710 lines
19 KiB
C
710 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/****************************************************************************/
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/*
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* mcf.c -- Freescale ColdFire UART driver
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*
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* (C) Copyright 2003-2007, Greg Ungerer <gerg@uclinux.org>
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*/
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/****************************************************************************/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/console.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <linux/serial.h>
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#include <linux/serial_core.h>
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#include <linux/io.h>
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#include <linux/uaccess.h>
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#include <linux/platform_device.h>
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#include <asm/coldfire.h>
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#include <asm/mcfsim.h>
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#include <asm/mcfuart.h>
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#include <asm/nettel.h>
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/****************************************************************************/
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/*
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* Some boards implement the DTR/DCD lines using GPIO lines, most
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* don't. Dummy out the access macros for those that don't. Those
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* that do should define these macros somewhere in there board
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* specific inlude files.
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*/
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#if !defined(mcf_getppdcd)
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#define mcf_getppdcd(p) (1)
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#endif
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#if !defined(mcf_getppdtr)
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#define mcf_getppdtr(p) (1)
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#endif
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#if !defined(mcf_setppdtr)
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#define mcf_setppdtr(p, v) do { } while (0)
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#endif
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/****************************************************************************/
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/*
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* Local per-uart structure.
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*/
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struct mcf_uart {
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struct uart_port port;
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unsigned int sigs; /* Local copy of line sigs */
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unsigned char imr; /* Local IMR mirror */
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};
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/****************************************************************************/
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static unsigned int mcf_tx_empty(struct uart_port *port)
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{
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return (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXEMPTY) ?
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TIOCSER_TEMT : 0;
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}
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/****************************************************************************/
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static unsigned int mcf_get_mctrl(struct uart_port *port)
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{
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struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
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unsigned int sigs;
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sigs = (readb(port->membase + MCFUART_UIPR) & MCFUART_UIPR_CTS) ?
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0 : TIOCM_CTS;
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sigs |= (pp->sigs & TIOCM_RTS);
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sigs |= (mcf_getppdcd(port->line) ? TIOCM_CD : 0);
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sigs |= (mcf_getppdtr(port->line) ? TIOCM_DTR : 0);
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return sigs;
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}
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/****************************************************************************/
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static void mcf_set_mctrl(struct uart_port *port, unsigned int sigs)
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{
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struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
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pp->sigs = sigs;
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mcf_setppdtr(port->line, (sigs & TIOCM_DTR));
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if (sigs & TIOCM_RTS)
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writeb(MCFUART_UOP_RTS, port->membase + MCFUART_UOP1);
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else
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writeb(MCFUART_UOP_RTS, port->membase + MCFUART_UOP0);
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}
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/****************************************************************************/
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static void mcf_start_tx(struct uart_port *port)
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{
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struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
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if (port->rs485.flags & SER_RS485_ENABLED) {
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/* Enable Transmitter */
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writeb(MCFUART_UCR_TXENABLE, port->membase + MCFUART_UCR);
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/* Manually assert RTS */
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writeb(MCFUART_UOP_RTS, port->membase + MCFUART_UOP1);
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}
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pp->imr |= MCFUART_UIR_TXREADY;
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writeb(pp->imr, port->membase + MCFUART_UIMR);
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}
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/****************************************************************************/
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static void mcf_stop_tx(struct uart_port *port)
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{
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struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
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pp->imr &= ~MCFUART_UIR_TXREADY;
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writeb(pp->imr, port->membase + MCFUART_UIMR);
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}
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/****************************************************************************/
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static void mcf_stop_rx(struct uart_port *port)
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{
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struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
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pp->imr &= ~MCFUART_UIR_RXREADY;
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writeb(pp->imr, port->membase + MCFUART_UIMR);
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}
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/****************************************************************************/
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static void mcf_break_ctl(struct uart_port *port, int break_state)
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{
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unsigned long flags;
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spin_lock_irqsave(&port->lock, flags);
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if (break_state == -1)
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writeb(MCFUART_UCR_CMDBREAKSTART, port->membase + MCFUART_UCR);
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else
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writeb(MCFUART_UCR_CMDBREAKSTOP, port->membase + MCFUART_UCR);
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spin_unlock_irqrestore(&port->lock, flags);
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}
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/****************************************************************************/
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static int mcf_startup(struct uart_port *port)
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{
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struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
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unsigned long flags;
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spin_lock_irqsave(&port->lock, flags);
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/* Reset UART, get it into known state... */
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writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
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writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
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/* Enable the UART transmitter and receiver */
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writeb(MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE,
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port->membase + MCFUART_UCR);
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/* Enable RX interrupts now */
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pp->imr = MCFUART_UIR_RXREADY;
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writeb(pp->imr, port->membase + MCFUART_UIMR);
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spin_unlock_irqrestore(&port->lock, flags);
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return 0;
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}
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/****************************************************************************/
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static void mcf_shutdown(struct uart_port *port)
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{
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struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
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unsigned long flags;
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spin_lock_irqsave(&port->lock, flags);
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/* Disable all interrupts now */
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pp->imr = 0;
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writeb(pp->imr, port->membase + MCFUART_UIMR);
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/* Disable UART transmitter and receiver */
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writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
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writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
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spin_unlock_irqrestore(&port->lock, flags);
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}
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/****************************************************************************/
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static void mcf_set_termios(struct uart_port *port, struct ktermios *termios,
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const struct ktermios *old)
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{
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unsigned long flags;
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unsigned int baud, baudclk;
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#if defined(CONFIG_M5272)
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unsigned int baudfr;
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#endif
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unsigned char mr1, mr2;
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baud = uart_get_baud_rate(port, termios, old, 0, 230400);
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#if defined(CONFIG_M5272)
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baudclk = (MCF_BUSCLK / baud) / 32;
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baudfr = (((MCF_BUSCLK / baud) + 1) / 2) % 16;
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#else
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baudclk = ((MCF_BUSCLK / baud) + 16) / 32;
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#endif
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mr1 = MCFUART_MR1_RXIRQRDY | MCFUART_MR1_RXERRCHAR;
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mr2 = 0;
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switch (termios->c_cflag & CSIZE) {
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case CS5: mr1 |= MCFUART_MR1_CS5; break;
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case CS6: mr1 |= MCFUART_MR1_CS6; break;
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case CS7: mr1 |= MCFUART_MR1_CS7; break;
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case CS8:
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default: mr1 |= MCFUART_MR1_CS8; break;
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}
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if (termios->c_cflag & PARENB) {
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if (termios->c_cflag & CMSPAR) {
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if (termios->c_cflag & PARODD)
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mr1 |= MCFUART_MR1_PARITYMARK;
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else
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mr1 |= MCFUART_MR1_PARITYSPACE;
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} else {
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if (termios->c_cflag & PARODD)
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mr1 |= MCFUART_MR1_PARITYODD;
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else
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mr1 |= MCFUART_MR1_PARITYEVEN;
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}
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} else {
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mr1 |= MCFUART_MR1_PARITYNONE;
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}
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/*
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* FIXME: port->read_status_mask and port->ignore_status_mask
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* need to be initialized based on termios settings for
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* INPCK, IGNBRK, IGNPAR, PARMRK, BRKINT
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*/
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if (termios->c_cflag & CSTOPB)
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mr2 |= MCFUART_MR2_STOP2;
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else
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mr2 |= MCFUART_MR2_STOP1;
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if (termios->c_cflag & CRTSCTS) {
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mr1 |= MCFUART_MR1_RXRTS;
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mr2 |= MCFUART_MR2_TXCTS;
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}
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spin_lock_irqsave(&port->lock, flags);
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if (port->rs485.flags & SER_RS485_ENABLED) {
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dev_dbg(port->dev, "Setting UART to RS485\n");
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mr2 |= MCFUART_MR2_TXRTS;
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}
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uart_update_timeout(port, termios->c_cflag, baud);
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writeb(MCFUART_UCR_CMDRESETRX, port->membase + MCFUART_UCR);
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writeb(MCFUART_UCR_CMDRESETTX, port->membase + MCFUART_UCR);
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writeb(MCFUART_UCR_CMDRESETMRPTR, port->membase + MCFUART_UCR);
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writeb(mr1, port->membase + MCFUART_UMR);
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writeb(mr2, port->membase + MCFUART_UMR);
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writeb((baudclk & 0xff00) >> 8, port->membase + MCFUART_UBG1);
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writeb((baudclk & 0xff), port->membase + MCFUART_UBG2);
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#if defined(CONFIG_M5272)
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writeb((baudfr & 0x0f), port->membase + MCFUART_UFPD);
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#endif
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writeb(MCFUART_UCSR_RXCLKTIMER | MCFUART_UCSR_TXCLKTIMER,
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port->membase + MCFUART_UCSR);
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writeb(MCFUART_UCR_RXENABLE | MCFUART_UCR_TXENABLE,
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port->membase + MCFUART_UCR);
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spin_unlock_irqrestore(&port->lock, flags);
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}
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/****************************************************************************/
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static void mcf_rx_chars(struct mcf_uart *pp)
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{
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struct uart_port *port = &pp->port;
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unsigned char status, ch, flag;
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while ((status = readb(port->membase + MCFUART_USR)) & MCFUART_USR_RXREADY) {
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ch = readb(port->membase + MCFUART_URB);
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flag = TTY_NORMAL;
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port->icount.rx++;
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if (status & MCFUART_USR_RXERR) {
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writeb(MCFUART_UCR_CMDRESETERR,
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port->membase + MCFUART_UCR);
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if (status & MCFUART_USR_RXBREAK) {
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port->icount.brk++;
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if (uart_handle_break(port))
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continue;
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} else if (status & MCFUART_USR_RXPARITY) {
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port->icount.parity++;
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} else if (status & MCFUART_USR_RXOVERRUN) {
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port->icount.overrun++;
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} else if (status & MCFUART_USR_RXFRAMING) {
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port->icount.frame++;
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}
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status &= port->read_status_mask;
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if (status & MCFUART_USR_RXBREAK)
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flag = TTY_BREAK;
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else if (status & MCFUART_USR_RXPARITY)
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flag = TTY_PARITY;
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else if (status & MCFUART_USR_RXFRAMING)
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flag = TTY_FRAME;
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}
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if (uart_handle_sysrq_char(port, ch))
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continue;
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uart_insert_char(port, status, MCFUART_USR_RXOVERRUN, ch, flag);
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}
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tty_flip_buffer_push(&port->state->port);
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}
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/****************************************************************************/
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static void mcf_tx_chars(struct mcf_uart *pp)
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{
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struct uart_port *port = &pp->port;
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struct circ_buf *xmit = &port->state->xmit;
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if (port->x_char) {
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/* Send special char - probably flow control */
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writeb(port->x_char, port->membase + MCFUART_UTB);
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port->x_char = 0;
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port->icount.tx++;
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return;
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}
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while (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY) {
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if (uart_circ_empty(xmit))
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break;
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writeb(xmit->buf[xmit->tail], port->membase + MCFUART_UTB);
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xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE -1);
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port->icount.tx++;
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}
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if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
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uart_write_wakeup(port);
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if (uart_circ_empty(xmit)) {
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mcf_stop_tx(port);
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/* Disable TX to negate RTS automatically */
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if (port->rs485.flags & SER_RS485_ENABLED)
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writeb(MCFUART_UCR_TXDISABLE,
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port->membase + MCFUART_UCR);
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}
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}
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/****************************************************************************/
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static irqreturn_t mcf_interrupt(int irq, void *data)
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{
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struct uart_port *port = data;
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struct mcf_uart *pp = container_of(port, struct mcf_uart, port);
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unsigned int isr;
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irqreturn_t ret = IRQ_NONE;
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isr = readb(port->membase + MCFUART_UISR) & pp->imr;
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spin_lock(&port->lock);
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if (isr & MCFUART_UIR_RXREADY) {
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mcf_rx_chars(pp);
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ret = IRQ_HANDLED;
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}
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if (isr & MCFUART_UIR_TXREADY) {
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mcf_tx_chars(pp);
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ret = IRQ_HANDLED;
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}
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spin_unlock(&port->lock);
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return ret;
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}
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/****************************************************************************/
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static void mcf_config_port(struct uart_port *port, int flags)
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{
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port->type = PORT_MCF;
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port->fifosize = MCFUART_TXFIFOSIZE;
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/* Clear mask, so no surprise interrupts. */
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writeb(0, port->membase + MCFUART_UIMR);
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if (request_irq(port->irq, mcf_interrupt, 0, "UART", port))
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printk(KERN_ERR "MCF: unable to attach ColdFire UART %d "
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"interrupt vector=%d\n", port->line, port->irq);
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}
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/****************************************************************************/
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static const char *mcf_type(struct uart_port *port)
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{
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return (port->type == PORT_MCF) ? "ColdFire UART" : NULL;
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}
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/****************************************************************************/
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static int mcf_request_port(struct uart_port *port)
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{
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/* UARTs always present */
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return 0;
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}
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/****************************************************************************/
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static void mcf_release_port(struct uart_port *port)
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{
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/* Nothing to release... */
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}
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/****************************************************************************/
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static int mcf_verify_port(struct uart_port *port, struct serial_struct *ser)
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{
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if ((ser->type != PORT_UNKNOWN) && (ser->type != PORT_MCF))
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return -EINVAL;
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return 0;
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}
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/****************************************************************************/
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/* Enable or disable the RS485 support */
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static int mcf_config_rs485(struct uart_port *port, struct ktermios *termios,
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struct serial_rs485 *rs485)
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{
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unsigned char mr1, mr2;
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/* Get mode registers */
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mr1 = readb(port->membase + MCFUART_UMR);
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mr2 = readb(port->membase + MCFUART_UMR);
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if (rs485->flags & SER_RS485_ENABLED) {
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dev_dbg(port->dev, "Setting UART to RS485\n");
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/* Automatically negate RTS after TX completes */
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mr2 |= MCFUART_MR2_TXRTS;
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} else {
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dev_dbg(port->dev, "Setting UART to RS232\n");
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mr2 &= ~MCFUART_MR2_TXRTS;
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}
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writeb(mr1, port->membase + MCFUART_UMR);
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writeb(mr2, port->membase + MCFUART_UMR);
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return 0;
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}
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static const struct serial_rs485 mcf_rs485_supported = {
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.flags = SER_RS485_ENABLED | SER_RS485_RTS_AFTER_SEND,
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};
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/****************************************************************************/
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/*
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* Define the basic serial functions we support.
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*/
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static const struct uart_ops mcf_uart_ops = {
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.tx_empty = mcf_tx_empty,
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.get_mctrl = mcf_get_mctrl,
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.set_mctrl = mcf_set_mctrl,
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.start_tx = mcf_start_tx,
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.stop_tx = mcf_stop_tx,
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.stop_rx = mcf_stop_rx,
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.break_ctl = mcf_break_ctl,
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.startup = mcf_startup,
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.shutdown = mcf_shutdown,
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.set_termios = mcf_set_termios,
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.type = mcf_type,
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.request_port = mcf_request_port,
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.release_port = mcf_release_port,
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.config_port = mcf_config_port,
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.verify_port = mcf_verify_port,
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};
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static struct mcf_uart mcf_ports[10];
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#define MCF_MAXPORTS ARRAY_SIZE(mcf_ports)
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/****************************************************************************/
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#if defined(CONFIG_SERIAL_MCF_CONSOLE)
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/****************************************************************************/
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int __init early_mcf_setup(struct mcf_platform_uart *platp)
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{
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struct uart_port *port;
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int i;
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for (i = 0; ((i < MCF_MAXPORTS) && (platp[i].mapbase)); i++) {
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port = &mcf_ports[i].port;
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port->line = i;
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port->type = PORT_MCF;
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|
port->mapbase = platp[i].mapbase;
|
|
port->membase = (platp[i].membase) ? platp[i].membase :
|
|
(unsigned char __iomem *) port->mapbase;
|
|
port->iotype = SERIAL_IO_MEM;
|
|
port->irq = platp[i].irq;
|
|
port->uartclk = MCF_BUSCLK;
|
|
port->flags = UPF_BOOT_AUTOCONF;
|
|
port->rs485_config = mcf_config_rs485;
|
|
port->rs485_supported = mcf_rs485_supported;
|
|
port->ops = &mcf_uart_ops;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
|
|
static void mcf_console_putc(struct console *co, const char c)
|
|
{
|
|
struct uart_port *port = &(mcf_ports + co->index)->port;
|
|
int i;
|
|
|
|
for (i = 0; (i < 0x10000); i++) {
|
|
if (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY)
|
|
break;
|
|
}
|
|
writeb(c, port->membase + MCFUART_UTB);
|
|
for (i = 0; (i < 0x10000); i++) {
|
|
if (readb(port->membase + MCFUART_USR) & MCFUART_USR_TXREADY)
|
|
break;
|
|
}
|
|
}
|
|
|
|
/****************************************************************************/
|
|
|
|
static void mcf_console_write(struct console *co, const char *s, unsigned int count)
|
|
{
|
|
for (; (count); count--, s++) {
|
|
mcf_console_putc(co, *s);
|
|
if (*s == '\n')
|
|
mcf_console_putc(co, '\r');
|
|
}
|
|
}
|
|
|
|
/****************************************************************************/
|
|
|
|
static int __init mcf_console_setup(struct console *co, char *options)
|
|
{
|
|
struct uart_port *port;
|
|
int baud = CONFIG_SERIAL_MCF_BAUDRATE;
|
|
int bits = 8;
|
|
int parity = 'n';
|
|
int flow = 'n';
|
|
|
|
if ((co->index < 0) || (co->index >= MCF_MAXPORTS))
|
|
co->index = 0;
|
|
port = &mcf_ports[co->index].port;
|
|
if (port->membase == 0)
|
|
return -ENODEV;
|
|
|
|
if (options)
|
|
uart_parse_options(options, &baud, &parity, &bits, &flow);
|
|
|
|
return uart_set_options(port, co, baud, parity, bits, flow);
|
|
}
|
|
|
|
/****************************************************************************/
|
|
|
|
static struct uart_driver mcf_driver;
|
|
|
|
static struct console mcf_console = {
|
|
.name = "ttyS",
|
|
.write = mcf_console_write,
|
|
.device = uart_console_device,
|
|
.setup = mcf_console_setup,
|
|
.flags = CON_PRINTBUFFER,
|
|
.index = -1,
|
|
.data = &mcf_driver,
|
|
};
|
|
|
|
static int __init mcf_console_init(void)
|
|
{
|
|
register_console(&mcf_console);
|
|
return 0;
|
|
}
|
|
|
|
console_initcall(mcf_console_init);
|
|
|
|
#define MCF_CONSOLE &mcf_console
|
|
|
|
/****************************************************************************/
|
|
#else
|
|
/****************************************************************************/
|
|
|
|
#define MCF_CONSOLE NULL
|
|
|
|
/****************************************************************************/
|
|
#endif /* CONFIG_SERIAL_MCF_CONSOLE */
|
|
/****************************************************************************/
|
|
|
|
/*
|
|
* Define the mcf UART driver structure.
|
|
*/
|
|
static struct uart_driver mcf_driver = {
|
|
.owner = THIS_MODULE,
|
|
.driver_name = "mcf",
|
|
.dev_name = "ttyS",
|
|
.major = TTY_MAJOR,
|
|
.minor = 64,
|
|
.nr = MCF_MAXPORTS,
|
|
.cons = MCF_CONSOLE,
|
|
};
|
|
|
|
/****************************************************************************/
|
|
|
|
static int mcf_probe(struct platform_device *pdev)
|
|
{
|
|
struct mcf_platform_uart *platp = dev_get_platdata(&pdev->dev);
|
|
struct uart_port *port;
|
|
int i;
|
|
|
|
for (i = 0; ((i < MCF_MAXPORTS) && (platp[i].mapbase)); i++) {
|
|
port = &mcf_ports[i].port;
|
|
|
|
port->line = i;
|
|
port->type = PORT_MCF;
|
|
port->mapbase = platp[i].mapbase;
|
|
port->membase = (platp[i].membase) ? platp[i].membase :
|
|
(unsigned char __iomem *) platp[i].mapbase;
|
|
port->dev = &pdev->dev;
|
|
port->iotype = SERIAL_IO_MEM;
|
|
port->irq = platp[i].irq;
|
|
port->uartclk = MCF_BUSCLK;
|
|
port->ops = &mcf_uart_ops;
|
|
port->flags = UPF_BOOT_AUTOCONF;
|
|
port->rs485_config = mcf_config_rs485;
|
|
port->rs485_supported = mcf_rs485_supported;
|
|
port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_MCF_CONSOLE);
|
|
|
|
uart_add_one_port(&mcf_driver, port);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
|
|
static int mcf_remove(struct platform_device *pdev)
|
|
{
|
|
struct uart_port *port;
|
|
int i;
|
|
|
|
for (i = 0; (i < MCF_MAXPORTS); i++) {
|
|
port = &mcf_ports[i].port;
|
|
if (port)
|
|
uart_remove_one_port(&mcf_driver, port);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
|
|
static struct platform_driver mcf_platform_driver = {
|
|
.probe = mcf_probe,
|
|
.remove = mcf_remove,
|
|
.driver = {
|
|
.name = "mcfuart",
|
|
},
|
|
};
|
|
|
|
/****************************************************************************/
|
|
|
|
static int __init mcf_init(void)
|
|
{
|
|
int rc;
|
|
|
|
printk("ColdFire internal UART serial driver\n");
|
|
|
|
rc = uart_register_driver(&mcf_driver);
|
|
if (rc)
|
|
return rc;
|
|
rc = platform_driver_register(&mcf_platform_driver);
|
|
if (rc) {
|
|
uart_unregister_driver(&mcf_driver);
|
|
return rc;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/****************************************************************************/
|
|
|
|
static void __exit mcf_exit(void)
|
|
{
|
|
platform_driver_unregister(&mcf_platform_driver);
|
|
uart_unregister_driver(&mcf_driver);
|
|
}
|
|
|
|
/****************************************************************************/
|
|
|
|
module_init(mcf_init);
|
|
module_exit(mcf_exit);
|
|
|
|
MODULE_AUTHOR("Greg Ungerer <gerg@uclinux.org>");
|
|
MODULE_DESCRIPTION("Freescale ColdFire UART driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:mcfuart");
|
|
|
|
/****************************************************************************/
|