diff options
Diffstat (limited to 'sys/dev/iicbus/twsi/a10_twsi.c')
| -rw-r--r-- | sys/dev/iicbus/twsi/a10_twsi.c | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/sys/dev/iicbus/twsi/a10_twsi.c b/sys/dev/iicbus/twsi/a10_twsi.c new file mode 100644 index 0000000..f07973e --- /dev/null +++ b/sys/dev/iicbus/twsi/a10_twsi.c @@ -0,0 +1,131 @@ +/*- + * Copyright (c) 2016 Emmanuel Vadot <manu@bidouilliste.com> + * 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. + * + * THIS SOFTWARE IS PROVIDED BY 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 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. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/bus.h> +#include <sys/kernel.h> +#include <sys/module.h> +#include <sys/resource.h> + +#include <machine/bus.h> +#include <machine/resource.h> + +#include <sys/rman.h> + +#include <sys/lock.h> +#include <sys/mutex.h> + +#include <dev/iicbus/iiconf.h> +#include <dev/iicbus/iicbus.h> +#include <dev/iicbus/twsi/twsi.h> +#include <dev/ofw/ofw_bus.h> +#include <dev/ofw/ofw_bus_subr.h> + +#include <arm/allwinner/a10_clk.h> + +#include "iicbus_if.h" + +#define TWI_ADDR 0x0 +#define TWI_XADDR 0x4 +#define TWI_DATA 0x8 +#define TWI_CNTR 0xC +#define TWI_STAT 0x10 +#define TWI_CCR 0x14 +#define TWI_SRST 0x18 +#define TWI_EFR 0x1C +#define TWI_LCR 0x20 + +static int +a10_twsi_probe(device_t dev) +{ + struct twsi_softc *sc; + + sc = device_get_softc(dev); + if (!ofw_bus_status_okay(dev)) + return (ENXIO); + + if (!ofw_bus_is_compatible(dev, "allwinner,sun4i-a10-i2c")) + return (ENXIO); + + device_set_desc(dev, "Allwinner Integrated I2C Bus Controller"); + return (BUS_PROBE_DEFAULT); +} + +static int +a10_twsi_attach(device_t dev) +{ + struct twsi_softc *sc; + + sc = device_get_softc(dev); + + /* Activate clock */ + a10_clk_i2c_activate(device_get_unit(dev)); + + sc->reg_data = TWI_DATA; + sc->reg_slave_addr = TWI_ADDR; + sc->reg_slave_ext_addr = TWI_XADDR; + sc->reg_control = TWI_CNTR; + sc->reg_status = TWI_STAT; + sc->reg_baud_rate = TWI_CCR; + sc->reg_soft_reset = TWI_SRST; + + /* Setup baud rate params */ + sc->baud_rate[IIC_SLOW].param = TWSI_BAUD_RATE_PARAM(11, 2); + sc->baud_rate[IIC_FAST].param = TWSI_BAUD_RATE_PARAM(11, 2); + sc->baud_rate[IIC_FASTEST].param = TWSI_BAUD_RATE_PARAM(2, 2); + + return (twsi_attach(dev)); +} + +static phandle_t +a10_twsi_get_node(device_t bus, device_t dev) +{ + return (ofw_bus_get_node(bus)); +} + +static device_method_t a10_twsi_methods[] = { + /* device interface */ + DEVMETHOD(device_probe, a10_twsi_probe), + DEVMETHOD(device_attach, a10_twsi_attach), + + /* OFW methods */ + DEVMETHOD(ofw_bus_get_node, a10_twsi_get_node), + + { 0, 0 } +}; + +DEFINE_CLASS_1(iichb, a10_twsi_driver, a10_twsi_methods, + sizeof(struct twsi_softc), twsi_driver); + +static devclass_t a10_twsi_devclass; + +DRIVER_MODULE(a10_twsi, simplebus, a10_twsi_driver, a10_twsi_devclass, 0, 0); +DRIVER_MODULE(iicbus, a10_twsi, iicbus_driver, iicbus_devclass, 0, 0); +MODULE_DEPEND(a10_twsi, iicbus, 1, 1, 1); |
