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/*
* Copyright 2012 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 <subdev/vga.h>
struct nv04_i2c_priv {
struct nvkm_i2c base;
};
struct nv04_i2c_port {
struct nvkm_i2c_port base;
u8 drive;
u8 sense;
};
static void
nv04_i2c_drive_scl(struct nvkm_i2c_port *base, int state)
{
struct nv04_i2c_priv *priv = (void *)nvkm_i2c(base);
struct nv04_i2c_port *port = (void *)base;
u8 val = nv_rdvgac(priv, 0, port->drive);
if (state) val |= 0x20;
else val &= 0xdf;
nv_wrvgac(priv, 0, port->drive, val | 0x01);
}
static void
nv04_i2c_drive_sda(struct nvkm_i2c_port *base, int state)
{
struct nv04_i2c_priv *priv = (void *)nvkm_i2c(base);
struct nv04_i2c_port *port = (void *)base;
u8 val = nv_rdvgac(priv, 0, port->drive);
if (state) val |= 0x10;
else val &= 0xef;
nv_wrvgac(priv, 0, port->drive, val | 0x01);
}
static int
nv04_i2c_sense_scl(struct nvkm_i2c_port *base)
{
struct nv04_i2c_priv *priv = (void *)nvkm_i2c(base);
struct nv04_i2c_port *port = (void *)base;
return !!(nv_rdvgac(priv, 0, port->sense) & 0x04);
}
static int
nv04_i2c_sense_sda(struct nvkm_i2c_port *base)
{
struct nv04_i2c_priv *priv = (void *)nvkm_i2c(base);
struct nv04_i2c_port *port = (void *)base;
return !!(nv_rdvgac(priv, 0, port->sense) & 0x08);
}
static const struct nvkm_i2c_func
nv04_i2c_func = {
.drive_scl = nv04_i2c_drive_scl,
.drive_sda = nv04_i2c_drive_sda,
.sense_scl = nv04_i2c_sense_scl,
.sense_sda = nv04_i2c_sense_sda,
};
static int
nv04_i2c_port_ctor(struct nvkm_object *parent, struct nvkm_object *engine,
struct nvkm_oclass *oclass, void *data, u32 index,
struct nvkm_object **pobject)
{
struct dcb_i2c_entry *info = data;
struct nv04_i2c_port *port;
int ret;
ret = nvkm_i2c_port_create(parent, engine, oclass, index,
&nvkm_i2c_bit_algo, &nv04_i2c_func, &port);
*pobject = nv_object(port);
if (ret)
return ret;
port->drive = info->drive;
port->sense = info->sense;
return 0;
}
static struct nvkm_oclass
nv04_i2c_sclass[] = {
{ .handle = NV_I2C_TYPE_DCBI2C(DCB_I2C_NV04_BIT),
.ofuncs = &(struct nvkm_ofuncs) {
.ctor = nv04_i2c_port_ctor,
.dtor = _nvkm_i2c_port_dtor,
.init = _nvkm_i2c_port_init,
.fini = _nvkm_i2c_port_fini,
},
},
{}
};
struct nvkm_oclass *
nv04_i2c_oclass = &(struct nvkm_i2c_impl) {
.base.handle = NV_SUBDEV(I2C, 0x04),
.base.ofuncs = &(struct nvkm_ofuncs) {
.ctor = _nvkm_i2c_ctor,
.dtor = _nvkm_i2c_dtor,
.init = _nvkm_i2c_init,
.fini = _nvkm_i2c_fini,
},
.sclass = nv04_i2c_sclass,
.pad_x = &nv04_i2c_pad_oclass,
}.base;
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