diff options
Diffstat (limited to 'include/asm-blackfin/mach-bf537')
| -rw-r--r-- | include/asm-blackfin/mach-bf537/cdefBF534.h | 31 |
1 files changed, 27 insertions, 4 deletions
diff --git a/include/asm-blackfin/mach-bf537/cdefBF534.h b/include/asm-blackfin/mach-bf537/cdefBF534.h index 048d26a61fd..82de526f809 100644 --- a/include/asm-blackfin/mach-bf537/cdefBF534.h +++ b/include/asm-blackfin/mach-bf537/cdefBF534.h @@ -44,7 +44,27 @@ /* Clock and System Control (0xFFC00000 - 0xFFC000FF) */ #define bfin_read_PLL_CTL() bfin_read16(PLL_CTL) -#define bfin_write_PLL_CTL(val) bfin_write16(PLL_CTL,val) +/* Writing to PLL_CTL initiates a PLL relock sequence. */ +static __inline__ void bfin_write_PLL_CTL(unsigned int val) +{ + unsigned long flags, iwr; + + if (val == bfin_read_PLL_CTL()) + return; + + local_irq_save(flags); + /* Enable the PLL Wakeup bit in SIC IWR */ + iwr = bfin_read32(SIC_IWR); + /* Only allow PPL Wakeup) */ + bfin_write32(SIC_IWR, IWR_ENABLE(0)); + + bfin_write16(PLL_CTL, val); + SSYNC(); + asm("IDLE;"); + + bfin_write32(SIC_IWR, iwr); + local_irq_restore(flags); +} #define bfin_read_PLL_DIV() bfin_read16(PLL_DIV) #define bfin_write_PLL_DIV(val) bfin_write16(PLL_DIV,val) #define bfin_read_VR_CTL() bfin_read16(VR_CTL) @@ -53,6 +73,10 @@ static __inline__ void bfin_write_VR_CTL(unsigned int val) { unsigned long flags, iwr; + if (val == bfin_read_VR_CTL()) + return; + + local_irq_save(flags); /* Enable the PLL Wakeup bit in SIC IWR */ iwr = bfin_read32(SIC_IWR); /* Only allow PPL Wakeup) */ @@ -60,11 +84,10 @@ static __inline__ void bfin_write_VR_CTL(unsigned int val) bfin_write16(VR_CTL, val); SSYNC(); - - local_irq_save(flags); asm("IDLE;"); - local_irq_restore(flags); + bfin_write32(SIC_IWR, iwr); + local_irq_restore(flags); } #define bfin_read_PLL_STAT() bfin_read16(PLL_STAT) #define bfin_write_PLL_STAT(val) bfin_write16(PLL_STAT,val) |