h3n3/klipper
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

rp2040: add chipid support

Browse Source 
The rp2040 doesn't have a chip ID, but the flash chip connected does. We
can get this ID by asking the flash chip directly, but doing so requires
disengaging the XIP layer, performing the interrogation of the flash
chip, and then re-enabling the XIP layer. This gives us a 64-bit unique
ID that we can use as our USB serial number.

Signed-off-by: Lasse Dalegaard <dalegaard@gmail.com>
This commit is contained in:
Lasse Dalegaard
2021-07-04 10:24:29 +02:00
committed by Kevin O'Connor
parent 0597210cb9
commit ba958468b7
5 changed files with 171 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

38
src/rp2040/bootrom.c
View File

@@ -5,8 +5,17 @@
// This file may be distributed under the terms of the GNU GPLv3 license.
#include <stdint.h> // uint16_t, uint32_t, uintptr_t
#include <string.h> // memcpy
#include "compiler.h" // noinline, __section
static void *
#define ROM_TABLE_CODE(c1, c2) ((c1) | ((c2) << 8))
// All functions in here need to be RAM-resident, as we may need
// to (especially for the flash functions) call while the XIP layer
// is unavailable.
#define noinline_ram noinline __section(".ramfunc.read_chip_id")
static void * noinline_ram
rom_func_lookup(uint32_t code)
{
// Table and lookup function are provided by the BOOTROM
@@ -16,10 +25,31 @@ rom_func_lookup(uint32_t code)
return fn(table, code);
}
void
void noinline_ram
reset_to_usb_boot(uint32_t gpio_activity_pin_mask
, uint32_t disable_interface_mask)
{
void (*reset_to_usb_boot)(uint32_t, uint32_t) = rom_func_lookup(0x4255);
reset_to_usb_boot(gpio_activity_pin_mask, disable_interface_mask);
void (*fn)(uint32_t, uint32_t) = rom_func_lookup(ROM_TABLE_CODE('U', 'B'));
fn(gpio_activity_pin_mask, disable_interface_mask);
}
void noinline_ram
connect_internal_flash(void)
{
void (*fn)(void) = rom_func_lookup(ROM_TABLE_CODE('I', 'F'));
fn();
}
void noinline_ram
flash_exit_xip(void)
{
void (*fn)(void) = rom_func_lookup(ROM_TABLE_CODE('E', 'X'));
fn();
}
void noinline_ram
flash_flush_cache(void)
{
void (*fn)(void) = rom_func_lookup(ROM_TABLE_CODE('F', 'C'));
fn();
}