cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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busnv04.c (3070B)

      1/*
      2 * Copyright 2015 Red Hat Inc.
      3 *
      4 * Permission is hereby granted, free of charge, to any person obtaining a
      5 * copy of this software and associated documentation files (the "Software"),
      6 * to deal in the Software without restriction, including without limitation
      7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
      8 * and/or sell copies of the Software, and to permit persons to whom the
      9 * Software is furnished to do so, subject to the following conditions:
     10 *
     11 * The above copyright notice and this permission notice shall be included in
     12 * all copies or substantial busions of the Software.
     13 *
     14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
     17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
     18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
     19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
     20 * OTHER DEALINGS IN THE SOFTWARE.
     21 *
     22 * Authors: Ben Skeggs <bskeggs@redhat.com>
     23 */
     24#define nv04_i2c_bus(p) container_of((p), struct nv04_i2c_bus, base)
     25#include "bus.h"
     26
     27#include <subdev/vga.h>
     28
     29struct nv04_i2c_bus {
     30	struct nvkm_i2c_bus base;
     31	u8 drive;
     32	u8 sense;
     33};
     34
     35static void
     36nv04_i2c_bus_drive_scl(struct nvkm_i2c_bus *base, int state)
     37{
     38	struct nv04_i2c_bus *bus = nv04_i2c_bus(base);
     39	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
     40	u8 val = nvkm_rdvgac(device, 0, bus->drive);
     41	if (state) val |= 0x20;
     42	else	   val &= 0xdf;
     43	nvkm_wrvgac(device, 0, bus->drive, val | 0x01);
     44}
     45
     46static void
     47nv04_i2c_bus_drive_sda(struct nvkm_i2c_bus *base, int state)
     48{
     49	struct nv04_i2c_bus *bus = nv04_i2c_bus(base);
     50	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
     51	u8 val = nvkm_rdvgac(device, 0, bus->drive);
     52	if (state) val |= 0x10;
     53	else	   val &= 0xef;
     54	nvkm_wrvgac(device, 0, bus->drive, val | 0x01);
     55}
     56
     57static int
     58nv04_i2c_bus_sense_scl(struct nvkm_i2c_bus *base)
     59{
     60	struct nv04_i2c_bus *bus = nv04_i2c_bus(base);
     61	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
     62	return !!(nvkm_rdvgac(device, 0, bus->sense) & 0x04);
     63}
     64
     65static int
     66nv04_i2c_bus_sense_sda(struct nvkm_i2c_bus *base)
     67{
     68	struct nv04_i2c_bus *bus = nv04_i2c_bus(base);
     69	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
     70	return !!(nvkm_rdvgac(device, 0, bus->sense) & 0x08);
     71}
     72
     73static const struct nvkm_i2c_bus_func
     74nv04_i2c_bus_func = {
     75	.drive_scl = nv04_i2c_bus_drive_scl,
     76	.drive_sda = nv04_i2c_bus_drive_sda,
     77	.sense_scl = nv04_i2c_bus_sense_scl,
     78	.sense_sda = nv04_i2c_bus_sense_sda,
     79	.xfer = nvkm_i2c_bit_xfer,
     80};
     81
     82int
     83nv04_i2c_bus_new(struct nvkm_i2c_pad *pad, int id, u8 drive, u8 sense,
     84		 struct nvkm_i2c_bus **pbus)
     85{
     86	struct nv04_i2c_bus *bus;
     87
     88	if (!(bus = kzalloc(sizeof(*bus), GFP_KERNEL)))
     89		return -ENOMEM;
     90	*pbus = &bus->base;
     91
     92	nvkm_i2c_bus_ctor(&nv04_i2c_bus_func, pad, id, &bus->base);
     93	bus->drive = drive;
     94	bus->sense = sense;
     95	return 0;
     96}