Date: Thu, 15 Jan 2009 02:52:32 +0000 (UTC) From: Nathan Whitehorn <nwhitehorn@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r187262 - in head/sys: conf powerpc/conf powerpc/powermac Message-ID: <200901150252.n0F2qWKJ061194@svn.freebsd.org>
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Author: nwhitehorn Date: Thu Jan 15 02:52:31 2009 New Revision: 187262 URL: http://svn.freebsd.org/changeset/base/187262 Log: Driver for Apple Keywest I2C controllers found in MacIO ASICs. Used for power and thermal control, as well as GPIOs on Xserves and controlling sound codecs for Apple built-in audio. Submitted by: Marco Trillo Obtained from: NetBSD Added: head/sys/powerpc/powermac/kiic.c (contents, props changed) Modified: head/sys/conf/files.powerpc head/sys/powerpc/conf/NOTES Modified: head/sys/conf/files.powerpc ============================================================================== --- head/sys/conf/files.powerpc Thu Jan 15 02:46:43 2009 (r187261) +++ head/sys/conf/files.powerpc Thu Jan 15 02:52:31 2009 (r187262) @@ -113,6 +113,7 @@ powerpc/powermac/ata_dbdma.c optional po powerpc/powermac/dbdma.c optional powermac pci powerpc/powermac/grackle.c optional powermac pci powerpc/powermac/hrowpic.c optional powermac pci +powerpc/powermac/kiic.c optional powermac kiic powerpc/powermac/macio.c optional powermac pci powerpc/powermac/openpic_macio.c optional powermac pci powerpc/powermac/pswitch.c optional powermac pswitch Modified: head/sys/powerpc/conf/NOTES ============================================================================== --- head/sys/powerpc/conf/NOTES Thu Jan 15 02:46:43 2009 (r187261) +++ head/sys/powerpc/conf/NOTES Thu Jan 15 02:52:31 2009 (r187262) @@ -25,6 +25,7 @@ options SC_OFWFB # OFW frame buffer device pci device bm # Apple BMAC (Big Mac Ethernet) +device kiic # Apple Keywest I2C Controller device ofwd # Open Firmware disks device adb # Apple Desktop Bus device cuda # VIA-CUDA ADB interface Added: head/sys/powerpc/powermac/kiic.c ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ head/sys/powerpc/powermac/kiic.c Thu Jan 15 02:52:31 2009 (r187262) @@ -0,0 +1,391 @@ +/*- + * Copyright (c) 2001 Tsubai Masanari. 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. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission. + * + * 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. + * + * $FreeBSD$ + * NetBSD: ki2c.c,v 1.11 2007/12/06 17:00:33 ad Exp + * Id: ki2c.c,v 1.7 2002/10/05 09:56:05 tsubai Exp + */ + +/* + * Support routines for the Keywest I2C controller. + */ + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/module.h> +#include <sys/bus.h> +#include <sys/lock.h> +#include <sys/mutex.h> +#include <machine/resource.h> +#include <machine/bus.h> +#include <sys/rman.h> + +#include <dev/iicbus/iicbus.h> +#include <dev/iicbus/iiconf.h> +#include <dev/ofw/ofw_bus.h> +#include "iicbus_if.h" + +/* Keywest I2C Register offsets */ +#define MODE 0 +#define CONTROL 1 +#define STATUS 2 +#define ISR 3 +#define IER 4 +#define ADDR 5 +#define SUBADDR 6 +#define DATA 7 + +/* MODE */ +#define I2C_SPEED 0x03 /* Speed mask */ +#define I2C_100kHz 0x00 +#define I2C_50kHz 0x01 +#define I2C_25kHz 0x02 +#define I2C_MODE 0x0c /* Mode mask */ +#define I2C_DUMBMODE 0x00 /* Dumb mode */ +#define I2C_STDMODE 0x04 /* Standard mode */ +#define I2C_STDSUBMODE 0x08 /* Standard mode + sub address */ +#define I2C_COMBMODE 0x0c /* Combined mode */ +#define I2C_PORT 0xf0 /* Port mask */ + +/* CONTROL */ +#define I2C_CT_AAK 0x01 /* Send AAK */ +#define I2C_CT_ADDR 0x02 /* Send address(es) */ +#define I2C_CT_STOP 0x04 /* Send STOP */ +#define I2C_CT_START 0x08 /* Send START */ + +/* STATUS */ +#define I2C_ST_BUSY 0x01 /* Busy */ +#define I2C_ST_LASTAAK 0x02 /* Last AAK */ +#define I2C_ST_LASTRW 0x04 /* Last R/W */ +#define I2C_ST_SDA 0x08 /* SDA */ +#define I2C_ST_SCL 0x10 /* SCL */ + +/* ISR/IER */ +#define I2C_INT_DATA 0x01 /* Data byte sent/received */ +#define I2C_INT_ADDR 0x02 /* Address sent */ +#define I2C_INT_STOP 0x04 /* STOP condition sent */ +#define I2C_INT_START 0x08 /* START condition sent */ + +/* I2C flags */ +#define I2C_BUSY 0x01 +#define I2C_READING 0x02 +#define I2C_ERROR 0x04 +#define I2C_SELECTED 0x08 + +struct kiic_softc { + device_t sc_dev; + phandle_t sc_node; + struct mtx sc_mutex; + struct resource *sc_reg; + int sc_irqrid; + struct resource *sc_irq; + void *sc_ih; + u_int sc_regstep; + u_int sc_flags; + u_char *sc_data; + int sc_resid; + device_t sc_iicbus; +}; + +static int kiic_probe(device_t dev); +static int kiic_attach(device_t dev); +static void kiic_writereg(struct kiic_softc *sc, u_int, u_int); +static u_int kiic_readreg(struct kiic_softc *, u_int); +static void kiic_setmode(struct kiic_softc *, u_int); +static void kiic_setspeed(struct kiic_softc *, u_int); +static void kiic_intr(void *xsc); +static int kiic_transfer(device_t dev, struct iic_msg *msgs, + uint32_t nmsgs); +static phandle_t kiic_get_node(device_t bus, device_t dev); + +static device_method_t kiic_methods[] = { + /* device interface */ + DEVMETHOD(device_probe, kiic_probe), + DEVMETHOD(device_attach, kiic_attach), + + /* iicbus interface */ + DEVMETHOD(iicbus_callback, iicbus_null_callback), + DEVMETHOD(iicbus_transfer, kiic_transfer), + + /* ofw_bus interface */ + DEVMETHOD(ofw_bus_get_node, kiic_get_node), + + { 0, 0 } +}; + +static driver_t kiic_driver = { + "iichb", + kiic_methods, + sizeof(struct kiic_softc) +}; +static devclass_t kiic_devclass; + +DRIVER_MODULE(kiic, macio, kiic_driver, kiic_devclass, 0, 0); + +static int +kiic_probe(device_t self) +{ + const char *name; + + name = ofw_bus_get_name(self); + if (name && strcmp(name, "i2c") == 0) { + device_set_desc(self, "Keywest I2C controller"); + return (0); + } + + return (ENXIO); +} + +static int +kiic_attach(device_t self) +{ + struct kiic_softc *sc = device_get_softc(self); + int rid, rate; + phandle_t node; + char name[64]; + + bzero(sc, sizeof(*sc)); + sc->sc_dev = self; + + node = ofw_bus_get_node(self); + if (node == 0 || node == -1) { + return (EINVAL); + } + + rid = 0; + sc->sc_reg = bus_alloc_resource_any(self, SYS_RES_MEMORY, + &rid, RF_ACTIVE); + if (sc->sc_reg == NULL) { + return (ENOMEM); + } + + if (OF_getprop(node, "AAPL,i2c-rate", &rate, 4) != 4) { + device_printf(self, "cannot get i2c-rate\n"); + return (ENXIO); + } + if (OF_getprop(node, "AAPL,address-step", &sc->sc_regstep, 4) != 4) { + device_printf(self, "unable to find i2c address step\n"); + return (ENXIO); + } + + /* + * Some Keywest I2C devices have their children attached directly + * underneath them. Some have a single 'iicbus' child with the + * devices underneath that. Sort this out, and make sure that the + * OFW I2C layer has the correct node. + */ + + sc->sc_node = OF_child(node); + if (OF_getprop(sc->sc_node,"name",name,sizeof(name)) > 0) { + if (strcmp(name,"i2c-bus") != 0) + sc->sc_node = node; + } + + mtx_init(&sc->sc_mutex, "kiic", NULL, MTX_DEF); + + sc->sc_irq = bus_alloc_resource_any(self, SYS_RES_IRQ, &sc->sc_irqrid, + RF_ACTIVE); + bus_setup_intr(self, sc->sc_irq, INTR_TYPE_MISC | INTR_MPSAFE, NULL, + kiic_intr, sc, &sc->sc_ih); + + kiic_writereg(sc, STATUS, 0); + kiic_writereg(sc, ISR, 0); + kiic_writereg(sc, IER, 0); + + kiic_setmode(sc, I2C_STDMODE); + kiic_setspeed(sc, I2C_100kHz); /* XXX rate */ + + kiic_writereg(sc, IER, I2C_INT_DATA | I2C_INT_ADDR | I2C_INT_STOP); + + /* Add the IIC bus layer */ + sc->sc_iicbus = device_add_child(self, "iicbus", -1); + + return (bus_generic_attach(self)); +} + +static void +kiic_writereg(struct kiic_softc *sc, u_int reg, u_int val) +{ + bus_write_1(sc->sc_reg, sc->sc_regstep * reg, val); + DELAY(10); /* XXX why? */ +} + +static u_int +kiic_readreg(struct kiic_softc *sc, u_int reg) +{ + return bus_read_1(sc->sc_reg, sc->sc_regstep * reg); +} + +static void +kiic_setmode(struct kiic_softc *sc, u_int mode) +{ + u_int x; + + KASSERT((mode & ~I2C_MODE) == 0, ("bad mode")); + x = kiic_readreg(sc, MODE); + x &= ~I2C_MODE; + x |= mode; + kiic_writereg(sc, MODE, x); +} + +static void +kiic_setspeed(struct kiic_softc *sc, u_int speed) +{ + u_int x; + + KASSERT((speed & ~I2C_SPEED) == 0, ("bad speed")); + x = kiic_readreg(sc, MODE); + x &= ~I2C_SPEED; + x |= speed; + kiic_writereg(sc, MODE, x); +} + +static void +kiic_intr(void *xsc) +{ + struct kiic_softc *sc = xsc; + u_int isr; + uint32_t x; + + mtx_lock(&sc->sc_mutex); + isr = kiic_readreg(sc, ISR); + + if (isr & I2C_INT_ADDR) { + sc->sc_flags |= I2C_SELECTED; + + if (sc->sc_flags & I2C_READING) { + if (sc->sc_resid > 1) { + x = kiic_readreg(sc, CONTROL); + x |= I2C_CT_AAK; + kiic_writereg(sc, CONTROL, x); + } + } else { + kiic_writereg(sc, DATA, *sc->sc_data++); + sc->sc_resid--; + } + } + + if (isr & I2C_INT_DATA) { + if (sc->sc_resid > 0) { + if (sc->sc_flags & I2C_READING) { + *sc->sc_data++ = kiic_readreg(sc, DATA); + sc->sc_resid--; + } else { + kiic_writereg(sc, DATA, *sc->sc_data++); + sc->sc_resid--; + } + } + + if (sc->sc_resid == 0) + wakeup(sc->sc_dev); + } + + if (isr & I2C_INT_STOP) { + kiic_writereg(sc, CONTROL, 0); + sc->sc_flags &= ~I2C_SELECTED; + wakeup(sc->sc_dev); + } + + kiic_writereg(sc, ISR, isr); + mtx_unlock(&sc->sc_mutex); +} + +static int +kiic_transfer(device_t dev, struct iic_msg *msgs, uint32_t nmsgs) +{ + struct kiic_softc *sc; + int i, x, timo; + uint8_t addr; + + sc = device_get_softc(dev); + timo = 100; + + mtx_lock(&sc->sc_mutex); + + if (sc->sc_flags & I2C_BUSY) + mtx_sleep(dev, &sc->sc_mutex, 0, "kiic", timo); + + if (sc->sc_flags & I2C_BUSY) { + mtx_unlock(&sc->sc_mutex); + return (ETIMEDOUT); + } + + sc->sc_flags = I2C_BUSY; + + for (i = 0; i < nmsgs; i++) { + sc->sc_data = msgs[i].buf; + sc->sc_resid = msgs[i].len; + sc->sc_flags = I2C_BUSY; + addr = msgs[i].slave; + timo = 1000 + sc->sc_resid * 200; + + if (msgs[i].flags & IIC_M_RD) { + sc->sc_flags |= I2C_READING; + addr |= 1; + } + + kiic_writereg(sc, ADDR, addr); + kiic_writereg(sc, SUBADDR, 0x04); + + x = kiic_readreg(sc, CONTROL) | I2C_CT_ADDR; + kiic_writereg(sc, CONTROL, x); + + mtx_sleep(dev, &sc->sc_mutex, 0, "kiic", timo); + + if (!(sc->sc_flags & I2C_READING)) { + x = kiic_readreg(sc, CONTROL) | I2C_CT_STOP; + kiic_writereg(sc, CONTROL, x); + } + + mtx_sleep(dev, &sc->sc_mutex, 0, "kiic", timo); + + msgs[i].len -= sc->sc_resid; + + if (sc->sc_flags & I2C_ERROR) { + device_printf(sc->sc_dev, "I2C_ERROR\n"); + mtx_unlock(&sc->sc_mutex); + return (-1); + } + } + + sc->sc_flags = 0; + + mtx_unlock(&sc->sc_mutex); + + return (0); +} + +static phandle_t +kiic_get_node(device_t bus, device_t dev) +{ + struct kiic_softc *sc; + + sc = device_get_softc(bus); + /* We only have one child, the I2C bus, which needs our own node. */ + + return sc->sc_node; +} +
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