ARM: OMAP3: clock: remove un-used core dpll re-program code

Remove the OMAP3 core DPLL re-program code, and the associated SRAM
code that does the low-level programming of the DPLL divider, idling
of the SDRAM etc.

This code was never fully implemented in the kernel; things missing
were driver side handling of core clock changes (they need to account
for their functional clock rate being changed on-the-fly), and the whole
framework required for handling this. Thus, there is not much point
to keep carrying the low-level support code either.
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Cc: Paul Walmsley <paul@pwsan.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/mach-omap2/Makefile

@@ -48,11 +48,9 @@ AFLAGS_sleep44xx.o			:=-Wa,-march=armv7-a$(plus_sec)
 # Functions loaded to SRAM
 obj-$(CONFIG_SOC_OMAP2420)		+= sram242x.o
 obj-$(CONFIG_SOC_OMAP2430)		+= sram243x.o
-obj-$(CONFIG_ARCH_OMAP3)		+= sram34xx.o
 
 AFLAGS_sram242x.o			:=-Wa,-march=armv6
 AFLAGS_sram243x.o			:=-Wa,-march=armv6
-AFLAGS_sram34xx.o			:=-Wa,-march=armv7-a
 
 # Restart code (OMAP4/5 currently in omap4-common.c)
 obj-$(CONFIG_SOC_OMAP2420)		+= omap2-restart.o
@@ -186,7 +184,6 @@ obj-$(CONFIG_ARCH_OMAP2)		+= clkt2xxx_dpllcore.o
 obj-$(CONFIG_ARCH_OMAP2)		+= clkt2xxx_virt_prcm_set.o
 obj-$(CONFIG_ARCH_OMAP2)		+= clkt2xxx_dpll.o
 obj-$(CONFIG_ARCH_OMAP3)		+= $(clock-common)
-obj-$(CONFIG_ARCH_OMAP3)		+= clkt34xx_dpll3m2.o
 obj-$(CONFIG_ARCH_OMAP4)		+= $(clock-common)
 obj-$(CONFIG_SOC_AM33XX)		+= $(clock-common)
 obj-$(CONFIG_SOC_OMAP5)			+= $(clock-common)

arch/arm/mach-omap2/clkt34xx_dpll3m2.c

-/*
- * OMAP34xx M2 divider clock code
- *
- * Copyright (C) 2007-2008 Texas Instruments, Inc.
- * Copyright (C) 2007-2010 Nokia Corporation
- *
- * Paul Walmsley
- * Jouni Högander
- *
- * Parts of this code are based on code written by
- * Richard Woodruff, Tony Lindgren, Tuukka Tikkanen, Karthik Dasu
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-#undef DEBUG
-
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/clk.h>
-#include <linux/io.h>
-
-#include "clock.h"
-#include "clock3xxx.h"
-#include "sdrc.h"
-#include "sram.h"
-
-#define CYCLES_PER_MHZ			1000000
-
-struct clk *sdrc_ick_p, *arm_fck_p;
-
-/*
- * CORE DPLL (DPLL3) M2 divider rate programming functions
- *
- * These call into SRAM code to do the actual CM writes, since the SDRAM
- * is clocked from DPLL3.
- */
-
-/**
- * omap3_core_dpll_m2_set_rate - set CORE DPLL M2 divider
- * @clk: struct clk * of DPLL to set
- * @rate: rounded target rate
- *
- * Program the DPLL M2 divider with the rounded target rate.  Returns
- * -EINVAL upon error, or 0 upon success.
- */
-int omap3_core_dpll_m2_set_rate(struct clk_hw *hw, unsigned long rate,
-					unsigned long parent_rate)
-{
-	struct clk_hw_omap *clk = to_clk_hw_omap(hw);
-	u32 new_div = 0;
-	u32 unlock_dll = 0;
-	u32 c;
-	unsigned long validrate, sdrcrate, _mpurate;
-	struct omap_sdrc_params *sdrc_cs0;
-	struct omap_sdrc_params *sdrc_cs1;
-	int ret;
-	unsigned long clkrate;
-
-	if (!clk || !rate)
-		return -EINVAL;
-
-	new_div = DIV_ROUND_UP(parent_rate, rate);
-	validrate = parent_rate / new_div;
-
-	if (validrate != rate)
-		return -EINVAL;
-
-	sdrcrate = clk_get_rate(sdrc_ick_p);
-	clkrate = clk_hw_get_rate(hw);
-	if (rate > clkrate)
-		sdrcrate <<= ((rate / clkrate) >> 1);
-	else
-		sdrcrate >>= ((clkrate / rate) >> 1);
-
-	ret = omap2_sdrc_get_params(sdrcrate, &sdrc_cs0, &sdrc_cs1);
-	if (ret)
-		return -EINVAL;
-
-	if (sdrcrate < MIN_SDRC_DLL_LOCK_FREQ) {
-		pr_debug("clock: will unlock SDRC DLL\n");
-		unlock_dll = 1;
-	}
-
-	/*
-	 * XXX This only needs to be done when the CPU frequency changes
-	 */
-	_mpurate = clk_get_rate(arm_fck_p) / CYCLES_PER_MHZ;
-	c = (_mpurate << SDRC_MPURATE_SCALE) >> SDRC_MPURATE_BASE_SHIFT;
-	c += 1;  /* for safety */
-	c *= SDRC_MPURATE_LOOPS;
-	c >>= SDRC_MPURATE_SCALE;
-	if (c == 0)
-		c = 1;
-
-	pr_debug("clock: changing CORE DPLL rate from %lu to %lu\n",
-		 clkrate, validrate);
-	pr_debug("clock: SDRC CS0 timing params used: RFR %08x CTRLA %08x CTRLB %08x MR %08x\n",
-		 sdrc_cs0->rfr_ctrl, sdrc_cs0->actim_ctrla,
-		 sdrc_cs0->actim_ctrlb, sdrc_cs0->mr);
-	if (sdrc_cs1)
-		pr_debug("clock: SDRC CS1 timing params used: RFR %08x CTRLA %08x CTRLB %08x MR %08x\n",
-			 sdrc_cs1->rfr_ctrl, sdrc_cs1->actim_ctrla,
-			 sdrc_cs1->actim_ctrlb, sdrc_cs1->mr);
-
-	if (sdrc_cs1)
-		omap3_configure_core_dpll(
-				  new_div, unlock_dll, c, rate > clkrate,
-				  sdrc_cs0->rfr_ctrl, sdrc_cs0->actim_ctrla,
-				  sdrc_cs0->actim_ctrlb, sdrc_cs0->mr,
-				  sdrc_cs1->rfr_ctrl, sdrc_cs1->actim_ctrla,
-				  sdrc_cs1->actim_ctrlb, sdrc_cs1->mr);
-	else
-		omap3_configure_core_dpll(
-				  new_div, unlock_dll, c, rate > clkrate,
-				  sdrc_cs0->rfr_ctrl, sdrc_cs0->actim_ctrla,
-				  sdrc_cs0->actim_ctrlb, sdrc_cs0->mr,
-				  0, 0, 0, 0);
-	return 0;
-}
-

arch/arm/mach-omap2/sram.c

@@ -211,35 +211,10 @@ static inline int omap243x_sram_init(void)
 
 #ifdef CONFIG_ARCH_OMAP3
 
-static u32 (*_omap3_sram_configure_core_dpll)(
-			u32 m2, u32 unlock_dll, u32 f, u32 inc,
-			u32 sdrc_rfr_ctrl_0, u32 sdrc_actim_ctrl_a_0,
-			u32 sdrc_actim_ctrl_b_0, u32 sdrc_mr_0,
-			u32 sdrc_rfr_ctrl_1, u32 sdrc_actim_ctrl_a_1,
-			u32 sdrc_actim_ctrl_b_1, u32 sdrc_mr_1);
-
-u32 omap3_configure_core_dpll(u32 m2, u32 unlock_dll, u32 f, u32 inc,
-			u32 sdrc_rfr_ctrl_0, u32 sdrc_actim_ctrl_a_0,
-			u32 sdrc_actim_ctrl_b_0, u32 sdrc_mr_0,
-			u32 sdrc_rfr_ctrl_1, u32 sdrc_actim_ctrl_a_1,
-			u32 sdrc_actim_ctrl_b_1, u32 sdrc_mr_1)
-{
-	BUG_ON(!_omap3_sram_configure_core_dpll);
-	return _omap3_sram_configure_core_dpll(
-			m2, unlock_dll, f, inc,
-			sdrc_rfr_ctrl_0, sdrc_actim_ctrl_a_0,
-			sdrc_actim_ctrl_b_0, sdrc_mr_0,
-			sdrc_rfr_ctrl_1, sdrc_actim_ctrl_a_1,
-			sdrc_actim_ctrl_b_1, sdrc_mr_1);
-}
-
 void omap3_sram_restore_context(void)
 {
 	omap_sram_reset();
 
-	_omap3_sram_configure_core_dpll =
-		omap_sram_push(omap3_sram_configure_core_dpll,
-			       omap3_sram_configure_core_dpll_sz);
 	omap_push_sram_idle();
 }
 

arch/arm/mach-omap2/sram.h

@@ -15,12 +15,6 @@ extern void omap2_sram_reprogram_sdrc(u32 perf_level, u32 dll_val,
 				      u32 mem_type);
 extern u32 omap2_set_prcm(u32 dpll_ctrl_val, u32 sdrc_rfr_val, int bypass);
 
-extern u32 omap3_configure_core_dpll(
-			u32 m2, u32 unlock_dll, u32 f, u32 inc,
-			u32 sdrc_rfr_ctrl_0, u32 sdrc_actim_ctrl_a_0,
-			u32 sdrc_actim_ctrl_b_0, u32 sdrc_mr_0,
-			u32 sdrc_rfr_ctrl_1, u32 sdrc_actim_ctrl_a_1,
-			u32 sdrc_actim_ctrl_b_1, u32 sdrc_mr_1);
 extern void omap3_sram_restore_context(void);
 
 /* Do not use these */
@@ -52,14 +46,6 @@ extern void omap243x_sram_reprogram_sdrc(u32 perf_level, u32 dll_val,
 						u32 mem_type);
 extern unsigned long omap243x_sram_reprogram_sdrc_sz;
 
-extern u32 omap3_sram_configure_core_dpll(
-			u32 m2, u32 unlock_dll, u32 f, u32 inc,
-			u32 sdrc_rfr_ctrl_0, u32 sdrc_actim_ctrl_a_0,
-			u32 sdrc_actim_ctrl_b_0, u32 sdrc_mr_0,
-			u32 sdrc_rfr_ctrl_1, u32 sdrc_actim_ctrl_a_1,
-			u32 sdrc_actim_ctrl_b_1, u32 sdrc_mr_1);
-extern unsigned long omap3_sram_configure_core_dpll_sz;
-
 #ifdef CONFIG_PM
 extern void omap_push_sram_idle(void);
 #else