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/*

 * Copyright 2007-8 Advanced Micro Devices, Inc.

 * Copyright 2008 Red Hat Inc.

 *

 * 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.

 *

 * Authors: Dave Airlie

 *          Alex Deucher

 */

#include "drmP.h"

#include "radeon_drm.h"

#include "radeon.h"

/**

 * radeon_ddc_probe

 *

 */

bool radeon_ddc_probe(struct radeon_connector *radeon_connector)

{

	u8 out_buf[] = { 0x0, 0x0};

	u8 buf[2];

	int ret;

	struct i2c_msg msgs[] = {

		{

			.addr = 0x50,

			.flags = 0,

			.len = 1,

			.buf = out_buf,

		},

		{

			.addr = 0x50,

			.flags = I2C_M_RD,

			.len = 1,

			.buf = buf,

		}

	};

	ret = i2c_transfer(&radeon_connector->ddc_bus->adapter, msgs, 2);

	if (ret == 2)

		return true;

	return false;

}

void radeon_i2c_do_lock(struct radeon_i2c_chan *i2c, int lock_state)

{

	struct radeon_device *rdev = i2c->dev->dev_private;

	struct radeon_i2c_bus_rec *rec = &i2c->rec;

	uint32_t temp;

	/* RV410 appears to have a bug where the hw i2c in reset

	 * holds the i2c port in a bad state - switch hw i2c away before

	 * doing DDC - do this for all r200s/r300s/r400s for safety sake

	 */

	if (rec->hw_capable) {

	if ((rdev->family >= CHIP_R200) && !ASIC_IS_AVIVO(rdev)) {

		if (rec->a_clk_reg == RADEON_GPIO_MONID) {

			WREG32(RADEON_DVI_I2C_CNTL_0, (RADEON_I2C_SOFT_RST |

						R200_DVI_I2C_PIN_SEL(R200_SEL_DDC1)));

		} else {

			WREG32(RADEON_DVI_I2C_CNTL_0, (RADEON_I2C_SOFT_RST |

						R200_DVI_I2C_PIN_SEL(R200_SEL_DDC3)));

		}

	}

	}

	/* clear the output pin values */

	temp = RREG32(rec->a_clk_reg) & ~rec->a_clk_mask;

		WREG32(rec->a_clk_reg, temp);

	temp = RREG32(rec->a_data_reg) & ~rec->a_data_mask;

		WREG32(rec->a_data_reg, temp);

	/* set the pins to input */

	temp = RREG32(rec->en_clk_reg) & ~rec->en_clk_mask;

	WREG32(rec->en_clk_reg, temp);

	temp = RREG32(rec->en_data_reg) & ~rec->en_data_mask;

	WREG32(rec->en_data_reg, temp);

	/* mask the gpio pins for software use */

	temp = RREG32(rec->mask_clk_reg);

	if (lock_state)

		temp |= rec->mask_clk_mask;

	else

		temp &= ~rec->mask_clk_mask;

	WREG32(rec->mask_clk_reg, temp);

	temp = RREG32(rec->mask_clk_reg);

	temp = RREG32(rec->mask_data_reg);

	if (lock_state)

		temp |= rec->mask_data_mask;

	else

		temp &= ~rec->mask_data_mask;

	WREG32(rec->mask_data_reg, temp);

	temp = RREG32(rec->mask_data_reg);

}

static int get_clock(void *i2c_priv)

{

	struct radeon_i2c_chan *i2c = i2c_priv;

	struct radeon_device *rdev = i2c->dev->dev_private;

	struct radeon_i2c_bus_rec *rec = &i2c->rec;

	uint32_t val;

	/* read the value off the pin */

	val = RREG32(rec->y_clk_reg);

	val &= rec->y_clk_mask;

	return (val != 0);

}

static int get_data(void *i2c_priv)

{

	struct radeon_i2c_chan *i2c = i2c_priv;

	struct radeon_device *rdev = i2c->dev->dev_private;

	struct radeon_i2c_bus_rec *rec = &i2c->rec;

	uint32_t val;

	/* read the value off the pin */

	val = RREG32(rec->y_data_reg);

	val &= rec->y_data_mask;

	return (val != 0);

}

static void set_clock(void *i2c_priv, int clock)

{

	struct radeon_i2c_chan *i2c = i2c_priv;

	struct radeon_device *rdev = i2c->dev->dev_private;

	struct radeon_i2c_bus_rec *rec = &i2c->rec;

	uint32_t val;

	/* set pin direction */

	val = RREG32(rec->en_clk_reg) & ~rec->en_clk_mask;

	val |= clock ? 0 : rec->en_clk_mask;

	WREG32(rec->en_clk_reg, val);

}

static void set_data(void *i2c_priv, int data)

{

	struct radeon_i2c_chan *i2c = i2c_priv;

	struct radeon_device *rdev = i2c->dev->dev_private;

	struct radeon_i2c_bus_rec *rec = &i2c->rec;

	uint32_t val;

	/* set pin direction */

	val = RREG32(rec->en_data_reg) & ~rec->en_data_mask;

	val |= data ? 0 : rec->en_data_mask;

	WREG32(rec->en_data_reg, val);

}

struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev,

		struct radeon_i2c_bus_rec *rec,

		const char *name)

{

	struct radeon_i2c_chan *i2c;

	int ret;

	i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL);

	if (i2c == NULL)

		return NULL;

	i2c->dev = dev;

	i2c->adapter.algo_data = &i2c->algo.bit;

	i2c->algo.bit.setsda = set_data;

	i2c->algo.bit.setscl = set_clock;

	i2c->algo.bit.getsda = get_data;

	i2c->algo.bit.getscl = get_clock;

	i2c->algo.bit.udelay = 20;

	/* vesa says 2.2 ms is enough, 1 jiffy doesn't seem to always

	 * make this, 2 jiffies is a lot more reliable */

	i2c->algo.bit.timeout = 2;

	i2c->algo.bit.data = i2c;

	i2c->rec = *rec;

	ret = i2c_bit_add_bus(&i2c->adapter);

	if (ret) {

		DRM_INFO("Failed to register i2c %s\n", name);

		goto out_free;

	}

	return i2c;

out_free:

	kfree(i2c);

	return NULL;

}

struct radeon_i2c_chan *radeon_i2c_create_dp(struct drm_device *dev,

					     struct radeon_i2c_bus_rec *rec,

					     const char *name)

{

	struct radeon_i2c_chan *i2c;

	int ret;

	i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL);

	if (i2c == NULL)

		return NULL;

	i2c->rec = *rec;

//   i2c->adapter.owner = THIS_MODULE;

	i2c->dev = dev;

	i2c->adapter.algo_data = &i2c->algo.dp;

	i2c->algo.dp.aux_ch = radeon_dp_i2c_aux_ch;

	i2c->algo.dp.address = 0;

	ret = i2c_dp_aux_add_bus(&i2c->adapter);

	if (ret) {

		DRM_INFO("Failed to register i2c %s\n", name);

		goto out_free;

	}

	return i2c;

out_free:

	kfree(i2c);

	return NULL;

}

void radeon_i2c_destroy(struct radeon_i2c_chan *i2c)

{

	if (!i2c)

		return;

	kfree(i2c);

}

struct drm_encoder *radeon_best_encoder(struct drm_connector *connector)

{

	return NULL;

}

void radeon_i2c_sw_get_byte(struct radeon_i2c_chan *i2c_bus,

			    u8 slave_addr,

			    u8 addr,

			    u8 *val)

{

	u8 out_buf[2];

	u8 in_buf[2];

	struct i2c_msg msgs[] = {

		{

			.addr = slave_addr,

			.flags = 0,

			.len = 1,

			.buf = out_buf,

		},

		{

			.addr = slave_addr,

			.flags = I2C_M_RD,

			.len = 1,

			.buf = in_buf,

		}

	};

	out_buf[0] = addr;

	out_buf[1] = 0;

	if (i2c_transfer(&i2c_bus->adapter, msgs, 2) == 2) {

		*val = in_buf[0];

		DRM_DEBUG("val = 0x%02x\n", *val);

	} else {

		DRM_ERROR("i2c 0x%02x 0x%02x read failed\n",

			  addr, *val);

	}

}

void radeon_i2c_sw_put_byte(struct radeon_i2c_chan *i2c_bus,

			    u8 slave_addr,

			    u8 addr,

			    u8 val)

{

	uint8_t out_buf[2];

	struct i2c_msg msg = {

		.addr = slave_addr,

		.flags = 0,

		.len = 2,

		.buf = out_buf,

	};

	out_buf[0] = addr;

	out_buf[1] = val;

	if (i2c_transfer(&i2c_bus->adapter, &msg, 1) != 1)

		DRM_ERROR("i2c 0x%02x 0x%02x write failed\n",

			  addr, val);

}