1295626Sandrew/*- 2331182Seadler * Copyright (c) 2016 Emmanuel Vadot <manu@freebsd.org> 3295626Sandrew * All rights reserved. 4295626Sandrew * 5295626Sandrew * Redistribution and use in source and binary forms, with or without 6295626Sandrew * modification, are permitted provided that the following conditions 7295626Sandrew * are met: 8295626Sandrew * 1. Redistributions of source code must retain the above copyright 9295626Sandrew * notice, this list of conditions and the following disclaimer. 10295626Sandrew * 2. Redistributions in binary form must reproduce the above copyright 11295626Sandrew * notice, this list of conditions and the following disclaimer in the 12295626Sandrew * documentation and/or other materials provided with the distribution. 13295626Sandrew * 14295626Sandrew * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15295626Sandrew * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16295626Sandrew * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17295626Sandrew * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 18295626Sandrew * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19295626Sandrew * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20295626Sandrew * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21295626Sandrew * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22295626Sandrew * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23295626Sandrew * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24295626Sandrew * SUCH DAMAGE. 25295626Sandrew */ 26295626Sandrew 27295626Sandrew#include <sys/cdefs.h> 28295626Sandrew__FBSDID("$FreeBSD: stable/11/sys/dev/iicbus/twsi/a10_twsi.c 331182 2018-03-19 06:40:11Z eadler $"); 29295626Sandrew 30295626Sandrew#include <sys/param.h> 31295626Sandrew#include <sys/systm.h> 32295626Sandrew#include <sys/bus.h> 33295626Sandrew#include <sys/kernel.h> 34295626Sandrew#include <sys/module.h> 35295626Sandrew#include <sys/resource.h> 36295626Sandrew 37295626Sandrew#include <machine/bus.h> 38295626Sandrew#include <machine/resource.h> 39295626Sandrew 40295626Sandrew#include <sys/rman.h> 41295626Sandrew 42295626Sandrew#include <sys/lock.h> 43295626Sandrew#include <sys/mutex.h> 44295626Sandrew 45295626Sandrew#include <dev/iicbus/iiconf.h> 46295626Sandrew#include <dev/iicbus/iicbus.h> 47295626Sandrew#include <dev/iicbus/twsi/twsi.h> 48295626Sandrew#include <dev/ofw/ofw_bus.h> 49295626Sandrew#include <dev/ofw/ofw_bus_subr.h> 50295626Sandrew 51297627Sjmcneill#include <dev/extres/clk/clk.h> 52297627Sjmcneill#include <dev/extres/hwreset/hwreset.h> 53295626Sandrew 54295626Sandrew#include "iicbus_if.h" 55295626Sandrew 56295626Sandrew#define TWI_ADDR 0x0 57295626Sandrew#define TWI_XADDR 0x4 58295626Sandrew#define TWI_DATA 0x8 59295626Sandrew#define TWI_CNTR 0xC 60295626Sandrew#define TWI_STAT 0x10 61295626Sandrew#define TWI_CCR 0x14 62295626Sandrew#define TWI_SRST 0x18 63295626Sandrew#define TWI_EFR 0x1C 64295626Sandrew#define TWI_LCR 0x20 65295626Sandrew 66296093Sandrewstatic struct ofw_compat_data compat_data[] = { 67297627Sjmcneill {"allwinner,sun4i-a10-i2c", 1}, 68297627Sjmcneill {"allwinner,sun6i-a31-i2c", 1}, 69299745Sjmcneill {"allwinner,sun8i-a83t-i2c", 1}, 70296093Sandrew {NULL, 0}, 71296093Sandrew}; 72296093Sandrew 73295626Sandrewstatic int 74295626Sandrewa10_twsi_probe(device_t dev) 75295626Sandrew{ 76295626Sandrew 77295626Sandrew if (!ofw_bus_status_okay(dev)) 78295626Sandrew return (ENXIO); 79295626Sandrew 80296093Sandrew if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 81295626Sandrew return (ENXIO); 82295626Sandrew 83295626Sandrew device_set_desc(dev, "Allwinner Integrated I2C Bus Controller"); 84295626Sandrew return (BUS_PROBE_DEFAULT); 85295626Sandrew} 86295626Sandrew 87295626Sandrewstatic int 88295626Sandrewa10_twsi_attach(device_t dev) 89295626Sandrew{ 90295626Sandrew struct twsi_softc *sc; 91297627Sjmcneill clk_t clk; 92297627Sjmcneill hwreset_t rst; 93297627Sjmcneill int error; 94295626Sandrew 95295626Sandrew sc = device_get_softc(dev); 96295626Sandrew 97297627Sjmcneill /* De-assert reset */ 98308324Smmel if (hwreset_get_by_ofw_idx(dev, 0, 0, &rst) == 0) { 99297627Sjmcneill error = hwreset_deassert(rst); 100297627Sjmcneill if (error != 0) { 101297627Sjmcneill device_printf(dev, "could not de-assert reset\n"); 102297627Sjmcneill return (error); 103297627Sjmcneill } 104296093Sandrew } 105295626Sandrew 106297627Sjmcneill /* Activate clock */ 107308324Smmel error = clk_get_by_ofw_index(dev, 0, 0, &clk); 108297627Sjmcneill if (error != 0) { 109297627Sjmcneill device_printf(dev, "could not find clock\n"); 110297627Sjmcneill return (error); 111296093Sandrew } 112297627Sjmcneill error = clk_enable(clk); 113297627Sjmcneill if (error != 0) { 114297627Sjmcneill device_printf(dev, "could not enable clock\n"); 115297627Sjmcneill return (error); 116297627Sjmcneill } 117296093Sandrew 118295626Sandrew sc->reg_data = TWI_DATA; 119295626Sandrew sc->reg_slave_addr = TWI_ADDR; 120295626Sandrew sc->reg_slave_ext_addr = TWI_XADDR; 121295626Sandrew sc->reg_control = TWI_CNTR; 122295626Sandrew sc->reg_status = TWI_STAT; 123295626Sandrew sc->reg_baud_rate = TWI_CCR; 124295626Sandrew sc->reg_soft_reset = TWI_SRST; 125295626Sandrew 126295626Sandrew /* Setup baud rate params */ 127295626Sandrew sc->baud_rate[IIC_SLOW].param = TWSI_BAUD_RATE_PARAM(11, 2); 128295626Sandrew sc->baud_rate[IIC_FAST].param = TWSI_BAUD_RATE_PARAM(11, 2); 129295626Sandrew sc->baud_rate[IIC_FASTEST].param = TWSI_BAUD_RATE_PARAM(2, 2); 130295626Sandrew 131295626Sandrew return (twsi_attach(dev)); 132295626Sandrew} 133295626Sandrew 134295626Sandrewstatic phandle_t 135295626Sandrewa10_twsi_get_node(device_t bus, device_t dev) 136295626Sandrew{ 137295626Sandrew return (ofw_bus_get_node(bus)); 138295626Sandrew} 139295626Sandrew 140295626Sandrewstatic device_method_t a10_twsi_methods[] = { 141295626Sandrew /* device interface */ 142295626Sandrew DEVMETHOD(device_probe, a10_twsi_probe), 143295626Sandrew DEVMETHOD(device_attach, a10_twsi_attach), 144295626Sandrew 145295626Sandrew /* OFW methods */ 146295626Sandrew DEVMETHOD(ofw_bus_get_node, a10_twsi_get_node), 147295626Sandrew 148295626Sandrew { 0, 0 } 149295626Sandrew}; 150295626Sandrew 151295626SandrewDEFINE_CLASS_1(iichb, a10_twsi_driver, a10_twsi_methods, 152295626Sandrew sizeof(struct twsi_softc), twsi_driver); 153295626Sandrew 154295626Sandrewstatic devclass_t a10_twsi_devclass; 155295626Sandrew 156300777SmanuEARLY_DRIVER_MODULE(a10_twsi, simplebus, a10_twsi_driver, a10_twsi_devclass, 157300777Smanu 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE); 158300777SmanuEARLY_DRIVER_MODULE(iicbus, a10_twsi, iicbus_driver, iicbus_devclass, 159300777Smanu 0, 0, BUS_PASS_BUS + BUS_PASS_ORDER_MIDDLE); 160295626SandrewMODULE_DEPEND(a10_twsi, iicbus, 1, 1, 1); 161