[PATCH 1/3] cpufreq: qcom-hw: Allocate qcom_cpufreq_data during probe

[Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>]

qcom_cpufreq_data is allocated based on the number of frequency domains
defined in DT which is static and won't change during runtime. There is
no real reason to allocate it during the CPU init() callback and deallocate
it during exit(). Hence, move the allocation to probe() and use the
allocated memory during init().

This also allows us to use devm_platform_get_and_ioremap_resource() helper
for acquiring the freq-domain resources from DT.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
---
 drivers/cpufreq/qcom-cpufreq-hw.c | 86 +++++++++++++------------------
 1 file changed, 37 insertions(+), 49 deletions(-)

diff --git a/drivers/cpufreq/qcom-cpufreq-hw.c b/drivers/cpufreq/qcom-cpufreq-hw.c
index a5b3b8d0e164..1842e9facaa1 100644
--- a/drivers/cpufreq/qcom-cpufreq-hw.c
+++ b/drivers/cpufreq/qcom-cpufreq-hw.c
@@ -58,6 +58,10 @@ struct qcom_cpufreq_data {
 	bool per_core_dcvs;
 };
 
+static struct {
+	struct qcom_cpufreq_data *data;
+} qcom_cpufreq;
+
 static unsigned long cpu_hw_rate, xo_rate;
 static bool icc_scaling_enabled;
 
@@ -489,8 +493,6 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
 	struct of_phandle_args args;
 	struct device_node *cpu_np;
 	struct device *cpu_dev;
-	struct resource *res;
-	void __iomem *base;
 	struct qcom_cpufreq_data *data;
 	int ret, index;
 
@@ -512,43 +514,16 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
 		return ret;
 
 	index = args.args[0];
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, index);
-	if (!res) {
-		dev_err(dev, "failed to get mem resource %d\n", index);
-		return -ENODEV;
-	}
-
-	if (!request_mem_region(res->start, resource_size(res), res->name)) {
-		dev_err(dev, "failed to request resource %pR\n", res);
-		return -EBUSY;
-	}
-
-	base = ioremap(res->start, resource_size(res));
-	if (!base) {
-		dev_err(dev, "failed to map resource %pR\n", res);
-		ret = -ENOMEM;
-		goto release_region;
-	}
-
-	data = kzalloc(sizeof(*data), GFP_KERNEL);
-	if (!data) {
-		ret = -ENOMEM;
-		goto unmap_base;
-	}
-
 	data->soc_data = of_device_get_match_data(&pdev->dev);
-	data->base = base;
-	data->res = res;
+	data = &qcom_cpufreq.data[index];
 
 	/* HW should be in enabled state to proceed */
-	if (!(readl_relaxed(base + data->soc_data->reg_enable) & 0x1)) {
+	if (!(readl_relaxed(data->base + data->soc_data->reg_enable) & 0x1)) {
 		dev_err(dev, "Domain-%d cpufreq hardware not enabled\n", index);
-		ret = -ENODEV;
-		goto error;
+		return -ENODEV;
 	}
 
-	if (readl_relaxed(base + data->soc_data->reg_dcvs_ctrl) & 0x1)
+	if (readl_relaxed(data->base + data->soc_data->reg_dcvs_ctrl) & 0x1)
 		data->per_core_dcvs = true;
 
 	qcom_get_related_cpus(index, policy->cpus);
@@ -559,14 +534,13 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
 	ret = qcom_cpufreq_hw_read_lut(cpu_dev, policy);
 	if (ret) {
 		dev_err(dev, "Domain-%d failed to read LUT\n", index);
-		goto error;
+		return ret;
 	}
 
 	ret = dev_pm_opp_get_opp_count(cpu_dev);
 	if (ret <= 0) {
 		dev_err(cpu_dev, "Failed to add OPPs\n");
-		ret = -ENODEV;
-		goto error;
+		return -ENODEV;
 	}
 
 	if (policy_has_boost_freq(policy)) {
@@ -575,18 +549,7 @@ static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy)
 			dev_warn(cpu_dev, "failed to enable boost: %d\n", ret);
 	}
 
-	ret = qcom_cpufreq_hw_lmh_init(policy, index);
-	if (ret)
-		goto error;
-
-	return 0;
-error:
-	kfree(data);
-unmap_base:
-	iounmap(base);
-release_region:
-	release_mem_region(res->start, resource_size(res));
-	return ret;
+	return qcom_cpufreq_hw_lmh_init(policy, index);
 }
 
 static int qcom_cpufreq_hw_cpu_exit(struct cpufreq_policy *policy)
@@ -643,7 +606,7 @@ static int qcom_cpufreq_hw_driver_probe(struct platform_device *pdev)
 {
 	struct device *cpu_dev;
 	struct clk *clk;
-	int ret;
+	int ret, i, num_domains;
 
 	clk = clk_get(&pdev->dev, "xo");
 	if (IS_ERR(clk))
@@ -670,6 +633,31 @@ static int qcom_cpufreq_hw_driver_probe(struct platform_device *pdev)
 	if (ret)
 		return ret;
 
+	/* Allocate qcom_cpufreq_data based on the available frequency domains in DT */
+	num_domains = of_property_count_elems_of_size(pdev->dev.of_node, "reg", sizeof(u32) * 4);
+	if (num_domains <= 0)
+		return num_domains;
+
+	qcom_cpufreq.data = devm_kzalloc(&pdev->dev, sizeof(struct qcom_cpufreq_data) * num_domains,
+					 GFP_KERNEL);
+	if (!qcom_cpufreq.data)
+		return -ENOMEM;
+
+	for (i = 0; i < num_domains; i++) {
+		struct qcom_cpufreq_data *data = &qcom_cpufreq.data[i];
+		struct resource *res;
+		void __iomem *base;
+
+		base = devm_platform_get_and_ioremap_resource(pdev, i, &res);
+		if (IS_ERR(base)) {
+			dev_err(&pdev->dev, "Failed to map resource %pR\n", res);
+			return PTR_ERR(base);
+		}
+
+		data->base = base;
+		data->res = res;
+	}
+
 	ret = cpufreq_register_driver(&cpufreq_qcom_hw_driver);
 	if (ret)
 		dev_err(&pdev->dev, "CPUFreq HW driver failed to register\n");
-- 
2.25.1