1 /* 2 * Copyright Intel Corporation (C) 2014-2016. All Rights Reserved 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms and conditions of the GNU General Public License, 6 * version 2, as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 * 13 * You should have received a copy of the GNU General Public License along with 14 * this program. If not, see <http://www.gnu.org/licenses/>. 15 * 16 * SPI access for Altera Arria10 MAX5 System Resource Chip 17 * 18 * Adapted from DA9052 19 */ 20 21 #include <linux/mfd/altera-a10sr.h> 22 #include <linux/mfd/core.h> 23 #include <linux/module.h> 24 #include <linux/of.h> 25 #include <linux/spi/spi.h> 26 27 static const struct mfd_cell altr_a10sr_subdev_info[] = { 28 { 29 .name = "altr_a10sr_gpio", 30 .of_compatible = "altr,a10sr-gpio", 31 }, 32 }; 33 34 static bool altr_a10sr_reg_readable(struct device *dev, unsigned int reg) 35 { 36 switch (reg) { 37 case ALTR_A10SR_VERSION_READ: 38 case ALTR_A10SR_LED_REG: 39 case ALTR_A10SR_PBDSW_REG: 40 case ALTR_A10SR_PBDSW_IRQ_REG: 41 case ALTR_A10SR_PWR_GOOD1_REG: 42 case ALTR_A10SR_PWR_GOOD2_REG: 43 case ALTR_A10SR_PWR_GOOD3_REG: 44 case ALTR_A10SR_FMCAB_REG: 45 case ALTR_A10SR_HPS_RST_REG: 46 case ALTR_A10SR_USB_QSPI_REG: 47 case ALTR_A10SR_SFPA_REG: 48 case ALTR_A10SR_SFPB_REG: 49 case ALTR_A10SR_I2C_M_REG: 50 case ALTR_A10SR_WARM_RST_REG: 51 case ALTR_A10SR_WR_KEY_REG: 52 case ALTR_A10SR_PMBUS_REG: 53 return true; 54 default: 55 return false; 56 } 57 } 58 59 static bool altr_a10sr_reg_writeable(struct device *dev, unsigned int reg) 60 { 61 switch (reg) { 62 case ALTR_A10SR_LED_REG: 63 case ALTR_A10SR_PBDSW_IRQ_REG: 64 case ALTR_A10SR_FMCAB_REG: 65 case ALTR_A10SR_HPS_RST_REG: 66 case ALTR_A10SR_USB_QSPI_REG: 67 case ALTR_A10SR_SFPA_REG: 68 case ALTR_A10SR_SFPB_REG: 69 case ALTR_A10SR_WARM_RST_REG: 70 case ALTR_A10SR_WR_KEY_REG: 71 case ALTR_A10SR_PMBUS_REG: 72 return true; 73 default: 74 return false; 75 } 76 } 77 78 static bool altr_a10sr_reg_volatile(struct device *dev, unsigned int reg) 79 { 80 switch (reg) { 81 case ALTR_A10SR_PBDSW_REG: 82 case ALTR_A10SR_PBDSW_IRQ_REG: 83 case ALTR_A10SR_PWR_GOOD1_REG: 84 case ALTR_A10SR_PWR_GOOD2_REG: 85 case ALTR_A10SR_PWR_GOOD3_REG: 86 case ALTR_A10SR_HPS_RST_REG: 87 case ALTR_A10SR_I2C_M_REG: 88 case ALTR_A10SR_WARM_RST_REG: 89 case ALTR_A10SR_WR_KEY_REG: 90 case ALTR_A10SR_PMBUS_REG: 91 return true; 92 default: 93 return false; 94 } 95 } 96 97 static const struct regmap_config altr_a10sr_regmap_config = { 98 .reg_bits = 8, 99 .val_bits = 8, 100 101 .cache_type = REGCACHE_NONE, 102 103 .use_single_rw = true, 104 .read_flag_mask = 1, 105 .write_flag_mask = 0, 106 107 .max_register = ALTR_A10SR_WR_KEY_REG, 108 .readable_reg = altr_a10sr_reg_readable, 109 .writeable_reg = altr_a10sr_reg_writeable, 110 .volatile_reg = altr_a10sr_reg_volatile, 111 112 }; 113 114 static int altr_a10sr_spi_probe(struct spi_device *spi) 115 { 116 int ret; 117 struct altr_a10sr *a10sr; 118 119 a10sr = devm_kzalloc(&spi->dev, sizeof(*a10sr), 120 GFP_KERNEL); 121 if (!a10sr) 122 return -ENOMEM; 123 124 spi->mode = SPI_MODE_3; 125 spi->bits_per_word = 8; 126 spi_setup(spi); 127 128 a10sr->dev = &spi->dev; 129 130 spi_set_drvdata(spi, a10sr); 131 132 a10sr->regmap = devm_regmap_init_spi(spi, &altr_a10sr_regmap_config); 133 if (IS_ERR(a10sr->regmap)) { 134 ret = PTR_ERR(a10sr->regmap); 135 dev_err(&spi->dev, "Failed to allocate register map: %d\n", 136 ret); 137 return ret; 138 } 139 140 ret = devm_mfd_add_devices(a10sr->dev, PLATFORM_DEVID_AUTO, 141 altr_a10sr_subdev_info, 142 ARRAY_SIZE(altr_a10sr_subdev_info), 143 NULL, 0, NULL); 144 if (ret) 145 dev_err(a10sr->dev, "Failed to register sub-devices: %d\n", 146 ret); 147 148 return ret; 149 } 150 151 static const struct of_device_id altr_a10sr_spi_of_match[] = { 152 { .compatible = "altr,a10sr" }, 153 { }, 154 }; 155 MODULE_DEVICE_TABLE(of, altr_a10sr_spi_of_match); 156 157 static struct spi_driver altr_a10sr_spi_driver = { 158 .probe = altr_a10sr_spi_probe, 159 .driver = { 160 .name = "altr_a10sr", 161 .of_match_table = of_match_ptr(altr_a10sr_spi_of_match), 162 }, 163 }; 164 165 module_spi_driver(altr_a10sr_spi_driver); 166 167 MODULE_LICENSE("GPL v2"); 168 MODULE_AUTHOR("Thor Thayer <tthayer@opensource.altera.com>"); 169 MODULE_DESCRIPTION("Altera Arria10 DevKit System Resource MFD Driver"); 170