| Message ID | 20220225112403.505562-5-miquel.raynal@bootlin.com (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
| Series | RZN1 DMA support | expand |
Hi Miquel, Thank you for the patch. On Fri, Feb 25, 2022 at 12:09 PM Miquel Raynal <miquel.raynal@bootlin.com> wrote: > > The Renesas RZN1 DMA IP is a based on a DW core, with eg. an additional > dmamux register located in the system control area which can take up to > 32 requests (16 per DMA controller). Each DMA channel can be wired to > two different peripherals. > > We need two additional information from the 'dmas' property: the channel > (bit in the dmamux register) that must be accessed and the value of the > mux for this channel. > > Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> > --- > drivers/dma/dw/Kconfig | 8 ++ > drivers/dma/dw/Makefile | 2 + > drivers/dma/dw/rzn1-dmamux.c | 152 +++++++++++++++++++++++++++++++++++ > 3 files changed, 162 insertions(+) > create mode 100644 drivers/dma/dw/rzn1-dmamux.c > > diff --git a/drivers/dma/dw/Kconfig b/drivers/dma/dw/Kconfig > index db25f9b7778c..dd53d4a9fa92 100644 > --- a/drivers/dma/dw/Kconfig > +++ b/drivers/dma/dw/Kconfig > @@ -16,6 +16,14 @@ config DW_DMAC > Support the Synopsys DesignWare AHB DMA controller. This > can be integrated in chips such as the Intel Cherrytrail. > > +config RZN1_DMAMUX > + tristate "Renesas RZ/N1 DMAMUX driver" > + depends on DW_DMAC Maybe dependencies for ARCH_RZN1and COMPILE_TEST too? > + help > + Support the Renesas RZ/N1 DMAMUX which is located in front of > + the Synopsys DesignWare AHB DMA controller located on Renesas > + SoCs. > + > config DW_DMAC_PCI > tristate "Synopsys DesignWare AHB DMA PCI driver" > depends on PCI > diff --git a/drivers/dma/dw/Makefile b/drivers/dma/dw/Makefile > index a6f358ad8591..8025f75e589c 100644 > --- a/drivers/dma/dw/Makefile > +++ b/drivers/dma/dw/Makefile > @@ -7,5 +7,7 @@ obj-$(CONFIG_DW_DMAC) += dw_dmac.o > dw_dmac-y := platform.o > dw_dmac-$(CONFIG_OF) += of.o > > +obj-$(CONFIG_RZN1_DMAMUX) += rzn1-dmamux.o > + > obj-$(CONFIG_DW_DMAC_PCI) += dw_dmac_pci.o > dw_dmac_pci-y := pci.o > diff --git a/drivers/dma/dw/rzn1-dmamux.c b/drivers/dma/dw/rzn1-dmamux.c > new file mode 100644 > index 000000000000..bc4e2e7c3d18 > --- /dev/null > +++ b/drivers/dma/dw/rzn1-dmamux.c > @@ -0,0 +1,152 @@ > +// SPDX-License-Identifier: GPL-2.0-only > +/* > + * Copyright (C) 2022 Schneider-Electric > + * Author: Miquel Raynal <miquel.raynal@bootlin.com > + * Based on TI crossbar driver written by Peter Ujfalusi <peter.ujfalusi@ti.com> > + */ > +#include <linux/slab.h> > +#include <linux/err.h> > +#include <linux/init.h> > +#include <linux/list.h> > +#include <linux/io.h> > +#include <linux/of_address.h> can you please check if the above four includes are really required. > +#include <linux/of_device.h> > +#include <linux/of_dma.h> > +#include <linux/soc/renesas/r9a06g032-sysctrl.h> > + headers need to be sorted. > +#define RZN1_DMAMUX_LINES 64 > +#define RZN1_DMAMUX_SPLIT 16 > + > +struct rzn1_dmamux_data { > + struct dma_router dmarouter; > + u32 used_chans; > + struct mutex lock; > +}; > + > +struct rzn1_dmamux_map { > + unsigned int req_idx; > +}; > + > +static void rzn1_dmamux_free(struct device *dev, void *route_data) > +{ > + struct rzn1_dmamux_data *dmamux = dev_get_drvdata(dev); > + struct rzn1_dmamux_map *map = route_data; > + > + dev_dbg(dev, "Unmapping DMAMUX request %u\n", map->req_idx); > + > + mutex_lock(&dmamux->lock); > + dmamux->used_chans &= ~BIT(map->req_idx); > + mutex_unlock(&dmamux->lock); > + > + kfree(map); > +} > + > +static void *rzn1_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 rzn1_dmamux_data *dmamux = platform_get_drvdata(pdev); > + struct rzn1_dmamux_map *map; > + unsigned int dmac_idx, chan, val; > + u32 mask; > + int ret; > + > + map = kzalloc(sizeof(*map), GFP_KERNEL); > + if (!map) > + return ERR_PTR(-ENOMEM); > + map needs to be freed in the error path. > + if (dma_spec->args_count != 6) > + return ERR_PTR(-EINVAL); > + > + chan = dma_spec->args[0]; > + map->req_idx = dma_spec->args[4]; > + val = dma_spec->args[5]; > + dma_spec->args_count -= 2; > + > + if (chan >= RZN1_DMAMUX_SPLIT) { > + dev_err(&pdev->dev, "Invalid DMA request line: %u\n", chan); > + return ERR_PTR(-EINVAL); > + } > + > + if (map->req_idx >= RZN1_DMAMUX_LINES || > + (map->req_idx % RZN1_DMAMUX_SPLIT) != chan) { > + dev_err(&pdev->dev, "Invalid MUX request line: %u\n", map->req_idx); > + return ERR_PTR(-EINVAL); > + } > + > + dmac_idx = map->req_idx < RZN1_DMAMUX_SPLIT ? 0 : 1; > + dma_spec->np = of_parse_phandle(ofdma->of_node, "dma-masters", dmac_idx); > + if (!dma_spec->np) { > + dev_err(&pdev->dev, "Can't get DMA master\n"); > + return ERR_PTR(-EINVAL); > + } > + > + dev_dbg(&pdev->dev, "Mapping DMAMUX request %u to DMAC%u request %u\n", > + map->req_idx, dmac_idx, chan); > + > + mask = BIT(map->req_idx); > + mutex_lock(&dmamux->lock); > + dmamux->used_chans |= mask; > + ret = r9a06g032_sysctrl_set_dmamux(mask, val ? mask : 0); > + mutex_unlock(&dmamux->lock); > + if (ret) { > + rzn1_dmamux_free(&pdev->dev, map); > + return ERR_PTR(ret); > + } > + > + return map; > +} > + > +static const struct of_device_id rzn1_dmac_match[] __maybe_unused = { any reason for using __maybe_unused? > + { .compatible = "renesas,rzn1-dma" }, > + {}, "," not required. > +}; > + > +static int rzn1_dmamux_probe(struct platform_device *pdev) > +{ > + struct device_node *mux_node = pdev->dev.of_node; > + const struct of_device_id *match; > + struct device_node *dmac_node; > + struct rzn1_dmamux_data *dmamux; > + > + dmamux = devm_kzalloc(&pdev->dev, sizeof(*dmamux), GFP_KERNEL); > + if (!dmamux) > + return -ENOMEM; > + > + mutex_init(&dmamux->lock); > + > + dmac_node = of_parse_phandle(mux_node, "dma-masters", 0); > + if (!dmac_node) > + return dev_err_probe(&pdev->dev, -ENODEV, "Can't get DMA master node\n"); > + > + match = of_match_node(rzn1_dmac_match, dmac_node); > + of_node_put(dmac_node); > + if (!match) > + return dev_err_probe(&pdev->dev, -EINVAL, "DMA master is not supported\n"); > + > + dmamux->dmarouter.dev = &pdev->dev; > + dmamux->dmarouter.route_free = rzn1_dmamux_free; > + > + platform_set_drvdata(pdev, dmamux); > + > + return of_dma_router_register(mux_node, rzn1_dmamux_route_allocate, > + &dmamux->dmarouter); > +} > + > +static const struct of_device_id rzn1_dmamux_match[] = { > + { .compatible = "renesas,rzn1-dmamux" }, > + {}, "," not required. > +}; > + > +static struct platform_driver rzn1_dmamux_driver = { > + .driver = { > + .name = "renesas,rzn1-dmamux", > + .of_match_table = rzn1_dmamux_match, > + }, > + .probe = rzn1_dmamux_probe, > +}; > +module_platform_driver(rzn1_dmamux_driver); > + > +MODULE_LICENSE("GPL"); > +MODULE_AUTHOR("Miquel Raynal <miquel.raynal@bootlin.com"); > +MODULE_DESCRIPTION("Renesas RZ/N1 DMAMUX driver"); > -- > 2.27.0 > Cheers, Prabhakar
diff --git a/drivers/dma/dw/Kconfig b/drivers/dma/dw/Kconfig index db25f9b7778c..dd53d4a9fa92 100644 --- a/drivers/dma/dw/Kconfig +++ b/drivers/dma/dw/Kconfig @@ -16,6 +16,14 @@ config DW_DMAC Support the Synopsys DesignWare AHB DMA controller. This can be integrated in chips such as the Intel Cherrytrail. +config RZN1_DMAMUX + tristate "Renesas RZ/N1 DMAMUX driver" + depends on DW_DMAC + help + Support the Renesas RZ/N1 DMAMUX which is located in front of + the Synopsys DesignWare AHB DMA controller located on Renesas + SoCs. + config DW_DMAC_PCI tristate "Synopsys DesignWare AHB DMA PCI driver" depends on PCI diff --git a/drivers/dma/dw/Makefile b/drivers/dma/dw/Makefile index a6f358ad8591..8025f75e589c 100644 --- a/drivers/dma/dw/Makefile +++ b/drivers/dma/dw/Makefile @@ -7,5 +7,7 @@ obj-$(CONFIG_DW_DMAC) += dw_dmac.o dw_dmac-y := platform.o dw_dmac-$(CONFIG_OF) += of.o +obj-$(CONFIG_RZN1_DMAMUX) += rzn1-dmamux.o + obj-$(CONFIG_DW_DMAC_PCI) += dw_dmac_pci.o dw_dmac_pci-y := pci.o diff --git a/drivers/dma/dw/rzn1-dmamux.c b/drivers/dma/dw/rzn1-dmamux.c new file mode 100644 index 000000000000..bc4e2e7c3d18 --- /dev/null +++ b/drivers/dma/dw/rzn1-dmamux.c @@ -0,0 +1,152 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2022 Schneider-Electric + * Author: Miquel Raynal <miquel.raynal@bootlin.com + * Based on TI crossbar driver written by Peter Ujfalusi <peter.ujfalusi@ti.com> + */ +#include <linux/slab.h> +#include <linux/err.h> +#include <linux/init.h> +#include <linux/list.h> +#include <linux/io.h> +#include <linux/of_address.h> +#include <linux/of_device.h> +#include <linux/of_dma.h> +#include <linux/soc/renesas/r9a06g032-sysctrl.h> + +#define RZN1_DMAMUX_LINES 64 +#define RZN1_DMAMUX_SPLIT 16 + +struct rzn1_dmamux_data { + struct dma_router dmarouter; + u32 used_chans; + struct mutex lock; +}; + +struct rzn1_dmamux_map { + unsigned int req_idx; +}; + +static void rzn1_dmamux_free(struct device *dev, void *route_data) +{ + struct rzn1_dmamux_data *dmamux = dev_get_drvdata(dev); + struct rzn1_dmamux_map *map = route_data; + + dev_dbg(dev, "Unmapping DMAMUX request %u\n", map->req_idx); + + mutex_lock(&dmamux->lock); + dmamux->used_chans &= ~BIT(map->req_idx); + mutex_unlock(&dmamux->lock); + + kfree(map); +} + +static void *rzn1_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 rzn1_dmamux_data *dmamux = platform_get_drvdata(pdev); + struct rzn1_dmamux_map *map; + unsigned int dmac_idx, chan, val; + u32 mask; + int ret; + + map = kzalloc(sizeof(*map), GFP_KERNEL); + if (!map) + return ERR_PTR(-ENOMEM); + + if (dma_spec->args_count != 6) + return ERR_PTR(-EINVAL); + + chan = dma_spec->args[0]; + map->req_idx = dma_spec->args[4]; + val = dma_spec->args[5]; + dma_spec->args_count -= 2; + + if (chan >= RZN1_DMAMUX_SPLIT) { + dev_err(&pdev->dev, "Invalid DMA request line: %u\n", chan); + return ERR_PTR(-EINVAL); + } + + if (map->req_idx >= RZN1_DMAMUX_LINES || + (map->req_idx % RZN1_DMAMUX_SPLIT) != chan) { + dev_err(&pdev->dev, "Invalid MUX request line: %u\n", map->req_idx); + return ERR_PTR(-EINVAL); + } + + dmac_idx = map->req_idx < RZN1_DMAMUX_SPLIT ? 0 : 1; + dma_spec->np = of_parse_phandle(ofdma->of_node, "dma-masters", dmac_idx); + if (!dma_spec->np) { + dev_err(&pdev->dev, "Can't get DMA master\n"); + return ERR_PTR(-EINVAL); + } + + dev_dbg(&pdev->dev, "Mapping DMAMUX request %u to DMAC%u request %u\n", + map->req_idx, dmac_idx, chan); + + mask = BIT(map->req_idx); + mutex_lock(&dmamux->lock); + dmamux->used_chans |= mask; + ret = r9a06g032_sysctrl_set_dmamux(mask, val ? mask : 0); + mutex_unlock(&dmamux->lock); + if (ret) { + rzn1_dmamux_free(&pdev->dev, map); + return ERR_PTR(ret); + } + + return map; +} + +static const struct of_device_id rzn1_dmac_match[] __maybe_unused = { + { .compatible = "renesas,rzn1-dma" }, + {}, +}; + +static int rzn1_dmamux_probe(struct platform_device *pdev) +{ + struct device_node *mux_node = pdev->dev.of_node; + const struct of_device_id *match; + struct device_node *dmac_node; + struct rzn1_dmamux_data *dmamux; + + dmamux = devm_kzalloc(&pdev->dev, sizeof(*dmamux), GFP_KERNEL); + if (!dmamux) + return -ENOMEM; + + mutex_init(&dmamux->lock); + + dmac_node = of_parse_phandle(mux_node, "dma-masters", 0); + if (!dmac_node) + return dev_err_probe(&pdev->dev, -ENODEV, "Can't get DMA master node\n"); + + match = of_match_node(rzn1_dmac_match, dmac_node); + of_node_put(dmac_node); + if (!match) + return dev_err_probe(&pdev->dev, -EINVAL, "DMA master is not supported\n"); + + dmamux->dmarouter.dev = &pdev->dev; + dmamux->dmarouter.route_free = rzn1_dmamux_free; + + platform_set_drvdata(pdev, dmamux); + + return of_dma_router_register(mux_node, rzn1_dmamux_route_allocate, + &dmamux->dmarouter); +} + +static const struct of_device_id rzn1_dmamux_match[] = { + { .compatible = "renesas,rzn1-dmamux" }, + {}, +}; + +static struct platform_driver rzn1_dmamux_driver = { + .driver = { + .name = "renesas,rzn1-dmamux", + .of_match_table = rzn1_dmamux_match, + }, + .probe = rzn1_dmamux_probe, +}; +module_platform_driver(rzn1_dmamux_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Miquel Raynal <miquel.raynal@bootlin.com"); +MODULE_DESCRIPTION("Renesas RZ/N1 DMAMUX driver");
The Renesas RZN1 DMA IP is a based on a DW core, with eg. an additional dmamux register located in the system control area which can take up to 32 requests (16 per DMA controller). Each DMA channel can be wired to two different peripherals. We need two additional information from the 'dmas' property: the channel (bit in the dmamux register) that must be accessed and the value of the mux for this channel. Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> --- drivers/dma/dw/Kconfig | 8 ++ drivers/dma/dw/Makefile | 2 + drivers/dma/dw/rzn1-dmamux.c | 152 +++++++++++++++++++++++++++++++++++ 3 files changed, 162 insertions(+) create mode 100644 drivers/dma/dw/rzn1-dmamux.c