/*
 * Copyright 2011 Advanced Micro Devices, 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: Alex Deucher
 */

#include <linux/firmware.h>
#include "drmP.h"
#include "radeon.h"
#include "cikd.h"
#include "ppsmc.h"
#include "radeon_ucode.h"

static int ci_set_smc_sram_address(struct radeon_device *rdev,
				   u32 smc_address, u32 limit)
{
	if (smc_address & 3)
		return -EINVAL;
	if ((smc_address + 3) > limit)
		return -EINVAL;

	WREG32(SMC_IND_INDEX_0, smc_address);
	WREG32_P(SMC_IND_ACCESS_CNTL, 0, ~AUTO_INCREMENT_IND_0);

	return 0;
}

int ci_copy_bytes_to_smc(struct radeon_device *rdev,
			 u32 smc_start_address,
			 const u8 *src, u32 byte_count, u32 limit)
{
	unsigned long flags;
	u32 data, original_data;
	u32 addr;
	u32 extra_shift;
	int ret = 0;

	if (smc_start_address & 3)
		return -EINVAL;
	if ((smc_start_address + byte_count) > limit)
		return -EINVAL;

	addr = smc_start_address;

	spin_lock_irqsave(&rdev->smc_idx_lock, flags);
	while (byte_count >= 4) {
		/* SMC address space is BE */
		data = (src[0] << 24) | (src[1] << 16) | (src[2] << 8) | src[3];

		ret = ci_set_smc_sram_address(rdev, addr, limit);
		if (ret)
			goto done;

		WREG32(SMC_IND_DATA_0, data);

		src += 4;
		byte_count -= 4;
		addr += 4;
	}

	/* RMW for the final bytes */
	if (byte_count > 0) {
		data = 0;

		ret = ci_set_smc_sram_address(rdev, addr, limit);
		if (ret)
			goto done;

		original_data = RREG32(SMC_IND_DATA_0);

		extra_shift = 8 * (4 - byte_count);

		while (byte_count > 0) {
			data = (data << 8) + *src++;
			byte_count--;
		}

		data <<= extra_shift;

		data |= (original_data & ~((~0UL) << extra_shift));

		ret = ci_set_smc_sram_address(rdev, addr, limit);
		if (ret)
			goto done;

		WREG32(SMC_IND_DATA_0, data);
	}

done:
	spin_unlock_irqrestore(&rdev->smc_idx_lock, flags);

	return ret;
}

void ci_start_smc(struct radeon_device *rdev)
{
	u32 tmp = RREG32_SMC(SMC_SYSCON_RESET_CNTL);

	tmp &= ~RST_REG;
	WREG32_SMC(SMC_SYSCON_RESET_CNTL, tmp);
}

void ci_reset_smc(struct radeon_device *rdev)
{
	u32 tmp = RREG32_SMC(SMC_SYSCON_RESET_CNTL);

	tmp |= RST_REG;
	WREG32_SMC(SMC_SYSCON_RESET_CNTL, tmp);
}

int ci_program_jump_on_start(struct radeon_device *rdev)
{
	static u8 data[] = { 0xE0, 0x00, 0x80, 0x40 };

	return ci_copy_bytes_to_smc(rdev, 0x0, data, 4, sizeof(data)+1);
}

void ci_stop_smc_clock(struct radeon_device *rdev)
{
	u32 tmp = RREG32_SMC(SMC_SYSCON_CLOCK_CNTL_0);

	tmp |= CK_DISABLE;

	WREG32_SMC(SMC_SYSCON_CLOCK_CNTL_0, tmp);
}

void ci_start_smc_clock(struct radeon_device *rdev)
{
	u32 tmp = RREG32_SMC(SMC_SYSCON_CLOCK_CNTL_0);

	tmp &= ~CK_DISABLE;

	WREG32_SMC(SMC_SYSCON_CLOCK_CNTL_0, tmp);
}

bool ci_is_smc_running(struct radeon_device *rdev)
{
	u32 clk = RREG32_SMC(SMC_SYSCON_CLOCK_CNTL_0);
	u32 pc_c = RREG32_SMC(SMC_PC_C);

	if (!(clk & CK_DISABLE) && (0x20100 <= pc_c))
		return true;

	return false;
}

PPSMC_Result ci_send_msg_to_smc(struct radeon_device *rdev, PPSMC_Msg msg)
{
	u32 tmp;
	int i;

	if (!ci_is_smc_running(rdev))
		return PPSMC_Result_Failed;

	WREG32(SMC_MESSAGE_0, msg);

	for (i = 0; i < rdev->usec_timeout; i++) {
		tmp = RREG32(SMC_RESP_0);
		if (tmp != 0)
			break;
		udelay(1);
	}
	tmp = RREG32(SMC_RESP_0);

	return (PPSMC_Result)tmp;
}

PPSMC_Result ci_wait_for_smc_inactive(struct radeon_device *rdev)
{
	u32 tmp;
	int i;

	if (!ci_is_smc_running(rdev))
		return PPSMC_Result_OK;

	for (i = 0; i < rdev->usec_timeout; i++) {
                tmp = RREG32_SMC(SMC_SYSCON_CLOCK_CNTL_0);
                if ((tmp & CKEN) == 0)
			break;
                udelay(1);
        }

	return PPSMC_Result_OK;
}

int ci_load_smc_ucode(struct radeon_device *rdev, u32 limit)
{
	unsigned long flags;
	u32 ucode_start_address;
	u32 ucode_size;
	const u8 *src;
	u32 data;

	if (!rdev->smc_fw)
		return -EINVAL;

	switch (rdev->family) {
	case CHIP_BONAIRE:
		ucode_start_address = BONAIRE_SMC_UCODE_START;
		ucode_size = BONAIRE_SMC_UCODE_SIZE;
		break;
	default:
		DRM_ERROR("unknown asic in smc ucode loader\n");
		BUG();
	}

	if (ucode_size & 3)
		return -EINVAL;

	src = (const u8 *)rdev->smc_fw->data;
	spin_lock_irqsave(&rdev->smc_idx_lock, flags);
	WREG32(SMC_IND_INDEX_0, ucode_start_address);
	WREG32_P(SMC_IND_ACCESS_CNTL, AUTO_INCREMENT_IND_0, ~AUTO_INCREMENT_IND_0);
	while (ucode_size >= 4) {
		/* SMC address space is BE */
		data = (src[0] << 24) | (src[1] << 16) | (src[2] << 8) | src[3];

		WREG32(SMC_IND_DATA_0, data);

		src += 4;
		ucode_size -= 4;
	}
	WREG32_P(SMC_IND_ACCESS_CNTL, 0, ~AUTO_INCREMENT_IND_0);
	spin_unlock_irqrestore(&rdev->smc_idx_lock, flags);

	return 0;
}

int ci_read_smc_sram_dword(struct radeon_device *rdev,
			   u32 smc_address, u32 *value, u32 limit)
{
	unsigned long flags;
	int ret;

	spin_lock_irqsave(&rdev->smc_idx_lock, flags);
	ret = ci_set_smc_sram_address(rdev, smc_address, limit);
	if (ret == 0)
		*value = RREG32(SMC_IND_DATA_0);
	spin_unlock_irqrestore(&rdev->smc_idx_lock, flags);

	return ret;
}

int ci_write_smc_sram_dword(struct radeon_device *rdev,
			    u32 smc_address, u32 value, u32 limit)
{
	unsigned long flags;
	int ret;

	spin_lock_irqsave(&rdev->smc_idx_lock, flags);
	ret = ci_set_smc_sram_address(rdev, smc_address, limit);
	if (ret == 0)
		WREG32(SMC_IND_DATA_0, value);
	spin_unlock_irqrestore(&rdev->smc_idx_lock, flags);

	return ret;
}