* add function to set up i2c bus for connector

* few tab fixes
* add Axel as author as the base i2c stuff is from intel_extreme


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@42709 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/accelerants/radeon_hd/display.cpp

@@ -564,17 +564,9 @@ detect_connectors()
 										= (ATOM_I2C_ID_CONFIG_ACCESS *)
 										&i2c_record->sucI2cId;
 
-									// i2c_config->ucAccess is gpio_id
-
-									// ddc_bus = radeon_lookup_i2c_gpio(rdev,
-									//	i2c_config->ucAccess);
-
-									TRACE("Found i2c record: GPIO: 0x%"
-										B_PRIx32 "\n", i2c_config->ucAccess);
-
-									// ddc2_init_timing(
-									//	&gConnector[connector_index]->connector_i2c);
-
+									// set up i2c bus for connector
+									radeon_gpu_i2c_setup(connector_index,
+										i2c_config->ucAccess);
 									break;
 								case ATOM_HPD_INT_RECORD_TYPE:
 									// TODO : HPD (Hot Plug)

src/add-ons/accelerants/radeon_hd/gpu.cpp

@@ -3,7 +3,8 @@
  * Distributed under the terms of the MIT License.
  *
  * Authors:
- *      Alexander von Gluck, [email protected]
+ *		Alexander von Gluck, [email protected]
+ *		Axel Dörfler, [email protected]
  */
 
 
@@ -273,3 +274,109 @@ radeon_gpu_irq_setup()
 
 	return B_ERROR;
 }
+
+
+static status_t
+get_i2c_signals(void* cookie, int* _clock, int* _data)
+{
+	#if 0
+	uint32 ioRegister = (uint32)cookie;
+	uint32 value = read32(ioRegister);
+
+	*_clock = (value & I2C_CLOCK_VALUE_IN) != 0;
+	*_data = (value & I2C_DATA_VALUE_IN) != 0;
+	#endif
+
+	return B_OK;
+}
+
+
+static status_t
+set_i2c_signals(void* cookie, int clock, int data)
+{
+	#if 0
+	uint32 ioRegister = (uint32)cookie;
+	uint32 value = read32(OUT, ioRegister) & I2C_RESERVED;
+
+	if (data != 0)
+		value |= I2C_DATA_DIRECTION_MASK;
+	else {
+		value |= I2C_DATA_DIRECTION_MASK
+			| I2C_DATA_DIRECTION_OUT
+			| I2C_DATA_VALUE_MASK;
+	}
+
+	if (clock != 0)
+		value |= I2C_CLOCK_DIRECTION_MASK;
+	else
+		value |= I2C_CLOCK_DIRECTION_MASK
+			| I2C_CLOCK_DIRECTION_OUT
+			| I2C_CLOCK_VALUE_MASK;
+
+	write32(OUT, ioRegister, value);
+	read32(OUT, ioRegister);
+		// make sure the PCI bus has flushed the write
+	#endif
+
+	return B_OK;
+}
+
+
+status_t
+radeon_gpu_i2c_setup(uint32 connector, uint8 gpio_id)
+{
+	// aka radeon_lookup_i2c_gpio
+	TRACE("%s: Path #%" B_PRId32 ": GPIO Pin 0x%" B_PRIx8 "\n", __func__,
+		connector, gpio_id);
+
+	ATOM_GPIO_I2C_ASSIGMENT *gpio;
+	struct _ATOM_GPIO_I2C_INFO *i2c_info;
+	int index = GetIndexIntoMasterTable(DATA, GPIO_I2C_Info);
+	uint16 offset;
+	uint16 size;
+
+	if (atom_parse_data_header(gAtomContext, index,
+		&size, NULL, NULL, &offset)) {
+
+		i2c_info = (struct _ATOM_GPIO_I2C_INFO *)(gAtomContext->bios + offset);
+
+		uint32 num_indices = (size - sizeof(ATOM_COMMON_TABLE_HEADER))
+			/ sizeof(ATOM_GPIO_I2C_ASSIGMENT);
+
+		for (uint32 i = 0; i < num_indices; i++) {
+			gpio = &i2c_info->asGPIO_Info[i];
+
+			// TODO : if DCE 4 and i == 7 ... manual override for evergreen
+			// TODO : if DCE 3 and i == 4 ... manual override
+
+			if (gpio->sucI2cId.ucAccess == gpio_id) {
+				i2c_bus bus;
+
+				// successful lookup
+				TRACE("%s: successful i2c gpio lookup\n", __func__);
+
+				// pull registers for data and clock...
+				uint16 analogDataReg
+					= B_LENDIAN_TO_HOST_INT16(gpio->usDataA_RegisterIndex) * 4;
+				//uint16 analogClockReg
+				//	= B_LENDIAN_TO_HOST_INT16(gpio->usClkA_RegisterIndex) * 4;
+				//uint16 digitalDataReg
+				//	= B_LENDIAN_TO_HOST_INT16(gpio->usDataY_RegisterIndex) * 4;
+				//uint16 digitalClockReg
+				//	= B_LENDIAN_TO_HOST_INT16(gpio->usClkY_RegisterIndex) * 4;
+
+				// populate cookie with analog data register
+				bus.cookie = (void*)analogDataReg;
+				bus.set_signals = &set_i2c_signals;
+				bus.get_signals = &get_i2c_signals;
+
+				ddc2_init_timing(&bus);
+				// TODO : check for valid analog edid
+				// TODO : check for valid digital edid no results on analog
+			}
+		}
+
+	}
+
+	return B_OK;
+}

src/add-ons/accelerants/radeon_hd/gpu.h

@@ -3,7 +3,7 @@
  * Distributed under the terms of the MIT License.
  *
  * Authors:
- *      Alexander von Gluck, [email protected]
+ *		Alexander von Gluck, [email protected]
  */
 #ifndef RADEON_HD_GPU_H
 #define RADEON_HD_GPU_H
@@ -168,6 +168,7 @@ void radeon_gpu_mc_resume();
 uint32 radeon_gpu_mc_idlecheck();
 status_t radeon_gpu_mc_setup();
 status_t radeon_gpu_irq_setup();
+status_t radeon_gpu_i2c_setup(uint32 connector, uint8 gpio_id);
 
 
 #endif