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rp2040: support usb_request_bootloader 

Signed-off-by: Lasse Dalegaard <dalegaard@gmail.com>
Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Lasse Dalegaard 2021-07-03 12:49:33 +02:00 committed by Kevin O'Connor
parent bb2f27f928
commit 0597210cb9
4 changed files with 30 additions and 2 deletions
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2
src/rp2040/Makefile
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@ -15,7 +15,7 @@ $(OUT)klipper.elf: $(OUT)stage2.o $(OUT)src/rp2040/rp2040_link.ld
# Add source files
src-y += rp2040/main.c rp2040/gpio.c rp2040/adc.c generic/crc16_ccitt.c
src-y += generic/armcm_boot.c generic/armcm_irq.c generic/armcm_reset.c
src-y += generic/timer_irq.c rp2040/timer.c
src-y += generic/timer_irq.c rp2040/timer.c rp2040/bootrom.c
src-$(CONFIG_USBSERIAL) += rp2040/usbserial.c generic/usb_cdc.c
src-$(CONFIG_SERIAL) += rp2040/serial.c generic/serial_irq.c

25
src/rp2040/bootrom.c Normal file
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@ -0,0 +1,25 @@
// Hardware interface to bootrom on rp2040
//
// Copyright (C) 2021 Lasse Dalegaard <dalegaard@gmail.com>
//
// This file may be distributed under the terms of the GNU GPLv3 license.
#include <stdint.h> // uint16_t, uint32_t, uintptr_t
static void *
rom_func_lookup(uint32_t code)
{
// Table and lookup function are provided by the BOOTROM
void *(*fn)(uint16_t *, uint32_t) =
(void *)(uintptr_t)(*(uint16_t *)0x18);
uint16_t *table = (uint16_t *)(uintptr_t)(*(uint16_t *)0x14);
return fn(table, code);
}
void
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);
}

2
src/rp2040/internal.h
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@ -8,5 +8,7 @@ void enable_pclock(uint32_t reset_bit);
int is_enabled_pclock(uint32_t reset_bit);
uint32_t get_pclock_frequency(uint32_t reset_bit);
void gpio_peripheral(uint32_t gpio, int func, int pull_up);
void reset_to_usb_boot(uint32_t gpio_activity_pin_mask
, uint32_t disable_interface_mask);
#endif // internal.h

3
src/rp2040/usbserial.c
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@ -153,7 +153,8 @@ usb_set_configure(void)
void
usb_request_bootloader(void)
{
// XXX
// Use the bootrom-provided code to reset into BOOTSEL mode
reset_to_usb_boot(0, 0);
}