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 230eae1e37SSibi Sankar #define LUT_TURBO_IND 1 242849dd8bSTaniya Das 252849dd8bSTaniya Das /* Register offsets */ 262849dd8bSTaniya Das #define REG_ENABLE 0x0 2755538fbcSTaniya Das #define REG_FREQ_LUT 0x110 2855538fbcSTaniya Das #define REG_VOLT_LUT 0x114 292849dd8bSTaniya Das #define REG_PERF_STATE 0x920 302849dd8bSTaniya Das 312849dd8bSTaniya Das static unsigned long cpu_hw_rate, xo_rate; 322849dd8bSTaniya Das static struct platform_device *global_pdev; 332849dd8bSTaniya Das 342849dd8bSTaniya Das static int qcom_cpufreq_hw_target_index(struct cpufreq_policy *policy, 352849dd8bSTaniya Das unsigned int index) 362849dd8bSTaniya Das { 372849dd8bSTaniya Das void __iomem *perf_state_reg = policy->driver_data; 38ada54f35SDouglas RAILLARD unsigned long freq = policy->freq_table[index].frequency; 392849dd8bSTaniya Das 402849dd8bSTaniya Das writel_relaxed(index, perf_state_reg); 412849dd8bSTaniya Das 42ada54f35SDouglas RAILLARD arch_set_freq_scale(policy->related_cpus, freq, 43ada54f35SDouglas RAILLARD policy->cpuinfo.max_freq); 442849dd8bSTaniya Das return 0; 452849dd8bSTaniya Das } 462849dd8bSTaniya Das 472849dd8bSTaniya Das static unsigned int qcom_cpufreq_hw_get(unsigned int cpu) 482849dd8bSTaniya Das { 492849dd8bSTaniya Das void __iomem *perf_state_reg; 502849dd8bSTaniya Das struct cpufreq_policy *policy; 512849dd8bSTaniya Das unsigned int index; 522849dd8bSTaniya Das 532849dd8bSTaniya Das policy = cpufreq_cpu_get_raw(cpu); 542849dd8bSTaniya Das if (!policy) 552849dd8bSTaniya Das return 0; 562849dd8bSTaniya Das 572849dd8bSTaniya Das perf_state_reg = policy->driver_data; 582849dd8bSTaniya Das 592849dd8bSTaniya Das index = readl_relaxed(perf_state_reg); 602849dd8bSTaniya Das index = min(index, LUT_MAX_ENTRIES - 1); 612849dd8bSTaniya Das 622849dd8bSTaniya Das return policy->freq_table[index].frequency; 632849dd8bSTaniya Das } 642849dd8bSTaniya Das 652849dd8bSTaniya Das static unsigned int qcom_cpufreq_hw_fast_switch(struct cpufreq_policy *policy, 662849dd8bSTaniya Das unsigned int target_freq) 672849dd8bSTaniya Das { 682849dd8bSTaniya Das void __iomem *perf_state_reg = policy->driver_data; 692849dd8bSTaniya Das int index; 70ada54f35SDouglas RAILLARD unsigned long freq; 712849dd8bSTaniya Das 722849dd8bSTaniya Das index = policy->cached_resolved_idx; 732849dd8bSTaniya Das if (index < 0) 742849dd8bSTaniya Das return 0; 752849dd8bSTaniya Das 762849dd8bSTaniya Das writel_relaxed(index, perf_state_reg); 772849dd8bSTaniya Das 78ada54f35SDouglas RAILLARD freq = policy->freq_table[index].frequency; 79ada54f35SDouglas RAILLARD arch_set_freq_scale(policy->related_cpus, freq, 80ada54f35SDouglas RAILLARD policy->cpuinfo.max_freq); 81ada54f35SDouglas RAILLARD 82ada54f35SDouglas RAILLARD return freq; 832849dd8bSTaniya Das } 842849dd8bSTaniya Das 8555538fbcSTaniya Das static int qcom_cpufreq_hw_read_lut(struct device *cpu_dev, 862849dd8bSTaniya Das struct cpufreq_policy *policy, 872849dd8bSTaniya Das void __iomem *base) 882849dd8bSTaniya Das { 890eae1e37SSibi Sankar u32 data, src, lval, i, core_count, prev_freq = 0, freq; 9055538fbcSTaniya Das u32 volt; 912849dd8bSTaniya Das struct cpufreq_frequency_table *table; 922849dd8bSTaniya Das 932849dd8bSTaniya Das table = kcalloc(LUT_MAX_ENTRIES + 1, sizeof(*table), GFP_KERNEL); 942849dd8bSTaniya Das if (!table) 952849dd8bSTaniya Das return -ENOMEM; 962849dd8bSTaniya Das 972849dd8bSTaniya Das for (i = 0; i < LUT_MAX_ENTRIES; i++) { 9855538fbcSTaniya Das data = readl_relaxed(base + REG_FREQ_LUT + 9955538fbcSTaniya Das i * LUT_ROW_SIZE); 1002849dd8bSTaniya Das src = FIELD_GET(LUT_SRC, data); 1012849dd8bSTaniya Das lval = FIELD_GET(LUT_L_VAL, data); 1022849dd8bSTaniya Das core_count = FIELD_GET(LUT_CORE_COUNT, data); 1032849dd8bSTaniya Das 10455538fbcSTaniya Das data = readl_relaxed(base + REG_VOLT_LUT + 10555538fbcSTaniya Das i * LUT_ROW_SIZE); 10655538fbcSTaniya Das volt = FIELD_GET(LUT_VOLT, data) * 1000; 10755538fbcSTaniya Das 1082849dd8bSTaniya Das if (src) 1092849dd8bSTaniya Das freq = xo_rate * lval / 1000; 1102849dd8bSTaniya Das else 1112849dd8bSTaniya Das freq = cpu_hw_rate / 1000; 1122849dd8bSTaniya Das 1130eae1e37SSibi Sankar if (freq != prev_freq && core_count != LUT_TURBO_IND) { 1142849dd8bSTaniya Das table[i].frequency = freq; 11555538fbcSTaniya Das dev_pm_opp_add(cpu_dev, freq * 1000, volt); 11655538fbcSTaniya Das dev_dbg(cpu_dev, "index=%d freq=%d, core_count %d\n", i, 1172849dd8bSTaniya Das freq, core_count); 1180eae1e37SSibi Sankar } else if (core_count == LUT_TURBO_IND) { 11955538fbcSTaniya Das table[i].frequency = CPUFREQ_ENTRY_INVALID; 1202849dd8bSTaniya Das } 1212849dd8bSTaniya Das 1222849dd8bSTaniya Das /* 1232849dd8bSTaniya Das * Two of the same frequencies with the same core counts means 1242849dd8bSTaniya Das * end of table 1252849dd8bSTaniya Das */ 1260eae1e37SSibi Sankar if (i > 0 && prev_freq == freq) { 1272849dd8bSTaniya Das struct cpufreq_frequency_table *prev = &table[i - 1]; 1282849dd8bSTaniya Das 1292849dd8bSTaniya Das /* 1302849dd8bSTaniya Das * Only treat the last frequency that might be a boost 1312849dd8bSTaniya Das * as the boost frequency 1322849dd8bSTaniya Das */ 1330eae1e37SSibi Sankar if (prev->frequency == CPUFREQ_ENTRY_INVALID) { 1342849dd8bSTaniya Das prev->frequency = prev_freq; 1352849dd8bSTaniya Das prev->flags = CPUFREQ_BOOST_FREQ; 13655538fbcSTaniya Das dev_pm_opp_add(cpu_dev, prev_freq * 1000, volt); 1372849dd8bSTaniya Das } 1382849dd8bSTaniya Das 1392849dd8bSTaniya Das break; 1402849dd8bSTaniya Das } 1412849dd8bSTaniya Das 1422849dd8bSTaniya Das prev_freq = freq; 1432849dd8bSTaniya Das } 1442849dd8bSTaniya Das 1452849dd8bSTaniya Das table[i].frequency = CPUFREQ_TABLE_END; 1462849dd8bSTaniya Das policy->freq_table = table; 14755538fbcSTaniya Das dev_pm_opp_set_sharing_cpus(cpu_dev, policy->cpus); 1482849dd8bSTaniya Das 1492849dd8bSTaniya Das return 0; 1502849dd8bSTaniya Das } 1512849dd8bSTaniya Das 1522849dd8bSTaniya Das static void qcom_get_related_cpus(int index, struct cpumask *m) 1532849dd8bSTaniya Das { 1542849dd8bSTaniya Das struct device_node *cpu_np; 1552849dd8bSTaniya Das struct of_phandle_args args; 1562849dd8bSTaniya Das int cpu, ret; 1572849dd8bSTaniya Das 1582849dd8bSTaniya Das for_each_possible_cpu(cpu) { 1592849dd8bSTaniya Das cpu_np = of_cpu_device_node_get(cpu); 1602849dd8bSTaniya Das if (!cpu_np) 1612849dd8bSTaniya Das continue; 1622849dd8bSTaniya Das 1632849dd8bSTaniya Das ret = of_parse_phandle_with_args(cpu_np, "qcom,freq-domain", 1642849dd8bSTaniya Das "#freq-domain-cells", 0, 1652849dd8bSTaniya Das &args); 1662849dd8bSTaniya Das of_node_put(cpu_np); 1672849dd8bSTaniya Das if (ret < 0) 1682849dd8bSTaniya Das continue; 1692849dd8bSTaniya Das 1702849dd8bSTaniya Das if (index == args.args[0]) 1712849dd8bSTaniya Das cpumask_set_cpu(cpu, m); 1722849dd8bSTaniya Das } 1732849dd8bSTaniya Das } 1742849dd8bSTaniya Das 1752849dd8bSTaniya Das static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy) 1762849dd8bSTaniya Das { 1772849dd8bSTaniya Das struct device *dev = &global_pdev->dev; 1782849dd8bSTaniya Das struct of_phandle_args args; 1792849dd8bSTaniya Das struct device_node *cpu_np; 18055538fbcSTaniya Das struct device *cpu_dev; 1812849dd8bSTaniya Das struct resource *res; 1822849dd8bSTaniya Das void __iomem *base; 1832849dd8bSTaniya Das int ret, index; 1842849dd8bSTaniya Das 18555538fbcSTaniya Das cpu_dev = get_cpu_device(policy->cpu); 18655538fbcSTaniya Das if (!cpu_dev) { 18755538fbcSTaniya Das pr_err("%s: failed to get cpu%d device\n", __func__, 18855538fbcSTaniya Das policy->cpu); 18955538fbcSTaniya Das return -ENODEV; 19055538fbcSTaniya Das } 19155538fbcSTaniya Das 1922849dd8bSTaniya Das cpu_np = of_cpu_device_node_get(policy->cpu); 1932849dd8bSTaniya Das if (!cpu_np) 1942849dd8bSTaniya Das return -EINVAL; 1952849dd8bSTaniya Das 1962849dd8bSTaniya Das ret = of_parse_phandle_with_args(cpu_np, "qcom,freq-domain", 1972849dd8bSTaniya Das "#freq-domain-cells", 0, &args); 1982849dd8bSTaniya Das of_node_put(cpu_np); 1992849dd8bSTaniya Das if (ret) 2002849dd8bSTaniya Das return ret; 2012849dd8bSTaniya Das 2022849dd8bSTaniya Das index = args.args[0]; 2032849dd8bSTaniya Das 2042849dd8bSTaniya Das res = platform_get_resource(global_pdev, IORESOURCE_MEM, index); 2052849dd8bSTaniya Das if (!res) 2062849dd8bSTaniya Das return -ENODEV; 2072849dd8bSTaniya Das 2082849dd8bSTaniya Das base = devm_ioremap(dev, res->start, resource_size(res)); 2092849dd8bSTaniya Das if (!base) 2102849dd8bSTaniya Das return -ENOMEM; 2112849dd8bSTaniya Das 2122849dd8bSTaniya Das /* HW should be in enabled state to proceed */ 2132849dd8bSTaniya Das if (!(readl_relaxed(base + REG_ENABLE) & 0x1)) { 2142849dd8bSTaniya Das dev_err(dev, "Domain-%d cpufreq hardware not enabled\n", index); 2152849dd8bSTaniya Das ret = -ENODEV; 2162849dd8bSTaniya Das goto error; 2172849dd8bSTaniya Das } 2182849dd8bSTaniya Das 2192849dd8bSTaniya Das qcom_get_related_cpus(index, policy->cpus); 2202849dd8bSTaniya Das if (!cpumask_weight(policy->cpus)) { 2212849dd8bSTaniya Das dev_err(dev, "Domain-%d failed to get related CPUs\n", index); 2222849dd8bSTaniya Das ret = -ENOENT; 2232849dd8bSTaniya Das goto error; 2242849dd8bSTaniya Das } 2252849dd8bSTaniya Das 2262849dd8bSTaniya Das policy->driver_data = base + REG_PERF_STATE; 2272849dd8bSTaniya Das 22855538fbcSTaniya Das ret = qcom_cpufreq_hw_read_lut(cpu_dev, policy, base); 2292849dd8bSTaniya Das if (ret) { 2302849dd8bSTaniya Das dev_err(dev, "Domain-%d failed to read LUT\n", index); 2312849dd8bSTaniya Das goto error; 2322849dd8bSTaniya Das } 2332849dd8bSTaniya Das 23455538fbcSTaniya Das ret = dev_pm_opp_get_opp_count(cpu_dev); 23555538fbcSTaniya Das if (ret <= 0) { 23655538fbcSTaniya Das dev_err(cpu_dev, "Failed to add OPPs\n"); 23755538fbcSTaniya Das ret = -ENODEV; 23855538fbcSTaniya Das goto error; 23955538fbcSTaniya Das } 24055538fbcSTaniya Das 241dab53505SMatthias Kaehlcke dev_pm_opp_of_register_em(policy->cpus); 242dab53505SMatthias Kaehlcke 2432849dd8bSTaniya Das policy->fast_switch_possible = true; 2442849dd8bSTaniya Das 2452849dd8bSTaniya Das return 0; 2462849dd8bSTaniya Das error: 2472849dd8bSTaniya Das devm_iounmap(dev, base); 2482849dd8bSTaniya Das return ret; 2492849dd8bSTaniya Das } 2502849dd8bSTaniya Das 2512849dd8bSTaniya Das static int qcom_cpufreq_hw_cpu_exit(struct cpufreq_policy *policy) 2522849dd8bSTaniya Das { 25355538fbcSTaniya Das struct device *cpu_dev = get_cpu_device(policy->cpu); 2542849dd8bSTaniya Das void __iomem *base = policy->driver_data - REG_PERF_STATE; 2552849dd8bSTaniya Das 25655538fbcSTaniya Das dev_pm_opp_remove_all_dynamic(cpu_dev); 2572849dd8bSTaniya Das kfree(policy->freq_table); 2582849dd8bSTaniya Das devm_iounmap(&global_pdev->dev, base); 2592849dd8bSTaniya Das 2602849dd8bSTaniya Das return 0; 2612849dd8bSTaniya Das } 2622849dd8bSTaniya Das 2632849dd8bSTaniya Das static struct freq_attr *qcom_cpufreq_hw_attr[] = { 2642849dd8bSTaniya Das &cpufreq_freq_attr_scaling_available_freqs, 2652849dd8bSTaniya Das &cpufreq_freq_attr_scaling_boost_freqs, 2662849dd8bSTaniya Das NULL 2672849dd8bSTaniya Das }; 2682849dd8bSTaniya Das 2692849dd8bSTaniya Das static struct cpufreq_driver cpufreq_qcom_hw_driver = { 2702849dd8bSTaniya Das .flags = CPUFREQ_STICKY | CPUFREQ_NEED_INITIAL_FREQ_CHECK | 2714c5ff1c8SAmit Kucheria CPUFREQ_HAVE_GOVERNOR_PER_POLICY | 2724c5ff1c8SAmit Kucheria CPUFREQ_IS_COOLING_DEV, 2732849dd8bSTaniya Das .verify = cpufreq_generic_frequency_table_verify, 2742849dd8bSTaniya Das .target_index = qcom_cpufreq_hw_target_index, 2752849dd8bSTaniya Das .get = qcom_cpufreq_hw_get, 2762849dd8bSTaniya Das .init = qcom_cpufreq_hw_cpu_init, 2772849dd8bSTaniya Das .exit = qcom_cpufreq_hw_cpu_exit, 2782849dd8bSTaniya Das .fast_switch = qcom_cpufreq_hw_fast_switch, 2792849dd8bSTaniya Das .name = "qcom-cpufreq-hw", 2802849dd8bSTaniya Das .attr = qcom_cpufreq_hw_attr, 2812849dd8bSTaniya Das }; 2822849dd8bSTaniya Das 2832849dd8bSTaniya Das static int qcom_cpufreq_hw_driver_probe(struct platform_device *pdev) 2842849dd8bSTaniya Das { 2852849dd8bSTaniya Das struct clk *clk; 2862849dd8bSTaniya Das int ret; 2872849dd8bSTaniya Das 2882849dd8bSTaniya Das clk = clk_get(&pdev->dev, "xo"); 2892849dd8bSTaniya Das if (IS_ERR(clk)) 2902849dd8bSTaniya Das return PTR_ERR(clk); 2912849dd8bSTaniya Das 2922849dd8bSTaniya Das xo_rate = clk_get_rate(clk); 2932849dd8bSTaniya Das clk_put(clk); 2942849dd8bSTaniya Das 2952849dd8bSTaniya Das clk = clk_get(&pdev->dev, "alternate"); 2962849dd8bSTaniya Das if (IS_ERR(clk)) 2972849dd8bSTaniya Das return PTR_ERR(clk); 2982849dd8bSTaniya Das 2992849dd8bSTaniya Das cpu_hw_rate = clk_get_rate(clk) / CLK_HW_DIV; 3002849dd8bSTaniya Das clk_put(clk); 3012849dd8bSTaniya Das 3022849dd8bSTaniya Das global_pdev = pdev; 3032849dd8bSTaniya Das 3042849dd8bSTaniya Das ret = cpufreq_register_driver(&cpufreq_qcom_hw_driver); 3052849dd8bSTaniya Das if (ret) 3062849dd8bSTaniya Das dev_err(&pdev->dev, "CPUFreq HW driver failed to register\n"); 3072849dd8bSTaniya Das else 3082849dd8bSTaniya Das dev_dbg(&pdev->dev, "QCOM CPUFreq HW driver initialized\n"); 3092849dd8bSTaniya Das 3102849dd8bSTaniya Das return ret; 3112849dd8bSTaniya Das } 3122849dd8bSTaniya Das 3132849dd8bSTaniya Das static int qcom_cpufreq_hw_driver_remove(struct platform_device *pdev) 3142849dd8bSTaniya Das { 3152849dd8bSTaniya Das return cpufreq_unregister_driver(&cpufreq_qcom_hw_driver); 3162849dd8bSTaniya Das } 3172849dd8bSTaniya Das 3182849dd8bSTaniya Das static const struct of_device_id qcom_cpufreq_hw_match[] = { 3192849dd8bSTaniya Das { .compatible = "qcom,cpufreq-hw" }, 3202849dd8bSTaniya Das {} 3212849dd8bSTaniya Das }; 3222849dd8bSTaniya Das MODULE_DEVICE_TABLE(of, qcom_cpufreq_hw_match); 3232849dd8bSTaniya Das 3242849dd8bSTaniya Das static struct platform_driver qcom_cpufreq_hw_driver = { 3252849dd8bSTaniya Das .probe = qcom_cpufreq_hw_driver_probe, 3262849dd8bSTaniya Das .remove = qcom_cpufreq_hw_driver_remove, 3272849dd8bSTaniya Das .driver = { 3282849dd8bSTaniya Das .name = "qcom-cpufreq-hw", 3292849dd8bSTaniya Das .of_match_table = qcom_cpufreq_hw_match, 3302849dd8bSTaniya Das }, 3312849dd8bSTaniya Das }; 3322849dd8bSTaniya Das 3332849dd8bSTaniya Das static int __init qcom_cpufreq_hw_init(void) 3342849dd8bSTaniya Das { 3352849dd8bSTaniya Das return platform_driver_register(&qcom_cpufreq_hw_driver); 3362849dd8bSTaniya Das } 33711ff4bddSAmit Kucheria postcore_initcall(qcom_cpufreq_hw_init); 3382849dd8bSTaniya Das 3392849dd8bSTaniya Das static void __exit qcom_cpufreq_hw_exit(void) 3402849dd8bSTaniya Das { 3412849dd8bSTaniya Das platform_driver_unregister(&qcom_cpufreq_hw_driver); 3422849dd8bSTaniya Das } 3432849dd8bSTaniya Das module_exit(qcom_cpufreq_hw_exit); 3442849dd8bSTaniya Das 3452849dd8bSTaniya Das MODULE_DESCRIPTION("QCOM CPUFREQ HW Driver"); 3462849dd8bSTaniya Das MODULE_LICENSE("GPL v2"); 347