pwm: Add PWM driver for OMAP using dual-mode timers

Adds support for using a OMAP dual-mode timer with PWM capability
as a Linux PWM device. The driver controls the timer by using the
dmtimer API.

Add a platform_data structure for each pwm-omap-dmtimer nodes containing
the dmtimers functions in order to get driver not rely on platform
specific functions.

Cc: Grant Erickson <marathon96@gmail.com>
Cc: NeilBrown <neilb@suse.de>
Cc: Joachim Eastwood <manabian@gmail.com>
Suggested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Tony Lindgren <tony@atomide.com>
[thierry.reding@gmail.com: coding style bikeshed, fix timer leak]
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

1 files changed, 69 insertions, 0 deletions

diff --git a/include/linux/platform_data/pwm_omap_dmtimer.h b/include/linux/platform_data/pwm_omap_dmtimer.h
new file mode 100644
index 000000000000..59384217208f
--- /dev/null
+++ b/include/linux/platform_data/pwm_omap_dmtimer.h
@@ -0,0 +1,69 @@
+/*
+ * include/linux/platform_data/pwm_omap_dmtimer.h
+ *
+ * OMAP Dual-Mode Timer PWM platform data
+ *
+ * Copyright (C) 2010 Texas Instruments Incorporated - http://www.ti.com/
+ * Tarun Kanti DebBarma <tarun.kanti@ti.com>
+ * Thara Gopinath <thara@ti.com>
+ *
+ * Platform device conversion and hwmod support.
+ *
+ * Copyright (C) 2005 Nokia Corporation
+ * Author: Lauri Leukkunen <lauri.leukkunen@nokia.com>
+ * PWM and clock framework support by Timo Teras.
+ *
+ * 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 PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * You should have received a copy of the  GNU General Public License along
+ * with this program; if not, write  to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef __PWM_OMAP_DMTIMER_PDATA_H
+#define __PWM_OMAP_DMTIMER_PDATA_H
+
+/* trigger types */
+#define PWM_OMAP_DMTIMER_TRIGGER_NONE                   0x00
+#define PWM_OMAP_DMTIMER_TRIGGER_OVERFLOW               0x01
+#define PWM_OMAP_DMTIMER_TRIGGER_OVERFLOW_AND_COMPARE   0x02
+
+struct omap_dm_timer;
+typedef struct omap_dm_timer pwm_omap_dmtimer;
+
+struct pwm_omap_dmtimer_pdata {
+        pwm_omap_dmtimer *(*request_by_node)(struct device_node *np);
+        int     (*free)(pwm_omap_dmtimer *timer);
+
+        void    (*enable)(pwm_omap_dmtimer *timer);
+        void    (*disable)(pwm_omap_dmtimer *timer);
+
+        struct clk *(*get_fclk)(pwm_omap_dmtimer *timer);
+
+        int     (*start)(pwm_omap_dmtimer *timer);
+        int     (*stop)(pwm_omap_dmtimer *timer);
+
+        int     (*set_load)(pwm_omap_dmtimer *timer, int autoreload,
+                        unsigned int value);
+        int     (*set_match)(pwm_omap_dmtimer *timer, int enable,
+                        unsigned int match);
+        int     (*set_pwm)(pwm_omap_dmtimer *timer, int def_on,
+                        int toggle, int trigger);
+        int     (*set_prescaler)(pwm_omap_dmtimer *timer, int prescaler);
+
+        int     (*write_counter)(pwm_omap_dmtimer *timer, unsigned int value);
+};
+
+#endif /* __PWM_OMAP_DMTIMER_PDATA_H */