xref: /OK3568_Linux_fs/kernel/drivers/soc/rockchip/rockchip_thunderboot_sfc.c (revision 4882a59341e53eb6f0b4789bf948001014eff981)

// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (C) 2020 Rockchip Electronics Co., Ltd.
 */
#include <linux/iopoll.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/soc/rockchip/rockchip_decompress.h>
#include <linux/soc/rockchip/rockchip_thunderboot_crypto.h>

#define SFC_ICLR	0x08
#define SFC_SR		0x24
#define SFC_RAWISR	0x28

/* SFC_SR Register */
#define SFC_BUSY	BIT(0)

/* SFC_RAWISR Register */
#define DMA_INT		BIT(7)

static int rk_tb_sfc_thread(void *p)
{
	int ret = 0;
	struct platform_device *pdev = p;
	void __iomem *regs;
	struct resource *res;
	struct device_node *rds, *rdd;
	struct device *dev = &pdev->dev;
	u32 status;

	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
	regs = ioremap(res->start, resource_size(res));
	if (!regs) {
		dev_err(dev, "ioremap failed for resource %pR\n", res);
		return -ENOMEM;
	}

	rds = of_parse_phandle(dev->of_node, "memory-region-src", 0);
	rdd = of_parse_phandle(dev->of_node, "memory-region-dst", 0);

#ifdef SFC_DEBUG
	print_hex_dump(KERN_WARNING, "tb_sfc", DUMP_PREFIX_OFFSET, 4, 4, regs, 0x60, 0);
#endif

	ret = readl_poll_timeout(regs + SFC_SR, status,
				 !(status & SFC_BUSY), 100,
				 1000 * USEC_PER_MSEC);
	if (ret) {
		dev_err(dev, "Wait for SFC idle timeout!\n");
		goto out;
	} else {
		if (likely(readl(regs + SFC_RAWISR) & DMA_INT))
			dev_err(dev, "DMA finished!\n");
		else
			dev_err(dev, "Last transfer non DMA!\n");
	}

	/* Parse ramdisk addr and help start decompressing */
	if (rds && rdd) {
		struct resource src, dst;
		u32 rdk_size = 0;
		const u32 *digest_org;

		if (of_address_to_resource(rds, 0, &src) >= 0 &&
		    of_address_to_resource(rdd, 0, &dst) >= 0) {
			if (IS_ENABLED(CONFIG_ROCKCHIP_THUNDER_BOOT_CRYPTO)) {
				of_property_read_u32(rds, "size", &rdk_size);
				digest_org = of_get_property(rds->child, "value", NULL);
				if (digest_org && rdk_size)
					rk_tb_sha256((dma_addr_t)src.start, rdk_size,
						     (void *)digest_org);
			}
			/*
			 * Decompress HW driver will free reserved area of
			 * memory-region-src.
			 */
			ret = rk_decom_start(GZIP_MOD, src.start,
					     dst.start,
					     resource_size(&dst));
			if (ret < 0)
				dev_err(dev, "failed to start decom\n");
		}
	}

out:
	of_node_put(rds);
	of_node_put(rdd);
	iounmap(regs);

	return 0;
}

static int __init rk_tb_sfc_probe(struct platform_device *pdev)
{
	int ret = 0;
	struct task_struct *tsk;

	tsk = kthread_run(rk_tb_sfc_thread, pdev, "tb_sfc");
	if (IS_ERR(tsk)) {
		ret = PTR_ERR(tsk);
		dev_err(&pdev->dev, "start thread failed (%d)\n", ret);
	}

	return ret;
}

#ifdef CONFIG_OF
static const struct of_device_id rk_tb_sfc_dt_match[] = {
	{ .compatible = "rockchip,thunder-boot-sfc" },
	{},
};
#endif

static struct platform_driver rk_tb_sfc_driver = {
	.driver		= {
		.name	= "rockchip_thunder_boot_sfc",
		.of_match_table = rk_tb_sfc_dt_match,
	},
};

static int __init rk_tb_sfc_init(void)
{
	struct device_node *node;

	node = of_find_matching_node(NULL, rk_tb_sfc_dt_match);
	if (node) {
		of_platform_device_create(node, NULL, NULL);
		of_node_put(node);
		return platform_driver_probe(&rk_tb_sfc_driver, rk_tb_sfc_probe);
	}

	return 0;
}

pure_initcall(rk_tb_sfc_init);