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drivers: flash: Added buffered write for addresses in flash on rp2040 

It is impossible to perform flash reads during a flash write. When the
data to write to flash lies in the flash itself, it is buffered in ram
before writing.

Signed-off-by: Lukas Gehreke <lk.gehreke@gmail.com>
This commit is contained in:
Lukas Gehreke 2024-02-13 17:17:18 +01:00 committed by Mahesh Mahadevan
parent 69e0b03ca9
commit 5f6a68a03b
1 changed files with 9 additions and 5 deletions
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14
drivers/flash/flash_rpi_pico.c
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@ -61,6 +61,7 @@ enum outover {
static ssi_hw_t *const ssi = (ssi_hw_t *)SSI_BASE_ADDRESS;
static uint32_t boot2_copyout[BOOT2_SIZE_WORDS];
static bool boot2_copyout_valid;
static uint8_t flash_ram_buffer[PAGE_SIZE];
static void __no_inline_not_in_flash_func(flash_init_boot2_copyout)(void)
{
@ -223,22 +224,25 @@ static int flash_rpi_write(const struct device *dev, off_t offset, const void *d
if ((offset & (PAGE_SIZE - 1)) > 0) {
bytes_to_write = MIN(PAGE_SIZE - (offset & (PAGE_SIZE - 1)), size);
flash_write_partial(offset, data_pointer, bytes_to_write);
memcpy(flash_ram_buffer, data_pointer, bytes_to_write);
flash_write_partial(offset, flash_ram_buffer, bytes_to_write);
data_pointer += bytes_to_write;
size -= bytes_to_write;
offset += bytes_to_write;
}
if (size >= PAGE_SIZE) {
bytes_to_write = size & ~(PAGE_SIZE - 1);
flash_range_program(offset, data_pointer, bytes_to_write);
while (size >= PAGE_SIZE) {
bytes_to_write = PAGE_SIZE;
memcpy(flash_ram_buffer, data_pointer, bytes_to_write);
flash_range_program(offset, flash_ram_buffer, bytes_to_write);
data_pointer += bytes_to_write;
size -= bytes_to_write;
offset += bytes_to_write;
}
if (size > 0) {
flash_write_partial(offset, data_pointer, size);
memcpy(flash_ram_buffer, data_pointer, size);
flash_write_partial(offset, flash_ram_buffer, size);
}
irq_unlock(key);