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author | Daniel Lezcano <daniel.lezcano@linaro.org> | 2018-12-09 19:38:54 +0300 |
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committer | Daniel Lezcano <daniel.lezcano@linaro.org> | 2018-12-19 00:22:23 +0300 |
commit | 493d09b7a7f5b23f176b00f944ad77e9e0c84672 (patch) | |
tree | 7435e8951b3499a629177cbb83417a434d22bafe /drivers/clocksource/sun4i_timer.c | |
parent | f155ae2c35c9ea8ce52f3ac670ced0eb23eded19 (diff) | |
download | linux-493d09b7a7f5b23f176b00f944ad77e9e0c84672.tar.xz |
clocksource/drivers/sun4i: Change name sun4i_timer to timer-sun4i
In order to unify the names in this directory, let's rename the driver to be
prefixed with timer-*
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Diffstat (limited to 'drivers/clocksource/sun4i_timer.c')
-rw-r--r-- | drivers/clocksource/sun4i_timer.c | 220 |
1 files changed, 0 insertions, 220 deletions
diff --git a/drivers/clocksource/sun4i_timer.c b/drivers/clocksource/sun4i_timer.c deleted file mode 100644 index 6e0180aaf784..000000000000 --- a/drivers/clocksource/sun4i_timer.c +++ /dev/null @@ -1,220 +0,0 @@ -/* - * Allwinner A1X SoCs timer handling. - * - * Copyright (C) 2012 Maxime Ripard - * - * Maxime Ripard <maxime.ripard@free-electrons.com> - * - * Based on code from - * Allwinner Technology Co., Ltd. <www.allwinnertech.com> - * Benn Huang <benn@allwinnertech.com> - * - * This file is licensed under the terms of the GNU General Public - * License version 2. This program is licensed "as is" without any - * warranty of any kind, whether express or implied. - */ - -#include <linux/clk.h> -#include <linux/clockchips.h> -#include <linux/interrupt.h> -#include <linux/irq.h> -#include <linux/irqreturn.h> -#include <linux/sched_clock.h> -#include <linux/of.h> -#include <linux/of_address.h> -#include <linux/of_irq.h> - -#include "timer-of.h" - -#define TIMER_IRQ_EN_REG 0x00 -#define TIMER_IRQ_EN(val) BIT(val) -#define TIMER_IRQ_ST_REG 0x04 -#define TIMER_CTL_REG(val) (0x10 * val + 0x10) -#define TIMER_CTL_ENABLE BIT(0) -#define TIMER_CTL_RELOAD BIT(1) -#define TIMER_CTL_CLK_SRC(val) (((val) & 0x3) << 2) -#define TIMER_CTL_CLK_SRC_OSC24M (1) -#define TIMER_CTL_CLK_PRES(val) (((val) & 0x7) << 4) -#define TIMER_CTL_ONESHOT BIT(7) -#define TIMER_INTVAL_REG(val) (0x10 * (val) + 0x14) -#define TIMER_CNTVAL_REG(val) (0x10 * (val) + 0x18) - -#define TIMER_SYNC_TICKS 3 - -/* - * When we disable a timer, we need to wait at least for 2 cycles of - * the timer source clock. We will use for that the clocksource timer - * that is already setup and runs at the same frequency than the other - * timers, and we never will be disabled. - */ -static void sun4i_clkevt_sync(void __iomem *base) -{ - u32 old = readl(base + TIMER_CNTVAL_REG(1)); - - while ((old - readl(base + TIMER_CNTVAL_REG(1))) < TIMER_SYNC_TICKS) - cpu_relax(); -} - -static void sun4i_clkevt_time_stop(void __iomem *base, u8 timer) -{ - u32 val = readl(base + TIMER_CTL_REG(timer)); - writel(val & ~TIMER_CTL_ENABLE, base + TIMER_CTL_REG(timer)); - sun4i_clkevt_sync(base); -} - -static void sun4i_clkevt_time_setup(void __iomem *base, u8 timer, - unsigned long delay) -{ - writel(delay, base + TIMER_INTVAL_REG(timer)); -} - -static void sun4i_clkevt_time_start(void __iomem *base, u8 timer, - bool periodic) -{ - u32 val = readl(base + TIMER_CTL_REG(timer)); - - if (periodic) - val &= ~TIMER_CTL_ONESHOT; - else - val |= TIMER_CTL_ONESHOT; - - writel(val | TIMER_CTL_ENABLE | TIMER_CTL_RELOAD, - base + TIMER_CTL_REG(timer)); -} - -static int sun4i_clkevt_shutdown(struct clock_event_device *evt) -{ - struct timer_of *to = to_timer_of(evt); - - sun4i_clkevt_time_stop(timer_of_base(to), 0); - - return 0; -} - -static int sun4i_clkevt_set_oneshot(struct clock_event_device *evt) -{ - struct timer_of *to = to_timer_of(evt); - - sun4i_clkevt_time_stop(timer_of_base(to), 0); - sun4i_clkevt_time_start(timer_of_base(to), 0, false); - - return 0; -} - -static int sun4i_clkevt_set_periodic(struct clock_event_device *evt) -{ - struct timer_of *to = to_timer_of(evt); - - sun4i_clkevt_time_stop(timer_of_base(to), 0); - sun4i_clkevt_time_setup(timer_of_base(to), 0, timer_of_period(to)); - sun4i_clkevt_time_start(timer_of_base(to), 0, true); - - return 0; -} - -static int sun4i_clkevt_next_event(unsigned long evt, - struct clock_event_device *clkevt) -{ - struct timer_of *to = to_timer_of(clkevt); - - sun4i_clkevt_time_stop(timer_of_base(to), 0); - sun4i_clkevt_time_setup(timer_of_base(to), 0, evt - TIMER_SYNC_TICKS); - sun4i_clkevt_time_start(timer_of_base(to), 0, false); - - return 0; -} - -static void sun4i_timer_clear_interrupt(void __iomem *base) -{ - writel(TIMER_IRQ_EN(0), base + TIMER_IRQ_ST_REG); -} - -static irqreturn_t sun4i_timer_interrupt(int irq, void *dev_id) -{ - struct clock_event_device *evt = (struct clock_event_device *)dev_id; - struct timer_of *to = to_timer_of(evt); - - sun4i_timer_clear_interrupt(timer_of_base(to)); - evt->event_handler(evt); - - return IRQ_HANDLED; -} - -static struct timer_of to = { - .flags = TIMER_OF_IRQ | TIMER_OF_CLOCK | TIMER_OF_BASE, - - .clkevt = { - .name = "sun4i_tick", - .rating = 350, - .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT, - .set_state_shutdown = sun4i_clkevt_shutdown, - .set_state_periodic = sun4i_clkevt_set_periodic, - .set_state_oneshot = sun4i_clkevt_set_oneshot, - .tick_resume = sun4i_clkevt_shutdown, - .set_next_event = sun4i_clkevt_next_event, - .cpumask = cpu_possible_mask, - }, - - .of_irq = { - .handler = sun4i_timer_interrupt, - .flags = IRQF_TIMER | IRQF_IRQPOLL, - }, -}; - -static u64 notrace sun4i_timer_sched_read(void) -{ - return ~readl(timer_of_base(&to) + TIMER_CNTVAL_REG(1)); -} - -static int __init sun4i_timer_init(struct device_node *node) -{ - int ret; - u32 val; - - ret = timer_of_init(node, &to); - if (ret) - return ret; - - writel(~0, timer_of_base(&to) + TIMER_INTVAL_REG(1)); - writel(TIMER_CTL_ENABLE | TIMER_CTL_RELOAD | - TIMER_CTL_CLK_SRC(TIMER_CTL_CLK_SRC_OSC24M), - timer_of_base(&to) + TIMER_CTL_REG(1)); - - /* - * sched_clock_register does not have priorities, and on sun6i and - * later there is a better sched_clock registered by arm_arch_timer.c - */ - if (of_machine_is_compatible("allwinner,sun4i-a10") || - of_machine_is_compatible("allwinner,sun5i-a13") || - of_machine_is_compatible("allwinner,sun5i-a10s")) - sched_clock_register(sun4i_timer_sched_read, 32, - timer_of_rate(&to)); - - ret = clocksource_mmio_init(timer_of_base(&to) + TIMER_CNTVAL_REG(1), - node->name, timer_of_rate(&to), 350, 32, - clocksource_mmio_readl_down); - if (ret) { - pr_err("Failed to register clocksource\n"); - return ret; - } - - writel(TIMER_CTL_CLK_SRC(TIMER_CTL_CLK_SRC_OSC24M), - timer_of_base(&to) + TIMER_CTL_REG(0)); - - /* Make sure timer is stopped before playing with interrupts */ - sun4i_clkevt_time_stop(timer_of_base(&to), 0); - - /* clear timer0 interrupt */ - sun4i_timer_clear_interrupt(timer_of_base(&to)); - - clockevents_config_and_register(&to.clkevt, timer_of_rate(&to), - TIMER_SYNC_TICKS, 0xffffffff); - - /* Enable timer0 interrupt */ - val = readl(timer_of_base(&to) + TIMER_IRQ_EN_REG); - writel(val | TIMER_IRQ_EN(0), timer_of_base(&to) + TIMER_IRQ_EN_REG); - - return ret; -} -TIMER_OF_DECLARE(sun4i, "allwinner,sun4i-a10-timer", - sun4i_timer_init); |