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imx6_clk.c revision 1.1 
      1 /*	$NetBSD: imx6_clk.c,v 1.1 2020/12/23 14:42:38 skrll Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2019 Genetec Corporation.  All rights reserved.
      5  * Written by Hashimoto Kenichi for Genetec Corporation.
      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: imx6_clk.c,v 1.1 2020/12/23 14:42:38 skrll Exp $");
     31 
     32 #include "opt_fdt.h"
     33 
     34 #include <sys/types.h>
     35 #include <sys/time.h>
     36 #include <sys/bus.h>
     37 #include <sys/device.h>
     38 #include <sys/sysctl.h>
     39 #include <sys/cpufreq.h>
     40 #include <sys/malloc.h>
     41 #include <sys/kmem.h>
     42 #include <sys/param.h>
     43 
     44 #include <arm/nxp/imx6_ccmvar.h>
     45 
     46 #include <dev/clk/clk_backend.h>
     47 #include <dev/fdt/fdtvar.h>
     48 
     49 static struct clk *imx6_clk_decode(device_t, int, const void *, size_t);
     50 
     51 static const struct fdtbus_clock_controller_func imx6_ccm_fdtclock_funcs = {
     52 	.decode = imx6_clk_decode
     53 };
     54 
     55 static struct clk *
     56 imx6_clk_decode(device_t dev, int cc_phandle, const void *data, size_t len)
     57 {
     58 	struct clk *clk;
     59 
     60 	/* #clock-cells should be 1 */
     61 	if (len != 4)
     62 		return NULL;
     63 
     64 	const u_int clock_id = be32dec(data);
     65 
     66 	clk = imx6_get_clock_by_id(clock_id);
     67 	if (clk)
     68 		return clk;
     69 
     70 	return NULL;
     71 }
     72 
     73 static void
     74 imx6_clk_fixed_from_fdt(const char *name)
     75 {
     76 	struct imx6_clk *iclk = (struct imx6_clk *)imx6_get_clock(name);
     77 
     78 	KASSERT(iclk != NULL);
     79 
     80 	char *path = kmem_asprintf("/clocks/%s", name);
     81 	int phandle = OF_finddevice(path);
     82 	kmem_free(path, strlen(path) + 1);
     83 
     84 	if (of_getprop_uint32(phandle, "clock-frequency", &iclk->clk.fixed.rate) != 0)
     85 		iclk->clk.fixed.rate = 0;
     86 }
     87 
     88 static int imx6ccm_match(device_t, cfdata_t, void *);
     89 static void imx6ccm_attach(device_t, device_t, void *);
     90 
     91 CFATTACH_DECL_NEW(imx6ccm, sizeof(struct imx6ccm_softc),
     92     imx6ccm_match, imx6ccm_attach, NULL, NULL);
     93 
     94 static int
     95 imx6ccm_match(device_t parent, cfdata_t cfdata, void *aux)
     96 {
     97 	const char * const compatible[] = { "fsl,imx6q-ccm", NULL };
     98 	struct fdt_attach_args * const faa = aux;
     99 
    100 	return of_match_compatible(faa->faa_phandle, compatible);
    101 }
    102 
    103 static void
    104 imx6ccm_attach(device_t parent, device_t self, void *aux)
    105 {
    106 	struct imx6ccm_softc * const sc = device_private(self);
    107 	struct fdt_attach_args * const faa = aux;
    108 	bus_addr_t addr;
    109 	bus_size_t size;
    110 
    111 	if (fdtbus_get_reg(faa->faa_phandle, 0, &addr, &size) != 0) {
    112 		aprint_error(": couldn't get registers\n");
    113 		return;
    114 	}
    115 
    116 	sc->sc_dev = self;
    117 	sc->sc_iot = faa->faa_bst;
    118 
    119 	if (bus_space_map(sc->sc_iot, addr, size, 0, &sc->sc_ioh)) {
    120 		aprint_error(": can't map ccm registers\n");
    121 		return;
    122 	}
    123 
    124 	int phandle = OF_finddevice("/soc/aips-bus/anatop");
    125 	fdtbus_get_reg(phandle, 0, &addr, &size);
    126 
    127 	if (bus_space_map(sc->sc_iot, addr, size, 0, &sc->sc_ioh_analog)) {
    128 		aprint_error(": can't map anatop registers\n");
    129 		return;
    130 	}
    131 
    132 	imx6ccm_attach_common(self);
    133 
    134 	aprint_naive("\n");
    135 	aprint_normal(": Clock Control Module\n");
    136 
    137 	imx6_clk_fixed_from_fdt("ckil");
    138 	imx6_clk_fixed_from_fdt("ckih");
    139 	imx6_clk_fixed_from_fdt("osc");
    140 	imx6_clk_fixed_from_fdt("anaclk1");
    141 	imx6_clk_fixed_from_fdt("anaclk2");
    142 
    143 	fdtbus_register_clock_controller(self, faa->faa_phandle,
    144 	    &imx6_ccm_fdtclock_funcs);
    145 }
    146 
    147