[PATCH v7 3/6] media: starfive: camss: Add basic driver

Jack Zhu
2023-06-19T11:29:09Z

Add basic platform driver for StarFive Camera Subsystem.

Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Jack Zhu <jack.zhu@starfivetech.com>
---
MAINTAINERS | 1 +
drivers/media/platform/Kconfig | 1 +
drivers/media/platform/Makefile | 1 +
drivers/media/platform/starfive/Kconfig | 5 +
drivers/media/platform/starfive/Makefile | 2 +
drivers/media/platform/starfive/camss/Kconfig | 16 +
.../media/platform/starfive/camss/Makefile | 8 +
.../media/platform/starfive/camss/stf_camss.c | 338 ++++++++++++++++++
.../media/platform/starfive/camss/stf_camss.h | 146 ++++++++
9 files changed, 518 insertions(+)
create mode 100644 drivers/media/platform/starfive/Kconfig
create mode 100644 drivers/media/platform/starfive/Makefile
create mode 100644 drivers/media/platform/starfive/camss/Kconfig
create mode 100644 drivers/media/platform/starfive/camss/Makefile
create mode 100644 drivers/media/platform/starfive/camss/stf_camss.c
create mode 100644 drivers/media/platform/starfive/camss/stf_camss.h

diff --git a/MAINTAINERS b/MAINTAINERS
index 71291dc58671..62f9e3593eab 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -20077,6 +20077,7 @@ L: linux-media@vger.kernel.org
S: Maintained
F: Documentation/admin-guide/media/starfive_camss.rst
F: Documentation/devicetree/bindings/media/starfive,jh7110-camss.yaml
+F: drivers/media/platform/starfive/camss

STARFIVE DEVICETREES
M: Emil Renner Berthing <kernel@esmil.dk>
diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
index ee579916f874..627eaa0ab3ee 100644
--- a/drivers/media/platform/Kconfig
+++ b/drivers/media/platform/Kconfig
@@ -80,6 +80,7 @@ source "drivers/media/platform/renesas/Kconfig"
source "drivers/media/platform/rockchip/Kconfig"
source "drivers/media/platform/samsung/Kconfig"
source "drivers/media/platform/st/Kconfig"
+source "drivers/media/platform/starfive/Kconfig"
source "drivers/media/platform/sunxi/Kconfig"
source "drivers/media/platform/ti/Kconfig"
source "drivers/media/platform/verisilicon/Kconfig"
diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
index 5453bb868e67..5a038498a370 100644
--- a/drivers/media/platform/Makefile
+++ b/drivers/media/platform/Makefile
@@ -23,6 +23,7 @@ obj-y += renesas/
obj-y += rockchip/
obj-y += samsung/
obj-y += st/
+obj-y += starfive/
obj-y += sunxi/
obj-y += ti/
obj-y += verisilicon/
diff --git a/drivers/media/platform/starfive/Kconfig b/drivers/media/platform/starfive/Kconfig
new file mode 100644
index 000000000000..7955c2a0a4a3
--- /dev/null
+++ b/drivers/media/platform/starfive/Kconfig
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0-only
+
+comment "StarFive media platform drivers"
+
+source "drivers/media/platform/starfive/camss/Kconfig"
diff --git a/drivers/media/platform/starfive/Makefile b/drivers/media/platform/starfive/Makefile
new file mode 100644
index 000000000000..4639fa1bca32
--- /dev/null
+++ b/drivers/media/platform/starfive/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-y += camss/
diff --git a/drivers/media/platform/starfive/camss/Kconfig b/drivers/media/platform/starfive/camss/Kconfig
new file mode 100644
index 000000000000..dafe1d24324b
--- /dev/null
+++ b/drivers/media/platform/starfive/camss/Kconfig
@@ -0,0 +1,16 @@
+# SPDX-License-Identifier: GPL-2.0-only
+config VIDEO_STARFIVE_CAMSS
+ tristate "Starfive Camera Subsystem driver"
+ depends on V4L_PLATFORM_DRIVERS
+ depends on VIDEO_DEV && OF
+ depends on HAS_DMA
+ select MEDIA_CONTROLLER
+ select VIDEO_V4L2_SUBDEV_API
+ select VIDEOBUF2_DMA_CONTIG
+ select V4L2_FWNODE
+ help
+ Enable this to support for the Starfive Camera subsystem
+ found on Starfive JH7110 SoC.
+
+ To compile this driver as a module, choose M here: the
+ module will be called stf-camss.
diff --git a/drivers/media/platform/starfive/camss/Makefile b/drivers/media/platform/starfive/camss/Makefile
new file mode 100644
index 000000000000..d56ddd078a71
--- /dev/null
+++ b/drivers/media/platform/starfive/camss/Makefile
@@ -0,0 +1,8 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for StarFive Camera Subsystem driver
+#
+
+starfive-camss-objs += stf_camss.o
+
+obj-$(CONFIG_VIDEO_STARFIVE_CAMSS) += starfive-camss.o
diff --git a/drivers/media/platform/starfive/camss/stf_camss.c b/drivers/media/platform/starfive/camss/stf_camss.c
new file mode 100644
index 000000000000..dc2b5dba7bd4
--- /dev/null
+++ b/drivers/media/platform/starfive/camss/stf_camss.c
@@ -0,0 +1,338 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * stf_camss.c
+ *
+ * Starfive Camera Subsystem driver
+ *
+ * Copyright (C) 2021-2023 StarFive Technology Co., Ltd.
+ */
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_graph.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/videodev2.h>
+#include <media/v4l2-fwnode.h>
+#include <media/v4l2-mc.h>
+
+#include "stf_camss.h"
+
+static const char * const stfcamss_clocks[] = {
+ "clk_apb_func",
+ "clk_wrapper_clk_c",
+ "clk_dvp_inv",
+ "clk_axiwr",
+ "clk_mipi_rx0_pxl",
+ "clk_ispcore_2x",
+ "clk_isp_axi",
+};
+
+static const char * const stfcamss_resets[] = {
+ "rst_wrapper_p",
+ "rst_wrapper_c",
+ "rst_axird",
+ "rst_axiwr",
+ "rst_isp_top_n",
+ "rst_isp_top_axi",
+};
+
+static int stfcamss_get_mem_res(struct platform_device *pdev,
+ struct stfcamss *stfcamss)
+{
+ stfcamss->syscon_base =
+ devm_platform_ioremap_resource_byname(pdev, "syscon");
+ if (IS_ERR(stfcamss->syscon_base))
+ return PTR_ERR(stfcamss->syscon_base);
+
+ stfcamss->isp_base =
+ devm_platform_ioremap_resource_byname(pdev, "isp");
+ if (IS_ERR(stfcamss->isp_base))
+ return PTR_ERR(stfcamss->isp_base);
+
+ return 0;
+}
+
+/*
+ * stfcamss_of_parse_endpoint_node - Parse port endpoint node
+ * @dev: Device
+ * @node: Device node to be parsed
+ * @csd: Parsed data from port endpoint node
+ *
+ * Return 0 on success or a negative error code on failure
+ */
+static int stfcamss_of_parse_endpoint_node(struct device *dev,
+ struct device_node *node,
+ struct stfcamss_async_subdev *csd)
+{
+ struct v4l2_fwnode_endpoint vep = { { 0 } };
+
+ v4l2_fwnode_endpoint_parse(of_fwnode_handle(node), &vep);
+ dev_dbg(dev, "vep.base.port = %d, id = %d\n",
+ vep.base.port, vep.base.id);
+
+ csd->port = vep.base.port;
+
+ return 0;
+}
+
+/*
+ * stfcamss_of_parse_ports - Parse ports node
+ * @stfcamss: STFCAMSS device
+ *
+ * Return number of "port" nodes found in "ports" node
+ */
+static int stfcamss_of_parse_ports(struct stfcamss *stfcamss)
+{
+ struct device *dev = stfcamss->dev;
+ struct device_node *node = NULL;
+ int ret, num_subdevs = 0;
+
+ for_each_endpoint_of_node(dev->of_node, node) {
+ struct stfcamss_async_subdev *csd;
+
+ if (!of_device_is_available(node))
+ continue;
+
+ csd = v4l2_async_nf_add_fwnode_remote(&stfcamss->notifier,
+ of_fwnode_handle(node),
+ struct stfcamss_async_subdev);
+ if (IS_ERR(csd)) {
+ ret = PTR_ERR(csd);
+ goto err_cleanup;
+ }
+
+ ret = stfcamss_of_parse_endpoint_node(dev, node, csd);
+ if (ret < 0)
+ goto err_cleanup;
+
+ num_subdevs++;
+ }
+
+ return num_subdevs;
+
+err_cleanup:
+ of_node_put(node);
+ return ret;
+}
+
+static int stfcamss_subdev_notifier_bound(struct v4l2_async_notifier *async,
+ struct v4l2_subdev *subdev,
+ struct v4l2_async_subdev *asd)
+{
+ struct media_pad *pad[STF_PADS_NUM];
+ unsigned int i, pad_num = 0;
+
+ for (i = 0; i < pad_num; ++i) {
+ int ret;
+
+ ret = v4l2_create_fwnode_links_to_pad(subdev, pad[i], 0);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int stfcamss_subdev_notifier_complete(struct v4l2_async_notifier *ntf)
+{
+ struct stfcamss *stfcamss =
+ container_of(ntf, struct stfcamss, notifier);
+
+ return v4l2_device_register_subdev_nodes(&stfcamss->v4l2_dev);
+}
+
+static const struct v4l2_async_notifier_operations
+stfcamss_subdev_notifier_ops = {
+ .bound = stfcamss_subdev_notifier_bound,
+ .complete = stfcamss_subdev_notifier_complete,
+};
+
+static const struct media_device_ops stfcamss_media_ops = {
+ .link_notify = v4l2_pipeline_link_notify,
+};
+
+static void stfcamss_mc_init(struct platform_device *pdev,
+ struct stfcamss *stfcamss)
+{
+ stfcamss->media_dev.dev = stfcamss->dev;
+ strscpy(stfcamss->media_dev.model, "Starfive Camera Subsystem",
+ sizeof(stfcamss->media_dev.model));
+ stfcamss->media_dev.ops = &stfcamss_media_ops;
+ media_device_init(&stfcamss->media_dev);
+
+ stfcamss->v4l2_dev.mdev = &stfcamss->media_dev;
+}
+
+/*
+ * stfcamss_probe - Probe STFCAMSS platform device
+ * @pdev: Pointer to STFCAMSS platform device
+ *
+ * Return 0 on success or a negative error code on failure
+ */
+static int stfcamss_probe(struct platform_device *pdev)
+{
+ struct stfcamss *stfcamss;
+ struct device *dev = &pdev->dev;
+ int ret, num_subdevs;
+ unsigned int i;
+
+ stfcamss = devm_kzalloc(dev, sizeof(*stfcamss), GFP_KERNEL);
+ if (!stfcamss)
+ return -ENOMEM;
+
+ for (i = 0; i < ARRAY_SIZE(stfcamss->irq); ++i) {
+ stfcamss->irq[i] = platform_get_irq(pdev, i);
+ if (stfcamss->irq[i] < 0)
+ return dev_err_probe(&pdev->dev, stfcamss->irq[i],
+ "Failed to get irq%d", i);
+ }
+
+ stfcamss->nclks = ARRAY_SIZE(stfcamss->sys_clk);
+ for (i = 0; i < stfcamss->nclks; ++i)
+ stfcamss->sys_clk[i].id = stfcamss_clocks[i];
+ ret = devm_clk_bulk_get(dev, stfcamss->nclks, stfcamss->sys_clk);
+ if (ret) {
+ dev_err(dev, "Failed to get clk controls\n");
+ return ret;
+ }
+
+ stfcamss->nrsts = ARRAY_SIZE(stfcamss->sys_rst);
+ for (i = 0; i < stfcamss->nrsts; ++i)
+ stfcamss->sys_rst[i].id = stfcamss_resets[i];
+ ret = devm_reset_control_bulk_get_shared(dev, stfcamss->nrsts,
+ stfcamss->sys_rst);
+ if (ret) {
+ dev_err(dev, "Failed to get reset controls\n");
+ return ret;
+ }
+
+ ret = stfcamss_get_mem_res(pdev, stfcamss);
+ if (ret) {
+ dev_err(dev, "Could not map registers\n");
+ return ret;
+ }
+
+ stfcamss->dev = dev;
+ platform_set_drvdata(pdev, stfcamss);
+
+ v4l2_async_nf_init(&stfcamss->notifier);
+
+ num_subdevs = stfcamss_of_parse_ports(stfcamss);
+ if (num_subdevs < 0) {
+ ret = -ENODEV;
+ goto err_cleanup_notifier;
+ }
+
+ stfcamss_mc_init(pdev, stfcamss);
+
+ ret = v4l2_device_register(stfcamss->dev, &stfcamss->v4l2_dev);
+ if (ret < 0) {
+ dev_err(dev, "Failed to register V4L2 device: %d\n", ret);
+ goto err_cleanup_notifier;
+ }
+
+ ret = media_device_register(&stfcamss->media_dev);
+ if (ret) {
+ dev_err(dev, "Failed to register media device: %d\n", ret);
+ goto err_unregister_device;
+ }
+
+ pm_runtime_enable(dev);
+
+ stfcamss->notifier.ops = &stfcamss_subdev_notifier_ops;
+ ret = v4l2_async_nf_register(&stfcamss->v4l2_dev, &stfcamss->notifier);
+ if (ret) {
+ dev_err(dev, "Failed to register async subdev nodes: %d\n",
+ ret);
+ goto err_unregister_media_dev;
+ }
+
+ return 0;
+
+err_unregister_media_dev:
+ media_device_unregister(&stfcamss->media_dev);
+err_unregister_device:
+ v4l2_device_unregister(&stfcamss->v4l2_dev);
+err_cleanup_notifier:
+ v4l2_async_nf_cleanup(&stfcamss->notifier);
+ return ret;
+}
+
+/*
+ * stfcamss_remove - Remove STFCAMSS platform device
+ * @pdev: Pointer to STFCAMSS platform device
+ *
+ * Always returns 0.
+ */
+static int stfcamss_remove(struct platform_device *pdev)
+{
+ struct stfcamss *stfcamss = platform_get_drvdata(pdev);
+
+ v4l2_device_unregister(&stfcamss->v4l2_dev);
+ media_device_cleanup(&stfcamss->media_dev);
+ pm_runtime_disable(&pdev->dev);
+
+ return 0;
+}
+
+static const struct of_device_id stfcamss_of_match[] = {
+ { .compatible = "starfive,jh7110-camss" },
+ { /* sentinel */ },
+};
+
+MODULE_DEVICE_TABLE(of, stfcamss_of_match);
+
+static int __maybe_unused stfcamss_runtime_suspend(struct device *dev)
+{
+ struct stfcamss *stfcamss = dev_get_drvdata(dev);
+
+ reset_control_assert(stfcamss->sys_rst[STF_RST_AXIWR].rstc);
+ reset_control_assert(stfcamss->sys_rst[STF_RST_ISP_TOP_AXI].rstc);
+ reset_control_assert(stfcamss->sys_rst[STF_RST_ISP_TOP_N].rstc);
+ clk_disable_unprepare(stfcamss->sys_clk[STF_CLK_ISP_AXI].clk);
+ clk_disable_unprepare(stfcamss->sys_clk[STF_CLK_ISPCORE_2X].clk);
+
+ return 0;
+}
+
+static int __maybe_unused stfcamss_runtime_resume(struct device *dev)
+{
+ struct stfcamss *stfcamss = dev_get_drvdata(dev);
+ int ret;
+
+ ret = clk_prepare_enable(stfcamss->sys_clk[STF_CLK_ISPCORE_2X].clk);
+ if (ret)
+ return ret;
+
+ ret = clk_prepare_enable(stfcamss->sys_clk[STF_CLK_ISP_AXI].clk);
+ if (ret)
+ return ret;
+
+ reset_control_deassert(stfcamss->sys_rst[STF_RST_ISP_TOP_N].rstc);
+ reset_control_deassert(stfcamss->sys_rst[STF_RST_ISP_TOP_AXI].rstc);
+ reset_control_deassert(stfcamss->sys_rst[STF_RST_AXIWR].rstc);
+
+ return 0;
+}
+
+static const struct dev_pm_ops stfcamss_pm_ops = {
+ SET_RUNTIME_PM_OPS(stfcamss_runtime_suspend,
+ stfcamss_runtime_resume,
+ NULL)
+};
+
+static struct platform_driver stfcamss_driver = {
+ .probe = stfcamss_probe,
+ .remove = stfcamss_remove,
+ .driver = {
+ .name = "starfive-camss",
+ .pm = &stfcamss_pm_ops,
+ .of_match_table = of_match_ptr(stfcamss_of_match),
+ },
+};
+
+module_platform_driver(stfcamss_driver);
+
+MODULE_AUTHOR("StarFive Corporation");
+MODULE_DESCRIPTION("StarFive Camera Subsystem driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/media/platform/starfive/camss/stf_camss.h b/drivers/media/platform/starfive/camss/stf_camss.h
new file mode 100644
index 000000000000..15c4f34b9054
--- /dev/null
+++ b/drivers/media/platform/starfive/camss/stf_camss.h
@@ -0,0 +1,146 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * stf_camss.h
+ *
+ * Starfive Camera Subsystem driver
+ *
+ * Copyright (C) 2021-2023 StarFive Technology Co., Ltd.
+ */
+
+#ifndef STF_CAMSS_H
+#define STF_CAMSS_H
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/reset.h>
+#include <media/media-device.h>
+#include <media/media-entity.h>
+#include <media/v4l2-async.h>
+#include <media/v4l2-device.h>
+
+#define STF_DVP_NAME "stf_dvp"
+#define STF_CSI_NAME "cdns_csi2rx"
+#define STF_ISP_NAME "stf_isp"
+#define STF_VIN_NAME "stf_vin"
+
+#define STF_PAD_SINK 0
+#define STF_PAD_SRC 1
+#define STF_PADS_NUM 2
+
+enum stf_port_num {
+ STF_PORT_DVP = 0,
+ STF_PORT_CSI2RX
+};
+
+enum stf_clk {
+ STF_CLK_APB_FUNC = 0,
+ STF_CLK_WRAPPER_CLK_C,
+ STF_CLK_DVP_INV,
+ STF_CLK_AXIWR,
+ STF_CLK_MIPI_RX0_PXL,
+ STF_CLK_ISPCORE_2X,
+ STF_CLK_ISP_AXI,
+ STF_CLK_NUM
+};
+
+enum stf_rst {
+ STF_RST_WRAPPER_P = 0,
+ STF_RST_WRAPPER_C,
+ STF_RST_AXIRD,
+ STF_RST_AXIWR,
+ STF_RST_ISP_TOP_N,
+ STF_RST_ISP_TOP_AXI,
+ STF_RST_NUM
+};
+
+enum stf_irq {
+ STF_IRQ_VINWR = 0,
+ STF_IRQ_ISP,
+ STF_IRQ_ISPCSIL,
+ STF_IRQ_NUM
+};
+
+struct stfcamss {
+ struct v4l2_device v4l2_dev;
+ struct media_device media_dev;
+ struct media_pipeline pipe;
+ struct device *dev;
+ struct v4l2_async_notifier notifier;
+ void __iomem *syscon_base;
+ void __iomem *isp_base;
+ int irq[STF_IRQ_NUM];
+ struct clk_bulk_data sys_clk[STF_CLK_NUM];
+ int nclks;
+ struct reset_control_bulk_data sys_rst[STF_RST_NUM];
+ int nrsts;
+};
+
+struct stfcamss_async_subdev {
+ struct v4l2_async_subdev asd; /* must be first */
+ enum stf_port_num port;
+};
+
+static inline u32 stf_isp_reg_read(struct stfcamss *stfcamss, u32 reg)
+{
+ return ioread32(stfcamss->isp_base + reg);
+}
+
+static inline void stf_isp_reg_write(struct stfcamss *stfcamss,
+ u32 reg, u32 val)
+{
+ iowrite32(val, stfcamss->isp_base + reg);
+}
+
+static inline void stf_isp_reg_write_delay(struct stfcamss *stfcamss,
+ u32 reg, u32 val, u32 delay)
+{
+ iowrite32(val, stfcamss->isp_base + reg);
+ usleep_range(1000 * delay, 1000 * delay + 100);
+}
+
+static inline void stf_isp_reg_set_bit(struct stfcamss *stfcamss,
+ u32 reg, u32 mask, u32 val)
+{
+ u32 value;
+
+ value = ioread32(stfcamss->isp_base + reg) & ~mask;
+ val &= mask;
+ val |= value;
+ iowrite32(val, stfcamss->isp_base + reg);
+}
+
+static inline void stf_isp_reg_set(struct stfcamss *stfcamss, u32 reg, u32 mask)
+{
+ iowrite32(ioread32(stfcamss->isp_base + reg) | mask,
+ stfcamss->isp_base + reg);
+}
+
+static inline u32 stf_syscon_reg_read(struct stfcamss *stfcamss, u32 reg)
+{
+ return ioread32(stfcamss->syscon_base + reg);
+}
+
+static inline void stf_syscon_reg_write(struct stfcamss *stfcamss,
+ u32 reg, u32 val)
+{
+ iowrite32(val, stfcamss->syscon_base + reg);
+}
+
+static inline void stf_syscon_reg_set_bit(struct stfcamss *stfcamss,
+ u32 reg, u32 bit_mask)
+{
+ u32 value;
+
+ value = ioread32(stfcamss->syscon_base + reg);
+ iowrite32(value | bit_mask, stfcamss->syscon_base + reg);
+}
+
+static inline void stf_syscon_reg_clear_bit(struct stfcamss *stfcamss,
+ u32 reg, u32 bit_mask)
+{
+ u32 value;
+
+ value = ioread32(stfcamss->syscon_base + reg);
+ iowrite32(value & ~bit_mask, stfcamss->syscon_base + reg);
+}
+#endif /* STF_CAMSS_H */
--
2.34.1