cpufreq: sa11x0: move cpufreq driver to drivers/cpufreq

This patch moves cpufreq driver of ARM based sa11x0 platform to drivers/cpufreq.

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

1 files changed, 0 insertions, 407 deletions

diff --git a/arch/arm/mach-sa1100/cpu-sa1110.c b/arch/arm/mach-sa1100/cpu-sa1110.c
deleted file mode 100644
index 38a77330dc16..000000000000
--- a/arch/arm/mach-sa1100/cpu-sa1110.c
+++ /dev/null
@@ -1,407 +0,0 @@
-/*
- *  linux/arch/arm/mach-sa1100/cpu-sa1110.c
- *
- *  Copyright (C) 2001 Russell King
- *
- * 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.
- *
- * Note: there are two erratas that apply to the SA1110 here:
- *  7 - SDRAM auto-power-up failure (rev A0)
- * 13 - Corruption of internal register reads/writes following
- *      SDRAM reads (rev A0, B0, B1)
- *
- * We ignore rev. A0 and B0 devices; I don't think they're worth supporting.
- *
- * The SDRAM type can be passed on the command line as cpu_sa1110.sdram=type
- */
-#include <linux/cpufreq.h>
-#include <linux/delay.h>
-#include <linux/init.h>
-#include <linux/io.h>
-#include <linux/kernel.h>
-#include <linux/moduleparam.h>
-#include <linux/types.h>
-
-#include <asm/cputype.h>
-#include <asm/mach-types.h>
-
-#include <mach/hardware.h>
-
-#include "generic.h"
-
-#undef DEBUG
-
-struct sdram_params {
-	const char name[20];
-	u_char  rows;		/* bits				 */
-	u_char  cas_latency;	/* cycles			 */
-	u_char  tck;		/* clock cycle time (ns)	 */
-	u_char  trcd;		/* activate to r/w (ns)		 */
-	u_char  trp;		/* precharge to activate (ns)	 */
-	u_char  twr;		/* write recovery time (ns)	 */
-	u_short refresh;	/* refresh time for array (us)	 */
-};
-
-struct sdram_info {
-	u_int	mdcnfg;
-	u_int	mdrefr;
-	u_int	mdcas[3];
-};
-
-static struct sdram_params sdram_tbl[] __initdata = {
-	{	/* Toshiba TC59SM716 CL2 */
-		.name		= "TC59SM716-CL2",
-		.rows		= 12,
-		.tck		= 10,
-		.trcd		= 20,
-		.trp		= 20,
-		.twr		= 10,
-		.refresh	= 64000,
-		.cas_latency	= 2,
-	}, {	/* Toshiba TC59SM716 CL3 */
-		.name		= "TC59SM716-CL3",
-		.rows		= 12,
-		.tck		= 8,
-		.trcd		= 20,
-		.trp		= 20,
-		.twr		= 8,
-		.refresh	= 64000,
-		.cas_latency	= 3,
-	}, {	/* Samsung K4S641632D TC75 */
-		.name		= "K4S641632D",
-		.rows		= 14,
-		.tck		= 9,
-		.trcd		= 27,
-		.trp		= 20,
-		.twr		= 9,
-		.refresh	= 64000,
-		.cas_latency	= 3,
-	}, {	/* Samsung K4S281632B-1H */
-		.name           = "K4S281632B-1H",
-		.rows		= 12,
-		.tck		= 10,
-		.trp		= 20,
-		.twr		= 10,
-		.refresh	= 64000,
-		.cas_latency	= 3,
-	}, {	/* Samsung KM416S4030CT */
-		.name		= "KM416S4030CT",
-		.rows		= 13,
-		.tck		= 8,
-		.trcd		= 24,	/* 3 CLKs */
-		.trp		= 24,	/* 3 CLKs */
-		.twr		= 16,	/* Trdl: 2 CLKs */
-		.refresh	= 64000,
-		.cas_latency	= 3,
-	}, {	/* Winbond W982516AH75L CL3 */
-		.name		= "W982516AH75L",
-		.rows		= 16,
-		.tck		= 8,
-		.trcd		= 20,
-		.trp		= 20,
-		.twr		= 8,
-		.refresh	= 64000,
-		.cas_latency	= 3,
-	}, {	/* Micron MT48LC8M16A2TG-75 */
-		.name		= "MT48LC8M16A2TG-75",
-		.rows		= 12,
-		.tck		= 8,
-		.trcd		= 20,
-		.trp		= 20,
-		.twr		= 8,
-		.refresh	= 64000,
-		.cas_latency	= 3,
-	},
-};
-
-static struct sdram_params sdram_params;
-
-/*
- * Given a period in ns and frequency in khz, calculate the number of
- * cycles of frequency in period.  Note that we round up to the next
- * cycle, even if we are only slightly over.
- */
-static inline u_int ns_to_cycles(u_int ns, u_int khz)
-{
-	return (ns * khz + 999999) / 1000000;
-}
-
-/*
- * Create the MDCAS register bit pattern.
- */
-static inline void set_mdcas(u_int *mdcas, int delayed, u_int rcd)
-{
-	u_int shift;
-
-	rcd = 2 * rcd - 1;
-	shift = delayed + 1 + rcd;
-
-	mdcas[0]  = (1 << rcd) - 1;
-	mdcas[0] |= 0x55555555 << shift;
-	mdcas[1]  = mdcas[2] = 0x55555555 << (shift & 1);
-}
-
-static void
-sdram_calculate_timing(struct sdram_info *sd, u_int cpu_khz,
-		       struct sdram_params *sdram)
-{
-	u_int mem_khz, sd_khz, trp, twr;
-
-	mem_khz = cpu_khz / 2;
-	sd_khz = mem_khz;
-
-	/*
-	 * If SDCLK would invalidate the SDRAM timings,
-	 * run SDCLK at half speed.
-	 *
-	 * CPU steppings prior to B2 must either run the memory at
-	 * half speed or use delayed read latching (errata 13).
-	 */
-	if ((ns_to_cycles(sdram->tck, sd_khz) > 1) ||
-	    (CPU_REVISION < CPU_SA1110_B2 && sd_khz < 62000))
-		sd_khz /= 2;
-
-	sd->mdcnfg = MDCNFG & 0x007f007f;
-
-	twr = ns_to_cycles(sdram->twr, mem_khz);
-
-	/* trp should always be >1 */
-	trp = ns_to_cycles(sdram->trp, mem_khz) - 1;
-	if (trp < 1)
-		trp = 1;
-
-	sd->mdcnfg |= trp << 8;
-	sd->mdcnfg |= trp << 24;
-	sd->mdcnfg |= sdram->cas_latency << 12;
-	sd->mdcnfg |= sdram->cas_latency << 28;
-	sd->mdcnfg |= twr << 14;
-	sd->mdcnfg |= twr << 30;
-
-	sd->mdrefr = MDREFR & 0xffbffff0;
-	sd->mdrefr |= 7;
-
-	if (sd_khz != mem_khz)
-		sd->mdrefr |= MDREFR_K1DB2;
-
-	/* initial number of '1's in MDCAS + 1 */
-	set_mdcas(sd->mdcas, sd_khz >= 62000,
-		ns_to_cycles(sdram->trcd, mem_khz));
-
-#ifdef DEBUG
-	printk(KERN_DEBUG "MDCNFG: %08x MDREFR: %08x MDCAS0: %08x MDCAS1: %08x MDCAS2: %08x\n",
-		sd->mdcnfg, sd->mdrefr, sd->mdcas[0], sd->mdcas[1],
-		sd->mdcas[2]);
-#endif
-}
-
-/*
- * Set the SDRAM refresh rate.
- */
-static inline void sdram_set_refresh(u_int dri)
-{
-	MDREFR = (MDREFR & 0xffff000f) | (dri << 4);
-	(void) MDREFR;
-}
-
-/*
- * Update the refresh period.  We do this such that we always refresh
- * the SDRAMs within their permissible period.  The refresh period is
- * always a multiple of the memory clock (fixed at cpu_clock / 2).
- *
- * FIXME: we don't currently take account of burst accesses here,
- * but neither do Intels DM nor Angel.
- */
-static void
-sdram_update_refresh(u_int cpu_khz, struct sdram_params *sdram)
-{
-	u_int ns_row = (sdram->refresh * 1000) >> sdram->rows;
-	u_int dri = ns_to_cycles(ns_row, cpu_khz / 2) / 32;
-
-#ifdef DEBUG
-	mdelay(250);
-	printk(KERN_DEBUG "new dri value = %d\n", dri);
-#endif
-
-	sdram_set_refresh(dri);
-}
-
-/*
- * Ok, set the CPU frequency.
- */
-static int sa1110_target(struct cpufreq_policy *policy,
-			 unsigned int target_freq,
-			 unsigned int relation)
-{
-	struct sdram_params *sdram = &sdram_params;
-	struct cpufreq_freqs freqs;
-	struct sdram_info sd;
-	unsigned long flags;
-	unsigned int ppcr, unused;
-
-	switch (relation) {
-	case CPUFREQ_RELATION_L:
-		ppcr = sa11x0_freq_to_ppcr(target_freq);
-		if (sa11x0_ppcr_to_freq(ppcr) > policy->max)
-			ppcr--;
-		break;
-	case CPUFREQ_RELATION_H:
-		ppcr = sa11x0_freq_to_ppcr(target_freq);
-		if (ppcr && (sa11x0_ppcr_to_freq(ppcr) > target_freq) &&
-		    (sa11x0_ppcr_to_freq(ppcr-1) >= policy->min))
-			ppcr--;
-		break;
-	default:
-		return -EINVAL;
-	}
-
-	freqs.old = sa11x0_getspeed(0);
-	freqs.new = sa11x0_ppcr_to_freq(ppcr);
-
-	sdram_calculate_timing(&sd, freqs.new, sdram);
-
-#if 0
-	/*
-	 * These values are wrong according to the SA1110 documentation
-	 * and errata, but they seem to work.  Need to get a storage
-	 * scope on to the SDRAM signals to work out why.
-	 */
-	if (policy->max < 147500) {
-		sd.mdrefr |= MDREFR_K1DB2;
-		sd.mdcas[0] = 0xaaaaaa7f;
-	} else {
-		sd.mdrefr &= ~MDREFR_K1DB2;
-		sd.mdcas[0] = 0xaaaaaa9f;
-	}
-	sd.mdcas[1] = 0xaaaaaaaa;
-	sd.mdcas[2] = 0xaaaaaaaa;
-#endif
-
-	cpufreq_notify_transition(policy, &freqs, CPUFREQ_PRECHANGE);
-
-	/*
-	 * The clock could be going away for some time.  Set the SDRAMs
-	 * to refresh rapidly (every 64 memory clock cycles).  To get
-	 * through the whole array, we need to wait 262144 mclk cycles.
-	 * We wait 20ms to be safe.
-	 */
-	sdram_set_refresh(2);
-	if (!irqs_disabled())
-		msleep(20);
-	else
-		mdelay(20);
-
-	/*
-	 * Reprogram the DRAM timings with interrupts disabled, and
-	 * ensure that we are doing this within a complete cache line.
-	 * This means that we won't access SDRAM for the duration of
-	 * the programming.
-	 */
-	local_irq_save(flags);
-	asm("mcr p15, 0, %0, c7, c10, 4" : : "r" (0));
-	udelay(10);
-	__asm__ __volatile__("\n\
-		b	2f					\n\
-		.align	5					\n\
-1:		str	%3, [%1, #0]		@ MDCNFG	\n\
-		str	%4, [%1, #28]		@ MDREFR	\n\
-		str	%5, [%1, #4]		@ MDCAS0	\n\
-		str	%6, [%1, #8]		@ MDCAS1	\n\
-		str	%7, [%1, #12]		@ MDCAS2	\n\
-		str	%8, [%2, #0]		@ PPCR		\n\
-		ldr	%0, [%1, #0]				\n\
-		b	3f					\n\
-2:		b	1b					\n\
-3:		nop						\n\
-		nop"
-		: "=&r" (unused)
-		: "r" (&MDCNFG), "r" (&PPCR), "0" (sd.mdcnfg),
-		  "r" (sd.mdrefr), "r" (sd.mdcas[0]),
-		  "r" (sd.mdcas[1]), "r" (sd.mdcas[2]), "r" (ppcr));
-	local_irq_restore(flags);
-
-	/*
-	 * Now, return the SDRAM refresh back to normal.
-	 */
-	sdram_update_refresh(freqs.new, sdram);
-
-	cpufreq_notify_transition(policy, &freqs, CPUFREQ_POSTCHANGE);
-
-	return 0;
-}
-
-static int __init sa1110_cpu_init(struct cpufreq_policy *policy)
-{
-	if (policy->cpu != 0)
-		return -EINVAL;
-	policy->cur = policy->min = policy->max = sa11x0_getspeed(0);
-	policy->cpuinfo.min_freq = 59000;
-	policy->cpuinfo.max_freq = 287000;
-	policy->cpuinfo.transition_latency = CPUFREQ_ETERNAL;
-	return 0;
-}
-
-/* sa1110_driver needs __refdata because it must remain after init registers
- * it with cpufreq_register_driver() */
-static struct cpufreq_driver sa1110_driver __refdata = {
-	.flags		= CPUFREQ_STICKY,
-	.verify		= sa11x0_verify_speed,
-	.target		= sa1110_target,
-	.get		= sa11x0_getspeed,
-	.init		= sa1110_cpu_init,
-	.name		= "sa1110",
-};
-
-static struct sdram_params *sa1110_find_sdram(const char *name)
-{
-	struct sdram_params *sdram;
-
-	for (sdram = sdram_tbl; sdram < sdram_tbl + ARRAY_SIZE(sdram_tbl);
-	     sdram++)
-		if (strcmp(name, sdram->name) == 0)
-			return sdram;
-
-	return NULL;
-}
-
-static char sdram_name[16];
-
-static int __init sa1110_clk_init(void)
-{
-	struct sdram_params *sdram;
-	const char *name = sdram_name;
-
-	if (!cpu_is_sa1110())
-		return -ENODEV;
-
-	if (!name[0]) {
-		if (machine_is_assabet())
-			name = "TC59SM716-CL3";
-		if (machine_is_pt_system3())
-			name = "K4S641632D";
-		if (machine_is_h3100())
-			name = "KM416S4030CT";
-		if (machine_is_jornada720())
-			name = "K4S281632B-1H";
-		if (machine_is_nanoengine())
-			name = "MT48LC8M16A2TG-75";
-	}
-
-	sdram = sa1110_find_sdram(name);
-	if (sdram) {
-		printk(KERN_DEBUG "SDRAM: tck: %d trcd: %d trp: %d"
-			" twr: %d refresh: %d cas_latency: %d\n",
-			sdram->tck, sdram->trcd, sdram->trp,
-			sdram->twr, sdram->refresh, sdram->cas_latency);
-
-		memcpy(&sdram_params, sdram, sizeof(sdram_params));
-
-		return cpufreq_register_driver(&sa1110_driver);
-	}
-
-	return 0;
-}
-
-module_param_string(sdram, sdram_name, sizeof(sdram_name), 0);
-arch_initcall(sa1110_clk_init);