1 files changed, 104 insertions, 0 deletions
diff --git a/arch/arm/mach-pxa/pxa25x.c b/arch/arm/mach-pxa/pxa25x.c
new file mode 100644
index 0000000..e887b71
--- /dev/null
+++ b/arch/arm/mach-pxa/pxa25x.c
@@ -0,0 +1,104 @@
+/*
+ *  linux/arch/arm/mach-pxa/pxa25x.c
+ *
+ *  Author:	Nicolas Pitre
+ *  Created:	Jun 15, 2001
+ *  Copyright:	MontaVista Software Inc.
+ *
+ * Code specific to PXA21x/25x/26x variants.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Since this file should be linked before any other machine specific file,
+ * the __initcall() here will be executed first.  This serves as default
+ * initialization stuff for PXA machines which can be overridden later if
+ * need be.
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/pm.h>
+
+#include <asm/hardware.h>
+#include <asm/arch/pxa-regs.h>
+
+#include "generic.h"
+
+/*
+ * Various clock factors driven by the CCCR register.
+ */
+
+/* Crystal Frequency to Memory Frequency Multiplier (L) */
+static unsigned char L_clk_mult[32] = { 0, 27, 32, 36, 40, 45, 0, };
+
+/* Memory Frequency to Run Mode Frequency Multiplier (M) */
+static unsigned char M_clk_mult[4] = { 0, 1, 2, 4 };
+
+/* Run Mode Frequency to Turbo Mode Frequency Multiplier (N) */
+/* Note: we store the value N * 2 here. */
+static unsigned char N2_clk_mult[8] = { 0, 0, 2, 3, 4, 0, 6, 0 };
+
+/* Crystal clock */
+#define BASE_CLK	3686400
+
+/*
+ * Get the clock frequency as reflected by CCCR and the turbo flag.
+ * We assume these values have been applied via a fcs.
+ * If info is not 0 we also display the current settings.
+ */
+unsigned int get_clk_frequency_khz(int info)
+{
+	unsigned long cccr, turbo;
+	unsigned int l, L, m, M, n2, N;
+
+	cccr = CCCR;
+	asm( "mrc\tp14, 0, %0, c6, c0, 0" : "=r" (turbo) );
+
+	l  =  L_clk_mult[(cccr >> 0) & 0x1f];
+	m  =  M_clk_mult[(cccr >> 5) & 0x03];
+	n2 = N2_clk_mult[(cccr >> 7) & 0x07];
+
+	L = l * BASE_CLK;
+	M = m * L;
+	N = n2 * M / 2;
+
+	if(info)
+	{
+		L += 5000;
+		printk( KERN_INFO "Memory clock: %d.%02dMHz (*%d)\n",
+			L / 1000000, (L % 1000000) / 10000, l );
+		M += 5000;
+		printk( KERN_INFO "Run Mode clock: %d.%02dMHz (*%d)\n",
+			M / 1000000, (M % 1000000) / 10000, m );
+		N += 5000;
+		printk( KERN_INFO "Turbo Mode clock: %d.%02dMHz (*%d.%d, %sactive)\n",
+			N / 1000000, (N % 1000000) / 10000, n2 / 2, (n2 % 2) * 5,
+			(turbo & 1) ? "" : "in" );
+	}
+
+	return (turbo & 1) ? (N/1000) : (M/1000);
+}
+
+EXPORT_SYMBOL(get_clk_frequency_khz);
+
+/*
+ * Return the current memory clock frequency in units of 10kHz
+ */
+unsigned int get_memclk_frequency_10khz(void)
+{
+	return L_clk_mult[(CCCR >> 0) & 0x1f] * BASE_CLK / 10000;
+}
+
+EXPORT_SYMBOL(get_memclk_frequency_10khz);
+
+/*
+ * Return the current LCD clock frequency in units of 10kHz
+ */
+unsigned int get_lcdclk_frequency_10khz(void)
+{
+	return get_memclk_frequency_10khz();
+}
+
+EXPORT_SYMBOL(get_lcdclk_frequency_10khz);