release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/ide/ali14xx.c

   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
  55 static const int ports[ALI_NUM_PORTS] __initdata =
  56         { 0x074, 0x0f4, 0x034, 0x0e4 };
  57
  58 /* register initialization data */
  59 typedef struct { u8 reg, data; } RegInitializer;
  60
  61 static const RegInitializer initData[] __initdata = {
  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 */
  72 static 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
  79 static int basePort;    /* base port address */
  80 static int regPort;     /* port for register number */
  81 static int dataPort;    /* port for register data */
  82 static u8 regOn;        /* output to base port to access registers */
  83 static u8 regOff;       /* output to base port to close registers */
  84
  85 /*------------------------------------------------------------------------*/
  86
  87 /*
  88  * Read a controller register.
  89  */
  90 static inline u8 inReg(u8 reg)
  91 {
  92         outb_p(reg, regPort);
  93         return inb(dataPort);
  94 }
  95
  96 /*
  97  * Write a controller register.
  98  */
  99 static void outReg(u8 data, u8 reg)
 100 {
 101         outb_p(reg, regPort);
 102         outb_p(data, dataPort);
 103 }
 104
 105 static 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  */
 112 static 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  */
 149 static 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  */
 181 static 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
 198 static const struct ide_port_ops ali14xx_port_ops = {
 199         .set_pio_mode           = ali14xx_set_pio_mode,
 200 };
 201
 202 static 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
 210 static 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
 224 static int probe_ali14xx;
 225
 226 module_param_named(probe, probe_ali14xx, bool, 0);
 227 MODULE_PARM_DESC(probe, "probe for ALI M14xx chipsets");
 228
 229 static 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");
 241 out:
 242         return -ENODEV;
 243 }
 244
 245 module_init(ali14xx_init);
 246
 247 MODULE_AUTHOR("see local file");
 248 MODULE_DESCRIPTION("support of ALI 14XX IDE chipsets");
 249 MODULE_LICENSE("GPL");