[PATCH 2/2] cpufreq: qcom-nvmem: add support for IPQ8064

[Robert Marko]

From: Christian Marangi <ansuelsmth@xxxxxxxxx>

IPQ8064 comes in 3 families:
* IPQ8062 up to 1.0GHz
* IPQ8064/IPQ8066/IPQ8068 up to 1.4GHz
* IPQ8065/IPQ8069 up to 1.7Ghz

So, in order to be able to share one OPP table, add support for
IPQ8064 family based of SMEM SoC ID-s as speedbin fuse is always 0 on
IPQ8064.

Bit are set with the following logic:
* IPQ8062 BIT 0
* IPQ8064/IPQ8066/IPQ8068 BIT 1
* IPQ8065/IPQ8069 BIT 2

speed is never fused, only psv values are fused.
Set speed to the versions to permit a unified opp table following
this named opp:

opp-microvolt-speed<SPEED_VALUE>-pvs<PSV_VALUE>-v0

Example:
- for ipq8062 psv2
  opp-microvolt-speed0-pvs2-v0 = < 925000 878750 971250>
- for ipq8064 psv2
  opp-microvolt-speed2-pvs2-v0 = <925000 878750 971250>;
- for ipq8065 psv2
  opp-microvolt-speed4-pvs2-v0 = <950000 902500 997500>;

Signed-off-by: Christian Marangi <ansuelsmth@xxxxxxxxx>
Signed-off-by: Robert Marko <robimarko@xxxxxxxxx>
---
 drivers/cpufreq/qcom-cpufreq-nvmem.c | 73 +++++++++++++++++++++++++++-
 1 file changed, 72 insertions(+), 1 deletion(-)

diff --git a/drivers/cpufreq/qcom-cpufreq-nvmem.c b/drivers/cpufreq/qcom-cpufreq-nvmem.c
index ce444b5962f2..c644138680ba 100644
--- a/drivers/cpufreq/qcom-cpufreq-nvmem.c
+++ b/drivers/cpufreq/qcom-cpufreq-nvmem.c
@@ -34,6 +34,10 @@
 #define IPQ8074_HAWKEYE_VERSION		BIT(0)
 #define IPQ8074_ACORN_VERSION		BIT(1)
 
+#define IPQ8062_VERSION		BIT(0)
+#define IPQ8064_VERSION		BIT(1)
+#define IPQ8065_VERSION		BIT(2)
+
 struct qcom_cpufreq_drv;
 
 struct qcom_cpufreq_match_data {
@@ -207,6 +211,69 @@ static int qcom_cpufreq_krait_name_version(struct device *cpu_dev,
 	return ret;
 }
 
+static int qcom_cpufreq_ipq8064_name_version(struct device *cpu_dev,
+					     struct nvmem_cell *speedbin_nvmem,
+					     char **pvs_name,
+					     struct qcom_cpufreq_drv *drv)
+{
+	int speed = 0, pvs = 0, pvs_ver = 0;
+	int msm_id, ret = 0;
+	u8 *speedbin;
+	size_t len;
+
+	speedbin = nvmem_cell_read(speedbin_nvmem, &len);
+
+	if (IS_ERR(speedbin))
+		return PTR_ERR(speedbin);
+
+	switch (len) {
+	case 4:
+		get_krait_bin_format_a(cpu_dev, &speed, &pvs, &pvs_ver,
+				       speedbin);
+		break;
+	default:
+		dev_err(cpu_dev, "Unable to read nvmem data. Defaulting to 0!\n");
+		ret = -ENODEV;
+		goto len_error;
+	}
+
+	ret = qcom_smem_get_soc_id(&msm_id);
+	if (ret)
+		return ret;
+
+	switch (msm_id) {
+	case QCOM_ID_IPQ8062:
+		drv->versions = IPQ8062_VERSION;
+		break;
+	case QCOM_ID_IPQ8064:
+	case QCOM_ID_IPQ8066:
+	case QCOM_ID_IPQ8068:
+		drv->versions = IPQ8064_VERSION;
+		break;
+	case QCOM_ID_IPQ8065:
+	case QCOM_ID_IPQ8069:
+		drv->versions = IPQ8065_VERSION;
+		break;
+	default:
+		dev_err(cpu_dev,
+			"SoC ID %u is not part of IPQ8064 family, limiting to 1.0GHz!\n",
+			msm_id);
+		drv->versions = IPQ8062_VERSION;
+		break;
+	}
+
+	/*
+	 * IPQ8064 speed is never fused. Only psv values are fused.
+	 * Set speed to the versions to permit a unified opp table.
+	 */
+	snprintf(*pvs_name, sizeof("speedXX-pvsXX-vXX"), "speed%d-pvs%d-v%d",
+		 drv->versions, pvs, pvs_ver);
+
+len_error:
+	kfree(speedbin);
+	return ret;
+}
+
 static int qcom_cpufreq_ipq8074_name_version(struct device *cpu_dev,
 					     struct nvmem_cell *speedbin_nvmem,
 					     char **pvs_name,
@@ -256,6 +323,10 @@ static const struct qcom_cpufreq_match_data match_data_qcs404 = {
 	.genpd_names = qcs404_genpd_names,
 };
 
+static const struct qcom_cpufreq_match_data match_data_ipq8064 = {
+	.get_version = qcom_cpufreq_ipq8064_name_version,
+};
+
 static const struct qcom_cpufreq_match_data match_data_ipq8074 = {
 	.get_version = qcom_cpufreq_ipq8074_name_version,
 };
@@ -404,7 +475,7 @@ static const struct of_device_id qcom_cpufreq_match_list[] __initconst = {
 	{ .compatible = "qcom,apq8096", .data = &match_data_kryo },
 	{ .compatible = "qcom,msm8996", .data = &match_data_kryo },
 	{ .compatible = "qcom,qcs404", .data = &match_data_qcs404 },
-	{ .compatible = "qcom,ipq8064", .data = &match_data_krait },
+	{ .compatible = "qcom,ipq8064", .data = &match_data_ipq8064 },
 	{ .compatible = "qcom,ipq8074", .data = &match_data_ipq8074 },
 	{ .compatible = "qcom,apq8064", .data = &match_data_krait },
 	{ .compatible = "qcom,msm8974", .data = &match_data_krait },
-- 
2.40.1