759 строки
17 KiB
C
759 строки
17 KiB
C
/*
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* drivers/serial/msm_serial.c - driver for msm7k serial device and console
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*
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* Copyright (C) 2007 Google, Inc.
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* Author: Robert Love <rlove@google.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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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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#if defined(CONFIG_SERIAL_MSM_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
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# define SUPPORT_SYSRQ
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#endif
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#include <linux/hrtimer.h>
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#include <linux/module.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <linux/irq.h>
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#include <linux/init.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_core.h>
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#include <linux/serial.h>
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#include <linux/clk.h>
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#include <linux/platform_device.h>
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#include "msm_serial.h"
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struct msm_port {
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struct uart_port uart;
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char name[16];
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struct clk *clk;
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unsigned int imr;
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};
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static void msm_stop_tx(struct uart_port *port)
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{
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struct msm_port *msm_port = UART_TO_MSM(port);
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msm_port->imr &= ~UART_IMR_TXLEV;
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msm_write(port, msm_port->imr, UART_IMR);
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}
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static void msm_start_tx(struct uart_port *port)
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{
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struct msm_port *msm_port = UART_TO_MSM(port);
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msm_port->imr |= UART_IMR_TXLEV;
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msm_write(port, msm_port->imr, UART_IMR);
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}
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static void msm_stop_rx(struct uart_port *port)
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{
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struct msm_port *msm_port = UART_TO_MSM(port);
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msm_port->imr &= ~(UART_IMR_RXLEV | UART_IMR_RXSTALE);
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msm_write(port, msm_port->imr, UART_IMR);
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}
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static void msm_enable_ms(struct uart_port *port)
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{
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struct msm_port *msm_port = UART_TO_MSM(port);
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msm_port->imr |= UART_IMR_DELTA_CTS;
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msm_write(port, msm_port->imr, UART_IMR);
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}
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static void handle_rx(struct uart_port *port)
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{
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struct tty_struct *tty = port->state->port.tty;
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unsigned int sr;
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/*
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* Handle overrun. My understanding of the hardware is that overrun
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* is not tied to the RX buffer, so we handle the case out of band.
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*/
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if ((msm_read(port, UART_SR) & UART_SR_OVERRUN)) {
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port->icount.overrun++;
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tty_insert_flip_char(tty, 0, TTY_OVERRUN);
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msm_write(port, UART_CR_CMD_RESET_ERR, UART_CR);
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}
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/* and now the main RX loop */
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while ((sr = msm_read(port, UART_SR)) & UART_SR_RX_READY) {
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unsigned int c;
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char flag = TTY_NORMAL;
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c = msm_read(port, UART_RF);
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if (sr & UART_SR_RX_BREAK) {
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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 (sr & UART_SR_PAR_FRAME_ERR) {
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port->icount.frame++;
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} else {
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port->icount.rx++;
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}
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/* Mask conditions we're ignorning. */
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sr &= port->read_status_mask;
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if (sr & UART_SR_RX_BREAK) {
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flag = TTY_BREAK;
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} else if (sr & UART_SR_PAR_FRAME_ERR) {
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flag = TTY_FRAME;
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}
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if (!uart_handle_sysrq_char(port, c))
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tty_insert_flip_char(tty, c, flag);
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}
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tty_flip_buffer_push(tty);
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}
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static void handle_tx(struct uart_port *port)
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{
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struct circ_buf *xmit = &port->state->xmit;
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struct msm_port *msm_port = UART_TO_MSM(port);
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int sent_tx;
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if (port->x_char) {
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msm_write(port, port->x_char, UART_TF);
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port->icount.tx++;
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port->x_char = 0;
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}
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while (msm_read(port, UART_SR) & UART_SR_TX_READY) {
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if (uart_circ_empty(xmit)) {
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/* disable tx interrupts */
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msm_port->imr &= ~UART_IMR_TXLEV;
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msm_write(port, msm_port->imr, UART_IMR);
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break;
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}
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msm_write(port, xmit->buf[xmit->tail], UART_TF);
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xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
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port->icount.tx++;
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sent_tx = 1;
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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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}
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static void handle_delta_cts(struct uart_port *port)
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{
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msm_write(port, UART_CR_CMD_RESET_CTS, UART_CR);
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port->icount.cts++;
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wake_up_interruptible(&port->state->port.delta_msr_wait);
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}
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static irqreturn_t msm_irq(int irq, void *dev_id)
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{
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struct uart_port *port = dev_id;
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struct msm_port *msm_port = UART_TO_MSM(port);
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unsigned int misr;
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spin_lock(&port->lock);
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misr = msm_read(port, UART_MISR);
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msm_write(port, 0, UART_IMR); /* disable interrupt */
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if (misr & (UART_IMR_RXLEV | UART_IMR_RXSTALE))
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handle_rx(port);
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if (misr & UART_IMR_TXLEV)
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handle_tx(port);
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if (misr & UART_IMR_DELTA_CTS)
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handle_delta_cts(port);
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msm_write(port, msm_port->imr, UART_IMR); /* restore interrupt */
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spin_unlock(&port->lock);
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return IRQ_HANDLED;
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}
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static unsigned int msm_tx_empty(struct uart_port *port)
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{
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return (msm_read(port, UART_SR) & UART_SR_TX_EMPTY) ? TIOCSER_TEMT : 0;
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}
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static unsigned int msm_get_mctrl(struct uart_port *port)
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{
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return TIOCM_CAR | TIOCM_CTS | TIOCM_DSR | TIOCM_RTS;
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}
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static void msm_set_mctrl(struct uart_port *port, unsigned int mctrl)
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{
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unsigned int mr;
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mr = msm_read(port, UART_MR1);
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if (!(mctrl & TIOCM_RTS)) {
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mr &= ~UART_MR1_RX_RDY_CTL;
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msm_write(port, mr, UART_MR1);
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msm_write(port, UART_CR_CMD_RESET_RFR, UART_CR);
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} else {
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mr |= UART_MR1_RX_RDY_CTL;
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msm_write(port, mr, UART_MR1);
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}
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}
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static void msm_break_ctl(struct uart_port *port, int break_ctl)
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{
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if (break_ctl)
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msm_write(port, UART_CR_CMD_START_BREAK, UART_CR);
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else
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msm_write(port, UART_CR_CMD_STOP_BREAK, UART_CR);
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}
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static int msm_set_baud_rate(struct uart_port *port, unsigned int baud)
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{
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unsigned int baud_code, rxstale, watermark;
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switch (baud) {
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case 300:
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baud_code = UART_CSR_300;
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rxstale = 1;
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break;
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case 600:
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baud_code = UART_CSR_600;
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rxstale = 1;
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break;
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case 1200:
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baud_code = UART_CSR_1200;
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rxstale = 1;
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break;
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case 2400:
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baud_code = UART_CSR_2400;
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rxstale = 1;
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break;
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case 4800:
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baud_code = UART_CSR_4800;
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rxstale = 1;
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break;
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case 9600:
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baud_code = UART_CSR_9600;
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rxstale = 2;
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break;
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case 14400:
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baud_code = UART_CSR_14400;
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rxstale = 3;
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break;
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case 19200:
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baud_code = UART_CSR_19200;
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rxstale = 4;
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break;
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case 28800:
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baud_code = UART_CSR_28800;
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rxstale = 6;
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break;
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case 38400:
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baud_code = UART_CSR_38400;
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rxstale = 8;
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break;
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case 57600:
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baud_code = UART_CSR_57600;
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rxstale = 16;
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break;
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case 115200:
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default:
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baud_code = UART_CSR_115200;
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baud = 115200;
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rxstale = 31;
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break;
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}
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msm_write(port, baud_code, UART_CSR);
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/* RX stale watermark */
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watermark = UART_IPR_STALE_LSB & rxstale;
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watermark |= UART_IPR_RXSTALE_LAST;
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watermark |= UART_IPR_STALE_TIMEOUT_MSB & (rxstale << 2);
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msm_write(port, watermark, UART_IPR);
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/* set RX watermark */
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watermark = (port->fifosize * 3) / 4;
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msm_write(port, watermark, UART_RFWR);
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/* set TX watermark */
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msm_write(port, 10, UART_TFWR);
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return baud;
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}
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static void msm_reset(struct uart_port *port)
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{
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/* reset everything */
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msm_write(port, UART_CR_CMD_RESET_RX, UART_CR);
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msm_write(port, UART_CR_CMD_RESET_TX, UART_CR);
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msm_write(port, UART_CR_CMD_RESET_ERR, UART_CR);
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msm_write(port, UART_CR_CMD_RESET_BREAK_INT, UART_CR);
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msm_write(port, UART_CR_CMD_RESET_CTS, UART_CR);
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msm_write(port, UART_CR_CMD_SET_RFR, UART_CR);
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}
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static void msm_init_clock(struct uart_port *port)
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{
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struct msm_port *msm_port = UART_TO_MSM(port);
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clk_enable(msm_port->clk);
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msm_serial_set_mnd_regs(port);
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}
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static int msm_startup(struct uart_port *port)
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{
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struct msm_port *msm_port = UART_TO_MSM(port);
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unsigned int data, rfr_level;
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int ret;
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snprintf(msm_port->name, sizeof(msm_port->name),
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"msm_serial%d", port->line);
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ret = request_irq(port->irq, msm_irq, IRQF_TRIGGER_HIGH,
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msm_port->name, port);
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if (unlikely(ret))
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return ret;
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msm_init_clock(port);
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if (likely(port->fifosize > 12))
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rfr_level = port->fifosize - 12;
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else
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rfr_level = port->fifosize;
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/* set automatic RFR level */
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data = msm_read(port, UART_MR1);
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data &= ~UART_MR1_AUTO_RFR_LEVEL1;
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data &= ~UART_MR1_AUTO_RFR_LEVEL0;
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data |= UART_MR1_AUTO_RFR_LEVEL1 & (rfr_level << 2);
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data |= UART_MR1_AUTO_RFR_LEVEL0 & rfr_level;
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msm_write(port, data, UART_MR1);
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/* make sure that RXSTALE count is non-zero */
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data = msm_read(port, UART_IPR);
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if (unlikely(!data)) {
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data |= UART_IPR_RXSTALE_LAST;
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data |= UART_IPR_STALE_LSB;
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msm_write(port, data, UART_IPR);
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}
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msm_reset(port);
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msm_write(port, 0x05, UART_CR); /* enable TX & RX */
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/* turn on RX and CTS interrupts */
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msm_port->imr = UART_IMR_RXLEV | UART_IMR_RXSTALE |
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UART_IMR_CURRENT_CTS;
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msm_write(port, msm_port->imr, UART_IMR);
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return 0;
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}
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static void msm_shutdown(struct uart_port *port)
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{
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struct msm_port *msm_port = UART_TO_MSM(port);
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msm_port->imr = 0;
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msm_write(port, 0, UART_IMR); /* disable interrupts */
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clk_disable(msm_port->clk);
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free_irq(port->irq, port);
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}
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static void msm_set_termios(struct uart_port *port, struct ktermios *termios,
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struct ktermios *old)
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{
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unsigned long flags;
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unsigned int baud, mr;
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spin_lock_irqsave(&port->lock, flags);
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/* calculate and set baud rate */
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baud = uart_get_baud_rate(port, termios, old, 300, 115200);
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baud = msm_set_baud_rate(port, baud);
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if (tty_termios_baud_rate(termios))
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tty_termios_encode_baud_rate(termios, baud, baud);
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/* calculate parity */
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mr = msm_read(port, UART_MR2);
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mr &= ~UART_MR2_PARITY_MODE;
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if (termios->c_cflag & PARENB) {
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if (termios->c_cflag & PARODD)
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mr |= UART_MR2_PARITY_MODE_ODD;
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else if (termios->c_cflag & CMSPAR)
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mr |= UART_MR2_PARITY_MODE_SPACE;
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else
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mr |= UART_MR2_PARITY_MODE_EVEN;
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}
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/* calculate bits per char */
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mr &= ~UART_MR2_BITS_PER_CHAR;
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switch (termios->c_cflag & CSIZE) {
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case CS5:
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mr |= UART_MR2_BITS_PER_CHAR_5;
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break;
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case CS6:
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mr |= UART_MR2_BITS_PER_CHAR_6;
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break;
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case CS7:
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mr |= UART_MR2_BITS_PER_CHAR_7;
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break;
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case CS8:
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default:
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mr |= UART_MR2_BITS_PER_CHAR_8;
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break;
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}
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/* calculate stop bits */
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mr &= ~(UART_MR2_STOP_BIT_LEN_ONE | UART_MR2_STOP_BIT_LEN_TWO);
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if (termios->c_cflag & CSTOPB)
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mr |= UART_MR2_STOP_BIT_LEN_TWO;
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else
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mr |= UART_MR2_STOP_BIT_LEN_ONE;
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/* set parity, bits per char, and stop bit */
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msm_write(port, mr, UART_MR2);
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/* calculate and set hardware flow control */
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mr = msm_read(port, UART_MR1);
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mr &= ~(UART_MR1_CTS_CTL | UART_MR1_RX_RDY_CTL);
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if (termios->c_cflag & CRTSCTS) {
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mr |= UART_MR1_CTS_CTL;
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mr |= UART_MR1_RX_RDY_CTL;
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}
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msm_write(port, mr, UART_MR1);
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/* Configure status bits to ignore based on termio flags. */
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port->read_status_mask = 0;
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if (termios->c_iflag & INPCK)
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port->read_status_mask |= UART_SR_PAR_FRAME_ERR;
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if (termios->c_iflag & (BRKINT | PARMRK))
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port->read_status_mask |= UART_SR_RX_BREAK;
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uart_update_timeout(port, termios->c_cflag, baud);
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spin_unlock_irqrestore(&port->lock, flags);
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}
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static const char *msm_type(struct uart_port *port)
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{
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return "MSM";
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}
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static void msm_release_port(struct uart_port *port)
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{
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struct platform_device *pdev = to_platform_device(port->dev);
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struct resource *resource;
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resource_size_t size;
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resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (unlikely(!resource))
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return;
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size = resource->end - resource->start + 1;
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release_mem_region(port->mapbase, size);
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iounmap(port->membase);
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port->membase = NULL;
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}
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static int msm_request_port(struct uart_port *port)
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{
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struct platform_device *pdev = to_platform_device(port->dev);
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struct resource *resource;
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resource_size_t size;
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resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (unlikely(!resource))
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return -ENXIO;
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size = resource->end - resource->start + 1;
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if (unlikely(!request_mem_region(port->mapbase, size, "msm_serial")))
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return -EBUSY;
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port->membase = ioremap(port->mapbase, size);
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if (!port->membase) {
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release_mem_region(port->mapbase, size);
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return -EBUSY;
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}
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return 0;
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}
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static void msm_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_MSM;
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msm_request_port(port);
|
|
}
|
|
}
|
|
|
|
static int msm_verify_port(struct uart_port *port, struct serial_struct *ser)
|
|
{
|
|
if (unlikely(ser->type != PORT_UNKNOWN && ser->type != PORT_MSM))
|
|
return -EINVAL;
|
|
if (unlikely(port->irq != ser->irq))
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
|
|
static void msm_power(struct uart_port *port, unsigned int state,
|
|
unsigned int oldstate)
|
|
{
|
|
struct msm_port *msm_port = UART_TO_MSM(port);
|
|
|
|
switch (state) {
|
|
case 0:
|
|
clk_enable(msm_port->clk);
|
|
break;
|
|
case 3:
|
|
clk_disable(msm_port->clk);
|
|
break;
|
|
default:
|
|
printk(KERN_ERR "msm_serial: Unknown PM state %d\n", state);
|
|
}
|
|
}
|
|
|
|
static struct uart_ops msm_uart_pops = {
|
|
.tx_empty = msm_tx_empty,
|
|
.set_mctrl = msm_set_mctrl,
|
|
.get_mctrl = msm_get_mctrl,
|
|
.stop_tx = msm_stop_tx,
|
|
.start_tx = msm_start_tx,
|
|
.stop_rx = msm_stop_rx,
|
|
.enable_ms = msm_enable_ms,
|
|
.break_ctl = msm_break_ctl,
|
|
.startup = msm_startup,
|
|
.shutdown = msm_shutdown,
|
|
.set_termios = msm_set_termios,
|
|
.type = msm_type,
|
|
.release_port = msm_release_port,
|
|
.request_port = msm_request_port,
|
|
.config_port = msm_config_port,
|
|
.verify_port = msm_verify_port,
|
|
.pm = msm_power,
|
|
};
|
|
|
|
static struct msm_port msm_uart_ports[] = {
|
|
{
|
|
.uart = {
|
|
.iotype = UPIO_MEM,
|
|
.ops = &msm_uart_pops,
|
|
.flags = UPF_BOOT_AUTOCONF,
|
|
.fifosize = 512,
|
|
.line = 0,
|
|
},
|
|
},
|
|
{
|
|
.uart = {
|
|
.iotype = UPIO_MEM,
|
|
.ops = &msm_uart_pops,
|
|
.flags = UPF_BOOT_AUTOCONF,
|
|
.fifosize = 512,
|
|
.line = 1,
|
|
},
|
|
},
|
|
{
|
|
.uart = {
|
|
.iotype = UPIO_MEM,
|
|
.ops = &msm_uart_pops,
|
|
.flags = UPF_BOOT_AUTOCONF,
|
|
.fifosize = 64,
|
|
.line = 2,
|
|
},
|
|
},
|
|
};
|
|
|
|
#define UART_NR ARRAY_SIZE(msm_uart_ports)
|
|
|
|
static inline struct uart_port *get_port_from_line(unsigned int line)
|
|
{
|
|
return &msm_uart_ports[line].uart;
|
|
}
|
|
|
|
#ifdef CONFIG_SERIAL_MSM_CONSOLE
|
|
|
|
static void msm_console_putchar(struct uart_port *port, int c)
|
|
{
|
|
while (!(msm_read(port, UART_SR) & UART_SR_TX_READY))
|
|
;
|
|
msm_write(port, c, UART_TF);
|
|
}
|
|
|
|
static void msm_console_write(struct console *co, const char *s,
|
|
unsigned int count)
|
|
{
|
|
struct uart_port *port;
|
|
struct msm_port *msm_port;
|
|
|
|
BUG_ON(co->index < 0 || co->index >= UART_NR);
|
|
|
|
port = get_port_from_line(co->index);
|
|
msm_port = UART_TO_MSM(port);
|
|
|
|
spin_lock(&port->lock);
|
|
uart_console_write(port, s, count, msm_console_putchar);
|
|
spin_unlock(&port->lock);
|
|
}
|
|
|
|
static int __init msm_console_setup(struct console *co, char *options)
|
|
{
|
|
struct uart_port *port;
|
|
int baud, flow, bits, parity;
|
|
|
|
if (unlikely(co->index >= UART_NR || co->index < 0))
|
|
return -ENXIO;
|
|
|
|
port = get_port_from_line(co->index);
|
|
|
|
if (unlikely(!port->membase))
|
|
return -ENXIO;
|
|
|
|
port->cons = co;
|
|
|
|
msm_init_clock(port);
|
|
|
|
if (options)
|
|
uart_parse_options(options, &baud, &parity, &bits, &flow);
|
|
|
|
bits = 8;
|
|
parity = 'n';
|
|
flow = 'n';
|
|
msm_write(port, UART_MR2_BITS_PER_CHAR_8 | UART_MR2_STOP_BIT_LEN_ONE,
|
|
UART_MR2); /* 8N1 */
|
|
|
|
if (baud < 300 || baud > 115200)
|
|
baud = 115200;
|
|
msm_set_baud_rate(port, baud);
|
|
|
|
msm_reset(port);
|
|
|
|
printk(KERN_INFO "msm_serial: console setup on port #%d\n", port->line);
|
|
|
|
return uart_set_options(port, co, baud, parity, bits, flow);
|
|
}
|
|
|
|
static struct uart_driver msm_uart_driver;
|
|
|
|
static struct console msm_console = {
|
|
.name = "ttyMSM",
|
|
.write = msm_console_write,
|
|
.device = uart_console_device,
|
|
.setup = msm_console_setup,
|
|
.flags = CON_PRINTBUFFER,
|
|
.index = -1,
|
|
.data = &msm_uart_driver,
|
|
};
|
|
|
|
#define MSM_CONSOLE (&msm_console)
|
|
|
|
#else
|
|
#define MSM_CONSOLE NULL
|
|
#endif
|
|
|
|
static struct uart_driver msm_uart_driver = {
|
|
.owner = THIS_MODULE,
|
|
.driver_name = "msm_serial",
|
|
.dev_name = "ttyMSM",
|
|
.nr = UART_NR,
|
|
.cons = MSM_CONSOLE,
|
|
};
|
|
|
|
static int __init msm_serial_probe(struct platform_device *pdev)
|
|
{
|
|
struct msm_port *msm_port;
|
|
struct resource *resource;
|
|
struct uart_port *port;
|
|
int irq;
|
|
|
|
if (unlikely(pdev->id < 0 || pdev->id >= UART_NR))
|
|
return -ENXIO;
|
|
|
|
printk(KERN_INFO "msm_serial: detected port #%d\n", pdev->id);
|
|
|
|
port = get_port_from_line(pdev->id);
|
|
port->dev = &pdev->dev;
|
|
msm_port = UART_TO_MSM(port);
|
|
|
|
msm_port->clk = clk_get(&pdev->dev, "uart_clk");
|
|
if (IS_ERR(msm_port->clk))
|
|
return PTR_ERR(msm_port->clk);
|
|
port->uartclk = clk_get_rate(msm_port->clk);
|
|
printk(KERN_INFO "uartclk = %d\n", port->uartclk);
|
|
|
|
|
|
resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (unlikely(!resource))
|
|
return -ENXIO;
|
|
port->mapbase = resource->start;
|
|
|
|
irq = platform_get_irq(pdev, 0);
|
|
if (unlikely(irq < 0))
|
|
return -ENXIO;
|
|
port->irq = irq;
|
|
|
|
platform_set_drvdata(pdev, port);
|
|
|
|
return uart_add_one_port(&msm_uart_driver, port);
|
|
}
|
|
|
|
static int __devexit msm_serial_remove(struct platform_device *pdev)
|
|
{
|
|
struct msm_port *msm_port = platform_get_drvdata(pdev);
|
|
|
|
clk_put(msm_port->clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct platform_driver msm_platform_driver = {
|
|
.remove = msm_serial_remove,
|
|
.driver = {
|
|
.name = "msm_serial",
|
|
.owner = THIS_MODULE,
|
|
},
|
|
};
|
|
|
|
static int __init msm_serial_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = uart_register_driver(&msm_uart_driver);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
|
|
ret = platform_driver_probe(&msm_platform_driver, msm_serial_probe);
|
|
if (unlikely(ret))
|
|
uart_unregister_driver(&msm_uart_driver);
|
|
|
|
printk(KERN_INFO "msm_serial: driver initialized\n");
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void __exit msm_serial_exit(void)
|
|
{
|
|
#ifdef CONFIG_SERIAL_MSM_CONSOLE
|
|
unregister_console(&msm_console);
|
|
#endif
|
|
platform_driver_unregister(&msm_platform_driver);
|
|
uart_unregister_driver(&msm_uart_driver);
|
|
}
|
|
|
|
module_init(msm_serial_init);
|
|
module_exit(msm_serial_exit);
|
|
|
|
MODULE_AUTHOR("Robert Love <rlove@google.com>");
|
|
MODULE_DESCRIPTION("Driver for msm7x serial device");
|
|
MODULE_LICENSE("GPL");
|