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>

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;
 }

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

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

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? */