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Diffstat (limited to 'arch/blackfin/mach-bf548/include/mach/pll.h')
-rw-r--r--arch/blackfin/mach-bf548/include/mach/pll.h69
1 files changed, 69 insertions, 0 deletions
diff --git a/arch/blackfin/mach-bf548/include/mach/pll.h b/arch/blackfin/mach-bf548/include/mach/pll.h
new file mode 100644
index 000000000000..777fee61fab8
--- /dev/null
+++ b/arch/blackfin/mach-bf548/include/mach/pll.h
@@ -0,0 +1,69 @@
+/*
+ * Copyright 2007-2008 Analog Devices Inc.
+ *
+ * Licensed under the GPL-2 or later.
+ */
+
+#ifndef _MACH_PLL_H
+#define _MACH_PLL_H
+
+#include <asm/blackfin.h>
+#include <asm/irqflags.h>
+
+/* Writing to PLL_CTL initiates a PLL relock sequence. */
+static __inline__ void bfin_write_PLL_CTL(unsigned int val)
+{
+ unsigned long flags, iwr0, iwr1, iwr2;
+
+ if (val == bfin_read_PLL_CTL())
+ return;
+
+ local_irq_save_hw(flags);
+ /* Enable the PLL Wakeup bit in SIC IWR */
+ iwr0 = bfin_read32(SIC_IWR0);
+ iwr1 = bfin_read32(SIC_IWR1);
+ iwr2 = bfin_read32(SIC_IWR2);
+ /* Only allow PPL Wakeup) */
+ bfin_write32(SIC_IWR0, IWR_ENABLE(0));
+ bfin_write32(SIC_IWR1, 0);
+ bfin_write32(SIC_IWR2, 0);
+
+ bfin_write16(PLL_CTL, val);
+ SSYNC();
+ asm("IDLE;");
+
+ bfin_write32(SIC_IWR0, iwr0);
+ bfin_write32(SIC_IWR1, iwr1);
+ bfin_write32(SIC_IWR2, iwr2);
+ local_irq_restore_hw(flags);
+}
+
+/* Writing to VR_CTL initiates a PLL relock sequence. */
+static __inline__ void bfin_write_VR_CTL(unsigned int val)
+{
+ unsigned long flags, iwr0, iwr1, iwr2;
+
+ if (val == bfin_read_VR_CTL())
+ return;
+
+ local_irq_save_hw(flags);
+ /* Enable the PLL Wakeup bit in SIC IWR */
+ iwr0 = bfin_read32(SIC_IWR0);
+ iwr1 = bfin_read32(SIC_IWR1);
+ iwr2 = bfin_read32(SIC_IWR2);
+ /* Only allow PPL Wakeup) */
+ bfin_write32(SIC_IWR0, IWR_ENABLE(0));
+ bfin_write32(SIC_IWR1, 0);
+ bfin_write32(SIC_IWR2, 0);
+
+ bfin_write16(VR_CTL, val);
+ SSYNC();
+ asm("IDLE;");
+
+ bfin_write32(SIC_IWR0, iwr0);
+ bfin_write32(SIC_IWR1, iwr1);
+ bfin_write32(SIC_IWR2, iwr2);
+ local_irq_restore_hw(flags);
+}
+
+#endif /* _MACH_PLL_H */