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pata_hpt{37x|3x2n}: improve timing register documentation 

Describe UDMA timing bits 18-20 and 21 separately; add a note to bit
31 about it being meaningful for PIO only.  Reformat the whole comment,
while at it...

Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
This commit is contained in:
Sergei Shtylyov 2009-12-07 23:38:11 +04:00 committed by Jeff Garzik
parent 859faa875e
commit fd5e62e22d
2 changed files with 30 additions and 32 deletions
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31
drivers/ata/pata_hpt37x.c
View File

@ -39,25 +39,24 @@ struct hpt_chip {
/* key for bus clock timings
* bit
* 0:3 data_high_time. inactive time of DIOW_/DIOR_ for PIO and MW
* DMA. cycles = value + 1
* 4:8 data_low_time. active time of DIOW_/DIOR_ for PIO and MW
* DMA. cycles = value + 1
* 9:12 cmd_high_time. inactive time of DIOW_/DIOR_ during task file
* 0:3 data_high_time. Inactive time of DIOW_/DIOR_ for PIO and MW DMA.
* cycles = value + 1
* 4:8 data_low_time. Active time of DIOW_/DIOR_ for PIO and MW DMA.
* cycles = value + 1
* 9:12 cmd_high_time. Inactive time of DIOW_/DIOR_ during task file
* register access.
* 13:17 cmd_low_time. active time of DIOW_/DIOR_ during task file
* 13:17 cmd_low_time. Active time of DIOW_/DIOR_ during task file
* register access.
* 18:21 udma_cycle_time. clock freq and clock cycles for UDMA xfer.
* during task file register access.
* 22:24 pre_high_time. time to initialize 1st cycle for PIO and MW DMA
* xfer.
* 25:27 cmd_pre_high_time. time to initialize 1st PIO cycle for task
* 18:20 udma_cycle_time. Clock cycles for UDMA xfer.
* 21 CLK frequency for UDMA: 0=ATA clock, 1=dual ATA clock.
* 22:24 pre_high_time. Time to initialize 1st cycle for PIO and MW DMA xfer.
* 25:27 cmd_pre_high_time. Time to initialize 1st PIO cycle for task file
* register access.
* 28 UDMA enable
* 29 DMA enable
* 30 PIO_MST enable. if set, the chip is in bus master mode during
* PIO.
* 31 FIFO enable.
* 28 UDMA enable.
* 29 DMA enable.
* 30 PIO_MST enable. If set, the chip is in bus master mode during
* PIO xfer.
* 31 FIFO enable. Only for PIO.
*/
static struct hpt_clock hpt37x_timings_33[] = {

31
drivers/ata/pata_hpt3x2n.c
View File

@ -45,25 +45,24 @@ struct hpt_chip {
/* key for bus clock timings
* bit
* 0:3 data_high_time. inactive time of DIOW_/DIOR_ for PIO and MW
* DMA. cycles = value + 1
* 4:8 data_low_time. active time of DIOW_/DIOR_ for PIO and MW
* DMA. cycles = value + 1
* 9:12 cmd_high_time. inactive time of DIOW_/DIOR_ during task file
* 0:3 data_high_time. Inactive time of DIOW_/DIOR_ for PIO and MW DMA.
* cycles = value + 1
* 4:8 data_low_time. Active time of DIOW_/DIOR_ for PIO and MW DMA.
* cycles = value + 1
* 9:12 cmd_high_time. Inactive time of DIOW_/DIOR_ during task file
* register access.
* 13:17 cmd_low_time. active time of DIOW_/DIOR_ during task file
* 13:17 cmd_low_time. Active time of DIOW_/DIOR_ during task file
* register access.
* 18:21 udma_cycle_time. clock freq and clock cycles for UDMA xfer.
* during task file register access.
* 22:24 pre_high_time. time to initialize 1st cycle for PIO and MW DMA
* xfer.
* 25:27 cmd_pre_high_time. time to initialize 1st PIO cycle for task
* 18:20 udma_cycle_time. Clock cycles for UDMA xfer.
* 21 CLK frequency for UDMA: 0=ATA clock, 1=dual ATA clock.
* 22:24 pre_high_time. Time to initialize 1st cycle for PIO and MW DMA xfer.
* 25:27 cmd_pre_high_time. Time to initialize 1st PIO cycle for task file
* register access.
* 28 UDMA enable
* 29 DMA enable
* 30 PIO_MST enable. if set, the chip is in bus master mode during
* PIO.
* 31 FIFO enable.
* 28 UDMA enable.
* 29 DMA enable.
* 30 PIO_MST enable. If set, the chip is in bus master mode during
* PIO xfer.
* 31 FIFO enable. Only for PIO.
*/
/* 66MHz DPLL clocks */