rpi3: Move rng driver to drivers
To allow sharing the driver between the RPi3 and RPi4, move the random
number generator driver into the generic driver directory.
Change-Id: Iae94d7cb22c6bce3af9bff709d76d4caf87b14d1
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/plat/rpi/rpi3/platform.mk b/plat/rpi/rpi3/platform.mk
index b0e7b70..21a880c 100644
--- a/plat/rpi/rpi3/platform.mk
+++ b/plat/rpi/rpi3/platform.mk
@@ -1,5 +1,5 @@
#
-# Copyright (c) 2013-2018, ARM Limited and Contributors. All rights reserved.
+# Copyright (c) 2013-2019, ARM Limited and Contributors. All rights reserved.
#
# SPDX-License-Identifier: BSD-3-Clause
#
@@ -159,7 +159,7 @@
endif
ifneq ($(ENABLE_STACK_PROTECTOR), 0)
-PLAT_BL_COMMON_SOURCES += plat/rpi/rpi3/rpi3_rng.c \
+PLAT_BL_COMMON_SOURCES += drivers/rpi3/rng/rpi3_rng.c \
plat/rpi/rpi3/rpi3_stack_protector.c
endif
diff --git a/plat/rpi/rpi3/rpi3_private.h b/plat/rpi/rpi3/rpi3_private.h
index 53078f8..b01c40c 100644
--- a/plat/rpi/rpi3/rpi3_private.h
+++ b/plat/rpi/rpi3/rpi3_private.h
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2015-2018, ARM Limited and Contributors. All rights reserved.
+ * Copyright (c) 2015-2019, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -33,9 +33,6 @@
/* IO storage utility functions */
void plat_rpi3_io_setup(void);
-/* Hardware RNG functions */
-void rpi3_rng_read(void *buf, size_t len);
-
/* VideoCore firmware commands */
int rpi3_vc_hardware_get_board_revision(uint32_t *revision);
diff --git a/plat/rpi/rpi3/rpi3_rng.c b/plat/rpi/rpi3/rpi3_rng.c
deleted file mode 100644
index b6bf005..0000000
--- a/plat/rpi/rpi3/rpi3_rng.c
+++ /dev/null
@@ -1,75 +0,0 @@
-/*
- * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-#include <assert.h>
-#include <string.h>
-
-#include <lib/mmio.h>
-
-#include <rpi_hw.h>
-
-/* Initial amount of values to discard */
-#define RNG_WARMUP_COUNT U(0x40000)
-
-static void rpi3_rng_initialize(void)
-{
- uint32_t int_mask, ctrl;
-
- /* Return if it is already enabled */
- ctrl = mmio_read_32(RPI3_RNG_BASE + RPI3_RNG_CTRL_OFFSET);
- if ((ctrl & RPI3_RNG_CTRL_ENABLE) != 0U) {
- return;
- }
-
- /* Mask interrupts */
- int_mask = mmio_read_32(RPI3_RNG_BASE + RPI3_RNG_INT_MASK_OFFSET);
- int_mask |= RPI3_RNG_INT_MASK_DISABLE;
- mmio_write_32(RPI3_RNG_BASE + RPI3_RNG_INT_MASK_OFFSET, int_mask);
-
- /* Discard several values when initializing to give it time to warmup */
- mmio_write_32(RPI3_RNG_BASE + RPI3_RNG_STATUS_OFFSET, RNG_WARMUP_COUNT);
-
- mmio_write_32(RPI3_RNG_BASE + RPI3_RNG_CTRL_OFFSET,
- RPI3_RNG_CTRL_ENABLE);
-}
-
-static uint32_t rpi3_rng_get_word(void)
-{
- size_t nwords;
-
- do {
- /* Get number of available words to read */
- nwords = (mmio_read_32(RPI3_RNG_BASE + RPI3_RNG_STATUS_OFFSET)
- >> RPI3_RNG_STATUS_NUM_WORDS_SHIFT)
- & RPI3_RNG_STATUS_NUM_WORDS_MASK;
- } while (nwords == 0U);
-
- return mmio_read_32(RPI3_RNG_BASE + RPI3_RNG_DATA_OFFSET);
-}
-
-void rpi3_rng_read(void *buf, size_t len)
-{
- uint32_t data;
- size_t left = len;
- uint32_t *dst = buf;
-
- assert(buf != NULL);
- assert(len != 0U);
- assert(check_uptr_overflow((uintptr_t) buf, (uintptr_t) len) == 0);
-
- rpi3_rng_initialize();
-
- while (left >= sizeof(uint32_t)) {
- data = rpi3_rng_get_word();
- *dst++ = data;
- left -= sizeof(uint32_t);
- }
-
- if (left > 0U) {
- data = rpi3_rng_get_word();
- memcpy(dst, &data, left);
- }
-}