Refactor `bootloader_jump()` implementations (#15450)

* Refactor `bootloader_jump()` implementations

* Fix tests?

* Rename `atmel-samba` to `md-boot`

1 files changed, 66 insertions, 0 deletions

diff --git a/platforms/arm_atsam/bootloaders/md_boot.c b/platforms/arm_atsam/bootloaders/md_boot.c
new file mode 100644
index 0000000000..fe07389487
--- /dev/null
+++ b/platforms/arm_atsam/bootloaders/md_boot.c
@@ -0,0 +1,66 @@
+/* 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 "bootloader.h"
+
+#include "samd51j18a.h"
+
+#ifdef KEYBOARD_massdrop_ctrl
+// WARNING: These are only for CTRL bootloader release "v2.18Jun 22 2018 17:28:08" for bootloader_jump support
+extern uint32_t _eram;
+
+#define BOOTLOADER_MAGIC 0x3B9ACA00
+#define MAGIC_ADDR (uint32_t *)((intptr_t)(&_eram) - 4)
+
+// CTRL keyboards released with bootloader version below must use RAM method. Otherwise use WDT method.
+void bootloader_jump(void) {
+    uint8_t  ver_ram_method[] = "v2.18Jun 22 2018 17:28:08";  // The version to match (NULL terminated by compiler)
+    uint8_t *ver_check        = ver_ram_method;               // Pointer to version match string for traversal
+    uint8_t *ver_rom          = (uint8_t *)0x21A0;            // Pointer to address in ROM where this specific bootloader version would exist
+
+    while (*ver_check && *ver_rom == *ver_check) {  // While there are check version characters to match and bootloader's version matches check's version
+        ver_check++;                                // Move check version pointer to next character
+        ver_rom++;                                  // Move ROM version pointer to next character
+    }
+
+    if (!*ver_check) {                   // If check version pointer is NULL, all characters have matched
+        *MAGIC_ADDR = BOOTLOADER_MAGIC;  // Set magic number into RAM
+        NVIC_SystemReset();              // Perform system reset
+
+        while (1);  // Won't get here
+    }
+}
+
+#else
+
+// Set watchdog timer to reset. Directs the bootloader to stay in programming mode.
+void bootloader_jump(void) {
+    WDT->CTRLA.bit.ENABLE = 0;
+
+    while (WDT->SYNCBUSY.bit.ENABLE);
+    while (WDT->CTRLA.bit.ENABLE);
+
+    WDT->CONFIG.bit.WINDOW   = 0;
+    WDT->CONFIG.bit.PER      = 0;
+    WDT->EWCTRL.bit.EWOFFSET = 0;
+    WDT->CTRLA.bit.ENABLE    = 1;
+
+    while (WDT->SYNCBUSY.bit.ENABLE);
+    while (!WDT->CTRLA.bit.ENABLE);
+
+    while (1);  // Wait on timeout
+}
+#endif