This implements an earlycon for Actions Semi S500/S900 SoCs. Based on LeMaker linux-actions tree. Signed-off-by: Andreas Färber <afaerber@xxxxxxx> --- drivers/tty/serial/Kconfig | 19 ++++++ drivers/tty/serial/Makefile | 1 + drivers/tty/serial/owl-uart.c | 135 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 155 insertions(+) create mode 100644 drivers/tty/serial/owl-uart.c diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig index 6117ac8..9d4213c 100644 --- a/drivers/tty/serial/Kconfig +++ b/drivers/tty/serial/Kconfig @@ -1677,6 +1677,25 @@ config SERIAL_MVEBU_CONSOLE and warnings and which allows logins in single user mode) Otherwise, say 'N'. +config SERIAL_OWL + bool "Actions Semi Owl serial port support" + depends on ARCH_OWL || COMPILE_TEST + select SERIAL_CORE + help + This driver is for Actions Semi S500/S900 SoC's UART. + Say 'Y' here if you wish to use the on-board serial port. + Otherwise, say 'N'. + +config SERIAL_OWL_CONSOLE + bool "Console on Actions Semi Owl serial port" + depends on SERIAL_OWL=y + select SERIAL_CORE_CONSOLE + select SERIAL_EARLYCON + default y + help + Say 'Y' here if you wish to use Actions Semi S500/S900 UART as the + system console. + endmenu config SERIAL_MCTRL_GPIO diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile index 2d6288b..91f3571 100644 --- a/drivers/tty/serial/Makefile +++ b/drivers/tty/serial/Makefile @@ -91,6 +91,7 @@ obj-$(CONFIG_SERIAL_STM32) += stm32-usart.o obj-$(CONFIG_SERIAL_MVEBU_UART) += mvebu-uart.o obj-$(CONFIG_SERIAL_PIC32) += pic32_uart.o obj-$(CONFIG_SERIAL_MPS2_UART) += mps2-uart.o +obj-$(CONFIG_SERIAL_OWL) += owl-uart.o # GPIOLIB helpers for modem control lines obj-$(CONFIG_SERIAL_MCTRL_GPIO) += serial_mctrl_gpio.o diff --git a/drivers/tty/serial/owl-uart.c b/drivers/tty/serial/owl-uart.c new file mode 100644 index 0000000..f8b1bb6 --- /dev/null +++ b/drivers/tty/serial/owl-uart.c @@ -0,0 +1,135 @@ +/* + * Actions Semi Owl family serial console + * + * Copyright 2013 Actions Semi Inc. + * Author: Actions Semi, Inc. + * + * Copyright (c) 2016-2017 Andreas Färber + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <linux/console.h> +#include <linux/delay.h> +#include <linux/io.h> +#include <linux/module.h> +#include <linux/of.h> +#include <linux/platform_device.h> +#include <linux/serial.h> +#include <linux/serial_core.h> + +#define OWL_UART_CTL 0x000 +#define OWL_UART_TXDAT 0x008 +#define OWL_UART_STAT 0x00c + +#define OWL_UART_CTL_TRFS_TX (1 << 14) +#define OWL_UART_CTL_EN (1 << 15) +#define OWL_UART_CTL_RXIE (1 << 18) +#define OWL_UART_CTL_TXIE (1 << 19) + +#define OWL_UART_STAT_RIP (1 << 0) +#define OWL_UART_STAT_TIP (1 << 1) +#define OWL_UART_STAT_TFFU (1 << 6) +#define OWL_UART_STAT_TRFL_MASK (0x1f << 11) +#define OWL_UART_STAT_UTBB (1 << 17) + +static inline void owl_serial_write(struct uart_port *port, u32 val, unsigned int off) +{ + writel(val, port->membase + off); +} + +static inline u32 owl_serial_read(struct uart_port *port, unsigned int off) +{ + return readl(port->membase + off); +} + +#ifdef CONFIG_SERIAL_OWL_CONSOLE + +static void owl_console_putchar(struct uart_port *port, int ch) +{ + if (!port->membase) + return; + + while (owl_serial_read(port, OWL_UART_STAT) & OWL_UART_STAT_TFFU) + cpu_relax(); + + owl_serial_write(port, ch, OWL_UART_TXDAT); +} + +static void owl_serial_port_write(struct uart_port *port, const char *s, + u_int count) +{ + u32 old_ctl, val; + unsigned long flags; + int locked; + + local_irq_save(flags); + + if (port->sysrq) + locked = 0; + else if (oops_in_progress) + locked = spin_trylock(&port->lock); + else { + spin_lock(&port->lock); + locked = 1; + } + + old_ctl = owl_serial_read(port, OWL_UART_CTL); + val = old_ctl | OWL_UART_CTL_TRFS_TX; + /* disable IRQ */ + val &= ~(OWL_UART_CTL_RXIE | OWL_UART_CTL_TXIE); + owl_serial_write(port, val, OWL_UART_CTL); + + uart_console_write(port, s, count, owl_console_putchar); + + /* wait until all contents have been sent out */ + while (owl_serial_read(port, OWL_UART_STAT) & OWL_UART_STAT_TRFL_MASK) + cpu_relax(); + + /* clear IRQ pending */ + val = owl_serial_read(port, OWL_UART_STAT); + val |= OWL_UART_STAT_TIP | OWL_UART_STAT_RIP; + owl_serial_write(port, val, OWL_UART_STAT); + + owl_serial_write(port, old_ctl, OWL_UART_CTL); + + if (locked) + spin_unlock(&port->lock); + + local_irq_restore(flags); +} + +static void owl_serial_early_console_write(struct console *co, + const char *s, + u_int count) +{ + struct earlycon_device *dev = co->data; + + owl_serial_port_write(&dev->port, s, count); +} + +static int __init +owl_serial_early_console_setup(struct earlycon_device *device, const char *opt) +{ + if (!device->port.membase) + return -ENODEV; + + device->con->write = owl_serial_early_console_write; + + return 0; +} +OF_EARLYCON_DECLARE(owl, "acts,owl-uart", + owl_serial_early_console_setup); + +#endif /* CONFIG_SERIAL_OWL_CONSOLE */ -- 2.10.2 -- To unsubscribe from this list: send the line "unsubscribe linux-serial" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
