114 lines
3.4 KiB
C
114 lines
3.4 KiB
C
/*
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* Copyright 2015 Red Hat Inc.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial busions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Authors: Ben Skeggs <bskeggs@redhat.com>
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*/
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#define nv50_i2c_bus(p) container_of((p), struct nv50_i2c_bus, base)
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#include "bus.h"
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#include <subdev/vga.h>
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struct nv50_i2c_bus {
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struct nvkm_i2c_bus base;
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u32 addr;
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u32 data;
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};
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static void
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nv50_i2c_bus_drive_scl(struct nvkm_i2c_bus *base, int state)
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{
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struct nv50_i2c_bus *bus = nv50_i2c_bus(base);
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struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
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if (state) bus->data |= 0x01;
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else bus->data &= 0xfe;
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nvkm_wr32(device, bus->addr, bus->data);
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}
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static void
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nv50_i2c_bus_drive_sda(struct nvkm_i2c_bus *base, int state)
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{
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struct nv50_i2c_bus *bus = nv50_i2c_bus(base);
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struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
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if (state) bus->data |= 0x02;
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else bus->data &= 0xfd;
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nvkm_wr32(device, bus->addr, bus->data);
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}
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static int
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nv50_i2c_bus_sense_scl(struct nvkm_i2c_bus *base)
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{
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struct nv50_i2c_bus *bus = nv50_i2c_bus(base);
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struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
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return !!(nvkm_rd32(device, bus->addr) & 0x00000001);
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}
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static int
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nv50_i2c_bus_sense_sda(struct nvkm_i2c_bus *base)
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{
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struct nv50_i2c_bus *bus = nv50_i2c_bus(base);
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struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
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return !!(nvkm_rd32(device, bus->addr) & 0x00000002);
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}
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static void
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nv50_i2c_bus_init(struct nvkm_i2c_bus *base)
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{
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struct nv50_i2c_bus *bus = nv50_i2c_bus(base);
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struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
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nvkm_wr32(device, bus->addr, (bus->data = 0x00000007));
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}
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static const struct nvkm_i2c_bus_func
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nv50_i2c_bus_func = {
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.init = nv50_i2c_bus_init,
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.drive_scl = nv50_i2c_bus_drive_scl,
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.drive_sda = nv50_i2c_bus_drive_sda,
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.sense_scl = nv50_i2c_bus_sense_scl,
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.sense_sda = nv50_i2c_bus_sense_sda,
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.xfer = nvkm_i2c_bit_xfer,
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};
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int
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nv50_i2c_bus_new(struct nvkm_i2c_pad *pad, int id, u8 drive,
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struct nvkm_i2c_bus **pbus)
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{
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static const u32 addr[] = {
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0x00e138, 0x00e150, 0x00e168, 0x00e180,
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0x00e254, 0x00e274, 0x00e764, 0x00e780,
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0x00e79c, 0x00e7b8
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};
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struct nv50_i2c_bus *bus;
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if (drive >= ARRAY_SIZE(addr)) {
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nvkm_warn(&pad->i2c->subdev, "bus %d unknown\n", drive);
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return -ENODEV;
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}
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if (!(bus = kzalloc(sizeof(*bus), GFP_KERNEL)))
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return -ENOMEM;
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*pbus = &bus->base;
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nvkm_i2c_bus_ctor(&nv50_i2c_bus_func, pad, id, &bus->base);
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bus->addr = addr[drive];
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bus->data = 0x00000007;
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return 0;
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}
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