diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nvkm/subdev/i2c/busnv4e.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nvkm/subdev/i2c/busnv4e.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/busnv4e.c b/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/busnv4e.c new file mode 100644 index 000000000000..cdd73dcb1197 --- /dev/null +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/i2c/busnv4e.c @@ -0,0 +1,86 @@ +/* + * Copyright 2015 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 busions 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 <bskeggs@redhat.com> + */ +#define nv4e_i2c_bus(p) container_of((p), struct nv4e_i2c_bus, base) +#include "bus.h" + +struct nv4e_i2c_bus { + struct nvkm_i2c_bus base; + u32 addr; +}; + +static void +nv4e_i2c_bus_drive_scl(struct nvkm_i2c_bus *base, int state) +{ + struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base); + struct nvkm_device *device = bus->base.pad->i2c->subdev.device; + nvkm_mask(device, bus->addr, 0x2f, state ? 0x21 : 0x01); +} + +static void +nv4e_i2c_bus_drive_sda(struct nvkm_i2c_bus *base, int state) +{ + struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base); + struct nvkm_device *device = bus->base.pad->i2c->subdev.device; + nvkm_mask(device, bus->addr, 0x1f, state ? 0x11 : 0x01); +} + +static int +nv4e_i2c_bus_sense_scl(struct nvkm_i2c_bus *base) +{ + struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base); + struct nvkm_device *device = bus->base.pad->i2c->subdev.device; + return !!(nvkm_rd32(device, bus->addr) & 0x00040000); +} + +static int +nv4e_i2c_bus_sense_sda(struct nvkm_i2c_bus *base) +{ + struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base); + struct nvkm_device *device = bus->base.pad->i2c->subdev.device; + return !!(nvkm_rd32(device, bus->addr) & 0x00080000); +} + +static const struct nvkm_i2c_bus_func +nv4e_i2c_bus_func = { + .drive_scl = nv4e_i2c_bus_drive_scl, + .drive_sda = nv4e_i2c_bus_drive_sda, + .sense_scl = nv4e_i2c_bus_sense_scl, + .sense_sda = nv4e_i2c_bus_sense_sda, + .xfer = nvkm_i2c_bit_xfer, +}; + +int +nv4e_i2c_bus_new(struct nvkm_i2c_pad *pad, int id, u8 drive, + struct nvkm_i2c_bus **pbus) +{ + struct nv4e_i2c_bus *bus; + + if (!(bus = kzalloc(sizeof(*bus), GFP_KERNEL))) + return -ENOMEM; + *pbus = &bus->base; + + nvkm_i2c_bus_ctor(&nv4e_i2c_bus_func, pad, id, &bus->base); + bus->addr = 0x600800 + drive; + return 0; +} |