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https://github.com/edk2-porting/linux-next.git
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d60d506e6b
* 'next/cleanup-s3c24xx' of git://git.kernel.org/pub/scm/linux/kernel/git/kgene/linux-samsung: (24 commits) ARM: S3C24XX: remove call to s3c24xx_setup_clocks ARM: S3C24XX: add get_rate for clk_p on S3C2416/2443 ARM: S3C24XX: add get_rate for clk_h on S3C2416/2443 ARM: S3C24XX: remove XXX_setup_clocks method from S3C2443 ARM: S3C24XX: remove obsolete S3C2416_DMA option ARM: S3C24XX: Reuse S3C2443 dma for S3C2416 ARM: S3C24XX: Fix indentation of dma-s3c2443 ARM: S3C24XX: Move device setup files to mach directory ARM: S3C24XX: Consolidate Simtec extensions ARM: S3C24XX: move simtec-specific code to mach directory ARM: S3C24XX: Move common-smdk code to mach directory ARM: S3C24XX: Move s3c2443-clock.c to mach-s3c24xx ARM: s3c2410_defconfig: update s3c2410_defconfig ARM: S3C2443: move mach-s3c2443/* into mach-s3c24xx/ ARM: S3C2440: move mach-s3c2440/* into mach-s3c24xx/ ARM: S3C2416: move mach-s3c2416/* into mach-s3c24xx/ ARM: S3C2412: move mach-s3c2412/* into mach-s3c24xx/ ARM: S3C2410: move mach-s3c2410/* into mach-s3c24xx/ ARM: S3C24XX: change the ARCH_S3C2410 to ARCH_S3C24XX ARM: S3C2410: move s3c2410_baseclk_add to clock.h ...
142 lines
3.4 KiB
C
142 lines
3.4 KiB
C
/* linux/arch/arm/plat-s3c24xx/s3c24xx-clock.c
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*
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* Copyright (c) 2004-2008 Simtec Electronics
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* http://armlinux.simtec.co.uk/
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* Ben Dooks <ben@simtec.co.uk>
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*
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* S3C2440/S3C2442 Common clock support
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/ioport.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <mach/hardware.h>
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#include <linux/atomic.h>
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#include <asm/irq.h>
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#include <mach/regs-clock.h>
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#include <plat/clock.h>
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#include <plat/cpu.h>
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static int s3c2440_setparent_armclk(struct clk *clk, struct clk *parent)
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{
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unsigned long camdivn;
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unsigned long dvs;
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if (parent == &clk_f)
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dvs = 0;
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else if (parent == &clk_h)
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dvs = S3C2440_CAMDIVN_DVSEN;
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else
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return -EINVAL;
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clk->parent = parent;
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camdivn = __raw_readl(S3C2440_CAMDIVN);
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camdivn &= ~S3C2440_CAMDIVN_DVSEN;
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camdivn |= dvs;
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__raw_writel(camdivn, S3C2440_CAMDIVN);
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return 0;
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}
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static struct clk clk_arm = {
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.name = "armclk",
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.id = -1,
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.ops = &(struct clk_ops) {
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.set_parent = s3c2440_setparent_armclk,
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},
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};
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static int s3c244x_clk_add(struct device *dev, struct subsys_interface *sif)
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{
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unsigned long camdivn = __raw_readl(S3C2440_CAMDIVN);
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unsigned long clkdivn;
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struct clk *clock_upll;
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int ret;
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printk("S3C244X: Clock Support, DVS %s\n",
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(camdivn & S3C2440_CAMDIVN_DVSEN) ? "on" : "off");
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clk_arm.parent = (camdivn & S3C2440_CAMDIVN_DVSEN) ? &clk_h : &clk_f;
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ret = s3c24xx_register_clock(&clk_arm);
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if (ret < 0) {
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printk(KERN_ERR "S3C24XX: Failed to add armclk (%d)\n", ret);
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return ret;
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}
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clock_upll = clk_get(NULL, "upll");
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if (IS_ERR(clock_upll)) {
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printk(KERN_ERR "S3C244X: Failed to get upll clock\n");
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return -ENOENT;
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}
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/* check rate of UPLL, and if it is near 96MHz, then change
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* to using half the UPLL rate for the system */
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if (clk_get_rate(clock_upll) > (94 * MHZ)) {
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clk_usb_bus.rate = clk_get_rate(clock_upll) / 2;
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spin_lock(&clocks_lock);
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clkdivn = __raw_readl(S3C2410_CLKDIVN);
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clkdivn |= S3C2440_CLKDIVN_UCLK;
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__raw_writel(clkdivn, S3C2410_CLKDIVN);
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spin_unlock(&clocks_lock);
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}
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return 0;
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}
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static struct subsys_interface s3c2440_clk_interface = {
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.name = "s3c2440_clk",
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.subsys = &s3c2440_subsys,
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.add_dev = s3c244x_clk_add,
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};
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static int s3c2440_clk_init(void)
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{
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return subsys_interface_register(&s3c2440_clk_interface);
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}
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arch_initcall(s3c2440_clk_init);
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static struct subsys_interface s3c2442_clk_interface = {
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.name = "s3c2442_clk",
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.subsys = &s3c2442_subsys,
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.add_dev = s3c244x_clk_add,
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};
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static int s3c2442_clk_init(void)
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{
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return subsys_interface_register(&s3c2442_clk_interface);
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}
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arch_initcall(s3c2442_clk_init);
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