arch/arm/mach-omap2/clkt2xxx_virt_prcm_set.c - maze/linux - Git at Google

 /*
  * OMAP2xxx DVFS virtual clock functions
  *
  * Copyright (C) 2005-2008 Texas Instruments, Inc.
  * Copyright (C) 2004-2010 Nokia Corporation
  *
  * Contacts:
  * Richard Woodruff <r-woodruff2@ti.com>
  * Paul Walmsley
  *
  * Based on earlier work by Tuukka Tikkanen, Tony Lindgren,
  * Gordon McNutt and RidgeRun, Inc.
  *
  * 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.
  *
  * XXX Some of this code should be replaceable by the upcoming OPP layer
  * code.  However, some notion of "rate set" is probably still necessary
  * for OMAP2xxx at least.  Rate sets should be generalized so they can be
  * used for any OMAP chip, not just OMAP2xxx.  In particular, Richard Woodruff
  * has in the past expressed a preference to use rate sets for OPP changes,
  * rather than dynamically recalculating the clock tree, so if someone wants
  * this badly enough to write the code to handle it, we should support it
  * as an option.
  */
 #undef DEBUG

 #include <linux/kernel.h>
 #include <linux/errno.h>
 #include <linux/clk.h>
 #include <linux/io.h>
 #include <linux/cpufreq.h>
 #include <linux/slab.h>

 #include <plat/clock.h>
 #include <plat/sram.h>
 #include <plat/sdrc.h>

 #include "clock.h"
 #include "clock2xxx.h"
 #include "opp2xxx.h"
 #include "cm.h"
 #include "cm-regbits-24xx.h"

 const struct prcm_config *curr_prcm_set;
 const struct prcm_config *rate_table;

 /**
  * omap2_table_mpu_recalc - just return the MPU speed
  * @clk: virt_prcm_set struct clk
  *
  * Set virt_prcm_set's rate to the mpu_speed field of the current PRCM set.
  */
 unsigned long omap2_table_mpu_recalc(struct clk *clk)
 {
 	return curr_prcm_set->mpu_speed;
 }

 /*
  * Look for a rate equal or less than the target rate given a configuration set.
  *
  * What's not entirely clear is "which" field represents the key field.
  * Some might argue L3-DDR, others ARM, others IVA. This code is simple and
  * just uses the ARM rates.
  */
 long omap2_round_to_table_rate(struct clk *clk, unsigned long rate)
 {
 	const struct prcm_config *ptr;
 	long highest_rate;

 	highest_rate = -EINVAL;

 	for (ptr = rate_table; ptr->mpu_speed; ptr++) {
 		if (!(ptr->flags & cpu_mask))
 			continue;
 		if (ptr->xtal_speed != sclk->rate)
 			continue;

 		highest_rate = ptr->mpu_speed;

 		/* Can check only after xtal frequency check */
 		if (ptr->mpu_speed <= rate)
 			break;
 	}
 	return highest_rate;
 }

 /* Sets basic clocks based on the specified rate */
 int omap2_select_table_rate(struct clk *clk, unsigned long rate)
 {
 	u32 cur_rate, done_rate, bypass = 0, tmp;
 	const struct prcm_config *prcm;
 	unsigned long found_speed = 0;
 	unsigned long flags;

 	for (prcm = rate_table; prcm->mpu_speed; prcm++) {
 		if (!(prcm->flags & cpu_mask))
 			continue;

 		if (prcm->xtal_speed != sclk->rate)
 			continue;

 		if (prcm->mpu_speed <= rate) {
 			found_speed = prcm->mpu_speed;
 			break;
 		}
 	}

 	if (!found_speed) {
 		printk(KERN_INFO "Could not set MPU rate to %luMHz\n",
 		       rate / 1000000);
 		return -EINVAL;
 	}

 	curr_prcm_set = prcm;
 	cur_rate = omap2xxx_clk_get_core_rate(dclk);

 	if (prcm->dpll_speed == cur_rate / 2) {
 		omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL, 1);
 	} else if (prcm->dpll_speed == cur_rate * 2) {
 		omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL_X2, 1);
 	} else if (prcm->dpll_speed != cur_rate) {
 		local_irq_save(flags);

 		if (prcm->dpll_speed == prcm->xtal_speed)
 			bypass = 1;

 		if ((prcm->cm_clksel2_pll & OMAP24XX_CORE_CLK_SRC_MASK) ==
 		    CORE_CLK_SRC_DPLL_X2)
 			done_rate = CORE_CLK_SRC_DPLL_X2;
 		else
 			done_rate = CORE_CLK_SRC_DPLL;

 		/* MPU divider */
 		cm_write_mod_reg(prcm->cm_clksel_mpu, MPU_MOD, CM_CLKSEL);

 		/* dsp + iva1 div(2420), iva2.1(2430) */
 		cm_write_mod_reg(prcm->cm_clksel_dsp,
 				 OMAP24XX_DSP_MOD, CM_CLKSEL);

 		cm_write_mod_reg(prcm->cm_clksel_gfx, GFX_MOD, CM_CLKSEL);

 		/* Major subsystem dividers */
 		tmp = cm_read_mod_reg(CORE_MOD, CM_CLKSEL1) & OMAP24XX_CLKSEL_DSS2_MASK;
 		cm_write_mod_reg(prcm->cm_clksel1_core | tmp, CORE_MOD,
 				 CM_CLKSEL1);

 		if (cpu_is_omap2430())
 			cm_write_mod_reg(prcm->cm_clksel_mdm,
 					 OMAP2430_MDM_MOD, CM_CLKSEL);

 		/* x2 to enter omap2xxx_sdrc_init_params() */
 		omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL_X2, 1);

 		omap2_set_prcm(prcm->cm_clksel1_pll, prcm->base_sdrc_rfr,
 			       bypass);

 		omap2xxx_sdrc_init_params(omap2xxx_sdrc_dll_is_unlocked());
 		omap2xxx_sdrc_reprogram(done_rate, 0);

 		local_irq_restore(flags);
 	}

 	return 0;
 }

 #ifdef CONFIG_CPU_FREQ
 /*
  * Walk PRCM rate table and fillout cpufreq freq_table
  * XXX This should be replaced by an OPP layer in the near future
  */
 static struct cpufreq_frequency_table *freq_table;

 void omap2_clk_init_cpufreq_table(struct cpufreq_frequency_table **table)
 {
 	const struct prcm_config *prcm;
 	int i = 0;
 	int tbl_sz = 0;

 	if (!cpu_is_omap24xx())
 		return;

 	for (prcm = rate_table; prcm->mpu_speed; prcm++) {
 		if (!(prcm->flags & cpu_mask))
 			continue;
 		if (prcm->xtal_speed != sclk->rate)
 			continue;

 		/* don't put bypass rates in table */
 		if (prcm->dpll_speed == prcm->xtal_speed)
 			continue;

 		tbl_sz++;
 	}

 	/*
 	 * XXX Ensure that we're doing what CPUFreq expects for this error
 	 * case and the following one
 	 */
 	if (tbl_sz == 0) {
 		pr_warning("%s: no matching entries in rate_table\n",
 			   __func__);
 		return;
 	}

 	/* Include the CPUFREQ_TABLE_END terminator entry */
 	tbl_sz++;

 	freq_table = kzalloc(sizeof(struct cpufreq_frequency_table) * tbl_sz,
 			     GFP_ATOMIC);
 	if (!freq_table) {
 		pr_err("%s: could not kzalloc frequency table\n", __func__);
 		return;
 	}

 	for (prcm = rate_table; prcm->mpu_speed; prcm++) {
 		if (!(prcm->flags & cpu_mask))
 			continue;
 		if (prcm->xtal_speed != sclk->rate)
 			continue;

 		/* don't put bypass rates in table */
 		if (prcm->dpll_speed == prcm->xtal_speed)
 			continue;

 		freq_table[i].index = i;
 		freq_table[i].frequency = prcm->mpu_speed / 1000;
 		i++;
 	}

 	freq_table[i].index = i;
 	freq_table[i].frequency = CPUFREQ_TABLE_END;

 	*table = &freq_table[0];
 }

 void omap2_clk_exit_cpufreq_table(struct cpufreq_frequency_table **table)
 {
 	if (!cpu_is_omap24xx())
 		return;

 	kfree(freq_table);
 }

 #endif
	/*
	* OMAP2xxx DVFS virtual clock functions
	*
	* Copyright (C) 2005-2008 Texas Instruments, Inc.
	* Copyright (C) 2004-2010 Nokia Corporation
	*
	* Contacts:
	* Richard Woodruff <r-woodruff2@ti.com>
	* Paul Walmsley
	*
	* Based on earlier work by Tuukka Tikkanen, Tony Lindgren,
	* Gordon McNutt and RidgeRun, Inc.
	*
	* 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.
	*
	* XXX Some of this code should be replaceable by the upcoming OPP layer
	* code. However, some notion of "rate set" is probably still necessary
	* for OMAP2xxx at least. Rate sets should be generalized so they can be
	* used for any OMAP chip, not just OMAP2xxx. In particular, Richard Woodruff
	* has in the past expressed a preference to use rate sets for OPP changes,
	* rather than dynamically recalculating the clock tree, so if someone wants
	* this badly enough to write the code to handle it, we should support it
	* as an option.
	*/
	#undef DEBUG

	#include <linux/kernel.h>
	#include <linux/errno.h>
	#include <linux/clk.h>
	#include <linux/io.h>
	#include <linux/cpufreq.h>
	#include <linux/slab.h>

	#include <plat/clock.h>
	#include <plat/sram.h>
	#include <plat/sdrc.h>

	#include "clock.h"
	#include "clock2xxx.h"
	#include "opp2xxx.h"
	#include "cm.h"
	#include "cm-regbits-24xx.h"

	const struct prcm_config *curr_prcm_set;
	const struct prcm_config *rate_table;

	/**
	* omap2_table_mpu_recalc - just return the MPU speed
	* @clk: virt_prcm_set struct clk
	*
	* Set virt_prcm_set's rate to the mpu_speed field of the current PRCM set.
	*/
	unsigned long omap2_table_mpu_recalc(struct clk *clk)
	{
	return curr_prcm_set->mpu_speed;
	}

	/*
	* Look for a rate equal or less than the target rate given a configuration set.
	*
	* What's not entirely clear is "which" field represents the key field.
	* Some might argue L3-DDR, others ARM, others IVA. This code is simple and
	* just uses the ARM rates.
	*/
	long omap2_round_to_table_rate(struct clk *clk, unsigned long rate)
	{
	const struct prcm_config *ptr;
	long highest_rate;

	highest_rate = -EINVAL;

	for (ptr = rate_table; ptr->mpu_speed; ptr++) {
	if (!(ptr->flags & cpu_mask))
	continue;
	if (ptr->xtal_speed != sclk->rate)
	continue;

	highest_rate = ptr->mpu_speed;

	/* Can check only after xtal frequency check */
	if (ptr->mpu_speed <= rate)
	break;
	}
	return highest_rate;
	}

	/* Sets basic clocks based on the specified rate */
	int omap2_select_table_rate(struct clk *clk, unsigned long rate)
	{
	u32 cur_rate, done_rate, bypass = 0, tmp;
	const struct prcm_config *prcm;
	unsigned long found_speed = 0;
	unsigned long flags;

	for (prcm = rate_table; prcm->mpu_speed; prcm++) {
	if (!(prcm->flags & cpu_mask))
	continue;

	if (prcm->xtal_speed != sclk->rate)
	continue;

	if (prcm->mpu_speed <= rate) {
	found_speed = prcm->mpu_speed;
	break;
	}
	}

	if (!found_speed) {
	printk(KERN_INFO "Could not set MPU rate to %luMHz\n",
	rate / 1000000);
	return -EINVAL;
	}

	curr_prcm_set = prcm;
	cur_rate = omap2xxx_clk_get_core_rate(dclk);

	if (prcm->dpll_speed == cur_rate / 2) {
	omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL, 1);
	} else if (prcm->dpll_speed == cur_rate * 2) {
	omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL_X2, 1);
	} else if (prcm->dpll_speed != cur_rate) {
	local_irq_save(flags);

	if (prcm->dpll_speed == prcm->xtal_speed)
	bypass = 1;

	if ((prcm->cm_clksel2_pll & OMAP24XX_CORE_CLK_SRC_MASK) ==
	CORE_CLK_SRC_DPLL_X2)
	done_rate = CORE_CLK_SRC_DPLL_X2;
	else
	done_rate = CORE_CLK_SRC_DPLL;

	/* MPU divider */
	cm_write_mod_reg(prcm->cm_clksel_mpu, MPU_MOD, CM_CLKSEL);

	/* dsp + iva1 div(2420), iva2.1(2430) */
	cm_write_mod_reg(prcm->cm_clksel_dsp,
	OMAP24XX_DSP_MOD, CM_CLKSEL);

	cm_write_mod_reg(prcm->cm_clksel_gfx, GFX_MOD, CM_CLKSEL);

	/* Major subsystem dividers */
	tmp = cm_read_mod_reg(CORE_MOD, CM_CLKSEL1) & OMAP24XX_CLKSEL_DSS2_MASK;
	cm_write_mod_reg(prcm->cm_clksel1_core \| tmp, CORE_MOD,
	CM_CLKSEL1);

	if (cpu_is_omap2430())
	cm_write_mod_reg(prcm->cm_clksel_mdm,
	OMAP2430_MDM_MOD, CM_CLKSEL);

	/* x2 to enter omap2xxx_sdrc_init_params() */
	omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL_X2, 1);

	omap2_set_prcm(prcm->cm_clksel1_pll, prcm->base_sdrc_rfr,
	bypass);

	omap2xxx_sdrc_init_params(omap2xxx_sdrc_dll_is_unlocked());
	omap2xxx_sdrc_reprogram(done_rate, 0);

	local_irq_restore(flags);
	}

	return 0;
	}

	#ifdef CONFIG_CPU_FREQ
	/*
	* Walk PRCM rate table and fillout cpufreq freq_table
	* XXX This should be replaced by an OPP layer in the near future
	*/
	static struct cpufreq_frequency_table *freq_table;

	void omap2_clk_init_cpufreq_table(struct cpufreq_frequency_table **table)
	{
	const struct prcm_config *prcm;
	int i = 0;
	int tbl_sz = 0;

	if (!cpu_is_omap24xx())
	return;

	for (prcm = rate_table; prcm->mpu_speed; prcm++) {
	if (!(prcm->flags & cpu_mask))
	continue;
	if (prcm->xtal_speed != sclk->rate)
	continue;

	/* don't put bypass rates in table */
	if (prcm->dpll_speed == prcm->xtal_speed)
	continue;

	tbl_sz++;
	}

	/*
	* XXX Ensure that we're doing what CPUFreq expects for this error
	* case and the following one
	*/
	if (tbl_sz == 0) {
	pr_warning("%s: no matching entries in rate_table\n",
	__func__);
	return;
	}

	/* Include the CPUFREQ_TABLE_END terminator entry */
	tbl_sz++;

	freq_table = kzalloc(sizeof(struct cpufreq_frequency_table) * tbl_sz,
	GFP_ATOMIC);
	if (!freq_table) {
	pr_err("%s: could not kzalloc frequency table\n", __func__);
	return;
	}

	for (prcm = rate_table; prcm->mpu_speed; prcm++) {
	if (!(prcm->flags & cpu_mask))
	continue;
	if (prcm->xtal_speed != sclk->rate)
	continue;

	/* don't put bypass rates in table */
	if (prcm->dpll_speed == prcm->xtal_speed)
	continue;

	freq_table[i].index = i;
	freq_table[i].frequency = prcm->mpu_speed / 1000;
	i++;
	}

	freq_table[i].index = i;
	freq_table[i].frequency = CPUFREQ_TABLE_END;

	*table = &freq_table[0];
	}

	void omap2_clk_exit_cpufreq_table(struct cpufreq_frequency_table **table)
	{
	if (!cpu_is_omap24xx())
	return;

	kfree(freq_table);
	}

	#endif