dmaengine: Add driver for TI DMA crossbar on DRA7x

The DRA7x has more peripherals with DMA requests than the sDMA can handle:
205 vs 127. All DMA requests are routed through the DMA crossbar, which can
be configured to route selected incoming DMA requests to specific sDMA
request.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index fd7ac13f2574ab0aab2ecf0c5f6b38019459da99..681651aed320c5b9794c787b01a43adf418e842a 100644 (file)
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -245,6 +245,9 @@ config TI_EDMA
          Enable support for the TI EDMA controller. This DMA
          engine is found on TI DaVinci and AM33xx parts.
 
+config TI_DMA_CROSSBAR
+       bool
+
 config ARCH_HAS_ASYNC_TX_FIND_CHANNEL
        bool
 
@@ -330,6 +333,7 @@ config DMA_OMAP
        depends on ARCH_OMAP
        select DMA_ENGINE
        select DMA_VIRTUAL_CHANNELS
+       select TI_DMA_CROSSBAR if SOC_DRA7XX
 
 config DMA_BCM2835
        tristate "BCM2835 DMA engine support"

diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index 69f77d5ba53bb00ede8ea1ea0ed4a003e90d7f19..535919559f128e6ec76b38b1337cd7f4d6b70222 100644 (file)
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -38,6 +38,7 @@ obj-$(CONFIG_EP93XX_DMA) += ep93xx_dma.o
 obj-$(CONFIG_DMA_SA11X0) += sa11x0-dma.o
 obj-$(CONFIG_MMP_TDMA) += mmp_tdma.o
 obj-$(CONFIG_DMA_OMAP) += omap-dma.o
+obj-$(CONFIG_TI_DMA_CROSSBAR) += ti-dma-crossbar.o
 obj-$(CONFIG_DMA_BCM2835) += bcm2835-dma.o
 obj-$(CONFIG_MMP_PDMA) += mmp_pdma.o
 obj-$(CONFIG_DMA_JZ4740) += dma-jz4740.o

diff --git a/drivers/dma/ti-dma-crossbar.c b/drivers/dma/ti-dma-crossbar.c
new file mode 100644 (file)
index 0000000..24f5ca2
--- /dev/null
+++ b/drivers/dma/ti-dma-crossbar.c
@@ -0,0 +1,188 @@
+/*
+ *  Copyright (C) 2015 Texas Instruments Incorporated - http://www.ti.com
+ *  Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+#include <linux/slab.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/list.h>
+#include <linux/io.h>
+#include <linux/idr.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+#include <linux/of_dma.h>
+
+#define TI_XBAR_OUTPUTS        127
+#define TI_XBAR_INPUTS 256
+
+static DEFINE_IDR(map_idr);
+
+struct ti_dma_xbar_data {
+       void __iomem *iomem;
+
+       struct dma_router dmarouter;
+
+       u16 safe_val; /* Value to rest the crossbar lines */
+       u32 xbar_requests; /* number of DMA requests connected to XBAR */
+       u32 dma_requests; /* number of DMA requests forwarded to DMA */
+};
+
+struct ti_dma_xbar_map {
+       u16 xbar_in;
+       int xbar_out;
+};
+
+static inline void ti_dma_xbar_write(void __iomem *iomem, int xbar, u16 val)
+{
+       writew_relaxed(val, iomem + (xbar * 2));
+}
+
+static void ti_dma_xbar_free(struct device *dev, void *route_data)
+{
+       struct ti_dma_xbar_data *xbar = dev_get_drvdata(dev);
+       struct ti_dma_xbar_map *map = route_data;
+
+       dev_dbg(dev, "Unmapping XBAR%u (was routed to %d)\n",
+               map->xbar_in, map->xbar_out);
+
+       ti_dma_xbar_write(xbar->iomem, map->xbar_out, xbar->safe_val);
+       idr_remove(&map_idr, map->xbar_out);
+       kfree(map);
+}
+
+static void *ti_dma_xbar_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 ti_dma_xbar_data *xbar = platform_get_drvdata(pdev);
+       struct ti_dma_xbar_map *map;
+
+       if (dma_spec->args[0] >= xbar->xbar_requests) {
+               dev_err(&pdev->dev, "Invalid XBAR request number: %d\n",
+                       dma_spec->args[0]);
+               return ERR_PTR(-EINVAL);
+       }
+
+       /* The of_node_put() will be done in the core for the node */
+       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) {
+               of_node_put(dma_spec->np);
+               return ERR_PTR(-ENOMEM);
+       }
+
+       map->xbar_out = idr_alloc(&map_idr, NULL, 0, xbar->dma_requests,
+                                 GFP_KERNEL);
+       map->xbar_in = (u16)dma_spec->args[0];
+
+       /* The DMA request is 1 based in sDMA */
+       dma_spec->args[0] = map->xbar_out + 1;
+
+       dev_dbg(&pdev->dev, "Mapping XBAR%u to DMA%d\n",
+               map->xbar_in, map->xbar_out);
+
+       ti_dma_xbar_write(xbar->iomem, map->xbar_out, map->xbar_in);
+
+       return map;
+}
+
+static int ti_dma_xbar_probe(struct platform_device *pdev)
+{
+       struct device_node *node = pdev->dev.of_node;
+       struct device_node *dma_node;
+       struct ti_dma_xbar_data *xbar;
+       struct resource *res;
+       u32 safe_val;
+       void __iomem *iomem;
+       int i, ret;
+
+       if (!node)
+               return -ENODEV;
+
+       xbar = devm_kzalloc(&pdev->dev, sizeof(*xbar), GFP_KERNEL);
+       if (!xbar)
+               return -ENOMEM;
+
+       dma_node = of_parse_phandle(node, "dma-masters", 0);
+       if (!dma_node) {
+               dev_err(&pdev->dev, "Can't get DMA master node\n");
+               return -ENODEV;
+       }
+
+       if (of_property_read_u32(dma_node, "dma-requests",
+                                &xbar->dma_requests)) {
+               dev_info(&pdev->dev,
+                        "Missing XBAR output information, using %u.\n",
+                        TI_XBAR_OUTPUTS);
+               xbar->dma_requests = TI_XBAR_OUTPUTS;
+       }
+       of_node_put(dma_node);
+
+       if (of_property_read_u32(node, "dma-requests", &xbar->xbar_requests)) {
+               dev_info(&pdev->dev,
+                        "Missing XBAR input information, using %u.\n",
+                        TI_XBAR_INPUTS);
+               xbar->xbar_requests = TI_XBAR_INPUTS;
+       }
+
+       if (!of_property_read_u32(node, "ti,dma-safe-map", &safe_val))
+               xbar->safe_val = (u16)safe_val;
+
+       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+       if (!res)
+               return -ENODEV;
+
+       iomem = devm_ioremap_resource(&pdev->dev, res);
+       if (!iomem)
+               return -ENOMEM;
+
+       xbar->iomem = iomem;
+
+       xbar->dmarouter.dev = &pdev->dev;
+       xbar->dmarouter.route_free = ti_dma_xbar_free;
+
+       platform_set_drvdata(pdev, xbar);
+
+       /* Reset the crossbar */
+       for (i = 0; i < xbar->dma_requests; i++)
+               ti_dma_xbar_write(xbar->iomem, i, xbar->safe_val);
+
+       ret = of_dma_router_register(node, ti_dma_xbar_route_allocate,
+                                    &xbar->dmarouter);
+       if (ret) {
+               /* Restore the defaults for the crossbar */
+               for (i = 0; i < xbar->dma_requests; i++)
+                       ti_dma_xbar_write(xbar->iomem, i, i);
+       }
+
+       return ret;
+}
+
+static const struct of_device_id ti_dma_xbar_match[] = {
+       { .compatible = "ti,dra7-dma-crossbar" },
+       {},
+};
+
+static struct platform_driver ti_dma_xbar_driver = {
+       .driver = {
+               .name = "ti-dma-crossbar",
+               .of_match_table = of_match_ptr(ti_dma_xbar_match),
+       },
+       .probe  = ti_dma_xbar_probe,
+};
+
+int omap_dmaxbar_init(void)
+{
+       return platform_driver_register(&ti_dma_xbar_driver);
+}
+arch_initcall(omap_dmaxbar_init);