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ESP: fix breakage by r667, status getting erased by interrupt register read

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Reading the interrupt status register clears also status register, therefore
the interrupt status must be read only after reading the status.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

git-svn-id: svn://coreboot.org/openbios/trunk/openbios-devel@666 f158a5a8-5612-0410-a976-696ce0be7e32
This commit is contained in:
Blue Swirl
2010-01-16 10:35:58 +00:00
parent d3aebe27d3
commit 9e7cb441f2
1 changed files with 4 additions and 7 deletions
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11
drivers/esp.c
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@@ -101,11 +101,10 @@ do_command(esp_private_t *esp, sd_private_t *sd, int cmdlen, int replylen)
esp->ll->regs[ESP_CMD] = ESP_CMD_SELA | ESP_CMD_DMA;
// Wait for DMA to complete. Can this fail?
while ((esp->espdma.regs->cond_reg & DMA_HNDL_INTR) == 0) /* no-op */;
// Clear interrupts to avoid guests seeing spurious interrupts
(void)esp->ll->regs[ESP_INTRPT];
// Check status
status = esp->ll->regs[ESP_STATUS];
// Clear interrupts to avoid guests seeing spurious interrupts
(void)esp->ll->regs[ESP_INTRPT];
DPRINTF("do_command: id %d, cmd[0] 0x%x, status 0x%x\n", sd->id, esp->buffer[0], status);
@@ -127,12 +126,10 @@ do_command(esp_private_t *esp, sd_private_t *sd, int cmdlen, int replylen)
esp->ll->regs[ESP_CMD] = ESP_CMD_TI | ESP_CMD_DMA;
// Wait for DMA to complete
while ((esp->espdma.regs->cond_reg & DMA_HNDL_INTR) == 0) /* no-op */;
// Clear interrupts to avoid guests seeing spurious interrupts
(void)esp->ll->regs[ESP_INTRPT];
// Check status
status = esp->ll->regs[ESP_STATUS];
// Clear interrupts to avoid guests seeing spurious interrupts
(void)esp->ll->regs[ESP_INTRPT];
DPRINTF("do_command_reply: status 0x%x\n", status);