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>

3 files changed, 193 insertions, 0 deletions

diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index fd7ac13f2574..681651aed320 100644
--- 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 69f77d5ba53b..535919559f12 100644
--- 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
index 000000000000..24f5ca2356bf
--- /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);