ARM: pxa: reduce the scope of get_clk_frequency_khz()

get_clk_frequency_khz() is used in private cpufreq driver. In order to meet
the change of different pxa silicons, checking cpuid is introduced in
get_clk_frequency_khz(). While more pxa silicons are supported, the workload
of checking cpuid is higher.

So restrict the scope of get_clk_frequency_khz() on pxa2xx. Different pxa
silcions use different private cpufreq driver to avoid too much checking
on cpuid.
Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Cc: Eric Miao <eric.y.miao@gmail.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>

arch/arm/mach-pxa/cpufreq-pxa3xx.c

@@ -159,7 +159,7 @@ static int pxa3xx_cpufreq_verify(struct cpufreq_policy *policy)
 
 static unsigned int pxa3xx_cpufreq_get(unsigned int cpu)
 {
-	return get_clk_frequency_khz(0);
+	return pxa3xx_get_clk_frequency_khz(0);
 }
 
 static int pxa3xx_cpufreq_set(struct cpufreq_policy *policy,
@@ -212,7 +212,8 @@ static int pxa3xx_cpufreq_init(struct cpufreq_policy *policy)
 	policy->cpuinfo.min_freq = 104000;
 	policy->cpuinfo.max_freq = (cpu_is_pxa320()) ? 806000 : 624000;
 	policy->cpuinfo.transition_latency = 1000; /* FIXME: 1 ms, assumed */
-	policy->cur = policy->min = policy->max = get_clk_frequency_khz(0);
+	policy->max = pxa3xx_get_clk_frequency_khz(0);
+	policy->cur = policy->min = policy->max;
 
 	if (cpu_is_pxa300() || cpu_is_pxa310())
 		ret = setup_freqs_table(policy, ARRAY_AND_SIZE(pxa300_freqs));

arch/arm/mach-pxa/generic.c

@@ -66,8 +66,7 @@ unsigned int get_clk_frequency_khz(int info)
 		return pxa25x_get_clk_frequency_khz(info);
 	else if (cpu_is_pxa27x())
 		return pxa27x_get_clk_frequency_khz(info);
-	else
-		return pxa3xx_get_clk_frequency_khz(info);
+	return 0;
 }
 EXPORT_SYMBOL(get_clk_frequency_khz);