[ARM] S3C: Add <plat/cpu-freq.h> for initial cpufreq definitions

This is the header file that defines the basic cpu frequency
scalling support for the Samsung S3C series of SoC.
Signed-off-by: NBen Dooks <ben-linux@fluff.org>

arch/arm/plat-s3c/include/plat/cpu-freq.h

+/* arch/arm/plat-s3c/include/plat/cpu-freq.h
+ *
+ * Copyright (c) 2006,2007 Simtec Electronics
+ *	http://armlinux.simtec.co.uk/
+ *	Ben Dooks <ben@simtec.co.uk>
+ *
+ * S3C CPU frequency scaling support - driver and board
+ *
+ * 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.
+*/
+
+#include <linux/cpufreq.h>
+
+struct s3c_cpufreq_info;
+struct s3c_cpufreq_board;
+struct s3c_iotimings;
+
+struct s3c_freq {
+	unsigned long	fclk;
+	unsigned long	armclk;
+	unsigned long	hclk_tns;	/* in 10ths of ns */
+	unsigned long	hclk;
+	unsigned long	pclk;
+};
+
+/* wrapper 'struct cpufreq_freqs' so that any drivers receiving the
+ * notification can use this information that is not provided by just
+ * having the core frequency alone.
+ */
+
+struct s3c_cpufreq_freqs {
+	struct cpufreq_freqs	freqs;
+	struct s3c_freq		old;
+	struct s3c_freq		new;
+};
+
+#define to_s3c_cpufreq(_cf) container_of(_cf, struct s3c_cpufreq_freqs, freqs)
+
+struct s3c_clkdivs {
+	int		p_divisor;	/* fclk / pclk */
+	int		h_divisor;	/* fclk / hclk */
+	int		arm_divisor;	/* not all cpus have this. */
+	unsigned char	dvs;		/* using dvs mode to arm. */
+};
+
+#define PLLVAL(_m, _p, _s) (((_m) << 12) | ((_p) << 4) | (_s))
+
+struct s3c_pllval {
+	unsigned long		freq;
+	unsigned long		pll_reg;
+};
+
+struct s3c_cpufreq_config {
+	struct s3c_freq		freq;
+	struct s3c_pllval	pll;
+	struct s3c_clkdivs	divs;
+	struct s3c_cpufreq_info *info;	/* for core, not drivers */
+	struct s3c_cpufreq_board *board;
+};
+
+/* s3c_cpufreq_board
+ *
+ * per-board configuraton information, such as memory refresh and
+ * how to initialise IO timings.
+ */
+struct s3c_cpufreq_board {
+	unsigned int	refresh;	/* refresh period in ns */
+	unsigned int	auto_io:1;	/* automatically init io timings. */
+	unsigned int	need_io:1;	/* set if needs io timing support. */
+
+	/* any non-zero field in here is taken as an upper limit. */
+	struct s3c_freq	max;	/* frequency limits */
+};
+
+/* Things depending on frequency scaling. */
+#ifdef CONFIG_CPU_FREQ_S3C
+#define __init_or_cpufreq
+#else
+#define __init_or_cpufreq __init
+#endif
+
+/* Board functions */
+
+#ifdef CONFIG_CPU_FREQ_S3C
+extern int s3c_cpufreq_setboard(struct s3c_cpufreq_board *board);
+#else
+
+static inline int s3c_cpufreq_setboard(struct s3c_cpufreq_board *board)
+{
+	return 0;
+}
+#endif  /* CONFIG_CPU_FREQ_S3C */