superio/ite/common: Add options to enable beeps

Add device tree options to enable beeps when exceeding temperature,
voltage, and fan limits. As of this commit, setting voltage and fan
limits is not implemented.

Change-Id: I57ce622ee4498b75f00e678c2e6d72e499925bce
Signed-off-by: Vagiz Trakhanov <rakkin@autistici.org>
Reviewed-on: https://review.coreboot.org/22141Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/superio/ite/common/env_ctrl.c

@@ -232,6 +232,30 @@ static void enable_fan(const u16 base, const u8 fan,
 	ite_ec_write(base, ITE_EC_FAN_MAIN_CTL, reg);
 }
 
+static void enable_beeps(const u16 base, const struct ite_ec_config *const conf)
+{
+	u8 reg = 0;
+	u8 freq = ITE_EC_BEEP_TONE_DIVISOR(10) | ITE_EC_BEEP_FREQ_DIVISOR(10);
+
+	if (conf->tmpin_beep) {
+		reg |= ITE_EC_BEEP_ON_TMP_LIMIT;
+		ite_ec_write(base, ITE_EC_BEEP_FREQ_DIV_OF_TMPIN, freq);
+	}
+	if (conf->fan_beep) {
+		reg |= ITE_EC_BEEP_ON_FAN_LIMIT;
+		ite_ec_write(base, ITE_EC_BEEP_FREQ_DIV_OF_FAN, freq);
+	}
+	if (conf->vin_beep) {
+		reg |= ITE_EC_BEEP_ON_VIN_LIMIT;
+		ite_ec_write(base, ITE_EC_BEEP_FREQ_DIV_OF_VIN, freq);
+	}
+
+	if (reg) {
+		reg |= ite_ec_read(base, ITE_EC_BEEP_ENABLE);
+		ite_ec_write(base, ITE_EC_BEEP_ENABLE, reg);
+	}
+}
+
 void ite_ec_init(const u16 base, const struct ite_ec_config *const conf)
 {
 	size_t i;
@@ -254,6 +278,9 @@ void ite_ec_init(const u16 base, const struct ite_ec_config *const conf)
 	for (i = 0; i < ITE_EC_FAN_CNT; ++i)
 		enable_fan(base, i + 1, &conf->fan[i]);
 
+	/* Enable beeps if configured */
+	enable_beeps(base, conf);
+
 	/*
 	 * System may get wrong temperature data when SIO is in
 	 * busy state. Therefore, check the status and terminate

src/superio/ite/common/env_ctrl.h

@@ -114,8 +114,10 @@ static const u8 ITE_EC_TEMP_ADJUST[] = { 0x56, 0x57, 0x59 };
 #define   ITE_EC_BEEP_ON_VIN_LIMIT		(1 << 1)
 #define   ITE_EC_BEEP_ON_FAN_LIMIT		(1 << 0)
 #define ITE_EC_BEEP_FREQ_DIV_OF_FAN		0x5D
-#define ITE_EC_BEEP_FREQ_DIV_OF_VOLT		0x5E
-#define ITE_EC_BEEP_FREQ_DIV_OF_TEMP		0x5F
+#define ITE_EC_BEEP_FREQ_DIV_OF_VIN		0x5E
+#define ITE_EC_BEEP_FREQ_DIV_OF_TMPIN		0x5F
+#define   ITE_EC_BEEP_TONE_DIVISOR(x)		(((x) & 0x0f) << 4)
+#define   ITE_EC_BEEP_FREQ_DIVISOR(x)		(((x) & 0x0f) << 0)
 
 #define ITE_EC_FAN_CTL_TEMP_LIMIT_OFF(x)	(0x60 + ((x)-1) * 8)
 #define ITE_EC_FAN_CTL_TEMP_LIMIT_START(x)	(0x61 + ((x)-1) * 8)

src/superio/ite/common/env_ctrl_chip.h

@@ -92,7 +92,9 @@ struct ite_ec_config {
 	 */
 	struct ite_ec_fan_config fan[ITE_EC_FAN_CNT];
 
-	/* FIXME: enable beep when exceeding TMPIN, VIN, FAN limits */
+	bool tmpin_beep;
+	bool fan_beep;
+	bool vin_beep;
 };
 
 /* Some shorthands for device trees */