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@xxxxxxxxxxx>
---
drivers/dma/Kconfig | 9 ++
drivers/dma/Makefile | 1 +
drivers/dma/cv1800-dmamux.c | 232 ++++++++++++++++++++++++++++++++++++
3 files changed, 242 insertions(+)
create mode 100644 drivers/dma/cv1800-dmamux.c
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index e928f2ca0f1e..5220b4eba3a4 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..b41c39f2e338
--- /dev/null
+++ b/drivers/dma/cv1800-dmamux.c
@@ -0,0 +1,232 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2023 Inochi Amaoto <inochiama@xxxxxxxxxxx>
+ */
+
+#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/regmap.h>
+#include <linux/spinlock.h>
+#include <linux/mfd/syscon.h>
+
+#include <soc/sophgo/cv1800-sysctl.h>
+#include <dt-bindings/dma/cv1800-dma.h>
+
+#define DMAMUX_NCELLS 3
+#define MAX_DMA_MAPPING_ID DMA_SPI_NOR1
+#define MAX_DMA_CPU_ID DMA_CPU_C906_1
+#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_SET(chid, val) \
+ (((val) << ((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, DMA_CPU_A53) | \
+ DMAMUX_INT_BIT(chid, DMA_CPU_C906_0) | \
+ DMAMUX_INT_BIT(chid, DMA_CPU_C906_1))
+#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;
+ DECLARE_BITMAP(used_chans, MAX_DMA_CH_ID);
+ DECLARE_BITMAP(mapped_peripherals, MAX_DMA_MAPPING_ID);
+};
+
+struct cv1800_dmamux_map {
+ 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;
+ u32 regoff = map->channel % DMAMUX_NR_CH_PER_REGISTER;
+ u32 regpos = map->channel / DMAMUX_NR_CH_PER_REGISTER;
+ unsigned long flags;
+
+ spin_lock_irqsave(&dmamux->lock, flags);
+
+ regmap_update_bits(dmamux->regmap,
+ regpos + CV1800_SDMA_DMA_CHANNEL_REMAP0,
+ DMAMUX_CH_MASK(regoff),
+ 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));
+
+ clear_bit(map->channel, dmamux->used_chans);
+ clear_bit(map->peripheral, dmamux->mapped_peripherals);
+
+ spin_unlock_irqrestore(&dmamux->lock, flags);
+
+ kfree(map);
+}
+
+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;
+ unsigned long flags;
+ unsigned int chid, devid, cpuid;
+ u32 regoff, regpos;
+
+ if (dma_spec->args_count != DMAMUX_NCELLS) {
+ dev_err(&pdev->dev, "invalid number of dma mux args\n");
+ return ERR_PTR(-EINVAL);
+ }
+
+ chid = dma_spec->args[0];
+ devid = dma_spec->args[1];
+ cpuid = dma_spec->args[2];
+ dma_spec->args_count -= 2;
+
+ if (chid > MAX_DMA_CH_ID) {
+ dev_err(&pdev->dev, "invalid channel id: %u\n", chid);
+ return ERR_PTR(-EINVAL);
+ }
+
+ 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);
+ }
+
+ map = kzalloc(sizeof(*map), GFP_KERNEL);
+ if (!map)
+ return ERR_PTR(-ENOMEM);
+
+ map->channel = chid;
+ map->peripheral = devid;
+ map->cpu = cpuid;
+
+ regoff = chid % DMAMUX_NR_CH_PER_REGISTER;
+ regpos = chid / DMAMUX_NR_CH_PER_REGISTER;
+
+ spin_lock_irqsave(&dmamux->lock, flags);
+
+ if (test_and_set_bit(devid, dmamux->mapped_peripherals)) {
+ dev_err(&pdev->dev, "already used device mapping: %u\n", devid);
+ goto failed;
+ }
+
+ if (test_and_set_bit(chid, dmamux->used_chans)) {
+ clear_bit(devid, dmamux->mapped_peripherals);
+ dev_err(&pdev->dev, "already used channel id: %u\n", chid);
+ goto failed;
+ }
+
+ regmap_set_bits(dmamux->regmap,
+ regpos + CV1800_SDMA_DMA_CHANNEL_REMAP0,
+ DMAMUX_CH_SET(regoff, 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);
+
+ dev_info(&pdev->dev, "register channel %u for req %u (cpu %u)\n",
+ chid, devid, cpuid);
+
+ return map;
+
+failed:
+ spin_unlock_irqrestore(&dmamux->lock, flags);
+ dev_err(&pdev->dev, "already used channel id: %u\n", chid);
+ return ERR_PTR(-EBUSY);
+}
+
+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 device *parent = dev->parent;
+ struct device_node *dma_master;
+ struct regmap *map = NULL;
+
+ if (!parent)
+ return -ENODEV;
+
+ map = device_node_to_regmap(parent->of_node);
+ if (IS_ERR(map))
+ return PTR_ERR(map);
+
+ dma_master = of_parse_phandle(mux_node, "dma-masters", 0);
+ if (!dma_master) {
+ dev_err(dev, "invalid dma-requests property\n");
+ return -ENODEV;
+ }
+ of_node_put(dma_master);
+
+ data = devm_kmalloc(dev, sizeof(*data), GFP_KERNEL);
+ if (!data)
+ return -ENOMEM;
+
+ spin_lock_init(&data->lock);
+ data->regmap = map;
+ 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 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 = "fsl-raideng",
+ .of_match_table = cv1800_dmamux_ids,
+ },
+ .probe = cv1800_dmamux_probe,
+};
+module_platform_driver(cv1800_dmamux_driver);
+
+MODULE_AUTHOR("Inochi Amaoto <inochiama@xxxxxxxxxxx>");
+MODULE_DESCRIPTION("Sophgo CV1800/SG2000 Series Soc DMAMUX driver");
+MODULE_LICENSE("GPL");
--
2.43.2
