More files for the Cortex-M0/NUC120 port

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@5659 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 180 insertions, 0 deletions

diff --git a/nuttx/arch/arm/src/nuc1xx/nuc_clockconfig.c b/nuttx/arch/arm/src/nuc1xx/nuc_clockconfig.c
new file mode 100644
index 000000000..b89d9e036
--- /dev/null
+++ b/nuttx/arch/arm/src/nuc1xx/nuc_clockconfig.c
@@ -0,0 +1,180 @@
+/****************************************************************************
+ * arch/arm/src/nuc1xx/nuc_clockconfig.c
+ *
+ *   Copyright (C) 2013 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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.
+ * 3. Neither the name NuttX nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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
+ * COPYRIGHT OWNER 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.
+ *
+ ****************************************************************************/
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdint.h>
+#include <assert.h>
+#include <debug.h>
+
+#include <nuttx/arch.h>
+
+#include <arch/board/board.h>
+
+#include "up_arch.h"
+
+#include "chip.h"
+#include "chip/chip/nuc_gcr.h"
+#include "chip/chip/nuc_clk.h"
+
+#include "nuc_clockconfig.h"
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: nuc_unlock
+ *
+ * Description:
+ *   Unlock registers
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+static inline void nuc_unlock(void)
+{
+  putreg32(0x59, NUC_GCR_REGWRPROT);
+  putreg32(0x16, NUC_GCR_REGWRPROT);
+  putreg32(0x88, NUC_GCR_REGWRPROT);
+}
+
+/****************************************************************************
+ * Name: nuclock
+ *
+ * Description:
+ *   Lok registers
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   None
+ *
+ ****************************************************************************/
+
+static inline void nuc_lock(void)
+{
+  putreg32(0, NUC_GCR_REGWRPROT);
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/************************************************************************************
+ * Name: nuc_clockconfig
+ *
+ * Description:
+ *   Called to establish the clock settings based on the values in board.h.
+ *
+ * Input Parameters:
+ *   None
+ *
+ * Returned Value:
+ *   None
+ *
+ ************************************************************************************/
+
+void nuc_clockconfig(void)
+{
+  uint32_t regval;
+
+  /* Unlock registers */
+
+  nuc_unlock();
+
+  /* Enable External 4~24 mhz high speed crystal */
+
+  regval = getreg32(NUC_CLK_PWRCON);
+  regval |= CLK_PWRCON_XTL12M_EN;
+  putreg32(regval, NUC_CLK_PWRCON);
+
+  /* Delay to assure that crystal input to be stable */
+
+  up_mdelay(5);
+
+  /* Set up the PLL configuration.
+   *
+   * Feedback divider (FB_DV)   = Determined by settings in board.h
+   * Input divider (IN_DV)      = Determined by settings in board.h
+   * Output divider (OUT_DV)    = Determined by settings in board.h
+   * Power down mode (PD)       = Normal mode (0)
+   * Bypass (BP)                = Normal mode (0)
+   * FOUT enable (OE)           = PLL FOUT enabled (0)
+   * PLL srouce clock (PLL_SRC) = External high speed crystal (0)
+   */
+
+  regval = getreg32(NUC_CLK_PLLCON);
+  regval &= ~(CLK_PLLCON_FB_DV_MASK | CLK_PLLCON_IN_DV_MASK |
+              CLK_PLLCON_OUT_DV_MASK | CLK_PLLCON_PD | CLK_PLLCON_BP |
+              CLK_PLLCON_OE | CLK_PLLCON_PLL_SRC);
+  regval |=  (CLK_PLLCON_FB_DV(BOARD_PLL_FB_DV) |
+              CLK_PLLCON_IN_DV(BOARD_PLL_IN_DV) |
+              CLK_PLLCON_OUT_DV(BOARD_PLL_OUT_DV));
+  putreg32(regval, NUC_CLK_PLLCON);
+
+  /* Delay until the PLL output is stable */
+
+  up_mdelay(5);
+
+  /* Set the HCLK divider per settings from the board.h file */
+
+  regval = getreg32(NUC_CLK_CLKDIV);
+  regval &= ~CLK_CLKDIV_HCLK_N_MASK;
+  regval |=  CLK_CLKDIV_HCLK_N(BOARD_HCLK_N);
+  putreg32(regval, NUC_CLK_CLKDIV);
+
+  /* Select the PLL output as the HCLKC source */
+
+  regval = getreg32(NUC_CLK_CLKSEL0);
+  regval &= ~CLK_CLKSEL0_HCLK_S_MASK;
+  regval |= CLK_CLKSEL0_HCLK_S_PLL;
+  putreg32(regval, NUC_CLK_CLKSEL0);
+  up_mdelay(1);
+
+  /* Lock the registers */
+
+  nuc_lock();
+}