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/module.h>
  18 #include <linux/of.h>
  19 #include <linux/spi/spi.h>
  20
  21 static const struct mfd_cell altr_a10sr_subdev_info[] = {
  22         {
  23                 .name = "altr_a10sr_gpio",
  24                 .of_compatible = "altr,a10sr-gpio",
  25         },
  26         {
  27                 .name = "altr_a10sr_reset",
  28                 .of_compatible = "altr,a10sr-reset",
  29         },
  30 };
  31
  32 static bool altr_a10sr_reg_readable(struct device *dev, unsigned int reg)
  33 {
  34         switch (reg) {
  35         case ALTR_A10SR_VERSION_READ:
  36         case ALTR_A10SR_LED_REG:
  37         case ALTR_A10SR_PBDSW_REG:
  38         case ALTR_A10SR_PBDSW_IRQ_REG:
  39         case ALTR_A10SR_PWR_GOOD1_REG:
  40         case ALTR_A10SR_PWR_GOOD2_REG:
  41         case ALTR_A10SR_PWR_GOOD3_REG:
  42         case ALTR_A10SR_FMCAB_REG:
  43         case ALTR_A10SR_HPS_RST_REG:
  44         case ALTR_A10SR_USB_QSPI_REG:
  45         case ALTR_A10SR_SFPA_REG:
  46         case ALTR_A10SR_SFPB_REG:
  47         case ALTR_A10SR_I2C_M_REG:
  48         case ALTR_A10SR_WARM_RST_REG:
  49         case ALTR_A10SR_WR_KEY_REG:
  50         case ALTR_A10SR_PMBUS_REG:
  51                 return true;
  52         default:
  53                 return false;
  54         }
  55 }
  56
  57 static bool altr_a10sr_reg_writeable(struct device *dev, unsigned int reg)
  58 {
  59         switch (reg) {
  60         case ALTR_A10SR_LED_REG:
  61         case ALTR_A10SR_PBDSW_IRQ_REG:
  62         case ALTR_A10SR_FMCAB_REG:
  63         case ALTR_A10SR_HPS_RST_REG:
  64         case ALTR_A10SR_USB_QSPI_REG:
  65         case ALTR_A10SR_SFPA_REG:
  66         case ALTR_A10SR_SFPB_REG:
  67         case ALTR_A10SR_WARM_RST_REG:
  68         case ALTR_A10SR_WR_KEY_REG:
  69         case ALTR_A10SR_PMBUS_REG:
  70                 return true;
  71         default:
  72                 return false;
  73         }
  74 }
  75
  76 static bool altr_a10sr_reg_volatile(struct device *dev, unsigned int reg)
  77 {
  78         switch (reg) {
  79         case ALTR_A10SR_PBDSW_REG:
  80         case ALTR_A10SR_PBDSW_IRQ_REG:
  81         case ALTR_A10SR_PWR_GOOD1_REG:
  82         case ALTR_A10SR_PWR_GOOD2_REG:
  83         case ALTR_A10SR_PWR_GOOD3_REG:
  84         case ALTR_A10SR_HPS_RST_REG:
  85         case ALTR_A10SR_I2C_M_REG:
  86         case ALTR_A10SR_WARM_RST_REG:
  87         case ALTR_A10SR_WR_KEY_REG:
  88         case ALTR_A10SR_PMBUS_REG:
  89                 return true;
  90         default:
  91                 return false;
  92         }
  93 }
  94
  95 static const struct regmap_config altr_a10sr_regmap_config = {
  96         .reg_bits = 8,
  97         .val_bits = 8,
  98
  99         .cache_type = REGCACHE_NONE,
 100
 101         .use_single_read = true,
 102         .use_single_write = true,
 103         .read_flag_mask = 1,
 104         .write_flag_mask = 0,
 105
 106         .max_register = ALTR_A10SR_WR_KEY_REG,
 107         .readable_reg = altr_a10sr_reg_readable,
 108         .writeable_reg = altr_a10sr_reg_writeable,
 109         .volatile_reg = altr_a10sr_reg_volatile,
 110
 111 };
 112
 113 static int altr_a10sr_spi_probe(struct spi_device *spi)
 114 {
 115         int ret;
 116         struct altr_a10sr *a10sr;
 117
 118         a10sr = devm_kzalloc(&spi->dev, sizeof(*a10sr),
 119                              GFP_KERNEL);
 120         if (!a10sr)
 121                 return -ENOMEM;
 122
 123         spi->mode = SPI_MODE_3;
 124         spi->bits_per_word = 8;
 125         spi_setup(spi);
 126
 127         a10sr->dev = &spi->dev;
 128
 129         spi_set_drvdata(spi, a10sr);
 130
 131         a10sr->regmap = devm_regmap_init_spi(spi, &altr_a10sr_regmap_config);
 132         if (IS_ERR(a10sr->regmap)) {
 133                 ret = PTR_ERR(a10sr->regmap);
 134                 dev_err(&spi->dev, "Failed to allocate register map: %d\n",
 135                         ret);
 136                 return ret;
 137         }
 138
 139         ret = devm_mfd_add_devices(a10sr->dev, PLATFORM_DEVID_AUTO,
 140                                    altr_a10sr_subdev_info,
 141                                    ARRAY_SIZE(altr_a10sr_subdev_info),
 142                                    NULL, 0, NULL);
 143         if (ret)
 144                 dev_err(a10sr->dev, "Failed to register sub-devices: %d\n",
 145                         ret);
 146
 147         return ret;
 148 }
 149
 150 static const struct of_device_id altr_a10sr_spi_of_match[] = {
 151         { .compatible = "altr,a10sr" },
 152         { },
 153 };
 154 MODULE_DEVICE_TABLE(of, altr_a10sr_spi_of_match);
 155
 156 static const struct spi_device_id altr_a10sr_spi_ids[] = {
 157         { .name = "a10sr" },
 158         { },
 159 };
 160 MODULE_DEVICE_TABLE(spi, altr_a10sr_spi_ids);
 161
 162 static struct spi_driver altr_a10sr_spi_driver = {
 163         .probe = altr_a10sr_spi_probe,
 164         .driver = {
 165                 .name = "altr_a10sr",
 166                 .of_match_table = of_match_ptr(altr_a10sr_spi_of_match),
 167         },
 168         .id_table = altr_a10sr_spi_ids,
 169 };
 170 builtin_driver(altr_a10sr_spi_driver, spi_register_driver)