drivers/amlogic/mfh/mfh_module.c - manifest_repos/kernel - Git at Google

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

 #define pr_fmt(fmt) "mfh: " fmt

 #include <linux/version.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/string.h>
 #include <linux/io.h>
 #include <linux/fs.h>
 #include <linux/mm.h>
 #include <linux/interrupt.h>
 #include <linux/mutex.h>
 #include <linux/device.h>
 #include <linux/timer.h>
 #include <linux/delay.h>
 #include <linux/slab.h>
 #include <linux/reset.h>
 #include <linux/dma-mapping.h>
 #include <linux/uaccess.h>
 #include <linux/miscdevice.h>
 #include <linux/clk.h>
 #include <asm/cacheflush.h>
 #include <linux/firmware.h>
 #include <linux/arm-smccc.h>
 #include <linux/platform_device.h>
 #include <linux/of_device.h>
 #include <linux/of_reserved_mem.h>
 #include <linux/amlogic/scpi_protocol.h>
 #include <linux/mailbox_client.h>
 #include <linux/spinlock.h>
 #include <linux/pm_runtime.h>
 #include <linux/of_fdt.h>
 #include <linux/pm_domain.h>
 #include <linux/of_reserved_mem.h>
 #include <linux/dma-contiguous.h>
 #include <linux/clk-provider.h>
 #include "mfh_module.h"
 #include "mfh_sysfs.h"

 #define AMLOGIC_MFH_BOOTUP 0x8200004E
 #define AMLOGIC_MFH_BOOT   0x82000097
 #define AMLOGIC_MFH_RESET  0x820000a8
 #define AMLOGIC_M4_BANK    0xFCB87430
 #define PWR_START           1
 #define PWR_STOP            2
 #define PWR_RESET           3

 #define MFH_IOC_MAGIC  'H'
 #define MFH_FIRMWARE_START     _IOWR(MFH_IOC_MAGIC, 1, struct mfh_info)
 #define MFH_CMD_SEND           _IOWR(MFH_IOC_MAGIC, 2, struct mfh_msg_buf)
 #define MFH_CMD_LISTEN         _IOWR(MFH_IOC_MAGIC, 3, struct mfh_msg_buf)
 #define MFH_FIRMWARE_STOP      _IOWR(MFH_IOC_MAGIC, 5, struct mfh_info)
 struct mfh_info {
 	int cpuid;
 	char name[30];
 };

 struct mfh_struct {
 	phys_addr_t base;
 	phys_addr_t size;
 	struct clk *clkm40;
 	struct clk *clkm41;
 	struct clk *clkm4;
 	struct clk *clkm4_pll;
 	struct device *deva;
 	struct device *devb;
 	struct device *p_dev;
 	void __iomem *vaddr;
 	int addr_offset;
 };

 struct mfh_struct mfh_dev;

 static int mfh_startup(struct mfh_struct *mfh_struct,
 			struct mfh_info *mfh_info);

 static int __init mfh_reserve_res_setup(struct reserved_mem *rmem)
 {
 	phys_addr_t align = PAGE_SIZE;
 	phys_addr_t mask = align - 1;

 	if ((rmem->base & mask) || (rmem->size & mask)) {
 		pr_err("Reserved memory: incorrect alignment of region\n");
 		return -EINVAL;
 	}
 	mfh_dev.base = rmem->base;
 	mfh_dev.size = rmem->size;
 	pr_info("Reserved memory: created fb at 0x%p, size %ld KB\n",
 		     (void *)rmem->base, (unsigned long)rmem->size / 1024);
 	return 0;
 }

 RESERVEDMEM_OF_DECLARE(mfh_reserved, "amlogic, aml_mfh_reserve_mem",
 	mfh_reserve_res_setup);

 static void mfh_power_reset(int cpuid, bool power_off)
 {
 	struct arm_smccc_res res = {0};

 	if (power_off)
 		arm_smccc_smc(AMLOGIC_MFH_BOOT, cpuid, 0,
 			0, PWR_STOP, 0, 0, 0, &res);
 	else
 		arm_smccc_smc(AMLOGIC_MFH_BOOT, cpuid, 0,
 			0, PWR_RESET, 0, 0, 0, &res);
 }

 static int mfh_load_firmware(struct mfh_struct *mfh_struct,
 			      struct mfh_info *mfh_info)
 {
 	void __iomem *vaddr = mfh_struct->vaddr;
 	phys_addr_t phy_addr = mfh_struct->base;
 	const struct firmware *firmware;
 	size_t size;
 	int ret = 0;
 	int cpuid = mfh_info->cpuid;

 	ret = request_firmware(&firmware, mfh_info->name, mfh_struct->p_dev);
 	if (ret < 0) {
 		pr_err("req firmware fail %d\n", ret);
 		return ret;
 	}

 	size = firmware->size;
 	if (cpuid == 0) {
 		if (size > mfh_struct->addr_offset) {
 			pr_err("m4a firmware size overflow\n");
 			ret = -ENOMEM;
 			goto fail;
 		}
 	} else if (cpuid == 1) {
 		if (size > mfh_struct->size - mfh_struct->addr_offset) {
 			pr_err("m4b firmware size overflow\n");
 			ret = -ENOMEM;
 			goto fail;
 		}
 		phy_addr += mfh_struct->addr_offset;
 		vaddr += mfh_struct->addr_offset;
 	}

 	memcpy(vaddr, firmware->data, size);
 	dma_sync_single_for_cpu(mfh_struct->p_dev,
 				(dma_addr_t)(phy_addr),
 				size, DMA_FROM_DEVICE);
 fail:
 	release_firmware(firmware);
 	return ret;
 }

 static int mfh_startup(struct mfh_struct *mfh_struct,
 			struct mfh_info *mfh_info)
 {
 	struct arm_smccc_res res = {0};
 	struct clk *clkm4 = mfh_struct->clkm4;
 	struct clk *clkm4_pll = mfh_struct->clkm4_pll;
 	unsigned long pclk_rate = 1200 * 1000 * 1000;
 	unsigned long clk_rate = 300 * 1000 * 1000;
 	phys_addr_t phy_addr = mfh_struct->base;
 	int cpuid = mfh_info->cpuid;
 	struct device *pd_dev = mfh_struct->deva;
 	int ret = 0;

 	pr_debug("mfh id %d\n\n", cpuid);
 	/*set mpll clk, or clkm4 can't set 300M*/
 	if (!IS_ERR_OR_NULL(clkm4_pll)) {
 		if (!__clk_is_enabled(clkm4_pll))
 			clk_set_rate(clkm4_pll, pclk_rate);
 	}
 	if (!__clk_is_enabled(clkm4))
 		clk_set_rate(clkm4, clk_rate);
 	clk_prepare_enable(clkm4);
 	if (cpuid == 1) {
 		pd_dev = mfh_struct->devb;
 		phy_addr += mfh_struct->addr_offset;
 	}
 	/*enable power domain*/
 	ret = pm_runtime_get_sync(pd_dev);
 	arm_smccc_smc(AMLOGIC_MFH_BOOT, cpuid, phy_addr,
 		      AMLOGIC_M4_BANK, PWR_START, 0, 0, 0, &res);
 	return ret;
 }

 static int mfh_stop(struct mfh_struct *mfh_struct,
 		    struct mfh_info *mfh_info)
 {
 	struct clk *clkm4 = mfh_struct->clkm4;
 	struct arm_smccc_res res = {0};
 	int cpuid;
 	int ret = 0;
 	struct device *pd_dev;

 	cpuid = mfh_info->cpuid;
 	arm_smccc_smc(AMLOGIC_MFH_BOOT, cpuid,
 			0, 0, PWR_STOP, 0, 0, 0, &res);
 	clk_disable_unprepare(clkm4);
 	/*disable power domain*/
 	pd_dev = cpuid == 0 ? mfh_struct->deva : mfh_struct->devb;
 	ret = pm_runtime_put_sync(pd_dev);
 	return ret;
 }

 static bool valid_cpuid(int cpuid)
 {
 	return (cpuid == 0 || cpuid == 1);
 }

 static long mfh_miscdev_ioctl(struct file *fp, unsigned int cmd,
 			       unsigned long arg)
 {
 	void __user *argp = (void __user *)arg;
 	struct mfh_struct *mfh_struct = fp->private_data;
 	struct mfh_info mfh_info;
 	int ret = 0;
 	int cpuid = -1;

 	ret = copy_from_user((void *)&mfh_info,
 			argp, sizeof(mfh_info));

 	if (ret < 0)
 		return ret;
 	cpuid = mfh_info.cpuid;
 	if (!valid_cpuid(cpuid)) {
 		pr_err("Invalid cpu id %d\n", cpuid);
 		return -EINVAL;
 	}
 	switch (cmd) {
 	case MFH_FIRMWARE_START:
 		mfh_power_reset(cpuid, PWR_START);
 		ret = mfh_load_firmware(mfh_struct, &mfh_info);
 		if (ret) {
 			pr_err("load firmware error\n");
 			return ret;
 		}
 		mfh_startup(mfh_struct, &mfh_info);
 	break;
 	case MFH_FIRMWARE_STOP:
 		mfh_power_reset(cpuid, PWR_STOP);
 		mfh_stop(mfh_struct, &mfh_info);
 	break;
 	default:
 	break;
 	};
 	return ret;
 }

 static int mfh_miscdev_open(struct inode *node, struct file *file)
 {
 	file->private_data = &mfh_dev;
 	return 0;
 }

 static const struct file_operations mfh_miscdev_fops = {
 	.owner = THIS_MODULE,
 	.open = mfh_miscdev_open,
 	.unlocked_ioctl = mfh_miscdev_ioctl,
 	.compat_ioctl = mfh_miscdev_ioctl,
 };

 static struct miscdevice mfh_miscdev = {
 	.minor	= MISC_DYNAMIC_MINOR,
 	.name	= "mfh",
 	.fops	= &mfh_miscdev_fops,
 };

 static void __iomem *mfh_get_memory(struct device *dev,
 				     struct mfh_struct *mfh_struct)
 {
 	void __iomem *vaddr = NULL;
 	struct page **pages = NULL;
 	u32 npages = DIV_ROUND_UP(mfh_struct->size, PAGE_SIZE);
 	phys_addr_t phys = mfh_struct->base;
 	int i = 0;

 	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_dmacoherent(PAGE_KERNEL));
 	if (!vaddr) {
 		pr_err("vmaped fail, size: %d\n",
 		       npages << PAGE_SHIFT);
 		vfree(pages);
 		return NULL;
 	}

 	vfree(pages);
 	mfh_struct->vaddr = vaddr;
 	of_property_read_u32(dev->of_node, "mfh-addr-offset",
 			     &mfh_struct->addr_offset);
 	pr_debug("Init vaddr %lx physaddr %lx\n",
 		(unsigned long)vaddr, (unsigned long)mfh_struct->base);
 	return vaddr;
 }

 static int mfh_parse_dt(struct device *dev, struct mfh_struct *mfh_struct)
 {
 	const char *clk_name[10] = { "m4_clk0", "m4_clk1", "m4_clk", "m4_pll" };
 	const char *pd_name[10] = { "m4a-core", "m4b-core" };
 	struct device *deva;
 	struct device *devb;
 	void __iomem *vaddr;

 	mfh_struct->clkm40 = of_clk_get_by_name(dev->of_node, clk_name[0]);
 	mfh_struct->clkm41 = of_clk_get_by_name(dev->of_node, clk_name[1]);
 	mfh_struct->clkm4 = of_clk_get_by_name(dev->of_node, clk_name[2]);
 	if (IS_ERR_OR_NULL(mfh_struct->clkm4)) {
 		pr_err("invalid m4 clk\n");
 		return -EINVAL;
 	}
 	mfh_struct->clkm4_pll = of_clk_get_by_name(dev->of_node, clk_name[3]);
 	deva = genpd_dev_pm_attach_by_name(dev, pd_name[0]);
 	if (!deva) {
 		pr_err("power domain a not match\n");
 		return -EINVAL;
 	}
 	deva->parent = mfh_struct->p_dev;
 	devb = genpd_dev_pm_attach_by_name(dev, pd_name[1]);
 	if (!devb) {
 		pr_err("power domain b not match\n");
 		return -EINVAL;
 	}
 	devb->parent = mfh_struct->p_dev;
 	mfh_struct->deva = deva;
 	mfh_struct->devb = devb;
 	vaddr = mfh_get_memory(dev, mfh_struct);
 	if (!vaddr)
 		return -ENOMEM;
 	return 0;
 }

 void mfh_poweron(struct device *dev, int cpuid, bool poweron)
 {
 	struct mfh_struct *mfh_struct = dev_get_drvdata(dev);
 	struct mfh_info mfh_info;

 	if (!valid_cpuid(cpuid)) {
 		pr_err("Invalid cpu id %d\n", cpuid);
 		return;
 	}

 	mfh_info.cpuid = cpuid;
 	if (poweron) {
 		if (cpuid)
 			strncpy(mfh_info.name, "m4b.bin", 30);
 		else
 			strncpy(mfh_info.name, "m4a.bin", 30);
 		mfh_power_reset(cpuid, poweron);
 		mfh_load_firmware(mfh_struct, &mfh_info);
 		mfh_startup(mfh_struct, &mfh_info);
 	} else {
 		mfh_power_reset(cpuid, poweron);
 		mfh_stop(mfh_struct, &mfh_info);
 	}
 }

 static int mfh_platform_probe(struct platform_device *pdev)
 {
 	int ret = 0;
 	struct device *dev = &pdev->dev;

 	mfh_dev.p_dev = dev;
 	ret = mfh_parse_dt(dev, &mfh_dev);
 	if (ret) {
 		pr_info("parse device tree fail\n");
 		return ret;
 	}
 	ret = misc_register(&mfh_miscdev);
 	if (ret) {
 		pr_info("mfh probe fail\n");
 		return ret;
 	}
 	platform_set_drvdata(pdev, &mfh_dev);
 	mfh_dev_create_file(dev);
 	pr_info("mfh probe end\n");
 	return ret;
 }

 static int mfh_platform_remove(struct platform_device *pdev)
 {
 	dev_set_drvdata(mfh_miscdev.this_device, NULL);
 	misc_deregister(&mfh_miscdev);
 	platform_set_drvdata(pdev, NULL);
 	mfh_dev_remove_file(&pdev->dev);
 	return 0;
 }

 static const struct of_device_id mfh_device_id[] = {
 	{
 		.compatible = "amlogic, mfh",
 	},
 	{}
 };

 static struct platform_driver mfh_platform_driver = {
 	.driver = {
 		.name  = "mfh",
 		.owner = THIS_MODULE,
 		.of_match_table = mfh_device_id,
 	},
 	.probe  = mfh_platform_probe,
 	.remove = mfh_platform_remove,
 };
 module_platform_driver(mfh_platform_driver);

 MODULE_AUTHOR("Amlogic M4");
 MODULE_DESCRIPTION("M4 Host Module Driver");
 MODULE_LICENSE("GPL v2");
	// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
	/*
	* Copyright (c) 2019 Amlogic, Inc. All rights reserved.
	*/

	#define pr_fmt(fmt) "mfh: " fmt

	#include <linux/version.h>
	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/types.h>
	#include <linux/string.h>
	#include <linux/io.h>
	#include <linux/fs.h>
	#include <linux/mm.h>
	#include <linux/interrupt.h>
	#include <linux/mutex.h>
	#include <linux/device.h>
	#include <linux/timer.h>
	#include <linux/delay.h>
	#include <linux/slab.h>
	#include <linux/reset.h>
	#include <linux/dma-mapping.h>
	#include <linux/uaccess.h>
	#include <linux/miscdevice.h>
	#include <linux/clk.h>
	#include <asm/cacheflush.h>
	#include <linux/firmware.h>
	#include <linux/arm-smccc.h>
	#include <linux/platform_device.h>
	#include <linux/of_device.h>
	#include <linux/of_reserved_mem.h>
	#include <linux/amlogic/scpi_protocol.h>
	#include <linux/mailbox_client.h>
	#include <linux/spinlock.h>
	#include <linux/pm_runtime.h>
	#include <linux/of_fdt.h>
	#include <linux/pm_domain.h>
	#include <linux/of_reserved_mem.h>
	#include <linux/dma-contiguous.h>
	#include <linux/clk-provider.h>
	#include "mfh_module.h"
	#include "mfh_sysfs.h"

	#define AMLOGIC_MFH_BOOTUP 0x8200004E
	#define AMLOGIC_MFH_BOOT 0x82000097
	#define AMLOGIC_MFH_RESET 0x820000a8
	#define AMLOGIC_M4_BANK 0xFCB87430
	#define PWR_START 1
	#define PWR_STOP 2
	#define PWR_RESET 3

	#define MFH_IOC_MAGIC 'H'
	#define MFH_FIRMWARE_START _IOWR(MFH_IOC_MAGIC, 1, struct mfh_info)
	#define MFH_CMD_SEND _IOWR(MFH_IOC_MAGIC, 2, struct mfh_msg_buf)
	#define MFH_CMD_LISTEN _IOWR(MFH_IOC_MAGIC, 3, struct mfh_msg_buf)
	#define MFH_FIRMWARE_STOP _IOWR(MFH_IOC_MAGIC, 5, struct mfh_info)
	struct mfh_info {
	int cpuid;
	char name[30];
	};

	struct mfh_struct {
	phys_addr_t base;
	phys_addr_t size;
	struct clk *clkm40;
	struct clk *clkm41;
	struct clk *clkm4;
	struct clk *clkm4_pll;
	struct device *deva;
	struct device *devb;
	struct device *p_dev;
	void __iomem *vaddr;
	int addr_offset;
	};

	struct mfh_struct mfh_dev;

	static int mfh_startup(struct mfh_struct *mfh_struct,
	struct mfh_info *mfh_info);

	static int __init mfh_reserve_res_setup(struct reserved_mem *rmem)
	{
	phys_addr_t align = PAGE_SIZE;
	phys_addr_t mask = align - 1;

	if ((rmem->base & mask) \|\| (rmem->size & mask)) {
	pr_err("Reserved memory: incorrect alignment of region\n");
	return -EINVAL;
	}
	mfh_dev.base = rmem->base;
	mfh_dev.size = rmem->size;
	pr_info("Reserved memory: created fb at 0x%p, size %ld KB\n",
	(void *)rmem->base, (unsigned long)rmem->size / 1024);
	return 0;
	}

	RESERVEDMEM_OF_DECLARE(mfh_reserved, "amlogic, aml_mfh_reserve_mem",
	mfh_reserve_res_setup);

	static void mfh_power_reset(int cpuid, bool power_off)
	{
	struct arm_smccc_res res = {0};

	if (power_off)
	arm_smccc_smc(AMLOGIC_MFH_BOOT, cpuid, 0,
	0, PWR_STOP, 0, 0, 0, &res);
	else
	arm_smccc_smc(AMLOGIC_MFH_BOOT, cpuid, 0,
	0, PWR_RESET, 0, 0, 0, &res);
	}

	static int mfh_load_firmware(struct mfh_struct *mfh_struct,
	struct mfh_info *mfh_info)
	{
	void __iomem *vaddr = mfh_struct->vaddr;
	phys_addr_t phy_addr = mfh_struct->base;
	const struct firmware *firmware;
	size_t size;
	int ret = 0;
	int cpuid = mfh_info->cpuid;

	ret = request_firmware(&firmware, mfh_info->name, mfh_struct->p_dev);
	if (ret < 0) {
	pr_err("req firmware fail %d\n", ret);
	return ret;
	}

	size = firmware->size;
	if (cpuid == 0) {
	if (size > mfh_struct->addr_offset) {
	pr_err("m4a firmware size overflow\n");
	ret = -ENOMEM;
	goto fail;
	}
	} else if (cpuid == 1) {
	if (size > mfh_struct->size - mfh_struct->addr_offset) {
	pr_err("m4b firmware size overflow\n");
	ret = -ENOMEM;
	goto fail;
	}
	phy_addr += mfh_struct->addr_offset;
	vaddr += mfh_struct->addr_offset;
	}

	memcpy(vaddr, firmware->data, size);
	dma_sync_single_for_cpu(mfh_struct->p_dev,
	(dma_addr_t)(phy_addr),
	size, DMA_FROM_DEVICE);
	fail:
	release_firmware(firmware);
	return ret;
	}

	static int mfh_startup(struct mfh_struct *mfh_struct,
	struct mfh_info *mfh_info)
	{
	struct arm_smccc_res res = {0};
	struct clk *clkm4 = mfh_struct->clkm4;
	struct clk *clkm4_pll = mfh_struct->clkm4_pll;
	unsigned long pclk_rate = 1200 * 1000 * 1000;
	unsigned long clk_rate = 300 * 1000 * 1000;
	phys_addr_t phy_addr = mfh_struct->base;
	int cpuid = mfh_info->cpuid;
	struct device *pd_dev = mfh_struct->deva;
	int ret = 0;

	pr_debug("mfh id %d\n\n", cpuid);
	/set mpll clk, or clkm4 can't set 300M/
	if (!IS_ERR_OR_NULL(clkm4_pll)) {
	if (!__clk_is_enabled(clkm4_pll))
	clk_set_rate(clkm4_pll, pclk_rate);
	}
	if (!__clk_is_enabled(clkm4))
	clk_set_rate(clkm4, clk_rate);
	clk_prepare_enable(clkm4);
	if (cpuid == 1) {
	pd_dev = mfh_struct->devb;
	phy_addr += mfh_struct->addr_offset;
	}
	/enable power domain/
	ret = pm_runtime_get_sync(pd_dev);
	arm_smccc_smc(AMLOGIC_MFH_BOOT, cpuid, phy_addr,
	AMLOGIC_M4_BANK, PWR_START, 0, 0, 0, &res);
	return ret;
	}

	static int mfh_stop(struct mfh_struct *mfh_struct,
	struct mfh_info *mfh_info)
	{
	struct clk *clkm4 = mfh_struct->clkm4;
	struct arm_smccc_res res = {0};
	int cpuid;
	int ret = 0;
	struct device *pd_dev;

	cpuid = mfh_info->cpuid;
	arm_smccc_smc(AMLOGIC_MFH_BOOT, cpuid,
	0, 0, PWR_STOP, 0, 0, 0, &res);
	clk_disable_unprepare(clkm4);
	/disable power domain/
	pd_dev = cpuid == 0 ? mfh_struct->deva : mfh_struct->devb;
	ret = pm_runtime_put_sync(pd_dev);
	return ret;
	}

	static bool valid_cpuid(int cpuid)
	{
	return (cpuid == 0 \|\| cpuid == 1);
	}

	static long mfh_miscdev_ioctl(struct file *fp, unsigned int cmd,
	unsigned long arg)
	{
	void __user argp = (void __user )arg;
	struct mfh_struct *mfh_struct = fp->private_data;
	struct mfh_info mfh_info;
	int ret = 0;
	int cpuid = -1;

	ret = copy_from_user((void *)&mfh_info,
	argp, sizeof(mfh_info));

	if (ret < 0)
	return ret;
	cpuid = mfh_info.cpuid;
	if (!valid_cpuid(cpuid)) {
	pr_err("Invalid cpu id %d\n", cpuid);
	return -EINVAL;
	}
	switch (cmd) {
	case MFH_FIRMWARE_START:
	mfh_power_reset(cpuid, PWR_START);
	ret = mfh_load_firmware(mfh_struct, &mfh_info);
	if (ret) {
	pr_err("load firmware error\n");
	return ret;
	}
	mfh_startup(mfh_struct, &mfh_info);
	break;
	case MFH_FIRMWARE_STOP:
	mfh_power_reset(cpuid, PWR_STOP);
	mfh_stop(mfh_struct, &mfh_info);
	break;
	default:
	break;
	};
	return ret;
	}

	static int mfh_miscdev_open(struct inode node, struct file file)
	{
	file->private_data = &mfh_dev;
	return 0;
	}

	static const struct file_operations mfh_miscdev_fops = {
	.owner = THIS_MODULE,
	.open = mfh_miscdev_open,
	.unlocked_ioctl = mfh_miscdev_ioctl,
	.compat_ioctl = mfh_miscdev_ioctl,
	};

	static struct miscdevice mfh_miscdev = {
	.minor = MISC_DYNAMIC_MINOR,
	.name = "mfh",
	.fops = &mfh_miscdev_fops,
	};

	static void __iomem mfh_get_memory(struct device dev,
	struct mfh_struct *mfh_struct)
	{
	void __iomem *vaddr = NULL;
	struct page **pages = NULL;
	u32 npages = DIV_ROUND_UP(mfh_struct->size, PAGE_SIZE);
	phys_addr_t phys = mfh_struct->base;
	int i = 0;

	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_dmacoherent(PAGE_KERNEL));
	if (!vaddr) {
	pr_err("vmaped fail, size: %d\n",
	npages << PAGE_SHIFT);
	vfree(pages);
	return NULL;
	}

	vfree(pages);
	mfh_struct->vaddr = vaddr;
	of_property_read_u32(dev->of_node, "mfh-addr-offset",
	&mfh_struct->addr_offset);
	pr_debug("Init vaddr %lx physaddr %lx\n",
	(unsigned long)vaddr, (unsigned long)mfh_struct->base);
	return vaddr;
	}

	static int mfh_parse_dt(struct device dev, struct mfh_struct mfh_struct)
	{
	const char *clk_name[10] = { "m4_clk0", "m4_clk1", "m4_clk", "m4_pll" };
	const char *pd_name[10] = { "m4a-core", "m4b-core" };
	struct device *deva;
	struct device *devb;
	void __iomem *vaddr;

	mfh_struct->clkm40 = of_clk_get_by_name(dev->of_node, clk_name[0]);
	mfh_struct->clkm41 = of_clk_get_by_name(dev->of_node, clk_name[1]);
	mfh_struct->clkm4 = of_clk_get_by_name(dev->of_node, clk_name[2]);
	if (IS_ERR_OR_NULL(mfh_struct->clkm4)) {
	pr_err("invalid m4 clk\n");
	return -EINVAL;
	}
	mfh_struct->clkm4_pll = of_clk_get_by_name(dev->of_node, clk_name[3]);
	deva = genpd_dev_pm_attach_by_name(dev, pd_name[0]);
	if (!deva) {
	pr_err("power domain a not match\n");
	return -EINVAL;
	}
	deva->parent = mfh_struct->p_dev;
	devb = genpd_dev_pm_attach_by_name(dev, pd_name[1]);
	if (!devb) {
	pr_err("power domain b not match\n");
	return -EINVAL;
	}
	devb->parent = mfh_struct->p_dev;
	mfh_struct->deva = deva;
	mfh_struct->devb = devb;
	vaddr = mfh_get_memory(dev, mfh_struct);
	if (!vaddr)
	return -ENOMEM;
	return 0;
	}

	void mfh_poweron(struct device *dev, int cpuid, bool poweron)
	{
	struct mfh_struct *mfh_struct = dev_get_drvdata(dev);
	struct mfh_info mfh_info;

	if (!valid_cpuid(cpuid)) {
	pr_err("Invalid cpu id %d\n", cpuid);
	return;
	}

	mfh_info.cpuid = cpuid;
	if (poweron) {
	if (cpuid)
	strncpy(mfh_info.name, "m4b.bin", 30);
	else
	strncpy(mfh_info.name, "m4a.bin", 30);
	mfh_power_reset(cpuid, poweron);
	mfh_load_firmware(mfh_struct, &mfh_info);
	mfh_startup(mfh_struct, &mfh_info);
	} else {
	mfh_power_reset(cpuid, poweron);
	mfh_stop(mfh_struct, &mfh_info);
	}
	}

	static int mfh_platform_probe(struct platform_device *pdev)
	{
	int ret = 0;
	struct device *dev = &pdev->dev;

	mfh_dev.p_dev = dev;
	ret = mfh_parse_dt(dev, &mfh_dev);
	if (ret) {
	pr_info("parse device tree fail\n");
	return ret;
	}
	ret = misc_register(&mfh_miscdev);
	if (ret) {
	pr_info("mfh probe fail\n");
	return ret;
	}
	platform_set_drvdata(pdev, &mfh_dev);
	mfh_dev_create_file(dev);
	pr_info("mfh probe end\n");
	return ret;
	}

	static int mfh_platform_remove(struct platform_device *pdev)
	{
	dev_set_drvdata(mfh_miscdev.this_device, NULL);
	misc_deregister(&mfh_miscdev);
	platform_set_drvdata(pdev, NULL);
	mfh_dev_remove_file(&pdev->dev);
	return 0;
	}

	static const struct of_device_id mfh_device_id[] = {
	{
	.compatible = "amlogic, mfh",
	},
	{}
	};

	static struct platform_driver mfh_platform_driver = {
	.driver = {
	.name = "mfh",
	.owner = THIS_MODULE,
	.of_match_table = mfh_device_id,
	},
	.probe = mfh_platform_probe,
	.remove = mfh_platform_remove,
	};
	module_platform_driver(mfh_platform_driver);

	MODULE_AUTHOR("Amlogic M4");
	MODULE_DESCRIPTION("M4 Host Module Driver");
	MODULE_LICENSE("GPL v2");