diff options
Diffstat (limited to 'nuttx/arch/arm/src/dm320/dm320_serial.c')
| -rw-r--r-- | nuttx/arch/arm/src/dm320/dm320_serial.c | 725 |
1 files changed, 725 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/dm320/dm320_serial.c b/nuttx/arch/arm/src/dm320/dm320_serial.c new file mode 100644 index 000000000..8051393cf --- /dev/null +++ b/nuttx/arch/arm/src/dm320/dm320_serial.c @@ -0,0 +1,725 @@ +/************************************************************ + * dm320/dm320_serial.c + * + * Copyright (C) 2007 Gregory Nutt. All rights reserved. + * Author: Gregory Nutt <spudmonkey@racsa.co.cr> + * + * 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 Gregory Nutt 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 <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.h> +#include <arch/serial.h> +#include "up_arch.h" +#include "os_internal.h" +#include "up_internal.h" + +/************************************************************ + * Definitions + ************************************************************/ + +#define BASE_BAUD 115200 + +/************************************************************ + * Private Types + ************************************************************/ + +struct up_dev_s +{ + uint32 uartbase; /* Base address of UART + * registers */ + uint32 baud; /* Configured baud */ + uint16 msr; /* Saved MSR value */ + ubyte irq; /* IRQ associated with + * this UART */ + ubyte parity; /* 0=none, 1=odd, 2=even */ + ubyte bits; /* Number of bits (7 or 8) */ + boolean stopbits2; /* TRUE: Configure with 2 + * stop bits instead of 1 */ +}; + +/************************************************************ + * Private Function Prototypes + ************************************************************/ + +static int up_setup(struct uart_dev_s *dev); +static void up_shutdown(struct uart_dev_s *dev); +static int up_interrupt(int irq, void *context); +static int up_ioctl(struct file *filep, int cmd, unsigned long arg); +static int up_receive(struct uart_dev_s *dev, uint32 *status); +static void up_rxint(struct uart_dev_s *dev, boolean enable); +static boolean up_rxfifonotempty(struct uart_dev_s *dev); +static void up_send(struct uart_dev_s *dev, int ch); +static void up_txint(struct uart_dev_s *dev, boolean enable); +static boolean up_txfifonotfull(struct uart_dev_s *dev); +static boolean up_txfifoempty(struct uart_dev_s *dev); + +/************************************************************ + * Private Variables + ************************************************************/ + +struct uart_ops_s g_uart_ops = +{ + .setup = up_setup, + .shutdown = up_shutdown, + .handler = up_interrupt, + .ioctl = up_ioctl, + .receive = up_receive, + .rxint = up_rxint, + .rxfifonotempty = up_rxfifonotempty, + .send = up_send, + .txint = up_txint, + .txfifonotfull = up_txfifonotfull, + .txfifoempty = up_txfifoempty, +}; + +/* I/O buffers */ + +static char g_uart0rxbuffer[CONFIG_UART0_RXBUFSIZE]; +static char g_uart0txbuffer[CONFIG_UART0_TXBUFSIZE]; +static char g_uart1rxbuffer[CONFIG_UART1_RXBUFSIZE]; +static char g_uart1txbuffer[CONFIG_UART1_TXBUFSIZE]; + +/* This describes the state of the DM320 uart0 port. */ + +static struct up_dev_s g_uart0priv = +{ + .uartbase = DM320_UART0_REGISTER_BASE, + .baud = CONFIG_UART0_BAUD, + .parity = CONFIG_UART0_PARITY, + .bits = CONFIG_UART0_BITS, + .stopbits2 = CONFIG_UART0_2STOP, +}; + +static uart_dev_t g_uart0port = +{ + .irq = DM320_IRQ_UART0, + .recv = + { + .size = CONFIG_UART0_RXBUFSIZE, + .buffer = g_uart0rxbuffer, + }, + .xmit = + { + .size = CONFIG_UART0_TXBUFSIZE, + .buffer = g_uart0txbuffer, + }, + .ops = &g_uart_ops, + .priv = &g_uart0priv, +}; + +/* This describes the state of the DM320 uart1 port. */ + +static struct up_dev_s g_uart1priv = +{ + .uartbase = DM320_UART1_REGISTER_BASE, + .baud = CONFIG_UART1_BAUD, + .parity = CONFIG_UART1_PARITY, + .bits = CONFIG_UART1_BITS, + .stopbits2 = CONFIG_UART1_2STOP, +}; + +static uart_dev_t g_uart1port = +{ + .irq = DM320_IRQ_UART1, + .recv = + { + .size = CONFIG_UART1_RXBUFSIZE, + .buffer = g_uart1rxbuffer, + }, + .xmit = + { + .size = CONFIG_UART1_TXBUFSIZE, + .buffer = g_uart1txbuffer, + }, + .ops = &g_uart_ops, + .priv = &g_uart1priv, +}; + +/* Now, which one with be tty0/console and which tty1? */ + +#ifdef CONFIG_SERIAL_IRDA_CONSOLE +# define CONSOLE_DEV g_uart1port +# define TTYS0_DEV g_uart1port +# define TTYS1_DEV g_uart0port +#else +# define CONSOLE_DEV g_uart0port +# define TTYS0_DEV g_uart0port +# define TTYS1_DEV g_uart1port +#endif + +/************************************************************ + * Private Functions + ************************************************************/ + +/************************************************************ + * Name: up_serialin + ************************************************************/ + +static inline uint16 up_serialin(struct up_dev_s *priv, uint32 offset) +{ + return getreg16(priv->uartbase + offset); +} + +/************************************************************ + * Name: up_serialout + ************************************************************/ + +static inline void up_serialout(struct up_dev_s *priv, uint32 offset, uint16 value) +{ + putreg16(value, priv->uartbase + offset); +} + +/************************************************************ + * Name: up_disableuartint + ************************************************************/ + +static inline void up_disableuartint(struct up_dev_s *priv, uint16 *msr) +{ + if (msr) + { + *msr = priv->msr & UART_MSR_ALLIE; + } + + priv->msr &= ~UART_MSR_ALLIE; + up_serialout(priv, UART_MSR, priv->msr); +} + +/************************************************************ + * Name: up_restoreuartint + ************************************************************/ + +static inline void up_restoreuartint(struct up_dev_s *priv, uint16 msr) +{ + priv->msr |= msr & UART_MSR_ALLIE; + up_serialout(priv, UART_MSR, priv->msr); +} + +/************************************************************ + * Name: up_waittxfifonotfull + ************************************************************/ + +static inline void up_waittxfifonotfull(struct up_dev_s *priv) +{ + int tmp; + + for (tmp = 1000 ; tmp > 0 ; tmp--) + { + if ((up_serialin(priv, UART_SR) & UART_SR_TFTI) != 0) + { + break; + } + } +} + +/************************************************************ + * Name: up_enablebreaks + ************************************************************/ + +static inline void up_enablebreaks(struct up_dev_s *priv, boolean enable) +{ + uint16 lcr = up_serialin(priv, UART_LCR); + if (enable) + { + lcr |= UART_LCR_BOC; + } + else + { + lcr &= ~UART_LCR_BOC; + } + up_serialout(priv, UART_LCR, lcr); +} + +/************************************************************ + * Name: up_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 up_setup(struct uart_dev_s *dev) +{ +#ifdef CONFIG_SUPPRESS_UART_CONFIG + struct up_dev_s *priv = (struct up_dev_s*)dev->priv; + uint16 brsr; + + /* Clear fifos */ + + up_serialout(priv, UART_DM320_RFCR, 0x8000); + up_serialout(priv, UART_DM320_TFCR, 0x8000); + + /* Set rx and tx triggers */ + + up_serialout(priv, UART_DM320_RFCR, UART_RFCR_RTL_1); + up_serialout(priv, UART_DM320_TFCR, UART_TFCR_TTL_16); + + /* Set up the MSR */ + + priv->msr = up_serialin(priv, UART_MSR); + if (priv->bits == 7) + { + priv->msr |= UART_DATABIT_7; + } + else + { + priv->msr &= ~UART_MSR_CLS; + } + + if (priv->stopbits2) + { + priv->msr |= UART_STOPBIT_2; + } + else + { + priv->msr &= ~UART_MSR_SBLS; + } + + if (priv->parity == 1) + { + priv->msr |= UART_ODDPARITY; + } + else if (priv->parity == 2) + { + priv->msr |= UART_EVENPARITY; + } + else + { + priv->msr &= ~(UART_MSR_PSB|UART_MSR_PEB); + } + + /* Set up the BRSR */ + + switch (dev->baud) + { + case 2400: + brsr = UART_BAUD_2400; + break; + case 4800: + brsr = UART_BAUD_4800; + break; + default: + case 9600: + brsr = UART_BAUD_9600; + break; + case 14400: + brsr = UART_BAUD_14400; + break; + case 19200: + brsr = UART_BAUD_19200; + break; + case 28800: + brsr = UART_BAUD_28800; + break; + case 3840: + brsr = UART_BAUD_38400; + break; + case 57600: + brsr = UART_BAUD_57600; + break; + case 115200: + brsr = UART_BAUD_115200; + break; + case 230400: + brsr = UART_BAUD_230400; + break; + case 460800: + brsr = UART_BAUD_460800; + break; + case 921600: + brsr = UART_BAUD_921600; + break; + } + + /* Setup the new UART configuration */ + + up_serialout(priv,UART_MSR, priv->msr); + up_serialout(priv, UART_DM320_BRSR, brsr); + up_enablebreaks(priv, FALSE); +#endif + return OK; +} + +/************************************************************ + * Name: up_shutdown + * + * Description: + * Disable the UART. This method is called when the serial + * port is closed + * + ************************************************************/ + +static void up_shutdown(struct uart_dev_s *dev) +{ + struct up_dev_s *priv = (struct up_dev_s*)dev->priv; + up_disableuartint(priv, NULL); +} + +/************************************************************ + * Name: up_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 approprite + * uart_dev_s structure in order to call these functions. + * + ************************************************************/ + +static int up_interrupt(int irq, void *context) +{ + struct uart_dev_s *dev = NULL; + struct up_dev_s *priv; + uint16 status; + int passes = 0; + + if (g_uart1port.irq == irq) + { + dev = &g_uart1port; + } + else if (g_uart0port.irq == irq) + { + dev = &g_uart0port; + } + else + { + PANIC(OSERR_INTERNAL); + } + priv = (struct up_dev_s*)dev->priv; + + /* Loop until there are no characters to be transferred or, + * until we have been looping for a long time. + */ + + for(;;) + { + /* Get the current UART status and check for loop + * termination conditions + */ + + status = up_serialin(priv, UART_SR); + status &= (UART_SR_RFTI | UART_SR_TFTI); + + if (status == 0 || passes > 256) + { + return OK; + } + + /* Handline incoming, receive bytes */ + + if (status & UART_SR_RFTI) + { + uart_recvchars(dev); + } + + /* Handle outgoing, transmit bytes */ + + if (status & UART_SR_TFTI) + { + uart_xmitchars(dev); + } + + /* Keep track of how many times we do this in case there + * is some hardware failure condition. + */ + + passes++; + } +} + +/************************************************************ + * Name: up_ioctl + * + * Description: + * All ioctl calls will be routed through this method + * + ************************************************************/ + +static int up_ioctl(struct file *filep, int cmd, unsigned long arg) +{ + struct inode *inode = filep->f_inode; + struct uart_dev_s *dev = inode->i_private; + struct up_dev_s *priv = (struct up_dev_s*)dev->priv; + int ret = OK; + + switch (cmd) + { + case TIOCSERGSTRUCT: + { + struct up_dev_s *user = (struct up_dev_s*)arg; + if (!user) + { + *get_errno_ptr() = EINVAL; + ret = ERROR; + } + else + { + memcpy(user, dev, sizeof(struct up_dev_s)); + } + } + break; + + case TIOCSBRK: /* BSD compatibility: Turn break on, unconditionally */ + { + irqstate_t flags = irqsave(); + up_enablebreaks(priv, TRUE); + irqrestore(flags); + } + break; + + case TIOCCBRK: /* BSD compatibility: Turn break off, unconditionally */ + { + irqstate_t flags; + flags = irqsave(); + up_enablebreaks(priv, FALSE); + irqrestore(flags); + } + break; + + default: + *get_errno_ptr() = ENOTTY; + ret = ERROR; + break; + } + + return ret; +} + +/************************************************************ + * Name: up_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 the return 'status'. + * + ************************************************************/ + +static int up_receive(struct uart_dev_s *dev, uint32 *status) +{ + struct up_dev_s *priv = (struct up_dev_s*)dev->priv; + uint16 dtrr; + + dtrr = up_serialin(priv, UART_DTRR); + *status = dtrr; + return dtrr & UART_DTRR_DTR_MASK; +} + +/************************************************************ + * Name: up_rxint + * + * Description: + * Call to enable or disable RX interrupts + * + ************************************************************/ + +static void up_rxint(struct uart_dev_s *dev, boolean enable) +{ + struct up_dev_s *priv = (struct up_dev_s*)dev->priv; + if (enable) + { +#ifndef CONFIG_SUPPRESS_SERIAL_INTS + priv->msr |= UART_MSR_RFTIE; +#endif + } + else + { + priv->msr &= ~UART_MSR_RFTIE; + } + up_serialout(priv, UART_MSR, priv->msr); +} + +/************************************************************ + * Name: up_rxfifonotempty + * + * Description: + * Return TRUE if the receive fifo is not empty + * + ************************************************************/ + +static boolean up_rxfifonotempty(struct uart_dev_s *dev) +{ + struct up_dev_s *priv = (struct up_dev_s*)dev->priv; + return ((up_serialin(priv, UART_SR) & UART_SR_RFNEF) != 0); +} + +/************************************************************ + * Name: up_send + * + * Description: + * This method will send one byte on the UART + * + ************************************************************/ + +static void up_send(struct uart_dev_s *dev, int ch) +{ + struct up_dev_s *priv = (struct up_dev_s*)dev->priv; + up_serialout(priv, UART_DTRR, (uint16)ch); +} + +/************************************************************ + * Name: up_txint + * + * Description: + * Call to enable or disable TX interrupts + * + ************************************************************/ + +static void up_txint(struct uart_dev_s *dev, boolean enable) +{ + struct up_dev_s *priv = (struct up_dev_s*)dev->priv; + if (enable) + { +#ifndef CONFIG_SUPPRESS_SERIAL_INTS + priv->msr |= UART_MSR_TFTIE; +#endif + } + else + { + priv->msr &= ~UART_MSR_TFTIE; + } + up_serialout(priv, UART_MSR, priv->msr); +} + +/************************************************************ + * Name: up_txfifonotfull + * + * Description: + * Return TRUE if the tranmsit fifo is not full + * + ************************************************************/ + +static boolean up_txfifonotfull(struct uart_dev_s *dev) +{ + struct up_dev_s *priv = (struct up_dev_s*)dev->priv; + return ((up_serialin(priv, UART_SR) & UART_SR_TFTI) != 0); +} + +/************************************************************ + * Name: up_txfifoempty + * + * Description: + * Return TRUE if the transmit fifo is empty + * + ************************************************************/ + +static boolean up_txfifoempty(struct uart_dev_s *dev) +{ + struct up_dev_s *priv = (struct up_dev_s*)dev->priv; + return ((up_serialin(priv, UART_SR) & UART_SR_TREF) == 0); +} + +/************************************************************ + * Public Funtions + ************************************************************/ + +/************************************************************ + * Name: up_serialinit + * + * 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 up_serialinit. + * + ************************************************************/ + +void up_earlyserialinit(void) +{ + up_disableuartint(TTYS0_DEV.priv, NULL); + up_disableuartint(TTYS1_DEV.priv, NULL); + + CONSOLE_DEV.isconsole = TRUE; + up_setup(&CONSOLE_DEV); +} + +/************************************************************ + * Name: up_serialinit + * + * Description: + * Register serial console and serial ports. This assumes + * that up_earlyserialinit was called previously. + * + ************************************************************/ + +void up_serialinit(void) +{ + (void)uart_register("/dev/console", &CONSOLE_DEV); + (void)uart_register("/dev/ttyS0", &TTYS0_DEV); + (void)uart_register("/dev/ttyS1", &TTYS1_DEV); +} + +/************************************************************ + * Name: up_putc + * + * Description: + * Provide priority, low-level access to support OS debug + * writes + * + ************************************************************/ + +int up_putc(int ch) +{ + struct up_dev_s *priv = (struct up_dev_s*)CONSOLE_DEV.priv; + uint16 ier; + + up_disableuartint(priv, &ier); + up_waittxfifonotfull(priv); + up_serialout(priv, UART_DTRR, (uint16)ch); + + /* Check for LF */ + + if (ch == '\n') + { + /* Add CR */ + + up_waittxfifonotfull(priv); + up_serialout(priv, UART_DTRR, '\r'); + } + + up_waittxfifonotfull(priv); + up_restoreuartint(priv, ier); + return ch; +} + |