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bh=guUndGHI9as4unbWozKREYottJLvM1HnccvkyY6x2t4=; b=tJomVCpvMdAD+2JMZX+DGVn2LQG0LI4vxAeoKGUfDxD6eNG35sDGtTfSO7ZZ3pxuw1 X6mzoYBBKrbkBzsvbf56hcVKVK2z296GzbFFGO8l1SH9u4b70VBsTlxwPFhv6s9fyM/J ltXRmYIjCqhqj1DUWDem2HEY+HBj7VNtzK9kJ5eoddEUduDhOnGDjhIQIOZoVd1s311D lFoLfmAVqD5px+0iP+cGmZzOOltJsIcyuoqjmorvvoQlB35LlH97XAd+pwT8nb3C2gDv lITNinf4YoLpzZX7HorKxx2n2xn/UymHk8E/Yd4b/gs+ZqRAx8uhqcGWh55rvTl9KJCa L7Cw== X-Gm-Message-State: AJcUukeSLt5bt0BV+5YWNg7ahP9bhHNF0stvDnfXTad52k/DCtjtDwBD XNggy0qD6+97gQ5hHZGAu/hSTQ== X-Google-Smtp-Source: ALg8bN6xwfe6ZT4w1pDzJCIs/XTtQN5pleLjuM8lpJiZmTZl+zUMLxmWcXZ8KkY708mlgA3WLMEokQ== X-Received: by 2002:a63:f844:: with SMTP id v4mr17927126pgj.82.1545810844104; Tue, 25 Dec 2018 23:54:04 -0800 (PST) Received: from pihsun-z840.tpe.corp.google.com ([2401:fa00:1:10:7889:7a43:f899:134c]) by smtp.googlemail.com with ESMTPSA id 84sm107392395pfa.115.2018.12.25.23.54.01 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 25 Dec 2018 23:54:03 -0800 (PST) From: Pi-Hsun Shih Cc: Pi-Hsun Shih , Nicolas Boichat , Erin Lo , Ohad Ben-Cohen , Bjorn Andersson , Matthias Brugger , Eddie Huang , linux-kernel@vger.kernel.org (open list), linux-remoteproc@vger.kernel.org (open list:REMOTE PROCESSOR (REMOTEPROC) SUBSYSTEM), linux-arm-kernel@lists.infradead.org (moderated list:ARM/Mediatek SoC support), linux-mediatek@lists.infradead.org (moderated list:ARM/Mediatek SoC support) Subject: [RFC,2/5] remoteproc/mediatek: add SCP support for mt8183 Date: Wed, 26 Dec 2018 15:53:10 +0800 Message-Id: <20181226075330.82462-3-pihsun@chromium.org> X-Mailer: git-send-email 2.20.1.415.g653613c723-goog In-Reply-To: <20181226075330.82462-1-pihsun@chromium.org> References: <20181226075330.82462-1-pihsun@chromium.org> MIME-Version: 1.0 To: unlisted-recipients:; (no To-header on input) Sender: linux-remoteproc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-remoteproc@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Erin Lo Provide a basic driver to control Cortex M4 co-processor Signed-off-by: Erin Lo --- drivers/remoteproc/Kconfig | 9 + drivers/remoteproc/Makefile | 1 + drivers/remoteproc/mtk_scp.c | 568 ++++++++++++++++++++++++++ include/linux/platform_data/mtk_scp.h | 136 ++++++ 4 files changed, 714 insertions(+) create mode 100644 drivers/remoteproc/mtk_scp.c create mode 100644 include/linux/platform_data/mtk_scp.h diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig index f0abd26080447..ee0bda2376893 100644 --- a/drivers/remoteproc/Kconfig +++ b/drivers/remoteproc/Kconfig @@ -22,6 +22,15 @@ config IMX_REMOTEPROC It's safe to say N here. +config MTK_SCP + tristate "Mediatek SCP support" + depends on ARCH_MEDIATEK + help + Say y here to support Mediatek's SCP (Cortex M4 + on MT8183) via the remote processor framework. + + It's safe to say N here. + config OMAP_REMOTEPROC tristate "OMAP remoteproc support" depends on ARCH_OMAP4 || SOC_OMAP5 diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile index ce5d061e92be5..98e3498dbbe0e 100644 --- a/drivers/remoteproc/Makefile +++ b/drivers/remoteproc/Makefile @@ -10,6 +10,7 @@ remoteproc-y += remoteproc_sysfs.o remoteproc-y += remoteproc_virtio.o remoteproc-y += remoteproc_elf_loader.o obj-$(CONFIG_IMX_REMOTEPROC) += imx_rproc.o +obj-$(CONFIG_MTK_SCP) += mtk_scp.o obj-$(CONFIG_OMAP_REMOTEPROC) += omap_remoteproc.o obj-$(CONFIG_WKUP_M3_RPROC) += wkup_m3_rproc.o obj-$(CONFIG_DA8XX_REMOTEPROC) += da8xx_remoteproc.o diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c new file mode 100644 index 0000000000000..7a1a8fe53b54a --- /dev/null +++ b/drivers/remoteproc/mtk_scp.c @@ -0,0 +1,568 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Copyright (c) 2018 MediaTek Inc. + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "remoteproc_internal.h" + +#define MT8183_SW_RSTN 0x0 +#define MT8183_SW_RSTN_BIT BIT(0) +#define MT8183_SCP_TO_HOST 0x1C +#define MT8183_SCP_IPC_INT_BIT BIT(0) +#define MT8183_SCP_WDT_INT_BIT BIT(8) +#define MT8183_HOST_TO_SCP 0x28 +#define MT8183_HOST_IPC_INT_BIT BIT(0) +#define MT8183_SCP_SRAM_PDN 0x402C + +#define INIT_TIMEOUT_MS 2000 +#define IPI_TIMEOUT_MS 2000 +#define SCP_FW_VER_LEN 32 + +#define MAX_CODE_SIZE 0x500000 + +struct scp_run { + u32 signaled; + s8 fw_ver[SCP_FW_VER_LEN]; + u32 dec_capability; + u32 enc_capability; + wait_queue_head_t wq; +}; + +struct scp_ipi_desc { + ipi_handler_t handler; + const char *name; + void *priv; +}; + +struct mtk_scp { + struct device *dev; + struct rproc *rproc; + struct clk *clk; + void __iomem *reg_base; + void __iomem *sram_base; + size_t sram_size; + + struct share_obj *recv_buf; + struct share_obj *send_buf; + struct scp_run run; + struct mutex scp_mutex; /* for protecting mtk_scp data structure */ + struct scp_ipi_desc ipi_desc[IPI_MAX]; + bool ipi_id_ack[IPI_MAX]; + wait_queue_head_t ack_wq; + + void __iomem *cpu_addr; + phys_addr_t phys_addr; + size_t dram_size; +}; + +/** + * struct share_obj - SRAM buffer shared with + * AP and SCP + * + * @id: IPI id + * @len: share buffer length + * @share_buf: share buffer data + */ +struct share_obj { + s32 id; + u32 len; + u8 share_buf[288]; +}; + +int scp_ipi_register(struct platform_device *pdev, + enum ipi_id id, + ipi_handler_t handler, + const char *name, + void *priv) +{ + struct mtk_scp *scp = platform_get_drvdata(pdev); + struct scp_ipi_desc *ipi_desc; + + if (!scp) { + dev_err(&pdev->dev, "scp device is not ready\n"); + return -EPROBE_DEFER; + } + + if (WARN(id < 0 || id >= IPI_MAX || handler == NULL, + "register scp ipi id %d with invalid arguments\n", id)) + return -EINVAL; + + ipi_desc = scp->ipi_desc; + ipi_desc[id].name = name; + ipi_desc[id].handler = handler; + ipi_desc[id].priv = priv; + + return 0; +} +EXPORT_SYMBOL_GPL(scp_ipi_register); + +int scp_ipi_send(struct platform_device *pdev, + enum ipi_id id, void *buf, + unsigned int len, + unsigned int wait) +{ + struct mtk_scp *scp = platform_get_drvdata(pdev); + struct share_obj *send_obj = scp->send_buf; + unsigned long timeout; + int ret; + + if (WARN(id <= IPI_SCP_INIT || id >= IPI_MAX || + len > sizeof(send_obj->share_buf) || !buf, + "failed to send ipi message\n")) + return -EINVAL; + + ret = clk_prepare_enable(scp->clk); + if (ret) { + dev_err(scp->dev, "failed to enable clock\n"); + return ret; + } + + mutex_lock(&scp->scp_mutex); + + /* Wait until SCP receives the last command */ + timeout = jiffies + msecs_to_jiffies(IPI_TIMEOUT_MS); + do { + if (time_after(jiffies, timeout)) { + dev_err(scp->dev, "scp_ipi_send: IPI timeout!\n"); + ret = -EIO; + mutex_unlock(&scp->scp_mutex); + goto clock_disable; + } + } while (readl(scp->reg_base + MT8183_HOST_TO_SCP)); + + memcpy(send_obj->share_buf, buf, len); + send_obj->len = len; + send_obj->id = id; + + scp->ipi_id_ack[id] = false; + /* send the command to SCP */ + writel(MT8183_HOST_IPC_INT_BIT, scp->reg_base + MT8183_HOST_TO_SCP); + + mutex_unlock(&scp->scp_mutex); + + if (wait) { + /* wait for SCP's ACK */ + timeout = msecs_to_jiffies(wait); + ret = wait_event_timeout(scp->ack_wq, + scp->ipi_id_ack[id], + timeout); + scp->ipi_id_ack[id] = false; + if (WARN(!ret, + "scp ipi %d ack time out !", id)) + ret = -EIO; + else + ret = 0; + } + +clock_disable: + clk_disable_unprepare(scp->clk); + + return ret; +} +EXPORT_SYMBOL_GPL(scp_ipi_send); + +struct platform_device *scp_get_plat_device(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); + if (WARN_ON(!scp_pdev)) { + dev_err(dev, "scp pdev failed\n"); + of_node_put(scp_node); + return NULL; + } + + return scp_pdev; +} +EXPORT_SYMBOL_GPL(scp_get_plat_device); + +static void scp_wdt_handler(struct mtk_scp *scp) +{ + 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; + strncpy(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 share_obj *rcv_obj = scp->recv_buf; + struct scp_ipi_desc *ipi_desc = scp->ipi_desc; + u8 tmp_data[288]; + + if (rcv_obj->id < IPI_MAX && ipi_desc[rcv_obj->id].handler) { + memcpy_fromio(tmp_data, &rcv_obj->share_buf, rcv_obj->len); + ipi_desc[rcv_obj->id].handler(&tmp_data[0], + rcv_obj->len, + ipi_desc[rcv_obj->id].priv); + scp->ipi_id_ack[rcv_obj->id] = true; + wake_up(&scp->ack_wq); + } else { + dev_err(scp->dev, "No such ipi id = %d\n", rcv_obj->id); + } +} + +static int scp_ipi_init(struct mtk_scp *scp) +{ + size_t send_offset = 0x800 - sizeof(struct share_obj); + size_t recv_offset = send_offset - sizeof(struct share_obj); + + /* Disable SCP to host interrupt */ + writel(MT8183_SCP_IPC_INT_BIT, scp->reg_base + MT8183_SCP_TO_HOST); + + /* shared buffer initialization */ + scp->recv_buf = (__force struct share_obj *)(scp->sram_base + + recv_offset); + scp->send_buf = (__force struct share_obj *)(scp->sram_base + + send_offset); + memset_io(scp->recv_buf, 0, sizeof(scp->recv_buf)); + memset_io(scp->send_buf, 0, sizeof(scp->send_buf)); + + return 0; +} + +static irqreturn_t scp_irq_handler(int irq, void *priv) +{ + struct mtk_scp *scp = priv; + 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 { + dev_err(scp->dev, "scp watchdog timeout! 0x%x", scp_to_host); + scp_wdt_handler(scp); + } + + /* 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); + + return IRQ_HANDLED; +} + +static int mtk_scp_load(struct rproc *rproc, const struct firmware *fw) +{ + const 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; + } + + writel(0x0, scp->reg_base + MT8183_SCP_SRAM_PDN); + + memcpy(scp->sram_base, fw->data, fw->size); + return ret; +} + +static int mtk_scp_start(struct rproc *rproc) +{ + struct mtk_scp *scp = (struct mtk_scp *)rproc->priv; + struct device *dev = scp->dev; + struct scp_run *run; + u32 val; + int ret; + + ret = clk_prepare_enable(scp->clk); + if (ret) { + dev_err(dev, "failed to enable clocks\n"); + return ret; + } + + val = readl(scp->reg_base + MT8183_SW_RSTN); + val |= MT8183_SW_RSTN_BIT; + writel(val, scp->reg_base + MT8183_SW_RSTN); + + run = &scp->run; + + ret = wait_event_interruptible_timeout( + run->wq, + run->signaled, + msecs_to_jiffies(INIT_TIMEOUT_MS)); + + if (ret == 0) { + dev_err(dev, "wait scp initialization timeout!\n"); + return -ETIME; + } + if (ret == -ERESTARTSYS) { + dev_err(dev, "wait scp interrupted by a signal!\n"); + return -ERESTARTSYS; + } + dev_info(dev, "scp is ready. Fw version %s\n", run->fw_ver); + + return 0; +} + +static void *mtk_scp_da_to_va(struct rproc *rproc, u64 da, int len) +{ + struct mtk_scp *scp = (struct mtk_scp *)rproc->priv; + int offset; + + if (da < scp->sram_size) { + offset = da; + if (offset >= 0 && ((offset + len) < scp->sram_size)) { + return (__force void *)(scp->sram_base + offset); + } + } else if (da >= scp->sram_size && da < (scp->sram_size + MAX_CODE_SIZE)) { + offset = da - scp->sram_size; + if (offset >= 0 && (offset + len) < MAX_CODE_SIZE) { + return scp->cpu_addr + offset; + } + } else { + offset = da - scp->phys_addr; + if (offset >= 0 && (offset + len) < (scp->dram_size - MAX_CODE_SIZE)) { + return scp->cpu_addr + offset; + } + } + + return NULL; +} + +static int mtk_scp_stop(struct rproc *rproc) +{ + struct mtk_scp *scp = (struct mtk_scp *)rproc->priv; + u32 val; + + val = readl(scp->reg_base + MT8183_SW_RSTN); + val &= ~MT8183_SW_RSTN_BIT; + writel(val, scp->reg_base + MT8183_SW_RSTN); + + clk_disable_unprepare(scp->clk); + + return 0; +} + +static const struct rproc_ops mtk_scp_ops = { + .start = mtk_scp_start, + .stop = mtk_scp_stop, + .load = mtk_scp_load, + .da_to_va = mtk_scp_da_to_va, +}; + +unsigned int scp_get_vdec_hw_capa(struct platform_device *pdev) +{ + struct mtk_scp *scp = platform_get_drvdata(pdev); + + return scp->run.dec_capability; +} +EXPORT_SYMBOL_GPL(scp_get_vdec_hw_capa); + +unsigned int scp_get_venc_hw_capa(struct platform_device *pdev) +{ + struct mtk_scp *scp = platform_get_drvdata(pdev); + + return scp->run.enc_capability; +} +EXPORT_SYMBOL_GPL(scp_get_venc_hw_capa); + +void *scp_mapping_dm_addr(struct platform_device *pdev, u32 mem_addr) +{ + struct mtk_scp *scp = platform_get_drvdata(pdev); + void *ptr = NULL; + + ptr = mtk_scp_da_to_va(scp->rproc, mem_addr, 0); + + if (ptr) + return ptr; + else + return ERR_PTR(-EINVAL); +} +EXPORT_SYMBOL_GPL(scp_mapping_dm_addr); + +static int scp_map_memory_region(struct mtk_scp *scp) +{ + struct device_node *node; + struct resource r; + int ret; + + node = of_parse_phandle(scp->dev->of_node, "memory-region", 0); + if (!node) { + dev_err(scp->dev, "no memory-region specified\n"); + return -EINVAL; + } + + ret = of_address_to_resource(node, 0, &r); + if (ret) + return ret; + + scp->phys_addr = r.start; + scp->dram_size = resource_size(&r); + scp->cpu_addr = devm_ioremap_wc(scp->dev, scp->phys_addr, scp->dram_size); + + if (!scp->cpu_addr) { + dev_err(scp->dev, "unable to map memory region: %pa+%zx\n", + &r.start, scp->dram_size); + return -EBUSY; + } + + return 0; +} + +static int mtk_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; + char *fw_name = "scp.img"; + int ret; + + rproc = rproc_alloc(dev, + np->name, + &mtk_scp_ops, + fw_name, + sizeof(*scp)); + if (!rproc) { + dev_err(dev, "unable to allocate remoteproc\n"); + return -ENOMEM; + } + + scp = (struct mtk_scp *)rproc->priv; + scp->rproc = rproc; + scp->dev = dev; + platform_set_drvdata(pdev, scp); + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "sram"); + scp->sram_base = devm_ioremap_resource(dev, res); + scp->sram_size = resource_size(res); + if (IS_ERR((__force void *)scp->sram_base)) { + dev_err(dev, "Failed to parse and map sram memory\n"); + ret = PTR_ERR((__force void *)scp->sram_base); + goto free_rproc; + } + + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "cfg"); + scp->reg_base = devm_ioremap_resource(dev, res); + if (IS_ERR((__force void *)scp->reg_base)) { + dev_err(dev, "Failed to parse and map cfg memory\n"); + ret = PTR_ERR((__force void *)scp->reg_base); + goto free_rproc; + } + + ret = scp_map_memory_region(scp); + if (ret) + goto free_rproc; + + 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); + goto free_rproc; + } + + ret = clk_prepare_enable(scp->clk); + if (ret) { + dev_err(dev, "failed to enable clocks\n"); + goto free_rproc; + } + + ret = scp_ipi_init(scp); + clk_disable_unprepare(scp->clk); + if (ret) { + dev_err(dev, "Failed to init ipi\n"); + goto free_rproc; + } + + /* register scp initialization IPI */ + ret = scp_ipi_register(pdev, + IPI_SCP_INIT, + scp_init_ipi_handler, + "scp_init", + scp); + if (ret) { + dev_err(dev, "Failed to register IPI_SCP_INIT\n"); + goto free_rproc; + } + + ret = devm_request_irq(dev, + platform_get_irq(pdev, 0), + scp_irq_handler, + 0, + pdev->name, + scp); + + if (ret) { + dev_err(dev, "failed to request irq\n"); + goto free_rproc; + } + + mutex_init(&scp->scp_mutex); + + init_waitqueue_head(&scp->run.wq); + init_waitqueue_head(&scp->ack_wq); + + ret = rproc_add(rproc); + if (ret) + goto destroy_mutex; + + return ret; + +destroy_mutex: + mutex_destroy(&scp->scp_mutex); +free_rproc: + rproc_free(rproc); + + return ret; +} + +static int mtk_scp_remove(struct platform_device *pdev) +{ + struct mtk_scp *scp = platform_get_drvdata(pdev); + + rproc_del(scp->rproc); + rproc_free(scp->rproc); + + return 0; +} + +static const struct of_device_id mtk_scp_of_match[] = { + { .compatible = "mediatek,mt8183-scp"}, + {}, +}; +MODULE_DEVICE_TABLE(of, mtk_scp_of_match); + +static struct platform_driver mtk_scp_driver = { + .probe = mtk_scp_probe, + .remove = mtk_scp_remove, + .driver = { + .name = "mtk-scp", + .of_match_table = of_match_ptr(mtk_scp_of_match), + }, +}; + +module_platform_driver(mtk_scp_driver); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("MediaTek scp control driver"); diff --git a/include/linux/platform_data/mtk_scp.h b/include/linux/platform_data/mtk_scp.h new file mode 100644 index 0000000000000..118838c91564f --- /dev/null +++ b/include/linux/platform_data/mtk_scp.h @@ -0,0 +1,136 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2018 MediaTek Inc. + */ + +#ifndef _MTK_SCP_H +#define _MTK_SCP_H + +#include + +typedef void (*ipi_handler_t) (void *data, + unsigned int len, + void *priv); + +/** + * enum ipi_id - the id of inter-processor interrupt + * + * @IPI_SCP_INIT: The interrupt from scp is to notfiy kernel + * SCP initialization completed. + * IPI_SCP_INIT is sent from SCP when firmware is + * loaded. AP doesn't need to send IPI_SCP_INIT + * command to SCP. + * For other IPI below, AP should send the request + * to SCP to trigger the interrupt. + * @IPI_MAX: The maximum IPI number + */ + +enum ipi_id { + IPI_SCP_INIT = 0, + IPI_MDP, + IPI_MAX, +}; + +/** + * enum rst_id - reset id to register reset function for SCP watchdog timeout + * + * @SCP_RST_ENC: encoder reset id + * @SCP_RST_DEC: decoder reset id + * @SCP_RST_MDP: MDP (Media Data Path) reset id + * @SCP_RST_MAX: maximum reset id + */ +enum rst_id { + SCP_RST_ENC, + SCP_RST_DEC, + SCP_RST_MDP, + SCP_RST_MAX, +}; + +/** + * scp_ipi_register - register an ipi function + * + * @pdev: SCP platform device + * @id: IPI ID + * @handler: IPI handler + * @name: IPI name + * @priv: private data for IPI handler + * + * Register an ipi function to receive ipi interrupt from SCP. + * + * Return: Return 0 if ipi registers successfully, otherwise it is failed. + */ +int scp_ipi_register(struct platform_device *pdev, + enum ipi_id id, + ipi_handler_t handler, + const char *name, + void *priv); + +/** + * scp_ipi_send - send data from AP to scp. + * + * @pdev: SCP platform device + * @id: IPI ID + * @buf: the data buffer + * @len: the data buffer length + * @wait: 1: need ack + * + * This function is thread-safe. When this function returns, + * SCP has received the data and starts the processing. + * When the processing completes, IPI handler registered + * by scp_ipi_register will be called in interrupt context. + * + * Return: Return 0 if sending data successfully, otherwise it is failed. + **/ +int scp_ipi_send(struct platform_device *pdev, + enum ipi_id id, + void *buf, + unsigned int len, + unsigned int wait); + +/** + * scp_get_plat_device - get SCP's platform device + * + * @pdev: the platform device of the module requesting SCP platform + * device for using SCP API. + * + * Return: Return NULL if it is failed. + * otherwise it is SCP's platform device + **/ +struct platform_device *scp_get_plat_device(struct platform_device *pdev); + +/** + * scp_get_vdec_hw_capa - get video decoder hardware capability + * + * @pdev: SCP platform device + * + * Return: video decoder hardware capability + **/ +unsigned int scp_get_vdec_hw_capa(struct platform_device *pdev); + +/** + * scp_get_venc_hw_capa - get video encoder hardware capability + * + * @pdev: SCP platform device + * + * Return: video encoder hardware capability + **/ +unsigned int scp_get_venc_hw_capa(struct platform_device *pdev); + +/** + * scp_mapping_dm_addr - Mapping SRAM/DRAM to kernel virtual address + * + * @pdev: SCP platform device + * @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 platform_device *pdev, + u32 mem_addr); + +#endif /* _MTK_SCP_H */