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 .name = "altr_a10sr_reset", 38 .of_compatible = "altr,a10sr-reset", 39 }, 40 }; 41 42 static bool altr_a10sr_reg_readable(struct device *dev, unsigned int reg) 43 { 44 switch (reg) { 45 case ALTR_A10SR_VERSION_READ: 46 case ALTR_A10SR_LED_REG: 47 case ALTR_A10SR_PBDSW_REG: 48 case ALTR_A10SR_PBDSW_IRQ_REG: 49 case ALTR_A10SR_PWR_GOOD1_REG: 50 case ALTR_A10SR_PWR_GOOD2_REG: 51 case ALTR_A10SR_PWR_GOOD3_REG: 52 case ALTR_A10SR_FMCAB_REG: 53 case ALTR_A10SR_HPS_RST_REG: 54 case ALTR_A10SR_USB_QSPI_REG: 55 case ALTR_A10SR_SFPA_REG: 56 case ALTR_A10SR_SFPB_REG: 57 case ALTR_A10SR_I2C_M_REG: 58 case ALTR_A10SR_WARM_RST_REG: 59 case ALTR_A10SR_WR_KEY_REG: 60 case ALTR_A10SR_PMBUS_REG: 61 return true; 62 default: 63 return false; 64 } 65 } 66 67 static bool altr_a10sr_reg_writeable(struct device *dev, unsigned int reg) 68 { 69 switch (reg) { 70 case ALTR_A10SR_LED_REG: 71 case ALTR_A10SR_PBDSW_IRQ_REG: 72 case ALTR_A10SR_FMCAB_REG: 73 case ALTR_A10SR_HPS_RST_REG: 74 case ALTR_A10SR_USB_QSPI_REG: 75 case ALTR_A10SR_SFPA_REG: 76 case ALTR_A10SR_SFPB_REG: 77 case ALTR_A10SR_WARM_RST_REG: 78 case ALTR_A10SR_WR_KEY_REG: 79 case ALTR_A10SR_PMBUS_REG: 80 return true; 81 default: 82 return false; 83 } 84 } 85 86 static bool altr_a10sr_reg_volatile(struct device *dev, unsigned int reg) 87 { 88 switch (reg) { 89 case ALTR_A10SR_PBDSW_REG: 90 case ALTR_A10SR_PBDSW_IRQ_REG: 91 case ALTR_A10SR_PWR_GOOD1_REG: 92 case ALTR_A10SR_PWR_GOOD2_REG: 93 case ALTR_A10SR_PWR_GOOD3_REG: 94 case ALTR_A10SR_HPS_RST_REG: 95 case ALTR_A10SR_I2C_M_REG: 96 case ALTR_A10SR_WARM_RST_REG: 97 case ALTR_A10SR_WR_KEY_REG: 98 case ALTR_A10SR_PMBUS_REG: 99 return true; 100 default: 101 return false; 102 } 103 } 104 105 static const struct regmap_config altr_a10sr_regmap_config = { 106 .reg_bits = 8, 107 .val_bits = 8, 108 109 .cache_type = REGCACHE_NONE, 110 111 .use_single_rw = true, 112 .read_flag_mask = 1, 113 .write_flag_mask = 0, 114 115 .max_register = ALTR_A10SR_WR_KEY_REG, 116 .readable_reg = altr_a10sr_reg_readable, 117 .writeable_reg = altr_a10sr_reg_writeable, 118 .volatile_reg = altr_a10sr_reg_volatile, 119 120 }; 121 122 static int altr_a10sr_spi_probe(struct spi_device *spi) 123 { 124 int ret; 125 struct altr_a10sr *a10sr; 126 127 a10sr = devm_kzalloc(&spi->dev, sizeof(*a10sr), 128 GFP_KERNEL); 129 if (!a10sr) 130 return -ENOMEM; 131 132 spi->mode = SPI_MODE_3; 133 spi->bits_per_word = 8; 134 spi_setup(spi); 135 136 a10sr->dev = &spi->dev; 137 138 spi_set_drvdata(spi, a10sr); 139 140 a10sr->regmap = devm_regmap_init_spi(spi, &altr_a10sr_regmap_config); 141 if (IS_ERR(a10sr->regmap)) { 142 ret = PTR_ERR(a10sr->regmap); 143 dev_err(&spi->dev, "Failed to allocate register map: %d\n", 144 ret); 145 return ret; 146 } 147 148 ret = devm_mfd_add_devices(a10sr->dev, PLATFORM_DEVID_AUTO, 149 altr_a10sr_subdev_info, 150 ARRAY_SIZE(altr_a10sr_subdev_info), 151 NULL, 0, NULL); 152 if (ret) 153 dev_err(a10sr->dev, "Failed to register sub-devices: %d\n", 154 ret); 155 156 return ret; 157 } 158 159 static const struct of_device_id altr_a10sr_spi_of_match[] = { 160 { .compatible = "altr,a10sr" }, 161 { }, 162 }; 163 164 static struct spi_driver altr_a10sr_spi_driver = { 165 .probe = altr_a10sr_spi_probe, 166 .driver = { 167 .name = "altr_a10sr", 168 .of_match_table = of_match_ptr(altr_a10sr_spi_of_match), 169 }, 170 }; 171 builtin_driver(altr_a10sr_spi_driver, spi_register_driver) 172