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- // SPDX-License-Identifier: GPL-2.0+
- /*
- * Copyright 2014 Broadcom Corporation.
- */
- #include <common.h>
- #include <div64.h>
- #include <init.h>
- #include <time.h>
- #include <asm/io.h>
- #include <asm/iproc-common/timer.h>
- #include <asm/iproc-common/sysmap.h>
- #include <linux/delay.h>
- static inline uint64_t timer_global_read(void)
- {
- uint64_t cur_tick;
- uint32_t count_h;
- uint32_t count_l;
- do {
- count_h = readl(IPROC_PERIPH_GLB_TIM_REG_BASE +
- TIMER_GLB_HI_OFFSET);
- count_l = readl(IPROC_PERIPH_GLB_TIM_REG_BASE +
- TIMER_GLB_LOW_OFFSET);
- cur_tick = readl(IPROC_PERIPH_GLB_TIM_REG_BASE +
- TIMER_GLB_HI_OFFSET);
- } while (cur_tick != count_h);
- return (cur_tick << 32) + count_l;
- }
- void timer_global_init(void)
- {
- writel(0, IPROC_PERIPH_GLB_TIM_REG_BASE + TIMER_GLB_CTRL_OFFSET);
- writel(0, IPROC_PERIPH_GLB_TIM_REG_BASE + TIMER_GLB_LOW_OFFSET);
- writel(0, IPROC_PERIPH_GLB_TIM_REG_BASE + TIMER_GLB_HI_OFFSET);
- writel(TIMER_GLB_TIM_CTRL_TIM_EN,
- IPROC_PERIPH_GLB_TIM_REG_BASE + TIMER_GLB_CTRL_OFFSET);
- }
- int timer_init(void)
- {
- timer_global_init();
- return 0;
- }
- unsigned long get_timer(unsigned long base)
- {
- uint64_t count;
- uint64_t ret;
- uint64_t tim_clk;
- uint64_t periph_clk;
- count = timer_global_read();
- /* default arm clk is 1GHz, periph_clk=arm_clk/2, tick per msec */
- periph_clk = 500000;
- tim_clk = lldiv(periph_clk,
- (((readl(IPROC_PERIPH_GLB_TIM_REG_BASE +
- TIMER_GLB_CTRL_OFFSET) &
- TIMER_GLB_TIM_CTRL_PRESC_MASK) >> 8) + 1));
- ret = lldiv(count, (uint32_t)tim_clk);
- /* returns msec */
- return ret - base;
- }
- void __udelay(unsigned long usec)
- {
- uint64_t cur_tick, end_tick;
- uint64_t tim_clk;
- uint64_t periph_clk;
- /* default arm clk is 1GHz, periph_clk=arm_clk/2, tick per usec */
- periph_clk = 500;
- tim_clk = lldiv(periph_clk,
- (((readl(IPROC_PERIPH_GLB_TIM_REG_BASE +
- TIMER_GLB_CTRL_OFFSET) &
- TIMER_GLB_TIM_CTRL_PRESC_MASK) >> 8) + 1));
- cur_tick = timer_global_read();
- end_tick = tim_clk;
- end_tick *= usec;
- end_tick += cur_tick;
- do {
- cur_tick = timer_global_read();
- } while (cur_tick < end_tick);
- }
- void timer_systick_init(uint32_t tick_ms)
- {
- /* Disable timer and clear interrupt status*/
- writel(0, IPROC_PERIPH_PVT_TIM_REG_BASE + TIMER_PVT_CTRL_OFFSET);
- writel(TIMER_PVT_TIM_INT_STATUS_SET,
- IPROC_PERIPH_PVT_TIM_REG_BASE + TIMER_PVT_STATUS_OFFSET);
- writel((PLL_AXI_CLK/1000) * tick_ms,
- IPROC_PERIPH_PVT_TIM_REG_BASE + TIMER_PVT_LOAD_OFFSET);
- writel(TIMER_PVT_TIM_CTRL_INT_EN |
- TIMER_PVT_TIM_CTRL_AUTO_RELD |
- TIMER_PVT_TIM_CTRL_TIM_EN,
- IPROC_PERIPH_PVT_TIM_REG_BASE + TIMER_PVT_CTRL_OFFSET);
- }
- void timer_systick_isr(void *data)
- {
- writel(TIMER_PVT_TIM_INT_STATUS_SET,
- IPROC_PERIPH_PVT_TIM_REG_BASE + TIMER_PVT_STATUS_OFFSET);
- }
- /*
- * This function is derived from PowerPC code (read timebase as long long).
- * On ARM it just returns the timer value in msec.
- */
- unsigned long long get_ticks(void)
- {
- return get_timer(0);
- }
- /*
- * This is used in conjuction with get_ticks, which returns msec as ticks.
- * Here we just return ticks/sec = msec/sec = 1000
- */
- ulong get_tbclk(void)
- {
- return 1000;
- }
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