GK SDK 源码库: XMIPCLinuxV100R005C00SPC030 (kernel/tools/open_source excluded)

2026-09-06 03:52:57 +08:00
commit b1928b41c0
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+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2014 Broadcom Corporation.
+ */
+
+#include <common.h>
+#include <div64.h>
+#include <time.h>
+#include <asm/io.h>
+#include <asm/iproc-common/timer.h>
+#include <asm/iproc-common/sysmap.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;
+}