125 lines
3.4 KiB
C
125 lines
3.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Rockchip RK806 Core (SPI) driver
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*
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* Copyright (c) 2021 Rockchip Electronics Co., Ltd.
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* Copyright (c) 2023 Collabora Ltd.
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*
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* Author: Xu Shengfei <xsf@rock-chips.com>
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* Author: Sebastian Reichel <sebastian.reichel@collabora.com>
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*/
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#include <linux/interrupt.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/rk808.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/spi/spi.h>
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#define RK806_ADDR_SIZE 2
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#define RK806_CMD_WITH_SIZE(CMD, VALUE_BYTES) \
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(RK806_CMD_##CMD | RK806_CMD_CRC_DIS | (VALUE_BYTES - 1))
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static const struct regmap_range rk806_volatile_ranges[] = {
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regmap_reg_range(RK806_POWER_EN0, RK806_POWER_EN5),
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regmap_reg_range(RK806_DVS_START_CTRL, RK806_INT_MSK1),
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};
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static const struct regmap_access_table rk806_volatile_table = {
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.yes_ranges = rk806_volatile_ranges,
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.n_yes_ranges = ARRAY_SIZE(rk806_volatile_ranges),
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};
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static const struct regmap_config rk806_regmap_config_spi = {
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.reg_bits = 16,
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.val_bits = 8,
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.max_register = RK806_BUCK_RSERVE_REG5,
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.cache_type = REGCACHE_RBTREE,
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.volatile_table = &rk806_volatile_table,
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};
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static int rk806_spi_bus_write(void *context, const void *vdata, size_t count)
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{
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struct device *dev = context;
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struct spi_device *spi = to_spi_device(dev);
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struct spi_transfer xfer[2] = { 0 };
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/* data and thus count includes the register address */
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size_t val_size = count - RK806_ADDR_SIZE;
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char cmd;
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if (val_size < 1 || val_size > (RK806_CMD_LEN_MSK + 1))
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return -EINVAL;
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cmd = RK806_CMD_WITH_SIZE(WRITE, val_size);
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xfer[0].tx_buf = &cmd;
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xfer[0].len = sizeof(cmd);
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xfer[1].tx_buf = vdata;
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xfer[1].len = count;
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return spi_sync_transfer(spi, xfer, ARRAY_SIZE(xfer));
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}
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static int rk806_spi_bus_read(void *context, const void *vreg, size_t reg_size,
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void *val, size_t val_size)
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{
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struct device *dev = context;
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struct spi_device *spi = to_spi_device(dev);
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char txbuf[3] = { 0 };
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if (reg_size != RK806_ADDR_SIZE ||
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val_size < 1 || val_size > (RK806_CMD_LEN_MSK + 1))
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return -EINVAL;
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/* TX buffer contains command byte followed by two address bytes */
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txbuf[0] = RK806_CMD_WITH_SIZE(READ, val_size);
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memcpy(txbuf+1, vreg, reg_size);
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return spi_write_then_read(spi, txbuf, sizeof(txbuf), val, val_size);
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}
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static const struct regmap_bus rk806_regmap_bus_spi = {
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.write = rk806_spi_bus_write,
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.read = rk806_spi_bus_read,
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.reg_format_endian_default = REGMAP_ENDIAN_LITTLE,
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};
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static int rk8xx_spi_probe(struct spi_device *spi)
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{
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struct regmap *regmap;
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regmap = devm_regmap_init(&spi->dev, &rk806_regmap_bus_spi,
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&spi->dev, &rk806_regmap_config_spi);
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if (IS_ERR(regmap))
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return dev_err_probe(&spi->dev, PTR_ERR(regmap),
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"Failed to init regmap\n");
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return rk8xx_probe(&spi->dev, RK806_ID, spi->irq, regmap);
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}
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static const struct of_device_id rk8xx_spi_of_match[] = {
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{ .compatible = "rockchip,rk806", },
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{ }
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};
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MODULE_DEVICE_TABLE(of, rk8xx_spi_of_match);
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static const struct spi_device_id rk8xx_spi_id_table[] = {
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{ "rk806", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(spi, rk8xx_spi_id_table);
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static struct spi_driver rk8xx_spi_driver = {
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.driver = {
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.name = "rk8xx-spi",
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.of_match_table = rk8xx_spi_of_match,
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},
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.probe = rk8xx_spi_probe,
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.id_table = rk8xx_spi_id_table,
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};
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module_spi_driver(rk8xx_spi_driver);
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MODULE_AUTHOR("Xu Shengfei <xsf@rock-chips.com>");
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MODULE_DESCRIPTION("RK8xx SPI PMIC driver");
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MODULE_LICENSE("GPL");
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