				/*-
				* Copyright (C) 2008 MARVELL INTERNATIONAL LTD.
				* All rights reserved.
				*
				* Developed by Semihalf.
				*
				* 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 MARVELL nor the names of contributors
				* may be used to endorse or promote products derived from this software
				* without specific prior written permission.
				*
				* 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.
				*/

				/*
				* Driver for the TWSI (aka I2C, aka IIC) bus controller found on Marvell
				* and Allwinner SoCs. Supports master operation only, and works in polling mode.
				*
				* Calls to DELAY() are needed per Application Note AN-179 "TWSI Software
				* Guidelines for Discovery(TM), Horizon (TM) and Feroceon(TM) Devices".
				*/

				#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/_inttypes.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/fdt/fdt_common.h>
				#include <dev/ofw/ofw_bus.h>
				#include <dev/ofw/ofw_bus_subr.h>

				#include <arm/mv/mvreg.h>
				#include <arm/mv/mvvar.h>
				#include <dev/iicbus/twsi/twsi.h>

				#include "iicbus_if.h"

				#define MV_TWSI_NAME "twsi"
				#define IICBUS_DEVNAME "iicbus"

				#define TWSI_ADDR 0x00
				#define TWSI_DATA 0x04
				#define TWSI_CNTR 0x08
				#define TWSI_XADDR 0x10
				#define TWSI_STAT 0x0c
				#define TWSI_BAUD_RATE 0x0c
				#define TWSI_SRST 0x1c

				#define TWSI_BAUD_RATE_RAW(C,M,N) ((C)/((10*(M+1))<<(N+1)))
				#define TWSI_BAUD_RATE_SLOW 50000 /* 50kHz */
				#define TWSI_BAUD_RATE_FAST 100000 /* 100kHz */

				#define TWSI_DEBUG
				#undef TWSI_DEBUG

				#ifdef TWSI_DEBUG
				#define debugf(fmt, args...) do { printf("%s(): ", __func__); printf(fmt,##args); } while (0)
				#else
				#define debugf(fmt, args...)
				#endif

				static int mv_twsi_probe(device_t);
				static int mv_twsi_attach(device_t);

				static struct ofw_compat_data compat_data[] = {
				{ "mrvl,twsi", true },
				{ "marvell,mv64xxx-i2c", true },
				{ NULL, false }
				};

				static device_method_t mv_twsi_methods[] = {
				/* device interface */
				DEVMETHOD(device_probe, mv_twsi_probe),
				DEVMETHOD(device_attach, mv_twsi_attach),

				{ 0, 0 }
				};

				DEFINE_CLASS_1(twsi, mv_twsi_driver, mv_twsi_methods,
				sizeof(struct twsi_softc), twsi_driver);

				static devclass_t mv_twsi_devclass;

				DRIVER_MODULE(twsi, simplebus, mv_twsi_driver, mv_twsi_devclass, 0, 0);
				DRIVER_MODULE(iicbus, twsi, iicbus_driver, iicbus_devclass, 0, 0);
				MODULE_DEPEND(twsi, iicbus, 1, 1, 1);

				static int
				mv_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_search_compatible(dev, compat_data)->ocd_data)
				return (ENXIO);

				sc->reg_data = TWSI_DATA;
				sc->reg_slave_addr = TWSI_ADDR;
				sc->reg_slave_ext_addr = TWSI_XADDR;
				sc->reg_control = TWSI_CNTR;
				sc->reg_status = TWSI_STAT;
				sc->reg_baud_rate = TWSI_BAUD_RATE;
				sc->reg_soft_reset = TWSI_SRST;

				device_set_desc(dev, "Marvell Integrated I2C Bus Controller");
				return (BUS_PROBE_DEFAULT);
				}

				#define ABSSUB(a,b) (((a) > (b)) ? (a) - (b) : (b) - (a))
				static void
				mv_twsi_cal_baud_rate(const uint32_t target, struct twsi_baud_rate *rate)
				{
				uint32_t clk, cur, diff, diff0;
				int m, n, m0, n0;

				/* Calculate baud rate. */
				m0 = n0 = 4; /* Default values on reset */
				diff0 = 0xffffffff;
				clk = get_tclk();

				for (n = 0; n < 8; n++) {
				for (m = 0; m < 16; m++) {
				cur = TWSI_BAUD_RATE_RAW(clk,m,n);
				diff = ABSSUB(target, cur);
				if (diff < diff0) {
				m0 = m;
				n0 = n;
				diff0 = diff;
				}
				}
				}
				rate->raw = TWSI_BAUD_RATE_RAW(clk, m0, n0);
				rate->param = TWSI_BAUD_RATE_PARAM(m0, n0);
				rate->m = m0;
				rate->n = n0;
				}

				static int
				mv_twsi_attach(device_t dev)
				{
				struct twsi_softc *sc;
				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;

				sc = device_get_softc(dev);

				mv_twsi_cal_baud_rate(TWSI_BAUD_RATE_SLOW, &sc->baud_rate[IIC_SLOW]);
				mv_twsi_cal_baud_rate(TWSI_BAUD_RATE_FAST, &sc->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",
				sc->baud_rate[IIC_SLOW].raw / 1000,
				sc->baud_rate[IIC_SLOW].m,
				sc->baud_rate[IIC_SLOW].n,
				sc->baud_rate[IIC_FAST].raw / 1000,
				sc->baud_rate[IIC_FAST].m,
				sc->baud_rate[IIC_FAST].n);


				twsi_attach(dev);

				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))
				continue;
				error = OF_getprop(child, "model", &dname, len);
				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))
				continue;
				andrewUnsubmitted Done Inline Actions This is unneeded, and may overflow `dname`. `OF_getprop` already includes the null terminator. andrew: This is unneeded, and may overflow `dname`. `OF_getprop` already includes the null terminator.
				OF_getprop(child, "model", &dname, len);

				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);

				return (0);
				}
				andrewUnsubmitted Done Inline Actions And here andrew: And here

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