* [PATCH v14 1/2] dt-bindings: dmaengine: Add dma multiplexer for CV18XX/SG200X series SoC
2025-06-11 8:09 [PATCH v14 0/2] riscv: sophgo: add dmamux support for Sophgo CV1800/SG2000 SoCs Inochi Amaoto
@ 2025-06-11 8:09 ` Inochi Amaoto
2025-06-11 8:09 ` [PATCH v14 2/2] dmaengine: add driver for Sophgo CV18XX/SG200X dmamux Inochi Amaoto
2025-06-17 17:29 ` [PATCH v14 0/2] riscv: sophgo: add dmamux support for Sophgo CV1800/SG2000 SoCs Vinod Koul
2 siblings, 0 replies; 5+ messages in thread
From: Inochi Amaoto @ 2025-06-11 8:09 UTC (permalink / raw)
To: Vinod Koul, Rob Herring, Krzysztof Kozlowski, Conor Dooley,
Chen Wang, Inochi Amaoto, Paul Walmsley, Palmer Dabbelt,
Albert Ou, Alexandre Ghiti
Cc: dmaengine, devicetree, sophgo, linux-kernel, linux-riscv,
Yixun Lan, Longbin Li, Conor Dooley
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@gmail.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
---
.../bindings/dma/sophgo,cv1800b-dmamux.yaml | 51 +++++++++++++++++++
1 file changed, 51 insertions(+)
create mode 100644 Documentation/devicetree/bindings/dma/sophgo,cv1800b-dmamux.yaml
diff --git a/Documentation/devicetree/bindings/dma/sophgo,cv1800b-dmamux.yaml b/Documentation/devicetree/bindings/dma/sophgo,cv1800b-dmamux.yaml
new file mode 100644
index 000000000000..011002942235
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/sophgo,cv1800b-dmamux.yaml
@@ -0,0 +1,51 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/dma/sophgo,cv1800b-dmamux.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Sophgo CV1800/SG200 Series DMA multiplexer
+
+maintainers:
+ - Inochi Amaoto <inochiama@gmail.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,cv1800b-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,cv1800b-dmamux";
+ reg = <0x154 0x8>, <0x298 0x4>;
+ #dma-cells = <2>;
+ dma-masters = <&dmac>;
+ };
--
2.49.0
^ permalink raw reply related [flat|nested] 5+ messages in thread* [PATCH v14 2/2] dmaengine: add driver for Sophgo CV18XX/SG200X dmamux
2025-06-11 8:09 [PATCH v14 0/2] riscv: sophgo: add dmamux support for Sophgo CV1800/SG2000 SoCs Inochi Amaoto
2025-06-11 8:09 ` [PATCH v14 1/2] dt-bindings: dmaengine: Add dma multiplexer for CV18XX/SG200X series SoC Inochi Amaoto
@ 2025-06-11 8:09 ` Inochi Amaoto
2025-06-15 15:39 ` Alexander Sverdlin
2025-06-17 17:29 ` [PATCH v14 0/2] riscv: sophgo: add dmamux support for Sophgo CV1800/SG2000 SoCs Vinod Koul
2 siblings, 1 reply; 5+ messages in thread
From: Inochi Amaoto @ 2025-06-11 8:09 UTC (permalink / raw)
To: Vinod Koul, Rob Herring, Krzysztof Kozlowski, Conor Dooley,
Chen Wang, Inochi Amaoto, Paul Walmsley, Palmer Dabbelt,
Albert Ou, Alexandre Ghiti
Cc: dmaengine, devicetree, sophgo, linux-kernel, linux-riscv,
Yixun Lan, Longbin Li
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@gmail.com>
---
drivers/dma/Kconfig | 9 ++
drivers/dma/Makefile | 1 +
drivers/dma/cv1800b-dmamux.c | 259 +++++++++++++++++++++++++++++++++++
3 files changed, 269 insertions(+)
create mode 100644 drivers/dma/cv1800b-dmamux.c
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index db87dd2a07f7..5d81e34f8e1f 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -572,6 +572,15 @@ config PLX_DMA
These are exposed via extra functions on the switch's
upstream port. Each function exposes one DMA channel.
+config SOPHGO_CV1800B_DMAMUX
+ tristate "Sophgo CV1800/SG2000 series SoC DMA multiplexer support"
+ depends on MFD_SYSCON
+ depends on ARCH_SOPHGO || COMPILE_TEST
+ 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 ba9732644752..a54d7688392b 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -71,6 +71,7 @@ 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_CV1800B_DMAMUX) += cv1800b-dmamux.o
obj-$(CONFIG_STE_DMA40) += ste_dma40.o ste_dma40_ll.o
obj-$(CONFIG_SPRD_DMA) += sprd-dma.o
obj-$(CONFIG_TXX9_DMAC) += txx9dmac.o
diff --git a/drivers/dma/cv1800b-dmamux.c b/drivers/dma/cv1800b-dmamux.c
new file mode 100644
index 000000000000..e900d6595617
--- /dev/null
+++ b/drivers/dma/cv1800b-dmamux.c
@@ -0,0 +1,259 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2025 Inochi Amaoto <inochiama@gmail.com>
+ */
+
+#include <linux/bitops.h>
+#include <linux/cleanup.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>
+
+#define REG_DMA_CHANNEL_REMAP0 0x154
+#define REG_DMA_CHANNEL_REMAP1 0x158
+#define REG_DMA_INT_MUX 0x298
+
+#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)) + \
+ REG_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;
+
+ guard(spinlock_irqsave)(&dmamux->lock);
+
+ regmap_update_bits(dmamux->regmap,
+ DMAMUX_CH_REG(map->channel),
+ DMAMUX_CH_MASK(map->channel),
+ DMAMUX_CH_UPDATE_BIT);
+
+ regmap_update_bits(dmamux->regmap, REG_DMA_INT_MUX,
+ DMAMUX_INT_CH_MASK(map->channel, map->cpu),
+ DMAMUX_INTEN_BIT(map->cpu));
+
+ 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, REG_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_kzalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ spin_lock_init(&data->lock);
+ init_llist_head(&data->free_maps);
+ init_llist_head(&data->reserve_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,cv1800b-dmamux", },
+ { }
+};
+MODULE_DEVICE_TABLE(of, cv1800_dmamux_ids);
+
+static struct platform_driver cv1800_dmamux_driver = {
+ .probe = cv1800_dmamux_probe,
+ .remove = cv1800_dmamux_remove,
+ .driver = {
+ .name = "cv1800-dmamux",
+ .of_match_table = cv1800_dmamux_ids,
+ },
+};
+module_platform_driver(cv1800_dmamux_driver);
+
+MODULE_AUTHOR("Inochi Amaoto <inochiama@gmail.com>");
+MODULE_DESCRIPTION("Sophgo CV1800/SG2000 Series SoC DMAMUX driver");
+MODULE_LICENSE("GPL");
--
2.49.0
^ permalink raw reply related [flat|nested] 5+ messages in thread