support saving into SmartEEPROM

Signed-off-by: Alexandre d Alton <alex@alexdalton.org>

tmk_core/common/arm_atsam/eeprom.c

@@ -13,21 +13,41 @@
  * 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 "samd51j18a.h"
 #include "eeprom.h"
+#include "core_cm4.h"
+#include "component/nvmctrl.h"
 
 #define EEPROM_SIZE 32
 
-static uint8_t buffer[EEPROM_SIZE];
+volatile uint8_t *SmartEEPROM8 = (uint8_t *) 0x44000000;
+uint8_t buffer[EEPROM_SIZE];
 
 uint8_t eeprom_read_byte(const uint8_t *addr) {
 	uintptr_t offset = (uintptr_t)addr;
-	return buffer[offset];
+
+	if (NVMCTRL->SEESTAT.bit.PSZ == 0 || NVMCTRL->SEESTAT.bit.SBLK == 0)
+		return buffer[offset];
+
+	int timeout = 10000;
+	while (NVMCTRL->SEESTAT.bit.BUSY && timeout-- > 0)
+		;
+	return SmartEEPROM8[offset];
 }
 
 void eeprom_write_byte(uint8_t *addr, uint8_t value) {
 	uintptr_t offset = (uintptr_t)addr;
-	buffer[offset] = value;
+
+	if (NVMCTRL->SEESTAT.bit.PSZ == 0 || NVMCTRL->SEESTAT.bit.SBLK == 0) {
+		buffer[offset] = value;
+		return;
+	}
+
+	int timeout = 10000;
+	while (NVMCTRL->SEESTAT.bit.BUSY && timeout-- > 0)
+		;
+
+	SmartEEPROM8[offset] = value;
 }
 
 uint16_t eeprom_read_word(const uint16_t *addr) {