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https://github.com/apache/nuttx.git
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TMS570: Add TMS570 SCI driver(s). Initial commits are just SAMV7 drivers with name changes. A lot more needs to be done
This commit is contained in:
Gregory Nutt
@@ -331,12 +331,4 @@ void arm_boot(void)
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/* Perform common, low-level chip initialization (might do nothing) */
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tms570_lowsetup();
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#ifdef USE_EARLYSERIALINIT
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/* Perform early serial initialization if we are going to use the serial
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* driver.
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*/
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up_earlyserialinit();
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#endif
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}
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@@ -97,7 +97,7 @@ EXTERN const uintptr_t g_idle_topstack;
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*
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* Description:
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* Called at the very beginning of _start. Performs low level initialization
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* including setup of the console UART. This UART done early so that the serial
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* including setup of the console SCI. This SCI done early so that the serial
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* console is available for debugging very early in the boot sequence.
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*
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************************************************************************************/
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@@ -118,7 +118,7 @@ void tms570_lowsetup(void);
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*
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* - Initialization of board-specific memory resources (e.g., SDRAM)
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* - Configuration of board specific resources (GPIOs, LEDs, etc).
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* - Setup of the console UART. This UART done early so that the serial console
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* - Setup of the console SCI. This SCI done early so that the serial console
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* is available for debugging very early in the boot sequence.
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*
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* Special precautions must be taken if .data/.bss lie in SRAM. in that case,
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@@ -0,0 +1,291 @@
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/****************************************************************************
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* arch/arm/src/tms570/tms570_lowputc.c
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*
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* Copyright (C) 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Includes some logic from TI sample which has a compatibile three-clause
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* BSD license and:
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*
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* Copyright (c) 2012, Texas Instruments Incorporated
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <arch/irq.h>
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#include <arch/board/board.h>
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#include "up_internal.h"
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#include "up_arch.h"
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#include "tms570_config.h"
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#include "tms570_lowputc.h"
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#include "chip/tms570_sci.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration **********************************************************/
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#ifdef HAVE_SERIAL_CONSOLE
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/* BAUD definitions
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*
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* The source clock is selectable and could be one of:
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*
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* - The peripheral clock
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* - A division of the peripheral clock, where the divider is product-
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* dependent, but generally set to 8
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* - A processor/peripheral independent clock source fully programmable
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* provided by PMC (PCK)
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* - The external clock, available on the SCK pin
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*
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* Only the first two options are supported by this driver. The divided
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* peripheral clock is only used for very low BAUD selections.
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*/
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#define FAST_SCI_CLOCK BOARD_MCK_FREQUENCY
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#define SLOW_SCI_CLOCK (BOARD_MCK_FREQUENCY >> 3)
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/* Select SCI parameters for the selected console */
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# if defined(CONFIG_SCI1_SERIAL_CONSOLE)
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# define TMS570_CONSOLE_BASE TMS570_SCI1_BASE
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# define TMS570_CONSOLE_BAUD CONFIG_SCI1_BAUD
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# define TMS570_CONSOLE_BITS CONFIG_SCI1_BITS
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# define TMS570_CONSOLE_PARITY CONFIG_SCI1_PARITY
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# define TMS570_CONSOLE_2STOP CONFIG_SCI1_2STOP
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# elif defined(CONFIG_SCI2_SERIAL_CONSOLE)
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# define TMS570_CONSOLE_BASE TMS570_SCI2_BASE
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# define TMS570_CONSOLE_BAUD CONFIG_SCI2_BAUD
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# define TMS570_CONSOLE_BITS CONFIG_SCI2_BITS
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# define TMS570_CONSOLE_PARITY CONFIG_SCI2_PARITY
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# define TMS570_CONSOLE_2STOP CONFIG_SCI2_2STOP
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# else
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# error "No CONFIG_SCIn_SERIAL_CONSOLE Setting"
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# endif
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/* Select the settings for the mode register */
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# if TMS570_CONSOLE_BITS == 5
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# define MR_CHRL_VALUE SCI_MR_CHRL_5BITS /* 5 bits */
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# elif TMS570_CONSOLE_BITS == 6
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# define MR_CHRL_VALUE SCI_MR_CHRL_6BITS /* 6 bits */
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# elif TMS570_CONSOLE_BITS == 7
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# define MR_CHRL_VALUE SCI_MR_CHRL_7BITS /* 7 bits */
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# elif TMS570_CONSOLE_BITS == 8
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# define MR_CHRL_VALUE SCI_MR_CHRL_8BITS /* 8 bits */
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# elif TMS570_CONSOLE_BITS == 9 && !defined(CONFIG_SCI1_SERIAL_CONSOLE) && \
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!defined(CONFIG_SCI2_SERIAL_CONSOLE)
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# define MR_CHRL_VALUE SCI_MR_MODE9
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# else
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# error "Invalid number of bits"
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# endif
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# if TMS570_CONSOLE_PARITY == 1
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# define MR_PAR_VALUE SCI_MR_PAR_ODD
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# elif TMS570_CONSOLE_PARITY == 2
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# define MR_PAR_VALUE SCI_MR_PAR_EVEN
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# else
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# define MR_PAR_VALUE SCI_MR_PAR_NONE
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# endif
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# if TMS570_CONSOLE_2STOP != 0
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# define MR_NBSTOP_VALUE SCI_MR_NBSTOP_2
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# else
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# define MR_NBSTOP_VALUE SCI_MR_NBSTOP_1
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# endif
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# define MR_VALUE (SCI_MR_MODE_NORMAL | SCI_MR_USCLKS_MCK | \
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MR_CHRL_VALUE | MR_PAR_VALUE | MR_NBSTOP_VALUE)
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#endif /* HAVE_SERIAL_CONSOLE */
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_lowputc
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*
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* Description:
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* Output one byte on the serial console
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*
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****************************************************************************/
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void up_lowputc(char ch)
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{
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#ifdef HAVE_SERIAL_CONSOLE
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irqstate_t flags;
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for (; ; )
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{
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/* Wait for the transmitter to be available */
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while ((getreg32(TMS570_CONSOLE_BASE + TMS570_SCI_SR_OFFSET) &
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SCI_INT_TXEMPTY) == 0);
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/* Disable interrupts so that the test and the transmission are
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* atomic.
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*/
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flags = irqsave();
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if ((getreg32(TMS570_CONSOLE_BASE + TMS570_SCI_SR_OFFSET) &
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SCI_INT_TXEMPTY) != 0)
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{
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/* Send the character */
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putreg32((uint32_t)ch, TMS570_CONSOLE_BASE + TMS570_SCI_THR_OFFSET);
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irqrestore(flags);
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return;
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}
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irqrestore(flags);
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}
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#endif
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}
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/****************************************************************************
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* Name: up_putc
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*
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* Description:
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* Provide priority, low-level access to support OS debug writes
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*
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****************************************************************************/
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int up_putc(int ch)
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{
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#ifdef HAVE_SERIAL_CONSOLE
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/* Check for LF */
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if (ch == '\n')
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{
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/* Add CR */
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up_lowputc('\r');
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}
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up_lowputc(ch);
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#endif
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return ch;
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}
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/****************************************************************************
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* Name: tms570_lowsetup
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*
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* Description:
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* This performs basic initialization of the SCI used for the serial
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* console. Its purpose is to get the console output availabe as soon
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* as possible.
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*
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****************************************************************************/
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void tms570_lowsetup(void)
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{
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#if defined(HAVE_SERIAL_CONSOLE) && !defined(CONFIG_SUPPRESS_SCI_CONFIG)
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uint64_t divb3;
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uint32_t intpart;
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uint32_t fracpart;
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uint32_t regval;
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#endif
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/* Configure the console (only) */
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#if defined(HAVE_SERIAL_CONSOLE) && !defined(CONFIG_SUPPRESS_SCI_CONFIG)
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/* Reset and disable receiver and transmitter */
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putreg32((SCI_CR_RSTRX | SCI_CR_RSTTX | SCI_CR_RXDIS | SCI_CR_TXDIS),
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TMS570_CONSOLE_BASE + TMS570_SCI_CR_OFFSET);
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/* Disable all interrupts */
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putreg32(0xffffffff, TMS570_CONSOLE_BASE + TMS570_SCI_IDR_OFFSET);
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/* Set up the mode register */
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putreg32(MR_VALUE, TMS570_CONSOLE_BASE + TMS570_SCI_MR_OFFSET);
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/* Configure the console baud:
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*
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* Fbaud = SCI_CLOCK / (16 * divisor)
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* divisor = SCI_CLOCK / (16 * Fbaud)
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*
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* NOTE: Oversampling by 8 is not supported. This may limit BAUD rates
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* for lower SCI clocks.
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*/
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divb3 = ((FAST_SCI_CLOCK + (TMS570_CONSOLE_BAUD << 3)) << 3) /
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(TMS570_CONSOLE_BAUD << 4);
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intpart = (divb3 >> 3);
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fracpart = (divb3 & 7);
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/* Retain the fast MR peripheral clock UNLESS unless using that clock
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* would result in an excessively large divider.
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*
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* REVISIT: The fractional divider is not used.
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*/
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if ((intpart & ~SCI_BRGR_CD_MASK) != 0)
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{
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/* Use the divided SCI clock */
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divb3 = ((SLOW_SCI_CLOCK + (TMS570_CONSOLE_BAUD << 3)) << 3) /
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(TMS570_CONSOLE_BAUD << 4);
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intpart = (divb3 >> 3);
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fracpart = (divb3 & 7);
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/* Re-select the clock source */
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regval = getreg32(TMS570_CONSOLE_BASE + TMS570_SCI_MR_OFFSET);
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regval &= ~SCI_MR_USCLKS_MASK;
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regval |= SCI_MR_USCLKS_MCKDIV;
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putreg32(regval, TMS570_CONSOLE_BASE + TMS570_SCI_MR_OFFSET);
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}
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/* Save the BAUD divider (the fractional part is not used for SCIs) */
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regval = SCI_BRGR_CD(intpart) | SCI_BRGR_FP(fracpart);
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putreg32(regval, TMS570_CONSOLE_BASE + TMS570_SCI_BRGR_OFFSET);
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/* Enable receiver & transmitter */
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putreg32((SCI_CR_RXEN | SCI_CR_TXEN),
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TMS570_CONSOLE_BASE + TMS570_SCI_CR_OFFSET);
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#endif
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}
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@@ -0,0 +1,114 @@
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/************************************************************************************
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* arch/arm/src/tms570/tms570_lowputc.h
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*
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* Copyright (C) 2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 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
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
|
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* used to endorse or promote products derived from this software
|
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* without specific prior written permission.
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*
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* 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
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||||
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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************************************************************************************/
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#ifndef __ARCH_ARM_SRC_TMS570_TMS570_LOWPUTC_H
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#define __ARCH_ARM_SRC_TMS570_TMS570_LOWPUTC_H
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/************************************************************************************
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* Included Files
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************************************************************************************/
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#include <nuttx/config.h>
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#include <nuttx/compiler.h>
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#include <sys/types.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include "up_internal.h"
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#include "chip.h"
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/************************************************************************************
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* Pre-processor Definitions
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************************************************************************************/
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/************************************************************************************
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* Public Types
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************************************************************************************/
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/************************************************************************************
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* Inline Functions
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************************************************************************************/
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#ifndef __ASSEMBLY__
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/************************************************************************************
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* Public Data
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************************************************************************************/
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#undef EXTERN
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#if defined(__cplusplus)
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/************************************************************************************
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* Public Function Prototypes
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************************************************************************************/
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/************************************************************************************
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* Name: tms570_lowsetup
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*
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* Description:
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* Called at the very beginning of _start. Performs low level initialization
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* including setup of the console SCI. This SCI done early so that the serial
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* console is available for debugging very early in the boot sequence.
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*
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************************************************************************************/
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void tms570_lowsetup(void);
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/************************************************************************************
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* Name: tms570_boardinitialize
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*
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* Description:
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* All TMS570 architectures must provide the following entry point. This entry
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* point is called early in the initialization -- after all memory has been
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* configured and mapped but before any devices have been initialized.
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*
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************************************************************************************/
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void tms570_boardinitialize(void);
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#undef EXTERN
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#if defined(__cplusplus)
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}
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#endif
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#endif /* __ASSEMBLY__ */
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#endif /* __ARCH_ARM_SRC_TMS570_TMS570_LOWPUTC_H */
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