linux/arch/arm/mach-s3c2440/s3c2442.c
Rafael J. Wysocki bb072c3cf2 ARM / Samsung: Use struct syscore_ops for "core" power management
Replace sysdev classes and struct sys_device objects used for "core"
power management by Samsung platforms with struct syscore_ops objects
that are simpler.

This generally reduces the code size and the kernel memory footprint.
It also is necessary for removing sysdevs entirely from the kernel in
the future.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
2011-04-24 19:16:10 +02:00

186 lines
4.4 KiB
C

/* linux/arch/arm/mach-s3c2442/s3c2442.c
*
* Copyright (c) 2004-2005 Simtec Electronics
* http://armlinux.simtec.co.uk/
* Ben Dooks <ben@simtec.co.uk>
*
* S3C2442 core and lock support
*
* 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
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/device.h>
#include <linux/sysdev.h>
#include <linux/syscore_ops.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/mutex.h>
#include <linux/gpio.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <mach/hardware.h>
#include <asm/atomic.h>
#include <asm/irq.h>
#include <mach/regs-clock.h>
#include <plat/clock.h>
#include <plat/cpu.h>
#include <plat/s3c244x.h>
#include <plat/pm.h>
#include <plat/gpio-core.h>
#include <plat/gpio-cfg.h>
#include <plat/gpio-cfg-helpers.h>
/* S3C2442 extended clock support */
static unsigned long s3c2442_camif_upll_round(struct clk *clk,
unsigned long rate)
{
unsigned long parent_rate = clk_get_rate(clk->parent);
int div;
if (rate > parent_rate)
return parent_rate;
div = parent_rate / rate;
if (div == 3)
return parent_rate / 3;
/* note, we remove the +/- 1 calculations for the divisor */
div /= 2;
if (div < 1)
div = 1;
else if (div > 16)
div = 16;
return parent_rate / (div * 2);
}
static int s3c2442_camif_upll_setrate(struct clk *clk, unsigned long rate)
{
unsigned long parent_rate = clk_get_rate(clk->parent);
unsigned long camdivn = __raw_readl(S3C2440_CAMDIVN);
rate = s3c2442_camif_upll_round(clk, rate);
camdivn &= ~S3C2442_CAMDIVN_CAMCLK_DIV3;
if (rate == parent_rate) {
camdivn &= ~S3C2440_CAMDIVN_CAMCLK_SEL;
} else if ((parent_rate / rate) == 3) {
camdivn |= S3C2440_CAMDIVN_CAMCLK_SEL;
camdivn |= S3C2442_CAMDIVN_CAMCLK_DIV3;
} else {
camdivn &= ~S3C2440_CAMDIVN_CAMCLK_MASK;
camdivn |= S3C2440_CAMDIVN_CAMCLK_SEL;
camdivn |= (((parent_rate / rate) / 2) - 1);
}
__raw_writel(camdivn, S3C2440_CAMDIVN);
return 0;
}
/* Extra S3C2442 clocks */
static struct clk s3c2442_clk_cam = {
.name = "camif",
.id = -1,
.enable = s3c2410_clkcon_enable,
.ctrlbit = S3C2440_CLKCON_CAMERA,
};
static struct clk s3c2442_clk_cam_upll = {
.name = "camif-upll",
.id = -1,
.ops = &(struct clk_ops) {
.set_rate = s3c2442_camif_upll_setrate,
.round_rate = s3c2442_camif_upll_round,
},
};
static int s3c2442_clk_add(struct sys_device *sysdev)
{
struct clk *clock_upll;
struct clk *clock_h;
struct clk *clock_p;
clock_p = clk_get(NULL, "pclk");
clock_h = clk_get(NULL, "hclk");
clock_upll = clk_get(NULL, "upll");
if (IS_ERR(clock_p) || IS_ERR(clock_h) || IS_ERR(clock_upll)) {
printk(KERN_ERR "S3C2442: Failed to get parent clocks\n");
return -EINVAL;
}
s3c2442_clk_cam.parent = clock_h;
s3c2442_clk_cam_upll.parent = clock_upll;
s3c24xx_register_clock(&s3c2442_clk_cam);
s3c24xx_register_clock(&s3c2442_clk_cam_upll);
clk_disable(&s3c2442_clk_cam);
return 0;
}
static struct sysdev_driver s3c2442_clk_driver = {
.add = s3c2442_clk_add,
};
static __init int s3c2442_clk_init(void)
{
return sysdev_driver_register(&s3c2442_sysclass, &s3c2442_clk_driver);
}
arch_initcall(s3c2442_clk_init);
static struct sys_device s3c2442_sysdev = {
.cls = &s3c2442_sysclass,
};
int __init s3c2442_init(void)
{
printk("S3C2442: Initialising architecture\n");
register_syscore_ops(&s3c2410_pm_syscore_ops);
register_syscore_ops(&s3c244x_pm_syscore_ops);
register_syscore_ops(&s3c24xx_irq_syscore_ops);
return sysdev_register(&s3c2442_sysdev);
}
void __init s3c2442_map_io(void)
{
s3c244x_map_io();
s3c24xx_gpiocfg_default.set_pull = s3c_gpio_setpull_1down;
s3c24xx_gpiocfg_default.get_pull = s3c_gpio_getpull_1down;
}