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

mgag200_i2c.c (3996B)

      1/*
      2 * Copyright 2012 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
      6 * "Software"), to deal in the Software without restriction, including
      7 * without limitation the rights to use, copy, modify, merge, publish,
      8 * distribute, sub license, and/or sell copies of the Software, and to
      9 * permit persons to whom the Software is furnished to do so, subject to
     10 * the following conditions:
     11 *
     12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     13 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     14 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
     15 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
     16 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
     17 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
     18 * USE OR OTHER DEALINGS IN THE SOFTWARE.
     19 *
     20 * The above copyright notice and this permission notice (including the
     21 * next paragraph) shall be included in all copies or substantial portions
     22 * of the Software.
     23 *
     24 */
     25/*
     26 * Authors: Dave Airlie <airlied@redhat.com>
     27 */
     28
     29#include <linux/export.h>
     30#include <linux/i2c-algo-bit.h>
     31#include <linux/i2c.h>
     32#include <linux/pci.h>
     33
     34#include "mgag200_drv.h"
     35
     36static int mga_i2c_read_gpio(struct mga_device *mdev)
     37{
     38	WREG8(DAC_INDEX, MGA1064_GEN_IO_DATA);
     39	return RREG8(DAC_DATA);
     40}
     41
     42static void mga_i2c_set_gpio(struct mga_device *mdev, int mask, int val)
     43{
     44	int tmp;
     45
     46	WREG8(DAC_INDEX, MGA1064_GEN_IO_CTL);
     47	tmp = (RREG8(DAC_DATA) & mask) | val;
     48	WREG_DAC(MGA1064_GEN_IO_CTL, tmp);
     49	WREG_DAC(MGA1064_GEN_IO_DATA, 0);
     50}
     51
     52static inline void mga_i2c_set(struct mga_device *mdev, int mask, int state)
     53{
     54	if (state)
     55		state = 0;
     56	else
     57		state = mask;
     58	mga_i2c_set_gpio(mdev, ~mask, state);
     59}
     60
     61static void mga_gpio_setsda(void *data, int state)
     62{
     63	struct mga_i2c_chan *i2c = data;
     64	struct mga_device *mdev = to_mga_device(i2c->dev);
     65	mga_i2c_set(mdev, i2c->data, state);
     66}
     67
     68static void mga_gpio_setscl(void *data, int state)
     69{
     70	struct mga_i2c_chan *i2c = data;
     71	struct mga_device *mdev = to_mga_device(i2c->dev);
     72	mga_i2c_set(mdev, i2c->clock, state);
     73}
     74
     75static int mga_gpio_getsda(void *data)
     76{
     77	struct mga_i2c_chan *i2c = data;
     78	struct mga_device *mdev = to_mga_device(i2c->dev);
     79	return (mga_i2c_read_gpio(mdev) & i2c->data) ? 1 : 0;
     80}
     81
     82static int mga_gpio_getscl(void *data)
     83{
     84	struct mga_i2c_chan *i2c = data;
     85	struct mga_device *mdev = to_mga_device(i2c->dev);
     86	return (mga_i2c_read_gpio(mdev) & i2c->clock) ? 1 : 0;
     87}
     88
     89struct mga_i2c_chan *mgag200_i2c_create(struct drm_device *dev)
     90{
     91	struct mga_device *mdev = to_mga_device(dev);
     92	struct mga_i2c_chan *i2c;
     93	int ret;
     94	int data, clock;
     95
     96	WREG_DAC(MGA1064_GEN_IO_CTL2, 1);
     97	WREG_DAC(MGA1064_GEN_IO_DATA, 0xff);
     98	WREG_DAC(MGA1064_GEN_IO_CTL, 0);
     99
    100	switch (mdev->type) {
    101	case G200_SE_A:
    102	case G200_SE_B:
    103	case G200_EV:
    104	case G200_WB:
    105	case G200_EW3:
    106		data = 1;
    107		clock = 2;
    108		break;
    109	case G200_EH:
    110	case G200_EH3:
    111	case G200_ER:
    112		data = 2;
    113		clock = 1;
    114		break;
    115	default:
    116		data = 2;
    117		clock = 8;
    118		break;
    119	}
    120
    121	i2c = kzalloc(sizeof(struct mga_i2c_chan), GFP_KERNEL);
    122	if (!i2c)
    123		return NULL;
    124
    125	i2c->data = data;
    126	i2c->clock = clock;
    127	i2c->adapter.owner = THIS_MODULE;
    128	i2c->adapter.class = I2C_CLASS_DDC;
    129	i2c->adapter.dev.parent = dev->dev;
    130	i2c->dev = dev;
    131	i2c_set_adapdata(&i2c->adapter, i2c);
    132	snprintf(i2c->adapter.name, sizeof(i2c->adapter.name), "mga i2c");
    133
    134	i2c->adapter.algo_data = &i2c->bit;
    135
    136	i2c->bit.udelay = 10;
    137	i2c->bit.timeout = 2;
    138	i2c->bit.data = i2c;
    139	i2c->bit.setsda		= mga_gpio_setsda;
    140	i2c->bit.setscl		= mga_gpio_setscl;
    141	i2c->bit.getsda		= mga_gpio_getsda;
    142	i2c->bit.getscl		= mga_gpio_getscl;
    143
    144	ret = i2c_bit_add_bus(&i2c->adapter);
    145	if (ret) {
    146		kfree(i2c);
    147		i2c = NULL;
    148	}
    149	return i2c;
    150}
    151
    152void mgag200_i2c_destroy(struct mga_i2c_chan *i2c)
    153{
    154	if (!i2c)
    155		return;
    156	i2c_del_adapter(&i2c->adapter);
    157	kfree(i2c);
    158}
    159