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>

diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 88d474b..9d5a77c 100644 (file)
--- 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 6a4d6f2..800cb2d 100644 (file)
--- 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 (file)
index 0000000..761f326
--- /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);