bbd72acb3b
Some clocks on SoC have a diff between the value written in the register and the real divider. Add a table that where we can lookup the real value of the divider. Reviewed by: mmel (earlier revision) Differential Revision: https://reviews.freebsd.org/D8728
56 lines
2.1 KiB
C
56 lines
2.1 KiB
C
/*-
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* Copyright 2016 Michal Meloun <mmel@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#ifndef _DEV_EXTRES_CLK_DIV_H_
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#define _DEV_EXTRES_CLK_DIV_H_
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#include <dev/extres/clk/clk.h>
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#define CLK_DIV_ZERO_BASED 0x0001 /* Zero based divider. */
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#define CLK_DIV_WITH_TABLE 0x0002 /* Table to lookup the real value */
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struct clk_div_table {
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uint32_t value;
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uint32_t divider;
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};
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struct clk_div_def {
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struct clknode_init_def clkdef;
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uint32_t offset; /* Divider register offset */
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uint32_t i_shift; /* Pos of div bits in reg */
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uint32_t i_width; /* Width of div bit field */
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uint32_t f_shift; /* Fractional divide bits, */
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uint32_t f_width; /* set to 0 for int divider */
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int div_flags; /* Divider-specific flags */
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struct clk_div_table *div_table; /* Divider table */
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};
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int clknode_div_register(struct clkdom *clkdom, struct clk_div_def *clkdef);
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#endif /*_DEV_EXTRES_CLK_DIV_H_*/
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