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/* 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/dmaengine.h>
#include <linux/irqreturn.h>
#include <linux/types.h>
#include <linux/sizes.h>
#include <linux/pxa2xx_ssp.h>
struct gpio_desc;
/*
* The platform data for SSP controller devices
* (resides in device.platform_data).
*/
struct pxa2xx_spi_controller {
u8 num_chipselect;
u8 enable_dma;
u8 dma_burst_size;
bool is_target;
/* DMA engine specific config */
dma_filter_fn dma_filter;
void *tx_param;
void *rx_param;
/* For non-PXA arches */
struct ssp_device ssp;
};
/*
* The controller specific data for SPI target devices
* (resides in spi_board_info.controller_data),
* copied to spi_device.platform_data ... mostly for
* DMA tuning.
*/
struct pxa2xx_spi_chip {
u8 tx_threshold;
u8 tx_hi_threshold;
u8 rx_threshold;
u8 dma_burst_size;
u32 timeout;
};
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 */
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