cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

busnv4e.c (2845B)

      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 nv4e_i2c_bus(p) container_of((p), struct nv4e_i2c_bus, base)
     25#include "bus.h"
     26
     27struct nv4e_i2c_bus {
     28	struct nvkm_i2c_bus base;
     29	u32 addr;
     30};
     31
     32static void
     33nv4e_i2c_bus_drive_scl(struct nvkm_i2c_bus *base, int state)
     34{
     35	struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);
     36	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
     37	nvkm_mask(device, bus->addr, 0x2f, state ? 0x21 : 0x01);
     38}
     39
     40static void
     41nv4e_i2c_bus_drive_sda(struct nvkm_i2c_bus *base, int state)
     42{
     43	struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);
     44	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
     45	nvkm_mask(device, bus->addr, 0x1f, state ? 0x11 : 0x01);
     46}
     47
     48static int
     49nv4e_i2c_bus_sense_scl(struct nvkm_i2c_bus *base)
     50{
     51	struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);
     52	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
     53	return !!(nvkm_rd32(device, bus->addr) & 0x00040000);
     54}
     55
     56static int
     57nv4e_i2c_bus_sense_sda(struct nvkm_i2c_bus *base)
     58{
     59	struct nv4e_i2c_bus *bus = nv4e_i2c_bus(base);
     60	struct nvkm_device *device = bus->base.pad->i2c->subdev.device;
     61	return !!(nvkm_rd32(device, bus->addr) & 0x00080000);
     62}
     63
     64static const struct nvkm_i2c_bus_func
     65nv4e_i2c_bus_func = {
     66	.drive_scl = nv4e_i2c_bus_drive_scl,
     67	.drive_sda = nv4e_i2c_bus_drive_sda,
     68	.sense_scl = nv4e_i2c_bus_sense_scl,
     69	.sense_sda = nv4e_i2c_bus_sense_sda,
     70	.xfer = nvkm_i2c_bit_xfer,
     71};
     72
     73int
     74nv4e_i2c_bus_new(struct nvkm_i2c_pad *pad, int id, u8 drive,
     75		 struct nvkm_i2c_bus **pbus)
     76{
     77	struct nv4e_i2c_bus *bus;
     78
     79	if (!(bus = kzalloc(sizeof(*bus), GFP_KERNEL)))
     80		return -ENOMEM;
     81	*pbus = &bus->base;
     82
     83	nvkm_i2c_bus_ctor(&nv4e_i2c_bus_func, pad, id, &bus->base);
     84	bus->addr = 0x600800 + drive;
     85	return 0;
     86}