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drivers: Support special QSPI direct-read protocol.

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This is useful for interfaces that stay in memory-mapped mode by default.
They can implement this method with a simple `memcpy()`.

Signed-off-by: Damien George <damien@micropython.org>
This commit is contained in:
Damien George
2025-05-01 01:19:52 +10:00
parent eaffbacb10
commit 62a674c9c4
2 changed files with 9 additions and 0 deletions
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1
drivers/bus/qspi.h
View File

@@ -46,6 +46,7 @@ typedef struct _mp_qspi_proto_t {
int (*write_cmd_addr_data)(void *self, uint8_t cmd, uint32_t addr, size_t len, const uint8_t *src);
int (*read_cmd)(void *self, uint8_t cmd, size_t len, uint32_t *dest);
int (*read_cmd_qaddr_qdata)(void *self, uint8_t cmd, uint32_t addr, uint8_t num_dummy, size_t len, uint8_t *dest);
int (*direct_read)(void *self, uint32_t addr, size_t len, uint8_t *dest); // can be NULL if direct read not supported
} mp_qspi_proto_t;
typedef struct _mp_soft_qspi_obj_t {

8
drivers/memory/spiflash.c
View File

@@ -197,6 +197,10 @@ void mp_spiflash_init(mp_spiflash_t *self) {
} else {
uint8_t num_dummy = MICROPY_HW_SPIFLASH_QREAD_NUM_DUMMY(self);
self->config->bus.u_qspi.proto->ioctl(self->config->bus.u_qspi.data, MP_QSPI_IOCTL_INIT, num_dummy);
if (self->config->bus.u_qspi.proto->direct_read != NULL) {
// A bus with a custom read function should not have any further initialisation done.
return;
}
}
mp_spiflash_acquire_bus(self);
@@ -318,6 +322,10 @@ int mp_spiflash_read(mp_spiflash_t *self, uint32_t addr, size_t len, uint8_t *de
if (len == 0) {
return 0;
}
const mp_spiflash_config_t *c = self->config;
if (c->bus_kind == MP_SPIFLASH_BUS_QSPI && c->bus.u_qspi.proto->direct_read != NULL) {
return c->bus.u_qspi.proto->direct_read(c->bus.u_qspi.data, addr, len, dest);
}
mp_spiflash_acquire_bus(self);
int ret = mp_spiflash_read_data(self, addr, len, dest);
mp_spiflash_release_bus(self);