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/*
* Copyright (C) 2010 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.
*
* @ingroup PM
*/
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/spinlock.h>
#include <linux/platform_device.h>
#include <linux/notifier.h>
#include <linux/cpufreq.h>
#include <mach/hardware.h>
#include <linux/io.h>
#include <asm/system.h>
#include <mach/clock.h>
#include <mach/bus_freq.h>
#include "regs-clkctrl.h"
#include "regs-digctl.h"
#define CLKCTRL_BASE_ADDR IO_ADDRESS(CLKCTRL_PHYS_ADDR)
#define DIGCTRL_BASE_ADDR IO_ADDRESS(DIGCTL_PHYS_ADDR)
#define BF(value, field) (((value) << BP_##field) & BM_##field)
struct profile profiles[] = {
{ 454736, 151570, 205710, 0, 1550000,
1450000, 355000, 3300000, 1750000, 24000, 0 },
{ 360000, 120000, 130910, 0, 1350000,
1250000, 200000, 3300000, 1750000, 24000, 0 },
{ 261818, 130910, 130910, 0, 1350000,
1250000, 173000, 3300000, 1750000, 24000, 0 },
{ 64000, 64000, 130910, 3, 1350000,
1250000, 150000, 3300000, 1750000, 24000, 0 },
{ 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0 },
};
static struct device *busfreq_dev;
static struct clk *usb_clk0;
static struct clk *usb_clk1;
static struct clk *lcdif_clk;
u32 clkseq_setting;
int low_freq_used(void)
{
if ((clk_get_usecount(usb_clk0) == 0)
&& (clk_get_usecount(usb_clk1) == 0)
&& (clk_get_usecount(lcdif_clk) == 0))
return 1;
else
return 0;
}
int is_hclk_autoslow_ok(void)
{
if ((clk_get_usecount(usb_clk0) == 0)
&& (clk_get_usecount(usb_clk1) == 0))
return 1;
else
return 0;
}
int timing_ctrl_rams(int ss)
{
__raw_writel(BF(ss, DIGCTL_ARMCACHE_VALID_SS) |
BF(ss, DIGCTL_ARMCACHE_DRTY_SS) |
BF(ss, DIGCTL_ARMCACHE_CACHE_SS) |
BF(ss, DIGCTL_ARMCACHE_DTAG_SS) |
BF(ss, DIGCTL_ARMCACHE_ITAG_SS),
DIGCTRL_BASE_ADDR + HW_DIGCTL_ARMCACHE);
return 0;
}
/*!
* 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)
{
int ret = 0;
busfreq_dev = &pdev->dev;
usb_clk0 = clk_get(NULL, "usb_clk0");
if (IS_ERR(usb_clk0)) {
ret = PTR_ERR(usb_clk0);
goto out_usb0;
}
usb_clk1 = clk_get(NULL, "usb_clk1");
if (IS_ERR(usb_clk1)) {
ret = PTR_ERR(usb_clk1);
goto out_usb1;
}
lcdif_clk = clk_get(NULL, "dis_lcdif");
if (IS_ERR(lcdif_clk)) {
ret = PTR_ERR(lcdif_clk);
goto out_lcd;
}
return 0;
out_lcd:
clk_put(usb_clk1);
out_usb1:
clk_put(usb_clk0);
out_usb0:
return ret;
}
static struct platform_driver busfreq_driver = {
.driver = {
.name = "busfreq",
},
.probe = busfreq_probe,
};
/*!
* 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)
{
/* Unregister the device structure */
platform_driver_unregister(&busfreq_driver);
}
module_init(busfreq_init);
module_exit(busfreq_cleanup);
MODULE_AUTHOR("Freescale Semiconductor, Inc.");
MODULE_DESCRIPTION("BusFreq driver");
MODULE_LICENSE("GPL");
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