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nuttx/arch/arm/src/am335x/am335x_serial.c

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Initial changes for BeagleBone Black board support (TI AM335x family based on Cortex-A8) Squashed commit of the following: Author: Gregory Nutt <gnutt@nuttx.org> Many small changes related to coding style. Author: Petro Karashchenko <petro.karashchenko@gmail.com> configs/beaglebone-black: Adds initial support for the BeagleBone Black board. arch/arm/src/am335x: Adds initial support for the TI AM355x family.
2019-01-06 16:05:38 +01:00
/****************************************************************************
* arch/arm/src/am335x/am335x_serial.c
*
* Copyright (C) 2018 Petro Karashchenko. All rights reserved.
* Author: Petro Karashchenko <petro.karashchneko@gmail.com>
*
* 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>
#ifdef CONFIG_SERIAL_TERMIOS
# include <termios.h>
#endif
#include <nuttx/irq.h>
#include <nuttx/arch.h>
#include <nuttx/serial/serial.h>
#include <arch/board/board.h>
#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 */
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