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/*
* Copyright 2006 Stephane Marchesin
* Copyright 2007 Maarten Maathuis
*
* 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
* 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 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 NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS 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 "nv_include.h"
/*
* DDC1 support only requires DDC_SDA_MASK,
* DDC2 support requires DDC_SDA_MASK and DDC_SCL_MASK
*/
#define DDC_SDA_READ_MASK (1 << 3)
#define DDC_SCL_READ_MASK (1 << 2)
#define DDC_SDA_WRITE_MASK (1 << 4)
#define DDC_SCL_WRITE_MASK (1 << 5)
static void
NVI2CGetBits(I2CBusPtr b, int *clock, int *data)
{
NVPtr pNv = NVPTR(xf86Screens[b->scrnIndex]);
struct dcb_i2c_entry *dcb_i2c = b->DriverPrivate.ptr;
unsigned char val;
/* Get the result. */
/* Doing this on head 0 seems fine. */
if (dcb_i2c->port_type == 4) /* C51 */
val = NVReadCRTC(pNv, 0, 0x600800 + dcb_i2c->read) >> 16;
else
val = NVReadVgaCrtc(pNv, 0, dcb_i2c->read);
*clock = (val & DDC_SCL_READ_MASK) != 0;
*data = (val & DDC_SDA_READ_MASK) != 0;
}
static void
NVI2CPutBits(I2CBusPtr b, int clock, int data)
{
NVPtr pNv = NVPTR(xf86Screens[b->scrnIndex]);
struct dcb_i2c_entry *dcb_i2c = b->DriverPrivate.ptr;
uint32_t val;
/* Doing this on head 0 seems fine. */
if (dcb_i2c->port_type == 4) /* C51 */
val = NVReadCRTC(pNv, 0, 0x600800 + dcb_i2c->write);
else
val = NVReadVgaCrtc(pNv, 0, dcb_i2c->write);
val = (val & ~0xf) | 1;
if (clock)
val |= DDC_SCL_WRITE_MASK;
else
val &= ~DDC_SCL_WRITE_MASK;
if (data)
val |= DDC_SDA_WRITE_MASK;
else
val &= ~DDC_SDA_WRITE_MASK;
/* Doing this on head 0 seems fine. */
if (dcb_i2c->port_type == 4) /* C51 */
NVWriteCRTC(pNv, 0, 0x600800 + dcb_i2c->write, val);
else
NVWriteVgaCrtc(pNv, 0, dcb_i2c->write, val);
}
static uint32_t NV50_GetI2CPort(ScrnInfoPtr pScrn, int index)
{
NVPtr pNv = NVPTR(pScrn);
if (index <= 3)
return 0xe138 + (index * 24);
/* I have my doubts that this is 100% correct everywhere,
* but this is the best guess based on the data we have.
*/
if (pNv->NVArch >= 0x90) /* 0x90, 0xA0 */
return 0xe1d4 + (index * 32);
return 0xe1e0 + (index * 24);
}
static void NV50_I2CPutBits(I2CBusPtr b, int clock, int data)
{
NVPtr pNv = NVPTR(xf86Screens[b->scrnIndex]);
struct dcb_i2c_entry *dcb_i2c = b->DriverPrivate.ptr;
NVWrite(pNv, NV50_GetI2CPort(xf86Screens[b->scrnIndex], dcb_i2c->write), (4 | clock | data << 1));
}
static void NV50_I2CGetBits(I2CBusPtr b, int *clock, int *data)
{
NVPtr pNv = NVPTR(xf86Screens[b->scrnIndex]);
struct dcb_i2c_entry *dcb_i2c = b->DriverPrivate.ptr;
unsigned char val;
val = NVRead(pNv, NV50_GetI2CPort(xf86Screens[b->scrnIndex], dcb_i2c->read));
*clock = !!(val & 1);
*data = !!(val & 2);
}
int
NV_I2CInit(ScrnInfoPtr pScrn, I2CBusPtr *bus_ptr, struct dcb_i2c_entry *dcb_i2c, char *name)
{
I2CBusPtr pI2CBus;
if (dcb_i2c->chan)
goto initialized;
if (!(pI2CBus = xf86CreateI2CBusRec()))
return -ENOMEM;
pI2CBus->BusName = name;
pI2CBus->scrnIndex = pScrn->scrnIndex;
if (dcb_i2c->port_type == 5) { /* NV50 */
pI2CBus->I2CPutBits = NV50_I2CPutBits;
pI2CBus->I2CGetBits = NV50_I2CGetBits;
/* Could this be used for the rest as well? */
pI2CBus->ByteTimeout = 2200; /* VESA DDC spec 3 p. 43 (+10 %) */
pI2CBus->StartTimeout = 550;
pI2CBus->BitTimeout = 40;
pI2CBus->ByteTimeout = 40;
pI2CBus->AcknTimeout = 40;
} else {
pI2CBus->I2CPutBits = NVI2CPutBits;
pI2CBus->I2CGetBits = NVI2CGetBits;
pI2CBus->AcknTimeout = 5;
}
pI2CBus->DriverPrivate.ptr = dcb_i2c;
if (!xf86I2CBusInit(pI2CBus))
return -EINVAL;
dcb_i2c->chan = pI2CBus;
initialized:
*bus_ptr = dcb_i2c->chan;
return 0;
}
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