diff options
Diffstat (limited to 'drivers/ide/ali14xx.c')
| -rw-r--r-- | drivers/ide/ali14xx.c | 225 |
1 files changed, 225 insertions, 0 deletions
diff --git a/drivers/ide/ali14xx.c b/drivers/ide/ali14xx.c new file mode 100644 index 000000000..b3ffaa529 --- /dev/null +++ b/drivers/ide/ali14xx.c @@ -0,0 +1,225 @@ +/* + * 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 <linux/types.h> +#include <linux/kernel.h> +#include <linux/delay.h> +#include <linux/timer.h> +#include <linux/mm.h> +#include <linux/ioport.h> +#include <linux/blkdev.h> +#include <linux/hdreg.h> +#include <linux/ide.h> + +#include <asm/io.h> + +#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; + } +} |