1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (c) 2010 ASIX Electronics Corporation
4  * Copyright (c) 2020 Samsung Electronics Co., Ltd.
5  *
6  * ASIX AX88796C SPI Fast Ethernet Linux driver
7  */
8 
9 #ifndef _AX88796C_SPI_H
10 #define _AX88796C_SPI_H
11 
12 #include <linux/spi/spi.h>
13 #include <linux/types.h>
14 
15 /* Definition of SPI command */
16 #define AX_SPICMD_WRITE_TXQ		0x02
17 #define AX_SPICMD_READ_REG		0x03
18 #define AX_SPICMD_READ_STATUS		0x05
19 #define AX_SPICMD_READ_RXQ		0x0B
20 #define AX_SPICMD_BIDIR_WRQ		0xB2
21 #define AX_SPICMD_WRITE_REG		0xD8
22 #define AX_SPICMD_EXIT_PWD		0xAB
23 
24 extern const u8 ax88796c_rx_cmd_buf[];
25 extern const u8 ax88796c_tx_cmd_buf[];
26 
27 struct axspi_data {
28 	struct spi_device	*spi;
29 	struct spi_message	rx_msg;
30 	struct spi_transfer	spi_rx_xfer[2];
31 	u8			cmd_buf[6];
32 	u8			rx_buf[6];
33 	u8			comp;
34 };
35 
36 struct spi_status {
37 	u16 isr;
38 	u8 status;
39 #	define AX_STATUS_READY		0x80
40 };
41 
42 int axspi_read_rxq(struct axspi_data *ax_spi, void *data, int len);
43 int axspi_write_txq(const struct axspi_data *ax_spi, void *data, int len);
44 u16 axspi_read_reg(struct axspi_data *ax_spi, u8 reg);
45 int axspi_write_reg(struct axspi_data *ax_spi, u8 reg, u16 value);
46 int axspi_read_status(struct axspi_data *ax_spi, struct spi_status *status);
47 int axspi_wakeup(struct axspi_data *ax_spi);
48 
49 static inline u16 AX_READ(struct axspi_data *ax_spi, u8 offset)
50 {
51 	return axspi_read_reg(ax_spi, offset);
52 }
53 
54 static inline int AX_WRITE(struct axspi_data *ax_spi, u16 value, u8 offset)
55 {
56 	return axspi_write_reg(ax_spi, offset, value);
57 }
58 
59 static inline int AX_READ_STATUS(struct axspi_data *ax_spi,
60 				 struct spi_status *status)
61 {
62 	return axspi_read_status(ax_spi, status);
63 }
64 
65 static inline int AX_WAKEUP(struct axspi_data *ax_spi)
66 {
67 	return axspi_wakeup(ax_spi);
68 }
69 #endif
70