1 /* $NetBSD: fdt_spi.c,v 1.3 2021/08/07 16:19:10 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 1.3 2021/08/07 16:19:10 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 int spi_phandle; 47 const struct fdtbus_spi_controller_func *spi_funcs; 48 LIST_ENTRY(fdtbus_spi_controller) spi_next; 49 }; 50 51 static LIST_HEAD(, fdtbus_spi_controller) fdtbus_spi_controllers = 52 LIST_HEAD_INITIALIZER(fdtbus_spi_controllers); 53 54 int 55 fdtbus_register_spi_controller(device_t dev, int phandle, 56 const struct fdtbus_spi_controller_func *funcs) 57 { 58 struct fdtbus_spi_controller *spi; 59 60 spi = kmem_alloc(sizeof(*spi), KM_SLEEP); 61 spi->spi_dev = dev; 62 spi->spi_phandle = phandle; 63 spi->spi_funcs = funcs; 64 65 LIST_INSERT_HEAD(&fdtbus_spi_controllers, spi, spi_next); 66 67 return 0; 68 } 69 70 static struct spi_controller * 71 fdtbus_get_spi_controller(int phandle) 72 { 73 struct fdtbus_spi_controller *spi; 74 75 LIST_FOREACH(spi, &fdtbus_spi_controllers, spi_next) { 76 if (spi->spi_phandle == phandle) { 77 return spi->spi_funcs->get_controller(spi->spi_dev); 78 } 79 } 80 return NULL; 81 } 82 83 device_t 84 fdtbus_attach_spibus(device_t dev, int phandle, cfprint_t print) 85 { 86 struct spi_controller *spi; 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 if (sba.sba_child_devices) 110 prop_object_release(sba.sba_child_devices); 111 112 return ret; 113 } 114 115 116