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/*
* Copyright 2004-2008 Analog Devices Inc.
*
* Licensed under the GPL-2 or later.
*/
#include <linux/linkage.h>
#include <asm/blackfin.h>
#include <mach/irq.h>
#include <asm/dpmc.h>
.section .l1.text
ENTRY(_sleep_mode)
[--SP] = (R7:4, P5:3);
[--SP] = RETS;
call _set_sic_iwr;
P0.H = hi(PLL_CTL);
P0.L = lo(PLL_CTL);
R1 = W[P0](z);
BITSET (R1, 3);
W[P0] = R1.L;
CLI R2;
SSYNC;
IDLE;
STI R2;
call _test_pll_locked;
R0 = IWR_ENABLE(0);
R1 = IWR_DISABLE_ALL;
R2 = IWR_DISABLE_ALL;
call _set_sic_iwr;
P0.H = hi(PLL_CTL);
P0.L = lo(PLL_CTL);
R7 = w[p0](z);
BITCLR (R7, 3);
BITCLR (R7, 5);
w[p0] = R7.L;
IDLE;
call _test_pll_locked;
RETS = [SP++];
(R7:4, P5:3) = [SP++];
RTS;
ENDPROC(_sleep_mode)
/*
* This func never returns as it puts the part into hibernate, and
* is only called from do_hibernate, so we don't bother saving or
* restoring any of the normal C runtime state. When we wake up,
* the entry point will be in do_hibernate and not here.
*
* We accept just one argument -- the value to write to VR_CTL.
*/
ENTRY(_hibernate_mode)
/* Save/setup the regs we need early for minor pipeline optimization */
R4 = R0;
P3.H = hi(VR_CTL);
P3.L = lo(VR_CTL);
/* Disable all wakeup sources */
R0 = IWR_DISABLE_ALL;
R1 = IWR_DISABLE_ALL;
R2 = IWR_DISABLE_ALL;
call _set_sic_iwr;
call _set_dram_srfs;
SSYNC;
/* Finally, we climb into our cave to hibernate */
W[P3] = R4.L;
CLI R2;
IDLE;
.Lforever:
jump .Lforever;
ENDPROC(_hibernate_mode)
ENTRY(_sleep_deeper)
[--SP] = (R7:4, P5:3);
[--SP] = RETS;
CLI R4;
P3 = R0;
P4 = R1;
P5 = R2;
R0 = IWR_ENABLE(0);
R1 = IWR_DISABLE_ALL;
R2 = IWR_DISABLE_ALL;
call _set_sic_iwr;
call _set_dram_srfs; /* Set SDRAM Self Refresh */
P0.H = hi(PLL_DIV);
P0.L = lo(PLL_DIV);
R6 = W[P0](z);
R0.L = 0xF;
W[P0] = R0.l; /* Set Max VCO to SCLK divider */
P0.H = hi(PLL_CTL);
P0.L = lo(PLL_CTL);
R5 = W[P0](z);
R0.L = (CONFIG_MIN_VCO_HZ/CONFIG_CLKIN_HZ) << 9;
W[P0] = R0.l; /* Set Min CLKIN to VCO multiplier */
SSYNC;
IDLE;
call _test_pll_locked;
P0.H = hi(VR_CTL);
P0.L = lo(VR_CTL);
R7 = W[P0](z);
R1 = 0x6;
R1 <<= 16;
R2 = 0x0404(Z);
R1 = R1|R2;
R2 = DEPOSIT(R7, R1);
W[P0] = R2; /* Set Min Core Voltage */
SSYNC;
IDLE;
call _test_pll_locked;
R0 = P3;
R1 = P4;
R3 = P5;
call _set_sic_iwr; /* Set Awake from IDLE */
P0.H = hi(PLL_CTL);
P0.L = lo(PLL_CTL);
R0 = W[P0](z);
BITSET (R0, 3);
W[P0] = R0.L; /* Turn CCLK OFF */
SSYNC;
IDLE;
call _test_pll_locked;
R0 = IWR_ENABLE(0);
R1 = IWR_DISABLE_ALL;
R2 = IWR_DISABLE_ALL;
call _set_sic_iwr; /* Set Awake from IDLE PLL */
P0.H = hi(VR_CTL);
P0.L = lo(VR_CTL);
W[P0]= R7;
SSYNC;
IDLE;
call _test_pll_locked;
P0.H = hi(PLL_DIV);
P0.L = lo(PLL_DIV);
W[P0]= R6; /* Restore CCLK and SCLK divider */
P0.H = hi(PLL_CTL);
P0.L = lo(PLL_CTL);
w[p0] = R5; /* Restore VCO multiplier */
IDLE;
call _test_pll_locked;
call _unset_dram_srfs; /* SDRAM Self Refresh Off */
STI R4;
RETS = [SP++];
(R7:4, P5:3) = [SP++];
RTS;
ENDPROC(_sleep_deeper)
ENTRY(_set_dram_srfs)
/* set the dram to self refresh mode */
SSYNC;
#if defined(EBIU_RSTCTL) /* DDR */
P0.H = hi(EBIU_RSTCTL);
P0.L = lo(EBIU_RSTCTL);
R2 = [P0];
BITSET(R2, 3); /* SRREQ enter self-refresh mode */
[P0] = R2;
SSYNC;
1:
R2 = [P0];
CC = BITTST(R2, 4);
if !CC JUMP 1b;
#else /* SDRAM */
P0.L = lo(EBIU_SDGCTL);
P0.H = hi(EBIU_SDGCTL);
P1.L = lo(EBIU_SDSTAT);
P1.H = hi(EBIU_SDSTAT);
R2 = [P0];
BITSET(R2, 24); /* SRFS enter self-refresh mode */
[P0] = R2;
SSYNC;
1:
R2 = w[P1];
SSYNC;
cc = BITTST(R2, 1); /* SDSRA poll self-refresh status */
if !cc jump 1b;
R2 = [P0];
BITCLR(R2, 0); /* SCTLE disable CLKOUT */
[P0] = R2;
#endif
RTS;
ENDPROC(_set_dram_srfs)
ENTRY(_unset_dram_srfs)
/* set the dram out of self refresh mode */
#if defined(EBIU_RSTCTL) /* DDR */
P0.H = hi(EBIU_RSTCTL);
P0.L = lo(EBIU_RSTCTL);
R2 = [P0];
BITCLR(R2, 3); /* clear SRREQ bit */
[P0] = R2;
#elif defined(EBIU_SDGCTL) /* SDRAM */
/* release CLKOUT from self-refresh */
P0.L = lo(EBIU_SDGCTL);
P0.H = hi(EBIU_SDGCTL);
R2 = [P0];
BITSET(R2, 0); /* SCTLE enable CLKOUT */
[P0] = R2
SSYNC;
/* release SDRAM from self-refresh */
R2 = [P0];
BITCLR(R2, 24); /* clear SRFS bit */
[P0] = R2
#endif
SSYNC;
RTS;
ENDPROC(_unset_dram_srfs)
ENTRY(_set_sic_iwr)
#ifdef SIC_IWR0
P0.H = hi(SYSMMR_BASE);
P0.L = lo(SYSMMR_BASE);
[P0 + (SIC_IWR0 - SYSMMR_BASE)] = R0;
[P0 + (SIC_IWR1 - SYSMMR_BASE)] = R1;
# ifdef SIC_IWR2
[P0 + (SIC_IWR2 - SYSMMR_BASE)] = R2;
# endif
#else
P0.H = hi(SIC_IWR);
P0.L = lo(SIC_IWR);
[P0] = R0;
#endif
SSYNC;
RTS;
ENDPROC(_set_sic_iwr)
ENTRY(_test_pll_locked)
P0.H = hi(PLL_STAT);
P0.L = lo(PLL_STAT);
1:
R0 = W[P0] (Z);
CC = BITTST(R0,5);
IF !CC JUMP 1b;
RTS;
ENDPROC(_test_pll_locked)
.section .text
ENTRY(_do_hibernate)
bfin_cpu_reg_save;
bfin_sys_mmr_save;
bfin_core_mmr_save;
/* Setup args to hibernate mode early for pipeline optimization */
R0 = M3;
P1.H = _hibernate_mode;
P1.L = _hibernate_mode;
/* Save Magic, return address and Stack Pointer */
P0 = 0;
R1.H = 0xDEAD; /* Hibernate Magic */
R1.L = 0xBEEF;
R2.H = .Lpm_resume_here;
R2.L = .Lpm_resume_here;
[P0++] = R1; /* Store Hibernate Magic */
[P0++] = R2; /* Save Return Address */
[P0++] = SP; /* Save Stack Pointer */
/* Must use an indirect call as we need to jump to L1 */
call (P1); /* Goodbye */
.Lpm_resume_here:
bfin_core_mmr_restore;
bfin_sys_mmr_restore;
bfin_cpu_reg_restore;
[--sp] = RETI; /* Clear Global Interrupt Disable */
SP += 4;
RTS;
ENDPROC(_do_hibernate)
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