[CPUFREQ] S5PV210: Add additional symantics for "relation" in cpufreq with pm

Relation has an additional symantics other than standard.
s5pv310_target funtion have below additional relation.
- DISABLE_FURTHER_CPUFREQ : disable further access to target
- ENABLE_FURTHER_CPUFRER : enable access to target

Signed-off-by: Huisung Kang <hs1218.kang@samsung.com>
Signed-off-by: Jonghwan Choi <jhbird.choi@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Dave Jones <davej@redhat.com>

1 files changed, 28 insertions, 0 deletions

diff --git a/drivers/cpufreq/s5pv210-cpufreq.c b/drivers/cpufreq/s5pv210-cpufreq.c
index a7cb3385bf5e..48a4a9058864 100644
--- a/drivers/cpufreq/s5pv210-cpufreq.c
+++ b/drivers/cpufreq/s5pv210-cpufreq.c
@@ -30,6 +30,18 @@ static struct cpufreq_freqs freqs;
 #define APLL_VAL_800    ((1 << 31) | (100 << 16) | (3 << 8) | 1)
 
 /*
+ * relation has an additional symantics other than the standard of cpufreq
+ * DISALBE_FURTHER_CPUFREQ: disable further access to target
+ * ENABLE_FURTUER_CPUFREQ: enable access to target
+ */
+enum cpufreq_access {
+        DISABLE_FURTHER_CPUFREQ = 0x10,
+        ENABLE_FURTHER_CPUFREQ = 0x20,
+};
+
+static bool no_cpufreq_access;
+
+/*
  * DRAM configurations to calculate refresh counter for changing
  * frequency of memory.
  */
@@ -146,6 +158,22 @@ static int s5pv210_target(struct cpufreq_policy *policy,
         unsigned int pll_changing = 0;
         unsigned int bus_speed_changing = 0;
 
+        if (relation & ENABLE_FURTHER_CPUFREQ)
+                no_cpufreq_access = false;
+
+        if (no_cpufreq_access) {
+#ifdef CONFIG_PM_VERBOSE
+                pr_err("%s:%d denied access to %s as it is disabled"
+                                "temporarily\n", __FILE__, __LINE__, __func__);
+#endif
+                return -EINVAL;
+        }
+
+        if (relation & DISABLE_FURTHER_CPUFREQ)
+                no_cpufreq_access = true;
+
+        relation &= ~(ENABLE_FURTHER_CPUFREQ | DISABLE_FURTHER_CPUFREQ);
+
         freqs.old = s5pv210_getspeed(0);
 
         if (cpufreq_frequency_table_target(policy, s5pv210_freq_table,