[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: Ben Dooks <ben-linux@fluff.org>

1 files changed, 94 insertions, 0 deletions

diff --git a/arch/arm/plat-s3c/include/plat/cpu-freq.h b/arch/arm/plat-s3c/include/plat/cpu-freq.h
new file mode 100644
index 000000000000..c86a13307e90
--- /dev/null
+++ b/arch/arm/plat-s3c/include/plat/cpu-freq.h
@@ -0,0 +1,94 @@
+/* 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 */