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143 lines
3.3 KiB
143 lines
3.3 KiB
/* 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, 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/atomic.h> |
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#include <linux/dmaengine.h> |
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#include <linux/errno.h> |
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#include <linux/io.h> |
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#include <linux/interrupt.h> |
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#include <linux/platform_device.h> |
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#include <linux/pxa2xx_ssp.h> |
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#include <linux/scatterlist.h> |
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#include <linux/sizes.h> |
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#include <linux/spi/spi.h> |
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#include <linux/spi/pxa2xx_spi.h> |
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struct driver_data { |
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/* Driver model hookup */ |
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struct platform_device *pdev; |
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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 register addresses */ |
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void __iomem *ioaddr; |
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phys_addr_t ssdr_physical; |
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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 (*cs_control)(u32 command); |
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void __iomem *lpss_base; |
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/* GPIOs for chip selects */ |
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struct gpio_desc **cs_gpiods; |
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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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struct chip_data { |
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u32 cr1; |
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u32 dds_rate; |
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u32 timeout; |
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u8 n_bytes; |
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u32 dma_burst_size; |
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u32 threshold; |
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u32 dma_threshold; |
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u16 lpss_rx_threshold; |
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u16 lpss_tx_threshold; |
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u8 enable_dma; |
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union { |
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struct gpio_desc *gpiod_cs; |
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unsigned int frm; |
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}; |
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int gpio_cs_inverted; |
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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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void (*cs_control)(u32 command); |
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}; |
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static inline u32 pxa2xx_spi_read(const struct driver_data *drv_data, |
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unsigned reg) |
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{ |
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return __raw_readl(drv_data->ioaddr + reg); |
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} |
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static inline void pxa2xx_spi_write(const struct driver_data *drv_data, |
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unsigned reg, u32 val) |
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{ |
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__raw_writel(val, drv_data->ioaddr + reg); |
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} |
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#define DMA_ALIGNMENT 8 |
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static inline int pxa25x_ssp_comp(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 write_SSSR_CS(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 |= pxa2xx_spi_read(drv_data, SSSR) & 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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extern int pxa2xx_spi_set_dma_burst_and_threshold(struct chip_data *chip, |
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struct spi_device *spi, |
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u8 bits_per_word, |
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u32 *burst_code, |
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u32 *threshold); |
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#endif /* SPI_PXA2XX_H */
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