/*
 * linux/drivers/media/video/s5p-mfc/s5p_mfc_ctrl.c
 *
 * Copyright (c) 2010 Samsung Electronics Co., Ltd.
 *		http://www.samsung.com/
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */

#include <linux/delay.h>
#include <linux/err.h>
#include <linux/firmware.h>
#include <linux/jiffies.h>
#include <linux/sched.h>
#include "regs-mfc.h"
#include "s5p_mfc_cmd.h"
#include "s5p_mfc_common.h"
#include "s5p_mfc_debug.h"
#include "s5p_mfc_intr.h"
#include "s5p_mfc_pm.h"

static void *s5p_mfc_bitproc_buf;
static size_t s5p_mfc_bitproc_phys;
static unsigned char *s5p_mfc_bitproc_virt;

/* Allocate and load firmware */
int s5p_mfc_alloc_and_load_firmware(struct s5p_mfc_dev *dev)
{
	struct firmware *fw_blob;
	size_t bank2_base_phys;
	void *b_base;
	int err;

	/* Firmare has to be present as a separate file or compiled
	 * into kernel. */
	mfc_debug_enter();
	err = request_firmware((const struct firmware **)&fw_blob,
				     "s5p-mfc.fw", dev->v4l2_dev.dev);
	if (err != 0) {
		mfc_err("Firmware is not present in the /lib/firmware directory nor compiled in kernel\n");
		return -EINVAL;
	}
	dev->fw_size = ALIGN(fw_blob->size, FIRMWARE_ALIGN);
	if (s5p_mfc_bitproc_buf) {
		mfc_err("Attempting to allocate firmware when it seems that it is already loaded\n");
		release_firmware(fw_blob);
		return -ENOMEM;
	}
	s5p_mfc_bitproc_buf = vb2_dma_contig_memops.alloc(
		dev->alloc_ctx[MFC_BANK1_ALLOC_CTX], dev->fw_size);
	if (IS_ERR(s5p_mfc_bitproc_buf)) {
		s5p_mfc_bitproc_buf = NULL;
		mfc_err("Allocating bitprocessor buffer failed\n");
		release_firmware(fw_blob);
		return -ENOMEM;
	}
	s5p_mfc_bitproc_phys = s5p_mfc_mem_cookie(
		dev->alloc_ctx[MFC_BANK1_ALLOC_CTX], s5p_mfc_bitproc_buf);
	if (s5p_mfc_bitproc_phys & ((1 << MFC_BASE_ALIGN_ORDER) - 1)) {
		mfc_err("The base memory for bank 1 is not aligned to 128KB\n");
		vb2_dma_contig_memops.put(s5p_mfc_bitproc_buf);
		s5p_mfc_bitproc_phys = 0;
		s5p_mfc_bitproc_buf = NULL;
		release_firmware(fw_blob);
		return -EIO;
	}
	s5p_mfc_bitproc_virt = vb2_dma_contig_memops.vaddr(s5p_mfc_bitproc_buf);
	if (!s5p_mfc_bitproc_virt) {
		mfc_err("Bitprocessor memory remap failed\n");
		vb2_dma_contig_memops.put(s5p_mfc_bitproc_buf);
		s5p_mfc_bitproc_phys = 0;
		s5p_mfc_bitproc_buf = NULL;
		release_firmware(fw_blob);
		return -EIO;
	}
	dev->bank1 = s5p_mfc_bitproc_phys;
	b_base = vb2_dma_contig_memops.alloc(
		dev->alloc_ctx[MFC_BANK2_ALLOC_CTX], 1 << MFC_BANK2_ALIGN_ORDER);
	if (IS_ERR(b_base)) {
		vb2_dma_contig_memops.put(s5p_mfc_bitproc_buf);
		s5p_mfc_bitproc_phys = 0;
		s5p_mfc_bitproc_buf = NULL;
		mfc_err("Allocating bank2 base failed\n");
	release_firmware(fw_blob);
		return -ENOMEM;
	}
	bank2_base_phys = s5p_mfc_mem_cookie(
		dev->alloc_ctx[MFC_BANK2_ALLOC_CTX], b_base);
	vb2_dma_contig_memops.put(b_base);
	if (bank2_base_phys & ((1 << MFC_BASE_ALIGN_ORDER) - 1)) {
		mfc_err("The base memory for bank 2 is not aligned to 128KB\n");
		vb2_dma_contig_memops.put(s5p_mfc_bitproc_buf);
		s5p_mfc_bitproc_phys = 0;
		s5p_mfc_bitproc_buf = NULL;
		release_firmware(fw_blob);
		return -EIO;
	}
	dev->bank2 = bank2_base_phys;
	memcpy(s5p_mfc_bitproc_virt, fw_blob->data, fw_blob->size);
	wmb();
	release_firmware(fw_blob);
	mfc_debug_leave();
	return 0;
}

/* Reload firmware to MFC */
int s5p_mfc_reload_firmware(struct s5p_mfc_dev *dev)
{
	struct firmware *fw_blob;
	int err;

	/* Firmare has to be present as a separate file or compiled
	 * into kernel. */
	mfc_debug_enter();
	err = request_firmware((const struct firmware **)&fw_blob,
				     "s5p-mfc.fw", dev->v4l2_dev.dev);
	if (err != 0) {
		mfc_err("Firmware is not present in the /lib/firmware directory nor compiled in kernel\n");
		return -EINVAL;
	}
	if (fw_blob->size > dev->fw_size) {
		mfc_err("MFC firmware is too big to be loaded\n");
		release_firmware(fw_blob);
		return -ENOMEM;
	}
	if (s5p_mfc_bitproc_buf == NULL || s5p_mfc_bitproc_phys == 0) {
		mfc_err("MFC firmware is not allocated or was not mapped correctly\n");
		release_firmware(fw_blob);
		return -EINVAL;
	}
	memcpy(s5p_mfc_bitproc_virt, fw_blob->data, fw_blob->size);
	wmb();
	release_firmware(fw_blob);
	mfc_debug_leave();
	return 0;
}

/* Release firmware memory */
int s5p_mfc_release_firmware(struct s5p_mfc_dev *dev)
{
	/* Before calling this function one has to make sure
	 * that MFC is no longer processing */
	if (!s5p_mfc_bitproc_buf)
		return -EINVAL;
	vb2_dma_contig_memops.put(s5p_mfc_bitproc_buf);
	s5p_mfc_bitproc_virt = NULL;
	s5p_mfc_bitproc_phys = 0;
	s5p_mfc_bitproc_buf = NULL;
	return 0;
}

/* Reset the device */
int s5p_mfc_reset(struct s5p_mfc_dev *dev)
{
	unsigned int mc_status;
	unsigned long timeout;

	mfc_debug_enter();
	/* Stop procedure */
	/*  reset RISC */
	mfc_write(dev, 0x3f6, S5P_FIMV_SW_RESET);
	/*  All reset except for MC */
	mfc_write(dev, 0x3e2, S5P_FIMV_SW_RESET);
	mdelay(10);

	timeout = jiffies + msecs_to_jiffies(MFC_BW_TIMEOUT);
	/* Check MC status */
	do {
		if (time_after(jiffies, timeout)) {
			mfc_err("Timeout while resetting MFC\n");
			return -EIO;
		}

		mc_status = mfc_read(dev, S5P_FIMV_MC_STATUS);

	} while (mc_status & 0x3);

	mfc_write(dev, 0x0, S5P_FIMV_SW_RESET);
	mfc_write(dev, 0x3fe, S5P_FIMV_SW_RESET);
	mfc_debug_leave();
	return 0;
}

static inline void s5p_mfc_init_memctrl(struct s5p_mfc_dev *dev)
{
	mfc_write(dev, dev->bank1, S5P_FIMV_MC_DRAMBASE_ADR_A);
	mfc_write(dev, dev->bank2, S5P_FIMV_MC_DRAMBASE_ADR_B);
	mfc_debug(2, "Bank1: %08x, Bank2: %08x\n", dev->bank1, dev->bank2);
}

static inline void s5p_mfc_clear_cmds(struct s5p_mfc_dev *dev)
{
	mfc_write(dev, 0xffffffff, S5P_FIMV_SI_CH0_INST_ID);
	mfc_write(dev, 0xffffffff, S5P_FIMV_SI_CH1_INST_ID);
	mfc_write(dev, 0, S5P_FIMV_RISC2HOST_CMD);
	mfc_write(dev, 0, S5P_FIMV_HOST2RISC_CMD);
}

/* Initialize hardware */
int s5p_mfc_init_hw(struct s5p_mfc_dev *dev)
{
	unsigned int ver;
	int ret;

	mfc_debug_enter();
	if (!s5p_mfc_bitproc_buf)
		return -EINVAL;

	/* 0. MFC reset */
	mfc_debug(2, "MFC reset..\n");
	s5p_mfc_clock_on();
	ret = s5p_mfc_reset(dev);
	if (ret) {
		mfc_err("Failed to reset MFC - timeout\n");
		return ret;
	}
	mfc_debug(2, "Done MFC reset..\n");
	/* 1. Set DRAM base Addr */
	s5p_mfc_init_memctrl(dev);
	/* 2. Initialize registers of channel I/F */
	s5p_mfc_clear_cmds(dev);
	/* 3. Release reset signal to the RISC */
	s5p_mfc_clean_dev_int_flags(dev);
	mfc_write(dev, 0x3ff, S5P_FIMV_SW_RESET);
	mfc_debug(2, "Will now wait for completion of firmware transfer\n");
	if (s5p_mfc_wait_for_done_dev(dev, S5P_FIMV_R2H_CMD_FW_STATUS_RET)) {
		mfc_err("Failed to load firmware\n");
		s5p_mfc_reset(dev);
		s5p_mfc_clock_off();
		return -EIO;
	}
	s5p_mfc_clean_dev_int_flags(dev);
	/* 4. Initialize firmware */
	ret = s5p_mfc_sys_init_cmd(dev);
	if (ret) {
		mfc_err("Failed to send command to MFC - timeout\n");
		s5p_mfc_reset(dev);
		s5p_mfc_clock_off();
		return ret;
	}
	mfc_debug(2, "Ok, now will write a command to init the system\n");
	if (s5p_mfc_wait_for_done_dev(dev, S5P_FIMV_R2H_CMD_SYS_INIT_RET)) {
		mfc_err("Failed to load firmware\n");
		s5p_mfc_reset(dev);
		s5p_mfc_clock_off();
		return -EIO;
	}
	dev->int_cond = 0;
	if (dev->int_err != 0 || dev->int_type !=
					S5P_FIMV_R2H_CMD_SYS_INIT_RET) {
		/* Failure. */
		mfc_err("Failed to init firmware - error: %d int: %d\n",
						dev->int_err, dev->int_type);
		s5p_mfc_reset(dev);
		s5p_mfc_clock_off();
		return -EIO;
	}
	ver = mfc_read(dev, S5P_FIMV_FW_VERSION);
	mfc_debug(2, "MFC F/W version : %02xyy, %02xmm, %02xdd\n",
		(ver >> 16) & 0xFF, (ver >> 8) & 0xFF, ver & 0xFF);
	s5p_mfc_clock_off();
	mfc_debug_leave();
	return 0;
}


int s5p_mfc_sleep(struct s5p_mfc_dev *dev)
{
	int ret;

	mfc_debug_enter();
	s5p_mfc_clock_on();
	s5p_mfc_clean_dev_int_flags(dev);
	ret = s5p_mfc_sleep_cmd(dev);
	if (ret) {
		mfc_err("Failed to send command to MFC - timeout\n");
		return ret;
	}
	if (s5p_mfc_wait_for_done_dev(dev, S5P_FIMV_R2H_CMD_SLEEP_RET)) {
		mfc_err("Failed to sleep\n");
		return -EIO;
	}
	s5p_mfc_clock_off();
	dev->int_cond = 0;
	if (dev->int_err != 0 || dev->int_type !=
						S5P_FIMV_R2H_CMD_SLEEP_RET) {
		/* Failure. */
		mfc_err("Failed to sleep - error: %d int: %d\n", dev->int_err,
								dev->int_type);
		return -EIO;
	}
	mfc_debug_leave();
	return ret;
}

int s5p_mfc_wakeup(struct s5p_mfc_dev *dev)
{
	int ret;

	mfc_debug_enter();
	/* 0. MFC reset */
	mfc_debug(2, "MFC reset..\n");
	s5p_mfc_clock_on();
	ret = s5p_mfc_reset(dev);
	if (ret) {
		mfc_err("Failed to reset MFC - timeout\n");
		return ret;
	}
	mfc_debug(2, "Done MFC reset..\n");
	/* 1. Set DRAM base Addr */
	s5p_mfc_init_memctrl(dev);
	/* 2. Initialize registers of channel I/F */
	s5p_mfc_clear_cmds(dev);
	s5p_mfc_clean_dev_int_flags(dev);
	/* 3. Initialize firmware */
	ret = s5p_mfc_wakeup_cmd(dev);
	if (ret) {
		mfc_err("Failed to send command to MFC - timeout\n");
		return ret;
	}
	/* 4. Release reset signal to the RISC */
	mfc_write(dev, 0x3ff, S5P_FIMV_SW_RESET);
	mfc_debug(2, "Ok, now will write a command to wakeup the system\n");
	if (s5p_mfc_wait_for_done_dev(dev, S5P_FIMV_R2H_CMD_WAKEUP_RET)) {
		mfc_err("Failed to load firmware\n");
		return -EIO;
	}
	s5p_mfc_clock_off();
	dev->int_cond = 0;
	if (dev->int_err != 0 || dev->int_type !=
						S5P_FIMV_R2H_CMD_WAKEUP_RET) {
		/* Failure. */
		mfc_err("Failed to wakeup - error: %d int: %d\n", dev->int_err,
								dev->int_type);
		return -EIO;
	}
	mfc_debug_leave();
	return 0;
}