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freebsd-dev/sys/mips/rmi/xlr_i2c.c

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/*-
* Copyright (c) 2003-2009 RMI Corporation
* 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. Neither the name of RMI Corporation, nor the names of its contributors,
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* 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.
*
* RMI_BSD */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/sys/mips/xlr/xlr_i2c.c,v 1.20.8.1 2008/08/25 23:17:51 cognet Exp $");
/*
* I2C driver for the Palm-BK3220 I2C Host adapter on the RMI XLR.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/rman.h>
#include <dev/iicbus/iiconf.h>
#include <dev/iicbus/iicbus.h>
#include <mips/rmi/iomap.h>
#include <mips/include/resource.h>
#include "iicbus_if.h"
#define DEVTOIICBUS(dev) ((struct iicbus_device*)device_get_ivars(dev))
#define I2C_PALM_CFG 0x00
#define I2C_PALM_CLKDIV 0x01
#define I2C_PALM_DEVADDR 0x02
#define I2C_PALM_ADDR 0x03
#define I2C_PALM_DATAOUT 0x04
#define I2C_PALM_DATAIN 0x05
#define I2C_PALM_STATUS 0x06
#define I2C_PALM_STARTXFR 0x07
#define I2C_PALM_BYTECNT 0x08
#define I2C_PALM_HDSTATIM 0x09
/* TEST Values!! Change as required */
#define I2C_PALM_CFG_DEF 0x000000F8 /* 8-Bit Addr + POR Values */
#define I2C_PALM_CLKDIV_DEF 0x14A //0x00000052
#define I2C_PALM_HDSTATIM_DEF 0x107 //0x00000000
#define I2C_PALM_STARTXFR_RD 0x00000001
#define I2C_PALM_STARTXFR_WR 0x00000000
#define PHOENIX_IO_I2C_0_OFFSET 0x16000
#define PHOENIX_IO_I2C_1_OFFSET 0x17000
#define ARIZONA_I2c_BUS 1
int bus =1;
uint8_t current_slave;
uint8_t read_address;
static xlr_reg_t* iobase_i2c_regs;
static devclass_t xlr_i2c_devclass;
/*
* Device methods
*/
static int xlr_i2c_probe(device_t);
static int xlr_i2c_attach(device_t);
static int xlr_i2c_detach(device_t);
static int xlr_i2c_start(device_t dev, u_char slave, int timeout);
static int xlr_i2c_stop(device_t dev);
static int xlr_i2c_read(device_t dev, char *buf, int len, int *read, int last, int delay );
static int xlr_i2c_write(device_t dev, char *buf, int len, int *sent, int timeout );
struct xlr_i2c_softc
{
device_t dev; /* Myself */
struct resource *mem_res; /* Memory resource */
volatile int flags;
#define RXRDY 4
#define TXRDY 0x10
int sc_started;
int twi_addr;
device_t iicbus;
};
#define MDELAY(a){ \
unsigned long local_loop = 0xfffff; \
while(local_loop--); \
}\
static void get_i2c_base(void)
{
if(bus == 0)
iobase_i2c_regs = xlr_io_mmio(PHOENIX_IO_I2C_0_OFFSET);
else
iobase_i2c_regs = xlr_io_mmio(PHOENIX_IO_I2C_1_OFFSET);
return;
}
static void palm_write(int reg, int value)
{
get_i2c_base();
xlr_write_reg(iobase_i2c_regs, reg, value);
return;
}
static int palm_read(int reg)
{
uint32_t val;
get_i2c_base();
val = xlr_read_reg(iobase_i2c_regs, reg);
return ((int) val);
}
static int palm_addr_only(uint8_t addr, uint8_t offset)
{
volatile uint32_t regVal=0x00;
palm_write(I2C_PALM_ADDR, offset);
palm_write(I2C_PALM_DEVADDR, addr);
palm_write(I2C_PALM_CFG, 0xfa);
palm_write(I2C_PALM_STARTXFR,0x02);
regVal = palm_read(I2C_PALM_STATUS);
if (regVal & 0x0008) {
printf("palm_addr_only: ACKERR. Aborting...\n");
return -1;
}
return 0;
}
static int palm_rx(uint8_t addr, uint8_t offset, uint8_t len,
uint8_t *buf)
{
volatile uint32_t regVal=0x00, ctr=0x00;
int timeOut, numBytes=0x00;
palm_write(I2C_PALM_CFG, 0xfa);
palm_write(I2C_PALM_BYTECNT, len);
palm_write(I2C_PALM_DEVADDR, addr); //DEVADDR=0x4c, 0x68
MDELAY(1);
for (numBytes=0x00; numBytes < len; numBytes++) {
palm_write(I2C_PALM_ADDR, offset+numBytes);//I2C_PALM_ADDR:offset
MDELAY(1);
if (!ctr) {
/* Trigger a READ Transaction */
palm_write(I2C_PALM_STARTXFR, I2C_PALM_STARTXFR_RD);
ctr++;
}
/* Error Conditions [Begin] */
regVal = palm_read(I2C_PALM_STATUS);
MDELAY(1);
if (regVal & 0x0008) {
printf("palm_rx: ACKERR. Aborting...\n");
return -1;
}
timeOut=10;
while ((regVal & 0x0030) && timeOut--) {
palm_write(I2C_PALM_STARTXFR, I2C_PALM_STARTXFR_RD);
regVal = palm_read(I2C_PALM_STATUS);
}
if (timeOut==0x00) {
printf("palm_rx: TimedOut on Valid STARTXFR/Arbitration\n");
return -1;
}
timeOut=10;
/* Do we have valid data from the device yet..? */
regVal &= 0x0004;
while (!regVal && timeOut--) {
regVal = palm_read(I2C_PALM_STATUS) & 0x0004;
}
if (timeOut==0x00) {
printf("palm_rx: TimedOut Waiting for Valid Data\n");
return -1;
}
/* Error Conditions [End] */
/* Read the data */
buf[numBytes] = (uint8_t)palm_read(I2C_PALM_DATAIN);
}
return 0;
}
static int wait_for_idle(void)
{
int timeOut=0x1000;
volatile uint32_t regVal=0x00;
regVal = palm_read(I2C_PALM_STATUS) & 0x0001;
while (regVal && timeOut--) {
regVal = palm_read(I2C_PALM_STATUS) & 0x0001;
}
if (timeOut == 0x00)
return -1; /* Timed Out */
else
return 0;
}
static int palm_tx(uint8_t addr, uint8_t offset, uint8_t* buf, uint8_t len)
{
volatile uint32_t regVal=0x00;
int timeOut, ctr=0x00, numBytes=len;
for (ctr=0x00; ctr<len; ctr++) {
if (wait_for_idle() < 0) {
printf("TimedOut on Waiting for I2C Bus Idle.\n");
return -EIO;
}
palm_write(I2C_PALM_CFG, 0xF8);
palm_write(I2C_PALM_BYTECNT, 0x00);
palm_write(I2C_PALM_DEVADDR, addr); //0x4c, 0x68
palm_write(I2C_PALM_ADDR, offset+numBytes-1); //offset
palm_write(I2C_PALM_DATAOUT, buf[ctr]);
palm_write(I2C_PALM_STARTXFR, I2C_PALM_STARTXFR_WR );
MDELAY(1);
regVal = palm_read(I2C_PALM_STATUS);
MDELAY(1);
if (regVal & 0x0008) {
printf("palm_tx: ACKERR. Aborting...\n");
return -1;
}
timeOut= 0x1000;
while (!(regVal & 0x0002) && timeOut) {
regVal = palm_read(I2C_PALM_STATUS);
timeOut--;
}
if (timeOut==0x00) {
printf("palm_tx: [TimeOut] SDOEMPTY Not Set\n");
return -1;
}
timeOut=1000;
while ((regVal & 0x0030) && timeOut) {
palm_write(I2C_PALM_STARTXFR, I2C_PALM_STARTXFR_WR);
regVal = palm_read(I2C_PALM_STATUS);
timeOut--;
}
if (timeOut==0x00) {
printf("palm_rx: TimedOut on Valid STARTXFR/Arbitration\n");
return -1;
}
numBytes--;
}
return 0;
}
static int
xlr_i2c_probe(device_t dev)
{
device_set_desc(dev, "I2C bus controller");
return (0);
}
/*
* We add all the devices which we know about.
* The generic attach routine will attach them if they are alive.
*/
static int
xlr_i2c_attach(device_t dev)
{
struct xlr_i2c_softc *sc;
int rid;
sc = device_get_softc(dev);
sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
RF_ACTIVE);
if (sc->mem_res == NULL)
{
printf("not able to allocate the bus resource\n");
}
if((sc->iicbus = device_add_child(dev, "iicbus", -1)) == NULL)
printf("could not allocate iicbus instance\n");
bus_generic_attach(dev);
return (0);
}
static int
xlr_i2c_detach(device_t dev)
{
bus_generic_detach(dev);
return (0);
}
/*
static int
xlr_i2c_add_child(device_t dev, int order, const char *name, int unit)
{
printf("********* %s ******** \n", __FUNCTION__);
device_add_child_ordered(dev, order, name, unit);
bus_generic_attach(dev);
return (0);
}
*/
static int xlr_i2c_start(device_t dev, u_char slave, int timeout)
{
int error =0;
struct xlr_i2c_softc *sc;
sc = device_get_softc(dev);
sc->sc_started = 1;
current_slave = (slave >> 1);
return error;
}
static int xlr_i2c_stop(device_t dev)
{
int error =0;
return error;
}
static int xlr_i2c_read(device_t dev, char *buf, int len, int *read, int last,
int delay )
{
int error =0;
if(palm_addr_only(current_slave,read_address) == -1){
printf("I2C ADDRONLY Phase Fail.\n");
return -1;
}
if(palm_rx(current_slave,read_address,len,buf)== -1){
printf("I2C Read Fail.\n");
return -1;
}
*read = len;
return error;
}
static int xlr_i2c_write(device_t dev, char *buf, int len, int *sent, int timeout /* us */)
{
int error =0;
uint8_t write_address;
if(len == 1){
/* address for the next read*/
read_address=buf[0];
return error;
}
if(len < 2)
return (-1);
write_address = buf[0];
/*for write operation, buf[0] contains the register offset and
buf[1] onwards contains the value*/
palm_tx(current_slave,write_address, &buf[1], len-1);
return error;
}
static int
xlr_i2c_callback(device_t dev, int index, caddr_t *data)
{
return 0;
}
static int
xlr_i2c_repeated_start(device_t dev, u_char slave, int timeout)
{
return 0;
}
static device_method_t xlr_i2c_methods[] = {
/* device interface */
DEVMETHOD(device_probe, xlr_i2c_probe),
DEVMETHOD(device_attach, xlr_i2c_attach),
DEVMETHOD(device_detach, xlr_i2c_detach),
/* iicbus interface */
DEVMETHOD(iicbus_callback, xlr_i2c_callback),
DEVMETHOD(iicbus_repeated_start, xlr_i2c_repeated_start),
DEVMETHOD(iicbus_start, xlr_i2c_start),
DEVMETHOD(iicbus_stop, xlr_i2c_stop),
DEVMETHOD(iicbus_write, xlr_i2c_write),
DEVMETHOD(iicbus_read, xlr_i2c_read),
{ 0, 0 }
};
static driver_t xlr_i2c_driver = {
"xlr_i2c",
xlr_i2c_methods,
sizeof(struct xlr_i2c_softc),
};
DRIVER_MODULE(xlr_i2c, iodi, xlr_i2c_driver, xlr_i2c_devclass, 0, 0);
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