ports/alif: Fix and enable Alif HW CRC32.

Signed-off-by: iabdalkader <i.abdalkader@gmail.com>
This commit is contained in:
iabdalkader 2025-09-26 10:19:50 +02:00
parent 7f439f56de
commit 5d659dccec

View File

@ -25,17 +25,16 @@
#include "global_map.h" #include "global_map.h"
#include "omv_crc.h" #include "omv_crc.h"
// There seems to be a mismatch between how the Alif HW CRC32 algorithm
// works and the other HW CRCs and the software implementation.
// Just leaving this here just in case it works on a different series.
#if 0
#define CRC0 ((CRC_Type *) CRC0_BASE) #define CRC0 ((CRC_Type *) CRC0_BASE)
static bool crc32_initialized = false; static bool crc32_initialized = false;
extern const uint32_t crc32_table[256];
static void crc_calculate(CRC_Type *crc, const void *buf, uint32_t len, uint32_t *value); static void crc_calculate(CRC_Type *crc, const void *buf, uint32_t len, uint32_t *value);
static void omv_crc32_init(void) { static void omv_crc32_init(void) {
CRC0->CRC_CONTROL = CRC_32C | CRC0->CRC_CONTROL = CRC_32C |
CRC_BYTE_SWAP |
CRC_CUSTOM_POLY | CRC_CUSTOM_POLY |
CRC_ALGO_32_BIT_SIZE; CRC_ALGO_32_BIT_SIZE;
CRC0->CRC_SEED = OMV_CRC32_INIT; CRC0->CRC_SEED = OMV_CRC32_INIT;
@ -75,28 +74,30 @@ uint32_t omv_crc32_update(uint32_t crc, const void *buf, size_t len) {
static void crc_calculate(CRC_Type *crc, const void *buf, uint32_t len, uint32_t *value) { static void crc_calculate(CRC_Type *crc, const void *buf, uint32_t len, uint32_t *value) {
const uint8_t *data = (const uint8_t *) buf; const uint8_t *data = (const uint8_t *) buf;
uint32_t aligned_len = len & ~3U; // Length aligned to 4 bytes
uint32_t remainder = len & 3U; // Remaining bytes
if ((len % 4) == 0) { // Process aligned part (multiple of 4 bytes) with hardware
// Use hardware only if length is multiple of 4 if (aligned_len > 0) {
crc->CRC_SEED = *value; crc->CRC_SEED = *value;
crc->CRC_CONTROL |= CRC_INIT_BIT; crc->CRC_CONTROL |= CRC_INIT_BIT;
// Hardware path - process all data as 32-bit words
const uint32_t *data32 = (const uint32_t *) data; const uint32_t *data32 = (const uint32_t *) data;
for (uint32_t i = 0; i < len / 4; i++) { for (uint32_t i = 0; i < aligned_len / 4; i++) {
crc->CRC_DATA_IN_32_0 = data32[i]; crc->CRC_DATA_IN_32_0 = data32[i];
} }
*value = crc->CRC_OUT; *value = crc->CRC_OUT;
} else { }
// Software path - use lookup table
uint32_t result = *value;
extern const uint32_t crc32_table[256];
for (uint32_t i = 0; i < len; i++) { // Process remaining bytes using software CRC with lookup table
uint8_t index = (result >> 24) ^ data[i]; if (remainder > 0) {
uint32_t result = *value;
const uint8_t *remaining_data = data + aligned_len;
for (uint32_t i = 0; i < remainder; i++) {
uint8_t index = (result >> 24) ^ remaining_data[i];
result = (result << 8) ^ crc32_table[index]; result = (result << 8) ^ crc32_table[index];
} }
*value = result; *value = result;
} }
} }
#endif