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 | 365 |
1 files changed, 365 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/core/subdev/i2c/base.c b/drivers/gpu/drm/nouveau/core/subdev/i2c/base.c new file mode 100644 index 0000000..8ae2625 --- /dev/null +++ b/drivers/gpu/drm/nouveau/core/subdev/i2c/base.c @@ -0,0 +1,365 @@ +/* + * 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 <core/option.h> + +#include <subdev/bios.h> +#include <subdev/bios/dcb.h> +#include <subdev/bios/i2c.h> +#include <subdev/i2c.h> +#include <subdev/vga.h> + +/****************************************************************************** + * interface to linux i2c bit-banging algorithm + *****************************************************************************/ + +#ifdef CONFIG_NOUVEAU_I2C_INTERNAL_DEFAULT +#define CSTMSEL true +#else +#define CSTMSEL false +#endif + +static int +nouveau_i2c_pre_xfer(struct i2c_adapter *adap) +{ + struct i2c_algo_bit_data *bit = adap->algo_data; + struct nouveau_i2c_port *port = bit->data; + if (port->func->acquire) + port->func->acquire(port); + return 0; +} + +static void +nouveau_i2c_setscl(void *data, int state) +{ + struct nouveau_i2c_port *port = data; + port->func->drive_scl(port, state); +} + +static void +nouveau_i2c_setsda(void *data, int state) +{ + struct nouveau_i2c_port *port = data; + port->func->drive_sda(port, state); +} + +static int +nouveau_i2c_getscl(void *data) +{ + struct nouveau_i2c_port *port = data; + return port->func->sense_scl(port); +} + +static int +nouveau_i2c_getsda(void *data) +{ + struct nouveau_i2c_port *port = data; + return port->func->sense_sda(port); +} + +/****************************************************************************** + * base i2c "port" class implementation + *****************************************************************************/ + +void +_nouveau_i2c_port_dtor(struct nouveau_object *object) +{ + struct nouveau_i2c_port *port = (void *)object; + i2c_del_adapter(&port->adapter); + nouveau_object_destroy(&port->base); +} + +int +nouveau_i2c_port_create_(struct nouveau_object *parent, + struct nouveau_object *engine, + struct nouveau_oclass *oclass, u8 index, + const struct i2c_algorithm *algo, + int size, void **pobject) +{ + struct nouveau_device *device = nv_device(parent); + struct nouveau_i2c *i2c = (void *)engine; + struct nouveau_i2c_port *port; + int ret; + + ret = nouveau_object_create_(parent, engine, oclass, 0, size, pobject); + port = *pobject; + if (ret) + return ret; + + snprintf(port->adapter.name, sizeof(port->adapter.name), + "nouveau-%s-%d", device->name, index); + port->adapter.owner = THIS_MODULE; + port->adapter.dev.parent = &device->pdev->dev; + port->index = index; + i2c_set_adapdata(&port->adapter, i2c); + + if ( algo == &nouveau_i2c_bit_algo && + !nouveau_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 = nouveau_i2c_pre_xfer; + bit->setsda = nouveau_i2c_setsda; + bit->setscl = nouveau_i2c_setscl; + bit->getsda = nouveau_i2c_getsda; + bit->getscl = nouveau_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); + } + + /* drop port's i2c subdev refcount, i2c handles this itself */ + if (ret == 0) + list_add_tail(&port->head, &i2c->ports); + return ret; +} + +/****************************************************************************** + * base i2c subdev class implementation + *****************************************************************************/ + +static struct nouveau_i2c_port * +nouveau_i2c_find(struct nouveau_i2c *i2c, u8 index) +{ + struct nouveau_bios *bios = nouveau_bios(i2c); + struct nouveau_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 nouveau_i2c_port * +nouveau_i2c_find_type(struct nouveau_i2c *i2c, u16 type) +{ + struct nouveau_i2c_port *port; + + list_for_each_entry(port, &i2c->ports, head) { + if (nv_hclass(port) == type) + return port; + } + + return NULL; +} + +static int +nouveau_i2c_identify(struct nouveau_i2c *i2c, int index, const char *what, + struct i2c_board_info *info, + bool (*match)(struct nouveau_i2c_port *, + struct i2c_board_info *)) +{ + struct nouveau_i2c_port *port = nouveau_i2c_find(i2c, index); + int i; + + if (!port) { + nv_debug(i2c, "no bus when probing %s on %d\n", what, index); + return -ENODEV; + } + + nv_debug(i2c, "probing %ss on bus: %d\n", what, port->index); + for (i = 0; info[i].addr; i++) { + if (nv_probe_i2c(port, info[i].addr) && + (!match || match(port, &info[i]))) { + nv_info(i2c, "detected %s: %s\n", what, info[i].type); + return i; + } + } + + nv_debug(i2c, "no devices found.\n"); + return -ENODEV; +} + +int +_nouveau_i2c_fini(struct nouveau_object *object, bool suspend) +{ + struct nouveau_i2c *i2c = (void *)object; + struct nouveau_i2c_port *port; + int ret; + + list_for_each_entry(port, &i2c->ports, head) { + ret = nv_ofuncs(port)->fini(nv_object(port), suspend); + if (ret && suspend) + goto fail; + } + + return nouveau_subdev_fini(&i2c->base, suspend); +fail: + list_for_each_entry_continue_reverse(port, &i2c->ports, head) { + nv_ofuncs(port)->init(nv_object(port)); + } + + return ret; +} + +int +_nouveau_i2c_init(struct nouveau_object *object) +{ + struct nouveau_i2c *i2c = (void *)object; + struct nouveau_i2c_port *port; + int ret; + + ret = nouveau_subdev_init(&i2c->base); + 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 +_nouveau_i2c_dtor(struct nouveau_object *object) +{ + struct nouveau_i2c *i2c = (void *)object; + struct nouveau_i2c_port *port, *temp; + + list_for_each_entry_safe(port, temp, &i2c->ports, head) { + nouveau_object_ref(NULL, (struct nouveau_object **)&port); + } + + nouveau_subdev_destroy(&i2c->base); +} + +static struct nouveau_oclass * +nouveau_i2c_extdev_sclass[] = { + nouveau_anx9805_sclass, +}; + +int +nouveau_i2c_create_(struct nouveau_object *parent, + struct nouveau_object *engine, + struct nouveau_oclass *oclass, + struct nouveau_oclass *sclass, + int length, void **pobject) +{ + struct nouveau_bios *bios = nouveau_bios(parent); + struct nouveau_i2c *i2c; + struct nouveau_object *object; + struct dcb_i2c_entry info; + int ret, i, j, index = -1; + struct dcb_output outp; + u8 ver, hdr; + u32 data; + + ret = nouveau_subdev_create(parent, engine, oclass, 0, + "I2C", "i2c", &i2c); + *pobject = nv_object(i2c); + if (ret) + return ret; + + i2c->find = nouveau_i2c_find; + i2c->find_type = nouveau_i2c_find_type; + i2c->identify = nouveau_i2c_identify; + INIT_LIST_HEAD(&i2c->ports); + + while (!dcb_i2c_parse(bios, ++index, &info)) { + if (info.type == DCB_I2C_UNUSED) + continue; + + oclass = sclass; + do { + ret = -EINVAL; + if (oclass->handle == info.type) { + ret = nouveau_object_ctor(*pobject, *pobject, + oclass, &info, + index, &object); + } + } while (ret && (++oclass)->handle); + } + + /* in addition to the busses specified in the i2c table, there + * may be ddc/aux channels hiding behind external tmds/dp/etc + * transmitters. + */ + index = ((index + 0x0f) / 0x10) * 0x10; + 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(nouveau_i2c_extdev_sclass)) { + parent = nv_object(i2c->find(i2c, outp.i2c_index)); + oclass = nouveau_i2c_extdev_sclass[j]; + do { + if (oclass->handle != info.type) + continue; + ret = nouveau_object_ctor(parent, *pobject, + oclass, NULL, + index++, &object); + } while (ret && (++oclass)->handle); + } + } + + return 0; +} |