e78e34c963
somehow without them on projects/mips, and that mistake was propigated over to head. Submitted by: rpaulo@
456 lines
10 KiB
C
456 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/module.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/iomap.h>
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#include <mips/include/resource.h>
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#include "iicbus_if.h"
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#define DEVTOIICBUS(dev) ((struct iicbus_device*)device_get_ivars(dev))
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#define I2C_PALM_CFG 0x00
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#define I2C_PALM_CLKDIV 0x01
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#define I2C_PALM_DEVADDR 0x02
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#define I2C_PALM_ADDR 0x03
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#define I2C_PALM_DATAOUT 0x04
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#define I2C_PALM_DATAIN 0x05
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#define I2C_PALM_STATUS 0x06
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#define I2C_PALM_STARTXFR 0x07
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#define I2C_PALM_BYTECNT 0x08
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#define I2C_PALM_HDSTATIM 0x09
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/* TEST Values!! Change as required */
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#define I2C_PALM_CFG_DEF 0x000000F8 /* 8-Bit Addr + POR Values */
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#define I2C_PALM_CLKDIV_DEF 0x14A //0x00000052
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#define I2C_PALM_HDSTATIM_DEF 0x107 //0x00000000
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#define I2C_PALM_STARTXFR_RD 0x00000001
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#define I2C_PALM_STARTXFR_WR 0x00000000
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#define PHOENIX_IO_I2C_0_OFFSET 0x16000
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#define PHOENIX_IO_I2C_1_OFFSET 0x17000
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#define ARIZONA_I2c_BUS 1
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int bus = 1;
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uint8_t current_slave;
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uint8_t read_address;
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static xlr_reg_t *iobase_i2c_regs;
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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, char *buf, int len, int *sent, int timeout);
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struct xlr_i2c_softc {
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device_t dev; /* Myself */
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struct resource *mem_res; /* Memory resource */
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volatile int flags;
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#define RXRDY 4
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#define TXRDY 0x10
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int sc_started;
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int twi_addr;
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device_t iicbus;
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};
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#define MDELAY(a){ \
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unsigned long local_loop = 0xfffff; \
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while(local_loop--); \
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}\
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static void
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get_i2c_base(void)
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{
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if (bus == 0)
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iobase_i2c_regs = xlr_io_mmio(PHOENIX_IO_I2C_0_OFFSET);
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else
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iobase_i2c_regs = xlr_io_mmio(PHOENIX_IO_I2C_1_OFFSET);
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return;
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}
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static void
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palm_write(int reg, int value)
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{
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get_i2c_base();
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xlr_write_reg(iobase_i2c_regs, reg, value);
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return;
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}
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static int
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palm_read(int reg)
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{
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uint32_t val;
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get_i2c_base();
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val = xlr_read_reg(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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palm_addr_only(uint8_t addr, uint8_t offset)
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{
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volatile uint32_t regVal = 0x00;
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palm_write(I2C_PALM_ADDR, offset);
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palm_write(I2C_PALM_DEVADDR, addr);
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palm_write(I2C_PALM_CFG, 0xfa);
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palm_write(I2C_PALM_STARTXFR, 0x02);
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regVal = palm_read(I2C_PALM_STATUS);
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if (regVal & 0x0008) {
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printf("palm_addr_only: ACKERR. Aborting...\n");
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return -1;
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}
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return 0;
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}
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static int
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palm_rx(uint8_t addr, uint8_t offset, uint8_t len,
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uint8_t * buf)
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{
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volatile uint32_t regVal = 0x00, ctr = 0x00;
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int timeOut, numBytes = 0x00;
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palm_write(I2C_PALM_CFG, 0xfa);
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palm_write(I2C_PALM_BYTECNT, len);
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palm_write(I2C_PALM_DEVADDR, addr);
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//DEVADDR = 0x4c, 0x68
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MDELAY(1);
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for (numBytes = 0x00; numBytes < len; numBytes++) {
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palm_write(I2C_PALM_ADDR, offset + numBytes);
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//I2C_PALM_ADDR:offset
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MDELAY(1);
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if (!ctr) {
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/* Trigger a READ Transaction */
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palm_write(I2C_PALM_STARTXFR, I2C_PALM_STARTXFR_RD);
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ctr++;
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}
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/* Error Conditions [Begin] */
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regVal = palm_read(I2C_PALM_STATUS);
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MDELAY(1);
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if (regVal & 0x0008) {
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printf("palm_rx: ACKERR. Aborting...\n");
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return -1;
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}
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timeOut = 10;
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while ((regVal & 0x0030) && timeOut--) {
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palm_write(I2C_PALM_STARTXFR, I2C_PALM_STARTXFR_RD);
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regVal = palm_read(I2C_PALM_STATUS);
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}
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if (timeOut == 0x00) {
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printf("palm_rx: TimedOut on Valid STARTXFR/Arbitration\n");
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return -1;
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}
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timeOut = 10;
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/* Do we have valid data from the device yet..? */
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regVal &= 0x0004;
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while (!regVal && timeOut--) {
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regVal = palm_read(I2C_PALM_STATUS) & 0x0004;
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}
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if (timeOut == 0x00) {
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printf("palm_rx: TimedOut Waiting for Valid Data\n");
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return -1;
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}
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/* Error Conditions [End] */
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/* Read the data */
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buf[numBytes] = (uint8_t) palm_read(I2C_PALM_DATAIN);
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}
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return 0;
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}
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static int
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wait_for_idle(void)
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{
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int timeOut = 0x1000;
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volatile uint32_t regVal = 0x00;
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regVal = palm_read(I2C_PALM_STATUS) & 0x0001;
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while (regVal && timeOut--) {
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regVal = palm_read(I2C_PALM_STATUS) & 0x0001;
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}
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if (timeOut == 0x00)
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return -1; /* Timed Out */
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else
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return 0;
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}
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static int
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palm_tx(uint8_t addr, uint8_t offset, uint8_t * buf, uint8_t len)
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{
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volatile uint32_t regVal = 0x00;
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int timeOut, ctr = 0x00, numBytes = len;
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for (ctr = 0x00; ctr < len; ctr++) {
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if (wait_for_idle() < 0) {
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printf("TimedOut on Waiting for I2C Bus Idle.\n");
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return -EIO;
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}
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palm_write(I2C_PALM_CFG, 0xF8);
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palm_write(I2C_PALM_BYTECNT, 0x00);
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palm_write(I2C_PALM_DEVADDR, addr);
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//0x4c, 0x68
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palm_write(I2C_PALM_ADDR, offset + numBytes - 1);
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//offset
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palm_write(I2C_PALM_DATAOUT, buf[ctr]);
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palm_write(I2C_PALM_STARTXFR, I2C_PALM_STARTXFR_WR);
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MDELAY(1);
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regVal = palm_read(I2C_PALM_STATUS);
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MDELAY(1);
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if (regVal & 0x0008) {
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printf("palm_tx: ACKERR. Aborting...\n");
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return -1;
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}
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timeOut = 0x1000;
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while (!(regVal & 0x0002) && timeOut) {
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regVal = palm_read(I2C_PALM_STATUS);
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timeOut--;
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}
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if (timeOut == 0x00) {
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printf("palm_tx: [TimeOut] SDOEMPTY Not Set\n");
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return -1;
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}
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timeOut = 1000;
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while ((regVal & 0x0030) && timeOut) {
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palm_write(I2C_PALM_STARTXFR, I2C_PALM_STARTXFR_WR);
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regVal = palm_read(I2C_PALM_STATUS);
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timeOut--;
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}
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if (timeOut == 0x00) {
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printf("palm_rx: TimedOut on Valid STARTXFR/Arbitration\n");
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return -1;
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}
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numBytes--;
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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_probe(device_t dev)
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{
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device_set_desc(dev, "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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struct xlr_i2c_softc *sc;
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int rid;
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sc = device_get_softc(dev);
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sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
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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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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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/*
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static int
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xlr_i2c_add_child(device_t dev, int order, const char *name, int unit)
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{
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printf("********* %s ******** \n", __FUNCTION__);
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device_add_child_ordered(dev, order, name, unit);
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bus_generic_attach(dev);
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return (0);
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}
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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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sc->sc_started = 1;
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current_slave = (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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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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int error = 0;
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if (palm_addr_only(current_slave, read_address) == -1) {
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printf("I2C ADDRONLY Phase Fail.\n");
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return -1;
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}
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if (palm_rx(current_slave, read_address, len, buf) == -1) {
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printf("I2C Read Fail.\n");
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return -1;
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}
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*read = len;
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return error;
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}
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static int
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xlr_i2c_write(device_t dev, char *buf, int len, int *sent, int timeout /* us */ )
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{
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int error = 0;
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uint8_t write_address;
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if (len == 1) {
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/* address for the next read */
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read_address = buf[0];
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return error;
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}
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if (len < 2)
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return (-1);
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write_address = buf[0];
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/*
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* for write operation, buf[0] contains the register offset and
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* buf[1] onwards contains the value
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*/
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palm_tx(current_slave, write_address, &buf[1], len - 1);
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return error;
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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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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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{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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