90 lines
2.6 KiB
C
90 lines
2.6 KiB
C
/*
|
|
* Copyright (c) 2014, NVIDIA CORPORATION. All rights reserved.
|
|
*
|
|
* 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 AUTHORS OR COPYRIGHT HOLDERS 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.
|
|
*/
|
|
#include <subdev/ibus.h>
|
|
#include <subdev/timer.h>
|
|
|
|
static void
|
|
gk20a_ibus_init_ibus_ring(struct nvkm_subdev *ibus)
|
|
{
|
|
struct nvkm_device *device = ibus->device;
|
|
nvkm_mask(device, 0x137250, 0x3f, 0);
|
|
|
|
nvkm_mask(device, 0x000200, 0x20, 0);
|
|
udelay(20);
|
|
nvkm_mask(device, 0x000200, 0x20, 0x20);
|
|
|
|
nvkm_wr32(device, 0x12004c, 0x4);
|
|
nvkm_wr32(device, 0x122204, 0x2);
|
|
nvkm_rd32(device, 0x122204);
|
|
|
|
/*
|
|
* Bug: increase clock timeout to avoid operation failure at high
|
|
* gpcclk rate.
|
|
*/
|
|
nvkm_wr32(device, 0x122354, 0x800);
|
|
nvkm_wr32(device, 0x128328, 0x800);
|
|
nvkm_wr32(device, 0x124320, 0x800);
|
|
}
|
|
|
|
static void
|
|
gk20a_ibus_intr(struct nvkm_subdev *ibus)
|
|
{
|
|
struct nvkm_device *device = ibus->device;
|
|
u32 status0 = nvkm_rd32(device, 0x120058);
|
|
|
|
if (status0 & 0x7) {
|
|
nvkm_debug(ibus, "resetting ibus ring\n");
|
|
gk20a_ibus_init_ibus_ring(ibus);
|
|
}
|
|
|
|
/* Acknowledge interrupt */
|
|
nvkm_mask(device, 0x12004c, 0x2, 0x2);
|
|
nvkm_msec(device, 2000,
|
|
if (!(nvkm_rd32(device, 0x12004c) & 0x0000003f))
|
|
break;
|
|
);
|
|
}
|
|
|
|
static int
|
|
gk20a_ibus_init(struct nvkm_subdev *ibus)
|
|
{
|
|
gk20a_ibus_init_ibus_ring(ibus);
|
|
return 0;
|
|
}
|
|
|
|
static const struct nvkm_subdev_func
|
|
gk20a_ibus = {
|
|
.init = gk20a_ibus_init,
|
|
.intr = gk20a_ibus_intr,
|
|
};
|
|
|
|
int
|
|
gk20a_ibus_new(struct nvkm_device *device, int index,
|
|
struct nvkm_subdev **pibus)
|
|
{
|
|
struct nvkm_subdev *ibus;
|
|
if (!(ibus = *pibus = kzalloc(sizeof(*ibus), GFP_KERNEL)))
|
|
return -ENOMEM;
|
|
nvkm_subdev_ctor(&gk20a_ibus, device, index, ibus);
|
|
return 0;
|
|
}
|