From 48388b2a56ae5e0f1c422e84d536f31729469b17 Mon Sep 17 00:00:00 2001 From: Lennert Buytenhek Date: Mon, 18 Sep 2006 23:18:16 +0100 Subject: [PATCH] [ARM] 3822/1: iop3xx: rewrite time handling Merge and rewrite the iop32x/iop33x time code to do lost jiffy tracking properly, and put the result in plat-iop/time.c. Signed-off-by: Lennert Buytenhek Signed-off-by: Russell King --- arch/arm/plat-iop/Makefile | 2 +- arch/arm/plat-iop/time.c | 94 ++++++++++++++++++++++++++++ include/asm-arm/arch-iop32x/iop321.h | 6 ++ include/asm-arm/arch-iop33x/iop331.h | 6 ++ include/asm-arm/hardware/iop3xx.h | 20 ++++++ 5 files changed, 127 insertions(+), 1 deletion(-) create mode 100644 arch/arm/plat-iop/time.c diff --git a/arch/arm/plat-iop/Makefile b/arch/arm/plat-iop/Makefile index efde7a513fb7..d20cdec3a944 100644 --- a/arch/arm/plat-iop/Makefile +++ b/arch/arm/plat-iop/Makefile @@ -2,7 +2,7 @@ # Makefile for the linux kernel. # -obj-y := i2c.o pci.o setup.o +obj-y := i2c.o pci.o setup.o time.o obj-m := obj-n := obj- := diff --git a/arch/arm/plat-iop/time.c b/arch/arm/plat-iop/time.c new file mode 100644 index 000000000000..5730a0d7ed67 --- /dev/null +++ b/arch/arm/plat-iop/time.c @@ -0,0 +1,94 @@ +/* + * arch/arm/plat-iop/time.c + * + * Timer code for IOP32x and IOP33x based systems + * + * Author: Deepak Saxena + * + * Copyright 2002-2003 MontaVista Software Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#ifdef CONFIG_ARCH_IOP32X +#define IRQ_IOP3XX_TIMER0 IRQ_IOP321_TIMER0 +#else +#ifdef CONFIG_ARCH_IOP33X +#define IRQ_IOP3XX_TIMER0 IRQ_IOP331_TIMER0 +#endif +#endif + +static unsigned long ticks_per_jiffy; +static unsigned long ticks_per_usec; +static unsigned long next_jiffy_time; + +unsigned long iop3xx_gettimeoffset(void) +{ + unsigned long offset; + + offset = next_jiffy_time - *IOP3XX_TU_TCR1; + + return offset / ticks_per_usec; +} + +static irqreturn_t +iop3xx_timer_interrupt(int irq, void *dev_id, struct pt_regs *regs) +{ + write_seqlock(&xtime_lock); + + asm volatile("mcr p6, 0, %0, c6, c1, 0" : : "r" (1)); + + while ((signed long)(next_jiffy_time - *IOP3XX_TU_TCR1) + >= ticks_per_jiffy) { + timer_tick(regs); + next_jiffy_time -= ticks_per_jiffy; + } + + write_sequnlock(&xtime_lock); + + return IRQ_HANDLED; +} + +static struct irqaction iop3xx_timer_irq = { + .name = "IOP3XX Timer Tick", + .handler = iop3xx_timer_interrupt, + .flags = IRQF_DISABLED | IRQF_TIMER, +}; + +void __init iop3xx_init_time(unsigned long tick_rate) +{ + u32 timer_ctl; + + ticks_per_jiffy = (tick_rate + HZ/2) / HZ; + ticks_per_usec = tick_rate / 1000000; + next_jiffy_time = 0xffffffff; + + timer_ctl = IOP3XX_TMR_EN | IOP3XX_TMR_PRIVILEGED | + IOP3XX_TMR_RELOAD | IOP3XX_TMR_RATIO_1_1; + + /* + * We use timer 0 for our timer interrupt, and timer 1 as + * monotonic counter for tracking missed jiffies. + */ + asm volatile("mcr p6, 0, %0, c4, c1, 0" : : "r" (ticks_per_jiffy - 1)); + asm volatile("mcr p6, 0, %0, c0, c1, 0" : : "r" (timer_ctl)); + asm volatile("mcr p6, 0, %0, c5, c1, 0" : : "r" (0xffffffff)); + asm volatile("mcr p6, 0, %0, c1, c1, 0" : : "r" (timer_ctl)); + + setup_irq(IRQ_IOP3XX_TIMER0, &iop3xx_timer_irq); +} diff --git a/include/asm-arm/arch-iop32x/iop321.h b/include/asm-arm/arch-iop32x/iop321.h index e3c85a05e73a..bd96b8d55a76 100644 --- a/include/asm-arm/arch-iop32x/iop321.h +++ b/include/asm-arm/arch-iop32x/iop321.h @@ -233,6 +233,12 @@ /* for I2C bit defs see drivers/i2c/i2c-iop3xx.h */ +/* + * Peripherals that are shared between the iop32x and iop33x but + * located at different addresses. + */ +#define IOP3XX_TIMER_REG(reg) (IOP3XX_PERIPHERAL_VIRT_BASE + 0x07e0 + (reg)) + #include diff --git a/include/asm-arm/arch-iop33x/iop331.h b/include/asm-arm/arch-iop33x/iop331.h index e85e1a2e1a86..b301ef8f7f32 100644 --- a/include/asm-arm/arch-iop33x/iop331.h +++ b/include/asm-arm/arch-iop33x/iop331.h @@ -238,6 +238,12 @@ /* Reserved 0x0000178c through 0x000019ff */ +/* + * Peripherals that are shared between the iop32x and iop33x but + * located at different addresses. + */ +#define IOP3XX_TIMER_REG(reg) (IOP3XX_PERIPHERAL_VIRT_BASE + 0x07d0 + (reg)) + #include diff --git a/include/asm-arm/hardware/iop3xx.h b/include/asm-arm/hardware/iop3xx.h index d488ced2e12d..b21ea41b149e 100644 --- a/include/asm-arm/hardware/iop3xx.h +++ b/include/asm-arm/hardware/iop3xx.h @@ -81,6 +81,24 @@ #define IOP3XX_PCIXSR (volatile u32 *)IOP3XX_REG_ADDR(0x01e4) #define IOP3XX_PCIIRSR (volatile u32 *)IOP3XX_REG_ADDR(0x01ec) +/* Timers */ +#define IOP3XX_TU_TMR0 (volatile u32 *)IOP3XX_TIMER_REG(0x0000) +#define IOP3XX_TU_TMR1 (volatile u32 *)IOP3XX_TIMER_REG(0x0004) +#define IOP3XX_TU_TCR0 (volatile u32 *)IOP3XX_TIMER_REG(0x0008) +#define IOP3XX_TU_TCR1 (volatile u32 *)IOP3XX_TIMER_REG(0x000c) +#define IOP3XX_TU_TRR0 (volatile u32 *)IOP3XX_TIMER_REG(0x0010) +#define IOP3XX_TU_TRR1 (volatile u32 *)IOP3XX_TIMER_REG(0x0014) +#define IOP3XX_TU_TISR (volatile u32 *)IOP3XX_TIMER_REG(0x0018) +#define IOP3XX_TU_WDTCR (volatile u32 *)IOP3XX_TIMER_REG(0x001c) +#define IOP3XX_TMR_TC 0x01 +#define IOP3XX_TMR_EN 0x02 +#define IOP3XX_TMR_RELOAD 0x04 +#define IOP3XX_TMR_PRIVILEGED 0x09 +#define IOP3XX_TMR_RATIO_1_1 0x00 +#define IOP3XX_TMR_RATIO_4_1 0x10 +#define IOP3XX_TMR_RATIO_8_1 0x20 +#define IOP3XX_TMR_RATIO_16_1 0x30 + /* I2C bus interface unit */ #define IOP3XX_ICR0 (volatile u32 *)IOP3XX_REG_ADDR(0x1680) #define IOP3XX_ISR0 (volatile u32 *)IOP3XX_REG_ADDR(0x1684) @@ -109,6 +127,8 @@ #ifndef __ASSEMBLY__ void iop3xx_map_io(void); +void iop3xx_init_time(unsigned long); +unsigned long iop3xx_gettimeoffset(void); extern struct platform_device iop3xx_i2c0_device; extern struct platform_device iop3xx_i2c1_device; -- 2.20.1