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1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3  * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
4  */
5 #ifndef __ASM_ARCH_MXC_MXC_I2C_H__
6 #define __ASM_ARCH_MXC_MXC_I2C_H__
7 #include <asm-generic/gpio.h>
8 #include <asm/mach-imx/iomux-v3.h>
9 
10 struct i2c_pin_ctrl {
11 	iomux_v3_cfg_t i2c_mode;
12 	iomux_v3_cfg_t gpio_mode;
13 	unsigned char gp;
14 	unsigned char spare;
15 };
16 
17 struct i2c_pads_info {
18 	struct i2c_pin_ctrl scl;
19 	struct i2c_pin_ctrl sda;
20 };
21 
22 /*
23  * Information about i2c controller
24  * struct mxc_i2c_bus - information about the i2c[x] bus
25  * @index: i2c bus index
26  * @base: Address of I2C bus controller
27  * @driver_data: Flags for different platforms, such as I2C_QUIRK_FLAG.
28  * @speed: Speed of I2C bus
29  * @pads_info: pinctrl info for this i2c bus, will be used when pinctrl is ok.
30  * The following two is only to be compatible with non-DM part.
31  * @idle_bus_fn: function to force bus idle
32  * @idle_bus_data: parameter for idle_bus_fun
33  * For DM:
34  * bus: The device structure for i2c bus controller
35  * scl-gpio: specify the gpio related to SCL pin
36  * sda-gpio: specify the gpio related to SDA pin
37  */
38 struct mxc_i2c_bus {
39 	/*
40 	 * board file can use this index to locate which i2c_pads_info is for
41 	 * i2c_idle_bus. When pinmux is implement, this entry can be
42 	 * discarded. Here we do not use dev->seq, because we do not want to
43 	 * export device to board file.
44 	 */
45 	int index;
46 	ulong base;
47 	ulong driver_data;
48 	int speed;
49 	struct i2c_pads_info *pads_info;
50 #ifndef CONFIG_DM_I2C
51 	int (*idle_bus_fn)(void *p);
52 	void *idle_bus_data;
53 #else
54 	struct udevice *bus;
55 	/* Use gpio to force bus idle when bus state is abnormal */
56 	struct gpio_desc scl_gpio;
57 	struct gpio_desc sda_gpio;
58 #endif
59 };
60 
61 #if defined(CONFIG_MX6QDL)
62 #define I2C_PADS(name, scl_i2c, scl_gpio, scl_gp, sda_i2c, sda_gpio, sda_gp) \
63 	struct i2c_pads_info mx6q_##name = {		\
64 		.scl = {				\
65 			.i2c_mode = MX6Q_##scl_i2c,	\
66 			.gpio_mode = MX6Q_##scl_gpio,	\
67 			.gp = scl_gp,			\
68 		},					\
69 		.sda = {				\
70 			.i2c_mode = MX6Q_##sda_i2c,	\
71 			.gpio_mode = MX6Q_##sda_gpio,	\
72 			.gp = sda_gp,			\
73 		}					\
74 	};						\
75 	struct i2c_pads_info mx6s_##name = {		\
76 		.scl = {				\
77 			.i2c_mode = MX6DL_##scl_i2c,	\
78 			.gpio_mode = MX6DL_##scl_gpio,	\
79 			.gp = scl_gp,			\
80 		},					\
81 		.sda = {				\
82 			.i2c_mode = MX6DL_##sda_i2c,	\
83 			.gpio_mode = MX6DL_##sda_gpio,	\
84 			.gp = sda_gp,			\
85 		}					\
86 	};
87 
88 
89 #define I2C_PADS_INFO(name)	\
90 	(is_mx6dq() || is_mx6dqp()) ? &mx6q_##name : &mx6s_##name
91 #endif
92 
93 int setup_i2c(unsigned i2c_index, int speed, int slave_addr,
94 	      struct i2c_pads_info *p);
95 void bus_i2c_init(int index, int speed, int slave_addr,
96 		int (*idle_bus_fn)(void *p), void *p);
97 int force_idle_bus(void *priv);
98 int i2c_idle_bus(struct mxc_i2c_bus *i2c_bus);
99 #endif
100