Split imx earlycon driver from imx serial driver "imx.c" as separated driver. imx serial driver can be built as module, but earlycon driver only support build in.
Unified · Split
| @@ -515,6 +515,14 @@ config SERIAL_IMX_CONSOLE · 514 unmodified lines | |||
| 515 | "console=ttymxc0". (Try "man bootparam" or see the documentation of | 515 | "console=ttymxc0". (Try "man bootparam" or see the documentation of |
| 516 | your bootloader about how to pass options to the kernel at boot time.) | 516 | your bootloader about how to pass options to the kernel at boot time.) |
| 517 | 517 | ||
| 518 | config SERIAL_IMX_EARLYCON | ||
| 519 | bool "Earlycon on IMX serial port" | ||
| 520 | depends on OF | ||
| 521 | select SERIAL_EARLYCON | ||
| 522 | help | ||
| 523 | If you have enabled the earlycon on the Freescale IMX | ||
| 524 | CPU you can make it the earlycon by answering Y to this option. | ||
| 525 | |||
| 518 | config SERIAL_UARTLITE | 526 | config SERIAL_UARTLITE |
| 519 | tristate "Xilinx uartlite serial port support" | 527 | tristate "Xilinx uartlite serial port support" |
| 520 | depends on HAS_IOMEM | 528 | depends on HAS_IOMEM |
| @@ -0,0 +1,50 @@ | |||
| 1 | // SPDX-License-Identifier: GPL-2.0+ | ||
| 2 | /* | ||
| 3 | * Copyright 2020 NXP | ||
| 4 | */ | ||
| 5 | |||
| 6 | #include <linux/module.h> | ||
| 7 | #include <linux/ioport.h> | ||
| 8 | #include <linux/init.h> | ||
| 9 | #include <linux/serial_core.h> | ||
| 10 | #include <linux/serial.h> | ||
| 11 | #include <linux/delay.h> | ||
| 12 | #include <linux/of.h> | ||
| 13 | #include <linux/io.h> | ||
| 14 | |||
| 15 | #define URTX0 0x40 /* Transmitter Register */ | ||
| 16 | #define UTS_TXFULL (1<<4) /* TxFIFO full */ | ||
| 17 | #define IMX21_UTS 0xb4 /* UART Test Register on all other i.mx*/ | ||
| 18 | |||
| 19 | static void imx_uart_console_early_putchar(struct uart_port *port, int ch) | ||
| 20 | { | ||
| 21 | while (readl_relaxed(port->membase + IMX21_UTS) & UTS_TXFULL) | ||
| 22 | cpu_relax(); | ||
| 23 | |||
| 24 | writel_relaxed(ch, port->membase + URTX0); | ||
| 25 | } | ||
| 26 | |||
| 27 | static void imx_uart_console_early_write(struct console *con, const char *s, | ||
| 28 | unsigned count) | ||
| 29 | { | ||
| 30 | struct earlycon_device *dev = con->data; | ||
| 31 | |||
| 32 | uart_console_write(&dev->port, s, count, imx_uart_console_early_putchar); | ||
| 33 | } | ||
| 34 | |||
| 35 | static int __init | ||
| 36 | imx_console_early_setup(struct earlycon_device *dev, const char *opt) | ||
| 37 | { | ||
| 38 | if (!dev->port.membase) | ||
| 39 | return -ENODEV; | ||
| 40 | |||
| 41 | dev->con->write = imx_uart_console_early_write; | ||
| 42 | |||
| 43 | return 0; | ||
| 44 | } | ||
| 45 | OF_EARLYCON_DECLARE(ec_imx6q, "fsl,imx6q-uart", imx_console_early_setup); | ||
| 46 | OF_EARLYCON_DECLARE(ec_imx21, "fsl,imx21-uart", imx_console_early_setup); | ||
| 47 | |||
| 48 | MODULE_AUTHOR("NXP"); | ||
| 49 | MODULE_DESCRIPTION("IMX earlycon driver"); | ||
| 50 | MODULE_LICENSE("GPL"); | ||