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-rw-r--r--src/ec/google/chromeec/ec_lpc.c83
1 files changed, 61 insertions, 22 deletions
diff --git a/src/ec/google/chromeec/ec_lpc.c b/src/ec/google/chromeec/ec_lpc.c
index 061c1032c1..f5f5434548 100644
--- a/src/ec/google/chromeec/ec_lpc.c
+++ b/src/ec/google/chromeec/ec_lpc.c
@@ -29,13 +29,74 @@
#include "ec.h"
#include "ec_commands.h"
+static int google_chromeec_wait_ready(u16 port)
+{
+ u8 ec_status = inb(port);
+ u32 time_count = 0;
+
+ /*
+ * One second is more than plenty for any EC operation to complete
+ * (and the bus accessing/code execution) overhead will make the
+ * timeout even longer.
+ */
+#define MAX_EC_TIMEOUT_US 1000000
+
+ while (ec_status &
+ (EC_LPC_CMDR_PENDING | EC_LPC_CMDR_BUSY)) {
+ udelay(1);
+ if (time_count++ == MAX_EC_TIMEOUT_US)
+ return -1;
+ ec_status = inb(port);
+ }
+ return 0;
+}
+
+#if CONFIG_EC_GOOGLE_CHROMEEC_ACPI_MEMMAP
+/* Read memmap data through ACPI port 66/62 */
+static int read_memmap(u8 *data, u8 offset)
+{
+ if (google_chromeec_wait_ready(EC_LPC_ADDR_ACPI_CMD)) {
+ printk(BIOS_ERR, "Timeout waiting for EC ready!\n");
+ return -1;
+ }
+
+ /* Issue the ACPI read command */
+ outb(EC_CMD_ACPI_READ, EC_LPC_ADDR_ACPI_CMD);
+
+ if (google_chromeec_wait_ready(EC_LPC_ADDR_ACPI_CMD)) {
+ printk(BIOS_ERR, "Timeout waiting for EC READ_EVENT!\n");
+ return -1;
+ }
+
+ /* Write data address */
+ outb(offset + EC_ACPI_MEM_MAPPED_BEGIN, EC_LPC_ADDR_ACPI_DATA);
+
+ if (google_chromeec_wait_ready(EC_LPC_ADDR_ACPI_CMD)) {
+ printk(BIOS_ERR, "Timeout waiting for EC DATA!\n");
+ return -1;
+ }
+
+ *data = inb(EC_LPC_ADDR_ACPI_DATA);
+ return 0;
+}
+#endif
+
static int google_chromeec_command_version(void)
{
u8 id1, id2, flags;
+#if CONFIG_EC_GOOGLE_CHROMEEC_ACPI_MEMMAP
+ if (read_memmap(&id1, EC_MEMMAP_ID) ||
+ read_memmap(&id2, EC_MEMMAP_ID + 1) ||
+ read_memmap(&flags, EC_MEMMAP_HOST_CMD_FLAGS)) {
+ printk(BIOS_ERR, "Error reading memmap data.\n");
+ return -1;
+ }
+#else
id1 = inb(EC_LPC_ADDR_MEMMAP + EC_MEMMAP_ID);
id2 = inb(EC_LPC_ADDR_MEMMAP + EC_MEMMAP_ID + 1);
flags = inb(EC_LPC_ADDR_MEMMAP + EC_MEMMAP_HOST_CMD_FLAGS);
+#endif
if (id1 != 'E' || id2 != 'C') {
printk(BIOS_ERR, "Missing Chromium EC memory map.\n");
@@ -53,28 +114,6 @@ static int google_chromeec_command_version(void)
}
}
-static int google_chromeec_wait_ready(u16 port)
-{
- u8 ec_status = inb(port);
- u32 time_count = 0;
-
- /*
- * One second is more than plenty for any EC operation to complete
- * (and the bus accessing/code execution) overhead will make the
- * timeout even longer.
- */
-#define MAX_EC_TIMEOUT_US 1000000
-
- while (ec_status &
- (EC_LPC_CMDR_PENDING | EC_LPC_CMDR_BUSY)) {
- udelay(1);
- if (time_count++ == MAX_EC_TIMEOUT_US)
- return -1;
- ec_status = inb(port);
- }
- return 0;
-}
-
static int google_chromeec_command_v3(struct chromeec_command *cec_command)
{
struct ec_host_request rq;