freebsd-nq/sys/dev/powermac_nvram/powermac_nvram.c

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/*
* Copyright (c) 2006 Maxim Sobolev <sobomax@FreeBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/uio.h>
#include <dev/ofw/openfirm.h>
#include <dev/ofw/ofw_pci.h>
#include <machine/bus.h>
#include <machine/md_var.h>
#include <machine/nexusvar.h>
#include <machine/pio.h>
#include <machine/resource.h>
#include <sys/rman.h>
#include <powerpc/ofw/ofw_pci.h>
#include <dev/powermac_nvram/powermac_nvramvar.h>
#include <vm/vm.h>
#include <vm/pmap.h>
/*
* Device interface.
*/
static int powermac_nvram_probe(device_t);
static int powermac_nvram_attach(device_t);
static int powermac_nvram_detach(device_t);
/* Helper functions */
static int powermac_nvram_check(void *data);
static int chrp_checksum(int sum, uint8_t *, uint8_t *);
static uint32_t adler_checksum(uint8_t *, int);
static int erase_bank(device_t, uint8_t *);
static int write_bank(device_t, uint8_t *, uint8_t *);
/*
* Driver methods.
*/
static device_method_t powermac_nvram_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, powermac_nvram_probe),
DEVMETHOD(device_attach, powermac_nvram_attach),
DEVMETHOD(device_detach, powermac_nvram_detach),
{ 0, 0 }
};
static driver_t powermac_nvram_driver = {
"powermac_nvram",
powermac_nvram_methods,
sizeof(struct powermac_nvram_softc)
};
static devclass_t powermac_nvram_devclass;
DRIVER_MODULE(powermac_nvram, nexus, powermac_nvram_driver, powermac_nvram_devclass, 0, 0);
/*
* Cdev methods.
*/
#define NVRAM_UNIT(dev) dev2unit(dev)
#define NVRAM_SOFTC(unit) ((struct powermac_nvram_softc *) \
devclass_get_softc(powermac_nvram_devclass, unit))
static d_open_t powermac_nvram_open;
static d_close_t powermac_nvram_close;
static d_read_t powermac_nvram_read;
static d_write_t powermac_nvram_write;
static struct cdevsw powermac_nvram_cdevsw = {
.d_version = D_VERSION,
.d_flags = D_NEEDGIANT,
.d_open = powermac_nvram_open,
.d_close = powermac_nvram_close,
.d_read = powermac_nvram_read,
.d_write = powermac_nvram_write,
.d_name = "powermac_nvram",
};
static int
powermac_nvram_probe(device_t dev)
{
char *type, *compatible;
type = nexus_get_device_type(dev);
compatible = nexus_get_compatible(dev);
if (type == NULL || compatible == NULL)
return ENXIO;
if (strcmp(type, "nvram") != 0 || strcmp(compatible, "amd-0137") != 0)
return ENXIO;
device_set_desc(dev, "Apple NVRAM");
return 0;
}
static int
powermac_nvram_attach(device_t dev)
{
struct powermac_nvram_softc *sc;
phandle_t node;
u_int32_t reg[2];
int gen0, gen1;
node = nexus_get_node(dev);
sc = device_get_softc(dev);
if (OF_getprop(node, "reg", reg, sizeof(reg)) < 8)
return ENXIO;
sc->sc_dev = dev;
sc->sc_node = node;
sc->sc_bank0 = (vm_offset_t)pmap_mapdev(reg[0], NVRAM_SIZE * 2);
sc->sc_bank1 = sc->sc_bank0 + NVRAM_SIZE;
gen0 = powermac_nvram_check((void *)sc->sc_bank0);
gen1 = powermac_nvram_check((void *)sc->sc_bank1);
if (gen0 == -1 && gen1 == -1) {
if ((void *)sc->sc_bank0 != NULL)
pmap_unmapdev(sc->sc_bank0, NVRAM_SIZE * 2);
device_printf(dev, "both banks appear to be corrupt\n");
return ENXIO;
}
device_printf(dev, "bank0 generation %d, bank1 generation %d\n",
gen0, gen1);
sc->sc_bank = (gen0 > gen1) ? sc->sc_bank0 : sc->sc_bank1;
bcopy((void *)sc->sc_bank, (void *)sc->sc_data, NVRAM_SIZE);
sc->sc_cdev = make_dev(&powermac_nvram_cdevsw, 0, 0, 0, 0600,
"powermac_nvram");
return 0;
}
static int
powermac_nvram_detach(device_t dev)
{
struct powermac_nvram_softc *sc;
sc = device_get_softc(dev);
if ((void *)sc->sc_bank0 != NULL)
pmap_unmapdev(sc->sc_bank0, NVRAM_SIZE * 2);
if (sc->sc_cdev != NULL)
destroy_dev(sc->sc_cdev);
return 0;
}
static int
powermac_nvram_open(struct cdev *dev, int flags, int fmt, struct thread *td)
{
struct powermac_nvram_softc *sc;
sc = NVRAM_SOFTC(NVRAM_UNIT(dev));
if (sc->sc_isopen)
return EBUSY;
sc->sc_isopen = 1;
sc->sc_rpos = sc->sc_wpos = 0;
return 0;
}
static int
powermac_nvram_close(struct cdev *dev, int fflag, int devtype, struct thread *td)
{
struct powermac_nvram_softc *sc;
struct core99_header *header;
vm_offset_t bank;
sc = NVRAM_SOFTC(NVRAM_UNIT(dev));
if (sc->sc_wpos != sizeof(sc->sc_data)) {
/* Short write, restore in-memory copy */
bcopy((void *)sc->sc_bank, (void *)sc->sc_data, NVRAM_SIZE);
sc->sc_isopen = 0;
return 0;
}
header = (struct core99_header *)sc->sc_data;
header->generation = ((struct core99_header *)sc->sc_bank)->generation;
header->generation++;
header->chrp_header.signature = CORE99_SIGNATURE;
header->adler_checksum =
adler_checksum((uint8_t *)&(header->generation),
NVRAM_SIZE - offsetof(struct core99_header, generation));
header->chrp_header.chrp_checksum = chrp_checksum(header->chrp_header.signature,
(uint8_t *)&(header->chrp_header.length),
(uint8_t *)&(header->adler_checksum));
bank = (sc->sc_bank == sc->sc_bank0) ? sc->sc_bank1 : sc->sc_bank0;
if (erase_bank(sc->sc_dev, (uint8_t *)bank) != 0 ||
write_bank(sc->sc_dev, (uint8_t *)bank, sc->sc_data) != 0) {
sc->sc_isopen = 0;
return ENOSPC;
}
sc->sc_bank = bank;
sc->sc_isopen = 0;
return 0;
}
static int
powermac_nvram_read(struct cdev *dev, struct uio *uio, int ioflag)
{
int rv, amnt, data_available;
struct powermac_nvram_softc *sc;
sc = NVRAM_SOFTC(NVRAM_UNIT(dev));
rv = 0;
while (uio->uio_resid > 0) {
data_available = sizeof(sc->sc_data) - sc->sc_rpos;
if (data_available > 0) {
amnt = MIN(uio->uio_resid, data_available);
rv = uiomove((void *)(sc->sc_data + sc->sc_rpos),
amnt, uio);
if (rv != 0)
break;
sc->sc_rpos += amnt;
} else {
break;
}
}
return rv;
}
static int
powermac_nvram_write(struct cdev *dev, struct uio *uio, int ioflag)
{
int rv, amnt, data_available;
struct powermac_nvram_softc *sc;
sc = NVRAM_SOFTC(NVRAM_UNIT(dev));
if (sc->sc_wpos >= sizeof(sc->sc_data))
return EINVAL;
rv = 0;
while (uio->uio_resid > 0) {
data_available = sizeof(sc->sc_data) - sc->sc_wpos;
if (data_available > 0) {
amnt = MIN(uio->uio_resid, data_available);
rv = uiomove((void *)(sc->sc_data + sc->sc_wpos),
amnt, uio);
if (rv != 0)
break;
sc->sc_wpos += amnt;
} else {
break;
}
}
return rv;
}
static int
powermac_nvram_check(void *data)
{
struct core99_header *header;
header = (struct core99_header *)data;
if (header->chrp_header.signature != CORE99_SIGNATURE)
return -1;
if (header->chrp_header.chrp_checksum !=
chrp_checksum(header->chrp_header.signature,
(uint8_t *)&(header->chrp_header.length),
(uint8_t *)&(header->adler_checksum)))
return -1;
if (header->adler_checksum !=
adler_checksum((uint8_t *)&(header->generation),
NVRAM_SIZE - offsetof(struct core99_header, generation)))
return -1;
return header->generation;
}
static int
chrp_checksum(int sum, uint8_t *data, uint8_t *end)
{
for (; data < end; data++)
sum += data[0];
while (sum > 0xff)
sum = (sum & 0xff) + (sum >> 8);
return sum;
}
static uint32_t
adler_checksum(uint8_t *data, int len)
{
uint32_t low, high;
int i;
low = 1;
high = 0;
for (i = 0; i < len; i++) {
if ((i % 5000) == 0) {
high %= 65521UL;
high %= 65521UL;
}
low += data[i];
high += low;
}
low %= 65521UL;
high %= 65521UL;
return (high << 16) | low;
}
#define OUTB_DELAY(a, v) outb(a, v); DELAY(1);
static int
wait_operation_complete(uint8_t *bank)
{
int i;
for (i = 1000000; i != 0; i--)
if ((inb(bank) ^ inb(bank)) == 0)
return 0;
return -1;
}
static int
erase_bank(device_t dev, uint8_t *bank)
{
unsigned int i;
/* Unlock 1 */
OUTB_DELAY(bank + 0x555, 0xaa);
/* Unlock 2 */
OUTB_DELAY(bank + 0x2aa, 0x55);
/* Sector-Erase */
OUTB_DELAY(bank + 0x555, 0x80);
OUTB_DELAY(bank + 0x555, 0xaa);
OUTB_DELAY(bank + 0x2aa, 0x55);
OUTB_DELAY(bank, 0x30);
if (wait_operation_complete(bank) != 0) {
device_printf(dev, "flash erase timeout\n");
return -1;
}
/* Reset */
OUTB_DELAY(bank, 0xf0);
for (i = 0; i < NVRAM_SIZE; i++) {
if (bank[i] != 0xff) {
device_printf(dev, "flash erase has failed\n");
return -1;
}
}
return 0;
}
static int
write_bank(device_t dev, uint8_t *bank, uint8_t *data)
{
unsigned int i;
for (i = 0; i < NVRAM_SIZE; i++) {
/* Unlock 1 */
OUTB_DELAY(bank + 0x555, 0xaa);
/* Unlock 2 */
OUTB_DELAY(bank + 0x2aa, 0x55);
/* Write single word */
OUTB_DELAY(bank + 0x555, 0xa0);
OUTB_DELAY(bank + i, data[i]);
if (wait_operation_complete(bank) != 0) {
device_printf(dev, "flash write timeout\n");
return -1;
}
}
/* Reset */
OUTB_DELAY(bank, 0xf0);
for (i = 0; i < NVRAM_SIZE; i++) {
if (bank[i] != data[i]) {
device_printf(dev, "flash write has failed\n");
return -1;
}
}
return 0;
}