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The platform_data field may be supplied by legacy board code. In other cases we override it, and module remove and probe cycle will crash the kernel since it will carry a stale pointer. Fix this by supplying a third argument to the pxa2xx_spi_probe() and avoid overriding dev->platform_data. Reported-by: Hao Ma <hao.ma@intel.com> Fixes:cc160697a5("spi: pxa2xx: Convert PCI driver to use spi-pxa2xx code directly") Fixes:3d8f037fbc("spi: pxa2xx: Move platform driver to a separate file") Fixes:20ade9b977("spi: pxa2xx: Extract pxa2xx_spi_platform_*() callbacks") Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Link: https://patch.msgid.link/20240822113408.750831-2-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
142 lines
3.3 KiB
C
142 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2005 Stephen Street / StreetFire Sound Labs
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* Copyright (C) 2013, 2021 Intel Corporation
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*/
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#ifndef SPI_PXA2XX_H
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#define SPI_PXA2XX_H
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#include <linux/dmaengine.h>
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#include <linux/irqreturn.h>
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#include <linux/types.h>
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#include <linux/sizes.h>
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#include <linux/pxa2xx_ssp.h>
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struct device;
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struct gpio_desc;
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/*
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* The platform data for SSP controller devices
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* (resides in device.platform_data).
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*/
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struct pxa2xx_spi_controller {
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u8 num_chipselect;
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u8 enable_dma;
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u8 dma_burst_size;
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bool is_target;
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/* DMA engine specific config */
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dma_filter_fn dma_filter;
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void *tx_param;
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void *rx_param;
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/* For non-PXA arches */
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struct ssp_device ssp;
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};
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struct spi_controller;
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struct spi_device;
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struct spi_transfer;
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struct driver_data {
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/* SSP Info */
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struct ssp_device *ssp;
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/* SPI framework hookup */
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enum pxa_ssp_type ssp_type;
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struct spi_controller *controller;
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/* PXA hookup */
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struct pxa2xx_spi_controller *controller_info;
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/* SSP masks*/
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u32 dma_cr1;
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u32 int_cr1;
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u32 clear_sr;
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u32 mask_sr;
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/* DMA engine support */
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atomic_t dma_running;
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/* Current transfer state info */
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void *tx;
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void *tx_end;
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void *rx;
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void *rx_end;
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u8 n_bytes;
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int (*write)(struct driver_data *drv_data);
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int (*read)(struct driver_data *drv_data);
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irqreturn_t (*transfer_handler)(struct driver_data *drv_data);
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void __iomem *lpss_base;
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/* Optional slave FIFO ready signal */
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struct gpio_desc *gpiod_ready;
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};
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static inline u32 pxa2xx_spi_read(const struct driver_data *drv_data, u32 reg)
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{
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return pxa_ssp_read_reg(drv_data->ssp, reg);
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}
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static inline void pxa2xx_spi_write(const struct driver_data *drv_data, u32 reg, u32 val)
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{
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pxa_ssp_write_reg(drv_data->ssp, reg, val);
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}
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#define DMA_ALIGNMENT 8
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static inline int pxa25x_ssp_comp(const struct driver_data *drv_data)
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{
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switch (drv_data->ssp_type) {
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case PXA25x_SSP:
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case CE4100_SSP:
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case QUARK_X1000_SSP:
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return 1;
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default:
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return 0;
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}
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}
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static inline void clear_SSCR1_bits(const struct driver_data *drv_data, u32 bits)
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{
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pxa2xx_spi_write(drv_data, SSCR1, pxa2xx_spi_read(drv_data, SSCR1) & ~bits);
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}
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static inline u32 read_SSSR_bits(const struct driver_data *drv_data, u32 bits)
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{
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return pxa2xx_spi_read(drv_data, SSSR) & bits;
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}
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static inline void write_SSSR_CS(const struct driver_data *drv_data, u32 val)
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{
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if (drv_data->ssp_type == CE4100_SSP ||
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drv_data->ssp_type == QUARK_X1000_SSP)
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val |= read_SSSR_bits(drv_data, SSSR_ALT_FRM_MASK);
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pxa2xx_spi_write(drv_data, SSSR, val);
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}
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extern int pxa2xx_spi_flush(struct driver_data *drv_data);
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#define MAX_DMA_LEN SZ_64K
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#define DEFAULT_DMA_CR1 (SSCR1_TSRE | SSCR1_RSRE | SSCR1_TRAIL)
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extern irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data);
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extern int pxa2xx_spi_dma_prepare(struct driver_data *drv_data,
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struct spi_transfer *xfer);
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extern void pxa2xx_spi_dma_start(struct driver_data *drv_data);
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extern void pxa2xx_spi_dma_stop(struct driver_data *drv_data);
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extern int pxa2xx_spi_dma_setup(struct driver_data *drv_data);
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extern void pxa2xx_spi_dma_release(struct driver_data *drv_data);
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int pxa2xx_spi_probe(struct device *dev, struct ssp_device *ssp,
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struct pxa2xx_spi_controller *platform_info);
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void pxa2xx_spi_remove(struct device *dev);
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extern const struct dev_pm_ops pxa2xx_spi_pm_ops;
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#endif /* SPI_PXA2XX_H */
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