/* * Copyright 2013 Red Hat Inc. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * Authors: Ben Skeggs */ #include "priv.h" #include "pad.h" #include #include #include #include /****************************************************************************** * interface to linux i2c bit-banging algorithm *****************************************************************************/ #ifdef CONFIG_NOUVEAU_I2C_INTERNAL_DEFAULT #define CSTMSEL true #else #define CSTMSEL false #endif static int nvkm_i2c_pre_xfer(struct i2c_adapter *adap) { struct i2c_algo_bit_data *bit = adap->algo_data; struct nvkm_i2c_port *port = bit->data; return nvkm_i2c(port)->acquire(port, bit->timeout); } static void nvkm_i2c_post_xfer(struct i2c_adapter *adap) { struct i2c_algo_bit_data *bit = adap->algo_data; struct nvkm_i2c_port *port = bit->data; return nvkm_i2c(port)->release(port); } static void nvkm_i2c_setscl(void *data, int state) { struct nvkm_i2c_port *port = data; port->func->drive_scl(port, state); } static void nvkm_i2c_setsda(void *data, int state) { struct nvkm_i2c_port *port = data; port->func->drive_sda(port, state); } static int nvkm_i2c_getscl(void *data) { struct nvkm_i2c_port *port = data; return port->func->sense_scl(port); } static int nvkm_i2c_getsda(void *data) { struct nvkm_i2c_port *port = data; return port->func->sense_sda(port); } /****************************************************************************** * base i2c "port" class implementation *****************************************************************************/ int _nvkm_i2c_port_fini(struct nvkm_object *object, bool suspend) { struct nvkm_i2c_port *port = (void *)object; struct nvkm_i2c_pad *pad = nvkm_i2c_pad(port); nv_ofuncs(pad)->fini(nv_object(pad), suspend); return nvkm_object_fini(&port->base, suspend); } void _nvkm_i2c_port_dtor(struct nvkm_object *object) { struct nvkm_i2c_port *port = (void *)object; i2c_del_adapter(&port->adapter); nvkm_object_destroy(&port->base); } int nvkm_i2c_port_create_(struct nvkm_object *parent, struct nvkm_object *engine, struct nvkm_oclass *oclass, u8 index, const struct i2c_algorithm *algo, const struct nvkm_i2c_func *func, int size, void **pobject) { struct nvkm_device *device = nv_device(parent); struct nvkm_i2c *i2c = nvkm_i2c(parent); struct nvkm_i2c_port *port; int ret; ret = nvkm_object_create_(parent, engine, oclass, 0, size, pobject); port = *pobject; if (ret) return ret; snprintf(port->adapter.name, sizeof(port->adapter.name), "nvkm-%s-%d", device->name, index); port->adapter.owner = THIS_MODULE; port->adapter.dev.parent = nv_device_base(device); port->index = index; port->aux = -1; port->func = func; mutex_init(&port->mutex); if ( algo == &nvkm_i2c_bit_algo && !nvkm_boolopt(device->cfgopt, "NvI2C", CSTMSEL)) { struct i2c_algo_bit_data *bit; bit = kzalloc(sizeof(*bit), GFP_KERNEL); if (!bit) return -ENOMEM; bit->udelay = 10; bit->timeout = usecs_to_jiffies(2200); bit->data = port; bit->pre_xfer = nvkm_i2c_pre_xfer; bit->post_xfer = nvkm_i2c_post_xfer; bit->setsda = nvkm_i2c_setsda; bit->setscl = nvkm_i2c_setscl; bit->getsda = nvkm_i2c_getsda; bit->getscl = nvkm_i2c_getscl; port->adapter.algo_data = bit; ret = i2c_bit_add_bus(&port->adapter); } else { port->adapter.algo_data = port; port->adapter.algo = algo; ret = i2c_add_adapter(&port->adapter); } if (ret == 0) list_add_tail(&port->head, &i2c->ports); return ret; } /****************************************************************************** * base i2c subdev class implementation *****************************************************************************/ static struct nvkm_i2c_port * nvkm_i2c_find(struct nvkm_i2c *i2c, u8 index) { struct nvkm_bios *bios = nvkm_bios(i2c); struct nvkm_i2c_port *port; if (index == NV_I2C_DEFAULT(0) || index == NV_I2C_DEFAULT(1)) { u8 ver, hdr, cnt, len; u16 i2c = dcb_i2c_table(bios, &ver, &hdr, &cnt, &len); if (i2c && ver >= 0x30) { u8 auxidx = nv_ro08(bios, i2c + 4); if (index == NV_I2C_DEFAULT(0)) index = (auxidx & 0x0f) >> 0; else index = (auxidx & 0xf0) >> 4; } else { index = 2; } } list_for_each_entry(port, &i2c->ports, head) { if (port->index == index) return port; } return NULL; } static struct nvkm_i2c_port * nvkm_i2c_find_type(struct nvkm_i2c *i2c, u16 type) { struct nvkm_i2c_port *port; list_for_each_entry(port, &i2c->ports, head) { if (nv_hclass(port) == type) return port; } return NULL; } static void nvkm_i2c_release_pad(struct nvkm_i2c_port *port) { struct nvkm_i2c_pad *pad = nvkm_i2c_pad(port); struct nvkm_i2c *i2c = nvkm_i2c(port); if (atomic_dec_and_test(&nv_object(pad)->usecount)) { nv_ofuncs(pad)->fini(nv_object(pad), false); wake_up_all(&i2c->wait); } } static int nvkm_i2c_try_acquire_pad(struct nvkm_i2c_port *port) { struct nvkm_i2c_pad *pad = nvkm_i2c_pad(port); if (atomic_add_return(1, &nv_object(pad)->usecount) != 1) { struct nvkm_object *owner = (void *)pad->port; do { if (owner == (void *)port) return 0; owner = owner->parent; } while(owner); nvkm_i2c_release_pad(port); return -EBUSY; } pad->next = port; nv_ofuncs(pad)->init(nv_object(pad)); return 0; } static int nvkm_i2c_acquire_pad(struct nvkm_i2c_port *port, unsigned long timeout) { struct nvkm_i2c *i2c = nvkm_i2c(port); if (timeout) { if (wait_event_timeout(i2c->wait, nvkm_i2c_try_acquire_pad(port) == 0, timeout) == 0) return -EBUSY; } else { wait_event(i2c->wait, nvkm_i2c_try_acquire_pad(port) == 0); } return 0; } static void nvkm_i2c_release(struct nvkm_i2c_port *port) __releases(pad->mutex) { nvkm_i2c(port)->release_pad(port); mutex_unlock(&port->mutex); } static int nvkm_i2c_acquire(struct nvkm_i2c_port *port, unsigned long timeout) __acquires(pad->mutex) { int ret; mutex_lock(&port->mutex); if ((ret = nvkm_i2c(port)->acquire_pad(port, timeout))) mutex_unlock(&port->mutex); return ret; } static int nvkm_i2c_identify(struct nvkm_i2c *i2c, int index, const char *what, struct nvkm_i2c_board_info *info, bool (*match)(struct nvkm_i2c_port *, struct i2c_board_info *, void *), void *data) { struct nvkm_subdev *subdev = &i2c->subdev; struct nvkm_i2c_port *port = nvkm_i2c_find(i2c, index); int i; if (!port) { nvkm_debug(subdev, "no bus when probing %s on %d\n", what, index); return -ENODEV; } nvkm_debug(subdev, "probing %ss on bus: %d\n", what, port->index); for (i = 0; info[i].dev.addr; i++) { u8 orig_udelay = 0; if ((port->adapter.algo == &i2c_bit_algo) && (info[i].udelay != 0)) { struct i2c_algo_bit_data *algo = port->adapter.algo_data; nvkm_debug(subdev, "using custom udelay %d instead of %d\n", info[i].udelay, algo->udelay); orig_udelay = algo->udelay; algo->udelay = info[i].udelay; } if (nv_probe_i2c(port, info[i].dev.addr) && (!match || match(port, &info[i].dev, data))) { nvkm_info(subdev, "detected %s: %s\n", what, info[i].dev.type); return i; } if (orig_udelay) { struct i2c_algo_bit_data *algo = port->adapter.algo_data; algo->udelay = orig_udelay; } } nvkm_debug(subdev, "no devices found.\n"); return -ENODEV; } static void nvkm_i2c_intr_fini(struct nvkm_event *event, int type, int index) { struct nvkm_i2c *i2c = container_of(event, typeof(*i2c), event); struct nvkm_i2c_port *port = i2c->find(i2c, index); const struct nvkm_i2c_impl *impl = (void *)nv_object(i2c)->oclass; if (port && port->aux >= 0) impl->aux_mask(i2c, type, 1 << port->aux, 0); } static void nvkm_i2c_intr_init(struct nvkm_event *event, int type, int index) { struct nvkm_i2c *i2c = container_of(event, typeof(*i2c), event); struct nvkm_i2c_port *port = i2c->find(i2c, index); const struct nvkm_i2c_impl *impl = (void *)nv_object(i2c)->oclass; if (port && port->aux >= 0) impl->aux_mask(i2c, type, 1 << port->aux, 1 << port->aux); } static int nvkm_i2c_intr_ctor(struct nvkm_object *object, void *data, u32 size, struct nvkm_notify *notify) { struct nvkm_i2c_ntfy_req *req = data; if (!WARN_ON(size != sizeof(*req))) { notify->size = sizeof(struct nvkm_i2c_ntfy_rep); notify->types = req->mask; notify->index = req->port; return 0; } return -EINVAL; } static void nvkm_i2c_intr(struct nvkm_subdev *subdev) { struct nvkm_i2c_impl *impl = (void *)nv_oclass(subdev); struct nvkm_i2c *i2c = nvkm_i2c(subdev); struct nvkm_i2c_port *port; u32 hi, lo, rq, tx, e; if (impl->aux_stat) { impl->aux_stat(i2c, &hi, &lo, &rq, &tx); if (hi || lo || rq || tx) { list_for_each_entry(port, &i2c->ports, head) { if (e = 0, port->aux < 0) continue; if (hi & (1 << port->aux)) e |= NVKM_I2C_PLUG; if (lo & (1 << port->aux)) e |= NVKM_I2C_UNPLUG; if (rq & (1 << port->aux)) e |= NVKM_I2C_IRQ; if (tx & (1 << port->aux)) e |= NVKM_I2C_DONE; if (e) { struct nvkm_i2c_ntfy_rep rep = { .mask = e, }; nvkm_event_send(&i2c->event, rep.mask, port->index, &rep, sizeof(rep)); } } } } } static const struct nvkm_event_func nvkm_i2c_intr_func = { .ctor = nvkm_i2c_intr_ctor, .init = nvkm_i2c_intr_init, .fini = nvkm_i2c_intr_fini, }; int _nvkm_i2c_fini(struct nvkm_object *object, bool suspend) { struct nvkm_i2c_impl *impl = (void *)nv_oclass(object); struct nvkm_i2c *i2c = (void *)object; struct nvkm_i2c_port *port; u32 mask; int ret; list_for_each_entry(port, &i2c->ports, head) { ret = nv_ofuncs(port)->fini(nv_object(port), suspend); if (ret && suspend) goto fail; } if ((mask = (1 << impl->aux) - 1), impl->aux_stat) { impl->aux_mask(i2c, NVKM_I2C_ANY, mask, 0); impl->aux_stat(i2c, &mask, &mask, &mask, &mask); } return nvkm_subdev_fini(&i2c->subdev, suspend); fail: list_for_each_entry_continue_reverse(port, &i2c->ports, head) { nv_ofuncs(port)->init(nv_object(port)); } return ret; } int _nvkm_i2c_init(struct nvkm_object *object) { struct nvkm_i2c *i2c = (void *)object; struct nvkm_i2c_port *port; int ret; ret = nvkm_subdev_init(&i2c->subdev); if (ret == 0) { list_for_each_entry(port, &i2c->ports, head) { ret = nv_ofuncs(port)->init(nv_object(port)); if (ret) goto fail; } } return ret; fail: list_for_each_entry_continue_reverse(port, &i2c->ports, head) { nv_ofuncs(port)->fini(nv_object(port), false); } return ret; } void _nvkm_i2c_dtor(struct nvkm_object *object) { struct nvkm_i2c *i2c = (void *)object; struct nvkm_i2c_port *port, *temp; nvkm_event_fini(&i2c->event); list_for_each_entry_safe(port, temp, &i2c->ports, head) { nvkm_object_ref(NULL, (struct nvkm_object **)&port); } nvkm_subdev_destroy(&i2c->subdev); } static struct nvkm_oclass * nvkm_i2c_extdev_sclass[] = { nvkm_anx9805_sclass, }; static void nvkm_i2c_create_port(struct nvkm_i2c *i2c, int index, u8 type, struct dcb_i2c_entry *info) { const struct nvkm_i2c_impl *impl = (void *)nv_oclass(i2c); struct nvkm_oclass *oclass; struct nvkm_object *parent; struct nvkm_object *object; int ret, pad; if (info->share != DCB_I2C_UNUSED) { pad = info->share; oclass = impl->pad_s; } else { if (type != DCB_I2C_NVIO_AUX) pad = 0x100 + info->drive; else pad = 0x100 + info->auxch; oclass = impl->pad_x; } ret = nvkm_object_ctor(nv_object(i2c), NULL, oclass, NULL, pad, &parent); if (ret < 0) return; oclass = impl->sclass; do { ret = -EINVAL; if (oclass->handle == type) { ret = nvkm_object_ctor(parent, NULL, oclass, info, index, &object); } } while (ret && (++oclass)->handle); nvkm_object_ref(NULL, &parent); } int nvkm_i2c_create_(struct nvkm_object *parent, struct nvkm_object *engine, struct nvkm_oclass *oclass, int length, void **pobject) { struct nvkm_bios *bios = nvkm_bios(parent); struct nvkm_i2c *i2c; struct nvkm_object *object; struct dcb_i2c_entry info; int ret, i, j, index = -1; struct dcb_output outp; u8 ver, hdr; u32 data; ret = nvkm_subdev_create(parent, engine, oclass, 0, "I2C", "i2c", &i2c); *pobject = nv_object(i2c); if (ret) return ret; nv_subdev(i2c)->intr = nvkm_i2c_intr; i2c->find = nvkm_i2c_find; i2c->find_type = nvkm_i2c_find_type; i2c->acquire_pad = nvkm_i2c_acquire_pad; i2c->release_pad = nvkm_i2c_release_pad; i2c->acquire = nvkm_i2c_acquire; i2c->release = nvkm_i2c_release; i2c->identify = nvkm_i2c_identify; init_waitqueue_head(&i2c->wait); INIT_LIST_HEAD(&i2c->ports); while (!dcb_i2c_parse(bios, ++index, &info)) { switch (info.type) { case DCB_I2C_NV04_BIT: case DCB_I2C_NV4E_BIT: case DCB_I2C_NVIO_BIT: nvkm_i2c_create_port(i2c, NV_I2C_PORT(index), info.type, &info); break; case DCB_I2C_NVIO_AUX: nvkm_i2c_create_port(i2c, NV_I2C_AUX(index), info.type, &info); break; case DCB_I2C_PMGR: if (info.drive != DCB_I2C_UNUSED) { nvkm_i2c_create_port(i2c, NV_I2C_PORT(index), DCB_I2C_NVIO_BIT, &info); } if (info.auxch != DCB_I2C_UNUSED) { nvkm_i2c_create_port(i2c, NV_I2C_AUX(index), DCB_I2C_NVIO_AUX, &info); } break; case DCB_I2C_UNUSED: default: continue; } } /* in addition to the busses specified in the i2c table, there * may be ddc/aux channels hiding behind external tmds/dp/etc * transmitters. */ index = NV_I2C_EXT(0); i = -1; while ((data = dcb_outp_parse(bios, ++i, &ver, &hdr, &outp))) { if (!outp.location || !outp.extdev) continue; switch (outp.type) { case DCB_OUTPUT_TMDS: info.type = NV_I2C_TYPE_EXTDDC(outp.extdev); break; case DCB_OUTPUT_DP: info.type = NV_I2C_TYPE_EXTAUX(outp.extdev); break; default: continue; } ret = -ENODEV; j = -1; while (ret && ++j < ARRAY_SIZE(nvkm_i2c_extdev_sclass)) { parent = nv_object(i2c->find(i2c, outp.i2c_index)); oclass = nvkm_i2c_extdev_sclass[j]; do { if (oclass->handle != info.type) continue; ret = nvkm_object_ctor(parent, NULL, oclass, NULL, index++, &object); } while (ret && (++oclass)->handle); } } ret = nvkm_event_init(&nvkm_i2c_intr_func, 4, index, &i2c->event); if (ret) return ret; return 0; } int _nvkm_i2c_ctor(struct nvkm_object *parent, struct nvkm_object *engine, struct nvkm_oclass *oclass, void *data, u32 size, struct nvkm_object **pobject) { struct nvkm_i2c *i2c; int ret; ret = nvkm_i2c_create(parent, engine, oclass, &i2c); *pobject = nv_object(i2c); if (ret) return ret; return 0; }