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/*
* Copyright (C) 2011 Freescale Semiconductor, Inc. All Rights Reserved.
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*!
* @file bus_freq.c
*
* @brief A common API for the Freescale Semiconductor i.MXC CPUfreq module
* and DVFS CORE module.
*
* The APIs are for setting bus frequency to low or high.
*
* @ingroup PM
*/
#include <asm/io.h>
#include <linux/sched.h>
#include <linux/proc_fs.h>
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/mutex.h>
#include <mach/iram.h>
#include <mach/hardware.h>
#include <mach/clock.h>
#include <mach/mxc_dvfs.h>
#include <mach/sdram_autogating.h>
#include <asm/mach/map.h>
#include <asm/mach-types.h>
#include <asm/cacheflush.h>
#include <asm/tlb.h>
#define LP_LOW_VOLTAGE 1050000
#define LP_NORMAL_VOLTAGE 1250000
#define LP_APM_CLK 24000000
#define NAND_LP_APM_CLK 12000000
#define AXI_A_NORMAL_CLK 166250000
#define AXI_A_CLK_NORMAL_DIV 4
#define AXI_B_CLK_NORMAL_DIV 5
#define AHB_CLK_NORMAL_DIV AXI_B_CLK_NORMAL_DIV
#define EMI_SLOW_CLK_NORMAL_DIV AXI_B_CLK_NORMAL_DIV
#define NFC_CLK_NORMAL_DIV 4
#define SPIN_DELAY 1000000 /* in nanoseconds */
#define DDR_TYPE_DDR3 0x0
#define DDR_TYPE_DDR2 0x1
DEFINE_SPINLOCK(ddr_freq_lock);
unsigned long lp_normal_rate;
unsigned long lp_med_rate;
unsigned long ddr_normal_rate;
unsigned long ddr_med_rate;
unsigned long ddr_low_rate;
struct regulator *pll_regulator;
struct regulator *lp_regulator;
int low_bus_freq_mode;
int high_bus_freq_mode;
int med_bus_freq_mode;
int bus_freq_scaling_initialized;
char *lp_reg_id;
static struct device *busfreq_dev;
static int busfreq_suspended;
/* True if bus_frequency is scaled not using DVFS-PER */
int bus_freq_scaling_is_active;
int cpu_op_nr;
int lp_high_freq;
int lp_med_freq;
struct workqueue_struct *voltage_wq;
struct completion voltage_change_cmpl;
int low_freq_bus_used(void);
void set_ddr_freq(int ddr_freq);
extern struct cpu_op *(*get_cpu_op)(int *op);
extern void __iomem *ccm_base;
extern void __iomem *databahn_base;
extern int update_ddr_freq(int ddr_rate);
struct mutex bus_freq_mutex;
struct timeval start_time;
struct timeval end_time;
int set_low_bus_freq(void)
{
return 0;
}
int set_high_bus_freq(int high_bus_freq)
{
return 0;
}
void exit_lpapm_mode_mx6q(int high_bus_freq)
{
}
void set_ddr_freq(int ddr_rate)
{
}
int low_freq_bus_used(void)
{
if ((lp_high_freq == 0)
&& (lp_med_freq == 0))
return 1;
else
return 0;
}
void setup_pll(void)
{
}
static ssize_t bus_freq_scaling_enable_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
if (bus_freq_scaling_is_active)
return sprintf(buf, "Bus frequency scaling is enabled\n");
else
return sprintf(buf, "Bus frequency scaling is disabled\n");
}
static ssize_t bus_freq_scaling_enable_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t size)
{
return size;
}
static int busfreq_suspend(struct platform_device *pdev, pm_message_t message)
{
if (low_bus_freq_mode)
set_high_bus_freq(1);
busfreq_suspended = 1;
return 0;
}
static int busfreq_resume(struct platform_device *pdev)
{
busfreq_suspended = 0;
return 0;
}
static DEVICE_ATTR(enable, 0644, bus_freq_scaling_enable_show,
bus_freq_scaling_enable_store);
/*!
* This is the probe routine for the bus frequency driver.
*
* @param pdev The platform device structure
*
* @return The function returns 0 on success
*
*/
static int __devinit busfreq_probe(struct platform_device *pdev)
{
return 0;
}
static struct platform_driver busfreq_driver = {
.driver = {
.name = "imx_busfreq",
},
.probe = busfreq_probe,
.suspend = busfreq_suspend,
.resume = busfreq_resume,
};
/*!
* Initialise the busfreq_driver.
*
* @return The function always returns 0.
*/
static int __init busfreq_init(void)
{
if (platform_driver_register(&busfreq_driver) != 0) {
printk(KERN_ERR "busfreq_driver register failed\n");
return -ENODEV;
}
printk(KERN_INFO "Bus freq driver module loaded\n");
return 0;
}
static void __exit busfreq_cleanup(void)
{
sysfs_remove_file(&busfreq_dev->kobj, &dev_attr_enable.attr);
/* Unregister the device structure */
platform_driver_unregister(&busfreq_driver);
bus_freq_scaling_initialized = 0;
}
module_init(busfreq_init);
module_exit(busfreq_cleanup);
MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_DESCRIPTION("BusFreq driver");
MODULE_LICENSE("GPL");
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