struct rb153_cf_info *info = ap->host->private_data;
  90
  91         info->frozen = 1;
  92 }
  93
  94 static void rb153_pata_thaw(struct ata_port *ap)
  95 {
  96         struct rb153_cf_info *info = ap->host->private_data;
  97
  98         info->frozen = 0;
  99 }
 100
 101 static irqreturn_t rb153_pata_irq_handler(int irq, void *dev_instance)
 102 {
 103         struct ata_host *ah = dev_instance;
 104         struct rb153_cf_info *info = ah->private_data;
 105
 106         if (gpio_get_value(info->gpio_line)) {
 107                 set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
 108                 if (!info->frozen)
 109                         ata_interrupt(irq, dev_instance);
 110         } else {
 111                 set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
 112         }
 113
 114         return IRQ_HANDLED;
 115 }
 116
 117 static void rb153_pata_irq_clear(struct ata_port *ap)
 118 {
 119 }
 120
 121 static int rb153_pata_port_start(struct ata_port *ap)
 122 {
 123         return 0;
 124 }
 125
 126 static struct ata_port_operations rb153_pata_port_ops = {
 127         .tf_load                = ata_tf_load,
 128         .tf_read                = ata_tf_read,
 129
 130         .exec_command           = rb153_pata_exec_command,
 131         .check_status           = ata_check_status,
 132         .dev_select             = ata_std_dev_select,
 133
 134         .data_xfer              = rb153_pata_data_xfer,
 135
 136         .qc_prep                = ata_qc_prep,
 137         .qc_issue               = ata_qc_issue_prot,
 138
 139         .freeze                 = rb153_pata_freeze,
 140         .thaw                   = rb153_pata_thaw,
 141         .error_handler          = ata_bmdma_error_handler,
 142         .cable_detect           = ata_cable_40wire,
 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_port(struct ata_port *ap,
 175                         struct rb153_cf_info *info, unsigned long raw_cmd)
 176 {
 177         ap->ioaddr.cmd_addr     = info->iobase + RB153_CF_REG_CMD;
 178         ap->ioaddr.ctl_addr     = info->iobase + RB153_CF_REG_CTRL;
 179         ap->ioaddr.altstatus_addr = info->iobase + RB153_CF_REG_CTRL;
 180
 181         ata_std_ports(&ap->ioaddr);
 182
 183         ap->ioaddr.data_addr    = info->iobase + RB153_CF_REG_DATA;
 184
 185         ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", raw_cmd,
 186                                 raw_cmd + RB153_CF_REG_CTRL);
 187 }
 188
 189 static __devinit int rb153_pata_driver_probe(struct platform_device *pdev)
 190 {
 191         unsigned int irq;
 192         int gpio;
 193         struct resource *res;
 194         struct ata_host *ah;
 195         struct ata_port *ap;
 196         struct rb153_cf_info *info;
 197         int ret;
 198
 199         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 200         if (!res) {
 201                 dev_err(&pdev->dev, "no IOMEM resource found\n");
 202                 return -EINVAL;
 203         }
 204
 205         irq = platform_get_irq(pdev, 0);
 206         if (irq <= 0) {
 207                 dev_err(&pdev->dev, "no IRQ resource found\n");
 208                 return -ENOENT;
 209         }
 210
 211         gpio = irq_to_gpio(irq);
 212         if (gpio < 0) {
 213                 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
 214                 return -ENOENT;
 215         }
 216
 217         ret = gpio_request(gpio, DRV_NAME);
 218         if (ret) {
 219                 dev_err(&pdev->dev, "GPIO request failed\n");
 220                 return ret;
 221         }
 222
 223         /* allocate host */
 224         ah = ata_host_alloc(&pdev->dev, RB153_CF_MAXPORTS);
 225         if (!ah)
 226                 return -ENOMEM;
 227
 228         platform_set_drvdata(pdev, ah);
 229
 230         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 231         if (!info)
 232                 return -ENOMEM;
 233
 234         ah->private_data = info;
 235         info->gpio_line = gpio;
 236         info->irq = irq;
 237
 238         info->iobase = devm_ioremap_nocache(&pdev->dev, res->start,
 239                                 res->end - res->start + 1);
 240         if (!info->iobase)
 241                 return -ENOMEM;
 242
 243         ret = gpio_direction_input(gpio);
 244         if (ret) {
 245                 dev_err(&pdev->dev, "unable to set GPIO direction, err=%d\n",
 246                                 ret);
 247                 goto err_free_gpio;
 248         }
 249
 250         ap = ah->ports[0];
 251
 252         ap->ops         = &rb153_pata_port_ops;
 253         ap->pio_mask    = 0x1f; /* PIO4 */
 254         ap->flags       = ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO;
 255
 256         rb153_pata_setup_port(ap, info, res->start);
 257
 258         ret = ata_host_activate(ah, irq, rb153_pata_irq_handler,
 259                                 IRQF_TRIGGER_LOW, &rb153_pata_sht);
 260         if (ret)
 261                 goto err_free_gpio;
 262
 263         return 0;
 264
 265 err_free_gpio:
 266         gpio_free(gpio);
 267
 268         return ret;
 269 }
 270
 271 static __devexit int rb153_pata_driver_remove(struct platform_device *pdev)
 272 {
 273         struct ata_host *ah = platform_get_drvdata(pdev);
 274         struct rb153_cf_info *info = ah->private_data;
 275
 276         ata_host_detach(ah);
 277         gpio_free(info->gpio_line);
 278
 279         return 0;
 280 }
 281
 282 static struct platform_driver rb153_pata_platform_driver = {
 283         .probe          = rb153_pata_driver_probe,
 284         .remove         = __devexit_p(rb153_pata_driver_remove),
 285         .driver  = {
 286                 .name   = DRV_NAME,
 287                 .owner  = THIS_MODULE,
 288         },
 289 };
 290
 291 /* ------------------------------------------------------------------------ */
 292
 293 #define DRV_INFO DRV_DESC " version " DRV_VERSION
 294
 295 static int __init rb153_pata_module_init(void)
 296 {
 297         printk(KERN_INFO DRV_INFO "\n");
 298
 299         return platform_driver_register(&rb153_pata_platform_driver);
 300 }
 301
 302 static void __exit rb153_pata_module_exit(void)
 303 {
 304         platform_driver_unregister(&rb153_pata_platform_driver);
 305 }
 306
 307 MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
 308 MODULE_DESCRIPTION(DRV_DESC);
 309 MODULE_VERSION(DRV_VERSION);
 310 MODULE_LICENSE("GPL v2");
 311
 312 module_init(rb153_pata_module_init);
 313 module_exit(rb153_pata_module_exit);