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SAMA5D4-EK: Add logic to disable the faulty PMIC. This must be done with JP23 open. It is perfomed only from the DRAMBOOT loader

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This commit is contained in:
Gregory Nutt 2014-07-28 16:34:19 -06:00
parent 8e20aae28f
commit 5c5477b981
4 changed files with 176 additions and 4 deletions
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4
configs/sama5d4-ek/src/Makefile
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@ -84,6 +84,10 @@ endif
endif
endif
ifeq ($(CONFIG_SAMA5_TWI0),y)
CSRCS += sam_pmic.c
endif
ifeq ($(CONFIG_AUDIO_NULL),y)
CSRCS += sam_audio_null.c
endif

16
configs/sama5d4-ek/src/dram_main.c
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@ -93,13 +93,25 @@ typedef void (*dram_entry_t)(void);
int dram_main(int argc, char *argv)
{
int ret;
/* Here we have a in memory value we can change in the debugger
* to begin booting in NOR Flash
*/
static volatile uint32_t wait = DRAM_BOOT_MODE;
int ret;
/* Disable the PMC. This is necessary on the SAMA5D4-MB Rev C. board. On
* that board, the PMIC can lock up the I2C bus. The work around is
* difficult:
*
* 1. Open JP23 (disabling the WM8904 data line)
* 2. Execute DRAMBOOT. The PMIC will be disabled while JP23 is closed.
* 3. At the prompt to "Send the Intel HEX file now", close JP23
* 4. Send the NuttX file. When NuttX starts, the WM8904 is initialized,
* JP23 will be closed and the PMIC will be initialized.
*/
sam_pmic_initialize()
/* DRAM was already initialized at boot time, so we are ready to load the
* Intel HEX stream into DRAM.

128
configs/sama5d4-ek/src/sam_pmic.c Normal file
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@ -0,0 +1,128 @@
/************************************************************************************
* configs/sama5d4-ek/src/sam_pmic.c
*
* Copyright (C) 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* 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 <stdbool.h>
#include <stdio.h>
#include <debug.h>
#include <assert.h>
#include <errno.h>
#include <nuttx/i2c.h>
#include <arch/board/board.h>
#include "up_arch.h"
#include "sam_twi.h"
#include "sama5d4-ek.h"
#ifdef HAVE_PMIC
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: sam_pmic_initialize
*
* Description:
* Currently, this function only disables the PMIC.
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
****************************************************************************/
void sam_pmic_initialize(void)
{
FAR struct i2c_dev_s *i2c;
uint8_t buffer[2];
/* Get an instance of the I2C interface for the PMIC */
i2c = up_i2cinitialize(PMIC_TWI_BUS);
if (!i2c)
{
dbg("ERROR: Failed to initialize TWI%d\n", PMIC_TWI_BUS);
}
else
{
/* Configure the I2C instance */
(void)I2C_SETADDRESS(i2c, PMIC_I2C_ADDRESS, 7);
(void)I2C_SETFREQUENCY(i2c, PMIC_I2C_FREQUENCY);
/* Send the disable sequence */
buffer[0] = 0x0b;
buffer[1] = 0xee;
(void)I2C_SEND(i2c, buffer, 2);
buffer[0] = 0x02;
buffer[1] = 0x0f;
(void)I2C_SEND(i2c, buffer, 2);
buffer[0] = 0x03;
buffer[1] = 0x0f;
(void)I2C_SEND(i2c, buffer, 2);
}
}
#endif /* HAVE_PMIC */

32
configs/sama5d4-ek/src/sama5d4-ek.h
View File

@ -66,6 +66,7 @@
#define HAVE_MAXTOUCH 1
#define HAVE_WM8904 1
#define HAVE_AUDIO_NULL 1
#define HAVE_PMIC 1
/* HSMCI */
/* Can't support MMC/SD if the card interface(s) are not enable */
@ -369,6 +370,12 @@
# endif
#endif
/* PMIC */
#ifndef CONFIG_SAMA5_TWI0
# undef HAVE_PMIC
#endif
/* LEDs *****************************************************************************/
/* There are 3 LEDs on the SAMA5D4-EK:
*
@ -733,8 +740,9 @@
/* ACT8865 power management chip ****************************************************/
/* The PMIC communicates on TWI0, I2C address 0x5b */
#define PMIC_TWI_BUS 0
#define PMIC_I2C_ADDRESS 0x5b
#define PMIC_TWI_BUS 0
#define PMIC_I2C_ADDRESS 0x5b
#define PMIC_I2C_FREQUENCY 400000 /* 400KHz max */
/************************************************************************************
* Public Types
@ -962,6 +970,26 @@ int sam_wm8904_initialize(int minor);
int sam_audio_null_initialize(int minor);
#endif /* HAVE_AUDIO_NULL */
/****************************************************************************
* Name: sam_pmic_initialize
*
* Description:
* Currently, this function only disables the PMIC.
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
****************************************************************************/
#ifdef HAVE_PMIC
void sam_pmic_initialize(void)
#else
# define sam_pmic_initialize()
#endif
#endif /* __ASSEMBLY__ */
#endif /* __CONFIGS_SAMA5D4_EK_SRC_SAMA5D4_EK_H */