Add clock driver for RDA Micro RDA8810PL SoC supporting OSTIMER and HWTIMER.
Signed-off-by: Andreas Färber <[email protected]> Signed-off-by: Manivannan Sadhasivam <[email protected]> --- arch/arm/mach-rda/Kconfig | 1 + drivers/clocksource/Kconfig | 7 ++ drivers/clocksource/Makefile | 1 + drivers/clocksource/timer-rda.c | 187 ++++++++++++++++++++++++++++++++ 4 files changed, 196 insertions(+) create mode 100644 drivers/clocksource/timer-rda.c diff --git a/arch/arm/mach-rda/Kconfig b/arch/arm/mach-rda/Kconfig index 29012bc68ca4..1ea753f57b2d 100644 --- a/arch/arm/mach-rda/Kconfig +++ b/arch/arm/mach-rda/Kconfig @@ -4,5 +4,6 @@ menuconfig ARCH_RDA select COMMON_CLK select GENERIC_IRQ_CHIP select RDA_INTC + select RDA_TIMER help This enables support for the RDA Micro 8810PL SoC family. diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig index 55c77e44bb2d..f51eee3a72ea 100644 --- a/drivers/clocksource/Kconfig +++ b/drivers/clocksource/Kconfig @@ -105,6 +105,13 @@ config OWL_TIMER help Enables the support for the Actions Semi Owl timer driver. +config RDA_TIMER + bool "RDA timer driver" if COMPILE_TEST + depends on GENERIC_CLOCKEVENTS + select CLKSRC_MMIO + help + Enables the support for the RDA Micro timer driver. + config SUN4I_TIMER bool "Sun4i timer driver" if COMPILE_TEST depends on HAS_IOMEM diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile index dd9138104568..150020a90707 100644 --- a/drivers/clocksource/Makefile +++ b/drivers/clocksource/Makefile @@ -57,6 +57,7 @@ obj-$(CONFIG_OXNAS_RPS_TIMER) += timer-oxnas-rps.o obj-$(CONFIG_OWL_TIMER) += timer-owl.o obj-$(CONFIG_SPRD_TIMER) += timer-sprd.o obj-$(CONFIG_NPCM7XX_TIMER) += timer-npcm7xx.o +obj-$(CONFIG_RDA_TIMER) += timer-rda.o obj-$(CONFIG_ARC_TIMERS) += arc_timer.o obj-$(CONFIG_ARM_ARCH_TIMER) += arm_arch_timer.o diff --git a/drivers/clocksource/timer-rda.c b/drivers/clocksource/timer-rda.c new file mode 100644 index 000000000000..3aa684d92c5d --- /dev/null +++ b/drivers/clocksource/timer-rda.c @@ -0,0 +1,187 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * RDA8810PL SoC timer driver + * + * Copyright RDA Microelectronics Company Limited + * Copyright (c) 2017 Andreas Färber + * Copyright (c) 2018 Manivannan Sadhasivam + */ + +#include <linux/clockchips.h> +#include <linux/interrupt.h> +#include <linux/irq.h> +#include <linux/irqreturn.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> + +#define RDA_OSTIMER_LOADVAL_L 0x000 +#define RDA_OSTIMER_CTRL 0x004 +#define RDA_HWTIMER_LOCKVAL_L 0x024 +#define RDA_HWTIMER_LOCKVAL_H 0x028 +#define RDA_TIMER_IRQ_MASK_SET 0x02c +#define RDA_TIMER_IRQ_CLR 0x034 + +#define RDA_OSTIMER_CTRL_ENABLE BIT(24) +#define RDA_OSTIMER_CTRL_REPEAT BIT(28) +#define RDA_OSTIMER_CTRL_LOAD BIT(30) + +#define RDA_TIMER_IRQ_MASK_SET_OSTIMER BIT(0) + +#define RDA_TIMER_IRQ_CLR_OSTIMER BIT(0) + +static void __iomem *rda_timer_base; + +static u64 rda_hwtimer_read(struct clocksource *cs) +{ + u32 lo, hi; + + /* Always read low 32 bits first */ + lo = readl(rda_timer_base + RDA_HWTIMER_LOCKVAL_L); + hi = readl(rda_timer_base + RDA_HWTIMER_LOCKVAL_H); + + return ((u64)hi << 32) | lo; +} + +static struct clocksource rda_clocksource = { + .name = "rda-timer", + .rating = 400, + .read = rda_hwtimer_read, + .mask = CLOCKSOURCE_MASK(64), + .flags = CLOCK_SOURCE_IS_CONTINUOUS, +}; + +static int rda_ostimer_start(bool periodic, u64 cycles) +{ + u32 ctrl, load_l; + + load_l = (u32)cycles; + ctrl = ((cycles >> 32) & 0xffffff); + ctrl |= RDA_OSTIMER_CTRL_LOAD | RDA_OSTIMER_CTRL_ENABLE; + if (periodic) + ctrl |= RDA_OSTIMER_CTRL_REPEAT; + + /* Enable ostimer interrupt first */ + writel(RDA_TIMER_IRQ_MASK_SET_OSTIMER, + rda_timer_base + RDA_TIMER_IRQ_MASK_SET); + + /* Write low 32 bits first, high 24 bits are with ctrl */ + writel(load_l, rda_timer_base + RDA_OSTIMER_LOADVAL_L); + writel(ctrl, rda_timer_base + RDA_OSTIMER_CTRL); + + return 0; +} + +static int rda_ostimer_stop(void) +{ + /* Disable ostimer interrupt first */ + writel(0, rda_timer_base + RDA_TIMER_IRQ_MASK_SET); + + writel(0, rda_timer_base + RDA_OSTIMER_CTRL); + + return 0; +} + +static int rda_ostimer_set_state_shutdown(struct clock_event_device *evt) +{ + rda_ostimer_stop(); + + return 0; +} + +static int rda_ostimer_set_state_oneshot(struct clock_event_device *evt) +{ + rda_ostimer_stop(); + + return 0; +} + +static int rda_ostimer_set_state_periodic(struct clock_event_device *evt) +{ + unsigned long cycles_per_jiffy; + + rda_ostimer_stop(); + + cycles_per_jiffy = ((unsigned long long)NSEC_PER_SEC / HZ * + evt->mult) >> evt->shift; + rda_ostimer_start(true, cycles_per_jiffy); + + return 0; +} + +static int rda_ostimer_tick_resume(struct clock_event_device *evt) +{ + return 0; +} + +static int rda_ostimer_set_next_event(unsigned long evt, + struct clock_event_device *ev) +{ + rda_ostimer_start(false, evt); + + return 0; +} + +static struct clock_event_device rda_clockevent = { + .name = "rda-ostimer", + .rating = 250, + .features = CLOCK_EVT_FEAT_PERIODIC | + CLOCK_EVT_FEAT_ONESHOT | + CLOCK_EVT_FEAT_DYNIRQ, + .set_state_shutdown = rda_ostimer_set_state_shutdown, + .set_state_oneshot = rda_ostimer_set_state_oneshot, + .set_state_periodic = rda_ostimer_set_state_periodic, + .tick_resume = rda_ostimer_tick_resume, + .set_next_event = rda_ostimer_set_next_event, +}; + +static irqreturn_t rda_ostimer_interrupt(int irq, void *dev_id) +{ + struct clock_event_device *evt = dev_id; + + /* clear timer int */ + writel(RDA_TIMER_IRQ_CLR_OSTIMER, rda_timer_base + RDA_TIMER_IRQ_CLR); + + if (evt->event_handler) + evt->event_handler(evt); + + return IRQ_HANDLED; +} + +static int __init rda_timer_init(struct device_node *node) +{ + unsigned long rate = 2000000; + int ostimer_irq, ret; + + rda_timer_base = of_io_request_and_map(node, 0, "rda-timer"); + if (IS_ERR(rda_timer_base)) { + pr_err("Can't map timer registers"); + return PTR_ERR(rda_timer_base); + } + + ostimer_irq = of_irq_get_byname(node, "ostimer"); + if (ostimer_irq <= 0) { + pr_err("Can't parse ostimer IRQ"); + return -EINVAL; + } + + clocksource_register_hz(&rda_clocksource, rate); + + ret = request_irq(ostimer_irq, rda_ostimer_interrupt, IRQF_TIMER, + "rda-ostimer", &rda_clockevent); + if (ret) { + pr_err("failed to request irq %d\n", ostimer_irq); + return ret; + } + + irq_force_affinity(ostimer_irq, cpumask_of(0)); + + rda_clockevent.cpumask = cpumask_of(0); + rda_clockevent.irq = ostimer_irq; + clockevents_config_and_register(&rda_clockevent, rate, + 0x2, 0xffffffff); + + return 0; +} + +TIMER_OF_DECLARE(rda8810pl, "rda,8810pl-timer", rda_timer_init); -- 2.17.1
