/* * linux/drivers/block/ali14xx.c Version 0.03 Feb 09, 1996 * * Copyright (C) 1996 Linus Torvalds & author (see below) */ /* * ALI M14xx chipset EIDE controller * * Works for ALI M1439/1443/1445/1487/1489 chipsets. * * Adapted from code developed by derekn@vw.ece.cmu.edu. -ml * Derek's notes follow: * * I think the code should be pretty understandable, * but I'll be happy to (try to) answer questions. * * The critical part is in the setupDrive function. The initRegisters * function doesn't seem to be necessary, but the DOS driver does it, so * I threw it in. * * I've only tested this on my system, which only has one disk. I posted * it to comp.sys.linux.hardware, so maybe some other people will try it * out. * * Derek Noonburg (derekn@ece.cmu.edu) * 95-sep-26 * * Update 96-jul-13: * * I've since upgraded to two disks and a CD-ROM, with no trouble, and * I've also heard from several others who have used it successfully. * This driver appears to work with both the 1443/1445 and the 1487/1489 * chipsets. I've added support for PIO mode 4 for the 1487. This * seems to work just fine on the 1443 also, although I'm not sure it's * advertised as supporting mode 4. (I've been running a WDC AC21200 in * mode 4 for a while now with no trouble.) -Derek */ #undef REALLY_SLOW_IO /* most systems can safely undef this */ #include #include #include #include #include #include #include #include #include #include #include "ide_modes.h" /* port addresses for auto-detection */ #define ALI_NUM_PORTS 4 static int ports[ALI_NUM_PORTS] __initdata = {0x074, 0x0f4, 0x034, 0x0e4}; /* register initialization data */ typedef struct { byte reg, data; } RegInitializer; static RegInitializer initData[] __initdata = { {0x01, 0x0f}, {0x02, 0x00}, {0x03, 0x00}, {0x04, 0x00}, {0x05, 0x00}, {0x06, 0x00}, {0x07, 0x2b}, {0x0a, 0x0f}, {0x25, 0x00}, {0x26, 0x00}, {0x27, 0x00}, {0x28, 0x00}, {0x29, 0x00}, {0x2a, 0x00}, {0x2f, 0x00}, {0x2b, 0x00}, {0x2c, 0x00}, {0x2d, 0x00}, {0x2e, 0x00}, {0x30, 0x00}, {0x31, 0x00}, {0x32, 0x00}, {0x33, 0x00}, {0x34, 0xff}, {0x35, 0x03}, {0x00, 0x00} }; #define ALI_MAX_PIO 4 /* timing parameter registers for each drive */ static struct { byte reg1, reg2, reg3, reg4; } regTab[4] = { {0x03, 0x26, 0x04, 0x27}, /* drive 0 */ {0x05, 0x28, 0x06, 0x29}, /* drive 1 */ {0x2b, 0x30, 0x2c, 0x31}, /* drive 2 */ {0x2d, 0x32, 0x2e, 0x33}, /* drive 3 */ }; static int basePort = 0; /* base port address */ static int regPort = 0; /* port for register number */ static int dataPort = 0; /* port for register data */ static byte regOn; /* output to base port to access registers */ static byte regOff; /* output to base port to close registers */ /*------------------------------------------------------------------------*/ /* * Read a controller register. */ static inline byte inReg (byte reg) { outb_p(reg, regPort); return inb(dataPort); } /* * Write a controller register. */ static void outReg (byte data, byte reg) { outb_p(reg, regPort); outb_p(data, dataPort); } /* * Set PIO mode for the specified drive. * This function computes timing parameters * and sets controller registers accordingly. */ static void ali14xx_tune_drive (ide_drive_t *drive, byte pio) { int driveNum; int time1, time2; byte param1, param2, param3, param4; unsigned long flags; ide_pio_data_t d; int bus_speed = ide_system_bus_speed(); pio = ide_get_best_pio_mode(drive, pio, ALI_MAX_PIO, &d); /* calculate timing, according to PIO mode */ time1 = d.cycle_time; time2 = ide_pio_timings[pio].active_time; param3 = param1 = (time2 * bus_speed + 999) / 1000; param4 = param2 = (time1 * bus_speed + 999) / 1000 - param1; if (pio < 3) { param3 += 8; param4 += 8; } printk("%s: PIO mode%d, t1=%dns, t2=%dns, cycles = %d+%d, %d+%d\n", drive->name, pio, time1, time2, param1, param2, param3, param4); /* stuff timing parameters into controller registers */ driveNum = (HWIF(drive)->index << 1) + drive->select.b.unit; save_flags(flags); /* all CPUs */ cli(); /* all CPUs */ outb_p(regOn, basePort); outReg(param1, regTab[driveNum].reg1); outReg(param2, regTab[driveNum].reg2); outReg(param3, regTab[driveNum].reg3); outReg(param4, regTab[driveNum].reg4); outb_p(regOff, basePort); restore_flags(flags); /* all CPUs */ } /* * Auto-detect the IDE controller port. */ static int __init findPort (void) { int i; byte t; unsigned long flags; __save_flags(flags); /* local CPU only */ __cli(); /* local CPU only */ for (i = 0; i < ALI_NUM_PORTS; ++i) { basePort = ports[i]; regOff = inb(basePort); for (regOn = 0x30; regOn <= 0x33; ++regOn) { outb_p(regOn, basePort); if (inb(basePort) == regOn) { regPort = basePort + 4; dataPort = basePort + 8; t = inReg(0) & 0xf0; outb_p(regOff, basePort); __restore_flags(flags); /* local CPU only */ if (t != 0x50) return 0; return 1; /* success */ } } outb_p(regOff, basePort); } __restore_flags(flags); /* local CPU only */ return 0; } /* * Initialize controller registers with default values. */ static int __init initRegisters (void) { RegInitializer *p; byte t; unsigned long flags; __save_flags(flags); /* local CPU only */ __cli(); /* local CPU only */ outb_p(regOn, basePort); for (p = initData; p->reg != 0; ++p) outReg(p->data, p->reg); outb_p(0x01, regPort); t = inb(regPort) & 0x01; outb_p(regOff, basePort); __restore_flags(flags); /* local CPU only */ return t; } void __init init_ali14xx (void) { /* auto-detect IDE controller port */ if (!findPort()) { printk("\nali14xx: not found"); return; } printk("\nali14xx: base= 0x%03x, regOn = 0x%02x", basePort, regOn); ide_hwifs[0].chipset = ide_ali14xx; ide_hwifs[1].chipset = ide_ali14xx; ide_hwifs[0].tuneproc = &ali14xx_tune_drive; ide_hwifs[1].tuneproc = &ali14xx_tune_drive; ide_hwifs[0].mate = &ide_hwifs[1]; ide_hwifs[1].mate = &ide_hwifs[0]; ide_hwifs[1].channel = 1; /* initialize controller registers */ if (!initRegisters()) { printk("\nali14xx: Chip initialization failed"); return; } }