1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2014 STMicroelectronics – All Rights Reserved 4 * 5 * Author: Lee Jones <lee.jones@linaro.org> 6 * 7 * This is a re-write of Christophe Kerello's PMU driver. 8 */ 9 10 #include <dt-bindings/interrupt-controller/irq-st.h> 11 #include <linux/err.h> 12 #include <linux/mfd/syscon.h> 13 #include <linux/of_device.h> 14 #include <linux/platform_device.h> 15 #include <linux/regmap.h> 16 #include <linux/slab.h> 17 18 #define STIH415_SYSCFG_642 0x0a8 19 #define STIH416_SYSCFG_7543 0x87c 20 #define STIH407_SYSCFG_5102 0x198 21 #define STID127_SYSCFG_734 0x088 22 23 #define ST_A9_IRQ_MASK 0x001FFFFF 24 #define ST_A9_IRQ_MAX_CHANS 2 25 26 #define ST_A9_IRQ_EN_CTI_0 BIT(0) 27 #define ST_A9_IRQ_EN_CTI_1 BIT(1) 28 #define ST_A9_IRQ_EN_PMU_0 BIT(2) 29 #define ST_A9_IRQ_EN_PMU_1 BIT(3) 30 #define ST_A9_IRQ_EN_PL310_L2 BIT(4) 31 #define ST_A9_IRQ_EN_EXT_0 BIT(5) 32 #define ST_A9_IRQ_EN_EXT_1 BIT(6) 33 #define ST_A9_IRQ_EN_EXT_2 BIT(7) 34 35 #define ST_A9_FIQ_N_SEL(dev, chan) (dev << (8 + (chan * 3))) 36 #define ST_A9_IRQ_N_SEL(dev, chan) (dev << (14 + (chan * 3))) 37 #define ST_A9_EXTIRQ_INV_SEL(dev) (dev << 20) 38 39 struct st_irq_syscfg { 40 struct regmap *regmap; 41 unsigned int syscfg; 42 unsigned int config; 43 bool ext_inverted; 44 }; 45 46 static const struct of_device_id st_irq_syscfg_match[] = { 47 { 48 .compatible = "st,stih415-irq-syscfg", 49 .data = (void *)STIH415_SYSCFG_642, 50 }, 51 { 52 .compatible = "st,stih416-irq-syscfg", 53 .data = (void *)STIH416_SYSCFG_7543, 54 }, 55 { 56 .compatible = "st,stih407-irq-syscfg", 57 .data = (void *)STIH407_SYSCFG_5102, 58 }, 59 { 60 .compatible = "st,stid127-irq-syscfg", 61 .data = (void *)STID127_SYSCFG_734, 62 }, 63 {} 64 }; 65 66 static int st_irq_xlate(struct platform_device *pdev, 67 int device, int channel, bool irq) 68 { 69 struct st_irq_syscfg *ddata = dev_get_drvdata(&pdev->dev); 70 71 /* Set the device enable bit. */ 72 switch (device) { 73 case ST_IRQ_SYSCFG_EXT_0: 74 ddata->config |= ST_A9_IRQ_EN_EXT_0; 75 break; 76 case ST_IRQ_SYSCFG_EXT_1: 77 ddata->config |= ST_A9_IRQ_EN_EXT_1; 78 break; 79 case ST_IRQ_SYSCFG_EXT_2: 80 ddata->config |= ST_A9_IRQ_EN_EXT_2; 81 break; 82 case ST_IRQ_SYSCFG_CTI_0: 83 ddata->config |= ST_A9_IRQ_EN_CTI_0; 84 break; 85 case ST_IRQ_SYSCFG_CTI_1: 86 ddata->config |= ST_A9_IRQ_EN_CTI_1; 87 break; 88 case ST_IRQ_SYSCFG_PMU_0: 89 ddata->config |= ST_A9_IRQ_EN_PMU_0; 90 break; 91 case ST_IRQ_SYSCFG_PMU_1: 92 ddata->config |= ST_A9_IRQ_EN_PMU_1; 93 break; 94 case ST_IRQ_SYSCFG_pl310_L2: 95 ddata->config |= ST_A9_IRQ_EN_PL310_L2; 96 break; 97 case ST_IRQ_SYSCFG_DISABLED: 98 return 0; 99 default: 100 dev_err(&pdev->dev, "Unrecognised device %d\n", device); 101 return -EINVAL; 102 } 103 104 /* Select IRQ/FIQ channel for device. */ 105 ddata->config |= irq ? 106 ST_A9_IRQ_N_SEL(device, channel) : 107 ST_A9_FIQ_N_SEL(device, channel); 108 109 return 0; 110 } 111 112 static int st_irq_syscfg_enable(struct platform_device *pdev) 113 { 114 struct device_node *np = pdev->dev.of_node; 115 struct st_irq_syscfg *ddata = dev_get_drvdata(&pdev->dev); 116 int channels, ret, i; 117 u32 device, invert; 118 119 channels = of_property_count_u32_elems(np, "st,irq-device"); 120 if (channels != ST_A9_IRQ_MAX_CHANS) { 121 dev_err(&pdev->dev, "st,enable-irq-device must have 2 elems\n"); 122 return -EINVAL; 123 } 124 125 channels = of_property_count_u32_elems(np, "st,fiq-device"); 126 if (channels != ST_A9_IRQ_MAX_CHANS) { 127 dev_err(&pdev->dev, "st,enable-fiq-device must have 2 elems\n"); 128 return -EINVAL; 129 } 130 131 for (i = 0; i < ST_A9_IRQ_MAX_CHANS; i++) { 132 of_property_read_u32_index(np, "st,irq-device", i, &device); 133 134 ret = st_irq_xlate(pdev, device, i, true); 135 if (ret) 136 return ret; 137 138 of_property_read_u32_index(np, "st,fiq-device", i, &device); 139 140 ret = st_irq_xlate(pdev, device, i, false); 141 if (ret) 142 return ret; 143 } 144 145 /* External IRQs may be inverted. */ 146 of_property_read_u32(np, "st,invert-ext", &invert); 147 ddata->config |= ST_A9_EXTIRQ_INV_SEL(invert); 148 149 return regmap_update_bits(ddata->regmap, ddata->syscfg, 150 ST_A9_IRQ_MASK, ddata->config); 151 } 152 153 static int st_irq_syscfg_probe(struct platform_device *pdev) 154 { 155 struct device_node *np = pdev->dev.of_node; 156 struct st_irq_syscfg *ddata; 157 158 ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL); 159 if (!ddata) 160 return -ENOMEM; 161 162 ddata->syscfg = (unsigned int) device_get_match_data(&pdev->dev); 163 164 ddata->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg"); 165 if (IS_ERR(ddata->regmap)) { 166 dev_err(&pdev->dev, "syscfg phandle missing\n"); 167 return PTR_ERR(ddata->regmap); 168 } 169 170 dev_set_drvdata(&pdev->dev, ddata); 171 172 return st_irq_syscfg_enable(pdev); 173 } 174 175 static int __maybe_unused st_irq_syscfg_resume(struct device *dev) 176 { 177 struct st_irq_syscfg *ddata = dev_get_drvdata(dev); 178 179 return regmap_update_bits(ddata->regmap, ddata->syscfg, 180 ST_A9_IRQ_MASK, ddata->config); 181 } 182 183 static SIMPLE_DEV_PM_OPS(st_irq_syscfg_pm_ops, NULL, st_irq_syscfg_resume); 184 185 static struct platform_driver st_irq_syscfg_driver = { 186 .driver = { 187 .name = "st_irq_syscfg", 188 .pm = &st_irq_syscfg_pm_ops, 189 .of_match_table = st_irq_syscfg_match, 190 }, 191 .probe = st_irq_syscfg_probe, 192 }; 193 194 static int __init st_irq_syscfg_init(void) 195 { 196 return platform_driver_register(&st_irq_syscfg_driver); 197 } 198 core_initcall(st_irq_syscfg_init); 199