2  *  Copyright (c) 1999-2001 Vojtech Pavlik
3  *  Copyright (c) 2007-2008 Bartlomiej Zolnierkiewicz
17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20  * e-mail - mail your message to <vojtech@ucw.cz>, or by paper mail:
29  * PIO 0-5, MWDMA 0-2 and UDMA 0-6 timings (in nanoseconds).
30  * These were taken from ATA/ATAPI-6 standard, rev 0a, except
70 struct ide_timing *ide_timing_find_mode(u8 speed)  in ide_timing_find_mode()  argument
74 	for (t = ide_timing; t->mode != speed; t++)  in ide_timing_find_mode()
75 		if (t->mode == 0xff)  in ide_timing_find_mode()
83 	u16 *id = drive->id;  in ide_pio_cycle_time()
88 		if (ata_id_has_iordy(drive->id))  in ide_pio_cycle_time()
93 		/* conservative "downgrade" for all pre-ATA2 drives */  in ide_pio_cycle_time()
94 		if (pio < 3 && cycle < t->cycle)  in ide_pio_cycle_time()
102 	return cycle ? cycle : t->cycle;  in ide_pio_cycle_time()
106 #define ENOUGH(v, unit)		(((v) - 1) / (unit) + 1)
112 	q->setup   = EZ(t->setup,   T);  in ide_timing_quantize()
113 	q->act8b   = EZ(t->act8b,   T);  in ide_timing_quantize()
114 	q->rec8b   = EZ(t->rec8b,   T);  in ide_timing_quantize()
115 	q->cyc8b   = EZ(t->cyc8b,   T);  in ide_timing_quantize()
116 	q->active  = EZ(t->active,  T);  in ide_timing_quantize()
117 	q->recover = EZ(t->recover, T);  in ide_timing_quantize()
118 	q->cycle   = EZ(t->cycle,   T);  in ide_timing_quantize()
119 	q->udma    = EZ(t->udma,    UT);  in ide_timing_quantize()
126 		m->setup   = max(a->setup,   b->setup);  in ide_timing_merge()
128 		m->act8b   = max(a->act8b,   b->act8b);  in ide_timing_merge()
130 		m->rec8b   = max(a->rec8b,   b->rec8b);  in ide_timing_merge()
132 		m->cyc8b   = max(a->cyc8b,   b->cyc8b);  in ide_timing_merge()
134 		m->active  = max(a->active,  b->active);  in ide_timing_merge()
136 		m->recover = max(a->recover, b->recover);  in ide_timing_merge()
138 		m->cycle   = max(a->cycle,   b->cycle);  in ide_timing_merge()
140 		m->udma    = max(a->udma,    b->udma);  in ide_timing_merge()
144 int ide_timing_compute(ide_drive_t *drive, u8 speed,  in ide_timing_compute()  argument
147 	u16 *id = drive->id;  in ide_timing_compute()
153 	s = ide_timing_find_mode(speed);  in ide_timing_compute()
155 		return -EINVAL;  in ide_timing_compute()
169 		if (speed >= XFER_PIO_0 && speed < XFER_SW_DMA_0) {  in ide_timing_compute()
170 			if (speed <= XFER_PIO_2)  in ide_timing_compute()
172 			else if ((speed <= XFER_PIO_4) ||  in ide_timing_compute()
173 				 (speed == XFER_PIO_5 && !ata_id_is_cfa(id)))  in ide_timing_compute()
175 		} else if (speed >= XFER_MW_DMA_0 && speed <= XFER_MW_DMA_2)  in ide_timing_compute()
191 	if (speed >= XFER_SW_DMA_0) {  in ide_timing_compute()
192 		ide_timing_compute(drive, drive->pio_mode, &p, T, UT);  in ide_timing_compute()
199 	if (t->act8b + t->rec8b < t->cyc8b) {  in ide_timing_compute()
200 		t->act8b += (t->cyc8b - (t->act8b + t->rec8b)) / 2;  in ide_timing_compute()
201 		t->rec8b = t->cyc8b - t->act8b;  in ide_timing_compute()
204 	if (t->active + t->recover < t->cycle) {  in ide_timing_compute()
205 		t->active += (t->cycle - (t->active + t->recover)) / 2;  in ide_timing_compute()
206 		t->recover = t->cycle - t->active;  in ide_timing_compute()