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      1 /* $NetBSD: fdt_mmc_pwrseq.c,v 1.2 2018/06/30 20:34:43 jmcneill Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2017 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: fdt_mmc_pwrseq.c,v 1.2 2018/06/30 20:34:43 jmcneill Exp $");
     31 
     32 #include <sys/param.h>
     33 #include <sys/bus.h>
     34 #include <sys/kmem.h>
     35 #include <sys/queue.h>
     36 
     37 #include <libfdt.h>
     38 #include <dev/fdt/fdtvar.h>
     39 
     40 struct fdtbus_mmc_pwrseq {
     41 	device_t mps_dev;
     42 	int mps_phandle;
     43 	const struct fdtbus_mmc_pwrseq_func *mps_funcs;
     44 
     45 	LIST_ENTRY(fdtbus_mmc_pwrseq) mps_next;
     46 };
     47 
     48 static LIST_HEAD(, fdtbus_mmc_pwrseq) fdtbus_mmc_pwrseqs =
     49     LIST_HEAD_INITIALIZER(fdtbus_mmc_pwrseqs);
     50 
     51 int
     52 fdtbus_register_mmc_pwrseq(device_t dev, int phandle,
     53     const struct fdtbus_mmc_pwrseq_func *funcs)
     54 {
     55 	struct fdtbus_mmc_pwrseq *mps;
     56 
     57 	mps = kmem_alloc(sizeof(*mps), KM_SLEEP);
     58 	mps->mps_dev = dev;
     59 	mps->mps_phandle = phandle;
     60 	mps->mps_funcs = funcs;
     61 
     62 	LIST_INSERT_HEAD(&fdtbus_mmc_pwrseqs, mps, mps_next);
     63 
     64 	return 0;
     65 }
     66 
     67 static struct fdtbus_mmc_pwrseq *
     68 fdtbus_get_mmc_pwrseq(int phandle)
     69 {
     70 	struct fdtbus_mmc_pwrseq *mps;
     71 
     72 	LIST_FOREACH(mps, &fdtbus_mmc_pwrseqs, mps_next) {
     73 		if (mps->mps_phandle == phandle)
     74 			return mps;
     75 	}
     76 
     77 	return NULL;
     78 }
     79 
     80 struct fdtbus_mmc_pwrseq *
     81 fdtbus_mmc_pwrseq_get(int phandle)
     82 {
     83 	const u_int *p;
     84 	int mps_phandle;
     85 
     86 	p = fdtbus_get_prop(phandle, "mmc-pwrseq", NULL);
     87 	if (p == NULL)
     88 		return NULL;
     89 
     90 	mps_phandle = fdtbus_get_phandle_from_native(be32toh(p[0]));
     91 	return fdtbus_get_mmc_pwrseq(mps_phandle);
     92 }
     93 
     94 void
     95 fdtbus_mmc_pwrseq_pre_power_on(struct fdtbus_mmc_pwrseq *mps)
     96 {
     97 	if (mps->mps_funcs->pre_power_on)
     98 		mps->mps_funcs->pre_power_on(mps->mps_dev);
     99 }
    100 
    101 void
    102 fdtbus_mmc_pwrseq_post_power_on(struct fdtbus_mmc_pwrseq *mps)
    103 {
    104 	if (mps->mps_funcs->post_power_on)
    105 		mps->mps_funcs->post_power_on(mps->mps_dev);
    106 }
    107 
    108 void
    109 fdtbus_mmc_pwrseq_power_off(struct fdtbus_mmc_pwrseq *mps)
    110 {
    111 	if (mps->mps_funcs->power_off)
    112 		mps->mps_funcs->power_off(mps->mps_dev);
    113 }
    114 
    115 void
    116 fdtbus_mmc_pwrseq_reset(struct fdtbus_mmc_pwrseq *mps)
    117 {
    118 	if (mps->mps_funcs->reset)
    119 		mps->mps_funcs->reset(mps->mps_dev);
    120 }
    121