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> 132849dd8bSTaniya Das #include <linux/slab.h> 142849dd8bSTaniya Das 152849dd8bSTaniya Das #define LUT_MAX_ENTRIES 40U 162849dd8bSTaniya Das #define LUT_SRC GENMASK(31, 30) 172849dd8bSTaniya Das #define LUT_L_VAL GENMASK(7, 0) 182849dd8bSTaniya Das #define LUT_CORE_COUNT GENMASK(18, 16) 192849dd8bSTaniya Das #define LUT_ROW_SIZE 32 202849dd8bSTaniya Das #define CLK_HW_DIV 2 212849dd8bSTaniya Das 222849dd8bSTaniya Das /* Register offsets */ 232849dd8bSTaniya Das #define REG_ENABLE 0x0 242849dd8bSTaniya Das #define REG_LUT_TABLE 0x110 252849dd8bSTaniya Das #define REG_PERF_STATE 0x920 262849dd8bSTaniya Das 272849dd8bSTaniya Das static unsigned long cpu_hw_rate, xo_rate; 282849dd8bSTaniya Das static struct platform_device *global_pdev; 292849dd8bSTaniya Das 302849dd8bSTaniya Das static int qcom_cpufreq_hw_target_index(struct cpufreq_policy *policy, 312849dd8bSTaniya Das unsigned int index) 322849dd8bSTaniya Das { 332849dd8bSTaniya Das void __iomem *perf_state_reg = policy->driver_data; 342849dd8bSTaniya Das 352849dd8bSTaniya Das writel_relaxed(index, perf_state_reg); 362849dd8bSTaniya Das 372849dd8bSTaniya Das return 0; 382849dd8bSTaniya Das } 392849dd8bSTaniya Das 402849dd8bSTaniya Das static unsigned int qcom_cpufreq_hw_get(unsigned int cpu) 412849dd8bSTaniya Das { 422849dd8bSTaniya Das void __iomem *perf_state_reg; 432849dd8bSTaniya Das struct cpufreq_policy *policy; 442849dd8bSTaniya Das unsigned int index; 452849dd8bSTaniya Das 462849dd8bSTaniya Das policy = cpufreq_cpu_get_raw(cpu); 472849dd8bSTaniya Das if (!policy) 482849dd8bSTaniya Das return 0; 492849dd8bSTaniya Das 502849dd8bSTaniya Das perf_state_reg = policy->driver_data; 512849dd8bSTaniya Das 522849dd8bSTaniya Das index = readl_relaxed(perf_state_reg); 532849dd8bSTaniya Das index = min(index, LUT_MAX_ENTRIES - 1); 542849dd8bSTaniya Das 552849dd8bSTaniya Das return policy->freq_table[index].frequency; 562849dd8bSTaniya Das } 572849dd8bSTaniya Das 582849dd8bSTaniya Das static unsigned int qcom_cpufreq_hw_fast_switch(struct cpufreq_policy *policy, 592849dd8bSTaniya Das unsigned int target_freq) 602849dd8bSTaniya Das { 612849dd8bSTaniya Das void __iomem *perf_state_reg = policy->driver_data; 622849dd8bSTaniya Das int index; 632849dd8bSTaniya Das 642849dd8bSTaniya Das index = policy->cached_resolved_idx; 652849dd8bSTaniya Das if (index < 0) 662849dd8bSTaniya Das return 0; 672849dd8bSTaniya Das 682849dd8bSTaniya Das writel_relaxed(index, perf_state_reg); 692849dd8bSTaniya Das 702849dd8bSTaniya Das return policy->freq_table[index].frequency; 712849dd8bSTaniya Das } 722849dd8bSTaniya Das 732849dd8bSTaniya Das static int qcom_cpufreq_hw_read_lut(struct device *dev, 742849dd8bSTaniya Das struct cpufreq_policy *policy, 752849dd8bSTaniya Das void __iomem *base) 762849dd8bSTaniya Das { 772849dd8bSTaniya Das u32 data, src, lval, i, core_count, prev_cc = 0, prev_freq = 0, freq; 782849dd8bSTaniya Das unsigned int max_cores = cpumask_weight(policy->cpus); 792849dd8bSTaniya Das struct cpufreq_frequency_table *table; 802849dd8bSTaniya Das 812849dd8bSTaniya Das table = kcalloc(LUT_MAX_ENTRIES + 1, sizeof(*table), GFP_KERNEL); 822849dd8bSTaniya Das if (!table) 832849dd8bSTaniya Das return -ENOMEM; 842849dd8bSTaniya Das 852849dd8bSTaniya Das for (i = 0; i < LUT_MAX_ENTRIES; i++) { 862849dd8bSTaniya Das data = readl_relaxed(base + REG_LUT_TABLE + i * LUT_ROW_SIZE); 872849dd8bSTaniya Das src = FIELD_GET(LUT_SRC, data); 882849dd8bSTaniya Das lval = FIELD_GET(LUT_L_VAL, data); 892849dd8bSTaniya Das core_count = FIELD_GET(LUT_CORE_COUNT, data); 902849dd8bSTaniya Das 912849dd8bSTaniya Das if (src) 922849dd8bSTaniya Das freq = xo_rate * lval / 1000; 932849dd8bSTaniya Das else 942849dd8bSTaniya Das freq = cpu_hw_rate / 1000; 952849dd8bSTaniya Das 962849dd8bSTaniya Das /* Ignore boosts in the middle of the table */ 972849dd8bSTaniya Das if (core_count != max_cores) { 982849dd8bSTaniya Das table[i].frequency = CPUFREQ_ENTRY_INVALID; 992849dd8bSTaniya Das } else { 1002849dd8bSTaniya Das table[i].frequency = freq; 1012849dd8bSTaniya Das dev_dbg(dev, "index=%d freq=%d, core_count %d\n", i, 1022849dd8bSTaniya Das freq, core_count); 1032849dd8bSTaniya Das } 1042849dd8bSTaniya Das 1052849dd8bSTaniya Das /* 1062849dd8bSTaniya Das * Two of the same frequencies with the same core counts means 1072849dd8bSTaniya Das * end of table 1082849dd8bSTaniya Das */ 1092849dd8bSTaniya Das if (i > 0 && prev_freq == freq && prev_cc == core_count) { 1102849dd8bSTaniya Das struct cpufreq_frequency_table *prev = &table[i - 1]; 1112849dd8bSTaniya Das 1122849dd8bSTaniya Das /* 1132849dd8bSTaniya Das * Only treat the last frequency that might be a boost 1142849dd8bSTaniya Das * as the boost frequency 1152849dd8bSTaniya Das */ 1162849dd8bSTaniya Das if (prev_cc != max_cores) { 1172849dd8bSTaniya Das prev->frequency = prev_freq; 1182849dd8bSTaniya Das prev->flags = CPUFREQ_BOOST_FREQ; 1192849dd8bSTaniya Das } 1202849dd8bSTaniya Das 1212849dd8bSTaniya Das break; 1222849dd8bSTaniya Das } 1232849dd8bSTaniya Das 1242849dd8bSTaniya Das prev_cc = core_count; 1252849dd8bSTaniya Das prev_freq = freq; 1262849dd8bSTaniya Das } 1272849dd8bSTaniya Das 1282849dd8bSTaniya Das table[i].frequency = CPUFREQ_TABLE_END; 1292849dd8bSTaniya Das policy->freq_table = table; 1302849dd8bSTaniya Das 1312849dd8bSTaniya Das return 0; 1322849dd8bSTaniya Das } 1332849dd8bSTaniya Das 1342849dd8bSTaniya Das static void qcom_get_related_cpus(int index, struct cpumask *m) 1352849dd8bSTaniya Das { 1362849dd8bSTaniya Das struct device_node *cpu_np; 1372849dd8bSTaniya Das struct of_phandle_args args; 1382849dd8bSTaniya Das int cpu, ret; 1392849dd8bSTaniya Das 1402849dd8bSTaniya Das for_each_possible_cpu(cpu) { 1412849dd8bSTaniya Das cpu_np = of_cpu_device_node_get(cpu); 1422849dd8bSTaniya Das if (!cpu_np) 1432849dd8bSTaniya Das continue; 1442849dd8bSTaniya Das 1452849dd8bSTaniya Das ret = of_parse_phandle_with_args(cpu_np, "qcom,freq-domain", 1462849dd8bSTaniya Das "#freq-domain-cells", 0, 1472849dd8bSTaniya Das &args); 1482849dd8bSTaniya Das of_node_put(cpu_np); 1492849dd8bSTaniya Das if (ret < 0) 1502849dd8bSTaniya Das continue; 1512849dd8bSTaniya Das 1522849dd8bSTaniya Das if (index == args.args[0]) 1532849dd8bSTaniya Das cpumask_set_cpu(cpu, m); 1542849dd8bSTaniya Das } 1552849dd8bSTaniya Das } 1562849dd8bSTaniya Das 1572849dd8bSTaniya Das static int qcom_cpufreq_hw_cpu_init(struct cpufreq_policy *policy) 1582849dd8bSTaniya Das { 1592849dd8bSTaniya Das struct device *dev = &global_pdev->dev; 1602849dd8bSTaniya Das struct of_phandle_args args; 1612849dd8bSTaniya Das struct device_node *cpu_np; 1622849dd8bSTaniya Das struct resource *res; 1632849dd8bSTaniya Das void __iomem *base; 1642849dd8bSTaniya Das int ret, index; 1652849dd8bSTaniya Das 1662849dd8bSTaniya Das cpu_np = of_cpu_device_node_get(policy->cpu); 1672849dd8bSTaniya Das if (!cpu_np) 1682849dd8bSTaniya Das return -EINVAL; 1692849dd8bSTaniya Das 1702849dd8bSTaniya Das ret = of_parse_phandle_with_args(cpu_np, "qcom,freq-domain", 1712849dd8bSTaniya Das "#freq-domain-cells", 0, &args); 1722849dd8bSTaniya Das of_node_put(cpu_np); 1732849dd8bSTaniya Das if (ret) 1742849dd8bSTaniya Das return ret; 1752849dd8bSTaniya Das 1762849dd8bSTaniya Das index = args.args[0]; 1772849dd8bSTaniya Das 1782849dd8bSTaniya Das res = platform_get_resource(global_pdev, IORESOURCE_MEM, index); 1792849dd8bSTaniya Das if (!res) 1802849dd8bSTaniya Das return -ENODEV; 1812849dd8bSTaniya Das 1822849dd8bSTaniya Das base = devm_ioremap(dev, res->start, resource_size(res)); 1832849dd8bSTaniya Das if (!base) 1842849dd8bSTaniya Das return -ENOMEM; 1852849dd8bSTaniya Das 1862849dd8bSTaniya Das /* HW should be in enabled state to proceed */ 1872849dd8bSTaniya Das if (!(readl_relaxed(base + REG_ENABLE) & 0x1)) { 1882849dd8bSTaniya Das dev_err(dev, "Domain-%d cpufreq hardware not enabled\n", index); 1892849dd8bSTaniya Das ret = -ENODEV; 1902849dd8bSTaniya Das goto error; 1912849dd8bSTaniya Das } 1922849dd8bSTaniya Das 1932849dd8bSTaniya Das qcom_get_related_cpus(index, policy->cpus); 1942849dd8bSTaniya Das if (!cpumask_weight(policy->cpus)) { 1952849dd8bSTaniya Das dev_err(dev, "Domain-%d failed to get related CPUs\n", index); 1962849dd8bSTaniya Das ret = -ENOENT; 1972849dd8bSTaniya Das goto error; 1982849dd8bSTaniya Das } 1992849dd8bSTaniya Das 2002849dd8bSTaniya Das policy->driver_data = base + REG_PERF_STATE; 2012849dd8bSTaniya Das 2022849dd8bSTaniya Das ret = qcom_cpufreq_hw_read_lut(dev, policy, base); 2032849dd8bSTaniya Das if (ret) { 2042849dd8bSTaniya Das dev_err(dev, "Domain-%d failed to read LUT\n", index); 2052849dd8bSTaniya Das goto error; 2062849dd8bSTaniya Das } 2072849dd8bSTaniya Das 2082849dd8bSTaniya Das policy->fast_switch_possible = true; 2092849dd8bSTaniya Das 2102849dd8bSTaniya Das return 0; 2112849dd8bSTaniya Das error: 2122849dd8bSTaniya Das devm_iounmap(dev, base); 2132849dd8bSTaniya Das return ret; 2142849dd8bSTaniya Das } 2152849dd8bSTaniya Das 2162849dd8bSTaniya Das static int qcom_cpufreq_hw_cpu_exit(struct cpufreq_policy *policy) 2172849dd8bSTaniya Das { 2182849dd8bSTaniya Das void __iomem *base = policy->driver_data - REG_PERF_STATE; 2192849dd8bSTaniya Das 2202849dd8bSTaniya Das kfree(policy->freq_table); 2212849dd8bSTaniya Das devm_iounmap(&global_pdev->dev, base); 2222849dd8bSTaniya Das 2232849dd8bSTaniya Das return 0; 2242849dd8bSTaniya Das } 2252849dd8bSTaniya Das 2262849dd8bSTaniya Das static struct freq_attr *qcom_cpufreq_hw_attr[] = { 2272849dd8bSTaniya Das &cpufreq_freq_attr_scaling_available_freqs, 2282849dd8bSTaniya Das &cpufreq_freq_attr_scaling_boost_freqs, 2292849dd8bSTaniya Das NULL 2302849dd8bSTaniya Das }; 2312849dd8bSTaniya Das 2322849dd8bSTaniya Das static struct cpufreq_driver cpufreq_qcom_hw_driver = { 2332849dd8bSTaniya Das .flags = CPUFREQ_STICKY | CPUFREQ_NEED_INITIAL_FREQ_CHECK | 2344c5ff1c8SAmit Kucheria CPUFREQ_HAVE_GOVERNOR_PER_POLICY | 2354c5ff1c8SAmit Kucheria CPUFREQ_IS_COOLING_DEV, 2362849dd8bSTaniya Das .verify = cpufreq_generic_frequency_table_verify, 2372849dd8bSTaniya Das .target_index = qcom_cpufreq_hw_target_index, 2382849dd8bSTaniya Das .get = qcom_cpufreq_hw_get, 2392849dd8bSTaniya Das .init = qcom_cpufreq_hw_cpu_init, 2402849dd8bSTaniya Das .exit = qcom_cpufreq_hw_cpu_exit, 2412849dd8bSTaniya Das .fast_switch = qcom_cpufreq_hw_fast_switch, 2422849dd8bSTaniya Das .name = "qcom-cpufreq-hw", 2432849dd8bSTaniya Das .attr = qcom_cpufreq_hw_attr, 2442849dd8bSTaniya Das }; 2452849dd8bSTaniya Das 2462849dd8bSTaniya Das static int qcom_cpufreq_hw_driver_probe(struct platform_device *pdev) 2472849dd8bSTaniya Das { 2482849dd8bSTaniya Das struct clk *clk; 2492849dd8bSTaniya Das int ret; 2502849dd8bSTaniya Das 2512849dd8bSTaniya Das clk = clk_get(&pdev->dev, "xo"); 2522849dd8bSTaniya Das if (IS_ERR(clk)) 2532849dd8bSTaniya Das return PTR_ERR(clk); 2542849dd8bSTaniya Das 2552849dd8bSTaniya Das xo_rate = clk_get_rate(clk); 2562849dd8bSTaniya Das clk_put(clk); 2572849dd8bSTaniya Das 2582849dd8bSTaniya Das clk = clk_get(&pdev->dev, "alternate"); 2592849dd8bSTaniya Das if (IS_ERR(clk)) 2602849dd8bSTaniya Das return PTR_ERR(clk); 2612849dd8bSTaniya Das 2622849dd8bSTaniya Das cpu_hw_rate = clk_get_rate(clk) / CLK_HW_DIV; 2632849dd8bSTaniya Das clk_put(clk); 2642849dd8bSTaniya Das 2652849dd8bSTaniya Das global_pdev = pdev; 2662849dd8bSTaniya Das 2672849dd8bSTaniya Das ret = cpufreq_register_driver(&cpufreq_qcom_hw_driver); 2682849dd8bSTaniya Das if (ret) 2692849dd8bSTaniya Das dev_err(&pdev->dev, "CPUFreq HW driver failed to register\n"); 2702849dd8bSTaniya Das else 2712849dd8bSTaniya Das dev_dbg(&pdev->dev, "QCOM CPUFreq HW driver initialized\n"); 2722849dd8bSTaniya Das 2732849dd8bSTaniya Das return ret; 2742849dd8bSTaniya Das } 2752849dd8bSTaniya Das 2762849dd8bSTaniya Das static int qcom_cpufreq_hw_driver_remove(struct platform_device *pdev) 2772849dd8bSTaniya Das { 2782849dd8bSTaniya Das return cpufreq_unregister_driver(&cpufreq_qcom_hw_driver); 2792849dd8bSTaniya Das } 2802849dd8bSTaniya Das 2812849dd8bSTaniya Das static const struct of_device_id qcom_cpufreq_hw_match[] = { 2822849dd8bSTaniya Das { .compatible = "qcom,cpufreq-hw" }, 2832849dd8bSTaniya Das {} 2842849dd8bSTaniya Das }; 2852849dd8bSTaniya Das MODULE_DEVICE_TABLE(of, qcom_cpufreq_hw_match); 2862849dd8bSTaniya Das 2872849dd8bSTaniya Das static struct platform_driver qcom_cpufreq_hw_driver = { 2882849dd8bSTaniya Das .probe = qcom_cpufreq_hw_driver_probe, 2892849dd8bSTaniya Das .remove = qcom_cpufreq_hw_driver_remove, 2902849dd8bSTaniya Das .driver = { 2912849dd8bSTaniya Das .name = "qcom-cpufreq-hw", 2922849dd8bSTaniya Das .of_match_table = qcom_cpufreq_hw_match, 2932849dd8bSTaniya Das }, 2942849dd8bSTaniya Das }; 2952849dd8bSTaniya Das 2962849dd8bSTaniya Das static int __init qcom_cpufreq_hw_init(void) 2972849dd8bSTaniya Das { 2982849dd8bSTaniya Das return platform_driver_register(&qcom_cpufreq_hw_driver); 2992849dd8bSTaniya Das } 3002849dd8bSTaniya Das subsys_initcall(qcom_cpufreq_hw_init); 3012849dd8bSTaniya Das 3022849dd8bSTaniya Das static void __exit qcom_cpufreq_hw_exit(void) 3032849dd8bSTaniya Das { 3042849dd8bSTaniya Das platform_driver_unregister(&qcom_cpufreq_hw_driver); 3052849dd8bSTaniya Das } 3062849dd8bSTaniya Das module_exit(qcom_cpufreq_hw_exit); 3072849dd8bSTaniya Das 3082849dd8bSTaniya Das MODULE_DESCRIPTION("QCOM CPUFREQ HW Driver"); 3092849dd8bSTaniya Das MODULE_LICENSE("GPL v2"); 310