Commit b58f28f3 authored by Sugaya Taichi's avatar Sugaya Taichi Committed by Arnd Bergmann

clocksource/drivers/timer-milbeaut: Introduce timer for Milbeaut SoCs

Add timer driver for Milbeaut SoCs series.

The timer has two 32-bit width down counters, one of which is configured
as a clockevent device and the other is configured as a clock source.
Signed-off-by: default avatarSugaya Taichi <sugaya.taichi@socionext.com>
Acked-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
parent 172e9087
...@@ -634,4 +634,13 @@ config GX6605S_TIMER ...@@ -634,4 +634,13 @@ config GX6605S_TIMER
help help
This option enables support for gx6605s SOC's timer. This option enables support for gx6605s SOC's timer.
config MILBEAUT_TIMER
bool "Milbeaut timer driver" if COMPILE_TEST
depends on OF
depends on ARM
select TIMER_OF
select CLKSRC_MMIO
help
Enables the support for Milbeaut timer driver.
endmenu endmenu
...@@ -55,6 +55,7 @@ obj-$(CONFIG_CLKSRC_TI_32K) += timer-ti-32k.o ...@@ -55,6 +55,7 @@ obj-$(CONFIG_CLKSRC_TI_32K) += timer-ti-32k.o
obj-$(CONFIG_CLKSRC_NPS) += timer-nps.o obj-$(CONFIG_CLKSRC_NPS) += timer-nps.o
obj-$(CONFIG_OXNAS_RPS_TIMER) += timer-oxnas-rps.o obj-$(CONFIG_OXNAS_RPS_TIMER) += timer-oxnas-rps.o
obj-$(CONFIG_OWL_TIMER) += timer-owl.o obj-$(CONFIG_OWL_TIMER) += timer-owl.o
obj-$(CONFIG_MILBEAUT_TIMER) += timer-milbeaut.o
obj-$(CONFIG_SPRD_TIMER) += timer-sprd.o obj-$(CONFIG_SPRD_TIMER) += timer-sprd.o
obj-$(CONFIG_NPCM7XX_TIMER) += timer-npcm7xx.o obj-$(CONFIG_NPCM7XX_TIMER) += timer-npcm7xx.o
obj-$(CONFIG_RDA_TIMER) += timer-rda.o obj-$(CONFIG_RDA_TIMER) += timer-rda.o
......
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2018 Socionext Inc.
*/
#include <linux/clk.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqreturn.h>
#include <linux/sched_clock.h>
#include "timer-of.h"
#define MLB_TMR_TMCSR_OFS 0x0
#define MLB_TMR_TMR_OFS 0x4
#define MLB_TMR_TMRLR1_OFS 0x8
#define MLB_TMR_TMRLR2_OFS 0xc
#define MLB_TMR_REGSZPCH 0x10
#define MLB_TMR_TMCSR_OUTL BIT(5)
#define MLB_TMR_TMCSR_RELD BIT(4)
#define MLB_TMR_TMCSR_INTE BIT(3)
#define MLB_TMR_TMCSR_UF BIT(2)
#define MLB_TMR_TMCSR_CNTE BIT(1)
#define MLB_TMR_TMCSR_TRG BIT(0)
#define MLB_TMR_TMCSR_CSL_DIV2 0
#define MLB_TMR_DIV_CNT 2
#define MLB_TMR_SRC_CH (1)
#define MLB_TMR_EVT_CH (0)
#define MLB_TMR_SRC_CH_OFS (MLB_TMR_REGSZPCH * MLB_TMR_SRC_CH)
#define MLB_TMR_EVT_CH_OFS (MLB_TMR_REGSZPCH * MLB_TMR_EVT_CH)
#define MLB_TMR_SRC_TMCSR_OFS (MLB_TMR_SRC_CH_OFS + MLB_TMR_TMCSR_OFS)
#define MLB_TMR_SRC_TMR_OFS (MLB_TMR_SRC_CH_OFS + MLB_TMR_TMR_OFS)
#define MLB_TMR_SRC_TMRLR1_OFS (MLB_TMR_SRC_CH_OFS + MLB_TMR_TMRLR1_OFS)
#define MLB_TMR_SRC_TMRLR2_OFS (MLB_TMR_SRC_CH_OFS + MLB_TMR_TMRLR2_OFS)
#define MLB_TMR_EVT_TMCSR_OFS (MLB_TMR_EVT_CH_OFS + MLB_TMR_TMCSR_OFS)
#define MLB_TMR_EVT_TMR_OFS (MLB_TMR_EVT_CH_OFS + MLB_TMR_TMR_OFS)
#define MLB_TMR_EVT_TMRLR1_OFS (MLB_TMR_EVT_CH_OFS + MLB_TMR_TMRLR1_OFS)
#define MLB_TMR_EVT_TMRLR2_OFS (MLB_TMR_EVT_CH_OFS + MLB_TMR_TMRLR2_OFS)
#define MLB_TIMER_RATING 500
static irqreturn_t mlb_timer_interrupt(int irq, void *dev_id)
{
struct clock_event_device *clk = dev_id;
struct timer_of *to = to_timer_of(clk);
u32 val;
val = readl_relaxed(timer_of_base(to) + MLB_TMR_EVT_TMCSR_OFS);
val &= ~MLB_TMR_TMCSR_UF;
writel_relaxed(val, timer_of_base(to) + MLB_TMR_EVT_TMCSR_OFS);
clk->event_handler(clk);
return IRQ_HANDLED;
}
static int mlb_set_state_periodic(struct clock_event_device *clk)
{
struct timer_of *to = to_timer_of(clk);
u32 val = MLB_TMR_TMCSR_CSL_DIV2;
writel_relaxed(val, timer_of_base(to) + MLB_TMR_EVT_TMCSR_OFS);
writel_relaxed(to->of_clk.period, timer_of_base(to) +
MLB_TMR_EVT_TMRLR1_OFS);
val |= MLB_TMR_TMCSR_RELD | MLB_TMR_TMCSR_CNTE |
MLB_TMR_TMCSR_TRG | MLB_TMR_TMCSR_INTE;
writel_relaxed(val, timer_of_base(to) + MLB_TMR_EVT_TMCSR_OFS);
return 0;
}
static int mlb_set_state_oneshot(struct clock_event_device *clk)
{
struct timer_of *to = to_timer_of(clk);
u32 val = MLB_TMR_TMCSR_CSL_DIV2;
writel_relaxed(val, timer_of_base(to) + MLB_TMR_EVT_TMCSR_OFS);
return 0;
}
static int mlb_clkevt_next_event(unsigned long event,
struct clock_event_device *clk)
{
struct timer_of *to = to_timer_of(clk);
writel_relaxed(event, timer_of_base(to) + MLB_TMR_EVT_TMRLR1_OFS);
writel_relaxed(MLB_TMR_TMCSR_CSL_DIV2 |
MLB_TMR_TMCSR_CNTE | MLB_TMR_TMCSR_INTE |
MLB_TMR_TMCSR_TRG, timer_of_base(to) +
MLB_TMR_EVT_TMCSR_OFS);
return 0;
}
static int mlb_config_clock_source(struct timer_of *to)
{
writel_relaxed(0, timer_of_base(to) + MLB_TMR_SRC_TMCSR_OFS);
writel_relaxed(~0, timer_of_base(to) + MLB_TMR_SRC_TMR_OFS);
writel_relaxed(~0, timer_of_base(to) + MLB_TMR_SRC_TMRLR1_OFS);
writel_relaxed(~0, timer_of_base(to) + MLB_TMR_SRC_TMRLR2_OFS);
writel_relaxed(BIT(4) | BIT(1) | BIT(0), timer_of_base(to) +
MLB_TMR_SRC_TMCSR_OFS);
return 0;
}
static int mlb_config_clock_event(struct timer_of *to)
{
writel_relaxed(0, timer_of_base(to) + MLB_TMR_EVT_TMCSR_OFS);
return 0;
}
static struct timer_of to = {
.flags = TIMER_OF_IRQ | TIMER_OF_BASE | TIMER_OF_CLOCK,
.clkevt = {
.name = "mlb-clkevt",
.rating = MLB_TIMER_RATING,
.cpumask = cpu_possible_mask,
.features = CLOCK_EVT_FEAT_DYNIRQ | CLOCK_EVT_FEAT_ONESHOT,
.set_state_oneshot = mlb_set_state_oneshot,
.set_state_periodic = mlb_set_state_periodic,
.set_next_event = mlb_clkevt_next_event,
},
.of_irq = {
.flags = IRQF_TIMER | IRQF_IRQPOLL,
.handler = mlb_timer_interrupt,
},
};
static u64 notrace mlb_timer_sched_read(void)
{
return ~readl_relaxed(timer_of_base(&to) + MLB_TMR_SRC_TMR_OFS);
}
static int __init mlb_timer_init(struct device_node *node)
{
int ret;
unsigned long rate;
ret = timer_of_init(node, &to);
if (ret)
return ret;
rate = timer_of_rate(&to) / MLB_TMR_DIV_CNT;
mlb_config_clock_source(&to);
clocksource_mmio_init(timer_of_base(&to) + MLB_TMR_SRC_TMR_OFS,
node->name, rate, MLB_TIMER_RATING, 32,
clocksource_mmio_readl_down);
sched_clock_register(mlb_timer_sched_read, 32, rate);
mlb_config_clock_event(&to);
clockevents_config_and_register(&to.clkevt, timer_of_rate(&to), 15,
0xffffffff);
return 0;
}
TIMER_OF_DECLARE(mlb_peritimer, "socionext,milbeaut-timer",
mlb_timer_init);
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment