1 files changed, 555 insertions, 0 deletions
diff --git a/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp.c b/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp.c
new file mode 100644
index 000000000000..7b7947509b69
--- /dev/null
+++ b/drivers/staging/media/sunxi/sun6i-isp/sun6i_isp.c
@@ -0,0 +1,555 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright 2021-2022 Bootlin
+ * Author: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
+ */
+
+#include <linux/clk.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include <media/v4l2-device.h>
+#include <media/v4l2-mc.h>
+
+#include "sun6i_isp.h"
+#include "sun6i_isp_capture.h"
+#include "sun6i_isp_params.h"
+#include "sun6i_isp_proc.h"
+#include "sun6i_isp_reg.h"
+
+/* Helpers */
+
+u32 sun6i_isp_load_read(struct sun6i_isp_device *isp_dev, u32 offset)
+{
+	u32 *data = (u32 *)(isp_dev->tables.load.data + offset);
+
+	return *data;
+}
+
+void sun6i_isp_load_write(struct sun6i_isp_device *isp_dev, u32 offset,
+			  u32 value)
+{
+	u32 *data = (u32 *)(isp_dev->tables.load.data + offset);
+
+	*data = value;
+}
+
+/* State */
+
+/*
+ * The ISP works with a load buffer, which gets copied to the actual registers
+ * by the hardware before processing a frame when a specific flag is set.
+ * This is represented by tracking the ISP state in the different parts of
+ * the code with explicit sync points:
+ * - state update: to update the load buffer for the next frame if necessary;
+ * - state complete: to indicate that the state update was applied.
+ */
+
+static void sun6i_isp_state_ready(struct sun6i_isp_device *isp_dev)
+{
+	struct regmap *regmap = isp_dev->regmap;
+	u32 value;
+
+	regmap_read(regmap, SUN6I_ISP_FE_CTRL_REG, &value);
+	value |= SUN6I_ISP_FE_CTRL_PARA_READY;
+	regmap_write(regmap, SUN6I_ISP_FE_CTRL_REG, value);
+}
+
+static void sun6i_isp_state_complete(struct sun6i_isp_device *isp_dev)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&isp_dev->state_lock, flags);
+
+	sun6i_isp_capture_state_complete(isp_dev);
+	sun6i_isp_params_state_complete(isp_dev);
+
+	spin_unlock_irqrestore(&isp_dev->state_lock, flags);
+}
+
+void sun6i_isp_state_update(struct sun6i_isp_device *isp_dev, bool ready_hold)
+{
+	bool update = false;
+	unsigned long flags;
+
+	spin_lock_irqsave(&isp_dev->state_lock, flags);
+
+	sun6i_isp_capture_state_update(isp_dev, &update);
+	sun6i_isp_params_state_update(isp_dev, &update);
+
+	if (update && !ready_hold)
+		sun6i_isp_state_ready(isp_dev);
+
+	spin_unlock_irqrestore(&isp_dev->state_lock, flags);
+}
+
+/* Tables */
+
+static int sun6i_isp_table_setup(struct sun6i_isp_device *isp_dev,
+				 struct sun6i_isp_table *table)
+{
+	table->data = dma_alloc_coherent(isp_dev->dev, table->size,
+					 &table->address, GFP_KERNEL);
+	if (!table->data)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static void sun6i_isp_table_cleanup(struct sun6i_isp_device *isp_dev,
+				    struct sun6i_isp_table *table)
+{
+	dma_free_coherent(isp_dev->dev, table->size, table->data,
+			  table->address);
+}
+
+void sun6i_isp_tables_configure(struct sun6i_isp_device *isp_dev)
+{
+	struct regmap *regmap = isp_dev->regmap;
+
+	regmap_write(regmap, SUN6I_ISP_REG_LOAD_ADDR_REG,
+		     SUN6I_ISP_ADDR_VALUE(isp_dev->tables.load.address));
+
+	regmap_write(regmap, SUN6I_ISP_REG_SAVE_ADDR_REG,
+		     SUN6I_ISP_ADDR_VALUE(isp_dev->tables.save.address));
+
+	regmap_write(regmap, SUN6I_ISP_LUT_TABLE_ADDR_REG,
+		     SUN6I_ISP_ADDR_VALUE(isp_dev->tables.lut.address));
+
+	regmap_write(regmap, SUN6I_ISP_DRC_TABLE_ADDR_REG,
+		     SUN6I_ISP_ADDR_VALUE(isp_dev->tables.drc.address));
+
+	regmap_write(regmap, SUN6I_ISP_STATS_ADDR_REG,
+		     SUN6I_ISP_ADDR_VALUE(isp_dev->tables.stats.address));
+}
+
+static int sun6i_isp_tables_setup(struct sun6i_isp_device *isp_dev,
+				  const struct sun6i_isp_variant *variant)
+{
+	struct sun6i_isp_tables *tables = &isp_dev->tables;
+	int ret;
+
+	tables->load.size = variant->table_load_save_size;
+	ret = sun6i_isp_table_setup(isp_dev, &tables->load);
+	if (ret)
+		return ret;
+
+	tables->save.size = variant->table_load_save_size;
+	ret = sun6i_isp_table_setup(isp_dev, &tables->save);
+	if (ret)
+		return ret;
+
+	tables->lut.size = variant->table_lut_size;
+	ret = sun6i_isp_table_setup(isp_dev, &tables->lut);
+	if (ret)
+		return ret;
+
+	tables->drc.size = variant->table_drc_size;
+	ret = sun6i_isp_table_setup(isp_dev, &tables->drc);
+	if (ret)
+		return ret;
+
+	tables->stats.size = variant->table_stats_size;
+	ret = sun6i_isp_table_setup(isp_dev, &tables->stats);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static void sun6i_isp_tables_cleanup(struct sun6i_isp_device *isp_dev)
+{
+	struct sun6i_isp_tables *tables = &isp_dev->tables;
+
+	sun6i_isp_table_cleanup(isp_dev, &tables->stats);
+	sun6i_isp_table_cleanup(isp_dev, &tables->drc);
+	sun6i_isp_table_cleanup(isp_dev, &tables->lut);
+	sun6i_isp_table_cleanup(isp_dev, &tables->save);
+	sun6i_isp_table_cleanup(isp_dev, &tables->load);
+}
+
+/* Media */
+
+static const struct media_device_ops sun6i_isp_media_ops = {
+	.link_notify = v4l2_pipeline_link_notify,
+};
+
+/* V4L2 */
+
+static int sun6i_isp_v4l2_setup(struct sun6i_isp_device *isp_dev)
+{
+	struct sun6i_isp_v4l2 *v4l2 = &isp_dev->v4l2;
+	struct v4l2_device *v4l2_dev = &v4l2->v4l2_dev;
+	struct media_device *media_dev = &v4l2->media_dev;
+	struct device *dev = isp_dev->dev;
+	int ret;
+
+	/* Media Device */
+
+	strscpy(media_dev->model, SUN6I_ISP_DESCRIPTION,
+		sizeof(media_dev->model));
+	media_dev->ops = &sun6i_isp_media_ops;
+	media_dev->hw_revision = 0;
+	media_dev->dev = dev;
+
+	media_device_init(media_dev);
+
+	ret = media_device_register(media_dev);
+	if (ret) {
+		dev_err(dev, "failed to register media device\n");
+		return ret;
+	}
+
+	/* V4L2 Device */
+
+	v4l2_dev->mdev = media_dev;
+
+	ret = v4l2_device_register(dev, v4l2_dev);
+	if (ret) {
+		dev_err(dev, "failed to register v4l2 device\n");
+		goto error_media;
+	}
+
+	return 0;
+
+error_media:
+	media_device_unregister(media_dev);
+	media_device_cleanup(media_dev);
+
+	return ret;
+}
+
+static void sun6i_isp_v4l2_cleanup(struct sun6i_isp_device *isp_dev)
+{
+	struct sun6i_isp_v4l2 *v4l2 = &isp_dev->v4l2;
+
+	media_device_unregister(&v4l2->media_dev);
+	v4l2_device_unregister(&v4l2->v4l2_dev);
+	media_device_cleanup(&v4l2->media_dev);
+}
+
+/* Platform */
+
+static irqreturn_t sun6i_isp_interrupt(int irq, void *private)
+{
+	struct sun6i_isp_device *isp_dev = private;
+	struct regmap *regmap = isp_dev->regmap;
+	u32 status = 0, enable = 0;
+
+	regmap_read(regmap, SUN6I_ISP_FE_INT_STA_REG, &status);
+	regmap_read(regmap, SUN6I_ISP_FE_INT_EN_REG, &enable);
+
+	if (!status)
+		return IRQ_NONE;
+	else if (!(status & enable))
+		goto complete;
+
+	/*
+	 * The ISP working cycle starts with a params-load, which makes the
+	 * state from the load buffer active. Then it starts processing the
+	 * frame and gives a finish interrupt. Soon after that, the next state
+	 * coming from the load buffer will be applied for the next frame,
+	 * giving a params-load as well.
+	 *
+	 * Because both frame finish and params-load are received almost
+	 * at the same time (one ISR call), handle them in chronology order.
+	 */
+
+	if (status & SUN6I_ISP_FE_INT_STA_FINISH)
+		sun6i_isp_capture_finish(isp_dev);
+
+	if (status & SUN6I_ISP_FE_INT_STA_PARA_LOAD) {
+		sun6i_isp_state_complete(isp_dev);
+		sun6i_isp_state_update(isp_dev, false);
+	}
+
+complete:
+	regmap_write(regmap, SUN6I_ISP_FE_INT_STA_REG, status);
+
+	return IRQ_HANDLED;
+}
+
+static int sun6i_isp_suspend(struct device *dev)
+{
+	struct sun6i_isp_device *isp_dev = dev_get_drvdata(dev);
+
+	reset_control_assert(isp_dev->reset);
+	clk_disable_unprepare(isp_dev->clock_ram);
+	clk_disable_unprepare(isp_dev->clock_mod);
+
+	return 0;
+}
+
+static int sun6i_isp_resume(struct device *dev)
+{
+	struct sun6i_isp_device *isp_dev = dev_get_drvdata(dev);
+	int ret;
+
+	ret = reset_control_deassert(isp_dev->reset);
+	if (ret) {
+		dev_err(dev, "failed to deassert reset\n");
+		return ret;
+	}
+
+	ret = clk_prepare_enable(isp_dev->clock_mod);
+	if (ret) {
+		dev_err(dev, "failed to enable module clock\n");
+		goto error_reset;
+	}
+
+	ret = clk_prepare_enable(isp_dev->clock_ram);
+	if (ret) {
+		dev_err(dev, "failed to enable ram clock\n");
+		goto error_clock_mod;
+	}
+
+	return 0;
+
+error_clock_mod:
+	clk_disable_unprepare(isp_dev->clock_mod);
+
+error_reset:
+	reset_control_assert(isp_dev->reset);
+
+	return ret;
+}
+
+static const struct dev_pm_ops sun6i_isp_pm_ops = {
+	.runtime_suspend	= sun6i_isp_suspend,
+	.runtime_resume		= sun6i_isp_resume,
+};
+
+static const struct regmap_config sun6i_isp_regmap_config = {
+	.reg_bits       = 32,
+	.reg_stride     = 4,
+	.val_bits       = 32,
+	.max_register	= 0x400,
+};
+
+static int sun6i_isp_resources_setup(struct sun6i_isp_device *isp_dev,
+				     struct platform_device *platform_dev)
+{
+	struct device *dev = isp_dev->dev;
+	void __iomem *io_base;
+	int irq;
+	int ret;
+
+	/* Registers */
+
+	io_base = devm_platform_ioremap_resource(platform_dev, 0);
+	if (IS_ERR(io_base))
+		return PTR_ERR(io_base);
+
+	isp_dev->regmap = devm_regmap_init_mmio_clk(dev, "bus", io_base,
+						    &sun6i_isp_regmap_config);
+	if (IS_ERR(isp_dev->regmap)) {
+		dev_err(dev, "failed to init register map\n");
+		return PTR_ERR(isp_dev->regmap);
+	}
+
+	/* Clocks */
+
+	isp_dev->clock_mod = devm_clk_get(dev, "mod");
+	if (IS_ERR(isp_dev->clock_mod)) {
+		dev_err(dev, "failed to acquire module clock\n");
+		return PTR_ERR(isp_dev->clock_mod);
+	}
+
+	isp_dev->clock_ram = devm_clk_get(dev, "ram");
+	if (IS_ERR(isp_dev->clock_ram)) {
+		dev_err(dev, "failed to acquire ram clock\n");
+		return PTR_ERR(isp_dev->clock_ram);
+	}
+
+	ret = clk_set_rate_exclusive(isp_dev->clock_mod, 297000000);
+	if (ret) {
+		dev_err(dev, "failed to set mod clock rate\n");
+		return ret;
+	}
+
+	/* Reset */
+
+	isp_dev->reset = devm_reset_control_get_shared(dev, NULL);
+	if (IS_ERR(isp_dev->reset)) {
+		dev_err(dev, "failed to acquire reset\n");
+		ret = PTR_ERR(isp_dev->reset);
+		goto error_clock_rate_exclusive;
+	}
+
+	/* Interrupt */
+
+	irq = platform_get_irq(platform_dev, 0);
+	if (irq < 0) {
+		dev_err(dev, "failed to get interrupt\n");
+		ret = -ENXIO;
+		goto error_clock_rate_exclusive;
+	}
+
+	ret = devm_request_irq(dev, irq, sun6i_isp_interrupt, IRQF_SHARED,
+			       SUN6I_ISP_NAME, isp_dev);
+	if (ret) {
+		dev_err(dev, "failed to request interrupt\n");
+		goto error_clock_rate_exclusive;
+	}
+
+	/* Runtime PM */
+
+	pm_runtime_enable(dev);
+
+	return 0;
+
+error_clock_rate_exclusive:
+	clk_rate_exclusive_put(isp_dev->clock_mod);
+
+	return ret;
+}
+
+static void sun6i_isp_resources_cleanup(struct sun6i_isp_device *isp_dev)
+{
+	struct device *dev = isp_dev->dev;
+
+	pm_runtime_disable(dev);
+	clk_rate_exclusive_put(isp_dev->clock_mod);
+}
+
+static int sun6i_isp_probe(struct platform_device *platform_dev)
+{
+	struct sun6i_isp_device *isp_dev;
+	struct device *dev = &platform_dev->dev;
+	const struct sun6i_isp_variant *variant;
+	int ret;
+
+	variant = of_device_get_match_data(dev);
+	if (!variant)
+		return -EINVAL;
+
+	isp_dev = devm_kzalloc(dev, sizeof(*isp_dev), GFP_KERNEL);
+	if (!isp_dev)
+		return -ENOMEM;
+
+	isp_dev->dev = dev;
+	platform_set_drvdata(platform_dev, isp_dev);
+
+	spin_lock_init(&isp_dev->state_lock);
+
+	ret = sun6i_isp_resources_setup(isp_dev, platform_dev);
+	if (ret)
+		return ret;
+
+	ret = sun6i_isp_tables_setup(isp_dev, variant);
+	if (ret) {
+		dev_err(dev, "failed to setup tables\n");
+		goto error_resources;
+	}
+
+	ret = sun6i_isp_v4l2_setup(isp_dev);
+	if (ret) {
+		dev_err(dev, "failed to setup v4l2\n");
+		goto error_tables;
+	}
+
+	ret = sun6i_isp_proc_setup(isp_dev);
+	if (ret) {
+		dev_err(dev, "failed to setup proc\n");
+		goto error_v4l2;
+	}
+
+	ret = sun6i_isp_capture_setup(isp_dev);
+	if (ret) {
+		dev_err(dev, "failed to setup capture\n");
+		goto error_proc;
+	}
+
+	ret = sun6i_isp_params_setup(isp_dev);
+	if (ret) {
+		dev_err(dev, "failed to setup params\n");
+		goto error_capture;
+	}
+
+	return 0;
+
+error_capture:
+	sun6i_isp_capture_cleanup(isp_dev);
+
+error_proc:
+	sun6i_isp_proc_cleanup(isp_dev);
+
+error_v4l2:
+	sun6i_isp_v4l2_cleanup(isp_dev);
+
+error_tables:
+	sun6i_isp_tables_cleanup(isp_dev);
+
+error_resources:
+	sun6i_isp_resources_cleanup(isp_dev);
+
+	return ret;
+}
+
+static int sun6i_isp_remove(struct platform_device *platform_dev)
+{
+	struct sun6i_isp_device *isp_dev = platform_get_drvdata(platform_dev);
+
+	sun6i_isp_params_cleanup(isp_dev);
+	sun6i_isp_capture_cleanup(isp_dev);
+	sun6i_isp_proc_cleanup(isp_dev);
+	sun6i_isp_v4l2_cleanup(isp_dev);
+	sun6i_isp_tables_cleanup(isp_dev);
+	sun6i_isp_resources_cleanup(isp_dev);
+
+	return 0;
+}
+
+/*
+ * History of sun6i-isp:
+ * - sun4i-a10-isp: initial ISP tied to the CSI0 controller,
+ *   apparently unused in software implementations;
+ * - sun6i-a31-isp: separate ISP loosely based on sun4i-a10-isp,
+ *   adding extra modules and features;
+ * - sun9i-a80-isp: based on sun6i-a31-isp with some register offset changes
+ *   and new modules like saturation and cnr;
+ * - sun8i-a23-isp/sun8i-h3-isp: based on sun9i-a80-isp with most modules
+ *   related to raw removed;
+ * - sun8i-a83t-isp: based on sun9i-a80-isp with some register offset changes
+ * - sun8i-v3s-isp: based on sun8i-a83t-isp with a new disc module;
+ */
+
+static const struct sun6i_isp_variant sun8i_v3s_isp_variant = {
+	.table_load_save_size	= 0x1000,
+	.table_lut_size		= 0xe00,
+	.table_drc_size		= 0x600,
+	.table_stats_size	= 0x2100,
+};
+
+static const struct of_device_id sun6i_isp_of_match[] = {
+	{
+		.compatible	= "allwinner,sun8i-v3s-isp",
+		.data		= &sun8i_v3s_isp_variant,
+	},
+	{},
+};
+
+MODULE_DEVICE_TABLE(of, sun6i_isp_of_match);
+
+static struct platform_driver sun6i_isp_platform_driver = {
+	.probe	= sun6i_isp_probe,
+	.remove	= sun6i_isp_remove,
+	.driver	= {
+		.name		= SUN6I_ISP_NAME,
+		.of_match_table	= of_match_ptr(sun6i_isp_of_match),
+		.pm		= &sun6i_isp_pm_ops,
+	},
+};
+
+module_platform_driver(sun6i_isp_platform_driver);
+
+MODULE_DESCRIPTION("Allwinner A31 Image Signal Processor driver");
+MODULE_AUTHOR("Paul Kocialkowski <paul.kocialkowski@bootlin.com>");
+MODULE_LICENSE("GPL");