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Finally complete some work on generalizing the PCF8584-based I2C

Browse Source 
drivers I started quite some time before.

Retire the old i386-only pcf driver, and activate the new general
driver that has been sitting in the tree already for quite some
time.

Build the i2c modules for sparc64 architectures as well (where I've
been developing all this on).
This commit is contained in:
Joerg Wunsch 2005-10-28 15:58:19 +00:00
parent 4cf092a1fa
commit 9b229abc8f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=151805
6 changed files with 15 additions and 635 deletions
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1
sys/conf/files
View File

@ -763,6 +763,7 @@ dev/pccard/power_if.m standard
dev/pccbb/pccbb.c optional cbb
dev/pccbb/pccbb_isa.c optional cbb isa
dev/pccbb/pccbb_pci.c optional cbb pci
dev/pcf/pcf.c optional pcf
dev/pci/eisa_pci.c optional pci eisa
dev/pci/fixup_pci.c optional pci
dev/pci/ignore_pci.c optional pci

2
sys/conf/files.i386
View File

@ -199,6 +199,7 @@ dev/mem/memutil.c optional mem
dev/mse/mse.c optional mse
dev/mse/mse_isa.c optional mse isa
dev/nve/if_nve.c optional nve pci
dev/pcf/pcf_isa.c optional pcf
dev/ppc/ppc.c optional ppc
dev/ppc/ppc_puc.c optional ppc puc pci
dev/random/nehemiah.c optional random
@ -325,7 +326,6 @@ i386/isa/isa.c optional isa
i386/isa/isa_dma.c optional isa
i386/isa/nmi.c standard
i386/isa/npx.c optional npx
i386/isa/pcf.c optional pcf
i386/isa/pcvt/pcvt_drv.c optional vt
i386/isa/pcvt/pcvt_ext.c optional vt
i386/isa/pcvt/pcvt_kbd.c optional vt

2
sys/conf/files.sparc64
View File

@ -46,6 +46,8 @@ dev/ofw/ofw_console.c optional ofw_console
dev/ofw/openfirm.c standard
dev/ofw/openfirmio.c standard
dev/ofw/openpromio.c standard
dev/pcf/envctrl.c optional pcf
dev/pcf/pcf_ebus.c optional pcf ebus
dev/sound/sbus/cs4231.c optional snd_audiocs ebus
dev/sound/sbus/cs4231.c optional snd_audiocs sbus
dev/syscons/scgfbrndr.c optional sc

633
sys/i386/isa/pcf.c
View File

@ -1,633 +0,0 @@
/*-
* Copyright (c) 1998 Nicolas Souchu, Marc Bouget
* 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 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 AUTHOR 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <machine/bus.h>
#include <machine/resource.h>
#include <sys/rman.h>
#include <isa/isareg.h>
#include <isa/isavar.h>
#include <dev/iicbus/iiconf.h>
#include "iicbus_if.h"
#define IO_PCFSIZE 2
#define TIMEOUT 9999 /* XXX */
/* Status bits of S1 register (read only) */
#define nBB 0x01 /* busy when low set/reset by STOP/START*/
#define LAB 0x02 /* lost arbitration bit in multi-master mode */
#define AAS 0x04 /* addressed as slave */
#define LRB 0x08 /* last received byte when not AAS */
#define AD0 0x08 /* general call received when AAS */
#define BER 0x10 /* bus error, misplaced START or STOP */
#define STS 0x20 /* STOP detected in slave receiver mode */
#define PIN 0x80 /* pending interrupt not (r/w) */
/* Control bits of S1 register (write only) */
#define ACK 0x01
#define STO 0x02
#define STA 0x04
#define ENI 0x08
#define ES2 0x10
#define ES1 0x20
#define ES0 0x40
#define BUFSIZE 2048
#define SLAVE_TRANSMITTER 0x1
#define SLAVE_RECEIVER 0x2
#define PCF_DEFAULT_ADDR 0xaa
struct pcf_softc {
int pcf_base; /* isa port */
int pcf_flags;
u_char pcf_addr; /* interface I2C address */
int pcf_slave_mode; /* receiver or transmitter */
int pcf_started; /* 1 if start condition sent */
device_t iicbus; /* the corresponding iicbus */
int rid_irq, rid_ioport;
struct resource *res_irq, *res_ioport;
void *intr_cookie;
};
static int pcf_probe(device_t);
static int pcf_attach(device_t);
static void pcfintr(void *arg);
static int pcf_print_child(device_t, device_t);
static int pcf_repeated_start(device_t, u_char, int);
static int pcf_start(device_t, u_char, int);
static int pcf_stop(device_t);
static int pcf_write(device_t, char *, int, int *, int);
static int pcf_read(device_t, char *, int, int *, int, int);
static int pcf_rst_card(device_t, u_char, u_char, u_char *);
static device_method_t pcf_methods[] = {
/* device interface */
DEVMETHOD(device_probe, pcf_probe),
DEVMETHOD(device_attach, pcf_attach),
/* bus interface */
DEVMETHOD(bus_print_child, pcf_print_child),
/* iicbus interface */
DEVMETHOD(iicbus_callback, iicbus_null_callback),
DEVMETHOD(iicbus_repeated_start, pcf_repeated_start),
DEVMETHOD(iicbus_start, pcf_start),
DEVMETHOD(iicbus_stop, pcf_stop),
DEVMETHOD(iicbus_write, pcf_write),
DEVMETHOD(iicbus_read, pcf_read),
DEVMETHOD(iicbus_reset, pcf_rst_card),
{ 0, 0 }
};
static driver_t pcf_driver = {
"pcf",
pcf_methods,
sizeof(struct pcf_softc),
};
static devclass_t pcf_devclass;
#define DEVTOSOFTC(dev) ((struct pcf_softc *)device_get_softc(dev))
static int
pcf_probe(device_t pcfdev)
{
struct pcf_softc *pcf;
device_t parent = device_get_parent(pcfdev);
uintptr_t base;
device_set_desc(pcfdev, "PCF8584 I2C bus controller");
pcf = DEVTOSOFTC(pcfdev);
bzero(pcf, sizeof(struct pcf_softc));
pcf->rid_irq = pcf->rid_ioport = 0;
pcf->res_irq = pcf->res_ioport = 0;
/* IO port is mandatory */
pcf->res_ioport = bus_alloc_resource(pcfdev, SYS_RES_IOPORT,
&pcf->rid_ioport, 0ul, ~0ul,
IO_PCFSIZE, RF_ACTIVE);
if (pcf->res_ioport == 0) {
device_printf(pcfdev, "cannot reserve I/O port range\n");
goto error;
}
BUS_READ_IVAR(parent, pcfdev, ISA_IVAR_PORT, &base);
pcf->pcf_base = base;
pcf->pcf_flags = device_get_flags(pcfdev);
if (!(pcf->pcf_flags & IIC_POLLED)) {
pcf->res_irq = bus_alloc_resource(pcfdev, SYS_RES_IRQ, &pcf->rid_irq,
0ul, ~0ul, 1, RF_ACTIVE);
if (pcf->res_irq == 0) {
device_printf(pcfdev, "can't reserve irq, polled mode.\n");
pcf->pcf_flags |= IIC_POLLED;
}
}
/* reset the chip */
pcf_rst_card(pcfdev, IIC_FASTEST, PCF_DEFAULT_ADDR, NULL);
return (0);
error:
if (pcf->res_ioport != 0) {
bus_deactivate_resource(pcfdev, SYS_RES_IOPORT, pcf->rid_ioport,
pcf->res_ioport);
bus_release_resource(pcfdev, SYS_RES_IOPORT, pcf->rid_ioport,
pcf->res_ioport);
}
return (ENXIO);
}
static int
pcf_attach(device_t pcfdev)
{
struct pcf_softc *pcf = DEVTOSOFTC(pcfdev);
device_t parent = device_get_parent(pcfdev);
int error = 0;
if (pcf->res_irq) {
/* default to the tty mask for registration */ /* XXX */
error = BUS_SETUP_INTR(parent, pcfdev, pcf->res_irq, INTR_TYPE_NET,
pcfintr, pcfdev, &pcf->intr_cookie);
if (error)
return (error);
}
pcf->iicbus = device_add_child(pcfdev, "iicbus", -1);
/* probe and attach the iicbus */
bus_generic_attach(pcfdev);
return (0);
}
static int
pcf_print_child(device_t bus, device_t dev)
{
struct pcf_softc *pcf = (struct pcf_softc *)device_get_softc(bus);
int retval = 0;
retval += bus_print_child_header(bus, dev);
retval += printf(" on %s addr 0x%x\n", device_get_nameunit(bus),
(int)pcf->pcf_addr);
return (retval);
}
/*
* PCF8584 datasheet : when operate at 8 MHz or more, a minimun time of
* 6 clocks cycles must be left between two consecutives access
*/
#define pcf_nops() DELAY(10)
#define dummy_read(pcf) PCF_GET_S0(pcf)
#define dummy_write(pcf) PCF_SET_S0(pcf, 0)
/*
* Specific register access to PCF8584
*/
static void PCF_SET_S0(struct pcf_softc *pcf, int data)
{
outb(pcf->pcf_base, data);
pcf_nops();
}
static void PCF_SET_S1(struct pcf_softc *pcf, int data)
{
outb(pcf->pcf_base+1, data);
pcf_nops();
}
static char PCF_GET_S0(struct pcf_softc *pcf)
{
char data;
data = inb(pcf->pcf_base);
pcf_nops();
return (data);
}
static char PCF_GET_S1(struct pcf_softc *pcf)
{
char data;
data = inb(pcf->pcf_base+1);
pcf_nops();
return (data);
}
/*
* Polling mode for master operations wait for a new
* byte incomming or outgoing
*/
static int pcf_wait_byte(struct pcf_softc *pcf)
{
int counter = TIMEOUT;
while (counter--) {
if ((PCF_GET_S1(pcf) & PIN) == 0)
return (0);
}
return (IIC_ETIMEOUT);
}
static int pcf_stop(device_t pcfdev)
{
struct pcf_softc *pcf = DEVTOSOFTC(pcfdev);
/*
* Send STOP condition iff the START condition was previously sent.
* STOP is sent only once even if an iicbus_stop() is called after
* an iicbus_read()... see pcf_read(): the pcf needs to send the stop
* before the last char is read.
*/
if (pcf->pcf_started) {
/* set stop condition and enable IT */
PCF_SET_S1(pcf, PIN|ES0|ENI|STO|ACK);
pcf->pcf_started = 0;
}
return (0);
}
static int pcf_noack(struct pcf_softc *pcf, int timeout)
{
int noack;
int k = timeout/10;
do {
noack = PCF_GET_S1(pcf) & LRB;
if (!noack)
break;
DELAY(10); /* XXX wait 10 us */
} while (k--);
return (noack);
}
static int pcf_repeated_start(device_t pcfdev, u_char slave, int timeout)
{
struct pcf_softc *pcf = DEVTOSOFTC(pcfdev);
int error = 0;
/* repeated start */
PCF_SET_S1(pcf, ES0|STA|STO|ACK);
/* set slave address to PCF. Last bit (LSB) must be set correctly
* according to transfer direction */
PCF_SET_S0(pcf, slave);
/* wait for address sent, polling */
if ((error = pcf_wait_byte(pcf)))
goto error;
/* check for ack */
if (pcf_noack(pcf, timeout)) {
error = IIC_ENOACK;
goto error;
}
return (0);
error:
pcf_stop(pcfdev);
return (error);
}
static int pcf_start(device_t pcfdev, u_char slave, int timeout)
{
struct pcf_softc *pcf = DEVTOSOFTC(pcfdev);
int error = 0;
if ((PCF_GET_S1(pcf) & nBB) == 0)
return (IIC_EBUSBSY);
/* set slave address to PCF. Last bit (LSB) must be set correctly
* according to transfer direction */
PCF_SET_S0(pcf, slave);
/* START only */
PCF_SET_S1(pcf, PIN|ES0|STA|ACK);
pcf->pcf_started = 1;
/* wait for address sent, polling */
if ((error = pcf_wait_byte(pcf)))
goto error;
/* check for ACK */
if (pcf_noack(pcf, timeout)) {
error = IIC_ENOACK;
goto error;
}
return (0);
error:
pcf_stop(pcfdev);
return (error);
}
static void
pcfintr(void *arg)
{
device_t pcfdev = (device_t)arg;
struct pcf_softc *pcf = DEVTOSOFTC(pcfdev);
char data, status, addr;
char error = 0;
status = PCF_GET_S1(pcf);
if (status & PIN) {
device_printf(pcfdev, "spurious interrupt, status=0x%x\n", status & 0xff);
goto error;
}
if (status & LAB)
device_printf(pcfdev, "bus arbitration lost!\n");
if (status & BER) {
error = IIC_EBUSERR;
iicbus_intr(pcf->iicbus, INTR_ERROR, &error);
goto error;
}
do {
status = PCF_GET_S1(pcf);
switch(pcf->pcf_slave_mode) {
case SLAVE_TRANSMITTER:
if (status & LRB) {
/* ack interrupt line */
dummy_write(pcf);
/* no ack, don't send anymore */
pcf->pcf_slave_mode = SLAVE_RECEIVER;
iicbus_intr(pcf->iicbus, INTR_NOACK, NULL);
break;
}
/* get data from upper code */
iicbus_intr(pcf->iicbus, INTR_TRANSMIT, &data);
PCF_SET_S0(pcf, data);
break;
case SLAVE_RECEIVER:
if (status & AAS) {
addr = PCF_GET_S0(pcf);
if (status & AD0)
iicbus_intr(pcf->iicbus, INTR_GENERAL, &addr);
else
iicbus_intr(pcf->iicbus, INTR_START, &addr);
if (addr & LSB) {
pcf->pcf_slave_mode = SLAVE_TRANSMITTER;
/* get the first char from upper code */
iicbus_intr(pcf->iicbus, INTR_TRANSMIT, &data);
/* send first data byte */
PCF_SET_S0(pcf, data);
}
break;
}
/* stop condition received? */
if (status & STS) {
/* ack interrupt line */
dummy_read(pcf);
/* emulate intr stop condition */
iicbus_intr(pcf->iicbus, INTR_STOP, NULL);
} else {
/* get data, ack interrupt line */
data = PCF_GET_S0(pcf);
/* deliver the character */
iicbus_intr(pcf->iicbus, INTR_RECEIVE, &data);
}
break;
default:
panic("%s: unknown slave mode (%d)!", __func__,
pcf->pcf_slave_mode);
}
} while ((PCF_GET_S1(pcf) & PIN) == 0);
return;
error:
/* unknown event on bus...reset PCF */
PCF_SET_S1(pcf, PIN|ES0|ENI|ACK);
pcf->pcf_slave_mode = SLAVE_RECEIVER;
return;
}
static int pcf_rst_card(device_t pcfdev, u_char speed, u_char addr, u_char *oldaddr)
{
struct pcf_softc *pcf = DEVTOSOFTC(pcfdev);
if (oldaddr)
*oldaddr = pcf->pcf_addr;
/* retrieve own address from bus level */
if (!addr)
pcf->pcf_addr = PCF_DEFAULT_ADDR;
else
pcf->pcf_addr = addr;
PCF_SET_S1(pcf, PIN); /* initialize S1 */
/* own address S'O<>0 */
PCF_SET_S0(pcf, pcf->pcf_addr >> 1);
/* select clock register */
PCF_SET_S1(pcf, PIN|ES1);
/* select bus speed : 18=90kb, 19=45kb, 1A=11kb, 1B=1.5kb */
switch (speed) {
case IIC_SLOW:
PCF_SET_S0(pcf, 0x1b);
break;
case IIC_FAST:
PCF_SET_S0(pcf, 0x19);
break;
case IIC_UNKNOWN:
case IIC_FASTEST:
default:
PCF_SET_S0(pcf, 0x18);
break;
}
/* set bus on, ack=yes, INT=yes */
PCF_SET_S1(pcf, PIN|ES0|ENI|ACK);
pcf->pcf_slave_mode = SLAVE_RECEIVER;
return (0);
}
static int
pcf_write(device_t pcfdev, char *buf, int len, int *sent, int timeout /* us */)
{
struct pcf_softc *pcf = DEVTOSOFTC(pcfdev);
int bytes, error = 0;
#ifdef PCFDEBUG
printf("pcf%d: >> writing %d bytes\n", device_get_unit(pcfdev), len);
#endif
bytes = 0;
while (len) {
PCF_SET_S0(pcf, *buf++);
/* wait for the byte to be send */
if ((error = pcf_wait_byte(pcf)))
goto error;
/* check if ack received */
if (pcf_noack(pcf, timeout)) {
error = IIC_ENOACK;
goto error;
}
len --;
bytes ++;
}
error:
*sent = bytes;
#ifdef PCFDEBUG
printf("pcf%d: >> %d bytes written (%d)\n",
device_get_unit(pcfdev), bytes, error);
#endif
return (error);
}
static int
pcf_read(device_t pcfdev, char *buf, int len, int *read, int last,
int delay /* us */)
{
struct pcf_softc *pcf = DEVTOSOFTC(pcfdev);
int bytes, error = 0;
#ifdef PCFDEBUG
printf("pcf%d: << reading %d bytes\n", device_get_unit(pcfdev), len);
#endif
/* trig the bus to get the first data byte in S0 */
if (len) {
if (len == 1 && last)
/* just one byte to read */
PCF_SET_S1(pcf, ES0); /* no ack */
dummy_read(pcf);
}
bytes = 0;
while (len) {
/* XXX delay needed here */
/* wait for trigged byte */
if ((error = pcf_wait_byte(pcf))) {
pcf_stop(pcfdev);
goto error;
}
if (len == 1 && last)
/* ok, last data byte already in S0, no I2C activity
* on next PCF_GET_S0() */
pcf_stop(pcfdev);
else if (len == 2 && last)
/* next trigged byte with no ack */
PCF_SET_S1(pcf, ES0);
/* receive byte, trig next byte */
*buf++ = PCF_GET_S0(pcf);
len --;
bytes ++;
};
error:
*read = bytes;
#ifdef PCFDEBUG
printf("pcf%d: << %d bytes read (%d)\n",
device_get_unit(pcfdev), bytes, error);
#endif
return (error);
}
DRIVER_MODULE(pcf, isa, pcf_driver, pcf_devclass, 0, 0);

1
sys/modules/Makefile
View File

@ -495,6 +495,7 @@ _smbfs= smbfs
.if ${MACHINE_ARCH} == "sparc64"
_auxio= auxio
_gem= gem
_i2c= i2c
_sound= sound
.endif

11
sys/modules/i2c/controllers/pcf/Makefile
View File

@ -1,8 +1,17 @@
# $FreeBSD$
.PATH: ${.CURDIR}/../../../../i386/isa
.PATH: ${.CURDIR}/../../../../dev/pcf
KMOD = pcf
SRCS = device_if.h bus_if.h iicbus_if.h isa_if.h \
pcf.c
.if ${MACHINE_ARCH} != "sparc64"
SRCS += pcf_isa.c
.endif
.if ${MACHINE_ARCH} == "sparc64"
SRCS += envctrl.c
SRCS += pcf_ebus.c
.endif
.include <bsd.kmod.mk>