ARM: EXYNOS4: Implement kernel timers using MCT
The Multi-Core Timer(MCT) of EXYNOS4 is designed for implementing clock source timer and clock event timers. This patch implements 1 clock source timer with 64 bit free running counter of MCT and 2 clock event timers with two of 31-bit tick counters. Signed-off-by: Changhwan Youn <chaos.youn@samsung.com> Cc: Ben Dooks <ben-linux@fluff.org> Cc: Russell King <rmk+kernel@arm.linux.org.uk> Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
This commit is contained in:
Changhwan Youn
Kukjin Kim
parent
614a392e1c
commit
30d8bead5a
5 changed files with 487 additions and 2 deletions
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@ -1366,7 +1366,7 @@ config LOCAL_TIMERS
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bool "Use local timer interrupts"
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depends on SMP
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default y
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select HAVE_ARM_TWD if !ARCH_MSM_SCORPIONMP
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select HAVE_ARM_TWD if (!ARCH_MSM_SCORPIONMP && !EXYNOS4_MCT)
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help
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Enable support for local timers on SMP platforms, rather then the
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legacy IPI broadcast method. Local timers allows the system
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@ -15,6 +15,11 @@ config CPU_EXYNOS4210
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help
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Enable EXYNOS4210 CPU support
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config EXYNOS4_MCT
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bool "Kernel timer support by MCT"
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help
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Use MCT (Multi Core Timer) as kernel timers
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config EXYNOS4_DEV_PD
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bool
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help
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@ -13,11 +13,18 @@ obj- :=
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# Core support for EXYNOS4 system
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obj-$(CONFIG_CPU_EXYNOS4210) += cpu.o init.o clock.o irq-combiner.o
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obj-$(CONFIG_CPU_EXYNOS4210) += setup-i2c0.o time.o gpiolib.o irq-eint.o dma.o
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obj-$(CONFIG_CPU_EXYNOS4210) += setup-i2c0.o gpiolib.o irq-eint.o dma.o
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obj-$(CONFIG_CPU_FREQ) += cpufreq.o
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obj-$(CONFIG_SMP) += platsmp.o headsmp.o
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ifeq ($(CONFIG_EXYNOS4_MCT),y)
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obj-y += mct.o
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else
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obj-y += time.o
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obj-$(CONFIG_LOCAL_TIMERS) += localtimer.o
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endif
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obj-$(CONFIG_HOTPLUG_CPU) += hotplug.o
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# machine support
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52
arch/arm/mach-exynos4/include/mach/regs-mct.h
Normal file
52
arch/arm/mach-exynos4/include/mach/regs-mct.h
Normal file
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@ -0,0 +1,52 @@
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/* arch/arm/mach-exynos4/include/mach/regs-mct.h
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*
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* Copyright (c) 2011 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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*
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* EXYNOS4 MCT configutation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __ASM_ARCH_REGS_MCT_H
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#define __ASM_ARCH_REGS_MCT_H __FILE__
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#include <mach/map.h>
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#define EXYNOS4_MCTREG(x) (S5P_VA_SYSTIMER + (x))
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#define EXYNOS4_MCT_G_CNT_L EXYNOS4_MCTREG(0x100)
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#define EXYNOS4_MCT_G_CNT_U EXYNOS4_MCTREG(0x104)
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#define EXYNOS4_MCT_G_CNT_WSTAT EXYNOS4_MCTREG(0x110)
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#define EXYNOS4_MCT_G_COMP0_L EXYNOS4_MCTREG(0x200)
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#define EXYNOS4_MCT_G_COMP0_U EXYNOS4_MCTREG(0x204)
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#define EXYNOS4_MCT_G_COMP0_ADD_INCR EXYNOS4_MCTREG(0x208)
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#define EXYNOS4_MCT_G_TCON EXYNOS4_MCTREG(0x240)
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#define EXYNOS4_MCT_G_INT_CSTAT EXYNOS4_MCTREG(0x244)
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#define EXYNOS4_MCT_G_INT_ENB EXYNOS4_MCTREG(0x248)
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#define EXYNOS4_MCT_G_WSTAT EXYNOS4_MCTREG(0x24C)
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#define EXYNOS4_MCT_L0_BASE EXYNOS4_MCTREG(0x300)
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#define EXYNOS4_MCT_L1_BASE EXYNOS4_MCTREG(0x400)
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#define MCT_L_TCNTB_OFFSET (0x00)
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#define MCT_L_ICNTB_OFFSET (0x08)
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#define MCT_L_TCON_OFFSET (0x20)
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#define MCT_L_INT_CSTAT_OFFSET (0x30)
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#define MCT_L_INT_ENB_OFFSET (0x34)
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#define MCT_L_WSTAT_OFFSET (0x40)
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#define MCT_G_TCON_START (1 << 8)
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#define MCT_G_TCON_COMP0_AUTO_INC (1 << 1)
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#define MCT_G_TCON_COMP0_ENABLE (1 << 0)
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#define MCT_L_TCON_INTERVAL_MODE (1 << 2)
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#define MCT_L_TCON_INT_START (1 << 1)
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#define MCT_L_TCON_TIMER_START (1 << 0)
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#endif /* __ASM_ARCH_REGS_MCT_H */
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421
arch/arm/mach-exynos4/mct.c
Normal file
421
arch/arm/mach-exynos4/mct.c
Normal file
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@ -0,0 +1,421 @@
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/* linux/arch/arm/mach-exynos4/mct.c
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*
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* Copyright (c) 2011 Samsung Electronics Co., Ltd.
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* http://www.samsung.com
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*
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* EXYNOS4 MCT(Multi-Core Timer) support
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/sched.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/err.h>
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#include <linux/clk.h>
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#include <linux/clockchips.h>
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#include <linux/platform_device.h>
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#include <linux/delay.h>
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#include <linux/percpu.h>
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#include <mach/map.h>
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#include <mach/regs-mct.h>
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#include <asm/mach/time.h>
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static unsigned long clk_cnt_per_tick;
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static unsigned long clk_rate;
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struct mct_clock_event_device {
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struct clock_event_device *evt;
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void __iomem *base;
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};
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struct mct_clock_event_device mct_tick[2];
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static void exynos4_mct_write(unsigned int value, void *addr)
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{
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void __iomem *stat_addr;
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u32 mask;
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u32 i;
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__raw_writel(value, addr);
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switch ((u32) addr) {
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case (u32) EXYNOS4_MCT_G_TCON:
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stat_addr = EXYNOS4_MCT_G_WSTAT;
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mask = 1 << 16; /* G_TCON write status */
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break;
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case (u32) EXYNOS4_MCT_G_COMP0_L:
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stat_addr = EXYNOS4_MCT_G_WSTAT;
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mask = 1 << 0; /* G_COMP0_L write status */
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break;
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case (u32) EXYNOS4_MCT_G_COMP0_U:
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stat_addr = EXYNOS4_MCT_G_WSTAT;
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mask = 1 << 1; /* G_COMP0_U write status */
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break;
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case (u32) EXYNOS4_MCT_G_COMP0_ADD_INCR:
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stat_addr = EXYNOS4_MCT_G_WSTAT;
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mask = 1 << 2; /* G_COMP0_ADD_INCR write status */
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break;
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case (u32) EXYNOS4_MCT_G_CNT_L:
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stat_addr = EXYNOS4_MCT_G_CNT_WSTAT;
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mask = 1 << 0; /* G_CNT_L write status */
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break;
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case (u32) EXYNOS4_MCT_G_CNT_U:
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stat_addr = EXYNOS4_MCT_G_CNT_WSTAT;
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mask = 1 << 1; /* G_CNT_U write status */
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break;
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case (u32)(EXYNOS4_MCT_L0_BASE + MCT_L_TCON_OFFSET):
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stat_addr = EXYNOS4_MCT_L0_BASE + MCT_L_WSTAT_OFFSET;
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mask = 1 << 3; /* L0_TCON write status */
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break;
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case (u32)(EXYNOS4_MCT_L1_BASE + MCT_L_TCON_OFFSET):
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stat_addr = EXYNOS4_MCT_L1_BASE + MCT_L_WSTAT_OFFSET;
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mask = 1 << 3; /* L1_TCON write status */
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break;
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case (u32)(EXYNOS4_MCT_L0_BASE + MCT_L_TCNTB_OFFSET):
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stat_addr = EXYNOS4_MCT_L0_BASE + MCT_L_WSTAT_OFFSET;
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mask = 1 << 0; /* L0_TCNTB write status */
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break;
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case (u32)(EXYNOS4_MCT_L1_BASE + MCT_L_TCNTB_OFFSET):
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stat_addr = EXYNOS4_MCT_L1_BASE + MCT_L_WSTAT_OFFSET;
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mask = 1 << 0; /* L1_TCNTB write status */
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break;
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case (u32)(EXYNOS4_MCT_L0_BASE + MCT_L_ICNTB_OFFSET):
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stat_addr = EXYNOS4_MCT_L0_BASE + MCT_L_WSTAT_OFFSET;
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mask = 1 << 1; /* L0_ICNTB write status */
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break;
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case (u32)(EXYNOS4_MCT_L1_BASE + MCT_L_ICNTB_OFFSET):
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stat_addr = EXYNOS4_MCT_L1_BASE + MCT_L_WSTAT_OFFSET;
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mask = 1 << 1; /* L1_ICNTB write status */
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break;
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default:
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return;
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}
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/* Wait maximum 1 ms until written values are applied */
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for (i = 0; i < loops_per_jiffy / 1000 * HZ; i++)
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if (__raw_readl(stat_addr) & mask) {
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__raw_writel(mask, stat_addr);
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return;
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}
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panic("MCT hangs after writing %d (addr:0x%08x)\n", value, (u32)addr);
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}
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/* Clocksource handling */
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static void exynos4_mct_frc_start(u32 hi, u32 lo)
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{
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u32 reg;
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exynos4_mct_write(lo, EXYNOS4_MCT_G_CNT_L);
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exynos4_mct_write(hi, EXYNOS4_MCT_G_CNT_U);
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reg = __raw_readl(EXYNOS4_MCT_G_TCON);
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reg |= MCT_G_TCON_START;
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exynos4_mct_write(reg, EXYNOS4_MCT_G_TCON);
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}
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static cycle_t exynos4_frc_read(struct clocksource *cs)
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{
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unsigned int lo, hi;
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u32 hi2 = __raw_readl(EXYNOS4_MCT_G_CNT_U);
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do {
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hi = hi2;
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lo = __raw_readl(EXYNOS4_MCT_G_CNT_L);
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hi2 = __raw_readl(EXYNOS4_MCT_G_CNT_U);
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} while (hi != hi2);
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return ((cycle_t)hi << 32) | lo;
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}
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struct clocksource mct_frc = {
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.name = "mct-frc",
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.rating = 400,
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.read = exynos4_frc_read,
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.mask = CLOCKSOURCE_MASK(64),
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.flags = CLOCK_SOURCE_IS_CONTINUOUS,
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};
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static void __init exynos4_clocksource_init(void)
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{
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exynos4_mct_frc_start(0, 0);
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if (clocksource_register_hz(&mct_frc, clk_rate))
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panic("%s: can't register clocksource\n", mct_frc.name);
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}
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static void exynos4_mct_comp0_stop(void)
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{
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unsigned int tcon;
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tcon = __raw_readl(EXYNOS4_MCT_G_TCON);
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tcon &= ~(MCT_G_TCON_COMP0_ENABLE | MCT_G_TCON_COMP0_AUTO_INC);
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exynos4_mct_write(tcon, EXYNOS4_MCT_G_TCON);
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exynos4_mct_write(0, EXYNOS4_MCT_G_INT_ENB);
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}
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static void exynos4_mct_comp0_start(enum clock_event_mode mode,
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unsigned long cycles)
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{
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unsigned int tcon;
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cycle_t comp_cycle;
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tcon = __raw_readl(EXYNOS4_MCT_G_TCON);
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if (mode == CLOCK_EVT_MODE_PERIODIC) {
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tcon |= MCT_G_TCON_COMP0_AUTO_INC;
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exynos4_mct_write(cycles, EXYNOS4_MCT_G_COMP0_ADD_INCR);
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}
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comp_cycle = exynos4_frc_read(&mct_frc) + cycles;
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exynos4_mct_write((u32)comp_cycle, EXYNOS4_MCT_G_COMP0_L);
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exynos4_mct_write((u32)(comp_cycle >> 32), EXYNOS4_MCT_G_COMP0_U);
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exynos4_mct_write(0x1, EXYNOS4_MCT_G_INT_ENB);
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tcon |= MCT_G_TCON_COMP0_ENABLE;
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exynos4_mct_write(tcon , EXYNOS4_MCT_G_TCON);
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}
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static int exynos4_comp_set_next_event(unsigned long cycles,
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struct clock_event_device *evt)
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{
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exynos4_mct_comp0_start(evt->mode, cycles);
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return 0;
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}
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static void exynos4_comp_set_mode(enum clock_event_mode mode,
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struct clock_event_device *evt)
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{
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exynos4_mct_comp0_stop();
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switch (mode) {
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case CLOCK_EVT_MODE_PERIODIC:
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exynos4_mct_comp0_start(mode, clk_cnt_per_tick);
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break;
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case CLOCK_EVT_MODE_ONESHOT:
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case CLOCK_EVT_MODE_UNUSED:
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case CLOCK_EVT_MODE_SHUTDOWN:
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case CLOCK_EVT_MODE_RESUME:
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break;
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}
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}
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static struct clock_event_device mct_comp_device = {
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.name = "mct-comp",
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.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
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.rating = 250,
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.set_next_event = exynos4_comp_set_next_event,
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.set_mode = exynos4_comp_set_mode,
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};
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static irqreturn_t exynos4_mct_comp_isr(int irq, void *dev_id)
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{
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struct clock_event_device *evt = dev_id;
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exynos4_mct_write(0x1, EXYNOS4_MCT_G_INT_CSTAT);
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evt->event_handler(evt);
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return IRQ_HANDLED;
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}
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static struct irqaction mct_comp_event_irq = {
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.name = "mct_comp_irq",
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.flags = IRQF_TIMER | IRQF_IRQPOLL,
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.handler = exynos4_mct_comp_isr,
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.dev_id = &mct_comp_device,
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};
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static void exynos4_clockevent_init(void)
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{
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clk_cnt_per_tick = clk_rate / 2 / HZ;
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clockevents_calc_mult_shift(&mct_comp_device, clk_rate / 2, 5);
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mct_comp_device.max_delta_ns =
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clockevent_delta2ns(0xffffffff, &mct_comp_device);
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mct_comp_device.min_delta_ns =
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clockevent_delta2ns(0xf, &mct_comp_device);
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mct_comp_device.cpumask = cpumask_of(0);
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clockevents_register_device(&mct_comp_device);
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setup_irq(IRQ_MCT_G0, &mct_comp_event_irq);
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}
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#ifdef CONFIG_LOCAL_TIMERS
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/* Clock event handling */
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static void exynos4_mct_tick_stop(struct mct_clock_event_device *mevt)
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{
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unsigned long tmp;
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unsigned long mask = MCT_L_TCON_INT_START | MCT_L_TCON_TIMER_START;
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void __iomem *addr = mevt->base + MCT_L_TCON_OFFSET;
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tmp = __raw_readl(addr);
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if (tmp & mask) {
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tmp &= ~mask;
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exynos4_mct_write(tmp, addr);
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}
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}
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static void exynos4_mct_tick_start(unsigned long cycles,
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struct mct_clock_event_device *mevt)
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{
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unsigned long tmp;
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exynos4_mct_tick_stop(mevt);
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tmp = (1 << 31) | cycles; /* MCT_L_UPDATE_ICNTB */
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/* update interrupt count buffer */
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exynos4_mct_write(tmp, mevt->base + MCT_L_ICNTB_OFFSET);
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/* enable MCT tick interupt */
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exynos4_mct_write(0x1, mevt->base + MCT_L_INT_ENB_OFFSET);
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tmp = __raw_readl(mevt->base + MCT_L_TCON_OFFSET);
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tmp |= MCT_L_TCON_INT_START | MCT_L_TCON_TIMER_START |
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MCT_L_TCON_INTERVAL_MODE;
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exynos4_mct_write(tmp, mevt->base + MCT_L_TCON_OFFSET);
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}
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static int exynos4_tick_set_next_event(unsigned long cycles,
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struct clock_event_device *evt)
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{
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struct mct_clock_event_device *mevt = &mct_tick[smp_processor_id()];
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exynos4_mct_tick_start(cycles, mevt);
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return 0;
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}
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static inline void exynos4_tick_set_mode(enum clock_event_mode mode,
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struct clock_event_device *evt)
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{
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struct mct_clock_event_device *mevt = &mct_tick[smp_processor_id()];
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||||
exynos4_mct_tick_stop(mevt);
|
||||
|
||||
switch (mode) {
|
||||
case CLOCK_EVT_MODE_PERIODIC:
|
||||
exynos4_mct_tick_start(clk_cnt_per_tick, mevt);
|
||||
break;
|
||||
|
||||
case CLOCK_EVT_MODE_ONESHOT:
|
||||
case CLOCK_EVT_MODE_UNUSED:
|
||||
case CLOCK_EVT_MODE_SHUTDOWN:
|
||||
case CLOCK_EVT_MODE_RESUME:
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
static irqreturn_t exynos4_mct_tick_isr(int irq, void *dev_id)
|
||||
{
|
||||
struct mct_clock_event_device *mevt = dev_id;
|
||||
struct clock_event_device *evt = mevt->evt;
|
||||
|
||||
/*
|
||||
* This is for supporting oneshot mode.
|
||||
* Mct would generate interrupt periodically
|
||||
* without explicit stopping.
|
||||
*/
|
||||
if (evt->mode != CLOCK_EVT_MODE_PERIODIC)
|
||||
exynos4_mct_tick_stop(mevt);
|
||||
|
||||
/* Clear the MCT tick interrupt */
|
||||
exynos4_mct_write(0x1, mevt->base + MCT_L_INT_CSTAT_OFFSET);
|
||||
|
||||
evt->event_handler(evt);
|
||||
|
||||
return IRQ_HANDLED;
|
||||
}
|
||||
|
||||
static struct irqaction mct_tick0_event_irq = {
|
||||
.name = "mct_tick0_irq",
|
||||
.flags = IRQF_TIMER | IRQF_NOBALANCING,
|
||||
.handler = exynos4_mct_tick_isr,
|
||||
};
|
||||
|
||||
static struct irqaction mct_tick1_event_irq = {
|
||||
.name = "mct_tick1_irq",
|
||||
.flags = IRQF_TIMER | IRQF_NOBALANCING,
|
||||
.handler = exynos4_mct_tick_isr,
|
||||
};
|
||||
|
||||
static void exynos4_mct_tick_init(struct clock_event_device *evt)
|
||||
{
|
||||
unsigned int cpu = smp_processor_id();
|
||||
|
||||
mct_tick[cpu].evt = evt;
|
||||
|
||||
if (cpu == 0) {
|
||||
mct_tick[cpu].base = EXYNOS4_MCT_L0_BASE;
|
||||
evt->name = "mct_tick0";
|
||||
} else {
|
||||
mct_tick[cpu].base = EXYNOS4_MCT_L1_BASE;
|
||||
evt->name = "mct_tick1";
|
||||
}
|
||||
|
||||
evt->cpumask = cpumask_of(cpu);
|
||||
evt->set_next_event = exynos4_tick_set_next_event;
|
||||
evt->set_mode = exynos4_tick_set_mode;
|
||||
evt->features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT;
|
||||
evt->rating = 450;
|
||||
|
||||
clockevents_calc_mult_shift(evt, clk_rate / 2, 5);
|
||||
evt->max_delta_ns =
|
||||
clockevent_delta2ns(0x7fffffff, evt);
|
||||
evt->min_delta_ns =
|
||||
clockevent_delta2ns(0xf, evt);
|
||||
|
||||
clockevents_register_device(evt);
|
||||
|
||||
exynos4_mct_write(0x1, mct_tick[cpu].base + MCT_L_TCNTB_OFFSET);
|
||||
|
||||
if (cpu == 0) {
|
||||
mct_tick0_event_irq.dev_id = &mct_tick[cpu];
|
||||
setup_irq(IRQ_MCT_L0, &mct_tick0_event_irq);
|
||||
} else {
|
||||
mct_tick1_event_irq.dev_id = &mct_tick[cpu];
|
||||
irq_set_affinity(IRQ_MCT1, cpumask_of(1));
|
||||
setup_irq(IRQ_MCT_L1, &mct_tick1_event_irq);
|
||||
}
|
||||
}
|
||||
|
||||
/* Setup the local clock events for a CPU */
|
||||
void __cpuinit local_timer_setup(struct clock_event_device *evt)
|
||||
{
|
||||
exynos4_mct_tick_init(evt);
|
||||
}
|
||||
|
||||
int local_timer_ack(void)
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
#endif /* CONFIG_LOCAL_TIMERS */
|
||||
|
||||
static void __init exynos4_timer_resources(void)
|
||||
{
|
||||
struct clk *mct_clk;
|
||||
mct_clk = clk_get(NULL, "xtal");
|
||||
|
||||
clk_rate = clk_get_rate(mct_clk);
|
||||
}
|
||||
|
||||
static void __init exynos4_timer_init(void)
|
||||
{
|
||||
exynos4_timer_resources();
|
||||
exynos4_clocksource_init();
|
||||
exynos4_clockevent_init();
|
||||
}
|
||||
|
||||
struct sys_timer exynos4_timer = {
|
||||
.init = exynos4_timer_init,
|
||||
};
|
||||
Loading…
Reference in a new issue