spibus.c revision 332942
1278957Simp/*- 2278957Simp * Copyright (c) 2006 M. Warner Losh 3278957Simp * All rights reserved. 4278957Simp * 5278957Simp * Redistribution and use in source and binary forms, with or without 6278957Simp * modification, are permitted provided that the following conditions 7278957Simp * are met: 8278957Simp * 1. Redistributions of source code must retain the above copyright 9278957Simp * notice, this list of conditions and the following disclaimer. 10278957Simp * 2. Redistributions in binary form must reproduce the above copyright 11278957Simp * notice, this list of conditions and the following disclaimer in the 12278957Simp * documentation and/or other materials provided with the distribution. 13278957Simp * 14278957Simp * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15278957Simp * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16278957Simp * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17278957Simp * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18278957Simp * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19278957Simp * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20278957Simp * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21278957Simp * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22278957Simp * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23278957Simp * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24278957Simp * SUCH DAMAGE. 25278957Simp * 26278957Simp */ 27278957Simp 28160370Simp#include <sys/cdefs.h> 29160370Simp__FBSDID("$FreeBSD: stable/11/sys/dev/spibus/spibus.c 332942 2018-04-24 17:00:08Z ian $"); 30160370Simp 31160370Simp#include <sys/param.h> 32160370Simp#include <sys/systm.h> 33160370Simp#include <sys/malloc.h> 34160370Simp#include <sys/module.h> 35160370Simp#include <sys/kernel.h> 36160370Simp#include <sys/queue.h> 37160370Simp#include <sys/sysctl.h> 38160370Simp#include <sys/types.h> 39160370Simp 40160370Simp#include <sys/bus.h> 41160370Simp#include <machine/bus.h> 42160370Simp#include <sys/rman.h> 43160370Simp#include <machine/resource.h> 44160370Simp 45160370Simp#include <dev/spibus/spibusvar.h> 46160370Simp#include <dev/spibus/spi.h> 47160370Simp#include "spibus_if.h" 48160370Simp 49160370Simpstatic int 50160370Simpspibus_probe(device_t dev) 51160370Simp{ 52332942Sian 53332942Sian device_set_desc(dev, "SPI bus"); 54332942Sian return (BUS_PROBE_DEFAULT); 55160370Simp} 56160370Simp 57160370Simpstatic int 58160370Simpspibus_attach(device_t dev) 59160370Simp{ 60160370Simp struct spibus_softc *sc = SPIBUS_SOFTC(dev); 61160370Simp 62160370Simp sc->dev = dev; 63160370Simp bus_enumerate_hinted_children(dev); 64160370Simp return (bus_generic_attach(dev)); 65160370Simp} 66160370Simp 67160370Simp/* 68160370Simp * Since this is not a self-enumerating bus, and since we always add 69160370Simp * children in attach, we have to always delete children here. 70160370Simp */ 71160370Simpstatic int 72160370Simpspibus_detach(device_t dev) 73160370Simp{ 74332942Sian int err; 75160370Simp 76160370Simp if ((err = bus_generic_detach(dev)) != 0) 77160370Simp return (err); 78332942Sian device_delete_children(dev); 79160370Simp 80160370Simp return (0); 81160370Simp} 82160370Simp 83160370Simpstatic int 84160370Simpspibus_suspend(device_t dev) 85160370Simp{ 86160370Simp return (bus_generic_suspend(dev)); 87160370Simp} 88160370Simp 89160370Simpstatic 90160370Simpint 91160370Simpspibus_resume(device_t dev) 92160370Simp{ 93160370Simp return (bus_generic_resume(dev)); 94160370Simp} 95160370Simp 96160370Simpstatic int 97160370Simpspibus_print_child(device_t dev, device_t child) 98160370Simp{ 99160370Simp struct spibus_ivar *devi = SPIBUS_IVAR(child); 100160370Simp int retval = 0; 101160370Simp 102160370Simp retval += bus_print_child_header(dev, child); 103160370Simp retval += printf(" at cs %d", devi->cs); 104300710Sadrian retval += printf(" mode %d", devi->mode); 105160370Simp retval += bus_print_child_footer(dev, child); 106160370Simp 107160370Simp return (retval); 108160370Simp} 109160370Simp 110160370Simpstatic void 111160370Simpspibus_probe_nomatch(device_t bus, device_t child) 112160370Simp{ 113160370Simp struct spibus_ivar *devi = SPIBUS_IVAR(child); 114160370Simp 115315329Smizhka device_printf(bus, "<unknown card> at cs %d mode %d\n", devi->cs, 116315329Smizhka devi->mode); 117160370Simp return; 118160370Simp} 119160370Simp 120160370Simpstatic int 121160370Simpspibus_child_location_str(device_t bus, device_t child, char *buf, 122160370Simp size_t buflen) 123160370Simp{ 124160370Simp struct spibus_ivar *devi = SPIBUS_IVAR(child); 125160370Simp 126160370Simp snprintf(buf, buflen, "cs=%d", devi->cs); 127160370Simp return (0); 128160370Simp} 129160370Simp 130160370Simpstatic int 131160370Simpspibus_child_pnpinfo_str(device_t bus, device_t child, char *buf, 132160370Simp size_t buflen) 133160370Simp{ 134160370Simp *buf = '\0'; 135160370Simp return (0); 136160370Simp} 137160370Simp 138160370Simpstatic int 139298651Sbrspibus_read_ivar(device_t bus, device_t child, int which, uintptr_t *result) 140160370Simp{ 141160370Simp struct spibus_ivar *devi = SPIBUS_IVAR(child); 142160370Simp 143160370Simp switch (which) { 144160370Simp default: 145160370Simp return (EINVAL); 146160370Simp case SPIBUS_IVAR_CS: 147160370Simp *(uint32_t *)result = devi->cs; 148160370Simp break; 149300710Sadrian case SPIBUS_IVAR_MODE: 150300710Sadrian *(uint32_t *)result = devi->mode; 151300710Sadrian break; 152300710Sadrian case SPIBUS_IVAR_CLOCK: 153300710Sadrian *(uint32_t *)result = devi->clock; 154300711Sadrian break; 155160370Simp } 156160370Simp return (0); 157160370Simp} 158160370Simp 159332942Sianstatic int 160332942Sianspibus_write_ivar(device_t bus, device_t child, int which, uintptr_t value) 161332942Sian{ 162332942Sian struct spibus_ivar *devi = SPIBUS_IVAR(child); 163332942Sian 164332942Sian if (devi == NULL || device_get_parent(child) != bus) 165332942Sian return (EDOOFUS); 166332942Sian 167332942Sian switch (which) { 168332942Sian case SPIBUS_IVAR_CLOCK: 169332942Sian /* Any non-zero value is allowed for max clock frequency. */ 170332942Sian if (value == 0) 171332942Sian return (EINVAL); 172332942Sian devi->clock = (uint32_t)value; 173332942Sian break; 174332942Sian case SPIBUS_IVAR_CS: 175332942Sian /* Chip select cannot be changed. */ 176332942Sian return (EINVAL); 177332942Sian case SPIBUS_IVAR_MODE: 178332942Sian /* Valid SPI modes are 0-3. */ 179332942Sian if (value > 3) 180332942Sian return (EINVAL); 181332942Sian devi->mode = (uint32_t)value; 182332942Sian break; 183332942Sian default: 184332942Sian return (EINVAL); 185332942Sian } 186332942Sian 187332942Sian return (0); 188332942Sian} 189332942Sian 190160370Simpstatic device_t 191212413Savgspibus_add_child(device_t dev, u_int order, const char *name, int unit) 192160370Simp{ 193160370Simp device_t child; 194160370Simp struct spibus_ivar *devi; 195160370Simp 196160370Simp child = device_add_child_ordered(dev, order, name, unit); 197160370Simp if (child == NULL) 198160370Simp return (child); 199160370Simp devi = malloc(sizeof(struct spibus_ivar), M_DEVBUF, M_NOWAIT | M_ZERO); 200163527Simp if (devi == NULL) { 201163527Simp device_delete_child(dev, child); 202160370Simp return (0); 203163527Simp } 204160370Simp device_set_ivars(child, devi); 205160370Simp return (child); 206160370Simp} 207160370Simp 208160370Simpstatic void 209160370Simpspibus_hinted_child(device_t bus, const char *dname, int dunit) 210160370Simp{ 211160370Simp device_t child; 212160370Simp struct spibus_ivar *devi; 213160370Simp 214160370Simp child = BUS_ADD_CHILD(bus, 0, dname, dunit); 215160370Simp devi = SPIBUS_IVAR(child); 216300710Sadrian devi->mode = SPIBUS_MODE_NONE; 217160370Simp resource_int_value(dname, dunit, "cs", &devi->cs); 218300710Sadrian resource_int_value(dname, dunit, "mode", &devi->mode); 219160370Simp} 220160370Simp 221160370Simpstatic int 222160370Simpspibus_transfer_impl(device_t dev, device_t child, struct spi_command *cmd) 223160370Simp{ 224163527Simp return (SPIBUS_TRANSFER(device_get_parent(dev), child, cmd)); 225160370Simp} 226160370Simp 227160370Simpstatic device_method_t spibus_methods[] = { 228160370Simp /* Device interface */ 229160370Simp DEVMETHOD(device_probe, spibus_probe), 230160370Simp DEVMETHOD(device_attach, spibus_attach), 231160370Simp DEVMETHOD(device_detach, spibus_detach), 232160370Simp DEVMETHOD(device_shutdown, bus_generic_shutdown), 233160370Simp DEVMETHOD(device_suspend, spibus_suspend), 234160370Simp DEVMETHOD(device_resume, spibus_resume), 235160370Simp 236160370Simp /* Bus interface */ 237160370Simp DEVMETHOD(bus_add_child, spibus_add_child), 238160370Simp DEVMETHOD(bus_print_child, spibus_print_child), 239160370Simp DEVMETHOD(bus_probe_nomatch, spibus_probe_nomatch), 240160370Simp DEVMETHOD(bus_read_ivar, spibus_read_ivar), 241332942Sian DEVMETHOD(bus_write_ivar, spibus_write_ivar), 242160370Simp DEVMETHOD(bus_child_pnpinfo_str, spibus_child_pnpinfo_str), 243160370Simp DEVMETHOD(bus_child_location_str, spibus_child_location_str), 244160370Simp DEVMETHOD(bus_hinted_child, spibus_hinted_child), 245160370Simp 246160370Simp /* spibus interface */ 247160370Simp DEVMETHOD(spibus_transfer, spibus_transfer_impl), 248160370Simp 249227843Smarius DEVMETHOD_END 250160370Simp}; 251160370Simp 252257064Sloosdriver_t spibus_driver = { 253160370Simp "spibus", 254160370Simp spibus_methods, 255160370Simp sizeof(struct spibus_softc) 256160370Simp}; 257160370Simp 258160370Simpdevclass_t spibus_devclass; 259160370Simp 260192059SgonzoDRIVER_MODULE(spibus, spi, spibus_driver, spibus_devclass, 0, 0); 261160370SimpMODULE_VERSION(spibus, 1); 262