--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Allwinner CPUFreq nvmem based driver
+ *
+ * The sun50i-cpufreq-nvmem driver reads the efuse value from the SoC to
+ * provide the OPP framework with required information.
+ *
+ * Copyright (C) 2019 Yangtao Li <tiny.windzz@gmail.com>
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/nvmem-consumer.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_opp.h>
+#include <linux/slab.h>
+
+#define MAX_NAME_LEN 7
+
+#define NVMEM_MASK 0x7
+#define NVMEM_SHIFT 5
+
+static struct platform_device *cpufreq_dt_pdev, *sun50i_cpufreq_pdev;
+
+/**
+ * sun50i_cpufreq_get_efuse() - Parse and return efuse value present on SoC
+ * @versions: Set to the value parsed from efuse
+ *
+ * Returns 0 if success.
+ */
+static int sun50i_cpufreq_get_efuse(u32 *versions)
+{
+ struct nvmem_cell *speedbin_nvmem;
+ struct device_node *np;
+ struct device *cpu_dev;
+ u32 *speedbin, efuse_value;
+ size_t len;
+ int ret;
+
+ 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;
+
+ ret = of_device_is_compatible(np,
+ "allwinner,sun50i-h6-operating-points");
+ if (!ret) {
+ of_node_put(np);
+ return -ENOENT;
+ }
+
+ speedbin_nvmem = of_nvmem_cell_get(np, NULL);
+ of_node_put(np);
+ if (IS_ERR(speedbin_nvmem)) {
+ if (PTR_ERR(speedbin_nvmem) != -EPROBE_DEFER)
+ pr_err("Could not get nvmem cell: %ld\n",
+ PTR_ERR(speedbin_nvmem));
+ return PTR_ERR(speedbin_nvmem);
+ }
+
+ speedbin = nvmem_cell_read(speedbin_nvmem, &len);
+ nvmem_cell_put(speedbin_nvmem);
+ if (IS_ERR(speedbin))
+ return PTR_ERR(speedbin);
+
+ efuse_value = (*speedbin >> NVMEM_SHIFT) & NVMEM_MASK;
+ switch (efuse_value) {
+ case 0b0001:
+ *versions = 1;
+ break;
+ case 0b0011:
+ *versions = 2;
+ break;
+ default:
+ /*
+ * For other situations, we treat it as bin0.
+ * This vf table can be run for any good cpu.
+ */
+ *versions = 0;
+ break;
+ }
+
+ kfree(speedbin);
+ return 0;
+};
+
+static int sun50i_cpufreq_nvmem_probe(struct platform_device *pdev)
+{
+ struct opp_table **opp_tables;
+ char name[MAX_NAME_LEN];
+ unsigned int cpu;
+ u32 speed = 0;
+ int ret;
+
+ opp_tables = kcalloc(num_possible_cpus(), sizeof(*opp_tables),
+ GFP_KERNEL);
+ if (!opp_tables)
+ return -ENOMEM;
+
+ ret = sun50i_cpufreq_get_efuse(&speed);
+ if (ret)
+ return ret;
+
+ snprintf(name, MAX_NAME_LEN, "speed%d", speed);
+
+ for_each_possible_cpu(cpu) {
+ struct device *cpu_dev = get_cpu_device(cpu);
+
+ if (!cpu_dev) {
+ ret = -ENODEV;
+ goto free_opp;
+ }
+
+ opp_tables[cpu] = dev_pm_opp_set_prop_name(cpu_dev, name);
+ if (IS_ERR(opp_tables[cpu])) {
+ ret = PTR_ERR(opp_tables[cpu]);
+ pr_err("Failed to set prop name\n");
+ goto free_opp;
+ }
+ }
+
+ cpufreq_dt_pdev = platform_device_register_simple("cpufreq-dt", -1,
+ NULL, 0);
+ if (!IS_ERR(cpufreq_dt_pdev)) {
+ platform_set_drvdata(pdev, opp_tables);
+ return 0;
+ }
+
+ ret = PTR_ERR(cpufreq_dt_pdev);
+ pr_err("Failed to register platform device\n");
+
+free_opp:
+ for_each_possible_cpu(cpu) {
+ if (IS_ERR_OR_NULL(opp_tables[cpu]))
+ break;
+ dev_pm_opp_put_prop_name(opp_tables[cpu]);
+ }
+ kfree(opp_tables);
+
+ return ret;
+}
+
+static int sun50i_cpufreq_nvmem_remove(struct platform_device *pdev)
+{
+ struct opp_table **opp_tables = platform_get_drvdata(pdev);
+ unsigned int cpu;
+
+ platform_device_unregister(cpufreq_dt_pdev);
+
+ for_each_possible_cpu(cpu)
+ dev_pm_opp_put_prop_name(opp_tables[cpu]);
+
+ kfree(opp_tables);
+
+ return 0;
+}
+
+static struct platform_driver sun50i_cpufreq_driver = {
+ .probe = sun50i_cpufreq_nvmem_probe,
+ .remove = sun50i_cpufreq_nvmem_remove,
+ .driver = {
+ .name = "sun50i-cpufreq-nvmem",
+ },
+};
+
+static const struct of_device_id sun50i_cpufreq_match_list[] = {
+ { .compatible = "allwinner,sun50i-h6" },
+ {}
+};
+
+static const struct of_device_id *sun50i_cpufreq_match_node(void)
+{
+ const struct of_device_id *match;
+ struct device_node *np;
+
+ np = of_find_node_by_path("/");
+ match = of_match_node(sun50i_cpufreq_match_list, np);
+ of_node_put(np);
+
+ return match;
+}
+
+/*
+ * Since the driver depends on nvmem drivers, which may return EPROBE_DEFER,
+ * all the real activity is done in the probe, which may be defered as well.
+ * The init here is only registering the driver and the platform device.
+ */
+static int __init sun50i_cpufreq_init(void)
+{
+ const struct of_device_id *match;
+ int ret;
+
+ match = sun50i_cpufreq_match_node();
+ if (!match)
+ return -ENODEV;
+
+ ret = platform_driver_register(&sun50i_cpufreq_driver);
+ if (unlikely(ret < 0))
+ return ret;
+
+ sun50i_cpufreq_pdev =
+ platform_device_register_simple("sun50i-cpufreq-nvmem",
+ -1, NULL, 0);
+ ret = PTR_ERR_OR_ZERO(sun50i_cpufreq_pdev);
+ if (ret == 0)
+ return 0;
+
+ platform_driver_unregister(&sun50i_cpufreq_driver);
+ return ret;
+}
+module_init(sun50i_cpufreq_init);
+
+static void __exit sun50i_cpufreq_exit(void)
+{
+ platform_device_unregister(sun50i_cpufreq_pdev);
+ platform_driver_unregister(&sun50i_cpufreq_driver);
+}
+module_exit(sun50i_cpufreq_exit);
+
+MODULE_DESCRIPTION("Sun50i-h6 cpufreq driver");
+MODULE_LICENSE("GPL v2");
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