1 files changed, 62 insertions, 0 deletions
diff --git a/arch/powerpc/cpu/mpc8xx/speed.c b/arch/powerpc/cpu/mpc8xx/speed.c
new file mode 100644
index 0000000000..751c089a6d
--- /dev/null
+++ b/arch/powerpc/cpu/mpc8xx/speed.c
@@ -0,0 +1,62 @@
+/*
+ * (C) Copyright 2000-2004
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <mpc8xx.h>
+#include <asm/processor.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+void get_brgclk(uint sccr)
+{
+	uint divider = 0;
+
+	switch((sccr&SCCR_DFBRG11)>>11){
+		case 0:
+			divider = 1;
+			break;
+		case 1:
+			divider = 4;
+			break;
+		case 2:
+			divider = 16;
+			break;
+		case 3:
+			divider = 64;
+			break;
+	}
+	gd->arch.brg_clk = gd->cpu_clk/divider;
+}
+
+/*
+ * get_clocks() fills in gd->cpu_clock depending on CONFIG_8xx_GCLK_FREQ
+ */
+int get_clocks (void)
+{
+	uint immr = get_immr (0);	/* Return full IMMR contents */
+	volatile immap_t *immap = (immap_t *) (immr & 0xFFFF0000);
+	uint sccr = immap->im_clkrst.car_sccr;
+	/*
+	 * If for some reason measuring the gclk frequency won't
+	 * work, we return the hardwired value.
+	 * (For example, the cogent CMA286-60 CPU module has no
+	 * separate oscillator for PITRTCLK)
+	 */
+	gd->cpu_clk = CONFIG_8xx_GCLK_FREQ;
+
+	if ((sccr & SCCR_EBDF11) == 0) {
+		/* No Bus Divider active */
+		gd->bus_clk = gd->cpu_clk;
+	} else {
+		/* The MPC8xx has only one BDF: half clock speed */
+		gd->bus_clk = gd->cpu_clk / 2;
+	}
+
+	get_brgclk(sccr);
+
+	return (0);
+}