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690 lines
16 KiB
690 lines
16 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Driver for GRLIB serial ports (APBUART) |
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* |
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* Based on linux/drivers/serial/amba.c |
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* |
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* Copyright (C) 2000 Deep Blue Solutions Ltd. |
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* Copyright (C) 2003 Konrad Eisele <[email protected]> |
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* Copyright (C) 2006 Daniel Hellstrom <[email protected]>, Aeroflex Gaisler AB |
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* Copyright (C) 2008 Gilead Kutnick <[email protected]> |
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* Copyright (C) 2009 Kristoffer Glembo <[email protected]>, Aeroflex Gaisler AB |
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*/ |
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#include <linux/module.h> |
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#include <linux/tty.h> |
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#include <linux/tty_flip.h> |
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#include <linux/ioport.h> |
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#include <linux/init.h> |
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#include <linux/serial.h> |
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#include <linux/console.h> |
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#include <linux/sysrq.h> |
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#include <linux/kthread.h> |
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#include <linux/device.h> |
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#include <linux/of.h> |
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#include <linux/of_device.h> |
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#include <linux/of_platform.h> |
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#include <linux/of_irq.h> |
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#include <linux/platform_device.h> |
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#include <linux/io.h> |
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#include <linux/serial_core.h> |
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#include <asm/irq.h> |
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#include "apbuart.h" |
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#define SERIAL_APBUART_MAJOR TTY_MAJOR |
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#define SERIAL_APBUART_MINOR 64 |
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#define UART_DUMMY_RSR_RX 0x8000 /* for ignore all read */ |
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static void apbuart_tx_chars(struct uart_port *port); |
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static void apbuart_stop_tx(struct uart_port *port) |
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{ |
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unsigned int cr; |
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cr = UART_GET_CTRL(port); |
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cr &= ~UART_CTRL_TI; |
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UART_PUT_CTRL(port, cr); |
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} |
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static void apbuart_start_tx(struct uart_port *port) |
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{ |
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unsigned int cr; |
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cr = UART_GET_CTRL(port); |
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cr |= UART_CTRL_TI; |
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UART_PUT_CTRL(port, cr); |
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if (UART_GET_STATUS(port) & UART_STATUS_THE) |
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apbuart_tx_chars(port); |
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} |
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static void apbuart_stop_rx(struct uart_port *port) |
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{ |
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unsigned int cr; |
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cr = UART_GET_CTRL(port); |
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cr &= ~(UART_CTRL_RI); |
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UART_PUT_CTRL(port, cr); |
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} |
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static void apbuart_rx_chars(struct uart_port *port) |
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{ |
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unsigned int status, ch, rsr, flag; |
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unsigned int max_chars = port->fifosize; |
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status = UART_GET_STATUS(port); |
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while (UART_RX_DATA(status) && (max_chars--)) { |
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ch = UART_GET_CHAR(port); |
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flag = TTY_NORMAL; |
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port->icount.rx++; |
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rsr = UART_GET_STATUS(port) | UART_DUMMY_RSR_RX; |
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UART_PUT_STATUS(port, 0); |
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if (rsr & UART_STATUS_ERR) { |
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if (rsr & UART_STATUS_BR) { |
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rsr &= ~(UART_STATUS_FE | UART_STATUS_PE); |
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port->icount.brk++; |
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if (uart_handle_break(port)) |
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goto ignore_char; |
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} else if (rsr & UART_STATUS_PE) { |
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port->icount.parity++; |
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} else if (rsr & UART_STATUS_FE) { |
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port->icount.frame++; |
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} |
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if (rsr & UART_STATUS_OE) |
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port->icount.overrun++; |
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rsr &= port->read_status_mask; |
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if (rsr & UART_STATUS_PE) |
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flag = TTY_PARITY; |
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else if (rsr & UART_STATUS_FE) |
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flag = TTY_FRAME; |
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} |
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if (uart_handle_sysrq_char(port, ch)) |
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goto ignore_char; |
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uart_insert_char(port, rsr, UART_STATUS_OE, ch, flag); |
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ignore_char: |
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status = UART_GET_STATUS(port); |
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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 apbuart_tx_chars(struct uart_port *port) |
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{ |
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struct circ_buf *xmit = &port->state->xmit; |
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int count; |
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if (port->x_char) { |
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UART_PUT_CHAR(port, port->x_char); |
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port->icount.tx++; |
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port->x_char = 0; |
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return; |
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} |
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if (uart_circ_empty(xmit) || uart_tx_stopped(port)) { |
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apbuart_stop_tx(port); |
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return; |
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} |
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/* amba: fill FIFO */ |
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count = port->fifosize >> 1; |
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do { |
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UART_PUT_CHAR(port, xmit->buf[xmit->tail]); |
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xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); |
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port->icount.tx++; |
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if (uart_circ_empty(xmit)) |
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break; |
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} while (--count > 0); |
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if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) |
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uart_write_wakeup(port); |
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if (uart_circ_empty(xmit)) |
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apbuart_stop_tx(port); |
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} |
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static irqreturn_t apbuart_int(int irq, void *dev_id) |
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{ |
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struct uart_port *port = dev_id; |
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unsigned int status; |
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spin_lock(&port->lock); |
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status = UART_GET_STATUS(port); |
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if (status & UART_STATUS_DR) |
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apbuart_rx_chars(port); |
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if (status & UART_STATUS_THE) |
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apbuart_tx_chars(port); |
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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 apbuart_tx_empty(struct uart_port *port) |
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{ |
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unsigned int status = UART_GET_STATUS(port); |
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return status & UART_STATUS_THE ? TIOCSER_TEMT : 0; |
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} |
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static unsigned int apbuart_get_mctrl(struct uart_port *port) |
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{ |
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/* The GRLIB APBUART handles flow control in hardware */ |
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return TIOCM_CAR | TIOCM_DSR | TIOCM_CTS; |
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} |
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static void apbuart_set_mctrl(struct uart_port *port, unsigned int mctrl) |
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{ |
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/* The GRLIB APBUART handles flow control in hardware */ |
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} |
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static void apbuart_break_ctl(struct uart_port *port, int break_state) |
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{ |
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/* We don't support sending break */ |
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} |
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static int apbuart_startup(struct uart_port *port) |
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{ |
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int retval; |
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unsigned int cr; |
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/* Allocate the IRQ */ |
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retval = request_irq(port->irq, apbuart_int, 0, "apbuart", port); |
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if (retval) |
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return retval; |
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/* Finally, enable interrupts */ |
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cr = UART_GET_CTRL(port); |
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UART_PUT_CTRL(port, |
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cr | UART_CTRL_RE | UART_CTRL_TE | |
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UART_CTRL_RI | UART_CTRL_TI); |
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return 0; |
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} |
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static void apbuart_shutdown(struct uart_port *port) |
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{ |
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unsigned int cr; |
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/* disable all interrupts, disable the port */ |
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cr = UART_GET_CTRL(port); |
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UART_PUT_CTRL(port, |
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cr & ~(UART_CTRL_RE | UART_CTRL_TE | |
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UART_CTRL_RI | UART_CTRL_TI)); |
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/* Free the interrupt */ |
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free_irq(port->irq, port); |
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} |
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static void apbuart_set_termios(struct uart_port *port, |
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struct ktermios *termios, struct ktermios *old) |
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{ |
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unsigned int cr; |
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unsigned long flags; |
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unsigned int baud, quot; |
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/* Ask the core to calculate the divisor for us. */ |
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baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk / 16); |
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if (baud == 0) |
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panic("invalid baudrate %i\n", port->uartclk / 16); |
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/* uart_get_divisor calc a *16 uart freq, apbuart is *8 */ |
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quot = (uart_get_divisor(port, baud)) * 2; |
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cr = UART_GET_CTRL(port); |
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cr &= ~(UART_CTRL_PE | UART_CTRL_PS); |
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if (termios->c_cflag & PARENB) { |
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cr |= UART_CTRL_PE; |
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if ((termios->c_cflag & PARODD)) |
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cr |= UART_CTRL_PS; |
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} |
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/* Enable flow control. */ |
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if (termios->c_cflag & CRTSCTS) |
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cr |= UART_CTRL_FL; |
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spin_lock_irqsave(&port->lock, flags); |
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/* Update the per-port timeout. */ |
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uart_update_timeout(port, termios->c_cflag, baud); |
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port->read_status_mask = UART_STATUS_OE; |
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if (termios->c_iflag & INPCK) |
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port->read_status_mask |= UART_STATUS_FE | UART_STATUS_PE; |
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/* Characters to ignore */ |
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port->ignore_status_mask = 0; |
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if (termios->c_iflag & IGNPAR) |
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port->ignore_status_mask |= UART_STATUS_FE | UART_STATUS_PE; |
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/* Ignore all characters if CREAD is not set. */ |
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if ((termios->c_cflag & CREAD) == 0) |
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port->ignore_status_mask |= UART_DUMMY_RSR_RX; |
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/* Set baud rate */ |
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quot -= 1; |
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UART_PUT_SCAL(port, quot); |
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UART_PUT_CTRL(port, cr); |
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spin_unlock_irqrestore(&port->lock, flags); |
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} |
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static const char *apbuart_type(struct uart_port *port) |
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{ |
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return port->type == PORT_APBUART ? "GRLIB/APBUART" : NULL; |
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} |
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static void apbuart_release_port(struct uart_port *port) |
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{ |
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release_mem_region(port->mapbase, 0x100); |
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} |
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static int apbuart_request_port(struct uart_port *port) |
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{ |
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return request_mem_region(port->mapbase, 0x100, "grlib-apbuart") |
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!= NULL ? 0 : -EBUSY; |
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return 0; |
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} |
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/* Configure/autoconfigure the port */ |
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static void apbuart_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_APBUART; |
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apbuart_request_port(port); |
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} |
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} |
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/* Verify the new serial_struct (for TIOCSSERIAL) */ |
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static int apbuart_verify_port(struct uart_port *port, |
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struct serial_struct *ser) |
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{ |
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int ret = 0; |
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if (ser->type != PORT_UNKNOWN && ser->type != PORT_APBUART) |
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ret = -EINVAL; |
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if (ser->irq < 0 || ser->irq >= NR_IRQS) |
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ret = -EINVAL; |
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if (ser->baud_base < 9600) |
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ret = -EINVAL; |
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return ret; |
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} |
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static const struct uart_ops grlib_apbuart_ops = { |
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.tx_empty = apbuart_tx_empty, |
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.set_mctrl = apbuart_set_mctrl, |
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.get_mctrl = apbuart_get_mctrl, |
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.stop_tx = apbuart_stop_tx, |
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.start_tx = apbuart_start_tx, |
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.stop_rx = apbuart_stop_rx, |
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.break_ctl = apbuart_break_ctl, |
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.startup = apbuart_startup, |
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.shutdown = apbuart_shutdown, |
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.set_termios = apbuart_set_termios, |
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.type = apbuart_type, |
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.release_port = apbuart_release_port, |
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.request_port = apbuart_request_port, |
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.config_port = apbuart_config_port, |
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.verify_port = apbuart_verify_port, |
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}; |
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static struct uart_port grlib_apbuart_ports[UART_NR]; |
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static struct device_node *grlib_apbuart_nodes[UART_NR]; |
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static int apbuart_scan_fifo_size(struct uart_port *port, int portnumber) |
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{ |
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int ctrl, loop = 0; |
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int status; |
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int fifosize; |
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unsigned long flags; |
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ctrl = UART_GET_CTRL(port); |
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/* |
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* Enable the transceiver and wait for it to be ready to send data. |
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* Clear interrupts so that this process will not be externally |
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* interrupted in the middle (which can cause the transceiver to |
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* drain prematurely). |
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*/ |
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local_irq_save(flags); |
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UART_PUT_CTRL(port, ctrl | UART_CTRL_TE); |
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while (!UART_TX_READY(UART_GET_STATUS(port))) |
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loop++; |
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/* |
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* Disable the transceiver so data isn't actually sent during the |
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* actual test. |
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*/ |
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UART_PUT_CTRL(port, ctrl & ~(UART_CTRL_TE)); |
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fifosize = 1; |
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UART_PUT_CHAR(port, 0); |
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/* |
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* So long as transmitting a character increments the tranceivier FIFO |
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* length the FIFO must be at least that big. These bytes will |
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* automatically drain off of the FIFO. |
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*/ |
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status = UART_GET_STATUS(port); |
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while (((status >> 20) & 0x3F) == fifosize) { |
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fifosize++; |
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UART_PUT_CHAR(port, 0); |
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status = UART_GET_STATUS(port); |
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} |
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fifosize--; |
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UART_PUT_CTRL(port, ctrl); |
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local_irq_restore(flags); |
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if (fifosize == 0) |
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fifosize = 1; |
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return fifosize; |
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} |
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static void apbuart_flush_fifo(struct uart_port *port) |
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{ |
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int i; |
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for (i = 0; i < port->fifosize; i++) |
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UART_GET_CHAR(port); |
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} |
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/* ======================================================================== */ |
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/* Console driver, if enabled */ |
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/* ======================================================================== */ |
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#ifdef CONFIG_SERIAL_GRLIB_GAISLER_APBUART_CONSOLE |
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static void apbuart_console_putchar(struct uart_port *port, int ch) |
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{ |
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unsigned int status; |
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do { |
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status = UART_GET_STATUS(port); |
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} while (!UART_TX_READY(status)); |
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UART_PUT_CHAR(port, ch); |
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} |
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static void |
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apbuart_console_write(struct console *co, const char *s, unsigned int count) |
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{ |
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struct uart_port *port = &grlib_apbuart_ports[co->index]; |
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unsigned int status, old_cr, new_cr; |
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/* First save the CR then disable the interrupts */ |
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old_cr = UART_GET_CTRL(port); |
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new_cr = old_cr & ~(UART_CTRL_RI | UART_CTRL_TI); |
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UART_PUT_CTRL(port, new_cr); |
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uart_console_write(port, s, count, apbuart_console_putchar); |
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/* |
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* Finally, wait for transmitter to become empty |
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* and restore the TCR |
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*/ |
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do { |
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status = UART_GET_STATUS(port); |
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} while (!UART_TX_READY(status)); |
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UART_PUT_CTRL(port, old_cr); |
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} |
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static void __init |
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apbuart_console_get_options(struct uart_port *port, int *baud, |
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int *parity, int *bits) |
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{ |
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if (UART_GET_CTRL(port) & (UART_CTRL_RE | UART_CTRL_TE)) { |
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unsigned int quot, status; |
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status = UART_GET_STATUS(port); |
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*parity = 'n'; |
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if (status & UART_CTRL_PE) { |
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if ((status & UART_CTRL_PS) == 0) |
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*parity = 'e'; |
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else |
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*parity = 'o'; |
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} |
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*bits = 8; |
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quot = UART_GET_SCAL(port) / 8; |
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*baud = port->uartclk / (16 * (quot + 1)); |
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} |
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} |
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static int __init apbuart_console_setup(struct console *co, char *options) |
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{ |
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struct uart_port *port; |
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int baud = 38400; |
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int bits = 8; |
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int parity = 'n'; |
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int flow = 'n'; |
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pr_debug("apbuart_console_setup co=%p, co->index=%i, options=%s\n", |
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co, co->index, options); |
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/* |
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* Check whether an invalid uart number has been specified, and |
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* if so, search for the first available port that does have |
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* console support. |
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*/ |
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if (co->index >= grlib_apbuart_port_nr) |
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co->index = 0; |
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port = &grlib_apbuart_ports[co->index]; |
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spin_lock_init(&port->lock); |
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if (options) |
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uart_parse_options(options, &baud, &parity, &bits, &flow); |
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else |
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apbuart_console_get_options(port, &baud, &parity, &bits); |
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return uart_set_options(port, co, baud, parity, bits, flow); |
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} |
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static struct uart_driver grlib_apbuart_driver; |
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static struct console grlib_apbuart_console = { |
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.name = "ttyS", |
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.write = apbuart_console_write, |
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.device = uart_console_device, |
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.setup = apbuart_console_setup, |
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.flags = CON_PRINTBUFFER, |
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.index = -1, |
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.data = &grlib_apbuart_driver, |
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}; |
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static int grlib_apbuart_configure(void); |
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static int __init apbuart_console_init(void) |
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{ |
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if (grlib_apbuart_configure()) |
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return -ENODEV; |
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register_console(&grlib_apbuart_console); |
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return 0; |
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} |
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console_initcall(apbuart_console_init); |
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#define APBUART_CONSOLE (&grlib_apbuart_console) |
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#else |
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#define APBUART_CONSOLE NULL |
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#endif |
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static struct uart_driver grlib_apbuart_driver = { |
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.owner = THIS_MODULE, |
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.driver_name = "serial", |
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.dev_name = "ttyS", |
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.major = SERIAL_APBUART_MAJOR, |
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.minor = SERIAL_APBUART_MINOR, |
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.nr = UART_NR, |
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.cons = APBUART_CONSOLE, |
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}; |
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/* ======================================================================== */ |
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/* OF Platform Driver */ |
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/* ======================================================================== */ |
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static int apbuart_probe(struct platform_device *op) |
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{ |
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int i; |
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struct uart_port *port = NULL; |
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for (i = 0; i < grlib_apbuart_port_nr; i++) { |
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if (op->dev.of_node == grlib_apbuart_nodes[i]) |
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break; |
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} |
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port = &grlib_apbuart_ports[i]; |
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port->dev = &op->dev; |
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port->irq = op->archdata.irqs[0]; |
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uart_add_one_port(&grlib_apbuart_driver, (struct uart_port *) port); |
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apbuart_flush_fifo((struct uart_port *) port); |
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printk(KERN_INFO "grlib-apbuart at 0x%llx, irq %d\n", |
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(unsigned long long) port->mapbase, port->irq); |
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return 0; |
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} |
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static const struct of_device_id apbuart_match[] = { |
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{ |
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.name = "GAISLER_APBUART", |
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}, |
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{ |
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.name = "01_00c", |
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}, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, apbuart_match); |
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static struct platform_driver grlib_apbuart_of_driver = { |
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.probe = apbuart_probe, |
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.driver = { |
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.name = "grlib-apbuart", |
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.of_match_table = apbuart_match, |
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}, |
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}; |
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static int __init grlib_apbuart_configure(void) |
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{ |
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struct device_node *np; |
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int line = 0; |
|
|
|
for_each_matching_node(np, apbuart_match) { |
|
const int *ampopts; |
|
const u32 *freq_hz; |
|
const struct amba_prom_registers *regs; |
|
struct uart_port *port; |
|
unsigned long addr; |
|
|
|
ampopts = of_get_property(np, "ampopts", NULL); |
|
if (ampopts && (*ampopts == 0)) |
|
continue; /* Ignore if used by another OS instance */ |
|
regs = of_get_property(np, "reg", NULL); |
|
/* Frequency of APB Bus is frequency of UART */ |
|
freq_hz = of_get_property(np, "freq", NULL); |
|
|
|
if (!regs || !freq_hz || (*freq_hz == 0)) |
|
continue; |
|
|
|
grlib_apbuart_nodes[line] = np; |
|
|
|
addr = regs->phys_addr; |
|
|
|
port = &grlib_apbuart_ports[line]; |
|
|
|
port->mapbase = addr; |
|
port->membase = ioremap(addr, sizeof(struct grlib_apbuart_regs_map)); |
|
port->irq = 0; |
|
port->iotype = UPIO_MEM; |
|
port->ops = &grlib_apbuart_ops; |
|
port->has_sysrq = IS_ENABLED(CONFIG_SERIAL_GRLIB_GAISLER_APBUART_CONSOLE); |
|
port->flags = UPF_BOOT_AUTOCONF; |
|
port->line = line; |
|
port->uartclk = *freq_hz; |
|
port->fifosize = apbuart_scan_fifo_size((struct uart_port *) port, line); |
|
line++; |
|
|
|
/* We support maximum UART_NR uarts ... */ |
|
if (line == UART_NR) |
|
break; |
|
} |
|
|
|
grlib_apbuart_driver.nr = grlib_apbuart_port_nr = line; |
|
return line ? 0 : -ENODEV; |
|
} |
|
|
|
static int __init grlib_apbuart_init(void) |
|
{ |
|
int ret; |
|
|
|
/* Find all APBUARTS in device the tree and initialize their ports */ |
|
ret = grlib_apbuart_configure(); |
|
if (ret) |
|
return ret; |
|
|
|
printk(KERN_INFO "Serial: GRLIB APBUART driver\n"); |
|
|
|
ret = uart_register_driver(&grlib_apbuart_driver); |
|
|
|
if (ret) { |
|
printk(KERN_ERR "%s: uart_register_driver failed (%i)\n", |
|
__FILE__, ret); |
|
return ret; |
|
} |
|
|
|
ret = platform_driver_register(&grlib_apbuart_of_driver); |
|
if (ret) { |
|
printk(KERN_ERR |
|
"%s: platform_driver_register failed (%i)\n", |
|
__FILE__, ret); |
|
uart_unregister_driver(&grlib_apbuart_driver); |
|
return ret; |
|
} |
|
|
|
return ret; |
|
} |
|
|
|
static void __exit grlib_apbuart_exit(void) |
|
{ |
|
int i; |
|
|
|
for (i = 0; i < grlib_apbuart_port_nr; i++) |
|
uart_remove_one_port(&grlib_apbuart_driver, |
|
&grlib_apbuart_ports[i]); |
|
|
|
uart_unregister_driver(&grlib_apbuart_driver); |
|
platform_driver_unregister(&grlib_apbuart_of_driver); |
|
} |
|
|
|
module_init(grlib_apbuart_init); |
|
module_exit(grlib_apbuart_exit); |
|
|
|
MODULE_AUTHOR("Aeroflex Gaisler AB"); |
|
MODULE_DESCRIPTION("GRLIB APBUART serial driver"); |
|
MODULE_VERSION("2.1"); |
|
MODULE_LICENSE("GPL");
|
|
|