mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-28 13:53:44 +09:00
83d290c56f
When U-Boot started using SPDX tags we were among the early adopters and there weren't a lot of other examples to borrow from. So we picked the area of the file that usually had a full license text and replaced it with an appropriate SPDX-License-Identifier: entry. Since then, the Linux Kernel has adopted SPDX tags and they place it as the very first line in a file (except where shebangs are used, then it's second line) and with slightly different comment styles than us. In part due to community overlap, in part due to better tag visibility and in part for other minor reasons, switch over to that style. This commit changes all instances where we have a single declared license in the tag as both the before and after are identical in tag contents. There's also a few places where I found we did not have a tag and have introduced one. Signed-off-by: Tom Rini <trini@konsulko.com>
130 lines
3.0 KiB
C
130 lines
3.0 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright 2014 Broadcom Corporation.
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*/
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#include <common.h>
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#include <div64.h>
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#include <asm/io.h>
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#include <asm/iproc-common/timer.h>
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#include <asm/iproc-common/sysmap.h>
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static inline uint64_t timer_global_read(void)
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{
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uint64_t cur_tick;
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uint32_t count_h;
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uint32_t count_l;
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do {
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count_h = readl(IPROC_PERIPH_GLB_TIM_REG_BASE +
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TIMER_GLB_HI_OFFSET);
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count_l = readl(IPROC_PERIPH_GLB_TIM_REG_BASE +
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TIMER_GLB_LOW_OFFSET);
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cur_tick = readl(IPROC_PERIPH_GLB_TIM_REG_BASE +
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TIMER_GLB_HI_OFFSET);
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} while (cur_tick != count_h);
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return (cur_tick << 32) + count_l;
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}
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void timer_global_init(void)
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{
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writel(0, IPROC_PERIPH_GLB_TIM_REG_BASE + TIMER_GLB_CTRL_OFFSET);
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writel(0, IPROC_PERIPH_GLB_TIM_REG_BASE + TIMER_GLB_LOW_OFFSET);
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writel(0, IPROC_PERIPH_GLB_TIM_REG_BASE + TIMER_GLB_HI_OFFSET);
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writel(TIMER_GLB_TIM_CTRL_TIM_EN,
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IPROC_PERIPH_GLB_TIM_REG_BASE + TIMER_GLB_CTRL_OFFSET);
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}
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int timer_init(void)
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{
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timer_global_init();
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return 0;
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}
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unsigned long get_timer(unsigned long base)
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{
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uint64_t count;
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uint64_t ret;
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uint64_t tim_clk;
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uint64_t periph_clk;
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count = timer_global_read();
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/* default arm clk is 1GHz, periph_clk=arm_clk/2, tick per msec */
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periph_clk = 500000;
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tim_clk = lldiv(periph_clk,
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(((readl(IPROC_PERIPH_GLB_TIM_REG_BASE +
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TIMER_GLB_CTRL_OFFSET) &
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TIMER_GLB_TIM_CTRL_PRESC_MASK) >> 8) + 1));
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ret = lldiv(count, (uint32_t)tim_clk);
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/* returns msec */
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return ret - base;
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}
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void __udelay(unsigned long usec)
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{
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uint64_t cur_tick, end_tick;
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uint64_t tim_clk;
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uint64_t periph_clk;
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/* default arm clk is 1GHz, periph_clk=arm_clk/2, tick per usec */
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periph_clk = 500;
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tim_clk = lldiv(periph_clk,
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(((readl(IPROC_PERIPH_GLB_TIM_REG_BASE +
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TIMER_GLB_CTRL_OFFSET) &
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TIMER_GLB_TIM_CTRL_PRESC_MASK) >> 8) + 1));
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cur_tick = timer_global_read();
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end_tick = tim_clk;
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end_tick *= usec;
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end_tick += cur_tick;
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do {
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cur_tick = timer_global_read();
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} while (cur_tick < end_tick);
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}
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void timer_systick_init(uint32_t tick_ms)
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{
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/* Disable timer and clear interrupt status*/
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writel(0, IPROC_PERIPH_PVT_TIM_REG_BASE + TIMER_PVT_CTRL_OFFSET);
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writel(TIMER_PVT_TIM_INT_STATUS_SET,
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IPROC_PERIPH_PVT_TIM_REG_BASE + TIMER_PVT_STATUS_OFFSET);
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writel((PLL_AXI_CLK/1000) * tick_ms,
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IPROC_PERIPH_PVT_TIM_REG_BASE + TIMER_PVT_LOAD_OFFSET);
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writel(TIMER_PVT_TIM_CTRL_INT_EN |
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TIMER_PVT_TIM_CTRL_AUTO_RELD |
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TIMER_PVT_TIM_CTRL_TIM_EN,
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IPROC_PERIPH_PVT_TIM_REG_BASE + TIMER_PVT_CTRL_OFFSET);
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}
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void timer_systick_isr(void *data)
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{
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writel(TIMER_PVT_TIM_INT_STATUS_SET,
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IPROC_PERIPH_PVT_TIM_REG_BASE + TIMER_PVT_STATUS_OFFSET);
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}
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/*
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* This function is derived from PowerPC code (read timebase as long long).
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* On ARM it just returns the timer value in msec.
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*/
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unsigned long long get_ticks(void)
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{
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return get_timer(0);
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}
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/*
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* This is used in conjuction with get_ticks, which returns msec as ticks.
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* Here we just return ticks/sec = msec/sec = 1000
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*/
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ulong get_tbclk(void)
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{
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return 1000;
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}
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