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

/* SPDX-License-Identifier: GPL-2.0-or-later */

/***************************************************************************
 *   Copyright (C) 2006 by Magnus Lundin                                   *
 *   lundin@mlu.mine.nu                                                    *
 *                                                                         *
 *   Copyright (C) 2008 by Spencer Oliver                                  *
 *   spen@spen-soft.co.uk                                                  *
 ***************************************************************************/

/***************************************************************************
* STELLARIS flash is tested on LM3S811, LM3S6965, LM3s3748, more.
***************************************************************************/

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

#include "jtag/interface.h"
#include "imp.h"
#include <target/algorithm.h>
#include <target/arm_adi_v5.h>
#include <target/armv7m.h>

#define DID0_VER(did0) ((did0 >> 28)&0x07)

/* STELLARIS control registers */
#define SCB_BASE	0x400FE000
#define DID0		0x000
#define DID1		0x004
#define DC0			0x008
#define DC1			0x010
#define DC2			0x014
#define DC3			0x018
#define DC4			0x01C

#define RIS			0x050
#define RCC			0x060
#define PLLCFG		0x064
#define RCC2		0x070
#define NVMSTAT		0x1a0

/* "legacy" flash memory protection registers (64KB max) */
#define FMPRE		0x130
#define FMPPE		0x134

/* new flash memory protection registers (for more than 64KB) */
#define FMPRE0		0x200		/* PRE1 = PRE0 + 4, etc */
#define FMPPE0		0x400		/* PPE1 = PPE0 + 4, etc */

#define USECRL		0x140

#define FLASH_CONTROL_BASE	0x400FD000
#define FLASH_FMA	(FLASH_CONTROL_BASE | 0x000)
#define FLASH_FMD	(FLASH_CONTROL_BASE | 0x004)
#define FLASH_FMC	(FLASH_CONTROL_BASE | 0x008)
#define FLASH_CRIS	(FLASH_CONTROL_BASE | 0x00C)
#define FLASH_CIM	(FLASH_CONTROL_BASE | 0x010)
#define FLASH_MISC	(FLASH_CONTROL_BASE | 0x014)
#define FLASH_FSIZE	(FLASH_CONTROL_BASE | 0xFC0)
#define FLASH_SSIZE	(FLASH_CONTROL_BASE | 0xFC4)

#define AMISC	1
#define PMISC	2

#define AMASK	1
#define PMASK	2

/* Flash Controller Command bits */
#define FMC_WRKEY	(0xA442 << 16)
#define FMC_COMT	(1 << 3)
#define FMC_MERASE	(1 << 2)
#define FMC_ERASE	(1 << 1)
#define FMC_WRITE	(1 << 0)

/* STELLARIS constants */

/* values to write in FMA to commit write-"once" values */
#define FLASH_FMA_PRE(x)	(2 * (x))	/* for FMPPREx */
#define FLASH_FMA_PPE(x)	(2 * (x) + 1)	/* for FMPPPEx */

static void stellaris_read_clock_info(struct flash_bank *bank);
static int stellaris_mass_erase(struct flash_bank *bank);

struct stellaris_flash_bank {
	/* chip id register */
	uint32_t did0;
	uint32_t did1;
	uint32_t dc0;
	uint32_t dc1;
	uint32_t fsize;
	uint32_t ssize;

	const char *target_name;
	uint8_t target_class;

	uint32_t sramsiz;
	/* flash geometry */
	uint32_t num_pages;
	uint32_t pagesize;

	/* main clock status */
	uint32_t rcc;
	uint32_t rcc2;
	uint8_t  mck_valid;
	uint8_t  xtal_mask;
	uint32_t iosc_freq;
	uint32_t mck_freq;
	const char *iosc_desc;
	const char *mck_desc;
};

/* Autogenerated by contrib/gen-stellaris-part-header.pl */
/* From Stellaris Firmware Development Package revision 9453 */
static const struct {
	uint8_t class;
	uint8_t partno;
	const char *partname;
} stellaris_parts[] = {
	{0x00, 0x01, "LM3S101"},
	{0x00, 0x02, "LM3S102"},
	{0x01, 0xBF, "LM3S1110"},
	{0x01, 0xC3, "LM3S1133"},
	{0x01, 0xC5, "LM3S1138"},
	{0x01, 0xC1, "LM3S1150"},
	{0x01, 0xC4, "LM3S1162"},
	{0x01, 0xC2, "LM3S1165"},
	{0x01, 0xEC, "LM3S1166"},
	{0x01, 0xC6, "LM3S1332"},
	{0x01, 0xBC, "LM3S1435"},
	{0x01, 0xBA, "LM3S1439"},
	{0x01, 0xBB, "LM3S1512"},
	{0x01, 0xC7, "LM3S1538"},
	{0x01, 0xDB, "LM3S1601"},
	{0x03, 0x06, "LM3S1607"},
	{0x01, 0xDA, "LM3S1608"},
	{0x01, 0xC0, "LM3S1620"},
	{0x04, 0xCD, "LM3S1621"},
	{0x03, 0x03, "LM3S1625"},
	{0x03, 0x04, "LM3S1626"},
	{0x03, 0x05, "LM3S1627"},
	{0x01, 0xB3, "LM3S1635"},
	{0x01, 0xEB, "LM3S1636"},
	{0x01, 0xBD, "LM3S1637"},
	{0x04, 0xB1, "LM3S1651"},
	{0x01, 0xB9, "LM3S1751"},
	{0x03, 0x10, "LM3S1776"},
	{0x04, 0x16, "LM3S1811"},
	{0x04, 0x3D, "LM3S1816"},
	{0x01, 0xB4, "LM3S1850"},
	{0x01, 0xDD, "LM3S1911"},
	{0x01, 0xDC, "LM3S1918"},
	{0x01, 0xB7, "LM3S1937"},
	{0x01, 0xBE, "LM3S1958"},
	{0x01, 0xB5, "LM3S1960"},
	{0x01, 0xB8, "LM3S1968"},
	{0x01, 0xEA, "LM3S1969"},
	{0x04, 0xCE, "LM3S1B21"},
	{0x06, 0xCA, "LM3S1C21"},
	{0x06, 0xCB, "LM3S1C26"},
	{0x06, 0x98, "LM3S1C58"},
	{0x06, 0xB0, "LM3S1D21"},
	{0x06, 0xCC, "LM3S1D26"},
	{0x06, 0x1D, "LM3S1F11"},
	{0x06, 0x1B, "LM3S1F16"},
	{0x06, 0xAF, "LM3S1G21"},
	{0x06, 0x95, "LM3S1G58"},
	{0x06, 0x1E, "LM3S1H11"},
	{0x06, 0x1C, "LM3S1H16"},
	{0x04, 0x0F, "LM3S1J11"},
	{0x04, 0x3C, "LM3S1J16"},
	{0x04, 0x0E, "LM3S1N11"},
	{0x04, 0x3B, "LM3S1N16"},
	{0x04, 0xB2, "LM3S1P51"},
	{0x04, 0x9E, "LM3S1R21"},
	{0x04, 0xC9, "LM3S1R26"},
	{0x04, 0x30, "LM3S1W16"},
	{0x04, 0x2F, "LM3S1Z16"},
	{0x01, 0x51, "LM3S2110"},
	{0x01, 0x84, "LM3S2139"},
	{0x03, 0x39, "LM3S2276"},
	{0x01, 0xA2, "LM3S2410"},
	{0x01, 0x59, "LM3S2412"},
	{0x01, 0x56, "LM3S2432"},
	{0x01, 0x5A, "LM3S2533"},
	{0x01, 0xE1, "LM3S2601"},
	{0x01, 0xE0, "LM3S2608"},
	{0x03, 0x33, "LM3S2616"},
	{0x01, 0x57, "LM3S2620"},
	{0x01, 0x85, "LM3S2637"},
	{0x01, 0x53, "LM3S2651"},
	{0x03, 0x80, "LM3S2671"},
	{0x03, 0x50, "LM3S2678"},
	{0x01, 0xA4, "LM3S2730"},
	{0x01, 0x52, "LM3S2739"},
	{0x03, 0x3A, "LM3S2776"},
	{0x04, 0x6D, "LM3S2793"},
	{0x01, 0xE3, "LM3S2911"},
	{0x01, 0xE2, "LM3S2918"},
	{0x01, 0xED, "LM3S2919"},
	{0x01, 0x54, "LM3S2939"},
	{0x01, 0x8F, "LM3S2948"},
	{0x01, 0x58, "LM3S2950"},
	{0x01, 0x55, "LM3S2965"},
	{0x04, 0x6C, "LM3S2B93"},
	{0x06, 0x94, "LM3S2D93"},
	{0x06, 0x93, "LM3S2U93"},
	{0x00, 0x19, "LM3S300"},
	{0x00, 0x11, "LM3S301"},
	{0x00, 0x1A, "LM3S308"},
	{0x00, 0x12, "LM3S310"},
	{0x00, 0x13, "LM3S315"},
	{0x00, 0x14, "LM3S316"},
	{0x00, 0x17, "LM3S317"},
	{0x00, 0x15, "LM3S328"},
	{0x03, 0x08, "LM3S3634"},
	{0x03, 0x43, "LM3S3651"},
	{0x04, 0xC8, "LM3S3654"},
	{0x03, 0x44, "LM3S3739"},
	{0x03, 0x49, "LM3S3748"},
	{0x03, 0x45, "LM3S3749"},
	{0x04, 0x42, "LM3S3826"},
	{0x04, 0x41, "LM3S3J26"},
	{0x04, 0x40, "LM3S3N26"},
	{0x04, 0x3F, "LM3S3W26"},
	{0x04, 0x3E, "LM3S3Z26"},
	{0x03, 0x81, "LM3S5632"},
	{0x04, 0x0C, "LM3S5651"},
	{0x03, 0x8A, "LM3S5652"},
	{0x04, 0x4D, "LM3S5656"},
	{0x03, 0x91, "LM3S5662"},
	{0x03, 0x96, "LM3S5732"},
	{0x03, 0x97, "LM3S5737"},
	{0x03, 0xA0, "LM3S5739"},
	{0x03, 0x99, "LM3S5747"},
	{0x03, 0xA7, "LM3S5749"},
	{0x03, 0x9A, "LM3S5752"},
	{0x03, 0x9C, "LM3S5762"},
	{0x04, 0x69, "LM3S5791"},
	{0x04, 0x0B, "LM3S5951"},
	{0x04, 0x4E, "LM3S5956"},
	{0x04, 0x68, "LM3S5B91"},
	{0x06, 0x2E, "LM3S5C31"},
	{0x06, 0x2C, "LM3S5C36"},
	{0x06, 0x5E, "LM3S5C51"},
	{0x06, 0x5B, "LM3S5C56"},
	{0x06, 0x5F, "LM3S5D51"},
	{0x06, 0x5C, "LM3S5D56"},
	{0x06, 0x87, "LM3S5D91"},
	{0x06, 0x2D, "LM3S5G31"},
	{0x06, 0x1F, "LM3S5G36"},
	{0x06, 0x5D, "LM3S5G51"},
	{0x06, 0x4F, "LM3S5G56"},
	{0x04, 0x09, "LM3S5K31"},
	{0x04, 0x4A, "LM3S5K36"},
	{0x04, 0x0A, "LM3S5P31"},
	{0x04, 0x48, "LM3S5P36"},
	{0x04, 0xB6, "LM3S5P3B"},
	{0x04, 0x0D, "LM3S5P51"},
	{0x04, 0x4C, "LM3S5P56"},
	{0x04, 0x07, "LM3S5R31"},
	{0x04, 0x4B, "LM3S5R36"},
	{0x04, 0x47, "LM3S5T36"},
	{0x06, 0x7F, "LM3S5U91"},
	{0x04, 0x46, "LM3S5Y36"},
	{0x00, 0x2A, "LM3S600"},
	{0x00, 0x21, "LM3S601"},
	{0x00, 0x2B, "LM3S608"},
	{0x00, 0x22, "LM3S610"},
	{0x01, 0xA1, "LM3S6100"},
	{0x00, 0x23, "LM3S611"},
	{0x01, 0x74, "LM3S6110"},
	{0x00, 0x24, "LM3S612"},
	{0x00, 0x25, "LM3S613"},
	{0x00, 0x26, "LM3S615"},
	{0x00, 0x28, "LM3S617"},
	{0x00, 0x29, "LM3S618"},
	{0x00, 0x27, "LM3S628"},
	{0x01, 0xA5, "LM3S6420"},
	{0x01, 0x82, "LM3S6422"},
	{0x01, 0x75, "LM3S6432"},
	{0x01, 0x76, "LM3S6537"},
	{0x01, 0x71, "LM3S6610"},
	{0x01, 0xE7, "LM3S6611"},
	{0x01, 0xE6, "LM3S6618"},
	{0x01, 0x83, "LM3S6633"},
	{0x01, 0x8B, "LM3S6637"},
	{0x01, 0xA3, "LM3S6730"},
	{0x01, 0x77, "LM3S6753"},
	{0x01, 0xE9, "LM3S6911"},
	{0x01, 0xE8, "LM3S6918"},
	{0x01, 0x89, "LM3S6938"},
	{0x01, 0x72, "LM3S6950"},
	{0x01, 0x78, "LM3S6952"},
	{0x01, 0x73, "LM3S6965"},
	{0x06, 0xAA, "LM3S6C11"},
	{0x06, 0xAC, "LM3S6C65"},
	{0x06, 0x9F, "LM3S6G11"},
	{0x06, 0xAB, "LM3S6G65"},
	{0x00, 0x38, "LM3S800"},
	{0x00, 0x31, "LM3S801"},
	{0x00, 0x39, "LM3S808"},
	{0x00, 0x32, "LM3S811"},
	{0x00, 0x33, "LM3S812"},
	{0x00, 0x34, "LM3S815"},
	{0x00, 0x36, "LM3S817"},
	{0x00, 0x37, "LM3S818"},
	{0x00, 0x35, "LM3S828"},
	{0x01, 0x64, "LM3S8530"},
	{0x01, 0x8E, "LM3S8538"},
	{0x01, 0x61, "LM3S8630"},
	{0x01, 0x63, "LM3S8730"},
	{0x01, 0x8D, "LM3S8733"},
	{0x01, 0x86, "LM3S8738"},
	{0x01, 0x65, "LM3S8930"},
	{0x01, 0x8C, "LM3S8933"},
	{0x01, 0x88, "LM3S8938"},
	{0x01, 0xA6, "LM3S8962"},
	{0x01, 0x62, "LM3S8970"},
	{0x01, 0xD7, "LM3S8971"},
	{0x06, 0xAE, "LM3S8C62"},
	{0x06, 0xAD, "LM3S8G62"},
	{0x04, 0xCF, "LM3S9781"},
	{0x04, 0x67, "LM3S9790"},
	{0x04, 0x6B, "LM3S9792"},
	{0x04, 0x2D, "LM3S9971"},
	{0x04, 0x20, "LM3S9997"},
	{0x04, 0xD0, "LM3S9B81"},
	{0x04, 0x66, "LM3S9B90"},
	{0x04, 0x6A, "LM3S9B92"},
	{0x04, 0x6E, "LM3S9B95"},
	{0x04, 0x6F, "LM3S9B96"},
	{0x04, 0x1D, "LM3S9BN2"},
	{0x04, 0x1E, "LM3S9BN5"},
	{0x04, 0x1F, "LM3S9BN6"},
	{0x06, 0x70, "LM3S9C97"},
	{0x06, 0xA9, "LM3S9D81"},
	{0x06, 0x7E, "LM3S9D90"},
	{0x06, 0x92, "LM3S9D92"},
	{0x06, 0x9D, "LM3S9D96"},
	{0x06, 0x7B, "LM3S9DN5"},
	{0x06, 0x7C, "LM3S9DN6"},
	{0x06, 0x60, "LM3S9G97"},
	{0x06, 0x79, "LM3S9GN5"},
	{0x04, 0x1B, "LM3S9L71"},
	{0x04, 0x18, "LM3S9L97"},
	{0x06, 0xA8, "LM3S9U81"},
	{0x06, 0x7D, "LM3S9U90"},
	{0x06, 0x90, "LM3S9U92"},
	{0x06, 0x9B, "LM3S9U96"},
	{0x05, 0x01, "LM4F120B2QR/TM4C1233C3PM"},
	{0x05, 0x02, "LM4F120C4QR/TM4C1233D5PM"},
	{0x05, 0x03, "LM4F120E5QR/TM4C1233E6PM"},
	{0x05, 0x04, "LM4F120H5QR/TM4C1233H6PM"},
	{0x05, 0x08, "LM4F121B2QR/TM4C1232C3PM"},
	{0x05, 0x09, "LM4F121C4QR/TM4C1232D5PM"},
	{0x05, 0x0A, "LM4F121E5QR/TM4C1232E6PM"},
	{0x05, 0x0B, "LM4F121H5QR/TM4C1232H6PM"},
	{0x05, 0x10, "LM4F110E5QR/TM4C1231E6PM"},
	{0x05, 0x11, "LM4F110H5QR/TM4C1231H6PM"},
	{0x05, 0x18, "LM4F110B2QR/TM4C1231C3PM"},
	{0x05, 0x19, "LM4F110C4QR/TM4C1231D5PM"},
	{0x05, 0x20, "LM4F111E5QR/TM4C1230E6PM"},
	{0x05, 0x21, "LM4F111H5QR/TM4C1230H6PM"},
	{0x05, 0x22, "LM4F111B2QR/TM4C1230C3PM"},
	{0x05, 0x23, "LM4F111C4QR/TM4C1230D5PM"},
	{0x05, 0x30, "LM4F112E5QC/TM4C1231E6PZ"},
	{0x05, 0x31, "LM4F112H5QC/TM4C1231H6PZ"},
	{0x05, 0x35, "LM4F112H5QD/TM4C1231H6PGE"},
	{0x05, 0x36, "LM4F112C4QC/TM4C1231D5PZ"},
	{0x05, 0x40, "LM4F130E5QR/TM4C1237E6PM"},
	{0x05, 0x41, "LM4F130H5QR/TM4C1237H6PM"},
	{0x05, 0x48, "LM4F130C4QR/TM4C1237D5PM"},
	{0x05, 0x50, "LM4F131E5QR/TM4C1236E6PM"},
	{0x05, 0x51, "LM4F131H5QR/TM4C1236H6PM"},
	{0x05, 0x52, "LM4F131C4QR/TM4C1236D5PM"},
	{0x05, 0x60, "LM4F132E5QC/TM4C1237E6PZ"},
	{0x05, 0x61, "LM4F132H5QC/TM4C1237H6PZ"},
	{0x05, 0x65, "LM4F132H5QD/TM4C1237H6PGE"},
	{0x05, 0x66, "LM4F132C4QC/TM4C1237D5PZ"},
	{0x05, 0x70, "LM4F210E5QR/TM4C123BE6PM"},
	{0x05, 0x73, "LM4F210H5QR/TM4C123BH6PM"},
	{0x05, 0x80, "LM4F211E5QR/TM4C123AE6PM"},
	{0x05, 0x83, "LM4F211H5QR/TM4C123AH6PM"},
	{0x05, 0xA0, "LM4F230E5QR/TM4C123GE6PM"},
	{0x05, 0xA1, "LM4F230H5QR/TM4C123GH6PM"},
	{0x05, 0xB0, "LM4F231E5QR/TM4C123FE6PM"},
	{0x05, 0xB1, "LM4F231H5QR/TM4C123FH6PM"},
	{0x05, 0xC0, "LM4F232E5QC/TM4C123GE6PZ"},
	{0x05, 0xC1, "LM4F232H5QC/TM4C123GH6PZ"},
	{0x05, 0xC3, "LM4F212E5QC/TM4C123BE6PZ"},
	{0x05, 0xC4, "LM4F212H5QC/TM4C123BH6PZ"},
	{0x05, 0xC5, "LM4F232H5QD/TM4C123GH6PGE"},
	{0x05, 0xC6, "LM4F212H5QD/TM4C123BH6PGE"},
	{0x05, 0xD0, "LM4F122C4QC/TM4C1233D5PZ"},
	{0x05, 0xD1, "LM4F122E5QC/TM4C1233E6PZ"},
	{0x05, 0xD2, "LM4F122H5QC/TM4C1233H6PZ"},
	{0x05, 0xD6, "LM4F122H5QD/TM4C1233H6PGE"},
	{0x05, 0xE1, "LM4FSXLH5BB"},
	{0x05, 0xE3, "LM4F232H5BB/TM4C123GH6ZRB"},
	{0x05, 0xE4, "LM4FS99H5BB"},
	{0x05, 0xE5, "LM4FS1AH5BB"},
	{0x05, 0xE9, "LM4F212H5BB/TM4C123BH6ZRB"},
	{0x05, 0xEA, "LM4FS1GH5BB"},
	{0x05, 0xF0, "TM4C123GH6ZXR"},
	{0x0A, 0x19, "TM4C1290NCPDT"},
	{0x0A, 0x1B, "TM4C1290NCZAD"},
	{0x0A, 0x1C, "TM4C1292NCPDT"},
	{0x0A, 0x1E, "TM4C1292NCZAD"},
	{0x0A, 0x1F, "TM4C1294NCPDT"},
	{0x0A, 0x21, "TM4C1294NCZAD"},
	{0x0A, 0x22, "TM4C1297NCZAD"},
	{0x0A, 0x23, "TM4C1299NCZAD"},
	{0x0A, 0x24, "TM4C129CNCPDT"},
	{0x0A, 0x26, "TM4C129CNCZAD"},
	{0x0A, 0x27, "TM4C129DNCPDT"},
	{0x0A, 0x29, "TM4C129DNCZAD"},
	{0x0A, 0x2D, "TM4C129ENCPDT"},
	{0x0A, 0x2F, "TM4C129ENCZAD"},
	{0x0A, 0x30, "TM4C129LNCZAD"},
	{0x0A, 0x32, "TM4C129XNCZAD"},
	{0x0A, 0x34, "TM4C1294KCPDT"},
	{0x0A, 0x35, "TM4C129EKCPDT"},
	{0x0A, 0x36, "TM4C1299KCZAD"},
	{0x0A, 0x37, "TM4C129XKCZAD"},
	{0xFF, 0x00, "Unknown Part"}
};

static const char * const stellaris_classname[] = {
	"Sandstorm",
	"Fury",
	"Unknown",
	"DustDevil",
	"Tempest",
	"Blizzard/TM4C123x",
	"Firestorm",
	"",
	"",
	"",
	"Snowflake",
};

/***************************************************************************
*	openocd command interface                                              *
***************************************************************************/

/* flash_bank stellaris <base> <size> 0 0 <target#>
 */
FLASH_BANK_COMMAND_HANDLER(stellaris_flash_bank_command)
{
	struct stellaris_flash_bank *stellaris_info;

	if (CMD_ARGC < 6)
		return ERROR_COMMAND_SYNTAX_ERROR;

	stellaris_info = calloc(sizeof(struct stellaris_flash_bank), 1);
	bank->base = 0x0;
	bank->driver_priv = stellaris_info;

	stellaris_info->target_name = "Unknown target";

	/* part wasn't probed for info yet */
	stellaris_info->did1 = 0;

	/* TODO Specify the main crystal speed in kHz using an optional
	 * argument; ditto, the speed of an external oscillator used
	 * instead of a crystal.  Avoid programming flash using IOSC.
	 */
	return ERROR_OK;
}

static int get_stellaris_info(struct flash_bank *bank, struct command_invocation *cmd)
{
	struct stellaris_flash_bank *stellaris_info = bank->driver_priv;

	if (stellaris_info->did1 == 0)
		return ERROR_FLASH_BANK_NOT_PROBED;

	/* Read main and master clock frequency register */
	stellaris_read_clock_info(bank);

	command_print_sameline(cmd,
			"\nTI/LMI Stellaris information: Chip is "
			"class %i (%s) %s rev %c%i\n",
			stellaris_info->target_class,
			stellaris_classname[stellaris_info->target_class],
			stellaris_info->target_name,
			(int)('A' + ((stellaris_info->did0 >> 8) & 0xFF)),
			(int)((stellaris_info->did0) & 0xFF));

	command_print_sameline(cmd,
			"did1: 0x%8.8" PRIx32 ", arch: 0x%4.4" PRIx32
			", eproc: %s, ramsize: %" PRIu32 "k, flashsize: %" PRIu32 "k\n",
			stellaris_info->did1,
			stellaris_info->did1,
			"ARMv7M",
			stellaris_info->sramsiz,
			(uint32_t)(stellaris_info->num_pages * stellaris_info->pagesize / 1024));

	command_print_sameline(cmd,
			"master clock: %ikHz%s, "
			"rcc is 0x%" PRIx32 ", rcc2 is 0x%" PRIx32 ", "
			"pagesize: %" PRIu32 ", pages: %" PRIu32,
			(int)(stellaris_info->mck_freq / 1000),
			stellaris_info->mck_desc,
			stellaris_info->rcc,
			stellaris_info->rcc2,
			stellaris_info->pagesize,
			stellaris_info->num_pages);

	return ERROR_OK;
}

/***************************************************************************
*	chip identification and status                                         *
***************************************************************************/

/* Set the flash timing register to match current clocking */
static void stellaris_set_flash_timing(struct flash_bank *bank)
{
	struct stellaris_flash_bank *stellaris_info = bank->driver_priv;
	struct target *target = bank->target;
	uint32_t usecrl = (stellaris_info->mck_freq/1000000ul-1);

	/* only valid for Sandstorm and Fury class devices */
	if (stellaris_info->target_class > 1)
		return;

	LOG_DEBUG("usecrl = %i", (int)(usecrl));
	target_write_u32(target, SCB_BASE | USECRL, usecrl);
}

static const unsigned rcc_xtal[32] = {
	[0x00] = 1000000,		/* no pll */
	[0x01] = 1843200,		/* no pll */
	[0x02] = 2000000,		/* no pll */
	[0x03] = 2457600,		/* no pll */

	[0x04] = 3579545,
	[0x05] = 3686400,
	[0x06] = 4000000,		/* usb */
	[0x07] = 4096000,

	[0x08] = 4915200,
	[0x09] = 5000000,		/* usb */
	[0x0a] = 5120000,
	[0x0b] = 6000000,		/* (reset) usb */

	[0x0c] = 6144000,
	[0x0d] = 7372800,
	[0x0e] = 8000000,		/* usb */
	[0x0f] = 8192000,

	/* parts before DustDevil use just 4 bits for xtal spec */

	[0x10] = 10000000,		/* usb */
	[0x11] = 12000000,		/* usb */
	[0x12] = 12288000,
	[0x13] = 13560000,

	[0x14] = 14318180,
	[0x15] = 16000000,		/* usb */
	[0x16] = 16384000,
};

/** Read clock configuration and set stellaris_info->usec_clocks. */
static void stellaris_read_clock_info(struct flash_bank *bank)
{
	struct stellaris_flash_bank *stellaris_info = bank->driver_priv;
	struct target *target = bank->target;
	uint32_t rcc, rcc2, pllcfg, sysdiv, usesysdiv, bypass, oscsrc;
	unsigned xtal;
	unsigned long mainfreq;

	target_read_u32(target, SCB_BASE | RCC, &rcc);
	LOG_DEBUG("Stellaris RCC %" PRIx32 "", rcc);

	target_read_u32(target, SCB_BASE | RCC2, &rcc2);
	LOG_DEBUG("Stellaris RCC2 %" PRIx32 "", rcc);

	target_read_u32(target, SCB_BASE | PLLCFG, &pllcfg);
	LOG_DEBUG("Stellaris PLLCFG %" PRIx32 "", pllcfg);

	stellaris_info->rcc = rcc;
	stellaris_info->rcc2 = rcc2;

	sysdiv = (rcc >> 23) & 0xF;
	usesysdiv = (rcc >> 22) & 0x1;
	bypass = (rcc >> 11) & 0x1;
	oscsrc = (rcc >> 4) & 0x3;
	xtal = (rcc >> 6) & stellaris_info->xtal_mask;

	/* NOTE: post-Sandstorm parts have RCC2 which may override
	 * parts of RCC ... with more sysdiv options, option for
	 * 32768 Hz mainfreq, PLL controls.  On Sandstorm it reads
	 * as zero, so the "use RCC2" flag is always clear.
	 */
	if (rcc2 & (1 << 31)) {
		sysdiv = (rcc2 >> 23) & 0x3F;
		bypass = (rcc2 >> 11) & 0x1;
		oscsrc = (rcc2 >> 4) & 0x7;

		/* FIXME Tempest parts have an additional lsb for
		 * fractional sysdiv (200 MHz / 2.5 == 80 MHz)
		 */
	}

	stellaris_info->mck_desc = "";

	switch (oscsrc) {
		case 0:				/* MOSC */
			mainfreq = rcc_xtal[xtal];
			break;
		case 1:				/* IOSC */
			mainfreq = stellaris_info->iosc_freq;
			stellaris_info->mck_desc = stellaris_info->iosc_desc;
			break;
		case 2:				/* IOSC/4 */
			mainfreq = stellaris_info->iosc_freq / 4;
			stellaris_info->mck_desc = stellaris_info->iosc_desc;
			break;
		case 3:				/* lowspeed */
			/* Sandstorm doesn't have this 30K +/- 30% osc */
			mainfreq = 30000;
			stellaris_info->mck_desc = " (±30%)";
			break;
		case 8:				/* hibernation osc */
			/* not all parts support hibernation */
			mainfreq = 32768;
			break;

		default: /* NOTREACHED */
			mainfreq = 0;
			break;
	}

	/* PLL is used if it's not bypassed; its output is 200 MHz
	 * even when it runs at 400 MHz (adds divide-by-two stage).
	 */
	if (!bypass)
		mainfreq = 200000000;

	if (usesysdiv)
		stellaris_info->mck_freq = mainfreq/(1 + sysdiv);
	else
		stellaris_info->mck_freq = mainfreq;
}

/* Read device id register, main clock frequency register and fill in driver info structure */
static int stellaris_read_part_info(struct flash_bank *bank)
{
	struct stellaris_flash_bank *stellaris_info = bank->driver_priv;
	struct target *target = bank->target;
	uint32_t did0, did1, ver, fam;
	int i;

	/* Read and parse chip identification register */
	target_read_u32(target, SCB_BASE | DID0, &did0);
	target_read_u32(target, SCB_BASE | DID1, &did1);
	target_read_u32(target, SCB_BASE | DC0, &stellaris_info->dc0);
	target_read_u32(target, SCB_BASE | DC1, &stellaris_info->dc1);
	LOG_DEBUG("did0 0x%" PRIx32 ", did1 0x%" PRIx32 ", dc0 0x%" PRIx32 ", dc1 0x%" PRIx32 "",
		  did0, did1, stellaris_info->dc0, stellaris_info->dc1);

	ver = DID0_VER(did0);
	if ((ver != 0) && (ver != 1)) {
		LOG_WARNING("Unknown did0 version, cannot identify target");
		return ERROR_FLASH_OPERATION_FAILED;
	}

	if (did1 == 0) {
		LOG_WARNING("Cannot identify target as a Stellaris");
		return ERROR_FLASH_OPERATION_FAILED;
	}

	ver = did1 >> 28;
	fam = (did1 >> 24) & 0xF;
	if (((ver != 0) && (ver != 1)) || (fam != 0)) {
		LOG_WARNING("Unknown did1 version/family.");
		return ERROR_FLASH_OPERATION_FAILED;
	}

	/* For Sandstorm, Fury, DustDevil:  current data sheets say IOSC
	 * is 12 MHz, but some older parts have 15 MHz.  A few data sheets
	 * even give _both_ numbers!  We'll use current numbers; IOSC is
	 * always approximate.
	 *
	 * For Tempest:  IOSC is calibrated, 16 MHz
	 * For Blizzard:  IOSC is calibrated, 16 MHz
	 * For Firestorm:  IOSC is calibrated, 16 MHz
	 */
	stellaris_info->iosc_freq = 12000000;
	stellaris_info->iosc_desc = " (±30%)";
	stellaris_info->xtal_mask = 0x0f;

	/* get device class */
	if (DID0_VER(did0) > 0) {
		stellaris_info->target_class = (did0 >> 16) & 0xFF;
	} else {
		/* Sandstorm class */
		stellaris_info->target_class = 0;
	}

	switch (stellaris_info->target_class) {
		case 0:				/* Sandstorm */
			/*
			 * Current (2009-August) parts seem to be rev C2 and use 12 MHz.
			 * Parts before rev C0 used 15 MHz; some C0 parts use 15 MHz
			 * (LM3S618), but some other C0 parts are 12 MHz (LM3S811).
			 */
			if (((did0 >> 8) & 0xff) < 2) {
				stellaris_info->iosc_freq = 15000000;
				stellaris_info->iosc_desc = " (±50%)";
			}
			break;

		case 1:			/* Fury */
			break;

		case 4:			/* Tempest */
		case 5:			/* Blizzard */
		case 6:			/* Firestorm */
		case 0xa:		/* Snowflake */
			stellaris_info->iosc_freq = 16000000;	/* +/- 1% */
			stellaris_info->iosc_desc = " (±1%)";
			/* FALL THROUGH */

		case 3:			/* DustDevil */
			stellaris_info->xtal_mask = 0x1f;
			break;

		default:
			LOG_WARNING("Unknown did0 class");
	}

	for (i = 0; stellaris_parts[i].partno; i++) {
		if ((stellaris_parts[i].partno == ((did1 >> 16) & 0xFF)) &&
				(stellaris_parts[i].class == stellaris_info->target_class))
			break;
	}

	stellaris_info->target_name = stellaris_parts[i].partname;

	stellaris_info->did0 = did0;
	stellaris_info->did1 = did1;

	if (stellaris_info->target_class == 5) { /* Blizzard */
		target_read_u32(target, FLASH_FSIZE, &stellaris_info->fsize);
		target_read_u32(target, FLASH_SSIZE, &stellaris_info->ssize);

		stellaris_info->num_pages = 2 * (1 + (stellaris_info->fsize & 0xFFFF));
		stellaris_info->sramsiz = (1 + (stellaris_info->ssize & 0xFFFF)) / 4;
		stellaris_info->pagesize = 1024;
	} else if (stellaris_info->target_class == 0xa) { /* Snowflake */
		target_read_u32(target, FLASH_FSIZE, &stellaris_info->fsize);
		target_read_u32(target, FLASH_SSIZE, &stellaris_info->ssize);

		stellaris_info->pagesize = (1 << ((stellaris_info->fsize >> 16) & 7)) * 1024;
		stellaris_info->num_pages = 2048 * (1 + (stellaris_info->fsize & 0xFFFF)) /
			stellaris_info->pagesize;
		stellaris_info->sramsiz = (1 + (stellaris_info->ssize & 0xFFFF)) / 4;
	} else {
		stellaris_info->num_pages = 2 * (1 + (stellaris_info->dc0 & 0xFFFF));
		stellaris_info->sramsiz = (1 + ((stellaris_info->dc0 >> 16) & 0xFFFF)) / 4;
		stellaris_info->pagesize = 1024;
	}

	/* REVISIT for at least Tempest parts, read NVMSTAT.FWB too.
	 * That exposes a 32-word Flash Write Buffer ... enabling
	 * writes of more than one word at a time.
	 */

	return ERROR_OK;
}

/***************************************************************************
*	flash operations                                                       *
***************************************************************************/

static int stellaris_protect_check(struct flash_bank *bank)
{
	struct stellaris_flash_bank *stellaris = bank->driver_priv;
	struct target *target = bank->target;
	uint32_t flash_sizek = stellaris->pagesize / 1024 *
		stellaris->num_pages;
	uint32_t fmppe_addr;
	int status = ERROR_OK;

	if (stellaris->did1 == 0)
		return ERROR_FLASH_BANK_NOT_PROBED;

	for (unsigned int i = 0; i < bank->num_sectors; i++)
		bank->sectors[i].is_protected = -1;

	/* Read each Flash Memory Protection Program Enable (FMPPE) register
	 * to report any pages that we can't write.  Ignore the Read Enable
	 * register (FMPRE).
	 */

	if (stellaris->target_class >= 0x0a || flash_sizek > 64)
		fmppe_addr = SCB_BASE | FMPPE0;
	else
		fmppe_addr = SCB_BASE | FMPPE;

	unsigned int page = 0, lockbitnum, lockbitcnt = flash_sizek / 2;
	unsigned int bits_per_page = stellaris->pagesize / 2048;
	/* Every lock bit always corresponds to a 2k region */
	for (lockbitnum = 0; lockbitnum < lockbitcnt; lockbitnum += 32) {
		uint32_t fmppe;

		target_read_u32(target, fmppe_addr, &fmppe);
		for (unsigned int i = 0; i < 32 && lockbitnum + i < lockbitcnt; i++) {
			bool protect = !(fmppe & (1 << i));
			if (bits_per_page) {
				bank->sectors[page++].is_protected = protect;
				i += bits_per_page - 1;
			} else { /* 1024k pages, every lockbit covers 2 pages */
				bank->sectors[page++].is_protected = protect;
				bank->sectors[page++].is_protected = protect;
			}
		}
		fmppe_addr += 4;
	}

	return status;
}

static int stellaris_erase(struct flash_bank *bank, unsigned int first,
		unsigned int last)
{
	uint32_t flash_fmc, flash_cris;
	struct stellaris_flash_bank *stellaris_info = bank->driver_priv;
	struct target *target = bank->target;

	if (bank->target->state != TARGET_HALTED) {
		LOG_ERROR("Target not halted");
		return ERROR_TARGET_NOT_HALTED;
	}

	if (stellaris_info->did1 == 0)
		return ERROR_FLASH_BANK_NOT_PROBED;

	if ((last < first) || (last >= stellaris_info->num_pages))
		return ERROR_FLASH_SECTOR_INVALID;

	if ((first == 0) && (last == (stellaris_info->num_pages - 1)))
		return stellaris_mass_erase(bank);

	/* Refresh flash controller timing */
	stellaris_read_clock_info(bank);
	stellaris_set_flash_timing(bank);

	/* Clear and disable flash programming interrupts */
	target_write_u32(target, FLASH_CIM, 0);
	target_write_u32(target, FLASH_MISC, PMISC | AMISC);

	/* REVISIT this clobbers state set by any halted firmware ...
	 * it might want to process those IRQs.
	 */

	for (unsigned int banknr = first; banknr <= last; banknr++) {
		/* Address is first word in page */
		target_write_u32(target, FLASH_FMA, banknr * stellaris_info->pagesize);
		/* Write erase command */
		target_write_u32(target, FLASH_FMC, FMC_WRKEY | FMC_ERASE);
		/* Wait until erase complete */
		do {
			target_read_u32(target, FLASH_FMC, &flash_fmc);
		} while (flash_fmc & FMC_ERASE);

		/* Check access violations */
		target_read_u32(target, FLASH_CRIS, &flash_cris);
		if (flash_cris & (AMASK)) {
			LOG_WARNING("Error erasing flash page %i,  flash_cris 0x%" PRIx32 "",
					banknr, flash_cris);
			target_write_u32(target, FLASH_CRIS, 0);
			return ERROR_FLASH_OPERATION_FAILED;
		}
	}

	return ERROR_OK;
}

static int stellaris_protect(struct flash_bank *bank, int set,
		unsigned int first, unsigned int last)
{
	struct stellaris_flash_bank *stellaris = bank->driver_priv;
	struct target *target = bank->target;
	uint32_t flash_fmc, flash_cris;
	unsigned int bits_per_page = stellaris->pagesize / 2048;

	if (target->state != TARGET_HALTED) {
		LOG_ERROR("Target not halted");
		return ERROR_TARGET_NOT_HALTED;
	}

	if (!set) {
		LOG_ERROR("Hardware doesn't support page-level unprotect. "
			"Try the 'recover' command.");
		return ERROR_COMMAND_SYNTAX_ERROR;
	}

	if (stellaris->did1 == 0)
		return ERROR_FLASH_BANK_NOT_PROBED;

	if (stellaris->target_class == 0x03 &&
	    !((stellaris->did0 >> 8) & 0xFF) &&
	    !((stellaris->did0) & 0xFF)) {
		LOG_ERROR("DustDevil A0 parts can't be unprotected, see errata; refusing to proceed");
		return ERROR_FLASH_OPERATION_FAILED;
	}

	if (!bits_per_page && (first % 2 || !(last % 2))) {
		LOG_ERROR("Can't protect unaligned pages");
		return ERROR_FLASH_SECTOR_INVALID;
	}

	/* Refresh flash controller timing */
	stellaris_read_clock_info(bank);
	stellaris_set_flash_timing(bank);

	/* Clear and disable flash programming interrupts */
	target_write_u32(target, FLASH_CIM, 0);
	target_write_u32(target, FLASH_MISC, PMISC | AMISC);

	uint32_t flash_sizek = stellaris->pagesize / 1024 *
		stellaris->num_pages;
	uint32_t fmppe_addr;

	if (stellaris->target_class >= 0x0a || flash_sizek > 64)
		fmppe_addr = SCB_BASE | FMPPE0;
	else
		fmppe_addr = SCB_BASE | FMPPE;

	unsigned int page = 0;
	unsigned int lockbitnum, lockbitcnt = flash_sizek / 2;
	/* Every lock bit always corresponds to a 2k region */
	for (lockbitnum = 0; lockbitnum < lockbitcnt; lockbitnum += 32) {
		uint32_t fmppe;

		target_read_u32(target, fmppe_addr, &fmppe);
		for (unsigned int i = 0;
		     i < 32 && lockbitnum + i < lockbitcnt;
		     i++) {
			if (page >= first && page <= last)
				fmppe &= ~(1 << i);

			if (bits_per_page) {
				if (!((i + 1) % bits_per_page))
					page++;
			} else { /* 1024k pages, every lockbit covers 2 pages */
				page += 2;
			}
		}
		target_write_u32(target, fmppe_addr, fmppe);

		/* Commit FMPPE* */
		target_write_u32(target, FLASH_FMA, 1 + lockbitnum / 16);
		/* Write commit command */
		target_write_u32(target, FLASH_FMC, FMC_WRKEY | FMC_COMT);

		/* Wait until commit complete */
		do {
			target_read_u32(target, FLASH_FMC, &flash_fmc);
		} while (flash_fmc & FMC_COMT);

		/* Check access violations */
		target_read_u32(target, FLASH_CRIS, &flash_cris);
		if (flash_cris & (AMASK)) {
			LOG_WARNING("Error setting flash page protection,  flash_cris 0x%" PRIx32 "", flash_cris);
			target_write_u32(target, FLASH_CRIS, 0);
			return ERROR_FLASH_OPERATION_FAILED;
		}

		fmppe_addr += 4;
	}

	return ERROR_OK;
}

/* see contrib/loaders/flash/stellaris.s for src */

static const uint8_t stellaris_write_code[] = {
								/* write: */
	0xDF, 0xF8, 0x40, 0x40,		/* ldr		r4, pFLASH_CTRL_BASE */
	0xDF, 0xF8, 0x40, 0x50,		/* ldr		r5, FLASHWRITECMD */
								/* wait_fifo: */
	0xD0, 0xF8, 0x00, 0x80,		/* ldr		r8, [r0, #0] */
	0xB8, 0xF1, 0x00, 0x0F,		/* cmp		r8, #0 */
	0x17, 0xD0,					/* beq		exit */
	0x47, 0x68,					/* ldr		r7, [r0, #4] */
	0x47, 0x45,					/* cmp		r7, r8 */
	0xF7, 0xD0,					/* beq		wait_fifo */
								/* mainloop: */
	0x22, 0x60,					/* str		r2, [r4, #0] */
	0x02, 0xF1, 0x04, 0x02,		/* add		r2, r2, #4 */
	0x57, 0xF8, 0x04, 0x8B,		/* ldr		r8, [r7], #4 */
	0xC4, 0xF8, 0x04, 0x80,		/* str		r8, [r4, #4] */
	0xA5, 0x60,					/* str		r5, [r4, #8] */
								/* busy: */
	0xD4, 0xF8, 0x08, 0x80,		/* ldr		r8, [r4, #8] */
	0x18, 0xF0, 0x01, 0x0F,		/* tst		r8, #1 */
	0xFA, 0xD1,					/* bne		busy */
	0x8F, 0x42,					/* cmp		r7, r1 */
	0x28, 0xBF,					/* it		cs */
	0x00, 0xF1, 0x08, 0x07,		/* addcs	r7, r0, #8 */
	0x47, 0x60,					/* str		r7, [r0, #4] */
	0x01, 0x3B,					/* subs		r3, r3, #1 */
	0x03, 0xB1,					/* cbz		r3, exit */
	0xE2, 0xE7,					/* b		wait_fifo */
								/* exit: */
	0x00, 0xBE,					/* bkpt		#0 */

	/* pFLASH_CTRL_BASE: */
	0x00, 0xD0, 0x0F, 0x40,	/* .word	0x400FD000 */
	/* FLASHWRITECMD: */
	0x01, 0x00, 0x42, 0xA4	/* .word	0xA4420001 */
};
static int stellaris_write_block(struct flash_bank *bank,
		const uint8_t *buffer, uint32_t offset, uint32_t wcount)
{
	struct target *target = bank->target;
	uint32_t buffer_size = 16384;
	struct working_area *source;
	struct working_area *write_algorithm;
	uint32_t address = bank->base + offset;
	struct reg_param reg_params[4];
	struct armv7m_algorithm armv7m_info;
	int retval = ERROR_OK;

	/* power of two, and multiple of word size */
	static const unsigned buf_min = 128;

	/* for small buffers it's faster not to download an algorithm */
	if (wcount * 4 < buf_min)
		return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;

	LOG_DEBUG("(bank=%p buffer=%p offset=%08" PRIx32 " wcount=%08" PRIx32 "",
			bank, buffer, offset, wcount);

	/* flash write code */
	if (target_alloc_working_area(target, sizeof(stellaris_write_code),
			&write_algorithm) != ERROR_OK) {
		LOG_DEBUG("no working area for block memory writes");
		return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
	}

	/* plus a buffer big enough for this data */
	if (wcount * 4 < buffer_size)
		buffer_size = wcount * 4;

	/* memory buffer */
	while (target_alloc_working_area_try(target, buffer_size, &source) != ERROR_OK) {
		buffer_size /= 2;
		if (buffer_size <= buf_min) {
			target_free_working_area(target, write_algorithm);
			return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
		}
		LOG_DEBUG("retry target_alloc_working_area(%s, size=%u)",
				target_name(target), (unsigned) buffer_size);
	}

	target_write_buffer(target, write_algorithm->address,
			sizeof(stellaris_write_code),
			stellaris_write_code);

	armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
	armv7m_info.core_mode = ARM_MODE_THREAD;

	init_reg_param(&reg_params[0], "r0", 32, PARAM_OUT);
	init_reg_param(&reg_params[1], "r1", 32, PARAM_OUT);
	init_reg_param(&reg_params[2], "r2", 32, PARAM_OUT);
	init_reg_param(&reg_params[3], "r3", 32, PARAM_OUT);

	buf_set_u32(reg_params[0].value, 0, 32, source->address);
	buf_set_u32(reg_params[1].value, 0, 32, source->address + source->size);
	buf_set_u32(reg_params[2].value, 0, 32, address);
	buf_set_u32(reg_params[3].value, 0, 32, wcount);

	retval = target_run_flash_async_algorithm(target, buffer, wcount, 4,
			0, NULL,
			4, reg_params,
			source->address, source->size,
			write_algorithm->address, 0,
			&armv7m_info);

	if (retval == ERROR_FLASH_OPERATION_FAILED)
		LOG_ERROR("error %d executing stellaris flash write algorithm", retval);

	target_free_working_area(target, write_algorithm);
	target_free_working_area(target, source);

	destroy_reg_param(&reg_params[0]);
	destroy_reg_param(&reg_params[1]);
	destroy_reg_param(&reg_params[2]);
	destroy_reg_param(&reg_params[3]);

	return retval;
}

static int stellaris_write(struct flash_bank *bank, const uint8_t *buffer,
		uint32_t offset, uint32_t count)
{
	struct stellaris_flash_bank *stellaris_info = bank->driver_priv;
	struct target *target = bank->target;
	uint32_t address = offset;
	uint32_t flash_cris, flash_fmc;
	uint32_t words_remaining = (count / 4);
	uint32_t bytes_remaining = (count & 0x00000003);
	uint32_t bytes_written = 0;
	int retval;

	if (bank->target->state != TARGET_HALTED) {
		LOG_ERROR("Target not halted");
		return ERROR_TARGET_NOT_HALTED;
	}

	LOG_DEBUG("(bank=%p buffer=%p offset=%08" PRIx32 " count=%08" PRIx32 "",
			bank, buffer, offset, count);

	if (stellaris_info->did1 == 0)
		return ERROR_FLASH_BANK_NOT_PROBED;

	if (offset & 0x3) {
		LOG_WARNING("offset size must be word aligned");
		return ERROR_FLASH_DST_BREAKS_ALIGNMENT;
	}

	if (offset + count > bank->size)
		return ERROR_FLASH_DST_OUT_OF_BANK;

	/* Refresh flash controller timing */
	stellaris_read_clock_info(bank);
	stellaris_set_flash_timing(bank);

	/* Clear and disable flash programming interrupts */
	target_write_u32(target, FLASH_CIM, 0);
	target_write_u32(target, FLASH_MISC, PMISC | AMISC);

	/* REVISIT this clobbers state set by any halted firmware ...
	 * it might want to process those IRQs.
	 */

	/* multiple words to be programmed? */
	if (words_remaining > 0) {
		/* try using a block write */
		retval = stellaris_write_block(bank, buffer, offset,
				words_remaining);
		if (retval != ERROR_OK) {
			if (retval == ERROR_TARGET_RESOURCE_NOT_AVAILABLE) {
				LOG_DEBUG("writing flash word-at-a-time");
			} else if (retval == ERROR_FLASH_OPERATION_FAILED) {
				/* if an error occurred, we examine the reason, and quit */
				target_read_u32(target, FLASH_CRIS, &flash_cris);

				LOG_ERROR("flash writing failed with CRIS: 0x%" PRIx32 "", flash_cris);
				return ERROR_FLASH_OPERATION_FAILED;
			}
		} else {
			buffer += words_remaining * 4;
			address += words_remaining * 4;
			words_remaining = 0;
		}
	}

	while (words_remaining > 0) {
		if (!(address & 0xff))
			LOG_DEBUG("0x%" PRIx32 "", address);

		/* Program one word */
		target_write_u32(target, FLASH_FMA, address);
		target_write_buffer(target, FLASH_FMD, 4, buffer);
		target_write_u32(target, FLASH_FMC, FMC_WRKEY | FMC_WRITE);
		/* LOG_DEBUG("0x%x 0x%x 0x%x",address,buf_get_u32(buffer, 0, 32),FMC_WRKEY | FMC_WRITE); */
		/* Wait until write complete */
		do {
			target_read_u32(target, FLASH_FMC, &flash_fmc);
		} while (flash_fmc & FMC_WRITE);

		buffer += 4;
		address += 4;
		words_remaining--;
	}

	if (bytes_remaining) {
		uint8_t last_word[4] = {0xff, 0xff, 0xff, 0xff};

		/* copy the last remaining bytes into the write buffer */
		memcpy(last_word, buffer+bytes_written, bytes_remaining);

		if (!(address & 0xff))
			LOG_DEBUG("0x%" PRIx32 "", address);

		/* Program one word */
		target_write_u32(target, FLASH_FMA, address);
		target_write_buffer(target, FLASH_FMD, 4, last_word);
		target_write_u32(target, FLASH_FMC, FMC_WRKEY | FMC_WRITE);
		/* LOG_DEBUG("0x%x 0x%x 0x%x",address,buf_get_u32(buffer, 0, 32),FMC_WRKEY | FMC_WRITE); */
		/* Wait until write complete */
		do {
			target_read_u32(target, FLASH_FMC, &flash_fmc);
		} while (flash_fmc & FMC_WRITE);
	}

	/* Check access violations */
	target_read_u32(target, FLASH_CRIS, &flash_cris);
	if (flash_cris & (AMASK)) {
		LOG_DEBUG("flash_cris 0x%" PRIx32 "", flash_cris);
		return ERROR_FLASH_OPERATION_FAILED;
	}
	return ERROR_OK;
}

static int stellaris_probe(struct flash_bank *bank)
{
	struct stellaris_flash_bank *stellaris_info = bank->driver_priv;
	int retval;

	/* If this is a stellaris chip, it has flash; probe() is just
	 * to figure out how much is present.  Only do it once.
	 */
	if (stellaris_info->did1 != 0)
		return ERROR_OK;

	/* stellaris_read_part_info() already handled error checking and
	 * reporting.  Note that it doesn't write, so we don't care about
	 * whether the target is halted or not.
	 */
	retval = stellaris_read_part_info(bank);
	if (retval != ERROR_OK)
		return retval;

	free(bank->sectors);

	/* provide this for the benefit of the NOR flash framework */
	bank->size = stellaris_info->num_pages * stellaris_info->pagesize;
	bank->num_sectors = stellaris_info->num_pages;
	bank->sectors = calloc(bank->num_sectors, sizeof(struct flash_sector));
	for (unsigned int i = 0; i < bank->num_sectors; i++) {
		bank->sectors[i].offset = i * stellaris_info->pagesize;
		bank->sectors[i].size = stellaris_info->pagesize;
		bank->sectors[i].is_erased = -1;
		bank->sectors[i].is_protected = -1;
	}

	return retval;
}

static int stellaris_mass_erase(struct flash_bank *bank)
{
	struct target *target = NULL;
	struct stellaris_flash_bank *stellaris_info = NULL;
	uint32_t flash_fmc;

	stellaris_info = bank->driver_priv;
	target = bank->target;

	if (target->state != TARGET_HALTED) {
		LOG_ERROR("Target not halted");
		return ERROR_TARGET_NOT_HALTED;
	}

	if (stellaris_info->did1 == 0)
		return ERROR_FLASH_BANK_NOT_PROBED;

	/* Refresh flash controller timing */
	stellaris_read_clock_info(bank);
	stellaris_set_flash_timing(bank);

	/* Clear and disable flash programming interrupts */
	target_write_u32(target, FLASH_CIM, 0);
	target_write_u32(target, FLASH_MISC, PMISC | AMISC);

	/* REVISIT this clobbers state set by any halted firmware ...
	 * it might want to process those IRQs.
	 */

	target_write_u32(target, FLASH_FMA, 0);
	target_write_u32(target, FLASH_FMC, FMC_WRKEY | FMC_MERASE);
	/* Wait until erase complete */
	do {
		target_read_u32(target, FLASH_FMC, &flash_fmc);
	} while (flash_fmc & FMC_MERASE);

	/* if device has > 128k, then second erase cycle is needed
	 * this is only valid for older devices, but will not hurt */
	if (stellaris_info->num_pages * stellaris_info->pagesize > 0x20000) {
		target_write_u32(target, FLASH_FMA, 0x20000);
		target_write_u32(target, FLASH_FMC, FMC_WRKEY | FMC_MERASE);
		/* Wait until erase complete */
		do {
			target_read_u32(target, FLASH_FMC, &flash_fmc);
		} while (flash_fmc & FMC_MERASE);
	}

	return ERROR_OK;
}

COMMAND_HANDLER(stellaris_handle_mass_erase_command)
{
	if (CMD_ARGC < 1)
		return ERROR_COMMAND_SYNTAX_ERROR;

	struct flash_bank *bank;
	int retval = CALL_COMMAND_HANDLER(flash_command_get_bank, 0, &bank);
	if (retval != ERROR_OK)
		return retval;

	if (stellaris_mass_erase(bank) == ERROR_OK)
		command_print(CMD, "stellaris mass erase complete");
	else
		command_print(CMD, "stellaris mass erase failed");

	return ERROR_OK;
}

/**
 * Perform the Stellaris "Recovering a 'Locked' Device procedure.
 * This performs a mass erase and then restores all nonvolatile registers
 * (including USER_* registers and flash lock bits) to their defaults.
 * Accordingly, flash can be reprogrammed, and JTAG can be used.
 *
 * NOTE that DustDevil parts (at least rev A0 silicon) have errata which
 * can affect this operation if flash protection has been enabled.
 */
COMMAND_HANDLER(stellaris_handle_recover_command)
{
	struct flash_bank *bank;
	struct arm *arm;
	int retval;

	if (CMD_ARGC != 0)
		return ERROR_COMMAND_SYNTAX_ERROR;

	bank = get_flash_bank_by_num_noprobe(0);
	if (!bank)
		return ERROR_FAIL;

	/* REVISIT ... it may be worth sanity checking that the AP is
	 * inactive before we start.  ARM documents that switching a DP's
	 * mode while it's active can cause fault modes that need a power
	 * cycle to recover.
	 */

	Jim_Eval_Named(CMD_CTX->interp, "catch { hla_command \"debug unlock\" }", 0, 0);
	if (!strcmp(Jim_GetString(Jim_GetResult(CMD_CTX->interp), NULL), "0")) {
		retval = ERROR_OK;
		goto user_action;
	}

	/* assert SRST */
	if (!(jtag_get_reset_config() & RESET_HAS_SRST)) {
		LOG_ERROR("Can't recover Stellaris flash without SRST");
		return ERROR_FAIL;
	}
	adapter_assert_reset();

	arm = target_to_arm(bank->target);
	for (int i = 0; i < 5; i++) {
		retval = dap_to_swd(arm->dap);
		if (retval != ERROR_OK)
			goto done;

		retval = dap_to_jtag(arm->dap);
		if (retval != ERROR_OK)
			goto done;
	}

	/* de-assert SRST */
	adapter_deassert_reset();
	retval = jtag_execute_queue();

	/* wait 400+ msec ... OK, "1+ second" is simpler */
	usleep(1000);

user_action:
	/* USER INTERVENTION required for the power cycle
	 * Restarting OpenOCD is likely needed because of mode switching.
	 */
	LOG_INFO("USER ACTION:  "
		"power cycle Stellaris chip, then restart OpenOCD.");

done:
	return retval;
}

static const struct command_registration stellaris_exec_command_handlers[] = {
	{
		.name = "mass_erase",
		.usage = "<bank>",
		.handler = stellaris_handle_mass_erase_command,
		.mode = COMMAND_EXEC,
		.help = "erase entire device",
	},
	{
		.name = "recover",
		.handler = stellaris_handle_recover_command,
		.mode = COMMAND_EXEC,
		.usage = "",
		.help = "recover (and erase) locked device",
	},
	COMMAND_REGISTRATION_DONE
};
static const struct command_registration stellaris_command_handlers[] = {
	{
		.name = "stellaris",
		.mode = COMMAND_EXEC,
		.help = "Stellaris flash command group",
		.usage = "",
		.chain = stellaris_exec_command_handlers,
	},
	COMMAND_REGISTRATION_DONE
};

const struct flash_driver stellaris_flash = {
	.name = "stellaris",
	.commands = stellaris_command_handlers,
	.flash_bank_command = stellaris_flash_bank_command,
	.erase = stellaris_erase,
	.protect = stellaris_protect,
	.write = stellaris_write,
	.read = default_flash_read,
	.probe = stellaris_probe,
	.auto_probe = stellaris_probe,
	.erase_check = default_flash_blank_check,
	.protect_check = stellaris_protect_check,
	.info = get_stellaris_info,
	.free_driver_priv = default_flash_free_driver_priv,
};