dmaengine: add driver for lpc18xx dmamux

Add support for DMA on NXP LPC18xx/43xx platforms which has
a multiplexer in front of the PL080 dma request lines.

The mux is a single register in the LPC18xx/43xx CREG block
and can multiplex up to 4 request lines to each of the 16
lines on the PL080.

Signed-off-by: Joachim Eastwood <manabian@gmail.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 88d474b78076..9d5a77cb9715 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -63,6 +63,15 @@ config AMBA_PL08X
           Platform has a PL08x DMAC device
           which can provide DMA engine support
 
+config LPC18XX_DMAMUX
+        bool "NXP LPC18xx/43xx DMA MUX for PL080"
+        depends on ARCH_LPC18XX || COMPILE_TEST
+        depends on OF && AMBA_PL08X
+        select MFD_SYSCON
+        help
+          Enable support for DMA on NXP LPC18xx/43xx platforms
+          with PL080 and multiplexed DMA request lines.
+
 config INTEL_IOATDMA
         tristate "Intel I/OAT DMA support"
         depends on PCI && X86
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index 6a4d6f2827da..800cb2d20be8 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -32,6 +32,7 @@ obj-$(CONFIG_TI_EDMA) += edma.o
 obj-$(CONFIG_STE_DMA40) += ste_dma40.o ste_dma40_ll.o
 obj-$(CONFIG_TEGRA20_APB_DMA) += tegra20-apb-dma.o
 obj-$(CONFIG_S3C24XX_DMAC) += s3c24xx-dma.o
+obj-$(CONFIG_LPC18XX_DMAMUX) += lpc18xx-dmamux.o
 obj-$(CONFIG_PL330_DMA) += pl330.o
 obj-$(CONFIG_PCH_DMA) += pch_dma.o
 obj-$(CONFIG_AMBA_PL08X) += amba-pl08x.o
diff --git a/drivers/dma/lpc18xx-dmamux.c b/drivers/dma/lpc18xx-dmamux.c
new file mode 100644
index 000000000000..761f32687055
--- /dev/null
+++ b/drivers/dma/lpc18xx-dmamux.c
@@ -0,0 +1,183 @@
+/*
+ * DMA Router driver for LPC18xx/43xx DMA MUX
+ *
+ * Copyright (C) 2015 Joachim Eastwood <manabian@gmail.com>
+ *
+ * Based on TI DMA Crossbar driver by:
+ *   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/err.h>
+#include <linux/init.h>
+#include <linux/mfd/syscon.h>
+#include <linux/of_device.h>
+#include <linux/of_dma.h>
+#include <linux/regmap.h>
+#include <linux/spinlock.h>
+
+/* CREG register offset and macros for mux manipulation */
+#define LPC18XX_CREG_DMAMUX             0x11c
+#define LPC18XX_DMAMUX_VAL(v, n)        ((v) << (n * 2))
+#define LPC18XX_DMAMUX_MASK(n)          (0x3 << (n * 2))
+#define LPC18XX_DMAMUX_MAX_VAL          0x3
+
+struct lpc18xx_dmamux {
+        u32 value;
+        bool busy;
+};
+
+struct lpc18xx_dmamux_data {
+        struct dma_router dmarouter;
+        struct lpc18xx_dmamux *muxes;
+        u32 dma_master_requests;
+        u32 dma_mux_requests;
+        struct regmap *reg;
+        spinlock_t lock;
+};
+
+static void lpc18xx_dmamux_free(struct device *dev, void *route_data)
+{
+        struct lpc18xx_dmamux_data *dmamux = dev_get_drvdata(dev);
+        struct lpc18xx_dmamux *mux = route_data;
+        unsigned long flags;
+
+        spin_lock_irqsave(&dmamux->lock, flags);
+        mux->busy = false;
+        spin_unlock_irqrestore(&dmamux->lock, flags);
+}
+
+static void *lpc18xx_dmamux_reserve(struct of_phandle_args *dma_spec,
+                                    struct of_dma *ofdma)
+{
+        struct platform_device *pdev = of_find_device_by_node(ofdma->of_node);
+        struct lpc18xx_dmamux_data *dmamux = platform_get_drvdata(pdev);
+        unsigned long flags;
+        unsigned mux;
+
+        if (dma_spec->args_count != 3) {
+                dev_err(&pdev->dev, "invalid number of dma mux args\n");
+                return ERR_PTR(-EINVAL);
+        }
+
+        mux = dma_spec->args[0];
+        if (mux >= dmamux->dma_master_requests) {
+                dev_err(&pdev->dev, "invalid mux number: %d\n",
+                        dma_spec->args[0]);
+                return ERR_PTR(-EINVAL);
+        }
+
+        if (dma_spec->args[1] > LPC18XX_DMAMUX_MAX_VAL) {
+                dev_err(&pdev->dev, "invalid dma mux value: %d\n",
+                        dma_spec->args[1]);
+                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);
+        }
+
+        spin_lock_irqsave(&dmamux->lock, flags);
+        if (dmamux->muxes[mux].busy) {
+                spin_unlock_irqrestore(&dmamux->lock, flags);
+                dev_err(&pdev->dev, "dma request %u busy with %u.%u\n",
+                        mux, mux, dmamux->muxes[mux].value);
+                of_node_put(dma_spec->np);
+                return ERR_PTR(-EBUSY);
+        }
+
+        dmamux->muxes[mux].busy = true;
+        dmamux->muxes[mux].value = dma_spec->args[1];
+
+        regmap_update_bits(dmamux->reg, LPC18XX_CREG_DMAMUX,
+                           LPC18XX_DMAMUX_MASK(mux),
+                           LPC18XX_DMAMUX_VAL(dmamux->muxes[mux].value, mux));
+        spin_unlock_irqrestore(&dmamux->lock, flags);
+
+        dma_spec->args[1] = dma_spec->args[2];
+        dma_spec->args_count = 2;
+
+        dev_dbg(&pdev->dev, "mapping dmamux %u.%u to dma request %u\n", mux,
+                dmamux->muxes[mux].value, mux);
+
+        return &dmamux->muxes[mux];
+}
+
+static int lpc18xx_dmamux_probe(struct platform_device *pdev)
+{
+        struct device_node *dma_np, *np = pdev->dev.of_node;
+        struct lpc18xx_dmamux_data *dmamux;
+        int ret;
+
+        dmamux = devm_kzalloc(&pdev->dev, sizeof(*dmamux), GFP_KERNEL);
+        if (!dmamux)
+                return -ENOMEM;
+
+        dmamux->reg = syscon_regmap_lookup_by_compatible("nxp,lpc1850-creg");
+        if (IS_ERR(dmamux->reg)) {
+                dev_err(&pdev->dev, "syscon lookup failed\n");
+                return PTR_ERR(dmamux->reg);
+        }
+
+        ret = of_property_read_u32(np, "dma-requests",
+                                   &dmamux->dma_mux_requests);
+        if (ret) {
+                dev_err(&pdev->dev, "missing dma-requests property\n");
+                return ret;
+        }
+
+        dma_np = of_parse_phandle(np, "dma-masters", 0);
+        if (!dma_np) {
+                dev_err(&pdev->dev, "can't get dma master\n");
+                return -ENODEV;
+        }
+
+        ret = of_property_read_u32(dma_np, "dma-requests",
+                                   &dmamux->dma_master_requests);
+        of_node_put(dma_np);
+        if (ret) {
+                dev_err(&pdev->dev, "missing master dma-requests property\n");
+                return ret;
+        }
+
+        dmamux->muxes = devm_kcalloc(&pdev->dev, dmamux->dma_master_requests,
+                                     sizeof(struct lpc18xx_dmamux),
+                                     GFP_KERNEL);
+        if (!dmamux->muxes)
+                return -ENOMEM;
+
+        spin_lock_init(&dmamux->lock);
+        platform_set_drvdata(pdev, dmamux);
+        dmamux->dmarouter.dev = &pdev->dev;
+        dmamux->dmarouter.route_free = lpc18xx_dmamux_free;
+
+        return of_dma_router_register(np, lpc18xx_dmamux_reserve,
+                                      &dmamux->dmarouter);
+}
+
+static const struct of_device_id lpc18xx_dmamux_match[] = {
+        { .compatible = "nxp,lpc1850-dmamux" },
+        {},
+};
+
+static struct platform_driver lpc18xx_dmamux_driver = {
+        .probe  = lpc18xx_dmamux_probe,
+        .driver = {
+                .name = "lpc18xx-dmamux",
+                .of_match_table = lpc18xx_dmamux_match,
+        },
+};
+
+static int __init lpc18xx_dmamux_init(void)
+{
+        return platform_driver_register(&lpc18xx_dmamux_driver);
+}
+arch_initcall(lpc18xx_dmamux_init);