kernel/arch/blackfin/mach-common/dpmc_modes.S

   1 /*
   2  * Copyright 2004-2008 Analog Devices Inc.
   3  *
   4  * Licensed under the GPL-2 or later.
   5  */
   6
   7 #include <linux/linkage.h>
   8 #include <asm/blackfin.h>
   9 #include <mach/irq.h>
  10 #include <asm/dpmc.h>
  11
  12 .section .l1.text
  13 ENTRY(_sleep_mode)
  14         [--SP] = (R7:4, P5:3);
  15         [--SP] = RETS;
  16
  17         call _set_sic_iwr;
  18
  19         P0.H = hi(PLL_CTL);
  20         P0.L = lo(PLL_CTL);
  21         R1 = W[P0](z);
  22         BITSET (R1, 3);
  23         W[P0] = R1.L;
  24
  25         CLI R2;
  26         SSYNC;
  27         IDLE;
  28         STI R2;
  29
  30         call _test_pll_locked;
  31
  32         R0 = IWR_ENABLE(0);
  33         R1 = IWR_DISABLE_ALL;
  34         R2 = IWR_DISABLE_ALL;
  35
  36         call _set_sic_iwr;
  37
  38         P0.H = hi(PLL_CTL);
  39         P0.L = lo(PLL_CTL);
  40         R7 = w[p0](z);
  41         BITCLR (R7, 3);
  42         BITCLR (R7, 5);
  43         w[p0] = R7.L;
  44         IDLE;
  45
  46         bfin_init_pm_bench_cycles;
  47
  48         call _test_pll_locked;
  49
  50         RETS = [SP++];
  51         (R7:4, P5:3) = [SP++];
  52         RTS;
  53 ENDPROC(_sleep_mode)
  54
  55 /*
  56  * This func never returns as it puts the part into hibernate, and
  57  * is only called from do_hibernate, so we don't bother saving or
  58  * restoring any of the normal C runtime state.  When we wake up,
  59  * the entry point will be in do_hibernate and not here.
  60  *
  61  * We accept just one argument -- the value to write to VR_CTL.
  62  */
  63
  64 ENTRY(_hibernate_mode)
  65         /* Save/setup the regs we need early for minor pipeline optimization */
  66         R4 = R0;
  67
  68         P3.H = hi(VR_CTL);
  69         P3.L = lo(VR_CTL);
  70         /* Disable all wakeup sources */
  71         R0 = IWR_DISABLE_ALL;
  72         R1 = IWR_DISABLE_ALL;
  73         R2 = IWR_DISABLE_ALL;
  74         call _set_sic_iwr;
  75         call _set_dram_srfs;
  76         SSYNC;
  77
  78         /* Finally, we climb into our cave to hibernate */
  79         W[P3] = R4.L;
  80
  81         bfin_init_pm_bench_cycles;
  82
  83         CLI R2;
  84         IDLE;
  85 .Lforever:
  86         jump .Lforever;
  87 ENDPROC(_hibernate_mode)
  88
  89 ENTRY(_sleep_deeper)
  90         [--SP] = (R7:4, P5:3);
  91         [--SP] = RETS;
  92
  93         CLI R4;
  94
  95         P3 = R0;
  96         P4 = R1;
  97         P5 = R2;
  98
  99         R0 = IWR_ENABLE(0);
 100         R1 = IWR_DISABLE_ALL;
 101         R2 = IWR_DISABLE_ALL;
 102
 103         call _set_sic_iwr;
 104         call _set_dram_srfs;    /* Set SDRAM Self Refresh */
 105
 106         P0.H = hi(PLL_DIV);
 107         P0.L = lo(PLL_DIV);
 108         R6 = W[P0](z);
 109         R0.L = 0xF;
 110         W[P0] = R0.l;           /* Set Max VCO to SCLK divider */
 111
 112         P0.H = hi(PLL_CTL);
 113         P0.L = lo(PLL_CTL);
 114         R5 = W[P0](z);
 115         R0.L = (CONFIG_MIN_VCO_HZ/CONFIG_CLKIN_HZ) << 9;
 116         W[P0] = R0.l;           /* Set Min CLKIN to VCO multiplier */
 117
 118         SSYNC;
 119         IDLE;
 120
 121         call _test_pll_locked;
 122
 123         P0.H = hi(VR_CTL);
 124         P0.L = lo(VR_CTL);
 125         R7 = W[P0](z);
 126         R1 = 0x6;
 127         R1 <<= 16;
 128         R2 = 0x0404(Z);
 129         R1 = R1|R2;
 130
 131         R2 = DEPOSIT(R7, R1);
 132         W[P0] = R2;             /* Set Min Core Voltage */
 133
 134         SSYNC;
 135         IDLE;
 136
 137         call _test_pll_locked;
 138
 139         R0 = P3;
 140         R1 = P4;
 141         R3 = P5;
 142         call _set_sic_iwr;      /* Set Awake from IDLE */
 143
 144         P0.H = hi(PLL_CTL);
 145         P0.L = lo(PLL_CTL);
 146         R0 = W[P0](z);
 147         BITSET (R0, 3);
 148         W[P0] = R0.L;           /* Turn CCLK OFF */
 149         SSYNC;
 150         IDLE;
 151
 152         call _test_pll_locked;
 153
 154         R0 = IWR_ENABLE(0);
 155         R1 = IWR_DISABLE_ALL;
 156         R2 = IWR_DISABLE_ALL;
 157
 158         call _set_sic_iwr;      /* Set Awake from IDLE PLL */
 159
 160         P0.H = hi(VR_CTL);
 161         P0.L = lo(VR_CTL);
 162         W[P0]= R7;
 163
 164         SSYNC;
 165         IDLE;
 166
 167         bfin_init_pm_bench_cycles;
 168
 169         call _test_pll_locked;
 170
 171         P0.H = hi(PLL_DIV);
 172         P0.L = lo(PLL_DIV);
 173         W[P0]= R6;              /* Restore CCLK and SCLK divider */
 174
 175         P0.H = hi(PLL_CTL);
 176         P0.L = lo(PLL_CTL);
 177         w[p0] = R5;             /* Restore VCO multiplier */
 178         IDLE;
 179         call _test_pll_locked;
 180
 181         call _unset_dram_srfs;  /* SDRAM Self Refresh Off */
 182
 183         STI R4;
 184
 185         RETS = [SP++];
 186         (R7:4, P5:3) = [SP++];
 187         RTS;
 188 ENDPROC(_sleep_deeper)
 189
 190 ENTRY(_set_dram_srfs)
 191         /*  set the dram to self refresh mode */
 192         SSYNC;
 193 #if defined(EBIU_RSTCTL)        /* DDR */
 194         P0.H = hi(EBIU_RSTCTL);
 195         P0.L = lo(EBIU_RSTCTL);
 196         R2 = [P0];
 197         BITSET(R2, 3); /* SRREQ enter self-refresh mode */
 198         [P0] = R2;
 199         SSYNC;
 200 1:
 201         R2 = [P0];
 202         CC = BITTST(R2, 4);
 203         if !CC JUMP 1b;
 204 #else                           /* SDRAM */
 205         P0.L = lo(EBIU_SDGCTL);
 206         P0.H = hi(EBIU_SDGCTL);
 207         P1.L = lo(EBIU_SDSTAT);
 208         P1.H = hi(EBIU_SDSTAT);
 209
 210         R2 = [P0];
 211         BITSET(R2, 24); /* SRFS enter self-refresh mode */
 212         [P0] = R2;
 213         SSYNC;
 214
 215 1:
 216         R2 = w[P1];
 217         SSYNC;
 218         cc = BITTST(R2, 1); /* SDSRA poll self-refresh status */
 219         if !cc jump 1b;
 220
 221         R2 = [P0];
 222         BITCLR(R2, 0); /* SCTLE disable CLKOUT */
 223         [P0] = R2;
 224 #endif
 225         RTS;
 226 ENDPROC(_set_dram_srfs)
 227
 228 ENTRY(_unset_dram_srfs)
 229         /*  set the dram out of self refresh mode */
 230
 231 #if defined(EBIU_RSTCTL)        /* DDR */
 232         P0.H = hi(EBIU_RSTCTL);
 233         P0.L = lo(EBIU_RSTCTL);
 234         R2 = [P0];
 235         BITCLR(R2, 3); /* clear SRREQ bit */
 236         [P0] = R2;
 237 #elif defined(EBIU_SDGCTL)      /* SDRAM */
 238         /* release CLKOUT from self-refresh */
 239         P0.L = lo(EBIU_SDGCTL);
 240         P0.H = hi(EBIU_SDGCTL);
 241
 242         R2 = [P0];
 243         BITSET(R2, 0); /* SCTLE enable CLKOUT */
 244         [P0] = R2
 245         SSYNC;
 246
 247         /* release SDRAM from self-refresh */
 248         R2 = [P0];
 249         BITCLR(R2, 24); /* clear SRFS bit */
 250         [P0] = R2
 251 #endif
 252
 253         SSYNC;
 254         RTS;
 255 ENDPROC(_unset_dram_srfs)
 256
 257 ENTRY(_set_sic_iwr)
 258 #ifdef SIC_IWR0
 259         P0.H = hi(SYSMMR_BASE);
 260         P0.L = lo(SYSMMR_BASE);
 261         [P0 + (SIC_IWR0 - SYSMMR_BASE)] = R0;
 262         [P0 + (SIC_IWR1 - SYSMMR_BASE)] = R1;
 263 # ifdef SIC_IWR2
 264         [P0 + (SIC_IWR2 - SYSMMR_BASE)] = R2;
 265 # endif
 266 #else
 267         P0.H = hi(SIC_IWR);
 268         P0.L = lo(SIC_IWR);
 269         [P0] = R0;
 270 #endif
 271
 272         SSYNC;
 273         RTS;
 274 ENDPROC(_set_sic_iwr)
 275
 276 ENTRY(_test_pll_locked)
 277         P0.H = hi(PLL_STAT);
 278         P0.L = lo(PLL_STAT);
 279 1:
 280         R0 = W[P0] (Z);
 281         CC = BITTST(R0,5);
 282         IF !CC JUMP 1b;
 283         RTS;
 284 ENDPROC(_test_pll_locked)
 285
 286 .section .text
 287 ENTRY(_do_hibernate)
 288         bfin_cpu_reg_save;
 289         bfin_sys_mmr_save;
 290         bfin_core_mmr_save;
 291
 292         /* Setup args to hibernate mode early for pipeline optimization */
 293         R0 = M3;
 294         P1.H = _hibernate_mode;
 295         P1.L = _hibernate_mode;
 296
 297         /* Save Magic, return address and Stack Pointer */
 298         P0 = 0;
 299         R1.H = 0xDEAD;  /* Hibernate Magic */
 300         R1.L = 0xBEEF;
 301         R2.H = .Lpm_resume_here;
 302         R2.L = .Lpm_resume_here;
 303         [P0++] = R1;    /* Store Hibernate Magic */
 304         [P0++] = R2;    /* Save Return Address */
 305         [P0++] = SP;    /* Save Stack Pointer */
 306
 307         /* Must use an indirect call as we need to jump to L1 */
 308         call (P1); /* Goodbye */
 309
 310 .Lpm_resume_here:
 311
 312         bfin_core_mmr_restore;
 313         bfin_sys_mmr_restore;
 314         bfin_cpu_reg_restore;
 315
 316         [--sp] = RETI;  /* Clear Global Interrupt Disable */
 317         SP += 4;
 318
 319         RTS;
 320 ENDPROC(_do_hibernate)