12849dd8bSTaniya Das // SPDX-License-Identifier: GPL-2.0 22849dd8bSTaniya Das /* 32849dd8bSTaniya Das * Copyright (c) 2018, The Linux Foundation. All rights reserved. 42849dd8bSTaniya Das */ 52849dd8bSTaniya Das 62849dd8bSTaniya Das #include <linux/bitfield.h> 72849dd8bSTaniya Das #include <linux/cpufreq.h> 82849dd8bSTaniya Das #include <linux/init.h> 92849dd8bSTaniya Das #include <linux/kernel.h> 102849dd8bSTaniya Das #include <linux/module.h> 112849dd8bSTaniya Das #include <linux/of_address.h> 122849dd8bSTaniya Das #include <linux/of_platform.h> 1355538fbcSTaniya Das #include <linux/pm_opp.h> 142849dd8bSTaniya Das #include <linux/slab.h> 152849dd8bSTaniya Das 162849dd8bSTaniya Das #define LUT_MAX_ENTRIES 40U 172849dd8bSTaniya Das #define LUT_SRC GENMASK(31, 30) 182849dd8bSTaniya Das #define LUT_L_VAL GENMASK(7, 0) 192849dd8bSTaniya Das #define LUT_CORE_COUNT GENMASK(18, 16) 2055538fbcSTaniya Das #define LUT_VOLT GENMASK(11, 0) 212849dd8bSTaniya Das #define LUT_ROW_SIZE 32 222849dd8bSTaniya Das #define CLK_HW_DIV 2 232849dd8bSTaniya Das 242849dd8bSTaniya Das /* Register offsets */ 252849dd8bSTaniya Das #define REG_ENABLE 0x0 2655538fbcSTaniya Das #define REG_FREQ_LUT 0x110 2755538fbcSTaniya Das #define REG_VOLT_LUT 0x114 282849dd8bSTaniya Das #define REG_PERF_STATE 0x920 292849dd8bSTaniya Das 302849dd8bSTaniya Das static unsigned long cpu_hw_rate, xo_rate; 312849dd8bSTaniya Das static struct platform_device *global_pdev; 322849dd8bSTaniya Das 332849dd8bSTaniya Das static int qcom_cpufreq_hw_target_index(struct cpufreq_policy *policy, 342849dd8bSTaniya Das unsigned int index) 352849dd8bSTaniya Das { 362849dd8bSTaniya Das void __iomem *perf_state_reg = policy->driver_data; 372849dd8bSTaniya Das 382849dd8bSTaniya Das writel_relaxed(index, perf_state_reg); 392849dd8bSTaniya Das 402849dd8bSTaniya Das return 0; 412849dd8bSTaniya Das } 422849dd8bSTaniya Das 432849dd8bSTaniya Das static unsigned int qcom_cpufreq_hw_get(unsigned int cpu) 442849dd8bSTaniya Das { 452849dd8bSTaniya Das void __iomem *perf_state_reg; 462849dd8bSTaniya Das struct cpufreq_policy *policy; 472849dd8bSTaniya Das unsigned int index; 482849dd8bSTaniya Das 492849dd8bSTaniya Das policy = cpufreq_cpu_get_raw(cpu); 502849dd8bSTaniya Das if (!policy) 512849dd8bSTaniya Das return 0; 522849dd8bSTaniya Das 532849dd8bSTaniya Das perf_state_reg = policy->driver_data; 542849dd8bSTaniya Das 552849dd8bSTaniya Das index = readl_relaxed(perf_state_reg); 562849dd8bSTaniya Das index = min(index, LUT_MAX_ENTRIES - 1); 572849dd8bSTaniya Das 582849dd8bSTaniya Das return policy->freq_table[index].frequency; 592849dd8bSTaniya Das } 602849dd8bSTaniya Das 612849dd8bSTaniya Das static unsigned int qcom_cpufreq_hw_fast_switch(struct cpufreq_policy *policy, 622849dd8bSTaniya Das unsigned int target_freq) 632849dd8bSTaniya Das { 642849dd8bSTaniya Das void __iomem *perf_state_reg = policy->driver_data; 652849dd8bSTaniya Das int index; 662849dd8bSTaniya Das 672849dd8bSTaniya Das index = policy->cached_resolved_idx; 682849dd8bSTaniya Das if (index < 0) 692849dd8bSTaniya Das return 0; 702849dd8bSTaniya Das 712849dd8bSTaniya Das writel_relaxed(index, perf_state_reg); 722849dd8bSTaniya Das 732849dd8bSTaniya Das return policy->freq_table[index].frequency; 742849dd8bSTaniya Das } 752849dd8bSTaniya Das 7655538fbcSTaniya Das static int qcom_cpufreq_hw_read_lut(struct device *cpu_dev, 772849dd8bSTaniya Das struct cpufreq_policy *policy, 782849dd8bSTaniya Das void __iomem *base) 792849dd8bSTaniya Das { 802849dd8bSTaniya Das u32 data, src, lval, i, core_count, prev_cc = 0, prev_freq = 0, freq; 8155538fbcSTaniya Das u32 volt; 822849dd8bSTaniya Das unsigned int max_cores = cpumask_weight(policy->cpus); 832849dd8bSTaniya Das struct cpufreq_frequency_table *table; 842849dd8bSTaniya Das 852849dd8bSTaniya Das table = kcalloc(LUT_MAX_ENTRIES + 1, sizeof(*table), GFP_KERNEL); 862849dd8bSTaniya Das if (!table) 872849dd8bSTaniya Das return -ENOMEM; 882849dd8bSTaniya Das 892849dd8bSTaniya Das for (i = 0; i < LUT_MAX_ENTRIES; i++) { 9055538fbcSTaniya Das data = readl_relaxed(base + REG_FREQ_LUT + 9155538fbcSTaniya Das i * LUT_ROW_SIZE); 922849dd8bSTaniya Das src = FIELD_GET(LUT_SRC, data); 932849dd8bSTaniya Das lval = FIELD_GET(LUT_L_VAL, data); 942849dd8bSTaniya Das core_count = FIELD_GET(LUT_CORE_COUNT, data); 952849dd8bSTaniya Das 9655538fbcSTaniya Das data = readl_relaxed(base + REG_VOLT_LUT + 9755538fbcSTaniya Das i * LUT_ROW_SIZE); 9855538fbcSTaniya Das volt = FIELD_GET(LUT_VOLT, data) * 1000; 9955538fbcSTaniya Das 1002849dd8bSTaniya Das if (src) 1012849dd8bSTaniya Das freq = xo_rate * lval / 1000; 1022849dd8bSTaniya Das else 1032849dd8bSTaniya Das freq = cpu_hw_rate / 1000; 1042849dd8bSTaniya Das 10555538fbcSTaniya Das if (freq != prev_freq && core_count == max_cores) { 1062849dd8bSTaniya Das table[i].frequency = freq; 10755538fbcSTaniya Das dev_pm_opp_add(cpu_dev, freq * 1000, volt); 10855538fbcSTaniya Das dev_dbg(cpu_dev, "index=%d freq=%d, core_count %d\n", i, 1092849dd8bSTaniya Das freq, core_count); 11055538fbcSTaniya Das } else { 11155538fbcSTaniya Das table[i].frequency = CPUFREQ_ENTRY_INVALID; 1122849dd8bSTaniya Das } 1132849dd8bSTaniya Das 1142849dd8bSTaniya Das /* 1152849dd8bSTaniya Das * Two of the same frequencies with the same core counts means 1162849dd8bSTaniya Das * end of table 1172849dd8bSTaniya Das */ 1182849dd8bSTaniya Das if (i > 0 && prev_freq == freq && prev_cc == core_count) { 1192849dd8bSTaniya Das struct cpufreq_frequency_table *prev = &table[i - 1]; 1202849dd8bSTaniya Das 1212849dd8bSTaniya Das /* 1222849dd8bSTaniya Das * Only treat the last frequency that might be a boost 1232849dd8bSTaniya Das * as the boost frequency 1242849dd8bSTaniya Das */ 1252849dd8bSTaniya Das if (prev_cc != max_cores) { 1262849dd8bSTaniya Das prev->frequency = prev_freq; 1272849dd8bSTaniya Das prev->flags = CPUFREQ_BOOST_FREQ; 12855538fbcSTaniya Das dev_pm_opp_add(cpu_dev, prev_freq * 1000, volt); 1292849dd8bSTaniya Das } 1302849dd8bSTaniya Das 1312849dd8bSTaniya Das break; 1322849dd8bSTaniya Das } 1332849dd8bSTaniya Das 1342849dd8bSTaniya Das prev_cc = core_count; 1352849dd8bSTaniya Das prev_freq = freq; 1362849dd8bSTaniya Das } 1372849dd8bSTaniya Das 1382849dd8bSTaniya Das table[i].frequency = CPUFREQ_TABLE_END; 1392849dd8bSTaniya Das policy->freq_table = table; 14055538fbcSTaniya Das dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus); 1412849dd8bSTaniya Das 1422849dd8bSTaniya Das return 0; 1432849dd8bSTaniya Das } 1442849dd8bSTaniya Das 1452849dd8bSTaniya Das static void qcom_get_related_cpus(int index, struct cpumask *m) 1462849dd8bSTaniya Das { 1472849dd8bSTaniya Das struct device_node *cpu_np; 1482849dd8bSTaniya Das struct of_phandle_args args; 1492849dd8bSTaniya Das int cpu, ret; 1502849dd8bSTaniya Das 1512849dd8bSTaniya Das for_each_possible_cpu(cpu) { 1522849dd8bSTaniya Das cpu_np = of_cpu_device_node_get(cpu); 1532849dd8bSTaniya Das if (!cpu_np) 1542849dd8bSTaniya Das continue; 1552849dd8bSTaniya Das 1562849dd8bSTaniya Das ret = of_parse_phandle_with_args(cpu_np, "qcom,freq-domain", 1572849dd8bSTaniya Das "#freq-domain-cells", 0, 1582849dd8bSTaniya Das &args); 1592849dd8bSTaniya Das of_node_put(cpu_np); 1602849dd8bSTaniya Das if (ret < 0) 1612849dd8bSTaniya Das continue; 1622849dd8bSTaniya Das 1632849dd8bSTaniya Das if (index == args.args[0]) 1642849dd8bSTaniya Das cpumask_set_cpu(cpu, m); 1652849dd8bSTaniya Das } 1662849dd8bSTaniya Das } 1672849dd8bSTaniya Das 1682849dd8bSTaniya Das static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy) 1692849dd8bSTaniya Das { 1702849dd8bSTaniya Das struct device *dev = &global_pdev->dev; 1712849dd8bSTaniya Das struct of_phandle_args args; 1722849dd8bSTaniya Das struct device_node *cpu_np; 17355538fbcSTaniya Das struct device *cpu_dev; 1742849dd8bSTaniya Das struct resource *res; 1752849dd8bSTaniya Das void __iomem *base; 1762849dd8bSTaniya Das int ret, index; 1772849dd8bSTaniya Das 17855538fbcSTaniya Das cpu_dev = get_cpu_device(policy->cpu); 17955538fbcSTaniya Das if (!cpu_dev) { 18055538fbcSTaniya Das pr_err("%s: failed to get cpu%d device\n", __func__, 18155538fbcSTaniya Das policy->cpu); 18255538fbcSTaniya Das return -ENODEV; 18355538fbcSTaniya Das } 18455538fbcSTaniya Das 1852849dd8bSTaniya Das cpu_np = of_cpu_device_node_get(policy->cpu); 1862849dd8bSTaniya Das if (!cpu_np) 1872849dd8bSTaniya Das return -EINVAL; 1882849dd8bSTaniya Das 1892849dd8bSTaniya Das ret = of_parse_phandle_with_args(cpu_np, "qcom,freq-domain", 1902849dd8bSTaniya Das "#freq-domain-cells", 0, &args); 1912849dd8bSTaniya Das of_node_put(cpu_np); 1922849dd8bSTaniya Das if (ret) 1932849dd8bSTaniya Das return ret; 1942849dd8bSTaniya Das 1952849dd8bSTaniya Das index = args.args[0]; 1962849dd8bSTaniya Das 1972849dd8bSTaniya Das res = platform_get_resource(global_pdev, IORESOURCE_MEM, index); 1982849dd8bSTaniya Das if (!res) 1992849dd8bSTaniya Das return -ENODEV; 2002849dd8bSTaniya Das 2012849dd8bSTaniya Das base = devm_ioremap(dev, res->start, resource_size(res)); 2022849dd8bSTaniya Das if (!base) 2032849dd8bSTaniya Das return -ENOMEM; 2042849dd8bSTaniya Das 2052849dd8bSTaniya Das /* HW should be in enabled state to proceed */ 2062849dd8bSTaniya Das if (!(readl_relaxed(base + REG_ENABLE) & 0x1)) { 2072849dd8bSTaniya Das dev_err(dev, "Domain-%d cpufreq hardware not enabled\n", index); 2082849dd8bSTaniya Das ret = -ENODEV; 2092849dd8bSTaniya Das goto error; 2102849dd8bSTaniya Das } 2112849dd8bSTaniya Das 2122849dd8bSTaniya Das qcom_get_related_cpus(index, policy->cpus); 2132849dd8bSTaniya Das if (!cpumask_weight(policy->cpus)) { 2142849dd8bSTaniya Das dev_err(dev, "Domain-%d failed to get related CPUs\n", index); 2152849dd8bSTaniya Das ret = -ENOENT; 2162849dd8bSTaniya Das goto error; 2172849dd8bSTaniya Das } 2182849dd8bSTaniya Das 2192849dd8bSTaniya Das policy->driver_data = base + REG_PERF_STATE; 2202849dd8bSTaniya Das 22155538fbcSTaniya Das ret = qcom_cpufreq_hw_read_lut(cpu_dev, policy, base); 2222849dd8bSTaniya Das if (ret) { 2232849dd8bSTaniya Das dev_err(dev, "Domain-%d failed to read LUT\n", index); 2242849dd8bSTaniya Das goto error; 2252849dd8bSTaniya Das } 2262849dd8bSTaniya Das 22755538fbcSTaniya Das ret = dev_pm_opp_get_opp_count(cpu_dev); 22855538fbcSTaniya Das if (ret <= 0) { 22955538fbcSTaniya Das dev_err(cpu_dev, "Failed to add OPPs\n"); 23055538fbcSTaniya Das ret = -ENODEV; 23155538fbcSTaniya Das goto error; 23255538fbcSTaniya Das } 23355538fbcSTaniya Das 234dab53505SMatthias Kaehlcke dev_pm_opp_of_register_em(policy->cpus); 235dab53505SMatthias Kaehlcke 2362849dd8bSTaniya Das policy->fast_switch_possible = true; 2372849dd8bSTaniya Das 2382849dd8bSTaniya Das return 0; 2392849dd8bSTaniya Das error: 2402849dd8bSTaniya Das devm_iounmap(dev, base); 2412849dd8bSTaniya Das return ret; 2422849dd8bSTaniya Das } 2432849dd8bSTaniya Das 2442849dd8bSTaniya Das static int qcom_cpufreq_hw_cpu_exit(struct cpufreq_policy *policy) 2452849dd8bSTaniya Das { 24655538fbcSTaniya Das struct device *cpu_dev = get_cpu_device(policy->cpu); 2472849dd8bSTaniya Das void __iomem *base = policy->driver_data - REG_PERF_STATE; 2482849dd8bSTaniya Das 24955538fbcSTaniya Das dev_pm_opp_remove_all_dynamic(cpu_dev); 2502849dd8bSTaniya Das kfree(policy->freq_table); 2512849dd8bSTaniya Das devm_iounmap(&global_pdev->dev, base); 2522849dd8bSTaniya Das 2532849dd8bSTaniya Das return 0; 2542849dd8bSTaniya Das } 2552849dd8bSTaniya Das 2562849dd8bSTaniya Das static struct freq_attr *qcom_cpufreq_hw_attr[] = { 2572849dd8bSTaniya Das &cpufreq_freq_attr_scaling_available_freqs, 2582849dd8bSTaniya Das &cpufreq_freq_attr_scaling_boost_freqs, 2592849dd8bSTaniya Das NULL 2602849dd8bSTaniya Das }; 2612849dd8bSTaniya Das 2622849dd8bSTaniya Das static struct cpufreq_driver cpufreq_qcom_hw_driver = { 2632849dd8bSTaniya Das .flags = CPUFREQ_STICKY | CPUFREQ_NEED_INITIAL_FREQ_CHECK | 2642849dd8bSTaniya Das CPUFREQ_HAVE_GOVERNOR_PER_POLICY, 2652849dd8bSTaniya Das .verify = cpufreq_generic_frequency_table_verify, 2662849dd8bSTaniya Das .target_index = qcom_cpufreq_hw_target_index, 2672849dd8bSTaniya Das .get = qcom_cpufreq_hw_get, 2682849dd8bSTaniya Das .init = qcom_cpufreq_hw_cpu_init, 2692849dd8bSTaniya Das .exit = qcom_cpufreq_hw_cpu_exit, 2702849dd8bSTaniya Das .fast_switch = qcom_cpufreq_hw_fast_switch, 2712849dd8bSTaniya Das .name = "qcom-cpufreq-hw", 2722849dd8bSTaniya Das .attr = qcom_cpufreq_hw_attr, 2732849dd8bSTaniya Das }; 2742849dd8bSTaniya Das 2752849dd8bSTaniya Das static int qcom_cpufreq_hw_driver_probe(struct platform_device *pdev) 2762849dd8bSTaniya Das { 2772849dd8bSTaniya Das struct clk *clk; 2782849dd8bSTaniya Das int ret; 2792849dd8bSTaniya Das 2802849dd8bSTaniya Das clk = clk_get(&pdev->dev, "xo"); 2812849dd8bSTaniya Das if (IS_ERR(clk)) 2822849dd8bSTaniya Das return PTR_ERR(clk); 2832849dd8bSTaniya Das 2842849dd8bSTaniya Das xo_rate = clk_get_rate(clk); 2852849dd8bSTaniya Das clk_put(clk); 2862849dd8bSTaniya Das 2872849dd8bSTaniya Das clk = clk_get(&pdev->dev, "alternate"); 2882849dd8bSTaniya Das if (IS_ERR(clk)) 2892849dd8bSTaniya Das return PTR_ERR(clk); 2902849dd8bSTaniya Das 2912849dd8bSTaniya Das cpu_hw_rate = clk_get_rate(clk) / CLK_HW_DIV; 2922849dd8bSTaniya Das clk_put(clk); 2932849dd8bSTaniya Das 2942849dd8bSTaniya Das global_pdev = pdev; 2952849dd8bSTaniya Das 2962849dd8bSTaniya Das ret = cpufreq_register_driver(&cpufreq_qcom_hw_driver); 2972849dd8bSTaniya Das if (ret) 2982849dd8bSTaniya Das dev_err(&pdev->dev, "CPUFreq HW driver failed to register\n"); 2992849dd8bSTaniya Das else 3002849dd8bSTaniya Das dev_dbg(&pdev->dev, "QCOM CPUFreq HW driver initialized\n"); 3012849dd8bSTaniya Das 3022849dd8bSTaniya Das return ret; 3032849dd8bSTaniya Das } 3042849dd8bSTaniya Das 3052849dd8bSTaniya Das static int qcom_cpufreq_hw_driver_remove(struct platform_device *pdev) 3062849dd8bSTaniya Das { 3072849dd8bSTaniya Das return cpufreq_unregister_driver(&cpufreq_qcom_hw_driver); 3082849dd8bSTaniya Das } 3092849dd8bSTaniya Das 3102849dd8bSTaniya Das static const struct of_device_id qcom_cpufreq_hw_match[] = { 3112849dd8bSTaniya Das { .compatible = "qcom,cpufreq-hw" }, 3122849dd8bSTaniya Das {} 3132849dd8bSTaniya Das }; 3142849dd8bSTaniya Das MODULE_DEVICE_TABLE(of, qcom_cpufreq_hw_match); 3152849dd8bSTaniya Das 3162849dd8bSTaniya Das static struct platform_driver qcom_cpufreq_hw_driver = { 3172849dd8bSTaniya Das .probe = qcom_cpufreq_hw_driver_probe, 3182849dd8bSTaniya Das .remove = qcom_cpufreq_hw_driver_remove, 3192849dd8bSTaniya Das .driver = { 3202849dd8bSTaniya Das .name = "qcom-cpufreq-hw", 3212849dd8bSTaniya Das .of_match_table = qcom_cpufreq_hw_match, 3222849dd8bSTaniya Das }, 3232849dd8bSTaniya Das }; 3242849dd8bSTaniya Das 3252849dd8bSTaniya Das static int __init qcom_cpufreq_hw_init(void) 3262849dd8bSTaniya Das { 3272849dd8bSTaniya Das return platform_driver_register(&qcom_cpufreq_hw_driver); 3282849dd8bSTaniya Das } 329f896d066SAmit Kucheria device_initcall(qcom_cpufreq_hw_init); 3302849dd8bSTaniya Das 3312849dd8bSTaniya Das static void __exit qcom_cpufreq_hw_exit(void) 3322849dd8bSTaniya Das { 3332849dd8bSTaniya Das platform_driver_unregister(&qcom_cpufreq_hw_driver); 3342849dd8bSTaniya Das } 3352849dd8bSTaniya Das module_exit(qcom_cpufreq_hw_exit); 3362849dd8bSTaniya Das 3372849dd8bSTaniya Das MODULE_DESCRIPTION("QCOM CPUFREQ HW Driver"); 3382849dd8bSTaniya Das MODULE_LICENSE("GPL v2"); 339