OMAP3: Add support for DPLL3 divisor values higher than 2

Previously only 1 and 2 was supported. This is needed for DVFS VDD2 control.

Signed-off-by: Tero Kristo <tero.kristo@nokia.com>

4 files changed, 15 insertions, 14 deletions

diff --git a/arch/arm/mach-omap2/clock34xx.c b/arch/arm/mach-omap2/clock34xx.c
index cf41ab55fa97..045da923e75b 100644
--- a/arch/arm/mach-omap2/clock34xx.c
+++ b/arch/arm/mach-omap2/clock34xx.c
@@ -739,9 +739,9 @@ static int omap3_core_dpll_m2_set_rate(struct clk *clk, unsigned long rate)
 
         sdrcrate = sdrc_ick.rate;
         if (rate > clk->rate)
-                sdrcrate <<= ((rate / clk->rate) - 1);
+                sdrcrate <<= ((rate / clk->rate) >> 1);
         else
-                sdrcrate >>= ((clk->rate / rate) - 1);
+                sdrcrate >>= ((clk->rate / rate) >> 1);
 
         sp = omap2_sdrc_get_params(sdrcrate);
         if (!sp)
@@ -768,12 +768,9 @@ static int omap3_core_dpll_m2_set_rate(struct clk *clk, unsigned long rate)
         pr_debug("clock: SDRC timing params used: %08x %08x %08x\n",
                  sp->rfr_ctrl, sp->actim_ctrla, sp->actim_ctrlb);
 
-        /* REVISIT: SRAM code doesn't support other M2 divisors yet */
-        WARN_ON(new_div != 1 && new_div != 2);
-
         omap3_configure_core_dpll(sp->rfr_ctrl, sp->actim_ctrla,
                                   sp->actim_ctrlb, new_div, unlock_dll, c,
-                                  sp->mr);
+                                  sp->mr, rate > clk->rate);
 
         return 0;
 }
diff --git a/arch/arm/mach-omap2/sram34xx.S b/arch/arm/mach-omap2/sram34xx.S
index 16eb4efa8b74..487fa8609cde 100644
--- a/arch/arm/mach-omap2/sram34xx.S
+++ b/arch/arm/mach-omap2/sram34xx.S
@@ -70,6 +70,7 @@
  * r5 = number of MPU cycles to wait for SDRC to stabilize after
  *      reprogramming the SDRC when switching to a slower MPU speed
  * r6 = new SDRC_MR_0 register value
+ * r7 = increasing SDRC rate? (1 = yes, 0 = no)
  *
  */
 ENTRY(omap3_sram_configure_core_dpll)
@@ -77,9 +78,10 @@ ENTRY(omap3_sram_configure_core_dpll)
         ldr     r4, [sp, #52]           @ pull extra args off the stack
         ldr     r5, [sp, #56]           @ load extra args from the stack
         ldr     r6, [sp, #60]           @ load extra args from the stack
+        ldr     r7, [sp, #64]           @ load extra args from the stack
         dsb                             @ flush buffered writes to interconnect
-        cmp     r3, #0x2                @ if increasing SDRC clk rate,
-        blne    configure_sdrc          @ program the SDRC regs early (for RFR)
+        cmp     r7, #1                  @ if increasing SDRC clk rate,
+        bleq    configure_sdrc          @ program the SDRC regs early (for RFR)
         cmp     r4, #SDRC_UNLOCK_DLL    @ set the intended DLL state
         bleq    unlock_dll
         blne    lock_dll
@@ -89,7 +91,7 @@ ENTRY(omap3_sram_configure_core_dpll)
         cmp     r4, #SDRC_UNLOCK_DLL    @ wait for DLL status to change
         bleq    wait_dll_unlock
         blne    wait_dll_lock
-        cmp     r3, #0x1                @ if increasing SDRC clk rate,
+        cmp     r7, #1                  @ if increasing SDRC clk rate,
         beq     return_to_sdram         @ return to SDRAM code, otherwise,
         bl      configure_sdrc          @ reprogram SDRC regs now
         mov     r12, r5
diff --git a/arch/arm/plat-omap/include/mach/sram.h b/arch/arm/plat-omap/include/mach/sram.h
index 4f87056a3677..4d53cc59d7a3 100644
--- a/arch/arm/plat-omap/include/mach/sram.h
+++ b/arch/arm/plat-omap/include/mach/sram.h
@@ -24,7 +24,8 @@ extern u32 omap2_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass);
 extern u32 omap3_configure_core_dpll(u32 sdrc_rfr_ctrl,
                                      u32 sdrc_actim_ctrla,
                                      u32 sdrc_actim_ctrlb, u32 m2,
-                                     u32 unlock_dll, u32 f, u32 sdrc_mr);
+                                     u32 unlock_dll, u32 f, u32 sdrc_mr,
+                                     u32 inc);
 
 /* Do not use these */
 extern void omap1_sram_reprogram_clock(u32 ckctl, u32 dpllctl);
@@ -62,7 +63,8 @@ extern unsigned long omap243x_sram_reprogram_sdrc_sz;
 extern u32 omap3_sram_configure_core_dpll(u32 sdrc_rfr_ctrl,
                                           u32 sdrc_actim_ctrla,
                                           u32 sdrc_actim_ctrlb, u32 m2,
-                                          u32 unlock_dll, u32 f, u32 sdrc_mr);
+                                          u32 unlock_dll, u32 f, u32 sdrc_mr,
+                                          u32 inc);
 extern unsigned long omap3_sram_configure_core_dpll_sz;
 
 #endif
diff --git a/arch/arm/plat-omap/sram.c b/arch/arm/plat-omap/sram.c
index 7dadf1a59fb5..65006df3f1b7 100644
--- a/arch/arm/plat-omap/sram.c
+++ b/arch/arm/plat-omap/sram.c
@@ -372,16 +372,16 @@ static u32 (*_omap3_sram_configure_core_dpll)(u32 sdrc_rfr_ctrl,
                                               u32 sdrc_actim_ctrla,
                                               u32 sdrc_actim_ctrlb,
                                               u32 m2, u32 unlock_dll,
-                                              u32 f, u32 sdrc_mr);
+                                              u32 f, u32 sdrc_mr, u32 inc);
 u32 omap3_configure_core_dpll(u32 sdrc_rfr_ctrl, u32 sdrc_actim_ctrla,
                               u32 sdrc_actim_ctrlb, u32 m2, u32 unlock_dll,
-                              u32 f, u32 sdrc_mr)
+                              u32 f, u32 sdrc_mr, u32 inc)
 {
         BUG_ON(!_omap3_sram_configure_core_dpll);
         return _omap3_sram_configure_core_dpll(sdrc_rfr_ctrl,
                                                sdrc_actim_ctrla,
                                                sdrc_actim_ctrlb, m2,
-                                               unlock_dll, f, sdrc_mr);
+                                               unlock_dll, f, sdrc_mr, inc);
 }
 
 /* REVISIT: Should this be same as omap34xx_sram_init() after off-idle? */