fbb18a277a
The amba-pl010 hardware does not provide RTS and DTR control lines; it is expected that these will be implemented using GPIO. Allow platforms to supply a function to implement manipulation of modem control lines. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
777 lines
18 KiB
C
777 lines
18 KiB
C
/*
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* linux/drivers/char/amba.c
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*
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* Driver for AMBA serial ports
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*
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* Based on drivers/char/serial.c, by Linus Torvalds, Theodore Ts'o.
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*
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* Copyright 1999 ARM Limited
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* Copyright (C) 2000 Deep Blue Solutions Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* $Id: amba.c,v 1.41 2002/07/28 10:03:27 rmk Exp $
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*
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* This is a generic driver for ARM AMBA-type serial ports. They
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* have a lot of 16550-like features, but are not register compatible.
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* Note that although they do have CTS, DCD and DSR inputs, they do
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* not have an RI input, nor do they have DTR or RTS outputs. If
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* required, these have to be supplied via some other means (eg, GPIO)
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* and hooked into this driver.
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*/
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#include <linux/config.h>
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#if defined(CONFIG_SERIAL_AMBA_PL010_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
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#define SUPPORT_SYSRQ
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#endif
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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/console.h>
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#include <linux/sysrq.h>
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#include <linux/device.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_core.h>
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#include <linux/serial.h>
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#include <linux/amba/bus.h>
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#include <linux/amba/serial.h>
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#include <asm/io.h>
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#define UART_NR 2
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#define SERIAL_AMBA_MAJOR 204
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#define SERIAL_AMBA_MINOR 16
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#define SERIAL_AMBA_NR UART_NR
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#define AMBA_ISR_PASS_LIMIT 256
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#define UART_RX_DATA(s) (((s) & UART01x_FR_RXFE) == 0)
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#define UART_TX_READY(s) (((s) & UART01x_FR_TXFF) == 0)
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#define UART_DUMMY_RSR_RX 256
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#define UART_PORT_SIZE 64
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/*
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* We wrap our port structure around the generic uart_port.
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*/
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struct uart_amba_port {
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struct uart_port port;
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struct amba_device *dev;
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struct amba_pl010_data *data;
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unsigned int old_status;
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};
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static void pl010_stop_tx(struct uart_port *port)
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{
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unsigned int cr;
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cr = readb(port->membase + UART010_CR);
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cr &= ~UART010_CR_TIE;
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writel(cr, port->membase + UART010_CR);
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}
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static void pl010_start_tx(struct uart_port *port)
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{
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unsigned int cr;
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cr = readb(port->membase + UART010_CR);
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cr |= UART010_CR_TIE;
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writel(cr, port->membase + UART010_CR);
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}
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static void pl010_stop_rx(struct uart_port *port)
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{
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unsigned int cr;
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cr = readb(port->membase + UART010_CR);
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cr &= ~(UART010_CR_RIE | UART010_CR_RTIE);
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writel(cr, port->membase + UART010_CR);
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}
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static void pl010_enable_ms(struct uart_port *port)
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{
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unsigned int cr;
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cr = readb(port->membase + UART010_CR);
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cr |= UART010_CR_MSIE;
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writel(cr, port->membase + UART010_CR);
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}
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static void
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#ifdef SUPPORT_SYSRQ
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pl010_rx_chars(struct uart_port *port, struct pt_regs *regs)
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#else
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pl010_rx_chars(struct uart_port *port)
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#endif
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{
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struct tty_struct *tty = port->info->tty;
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unsigned int status, ch, flag, rsr, max_count = 256;
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status = readb(port->membase + UART01x_FR);
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while (UART_RX_DATA(status) && max_count--) {
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ch = readb(port->membase + UART01x_DR);
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flag = TTY_NORMAL;
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port->icount.rx++;
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/*
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* Note that the error handling code is
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* out of the main execution path
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*/
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rsr = readb(port->membase + UART01x_RSR) | UART_DUMMY_RSR_RX;
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if (unlikely(rsr & UART01x_RSR_ANY)) {
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if (rsr & UART01x_RSR_BE) {
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rsr &= ~(UART01x_RSR_FE | UART01x_RSR_PE);
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port->icount.brk++;
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if (uart_handle_break(port))
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goto ignore_char;
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} else if (rsr & UART01x_RSR_PE)
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port->icount.parity++;
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else if (rsr & UART01x_RSR_FE)
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port->icount.frame++;
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if (rsr & UART01x_RSR_OE)
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port->icount.overrun++;
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rsr &= port->read_status_mask;
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if (rsr & UART01x_RSR_BE)
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flag = TTY_BREAK;
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else if (rsr & UART01x_RSR_PE)
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flag = TTY_PARITY;
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else if (rsr & UART01x_RSR_FE)
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flag = TTY_FRAME;
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}
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if (uart_handle_sysrq_char(port, ch, regs))
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goto ignore_char;
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uart_insert_char(port, rsr, UART01x_RSR_OE, ch, flag);
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ignore_char:
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status = readb(port->membase + UART01x_FR);
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}
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tty_flip_buffer_push(tty);
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return;
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}
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static void pl010_tx_chars(struct uart_port *port)
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{
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struct circ_buf *xmit = &port->info->xmit;
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int count;
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if (port->x_char) {
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writel(port->x_char, port->membase + UART01x_DR);
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port->icount.tx++;
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port->x_char = 0;
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return;
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}
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if (uart_circ_empty(xmit) || uart_tx_stopped(port)) {
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pl010_stop_tx(port);
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return;
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}
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count = port->fifosize >> 1;
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do {
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writel(xmit->buf[xmit->tail], port->membase + UART01x_DR);
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xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
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port->icount.tx++;
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if (uart_circ_empty(xmit))
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break;
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} while (--count > 0);
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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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pl010_stop_tx(port);
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}
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static void pl010_modem_status(struct uart_port *port)
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{
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struct uart_amba_port *uap = (struct uart_amba_port *)port;
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unsigned int status, delta;
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writel(0, uap->port.membase + UART010_ICR);
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status = readb(uap->port.membase + UART01x_FR) & UART01x_FR_MODEM_ANY;
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delta = status ^ uap->old_status;
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uap->old_status = status;
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if (!delta)
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return;
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if (delta & UART01x_FR_DCD)
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uart_handle_dcd_change(&uap->port, status & UART01x_FR_DCD);
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if (delta & UART01x_FR_DSR)
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uap->port.icount.dsr++;
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if (delta & UART01x_FR_CTS)
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uart_handle_cts_change(&uap->port, status & UART01x_FR_CTS);
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wake_up_interruptible(&uap->port.info->delta_msr_wait);
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}
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static irqreturn_t pl010_int(int irq, void *dev_id, struct pt_regs *regs)
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{
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struct uart_port *port = dev_id;
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unsigned int status, pass_counter = AMBA_ISR_PASS_LIMIT;
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int handled = 0;
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spin_lock(&port->lock);
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status = readb(port->membase + UART010_IIR);
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if (status) {
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do {
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if (status & (UART010_IIR_RTIS | UART010_IIR_RIS))
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#ifdef SUPPORT_SYSRQ
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pl010_rx_chars(port, regs);
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#else
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pl010_rx_chars(port);
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#endif
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if (status & UART010_IIR_MIS)
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pl010_modem_status(port);
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if (status & UART010_IIR_TIS)
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pl010_tx_chars(port);
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if (pass_counter-- == 0)
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break;
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status = readb(port->membase + UART010_IIR);
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} while (status & (UART010_IIR_RTIS | UART010_IIR_RIS |
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UART010_IIR_TIS));
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handled = 1;
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}
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spin_unlock(&port->lock);
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return IRQ_RETVAL(handled);
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}
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static unsigned int pl010_tx_empty(struct uart_port *port)
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{
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return readb(port->membase + UART01x_FR) & UART01x_FR_BUSY ? 0 : TIOCSER_TEMT;
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}
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static unsigned int pl010_get_mctrl(struct uart_port *port)
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{
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unsigned int result = 0;
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unsigned int status;
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status = readb(port->membase + UART01x_FR);
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if (status & UART01x_FR_DCD)
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result |= TIOCM_CAR;
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if (status & UART01x_FR_DSR)
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result |= TIOCM_DSR;
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if (status & UART01x_FR_CTS)
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result |= TIOCM_CTS;
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return result;
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}
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static void pl010_set_mctrl(struct uart_port *port, unsigned int mctrl)
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{
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struct uart_amba_port *uap = (struct uart_amba_port *)port;
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if (uap->data)
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uap->data->set_mctrl(uap->dev, uap->port.membase, mctrl);
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}
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static void pl010_break_ctl(struct uart_port *port, int break_state)
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{
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unsigned long flags;
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unsigned int lcr_h;
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spin_lock_irqsave(&port->lock, flags);
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lcr_h = readb(port->membase + UART010_LCRH);
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if (break_state == -1)
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lcr_h |= UART01x_LCRH_BRK;
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else
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lcr_h &= ~UART01x_LCRH_BRK;
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writel(lcr_h, port->membase + UART010_LCRH);
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spin_unlock_irqrestore(&port->lock, flags);
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}
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static int pl010_startup(struct uart_port *port)
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{
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struct uart_amba_port *uap = (struct uart_amba_port *)port;
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int retval;
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/*
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* Allocate the IRQ
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*/
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retval = request_irq(port->irq, pl010_int, 0, "uart-pl010", port);
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if (retval)
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return retval;
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/*
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* initialise the old status of the modem signals
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*/
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uap->old_status = readb(port->membase + UART01x_FR) & UART01x_FR_MODEM_ANY;
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/*
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* Finally, enable interrupts
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*/
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writel(UART01x_CR_UARTEN | UART010_CR_RIE | UART010_CR_RTIE,
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port->membase + UART010_CR);
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return 0;
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}
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static void pl010_shutdown(struct uart_port *port)
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{
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/*
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* Free the interrupt
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*/
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free_irq(port->irq, port);
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/*
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* disable all interrupts, disable the port
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*/
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writel(0, port->membase + UART010_CR);
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/* disable break condition and fifos */
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writel(readb(port->membase + UART010_LCRH) &
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~(UART01x_LCRH_BRK | UART01x_LCRH_FEN),
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port->membase + UART010_LCRH);
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}
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static void
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pl010_set_termios(struct uart_port *port, struct termios *termios,
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struct termios *old)
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{
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unsigned int lcr_h, old_cr;
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unsigned long flags;
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unsigned int baud, quot;
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/*
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* Ask the core to calculate the divisor for us.
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*/
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baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
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quot = uart_get_divisor(port, baud);
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switch (termios->c_cflag & CSIZE) {
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case CS5:
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lcr_h = UART01x_LCRH_WLEN_5;
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break;
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case CS6:
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lcr_h = UART01x_LCRH_WLEN_6;
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break;
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case CS7:
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lcr_h = UART01x_LCRH_WLEN_7;
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break;
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default: // CS8
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lcr_h = UART01x_LCRH_WLEN_8;
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break;
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}
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if (termios->c_cflag & CSTOPB)
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lcr_h |= UART01x_LCRH_STP2;
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if (termios->c_cflag & PARENB) {
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lcr_h |= UART01x_LCRH_PEN;
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if (!(termios->c_cflag & PARODD))
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lcr_h |= UART01x_LCRH_EPS;
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}
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if (port->fifosize > 1)
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lcr_h |= UART01x_LCRH_FEN;
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spin_lock_irqsave(&port->lock, flags);
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/*
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* Update the per-port timeout.
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*/
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uart_update_timeout(port, termios->c_cflag, baud);
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port->read_status_mask = UART01x_RSR_OE;
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if (termios->c_iflag & INPCK)
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port->read_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
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if (termios->c_iflag & (BRKINT | PARMRK))
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port->read_status_mask |= UART01x_RSR_BE;
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/*
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* Characters to ignore
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*/
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port->ignore_status_mask = 0;
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if (termios->c_iflag & IGNPAR)
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port->ignore_status_mask |= UART01x_RSR_FE | UART01x_RSR_PE;
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if (termios->c_iflag & IGNBRK) {
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port->ignore_status_mask |= UART01x_RSR_BE;
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/*
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* If we're ignoring parity and break indicators,
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* ignore overruns too (for real raw support).
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*/
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if (termios->c_iflag & IGNPAR)
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port->ignore_status_mask |= UART01x_RSR_OE;
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}
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/*
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* Ignore all characters if CREAD is not set.
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*/
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if ((termios->c_cflag & CREAD) == 0)
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port->ignore_status_mask |= UART_DUMMY_RSR_RX;
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/* first, disable everything */
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old_cr = readb(port->membase + UART010_CR) & ~UART010_CR_MSIE;
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if (UART_ENABLE_MS(port, termios->c_cflag))
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old_cr |= UART010_CR_MSIE;
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writel(0, port->membase + UART010_CR);
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/* Set baud rate */
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quot -= 1;
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writel((quot & 0xf00) >> 8, port->membase + UART010_LCRM);
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writel(quot & 0xff, port->membase + UART010_LCRL);
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/*
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* ----------v----------v----------v----------v-----
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* NOTE: MUST BE WRITTEN AFTER UARTLCR_M & UARTLCR_L
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* ----------^----------^----------^----------^-----
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*/
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writel(lcr_h, port->membase + UART010_LCRH);
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writel(old_cr, port->membase + UART010_CR);
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spin_unlock_irqrestore(&port->lock, flags);
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}
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static const char *pl010_type(struct uart_port *port)
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{
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return port->type == PORT_AMBA ? "AMBA" : NULL;
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}
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/*
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* Release the memory region(s) being used by 'port'
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*/
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static void pl010_release_port(struct uart_port *port)
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{
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release_mem_region(port->mapbase, UART_PORT_SIZE);
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}
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/*
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* Request the memory region(s) being used by 'port'
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*/
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static int pl010_request_port(struct uart_port *port)
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{
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return request_mem_region(port->mapbase, UART_PORT_SIZE, "uart-pl010")
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!= NULL ? 0 : -EBUSY;
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}
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/*
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* Configure/autoconfigure the port.
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*/
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static void pl010_config_port(struct uart_port *port, int flags)
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{
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if (flags & UART_CONFIG_TYPE) {
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port->type = PORT_AMBA;
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pl010_request_port(port);
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}
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}
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/*
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* verify the new serial_struct (for TIOCSSERIAL).
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*/
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static int pl010_verify_port(struct uart_port *port, struct serial_struct *ser)
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{
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int ret = 0;
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if (ser->type != PORT_UNKNOWN && ser->type != PORT_AMBA)
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ret = -EINVAL;
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if (ser->irq < 0 || ser->irq >= NR_IRQS)
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ret = -EINVAL;
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if (ser->baud_base < 9600)
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ret = -EINVAL;
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return ret;
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}
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static struct uart_ops amba_pl010_pops = {
|
|
.tx_empty = pl010_tx_empty,
|
|
.set_mctrl = pl010_set_mctrl,
|
|
.get_mctrl = pl010_get_mctrl,
|
|
.stop_tx = pl010_stop_tx,
|
|
.start_tx = pl010_start_tx,
|
|
.stop_rx = pl010_stop_rx,
|
|
.enable_ms = pl010_enable_ms,
|
|
.break_ctl = pl010_break_ctl,
|
|
.startup = pl010_startup,
|
|
.shutdown = pl010_shutdown,
|
|
.set_termios = pl010_set_termios,
|
|
.type = pl010_type,
|
|
.release_port = pl010_release_port,
|
|
.request_port = pl010_request_port,
|
|
.config_port = pl010_config_port,
|
|
.verify_port = pl010_verify_port,
|
|
};
|
|
|
|
static struct uart_amba_port *amba_ports[UART_NR];
|
|
|
|
#ifdef CONFIG_SERIAL_AMBA_PL010_CONSOLE
|
|
|
|
static void pl010_console_putchar(struct uart_port *port, int ch)
|
|
{
|
|
unsigned int status;
|
|
|
|
do {
|
|
status = readb(port->membase + UART01x_FR);
|
|
barrier();
|
|
} while (!UART_TX_READY(status));
|
|
writel(ch, port->membase + UART01x_DR);
|
|
}
|
|
|
|
static void
|
|
pl010_console_write(struct console *co, const char *s, unsigned int count)
|
|
{
|
|
struct uart_port *port = &amba_ports[co->index]->port;
|
|
unsigned int status, old_cr;
|
|
|
|
/*
|
|
* First save the CR then disable the interrupts
|
|
*/
|
|
old_cr = readb(port->membase + UART010_CR);
|
|
writel(UART01x_CR_UARTEN, port->membase + UART010_CR);
|
|
|
|
uart_console_write(port, s, count, pl010_console_putchar);
|
|
|
|
/*
|
|
* Finally, wait for transmitter to become empty
|
|
* and restore the TCR
|
|
*/
|
|
do {
|
|
status = readb(port->membase + UART01x_FR);
|
|
barrier();
|
|
} while (status & UART01x_FR_BUSY);
|
|
writel(old_cr, port->membase + UART010_CR);
|
|
}
|
|
|
|
static void __init
|
|
pl010_console_get_options(struct uart_port *port, int *baud,
|
|
int *parity, int *bits)
|
|
{
|
|
if (readb(port->membase + UART010_CR) & UART01x_CR_UARTEN) {
|
|
unsigned int lcr_h, quot;
|
|
lcr_h = readb(port->membase + UART010_LCRH);
|
|
|
|
*parity = 'n';
|
|
if (lcr_h & UART01x_LCRH_PEN) {
|
|
if (lcr_h & UART01x_LCRH_EPS)
|
|
*parity = 'e';
|
|
else
|
|
*parity = 'o';
|
|
}
|
|
|
|
if ((lcr_h & 0x60) == UART01x_LCRH_WLEN_7)
|
|
*bits = 7;
|
|
else
|
|
*bits = 8;
|
|
|
|
quot = readb(port->membase + UART010_LCRL) | readb(port->membase + UART010_LCRM) << 8;
|
|
*baud = port->uartclk / (16 * (quot + 1));
|
|
}
|
|
}
|
|
|
|
static int __init pl010_console_setup(struct console *co, char *options)
|
|
{
|
|
struct uart_port *port;
|
|
int baud = 38400;
|
|
int bits = 8;
|
|
int parity = 'n';
|
|
int flow = 'n';
|
|
|
|
/*
|
|
* Check whether an invalid uart number has been specified, and
|
|
* if so, search for the first available port that does have
|
|
* console support.
|
|
*/
|
|
if (co->index >= UART_NR)
|
|
co->index = 0;
|
|
port = &amba_ports[co->index]->port;
|
|
|
|
if (options)
|
|
uart_parse_options(options, &baud, &parity, &bits, &flow);
|
|
else
|
|
pl010_console_get_options(port, &baud, &parity, &bits);
|
|
|
|
return uart_set_options(port, co, baud, parity, bits, flow);
|
|
}
|
|
|
|
static struct uart_driver amba_reg;
|
|
static struct console amba_console = {
|
|
.name = "ttyAM",
|
|
.write = pl010_console_write,
|
|
.device = uart_console_device,
|
|
.setup = pl010_console_setup,
|
|
.flags = CON_PRINTBUFFER,
|
|
.index = -1,
|
|
.data = &amba_reg,
|
|
};
|
|
|
|
#define AMBA_CONSOLE &amba_console
|
|
#else
|
|
#define AMBA_CONSOLE NULL
|
|
#endif
|
|
|
|
static struct uart_driver amba_reg = {
|
|
.owner = THIS_MODULE,
|
|
.driver_name = "ttyAM",
|
|
.dev_name = "ttyAM",
|
|
.major = SERIAL_AMBA_MAJOR,
|
|
.minor = SERIAL_AMBA_MINOR,
|
|
.nr = UART_NR,
|
|
.cons = AMBA_CONSOLE,
|
|
};
|
|
|
|
static int pl010_probe(struct amba_device *dev, void *id)
|
|
{
|
|
struct uart_amba_port *port;
|
|
void __iomem *base;
|
|
int i, ret;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(amba_ports); i++)
|
|
if (amba_ports[i] == NULL)
|
|
break;
|
|
|
|
if (i == ARRAY_SIZE(amba_ports)) {
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
port = kzalloc(sizeof(struct uart_amba_port), GFP_KERNEL);
|
|
if (!port) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
base = ioremap(dev->res.start, PAGE_SIZE);
|
|
if (!base) {
|
|
ret = -ENOMEM;
|
|
goto free;
|
|
}
|
|
|
|
port->port.dev = &dev->dev;
|
|
port->port.mapbase = dev->res.start;
|
|
port->port.membase = base;
|
|
port->port.iotype = UPIO_MEM;
|
|
port->port.irq = dev->irq[0];
|
|
port->port.uartclk = 14745600;
|
|
port->port.fifosize = 16;
|
|
port->port.ops = &amba_pl010_pops;
|
|
port->port.flags = UPF_BOOT_AUTOCONF;
|
|
port->port.line = i;
|
|
port->dev = dev;
|
|
port->data = dev->dev.platform_data;
|
|
|
|
amba_ports[i] = port;
|
|
|
|
amba_set_drvdata(dev, port);
|
|
ret = uart_add_one_port(&amba_reg, &port->port);
|
|
if (ret) {
|
|
amba_set_drvdata(dev, NULL);
|
|
amba_ports[i] = NULL;
|
|
iounmap(base);
|
|
free:
|
|
kfree(port);
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static int pl010_remove(struct amba_device *dev)
|
|
{
|
|
struct uart_amba_port *port = amba_get_drvdata(dev);
|
|
int i;
|
|
|
|
amba_set_drvdata(dev, NULL);
|
|
|
|
uart_remove_one_port(&amba_reg, &port->port);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(amba_ports); i++)
|
|
if (amba_ports[i] == port)
|
|
amba_ports[i] = NULL;
|
|
|
|
iounmap(port->port.membase);
|
|
kfree(port);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pl010_suspend(struct amba_device *dev, pm_message_t state)
|
|
{
|
|
struct uart_amba_port *uap = amba_get_drvdata(dev);
|
|
|
|
if (uap)
|
|
uart_suspend_port(&amba_reg, &uap->port);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pl010_resume(struct amba_device *dev)
|
|
{
|
|
struct uart_amba_port *uap = amba_get_drvdata(dev);
|
|
|
|
if (uap)
|
|
uart_resume_port(&amba_reg, &uap->port);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct amba_id pl010_ids[] __initdata = {
|
|
{
|
|
.id = 0x00041010,
|
|
.mask = 0x000fffff,
|
|
},
|
|
{ 0, 0 },
|
|
};
|
|
|
|
static struct amba_driver pl010_driver = {
|
|
.drv = {
|
|
.name = "uart-pl010",
|
|
},
|
|
.id_table = pl010_ids,
|
|
.probe = pl010_probe,
|
|
.remove = pl010_remove,
|
|
.suspend = pl010_suspend,
|
|
.resume = pl010_resume,
|
|
};
|
|
|
|
static int __init pl010_init(void)
|
|
{
|
|
int ret;
|
|
|
|
printk(KERN_INFO "Serial: AMBA driver $Revision: 1.41 $\n");
|
|
|
|
ret = uart_register_driver(&amba_reg);
|
|
if (ret == 0) {
|
|
ret = amba_driver_register(&pl010_driver);
|
|
if (ret)
|
|
uart_unregister_driver(&amba_reg);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void __exit pl010_exit(void)
|
|
{
|
|
amba_driver_unregister(&pl010_driver);
|
|
uart_unregister_driver(&amba_reg);
|
|
}
|
|
|
|
module_init(pl010_init);
|
|
module_exit(pl010_exit);
|
|
|
|
MODULE_AUTHOR("ARM Ltd/Deep Blue Solutions Ltd");
|
|
MODULE_DESCRIPTION("ARM AMBA serial port driver $Revision: 1.41 $");
|
|
MODULE_LICENSE("GPL");
|