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383 lines
10 KiB
383 lines
10 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]> |
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* Jan Evert van Grootheest <[email protected]> |
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* |
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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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static inline u8 HT_CONFIG(ide_drive_t *drive) |
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{ |
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return ((unsigned long)ide_get_drivedata(drive) & 0xff00) >> 8; |
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} |
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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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static inline u8 HT_TIMING(ide_drive_t *drive) |
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{ |
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return (unsigned long)ide_get_drivedata(drive) & 0x00ff; |
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} |
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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_dev_select(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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outb(drive->select | ATA_DEVICE_OBS, hwif->io_ports.device_addr); |
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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, config; |
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int t = HT_PREFETCH_MODE << 8; |
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spin_lock_irqsave(&ht6560b_lock, flags); |
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config = (unsigned long)ide_get_drivedata(drive); |
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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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config |= 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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config &= ~t; /* disable prefetch mode */ |
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drive->dev_flags &= ~IDE_DFLAG_NO_UNMASK; |
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} |
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ide_set_drivedata(drive, (void *)config); |
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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_hwif_t *hwif, ide_drive_t *drive) |
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{ |
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unsigned long flags, config; |
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const u8 pio = drive->pio_mode - XFER_PIO_0; |
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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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config = (unsigned long)ide_get_drivedata(drive); |
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config &= 0xff00; |
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config |= timing; |
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ide_set_drivedata(drive, (void *)config); |
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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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unsigned long 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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ide_set_drivedata(drive, (void *)t); |
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} |
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static bool 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_tp_ops ht6560b_tp_ops = { |
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.exec_command = ide_exec_command, |
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.read_status = ide_read_status, |
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.read_altstatus = ide_read_altstatus, |
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.write_devctl = ide_write_devctl, |
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.dev_select = ht6560b_dev_select, |
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.tf_load = ide_tf_load, |
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.tf_read = ide_tf_read, |
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.input_data = ide_input_data, |
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.output_data = ide_output_data, |
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}; |
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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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}; |
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static const struct ide_port_info ht6560b_port_info __initconst = { |
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.name = DRV_NAME, |
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.chipset = ide_ht6560b, |
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.tp_ops = &ht6560b_tp_ops, |
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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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