diff options
Diffstat (limited to 'drivers/ide/ht6560b.c')
| -rw-r--r-- | drivers/ide/ht6560b.c | 351 |
1 files changed, 351 insertions, 0 deletions
diff --git a/drivers/ide/ht6560b.c b/drivers/ide/ht6560b.c new file mode 100644 index 0000000..c7e5c22 --- /dev/null +++ b/drivers/ide/ht6560b.c @@ -0,0 +1,351 @@ +/* + * Copyright (C) 1995-2000 Linus Torvalds & author (see below) + */ + +/* + * HT-6560B EIDE-controller support + * To activate controller support use kernel parameter "ide0=ht6560b". + * Use hdparm utility to enable PIO mode support. + * + * Author: Mikko Ala-Fossi <maf@iki.fi> + * Jan Evert van Grootheest <j.e.van.grootheest@caiway.nl> + * + * Try: http://www.maf.iki.fi/~maf/ht6560b/ + */ + +#define DRV_NAME "ht6560b" +#define HT6560B_VERSION "v0.08" + +#include <linux/module.h> +#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/ide.h> +#include <linux/init.h> + +#include <asm/io.h> + +/* #define DEBUG */ /* remove comments for DEBUG messages */ + +/* + * The special i/o-port that HT-6560B uses to configuration: + * bit0 (0x01): "1" selects secondary interface + * bit2 (0x04): "1" enables FIFO function + * bit5 (0x20): "1" enables prefetched data read function (???) + * + * The special i/o-port that HT-6560A uses to configuration: + * bit0 (0x01): "1" selects secondary interface + * bit1 (0x02): "1" enables prefetched data read function + * bit2 (0x04): "0" enables multi-master system (?) + * bit3 (0x08): "1" 3 cycle time, "0" 2 cycle time (?) + */ +#define HT_CONFIG_PORT 0x3e6 +#define HT_CONFIG(drivea) (u8)(((drivea)->drive_data & 0xff00) >> 8) +/* + * FIFO + PREFETCH (both a/b-model) + */ +#define HT_CONFIG_DEFAULT 0x1c /* no prefetch */ +/* #define HT_CONFIG_DEFAULT 0x3c */ /* with prefetch */ +#define HT_SECONDARY_IF 0x01 +#define HT_PREFETCH_MODE 0x20 + +/* + * ht6560b Timing values: + * + * 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 Select register 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. + * + * Timing byte consists of + * High nibble: Recovery Cycle Time (rt) + * The valid values range from 2 to 15. The default is 15. + * + * Low nibble: Active Cycle 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. + */ +#define HT_TIMING(drivea) (u8)((drivea)->drive_data & 0x00ff) +#define HT_TIMING_DEFAULT 0xff + +/* + * 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 routine is invoked from ide.c to prepare for access to a given drive. + */ +static void ht6560b_selectproc (ide_drive_t *drive) +{ + ide_hwif_t *hwif = drive->hwif; + unsigned long flags; + static u8 current_select = 0; + static u8 current_timing = 0; + u8 select, timing; + + local_irq_save(flags); + + select = HT_CONFIG(drive); + timing = HT_TIMING(drive); + + /* + * Need to enforce prefetch sometimes because otherwise + * it'll hang (hard). + */ + if (drive->media != ide_disk || + (drive->dev_flags & IDE_DFLAG_PRESENT) == 0) + select |= HT_PREFETCH_MODE; + + if (select != current_select || timing != current_timing) { + current_select = select; + current_timing = timing; + (void)inb(HT_CONFIG_PORT); + (void)inb(HT_CONFIG_PORT); + (void)inb(HT_CONFIG_PORT); + (void)inb(HT_CONFIG_PORT); + outb(select, HT_CONFIG_PORT); + /* + * Set timing for this drive: + */ + outb(timing, hwif->io_ports.device_addr); + (void)inb(hwif->io_ports.status_addr); +#ifdef DEBUG + printk("ht6560b: %s: select=%#x timing=%#x\n", + drive->name, select, timing); +#endif + } + local_irq_restore(flags); +} + +/* + * Autodetection and initialization of ht6560b + */ +static int __init try_to_init_ht6560b(void) +{ + u8 orig_value; + int i; + + /* Autodetect ht6560b */ + if ((orig_value = inb(HT_CONFIG_PORT)) == 0xff) + return 0; + + for (i=3;i>0;i--) { + outb(0x00, HT_CONFIG_PORT); + if (!( (~inb(HT_CONFIG_PORT)) & 0x3f )) { + outb(orig_value, HT_CONFIG_PORT); + return 0; + } + } + outb(0x00, HT_CONFIG_PORT); + if ((~inb(HT_CONFIG_PORT))& 0x3f) { + outb(orig_value, HT_CONFIG_PORT); + return 0; + } + /* + * Ht6560b autodetected + */ + outb(HT_CONFIG_DEFAULT, HT_CONFIG_PORT); + outb(HT_TIMING_DEFAULT, 0x1f6); /* Select register */ + (void)inb(0x1f7); /* Status register */ + + printk("ht6560b " HT6560B_VERSION + ": chipset detected and initialized" +#ifdef DEBUG + " with debug enabled" +#endif + "\n" + ); + return 1; +} + +static u8 ht_pio2timings(ide_drive_t *drive, const u8 pio) +{ + int active_time, recovery_time; + int active_cycles, recovery_cycles; + int bus_speed = ide_vlb_clk ? ide_vlb_clk : 50; + + if (pio) { + unsigned int cycle_time; + struct ide_timing *t = ide_timing_find_mode(XFER_PIO_0 + pio); + + cycle_time = ide_pio_cycle_time(drive, pio); + + /* + * Just like opti621.c we try to calculate the + * actual cycle time for recovery and activity + * according system bus speed. + */ + active_time = t->active; + recovery_time = cycle_time - active_time - t->setup; + /* + * Cycle times should be Vesa bus cycles + */ + active_cycles = (active_time * bus_speed + 999) / 1000; + recovery_cycles = (recovery_time * bus_speed + 999) / 1000; + /* + * Upper and lower limits + */ + if (active_cycles < 2) active_cycles = 2; + if (recovery_cycles < 2) recovery_cycles = 2; + if (active_cycles > 15) active_cycles = 15; + if (recovery_cycles > 15) recovery_cycles = 0; /* 0==16 */ + +#ifdef DEBUG + 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); +#endif + + return (u8)((recovery_cycles << 4) | active_cycles); + } else { + +#ifdef DEBUG + printk("ht6560b: drive %s setting pio=0\n", drive->name); +#endif + + return HT_TIMING_DEFAULT; /* default setting */ + } +} + +static DEFINE_SPINLOCK(ht6560b_lock); + +/* + * Enable/Disable so called prefetch mode + */ +static void ht_set_prefetch(ide_drive_t *drive, u8 state) +{ + unsigned long flags; + int t = HT_PREFETCH_MODE << 8; + + spin_lock_irqsave(&ht6560b_lock, flags); + + /* + * Prefetch mode and unmask irq seems to conflict + */ + if (state) { + drive->drive_data |= t; /* enable prefetch mode */ + drive->dev_flags |= IDE_DFLAG_NO_UNMASK; + drive->dev_flags &= ~IDE_DFLAG_UNMASK; + } else { + drive->drive_data &= ~t; /* disable prefetch mode */ + drive->dev_flags &= ~IDE_DFLAG_NO_UNMASK; + } + + spin_unlock_irqrestore(&ht6560b_lock, flags); + +#ifdef DEBUG + printk("ht6560b: drive %s prefetch mode %sabled\n", drive->name, (state ? "en" : "dis")); +#endif +} + +static void ht6560b_set_pio_mode(ide_drive_t *drive, const u8 pio) +{ + unsigned long flags; + u8 timing; + + switch (pio) { + case 8: /* set prefetch off */ + case 9: /* set prefetch on */ + ht_set_prefetch(drive, pio & 1); + return; + } + + timing = ht_pio2timings(drive, pio); + + spin_lock_irqsave(&ht6560b_lock, flags); + drive->drive_data &= 0xff00; + drive->drive_data |= timing; + spin_unlock_irqrestore(&ht6560b_lock, flags); + +#ifdef DEBUG + printk("ht6560b: drive %s tuned to pio mode %#x timing=%#x\n", drive->name, pio, timing); +#endif +} + +static void __init ht6560b_init_dev(ide_drive_t *drive) +{ + ide_hwif_t *hwif = drive->hwif; + /* Setting default configurations for drives. */ + int t = (HT_CONFIG_DEFAULT << 8) | HT_TIMING_DEFAULT; + + if (hwif->channel) + t |= (HT_SECONDARY_IF << 8); + + drive->drive_data = t; +} + +static int probe_ht6560b; + +module_param_named(probe, probe_ht6560b, bool, 0); +MODULE_PARM_DESC(probe, "probe for HT6560B chipset"); + +static const struct ide_port_ops ht6560b_port_ops = { + .init_dev = ht6560b_init_dev, + .set_pio_mode = ht6560b_set_pio_mode, + .selectproc = ht6560b_selectproc, +}; + +static const struct ide_port_info ht6560b_port_info __initdata = { + .name = DRV_NAME, + .chipset = ide_ht6560b, + .port_ops = &ht6560b_port_ops, + .host_flags = IDE_HFLAG_SERIALIZE | /* is this needed? */ + IDE_HFLAG_NO_DMA | + IDE_HFLAG_ABUSE_PREFETCH, + .pio_mask = ATA_PIO4, +}; + +static int __init ht6560b_init(void) +{ + if (probe_ht6560b == 0) + return -ENODEV; + + if (!request_region(HT_CONFIG_PORT, 1, DRV_NAME)) { + printk(KERN_NOTICE "%s: HT_CONFIG_PORT not found\n", + __func__); + return -ENODEV; + } + + if (!try_to_init_ht6560b()) { + printk(KERN_NOTICE "%s: HBA not found\n", __func__); + goto release_region; + } + + return ide_legacy_device_add(&ht6560b_port_info, 0); + +release_region: + release_region(HT_CONFIG_PORT, 1); + return -ENODEV; +} + +module_init(ht6560b_init); + +MODULE_AUTHOR("See Local File"); +MODULE_DESCRIPTION("HT-6560B EIDE-controller support"); +MODULE_LICENSE("GPL"); |
