Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1015 insertions, 0 deletions

diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c
new file mode 100644
index 000000000..d421a2cca
--- /dev/null
+++ b/drivers/remoteproc/mtk_scp.c
@@ -0,0 +1,1015 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (c) 2019 MediaTek Inc.
+
+#include <asm/barrier.h>
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/of_reserved_mem.h>
+#include <linux/platform_device.h>
+#include <linux/remoteproc.h>
+#include <linux/remoteproc/mtk_scp.h>
+#include <linux/rpmsg/mtk_rpmsg.h>
+
+#include "mtk_common.h"
+#include "remoteproc_internal.h"
+
+#define MAX_CODE_SIZE 0x500000
+#define SECTION_NAME_IPI_BUFFER ".ipi_buffer"
+
+/**
+ * scp_get() - get a reference to SCP.
+ *
+ * @pdev:	the platform device of the module requesting SCP platform
+ *		device for using SCP API.
+ *
+ * Return: Return NULL if failed.  otherwise reference to SCP.
+ **/
+struct mtk_scp *scp_get(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *scp_node;
+	struct platform_device *scp_pdev;
+
+	scp_node = of_parse_phandle(dev->of_node, "mediatek,scp", 0);
+	if (!scp_node) {
+		dev_err(dev, "can't get SCP node\n");
+		return NULL;
+	}
+
+	scp_pdev = of_find_device_by_node(scp_node);
+	of_node_put(scp_node);
+
+	if (WARN_ON(!scp_pdev)) {
+		dev_err(dev, "SCP pdev failed\n");
+		return NULL;
+	}
+
+	return platform_get_drvdata(scp_pdev);
+}
+EXPORT_SYMBOL_GPL(scp_get);
+
+/**
+ * scp_put() - "free" the SCP
+ *
+ * @scp:	mtk_scp structure from scp_get().
+ **/
+void scp_put(struct mtk_scp *scp)
+{
+	put_device(scp->dev);
+}
+EXPORT_SYMBOL_GPL(scp_put);
+
+static void scp_wdt_handler(struct mtk_scp *scp, u32 scp_to_host)
+{
+	dev_err(scp->dev, "SCP watchdog timeout! 0x%x", scp_to_host);
+	rproc_report_crash(scp->rproc, RPROC_WATCHDOG);
+}
+
+static void scp_init_ipi_handler(void *data, unsigned int len, void *priv)
+{
+	struct mtk_scp *scp = (struct mtk_scp *)priv;
+	struct scp_run *run = (struct scp_run *)data;
+
+	scp->run.signaled = run->signaled;
+	strscpy(scp->run.fw_ver, run->fw_ver, SCP_FW_VER_LEN);
+	scp->run.dec_capability = run->dec_capability;
+	scp->run.enc_capability = run->enc_capability;
+	wake_up_interruptible(&scp->run.wq);
+}
+
+static void scp_ipi_handler(struct mtk_scp *scp)
+{
+	struct mtk_share_obj __iomem *rcv_obj = scp->recv_buf;
+	struct scp_ipi_desc *ipi_desc = scp->ipi_desc;
+	u8 tmp_data[SCP_SHARE_BUFFER_SIZE];
+	scp_ipi_handler_t handler;
+	u32 id = readl(&rcv_obj->id);
+	u32 len = readl(&rcv_obj->len);
+
+	if (len > SCP_SHARE_BUFFER_SIZE) {
+		dev_err(scp->dev, "ipi message too long (len %d, max %d)", len,
+			SCP_SHARE_BUFFER_SIZE);
+		return;
+	}
+	if (id >= SCP_IPI_MAX) {
+		dev_err(scp->dev, "No such ipi id = %d\n", id);
+		return;
+	}
+
+	scp_ipi_lock(scp, id);
+	handler = ipi_desc[id].handler;
+	if (!handler) {
+		dev_err(scp->dev, "No such ipi id = %d\n", id);
+		scp_ipi_unlock(scp, id);
+		return;
+	}
+
+	memcpy_fromio(tmp_data, &rcv_obj->share_buf, len);
+	handler(tmp_data, len, ipi_desc[id].priv);
+	scp_ipi_unlock(scp, id);
+
+	scp->ipi_id_ack[id] = true;
+	wake_up(&scp->ack_wq);
+}
+
+static int scp_elf_read_ipi_buf_addr(struct mtk_scp *scp,
+				     const struct firmware *fw,
+				     size_t *offset);
+
+static int scp_ipi_init(struct mtk_scp *scp, const struct firmware *fw)
+{
+	int ret;
+	size_t offset;
+
+	/* read the ipi buf addr from FW itself first */
+	ret = scp_elf_read_ipi_buf_addr(scp, fw, &offset);
+	if (ret) {
+		/* use default ipi buf addr if the FW doesn't have it */
+		offset = scp->data->ipi_buf_offset;
+		if (!offset)
+			return ret;
+	}
+	dev_info(scp->dev, "IPI buf addr %#010zx\n", offset);
+
+	scp->recv_buf = (struct mtk_share_obj __iomem *)
+			(scp->sram_base + offset);
+	scp->send_buf = (struct mtk_share_obj __iomem *)
+			(scp->sram_base + offset + sizeof(*scp->recv_buf));
+	memset_io(scp->recv_buf, 0, sizeof(*scp->recv_buf));
+	memset_io(scp->send_buf, 0, sizeof(*scp->send_buf));
+
+	return 0;
+}
+
+static void mt8183_scp_reset_assert(struct mtk_scp *scp)
+{
+	u32 val;
+
+	val = readl(scp->reg_base + MT8183_SW_RSTN);
+	val &= ~MT8183_SW_RSTN_BIT;
+	writel(val, scp->reg_base + MT8183_SW_RSTN);
+}
+
+static void mt8183_scp_reset_deassert(struct mtk_scp *scp)
+{
+	u32 val;
+
+	val = readl(scp->reg_base + MT8183_SW_RSTN);
+	val |= MT8183_SW_RSTN_BIT;
+	writel(val, scp->reg_base + MT8183_SW_RSTN);
+}
+
+static void mt8192_scp_reset_assert(struct mtk_scp *scp)
+{
+	writel(1, scp->reg_base + MT8192_CORE0_SW_RSTN_SET);
+}
+
+static void mt8192_scp_reset_deassert(struct mtk_scp *scp)
+{
+	writel(1, scp->reg_base + MT8192_CORE0_SW_RSTN_CLR);
+}
+
+static void mt8183_scp_irq_handler(struct mtk_scp *scp)
+{
+	u32 scp_to_host;
+
+	scp_to_host = readl(scp->reg_base + MT8183_SCP_TO_HOST);
+	if (scp_to_host & MT8183_SCP_IPC_INT_BIT)
+		scp_ipi_handler(scp);
+	else
+		scp_wdt_handler(scp, scp_to_host);
+
+	/* SCP won't send another interrupt until we set SCP_TO_HOST to 0. */
+	writel(MT8183_SCP_IPC_INT_BIT | MT8183_SCP_WDT_INT_BIT,
+	       scp->reg_base + MT8183_SCP_TO_HOST);
+}
+
+static void mt8192_scp_irq_handler(struct mtk_scp *scp)
+{
+	u32 scp_to_host;
+
+	scp_to_host = readl(scp->reg_base + MT8192_SCP2APMCU_IPC_SET);
+
+	if (scp_to_host & MT8192_SCP_IPC_INT_BIT) {
+		scp_ipi_handler(scp);
+
+		/*
+		 * SCP won't send another interrupt until we clear
+		 * MT8192_SCP2APMCU_IPC.
+		 */
+		writel(MT8192_SCP_IPC_INT_BIT,
+		       scp->reg_base + MT8192_SCP2APMCU_IPC_CLR);
+	} else {
+		scp_wdt_handler(scp, scp_to_host);
+		writel(1, scp->reg_base + MT8192_CORE0_WDT_IRQ);
+	}
+}
+
+static irqreturn_t scp_irq_handler(int irq, void *priv)
+{
+	struct mtk_scp *scp = priv;
+	int ret;
+
+	ret = clk_prepare_enable(scp->clk);
+	if (ret) {
+		dev_err(scp->dev, "failed to enable clocks\n");
+		return IRQ_NONE;
+	}
+
+	scp->data->scp_irq_handler(scp);
+
+	clk_disable_unprepare(scp->clk);
+
+	return IRQ_HANDLED;
+}
+
+static int scp_elf_load_segments(struct rproc *rproc, const struct firmware *fw)
+{
+	struct device *dev = &rproc->dev;
+	struct elf32_hdr *ehdr;
+	struct elf32_phdr *phdr;
+	int i, ret = 0;
+	const u8 *elf_data = fw->data;
+
+	ehdr = (struct elf32_hdr *)elf_data;
+	phdr = (struct elf32_phdr *)(elf_data + ehdr->e_phoff);
+
+	/* go through the available ELF segments */
+	for (i = 0; i < ehdr->e_phnum; i++, phdr++) {
+		u32 da = phdr->p_paddr;
+		u32 memsz = phdr->p_memsz;
+		u32 filesz = phdr->p_filesz;
+		u32 offset = phdr->p_offset;
+		void __iomem *ptr;
+
+		dev_dbg(dev, "phdr: type %d da 0x%x memsz 0x%x filesz 0x%x\n",
+			phdr->p_type, da, memsz, filesz);
+
+		if (phdr->p_type != PT_LOAD)
+			continue;
+		if (!filesz)
+			continue;
+
+		if (filesz > memsz) {
+			dev_err(dev, "bad phdr filesz 0x%x memsz 0x%x\n",
+				filesz, memsz);
+			ret = -EINVAL;
+			break;
+		}
+
+		if (offset + filesz > fw->size) {
+			dev_err(dev, "truncated fw: need 0x%x avail 0x%zx\n",
+				offset + filesz, fw->size);
+			ret = -EINVAL;
+			break;
+		}
+
+		/* grab the kernel address for this device address */
+		ptr = (void __iomem *)rproc_da_to_va(rproc, da, memsz, NULL);
+		if (!ptr) {
+			dev_err(dev, "bad phdr da 0x%x mem 0x%x\n", da, memsz);
+			ret = -EINVAL;
+			break;
+		}
+
+		/* put the segment where the remote processor expects it */
+		scp_memcpy_aligned(ptr, elf_data + phdr->p_offset, filesz);
+	}
+
+	return ret;
+}
+
+static int scp_elf_read_ipi_buf_addr(struct mtk_scp *scp,
+				     const struct firmware *fw,
+				     size_t *offset)
+{
+	struct elf32_hdr *ehdr;
+	struct elf32_shdr *shdr, *shdr_strtab;
+	int i;
+	const u8 *elf_data = fw->data;
+	const char *strtab;
+
+	ehdr = (struct elf32_hdr *)elf_data;
+	shdr = (struct elf32_shdr *)(elf_data + ehdr->e_shoff);
+	shdr_strtab = shdr + ehdr->e_shstrndx;
+	strtab = (const char *)(elf_data + shdr_strtab->sh_offset);
+
+	for (i = 0; i < ehdr->e_shnum; i++, shdr++) {
+		if (strcmp(strtab + shdr->sh_name,
+			   SECTION_NAME_IPI_BUFFER) == 0) {
+			*offset = shdr->sh_addr;
+			return 0;
+		}
+	}
+
+	return -ENOENT;
+}
+
+static int mt8183_scp_clk_get(struct mtk_scp *scp)
+{
+	struct device *dev = scp->dev;
+	int ret = 0;
+
+	scp->clk = devm_clk_get(dev, "main");
+	if (IS_ERR(scp->clk)) {
+		dev_err(dev, "Failed to get clock\n");
+		ret = PTR_ERR(scp->clk);
+	}
+
+	return ret;
+}
+
+static int mt8192_scp_clk_get(struct mtk_scp *scp)
+{
+	return mt8183_scp_clk_get(scp);
+}
+
+static int mt8195_scp_clk_get(struct mtk_scp *scp)
+{
+	scp->clk = NULL;
+
+	return 0;
+}
+
+static int mt8183_scp_before_load(struct mtk_scp *scp)
+{
+	/* Clear SCP to host interrupt */
+	writel(MT8183_SCP_IPC_INT_BIT, scp->reg_base + MT8183_SCP_TO_HOST);
+
+	/* Reset clocks before loading FW */
+	writel(0x0, scp->reg_base + MT8183_SCP_CLK_SW_SEL);
+	writel(0x0, scp->reg_base + MT8183_SCP_CLK_DIV_SEL);
+
+	/* Initialize TCM before loading FW. */
+	writel(0x0, scp->reg_base + MT8183_SCP_L1_SRAM_PD);
+	writel(0x0, scp->reg_base + MT8183_SCP_TCM_TAIL_SRAM_PD);
+
+	/* Turn on the power of SCP's SRAM before using it. */
+	writel(0x0, scp->reg_base + MT8183_SCP_SRAM_PDN);
+
+	/*
+	 * Set I-cache and D-cache size before loading SCP FW.
+	 * SCP SRAM logical address may change when cache size setting differs.
+	 */
+	writel(MT8183_SCP_CACHE_CON_WAYEN | MT8183_SCP_CACHESIZE_8KB,
+	       scp->reg_base + MT8183_SCP_CACHE_CON);
+	writel(MT8183_SCP_CACHESIZE_8KB, scp->reg_base + MT8183_SCP_DCACHE_CON);
+
+	return 0;
+}
+
+static void scp_sram_power_on(void __iomem *addr, u32 reserved_mask)
+{
+	int i;
+
+	for (i = 31; i >= 0; i--)
+		writel(GENMASK(i, 0) & ~reserved_mask, addr);
+	writel(0, addr);
+}
+
+static void scp_sram_power_off(void __iomem *addr, u32 reserved_mask)
+{
+	int i;
+
+	writel(0, addr);
+	for (i = 0; i < 32; i++)
+		writel(GENMASK(i, 0) & ~reserved_mask, addr);
+}
+
+static int mt8186_scp_before_load(struct mtk_scp *scp)
+{
+	/* Clear SCP to host interrupt */
+	writel(MT8183_SCP_IPC_INT_BIT, scp->reg_base + MT8183_SCP_TO_HOST);
+
+	/* Reset clocks before loading FW */
+	writel(0x0, scp->reg_base + MT8183_SCP_CLK_SW_SEL);
+	writel(0x0, scp->reg_base + MT8183_SCP_CLK_DIV_SEL);
+
+	/* Turn on the power of SCP's SRAM before using it. Enable 1 block per time*/
+	scp_sram_power_on(scp->reg_base + MT8183_SCP_SRAM_PDN, 0);
+
+	/* Initialize TCM before loading FW. */
+	writel(0x0, scp->reg_base + MT8183_SCP_L1_SRAM_PD);
+	writel(0x0, scp->reg_base + MT8183_SCP_TCM_TAIL_SRAM_PD);
+	writel(0x0, scp->reg_base + MT8186_SCP_L1_SRAM_PD_P1);
+	writel(0x0, scp->reg_base + MT8186_SCP_L1_SRAM_PD_p2);
+
+	/*
+	 * Set I-cache and D-cache size before loading SCP FW.
+	 * SCP SRAM logical address may change when cache size setting differs.
+	 */
+	writel(MT8183_SCP_CACHE_CON_WAYEN | MT8183_SCP_CACHESIZE_8KB,
+	       scp->reg_base + MT8183_SCP_CACHE_CON);
+	writel(MT8183_SCP_CACHESIZE_8KB, scp->reg_base + MT8183_SCP_DCACHE_CON);
+
+	return 0;
+}
+
+static int mt8192_scp_before_load(struct mtk_scp *scp)
+{
+	/* clear SPM interrupt, SCP2SPM_IPC_CLR */
+	writel(0xff, scp->reg_base + MT8192_SCP2SPM_IPC_CLR);
+
+	writel(1, scp->reg_base + MT8192_CORE0_SW_RSTN_SET);
+
+	/* enable SRAM clock */
+	scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_0, 0);
+	scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_1, 0);
+	scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_2, 0);
+	scp_sram_power_on(scp->reg_base + MT8192_L1TCM_SRAM_PDN, 0);
+	scp_sram_power_on(scp->reg_base + MT8192_CPU0_SRAM_PD, 0);
+
+	/* enable MPU for all memory regions */
+	writel(0xff, scp->reg_base + MT8192_CORE0_MEM_ATT_PREDEF);
+
+	return 0;
+}
+
+static int mt8195_scp_before_load(struct mtk_scp *scp)
+{
+	/* clear SPM interrupt, SCP2SPM_IPC_CLR */
+	writel(0xff, scp->reg_base + MT8192_SCP2SPM_IPC_CLR);
+
+	writel(1, scp->reg_base + MT8192_CORE0_SW_RSTN_SET);
+
+	/* enable SRAM clock */
+	scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_0, 0);
+	scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_1, 0);
+	scp_sram_power_on(scp->reg_base + MT8192_L2TCM_SRAM_PD_2, 0);
+	scp_sram_power_on(scp->reg_base + MT8192_L1TCM_SRAM_PDN,
+			  MT8195_L1TCM_SRAM_PDN_RESERVED_RSI_BITS);
+	scp_sram_power_on(scp->reg_base + MT8192_CPU0_SRAM_PD, 0);
+
+	/* enable MPU for all memory regions */
+	writel(0xff, scp->reg_base + MT8192_CORE0_MEM_ATT_PREDEF);
+
+	return 0;
+}
+
+static int scp_load(struct rproc *rproc, const struct firmware *fw)
+{
+	struct mtk_scp *scp = rproc->priv;
+	struct device *dev = scp->dev;
+	int ret;
+
+	ret = clk_prepare_enable(scp->clk);
+	if (ret) {
+		dev_err(dev, "failed to enable clocks\n");
+		return ret;
+	}
+
+	/* Hold SCP in reset while loading FW. */
+	scp->data->scp_reset_assert(scp);
+
+	ret = scp->data->scp_before_load(scp);
+	if (ret < 0)
+		goto leave;
+
+	ret = scp_elf_load_segments(rproc, fw);
+leave:
+	clk_disable_unprepare(scp->clk);
+
+	return ret;
+}
+
+static int scp_parse_fw(struct rproc *rproc, const struct firmware *fw)
+{
+	struct mtk_scp *scp = rproc->priv;
+	struct device *dev = scp->dev;
+	int ret;
+
+	ret = clk_prepare_enable(scp->clk);
+	if (ret) {
+		dev_err(dev, "failed to enable clocks\n");
+		return ret;
+	}
+
+	ret = scp_ipi_init(scp, fw);
+	clk_disable_unprepare(scp->clk);
+	return ret;
+}
+
+static int scp_start(struct rproc *rproc)
+{
+	struct mtk_scp *scp = (struct mtk_scp *)rproc->priv;
+	struct device *dev = scp->dev;
+	struct scp_run *run = &scp->run;
+	int ret;
+
+	ret = clk_prepare_enable(scp->clk);
+	if (ret) {
+		dev_err(dev, "failed to enable clocks\n");
+		return ret;
+	}
+
+	run->signaled = false;
+
+	scp->data->scp_reset_deassert(scp);
+
+	ret = wait_event_interruptible_timeout(
+					run->wq,
+					run->signaled,
+					msecs_to_jiffies(2000));
+
+	if (ret == 0) {
+		dev_err(dev, "wait SCP initialization timeout!\n");
+		ret = -ETIME;
+		goto stop;
+	}
+	if (ret == -ERESTARTSYS) {
+		dev_err(dev, "wait SCP interrupted by a signal!\n");
+		goto stop;
+	}
+
+	clk_disable_unprepare(scp->clk);
+	dev_info(dev, "SCP is ready. FW version %s\n", run->fw_ver);
+
+	return 0;
+
+stop:
+	scp->data->scp_reset_assert(scp);
+	clk_disable_unprepare(scp->clk);
+	return ret;
+}
+
+static void *mt8183_scp_da_to_va(struct mtk_scp *scp, u64 da, size_t len)
+{
+	int offset;
+
+	if (da < scp->sram_size) {
+		offset = da;
+		if (offset >= 0 && (offset + len) <= scp->sram_size)
+			return (void __force *)scp->sram_base + offset;
+	} else if (scp->dram_size) {
+		offset = da - scp->dma_addr;
+		if (offset >= 0 && (offset + len) <= scp->dram_size)
+			return scp->cpu_addr + offset;
+	}
+
+	return NULL;
+}
+
+static void *mt8192_scp_da_to_va(struct mtk_scp *scp, u64 da, size_t len)
+{
+	int offset;
+
+	if (da >= scp->sram_phys &&
+	    (da + len) <= scp->sram_phys + scp->sram_size) {
+		offset = da - scp->sram_phys;
+		return (void __force *)scp->sram_base + offset;
+	}
+
+	/* optional memory region */
+	if (scp->l1tcm_size &&
+	    da >= scp->l1tcm_phys &&
+	    (da + len) <= scp->l1tcm_phys + scp->l1tcm_size) {
+		offset = da - scp->l1tcm_phys;
+		return (void __force *)scp->l1tcm_base + offset;
+	}
+
+	/* optional memory region */
+	if (scp->dram_size &&
+	    da >= scp->dma_addr &&
+	    (da + len) <= scp->dma_addr + scp->dram_size) {
+		offset = da - scp->dma_addr;
+		return scp->cpu_addr + offset;
+	}
+
+	return NULL;
+}
+
+static void *scp_da_to_va(struct rproc *rproc, u64 da, size_t len, bool *is_iomem)
+{
+	struct mtk_scp *scp = (struct mtk_scp *)rproc->priv;
+
+	return scp->data->scp_da_to_va(scp, da, len);
+}
+
+static void mt8183_scp_stop(struct mtk_scp *scp)
+{
+	/* Disable SCP watchdog */
+	writel(0, scp->reg_base + MT8183_WDT_CFG);
+}
+
+static void mt8192_scp_stop(struct mtk_scp *scp)
+{
+	/* Disable SRAM clock */
+	scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_0, 0);
+	scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_1, 0);
+	scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_2, 0);
+	scp_sram_power_off(scp->reg_base + MT8192_L1TCM_SRAM_PDN, 0);
+	scp_sram_power_off(scp->reg_base + MT8192_CPU0_SRAM_PD, 0);
+
+	/* Disable SCP watchdog */
+	writel(0, scp->reg_base + MT8192_CORE0_WDT_CFG);
+}
+
+static void mt8195_scp_stop(struct mtk_scp *scp)
+{
+	/* Disable SRAM clock */
+	scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_0, 0);
+	scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_1, 0);
+	scp_sram_power_off(scp->reg_base + MT8192_L2TCM_SRAM_PD_2, 0);
+	scp_sram_power_off(scp->reg_base + MT8192_L1TCM_SRAM_PDN,
+			   MT8195_L1TCM_SRAM_PDN_RESERVED_RSI_BITS);
+	scp_sram_power_off(scp->reg_base + MT8192_CPU0_SRAM_PD, 0);
+
+	/* Disable SCP watchdog */
+	writel(0, scp->reg_base + MT8192_CORE0_WDT_CFG);
+}
+
+static int scp_stop(struct rproc *rproc)
+{
+	struct mtk_scp *scp = (struct mtk_scp *)rproc->priv;
+	int ret;
+
+	ret = clk_prepare_enable(scp->clk);
+	if (ret) {
+		dev_err(scp->dev, "failed to enable clocks\n");
+		return ret;
+	}
+
+	scp->data->scp_reset_assert(scp);
+	scp->data->scp_stop(scp);
+	clk_disable_unprepare(scp->clk);
+
+	return 0;
+}
+
+static const struct rproc_ops scp_ops = {
+	.start		= scp_start,
+	.stop		= scp_stop,
+	.load		= scp_load,
+	.da_to_va	= scp_da_to_va,
+	.parse_fw	= scp_parse_fw,
+};
+
+/**
+ * scp_get_device() - get device struct of SCP
+ *
+ * @scp:	mtk_scp structure
+ **/
+struct device *scp_get_device(struct mtk_scp *scp)
+{
+	return scp->dev;
+}
+EXPORT_SYMBOL_GPL(scp_get_device);
+
+/**
+ * scp_get_rproc() - get rproc struct of SCP
+ *
+ * @scp:	mtk_scp structure
+ **/
+struct rproc *scp_get_rproc(struct mtk_scp *scp)
+{
+	return scp->rproc;
+}
+EXPORT_SYMBOL_GPL(scp_get_rproc);
+
+/**
+ * scp_get_vdec_hw_capa() - get video decoder hardware capability
+ *
+ * @scp:	mtk_scp structure
+ *
+ * Return: video decoder hardware capability
+ **/
+unsigned int scp_get_vdec_hw_capa(struct mtk_scp *scp)
+{
+	return scp->run.dec_capability;
+}
+EXPORT_SYMBOL_GPL(scp_get_vdec_hw_capa);
+
+/**
+ * scp_get_venc_hw_capa() - get video encoder hardware capability
+ *
+ * @scp:	mtk_scp structure
+ *
+ * Return: video encoder hardware capability
+ **/
+unsigned int scp_get_venc_hw_capa(struct mtk_scp *scp)
+{
+	return scp->run.enc_capability;
+}
+EXPORT_SYMBOL_GPL(scp_get_venc_hw_capa);
+
+/**
+ * scp_mapping_dm_addr() - Mapping SRAM/DRAM to kernel virtual address
+ *
+ * @scp:	mtk_scp structure
+ * @mem_addr:	SCP views memory address
+ *
+ * Mapping the SCP's SRAM address /
+ * DMEM (Data Extended Memory) memory address /
+ * Working buffer memory address to
+ * kernel virtual address.
+ *
+ * Return: Return ERR_PTR(-EINVAL) if mapping failed,
+ * otherwise the mapped kernel virtual address
+ **/
+void *scp_mapping_dm_addr(struct mtk_scp *scp, u32 mem_addr)
+{
+	void *ptr;
+
+	ptr = scp_da_to_va(scp->rproc, mem_addr, 0, NULL);
+	if (!ptr)
+		return ERR_PTR(-EINVAL);
+
+	return ptr;
+}
+EXPORT_SYMBOL_GPL(scp_mapping_dm_addr);
+
+static int scp_map_memory_region(struct mtk_scp *scp)
+{
+	int ret;
+
+	ret = of_reserved_mem_device_init(scp->dev);
+
+	/* reserved memory is optional. */
+	if (ret == -ENODEV) {
+		dev_info(scp->dev, "skipping reserved memory initialization.");
+		return 0;
+	}
+
+	if (ret) {
+		dev_err(scp->dev, "failed to assign memory-region: %d\n", ret);
+		return -ENOMEM;
+	}
+
+	/* Reserved SCP code size */
+	scp->dram_size = MAX_CODE_SIZE;
+	scp->cpu_addr = dma_alloc_coherent(scp->dev, scp->dram_size,
+					   &scp->dma_addr, GFP_KERNEL);
+	if (!scp->cpu_addr)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static void scp_unmap_memory_region(struct mtk_scp *scp)
+{
+	if (scp->dram_size == 0)
+		return;
+
+	dma_free_coherent(scp->dev, scp->dram_size, scp->cpu_addr,
+			  scp->dma_addr);
+	of_reserved_mem_device_release(scp->dev);
+}
+
+static int scp_register_ipi(struct platform_device *pdev, u32 id,
+			    ipi_handler_t handler, void *priv)
+{
+	struct mtk_scp *scp = platform_get_drvdata(pdev);
+
+	return scp_ipi_register(scp, id, handler, priv);
+}
+
+static void scp_unregister_ipi(struct platform_device *pdev, u32 id)
+{
+	struct mtk_scp *scp = platform_get_drvdata(pdev);
+
+	scp_ipi_unregister(scp, id);
+}
+
+static int scp_send_ipi(struct platform_device *pdev, u32 id, void *buf,
+			unsigned int len, unsigned int wait)
+{
+	struct mtk_scp *scp = platform_get_drvdata(pdev);
+
+	return scp_ipi_send(scp, id, buf, len, wait);
+}
+
+static struct mtk_rpmsg_info mtk_scp_rpmsg_info = {
+	.send_ipi = scp_send_ipi,
+	.register_ipi = scp_register_ipi,
+	.unregister_ipi = scp_unregister_ipi,
+	.ns_ipi_id = SCP_IPI_NS_SERVICE,
+};
+
+static void scp_add_rpmsg_subdev(struct mtk_scp *scp)
+{
+	scp->rpmsg_subdev =
+		mtk_rpmsg_create_rproc_subdev(to_platform_device(scp->dev),
+					      &mtk_scp_rpmsg_info);
+	if (scp->rpmsg_subdev)
+		rproc_add_subdev(scp->rproc, scp->rpmsg_subdev);
+}
+
+static void scp_remove_rpmsg_subdev(struct mtk_scp *scp)
+{
+	if (scp->rpmsg_subdev) {
+		rproc_remove_subdev(scp->rproc, scp->rpmsg_subdev);
+		mtk_rpmsg_destroy_rproc_subdev(scp->rpmsg_subdev);
+		scp->rpmsg_subdev = NULL;
+	}
+}
+
+static int scp_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *np = dev->of_node;
+	struct mtk_scp *scp;
+	struct rproc *rproc;
+	struct resource *res;
+	const char *fw_name = "scp.img";
+	int ret, i;
+
+	ret = rproc_of_parse_firmware(dev, 0, &fw_name);
+	if (ret < 0 && ret != -EINVAL)
+		return ret;
+
+	rproc = devm_rproc_alloc(dev, np->name, &scp_ops, fw_name, sizeof(*scp));
+	if (!rproc)
+		return dev_err_probe(dev, -ENOMEM, "unable to allocate remoteproc\n");
+
+	scp = (struct mtk_scp *)rproc->priv;
+	scp->rproc = rproc;
+	scp->dev = dev;
+	scp->data = of_device_get_match_data(dev);
+	platform_set_drvdata(pdev, scp);
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sram");
+	scp->sram_base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(scp->sram_base))
+		return dev_err_probe(dev, PTR_ERR(scp->sram_base),
+				     "Failed to parse and map sram memory\n");
+
+	scp->sram_size = resource_size(res);
+	scp->sram_phys = res->start;
+
+	/* l1tcm is an optional memory region */
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "l1tcm");
+	scp->l1tcm_base = devm_ioremap_resource(dev, res);
+	if (IS_ERR(scp->l1tcm_base)) {
+		ret = PTR_ERR(scp->l1tcm_base);
+		if (ret != -EINVAL) {
+			return dev_err_probe(dev, ret, "Failed to map l1tcm memory\n");
+		}
+	} else {
+		scp->l1tcm_size = resource_size(res);
+		scp->l1tcm_phys = res->start;
+	}
+
+	scp->reg_base = devm_platform_ioremap_resource_byname(pdev, "cfg");
+	if (IS_ERR(scp->reg_base))
+		return dev_err_probe(dev, PTR_ERR(scp->reg_base),
+				     "Failed to parse and map cfg memory\n");
+
+	ret = scp->data->scp_clk_get(scp);
+	if (ret)
+		return ret;
+
+	ret = scp_map_memory_region(scp);
+	if (ret)
+		return ret;
+
+	mutex_init(&scp->send_lock);
+	for (i = 0; i < SCP_IPI_MAX; i++)
+		mutex_init(&scp->ipi_desc[i].lock);
+
+	/* register SCP initialization IPI */
+	ret = scp_ipi_register(scp, SCP_IPI_INIT, scp_init_ipi_handler, scp);
+	if (ret) {
+		dev_err(dev, "Failed to register IPI_SCP_INIT\n");
+		goto release_dev_mem;
+	}
+
+	init_waitqueue_head(&scp->run.wq);
+	init_waitqueue_head(&scp->ack_wq);
+
+	scp_add_rpmsg_subdev(scp);
+
+	ret = devm_request_threaded_irq(dev, platform_get_irq(pdev, 0), NULL,
+					scp_irq_handler, IRQF_ONESHOT,
+					pdev->name, scp);
+
+	if (ret) {
+		dev_err(dev, "failed to request irq\n");
+		goto remove_subdev;
+	}
+
+	ret = rproc_add(rproc);
+	if (ret)
+		goto remove_subdev;
+
+	return 0;
+
+remove_subdev:
+	scp_remove_rpmsg_subdev(scp);
+	scp_ipi_unregister(scp, SCP_IPI_INIT);
+release_dev_mem:
+	scp_unmap_memory_region(scp);
+	for (i = 0; i < SCP_IPI_MAX; i++)
+		mutex_destroy(&scp->ipi_desc[i].lock);
+	mutex_destroy(&scp->send_lock);
+
+	return ret;
+}
+
+static int scp_remove(struct platform_device *pdev)
+{
+	struct mtk_scp *scp = platform_get_drvdata(pdev);
+	int i;
+
+	rproc_del(scp->rproc);
+	scp_remove_rpmsg_subdev(scp);
+	scp_ipi_unregister(scp, SCP_IPI_INIT);
+	scp_unmap_memory_region(scp);
+	for (i = 0; i < SCP_IPI_MAX; i++)
+		mutex_destroy(&scp->ipi_desc[i].lock);
+	mutex_destroy(&scp->send_lock);
+
+	return 0;
+}
+
+static const struct mtk_scp_of_data mt8183_of_data = {
+	.scp_clk_get = mt8183_scp_clk_get,
+	.scp_before_load = mt8183_scp_before_load,
+	.scp_irq_handler = mt8183_scp_irq_handler,
+	.scp_reset_assert = mt8183_scp_reset_assert,
+	.scp_reset_deassert = mt8183_scp_reset_deassert,
+	.scp_stop = mt8183_scp_stop,
+	.scp_da_to_va = mt8183_scp_da_to_va,
+	.host_to_scp_reg = MT8183_HOST_TO_SCP,
+	.host_to_scp_int_bit = MT8183_HOST_IPC_INT_BIT,
+	.ipi_buf_offset = 0x7bdb0,
+};
+
+static const struct mtk_scp_of_data mt8186_of_data = {
+	.scp_clk_get = mt8195_scp_clk_get,
+	.scp_before_load = mt8186_scp_before_load,
+	.scp_irq_handler = mt8183_scp_irq_handler,
+	.scp_reset_assert = mt8183_scp_reset_assert,
+	.scp_reset_deassert = mt8183_scp_reset_deassert,
+	.scp_stop = mt8183_scp_stop,
+	.scp_da_to_va = mt8183_scp_da_to_va,
+	.host_to_scp_reg = MT8183_HOST_TO_SCP,
+	.host_to_scp_int_bit = MT8183_HOST_IPC_INT_BIT,
+	.ipi_buf_offset = 0x3bdb0,
+};
+
+static const struct mtk_scp_of_data mt8188_of_data = {
+	.scp_clk_get = mt8195_scp_clk_get,
+	.scp_before_load = mt8192_scp_before_load,
+	.scp_irq_handler = mt8192_scp_irq_handler,
+	.scp_reset_assert = mt8192_scp_reset_assert,
+	.scp_reset_deassert = mt8192_scp_reset_deassert,
+	.scp_stop = mt8192_scp_stop,
+	.scp_da_to_va = mt8192_scp_da_to_va,
+	.host_to_scp_reg = MT8192_GIPC_IN_SET,
+	.host_to_scp_int_bit = MT8192_HOST_IPC_INT_BIT,
+};
+
+static const struct mtk_scp_of_data mt8192_of_data = {
+	.scp_clk_get = mt8192_scp_clk_get,
+	.scp_before_load = mt8192_scp_before_load,
+	.scp_irq_handler = mt8192_scp_irq_handler,
+	.scp_reset_assert = mt8192_scp_reset_assert,
+	.scp_reset_deassert = mt8192_scp_reset_deassert,
+	.scp_stop = mt8192_scp_stop,
+	.scp_da_to_va = mt8192_scp_da_to_va,
+	.host_to_scp_reg = MT8192_GIPC_IN_SET,
+	.host_to_scp_int_bit = MT8192_HOST_IPC_INT_BIT,
+};
+
+static const struct mtk_scp_of_data mt8195_of_data = {
+	.scp_clk_get = mt8195_scp_clk_get,
+	.scp_before_load = mt8195_scp_before_load,
+	.scp_irq_handler = mt8192_scp_irq_handler,
+	.scp_reset_assert = mt8192_scp_reset_assert,
+	.scp_reset_deassert = mt8192_scp_reset_deassert,
+	.scp_stop = mt8195_scp_stop,
+	.scp_da_to_va = mt8192_scp_da_to_va,
+	.host_to_scp_reg = MT8192_GIPC_IN_SET,
+	.host_to_scp_int_bit = MT8192_HOST_IPC_INT_BIT,
+};
+
+static const struct of_device_id mtk_scp_of_match[] = {
+	{ .compatible = "mediatek,mt8183-scp", .data = &mt8183_of_data },
+	{ .compatible = "mediatek,mt8186-scp", .data = &mt8186_of_data },
+	{ .compatible = "mediatek,mt8188-scp", .data = &mt8188_of_data },
+	{ .compatible = "mediatek,mt8192-scp", .data = &mt8192_of_data },
+	{ .compatible = "mediatek,mt8195-scp", .data = &mt8195_of_data },
+	{},
+};
+MODULE_DEVICE_TABLE(of, mtk_scp_of_match);
+
+static struct platform_driver mtk_scp_driver = {
+	.probe = scp_probe,
+	.remove = scp_remove,
+	.driver = {
+		.name = "mtk-scp",
+		.of_match_table = mtk_scp_of_match,
+	},
+};
+
+module_platform_driver(mtk_scp_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("MediaTek SCP control driver");