11ad39ede2
This patch introduces new Samsung PWM driver, which is completely rewritten to be multiplatform- and DeviceTree-aware. In addition, remaining problems of old driver are fixed, such as: - proper handling of hardware variants, - synchronization on SMP systems, - handling of boundary parameter values, - hardware sharing with PWM clocksource driver, - undefined state of PWM output after stopping PWM channel. Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com> Reviewed-by: Sylwester Nawrocki <s.nawrocki@samsung.com> Tested-by: Heiko Stuebner <heiko@sntech.de> Tested-by: Mark Brown <broonie@linaro.org> Tested-by: Sylwester Nawrocki <sylvester.nawrocki@gmail.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Thierry Reding <thierry.reding@gmail.com>
43 lines
1.3 KiB
C
43 lines
1.3 KiB
C
/*
|
|
* 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
|
|
|
|
/*
|
|
* Following declaration must be in an ifdef due to this symbol being static
|
|
* in pwm-samsung driver if the clocksource driver is not compiled in and the
|
|
* spinlock is not shared between both drivers.
|
|
*/
|
|
#ifdef CONFIG_CLKSRC_SAMSUNG_PWM
|
|
extern spinlock_t samsung_pwm_lock;
|
|
#endif
|
|
|
|
struct samsung_pwm_variant {
|
|
u8 bits;
|
|
u8 div_base;
|
|
u8 tclk_mask;
|
|
u8 output_mask;
|
|
bool has_tint_cstat;
|
|
};
|
|
|
|
void samsung_pwm_clocksource_init(void __iomem *base,
|
|
unsigned int *irqs, struct samsung_pwm_variant *variant);
|
|
|
|
#endif /* __CLOCKSOURCE_SAMSUNG_PWM_H */
|