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rp2/rp2_flash: Add MICROPY_HW_FLASH_MAX_FREQ. #17389

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rp2/rp2_flash: Add MICROPY_HW_FLASH_MAX_FREQ. #17389

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13 changes: 10 additions & 3 deletions ports/rp2/rp2_flash.c
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Original file line number Diff line number Diff line change
Expand Up @@ -49,6 +49,14 @@
static_assert(MICROPY_HW_ROMFS_BYTES % 4096 == 0, "ROMFS size must be a multiple of 4K");
static_assert(MICROPY_HW_FLASH_STORAGE_BYTES % 4096 == 0, "Flash storage size must be a multiple of 4K");

#ifndef MICROPY_HW_FLASH_MAX_FREQ
// Emulate Pico SDK's SYS_CLK_HZ / PICO_FLASH_SPI_CLKDIV behaviour by default
// On RP2040 if PICO_USE_FASTEST_SUPPORTED_CLOCK is set then SYS_CLK_HZ can be
// 200MHz, potentially putting timings derived from PICO_FLASH_SPI_CLKDIV
// out of range.
#define MICROPY_HW_FLASH_MAX_FREQ (SYS_CLK_HZ / PICO_FLASH_SPI_CLKDIV)
#endif

#ifndef MICROPY_HW_FLASH_STORAGE_BASE
#define MICROPY_HW_FLASH_STORAGE_BASE (PICO_FLASH_SIZE_BYTES - MICROPY_HW_FLASH_STORAGE_BYTES)
#endif
Expand Down Expand Up @@ -104,9 +112,8 @@ static bool use_multicore_lockout(void) {
// and core1 locked out if relevant.
static void __no_inline_not_in_flash_func(rp2_flash_set_timing_internal)(int clock_hz) {

// Use the minimum divisor assuming a 133MHz flash.
const int max_flash_freq = 133000000;
int divisor = (clock_hz + max_flash_freq - 1) / max_flash_freq;
// Use the minimum divisor based upon our target MICROPY_HW_FLASH_MAX_FREQ
int divisor = (clock_hz + MICROPY_HW_FLASH_MAX_FREQ - 1) / MICROPY_HW_FLASH_MAX_FREQ;

#if PICO_RP2350
// Make sure flash is deselected - QMI doesn't appear to have a busy flag(!)
Expand Down
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