/* * linux/drivers/block/ht6580.c Version 0.04 Mar 19, 1996 * * Copyright (C) 1995-1996 Linus Torvalds & author (see below) */ /* * * Version 0.01 Initial version hacked out of ide.c * * Version 0.02 Added support for PIO modes, auto-tune * * Version 0.03 Some cleanups * * I reviewed some assembler source listings of htide drivers and found * out how they setup those cycle time interfacing values, as they at Holtek * call them. IDESETUP.COM that is supplied with the drivers figures out * optimal values and fetches those values to drivers. I found out that * they use IDE_SELECT_REG to fetch timings to the ide board right after * interface switching. After that it was quite easy to add code to * ht6560b.c. * * IDESETUP.COM gave me values 0x24, 0x45, 0xaa, 0xff that worked fine * for hda and hdc. But hdb needed higher values to work, so I guess * that sometimes it is necessary to give higher value than IDESETUP * gives. [see cmd640.c for an extreme example of this. -ml] * * Perhaps I should explain something about these timing values: * The higher nibble of value is the Recovery Time (rt) and the lower nibble * of the value is the Active Time (at). Minimum value 2 is the fastest and * the maximum value 15 is the slowest. Default values should be 15 for both. * So 0x24 means 2 for rt and 4 for at. Each of the drives should have * both values, and IDESETUP gives automatically rt=15 st=15 for cdroms or * similar. If value is too small there will be all sorts of failures. * * Port 0x3e6 bit 0x20 sets these timings on/off. If 0x20 bit is set * these timings are disabled. * * Mikko Ala-Fossi * * More notes: * * There's something still missing from the initialization code, though. * If I have booted to dos sometime after power on, I can get smaller * timing values working. Perhaps I could soft-ice the initialization. * * -=- malafoss@snakemail.hut.fi -=- searching the marvels of universe -=- */ #undef REALLY_SLOW_IO /* most systems can safely undef this */ #include #include #include #include #include #include #include #include #include #include "ide.h" #include "ide_modes.h" /* * This routine handles interface switching for the peculiar hardware design * on the F.G.I./Holtek HT-6560B VLB IDE interface. * The HT-6560B can only enable one IDE port at a time, and requires a * silly sequence (below) whenever we switch between primary and secondary. * * This stuff is courtesy of malafoss@snakemail.hut.fi * (or maf@nemesis.tky.hut.fi) * * At least one user has reported that this code can confuse the floppy * controller and/or driver -- perhaps this should be changed to use * a read-modify-write sequence, so as not to disturb other bits in the reg? */ /* * The special i/o-port that HT-6560B uses to select interfaces: */ #define HT_SELECT_PORT 0x3e6 /* * We don't know what all of the bits are for, but we *do* know about these: * bit5 (0x20): "1" selects slower speed by disabling use of timing values * bit0 (0x01): "1" selects second interface */ static byte ht6560b_selects [2][MAX_DRIVES] = {{0x3c,0x3c}, {0x3d,0x3d}}; /* * VLB ht6560b Timing values: * * Timing byte consists of * High nibble: Recovery Time (rt) * The valid values range from 2 to 15. The default is 15. * * Low nibble: Active Time (at) * The valid values range from 2 to 15. The default is 15. * * You can obtain optimized timing values by running Holtek IDESETUP.COM * for DOS. DOS drivers get their timing values from command line, where * the first value is the Recovery Time and the second value is the * Active Time for each drive. Smaller value gives higher speed. * In case of failures you should probably fall back to a higher value. * * Hopefully this example will make it clearer: * * DOS: DEVICE=C:\bin\HTIDE\HTIDE.SYS /D0=2,4 /D1=4,5 /D2=10,10 /D3=15,15 * Linux: byte ht6560b_timings [][] = {{0x24, 0x45}, {0xaa, 0xff}}; * * Note: There are no ioctls to change these values directly, * but settings can be approximated as PIO modes, using "hdparm": * * rc.local: hdparm -p3 /dev/hda -p2 /dev/hdb -p1 /dev/hdc -p0 /dev/hdd */ static byte ht6560b_timings [2][MAX_DRIVES] = {{0xff,0xff}, {0xff,0xff}}; static byte pio_to_timings[6] = {0xff, 0xaa, 0x45, 0x24, 0x13, 0x12}; /* * This routine is invoked from ide.c to prepare for access to a given drive. */ static void ht6560b_selectproc (ide_drive_t *drive) { byte t; unsigned long flags; static byte current_select = 0; static byte current_timing = 0; byte select = ht6560b_selects[HWIF(drive)->index][drive->select.b.unit]; byte timing = ht6560b_timings[HWIF(drive)->index][drive->select.b.unit]; if (select != current_select || timing != current_timing) { current_select = select; current_timing = timing; save_flags (flags); cli(); (void) inb(HT_SELECT_PORT); (void) inb(HT_SELECT_PORT); (void) inb(HT_SELECT_PORT); /* * Note: input bits are reversed to output bits!! */ t = inb(HT_SELECT_PORT) ^ 0x3f; t &= (~0x21); t |= (current_select & 0x21); outb(t, HT_SELECT_PORT); /* * Set timing for this drive: */ outb (timing, IDE_SELECT_REG); (void) inb (IDE_STATUS_REG); restore_flags (flags); #ifdef DEBUG printk("ht6560b: %s: select=%#x timing=%#x\n", drive->name, t, timing); #endif } OUT_BYTE(drive->select.all,IDE_SELECT_REG); } /* * Autodetection and initialization of ht6560b */ int try_to_init_ht6560b(void) { byte orig_value; int i; /* Autodetect ht6560b */ if ((orig_value=inb(HT_SELECT_PORT)) == 0xff) return 0; for (i=3;i>0;i--) { outb(0x00, HT_SELECT_PORT); if (!( (~inb(HT_SELECT_PORT)) & 0x3f )) { outb(orig_value, HT_SELECT_PORT); return 0; } } outb(0x00, HT_SELECT_PORT); if ((~inb(HT_SELECT_PORT))& 0x3f) { outb(orig_value, HT_SELECT_PORT); return 0; } /* * Ht6560b autodetected: * reverse input bits to output bits * initialize bit1 to 0 */ outb((orig_value ^ 0x3f) & 0xfd, HT_SELECT_PORT); printk("\nht6560b: detected and initialized"); return 1; } static void tune_ht6560b (ide_drive_t *drive, byte pio) { unsigned int hwif, unit; if (pio == 255) { /* auto-tune */ if (drive->media != ide_disk) pio = 0; /* some cdroms don't like fast modes (?) */ else pio = ide_get_best_pio_mode(drive, pio, 5, NULL); } unit = drive->select.b.unit; hwif = HWIF(drive)->index; ht6560b_timings[hwif][unit] = pio_to_timings[pio]; if (pio == 0) ht6560b_selects[hwif][unit] |= 0x20; else ht6560b_selects[hwif][unit] &= ~0x20; } void init_ht6560b (void) { if (check_region(HT_SELECT_PORT,1)) { printk("\nht6560b: PORT 0x3e6 ALREADY IN USE\n"); } else { if (try_to_init_ht6560b()) { request_region(HT_SELECT_PORT, 1, ide_hwifs[0].name); ide_hwifs[0].chipset = ide_ht6560b; ide_hwifs[1].chipset = ide_ht6560b; ide_hwifs[0].selectproc = &ht6560b_selectproc; ide_hwifs[1].selectproc = &ht6560b_selectproc; ide_hwifs[0].tuneproc = &tune_ht6560b; ide_hwifs[1].tuneproc = &tune_ht6560b; ide_hwifs[0].serialized = 1; ide_hwifs[1].serialized = 1; ide_hwifs[0].mate = &ide_hwifs[1]; ide_hwifs[1].mate = &ide_hwifs[0]; } else printk("\nht6560b: not found\n"); } }