From 288c95882d701bb09c77c8ad1a8904673503656c Mon Sep 17 00:00:00 2001 From: Alexandru Gagniuc Date: Mon, 14 Apr 2014 16:35:34 -0500 Subject: southbridge/hudson: Add support for ACPI enable/disable via SMI This enables the ACPI SMI command port in the FADT table, and sets up the hardware accordingly. If we have SMI enabled, then we don't set the SCI_EN bit at boot, causing the OS to send the ACPI_ENABLE command, as required by the ACPI spec. This gives us a chance to hook into the mainboard_smi_apmc() handler. Change-Id: Ib4c63d55b3132578dcae48bfe2092d4ea35821dd Signed-off-by: Alexandru Gagniuc Reviewed-on: http://review.coreboot.org/5511 Tested-by: build bot (Jenkins) Reviewed-by: Aaron Durbin --- src/southbridge/amd/agesa/hudson/smihandler.c | 28 +++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) (limited to 'src/southbridge/amd/agesa/hudson/smihandler.c') diff --git a/src/southbridge/amd/agesa/hudson/smihandler.c b/src/southbridge/amd/agesa/hudson/smihandler.c index 923fd93bf0..e762d0bb96 100644 --- a/src/southbridge/amd/agesa/hudson/smihandler.c +++ b/src/southbridge/amd/agesa/hudson/smihandler.c @@ -5,12 +5,14 @@ * Subject to the GNU GPL v2, or (at your option) any later version. */ +#include "hudson.h" #include "smi.h" #include #include #include +#define SMI_0x88_ACPI_COMMAND (1 << 11) enum smi_source { SMI_SOURCE_SCI = (1 << 0), @@ -21,6 +23,28 @@ enum smi_source { SMI_SOURCE_0x90 = (1 << 5) }; +static void hudson_apmc_smi_handler(void) +{ + u32 reg32; + const uint8_t cmd = inb(ACPI_SMI_CTL_PORT); + + switch (cmd) { + case ACPI_SMI_CMD_ENABLE: + reg32 = inl(ACPI_PM1_CNT_BLK); + reg32 |= (1 << 0); /* SCI_EN */ + outl(reg32, ACPI_PM1_CNT_BLK); + break; + case ACPI_SMI_CMD_DISABLE: + reg32 = inl(ACPI_PM1_CNT_BLK); + reg32 &= ~(1 << 0); /* clear SCI_EN */ + outl(ACPI_PM1_CNT_BLK, reg32); + break; + } + + if (mainboard_smi_apmc) + mainboard_smi_apmc(cmd); +} + int southbridge_io_trap_handler(int smif) { return 0; @@ -62,6 +86,10 @@ static void process_smi_0x88(void) { const uint32_t status = smi_read32(0x88); + if (status & SMI_0x88_ACPI_COMMAND) { + /* Command received via ACPI SMI command port */ + hudson_apmc_smi_handler(); + } /* Clear events to prevent re-entering SMI if event isn't handled */ smi_write32(0x88, status); } -- cgit v1.2.3