[PATCH v2 06/15] HiFive1: add PRCI support files

[Denis Obrezkov]

---
 c/src/lib/libbsp/riscv32/hifive1/include/prci.h | 75 +++++++++++++++++++++++++
 c/src/lib/libbsp/riscv32/hifive1/start/prci.c   | 32 +++++++++++
 2 files changed, 107 insertions(+)
 create mode 100644 c/src/lib/libbsp/riscv32/hifive1/include/prci.h
 create mode 100644 c/src/lib/libbsp/riscv32/hifive1/start/prci.c

diff --git a/c/src/lib/libbsp/riscv32/hifive1/include/prci.h b/c/src/lib/libbsp/riscv32/hifive1/include/prci.h
new file mode 100644
index 0000000..c71edbc
--- /dev/null
+++ b/c/src/lib/libbsp/riscv32/hifive1/include/prci.h
@@ -0,0 +1,75 @@
+/*
+ *
+ * Copyright (c) 2017
+ * Denis Obrezkov <denisobrezkov at gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef PRCI_H
+#define PRCI_H
+
+#include <stdint.h>
+
+/*
+ * PRCI description for HiFive1 system
+ */
+#define PRCI_BASE 0x10008000
+#define PRCI_HFROSCCFG 0x10008000
+#define PRCI_HFXOSCCFG 0x10008004
+#define PRCI_PLLCFG 0x10008008
+#define PRCI_PLLOUTDIV 0x1000800C
+#define PRCI_CORECLKCFG 0x10008010
+
+/*
+ * 16 MHz from external crystal oscillator
+ */
+#define hifive1_default_freq 16000000
+
+/* 
+ * HFROSCCFG configuration register values
+ */
+#define HFROSC_DIV_VAL 4
+#define HFROSC_TRIM_VAL 16
+#define HFROSC_EN_VAL 1
+#define HFROSC_RDY_VAL 1
+#define HFROSC_DIV_OFFSET 0
+#define HFROSC_TRIM_OFFSET 16
+#define HFROSC_EN_OFFSET 30
+#define HFROSC_RDY_OFFSET 31
+
+/* 
+ * HFXOSCCFG configuration register values
+ */
+#define HFXOSC_EN_VAL 1
+#define HFXOSC_RDY_VAL 1
+#define HFXOSC_EN_OFFSET 30
+#define HFXOSC_RDY_OFFSET 31
+
+/* 
+ * PLLCFG configuration register
+ */
+#define PLL_SEL_OFFSET 16
+
+uint32_t hifive1_current_freq();
+
+#endif /* PRCI_H */
diff --git a/c/src/lib/libbsp/riscv32/hifive1/start/prci.c b/c/src/lib/libbsp/riscv32/hifive1/start/prci.c
new file mode 100644
index 0000000..bf3d288
--- /dev/null
+++ b/c/src/lib/libbsp/riscv32/hifive1/start/prci.c
@@ -0,0 +1,32 @@
+/*
+ *
+ * Copyright (c) 2017
+ * Denis Obrezkov <denisobrezkov at gmail.com>
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <bsp/prci.h>
+
+uint32_t hifive1_current_freq() {
+  return hifive1_default_freq;
+}
-- 
2.1.4