drivers/mfd/altera-a10sr.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Altera Arria10 DevKit System Resource MFD Driver
   4  *
   5  * Author: Thor Thayer <tthayer@opensource.altera.com>
   6  *
   7  * Copyright Intel Corporation (C) 2014-2016. All Rights Reserved
   8  *
   9  * SPI access for Altera Arria10 MAX5 System Resource Chip
  10  *
  11  * Adapted from DA9052
  12  */
  13
  14 #include <linux/mfd/altera-a10sr.h>
  15 #include <linux/mfd/core.h>
  16 #include <linux/init.h>
  17 #include <linux/of.h>
  18 #include <linux/spi/spi.h>
  19
  20 static const struct mfd_cell altr_a10sr_subdev_info[] = {
  21         {
  22                 .name = "altr_a10sr_gpio",
  23                 .of_compatible = "altr,a10sr-gpio",
  24         },
  25         {
  26                 .name = "altr_a10sr_reset",
  27                 .of_compatible = "altr,a10sr-reset",
  28         },
  29 };
  30
  31 static bool altr_a10sr_reg_readable(struct device *dev, unsigned int reg)
  32 {
  33         switch (reg) {
  34         case ALTR_A10SR_VERSION_READ:
  35         case ALTR_A10SR_LED_REG:
  36         case ALTR_A10SR_PBDSW_REG:
  37         case ALTR_A10SR_PBDSW_IRQ_REG:
  38         case ALTR_A10SR_PWR_GOOD1_REG:
  39         case ALTR_A10SR_PWR_GOOD2_REG:
  40         case ALTR_A10SR_PWR_GOOD3_REG:
  41         case ALTR_A10SR_FMCAB_REG:
  42         case ALTR_A10SR_HPS_RST_REG:
  43         case ALTR_A10SR_USB_QSPI_REG:
  44         case ALTR_A10SR_SFPA_REG:
  45         case ALTR_A10SR_SFPB_REG:
  46         case ALTR_A10SR_I2C_M_REG:
  47         case ALTR_A10SR_WARM_RST_REG:
  48         case ALTR_A10SR_WR_KEY_REG:
  49         case ALTR_A10SR_PMBUS_REG:
  50                 return true;
  51         default:
  52                 return false;
  53         }
  54 }
  55
  56 static bool altr_a10sr_reg_writeable(struct device *dev, unsigned int reg)
  57 {
  58         switch (reg) {
  59         case ALTR_A10SR_LED_REG:
  60         case ALTR_A10SR_PBDSW_IRQ_REG:
  61         case ALTR_A10SR_FMCAB_REG:
  62         case ALTR_A10SR_HPS_RST_REG:
  63         case ALTR_A10SR_USB_QSPI_REG:
  64         case ALTR_A10SR_SFPA_REG:
  65         case ALTR_A10SR_SFPB_REG:
  66         case ALTR_A10SR_WARM_RST_REG:
  67         case ALTR_A10SR_WR_KEY_REG:
  68         case ALTR_A10SR_PMBUS_REG:
  69                 return true;
  70         default:
  71                 return false;
  72         }
  73 }
  74
  75 static bool altr_a10sr_reg_volatile(struct device *dev, unsigned int reg)
  76 {
  77         switch (reg) {
  78         case ALTR_A10SR_PBDSW_REG:
  79         case ALTR_A10SR_PBDSW_IRQ_REG:
  80         case ALTR_A10SR_PWR_GOOD1_REG:
  81         case ALTR_A10SR_PWR_GOOD2_REG:
  82         case ALTR_A10SR_PWR_GOOD3_REG:
  83         case ALTR_A10SR_HPS_RST_REG:
  84         case ALTR_A10SR_I2C_M_REG:
  85         case ALTR_A10SR_WARM_RST_REG:
  86         case ALTR_A10SR_WR_KEY_REG:
  87         case ALTR_A10SR_PMBUS_REG:
  88                 return true;
  89         default:
  90                 return false;
  91         }
  92 }
  93
  94 static const struct regmap_config altr_a10sr_regmap_config = {
  95         .reg_bits = 8,
  96         .val_bits = 8,
  97
  98         .cache_type = REGCACHE_NONE,
  99
 100         .use_single_read = true,
 101         .use_single_write = true,
 102         .read_flag_mask = 1,
 103         .write_flag_mask = 0,
 104
 105         .max_register = ALTR_A10SR_WR_KEY_REG,
 106         .readable_reg = altr_a10sr_reg_readable,
 107         .writeable_reg = altr_a10sr_reg_writeable,
 108         .volatile_reg = altr_a10sr_reg_volatile,
 109
 110 };
 111
 112 static int altr_a10sr_spi_probe(struct spi_device *spi)
 113 {
 114         int ret;
 115         struct altr_a10sr *a10sr;
 116
 117         a10sr = devm_kzalloc(&spi->dev, sizeof(*a10sr),
 118                              GFP_KERNEL);
 119         if (!a10sr)
 120                 return -ENOMEM;
 121
 122         spi->mode = SPI_MODE_3;
 123         spi->bits_per_word = 8;
 124         spi_setup(spi);
 125
 126         a10sr->dev = &spi->dev;
 127
 128         spi_set_drvdata(spi, a10sr);
 129
 130         a10sr->regmap = devm_regmap_init_spi(spi, &altr_a10sr_regmap_config);
 131         if (IS_ERR(a10sr->regmap)) {
 132                 ret = PTR_ERR(a10sr->regmap);
 133                 dev_err(&spi->dev, "Failed to allocate register map: %d\n",
 134                         ret);
 135                 return ret;
 136         }
 137
 138         ret = devm_mfd_add_devices(a10sr->dev, PLATFORM_DEVID_AUTO,
 139                                    altr_a10sr_subdev_info,
 140                                    ARRAY_SIZE(altr_a10sr_subdev_info),
 141                                    NULL, 0, NULL);
 142         if (ret)
 143                 dev_err(a10sr->dev, "Failed to register sub-devices: %d\n",
 144                         ret);
 145
 146         return ret;
 147 }
 148
 149 static const struct of_device_id altr_a10sr_spi_of_match[] = {
 150         { .compatible = "altr,a10sr" },
 151         { },
 152 };
 153
 154 static struct spi_driver altr_a10sr_spi_driver = {
 155         .probe = altr_a10sr_spi_probe,
 156         .driver = {
 157                 .name = "altr_a10sr",
 158                 .of_match_table = of_match_ptr(altr_a10sr_spi_of_match),
 159         },
 160 };
 161 builtin_driver(altr_a10sr_spi_driver, spi_register_driver)