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50 lines
1.3 KiB
50 lines
1.3 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Copyright 2020 NXP |
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*/ |
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#include <linux/module.h> |
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#include <linux/ioport.h> |
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#include <linux/init.h> |
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#include <linux/serial_core.h> |
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#include <linux/serial.h> |
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#include <linux/delay.h> |
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#include <linux/of.h> |
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#include <linux/io.h> |
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#define URTX0 0x40 /* Transmitter Register */ |
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#define UTS_TXFULL (1<<4) /* TxFIFO full */ |
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#define IMX21_UTS 0xb4 /* UART Test Register on all other i.mx*/ |
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static void imx_uart_console_early_putchar(struct uart_port *port, int ch) |
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{ |
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while (readl_relaxed(port->membase + IMX21_UTS) & UTS_TXFULL) |
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cpu_relax(); |
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writel_relaxed(ch, port->membase + URTX0); |
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} |
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static void imx_uart_console_early_write(struct console *con, const char *s, |
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unsigned count) |
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{ |
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struct earlycon_device *dev = con->data; |
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uart_console_write(&dev->port, s, count, imx_uart_console_early_putchar); |
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} |
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static int __init |
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imx_console_early_setup(struct earlycon_device *dev, const char *opt) |
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{ |
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if (!dev->port.membase) |
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return -ENODEV; |
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dev->con->write = imx_uart_console_early_write; |
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return 0; |
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} |
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OF_EARLYCON_DECLARE(ec_imx6q, "fsl,imx6q-uart", imx_console_early_setup); |
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OF_EARLYCON_DECLARE(ec_imx21, "fsl,imx21-uart", imx_console_early_setup); |
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MODULE_AUTHOR("NXP"); |
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MODULE_DESCRIPTION("IMX earlycon driver"); |
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MODULE_LICENSE("GPL");
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