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

2026-09-06 03:52:57 +08:00
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+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2004 Freescale Semiconductor.
+ * Jeff Brown
+ * Srikanth Srinivasan (srikanth.srinivasan@freescale.com)
+ *
+ * (C) Copyright 2000-2002
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ */
+
+#include <common.h>
+#include <mpc86xx.h>
+#include <asm/processor.h>
+#include <asm/io.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/* used in some defintiions of CONFIG_SYS_CLK_FREQ */
+extern unsigned long get_board_sys_clk(unsigned long dummy);
+
+void get_sys_info(sys_info_t *sys_info)
+{
+	volatile immap_t *immap = (immap_t *) CONFIG_SYS_IMMR;
+	volatile ccsr_gur_t *gur = &immap->im_gur;
+	uint plat_ratio, e600_ratio;
+
+	plat_ratio = (gur->porpllsr) & 0x0000003e;
+	plat_ratio >>= 1;
+
+	switch (plat_ratio) {
+	case 0x0:
+		sys_info->freq_systembus = 16 * CONFIG_SYS_CLK_FREQ;
+		break;
+	case 0x02:
+	case 0x03:
+	case 0x04:
+	case 0x05:
+	case 0x06:
+	case 0x08:
+	case 0x09:
+	case 0x0a:
+	case 0x0c:
+	case 0x10:
+		sys_info->freq_systembus = plat_ratio * CONFIG_SYS_CLK_FREQ;
+		break;
+	default:
+		sys_info->freq_systembus = 0;
+		break;
+	}
+
+	e600_ratio = (gur->porpllsr) & 0x003f0000;
+	e600_ratio >>= 16;
+
+	switch (e600_ratio) {
+	case 0x10:
+		sys_info->freq_processor = 2 * sys_info->freq_systembus;
+		break;
+	case 0x19:
+		sys_info->freq_processor = 5 * sys_info->freq_systembus / 2;
+		break;
+	case 0x20:
+		sys_info->freq_processor = 3 * sys_info->freq_systembus;
+		break;
+	case 0x39:
+		sys_info->freq_processor = 7 * sys_info->freq_systembus / 2;
+		break;
+	case 0x28:
+		sys_info->freq_processor = 4 * sys_info->freq_systembus;
+		break;
+	case 0x1d:
+		sys_info->freq_processor = 9 * sys_info->freq_systembus / 2;
+		break;
+	default:
+		sys_info->freq_processor = e600_ratio +
+						sys_info->freq_systembus;
+		break;
+	}
+
+	sys_info->freq_localbus = sys_info->freq_systembus;
+}
+
+
+/*
+ * Measure CPU clock speed (core clock GCLK1, GCLK2)
+ * (Approx. GCLK frequency in Hz)
+ */
+
+int get_clocks(void)
+{
+	sys_info_t sys_info;
+
+	get_sys_info(&sys_info);
+	gd->cpu_clk = sys_info.freq_processor;
+	gd->bus_clk = sys_info.freq_systembus;
+	gd->arch.lbc_clk = sys_info.freq_localbus;
+
+	/*
+	 * The base clock for I2C depends on the actual SOC.  Unfortunately,
+	 * there is no pattern that can be used to determine the frequency, so
+	 * the only choice is to look up the actual SOC number and use the value
+	 * for that SOC. This information is taken from application note
+	 * AN2919.
+	 */
+#ifdef CONFIG_ARCH_MPC8610
+	gd->arch.i2c1_clk = sys_info.freq_systembus;
+#else
+	gd->arch.i2c1_clk = sys_info.freq_systembus / 2;
+#endif
+	gd->arch.i2c2_clk = gd->arch.i2c1_clk;
+
+	if (gd->cpu_clk != 0)
+		return 0;
+	else
+		return 1;
+}
+
+
+/*
+ * get_bus_freq
+ *	Return system bus freq in Hz
+ */
+
+ulong get_bus_freq(ulong dummy)
+{
+	ulong val;
+	sys_info_t sys_info;
+
+	get_sys_info(&sys_info);
+	val = sys_info.freq_systembus;
+
+	return val;
+}