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