// SPDX-License-Identifier: (GPL-2.0) /* * Microchip coreQSPI QSPI controller driver * * Copyright (C) 2018-2022 Microchip Technology Inc. and its subsidiaries * * Author: Naga Sureshkumar Relli <[email protected]> * */ #include <linux/clk.h> #include <linux/err.h> #include <linux/init.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/iopoll.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_irq.h> #include <linux/platform_device.h> #include <linux/spi/spi.h> #include <linux/spi/spi-mem.h> /* * QSPI Control register mask defines */ #define CONTROL_ENABLE … #define CONTROL_MASTER … #define CONTROL_XIP … #define CONTROL_XIPADDR … #define CONTROL_CLKIDLE … #define CONTROL_SAMPLE_MASK … #define CONTROL_MODE0 … #define CONTROL_MODE12_MASK … #define CONTROL_MODE12_EX_RO … #define CONTROL_MODE12_EX_RW … #define CONTROL_MODE12_FULL … #define CONTROL_FLAGSX4 … #define CONTROL_CLKRATE_MASK … #define CONTROL_CLKRATE_SHIFT … /* * QSPI Frames register mask defines */ #define FRAMES_TOTALBYTES_MASK … #define FRAMES_CMDBYTES_MASK … #define FRAMES_CMDBYTES_SHIFT … #define FRAMES_SHIFT … #define FRAMES_IDLE_MASK … #define FRAMES_IDLE_SHIFT … #define FRAMES_FLAGBYTE … #define FRAMES_FLAGWORD … /* * QSPI Interrupt Enable register mask defines */ #define IEN_TXDONE … #define IEN_RXDONE … #define IEN_RXAVAILABLE … #define IEN_TXAVAILABLE … #define IEN_RXFIFOEMPTY … #define IEN_TXFIFOFULL … /* * QSPI Status register mask defines */ #define STATUS_TXDONE … #define STATUS_RXDONE … #define STATUS_RXAVAILABLE … #define STATUS_TXAVAILABLE … #define STATUS_RXFIFOEMPTY … #define STATUS_TXFIFOFULL … #define STATUS_READY … #define STATUS_FLAGSX4 … #define STATUS_MASK … #define BYTESUPPER_MASK … #define BYTESLOWER_MASK … #define MAX_DIVIDER … #define MIN_DIVIDER … #define MAX_DATA_CMD_LEN … /* QSPI ready time out value */ #define TIMEOUT_MS … /* * QSPI Register offsets. */ #define REG_CONTROL … #define REG_FRAMES … #define REG_IEN … #define REG_STATUS … #define REG_DIRECT_ACCESS … #define REG_UPPER_ACCESS … #define REG_RX_DATA … #define REG_TX_DATA … #define REG_X4_RX_DATA … #define REG_X4_TX_DATA … #define REG_FRAMESUP … /** * struct mchp_coreqspi - Defines qspi driver instance * @regs: Virtual address of the QSPI controller registers * @clk: QSPI Operating clock * @data_completion: completion structure * @op_lock: lock access to the device * @txbuf: TX buffer * @rxbuf: RX buffer * @irq: IRQ number * @tx_len: Number of bytes left to transfer * @rx_len: Number of bytes left to receive */ struct mchp_coreqspi { … }; static int mchp_coreqspi_set_mode(struct mchp_coreqspi *qspi, const struct spi_mem_op *op) { … } static inline void mchp_coreqspi_read_op(struct mchp_coreqspi *qspi) { … } static inline void mchp_coreqspi_write_op(struct mchp_coreqspi *qspi, bool word) { … } static void mchp_coreqspi_enable_ints(struct mchp_coreqspi *qspi) { … } static void mchp_coreqspi_disable_ints(struct mchp_coreqspi *qspi) { … } static irqreturn_t mchp_coreqspi_isr(int irq, void *dev_id) { … } static int mchp_coreqspi_setup_clock(struct mchp_coreqspi *qspi, struct spi_device *spi) { … } static int mchp_coreqspi_setup_op(struct spi_device *spi_dev) { … } static inline void mchp_coreqspi_config_op(struct mchp_coreqspi *qspi, const struct spi_mem_op *op) { … } static int mchp_qspi_wait_for_ready(struct spi_mem *mem) { … } static int mchp_coreqspi_exec_op(struct spi_mem *mem, const struct spi_mem_op *op) { … } static bool mchp_coreqspi_supports_op(struct spi_mem *mem, const struct spi_mem_op *op) { … } static int mchp_coreqspi_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op) { … } static const struct spi_controller_mem_ops mchp_coreqspi_mem_ops = …; static int mchp_coreqspi_probe(struct platform_device *pdev) { … } static void mchp_coreqspi_remove(struct platform_device *pdev) { … } static const struct of_device_id mchp_coreqspi_of_match[] = …; MODULE_DEVICE_TABLE(of, mchp_coreqspi_of_match); static struct platform_driver mchp_coreqspi_driver = …; module_platform_driver(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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