1 files changed, 115 insertions, 0 deletions
diff --git a/boards/at91sam7a3-ek/board_powermode.c b/boards/at91sam7a3-ek/board_powermode.c
new file mode 100644
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+++ b/boards/at91sam7a3-ek/board_powermode.c
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+/* ----------------------------------------------------------------------------
+ *         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.
+ * ----------------------------------------------------------------------------
+ */
+
+//------------------------------------------------------------------------------
+//         Headers
+//------------------------------------------------------------------------------
+
+#include "board.h"
+#include <pmc/pmc.h>
+
+//------------------------------------------------------------------------------
+//         Internal definitions
+//------------------------------------------------------------------------------
+
+#define NORMAL_POWER_MODE   0
+#define LOW_POWER_MODE      1
+
+//------------------------------------------------------------------------------
+//         Internal variables
+//------------------------------------------------------------------------------
+
+static volatile unsigned char powerMode = NORMAL_POWER_MODE;
+
+//------------------------------------------------------------------------------
+//         Internal functions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+//         Exported functions
+//------------------------------------------------------------------------------
+
+//------------------------------------------------------------------------------
+/// Put the CPU in 32kHz, disable PLL, main oscillator
+/// Put voltage regulator in standby mode
+/// USB clock is automatically disabled.
+//------------------------------------------------------------------------------
+void LowPowerMode(void)
+{
+    if (powerMode == LOW_POWER_MODE)
+        return;
+
+    powerMode = LOW_POWER_MODE;
+
+    // MCK=48MHz to MCK=32kHz
+    // MCK = SLCK/2 : change source first from 48 000 000 to 18. / 2 = 9M
+    AT91C_BASE_PMC->PMC_MCKR = AT91C_PMC_PRES_CLK_2;
+    while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY ) );
+    // MCK=SLCK : then change prescaler
+    AT91C_BASE_PMC->PMC_MCKR = AT91C_PMC_CSS_SLOW_CLK;
+    while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY ) );
+    // disable PLL
+    AT91C_BASE_PMC->PMC_PLLR = 0;
+    // Disable Main Oscillator
+    AT91C_BASE_PMC->PMC_MOR = 0;
+
+    PMC_DisableProcessorClock();
+}
+
+//------------------------------------------------------------------------------
+/// Put voltage regulator in normal mode
+/// Return the CPU to normal speed enable PLLs, main oscillator
+/// USB clock is automatically enabled.
+//------------------------------------------------------------------------------
+void NormalPowerMode(void)
+{
+    if (powerMode == NORMAL_POWER_MODE)
+        return;
+
+    // MCK=32kHz to MCK=48MHz
+    // enable Main Oscillator
+    AT91C_BASE_PMC->PMC_MOR = (( (AT91C_CKGR_OSCOUNT & (0x06 <<8)) | AT91C_CKGR_MOSCEN ));
+    while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MOSCS ) );
+
+    // enable PLL@96MHz
+    AT91C_BASE_PMC->PMC_PLLR = ((AT91C_CKGR_DIV & 0x0E) |
+         (AT91C_CKGR_PLLCOUNT & (28<<8)) |
+         (AT91C_CKGR_MUL & (0x48<<16)));
+    while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_LOCK ) );
+    while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY ) );
+    AT91C_BASE_CKGR->CKGR_PLLR |= AT91C_CKGR_USBDIV_1 ;
+    // MCK=SLCK/2 : change prescaler first
+    AT91C_BASE_PMC->PMC_MCKR = AT91C_PMC_PRES_CLK_2;
+    while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY ) );
+    // MCK=PLLCK/2 : then change source
+    AT91C_BASE_PMC->PMC_MCKR |= AT91C_PMC_CSS_PLL_CLK  ;
+    while( !( AT91C_BASE_PMC->PMC_SR & AT91C_PMC_MCKRDY ) );
+    
+    powerMode = NORMAL_POWER_MODE;
+}