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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /drivers/spi/spi-pxa2xx.h | |
parent | Initial commit. (diff) | |
download | linux-upstream.tar.xz linux-upstream.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | drivers/spi/spi-pxa2xx.h | 132 |
1 files changed, 132 insertions, 0 deletions
diff --git a/drivers/spi/spi-pxa2xx.h b/drivers/spi/spi-pxa2xx.h new file mode 100644 index 000000000..45cdbbc71 --- /dev/null +++ b/drivers/spi/spi-pxa2xx.h @@ -0,0 +1,132 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs + * Copyright (C) 2013, 2021 Intel Corporation + */ + +#ifndef SPI_PXA2XX_H +#define SPI_PXA2XX_H + +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/types.h> +#include <linux/sizes.h> + +#include <linux/pxa2xx_ssp.h> + +struct gpio_desc; +struct pxa2xx_spi_controller; +struct spi_controller; +struct spi_device; +struct spi_transfer; + +struct driver_data { + /* SSP Info */ + struct ssp_device *ssp; + + /* SPI framework hookup */ + enum pxa_ssp_type ssp_type; + struct spi_controller *controller; + + /* PXA hookup */ + struct pxa2xx_spi_controller *controller_info; + + /* SSP masks*/ + u32 dma_cr1; + u32 int_cr1; + u32 clear_sr; + u32 mask_sr; + + /* DMA engine support */ + atomic_t dma_running; + + /* Current transfer state info */ + void *tx; + void *tx_end; + void *rx; + void *rx_end; + u8 n_bytes; + int (*write)(struct driver_data *drv_data); + int (*read)(struct driver_data *drv_data); + irqreturn_t (*transfer_handler)(struct driver_data *drv_data); + + void __iomem *lpss_base; + + /* Optional slave FIFO ready signal */ + struct gpio_desc *gpiod_ready; +}; + +struct chip_data { + u32 cr1; + u32 dds_rate; + u32 timeout; + u8 enable_dma; + u32 dma_burst_size; + u32 dma_threshold; + u32 threshold; + u16 lpss_rx_threshold; + u16 lpss_tx_threshold; +}; + +static inline u32 pxa2xx_spi_read(const struct driver_data *drv_data, u32 reg) +{ + return pxa_ssp_read_reg(drv_data->ssp, reg); +} + +static inline void pxa2xx_spi_write(const struct driver_data *drv_data, u32 reg, u32 val) +{ + pxa_ssp_write_reg(drv_data->ssp, reg, val); +} + +#define DMA_ALIGNMENT 8 + +static inline int pxa25x_ssp_comp(const struct driver_data *drv_data) +{ + switch (drv_data->ssp_type) { + case PXA25x_SSP: + case CE4100_SSP: + case QUARK_X1000_SSP: + return 1; + default: + return 0; + } +} + +static inline void clear_SSCR1_bits(const struct driver_data *drv_data, u32 bits) +{ + pxa2xx_spi_write(drv_data, SSCR1, pxa2xx_spi_read(drv_data, SSCR1) & ~bits); +} + +static inline u32 read_SSSR_bits(const struct driver_data *drv_data, u32 bits) +{ + return pxa2xx_spi_read(drv_data, SSSR) & bits; +} + +static inline void write_SSSR_CS(const struct driver_data *drv_data, u32 val) +{ + if (drv_data->ssp_type == CE4100_SSP || + drv_data->ssp_type == QUARK_X1000_SSP) + val |= read_SSSR_bits(drv_data, SSSR_ALT_FRM_MASK); + + pxa2xx_spi_write(drv_data, SSSR, val); +} + +extern int pxa2xx_spi_flush(struct driver_data *drv_data); + +#define MAX_DMA_LEN SZ_64K +#define DEFAULT_DMA_CR1 (SSCR1_TSRE | SSCR1_RSRE | SSCR1_TRAIL) + +extern irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data); +extern int pxa2xx_spi_dma_prepare(struct driver_data *drv_data, + struct spi_transfer *xfer); +extern void pxa2xx_spi_dma_start(struct driver_data *drv_data); +extern void pxa2xx_spi_dma_stop(struct driver_data *drv_data); +extern int pxa2xx_spi_dma_setup(struct driver_data *drv_data); +extern void pxa2xx_spi_dma_release(struct driver_data *drv_data); +extern int pxa2xx_spi_set_dma_burst_and_threshold(struct chip_data *chip, + struct spi_device *spi, + u8 bits_per_word, + u32 *burst_code, + u32 *threshold); + +#endif /* SPI_PXA2XX_H */ |