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fdt_spi.c revision 1.6 
      1 /* $NetBSD: fdt_spi.c,v 1.6 2025/09/10 03:16:57 thorpej Exp $ */
      2 
      3 /*
      4  * Copyright (c) 2019 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Tobias Nygren.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 __KERNEL_RCSID(0, "$NetBSD: fdt_spi.c,v 1.6 2025/09/10 03:16:57 thorpej Exp $");
     34 
     35 #include <sys/param.h>
     36 #include <sys/device.h>
     37 #include <sys/bus.h>
     38 #include <sys/kmem.h>
     39 #include <sys/queue.h>
     40 #include <dev/spi/spivar.h>
     41 #include <libfdt.h>
     42 #include <dev/fdt/fdtvar.h>
     43 
     44 struct fdtbus_spi_controller {
     45 	device_t spi_dev;
     46 	struct spi_controller *spi_controller;
     47 	LIST_ENTRY(fdtbus_spi_controller) spi_next;
     48 };
     49 
     50 static LIST_HEAD(, fdtbus_spi_controller) fdtbus_spi_controllers =
     51     LIST_HEAD_INITIALIZER(fdtbus_spi_controllers);
     52 
     53 int
     54 fdtbus_register_spi_controller(device_t dev,
     55     struct spi_controller *controller)
     56 {
     57 	struct fdtbus_spi_controller *spi;
     58 
     59 	spi = kmem_alloc(sizeof(*spi), KM_SLEEP);
     60 	spi->spi_dev = dev;
     61 	spi->spi_controller = controller;
     62 
     63 	LIST_INSERT_HEAD(&fdtbus_spi_controllers, spi, spi_next);
     64 
     65 	return 0;
     66 }
     67 
     68 static struct spi_controller *
     69 fdtbus_get_spi_controller(int phandle)
     70 {
     71 	struct fdtbus_spi_controller *spi;
     72 
     73 	LIST_FOREACH(spi, &fdtbus_spi_controllers, spi_next) {
     74 		if (phandle ==
     75 		    devhandle_to_of(device_handle(spi->spi_dev))) {
     76 			return spi->spi_controller;
     77 		}
     78 	}
     79 	return NULL;
     80 }
     81 
     82 device_t
     83 fdtbus_attach_spibus(device_t dev, cfprint_t print)
     84 {
     85 	struct spi_controller *spi;
     86 	int phandle = devhandle_to_of(device_handle(dev));
     87 	struct spibus_attach_args sba;
     88 	prop_dictionary_t devs;
     89 	device_t ret;
     90 	u_int address_cells;
     91 
     92 	devs = prop_dictionary_create();
     93 	if (of_getprop_uint32(phandle, "#address-cells", &address_cells))
     94 		address_cells = 1;
     95 	of_enter_spi_devs(devs, phandle, address_cells * 4);
     96 
     97 	spi = fdtbus_get_spi_controller(phandle);
     98 	KASSERT(spi != NULL);
     99 	memset(&sba, 0, sizeof(sba));
    100 	sba.sba_controller = spi;
    101 
    102 	sba.sba_child_devices = prop_dictionary_get(devs, "spi-child-devices");
    103 	if (sba.sba_child_devices)
    104 		prop_object_retain(sba.sba_child_devices);
    105 	prop_object_release(devs);
    106 
    107 	ret = config_found(dev, &sba, print,
    108 	    CFARGS(.iattr = "spibus",
    109 		   .devhandle = device_handle(dev)));
    110 	if (sba.sba_child_devices)
    111 		prop_object_release(sba.sba_child_devices);
    112 
    113 	return ret;
    114 }
    115