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Watch LPC0RESET line and print changes

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For debugging PCH reset.

Signed-off-by: Randall Spangler <rspangler@chromium.org>

BUG=chrome-os-partner:8397
TEST=power system on, then use x86reset to reset it.  Should see line state changes printed.

Change-Id: Ief2f09bd0986339812183d0b32dc0208437d1103
This commit is contained in:
Randall Spangler
2012-03-13 12:53:52 -07:00
parent dcb1d1f929
commit eec896d6d8
1 changed files with 10 additions and 0 deletions
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10
chip/lm4/lpc.c
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@@ -149,6 +149,10 @@ int lpc_init(void)
* sensible to buffer input anyway. */
LM4_LPC_LPCIM |= LM4_LPC_INT_MASK(LPC_CH_COMX, 2);
/* Unmaksk LPC bus reset interrupt. This lets us monitor the PCH
* PLTRST# signal for debugging. */
LM4_LPC_LPCIM |= (1 << 31);
/* Enable LPC channels */
LM4_LPC_LPCCTL =
(1 << LPC_CH_KERNEL) |
@@ -372,6 +376,12 @@ static void lpc_interrupt(void)
uart_comx_putc(lpc_comx_get_char());
}
}
/* Debugging: print changes to LPC0RESET */
if (mis & (1 << 31)) {
uart_printf("[LPC PLTRST# %sasserted]\n",
(LM4_LPC_LPCSTS & (1<<10)) ? "" : "de");
}
}
DECLARE_IRQ(LM4_IRQ_LPC, lpc_interrupt, 2);