drm/shared-core/radeon_ms_i2c.c

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/*
* Copyright 2007 Jérôme Glisse
* Copyright 2007 Alex Deucher
* Copyright 2007 Dave Airlie
* 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 on 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 (including the
* next paragraph) 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
* NON-INFRINGEMENT. IN NO EVENT SHALL ATI, VA LINUX SYSTEMS AND/OR
* THEIR SUPPLIERS 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 "radeon_ms.h"
static int get_clock(void *data)
{
struct radeon_ms_i2c *i2c = data;
struct drm_radeon_private *dev_priv = i2c->drm_dev->dev_private;
int v;
switch (i2c->reg) {
case VIPPAD_EN:
v = MMIO_R(VIPPAD_Y);
if ((REG_G(VIPPAD_Y, VIPPAD_Y_VHAD, v) & 2)) {
v = 1;
} else {
v = 0;
}
break;
case VIPPAD1_EN:
v = MMIO_R(VIPPAD1_Y);
if ((REG_G(VIPPAD1_Y, VIPPAD_Y_DVODATA, v) & 8)) {
v = 1;
} else {
v = 0;
}
break;
case GPIO_DDC1:
v = MMIO_R(GPIO_DDC1);
if ((GPIO_DDC1__DDC1_CLK_INPUT & v)) {
v = 1;
} else {
v = 0;
}
break;
case GPIO_DDC2:
v = MMIO_R(GPIO_DDC2);
if ((GPIO_DDC2__DDC2_CLK_INPUT & v)) {
v = 1;
} else {
v = 0;
}
break;
default:
v = 0;
break;
}
return v;
}
static int get_data(void *data)
{
struct radeon_ms_i2c *i2c = data;
struct drm_radeon_private *dev_priv = i2c->drm_dev->dev_private;
int v;
switch (i2c->reg) {
case VIPPAD_EN:
v = MMIO_R(VIPPAD_Y);
if ((REG_G(VIPPAD_Y, VIPPAD_Y_VHAD, v) & 1)) {
v = 1;
} else {
v = 0;
}
break;
case VIPPAD1_EN:
v = MMIO_R(VIPPAD1_Y);
if ((REG_G(VIPPAD1_Y, VIPPAD_Y_DVODATA, v) & 4)) {
v = 1;
} else {
v = 0;
}
break;
case GPIO_DDC1:
v = MMIO_R(GPIO_DDC1);
if ((GPIO_DDC1__DDC1_DATA_INPUT & v)) {
v = 1;
} else {
v = 0;
}
break;
case GPIO_DDC2:
v = MMIO_R(GPIO_DDC2);
if ((GPIO_DDC2__DDC2_DATA_INPUT & v)) {
v = 1;
} else {
v = 0;
}
break;
default:
v = 0;
break;
}
return v;
}
static void set_clock(void *i2c_priv, int clock)
{
struct radeon_ms_i2c *i2c = i2c_priv;
struct drm_radeon_private *dev_priv = i2c->drm_dev->dev_private;
int v, line;
v = MMIO_R(i2c->reg);
switch (i2c->reg) {
case VIPPAD_EN:
line = REG_G(VIPPAD_EN, VIPPAD_EN_VHAD, v) & ~2;
v &= ~VIPPAD_EN__VIPPAD_EN_VHAD__MASK;
if (!clock) {
v |= REG_S(VIPPAD_EN, VIPPAD_EN_VHAD, line | 2);
} else {
v |= REG_S(VIPPAD_EN, VIPPAD_EN_VHAD, line);
}
break;
case VIPPAD1_EN:
line = REG_G(VIPPAD1_EN, VIPPAD_EN_DVODATA, v) & ~8;
v &= ~VIPPAD1_EN__VIPPAD_EN_DVODATA__MASK;
if (!clock) {
v |= REG_S(VIPPAD1_EN, VIPPAD_EN_DVODATA, line | 8);
} else {
v |= REG_S(VIPPAD1_EN, VIPPAD_EN_DVODATA, line);
}
break;
case GPIO_DDC1:
v &= ~GPIO_DDC1__DDC1_CLK_OUT_EN;
if (!clock) {
v |= GPIO_DDC1__DDC1_CLK_OUT_EN;
}
break;
case GPIO_DDC2:
v &= ~GPIO_DDC2__DDC2_CLK_OUT_EN;
if (!clock) {
v |= GPIO_DDC2__DDC2_CLK_OUT_EN;
}
break;
default:
return;
}
MMIO_W(i2c->reg, v);
}
static void set_data(void *i2c_priv, int data)
{
struct radeon_ms_i2c *i2c = i2c_priv;
struct drm_radeon_private *dev_priv = i2c->drm_dev->dev_private;
int v, line;
v = MMIO_R(i2c->reg);
switch (i2c->reg) {
case VIPPAD_EN:
line = REG_G(VIPPAD_EN, VIPPAD_EN_VHAD, v) & ~1;
v &= ~VIPPAD_EN__VIPPAD_EN_VHAD__MASK;
if (!data) {
v |= REG_S(VIPPAD_EN, VIPPAD_EN_VHAD, line | 1);
} else {
v |= REG_S(VIPPAD_EN, VIPPAD_EN_VHAD, line);
}
break;
case VIPPAD1_EN:
line = REG_G(VIPPAD1_EN, VIPPAD_EN_DVODATA, v) & ~4;
v &= ~VIPPAD1_EN__VIPPAD_EN_DVODATA__MASK;
if (!data) {
v |= REG_S(VIPPAD1_EN, VIPPAD_EN_DVODATA, line | 4);
} else {
v |= REG_S(VIPPAD1_EN, VIPPAD_EN_DVODATA, line);
}
break;
case GPIO_DDC1:
v &= ~GPIO_DDC1__DDC1_DATA_OUT_EN;
if (!data) {
v |= GPIO_DDC1__DDC1_DATA_OUT_EN;
}
break;
case GPIO_DDC2:
v &= ~GPIO_DDC2__DDC2_DATA_OUT_EN;
if (!data) {
v |= GPIO_DDC2__DDC2_DATA_OUT_EN;
}
break;
default:
return;
}
MMIO_W(i2c->reg, v);
}
/**
* radeon_ms_i2c_create - instantiate an radeon i2c bus on specified GPIO reg
* @dev: DRM device
* @output: driver specific output device
* @reg: GPIO reg to use
* @name: name for this bus
*
* Creates and registers a new i2c bus with the Linux i2c layer, for use
* in output probing and control (e.g. DDC or SDVO control functions).
*
*/
struct radeon_ms_i2c *radeon_ms_i2c_create(struct drm_device *dev,
const uint32_t reg,
const char *name)
{
struct radeon_ms_i2c *i2c;
int ret;
i2c = drm_alloc(sizeof(struct radeon_ms_i2c), DRM_MEM_DRIVER);
if (i2c == NULL) {
return NULL;
}
memset(i2c, 0, sizeof(struct radeon_ms_i2c));
i2c->drm_dev = dev;
i2c->reg = reg;
snprintf(i2c->adapter.name, I2C_NAME_SIZE, "radeon-%s", name);
i2c->adapter.owner = THIS_MODULE;
/* fixme need to take a look at what its needed for */
i2c->adapter.id = I2C_HW_B_RADEON;
i2c->adapter.algo_data = &i2c->algo;
i2c->adapter.dev.parent = &dev->pdev->dev;
i2c->algo.setsda = set_data;
i2c->algo.setscl = set_clock;
i2c->algo.getsda = get_data;
i2c->algo.getscl = get_clock;
i2c->algo.udelay = 20;
i2c->algo.timeout = usecs_to_jiffies(2200);
i2c->algo.data = i2c;
i2c_set_adapdata(&i2c->adapter, i2c);
ret = i2c_bit_add_bus(&i2c->adapter);
if(ret) {
DRM_INFO("[radeon_ms] failed to register I2C '%s' bus\n",
i2c->adapter.name);
goto out_free;
}
DRM_INFO("[radeon_ms] registered I2C '%s' bus\n", i2c->adapter.name);
return i2c;
out_free:
drm_free(i2c, sizeof(struct radeon_ms_i2c), DRM_MEM_DRIVER);
return NULL;
}
/**
* radeon_ms_i2c_destroy - unregister and free i2c bus resources
* @output: channel to free
*
* Unregister the adapter from the i2c layer, then free the structure.
*/
void radeon_ms_i2c_destroy(struct radeon_ms_i2c *i2c)
{
if (i2c == NULL) {
return;
}
i2c_del_adapter(&i2c->adapter);
drm_free(i2c, sizeof(struct radeon_ms_i2c), DRM_MEM_DRIVER);
}