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![Alexey Khoroshilov](/assets/img/avatar_default.png)
The driver does ioremap(port->mapbase, ALTERA_JTAGUART_SIZE), but there is no any iounmap(). Found by Linux Driver Verification project (linuxtesting.org). Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru> Acked-by: Tobias Klauser <tklauser@distanz.ch> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
529 lines
14 KiB
C
529 lines
14 KiB
C
/*
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* altera_jtaguart.c -- Altera JTAG UART driver
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*
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* Based on mcf.c -- Freescale ColdFire UART driver
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*
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* (C) Copyright 2003-2007, Greg Ungerer <gerg@snapgear.com>
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* (C) Copyright 2008, Thomas Chou <thomas@wytron.com.tw>
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* (C) Copyright 2010, Tobias Klauser <tklauser@distanz.ch>
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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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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/console.h>
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#include <linux/of.h>
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#include <linux/serial.h>
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#include <linux/serial_core.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/altera_jtaguart.h>
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#define DRV_NAME "altera_jtaguart"
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/*
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* Altera JTAG UART register definitions according to the Altera JTAG UART
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* datasheet: http://www.altera.com/literature/hb/nios2/n2cpu_nii51009.pdf
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*/
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#define ALTERA_JTAGUART_SIZE 8
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#define ALTERA_JTAGUART_DATA_REG 0
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#define ALTERA_JTAGUART_DATA_DATA_MSK 0x000000FF
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#define ALTERA_JTAGUART_DATA_RVALID_MSK 0x00008000
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#define ALTERA_JTAGUART_DATA_RAVAIL_MSK 0xFFFF0000
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#define ALTERA_JTAGUART_DATA_RAVAIL_OFF 16
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#define ALTERA_JTAGUART_CONTROL_REG 4
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#define ALTERA_JTAGUART_CONTROL_RE_MSK 0x00000001
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#define ALTERA_JTAGUART_CONTROL_WE_MSK 0x00000002
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#define ALTERA_JTAGUART_CONTROL_RI_MSK 0x00000100
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#define ALTERA_JTAGUART_CONTROL_RI_OFF 8
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#define ALTERA_JTAGUART_CONTROL_WI_MSK 0x00000200
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#define ALTERA_JTAGUART_CONTROL_AC_MSK 0x00000400
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#define ALTERA_JTAGUART_CONTROL_WSPACE_MSK 0xFFFF0000
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#define ALTERA_JTAGUART_CONTROL_WSPACE_OFF 16
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/*
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* Local per-uart structure.
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*/
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struct altera_jtaguart {
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struct uart_port port;
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unsigned int sigs; /* Local copy of line sigs */
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unsigned long imr; /* Local IMR mirror */
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};
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static unsigned int altera_jtaguart_tx_empty(struct uart_port *port)
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{
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return (readl(port->membase + ALTERA_JTAGUART_CONTROL_REG) &
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ALTERA_JTAGUART_CONTROL_WSPACE_MSK) ? TIOCSER_TEMT : 0;
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}
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static unsigned int altera_jtaguart_get_mctrl(struct uart_port *port)
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{
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return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS;
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}
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static void altera_jtaguart_set_mctrl(struct uart_port *port, unsigned int sigs)
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{
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}
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static void altera_jtaguart_start_tx(struct uart_port *port)
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{
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struct altera_jtaguart *pp =
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container_of(port, struct altera_jtaguart, port);
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pp->imr |= ALTERA_JTAGUART_CONTROL_WE_MSK;
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writel(pp->imr, port->membase + ALTERA_JTAGUART_CONTROL_REG);
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}
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static void altera_jtaguart_stop_tx(struct uart_port *port)
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{
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struct altera_jtaguart *pp =
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container_of(port, struct altera_jtaguart, port);
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pp->imr &= ~ALTERA_JTAGUART_CONTROL_WE_MSK;
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writel(pp->imr, port->membase + ALTERA_JTAGUART_CONTROL_REG);
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}
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static void altera_jtaguart_stop_rx(struct uart_port *port)
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{
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struct altera_jtaguart *pp =
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container_of(port, struct altera_jtaguart, port);
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pp->imr &= ~ALTERA_JTAGUART_CONTROL_RE_MSK;
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writel(pp->imr, port->membase + ALTERA_JTAGUART_CONTROL_REG);
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}
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static void altera_jtaguart_break_ctl(struct uart_port *port, int break_state)
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{
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}
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static void altera_jtaguart_set_termios(struct uart_port *port,
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struct ktermios *termios,
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struct ktermios *old)
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{
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/* Just copy the old termios settings back */
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if (old)
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tty_termios_copy_hw(termios, old);
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}
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static void altera_jtaguart_rx_chars(struct altera_jtaguart *pp)
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{
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struct uart_port *port = &pp->port;
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unsigned char ch, flag;
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unsigned long status;
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while ((status = readl(port->membase + ALTERA_JTAGUART_DATA_REG)) &
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ALTERA_JTAGUART_DATA_RVALID_MSK) {
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ch = status & ALTERA_JTAGUART_DATA_DATA_MSK;
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flag = TTY_NORMAL;
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port->icount.rx++;
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if (uart_handle_sysrq_char(port, ch))
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continue;
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uart_insert_char(port, 0, 0, ch, flag);
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}
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spin_unlock(&port->lock);
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tty_flip_buffer_push(&port->state->port);
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spin_lock(&port->lock);
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}
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static void altera_jtaguart_tx_chars(struct altera_jtaguart *pp)
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{
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struct uart_port *port = &pp->port;
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struct circ_buf *xmit = &port->state->xmit;
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unsigned int pending, count;
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if (port->x_char) {
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/* Send special char - probably flow control */
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writel(port->x_char, port->membase + ALTERA_JTAGUART_DATA_REG);
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port->x_char = 0;
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port->icount.tx++;
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return;
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}
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pending = uart_circ_chars_pending(xmit);
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if (pending > 0) {
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count = (readl(port->membase + ALTERA_JTAGUART_CONTROL_REG) &
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ALTERA_JTAGUART_CONTROL_WSPACE_MSK) >>
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ALTERA_JTAGUART_CONTROL_WSPACE_OFF;
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if (count > pending)
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count = pending;
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if (count > 0) {
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pending -= count;
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while (count--) {
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writel(xmit->buf[xmit->tail],
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port->membase + ALTERA_JTAGUART_DATA_REG);
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xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
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port->icount.tx++;
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}
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if (pending < WAKEUP_CHARS)
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uart_write_wakeup(port);
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}
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}
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if (pending == 0) {
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pp->imr &= ~ALTERA_JTAGUART_CONTROL_WE_MSK;
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writel(pp->imr, port->membase + ALTERA_JTAGUART_CONTROL_REG);
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}
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}
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static irqreturn_t altera_jtaguart_interrupt(int irq, void *data)
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{
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struct uart_port *port = data;
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struct altera_jtaguart *pp =
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container_of(port, struct altera_jtaguart, port);
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unsigned int isr;
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isr = (readl(port->membase + ALTERA_JTAGUART_CONTROL_REG) >>
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ALTERA_JTAGUART_CONTROL_RI_OFF) & pp->imr;
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spin_lock(&port->lock);
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if (isr & ALTERA_JTAGUART_CONTROL_RE_MSK)
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altera_jtaguart_rx_chars(pp);
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if (isr & ALTERA_JTAGUART_CONTROL_WE_MSK)
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altera_jtaguart_tx_chars(pp);
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spin_unlock(&port->lock);
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return IRQ_RETVAL(isr);
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}
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static void altera_jtaguart_config_port(struct uart_port *port, int flags)
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{
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port->type = PORT_ALTERA_JTAGUART;
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/* Clear mask, so no surprise interrupts. */
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writel(0, port->membase + ALTERA_JTAGUART_CONTROL_REG);
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}
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static int altera_jtaguart_startup(struct uart_port *port)
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{
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struct altera_jtaguart *pp =
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container_of(port, struct altera_jtaguart, port);
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unsigned long flags;
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int ret;
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ret = request_irq(port->irq, altera_jtaguart_interrupt, 0,
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DRV_NAME, port);
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if (ret) {
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pr_err(DRV_NAME ": unable to attach Altera JTAG UART %d "
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"interrupt vector=%d\n", port->line, port->irq);
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return ret;
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}
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spin_lock_irqsave(&port->lock, flags);
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/* Enable RX interrupts now */
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pp->imr = ALTERA_JTAGUART_CONTROL_RE_MSK;
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writel(pp->imr, port->membase + ALTERA_JTAGUART_CONTROL_REG);
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spin_unlock_irqrestore(&port->lock, flags);
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return 0;
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}
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static void altera_jtaguart_shutdown(struct uart_port *port)
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{
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struct altera_jtaguart *pp =
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container_of(port, struct altera_jtaguart, port);
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unsigned long flags;
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spin_lock_irqsave(&port->lock, flags);
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/* Disable all interrupts now */
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pp->imr = 0;
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writel(pp->imr, port->membase + ALTERA_JTAGUART_CONTROL_REG);
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spin_unlock_irqrestore(&port->lock, flags);
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free_irq(port->irq, port);
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}
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static const char *altera_jtaguart_type(struct uart_port *port)
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{
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return (port->type == PORT_ALTERA_JTAGUART) ? "Altera JTAG UART" : NULL;
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}
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static int altera_jtaguart_request_port(struct uart_port *port)
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{
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/* UARTs always present */
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return 0;
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}
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static void altera_jtaguart_release_port(struct uart_port *port)
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{
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/* Nothing to release... */
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}
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static int altera_jtaguart_verify_port(struct uart_port *port,
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struct serial_struct *ser)
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{
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if (ser->type != PORT_UNKNOWN && ser->type != PORT_ALTERA_JTAGUART)
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return -EINVAL;
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return 0;
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}
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/*
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* Define the basic serial functions we support.
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*/
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static const struct uart_ops altera_jtaguart_ops = {
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.tx_empty = altera_jtaguart_tx_empty,
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.get_mctrl = altera_jtaguart_get_mctrl,
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.set_mctrl = altera_jtaguart_set_mctrl,
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.start_tx = altera_jtaguart_start_tx,
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.stop_tx = altera_jtaguart_stop_tx,
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.stop_rx = altera_jtaguart_stop_rx,
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.break_ctl = altera_jtaguart_break_ctl,
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.startup = altera_jtaguart_startup,
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.shutdown = altera_jtaguart_shutdown,
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.set_termios = altera_jtaguart_set_termios,
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.type = altera_jtaguart_type,
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.request_port = altera_jtaguart_request_port,
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.release_port = altera_jtaguart_release_port,
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.config_port = altera_jtaguart_config_port,
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.verify_port = altera_jtaguart_verify_port,
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};
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#define ALTERA_JTAGUART_MAXPORTS 1
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static struct altera_jtaguart altera_jtaguart_ports[ALTERA_JTAGUART_MAXPORTS];
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#if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE)
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#if defined(CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE_BYPASS)
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static void altera_jtaguart_console_putc(struct uart_port *port, int c)
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{
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unsigned long status;
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unsigned long flags;
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spin_lock_irqsave(&port->lock, flags);
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while (((status = readl(port->membase + ALTERA_JTAGUART_CONTROL_REG)) &
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ALTERA_JTAGUART_CONTROL_WSPACE_MSK) == 0) {
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if ((status & ALTERA_JTAGUART_CONTROL_AC_MSK) == 0) {
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spin_unlock_irqrestore(&port->lock, flags);
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return; /* no connection activity */
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}
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spin_unlock_irqrestore(&port->lock, flags);
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cpu_relax();
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spin_lock_irqsave(&port->lock, flags);
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}
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writel(c, port->membase + ALTERA_JTAGUART_DATA_REG);
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spin_unlock_irqrestore(&port->lock, flags);
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}
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#else
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static void altera_jtaguart_console_putc(struct uart_port *port, int c)
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{
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unsigned long flags;
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spin_lock_irqsave(&port->lock, flags);
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while ((readl(port->membase + ALTERA_JTAGUART_CONTROL_REG) &
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ALTERA_JTAGUART_CONTROL_WSPACE_MSK) == 0) {
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spin_unlock_irqrestore(&port->lock, flags);
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cpu_relax();
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spin_lock_irqsave(&port->lock, flags);
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}
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writel(c, port->membase + ALTERA_JTAGUART_DATA_REG);
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spin_unlock_irqrestore(&port->lock, flags);
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}
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#endif
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static void altera_jtaguart_console_write(struct console *co, const char *s,
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unsigned int count)
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{
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struct uart_port *port = &(altera_jtaguart_ports + co->index)->port;
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uart_console_write(port, s, count, altera_jtaguart_console_putc);
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}
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static int __init altera_jtaguart_console_setup(struct console *co,
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char *options)
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{
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struct uart_port *port;
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if (co->index < 0 || co->index >= ALTERA_JTAGUART_MAXPORTS)
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return -EINVAL;
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port = &altera_jtaguart_ports[co->index].port;
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if (port->membase == NULL)
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return -ENODEV;
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return 0;
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}
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static struct uart_driver altera_jtaguart_driver;
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static struct console altera_jtaguart_console = {
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.name = "ttyJ",
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.write = altera_jtaguart_console_write,
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.device = uart_console_device,
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.setup = altera_jtaguart_console_setup,
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.flags = CON_PRINTBUFFER,
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.index = -1,
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.data = &altera_jtaguart_driver,
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};
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static int __init altera_jtaguart_console_init(void)
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{
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register_console(&altera_jtaguart_console);
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return 0;
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}
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console_initcall(altera_jtaguart_console_init);
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#define ALTERA_JTAGUART_CONSOLE (&altera_jtaguart_console)
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static void altera_jtaguart_earlycon_write(struct console *co, const char *s,
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unsigned int count)
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{
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struct earlycon_device *dev = co->data;
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uart_console_write(&dev->port, s, count, altera_jtaguart_console_putc);
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}
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static int __init altera_jtaguart_earlycon_setup(struct earlycon_device *dev,
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const char *options)
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{
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if (!dev->port.membase)
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return -ENODEV;
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dev->con->write = altera_jtaguart_earlycon_write;
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return 0;
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}
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OF_EARLYCON_DECLARE(juart, "altr,juart-1.0", altera_jtaguart_earlycon_setup);
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#else
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#define ALTERA_JTAGUART_CONSOLE NULL
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#endif /* CONFIG_SERIAL_ALTERA_JTAGUART_CONSOLE */
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static struct uart_driver altera_jtaguart_driver = {
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.owner = THIS_MODULE,
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.driver_name = "altera_jtaguart",
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.dev_name = "ttyJ",
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.major = ALTERA_JTAGUART_MAJOR,
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.minor = ALTERA_JTAGUART_MINOR,
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.nr = ALTERA_JTAGUART_MAXPORTS,
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.cons = ALTERA_JTAGUART_CONSOLE,
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};
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static int altera_jtaguart_probe(struct platform_device *pdev)
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{
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struct altera_jtaguart_platform_uart *platp =
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dev_get_platdata(&pdev->dev);
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struct uart_port *port;
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struct resource *res_irq, *res_mem;
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int i = pdev->id;
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/* -1 emphasizes that the platform must have one port, no .N suffix */
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if (i == -1)
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i = 0;
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if (i >= ALTERA_JTAGUART_MAXPORTS)
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return -EINVAL;
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port = &altera_jtaguart_ports[i].port;
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res_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (res_mem)
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port->mapbase = res_mem->start;
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else if (platp)
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port->mapbase = platp->mapbase;
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else
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return -ENODEV;
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res_irq = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
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if (res_irq)
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port->irq = res_irq->start;
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else if (platp)
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port->irq = platp->irq;
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else
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return -ENODEV;
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port->membase = ioremap(port->mapbase, ALTERA_JTAGUART_SIZE);
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if (!port->membase)
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return -ENOMEM;
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port->line = i;
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port->type = PORT_ALTERA_JTAGUART;
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port->iotype = SERIAL_IO_MEM;
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port->ops = &altera_jtaguart_ops;
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port->flags = UPF_BOOT_AUTOCONF;
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port->dev = &pdev->dev;
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uart_add_one_port(&altera_jtaguart_driver, port);
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return 0;
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}
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static int altera_jtaguart_remove(struct platform_device *pdev)
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{
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struct uart_port *port;
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int i = pdev->id;
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|
|
if (i == -1)
|
|
i = 0;
|
|
|
|
port = &altera_jtaguart_ports[i].port;
|
|
uart_remove_one_port(&altera_jtaguart_driver, port);
|
|
iounmap(port->membase);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_OF
|
|
static const struct of_device_id altera_jtaguart_match[] = {
|
|
{ .compatible = "ALTR,juart-1.0", },
|
|
{ .compatible = "altr,juart-1.0", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, altera_jtaguart_match);
|
|
#endif /* CONFIG_OF */
|
|
|
|
static struct platform_driver altera_jtaguart_platform_driver = {
|
|
.probe = altera_jtaguart_probe,
|
|
.remove = altera_jtaguart_remove,
|
|
.driver = {
|
|
.name = DRV_NAME,
|
|
.of_match_table = of_match_ptr(altera_jtaguart_match),
|
|
},
|
|
};
|
|
|
|
static int __init altera_jtaguart_init(void)
|
|
{
|
|
int rc;
|
|
|
|
rc = uart_register_driver(&altera_jtaguart_driver);
|
|
if (rc)
|
|
return rc;
|
|
rc = platform_driver_register(&altera_jtaguart_platform_driver);
|
|
if (rc)
|
|
uart_unregister_driver(&altera_jtaguart_driver);
|
|
return rc;
|
|
}
|
|
|
|
static void __exit altera_jtaguart_exit(void)
|
|
{
|
|
platform_driver_unregister(&altera_jtaguart_platform_driver);
|
|
uart_unregister_driver(&altera_jtaguart_driver);
|
|
}
|
|
|
|
module_init(altera_jtaguart_init);
|
|
module_exit(altera_jtaguart_exit);
|
|
|
|
MODULE_DESCRIPTION("Altera JTAG UART driver");
|
|
MODULE_AUTHOR("Thomas Chou <thomas@wytron.com.tw>");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:" DRV_NAME);
|