diff options
Diffstat (limited to 'src/soc/sifive/fu540/include')
| -rw-r--r-- | src/soc/sifive/fu540/include/soc/spi.h | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/src/soc/sifive/fu540/include/soc/spi.h b/src/soc/sifive/fu540/include/soc/spi.h new file mode 100644 index 0000000000..543f9b2035 --- /dev/null +++ b/src/soc/sifive/fu540/include/soc/spi.h @@ -0,0 +1,83 @@ +/* + * This file is part of the coreboot project. + * + * Copyright 2018 SiFive, Inc + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef __SOC_SIFIVE_HIFIVE_U_SPI_H__ +#define __SOC_SIFIVE_HIFIVE_U_SPI_H__ +#include <spi-generic.h> + +/* Data Pins: MOSI MISO */ +#define FU540_SPI_PROTO_S 0 +/* Data Pins: DQ0 DQ1 */ +#define FU540_SPI_PROTO_D 1 +/* Data Pins: DQ0 DQ1 DQ2 DQ3 */ +#define FU540_SPI_PROTO_Q 2 + +/* send MSB first */ +#define FU540_SPI_ENDIAN_BIG 0 +/* send LSB first */ +#define FU540_SPI_ENDIAN_LITTLE 1 + +/* inactive state of SCK is logical 0 */ +#define FU540_SPI_PHA_LOW 0 +/* inactive state of SCK is logical 1 */ +#define FU540_SPI_PHA_HIGH 1 + +/* data is sampled on leading edge */ +#define FU540_SPI_POL_LEADING 0 +/* data is sampled on trailing edge */ +#define FU540_SPI_POL_TRAILING 1 + +struct fu540_spi_config { + /* speed of spi interface */ + unsigned int freq; + /* serial clock phase */ + unsigned int pha; + /* serial clock polarity */ + unsigned int pol; + unsigned int protocol; + unsigned int endianness; + /* up to 8bits */ + unsigned int bits_per_frame; +}; + +/* more detailed spi configuration */ +int fu540_spi_setup(unsigned int bus, unsigned int cs, struct spi_slave *slave, + struct fu540_spi_config *config); + +/* This structure is used to describe the read command of SPI FLASH. */ +struct fu540_spi_mmap_config { + /* enable sending of command */ + unsigned int cmd_en; + /* number of address bytes (0-4) */ + unsigned int addr_len; + /* number of dummy cycles */ + unsigned int pad_cnt; + /* protocol for transmitting command */ + unsigned int cmd_proto; + /* protocol for transmitting address and padding */ + unsigned int addr_proto; + /* protocol for receiving data bytes */ + unsigned int data_proto; + /* value of command byte */ + unsigned int cmd_code; + /* first 8 bits to transmit during dummy cycles */ + unsigned int pad_code; +}; + +int fu540_spi_mmap( + const struct spi_slave *slave, + const struct fu540_spi_mmap_config *config); + +#endif /* __SOC_SIFIVE_HIFIVE_U_SPI_H__ */ |