cpufreq: boost: Provide support for BOOST on linux-3.10-tizen

This code reads from device tree the boost_freq attribute and properly
modify the cpufreq table to support BOOST framework.

This attribute is only read when CONFIG_CPU_FREQ_BOOST_SW flag is set.

Change-Id: I16fcba69b16c29434e3ec1a8a0ef1bc8bdebc0ca
Signed-off-by: Lukasz Majewski <l.majewski@samsung.com>

diff --git a/drivers/cpufreq/exynos-cpufreq.c b/drivers/cpufreq/exynos-cpufreq.c
index 249d19b..0ecb7c9 100644 (file)
--- a/drivers/cpufreq/exynos-cpufreq.c
+++ b/drivers/cpufreq/exynos-cpufreq.c
@@ -288,6 +288,36 @@ static struct cpufreq_driver exynos_driver = {
 
 /* Device Tree Support for CPU freq */
 
+int exynos_of_parse_boost(struct exynos_dvfs_info *info,
+                         const char *property_name)
+{
+       struct cpufreq_frequency_table *ft = info->freq_table;
+       struct device_node *node = info->dev->of_node;
+       unsigned int boost_freq;
+
+       if (of_property_read_u32(node, property_name, &boost_freq)) {
+               pr_err("%s: Property: %s not found\n", __func__,
+                      property_name);
+               return -ENODEV;
+       }
+
+       /*
+        * Adjust the BOOST setting code to the current cpufreq code
+        * Now we have static table definitions for frequencies, dividers
+        * and PLL parameters (like P M S)
+        *
+        * In the current cpufreq code base only the change of one entry at
+        * frequency table is required.
+        */
+
+       ft[0].index = CPUFREQ_BOOST_FREQ;
+       ft[0].frequency = boost_freq;
+
+       pr_debug("%s: BOOST frequency: %d\n", __func__, ft[0].frequency);
+
+       return 0;
+}
+
 struct cpufreq_frequency_table *exynos_of_parse_freq_table(
                struct exynos_dvfs_info *info, const char *property_name)
 {
@@ -326,8 +356,12 @@ struct cpufreq_frequency_table *exynos_of_parse_freq_table(
                goto err_of_f_tab;
        }
 
-       /* Here + 2 is required for CPUFREQ_ENTRY_INVALID and
-          CPUFREQ_TABLE_END  */
+       /*
+        * Here + 2 is required for CPUFREQ_ENTRY_INVALID  and
+        * CPUFREQ_TABLE_END
+        *
+        * Number of those entries must correspond to the apll_freq_4412 table
+        */
        ft = kzalloc(sizeof(struct cpufreq_frequency_table) * (num + 2),
                     GFP_KERNEL);
        if (!ft) {

diff --git a/drivers/cpufreq/exynos-cpufreq.h b/drivers/cpufreq/exynos-cpufreq.h
index 12b2b66..cb08d28 100644 (file)
--- a/drivers/cpufreq/exynos-cpufreq.h
+++ b/drivers/cpufreq/exynos-cpufreq.h
@@ -51,3 +51,5 @@ struct cpufreq_frequency_table *exynos_of_parse_freq_table(
        struct exynos_dvfs_info *info, const char *property_name);
 unsigned int *exynos_of_parse_volt_table(struct exynos_dvfs_info *info,
                                         const char *property_name);
+int exynos_of_parse_boost(struct exynos_dvfs_info *info,
+                         const char *property_name);

diff --git a/drivers/cpufreq/exynos4x12-cpufreq.c b/drivers/cpufreq/exynos4x12-cpufreq.c
index 410d087..e92d19b 100644 (file)
--- a/drivers/cpufreq/exynos4x12-cpufreq.c
+++ b/drivers/cpufreq/exynos4x12-cpufreq.c
@@ -203,6 +203,10 @@ int exynos4x12_cpufreq_init(struct exynos_dvfs_info *info)
        info->freq_table = exynos_of_parse_freq_table(info, "freq_table");
        if (!info->freq_table)
                info->freq_table = exynos4x12_freq_table;
+#ifdef CONFIG_CPU_FREQ_BOOST_SW
+       else
+               exynos_of_parse_boost(info, "boost_freq");
+#endif
 
        info->set_freq = exynos4x12_set_frequency;