1 /*- 2 * Copyright (c) 2017-2018 QCM Technologies. 3 * Copyright (c) 2017-2018 Semihalf. 4 * All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include "opt_platform.h" 29 30 #include <sys/param.h> 31 #include <sys/endian.h> 32 #include <sys/systm.h> 33 #include <sys/bus.h> 34 #include <sys/conf.h> 35 #include <sys/kernel.h> 36 #include <sys/lock.h> 37 #include <sys/mbuf.h> 38 #include <sys/malloc.h> 39 #include <sys/module.h> 40 #include <sys/mutex.h> 41 #include <sys/rman.h> 42 #include <machine/bus.h> 43 44 #include <vm/vm.h> 45 #include <vm/pmap.h> 46 47 #include <dev/iicbus/iiconf.h> 48 #include <dev/iicbus/iicbus.h> 49 #include "iicbus_if.h" 50 51 #include "opal.h" 52 53 #ifdef FDT 54 #include <dev/ofw/ofw_bus.h> 55 #include <dev/ofw/ofw_bus_subr.h> 56 #endif 57 58 struct opal_i2c_softc 59 { 60 device_t dev; 61 device_t iicbus; 62 uint32_t opal_id; 63 struct mtx sc_mtx; 64 }; 65 66 /* OPAL I2C request */ 67 struct opal_i2c_request { 68 uint8_t type; 69 #define OPAL_I2C_RAW_READ 0 70 #define OPAL_I2C_RAW_WRITE 1 71 #define OPAL_I2C_SM_READ 2 72 #define OPAL_I2C_SM_WRITE 3 73 uint8_t flags; 74 uint8_t subaddr_sz; /* Max 4 */ 75 uint8_t reserved; 76 uint16_t addr; /* 7 or 10 bit address */ 77 uint16_t reserved2; 78 uint32_t subaddr; /* Sub-address if any */ 79 uint32_t size; /* Data size */ 80 uint64_t buffer_pa; /* Buffer real address */ 81 }; 82 83 static int opal_i2c_attach(device_t); 84 static int opal_i2c_callback(device_t, int, caddr_t); 85 static int opal_i2c_probe(device_t); 86 static int opal_i2c_transfer(device_t, struct iic_msg *, uint32_t); 87 static int i2c_opal_send_request(uint32_t, struct opal_i2c_request *); 88 static phandle_t opal_i2c_get_node(device_t bus, device_t dev); 89 90 static device_method_t opal_i2c_methods[] = { 91 /* Device interface */ 92 DEVMETHOD(device_probe, opal_i2c_probe), 93 DEVMETHOD(device_attach, opal_i2c_attach), 94 95 /* iicbus interface */ 96 DEVMETHOD(iicbus_callback, opal_i2c_callback), 97 DEVMETHOD(iicbus_transfer, opal_i2c_transfer), 98 DEVMETHOD(ofw_bus_get_node, opal_i2c_get_node), 99 DEVMETHOD_END 100 }; 101 102 #define I2C_LOCK(_sc) mtx_lock(&(_sc)->sc_mtx) 103 #define I2C_UNLOCK(_sc) mtx_unlock(&(_sc)->sc_mtx) 104 #define I2C_LOCK_INIT(_sc) \ 105 mtx_init(&_sc->sc_mtx, device_get_nameunit(_sc->dev), \ 106 "i2c", MTX_DEF) 107 108 static driver_t opal_i2c_driver = { 109 "iichb", 110 opal_i2c_methods, 111 sizeof(struct opal_i2c_softc), 112 }; 113 114 static int 115 opal_i2c_probe(device_t dev) 116 { 117 118 if (!(ofw_bus_is_compatible(dev, "ibm,opal-i2c"))) 119 return (ENXIO); 120 121 device_set_desc(dev, "opal-i2c"); 122 123 return (0); 124 } 125 126 static int 127 opal_i2c_attach(device_t dev) 128 { 129 struct opal_i2c_softc *sc; 130 int len; 131 132 sc = device_get_softc(dev); 133 sc->dev = dev; 134 135 len = OF_getproplen(ofw_bus_get_node(dev), "ibm,opal-id"); 136 if (len <= 0) 137 return (EINVAL); 138 OF_getencprop(ofw_bus_get_node(dev), "ibm,opal-id", &sc->opal_id, len); 139 140 if ((sc->iicbus = device_add_child(dev, "iicbus", -1)) == NULL) { 141 device_printf(dev, "could not allocate iicbus instance\n"); 142 return (EINVAL); 143 } 144 145 I2C_LOCK_INIT(sc); 146 147 bus_attach_children(dev); 148 return (0); 149 } 150 151 static int 152 opal_get_async_rc(struct opal_msg msg) 153 { 154 if (msg.msg_type != OPAL_MSG_ASYNC_COMP) 155 return OPAL_PARAMETER; 156 else 157 return htobe64(msg.params[1]); 158 } 159 160 static int 161 i2c_opal_send_request(uint32_t bus_id, struct opal_i2c_request *req) 162 { 163 struct opal_msg msg; 164 uint64_t token; 165 int rc; 166 167 token = opal_alloc_async_token(); 168 169 memset(&msg, 0, sizeof(msg)); 170 171 rc = opal_call(OPAL_I2C_REQUEST, token, bus_id, 172 vtophys(req)); 173 if (rc != OPAL_ASYNC_COMPLETION) 174 goto out; 175 176 rc = opal_wait_completion(&msg, sizeof(msg), token); 177 178 if (rc != OPAL_SUCCESS) 179 goto out; 180 181 rc = opal_get_async_rc(msg); 182 183 out: 184 opal_free_async_token(token); 185 186 return (rc); 187 } 188 189 static int 190 opal_i2c_transfer(device_t dev, struct iic_msg *msgs, uint32_t nmsgs) 191 { 192 struct opal_i2c_softc *sc; 193 int i, err = 0; 194 struct opal_i2c_request req; 195 196 sc = device_get_softc(dev); 197 198 memset(&req, 0, sizeof(req)); 199 200 I2C_LOCK(sc); 201 for (i = 0; i < nmsgs; i++) { 202 req.type = (msgs[i].flags & IIC_M_RD) ? 203 OPAL_I2C_RAW_READ : OPAL_I2C_RAW_WRITE; 204 req.addr = htobe16(msgs[i].slave >> 1); 205 req.size = htobe32(msgs[i].len); 206 req.buffer_pa = htobe64(pmap_kextract((uint64_t)msgs[i].buf)); 207 208 err = i2c_opal_send_request(sc->opal_id, &req); 209 } 210 I2C_UNLOCK(sc); 211 212 return (err); 213 } 214 215 static int 216 opal_i2c_callback(device_t dev, int index, caddr_t data) 217 { 218 int error = 0; 219 220 switch (index) { 221 case IIC_REQUEST_BUS: 222 break; 223 224 case IIC_RELEASE_BUS: 225 break; 226 227 default: 228 error = EINVAL; 229 } 230 231 return (error); 232 } 233 234 static phandle_t 235 opal_i2c_get_node(device_t bus, device_t dev) 236 { 237 238 /* Share controller node with iibus device. */ 239 return (ofw_bus_get_node(bus)); 240 } 241 242 DRIVER_MODULE(opal_i2c, opal_i2cm, opal_i2c_driver, NULL, NULL); 243 DRIVER_MODULE(iicbus, opal_i2c, iicbus_driver, NULL, NULL); 244 MODULE_DEPEND(opal_i2c, iicbus, 1, 1, 1); 245