quark: Enable HSUART0 as console

The use of HSUART0 on galileo requires early initialization of the I2C
GPIO expanders to direct the RXD and TXD signals to DIGITAL 0 and 1
on the expansion connector.

TEST=None

Change-Id: I11195d79e954c1f6bc91eafe257d7ddc1310b2e7
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/15010
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>

3 files changed, 97 insertions, 13 deletions

diff --git a/src/mainboard/intel/galileo/gen1.h b/src/mainboard/intel/galileo/gen1.h
index e1e8f59070..23b23091d2 100644
--- a/src/mainboard/intel/galileo/gen1.h
+++ b/src/mainboard/intel/galileo/gen1.h
@@ -59,6 +59,56 @@ static const struct reg_script gen1_gpio_init[] = {
 	REG_SCRIPT_END
 };
 
+static const struct reg_script gen1_hsuart0_0x20[] = {
+	/* Route UART0_TXD to LVL_TXD -> IO1 -> DIGITAL 1
+	 * Set IO1_MUX (EXP.PORT3_5) output, low
+	 * Set LVL_OE (GPIO_SUS2) output, high
+	 */
+
+	REG_I2C_WRITE(GEN1_I2C_GPIO_EXP_0x20, GEN1_GPIO_EXP_PORT_SELECT, 3),
+	REG_I2C_AND(GEN1_I2C_GPIO_EXP_0x20, GEN1_GPIO_EXP_PORT_DIR, ~BIT5),
+	REG_I2C_AND(GEN1_I2C_GPIO_EXP_0x20, GEN1_GPIO_EXP_OUTPUT3, ~BIT5),
+
+	/* Route DIGITAL 0 -> IO0 -> LVL_RXD -> UART0_RXD
+	 * Set IO0_MUX (EXP.PORT3_4) output, low
+	 * Set LVL_OE (GPIO_SUS2) output, high
+	 */
+	REG_I2C_WRITE(GEN1_I2C_GPIO_EXP_0x20, GEN1_GPIO_EXP_PORT_SELECT, 3),
+	REG_I2C_AND(GEN1_I2C_GPIO_EXP_0x20, GEN1_GPIO_EXP_PORT_DIR, ~BIT4),
+	REG_I2C_AND(GEN1_I2C_GPIO_EXP_0x20, GEN1_GPIO_EXP_OUTPUT3, ~BIT4),
+
+	REG_LEG_GPIO_OR(R_QNC_GPIO_RGEN_RESUME_WELL, BIT2),
+	REG_LEG_GPIO_AND(R_QNC_GPIO_RGIO_RESUME_WELL, ~BIT2),
+	REG_LEG_GPIO_OR(R_QNC_GPIO_RGLVL_RESUME_WELL, BIT2),
+
+	REG_SCRIPT_END
+};
+
+static const struct reg_script gen1_hsuart0_0x21[] = {
+	/* Route UART0_TXD to LVL_TXD -> IO1 -> DIGITAL 1
+	 * Set IO1_MUX (EXP.PORT3_5) output, low
+	 * Set LVL_OE (GPIO_SUS2) output, high
+	 */
+
+	REG_I2C_WRITE(GEN1_I2C_GPIO_EXP_0x21, GEN1_GPIO_EXP_PORT_SELECT, 3),
+	REG_I2C_AND(GEN1_I2C_GPIO_EXP_0x21, GEN1_GPIO_EXP_PORT_DIR, ~BIT5),
+	REG_I2C_AND(GEN1_I2C_GPIO_EXP_0x21, GEN1_GPIO_EXP_OUTPUT3, ~BIT5),
+
+	/* Route DIGITAL 0 -> IO0 -> LVL_RXD -> UART0_RXD
+	 * Set IO0_MUX (EXP.PORT3_4) output, low
+	 * Set LVL_OE (GPIO_SUS2) output, high
+	 */
+	REG_I2C_WRITE(GEN1_I2C_GPIO_EXP_0x21, GEN1_GPIO_EXP_PORT_SELECT, 3),
+	REG_I2C_AND(GEN1_I2C_GPIO_EXP_0x21, GEN1_GPIO_EXP_PORT_DIR, ~BIT4),
+	REG_I2C_AND(GEN1_I2C_GPIO_EXP_0x21, GEN1_GPIO_EXP_OUTPUT3, ~BIT4),
+
+	REG_LEG_GPIO_OR(R_QNC_GPIO_RGEN_RESUME_WELL, BIT2),
+	REG_LEG_GPIO_AND(R_QNC_GPIO_RGIO_RESUME_WELL, ~BIT2),
+	REG_LEG_GPIO_OR(R_QNC_GPIO_RGLVL_RESUME_WELL, BIT2),
+
+	REG_SCRIPT_END
+};
+
 static const struct reg_script gen1_i2c_0x20_init[] = {
 	/* Route I2C pins to Arduino header:
 	 * Clear I2C_MUX (GPORT1_BIT5) to route I2C to Arduino Shield connector
diff --git a/src/mainboard/intel/galileo/gen2.h b/src/mainboard/intel/galileo/gen2.h
index 8eee744392..10c832198e 100644
--- a/src/mainboard/intel/galileo/gen2.h
+++ b/src/mainboard/intel/galileo/gen2.h
@@ -52,6 +52,28 @@ static const struct reg_script gen2_gpio_init[] = {
 	REG_SCRIPT_END
 };
 
+static const struct reg_script gen2_hsuart0[] = {
+	/* Route UART0_TXD to MUX7_Y -> BUF_IO1 -> IO1 -> DIGITAL 1
+	 * Set MUX7_SEL (EXP1.P1_5) high
+	 * Configure MUX7_SEL (EXP1.P1_5) as an output
+	 * Set LVL_B_OE6_N (EXP0.P1_4) low
+	 * Configure LVL_B_OE6_N (EXP0.P1_4) as an output
+	 */
+	REG_I2C_OR(GEN2_I2C_GPIO_EXP1, GEN2_GPIO_EXP_OUTPUT1, BIT5),
+	REG_I2C_AND(GEN2_I2C_GPIO_EXP1, GEN2_GPIO_EXP_CONFIG1, ~BIT5),
+	REG_I2C_AND(GEN2_I2C_GPIO_EXP0, GEN2_GPIO_EXP_OUTPUT1, ~BIT4),
+	REG_I2C_AND(GEN2_I2C_GPIO_EXP0, GEN2_GPIO_EXP_CONFIG1, ~BIT4),
+
+	/* Route DIGITAL 0 -> IO0 -> UART0_RXD
+	 * Set LVL_C_OE0_N (EXP1.P0_0) high
+	 * Configure LVL_C_OE0_N (EXP1.P0_0) as an output
+	 */
+	REG_I2C_OR(GEN2_I2C_GPIO_EXP1, GEN2_GPIO_EXP_OUTPUT0, BIT0),
+	REG_I2C_AND(GEN2_I2C_GPIO_EXP1, GEN2_GPIO_EXP_CONFIG0, ~BIT0),
+
+	REG_SCRIPT_END
+};
+
 static const struct reg_script gen2_i2c_init[] = {
 	/* Route I2C to Arduino Shield connector:
 	 * Set AMUX1_IN (EXP2.P1_4) low
diff --git a/src/mainboard/intel/galileo/gpio.c b/src/mainboard/intel/galileo/gpio.c
index 31843814c2..0b55bc6ae2 100644
--- a/src/mainboard/intel/galileo/gpio.c
+++ b/src/mainboard/intel/galileo/gpio.c
@@ -15,11 +15,35 @@
 
 #include <arch/io.h>
 #include <console/console.h>
+#include <fsp/romstage.h>
 #include <soc/ramstage.h>
 #include "reg_access.h"
 #include "gen1.h"
 #include "gen2.h"
 
+void car_mainboard_pre_console_init(void)
+{
+	const struct reg_script *script;
+
+	/* Initialize the GPIO controllers */
+	if (IS_ENABLED(CONFIG_GALILEO_GEN2))
+		script = gen2_gpio_init;
+	else
+		script = gen1_gpio_init;
+	reg_script_run(script);
+
+	/* Initialize the RXD and TXD paths for UART0 */
+	if (IS_ENABLED(CONFIG_ENABLE_BUILTIN_HSUART0)) {
+		if (IS_ENABLED(CONFIG_GALILEO_GEN2))
+			script = gen2_hsuart0;
+		else
+			script = (reg_legacy_gpio_read (R_QNC_GPIO_RGLVL_RESUME_WELL)
+				& GALILEO_DETERMINE_IOEXP_SLA_RESUMEWELL_GPIO)
+				? gen1_hsuart0_0x21 : gen1_hsuart0_0x20;
+		reg_script_run(script);
+	}
+}
+
 void mainboard_gpio_i2c_init(device_t dev)
 {
 	const struct reg_script *script;
@@ -33,24 +57,12 @@ void mainboard_gpio_i2c_init(device_t dev)
 		/* Determine which I2C address is in use */
 		script = (reg_legacy_gpio_read (R_QNC_GPIO_RGLVL_RESUME_WELL)
 			& GALILEO_DETERMINE_IOEXP_SLA_RESUMEWELL_GPIO)
-			? gen1_i2c_0x20_init : gen1_i2c_0x21_init;
+			? gen1_i2c_0x21_init : gen1_i2c_0x20_init;
 
 	/* Initialize the I2C chips */
 	reg_script_run(script);
 }
 
-void mainboard_gpio_init(void)
-{
-	const struct reg_script *script;
-
-	/* Initialize the GPIO controllers */
-	if (IS_ENABLED(CONFIG_GALILEO_GEN2))
-		script = gen2_gpio_init;
-	else
-		script = gen1_gpio_init;
-	reg_script_run(script);
-}
-
 void mainboard_gpio_pcie_reset(uint32_t pin_value)
 {
 	uint32_t pin_number;