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Changes from v14: - No change. Changes from v13: - Move include/linux/platform_data/mtk_scp.h to include/linux/remoteproc/mtk_scp.h. - Add lock for access of scp->ipi_desc. - Lock the whole ipi_send function. - Move more setting of cache size from SCP firmware to kernel driver, to prevent problem while loading firmware onto DRAM. - Cleanup and remove unused branch in scp_da_to_va. - Minor fixes addressing comment. Changes from v12: - Initialize cache before firmware load, to avoid problem while loading large firmware. - Disable watchdog before stopping SCP, to avoid extra warning message. - Use strscpy instead of strncpy. Changes from v11: - No change. Changes from v10: - Add a clock reset before loading firmware. Changes from v9: - No change. Changes from v8: - Add a missing space. Changes from v7: - Moved the location of shared SCP buffer. - Fix clock enable/disable sequence. - Add more IPI ID that would be used. Changes from v6: - No change. Changes from v5: - Changed some space to tab. Changes from v4: - Rename most function from mtk_scp_* to scp_*. - Change the irq to threaded handler. - Load ELF file instead of plain binary file as firmware by default (Squashed patch 6 in v4 into this patch). Changes from v3: - Fix some issue found by checkpatch. - Make writes aligned in scp_ipi_send. Changes from v2: - Squash patch 3 from v2 (separate the ipi interface) into this patch. - Remove unused name argument from scp_ipi_register. - Add scp_ipi_unregister for proper cleanup. - Move IPI ids in sync with firmware. - Add mb() in proper place, and correctly clear the run->signaled. Changes from v1: - Extract functions and rename variables in mtk_scp.c. --- drivers/remoteproc/Kconfig | 9 + drivers/remoteproc/Makefile | 1 + drivers/remoteproc/mtk_common.h | 90 +++++ drivers/remoteproc/mtk_scp.c | 535 +++++++++++++++++++++++++++++ drivers/remoteproc/mtk_scp_ipi.c | 160 +++++++++ include/linux/remoteproc/mtk_scp.h | 141 ++++++++ 6 files changed, 936 insertions(+) create mode 100644 drivers/remoteproc/mtk_common.h create mode 100644 drivers/remoteproc/mtk_scp.c create mode 100644 drivers/remoteproc/mtk_scp_ipi.c create mode 100644 include/linux/remoteproc/mtk_scp.h diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig index 28ed306982f7..ea71cad399f7 100644 --- a/drivers/remoteproc/Kconfig +++ b/drivers/remoteproc/Kconfig @@ -23,6 +23,15 @@ 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 System Companion Processor (SCP) 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 00f09e658cb3..e30a1b15fbac 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 mtk_scp_ipi.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_common.h b/drivers/remoteproc/mtk_common.h new file mode 100644 index 000000000000..e213039543ec --- /dev/null +++ b/drivers/remoteproc/mtk_common.h @@ -0,0 +1,90 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2019 MediaTek Inc. + */ + +#ifndef __RPROC_MTK_COMMON_H +#define __RPROC_MTK_COMMON_H + +#include +#include +#include +#include + +#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_WDT_CFG 0x84 +#define MT8183_SCP_CLK_SW_SEL 0x4000 +#define MT8183_SCP_CLK_DIV_SEL 0x4024 +#define MT8183_SCP_SRAM_PDN 0x402C +#define MT8183_SCP_L1_SRAM_PD 0x4080 +#define MT8183_SCP_TCM_TAIL_SRAM_PD 0x4094 + +#define MT8183_SCP_CACHE_SEL(x) (0x14000 + (x) * 0x3000) +#define MT8183_SCP_CACHE_CON MT8183_SCP_CACHE_SEL(0) +#define MT8183_SCP_DCACHE_CON MT8183_SCP_CACHE_SEL(1) +#define MT8183_SCP_CACHESIZE_8KB BIT(8) +#define MT8183_SCP_CACHE_CON_WAYEN BIT(10) + +#define SCP_FW_VER_LEN 32 +#define SCP_SHARE_BUFFER_SIZE 288 + +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 { + scp_ipi_handler_t handler; + 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; + /* To prevent multiple ipi_send run concurrently. */ + struct mutex send_lock; + /* For protecting ipi_desc field. */ + struct mutex desc_lock; + struct scp_ipi_desc ipi_desc[SCP_IPI_MAX]; + bool ipi_id_ack[SCP_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 { + u32 id; + u32 len; + u8 share_buf[SCP_SHARE_BUFFER_SIZE]; +}; + +void scp_memcpy_aligned(void *dst, const void *src, unsigned int len); + +#endif diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c new file mode 100644 index 000000000000..2e4fa3e41f84 --- /dev/null +++ b/drivers/remoteproc/mtk_scp.c @@ -0,0 +1,535 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Copyright (c) 2019 MediaTek Inc. + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "mtk_common.h" +#include "remoteproc_internal.h" + +#define MAX_CODE_SIZE 0x500000 +#define SCP_FW_END 0x7C000 + +struct platform_device *scp_get_pdev(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_pdev); + +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 share_obj *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; + + if (rcv_obj->len > SCP_SHARE_BUFFER_SIZE) { + dev_err(scp->dev, "ipi message too long (len %d, max %d)", + rcv_obj->len, SCP_SHARE_BUFFER_SIZE); + return; + } + mutex_lock(&scp->desc_lock); + handler = ipi_desc[rcv_obj->id].handler; + mutex_unlock(&scp->desc_lock); + if (rcv_obj->id >= SCP_IPI_MAX || !handler) { + dev_err(scp->dev, "No such ipi id = %d\n", rcv_obj->id); + return; + } + + memcpy_fromio(tmp_data, &rcv_obj->share_buf, rcv_obj->len); + handler(tmp_data, rcv_obj->len, ipi_desc[rcv_obj->id].priv); + scp->ipi_id_ack[rcv_obj->id] = true; + wake_up(&scp->ack_wq); +} + +static int scp_ipi_init(struct mtk_scp *scp) +{ + size_t send_offset = SCP_FW_END - 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 void scp_reset_assert(const 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 scp_reset_deassert(const 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 irqreturn_t scp_irq_handler(int irq, void *priv) +{ + struct mtk_scp *scp = priv; + u32 scp_to_host; + int ret; + + ret = clk_prepare_enable(scp->clk); + if (ret) { + dev_err(scp->dev, "failed to enable clocks\n"); + return IRQ_NONE; + } + + 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); + + /* + * Ensure that all writes to SRAM are committed before another + * interrupt. + */ + mb(); + /* 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); + 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; + + if (phdr->p_type != PT_LOAD) + continue; + + dev_dbg(dev, "phdr: type %d da 0x%x memsz 0x%x filesz 0x%x\n", + phdr->p_type, da, memsz, filesz); + + 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 = rproc_da_to_va(rproc, da, memsz); + 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 */ + if (phdr->p_filesz) + scp_memcpy_aligned(ptr, elf_data + phdr->p_offset, + filesz); + } + + return ret; +} + +static int 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; + } + + /* Hold SCP in reset while loading FW. */ + scp_reset_assert(scp); + + /* 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); + + ret = scp_elf_load_segments(rproc, 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_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_reset_assert(scp); + clk_disable_unprepare(scp->clk); + return ret; +} + +static void *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 scp->sram_base + offset; + } else { + offset = da - scp->phys_addr; + if (offset >= 0 && (offset + len) < scp->dram_size) + return scp->cpu_addr + offset; + } + + return NULL; +} + +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_reset_assert(scp); + /* Disable SCP watchdog */ + writel(0, scp->reg_base + MT8183_WDT_CFG); + 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, +}; + +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; + + ptr = scp_da_to_va(scp->rproc, mem_addr, 0); + 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) +{ + 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 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, + &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); + 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; + } + scp->sram_size = resource_size(res); + + 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, + SCP_IPI_INIT, + scp_init_ipi_handler, + scp); + if (ret) { + dev_err(dev, "Failed to register IPI_SCP_INIT\n"); + goto free_rproc; + } + + mutex_init(&scp->send_lock); + mutex_init(&scp->desc_lock); + + init_waitqueue_head(&scp->run.wq); + init_waitqueue_head(&scp->ack_wq); + + 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 destroy_mutex; + } + + ret = rproc_add(rproc); + if (ret) + goto destroy_mutex; + + return ret; + +destroy_mutex: + mutex_destroy(&scp->desc_lock); + mutex_destroy(&scp->send_lock); +free_rproc: + rproc_free(rproc); + + return ret; +} + +static int scp_remove(struct platform_device *pdev) +{ + struct mtk_scp *scp = platform_get_drvdata(pdev); + + mutex_destroy(&scp->desc_lock); + mutex_destroy(&scp->send_lock); + 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 = scp_probe, + .remove = 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/drivers/remoteproc/mtk_scp_ipi.c b/drivers/remoteproc/mtk_scp_ipi.c new file mode 100644 index 000000000000..1bff5567df8e --- /dev/null +++ b/drivers/remoteproc/mtk_scp_ipi.c @@ -0,0 +1,160 @@ +// SPDX-License-Identifier: GPL-2.0 +// +// Copyright (c) 2019 MediaTek Inc. + +#include +#include +#include +#include +#include +#include +#include + +#include "mtk_common.h" + +int scp_ipi_register(struct platform_device *pdev, + enum scp_ipi_id id, + scp_ipi_handler_t handler, + void *priv) +{ + struct mtk_scp *scp = platform_get_drvdata(pdev); + + if (!scp) { + dev_err(&pdev->dev, "scp device is not ready\n"); + return -EPROBE_DEFER; + } + + if (WARN_ON(id < 0) || WARN_ON(id >= SCP_IPI_MAX) || + WARN_ON(handler == NULL)) + return -EINVAL; + + mutex_lock(&scp->desc_lock); + scp->ipi_desc[id].handler = handler; + scp->ipi_desc[id].priv = priv; + mutex_unlock(&scp->desc_lock); + + return 0; +} +EXPORT_SYMBOL_GPL(scp_ipi_register); + +void scp_ipi_unregister(struct platform_device *pdev, enum scp_ipi_id id) +{ + struct mtk_scp *scp = platform_get_drvdata(pdev); + + if (!scp) + return; + + if (WARN_ON(id < 0) || WARN_ON(id >= SCP_IPI_MAX)) + return; + + mutex_lock(&scp->desc_lock); + scp->ipi_desc[id].handler = NULL; + scp->ipi_desc[id].priv = NULL; + mutex_unlock(&scp->desc_lock); +} +EXPORT_SYMBOL_GPL(scp_ipi_unregister); + +/* + * Copy src to dst, where dst is in SCP SRAM region. + * Since AP access of SCP SRAM don't support byte write, this always write a + * full word at a time, and may cause some extra bytes to be written at the + * beginning & ending of dst. + */ +void scp_memcpy_aligned(void *dst, const void *src, unsigned int len) +{ + void *ptr; + u32 val; + unsigned int i = 0; + + if (!IS_ALIGNED((unsigned long)dst, 4)) { + ptr = (void *)ALIGN_DOWN((unsigned long)dst, 4); + i = 4 - (dst - ptr); + val = readl_relaxed(ptr); + memcpy((u8 *)&val + (4 - i), src, i); + writel_relaxed(val, ptr); + } + + while (i + 4 <= len) { + val = *((u32 *)(src + i)); + writel_relaxed(val, dst + i); + i += 4; + } + if (i < len) { + val = readl_relaxed(dst + i); + memcpy(&val, src + i, len - i); + writel_relaxed(val, dst + i); + } +} +EXPORT_SYMBOL_GPL(scp_memcpy_aligned); + +int scp_ipi_send(struct platform_device *pdev, + enum scp_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_ON(id <= SCP_IPI_INIT) || WARN_ON(id >= SCP_IPI_MAX) || + WARN_ON(len > sizeof(send_obj->share_buf)) || WARN_ON(!buf)) + return -EINVAL; + + mutex_lock(&scp->send_lock); + + ret = clk_prepare_enable(scp->clk); + if (ret) { + dev_err(scp->dev, "failed to enable clock\n"); + goto unlock_mutex; + } + + /* Wait until SCP receives the last command */ + timeout = jiffies + msecs_to_jiffies(2000); + do { + if (time_after(jiffies, timeout)) { + dev_err(scp->dev, "%s: IPI timeout!\n", __func__); + ret = -ETIMEDOUT; + goto clock_disable; + } + } while (readl(scp->reg_base + MT8183_HOST_TO_SCP)); + + scp_memcpy_aligned(send_obj->share_buf, buf, len); + + send_obj->len = len; + send_obj->id = id; + + scp->ipi_id_ack[id] = false; + /* + * Ensure that all writes to SRAM are committed before sending the + * interrupt to SCP. + */ + mb(); + /* send the command to SCP */ + writel(MT8183_HOST_IPC_INT_BIT, scp->reg_base + MT8183_HOST_TO_SCP); + + 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); +unlock_mutex: + mutex_unlock(&scp->send_lock); + + return ret; +} +EXPORT_SYMBOL_GPL(scp_ipi_send); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("MediaTek scp IPI interface"); diff --git a/include/linux/remoteproc/mtk_scp.h b/include/linux/remoteproc/mtk_scp.h new file mode 100644 index 000000000000..b80d8e3f7959 --- /dev/null +++ b/include/linux/remoteproc/mtk_scp.h @@ -0,0 +1,141 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (c) 2019 MediaTek Inc. + */ + +#ifndef _MTK_SCP_H +#define _MTK_SCP_H + +#include + +typedef void (*scp_ipi_handler_t) (void *data, + unsigned int len, + void *priv); + +/** + * enum ipi_id - the id of inter-processor interrupt + * + * @SCP_IPI_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. + * @SCP_IPI_MAX: The maximum IPI number + */ + +enum scp_ipi_id { + SCP_IPI_INIT = 0, + SCP_IPI_VDEC_H264, + SCP_IPI_VDEC_VP8, + SCP_IPI_VDEC_VP9, + SCP_IPI_VENC_H264, + SCP_IPI_VENC_VP8, + SCP_IPI_MDP_INIT, + SCP_IPI_MDP_DEINIT, + SCP_IPI_MDP_FRAME, + SCP_IPI_DIP, + SCP_IPI_ISP_CMD, + SCP_IPI_ISP_FRAME, + SCP_IPI_FD_CMD, + SCP_IPI_CROS_HOST_CMD, + SCP_IPI_MAX, +}; + +/** + * scp_ipi_register - register an ipi function + * + * @pdev: SCP platform device + * @id: IPI ID + * @handler: IPI handler + * @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 scp_ipi_id id, + scp_ipi_handler_t handler, + void *priv); + +/** + * scp_ipi_unregister - unregister an ipi function + * + * @pdev: SCP platform device + * @id: IPI ID + * + * Unregister an ipi function to receive ipi interrupt from SCP. + */ +void scp_ipi_unregister(struct platform_device *pdev, enum scp_ipi_id id); + +/** + * 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 scp_ipi_id id, + void *buf, + unsigned int len, + unsigned int wait); + +/** + * scp_get_pdev - 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_pdev(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 */