/*
 * skl-sst.c - HDA DSP library functions for SKL platform
 *
 * Copyright (C) 2014-15, Intel Corporation.
 * Author:Rafal Redzimski <rafal.f.redzimski@intel.com>
 *	Jeeja KP <jeeja.kp@intel.com>
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as version 2, as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 */

#include <linux/module.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/err.h>
#include "../common/sst-dsp.h"
#include "../common/sst-dsp-priv.h"
#include "../common/sst-ipc.h"
#include "skl-sst-ipc.h"

#define SKL_BASEFW_TIMEOUT	300
#define SKL_INIT_TIMEOUT	1000

/* Intel HD Audio SRAM Window 0*/
#define SKL_ADSP_SRAM0_BASE	0x8000

/* Firmware status window */
#define SKL_ADSP_FW_STATUS	SKL_ADSP_SRAM0_BASE
#define SKL_ADSP_ERROR_CODE	(SKL_ADSP_FW_STATUS + 0x4)

#define SKL_INSTANCE_ID		0
#define SKL_BASE_FW_MODULE_ID	0

#define SKL_NUM_MODULES		1

static bool skl_check_fw_status(struct sst_dsp *ctx, u32 status)
{
	u32 cur_sts;

	cur_sts = sst_dsp_shim_read(ctx, SKL_ADSP_FW_STATUS) & SKL_FW_STS_MASK;

	return (cur_sts == status);
}

static int skl_transfer_firmware(struct sst_dsp *ctx,
		const void *basefw, u32 base_fw_size)
{
	int ret = 0;

	ret = ctx->cl_dev.ops.cl_copy_to_dmabuf(ctx, basefw, base_fw_size);
	if (ret < 0)
		return ret;

	ret = sst_dsp_register_poll(ctx,
			SKL_ADSP_FW_STATUS,
			SKL_FW_STS_MASK,
			SKL_FW_RFW_START,
			SKL_BASEFW_TIMEOUT,
			"Firmware boot");

	ctx->cl_dev.ops.cl_stop_dma(ctx);

	return ret;
}

static int skl_load_base_firmware(struct sst_dsp *ctx)
{
	int ret = 0, i;
	struct skl_sst *skl = ctx->thread_context;
	u32 reg;

	skl->boot_complete = false;
	init_waitqueue_head(&skl->boot_wait);

	if (ctx->fw == NULL) {
		ret = reject_firmware(&ctx->fw, ctx->fw_name, ctx->dev);
		if (ret < 0) {
			dev_err(ctx->dev, "Request firmware failed %d\n", ret);
			skl_dsp_disable_core(ctx);
			return -EIO;
		}
	}

	ret = skl_dsp_boot(ctx);
	if (ret < 0) {
		dev_err(ctx->dev, "Boot dsp core failed ret: %d", ret);
		goto skl_load_base_firmware_failed;
	}

	ret = skl_cldma_prepare(ctx);
	if (ret < 0) {
		dev_err(ctx->dev, "CL dma prepare failed : %d", ret);
		goto skl_load_base_firmware_failed;
	}

	/* enable Interrupt */
	skl_ipc_int_enable(ctx);
	skl_ipc_op_int_enable(ctx);

	/* check ROM Status */
	for (i = SKL_INIT_TIMEOUT; i > 0; --i) {
		if (skl_check_fw_status(ctx, SKL_FW_INIT)) {
			dev_dbg(ctx->dev,
				"ROM loaded, we can continue with FW loading\n");
			break;
		}
		mdelay(1);
	}
	if (!i) {
		reg = sst_dsp_shim_read(ctx, SKL_ADSP_FW_STATUS);
		dev_err(ctx->dev,
			"Timeout waiting for ROM init done, reg:0x%x\n", reg);
		ret = -EIO;
		goto transfer_firmware_failed;
	}

	ret = skl_transfer_firmware(ctx, ctx->fw->data, ctx->fw->size);
	if (ret < 0) {
		dev_err(ctx->dev, "Transfer firmware failed%d\n", ret);
		goto transfer_firmware_failed;
	} else {
		ret = wait_event_timeout(skl->boot_wait, skl->boot_complete,
					msecs_to_jiffies(SKL_IPC_BOOT_MSECS));
		if (ret == 0) {
			dev_err(ctx->dev, "DSP boot failed, FW Ready timed-out\n");
			ret = -EIO;
			goto transfer_firmware_failed;
		}

		dev_dbg(ctx->dev, "Download firmware successful%d\n", ret);
		skl_dsp_set_state_locked(ctx, SKL_DSP_RUNNING);
	}
	return 0;
transfer_firmware_failed:
	ctx->cl_dev.ops.cl_cleanup_controller(ctx);
skl_load_base_firmware_failed:
	skl_dsp_disable_core(ctx);
	release_firmware(ctx->fw);
	ctx->fw = NULL;
	return ret;
}

static int skl_set_dsp_D0(struct sst_dsp *ctx)
{
	int ret;

	ret = skl_load_base_firmware(ctx);
	if (ret < 0) {
		dev_err(ctx->dev, "unable to load firmware\n");
		return ret;
	}

	skl_dsp_set_state_locked(ctx, SKL_DSP_RUNNING);

	return ret;
}

static int skl_set_dsp_D3(struct sst_dsp *ctx)
{
	int ret;
	struct skl_ipc_dxstate_info dx;
	struct skl_sst *skl = ctx->thread_context;

	dev_dbg(ctx->dev, "In %s:\n", __func__);
	mutex_lock(&ctx->mutex);
	if (!is_skl_dsp_running(ctx)) {
		mutex_unlock(&ctx->mutex);
		return 0;
	}
	mutex_unlock(&ctx->mutex);

	dx.core_mask = SKL_DSP_CORE0_MASK;
	dx.dx_mask = SKL_IPC_D3_MASK;
	ret = skl_ipc_set_dx(&skl->ipc, SKL_INSTANCE_ID, SKL_BASE_FW_MODULE_ID, &dx);
	if (ret < 0)
		dev_err(ctx->dev,
			"D3 request to FW failed, continuing reset: %d", ret);

	/* disable Interrupt */
	ctx->cl_dev.ops.cl_cleanup_controller(ctx);
	skl_cldma_int_disable(ctx);
	skl_ipc_op_int_disable(ctx);
	skl_ipc_int_disable(ctx);

	ret = skl_dsp_disable_core(ctx);
	if (ret < 0) {
		dev_err(ctx->dev, "disable dsp core failed ret: %d\n", ret);
		ret = -EIO;
	}
	skl_dsp_set_state_locked(ctx, SKL_DSP_RESET);

	return ret;
}

static unsigned int skl_get_errorcode(struct sst_dsp *ctx)
{
	 return sst_dsp_shim_read(ctx, SKL_ADSP_ERROR_CODE);
}

/*
 * since get/set_module are called from DAPM context,
 * we don't need lock for usage count
 */
static int skl_get_module(struct sst_dsp *ctx, u16 mod_id)
{
	struct skl_module_table *module;

	list_for_each_entry(module, &ctx->module_list, list) {
		if (module->mod_info->mod_id == mod_id)
			return ++module->usage_cnt;
	}

	return -EINVAL;
}

static int skl_put_module(struct sst_dsp *ctx, u16 mod_id)
{
	struct skl_module_table *module;

	list_for_each_entry(module, &ctx->module_list, list) {
		if (module->mod_info->mod_id == mod_id)
			return --module->usage_cnt;
	}

	return -EINVAL;
}

static struct skl_module_table *skl_fill_module_table(struct sst_dsp *ctx,
						char *mod_name, int mod_id)
{
	const struct firmware *fw;
	struct skl_module_table *skl_module;
	unsigned int size;
	int ret;

	ret = reject_firmware(&fw, mod_name, ctx->dev);
	if (ret < 0) {
		dev_err(ctx->dev, "Request Module %s failed :%d\n",
							mod_name, ret);
		return NULL;
	}

	skl_module = devm_kzalloc(ctx->dev, sizeof(*skl_module), GFP_KERNEL);
	if (skl_module == NULL) {
		release_firmware(fw);
		return NULL;
	}

	size = sizeof(*skl_module->mod_info);
	skl_module->mod_info = devm_kzalloc(ctx->dev, size, GFP_KERNEL);
	if (skl_module->mod_info == NULL) {
		release_firmware(fw);
		return NULL;
	}

	skl_module->mod_info->mod_id = mod_id;
	skl_module->mod_info->fw = fw;
	list_add(&skl_module->list, &ctx->module_list);

	return skl_module;
}

/* get a module from it's unique ID */
static struct skl_module_table *skl_module_get_from_id(
			struct sst_dsp *ctx, u16 mod_id)
{
	struct skl_module_table *module;

	if (list_empty(&ctx->module_list)) {
		dev_err(ctx->dev, "Module list is empty\n");
		return NULL;
	}

	list_for_each_entry(module, &ctx->module_list, list) {
		if (module->mod_info->mod_id == mod_id)
			return module;
	}

	return NULL;
}

static int skl_transfer_module(struct sst_dsp *ctx,
			struct skl_load_module_info *module)
{
	int ret;
	struct skl_sst *skl = ctx->thread_context;

	ret = ctx->cl_dev.ops.cl_copy_to_dmabuf(ctx, module->fw->data,
							module->fw->size);
	if (ret < 0)
		return ret;

	ret = skl_ipc_load_modules(&skl->ipc, SKL_NUM_MODULES,
						(void *)&module->mod_id);
	if (ret < 0)
		dev_err(ctx->dev, "Failed to Load module: %d\n", ret);

	ctx->cl_dev.ops.cl_stop_dma(ctx);

	return ret;
}

static int skl_load_module(struct sst_dsp *ctx, u16 mod_id, char *guid)
{
	struct skl_module_table *module_entry = NULL;
	int ret = 0;
	char mod_name[64]; /* guid str = 32 chars + 4 hyphens */

	snprintf(mod_name, sizeof(mod_name), "/*(DEBLOBBED)*/");

	module_entry = skl_module_get_from_id(ctx, mod_id);
	if (module_entry == NULL) {
		module_entry = skl_fill_module_table(ctx, mod_name, mod_id);
		if (module_entry == NULL) {
			dev_err(ctx->dev, "Failed to Load module\n");
			return -EINVAL;
		}
	}

	if (!module_entry->usage_cnt) {
		ret = skl_transfer_module(ctx, module_entry->mod_info);
		if (ret < 0) {
			dev_err(ctx->dev, "Failed to Load module\n");
			return ret;
		}
	}

	ret = skl_get_module(ctx, mod_id);

	return ret;
}

static int skl_unload_module(struct sst_dsp *ctx, u16 mod_id)
{
	int usage_cnt;
	struct skl_sst *skl = ctx->thread_context;
	int ret = 0;

	usage_cnt = skl_put_module(ctx, mod_id);
	if (usage_cnt < 0) {
		dev_err(ctx->dev, "Module bad usage cnt!:%d\n", usage_cnt);
		return -EIO;
	}
	ret = skl_ipc_unload_modules(&skl->ipc,
			SKL_NUM_MODULES, &mod_id);
	if (ret < 0) {
		dev_err(ctx->dev, "Failed to UnLoad module\n");
		skl_get_module(ctx, mod_id);
		return ret;
	}

	return ret;
}

static void skl_clear_module_table(struct sst_dsp *ctx)
{
	struct skl_module_table *module, *tmp;

	if (list_empty(&ctx->module_list))
		return;

	list_for_each_entry_safe(module, tmp, &ctx->module_list, list) {
		list_del(&module->list);
		release_firmware(module->mod_info->fw);
	}
}

static struct skl_dsp_fw_ops skl_fw_ops = {
	.set_state_D0 = skl_set_dsp_D0,
	.set_state_D3 = skl_set_dsp_D3,
	.load_fw = skl_load_base_firmware,
	.get_fw_errcode = skl_get_errorcode,
	.load_mod = skl_load_module,
	.unload_mod = skl_unload_module,
};

static struct sst_ops skl_ops = {
	.irq_handler = skl_dsp_sst_interrupt,
	.write = sst_shim32_write,
	.read = sst_shim32_read,
	.ram_read = sst_memcpy_fromio_32,
	.ram_write = sst_memcpy_toio_32,
	.free = skl_dsp_free,
};

static struct sst_dsp_device skl_dev = {
	.thread = skl_dsp_irq_thread_handler,
	.ops = &skl_ops,
};

int skl_sst_dsp_init(struct device *dev, void __iomem *mmio_base, int irq,
		const char *fw_name, struct skl_dsp_loader_ops dsp_ops, struct skl_sst **dsp)
{
	struct skl_sst *skl;
	struct sst_dsp *sst;
	int ret;

	skl = devm_kzalloc(dev, sizeof(*skl), GFP_KERNEL);
	if (skl == NULL)
		return -ENOMEM;

	skl->dev = dev;
	skl_dev.thread_context = skl;

	skl->dsp = skl_dsp_ctx_init(dev, &skl_dev, irq);
	if (!skl->dsp) {
		dev_err(skl->dev, "%s: no device\n", __func__);
		return -ENODEV;
	}

	sst = skl->dsp;

	sst->fw_name = fw_name;
	sst->addr.lpe = mmio_base;
	sst->addr.shim = mmio_base;
	sst_dsp_mailbox_init(sst, (SKL_ADSP_SRAM0_BASE + SKL_ADSP_W0_STAT_SZ),
			SKL_ADSP_W0_UP_SZ, SKL_ADSP_SRAM1_BASE, SKL_ADSP_W1_SZ);

	INIT_LIST_HEAD(&sst->module_list);
	sst->dsp_ops = dsp_ops;
	sst->fw_ops = skl_fw_ops;

	ret = skl_ipc_init(dev, skl);
	if (ret)
		return ret;

	ret = sst->fw_ops.load_fw(sst);
	if (ret < 0) {
		dev_err(dev, "Load base fw failed : %d", ret);
		goto cleanup;
	}

	if (dsp)
		*dsp = skl;

	return ret;

cleanup:
	skl_sst_dsp_cleanup(dev, skl);
	return ret;
}
EXPORT_SYMBOL_GPL(skl_sst_dsp_init);

void skl_sst_dsp_cleanup(struct device *dev, struct skl_sst *ctx)
{
	skl_clear_module_table(ctx->dsp);
	skl_ipc_free(&ctx->ipc);
	ctx->dsp->ops->free(ctx->dsp);
}
EXPORT_SYMBOL_GPL(skl_sst_dsp_cleanup);

MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("Intel Skylake IPC driver");