[PATCH v2] cpufreq: mediatek-hw: Register EM power table

[PATCH v2] cpufreq: mediatek-hw: Register EM power table

[Hector Yuan]

Register to energy model framework with CPU power efficiency table.

This patch depends on Mediatek cpufreq HW driver patch submitted by Hector Yuan.
 https://lkml.org/lkml/2020/9/10/13


Hector.Yuan (1):
  cpufreq: mediatek-hw: Register EM power table

 drivers/cpufreq/mediatek-cpufreq-hw.c |   58 ++++++++++++++++++++++++++-------
 1 file changed, 46 insertions(+), 12 deletions(-)
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[PATCH v2 1/1] cpufreq: mediatek-hw: Register EM power table

[Hector Yuan]

From: "Hector.Yuan" <hector.yuan@mediatek.com>

Register CPU power table to energy model framework

Signed-off-by: Hector.Yuan <hector.yuan@mediatek.com>
---
 drivers/cpufreq/mediatek-cpufreq-hw.c |   58 ++++++++++++++++++++++++++-------
 1 file changed, 46 insertions(+), 12 deletions(-)

diff --git a/drivers/cpufreq/mediatek-cpufreq-hw.c b/drivers/cpufreq/mediatek-cpufreq-hw.c
index 8fa12e5..379a5f4 100644
--- a/drivers/cpufreq/mediatek-cpufreq-hw.c
+++ b/drivers/cpufreq/mediatek-cpufreq-hw.c
@@ -5,6 +5,7 @@
 
 #include <linux/bitfield.h>
 #include <linux/cpufreq.h>
+#include <linux/energy_model.h>
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
@@ -17,9 +18,10 @@
 #define LUT_ROW_SIZE			0x4
 
 enum {
-	REG_LUT_TABLE,
-	REG_ENABLE,
-	REG_PERF_STATE,
+	REG_FREQ_LUT_TABLE,
+	REG_FREQ_ENABLE,
+	REG_FREQ_PERF_STATE,
+	REG_EM_POWER_TBL,
 
 	REG_ARRAY_SIZE,
 };
@@ -27,23 +29,44 @@ enum {
 struct cpufreq_mtk {
 	struct cpufreq_frequency_table *table;
 	void __iomem *reg_bases[REG_ARRAY_SIZE];
+	int nr_opp;
 	cpumask_t related_cpus;
 };
 
 static const u16 cpufreq_mtk_offsets[REG_ARRAY_SIZE] = {
-	[REG_LUT_TABLE]		= 0x0,
-	[REG_ENABLE]		= 0x84,
-	[REG_PERF_STATE]	= 0x88,
+	[REG_FREQ_LUT_TABLE]	= 0x0,
+	[REG_FREQ_ENABLE]	= 0x84,
+	[REG_FREQ_PERF_STATE]	= 0x88,
+	[REG_EM_POWER_TBL]	= 0x3D0,
 };
 
 static struct cpufreq_mtk *mtk_freq_domain_map[NR_CPUS];
 
+static int mtk_cpufreq_get_cpu_power(unsigned long *mW,
+				     unsigned long *KHz, struct device *cpu_dev)
+{
+	struct cpufreq_mtk *c = mtk_freq_domain_map[cpu_dev->id];
+	int i;
+
+	for (i = 0; i < c->nr_opp; i++) {
+		if (c->table[i].frequency < *KHz)
+			break;
+	}
+	i--;
+
+	*KHz = c->table[i].frequency;
+	*mW = readl_relaxed(c->reg_bases[REG_EM_POWER_TBL] +
+			    i * LUT_ROW_SIZE) / 1000;
+
+	return 0;
+}
+
 static int mtk_cpufreq_hw_target_index(struct cpufreq_policy *policy,
 				       unsigned int index)
 {
 	struct cpufreq_mtk *c = policy->driver_data;
 
-	writel_relaxed(index, c->reg_bases[REG_PERF_STATE]);
+	writel_relaxed(index, c->reg_bases[REG_FREQ_PERF_STATE]);
 
 	return 0;
 }
@@ -55,7 +78,7 @@ static unsigned int mtk_cpufreq_hw_get(unsigned int cpu)
 
 	c = mtk_freq_domain_map[cpu];
 
-	index = readl_relaxed(c->reg_bases[REG_PERF_STATE]);
+	index = readl_relaxed(c->reg_bases[REG_FREQ_PERF_STATE]);
 	index = min(index, LUT_MAX_ENTRIES - 1);
 
 	return c->table[index].frequency;
@@ -64,6 +87,14 @@ static unsigned int mtk_cpufreq_hw_get(unsigned int cpu)
 static int mtk_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
 {
 	struct cpufreq_mtk *c;
+	struct device *cpu_dev;
+	struct em_data_callback em_cb = EM_DATA_CB(mtk_cpufreq_get_cpu_power);
+
+	cpu_dev = get_cpu_device(policy->cpu);
+	if (!cpu_dev) {
+		pr_err("failed to get cpu%d device\n", policy->cpu);
+		return -ENODEV;
+	}
 
 	c = mtk_freq_domain_map[policy->cpu];
 	if (!c) {
@@ -77,7 +108,9 @@ static int mtk_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
 	policy->driver_data = c;
 
 	/* HW should be in enabled state to proceed now */
-	writel_relaxed(0x1, c->reg_bases[REG_ENABLE]);
+	writel_relaxed(0x1, c->reg_bases[REG_FREQ_ENABLE]);
+
+	em_dev_register_perf_domain(cpu_dev, c->nr_opp, &em_cb, policy->cpus);
 
 	return 0;
 }
@@ -93,7 +126,7 @@ static int mtk_cpufreq_hw_cpu_exit(struct cpufreq_policy *policy)
 	}
 
 	/* HW should be in paused state now */
-	writel_relaxed(0x0, c->reg_bases[REG_ENABLE]);
+	writel_relaxed(0x0, c->reg_bases[REG_FREQ_ENABLE]);
 
 	return 0;
 }
@@ -122,7 +155,7 @@ static int mtk_cpu_create_freq_table(struct platform_device *pdev,
 	if (!c->table)
 		return -ENOMEM;
 
-	base_table = c->reg_bases[REG_LUT_TABLE];
+	base_table = c->reg_bases[REG_FREQ_LUT_TABLE];
 
 	for (i = 0; i < LUT_MAX_ENTRIES; i++) {
 		data = readl_relaxed(base_table + (i * LUT_ROW_SIZE));
@@ -140,6 +173,7 @@ static int mtk_cpu_create_freq_table(struct platform_device *pdev,
 	}
 
 	c->table[i].frequency = CPUFREQ_TABLE_END;
+	c->nr_opp = i;
 
 	return 0;
 }
@@ -192,7 +226,7 @@ static int mtk_cpu_resources_init(struct platform_device *pdev,
 	if (IS_ERR(base))
 		return PTR_ERR(base);
 
-	for (i = REG_LUT_TABLE; i < REG_ARRAY_SIZE; i++)
+	for (i = REG_FREQ_LUT_TABLE; i < REG_ARRAY_SIZE; i++)
 		c->reg_bases[i] = base + offsets[i];
 
 	ret = mtk_get_related_cpus(index, c);
-- 
1.7.9.5
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