linux/drivers/gpu/drm/i915/gvt/edid.c

/*
 * Copyright(c) 2011-2016 Intel Corporation. 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
 * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS 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:
 *    Ke Yu
 *    Zhiyuan Lv <[email protected]>
 *
 * Contributors:
 *    Terrence Xu <[email protected]>
 *    Changbin Du <[email protected]>
 *    Bing Niu <[email protected]>
 *    Zhi Wang <[email protected]>
 *
 */

#include "display/intel_dp_aux_regs.h"
#include "display/intel_gmbus_regs.h"
#include "gvt.h"
#include "i915_drv.h"
#include "i915_reg.h"

#define GMBUS1_TOTAL_BYTES_SHIFT …
#define GMBUS1_TOTAL_BYTES_MASK …
#define gmbus1_total_byte_count(v) …
#define gmbus1_target_addr(v) …
#define gmbus1_target_index(v) …
#define gmbus1_bus_cycle(v) …

/* GMBUS0 bits definitions */
#define _GMBUS_PIN_SEL_MASK …

static unsigned char edid_get_byte(struct intel_vgpu *vgpu)
{ … }

static inline int cnp_get_port_from_gmbus0(u32 gmbus0)
{ … }

static inline int bxt_get_port_from_gmbus0(u32 gmbus0)
{ … }

static inline int get_port_from_gmbus0(u32 gmbus0)
{ … }

static void reset_gmbus_controller(struct intel_vgpu *vgpu)
{ … }

/* GMBUS0 */
static int gmbus0_mmio_write(struct intel_vgpu *vgpu,
			unsigned int offset, void *p_data, unsigned int bytes)
{ … }

static int gmbus1_mmio_write(struct intel_vgpu *vgpu, unsigned int offset,
		void *p_data, unsigned int bytes)
{ … }

static int gmbus3_mmio_write(struct intel_vgpu *vgpu, unsigned int offset,
	void *p_data, unsigned int bytes)
{ … }

static int gmbus3_mmio_read(struct intel_vgpu *vgpu, unsigned int offset,
		void *p_data, unsigned int bytes)
{ … }

static int gmbus2_mmio_read(struct intel_vgpu *vgpu, unsigned int offset,
		void *p_data, unsigned int bytes)
{ … }

static int gmbus2_mmio_write(struct intel_vgpu *vgpu, unsigned int offset,
		void *p_data, unsigned int bytes)
{ … }

/**
 * intel_gvt_i2c_handle_gmbus_read - emulate gmbus register mmio read
 * @vgpu: a vGPU
 * @offset: reg offset
 * @p_data: data return buffer
 * @bytes: access data length
 *
 * This function is used to emulate gmbus register mmio read
 *
 * Returns:
 * Zero on success, negative error code if failed.
 *
 */
int intel_gvt_i2c_handle_gmbus_read(struct intel_vgpu *vgpu,
	unsigned int offset, void *p_data, unsigned int bytes)
{ … }

/**
 * intel_gvt_i2c_handle_gmbus_write - emulate gmbus register mmio write
 * @vgpu: a vGPU
 * @offset: reg offset
 * @p_data: data return buffer
 * @bytes: access data length
 *
 * This function is used to emulate gmbus register mmio write
 *
 * Returns:
 * Zero on success, negative error code if failed.
 *
 */
int intel_gvt_i2c_handle_gmbus_write(struct intel_vgpu *vgpu,
		unsigned int offset, void *p_data, unsigned int bytes)
{ … }

enum { … };

static inline int get_aux_ch_reg(unsigned int offset)
{ … }

/**
 * intel_gvt_i2c_handle_aux_ch_write - emulate AUX channel register write
 * @vgpu: a vGPU
 * @port_idx: port index
 * @offset: reg offset
 * @p_data: write ptr
 *
 * This function is used to emulate AUX channel register write
 *
 */
void intel_gvt_i2c_handle_aux_ch_write(struct intel_vgpu *vgpu,
				int port_idx,
				unsigned int offset,
				void *p_data)
{ … }

/**
 * intel_vgpu_init_i2c_edid - initialize vGPU i2c edid emulation
 * @vgpu: a vGPU
 *
 * This function is used to initialize vGPU i2c edid emulation stuffs
 *
 */
void intel_vgpu_init_i2c_edid(struct intel_vgpu *vgpu)
{ … }