cpufreq: OMAP: cleanup for multi-SoC support, move into drivers/cpufreq

Move OMAP cpufreq driver from arch/arm/mach-omap2 into
drivers/cpufreq, along with a few cleanups:

- generalize support for better handling of different SoCs in the OMAP
- use OPP layer instead of OMAP clock internals for frequency table init

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
[khilman@ti.com: move to drivers]
Signed-off-by: Kevin Hilman <khilman@ti.com>

arch/arm/plat-omap/Makefile

@@ -19,7 +19,6 @@ obj-$(CONFIG_ARCH_OMAP4) += omap_device.o
 
 obj-$(CONFIG_OMAP_MCBSP) += mcbsp.o
 
-obj-$(CONFIG_CPU_FREQ) += cpu-omap.o
 obj-$(CONFIG_OMAP_DM_TIMER) += dmtimer.o
 obj-$(CONFIG_OMAP_DEBUG_DEVICES) += debug-devices.o
 obj-$(CONFIG_OMAP_DEBUG_LEDS) += debug-leds.o

drivers/cpufreq/Makefile

@@ -43,6 +43,7 @@ obj-$(CONFIG_UX500_SOC_DB8500)		+= db8500-cpufreq.o
 obj-$(CONFIG_ARM_S3C64XX_CPUFREQ)	+= s3c64xx-cpufreq.o
 obj-$(CONFIG_ARM_S5PV210_CPUFREQ)	+= s5pv210-cpufreq.o
 obj-$(CONFIG_ARM_EXYNOS4210_CPUFREQ)	+= exynos4210-cpufreq.o
+obj-$(CONFIG_ARCH_OMAP2PLUS)            += omap-cpufreq.o
 
 ##################################################################################
 # PowerPC platform drivers

arch/arm/plat-omap/cpu-omap.c → drivers/cpufreq/omap-cpufreq.c

@@ -1,13 +1,14 @@
 /*
- *  linux/arch/arm/plat-omap/cpu-omap.c
- *
  *  CPU frequency scaling for OMAP
  *
  *  Copyright (C) 2005 Nokia Corporation
  *  Written by Tony Lindgren <tony@atomide.com>
  *
  *  Based on cpu-sa1110.c, Copyright (C) 2001 Russell King
  *
+ * Copyright (C) 2007-2011 Texas Instruments, Inc.
+ * - OMAP3/4 support by Rajendra Nayak, Santosh Shilimkar
+ *
  * 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.
@@ -21,25 +22,22 @@
 #include <linux/err.h>
 #include <linux/clk.h>
 #include <linux/io.h>
+#include <linux/opp.h>
 
-#include <mach/hardware.h>
-#include <plat/clock.h>
 #include <asm/system.h>
+#include <asm/smp_plat.h>
 
-#define VERY_HI_RATE	900000000
+#include <plat/clock.h>
+#include <plat/omap-pm.h>
+#include <plat/common.h>
 
-static struct cpufreq_frequency_table *freq_table;
+#include <mach/hardware.h>
 
-#ifdef CONFIG_ARCH_OMAP1
-#define MPU_CLK		"mpu"
-#else
-#define MPU_CLK		"virt_prcm_set"
-#endif
+#define VERY_HI_RATE	900000000
 
+static struct cpufreq_frequency_table *freq_table;
 static struct clk *mpu_clk;
 
-/* TODO: Add support for SDRAM timing changes */
-
 static int omap_verify_speed(struct cpufreq_policy *policy)
 {
 	if (freq_table)
@@ -73,8 +71,8 @@ static int omap_target(struct cpufreq_policy *policy,
 		       unsigned int target_freq,
 		       unsigned int relation)
 {
-	struct cpufreq_freqs freqs;
 	int ret = 0;
+	struct cpufreq_freqs freqs;
 
 	/* Ensure desired rate is within allowed range.  Some govenors
 	 * (ondemand) will just pass target_freq=0 to get the minimum. */
@@ -91,11 +89,13 @@ static int omap_target(struct cpufreq_policy *policy,
 		return ret;
 
 	cpufreq_notify_transition(&freqs, CPUFREQ_PRECHANGE);
+
 #ifdef CONFIG_CPU_FREQ_DEBUG
-	printk(KERN_DEBUG "cpufreq-omap: transition: %u --> %u\n",
-	       freqs.old, freqs.new);
+	pr_info("cpufreq-omap: transition: %u --> %u\n", freqs.old, freqs.new);
 #endif
+
 	ret = clk_set_rate(mpu_clk, freqs.new * 1000);
+
 	cpufreq_notify_transition(&freqs, CPUFREQ_POSTCHANGE);
 
 	return ret;
@@ -104,8 +104,15 @@ static int omap_target(struct cpufreq_policy *policy,
 static int __cpuinit omap_cpu_init(struct cpufreq_policy *policy)
 {
 	int result = 0;
+	struct device *mpu_dev;
+
+	if (cpu_is_omap24xx())
+		mpu_clk = clk_get(NULL, "virt_prcm_set");
+	else if (cpu_is_omap34xx())
+		mpu_clk = clk_get(NULL, "dpll1_ck");
+	else if (cpu_is_omap44xx())
+		mpu_clk = clk_get(NULL, "dpll_mpu_ck");
 
-	mpu_clk = clk_get(NULL, MPU_CLK);
 	if (IS_ERR(mpu_clk))
 		return PTR_ERR(mpu_clk);
 
@@ -114,7 +121,13 @@ static int __cpuinit omap_cpu_init(struct cpufreq_policy *policy)
 
 	policy->cur = policy->min = policy->max = omap_getspeed(0);
 
-	clk_init_cpufreq_table(&freq_table);
+	mpu_dev = omap2_get_mpuss_device();
+	if (!mpu_dev) {
+		pr_warning("%s: unable to get the mpu device\n", __func__);
+		return -EINVAL;
+	}
+	opp_init_cpufreq_table(mpu_dev, &freq_table);
+
 	if (freq_table) {
 		result = cpufreq_frequency_table_cpuinfo(policy, freq_table);
 		if (!result)
@@ -126,6 +139,10 @@ static int __cpuinit omap_cpu_init(struct cpufreq_policy *policy)
 							VERY_HI_RATE) / 1000;
 	}
 
+	policy->min = policy->cpuinfo.min_freq;
+	policy->max = policy->cpuinfo.max_freq;
+	policy->cur = omap_getspeed(0);
+
 	/* FIXME: what's the actual transition time? */
 	policy->cpuinfo.transition_latency = 300 * 1000;
 
@@ -160,12 +177,12 @@ static int __init omap_cpufreq_init(void)
 	return cpufreq_register_driver(&omap_driver);
 }
 
-arch_initcall(omap_cpufreq_init);
-
-/*
- * if ever we want to remove this, upon cleanup call:
- *
- * cpufreq_unregister_driver()
- * cpufreq_frequency_table_put_attr()
- */
+static void __exit omap_cpufreq_exit(void)
+{
+	cpufreq_unregister_driver(&omap_driver);
+}
 
+MODULE_DESCRIPTION("cpufreq driver for OMAP SoCs");
+MODULE_LICENSE("GPL");
+module_init(omap_cpufreq_init);
+module_exit(omap_cpufreq_exit);