imx: imx_io_mux: Define an IO-mux layer
This patch defines:
- The full range of IO-mux register offsets relative to the base address of
the IO-mux block base address.
- The bits for muxing the UART1 TX/RX lines.
- The bits for muxing the UART6 TX/RX lines.
- The pad control pad bits for the UART
Two functions are provided to configure pad muxes:
- void io_muxc_set_pad_alt_function(pad_mux_offset, alt_function)
Takes a pad_mux_offset and sets the alt_function bit-mask supplied.
This will have the effect of switching the pad into one of its defined
peripheral functions. These peripheral function modes are defined in the
NXP documentation and need to be referred to in order to correctly
configure a new alternative-function.
- void io_muxc_set_pad_features(pad_feature_offset, pad_features)
Takes a pad_feature_offset and applies a pad_features bit-mask to the
indicated pad.
This function allows the setting of PAD drive-strength, pull-up values,
hysteresis glitch filters and slew-rate settings.
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
diff --git a/plat/imx/common/imx_io_mux.c b/plat/imx/common/imx_io_mux.c
new file mode 100644
index 0000000..7230647
--- /dev/null
+++ b/plat/imx/common/imx_io_mux.c
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <mmio.h>
+#include <imx_regs.h>
+#include <imx_io_mux.h>
+
+void imx_io_muxc_set_pad_alt_function(uint32_t pad_mux_offset, uint32_t alt_function)
+{
+ uintptr_t addr = (uintptr_t)(MXC_IO_MUXC_BASE + pad_mux_offset);
+
+ mmio_write_32(addr, alt_function);
+}
+
+void imx_io_muxc_set_pad_features(uint32_t pad_feature_offset, uint32_t pad_features)
+{
+ uintptr_t addr = (uintptr_t)(MXC_IO_MUXC_BASE + pad_feature_offset);
+
+ mmio_write_32(addr, pad_features);
+}