linux/drivers/ide/ali14xx.c
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   1/*
   2 *  Copyright (C) 1996  Linus Torvalds & author (see below)
   3 */
   4
   5/*
   6 * ALI M14xx chipset EIDE controller
   7 *
   8 * Works for ALI M1439/1443/1445/1487/1489 chipsets.
   9 *
  10 * Adapted from code developed by derekn@vw.ece.cmu.edu.  -ml
  11 * Derek's notes follow:
  12 *
  13 * I think the code should be pretty understandable,
  14 * but I'll be happy to (try to) answer questions.
  15 *
  16 * The critical part is in the setupDrive function.  The initRegisters
  17 * function doesn't seem to be necessary, but the DOS driver does it, so
  18 * I threw it in.
  19 *
  20 * I've only tested this on my system, which only has one disk.  I posted
  21 * it to comp.sys.linux.hardware, so maybe some other people will try it
  22 * out.
  23 *
  24 * Derek Noonburg  (derekn@ece.cmu.edu)
  25 * 95-sep-26
  26 *
  27 * Update 96-jul-13:
  28 *
  29 * I've since upgraded to two disks and a CD-ROM, with no trouble, and
  30 * I've also heard from several others who have used it successfully.
  31 * This driver appears to work with both the 1443/1445 and the 1487/1489
  32 * chipsets.  I've added support for PIO mode 4 for the 1487.  This
  33 * seems to work just fine on the 1443 also, although I'm not sure it's
  34 * advertised as supporting mode 4.  (I've been running a WDC AC21200 in
  35 * mode 4 for a while now with no trouble.)  -Derek
  36 */
  37
  38#include <linux/module.h>
  39#include <linux/types.h>
  40#include <linux/kernel.h>
  41#include <linux/delay.h>
  42#include <linux/timer.h>
  43#include <linux/mm.h>
  44#include <linux/ioport.h>
  45#include <linux/blkdev.h>
  46#include <linux/ide.h>
  47#include <linux/init.h>
  48
  49#include <asm/io.h>
  50
  51#define DRV_NAME "ali14xx"
  52
  53/* port addresses for auto-detection */
  54#define ALI_NUM_PORTS 4
  55static const int ports[ALI_NUM_PORTS] __initconst =
  56        { 0x074, 0x0f4, 0x034, 0x0e4 };
  57
  58/* register initialization data */
  59typedef struct { u8 reg, data; } RegInitializer;
  60
  61static const RegInitializer initData[] __initconst = {
  62        {0x01, 0x0f}, {0x02, 0x00}, {0x03, 0x00}, {0x04, 0x00},
  63        {0x05, 0x00}, {0x06, 0x00}, {0x07, 0x2b}, {0x0a, 0x0f},
  64        {0x25, 0x00}, {0x26, 0x00}, {0x27, 0x00}, {0x28, 0x00},
  65        {0x29, 0x00}, {0x2a, 0x00}, {0x2f, 0x00}, {0x2b, 0x00},
  66        {0x2c, 0x00}, {0x2d, 0x00}, {0x2e, 0x00}, {0x30, 0x00},
  67        {0x31, 0x00}, {0x32, 0x00}, {0x33, 0x00}, {0x34, 0xff},
  68        {0x35, 0x03}, {0x00, 0x00}
  69};
  70
  71/* timing parameter registers for each drive */
  72static struct { u8 reg1, reg2, reg3, reg4; } regTab[4] = {
  73        {0x03, 0x26, 0x04, 0x27},     /* drive 0 */
  74        {0x05, 0x28, 0x06, 0x29},     /* drive 1 */
  75        {0x2b, 0x30, 0x2c, 0x31},     /* drive 2 */
  76        {0x2d, 0x32, 0x2e, 0x33},     /* drive 3 */
  77};
  78
  79static int basePort;    /* base port address */
  80static int regPort;     /* port for register number */
  81static int dataPort;    /* port for register data */
  82static u8 regOn;        /* output to base port to access registers */
  83static u8 regOff;       /* output to base port to close registers */
  84
  85/*------------------------------------------------------------------------*/
  86
  87/*
  88 * Read a controller register.
  89 */
  90static inline u8 inReg(u8 reg)
  91{
  92        outb_p(reg, regPort);
  93        return inb(dataPort);
  94}
  95
  96/*
  97 * Write a controller register.
  98 */
  99static void outReg(u8 data, u8 reg)
 100{
 101        outb_p(reg, regPort);
 102        outb_p(data, dataPort);
 103}
 104
 105static DEFINE_SPINLOCK(ali14xx_lock);
 106
 107/*
 108 * Set PIO mode for the specified drive.
 109 * This function computes timing parameters
 110 * and sets controller registers accordingly.
 111 */
 112static void ali14xx_set_pio_mode(ide_hwif_t *hwif, ide_drive_t *drive)
 113{
 114        int driveNum;
 115        int time1, time2;
 116        u8 param1, param2, param3, param4;
 117        unsigned long flags;
 118        int bus_speed = ide_vlb_clk ? ide_vlb_clk : 50;
 119        const u8 pio = drive->pio_mode - XFER_PIO_0;
 120        struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
 121
 122        /* calculate timing, according to PIO mode */
 123        time1 = ide_pio_cycle_time(drive, pio);
 124        time2 = t->active;
 125        param3 = param1 = (time2 * bus_speed + 999) / 1000;
 126        param4 = param2 = (time1 * bus_speed + 999) / 1000 - param1;
 127        if (pio < 3) {
 128                param3 += 8;
 129                param4 += 8;
 130        }
 131        printk(KERN_DEBUG "%s: PIO mode%d, t1=%dns, t2=%dns, cycles = %d+%d, %d+%d\n",
 132                drive->name, pio, time1, time2, param1, param2, param3, param4);
 133
 134        /* stuff timing parameters into controller registers */
 135        driveNum = (drive->hwif->index << 1) + (drive->dn & 1);
 136        spin_lock_irqsave(&ali14xx_lock, flags);
 137        outb_p(regOn, basePort);
 138        outReg(param1, regTab[driveNum].reg1);
 139        outReg(param2, regTab[driveNum].reg2);
 140        outReg(param3, regTab[driveNum].reg3);
 141        outReg(param4, regTab[driveNum].reg4);
 142        outb_p(regOff, basePort);
 143        spin_unlock_irqrestore(&ali14xx_lock, flags);
 144}
 145
 146/*
 147 * Auto-detect the IDE controller port.
 148 */
 149static int __init findPort(void)
 150{
 151        int i;
 152        u8 t;
 153        unsigned long flags;
 154
 155        local_irq_save(flags);
 156        for (i = 0; i < ALI_NUM_PORTS; ++i) {
 157                basePort = ports[i];
 158                regOff = inb(basePort);
 159                for (regOn = 0x30; regOn <= 0x33; ++regOn) {
 160                        outb_p(regOn, basePort);
 161                        if (inb(basePort) == regOn) {
 162                                regPort = basePort + 4;
 163                                dataPort = basePort + 8;
 164                                t = inReg(0) & 0xf0;
 165                                outb_p(regOff, basePort);
 166                                local_irq_restore(flags);
 167                                if (t != 0x50)
 168                                        return 0;
 169                                return 1;  /* success */
 170                        }
 171                }
 172                outb_p(regOff, basePort);
 173        }
 174        local_irq_restore(flags);
 175        return 0;
 176}
 177
 178/*
 179 * Initialize controller registers with default values.
 180 */
 181static int __init initRegisters(void)
 182{
 183        const RegInitializer *p;
 184        u8 t;
 185        unsigned long flags;
 186
 187        local_irq_save(flags);
 188        outb_p(regOn, basePort);
 189        for (p = initData; p->reg != 0; ++p)
 190                outReg(p->data, p->reg);
 191        outb_p(0x01, regPort);
 192        t = inb(regPort) & 0x01;
 193        outb_p(regOff, basePort);
 194        local_irq_restore(flags);
 195        return t;
 196}
 197
 198static const struct ide_port_ops ali14xx_port_ops = {
 199        .set_pio_mode           = ali14xx_set_pio_mode,
 200};
 201
 202static const struct ide_port_info ali14xx_port_info = {
 203        .name                   = DRV_NAME,
 204        .chipset                = ide_ali14xx,
 205        .port_ops               = &ali14xx_port_ops,
 206        .host_flags             = IDE_HFLAG_NO_DMA,
 207        .pio_mask               = ATA_PIO4,
 208};
 209
 210static int __init ali14xx_probe(void)
 211{
 212        printk(KERN_DEBUG "ali14xx: base=0x%03x, regOn=0x%02x.\n",
 213                          basePort, regOn);
 214
 215        /* initialize controller registers */
 216        if (!initRegisters()) {
 217                printk(KERN_ERR "ali14xx: Chip initialization failed.\n");
 218                return 1;
 219        }
 220
 221        return ide_legacy_device_add(&ali14xx_port_info, 0);
 222}
 223
 224static bool probe_ali14xx;
 225
 226module_param_named(probe, probe_ali14xx, bool, 0);
 227MODULE_PARM_DESC(probe, "probe for ALI M14xx chipsets");
 228
 229static int __init ali14xx_init(void)
 230{
 231        if (probe_ali14xx == 0)
 232                goto out;
 233
 234        /* auto-detect IDE controller port */
 235        if (findPort()) {
 236                if (ali14xx_probe())
 237                        return -ENODEV;
 238                return 0;
 239        }
 240        printk(KERN_ERR "ali14xx: not found.\n");
 241out:
 242        return -ENODEV;
 243}
 244
 245module_init(ali14xx_init);
 246
 247MODULE_AUTHOR("see local file");
 248MODULE_DESCRIPTION("support of ALI 14XX IDE chipsets");
 249MODULE_LICENSE("GPL");
 250
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