diff options
Diffstat (limited to 'arch/arm/cpu/armv7/u8500/timer.c')
-rw-r--r-- | arch/arm/cpu/armv7/u8500/timer.c | 135 |
1 files changed, 0 insertions, 135 deletions
diff --git a/arch/arm/cpu/armv7/u8500/timer.c b/arch/arm/cpu/armv7/u8500/timer.c deleted file mode 100644 index 6b74e13d9c..0000000000 --- a/arch/arm/cpu/armv7/u8500/timer.c +++ /dev/null @@ -1,135 +0,0 @@ -/* - * Copyright (C) 2010 Linaro Limited - * John Rigby <john.rigby@linaro.org> - * - * Based on original from Linux kernel source and - * internal ST-Ericsson U-Boot source. - * (C) Copyright 2009 Alessandro Rubini - * (C) Copyright 2010 ST-Ericsson - * - * SPDX-License-Identifier: GPL-2.0+ - */ - -#include <common.h> -#include <asm/io.h> -#include <asm/arch/hardware.h> - -DECLARE_GLOBAL_DATA_PTR; - -/* - * The MTU device has some interrupt control registers - * followed by 4 timers. - */ - -/* The timers */ -struct u8500_mtu_timer { - u32 lr; /* Load value */ - u32 cv; /* Current value */ - u32 cr; /* Control reg */ - u32 bglr; /* ??? */ -}; - -/* The MTU that contains the timers */ -struct u8500_mtu { - u32 imsc; /* Interrupt mask set/clear */ - u32 ris; /* Raw interrupt status */ - u32 mis; /* Masked interrupt status */ - u32 icr; /* Interrupt clear register */ - struct u8500_mtu_timer pt[4]; -}; - -/* bits for the control register */ -#define MTU_CR_ONESHOT 0x01 /* if 0 = wraps reloading from BGLR */ -#define MTU_CR_32BITS 0x02 - -#define MTU_CR_PRESCALE_1 0x00 -#define MTU_CR_PRESCALE_16 0x04 -#define MTU_CR_PRESCALE_256 0x08 -#define MTU_CR_PRESCALE_MASK 0x0c - -#define MTU_CR_PERIODIC 0x40 /* if 0 = free-running */ -#define MTU_CR_ENA 0x80 - -/* - * The MTU is clocked at 133 MHz by default. (V1 and later) - */ -#define TIMER_CLOCK (133 * 1000 * 1000 / 16) -#define COUNT_TO_USEC(x) ((x) * 16 / 133) -#define USEC_TO_COUNT(x) ((x) * 133 / 16) -#define TICKS_PER_HZ (TIMER_CLOCK / CONFIG_SYS_HZ) -#define TICKS_TO_HZ(x) ((x) / TICKS_PER_HZ) -#define TIMER_LOAD_VAL 0xffffffff - -/* - * MTU timer to use (from 0 to 3). - */ -#define MTU_TIMER 2 - -static struct u8500_mtu_timer *timer_base = - &((struct u8500_mtu *)U8500_MTU0_BASE_V1)->pt[MTU_TIMER]; - -/* macro to read the 32 bit timer: since it decrements, we invert read value */ -#define READ_TIMER() (~readl(&timer_base->cv)) - -/* Configure a free-running, auto-wrap counter with /16 prescaler */ -int timer_init(void) -{ - writel(MTU_CR_ENA | MTU_CR_PRESCALE_16 | MTU_CR_32BITS, - &timer_base->cr); - return 0; -} - -ulong get_timer_masked(void) -{ - /* current tick value */ - ulong now = TICKS_TO_HZ(READ_TIMER()); - - if (now >= gd->arch.lastinc) { /* normal (non rollover) */ - gd->arch.tbl += (now - gd->arch.lastinc); - } else { /* rollover */ - gd->arch.tbl += (TICKS_TO_HZ(TIMER_LOAD_VAL) - - gd->arch.lastinc) + now; - } - gd->arch.lastinc = now; - return gd->arch.tbl; -} - -/* Delay x useconds */ -void __udelay(ulong usec) -{ - long tmo = usec * (TIMER_CLOCK / 1000) / 1000; - ulong now, last = READ_TIMER(); - - while (tmo > 0) { - now = READ_TIMER(); - if (now > last) /* normal (non rollover) */ - tmo -= now - last; - else /* rollover */ - tmo -= TIMER_LOAD_VAL - last + now; - last = now; - } -} - -ulong get_timer(ulong base) -{ - return get_timer_masked() - base; -} - -/* - * Emulation of Power architecture long long timebase. - * - * TODO: Support gd->arch.tbu for real long long timebase. - */ -unsigned long long get_ticks(void) -{ - return get_timer(0); -} - -/* - * Emulation of Power architecture timebase. - * NB: Low resolution compared to Power tbclk. - */ -ulong get_tbclk(void) -{ - return CONFIG_SYS_HZ; -} |