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.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);