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-rw-r--r--platforms/arm_atsam/eeprom.c184
1 files changed, 184 insertions, 0 deletions
diff --git a/platforms/arm_atsam/eeprom.c b/platforms/arm_atsam/eeprom.c
new file mode 100644
index 0000000000..ff1a692623
--- /dev/null
+++ b/platforms/arm_atsam/eeprom.c
@@ -0,0 +1,184 @@
+/* Copyright 2017 Fred Sundvik
+ *
+ * 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/>.
+ */
+#include "eeprom.h"
+#include "debug.h"
+#include "samd51j18a.h"
+#include "core_cm4.h"
+#include "component/nvmctrl.h"
+
+#ifndef EEPROM_SIZE
+# include "eeconfig.h"
+# define EEPROM_SIZE (((EECONFIG_SIZE + 3) / 4) * 4) // based off eeconfig's current usage, aligned to 4-byte sizes, to deal with LTO
+#endif
+
+#ifndef MAX
+# define MAX(X, Y) ((X) > (Y) ? (X) : (Y))
+#endif
+
+#ifndef BUSY_RETRIES
+# define BUSY_RETRIES 10000
+#endif
+
+// #define DEBUG_EEPROM_OUTPUT
+
+/*
+ * Debug print utils
+ */
+#if defined(DEBUG_EEPROM_OUTPUT)
+# define eeprom_printf(fmt, ...) xprintf(fmt, ##__VA_ARGS__);
+#else /* NO_DEBUG */
+# define eeprom_printf(fmt, ...)
+#endif /* NO_DEBUG */
+
+__attribute__((aligned(4))) static uint8_t buffer[EEPROM_SIZE] = {0};
+volatile uint8_t * SmartEEPROM8 = (uint8_t *)SEEPROM_ADDR;
+
+static inline bool eeprom_is_busy(void) {
+ int timeout = BUSY_RETRIES;
+ while (NVMCTRL->SEESTAT.bit.BUSY && timeout-- > 0)
+ ;
+
+ return NVMCTRL->SEESTAT.bit.BUSY;
+}
+
+static uint32_t get_virtual_eeprom_size(void) {
+ // clang-format off
+ static const uint32_t VIRTUAL_EEPROM_MAP[11][8] = {
+ /* 4 8 16 32 64 128 256 512 */
+ /* 0*/ { 0, 0, 0, 0, 0, 0, 0, 0 },
+ /* 1*/ { 512, 1024, 2048, 4096, 4096, 4096, 4096, 4096 },
+ /* 2*/ { 512, 1024, 2048, 4096, 8192, 8192, 8192, 8192 },
+ /* 3*/ { 512, 1024, 2048, 4096, 8192, 16384, 16384, 16384 },
+ /* 4*/ { 512, 1024, 2048, 4096, 8192, 16384, 16384, 16384 },
+ /* 5*/ { 512, 1024, 2048, 4096, 8192, 16384, 32768, 32768 },
+ /* 6*/ { 512, 1024, 2048, 4096, 8192, 16384, 32768, 32768 },
+ /* 7*/ { 512, 1024, 2048, 4096, 8192, 16384, 32768, 32768 },
+ /* 8*/ { 512, 1024, 2048, 4096, 8192, 16384, 32768, 32768 },
+ /* 9*/ { 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536 },
+ /*10*/ { 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536 },
+ };
+ // clang-format on
+
+ static uint32_t virtual_eeprom_size = UINT32_MAX;
+ if (virtual_eeprom_size == UINT32_MAX) {
+ virtual_eeprom_size = VIRTUAL_EEPROM_MAP[NVMCTRL->SEESTAT.bit.PSZ][NVMCTRL->SEESTAT.bit.SBLK];
+ }
+ // eeprom_printf("get_virtual_eeprom_size:: %d:%d:%d\n", NVMCTRL->SEESTAT.bit.PSZ, NVMCTRL->SEESTAT.bit.SBLK, virtual_eeprom_size);
+ return virtual_eeprom_size;
+}
+
+uint8_t eeprom_read_byte(const uint8_t *addr) {
+ uintptr_t offset = (uintptr_t)addr;
+ if (offset >= MAX(EEPROM_SIZE, get_virtual_eeprom_size())) {
+ eeprom_printf("eeprom_read_byte:: out of bounds\n");
+ return 0x0;
+ }
+
+ if (get_virtual_eeprom_size() == 0) {
+ return buffer[offset];
+ }
+
+ if (eeprom_is_busy()) {
+ eeprom_printf("eeprom_write_byte:: timeout\n");
+ return 0x0;
+ }
+
+ return SmartEEPROM8[offset];
+}
+
+void eeprom_write_byte(uint8_t *addr, uint8_t value) {
+ uintptr_t offset = (uintptr_t)addr;
+ if (offset >= MAX(EEPROM_SIZE, get_virtual_eeprom_size())) {
+ eeprom_printf("eeprom_write_byte:: out of bounds\n");
+ return;
+ }
+
+ if (get_virtual_eeprom_size() == 0) {
+ buffer[offset] = value;
+ return;
+ }
+
+ if (eeprom_is_busy()) {
+ eeprom_printf("eeprom_write_byte:: timeout\n");
+ return;
+ }
+
+ SmartEEPROM8[offset] = value;
+}
+
+uint16_t eeprom_read_word(const uint16_t *addr) {
+ const uint8_t *p = (const uint8_t *)addr;
+ return eeprom_read_byte(p) | (eeprom_read_byte(p + 1) << 8);
+}
+
+uint32_t eeprom_read_dword(const uint32_t *addr) {
+ const uint8_t *p = (const uint8_t *)addr;
+ return eeprom_read_byte(p) | (eeprom_read_byte(p + 1) << 8) | (eeprom_read_byte(p + 2) << 16) | (eeprom_read_byte(p + 3) << 24);
+}
+
+void eeprom_read_block(void *buf, const void *addr, size_t len) {
+ const uint8_t *p = (const uint8_t *)addr;
+ uint8_t * dest = (uint8_t *)buf;
+ while (len--) {
+ *dest++ = eeprom_read_byte(p++);
+ }
+}
+
+void eeprom_write_word(uint16_t *addr, uint16_t value) {
+ uint8_t *p = (uint8_t *)addr;
+ eeprom_write_byte(p++, value);
+ eeprom_write_byte(p, value >> 8);
+}
+
+void eeprom_write_dword(uint32_t *addr, uint32_t value) {
+ uint8_t *p = (uint8_t *)addr;
+ eeprom_write_byte(p++, value);
+ eeprom_write_byte(p++, value >> 8);
+ eeprom_write_byte(p++, value >> 16);
+ eeprom_write_byte(p, value >> 24);
+}
+
+void eeprom_write_block(const void *buf, void *addr, size_t len) {
+ uint8_t * p = (uint8_t *)addr;
+ const uint8_t *src = (const uint8_t *)buf;
+ while (len--) {
+ eeprom_write_byte(p++, *src++);
+ }
+}
+
+void eeprom_update_byte(uint8_t *addr, uint8_t value) { eeprom_write_byte(addr, value); }
+
+void eeprom_update_word(uint16_t *addr, uint16_t value) {
+ uint8_t *p = (uint8_t *)addr;
+ eeprom_write_byte(p++, value);
+ eeprom_write_byte(p, value >> 8);
+}
+
+void eeprom_update_dword(uint32_t *addr, uint32_t value) {
+ uint8_t *p = (uint8_t *)addr;
+ eeprom_write_byte(p++, value);
+ eeprom_write_byte(p++, value >> 8);
+ eeprom_write_byte(p++, value >> 16);
+ eeprom_write_byte(p, value >> 24);
+}
+
+void eeprom_update_block(const void *buf, void *addr, size_t len) {
+ uint8_t * p = (uint8_t *)addr;
+ const uint8_t *src = (const uint8_t *)buf;
+ while (len--) {
+ eeprom_write_byte(p++, *src++);
+ }
+}