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Merge "Use udelay for more stable manual IRQ firing."

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This commit is contained in:
chrome-bot
2012-02-03 00:45:52 -08:00
committed by Gerrit Code Review
parent a72b9cc07e 088b79f285
commit 249467b9f2
1 changed files with 17 additions and 7 deletions
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24
chip/lm4/lpc.c
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@@ -14,6 +14,7 @@
#include "port80.h"
#include "registers.h"
#include "task.h"
#include "timer.h"
#include "uart.h"
@@ -37,6 +38,17 @@ static void configure_gpio(void)
}
static void wait_send_serirq(uint32_t lpcirqctl) {
LM4_LPC_LPCIRQCTL = lpcirqctl;
/* TODO: udelay() is not graceful. Since the SIRQRIS is almost not
* cleared in continuous mode and EC has problem to file
* more than 1 frame in the quiet mode, this is the best way
* we can do right now. */
udelay(4); /* 4 us is the time of 2 SERIRQ frames, which is long
* enough to guarantee the IRQ has been sent out. */
}
/* Manually generates an IRQ to host (edge-trigger).
*
* For SERIRQ quite mode, we need to set LM4_LPC_LPCIRQCTL twice.
@@ -51,13 +63,11 @@ void lpc_manual_irq(int irq_num) {
0x00000002 | /* ONCHG - for quiet mode */
0x00000001; /* SND - send immediately */
while (LM4_LPC_LPCIRQCTL & 1); /* wait until SND is cleared */
LM4_LPC_LPCIRQCTL = (1 << (irq_num + 16)) | common_bits;
/* send out the IRQ first. */
wait_send_serirq((1 << (irq_num + 16)) | common_bits);
while (LM4_LPC_LPCIRQCTL & 1); /* wait until SND is cleared */
LM4_LPC_LPCIRQCTL = common_bits; /* generate a all-high frame to
* simulate a rising edge. */
while (LM4_LPC_LPCIRQCTL & 1); /* wait until SND is cleared */
/* generate a all-high frame to simulate a rising edge. */
wait_send_serirq(common_bits);
}
@@ -174,7 +184,7 @@ void lpc_send_host_response(int slot, int status)
/* Return true if the TOH is still set */
int lpc_keyboard_has_char() {
int lpc_keyboard_has_char(void) {
return (LM4_LPC_ST(LPC_CH_KEYBOARD) & (1 << 0 /* TOH */)) ? 1 : 0;
}