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351 lines
9.8 KiB
351 lines
9.8 KiB
/*
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* Copyright (C) 1995-2000 Linus Torvalds & author (see below)
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*/
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/*
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* HT-6560B EIDE-controller support
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* To activate controller support use kernel parameter "ide0=ht6560b".
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* Use hdparm utility to enable PIO mode support.
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*
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* Author: Mikko Ala-Fossi <maf@iki.fi>
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* Jan Evert van Grootheest <j.e.van.grootheest@caiway.nl>
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*
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* Try: http://www.maf.iki.fi/~maf/ht6560b/
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*/
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#define DRV_NAME "ht6560b"
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#define HT6560B_VERSION "v0.08"
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/delay.h>
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#include <linux/timer.h>
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#include <linux/mm.h>
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#include <linux/ioport.h>
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#include <linux/blkdev.h>
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#include <linux/ide.h>
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#include <linux/init.h>
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#include <asm/io.h>
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/* #define DEBUG */ /* remove comments for DEBUG messages */
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/*
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* The special i/o-port that HT-6560B uses to configuration:
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* bit0 (0x01): "1" selects secondary interface
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* bit2 (0x04): "1" enables FIFO function
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* bit5 (0x20): "1" enables prefetched data read function (???)
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*
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* The special i/o-port that HT-6560A uses to configuration:
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* bit0 (0x01): "1" selects secondary interface
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* bit1 (0x02): "1" enables prefetched data read function
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* bit2 (0x04): "0" enables multi-master system (?)
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* bit3 (0x08): "1" 3 cycle time, "0" 2 cycle time (?)
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*/
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#define HT_CONFIG_PORT 0x3e6
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#define HT_CONFIG(drivea) (u8)(((drivea)->drive_data & 0xff00) >> 8)
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/*
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* FIFO + PREFETCH (both a/b-model)
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*/
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#define HT_CONFIG_DEFAULT 0x1c /* no prefetch */
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/* #define HT_CONFIG_DEFAULT 0x3c */ /* with prefetch */
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#define HT_SECONDARY_IF 0x01
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#define HT_PREFETCH_MODE 0x20
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/*
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* ht6560b Timing values:
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*
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* I reviewed some assembler source listings of htide drivers and found
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* out how they setup those cycle time interfacing values, as they at Holtek
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* call them. IDESETUP.COM that is supplied with the drivers figures out
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* optimal values and fetches those values to drivers. I found out that
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* they use Select register to fetch timings to the ide board right after
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* interface switching. After that it was quite easy to add code to
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* ht6560b.c.
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*
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* IDESETUP.COM gave me values 0x24, 0x45, 0xaa, 0xff that worked fine
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* for hda and hdc. But hdb needed higher values to work, so I guess
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* that sometimes it is necessary to give higher value than IDESETUP
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* gives. [see cmd640.c for an extreme example of this. -ml]
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*
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* Perhaps I should explain something about these timing values:
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* The higher nibble of value is the Recovery Time (rt) and the lower nibble
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* of the value is the Active Time (at). Minimum value 2 is the fastest and
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* the maximum value 15 is the slowest. Default values should be 15 for both.
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* So 0x24 means 2 for rt and 4 for at. Each of the drives should have
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* both values, and IDESETUP gives automatically rt=15 st=15 for CDROMs or
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* similar. If value is too small there will be all sorts of failures.
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*
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* Timing byte consists of
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* High nibble: Recovery Cycle Time (rt)
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* The valid values range from 2 to 15. The default is 15.
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*
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* Low nibble: Active Cycle Time (at)
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* The valid values range from 2 to 15. The default is 15.
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*
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* You can obtain optimized timing values by running Holtek IDESETUP.COM
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* for DOS. DOS drivers get their timing values from command line, where
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* the first value is the Recovery Time and the second value is the
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* Active Time for each drive. Smaller value gives higher speed.
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* In case of failures you should probably fall back to a higher value.
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*/
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#define HT_TIMING(drivea) (u8)((drivea)->drive_data & 0x00ff)
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#define HT_TIMING_DEFAULT 0xff
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/*
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* This routine handles interface switching for the peculiar hardware design
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* on the F.G.I./Holtek HT-6560B VLB IDE interface.
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* The HT-6560B can only enable one IDE port at a time, and requires a
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* silly sequence (below) whenever we switch between primary and secondary.
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*/
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/*
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* This routine is invoked from ide.c to prepare for access to a given drive.
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*/
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static void ht6560b_selectproc (ide_drive_t *drive)
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{
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ide_hwif_t *hwif = drive->hwif;
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unsigned long flags;
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static u8 current_select = 0;
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static u8 current_timing = 0;
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u8 select, timing;
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local_irq_save(flags);
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select = HT_CONFIG(drive);
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timing = HT_TIMING(drive);
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/*
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* Need to enforce prefetch sometimes because otherwise
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* it'll hang (hard).
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*/
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if (drive->media != ide_disk ||
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(drive->dev_flags & IDE_DFLAG_PRESENT) == 0)
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select |= HT_PREFETCH_MODE;
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if (select != current_select || timing != current_timing) {
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current_select = select;
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current_timing = timing;
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(void)inb(HT_CONFIG_PORT);
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(void)inb(HT_CONFIG_PORT);
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(void)inb(HT_CONFIG_PORT);
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(void)inb(HT_CONFIG_PORT);
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outb(select, HT_CONFIG_PORT);
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/*
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* Set timing for this drive:
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*/
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outb(timing, hwif->io_ports.device_addr);
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(void)inb(hwif->io_ports.status_addr);
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#ifdef DEBUG
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printk("ht6560b: %s: select=%#x timing=%#x\n",
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drive->name, select, timing);
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#endif
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}
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local_irq_restore(flags);
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}
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/*
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* Autodetection and initialization of ht6560b
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*/
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static int __init try_to_init_ht6560b(void)
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{
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u8 orig_value;
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int i;
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/* Autodetect ht6560b */
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if ((orig_value = inb(HT_CONFIG_PORT)) == 0xff)
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return 0;
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for (i=3;i>0;i--) {
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outb(0x00, HT_CONFIG_PORT);
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if (!( (~inb(HT_CONFIG_PORT)) & 0x3f )) {
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outb(orig_value, HT_CONFIG_PORT);
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return 0;
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}
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}
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outb(0x00, HT_CONFIG_PORT);
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if ((~inb(HT_CONFIG_PORT))& 0x3f) {
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outb(orig_value, HT_CONFIG_PORT);
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return 0;
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}
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/*
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* Ht6560b autodetected
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*/
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outb(HT_CONFIG_DEFAULT, HT_CONFIG_PORT);
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outb(HT_TIMING_DEFAULT, 0x1f6); /* Select register */
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(void)inb(0x1f7); /* Status register */
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printk("ht6560b " HT6560B_VERSION
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": chipset detected and initialized"
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#ifdef DEBUG
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" with debug enabled"
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#endif
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"\n"
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);
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return 1;
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}
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static u8 ht_pio2timings(ide_drive_t *drive, const u8 pio)
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{
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int active_time, recovery_time;
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int active_cycles, recovery_cycles;
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int bus_speed = ide_vlb_clk ? ide_vlb_clk : 50;
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if (pio) {
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unsigned int cycle_time;
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struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio);
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cycle_time = ide_pio_cycle_time(drive, pio);
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/*
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* Just like opti621.c we try to calculate the
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* actual cycle time for recovery and activity
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* according system bus speed.
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*/
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active_time = t->active;
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recovery_time = cycle_time - active_time - t->setup;
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/*
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* Cycle times should be Vesa bus cycles
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*/
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active_cycles = (active_time * bus_speed + 999) / 1000;
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recovery_cycles = (recovery_time * bus_speed + 999) / 1000;
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/*
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* Upper and lower limits
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*/
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if (active_cycles < 2) active_cycles = 2;
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if (recovery_cycles < 2) recovery_cycles = 2;
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if (active_cycles > 15) active_cycles = 15;
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if (recovery_cycles > 15) recovery_cycles = 0; /* 0==16 */
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#ifdef DEBUG
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printk("ht6560b: drive %s setting pio=%d recovery=%d (%dns) active=%d (%dns)\n", drive->name, pio, recovery_cycles, recovery_time, active_cycles, active_time);
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#endif
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return (u8)((recovery_cycles << 4) | active_cycles);
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} else {
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#ifdef DEBUG
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printk("ht6560b: drive %s setting pio=0\n", drive->name);
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#endif
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return HT_TIMING_DEFAULT; /* default setting */
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}
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}
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static DEFINE_SPINLOCK(ht6560b_lock);
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/*
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* Enable/Disable so called prefetch mode
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*/
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static void ht_set_prefetch(ide_drive_t *drive, u8 state)
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{
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unsigned long flags;
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int t = HT_PREFETCH_MODE << 8;
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spin_lock_irqsave(&ht6560b_lock, flags);
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/*
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* Prefetch mode and unmask irq seems to conflict
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*/
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if (state) {
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drive->drive_data |= t; /* enable prefetch mode */
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drive->dev_flags |= IDE_DFLAG_NO_UNMASK;
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drive->dev_flags &= ~IDE_DFLAG_UNMASK;
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} else {
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drive->drive_data &= ~t; /* disable prefetch mode */
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drive->dev_flags &= ~IDE_DFLAG_NO_UNMASK;
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}
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spin_unlock_irqrestore(&ht6560b_lock, flags);
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#ifdef DEBUG
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printk("ht6560b: drive %s prefetch mode %sabled\n", drive->name, (state ? "en" : "dis"));
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#endif
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}
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static void ht6560b_set_pio_mode(ide_drive_t *drive, const u8 pio)
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{
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unsigned long flags;
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u8 timing;
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switch (pio) {
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case 8: /* set prefetch off */
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case 9: /* set prefetch on */
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ht_set_prefetch(drive, pio & 1);
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return;
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}
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timing = ht_pio2timings(drive, pio);
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spin_lock_irqsave(&ht6560b_lock, flags);
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drive->drive_data &= 0xff00;
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drive->drive_data |= timing;
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spin_unlock_irqrestore(&ht6560b_lock, flags);
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#ifdef DEBUG
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printk("ht6560b: drive %s tuned to pio mode %#x timing=%#x\n", drive->name, pio, timing);
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#endif
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}
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static void __init ht6560b_init_dev(ide_drive_t *drive)
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{
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ide_hwif_t *hwif = drive->hwif;
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/* Setting default configurations for drives. */
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int t = (HT_CONFIG_DEFAULT << 8) | HT_TIMING_DEFAULT;
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if (hwif->channel)
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t |= (HT_SECONDARY_IF << 8);
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drive->drive_data = t;
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}
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static int probe_ht6560b;
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module_param_named(probe, probe_ht6560b, bool, 0);
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MODULE_PARM_DESC(probe, "probe for HT6560B chipset");
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static const struct ide_port_ops ht6560b_port_ops = {
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.init_dev = ht6560b_init_dev,
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.set_pio_mode = ht6560b_set_pio_mode,
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.selectproc = ht6560b_selectproc,
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};
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static const struct ide_port_info ht6560b_port_info __initdata = {
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.name = DRV_NAME,
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.chipset = ide_ht6560b,
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.port_ops = &ht6560b_port_ops,
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.host_flags = IDE_HFLAG_SERIALIZE | /* is this needed? */
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IDE_HFLAG_NO_DMA |
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IDE_HFLAG_ABUSE_PREFETCH,
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.pio_mask = ATA_PIO4,
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};
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static int __init ht6560b_init(void)
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{
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if (probe_ht6560b == 0)
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return -ENODEV;
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if (!request_region(HT_CONFIG_PORT, 1, DRV_NAME)) {
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printk(KERN_NOTICE "%s: HT_CONFIG_PORT not found\n",
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__func__);
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return -ENODEV;
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}
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if (!try_to_init_ht6560b()) {
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printk(KERN_NOTICE "%s: HBA not found\n", __func__);
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goto release_region;
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}
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return ide_legacy_device_add(&ht6560b_port_info, 0);
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release_region:
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release_region(HT_CONFIG_PORT, 1);
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return -ENODEV;
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}
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module_init(ht6560b_init);
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MODULE_AUTHOR("See Local File");
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MODULE_DESCRIPTION("HT-6560B EIDE-controller support");
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MODULE_LICENSE("GPL");
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