summaryrefslogtreecommitdiffstats
path: root/plat/imx/common/imx7_clock.c
diff options
context:
space:
mode:
Diffstat (limited to 'plat/imx/common/imx7_clock.c')
-rw-r--r--plat/imx/common/imx7_clock.c55
1 files changed, 55 insertions, 0 deletions
diff --git a/plat/imx/common/imx7_clock.c b/plat/imx/common/imx7_clock.c
new file mode 100644
index 0000000..6bd2e0e
--- /dev/null
+++ b/plat/imx/common/imx7_clock.c
@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+#include <imx_regs.h>
+#include <imx_clock.h>
+
+static void imx7_clock_uart_init(void)
+{
+ unsigned int i;
+
+ for (i = 0; i < MXC_MAX_UART_NUM; i++)
+ imx_clock_disable_uart(i);
+}
+
+static void imx7_clock_wdog_init(void)
+{
+ unsigned int i;
+
+ for (i = 0; i < MXC_MAX_WDOG_NUM; i++)
+ imx_clock_disable_wdog(i);
+}
+
+static void imx7_clock_usb_init(void)
+{
+ /* Disable the clock root */
+ imx_clock_target_clr(CCM_TRT_ID_USB_HSIC_CLK_ROOT, 0xFFFFFFFF);
+}
+
+void imx_clock_init(void)
+{
+ /*
+ * The BootROM hands off to the next stage with the internal 24 MHz XTAL
+ * crystal already clocking the main PLL, which is very handy.
+ * Here we should enable whichever peripherals are required for ATF and
+ * OPTEE.
+ *
+ * Subsequent stages in the boot process such as u-boot and Linux
+ * already have a significant and mature code-base around clocks, so our
+ * objective should be to enable what we need for ATF/OPTEE without
+ * breaking any existing upstream code in Linux and u-boot.
+ */
+
+ /* Initialize UART clocks */
+ imx7_clock_uart_init();
+
+ /* Watchdog clocks */
+
+ imx7_clock_wdog_init();
+
+ /* USB clocks */
+ imx7_clock_usb_init();
+
+}