ARM: S3C24XX: Move S3C2440/S3C2442 plat-s3c24xx support to mach-s3c2440

[pandora-kernel.git] / arch / arm / mach-s3c2440 / s3c244x-clock.c

diff --git a/arch/arm/mach-s3c2440/s3c244x-clock.c b/arch/arm/mach-s3c2440/s3c244x-clock.c
new file mode 100644 (file)
index 0000000..f8d9613
--- /dev/null
+++ b/arch/arm/mach-s3c2440/s3c244x-clock.c
@@ -0,0 +1,138 @@
+/* linux/arch/arm/plat-s3c24xx/s3c24xx-clock.c
+ *
+ * Copyright (c) 2004-2008 Simtec Electronics
+ *     http://armlinux.simtec.co.uk/
+ *     Ben Dooks <ben@simtec.co.uk>
+ *
+ * S3C2440/S3C2442 Common clock 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/interrupt.h>
+#include <linux/ioport.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>
+
+static int s3c2440_setparent_armclk(struct clk *clk, struct clk *parent)
+{
+       unsigned long camdivn;
+       unsigned long dvs;
+
+       if (parent == &clk_f)
+               dvs = 0;
+       else if (parent == &clk_h)
+               dvs = S3C2440_CAMDIVN_DVSEN;
+       else
+               return -EINVAL;
+
+       clk->parent = parent;
+
+       camdivn  = __raw_readl(S3C2440_CAMDIVN);
+       camdivn &= ~S3C2440_CAMDIVN_DVSEN;
+       camdivn |= dvs;
+       __raw_writel(camdivn, S3C2440_CAMDIVN);
+
+       return 0;
+}
+
+static struct clk clk_arm = {
+       .name           = "armclk",
+       .id             = -1,
+       .ops            = &(struct clk_ops) {
+               .set_parent     = s3c2440_setparent_armclk,
+       },
+};
+
+static int s3c244x_clk_add(struct sys_device *sysdev)
+{
+       unsigned long camdivn = __raw_readl(S3C2440_CAMDIVN);
+       unsigned long clkdivn;
+       struct clk *clock_upll;
+       int ret;
+
+       printk("S3C244X: Clock Support, DVS %s\n",
+              (camdivn & S3C2440_CAMDIVN_DVSEN) ? "on" : "off");
+
+       clk_arm.parent = (camdivn & S3C2440_CAMDIVN_DVSEN) ? &clk_h : &clk_f;
+
+       ret = s3c24xx_register_clock(&clk_arm);
+       if (ret < 0) {
+               printk(KERN_ERR "S3C24XX: Failed to add armclk (%d)\n", ret);
+               return ret;
+       }
+
+       clock_upll = clk_get(NULL, "upll");
+       if (IS_ERR(clock_upll)) {
+               printk(KERN_ERR "S3C244X: Failed to get upll clock\n");
+               return -ENOENT;
+       }
+
+       /* check rate of UPLL, and if it is near 96MHz, then change
+        * to using half the UPLL rate for the system */
+
+       if (clk_get_rate(clock_upll) > (94 * MHZ)) {
+               clk_usb_bus.rate = clk_get_rate(clock_upll) / 2;
+
+               spin_lock(&clocks_lock);
+
+               clkdivn = __raw_readl(S3C2410_CLKDIVN);
+               clkdivn |= S3C2440_CLKDIVN_UCLK;
+               __raw_writel(clkdivn, S3C2410_CLKDIVN);
+
+               spin_unlock(&clocks_lock);
+       }
+
+       return 0;
+}
+
+static struct sysdev_driver s3c2440_clk_driver = {
+       .add            = s3c244x_clk_add,
+};
+
+static int s3c2440_clk_init(void)
+{
+       return sysdev_driver_register(&s3c2440_sysclass, &s3c2440_clk_driver);
+}
+
+arch_initcall(s3c2440_clk_init);
+
+static struct sysdev_driver s3c2442_clk_driver = {
+       .add            = s3c244x_clk_add,
+};
+
+static int s3c2442_clk_init(void)
+{
+       return sysdev_driver_register(&s3c2442_sysclass, &s3c2442_clk_driver);
+}
+
+arch_initcall(s3c2442_clk_init);