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Date: Wed, 11 Jun 2008 22:00:44 +0200
From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To: linux-ide@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Juergen Kosel <juergen.kosel@....de>
Subject: [PATCH 5/6] opti621: use pre-calculated PIO timings
* Use pre-calculated PIO timings in ->set_pio_mode.
* Remove no longer needed compute_clocks(), cmpt_clk(), struct pio_clocks_s,
PIO_* defines and OPTI621_DEBUG define.
There should be no functional changes caused by this patch.
Based on a bugreport from Juergen Kosel & inspired by pata_opti.c code.
Tested-by: Juergen Kosel <juergen.kosel@....de>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
---
drivers/ide/pci/opti621.c | 92 +++++++---------------------------------------
1 file changed, 15 insertions(+), 77 deletions(-)
Index: b/drivers/ide/pci/opti621.c
===================================================================
--- 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_dri
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 */
--
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