mirror of
https://github.com/torvalds/linux.git
synced 2024-11-25 13:41:51 +00:00
5c5de36d04
The DMA related fields are set once and never modified. It effectively repeats the content of the same fields in struct pxa2xx_spi_controller. With that, remove DMA parameters from struct chip_data. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/r/20240417110334.2671228-8-andriy.shevchenko@linux.intel.com Signed-off-by: Mark Brown <broonie@kernel.org>
144 lines
3.2 KiB
C
144 lines
3.2 KiB
C
/* 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;
|
|
};
|
|
|
|
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;
|
|
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);
|
|
|
|
#endif /* SPI_PXA2XX_H */
|