Home | History | Annotate | Line # | Download | only in nxp 
      1 /* $NetBSD: imx_ccm_extclk.c,v 1.1 2020/12/23 14:42:38 skrll Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2020 Jared McNeill <jmcneill (at) invisible.ca>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     17  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     18  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     19  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     20  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     21  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     22  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     23  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     24  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: imx_ccm_extclk.c,v 1.1 2020/12/23 14:42:38 skrll Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/bus.h>
     34 
     35 #include <dev/clk/clk_backend.h>
     36 
     37 #include <arm/nxp/imx_ccm.h>
     38 
     39 #include <dev/fdt/fdtvar.h>
     40 
     41 int
     42 imx_ccm_extclk_enable(struct imx_ccm_softc *sc, struct imx_ccm_clk *clk,
     43     int enable)
     44 {
     45 	struct clk *extclk;
     46 
     47 	KASSERT(clk->type == IMX_CCM_EXTCLK);
     48 
     49 	if ((extclk = fdtbus_clock_byname(clk->u.extclk)) == NULL)
     50 		return ENXIO;
     51 
     52 	return clk_enable(extclk);
     53 }
     54 
     55 u_int
     56 imx_ccm_extclk_get_rate(struct imx_ccm_softc *sc,
     57     struct imx_ccm_clk *clk)
     58 {
     59 	struct clk *extclk;
     60 
     61 	KASSERT(clk->type == IMX_CCM_EXTCLK);
     62 
     63 	if ((extclk = fdtbus_clock_byname(clk->u.extclk)) == NULL)
     64 		return 0;
     65 
     66 	return clk_get_rate(extclk);
     67 }
     68 
     69 int
     70 imx_ccm_extclk_set_rate(struct imx_ccm_softc *sc,
     71     struct imx_ccm_clk *clk, u_int rate)
     72 {
     73 	struct clk *extclk;
     74 
     75 	KASSERT(clk->type == IMX_CCM_EXTCLK);
     76 
     77 	if ((extclk = fdtbus_clock_byname(clk->u.extclk)) == NULL)
     78 		return ENXIO;
     79 
     80 	return clk_set_rate(extclk, rate);
     81 }
     82 
     83 const char *
     84 imx_ccm_extclk_get_parent(struct imx_ccm_softc *sc,
     85     struct imx_ccm_clk *clk)
     86 {
     87 	struct clk *extclk, *clkp;
     88 
     89 	KASSERT(clk->type == IMX_CCM_EXTCLK);
     90 
     91 	if ((extclk = fdtbus_clock_byname(clk->u.extclk)) == NULL)
     92 		return NULL;
     93 
     94 	clkp = clk_get_parent(extclk);
     95 	if (clkp == NULL)
     96 		return NULL;
     97 
     98 	return clkp->name;
     99 }
    100