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

source/bootloader/u-boot-2020.01/arch/arm/mach-davinci/cpu.c

@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2004 Texas Instruments.
+ * Copyright (C) 2009 David Brownell
+ */
+
+#include <common.h>
+#include <asm/arch/hardware.h>
+#include <asm/io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* offsets from PLL controller base */
+#define PLLC_PLLCTL	0x100
+#define PLLC_PLLM	0x110
+#define PLLC_PREDIV	0x114
+#define PLLC_PLLDIV1	0x118
+#define PLLC_PLLDIV2	0x11c
+#define PLLC_PLLDIV3	0x120
+#define PLLC_POSTDIV	0x128
+#define PLLC_BPDIV	0x12c
+#define PLLC_PLLDIV4	0x160
+#define PLLC_PLLDIV5	0x164
+#define PLLC_PLLDIV6	0x168
+#define PLLC_PLLDIV7	0x16c
+#define PLLC_PLLDIV8	0x170
+#define PLLC_PLLDIV9	0x174
+
+unsigned int sysdiv[9] = {
+	PLLC_PLLDIV1, PLLC_PLLDIV2, PLLC_PLLDIV3, PLLC_PLLDIV4, PLLC_PLLDIV5,
+	PLLC_PLLDIV6, PLLC_PLLDIV7, PLLC_PLLDIV8, PLLC_PLLDIV9
+};
+
+int clk_get(enum davinci_clk_ids id)
+{
+	int pre_div;
+	int pllm;
+	int post_div;
+	int pll_out;
+	unsigned int pll_base;
+
+	pll_out = CONFIG_SYS_OSCIN_FREQ;
+
+	if (id == DAVINCI_AUXCLK_CLKID)
+		goto out;
+
+	if ((id >> 16) == 1)
+		pll_base = (unsigned int)davinci_pllc1_regs;
+	else
+		pll_base = (unsigned int)davinci_pllc0_regs;
+
+	id &= 0xFFFF;
+
+	/*
+	 * Lets keep this simple. Combining operations can result in
+	 * unexpected approximations
+	 */
+	pre_div = (readl(pll_base + PLLC_PREDIV) &
+		DAVINCI_PLLC_DIV_MASK) + 1;
+	pllm = readl(pll_base + PLLC_PLLM) + 1;
+
+	pll_out /= pre_div;
+	pll_out *= pllm;
+
+	if (id == DAVINCI_PLLM_CLKID)
+		goto out;
+
+	post_div = (readl(pll_base + PLLC_POSTDIV) &
+		DAVINCI_PLLC_DIV_MASK) + 1;
+
+	pll_out /= post_div;
+
+	if (id == DAVINCI_PLLC_CLKID)
+		goto out;
+
+	pll_out /= (readl(pll_base + sysdiv[id - 1]) &
+		DAVINCI_PLLC_DIV_MASK) + 1;
+
+out:
+	return pll_out;
+}
+
+int set_cpu_clk_info(void)
+{
+	gd->bd->bi_arm_freq = clk_get(DAVINCI_ARM_CLKID) / 1000000;
+	/* DDR PHY uses an x2 input clock */
+	gd->bd->bi_ddr_freq = cpu_is_da830() ? 0 :
+				(clk_get(DAVINCI_DDR_CLKID) / 1000000);
+	gd->bd->bi_dsp_freq = 0;
+	return 0;
+}