drivers/ata/pata_qdi.c

   1 /*
   2  *    pata_qdi.c - QDI VLB ATA controllers
   3  *      (C) 2006 Red Hat <alan@redhat.com>
   4  *
   5  * This driver mostly exists as a proof of concept for non PCI devices under
   6  * libata. While the QDI6580 was 'neat' in 1993 it is no longer terribly
   7  * useful.
   8  *
   9  * Tuning code written from the documentation at
  10  * http://www.ryston.cz/petr/vlb/qd6500.html
  11  * http://www.ryston.cz/petr/vlb/qd6580.html
  12  *
  13  * Probe code based on drivers/ide/legacy/qd65xx.c
  14  * Rewritten from the work of Colten Edwards <pje120@cs.usask.ca> by
  15  * Samuel Thibault <samuel.thibault@fnac.net>
  16  */
  17
  18 #include <linux/kernel.h>
  19 #include <linux/module.h>
  20 #include <linux/pci.h>
  21 #include <linux/init.h>
  22 #include <linux/blkdev.h>
  23 #include <linux/delay.h>
  24 #include <scsi/scsi_host.h>
  25 #include <linux/libata.h>
  26 #include <linux/platform_device.h>
  27
  28 #define DRV_NAME "pata_qdi"
  29 #define DRV_VERSION "0.3.0"
  30
  31 #define NR_HOST 4       /* Two 6580s */
  32
  33 struct qdi_data {
  34         unsigned long timing;
  35         u8 clock[2];
  36         u8 last;
  37         int fast;
  38         struct platform_device *platform_dev;
  39
  40 };
  41
  42 static struct ata_host *qdi_host[NR_HOST];
  43 static struct qdi_data qdi_data[NR_HOST];
  44 static int nr_qdi_host;
  45
  46 #ifdef MODULE
  47 static int probe_qdi = 1;
  48 #else
  49 static int probe_qdi;
  50 #endif
  51
  52 static void qdi6500_set_piomode(struct ata_port *ap, struct ata_device *adev)
  53 {
  54         struct ata_timing t;
  55         struct qdi_data *qdi = ap->host->private_data;
  56         int active, recovery;
  57         u8 timing;
  58
  59         /* Get the timing data in cycles */
  60         ata_timing_compute(adev, adev->pio_mode, &t, 30303, 1000);
  61
  62         if (qdi->fast) {
  63                 active = 8 - FIT(t.active, 1, 8);
  64                 recovery = 18 - FIT(t.recover, 3, 18);
  65         } else {
  66                 active = 9 - FIT(t.active, 2, 9);
  67                 recovery = 15 - FIT(t.recover, 0, 15);
  68         }
  69         timing = (recovery << 4) | active | 0x08;
  70
  71         qdi->clock[adev->devno] = timing;
  72
  73         outb(timing, qdi->timing);
  74 }
  75
  76 static void qdi6580_set_piomode(struct ata_port *ap, struct ata_device *adev)
  77 {
  78         struct ata_timing t;
  79         struct qdi_data *qdi = ap->host->private_data;
  80         int active, recovery;
  81         u8 timing;
  82
  83         /* Get the timing data in cycles */
  84         ata_timing_compute(adev, adev->pio_mode, &t, 30303, 1000);
  85
  86         if (qdi->fast) {
  87                 active = 8 - FIT(t.active, 1, 8);
  88                 recovery = 18 - FIT(t.recover, 3, 18);
  89         } else {
  90                 active = 9 - FIT(t.active, 2, 9);
  91                 recovery = 15 - FIT(t.recover, 0, 15);
  92         }
  93         timing = (recovery << 4) | active | 0x08;
  94
  95         qdi->clock[adev->devno] = timing;
  96
  97         outb(timing, qdi->timing);
  98
  99         /* Clear the FIFO */
 100         if (adev->class != ATA_DEV_ATA)
 101                 outb(0x5F, (qdi->timing & 0xFFF0) + 3);
 102 }
 103
 104 /**
 105  *      qdi_qc_issue_prot       -       command issue
 106  *      @qc: command pending
 107  *
 108  *      Called when the libata layer is about to issue a command. We wrap
 109  *      this interface so that we can load the correct ATA timings.
 110  */
 111
 112 static unsigned int qdi_qc_issue_prot(struct ata_queued_cmd *qc)
 113 {
 114         struct ata_port *ap = qc->ap;
 115         struct ata_device *adev = qc->dev;
 116         struct qdi_data *qdi = ap->host->private_data;
 117
 118         if (qdi->clock[adev->devno] != qdi->last) {
 119                 if (adev->pio_mode) {
 120                         qdi->last = qdi->clock[adev->devno];
 121                         outb(qdi->clock[adev->devno], qdi->timing);
 122                 }
 123         }
 124         return ata_qc_issue_prot(qc);
 125 }
 126
 127 static void qdi_data_xfer(struct ata_device *adev, unsigned char *buf, unsigned int buflen, int write_data)
 128 {
 129         struct ata_port *ap = adev->ap;
 130         int slop = buflen & 3;
 131
 132         if (ata_id_has_dword_io(adev->id)) {
 133                 if (write_data)
 134                         iowrite32_rep(ap->ioaddr.data_addr, buf, buflen >> 2);
 135                 else
 136                         ioread32_rep(ap->ioaddr.data_addr, buf, buflen >> 2);
 137
 138                 if (unlikely(slop)) {
 139                         u32 pad;
 140                         if (write_data) {
 141                                 memcpy(&pad, buf + buflen - slop, slop);
 142                                 pad = le32_to_cpu(pad);
 143                                 iowrite32(pad, ap->ioaddr.data_addr);
 144                         } else {
 145                                 pad = ioread32(ap->ioaddr.data_addr);
 146                                 pad = cpu_to_le32(pad);
 147                                 memcpy(buf + buflen - slop, &pad, slop);
 148                         }
 149                 }
 150         } else
 151                 ata_data_xfer(adev, buf, buflen, write_data);
 152 }
 153
 154 static struct scsi_host_template qdi_sht = {
 155         .module                 = THIS_MODULE,
 156         .name                   = DRV_NAME,
 157         .ioctl                  = ata_scsi_ioctl,
 158         .queuecommand           = ata_scsi_queuecmd,
 159         .can_queue              = ATA_DEF_QUEUE,
 160         .this_id                = ATA_SHT_THIS_ID,
 161         .sg_tablesize           = LIBATA_MAX_PRD,
 162         .cmd_per_lun            = ATA_SHT_CMD_PER_LUN,
 163         .emulated               = ATA_SHT_EMULATED,
 164         .use_clustering         = ATA_SHT_USE_CLUSTERING,
 165         .proc_name              = DRV_NAME,
 166         .dma_boundary           = ATA_DMA_BOUNDARY,
 167         .slave_configure        = ata_scsi_slave_config,
 168         .slave_destroy          = ata_scsi_slave_destroy,
 169         .bios_param             = ata_std_bios_param,
 170 };
 171
 172 static struct ata_port_operations qdi6500_port_ops = {
 173         .port_disable   = ata_port_disable,
 174         .set_piomode    = qdi6500_set_piomode,
 175
 176         .tf_load        = ata_tf_load,
 177         .tf_read        = ata_tf_read,
 178         .check_status   = ata_check_status,
 179         .exec_command   = ata_exec_command,
 180         .dev_select     = ata_std_dev_select,
 181
 182         .freeze         = ata_bmdma_freeze,
 183         .thaw           = ata_bmdma_thaw,
 184         .error_handler  = ata_bmdma_error_handler,
 185         .post_internal_cmd = ata_bmdma_post_internal_cmd,
 186
 187         .qc_prep        = ata_qc_prep,
 188         .qc_issue       = qdi_qc_issue_prot,
 189
 190         .data_xfer      = qdi_data_xfer,
 191
 192         .irq_handler    = ata_interrupt,
 193         .irq_clear      = ata_bmdma_irq_clear,
 194         .irq_on         = ata_irq_on,
 195         .irq_ack        = ata_irq_ack,
 196
 197         .port_start     = ata_port_start,
 198 };
 199
 200 static struct ata_port_operations qdi6580_port_ops = {
 201         .port_disable   = ata_port_disable,
 202         .set_piomode    = qdi6580_set_piomode,
 203
 204         .tf_load        = ata_tf_load,
 205         .tf_read        = ata_tf_read,
 206         .check_status   = ata_check_status,
 207         .exec_command   = ata_exec_command,
 208         .dev_select     = ata_std_dev_select,
 209
 210         .freeze         = ata_bmdma_freeze,
 211         .thaw           = ata_bmdma_thaw,
 212         .error_handler  = ata_bmdma_error_handler,
 213         .post_internal_cmd = ata_bmdma_post_internal_cmd,
 214
 215         .qc_prep        = ata_qc_prep,
 216         .qc_issue       = qdi_qc_issue_prot,
 217
 218         .data_xfer      = qdi_data_xfer,
 219
 220         .irq_handler    = ata_interrupt,
 221         .irq_clear      = ata_bmdma_irq_clear,
 222         .irq_on         = ata_irq_on,
 223         .irq_ack        = ata_irq_ack,
 224
 225         .port_start     = ata_port_start,
 226 };
 227
 228 /**
 229  *      qdi_init_one            -       attach a qdi interface
 230  *      @type: Type to display
 231  *      @io: I/O port start
 232  *      @irq: interrupt line
 233  *      @fast: True if on a > 33Mhz VLB
 234  *
 235  *      Register an ISA bus IDE interface. Such interfaces are PIO and we
 236  *      assume do not support IRQ sharing.
 237  */
 238
 239 static __init int qdi_init_one(unsigned long port, int type, unsigned long io, int irq, int fast)
 240 {
 241         struct ata_probe_ent ae;
 242         struct platform_device *pdev;
 243         void __iomem *io_addr, *ctl_addr;
 244         int ret;
 245
 246         /*
 247          *      Fill in a probe structure first of all
 248          */
 249
 250         pdev = platform_device_register_simple(DRV_NAME, nr_qdi_host, NULL, 0);
 251         if (IS_ERR(pdev))
 252                 return PTR_ERR(pdev);
 253
 254         ret = -ENOMEM;
 255         io_addr = devm_ioport_map(&pdev->dev, io, 8);
 256         ctl_addr = devm_ioport_map(&pdev->dev, io + 0x206, 1);
 257         if (!io_addr || !ctl_addr)
 258                 goto fail;
 259
 260         memset(&ae, 0, sizeof(struct ata_probe_ent));
 261         INIT_LIST_HEAD(&ae.node);
 262         ae.dev = &pdev->dev;
 263
 264         if (type == 6580) {
 265                 ae.port_ops = &qdi6580_port_ops;
 266                 ae.pio_mask = 0x1F;
 267                 ae.port_flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST;
 268         } else {
 269                 ae.port_ops = &qdi6500_port_ops;
 270                 ae.pio_mask = 0x07;     /* Actually PIO3 !IORDY is possible */
 271                 ae.port_flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_SRST |
 272                                 ATA_FLAG_NO_IORDY;
 273         }
 274
 275         ae.sht = &qdi_sht;
 276         ae.n_ports = 1;
 277         ae.irq = irq;
 278         ae.irq_flags = 0;
 279         ae.port[0].cmd_addr = io_addr;
 280         ae.port[0].altstatus_addr = ctl_addr;
 281         ae.port[0].ctl_addr = ctl_addr;
 282         ata_std_ports(&ae.port[0]);
 283
 284         /*
 285          *      Hook in a private data structure per channel
 286          */
 287         ae.private_data = &qdi_data[nr_qdi_host];
 288
 289         qdi_data[nr_qdi_host].timing = port;
 290         qdi_data[nr_qdi_host].fast = fast;
 291         qdi_data[nr_qdi_host].platform_dev = pdev;
 292
 293         printk(KERN_INFO DRV_NAME": qd%d at 0x%lx.\n", type, io);
 294
 295         ret = -ENODEV;
 296         if (!ata_device_add(&ae))
 297                 goto fail;
 298
 299         qdi_host[nr_qdi_host++] = dev_get_drvdata(&pdev->dev);
 300         return 0;
 301
 302  fail:
 303         platform_device_unregister(pdev);
 304         return ret;
 305 }
 306
 307 /**
 308  *      qdi_init                -       attach qdi interfaces
 309  *
 310  *      Attach qdi IDE interfaces by scanning the ports it may occupy.
 311  */
 312
 313 static __init int qdi_init(void)
 314 {
 315         unsigned long flags;
 316         static const unsigned long qd_port[2] = { 0x30, 0xB0 };
 317         static const unsigned long ide_port[2] = { 0x170, 0x1F0 };
 318         static const int ide_irq[2] = { 14, 15 };
 319
 320         int ct = 0;
 321         int i;
 322
 323         if (probe_qdi == 0)
 324                 return -ENODEV;
 325
 326         /*
 327          *      Check each possible QD65xx base address
 328          */
 329
 330         for (i = 0; i < 2; i++) {
 331                 unsigned long port = qd_port[i];
 332                 u8 r, res;
 333
 334
 335                 if (request_region(port, 2, "pata_qdi")) {
 336                         /* Check for a card */
 337                         local_irq_save(flags);
 338                         r = inb_p(port);
 339                         outb_p(0x19, port);
 340                         res = inb_p(port);
 341                         outb_p(r, port);
 342                         local_irq_restore(flags);
 343
 344                         /* Fail */
 345                         if (res == 0x19)
 346                         {
 347                                 release_region(port, 2);
 348                                 continue;
 349                         }
 350
 351                         /* Passes the presence test */
 352                         r = inb_p(port + 1);    /* Check port agrees with port set */
 353                         if ((r & 2) >> 1 != i) {
 354                                 release_region(port, 2);
 355                                 continue;
 356                         }
 357
 358                         /* Check card type */
 359                         if ((r & 0xF0) == 0xC0) {
 360                                 /* QD6500: single channel */
 361                                 if (r & 8) {
 362                                         /* Disabled ? */
 363                                         release_region(port, 2);
 364                                         continue;
 365                                 }
 366                                 if (qdi_init_one(port, 6500, ide_port[r & 0x01], ide_irq[r & 0x01], r & 0x04) == 0)
 367                                         ct++;
 368                         }
 369                         if (((r & 0xF0) == 0xA0) || (r & 0xF0) == 0x50) {
 370                                 /* QD6580: dual channel */
 371                                 if (!request_region(port + 2 , 2, "pata_qdi"))
 372                                 {
 373                                         release_region(port, 2);
 374                                         continue;
 375                                 }
 376                                 res = inb(port + 3);
 377                                 if (res & 1) {
 378                                         /* Single channel mode */
 379                                         if (qdi_init_one(port, 6580, ide_port[r & 0x01], ide_irq[r & 0x01], r & 0x04))
 380                                                 ct++;
 381                                 } else {
 382                                         /* Dual channel mode */
 383                                         if (qdi_init_one(port, 6580, 0x1F0, 14, r & 0x04) == 0)
 384                                                 ct++;
 385                                         if (qdi_init_one(port + 2, 6580, 0x170, 15, r & 0x04) == 0)
 386                                                 ct++;
 387                                 }
 388                         }
 389                 }
 390         }
 391         if (ct != 0)
 392                 return 0;
 393         return -ENODEV;
 394 }
 395
 396 static __exit void qdi_exit(void)
 397 {
 398         int i;
 399
 400         for (i = 0; i < nr_qdi_host; i++) {
 401                 ata_host_detach(qdi_host[i]);
 402                 /* Free the control resource. The 6580 dual channel has the resources
 403                  * claimed as a pair of 2 byte resources so we need no special cases...
 404                  */
 405                 release_region(qdi_data[i].timing, 2);
 406                 platform_device_unregister(qdi_data[i].platform_dev);
 407         }
 408 }
 409
 410 MODULE_AUTHOR("Alan Cox");
 411 MODULE_DESCRIPTION("low-level driver for qdi ATA");
 412 MODULE_LICENSE("GPL");
 413 MODULE_VERSION(DRV_VERSION);
 414
 415 module_init(qdi_init);
 416 module_exit(qdi_exit);
 417
 418 module_param(probe_qdi, int, 0);
 419