// SPDX-License-Identifier: GPL-2.0 /* * MEN 16z135 High Speed UART * * Copyright (C) 2014 MEN Mikroelektronik GmbH (www.men.de) * Author: Johannes Thumshirn <[email protected]> */ #define pr_fmt(fmt) … #include <linux/kernel.h> #include <linux/module.h> #include <linux/interrupt.h> #include <linux/serial_core.h> #include <linux/ioport.h> #include <linux/io.h> #include <linux/tty_flip.h> #include <linux/bitops.h> #include <linux/mcb.h> #define MEN_Z135_MAX_PORTS … #define MEN_Z135_BASECLK … #define MEN_Z135_FIFO_SIZE … #define MEN_Z135_FIFO_WATERMARK … #define MEN_Z135_STAT_REG … #define MEN_Z135_RX_RAM … #define MEN_Z135_TX_RAM … #define MEN_Z135_RX_CTRL … #define MEN_Z135_TX_CTRL … #define MEN_Z135_CONF_REG … #define MEN_Z135_UART_FREQ … #define MEN_Z135_BAUD_REG … #define MEN_Z135_TIMEOUT … #define IRQ_ID(x) … #define MEN_Z135_IER_RXCIEN … #define MEN_Z135_IER_TXCIEN … #define MEN_Z135_IER_RLSIEN … #define MEN_Z135_IER_MSIEN … #define MEN_Z135_ALL_IRQS … #define MEN_Z135_MCR_DTR … #define MEN_Z135_MCR_RTS … #define MEN_Z135_MCR_OUT1 … #define MEN_Z135_MCR_OUT2 … #define MEN_Z135_MCR_LOOP … #define MEN_Z135_MCR_RCFC … #define MEN_Z135_MSR_DCTS … #define MEN_Z135_MSR_DDSR … #define MEN_Z135_MSR_DRI … #define MEN_Z135_MSR_DDCD … #define MEN_Z135_MSR_CTS … #define MEN_Z135_MSR_DSR … #define MEN_Z135_MSR_RI … #define MEN_Z135_MSR_DCD … #define MEN_Z135_LCR_SHIFT … #define MEN_Z135_WL5 … #define MEN_Z135_WL6 … #define MEN_Z135_WL7 … #define MEN_Z135_WL8 … #define MEN_Z135_STB_SHIFT … #define MEN_Z135_NSTB1 … #define MEN_Z135_NSTB2 … #define MEN_Z135_PEN_SHIFT … #define MEN_Z135_PAR_DIS … #define MEN_Z135_PAR_ENA … #define MEN_Z135_PTY_SHIFT … #define MEN_Z135_PTY_ODD … #define MEN_Z135_PTY_EVN … #define MEN_Z135_LSR_DR … #define MEN_Z135_LSR_OE … #define MEN_Z135_LSR_PE … #define MEN_Z135_LSR_FE … #define MEN_Z135_LSR_BI … #define MEN_Z135_LSR_THEP … #define MEN_Z135_LSR_TEXP … #define MEN_Z135_LSR_RXFIFOERR … #define MEN_Z135_IRQ_ID_RLS … #define MEN_Z135_IRQ_ID_RDA … #define MEN_Z135_IRQ_ID_CTI … #define MEN_Z135_IRQ_ID_TSA … #define MEN_Z135_IRQ_ID_MST … #define LCR(x) … #define BYTES_TO_ALIGN(x) … static int line; static int txlvl = …; module_param(txlvl, int, S_IRUGO); MODULE_PARM_DESC(…) …; static int rxlvl = …; module_param(rxlvl, int, S_IRUGO); MODULE_PARM_DESC(…) …; static int align; module_param(align, int, S_IRUGO); MODULE_PARM_DESC(…) …; static uint rx_timeout; module_param(rx_timeout, uint, S_IRUGO); MODULE_PARM_DESC(…) …; struct men_z135_port { … }; #define to_men_z135(port) … /** * men_z135_reg_set() - Set value in register * @uart: The UART port * @addr: Register address * @val: value to set */ static inline void men_z135_reg_set(struct men_z135_port *uart, u32 addr, u32 val) { … } /** * men_z135_reg_clr() - Unset value in register * @uart: The UART port * @addr: Register address * @val: value to clear */ static void men_z135_reg_clr(struct men_z135_port *uart, u32 addr, u32 val) { … } /** * men_z135_handle_modem_status() - Handle change of modem status * @uart: The UART port * * Handle change of modem status register. This is done by reading the "delta" * versions of DCD (Data Carrier Detect) and CTS (Clear To Send). */ static void men_z135_handle_modem_status(struct men_z135_port *uart) { … } static void men_z135_handle_lsr(struct men_z135_port *uart) { … } /** * get_rx_fifo_content() - Get the number of bytes in RX FIFO * @uart: The UART port * * Read RXC register from hardware and return current FIFO fill size. */ static u16 get_rx_fifo_content(struct men_z135_port *uart) { … } /** * men_z135_handle_rx() - RX tasklet routine * @uart: Pointer to struct men_z135_port * * Copy from RX FIFO and acknowledge number of bytes copied. */ static void men_z135_handle_rx(struct men_z135_port *uart) { … } /** * men_z135_handle_tx() - TX tasklet routine * @uart: Pointer to struct men_z135_port * */ static void men_z135_handle_tx(struct men_z135_port *uart) { … } /** * men_z135_intr() - Handle legacy IRQs * @irq: The IRQ number * @data: Pointer to UART port * * Check IIR register to find the cause of the interrupt and handle it. * It is possible that multiple interrupts reason bits are set and reading * the IIR is a destructive read, so we always need to check for all possible * interrupts and handle them. */ static irqreturn_t men_z135_intr(int irq, void *data) { … } /** * men_z135_request_irq() - Request IRQ for 16z135 core * @uart: z135 private uart port structure * * Request an IRQ for 16z135 to use. First try using MSI, if it fails * fall back to using legacy interrupts. */ static int men_z135_request_irq(struct men_z135_port *uart) { … } /** * men_z135_tx_empty() - Handle tx_empty call * @port: The UART port * * This function tests whether the TX FIFO and shifter for the port * described by @port is empty. */ static unsigned int men_z135_tx_empty(struct uart_port *port) { … } /** * men_z135_set_mctrl() - Set modem control lines * @port: The UART port * @mctrl: The modem control lines * * This function sets the modem control lines for a port described by @port * to the state described by @mctrl */ static void men_z135_set_mctrl(struct uart_port *port, unsigned int mctrl) { … } /** * men_z135_get_mctrl() - Get modem control lines * @port: The UART port * * Retruns the current state of modem control inputs. */ static unsigned int men_z135_get_mctrl(struct uart_port *port) { … } /** * men_z135_stop_tx() - Stop transmitting characters * @port: The UART port * * Stop transmitting characters. This might be due to CTS line becomming * inactive or the tty layer indicating we want to stop transmission due to * an XOFF character. */ static void men_z135_stop_tx(struct uart_port *port) { … } /* * men_z135_disable_ms() - Disable Modem Status * port: The UART port * * Enable Modem Status IRQ. */ static void men_z135_disable_ms(struct uart_port *port) { … } /** * men_z135_start_tx() - Start transmitting characters * @port: The UART port * * Start transmitting character. This actually doesn't transmit anything, but * fires off the TX tasklet. */ static void men_z135_start_tx(struct uart_port *port) { … } /** * men_z135_stop_rx() - Stop receiving characters * @port: The UART port * * Stop receiving characters; the port is in the process of being closed. */ static void men_z135_stop_rx(struct uart_port *port) { … } /** * men_z135_enable_ms() - Enable Modem Status * @port: the port * * Enable Modem Status IRQ. */ static void men_z135_enable_ms(struct uart_port *port) { … } static int men_z135_startup(struct uart_port *port) { … } static void men_z135_shutdown(struct uart_port *port) { … } static void men_z135_set_termios(struct uart_port *port, struct ktermios *termios, const struct ktermios *old) { … } static const char *men_z135_type(struct uart_port *port) { … } static void men_z135_release_port(struct uart_port *port) { … } static int men_z135_request_port(struct uart_port *port) { … } static void men_z135_config_port(struct uart_port *port, int type) { … } static int men_z135_verify_port(struct uart_port *port, struct serial_struct *serinfo) { … } static const struct uart_ops men_z135_ops = …; static struct uart_driver men_z135_driver = …; /** * men_z135_probe() - Probe a z135 instance * @mdev: The MCB device * @id: The MCB device ID * * men_z135_probe does the basic setup of hardware resources and registers the * new uart port to the tty layer. */ static int men_z135_probe(struct mcb_device *mdev, const struct mcb_device_id *id) { … } /** * men_z135_remove() - Remove a z135 instance from the system * * @mdev: The MCB device */ static void men_z135_remove(struct mcb_device *mdev) { … } static const struct mcb_device_id men_z135_ids[] = …; MODULE_DEVICE_TABLE(mcb, men_z135_ids); static struct mcb_driver mcb_driver = …; /** * men_z135_init() - Driver Registration Routine * * men_z135_init is the first routine called when the driver is loaded. All it * does is register with the legacy MEN Chameleon subsystem. */ static int __init men_z135_init(void) { … } module_init(…) …; /** * men_z135_exit() - Driver Exit Routine * * men_z135_exit is called just before the driver is removed from memory. */ static void __exit men_z135_exit(void) { … } module_exit(men_z135_exit); MODULE_AUTHOR(…) …; MODULE_LICENSE(…) …; MODULE_DESCRIPTION(…) …; MODULE_ALIAS(…) …; MODULE_IMPORT_NS(…);
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