12aa5eac5SBen Skeggs /*
22aa5eac5SBen Skeggs * Copyright 2015 Red Hat Inc.
32aa5eac5SBen Skeggs *
42aa5eac5SBen Skeggs * Permission is hereby granted, free of charge, to any person obtaining a
52aa5eac5SBen Skeggs * copy of this software and associated documentation files (the "Software"),
62aa5eac5SBen Skeggs * to deal in the Software without restriction, including without limitation
72aa5eac5SBen Skeggs * the rights to use, copy, modify, merge, publish, distribute, sublicense,
82aa5eac5SBen Skeggs * and/or sell copies of the Software, and to permit persons to whom the
92aa5eac5SBen Skeggs * Software is furnished to do so, subject to the following conditions:
102aa5eac5SBen Skeggs *
112aa5eac5SBen Skeggs * The above copyright notice and this permission notice shall be included in
122aa5eac5SBen Skeggs * all copies or substantial portions of the Software.
132aa5eac5SBen Skeggs *
142aa5eac5SBen Skeggs * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
152aa5eac5SBen Skeggs * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
162aa5eac5SBen Skeggs * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
172aa5eac5SBen Skeggs * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
182aa5eac5SBen Skeggs * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
192aa5eac5SBen Skeggs * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
202aa5eac5SBen Skeggs * OTHER DEALINGS IN THE SOFTWARE.
212aa5eac5SBen Skeggs *
222aa5eac5SBen Skeggs * Authors: Ben Skeggs <bskeggs@redhat.com>
232aa5eac5SBen Skeggs */
242aa5eac5SBen Skeggs #include "bus.h"
252aa5eac5SBen Skeggs #include "pad.h"
262aa5eac5SBen Skeggs
272aa5eac5SBen Skeggs #include <core/option.h>
282aa5eac5SBen Skeggs
292aa5eac5SBen Skeggs /*******************************************************************************
302aa5eac5SBen Skeggs * i2c-algo-bit
312aa5eac5SBen Skeggs ******************************************************************************/
322aa5eac5SBen Skeggs static int
nvkm_i2c_bus_pre_xfer(struct i2c_adapter * adap)332aa5eac5SBen Skeggs nvkm_i2c_bus_pre_xfer(struct i2c_adapter *adap)
342aa5eac5SBen Skeggs {
352aa5eac5SBen Skeggs struct nvkm_i2c_bus *bus = container_of(adap, typeof(*bus), i2c);
362aa5eac5SBen Skeggs return nvkm_i2c_bus_acquire(bus);
372aa5eac5SBen Skeggs }
382aa5eac5SBen Skeggs
392aa5eac5SBen Skeggs static void
nvkm_i2c_bus_post_xfer(struct i2c_adapter * adap)402aa5eac5SBen Skeggs nvkm_i2c_bus_post_xfer(struct i2c_adapter *adap)
412aa5eac5SBen Skeggs {
422aa5eac5SBen Skeggs struct nvkm_i2c_bus *bus = container_of(adap, typeof(*bus), i2c);
432aa5eac5SBen Skeggs return nvkm_i2c_bus_release(bus);
442aa5eac5SBen Skeggs }
452aa5eac5SBen Skeggs
462aa5eac5SBen Skeggs static void
nvkm_i2c_bus_setscl(void * data,int state)472aa5eac5SBen Skeggs nvkm_i2c_bus_setscl(void *data, int state)
482aa5eac5SBen Skeggs {
492aa5eac5SBen Skeggs struct nvkm_i2c_bus *bus = data;
502aa5eac5SBen Skeggs bus->func->drive_scl(bus, state);
512aa5eac5SBen Skeggs }
522aa5eac5SBen Skeggs
532aa5eac5SBen Skeggs static void
nvkm_i2c_bus_setsda(void * data,int state)542aa5eac5SBen Skeggs nvkm_i2c_bus_setsda(void *data, int state)
552aa5eac5SBen Skeggs {
562aa5eac5SBen Skeggs struct nvkm_i2c_bus *bus = data;
572aa5eac5SBen Skeggs bus->func->drive_sda(bus, state);
582aa5eac5SBen Skeggs }
592aa5eac5SBen Skeggs
602aa5eac5SBen Skeggs static int
nvkm_i2c_bus_getscl(void * data)612aa5eac5SBen Skeggs nvkm_i2c_bus_getscl(void *data)
622aa5eac5SBen Skeggs {
632aa5eac5SBen Skeggs struct nvkm_i2c_bus *bus = data;
642aa5eac5SBen Skeggs return bus->func->sense_scl(bus);
652aa5eac5SBen Skeggs }
662aa5eac5SBen Skeggs
672aa5eac5SBen Skeggs static int
nvkm_i2c_bus_getsda(void * data)682aa5eac5SBen Skeggs nvkm_i2c_bus_getsda(void *data)
692aa5eac5SBen Skeggs {
702aa5eac5SBen Skeggs struct nvkm_i2c_bus *bus = data;
712aa5eac5SBen Skeggs return bus->func->sense_sda(bus);
722aa5eac5SBen Skeggs }
732aa5eac5SBen Skeggs
742aa5eac5SBen Skeggs /*******************************************************************************
752aa5eac5SBen Skeggs * !i2c-algo-bit (off-chip i2c bus / hw i2c / internal bit-banging algo)
762aa5eac5SBen Skeggs ******************************************************************************/
772aa5eac5SBen Skeggs static int
nvkm_i2c_bus_xfer(struct i2c_adapter * adap,struct i2c_msg * msgs,int num)782aa5eac5SBen Skeggs nvkm_i2c_bus_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
792aa5eac5SBen Skeggs {
802aa5eac5SBen Skeggs struct nvkm_i2c_bus *bus = container_of(adap, typeof(*bus), i2c);
812aa5eac5SBen Skeggs int ret;
822aa5eac5SBen Skeggs
832aa5eac5SBen Skeggs ret = nvkm_i2c_bus_acquire(bus);
842aa5eac5SBen Skeggs if (ret)
852aa5eac5SBen Skeggs return ret;
862aa5eac5SBen Skeggs
872aa5eac5SBen Skeggs ret = bus->func->xfer(bus, msgs, num);
882aa5eac5SBen Skeggs nvkm_i2c_bus_release(bus);
892aa5eac5SBen Skeggs return ret;
902aa5eac5SBen Skeggs }
912aa5eac5SBen Skeggs
922aa5eac5SBen Skeggs static u32
nvkm_i2c_bus_func(struct i2c_adapter * adap)932aa5eac5SBen Skeggs nvkm_i2c_bus_func(struct i2c_adapter *adap)
942aa5eac5SBen Skeggs {
952aa5eac5SBen Skeggs return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
962aa5eac5SBen Skeggs }
972aa5eac5SBen Skeggs
982aa5eac5SBen Skeggs static const struct i2c_algorithm
992aa5eac5SBen Skeggs nvkm_i2c_bus_algo = {
1002aa5eac5SBen Skeggs .master_xfer = nvkm_i2c_bus_xfer,
1012aa5eac5SBen Skeggs .functionality = nvkm_i2c_bus_func,
1022aa5eac5SBen Skeggs };
1032aa5eac5SBen Skeggs
1042aa5eac5SBen Skeggs /*******************************************************************************
1052aa5eac5SBen Skeggs * nvkm_i2c_bus base
1062aa5eac5SBen Skeggs ******************************************************************************/
1072aa5eac5SBen Skeggs void
nvkm_i2c_bus_init(struct nvkm_i2c_bus * bus)1082aa5eac5SBen Skeggs nvkm_i2c_bus_init(struct nvkm_i2c_bus *bus)
1092aa5eac5SBen Skeggs {
1102aa5eac5SBen Skeggs BUS_TRACE(bus, "init");
1112aa5eac5SBen Skeggs if (bus->func->init)
1122aa5eac5SBen Skeggs bus->func->init(bus);
113*342406e4SLyude Paul
114*342406e4SLyude Paul mutex_lock(&bus->mutex);
115*342406e4SLyude Paul bus->enabled = true;
116*342406e4SLyude Paul mutex_unlock(&bus->mutex);
117*342406e4SLyude Paul }
118*342406e4SLyude Paul
119*342406e4SLyude Paul void
nvkm_i2c_bus_fini(struct nvkm_i2c_bus * bus)120*342406e4SLyude Paul nvkm_i2c_bus_fini(struct nvkm_i2c_bus *bus)
121*342406e4SLyude Paul {
122*342406e4SLyude Paul BUS_TRACE(bus, "fini");
123*342406e4SLyude Paul mutex_lock(&bus->mutex);
124*342406e4SLyude Paul bus->enabled = false;
125*342406e4SLyude Paul mutex_unlock(&bus->mutex);
1262aa5eac5SBen Skeggs }
1272aa5eac5SBen Skeggs
1282aa5eac5SBen Skeggs void
nvkm_i2c_bus_release(struct nvkm_i2c_bus * bus)1292aa5eac5SBen Skeggs nvkm_i2c_bus_release(struct nvkm_i2c_bus *bus)
1302aa5eac5SBen Skeggs {
1312aa5eac5SBen Skeggs struct nvkm_i2c_pad *pad = bus->pad;
1322aa5eac5SBen Skeggs BUS_TRACE(bus, "release");
1332aa5eac5SBen Skeggs nvkm_i2c_pad_release(pad);
1342aa5eac5SBen Skeggs mutex_unlock(&bus->mutex);
1352aa5eac5SBen Skeggs }
1362aa5eac5SBen Skeggs
1372aa5eac5SBen Skeggs int
nvkm_i2c_bus_acquire(struct nvkm_i2c_bus * bus)1382aa5eac5SBen Skeggs nvkm_i2c_bus_acquire(struct nvkm_i2c_bus *bus)
1392aa5eac5SBen Skeggs {
1402aa5eac5SBen Skeggs struct nvkm_i2c_pad *pad = bus->pad;
1412aa5eac5SBen Skeggs int ret;
142*342406e4SLyude Paul
1432aa5eac5SBen Skeggs BUS_TRACE(bus, "acquire");
1442aa5eac5SBen Skeggs mutex_lock(&bus->mutex);
145*342406e4SLyude Paul
146*342406e4SLyude Paul if (bus->enabled)
1472aa5eac5SBen Skeggs ret = nvkm_i2c_pad_acquire(pad, NVKM_I2C_PAD_I2C);
148*342406e4SLyude Paul else
149*342406e4SLyude Paul ret = -EIO;
150*342406e4SLyude Paul
1512aa5eac5SBen Skeggs if (ret)
1522aa5eac5SBen Skeggs mutex_unlock(&bus->mutex);
1532aa5eac5SBen Skeggs return ret;
1542aa5eac5SBen Skeggs }
1552aa5eac5SBen Skeggs
1562aa5eac5SBen Skeggs int
nvkm_i2c_bus_probe(struct nvkm_i2c_bus * bus,const char * what,struct nvkm_i2c_bus_probe * info,bool (* match)(struct nvkm_i2c_bus *,struct i2c_board_info *,void *),void * data)1572aa5eac5SBen Skeggs nvkm_i2c_bus_probe(struct nvkm_i2c_bus *bus, const char *what,
1582aa5eac5SBen Skeggs struct nvkm_i2c_bus_probe *info,
1592aa5eac5SBen Skeggs bool (*match)(struct nvkm_i2c_bus *,
1602aa5eac5SBen Skeggs struct i2c_board_info *, void *), void *data)
1612aa5eac5SBen Skeggs {
1622aa5eac5SBen Skeggs int i;
1632aa5eac5SBen Skeggs
1642aa5eac5SBen Skeggs BUS_DBG(bus, "probing %ss", what);
1652aa5eac5SBen Skeggs for (i = 0; info[i].dev.addr; i++) {
1662aa5eac5SBen Skeggs u8 orig_udelay = 0;
1672aa5eac5SBen Skeggs
1682aa5eac5SBen Skeggs if ((bus->i2c.algo == &i2c_bit_algo) && (info[i].udelay != 0)) {
1692aa5eac5SBen Skeggs struct i2c_algo_bit_data *algo = bus->i2c.algo_data;
1702aa5eac5SBen Skeggs BUS_DBG(bus, "%dms delay instead of %dms",
1712aa5eac5SBen Skeggs info[i].udelay, algo->udelay);
1722aa5eac5SBen Skeggs orig_udelay = algo->udelay;
1732aa5eac5SBen Skeggs algo->udelay = info[i].udelay;
1742aa5eac5SBen Skeggs }
1752aa5eac5SBen Skeggs
1762aa5eac5SBen Skeggs if (nvkm_probe_i2c(&bus->i2c, info[i].dev.addr) &&
1772aa5eac5SBen Skeggs (!match || match(bus, &info[i].dev, data))) {
1782aa5eac5SBen Skeggs BUS_DBG(bus, "detected %s: %s",
1792aa5eac5SBen Skeggs what, info[i].dev.type);
1802aa5eac5SBen Skeggs return i;
1812aa5eac5SBen Skeggs }
1822aa5eac5SBen Skeggs
1832aa5eac5SBen Skeggs if (orig_udelay) {
1842aa5eac5SBen Skeggs struct i2c_algo_bit_data *algo = bus->i2c.algo_data;
1852aa5eac5SBen Skeggs algo->udelay = orig_udelay;
1862aa5eac5SBen Skeggs }
1872aa5eac5SBen Skeggs }
1882aa5eac5SBen Skeggs
1892aa5eac5SBen Skeggs BUS_DBG(bus, "no devices found.");
1902aa5eac5SBen Skeggs return -ENODEV;
1912aa5eac5SBen Skeggs }
1922aa5eac5SBen Skeggs
1932aa5eac5SBen Skeggs void
nvkm_i2c_bus_del(struct nvkm_i2c_bus ** pbus)1942aa5eac5SBen Skeggs nvkm_i2c_bus_del(struct nvkm_i2c_bus **pbus)
1952aa5eac5SBen Skeggs {
1962aa5eac5SBen Skeggs struct nvkm_i2c_bus *bus = *pbus;
1972aa5eac5SBen Skeggs if (bus && !WARN_ON(!bus->func)) {
1982aa5eac5SBen Skeggs BUS_TRACE(bus, "dtor");
1992aa5eac5SBen Skeggs list_del(&bus->head);
2002aa5eac5SBen Skeggs i2c_del_adapter(&bus->i2c);
2012aa5eac5SBen Skeggs kfree(bus->i2c.algo_data);
2022aa5eac5SBen Skeggs kfree(*pbus);
2032aa5eac5SBen Skeggs *pbus = NULL;
2042aa5eac5SBen Skeggs }
2052aa5eac5SBen Skeggs }
2062aa5eac5SBen Skeggs
2072aa5eac5SBen Skeggs int
nvkm_i2c_bus_ctor(const struct nvkm_i2c_bus_func * func,struct nvkm_i2c_pad * pad,int id,struct nvkm_i2c_bus * bus)2082aa5eac5SBen Skeggs nvkm_i2c_bus_ctor(const struct nvkm_i2c_bus_func *func,
2092aa5eac5SBen Skeggs struct nvkm_i2c_pad *pad, int id,
2102aa5eac5SBen Skeggs struct nvkm_i2c_bus *bus)
2112aa5eac5SBen Skeggs {
2122aa5eac5SBen Skeggs struct nvkm_device *device = pad->i2c->subdev.device;
2132aa5eac5SBen Skeggs struct i2c_algo_bit_data *bit;
2142aa5eac5SBen Skeggs #ifndef CONFIG_NOUVEAU_I2C_INTERNAL_DEFAULT
2152aa5eac5SBen Skeggs const bool internal = false;
2162aa5eac5SBen Skeggs #else
2172aa5eac5SBen Skeggs const bool internal = true;
2182aa5eac5SBen Skeggs #endif
2192aa5eac5SBen Skeggs int ret;
2202aa5eac5SBen Skeggs
2212aa5eac5SBen Skeggs bus->func = func;
2222aa5eac5SBen Skeggs bus->pad = pad;
2232aa5eac5SBen Skeggs bus->id = id;
2242aa5eac5SBen Skeggs mutex_init(&bus->mutex);
2252aa5eac5SBen Skeggs list_add_tail(&bus->head, &pad->i2c->bus);
2262aa5eac5SBen Skeggs BUS_TRACE(bus, "ctor");
2272aa5eac5SBen Skeggs
2282aa5eac5SBen Skeggs snprintf(bus->i2c.name, sizeof(bus->i2c.name), "nvkm-%s-bus-%04x",
2292aa5eac5SBen Skeggs dev_name(device->dev), id);
2302aa5eac5SBen Skeggs bus->i2c.owner = THIS_MODULE;
2312aa5eac5SBen Skeggs bus->i2c.dev.parent = device->dev;
2322aa5eac5SBen Skeggs
2332aa5eac5SBen Skeggs if ( bus->func->drive_scl &&
2342aa5eac5SBen Skeggs !nvkm_boolopt(device->cfgopt, "NvI2C", internal)) {
2352aa5eac5SBen Skeggs if (!(bit = kzalloc(sizeof(*bit), GFP_KERNEL)))
2362aa5eac5SBen Skeggs return -ENOMEM;
2372aa5eac5SBen Skeggs bit->udelay = 10;
2382aa5eac5SBen Skeggs bit->timeout = usecs_to_jiffies(2200);
2392aa5eac5SBen Skeggs bit->data = bus;
2402aa5eac5SBen Skeggs bit->pre_xfer = nvkm_i2c_bus_pre_xfer;
2412aa5eac5SBen Skeggs bit->post_xfer = nvkm_i2c_bus_post_xfer;
2422aa5eac5SBen Skeggs bit->setscl = nvkm_i2c_bus_setscl;
2432aa5eac5SBen Skeggs bit->setsda = nvkm_i2c_bus_setsda;
2442aa5eac5SBen Skeggs bit->getscl = nvkm_i2c_bus_getscl;
2452aa5eac5SBen Skeggs bit->getsda = nvkm_i2c_bus_getsda;
2462aa5eac5SBen Skeggs bus->i2c.algo_data = bit;
2472aa5eac5SBen Skeggs ret = i2c_bit_add_bus(&bus->i2c);
2482aa5eac5SBen Skeggs } else {
2492aa5eac5SBen Skeggs bus->i2c.algo = &nvkm_i2c_bus_algo;
2502aa5eac5SBen Skeggs ret = i2c_add_adapter(&bus->i2c);
2512aa5eac5SBen Skeggs }
2522aa5eac5SBen Skeggs
2532aa5eac5SBen Skeggs return ret;
2542aa5eac5SBen Skeggs }
2552aa5eac5SBen Skeggs
2562aa5eac5SBen Skeggs int
nvkm_i2c_bus_new_(const struct nvkm_i2c_bus_func * func,struct nvkm_i2c_pad * pad,int id,struct nvkm_i2c_bus ** pbus)2572aa5eac5SBen Skeggs nvkm_i2c_bus_new_(const struct nvkm_i2c_bus_func *func,
2582aa5eac5SBen Skeggs struct nvkm_i2c_pad *pad, int id,
2592aa5eac5SBen Skeggs struct nvkm_i2c_bus **pbus)
2602aa5eac5SBen Skeggs {
2612aa5eac5SBen Skeggs if (!(*pbus = kzalloc(sizeof(**pbus), GFP_KERNEL)))
2622aa5eac5SBen Skeggs return -ENOMEM;
2632aa5eac5SBen Skeggs return nvkm_i2c_bus_ctor(func, pad, id, *pbus);
2642aa5eac5SBen Skeggs }
265