diff options
author | Stefan Bosch <stefan_b@posteo.net> | 2020-07-10 19:07:31 +0200 |
---|---|---|
committer | Tom Rini <trini@konsulko.com> | 2020-07-29 08:43:40 -0400 |
commit | 18284c1d56bfe2b51484561881377489ffa86c3b (patch) | |
tree | 4f9cdf083c0177de121c0ad267df11331ba6435d /arch/arm/cpu | |
parent | 8d393b2c2278c846d26d59b37a2b46d3bcdb1663 (diff) |
pwm: add driver for nexell
Changes in relation to FriendlyARM's U-Boot nanopi2-v2016.01:
- Since drivers/pwm/pwm-nexell.c is an adapted version of
s5p-common/pwm.c an appropriately changed version of s5p-common/pwm.c
is used instead. Therefore arch/arm/mach-s5pc1xx/include/mach/pwm.h
copied to arch/arm/mach-nexell/include/mach and s5p-common/Makefile
changed appropriately.
- '#ifdef CONFIG...' changed to 'if (IS_ENABLED(CONFIG...))' where
possible (and similar).
Signed-off-by: Stefan Bosch <stefan_b@posteo.net>
Diffstat (limited to 'arch/arm/cpu')
-rw-r--r-- | arch/arm/cpu/armv7/s5p-common/Makefile | 13 | ||||
-rw-r--r-- | arch/arm/cpu/armv7/s5p-common/pwm.c | 57 |
2 files changed, 65 insertions, 5 deletions
diff --git a/arch/arm/cpu/armv7/s5p-common/Makefile b/arch/arm/cpu/armv7/s5p-common/Makefile index 12cf804e88..bfe02389cd 100644 --- a/arch/arm/cpu/armv7/s5p-common/Makefile +++ b/arch/arm/cpu/armv7/s5p-common/Makefile @@ -3,9 +3,14 @@ # Copyright (C) 2009 Samsung Electronics # Minkyu Kang <mk7.kang@samsung.com> -obj-y += cpu_info.o +ifdef CONFIG_ARCH_NEXELL +obj-$(CONFIG_PWM_NX) += pwm.o +obj-$(CONFIG_S5P4418_ONEWIRE) += pwm.o +else +obj-y += cpu_info.o ifndef CONFIG_SPL_BUILD -obj-y += timer.o -obj-y += sromc.o -obj-$(CONFIG_PWM) += pwm.o +obj-y += timer.o +obj-y += sromc.o +obj-$(CONFIG_PWM) += pwm.o +endif endif diff --git a/arch/arm/cpu/armv7/s5p-common/pwm.c b/arch/arm/cpu/armv7/s5p-common/pwm.c index 6b9e865803..aef2e5574b 100644 --- a/arch/arm/cpu/armv7/s5p-common/pwm.c +++ b/arch/arm/cpu/armv7/s5p-common/pwm.c @@ -15,7 +15,11 @@ int pwm_enable(int pwm_id) { const struct s5p_timer *pwm = +#if defined(CONFIG_ARCH_NEXELL) + (struct s5p_timer *)PHY_BASEADDR_PWM; +#else (struct s5p_timer *)samsung_get_base_timer(); +#endif unsigned long tcon; tcon = readl(&pwm->tcon); @@ -29,7 +33,11 @@ int pwm_enable(int pwm_id) void pwm_disable(int pwm_id) { const struct s5p_timer *pwm = +#if defined(CONFIG_ARCH_NEXELL) + (struct s5p_timer *)PHY_BASEADDR_PWM; +#else (struct s5p_timer *)samsung_get_base_timer(); +#endif unsigned long tcon; tcon = readl(&pwm->tcon); @@ -43,14 +51,43 @@ static unsigned long pwm_calc_tin(int pwm_id, unsigned long freq) unsigned long tin_parent_rate; unsigned int div; +#if defined(CONFIG_ARCH_NEXELL) + unsigned int pre_div; + const struct s5p_timer *pwm = + (struct s5p_timer *)PHY_BASEADDR_PWM; + unsigned int val; + struct clk *clk = clk_get(CORECLK_NAME_PCLK); + + tin_parent_rate = clk_get_rate(clk); +#else tin_parent_rate = get_pwm_clk(); +#endif + +#if defined(CONFIG_ARCH_NEXELL) + writel(0, &pwm->tcfg0); + val = readl(&pwm->tcfg0); + + if (pwm_id < 2) + div = ((val >> 0) & 0xff) + 1; + else + div = ((val >> 8) & 0xff) + 1; + writel(0, &pwm->tcfg1); + val = readl(&pwm->tcfg1); + val = (val >> MUX_DIV_SHIFT(pwm_id)) & 0xF; + pre_div = (1UL << val); + + freq = tin_parent_rate / div / pre_div; + + return freq; +#else for (div = 2; div <= 16; div *= 2) { if ((tin_parent_rate / (div << 16)) < freq) return tin_parent_rate / div; } return tin_parent_rate / 16; +#endif } #define NS_IN_SEC 1000000000UL @@ -58,7 +95,11 @@ static unsigned long pwm_calc_tin(int pwm_id, unsigned long freq) int pwm_config(int pwm_id, int duty_ns, int period_ns) { const struct s5p_timer *pwm = +#if defined(CONFIG_ARCH_NEXELL) + (struct s5p_timer *)PHY_BASEADDR_PWM; +#else (struct s5p_timer *)samsung_get_base_timer(); +#endif unsigned int offset; unsigned long tin_rate; unsigned long tin_ns; @@ -84,7 +125,12 @@ int pwm_config(int pwm_id, int duty_ns, int period_ns) tin_rate = pwm_calc_tin(pwm_id, frequency); tin_ns = NS_IN_SEC / tin_rate; - tcnt = period_ns / tin_ns; + + if (IS_ENABLED(CONFIG_ARCH_NEXELL)) + /* The counter starts at zero. */ + tcnt = (period_ns / tin_ns) - 1; + else + tcnt = period_ns / tin_ns; /* Note, counters count down */ tcmp = duty_ns / tin_ns; @@ -115,7 +161,11 @@ int pwm_init(int pwm_id, int div, int invert) { u32 val; const struct s5p_timer *pwm = +#if defined(CONFIG_ARCH_NEXELL) + (struct s5p_timer *)PHY_BASEADDR_PWM; +#else (struct s5p_timer *)samsung_get_base_timer(); +#endif unsigned long ticks_per_period; unsigned int offset, prescaler; @@ -148,7 +198,12 @@ int pwm_init(int pwm_id, int div, int invert) ticks_per_period = -1UL; } else { const unsigned long pwm_hz = 1000; +#if defined(CONFIG_ARCH_NEXELL) + struct clk *clk = clk_get(CORECLK_NAME_PCLK); + unsigned long timer_rate_hz = clk_get_rate(clk) / +#else unsigned long timer_rate_hz = get_pwm_clk() / +#endif ((prescaler + 1) * (1 << div)); ticks_per_period = timer_rate_hz / pwm_hz; |