mainboard/intel/galileo: Add I2C chip initialization
Add I2C chip initialization for the Galileo boards.
TEST=Build and run on Galileo Gen2
Change-Id: Ib5284d5cd7a67de2f3f98940837ceb2aa69af468
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/14829
Tested-by: build bot (Jenkins)
Reviewed-by: Martin Roth <martinroth@google.com>
diff --git a/src/mainboard/intel/galileo/gen1.h b/src/mainboard/intel/galileo/gen1.h
index c718b61..26335da 100644
--- a/src/mainboard/intel/galileo/gen1.h
+++ b/src/mainboard/intel/galileo/gen1.h
@@ -13,6 +13,9 @@
* GNU General Public License for more details.
*/
+/* Jumper J2 determines the slave address of Cypress I/O GPIO expander */
+#define GALILEO_DETERMINE_IOEXP_SLA_RESUMEWELL_GPIO 5
+
static const struct reg_script gen1_gpio_init[] = {
/* Initialize the legacy GPIO controller */
REG_LEG_GPIO_WRITE(R_QNC_GPIO_CGEN_CORE_WELL, 0x03),
@@ -49,5 +52,48 @@
/* Toggle the Cypress reset line */
REG_GPIO_OR(GPIO_SWPORTA_DR, BIT4),
REG_GPIO_AND(GPIO_SWPORTA_DR, ~BIT4),
+
+ 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
+ *
+ * I2C_SDA -> ANALOG_A4
+ * I2C_SCL -> ANALOG_A5
+ */
+ REG_I2C_WRITE(GEN1_I2C_GPIO_EXP_0x20, GEN1_GPIO_EXP_PORT_SELECT, 1),
+ REG_I2C_AND(GEN1_I2C_GPIO_EXP_0x20, GEN1_GPIO_EXP_PORT_DIR, ~BIT5),
+ REG_I2C_WRITE(GEN1_I2C_GPIO_EXP_0x20, GEN1_GPIO_EXP_OUTPUT1, ~BIT5),
+
+ /* Set all GPIO expander pins connected to the Reset Button as inputs
+ * Configure RESET_N_SHLD (GPORT5_BIT0) and SW_RESET_N_SHLD
+ * (GPORT5_BIT1) as inputs
+ */
+ REG_I2C_WRITE(GEN1_I2C_GPIO_EXP_0x20, GEN1_GPIO_EXP_PORT_SELECT, 5),
+ REG_I2C_OR(GEN1_I2C_GPIO_EXP_0x20, GEN1_GPIO_EXP_PORT_DIR, BIT1 | BIT0),
+
+ REG_SCRIPT_END
+};
+
+static const struct reg_script gen1_i2c_0x21_init[] = {
+ /* Route I2C pins to Arduino header:
+ * Clear I2C_MUX (GPORT1_BIT5) to route I2C to Arduino Shield connector
+ *
+ * I2C_SDA -> ANALOG_A4
+ * I2C_SCL -> ANALOG_A5
+ */
+ REG_I2C_WRITE(GEN1_I2C_GPIO_EXP_0x21, GEN1_GPIO_EXP_PORT_SELECT, 1),
+ 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_OUTPUT1, ~BIT5),
+
+ /* Set all GPIO expander pins connected to the Reset Button as inputs
+ * Configure RESET_N_SHLD (GPORT5_BIT0) and SW_RESET_N_SHLD
+ * (GPORT5_BIT1) as inputs
+ */
+ REG_I2C_WRITE(GEN1_I2C_GPIO_EXP_0x21, GEN1_GPIO_EXP_PORT_SELECT, 5),
+ REG_I2C_OR(GEN1_I2C_GPIO_EXP_0x21, GEN1_GPIO_EXP_PORT_DIR, BIT1 | BIT0),
+
REG_SCRIPT_END
};