diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/core/subdev/i2c/base.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/core/subdev/i2c/base.c | 102 |
1 files changed, 94 insertions, 8 deletions
diff --git a/drivers/gpu/drm/nouveau/core/subdev/i2c/base.c b/drivers/gpu/drm/nouveau/core/subdev/i2c/base.c index a230465..09ba2cc 100644 --- a/drivers/gpu/drm/nouveau/core/subdev/i2c/base.c +++ b/drivers/gpu/drm/nouveau/core/subdev/i2c/base.c @@ -31,6 +31,7 @@ #include <subdev/vga.h> #include "priv.h" +#include "pad.h" /****************************************************************************** * interface to linux i2c bit-banging algorithm @@ -90,6 +91,15 @@ nouveau_i2c_getsda(void *data) * base i2c "port" class implementation *****************************************************************************/ +int +_nouveau_i2c_port_fini(struct nouveau_object *object, bool suspend) +{ + struct nouveau_i2c_port *port = (void *)object; + struct nvkm_i2c_pad *pad = nvkm_i2c_pad(port); + nv_ofuncs(pad)->fini(nv_object(pad), suspend); + return nouveau_object_fini(&port->base, suspend); +} + void _nouveau_i2c_port_dtor(struct nouveau_object *object) { @@ -106,7 +116,7 @@ nouveau_i2c_port_create_(struct nouveau_object *parent, const struct nouveau_i2c_func *func, int size, void **pobject) { - struct nouveau_device *device = nv_device(parent); + struct nouveau_device *device = nv_device(engine); struct nouveau_i2c *i2c = (void *)engine; struct nouveau_i2c_port *port; int ret; @@ -123,6 +133,7 @@ nouveau_i2c_port_create_(struct nouveau_object *parent, port->index = index; port->aux = -1; port->func = func; + mutex_init(&port->mutex); if ( algo == &nouveau_i2c_bit_algo && !nouveau_boolopt(device->cfgopt, "NvI2C", CSTMSEL)) { @@ -202,18 +213,72 @@ nouveau_i2c_find_type(struct nouveau_i2c *i2c, u16 type) } static void +nouveau_i2c_release_pad(struct nouveau_i2c_port *port) +{ + struct nvkm_i2c_pad *pad = nvkm_i2c_pad(port); + struct nouveau_i2c *i2c = nouveau_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 +nouveau_i2c_try_acquire_pad(struct nouveau_i2c_port *port) +{ + struct nvkm_i2c_pad *pad = nvkm_i2c_pad(port); + + if (atomic_add_return(1, &nv_object(pad)->usecount) != 1) { + struct nouveau_object *owner = (void *)pad->port; + do { + if (owner == (void *)port) + return 0; + owner = owner->parent; + } while(owner); + nouveau_i2c_release_pad(port); + return -EBUSY; + } + + pad->next = port; + nv_ofuncs(pad)->init(nv_object(pad)); + return 0; +} + +static int +nouveau_i2c_acquire_pad(struct nouveau_i2c_port *port, unsigned long timeout) +{ + struct nouveau_i2c *i2c = nouveau_i2c(port); + + if (timeout) { + if (wait_event_timeout(i2c->wait, + nouveau_i2c_try_acquire_pad(port) == 0, + timeout) == 0) + return -EBUSY; + } else { + wait_event(i2c->wait, nouveau_i2c_try_acquire_pad(port) == 0); + } + + return 0; +} + +static void nouveau_i2c_release(struct nouveau_i2c_port *port) +__releases(pad->mutex) { - if (port->func->release) - port->func->release(port); + nouveau_i2c(port)->release_pad(port); + mutex_unlock(&port->mutex); } static int nouveau_i2c_acquire(struct nouveau_i2c_port *port, unsigned long timeout) +__acquires(pad->mutex) { - if (port->func->acquire) - port->func->acquire(port); - return 0; + int ret; + mutex_lock(&port->mutex); + if ((ret = nouveau_i2c(port)->acquire_pad(port, timeout))) + mutex_unlock(&port->mutex); + return ret; } static int @@ -391,7 +456,7 @@ nouveau_i2c_create_(struct nouveau_object *parent, struct nouveau_i2c *i2c; struct nouveau_object *object; struct dcb_i2c_entry info; - int ret, i, j, index = -1; + int ret, i, j, index = -1, pad; struct dcb_output outp; u8 ver, hdr; u32 data; @@ -405,24 +470,45 @@ nouveau_i2c_create_(struct nouveau_object *parent, nv_subdev(i2c)->intr = nouveau_i2c_intr; i2c->find = nouveau_i2c_find; i2c->find_type = nouveau_i2c_find_type; + i2c->acquire_pad = nouveau_i2c_acquire_pad; + i2c->release_pad = nouveau_i2c_release_pad; i2c->acquire = nouveau_i2c_acquire; i2c->release = nouveau_i2c_release; i2c->identify = nouveau_i2c_identify; + init_waitqueue_head(&i2c->wait); INIT_LIST_HEAD(&i2c->ports); while (!dcb_i2c_parse(bios, ++index, &info)) { if (info.type == DCB_I2C_UNUSED) continue; + if (info.share != DCB_I2C_UNUSED) { + if (info.type == DCB_I2C_NVIO_AUX) + pad = info.drive; + else + pad = info.share; + oclass = impl->pad_s; + } else { + pad = 0x100 + info.drive; + oclass = impl->pad_x; + } + + ret = nouveau_object_ctor(NULL, *pobject, oclass, + NULL, pad, &parent); + if (ret < 0) + continue; + oclass = impl->sclass; do { ret = -EINVAL; if (oclass->handle == info.type) { - ret = nouveau_object_ctor(*pobject, *pobject, + ret = nouveau_object_ctor(parent, *pobject, oclass, &info, index, &object); } } while (ret && (++oclass)->handle); + + nouveau_object_ref(NULL, &parent); } /* in addition to the busses specified in the i2c table, there |
