382 lines
9.5 KiB
C
382 lines
9.5 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2006 M. Warner Losh.
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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 ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* Generic IIC eeprom support, modeled after the AT24C family of products.
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*/
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#include "opt_platform.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/conf.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/resource.h>
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#include <sys/sx.h>
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#include <sys/uio.h>
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#include <machine/bus.h>
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#ifdef FDT
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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#endif
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#include <dev/iicbus/iiconf.h>
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#include <dev/iicbus/iicbus.h>
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#include "iicbus_if.h"
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/*
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* AT24 parts have a "write page size" that differs per-device, and a "read page
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* size" that is always equal to the full device size. We define maximum values
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* here to limit how long we occupy the bus with a single transfer, and because
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* there are temporary buffers of these sizes allocated on the stack.
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*/
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#define MAX_RD_SZ 256 /* Largest read size we support */
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#define MAX_WR_SZ 256 /* Largest write size we support */
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struct icee_softc {
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device_t dev; /* Myself */
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struct cdev *cdev; /* user interface */
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int addr; /* Slave address on the bus */
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int size; /* How big am I? */
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int type; /* What address type 8 or 16 bit? */
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int wr_sz; /* What's the write page size */
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};
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#ifdef FDT
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struct eeprom_desc {
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int type;
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int size;
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int wr_sz;
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const char *name;
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};
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static struct eeprom_desc type_desc[] = {
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{ 8, 128, 8, "AT24C01"},
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{ 8, 256, 8, "AT24C02"},
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{ 8, 512, 16, "AT24C04"},
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{ 8, 1024, 16, "AT24C08"},
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{ 8, 2 * 1024, 16, "AT24C16"},
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{16, 4 * 1024, 32, "AT24C32"},
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{16, 8 * 1024, 32, "AT24C64"},
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{16, 16 * 1024, 64, "AT24C128"},
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{16, 32 * 1024, 64, "AT24C256"},
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{16, 64 * 1024, 128, "AT24C512"},
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{16, 128 * 1024, 256, "AT24CM01"},
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};
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static struct ofw_compat_data compat_data[] = {
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{"atmel,24c01", (uintptr_t)(&type_desc[0])},
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{"atmel,24c02", (uintptr_t)(&type_desc[1])},
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{"atmel,24c04", (uintptr_t)(&type_desc[2])},
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{"atmel,24c08", (uintptr_t)(&type_desc[3])},
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{"atmel,24c16", (uintptr_t)(&type_desc[4])},
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{"atmel,24c32", (uintptr_t)(&type_desc[5])},
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{"atmel,24c64", (uintptr_t)(&type_desc[6])},
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{"atmel,24c128", (uintptr_t)(&type_desc[7])},
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{"atmel,24c256", (uintptr_t)(&type_desc[8])},
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{"atmel,24c512", (uintptr_t)(&type_desc[9])},
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{"atmel,24c1024", (uintptr_t)(&type_desc[10])},
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{NULL, (uintptr_t)NULL},
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};
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#endif
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#define CDEV2SOFTC(dev) ((dev)->si_drv1)
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/* cdev routines */
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static d_open_t icee_open;
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static d_close_t icee_close;
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static d_read_t icee_read;
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static d_write_t icee_write;
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static struct cdevsw icee_cdevsw =
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{
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.d_version = D_VERSION,
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.d_flags = D_TRACKCLOSE,
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.d_open = icee_open,
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.d_close = icee_close,
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.d_read = icee_read,
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.d_write = icee_write
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};
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#ifdef FDT
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static int
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icee_probe(device_t dev)
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{
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struct eeprom_desc *d;
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if (!ofw_bus_status_okay(dev))
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return (ENXIO);
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d = (struct eeprom_desc *)
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ofw_bus_search_compatible(dev, compat_data)->ocd_data;
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if (d == NULL)
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return (ENXIO);
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device_set_desc(dev, d->name);
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return (BUS_PROBE_DEFAULT);
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}
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static void
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icee_init(struct icee_softc *sc)
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{
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struct eeprom_desc *d;
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d = (struct eeprom_desc *)
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ofw_bus_search_compatible(sc->dev, compat_data)->ocd_data;
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if (d == NULL)
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return; /* attach will see sc->size == 0 and return error */
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sc->size = d->size;
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sc->type = d->type;
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sc->wr_sz = d->wr_sz;
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}
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#else /* !FDT */
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static int
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icee_probe(device_t dev)
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{
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device_set_desc(dev, "I2C EEPROM");
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return (BUS_PROBE_NOWILDCARD);
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}
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static void
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icee_init(struct icee_softc *sc)
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{
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const char *dname;
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int dunit;
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dname = device_get_name(sc->dev);
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dunit = device_get_unit(sc->dev);
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resource_int_value(dname, dunit, "size", &sc->size);
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resource_int_value(dname, dunit, "type", &sc->type);
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resource_int_value(dname, dunit, "wr_sz", &sc->wr_sz);
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}
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#endif /* FDT */
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static int
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icee_attach(device_t dev)
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{
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struct icee_softc *sc = device_get_softc(dev);
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sc->dev = dev;
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sc->addr = iicbus_get_addr(dev);
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icee_init(sc);
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if (sc->size == 0 || sc->type == 0 || sc->wr_sz == 0) {
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device_printf(sc->dev, "Missing config data, "
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"these cannot be zero: size %d type %d wr_sz %d\n",
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sc->size, sc->type, sc->wr_sz);
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return (EINVAL);
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}
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if (bootverbose)
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device_printf(dev, "size: %d bytes, addressing: %d-bits\n",
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sc->size, sc->type);
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sc->cdev = make_dev(&icee_cdevsw, device_get_unit(dev), UID_ROOT,
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GID_WHEEL, 0600, "icee%d", device_get_unit(dev));
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if (sc->cdev == NULL) {
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return (ENOMEM);
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}
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sc->cdev->si_drv1 = sc;
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return (0);
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}
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static int
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icee_detach(device_t dev)
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{
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struct icee_softc *sc = device_get_softc(dev);
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destroy_dev(sc->cdev);
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return (0);
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}
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static int
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icee_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
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{
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struct icee_softc *sc;
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sc = CDEV2SOFTC(dev);
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if (device_get_state(sc->dev) < DS_BUSY)
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device_busy(sc->dev);
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return (0);
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}
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static int
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icee_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
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{
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struct icee_softc *sc;
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sc = CDEV2SOFTC(dev);
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device_unbusy(sc->dev);
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return (0);
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}
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static int
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icee_read(struct cdev *dev, struct uio *uio, int ioflag)
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{
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struct icee_softc *sc;
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uint8_t addr[2];
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uint8_t data[MAX_RD_SZ];
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int error, i, len, slave;
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struct iic_msg msgs[2] = {
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{ 0, IIC_M_WR, 1, addr },
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{ 0, IIC_M_RD, 0, data },
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};
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sc = CDEV2SOFTC(dev);
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if (uio->uio_offset == sc->size)
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return (0);
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if (uio->uio_offset > sc->size)
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return (EIO);
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if (sc->type != 8 && sc->type != 16)
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return (EINVAL);
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slave = error = 0;
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while (uio->uio_resid > 0) {
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if (uio->uio_offset >= sc->size)
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break;
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len = MIN(MAX_RD_SZ - (uio->uio_offset & (MAX_RD_SZ - 1)),
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uio->uio_resid);
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switch (sc->type) {
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case 8:
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slave = (uio->uio_offset >> 7) | sc->addr;
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msgs[0].len = 1;
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msgs[1].len = len;
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addr[0] = uio->uio_offset & 0xff;
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break;
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case 16:
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slave = sc->addr | (uio->uio_offset >> 15);
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msgs[0].len = 2;
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msgs[1].len = len;
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addr[0] = (uio->uio_offset >> 8) & 0xff;
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addr[1] = uio->uio_offset & 0xff;
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break;
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}
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for (i = 0; i < 2; i++)
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msgs[i].slave = slave;
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error = iicbus_transfer_excl(sc->dev, msgs, 2, IIC_INTRWAIT);
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if (error) {
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error = iic2errno(error);
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break;
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}
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error = uiomove(data, len, uio);
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if (error)
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break;
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}
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return (error);
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}
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/*
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* Write to the part. We use three transfers here since we're actually
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* doing a write followed by a read to make sure that the write finished.
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* It is easier to encode the dummy read here than to break things up
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* into smaller chunks...
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*/
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static int
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icee_write(struct cdev *dev, struct uio *uio, int ioflag)
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{
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struct icee_softc *sc;
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int error, len, slave, waitlimit;
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uint8_t data[MAX_WR_SZ + 2];
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struct iic_msg wr[1] = {
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{ 0, IIC_M_WR, 0, data },
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};
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struct iic_msg rd[1] = {
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{ 0, IIC_M_RD, 1, data },
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};
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sc = CDEV2SOFTC(dev);
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if (uio->uio_offset >= sc->size)
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return (EIO);
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if (sc->type != 8 && sc->type != 16)
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return (EINVAL);
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slave = error = 0;
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while (uio->uio_resid > 0) {
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if (uio->uio_offset >= sc->size)
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break;
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len = MIN(sc->wr_sz - (uio->uio_offset & (sc->wr_sz - 1)),
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uio->uio_resid);
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switch (sc->type) {
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case 8:
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slave = (uio->uio_offset >> 7) | sc->addr;
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wr[0].len = 1 + len;
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data[0] = uio->uio_offset & 0xff;
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break;
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case 16:
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slave = sc->addr | (uio->uio_offset >> 15);
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wr[0].len = 2 + len;
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data[0] = (uio->uio_offset >> 8) & 0xff;
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data[1] = uio->uio_offset & 0xff;
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break;
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}
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wr[0].slave = slave;
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error = uiomove(data + sc->type / 8, len, uio);
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if (error)
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break;
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error = iicbus_transfer_excl(sc->dev, wr, 1, IIC_INTRWAIT);
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if (error) {
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error = iic2errno(error);
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break;
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}
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/* Read after write to wait for write-done. */
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waitlimit = 10000;
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rd[0].slave = slave;
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do {
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error = iicbus_transfer_excl(sc->dev, rd, 1,
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IIC_INTRWAIT);
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} while (waitlimit-- > 0 && error != 0);
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if (error) {
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error = iic2errno(error);
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break;
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}
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}
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return error;
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}
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static device_method_t icee_methods[] = {
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DEVMETHOD(device_probe, icee_probe),
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DEVMETHOD(device_attach, icee_attach),
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DEVMETHOD(device_detach, icee_detach),
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DEVMETHOD_END
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};
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static driver_t icee_driver = {
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"icee",
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icee_methods,
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sizeof(struct icee_softc),
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};
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static devclass_t icee_devclass;
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DRIVER_MODULE(icee, iicbus, icee_driver, icee_devclass, 0, 0);
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MODULE_VERSION(icee, 1);
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MODULE_DEPEND(icee, iicbus, 1, 1, 1);
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