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authorTomasz Figa <t.figa@samsung.com>2013-04-20 23:22:13 +0200
committerArnd Bergmann <arnd@arndb.de>2013-04-21 00:21:05 +0200
commitf11899894c0a683c754ca71b45f7c9c3d35a3a1c (patch)
tree5e3ec9824da92d1f9394e09d3f4f9be6b4fbd182 /include/clocksource
parent3d5a96582303e28c48699f3faaf920ef7d43e6f2 (diff)
downloadlinux-stericsson-f11899894c0a683c754ca71b45f7c9c3d35a3a1c.tar.gz
clocksource: add samsung pwm timer driver
This adds a new clocksource driver for the PWM timer that is present in most Samsung SoCs, based on the existing driver in arch/arm/plat-samsung/samsung-time.c and many changes implemented by Tomasz Figa. Originally, the conversion of all Samsung machines to the new driver was planned for 3.10, but that work ended up being too late and too invasive just before the merge window. Unfortunately, other changes in the Exynos platform resulted in some Exynos4 setups, particularly the Universal C210 board to be broken. In order to fix that with minimum risk, so we now leave the existing pwm clocksource driver in place for all older platforms and use the new driver only for device tree enabled boards. This way, we can get the broken machines running again using DT descriptions. All clocksource changes were implemented by Tomasz, while the DT registration was rewritten by Arnd. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Tomasz Figa <t.figa@samsung.com> Cc: Kyungmin Park <kyungmin.park@samsung.com> Cc: Kukjin Kim <kgene.kim@samsung.com> Cc: Ben Dooks <ben-linux@fluff.org> Cc: John Stultz <john.stultz@linaro.org> Cc: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/clocksource')
-rw-r--r--include/clocksource/samsung_pwm.h41
1 files changed, 41 insertions, 0 deletions
diff --git a/include/clocksource/samsung_pwm.h b/include/clocksource/samsung_pwm.h
new file mode 100644
index 000000000000..eff8668da252
--- /dev/null
+++ b/include/clocksource/samsung_pwm.h
@@ -0,0 +1,41 @@
+/*
+ * Copyright (C) 2013 Samsung Electronics Co., Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+#ifndef __CLOCKSOURCE_SAMSUNG_PWM_H
+#define __CLOCKSOURCE_SAMSUNG_PWM_H
+
+#include <linux/spinlock.h>
+
+#define SAMSUNG_PWM_NUM 5
+
+struct platform_device;
+struct device_node;
+
+struct samsung_pwm_variant {
+ u8 bits;
+ u8 div_base;
+ u8 tclk_mask;
+ u8 output_mask;
+ bool has_tint_cstat;
+};
+
+struct samsung_pwm {
+ struct samsung_pwm_variant variant;
+ spinlock_t slock;
+ void __iomem *base;
+ int irq[SAMSUNG_PWM_NUM];
+};
+
+#endif /* __CLOCKSOURCE_SAMSUNG_PWM_H */