^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * Allwinner CPUFreq nvmem based driver
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * The sun50i-cpufreq-nvmem driver reads the efuse value from the SoC to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * provide the OPP framework with required information.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Copyright (C) 2019 Yangtao Li <tiny.windzz@gmail.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) #include <linux/nvmem-consumer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) #include <linux/of_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) #include <linux/platform_device.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #include <linux/pm_opp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) #include <linux/slab.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #define MAX_NAME_LEN 7
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #define NVMEM_MASK 0x7
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #define NVMEM_SHIFT 5
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) static struct platform_device *cpufreq_dt_pdev, *sun50i_cpufreq_pdev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * sun50i_cpufreq_get_efuse() - Determine speed grade from efuse value
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * @versions: Set to the value parsed from efuse
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * Returns 0 if success.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) static int sun50i_cpufreq_get_efuse(u32 *versions)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) struct nvmem_cell *speedbin_nvmem;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) struct device_node *np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) struct device *cpu_dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) u32 *speedbin, efuse_value;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) size_t len;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) cpu_dev = get_cpu_device(0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) if (!cpu_dev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) np = dev_pm_opp_of_get_opp_desc_node(cpu_dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) if (!np)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) ret = of_device_is_compatible(np,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) "allwinner,sun50i-h6-operating-points");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) if (!ret) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) of_node_put(np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) return -ENOENT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) speedbin_nvmem = of_nvmem_cell_get(np, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) of_node_put(np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) if (IS_ERR(speedbin_nvmem)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) if (PTR_ERR(speedbin_nvmem) != -EPROBE_DEFER)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) pr_err("Could not get nvmem cell: %ld\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) PTR_ERR(speedbin_nvmem));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) return PTR_ERR(speedbin_nvmem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) speedbin = nvmem_cell_read(speedbin_nvmem, &len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) nvmem_cell_put(speedbin_nvmem);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) if (IS_ERR(speedbin))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) return PTR_ERR(speedbin);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) efuse_value = (*speedbin >> NVMEM_SHIFT) & NVMEM_MASK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) * We treat unexpected efuse values as if the SoC was from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * the slowest bin. Expected efuse values are 1-3, slowest
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * to fastest.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) if (efuse_value >= 1 && efuse_value <= 3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) *versions = efuse_value - 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) *versions = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) kfree(speedbin);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) static int sun50i_cpufreq_nvmem_probe(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) struct opp_table **opp_tables;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) char name[MAX_NAME_LEN];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) unsigned int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) u32 speed = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) opp_tables = kcalloc(num_possible_cpus(), sizeof(*opp_tables),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) GFP_KERNEL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) if (!opp_tables)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) ret = sun50i_cpufreq_get_efuse(&speed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) if (ret)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) snprintf(name, MAX_NAME_LEN, "speed%d", speed);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) for_each_possible_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) struct device *cpu_dev = get_cpu_device(cpu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) if (!cpu_dev) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) ret = -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) goto free_opp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) opp_tables[cpu] = dev_pm_opp_set_prop_name(cpu_dev, name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) if (IS_ERR(opp_tables[cpu])) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) ret = PTR_ERR(opp_tables[cpu]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) pr_err("Failed to set prop name\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) goto free_opp;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) cpufreq_dt_pdev = platform_device_register_simple("cpufreq-dt", -1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) if (!IS_ERR(cpufreq_dt_pdev)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) platform_set_drvdata(pdev, opp_tables);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) ret = PTR_ERR(cpufreq_dt_pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) pr_err("Failed to register platform device\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) free_opp:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) for_each_possible_cpu(cpu) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) if (IS_ERR_OR_NULL(opp_tables[cpu]))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) break;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) dev_pm_opp_put_prop_name(opp_tables[cpu]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) kfree(opp_tables);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) static int sun50i_cpufreq_nvmem_remove(struct platform_device *pdev)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) struct opp_table **opp_tables = platform_get_drvdata(pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) unsigned int cpu;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) platform_device_unregister(cpufreq_dt_pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) for_each_possible_cpu(cpu)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) dev_pm_opp_put_prop_name(opp_tables[cpu]);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) kfree(opp_tables);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) static struct platform_driver sun50i_cpufreq_driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) .probe = sun50i_cpufreq_nvmem_probe,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) .remove = sun50i_cpufreq_nvmem_remove,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) .driver = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) .name = "sun50i-cpufreq-nvmem",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) static const struct of_device_id sun50i_cpufreq_match_list[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) { .compatible = "allwinner,sun50i-h6" },
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) {}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) MODULE_DEVICE_TABLE(of, sun50i_cpufreq_match_list);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) static const struct of_device_id *sun50i_cpufreq_match_node(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) const struct of_device_id *match;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) struct device_node *np;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) np = of_find_node_by_path("/");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) match = of_match_node(sun50i_cpufreq_match_list, np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) of_node_put(np);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) return match;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) * Since the driver depends on nvmem drivers, which may return EPROBE_DEFER,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) * all the real activity is done in the probe, which may be defered as well.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) * The init here is only registering the driver and the platform device.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) static int __init sun50i_cpufreq_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) const struct of_device_id *match;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) match = sun50i_cpufreq_match_node();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) if (!match)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) return -ENODEV;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) ret = platform_driver_register(&sun50i_cpufreq_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) if (unlikely(ret < 0))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) sun50i_cpufreq_pdev =
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) platform_device_register_simple("sun50i-cpufreq-nvmem",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) -1, NULL, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) ret = PTR_ERR_OR_ZERO(sun50i_cpufreq_pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) if (ret == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) platform_driver_unregister(&sun50i_cpufreq_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) module_init(sun50i_cpufreq_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) static void __exit sun50i_cpufreq_exit(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) platform_device_unregister(sun50i_cpufreq_pdev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) platform_driver_unregister(&sun50i_cpufreq_driver);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) module_exit(sun50i_cpufreq_exit);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) MODULE_DESCRIPTION("Sun50i-h6 cpufreq driver");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) MODULE_LICENSE("GPL v2");
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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