#define _IDE_TIMING_H
/*
- * $Id: ide-timing.h,v 1.6 2001/12/23 22:47:56 vojtech Exp $
- *
* Copyright (c) 1999-2001 Vojtech Pavlik
*/
* Vojtech Pavlik, Simunkova 1594, Prague 8, 182 00 Czech Republic
*/
+#include <linux/kernel.h>
#include <linux/hdreg.h>
#define XFER_PIO_5 0x0d
#define IDE_TIMING_UDMA 0x80
#define IDE_TIMING_ALL 0xff
-#define MIN(a,b) ((a)<(b)?(a):(b))
-#define MAX(a,b) ((a)>(b)?(a):(b))
-#define FIT(v,min,max) MAX(MIN(v,max),min)
-#define ENOUGH(v,unit) (((v)-1)/(unit)+1)
-#define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
+#define FIT(v,vmin,vmax) max_t(short,min_t(short,v,vmax),vmin)
+#define ENOUGH(v,unit) (((v)-1)/(unit)+1)
+#define EZ(v,unit) ((v)?ENOUGH(v,unit):0)
#define XFER_MODE 0xf0
-#define XFER_UDMA_133 0x48
-#define XFER_UDMA_100 0x44
-#define XFER_UDMA_66 0x42
-#define XFER_UDMA 0x40
#define XFER_MWDMA 0x20
-#define XFER_SWDMA 0x10
#define XFER_EPIO 0x01
#define XFER_PIO 0x00
-static short ide_find_best_mode(ide_drive_t *drive, int map)
-{
- struct hd_driveid *id = drive->id;
- short best = 0;
-
- if (!id)
- return XFER_PIO_SLOW;
-
- if ((map & XFER_UDMA) && (id->field_valid & 4)) { /* Want UDMA and UDMA bitmap valid */
-
- if ((map & XFER_UDMA_133) == XFER_UDMA_133)
- if ((best = (id->dma_ultra & 0x0040) ? XFER_UDMA_6 : 0)) return best;
-
- if ((map & XFER_UDMA_100) == XFER_UDMA_100)
- if ((best = (id->dma_ultra & 0x0020) ? XFER_UDMA_5 : 0)) return best;
-
- if ((map & XFER_UDMA_66) == XFER_UDMA_66)
- if ((best = (id->dma_ultra & 0x0010) ? XFER_UDMA_4 :
- (id->dma_ultra & 0x0008) ? XFER_UDMA_3 : 0)) return best;
-
- if ((best = (id->dma_ultra & 0x0004) ? XFER_UDMA_2 :
- (id->dma_ultra & 0x0002) ? XFER_UDMA_1 :
- (id->dma_ultra & 0x0001) ? XFER_UDMA_0 : 0)) return best;
- }
-
- if ((map & XFER_MWDMA) && (id->field_valid & 2)) { /* Want MWDMA and drive has EIDE fields */
-
- if ((best = (id->dma_mword & 0x0004) ? XFER_MW_DMA_2 :
- (id->dma_mword & 0x0002) ? XFER_MW_DMA_1 :
- (id->dma_mword & 0x0001) ? XFER_MW_DMA_0 : 0)) return best;
- }
-
- if (map & XFER_SWDMA) { /* Want SWDMA */
-
- if (id->field_valid & 2) { /* EIDE SWDMA */
-
- if ((best = (id->dma_1word & 0x0004) ? XFER_SW_DMA_2 :
- (id->dma_1word & 0x0002) ? XFER_SW_DMA_1 :
- (id->dma_1word & 0x0001) ? XFER_SW_DMA_0 : 0)) return best;
- }
-
- if (id->capability & 1) { /* Pre-EIDE style SWDMA */
-
- if ((best = (id->tDMA == 2) ? XFER_SW_DMA_2 :
- (id->tDMA == 1) ? XFER_SW_DMA_1 :
- (id->tDMA == 0) ? XFER_SW_DMA_0 : 0)) return best;
- }
- }
-
-
- if ((map & XFER_EPIO) && (id->field_valid & 2)) { /* EIDE PIO modes */
-
- if ((best = (drive->id->eide_pio_modes & 4) ? XFER_PIO_5 :
- (drive->id->eide_pio_modes & 2) ? XFER_PIO_4 :
- (drive->id->eide_pio_modes & 1) ? XFER_PIO_3 : 0)) return best;
- }
-
- return (drive->id->tPIO == 2) ? XFER_PIO_2 :
- (drive->id->tPIO == 1) ? XFER_PIO_1 :
- (drive->id->tPIO == 0) ? XFER_PIO_0 : XFER_PIO_SLOW;
-}
-
static void ide_timing_quantize(struct ide_timing *t, struct ide_timing *q, int T, int UT)
{
q->setup = EZ(t->setup * 1000, T);
static void ide_timing_merge(struct ide_timing *a, struct ide_timing *b, struct ide_timing *m, unsigned int what)
{
- if (what & IDE_TIMING_SETUP ) m->setup = MAX(a->setup, b->setup);
- if (what & IDE_TIMING_ACT8B ) m->act8b = MAX(a->act8b, b->act8b);
- if (what & IDE_TIMING_REC8B ) m->rec8b = MAX(a->rec8b, b->rec8b);
- if (what & IDE_TIMING_CYC8B ) m->cyc8b = MAX(a->cyc8b, b->cyc8b);
- if (what & IDE_TIMING_ACTIVE ) m->active = MAX(a->active, b->active);
- if (what & IDE_TIMING_RECOVER) m->recover = MAX(a->recover, b->recover);
- if (what & IDE_TIMING_CYCLE ) m->cycle = MAX(a->cycle, b->cycle);
- if (what & IDE_TIMING_UDMA ) m->udma = MAX(a->udma, b->udma);
+ if (what & IDE_TIMING_SETUP ) m->setup = max(a->setup, b->setup);
+ if (what & IDE_TIMING_ACT8B ) m->act8b = max(a->act8b, b->act8b);
+ if (what & IDE_TIMING_REC8B ) m->rec8b = max(a->rec8b, b->rec8b);
+ if (what & IDE_TIMING_CYC8B ) m->cyc8b = max(a->cyc8b, b->cyc8b);
+ if (what & IDE_TIMING_ACTIVE ) m->active = max(a->active, b->active);
+ if (what & IDE_TIMING_RECOVER) m->recover = max(a->recover, b->recover);
+ if (what & IDE_TIMING_CYCLE ) m->cycle = max(a->cycle, b->cycle);
+ if (what & IDE_TIMING_UDMA ) m->udma = max(a->udma, b->udma);
}
static struct ide_timing* ide_timing_find_mode(short speed)
if (!(s = ide_timing_find_mode(speed)))
return -EINVAL;
+/*
+ * Copy the timing from the table.
+ */
+
+ *t = *s;
+
/*
* If the drive is an EIDE drive, it can tell us it needs extended
* PIO/MWDMA cycle timing.
* Convert the timing to bus clock counts.
*/
- ide_timing_quantize(s, t, T, UT);
+ ide_timing_quantize(t, t, T, UT);
/*
* Even in DMA/UDMA modes we still use PIO access for IDENTIFY, S.M.A.R.T
*/
if ((speed & XFER_MODE) != XFER_PIO) {
- ide_timing_compute(drive, ide_find_best_mode(drive, XFER_PIO | XFER_EPIO), &p, T, UT);
+ u8 pio = ide_get_best_pio_mode(drive, 255, 5);
+ ide_timing_compute(drive, XFER_PIO_0 + pio, &p, T, UT);
ide_timing_merge(&p, t, t, IDE_TIMING_ALL);
}
/*
- * Lenghten active & recovery time so that cycle time is correct.
+ * Lengthen active & recovery time so that cycle time is correct.
*/
if (t->act8b + t->rec8b < t->cyc8b) {
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