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[src/thorpej-i2c-spi-conf]: src/sys/dev/ic Update the pcfiic driver for the n...
details: https://anonhg.NetBSD.org/src/rev/b544e7b6099c
branches: thorpej-i2c-spi-conf
changeset: 1020808:b544e7b6099c
user: thorpej <thorpej%NetBSD.org@localhost>
date: Fri May 14 06:53:14 2021 +0000
description:
Update the pcfiic driver for the new i2c device enumeration scheme.
Push the multiple-channels complexity up into the ebus front-end,
as that specific to a particular Sun model of controller. Now
the BBC-type controllers get multiple I2C bus instances attached to
them.
diffstat:
sys/arch/sparc64/dev/pcfiic_ebus.c | 181 +++++++++++++++++++++++++++++++-----
sys/dev/ic/pcf8584.c | 95 ++++++++++++++-----
sys/dev/ic/pcf8584var.h | 36 +++++-
3 files changed, 253 insertions(+), 59 deletions(-)
diffs (truncated from 484 to 300 lines):
diff -r e8a69d8d6655 -r b544e7b6099c sys/arch/sparc64/dev/pcfiic_ebus.c
--- a/sys/arch/sparc64/dev/pcfiic_ebus.c Fri May 14 03:57:51 2021 +0000
+++ b/sys/arch/sparc64/dev/pcfiic_ebus.c Fri May 14 06:53:14 2021 +0000
@@ -1,7 +1,36 @@
-/* $NetBSD: pcfiic_ebus.c,v 1.7 2020/10/23 15:18:10 jdc Exp $ */
+/* $NetBSD: pcfiic_ebus.c,v 1.7.6.1 2021/05/14 06:53:14 thorpej Exp $ */
/* $OpenBSD: pcfiic_ebus.c,v 1.13 2008/06/08 03:07:40 deraadt Exp $ */
/*
+ * Copyright (c) 2021 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Jason R. Thorpe.
+ *
+ * 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``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 FOUNDATION OR CONTRIBUTORS
+ * 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.
+ */
+
+/*
* Copyright (c) 2006 David Gwynne <dlg%openbsd.org@localhost>
*
* Permission to use, copy, modify, and distribute this software for any
@@ -18,7 +47,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: pcfiic_ebus.c,v 1.7 2020/10/23 15:18:10 jdc Exp $");
+__KERNEL_RCSID(0, "$NetBSD: pcfiic_ebus.c,v 1.7.6.1 2021/05/14 06:53:14 thorpej Exp $");
/*
* Device specific driver for the EBus i2c devices found on some sun4u
@@ -30,7 +59,8 @@
#include <sys/systm.h>
#include <sys/device.h>
#include <sys/kernel.h>
-#include <sys/rwlock.h>
+#include <sys/kmem.h>
+#include <sys/mutex.h>
#include <sys/bus.h>
#include <machine/openfirm.h>
@@ -44,20 +74,119 @@
#include <dev/ic/pcf8584var.h>
#include <dev/ic/pcf8584reg.h>
-int pcfiic_ebus_match(device_t, struct cfdata *, void *);
-void pcfiic_ebus_attach(device_t, device_t, void *);
-
struct pcfiic_ebus_softc {
struct pcfiic_softc esc_sc;
- int esc_node;
+ kmutex_t esc_ctrl_lock;
+ bus_space_handle_t esc_ioh; /* for channel selection */
+
void *esc_ih;
};
-CFATTACH_DECL_NEW(pcfiic, sizeof(struct pcfiic_ebus_softc),
- pcfiic_ebus_match, pcfiic_ebus_attach, NULL, NULL);
+static void
+bbc_select_channel(struct pcfiic_ebus_softc *esc, uint8_t channel)
+{
+ bus_space_write_1(esc->esc_sc.sc_iot, esc->esc_ioh, 0, channel);
+ bus_space_barrier(esc->esc_sc.sc_iot, esc->esc_ioh, 0, 1,
+ BUS_SPACE_BARRIER_WRITE);
+}
+
+static int
+bbc_acquire_bus(void *v, int flags)
+{
+ struct pcfiic_channel *ch = v;
+ struct pcfiic_ebus_softc *esc = container_of(ch->ch_sc,
+ struct pcfiic_ebus_softc, esc_sc);
+
+ if (flags & I2C_F_POLL) {
+ if (! mutex_tryenter(&esc->esc_ctrl_lock)) {
+ return EBUSY;
+ }
+ } else {
+ mutex_enter(&esc->esc_ctrl_lock);
+ }
+
+ bbc_select_channel(esc, (uint8_t)ch->ch_channel);
+ return 0;
+}
+
+static void
+bbc_release_bus(void *v, int flags)
+{
+ struct pcfiic_channel *ch = v;
+ struct pcfiic_ebus_softc *esc = container_of(ch->ch_sc,
+ struct pcfiic_ebus_softc, esc_sc);
+
+ mutex_exit(&esc->esc_ctrl_lock);
+}
+
+static void
+bbc_initialize_channels(struct pcfiic_ebus_softc *esc)
+{
+ struct pcfiic_softc *sc = &esc->esc_sc;
+ struct pcfiic_channel *ch;
+ devhandle_t devhandle = device_handle(sc->sc_dev);
+ unsigned int busmap = 0;
+ int node = devhandle_to_of(devhandle);
+ uint32_t reg[2];
+ uint32_t channel;
+ int i, nchannels;
-int
+ /*
+ * Two physical I2C busses share a single controller. The
+ * devices are not distinct, so it's not easy to treat it
+ * it as a mux.
+ *
+ * The locking order is:
+ *
+ * iic bus mutex -> ctrl_lock
+ *
+ * ctrl_lock is taken in bbc_acquire_bus.
+ */
+ mutex_init(&esc->esc_ctrl_lock, MUTEX_DEFAULT, IPL_NONE);
+ sc->sc_acquire_bus = bbc_acquire_bus;
+ sc->sc_release_bus = bbc_release_bus;
+
+ /*
+ * The Sun device tree has all devices, no matter the
+ * channel, as direct children of this node. Figure
+ * out which channel numbers are listed, count them,
+ * and then populate the channel structures.
+ */
+ for (node = OF_child(node); node != 0; node = OF_peer(node)) {
+ if (OF_getprop(node, "reg", reg, sizeof(reg)) != sizeof(reg)) {
+ continue;
+ }
+
+ /* Channel is in the first cell. */
+ channel = be32toh(reg[0]);
+ KASSERT(channel < 32);
+
+ busmap |= __BIT(channel);
+ }
+
+ nchannels = popcount(busmap);
+ if (nchannels == 0) {
+ /* No child devices. */
+ return;
+ }
+
+ ch = kmem_alloc(nchannels * sizeof(*ch), KM_SLEEP);
+ for (i = 0; i < nchannels; i++) {
+ channel = ffs(busmap);
+ KASSERT(channel != 0);
+ channel--; /* ffs() returns 0 if no bits set. */
+ busmap &= ~__BIT(channel);
+
+ ch[i].ch_channel = channel;
+ ch[i].ch_devhandle = devhandle;
+ }
+
+ sc->sc_channels = ch;
+ sc->sc_nchannels = nchannels;
+}
+
+static int
pcfiic_ebus_match(device_t parent, struct cfdata *match, void *aux)
{
struct ebus_attach_args *ea = aux;
@@ -82,15 +211,15 @@
return (0);
}
-void
+static void
pcfiic_ebus_attach(device_t parent, device_t self, void *aux)
{
struct pcfiic_ebus_softc *esc = device_private(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 = PCF8584_CLK_12 | PCF8584_SCL_90;
+ uint32_t addr[2];
+ uint8_t clock = PCF8584_CLK_12 | PCF8584_SCL_90;
int swapregs = 0;
if (ea->ea_nreg < 1 || ea->ea_nreg > 2) {
@@ -121,15 +250,15 @@
}
if (OF_getprop(ea->ea_node, "own-address", &addr, sizeof(addr)) == -1) {
- addr = 0xaa;
- } else if (addr == 0x00 || addr > 0xff) {
+ addr[0] = 0;
+ addr[1] = 0x55 << 1;
+ } else if (addr[1] == 0x00 || addr[1] > 0xff) {
printf(": invalid address on I2C bus");
return;
}
- if (bus_space_map(ea->ea_bustag,
- EBUS_ADDR_FROM_REG(&ea->ea_reg[0]),
- ea->ea_reg[0].size, 0, &sc->sc_ioh) == 0) {
+ if (bus_space_map(ea->ea_bustag, EBUS_ADDR_FROM_REG(&ea->ea_reg[0]),
+ ea->ea_reg[0].size, 0, &sc->sc_ioh) == 0) {
sc->sc_iot = ea->ea_bustag;
} else {
printf(": can't map register space\n");
@@ -140,14 +269,14 @@
/*
* Second register only occurs on BBC-based machines,
* and is likely not prom mapped
- */
- if (bus_space_map(sc->sc_iot, EBUS_ADDR_FROM_REG(&ea->ea_reg[1]),
- ea->ea_reg[1].size, 0, &sc->sc_ioh2) != 0) {
+ */
+ if (bus_space_map(sc->sc_iot,
+ EBUS_ADDR_FROM_REG(&ea->ea_reg[1]),
+ ea->ea_reg[1].size, 0, &esc->esc_ioh) != 0) {
printf(": can't map 2nd register space\n");
return;
}
- sc->sc_master = 1;
- printf(": iic mux present");
+ bbc_initialize_channels(esc);
}
if (ea->ea_nintr >= 1)
@@ -156,9 +285,11 @@
else
esc->esc_ih = NULL;
-
if (esc->esc_ih == NULL)
sc->sc_poll = 1;
- pcfiic_attach(sc, (i2c_addr_t)(addr >> 1), clock, swapregs);
+ pcfiic_attach(sc, (i2c_addr_t)(addr[1] >> 1), clock, swapregs);
}
+
+CFATTACH_DECL_NEW(pcfiic, sizeof(struct pcfiic_ebus_softc),
+ pcfiic_ebus_match, pcfiic_ebus_attach, NULL, NULL);
diff -r e8a69d8d6655 -r b544e7b6099c sys/dev/ic/pcf8584.c
--- a/sys/dev/ic/pcf8584.c Fri May 14 03:57:51 2021 +0000
+++ b/sys/dev/ic/pcf8584.c Fri May 14 06:53:14 2021 +0000
@@ -1,7 +1,36 @@
-/* $NetBSD: pcf8584.c,v 1.18 2021/04/24 23:36:55 thorpej Exp $ */
+/* $NetBSD: pcf8584.c,v 1.18.2.1 2021/05/14 06:53:14 thorpej Exp $ */
/* $OpenBSD: pcf8584.c,v 1.9 2007/10/20 18:46:21 kettenis Exp $ */
/*
+ * Copyright (c) 2021 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Jason R. Thorpe.
+ *
+ * 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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``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 FOUNDATION OR CONTRIBUTORS
+ * 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.
+ */
+
+/*
* Copyright (c) 2006 David Gwynne <dlg%openbsd.org@localhost>
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