407 lines
10 KiB
C
407 lines
10 KiB
C
/*-
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* Copyright (c) 2003-2009 RMI Corporation
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of RMI Corporation, nor the names of its contributors,
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* RMI_BSD */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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/*
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* I2C driver for the Palm-BK3220 I2C Host adapter on the RMI XLR.
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/mutex.h>
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#include <sys/bus.h>
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#include <sys/rman.h>
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#include <dev/iicbus/iiconf.h>
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#include <dev/iicbus/iicbus.h>
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#include <mips/rmi/board.h>
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#include <mips/rmi/iomap.h>
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#include <mips/include/resource.h>
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#include "iicbus_if.h"
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/* XLR I2C REGISTERS */
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#define XLR_I2C_CFG 0x00
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#define XLR_I2C_CLKDIV 0x01
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#define XLR_I2C_DEVADDR 0x02
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#define XLR_I2C_ADDR 0x03
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#define XLR_I2C_DATAOUT 0x04
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#define XLR_I2C_DATAIN 0x05
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#define XLR_I2C_STATUS 0x06
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#define XLR_I2C_STARTXFR 0x07
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#define XLR_I2C_BYTECNT 0x08
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#define XLR_I2C_HDSTATIM 0x09
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/* XLR I2C REGISTERS FLAGS */
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#define XLR_I2C_BUS_BUSY 0x01
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#define XLR_I2C_SDOEMPTY 0x02
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#define XLR_I2C_RXRDY 0x04
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#define XLR_I2C_ACK_ERR 0x08
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#define XLR_I2C_ARB_STARTERR 0x30
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/* Register Programming Values!! Change as required */
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#define XLR_I2C_CFG_ADDR 0xF8 /* 8-Bit dev Addr + POR Values */
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#define XLR_I2C_CFG_NOADDR 0xFA /* 8-Bit reg Addr + POR Values : No dev addr */
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#define XLR_I2C_STARTXFR_ND 0x02 /* No data , only addr */
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#define XLR_I2C_STARTXFR_RD 0x01 /* Read */
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#define XLR_I2C_STARTXFR_WR 0x00 /* Write */
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#define XLR_I2C_CLKDIV_DEF 0x14A /* 0x00000052 */
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#define XLR_I2C_HDSTATIM_DEF 0x107 /* 0x00000000 */
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#define MAXTIME 0x10000
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#define ARIZONA_I2C_BUS 1
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static devclass_t xlr_i2c_devclass;
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/*
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* Device methods
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*/
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static int xlr_i2c_probe(device_t);
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static int xlr_i2c_attach(device_t);
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static int xlr_i2c_detach(device_t);
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static int xlr_i2c_start(device_t dev, u_char slave, int timeout);
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static int xlr_i2c_stop(device_t dev);
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static int xlr_i2c_read(device_t dev, char *buf, int len, int *read, int last, int delay);
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static int xlr_i2c_write(device_t dev, const char *buf, int len, int *sent, int timeout);
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static int xlr_i2c_callback(device_t dev, int index, caddr_t data);
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static int xlr_i2c_repeated_start(device_t dev, u_char slave, int timeout);
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static int xlr_i2c_transfer(device_t bus, struct iic_msg *msgs, uint32_t nmsgs);
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struct xlr_i2c_softc {
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device_t dev; /* Self */
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struct resource *mem_res; /* Memory resource */
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volatile int flags;
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int sc_started;
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uint8_t i2cdev_addr;
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xlr_reg_t *iobase_i2c_regs;
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device_t iicbus;
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struct mtx sc_mtx;
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};
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static void
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set_i2c_base(device_t dev)
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{
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struct xlr_i2c_softc *sc;
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sc = device_get_softc(dev);
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if (device_get_unit(dev) == 0)
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sc->iobase_i2c_regs = xlr_io_mmio(XLR_IO_I2C_0_OFFSET);
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else
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sc->iobase_i2c_regs = xlr_io_mmio(XLR_IO_I2C_1_OFFSET);
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}
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static void
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xlr_i2c_dev_write(device_t dev, int reg, int value)
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{
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struct xlr_i2c_softc *sc;
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sc = device_get_softc(dev);
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xlr_write_reg(sc->iobase_i2c_regs, reg, value);
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return;
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}
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static int
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xlr_i2c_dev_read(device_t dev, int reg)
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{
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uint32_t val;
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struct xlr_i2c_softc *sc;
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sc = device_get_softc(dev);
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val = xlr_read_reg(sc->iobase_i2c_regs, reg);
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return ((int)val);
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}
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static int
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xlr_i2c_probe(device_t dev)
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{
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device_set_desc(dev, "XLR/XLS I2C bus controller");
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return (0);
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}
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/*
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* We add all the devices which we know about.
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* The generic attach routine will attach them if they are alive.
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*/
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static int
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xlr_i2c_attach(device_t dev)
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{
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int rid;
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struct xlr_i2c_softc *sc;
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device_t tmpd;
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if(device_get_unit(dev)!=ARIZONA_I2C_BUS) {
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device_printf(dev, "unused iicbus instance\n");
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return 0;
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}
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sc = device_get_softc(dev);
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set_i2c_base(dev);
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mtx_init(&sc->sc_mtx, "xlr_i2c", "xlr_i2c", MTX_DEF);
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sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
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if (sc->mem_res == NULL) {
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printf("not able to allocate the bus resource\n");
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}
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if ((sc->iicbus = device_add_child(dev, "iicbus", -1)) == NULL) {
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printf("could not allocate iicbus instance\n");
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return -1;
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}
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if(xlr_board_info.xlr_i2c_device[I2C_RTC].enabled == 1) {
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tmpd = device_add_child(sc->iicbus, "ds1374u", 0);
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device_set_ivars(tmpd, &xlr_board_info.xlr_i2c_device[I2C_RTC]);
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}
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if(xlr_board_info.xlr_i2c_device[I2C_THERMAL].enabled == 1) {
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tmpd = device_add_child(sc->iicbus, "max6657", 0);
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device_set_ivars(tmpd, &xlr_board_info.xlr_i2c_device[I2C_THERMAL]);
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}
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if(xlr_board_info.xlr_i2c_device[I2C_EEPROM].enabled == 1) {
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tmpd = device_add_child(sc->iicbus, "at24co2n", 0);
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device_set_ivars(tmpd, &xlr_board_info.xlr_i2c_device[I2C_EEPROM]);
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}
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bus_generic_attach(dev);
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return (0);
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}
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static int
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xlr_i2c_detach(device_t dev)
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{
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bus_generic_detach(dev);
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return (0);
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}
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static int
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xlr_i2c_start(device_t dev, u_char slave, int timeout)
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{
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int error = 0;
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struct xlr_i2c_softc *sc;
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sc = device_get_softc(dev);
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mtx_lock(&sc->sc_mtx);
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sc->sc_started = 1;
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sc->i2cdev_addr = (slave >> 1);
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return error;
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}
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static int
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xlr_i2c_stop(device_t dev)
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{
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int error = 0;
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struct xlr_i2c_softc *sc;
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sc = device_get_softc(dev);
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mtx_unlock(&sc->sc_mtx);
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return error;
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}
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static int
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xlr_i2c_read(device_t dev, char *buf, int len, int *read, int last,
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int delay)
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{
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volatile uint32_t i2c_status = 0;
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int pos=0;
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int timeout = 0;
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xlr_i2c_dev_write(dev, XLR_I2C_CFG, XLR_I2C_CFG_NOADDR);
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xlr_i2c_dev_write(dev, XLR_I2C_BYTECNT, len);
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retry:
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xlr_i2c_dev_write(dev, XLR_I2C_STARTXFR, XLR_I2C_STARTXFR_RD);
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timeout = 0;
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while(1) {
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if(timeout++ > MAXTIME)
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return -1;
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i2c_status = xlr_i2c_dev_read(dev, XLR_I2C_STATUS);
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if (i2c_status & XLR_I2C_RXRDY)
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buf[pos++] = (uint8_t) xlr_i2c_dev_read(dev, XLR_I2C_DATAIN);
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/* ACKERR -- bail */
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if (i2c_status & XLR_I2C_ACK_ERR)
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return -1; /* ACK_ERROR */
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/* LOST ARB or STARTERR -- repeat */
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if (i2c_status & XLR_I2C_ARB_STARTERR)
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goto retry;
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/* Wait for busy bit to go away */
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if (i2c_status & XLR_I2C_BUS_BUSY)
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continue;
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if (pos == len)
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break;
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}
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*read = pos;
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return 0;
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}
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static int
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xlr_i2c_write(device_t dev, const char *buf, int len, int *sent, int timeout /* us */ )
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{
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volatile uint32_t i2c_status = 0x00;
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uint8_t devaddr, addr;
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struct xlr_i2c_softc *sc;
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int pos;
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sc = device_get_softc(dev);
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/* the first byte of write is addr (of register in device) */
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addr = buf[0];
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devaddr = sc->i2cdev_addr;
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xlr_i2c_dev_write(dev, XLR_I2C_ADDR, addr);
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xlr_i2c_dev_write(dev, XLR_I2C_DEVADDR, devaddr);
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xlr_i2c_dev_write(dev, XLR_I2C_CFG, XLR_I2C_CFG_ADDR);
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xlr_i2c_dev_write(dev, XLR_I2C_BYTECNT, len - 1);
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retry:
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pos = 1;
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if (len == 1) /* there is no data only address */
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xlr_i2c_dev_write(dev, XLR_I2C_STARTXFR, XLR_I2C_STARTXFR_ND);
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else {
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xlr_i2c_dev_write(dev, XLR_I2C_STARTXFR, XLR_I2C_STARTXFR_WR);
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xlr_i2c_dev_write(dev, XLR_I2C_DATAOUT, buf[pos]);
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}
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while (1) {
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i2c_status = xlr_i2c_dev_read(dev, XLR_I2C_STATUS);
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/* sdo empty send next byte */
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if (i2c_status & XLR_I2C_SDOEMPTY) {
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pos++;
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xlr_i2c_dev_write(dev, XLR_I2C_DATAOUT, buf[pos]);
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}
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/* LOST ARB or STARTERR -- repeat */
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if (i2c_status & XLR_I2C_ARB_STARTERR)
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goto retry;
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/* ACKERR -- bail */
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if (i2c_status & XLR_I2C_ACK_ERR) {
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printf("ACK ERR : exiting\n ");
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return -1;
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}
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/* busy try again */
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if (i2c_status & XLR_I2C_BUS_BUSY)
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continue;
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if (pos >= len)
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break;
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}
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*sent = len - 1;
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return 0;
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}
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static int
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xlr_i2c_callback(device_t dev, int index, caddr_t data)
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{
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return 0;
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}
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static int
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xlr_i2c_repeated_start(device_t dev, u_char slave, int timeout)
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{
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return 0;
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}
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/*
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* I2C bus transfer for RMI boards and devices.
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* Generic version of iicbus_transfer that calls the appropriate
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* routines to accomplish this. See note above about acceptable
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* buffer addresses.
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*/
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int
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xlr_i2c_transfer(device_t bus, struct iic_msg *msgs, uint32_t nmsgs)
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{
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int i, error, lenread, lenwrote;
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u_char addr;
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addr = msgs[0].slave | LSB;
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error = xlr_i2c_start(bus, addr, 0);
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for (i = 0, error = 0; i < nmsgs && error == 0; i++) {
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if (msgs[i].flags & IIC_M_RD) {
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error = xlr_i2c_read((bus), msgs[i].buf, msgs[i].len, &lenread, IIC_LAST_READ, 0);
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}
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else {
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error = xlr_i2c_write((bus), msgs[i].buf, msgs[i].len, &lenwrote, 0);
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}
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}
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error = xlr_i2c_stop(bus);
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return (error);
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}
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static device_method_t xlr_i2c_methods[] = {
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/* device interface */
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DEVMETHOD(device_probe, xlr_i2c_probe),
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DEVMETHOD(device_attach, xlr_i2c_attach),
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DEVMETHOD(device_detach, xlr_i2c_detach),
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/* iicbus interface */
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DEVMETHOD(iicbus_callback, xlr_i2c_callback),
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DEVMETHOD(iicbus_repeated_start, xlr_i2c_repeated_start),
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DEVMETHOD(iicbus_start, xlr_i2c_start),
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DEVMETHOD(iicbus_stop, xlr_i2c_stop),
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DEVMETHOD(iicbus_write, xlr_i2c_write),
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DEVMETHOD(iicbus_read, xlr_i2c_read),
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DEVMETHOD(iicbus_transfer, xlr_i2c_transfer),
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{0, 0}
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};
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static driver_t xlr_i2c_driver = {
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"xlr_i2c",
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xlr_i2c_methods,
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sizeof(struct xlr_i2c_softc),
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};
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DRIVER_MODULE(xlr_i2c, iodi, xlr_i2c_driver, xlr_i2c_devclass, 0, 0);
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DRIVER_MODULE(iicbus, xlr_i2c, iicbus_driver, iicbus_devclass, 0, 0);
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