sh: Rework SuperH Mobile sleep mode code

Rework the SuperH Mobile sleep code from including
board specific code to allowing each board to provide
pre/post code snippets. These snippets should contain
sdram management code to enter and leave self-refresh.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 91 insertions, 153 deletions

diff --git a/arch/sh/kernel/cpu/shmobile/sleep.S b/arch/sh/kernel/cpu/shmobile/sleep.S
index a439e6c7824f..d3221d9b88be 100644
--- a/arch/sh/kernel/cpu/shmobile/sleep.S
+++ b/arch/sh/kernel/cpu/shmobile/sleep.S
@@ -20,79 +20,49 @@
  * Kernel mode register usage, see entry.S:
  *      k0      scratch
  *      k1      scratch
- *      k4      scratch
  */
 #define k0      r0
 #define k1      r1
-#define k4      r4
 
-/* manage self-refresh and enter standby mode.
+/* manage self-refresh and enter standby mode. must be self-contained.
  * this code will be copied to on-chip memory and executed from there.
  */
+        .balign 4
+ENTRY(sh_mobile_sleep_enter_start)
 
-        .balign         4096,0,4096
-ENTRY(sh_mobile_standby)
+        /* save mode flags */
+        mov.l   r4, @(SH_SLEEP_MODE, r5)
 
         /* save original vbr */
-        stc     vbr, r1
-        mova    saved_vbr, r0
-        mov.l   r1, @r0
+        stc     vbr, r0
+        mov.l   r0, @(SH_SLEEP_VBR, r5)
 
         /* point vbr to our on-chip memory page */
         ldc     r5, vbr
 
         /* save return address */
-        mova    saved_spc, r0
-        sts     pr, r5
-        mov.l   r5, @r0
+        sts     pr, r0
+        mov.l   r0, @(SH_SLEEP_SPC, r5)
 
         /* save sr */
-        mova    saved_sr, r0
-        stc     sr, r5
-        mov.l   r5, @r0
+        stc     sr, r0
+        mov.l   r0, @(SH_SLEEP_SR, r5)
 
-        /* save mode flags */
-        mova    saved_mode, r0
-        mov.l   r4, @r0
-
-        /* put mode flags in r0 */
-        mov     r4, r0
+        /* save stbcr */
+        bsr     save_register
+         mov    #SH_SLEEP_REG_STBCR, r0
 
+        /* call self-refresh entering code if needed */
+        mov.l   @(SH_SLEEP_MODE, r5), r0
         tst     #SUSP_SH_SF, r0
         bt      skip_set_sf
-#ifdef CONFIG_CPU_SUBTYPE_SH7724
-        /* DBSC: put memory in self-refresh mode */
-        mov.l   dben_reg, r4
-        mov.l   dben_data0, r1
-        mov.l   r1, @r4
-
-        mov.l   dbrfpdn0_reg, r4
-        mov.l   dbrfpdn0_data0, r1
-        mov.l   r1, @r4
-
-        mov.l   dbcmdcnt_reg, r4
-        mov.l   dbcmdcnt_data0, r1
-        mov.l   r1, @r4
-
-        mov.l   dbcmdcnt_reg, r4
-        mov.l   dbcmdcnt_data1, r1
-        mov.l   r1, @r4
-
-        mov.l   dbrfpdn0_reg, r4
-        mov.l   dbrfpdn0_data1, r1
-        mov.l   r1, @r4
-#else
-        /* SBSC: disable power down and put in self-refresh mode */
-        mov.l   1f, r4
-        mov.l   2f, r1
-        mov.l   @r4, r2
-        or      r1, r2
-        mov.l   3f, r3
-        and     r3, r2
-        mov.l   r2, @r4
-#endif
+
+        mov.l   @(SH_SLEEP_SF_PRE, r5), r0
+        jsr     @r0
+         nop
 
 skip_set_sf:
+        mov.l   @(SH_SLEEP_MODE, r5), r0
         tst     #SUSP_SH_STANDBY, r0
         bt      test_rstandby
 
@@ -123,124 +93,92 @@ force_sleep:
 
 do_sleep:
         /* setup and enter selected standby mode */
-        mov.l   5f, r4
-        mov.l   r1, @r4
+        bsr     get_register
+         mov    #SH_SLEEP_REG_STBCR, r0
+        mov.l   r1, @r0
 again:
         sleep
         bra     again
          nop
 
-restore_jump_vbr:
+save_register:
+        add     #SH_SLEEP_BASE_ADDR, r0
+        mov.l   @(r0, r5), r1
+        add     #-SH_SLEEP_BASE_ADDR, r0
+        mov.l   @r1, r1
+        add     #SH_SLEEP_BASE_DATA, r0
+        mov.l   r1, @(r0, r5)
+        add     #-SH_SLEEP_BASE_DATA, r0
+        rts
+         nop
+
+get_register:
+        add     #SH_SLEEP_BASE_ADDR, r0
+        mov.l   @(r0, r5), r0
+        rts
+         nop
+ENTRY(sh_mobile_sleep_enter_end)
+
+        .balign 4
+ENTRY(sh_mobile_sleep_resume_start)
+
+        /* figure out start address */
+        bsr     0f
+         nop
+0:
+        sts     pr, k1
+        mov.l   1f, k0
+        and     k0, k1
+
+        /* store pointer to data area in VBR */
+        ldc     k1, vbr
+
+        /* setup sr with saved sr */
+        mov.l   @(SH_SLEEP_SR, k1), k0
+        ldc     k0, sr
+
+        /* now: user register set! */
+        stc     vbr, r5
+
         /* setup spc with return address to c code */
-        mov.l   saved_spc, k0
-        ldc     k0, spc
+        mov.l   @(SH_SLEEP_SPC, r5), r0
+        ldc     r0, spc
 
         /* restore vbr */
-        mov.l   saved_vbr, k0
-        ldc     k0, vbr
+        mov.l   @(SH_SLEEP_VBR, r5), r0
+        ldc     r0, vbr
 
         /* setup ssr with saved sr */
-        mov.l   saved_sr, k0
-        ldc     k0, ssr
-
-        /* get mode flags */
-        mov.l   saved_mode, k0
+        mov.l   @(SH_SLEEP_SR, r5), r0
+        ldc     r0, ssr
 
-done_sleep:
-        /* reset standby mode to sleep mode */
-        mov.l   5f, k4
-        mov     #0x00, k1
-        mov.l   k1, @k4
+        /* restore sleep mode register */
+        bsr     restore_register
+         mov    #SH_SLEEP_REG_STBCR, r0
 
-        tst     #SUSP_SH_SF, k0
+        /* call self-refresh resume code if needed */
+        mov.l   @(SH_SLEEP_MODE, r5), r0
+        tst     #SUSP_SH_SF, r0
         bt      skip_restore_sf
 
-#ifdef CONFIG_CPU_SUBTYPE_SH7724
-        /* DBSC: put memory in auto-refresh mode */
-        mov.l   dbrfpdn0_reg, k4
-        mov.l   dbrfpdn0_data0, k1
-        mov.l   k1, @k4
-
-        nop /* sleep 140 ns */
-        nop
-        nop
-        nop
-
-        mov.l   dbcmdcnt_reg, k4
-        mov.l   dbcmdcnt_data0, k1
-        mov.l   k1, @k4
-
-        mov.l   dbcmdcnt_reg, k4
-        mov.l   dbcmdcnt_data1, k1
-        mov.l   k1, @k4
-
-        mov.l   dben_reg, k4
-        mov.l   dben_data1, k1
-        mov.l   k1, @k4
-
-        mov.l   dbrfpdn0_reg, k4
-        mov.l   dbrfpdn0_data2, k1
-        mov.l   k1, @k4
-#else
-        /* SBSC: set auto-refresh mode */
-        mov.l   1f, k4
-        mov.l   @k4, k0
-        mov.l   4f, k1
-        and     k1, k0
-        mov.l   k0, @k4
-        mov.l   6f, k4
-        mov.l   8f, k0
-        mov.l   @k4, k1
-        mov     #-1, k4
-        add     k4, k1
-        or      k1, k0
-        mov.l   7f, k1
-        mov.l   k0, @k1
-#endif
+        mov.l   @(SH_SLEEP_SF_POST, r5), r0
+        jsr     @r0
+         nop
+
 skip_restore_sf:
-        /* jump to vbr vector */
-        mov.l   saved_vbr, k0
-        mov.l   offset_vbr, k4
-        add     k4, k0
-        jmp     @k0
+        rte
          nop
 
-        .balign 4
-saved_mode:     .long   0
-saved_spc:      .long   0
-saved_sr:       .long   0
-saved_vbr:      .long   0
-offset_vbr:     .long   0x600
-#ifdef CONFIG_CPU_SUBTYPE_SH7724
-dben_reg:       .long   0xfd000010 /* DBEN */
-dben_data0:     .long   0
-dben_data1:     .long   1
-dbrfpdn0_reg:   .long   0xfd000040 /* DBRFPDN0 */
-dbrfpdn0_data0: .long   0
-dbrfpdn0_data1: .long   1
-dbrfpdn0_data2: .long   0x00010000
-dbcmdcnt_reg:   .long   0xfd000014 /* DBCMDCNT */
-dbcmdcnt_data0: .long   2
-dbcmdcnt_data1: .long   4
-#else
-1:      .long   0xfe400008 /* SDCR0 */
-2:      .long   0x00000400
-3:      .long   0xffff7fff
-4:      .long   0xfffffbff
-#endif
-5:      .long   0xa4150020 /* STBCR */
-6:      .long   0xfe40001c /* RTCOR */
-7:      .long   0xfe400018 /* RTCNT */
-8:      .long   0xa55a0000
-
-
-/* interrupt vector @ 0x600 */
-        .balign         0x400,0,0x400
-        .long   0xdeadbeef
-        .balign         0x200,0,0x200
-        bra     restore_jump_vbr
+restore_register:
+        add     #SH_SLEEP_BASE_DATA, r0
+        mov.l   @(r0, r5), r1
+        add     #-SH_SLEEP_BASE_DATA, r0
+        add     #SH_SLEEP_BASE_ADDR, r0
+        mov.l   @(r0, r5), r0
+        mov.l   r1, @r0
+        rts
          nop
-sh_mobile_standby_end:
 
-ENTRY(sh_mobile_standby_size)
-        .long sh_mobile_standby_end - sh_mobile_standby
+        .balign 4
+1:      .long   ~0x7ff
+ENTRY(sh_mobile_sleep_resume_end)