forked from Archive/PX4-Autopilot
675 lines
24 KiB
C
675 lines
24 KiB
C
/************************************************************************************
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* drivers/mtd/ramtron.c
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* Driver for SPI-based RAMTRON NVRAM Devices FM25V10 and others (not tested)
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*
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* Copyright (C) 2011 Uros Platise. All rights reserved.
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* Copyright (C) 2009-2010, 2012 Gregory Nutt. All rights reserved.
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* Author: Uros Platise <uros.platise@isotel.eu>
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* 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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/* OPTIONS:
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* - additional non-jedec standard device: FM25H20
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* must be enabled with the CONFIG_RAMTRON_FRAM_NON_JEDEC=y
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*
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* NOTE:
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* - frequency is fixed to desired max by RAMTRON_INIT_CLK_MAX
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* if new devices with different speed arrive, then SETFREQUENCY()
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* needs to handle freq changes and INIT_CLK_MAX must be reduced
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* to fit all devices. Note that STM32_SPI driver is prone to
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* too high freq. parameters and limit it within physical constraints.
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*
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* TODO:
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* - add support for sleep
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* - add support for faster read FSTRD command
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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 <errno.h>
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#include <debug.h>
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#include <assert.h>
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#include <nuttx/kmalloc.h>
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#include <nuttx/fs/ioctl.h>
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#include <nuttx/spi.h>
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#include <nuttx/mtd.h>
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/************************************************************************************
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* Pre-processor Definitions
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************************************************************************************/
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/* RAMTRON devices are flat!
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* For purpose of the VFAT file system we emulate the following configuration:
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*/
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#define RAMTRON_EMULATE_SECTOR_SHIFT 9
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#define RAMTRON_EMULATE_PAGE_SHIFT 9
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/* RAMTRON Indentification register values */
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#define RAMTRON_MANUFACTURER 0x7F
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#define RAMTRON_MEMORY_TYPE 0xC2
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/* Instructions:
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* Command Value N Description Addr Dummy Data */
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#define RAMTRON_WREN 0x06 /* 1 Write Enable 0 0 0 */
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#define RAMTRON_WRDI 0x04 /* 1 Write Disable 0 0 0 */
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#define RAMTRON_RDSR 0x05 /* 1 Read Status Register 0 0 >=1 */
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#define RAMTRON_WRSR 0x01 /* 1 Write Status Register 0 0 1 */
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#define RAMTRON_READ 0x03 /* 1 Read Data Bytes A 0 >=1 */
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#define RAMTRON_FSTRD 0x0b /* 1 Higher speed read A 1 >=1 */
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#define RAMTRON_WRITE 0x02 /* 1 Write A 0 1-256 */
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#define RAMTRON_SLEEP 0xb9 // TODO:
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#define RAMTRON_RDID 0x9f /* 1 Read Identification 0 0 1-3 */
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#define RAMTRON_SN 0xc3 // TODO:
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/* Status register bit definitions */
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#define RAMTRON_SR_WIP (1 << 0) /* Bit 0: Write in progress bit */
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#define RAMTRON_SR_WEL (1 << 1) /* Bit 1: Write enable latch bit */
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#define RAMTRON_SR_BP_SHIFT (2) /* Bits 2-4: Block protect bits */
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#define RAMTRON_SR_BP_MASK (7 << RAMTRON_SR_BP_SHIFT)
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# define RAMTRON_SR_BP_NONE (0 << RAMTRON_SR_BP_SHIFT) /* Unprotected */
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# define RAMTRON_SR_BP_UPPER64th (1 << RAMTRON_SR_BP_SHIFT) /* Upper 64th */
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# define RAMTRON_SR_BP_UPPER32nd (2 << RAMTRON_SR_BP_SHIFT) /* Upper 32nd */
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# define RAMTRON_SR_BP_UPPER16th (3 << RAMTRON_SR_BP_SHIFT) /* Upper 16th */
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# define RAMTRON_SR_BP_UPPER8th (4 << RAMTRON_SR_BP_SHIFT) /* Upper 8th */
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# define RAMTRON_SR_BP_UPPERQTR (5 << RAMTRON_SR_BP_SHIFT) /* Upper quarter */
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# define RAMTRON_SR_BP_UPPERHALF (6 << RAMTRON_SR_BP_SHIFT) /* Upper half */
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# define RAMTRON_SR_BP_ALL (7 << RAMTRON_SR_BP_SHIFT) /* All sectors */
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#define RAMTRON_SR_SRWD (1 << 7) /* Bit 7: Status register write protect */
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#define RAMTRON_DUMMY 0xa5
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/************************************************************************************
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* Private Types
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************************************************************************************/
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struct ramtron_parts_s
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{
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const char *name;
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uint8_t id1;
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uint8_t id2;
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uint32_t size;
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uint8_t addr_len;
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uint32_t speed;
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};
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/* This type represents the state of the MTD device. The struct mtd_dev_s
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* must appear at the beginning of the definition so that you can freely
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* cast between pointers to struct mtd_dev_s and struct ramtron_dev_s.
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*/
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struct ramtron_dev_s
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{
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struct mtd_dev_s mtd; /* MTD interface */
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FAR struct spi_dev_s *dev; /* Saved SPI interface instance */
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uint8_t sectorshift;
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uint8_t pageshift;
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uint16_t nsectors;
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uint32_t npages;
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const struct ramtron_parts_s *part; /* part instance */
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};
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/************************************************************************************
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* Supported Part Lists
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************************************************************************************/
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// Defines the initial speed compatible with all devices. In case of RAMTRON
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// the defined devices within the part list have all the same speed.
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#define RAMTRON_INIT_CLK_MAX 40000000UL
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static struct ramtron_parts_s ramtron_parts[] =
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{
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{
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"FM25V02", /* name */
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0x22, /* id1 */
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0x00, /* id2 */
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32L*1024L, /* size */
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2, /* addr_len */
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40000000 /* speed */
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},
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{
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"FM25VN02", /* name */
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0x22, /* id1 */
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0x01, /* id2 */
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32L*1024L, /* size */
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2, /* addr_len */
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40000000 /* speed */
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},
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{
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"FM25V05", /* name */
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0x23, /* id1 */
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0x00, /* id2 */
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64L*1024L, /* size */
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2, /* addr_len */
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40000000 /* speed */
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},
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{
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"FM25VN05", /* name */
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0x23, /* id1 */
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0x01, /* id2 */
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64L*1024L, /* size */
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2, /* addr_len */
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40000000 /* speed */
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},
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{
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"FM25V10", /* name */
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0x24, /* id1 */
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0x00, /* id2 */
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128L*1024L, /* size */
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3, /* addr_len */
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40000000 /* speed */
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},
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{
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"FM25VN10", /* name */
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0x24, /* id1 */
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0x01, /* id2 */
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128L*1024L, /* size */
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3, /* addr_len */
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40000000 /* speed */
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},
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#ifdef CONFIG_RAMTRON_FRAM_NON_JEDEC
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{
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"FM25H20", /* name */
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0xff, /* id1 */
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0xff, /* id2 */
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256L*1024L, /* size */
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3, /* addr_len */
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40000000 /* speed */
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},
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{
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NULL, /* name */
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0, /* id1 */
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0, /* id2 */
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0, /* size */
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0, /* addr_len */
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0 /* speed */
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}
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#endif
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};
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/************************************************************************************
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* Private Function Prototypes
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************************************************************************************/
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/* Helpers */
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static void ramtron_lock(FAR struct spi_dev_s *dev);
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static inline void ramtron_unlock(FAR struct spi_dev_s *dev);
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static inline int ramtron_readid(struct ramtron_dev_s *priv);
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static void ramtron_waitwritecomplete(struct ramtron_dev_s *priv);
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static void ramtron_writeenable(struct ramtron_dev_s *priv);
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static inline void ramtron_pagewrite(struct ramtron_dev_s *priv, FAR const uint8_t *buffer,
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off_t offset);
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/* MTD driver methods */
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static int ramtron_erase(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks);
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static ssize_t ramtron_bread(FAR struct mtd_dev_s *dev, off_t startblock,
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size_t nblocks, FAR uint8_t *buf);
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static ssize_t ramtron_bwrite(FAR struct mtd_dev_s *dev, off_t startblock,
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size_t nblocks, FAR const uint8_t *buf);
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static ssize_t ramtron_read(FAR struct mtd_dev_s *dev, off_t offset, size_t nbytes,
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FAR uint8_t *buffer);
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static int ramtron_ioctl(FAR struct mtd_dev_s *dev, int cmd, unsigned long arg);
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/************************************************************************************
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* Private Data
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************************************************************************************/
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/************************************************************************************
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* Private Functions
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************************************************************************************/
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/************************************************************************************
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* Name: ramtron_lock
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************************************************************************************/
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static void ramtron_lock(FAR struct spi_dev_s *dev)
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{
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/* On SPI busses where there are multiple devices, it will be necessary to
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* lock SPI to have exclusive access to the busses for a sequence of
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* transfers. The bus should be locked before the chip is selected.
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*
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* This is a blocking call and will not return until we have exclusiv access to
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* the SPI buss. We will retain that exclusive access until the bus is unlocked.
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*/
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SPI_LOCK(dev, true);
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/* After locking the SPI bus, the we also need call the setfrequency, setbits, and
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* setmode methods to make sure that the SPI is properly configured for the device.
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* If the SPI buss is being shared, then it may have been left in an incompatible
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* state.
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*/
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SPI_SETMODE(dev, SPIDEV_MODE3);
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SPI_SETBITS(dev, 8);
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(void)SPI_SETFREQUENCY(dev, RAMTRON_INIT_CLK_MAX);
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}
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/************************************************************************************
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* Name: ramtron_unlock
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************************************************************************************/
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static inline void ramtron_unlock(FAR struct spi_dev_s *dev)
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{
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SPI_LOCK(dev, false);
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}
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/************************************************************************************
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* Name: ramtron_readid
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************************************************************************************/
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static inline int ramtron_readid(struct ramtron_dev_s *priv)
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{
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uint16_t manufacturer, memory, capacity, part;
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int i;
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fvdbg("priv: %p\n", priv);
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/* Lock the SPI bus, configure the bus, and select this FLASH part. */
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ramtron_lock(priv->dev);
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SPI_SELECT(priv->dev, SPIDEV_FLASH, true);
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/* Send the "Read ID (RDID)" command and read the first three ID bytes */
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(void)SPI_SEND(priv->dev, RAMTRON_RDID);
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for (i=0; i<6; i++) manufacturer = SPI_SEND(priv->dev, RAMTRON_DUMMY);
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memory = SPI_SEND(priv->dev, RAMTRON_DUMMY);
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capacity = SPI_SEND(priv->dev, RAMTRON_DUMMY); // fram.id1
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part = SPI_SEND(priv->dev, RAMTRON_DUMMY); // fram.id2
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/* Deselect the FLASH and unlock the bus */
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SPI_SELECT(priv->dev, SPIDEV_FLASH, false);
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ramtron_unlock(priv->dev);
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// Select part from the part list
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for (priv->part = ramtron_parts;
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priv->part->name != NULL && !(priv->part->id1 == capacity && priv->part->id2 == part);
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priv->part++);
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if (priv->part->name) {
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fvdbg("RAMTRON %s of size %d bytes (mf:%02x mem:%02x cap:%02x part:%02x)\n",
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priv->part->name, priv->part->size, manufacturer, memory, capacity, part);
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priv->sectorshift = RAMTRON_EMULATE_SECTOR_SHIFT;
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priv->nsectors = priv->part->size / (1 << RAMTRON_EMULATE_SECTOR_SHIFT);
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priv->pageshift = RAMTRON_EMULATE_PAGE_SHIFT;
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priv->npages = priv->part->size / (1 << RAMTRON_EMULATE_PAGE_SHIFT);
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return OK;
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}
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fvdbg("RAMTRON device not found\n");
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return -ENODEV;
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}
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/************************************************************************************
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* Name: ramtron_waitwritecomplete
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************************************************************************************/
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static void ramtron_waitwritecomplete(struct ramtron_dev_s *priv)
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{
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uint8_t status;
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/* Select this FLASH part */
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SPI_SELECT(priv->dev, SPIDEV_FLASH, true);
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/* Send "Read Status Register (RDSR)" command */
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(void)SPI_SEND(priv->dev, RAMTRON_RDSR);
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/* Loop as long as the memory is busy with a write cycle */
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do
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{
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/* Send a dummy byte to generate the clock needed to shift out the status */
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status = SPI_SEND(priv->dev, RAMTRON_DUMMY);
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}
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while ((status & RAMTRON_SR_WIP) != 0);
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/* Deselect the FLASH */
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SPI_SELECT(priv->dev, SPIDEV_FLASH, false);
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fvdbg("Complete\n");
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}
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/************************************************************************************
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* Name: ramtron_writeenable
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************************************************************************************/
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static void ramtron_writeenable(struct ramtron_dev_s *priv)
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{
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/* Select this FLASH part */
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SPI_SELECT(priv->dev, SPIDEV_FLASH, true);
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/* Send "Write Enable (WREN)" command */
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(void)SPI_SEND(priv->dev, RAMTRON_WREN);
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/* Deselect the FLASH */
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SPI_SELECT(priv->dev, SPIDEV_FLASH, false);
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fvdbg("Enabled\n");
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}
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/************************************************************************************
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* Name: ramtron_sendaddr
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************************************************************************************/
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static inline void ramtron_sendaddr(const struct ramtron_dev_s *priv, uint32_t addr)
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{
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DEBUGASSERT(priv->part->addr_len == 3 || priv->part->addr_len == 2);
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if (priv->part->addr_len == 3)
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(void)SPI_SEND(priv->dev, (addr >> 16) & 0xff);
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(void)SPI_SEND(priv->dev, (addr >> 8) & 0xff);
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(void)SPI_SEND(priv->dev, addr & 0xff);
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}
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/************************************************************************************
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* Name: ramtron_pagewrite
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************************************************************************************/
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static inline void ramtron_pagewrite(struct ramtron_dev_s *priv, FAR const uint8_t *buffer,
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off_t page)
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{
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off_t offset = page << priv->pageshift;
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fvdbg("page: %08lx offset: %08lx\n", (long)page, (long)offset);
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/* Wait for any preceding write to complete. We could simplify things by
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* perform this wait at the end of each write operation (rather than at
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* the beginning of ALL operations), but have the wait first will slightly
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* improve performance.
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*/
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ramtron_waitwritecomplete(priv);
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/* Enable the write access to the FLASH */
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ramtron_writeenable(priv);
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/* Select this FLASH part */
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SPI_SELECT(priv->dev, SPIDEV_FLASH, true);
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/* Send "Page Program (PP)" command */
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(void)SPI_SEND(priv->dev, RAMTRON_WRITE);
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/* Send the page offset high byte first. */
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ramtron_sendaddr(priv, offset);
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/* Then write the specified number of bytes */
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SPI_SNDBLOCK(priv->dev, buffer, 1 << priv->pageshift);
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/* Deselect the FLASH: Chip Select high */
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SPI_SELECT(priv->dev, SPIDEV_FLASH, false);
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fvdbg("Written\n");
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}
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/************************************************************************************
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* Name: ramtron_erase
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************************************************************************************/
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static int ramtron_erase(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks)
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{
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fvdbg("startblock: %08lx nblocks: %d\n", (long)startblock, (int)nblocks);
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fvdbg("On RAMTRON devices erasing makes no sense, returning as OK\n");
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return (int)nblocks;
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}
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/************************************************************************************
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* Name: ramtron_bread
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************************************************************************************/
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static ssize_t ramtron_bread(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks,
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FAR uint8_t *buffer)
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{
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FAR struct ramtron_dev_s *priv = (FAR struct ramtron_dev_s *)dev;
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ssize_t nbytes;
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fvdbg("startblock: %08lx nblocks: %d\n", (long)startblock, (int)nblocks);
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/* On this device, we can handle the block read just like the byte-oriented read */
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nbytes = ramtron_read(dev, startblock << priv->pageshift, nblocks << priv->pageshift, buffer);
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if (nbytes > 0)
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{
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return nbytes >> priv->pageshift;
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}
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return (int)nbytes;
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}
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/************************************************************************************
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* Name: ramtron_bwrite
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************************************************************************************/
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static ssize_t ramtron_bwrite(FAR struct mtd_dev_s *dev, off_t startblock, size_t nblocks,
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FAR const uint8_t *buffer)
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{
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FAR struct ramtron_dev_s *priv = (FAR struct ramtron_dev_s *)dev;
|
|
size_t blocksleft = nblocks;
|
|
|
|
fvdbg("startblock: %08lx nblocks: %d\n", (long)startblock, (int)nblocks);
|
|
|
|
/* Lock the SPI bus and write each page to FLASH */
|
|
|
|
ramtron_lock(priv->dev);
|
|
while (blocksleft-- > 0)
|
|
{
|
|
ramtron_pagewrite(priv, buffer, startblock);
|
|
startblock++;
|
|
}
|
|
ramtron_unlock(priv->dev);
|
|
|
|
return nblocks;
|
|
}
|
|
|
|
/************************************************************************************
|
|
* Name: ramtron_read
|
|
************************************************************************************/
|
|
|
|
static ssize_t ramtron_read(FAR struct mtd_dev_s *dev, off_t offset, size_t nbytes,
|
|
FAR uint8_t *buffer)
|
|
{
|
|
FAR struct ramtron_dev_s *priv = (FAR struct ramtron_dev_s *)dev;
|
|
|
|
fvdbg("offset: %08lx nbytes: %d\n", (long)offset, (int)nbytes);
|
|
|
|
/* Wait for any preceding write to complete. We could simplify things by
|
|
* perform this wait at the end of each write operation (rather than at
|
|
* the beginning of ALL operations), but have the wait first will slightly
|
|
* improve performance.
|
|
*/
|
|
|
|
ramtron_waitwritecomplete(priv);
|
|
|
|
/* Lock the SPI bus and select this FLASH part */
|
|
|
|
ramtron_lock(priv->dev);
|
|
SPI_SELECT(priv->dev, SPIDEV_FLASH, true);
|
|
|
|
/* Send "Read from Memory " instruction */
|
|
|
|
(void)SPI_SEND(priv->dev, RAMTRON_READ);
|
|
|
|
/* Send the page offset high byte first. */
|
|
|
|
ramtron_sendaddr(priv, offset);
|
|
|
|
/* Then read all of the requested bytes */
|
|
|
|
SPI_RECVBLOCK(priv->dev, buffer, nbytes);
|
|
|
|
/* Deselect the FLASH and unlock the SPI bus */
|
|
|
|
SPI_SELECT(priv->dev, SPIDEV_FLASH, false);
|
|
ramtron_unlock(priv->dev);
|
|
fvdbg("return nbytes: %d\n", (int)nbytes);
|
|
return nbytes;
|
|
}
|
|
|
|
/************************************************************************************
|
|
* Name: ramtron_ioctl
|
|
************************************************************************************/
|
|
|
|
static int ramtron_ioctl(FAR struct mtd_dev_s *dev, int cmd, unsigned long arg)
|
|
{
|
|
FAR struct ramtron_dev_s *priv = (FAR struct ramtron_dev_s *)dev;
|
|
int ret = -EINVAL; /* Assume good command with bad parameters */
|
|
|
|
fvdbg("cmd: %d \n", cmd);
|
|
|
|
switch (cmd)
|
|
{
|
|
case MTDIOC_GEOMETRY:
|
|
{
|
|
FAR struct mtd_geometry_s *geo = (FAR struct mtd_geometry_s *)((uintptr_t)arg);
|
|
if (geo)
|
|
{
|
|
/* Populate the geometry structure with information need to know
|
|
* the capacity and how to access the device.
|
|
*
|
|
* NOTE: that the device is treated as though it where just an array
|
|
* of fixed size blocks. That is most likely not true, but the client
|
|
* will expect the device logic to do whatever is necessary to make it
|
|
* appear so.
|
|
*/
|
|
|
|
geo->blocksize = (1 << priv->pageshift);
|
|
geo->erasesize = (1 << priv->sectorshift);
|
|
geo->neraseblocks = priv->nsectors;
|
|
ret = OK;
|
|
|
|
fvdbg("blocksize: %d erasesize: %d neraseblocks: %d\n",
|
|
geo->blocksize, geo->erasesize, geo->neraseblocks);
|
|
}
|
|
}
|
|
break;
|
|
|
|
case MTDIOC_BULKERASE:
|
|
fvdbg("BULDERASE: Makes no sense in ramtron. Let's confirm operation as OK\n");
|
|
ret = OK;
|
|
break;
|
|
|
|
case MTDIOC_XIPBASE:
|
|
default:
|
|
ret = -ENOTTY; /* Bad command */
|
|
break;
|
|
}
|
|
|
|
fvdbg("return %d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
/************************************************************************************
|
|
* Public Functions
|
|
************************************************************************************/
|
|
|
|
/************************************************************************************
|
|
* Name: ramtron_initialize
|
|
*
|
|
* Description:
|
|
* Create an initialize MTD device instance. MTD devices are not registered
|
|
* in the file system, but are created as instances that can be bound to
|
|
* other functions (such as a block or character driver front end).
|
|
*
|
|
************************************************************************************/
|
|
|
|
FAR struct mtd_dev_s *ramtron_initialize(FAR struct spi_dev_s *dev)
|
|
{
|
|
FAR struct ramtron_dev_s *priv;
|
|
|
|
fvdbg("dev: %p\n", dev);
|
|
|
|
/* Allocate a state structure (we allocate the structure instead of using
|
|
* a fixed, static allocation so that we can handle multiple FLASH devices.
|
|
* The current implementation would handle only one FLASH part per SPI
|
|
* device (only because of the SPIDEV_FLASH definition) and so would have
|
|
* to be extended to handle multiple FLASH parts on the same SPI bus.
|
|
*/
|
|
|
|
priv = (FAR struct ramtron_dev_s *)kmalloc(sizeof(struct ramtron_dev_s));
|
|
if (priv)
|
|
{
|
|
/* Initialize the allocated structure */
|
|
|
|
priv->mtd.erase = ramtron_erase;
|
|
priv->mtd.bread = ramtron_bread;
|
|
priv->mtd.bwrite = ramtron_bwrite;
|
|
priv->mtd.read = ramtron_read;
|
|
priv->mtd.ioctl = ramtron_ioctl;
|
|
priv->dev = dev;
|
|
|
|
/* Deselect the FLASH */
|
|
|
|
SPI_SELECT(dev, SPIDEV_FLASH, false);
|
|
|
|
/* Identify the FLASH chip and get its capacity */
|
|
|
|
if (ramtron_readid(priv) != OK)
|
|
{
|
|
/* Unrecognized! Discard all of that work we just did and return NULL */
|
|
kfree(priv);
|
|
priv = NULL;
|
|
}
|
|
}
|
|
|
|
/* Return the implementation-specific state structure as the MTD device */
|
|
|
|
fvdbg("Return %p\n", priv);
|
|
return (FAR struct mtd_dev_s *)priv;
|
|
}
|