1// SPDX-License-Identifier: GPL-2.0 2/* 3 * Rockchip RK806 Core (SPI) driver 4 * 5 * Copyright (c) 2021 Rockchip Electronics Co., Ltd. 6 * Copyright (c) 2023 Collabora Ltd. 7 * 8 * Author: Xu Shengfei <xsf@rock-chips.com> 9 * Author: Sebastian Reichel <sebastian.reichel@collabora.com> 10 */ 11 12#include <linux/interrupt.h> 13#include <linux/mfd/core.h> 14#include <linux/mfd/rk808.h> 15#include <linux/module.h> 16#include <linux/regmap.h> 17#include <linux/spi/spi.h> 18 19#define RK806_ADDR_SIZE 2 20#define RK806_CMD_WITH_SIZE(CMD, VALUE_BYTES) \ 21 (RK806_CMD_##CMD | RK806_CMD_CRC_DIS | (VALUE_BYTES - 1)) 22 23static const struct regmap_range rk806_volatile_ranges[] = { 24 regmap_reg_range(RK806_POWER_EN0, RK806_POWER_EN5), 25 regmap_reg_range(RK806_DVS_START_CTRL, RK806_INT_MSK1), 26}; 27 28static const struct regmap_access_table rk806_volatile_table = { 29 .yes_ranges = rk806_volatile_ranges, 30 .n_yes_ranges = ARRAY_SIZE(rk806_volatile_ranges), 31}; 32 33static const struct regmap_config rk806_regmap_config_spi = { 34 .reg_bits = 16, 35 .val_bits = 8, 36 .max_register = RK806_BUCK_RSERVE_REG5, 37 .cache_type = REGCACHE_MAPLE, 38 .volatile_table = &rk806_volatile_table, 39}; 40 41static int rk806_spi_bus_write(void *context, const void *vdata, size_t count) 42{ 43 struct device *dev = context; 44 struct spi_device *spi = to_spi_device(dev); 45 struct spi_transfer xfer[2] = { 0 }; 46 /* data and thus count includes the register address */ 47 size_t val_size = count - RK806_ADDR_SIZE; 48 char cmd; 49 50 if (val_size < 1 || val_size > (RK806_CMD_LEN_MSK + 1)) 51 return -EINVAL; 52 53 cmd = RK806_CMD_WITH_SIZE(WRITE, val_size); 54 55 xfer[0].tx_buf = &cmd; 56 xfer[0].len = sizeof(cmd); 57 xfer[1].tx_buf = vdata; 58 xfer[1].len = count; 59 60 return spi_sync_transfer(spi, xfer, ARRAY_SIZE(xfer)); 61} 62 63static int rk806_spi_bus_read(void *context, const void *vreg, size_t reg_size, 64 void *val, size_t val_size) 65{ 66 struct device *dev = context; 67 struct spi_device *spi = to_spi_device(dev); 68 char txbuf[3] = { 0 }; 69 70 if (reg_size != RK806_ADDR_SIZE || 71 val_size < 1 || val_size > (RK806_CMD_LEN_MSK + 1)) 72 return -EINVAL; 73 74 /* TX buffer contains command byte followed by two address bytes */ 75 txbuf[0] = RK806_CMD_WITH_SIZE(READ, val_size); 76 memcpy(txbuf+1, vreg, reg_size); 77 78 return spi_write_then_read(spi, txbuf, sizeof(txbuf), val, val_size); 79} 80 81static const struct regmap_bus rk806_regmap_bus_spi = { 82 .write = rk806_spi_bus_write, 83 .read = rk806_spi_bus_read, 84 .reg_format_endian_default = REGMAP_ENDIAN_LITTLE, 85}; 86 87static int rk8xx_spi_probe(struct spi_device *spi) 88{ 89 struct regmap *regmap; 90 91 regmap = devm_regmap_init(&spi->dev, &rk806_regmap_bus_spi, 92 &spi->dev, &rk806_regmap_config_spi); 93 if (IS_ERR(regmap)) 94 return dev_err_probe(&spi->dev, PTR_ERR(regmap), 95 "Failed to init regmap\n"); 96 97 return rk8xx_probe(&spi->dev, RK806_ID, spi->irq, regmap); 98} 99 100static const struct of_device_id rk8xx_spi_of_match[] = { 101 { .compatible = "rockchip,rk806", }, 102 { } 103}; 104MODULE_DEVICE_TABLE(of, rk8xx_spi_of_match); 105 106static const struct spi_device_id rk8xx_spi_id_table[] = { 107 { "rk806", 0 }, 108 { } 109}; 110MODULE_DEVICE_TABLE(spi, rk8xx_spi_id_table); 111 112static struct spi_driver rk8xx_spi_driver = { 113 .driver = { 114 .name = "rk8xx-spi", 115 .of_match_table = rk8xx_spi_of_match, 116 }, 117 .probe = rk8xx_spi_probe, 118 .id_table = rk8xx_spi_id_table, 119}; 120module_spi_driver(rk8xx_spi_driver); 121 122MODULE_AUTHOR("Xu Shengfei <xsf@rock-chips.com>"); 123MODULE_DESCRIPTION("RK8xx SPI PMIC driver"); 124MODULE_LICENSE("GPL"); 125