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esp32s2: drivers: serial: add minimal uart driver

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based on uart rom functions, also enable console driver
on top of this driver, which enables logging

Signed-off-by: Glauber Maroto Ferreira <glauber.ferreira@espressif.com>
This commit is contained in:
Glauber Maroto Ferreira 2021-08-05 14:05:18 -03:00 • committed by Christopher Friedt
commit 8e865a7a88
9 changed files with 122 additions and 0 deletions
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1
CODEOWNERS
View file

@ -318,6 +318,7 @@
/drivers/serial/Kconfig.test @str4t0m
/drivers/serial/serial_test.c @str4t0m
/drivers/serial/*esp32c3* @uLipe
/drivers/serial/*esp32s2* @glaubermaroto
/drivers/disk/ @jfischer-no
/drivers/disk/sdmmc_sdhc.h @JunYangNXP
/drivers/disk/sdmmc_spi.c @JunYangNXP

7
boards/xtensa/esp32s2_saola/esp32s2_saola.dts
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@ -14,5 +14,12 @@
chosen {
zephyr,sram = &sram0;
zephyr,console = &uart0;
zephyr,shell-uart = &uart0;
};
};
&uart0 {
status = "okay";
current-speed = <115200>;
};

5
boards/xtensa/esp32s2_saola/esp32s2_saola_defconfig
View file

@ -8,6 +8,11 @@ CONFIG_MAIN_STACK_SIZE=2048
CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC=240000000
CONFIG_CONSOLE=y
CONFIG_SERIAL=y
CONFIG_UART_CONSOLE=y
CONFIG_UART_ROM_ESP32S2=y
CONFIG_XTENSA_USE_CORE_CRT1=n
CONFIG_GEN_ISR_TABLES=y

1
drivers/serial/CMakeLists.txt
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@ -9,6 +9,7 @@ zephyr_library_sources_ifdef(CONFIG_UART_CC32XX uart_cc32xx.c)
zephyr_library_sources_ifdef(CONFIG_UART_CMSDK_APB uart_cmsdk_apb.c)
zephyr_library_sources_ifdef(CONFIG_UART_ESP32 uart_esp32.c)
zephyr_library_sources_ifdef(CONFIG_UART_ROM_ESP32C3 uart_rom_esp32c3.c)
zephyr_library_sources_ifdef(CONFIG_UART_ROM_ESP32S2 uart_rom_esp32s2.c)
zephyr_library_sources_ifdef(CONFIG_UART_SIFIVE uart_sifive.c)
zephyr_library_sources_ifdef(CONFIG_UART_GECKO uart_gecko.c)
zephyr_library_sources_ifdef(CONFIG_LEUART_GECKO leuart_gecko.c)

2
drivers/serial/Kconfig
View file

@ -123,6 +123,8 @@ source "drivers/serial/Kconfig.esp32"
source "drivers/serial/Kconfig.esp32c3_rom"
source "drivers/serial/Kconfig.esp32s2_rom"
source "drivers/serial/Kconfig.gecko"
source "drivers/serial/Kconfig.leuart_gecko"

10
drivers/serial/Kconfig.esp32s2_rom Normal file
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@ -0,0 +1,10 @@
# Copyright (c) 2021 Espressif Systems (Shanghai) Co., Ltd.
# SPDX-License-Identifier: Apache-2.0
config UART_ROM_ESP32S2
bool "ESP32S2 ROM UART driver"
default y
select SERIAL_HAS_DRIVER
depends on SOC_ESP32S2
help
Enable the ESP32S2 UART using ROM routines.

57
drivers/serial/uart_rom_esp32s2.c Normal file
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@ -0,0 +1,57 @@
/*
* Copyright (c) 2021 Espressif Systems (Shanghai) Co., Ltd.
*
* SPDX-License-Identifier: Apache-2.0
*/
#define DT_DRV_COMPAT espressif_esp32s2_uart
/* Include esp-idf headers first to avoid redefining BIT() macro */
#include <soc.h>
#include <esp_attr.h>
#include <device.h>
#include <drivers/uart.h>
#include <drivers/clock_control.h>
static int uart_rom_esp32s2_poll_in(const struct device *dev, unsigned char *p_char)
{
ARG_UNUSED(dev);
return (int)esp_rom_uart_rx_one_char(p_char);
}
static IRAM_ATTR void uart_rom_esp32s2_poll_out(const struct device *dev,
unsigned char c)
{
ARG_UNUSED(dev);
esp_rom_uart_tx_one_char(c);
}
static int uart_rom_esp32s2_poll_err_check(const struct device *dev)
{
ARG_UNUSED(dev);
return 0;
}
static int uart_rom_esp32s2_init(const struct device *dev)
{
ARG_UNUSED(dev);
return 0;
}
static const DRAM_ATTR struct uart_driver_api uart_rom_esp32s2_api = {
.poll_in = uart_rom_esp32s2_poll_in,
.poll_out = uart_rom_esp32s2_poll_out,
.err_check = uart_rom_esp32s2_poll_err_check,
};
#define ESP32S2_ROM_UART_INIT(idx) \
DEVICE_DT_DEFINE(DT_NODELABEL(uart##idx), \
&uart_rom_esp32s2_init, \
NULL, \
NULL, \
NULL, \
PRE_KERNEL_1, \
CONFIG_KERNEL_INIT_PRIORITY_DEVICE, \
&uart_rom_esp32s2_api); \
DT_INST_FOREACH_STATUS_OKAY(ESP32S2_ROM_UART_INIT)

32
dts/bindings/serial/espressif,esp32s2-uart.yaml Normal file
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@ -0,0 +1,32 @@
description: ESP32S2 UART
compatible: "espressif,esp32s2-uart"
include: uart-controller.yaml
properties:
reg:
required: true
interrupts:
required: false
tx-pin:
type: int
description: TX pin
required: false
rx-pin:
type: int
description: RX pin
required: false
rts-pin:
type: int
description: RTS pin
required: false
cts-pin:
type: int
description: CTS pin
required: false

7
dts/xtensa/espressif/esp32s2.dtsi
View file

@ -30,6 +30,13 @@
compatible = "mmio-sram";
reg = <0x3ffb0000 0x50000>;
};
uart0: uart@3f400000 {
compatible = "espressif,esp32s2-uart";
reg = <0x3f400000 0x400>;
label = "UART_0";
status = "disabled";
};
};
};