| David Howells | 3dcc1e7 | 2010-10-07 14:08:49 +0100 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2007-2008 Analog Devices Inc. |
| 3 | * |
| 4 | * Licensed under the GPL-2 or later |
| 5 | */ |
| 6 | |
| 7 | #ifndef _MACH_PLL_H |
| 8 | #define _MACH_PLL_H |
| 9 | |
| 10 | #include <asm/blackfin.h> |
| 11 | #include <asm/irqflags.h> |
| 12 | |
| 13 | /* Writing to PLL_CTL initiates a PLL relock sequence. */ |
| 14 | static __inline__ void bfin_write_PLL_CTL(unsigned int val) |
| 15 | { |
| 16 | unsigned long flags, iwr0, iwr1; |
| 17 | |
| 18 | if (val == bfin_read_PLL_CTL()) |
| 19 | return; |
| 20 | |
| 21 | local_irq_save_hw(flags); |
| 22 | /* Enable the PLL Wakeup bit in SIC IWR */ |
| 23 | iwr0 = bfin_read32(SIC_IWR0); |
| 24 | iwr1 = bfin_read32(SIC_IWR1); |
| 25 | /* Only allow PPL Wakeup) */ |
| 26 | bfin_write32(SIC_IWR0, IWR_ENABLE(0)); |
| 27 | bfin_write32(SIC_IWR1, 0); |
| 28 | |
| 29 | bfin_write16(PLL_CTL, val); |
| 30 | SSYNC(); |
| 31 | asm("IDLE;"); |
| 32 | |
| 33 | bfin_write32(SIC_IWR0, iwr0); |
| 34 | bfin_write32(SIC_IWR1, iwr1); |
| 35 | local_irq_restore_hw(flags); |
| 36 | } |
| 37 | |
| 38 | /* Writing to VR_CTL initiates a PLL relock sequence. */ |
| 39 | static __inline__ void bfin_write_VR_CTL(unsigned int val) |
| 40 | { |
| 41 | unsigned long flags, iwr0, iwr1; |
| 42 | |
| 43 | if (val == bfin_read_VR_CTL()) |
| 44 | return; |
| 45 | |
| 46 | local_irq_save_hw(flags); |
| 47 | /* Enable the PLL Wakeup bit in SIC IWR */ |
| 48 | iwr0 = bfin_read32(SIC_IWR0); |
| 49 | iwr1 = bfin_read32(SIC_IWR1); |
| 50 | /* Only allow PPL Wakeup) */ |
| 51 | bfin_write32(SIC_IWR0, IWR_ENABLE(0)); |
| 52 | bfin_write32(SIC_IWR1, 0); |
| 53 | |
| 54 | bfin_write16(VR_CTL, val); |
| 55 | SSYNC(); |
| 56 | asm("IDLE;"); |
| 57 | |
| 58 | bfin_write32(SIC_IWR0, iwr0); |
| 59 | bfin_write32(SIC_IWR1, iwr1); |
| 60 | local_irq_restore_hw(flags); |
| 61 | } |
| 62 | |
| 63 | #endif /* _MACH_PLL_H */ |