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serial: stm32: add earlycon support

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Add early console support in stm32 uart driver.

Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>
Signed-off-by: Valentin Caron <valentin.caron@foss.st.com>
Link: https://lore.kernel.org/r/20220419085330.1178925-4-valentin.caron@foss.st.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Valentin Caron 2022-04-19 10:53:30 +02:00 committed by Greg Kroah-Hartman
parent 1f507b3aec
commit 8043b16f52
2 changed files with 52 additions and 0 deletions
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1
drivers/tty/serial/Kconfig
View file

@ -1443,6 +1443,7 @@ config SERIAL_STM32_CONSOLE
bool "Support for console on STM32"
depends on SERIAL_STM32=y
select SERIAL_CORE_CONSOLE
select SERIAL_EARLYCON
config SERIAL_MVEBU_UART
bool "Marvell EBU serial port support"

51
drivers/tty/serial/stm32-usart.c
View file

@ -1761,6 +1761,57 @@ static struct console stm32_console = {
#define STM32_SERIAL_CONSOLE NULL
#endif /* CONFIG_SERIAL_STM32_CONSOLE */
#ifdef CONFIG_SERIAL_EARLYCON
static void early_stm32_usart_console_putchar(struct uart_port *port, unsigned char ch)
{
struct stm32_usart_info *info = port->private_data;
while (!(readl_relaxed(port->membase + info->ofs.isr) & USART_SR_TXE))
cpu_relax();
writel_relaxed(ch, port->membase + info->ofs.tdr);
}
static void early_stm32_serial_write(struct console *console, const char *s, unsigned int count)
{
struct earlycon_device *device = console->data;
struct uart_port *port = &device->port;
uart_console_write(port, s, count, early_stm32_usart_console_putchar);
}
static int __init early_stm32_h7_serial_setup(struct earlycon_device *device, const char *options)
{
if (!(device->port.membase || device->port.iobase))
return -ENODEV;
device->port.private_data = &stm32h7_info;
device->con->write = early_stm32_serial_write;
return 0;
}
static int __init early_stm32_f7_serial_setup(struct earlycon_device *device, const char *options)
{
if (!(device->port.membase || device->port.iobase))
return -ENODEV;
device->port.private_data = &stm32f7_info;
device->con->write = early_stm32_serial_write;
return 0;
}
static int __init early_stm32_f4_serial_setup(struct earlycon_device *device, const char *options)
{
if (!(device->port.membase || device->port.iobase))
return -ENODEV;
device->port.private_data = &stm32f4_info;
device->con->write = early_stm32_serial_write;
return 0;
}
OF_EARLYCON_DECLARE(stm32, "st,stm32h7-uart", early_stm32_h7_serial_setup);
OF_EARLYCON_DECLARE(stm32, "st,stm32f7-uart", early_stm32_f7_serial_setup);
OF_EARLYCON_DECLARE(stm32, "st,stm32-uart", early_stm32_f4_serial_setup);
#endif /* CONFIG_SERIAL_EARLYCON */
static struct uart_driver stm32_usart_driver = {
.driver_name = DRIVER_NAME,
.dev_name = STM32_SERIAL_NAME,