[PATCH v9 14/15] cpufreq: Add module to register cpufreq on Krait CPUs

[Sricharan R <sricharan@codeaurora.org>]

From: Stephen Boyd <sboyd@codeaurora.org>

Register a cpufreq-generic device whenever we detect that a
"qcom,krait" compatible CPU is present in DT.

Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
[Sricharan: updated to use dev_pm_opp_set_prop_name and
	    nvmem apis]
Signed-off-by: Sricharan R <sricharan@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
---
 drivers/cpufreq/Kconfig.arm          |  10 ++
 drivers/cpufreq/Makefile             |   1 +
 drivers/cpufreq/cpufreq-dt-platdev.c |   5 +
 drivers/cpufreq/qcom-cpufreq.c       | 183 +++++++++++++++++++++++++++++++++++
 4 files changed, 199 insertions(+)
 create mode 100644 drivers/cpufreq/qcom-cpufreq.c

diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
index 3a88e33..826f9e7 100644
--- a/drivers/cpufreq/Kconfig.arm
+++ b/drivers/cpufreq/Kconfig.arm
@@ -133,6 +133,16 @@ config ARM_OMAP2PLUS_CPUFREQ
 	depends on ARCH_OMAP2PLUS
 	default ARCH_OMAP2PLUS
 
+config ARM_QCOM_CPUFREQ
+	bool "CPUfreq driver for the QCOM SoCs with KRAIT processors"
+	depends on ARCH_QCOM
+	select PM_OPP
+	help
+	  This enables the CPUFreq driver for Qualcomm SoCs with
+	  KRAIT processors.
+
+	  If in doubt, say N.
+
 config ARM_S3C_CPUFREQ
 	bool
 	help
diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
index c60c1e1..1ca3390 100644
--- a/drivers/cpufreq/Makefile
+++ b/drivers/cpufreq/Makefile
@@ -65,6 +65,7 @@ obj-$(CONFIG_MACH_MVEBU_V7)		+= mvebu-cpufreq.o
 obj-$(CONFIG_ARM_OMAP2PLUS_CPUFREQ)	+= omap-cpufreq.o
 obj-$(CONFIG_ARM_PXA2xx_CPUFREQ)	+= pxa2xx-cpufreq.o
 obj-$(CONFIG_PXA3xx)			+= pxa3xx-cpufreq.o
+obj-$(CONFIG_ARM_QCOM_CPUFREQ)		+= qcom-cpufreq.o
 obj-$(CONFIG_ARM_S3C2410_CPUFREQ)	+= s3c2410-cpufreq.o
 obj-$(CONFIG_ARM_S3C2412_CPUFREQ)	+= s3c2412-cpufreq.o
 obj-$(CONFIG_ARM_S3C2416_CPUFREQ)	+= s3c2416-cpufreq.o
diff --git a/drivers/cpufreq/cpufreq-dt-platdev.c b/drivers/cpufreq/cpufreq-dt-platdev.c
index 3b585e4..e2e9a99 100644
--- a/drivers/cpufreq/cpufreq-dt-platdev.c
+++ b/drivers/cpufreq/cpufreq-dt-platdev.c
@@ -127,6 +127,11 @@
 	{ .compatible = "ti,am43", },
 	{ .compatible = "ti,dra7", },
 
+	{ .compatible = "qcom,ipq8064", },
+	{ .compatible = "qcom,apq8064", },
+	{ .compatible = "qcom,msm8974", },
+	{ .compatible = "qcom,msm8960", },
+
 	{ }
 };
 
diff --git a/drivers/cpufreq/qcom-cpufreq.c b/drivers/cpufreq/qcom-cpufreq.c
new file mode 100644
index 0000000..6d71a3c
--- /dev/null
+++ b/drivers/cpufreq/qcom-cpufreq.c
@@ -0,0 +1,183 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2018, The Linux Foundation. All rights reserved.
+
+#include <linux/cpu.h>
+#include <linux/module.h>
+#include <linux/nvmem-consumer.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/pm_opp.h>
+#include <linux/slab.h>
+
+static void __init get_krait_bin_format_a(int *speed, int *pvs, int *pvs_ver,
+					  struct nvmem_cell *pvs_nvmem, u8 *buf)
+{
+	u32 pte_efuse;
+
+	pte_efuse = *((u32 *)buf);
+
+	*speed = pte_efuse & 0xf;
+	if (*speed == 0xf)
+		*speed = (pte_efuse >> 4) & 0xf;
+
+	if (*speed == 0xf) {
+		*speed = 0;
+		pr_warn("Speed bin: Defaulting to %d\n", *speed);
+	} else {
+		pr_info("Speed bin: %d\n", *speed);
+	}
+
+	*pvs = (pte_efuse >> 10) & 0x7;
+	if (*pvs == 0x7)
+		*pvs = (pte_efuse >> 13) & 0x7;
+
+	if (*pvs == 0x7) {
+		*pvs = 0;
+		pr_warn("PVS bin: Defaulting to %d\n", *pvs);
+	} else {
+		pr_info("PVS bin: %d\n", *pvs);
+	}
+
+	kfree(buf);
+}
+
+static void __init get_krait_bin_format_b(int *speed, int *pvs, int *pvs_ver,
+					  struct nvmem_cell *pvs_nvmem, u8 *buf)
+{
+	u32 pte_efuse, redundant_sel;
+
+	pte_efuse = *((u32 *)buf);
+	redundant_sel = (pte_efuse >> 24) & 0x7;
+	*speed = pte_efuse & 0x7;
+
+	/* 4 bits of PVS are in efuse register bits 31, 8-6. */
+	*pvs = ((pte_efuse >> 28) & 0x8) | ((pte_efuse >> 6) & 0x7);
+	*pvs_ver = (pte_efuse >> 4) & 0x3;
+
+	switch (redundant_sel) {
+	case 1:
+		*speed = (pte_efuse >> 27) & 0xf;
+		break;
+	case 2:
+		*pvs = (pte_efuse >> 27) & 0xf;
+		break;
+	}
+
+	/* Check SPEED_BIN_BLOW_STATUS */
+	if (pte_efuse & BIT(3)) {
+		pr_info("Speed bin: %d\n", *speed);
+	} else {
+		pr_warn("Speed bin not set. Defaulting to 0!\n");
+		*speed = 0;
+	}
+
+	/* Check PVS_BLOW_STATUS */
+	pte_efuse = *(((u32 *)buf) + 4);
+	if (pte_efuse) {
+		pr_info("PVS bin: %d\n", *pvs);
+	} else {
+		pr_warn("PVS bin not set. Defaulting to 0!\n");
+		*pvs = 0;
+	}
+
+	pr_info("PVS version: %d\n", *pvs_ver);
+	kfree(buf);
+}
+
+static int __init qcom_cpufreq_populate_opps(struct nvmem_cell *pvs_nvmem,
+					     struct opp_table **tbl)
+{
+	int speed = 0, pvs = 0, pvs_ver = 0, cpu, ret;
+	struct device *cpu_dev;
+	u8 *buf;
+	size_t len;
+	char pvs_name[] = "speedXX-pvsXX-vXX";
+
+	buf = nvmem_cell_read(pvs_nvmem, &len);
+	if (len == 4)
+		get_krait_bin_format_a(&speed, &pvs, &pvs_ver, pvs_nvmem, buf);
+	else if (len == 8)
+		get_krait_bin_format_b(&speed, &pvs, &pvs_ver, pvs_nvmem, buf);
+	else
+		pr_warn("Unable to read nvmem data. Defaulting to 0!\n");
+
+	snprintf(pvs_name, sizeof(pvs_name), "speed%d-pvs%d-v%d",
+		 speed, pvs, pvs_ver);
+
+	for (cpu = 0; cpu < num_possible_cpus(); cpu++) {
+		cpu_dev = get_cpu_device(cpu);
+		if (!cpu_dev)
+			return -ENODEV;
+
+		tbl[cpu] = dev_pm_opp_set_prop_name(cpu_dev, pvs_name);
+
+		if (IS_ERR(tbl[cpu])) {
+			ret = PTR_ERR(tbl[cpu]);
+			tbl[cpu] = 0;
+			pr_warn("failed to add OPP name %s\n", pvs_name);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+
+static int __init qcom_cpufreq_driver_init(void)
+{
+	struct platform_device *pdev;
+	struct device *cpu_dev;
+	struct device_node *np;
+	struct nvmem_cell *pvs_nvmem;
+	struct opp_table *tbl[NR_CPUS] = { NULL };
+	int ret, cpu = 0;
+
+	cpu_dev = get_cpu_device(0);
+	if (!cpu_dev)
+		return -ENODEV;
+
+	np = dev_pm_opp_of_get_opp_desc_node(cpu_dev);
+	if (!np)
+		return -ENOENT;
+
+	if (!of_device_is_compatible(np, "operating-points-v2-krait-cpu")) {
+		ret = -ENOENT;
+		goto free_np;
+	}
+
+	pvs_nvmem = of_nvmem_cell_get(np, NULL);
+	if (IS_ERR(pvs_nvmem)) {
+		dev_err(cpu_dev, "Could not get nvmem cell\n");
+		ret = PTR_ERR(pvs_nvmem);
+		goto free_np;
+	}
+
+	ret = qcom_cpufreq_populate_opps(pvs_nvmem, tbl);
+	if (ret)
+		goto free_opp_name;
+
+	pdev = platform_device_register_simple("cpufreq-dt", -1, NULL, 0);
+	if (IS_ERR(pdev)) {
+		ret = PTR_ERR(pdev);
+		goto free_opp_name;
+	}
+
+	of_node_put(np);
+
+	return 0;
+
+free_opp_name:
+	while (tbl[cpu]) {
+		dev_pm_opp_put_prop_name(tbl[cpu]);
+		cpu++;
+	}
+
+free_np:
+	of_node_put(np);
+
+	return ret;
+}
+late_initcall(qcom_cpufreq_driver_init);
+
+MODULE_DESCRIPTION("Qualcomm CPUfreq driver");
+MODULE_AUTHOR("Stephen Boyd <sboyd@codeaurora.org>");
+MODULE_LICENSE("GPL v2");
-- 
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