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@@ -1,1551 +0,0 @@
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-// SPDX-License-Identifier: GPL-2.0+
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-/*
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- * Blackfin On-Chip Serial Driver
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- *
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- * Copyright 2006-2011 Analog Devices Inc.
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- *
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- * Enter bugs at http://blackfin.uclinux.org/
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- */
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-
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-#if defined(CONFIG_SERIAL_BFIN_CONSOLE) && defined(CONFIG_MAGIC_SYSRQ)
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-#define SUPPORT_SYSRQ
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-#endif
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-
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-#define DRIVER_NAME "bfin-uart"
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-#define pr_fmt(fmt) DRIVER_NAME ": " fmt
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-
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-#include <linux/module.h>
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-#include <linux/ioport.h>
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-#include <linux/gfp.h>
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-#include <linux/io.h>
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-#include <linux/init.h>
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-#include <linux/console.h>
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-#include <linux/sysrq.h>
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-#include <linux/platform_device.h>
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-#include <linux/tty.h>
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-#include <linux/tty_flip.h>
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-#include <linux/serial_core.h>
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-#include <linux/gpio.h>
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-#include <linux/irq.h>
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-#include <linux/kgdb.h>
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-#include <linux/slab.h>
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-#include <linux/dma-mapping.h>
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-
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-#include <asm/portmux.h>
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-#include <asm/cacheflush.h>
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-#include <asm/dma.h>
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-#include <asm/bfin_serial.h>
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-
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-#ifdef CONFIG_SERIAL_BFIN_MODULE
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-# undef CONFIG_EARLY_PRINTK
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-#endif
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-
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-/* UART name and device definitions */
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-#define BFIN_SERIAL_DEV_NAME "ttyBF"
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-#define BFIN_SERIAL_MAJOR 204
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-#define BFIN_SERIAL_MINOR 64
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-
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-static struct bfin_serial_port *bfin_serial_ports[BFIN_UART_NR_PORTS];
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-
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-#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
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- defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
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-
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-# ifndef CONFIG_SERIAL_BFIN_PIO
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-# error KGDB only support UART in PIO mode.
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-# endif
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-
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-static int kgdboc_port_line;
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-static int kgdboc_break_enabled;
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-#endif
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-/*
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- * Setup for console. Argument comes from the menuconfig
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- */
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-#define DMA_RX_XCOUNT 512
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-#define DMA_RX_YCOUNT (PAGE_SIZE / DMA_RX_XCOUNT)
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-
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-#define DMA_RX_FLUSH_JIFFIES (HZ / 50)
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-
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-#ifdef CONFIG_SERIAL_BFIN_DMA
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-static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart);
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-#else
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-static void bfin_serial_tx_chars(struct bfin_serial_port *uart);
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-#endif
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-
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-static void bfin_serial_reset_irda(struct uart_port *port);
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-
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-#if defined(SERIAL_BFIN_CTSRTS) || \
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- defined(SERIAL_BFIN_HARD_CTSRTS)
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-static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
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-{
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- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
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- if (uart->cts_pin < 0)
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- return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
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-
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- /* CTS PIN is negative assertive. */
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- if (UART_GET_CTS(uart))
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- return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
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- else
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- return TIOCM_DSR | TIOCM_CAR;
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-}
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-
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-static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
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-{
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- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
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- if (uart->rts_pin < 0)
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- return;
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-
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- /* RTS PIN is negative assertive. */
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- if (mctrl & TIOCM_RTS)
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- UART_ENABLE_RTS(uart);
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- else
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- UART_DISABLE_RTS(uart);
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-}
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-
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-/*
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- * Handle any change of modem status signal.
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- */
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-static irqreturn_t bfin_serial_mctrl_cts_int(int irq, void *dev_id)
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-{
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- struct bfin_serial_port *uart = dev_id;
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- struct uart_port *uport = &uart->port;
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- unsigned int status = bfin_serial_get_mctrl(uport);
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-#ifdef SERIAL_BFIN_HARD_CTSRTS
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-
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- UART_CLEAR_SCTS(uart);
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- if (uport->hw_stopped) {
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- if (status) {
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- uport->hw_stopped = 0;
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- uart_write_wakeup(uport);
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- }
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- } else {
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- if (!status)
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- uport->hw_stopped = 1;
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- }
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-#else
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- uart_handle_cts_change(uport, status & TIOCM_CTS);
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-#endif
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-
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- return IRQ_HANDLED;
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-}
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-#else
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-static unsigned int bfin_serial_get_mctrl(struct uart_port *port)
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-{
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- return TIOCM_CTS | TIOCM_DSR | TIOCM_CAR;
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-}
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-
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-static void bfin_serial_set_mctrl(struct uart_port *port, unsigned int mctrl)
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-{
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-}
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-#endif
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-
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-/*
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- * interrupts are disabled on entry
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- */
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-static void bfin_serial_stop_tx(struct uart_port *port)
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-{
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- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
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-#ifdef CONFIG_SERIAL_BFIN_DMA
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- struct circ_buf *xmit = &uart->port.state->xmit;
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-#endif
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-
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- while (!(UART_GET_LSR(uart) & TEMT))
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- cpu_relax();
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-
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-#ifdef CONFIG_SERIAL_BFIN_DMA
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- disable_dma(uart->tx_dma_channel);
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- xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
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- uart->port.icount.tx += uart->tx_count;
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- uart->tx_count = 0;
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- uart->tx_done = 1;
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-#else
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-#if defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
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- /* Clear TFI bit */
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- UART_PUT_LSR(uart, TFI);
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-#endif
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- UART_CLEAR_IER(uart, ETBEI);
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-#endif
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-}
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-
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-/*
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- * port is locked and interrupts are disabled
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- */
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-static void bfin_serial_start_tx(struct uart_port *port)
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-{
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- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
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- struct tty_struct *tty = uart->port.state->port.tty;
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-
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- /*
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- * To avoid losting RX interrupt, we reset IR function
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- * before sending data.
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- */
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- if (tty->termios.c_line == N_IRDA)
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- bfin_serial_reset_irda(port);
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-
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-#ifdef CONFIG_SERIAL_BFIN_DMA
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- if (uart->tx_done)
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- bfin_serial_dma_tx_chars(uart);
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-#else
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- UART_SET_IER(uart, ETBEI);
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- bfin_serial_tx_chars(uart);
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-#endif
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-}
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-
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-/*
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- * Interrupts are enabled
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- */
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-static void bfin_serial_stop_rx(struct uart_port *port)
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-{
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- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
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-
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- UART_CLEAR_IER(uart, ERBFI);
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-}
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-
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-#if ANOMALY_05000363 && defined(CONFIG_SERIAL_BFIN_PIO)
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-# define UART_GET_ANOMALY_THRESHOLD(uart) ((uart)->anomaly_threshold)
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-# define UART_SET_ANOMALY_THRESHOLD(uart, v) ((uart)->anomaly_threshold = (v))
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-#else
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-# define UART_GET_ANOMALY_THRESHOLD(uart) 0
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-# define UART_SET_ANOMALY_THRESHOLD(uart, v)
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-#endif
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-
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-#ifdef CONFIG_SERIAL_BFIN_PIO
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-static void bfin_serial_rx_chars(struct bfin_serial_port *uart)
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-{
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- unsigned int status, ch, flg;
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- static u64 anomaly_start;
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-
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- status = UART_GET_LSR(uart);
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- UART_CLEAR_LSR(uart);
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-
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- ch = UART_GET_CHAR(uart);
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- uart->port.icount.rx++;
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-
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-#if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
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- defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
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- if (kgdb_connected && kgdboc_port_line == uart->port.line
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- && kgdboc_break_enabled)
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- if (ch == 0x3) {/* Ctrl + C */
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- kgdb_breakpoint();
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- return;
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- }
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-
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- if (!uart->port.state)
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- return;
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-#endif
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- if (ANOMALY_05000363) {
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- /* The BF533 (and BF561) family of processors have a nice anomaly
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- * where they continuously generate characters for a "single" break.
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- * We have to basically ignore this flood until the "next" valid
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- * character comes across. Due to the nature of the flood, it is
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- * not possible to reliably catch bytes that are sent too quickly
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- * after this break. So application code talking to the Blackfin
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- * which sends a break signal must allow at least 1.5 character
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- * times after the end of the break for things to stabilize. This
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- * timeout was picked as it must absolutely be larger than 1
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- * character time +/- some percent. So 1.5 sounds good. All other
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- * Blackfin families operate properly. Woo.
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- */
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- if (anomaly_start > 0) {
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- u64 curr, nsecs, threshold_ns;
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-
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- if ((~ch & (~ch + 1)) & 0xff)
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- goto known_good_char;
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-
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- curr = ktime_get_ns();
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- nsecs = curr - anomaly_start;
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- if (nsecs >> 32)
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- goto known_good_char;
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-
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- threshold_ns = UART_GET_ANOMALY_THRESHOLD(uart)
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- * NSEC_PER_USEC;
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- if (nsecs > threshold_ns)
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- goto known_good_char;
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-
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- if (ch)
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- anomaly_start = 0;
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- else
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- anomaly_start = curr;
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-
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- return;
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-
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- known_good_char:
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- status &= ~BI;
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- anomaly_start = 0;
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- }
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- }
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-
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- if (status & BI) {
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- if (ANOMALY_05000363)
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- if (bfin_revid() < 5)
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- anomaly_start = ktime_get_ns();
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- uart->port.icount.brk++;
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- if (uart_handle_break(&uart->port))
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- goto ignore_char;
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- status &= ~(PE | FE);
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- }
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- if (status & PE)
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- uart->port.icount.parity++;
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- if (status & OE)
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- uart->port.icount.overrun++;
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- if (status & FE)
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- uart->port.icount.frame++;
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-
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- status &= uart->port.read_status_mask;
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-
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- if (status & BI)
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- flg = TTY_BREAK;
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- else if (status & PE)
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- flg = TTY_PARITY;
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- else if (status & FE)
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- flg = TTY_FRAME;
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- else
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- flg = TTY_NORMAL;
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-
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- if (uart_handle_sysrq_char(&uart->port, ch))
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- goto ignore_char;
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-
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- uart_insert_char(&uart->port, status, OE, ch, flg);
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-
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- ignore_char:
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- tty_flip_buffer_push(&uart->port.state->port);
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-}
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-
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-static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
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-{
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- struct circ_buf *xmit = &uart->port.state->xmit;
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-
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- if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
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-#if defined(CONFIG_BF54x) || defined(CONFIG_BF60x)
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- /* Clear TFI bit */
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- UART_PUT_LSR(uart, TFI);
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-#endif
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- /* Anomaly notes:
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- * 05000215 - we always clear ETBEI within last UART TX
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- * interrupt to end a string. It is always set
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- * when start a new tx.
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- */
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- UART_CLEAR_IER(uart, ETBEI);
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- return;
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- }
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-
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- if (uart->port.x_char) {
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- UART_PUT_CHAR(uart, uart->port.x_char);
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- uart->port.icount.tx++;
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- uart->port.x_char = 0;
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- }
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-
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- while ((UART_GET_LSR(uart) & THRE) && xmit->tail != xmit->head) {
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- UART_PUT_CHAR(uart, xmit->buf[xmit->tail]);
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- xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
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- uart->port.icount.tx++;
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- }
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-
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- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
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- uart_write_wakeup(&uart->port);
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-}
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-
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-static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
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-{
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- struct bfin_serial_port *uart = dev_id;
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-
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- while (UART_GET_LSR(uart) & DR)
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- bfin_serial_rx_chars(uart);
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-
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- return IRQ_HANDLED;
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-}
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-
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-static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
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-{
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- struct bfin_serial_port *uart = dev_id;
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-
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- spin_lock(&uart->port.lock);
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- if (UART_GET_LSR(uart) & THRE)
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- bfin_serial_tx_chars(uart);
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- spin_unlock(&uart->port.lock);
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-
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- return IRQ_HANDLED;
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-}
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-#endif
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-
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-#ifdef CONFIG_SERIAL_BFIN_DMA
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-static void bfin_serial_dma_tx_chars(struct bfin_serial_port *uart)
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-{
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- struct circ_buf *xmit = &uart->port.state->xmit;
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-
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- uart->tx_done = 0;
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-
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- if (uart_circ_empty(xmit) || uart_tx_stopped(&uart->port)) {
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- uart->tx_count = 0;
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- uart->tx_done = 1;
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- return;
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- }
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-
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- if (uart->port.x_char) {
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- UART_PUT_CHAR(uart, uart->port.x_char);
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- uart->port.icount.tx++;
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- uart->port.x_char = 0;
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- }
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-
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- uart->tx_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
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- if (uart->tx_count > (UART_XMIT_SIZE - xmit->tail))
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- uart->tx_count = UART_XMIT_SIZE - xmit->tail;
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- blackfin_dcache_flush_range((unsigned long)(xmit->buf+xmit->tail),
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- (unsigned long)(xmit->buf+xmit->tail+uart->tx_count));
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- set_dma_config(uart->tx_dma_channel,
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- set_bfin_dma_config(DIR_READ, DMA_FLOW_STOP,
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- INTR_ON_BUF,
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- DIMENSION_LINEAR,
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- DATA_SIZE_8,
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- DMA_SYNC_RESTART));
|
|
|
- set_dma_start_addr(uart->tx_dma_channel, (unsigned long)(xmit->buf+xmit->tail));
|
|
|
- set_dma_x_count(uart->tx_dma_channel, uart->tx_count);
|
|
|
- set_dma_x_modify(uart->tx_dma_channel, 1);
|
|
|
- SSYNC();
|
|
|
- enable_dma(uart->tx_dma_channel);
|
|
|
-
|
|
|
- UART_SET_IER(uart, ETBEI);
|
|
|
-}
|
|
|
-
|
|
|
-static void bfin_serial_dma_rx_chars(struct bfin_serial_port *uart)
|
|
|
-{
|
|
|
- int i, flg, status;
|
|
|
-
|
|
|
- status = UART_GET_LSR(uart);
|
|
|
- UART_CLEAR_LSR(uart);
|
|
|
-
|
|
|
- uart->port.icount.rx +=
|
|
|
- CIRC_CNT(uart->rx_dma_buf.head, uart->rx_dma_buf.tail,
|
|
|
- UART_XMIT_SIZE);
|
|
|
-
|
|
|
- if (status & BI) {
|
|
|
- uart->port.icount.brk++;
|
|
|
- if (uart_handle_break(&uart->port))
|
|
|
- goto dma_ignore_char;
|
|
|
- status &= ~(PE | FE);
|
|
|
- }
|
|
|
- if (status & PE)
|
|
|
- uart->port.icount.parity++;
|
|
|
- if (status & OE)
|
|
|
- uart->port.icount.overrun++;
|
|
|
- if (status & FE)
|
|
|
- uart->port.icount.frame++;
|
|
|
-
|
|
|
- status &= uart->port.read_status_mask;
|
|
|
-
|
|
|
- if (status & BI)
|
|
|
- flg = TTY_BREAK;
|
|
|
- else if (status & PE)
|
|
|
- flg = TTY_PARITY;
|
|
|
- else if (status & FE)
|
|
|
- flg = TTY_FRAME;
|
|
|
- else
|
|
|
- flg = TTY_NORMAL;
|
|
|
-
|
|
|
- for (i = uart->rx_dma_buf.tail; ; i++) {
|
|
|
- if (i >= UART_XMIT_SIZE)
|
|
|
- i = 0;
|
|
|
- if (i == uart->rx_dma_buf.head)
|
|
|
- break;
|
|
|
- if (!uart_handle_sysrq_char(&uart->port, uart->rx_dma_buf.buf[i]))
|
|
|
- uart_insert_char(&uart->port, status, OE,
|
|
|
- uart->rx_dma_buf.buf[i], flg);
|
|
|
- }
|
|
|
-
|
|
|
- dma_ignore_char:
|
|
|
- tty_flip_buffer_push(&uart->port.state->port);
|
|
|
-}
|
|
|
-
|
|
|
-void bfin_serial_rx_dma_timeout(struct timer_list *t)
|
|
|
-{
|
|
|
- struct bfin_serial_port *uart = from_timer(uart, t, rx_dma_timer);
|
|
|
- int x_pos, pos;
|
|
|
- unsigned long flags;
|
|
|
-
|
|
|
- dma_disable_irq_nosync(uart->rx_dma_channel);
|
|
|
- spin_lock_irqsave(&uart->rx_lock, flags);
|
|
|
-
|
|
|
- /* 2D DMA RX buffer ring is used. Because curr_y_count and
|
|
|
- * curr_x_count can't be read as an atomic operation,
|
|
|
- * curr_y_count should be read before curr_x_count. When
|
|
|
- * curr_x_count is read, curr_y_count may already indicate
|
|
|
- * next buffer line. But, the position calculated here is
|
|
|
- * still indicate the old line. The wrong position data may
|
|
|
- * be smaller than current buffer tail, which cause garbages
|
|
|
- * are received if it is not prohibit.
|
|
|
- */
|
|
|
- uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
|
|
|
- x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
|
|
|
- uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
|
|
|
- if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
|
|
|
- uart->rx_dma_nrows = 0;
|
|
|
- x_pos = DMA_RX_XCOUNT - x_pos;
|
|
|
- if (x_pos == DMA_RX_XCOUNT)
|
|
|
- x_pos = 0;
|
|
|
-
|
|
|
- pos = uart->rx_dma_nrows * DMA_RX_XCOUNT + x_pos;
|
|
|
- /* Ignore receiving data if new position is in the same line of
|
|
|
- * current buffer tail and small.
|
|
|
- */
|
|
|
- if (pos > uart->rx_dma_buf.tail ||
|
|
|
- uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
|
|
|
- uart->rx_dma_buf.head = pos;
|
|
|
- bfin_serial_dma_rx_chars(uart);
|
|
|
- uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
|
|
|
- }
|
|
|
-
|
|
|
- spin_unlock_irqrestore(&uart->rx_lock, flags);
|
|
|
- dma_enable_irq(uart->rx_dma_channel);
|
|
|
-
|
|
|
- mod_timer(&(uart->rx_dma_timer), jiffies + DMA_RX_FLUSH_JIFFIES);
|
|
|
-}
|
|
|
-
|
|
|
-static irqreturn_t bfin_serial_dma_tx_int(int irq, void *dev_id)
|
|
|
-{
|
|
|
- struct bfin_serial_port *uart = dev_id;
|
|
|
- struct circ_buf *xmit = &uart->port.state->xmit;
|
|
|
-
|
|
|
- spin_lock(&uart->port.lock);
|
|
|
- if (!(get_dma_curr_irqstat(uart->tx_dma_channel)&DMA_RUN)) {
|
|
|
- disable_dma(uart->tx_dma_channel);
|
|
|
- clear_dma_irqstat(uart->tx_dma_channel);
|
|
|
- /* Anomaly notes:
|
|
|
- * 05000215 - we always clear ETBEI within last UART TX
|
|
|
- * interrupt to end a string. It is always set
|
|
|
- * when start a new tx.
|
|
|
- */
|
|
|
- UART_CLEAR_IER(uart, ETBEI);
|
|
|
- uart->port.icount.tx += uart->tx_count;
|
|
|
- if (!(xmit->tail == 0 && xmit->head == 0)) {
|
|
|
- xmit->tail = (xmit->tail + uart->tx_count) & (UART_XMIT_SIZE - 1);
|
|
|
-
|
|
|
- if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
|
|
|
- uart_write_wakeup(&uart->port);
|
|
|
- }
|
|
|
-
|
|
|
- bfin_serial_dma_tx_chars(uart);
|
|
|
- }
|
|
|
-
|
|
|
- spin_unlock(&uart->port.lock);
|
|
|
- return IRQ_HANDLED;
|
|
|
-}
|
|
|
-
|
|
|
-static irqreturn_t bfin_serial_dma_rx_int(int irq, void *dev_id)
|
|
|
-{
|
|
|
- struct bfin_serial_port *uart = dev_id;
|
|
|
- unsigned int irqstat;
|
|
|
- int x_pos, pos;
|
|
|
-
|
|
|
- spin_lock(&uart->rx_lock);
|
|
|
- irqstat = get_dma_curr_irqstat(uart->rx_dma_channel);
|
|
|
- clear_dma_irqstat(uart->rx_dma_channel);
|
|
|
-
|
|
|
- uart->rx_dma_nrows = get_dma_curr_ycount(uart->rx_dma_channel);
|
|
|
- x_pos = get_dma_curr_xcount(uart->rx_dma_channel);
|
|
|
- uart->rx_dma_nrows = DMA_RX_YCOUNT - uart->rx_dma_nrows;
|
|
|
- if (uart->rx_dma_nrows == DMA_RX_YCOUNT || x_pos == 0)
|
|
|
- uart->rx_dma_nrows = 0;
|
|
|
-
|
|
|
- pos = uart->rx_dma_nrows * DMA_RX_XCOUNT;
|
|
|
- if (pos > uart->rx_dma_buf.tail ||
|
|
|
- uart->rx_dma_nrows < (uart->rx_dma_buf.tail/DMA_RX_XCOUNT)) {
|
|
|
- uart->rx_dma_buf.head = pos;
|
|
|
- bfin_serial_dma_rx_chars(uart);
|
|
|
- uart->rx_dma_buf.tail = uart->rx_dma_buf.head;
|
|
|
- }
|
|
|
-
|
|
|
- spin_unlock(&uart->rx_lock);
|
|
|
-
|
|
|
- return IRQ_HANDLED;
|
|
|
-}
|
|
|
-#endif
|
|
|
-
|
|
|
-/*
|
|
|
- * Return TIOCSER_TEMT when transmitter is not busy.
|
|
|
- */
|
|
|
-static unsigned int bfin_serial_tx_empty(struct uart_port *port)
|
|
|
-{
|
|
|
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
|
|
|
- unsigned int lsr;
|
|
|
-
|
|
|
- lsr = UART_GET_LSR(uart);
|
|
|
- if (lsr & TEMT)
|
|
|
- return TIOCSER_TEMT;
|
|
|
- else
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-static void bfin_serial_break_ctl(struct uart_port *port, int break_state)
|
|
|
-{
|
|
|
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
|
|
|
- u32 lcr = UART_GET_LCR(uart);
|
|
|
- if (break_state)
|
|
|
- lcr |= SB;
|
|
|
- else
|
|
|
- lcr &= ~SB;
|
|
|
- UART_PUT_LCR(uart, lcr);
|
|
|
- SSYNC();
|
|
|
-}
|
|
|
-
|
|
|
-static int bfin_serial_startup(struct uart_port *port)
|
|
|
-{
|
|
|
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
|
|
|
-
|
|
|
-#ifdef CONFIG_SERIAL_BFIN_DMA
|
|
|
- dma_addr_t dma_handle;
|
|
|
-
|
|
|
- if (request_dma(uart->rx_dma_channel, "BFIN_UART_RX") < 0) {
|
|
|
- printk(KERN_NOTICE "Unable to attach Blackfin UART RX DMA channel\n");
|
|
|
- return -EBUSY;
|
|
|
- }
|
|
|
-
|
|
|
- if (request_dma(uart->tx_dma_channel, "BFIN_UART_TX") < 0) {
|
|
|
- printk(KERN_NOTICE "Unable to attach Blackfin UART TX DMA channel\n");
|
|
|
- free_dma(uart->rx_dma_channel);
|
|
|
- return -EBUSY;
|
|
|
- }
|
|
|
-
|
|
|
- set_dma_callback(uart->rx_dma_channel, bfin_serial_dma_rx_int, uart);
|
|
|
- set_dma_callback(uart->tx_dma_channel, bfin_serial_dma_tx_int, uart);
|
|
|
-
|
|
|
- uart->rx_dma_buf.buf = (unsigned char *)dma_alloc_coherent(NULL, PAGE_SIZE, &dma_handle, GFP_DMA);
|
|
|
- uart->rx_dma_buf.head = 0;
|
|
|
- uart->rx_dma_buf.tail = 0;
|
|
|
- uart->rx_dma_nrows = 0;
|
|
|
-
|
|
|
- set_dma_config(uart->rx_dma_channel,
|
|
|
- set_bfin_dma_config(DIR_WRITE, DMA_FLOW_AUTO,
|
|
|
- INTR_ON_ROW, DIMENSION_2D,
|
|
|
- DATA_SIZE_8,
|
|
|
- DMA_SYNC_RESTART));
|
|
|
- set_dma_x_count(uart->rx_dma_channel, DMA_RX_XCOUNT);
|
|
|
- set_dma_x_modify(uart->rx_dma_channel, 1);
|
|
|
- set_dma_y_count(uart->rx_dma_channel, DMA_RX_YCOUNT);
|
|
|
- set_dma_y_modify(uart->rx_dma_channel, 1);
|
|
|
- set_dma_start_addr(uart->rx_dma_channel, (unsigned long)uart->rx_dma_buf.buf);
|
|
|
- enable_dma(uart->rx_dma_channel);
|
|
|
-
|
|
|
- uart->rx_dma_timer.expires = jiffies + DMA_RX_FLUSH_JIFFIES;
|
|
|
- add_timer(&(uart->rx_dma_timer));
|
|
|
-#else
|
|
|
-# if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
|
|
|
- defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
|
|
|
- if (kgdboc_port_line == uart->port.line && kgdboc_break_enabled)
|
|
|
- kgdboc_break_enabled = 0;
|
|
|
- else {
|
|
|
-# endif
|
|
|
- if (request_irq(uart->rx_irq, bfin_serial_rx_int, 0,
|
|
|
- "BFIN_UART_RX", uart)) {
|
|
|
- printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
|
|
|
- return -EBUSY;
|
|
|
- }
|
|
|
-
|
|
|
- if (request_irq
|
|
|
- (uart->tx_irq, bfin_serial_tx_int, 0,
|
|
|
- "BFIN_UART_TX", uart)) {
|
|
|
- printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
|
|
|
- free_irq(uart->rx_irq, uart);
|
|
|
- return -EBUSY;
|
|
|
- }
|
|
|
-
|
|
|
-# ifdef CONFIG_BF54x
|
|
|
- {
|
|
|
- /*
|
|
|
- * UART2 and UART3 on BF548 share interrupt PINs and DMA
|
|
|
- * controllers with SPORT2 and SPORT3. UART rx and tx
|
|
|
- * interrupts are generated in PIO mode only when configure
|
|
|
- * their peripheral mapping registers properly, which means
|
|
|
- * request corresponding DMA channels in PIO mode as well.
|
|
|
- */
|
|
|
- unsigned uart_dma_ch_rx, uart_dma_ch_tx;
|
|
|
-
|
|
|
- switch (uart->rx_irq) {
|
|
|
- case IRQ_UART3_RX:
|
|
|
- uart_dma_ch_rx = CH_UART3_RX;
|
|
|
- uart_dma_ch_tx = CH_UART3_TX;
|
|
|
- break;
|
|
|
- case IRQ_UART2_RX:
|
|
|
- uart_dma_ch_rx = CH_UART2_RX;
|
|
|
- uart_dma_ch_tx = CH_UART2_TX;
|
|
|
- break;
|
|
|
- default:
|
|
|
- uart_dma_ch_rx = uart_dma_ch_tx = 0;
|
|
|
- break;
|
|
|
- }
|
|
|
-
|
|
|
- if (uart_dma_ch_rx &&
|
|
|
- request_dma(uart_dma_ch_rx, "BFIN_UART_RX") < 0) {
|
|
|
- printk(KERN_NOTICE"Fail to attach UART interrupt\n");
|
|
|
- free_irq(uart->rx_irq, uart);
|
|
|
- free_irq(uart->tx_irq, uart);
|
|
|
- return -EBUSY;
|
|
|
- }
|
|
|
- if (uart_dma_ch_tx &&
|
|
|
- request_dma(uart_dma_ch_tx, "BFIN_UART_TX") < 0) {
|
|
|
- printk(KERN_NOTICE "Fail to attach UART interrupt\n");
|
|
|
- free_dma(uart_dma_ch_rx);
|
|
|
- free_irq(uart->rx_irq, uart);
|
|
|
- free_irq(uart->tx_irq, uart);
|
|
|
- return -EBUSY;
|
|
|
- }
|
|
|
- }
|
|
|
-# endif
|
|
|
-# if defined(CONFIG_KGDB_SERIAL_CONSOLE) || \
|
|
|
- defined(CONFIG_KGDB_SERIAL_CONSOLE_MODULE)
|
|
|
- }
|
|
|
-# endif
|
|
|
-#endif
|
|
|
-
|
|
|
-#ifdef SERIAL_BFIN_CTSRTS
|
|
|
- if (uart->cts_pin >= 0) {
|
|
|
- if (request_irq(gpio_to_irq(uart->cts_pin),
|
|
|
- bfin_serial_mctrl_cts_int,
|
|
|
- IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING |
|
|
|
- 0, "BFIN_UART_CTS", uart)) {
|
|
|
- uart->cts_pin = -1;
|
|
|
- pr_info("Unable to attach BlackFin UART CTS interrupt. So, disable it.\n");
|
|
|
- }
|
|
|
- }
|
|
|
- if (uart->rts_pin >= 0) {
|
|
|
- if (gpio_request(uart->rts_pin, DRIVER_NAME)) {
|
|
|
- pr_info("fail to request RTS PIN at GPIO_%d\n", uart->rts_pin);
|
|
|
- uart->rts_pin = -1;
|
|
|
- } else
|
|
|
- gpio_direction_output(uart->rts_pin, 0);
|
|
|
- }
|
|
|
-#endif
|
|
|
-#ifdef SERIAL_BFIN_HARD_CTSRTS
|
|
|
- if (uart->cts_pin >= 0) {
|
|
|
- if (request_irq(uart->status_irq, bfin_serial_mctrl_cts_int,
|
|
|
- 0, "BFIN_UART_MODEM_STATUS", uart)) {
|
|
|
- uart->cts_pin = -1;
|
|
|
- dev_info(port->dev, "Unable to attach BlackFin UART Modem Status interrupt.\n");
|
|
|
- }
|
|
|
-
|
|
|
- /* CTS RTS PINs are negative assertive. */
|
|
|
- UART_PUT_MCR(uart, UART_GET_MCR(uart) | ACTS);
|
|
|
- UART_SET_IER(uart, EDSSI);
|
|
|
- }
|
|
|
-#endif
|
|
|
-
|
|
|
- UART_SET_IER(uart, ERBFI);
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-static void bfin_serial_shutdown(struct uart_port *port)
|
|
|
-{
|
|
|
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
|
|
|
-
|
|
|
-#ifdef CONFIG_SERIAL_BFIN_DMA
|
|
|
- disable_dma(uart->tx_dma_channel);
|
|
|
- free_dma(uart->tx_dma_channel);
|
|
|
- disable_dma(uart->rx_dma_channel);
|
|
|
- free_dma(uart->rx_dma_channel);
|
|
|
- del_timer(&(uart->rx_dma_timer));
|
|
|
- dma_free_coherent(NULL, PAGE_SIZE, uart->rx_dma_buf.buf, 0);
|
|
|
-#else
|
|
|
-#ifdef CONFIG_BF54x
|
|
|
- switch (uart->port.irq) {
|
|
|
- case IRQ_UART3_RX:
|
|
|
- free_dma(CH_UART3_RX);
|
|
|
- free_dma(CH_UART3_TX);
|
|
|
- break;
|
|
|
- case IRQ_UART2_RX:
|
|
|
- free_dma(CH_UART2_RX);
|
|
|
- free_dma(CH_UART2_TX);
|
|
|
- break;
|
|
|
- default:
|
|
|
- break;
|
|
|
- }
|
|
|
-#endif
|
|
|
- free_irq(uart->rx_irq, uart);
|
|
|
- free_irq(uart->tx_irq, uart);
|
|
|
-#endif
|
|
|
-
|
|
|
-#ifdef SERIAL_BFIN_CTSRTS
|
|
|
- if (uart->cts_pin >= 0)
|
|
|
- free_irq(gpio_to_irq(uart->cts_pin), uart);
|
|
|
- if (uart->rts_pin >= 0)
|
|
|
- gpio_free(uart->rts_pin);
|
|
|
-#endif
|
|
|
-#ifdef SERIAL_BFIN_HARD_CTSRTS
|
|
|
- if (uart->cts_pin >= 0)
|
|
|
- free_irq(uart->status_irq, uart);
|
|
|
-#endif
|
|
|
-}
|
|
|
-
|
|
|
-static void
|
|
|
-bfin_serial_set_termios(struct uart_port *port, struct ktermios *termios,
|
|
|
- struct ktermios *old)
|
|
|
-{
|
|
|
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
|
|
|
- unsigned long flags;
|
|
|
- unsigned int baud, quot;
|
|
|
- unsigned int ier, lcr = 0;
|
|
|
- unsigned long timeout;
|
|
|
-
|
|
|
-#ifdef SERIAL_BFIN_CTSRTS
|
|
|
- if (old == NULL && uart->cts_pin != -1)
|
|
|
- termios->c_cflag |= CRTSCTS;
|
|
|
- else if (uart->cts_pin == -1)
|
|
|
- termios->c_cflag &= ~CRTSCTS;
|
|
|
-#endif
|
|
|
-
|
|
|
- switch (termios->c_cflag & CSIZE) {
|
|
|
- case CS8:
|
|
|
- lcr = WLS(8);
|
|
|
- break;
|
|
|
- case CS7:
|
|
|
- lcr = WLS(7);
|
|
|
- break;
|
|
|
- case CS6:
|
|
|
- lcr = WLS(6);
|
|
|
- break;
|
|
|
- case CS5:
|
|
|
- lcr = WLS(5);
|
|
|
- break;
|
|
|
- default:
|
|
|
- printk(KERN_ERR "%s: word length not supported\n",
|
|
|
- __func__);
|
|
|
- }
|
|
|
-
|
|
|
- /* Anomaly notes:
|
|
|
- * 05000231 - STOP bit is always set to 1 whatever the user is set.
|
|
|
- */
|
|
|
- if (termios->c_cflag & CSTOPB) {
|
|
|
- if (ANOMALY_05000231)
|
|
|
- printk(KERN_WARNING "STOP bits other than 1 is not "
|
|
|
- "supported in case of anomaly 05000231.\n");
|
|
|
- else
|
|
|
- lcr |= STB;
|
|
|
- }
|
|
|
- if (termios->c_cflag & PARENB)
|
|
|
- lcr |= PEN;
|
|
|
- if (!(termios->c_cflag & PARODD))
|
|
|
- lcr |= EPS;
|
|
|
- if (termios->c_cflag & CMSPAR)
|
|
|
- lcr |= STP;
|
|
|
-
|
|
|
- spin_lock_irqsave(&uart->port.lock, flags);
|
|
|
-
|
|
|
- port->read_status_mask = OE;
|
|
|
- if (termios->c_iflag & INPCK)
|
|
|
- port->read_status_mask |= (FE | PE);
|
|
|
- if (termios->c_iflag & (IGNBRK | BRKINT | PARMRK))
|
|
|
- port->read_status_mask |= BI;
|
|
|
-
|
|
|
- /*
|
|
|
- * Characters to ignore
|
|
|
- */
|
|
|
- port->ignore_status_mask = 0;
|
|
|
- if (termios->c_iflag & IGNPAR)
|
|
|
- port->ignore_status_mask |= FE | PE;
|
|
|
- if (termios->c_iflag & IGNBRK) {
|
|
|
- port->ignore_status_mask |= BI;
|
|
|
- /*
|
|
|
- * If we're ignoring parity and break indicators,
|
|
|
- * ignore overruns too (for real raw support).
|
|
|
- */
|
|
|
- if (termios->c_iflag & IGNPAR)
|
|
|
- port->ignore_status_mask |= OE;
|
|
|
- }
|
|
|
-
|
|
|
- baud = uart_get_baud_rate(port, termios, old, 0, port->uartclk/16);
|
|
|
- quot = uart_get_divisor(port, baud);
|
|
|
-
|
|
|
- /* If discipline is not IRDA, apply ANOMALY_05000230 */
|
|
|
- if (termios->c_line != N_IRDA)
|
|
|
- quot -= ANOMALY_05000230;
|
|
|
-
|
|
|
- UART_SET_ANOMALY_THRESHOLD(uart, USEC_PER_SEC / baud * 15);
|
|
|
-
|
|
|
- /* Wait till the transfer buffer is empty */
|
|
|
- timeout = jiffies + msecs_to_jiffies(10);
|
|
|
- while (UART_GET_GCTL(uart) & UCEN && !(UART_GET_LSR(uart) & TEMT))
|
|
|
- if (time_after(jiffies, timeout)) {
|
|
|
- dev_warn(port->dev, "timeout waiting for TX buffer empty\n");
|
|
|
- break;
|
|
|
- }
|
|
|
-
|
|
|
- /* Disable UART */
|
|
|
- ier = UART_GET_IER(uart);
|
|
|
- UART_PUT_GCTL(uart, UART_GET_GCTL(uart) & ~UCEN);
|
|
|
- UART_DISABLE_INTS(uart);
|
|
|
-
|
|
|
- /* Set DLAB in LCR to Access CLK */
|
|
|
- UART_SET_DLAB(uart);
|
|
|
-
|
|
|
- UART_PUT_CLK(uart, quot);
|
|
|
- SSYNC();
|
|
|
-
|
|
|
- /* Clear DLAB in LCR to Access THR RBR IER */
|
|
|
- UART_CLEAR_DLAB(uart);
|
|
|
-
|
|
|
- UART_PUT_LCR(uart, (UART_GET_LCR(uart) & ~LCR_MASK) | lcr);
|
|
|
-
|
|
|
- /* Enable UART */
|
|
|
- UART_ENABLE_INTS(uart, ier);
|
|
|
- UART_PUT_GCTL(uart, UART_GET_GCTL(uart) | UCEN);
|
|
|
-
|
|
|
- /* Port speed changed, update the per-port timeout. */
|
|
|
- uart_update_timeout(port, termios->c_cflag, baud);
|
|
|
-
|
|
|
- spin_unlock_irqrestore(&uart->port.lock, flags);
|
|
|
-}
|
|
|
-
|
|
|
-static const char *bfin_serial_type(struct uart_port *port)
|
|
|
-{
|
|
|
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
|
|
|
-
|
|
|
- return uart->port.type == PORT_BFIN ? "BFIN-UART" : NULL;
|
|
|
-}
|
|
|
-
|
|
|
-/*
|
|
|
- * Release the memory region(s) being used by 'port'.
|
|
|
- */
|
|
|
-static void bfin_serial_release_port(struct uart_port *port)
|
|
|
-{
|
|
|
-}
|
|
|
-
|
|
|
-/*
|
|
|
- * Request the memory region(s) being used by 'port'.
|
|
|
- */
|
|
|
-static int bfin_serial_request_port(struct uart_port *port)
|
|
|
-{
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-/*
|
|
|
- * Configure/autoconfigure the port.
|
|
|
- */
|
|
|
-static void bfin_serial_config_port(struct uart_port *port, int flags)
|
|
|
-{
|
|
|
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
|
|
|
-
|
|
|
- if (flags & UART_CONFIG_TYPE &&
|
|
|
- bfin_serial_request_port(&uart->port) == 0)
|
|
|
- uart->port.type = PORT_BFIN;
|
|
|
-}
|
|
|
-
|
|
|
-/*
|
|
|
- * Verify the new serial_struct (for TIOCSSERIAL).
|
|
|
- * The only change we allow are to the flags and type, and
|
|
|
- * even then only between PORT_BFIN and PORT_UNKNOWN
|
|
|
- */
|
|
|
-static int
|
|
|
-bfin_serial_verify_port(struct uart_port *port, struct serial_struct *ser)
|
|
|
-{
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-/*
|
|
|
- * Enable the IrDA function if tty->ldisc.num is N_IRDA.
|
|
|
- * In other cases, disable IrDA function.
|
|
|
- */
|
|
|
-static void bfin_serial_set_ldisc(struct uart_port *port,
|
|
|
- struct ktermios *termios)
|
|
|
-{
|
|
|
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
|
|
|
- unsigned int val;
|
|
|
-
|
|
|
- switch (termios->c_line) {
|
|
|
- case N_IRDA:
|
|
|
- val = UART_GET_GCTL(uart);
|
|
|
- val |= (UMOD_IRDA | RPOLC);
|
|
|
- UART_PUT_GCTL(uart, val);
|
|
|
- break;
|
|
|
- default:
|
|
|
- val = UART_GET_GCTL(uart);
|
|
|
- val &= ~(UMOD_MASK | RPOLC);
|
|
|
- UART_PUT_GCTL(uart, val);
|
|
|
- }
|
|
|
-}
|
|
|
-
|
|
|
-static void bfin_serial_reset_irda(struct uart_port *port)
|
|
|
-{
|
|
|
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
|
|
|
- unsigned int val;
|
|
|
-
|
|
|
- val = UART_GET_GCTL(uart);
|
|
|
- val &= ~(UMOD_MASK | RPOLC);
|
|
|
- UART_PUT_GCTL(uart, val);
|
|
|
- SSYNC();
|
|
|
- val |= (UMOD_IRDA | RPOLC);
|
|
|
- UART_PUT_GCTL(uart, val);
|
|
|
- SSYNC();
|
|
|
-}
|
|
|
-
|
|
|
-#ifdef CONFIG_CONSOLE_POLL
|
|
|
-/* Anomaly notes:
|
|
|
- * 05000099 - Because we only use THRE in poll_put and DR in poll_get,
|
|
|
- * losing other bits of UART_LSR is not a problem here.
|
|
|
- */
|
|
|
-static void bfin_serial_poll_put_char(struct uart_port *port, unsigned char chr)
|
|
|
-{
|
|
|
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
|
|
|
-
|
|
|
- while (!(UART_GET_LSR(uart) & THRE))
|
|
|
- cpu_relax();
|
|
|
-
|
|
|
- UART_CLEAR_DLAB(uart);
|
|
|
- UART_PUT_CHAR(uart, (unsigned char)chr);
|
|
|
-}
|
|
|
-
|
|
|
-static int bfin_serial_poll_get_char(struct uart_port *port)
|
|
|
-{
|
|
|
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
|
|
|
- unsigned char chr;
|
|
|
-
|
|
|
- while (!(UART_GET_LSR(uart) & DR))
|
|
|
- cpu_relax();
|
|
|
-
|
|
|
- UART_CLEAR_DLAB(uart);
|
|
|
- chr = UART_GET_CHAR(uart);
|
|
|
-
|
|
|
- return chr;
|
|
|
-}
|
|
|
-#endif
|
|
|
-
|
|
|
-static struct uart_ops bfin_serial_pops = {
|
|
|
- .tx_empty = bfin_serial_tx_empty,
|
|
|
- .set_mctrl = bfin_serial_set_mctrl,
|
|
|
- .get_mctrl = bfin_serial_get_mctrl,
|
|
|
- .stop_tx = bfin_serial_stop_tx,
|
|
|
- .start_tx = bfin_serial_start_tx,
|
|
|
- .stop_rx = bfin_serial_stop_rx,
|
|
|
- .break_ctl = bfin_serial_break_ctl,
|
|
|
- .startup = bfin_serial_startup,
|
|
|
- .shutdown = bfin_serial_shutdown,
|
|
|
- .set_termios = bfin_serial_set_termios,
|
|
|
- .set_ldisc = bfin_serial_set_ldisc,
|
|
|
- .type = bfin_serial_type,
|
|
|
- .release_port = bfin_serial_release_port,
|
|
|
- .request_port = bfin_serial_request_port,
|
|
|
- .config_port = bfin_serial_config_port,
|
|
|
- .verify_port = bfin_serial_verify_port,
|
|
|
-#ifdef CONFIG_CONSOLE_POLL
|
|
|
- .poll_put_char = bfin_serial_poll_put_char,
|
|
|
- .poll_get_char = bfin_serial_poll_get_char,
|
|
|
-#endif
|
|
|
-};
|
|
|
-
|
|
|
-#if defined(CONFIG_SERIAL_BFIN_CONSOLE) || defined(CONFIG_EARLY_PRINTK)
|
|
|
-/*
|
|
|
- * If the port was already initialised (eg, by a boot loader),
|
|
|
- * try to determine the current setup.
|
|
|
- */
|
|
|
-static void __init
|
|
|
-bfin_serial_console_get_options(struct bfin_serial_port *uart, int *baud,
|
|
|
- int *parity, int *bits)
|
|
|
-{
|
|
|
- unsigned int status;
|
|
|
-
|
|
|
- status = UART_GET_IER(uart) & (ERBFI | ETBEI);
|
|
|
- if (status == (ERBFI | ETBEI)) {
|
|
|
- /* ok, the port was enabled */
|
|
|
- u32 lcr, clk;
|
|
|
-
|
|
|
- lcr = UART_GET_LCR(uart);
|
|
|
-
|
|
|
- *parity = 'n';
|
|
|
- if (lcr & PEN) {
|
|
|
- if (lcr & EPS)
|
|
|
- *parity = 'e';
|
|
|
- else
|
|
|
- *parity = 'o';
|
|
|
- }
|
|
|
- *bits = ((lcr & WLS_MASK) >> WLS_OFFSET) + 5;
|
|
|
-
|
|
|
- /* Set DLAB in LCR to Access CLK */
|
|
|
- UART_SET_DLAB(uart);
|
|
|
-
|
|
|
- clk = UART_GET_CLK(uart);
|
|
|
-
|
|
|
- /* Clear DLAB in LCR to Access THR RBR IER */
|
|
|
- UART_CLEAR_DLAB(uart);
|
|
|
-
|
|
|
- *baud = get_sclk() / (16*clk);
|
|
|
- }
|
|
|
- pr_debug("%s:baud = %d, parity = %c, bits= %d\n", __func__, *baud, *parity, *bits);
|
|
|
-}
|
|
|
-
|
|
|
-static struct uart_driver bfin_serial_reg;
|
|
|
-
|
|
|
-static void bfin_serial_console_putchar(struct uart_port *port, int ch)
|
|
|
-{
|
|
|
- struct bfin_serial_port *uart = (struct bfin_serial_port *)port;
|
|
|
- while (!(UART_GET_LSR(uart) & THRE))
|
|
|
- barrier();
|
|
|
- UART_PUT_CHAR(uart, ch);
|
|
|
-}
|
|
|
-
|
|
|
-#endif /* defined (CONFIG_SERIAL_BFIN_CONSOLE) ||
|
|
|
- defined (CONFIG_EARLY_PRINTK) */
|
|
|
-
|
|
|
-#ifdef CONFIG_SERIAL_BFIN_CONSOLE
|
|
|
-#define CLASS_BFIN_CONSOLE "bfin-console"
|
|
|
-/*
|
|
|
- * Interrupts are disabled on entering
|
|
|
- */
|
|
|
-static void
|
|
|
-bfin_serial_console_write(struct console *co, const char *s, unsigned int count)
|
|
|
-{
|
|
|
- struct bfin_serial_port *uart = bfin_serial_ports[co->index];
|
|
|
- unsigned long flags;
|
|
|
-
|
|
|
- spin_lock_irqsave(&uart->port.lock, flags);
|
|
|
- uart_console_write(&uart->port, s, count, bfin_serial_console_putchar);
|
|
|
- spin_unlock_irqrestore(&uart->port.lock, flags);
|
|
|
-
|
|
|
-}
|
|
|
-
|
|
|
-static int __init
|
|
|
-bfin_serial_console_setup(struct console *co, char *options)
|
|
|
-{
|
|
|
- struct bfin_serial_port *uart;
|
|
|
- int baud = 57600;
|
|
|
- int bits = 8;
|
|
|
- int parity = 'n';
|
|
|
-# if defined(SERIAL_BFIN_CTSRTS) || \
|
|
|
- defined(SERIAL_BFIN_HARD_CTSRTS)
|
|
|
- int flow = 'r';
|
|
|
-# else
|
|
|
- int flow = 'n';
|
|
|
-# endif
|
|
|
-
|
|
|
- /*
|
|
|
- * Check whether an invalid uart number has been specified, and
|
|
|
- * if so, search for the first available port that does have
|
|
|
- * console support.
|
|
|
- */
|
|
|
- if (co->index < 0 || co->index >= BFIN_UART_NR_PORTS)
|
|
|
- return -ENODEV;
|
|
|
-
|
|
|
- uart = bfin_serial_ports[co->index];
|
|
|
- if (!uart)
|
|
|
- return -ENODEV;
|
|
|
-
|
|
|
- if (options)
|
|
|
- uart_parse_options(options, &baud, &parity, &bits, &flow);
|
|
|
- else
|
|
|
- bfin_serial_console_get_options(uart, &baud, &parity, &bits);
|
|
|
-
|
|
|
- return uart_set_options(&uart->port, co, baud, parity, bits, flow);
|
|
|
-}
|
|
|
-
|
|
|
-static struct console bfin_serial_console = {
|
|
|
- .name = BFIN_SERIAL_DEV_NAME,
|
|
|
- .write = bfin_serial_console_write,
|
|
|
- .device = uart_console_device,
|
|
|
- .setup = bfin_serial_console_setup,
|
|
|
- .flags = CON_PRINTBUFFER,
|
|
|
- .index = -1,
|
|
|
- .data = &bfin_serial_reg,
|
|
|
-};
|
|
|
-#define BFIN_SERIAL_CONSOLE (&bfin_serial_console)
|
|
|
-#else
|
|
|
-#define BFIN_SERIAL_CONSOLE NULL
|
|
|
-#endif /* CONFIG_SERIAL_BFIN_CONSOLE */
|
|
|
-
|
|
|
-#ifdef CONFIG_EARLY_PRINTK
|
|
|
-static struct bfin_serial_port bfin_earlyprintk_port;
|
|
|
-#define CLASS_BFIN_EARLYPRINTK "bfin-earlyprintk"
|
|
|
-
|
|
|
-/*
|
|
|
- * Interrupts are disabled on entering
|
|
|
- */
|
|
|
-static void
|
|
|
-bfin_earlyprintk_console_write(struct console *co, const char *s, unsigned int count)
|
|
|
-{
|
|
|
- unsigned long flags;
|
|
|
-
|
|
|
- if (bfin_earlyprintk_port.port.line != co->index)
|
|
|
- return;
|
|
|
-
|
|
|
- spin_lock_irqsave(&bfin_earlyprintk_port.port.lock, flags);
|
|
|
- uart_console_write(&bfin_earlyprintk_port.port, s, count,
|
|
|
- bfin_serial_console_putchar);
|
|
|
- spin_unlock_irqrestore(&bfin_earlyprintk_port.port.lock, flags);
|
|
|
-}
|
|
|
-
|
|
|
-/*
|
|
|
- * This should have a .setup or .early_setup in it, but then things get called
|
|
|
- * without the command line options, and the baud rate gets messed up - so
|
|
|
- * don't let the common infrastructure play with things. (see calls to setup
|
|
|
- * & earlysetup in ./kernel/printk.c:register_console()
|
|
|
- */
|
|
|
-static struct console bfin_early_serial_console __initdata = {
|
|
|
- .name = "early_BFuart",
|
|
|
- .write = bfin_earlyprintk_console_write,
|
|
|
- .device = uart_console_device,
|
|
|
- .flags = CON_PRINTBUFFER,
|
|
|
- .index = -1,
|
|
|
- .data = &bfin_serial_reg,
|
|
|
-};
|
|
|
-#endif
|
|
|
-
|
|
|
-static struct uart_driver bfin_serial_reg = {
|
|
|
- .owner = THIS_MODULE,
|
|
|
- .driver_name = DRIVER_NAME,
|
|
|
- .dev_name = BFIN_SERIAL_DEV_NAME,
|
|
|
- .major = BFIN_SERIAL_MAJOR,
|
|
|
- .minor = BFIN_SERIAL_MINOR,
|
|
|
- .nr = BFIN_UART_NR_PORTS,
|
|
|
- .cons = BFIN_SERIAL_CONSOLE,
|
|
|
-};
|
|
|
-
|
|
|
-static int bfin_serial_suspend(struct platform_device *pdev, pm_message_t state)
|
|
|
-{
|
|
|
- struct bfin_serial_port *uart = platform_get_drvdata(pdev);
|
|
|
-
|
|
|
- return uart_suspend_port(&bfin_serial_reg, &uart->port);
|
|
|
-}
|
|
|
-
|
|
|
-static int bfin_serial_resume(struct platform_device *pdev)
|
|
|
-{
|
|
|
- struct bfin_serial_port *uart = platform_get_drvdata(pdev);
|
|
|
-
|
|
|
- return uart_resume_port(&bfin_serial_reg, &uart->port);
|
|
|
-}
|
|
|
-
|
|
|
-static int bfin_serial_probe(struct platform_device *pdev)
|
|
|
-{
|
|
|
- struct resource *res;
|
|
|
- struct bfin_serial_port *uart = NULL;
|
|
|
- int ret = 0;
|
|
|
-
|
|
|
- if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
|
|
|
- dev_err(&pdev->dev, "Wrong bfin uart platform device id.\n");
|
|
|
- return -ENOENT;
|
|
|
- }
|
|
|
-
|
|
|
- if (bfin_serial_ports[pdev->id] == NULL) {
|
|
|
-
|
|
|
- uart = kzalloc(sizeof(*uart), GFP_KERNEL);
|
|
|
- if (!uart) {
|
|
|
- dev_err(&pdev->dev,
|
|
|
- "fail to malloc bfin_serial_port\n");
|
|
|
- return -ENOMEM;
|
|
|
- }
|
|
|
- bfin_serial_ports[pdev->id] = uart;
|
|
|
-
|
|
|
-#ifdef CONFIG_EARLY_PRINTK
|
|
|
- if (!(bfin_earlyprintk_port.port.membase
|
|
|
- && bfin_earlyprintk_port.port.line == pdev->id)) {
|
|
|
- /*
|
|
|
- * If the peripheral PINs of current port is allocated
|
|
|
- * in earlyprintk probe stage, don't do it again.
|
|
|
- */
|
|
|
-#endif
|
|
|
- ret = peripheral_request_list(
|
|
|
- dev_get_platdata(&pdev->dev),
|
|
|
- DRIVER_NAME);
|
|
|
- if (ret) {
|
|
|
- dev_err(&pdev->dev,
|
|
|
- "fail to request bfin serial peripherals\n");
|
|
|
- goto out_error_free_mem;
|
|
|
- }
|
|
|
-#ifdef CONFIG_EARLY_PRINTK
|
|
|
- }
|
|
|
-#endif
|
|
|
-
|
|
|
- spin_lock_init(&uart->port.lock);
|
|
|
- uart->port.uartclk = get_sclk();
|
|
|
- uart->port.fifosize = BFIN_UART_TX_FIFO_SIZE;
|
|
|
- uart->port.ops = &bfin_serial_pops;
|
|
|
- uart->port.line = pdev->id;
|
|
|
- uart->port.iotype = UPIO_MEM;
|
|
|
- uart->port.flags = UPF_BOOT_AUTOCONF;
|
|
|
-
|
|
|
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
|
- if (res == NULL) {
|
|
|
- dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
|
|
|
- ret = -ENOENT;
|
|
|
- goto out_error_free_peripherals;
|
|
|
- }
|
|
|
-
|
|
|
- uart->port.membase = ioremap(res->start, resource_size(res));
|
|
|
- if (!uart->port.membase) {
|
|
|
- dev_err(&pdev->dev, "Cannot map uart IO\n");
|
|
|
- ret = -ENXIO;
|
|
|
- goto out_error_free_peripherals;
|
|
|
- }
|
|
|
- uart->port.mapbase = res->start;
|
|
|
-
|
|
|
- uart->tx_irq = platform_get_irq(pdev, 0);
|
|
|
- if (uart->tx_irq < 0) {
|
|
|
- dev_err(&pdev->dev, "No uart TX IRQ specified\n");
|
|
|
- ret = -ENOENT;
|
|
|
- goto out_error_unmap;
|
|
|
- }
|
|
|
-
|
|
|
- uart->rx_irq = platform_get_irq(pdev, 1);
|
|
|
- if (uart->rx_irq < 0) {
|
|
|
- dev_err(&pdev->dev, "No uart RX IRQ specified\n");
|
|
|
- ret = -ENOENT;
|
|
|
- goto out_error_unmap;
|
|
|
- }
|
|
|
- uart->port.irq = uart->rx_irq;
|
|
|
-
|
|
|
- uart->status_irq = platform_get_irq(pdev, 2);
|
|
|
- if (uart->status_irq < 0) {
|
|
|
- dev_err(&pdev->dev, "No uart status IRQ specified\n");
|
|
|
- ret = -ENOENT;
|
|
|
- goto out_error_unmap;
|
|
|
- }
|
|
|
-
|
|
|
-#ifdef CONFIG_SERIAL_BFIN_DMA
|
|
|
- spin_lock_init(&uart->rx_lock);
|
|
|
- uart->tx_done = 1;
|
|
|
- uart->tx_count = 0;
|
|
|
-
|
|
|
- res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
|
|
|
- if (res == NULL) {
|
|
|
- dev_err(&pdev->dev, "No uart TX DMA channel specified\n");
|
|
|
- ret = -ENOENT;
|
|
|
- goto out_error_unmap;
|
|
|
- }
|
|
|
- uart->tx_dma_channel = res->start;
|
|
|
-
|
|
|
- res = platform_get_resource(pdev, IORESOURCE_DMA, 1);
|
|
|
- if (res == NULL) {
|
|
|
- dev_err(&pdev->dev, "No uart RX DMA channel specified\n");
|
|
|
- ret = -ENOENT;
|
|
|
- goto out_error_unmap;
|
|
|
- }
|
|
|
- uart->rx_dma_channel = res->start;
|
|
|
-
|
|
|
- timer_setup(&uart->rx_dma_timer, bfin_serial_rx_dma_timeout, 0);
|
|
|
-#endif
|
|
|
-
|
|
|
-#if defined(SERIAL_BFIN_CTSRTS) || \
|
|
|
- defined(SERIAL_BFIN_HARD_CTSRTS)
|
|
|
- res = platform_get_resource(pdev, IORESOURCE_IO, 0);
|
|
|
- if (res == NULL)
|
|
|
- uart->cts_pin = -1;
|
|
|
- else
|
|
|
- uart->cts_pin = res->start;
|
|
|
-
|
|
|
- res = platform_get_resource(pdev, IORESOURCE_IO, 1);
|
|
|
- if (res == NULL)
|
|
|
- uart->rts_pin = -1;
|
|
|
- else
|
|
|
- uart->rts_pin = res->start;
|
|
|
-#endif
|
|
|
- }
|
|
|
-
|
|
|
-#ifdef CONFIG_SERIAL_BFIN_CONSOLE
|
|
|
- if (!is_early_platform_device(pdev)) {
|
|
|
-#endif
|
|
|
- uart = bfin_serial_ports[pdev->id];
|
|
|
- uart->port.dev = &pdev->dev;
|
|
|
- dev_set_drvdata(&pdev->dev, uart);
|
|
|
- ret = uart_add_one_port(&bfin_serial_reg, &uart->port);
|
|
|
-#ifdef CONFIG_SERIAL_BFIN_CONSOLE
|
|
|
- }
|
|
|
-#endif
|
|
|
-
|
|
|
- if (!ret)
|
|
|
- return 0;
|
|
|
-
|
|
|
- if (uart) {
|
|
|
-out_error_unmap:
|
|
|
- iounmap(uart->port.membase);
|
|
|
-out_error_free_peripherals:
|
|
|
- peripheral_free_list(dev_get_platdata(&pdev->dev));
|
|
|
-out_error_free_mem:
|
|
|
- kfree(uart);
|
|
|
- bfin_serial_ports[pdev->id] = NULL;
|
|
|
- }
|
|
|
-
|
|
|
- return ret;
|
|
|
-}
|
|
|
-
|
|
|
-static int bfin_serial_remove(struct platform_device *pdev)
|
|
|
-{
|
|
|
- struct bfin_serial_port *uart = platform_get_drvdata(pdev);
|
|
|
-
|
|
|
- dev_set_drvdata(&pdev->dev, NULL);
|
|
|
-
|
|
|
- if (uart) {
|
|
|
- uart_remove_one_port(&bfin_serial_reg, &uart->port);
|
|
|
- iounmap(uart->port.membase);
|
|
|
- peripheral_free_list(dev_get_platdata(&pdev->dev));
|
|
|
- kfree(uart);
|
|
|
- bfin_serial_ports[pdev->id] = NULL;
|
|
|
- }
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-
|
|
|
-static struct platform_driver bfin_serial_driver = {
|
|
|
- .probe = bfin_serial_probe,
|
|
|
- .remove = bfin_serial_remove,
|
|
|
- .suspend = bfin_serial_suspend,
|
|
|
- .resume = bfin_serial_resume,
|
|
|
- .driver = {
|
|
|
- .name = DRIVER_NAME,
|
|
|
- },
|
|
|
-};
|
|
|
-
|
|
|
-#if defined(CONFIG_SERIAL_BFIN_CONSOLE)
|
|
|
-static struct early_platform_driver early_bfin_serial_driver __initdata = {
|
|
|
- .class_str = CLASS_BFIN_CONSOLE,
|
|
|
- .pdrv = &bfin_serial_driver,
|
|
|
- .requested_id = EARLY_PLATFORM_ID_UNSET,
|
|
|
-};
|
|
|
-
|
|
|
-static int __init bfin_serial_rs_console_init(void)
|
|
|
-{
|
|
|
- early_platform_driver_register(&early_bfin_serial_driver, DRIVER_NAME);
|
|
|
-
|
|
|
- early_platform_driver_probe(CLASS_BFIN_CONSOLE, BFIN_UART_NR_PORTS, 0);
|
|
|
-
|
|
|
- register_console(&bfin_serial_console);
|
|
|
-
|
|
|
- return 0;
|
|
|
-}
|
|
|
-console_initcall(bfin_serial_rs_console_init);
|
|
|
-#endif
|
|
|
-
|
|
|
-#ifdef CONFIG_EARLY_PRINTK
|
|
|
-/*
|
|
|
- * Memory can't be allocated dynamically during earlyprink init stage.
|
|
|
- * So, do individual probe for earlyprink with a static uart port variable.
|
|
|
- */
|
|
|
-static int bfin_earlyprintk_probe(struct platform_device *pdev)
|
|
|
-{
|
|
|
- struct resource *res;
|
|
|
- int ret;
|
|
|
-
|
|
|
- if (pdev->id < 0 || pdev->id >= BFIN_UART_NR_PORTS) {
|
|
|
- dev_err(&pdev->dev, "Wrong earlyprintk platform device id.\n");
|
|
|
- return -ENOENT;
|
|
|
- }
|
|
|
-
|
|
|
- ret = peripheral_request_list(dev_get_platdata(&pdev->dev),
|
|
|
- DRIVER_NAME);
|
|
|
- if (ret) {
|
|
|
- dev_err(&pdev->dev,
|
|
|
- "fail to request bfin serial peripherals\n");
|
|
|
- return ret;
|
|
|
- }
|
|
|
-
|
|
|
- res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
|
- if (res == NULL) {
|
|
|
- dev_err(&pdev->dev, "Cannot get IORESOURCE_MEM\n");
|
|
|
- ret = -ENOENT;
|
|
|
- goto out_error_free_peripherals;
|
|
|
- }
|
|
|
-
|
|
|
- bfin_earlyprintk_port.port.membase = ioremap(res->start,
|
|
|
- resource_size(res));
|
|
|
- if (!bfin_earlyprintk_port.port.membase) {
|
|
|
- dev_err(&pdev->dev, "Cannot map uart IO\n");
|
|
|
- ret = -ENXIO;
|
|
|
- goto out_error_free_peripherals;
|
|
|
- }
|
|
|
- bfin_earlyprintk_port.port.mapbase = res->start;
|
|
|
- bfin_earlyprintk_port.port.line = pdev->id;
|
|
|
- bfin_earlyprintk_port.port.uartclk = get_sclk();
|
|
|
- bfin_earlyprintk_port.port.fifosize = BFIN_UART_TX_FIFO_SIZE;
|
|
|
- spin_lock_init(&bfin_earlyprintk_port.port.lock);
|
|
|
-
|
|
|
- return 0;
|
|
|
-
|
|
|
-out_error_free_peripherals:
|
|
|
- peripheral_free_list(dev_get_platdata(&pdev->dev));
|
|
|
-
|
|
|
- return ret;
|
|
|
-}
|
|
|
-
|
|
|
-static struct platform_driver bfin_earlyprintk_driver = {
|
|
|
- .probe = bfin_earlyprintk_probe,
|
|
|
- .driver = {
|
|
|
- .name = DRIVER_NAME,
|
|
|
- .owner = THIS_MODULE,
|
|
|
- },
|
|
|
-};
|
|
|
-
|
|
|
-static struct early_platform_driver early_bfin_earlyprintk_driver __initdata = {
|
|
|
- .class_str = CLASS_BFIN_EARLYPRINTK,
|
|
|
- .pdrv = &bfin_earlyprintk_driver,
|
|
|
- .requested_id = EARLY_PLATFORM_ID_UNSET,
|
|
|
-};
|
|
|
-
|
|
|
-struct console __init *bfin_earlyserial_init(unsigned int port,
|
|
|
- unsigned int cflag)
|
|
|
-{
|
|
|
- struct ktermios t;
|
|
|
- char port_name[20];
|
|
|
-
|
|
|
- if (port < 0 || port >= BFIN_UART_NR_PORTS)
|
|
|
- return NULL;
|
|
|
-
|
|
|
- /*
|
|
|
- * Only probe resource of the given port in earlyprintk boot arg.
|
|
|
- * The expected port id should be indicated in port name string.
|
|
|
- */
|
|
|
- snprintf(port_name, 20, DRIVER_NAME ".%d", port);
|
|
|
- early_platform_driver_register(&early_bfin_earlyprintk_driver,
|
|
|
- port_name);
|
|
|
- early_platform_driver_probe(CLASS_BFIN_EARLYPRINTK, 1, 0);
|
|
|
-
|
|
|
- if (!bfin_earlyprintk_port.port.membase)
|
|
|
- return NULL;
|
|
|
-
|
|
|
-#ifdef CONFIG_SERIAL_BFIN_CONSOLE
|
|
|
- /*
|
|
|
- * If we are using early serial, don't let the normal console rewind
|
|
|
- * log buffer, since that causes things to be printed multiple times
|
|
|
- */
|
|
|
- bfin_serial_console.flags &= ~CON_PRINTBUFFER;
|
|
|
-#endif
|
|
|
-
|
|
|
- bfin_early_serial_console.index = port;
|
|
|
- t.c_cflag = cflag;
|
|
|
- t.c_iflag = 0;
|
|
|
- t.c_oflag = 0;
|
|
|
- t.c_lflag = ICANON;
|
|
|
- t.c_line = port;
|
|
|
- bfin_serial_set_termios(&bfin_earlyprintk_port.port, &t, &t);
|
|
|
-
|
|
|
- return &bfin_early_serial_console;
|
|
|
-}
|
|
|
-#endif /* CONFIG_EARLY_PRINTK */
|
|
|
-
|
|
|
-static int __init bfin_serial_init(void)
|
|
|
-{
|
|
|
- int ret;
|
|
|
-
|
|
|
- pr_info("Blackfin serial driver\n");
|
|
|
-
|
|
|
- ret = uart_register_driver(&bfin_serial_reg);
|
|
|
- if (ret) {
|
|
|
- pr_err("failed to register %s:%d\n",
|
|
|
- bfin_serial_reg.driver_name, ret);
|
|
|
- }
|
|
|
-
|
|
|
- ret = platform_driver_register(&bfin_serial_driver);
|
|
|
- if (ret) {
|
|
|
- pr_err("fail to register bfin uart\n");
|
|
|
- uart_unregister_driver(&bfin_serial_reg);
|
|
|
- }
|
|
|
-
|
|
|
- return ret;
|
|
|
-}
|
|
|
-
|
|
|
-static void __exit bfin_serial_exit(void)
|
|
|
-{
|
|
|
- platform_driver_unregister(&bfin_serial_driver);
|
|
|
- uart_unregister_driver(&bfin_serial_reg);
|
|
|
-}
|
|
|
-
|
|
|
-
|
|
|
-module_init(bfin_serial_init);
|
|
|
-module_exit(bfin_serial_exit);
|
|
|
-
|
|
|
-MODULE_AUTHOR("Sonic Zhang, Aubrey Li");
|
|
|
-MODULE_DESCRIPTION("Blackfin generic serial port driver");
|
|
|
-MODULE_LICENSE("GPL");
|
|
|
-MODULE_ALIAS_CHARDEV_MAJOR(BFIN_SERIAL_MAJOR);
|
|
|
-MODULE_ALIAS("platform:bfin-uart");
|
Arnd Bergmann