Add customisable EEPROM driver selection (#7274)

- uprintf -> dprintf
- Fix atsam "vendor" eeprom.
- Bump Kinetis K20x to 64 bytes, too.
- Rollback Kinetis to 32 bytes as partitioning can only be done once. Add warning about changing the value.
- Change RAM-backed "fake" EEPROM implementations to match eeconfig's current usage.
- Add 24LC128 by request.

2 files changed, 22 insertions, 9 deletions

diff --git a/tmk_core/common/chibios/eeprom_stm32.c b/tmk_core/common/chibios/eeprom_stm32.c
index 926b581c6b..ea51989728 100644
--- a/tmk_core/common/chibios/eeprom_stm32.c
+++ b/tmk_core/common/chibios/eeprom_stm32.c
@@ -173,7 +173,7 @@ void eeprom_update_dword(uint32_t *Address, uint32_t Value) {
     }
 }
 
-void eeprom_read_block(void *buf, const void *addr, uint32_t len) {
+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--) {
@@ -181,7 +181,7 @@ void eeprom_read_block(void *buf, const void *addr, uint32_t len) {
     }
 }
 
-void eeprom_write_block(const void *buf, void *addr, uint32_t len) {
+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--) {
@@ -189,7 +189,7 @@ void eeprom_write_block(const void *buf, void *addr, uint32_t len) {
     }
 }
 
-void eeprom_update_block(const void *buf, void *addr, uint32_t len) {
+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--) {
diff --git a/tmk_core/common/chibios/eeprom_teensy.c b/tmk_core/common/chibios/eeprom_teensy.c
index a4093fb3ba..0fab9f73d6 100644
--- a/tmk_core/common/chibios/eeprom_teensy.c
+++ b/tmk_core/common/chibios/eeprom_teensy.c
@@ -50,7 +50,17 @@
 // (aligned to 2 or 4 byte boundaries) has twice the endurance
 // compared to writing 8 bit bytes.
 //
-#    define EEPROM_SIZE 32
+#    ifndef EEPROM_SIZE
+#        define EEPROM_SIZE 32
+#    endif
+
+/*
+    ^^^ Here be dragons:
+        NXP AppNote AN4282 section 3.1 states that partitioning must only be done once.
+        Once EEPROM partitioning is done, the size is locked to this initial configuration.
+        Attempts to modify the EEPROM_SIZE setting may brick your board.
+*/
+
 
 // Writing unaligned 16 or 32 bit data is handled automatically when
 // this is defined, but at a cost of extra code size.  Without this,
@@ -517,8 +527,11 @@ void eeprom_write_block(const void *buf, void *addr, uint32_t len) {
 #else
 // No EEPROM supported, so emulate it
 
-#    define EEPROM_SIZE 32
-static uint8_t buffer[EEPROM_SIZE];
+#    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
+__attribute__((aligned(4))) static uint8_t buffer[EEPROM_SIZE];
 
 uint8_t eeprom_read_byte(const uint8_t *addr) {
     uint32_t offset = (uint32_t)addr;
@@ -540,7 +553,7 @@ uint32_t eeprom_read_dword(const uint32_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, uint32_t len) {
+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--) {
@@ -562,7 +575,7 @@ void eeprom_write_dword(uint32_t *addr, uint32_t value) {
     eeprom_write_byte(p, value >> 24);
 }
 
-void eeprom_write_block(const void *buf, void *addr, uint32_t len) {
+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--) {
@@ -589,7 +602,7 @@ void eeprom_update_dword(uint32_t *addr, uint32_t value) {
     eeprom_write_byte(p, value >> 24);
 }
 
-void eeprom_update_block(const void *buf, void *addr, uint32_t len) {
+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--) {