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AT91: Enable PLLB for USB

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At least some (old ?) versions of the AT91Bootstrap do not set up the
PLLB correctly to 48 MHz in order to make USB host function correctly.

This patch sets up the PLLB to the same values Linux uses, and makes USB
work ok on the following CPUs:
	- AT91CAP9
	- AT91SAM9260
	- AT91SAM9263

This patch also defines CONFIG_USB_STORAGE and CONFIG_CMD_FAT for all
the relevant AT91CAP9/AT91SAM9 atmel boards.

Signed-off-by: Stelian Pop <stelian@popies.net>
Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
This commit is contained in:
Stelian Pop
2008-11-09 00:14:46 +01:00
committed by Jean-Christophe PLAGNIOL-VILLARD
parent ad229a44e1
commit 3e0cda071a
6 changed files with 27 additions and 0 deletions
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18
cpu/arm926ejs/at91/usb.c
View File

@@ -31,6 +31,15 @@
int usb_cpu_init(void)
{
#if defined(CONFIG_AT91CAP9) || defined(CONFIG_AT91SAM9260) || \
defined(CONFIG_AT91SAM9263)
/* Enable PLLB */
at91_sys_write(AT91_CKGR_PLLBR, CFG_AT91_PLLB);
while ((at91_sys_read(AT91_PMC_SR) & AT91_PMC_LOCKB) != AT91_PMC_LOCKB)
;
#endif
/* Enable USB host clock. */
at91_sys_write(AT91_PMC_PCER, 1 << AT91_ID_UHP);
#ifdef CONFIG_AT91SAM9261
@@ -51,6 +60,15 @@ int usb_cpu_stop(void)
#else
at91_sys_write(AT91_PMC_SCDR, AT91_PMC_UHP);
#endif
#if defined(CONFIG_AT91CAP9) || defined(CONFIG_AT91SAM9260) || \
defined(CONFIG_AT91SAM9263)
/* Disable PLLB */
at91_sys_write(AT91_CKGR_PLLBR, 0);
while ((at91_sys_read(AT91_PMC_SR) & AT91_PMC_LOCKB) != 0)
;
#endif
return 0;
}