imx233: add pwm driver

Change-Id: Ib920b119f52b492247d75e97c5ec9298146d583c

1 files changed, 64 insertions, 0 deletions

diff --git a/firmware/target/arm/imx233/pwm-imx233.c b/firmware/target/arm/imx233/pwm-imx233.c
new file mode 100644
index 0000000000..1c5e4657de
--- /dev/null
+++ b/firmware/target/arm/imx233/pwm-imx233.c
@@ -0,0 +1,64 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2011 by Amaury Pouly
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#include "pwm-imx233.h"
+#include "clkctrl-imx233.h"
+#include "pinctrl-imx233.h"
+
+void imx233_pwm_init(void)
+{
+    imx233_reset_block(&HW_PWM_CTRL);
+    imx233_clkctrl_enable_xtal(XTAM_PWM, true);
+}
+
+bool imx233_pwm_is_channel_enable(int channel)
+{
+    return HW_PWM_CTRL & HW_PWM_CTRL__PWMx_ENABLE(channel);
+}
+
+void imx233_pwm_enable_channel(int channel, bool enable)
+{
+    if(enable)
+        __REG_SET(HW_PWM_CTRL) = HW_PWM_CTRL__PWMx_ENABLE(channel);
+    else
+        __REG_CLR(HW_PWM_CTRL) = HW_PWM_CTRL__PWMx_ENABLE(channel);
+}
+
+void imx233_pwm_setup_channel(int channel, int period, int cdiv, int active,
+    int active_state, int inactive, int inactive_state)
+{
+    /* stop */
+    bool enable = imx233_pwm_is_channel_enable(channel);
+    if(enable)
+        imx233_pwm_enable_channel(channel, false);
+    /* setup pin */
+    imx233_set_pin_function(IMX233_PWM_PIN_BANK(channel), IMX233_PWM_PIN(channel),
+        PINCTRL_FUNCTION_MAIN);
+    imx233_set_pin_drive_strength(IMX233_PWM_PIN_BANK(channel), IMX233_PWM_PIN(channel),
+        PINCTRL_DRIVE_4mA);
+    /* watch the order ! active THEN period */
+    HW_PWM_ACTIVEx(channel) = active << HW_PWM_ACTIVEx__ACTIVE_BP |
+        inactive << HW_PWM_ACTIVEx__INACTIVE_BP;
+    HW_PWM_PERIODx(channel) = period | active_state << HW_PWM_PERIODx__ACTIVE_STATE_BP |
+        inactive_state << HW_PWM_PERIODx__INACTIVE_STATE_BP |
+        cdiv << HW_PWM_PERIODx__CDIV_BP;
+    /* restore */
+    imx233_pwm_enable_channel(channel, enable);
+}