/**************************************************************************** * arch/arm/src/am335x/am335x_serial.c * * Copyright (C) 2018 Petro Karashchenko. All rights reserved. * Author: Petro Karashchenko * * 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 #ifdef CONFIG_SERIAL_TERMIOS # include #endif #include #include #include #include #include "up_arch.h" #include "up_internal.h" #include "chip.h" #include "chip/am335x_uart.h" #include "am335x_gpio.h" #include "am335x_serial.h" /**************************************************************************** * Pre-processor definitions ****************************************************************************/ /* If we are not using the serial driver for the console, then we still must * provide some minimal implementation of up_putc. */ #if defined(USE_SERIALDRIVER) && defined(HAVE_UART_DEVICE) /* SCLK is the UART input clock. * * Through experimentation, it has been found that the serial clock is * OSC24M */ #define AM335X_SCLK 48000000 /**************************************************************************** * Private Types ****************************************************************************/ struct up_dev_s { uint32_t uartbase; /* Base address of UART registers */ uint32_t baud; /* Configured baud */ uint32_t ier; /* Saved IER value */ 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 ****************************************************************************/ 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 uart_interrupt(int irq, void *context, void *arg); 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 Data ****************************************************************************/ 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_AM335X_UART0 static char g_uart0rxbuffer[CONFIG_UART0_RXBUFSIZE]; static char g_uart0txbuffer[CONFIG_UART0_TXBUFSIZE]; #endif #ifdef CONFIG_AM335X_UART1 static char g_uart1rxbuffer[CONFIG_UART1_RXBUFSIZE]; static char g_uart1txbuffer[CONFIG_UART1_TXBUFSIZE]; #endif #ifdef CONFIG_AM335X_UART2 static char g_uart2rxbuffer[CONFIG_UART2_RXBUFSIZE]; static char g_uart2txbuffer[CONFIG_UART2_TXBUFSIZE]; #endif #ifdef CONFIG_AM335X_UART3 static char g_uart3rxbuffer[CONFIG_UART3_RXBUFSIZE]; static char g_uart3txbuffer[CONFIG_UART3_TXBUFSIZE]; #endif #ifdef CONFIG_AM335X_UART4 static char g_uart4rxbuffer[CONFIG_UART4_RXBUFSIZE]; static char g_uart4txbuffer[CONFIG_UART4_TXBUFSIZE]; #endif #ifdef CONFIG_AM335X_UART5 static char g_uart5rxbuffer[CONFIG_UART5_RXBUFSIZE]; static char g_uart5txbuffer[CONFIG_UART5_TXBUFSIZE]; #endif /* This describes the state of the AM335X UART0 port. */ #ifdef CONFIG_AM335X_UART0 static struct up_dev_s g_uart0priv = { .uartbase = AM335X_UART0_VADDR, .baud = CONFIG_UART0_BAUD, .irq = AM335X_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 AM335X UART1 port. */ #ifdef CONFIG_AM335X_UART1 static struct up_dev_s g_uart1priv = { .uartbase = AM335X_UART1_VADDR, .baud = CONFIG_UART1_BAUD, .handler = uart1_interrupt, .irq = AM335X_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 AM335X UART2 port. */ #ifdef CONFIG_AM335X_UART2 static struct up_dev_s g_uart2priv = { .uartbase = AM335X_UART2_VADDR, .baud = CONFIG_UART2_BAUD, .irq = AM335X_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 AM335X UART3 port. */ #ifdef CONFIG_AM335X_UART3 static struct up_dev_s g_uart3priv = { .uartbase = AM335X_UART3_VADDR, .baud = CONFIG_UART3_BAUD, .irq = AM335X_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 /* This describes the state of the AM335X UART4 port. */ #ifdef CONFIG_AM335X_UART4 static struct up_dev_s g_uart4priv = { .uartbase = AM335X_UART4_VADDR, .baud = CONFIG_UART4_BAUD, .irq = AM335X_IRQ_UART4, .parity = CONFIG_UART4_PARITY, .bits = CONFIG_UART4_BITS, .stopbits2 = CONFIG_UART4_2STOP, }; static uart_dev_t g_uart4port = { .recv = { .size = CONFIG_UART4_RXBUFSIZE, .buffer = g_uart4rxbuffer, }, .xmit = { .size = CONFIG_UART4_TXBUFSIZE, .buffer = g_uart4txbuffer, }, .ops = &g_uart_ops, .priv = &g_uart4priv, }; #endif /* This describes the state of the AM335X UART5 port. */ #ifdef CONFIG_AM335X_UART5 static struct up_dev_s g_uart5priv = { .uartbase = AM335X_UART5_VADDR, .baud = CONFIG_UART5_BAUD, .irq = AM335X_IRQ_UART5, .parity = CONFIG_UART5_PARITY, .bits = CONFIG_UART5_BITS, .stopbits2 = CONFIG_UART5_2STOP, }; static uart_dev_t g_uart5port = { .recv = { .size = CONFIG_UART5_RXBUFSIZE, .buffer = g_uart5rxbuffer, }, .xmit = { .size = CONFIG_UART5_TXBUFSIZE, .buffer = g_uart5txbuffer, }, .ops = &g_uart_ops, .priv = &g_uart5priv, }; #endif /* Which UART with be tty0/console and which tty1-5? The console will always * be ttyS0. If there is no console then will use the lowest numbered UART. */ /* First pick the console and ttys0. This could be any of UART0-5 */ #if defined(CONFIG_UART0_SERIAL_CONSOLE) # define CONSOLE_DEV g_uart0port /* UART0 is console */ # define TTYS0_DEV g_uart0port /* UART0 is ttyS0 */ # define UART0_ASSIGNED 1 #elif defined(CONFIG_UART1_SERIAL_CONSOLE) # define CONSOLE_DEV g_uart1port /* UART1 is console */ # define TTYS0_DEV g_uart1port /* UART1 is ttyS0 */ # define UART1_ASSIGNED 1 #elif defined(CONFIG_UART2_SERIAL_CONSOLE) # define CONSOLE_DEV g_uart2port /* UART2 is console */ # define TTYS0_DEV g_uart2port /* UART2 is ttyS0 */ # define UART2_ASSIGNED 1 #elif defined(CONFIG_UART3_SERIAL_CONSOLE) # define CONSOLE_DEV g_uart3port /* UART3 is console */ # define TTYS0_DEV g_uart3port /* UART3 is ttyS0 */ # define UART3_ASSIGNED 1 #elif defined(CONFIG_UART4_SERIAL_CONSOLE) # define CONSOLE_DEV g_uart4port /* UART4 is console */ # define TTYS0_DEV g_uart4port /* UART4 is ttyS0 */ # define UART4_ASSIGNED 1 #elif defined(CONFIG_UART5_SERIAL_CONSOLE) # define CONSOLE_DEV g_uart5port /* UART5 is console */ # define TTYS5_DEV g_uart5port /* UART5 is ttyS0 */ # define UART5_ASSIGNED 1 #else # undef CONSOLE_DEV /* No console */ # if defined(CONFIG_AM335X_UART0) # define TTYS0_DEV g_uart0port /* UART0 is ttyS0 */ # define UART0_ASSIGNED 1 # elif defined(CONFIG_AM335X_UART1) # define TTYS0_DEV g_uart1port /* UART1 is ttyS0 */ # define UART1_ASSIGNED 1 # elif defined(CONFIG_AM335X_UART2) # define TTYS0_DEV g_uart2port /* UART2 is ttyS0 */ # define UART2_ASSIGNED 1 # elif defined(CONFIG_AM335X_UART3) # define TTYS0_DEV g_uart3port /* UART3 is ttyS0 */ # define UART3_ASSIGNED 1 # elif defined(CONFIG_AM335X_UART4) # define TTYS0_DEV g_uart4port /* UART4 is ttyS0 */ # define UART4_ASSIGNED 1 # elif defined(CONFIG_AM335X_UART5) # define TTYS0_DEV g_uart5port /* UART5 is ttyS0 */ # define UART5_ASSIGNED 1 # endif #endif /* Pick ttys1. This could be any of UART0-5 excluding the console UART. */ #if defined(CONFIG_AM335X_UART0) && !defined(UART0_ASSIGNED) # define TTYS1_DEV g_uart0port /* UART0 is ttyS1 */ # define UART0_ASSIGNED 1 #elif defined(CONFIG_AM335X_UART1) && !defined(UART1_ASSIGNED) # define TTYS1_DEV g_uart1port /* UART1 is ttyS1 */ # define UART1_ASSIGNED 1 #elif defined(CONFIG_AM335X_UART2) && !defined(UART2_ASSIGNED) # define TTYS1_DEV g_uart2port /* UART2 is ttyS1 */ # define UART2_ASSIGNED 1 #elif defined(CONFIG_AM335X_UART3) && !defined(UART3_ASSIGNED) # define TTYS1_DEV g_uart3port /* UART3 is ttyS1 */ # define UART3_ASSIGNED 1 #elif defined(CONFIG_AM335X_UART4) && !defined(UART4_ASSIGNED) # define TTYS1_DEV g_uart4port /* UART4 is ttyS1 */ # define UART4_ASSIGNED 1 #elif defined(CONFIG_AM335X_UART5) && !defined(UART5_ASSIGNED) # define TTYS1_DEV g_uart5port /* UART5 is ttyS1 */ # define UART5_ASSIGNED 1 #endif /* Pick ttys2. This could be one of UART1-5. It can't be UART0 because that * was either assigned as ttyS0 or ttys1. One of UART 1-5 could also be the * console. */ #if defined(CONFIG_AM335X_UART1) && !defined(UART1_ASSIGNED) # define TTYS2_DEV g_uart1port /* UART1 is ttyS2 */ # define UART1_ASSIGNED 1 #elif defined(CONFIG_AM335X_UART2) && !defined(UART2_ASSIGNED) # define TTYS2_DEV g_uart2port /* UART2 is ttyS2 */ # define UART2_ASSIGNED 1 #elif defined(CONFIG_AM335X_UART3) && !defined(UART3_ASSIGNED) # define TTYS2_DEV g_uart3port /* UART3 is ttyS2 */ # define UART3_ASSIGNED 1 #elif defined(CONFIG_AM335X_UART4) && !defined(UART4_ASSIGNED) # define TTYS2_DEV g_uart4port /* UART4 is ttyS2 */ # define UART4_ASSIGNED 1 #elif defined(CONFIG_AM335X_UART5) && !defined(UART5_ASSIGNED) # define TTYS2_DEV g_uart5port /* UART5 is ttyS2 */ # define UART5_ASSIGNED 1 #endif /* Pick ttys3. This could be one of UART2-5. It can't be UART0-1 because * those have already been assigned to ttsyS0, 1, or 2. One of * UART 2-5 could also be the console. */ #if defined(CONFIG_AM335X_UART2) && !defined(UART2_ASSIGNED) # define TTYS3_DEV g_uart2port /* UART2 is ttyS3 */ # define UART2_ASSIGNED 1 #elif defined(CONFIG_AM335X_UART3) && !defined(UART3_ASSIGNED) # define TTYS3_DEV g_uart3port /* UART3 is ttyS3 */ # define UART3_ASSIGNED 1 #elif defined(CONFIG_AM335X_UART4) && !defined(UART4_ASSIGNED) # define TTYS3_DEV g_uart4port /* UART4 is ttyS3 */ # define UART4_ASSIGNED 1 #elif defined(CONFIG_AM335X_UART5) && !defined(UART5_ASSIGNED) # define TTYS3_DEV g_uart5port /* UART5 is ttyS3 */ # define UART5_ASSIGNED 1 #endif /* Pick ttys4. This could be one of UART3-5. It can't be UART0-2 because * those have already been assigned to ttsyS0, 1, 2 or 3. One of * UART 3-5 could also be the console. */ #if defined(CONFIG_AM335X_UART3) && !defined(UART3_ASSIGNED) # define TTYS4_DEV g_uart3port /* UART3 is ttyS4 */ # define UART3_ASSIGNED 1 #elif defined(CONFIG_AM335X_UART4) && !defined(UART4_ASSIGNED) # define TTYS4_DEV g_uart4port /* UART4 is ttyS4 */ # define UART4_ASSIGNED 1 #elif defined(CONFIG_AM335X_UART5) && !defined(UART5_ASSIGNED) # define TTYS4_DEV g_uart5port /* UART5 is ttyS4 */ # define UART5_ASSIGNED 1 #endif /* Pick ttys5. This could be one of UART4-5. It can't be UART0-3 because * those have already been assigned to ttsyS0, 1, 2, 3 or 4. One of * UART 4-5 could also be the console. */ #if defined(CONFIG_AM335X_UART4) && !defined(UART4_ASSIGNED) # define TTYS5_DEV g_uart4port /* UART4 is ttyS5 */ # define UART4_ASSIGNED 1 #elif defined(CONFIG_AM335X_UART5) && !defined(UART5_ASSIGNED) # define TTYS5_DEV g_uart5port /* UART5 is ttyS5 */ # define UART5_ASSIGNED 1 #endif /**************************************************************************** * Inline Functions ****************************************************************************/ /**************************************************************************** * Name: up_serialin ****************************************************************************/ static inline uint32_t up_serialin(struct up_dev_s *priv, int offset) { return getreg32(priv->uartbase + offset); } /**************************************************************************** * Name: up_serialout ****************************************************************************/ static inline void up_serialout(struct up_dev_s *priv, int offset, uint32_t value) { putreg32(value, priv->uartbase + offset); } /**************************************************************************** * Name: up_disableuartint ****************************************************************************/ static inline void up_disableuartint(struct up_dev_s *priv, uint32_t *ier) { if (ier != NULL) { *ier = priv->ier & UART_IER_ALLIE; } priv->ier &= ~UART_IER_ALLIE; up_serialout(priv, AM335X_UART_IER_OFFSET, priv->ier); } /**************************************************************************** * Name: up_restoreuartint ****************************************************************************/ static inline void up_restoreuartint(struct up_dev_s *priv, uint32_t ier) { priv->ier |= ier & UART_IER_ALLIE; up_serialout(priv, AM335X_UART_IER_OFFSET, priv->ier); } /**************************************************************************** * Name: up_enablebreaks ****************************************************************************/ static inline void up_enablebreaks(struct up_dev_s *priv, bool enable) { uint32_t lcr = up_serialin(priv, AM335X_UART_LCR_OFFSET); if (enable) { lcr |= UART_LCR_BC; } else { lcr &= ~UART_LCR_BC; } up_serialout(priv, AM335X_UART_LCR_OFFSET, lcr); } /************************************************************************************ * Name: am335x_uart0config, uart1config, uart2config, ..., uart5config * * Descrption: * Configure the UART * ************************************************************************************/ #ifdef CONFIG_AM335X_UART0 static inline void am335x_uart0config(void) { irqstate_t flags; /* Step 1: Enable power to UART0 */ flags = enter_critical_section(); #warning Missing logic /* Step 2: Enable clocking to UART0 */ #warning Missing logic /* Step 3: Configure I/O pins */ am335x_gpio_config(GPIO_UART0_TXD); am335x_gpio_config(GPIO_UART0_RXD); leave_critical_section(flags); }; #endif #ifdef CONFIG_AM335X_UART1 static inline void am335x_uart1config(void) { irqstate_t flags; /* Step 1: Enable power to UART1 */ flags = enter_critical_section(); #warning Missing logic /* Step 2: Enable clocking to UART1 */ #warning Missing logic /* Step 3: Configure I/O pins */ am335x_gpio_config(GPIO_UART1_TXD); am335x_gpio_config(GPIO_UART1_RXD); leave_critical_section(flags); }; #endif #ifdef CONFIG_AM335X_UART2 static inline void am335x_uart2config(void) { irqstate_t flags; /* Step 1: Enable power to UART2 */ flags = enter_critical_section(); #warning Missing logic /* Step 2: Enable clocking on UART2 */ #warning Missing logic /* Step 3: Configure I/O pins */ am335x_gpio_config(GPIO_UART2_TXD); am335x_gpio_config(GPIO_UART2_RXD); leave_critical_section(flags); }; #endif #ifdef CONFIG_AM335X_UART3 static inline void am335x_uart3config(void) { irqstate_t flags; /* Step 1: Enable power to UART3 */ flags = enter_critical_section(); #warning Missing logic /* Step 2: Enable clocking to UART3 */ #warning Missing logic /* Step 3: Configure I/O pins */ am335x_gpio_config(GPIO_UART3_TXD); am335x_gpio_config(GPIO_UART3_RXD); leave_critical_section(flags); }; #endif #ifdef CONFIG_AM335X_UART4 static inline void am335x_uart4config(void) { irqstate_t flags; /* Step 1: Enable power to UART4 */ flags = enter_critical_section(); #warning Missing logic /* Step 2: Enable clocking to UART4 */ #warning Missing logic /* Step 3: Configure I/O pins */ am335x_gpio_config(GPIO_UART4_TXD); am335x_gpio_config(GPIO_UART4_RXD); leave_critical_section(flags); }; #endif #ifdef CONFIG_AM335X_UART5 static inline void am335x_uart5config(void) { irqstate_t flags; /* Step 1: Enable power to UART5 */ flags = enter_critical_section(); #warning Missing logic /* Step 2: Enable clocking to UART5 */ #warning Missing logic /* Step 3: Configure I/O pins */ am335x_gpio_config(GPIO_UART5_TXD); am335x_gpio_config(GPIO_UART5_RXD); leave_critical_section(flags); }; #endif /************************************************************************************ * Name: am335x_uartdl * * Description: * Select a divider to produce the BAUD from the UART PCLK. * * BAUD = PCLK / (16 * DL), or * DL = PCLK / BAUD / 16 * ************************************************************************************/ static inline uint32_t am335x_uartdl(uint32_t baud) { return AM335X_SCLK / (baud << 4); } /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * 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; uint16_t dl; uint32_t lcr; /* Put UART to disabled mode */ up_serialout(priv, AM335X_UART_MDR1_OFFSET, UART_MDR1_MODE_DISABLE); /* Enter configuration mode and enable access to Latch Divisor DLAB=1 */ up_serialout(priv, AM335X_UART_LCR_OFFSET, UART_LCR_CONFIG_MODE_B); /* Set Divisor values to zero to be able to write FCR correctly */ up_serialout(priv, AM335X_UART_DLH_OFFSET, 0); up_serialout(priv, AM335X_UART_DLL_OFFSET, 0); /* Enable writing FCR[5:4] */ up_serialout(priv, AM335X_UART_EFR_OFFSET, UART_EFR_ENHANCEDEN); /* Exit configuration mode and enable access to Latch Divisor DLAB=1 */ up_serialout(priv, AM335X_UART_LCR_OFFSET, UART_LCR_CONFIG_MODE_A); /* Clear FIFOs */ up_serialout(priv, AM335X_UART_FCR_OFFSET, (UART_FCR_RFIFO_CLEAR | UART_FCR_TFIFO_CLEAR)); /* Configure the FIFOs */ up_serialout(priv, AM335X_UART_FCR_OFFSET, (UART_FCR_FIFO_EN | UART_FCR_RFT_60CHAR | UART_FCR_TFT_56CHAR)); /* Set up the IER */ priv->ier = up_serialin(priv, AM335X_UART_IER_OFFSET); /* Set up the LCR */ lcr = 0; switch (priv->bits) { case 5: lcr |= UART_LCR_DLS_5BITS; break; case 6: lcr |= UART_LCR_DLS_6BITS; break; case 7: lcr |= UART_LCR_DLS_7BITS; break; case 8: default: lcr |= UART_LCR_DLS_8BITS; break; } if (priv->stopbits2) { lcr |= UART_LCR_STOP_2BITS; } if (priv->parity == 1) { lcr |= UART_LCR_PARITY_ODD; } else if (priv->parity == 2) { lcr |= UART_LCR_PARITY_EVEN; } /* Set the BAUD divisor */ dl = am335x_uartdl(priv->baud); up_serialout(priv, AM335X_UART_DLH_OFFSET, (dl >> 8) & UART_DLH_MASK); up_serialout(priv, AM335X_UART_DLL_OFFSET, dl & UART_DLL_MASK); /* Clear DLAB */ up_serialout(priv, AM335X_UART_LCR_OFFSET, lcr); /* Enable Auto-Flow Control in the Modem Control Register */ #if defined(CONFIG_SERIAL_IFLOWCONTROL) || defined(CONFIG_SERIAL_OFLOWCONTROL) # warning Missing logic #endif up_serialout(priv, AM335X_UART_MDR1_OFFSET, UART_MDR1_MODE_16x); #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, uart_interrupt, dev); if (ret == OK) { /* Enable the interrupt (RX and TX interrupts are still disabled * in the UART */ up_enable_irq(priv->irq); } 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: uartN_interrupt and uart_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 uart_dev_s structure in order to call these functions. * ****************************************************************************/ static int uart_interrupt(int irq, void *context, void *arg) { struct uart_dev_s *dev = (struct uart_dev_s *)arg; struct up_dev_s *priv; uint32_t status; int passes; DEBUGASSERT(dev != NULL && dev->priv != NULL); 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 (passes = 0; passes < 256; passes++) { /* Get the current UART status */ status = up_serialin(priv, AM335X_UART_IIR_OFFSET); /* Handle the interrupt by its interrupt ID field */ switch (status & UART_IIR_IID_MASK) { /* Handle incoming, receive bytes (with or without timeout) */ case UART_IIR_IID_RHR: case UART_IIR_IID_RXTIMEOUT: { uart_recvchars(dev); break; } /* Handle outgoing, transmit bytes */ case UART_IIR_IID_THR: { uart_xmitchars(dev); break; } /* Just clear modem status interrupts (UART1 only) */ case UART_IIR_IID_MODEM: { /* Read the modem status register (MSR) to clear */ status = up_serialin(priv, AM335X_UART_MSR_OFFSET); UNUSED(status); break; } /* Just clear any line status interrupts */ case UART_IIR_IID_RXSTATUS: { /* Read the line status register (LSR) to clear */ status = up_serialin(priv, AM335X_UART_LSR_OFFSET); UNUSED(status); break; } /* Just ignore */ case UART_IIR_IID_XOFF: { break; } /* Just ignore */ case UART_IIR_IID_STATECHANGE: { break; } /* No further interrupts pending... return now */ case UART_IIR_IID_NONE: { return OK; } /* Otherwise we have received an interrupt that we cannot handle */ default: { break; } } } 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) { 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) { #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 case TIOCSBRK: /* BSD compatibility: Turn break on, unconditionally */ { irqstate_t flags = enter_critical_section(); up_enablebreaks(priv, true); leave_critical_section(flags); } break; case TIOCCBRK: /* BSD compatibility: Turn break off, unconditionally */ { irqstate_t flags; flags = enter_critical_section(); up_enablebreaks(priv, false); leave_critical_section(flags); } break; #ifdef CONFIG_SERIAL_TERMIOS case TCGETS: { struct termios *termiosp = (struct termios *)arg; if (!termiosp) { ret = -EINVAL; break; } /* TODO: Other termios fields are not yet returned. * Note that cfsetospeed is not necessary because we have * knowledge that only one speed is supported. * Both cfset(i|o)speed() translate to cfsetspeed. */ cfsetispeed(termiosp, priv->baud); } break; case TCSETS: { struct termios *termiosp = (struct termios *)arg; uint32_t lcr; /* Holds current values of line control register */ uint16_t dl; /* Divisor latch */ if (!termiosp) { ret = -EINVAL; break; } /* TODO: Handle other termios settings. * Note that only cfgetispeed is used because we have knowledge * that only one speed is supported. */ /* Get the c_speed field in the termios struct */ priv->baud = cfgetispeed(termiosp); /* TODO: Re-calculate the optimal CCLK divisor for the new baud and * and reset the divider in the CLKSEL0/1 register. */ /* DLAB open latch */ /* REVISIT: Shouldn't we just call up_setup() to do all of the following? */ lcr = up_serialin(priv, AM335X_UART_LCR_OFFSET); up_serialout(priv, AM335X_UART_LCR_OFFSET, (lcr | UART_LCR_DLAB)); /* Set the BAUD divisor */ dl = am335x_uartdl(priv->baud); up_serialout(priv, AM335X_UART_DLH_OFFSET, (dl >> 8) & UART_DLH_MASK); up_serialout(priv, AM335X_UART_DLL_OFFSET, dl & UART_DLL_MASK); /* Clear DLAB */ up_serialout(priv, AM335X_UART_LCR_OFFSET, lcr); } 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; uint32_t rbr; *status = up_serialin(priv, AM335X_UART_LSR_OFFSET); rbr = up_serialin(priv, AM335X_UART_RBR_OFFSET); return rbr; } /**************************************************************************** * 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) { #ifndef CONFIG_SUPPRESS_SERIAL_INTS priv->ier |= UART_IER_RHR_CTI; #endif } else { priv->ier &= ~UART_IER_RHR_CTI; } up_serialout(priv, AM335X_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, AM335X_UART_LSR_OFFSET) & UART_LSR_DR) != 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, AM335X_UART_THR_OFFSET, (uint32_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; irqstate_t flags; flags = enter_critical_section(); if (enable) { #ifndef CONFIG_SUPPRESS_SERIAL_INTS priv->ier |= UART_IER_THR; up_serialout(priv, AM335X_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); #endif } else { priv->ier &= ~UART_IER_THR; up_serialout(priv, AM335X_UART_IER_OFFSET, priv->ier); } leave_critical_section(flags); } /**************************************************************************** * 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, AM335X_UART_LSR_OFFSET) & UART_LSR_THRE) != 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, AM335X_UART_LSR_OFFSET) & UART_LSR_TEMT) != 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. * * NOTE: Configuration of the CONSOLE UART was performed by up_lowsetup() * very early in the boot sequence. * ****************************************************************************/ void up_earlyserialinit(void) { /* Configure all UARTs (except the CONSOLE UART) and disable interrupts */ #ifdef CONFIG_AM335X_UART0 #ifndef CONFIG_UART0_SERIAL_CONSOLE am335x_uart0config(); #endif up_disableuartint(&g_uart0priv, NULL); #endif #ifdef CONFIG_AM335X_UART1 #ifndef CONFIG_UART1_SERIAL_CONSOLE am335x_uart1config(); #else #endif up_disableuartint(&g_uart1priv, NULL); #endif #ifdef CONFIG_AM335X_UART2 #ifndef CONFIG_UART2_SERIAL_CONSOLE am335x_uart2config(); #endif up_disableuartint(&g_uart2priv, NULL); #endif #ifdef CONFIG_AM335X_UART3 #ifndef CONFIG_UART3_SERIAL_CONSOLE am335x_uart3config(); #endif up_disableuartint(&g_uart3priv, NULL); #endif #ifdef CONFIG_AM335X_UART4 #ifndef CONFIG_UART4_SERIAL_CONSOLE am335x_uart4config(); #endif up_disableuartint(&g_uart4priv, NULL); #endif #ifdef CONFIG_AM335X_UART5 #ifndef CONFIG_UART5_SERIAL_CONSOLE am335x_uart5config(); #endif up_disableuartint(&g_uart5priv, NULL); #endif /* Configuration whichever one is the console */ #ifdef CONSOLE_DEV 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) { #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 #ifdef TTYS4_DEV (void)uart_register("/dev/ttyS4", &TTYS4_DEV); #endif #ifdef TTYS5_DEV (void)uart_register("/dev/ttyS5", &TTYS5_DEV); #endif } /**************************************************************************** * Name: up_putc * * Description: * Provide priority, low-level access to support OS debug writes * ****************************************************************************/ int up_putc(int ch) { #ifdef HAVE_SERIAL_CONSOLE struct up_dev_s *priv = (struct up_dev_s *)CONSOLE_DEV.priv; uint32_t ier; up_disableuartint(priv, &ier); #endif /* Check for LF */ if (ch == '\n') { /* Add CR */ up_lowputc('\r'); } up_lowputc(ch); #ifdef HAVE_SERIAL_CONSOLE 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_UART_DEVICE /* Check for LF */ if (ch == '\n') { /* Add CR */ up_lowputc('\r'); } up_lowputc(ch); #endif return ch; } #endif /* USE_SERIALDRIVER */