serial: stm32: add earlycon support

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>

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index f51a807..80321b9 100644 (file)
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -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"

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 8aefb28..f75691e 100644 (file)
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -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,