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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busgf119.c (3145B)

      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 gf119_i2c_bus(p) container_of((p), struct gf119_i2c_bus, base)
     25#include "bus.h"
     26
     27struct gf119_i2c_bus {
     28	struct nvkm_i2c_bus base;
     29	u32 addr;
     30};
     31
     32static void
     33gf119_i2c_bus_drive_scl(struct nvkm_i2c_bus *base, int state)
     34{
     35	struct gf119_i2c_bus *bus = gf119_i2c_bus(base);
     36	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
     37	nvkm_mask(device, bus->addr, 0x00000001, state ? 0x00000001 : 0);
     38}
     39
     40static void
     41gf119_i2c_bus_drive_sda(struct nvkm_i2c_bus *base, int state)
     42{
     43	struct gf119_i2c_bus *bus = gf119_i2c_bus(base);
     44	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
     45	nvkm_mask(device, bus->addr, 0x00000002, state ? 0x00000002 : 0);
     46}
     47
     48static int
     49gf119_i2c_bus_sense_scl(struct nvkm_i2c_bus *base)
     50{
     51	struct gf119_i2c_bus *bus = gf119_i2c_bus(base);
     52	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
     53	return !!(nvkm_rd32(device, bus->addr) & 0x00000010);
     54}
     55
     56static int
     57gf119_i2c_bus_sense_sda(struct nvkm_i2c_bus *base)
     58{
     59	struct gf119_i2c_bus *bus = gf119_i2c_bus(base);
     60	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
     61	return !!(nvkm_rd32(device, bus->addr) & 0x00000020);
     62}
     63
     64static void
     65gf119_i2c_bus_init(struct nvkm_i2c_bus *base)
     66{
     67	struct gf119_i2c_bus *bus = gf119_i2c_bus(base);
     68	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
     69	nvkm_wr32(device, bus->addr, 0x00000007);
     70}
     71
     72static const struct nvkm_i2c_bus_func
     73gf119_i2c_bus_func = {
     74	.init = gf119_i2c_bus_init,
     75	.drive_scl = gf119_i2c_bus_drive_scl,
     76	.drive_sda = gf119_i2c_bus_drive_sda,
     77	.sense_scl = gf119_i2c_bus_sense_scl,
     78	.sense_sda = gf119_i2c_bus_sense_sda,
     79	.xfer = nvkm_i2c_bit_xfer,
     80};
     81
     82int
     83gf119_i2c_bus_new(struct nvkm_i2c_pad *pad, int id, u8 drive,
     84		 struct nvkm_i2c_bus **pbus)
     85{
     86	struct gf119_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(&gf119_i2c_bus_func, pad, id, &bus->base);
     93	bus->addr = 0x00d014 + (drive * 0x20);
     94	return 0;
     95}