13e3657b7b
- Just grab Giant in the ixp425_iic(4) driver since this driver uses
a shared address/data register window pair to access the actual
I2C registers. None of the other ixp425 drivers lock access to these
shared address/data registers yet and that would need to be done before
this could use any meaningful locking.
- Add locking to the interrupt handler and 'iicbus_reset' methods of the
at91_twi(4) driver.
- Add locking to the pcf(4) driver. Other pcf(4) fixes include:
- Don't needlessly zero the softc.
- Use bus_foo rather than bus_space_foo and remove bus space tag and
handle from softc.
- The lpbb(4) driver just grabs Giant for now. This will be refined later
when ppbus(4) is locked.
- As was done with smbus earlier, move the DRIVER_MODULE() lines to match
the bus driver (either iicbus or iicbb) to the bridge driver into the
bridge drivers.
Tested by: sam (arm/ixp425)
196 lines
5.0 KiB
C
196 lines
5.0 KiB
C
/*
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* Copyright (c) 2006 Kevin Lo. 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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*
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* THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL WASABI SYSTEMS, INC
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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/kernel.h>
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#include <sys/module.h>
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#include <sys/bus.h>
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#include <sys/uio.h>
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#include <arm/xscale/ixp425/ixp425reg.h>
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#include <arm/xscale/ixp425/ixp425var.h>
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#include <arm/xscale/ixp425/ixdp425reg.h>
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#include <dev/iicbus/iiconf.h>
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#include <dev/iicbus/iicbus.h>
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#include "iicbb_if.h"
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#define I2C_DELAY 10
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/* bit clr/set shorthands */
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#define GPIO_CONF_CLR(sc, reg, mask) \
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GPIO_CONF_WRITE_4(sc, reg, GPIO_CONF_READ_4(sc, reg) &~ (mask))
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#define GPIO_CONF_SET(sc, reg, mask) \
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GPIO_CONF_WRITE_4(sc, reg, GPIO_CONF_READ_4(sc, reg) | (mask))
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struct ixpiic_softc {
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device_t sc_dev;
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bus_space_tag_t sc_iot;
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bus_space_handle_t sc_gpio_ioh;
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device_t iicbb;
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};
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static struct ixpiic_softc *ixpiic_sc = NULL;
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static int
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ixpiic_probe(device_t dev)
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{
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device_set_desc(dev, "IXP425 GPIO-Based I2C Interface");
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return (0);
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}
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static int
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ixpiic_attach(device_t dev)
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{
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struct ixpiic_softc *sc = device_get_softc(dev);
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struct ixp425_softc *sa = device_get_softc(device_get_parent(dev));
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ixpiic_sc = sc;
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sc->sc_dev = dev;
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sc->sc_iot = sa->sc_iot;
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sc->sc_gpio_ioh = sa->sc_gpio_ioh;
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GPIO_CONF_SET(sc, IXP425_GPIO_GPOER,
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GPIO_I2C_SCL_BIT | GPIO_I2C_SDA_BIT);
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GPIO_CONF_CLR(sc, IXP425_GPIO_GPOUTR,
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GPIO_I2C_SCL_BIT | GPIO_I2C_SDA_BIT);
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/* add generic bit-banging code */
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if ((sc->iicbb = device_add_child(dev, "iicbb", -1)) == NULL)
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device_printf(dev, "could not add iicbb\n");
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/* probe and attach the bit-banging code */
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device_probe_and_attach(sc->iicbb);
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return (0);
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}
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static int
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ixpiic_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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ixpiic_getscl(device_t dev)
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{
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struct ixpiic_softc *sc = ixpiic_sc;
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uint32_t reg;
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mtx_lock(&Giant);
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GPIO_CONF_SET(sc, IXP425_GPIO_GPOER, GPIO_I2C_SCL_BIT);
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reg = GPIO_CONF_READ_4(sc, IXP425_GPIO_GPINR);
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mtx_unlock(&Giant);
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return (reg & GPIO_I2C_SCL_BIT);
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}
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static int
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ixpiic_getsda(device_t dev)
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{
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struct ixpiic_softc *sc = ixpiic_sc;
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uint32_t reg;
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mtx_lock(&Giant);
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GPIO_CONF_SET(sc, IXP425_GPIO_GPOER, GPIO_I2C_SDA_BIT);
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reg = GPIO_CONF_READ_4(sc, IXP425_GPIO_GPINR);
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mtx_unlock(&Giant);
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return (reg & GPIO_I2C_SDA_BIT);
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}
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static void
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ixpiic_setsda(device_t dev, char val)
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{
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struct ixpiic_softc *sc = ixpiic_sc;
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mtx_lock(&Giant);
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GPIO_CONF_CLR(sc, IXP425_GPIO_GPOUTR, GPIO_I2C_SDA_BIT);
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if (val)
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GPIO_CONF_SET(sc, IXP425_GPIO_GPOER, GPIO_I2C_SDA_BIT);
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else
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GPIO_CONF_CLR(sc, IXP425_GPIO_GPOER, GPIO_I2C_SDA_BIT);
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mtx_unlock(&Giant);
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DELAY(I2C_DELAY);
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}
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static void
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ixpiic_setscl(device_t dev, char val)
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{
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struct ixpiic_softc *sc = ixpiic_sc;
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mtx_lock(&Giant);
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GPIO_CONF_CLR(sc, IXP425_GPIO_GPOUTR, GPIO_I2C_SCL_BIT);
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if (val)
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GPIO_CONF_SET(sc, IXP425_GPIO_GPOER, GPIO_I2C_SCL_BIT);
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else
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GPIO_CONF_CLR(sc, IXP425_GPIO_GPOER, GPIO_I2C_SCL_BIT);
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mtx_unlock(&Giant);
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DELAY(I2C_DELAY);
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}
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static int
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ixpiic_reset(device_t dev, u_char speed, u_char addr, u_char *oldaddr)
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{
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/* reset bus */
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ixpiic_setsda(dev, 1);
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ixpiic_setscl(dev, 1);
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return (IIC_ENOADDR);
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}
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static device_method_t ixpiic_methods[] = {
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/* device interface */
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DEVMETHOD(device_probe, ixpiic_probe),
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DEVMETHOD(device_attach, ixpiic_attach),
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/* iicbb interface */
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DEVMETHOD(iicbb_callback, ixpiic_callback),
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DEVMETHOD(iicbb_setsda, ixpiic_setsda),
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DEVMETHOD(iicbb_setscl, ixpiic_setscl),
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DEVMETHOD(iicbb_getsda, ixpiic_getsda),
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DEVMETHOD(iicbb_getscl, ixpiic_getscl),
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DEVMETHOD(iicbb_reset, ixpiic_reset),
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{ 0, 0 }
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};
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static driver_t ixpiic_driver = {
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"ixpiic",
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ixpiic_methods,
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sizeof(struct ixpiic_softc),
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};
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static devclass_t ixpiic_devclass;
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DRIVER_MODULE(ixpiic, ixp, ixpiic_driver, ixpiic_devclass, 0, 0);
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DRIVER_MODULE(iicbb, ixpiic, iicbb_driver, iicbb_devclass, 0, 0);
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