f86e60008b
o Remove All Rights Reserved from my notices o imp@FreeBSD.org everywhere o regularize punctiation, eliminate date ranges o Make sure that it's clear that I don't claim All Rights reserved by listing All Rights Reserved on same line as other copyright holders (but not me). Other such holders are also listed last where it's clear.
264 lines
6.5 KiB
C
264 lines
6.5 KiB
C
/*-
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* Copyright (c) 2006 M. Warner Losh <imp@FreeBSD.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/kernel.h>
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#include <sys/queue.h>
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#include <sys/sysctl.h>
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#include <sys/types.h>
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#include <sys/bus.h>
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#include <machine/bus.h>
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#include <sys/rman.h>
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#include <machine/resource.h>
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#include <dev/spibus/spibusvar.h>
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#include <dev/spibus/spi.h>
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#include "spibus_if.h"
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static int
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spibus_probe(device_t dev)
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{
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device_set_desc(dev, "SPI bus");
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return (BUS_PROBE_DEFAULT);
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}
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static int
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spibus_attach(device_t dev)
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{
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struct spibus_softc *sc = SPIBUS_SOFTC(dev);
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sc->dev = dev;
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bus_enumerate_hinted_children(dev);
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return (bus_generic_attach(dev));
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}
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/*
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* Since this is not a self-enumerating bus, and since we always add
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* children in attach, we have to always delete children here.
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*/
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static int
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spibus_detach(device_t dev)
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{
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int err;
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if ((err = bus_generic_detach(dev)) != 0)
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return (err);
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device_delete_children(dev);
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return (0);
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}
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static int
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spibus_suspend(device_t dev)
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{
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return (bus_generic_suspend(dev));
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}
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static
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int
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spibus_resume(device_t dev)
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{
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return (bus_generic_resume(dev));
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}
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static int
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spibus_print_child(device_t dev, device_t child)
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{
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struct spibus_ivar *devi = SPIBUS_IVAR(child);
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int retval = 0;
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retval += bus_print_child_header(dev, child);
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retval += printf(" at cs %d", devi->cs);
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retval += printf(" mode %d", devi->mode);
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retval += bus_print_child_footer(dev, child);
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return (retval);
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}
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static void
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spibus_probe_nomatch(device_t bus, device_t child)
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{
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struct spibus_ivar *devi = SPIBUS_IVAR(child);
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device_printf(bus, "<unknown card> at cs %d mode %d\n", devi->cs,
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devi->mode);
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return;
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}
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static int
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spibus_child_location_str(device_t bus, device_t child, char *buf,
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size_t buflen)
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{
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struct spibus_ivar *devi = SPIBUS_IVAR(child);
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int cs;
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cs = devi->cs & ~SPIBUS_CS_HIGH; /* trim 'cs high' bit */
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snprintf(buf, buflen, "bus=%d cs=%d", device_get_unit(bus), cs);
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return (0);
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}
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static int
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spibus_child_pnpinfo_str(device_t bus, device_t child, char *buf,
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size_t buflen)
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{
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*buf = '\0';
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return (0);
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}
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static int
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spibus_read_ivar(device_t bus, device_t child, int which, uintptr_t *result)
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{
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struct spibus_ivar *devi = SPIBUS_IVAR(child);
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switch (which) {
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default:
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return (EINVAL);
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case SPIBUS_IVAR_CS:
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*(uint32_t *)result = devi->cs;
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break;
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case SPIBUS_IVAR_MODE:
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*(uint32_t *)result = devi->mode;
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break;
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case SPIBUS_IVAR_CLOCK:
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*(uint32_t *)result = devi->clock;
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break;
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}
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return (0);
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}
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static int
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spibus_write_ivar(device_t bus, device_t child, int which, uintptr_t value)
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{
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struct spibus_ivar *devi = SPIBUS_IVAR(child);
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if (devi == NULL || device_get_parent(child) != bus)
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return (EDOOFUS);
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switch (which) {
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case SPIBUS_IVAR_CLOCK:
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/* Any non-zero value is allowed for max clock frequency. */
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if (value == 0)
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return (EINVAL);
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devi->clock = (uint32_t)value;
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break;
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case SPIBUS_IVAR_CS:
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/* Chip select cannot be changed. */
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return (EINVAL);
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case SPIBUS_IVAR_MODE:
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/* Valid SPI modes are 0-3. */
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if (value > 3)
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return (EINVAL);
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devi->mode = (uint32_t)value;
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break;
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default:
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return (EINVAL);
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}
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return (0);
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}
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static device_t
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spibus_add_child(device_t dev, u_int order, const char *name, int unit)
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{
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device_t child;
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struct spibus_ivar *devi;
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child = device_add_child_ordered(dev, order, name, unit);
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if (child == NULL)
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return (child);
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devi = malloc(sizeof(struct spibus_ivar), M_DEVBUF, M_NOWAIT | M_ZERO);
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if (devi == NULL) {
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device_delete_child(dev, child);
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return (0);
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}
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device_set_ivars(child, devi);
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return (child);
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}
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static void
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spibus_hinted_child(device_t bus, const char *dname, int dunit)
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{
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device_t child;
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struct spibus_ivar *devi;
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child = BUS_ADD_CHILD(bus, 0, dname, dunit);
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devi = SPIBUS_IVAR(child);
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devi->mode = SPIBUS_MODE_NONE;
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resource_int_value(dname, dunit, "clock", &devi->clock);
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resource_int_value(dname, dunit, "cs", &devi->cs);
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resource_int_value(dname, dunit, "mode", &devi->mode);
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}
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static int
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spibus_transfer_impl(device_t dev, device_t child, struct spi_command *cmd)
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{
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return (SPIBUS_TRANSFER(device_get_parent(dev), child, cmd));
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}
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static device_method_t spibus_methods[] = {
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/* Device interface */
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DEVMETHOD(device_probe, spibus_probe),
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DEVMETHOD(device_attach, spibus_attach),
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DEVMETHOD(device_detach, spibus_detach),
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DEVMETHOD(device_shutdown, bus_generic_shutdown),
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DEVMETHOD(device_suspend, spibus_suspend),
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DEVMETHOD(device_resume, spibus_resume),
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/* Bus interface */
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DEVMETHOD(bus_add_child, spibus_add_child),
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DEVMETHOD(bus_print_child, spibus_print_child),
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DEVMETHOD(bus_probe_nomatch, spibus_probe_nomatch),
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DEVMETHOD(bus_read_ivar, spibus_read_ivar),
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DEVMETHOD(bus_write_ivar, spibus_write_ivar),
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DEVMETHOD(bus_child_pnpinfo_str, spibus_child_pnpinfo_str),
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DEVMETHOD(bus_child_location_str, spibus_child_location_str),
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DEVMETHOD(bus_hinted_child, spibus_hinted_child),
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/* spibus interface */
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DEVMETHOD(spibus_transfer, spibus_transfer_impl),
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DEVMETHOD_END
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};
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driver_t spibus_driver = {
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"spibus",
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spibus_methods,
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sizeof(struct spibus_softc)
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};
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devclass_t spibus_devclass;
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DRIVER_MODULE(spibus, spi, spibus_driver, spibus_devclass, 0, 0);
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MODULE_VERSION(spibus, 1);
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