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![Andy Gross](/assets/img/avatar_default.png)
This patch removes direct access of the GSBI registers. GSBI configuration should be done through the GSBI driver directly. Signed-off-by: Andy Gross <agross@codeaurora.org> Signed-off-by: Kumar Gala <galak@codeaurora.org>
1107 lines
26 KiB
C
1107 lines
26 KiB
C
/*
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* 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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* Copyright (c) 2011, Code Aurora Forum. All rights reserved.
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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/atomic.h>
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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 <linux/delay.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include "msm_serial.h"
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enum {
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UARTDM_1P1 = 1,
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UARTDM_1P2,
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UARTDM_1P3,
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UARTDM_1P4,
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};
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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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struct clk *pclk;
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unsigned int imr;
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int is_uartdm;
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unsigned int old_snap_state;
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};
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static inline void wait_for_xmitr(struct uart_port *port)
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{
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while (!(msm_read(port, UART_SR) & UART_SR_TX_EMPTY)) {
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if (msm_read(port, UART_ISR) & UART_ISR_TX_READY)
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break;
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udelay(1);
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}
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msm_write(port, UART_CR_CMD_RESET_TX_READY, UART_CR);
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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_dm(struct uart_port *port, unsigned int misr)
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{
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struct tty_port *tport = &port->state->port;
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unsigned int sr;
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int count = 0;
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struct msm_port *msm_port = UART_TO_MSM(port);
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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(tport, 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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if (misr & UART_IMR_RXSTALE) {
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count = msm_read(port, UARTDM_RX_TOTAL_SNAP) -
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msm_port->old_snap_state;
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msm_port->old_snap_state = 0;
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} else {
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count = 4 * (msm_read(port, UART_RFWR));
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msm_port->old_snap_state += count;
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}
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/* TODO: Precise error reporting */
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port->icount.rx += count;
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while (count > 0) {
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unsigned int c;
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sr = msm_read(port, UART_SR);
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if ((sr & UART_SR_RX_READY) == 0) {
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msm_port->old_snap_state -= count;
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break;
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}
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c = msm_read(port, UARTDM_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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/* TODO: handle sysrq */
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tty_insert_flip_string(tport, (char *)&c,
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(count > 4) ? 4 : count);
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count -= 4;
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}
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spin_unlock(&port->lock);
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tty_flip_buffer_push(tport);
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spin_lock(&port->lock);
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if (misr & (UART_IMR_RXSTALE))
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msm_write(port, UART_CR_CMD_RESET_STALE_INT, UART_CR);
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msm_write(port, 0xFFFFFF, UARTDM_DMRX);
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msm_write(port, UART_CR_CMD_STALE_EVENT_ENABLE, UART_CR);
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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_port *tport = &port->state->port;
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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(tport, 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(tport, c, flag);
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}
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spin_unlock(&port->lock);
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tty_flip_buffer_push(tport);
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spin_lock(&port->lock);
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}
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static void reset_dm_count(struct uart_port *port, int count)
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{
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wait_for_xmitr(port);
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msm_write(port, count, UARTDM_NCF_TX);
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msm_read(port, UARTDM_NCF_TX);
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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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unsigned int tx_count, num_chars;
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unsigned int tf_pointer = 0;
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tx_count = uart_circ_chars_pending(xmit);
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tx_count = min3(tx_count, (unsigned int)UART_XMIT_SIZE - xmit->tail,
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port->fifosize);
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if (port->x_char) {
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if (msm_port->is_uartdm)
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reset_dm_count(port, tx_count + 1);
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msm_write(port, port->x_char,
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msm_port->is_uartdm ? UARTDM_TF : UART_TF);
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port->icount.tx++;
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port->x_char = 0;
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} else if (tx_count && msm_port->is_uartdm) {
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reset_dm_count(port, tx_count);
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}
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while (tf_pointer < tx_count) {
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int i;
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char buf[4] = { 0 };
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unsigned int *bf = (unsigned int *)&buf;
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if (!(msm_read(port, UART_SR) & UART_SR_TX_READY))
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break;
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if (msm_port->is_uartdm)
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num_chars = min(tx_count - tf_pointer,
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(unsigned int)sizeof(buf));
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else
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num_chars = 1;
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for (i = 0; i < num_chars; i++) {
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buf[i] = xmit->buf[xmit->tail + i];
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port->icount.tx++;
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}
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msm_write(port, *bf, msm_port->is_uartdm ? UARTDM_TF : UART_TF);
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xmit->tail = (xmit->tail + num_chars) & (UART_XMIT_SIZE - 1);
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tf_pointer += num_chars;
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}
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/* disable tx interrupts if nothing more to send */
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if (uart_circ_empty(xmit))
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msm_stop_tx(port);
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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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if (msm_port->is_uartdm)
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handle_rx_dm(port, misr);
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else
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handle_rx(port);
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}
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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_reset(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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/* 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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/* Disable DM modes */
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if (msm_port->is_uartdm)
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msm_write(port, 0, UARTDM_DMEN);
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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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struct msm_baud_map {
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u16 divisor;
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u8 code;
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u8 rxstale;
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};
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static const struct msm_baud_map *
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msm_find_best_baud(struct uart_port *port, unsigned int baud)
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{
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unsigned int i, divisor;
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const struct msm_baud_map *entry;
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static const struct msm_baud_map table[] = {
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{ 1536, 0x00, 1 },
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{ 768, 0x11, 1 },
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{ 384, 0x22, 1 },
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{ 192, 0x33, 1 },
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{ 96, 0x44, 1 },
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{ 48, 0x55, 1 },
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{ 32, 0x66, 1 },
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{ 24, 0x77, 1 },
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{ 16, 0x88, 1 },
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{ 12, 0x99, 6 },
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{ 8, 0xaa, 6 },
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{ 6, 0xbb, 6 },
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{ 4, 0xcc, 6 },
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{ 3, 0xdd, 8 },
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{ 2, 0xee, 16 },
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{ 1, 0xff, 31 },
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};
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divisor = uart_get_divisor(port, baud);
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for (i = 0, entry = table; i < ARRAY_SIZE(table); i++, entry++)
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if (entry->divisor <= divisor)
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break;
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return entry; /* Default to smallest divider */
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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 rxstale, watermark;
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struct msm_port *msm_port = UART_TO_MSM(port);
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const struct msm_baud_map *entry;
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entry = msm_find_best_baud(port, baud);
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if (msm_port->is_uartdm)
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msm_write(port, UART_CR_CMD_RESET_RX, UART_CR);
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msm_write(port, entry->code, UART_CSR);
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/* RX stale watermark */
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rxstale = entry->rxstale;
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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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if (msm_port->is_uartdm) {
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msm_write(port, UART_CR_CMD_RESET_STALE_INT, UART_CR);
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msm_write(port, 0xFFFFFF, UARTDM_DMRX);
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msm_write(port, UART_CR_CMD_STALE_EVENT_ENABLE, UART_CR);
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}
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return baud;
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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_prepare_enable(msm_port->clk);
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clk_prepare_enable(msm_port->pclk);
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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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|
|
|
data = 0;
|
|
if (!port->cons || (port->cons && !(port->cons->flags & CON_ENABLED))) {
|
|
msm_write(port, UART_CR_CMD_PROTECTION_EN, UART_CR);
|
|
msm_reset(port);
|
|
data = UART_CR_TX_ENABLE;
|
|
}
|
|
|
|
data |= UART_CR_RX_ENABLE;
|
|
msm_write(port, data, UART_CR); /* enable TX & RX */
|
|
|
|
/* Make sure IPR is not 0 to start with*/
|
|
if (msm_port->is_uartdm)
|
|
msm_write(port, UART_IPR_STALE_LSB, UART_IPR);
|
|
|
|
/* turn on RX and CTS interrupts */
|
|
msm_port->imr = UART_IMR_RXLEV | UART_IMR_RXSTALE |
|
|
UART_IMR_CURRENT_CTS;
|
|
|
|
if (msm_port->is_uartdm) {
|
|
msm_write(port, 0xFFFFFF, UARTDM_DMRX);
|
|
msm_write(port, UART_CR_CMD_RESET_STALE_INT, UART_CR);
|
|
msm_write(port, UART_CR_CMD_STALE_EVENT_ENABLE, UART_CR);
|
|
}
|
|
|
|
msm_write(port, msm_port->imr, UART_IMR);
|
|
return 0;
|
|
}
|
|
|
|
static void msm_shutdown(struct uart_port *port)
|
|
{
|
|
struct msm_port *msm_port = UART_TO_MSM(port);
|
|
|
|
msm_port->imr = 0;
|
|
msm_write(port, 0, UART_IMR); /* disable interrupts */
|
|
|
|
clk_disable_unprepare(msm_port->clk);
|
|
|
|
free_irq(port->irq, port);
|
|
}
|
|
|
|
static void msm_set_termios(struct uart_port *port, struct ktermios *termios,
|
|
struct ktermios *old)
|
|
{
|
|
unsigned long flags;
|
|
unsigned int baud, mr;
|
|
|
|
spin_lock_irqsave(&port->lock, flags);
|
|
|
|
/* calculate and set baud rate */
|
|
baud = uart_get_baud_rate(port, termios, old, 300, 115200);
|
|
baud = msm_set_baud_rate(port, baud);
|
|
if (tty_termios_baud_rate(termios))
|
|
tty_termios_encode_baud_rate(termios, baud, baud);
|
|
|
|
/* calculate parity */
|
|
mr = msm_read(port, UART_MR2);
|
|
mr &= ~UART_MR2_PARITY_MODE;
|
|
if (termios->c_cflag & PARENB) {
|
|
if (termios->c_cflag & PARODD)
|
|
mr |= UART_MR2_PARITY_MODE_ODD;
|
|
else if (termios->c_cflag & CMSPAR)
|
|
mr |= UART_MR2_PARITY_MODE_SPACE;
|
|
else
|
|
mr |= UART_MR2_PARITY_MODE_EVEN;
|
|
}
|
|
|
|
/* calculate bits per char */
|
|
mr &= ~UART_MR2_BITS_PER_CHAR;
|
|
switch (termios->c_cflag & CSIZE) {
|
|
case CS5:
|
|
mr |= UART_MR2_BITS_PER_CHAR_5;
|
|
break;
|
|
case CS6:
|
|
mr |= UART_MR2_BITS_PER_CHAR_6;
|
|
break;
|
|
case CS7:
|
|
mr |= UART_MR2_BITS_PER_CHAR_7;
|
|
break;
|
|
case CS8:
|
|
default:
|
|
mr |= UART_MR2_BITS_PER_CHAR_8;
|
|
break;
|
|
}
|
|
|
|
/* calculate stop bits */
|
|
mr &= ~(UART_MR2_STOP_BIT_LEN_ONE | UART_MR2_STOP_BIT_LEN_TWO);
|
|
if (termios->c_cflag & CSTOPB)
|
|
mr |= UART_MR2_STOP_BIT_LEN_TWO;
|
|
else
|
|
mr |= UART_MR2_STOP_BIT_LEN_ONE;
|
|
|
|
/* set parity, bits per char, and stop bit */
|
|
msm_write(port, mr, UART_MR2);
|
|
|
|
/* calculate and set hardware flow control */
|
|
mr = msm_read(port, UART_MR1);
|
|
mr &= ~(UART_MR1_CTS_CTL | UART_MR1_RX_RDY_CTL);
|
|
if (termios->c_cflag & CRTSCTS) {
|
|
mr |= UART_MR1_CTS_CTL;
|
|
mr |= UART_MR1_RX_RDY_CTL;
|
|
}
|
|
msm_write(port, mr, UART_MR1);
|
|
|
|
/* Configure status bits to ignore based on termio flags. */
|
|
port->read_status_mask = 0;
|
|
if (termios->c_iflag & INPCK)
|
|
port->read_status_mask |= UART_SR_PAR_FRAME_ERR;
|
|
if (termios->c_iflag & (BRKINT | PARMRK))
|
|
port->read_status_mask |= UART_SR_RX_BREAK;
|
|
|
|
uart_update_timeout(port, termios->c_cflag, baud);
|
|
|
|
spin_unlock_irqrestore(&port->lock, flags);
|
|
}
|
|
|
|
static const char *msm_type(struct uart_port *port)
|
|
{
|
|
return "MSM";
|
|
}
|
|
|
|
static void msm_release_port(struct uart_port *port)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(port->dev);
|
|
struct resource *uart_resource;
|
|
resource_size_t size;
|
|
|
|
uart_resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (unlikely(!uart_resource))
|
|
return;
|
|
size = resource_size(uart_resource);
|
|
|
|
release_mem_region(port->mapbase, size);
|
|
iounmap(port->membase);
|
|
port->membase = NULL;
|
|
}
|
|
|
|
static int msm_request_port(struct uart_port *port)
|
|
{
|
|
struct platform_device *pdev = to_platform_device(port->dev);
|
|
struct resource *uart_resource;
|
|
resource_size_t size;
|
|
int ret;
|
|
|
|
uart_resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
if (unlikely(!uart_resource))
|
|
return -ENXIO;
|
|
|
|
size = resource_size(uart_resource);
|
|
|
|
if (!request_mem_region(port->mapbase, size, "msm_serial"))
|
|
return -EBUSY;
|
|
|
|
port->membase = ioremap(port->mapbase, size);
|
|
if (!port->membase) {
|
|
ret = -EBUSY;
|
|
goto fail_release_port;
|
|
}
|
|
|
|
return 0;
|
|
|
|
fail_release_port:
|
|
release_mem_region(port->mapbase, size);
|
|
return ret;
|
|
}
|
|
|
|
static void msm_config_port(struct uart_port *port, int flags)
|
|
{
|
|
int ret;
|
|
if (flags & UART_CONFIG_TYPE) {
|
|
port->type = PORT_MSM;
|
|
ret = msm_request_port(port);
|
|
if (ret)
|
|
return;
|
|
}
|
|
}
|
|
|
|
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_prepare_enable(msm_port->clk);
|
|
clk_prepare_enable(msm_port->pclk);
|
|
break;
|
|
case 3:
|
|
clk_disable_unprepare(msm_port->clk);
|
|
clk_disable_unprepare(msm_port->pclk);
|
|
break;
|
|
default:
|
|
printk(KERN_ERR "msm_serial: Unknown PM state %d\n", state);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_CONSOLE_POLL
|
|
static int msm_poll_init(struct uart_port *port)
|
|
{
|
|
struct msm_port *msm_port = UART_TO_MSM(port);
|
|
|
|
/* Enable single character mode on RX FIFO */
|
|
if (msm_port->is_uartdm >= UARTDM_1P4)
|
|
msm_write(port, UARTDM_DMEN_RX_SC_ENABLE, UARTDM_DMEN);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int msm_poll_get_char_single(struct uart_port *port)
|
|
{
|
|
struct msm_port *msm_port = UART_TO_MSM(port);
|
|
unsigned int rf_reg = msm_port->is_uartdm ? UARTDM_RF : UART_RF;
|
|
|
|
if (!(msm_read(port, UART_SR) & UART_SR_RX_READY))
|
|
return NO_POLL_CHAR;
|
|
else
|
|
return msm_read(port, rf_reg) & 0xff;
|
|
}
|
|
|
|
static int msm_poll_get_char_dm_1p3(struct uart_port *port)
|
|
{
|
|
int c;
|
|
static u32 slop;
|
|
static int count;
|
|
unsigned char *sp = (unsigned char *)&slop;
|
|
|
|
/* Check if a previous read had more than one char */
|
|
if (count) {
|
|
c = sp[sizeof(slop) - count];
|
|
count--;
|
|
/* Or if FIFO is empty */
|
|
} else if (!(msm_read(port, UART_SR) & UART_SR_RX_READY)) {
|
|
/*
|
|
* If RX packing buffer has less than a word, force stale to
|
|
* push contents into RX FIFO
|
|
*/
|
|
count = msm_read(port, UARTDM_RXFS);
|
|
count = (count >> UARTDM_RXFS_BUF_SHIFT) & UARTDM_RXFS_BUF_MASK;
|
|
if (count) {
|
|
msm_write(port, UART_CR_CMD_FORCE_STALE, UART_CR);
|
|
slop = msm_read(port, UARTDM_RF);
|
|
c = sp[0];
|
|
count--;
|
|
} else {
|
|
c = NO_POLL_CHAR;
|
|
}
|
|
/* FIFO has a word */
|
|
} else {
|
|
slop = msm_read(port, UARTDM_RF);
|
|
c = sp[0];
|
|
count = sizeof(slop) - 1;
|
|
}
|
|
|
|
return c;
|
|
}
|
|
|
|
static int msm_poll_get_char(struct uart_port *port)
|
|
{
|
|
u32 imr;
|
|
int c;
|
|
struct msm_port *msm_port = UART_TO_MSM(port);
|
|
|
|
/* Disable all interrupts */
|
|
imr = msm_read(port, UART_IMR);
|
|
msm_write(port, 0, UART_IMR);
|
|
|
|
if (msm_port->is_uartdm == UARTDM_1P3)
|
|
c = msm_poll_get_char_dm_1p3(port);
|
|
else
|
|
c = msm_poll_get_char_single(port);
|
|
|
|
/* Enable interrupts */
|
|
msm_write(port, imr, UART_IMR);
|
|
|
|
return c;
|
|
}
|
|
|
|
static void msm_poll_put_char(struct uart_port *port, unsigned char c)
|
|
{
|
|
u32 imr;
|
|
struct msm_port *msm_port = UART_TO_MSM(port);
|
|
|
|
/* Disable all interrupts */
|
|
imr = msm_read(port, UART_IMR);
|
|
msm_write(port, 0, UART_IMR);
|
|
|
|
if (msm_port->is_uartdm)
|
|
reset_dm_count(port, 1);
|
|
|
|
/* Wait until FIFO is empty */
|
|
while (!(msm_read(port, UART_SR) & UART_SR_TX_READY))
|
|
cpu_relax();
|
|
|
|
/* Write a character */
|
|
msm_write(port, c, msm_port->is_uartdm ? UARTDM_TF : UART_TF);
|
|
|
|
/* Wait until FIFO is empty */
|
|
while (!(msm_read(port, UART_SR) & UART_SR_TX_READY))
|
|
cpu_relax();
|
|
|
|
/* Enable interrupts */
|
|
msm_write(port, imr, UART_IMR);
|
|
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
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,
|
|
#ifdef CONFIG_CONSOLE_POLL
|
|
.poll_init = msm_poll_init,
|
|
.poll_get_char = msm_poll_get_char,
|
|
.poll_put_char = msm_poll_put_char,
|
|
#endif
|
|
};
|
|
|
|
static struct msm_port msm_uart_ports[] = {
|
|
{
|
|
.uart = {
|
|
.iotype = UPIO_MEM,
|
|
.ops = &msm_uart_pops,
|
|
.flags = UPF_BOOT_AUTOCONF,
|
|
.fifosize = 64,
|
|
.line = 0,
|
|
},
|
|
},
|
|
{
|
|
.uart = {
|
|
.iotype = UPIO_MEM,
|
|
.ops = &msm_uart_pops,
|
|
.flags = UPF_BOOT_AUTOCONF,
|
|
.fifosize = 64,
|
|
.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_write(struct console *co, const char *s,
|
|
unsigned int count)
|
|
{
|
|
int i;
|
|
struct uart_port *port;
|
|
struct msm_port *msm_port;
|
|
int num_newlines = 0;
|
|
bool replaced = false;
|
|
|
|
BUG_ON(co->index < 0 || co->index >= UART_NR);
|
|
|
|
port = get_port_from_line(co->index);
|
|
msm_port = UART_TO_MSM(port);
|
|
|
|
/* Account for newlines that will get a carriage return added */
|
|
for (i = 0; i < count; i++)
|
|
if (s[i] == '\n')
|
|
num_newlines++;
|
|
count += num_newlines;
|
|
|
|
spin_lock(&port->lock);
|
|
if (msm_port->is_uartdm)
|
|
reset_dm_count(port, count);
|
|
|
|
i = 0;
|
|
while (i < count) {
|
|
int j;
|
|
unsigned int num_chars;
|
|
char buf[4] = { 0 };
|
|
unsigned int *bf = (unsigned int *)&buf;
|
|
|
|
if (msm_port->is_uartdm)
|
|
num_chars = min(count - i, (unsigned int)sizeof(buf));
|
|
else
|
|
num_chars = 1;
|
|
|
|
for (j = 0; j < num_chars; j++) {
|
|
char c = *s;
|
|
|
|
if (c == '\n' && !replaced) {
|
|
buf[j] = '\r';
|
|
j++;
|
|
replaced = true;
|
|
}
|
|
if (j < num_chars) {
|
|
buf[j] = c;
|
|
s++;
|
|
replaced = false;
|
|
}
|
|
}
|
|
|
|
while (!(msm_read(port, UART_SR) & UART_SR_TX_READY))
|
|
cpu_relax();
|
|
|
|
msm_write(port, *bf, msm_port->is_uartdm ? UARTDM_TF : UART_TF);
|
|
i += num_chars;
|
|
}
|
|
spin_unlock(&port->lock);
|
|
}
|
|
|
|
static int __init msm_console_setup(struct console *co, char *options)
|
|
{
|
|
struct uart_port *port;
|
|
struct msm_port *msm_port;
|
|
int baud, flow, bits, parity;
|
|
|
|
if (unlikely(co->index >= UART_NR || co->index < 0))
|
|
return -ENXIO;
|
|
|
|
port = get_port_from_line(co->index);
|
|
msm_port = UART_TO_MSM(port);
|
|
|
|
if (unlikely(!port->membase))
|
|
return -ENXIO;
|
|
|
|
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);
|
|
|
|
if (msm_port->is_uartdm) {
|
|
msm_write(port, UART_CR_CMD_PROTECTION_EN, UART_CR);
|
|
msm_write(port, UART_CR_TX_ENABLE, UART_CR);
|
|
}
|
|
|
|
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 atomic_t msm_uart_next_id = ATOMIC_INIT(0);
|
|
|
|
static const struct of_device_id msm_uartdm_table[] = {
|
|
{ .compatible = "qcom,msm-uartdm-v1.1", .data = (void *)UARTDM_1P1 },
|
|
{ .compatible = "qcom,msm-uartdm-v1.2", .data = (void *)UARTDM_1P2 },
|
|
{ .compatible = "qcom,msm-uartdm-v1.3", .data = (void *)UARTDM_1P3 },
|
|
{ .compatible = "qcom,msm-uartdm-v1.4", .data = (void *)UARTDM_1P4 },
|
|
{ }
|
|
};
|
|
|
|
static int __init msm_serial_probe(struct platform_device *pdev)
|
|
{
|
|
struct msm_port *msm_port;
|
|
struct resource *resource;
|
|
struct uart_port *port;
|
|
const struct of_device_id *id;
|
|
int irq;
|
|
|
|
if (pdev->id == -1)
|
|
pdev->id = atomic_inc_return(&msm_uart_next_id) - 1;
|
|
|
|
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);
|
|
|
|
id = of_match_device(msm_uartdm_table, &pdev->dev);
|
|
if (id)
|
|
msm_port->is_uartdm = (unsigned long)id->data;
|
|
else
|
|
msm_port->is_uartdm = 0;
|
|
|
|
msm_port->clk = devm_clk_get(&pdev->dev, "core");
|
|
if (IS_ERR(msm_port->clk))
|
|
return PTR_ERR(msm_port->clk);
|
|
|
|
if (msm_port->is_uartdm) {
|
|
msm_port->pclk = devm_clk_get(&pdev->dev, "iface");
|
|
if (IS_ERR(msm_port->pclk))
|
|
return PTR_ERR(msm_port->pclk);
|
|
|
|
clk_set_rate(msm_port->clk, 1843200);
|
|
}
|
|
|
|
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 msm_serial_remove(struct platform_device *pdev)
|
|
{
|
|
struct uart_port *port = platform_get_drvdata(pdev);
|
|
|
|
uart_remove_one_port(&msm_uart_driver, port);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct of_device_id msm_match_table[] = {
|
|
{ .compatible = "qcom,msm-uart" },
|
|
{ .compatible = "qcom,msm-uartdm" },
|
|
{}
|
|
};
|
|
|
|
static struct platform_driver msm_platform_driver = {
|
|
.remove = msm_serial_remove,
|
|
.probe = msm_serial_probe,
|
|
.driver = {
|
|
.name = "msm_serial",
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = msm_match_table,
|
|
},
|
|
};
|
|
|
|
static int __init msm_serial_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = uart_register_driver(&msm_uart_driver);
|
|
if (unlikely(ret))
|
|
return ret;
|
|
|
|
ret = platform_driver_register(&msm_platform_driver);
|
|
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");
|