u5500: add mailbox1 and related function support

Add cpufreq-db5500.c file for db5500 CPUfreq support.

PRCMU mailbox1 and related functions' support is added.
List of functions implemented:
- prcmu_get/set_arm_opp
- read_mailbox_1

ST-Ericsson Linux next: -
ST-Ericsson ID: WP334774
ST-Ericsson FOSS-OUT ID: Trivial

Change-Id: I6dabc714dac70d4302450a2216644dc63ae88084
Signed-off-by: Shreshtha Kumar Sahu <shreshthakumar.sahu@stericsson.com>
Reviewed-on: http://gerrit.lud.stericsson.com/gerrit/24956
Reviewed-by: QATEST
Reviewed-by: Linus WALLEIJ <linus.walleij@stericsson.com>
Reviewed-by: Per-Inge TALLBERG <per-inge.tallberg@stericsson.com>
Reviewed-by: Jonas ABERG <jonas.aberg@stericsson.com>

Fix for PRCMU

1 files changed, 51 insertions, 0 deletions

diff --git a/arch/arm/mach-ux500/pm/cpufreq-db5500.c b/arch/arm/mach-ux500/pm/cpufreq-db5500.c
new file mode 100644
index 00000000000..c68caa064e1
--- /dev/null
+++ b/arch/arm/mach-ux500/pm/cpufreq-db5500.c
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) ST-Ericsson SA 2011
+ *
+ * License Terms: GNU General Public License v2
+ */
+
+#include <linux/kernel.h>
+#include <linux/cpufreq.h>
+
+#include <mach/prcmu.h>
+
+#include "cpufreq.h"
+
+static struct cpufreq_frequency_table freq_table[] = {
+	[0] = {
+		.index = 0,
+		.frequency = 200000,
+	},
+	[1] = {
+		.index = 1,
+		.frequency = 300000,
+	},
+	[2] = {
+		.index = 2,
+		.frequency = 600000,
+	},
+	[3] = {
+		.index = 3,
+		.frequency = CPUFREQ_TABLE_END,
+	},
+};
+
+static enum arm_opp idx2opp[] = {
+	ARM_EXTCLK,
+	ARM_50_OPP,
+	ARM_100_OPP,
+};
+
+static int __init u5500_cpufreq_register(void)
+{
+	int i = 0;
+
+	BUILD_BUG_ON(ARRAY_SIZE(idx2opp) + 1 != ARRAY_SIZE(freq_table));
+
+	pr_info("u5500-cpufreq : Available frequencies:\n");
+	while (freq_table[i].frequency != CPUFREQ_TABLE_END)
+		pr_info("  %d Mhz\n", freq_table[i++].frequency/1000);
+
+	return ux500_cpufreq_register(freq_table, idx2opp);
+}
+device_initcall(u5500_cpufreq_register);