// SPDX-License-Identifier: GPL-2.0-only /* * IMG SPFI controller driver * * Copyright (C) 2007,2008,2013 Imagination Technologies Ltd. * Copyright (C) 2014 Google, Inc. */ #include <linux/clk.h> #include <linux/delay.h> #include <linux/dmaengine.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/irq.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/scatterlist.h> #include <linux/slab.h> #include <linux/spi/spi.h> #include <linux/spinlock.h> #define SPFI_DEVICE_PARAMETER(x) … #define SPFI_DEVICE_PARAMETER_BITCLK_SHIFT … #define SPFI_DEVICE_PARAMETER_BITCLK_MASK … #define SPFI_DEVICE_PARAMETER_CSSETUP_SHIFT … #define SPFI_DEVICE_PARAMETER_CSSETUP_MASK … #define SPFI_DEVICE_PARAMETER_CSHOLD_SHIFT … #define SPFI_DEVICE_PARAMETER_CSHOLD_MASK … #define SPFI_DEVICE_PARAMETER_CSDELAY_SHIFT … #define SPFI_DEVICE_PARAMETER_CSDELAY_MASK … #define SPFI_CONTROL … #define SPFI_CONTROL_CONTINUE … #define SPFI_CONTROL_SOFT_RESET … #define SPFI_CONTROL_SEND_DMA … #define SPFI_CONTROL_GET_DMA … #define SPFI_CONTROL_SE … #define SPFI_CONTROL_TMODE_SHIFT … #define SPFI_CONTROL_TMODE_MASK … #define SPFI_CONTROL_TMODE_SINGLE … #define SPFI_CONTROL_TMODE_DUAL … #define SPFI_CONTROL_TMODE_QUAD … #define SPFI_CONTROL_SPFI_EN … #define SPFI_TRANSACTION … #define SPFI_TRANSACTION_TSIZE_SHIFT … #define SPFI_TRANSACTION_TSIZE_MASK … #define SPFI_PORT_STATE … #define SPFI_PORT_STATE_DEV_SEL_SHIFT … #define SPFI_PORT_STATE_DEV_SEL_MASK … #define SPFI_PORT_STATE_CK_POL(x) … #define SPFI_PORT_STATE_CK_PHASE(x) … #define SPFI_TX_32BIT_VALID_DATA … #define SPFI_TX_8BIT_VALID_DATA … #define SPFI_RX_32BIT_VALID_DATA … #define SPFI_RX_8BIT_VALID_DATA … #define SPFI_INTERRUPT_STATUS … #define SPFI_INTERRUPT_ENABLE … #define SPFI_INTERRUPT_CLEAR … #define SPFI_INTERRUPT_IACCESS … #define SPFI_INTERRUPT_GDEX8BIT … #define SPFI_INTERRUPT_ALLDONETRIG … #define SPFI_INTERRUPT_GDFUL … #define SPFI_INTERRUPT_GDHF … #define SPFI_INTERRUPT_GDEX32BIT … #define SPFI_INTERRUPT_GDTRIG … #define SPFI_INTERRUPT_SDFUL … #define SPFI_INTERRUPT_SDHF … #define SPFI_INTERRUPT_SDE … #define SPFI_INTERRUPT_SDTRIG … /* * There are four parallel FIFOs of 16 bytes each. The word buffer * (*_32BIT_VALID_DATA) accesses all four FIFOs at once, resulting in an * effective FIFO size of 64 bytes. The byte buffer (*_8BIT_VALID_DATA) * accesses only a single FIFO, resulting in an effective FIFO size of * 16 bytes. */ #define SPFI_32BIT_FIFO_SIZE … #define SPFI_8BIT_FIFO_SIZE … struct img_spfi { … }; static inline u32 spfi_readl(struct img_spfi *spfi, u32 reg) { … } static inline void spfi_writel(struct img_spfi *spfi, u32 val, u32 reg) { … } static inline void spfi_start(struct img_spfi *spfi) { … } static inline void spfi_reset(struct img_spfi *spfi) { … } static int spfi_wait_all_done(struct img_spfi *spfi) { … } static unsigned int spfi_pio_write32(struct img_spfi *spfi, const u32 *buf, unsigned int max) { … } static unsigned int spfi_pio_write8(struct img_spfi *spfi, const u8 *buf, unsigned int max) { … } static unsigned int spfi_pio_read32(struct img_spfi *spfi, u32 *buf, unsigned int max) { … } static unsigned int spfi_pio_read8(struct img_spfi *spfi, u8 *buf, unsigned int max) { … } static int img_spfi_start_pio(struct spi_controller *host, struct spi_device *spi, struct spi_transfer *xfer) { … } static void img_spfi_dma_rx_cb(void *data) { … } static void img_spfi_dma_tx_cb(void *data) { … } static int img_spfi_start_dma(struct spi_controller *host, struct spi_device *spi, struct spi_transfer *xfer) { … } static void img_spfi_handle_err(struct spi_controller *host, struct spi_message *msg) { … } static int img_spfi_prepare(struct spi_controller *host, struct spi_message *msg) { … } static int img_spfi_unprepare(struct spi_controller *host, struct spi_message *msg) { … } static void img_spfi_config(struct spi_controller *host, struct spi_device *spi, struct spi_transfer *xfer) { … } static int img_spfi_transfer_one(struct spi_controller *host, struct spi_device *spi, struct spi_transfer *xfer) { … } static bool img_spfi_can_dma(struct spi_controller *host, struct spi_device *spi, struct spi_transfer *xfer) { … } static irqreturn_t img_spfi_irq(int irq, void *dev_id) { … } static int img_spfi_probe(struct platform_device *pdev) { … } static void img_spfi_remove(struct platform_device *pdev) { … } #ifdef CONFIG_PM static int img_spfi_runtime_suspend(struct device *dev) { … } static int img_spfi_runtime_resume(struct device *dev) { … } #endif /* CONFIG_PM */ #ifdef CONFIG_PM_SLEEP static int img_spfi_suspend(struct device *dev) { … } static int img_spfi_resume(struct device *dev) { … } #endif /* CONFIG_PM_SLEEP */ static const struct dev_pm_ops img_spfi_pm_ops = …; static const struct of_device_id img_spfi_of_match[] = …; MODULE_DEVICE_TABLE(of, img_spfi_of_match); static struct platform_driver img_spfi_driver = …; module_platform_driver(…) …; MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
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