/**************************************************************************
* arch/arm/src/str71x/str71x_lowputc.c
*
* Copyright (C) 2008 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name 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 "up_internal.h"
#include "up_arch.h"
#include "chp.h"
/**************************************************************************
* Private Definitions
**************************************************************************/
/* Configuration **********************************************************/
/* Is there a UART enabled? */
#if defined(CONFIG_STR71X_UART0) || defined(CONFIG_STR71X_UART1) || \
defined(CONFIG_STR71X_UART2) || defined(CONFIG_STR71X_UART3))
# define HAVE_UART 1
/* 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
# else
# undef HAVE_CONSOLE
# endif
#else
# undef HAVE_UART
# undef HAVE_CONSOLE
#endif
/* GPIO0 UART configuration bits */
#if CONFIG_STR71X_UART0
# define STR71X_UART0_GPIO0_MASK (0x0300) /* P0.8->U0.TX, B0.9->U0.RX */
# define STR71X_UART0_GPIO0_PC0BITS (0x0300)
# define STR71X_UART0_GPIO0_PC1BITS (0x0200)
# define STR71X_UART0_GPIO0_PC2BITS (0x0200)
#else
# define STR71X_UART0_GPIO0_MASK (0)
# define STR71X_UART0_GPIO0_PC0BITS (0)
# define STR71X_UART0_GPIO0_PC1BITS (0)
# define STR71X_UART0_GPIO0_PC2BITS (0)
#endif
#if CONFIG_STR71X_UART0
# define STR71X_UART1_GPIO0_MASK (0x0c00) /* P0,10->U1.RX, P0.11->U1.TX */
# define STR71X_UART1_GPIO0_PC0BITS (0x0c00)
# define STR71X_UART1_GPIO0_PC1BITS (0x0800)
# define STR71X_UART1_GPIO0_PC2BITS (0x0800)
#else
# define STR71X_UART1_GPIO0_MASK (0)
# define STR71X_UART1_GPIO0_PC0BITS (0)
# define STR71X_UART1_GPIO0_PC1BITS (0)
# define STR71X_UART1_GPIO0_PC2BITS (0)
#endif
#if CONFIG_STR71X_UART0
# define STR71X_UART2_GPIO0_MASK (0x6000) /* P0.13->U2.RX, P0.14>U2.TX */
# define STR71X_UART2_GPIO0_PC0BITS (0x6000)
# define STR71X_UART2_GPIO0_PC1BITS (0x4000)
# define STR71X_UART2_GPIO0_PC2BITS (0x4000)
#else
# define STR71X_UART2_GPIO0_MASK (0)
# define STR71X_UART2_GPIO0_PC0BITS (0)
# define STR71X_UART2_GPIO0_PC1BITS (0)
# define STR71X_UART2_GPIO0_PC2BITS (0)
#endif
#if CONFIG_STR71X_UART0
# define STR71X_UART3_GPIO0_MASK (0x0003) /* P0.0->U3.TX, P0.1->U3.RX */
# define STR71X_UART3_GPIO0_PC0BITS (0x0003)
# define STR71X_UART3_GPIO0_PC1BITS (0x0001)
# define STR71X_UART3_GPIO0_PC2BITS (0x0001)
#else
# define STR71X_UART3_GPIO0_MASK (0)
# define STR71X_UART3_GPIO0_PC0BITS (0)
# define STR71X_UART3_GPIO0_PC1BITS (0)
# define STR71X_UART3_GPIO0_PC2BITS (0)
#endif
#define STR71X_UART_GPIO0_MASK (STR71X_UART0_GPIO0_MASK |STR71X_UART1_GPIO0_MASK|\
STR71X_UART2_GPIO0_MASK |STR71X_UART3_GPIO0_MASK)
#define STR71X_UART_GPIO0_PC0BITS (STR71X_UART0_GPIO0_PC0BITS|STR71X_UART1_GPIO0_PC0BITS|\
STR71X_UART2_GPIO0_PC0BITS|STR71X_UART3_GPIO0_PC0BITS)
#define STR71X_UART_GPIO0_PC1BITS (STR71X_UART0_GPIO0_PC0BITS|STR71X_UART1_GPIO0_PC0BITS|\
STR71X_UART2_GPIO0_PC0BITS|STR71X_UART3_GPIO0_PC0BITS)
#define STR71X_UART_GPIO0_PC2BITS (STR71X_UART0_GPIO0_PC0BITS|STR71X_UART1_GPIO0_PC0BITS|\
STR71X_UART2_GPIO0_PC0BITS|STR71X_UART3_GPIO0_PC0BITS)
/* Select UART parameters for the selected console */
#if defined(CONFIG_UART0_SERIAL_CONSOLE)
# define STR71X_UART_BASE STR71X_UART0_BASE
# define STR71X_UART_BAUD CONFIG_UART0_BAUD
# define STR71X_UART_BITS CONFIG_UART0_BITS
# define STR71X_UART_PARITY CONFIG_UART0_PARITY
# define STR71X_UART_2STOP CONFIG_UART0_2STOP
#elif defined(CONFIG_UART1_SERIAL_CONSOLE)
# define STR71X_UART_BASE STR71X_UART1_BASE
# define STR71X_UART_BAUD CONFIG_UART1_BAUD
# define STR71X_UART_BITS CONFIG_UART1_BITS
# define STR71X_UART_PARITY CONFIG_UART1_PARITY
# define STR71X_UART_2STOP CONFIG_UART1_2STOP
#elif defined(CONFIG_UART2_SERIAL_CONSOLE)
# define STR71X_UART_BASE STR71X_UART2_BASE
# define STR71X_UART_BAUD CONFIG_UART2_BAUD
# define STR71X_UART_BITS CONFIG_UART2_BITS
# define STR71X_UART_PARITY CONFIG_UART2_PARITY
# define STR71X_UART_2STOP CONFIG_UART2_2STOP
#elif defined(CONFIG_UART3_SERIAL_CONSOLE)
# define STR71X_UART_BASE STR71X_UART3_BASE
# define STR71X_UART_BAUD CONFIG_UART3_BAUD
# define STR71X_UART_BITS CONFIG_UART3_BITS
# define STR71X_UART_PARITY CONFIG_UART3_PARITY
# define STR71X_UART_2STOP CONFIG_UART3_2STOP
#else
# error "No CONFIG_UARTn_SERIAL_CONSOLE Setting"
#endif
/* Get mode setting */
#if STR71X_UART_BITS == 7
# if STR71X_UART_PARITY == 0
# error "7-bits, no parity mode not supported"
# else
# define STR71X_UARTCR_MODE STR71X_UARTCR_MODE7BITP
# endif
#elif STR71X_UART_BITS == 8
# if STR71X_UART_PARITY == 0
# define STR71X_UARTCR_MODE STR71X_UARTCR_MODE8BIT
# else
# define STR71X_UARTCR_MODE STR71X_UARTCR_MODE8BITP
# endif
#elif STR71X_UART_BITS == 9
# if STR71X_UART_PARITY == 0
# define STR71X_UARTCR_MODE STR71X_UARTCR_MODE9BIT
# else
# error "9-bits with parity not supported"
# endif
#else
# error "Number of bits not supported"
#endif
#if STR71X_UART_PARITY == 0 || STR71X_UART_PARITY == 2
# define STR71X_UARTCR_PARITY (0)
#elif STR71X_UART_PARITY == 1
# define STR71X_UARTCR_PARITY STR71X_UARTCR_PARITYODD
#else
# error "Invalid parity selection"
#endif
#if STR71X_UART_2STOP != 0
# define STR71X_UARTCR_STOP STR71X_UARTCR_STOPBIT20
#else
# define STR71X_UARTCR_STOP STR71X_UARTCR_STOPBIT05
#endif
#define STR71X_UARTCR_VALUE (STR71X_UARTCR_MODE|STR71X_UARTCR_PARITY|STR71X_UARTCR_STOP|\
STR71X_UARTCR_RUN|STR71X_UARTCR_RXENABLE|STR71X_UARTCR_FIFOENABLE)
/* Calculate the value of PCLK1 from settings in board.h.
*
* Example:
* STR71X_RCCU_MAIN_OSC = 4MHz (not divided by 2)
* CLK2 = 4MHz
* PLL1OUT = 16 * CLK2 / 2 = 32MHz
* CLK3 = 32MHz
* RCLK = 32MHz
* PCLK1 = 32MHz / 1 = 32MHz
*/
#ifdef STR71X_PLL1IN_DIV2 /* Input may be divided by 2 */
# define CLK2 (STR71X_RCCU_MAIN_OSC/2) /* CLK2 is input to PLL1 */
#else
# define CLK2 STR71X_RCCU_MAIN_OSC /* CLK2 is input to PLL1 */
#endif
/* PLL1OUT derives from CLK2 */
#define PLL1OUT (STR71X_PLL1OUT_MUL * CLK2 / STR71X_PLL1OUT_DIV)
#define CLK3 PLL1OUT /* CLK3 hard coded to be PLL1OUT */
#define RCLK CLK3 /* RCLK hard coded to be CLK3 */
#define PCLK1 (RCLK / STR71X_APB1_DIV) /* PCLK1 derives from RCLK */
/* Calculate BAUD rate from PCLK1:
*
* Example:
* PCLK1 = 32MHz
* STR71X_UART_BAUD = 38,400
* UART_BAUDRATE_DIVISOR = 614,400
* UART_BAUDRATE = 52.583 (exact) or 52 truncated (1.1% error)
*/
#define UART_BAUDDIVISOR (16 * STR71X_UART_BAUD)
#define UART_BAUDRATE ((PCLK1 + (UART_BAUDDIVISOR/2) / UART_BAUDDIVISOR)
/**************************************************************************
* Private Types
**************************************************************************/
/**************************************************************************
* Private Function Prototypes
**************************************************************************/
/**************************************************************************
* Global Variables
**************************************************************************/
/**************************************************************************
* Private Variables
**************************************************************************/
/**************************************************************************
* Private Functions
**************************************************************************/
/**************************************************************************
* Public Functions
**************************************************************************/
/**************************************************************************
* Name: up_lowputc
*
* Description:
* Output one byte on the serial console
*
**************************************************************************/
void up_lowputc(char ch)
{
#if HAVE_CONSOLE
uint16 reg16;
/* Wait until the TX FIFO is not full */
while (getreg16(STR71X_UART_SR(STR71X_UART_BASE)) & STR71X_UARTSR_TF != 0);
/* Then send the character */
putreg16((uint16)ch, STR71X_UART_TXBUFR(STR71X_UART_BASE));
#endif
}
/**************************************************************************
* Name: up_lowsetup
*
* Description:
* This performs basic initialization of the UART used for the serial
* console. Its purpose is to get the console output availabe as soon
* as possible.
*
**************************************************************************/
void up_lowsetup(void)
{
#if HAVE_CONSOLE
uint16 reg16;
/* Enable the selected console device */
/* Set the UART baud rate */
putreg16(UART_BAUDRATE, STR71X_UART_BR(STR71X_UART_BASE));
/* Configure the UART control registers */
putreg16(STR71X_UARTCR_VALUE, STR71X_UART_CR(STR71X_UART_BASE));
/* Clear FIFOs */
putreg16(0, STR71X_UART2_TXRSTR_(STR71X_UART_BASE));
putreg16(0, SSTR71X_UART2_RXRSTR(STR71X_UART_BASE));
#endif
/* Configure GPIO0 pins to enable all UARTs in the configuration
* (the serial driver later depends on this configuration)
*/
#if HAVE_UART
reg16 = getreg16(STR71X_GPIO0_PC0);
reg16 &= STR71X_GPIO0_MASK;
reg16 |= STR71X_GPIO0_PC0BITS;
putreg16(reg16, STR71X_GPIO0_PC0);
reg16 = getreg16(STR71X_GPIO0_PC1);
reg16 &= STR71X_GPIO0_MASK;
reg16 |= STR71X_GPIO0_PC1BITS;
putreg16(reg16, STR71X_GPIO0_PC1);
reg16 = getreg16(STR71X_GPIO0_PC2);
reg16 &= STR71X_GPIO0_MASK;
reg16 |= STR71X_GPIO0_PC2BITS;
putreg16(reg16, STR71X_GPIO0_PC2);
#endif
}
