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_drive_t *drive, const u8 pio)
 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         struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
 120
 121         /* calculate timing, according to PIO mode */
 122         time1 = ide_pio_cycle_time(drive, pio);
 123         time2 = t->active;
 124         param3 = param1 = (time2 * bus_speed + 999) / 1000;
 125         param4 = param2 = (time1 * bus_speed + 999) / 1000 - param1;
 126         if (pio < 3) {
 127                 param3 += 8;
 128                 param4 += 8;
 129         }
 130         printk(KERN_DEBUG "%s: PIO mode%d, t1=%dns, t2=%dns, cycles = %d+%d, %d+%d\n",
 131                 drive->name, pio, time1, time2, param1, param2, param3, param4);
 132
 133         /* stuff timing parameters into controller registers */
 134         driveNum = (drive->hwif->index << 1) + (drive->dn & 1);
 135         spin_lock_irqsave(&ali14xx_lock, flags);
 136         outb_p(regOn, basePort);
 137         outReg(param1, regTab[driveNum].reg1);
 138         outReg(param2, regTab[driveNum].reg2);
 139         outReg(param3, regTab[driveNum].reg3);
 140         outReg(param4, regTab[driveNum].reg4);
 141         outb_p(regOff, basePort);
 142         spin_unlock_irqrestore(&ali14xx_lock, flags);
 143 }
 144
 145 /*
 146  * Auto-detect the IDE controller port.
 147  */
 148 static int __init findPort(void)
 149 {
 150         int i;
 151         u8 t;
 152         unsigned long flags;
 153
 154         local_irq_save(flags);
 155         for (i = 0; i < ALI_NUM_PORTS; ++i) {
 156                 basePort = ports[i];
 157                 regOff = inb(basePort);
 158                 for (regOn = 0x30; regOn <= 0x33; ++regOn) {
 159                         outb_p(regOn, basePort);
 160                         if (inb(basePort) == regOn) {
 161                                 regPort = basePort + 4;
 162                                 dataPort = basePort + 8;
 163                                 t = inReg(0) & 0xf0;
 164                                 outb_p(regOff, basePort);
 165                                 local_irq_restore(flags);
 166                                 if (t != 0x50)
 167                                         return 0;
 168                                 return 1;  /* success */
 169                         }
 170                 }
 171                 outb_p(regOff, basePort);
 172         }
 173         local_irq_restore(flags);
 174         return 0;
 175 }
 176
 177 /*
 178  * Initialize controller registers with default values.
 179  */
 180 static int __init initRegisters(void)
 181 {
 182         const RegInitializer *p;
 183         u8 t;
 184         unsigned long flags;
 185
 186         local_irq_save(flags);
 187         outb_p(regOn, basePort);
 188         for (p = initData; p->reg != 0; ++p)
 189                 outReg(p->data, p->reg);
 190         outb_p(0x01, regPort);
 191         t = inb(regPort) & 0x01;
 192         outb_p(regOff, basePort);
 193         local_irq_restore(flags);
 194         return t;
 195 }
 196
 197 static const struct ide_port_ops ali14xx_port_ops = {
 198         .set_pio_mode           = ali14xx_set_pio_mode,
 199 };
 200
 201 static const struct ide_port_info ali14xx_port_info = {
 202         .name                   = DRV_NAME,
 203         .chipset                = ide_ali14xx,
 204         .port_ops               = &ali14xx_port_ops,
 205         .host_flags             = IDE_HFLAG_NO_DMA,
 206         .pio_mask               = ATA_PIO4,
 207 };
 208
 209 static int __init ali14xx_probe(void)
 210 {
 211         printk(KERN_DEBUG "ali14xx: base=0x%03x, regOn=0x%02x.\n",
 212                           basePort, regOn);
 213
 214         /* initialize controller registers */
 215         if (!initRegisters()) {
 216                 printk(KERN_ERR "ali14xx: Chip initialization failed.\n");
 217                 return 1;
 218         }
 219
 220         return ide_legacy_device_add(&ali14xx_port_info, 0);
 221 }
 222
 223 static int probe_ali14xx;
 224
 225 module_param_named(probe, probe_ali14xx, bool, 0);
 226 MODULE_PARM_DESC(probe, "probe for ALI M14xx chipsets");
 227
 228 static int __init ali14xx_init(void)
 229 {
 230         if (probe_ali14xx == 0)
 231                 goto out;
 232
 233         /* auto-detect IDE controller port */
 234         if (findPort()) {
 235                 if (ali14xx_probe())
 236                         return -ENODEV;
 237                 return 0;
 238         }
 239         printk(KERN_ERR "ali14xx: not found.\n");
 240 out:
 241         return -ENODEV;
 242 }
 243
 244 module_init(ali14xx_init);
 245
 246 MODULE_AUTHOR("see local file");
 247 MODULE_DESCRIPTION("support of ALI 14XX IDE chipsets");
 248 MODULE_LICENSE("GPL");