287 lines
7.5 KiB
C
287 lines
7.5 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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#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/sbuf.h>
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#include <sys/sysctl.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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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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int
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spibus_detach(device_t dev)
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{
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return (device_delete_children(dev));
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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 += resource_list_print_type(&devi->rl, "irq",
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SYS_RES_IRQ, "%jd");
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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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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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int
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spibus_child_location(device_t bus, device_t child, struct sbuf *sb)
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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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sbuf_printf(sb, "bus=%d cs=%d", device_get_unit(bus), cs);
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return (0);
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}
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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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case SPIBUS_IVAR_CS_DELAY:
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*(uint32_t *)result = devi->cs_delay;
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break;
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}
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return (0);
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}
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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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case SPIBUS_IVAR_CS_DELAY:
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devi->cs_delay = (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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device_t
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spibus_add_child_common(device_t dev, u_int order, const char *name, int unit,
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size_t ivars_size)
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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(ivars_size, 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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resource_list_init(&devi->rl);
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device_set_ivars(child, devi);
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return (child);
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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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return (spibus_add_child_common(
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dev, order, name, unit, sizeof(struct spibus_ivar)));
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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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int irq;
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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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if (resource_int_value(dname, dunit, "irq", &irq) == 0) {
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if (bus_set_resource(child, SYS_RES_IRQ, 0, irq, 1) != 0)
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device_printf(bus,
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"Warning: bus_set_resource() failed\n");
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}
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}
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static struct resource_list *
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spibus_get_resource_list(device_t bus __unused, device_t child)
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{
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struct spibus_ivar *devi;
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devi = SPIBUS_IVAR(child);
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return (&devi->rl);
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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_setup_intr, bus_generic_setup_intr),
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DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
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DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
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DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
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DEVMETHOD(bus_adjust_resource, bus_generic_adjust_resource),
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DEVMETHOD(bus_alloc_resource, bus_generic_rl_alloc_resource),
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DEVMETHOD(bus_release_resource, bus_generic_rl_release_resource),
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DEVMETHOD(bus_get_resource, bus_generic_rl_get_resource),
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DEVMETHOD(bus_set_resource, bus_generic_rl_set_resource),
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DEVMETHOD(bus_get_resource_list, spibus_get_resource_list),
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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_location, spibus_child_location),
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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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DRIVER_MODULE(spibus, spi, spibus_driver, 0, 0);
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MODULE_VERSION(spibus, 1);
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