[PATCH v8 0/3] riscv: sophgo: add dmamux support for Sophgo CV1800/SG2000 SoCs

[PATCH v8 0/3] riscv: sophgo: add dmamux support for Sophgo CV1800/SG2000 SoCs

[Inochi Amaoto]

Add dma multiplexer support for the Sophgo CV1800/SG2000 SoCs.

As the syscon device of CV1800 have a usb phy subdevices. The
binding of the syscon can not be complete without the usb phy
is finished. As a result, the binding of syscon is removed
and will be evolved in its original series after the usb phy
binding is fully explored.

Changed from v7:
1. remove unused variable

Changed from v6:
1. fix copyright time.
2. driver only output mapping info in when debugging.
3. remove dma-master check in the driver init since the binding
always require it.

Changed from v5:
1. remove dead binding header.
2. make "reg" required so the syscon binding can have the same
example node of the dmamux binding.

Changed from v4:
1. remove the syscon binding since it can not be complete (still
lack some subdevices)
2. add reg description for the binding,
3. remove the fixed channel assign for dmamux binding
3. driver adopt to the binding change. Now the driver allocates all the
channel when initing and maps the request chan to the channel dynamicly.

Changed from v3:
1. fix dt-binding address issue.

Changed from v2:
1. add reg property of dmamux node in the binding of patch 2

Changed from v1:
1. fix wrong title of patch 2.


Inochi Amaoto (3):
  dt-bindings: dmaengine: Add dma multiplexer for CV18XX/SG200X series
    SoC
  soc/sophgo: add top sysctrl layout file for CV18XX/SG200X
  dmaengine: add driver for Sophgo CV18XX/SG200X dmamux

 .../bindings/dma/sophgo,cv1800-dmamux.yaml    |  51 ++++
 drivers/dma/Kconfig                           |   9 +
 drivers/dma/Makefile                          |   1 +
 drivers/dma/cv1800-dmamux.c                   | 259 ++++++++++++++++++
 include/soc/sophgo/cv1800-sysctl.h            |  30 ++
 5 files changed, 350 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma/sophgo,cv1800-dmamux.yaml
 create mode 100644 drivers/dma/cv1800-dmamux.c
 create mode 100644 include/soc/sophgo/cv1800-sysctl.h

--
2.44.0

[PATCH v8 1/3] dt-bindings: dmaengine: Add dma multiplexer for CV18XX/SG200X series SoC

[Inochi Amaoto]

The DMA IP of Sophgo CV18XX/SG200X is based on a DW AXI CORE, with
an additional channel remap register located in the top system control
area. The DMA channel is exclusive to each core.

In addition, the DMA multiplexer is a subdevice of system controller,
so this binding only contains necessary properties for the multiplexer
itself.

Add the dmamux binding for CV18XX/SG200X series SoC.

Signed-off-by: Inochi Amaoto <inochiama@outlook.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
---
 .../bindings/dma/sophgo,cv1800-dmamux.yaml    | 51 +++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/dma/sophgo,cv1800-dmamux.yaml

diff --git a/Documentation/devicetree/bindings/dma/sophgo,cv1800-dmamux.yaml b/Documentation/devicetree/bindings/dma/sophgo,cv1800-dmamux.yaml
new file mode 100644
index 000000000000..480cb117db9b
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/sophgo,cv1800-dmamux.yaml
@@ -0,0 +1,51 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/dma/sophgo,cv1800-dmamux.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Sophgo CV1800/SG200 Series DMA multiplexer
+
+maintainers:
+  - Inochi Amaoto <inochiama@outlook.com>
+
+description: |
+  The DMA multiplexer of CV1800 is a subdevice of the system
+  controller. It support mapping 8 channels, but each channel
+  can be mapped only once.
+
+allOf:
+  - $ref: dma-router.yaml#
+
+properties:
+  compatible:
+    const: sophgo,cv1800-dmamux
+
+  reg:
+    items:
+      - description: DMA channal remapping register
+      - description: DMA channel interrupt mapping register
+
+  '#dma-cells':
+    const: 2
+    description:
+      The first cells is device id. The second one is the cpu id.
+
+  dma-masters:
+    maxItems: 1
+
+required:
+  - reg
+  - '#dma-cells'
+  - dma-masters
+
+additionalProperties: false
+
+examples:
+  - |
+    dma-router@154 {
+      compatible = "sophgo,cv1800-dmamux";
+      reg = <0x154 0x8>, <0x298 0x4>;
+      #dma-cells = <2>;
+      dma-masters = <&dmac>;
+    };
--
2.44.0

[PATCH v8 2/3] soc/sophgo: add top sysctrl layout file for CV18XX/SG200X

[Inochi Amaoto]

The "top" system controller of CV18XX/SG200X exposes control
register access for various devices. Add soc header file to
describe it.

Signed-off-by: Inochi Amaoto <inochiama@outlook.com>
---
 include/soc/sophgo/cv1800-sysctl.h | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 include/soc/sophgo/cv1800-sysctl.h

diff --git a/include/soc/sophgo/cv1800-sysctl.h b/include/soc/sophgo/cv1800-sysctl.h
new file mode 100644
index 000000000000..b9396d33e240
--- /dev/null
+++ b/include/soc/sophgo/cv1800-sysctl.h
@@ -0,0 +1,30 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * Copyright (C) 2023 Inochi Amaoto <inochiama@outlook.com>
+ */
+
+#ifndef CV1800_SYSCTL_H
+#define CV1800_SYSCTL_H
+
+/*
+ * SOPHGO CV1800/SG2000 SoC top system controller registers offsets.
+ */
+
+#define CV1800_CONF_INFO		0x004
+#define CV1800_SYS_CTRL_REG		0x008
+#define CV1800_USB_PHY_CTRL_REG		0x048
+#define CV1800_SDMA_DMA_CHANNEL_REMAP0	0x154
+#define CV1800_SDMA_DMA_CHANNEL_REMAP1	0x158
+#define CV1800_TOP_TIMER_CLK_SEL	0x1a0
+#define CV1800_TOP_WDT_CTRL		0x1a8
+#define CV1800_DDR_AXI_URGENT_OW	0x1b8
+#define CV1800_DDR_AXI_URGENT		0x1bc
+#define CV1800_DDR_AXI_QOS_0		0x1d8
+#define CV1800_DDR_AXI_QOS_1		0x1dc
+#define CV1800_SD_PWRSW_CTRL		0x1f4
+#define CV1800_SD_PWRSW_TIME		0x1f8
+#define CV1800_DDR_AXI_QOS_OW		0x23c
+#define CV1800_SD_CTRL_OPT		0x294
+#define CV1800_SDMA_DMA_INT_MUX		0x298
+
+#endif // CV1800_SYSCTL_H
--
2.44.0

[PATCH v8 3/3] dmaengine: add driver for Sophgo CV18XX/SG200X dmamux

[Inochi Amaoto]

Sophgo CV18XX/SG200X use DW AXI CORE with a multiplexer for remapping
its request lines. The multiplexer supports at most 8 request lines.

Add driver for Sophgo CV18XX/SG200X DMA multiplexer.

Signed-off-by: Inochi Amaoto <inochiama@outlook.com>
---
 drivers/dma/Kconfig         |   9 ++
 drivers/dma/Makefile        |   1 +
 drivers/dma/cv1800-dmamux.c | 259 ++++++++++++++++++++++++++++++++++++
 3 files changed, 269 insertions(+)
 create mode 100644 drivers/dma/cv1800-dmamux.c

diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 002a5ec80620..cb31520b9f86 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -546,6 +546,15 @@ config PLX_DMA
 	  These are exposed via extra functions on the switch's
 	  upstream port. Each function exposes one DMA channel.

+config SOPHGO_CV1800_DMAMUX
+	tristate "Sophgo CV1800/SG2000 series SoC DMA multiplexer support"
+	depends on MFD_SYSCON
+	depends on ARCH_SOPHGO
+	help
+	  Support for the DMA multiplexer on Sophgo CV1800/SG2000
+	  series SoCs.
+	  Say Y here if your board have this soc.
+
 config STE_DMA40
 	bool "ST-Ericsson DMA40 support"
 	depends on ARCH_U8500
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index dfd40d14e408..7465f249ee47 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -67,6 +67,7 @@ obj-$(CONFIG_PPC_BESTCOMM) += bestcomm/
 obj-$(CONFIG_PXA_DMA) += pxa_dma.o
 obj-$(CONFIG_RENESAS_DMA) += sh/
 obj-$(CONFIG_SF_PDMA) += sf-pdma/
+obj-$(CONFIG_SOPHGO_CV1800_DMAMUX) += cv1800-dmamux.o
 obj-$(CONFIG_STE_DMA40) += ste_dma40.o ste_dma40_ll.o
 obj-$(CONFIG_STM32_DMA) += stm32-dma.o
 obj-$(CONFIG_STM32_DMAMUX) += stm32-dmamux.o
diff --git a/drivers/dma/cv1800-dmamux.c b/drivers/dma/cv1800-dmamux.c
new file mode 100644
index 000000000000..6ce3c292fe12
--- /dev/null
+++ b/drivers/dma/cv1800-dmamux.c
@@ -0,0 +1,259 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2024 Inochi Amaoto <inochiama@outlook.com>
+ */
+
+#include <linux/bitops.h>
+#include <linux/module.h>
+#include <linux/of_dma.h>
+#include <linux/of_address.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/llist.h>
+#include <linux/regmap.h>
+#include <linux/spinlock.h>
+#include <linux/mfd/syscon.h>
+
+#include <soc/sophgo/cv1800-sysctl.h>
+
+#define DMAMUX_NCELLS			2
+#define MAX_DMA_MAPPING_ID		42
+#define MAX_DMA_CPU_ID			2
+#define MAX_DMA_CH_ID			7
+
+#define DMAMUX_INTMUX_REGISTER_LEN	4
+#define DMAMUX_NR_CH_PER_REGISTER	4
+#define DMAMUX_BIT_PER_CH		8
+#define DMAMUX_CH_MASk			GENMASK(5, 0)
+#define DMAMUX_INT_BIT_PER_CPU		10
+#define DMAMUX_CH_UPDATE_BIT		BIT(31)
+
+#define DMAMUX_CH_REGPOS(chid) \
+	((chid) / DMAMUX_NR_CH_PER_REGISTER)
+#define DMAMUX_CH_REGOFF(chid) \
+	((chid) % DMAMUX_NR_CH_PER_REGISTER)
+#define DMAMUX_CH_REG(chid) \
+	((DMAMUX_CH_REGPOS(chid) * sizeof(u32)) + \
+	 CV1800_SDMA_DMA_CHANNEL_REMAP0)
+#define DMAMUX_CH_SET(chid, val) \
+	(((val) << (DMAMUX_CH_REGOFF(chid) * DMAMUX_BIT_PER_CH)) | \
+	 DMAMUX_CH_UPDATE_BIT)
+#define DMAMUX_CH_MASK(chid) \
+	DMAMUX_CH_SET(chid, DMAMUX_CH_MASk)
+
+#define DMAMUX_INT_BIT(chid, cpuid) \
+	BIT((cpuid) * DMAMUX_INT_BIT_PER_CPU + (chid))
+#define DMAMUX_INTEN_BIT(cpuid) \
+	DMAMUX_INT_BIT(8, cpuid)
+#define DMAMUX_INT_CH_BIT(chid, cpuid) \
+	(DMAMUX_INT_BIT(chid, cpuid) | DMAMUX_INTEN_BIT(cpuid))
+#define DMAMUX_INT_MASK(chid) \
+	(DMAMUX_INT_BIT(chid, 0) | \
+	 DMAMUX_INT_BIT(chid, 1) | \
+	 DMAMUX_INT_BIT(chid, 2))
+#define DMAMUX_INT_CH_MASK(chid, cpuid) \
+	(DMAMUX_INT_MASK(chid) | DMAMUX_INTEN_BIT(cpuid))
+
+struct cv1800_dmamux_data {
+	struct dma_router	dmarouter;
+	struct regmap		*regmap;
+	spinlock_t		lock;
+	struct llist_head	free_maps;
+	struct llist_head	reserve_maps;
+	DECLARE_BITMAP(mapped_peripherals, MAX_DMA_MAPPING_ID);
+};
+
+struct cv1800_dmamux_map {
+	struct llist_node node;
+	unsigned int channel;
+	unsigned int peripheral;
+	unsigned int cpu;
+};
+
+static void cv1800_dmamux_free(struct device *dev, void *route_data)
+{
+	struct cv1800_dmamux_data *dmamux = dev_get_drvdata(dev);
+	struct cv1800_dmamux_map *map = route_data;
+	unsigned long flags;
+
+	spin_lock_irqsave(&dmamux->lock, flags);
+
+	regmap_update_bits(dmamux->regmap,
+			   DMAMUX_CH_REG(map->channel),
+			   DMAMUX_CH_MASK(map->channel),
+			   DMAMUX_CH_UPDATE_BIT);
+
+	regmap_update_bits(dmamux->regmap, CV1800_SDMA_DMA_INT_MUX,
+			   DMAMUX_INT_CH_MASK(map->channel, map->cpu),
+			   DMAMUX_INTEN_BIT(map->cpu));
+
+	spin_unlock_irqrestore(&dmamux->lock, flags);
+
+	dev_dbg(dev, "free channel %u for req %u (cpu %u)\n",
+		map->channel, map->peripheral, map->cpu);
+}
+
+static void *cv1800_dmamux_route_allocate(struct of_phandle_args *dma_spec,
+					  struct of_dma *ofdma)
+{
+	struct platform_device *pdev = of_find_device_by_node(ofdma->of_node);
+	struct cv1800_dmamux_data *dmamux = platform_get_drvdata(pdev);
+	struct cv1800_dmamux_map *map;
+	struct llist_node *node;
+	unsigned long flags;
+	unsigned int chid, devid, cpuid;
+	int ret;
+
+	if (dma_spec->args_count != DMAMUX_NCELLS) {
+		dev_err(&pdev->dev, "invalid number of dma mux args\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	devid = dma_spec->args[0];
+	cpuid = dma_spec->args[1];
+	dma_spec->args_count = 1;
+
+	if (devid > MAX_DMA_MAPPING_ID) {
+		dev_err(&pdev->dev, "invalid device id: %u\n", devid);
+		return ERR_PTR(-EINVAL);
+	}
+
+	if (cpuid > MAX_DMA_CPU_ID) {
+		dev_err(&pdev->dev, "invalid cpu id: %u\n", cpuid);
+		return ERR_PTR(-EINVAL);
+	}
+
+	dma_spec->np = of_parse_phandle(ofdma->of_node, "dma-masters", 0);
+	if (!dma_spec->np) {
+		dev_err(&pdev->dev, "can't get dma master\n");
+		return ERR_PTR(-EINVAL);
+	}
+
+	spin_lock_irqsave(&dmamux->lock, flags);
+
+	if (test_bit(devid, dmamux->mapped_peripherals)) {
+		llist_for_each_entry(map, dmamux->reserve_maps.first, node) {
+			if (map->peripheral == devid && map->cpu == cpuid)
+				goto found;
+		}
+
+		ret = -EINVAL;
+		goto failed;
+	} else {
+		node = llist_del_first(&dmamux->free_maps);
+		if (!node) {
+			ret = -ENODEV;
+			goto failed;
+		}
+
+		map = llist_entry(node, struct cv1800_dmamux_map, node);
+		llist_add(&map->node, &dmamux->reserve_maps);
+		set_bit(devid, dmamux->mapped_peripherals);
+	}
+
+found:
+	chid = map->channel;
+	map->peripheral = devid;
+	map->cpu = cpuid;
+
+	regmap_set_bits(dmamux->regmap,
+			DMAMUX_CH_REG(chid),
+			DMAMUX_CH_SET(chid, devid));
+
+	regmap_update_bits(dmamux->regmap, CV1800_SDMA_DMA_INT_MUX,
+			   DMAMUX_INT_CH_MASK(chid, cpuid),
+			   DMAMUX_INT_CH_BIT(chid, cpuid));
+
+	spin_unlock_irqrestore(&dmamux->lock, flags);
+
+	dma_spec->args[0] = chid;
+
+	dev_dbg(&pdev->dev, "register channel %u for req %u (cpu %u)\n",
+		chid, devid, cpuid);
+
+	return map;
+
+failed:
+	spin_unlock_irqrestore(&dmamux->lock, flags);
+	of_node_put(dma_spec->np);
+	dev_err(&pdev->dev, "errno %d\n", ret);
+	return ERR_PTR(ret);
+
+}
+
+static int cv1800_dmamux_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct device_node *mux_node = dev->of_node;
+	struct cv1800_dmamux_data *data;
+	struct cv1800_dmamux_map *tmp;
+	struct device *parent = dev->parent;
+	struct regmap *regmap = NULL;
+	unsigned int i;
+
+	if (!parent)
+		return -ENODEV;
+
+	regmap = device_node_to_regmap(parent->of_node);
+	if (IS_ERR(regmap))
+		return PTR_ERR(regmap);
+
+	data = devm_kmalloc(dev, sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	spin_lock_init(&data->lock);
+	init_llist_head(&data->free_maps);
+
+	for (i = 0; i <= MAX_DMA_CH_ID; i++) {
+		tmp = devm_kmalloc(dev, sizeof(*tmp), GFP_KERNEL);
+		if (!tmp) {
+			/* It is OK for not allocating all channel */
+			dev_warn(dev, "can not allocate channel %u\n", i);
+			continue;
+		}
+
+		init_llist_node(&tmp->node);
+		tmp->channel = i;
+		llist_add(&tmp->node, &data->free_maps);
+	}
+
+	/* if no channel is allocated, the probe must fail */
+	if (llist_empty(&data->free_maps))
+		return -ENOMEM;
+
+	data->regmap = regmap;
+	data->dmarouter.dev = dev;
+	data->dmarouter.route_free = cv1800_dmamux_free;
+
+	platform_set_drvdata(pdev, data);
+
+	return of_dma_router_register(mux_node,
+				      cv1800_dmamux_route_allocate,
+				      &data->dmarouter);
+}
+
+static void cv1800_dmamux_remove(struct platform_device *pdev)
+{
+	of_dma_controller_free(pdev->dev.of_node);
+}
+
+static const struct of_device_id cv1800_dmamux_ids[] = {
+	{ .compatible = "sophgo,cv1800-dmamux", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, cv1800_dmamux_ids);
+
+static struct platform_driver cv1800_dmamux_driver = {
+	.driver = {
+		.name = "cv1800-dmamux",
+		.of_match_table = cv1800_dmamux_ids,
+	},
+	.probe = cv1800_dmamux_probe,
+	.remove_new = cv1800_dmamux_remove,
+};
+module_platform_driver(cv1800_dmamux_driver);
+
+MODULE_AUTHOR("Inochi Amaoto <inochiama@outlook.com>");
+MODULE_DESCRIPTION("Sophgo CV1800/SG2000 Series Soc DMAMUX driver");
+MODULE_LICENSE("GPL");
--
2.44.0