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-/*
- * This file is part of the Black Magic Debug project.
- *
- * Copyright (C) 2014 Richard Meadows <richardeoin>
- *
- * 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 3 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/>.
- */
-
-/* This file implements Atmel SAM D20 target specific functions for
- * detecting the device, providing the XML memory map and Flash memory
- * programming.
- */
-/* Refer to the SAM D20 Datasheet:
- * http://www.atmel.com/Images/Atmel-42129-SAM-D20_Datasheet.pdf
- * particularly Sections 12. DSU and 20. NVMCTRL
- */
-/* TODO: Support for the NVMCTRL Security Bit. If this is set then the
- * device will probably not even be detected.
- */
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-#include "general.h"
-#include "jtagtap.h"
-#include "adiv5.h"
-#include "target.h"
-#include "command.h"
-#include "gdb_packet.h"
-#include "cortexm.h"
-
-static int samd20_flash_erase(struct target_s *target, uint32_t addr, int len);
-static int samd20_flash_write(struct target_s *target, uint32_t dest,
- const uint8_t *src, int len);
-
-static bool samd20_cmd_erase_all(target *t);
-static bool samd20_cmd_lock_flash(target *t);
-static bool samd20_cmd_unlock_flash(target *t);
-static bool samd20_cmd_read_userrow(target *t);
-static bool samd20_cmd_serial(target *t);
-static bool samd20_cmd_mbist(target *t);
-
-const struct command_s samd20_cmd_list[] = {
- {"erase_mass", (cmd_handler)samd20_cmd_erase_all, "Erase entire flash memory"},
- {"lock_flash", (cmd_handler)samd20_cmd_lock_flash, "Locks flash against spurious commands"},
- {"unlock_flash", (cmd_handler)samd20_cmd_unlock_flash, "Unlocks flash"},
- {"user_row", (cmd_handler)samd20_cmd_read_userrow, "Prints user row from flash"},
- {"serial", (cmd_handler)samd20_cmd_serial, "Prints serial number"},
- {"mbist", (cmd_handler)samd20_cmd_mbist, "Runs the built-in memory test"},
- {NULL, NULL, NULL}
-};
-
-/**
- * 256KB Flash Max., 32KB RAM Max. The smallest unit of erase is the
- * one row = 256 bytes.
- */
-static const char samd20_xml_memory_map[] = "<?xml version=\"1.0\"?>"
-/* "<!DOCTYPE memory-map "
- " PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\""
- " \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"*/
- "<memory-map>"
- " <memory type=\"flash\" start=\"0x0\" length=\"0x40000\">"
- " <property name=\"blocksize\">0x100</property>"
- " </memory>"
- " <memory type=\"ram\" start=\"0x20000000\" length=\"0x8000\"/>"
- "</memory-map>";
-
-/* Non-Volatile Memory Controller (NVMC) Parameters */
-#define SAMD20_ROW_SIZE 256
-#define SAMD20_PAGE_SIZE 64
-
-/* Non-Volatile Memory Controller (NVMC) Registers */
-#define SAMD20_NVMC 0x41004000
-#define SAMD20_NVMC_CMD (SAMD20_NVMC + 0x0)
-#define SAMD20_NVMC_PARAM (SAMD20_NVMC + 0x08)
-#define SAMD20_NVMC_INTFLAG (SAMD20_NVMC + 0x14)
-#define SAMD20_NVMC_STATUS (SAMD20_NVMC + 0x18)
-#define SAMD20_NVMC_ADDRESS (SAMD20_NVMC + 0x1C)
-
-/* Command Register (CMD) */
-#define SAMD20_CMD_KEY 0xA500
-#define SAMD20_CMD_ERASEROW 0x0002
-#define SAMD20_CMD_WRITEPAGE 0x0004
-#define SAMD20_CMD_ERASEAUXROW 0x0005
-#define SAMD20_CMD_WRITEAUXPAGE 0x0006
-#define SAMD20_CMD_LOCK 0x0040
-#define SAMD20_CMD_UNLOCK 0x0041
-#define SAMD20_CMD_PAGEBUFFERCLEAR 0x0044
-
-/* Interrupt Flag Register (INTFLAG) */
-#define SAMD20_NVMC_READY (1 << 0)
-
-/* Non-Volatile Memory Calibration and Auxiliary Registers */
-#define SAMD20_NVM_USER_ROW_LOW 0x00804000
-#define SAMD20_NVM_USER_ROW_HIGH 0x00804004
-#define SAMD20_NVM_CALIBRATION 0x00806020
-#define SAMD20_NVM_SERIAL(n) (0x0080A00C + (0x30 * ((n + 3) / 4)) + \
- (0x4 * n))
-
-/* Device Service Unit (DSU) Registers */
-#define SAMD20_DSU 0x41002000
-#define SAMD20_DSU_EXT_ACCESS (SAMD20_DSU + 0x100)
-#define SAMD20_DSU_CTRLSTAT (SAMD20_DSU_EXT_ACCESS + 0x0)
-#define SAMD20_DSU_ADDRESS (SAMD20_DSU_EXT_ACCESS + 0x4)
-#define SAMD20_DSU_LENGTH (SAMD20_DSU_EXT_ACCESS + 0x8)
-#define SAMD20_DSU_DID (SAMD20_DSU_EXT_ACCESS + 0x018)
-#define SAMD20_DSU_PID(n) (SAMD20_DSU + 0x1FE0 + \
- (0x4 * (n % 4)) - (0x10 * (n / 4)))
-#define SAMD20_DSU_CID(n) (SAMD20_DSU + 0x1FF0 + \
- (0x4 * (n % 4)))
-
-/* Control and Status Register (CTRLSTAT) */
-#define SAMD20_CTRL_CHIP_ERASE (1 << 4)
-#define SAMD20_CTRL_MBIST (1 << 3)
-#define SAMD20_CTRL_CRC (1 << 2)
-#define SAMD20_STATUSA_PERR (1 << 12)
-#define SAMD20_STATUSA_FAIL (1 << 11)
-#define SAMD20_STATUSA_BERR (1 << 10)
-#define SAMD20_STATUSA_CRSTEXT (1 << 9)
-#define SAMD20_STATUSA_DONE (1 << 8)
-
-/* Device Identification Register (DID) */
-#define SAMD20_DID_MASK 0xFFBF0000
-#define SAMD20_DID_CONST_VALUE 0x10000000
-#define SAMD20_DID_DEVSEL_MASK 0x0F
-#define SAMD20_DID_DEVSEL_POS 0
-#define SAMD20_DID_REVISION_MASK 0x0F
-#define SAMD20_DID_REVISION_POS 8
-
-/* Peripheral ID */
-#define SAMD20_PID_MASK 0x00F7FFFF
-#define SAMD20_PID_CONST_VALUE 0x0001FCD0
-
-/* Component ID */
-#define SAMD20_CID_VALUE 0xB105100D
-
-/* Utility */
-#define MINIMUM(a,b) ((a < b) ? a : b)
-
-/**
- * Reads the SAM D20 Peripheral ID
- */
-uint64_t samd20_read_pid(struct target_s *target)
-{
- ADIv5_AP_t *ap = adiv5_target_ap(target);
- uint64_t pid = 0;
- uint8_t i, j;
-
- /* Five PID registers to read LSB first */
- for (i = 0, j = 0; i < 5; i++, j += 8)
- pid |= (adiv5_ap_mem_read(ap, SAMD20_DSU_PID(i)) & 0xFF) << j;
-
- return pid;
-}
-/**
- * Reads the SAM D20 Component ID
- */
-uint32_t samd20_read_cid(struct target_s *target)
-{
- ADIv5_AP_t *ap = adiv5_target_ap(target);
- uint64_t cid = 0;
- uint8_t i, j;
-
- /* Four CID registers to read LSB first */
- for (i = 0, j = 0; i < 4; i++, j += 8)
- cid |= (adiv5_ap_mem_read(ap, SAMD20_DSU_CID(i)) & 0xFF) << j;
-
- return cid;
-}
-
-/**
- * Overloads the default cortexm reset function with a version that
- * removes the target from extended reset where required.
- */
-static void
-samd20_reset(struct target_s *target)
-{
- ADIv5_AP_t *ap = adiv5_target_ap(target);
-
- /**
- * SRST is not asserted here as it appears to reset the adiv5
- * logic, meaning that subsequent adiv5_* calls PLATFORM_FATAL_ERROR.
- *
- * This is ok as normally you can just connect the debugger and go,
- * but if that's not possible (protection or SWCLK being used for
- * something else) then having SWCLK low on reset should get you
- * debug access (cold-plugging). TODO: Confirm this
- *
- * See the SAM D20 datasheet §12.6 Debug Operation for more
- * details.
- *
- * jtagtap_srst(true);
- * jtagtap_srst(false);
- */
-
- /* Read DHCSR here to clear S_RESET_ST bit before reset */
- adiv5_ap_mem_read(ap, CORTEXM_DHCSR);
-
- /* Request system reset from NVIC: SRST doesn't work correctly */
- /* This could be VECTRESET: 0x05FA0001 (reset only core)
- * or SYSRESETREQ: 0x05FA0004 (system reset)
- */
- adiv5_ap_mem_write(ap, CORTEXM_AIRCR,
- CORTEXM_AIRCR_VECTKEY | CORTEXM_AIRCR_SYSRESETREQ);
-
- /* Exit extended reset */
- if (adiv5_ap_mem_read(ap, SAMD20_DSU_CTRLSTAT) &
- SAMD20_STATUSA_CRSTEXT) {
- /* Write bit to clear from extended reset */
- adiv5_ap_mem_write(ap, SAMD20_DSU_CTRLSTAT,
- SAMD20_STATUSA_CRSTEXT);
- }
-
- /* Poll for release from reset */
- while(adiv5_ap_mem_read(ap, CORTEXM_DHCSR) & CORTEXM_DHCSR_S_RESET_ST);
-
- /* Reset DFSR flags */
- adiv5_ap_mem_write(ap, CORTEXM_DFSR, CORTEXM_DFSR_RESETALL);
-
- /* Clear any target errors */
- target_check_error(target);
-}
-
-/**
- * Overloads the default cortexm detached function with a version that
- * removes the target from extended reset where required.
- *
- * Only required for SAM D20 _Revision B_ Silicon
- */
-static void
-samd20_revB_detach(struct target_s *target)
-{
- ADIv5_AP_t *ap = adiv5_target_ap(target);
- cortexm_detach(target);
-
- /* ---- Additional ---- */
- /* Exit extended reset */
- if (adiv5_ap_mem_read(ap, SAMD20_DSU_CTRLSTAT) &
- SAMD20_STATUSA_CRSTEXT) {
- /* Write bit to clear from extended reset */
- adiv5_ap_mem_write(ap, SAMD20_DSU_CTRLSTAT,
- SAMD20_STATUSA_CRSTEXT);
- }
-}
-
-/**
- * Overloads the default cortexm halt_resume function with a version
- * that removes the target from extended reset where required.
- *
- * Only required for SAM D20 _Revision B_ Silicon
- */
-static void
-samd20_revB_halt_resume(struct target_s *target, bool step)
-{
- ADIv5_AP_t *ap = adiv5_target_ap(target);
- cortexm_halt_resume(target, step);
-
- /* ---- Additional ---- */
- /* Exit extended reset */
- if (adiv5_ap_mem_read(ap, SAMD20_DSU_CTRLSTAT) &
- SAMD20_STATUSA_CRSTEXT) {
- /* Write bit to clear from extended reset */
- adiv5_ap_mem_write(ap, SAMD20_DSU_CTRLSTAT,
- SAMD20_STATUSA_CRSTEXT);
- }
-}
-
-
-char variant_string[30];
-bool samd20_probe(struct target_s *target)
-{
- ADIv5_AP_t *ap = adiv5_target_ap(target);
- uint32_t cid = samd20_read_cid(target);
- uint32_t pid = samd20_read_pid(target);
-
- /* Check the ARM Coresight Component and Perhiperal IDs */
- if (cid == SAMD20_CID_VALUE &&
- (pid & SAMD20_PID_MASK) == SAMD20_PID_CONST_VALUE) {
-
- /* Read the Device ID */
- uint32_t did = adiv5_ap_mem_read(ap, SAMD20_DSU_DID);
-
- /* If the Device ID matches */
- if ((did & SAMD20_DID_MASK) == SAMD20_DID_CONST_VALUE) {
-
- uint8_t devsel = (did >> SAMD20_DID_DEVSEL_POS)
- & SAMD20_DID_DEVSEL_MASK;
- uint8_t revision = (did >> SAMD20_DID_REVISION_POS)
- & SAMD20_DID_REVISION_MASK;
-
- /* Pin Variant */
- char pin_variant;
- switch (devsel / 5) {
- case 0: pin_variant = 'J'; break;
- case 1: pin_variant = 'G'; break;
- case 2: pin_variant = 'E'; break;
- default: pin_variant = 'u'; break;
- }
-
- /* Mem Variant */
- uint8_t mem_variant = 18 - (devsel % 5);
-
- /* Revision */
- char revision_variant = 'A' + revision;
-
- /* Part String */
- sprintf(variant_string, "Atmel SAMD20%c%dA (rev %c)",
- pin_variant, mem_variant, revision_variant);
-
- /* Setup Target */
- target->driver = variant_string;
- target->reset = samd20_reset;
-
- if (revision_variant == 'B') {
- /**
- * These functions check for and
- * extended reset. Appears to be
- * related to Errata 35.4.1 ref 12015
- */
- target->detach = samd20_revB_detach;
- target->halt_resume = samd20_revB_halt_resume;
- }
-
- target->xml_mem_map = samd20_xml_memory_map;
- target->flash_erase = samd20_flash_erase;
- target->flash_write = samd20_flash_write;
- target_add_commands(target, samd20_cmd_list, "SAMD20");
-
- /* If we're not in reset here */
- if (!connect_assert_srst) {
- /* We'll have to release the target from
- * extended reset to make attach possible */
- if (adiv5_ap_mem_read(ap, SAMD20_DSU_CTRLSTAT) &
- SAMD20_STATUSA_CRSTEXT) {
-
- /* Write bit to clear from extended reset */
- adiv5_ap_mem_write(ap, SAMD20_DSU_CTRLSTAT,
- SAMD20_STATUSA_CRSTEXT);
- }
- }
-
- return true;
- }
- }
-
- return false;
-}
-
-/**
- * Temporary (until next reset) flash memory locking / unlocking
- */
-static void samd20_lock_current_address(struct target_s *target)
-{
- ADIv5_AP_t *ap = adiv5_target_ap(target);
-
- /* Issue the unlock command */
- adiv5_ap_mem_write(ap, SAMD20_NVMC_CMD, SAMD20_CMD_KEY | SAMD20_CMD_LOCK);
-}
-static void samd20_unlock_current_address(struct target_s *target)
-{
- ADIv5_AP_t *ap = adiv5_target_ap(target);
-
- /* Issue the unlock command */
- adiv5_ap_mem_write(ap, SAMD20_NVMC_CMD, SAMD20_CMD_KEY | SAMD20_CMD_UNLOCK);
-}
-
-/**
- * Erase flash row by row
- */
-static int samd20_flash_erase(struct target_s *target, uint32_t addr, int len)
-{
- ADIv5_AP_t *ap = adiv5_target_ap(target);
-
- addr &= ~(SAMD20_ROW_SIZE - 1);
- len &= ~(SAMD20_ROW_SIZE - 1);
-
- while (len) {
- /* Write address of first word in row to erase it */
- /* Must be shifted right for 16-bit address, see Datasheet §20.8.8 Address */
- adiv5_ap_mem_write(ap, SAMD20_NVMC_ADDRESS, addr >> 1);
-
- /* Unlock */
- samd20_unlock_current_address(target);
-
- /* Issue the erase command */
- adiv5_ap_mem_write(ap, SAMD20_NVMC_CMD, SAMD20_CMD_KEY | SAMD20_CMD_ERASEROW);
- /* Poll for NVM Ready */
- while ((adiv5_ap_mem_read(ap, SAMD20_NVMC_INTFLAG) & SAMD20_NVMC_READY) == 0)
- if(target_check_error(target))
- return -1;
-
- /* Lock */
- samd20_lock_current_address(target);
-
- addr += SAMD20_ROW_SIZE;
- len -= SAMD20_ROW_SIZE;
- }
-
- return 0;
-}
-
-/**
- * Write flash page by page
- */
-static int samd20_flash_write(struct target_s *target, uint32_t dest,
- const uint8_t *src, int len)
-{
- ADIv5_AP_t *ap = adiv5_target_ap(target);
-
- /* Find the size of our 32-bit data buffer */
- uint32_t offset = dest % 4;
- uint32_t words = (offset + len + 3) / 4;
- uint32_t data[words], i = 0;
-
- /* Populate the data buffer */
- memset((uint8_t *)data, 0xFF, words * 4);
- memcpy((uint8_t *)data + offset, src, len);
-
- /* The address of the first word involved in the write */
- uint32_t addr = dest & ~0x3;
- /* The address of the last word involved in the write */
- uint32_t end = (dest + len - 1) & ~0x3;
-
- /* The start address of the first page involved in the write */
- uint32_t first_page = dest & ~(SAMD20_PAGE_SIZE - 1);
- /* The start address of the last page involved in the write */
- uint32_t last_page = (dest + len - 1) & ~(SAMD20_PAGE_SIZE - 1);
- uint32_t end_of_this_page;
-
-
- for (uint32_t page = first_page; page <= last_page; page += SAMD20_PAGE_SIZE) {
- end_of_this_page = page + (SAMD20_PAGE_SIZE - 4);
-
- if (addr > page || (page == last_page && end < end_of_this_page)) {
- /* Setup write */
- adiv5_ap_write(ap, ADIV5_AP_CSW, ap->csw |
- ADIV5_AP_CSW_SIZE_WORD | ADIV5_AP_CSW_ADDRINC_SINGLE);
- adiv5_ap_write(ap, ADIV5_AP_TAR, addr);
- adiv5_dp_write(ap->dp, ADIV5_DP_SELECT,
- ((uint32_t)ap->apsel << 24)|(ADIV5_AP_DRW & 0xF0));
-
- /* Partial, manual page write */
- for (; addr <= MINIMUM(end, end_of_this_page); addr += 4, i++) {
- adiv5_dp_write_ap(ap->dp, ADIV5_AP_DRW, data[i]);
- }
-
- /* Unlock */
- samd20_unlock_current_address(target);
-
- /* Issue the write page command */
- adiv5_ap_mem_write(ap, SAMD20_NVMC_CMD,
- SAMD20_CMD_KEY | SAMD20_CMD_WRITEPAGE);
- } else {
- /* Write first word to set address */
- adiv5_ap_mem_write(ap, addr, data[i]); addr += 4; i++;
-
- /* Unlock */
- samd20_unlock_current_address(target);
-
- /* Set up write */
- adiv5_ap_write(ap, ADIV5_AP_CSW, ap->csw |
- ADIV5_AP_CSW_SIZE_WORD | ADIV5_AP_CSW_ADDRINC_SINGLE);
- adiv5_ap_write(ap, ADIV5_AP_TAR, addr);
- adiv5_dp_write(ap->dp, ADIV5_DP_SELECT,
- ((uint32_t)ap->apsel << 24)|(ADIV5_AP_DRW & 0xF0));
-
- /* Full, automatic page write */
- for (; addr < page + SAMD20_PAGE_SIZE; addr += 4, i++) {
- adiv5_dp_write_ap(ap->dp, ADIV5_AP_DRW, data[i]);
- }
- }
-
- /* Poll for NVM Ready */
- while ((adiv5_ap_mem_read(ap, SAMD20_NVMC_INTFLAG) & SAMD20_NVMC_READY) == 0)
- if(target_check_error(target))
- return -1;
-
- /* Lock */
- samd20_lock_current_address(target);
- }
-
- return 0;
-}
-
-/**
- * Uses the Device Service Unit to erase the entire flash
- */
-static bool samd20_cmd_erase_all(target *t)
-{
- ADIv5_AP_t *ap = adiv5_target_ap(t);
-
- /* Erase all */
- adiv5_ap_mem_write(ap, SAMD20_DSU_CTRLSTAT, SAMD20_CTRL_CHIP_ERASE);
-
- /* Poll for DSU Ready */
- while ((adiv5_ap_mem_read(ap, SAMD20_DSU_CTRLSTAT) & SAMD20_STATUSA_DONE) == 0)
- if(target_check_error(t))
- return false;
-
- return true;
-}
-
-/**
- * Sets the NVM region lock bits in the User Row. This value is read
- * at startup as the default value for the lock bits, and hence does
- * not take effect until a reset.
- *
- * 0x0000 = Lock, 0xFFFF = Unlock (default)
- */
-static bool samd20_set_flashlock(target *t, uint16_t value)
-{
- ADIv5_AP_t *ap = adiv5_target_ap(t);
-
- uint32_t high = adiv5_ap_mem_read(ap, SAMD20_NVM_USER_ROW_HIGH);
- uint32_t low = adiv5_ap_mem_read(ap, SAMD20_NVM_USER_ROW_LOW);
-
- /* Write address of a word in the row to erase it */
- /* Must be shifted right for 16-bit address, see Datasheet §20.8.8 Address */
- adiv5_ap_mem_write(ap, SAMD20_NVMC_ADDRESS, SAMD20_NVM_USER_ROW_LOW >> 1);
-
- /* Issue the erase command */
- adiv5_ap_mem_write(ap, SAMD20_NVMC_CMD, SAMD20_CMD_KEY | SAMD20_CMD_ERASEAUXROW);
-
- /* Poll for NVM Ready */
- while ((adiv5_ap_mem_read(ap, SAMD20_NVMC_INTFLAG) & SAMD20_NVMC_READY) == 0)
- if(target_check_error(t))
- return -1;
-
- /* Modify the high byte of the user row */
- high = (high & 0x0000FFFF) | ((value << 16) & 0xFFFF0000);
-
- /* Write back */
- adiv5_ap_mem_write(ap, SAMD20_NVM_USER_ROW_LOW, low);
- adiv5_ap_mem_write(ap, SAMD20_NVM_USER_ROW_HIGH, high);
-
- /* Issue the page write command */
- adiv5_ap_mem_write(ap, SAMD20_NVMC_CMD,
- SAMD20_CMD_KEY | SAMD20_CMD_WRITEAUXPAGE);
-
- return true;
-}
-static bool samd20_cmd_lock_flash(target *t)
-{
- return samd20_set_flashlock(t, 0x0000);
-}
-static bool samd20_cmd_unlock_flash(target *t)
-{
- return samd20_set_flashlock(t, 0xFFFF);
-}
-static bool samd20_cmd_read_userrow(target *t)
-{
- ADIv5_AP_t *ap = adiv5_target_ap(t);
-
- gdb_outf("User Row: 0x%08x%08x\n",
- adiv5_ap_mem_read(ap, SAMD20_NVM_USER_ROW_HIGH),
- adiv5_ap_mem_read(ap, SAMD20_NVM_USER_ROW_LOW));
-
- return true;
-}
-/**
- * Reads the 128-bit serial number from the NVM
- */
-static bool samd20_cmd_serial(target *t)
-{
- ADIv5_AP_t *ap = adiv5_target_ap(t);
-
- gdb_outf("Serial Number: 0x");
-
- for (uint32_t i = 0; i < 4; i++) {
- gdb_outf("%08x", adiv5_ap_mem_read(ap, SAMD20_NVM_SERIAL(i)));
- }
-
- gdb_outf("\n");
-
- return true;
-}
-/**
- * Returns the size (in bytes) of the current SAM D20's flash memory.
- */
-static uint32_t samd20_flash_size(target *t)
-{
- ADIv5_AP_t *ap = adiv5_target_ap(t);
-
- /* Read the Device ID */
- uint32_t did = adiv5_ap_mem_read(ap, SAMD20_DSU_DID);
-
- /* Mask off the device select bits */
- uint8_t devsel = did & SAMD20_DID_DEVSEL_MASK;
-
- /* Shift the maximum flash size (256KB) down as appropriate */
- return (0x40000 >> (devsel % 5));
-}
-/**
- * Runs the Memory Built In Self Test (MBIST)
- */
-static bool samd20_cmd_mbist(target *t)
-{
- ADIv5_AP_t *ap = adiv5_target_ap(t);
-
- /* Write the memory parameters to the DSU */
- adiv5_ap_mem_write(ap, SAMD20_DSU_ADDRESS, 0);
- adiv5_ap_mem_write(ap, SAMD20_DSU_LENGTH, samd20_flash_size(t));
-
- /* Clear the fail bit */
- adiv5_ap_mem_write(ap, SAMD20_DSU_CTRLSTAT, SAMD20_STATUSA_FAIL);
-
- /* Write the MBIST command */
- adiv5_ap_mem_write(ap, SAMD20_DSU_CTRLSTAT, SAMD20_CTRL_MBIST);
-
- /* Poll for DSU Ready */
- uint32_t status;
- while (((status = adiv5_ap_mem_read(ap, SAMD20_DSU_CTRLSTAT)) &
- (SAMD20_STATUSA_DONE | SAMD20_STATUSA_PERR | SAMD20_STATUSA_FAIL)) == 0)
- if(target_check_error(t))
- return false;
-
- /* Test the protection error bit in Status A */
- if (status & SAMD20_STATUSA_PERR) {
- gdb_outf("MBIST not run due to protection error.\n");
- return true;
- }
-
- /* Test the fail bit in Status A */
- if (status & SAMD20_STATUSA_FAIL) {
- gdb_outf("MBIST Fail @ 0x%08x\n",
- adiv5_ap_mem_read(ap, SAMD20_DSU_ADDRESS));
- } else {
- gdb_outf("MBIST Passed!\n");
- }
-
- return true;
-}