diff options
25 files changed, 527 insertions, 486 deletions
diff --git a/Documentation/devicetree/bindings/timer/cadence,ttc-timer.txt b/Documentation/devicetree/bindings/timer/cadence,ttc-timer.txt new file mode 100644 index 000000000000..993695c659e1 --- /dev/null +++ b/Documentation/devicetree/bindings/timer/cadence,ttc-timer.txt @@ -0,0 +1,17 @@ +Cadence TTC - Triple Timer Counter + +Required properties: +- compatible : Should be "cdns,ttc". +- reg : Specifies base physical address and size of the registers. +- interrupts : A list of 3 interrupts; one per timer channel. +- clocks: phandle to the source clock + +Example: + +ttc0: ttc0@f8001000 { + interrupt-parent = <&intc>; + interrupts = < 0 10 4 0 11 4 0 12 4 >; + compatible = "cdns,ttc"; + reg = <0xF8001000 0x1000>; + clocks = <&cpu_clk 3>; +}; diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index c6a82c74fcbb..eb91022b90ba 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1598,6 +1598,7 @@ config HAVE_ARM_ARCH_TIMER config HAVE_ARM_TWD bool depends on SMP + select CLKSRC_OF if OF help This options enables support for the ARM timer and watchdog unit diff --git a/arch/arm/boot/dts/zynq-7000.dtsi b/arch/arm/boot/dts/zynq-7000.dtsi index 5914b5654591..51243db2e9e4 100644 --- a/arch/arm/boot/dts/zynq-7000.dtsi +++ b/arch/arm/boot/dts/zynq-7000.dtsi @@ -111,56 +111,23 @@ }; ttc0: ttc0@f8001000 { - #address-cells = <1>; - #size-cells = <0>; - compatible = "xlnx,ttc"; + interrupt-parent = <&intc>; + interrupts = < 0 10 4 0 11 4 0 12 4 >; + compatible = "cdns,ttc"; reg = <0xF8001000 0x1000>; clocks = <&cpu_clk 3>; clock-names = "cpu_1x"; clock-ranges; - - ttc0_0: ttc0.0 { - status = "disabled"; - reg = <0>; - interrupts = <0 10 4>; - }; - ttc0_1: ttc0.1 { - status = "disabled"; - reg = <1>; - interrupts = <0 11 4>; - }; - ttc0_2: ttc0.2 { - status = "disabled"; - reg = <2>; - interrupts = <0 12 4>; - }; }; ttc1: ttc1@f8002000 { - #interrupt-parent = <&intc>; - #address-cells = <1>; - #size-cells = <0>; - compatible = "xlnx,ttc"; + interrupt-parent = <&intc>; + interrupts = < 0 37 4 0 38 4 0 39 4 >; + compatible = "cdns,ttc"; reg = <0xF8002000 0x1000>; clocks = <&cpu_clk 3>; clock-names = "cpu_1x"; clock-ranges; - - ttc1_0: ttc1.0 { - status = "disabled"; - reg = <0>; - interrupts = <0 37 4>; - }; - ttc1_1: ttc1.1 { - status = "disabled"; - reg = <1>; - interrupts = <0 38 4>; - }; - ttc1_2: ttc1.2 { - status = "disabled"; - reg = <2>; - interrupts = <0 39 4>; - }; }; }; }; diff --git a/arch/arm/boot/dts/zynq-zc702.dts b/arch/arm/boot/dts/zynq-zc702.dts index c772942a399a..86f44d5b0265 100644 --- a/arch/arm/boot/dts/zynq-zc702.dts +++ b/arch/arm/boot/dts/zynq-zc702.dts @@ -32,13 +32,3 @@ &ps_clk { clock-frequency = <33333330>; }; - -&ttc0_0 { - status = "ok"; - compatible = "xlnx,ttc-counter-clocksource"; -}; - -&ttc0_1 { - status = "ok"; - compatible = "xlnx,ttc-counter-clockevent"; -}; diff --git a/arch/arm/include/asm/smp_twd.h b/arch/arm/include/asm/smp_twd.h index 0f01f4677bd2..7b2899c2f7fc 100644 --- a/arch/arm/include/asm/smp_twd.h +++ b/arch/arm/include/asm/smp_twd.h @@ -34,12 +34,4 @@ struct twd_local_timer name __initdata = { \ int twd_local_timer_register(struct twd_local_timer *); -#ifdef CONFIG_HAVE_ARM_TWD -void twd_local_timer_of_register(void); -#else -static inline void twd_local_timer_of_register(void) -{ -} -#endif - #endif diff --git a/arch/arm/kernel/smp_twd.c b/arch/arm/kernel/smp_twd.c index 3f2565037480..90525d9d290b 100644 --- a/arch/arm/kernel/smp_twd.c +++ b/arch/arm/kernel/smp_twd.c @@ -362,25 +362,13 @@ int __init twd_local_timer_register(struct twd_local_timer *tlt) } #ifdef CONFIG_OF -const static struct of_device_id twd_of_match[] __initconst = { - { .compatible = "arm,cortex-a9-twd-timer", }, - { .compatible = "arm,cortex-a5-twd-timer", }, - { .compatible = "arm,arm11mp-twd-timer", }, - { }, -}; - -void __init twd_local_timer_of_register(void) +static void __init twd_local_timer_of_register(struct device_node *np) { - struct device_node *np; int err; if (!is_smp() || !setup_max_cpus) return; - np = of_find_matching_node(NULL, twd_of_match); - if (!np) - return; - twd_ppi = irq_of_parse_and_map(np, 0); if (!twd_ppi) { err = -EINVAL; @@ -398,4 +386,7 @@ void __init twd_local_timer_of_register(void) out: WARN(err, "twd_local_timer_of_register failed (%d)\n", err); } +CLOCKSOURCE_OF_DECLARE(arm_twd_a9, "arm,cortex-a9-twd-timer", twd_local_timer_of_register); +CLOCKSOURCE_OF_DECLARE(arm_twd_a5, "arm,cortex-a5-twd-timer", twd_local_timer_of_register); +CLOCKSOURCE_OF_DECLARE(arm_twd_11mp, "arm,arm11mp-twd-timer", twd_local_timer_of_register); #endif diff --git a/arch/arm/mach-highbank/highbank.c b/arch/arm/mach-highbank/highbank.c index a4f9f50247d4..76c1170b3528 100644 --- a/arch/arm/mach-highbank/highbank.c +++ b/arch/arm/mach-highbank/highbank.c @@ -32,7 +32,6 @@ #include <asm/cacheflush.h> #include <asm/cputype.h> #include <asm/smp_plat.h> -#include <asm/smp_twd.h> #include <asm/hardware/arm_timer.h> #include <asm/hardware/timer-sp.h> #include <asm/hardware/cache-l2x0.h> @@ -119,10 +118,10 @@ static void __init highbank_timer_init(void) sp804_clocksource_and_sched_clock_init(timer_base + 0x20, "timer1"); sp804_clockevents_init(timer_base, irq, "timer0"); - twd_local_timer_of_register(); - arch_timer_of_register(); arch_timer_sched_clock_init(); + + clocksource_of_init(); } static void highbank_power_off(void) diff --git a/arch/arm/mach-imx/mach-imx6q.c b/arch/arm/mach-imx/mach-imx6q.c index 9ffd103b27e4..b59ddcb57c78 100644 --- a/arch/arm/mach-imx/mach-imx6q.c +++ b/arch/arm/mach-imx/mach-imx6q.c @@ -12,6 +12,7 @@ #include <linux/clk.h> #include <linux/clkdev.h> +#include <linux/clocksource.h> #include <linux/cpu.h> #include <linux/delay.h> #include <linux/export.h> @@ -28,11 +29,9 @@ #include <linux/regmap.h> #include <linux/micrel_phy.h> #include <linux/mfd/syscon.h> -#include <asm/smp_twd.h> #include <asm/hardware/cache-l2x0.h> #include <asm/mach/arch.h> #include <asm/mach/map.h> -#include <asm/mach/time.h> #include <asm/system_misc.h> #include "common.h" @@ -292,7 +291,7 @@ static void __init imx6q_init_irq(void) static void __init imx6q_timer_init(void) { mx6q_clocks_init(); - twd_local_timer_of_register(); + clocksource_of_init(); imx_print_silicon_rev("i.MX6Q", imx6q_revision()); } diff --git a/arch/arm/mach-omap2/timer.c b/arch/arm/mach-omap2/timer.c index 2bdd4cf17a8f..4fd80257c73e 100644 --- a/arch/arm/mach-omap2/timer.c +++ b/arch/arm/mach-omap2/timer.c @@ -597,7 +597,7 @@ void __init omap4_local_timer_init(void) int err; if (of_have_populated_dt()) { - twd_local_timer_of_register(); + clocksource_of_init(); return; } diff --git a/arch/arm/mach-spear13xx/spear13xx.c b/arch/arm/mach-spear13xx/spear13xx.c index c7d2b4a8d8cc..25a10191b021 100644 --- a/arch/arm/mach-spear13xx/spear13xx.c +++ b/arch/arm/mach-spear13xx/spear13xx.c @@ -15,12 +15,12 @@ #include <linux/amba/pl022.h> #include <linux/clk.h> +#include <linux/clocksource.h> #include <linux/dw_dmac.h> #include <linux/err.h> #include <linux/of.h> #include <asm/hardware/cache-l2x0.h> #include <asm/mach/map.h> -#include <asm/smp_twd.h> #include <mach/dma.h> #include <mach/generic.h> #include <mach/spear.h> @@ -179,5 +179,5 @@ void __init spear13xx_timer_init(void) clk_put(pclk); spear_setup_of_timer(); - twd_local_timer_of_register(); + clocksource_of_init(); } diff --git a/arch/arm/mach-ux500/timer.c b/arch/arm/mach-ux500/timer.c index a6af0b8732ba..d07bbe7f04a6 100644 --- a/arch/arm/mach-ux500/timer.c +++ b/arch/arm/mach-ux500/timer.c @@ -7,6 +7,7 @@ #include <linux/io.h> #include <linux/errno.h> #include <linux/clksrc-dbx500-prcmu.h> +#include <linux/clocksource.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/platform_data/clocksource-nomadik-mtu.h> @@ -32,7 +33,7 @@ static void __init ux500_twd_init(void) twd_local_timer = &u8500_twd_local_timer; if (of_have_populated_dt()) - twd_local_timer_of_register(); + clocksource_of_init(); else { err = twd_local_timer_register(twd_local_timer); if (err) diff --git a/arch/arm/mach-vexpress/v2m.c b/arch/arm/mach-vexpress/v2m.c index 915683cb67d6..d0ad78998cb6 100644 --- a/arch/arm/mach-vexpress/v2m.c +++ b/arch/arm/mach-vexpress/v2m.c @@ -5,6 +5,7 @@ #include <linux/amba/bus.h> #include <linux/amba/mmci.h> #include <linux/io.h> +#include <linux/clocksource.h> #include <linux/smp.h> #include <linux/init.h> #include <linux/irqchip.h> @@ -25,7 +26,6 @@ #include <asm/arch_timer.h> #include <asm/mach-types.h> #include <asm/sizes.h> -#include <asm/smp_twd.h> #include <asm/mach/arch.h> #include <asm/mach/map.h> #include <asm/mach/time.h> @@ -435,6 +435,7 @@ static void __init v2m_dt_timer_init(void) vexpress_clk_of_init(); + clocksource_of_init(); do { node = of_find_compatible_node(node, NULL, "arm,sp804"); } while (node && vexpress_get_site_by_node(node) != VEXPRESS_SITE_MB); @@ -445,8 +446,7 @@ static void __init v2m_dt_timer_init(void) irq_of_parse_and_map(node, 0)); } - if (arch_timer_of_register() != 0) - twd_local_timer_of_register(); + arch_timer_of_register(); if (arch_timer_sched_clock_init() != 0) versatile_sched_clock_init(vexpress_get_24mhz_clock_base(), diff --git a/arch/arm/mach-zynq/Kconfig b/arch/arm/mach-zynq/Kconfig index adb6c0ea0e53..d70651e8b705 100644 --- a/arch/arm/mach-zynq/Kconfig +++ b/arch/arm/mach-zynq/Kconfig @@ -9,5 +9,6 @@ config ARCH_ZYNQ select MIGHT_HAVE_CACHE_L2X0 select USE_OF select SPARSE_IRQ + select CADENCE_TTC_TIMER help Support for Xilinx Zynq ARM Cortex A9 Platform diff --git a/arch/arm/mach-zynq/Makefile b/arch/arm/mach-zynq/Makefile index 397268c1b250..320faedeb484 100644 --- a/arch/arm/mach-zynq/Makefile +++ b/arch/arm/mach-zynq/Makefile @@ -3,4 +3,4 @@ # # Common support -obj-y := common.o timer.o +obj-y := common.o diff --git a/arch/arm/mach-zynq/common.c b/arch/arm/mach-zynq/common.c index 5c8983218183..68e0907de5d0 100644 --- a/arch/arm/mach-zynq/common.c +++ b/arch/arm/mach-zynq/common.c @@ -20,6 +20,7 @@ #include <linux/platform_device.h> #include <linux/clk.h> #include <linux/clk/zynq.h> +#include <linux/clocksource.h> #include <linux/of_address.h> #include <linux/of_irq.h> #include <linux/of_platform.h> @@ -77,7 +78,7 @@ static void __init xilinx_zynq_timer_init(void) xilinx_zynq_clocks_init(slcr); - xttcps_timer_init(); + clocksource_of_init(); } /** diff --git a/arch/arm/mach-zynq/common.h b/arch/arm/mach-zynq/common.h index 8b4dbbaa01cf..5050bb10bb12 100644 --- a/arch/arm/mach-zynq/common.h +++ b/arch/arm/mach-zynq/common.h @@ -17,6 +17,4 @@ #ifndef __MACH_ZYNQ_COMMON_H__ #define __MACH_ZYNQ_COMMON_H__ -void __init xttcps_timer_init(void); - #endif diff --git a/arch/arm/mach-zynq/timer.c b/arch/arm/mach-zynq/timer.c deleted file mode 100644 index f9fbc9c1e7a6..000000000000 --- a/arch/arm/mach-zynq/timer.c +++ /dev/null @@ -1,324 +0,0 @@ -/* - * This file contains driver for the Xilinx PS Timer Counter IP. - * - * Copyright (C) 2011 Xilinx - * - * based on arch/mips/kernel/time.c timer driver - * - * This software is licensed under the terms of the GNU General Public - * License version 2, as published by the Free Software Foundation, and - * may be copied, distributed, and modified under those terms. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - */ - -#include <linux/interrupt.h> -#include <linux/clockchips.h> -#include <linux/of_address.h> -#include <linux/of_irq.h> -#include <linux/slab.h> -#include <linux/clk-provider.h> -#include "common.h" - -/* - * Timer Register Offset Definitions of Timer 1, Increment base address by 4 - * and use same offsets for Timer 2 - */ -#define XTTCPS_CLK_CNTRL_OFFSET 0x00 /* Clock Control Reg, RW */ -#define XTTCPS_CNT_CNTRL_OFFSET 0x0C /* Counter Control Reg, RW */ -#define XTTCPS_COUNT_VAL_OFFSET 0x18 /* Counter Value Reg, RO */ -#define XTTCPS_INTR_VAL_OFFSET 0x24 /* Interval Count Reg, RW */ -#define XTTCPS_ISR_OFFSET 0x54 /* Interrupt Status Reg, RO */ -#define XTTCPS_IER_OFFSET 0x60 /* Interrupt Enable Reg, RW */ - -#define XTTCPS_CNT_CNTRL_DISABLE_MASK 0x1 - -/* - * Setup the timers to use pre-scaling, using a fixed value for now that will - * work across most input frequency, but it may need to be more dynamic - */ -#define PRESCALE_EXPONENT 11 /* 2 ^ PRESCALE_EXPONENT = PRESCALE */ -#define PRESCALE 2048 /* The exponent must match this */ -#define CLK_CNTRL_PRESCALE ((PRESCALE_EXPONENT - 1) << 1) -#define CLK_CNTRL_PRESCALE_EN 1 -#define CNT_CNTRL_RESET (1<<4) - -/** - * struct xttcps_timer - This definition defines local timer structure - * - * @base_addr: Base address of timer - **/ -struct xttcps_timer { - void __iomem *base_addr; -}; - -struct xttcps_timer_clocksource { - struct xttcps_timer xttc; - struct clocksource cs; -}; - -#define to_xttcps_timer_clksrc(x) \ - container_of(x, struct xttcps_timer_clocksource, cs) - -struct xttcps_timer_clockevent { - struct xttcps_timer xttc; - struct clock_event_device ce; - struct clk *clk; -}; - -#define to_xttcps_timer_clkevent(x) \ - container_of(x, struct xttcps_timer_clockevent, ce) - -/** - * xttcps_set_interval - Set the timer interval value - * - * @timer: Pointer to the timer instance - * @cycles: Timer interval ticks - **/ -static void xttcps_set_interval(struct xttcps_timer *timer, - unsigned long cycles) -{ - u32 ctrl_reg; - - /* Disable the counter, set the counter value and re-enable counter */ - ctrl_reg = __raw_readl(timer->base_addr + XTTCPS_CNT_CNTRL_OFFSET); - ctrl_reg |= XTTCPS_CNT_CNTRL_DISABLE_MASK; - __raw_writel(ctrl_reg, timer->base_addr + XTTCPS_CNT_CNTRL_OFFSET); - - __raw_writel(cycles, timer->base_addr + XTTCPS_INTR_VAL_OFFSET); - - /* - * Reset the counter (0x10) so that it starts from 0, one-shot - * mode makes this needed for timing to be right. - */ - ctrl_reg |= CNT_CNTRL_RESET; - ctrl_reg &= ~XTTCPS_CNT_CNTRL_DISABLE_MASK; - __raw_writel(ctrl_reg, timer->base_addr + XTTCPS_CNT_CNTRL_OFFSET); -} - -/** - * xttcps_clock_event_interrupt - Clock event timer interrupt handler - * - * @irq: IRQ number of the Timer - * @dev_id: void pointer to the xttcps_timer instance - * - * returns: Always IRQ_HANDLED - success - **/ -static irqreturn_t xttcps_clock_event_interrupt(int irq, void *dev_id) -{ - struct xttcps_timer_clockevent *xttce = dev_id; - struct xttcps_timer *timer = &xttce->xttc; - - /* Acknowledge the interrupt and call event handler */ - __raw_readl(timer->base_addr + XTTCPS_ISR_OFFSET); - - xttce->ce.event_handler(&xttce->ce); - - return IRQ_HANDLED; -} - -/** - * __xttc_clocksource_read - Reads the timer counter register - * - * returns: Current timer counter register value - **/ -static cycle_t __xttc_clocksource_read(struct clocksource *cs) -{ - struct xttcps_timer *timer = &to_xttcps_timer_clksrc(cs)->xttc; - - return (cycle_t)__raw_readl(timer->base_addr + - XTTCPS_COUNT_VAL_OFFSET); -} - -/** - * xttcps_set_next_event - Sets the time interval for next event - * - * @cycles: Timer interval ticks - * @evt: Address of clock event instance - * - * returns: Always 0 - success - **/ -static int xttcps_set_next_event(unsigned long cycles, - struct clock_event_device *evt) -{ - struct xttcps_timer_clockevent *xttce = to_xttcps_timer_clkevent(evt); - struct xttcps_timer *timer = &xttce->xttc; - - xttcps_set_interval(timer, cycles); - return 0; -} - -/** - * xttcps_set_mode - Sets the mode of timer - * - * @mode: Mode to be set - * @evt: Address of clock event instance - **/ -static void xttcps_set_mode(enum clock_event_mode mode, - struct clock_event_device *evt) -{ - struct xttcps_timer_clockevent *xttce = to_xttcps_timer_clkevent(evt); - struct xttcps_timer *timer = &xttce->xttc; - u32 ctrl_reg; - - switch (mode) { - case CLOCK_EVT_MODE_PERIODIC: - xttcps_set_interval(timer, - DIV_ROUND_CLOSEST(clk_get_rate(xttce->clk), - PRESCALE * HZ)); - break; - case CLOCK_EVT_MODE_ONESHOT: - case CLOCK_EVT_MODE_UNUSED: - case CLOCK_EVT_MODE_SHUTDOWN: - ctrl_reg = __raw_readl(timer->base_addr + - XTTCPS_CNT_CNTRL_OFFSET); - ctrl_reg |= XTTCPS_CNT_CNTRL_DISABLE_MASK; - __raw_writel(ctrl_reg, - timer->base_addr + XTTCPS_CNT_CNTRL_OFFSET); - break; - case CLOCK_EVT_MODE_RESUME: - ctrl_reg = __raw_readl(timer->base_addr + - XTTCPS_CNT_CNTRL_OFFSET); - ctrl_reg &= ~XTTCPS_CNT_CNTRL_DISABLE_MASK; - __raw_writel(ctrl_reg, - timer->base_addr + XTTCPS_CNT_CNTRL_OFFSET); - break; - } -} - -static void __init zynq_ttc_setup_clocksource(struct device_node *np, - void __iomem *base) -{ - struct xttcps_timer_clocksource *ttccs; - struct clk *clk; - int err; - u32 reg; - - ttccs = kzalloc(sizeof(*ttccs), GFP_KERNEL); - if (WARN_ON(!ttccs)) - return; - - err = of_property_read_u32(np, "reg", ®); - if (WARN_ON(err)) - return; - - clk = of_clk_get_by_name(np, "cpu_1x"); - if (WARN_ON(IS_ERR(clk))) - return; - - err = clk_prepare_enable(clk); - if (WARN_ON(err)) - return; - - ttccs->xttc.base_addr = base + reg * 4; - - ttccs->cs.name = np->name; - ttccs->cs.rating = 200; - ttccs->cs.read = __xttc_clocksource_read; - ttccs->cs.mask = CLOCKSOURCE_MASK(16); - ttccs->cs.flags = CLOCK_SOURCE_IS_CONTINUOUS; - - __raw_writel(0x0, ttccs->xttc.base_addr + XTTCPS_IER_OFFSET); - __raw_writel(CLK_CNTRL_PRESCALE | CLK_CNTRL_PRESCALE_EN, - ttccs->xttc.base_addr + XTTCPS_CLK_CNTRL_OFFSET); - __raw_writel(CNT_CNTRL_RESET, - ttccs->xttc.base_addr + XTTCPS_CNT_CNTRL_OFFSET); - - err = clocksource_register_hz(&ttccs->cs, clk_get_rate(clk) / PRESCALE); - if (WARN_ON(err)) - return; -} - -static void __init zynq_ttc_setup_clockevent(struct device_node *np, - void __iomem *base) -{ - struct xttcps_timer_clockevent *ttcce; - int err, irq; - u32 reg; - - ttcce = kzalloc(sizeof(*ttcce), GFP_KERNEL); - if (WARN_ON(!ttcce)) - return; - - err = of_property_read_u32(np, "reg", ®); - if (WARN_ON(err)) - return; - - ttcce->xttc.base_addr = base + reg * 4; - - ttcce->clk = of_clk_get_by_name(np, "cpu_1x"); - if (WARN_ON(IS_ERR(ttcce->clk))) - return; - - err = clk_prepare_enable(ttcce->clk); - if (WARN_ON(err)) - return; - - irq = irq_of_parse_and_map(np, 0); - if (WARN_ON(!irq)) - return; - - ttcce->ce.name = np->name; - ttcce->ce.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT; - ttcce->ce.set_next_event = xttcps_set_next_event; - ttcce->ce.set_mode = xttcps_set_mode; - ttcce->ce.rating = 200; - ttcce->ce.irq = irq; - ttcce->ce.cpumask = cpu_possible_mask; - - __raw_writel(0x23, ttcce->xttc.base_addr + XTTCPS_CNT_CNTRL_OFFSET); - __raw_writel(CLK_CNTRL_PRESCALE | CLK_CNTRL_PRESCALE_EN, - ttcce->xttc.base_addr + XTTCPS_CLK_CNTRL_OFFSET); - __raw_writel(0x1, ttcce->xttc.base_addr + XTTCPS_IER_OFFSET); - - err = request_irq(irq, xttcps_clock_event_interrupt, IRQF_TIMER, - np->name, ttcce); - if (WARN_ON(err)) - return; - - clockevents_config_and_register(&ttcce->ce, - clk_get_rate(ttcce->clk) / PRESCALE, - 1, 0xfffe); -} - -static const __initconst struct of_device_id zynq_ttc_match[] = { - { .compatible = "xlnx,ttc-counter-clocksource", - .data = zynq_ttc_setup_clocksource, }, - { .compatible = "xlnx,ttc-counter-clockevent", - .data = zynq_ttc_setup_clockevent, }, - {} -}; - -/** - * xttcps_timer_init - Initialize the timer - * - * Initializes the timer hardware and register the clock source and clock event - * timers with Linux kernal timer framework - **/ -void __init xttcps_timer_init(void) -{ - struct device_node *np; - - for_each_compatible_node(np, NULL, "xlnx,ttc") { - struct device_node *np_chld; - void __iomem *base; - - base = of_iomap(np, 0); - if (WARN_ON(!base)) - return; - - for_each_available_child_of_node(np, np_chld) { - int (*cb)(struct device_node *np, void __iomem *base); - const struct of_device_id *match; - - match = of_match_node(zynq_ttc_match, np_chld); - if (match) { - cb = match->data; - cb(np_chld, base); - } - } - } -} diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig index e507ab7df60b..3167fda9bbb3 100644 --- a/drivers/clocksource/Kconfig +++ b/drivers/clocksource/Kconfig @@ -31,6 +31,9 @@ config SUNXI_TIMER config VT8500_TIMER bool +config CADENCE_TTC_TIMER + bool + config CLKSRC_NOMADIK_MTU bool depends on (ARCH_NOMADIK || ARCH_U8500) diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile index 4d8283aec5b5..e74c8ce26bf0 100644 --- a/drivers/clocksource/Makefile +++ b/drivers/clocksource/Makefile @@ -19,6 +19,7 @@ obj-$(CONFIG_ARCH_BCM2835) += bcm2835_timer.o obj-$(CONFIG_SUNXI_TIMER) += sunxi_timer.o obj-$(CONFIG_ARCH_TEGRA) += tegra20_timer.o obj-$(CONFIG_VT8500_TIMER) += vt8500_timer.o +obj-$(CONFIG_CADENCE_TTC_TIMER) += cadence_ttc_timer.o obj-$(CONFIG_ARM_ARCH_TIMER) += arm_arch_timer.o obj-$(CONFIG_CLKSRC_METAG_GENERIC) += metag_generic.o diff --git a/drivers/clocksource/bcm2835_timer.c b/drivers/clocksource/bcm2835_timer.c index 50c68fef944b..766611d29945 100644 --- a/drivers/clocksource/bcm2835_timer.c +++ b/drivers/clocksource/bcm2835_timer.c @@ -95,23 +95,13 @@ static irqreturn_t bcm2835_time_interrupt(int irq, void *dev_id) } } -static struct of_device_id bcm2835_time_match[] __initconst = { - { .compatible = "brcm,bcm2835-system-timer" }, - {} -}; - -static void __init bcm2835_timer_init(void) +static void __init bcm2835_timer_init(struct device_node *node) { - struct device_node *node; void __iomem *base; u32 freq; int irq; struct bcm2835_timer *timer; - node = of_find_matching_node(NULL, bcm2835_time_match); - if (!node) - panic("No bcm2835 timer node"); - base = of_iomap(node, 0); if (!base) panic("Can't remap registers"); diff --git a/drivers/clocksource/cadence_ttc_timer.c b/drivers/clocksource/cadence_ttc_timer.c new file mode 100644 index 000000000000..685bc60e210a --- /dev/null +++ b/drivers/clocksource/cadence_ttc_timer.c @@ -0,0 +1,436 @@ +/* + * This file contains driver for the Cadence Triple Timer Counter Rev 06 + * + * Copyright (C) 2011-2013 Xilinx + * + * based on arch/mips/kernel/time.c timer driver + * + * This software is licensed under the terms of the GNU General Public + * License version 2, as published by the Free Software Foundation, and + * may be copied, distributed, and modified under those terms. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/clk.h> +#include <linux/interrupt.h> +#include <linux/clockchips.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/slab.h> +#include <linux/clk-provider.h> + +/* + * This driver configures the 2 16-bit count-up timers as follows: + * + * T1: Timer 1, clocksource for generic timekeeping + * T2: Timer 2, clockevent source for hrtimers + * T3: Timer 3, <unused> + * + * The input frequency to the timer module for emulation is 2.5MHz which is + * common to all the timer channels (T1, T2, and T3). With a pre-scaler of 32, + * the timers are clocked at 78.125KHz (12.8 us resolution). + + * The input frequency to the timer module in silicon is configurable and + * obtained from device tree. The pre-scaler of 32 is used. + */ + +/* + * Timer Register Offset Definitions of Timer 1, Increment base address by 4 + * and use same offsets for Timer 2 + */ +#define TTC_CLK_CNTRL_OFFSET 0x00 /* Clock Control Reg, RW */ +#define TTC_CNT_CNTRL_OFFSET 0x0C /* Counter Control Reg, RW */ +#define TTC_COUNT_VAL_OFFSET 0x18 /* Counter Value Reg, RO */ +#define TTC_INTR_VAL_OFFSET 0x24 /* Interval Count Reg, RW */ +#define TTC_ISR_OFFSET 0x54 /* Interrupt Status Reg, RO */ +#define TTC_IER_OFFSET 0x60 /* Interrupt Enable Reg, RW */ + +#define TTC_CNT_CNTRL_DISABLE_MASK 0x1 + +/* + * Setup the timers to use pre-scaling, using a fixed value for now that will + * work across most input frequency, but it may need to be more dynamic + */ +#define PRESCALE_EXPONENT 11 /* 2 ^ PRESCALE_EXPONENT = PRESCALE */ +#define PRESCALE 2048 /* The exponent must match this */ +#define CLK_CNTRL_PRESCALE ((PRESCALE_EXPONENT - 1) << 1) +#define CLK_CNTRL_PRESCALE_EN 1 +#define CNT_CNTRL_RESET (1 << 4) + +/** + * struct ttc_timer - This definition defines local timer structure + * + * @base_addr: Base address of timer + * @clk: Associated clock source + * @clk_rate_change_nb Notifier block for clock rate changes + */ +struct ttc_timer { + void __iomem *base_addr; + struct clk *clk; + struct notifier_block clk_rate_change_nb; +}; + +#define to_ttc_timer(x) \ + container_of(x, struct ttc_timer, clk_rate_change_nb) + +struct ttc_timer_clocksource { + struct ttc_timer ttc; + struct clocksource cs; +}; + +#define to_ttc_timer_clksrc(x) \ + container_of(x, struct ttc_timer_clocksource, cs) + +struct ttc_timer_clockevent { + struct ttc_timer ttc; + struct clock_event_device ce; +}; + +#define to_ttc_timer_clkevent(x) \ + container_of(x, struct ttc_timer_clockevent, ce) + +/** + * ttc_set_interval - Set the timer interval value + * + * @timer: Pointer to the timer instance + * @cycles: Timer interval ticks + **/ +static void ttc_set_interval(struct ttc_timer *timer, + unsigned long cycles) +{ + u32 ctrl_reg; + + /* Disable the counter, set the counter value and re-enable counter */ + ctrl_reg = __raw_readl(timer->base_addr + TTC_CNT_CNTRL_OFFSET); + ctrl_reg |= TTC_CNT_CNTRL_DISABLE_MASK; + __raw_writel(ctrl_reg, timer->base_addr + TTC_CNT_CNTRL_OFFSET); + + __raw_writel(cycles, timer->base_addr + TTC_INTR_VAL_OFFSET); + + /* + * Reset the counter (0x10) so that it starts from 0, one-shot + * mode makes this needed for timing to be right. + */ + ctrl_reg |= CNT_CNTRL_RESET; + ctrl_reg &= ~TTC_CNT_CNTRL_DISABLE_MASK; + __raw_writel(ctrl_reg, timer->base_addr + TTC_CNT_CNTRL_OFFSET); +} + +/** + * ttc_clock_event_interrupt - Clock event timer interrupt handler + * + * @irq: IRQ number of the Timer + * @dev_id: void pointer to the ttc_timer instance + * + * returns: Always IRQ_HANDLED - success + **/ +static irqreturn_t ttc_clock_event_interrupt(int irq, void *dev_id) +{ + struct ttc_timer_clockevent *ttce = dev_id; + struct ttc_timer *timer = &ttce->ttc; + + /* Acknowledge the interrupt and call event handler */ + __raw_readl(timer->base_addr + TTC_ISR_OFFSET); + + ttce->ce.event_handler(&ttce->ce); + + return IRQ_HANDLED; +} + +/** |