[RFC, v3 9/9] media: platform: Add Mediatek ISP P1 shared memory device

Jungo Lin
2019-06-11T03:53:44Z

The purpose of this child device is to provide shared
memory management for exchanging tuning data between co-processor
and the Pass 1 unit of the camera ISP system, including cache
buffer handling.

Signed-off-by: Jungo Lin <jungo.lin@mediatek.com>
---
This patch depends on "Add support for mt8183 SCP"[1].

[1] https://patchwork.kernel.org/cover/10972143/
---
.../platform/mtk-isp/isp_50/cam/Makefile | 1 +
.../mtk-isp/isp_50/cam/mtk_cam-smem.c | 304 ++++++++++++++++++
.../mtk-isp/isp_50/cam/mtk_cam-smem.h | 18 ++
3 files changed, 323 insertions(+)
create mode 100644 drivers/media/platform/mtk-isp/isp_50/cam/mtk_cam-smem.c
create mode 100644 drivers/media/platform/mtk-isp/isp_50/cam/mtk_cam-smem.h

diff --git a/drivers/media/platform/mtk-isp/isp_50/cam/Makefile b/drivers/media/platform/mtk-isp/isp_50/cam/Makefile
index 95f0b1c8fa1c..d545ca6f09c5 100644
--- a/drivers/media/platform/mtk-isp/isp_50/cam/Makefile
+++ b/drivers/media/platform/mtk-isp/isp_50/cam/Makefile
@@ -4,5 +4,6 @@ mtk-cam-isp-objs += mtk_cam-ctrl.o
mtk-cam-isp-objs += mtk_cam-v4l2-util.o
mtk-cam-isp-objs += mtk_cam.o
mtk-cam-isp-objs += mtk_cam-scp.o
+mtk-cam-isp-objs += mtk_cam-smem.o

obj-$(CONFIG_VIDEO_MEDIATEK_ISP_PASS1) += mtk-cam-isp.o
\ No newline at end of file
diff --git a/drivers/media/platform/mtk-isp/isp_50/cam/mtk_cam-smem.c b/drivers/media/platform/mtk-isp/isp_50/cam/mtk_cam-smem.c
new file mode 100644
index 000000000000..a9845668ce10
--- /dev/null
+++ b/drivers/media/platform/mtk-isp/isp_50/cam/mtk_cam-smem.c
@@ -0,0 +1,304 @@
+// SPDX-License-Identifier: GPL-2.0
+//
+// Copyright (c) 2018 MediaTek Inc.
+
+#include <asm/cacheflush.h>
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/iommu.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+#include <linux/of_reserved_mem.h>
+#include <linux/platform_device.h>
+#include <linux/platform_data/mtk_scp.h>
+#include <media/videobuf2-dma-contig.h>
+
+#include "mtk_cam-smem.h"
+
+static struct dma_map_ops smem_dma_ops;
+
+struct mtk_cam_smem_dev {
+ struct device *dev;
+ struct sg_table sgt;
+ struct page **smem_pages;
+ dma_addr_t smem_base;
+ dma_addr_t smem_dma_base;
+ int smem_size;
+};
+
+struct dma_coherent_mem {
+ void *virt_base;
+ dma_addr_t device_base;
+ unsigned long pfn_base;
+ int size;
+ int flags;
+ unsigned long *bitmap;
+ spinlock_t spinlock; /* dma_coherent_mem attributes protection */
+ bool use_dev_dma_pfn_offset;
+};
+
+dma_addr_t mtk_cam_smem_iova_to_scp_addr(struct device *dev,
+ dma_addr_t iova)
+{
+ struct iommu_domain *domain;
+ dma_addr_t addr, limit;
+ struct mtk_cam_smem_dev *smem_dev = dev_get_drvdata(dev);
+
+ domain = iommu_get_domain_for_dev(dev);
+ if (!domain) {
+ dev_warn(dev, "No iommu group domain\n");
+ return 0;
+ }
+
+ addr = iommu_iova_to_phys(domain, iova);
+ limit = smem_dev->smem_base + smem_dev->smem_size;
+ if (addr < smem_dev->smem_base || addr >= limit) {
+ dev_err(dev,
+ "Unexpected scp_addr:%pad must >= %pad and < %pad)\n",
+ &addr, &smem_dev->smem_base, &limit);
+ return 0;
+ }
+ return addr;
+}
+
+static int mtk_cam_smem_get_sgtable(struct device *dev,
+ struct sg_table *sgt,
+ void *cpu_addr, dma_addr_t dma_addr,
+ size_t size, unsigned long attrs)
+{
+ struct mtk_cam_smem_dev *smem_dev = dev_get_drvdata(dev);
+ size_t pages_count = PAGE_ALIGN(size) >> PAGE_SHIFT;
+ dma_addr_t scp_addr = mtk_cam_smem_iova_to_scp_addr(dev, dma_addr);
+ u32 pages_start = (scp_addr - smem_dev->smem_base) >> PAGE_SHIFT;
+
+ dev_dbg(dev,
+ "%s:page:%u va:%pK scp addr:%pad, aligned size:%zu pages:%zu\n",
+ __func__, pages_start, cpu_addr, &scp_addr, size, pages_count);
+
+ return sg_alloc_table_from_pages(sgt,
+ smem_dev->smem_pages + pages_start,
+ pages_count, 0, size, GFP_KERNEL);
+}
+
+static void *mtk_cam_smem_get_cpu_addr(struct mtk_cam_smem_dev *smem_dev,
+ dma_addr_t addr)
+{
+ struct device *dev = smem_dev->dev;
+ struct dma_coherent_mem *dma_mem = dev->dma_mem;
+
+ if (addr < smem_dev->smem_base ||
+ addr > smem_dev->smem_base + smem_dev->smem_size) {
+ dev_err(dev, "Invalid scp_addr %pad from sg\n", &addr);
+ return NULL;
+ }
+ return dma_mem->virt_base + (addr - smem_dev->smem_base);
+}
+
+static void mtk_cam_smem_sync_sg_for_cpu(struct device *dev,
+ struct scatterlist *sgl, int nelems,
+ enum dma_data_direction dir)
+{
+ struct mtk_cam_smem_dev *smem_dev = dev_get_drvdata(dev);
+ dma_addr_t scp_addr = sg_phys(sgl);
+ void *cpu_addr = mtk_cam_smem_get_cpu_addr(smem_dev, scp_addr);
+
+ dev_dbg(dev,
+ "__dma_unmap_area:scp_addr:%pad,vaddr:%pK,size:%d,dir:%d\n",
+ &scp_addr, cpu_addr, sgl->length, dir);
+ __dma_unmap_area(cpu_addr, sgl->length, dir);
+}
+
+static void mtk_cam_smem_sync_sg_for_device(struct device *dev,
+ struct scatterlist *sgl,
+ int nelems,
+ enum dma_data_direction dir)
+{
+ struct mtk_cam_smem_dev *smem_dev = dev_get_drvdata(dev);
+ dma_addr_t scp_addr = sg_phys(sgl);
+ void *cpu_addr = mtk_cam_smem_get_cpu_addr(smem_dev, scp_addr);
+
+ dev_dbg(dev,
+ "__dma_map_area:scp_addr:%pad,vaddr:%pK,size:%d,dir:%d\n",
+ &scp_addr, cpu_addr, sgl->length, dir);
+ __dma_map_area(cpu_addr, sgl->length, dir);
+}
+
+static void mtk_cam_smem_setup_dma_ops(struct device *dev,
+ struct dma_map_ops *smem_ops)
+{
+ memcpy((void *)smem_ops, dev->dma_ops, sizeof(*smem_ops));
+ smem_ops->get_sgtable = mtk_cam_smem_get_sgtable;
+ smem_ops->sync_sg_for_device = mtk_cam_smem_sync_sg_for_device;
+ smem_ops->sync_sg_for_cpu = mtk_cam_smem_sync_sg_for_cpu;
+ set_dma_ops(dev, smem_ops);
+}
+
+static int mtk_cam_reserved_drm_sg_init(struct mtk_cam_smem_dev *smem_dev)
+{
+ u32 size_align, n_pages;
+ struct device *dev = smem_dev->dev;
+ struct sg_table *sgt = &smem_dev->sgt;
+ struct page **pages;
+ dma_addr_t dma_addr;
+ unsigned int i;
+ int ret;
+
+ smem_dev->smem_base = scp_get_reserve_mem_phys(SCP_ISP_MEM2_ID);
+ smem_dev->smem_size = scp_get_reserve_mem_size(SCP_ISP_MEM2_ID);
+ if (!smem_dev->smem_base || !smem_dev->smem_size)
+ return -EPROBE_DEFER;
+
+ dev_info(dev, "%s dev:0x%pK base:%pad size:%u MiB\n",
+ __func__,
+ smem_dev->dev,
+ &smem_dev->smem_base,
+ (smem_dev->smem_size / SZ_1M));
+
+ size_align = PAGE_ALIGN(smem_dev->smem_size);
+ n_pages = size_align >> PAGE_SHIFT;
+
+ pages = kmalloc_array(n_pages, sizeof(struct page *), GFP_KERNEL);
+ if (!pages)
+ return -ENOMEM;
+
+ for (i = 0; i < n_pages; i++)
+ pages[i] = phys_to_page(smem_dev->smem_base + i * PAGE_SIZE);
+
+ ret = sg_alloc_table_from_pages(sgt, pages, n_pages, 0,
+ size_align, GFP_KERNEL);
+ if (ret) {
+ dev_err(dev, "failed to alloca sg table:%d\n", ret);
+ goto fail_table_alloc;
+ }
+ sgt->nents = dma_map_sg_attrs(dev, sgt->sgl, sgt->orig_nents,
+ DMA_BIDIRECTIONAL,
+ DMA_ATTR_SKIP_CPU_SYNC);
+ if (!sgt->nents) {
+ dev_err(dev, "failed to dma sg map\n");
+ goto fail_map;
+ }
+
+ dma_addr = sg_dma_address(sgt->sgl);
+ ret = dma_declare_coherent_memory(dev, smem_dev->smem_base,
+ dma_addr, size_align,
+ DMA_MEMORY_EXCLUSIVE);
+ if (ret) {
+ dev_err(dev, "Unable to declare smem memory:%d\n", ret);
+ goto fail_map;
+ }
+
+ dev_info(dev, "Coherent mem pa:%pad/%pad, size:%d\n",
+ &smem_dev->smem_base, &dma_addr, size_align);
+
+ smem_dev->smem_size = size_align;
+ smem_dev->smem_pages = pages;
+ smem_dev->smem_dma_base = dma_addr;
+
+ return 0;
+
+fail_map:
+ sg_free_table(sgt);
+fail_table_alloc:
+ while (n_pages--)
+ __free_page(pages[n_pages]);
+ kfree(pages);
+
+ return -ENOMEM;
+}
+
+/* DMA memory related helper functions */
+static void mtk_cam_memdev_release(struct device *dev)
+{
+ vb2_dma_contig_clear_max_seg_size(dev);
+}
+
+static struct device *mtk_cam_alloc_smem_dev(struct device *dev,
+ const char *name)
+{
+ struct device *child;
+ int ret;
+
+ child = devm_kzalloc(dev, sizeof(*child), GFP_KERNEL);
+ if (!child)
+ return NULL;
+
+ child->parent = dev;
+ child->iommu_group = dev->iommu_group;
+ child->release = mtk_cam_memdev_release;
+ dev_set_name(child, name);
+ set_dma_ops(child, get_dma_ops(dev));
+ child->dma_mask = dev->dma_mask;
+ ret = dma_set_coherent_mask(child, DMA_BIT_MASK(32));
+ if (ret)
+ return NULL;
+
+ vb2_dma_contig_set_max_seg_size(child, DMA_BIT_MASK(32));
+
+ if (device_register(child)) {
+ device_del(child);
+ return NULL;
+ }
+
+ return child;
+}
+
+static int mtk_cam_composer_dma_init(struct mtk_isp_p1_ctx *isp_ctx)
+{
+ struct isp_p1_device *p1_dev = p1_ctx_to_dev(isp_ctx);
+ struct device *dev = &p1_dev->pdev->dev;
+ u32 size;
+ dma_addr_t addr;
+
+ isp_ctx->scp_mem_pa = scp_get_reserve_mem_phys(SCP_ISP_MEM_ID);
+ size = PAGE_ALIGN(scp_get_reserve_mem_size(SCP_ISP_MEM_ID));
+ if (!isp_ctx->scp_mem_pa || !size)
+ return -EPROBE_DEFER;
+
+ dev_info(dev, "scp addr:%pad size:0x%x\n", &isp_ctx->scp_mem_pa, size);
+
+ /* get iova address */
+ addr = dma_map_page_attrs(dev, phys_to_page(isp_ctx->scp_mem_pa), 0,
+ size, DMA_BIDIRECTIONAL,
+ DMA_ATTR_SKIP_CPU_SYNC);
+ if (dma_mapping_error(dev, addr)) {
+ isp_ctx->scp_mem_pa = 0;
+ dev_err(dev, "Failed to map scp iova\n");
+ return -ENOMEM;
+ }
+
+ isp_ctx->scp_mem_iova = addr;
+
+ return 0;
+}
+
+int mtk_cam_reserved_memory_init(struct isp_p1_device *p1_dev)
+{
+ struct device *dev = &p1_dev->pdev->dev;
+ struct mtk_cam_smem_dev *smem_dev;
+ int ret;
+
+ ret = mtk_cam_composer_dma_init(&p1_dev->isp_ctx);
+ if (ret)
+ return ret;
+
+ /* Allocate context */
+ smem_dev = devm_kzalloc(dev, sizeof(*smem_dev), GFP_KERNEL);
+ if (!smem_dev)
+ return -ENOMEM;
+
+ smem_dev->dev = mtk_cam_alloc_smem_dev(dev, "cam-smem");
+ if (!smem_dev->dev) {
+ dev_err(dev, "failed to alloc smem device\n");
+ return -ENODEV;
+ }
+ dev_set_drvdata(smem_dev->dev, smem_dev);
+ p1_dev->cam_dev.smem_dev = smem_dev->dev;
+
+ ret = mtk_cam_reserved_drm_sg_init(smem_dev);
+ if (ret)
+ return ret;
+
+ mtk_cam_smem_setup_dma_ops(smem_dev->dev, &smem_dma_ops);
+
+ return 0;
+}
diff --git a/drivers/media/platform/mtk-isp/isp_50/cam/mtk_cam-smem.h b/drivers/media/platform/mtk-isp/isp_50/cam/mtk_cam-smem.h
new file mode 100644
index 000000000000..981d47178e99
--- /dev/null
+++ b/drivers/media/platform/mtk-isp/isp_50/cam/mtk_cam-smem.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2018 MediaTek Inc.
+ */
+
+#ifndef __MTK_CAM_ISP_SMEM_H
+#define __MTK_CAM_ISP_SMEM_H
+
+#include <linux/dma-mapping.h>
+
+#include "mtk_cam.h"
+
+int mtk_cam_reserved_memory_init(struct isp_p1_device *p1_dev);
+dma_addr_t mtk_cam_smem_iova_to_scp_addr(struct device *smem_dev,
+ dma_addr_t iova);
+
+#endif
+
--
2.18.0