diff options
Diffstat (limited to 'nuttx/drivers/serial/uart_16550.c')
| -rw-r--r-- | nuttx/drivers/serial/uart_16550.c | 1164 |
1 files changed, 0 insertions, 1164 deletions
diff --git a/nuttx/drivers/serial/uart_16550.c b/nuttx/drivers/serial/uart_16550.c deleted file mode 100644 index 8fb71bfd2..000000000 --- a/nuttx/drivers/serial/uart_16550.c +++ /dev/null @@ -1,1164 +0,0 @@ -/**************************************************************************** - * drivers/serial/uart_16550.c - * Serial driver for 16550 UART - * - * Copyright (C) 2011 Gregory Nutt. All rights reserved. - * Author: Gregory Nutt <gnutt@nuttx.org> - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in - * the documentation and/or other materials provided with the - * distribution. - * 3. Neither the name NuttX nor the names of its contributors may be - * used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS - * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT - * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS - * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE - * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, - * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS - * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED - * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN - * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE - * POSSIBILITY OF SUCH DAMAGE. - * - ****************************************************************************/ - -/**************************************************************************** - * Included Files - ****************************************************************************/ - -#include <nuttx/config.h> - -#include <sys/types.h> -#include <stdint.h> -#include <stdbool.h> -#include <unistd.h> -#include <semaphore.h> -#include <string.h> -#include <errno.h> -#include <debug.h> - -#include <nuttx/irq.h> -#include <nuttx/arch.h> -#include <nuttx/serial/serial.h> -#include <nuttx/fs/ioctl.h> -#include <nuttx/serial/uart_16550.h> - -#include <arch/board/board.h> - -#ifdef CONFIG_16550_UART - -/**************************************************************************** - * Pre-processor definitions - ****************************************************************************/ - -/**************************************************************************** - * Private Types - ****************************************************************************/ - -struct u16550_s -{ - uart_addrwidth_t uartbase; /* Base address of UART registers */ -#ifndef CONFIG_16550_SUPRESS_CONFIG - uint32_t baud; /* Configured baud */ - uint32_t uartclk; /* UART clock frequency */ -#endif -#ifndef CONFIG_SUPPRESS_SERIAL_INTS - uart_datawidth_t ier; /* Saved IER value */ - uint8_t irq; /* IRQ associated with this UART */ -#endif -#ifndef CONFIG_16550_SUPRESS_CONFIG - uint8_t parity; /* 0=none, 1=odd, 2=even */ - uint8_t bits; /* Number of bits (7 or 8) */ - bool stopbits2; /* true: Configure with 2 stop bits instead of 1 */ -#endif -}; - -/**************************************************************************** - * Private Function Prototypes - ****************************************************************************/ - -static int u16550_setup(struct uart_dev_s *dev); -static void u16550_shutdown(struct uart_dev_s *dev); -static int u16550_attach(struct uart_dev_s *dev); -static void u16550_detach(struct uart_dev_s *dev); -#ifndef CONFIG_SUPPRESS_SERIAL_INTS -static int u16550_interrupt(int irq, void *context); -#endif -static int u16550_ioctl(struct file *filep, int cmd, unsigned long arg); -static int u16550_receive(struct uart_dev_s *dev, uint32_t *status); -static void u16550_rxint(struct uart_dev_s *dev, bool enable); -static bool u16550_rxavailable(struct uart_dev_s *dev); -static void u16550_send(struct uart_dev_s *dev, int ch); -static void u16550_txint(struct uart_dev_s *dev, bool enable); -static bool u16550_txready(struct uart_dev_s *dev); -static bool u16550_txempty(struct uart_dev_s *dev); - -/**************************************************************************** - * Private Variables - ****************************************************************************/ - -struct uart_ops_s g_uart_ops = -{ - .setup = u16550_setup, - .shutdown = u16550_shutdown, - .attach = u16550_attach, - .detach = u16550_detach, - .ioctl = u16550_ioctl, - .receive = u16550_receive, - .rxint = u16550_rxint, - .rxavailable = u16550_rxavailable, - .send = u16550_send, - .txint = u16550_txint, - .txready = u16550_txready, - .txempty = u16550_txempty, -}; - -/* I/O buffers */ - -#ifdef CONFIG_16550_UART0 -static char g_uart0rxbuffer[CONFIG_16550_UART0_RXBUFSIZE]; -static char g_uart0txbuffer[CONFIG_16550_UART0_TXBUFSIZE]; -#endif -#ifdef CONFIG_16550_UART1 -static char g_uart1rxbuffer[CONFIG_16550_UART1_RXBUFSIZE]; -static char g_uart1txbuffer[CONFIG_16550_UART1_TXBUFSIZE]; -#endif -#ifdef CONFIG_16550_UART2 -static char g_uart2rxbuffer[CONFIG_16550_UART2_RXBUFSIZE]; -static char g_uart2txbuffer[CONFIG_16550_UART2_TXBUFSIZE]; -#endif -#ifdef CONFIG_16550_UART3 -static char g_uart3rxbuffer[CONFIG_16550_UART3_RXBUFSIZE]; -static char g_uart3txbuffer[CONFIG_16550_UART3_TXBUFSIZE]; -#endif - -/* This describes the state of the LPC17xx uart0 port. */ - -#ifdef CONFIG_16550_UART0 -static struct u16550_s g_uart0priv = -{ - .uartbase = CONFIG_16550_UART0_BASE, -#ifndef CONFIG_16550_SUPRESS_CONFIG - .baud = CONFIG_16550_UART0_BAUD, - .uartclk = CONFIG_16550_UART0_CLOCK, -#endif -#ifndef CONFIG_SUPPRESS_SERIAL_INTS - .irq = CONFIG_16550_UART0_IRQ, -#endif -#ifndef CONFIG_16550_SUPRESS_CONFIG - .parity = CONFIG_16550_UART0_PARITY, - .bits = CONFIG_16550_UART0_BITS, - .stopbits2 = CONFIG_16550_UART0_2STOP, -#endif -}; - -static uart_dev_t g_uart0port = -{ - .recv = - { - .size = CONFIG_16550_UART0_RXBUFSIZE, - .buffer = g_uart0rxbuffer, - }, - .xmit = - { - .size = CONFIG_16550_UART0_TXBUFSIZE, - .buffer = g_uart0txbuffer, - }, - .ops = &g_uart_ops, - .priv = &g_uart0priv, -}; -#endif - -/* This describes the state of the LPC17xx uart1 port. */ - -#ifdef CONFIG_16550_UART1 -static struct u16550_s g_uart1priv = -{ - .uartbase = CONFIG_16550_UART1_BASE, -#ifndef CONFIG_16550_SUPRESS_CONFIG - .baud = CONFIG_16550_UART1_BAUD, - .uartclk = CONFIG_16550_UART1_CLOCK, -#endif -#ifndef CONFIG_SUPPRESS_SERIAL_INTS - .irq = CONFIG_16550_UART1_IRQ, -#endif -#ifndef CONFIG_16550_SUPRESS_CONFIG - .parity = CONFIG_16550_UART1_PARITY, - .bits = CONFIG_16550_UART1_BITS, - .stopbits2 = CONFIG_16550_UART1_2STOP, -#endif -}; - -static uart_dev_t g_uart1port = -{ - .recv = - { - .size = CONFIG_16550_UART1_RXBUFSIZE, - .buffer = g_uart1rxbuffer, - }, - .xmit = - { - .size = CONFIG_16550_UART1_TXBUFSIZE, - .buffer = g_uart1txbuffer, - }, - .ops = &g_uart_ops, - .priv = &g_uart1priv, -}; -#endif - -/* This describes the state of the LPC17xx uart1 port. */ - -#ifdef CONFIG_16550_UART2 -static struct u16550_s g_uart2priv = -{ - .uartbase = CONFIG_16550_UART2_BASE, -#ifndef CONFIG_16550_SUPRESS_CONFIG - .baud = CONFIG_16550_UART2_BAUD, - .uartclk = CONFIG_16550_UART2_CLOCK, -#endif -#ifndef CONFIG_SUPPRESS_SERIAL_INTS - .irq = CONFIG_16550_UART2_IRQ, -#endif -#ifndef CONFIG_16550_SUPRESS_CONFIG - .parity = CONFIG_16550_UART2_PARITY, - .bits = CONFIG_16550_UART2_BITS, - .stopbits2 = CONFIG_16550_UART2_2STOP, -#endif -}; - -static uart_dev_t g_uart2port = -{ - .recv = - { - .size = CONFIG_16550_UART2_RXBUFSIZE, - .buffer = g_uart2rxbuffer, - }, - .xmit = - { - .size = CONFIG_16550_UART2_TXBUFSIZE, - .buffer = g_uart2txbuffer, - }, - .ops = &g_uart_ops, - .priv = &g_uart2priv, -}; -#endif - -/* This describes the state of the LPC17xx uart1 port. */ - -#ifdef CONFIG_16550_UART3 -static struct u16550_s g_uart3priv = -{ - .uartbase = CONFIG_16550_UART3_BASE, -#ifndef CONFIG_16550_SUPRESS_CONFIG - .baud = CONFIG_16550_UART3_BAUD, - .uartclk = CONFIG_16550_UART3_CLOCK, -#endif -#ifndef CONFIG_SUPPRESS_SERIAL_INTS - .irq = CONFIG_16550_UART3_IRQ, -#endif -#ifndef CONFIG_16550_SUPRESS_CONFIG - .parity = CONFIG_16550_UART3_PARITY, - .bits = CONFIG_16550_UART3_BITS, - .stopbits2 = CONFIG_16550_UART3_2STOP, -#endif -}; - -static uart_dev_t g_uart3port = -{ - .recv = - { - .size = CONFIG_16550_UART3_RXBUFSIZE, - .buffer = g_uart3rxbuffer, - }, - .xmit = - { - .size = CONFIG_16550_UART3_TXBUFSIZE, - .buffer = g_uart3txbuffer, - }, - .ops = &g_uart_ops, - .priv = &g_uart3priv, -}; -#endif - -/* Which UART with be tty0/console and which tty1? tty2? tty3? */ - -#if defined(CONFIG_16550_UART0_SERIAL_CONSOLE) -# define CONSOLE_DEV g_uart0port /* UART0=console */ -# define TTYS0_DEV g_uart0port /* UART0=ttyS0 */ -# ifdef CONFIG_16550_UART1 -# define TTYS1_DEV g_uart1port /* UART0=ttyS0;UART1=ttyS1 */ -# ifdef CONFIG_16550_UART2 -# define TTYS2_DEV g_uart2port /* UART0=ttyS0;UART1=ttyS1;UART2=ttyS2 */ -# ifdef CONFIG_16550_UART3 -# define TTYS3_DEV g_uart3port /* UART0=ttyS0;UART1=ttyS1;UART2=ttyS2;UART3=ttyS3 */ -# else -# undef TTYS3_DEV /* UART0=ttyS0;UART1=ttyS1;UART2=ttyS;No ttyS3 */ -# endif -# else -# ifdef CONFIG_16550_UART3 -# define TTYS2_DEV g_uart3port /* UART0=ttyS0;UART1=ttyS1;UART3=ttys2;No ttyS3 */ -# else -# undef TTYS2_DEV /* UART0=ttyS0;UART1=ttyS1;No ttyS2;No ttyS3 */ -# endif -# undef TTYS3_DEV /* No ttyS3 */ -# endif -# else -# ifdef CONFIG_16550_UART2 -# define TTYS1_DEV g_uart2port /* UART0=ttyS0;UART2=ttyS1;No ttyS3 */ -# ifdef CONFIG_16550_UART3 -# define TTYS2_DEV g_uart3port /* UART0=ttyS0;UART2=ttyS1;UART3=ttyS2;No ttyS3 */ -# else -# undef TTYS2_DEV /* UART0=ttyS0;UART2=ttyS1;No ttyS2;No ttyS3 */ -# endif -# undef TTYS3_DEV /* No ttyS3 */ -# else -# ifdef CONFIG_16550_UART3 -# define TTYS1_DEV g_uart3port /* UART0=ttyS0;UART3=ttyS1;No ttyS2;No ttyS3 */ -# else -# undef TTYS1_DEV /* UART0=ttyS0;No ttyS1;No ttyS2;No ttyS3 */ -# endif -# undef TTYS2_DEV /* No ttyS2 */ -# undef TTYS3_DEV /* No ttyS3 */ -# endif -# endif -#elif defined(CONFIG_16550_UART1_SERIAL_CONSOLE) -# define CONSOLE_DEV g_uart1port /* UART1=console */ -# define TTYS0_DEV g_uart1port /* UART1=ttyS0 */ -# ifdef CONFIG_16550_UART -# define TTYS1_DEV g_uart0port /* UART1=ttyS0;UART0=ttyS1 */ -# ifdef CONFIG_16550_UART2 -# define TTYS2_DEV g_uart2port /* UART1=ttyS0;UART0=ttyS1;UART2=ttyS2 */ -# ifdef CONFIG_16550_UART3 -# define TTYS3_DEV g_uart3port /* UART1=ttyS0;UART0=ttyS1;UART2=ttyS2;UART3=ttyS3 */ -# else -# undef TTYS3_DEV /* UART1=ttyS0;UART0=ttyS1;UART2=ttyS;No ttyS3 */ -# endif -# else -# ifdef CONFIG_16550_UART3 -# define TTYS2_DEV g_uart3port /* UART1=ttyS0;UART0=ttyS1;UART3=ttys2;No ttyS3 */ -# else -# undef TTYS2_DEV /* UART1=ttyS0;UART0=ttyS1;No ttyS2;No ttyS3 */ -# endif -# undef TTYS3_DEV /* No ttyS3 */ -# endif -# else -# ifdef CONFIG_16550_UART2 -# define TTYS1_DEV g_uart2port /* UART1=ttyS0;UART2=ttyS1 */ -# ifdef CONFIG_16550_UART3 -# define TTYS2_DEV g_uart3port /* UART1=ttyS0;UART2=ttyS1;UART3=ttyS2;No ttyS3 */ -# else -# undef TTYS2_DEV /* UART1=ttyS0;UART2=ttyS1;No ttyS2;No ttyS3 */ -# endif -# undef TTYS3_DEV /* No ttyS3 */ -# else -# ifdef CONFIG_16550_UART3 -# define TTYS1_DEV g_uart3port /* UART1=ttyS0;UART3=ttyS1;No ttyS2;No ttyS3 */ -# else -# undef TTYS1_DEV /* UART1=ttyS0;No ttyS1;No ttyS2;No ttyS3 */ -# endif -# undef TTYS2_DEV /* No ttyS2 */ -# undef TTYS3_DEV /* No ttyS3 */ -# endif -# endif -#elif defined(CONFIG_16550_UART2_SERIAL_CONSOLE) -# define CONSOLE_DEV g_uart2port /* UART2=console */ -# define TTYS0_DEV g_uart2port /* UART2=ttyS0 */ -# ifdef CONFIG_16550_UART -# define TTYS1_DEV g_uart0port /* UART2=ttyS0;UART0=ttyS1 */ -# ifdef CONFIG_16550_UART1 -# define TTYS2_DEV g_uart1port /* UART2=ttyS0;UART0=ttyS1;UART1=ttyS2 */ -# ifdef CONFIG_16550_UART3 -# define TTYS3_DEV g_uart3port /* UART2=ttyS0;UART0=ttyS1;UART1=ttyS2;UART3=ttyS3 */ -# else -# undef TTYS3_DEV /* UART2=ttyS0;UART0=ttyS1;UART1=ttyS;No ttyS3 */ -# endif -# else -# ifdef CONFIG_16550_UART3 -# define TTYS2_DEV g_uart3port /* UART2=ttyS0;UART0=ttyS1;UART3=ttys2;No ttyS3 */ -# else -# undef TTYS2_DEV /* UART2=ttyS0;UART0=ttyS1;No ttyS2;No ttyS3 */ -# endif -# undef TTYS3_DEV /* No ttyS3 */ -# endif -# else -# ifdef CONFIG_16550_UART1 -# define TTYS1_DEV g_uart1port /* UART2=ttyS0;UART1=ttyS1 */ -# ifdef CONFIG_16550_UART3 -# define TTYS2_DEV g_uart3port /* UART2=ttyS0;UART1=ttyS1;UART3=ttyS2 */ -# else -# undef TTYS2_DEV /* UART2=ttyS0;UART1=ttyS1;No ttyS2;No ttyS3 */ -# endif -# undef TTYS3_DEV /* No ttyS3 */ -# else -# ifdef CONFIG_16550_UART3 -# define TTYS1_DEV g_uart3port /* UART2=ttyS0;UART3=ttyS1;No ttyS3 */ -# else -# undef TTYS1_DEV /* UART2=ttyS0;No ttyS1;No ttyS2;No ttyS3 */ -# endif -# undef TTYS2_DEV /* No ttyS2 */ -# undef TTYS3_DEV /* No ttyS3 */ -# endif -# endif -#elif defined(CONFIG_16550_UART3_SERIAL_CONSOLE) -# define CONSOLE_DEV g_uart3port /* UART3=console */ -# define TTYS0_DEV g_uart3port /* UART3=ttyS0 */ -# ifdef CONFIG_16550_UART -# define TTYS1_DEV g_uart0port /* UART3=ttyS0;UART0=ttyS1 */ -# ifdef CONFIG_16550_UART1 -# define TTYS2_DEV g_uart1port /* UART3=ttyS0;UART0=ttyS1;UART1=ttyS2 */ -# ifdef CONFIG_16550_UART2 -# define TTYS3_DEV g_uart2port /* UART3=ttyS0;UART0=ttyS1;UART1=ttyS2;UART2=ttyS3 */ -# else -# undef TTYS3_DEV /* UART3=ttyS0;UART0=ttyS1;UART1=ttyS;No ttyS3 */ -# endif -# else -# ifdef CONFIG_16550_UART2 -# define TTYS2_DEV g_uart2port /* UART3=ttyS0;UART0=ttyS1;UART2=ttys2;No ttyS3 */ -# else -# undef TTYS2_DEV /* UART3=ttyS0;UART0=ttyS1;No ttyS2;No ttyS3 */ -# endif -# undef TTYS3_DEV /* No ttyS3 */ -# endif -# else -# ifdef CONFIG_16550_UART1 -# define TTYS1_DEV g_uart1port /* UART3=ttyS0;UART1=ttyS1 */ -# ifdef CONFIG_16550_UART2 -# define TTYS2_DEV g_uart2port /* UART3=ttyS0;UART1=ttyS1;UART2=ttyS2;No ttyS3 */ -# else -# undef TTYS2_DEV /* UART3=ttyS0;UART1=ttyS1;No ttyS2;No ttyS3 */ -# endif -# undef TTYS3_DEV /* No ttyS3 */ -# else -# ifdef CONFIG_16550_UART2 -# define TTYS1_DEV g_uart2port /* UART3=ttyS0;UART2=ttyS1;No ttyS3;No ttyS3 */ -# undef TTYS3_DEV /* UART3=ttyS0;UART2=ttyS1;No ttyS2;No ttyS3 */ -# else -# undef TTYS1_DEV /* UART3=ttyS0;No ttyS1;No ttyS2;No ttyS3 */ -# endif -# undef TTYS2_DEV /* No ttyS2 */ -# undef TTYS3_DEV /* No ttyS3 */ -# endif -# endif -#endif - -/************************************************************************************ - * Inline Functions - ************************************************************************************/ - -/**************************************************************************** - * Name: u16550_serialin - ****************************************************************************/ - -static inline uart_datawidth_t u16550_serialin(struct u16550_s *priv, int offset) -{ - return uart_getreg(priv->uartbase, offset); -} - -/**************************************************************************** - * Name: u16550_serialout - ****************************************************************************/ - -static inline void u16550_serialout(struct u16550_s *priv, int offset, uart_datawidth_t value) -{ - uart_putreg(priv->uartbase, offset, value); -} - -/**************************************************************************** - * Name: u16550_disableuartint - ****************************************************************************/ - -#ifndef CONFIG_SUPPRESS_SERIAL_INTS -static inline void u16550_disableuartint(struct u16550_s *priv, uart_datawidth_t *ier) -{ - if (ier) - { - *ier = priv->ier & UART_IER_ALLIE; - } - - priv->ier &= ~UART_IER_ALLIE; - u16550_serialout(priv, UART_IER_OFFSET, priv->ier); -} -#else -# define u16550_disableuartint(priv,ier) -#endif - -/**************************************************************************** - * Name: u16550_restoreuartint - ****************************************************************************/ - -#ifndef CONFIG_SUPPRESS_SERIAL_INTS -static inline void u16550_restoreuartint(struct u16550_s *priv, uint32_t ier) -{ - priv->ier |= ier & UART_IER_ALLIE; - u16550_serialout(priv, UART_IER_OFFSET, priv->ier); -} -#else -# define u16550_restoreuartint(priv,ier) -#endif - -/**************************************************************************** - * Name: u16550_enablebreaks - ****************************************************************************/ - -static inline void u16550_enablebreaks(struct u16550_s *priv, bool enable) -{ - uint32_t lcr = u16550_serialin(priv, UART_LCR_OFFSET); - if (enable) - { - lcr |= UART_LCR_BRK; - } - else - { - lcr &= ~UART_LCR_BRK; - } - u16550_serialout(priv, UART_LCR_OFFSET, lcr); -} - -/************************************************************************************ - * Name: u16550_divisor - * - * Descrption: - * Select a divider to produce the BAUD from the UART_CLK. - * - * BAUD = UART_CLK / (16 * DL), or - * DIV = UART_CLK / BAUD / 16 - * - * Ignoring the fractional divider for now. - * - ************************************************************************************/ - -#ifndef CONFIG_16550_SUPRESS_CONFIG -static inline uint32_t u16550_divisor(struct u16550_s *priv) -{ - return (priv->uartclk + (priv->baud << 3)) / (priv->baud << 4); -} -#endif - -/**************************************************************************** - * Private Functions - ****************************************************************************/ - -/**************************************************************************** - * Name: u16550_setup - * - * Description: - * Configure the UART baud, bits, parity, fifos, etc. This - * method is called the first time that the serial port is - * opened. - * - ****************************************************************************/ - -static int u16550_setup(struct uart_dev_s *dev) -{ -#ifndef CONFIG_16550_SUPRESS_CONFIG - struct u16550_s *priv = (struct u16550_s*)dev->priv; - uint16_t div; - uint32_t lcr; - - /* Clear fifos */ - - u16550_serialout(priv, UART_FCR_OFFSET, (UART_FCR_RXRST|UART_FCR_TXRST)); - - /* Set trigger */ - - u16550_serialout(priv, UART_FCR_OFFSET, (UART_FCR_FIFOEN|UART_FCR_RXTRIGGER_8)); - - /* Set up the IER */ - -#ifndef CONFIG_SUPPRESS_SERIAL_INTS - priv->ier = u16550_serialin(priv, UART_IER_OFFSET); -#endif - - /* Set up the LCR */ - - lcr = 0; - switch (priv->bits) - { - case 5 : - lcr |= UART_LCR_WLS_7BIT; - break; - - case 6 : - lcr |= UART_LCR_WLS_7BIT; - break; - - case 7 : - lcr |= UART_LCR_WLS_7BIT; - break; - - default: - case 8 : - lcr |= UART_LCR_WLS_7BIT; - break; - } - - if (priv->stopbits2) - { - lcr |= UART_LCR_STB; - } - - if (priv->parity == 1) - { - lcr |= UART_LCR_PEN; - } - else if (priv->parity == 2) - { - lcr |= (UART_LCR_PEN|UART_LCR_EPS); - } - - /* Enter DLAB=1 */ - - u16550_serialout(priv, UART_LCR_OFFSET, (lcr | UART_LCR_DLAB)); - - /* Set the BAUD divisor */ - - div = u16550_divisor(priv); - u16550_serialout(priv, UART_DLM_OFFSET, div >> 8); - u16550_serialout(priv, UART_DLL_OFFSET, div & 0xff); - - /* Clear DLAB */ - - u16550_serialout(priv, UART_LCR_OFFSET, lcr); - - /* Configure the FIFOs */ - - u16550_serialout(priv, UART_FCR_OFFSET, - (UART_FCR_RXTRIGGER_8|UART_FCR_TXRST|UART_FCR_RXRST|UART_FCR_FIFOEN)); -#endif - return OK; -} - -/**************************************************************************** - * Name: u16550_shutdown - * - * Description: - * Disable the UART. This method is called when the serial - * port is closed - * - ****************************************************************************/ - -static void u16550_shutdown(struct uart_dev_s *dev) -{ - struct u16550_s *priv = (struct u16550_s*)dev->priv; - u16550_disableuartint(priv, NULL); -} - -/**************************************************************************** - * Name: u16550_attach - * - * Description: - * Configure the UART to operation in interrupt driven mode. This method is - * called when the serial port is opened. Normally, this is just after the - * the setup() method is called, however, the serial console may operate in - * a non-interrupt driven mode during the boot phase. - * - * RX and TX interrupts are not enabled when by the attach method (unless the - * hardware supports multiple levels of interrupt enabling). The RX and TX - * interrupts are not enabled until the txint() and rxint() methods are called. - * - ****************************************************************************/ - -static int u16550_attach(struct uart_dev_s *dev) -{ -#ifndef CONFIG_SUPPRESS_SERIAL_INTS - struct u16550_s *priv = (struct u16550_s*)dev->priv; - int ret; - - /* Attach and enable the IRQ */ - - ret = irq_attach(priv->irq, u16550_interrupt); -#ifndef CONFIG_ARCH_NOINTC - if (ret == OK) - { - /* Enable the interrupt (RX and TX interrupts are still disabled - * in the UART - */ - - up_enable_irq(priv->irq); - } -#endif - return ret; -#else - return OK; -#endif -} - -/**************************************************************************** - * Name: u16550_detach - * - * Description: - * Detach UART interrupts. This method is called when the serial port is - * closed normally just before the shutdown method is called. The exception is - * the serial console which is never shutdown. - * - ****************************************************************************/ - -static void u16550_detach(struct uart_dev_s *dev) -{ -#ifndef CONFIG_SUPPRESS_SERIAL_INTS - struct u16550_s *priv = (struct u16550_s*)dev->priv; -#ifndef CONFIG_ARCH_NOINTC - up_disable_irq(priv->irq); -#endif - irq_detach(priv->irq); -#endif -} - -/**************************************************************************** - * Name: u16550_interrupt - * - * Description: - * This is the UART interrupt handler. It will be invoked when an - * interrupt received on the 'irq' It should call uart_transmitchars or - * uart_receivechar to perform the appropriate data transfers. The - * interrupt handling logic must be able to map the 'irq' number into the - * appropriate u16550_s structure in order to call these functions. - * - ****************************************************************************/ - -#ifndef CONFIG_SUPPRESS_SERIAL_INTS -static int u16550_interrupt(int irq, void *context) -{ - struct uart_dev_s *dev = NULL; - struct u16550_s *priv; - uint32_t status; - int passes; - -#ifdef CONFIG_16550_UART0 - if (g_uart0priv.irq == irq) - { - dev = &g_uart0port; - } - else -#endif -#ifdef CONFIG_16550_UART1 - if (g_uart1priv.irq == irq) - { - dev = &g_uart1port; - } - else -#endif -#ifdef CONFIG_16550_UART2 - if (g_uart2priv.irq == irq) - { - dev = &g_uart2port; - } - else -#endif -#ifdef CONFIG_16550_UART3 - if (g_uart3priv.irq == irq) - { - dev = &g_uart3port; - } -#endif - ASSERT(dev != NULL); - priv = (struct u16550_s*)dev->priv; - - /* Loop until there are no characters to be transferred or, - * until we have been looping for a long time. - */ - - for (passes = 0; passes < 256; passes++) - { - /* Get the current UART status and check for loop - * termination conditions - */ - - status = u16550_serialin(priv, UART_IIR_OFFSET); - - /* The UART_IIR_INTSTATUS bit should be zero if there are pending - * interrupts - */ - - if ((status & UART_IIR_INTSTATUS) != 0) - { - /* Break out of the loop when there is no longer a - * pending interrupt - */ - - break; - } - - /* Handle the interrupt by its interrupt ID field */ - - switch (status & UART_IIR_INTID_MASK) - { - /* Handle incoming, receive bytes (with or without timeout) */ - - case UART_IIR_INTID_RDA: - case UART_IIR_INTID_CTI: - { - uart_recvchars(dev); - break; - } - - /* Handle outgoing, transmit bytes */ - - case UART_IIR_INTID_THRE: - { - uart_xmitchars(dev); - break; - } - - /* Just clear modem status interrupts (UART1 only) */ - - case UART_IIR_INTID_MSI: - { - /* Read the modem status register (MSR) to clear */ - - status = u16550_serialin(priv, UART_MSR_OFFSET); - vdbg("MSR: %02x\n", status); - break; - } - - /* Just clear any line status interrupts */ - - case UART_IIR_INTID_RLS: - { - /* Read the line status register (LSR) to clear */ - - status = u16550_serialin(priv, UART_LSR_OFFSET); - vdbg("LSR: %02x\n", status); - break; - } - - /* There should be no other values */ - - default: - { - dbg("Unexpected IIR: %02x\n", status); - break; - } - } - } - - return OK; -} -#endif - -/**************************************************************************** - * Name: u16550_ioctl - * - * Description: - * All ioctl calls will be routed through this method - * - ****************************************************************************/ - -static int u16550_ioctl(struct file *filep, int cmd, unsigned long arg) -{ - struct inode *inode = filep->f_inode; - struct uart_dev_s *dev = inode->i_private; - struct u16550_s *priv = (struct u16550_s*)dev->priv; - int ret = OK; - - switch (cmd) - { - case TIOCSERGSTRUCT: - { - struct u16550_s *user = (struct u16550_s*)arg; - if (!user) - { - set_errno(EINVAL); - ret = ERROR; - } - else - { - memcpy(user, dev, sizeof(struct u16550_s)); - } - } - break; - - case TIOCSBRK: /* BSD compatibility: Turn break on, unconditionally */ - { - irqstate_t flags = irqsave(); - u16550_enablebreaks(priv, true); - irqrestore(flags); - } - break; - - case TIOCCBRK: /* BSD compatibility: Turn break off, unconditionally */ - { - irqstate_t flags; - flags = irqsave(); - u16550_enablebreaks(priv, false); - irqrestore(flags); - } - break; - - default: - set_errno(ENOTTY); - ret = ERROR; - break; - } - - return ret; -} - -/**************************************************************************** - * Name: u16550_receive - * - * Description: - * Called (usually) from the interrupt level to receive one - * character from the UART. Error bits associated with the - * receipt are provided in the return 'status'. - * - ****************************************************************************/ - -static int u16550_receive(struct uart_dev_s *dev, uint32_t *status) -{ - struct u16550_s *priv = (struct u16550_s*)dev->priv; - uint32_t rbr; - - *status = u16550_serialin(priv, UART_LSR_OFFSET); - rbr = u16550_serialin(priv, UART_RBR_OFFSET); - return rbr; -} - -/**************************************************************************** - * Name: u16550_rxint - * - * Description: - * Call to enable or disable RX interrupts - * - ****************************************************************************/ - -static void u16550_rxint(struct uart_dev_s *dev, bool enable) -{ -#ifndef CONFIG_SUPPRESS_SERIAL_INTS - struct u16550_s *priv = (struct u16550_s*)dev->priv; - if (enable) - { - priv->ier |= UART_IER_ERBFI; - } - else - { - priv->ier &= ~UART_IER_ERBFI; - } - u16550_serialout(priv, UART_IER_OFFSET, priv->ier); -#endif -} - -/**************************************************************************** - * Name: u16550_rxavailable - * - * Description: - * Return true if the receive fifo is not empty - * - ****************************************************************************/ - -static bool u16550_rxavailable(struct uart_dev_s *dev) -{ - struct u16550_s *priv = (struct u16550_s*)dev->priv; - return ((u16550_serialin(priv, UART_LSR_OFFSET) & UART_LSR_DR) != 0); -} - -/**************************************************************************** - * Name: u16550_send - * - * Description: - * This method will send one byte on the UART - * - ****************************************************************************/ - -static void u16550_send(struct uart_dev_s *dev, int ch) -{ - struct u16550_s *priv = (struct u16550_s*)dev->priv; - u16550_serialout(priv, UART_THR_OFFSET, (uart_datawidth_t)ch); -} - -/**************************************************************************** - * Name: u16550_txint - * - * Description: - * Call to enable or disable TX interrupts - * - ****************************************************************************/ - -static void u16550_txint(struct uart_dev_s *dev, bool enable) -{ -#ifndef CONFIG_SUPPRESS_SERIAL_INTS - struct u16550_s *priv = (struct u16550_s*)dev->priv; - irqstate_t flags; - - flags = irqsave(); - if (enable) - { - priv->ier |= UART_IER_ETBEI; - u16550_serialout(priv, UART_IER_OFFSET, priv->ier); - - /* Fake a TX interrupt here by just calling uart_xmitchars() with - * interrupts disabled (note this may recurse). - */ - - uart_xmitchars(dev); - } - else - { - priv->ier &= ~UART_IER_ETBEI; - u16550_serialout(priv, UART_IER_OFFSET, priv->ier); - } - - irqrestore(flags); -#endif -} - -/**************************************************************************** - * Name: u16550_txready - * - * Description: - * Return true if the tranmsit fifo is not full - * - ****************************************************************************/ - -static bool u16550_txready(struct uart_dev_s *dev) -{ - struct u16550_s *priv = (struct u16550_s*)dev->priv; - return ((u16550_serialin(priv, UART_LSR_OFFSET) & UART_LSR_THRE) != 0); -} - -/**************************************************************************** - * Name: u16550_txempty - * - * Description: - * Return true if the transmit fifo is empty - * - ****************************************************************************/ - -static bool u16550_txempty(struct uart_dev_s *dev) -{ - struct u16550_s *priv = (struct u16550_s*)dev->priv; - return ((u16550_serialin(priv, UART_LSR_OFFSET) & UART_LSR_THRE) != 0); -} - -/**************************************************************************** - * Name: u16550_putc - * - * Description: - * Write one character to the UART (polled) - * - ****************************************************************************/ - -static void u16550_putc(struct u16550_s *priv, int ch) -{ - while ((u16550_serialin(priv, UART_LSR_OFFSET) & UART_LSR_THRE) != 0); - u16550_serialout(priv, UART_THR_OFFSET, (uart_datawidth_t)ch); -} - -/**************************************************************************** - * Public Funtions - ****************************************************************************/ - -/**************************************************************************** - * Name: up_earlyserialinit - * - * Description: - * Performs the low level UART initialization early in debug so that the - * serial console will be available during bootup. This must be called - * before uart_serialinit. - * - * NOTE: Configuration of the CONSOLE UART was performed by uart_lowsetup() - * very early in the boot sequence. - * - ****************************************************************************/ - -void up_earlyserialinit(void) -{ - /* Configure all UARTs (except the CONSOLE UART) and disable interrupts */ - -#ifdef CONFIG_16550_UART0 - u16550_disableuartint(&g_uart0priv, NULL); -#endif -#ifdef CONFIG_16550_UART1 - u16550_disableuartint(&g_uart1priv, NULL); -#endif -#ifdef CONFIG_16550_UART2 - u16550_disableuartint(&g_uart2priv, NULL); -#endif -#ifdef CONFIG_16550_UART3 - u16550_disableuartint(&g_uart3priv, NULL); -#endif - - /* Configuration whichever one is the console */ - -#ifdef CONSOLE_DEV - CONSOLE_DEV.isconsole = true; - u16550_setup(&CONSOLE_DEV); -#endif -} - -/**************************************************************************** - * Name: up_serialinit - * - * Description: - * Register serial console and serial ports. This assumes that - * up_earlyserialinit was called previously. - * - ****************************************************************************/ - -void up_serialinit(void) -{ -#ifdef CONSOLE_DEV - (void)uart_register("/dev/console", &CONSOLE_DEV); -#endif -#ifdef TTYS0_DEV - (void)uart_register("/dev/ttyS0", &TTYS0_DEV); -#endif -#ifdef TTYS1_DEV - (void)uart_register("/dev/ttyS1", &TTYS1_DEV); -#endif -#ifdef TTYS2_DEV - (void)uart_register("/dev/ttyS2", &TTYS2_DEV); -#endif -#ifdef TTYS3_DEV - (void)uart_register("/dev/ttyS3", &TTYS3_DEV); -#endif -} - -/**************************************************************************** - * Name: up_putc - * - * Description: - * Provide priority, low-level access to support OS debug writes - * - ****************************************************************************/ - -#ifdef HAVE_16550_CONSOLE -int up_putc(int ch) -{ - struct u16550_s *priv = (struct u16550_s*)CONSOLE_DEV.priv; -#ifndef CONFIG_SUPPRESS_SERIAL_INTS - uart_datawidth_t ier; - - u16550_disableuartint(priv, &ier); -#endif - - /* Check for LF */ - - if (ch == '\n') - { - /* Add CR */ - - u16550_putc(priv, '\r'); - } - - u16550_putc(priv, ch); -#ifndef CONFIG_SUPPRESS_SERIAL_INTS - u16550_restoreuartint(priv, ier); -#endif - return ch; -} -#endif - -#endif /* CONFIG_16550_UART */ |