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/* SPDX-License-Identifier: GPL-2.0 */
/* CAN bus driver for Microchip 25XXFD CAN Controller with SPI Interface
*
* Copyright 2019 Martin Sperl <kernel@martin.sperl.org>
*/
#ifndef __MCP25XXFD_CMD_H
#define __MCP25XXFD_CMD_H
#include <linux/byteorder/generic.h>
#include <linux/spi/spi.h>
/* SPI commands */
#define MCP25XXFD_INSTRUCTION_RESET 0x0000
#define MCP25XXFD_INSTRUCTION_READ 0x3000
#define MCP25XXFD_INSTRUCTION_WRITE 0x2000
#define MCP25XXFD_INSTRUCTION_READ_CRC 0xB000
#define MCP25XXFD_INSTRUCTION_WRITE_CRC 0xA000
#define MCP25XXFD_INSTRUCTION_WRITE_SAVE 0xC000
#define MCP25XXFD_ADDRESS_MASK 0x0fff
/* a bit to use CRC commands if possible */
#define MCP25XXFD_ADDRESS_WITH_CRC BIT(31)
static inline void mcp25xxfd_cmd_convert_to_cpu(u32 *data, int n)
{
le32_to_cpu_array(data, n);
}
static inline void mcp25xxfd_cmd_convert_from_cpu(u32 *data, int n)
{
cpu_to_le32_array(data, n);
}
static inline void mcp25xxfd_cmd_calc(u16 cmd, u16 addr, u8 *data)
{
cmd |= addr & MCP25XXFD_ADDRESS_MASK;
data[0] = cmd >> 8;
data[1] = cmd;
}
static inline int mcp25xxfd_cmd_first_byte(u32 mask)
{
return (mask & 0x0000ffff) ?
((mask & 0x000000ff) ? 0 : 1) :
((mask & 0x00ff0000) ? 2 : 3);
}
static inline int mcp25xxfd_cmd_last_byte(u32 mask)
{
return (mask & 0xffff0000) ?
((mask & 0xff000000) ? 3 : 2) :
((mask & 0x0000ff00) ? 1 : 0);
}
int mcp25xxfd_cmd_readn(struct spi_device *spi, u32 reg,
void *data, int n);
int mcp25xxfd_cmd_read_mask(struct spi_device *spi, u32 reg,
u32 *data, u32 mask);
static inline int mcp25xxfd_cmd_read(struct spi_device *spi, u32 reg,
u32 *data)
{
return mcp25xxfd_cmd_read_mask(spi, reg, data, -1);
}
int mcp25xxfd_cmd_read_regs(struct spi_device *spi, u32 reg,
u32 *data, u32 bytes);
int mcp25xxfd_cmd_writen(struct spi_device *spi, u32 reg,
void *data, int n);
int mcp25xxfd_cmd_write_mask(struct spi_device *spi, u32 reg,
u32 data, u32 mask);
static inline int mcp25xxfd_cmd_write(struct spi_device *spi, u32 reg,
u32 data)
{
return mcp25xxfd_cmd_write_mask(spi, reg, data, -1);
}
int mcp25xxfd_cmd_write_regs(struct spi_device *spi, u32 reg,
u32 *data, u32 bytes);
int mcp25xxfd_cmd_reset(struct spi_device *spi);
#endif /* __MCP25XXFD_CMD_H */
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