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authorJuergen Beisert <j.beisert@pengutronix.de>2008-07-05 10:02:47 +0200
committerRobert Schwebel <r.schwebel@pengutronix.de>2008-07-05 10:02:47 +0200
commitc0db2ea4e366c94dd3f880928c02534156e3d1b9 (patch)
treee8486fedc9d405b2867c3a474ebc18fad394836c /include/asm-arm
parent38a41fdf94c449c165213e4665c3f8a0d30f8aba (diff)
MXC family: Add clock handling
Internal clock path handling for the mxc CPUs. Changed against the original Freescale code (and against clocklib for example): - clock rate is always calculated whenever one ask for the current rate (means struct clk has no more a member called "rate"). So switching the PLL base frequency will propagate immediately to all other clocks that are depending on this frequency. Signed-off-by: Juergen Beisert <j.beisert@pengutronix.de>
Diffstat (limited to 'include/asm-arm')
-rw-r--r--include/asm-arm/arch-mxc/clock.h67
1 files changed, 67 insertions, 0 deletions
diff --git a/include/asm-arm/arch-mxc/clock.h b/include/asm-arm/arch-mxc/clock.h
new file mode 100644
index 00000000000..24caa2b7c91
--- /dev/null
+++ b/include/asm-arm/arch-mxc/clock.h
@@ -0,0 +1,67 @@
+/*
+ * Copyright 2005-2007 Freescale Semiconductor, Inc. All Rights Reserved.
+ * Copyright 2008 Juergen Beisert, kernel@pengutronix.de
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+
+#ifndef __ASM_ARCH_MXC_CLOCK_H__
+#define __ASM_ARCH_MXC_CLOCK_H__
+
+#ifndef __ASSEMBLY__
+#include <linux/list.h>
+
+struct module;
+
+struct clk {
+ struct list_head node;
+ struct module *owner;
+ const char *name;
+ int id;
+ /* Source clock this clk depends on */
+ struct clk *parent;
+ /* Secondary clock to enable/disable with this clock */
+ struct clk *secondary;
+ /* Reference count of clock enable/disable */
+ __s8 usecount;
+ /* Register bit position for clock's enable/disable control. */
+ u8 enable_shift;
+ /* Register address for clock's enable/disable control. */
+ u32 enable_reg;
+ u32 flags;
+ /* get the current clock rate (always a fresh value) */
+ unsigned long (*get_rate) (struct clk *);
+ /* Function ptr to set the clock to a new rate. The rate must match a
+ supported rate returned from round_rate. Leave blank if clock is not
+ programmable */
+ int (*set_rate) (struct clk *, unsigned long);
+ /* Function ptr to round the requested clock rate to the nearest
+ supported rate that is less than or equal to the requested rate. */
+ unsigned long (*round_rate) (struct clk *, unsigned long);
+ /* Function ptr to enable the clock. Leave blank if clock can not
+ be gated. */
+ int (*enable) (struct clk *);
+ /* Function ptr to disable the clock. Leave blank if clock can not
+ be gated. */
+ void (*disable) (struct clk *);
+ /* Function ptr to set the parent clock of the clock. */
+ int (*set_parent) (struct clk *, struct clk *);
+};
+
+int clk_register(struct clk *clk);
+void clk_unregister(struct clk *clk);
+
+#endif /* __ASSEMBLY__ */
+#endif /* __ASM_ARCH_MXC_CLOCK_H__ */