diff options
Diffstat (limited to 'sys/mips/rmi/xlr_i2c.c')
-rw-r--r-- | sys/mips/rmi/xlr_i2c.c | 455 |
1 files changed, 455 insertions, 0 deletions
diff --git a/sys/mips/rmi/xlr_i2c.c b/sys/mips/rmi/xlr_i2c.c new file mode 100644 index 0000000..d05345e --- /dev/null +++ b/sys/mips/rmi/xlr_i2c.c @@ -0,0 +1,455 @@ +/*- + * 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); |