entropy: entropy_litex: Use LiteX HAL

Use `litex_read` instead of separate implementation in driver.

Signed-off-by: Michal Sieron <[email protected]>

Author: michalsieron

drivers/entropy/entropy_litex.c

@@ -14,24 +14,8 @@
 #include <string.h>
 #include <zephyr.h>
 
-#define PRBS_STATUS     ((volatile uint32_t *)DT_INST_REG_ADDR(0))
+#define PRBS_STATUS     DT_INST_REG_ADDR(0)
 #define PRBS_WIDTH      DT_INST_REG_SIZE(0)
-#define SUBREG_SIZE_BIT 8
-
-static inline unsigned int prbs_read(volatile uint32_t *reg_status,
-					 volatile uint32_t reg_width)
-{
-	uint32_t shifted_data, shift, i;
-	uint32_t result = 0;
-
-	for (i = 0; i < reg_width; ++i) {
-		shifted_data = *(reg_status + i);
-		shift = (reg_width - i - 1) * SUBREG_SIZE_BIT;
-		result |= (shifted_data << shift);
-	}
-
-	return result;
-}
 
 static int entropy_prbs_get_entropy(const struct device *dev, uint8_t *buffer,
 					 uint16_t length)
@@ -40,7 +24,7 @@ static int entropy_prbs_get_entropy(const struct device *dev, uint8_t *buffer,
 		size_t to_copy;
 		uint32_t value;
 
-		value = prbs_read(PRBS_STATUS, PRBS_WIDTH);
+		value = litex_read(PRBS_STATUS, PRBS_WIDTH);
 		to_copy = MIN(length, sizeof(value));
 
 		memcpy(buffer, &value, to_copy);