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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/arm/mach-w90x900/clksel.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/arm/mach-w90x900/clksel.c')
-rw-r--r--kernel/arch/arm/mach-w90x900/clksel.c91
1 files changed, 91 insertions, 0 deletions
diff --git a/kernel/arch/arm/mach-w90x900/clksel.c b/kernel/arch/arm/mach-w90x900/clksel.c
new file mode 100644
index 000000000..06d867dce
--- /dev/null
+++ b/kernel/arch/arm/mach-w90x900/clksel.c
@@ -0,0 +1,91 @@
+/*
+ * linux/arch/arm/mach-w90x900/clksel.c
+ *
+ * Copyright (c) 2008 Nuvoton technology corporation
+ *
+ * Wan ZongShun <mcuos.com@gmail.com>
+ *
+ * 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;version 2 of the License.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/list.h>
+#include <linux/errno.h>
+#include <linux/err.h>
+#include <linux/string.h>
+#include <linux/clk.h>
+#include <linux/mutex.h>
+#include <linux/io.h>
+
+#include <mach/hardware.h>
+#include <mach/regs-clock.h>
+
+#define PLL0 0x00
+#define PLL1 0x01
+#define OTHER 0x02
+#define EXT 0x03
+#define MSOFFSET 0x0C
+#define ATAOFFSET 0x0a
+#define LCDOFFSET 0x06
+#define AUDOFFSET 0x04
+#define CPUOFFSET 0x00
+
+static DEFINE_MUTEX(clksel_sem);
+
+static void clock_source_select(const char *dev_id, unsigned int clkval)
+{
+ unsigned int clksel, offset;
+
+ clksel = __raw_readl(REG_CLKSEL);
+
+ if (strcmp(dev_id, "nuc900-ms") == 0)
+ offset = MSOFFSET;
+ else if (strcmp(dev_id, "nuc900-atapi") == 0)
+ offset = ATAOFFSET;
+ else if (strcmp(dev_id, "nuc900-lcd") == 0)
+ offset = LCDOFFSET;
+ else if (strcmp(dev_id, "nuc900-ac97") == 0)
+ offset = AUDOFFSET;
+ else
+ offset = CPUOFFSET;
+
+ clksel &= ~(0x03 << offset);
+ clksel |= (clkval << offset);
+
+ __raw_writel(clksel, REG_CLKSEL);
+}
+
+void nuc900_clock_source(struct device *dev, unsigned char *src)
+{
+ unsigned int clkval;
+ const char *dev_id;
+
+ BUG_ON(!src);
+ clkval = 0;
+
+ mutex_lock(&clksel_sem);
+
+ if (dev)
+ dev_id = dev_name(dev);
+ else
+ dev_id = "cpufreq";
+
+ if (strcmp(src, "pll0") == 0)
+ clkval = PLL0;
+ else if (strcmp(src, "pll1") == 0)
+ clkval = PLL1;
+ else if (strcmp(src, "ext") == 0)
+ clkval = EXT;
+ else if (strcmp(src, "oth") == 0)
+ clkval = OTHER;
+
+ clock_source_select(dev_id, clkval);
+
+ mutex_unlock(&clksel_sem);
+}
+EXPORT_SYMBOL(nuc900_clock_source);
+