forked from mirrors/linux
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
/*
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* Copyright (C) 2013 Samsung Electronics Co., Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __CLOCKSOURCE_SAMSUNG_PWM_H
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#define __CLOCKSOURCE_SAMSUNG_PWM_H
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#include <linux/spinlock.h>
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#define SAMSUNG_PWM_NUM 5
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/*
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* Following declaration must be in an ifdef due to this symbol being static
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* in pwm-samsung driver if the clocksource driver is not compiled in and the
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* spinlock is not shared between both drivers.
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*/
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#ifdef CONFIG_CLKSRC_SAMSUNG_PWM
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extern spinlock_t samsung_pwm_lock;
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#endif
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struct samsung_pwm_variant {
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u8 bits;
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u8 div_base;
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u8 tclk_mask;
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u8 output_mask;
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bool has_tint_cstat;
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};
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void samsung_pwm_clocksource_init(void __iomem *base,
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unsigned int *irqs, struct samsung_pwm_variant *variant);
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#endif /* __CLOCKSOURCE_SAMSUNG_PWM_H */
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