/* $NetBSD: imx_ccm_fixed_factor.c,v 1.1 2020/12/23 14:42:38 skrll Exp $ */
/*-
* Copyright (c) 2020 Jared McNeill <jmcneill@invisible.ca>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: imx_ccm_fixed_factor.c,v 1.1 2020/12/23 14:42:38 skrll Exp $");
#include <sys/param.h>
#include <sys/bus.h>
#include <dev/clk/clk_backend.h>
#include <arm/nxp/imx_ccm.h>
static u_int
imx_ccm_fixed_factor_get_parent_rate(struct clk *clkp)
{
struct clk *clkp_parent;
clkp_parent = clk_get_parent(clkp);
if (clkp_parent == NULL)
return 0;
return clk_get_rate(clkp_parent);
}
u_int
imx_ccm_fixed_factor_get_rate(struct imx_ccm_softc *sc,
struct imx_ccm_clk *clk)
{
struct imx_ccm_fixed_factor *fixed_factor = &clk->u.fixed_factor;
struct clk *clkp = &clk->base;
KASSERT(clk->type == IMX_CCM_FIXED_FACTOR);
const u_int p_rate = imx_ccm_fixed_factor_get_parent_rate(clkp);
if (p_rate == 0)
return 0;
return (u_int)(((uint64_t)p_rate * fixed_factor->mult) / fixed_factor->div);
}
static int
imx_ccm_fixed_factor_set_parent_rate(struct clk *clkp, u_int rate)
{
struct clk *clkp_parent;
clkp_parent = clk_get_parent(clkp);
if (clkp_parent == NULL)
return ENXIO;
return clk_set_rate(clkp_parent, rate);
}
int
imx_ccm_fixed_factor_set_rate(struct imx_ccm_softc *sc,
struct imx_ccm_clk *clk, u_int rate)
{
struct imx_ccm_fixed_factor *fixed_factor = &clk->u.fixed_factor;
struct clk *clkp = &clk->base;
KASSERT(clk->type == IMX_CCM_FIXED_FACTOR);
rate *= fixed_factor->div;
rate /= fixed_factor->mult;
return imx_ccm_fixed_factor_set_parent_rate(clkp, rate);
}
const char *
imx_ccm_fixed_factor_get_parent(struct imx_ccm_softc *sc,
struct imx_ccm_clk *clk)
{
struct imx_ccm_fixed_factor *fixed_factor = &clk->u.fixed_factor;
KASSERT(clk->type == IMX_CCM_FIXED_FACTOR);
return fixed_factor->parent;
}