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arch/risc-v: Add LP I2C for esp32[-c6]

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Add LP I2C peripheral support for esp32c6

Signed-off-by: Eren Terzioglu <eren.terzioglu@espressif.com>
This commit is contained in:
Eren Terzioglu
2025-06-30 11:05:05 +02:00
committed by Xiang Xiao
parent cf1b087504
commit 8995226e0a
6 changed files with 196 additions and 20 deletions
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arch/risc-v/src/common/espressif/Kconfig
+14 -1
View File
@@ -384,6 +384,10 @@ config ESPRESSIF_I2C
bool
default n
config ESPRESSIF_LPI2C
bool
default n
config ESPRESSIF_I2C_PERIPH_MASTER_MODE
bool
depends on (ESPRESSIF_I2C0_MASTER_MODE || ESPRESSIF_I2C1_MASTER_MODE)
@@ -407,6 +411,14 @@ config ESPRESSIF_I2C1
select ESPRESSIF_I2C
select I2C
config ESPRESSIF_LP_I2C0
bool "LP I2C 0"
default n
depends on ARCH_CHIP_ESP32C6
select ESPRESSIF_I2C
select ESPRESSIF_LPI2C
select I2C
choice ESPRESSIF_I2C0_MODE
prompt "I2C0 Mode"
depends on ESPRESSIF_I2C0
@@ -2041,7 +2053,8 @@ if ESPRESSIF_I2C0
config ESPRESSIF_I2C0_SCLPIN
int "I2C0 SCL Pin"
default 6
default 6 if !ESPRESSIF_LPI2C
default 23 if ESPRESSIF_LPI2C
range 0 21
config ESPRESSIF_I2C0_SDAPIN
arch/risc-v/src/common/espressif/esp_i2c.c
+170 -16
View File
@@ -64,11 +64,24 @@
#if defined(CONFIG_ESPRESSIF_ESP32H2) || defined(CONFIG_ESPRESSIF_ESP32C6)
# include "soc/pcr_reg.h"
#endif
#if defined(CONFIG_ESPRESSIF_LP_I2C0)
# include "driver/rtc_io.h"
# include "hal/rtc_io_hal.h"
# include "io_mux.h"
# include "lp_core_i2c.h"
# include "soc/i2c_struct.h"
#endif
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#if defined(CONFIG_ESPRESSIF_LP_I2C0)
# define ESP_LP_I2C0_ID LP_I2C_NUM_0
#else
# define ESP_LP_I2C0_ID I2C_NUM_MAX
#endif
#ifdef CONFIG_ESPRESSIF_ESP32H2
# define SYSTEM_I2C_EXT0_CLK_EN PCR_I2C0_CLK_EN
# define SYSTEM_I2C_EXT0_RST PCR_I2C0_RST_EN
@@ -251,6 +264,8 @@ struct esp_i2c_priv_s
bool ready_read; /* If I2C is ready for receiving data */
soc_module_clk_t clk_src; /* Clock source */
uint32_t clk_freq; /* Current I2C Clock frequency */
/* I2C trace support */
@@ -373,6 +388,7 @@ static struct esp_i2c_priv_s esp_i2c0_priv =
#endif
.error = 0,
.ready_read = false,
.clk_src = I2C_CLK_SRC_DEFAULT,
.clk_freq = 0,
.ctx = &i2c0_ctx
};
@@ -424,11 +440,63 @@ static struct esp_i2c_priv_s esp_i2c1_priv =
#endif
.error = 0,
.ready_read = false,
.clk_src = I2C_CLK_SRC_DEFAULT,
.clk_freq = 0,
.ctx = &i2c1_ctx
};
#endif /* CONFIG_ESPRESSIF_I2C1 */
#ifdef CONFIG_ESPRESSIF_LP_I2C0
i2c_hal_context_t lp_i2c0_ctx =
{
0
};
/* I2C device structure */
static const struct esp_i2c_config_s esp_lp_i2c0_config =
{
.clk_freq = I2C_CLK_FREQ_DEF,
.scl_pin = 7,
.sda_pin = 6,
#ifndef CONFIG_I2C_POLLED
.periph = ETS_LP_I2C_INTR_SOURCE,
.irq = ESP_IRQ_LP_I2C,
#endif
.clk_bit = SYSTEM_I2C_EXT0_CLK_EN,
.rst_bit = SYSTEM_I2C_EXT0_RST,
.scl_insig = 0,
.scl_outsig = 0,
.sda_insig = 0,
.sda_outsig = 0
};
static struct esp_i2c_priv_s esp_lp_i2c0_priv =
{
.ops = &esp_i2c_ops,
.id = LP_I2C_NUM_0,
.module = PERIPH_LP_I2C0_MODULE,
.config = &esp_lp_i2c0_config,
.refs = 0,
.lock = NXMUTEX_INITIALIZER,
#ifndef CONFIG_I2C_POLLED
.sem_isr = SEM_INITIALIZER(0),
#endif
.i2cstate = I2CSTATE_IDLE,
.msgv = NULL,
.msgid = 0,
.bytes = 0,
#ifndef CONFIG_I2C_POLLED
.cpuint = -ENOMEM,
#endif
.error = 0,
.ready_read = false,
.clk_src = LP_I2C_SCLK_DEFAULT,
.clk_freq = 0,
.ctx = &lp_i2c0_ctx
};
#endif /* CONFIG_ESPRESSIF_LP_I2C0 */
/* Trace events strings */
#ifdef CONFIG_I2C_TRACE
@@ -718,25 +786,64 @@ static void esp_i2c_sendstop(struct esp_i2c_priv_s *priv)
static void esp_i2c_init_clock(struct esp_i2c_priv_s *priv,
uint32_t bus_freq)
{
uint32_t src_clk_frequency;
uint32_t src_clk_frequency = 0;
if (bus_freq == priv->clk_freq)
{
return ;
}
i2c_clock_source_t src_clk = I2C_CLK_SRC_DEFAULT;
esp_clk_tree_src_get_freq_hz((soc_module_clk_t)src_clk,
ESP_CLK_TREE_SRC_FREQ_PRECISION_CACHED,
esp_clk_tree_src_get_freq_hz(priv->clk_src,
ESP_CLK_TREE_SRC_FREQ_PRECISION_APPROX,
&src_clk_frequency);
i2c_hal_set_bus_timing(priv->ctx, priv->config->clk_freq,
src_clk, src_clk_frequency);
priv->clk_src, src_clk_frequency);
i2c_hal_master_set_scl_timeout_val(priv->ctx, SCL_TIMEOUT_VAL_US,
src_clk_frequency);
#ifdef CONFIG_ESPRESSIF_LPI2C
PERIPH_RCC_ATOMIC()
{
lp_i2c_ll_set_source_clk(priv->ctx->dev, priv->clk_src);
}
#endif
i2c_ll_update(priv->ctx->dev);
priv->clk_freq = bus_freq;
}
#ifdef CONFIG_ESPRESSIF_LPI2C
/****************************************************************************
* Name: esp_lp_i2c_config_io
*
* Description:
* Configures LP I2C pin.
*
* Parameters:
* priv - Pointer to the private driver struct.
* pin - Pin number to configure.
*
* Return Value:
* None.
*
****************************************************************************/
static void esp_lp_i2c_config_io(const struct esp_i2c_priv_s *priv,
int8_t pin)
{
int lp_pin = rtc_io_num_map[pin];
DEBUGASSERT(lp_pin != -1);
rtc_gpio_set_level(pin, 1);
rtc_gpio_init(pin);
rtc_gpio_set_direction(pin, RTC_GPIO_MODE_INPUT_OUTPUT_OD);
rtc_gpio_pulldown_dis(pin);
rtc_gpio_pullup_en(pin);
}
#endif /* CONFIG_ESPRESSIF_LPI2C */
/****************************************************************************
* Name: esp_i2c_init
*
@@ -752,22 +859,53 @@ static void esp_i2c_init(struct esp_i2c_priv_s *priv)
{
const struct esp_i2c_config_s *config = priv->config;
/* Configure GPIO signals for I2C SCL and SDA pins */
if (priv->id < ESP_LP_I2C0_ID)
{
/* Configure GPIO signals for I2C SCL and SDA pins */
esp_gpiowrite(config->scl_pin, 1);
esp_gpiowrite(config->sda_pin, 1);
esp_gpiowrite(config->scl_pin, 1);
esp_gpiowrite(config->sda_pin, 1);
esp_configgpio(config->scl_pin, INPUT_PULLUP | OUTPUT_OPEN_DRAIN);
esp_gpio_matrix_out(config->scl_pin, config->scl_outsig, 0, 0);
esp_gpio_matrix_in(config->scl_pin, config->scl_insig, 0);
esp_configgpio(config->scl_pin, INPUT_PULLUP | OUTPUT_OPEN_DRAIN);
esp_gpio_matrix_out(config->scl_pin, config->scl_outsig, 0, 0);
esp_gpio_matrix_in(config->scl_pin, config->scl_insig, 0);
esp_configgpio(config->sda_pin, INPUT_PULLUP | OUTPUT_OPEN_DRAIN);
esp_gpio_matrix_out(config->sda_pin, config->sda_outsig, 0, 0);
esp_gpio_matrix_in(config->sda_pin, config->sda_insig, 0);
esp_configgpio(config->sda_pin, INPUT_PULLUP | OUTPUT_OPEN_DRAIN);
esp_gpio_matrix_out(config->sda_pin, config->sda_outsig, 0, 0);
esp_gpio_matrix_in(config->sda_pin, config->sda_insig, 0);
/* Enable I2C hardware */
/* Enable I2C hardware */
periph_module_enable(priv->module);
periph_module_enable(priv->module);
}
#ifdef CONFIG_ESPRESSIF_LPI2C
else
{
PERIPH_RCC_ATOMIC()
{
/* Enable LP I2C bus clock */
lp_i2c_ll_enable_bus_clock(priv->id - LP_I2C_NUM_0, true);
/* Reset LP I2C register */
lp_i2c_ll_reset_register(priv->id - LP_I2C_NUM_0);
}
esp_lp_i2c_config_io(priv, config->scl_pin);
esp_lp_i2c_config_io(priv, config->sda_pin);
const i2c_signal_conn_t *p_i2c_pin = &i2c_periph_signal[priv->id];
#if !SOC_LP_GPIO_MATRIX_SUPPORTED
rtc_gpio_iomux_func_sel(config->sda_pin, p_i2c_pin->iomux_func);
rtc_gpio_iomux_func_sel(config->scl_pin, p_i2c_pin->iomux_func);
#else
/* ToDo: Add LP I2C for LP GPIO Matrix
* supported devices (e.g ESP32-P4)
*/
#endif /* SOC_LP_GPIO_MATRIX_SUPPORTED */
}
#endif
i2c_hal_init(priv->ctx, priv->id);
@@ -783,6 +921,17 @@ static void esp_i2c_init(struct esp_i2c_priv_s *priv)
i2c_ll_master_set_filter(priv->ctx->dev, I2C_FILTER_CYC_NUM_DEF);
#ifdef CONFIG_ESPRESSIF_LPI2C
/* Enable internal open-drain mode for I2C IO lines */
priv->ctx->dev->ctr.sda_force_out = 0;
priv->ctx->dev->ctr.scl_force_out = 0;
/* Configure the I2C master to send a NACK when the Rx FIFO count is full */
i2c_ll_master_rx_full_ack_level(priv->ctx->dev, 1);
#endif
/* Initialize I2C bus clock */
esp_i2c_init_clock(priv, config->clk_freq);
@@ -1531,6 +1680,11 @@ struct i2c_master_s *esp_i2cbus_initialize(int port)
case ESPRESSIF_I2C1:
priv = &esp_i2c1_priv;
break;
#endif
#ifdef CONFIG_ESPRESSIF_LP_I2C0
case ESPRESSIF_LP_I2C0:
priv = &esp_lp_i2c0_priv;
break;
#endif
default:
return NULL;
arch/risc-v/src/common/espressif/esp_i2c.h
+4
View File
@@ -49,6 +49,10 @@
# define ESPRESSIF_I2C1 1
#endif
#ifdef CONFIG_ESPRESSIF_LP_I2C0
# define ESPRESSIF_LP_I2C0 2
#endif
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
arch/risc-v/src/common/espressif/esp_i2c_slave.c
+3 -3
View File
@@ -540,7 +540,7 @@ static void esp_i2c_slave_init(struct esp_i2c_priv_s *priv)
/* Enable I2C hardware */
periph_module_enable(i2c_periph_signal[priv->id].module);
periph_module_enable(PERIPH_I2C0_MODULE);
i2c_hal_init(priv->ctx, priv->id);
@@ -551,7 +551,7 @@ static void esp_i2c_slave_init(struct esp_i2c_priv_s *priv)
/* Initialize I2C Slave */
i2c_hal_slave_init(priv->ctx);
i2c_ll_slave_tx_auto_start_en(priv->ctx->dev, true);
i2c_ll_slave_enable_auto_start(priv->ctx->dev, true);
i2c_ll_set_source_clk(priv->ctx->dev, I2C_CLK_SRC_DEFAULT);
i2c_ll_set_slave_addr(priv->ctx->dev, priv->addr, false);
i2c_ll_set_rxfifo_full_thr(priv->ctx->dev, I2C_FIFO_FULL_THRESH_VAL);
@@ -583,7 +583,7 @@ static void esp_i2c_slave_deinit(struct esp_i2c_priv_s *priv)
const struct esp_i2c_config_s *config = priv->config;
i2c_hal_deinit(priv->ctx);
periph_module_disable(i2c_periph_signal[priv->id].module);
periph_module_disable(PERIPH_I2C0_MODULE);
}
/****************************************************************************
arch/risc-v/src/esp32c6/hal_esp32c6.mk
+1
View File
@@ -212,6 +212,7 @@ CHIP_CSRCS += chip$(DELIM)$(ESP_HAL_3RDPARTY_REPO)$(DELIM)components$(DELIM)soc$
CHIP_CSRCS += chip$(DELIM)$(ESP_HAL_3RDPARTY_REPO)$(DELIM)components$(DELIM)soc$(DELIM)$(CHIP_SERIES)$(DELIM)rtc_io_periph.c
CHIP_CSRCS += chip$(DELIM)$(ESP_HAL_3RDPARTY_REPO)$(DELIM)components$(DELIM)soc$(DELIM)$(CHIP_SERIES)$(DELIM)temperature_sensor_periph.c
CHIP_CSRCS += chip$(DELIM)$(ESP_HAL_3RDPARTY_REPO)$(DELIM)components$(DELIM)soc$(DELIM)${CHIP_SERIES}$(DELIM)uart_periph.c
CHIP_CSRCS += chip$(DELIM)$(ESP_HAL_3RDPARTY_REPO)$(DELIM)components$(DELIM)ulp$(DELIM)lp_core$(DELIM)lp_core_i2c.c
CHIP_CSRCS += chip$(DELIM)$(ESP_HAL_3RDPARTY_REPO)$(DELIM)nuttx$(DELIM)src$(DELIM)components$(DELIM)esp_driver_gpio$(DELIM)src$(DELIM)gpio.c
CHIP_CSRCS += chip$(DELIM)$(ESP_HAL_3RDPARTY_REPO)$(DELIM)nuttx$(DELIM)src$(DELIM)components$(DELIM)esp_driver_gpio$(DELIM)src$(DELIM)rtc_io.c
boards/risc-v/esp32c6/common/src/esp_board_i2c.c
+4
View File
@@ -160,5 +160,9 @@ int board_i2c_init(void)
ret = i2c_slave_driver_init(ESPRESSIF_I2C0_SLAVE, I2C0_SLAVE_ADDR);
#endif
#ifdef CONFIG_ESPRESSIF_LP_I2C0
ret = i2c_driver_init(ESPRESSIF_LP_I2C0);
#endif
return ret;
}