1 /* 2 * Altera Arria10 DevKit System Resource MFD Driver 3 * 4 * Author: Thor Thayer <tthayer@opensource.altera.com> 5 * 6 * Copyright Intel Corporation (C) 2014-2016. All Rights Reserved 7 * 8 * This program is free software; you can redistribute it and/or modify it 9 * under the terms and conditions of the GNU General Public License, 10 * version 2, as published by the Free Software Foundation. 11 * 12 * This program is distributed in the hope it will be useful, but WITHOUT 13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 15 * more details. 16 * 17 * You should have received a copy of the GNU General Public License along with 18 * this program. If not, see <http://www.gnu.org/licenses/>. 19 * 20 * SPI access for Altera Arria10 MAX5 System Resource Chip 21 * 22 * Adapted from DA9052 23 */ 24 25 #include <linux/mfd/altera-a10sr.h> 26 #include <linux/mfd/core.h> 27 #include <linux/init.h> 28 #include <linux/of.h> 29 #include <linux/spi/spi.h> 30 31 static const struct mfd_cell altr_a10sr_subdev_info[] = { 32 { 33 .name = "altr_a10sr_gpio", 34 .of_compatible = "altr,a10sr-gpio", 35 }, 36 }; 37 38 static bool altr_a10sr_reg_readable(struct device *dev, unsigned int reg) 39 { 40 switch (reg) { 41 case ALTR_A10SR_VERSION_READ: 42 case ALTR_A10SR_LED_REG: 43 case ALTR_A10SR_PBDSW_REG: 44 case ALTR_A10SR_PBDSW_IRQ_REG: 45 case ALTR_A10SR_PWR_GOOD1_REG: 46 case ALTR_A10SR_PWR_GOOD2_REG: 47 case ALTR_A10SR_PWR_GOOD3_REG: 48 case ALTR_A10SR_FMCAB_REG: 49 case ALTR_A10SR_HPS_RST_REG: 50 case ALTR_A10SR_USB_QSPI_REG: 51 case ALTR_A10SR_SFPA_REG: 52 case ALTR_A10SR_SFPB_REG: 53 case ALTR_A10SR_I2C_M_REG: 54 case ALTR_A10SR_WARM_RST_REG: 55 case ALTR_A10SR_WR_KEY_REG: 56 case ALTR_A10SR_PMBUS_REG: 57 return true; 58 default: 59 return false; 60 } 61 } 62 63 static bool altr_a10sr_reg_writeable(struct device *dev, unsigned int reg) 64 { 65 switch (reg) { 66 case ALTR_A10SR_LED_REG: 67 case ALTR_A10SR_PBDSW_IRQ_REG: 68 case ALTR_A10SR_FMCAB_REG: 69 case ALTR_A10SR_HPS_RST_REG: 70 case ALTR_A10SR_USB_QSPI_REG: 71 case ALTR_A10SR_SFPA_REG: 72 case ALTR_A10SR_SFPB_REG: 73 case ALTR_A10SR_WARM_RST_REG: 74 case ALTR_A10SR_WR_KEY_REG: 75 case ALTR_A10SR_PMBUS_REG: 76 return true; 77 default: 78 return false; 79 } 80 } 81 82 static bool altr_a10sr_reg_volatile(struct device *dev, unsigned int reg) 83 { 84 switch (reg) { 85 case ALTR_A10SR_PBDSW_REG: 86 case ALTR_A10SR_PBDSW_IRQ_REG: 87 case ALTR_A10SR_PWR_GOOD1_REG: 88 case ALTR_A10SR_PWR_GOOD2_REG: 89 case ALTR_A10SR_PWR_GOOD3_REG: 90 case ALTR_A10SR_HPS_RST_REG: 91 case ALTR_A10SR_I2C_M_REG: 92 case ALTR_A10SR_WARM_RST_REG: 93 case ALTR_A10SR_WR_KEY_REG: 94 case ALTR_A10SR_PMBUS_REG: 95 return true; 96 default: 97 return false; 98 } 99 } 100 101 static const struct regmap_config altr_a10sr_regmap_config = { 102 .reg_bits = 8, 103 .val_bits = 8, 104 105 .cache_type = REGCACHE_NONE, 106 107 .use_single_rw = true, 108 .read_flag_mask = 1, 109 .write_flag_mask = 0, 110 111 .max_register = ALTR_A10SR_WR_KEY_REG, 112 .readable_reg = altr_a10sr_reg_readable, 113 .writeable_reg = altr_a10sr_reg_writeable, 114 .volatile_reg = altr_a10sr_reg_volatile, 115 116 }; 117 118 static int altr_a10sr_spi_probe(struct spi_device *spi) 119 { 120 int ret; 121 struct altr_a10sr *a10sr; 122 123 a10sr = devm_kzalloc(&spi->dev, sizeof(*a10sr), 124 GFP_KERNEL); 125 if (!a10sr) 126 return -ENOMEM; 127 128 spi->mode = SPI_MODE_3; 129 spi->bits_per_word = 8; 130 spi_setup(spi); 131 132 a10sr->dev = &spi->dev; 133 134 spi_set_drvdata(spi, a10sr); 135 136 a10sr->regmap = devm_regmap_init_spi(spi, &altr_a10sr_regmap_config); 137 if (IS_ERR(a10sr->regmap)) { 138 ret = PTR_ERR(a10sr->regmap); 139 dev_err(&spi->dev, "Failed to allocate register map: %d\n", 140 ret); 141 return ret; 142 } 143 144 ret = devm_mfd_add_devices(a10sr->dev, PLATFORM_DEVID_AUTO, 145 altr_a10sr_subdev_info, 146 ARRAY_SIZE(altr_a10sr_subdev_info), 147 NULL, 0, NULL); 148 if (ret) 149 dev_err(a10sr->dev, "Failed to register sub-devices: %d\n", 150 ret); 151 152 return ret; 153 } 154 155 static const struct of_device_id altr_a10sr_spi_of_match[] = { 156 { .compatible = "altr,a10sr" }, 157 { }, 158 }; 159 160 static struct spi_driver altr_a10sr_spi_driver = { 161 .probe = altr_a10sr_spi_probe, 162 .driver = { 163 .name = "altr_a10sr", 164 .of_match_table = of_match_ptr(altr_a10sr_spi_of_match), 165 }, 166 }; 167 builtin_driver(altr_a10sr_spi_driver, spi_register_driver) 168