cpufreq: pxa2xx: move cpufreq driver to drivers/cpufreq

This patch moves cpufreq driver of ARM based pxa2xx platform to drivers/cpufreq.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Eric Miao <eric.y.miao@gmail.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 0 insertions, 493 deletions

diff --git a/arch/arm/mach-pxa/cpufreq-pxa2xx.c b/arch/arm/mach-pxa/cpufreq-pxa2xx.c
deleted file mode 100644
index f1ca4daa1ad6..000000000000
--- a/arch/arm/mach-pxa/cpufreq-pxa2xx.c
+++ /dev/null
@@ -1,493 +0,0 @@
-/*
- *  linux/arch/arm/mach-pxa/cpufreq-pxa2xx.c
- *
- *  Copyright (C) 2002,2003 Intrinsyc Software
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
- *
- * History:
- *   31-Jul-2002 : Initial version [FB]
- *   29-Jan-2003 : added PXA255 support [FB]
- *   20-Apr-2003 : ported to v2.5 (Dustin McIntire, Sensoria Corp.)
- *
- * Note:
- *   This driver may change the memory bus clock rate, but will not do any
- *   platform specific access timing changes... for example if you have flash
- *   memory connected to CS0, you will need to register a platform specific
- *   notifier which will adjust the memory access strobes to maintain a
- *   minimum strobe width.
- *
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/sched.h>
-#include <linux/init.h>
-#include <linux/cpufreq.h>
-#include <linux/err.h>
-#include <linux/regulator/consumer.h>
-#include <linux/io.h>
-
-#include <mach/pxa2xx-regs.h>
-#include <mach/smemc.h>
-
-#ifdef DEBUG
-static unsigned int freq_debug;
-module_param(freq_debug, uint, 0);
-MODULE_PARM_DESC(freq_debug, "Set the debug messages to on=1/off=0");
-#else
-#define freq_debug  0
-#endif
-
-static struct regulator *vcc_core;
-
-static unsigned int pxa27x_maxfreq;
-module_param(pxa27x_maxfreq, uint, 0);
-MODULE_PARM_DESC(pxa27x_maxfreq, "Set the pxa27x maxfreq in MHz"
-		 "(typically 624=>pxa270, 416=>pxa271, 520=>pxa272)");
-
-typedef struct {
-	unsigned int khz;
-	unsigned int membus;
-	unsigned int cccr;
-	unsigned int div2;
-	unsigned int cclkcfg;
-	int vmin;
-	int vmax;
-} pxa_freqs_t;
-
-/* Define the refresh period in mSec for the SDRAM and the number of rows */
-#define SDRAM_TREF	64	/* standard 64ms SDRAM */
-static unsigned int sdram_rows;
-
-#define CCLKCFG_TURBO		0x1
-#define CCLKCFG_FCS		0x2
-#define CCLKCFG_HALFTURBO	0x4
-#define CCLKCFG_FASTBUS		0x8
-#define MDREFR_DB2_MASK		(MDREFR_K2DB2 | MDREFR_K1DB2)
-#define MDREFR_DRI_MASK		0xFFF
-
-#define MDCNFG_DRAC2(mdcnfg) (((mdcnfg) >> 21) & 0x3)
-#define MDCNFG_DRAC0(mdcnfg) (((mdcnfg) >> 5) & 0x3)
-
-/*
- * PXA255 definitions
- */
-/* Use the run mode frequencies for the CPUFREQ_POLICY_PERFORMANCE policy */
-#define CCLKCFG			CCLKCFG_TURBO | CCLKCFG_FCS
-
-static pxa_freqs_t pxa255_run_freqs[] =
-{
-	/* CPU   MEMBUS  CCCR  DIV2 CCLKCFG	           run  turbo PXbus SDRAM */
-	{ 99500,  99500, 0x121, 1,  CCLKCFG, -1, -1},	/*  99,   99,   50,   50  */
-	{132700, 132700, 0x123, 1,  CCLKCFG, -1, -1},	/* 133,  133,   66,   66  */
-	{199100,  99500, 0x141, 0,  CCLKCFG, -1, -1},	/* 199,  199,   99,   99  */
-	{265400, 132700, 0x143, 1,  CCLKCFG, -1, -1},	/* 265,  265,  133,   66  */
-	{331800, 165900, 0x145, 1,  CCLKCFG, -1, -1},	/* 331,  331,  166,   83  */
-	{398100,  99500, 0x161, 0,  CCLKCFG, -1, -1},	/* 398,  398,  196,   99  */
-};
-
-/* Use the turbo mode frequencies for the CPUFREQ_POLICY_POWERSAVE policy */
-static pxa_freqs_t pxa255_turbo_freqs[] =
-{
-	/* CPU   MEMBUS  CCCR  DIV2 CCLKCFG	   run  turbo PXbus SDRAM */
-	{ 99500, 99500,  0x121, 1,  CCLKCFG, -1, -1},	/*  99,   99,   50,   50  */
-	{199100, 99500,  0x221, 0,  CCLKCFG, -1, -1},	/*  99,  199,   50,   99  */
-	{298500, 99500,  0x321, 0,  CCLKCFG, -1, -1},	/*  99,  287,   50,   99  */
-	{298600, 99500,  0x1c1, 0,  CCLKCFG, -1, -1},	/* 199,  287,   99,   99  */
-	{398100, 99500,  0x241, 0,  CCLKCFG, -1, -1},	/* 199,  398,   99,   99  */
-};
-
-#define NUM_PXA25x_RUN_FREQS ARRAY_SIZE(pxa255_run_freqs)
-#define NUM_PXA25x_TURBO_FREQS ARRAY_SIZE(pxa255_turbo_freqs)
-
-static struct cpufreq_frequency_table
-	pxa255_run_freq_table[NUM_PXA25x_RUN_FREQS+1];
-static struct cpufreq_frequency_table
-	pxa255_turbo_freq_table[NUM_PXA25x_TURBO_FREQS+1];
-
-static unsigned int pxa255_turbo_table;
-module_param(pxa255_turbo_table, uint, 0);
-MODULE_PARM_DESC(pxa255_turbo_table, "Selects the frequency table (0 = run table, !0 = turbo table)");
-
-/*
- * PXA270 definitions
- *
- * For the PXA27x:
- * Control variables are A, L, 2N for CCCR; B, HT, T for CLKCFG.
- *
- * A = 0 => memory controller clock from table 3-7,
- * A = 1 => memory controller clock = system bus clock
- * Run mode frequency	= 13 MHz * L
- * Turbo mode frequency = 13 MHz * L * N
- * System bus frequency = 13 MHz * L / (B + 1)
- *
- * In CCCR:
- * A = 1
- * L = 16	  oscillator to run mode ratio
- * 2N = 6	  2 * (turbo mode to run mode ratio)
- *
- * In CCLKCFG:
- * B = 1	  Fast bus mode
- * HT = 0	  Half-Turbo mode
- * T = 1	  Turbo mode
- *
- * For now, just support some of the combinations in table 3-7 of
- * PXA27x Processor Family Developer's Manual to simplify frequency
- * change sequences.
- */
-#define PXA27x_CCCR(A, L, N2) (A << 25 | N2 << 7 | L)
-#define CCLKCFG2(B, HT, T) \
-  (CCLKCFG_FCS | \
-   ((B)  ? CCLKCFG_FASTBUS : 0) | \
-   ((HT) ? CCLKCFG_HALFTURBO : 0) | \
-   ((T)  ? CCLKCFG_TURBO : 0))
-
-static pxa_freqs_t pxa27x_freqs[] = {
-	{104000, 104000, PXA27x_CCCR(1,	 8, 2), 0, CCLKCFG2(1, 0, 1),  900000, 1705000 },
-	{156000, 104000, PXA27x_CCCR(1,	 8, 3), 0, CCLKCFG2(1, 0, 1), 1000000, 1705000 },
-	{208000, 208000, PXA27x_CCCR(0, 16, 2), 1, CCLKCFG2(0, 0, 1), 1180000, 1705000 },
-	{312000, 208000, PXA27x_CCCR(1, 16, 3), 1, CCLKCFG2(1, 0, 1), 1250000, 1705000 },
-	{416000, 208000, PXA27x_CCCR(1, 16, 4), 1, CCLKCFG2(1, 0, 1), 1350000, 1705000 },
-	{520000, 208000, PXA27x_CCCR(1, 16, 5), 1, CCLKCFG2(1, 0, 1), 1450000, 1705000 },
-	{624000, 208000, PXA27x_CCCR(1, 16, 6), 1, CCLKCFG2(1, 0, 1), 1550000, 1705000 }
-};
-
-#define NUM_PXA27x_FREQS ARRAY_SIZE(pxa27x_freqs)
-static struct cpufreq_frequency_table
-	pxa27x_freq_table[NUM_PXA27x_FREQS+1];
-
-extern unsigned get_clk_frequency_khz(int info);
-
-#ifdef CONFIG_REGULATOR
-
-static int pxa_cpufreq_change_voltage(pxa_freqs_t *pxa_freq)
-{
-	int ret = 0;
-	int vmin, vmax;
-
-	if (!cpu_is_pxa27x())
-		return 0;
-
-	vmin = pxa_freq->vmin;
-	vmax = pxa_freq->vmax;
-	if ((vmin == -1) || (vmax == -1))
-		return 0;
-
-	ret = regulator_set_voltage(vcc_core, vmin, vmax);
-	if (ret)
-		pr_err("cpufreq: Failed to set vcc_core in [%dmV..%dmV]\n",
-		       vmin, vmax);
-	return ret;
-}
-
-static __init void pxa_cpufreq_init_voltages(void)
-{
-	vcc_core = regulator_get(NULL, "vcc_core");
-	if (IS_ERR(vcc_core)) {
-		pr_info("cpufreq: Didn't find vcc_core regulator\n");
-		vcc_core = NULL;
-	} else {
-		pr_info("cpufreq: Found vcc_core regulator\n");
-	}
-}
-#else
-static int pxa_cpufreq_change_voltage(pxa_freqs_t *pxa_freq)
-{
-	return 0;
-}
-
-static __init void pxa_cpufreq_init_voltages(void) { }
-#endif
-
-static void find_freq_tables(struct cpufreq_frequency_table **freq_table,
-			     pxa_freqs_t **pxa_freqs)
-{
-	if (cpu_is_pxa25x()) {
-		if (!pxa255_turbo_table) {
-			*pxa_freqs = pxa255_run_freqs;
-			*freq_table = pxa255_run_freq_table;
-		} else {
-			*pxa_freqs = pxa255_turbo_freqs;
-			*freq_table = pxa255_turbo_freq_table;
-		}
-	}
-	if (cpu_is_pxa27x()) {
-		*pxa_freqs = pxa27x_freqs;
-		*freq_table = pxa27x_freq_table;
-	}
-}
-
-static void pxa27x_guess_max_freq(void)
-{
-	if (!pxa27x_maxfreq) {
-		pxa27x_maxfreq = 416000;
-		printk(KERN_INFO "PXA CPU 27x max frequency not defined "
-		       "(pxa27x_maxfreq), assuming pxa271 with %dkHz maxfreq\n",
-		       pxa27x_maxfreq);
-	} else {
-		pxa27x_maxfreq *= 1000;
-	}
-}
-
-static void init_sdram_rows(void)
-{
-	uint32_t mdcnfg = __raw_readl(MDCNFG);
-	unsigned int drac2 = 0, drac0 = 0;
-
-	if (mdcnfg & (MDCNFG_DE2 | MDCNFG_DE3))
-		drac2 = MDCNFG_DRAC2(mdcnfg);
-
-	if (mdcnfg & (MDCNFG_DE0 | MDCNFG_DE1))
-		drac0 = MDCNFG_DRAC0(mdcnfg);
-
-	sdram_rows = 1 << (11 + max(drac0, drac2));
-}
-
-static u32 mdrefr_dri(unsigned int freq)
-{
-	u32 interval = freq * SDRAM_TREF / sdram_rows;
-
-	return (interval - (cpu_is_pxa27x() ? 31 : 0)) / 32;
-}
-
-/* find a valid frequency point */
-static int pxa_verify_policy(struct cpufreq_policy *policy)
-{
-	struct cpufreq_frequency_table *pxa_freqs_table;
-	pxa_freqs_t *pxa_freqs;
-	int ret;
-
-	find_freq_tables(&pxa_freqs_table, &pxa_freqs);
-	ret = cpufreq_frequency_table_verify(policy, pxa_freqs_table);
-
-	if (freq_debug)
-		pr_debug("Verified CPU policy: %dKhz min to %dKhz max\n",
-			 policy->min, policy->max);
-
-	return ret;
-}
-
-static unsigned int pxa_cpufreq_get(unsigned int cpu)
-{
-	return get_clk_frequency_khz(0);
-}
-
-static int pxa_set_target(struct cpufreq_policy *policy,
-			  unsigned int target_freq,
-			  unsigned int relation)
-{
-	struct cpufreq_frequency_table *pxa_freqs_table;
-	pxa_freqs_t *pxa_freq_settings;
-	struct cpufreq_freqs freqs;
-	unsigned int idx;
-	unsigned long flags;
-	unsigned int new_freq_cpu, new_freq_mem;
-	unsigned int unused, preset_mdrefr, postset_mdrefr, cclkcfg;
-	int ret = 0;
-
-	/* Get the current policy */
-	find_freq_tables(&pxa_freqs_table, &pxa_freq_settings);
-
-	/* Lookup the next frequency */
-	if (cpufreq_frequency_table_target(policy, pxa_freqs_table,
-					   target_freq, relation, &idx)) {
-		return -EINVAL;
-	}
-
-	new_freq_cpu = pxa_freq_settings[idx].khz;
-	new_freq_mem = pxa_freq_settings[idx].membus;
-	freqs.old = policy->cur;
-	freqs.new = new_freq_cpu;
-
-	if (freq_debug)
-		pr_debug("Changing CPU frequency to %d Mhz, (SDRAM %d Mhz)\n",
-			 freqs.new / 1000, (pxa_freq_settings[idx].div2) ?
-			 (new_freq_mem / 2000) : (new_freq_mem / 1000));
-
-	if (vcc_core && freqs.new > freqs.old)
-		ret = pxa_cpufreq_change_voltage(&pxa_freq_settings[idx]);
-	if (ret)
-		return ret;
-	/*
-	 * Tell everyone what we're about to do...
-	 * you should add a notify client with any platform specific
-	 * Vcc changing capability
-	 */
-	cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
-
-	/* Calculate the next MDREFR.  If we're slowing down the SDRAM clock
-	 * we need to preset the smaller DRI before the change.	 If we're
-	 * speeding up we need to set the larger DRI value after the change.
-	 */
-	preset_mdrefr = postset_mdrefr = __raw_readl(MDREFR);
-	if ((preset_mdrefr & MDREFR_DRI_MASK) > mdrefr_dri(new_freq_mem)) {
-		preset_mdrefr = (preset_mdrefr & ~MDREFR_DRI_MASK);
-		preset_mdrefr |= mdrefr_dri(new_freq_mem);
-	}
-	postset_mdrefr =
-		(postset_mdrefr & ~MDREFR_DRI_MASK) | mdrefr_dri(new_freq_mem);
-
-	/* If we're dividing the memory clock by two for the SDRAM clock, this
-	 * must be set prior to the change.  Clearing the divide must be done
-	 * after the change.
-	 */
-	if (pxa_freq_settings[idx].div2) {
-		preset_mdrefr  |= MDREFR_DB2_MASK;
-		postset_mdrefr |= MDREFR_DB2_MASK;
-	} else {
-		postset_mdrefr &= ~MDREFR_DB2_MASK;
-	}
-
-	local_irq_save(flags);
-
-	/* Set new the CCCR and prepare CCLKCFG */
-	CCCR = pxa_freq_settings[idx].cccr;
-	cclkcfg = pxa_freq_settings[idx].cclkcfg;
-
-	asm volatile("							\n\
-		ldr	r4, [%1]		/* load MDREFR */	\n\
-		b	2f						\n\
-		.align	5						\n\
-1:									\n\
-		str	%3, [%1]		/* preset the MDREFR */	\n\
-		mcr	p14, 0, %2, c6, c0, 0	/* set CCLKCFG[FCS] */	\n\
-		str	%4, [%1]		/* postset the MDREFR */ \n\
-									\n\
-		b	3f						\n\
-2:		b	1b						\n\
-3:		nop							\n\
-	  "
-		     : "=&r" (unused)
-		     : "r" (MDREFR), "r" (cclkcfg),
-		       "r" (preset_mdrefr), "r" (postset_mdrefr)
-		     : "r4", "r5");
-	local_irq_restore(flags);
-
-	/*
-	 * Tell everyone what we've just done...
-	 * you should add a notify client with any platform specific
-	 * SDRAM refresh timer adjustments
-	 */
-	cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
-
-	/*
-	 * Even if voltage setting fails, we don't report it, as the frequency
-	 * change succeeded. The voltage reduction is not a critical failure,
-	 * only power savings will suffer from this.
-	 *
-	 * Note: if the voltage change fails, and a return value is returned, a
-	 * bug is triggered (seems a deadlock). Should anybody find out where,
-	 * the "return 0" should become a "return ret".
-	 */
-	if (vcc_core && freqs.new < freqs.old)
-		ret = pxa_cpufreq_change_voltage(&pxa_freq_settings[idx]);
-
-	return 0;
-}
-
-static int pxa_cpufreq_init(struct cpufreq_policy *policy)
-{
-	int i;
-	unsigned int freq;
-	struct cpufreq_frequency_table *pxa255_freq_table;
-	pxa_freqs_t *pxa255_freqs;
-
-	/* try to guess pxa27x cpu */
-	if (cpu_is_pxa27x())
-		pxa27x_guess_max_freq();
-
-	pxa_cpufreq_init_voltages();
-
-	init_sdram_rows();
-
-	/* set default policy and cpuinfo */
-	policy->cpuinfo.transition_latency = 1000; /* FIXME: 1 ms, assumed */
-	policy->cur = get_clk_frequency_khz(0);	   /* current freq */
-	policy->min = policy->max = policy->cur;
-
-	/* Generate pxa25x the run cpufreq_frequency_table struct */
-	for (i = 0; i < NUM_PXA25x_RUN_FREQS; i++) {
-		pxa255_run_freq_table[i].frequency = pxa255_run_freqs[i].khz;
-		pxa255_run_freq_table[i].index = i;
-	}
-	pxa255_run_freq_table[i].frequency = CPUFREQ_TABLE_END;
-
-	/* Generate pxa25x the turbo cpufreq_frequency_table struct */
-	for (i = 0; i < NUM_PXA25x_TURBO_FREQS; i++) {
-		pxa255_turbo_freq_table[i].frequency =
-			pxa255_turbo_freqs[i].khz;
-		pxa255_turbo_freq_table[i].index = i;
-	}
-	pxa255_turbo_freq_table[i].frequency = CPUFREQ_TABLE_END;
-
-	pxa255_turbo_table = !!pxa255_turbo_table;
-
-	/* Generate the pxa27x cpufreq_frequency_table struct */
-	for (i = 0; i < NUM_PXA27x_FREQS; i++) {
-		freq = pxa27x_freqs[i].khz;
-		if (freq > pxa27x_maxfreq)
-			break;
-		pxa27x_freq_table[i].frequency = freq;
-		pxa27x_freq_table[i].index = i;
-	}
-	pxa27x_freq_table[i].index = i;
-	pxa27x_freq_table[i].frequency = CPUFREQ_TABLE_END;
-
-	/*
-	 * Set the policy's minimum and maximum frequencies from the tables
-	 * just constructed.  This sets cpuinfo.mxx_freq, min and max.
-	 */
-	if (cpu_is_pxa25x()) {
-		find_freq_tables(&pxa255_freq_table, &pxa255_freqs);
-		pr_info("PXA255 cpufreq using %s frequency table\n",
-			pxa255_turbo_table ? "turbo" : "run");
-		cpufreq_frequency_table_cpuinfo(policy, pxa255_freq_table);
-	}
-	else if (cpu_is_pxa27x())
-		cpufreq_frequency_table_cpuinfo(policy, pxa27x_freq_table);
-
-	printk(KERN_INFO "PXA CPU frequency change support initialized\n");
-
-	return 0;
-}
-
-static struct cpufreq_driver pxa_cpufreq_driver = {
-	.verify	= pxa_verify_policy,
-	.target	= pxa_set_target,
-	.init	= pxa_cpufreq_init,
-	.get	= pxa_cpufreq_get,
-	.name	= "PXA2xx",
-};
-
-static int __init pxa_cpu_init(void)
-{
-	int ret = -ENODEV;
-	if (cpu_is_pxa25x() || cpu_is_pxa27x())
-		ret = cpufreq_register_driver(&pxa_cpufreq_driver);
-	return ret;
-}
-
-static void __exit pxa_cpu_exit(void)
-{
-	cpufreq_unregister_driver(&pxa_cpufreq_driver);
-}
-
-
-MODULE_AUTHOR("Intrinsyc Software Inc.");
-MODULE_DESCRIPTION("CPU frequency changing driver for the PXA architecture");
-MODULE_LICENSE("GPL");
-module_init(pxa_cpu_init);
-module_exit(pxa_cpu_exit);