drivers/mfd/intel_soc_pmic_mrfld.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Device access for Basin Cove PMIC
   4  *
   5  * Copyright (c) 2019, Intel Corporation.
   6  * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
   7  */
   8
   9 #include <linux/acpi.h>
  10 #include <linux/interrupt.h>
  11 #include <linux/mfd/core.h>
  12 #include <linux/mfd/intel_soc_pmic.h>
  13 #include <linux/mfd/intel_soc_pmic_mrfld.h>
  14 #include <linux/module.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/regmap.h>
  17
  18 #include <asm/intel_scu_ipc.h>
  19
  20 /*
  21  * Level 2 IRQs
  22  *
  23  * Firmware on the systems with Basin Cove PMIC services Level 1 IRQs
  24  * without an assistance. Thus, each of the Level 1 IRQ is represented
  25  * as a separate RTE in IOAPIC.
  26  */
  27 static struct resource irq_level2_resources[] = {
  28         DEFINE_RES_IRQ(0), /* power button */
  29         DEFINE_RES_IRQ(0), /* TMU */
  30         DEFINE_RES_IRQ(0), /* thermal */
  31         DEFINE_RES_IRQ(0), /* BCU */
  32         DEFINE_RES_IRQ(0), /* ADC */
  33         DEFINE_RES_IRQ(0), /* charger */
  34         DEFINE_RES_IRQ(0), /* GPIO */
  35 };
  36
  37 static const struct mfd_cell bcove_dev[] = {
  38         {
  39                 .name = "mrfld_bcove_pwrbtn",
  40                 .num_resources = 1,
  41                 .resources = &irq_level2_resources[0],
  42         }, {
  43                 .name = "mrfld_bcove_tmu",
  44                 .num_resources = 1,
  45                 .resources = &irq_level2_resources[1],
  46         }, {
  47                 .name = "mrfld_bcove_thermal",
  48                 .num_resources = 1,
  49                 .resources = &irq_level2_resources[2],
  50         }, {
  51                 .name = "mrfld_bcove_bcu",
  52                 .num_resources = 1,
  53                 .resources = &irq_level2_resources[3],
  54         }, {
  55                 .name = "mrfld_bcove_adc",
  56                 .num_resources = 1,
  57                 .resources = &irq_level2_resources[4],
  58         }, {
  59                 .name = "mrfld_bcove_charger",
  60                 .num_resources = 1,
  61                 .resources = &irq_level2_resources[5],
  62         }, {
  63                 .name = "mrfld_bcove_pwrsrc",
  64                 .num_resources = 1,
  65                 .resources = &irq_level2_resources[5],
  66         }, {
  67                 .name = "mrfld_bcove_gpio",
  68                 .num_resources = 1,
  69                 .resources = &irq_level2_resources[6],
  70         },
  71         {       .name = "mrfld_bcove_region", },
  72 };
  73
  74 static int bcove_ipc_byte_reg_read(void *context, unsigned int reg,
  75                                     unsigned int *val)
  76 {
  77         u8 ipc_out;
  78         int ret;
  79
  80         ret = intel_scu_ipc_ioread8(reg, &ipc_out);
  81         if (ret)
  82                 return ret;
  83
  84         *val = ipc_out;
  85         return 0;
  86 }
  87
  88 static int bcove_ipc_byte_reg_write(void *context, unsigned int reg,
  89                                      unsigned int val)
  90 {
  91         u8 ipc_in = val;
  92         int ret;
  93
  94         ret = intel_scu_ipc_iowrite8(reg, ipc_in);
  95         if (ret)
  96                 return ret;
  97
  98         return 0;
  99 }
 100
 101 static const struct regmap_config bcove_regmap_config = {
 102         .reg_bits = 16,
 103         .val_bits = 8,
 104         .max_register = 0xff,
 105         .reg_write = bcove_ipc_byte_reg_write,
 106         .reg_read = bcove_ipc_byte_reg_read,
 107 };
 108
 109 static int bcove_probe(struct platform_device *pdev)
 110 {
 111         struct device *dev = &pdev->dev;
 112         struct intel_soc_pmic *pmic;
 113         unsigned int i;
 114         int ret;
 115
 116         pmic = devm_kzalloc(dev, sizeof(*pmic), GFP_KERNEL);
 117         if (!pmic)
 118                 return -ENOMEM;
 119
 120         platform_set_drvdata(pdev, pmic);
 121         pmic->dev = &pdev->dev;
 122
 123         pmic->regmap = devm_regmap_init(dev, NULL, pmic, &bcove_regmap_config);
 124         if (IS_ERR(pmic->regmap))
 125                 return PTR_ERR(pmic->regmap);
 126
 127         for (i = 0; i < ARRAY_SIZE(irq_level2_resources); i++) {
 128                 ret = platform_get_irq(pdev, i);
 129                 if (ret < 0)
 130                         return ret;
 131
 132                 irq_level2_resources[i].start = ret;
 133                 irq_level2_resources[i].end = ret;
 134         }
 135
 136         return devm_mfd_add_devices(dev, PLATFORM_DEVID_NONE,
 137                                     bcove_dev, ARRAY_SIZE(bcove_dev),
 138                                     NULL, 0, NULL);
 139 }
 140
 141 static const struct acpi_device_id bcove_acpi_ids[] = {
 142         { "INTC100E" },
 143         {}
 144 };
 145 MODULE_DEVICE_TABLE(acpi, bcove_acpi_ids);
 146
 147 static struct platform_driver bcove_driver = {
 148         .driver = {
 149                 .name = "intel_soc_pmic_mrfld",
 150                 .acpi_match_table = bcove_acpi_ids,
 151         },
 152         .probe = bcove_probe,
 153 };
 154 module_platform_driver(bcove_driver);
 155
 156 MODULE_DESCRIPTION("IPC driver for Intel SoC Basin Cove PMIC");
 157 MODULE_LICENSE("GPL v2");