1/*- 2 * Copyright (c) 2016-2019 Emmanuel Vadot <manu@freebsd.org> 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 */ 25 26#include <sys/cdefs.h> 27__FBSDID("$FreeBSD$"); 28 29#include <sys/param.h> 30#include <sys/systm.h> 31#include <sys/bus.h> 32#include <sys/kernel.h> 33#include <sys/module.h> 34#include <sys/resource.h> 35 36#include <machine/bus.h> 37#include <machine/resource.h> 38 39#include <sys/rman.h> 40 41#include <sys/lock.h> 42#include <sys/mutex.h> 43 44#include <dev/iicbus/iiconf.h> 45#include <dev/iicbus/iicbus.h> 46#include <dev/iicbus/twsi/twsi.h> 47#include <dev/ofw/ofw_bus.h> 48#include <dev/ofw/ofw_bus_subr.h> 49 50#include <dev/extres/clk/clk.h> 51#include <dev/extres/hwreset/hwreset.h> 52 53#include "iicbus_if.h" 54 55#define TWI_ADDR 0x0 56#define TWI_XADDR 0x4 57#define TWI_DATA 0x8 58#define TWI_CNTR 0xC 59#define TWI_STAT 0x10 60#define TWI_CCR 0x14 61#define TWI_SRST 0x18 62#define TWI_EFR 0x1C 63#define TWI_LCR 0x20 64 65static struct ofw_compat_data compat_data[] = { 66 {"allwinner,sun4i-a10-i2c", 1}, 67 {"allwinner,sun6i-a31-i2c", 1}, 68 {"allwinner,sun8i-a83t-i2c", 1}, 69 {NULL, 0}, 70}; 71 72static int 73a10_twsi_probe(device_t dev) 74{ 75 76 if (!ofw_bus_status_okay(dev)) 77 return (ENXIO); 78 79 if (ofw_bus_search_compatible(dev, compat_data)->ocd_data == 0) 80 return (ENXIO); 81 82 device_set_desc(dev, "Allwinner Integrated I2C Bus Controller"); 83 return (BUS_PROBE_DEFAULT); 84} 85 86static int 87a10_twsi_attach(device_t dev) 88{ 89 struct twsi_softc *sc; 90 hwreset_t rst; 91 int error; 92 93 sc = device_get_softc(dev); 94 95 /* De-assert reset */ 96 if (hwreset_get_by_ofw_idx(dev, 0, 0, &rst) == 0) { 97 error = hwreset_deassert(rst); 98 if (error != 0) { 99 device_printf(dev, "could not de-assert reset\n"); 100 return (error); 101 } 102 } 103 104 /* Activate clock */ 105 error = clk_get_by_ofw_index(dev, 0, 0, &sc->clk_core); 106 if (error != 0) { 107 device_printf(dev, "could not find clock\n"); 108 return (error); 109 } 110 error = clk_enable(sc->clk_core); 111 if (error != 0) { 112 device_printf(dev, "could not enable clock\n"); 113 return (error); 114 } 115 116 sc->reg_data = TWI_DATA; 117 sc->reg_slave_addr = TWI_ADDR; 118 sc->reg_slave_ext_addr = TWI_XADDR; 119 sc->reg_control = TWI_CNTR; 120 sc->reg_status = TWI_STAT; 121 sc->reg_baud_rate = TWI_CCR; 122 sc->reg_soft_reset = TWI_SRST; 123 124 sc->need_ack = true; 125 126 if (ofw_bus_is_compatible(dev, "allwinner,sun6i-a31-i2c") || 127 ofw_bus_is_compatible(dev, "allwinner,sun6i-a83t-i2c")) 128 sc->iflag_w1c = true; 129 return (twsi_attach(dev)); 130} 131 132static phandle_t 133a10_twsi_get_node(device_t bus, device_t dev) 134{ 135 return (ofw_bus_get_node(bus)); 136} 137 138static device_method_t a10_twsi_methods[] = { 139 /* device interface */ 140 DEVMETHOD(device_probe, a10_twsi_probe), 141 DEVMETHOD(device_attach, a10_twsi_attach), 142 143 /* OFW methods */ 144 DEVMETHOD(ofw_bus_get_node, a10_twsi_get_node), 145 146 { 0, 0 } 147}; 148 149DEFINE_CLASS_1(iichb, a10_twsi_driver, a10_twsi_methods, 150 sizeof(struct twsi_softc), twsi_driver); 151 152static devclass_t a10_twsi_devclass; 153 154EARLY_DRIVER_MODULE(a10_twsi, simplebus, a10_twsi_driver, a10_twsi_devclass, 155 0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LATE); 156EARLY_DRIVER_MODULE(iicbus, a10_twsi, iicbus_driver, iicbus_devclass, 157 0, 0, BUS_PASS_INTERRUPT + BUS_PASS_ORDER_LATE); 158MODULE_DEPEND(a10_twsi, iicbus, 1, 1, 1); 159SIMPLEBUS_PNP_INFO(compat_data); 160