// SPDX-License-Identifier: GPL-2.0+ // // Driver for Amlogic Meson SPI flash controller (SPIFC) // // Copyright (C) 2014 Beniamino Galvani <[email protected]> // #include <linux/clk.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/regmap.h> #include <linux/spi/spi.h> #include <linux/types.h> /* register map */ #define REG_CMD … #define REG_ADDR … #define REG_CTRL … #define REG_CTRL1 … #define REG_STATUS … #define REG_CTRL2 … #define REG_CLOCK … #define REG_USER … #define REG_USER1 … #define REG_USER2 … #define REG_USER3 … #define REG_USER4 … #define REG_SLAVE … #define REG_SLAVE1 … #define REG_SLAVE2 … #define REG_SLAVE3 … #define REG_C0 … #define REG_B8 … #define REG_MAX … /* register fields */ #define CMD_USER … #define CTRL_ENABLE_AHB … #define CLOCK_SOURCE … #define CLOCK_DIV_SHIFT … #define CLOCK_DIV_MASK … #define CLOCK_CNT_HIGH_SHIFT … #define CLOCK_CNT_HIGH_MASK … #define CLOCK_CNT_LOW_SHIFT … #define CLOCK_CNT_LOW_MASK … #define USER_DIN_EN_MS … #define USER_CMP_MODE … #define USER_UC_DOUT_SEL … #define USER_UC_DIN_SEL … #define USER_UC_MASK … #define USER1_BN_UC_DOUT_SHIFT … #define USER1_BN_UC_DOUT_MASK … #define USER1_BN_UC_DIN_SHIFT … #define USER1_BN_UC_DIN_MASK … #define USER4_CS_ACT … #define SLAVE_TRST_DONE … #define SLAVE_OP_MODE … #define SLAVE_SW_RST … #define SPIFC_BUFFER_SIZE … /** * struct meson_spifc * @host: the SPI host * @regmap: regmap for device registers * @clk: input clock of the built-in baud rate generator * @dev: the device structure */ struct meson_spifc { … }; static const struct regmap_config spifc_regmap_config = …; /** * meson_spifc_wait_ready() - wait for the current operation to terminate * @spifc: the Meson SPI device * Return: 0 on success, a negative value on error */ static int meson_spifc_wait_ready(struct meson_spifc *spifc) { … } /** * meson_spifc_drain_buffer() - copy data from device buffer to memory * @spifc: the Meson SPI device * @buf: the destination buffer * @len: number of bytes to copy */ static void meson_spifc_drain_buffer(struct meson_spifc *spifc, u8 *buf, int len) { … } /** * meson_spifc_fill_buffer() - copy data from memory to device buffer * @spifc: the Meson SPI device * @buf: the source buffer * @len: number of bytes to copy */ static void meson_spifc_fill_buffer(struct meson_spifc *spifc, const u8 *buf, int len) { … } /** * meson_spifc_setup_speed() - program the clock divider * @spifc: the Meson SPI device * @speed: desired speed in Hz */ static void meson_spifc_setup_speed(struct meson_spifc *spifc, u32 speed) { … } /** * meson_spifc_txrx() - transfer a chunk of data * @spifc: the Meson SPI device * @xfer: the current SPI transfer * @offset: offset of the data to transfer * @len: length of the data to transfer * @last_xfer: whether this is the last transfer of the message * @last_chunk: whether this is the last chunk of the transfer * Return: 0 on success, a negative value on error */ static int meson_spifc_txrx(struct meson_spifc *spifc, struct spi_transfer *xfer, int offset, int len, bool last_xfer, bool last_chunk) { … } /** * meson_spifc_transfer_one() - perform a single transfer * @host: the SPI host * @spi: the SPI device * @xfer: the current SPI transfer * Return: 0 on success, a negative value on error */ static int meson_spifc_transfer_one(struct spi_controller *host, struct spi_device *spi, struct spi_transfer *xfer) { … } /** * meson_spifc_hw_init() - reset and initialize the SPI controller * @spifc: the Meson SPI device */ static void meson_spifc_hw_init(struct meson_spifc *spifc) { … } static int meson_spifc_probe(struct platform_device *pdev) { … } static void meson_spifc_remove(struct platform_device *pdev) { … } #ifdef CONFIG_PM_SLEEP static int meson_spifc_suspend(struct device *dev) { … } static int meson_spifc_resume(struct device *dev) { … } #endif /* CONFIG_PM_SLEEP */ #ifdef CONFIG_PM static int meson_spifc_runtime_suspend(struct device *dev) { … } static int meson_spifc_runtime_resume(struct device *dev) { … } #endif /* CONFIG_PM */ static const struct dev_pm_ops meson_spifc_pm_ops = …; static const struct of_device_id meson_spifc_dt_match[] = …; MODULE_DEVICE_TABLE(of, meson_spifc_dt_match); static struct platform_driver meson_spifc_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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