arch/arm/include/asm/mach-imx/mxc_i2c.h

   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