drivers/host/host.c

// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
/*
 * Copyright (c) 2019 Amlogic, Inc. All rights reserved.
 */

//#define DEBUG
#include <linux/module.h>
#include <linux/device.h>
#include <linux/of_device.h>
#include <linux/slab.h>
#include <linux/cma.h>
#include <linux/dma-mapping.h>
#include <linux/dma-map-ops.h>
#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>
#include <linux/arm-smccc.h>
#include <linux/of.h>
#include <linux/clk.h>
#include <linux/io.h>
#include <linux/kdebug.h>
#include <linux/compat.h>
#include <linux/delay.h>
#include <linux/firmware.h>
#include <linux/of_reserved_mem.h>
#include <linux/of_address.h>
#include <linux/mailbox_client.h>
#include <linux/amlogic/aml_mbox.h>
#include <dt-bindings/firmware/amlogic,firmware.h>
#include "host.h"
#include "sysfs.h"
#include "host_poll.h"

#define		SUSPEND_CLK_FREQ	24000000

/*free reserved memory*/
unsigned long host_free_reserved_area(void *start, void *end, int poison, const char *s)
{
	void *pos;
	unsigned long pages = 0;

	start = (void *)PAGE_ALIGN((unsigned long)start);
	end = (void *)((unsigned long)end & PAGE_MASK);
	for (pos = start; pos < end; pos += PAGE_SIZE, pages++) {
		struct page *page = virt_to_page(pos);
		void *direct_map_addr;

		/*
		 * 'direct_map_addr' might be different from 'pos'
		 * because some architectures' virt_to_page()
		 * work with aliases.  Getting the direct map
		 * address ensures that we get a _writeable_
		 * alias for the memset().
		 */
		direct_map_addr = page_address(page);
		/*
		 * Perform a kasan-unchecked memset() since this memory
		 * has not been initialized.
		 */
		direct_map_addr = kasan_reset_tag(direct_map_addr);
		if ((unsigned int)poison <= 0xFF)
			memset(direct_map_addr, poison, PAGE_SIZE);

		free_reserved_page(page);
	}

	if (pages && s)
		pr_info("Freeing %s memory: %ldK\n",
			s, pages << (PAGE_SHIFT - 10));

	return pages;
}
EXPORT_SYMBOL(host_free_reserved_area);

static int host_dump_memory(const void *buf, unsigned int bytes, int col)
{
	int i = 0, n = 0, size = 0;
	const u8 *pdata;
	char str[256];
	char a_str[24];

	pdata = (u8 *)buf;
	size = bytes;
	memset(a_str, '\0', sizeof(a_str));
	memset(str, '\0', sizeof(str));

	while (n < size) {
		sprintf(a_str, "%p: ", pdata);
		strncat(str, a_str, sizeof(str) - 1);
		col = ((size - n) > col) ? col : (size - n);
		for (i = 0; i < col; i++) {
			sprintf(a_str, "%02x ", *(pdata + i));
			strncat(str, a_str, sizeof(str) - 1);
		}
		pr_debug("%s\n", str);
		memset(str, '\0', sizeof(str));/*re-init buf*/
		pdata += col;
		n += col;
	}

	return 0;
}

static unsigned long host_psci_smc(struct host_module *host)
{
	struct arm_smccc_res res = {0};
	u32 cfg0;
	u32 addr;

	switch (host->start_pos) {
	case PURE_DDR:
		addr = host->phys_ddr_addr;
		break;
	case PURE_SRAM:
		addr = host->phys_sram_addr;
		break;
	case DDR_SRAM:
		addr = host->phys_remap_addr;
		arm_smccc_smc(SMC_REMAP_CMD, host->hostid, addr,
			host->phys_sram_addr, 2, 0, 0, 0, &res);
		break;
	default:
		return 0;
	};
	cfg0 = 0x1 |  1 << 1 | 1 << 2;
	arm_smccc_smc(SMC_BOOT_CMD, host->hostid, addr, cfg0,
		      0, 0, 0, 0, &res);
	return res.a0;
}

static int host_clk_enable(struct host_module *host)
{
	int ret;
	struct device *dev = host->dev;

	ret = clk_set_rate(host->clk, (unsigned long)host->clk_rate * 1000);
	if (ret) {
		dev_err(dev, "Can not set clock rate\n");
		return ret;
	}

	ret = clk_prepare_enable(host->clk);
	if (ret < 0) {
		dev_err(dev, "Can not enable clock\n");
		return ret;
	}

	return 0;
}

static void host_bootup(struct host_module *host)
{
	host_clk_enable(host);
	host_psci_smc(host);
}

static int host_fw_copy_to_memory(const struct firmware *fw,
				 const struct host_module *host,
				 void *fw_dst, const char *name)
{
	host_dump_memory(fw->data, 32, 16);
	host_dump_memory(fw->data + fw->size - 32, 32, 16);
	pr_debug("%s fw_src:0x%p, pdata_dst=0x%p, size=%zu bytes\n",
			__func__, fw->data, fw_dst, fw->size);
	memcpy_toio(fw_dst, fw->data, fw->size);

	/*cache clean*/
	if (!strstr(name, "sram"))
		dma_sync_single_for_device(host->dev,
					   host->phys_ddr_addr,
					   host->phys_ddr_size,
					   DMA_TO_DEVICE);
	pr_debug("\n after copy to ddr and clean cache:\n");
	host_dump_memory(fw_dst, 32, 16);
	host_dump_memory(fw_dst + fw->size - 32, 32, 16);

	return 0;
}

static int firmware_load(struct host_module *host, void *fw_dst, const char *name)
{
	const struct firmware *fw = NULL;
	int err = 0;

	if (IS_ERR_OR_NULL(host))
		return -EINVAL;
	err = request_firmware(&fw, name, host->dev);
	if (err < 0) {
		pr_err("can't load the %s,err=%d\n", name, err);
		return err;
	}

	host_fw_copy_to_memory(fw, host, fw_dst, name);
	release_firmware(fw);
	return 0;
}

static int host_firmware_load(struct host_module *host)
{
	int err = -EINVAL;
	u8 start_pos = host->start_pos;

	switch (start_pos) {
	case PURE_DDR:
		err = firmware_load(host, host->ddr_addr, host->fname0);
		break;
	case PURE_SRAM:
		err = firmware_load(host, host->sram_addr, host->fname1);
		break;
	case DDR_SRAM:
		err = firmware_load(host, host->ddr_addr, host->fname0);
		if (err)
			return err;
		err = firmware_load(host, host->sram_addr, host->fname1);
		if (err)
			return err;
		break;
	default:
		break;
	};
	return err;
}

static void *mm_vmap(phys_addr_t phys, unsigned long size, pgprot_t pgprotattr)
{
	u32 offset, npages;
	struct page **pages = NULL;
	pgprot_t pgprot = pgprotattr;
	void *vaddr;
	int i;

	offset = offset_in_page(phys);
	npages = DIV_ROUND_UP(size + offset, PAGE_SIZE);

	pages = vmalloc(sizeof(struct page *) * npages);
	if (!pages)
		return NULL;
	for (i = 0; i < npages; i++) {
		pages[i] = phys_to_page(phys);
		phys += PAGE_SIZE;
	}

	vaddr = vmap(pages, npages, VM_MAP, pgprot);
	if (!vaddr) {
		pr_err("vmaped fail, size: %d\n",
		       npages << PAGE_SHIFT);
		vfree(pages);
		return NULL;
	}
	vfree(pages);
	pr_debug("[HIGH-MEM-MAP] pa(%lx) to va(%p), size: %d\n",
		 (unsigned long)phys, vaddr, npages << PAGE_SHIFT);

	return vaddr;
}

static int __maybe_unused host_runtime_suspend(struct device *dev)
{
	struct host_module *host = dev_get_drvdata(dev);
	char message[] = "MBOX_CMD_HIFI4STOP";

	if (IS_ERR_OR_NULL(host))
		return -EINVAL;
	if (!host->hang) {
		aml_mbox_transfer_data(host->mbox_chan, MBOX_CMD_HIFI4STOP,
				       message, sizeof(message),
				       NULL, 0, MBOX_SYNC);
		msleep(50);
	}
	clk_disable_unprepare(host->clk);
	host_health_monitor_stop(host);
	host_logbuff_stop(host);
	pr_info("[%s %d]host stop success!\n", __func__, __LINE__);
	return 0;
}

static int __maybe_unused host_runtime_resume(struct device *dev)
{
	struct host_module *host = dev_get_drvdata(dev);
	int ret;

	if (!host->firmware_load) {
		ret = host_firmware_load(host);
		if (ret) {
			dev_err(dev, "Load firmware fail\n");
			return ret;
		}
	}

	host_bootup(host);
	host_health_monitor_start(host);
	host_logbuff_start(host);

	return 0;
}

static int host_suspend(struct device *dev)
{
	struct host_module *host = dev_get_drvdata(dev);
	char message[30];

	if (pm_runtime_suspended(dev))
		return 0;

	if (pm_runtime_active(dev) && host->pm_support) {
		pr_debug("AP send suspend cmd to dsp...\n");
		strncpy(message, "MBOX_CMD_HIFI4SUSPEND", sizeof(message));
		aml_mbox_transfer_data(host->mbox_chan, MBOX_CMD_HIFI4SUSPEND,
				   message, sizeof(message),
				   message, sizeof(message), MBOX_SYNC);
			/*clk = 24 M*/
		clk_set_rate(host->clk, SUSPEND_CLK_FREQ);
	}

	return 0;
}

static int host_resume(struct device *dev)
{
	struct host_module *host = dev_get_drvdata(dev);
	char message[30];

	if (pm_runtime_active(dev) && host->pm_support) {
		pr_debug("AP send resume cmd to dsp...\n");
		/*clk=400 M*/
		clk_set_rate(host->clk, (unsigned long)host->clk_rate * 1000);
		strncpy(message, "MBOX_CMD_HIFI4RESUME", sizeof(message));
		aml_mbox_transfer_data(host->mbox_chan, MBOX_CMD_HIFI4RESUME,
				   message, sizeof(message),
				   message, sizeof(message), MBOX_SYNC);
	}

	return 0;
}

static int host_miscdev_open(struct inode *inode, struct file *fp)
{
	struct miscdevice *misc;
	struct host_module *host;

	misc = fp->private_data;
	host = dev_get_drvdata(misc->this_device);
	fp->private_data = host;

	return 0;
}

static int host_miscdev_release(struct inode *inode, struct file *fp)
{
	return 0;
}

static long host_miscdev_unlocked_ioctl(struct file *fp, unsigned int cmd,
					    unsigned long arg)
{
	struct host_module *host;
	struct device *dev;
	struct host_info_t *usrinfo;
	struct host_shm_info_t shminfo;
	void __user *argp;
	int ret = 0;

	if (!fp->private_data) {
		pr_debug("%s error:fp->private_data is null", __func__);
		ret = -1;
		goto err;
	}
	argp = (void __user *)arg;
	usrinfo = kmalloc(sizeof(*usrinfo), GFP_KERNEL);
	if (!usrinfo) {
		ret = -1;
		goto err;
	}

	host = fp->private_data;
	dev = host->dev;

	switch (cmd) {
	case HOST_LOAD:
		pr_debug("%s HOST_LOAD\n", __func__);
		ret = copy_from_user(usrinfo, argp,
				     sizeof(struct host_info_t));
		if (ret) {
			kfree(usrinfo);
			pr_err("%s error: HOST_LOAD is error", __func__);
			goto err;
		}
		usrinfo->fw_name[31] = '\0';
		strcpy(host->fname0, usrinfo->fw_name);
		host_firmware_load(host);
		host->firmware_load = 1;
	break;
	case HOST_2LOAD:
		pr_debug("%s HOST_2LOAD\n", __func__);
		ret = copy_from_user(usrinfo, argp,
				     sizeof(struct host_info_t));
		if (ret) {
			kfree(usrinfo);
			pr_err("%s error: HOST_2LOAD is error", __func__);
			goto err;
		}
		usrinfo->fw1_name[31] = '\0';
		usrinfo->fw2_name[31] = '\0';
		strcpy(host->fname0, usrinfo->fw1_name);
		strcpy(host->fname1, usrinfo->fw2_name);
		host_firmware_load(host);
		host->firmware_load = 1;
	break;
	case HOST_START:
		pr_debug("%s HOST_START\n", __func__);
		ret = copy_from_user(usrinfo, argp,
				     sizeof(struct host_info_t));
		if (ret) {
			kfree(usrinfo);
			pr_err("%s error: HOST_START is error", __func__);
			goto err;
		}
		pm_runtime_get_sync(dev);
	break;
	case HOST_STOP:
		pr_debug("%s HOST_STOP\n", __func__);
		ret = copy_from_user(usrinfo, argp,
				     sizeof(struct host_info_t));
		if (ret) {
			kfree(usrinfo);
			pr_err("%s error: HOST_STOP is error", __func__);
			goto err;
		}
		pm_runtime_put_sync(dev);
	break;
	case HOST_GET_INFO:
		pr_debug("%s HOST_GET_INFO\n", __func__);
		ret = copy_from_user(usrinfo, argp,
				     sizeof(struct host_info_t));
		if (ret) {
			kfree(usrinfo);
			pr_err("%s error: HOST_GET_INFO copy_from_user is error", __func__);
			goto err;
		}
		strncpy(usrinfo->fw_name, host->host_data->name, sizeof(usrinfo->fw_name));
		usrinfo->phy_addr = host->phys_ddr_addr;
		usrinfo->size = host->phys_ddr_size;
		ret = copy_to_user(argp, usrinfo,
				   sizeof(struct host_info_t));
		if (ret) {
			kfree(usrinfo);
			pr_err("%s error: HOST_GET_INFO copy_to_user is error", __func__);
			goto err;
		}
		pr_debug("%s HOST_GET_INFO %s\n", __func__,
			 usrinfo->fw_name);
	break;
	case HOST_SHM_CLEAN:
		ret = copy_from_user(&shminfo, argp, sizeof(shminfo));
		pr_debug("%s clean cache, addr:%u, size:%u\n",
			 __func__, shminfo.addr, shminfo.size);
		if (ret || shminfo.addr > ((host->phys_ddr_addr +
					host->phys_ddr_size) - host->phys_shm_size) ||
					shminfo.addr < host->phys_ddr_addr ||
					shminfo.size > ((host->phys_ddr_addr +
					host->phys_ddr_size) - host->phys_shm_size -
							shminfo.addr)) {
			kfree(usrinfo);
			pr_err("%s error: HIFI4DSP_SHM_CLEAN is error", __func__);
			goto err;
		}
		dma_sync_single_for_device(host->dev,
					   shminfo.addr,
					   shminfo.size,
					   DMA_TO_DEVICE);
	break;
	case HOST_SHM_INV:
		ret = copy_from_user(&shminfo, argp, sizeof(shminfo));
		pr_debug("%s invalidate cache, addr:%u, size:%u\n",
			 __func__, shminfo.addr, shminfo.size);
		if (ret || shminfo.addr > ((host->phys_ddr_addr +
					host->phys_ddr_size) - host->phys_shm_size) ||
					shminfo.addr < host->phys_ddr_addr ||
					shminfo.size > ((host->phys_ddr_addr +
					host->phys_ddr_size) - host->phys_shm_size -
							shminfo.addr)) {
			kfree(usrinfo);
			pr_err("%s error: HIFI4DSP_SHM_INV is error", __func__);
			goto err;
		}
		dma_sync_single_for_device(host->dev,
					   shminfo.addr,
					   shminfo.size,
					   DMA_FROM_DEVICE);
	break;
	default:
		pr_err("%s ioctl CMD error\n", __func__);
	break;
	}

	kfree(usrinfo);
err:
	return ret;
}

#ifdef CONFIG_COMPAT
static long host_miscdev_compat_ioctl(struct file *filp,
					  unsigned int cmd, unsigned long args)
{
	long ret;

	args = (unsigned long)compat_ptr(args);
	ret = host_miscdev_unlocked_ioctl(filp, cmd, args);

	return ret;
}
#endif

/*shm mmap*/
static int host_miscdev_mmap(struct file *fp, struct vm_area_struct *vma)
{
	int ret = 0;
	unsigned long phys_page_addr = 0;
	unsigned long size = 0;
	struct host_module *host;

	if (!vma) {
		pr_err("input error: vma is NULL\n");
		return -1;
	}

	if (!fp->private_data) {
		pr_err("%s error:fp->private_data is null", __func__);
		return -1;
	}

	host = fp->private_data;

	phys_page_addr = host->phys_ddr_addr >> PAGE_SHIFT;
	size = ((unsigned long)vma->vm_end - (unsigned long)vma->vm_start);
	pr_debug("vma=0x%pK.\n", vma);
	pr_debug("size=%ld, vma->vm_start=%ld, end=%ld.\n",
	       ((unsigned long)vma->vm_end - (unsigned long)vma->vm_start),
	       (unsigned long)vma->vm_start, (unsigned long)vma->vm_end);
	pr_debug("phys_page_addr=%ld.\n", (unsigned long)phys_page_addr);

	vma->vm_page_prot = PAGE_SHARED;
	vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);

	if (size > host->phys_ddr_size)
		size = host->phys_ddr_size;

	ret = remap_pfn_range(vma,
			      vma->vm_start,
			      phys_page_addr, size, vma->vm_page_prot);
	if (ret != 0) {
		pr_err("remap_pfn_range ret=%d\n", ret);
		return -1;
	}

	return ret;
}

static const struct dev_pm_ops host_pm_ops = {
	SET_SYSTEM_SLEEP_PM_OPS(host_suspend,
	host_resume)
	SET_RUNTIME_PM_OPS(host_runtime_suspend,
			   host_runtime_resume, NULL)
};

static const struct file_operations host_miscdev_fops = {
	.owner = THIS_MODULE,
	.open = host_miscdev_open,
	.read = NULL,
	.write = NULL,
	.release = host_miscdev_release,
	.unlocked_ioctl = host_miscdev_unlocked_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl = host_miscdev_compat_ioctl,
#endif
	.mmap = host_miscdev_mmap,
};

static struct miscdevice host_miscdev[] = {
	{
		.minor  = MISC_DYNAMIC_MINOR,
		.name   = "hifi4dsp0",
		.fops   = &host_miscdev_fops,
	},
	{
		.minor  = MISC_DYNAMIC_MINOR,
		.name   = "hifi4dsp1",
		.fops   = &host_miscdev_fops,
	},
	{
		.minor  = MISC_DYNAMIC_MINOR,
		.name   = "mfh0",
		.fops   = &host_miscdev_fops,
	},
	{
		.minor  = MISC_DYNAMIC_MINOR,
		.name   = "mfh1",
		.fops   = &host_miscdev_fops,
	}
};

static struct host_data host_data_table[] = {
	{
		.name = "dspboota",
		.hostid = 0,
		.misc = &host_miscdev[0],
	},
	{
		.name = "dspbootb",
		.hostid = 1,
		.misc = &host_miscdev[1],
	},
	{
		.name = "m4a",
		.hostid = 0,
		.misc = &host_miscdev[2],
	},
	{
		.name = "m4b",
		.hostid = 1,
		.misc = &host_miscdev[3],
	}
};

static const struct of_device_id host_device_id[] = {
	{
		.compatible = "amlogic, hifidsp0",
		.data = &host_data_table[0],
	},
	{
		.compatible = "amlogic, hifidsp1",
		.data = &host_data_table[1],
	},
	{},
};
MODULE_DEVICE_TABLE(of, host_device_id);

void host_parse_firmware_name(struct host_module *host, struct host_data *host_data)
{
	switch (host->start_pos) {
	case PURE_DDR:
		snprintf(host->fname0, HOSTFW_NAME_LEN - 1,
			 "%s_ddr.bin", host_data->name);
		break;
	case PURE_SRAM:
		snprintf(host->fname1, HOSTFW_NAME_LEN - 1,
			 "%s_sram.bin", host_data->name);
		break;
	case DDR_SRAM:
		snprintf(host->fname0, HOSTFW_NAME_LEN - 1,
			 "%s_ddr.bin", host_data->name);
		snprintf(host->fname1, HOSTFW_NAME_LEN - 1,
			 "%s_sram.bin", host_data->name);
		break;
	};
}

static int host_platform_remove(struct platform_device *pdev)
{
	struct host_module *host = platform_get_drvdata(pdev);

	host_destroy_debugfs_files(host);
	host_destroy_device_files(&pdev->dev);
	return 0;
}

static int host_firmware_reserved_ddr(struct platform_device *pdev, struct reserved_mem *fwmem,
						struct host_module *host)
{
	int ret = -1;
	struct device_node *mem_node;
	struct resource res = {0};

	mem_node = of_parse_phandle(pdev->dev.of_node, "memory-region", 0);
	if (!mem_node) {
		ret = -1;
		goto out;
	}
	ret = of_address_to_resource(mem_node, 0, &res);
	of_node_put(mem_node);
	if (ret) {
		dev_err(&pdev->dev, "resource memory init failed\n");
		goto out;
	}
	fwmem->base = res.start;

	/*when dsp is not supported, the reserved memory is released*/
	if (!IS_ERR_OR_NULL(host->dspsup_reg) && (readl(host->dspsup_reg) & DSP_OTP)) {
		dev_err(&pdev->dev, "this device not support dsp\n");
		ret = host_free_reserved_area(__va(res.start), __va(PAGE_ALIGN(res.start +
							resource_size(&res))), 0, "free_reserved");
		if (ret)
			pr_debug("reserved memory  release succeed!\n");
		host_platform_remove(pdev);
	}

out:
	return ret;
}

static int host_parse_devtree(struct platform_device *pdev, struct host_module *host)
{
	struct resource *resource;
	const char *clk_name = NULL;
	struct reserved_mem fwmem;
	struct device *dev = &pdev->dev;
	struct mbox_chan *mbox_chan;
	int ret;

	host->base_reg = devm_platform_ioremap_resource_byname(pdev, "base-reg");
	if (IS_ERR_OR_NULL(host->base_reg))
		dev_err(dev, "Reg base register is error\n");

	host->health_reg = devm_platform_ioremap_resource_byname(pdev, "health-reg");
	if (IS_ERR_OR_NULL(host->health_reg))
		dev_err(dev, "Not support health monitor\n");

	host->dspsup_reg = devm_platform_ioremap_resource_byname(pdev, "dspsupport-reg");
	if (IS_ERR_OR_NULL(host->dspsup_reg))
		dev_err(dev, "Not support dsp\n");
	if (!host_firmware_reserved_ddr(pdev, &fwmem, host)) {
		resource = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ddrfw-region");
		if (!IS_ERR_OR_NULL(resource)) {
			host->phys_ddr_size = resource->end - resource->start + 1;
			host->phys_ddr_addr = fwmem.base + resource->start;
			host->ddr_addr = mm_vmap(host->phys_ddr_addr,
							host->phys_ddr_size,
							pgprot_dmacoherent(PAGE_KERNEL));
		}

		resource = platform_get_resource_byname(pdev, IORESOURCE_MEM, "shm-region");
		if (!IS_ERR_OR_NULL(resource)) {
			host->phys_shm_size = resource->end - resource->start + 1;
			host->phys_shm_addr = fwmem.base + resource->start;
			host->shm_addr = mm_vmap(host->phys_shm_addr,
							host->phys_shm_size,
							pgprot_dmacoherent(PAGE_KERNEL));
		}

		resource = platform_get_resource_byname(pdev, IORESOURCE_MEM, "remap-region");
		if (!IS_ERR_OR_NULL(resource)) {
			host->phys_remap_size = resource->end - resource->start + 1;
			host->phys_remap_addr = resource->start;
		}
	}
	resource = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sram-region");
	if (!IS_ERR_OR_NULL(resource)) {
		host->phys_sram_size = resource->end - resource->start + 1;
		host->phys_sram_addr = resource->start;
		host->sram_addr = devm_ioremap(dev, resource->start,
							host->phys_sram_size);
	}

	if (!of_property_read_string_index(dev->of_node, "clock-names", 0, &clk_name)) {
		host->clk = devm_clk_get(dev, clk_name);
		if (IS_ERR_OR_NULL(host->clk)) {
			dev_err(dev, "can't get clk\n");
		} else {
			ret = of_property_read_u32(dev->of_node, "clkfreq-khz",
						   &host->clk_rate);
			if (ret) {
				dev_err(&pdev->dev, "of get clkfreq-khz failed\n");
				return -EINVAL;
			}
		}
	}

	host->pm_support = of_property_read_bool(dev->of_node, "pm-support");
	/* mbox channel request */
	mbox_chan = aml_mbox_request_channel_byname(&pdev->dev, "init_dsp");
	if (!IS_ERR_OR_NULL(mbox_chan))
		host->init_mbox_chan = mbox_chan;
	host->mbox_chan = aml_mbox_request_channel_byidx(&pdev->dev, 0);
	if (IS_ERR_OR_NULL(host->mbox_chan))
		dev_err(dev, "Not find mailbox channel\n");

	of_property_read_u32(dev->of_node, "logbuff-polling-ms",
			&host->logbuff_polling_ms);
	of_property_read_u32(dev->of_node, "health-polling-ms",
			&host->health_polling_ms);
	ret = of_property_read_u8(dev->of_node, "startup-position", &host->start_pos);
	if (ret) {
		dev_err(dev, "Not find startup-position\n");
		return -EINVAL;
	}

	return 0;
}

static int host_platform_probe(struct platform_device *pdev)
{
	struct device *dev = &pdev->dev;
	struct host_module *host;
	struct host_data *host_data;
	int ret;

	host_data = (struct host_data *)of_device_get_match_data(dev);
	if (IS_ERR_OR_NULL(host_data)) {
		dev_err(&pdev->dev, "failed to get host data\n");
		return -ENODEV;
	}

	host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
	if (IS_ERR_OR_NULL(host))
		return -ENOMEM;

	host->dev = dev;
	host->hostid = host_data->hostid;
	host->misc = host_data->misc;
	host->host_data = host_data;

	ret = host_parse_devtree(pdev, host);
	if (ret)
		return ret;
	host_parse_firmware_name(host, host_data);

	ret = misc_register(host_data->misc);
	if (ret) {
		dev_err(dev, "Misc register fail\n");
		return ret;
	}

	pm_runtime_enable(dev);
	host_create_debugfs_files(host);
	host_create_device_files(&pdev->dev);
	device_init_wakeup(&pdev->dev, 1);
	dev_set_drvdata(host_data->misc->this_device, host);
	platform_set_drvdata(pdev, host);
	return 0;
}

static struct platform_driver host_platform_driver = {
	.driver = {
		.name  = "amlogic_host",
		.owner = THIS_MODULE,
		.of_match_table = of_match_ptr(host_device_id),
		.pm = &host_pm_ops,
	},
	.probe  = host_platform_probe,
	.remove = host_platform_remove,
};
module_platform_driver(host_platform_driver);

MODULE_AUTHOR("Amlogic");
MODULE_DESCRIPTION("Host Module Driver");
MODULE_LICENSE("GPL v2");