1 /*
2  * Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
3  *
4  * SPDX-License-Identifier:	GPL-2.0+
5  */
6 #ifndef __ASM_ARCH_MXC_MXC_I2C_H__
7 #define __ASM_ARCH_MXC_MXC_I2C_H__
8 #include <asm-generic/gpio.h>
9 #include <asm/mach-imx/iomux-v3.h>
10 
11 struct i2c_pin_ctrl {
12 	iomux_v3_cfg_t i2c_mode;
13 	iomux_v3_cfg_t gpio_mode;
14 	unsigned char gp;
15 	unsigned char spare;
16 };
17 
18 struct i2c_pads_info {
19 	struct i2c_pin_ctrl scl;
20 	struct i2c_pin_ctrl sda;
21 };
22 
23 /*
24  * Information about i2c controller
25  * struct mxc_i2c_bus - information about the i2c[x] bus
26  * @index: i2c bus index
27  * @base: Address of I2C bus controller
28  * @driver_data: Flags for different platforms, such as I2C_QUIRK_FLAG.
29  * @speed: Speed of I2C bus
30  * @pads_info: pinctrl info for this i2c bus, will be used when pinctrl is ok.
31  * The following two is only to be compatible with non-DM part.
32  * @idle_bus_fn: function to force bus idle
33  * @idle_bus_data: parameter for idle_bus_fun
34  * For DM:
35  * bus: The device structure for i2c bus controller
36  * scl-gpio: specify the gpio related to SCL pin
37  * sda-gpio: specify the gpio related to SDA pin
38  */
39 struct mxc_i2c_bus {
40 	/*
41 	 * board file can use this index to locate which i2c_pads_info is for
42 	 * i2c_idle_bus. When pinmux is implement, this entry can be
43 	 * discarded. Here we do not use dev->seq, because we do not want to
44 	 * export device to board file.
45 	 */
46 	int index;
47 	ulong base;
48 	ulong driver_data;
49 	int speed;
50 	struct i2c_pads_info *pads_info;
51 #ifndef CONFIG_DM_I2C
52 	int (*idle_bus_fn)(void *p);
53 	void *idle_bus_data;
54 #else
55 	struct udevice *bus;
56 	/* Use gpio to force bus idle when bus state is abnormal */
57 	struct gpio_desc scl_gpio;
58 	struct gpio_desc sda_gpio;
59 #endif
60 };
61 
62 #if defined(CONFIG_MX6QDL)
63 #define I2C_PADS(name, scl_i2c, scl_gpio, scl_gp, sda_i2c, sda_gpio, sda_gp) \
64 	struct i2c_pads_info mx6q_##name = {		\
65 		.scl = {				\
66 			.i2c_mode = MX6Q_##scl_i2c,	\
67 			.gpio_mode = MX6Q_##scl_gpio,	\
68 			.gp = scl_gp,			\
69 		},					\
70 		.sda = {				\
71 			.i2c_mode = MX6Q_##sda_i2c,	\
72 			.gpio_mode = MX6Q_##sda_gpio,	\
73 			.gp = sda_gp,			\
74 		}					\
75 	};						\
76 	struct i2c_pads_info mx6s_##name = {		\
77 		.scl = {				\
78 			.i2c_mode = MX6DL_##scl_i2c,	\
79 			.gpio_mode = MX6DL_##scl_gpio,	\
80 			.gp = scl_gp,			\
81 		},					\
82 		.sda = {				\
83 			.i2c_mode = MX6DL_##sda_i2c,	\
84 			.gpio_mode = MX6DL_##sda_gpio,	\
85 			.gp = sda_gp,			\
86 		}					\
87 	};
88 
89 
90 #define I2C_PADS_INFO(name)	\
91 	(is_mx6dq() || is_mx6dqp()) ? &mx6q_##name : &mx6s_##name
92 #endif
93 
94 int setup_i2c(unsigned i2c_index, int speed, int slave_addr,
95 	      struct i2c_pads_info *p);
96 void bus_i2c_init(int index, int speed, int slave_addr,
97 		int (*idle_bus_fn)(void *p), void *p);
98 int force_idle_bus(void *priv);
99 int i2c_idle_bus(struct mxc_i2c_bus *i2c_bus);
100 #endif
101