diff options
Diffstat (limited to 'boards/at91sam3x-ek/board_lowlevel.c')
| -rw-r--r-- | boards/at91sam3x-ek/board_lowlevel.c | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/boards/at91sam3x-ek/board_lowlevel.c b/boards/at91sam3x-ek/board_lowlevel.c new file mode 100644 index 0000000..f78cac3 --- /dev/null +++ b/boards/at91sam3x-ek/board_lowlevel.c @@ -0,0 +1,111 @@ +/* ----------------------------------------------------------------------------
+ * ATMEL Microcontroller Software Support
+ * ----------------------------------------------------------------------------
+ * Copyright (c) 2008, Atmel Corporation
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the disclaimer below.
+ *
+ * Atmel's name may not be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
+ * DISCLAIMED. IN NO EVENT SHALL ATMEL 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.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+/// \unit
+///
+/// !Purpose
+///
+/// Provides the low-level initialization function that gets called on chip
+/// startup.
+///
+/// !Usage
+///
+/// LowLevelInit() is called in #board_cstartup.S#.
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+// Headers
+//------------------------------------------------------------------------------
+
+#include "board.h"
+#include "board_memories.h"
+
+//------------------------------------------------------------------------------
+// Local definitions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+// Global variables
+//------------------------------------------------------------------------------
+
+// SUPC status value read during LowLevelInit(), discarded by read.
+//unsigned int gLowLevelInitSupcStatus;
+
+//------------------------------------------------------------------------------
+// Local functions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+// Exported functions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// Performs the low-level initialization of the chip. This includes EFC, master
+/// clock, AIC & watchdog configuration, as well as memory remapping.
+//------------------------------------------------------------------------------
+void LowLevelInit(void)
+{
+ unsigned int tmp;
+
+ // Setup the PSRAM (HSMC4_EBI.CS1, 0x61000000 ~ 0x61FFFFFF)
+ AT91C_BASE_HSMC4_CS1->HSMC4_SETUP = 0
+ | ((0 << 0) & AT91C_HSMC4_NWE_SETUP)
+ | ((0 << 8) & AT91C_HSMC4_NCS_WR_SETUP)
+ | ((0 << 16) & AT91C_HSMC4_NRD_SETUP)
+ | ((0 << 24) & AT91C_HSMC4_NCS_RD_SETUP)
+ ;
+ AT91C_BASE_HSMC4_CS1->HSMC4_PULSE = 0
+ | ((2 << 0) & AT91C_HSMC4_NWE_PULSE)
+ | ((2 << 8) & AT91C_HSMC4_NCS_WR_PULSE)
+ | ((2 << 16) & AT91C_HSMC4_NRD_PULSE)
+ | ((2 << 24) & AT91C_HSMC4_NCS_RD_PULSE)
+ ;
+ AT91C_BASE_HSMC4_CS1->HSMC4_CYCLE = 0
+ | ((2 << 0) & AT91C_HSMC4_NWE_CYCLE)
+ | ((2 << 16) & AT91C_HSMC4_NRD_CYCLE)
+ ;
+
+ tmp = AT91C_BASE_HSMC4_CS1->HSMC4_TIMINGS
+ & (AT91C_HSMC4_OCMSEN | AT91C_HSMC4_RBNSEL | AT91C_HSMC4_NFSEL);
+ AT91C_BASE_HSMC4_CS1->HSMC4_TIMINGS = tmp
+ | ((0 << 0) & AT91C_HSMC4_TCLR) // CLE to REN
+ | ((0 << 4) & AT91C_HSMC4_TADL) // ALE to Data
+ | ((0 << 8) & AT91C_HSMC4_TAR) // ALE to REN
+ | ((0 << 16) & AT91C_HSMC4_TRR) // Ready to REN
+ | ((0 << 24) & AT91C_HSMC4_TWB) // WEN to REN
+ ;
+ tmp = AT91C_BASE_HSMC4_CS1->HSMC4_MODE & ~(AT91C_HSMC4_DBW);
+ AT91C_BASE_HSMC4_CS1->HSMC4_MODE = tmp
+ | (AT91C_HSMC4_READ_MODE)
+ | (AT91C_HSMC4_WRITE_MODE)
+ | (AT91C_HSMC4_DBW_WIDTH_SIXTEEN_BITS)
+ | (AT91C_HSMC4_PMEN)
+ ;
+}
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