#include <linux/hw_random.h>
#include <linux/completion.h>
#include <linux/io.h>
+#include <linux/bitfield.h>
#define RNGC_VER_ID 0x0000
#define RNGC_COMMAND 0x0004
#define RNGC_CTRL_AUTO_SEED 0x00000010
#define RNGC_STATUS_ERROR 0x00010000
-#define RNGC_STATUS_FIFO_LEVEL_MASK 0x00000f00
-#define RNGC_STATUS_FIFO_LEVEL_SHIFT 8
+#define RNGC_STATUS_FIFO_LEVEL_MASK GENMASK(11, 8)
#define RNGC_STATUS_SEED_DONE 0x00000020
#define RNGC_STATUS_ST_DONE 0x00000010
{
struct imx_rngc *rngc = container_of(rng, struct imx_rngc, rng);
unsigned int status;
- unsigned int level;
int retval = 0;
while (max >= sizeof(u32)) {
if (status & RNGC_STATUS_ERROR)
break;
- /* how many random numbers are in FIFO? [0-16] */
- level = (status & RNGC_STATUS_FIFO_LEVEL_MASK) >>
- RNGC_STATUS_FIFO_LEVEL_SHIFT;
-
- if (level) {
+ if (status & RNGC_STATUS_FIFO_LEVEL_MASK) {
/* retrieve a random number from FIFO */
*(u32 *)data = readl(rngc->base + RNGC_FIFO);