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

   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_cpu_type(MXC_CPU_MX6Q) || is_cpu_type(MXC_CPU_MX6D)) ? \
  92                                         &mx6q_##name : &mx6s_##name
  93 #endif
  94
  95 int setup_i2c(unsigned i2c_index, int speed, int slave_addr,
  96               struct i2c_pads_info *p);
  97 void bus_i2c_init(int index, int speed, int slave_addr,
  98                 int (*idle_bus_fn)(void *p), void *p);
  99 int force_idle_bus(void *priv);
 100 int i2c_idle_bus(struct mxc_i2c_bus *i2c_bus);
 101 #endif