2008-10-13 20:07:13 +00:00
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/*-
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* Copyright (C) 2008 MARVELL INTERNATIONAL LTD.
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* All rights reserved.
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*
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* Developed by Semihalf.
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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 MARVELL nor the names of 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 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 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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/*
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* Driver for the TWSI (aka I2C, aka IIC) bus controller found on Marvell
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* SoCs. Supports master operation only, and works in polling mode.
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*
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* Calls to DELAY() are needed per Application Note AN-179 "TWSI Software
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* Guidelines for Discovery(TM), Horizon (TM) and Feroceon(TM) Devices".
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/resource.h>
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2012-08-21 17:49:20 +00:00
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#include <machine/_inttypes.h>
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2008-10-13 20:07:13 +00:00
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#include <machine/bus.h>
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#include <machine/resource.h>
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#include <sys/rman.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <dev/iicbus/iiconf.h>
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#include <dev/iicbus/iicbus.h>
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2012-08-21 17:49:20 +00:00
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#include <dev/fdt/fdt_common.h>
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2010-06-13 13:28:53 +00:00
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#include <dev/ofw/ofw_bus.h>
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#include <dev/ofw/ofw_bus_subr.h>
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2012-08-21 17:49:20 +00:00
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#include <arm/mv/mvreg.h>
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#include <arm/mv/mvvar.h>
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2008-10-13 20:07:13 +00:00
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#include "iicbus_if.h"
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#define MV_TWSI_NAME "twsi"
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2012-08-21 17:49:20 +00:00
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#define IICBUS_DEVNAME "iicbus"
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2008-10-13 20:07:13 +00:00
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#define TWSI_SLAVE_ADDR 0x00
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#define TWSI_EXT_SLAVE_ADDR 0x10
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#define TWSI_DATA 0x04
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#define TWSI_CONTROL 0x08
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#define TWSI_CONTROL_ACK (1 << 2)
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#define TWSI_CONTROL_IFLG (1 << 3)
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#define TWSI_CONTROL_STOP (1 << 4)
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#define TWSI_CONTROL_START (1 << 5)
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#define TWSI_CONTROL_TWSIEN (1 << 6)
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#define TWSI_CONTROL_INTEN (1 << 7)
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#define TWSI_STATUS 0x0c
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#define TWSI_STATUS_START 0x08
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#define TWSI_STATUS_RPTD_START 0x10
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#define TWSI_STATUS_ADDR_W_ACK 0x18
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#define TWSI_STATUS_DATA_WR_ACK 0x28
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#define TWSI_STATUS_ADDR_R_ACK 0x40
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#define TWSI_STATUS_DATA_RD_ACK 0x50
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#define TWSI_STATUS_DATA_RD_NOACK 0x58
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#define TWSI_BAUD_RATE 0x0c
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2012-08-21 17:49:20 +00:00
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#define TWSI_BAUD_RATE_PARAM(M,N) ((((M) << 3) | ((N) & 0x7)) & 0x7f)
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#define TWSI_BAUD_RATE_RAW(C,M,N) ((C)/((10*(M+1))<<(N+1)))
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#define TWSI_BAUD_RATE_SLOW 50000 /* 50kHz */
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#define TWSI_BAUD_RATE_FAST 100000 /* 100kHz */
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2008-10-13 20:07:13 +00:00
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#define TWSI_SOFT_RESET 0x1c
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#define TWSI_DEBUG
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#undef TWSI_DEBUG
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#ifdef TWSI_DEBUG
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#define debugf(fmt, args...) do { printf("%s(): ", __func__); printf(fmt,##args); } while (0)
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#else
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#define debugf(fmt, args...)
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#endif
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struct mv_twsi_softc {
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device_t dev;
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struct resource *res[1]; /* SYS_RES_MEMORY */
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struct mtx mutex;
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device_t iicbus;
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};
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2012-08-21 17:49:20 +00:00
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static struct mv_twsi_baud_rate {
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uint32_t raw;
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int param;
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int m;
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int n;
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} baud_rate[IIC_FASTEST + 1];
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2008-10-13 20:07:13 +00:00
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static int mv_twsi_probe(device_t);
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static int mv_twsi_attach(device_t);
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static int mv_twsi_detach(device_t);
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static int mv_twsi_reset(device_t dev, u_char speed, u_char addr,
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u_char *oldaddr);
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static int mv_twsi_repeated_start(device_t dev, u_char slave, int timeout);
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static int mv_twsi_start(device_t dev, u_char slave, int timeout);
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static int mv_twsi_stop(device_t dev);
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static int mv_twsi_read(device_t dev, char *buf, int len, int *read, int last,
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int delay);
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2009-06-11 17:05:13 +00:00
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static int mv_twsi_write(device_t dev, const char *buf, int len, int *sent,
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2008-10-13 20:07:13 +00:00
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int timeout);
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static struct resource_spec res_spec[] = {
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{ SYS_RES_MEMORY, 0, RF_ACTIVE },
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{ -1, 0 }
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};
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static device_method_t mv_twsi_methods[] = {
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/* device interface */
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DEVMETHOD(device_probe, mv_twsi_probe),
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DEVMETHOD(device_attach, mv_twsi_attach),
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DEVMETHOD(device_detach, mv_twsi_detach),
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/* iicbus interface */
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DEVMETHOD(iicbus_callback, iicbus_null_callback),
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DEVMETHOD(iicbus_repeated_start, mv_twsi_repeated_start),
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DEVMETHOD(iicbus_start, mv_twsi_start),
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DEVMETHOD(iicbus_stop, mv_twsi_stop),
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DEVMETHOD(iicbus_write, mv_twsi_write),
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DEVMETHOD(iicbus_read, mv_twsi_read),
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DEVMETHOD(iicbus_reset, mv_twsi_reset),
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DEVMETHOD(iicbus_transfer, iicbus_transfer_gen),
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{ 0, 0 }
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};
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static devclass_t mv_twsi_devclass;
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static driver_t mv_twsi_driver = {
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MV_TWSI_NAME,
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mv_twsi_methods,
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sizeof(struct mv_twsi_softc),
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};
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2010-06-13 13:28:53 +00:00
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DRIVER_MODULE(twsi, simplebus, mv_twsi_driver, mv_twsi_devclass, 0, 0);
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2008-10-13 20:07:13 +00:00
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DRIVER_MODULE(iicbus, twsi, iicbus_driver, iicbus_devclass, 0, 0);
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MODULE_DEPEND(twsi, iicbus, 1, 1, 1);
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static __inline uint32_t
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TWSI_READ(struct mv_twsi_softc *sc, bus_size_t off)
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{
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return (bus_read_4(sc->res[0], off));
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}
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static __inline void
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TWSI_WRITE(struct mv_twsi_softc *sc, bus_size_t off, uint32_t val)
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{
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bus_write_4(sc->res[0], off, val);
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}
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static __inline void
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twsi_control_clear(struct mv_twsi_softc *sc, uint32_t mask)
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{
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uint32_t val;
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val = TWSI_READ(sc, TWSI_CONTROL);
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val &= ~mask;
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TWSI_WRITE(sc, TWSI_CONTROL, val);
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}
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static __inline void
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twsi_control_set(struct mv_twsi_softc *sc, uint32_t mask)
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{
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uint32_t val;
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val = TWSI_READ(sc, TWSI_CONTROL);
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val |= mask;
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TWSI_WRITE(sc, TWSI_CONTROL, val);
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}
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static __inline void
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twsi_clear_iflg(struct mv_twsi_softc *sc)
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{
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DELAY(1000);
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twsi_control_clear(sc, TWSI_CONTROL_IFLG);
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DELAY(1000);
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}
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/*
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* timeout given in us
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* returns
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* 0 on sucessfull mask change
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* non-zero on timeout
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*/
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static int
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twsi_poll_ctrl(struct mv_twsi_softc *sc, int timeout, uint32_t mask)
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{
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timeout /= 10;
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while (!(TWSI_READ(sc, TWSI_CONTROL) & mask)) {
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DELAY(10);
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if (--timeout < 0)
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return (timeout);
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}
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return (0);
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}
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/*
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* 'timeout' is given in us. Note also that timeout handling is not exact --
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* twsi_locked_start() total wait can be more than 2 x timeout
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* (twsi_poll_ctrl() is called twice). 'mask' can be either TWSI_STATUS_START
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* or TWSI_STATUS_RPTD_START
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*/
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static int
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twsi_locked_start(device_t dev, struct mv_twsi_softc *sc, int32_t mask,
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u_char slave, int timeout)
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{
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int read_access, iflg_set = 0;
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uint32_t status;
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mtx_assert(&sc->mutex, MA_OWNED);
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if (mask == TWSI_STATUS_RPTD_START)
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/* read IFLG to know if it should be cleared later; from NBSD */
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iflg_set = TWSI_READ(sc, TWSI_CONTROL) & TWSI_CONTROL_IFLG;
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twsi_control_set(sc, TWSI_CONTROL_START);
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if (mask == TWSI_STATUS_RPTD_START && iflg_set) {
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debugf("IFLG set, clearing\n");
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twsi_clear_iflg(sc);
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}
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/*
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* Without this delay we timeout checking IFLG if the timeout is 0.
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* NBSD driver always waits here too.
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*/
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DELAY(1000);
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if (twsi_poll_ctrl(sc, timeout, TWSI_CONTROL_IFLG)) {
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debugf("timeout sending %sSTART condition\n",
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mask == TWSI_STATUS_START ? "" : "repeated ");
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return (IIC_ETIMEOUT);
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}
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status = TWSI_READ(sc, TWSI_STATUS);
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if (status != mask) {
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debugf("wrong status (%02x) after sending %sSTART condition\n",
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status, mask == TWSI_STATUS_START ? "" : "repeated ");
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return (IIC_ESTATUS);
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}
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TWSI_WRITE(sc, TWSI_DATA, slave);
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DELAY(1000);
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twsi_clear_iflg(sc);
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if (twsi_poll_ctrl(sc, timeout, TWSI_CONTROL_IFLG)) {
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debugf("timeout sending slave address\n");
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return (IIC_ETIMEOUT);
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}
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read_access = (slave & 0x1) ? 1 : 0;
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status = TWSI_READ(sc, TWSI_STATUS);
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if (status != (read_access ?
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TWSI_STATUS_ADDR_R_ACK : TWSI_STATUS_ADDR_W_ACK)) {
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debugf("no ACK (status: %02x) after sending slave address\n",
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status);
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return (IIC_ENOACK);
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}
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return (IIC_NOERR);
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}
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static int
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mv_twsi_probe(device_t dev)
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{
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2010-06-13 13:28:53 +00:00
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if (!ofw_bus_is_compatible(dev, "mrvl,twsi"))
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return (ENXIO);
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2008-10-13 20:07:13 +00:00
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device_set_desc(dev, "Marvell Integrated I2C Bus Controller");
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return (BUS_PROBE_DEFAULT);
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}
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2012-08-21 17:49:20 +00:00
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#define ABSSUB(a,b) (((a) > (b)) ? (a) - (b) : (b) - (a))
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static void
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mv_twsi_cal_baud_rate(const uint32_t target, struct mv_twsi_baud_rate *rate)
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{
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uint32_t clk, cur, diff, diff0;
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int m, n, m0, n0;
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/* Calculate baud rate. */
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m0 = n0 = 4; /* Default values on reset */
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diff0 = 0xffffffff;
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clk = get_tclk();
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for (n = 0; n < 8; n++) {
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for (m = 0; m < 16; m++) {
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cur = TWSI_BAUD_RATE_RAW(clk,m,n);
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diff = ABSSUB(target, cur);
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if (diff < diff0) {
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m0 = m;
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n0 = n;
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diff0 = diff;
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}
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}
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}
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rate->raw = TWSI_BAUD_RATE_RAW(clk, m0, n0);
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rate->param = TWSI_BAUD_RATE_PARAM(m0, n0);
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rate->m = m0;
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rate->n = n0;
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}
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2008-10-13 20:07:13 +00:00
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static int
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mv_twsi_attach(device_t dev)
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|
{
|
|
|
|
struct mv_twsi_softc *sc;
|
2012-08-21 17:49:20 +00:00
|
|
|
phandle_t child, iicbusnode;
|
|
|
|
device_t childdev;
|
|
|
|
struct iicbus_ivar *devi;
|
|
|
|
char dname[32]; /* 32 is taken from struct u_device */
|
|
|
|
uint32_t paddr;
|
|
|
|
int len, error;
|
2008-10-13 20:07:13 +00:00
|
|
|
|
|
|
|
sc = device_get_softc(dev);
|
|
|
|
sc->dev = dev;
|
2012-08-21 17:49:20 +00:00
|
|
|
bzero(baud_rate, sizeof(baud_rate));
|
2008-10-13 20:07:13 +00:00
|
|
|
|
|
|
|
mtx_init(&sc->mutex, device_get_nameunit(dev), MV_TWSI_NAME, MTX_DEF);
|
|
|
|
|
|
|
|
/* Allocate IO resources */
|
|
|
|
if (bus_alloc_resources(dev, res_spec, sc->res)) {
|
|
|
|
device_printf(dev, "could not allocate resources\n");
|
|
|
|
mv_twsi_detach(dev);
|
|
|
|
return (ENXIO);
|
|
|
|
}
|
|
|
|
|
2012-08-21 17:49:20 +00:00
|
|
|
mv_twsi_cal_baud_rate(TWSI_BAUD_RATE_SLOW, &baud_rate[IIC_SLOW]);
|
|
|
|
mv_twsi_cal_baud_rate(TWSI_BAUD_RATE_FAST, &baud_rate[IIC_FAST]);
|
|
|
|
if (bootverbose)
|
|
|
|
device_printf(dev, "calculated baud rates are:\n"
|
|
|
|
" %" PRIu32 " kHz (M=%d, N=%d) for slow,\n"
|
|
|
|
" %" PRIu32 " kHz (M=%d, N=%d) for fast.\n",
|
|
|
|
baud_rate[IIC_SLOW].raw / 1000,
|
|
|
|
baud_rate[IIC_SLOW].m,
|
|
|
|
baud_rate[IIC_SLOW].n,
|
|
|
|
baud_rate[IIC_FAST].raw / 1000,
|
|
|
|
baud_rate[IIC_FAST].m,
|
|
|
|
baud_rate[IIC_FAST].n);
|
|
|
|
|
|
|
|
sc->iicbus = device_add_child(dev, IICBUS_DEVNAME, -1);
|
2008-10-13 20:07:13 +00:00
|
|
|
if (sc->iicbus == NULL) {
|
|
|
|
device_printf(dev, "could not add iicbus child\n");
|
|
|
|
mv_twsi_detach(dev);
|
|
|
|
return (ENXIO);
|
|
|
|
}
|
2012-08-21 17:49:20 +00:00
|
|
|
/* Attach iicbus. */
|
2008-10-13 20:07:13 +00:00
|
|
|
bus_generic_attach(dev);
|
2012-08-21 17:49:20 +00:00
|
|
|
|
|
|
|
iicbusnode = 0;
|
|
|
|
/* Find iicbus as the child devices in the device tree. */
|
|
|
|
for (child = OF_child(ofw_bus_get_node(dev)); child != 0;
|
|
|
|
child = OF_peer(child)) {
|
|
|
|
len = OF_getproplen(child, "model");
|
|
|
|
if (len <= 0 || len > sizeof(dname) - 1)
|
|
|
|
continue;
|
|
|
|
error = OF_getprop(child, "model", &dname, len);
|
|
|
|
dname[len + 1] = '\0';
|
|
|
|
if (error == -1)
|
|
|
|
continue;
|
|
|
|
len = strlen(dname);
|
|
|
|
if (len == strlen(IICBUS_DEVNAME) &&
|
|
|
|
strncasecmp(dname, IICBUS_DEVNAME, len) == 0) {
|
|
|
|
iicbusnode = child;
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
if (iicbusnode == 0)
|
|
|
|
goto attach_end;
|
|
|
|
|
|
|
|
/* Attach child devices onto iicbus. */
|
|
|
|
for (child = OF_child(iicbusnode); child != 0; child = OF_peer(child)) {
|
|
|
|
/* Get slave address. */
|
|
|
|
error = OF_getprop(child, "i2c-address", &paddr, sizeof(paddr));
|
|
|
|
if (error == -1)
|
|
|
|
error = OF_getprop(child, "reg", &paddr, sizeof(paddr));
|
|
|
|
if (error == -1)
|
|
|
|
continue;
|
|
|
|
|
|
|
|
/* Get device driver name. */
|
|
|
|
len = OF_getproplen(child, "model");
|
|
|
|
if (len <= 0 || len > sizeof(dname) - 1)
|
|
|
|
continue;
|
|
|
|
OF_getprop(child, "model", &dname, len);
|
|
|
|
dname[len + 1] = '\0';
|
|
|
|
|
|
|
|
if (bootverbose)
|
|
|
|
device_printf(dev, "adding a device %s at %d.\n",
|
|
|
|
dname, fdt32_to_cpu(paddr));
|
|
|
|
childdev = BUS_ADD_CHILD(sc->iicbus, 0, dname, -1);
|
|
|
|
devi = IICBUS_IVAR(childdev);
|
|
|
|
devi->addr = fdt32_to_cpu(paddr);
|
|
|
|
}
|
|
|
|
|
|
|
|
attach_end:
|
|
|
|
bus_generic_attach(sc->iicbus);
|
|
|
|
|
2008-10-13 20:07:13 +00:00
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
mv_twsi_detach(device_t dev)
|
|
|
|
{
|
|
|
|
struct mv_twsi_softc *sc;
|
|
|
|
int rv;
|
|
|
|
|
|
|
|
sc = device_get_softc(dev);
|
|
|
|
|
|
|
|
if ((rv = bus_generic_detach(dev)) != 0)
|
|
|
|
return (rv);
|
|
|
|
|
|
|
|
if (sc->iicbus != NULL)
|
|
|
|
if ((rv = device_delete_child(dev, sc->iicbus)) != 0)
|
|
|
|
return (rv);
|
|
|
|
|
|
|
|
bus_release_resources(dev, res_spec, sc->res);
|
|
|
|
|
|
|
|
mtx_destroy(&sc->mutex);
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Only slave mode supported, disregard [old]addr
|
|
|
|
*/
|
|
|
|
static int
|
|
|
|
mv_twsi_reset(device_t dev, u_char speed, u_char addr, u_char *oldaddr)
|
|
|
|
{
|
|
|
|
struct mv_twsi_softc *sc;
|
2012-08-21 17:49:20 +00:00
|
|
|
uint32_t param;
|
2008-10-13 20:07:13 +00:00
|
|
|
|
|
|
|
sc = device_get_softc(dev);
|
|
|
|
|
|
|
|
switch (speed) {
|
|
|
|
case IIC_SLOW:
|
|
|
|
case IIC_FAST:
|
2012-08-21 17:49:20 +00:00
|
|
|
param = baud_rate[speed].param;
|
2008-10-13 20:07:13 +00:00
|
|
|
break;
|
|
|
|
case IIC_FASTEST:
|
2012-08-21 17:49:20 +00:00
|
|
|
case IIC_UNKNOWN:
|
2008-10-13 20:07:13 +00:00
|
|
|
default:
|
2012-08-21 17:49:20 +00:00
|
|
|
param = baud_rate[IIC_FAST].param;
|
2008-10-13 20:07:13 +00:00
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
mtx_lock(&sc->mutex);
|
|
|
|
TWSI_WRITE(sc, TWSI_SOFT_RESET, 0x0);
|
|
|
|
DELAY(2000);
|
2012-08-21 17:49:20 +00:00
|
|
|
TWSI_WRITE(sc, TWSI_BAUD_RATE, param);
|
2008-10-13 20:07:13 +00:00
|
|
|
TWSI_WRITE(sc, TWSI_CONTROL, TWSI_CONTROL_TWSIEN | TWSI_CONTROL_ACK);
|
|
|
|
DELAY(1000);
|
|
|
|
mtx_unlock(&sc->mutex);
|
|
|
|
|
|
|
|
return (0);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* timeout is given in us
|
|
|
|
*/
|
|
|
|
static int
|
|
|
|
mv_twsi_repeated_start(device_t dev, u_char slave, int timeout)
|
|
|
|
{
|
|
|
|
struct mv_twsi_softc *sc;
|
|
|
|
int rv;
|
|
|
|
|
|
|
|
sc = device_get_softc(dev);
|
|
|
|
|
|
|
|
mtx_lock(&sc->mutex);
|
|
|
|
rv = twsi_locked_start(dev, sc, TWSI_STATUS_RPTD_START, slave,
|
|
|
|
timeout);
|
|
|
|
mtx_unlock(&sc->mutex);
|
|
|
|
|
|
|
|
if (rv) {
|
|
|
|
mv_twsi_stop(dev);
|
|
|
|
return (rv);
|
|
|
|
} else
|
|
|
|
return (IIC_NOERR);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* timeout is given in us
|
|
|
|
*/
|
|
|
|
static int
|
|
|
|
mv_twsi_start(device_t dev, u_char slave, int timeout)
|
|
|
|
{
|
|
|
|
struct mv_twsi_softc *sc;
|
|
|
|
int rv;
|
|
|
|
|
|
|
|
sc = device_get_softc(dev);
|
|
|
|
|
|
|
|
mtx_lock(&sc->mutex);
|
|
|
|
rv = twsi_locked_start(dev, sc, TWSI_STATUS_START, slave, timeout);
|
|
|
|
mtx_unlock(&sc->mutex);
|
|
|
|
|
|
|
|
if (rv) {
|
|
|
|
mv_twsi_stop(dev);
|
|
|
|
return (rv);
|
|
|
|
} else
|
|
|
|
return (IIC_NOERR);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
mv_twsi_stop(device_t dev)
|
|
|
|
{
|
|
|
|
struct mv_twsi_softc *sc;
|
|
|
|
|
|
|
|
sc = device_get_softc(dev);
|
|
|
|
|
|
|
|
mtx_lock(&sc->mutex);
|
|
|
|
twsi_control_set(sc, TWSI_CONTROL_STOP);
|
|
|
|
DELAY(1000);
|
|
|
|
twsi_clear_iflg(sc);
|
|
|
|
mtx_unlock(&sc->mutex);
|
|
|
|
|
|
|
|
return (IIC_NOERR);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
|
|
|
mv_twsi_read(device_t dev, char *buf, int len, int *read, int last, int delay)
|
|
|
|
{
|
|
|
|
struct mv_twsi_softc *sc;
|
|
|
|
uint32_t status;
|
|
|
|
int last_byte, rv;
|
|
|
|
|
|
|
|
sc = device_get_softc(dev);
|
|
|
|
|
|
|
|
mtx_lock(&sc->mutex);
|
|
|
|
*read = 0;
|
|
|
|
while (*read < len) {
|
|
|
|
/*
|
|
|
|
* Check if we are reading last byte of the last buffer,
|
|
|
|
* do not send ACK then, per I2C specs
|
|
|
|
*/
|
|
|
|
last_byte = ((*read == len - 1) && last) ? 1 : 0;
|
|
|
|
if (last_byte)
|
|
|
|
twsi_control_clear(sc, TWSI_CONTROL_ACK);
|
|
|
|
else
|
|
|
|
twsi_control_set(sc, TWSI_CONTROL_ACK);
|
|
|
|
|
|
|
|
DELAY (1000);
|
|
|
|
twsi_clear_iflg(sc);
|
|
|
|
|
|
|
|
if (twsi_poll_ctrl(sc, delay, TWSI_CONTROL_IFLG)) {
|
|
|
|
debugf("timeout reading data\n");
|
|
|
|
rv = IIC_ETIMEOUT;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
status = TWSI_READ(sc, TWSI_STATUS);
|
|
|
|
if (status != (last_byte ?
|
|
|
|
TWSI_STATUS_DATA_RD_NOACK : TWSI_STATUS_DATA_RD_ACK)) {
|
|
|
|
debugf("wrong status (%02x) while reading\n", status);
|
|
|
|
rv = IIC_ESTATUS;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
*buf++ = TWSI_READ(sc, TWSI_DATA);
|
|
|
|
(*read)++;
|
|
|
|
}
|
|
|
|
rv = IIC_NOERR;
|
|
|
|
out:
|
|
|
|
mtx_unlock(&sc->mutex);
|
|
|
|
return (rv);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int
|
2009-06-11 17:05:13 +00:00
|
|
|
mv_twsi_write(device_t dev, const char *buf, int len, int *sent, int timeout)
|
2008-10-13 20:07:13 +00:00
|
|
|
{
|
|
|
|
struct mv_twsi_softc *sc;
|
|
|
|
uint32_t status;
|
|
|
|
int rv;
|
|
|
|
|
|
|
|
sc = device_get_softc(dev);
|
|
|
|
|
|
|
|
mtx_lock(&sc->mutex);
|
|
|
|
*sent = 0;
|
|
|
|
while (*sent < len) {
|
|
|
|
TWSI_WRITE(sc, TWSI_DATA, *buf++);
|
|
|
|
|
|
|
|
twsi_clear_iflg(sc);
|
|
|
|
if (twsi_poll_ctrl(sc, timeout, TWSI_CONTROL_IFLG)) {
|
|
|
|
debugf("timeout writing data\n");
|
|
|
|
rv = IIC_ETIMEOUT;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
status = TWSI_READ(sc, TWSI_STATUS);
|
|
|
|
if (status != TWSI_STATUS_DATA_WR_ACK) {
|
|
|
|
debugf("wrong status (%02x) while writing\n", status);
|
|
|
|
rv = IIC_ESTATUS;
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
(*sent)++;
|
|
|
|
}
|
|
|
|
rv = IIC_NOERR;
|
|
|
|
out:
|
|
|
|
mtx_unlock(&sc->mutex);
|
|
|
|
return (rv);
|
|
|
|
}
|