1 files changed, 102 insertions, 0 deletions
diff --git a/drivers/net/can/spi/mcp25xxfd/mcp25xxfd_cmd.h b/drivers/net/can/spi/mcp25xxfd/mcp25xxfd_cmd.h
new file mode 100644
index 000000000000..01246a6b5a63
--- /dev/null
+++ b/drivers/net/can/spi/mcp25xxfd/mcp25xxfd_cmd.h
@@ -0,0 +1,102 @@
+/* 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 cpu_to_le32_array(u32 *buf, unsigned int words)
+{
+	while (words--) {
+		__cpu_to_le32s(buf);
+		buf++;
+	}
+}
+
+static inline void le32_to_cpu_array(u32 *buf, unsigned int words)
+{
+	while (words--) {
+		__le32_to_cpus(buf);
+		buf++;
+	}
+}
+
+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 */