arch/arm/mach-uniphier/ph1-pro4/pll_init.c

   1 /*
   2  * Copyright (C) 2011-2014 Panasonic Corporation
   3  *
   4  * SPDX-License-Identifier:     GPL-2.0+
   5  */
   6
   7 #include <common.h>
   8 #include <asm/io.h>
   9 #include <mach/sc-regs.h>
  10 #include <mach/sg-regs.h>
  11
  12 #undef DPLL_SSC_RATE_1PER
  13
  14 static void dpll_init(void)
  15 {
  16         u32 tmp;
  17
  18         /*
  19          * Set Frequency
  20          * Set 0xc(1600MHz)/0xd(1333MHz)/0xe(1066MHz)
  21          * to FOUT ( DPLLCTRL.bit[29:20] )
  22          */
  23         tmp = readl(SC_DPLLCTRL);
  24         tmp &= ~(0x000f0000);
  25 #if CONFIG_DDR_FREQ == 1600
  26         tmp |= 0x000c0000;
  27 #elif CONFIG_DDR_FREQ == 1333
  28         tmp |= 0x000d0000;
  29 #else
  30 # error "Unsupported frequency"
  31 #endif
  32
  33         /*
  34          * Set Moduration rate
  35          * Set 0x0(1%)/0x1(2%) to SSC_RATE(DPLLCTRL.bit[15])
  36          */
  37 #if defined(DPLL_SSC_RATE_1PER)
  38         tmp &= ~0x00008000;
  39 #else
  40         tmp |= 0x00008000;
  41 #endif
  42         writel(tmp, SC_DPLLCTRL);
  43
  44         tmp = readl(SC_DPLLCTRL2);
  45         tmp |= SC_DPLLCTRL2_NRSTDS;
  46         writel(tmp, SC_DPLLCTRL2);
  47 }
  48
  49 static void stop_mpll(void)
  50 {
  51         u32 tmp;
  52
  53         tmp = readl(SC_MPLLOSCCTL);
  54
  55         if (!(tmp & SC_MPLLOSCCTL_MPLLST))
  56                 return; /* already stopped */
  57
  58         tmp &= ~SC_MPLLOSCCTL_MPLLEN;
  59         writel(tmp, SC_MPLLOSCCTL);
  60
  61         while (readl(SC_MPLLOSCCTL) & SC_MPLLOSCCTL_MPLLST)
  62                 ;
  63 }
  64
  65 static void vpll_init(void)
  66 {
  67         u32 tmp, clk_mode_axosel;
  68
  69         /* Set VPLL27A &  VPLL27B */
  70         tmp = readl(SG_PINMON0);
  71         clk_mode_axosel = tmp & SG_PINMON0_CLK_MODE_AXOSEL_MASK;
  72
  73 #if defined(CONFIG_MACH_PH1_PRO4)
  74         /* 25MHz or 6.25MHz is default for Pro4R, no need to set VPLLA/B */
  75         if (clk_mode_axosel == SG_PINMON0_CLK_MODE_AXOSEL_25000KHZ ||
  76             clk_mode_axosel == SG_PINMON0_CLK_MODE_AXOSEL_6250KHZ)
  77                 return;
  78 #endif
  79
  80         /* Disable write protect of VPLL27ACTRL[2-7]*, VPLL27BCTRL[2-8] */
  81         tmp = readl(SC_VPLL27ACTRL);
  82         tmp |= 0x00000001;
  83         writel(tmp, SC_VPLL27ACTRL);
  84         tmp = readl(SC_VPLL27BCTRL);
  85         tmp |= 0x00000001;
  86         writel(tmp, SC_VPLL27BCTRL);
  87
  88         /* Unset VPLA_K_LD and VPLB_K_LD bit */
  89         tmp = readl(SC_VPLL27ACTRL3);
  90         tmp &= ~0x10000000;
  91         writel(tmp, SC_VPLL27ACTRL3);
  92         tmp = readl(SC_VPLL27BCTRL3);
  93         tmp &= ~0x10000000;
  94         writel(tmp, SC_VPLL27BCTRL3);
  95
  96         /* Set VPLA_M and VPLB_M to 0x20 */
  97         tmp = readl(SC_VPLL27ACTRL2);
  98         tmp &= ~0x0000007f;
  99         tmp |= 0x00000020;
 100         writel(tmp, SC_VPLL27ACTRL2);
 101         tmp = readl(SC_VPLL27BCTRL2);
 102         tmp &= ~0x0000007f;
 103         tmp |= 0x00000020;
 104         writel(tmp, SC_VPLL27BCTRL2);
 105
 106         if (clk_mode_axosel == SG_PINMON0_CLK_MODE_AXOSEL_25000KHZ ||
 107             clk_mode_axosel == SG_PINMON0_CLK_MODE_AXOSEL_6250KHZ) {
 108                 /* Set VPLA_K and VPLB_K for AXO: 25MHz */
 109                 tmp = readl(SC_VPLL27ACTRL3);
 110                 tmp &= ~0x000fffff;
 111                 tmp |= 0x00066666;
 112                 writel(tmp, SC_VPLL27ACTRL3);
 113                 tmp = readl(SC_VPLL27BCTRL3);
 114                 tmp &= ~0x000fffff;
 115                 tmp |= 0x00066666;
 116                 writel(tmp, SC_VPLL27BCTRL3);
 117         } else {
 118                 /* Set VPLA_K and VPLB_K for AXO: 24.576 MHz */
 119                 tmp = readl(SC_VPLL27ACTRL3);
 120                 tmp &= ~0x000fffff;
 121                 tmp |= 0x000f5800;
 122                 writel(tmp, SC_VPLL27ACTRL3);
 123                 tmp = readl(SC_VPLL27BCTRL3);
 124                 tmp &= ~0x000fffff;
 125                 tmp |= 0x000f5800;
 126                 writel(tmp, SC_VPLL27BCTRL3);
 127         }
 128
 129         /* wait 1 usec */
 130         udelay(1);
 131
 132         /* Set VPLA_K_LD and VPLB_K_LD to load K parameters */
 133         tmp = readl(SC_VPLL27ACTRL3);
 134         tmp |= 0x10000000;
 135         writel(tmp, SC_VPLL27ACTRL3);
 136         tmp = readl(SC_VPLL27BCTRL3);
 137         tmp |= 0x10000000;
 138         writel(tmp, SC_VPLL27BCTRL3);
 139
 140         /* Unset VPLA_SNRST and VPLB_SNRST bit */
 141         tmp = readl(SC_VPLL27ACTRL2);
 142         tmp |= 0x10000000;
 143         writel(tmp, SC_VPLL27ACTRL2);
 144         tmp = readl(SC_VPLL27BCTRL2);
 145         tmp |= 0x10000000;
 146         writel(tmp, SC_VPLL27BCTRL2);
 147
 148         /* Enable write protect of VPLL27ACTRL[2-7]*, VPLL27BCTRL[2-8] */
 149         tmp = readl(SC_VPLL27ACTRL);
 150         tmp &= ~0x00000001;
 151         writel(tmp, SC_VPLL27ACTRL);
 152         tmp = readl(SC_VPLL27BCTRL);
 153         tmp &= ~0x00000001;
 154         writel(tmp, SC_VPLL27BCTRL);
 155 }
 156
 157 void pll_init(void)
 158 {
 159         dpll_init();
 160         stop_mpll();
 161         vpll_init();
 162
 163         /*
 164          * Wait 500 usec until dpll get stable
 165          * We wait 1 usec in vpll_init() so 1 usec can be saved here.
 166          */
 167         udelay(499);
 168 }