// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (C) 2020 Rockchip Electronics Co., Ltd.
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*/
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#include <linux/iopoll.h>
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#include <linux/kernel.h>
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#include <linux/kthread.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/soc/rockchip/rockchip_decompress.h>
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#include <linux/soc/rockchip/rockchip_thunderboot_crypto.h>
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#define SFC_ICLR 0x08
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#define SFC_SR 0x24
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#define SFC_RAWISR 0x28
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/* SFC_SR Register */
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#define SFC_BUSY BIT(0)
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/* SFC_RAWISR Register */
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#define DMA_INT BIT(7)
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static int rk_tb_sfc_thread(void *p)
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{
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int ret = 0;
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struct platform_device *pdev = p;
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void __iomem *regs;
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struct resource *res;
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struct device_node *rds, *rdd;
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struct device *dev = &pdev->dev;
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u32 status;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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regs = ioremap(res->start, resource_size(res));
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if (!regs) {
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dev_err(dev, "ioremap failed for resource %pR\n", res);
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return -ENOMEM;
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}
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rds = of_parse_phandle(dev->of_node, "memory-region-src", 0);
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rdd = of_parse_phandle(dev->of_node, "memory-region-dst", 0);
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#ifdef SFC_DEBUG
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print_hex_dump(KERN_WARNING, "tb_sfc", DUMP_PREFIX_OFFSET, 4, 4, regs, 0x60, 0);
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#endif
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ret = readl_poll_timeout(regs + SFC_SR, status,
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!(status & SFC_BUSY), 100,
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1000 * USEC_PER_MSEC);
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if (ret) {
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dev_err(dev, "Wait for SFC idle timeout!\n");
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goto out;
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} else {
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if (likely(readl(regs + SFC_RAWISR) & DMA_INT))
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dev_err(dev, "DMA finished!\n");
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else
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dev_err(dev, "Last transfer non DMA!\n");
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}
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/* Parse ramdisk addr and help start decompressing */
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if (rds && rdd) {
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struct resource src, dst;
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u32 rdk_size = 0;
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const u32 *digest_org;
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if (of_address_to_resource(rds, 0, &src) >= 0 &&
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of_address_to_resource(rdd, 0, &dst) >= 0) {
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if (IS_ENABLED(CONFIG_ROCKCHIP_THUNDER_BOOT_CRYPTO)) {
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of_property_read_u32(rds, "size", &rdk_size);
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digest_org = of_get_property(rds->child, "value", NULL);
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if (digest_org && rdk_size)
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rk_tb_sha256((dma_addr_t)src.start, rdk_size,
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(void *)digest_org);
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}
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/*
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* Decompress HW driver will free reserved area of
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* memory-region-src.
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*/
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ret = rk_decom_start(GZIP_MOD, src.start,
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dst.start,
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resource_size(&dst));
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if (ret < 0)
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dev_err(dev, "failed to start decom\n");
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}
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}
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out:
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of_node_put(rds);
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of_node_put(rdd);
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iounmap(regs);
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return 0;
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}
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static int __init rk_tb_sfc_probe(struct platform_device *pdev)
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{
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int ret = 0;
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struct task_struct *tsk;
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tsk = kthread_run(rk_tb_sfc_thread, pdev, "tb_sfc");
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if (IS_ERR(tsk)) {
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ret = PTR_ERR(tsk);
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dev_err(&pdev->dev, "start thread failed (%d)\n", ret);
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}
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return ret;
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}
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#ifdef CONFIG_OF
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static const struct of_device_id rk_tb_sfc_dt_match[] = {
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{ .compatible = "rockchip,thunder-boot-sfc" },
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{},
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};
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#endif
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static struct platform_driver rk_tb_sfc_driver = {
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.driver = {
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.name = "rockchip_thunder_boot_sfc",
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.of_match_table = rk_tb_sfc_dt_match,
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},
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};
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static int __init rk_tb_sfc_init(void)
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{
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struct device_node *node;
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node = of_find_matching_node(NULL, rk_tb_sfc_dt_match);
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if (node) {
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of_platform_device_create(node, NULL, NULL);
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of_node_put(node);
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return platform_driver_probe(&rk_tb_sfc_driver, rk_tb_sfc_probe);
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}
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return 0;
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}
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pure_initcall(rk_tb_sfc_init);
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