drivers/ata/pata_at32.c

   1 /*
   2  * AVR32 SMC/CFC PATA Driver
   3  *
   4  * Copyright (C) 2007 Atmel Norway
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License version
   8  * 2 as published by the Free Software Foundation.
   9  */
  10
  11 #define DEBUG
  12
  13 #include <linux/kernel.h>
  14 #include <linux/module.h>
  15 #include <linux/init.h>
  16 #include <linux/device.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/delay.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/irq.h>
  21 #include <linux/slab.h>
  22 #include <scsi/scsi_host.h>
  23 #include <linux/ata.h>
  24 #include <linux/libata.h>
  25 #include <linux/err.h>
  26 #include <linux/io.h>
  27
  28 #include <mach/board.h>
  29 #include <mach/smc.h>
  30
  31 #define DRV_NAME "pata_at32"
  32 #define DRV_VERSION "0.0.3"
  33
  34 /*
  35  * CompactFlash controller memory layout relative to the base address:
  36  *
  37  *      Attribute memory:  0000 0000 -> 003f ffff
  38  *      Common memory:     0040 0000 -> 007f ffff
  39  *      I/O memory:        0080 0000 -> 00bf ffff
  40  *      True IDE Mode:     00c0 0000 -> 00df ffff
  41  *      Alt IDE Mode:      00e0 0000 -> 00ff ffff
  42  *
  43  * Only True IDE and Alt True IDE mode are needed for this driver.
  44  *
  45  *      True IDE mode     => CS0 = 0, CS1 = 1 (cmd, error, stat, etc)
  46  *      Alt True IDE mode => CS0 = 1, CS1 = 0 (ctl, alt_stat)
  47  */
  48 #define CF_IDE_OFFSET     0x00c00000
  49 #define CF_ALT_IDE_OFFSET 0x00e00000
  50 #define CF_RES_SIZE       2048
  51
  52 /*
  53  * Define DEBUG_BUS if you are doing debugging of your own EBI -> PATA
  54  * adaptor with a logic analyzer or similar.
  55  */
  56 #undef DEBUG_BUS
  57
  58 /*
  59  * ATA PIO modes
  60  *
  61  *      Name    | Mb/s  | Min cycle time | Mask
  62  *      --------+-------+----------------+--------
  63  *      Mode 0  | 3.3   | 600 ns         | 0x01
  64  *      Mode 1  | 5.2   | 383 ns         | 0x03
  65  *      Mode 2  | 8.3   | 240 ns         | 0x07
  66  *      Mode 3  | 11.1  | 180 ns         | 0x0f
  67  *      Mode 4  | 16.7  | 120 ns         | 0x1f
  68  *
  69  * Alter PIO_MASK below according to table to set maximal PIO mode.
  70  */
  71 enum {
  72   PIO_MASK = ATA_PIO4,
  73 };
  74
  75 /*
  76  * Struct containing private information about device.
  77  */
  78 struct at32_ide_info {
  79         unsigned int            irq;
  80         struct resource         res_ide;
  81         struct resource         res_alt;
  82         void __iomem            *ide_addr;
  83         void __iomem            *alt_addr;
  84         unsigned int            cs;
  85         struct smc_config       smc;
  86 };
  87
  88 /*
  89  * Setup SMC for the given ATA timing.
  90  */
  91 static int pata_at32_setup_timing(struct device *dev,
  92                                   struct at32_ide_info *info,
  93                                   const struct ata_timing *ata)
  94 {
  95         struct smc_config *smc = &info->smc;
  96         struct smc_timing timing;
  97
  98         int active;
  99         int recover;
 100
 101         memset(&timing, 0, sizeof(struct smc_timing));
 102
 103         /* Total cycle time */
 104         timing.read_cycle  = ata->cyc8b;
 105
 106         /* DIOR <= CFIOR timings */
 107         timing.nrd_setup   = ata->setup;
 108         timing.nrd_pulse   = ata->act8b;
 109         timing.nrd_recover = ata->rec8b;
 110
 111         /* Convert nanosecond timing to clock cycles */
 112         smc_set_timing(smc, &timing);
 113
 114         /* Add one extra cycle setup due to signal ring */
 115         smc->nrd_setup = smc->nrd_setup + 1;
 116
 117         active  = smc->nrd_setup + smc->nrd_pulse;
 118         recover = smc->read_cycle - active;
 119
 120         /* Need at least two cycles recovery */
 121         if (recover < 2)
 122           smc->read_cycle = active + 2;
 123
 124         /* (CS0, CS1, DIR, OE) <= (CFCE1, CFCE2, CFRNW, NCSX) timings */
 125         smc->ncs_read_setup = 1;
 126         smc->ncs_read_pulse = smc->read_cycle - 2;
 127
 128         /* Write timings same as read timings */
 129         smc->write_cycle = smc->read_cycle;
 130         smc->nwe_setup = smc->nrd_setup;
 131         smc->nwe_pulse = smc->nrd_pulse;
 132         smc->ncs_write_setup = smc->ncs_read_setup;
 133         smc->ncs_write_pulse = smc->ncs_read_pulse;
 134
 135         /* Do some debugging output of ATA and SMC timings */
 136         dev_dbg(dev, "ATA: C=%d S=%d P=%d R=%d\n",
 137                 ata->cyc8b, ata->setup, ata->act8b, ata->rec8b);
 138
 139         dev_dbg(dev, "SMC: C=%d S=%d P=%d NS=%d NP=%d\n",
 140                 smc->read_cycle, smc->nrd_setup, smc->nrd_pulse,
 141                 smc->ncs_read_setup, smc->ncs_read_pulse);
 142
 143         /* Finally, configure the SMC */
 144         return smc_set_configuration(info->cs, smc);
 145 }
 146
 147 /*
 148  * Procedures for libATA.
 149  */
 150 static void pata_at32_set_piomode(struct ata_port *ap, struct ata_device *adev)
 151 {
 152         struct ata_timing timing;
 153         struct at32_ide_info *info = ap->host->private_data;
 154
 155         int ret;
 156
 157         /* Compute ATA timing */
 158         ret = ata_timing_compute(adev, adev->pio_mode, &timing, 1000, 0);
 159         if (ret) {
 160                 dev_warn(ap->dev, "Failed to compute ATA timing %d\n", ret);
 161                 return;
 162         }
 163
 164         /* Setup SMC to ATA timing */
 165         ret = pata_at32_setup_timing(ap->dev, info, &timing);
 166         if (ret) {
 167                 dev_warn(ap->dev, "Failed to setup ATA timing %d\n", ret);
 168                 return;
 169         }
 170 }
 171
 172 static struct scsi_host_template at32_sht = {
 173         ATA_PIO_SHT(DRV_NAME),
 174 };
 175
 176 static struct ata_port_operations at32_port_ops = {
 177         .inherits               = &ata_sff_port_ops,
 178         .cable_detect           = ata_cable_40wire,
 179         .set_piomode            = pata_at32_set_piomode,
 180 };
 181
 182 static int __init pata_at32_init_one(struct device *dev,
 183                                      struct at32_ide_info *info)
 184 {
 185         struct ata_host *host;
 186         struct ata_port *ap;
 187
 188         host = ata_host_alloc(dev, 1);
 189         if (!host)
 190                 return -ENOMEM;
 191
 192         ap = host->ports[0];
 193
 194         /* Setup ATA bindings */
 195         ap->ops      = &at32_port_ops;
 196         ap->pio_mask = PIO_MASK;
 197         ap->flags   |= ATA_FLAG_SLAVE_POSS;
 198
 199         /*
 200          * Since all 8-bit taskfile transfers has to go on the lower
 201          * byte of the data bus and there is a bug in the SMC that
 202          * makes it impossible to alter the bus width during runtime,
 203          * we need to hardwire the address signals as follows:
 204          *
 205          *      A_IDE(2:0) <= A_EBI(3:1)
 206          *
 207          * This makes all addresses on the EBI even, thus all data
 208          * will be on the lower byte of the data bus.  All addresses
 209          * used by libATA need to be altered according to this.
 210          */
 211         ap->ioaddr.altstatus_addr = info->alt_addr + (0x06 << 1);
 212         ap->ioaddr.ctl_addr       = info->alt_addr + (0x06 << 1);
 213
 214         ap->ioaddr.data_addr      = info->ide_addr + (ATA_REG_DATA << 1);
 215         ap->ioaddr.error_addr     = info->ide_addr + (ATA_REG_ERR << 1);
 216         ap->ioaddr.feature_addr   = info->ide_addr + (ATA_REG_FEATURE << 1);
 217         ap->ioaddr.nsect_addr     = info->ide_addr + (ATA_REG_NSECT << 1);
 218         ap->ioaddr.lbal_addr      = info->ide_addr + (ATA_REG_LBAL << 1);
 219         ap->ioaddr.lbam_addr      = info->ide_addr + (ATA_REG_LBAM << 1);
 220         ap->ioaddr.lbah_addr      = info->ide_addr + (ATA_REG_LBAH << 1);
 221         ap->ioaddr.device_addr    = info->ide_addr + (ATA_REG_DEVICE << 1);
 222         ap->ioaddr.status_addr    = info->ide_addr + (ATA_REG_STATUS << 1);
 223         ap->ioaddr.command_addr   = info->ide_addr + (ATA_REG_CMD << 1);
 224
 225         /* Set info as private data of ATA host */
 226         host->private_data = info;
 227
 228         /* Register ATA device and return */
 229         return ata_host_activate(host, info->irq, ata_sff_interrupt,
 230                                  IRQF_SHARED | IRQF_TRIGGER_RISING,
 231                                  &at32_sht);
 232 }
 233
 234 /*
 235  * This function may come in handy for people analyzing their own
 236  * EBI -> PATA adaptors.
 237  */
 238 #ifdef DEBUG_BUS
 239
 240 static void __init pata_at32_debug_bus(struct device *dev,
 241                                        struct at32_ide_info *info)
 242 {
 243         const int d1 = 0xff;
 244         const int d2 = 0x00;
 245
 246         int i;
 247
 248         /* Write 8-bit values (registers) */
 249         iowrite8(d1, info->alt_addr + (0x06 << 1));
 250         iowrite8(d2, info->alt_addr + (0x06 << 1));
 251
 252         for (i = 0; i < 8; i++) {
 253                 iowrite8(d1, info->ide_addr + (i << 1));
 254                 iowrite8(d2, info->ide_addr + (i << 1));
 255         }
 256
 257         /* Write 16 bit values (data) */
 258         iowrite16(d1,      info->ide_addr);
 259         iowrite16(d1 << 8, info->ide_addr);
 260
 261         iowrite16(d1,      info->ide_addr);
 262         iowrite16(d1 << 8, info->ide_addr);
 263 }
 264
 265 #endif
 266
 267 static int __init pata_at32_probe(struct platform_device *pdev)
 268 {
 269         const struct ata_timing initial_timing =
 270                 {XFER_PIO_0, 70, 290, 240, 600, 165, 150, 600, 0};
 271
 272         struct device            *dev = &pdev->dev;
 273         struct at32_ide_info     *info;
 274         struct ide_platform_data *board = dev_get_platdata(&pdev->dev);
 275         struct resource          *res;
 276
 277         int irq;
 278         int ret;
 279
 280         if (!board)
 281                 return -ENXIO;
 282
 283         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 284         if (!res)
 285                 return -ENXIO;
 286
 287         /* Retrive IRQ */
 288         irq = platform_get_irq(pdev, 0);
 289         if (irq < 0)
 290                 return irq;
 291
 292         /* Setup struct containing private information */
 293         info = kzalloc(sizeof(struct at32_ide_info), GFP_KERNEL);
 294         if (!info)
 295                 return -ENOMEM;
 296
 297         info->irq = irq;
 298         info->cs  = board->cs;
 299
 300         /* Request memory resources */
 301         info->res_ide.start = res->start + CF_IDE_OFFSET;
 302         info->res_ide.end   = info->res_ide.start + CF_RES_SIZE - 1;
 303         info->res_ide.name  = "ide";
 304         info->res_ide.flags = IORESOURCE_MEM;
 305
 306         ret = request_resource(res, &info->res_ide);
 307         if (ret)
 308                 goto err_req_res_ide;
 309
 310         info->res_alt.start = res->start + CF_ALT_IDE_OFFSET;
 311         info->res_alt.end   = info->res_alt.start + CF_RES_SIZE - 1;
 312         info->res_alt.name  = "alt";
 313         info->res_alt.flags = IORESOURCE_MEM;
 314
 315         ret = request_resource(res, &info->res_alt);
 316         if (ret)
 317                 goto err_req_res_alt;
 318
 319         /* Setup non-timing elements of SMC */
 320         info->smc.bus_width      = 2; /* 16 bit data bus */
 321         info->smc.nrd_controlled = 1; /* Sample data on rising edge of NRD */
 322         info->smc.nwe_controlled = 0; /* Drive data on falling edge of NCS */
 323         info->smc.nwait_mode     = 3; /* NWAIT is in READY mode */
 324         info->smc.byte_write     = 0; /* Byte select access type */
 325         info->smc.tdf_mode       = 0; /* TDF optimization disabled */
 326         info->smc.tdf_cycles     = 0; /* No TDF wait cycles */
 327
 328         /* Setup SMC to ATA timing */
 329         ret = pata_at32_setup_timing(dev, info, &initial_timing);
 330         if (ret)
 331                 goto err_setup_timing;
 332
 333         /* Map ATA address space */
 334         ret = -ENOMEM;
 335         info->ide_addr = devm_ioremap(dev, info->res_ide.start, 16);
 336         info->alt_addr = devm_ioremap(dev, info->res_alt.start, 16);
 337         if (!info->ide_addr || !info->alt_addr)
 338                 goto err_ioremap;
 339
 340 #ifdef DEBUG_BUS
 341         pata_at32_debug_bus(dev, info);
 342 #endif
 343
 344         /* Setup and register ATA device */
 345         ret = pata_at32_init_one(dev, info);
 346         if (ret)
 347                 goto err_ata_device;
 348
 349         return 0;
 350
 351  err_ata_device:
 352  err_ioremap:
 353  err_setup_timing:
 354         release_resource(&info->res_alt);
 355  err_req_res_alt:
 356         release_resource(&info->res_ide);
 357  err_req_res_ide:
 358         kfree(info);
 359
 360         return ret;
 361 }
 362
 363 static int __exit pata_at32_remove(struct platform_device *pdev)
 364 {
 365         struct ata_host *host = platform_get_drvdata(pdev);
 366         struct at32_ide_info *info;
 367
 368         if (!host)
 369                 return 0;
 370
 371         info = host->private_data;
 372         ata_host_detach(host);
 373
 374         if (!info)
 375                 return 0;
 376
 377         release_resource(&info->res_ide);
 378         release_resource(&info->res_alt);
 379
 380         kfree(info);
 381
 382         return 0;
 383 }
 384
 385 /* work with hotplug and coldplug */
 386 MODULE_ALIAS("platform:at32_ide");
 387
 388 static struct platform_driver pata_at32_driver = {
 389         .remove        = __exit_p(pata_at32_remove),
 390         .driver        = {
 391                 .name  = "at32_ide",
 392                 .owner = THIS_MODULE,
 393         },
 394 };
 395
 396 module_platform_driver_probe(pata_at32_driver, pata_at32_probe);
 397
 398 MODULE_LICENSE("GPL");
 399 MODULE_DESCRIPTION("AVR32 SMC/CFC PATA Driver");
 400 MODULE_AUTHOR("Kristoffer Nyborg Gregertsen <kngregertsen@norway.atmel.com>");
 401 MODULE_VERSION(DRV_VERSION);