/**************************************************************************** * arch/arm/src/str71x/str71x_serial.c * * Copyright (C) 2008-2009, 2012-2013 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include "chip.h" #include "up_arch.h" #include "up_internal.h" #include "os_internal.h" #include "str71x_internal.h" /**************************************************************************** * Pre-procesor Definitions ****************************************************************************/ /* Some sanity checks *******************************************************/ /* Is there a UART enabled? */ #if !defined(CONFIG_STR71X_UART0) && !defined(CONFIG_STR71X_UART1) && \ !defined(CONFIG_STR71X_UART2) && !defined(CONFIG_STR71X_UART3) # error "No UARTs enabled" #endif /* Is there a serial console? */ #if defined(CONFIG_UART0_SERIAL_CONSOLE) || defined(CONFIG_UART1_SERIAL_CONSOLE) ||\ defined(CONFIG_UART2_SERIAL_CONSOLE) || defined(CONFIG_UART3_SERIAL_CONSOLE) # define HAVE_CONSOLE 1 #else # undef HAVE_CONSOLE #endif /* Did the user select a priority? */ #ifndef CONFIG_UART_PRI # define CONFIG_UART_PRI 1 #elif CONFIG_UART_PRI <= 1 || CONFIG_UART_PRI > 15 # error "CONFIG_UART_PRI is out of range" #endif /* If we are not using the serial driver for the console, then we * still must provide some minimal implementation of up_putc(). */ #ifdef USE_SERIALDRIVER /* Which UART with be tty0/console and which tty1? tty2? tty3? */ #if defined(CONFIG_UART0_SERIAL_CONSOLE) || !defined(HAVE_CONSOLE) # ifdef HAVE_CONSOLE # ifndef CONFIG_STR71X_UART0 # error "UART0 not selected, cannot be console" # endif # define CONSOLE_DEV g_uart0port /* UART0 is console */ # endif # define TTYS0_DEV g_uart0port /* UART0 is tty0 */ # if CONFIG_STR71X_UART1 # define TTYS1_DEV g_uart1port /* UART1 is tty1 */ # if CONFIG_STR71X_UART2 # define TTYS2_DEV g_uart2port /* UART2 is tty2 */ # if CONFIG_STR71X_UART3 # define TTYS3_DEV g_uart3port /* UART3 is tty3 */ # endif # elif CONFIG_STR71X_UART3 # define TTYS2_DEV g_uart3port /* UART3 is tty2 */ # endif # elif CONFIG_STR71X_UART2 # define TTYS1_DEV g_uart2port /* UART2 is tty1 */ # if CONFIG_STR71X_UART3 # define TTYS2_DEV g_uart3port /* UART3 is tty2 */ # endif # elif CONFIG_STR71X_UART3 # define TTYS1_DEV g_uart3port /* UART3 is tty1 */ # endif #elif defined(CONFIG_UART1_SERIAL_CONSOLE) # ifndef CONFIG_STR71X_UART1 # error "UART1 not selected, cannot be console" # endif # define CONSOLE_DEV g_uart1port /* UART1 is console */ # define TTYS0_DEV g_uart1port /* UART1 is tty0 */ # if CONFIG_STR71X_UART0 # define TTYS1_DEV g_uart0port /* UART0 is tty1 */ # if CONFIG_STR71X_UART2 # define TTYS2_DEV g_uart2port /* UART2 is tty2 */ # if CONFIG_STR71X_UART3 # define TTYS3_DEV g_uart3port /* UART3 is tty3 */ # endif # elif CONFIG_STR71X_UART3 # define TTYS2_DEV g_uart3port /* UART3 is tty2 */ # endif # elif CONFIG_STR71X_UART2 # define TTYS1_DEV g_uart2port /* UART2 is tty1 */ # if CONFIG_STR71X_UART3 # define TTYS2_DEV g_uart3port /* UART3 is tty2 */ # endif # elif CONFIG_STR71X_UART3 # define TTYS1_DEV g_uart3port /* UART3 is tty1 */ # endif #elif defined(CONFIG_UART2_SERIAL_CONSOLE) # ifndef CONFIG_STR71X_UART2 # error "UART2 not selected, cannot be console" # endif # define CONSOLE_DEV g_uart2port /* UART2 is console */ # define TTYS0_DEV g_uart2port /* UART2 is tty0 */ # if CONFIG_STR71X_UART0 # define TTYS1_DEV g_uart0port /* UART0 is tty1 */ # if CONFIG_STR71X_UART1 # define TTYS2_DEV g_uart1port /* UART1 is tty2 */ # if CONFIG_STR71X_UART3 # define TTYS3_DEV g_uart3port /* UART3 is tty3 */ # endif # elif CONFIG_STR71X_UART3 # define TTYS2_DEV g_uart3port /* UART3 is tty2 */ # endif # elif CONFIG_STR71X_UART1 # define TTYS1_DEV g_uart1port /* UART1 is tty1 */ # if CONFIG_STR71X_UART3 # define TTYS2_DEV g_uart3port /* UART3 is tty2 */ # endif # elif CONFIG_STR71X_UART3 # define TTYS1_DEV g_uart3port /* UART3 is tty1 */ # endif #elif defined(CONFIG_UART3_SERIAL_CONSOLE) # ifndef CONFIG_STR71X_UART3 # error "UART3 not selected, cannot be console" # endif # define CONSOLE_DEV g_uart3port /* UART3 is console */ # define TTYS0_DEV g_uart3port /* UART3 is tty0 */ # if CONFIG_STR71X_UART0 # define TTYS1_DEV g_uart0port /* UART0 is tty1 */ # if CONFIG_STR71X_UART1 # define TTYS2_DEV g_uart1port /* UART1 is tty2 */ # if CONFIG_STR71X_UART2 # define TTYS3_DEV g_uart2port /* UART2 is tty3 */ # endif # elif CONFIG_STR71X_UART2 # define TTYS2_DEV g_uart2port /* UART2 is tty2 */ # endif # elif CONFIG_STR71X_UART1 # define TTYS1_DEV g_uart1port /* UART1 is tty1 */ # if CONFIG_STR71X_UART2 # define TTYS2_DEV g_uart2port /* UART2 is tty2 */ # endif # elif CONFIG_STR71X_UART2 # define TTYS1_DEV g_uart2port /* UART2 is tty1 */ # endif #else # warning "No CONFIG_UARTn_SERIAL_CONSOLE Setting" #endif /* Select RX interrupt enable bits. There are two models: (1) We interrupt * when each character is received. Or, (2) we interrupt when either the Rx * FIFO is half full, OR a timeout occurs with data in the RX FIFO. The * later does not work because there seems to be a disconnect -- we can get * the FIFO half full interrupt with no data in the RX buffer. */ #if 1 # define RXENABLE_BITS (STR71X_UARTIER_RHF|STR71X_UARTIER_TIMEOUTNE) #else # define RXENABLE_BITS STR71X_UARTIER_RNE #endif /* Which ever model is used, there seems to be some timing disconnects between * Rx FIFO not full and Rx FIFO half full indications. Best bet is to use * both. */ #define RXAVAILABLE_BITS (STR71X_UARTSR_RNE|STR71X_UARTSR_RHF) /**************************************************************************** * Private Types ****************************************************************************/ struct up_dev_s { uint32_t uartbase; /* Base address of UART registers */ uint32_t baud; /* Configured baud */ uint16_t ier; /* Saved IER value */ uint16_t sr; /* Saved SR value (only used during interrupt processing) */ uint8_t irq; /* IRQ associated with this UART */ 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 */ }; /**************************************************************************** * Private Function Prototypes ****************************************************************************/ /* Internal Helpers */ static inline uint16_t up_serialin(struct up_dev_s *priv, int offset); static inline void up_serialout(struct up_dev_s *priv, int offset, uint16_t value); static inline void up_disableuartint(struct up_dev_s *priv, uint16_t *ier); static inline void up_restoreuartint(struct up_dev_s *priv, uint16_t ier); #ifdef HAVE_CONSOLE static inline void up_waittxnotfull(struct up_dev_s *priv); #endif /* Serial Driver Methods */ static int up_setup(struct uart_dev_s *dev); static void up_shutdown(struct uart_dev_s *dev); static int up_attach(struct uart_dev_s *dev); static void up_detach(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_t *status); static void up_rxint(struct uart_dev_s *dev, bool enable); static bool up_rxavailable(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, bool enable); static bool up_txready(struct uart_dev_s *dev); static bool up_txempty(struct uart_dev_s *dev); /**************************************************************************** * Private Variables ****************************************************************************/ static const struct uart_ops_s g_uart_ops = { .setup = up_setup, .shutdown = up_shutdown, .attach = up_attach, .detach = up_detach, .ioctl = up_ioctl, .receive = up_receive, .rxint = up_rxint, .rxavailable = up_rxavailable, #ifdef CONFIG_SERIAL_IFLOWCONTROL .rxflowcontrol = NULL, #endif .send = up_send, .txint = up_txint, .txready = up_txready, .txempty = up_txempty, }; /* I/O buffers */ #ifdef CONFIG_STR71X_UART0 static char g_uart0rxbuffer[CONFIG_UART0_RXBUFSIZE]; static char g_uart0txbuffer[CONFIG_UART0_TXBUFSIZE]; #endif #ifdef CONFIG_STR71X_UART1 static char g_uart1rxbuffer[CONFIG_UART1_RXBUFSIZE]; static char g_uart1txbuffer[CONFIG_UART1_TXBUFSIZE]; #endif #ifdef CONFIG_STR71X_UART2 static char g_uart2rxbuffer[CONFIG_UART1_RXBUFSIZE]; static char g_uart2txbuffer[CONFIG_UART1_TXBUFSIZE]; #endif #ifdef CONFIG_STR71X_UART3 static char g_uart3rxbuffer[CONFIG_UART1_RXBUFSIZE]; static char g_uart3txbuffer[CONFIG_UART1_TXBUFSIZE]; #endif /* This describes the state of the STR71X uart0 port. */ #ifdef CONFIG_STR71X_UART0 static struct up_dev_s g_uart0priv = { .uartbase = STR71X_UART0_BASE, .baud = CONFIG_UART0_BAUD, .irq = STR71X_IRQ_UART0, .parity = CONFIG_UART0_PARITY, .bits = CONFIG_UART0_BITS, .stopbits2 = CONFIG_UART0_2STOP, }; static uart_dev_t g_uart0port = { .recv = { .size = CONFIG_UART0_RXBUFSIZE, .buffer = g_uart0rxbuffer, }, .xmit = { .size = CONFIG_UART0_TXBUFSIZE, .buffer = g_uart0txbuffer, }, .ops = &g_uart_ops, .priv = &g_uart0priv, }; #endif /* This describes the state of the STR71X uart1 port. */ #ifdef CONFIG_STR71X_UART1 static struct up_dev_s g_uart1priv = { .uartbase = STR71X_UART1_BASE, .baud = CONFIG_UART1_BAUD, .irq = STR71X_IRQ_UART1, .parity = CONFIG_UART1_PARITY, .bits = CONFIG_UART1_BITS, .stopbits2 = CONFIG_UART1_2STOP, }; static uart_dev_t g_uart1port = { .recv = { .size = CONFIG_UART1_RXBUFSIZE, .buffer = g_uart1rxbuffer, }, .xmit = { .size = CONFIG_UART1_TXBUFSIZE, .buffer = g_uart1txbuffer, }, .ops = &g_uart_ops, .priv = &g_uart1priv, }; #endif /* This describes the state of the STR71X uart2 port. */ #ifdef CONFIG_STR71X_UART2 static struct up_dev_s g_uart2priv = { .uartbase = STR71X_UART2_BASE, .baud = CONFIG_UART2_BAUD, .irq = STR71X_IRQ_UART2, .parity = CONFIG_UART2_PARITY, .bits = CONFIG_UART2_BITS, .stopbits2 = CONFIG_UART2_2STOP, }; static uart_dev_t g_uart2port = { .recv = { .size = CONFIG_UART2_RXBUFSIZE, .buffer = g_uart2rxbuffer, }, .xmit = { .size = CONFIG_UART2_TXBUFSIZE, .buffer = g_uart2txbuffer, }, .ops = &g_uart_ops, .priv = &g_uart2priv, }; #endif /* This describes the state of the STR71X uart3 port. */ #ifdef CONFIG_STR71X_UART3 static struct up_dev_s g_uart3priv = { .uartbase = STR71X_UART3_BASE, .baud = CONFIG_UART3_BAUD, .irq = STR71X_IRQ_UART3, .parity = CONFIG_UART3_PARITY, .bits = CONFIG_UART3_BITS, .stopbits2 = CONFIG_UART3_2STOP, }; static uart_dev_t g_uart3port = { .recv = { .size = CONFIG_UART3_RXBUFSIZE, .buffer = g_uart3rxbuffer, }, .xmit = { .size = CONFIG_UART3_TXBUFSIZE, .buffer = g_uart3txbuffer, }, .ops = &g_uart_ops, .priv = &g_uart3priv, }; #endif /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: up_serialin ****************************************************************************/ static inline uint16_t up_serialin(struct up_dev_s *priv, int offset) { return getreg16(priv->uartbase + offset); } /**************************************************************************** * Name: up_serialout ****************************************************************************/ static inline void up_serialout(struct up_dev_s *priv, int offset, uint16_t value) { putreg16(value, priv->uartbase + offset); } /**************************************************************************** * Name: up_disableuartint ****************************************************************************/ static inline void up_disableuartint(struct up_dev_s *priv, uint16_t *ier) { if (ier) { *ier = priv->ier; } priv->ier = 0; up_serialout(priv, STR71X_UART_IER_OFFSET, 0); } /**************************************************************************** * Name: up_restoreuartint ****************************************************************************/ static inline void up_restoreuartint(struct up_dev_s *priv, uint16_t ier) { priv->ier = ier; up_serialout(priv, STR71X_UART_IER_OFFSET, ier); } /**************************************************************************** * Name: up_waittxnotfull ****************************************************************************/ #ifdef HAVE_CONSOLE static inline void up_waittxnotfull(struct up_dev_s *priv) { int tmp; /* Limit how long we will wait for the TX available condition */ for (tmp = 1000 ; tmp > 0 ; tmp--) { /* Check TX FIFO is full */ if ((up_serialin(priv, STR71X_UART_SR_OFFSET) & STR71X_UARTSR_TF) == 0) { /* The TX FIFO is not full... return */ break; } } } #endif /**************************************************************************** * 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) { #ifndef CONFIG_SUPPRESS_UART_CONFIG struct up_dev_s *priv = (struct up_dev_s*)dev->priv; uint32_t divisor; uint32_t baud; uint16_t cr; /* Set the BAUD rate */ divisor = 16 * priv->baud; baud = (STR71X_PCLK1 + divisor/2) / divisor; up_serialout(priv, STR71X_UART_BR_OFFSET, baud); /* Get mode setting */ cr = STR71X_UARTCR_RUN|STR71X_UARTCR_RXENABLE|STR71X_UARTCR_FIFOENABLE; if (priv->bits == 7) { DEBUGASSERT(priv->parity != 0); cr |= STR71X_UARTCR_MODE7BITP; } else if (priv->bits == 8) { if (priv->parity) { cr |= STR71X_UARTCR_MODE8BITP; } else { cr |= STR71X_UARTCR_MODE8BIT; } } else { DEBUGASSERT(priv->bits == 9 && priv->parity == 0); cr |= STR71X_UARTCR_MODE9BIT; } if (priv->parity == 1) { cr |= STR71X_UARTCR_PARITYODD; } if (priv->stopbits2) { cr |= STR71X_UARTCR_STOPBIT20; } else { cr |= STR71X_UARTCR_STOPBIT10; } up_serialout(priv, STR71X_UART_CR_OFFSET, cr); /* Clear FIFOs */ up_serialout(priv, STR71X_UART_TXRSTR_OFFSET, 0xffff); up_serialout(priv, STR71X_UART_RXRSTR_OFFSET, 0xffff); /* We will take RX interrupts on either the FIFO half full or upon * a timeout. The timeout is based upon BAUD rate ticks */ up_serialout(priv, STR71X_UART_TOR_OFFSET, 50); /* Set up the IER */ priv->ier = up_serialin(priv, STR71X_UART_IER_OFFSET); #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_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 up_attach(struct uart_dev_s *dev) { struct up_dev_s *priv = (struct up_dev_s*)dev->priv; int ret; /* Attach and enable the IRQ */ ret = irq_attach(priv->irq, up_interrupt); if (ret == OK) { /* Enable the interrupt (RX and TX interrupts are still disabled * in the UART */ up_enable_irq(priv->irq); #ifdef CONFIG_ARCH_IRQPRIO /* Set the uart interrupt priority (the default value is one) */ up_prioritize_irq(priv->irq, CONFIG_UART_PRI); } #endif return ret; } /**************************************************************************** * Name: up_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 up_detach(struct uart_dev_s *dev) { struct up_dev_s *priv = (struct up_dev_s*)dev->priv; up_disable_irq(priv->irq); irq_detach(priv->irq); } /**************************************************************************** * 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; int passes; bool handled; #ifdef CONFIG_STR71X_UART0 if (g_uart0priv.irq == irq) { dev = &g_uart0port; } else #endif #ifdef CONFIG_STR71X_UART1 if (g_uart1priv.irq == irq) { dev = &g_uart1port; } else #endif #ifdef CONFIG_STR71X_UART2 if (g_uart2priv.irq == irq) { dev = &g_uart2port; } else #endif #ifdef CONFIG_STR71X_UART3 if (g_uart3priv.irq == irq) { dev = &g_uart3port; } else #endif { PANIC(); } priv = (struct up_dev_s*)dev->priv; DEBUGASSERT(priv && dev); /* Loop until there are no characters to be transferred or, * until we have been looping for a long time. */ handled = true; for (passes = 0; passes < 256 && handled; passes++) { handled = false; /* Get the current UART status */ priv->sr = up_serialin(priv, STR71X_UART_SR_OFFSET); /* Handle incoming, receive bytes (with or without timeout) */ if ((priv->sr & RXAVAILABLE_BITS) != 0 && /* Data available in Rx FIFO */ (priv->ier & RXENABLE_BITS) != 0) /* Rx FIFO interrupts enabled */ { /* Rx buffer not empty ... process incoming bytes */ uart_recvchars(dev); handled = true; } /* Handle outgoing, transmit bytes */ if ((priv->sr & STR71X_UARTSR_TF) == 0 && /* Tx FIFO not full */ (priv->ier & STR71X_UARTIER_THE) != 0) /* Tx Half empty interrupt enabled */ { /* Tx FIFO not full ... process outgoing bytes */ uart_xmitchars(dev); handled = true; } } return OK; } /**************************************************************************** * 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) { #ifdef CONFIG_SERIAL_TIOCSERGSTRUCT struct inode *inode = filep->f_inode; struct uart_dev_s *dev = inode->i_private; #endif int ret = OK; switch (cmd) { #ifdef CONFIG_SERIAL_TIOCSERGSTRUCT case TIOCSERGSTRUCT: { struct up_dev_s *user = (struct up_dev_s*)arg; if (!user) { ret = -EINVAL; } else { memcpy(user, dev, sizeof(struct up_dev_s)); } } break; #endif default: ret = -ENOTTY; 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 return 'status'. * ****************************************************************************/ static int up_receive(struct uart_dev_s *dev, uint32_t *status) { struct up_dev_s *priv = (struct up_dev_s*)dev->priv; uint16_t rxbufr; rxbufr = up_serialin(priv, STR71X_UART_RXBUFR_OFFSET); *status = (uint32_t)priv->sr << 16 | rxbufr; return rxbufr & 0xff; } /**************************************************************************** * Name: up_rxint * * Description: * Call to enable or disable RX interrupts * ****************************************************************************/ static void up_rxint(struct uart_dev_s *dev, bool enable) { struct up_dev_s *priv = (struct up_dev_s*)dev->priv; if (enable) { /* Receive an interrupt when the Rx FIFO is half full (or if a timeout * occurs while the Rx FIFO is not empty). */ #ifndef CONFIG_SUPPRESS_SERIAL_INTS priv->ier |= RXENABLE_BITS; #endif } else { priv->ier &= ~RXENABLE_BITS; } up_serialout(priv, STR71X_UART_IER_OFFSET, priv->ier); } /**************************************************************************** * Name: up_rxavailable * * Description: * Return true if the receive fifo is not empty * ****************************************************************************/ static bool up_rxavailable(struct uart_dev_s *dev) { struct up_dev_s *priv = (struct up_dev_s*)dev->priv; return ((up_serialin(priv, STR71X_UART_SR_OFFSET) & RXAVAILABLE_BITS) != 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, STR71X_UART_TXBUFR_OFFSET, (uint16_t)ch); } /**************************************************************************** * Name: up_txint * * Description: * Call to enable or disable TX interrupts * ****************************************************************************/ static void up_txint(struct uart_dev_s *dev, bool enable) { struct up_dev_s *priv = (struct up_dev_s*)dev->priv; if (enable) { /* Set to receive an interrupt when the TX fifo is half emptied */ #ifndef CONFIG_SUPPRESS_SERIAL_INTS priv->ier |= STR71X_UARTSR_THE; #endif } else { /* Disable the TX interrupt */ priv->ier &= ~STR71X_UARTSR_THE; } up_serialout(priv, STR71X_UART_IER_OFFSET, priv->ier); } /**************************************************************************** * Name: up_txready * * Description: * Return true if the tranmsit fifo is not full * ****************************************************************************/ static bool up_txready(struct uart_dev_s *dev) { struct up_dev_s *priv = (struct up_dev_s*)dev->priv; return ((up_serialin(priv, STR71X_UART_SR_OFFSET) & STR71X_UARTSR_TF) == 0); } /**************************************************************************** * Name: up_txempty * * Description: * Return true if the transmit fifo is empty * ****************************************************************************/ static bool up_txempty(struct uart_dev_s *dev) { struct up_dev_s *priv = (struct up_dev_s*)dev->priv; return ((up_serialin(priv, STR71X_UART_SR_OFFSET) & STR71X_UARTSR_TE) != 0); } /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * 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) { /* NOTE: All GPIO configuration for the UARTs was performed in * up_lowsetup */ /* Disable all UARTS */ up_disableuartint(TTYS0_DEV.priv, NULL); #ifdef TTYS1_DEV up_disableuartint(TTYS1_DEV.priv, NULL); #endif #ifdef TTYS2_DEV up_disableuartint(TTYS2_DEV.priv, NULL); #endif #ifdef TTYS3_DEV up_disableuartint(TTYS3_DEV.priv, NULL); #endif /* Configuration whichever one is the console */ #ifdef HAVE_CONSOLE CONSOLE_DEV.isconsole = true; up_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) { /* Register the console */ #ifdef HAVE_CONSOLE (void)uart_register("/dev/console", &CONSOLE_DEV); #endif /* Register all UARTs */ (void)uart_register("/dev/ttyS0", &TTYS0_DEV); #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 * ****************************************************************************/ int up_putc(int ch) { #ifdef HAVE_CONSOLE struct up_dev_s *priv = (struct up_dev_s*)CONSOLE_DEV.priv; uint16_t ier; up_disableuartint(priv, &ier); up_waittxnotfull(priv); up_serialout(priv, STR71X_UART_TXBUFR_OFFSET, (uint16_t)ch); /* Check for LF */ if (ch == '\n') { /* Add CR */ up_waittxnotfull(priv); up_serialout(priv, STR71X_UART_TXBUFR_OFFSET, (uint16_t)'\r'); } up_waittxnotfull(priv); up_restoreuartint(priv, ier); #endif return ch; } #else /* USE_SERIALDRIVER */ /**************************************************************************** * Name: up_putc * * Description: * Provide priority, low-level access to support OS debug writes * ****************************************************************************/ int up_putc(int ch) { #ifdef HAVE_CONSOLE /* Check for LF */ if (ch == '\n') { /* Add CR */ up_lowputc('\r'); } up_lowputc(ch); #endif return ch; } #endif /* USE_SERIALDRIVER */