1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright 2019 NXP 4 */ 5 6 #include <linux/clk.h> 7 #include <linux/cpu.h> 8 #include <linux/cpufreq.h> 9 #include <linux/err.h> 10 #include <linux/init.h> 11 #include <linux/kernel.h> 12 #include <linux/module.h> 13 #include <linux/nvmem-consumer.h> 14 #include <linux/of.h> 15 #include <linux/platform_device.h> 16 #include <linux/pm_opp.h> 17 #include <linux/regulator/consumer.h> 18 #include <linux/slab.h> 19 20 #include "cpufreq-dt.h" 21 22 #define OCOTP_CFG3_SPEED_GRADE_SHIFT 8 23 #define OCOTP_CFG3_SPEED_GRADE_MASK (0x3 << 8) 24 #define IMX8MN_OCOTP_CFG3_SPEED_GRADE_MASK (0xf << 8) 25 #define OCOTP_CFG3_MKT_SEGMENT_SHIFT 6 26 #define OCOTP_CFG3_MKT_SEGMENT_MASK (0x3 << 6) 27 #define IMX8MP_OCOTP_CFG3_MKT_SEGMENT_SHIFT 5 28 #define IMX8MP_OCOTP_CFG3_MKT_SEGMENT_MASK (0x3 << 5) 29 30 #define IMX7ULP_MAX_RUN_FREQ 528000 31 32 /* cpufreq-dt device registered by imx-cpufreq-dt */ 33 static struct platform_device *cpufreq_dt_pdev; 34 static struct device *cpu_dev; 35 static int cpufreq_opp_token; 36 37 enum IMX7ULP_CPUFREQ_CLKS { 38 ARM, 39 CORE, 40 SCS_SEL, 41 HSRUN_CORE, 42 HSRUN_SCS_SEL, 43 FIRC, 44 }; 45 46 static struct clk_bulk_data imx7ulp_clks[] = { 47 { .id = "arm" }, 48 { .id = "core" }, 49 { .id = "scs_sel" }, 50 { .id = "hsrun_core" }, 51 { .id = "hsrun_scs_sel" }, 52 { .id = "firc" }, 53 }; 54 55 static unsigned int imx7ulp_get_intermediate(struct cpufreq_policy *policy, 56 unsigned int index) 57 { 58 return clk_get_rate(imx7ulp_clks[FIRC].clk); 59 } 60 61 static int imx7ulp_target_intermediate(struct cpufreq_policy *policy, 62 unsigned int index) 63 { 64 unsigned int newfreq = policy->freq_table[index].frequency; 65 66 clk_set_parent(imx7ulp_clks[SCS_SEL].clk, imx7ulp_clks[FIRC].clk); 67 clk_set_parent(imx7ulp_clks[HSRUN_SCS_SEL].clk, imx7ulp_clks[FIRC].clk); 68 69 if (newfreq > IMX7ULP_MAX_RUN_FREQ) 70 clk_set_parent(imx7ulp_clks[ARM].clk, 71 imx7ulp_clks[HSRUN_CORE].clk); 72 else 73 clk_set_parent(imx7ulp_clks[ARM].clk, imx7ulp_clks[CORE].clk); 74 75 return 0; 76 } 77 78 static struct cpufreq_dt_platform_data imx7ulp_data = { 79 .target_intermediate = imx7ulp_target_intermediate, 80 .get_intermediate = imx7ulp_get_intermediate, 81 }; 82 83 static int imx_cpufreq_dt_probe(struct platform_device *pdev) 84 { 85 struct platform_device *dt_pdev; 86 u32 cell_value, supported_hw[2]; 87 int speed_grade, mkt_segment; 88 int ret; 89 90 cpu_dev = get_cpu_device(0); 91 92 if (!of_property_present(cpu_dev->of_node, "cpu-supply")) 93 return -ENODEV; 94 95 if (of_machine_is_compatible("fsl,imx7ulp")) { 96 ret = clk_bulk_get(cpu_dev, ARRAY_SIZE(imx7ulp_clks), 97 imx7ulp_clks); 98 if (ret) 99 return ret; 100 101 dt_pdev = platform_device_register_data(NULL, "cpufreq-dt", 102 -1, &imx7ulp_data, 103 sizeof(imx7ulp_data)); 104 if (IS_ERR(dt_pdev)) { 105 clk_bulk_put(ARRAY_SIZE(imx7ulp_clks), imx7ulp_clks); 106 ret = PTR_ERR(dt_pdev); 107 dev_err(&pdev->dev, "Failed to register cpufreq-dt: %d\n", ret); 108 return ret; 109 } 110 111 cpufreq_dt_pdev = dt_pdev; 112 113 return 0; 114 } 115 116 ret = nvmem_cell_read_u32(cpu_dev, "speed_grade", &cell_value); 117 if (ret) 118 return ret; 119 120 if (of_machine_is_compatible("fsl,imx8mn") || 121 of_machine_is_compatible("fsl,imx8mp")) 122 speed_grade = (cell_value & IMX8MN_OCOTP_CFG3_SPEED_GRADE_MASK) 123 >> OCOTP_CFG3_SPEED_GRADE_SHIFT; 124 else 125 speed_grade = (cell_value & OCOTP_CFG3_SPEED_GRADE_MASK) 126 >> OCOTP_CFG3_SPEED_GRADE_SHIFT; 127 128 if (of_machine_is_compatible("fsl,imx8mp")) 129 mkt_segment = (cell_value & IMX8MP_OCOTP_CFG3_MKT_SEGMENT_MASK) 130 >> IMX8MP_OCOTP_CFG3_MKT_SEGMENT_SHIFT; 131 else 132 mkt_segment = (cell_value & OCOTP_CFG3_MKT_SEGMENT_MASK) 133 >> OCOTP_CFG3_MKT_SEGMENT_SHIFT; 134 135 /* 136 * Early samples without fuses written report "0 0" which may NOT 137 * match any OPP defined in DT. So clamp to minimum OPP defined in 138 * DT to avoid warning for "no OPPs". 139 * 140 * Applies to i.MX8M series SoCs. 141 */ 142 if (mkt_segment == 0 && speed_grade == 0) { 143 if (of_machine_is_compatible("fsl,imx8mm") || 144 of_machine_is_compatible("fsl,imx8mq")) 145 speed_grade = 1; 146 if (of_machine_is_compatible("fsl,imx8mn") || 147 of_machine_is_compatible("fsl,imx8mp")) 148 speed_grade = 0xb; 149 } 150 151 supported_hw[0] = BIT(speed_grade); 152 supported_hw[1] = BIT(mkt_segment); 153 dev_info(&pdev->dev, "cpu speed grade %d mkt segment %d supported-hw %#x %#x\n", 154 speed_grade, mkt_segment, supported_hw[0], supported_hw[1]); 155 156 cpufreq_opp_token = dev_pm_opp_set_supported_hw(cpu_dev, supported_hw, 2); 157 if (cpufreq_opp_token < 0) { 158 ret = cpufreq_opp_token; 159 dev_err(&pdev->dev, "Failed to set supported opp: %d\n", ret); 160 return ret; 161 } 162 163 cpufreq_dt_pdev = platform_device_register_data( 164 &pdev->dev, "cpufreq-dt", -1, NULL, 0); 165 if (IS_ERR(cpufreq_dt_pdev)) { 166 dev_pm_opp_put_supported_hw(cpufreq_opp_token); 167 ret = PTR_ERR(cpufreq_dt_pdev); 168 dev_err(&pdev->dev, "Failed to register cpufreq-dt: %d\n", ret); 169 return ret; 170 } 171 172 return 0; 173 } 174 175 static void imx_cpufreq_dt_remove(struct platform_device *pdev) 176 { 177 platform_device_unregister(cpufreq_dt_pdev); 178 if (!of_machine_is_compatible("fsl,imx7ulp")) 179 dev_pm_opp_put_supported_hw(cpufreq_opp_token); 180 else 181 clk_bulk_put(ARRAY_SIZE(imx7ulp_clks), imx7ulp_clks); 182 } 183 184 static struct platform_driver imx_cpufreq_dt_driver = { 185 .probe = imx_cpufreq_dt_probe, 186 .remove_new = imx_cpufreq_dt_remove, 187 .driver = { 188 .name = "imx-cpufreq-dt", 189 }, 190 }; 191 module_platform_driver(imx_cpufreq_dt_driver); 192 193 MODULE_ALIAS("platform:imx-cpufreq-dt"); 194 MODULE_DESCRIPTION("Freescale i.MX cpufreq speed grading driver"); 195 MODULE_LICENSE("GPL v2"); 196