1 files changed, 64 insertions, 0 deletions
diff --git a/chip/mec1322/pwm.c b/chip/mec1322/pwm.c
new file mode 100644
index 0000000000..d66c03da05
--- /dev/null
+++ b/chip/mec1322/pwm.c
@@ -0,0 +1,64 @@
+/* Copyright (c) 2013 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+/* PWM control module for MEC1322 */
+
+#include "hooks.h"
+#include "pwm.h"
+#include "pwm_chip.h"
+#include "registers.h"
+#include "util.h"
+
+void pwm_enable(enum pwm_channel ch, int enabled)
+{
+	int id = pwm_channels[ch].channel;
+
+	if (enabled)
+		MEC1322_PWM_CFG(id) |= 0x1;
+	else
+		MEC1322_PWM_CFG(id) &= ~0x1;
+}
+
+int pwm_get_enabled(enum pwm_channel ch)
+{
+	return MEC1322_PWM_CFG(pwm_channels[ch].channel) & 0x1;
+}
+
+void pwm_set_duty(enum pwm_channel ch, int percent)
+{
+	int id = pwm_channels[ch].channel;
+
+	if (percent < 0)
+		percent = 0;
+	else if (percent > 100)
+		percent = 100;
+
+	MEC1322_PWM_ON(id) = percent;
+	MEC1322_PWM_OFF(id) = 100 - percent;
+}
+
+int pwm_get_duty(enum pwm_channel ch)
+{
+	return MEC1322_PWM_ON(pwm_channels[ch].channel);
+}
+
+static void pwm_configure(int ch, int active_low)
+{
+	MEC1322_PWM_CFG(ch) = (15 << 3) |    /* Pre-divider = 16 */
+			      (active_low ? (1 << 2) : 0) |
+			      (0 << 1);      /* 48M clock */
+}
+
+static void pwm_init(void)
+{
+	int i;
+
+	for (i = 0; i < PWM_CH_COUNT; ++i) {
+		pwm_configure(pwm_channels[i].channel,
+			      pwm_channels[i].flags & PWM_CONFIG_ACTIVE_LOW);
+		pwm_set_duty(i, 0);
+	}
+}
+DECLARE_HOOK(HOOK_INIT, pwm_init, HOOK_PRIO_DEFAULT);