LXR linux/drivers/ata/pata

   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
  33struct 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
  42static struct ata_host *qdi_host[NR_HOST];
  43static struct qdi_data qdi_data[NR_HOST];
  44static int nr_qdi_host;
  45
  46#ifdef MODULE
  47static int probe_qdi = 1;
  48#else
  49static int probe_qdi;
  50#endif
  51
  52static 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
  76static 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
 112static 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
 127static 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
 156static struct scsi_host_template qdi_sht = {
 157        ATA_PIO_SHT(DRV_NAME),
 158};
 159
 160static 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
 168static 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
 184static __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 = ATA_PIO4;
 216                ap->flags |= ATA_FLAG_SLAVE_POSS;
 217        } else {
 218                ap->ops = &qdi6500_port_ops;
 219                ap->pio_mask = ATA_PIO2; /* 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
 260static __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
 343static __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
 357MODULE_AUTHOR("Alan Cox");
 358MODULE_DESCRIPTION("low-level driver for qdi ATA");
 359MODULE_LICENSE("GPL");
 360MODULE_VERSION(DRV_VERSION);
 361
 362module_init(qdi_init);
 363module_exit(qdi_exit);
 364
 365module_param(probe_qdi, int, 0);
 366
 367