summaryrefslogtreecommitdiffstats
path: root/arch/m68k/coldfire/clk.c
diff options
context:
space:
mode:
authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 18:49:45 +0000
commit2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch)
tree848558de17fb3008cdf4d861b01ac7781903ce39 /arch/m68k/coldfire/clk.c
parentInitial commit. (diff)
downloadlinux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz
linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/m68k/coldfire/clk.c')
-rw-r--r--arch/m68k/coldfire/clk.c144
1 files changed, 144 insertions, 0 deletions
diff --git a/arch/m68k/coldfire/clk.c b/arch/m68k/coldfire/clk.c
new file mode 100644
index 000000000..d03b6c4aa
--- /dev/null
+++ b/arch/m68k/coldfire/clk.c
@@ -0,0 +1,144 @@
+// SPDX-License-Identifier: GPL-2.0
+/***************************************************************************/
+
+/*
+ * clk.c -- general ColdFire CPU kernel clk handling
+ *
+ * Copyright (C) 2009, Greg Ungerer (gerg@snapgear.com)
+ */
+
+/***************************************************************************/
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/err.h>
+#include <asm/coldfire.h>
+#include <asm/mcfsim.h>
+#include <asm/mcfclk.h>
+
+static DEFINE_SPINLOCK(clk_lock);
+
+#ifdef MCFPM_PPMCR0
+/*
+ * For more advanced ColdFire parts that have clocks that can be enabled
+ * we supply enable/disable functions. These must properly define their
+ * clocks in their platform specific code.
+ */
+void __clk_init_enabled(struct clk *clk)
+{
+ clk->enabled = 1;
+ clk->clk_ops->enable(clk);
+}
+
+void __clk_init_disabled(struct clk *clk)
+{
+ clk->enabled = 0;
+ clk->clk_ops->disable(clk);
+}
+
+static void __clk_enable0(struct clk *clk)
+{
+ __raw_writeb(clk->slot, MCFPM_PPMCR0);
+}
+
+static void __clk_disable0(struct clk *clk)
+{
+ __raw_writeb(clk->slot, MCFPM_PPMSR0);
+}
+
+struct clk_ops clk_ops0 = {
+ .enable = __clk_enable0,
+ .disable = __clk_disable0,
+};
+
+#ifdef MCFPM_PPMCR1
+static void __clk_enable1(struct clk *clk)
+{
+ __raw_writeb(clk->slot, MCFPM_PPMCR1);
+}
+
+static void __clk_disable1(struct clk *clk)
+{
+ __raw_writeb(clk->slot, MCFPM_PPMSR1);
+}
+
+struct clk_ops clk_ops1 = {
+ .enable = __clk_enable1,
+ .disable = __clk_disable1,
+};
+#endif /* MCFPM_PPMCR1 */
+#endif /* MCFPM_PPMCR0 */
+
+int clk_enable(struct clk *clk)
+{
+ unsigned long flags;
+
+ if (!clk)
+ return 0;
+
+ spin_lock_irqsave(&clk_lock, flags);
+ if ((clk->enabled++ == 0) && clk->clk_ops)
+ clk->clk_ops->enable(clk);
+ spin_unlock_irqrestore(&clk_lock, flags);
+
+ return 0;
+}
+EXPORT_SYMBOL(clk_enable);
+
+void clk_disable(struct clk *clk)
+{
+ unsigned long flags;
+
+ if (!clk)
+ return;
+
+ spin_lock_irqsave(&clk_lock, flags);
+ if ((--clk->enabled == 0) && clk->clk_ops)
+ clk->clk_ops->disable(clk);
+ spin_unlock_irqrestore(&clk_lock, flags);
+}
+EXPORT_SYMBOL(clk_disable);
+
+unsigned long clk_get_rate(struct clk *clk)
+{
+ if (!clk)
+ return 0;
+
+ return clk->rate;
+}
+EXPORT_SYMBOL(clk_get_rate);
+
+/* dummy functions, should not be called */
+long clk_round_rate(struct clk *clk, unsigned long rate)
+{
+ WARN_ON(clk);
+ return 0;
+}
+EXPORT_SYMBOL(clk_round_rate);
+
+int clk_set_rate(struct clk *clk, unsigned long rate)
+{
+ WARN_ON(clk);
+ return 0;
+}
+EXPORT_SYMBOL(clk_set_rate);
+
+int clk_set_parent(struct clk *clk, struct clk *parent)
+{
+ WARN_ON(clk);
+ return 0;
+}
+EXPORT_SYMBOL(clk_set_parent);
+
+struct clk *clk_get_parent(struct clk *clk)
+{
+ WARN_ON(clk);
+ return NULL;
+}
+EXPORT_SYMBOL(clk_get_parent);
+
+/***************************************************************************/