diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/ide/pci/opti621.c | 92 |
1 files changed, 15 insertions, 77 deletions
diff --git a/drivers/ide/pci/opti621.c b/drivers/ide/pci/opti621.c index c746e6f06077..8c715b7a85db 100644 --- a/drivers/ide/pci/opti621.c +++ b/drivers/ide/pci/opti621.c @@ -81,8 +81,6 @@ * 0.5 doesn't work. */ -#define OPTI621_DEBUG /* define for debug messages */ - #include <linux/types.h> #include <linux/module.h> #include <linux/kernel.h> @@ -110,23 +108,8 @@ static int reg_base; -#define PIO_NOT_EXIST 254 -#define PIO_DONT_KNOW 255 - static DEFINE_SPINLOCK(opti621_lock); -static int cmpt_clk(int time, int bus_speed) -/* Returns (rounded up) time in clocks for time in ns, - * with bus_speed in MHz. - * Example: bus_speed = 40 MHz, time = 80 ns - * 1000/40 = 25 ns (clk value), - * 80/25 = 3.2, rounded up to 4 (I hope ;-)). - * Use idebus=xx to select right frequency. - */ -{ - return ((time*bus_speed+999)/1000); -} - /* Write value to register reg, base of register * is at reg_base (0x1f0 primary, 0x170 secondary, * if not changed by PCI configuration). @@ -159,51 +142,22 @@ static u8 read_reg(int reg) return ret; } -typedef struct pio_clocks_s { - int address_time; /* Address setup (clocks) */ - int data_time; /* Active/data pulse (clocks) */ - int recovery_time; /* Recovery time (clocks) */ -} pio_clocks_t; - -static void compute_clocks(int pio, pio_clocks_t *clks, int bus_speed) -{ - if (pio != PIO_NOT_EXIST) { - int adr_setup, data_pls; - - adr_setup = ide_pio_timings[pio].setup_time; - data_pls = ide_pio_timings[pio].active_time; - clks->address_time = cmpt_clk(adr_setup, bus_speed); - clks->data_time = cmpt_clk(data_pls, bus_speed); - clks->recovery_time = cmpt_clk(ide_pio_timings[pio].cycle_time - - adr_setup-data_pls, bus_speed); - if (clks->address_time < 1) - clks->address_time = 1; - if (clks->address_time > 4) - clks->address_time = 4; - if (clks->data_time < 1) - clks->data_time = 1; - if (clks->data_time > 16) - clks->data_time = 16; - if (clks->recovery_time < 2) - clks->recovery_time = 2; - if (clks->recovery_time > 17) - clks->recovery_time = 17; - } else { - clks->address_time = 1; - clks->data_time = 1; - clks->recovery_time = 2; - /* minimal values */ - } -} - static void opti621_set_pio_mode(ide_drive_t *drive, const u8 pio) { ide_hwif_t *hwif = drive->hwif; ide_drive_t *pair = ide_get_paired_drive(drive); unsigned long flags; - pio_clocks_t first, second; - int ax, drdy; - u8 cycle1, misc, clk, addr_pio = pio; + u8 tim, misc, addr_pio = pio, clk; + + /* DRDY is default 2 (by OPTi Databook) */ + static const u8 addr_timings[2][4] = { + { 0x20, 0x10, 0x00, 0x00 }, /* 33 MHz */ + { 0x10, 0x10, 0x00, 0x00 }, /* 25 MHz */ + }; + static const u8 data_rec_timings[2][4] = { + { 0x5b, 0x45, 0x32, 0x21 }, /* 33 MHz */ + { 0x48, 0x34, 0x21, 0x10 } /* 25 MHz */ + }; drive->drive_data = XFER_PIO_0 + pio; @@ -230,31 +184,15 @@ static void opti621_set_pio_mode(ide_drive_t *drive, const u8 pio) printk(KERN_INFO "%s: CLK = %d MHz\n", hwif->name, clk ? 25 : 33); - compute_clocks(pio, &first, clk ? 25 : 33); - compute_clocks(addr_pio, &second, clk ? 25 : 33); - - /* ax = max(a1,a2) */ - ax = (first.address_time < second.address_time) ? second.address_time : first.address_time; - - drdy = 2; /* DRDY is default 2 (by OPTi Databook) */ - - cycle1 = ((first.data_time-1)<<4) | (first.recovery_time-2); - - misc = ((ax - 1) << 4) | ((drdy - 2) << 1); - -#ifdef OPTI621_DEBUG - printk("%s: address: %d, data: %d, " - "recovery: %d, drdy: %d [clk]\n", - drive->name, ax, first.data_time, - first.recovery_time, drdy); -#endif + tim = data_rec_timings[clk][pio]; + misc = addr_timings[clk][addr_pio]; /* select Index-0/1 for Register-A/B */ write_reg(drive->select.b.unit, MISC_REG); /* set read cycle timings */ - write_reg(cycle1, READ_REG); + write_reg(tim, READ_REG); /* set write cycle timings */ - write_reg(cycle1, WRITE_REG); + write_reg(tim, WRITE_REG); /* use Register-A for drive 0 */ /* use Register-B for drive 1 */ |