sravan/system76-embedded-controller
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

scratch rom functionality (WIP)

Browse Source
This commit is contained in:
Jeremy Soller 2019-11-16 20:19:46 -07:00
parent d940e2add9
commit f52af3ff87
No known key found for this signature in database
GPG Key ID: E988B49EE78A7FB1
2 changed files with 81 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
src/board/system76/galp3-c/include/board/scratch.h Normal file
View File

@ -0,0 +1,6 @@
#ifndef _BOARD_SCRATCH_H
#define _BOARD_SCRATCH_H
void scratch_trampoline(void);
#endif // _BOARD_SCRATCH_H

75
src/board/system76/galp3-c/scratch.c Normal file
View File

@ -0,0 +1,75 @@
#include <stdbool.h>
#include <stdint.h>
volatile uint8_t __xdata __at(0x103B) ECINDAR0;
volatile uint8_t __xdata __at(0x103C) ECINDAR1;
volatile uint8_t __xdata __at(0x103D) ECINDAR2;
volatile uint8_t __xdata __at(0x103E) ECINDAR3;
volatile uint8_t __xdata __at(0x103F) ECINDDR;
volatile uint8_t __xdata __at(0x1040) SCAR0L;
volatile uint8_t __xdata __at(0x1041) SCAR0M;
volatile uint8_t __xdata __at(0x1042) SCAR0H;
volatile uint8_t __xdata __at(0x1043) SCAR1L;
volatile uint8_t __xdata __at(0x1044) SCAR1M;
volatile uint8_t __xdata __at(0x1045) SCAR1H;
// Create new segment located at 0x1000
static void scratch_start(void) __naked
{
__asm
.area SCRATCH (ABS,CODE)
__endasm;
__asm
.org 0x1000
__endasm;
}
#define FLASH_SPI 0x00000000
#define FLASH_EMBEDDED 0x40000000
static int flash_transaction(uint32_t offset, uint8_t * data, int length, bool read) {
int i;
for (i = 0; i < length; i++, offset++) {
ECINDAR3 = (uint8_t)(offset >> 24);
ECINDAR2 = (uint8_t)(offset >> 16);
ECINDAR1 = (uint8_t)(offset >> 8);
ECINDAR0 = (uint8_t)(offset);
if (read) {
data[i] = ECINDDR;
} else {
ECINDDR = data[i];
}
}
return i;
}
// Main program while running in scratch ROM
static void scratch_main(void) {
// TODO: implement flashing protocol and prevent access to flash
// data (i.e. calling functions in CSEG) during this process
for (;;) {}
}
// Finish segment located at 0x1000
static void scratch_end(void) __naked
{
__asm
.area CSEG (REL,CODE)
__endasm;
}
// Enter scratch ROM
void scratch_trampoline(void) {
// Uses SCAR1 which is mapped at 0x0800 in data space and is 1024 bytes in
// size. SCAR0 cannot be used due to __pdata overwriting it.
// Set flag to use DMA on next write
SCAR1H = 0x80;
// Set mapping at 0x1000
SCAR1L = 0x00;
SCAR1M = 0x10;
// Set DMA and enable code space mapping
SCAR1H = 0x00;
scratch_main();
}