drivers/irqchip/irq-st.c

   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         const struct of_device_id *match;
 157         struct st_irq_syscfg *ddata;
 158
 159         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 160         if (!ddata)
 161                 return -ENOMEM;
 162
 163         match = of_match_device(st_irq_syscfg_match, &pdev->dev);
 164         if (!match)
 165                 return -ENODEV;
 166
 167         ddata->syscfg = (unsigned int)match->data;
 168
 169         ddata->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
 170         if (IS_ERR(ddata->regmap)) {
 171                 dev_err(&pdev->dev, "syscfg phandle missing\n");
 172                 return PTR_ERR(ddata->regmap);
 173         }
 174
 175         dev_set_drvdata(&pdev->dev, ddata);
 176
 177         return st_irq_syscfg_enable(pdev);
 178 }
 179
 180 static int __maybe_unused st_irq_syscfg_resume(struct device *dev)
 181 {
 182         struct st_irq_syscfg *ddata = dev_get_drvdata(dev);
 183
 184         return regmap_update_bits(ddata->regmap, ddata->syscfg,
 185                                   ST_A9_IRQ_MASK, ddata->config);
 186 }
 187
 188 static SIMPLE_DEV_PM_OPS(st_irq_syscfg_pm_ops, NULL, st_irq_syscfg_resume);
 189
 190 static struct platform_driver st_irq_syscfg_driver = {
 191         .driver = {
 192                 .name = "st_irq_syscfg",
 193                 .pm = &st_irq_syscfg_pm_ops,
 194                 .of_match_table = st_irq_syscfg_match,
 195         },
 196         .probe = st_irq_syscfg_probe,
 197 };
 198
 199 static int __init st_irq_syscfg_init(void)
 200 {
 201         return platform_driver_register(&st_irq_syscfg_driver);
 202 }
 203 core_initcall(st_irq_syscfg_init);