path: root/src/flash/nor/at91sam7.c

/***************************************************************************
 *   Copyright (C) 2006 by Magnus Lundin                                   *
 *   lundin@mlu.mine.nu                                                    *
 *                                                                         *
 *   Copyright (C) 2008 by Gheorghe Guran (atlas)                          *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>. *
****************************************************************************/

/***************************************************************************
*
* New flash setup command:
*
* flash bank <driver> <base_addr> <size> <chip_width> <bus_width> <target_id>
*	[<chip_type> <banks>
*	 <sectors_per_bank> <pages_per_sector>
*	 <page_size> <num_nvmbits>
*	 <ext_freq_khz>]
*
*   <ext_freq_khz> - MUST be used if clock is from external source,
*                    CAN be used if main oscillator frequency is known (recommended)
* Examples:
* ==== RECOMMENDED (covers clock speed) ============
*  flash bank at91sam7 0x00100000 0 0 4 $_TARGETNAME AT91SAM7XC256 1 16 64 256 3 25000
*			(if auto-detect fails; provides clock spec)
*  flash bank at91sam7 0 0 0 0 $_TARGETNAME 0 0 0 0 0 0 25000
*			(auto-detect everything except the clock)
* ==== NOT RECOMMENDED !!! (clock speed is not configured) ====
*  flash bank at91sam7 0x00100000 0 0 4 $_TARGETNAME AT91SAM7XC256 1 16 64 256 3 0
*			(if auto-detect fails)
*  flash bank at91sam7 0 0 0 0 $_TARGETNAME
*			(old style, auto-detect everything)
****************************************************************************/

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "imp.h"
#include <helper/binarybuffer.h>

/* AT91SAM7 control registers */
#define DBGU_CIDR                       0xFFFFF240
#define CKGR_MCFR                       0xFFFFFC24
#define CKGR_MOR                        0xFFFFFC20
#define CKGR_MCFR_MAINRDY       0x10000
#define CKGR_PLLR                       0xFFFFFC2c
#define CKGR_PLLR_DIV           0xff
#define CKGR_PLLR_MUL           0x07ff0000
#define PMC_MCKR                        0xFFFFFC30
#define PMC_MCKR_CSS            0x03
#define PMC_MCKR_PRES           0x1c

/* Flash Controller Commands */
#define WP              0x01
#define SLB             0x02
#define WPL             0x03
#define CLB             0x04
#define EA              0x08
#define SGPB    0x0B
#define CGPB    0x0D
#define SSB             0x0F

/* MC_FSR bit definitions */
#define MC_FSR_FRDY                     1
#define MC_FSR_EOL                      2

/* AT91SAM7 constants */
#define RC_FREQ                         32000

/* Flash timing modes */
#define FMR_TIMING_NONE         0
#define FMR_TIMING_NVBITS       1
#define FMR_TIMING_FLASH        2

/* Flash size constants */
#define FLASH_SIZE_8KB          1
#define FLASH_SIZE_16KB         2
#define FLASH_SIZE_32KB         3
#define FLASH_SIZE_64KB         5
#define FLASH_SIZE_128KB        7
#define FLASH_SIZE_256KB        9
#define FLASH_SIZE_512KB        10
#define FLASH_SIZE_1024KB       12
#define FLASH_SIZE_2048KB       14

static int at91sam7_protect_check(struct flash_bank *bank);
static int at91sam7_write(struct flash_bank *bank, const uint8_t *buffer, uint32_t offset,
		uint32_t count);

static uint32_t at91sam7_get_flash_status(struct target *target, int bank_number);
static void at91sam7_set_flash_mode(struct flash_bank *bank, int mode);
static uint32_t at91sam7_wait_status_busy(struct flash_bank *bank, uint32_t waitbits, int timeout);
static int at91sam7_flash_command(struct flash_bank *bank, uint8_t cmd, uint16_t pagen);

static const uint32_t MC_FMR[4] = { 0xFFFFFF60, 0xFFFFFF70, 0xFFFFFF80, 0xFFFFFF90 };
static const uint32_t MC_FCR[4] = { 0xFFFFFF64, 0xFFFFFF74, 0xFFFFFF84, 0xFFFFFF94 };
static const uint32_t MC_FSR[4] = { 0xFFFFFF68, 0xFFFFFF78, 0xFFFFFF88, 0xFFFFFF98 };

static const char *EPROC[8] = {
	"Unknown", "ARM946-E", "ARM7TDMI", "Unknown", "ARM920T", "ARM926EJ-S", "Unknown", "Unknown"
};

struct at91sam7_flash_bank {
	/* chip id register */
	uint32_t cidr;
	uint16_t cidr_ext;
	uint16_t cidr_nvptyp;
	uint16_t cidr_arch;
	uint16_t cidr_sramsiz;
	uint16_t cidr_nvpsiz;
	uint16_t cidr_nvpsiz2;
	uint16_t cidr_eproc;
	uint16_t cidr_version;
	const char *target_name;

	/* flash auto-detection */
	uint8_t flash_autodetection;

	/* flash geometry */
	uint16_t pages_per_sector;
	uint16_t pagesize;
	uint16_t pages_in_lockregion;

	/* nv memory bits */
	uint16_t num_lockbits_on;
	uint16_t lockbits;
	uint16_t num_nvmbits;
	uint16_t num_nvmbits_on;
	uint16_t nvmbits;
	uint8_t securitybit;

	/* 0: not init
	 * 1: fmcn for nvbits (1uS)
	 * 2: fmcn for flash (1.5uS) */
	uint8_t flashmode;

	/* main clock status */
	uint8_t mck_valid;
	uint32_t mck_freq;

	/* external clock frequency */
	uint32_t ext_freq;

};

#if 0
static long SRAMSIZ[16] = {
	-1,
	0x0400,		/*  1K */
	0x0800,		/*  2K */
	-1,
	0x1c000,	/* 112K */
	0x1000,		/*   4K */
	0x14000,	/*  80K */
	0x28000,	/* 160K */
	0x2000,		/*   8K */
	0x4000,		/*  16K */
	0x8000,		/*  32K */
	0x10000,	/*  64K */
	0x20000,	/* 128K */
	0x40000,	/* 256K */
	0x18000,	/*  96K */
	0x80000,	/* 512K */
};
#endif

static uint32_t at