diff options
Diffstat (limited to 'drivers/remoteproc/mtk_scp.c')
| -rw-r--r-- | drivers/remoteproc/mtk_scp.c | 610 |
1 files changed, 610 insertions, 0 deletions
diff --git a/drivers/remoteproc/mtk_scp.c b/drivers/remoteproc/mtk_scp.c new file mode 100644 index 000000000000..dc5babb3af59 --- /dev/null +++ b/drivers/remoteproc/mtk_scp.c @@ -0,0 +1,610 @@ +// 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 "mtk_common.h" +#include "remoteproc_internal.h" + +#define MAX_CODE_SIZE 0x500000 +#define SCP_FW_END 0x7C000 + +/** + * 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_ipi_init(struct mtk_scp *scp) +{ + size_t send_offset = SCP_FW_END - sizeof(struct mtk_share_obj); + size_t recv_offset = send_offset - sizeof(struct mtk_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 = + (struct mtk_share_obj __iomem *)(scp->sram_base + recv_offset); + scp->send_buf = + (struct mtk_share_obj __iomem *)(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); + + /* 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 = (void __iomem *)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 (void __force *)scp->sram_base + offset; + } else { + offset = da - scp->phys_addr; + if (offset >= 0 && (offset + len) < scp->dram_size) + return (void __force *)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, +}; + +/** + * 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); + 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); + 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->phys_addr, GFP_KERNEL); + if (!scp->cpu_addr) + return -ENOMEM; + + return 0; +} + +static void scp_unmap_memory_region(struct mtk_scp *scp) +{ + dma_free_coherent(scp->dev, scp->dram_size, scp->cpu_addr, + scp->phys_addr); + of_reserved_mem_device_release(scp->dev); +} + +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, i; + + 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); + + mutex_init(&scp->send_lock); + for (i = 0; i < SCP_IPI_MAX; i++) + mutex_init(&scp->ipi_desc[i].lock); + + 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 destroy_mutex; + } + + ret = scp_map_memory_region(scp); + if (ret) + goto destroy_mutex; + + 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 release_dev_mem; + } + + ret = clk_prepare_enable(scp->clk); + if (ret) { + dev_err(dev, "failed to enable clocks\n"); + goto release_dev_mem; + } + + ret = scp_ipi_init(scp); + clk_disable_unprepare(scp->clk); + if (ret) { + dev_err(dev, "Failed to init ipi\n"); + goto release_dev_mem; + } + + /* 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); + + 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 unregister_ipi; + } + + ret = rproc_add(rproc); + if (ret) + goto unregister_ipi; + + return ret; + +unregister_ipi: + scp_ipi_unregister(scp, SCP_IPI_INIT); +release_dev_mem: + scp_unmap_memory_region(scp); +destroy_mutex: + for (i = 0; i < SCP_IPI_MAX; i++) + mutex_destroy(&scp->ipi_desc[i].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); + int i; + + rproc_del(scp->rproc); + 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); + 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"); |