diff options
Diffstat (limited to 'drivers/ide/pci/cmd64x.c')
| -rw-r--r-- | drivers/ide/pci/cmd64x.c | 45 |
1 files changed, 20 insertions, 25 deletions
diff --git a/drivers/ide/pci/cmd64x.c b/drivers/ide/pci/cmd64x.c index b0d4825c56a..561197f7b5b 100644 --- a/drivers/ide/pci/cmd64x.c +++ b/drivers/ide/pci/cmd64x.c @@ -1,6 +1,6 @@ /* $Id: cmd64x.c,v 1.21 2000/01/30 23:23:16 * - * linux/drivers/ide/pci/cmd64x.c Version 1.41 Feb 3, 2007 + * linux/drivers/ide/pci/cmd64x.c Version 1.42 Feb 8, 2007 * * cmd64x.c: Enable interrupts at initialization time on Ultra/PCI machines. * Note, this driver is not used at all on other systems because @@ -189,6 +189,11 @@ static int cmd64x_get_info (char *buffer, char **addr, off_t offset, int count) #endif /* defined(DISPLAY_CMD64X_TIMINGS) && defined(CONFIG_PROC_FS) */ +static u8 quantize_timing(int timing, int quant) +{ + return (timing + quant - 1) / quant; +} + /* * This routine writes the prepared setup/active/recovery counts * for a drive into the cmd646 chipset registers to active them. @@ -268,47 +273,37 @@ static void program_drive_counts (ide_drive_t *drive, int setup_count, int activ */ static u8 cmd64x_tune_pio (ide_drive_t *drive, u8 mode_wanted) { - int setup_time, active_time, recovery_time; - int clock_time, pio_mode, cycle_time; - u8 recovery_count2, cycle_count; - int setup_count, active_count, recovery_count; - int bus_speed = system_bus_clock(); - ide_pio_data_t d; + int setup_time, active_time, cycle_time; + u8 cycle_count, setup_count, active_count, recovery_count; + u8 pio_mode; + int clock_time = 1000 / system_bus_clock(); + ide_pio_data_t pio; - pio_mode = ide_get_best_pio_mode(drive, mode_wanted, 5, &d); - cycle_time = d.cycle_time; + pio_mode = ide_get_best_pio_mode(drive, mode_wanted, 5, &pio); + cycle_time = pio.cycle_time; - /* - * I copied all this complicated stuff from cmd640.c and made a few - * minor changes. For now I am just going to pray that it is correct. - */ setup_time = ide_pio_timings[pio_mode].setup_time; active_time = ide_pio_timings[pio_mode].active_time; - recovery_time = cycle_time - (setup_time + active_time); - clock_time = 1000 / bus_speed; - cycle_count = (cycle_time + clock_time - 1) / clock_time; - - setup_count = (setup_time + clock_time - 1) / clock_time; - active_count = (active_time + clock_time - 1) / clock_time; + setup_count = quantize_timing( setup_time, clock_time); + cycle_count = quantize_timing( cycle_time, clock_time); + active_count = quantize_timing(active_time, clock_time); - recovery_count = (recovery_time + clock_time - 1) / clock_time; - recovery_count2 = cycle_count - (setup_count + active_count); - if (recovery_count2 > recovery_count) - recovery_count = recovery_count2; + recovery_count = cycle_count - active_count; + /* program_drive_counts() takes care of zero recovery cycles */ if (recovery_count > 16) { active_count += recovery_count - 16; recovery_count = 16; } if (active_count > 16) - active_count = 16; /* maximum allowed by cmd646 */ + active_count = 16; /* maximum allowed by cmd64x */ program_drive_counts (drive, setup_count, active_count, recovery_count); cmdprintk("%s: PIO mode wanted %d, selected %d (%dns)%s, " "clocks=%d/%d/%d\n", drive->name, mode_wanted, pio_mode, cycle_time, - d.overridden ? " (overriding vendor mode)" : "", + pio.overridden ? " (overriding vendor mode)" : "", setup_count, active_count, recovery_count); return pio_mode; |