diff options
| author | Yinbo Zhu <zhuyinbo@loongson.cn> | 2023-06-13 15:58:34 +0800 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2023-07-31 15:57:09 +0100 |
| commit | 6c7a864007b66e60a3f64858a9555efed408b048 (patch) | |
| tree | df60917824018149f3879d1266548faf15834feb /drivers/spi/spi-loongson.h | |
| parent | b350e6c6297aaa2533da23a21398751eeeecc101 (diff) | |
spi: loongson: add bus driver for the loongson spi controller
This bus driver supports the Loongson SPI hardware controller in the
Loongson platforms and supports the use DTS and PCI framework to
register SPI device resources.
Signed-off-by: Yinbo Zhu <zhuyinbo@loongson.cn>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Mark Brown <broonie@kernel.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20230613075834.5219-3-zhuyinbo@loongson.cn
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-loongson.h')
| -rw-r--r-- | drivers/spi/spi-loongson.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/drivers/spi/spi-loongson.h b/drivers/spi/spi-loongson.h new file mode 100644 index 000000000000..35f95b161842 --- /dev/null +++ b/drivers/spi/spi-loongson.h @@ -0,0 +1,49 @@ +/* SPDX-License-Identifier: GPL-2.0+ */ +/* Header File for Loongson SPI Driver. */ +/* Copyright (C) 2023 Loongson Technology Corporation Limited */ + +#ifndef __LINUX_SPI_LOONGSON_H +#define __LINUX_SPI_LOONGSON_H + +#include <linux/bits.h> +#include <linux/pm.h> +#include <linux/types.h> + +#define LOONGSON_SPI_SPCR_REG 0x00 +#define LOONGSON_SPI_SPSR_REG 0x01 +#define LOONGSON_SPI_FIFO_REG 0x02 +#define LOONGSON_SPI_SPER_REG 0x03 +#define LOONGSON_SPI_PARA_REG 0x04 +#define LOONGSON_SPI_SFCS_REG 0x05 +#define LOONGSON_SPI_TIMI_REG 0x06 + +/* Bits definition for Loongson SPI register */ +#define LOONGSON_SPI_PARA_MEM_EN BIT(0) +#define LOONGSON_SPI_SPCR_CPHA BIT(2) +#define LOONGSON_SPI_SPCR_CPOL BIT(3) +#define LOONGSON_SPI_SPCR_SPE BIT(6) +#define LOONGSON_SPI_SPSR_RFEMPTY BIT(0) +#define LOONGSON_SPI_SPSR_WCOL BIT(6) +#define LOONGSON_SPI_SPSR_SPIF BIT(7) + +struct device; +struct spi_controller; + +struct loongson_spi { + struct spi_controller *controller; + void __iomem *base; + int cs_active; + unsigned int hz; + unsigned char spcr; + unsigned char sper; + unsigned char spsr; + unsigned char para; + unsigned char sfcs; + unsigned char timi; + unsigned int mode; + u64 clk_rate; +}; + +int loongson_spi_init_controller(struct device *dev, void __iomem *reg); +extern const struct dev_pm_ops loongson_spi_dev_pm_ops; +#endif /* __LINUX_SPI_LOONGSON_H */ |