drivers/ata/pata_qdi.c

   1 /*
   2  *    pata_qdi.c - QDI VLB ATA controllers
   3  *      (C) 2006 Red Hat
   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@ens-lyon.org>
  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 "0.3.1"
  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 - clamp_val(t.active, 1, 8);
  64                 recovery = 18 - clamp_val(t.recover, 3, 18);
  65         } else {
  66                 active = 9 - clamp_val(t.active, 2, 9);
  67                 recovery = 15 - clamp_val(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 - clamp_val(t.active, 1, 8);
  88                 recovery = 18 - clamp_val(t.recover, 3, 18);
  89         } else {
  90                 active = 9 - clamp_val(t.active, 2, 9);
  91                 recovery = 15 - clamp_val(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            -       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(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_sff_qc_issue(qc);
 125 }
 126
 127 static unsigned int qdi_data_xfer(struct ata_device *dev, unsigned char *buf,
 128                                   unsigned int buflen, int rw)
 129 {
 130         if (ata_id_has_dword_io(dev->id)) {
 131                 struct ata_port *ap = dev->link->ap;
 132                 int slop = buflen & 3;
 133
 134                 if (rw == READ)
 135                         ioread32_rep(ap->ioaddr.data_addr, buf, buflen >> 2);
 136                 else
 137                         iowrite32_rep(ap->ioaddr.data_addr, buf, buflen >> 2);
 138
 139                 if (unlikely(slop)) {
 140                         __le32 pad;
 141                         if (rw == READ) {
 142                                 pad = cpu_to_le32(ioread32(ap->ioaddr.data_addr));
 143                                 memcpy(buf + buflen - slop, &pad, slop);
 144                         } else {
 145                                 memcpy(&pad, buf + buflen - slop, slop);
 146                                 iowrite32(le32_to_cpu(pad), ap->ioaddr.data_addr);
 147                         }
 148                         buflen += 4 - slop;
 149                 }
 150         } else
 151                 buflen = ata_sff_data_xfer(dev, buf, buflen, rw);
 152
 153         return buflen;
 154 }
 155
 156 static struct scsi_host_template qdi_sht = {
 157         ATA_PIO_SHT(DRV_NAME),
 158 };
 159
 160 static struct ata_port_operations qdi6500_port_ops = {
 161         .inherits       = &ata_sff_port_ops,
 162         .qc_issue       = qdi_qc_issue,
 163         .sff_data_xfer  = qdi_data_xfer,
 164         .cable_detect   = ata_cable_40wire,
 165         .set_piomode    = qdi6500_set_piomode,
 166 };
 167
 168 static struct ata_port_operations qdi6580_port_ops = {
 169         .inherits       = &qdi6500_port_ops,
 170         .set_piomode    = qdi6580_set_piomode,
 171 };
 172
 173 /**
 174  *      qdi_init_one            -       attach a qdi interface
 175  *      @type: Type to display
 176  *      @io: I/O port start
 177  *      @irq: interrupt line
 178  *      @fast: True if on a > 33Mhz VLB
 179  *
 180  *      Register an ISA bus IDE interface. Such interfaces are PIO and we
 181  *      assume do not support IRQ sharing.
 182  */
 183
 184 static __init int qdi_init_one(unsigned long port, int type, unsigned long io, int irq, int fast)
 185 {
 186         unsigned long ctl = io + 0x206;
 187         struct platform_device *pdev;
 188         struct ata_host *host;
 189         struct ata_port *ap;
 190         void __iomem *io_addr, *ctl_addr;
 191         int ret;
 192
 193         /*
 194          *      Fill in a probe structure first of all
 195          */
 196
 197         pdev = platform_device_register_simple(DRV_NAME, nr_qdi_host, NULL, 0);
 198         if (IS_ERR(pdev))
 199                 return PTR_ERR(pdev);
 200
 201         ret = -ENOMEM;
 202         io_addr = devm_ioport_map(&pdev->dev, io, 8);
 203         ctl_addr = devm_ioport_map(&pdev->dev, ctl, 1);
 204         if (!io_addr || !ctl_addr)
 205                 goto fail;
 206
 207         ret = -ENOMEM;
 208         host = ata_host_alloc(&pdev->dev, 1);
 209         if (!host)
 210                 goto fail;
 211         ap = host->ports[0];
 212
 213         if (type == 6580) {
 214                 ap->ops = &qdi6580_port_ops;
 215                 ap->pio_mask = 0x1F;
 216                 ap->flags |= ATA_FLAG_SLAVE_POSS;
 217         } else {
 218                 ap->ops = &qdi6500_port_ops;
 219                 ap->pio_mask = 0x07;    /* Actually PIO3 !IORDY is possible */
 220                 ap->flags = ATA_FLAG_SLAVE_POSS | ATA_FLAG_NO_IORDY;
 221         }
 222
 223         ap->ioaddr.cmd_addr = io_addr;
 224         ap->ioaddr.altstatus_addr = ctl_addr;
 225         ap->ioaddr.ctl_addr = ctl_addr;
 226         ata_sff_std_ports(&ap->ioaddr);
 227
 228         ata_port_desc(ap, "cmd %lx ctl %lx", io, ctl);
 229
 230         /*
 231          *      Hook in a private data structure per channel
 232          */
 233         ap->private_data = &qdi_data[nr_qdi_host];
 234
 235         qdi_data[nr_qdi_host].timing = port;
 236         qdi_data[nr_qdi_host].fast = fast;
 237         qdi_data[nr_qdi_host].platform_dev = pdev;
 238
 239         printk(KERN_INFO DRV_NAME": qd%d at 0x%lx.\n", type, io);
 240
 241         /* activate */
 242         ret = ata_host_activate(host, irq, ata_sff_interrupt, 0, &qdi_sht);
 243         if (ret)
 244                 goto fail;
 245
 246         qdi_host[nr_qdi_host++] = dev_get_drvdata(&pdev->dev);
 247         return 0;
 248
 249  fail:
 250         platform_device_unregister(pdev);
 251         return ret;
 252 }
 253
 254 /**
 255  *      qdi_init                -       attach qdi interfaces
 256  *
 257  *      Attach qdi IDE interfaces by scanning the ports it may occupy.
 258  */
 259
 260 static __init int qdi_init(void)
 261 {
 262         unsigned long flags;
 263         static const unsigned long qd_port[2] = { 0x30, 0xB0 };
 264         static const unsigned long ide_port[2] = { 0x170, 0x1F0 };
 265         static const int ide_irq[2] = { 14, 15 };
 266
 267         int ct = 0;
 268         int i;
 269
 270         if (probe_qdi == 0)
 271                 return -ENODEV;
 272
 273         /*
 274          *      Check each possible QD65xx base address
 275          */
 276
 277         for (i = 0; i < 2; i++) {
 278                 unsigned long port = qd_port[i];
 279                 u8 r, res;
 280
 281
 282                 if (request_region(port, 2, "pata_qdi")) {
 283                         /* Check for a card */
 284                         local_irq_save(flags);
 285                         r = inb_p(port);
 286                         outb_p(0x19, port);
 287                         res = inb_p(port);
 288                         outb_p(r, port);
 289                         local_irq_restore(flags);
 290
 291                         /* Fail */
 292                         if (res == 0x19)
 293                         {
 294                                 release_region(port, 2);
 295                                 continue;
 296                         }
 297
 298                         /* Passes the presence test */
 299                         r = inb_p(port + 1);    /* Check port agrees with port set */
 300                         if ((r & 2) >> 1 != i) {
 301                                 release_region(port, 2);
 302                                 continue;
 303                         }
 304
 305                         /* Check card type */
 306                         if ((r & 0xF0) == 0xC0) {
 307                                 /* QD6500: single channel */
 308                                 if (r & 8) {
 309                                         /* Disabled ? */
 310                                         release_region(port, 2);
 311                                         continue;
 312                                 }
 313                                 if (qdi_init_one(port, 6500, ide_port[r & 0x01], ide_irq[r & 0x01], r & 0x04) == 0)
 314                                         ct++;
 315                         }
 316                         if (((r & 0xF0) == 0xA0) || (r & 0xF0) == 0x50) {
 317                                 /* QD6580: dual channel */
 318                                 if (!request_region(port + 2 , 2, "pata_qdi"))
 319                                 {
 320                                         release_region(port, 2);
 321                                         continue;
 322                                 }
 323                                 res = inb(port + 3);
 324                                 if (res & 1) {
 325                                         /* Single channel mode */
 326                                         if (qdi_init_one(port, 6580, ide_port[r & 0x01], ide_irq[r & 0x01], r & 0x04) == 0)
 327                                                 ct++;
 328                                 } else {
 329                                         /* Dual channel mode */
 330                                         if (qdi_init_one(port, 6580, 0x1F0, 14, r & 0x04) == 0)
 331                                                 ct++;
 332                                         if (qdi_init_one(port + 2, 6580, 0x170, 15, r & 0x04) == 0)
 333                                                 ct++;
 334                                 }
 335                         }
 336                 }
 337         }
 338         if (ct != 0)
 339                 return 0;
 340         return -ENODEV;
 341 }
 342
 343 static __exit void qdi_exit(void)
 344 {
 345         int i;
 346
 347         for (i = 0; i < nr_qdi_host; i++) {
 348                 ata_host_detach(qdi_host[i]);
 349                 /* Free the control resource. The 6580 dual channel has the resources
 350                  * claimed as a pair of 2 byte resources so we need no special cases...
 351                  */
 352                 release_region(qdi_data[i].timing, 2);
 353                 platform_device_unregister(qdi_data[i].platform_dev);
 354         }
 355 }
 356
 357 MODULE_AUTHOR("Alan Cox");
 358 MODULE_DESCRIPTION("low-level driver for qdi ATA");
 359 MODULE_LICENSE("GPL");
 360 MODULE_VERSION(DRV_VERSION);
 361
 362 module_init(qdi_init);
 363 module_exit(qdi_exit);
 364
 365 module_param(probe_qdi, int, 0);
 366