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 unsigned int 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         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                 set_irq_type(info->irq, IRQ_TYPE_LEVEL_LOW);
 111                 if (!info->frozen)
 112                         ata_interrupt(irq, dev_instance);
 113         } else {
 114                 set_irq_type(info->irq, IRQ_TYPE_LEVEL_HIGH);
 115         }
 116
 117         return IRQ_HANDLED;
 118 }
 119
 120 static void rb153_pata_irq_clear(struct ata_port *ap)
 121 {
 122 }
 123
 124 static int rb153_pata_port_start(struct ata_port *ap)
 125 {
 126         return 0;
 127 }
 128
 129 static struct ata_port_operations rb153_pata_port_ops = {
 130         .tf_load                = ata_tf_load,
 131         .tf_read                = ata_tf_read,
 132
 133         .exec_command           = rb153_pata_exec_command,
 134         .check_status           = ata_check_status,
 135         .dev_select             = ata_std_dev_select,
 136
 137         .data_xfer              = rb153_pata_data_xfer,
 138
 139         .qc_prep                = ata_qc_prep,
 140         .qc_issue               = ata_qc_issue_prot,
 141
 142         .freeze                 = rb153_pata_freeze,
 143         .thaw                   = rb153_pata_thaw,
 144         .error_handler          = ata_bmdma_error_handler,
 145         .cable_detect           = ata_cable_40wire,
 146
 147         .irq_handler            = rb153_pata_irq_handler,
 148         .irq_clear              = rb153_pata_irq_clear,
 149         .irq_on                 = ata_irq_on,
 150
 151         .port_start             = rb153_pata_port_start,
 152 };
 153
 154 /* ------------------------------------------------------------------------ */
 155
 156 static struct scsi_host_template rb153_pata_sht = {
 157         .module                 = THIS_MODULE,
 158         .name                   = DRV_NAME,
 159         .ioctl                  = ata_scsi_ioctl,
 160         .queuecommand           = ata_scsi_queuecmd,
 161         .slave_configure        = ata_scsi_slave_config,
 162         .slave_destroy          = ata_scsi_slave_destroy,
 163         .bios_param             = ata_std_bios_param,
 164         .proc_name              = DRV_NAME,
 165
 166         .can_queue              = ATA_DEF_QUEUE,
 167         .this_id                = ATA_SHT_THIS_ID,
 168         .sg_tablesize           = LIBATA_MAX_PRD,
 169         .dma_boundary           = ATA_DMA_BOUNDARY,
 170         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
 171         .emulated               = ATA_SHT_EMULATED,
 172         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 173 };
 174
 175 /* ------------------------------------------------------------------------ */
 176
 177 static void rb153_pata_setup_port(struct ata_port *ap,
 178                         struct rb153_cf_info *info, unsigned long raw_cmd)
 179 {
 180         ap->ioaddr.cmd_addr     = info->iobase + RB153_CF_REG_CMD;
 181         ap->ioaddr.ctl_addr     = info->iobase + RB153_CF_REG_CTRL;
 182         ap->ioaddr.altstatus_addr = info->iobase + RB153_CF_REG_CTRL;
 183
 184         ata_std_ports(&ap->ioaddr);
 185
 186         ap->ioaddr.data_addr    = info->iobase + RB153_CF_REG_DATA;
 187
 188         ata_port_desc(ap, "cmd 0x%lx ctl 0x%lx", raw_cmd,
 189                                 raw_cmd + RB153_CF_REG_CTRL);
 190 }
 191
 192 static __devinit int rb153_pata_driver_probe(struct platform_device *pdev)
 193 {
 194         unsigned int irq;
 195         int gpio;
 196         struct resource *res;
 197         struct ata_host *ah;
 198         struct ata_port *ap;
 199         struct rb153_cf_info *info;
 200         int ret;
 201
 202         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 203         if (!res) {
 204                 dev_err(&pdev->dev, "no IOMEM resource found\n");
 205                 return -EINVAL;
 206         }
 207
 208         irq = platform_get_irq(pdev, 0);
 209         if (irq <= 0) {
 210                 dev_err(&pdev->dev, "no IRQ resource found\n");
 211                 return -ENOENT;
 212         }
 213
 214         gpio = irq_to_gpio(irq);
 215         if (gpio < 0) {
 216                 dev_err(&pdev->dev, "no GPIO found for irq%d\n", irq);
 217                 return -ENOENT;
 218         }
 219
 220         ret = gpio_request(gpio, DRV_NAME);
 221         if (ret) {
 222                 dev_err(&pdev->dev, "GPIO request failed\n");
 223                 return ret;
 224         }
 225
 226         /* allocate host */
 227         ah = ata_host_alloc(&pdev->dev, RB153_CF_MAXPORTS);
 228         if (!ah)
 229                 return -ENOMEM;
 230
 231         platform_set_drvdata(pdev, ah);
 232
 233         info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
 234         if (!info)
 235                 return -ENOMEM;
 236
 237         ah->private_data = info;
 238         info->gpio_line = gpio;
 239         info->irq = irq;
 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         ap = ah->ports[0];
 254
 255         ap->ops         = &rb153_pata_port_ops;
 256         ap->pio_mask    = 0x1f; /* PIO4 */
 257         ap->flags       = ATA_FLAG_NO_LEGACY | ATA_FLAG_MMIO;
 258
 259         rb153_pata_setup_port(ap, info, res->start);
 260
 261         ret = ata_host_activate(ah, irq, rb153_pata_irq_handler,
 262                                 IRQF_TRIGGER_LOW, &rb153_pata_sht);
 263         if (ret)
 264                 goto err_free_gpio;
 265
 266         return 0;
 267
 268 err_free_gpio:
 269         gpio_free(gpio);
 270
 271         return ret;
 272 }
 273
 274 static __devexit int rb153_pata_driver_remove(struct platform_device *pdev)
 275 {
 276         struct ata_host *ah = platform_get_drvdata(pdev);
 277         struct rb153_cf_info *info = ah->private_data;
 278
 279         ata_host_detach(ah);
 280         gpio_free(info->gpio_line);
 281
 282         return 0;
 283 }
 284
 285 static struct platform_driver rb153_pata_platform_driver = {
 286         .probe          = rb153_pata_driver_probe,
 287         .remove         = __devexit_p(rb153_pata_driver_remove),
 288         .driver  = {
 289                 .name   = DRV_NAME,
 290                 .owner  = THIS_MODULE,
 291         },
 292 };
 293
 294 /* ------------------------------------------------------------------------ */
 295
 296 #define DRV_INFO DRV_DESC " version " DRV_VERSION
 297
 298 static int __init rb153_pata_module_init(void)
 299 {
 300         printk(KERN_INFO DRV_INFO "\n");
 301
 302         return platform_driver_register(&rb153_pata_platform_driver);
 303 }
 304
 305 static void __exit rb153_pata_module_exit(void)
 306 {
 307         platform_driver_unregister(&rb153_pata_platform_driver);
 308 }
 309
 310 MODULE_AUTHOR("Gabor Juhos <juhosg at openwrt.org>");
 311 MODULE_DESCRIPTION(DRV_DESC);
 312 MODULE_VERSION(DRV_VERSION);
 313 MODULE_LICENSE("GPL v2");
 314
 315 module_init(rb153_pata_module_init);
 316 module_exit(rb153_pata_module_exit);