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Add a hook to allow board-specific PIO mode setting.

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This patch adds a hook whereby a board-specific routine can be called to
configure hardware for a PIO mode.  The prototype for the board-specific
routine is:

	int inline ide_set_piomode(int pio_mode)

ide_set_piomode should be prepared to configure hardware for a pio_mode
between 0 and 6, inclusive.  It should return 0 on success or 1 on failure.

Signed-off-by: Steven A. Falco <sfalco@harris.com>
This commit is contained in:
Steven A. Falco 2008-08-15 15:34:10 -04:00 committed by Wolfgang Denk
parent 9571b84cb1
commit 36c2d3062e
2 changed files with 49 additions and 1 deletions
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46
common/cmd_ide.c
View File

@ -543,6 +543,16 @@ __ide_inb(int dev, int port)
unsigned char inline ide_inb(int dev, int port)
__attribute__((weak, alias("__ide_inb")));
#ifdef CONFIG_TUNE_PIO
int inline
__ide_set_piomode(int pio_mode)
{
return 0;
}
int inline ide_set_piomode(int pio_mode)
__attribute__((weak, alias("__ide_set_piomode")));
#endif
void ide_init (void)
{
@ -1053,6 +1063,10 @@ static void ide_ident (block_dev_desc_t *dev_desc)
int do_retry = 0;
#endif
#ifdef CONFIG_TUNE_PIO
int pio_mode;
#endif
#if 0
int mode, cycle_time;
#endif
@ -1168,6 +1182,38 @@ static void ide_ident (block_dev_desc_t *dev_desc)
else
dev_desc->removable = 0;
#ifdef CONFIG_TUNE_PIO
/* Mode 0 - 2 only, are directly determined by word 51. */
pio_mode = iop->tPIO;
if (pio_mode > 2) {
printf("WARNING: Invalid PIO (word 51 = %d).\n", pio_mode);
pio_mode = 0; /* Force it to dead slow, and hope for the best... */
}
/* Any CompactFlash Storage Card that supports PIO mode 3 or above
* shall set bit 1 of word 53 to one and support the fields contained
* in words 64 through 70.
*/
if (iop->field_valid & 0x02) {
/* Mode 3 and above are possible. Check in order from slow
* to fast, so we wind up with the highest mode allowed.
*/
if (iop->eide_pio_modes & 0x01)
pio_mode = 3;
if (iop->eide_pio_modes & 0x02)
pio_mode = 4;
if (ata_id_is_cfa((u16 *)iop)) {
if ((iop->cf_advanced_caps & 0x07) == 0x01)
pio_mode = 5;
if ((iop->cf_advanced_caps & 0x07) == 0x02)
pio_mode = 6;
}
}
/* System-specific, depends on bus speeds, etc. */
ide_set_piomode(pio_mode);
#endif /* CONFIG_TUNE_PIO */
#if 0
/*
* Drive PIO mode autoselection

4
include/ata.h
View File

@ -236,7 +236,9 @@ typedef struct hd_driveid {
unsigned short words130_155[26];/* reserved vendor words 130-155 */
unsigned short word156;
unsigned short words157_159[3];/* reserved vendor words 157-159 */
unsigned short words160_255[95];/* reserved words 160-255 */
unsigned short words160_162[3];/* reserved words 160-162 */
unsigned short cf_advanced_caps;
unsigned short words164_255[92];/* reserved words 164-255 */
} hd_driveid_t;