// SPDX-License-Identifier: GPL-2.0 /* * Serial port driver for BCM2835AUX UART * * Copyright (C) 2016 Martin Sperl <[email protected]> * * Based on 8250_lpc18xx.c: * Copyright (C) 2015 Joachim Eastwood <[email protected]> * * The bcm2835aux is capable of RTS auto flow-control, but this driver doesn't * take advantage of it yet. When adding support, be sure not to enable it * simultaneously to rs485. */ #include <linux/clk.h> #include <linux/console.h> #include <linux/io.h> #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> #include <linux/property.h> #include "8250.h" #define BCM2835_AUX_UART_CNTL … #define BCM2835_AUX_UART_CNTL_RXEN … #define BCM2835_AUX_UART_CNTL_TXEN … #define BCM2835_AUX_UART_CNTL_AUTORTS … #define BCM2835_AUX_UART_CNTL_AUTOCTS … #define BCM2835_AUX_UART_CNTL_RTS3 … #define BCM2835_AUX_UART_CNTL_RTS2 … #define BCM2835_AUX_UART_CNTL_RTS1 … #define BCM2835_AUX_UART_CNTL_RTS4 … #define BCM2835_AUX_UART_CNTL_RTSINV … #define BCM2835_AUX_UART_CNTL_CTSINV … /** * struct bcm2835aux_data - driver private data of BCM2835 auxiliary UART * @clk: clock producer of the port's uartclk * @line: index of the port's serial8250_ports[] entry * @cntl: cached copy of CNTL register */ struct bcm2835aux_data { … }; static void bcm2835aux_rs485_start_tx(struct uart_8250_port *up) { … } static void bcm2835aux_rs485_stop_tx(struct uart_8250_port *up) { … } static int bcm2835aux_serial_probe(struct platform_device *pdev) { … } static void bcm2835aux_serial_remove(struct platform_device *pdev) { … } /* * Some UEFI implementations (e.g. tianocore/edk2 for the Raspberry Pi) * describe the miniuart with a base address that encompasses the auxiliary * registers shared between the miniuart and spi. * * This is due to historical reasons, see discussion here: * https://edk2.groups.io/g/devel/topic/87501357#84349 * * We need to add the offset between the miniuart and auxiliary registers * to get the real miniuart base address. */ static const struct property_entry bcm2835_acpi_properties[] = …; static const struct software_node bcm2835_acpi_node = …; static const struct of_device_id bcm2835aux_serial_match[] = …; MODULE_DEVICE_TABLE(of, bcm2835aux_serial_match); static const struct acpi_device_id bcm2835aux_serial_acpi_match[] = …; MODULE_DEVICE_TABLE(acpi, bcm2835aux_serial_acpi_match); static bool bcm2835aux_can_disable_clock(struct device *dev) { … } static int bcm2835aux_suspend(struct device *dev) { … } static int bcm2835aux_resume(struct device *dev) { … } static DEFINE_SIMPLE_DEV_PM_OPS(bcm2835aux_dev_pm_ops, bcm2835aux_suspend, bcm2835aux_resume); static struct platform_driver bcm2835aux_serial_driver = …; module_platform_driver(…) …; #ifdef CONFIG_SERIAL_8250_CONSOLE static int __init early_bcm2835aux_setup(struct earlycon_device *device, const char *options) { … } OF_EARLYCON_DECLARE(…); #endif MODULE_DESCRIPTION(…) …; MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …;
Codebase Browser
linux