LPC43xx: Remove unused .c file picked up in a recent merge
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@ -1,573 +0,0 @@
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/*******************************************************************************
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* arch/arm/src/lpc43xx/lpc43_i2c.c
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*
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* Copyright (C) 2012, 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Ported from from the LPC17 version:
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*
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* Copyright (C) 2011 Li Zhuoyi. All rights reserved.
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* Author: Li Zhuoyi <lzyy.cn@gmail.com>
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* History: 0.1 2011-08-20 initial version
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*
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* Derived from arch/arm/src/lpc31xx/lpc31_i2c.c
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*
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* Author: David Hewson
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*
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* Copyright (C) 2010-2011 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
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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 <sys/types.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <stdlib.h>
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#include <string.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/arch.h>
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#include <nuttx/wdog.h>
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#include <nuttx/i2c.h>
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#include <arch/irq.h>
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#include <arch/board/board.h>
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#include "chip.h"
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#include "up_arch.h"
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#include "up_internal.h"
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#include "lpc43_i2c.h"
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#include "lpc43_scu.h"
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#include "lpc43_ccu.h"
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#if defined(CONFIG_LPC43_I2C0) || defined(CONFIG_LPC43_I2C1)
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#ifndef PINCONF_I2C1_SCL
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# define PINCONF_I2C1_SCL PINCONF_I2C1_SCL_1
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# define PINCONF_I2C1_SDA PINCONF_I2C1_SDA_1
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#endif
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#ifndef CONFIG_I2C0_FREQ
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# define CONFIG_I2C0_FREQ 100000
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#endif
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#ifndef CONFIG_I2C1_FREQ
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# define CONFIG_I2C1_FREQ 100000
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#endif
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#ifndef CONFIG_I2C2_FREQ
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# define CONFIG_I2C2_FREQ 100000
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#endif
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/*******************************************************************************
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* Pre-processor Definitions
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*******************************************************************************/
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#define I2C_TIMEOUT ((20 * CLK_TCK) / 1000) /* 20 mS */
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/****************************************************************************
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* Private Data
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****************************************************************************/
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struct lpc43_i2cdev_s
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{
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struct i2c_dev_s dev; /* Generic I2C device */
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struct i2c_msg_s msg; /* a single message for legacy read/write */
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unsigned int base; /* Base address of registers */
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uint16_t irqid; /* IRQ for this device */
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sem_t mutex; /* Only one thread can access at a time */
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sem_t wait; /* Place to wait for state machine completion */
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volatile uint8_t state; /* State of state machine */
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WDOG_ID timeout; /* watchdog to timeout when bus hung */
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uint16_t wrcnt; /* number of bytes sent to tx fifo */
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uint16_t rdcnt; /* number of bytes read from rx fifo */
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};
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#ifdef CONFIG_LPC43_I2C0
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static struct lpc43_i2cdev_s g_i2c0dev;
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#endif
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#ifdef CONFIG_LPC43_I2C1
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static struct lpc43_i2cdev_s g_i2c1dev;
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#endif
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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static int i2c_start(struct lpc43_i2cdev_s *priv);
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static void i2c_stop(struct lpc43_i2cdev_s *priv);
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static int i2c_interrupt(int irq, FAR void *context);
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static void i2c_timeout(int argc, uint32_t arg, ...);
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/****************************************************************************
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* I2C device operations
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****************************************************************************/
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static uint32_t i2c_setfrequency(FAR struct i2c_dev_s *dev,
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uint32_t frequency);
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static int i2c_setaddress(FAR struct i2c_dev_s *dev, int addr,
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int nbits);
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static int i2c_write(FAR struct i2c_dev_s *dev, const uint8_t *buffer,
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int buflen);
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static int i2c_read(FAR struct i2c_dev_s *dev, uint8_t *buffer,
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int buflen);
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static int i2c_transfer(FAR struct i2c_dev_s *dev,
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FAR struct i2c_msg_s *msgs, int count);
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struct i2c_ops_s lpc43_i2c_ops =
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{
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.setfrequency = i2c_setfrequency,
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.setaddress = i2c_setaddress,
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.write = i2c_write,
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.read = i2c_read,
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#ifdef CONFIG_I2C_TRANSFER
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.transfer = i2c_transfer
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#endif
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};
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/*******************************************************************************
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* Name: lpc43_i2c_setfrequency
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*
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* Description:
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* Set the frequence for the next transfer
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*
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*******************************************************************************/
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static uint32_t i2c_setfrequency(FAR struct i2c_dev_s *dev, uint32_t frequency)
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{
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struct lpc43_i2cdev_s *priv = (struct lpc43_i2cdev_s *) dev;
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if (frequency > 100000)
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{
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/* asymetric per 400Khz I2C spec */
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putreg32(LPC43_CCLK / (83 + 47) * 47 / frequency, priv->base + LPC43_I2C_SCLH_OFFSET);
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putreg32(LPC43_CCLK / (83 + 47) * 83 / frequency, priv->base + LPC43_I2C_SCLL_OFFSET);
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}
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else
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{
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/* 50/50 mark space ratio */
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putreg32(LPC43_CCLK / 100 * 50 / frequency, priv->base + LPC43_I2C_SCLH_OFFSET);
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putreg32(LPC43_CCLK / 100 * 50 / frequency, priv->base + LPC43_I2C_SCLL_OFFSET);
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}
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/* FIXME: This function should return the actual selected frequency */
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return (frequency);
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}
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/*******************************************************************************
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* Name: lpc43_i2c_setaddress
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*
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* Description:
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* Set the I2C slave address for a subsequent read/write
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*
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*******************************************************************************/
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static int i2c_setaddress(FAR struct i2c_dev_s *dev, int addr, int nbits)
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{
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struct lpc43_i2cdev_s *priv = (struct lpc43_i2cdev_s *)dev;
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DEBUGASSERT(dev != NULL);
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DEBUGASSERT(nbits == 7);
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priv->msg.addr = addr << 1;
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priv->msg.flags = 0 ;
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return (0);
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}
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/*******************************************************************************
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* Name: lpc43_i2c_write
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*
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* Description:
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* Send a block of data on I2C using the previously selected I2C
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* frequency and slave address.
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*
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*******************************************************************************/
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static int i2c_write(FAR struct i2c_dev_s *dev, const uint8_t *buffer,
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int buflen)
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{
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struct lpc43_i2cdev_s *priv = (struct lpc43_i2cdev_s *)dev;
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int ret;
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DEBUGASSERT(dev != NULL);
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priv->wrcnt = 0;
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priv->rdcnt = 0;
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priv->msg.addr &= ~0x01;
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priv->msg.buffer = (uint8_t*)buffer;
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priv->msg.length = buflen;
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ret = i2c_start(priv);
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return (ret > 0 ? 0 : -ETIMEDOUT);
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}
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/*******************************************************************************
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* Name: lpc43_i2c_read
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*
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* Description:
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* Receive a block of data on I2C using the previously selected I2C
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* frequency and slave address.
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*
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*******************************************************************************/
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static int i2c_read(FAR struct i2c_dev_s *dev, uint8_t *buffer, int buflen)
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{
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struct lpc43_i2cdev_s *priv = (struct lpc43_i2cdev_s *)dev;
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int ret;
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DEBUGASSERT(dev != NULL);
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priv->wrcnt=0;
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priv->rdcnt=0;
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priv->msg.addr |= 0x01;
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priv->msg.buffer = buffer;
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priv->msg.length = buflen;
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ret = i2c_start(priv);
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return (ret >0 ? 0 : -ETIMEDOUT);
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}
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/*******************************************************************************
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* Name: i2c_start
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*
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* Description:
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* Perform a I2C transfer start
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*
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*******************************************************************************/
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static int i2c_start(struct lpc43_i2cdev_s *priv)
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{
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int ret = -1;
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sem_wait(&priv->mutex);
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putreg32(I2C_CONCLR_STAC|I2C_CONCLR_SIC,priv->base+LPC43_I2C_CONCLR_OFFSET);
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putreg32(I2C_CONSET_STA,priv->base+LPC43_I2C_CONSET_OFFSET);
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wd_start(priv->timeout, I2C_TIMEOUT, i2c_timeout, 1, (uint32_t)priv);
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sem_wait(&priv->wait);
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wd_cancel(priv->timeout);
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sem_post(&priv->mutex);
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if (priv-> state == 0x18 || priv->state == 0x28)
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{
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ret = priv->wrcnt;
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}
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else if (priv-> state == 0x50 || priv->state == 0x58)
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{
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ret = priv->rdcnt;
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}
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return (ret);
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}
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/*******************************************************************************
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* Name: i2c_stop
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*
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* Description:
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* Perform a I2C transfer stop
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*
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*******************************************************************************/
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static void i2c_stop(struct lpc43_i2cdev_s *priv)
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{
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if (priv->state != 0x38)
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{
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putreg32(I2C_CONSET_STO|I2C_CONSET_AA,priv->base+LPC43_I2C_CONSET_OFFSET);
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}
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sem_post(&priv->wait);
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}
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/*******************************************************************************
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* Name: i2c_timeout
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*
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* Description:
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* Watchdog timer for timeout of I2C operation
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*
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*******************************************************************************/
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static void i2c_timeout(int argc, uint32_t arg, ...)
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{
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struct lpc43_i2cdev_s *priv = (struct lpc43_i2cdev_s *)arg;
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irqstate_t flags = irqsave();
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priv->state = 0xff;
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sem_post(&priv->wait);
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irqrestore(flags);
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}
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/*******************************************************************************
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* Name: i2c_interrupt
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*
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* Description:
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* The I2C Interrupt Handler
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*
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*******************************************************************************/
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static int i2c_interrupt(int irq, FAR void *context)
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{
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struct lpc43_i2cdev_s *priv;
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uint32_t state;
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#ifdef CONFIG_LPC43_I2C0
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if (irq == LPC43M0_IRQ_I2C0)
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{
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priv = &g_i2c0dev;
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}
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else
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#endif
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#ifdef CONFIG_LPC43_I2C1
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if (irq == LPC43_IRQ_I2C1)
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{
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priv = &g_i2c1dev;
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}
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else
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#endif
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{
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PANIC();
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}
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/* Reference UM10360 19.10.5 */
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state = getreg32(priv->base+LPC43_I2C_STAT_OFFSET);
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putreg32(I2C_CONCLR_SIC, priv->base + LPC43_I2C_CONCLR_OFFSET);
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priv->state = state;
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state &= 0xf8;
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switch (state)
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{
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case 0x00: /* Bus Error */
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case 0x20:
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case 0x30:
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case 0x38:
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case 0x48:
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i2c_stop(priv);
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break;
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case 0x08: /* START */
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case 0x10: /* Repeated START */
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putreg32(priv->msg.addr, priv->base + LPC43_I2C_DAT_OFFSET);
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putreg32(I2C_CONCLR_STAC, priv->base + LPC43_I2C_CONCLR_OFFSET);
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break;
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case 0x18:
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priv->wrcnt=0;
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putreg32(priv->msg.buffer[0], priv->base + LPC43_I2C_DAT_OFFSET);
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break;
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case 0x28:
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priv->wrcnt++;
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if (priv->wrcnt < priv->msg.length)
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{
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putreg32(priv->msg.buffer[priv->wrcnt],priv->base+LPC43_I2C_DAT_OFFSET);
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}
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else
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{
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i2c_stop(priv);
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}
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break;
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case 0x40:
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priv->rdcnt = -1;
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putreg32(I2C_CONSET_AA, priv->base + LPC43_I2C_CONSET_OFFSET);
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break;
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case 0x50:
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priv->rdcnt++;
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if (priv->rdcnt < priv->msg.length)
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{
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priv->msg.buffer[priv->rdcnt]=getreg32(priv->base+LPC43_I2C_BUFR_OFFSET);
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}
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if (priv->rdcnt >= priv->msg.length - 1)
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{
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putreg32(I2C_CONCLR_AAC|I2C_CONCLR_SIC,priv->base+LPC43_I2C_CONCLR_OFFSET);
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}
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break;
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case 0x58:
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i2c_stop(priv);
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break;
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default:
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i2c_stop(priv);
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break;
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}
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return (0);
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/*******************************************************************************
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* Name: up_i2cinitialize
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*
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* Description:
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* Initialise an I2C device
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*
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*******************************************************************************/
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struct i2c_dev_s *up_i2cinitialize(int port)
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{
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struct lpc43_i2cdev_s *priv;
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if (port>2)
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{
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dbg("lpc I2C Only support 0,1,2\n");
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return NULL;
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}
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irqstate_t flags;
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uint32_t regval;
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flags = irqsave();
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#ifdef CONFIG_LPC43_I2C0
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if (port == 0)
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{
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priv = &g_i2c0dev;
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priv->base = LPC43_I2C0_BASE;
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priv->irqid = LPC43M0_IRQ_I2C0;
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//enable
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regval = getreg32(LPC43_SCU_SFSI2C0 );
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regval |= SCU_SFSI2C0_SCL_EZI | SCU_SFSI2C0_SDA_EZI;
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if ( CONFIG_I2C0_FREQ == 1000000 ) { //super fast mode
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regval |= SCU_SFSI2C0_SCL_EHD | SCU_SFSI2C0_SDA_EHD;
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}
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putreg32(regval, LPC43_SCU_SFSI2C0);
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//enable clock
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regval = getreg32(LPC43_CCU1_APB1_I2C0_CFG);
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regval |= CCU_CLK_CFG_RUN;
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putreg32(regval, LPC43_CCU1_APB1_I2C0_CFG);
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//
|
||||
putreg32(LPC43_CCLK/CONFIG_I2C0_FREQ/2, priv->base + LPC43_I2C_SCLH_OFFSET);
|
||||
putreg32(LPC43_CCLK/CONFIG_I2C0_FREQ/2, priv->base + LPC43_I2C_SCLL_OFFSET);
|
||||
|
||||
//no pins configuration needed
|
||||
}
|
||||
else
|
||||
#endif
|
||||
#ifdef CONFIG_LPC43_I2C1
|
||||
if (port == 1)
|
||||
{
|
||||
priv = &g_i2c1dev;
|
||||
priv->base = LPC43_I2C1_BASE;
|
||||
priv->irqid = LPC43_IRQ_I2C1;
|
||||
|
||||
regval = getreg32(LPC43_SCU_SFSI2C0);
|
||||
regval |= SYSCON_PCONP_PCI2C1;
|
||||
putreg32(regval, LPC43_SCU_SFSI2C0);
|
||||
|
||||
regval = getreg32(LPC43_SYSCON_PCLKSEL1);
|
||||
regval &= ~SYSCON_PCLKSEL1_I2C1_MASK;
|
||||
regval |= (SYSCON_PCLKSEL_CCLK << SYSCON_PCLKSEL1_I2C1_SHIFT);
|
||||
putreg32(regval, LPC43_SYSCON_PCLKSEL1);
|
||||
|
||||
lpc43_pin_config(PINCONF_I2C1_SCL);
|
||||
lpc43_pin_config(PINCONF_I2C1_SDA);
|
||||
|
||||
putreg32(LPC43_CCLK/CONFIG_I2C1_FREQ/2, priv->base + LPC43_I2C_SCLH_OFFSET);
|
||||
putreg32(LPC43_CCLK/CONFIG_I2C1_FREQ/2, priv->base + LPC43_I2C_SCLL_OFFSET);
|
||||
}
|
||||
else
|
||||
#endif
|
||||
{
|
||||
return NULL;
|
||||
}
|
||||
|
||||
putreg32(I2C_CONSET_I2EN,priv->base+LPC43_I2C_CONSET_OFFSET);
|
||||
|
||||
sem_init(&priv->mutex, 0, 1);
|
||||
sem_init(&priv->wait, 0, 0);
|
||||
|
||||
/* Allocate a watchdog timer */
|
||||
|
||||
priv->timeout = wd_create();
|
||||
DEBUGASSERT(priv->timeout != 0);
|
||||
|
||||
/* Attach Interrupt Handler */
|
||||
|
||||
irq_attach(priv->irqid, i2c_interrupt);
|
||||
|
||||
/* Enable Interrupt Handler */
|
||||
|
||||
up_enable_irq(priv->irqid);
|
||||
|
||||
/* Install our operations */
|
||||
|
||||
priv->dev.ops = &lpc43_i2c_ops;
|
||||
return (&priv->dev);
|
||||
}
|
||||
|
||||
/*******************************************************************************
|
||||
* Name: up_i2cuninitalize
|
||||
*
|
||||
* Description:
|
||||
* Uninitialise an I2C device
|
||||
*
|
||||
*******************************************************************************/
|
||||
|
||||
int up_i2cuninitialize(FAR struct i2c_dev_s * dev)
|
||||
{
|
||||
struct lpc43_i2cdev_s *priv = (struct lpc43_i2cdev_s *) dev;
|
||||
|
||||
putreg32(I2C_CONCLRT_I2ENC,priv->base+LPC43_I2C_CONCLR_OFFSET);
|
||||
up_disable_irq(priv->irqid);
|
||||
irq_detach(priv->irqid);
|
||||
return (0);
|
||||
}
|
||||
|
||||
#endif
|
Loading…
Reference in New Issue
Block a user