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/* $OpenBSD: pcfiic_ebus.c,v 1.6 2006/06/29 00:01:03 deraadt Exp $ */
/*
* Copyright (c) 2006 David Gwynne <dlg@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Device specific driver for the EBus i2c devices found on some sun4u
* systems. On systems not having a boot-bus controller the i2c devices
* are PCF8584.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kernel.h>
#include <machine/bus.h>
#include <machine/openfirm.h>
#include <machine/autoconf.h>
#include <sparc64/dev/ebusreg.h>
#include <sparc64/dev/ebusvar.h>
#include <dev/i2c/i2cvar.h>
#include <sparc64/dev/ofwi2cvar.h>
#include <dev/ic/pcf8584var.h>
int pcfiic_ebus_match(struct device *, void *, void *);
void pcfiic_ebus_attach(struct device *, struct device *, void *);
struct pcfiic_ebus_softc {
struct pcfiic_softc esc_sc;
int esc_node;
void *esc_ih;
};
struct cfattach pcfiic_ebus_ca = {
sizeof(struct pcfiic_ebus_softc), pcfiic_ebus_match, pcfiic_ebus_attach
};
int
pcfiic_ebus_match(struct device *parent, void *match, void *aux)
{
struct ebus_attach_args *ea = aux;
char compat[32];
if (strcmp(ea->ea_name, "i2c") != 0)
return (0);
if (OF_getprop(ea->ea_node, "compatible", compat, sizeof(compat)) == -1)
return (0);
if (strcmp(compat, "i2cpcf,8584") ||
strcmp(compat, "SUNW,bbc-i2c"))
return (1);
return (0);
}
void
pcfiic_ebus_attach(struct device *parent, struct device *self, void *aux)
{
struct pcfiic_ebus_softc *esc = (struct pcfiic_ebus_softc *)self;
struct pcfiic_softc *sc = &esc->esc_sc;
struct ebus_attach_args *ea = aux;
char compat[32];
u_int64_t addr;
u_int8_t clock = PCF_CLOCK_12;
int swapregs = 0;
if (ea->ea_nregs < 1 || ea->ea_nregs > 2) {
printf(": expected 1 or 2 registers, got %d\n", ea->ea_nregs);
return;
}
if (OF_getprop(ea->ea_node, "compatible", compat, sizeof(compat)) == -1)
return;
if (strcmp(compat, "SUNW,bbc-i2c") == 0) {
/*
* On BBC-based machines, Sun swapped the order of
* the registers on their clone pcf, plus they feed
* it a non-standard clock.
*/
int clk = getpropint(findroot(), "clock-frequency", 0);
if (clk < 105000000)
clock = PCF_CLOCK_3;
else if (clk < 160000000)
clock = PCF_CLOCK_4_43;
swapregs = 1;
}
if (OF_getprop(ea->ea_node, "own-address", &addr, sizeof(addr)) == -1) {
addr = 0xaa;
} else if (addr == 0x00 || addr > 0xff) {
printf(": invalid address on I2C bus");
return;
}
/* Prefer prom mapping, then memory mapping, then io mapping */
if (ea->ea_nvaddrs) {
if (bus_space_map(ea->ea_memtag, ea->ea_vaddrs[0], 0,
BUS_SPACE_MAP_PROMADDRESS, &sc->sc_ioh) != 0)
goto fail;
sc->sc_iot = ea->ea_memtag;
} else if (ebus_bus_map(ea->ea_memtag, 0,
EBUS_PADDR_FROM_REG(&ea->ea_regs[0]),
ea->ea_regs[0].size, 0, 0, &sc->sc_ioh) == 0) {
sc->sc_iot = ea->ea_memtag;
} else if (ebus_bus_map(ea->ea_iotag, 0,
EBUS_PADDR_FROM_REG(&ea->ea_regs[0]),
ea->ea_regs[0].size, 0, 0, &sc->sc_ioh) == 0) {
sc->sc_iot = ea->ea_iotag;
} else {
fail:
printf(": can't map register space\n");
return;
}
if (ea->ea_nregs == 2) {
/*
* Second register only occurs on BBC-based machines,
* and is likely not prom mapped
*/
if (ebus_bus_map(sc->sc_iot, 0, EBUS_PADDR_FROM_REG(&ea->ea_regs[1]),
ea->ea_regs[1].size, 0, 0, &sc->sc_ioh2) != 0) {
printf(": can't map 2nd register space\n");
return;
}
sc->sc_master = 1;
}
if (ea->ea_nintrs >= 1)
esc->esc_ih = bus_intr_establish(sc->sc_iot, ea->ea_intrs[0],
IPL_BIO, 0, pcfiic_intr, sc, self->dv_xname);
else
esc->esc_ih = NULL;
if (esc->esc_ih == NULL)
sc->sc_poll = 1;
pcfiic_attach(sc, (i2c_addr_t)(addr >> 1), clock, swapregs,
ofwiic_scan, &ea->ea_node);
}
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