[RFC V1 12/12] media: platform: Add Mediatek ISP P1 shared memory driver

Jungo Lin
2019-03-28T09:56:47Z

The purpose of this driver is to provide shared memory management
for exchanging tuning data between co-processor and the
Pass 1 unit of the camera ISP system.

Signed-off-by: Jungo Lin <jungo.lin@mediatek.com>
---
.../platform/mtk-isp/isp_50/cam/mtk_cam-smem-drv.c | 398 +++++++++++++++++++++
.../platform/mtk-isp/isp_50/cam/mtk_cam-smem.h | 25 ++
2 files changed, 423 insertions(+)
create mode 100644 drivers/media/platform/mtk-isp/isp_50/cam/mtk_cam-smem-drv.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/mtk_cam-smem-drv.c b/drivers/media/platform/mtk-isp/isp_50/cam/mtk_cam-smem-drv.c
new file mode 100644
index 0000000..9a92080
--- /dev/null
+++ b/drivers/media/platform/mtk-isp/isp_50/cam/mtk_cam-smem-drv.c
@@ -0,0 +1,398 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018 MediaTek Inc.
+ * Author: Frederic Chen <frederic.chen@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/of.h>
+#include <linux/of_fdt.h>
+#include <linux/of_reserved_mem.h>
+#include <linux/dma-contiguous.h>
+#include <linux/dma-mapping.h>
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/iommu.h>
+#include <asm/cacheflush.h>
+
+#define MTK_CAM_SMEM_DEV_NAME "MTK-CAM-SMEM"
+
+struct mtk_cam_smem_drv {
+ struct platform_device *pdev;
+ struct sg_table sgt;
+ struct page **smem_pages;
+ int num_smem_pages;
+ dma_addr_t smem_base;
+ dma_addr_t smem_dma_base;
+ unsigned int smem_size;
+};
+
+/*
+ * MTK CAM SMEM DMA ops
+ */
+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;
+};
+
+static struct reserved_mem *isp_reserved_smem;
+
+dma_addr_t mtk_cam_smem_iova_to_scp_addr(struct device *dev,
+ dma_addr_t iova)
+{
+ struct iommu_domain *smem_dom;
+ dma_addr_t addr;
+ dma_addr_t limit;
+ struct mtk_cam_smem_drv *smem_dev =
+ dev_get_drvdata(dev);
+
+ smem_dom = iommu_get_domain_for_dev(dev);
+ if (!smem_dom) {
+ dev_warn(dev, "No iommu group domain");
+ return 0;
+ }
+
+ addr = iommu_iova_to_phys(smem_dom, iova);
+
+ limit = smem_dev->smem_base + smem_dev->smem_size;
+ if (addr < smem_dev->smem_base || addr >= limit) {
+ dev_err(dev,
+ "Unexpected scp_addr %pa (must >= %pa and <%pa)\n",
+ &addr, &smem_dev->smem_base, &limit);
+ return 0;
+ }
+ dev_dbg(dev, "Pa verifcation pass: %pa(>=%pa, <%pa)\n",
+ &addr, &smem_dev->smem_base, &limit);
+ 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_drv *smem_dev = dev_get_drvdata(dev);
+ int n_pages_align = 0;
+ int size_align = 0;
+ int page_start = 0;
+ unsigned long long offset_p = 0;
+
+ dma_addr_t scp_addr = mtk_cam_smem_iova_to_scp_addr(dev, dma_addr);
+
+ offset_p = (unsigned long long)scp_addr -
+ (unsigned long long)smem_dev->smem_base;
+
+ size_align = round_up(size, PAGE_SIZE);
+ n_pages_align = size_align >> PAGE_SHIFT;
+ page_start = offset_p >> PAGE_SHIFT;
+ dev_dbg(dev,
+ "%s:page idx:%d,page pa:0x%llx,pa:0x%llx, aligned size:%d pages:%d\n",
+ __func__,
+ page_start,
+ (unsigned long long)page_to_phys(*(smem_dev->smem_pages
+ + page_start)),
+ (unsigned long long)scp_addr,
+ size_align,
+ n_pages_align
+ );
+
+ return sg_alloc_table_from_pages(sgt,
+ smem_dev->smem_pages + page_start,
+ n_pages_align,
+ 0, size_align, GFP_KERNEL);
+}
+
+static void *mtk_cam_smem_get_cpu_addr(struct mtk_cam_smem_drv *smem_dev,
+ struct scatterlist *sg)
+{
+ struct device *dev = &smem_dev->pdev->dev;
+ struct dma_coherent_mem *dma_mem = dev->dma_mem;
+
+ dma_addr_t addr = (phys_addr_t)sg_phys(sg);
+
+ if (addr < smem_dev->smem_base ||
+ addr > smem_dev->smem_base + smem_dev->smem_size) {
+ dev_err(dev, "Invalid scp_addr 0x%llx 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_drv *smem_dev =
+ dev_get_drvdata(dev);
+ void *cpu_addr;
+
+ cpu_addr = mtk_cam_smem_get_cpu_addr(smem_dev, sgl);
+ dev_dbg(dev,
+ "__dma_unmap_area:scp_addr(0x%llx),vaddr(0x%llx),size(%d),dir(%d)\n",
+ (unsigned long long)sg_phys(sgl),
+ (unsigned long long)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_drv *smem_dev =
+ dev_get_drvdata(dev);
+ void *cpu_addr;
+
+ cpu_addr = mtk_cam_smem_get_cpu_addr(smem_dev, sgl);
+ flush_cache_vmap((unsigned long long)cpu_addr,
+ (unsigned long long)cpu_addr + sgl->length);
+ __dma_flush_area(cpu_addr, sgl->length);
+ dev_dbg(dev,
+ "__dma_map_area:scp_addr(0x%llx),vaddr(0x%llx),size(%d),dir(%d)\n",
+ (unsigned long long)sg_phys(sgl),
+ (unsigned long long)cpu_addr,
+ sgl->length,
+ dir);
+ __dma_map_area(cpu_addr, sgl->length, dir);
+}
+
+static int mtk_cam_smem_setup_dma_ops(struct device *dev,
+ const struct dma_map_ops *smem_ops)
+{
+ if (!dev->dma_ops)
+ return -EINVAL;
+
+ memcpy((void *)smem_ops, dev->dma_ops, sizeof(*smem_ops));
+ ((struct dma_map_ops *)smem_ops)->get_sgtable =
+ mtk_cam_smem_get_sgtable;
+ ((struct dma_map_ops *)smem_ops)->sync_sg_for_device =
+ mtk_cam_smem_sync_sg_for_device;
+ ((struct dma_map_ops *)smem_ops)->sync_sg_for_cpu =
+ mtk_cam_smem_sync_sg_for_cpu;
+ dev->dma_ops = smem_ops;
+
+ return 0;
+}
+
+static const struct dma_map_ops smem_dma_ops = {
+ .get_sgtable = mtk_cam_smem_get_sgtable,
+};
+
+static int mtk_cam_smem_init(struct mtk_cam_smem_drv **mtk_cam_smem_drv_out,
+ struct platform_device *pdev)
+{
+ struct mtk_cam_smem_drv *isp_sys;
+ struct device *dev = &pdev->dev;
+
+ isp_sys = devm_kzalloc(dev,
+ sizeof(*isp_sys), GFP_KERNEL);
+ isp_sys->pdev = pdev;
+ *mtk_cam_smem_drv_out = isp_sys;
+
+ return 0;
+}
+
+static int mtk_cam_smem_drv_probe(struct platform_device *pdev)
+{
+ struct mtk_cam_smem_drv *smem_drv;
+ int r = 0;
+ struct device *dev = &pdev->dev;
+
+ dev_dbg(dev, "probe mtk_cam_smem_drv\n");
+
+ r = mtk_cam_smem_init(&smem_drv, pdev);
+
+ if (!smem_drv)
+ return -ENOMEM;
+
+ dev_set_drvdata(dev, smem_drv);
+
+ if (isp_reserved_smem) {
+ dma_addr_t dma_addr;
+ dma_addr_t addr;
+ struct iommu_domain *smem_dom;
+ unsigned int i;
+ int size_align;
+ struct page **pages;
+ int n_pages;
+ struct sg_table *sgt = &smem_drv->sgt;
+
+ size_align = round_down(isp_reserved_smem->size,
+ PAGE_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(isp_reserved_smem->base
+ + i * PAGE_SIZE);
+
+ r = sg_alloc_table_from_pages(sgt, pages, n_pages, 0,
+ size_align, GFP_KERNEL);
+
+ if (r) {
+ dev_err(dev, "failed to get alloca sg table\n");
+ return -ENOMEM;
+ }
+
+ dma_map_sg_attrs(dev, sgt->sgl, sgt->nents,
+ DMA_BIDIRECTIONAL,
+ DMA_ATTR_SKIP_CPU_SYNC);
+
+ dma_addr = sg_dma_address(sgt->sgl);
+ smem_dom = iommu_get_domain_for_dev(dev);
+ addr = iommu_iova_to_phys(smem_dom, dma_addr);
+
+ if (addr != isp_reserved_smem->base)
+ dev_err(dev,
+ "incorrect pa(0x%llx) should be 0x%llx\n",
+ (unsigned long long)addr,
+ (unsigned long long)isp_reserved_smem->base);
+
+ r = dma_declare_coherent_memory(dev,
+ isp_reserved_smem->base,
+ dma_addr, size_align, DMA_MEMORY_EXCLUSIVE);
+
+ dev_dbg(dev,
+ "Coherent mem base(0x%llx,%llx),size(%lx),ret(%d)\n",
+ isp_reserved_smem->base,
+ dma_addr, size_align, r);
+
+ smem_drv->smem_base = isp_reserved_smem->base;
+ smem_drv->smem_size = size_align;
+ smem_drv->smem_pages = pages;
+ smem_drv->num_smem_pages = n_pages;
+ smem_drv->smem_dma_base = dma_addr;
+
+ dev_dbg(dev, "smem_drv setting (0x%llx,%lx,0x%llx,%d)\n",
+ smem_drv->smem_base, smem_drv->smem_size,
+ (unsigned long long)smem_drv->smem_pages,
+ smem_drv->num_smem_pages);
+ }
+
+ r = mtk_cam_smem_setup_dma_ops(dev, &smem_dma_ops);
+
+ return r;
+}
+
+static int mtk_cam_smem_drv_remove(struct platform_device *pdev)
+{
+ struct mtk_cam_smem_drv *smem_drv =
+ dev_get_drvdata(&pdev->dev);
+
+ kfree(smem_drv->smem_pages);
+ return 0;
+}
+
+static int mtk_cam_smem_drv_suspend(struct device *dev)
+{
+ return 0;
+}
+
+static int mtk_cam_smem_drv_resume(struct device *dev)
+{
+ return 0;
+}
+
+static int mtk_cam_smem_drv_dummy_cb(struct device *dev)
+{
+ return 0;
+}
+
+static const struct dev_pm_ops mtk_cam_smem_drv_pm_ops = {
+ SET_RUNTIME_PM_OPS(&mtk_cam_smem_drv_dummy_cb,
+ &mtk_cam_smem_drv_dummy_cb, NULL)
+ SET_SYSTEM_SLEEP_PM_OPS
+ (&mtk_cam_smem_drv_suspend, &mtk_cam_smem_drv_resume)
+};
+
+static const struct of_device_id mtk_cam_smem_drv_of_match[] = {
+ {
+ .compatible = "mediatek,mt8183-cam_smem",
+ },
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, mtk_cam_smem_drv_of_match);
+
+static struct platform_driver mtk_cam_smem_driver = {
+ .probe = mtk_cam_smem_drv_probe,
+ .remove = mtk_cam_smem_drv_remove,
+ .driver = {
+ .name = MTK_CAM_SMEM_DEV_NAME,
+ .of_match_table =
+ of_match_ptr(mtk_cam_smem_drv_of_match),
+ .pm = &mtk_cam_smem_drv_pm_ops,
+ },
+};
+
+static int __init mtk_cam_smem_dma_setup(struct reserved_mem
+ *rmem)
+{
+ unsigned long node = rmem->fdt_node;
+
+ if (of_get_flat_dt_prop(node, "reusable", NULL))
+ return -EINVAL;
+
+ if (!of_get_flat_dt_prop(node, "no-map", NULL)) {
+ pr_err("Reserved memory: regions without no-map are not yet supported\n");
+ return -EINVAL;
+ }
+
+ isp_reserved_smem = rmem;
+
+ pr_err("Reserved memory: created DMA memory pool at %pa, size %ld MiB\n",
+ &rmem->base, (unsigned long)rmem->size / SZ_1M);
+ return 0;
+}
+
+RESERVEDMEM_OF_DECLARE(mtk_cam_smem,
+ "mediatek,reserve-memory-cam_smem",
+ mtk_cam_smem_dma_setup);
+
+int __init mtk_cam_smem_drv_init(void)
+{
+ int ret;
+
+ pr_debug("platform_driver_register: mtk_cam_smem_driver\n");
+ ret = platform_driver_register(&mtk_cam_smem_driver);
+ if (ret)
+ pr_warn("isp smem drv init failed, driver didn't probe\n");
+
+ return ret;
+}
+subsys_initcall(mtk_cam_smem_drv_init);
+
+void __exit mtk_cam_smem_drv_ext(void)
+{
+ platform_driver_unregister(&mtk_cam_smem_driver);
+}
+module_exit(mtk_cam_smem_drv_ext);
+MODULE_AUTHOR("Frederic Chen <frederic.chen@mediatek.com>");
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Mediatek CAM shared memory driver");
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 0000000..719ec02
--- /dev/null
+++ b/drivers/media/platform/mtk-isp/isp_50/cam/mtk_cam-smem.h
@@ -0,0 +1,25 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2018 MediaTek Inc.
+ * Author: Frederic Chen <frederic.chen@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#ifndef __MTK_CAM_SMEM_H__
+#define __MTK_CAM_SMEM_H__
+
+#include <linux/dma-mapping.h>
+
+dma_addr_t mtk_cam_smem_iova_to_scp_addr(struct device *smem_dev,
+ dma_addr_t iova);
+
+#endif /*__MTK_CAM_SMEM_H__*/
+
--
1.9.1