drivers/irqchip/irq-st.c

   1 /*
   2  *  Copyright (C) 2014 STMicroelectronics – All Rights Reserved
   3  *
   4  *  Author: Lee Jones <lee.jones@linaro.org>
   5  *
   6  *  This is a re-write of Christophe Kerello's PMU driver.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  */
  12
  13 #include <dt-bindings/interrupt-controller/irq-st.h>
  14 #include <linux/err.h>
  15 #include <linux/mfd/syscon.h>
  16 #include <linux/of_device.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/regmap.h>
  19 #include <linux/slab.h>
  20
  21 #define STIH415_SYSCFG_642              0x0a8
  22 #define STIH416_SYSCFG_7543             0x87c
  23 #define STIH407_SYSCFG_5102             0x198
  24 #define STID127_SYSCFG_734              0x088
  25
  26 #define ST_A9_IRQ_MASK                  0x001FFFFF
  27 #define ST_A9_IRQ_MAX_CHANS             2
  28
  29 #define ST_A9_IRQ_EN_CTI_0              BIT(0)
  30 #define ST_A9_IRQ_EN_CTI_1              BIT(1)
  31 #define ST_A9_IRQ_EN_PMU_0              BIT(2)
  32 #define ST_A9_IRQ_EN_PMU_1              BIT(3)
  33 #define ST_A9_IRQ_EN_PL310_L2           BIT(4)
  34 #define ST_A9_IRQ_EN_EXT_0              BIT(5)
  35 #define ST_A9_IRQ_EN_EXT_1              BIT(6)
  36 #define ST_A9_IRQ_EN_EXT_2              BIT(7)
  37
  38 #define ST_A9_FIQ_N_SEL(dev, chan)      (dev << (8  + (chan * 3)))
  39 #define ST_A9_IRQ_N_SEL(dev, chan)      (dev << (14 + (chan * 3)))
  40 #define ST_A9_EXTIRQ_INV_SEL(dev)       (dev << 20)
  41
  42 struct st_irq_syscfg {
  43         struct regmap *regmap;
  44         unsigned int syscfg;
  45         unsigned int config;
  46         bool ext_inverted;
  47 };
  48
  49 static const struct of_device_id st_irq_syscfg_match[] = {
  50         {
  51                 .compatible = "st,stih415-irq-syscfg",
  52                 .data = (void *)STIH415_SYSCFG_642,
  53         },
  54         {
  55                 .compatible = "st,stih416-irq-syscfg",
  56                 .data = (void *)STIH416_SYSCFG_7543,
  57         },
  58         {
  59                 .compatible = "st,stih407-irq-syscfg",
  60                 .data = (void *)STIH407_SYSCFG_5102,
  61         },
  62         {
  63                 .compatible = "st,stid127-irq-syscfg",
  64                 .data = (void *)STID127_SYSCFG_734,
  65         },
  66         {}
  67 };
  68
  69 static int st_irq_xlate(struct platform_device *pdev,
  70                         int device, int channel, bool irq)
  71 {
  72         struct st_irq_syscfg *ddata = dev_get_drvdata(&pdev->dev);
  73
  74         /* Set the device enable bit. */
  75         switch (device) {
  76         case ST_IRQ_SYSCFG_EXT_0:
  77                 ddata->config |= ST_A9_IRQ_EN_EXT_0;
  78                 break;
  79         case ST_IRQ_SYSCFG_EXT_1:
  80                 ddata->config |= ST_A9_IRQ_EN_EXT_1;
  81                 break;
  82         case ST_IRQ_SYSCFG_EXT_2:
  83                 ddata->config |= ST_A9_IRQ_EN_EXT_2;
  84                 break;
  85         case ST_IRQ_SYSCFG_CTI_0:
  86                 ddata->config |= ST_A9_IRQ_EN_CTI_0;
  87                 break;
  88         case ST_IRQ_SYSCFG_CTI_1:
  89                 ddata->config |= ST_A9_IRQ_EN_CTI_1;
  90                 break;
  91         case ST_IRQ_SYSCFG_PMU_0:
  92                 ddata->config |= ST_A9_IRQ_EN_PMU_0;
  93                 break;
  94         case ST_IRQ_SYSCFG_PMU_1:
  95                 ddata->config |= ST_A9_IRQ_EN_PMU_1;
  96                 break;
  97         case ST_IRQ_SYSCFG_pl310_L2:
  98                 ddata->config |= ST_A9_IRQ_EN_PL310_L2;
  99                 break;
 100         case ST_IRQ_SYSCFG_DISABLED:
 101                 return 0;
 102         default:
 103                 dev_err(&pdev->dev, "Unrecognised device %d\n", device);
 104                 return -EINVAL;
 105         }
 106
 107         /* Select IRQ/FIQ channel for device. */
 108         ddata->config |= irq ?
 109                 ST_A9_IRQ_N_SEL(device, channel) :
 110                 ST_A9_FIQ_N_SEL(device, channel);
 111
 112         return 0;
 113 }
 114
 115 static int st_irq_syscfg_enable(struct platform_device *pdev)
 116 {
 117         struct device_node *np = pdev->dev.of_node;
 118         struct st_irq_syscfg *ddata = dev_get_drvdata(&pdev->dev);
 119         int channels, ret, i;
 120         u32 device, invert;
 121
 122         channels = of_property_count_u32_elems(np, "st,irq-device");
 123         if (channels != ST_A9_IRQ_MAX_CHANS) {
 124                 dev_err(&pdev->dev, "st,enable-irq-device must have 2 elems\n");
 125                 return -EINVAL;
 126         }
 127
 128         channels = of_property_count_u32_elems(np, "st,fiq-device");
 129         if (channels != ST_A9_IRQ_MAX_CHANS) {
 130                 dev_err(&pdev->dev, "st,enable-fiq-device must have 2 elems\n");
 131                 return -EINVAL;
 132         }
 133
 134         for (i = 0; i < ST_A9_IRQ_MAX_CHANS; i++) {
 135                 of_property_read_u32_index(np, "st,irq-device", i, &device);
 136
 137                 ret = st_irq_xlate(pdev, device, i, true);
 138                 if (ret)
 139                         return ret;
 140
 141                 of_property_read_u32_index(np, "st,fiq-device", i, &device);
 142
 143                 ret = st_irq_xlate(pdev, device, i, false);
 144                 if (ret)
 145                         return ret;
 146         }
 147
 148         /* External IRQs may be inverted. */
 149         of_property_read_u32(np, "st,invert-ext", &invert);
 150         ddata->config |= ST_A9_EXTIRQ_INV_SEL(invert);
 151
 152         return regmap_update_bits(ddata->regmap, ddata->syscfg,
 153                                   ST_A9_IRQ_MASK, ddata->config);
 154 }
 155
 156 static int st_irq_syscfg_probe(struct platform_device *pdev)
 157 {
 158         struct device_node *np = pdev->dev.of_node;
 159         const struct of_device_id *match;
 160         struct st_irq_syscfg *ddata;
 161
 162         ddata = devm_kzalloc(&pdev->dev, sizeof(*ddata), GFP_KERNEL);
 163         if (!ddata)
 164                 return -ENOMEM;
 165
 166         match = of_match_device(st_irq_syscfg_match, &pdev->dev);
 167         if (!match)
 168                 return -ENODEV;
 169
 170         ddata->syscfg = (unsigned int)match->data;
 171
 172         ddata->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscfg");
 173         if (IS_ERR(ddata->regmap)) {
 174                 dev_err(&pdev->dev, "syscfg phandle missing\n");
 175                 return PTR_ERR(ddata->regmap);
 176         }
 177
 178         dev_set_drvdata(&pdev->dev, ddata);
 179
 180         return st_irq_syscfg_enable(pdev);
 181 }
 182
 183 static int __maybe_unused st_irq_syscfg_resume(struct device *dev)
 184 {
 185         struct st_irq_syscfg *ddata = dev_get_drvdata(dev);
 186
 187         return regmap_update_bits(ddata->regmap, ddata->syscfg,
 188                                   ST_A9_IRQ_MASK, ddata->config);
 189 }
 190
 191 static SIMPLE_DEV_PM_OPS(st_irq_syscfg_pm_ops, NULL, st_irq_syscfg_resume);
 192
 193 static struct platform_driver st_irq_syscfg_driver = {
 194         .driver = {
 195                 .name = "st_irq_syscfg",
 196                 .pm = &st_irq_syscfg_pm_ops,
 197                 .of_match_table = st_irq_syscfg_match,
 198         },
 199         .probe = st_irq_syscfg_probe,
 200 };
 201
 202 static int __init st_irq_syscfg_init(void)
 203 {
 204         return platform_driver_register(&st_irq_syscfg_driver);
 205 }
 206 core_initcall(st_irq_syscfg_init);