shdma: add R-Car Audio DMAC peri peri driver

Add support Audio DMAC peri peri driver
for Renesas R-Car Gen2 SoC, using 'shdma-base'
DMA driver framework.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
[fixed checkpatch error]
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

3 files changed, 327 insertions, 0 deletions

diff --git a/drivers/dma/sh/Kconfig b/drivers/dma/sh/Kconfig
index dadd9e010c0b..b4c813831006 100644
--- a/drivers/dma/sh/Kconfig
+++ b/drivers/dma/sh/Kconfig
@@ -29,6 +29,12 @@ config RCAR_HPB_DMAE
         help
           Enable support for the Renesas R-Car series DMA controllers.
 
+config RCAR_AUDMAC_PP
+        tristate "Renesas R-Car Audio DMAC Peripheral Peripheral support"
+        depends on SH_DMAE_BASE
+        help
+          Enable support for the Renesas R-Car Audio DMAC Peripheral Peripheral controllers.
+
 config SHDMA_R8A73A4
         def_bool y
         depends on ARCH_R8A73A4 && SH_DMAE != n
diff --git a/drivers/dma/sh/Makefile b/drivers/dma/sh/Makefile
index e856af23b789..1ce88b28cfc6 100644
--- a/drivers/dma/sh/Makefile
+++ b/drivers/dma/sh/Makefile
@@ -7,3 +7,4 @@ endif
 shdma-objs := $(shdma-y)
 obj-$(CONFIG_SUDMAC) += sudmac.o
 obj-$(CONFIG_RCAR_HPB_DMAE) += rcar-hpbdma.o
+obj-$(CONFIG_RCAR_AUDMAC_PP) += rcar-audmapp.o
diff --git a/drivers/dma/sh/rcar-audmapp.c b/drivers/dma/sh/rcar-audmapp.c
new file mode 100644
index 000000000000..2de77289a2e9
--- /dev/null
+++ b/drivers/dma/sh/rcar-audmapp.c
@@ -0,0 +1,320 @@
+/*
+ * This is for Renesas R-Car Audio-DMAC-peri-peri.
+ *
+ * Copyright (C) 2014 Renesas Electronics Corporation
+ * Copyright (C) 2014 Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
+ *
+ * based on the drivers/dma/sh/shdma.c
+ *
+ * Copyright (C) 2011-2012 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
+ * Copyright (C) 2009 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com>
+ * Copyright (C) 2009 Renesas Solutions, Inc. All rights reserved.
+ * Copyright (C) 2007 Freescale Semiconductor, Inc. All rights reserved.
+ *
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+#include <linux/delay.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/dmaengine.h>
+#include <linux/platform_data/dma-rcar-audmapp.h>
+#include <linux/platform_device.h>
+#include <linux/shdma-base.h>
+
+/*
+ * DMA register
+ */
+#define PDMASAR         0x00
+#define PDMADAR         0x04
+#define PDMACHCR        0x0c
+
+/* PDMACHCR */
+#define PDMACHCR_DE             (1 << 0)
+
+#define AUDMAPP_MAX_CHANNELS    29
+
+/* Default MEMCPY transfer size = 2^2 = 4 bytes */
+#define LOG2_DEFAULT_XFER_SIZE  2
+#define AUDMAPP_SLAVE_NUMBER    256
+#define AUDMAPP_LEN_MAX         (16 * 1024 * 1024)
+
+struct audmapp_chan {
+        struct shdma_chan shdma_chan;
+        struct audmapp_slave_config *config;
+        void __iomem *base;
+};
+
+struct audmapp_device {
+        struct shdma_dev shdma_dev;
+        struct audmapp_pdata *pdata;
+        struct device *dev;
+        void __iomem *chan_reg;
+};
+
+#define to_chan(chan) container_of(chan, struct audmapp_chan, shdma_chan)
+#define to_dev(chan) container_of(chan->shdma_chan.dma_chan.device,     \
+                                  struct audmapp_device, shdma_dev.dma_dev)
+
+static void audmapp_write(struct audmapp_chan *auchan, u32 data, u32 reg)
+{
+        struct audmapp_device *audev = to_dev(auchan);
+        struct device *dev = audev->dev;
+
+        dev_dbg(dev, "w %p : %08x\n", auchan->base + reg, data);
+
+        iowrite32(data, auchan->base + reg);
+}
+
+static u32 audmapp_read(struct audmapp_chan *auchan, u32 reg)
+{
+        return ioread32(auchan->base + reg);
+}
+
+static void audmapp_halt(struct shdma_chan *schan)
+{
+        struct audmapp_chan *auchan = to_chan(schan);
+        int i;
+
+        audmapp_write(auchan, 0, PDMACHCR);
+
+        for (i = 0; i < 1024; i++) {
+                if (0 == audmapp_read(auchan, PDMACHCR))
+                        return;
+                udelay(1);
+        }
+}
+
+static void audmapp_start_xfer(struct shdma_chan *schan,
+                               struct shdma_desc *sdecs)
+{
+        struct audmapp_chan *auchan = to_chan(schan);
+        struct audmapp_device *audev = to_dev(auchan);
+        struct audmapp_slave_config *cfg = auchan->config;
+        struct device *dev = audev->dev;
+        u32 chcr = cfg->chcr | PDMACHCR_DE;
+
+        dev_dbg(dev, "src/dst/chcr = %pad/%pad/%x\n",
+                &cfg->src, &cfg->dst, cfg->chcr);
+
+        audmapp_write(auchan, cfg->src, PDMASAR);
+        audmapp_write(auchan, cfg->dst, PDMADAR);
+        audmapp_write(auchan, chcr,     PDMACHCR);
+}
+
+static struct audmapp_slave_config *
+audmapp_find_slave(struct audmapp_chan *auchan, int slave_id)
+{
+        struct audmapp_device *audev = to_dev(auchan);
+        struct audmapp_pdata *pdata = audev->pdata;
+        struct audmapp_slave_config *cfg;
+        int i;
+
+        if (slave_id >= AUDMAPP_SLAVE_NUMBER)
+                return NULL;
+
+        for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++)
+                if (cfg->slave_id == slave_id)
+                        return cfg;
+
+        return NULL;
+}
+
+static int audmapp_set_slave(struct shdma_chan *schan, int slave_id,
+                             dma_addr_t slave_addr, bool try)
+{
+        struct audmapp_chan *auchan = to_chan(schan);
+        struct audmapp_slave_config *cfg =
+                audmapp_find_slave(auchan, slave_id);
+
+        if (!cfg)
+                return -ENODEV;
+        if (try)
+                return 0;
+
+        auchan->config  = cfg;
+
+        return 0;
+}
+
+static int audmapp_desc_setup(struct shdma_chan *schan,
+                              struct shdma_desc *sdecs,
+                              dma_addr_t src, dma_addr_t dst, size_t *len)
+{
+        struct audmapp_chan *auchan = to_chan(schan);
+        struct audmapp_slave_config *cfg = auchan->config;
+
+        if (!cfg)
+                return -ENODEV;
+
+        if (*len > (size_t)AUDMAPP_LEN_MAX)
+                *len = (size_t)AUDMAPP_LEN_MAX;
+
+        return 0;
+}
+
+static void audmapp_setup_xfer(struct shdma_chan *schan,
+                               int slave_id)
+{
+}
+
+static dma_addr_t audmapp_slave_addr(struct shdma_chan *schan)
+{
+        return 0; /* always fixed address */
+}
+
+static bool audmapp_channel_busy(struct shdma_chan *schan)
+{
+        struct audmapp_chan *auchan = to_chan(schan);
+        u32 chcr = audmapp_read(auchan, PDMACHCR);
+
+        return chcr & ~PDMACHCR_DE;
+}
+
+static bool audmapp_desc_completed(struct shdma_chan *schan,
+                                   struct shdma_desc *sdesc)
+{
+        return true;
+}
+
+static struct shdma_desc *audmapp_embedded_desc(void *buf, int i)
+{
+        return &((struct shdma_desc *)buf)[i];
+}
+
+static const struct shdma_ops audmapp_shdma_ops = {
+        .halt_channel   = audmapp_halt,
+        .desc_setup     = audmapp_desc_setup,
+        .set_slave      = audmapp_set_slave,
+        .start_xfer     = audmapp_start_xfer,
+        .embedded_desc  = audmapp_embedded_desc,
+        .setup_xfer     = audmapp_setup_xfer,
+        .slave_addr     = audmapp_slave_addr,
+        .channel_busy   = audmapp_channel_busy,
+        .desc_completed = audmapp_desc_completed,
+};
+
+static int audmapp_chan_probe(struct platform_device *pdev,
+                              struct audmapp_device *audev, int id)
+{
+        struct shdma_dev *sdev = &audev->shdma_dev;
+        struct audmapp_chan *auchan;
+        struct shdma_chan *schan;
+        struct device *dev = audev->dev;
+
+        auchan = devm_kzalloc(dev, sizeof(*auchan), GFP_KERNEL);
+        if (!auchan)
+                return -ENOMEM;
+
+        schan = &auchan->shdma_chan;
+        schan->max_xfer_len = AUDMAPP_LEN_MAX;
+
+        shdma_chan_probe(sdev, schan, id);
+
+        auchan->base = audev->chan_reg + 0x20 + (0x10 * id);
+        dev_dbg(dev, "%02d : %p / %p", id, auchan->base, audev->chan_reg);
+
+        return 0;
+}
+
+static void audmapp_chan_remove(struct audmapp_device *audev)
+{
+        struct dma_device *dma_dev = &audev->shdma_dev.dma_dev;
+        struct shdma_chan *schan;
+        int i;
+
+        shdma_for_each_chan(schan, &audev->shdma_dev, i) {
+                BUG_ON(!schan);
+                shdma_chan_remove(schan);
+        }
+        dma_dev->chancnt = 0;
+}
+
+static int audmapp_probe(struct platform_device *pdev)
+{
+        struct audmapp_pdata *pdata = pdev->dev.platform_data;
+        struct audmapp_device *audev;
+        struct shdma_dev *sdev;
+        struct dma_device *dma_dev;
+        struct resource *res;
+        int err, i;
+
+        if (!pdata)
+                return -ENODEV;
+
+        res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+
+        audev = devm_kzalloc(&pdev->dev, sizeof(*audev), GFP_KERNEL);
+        if (!audev)
+                return -ENOMEM;
+
+        audev->dev      = &pdev->dev;
+        audev->pdata    = pdata;
+        audev->chan_reg = devm_ioremap_resource(&pdev->dev, res);
+        if (IS_ERR(audev->chan_reg))
+                return PTR_ERR(audev->chan_reg);
+
+        sdev            = &audev->shdma_dev;
+        sdev->ops       = &audmapp_shdma_ops;
+        sdev->desc_size = sizeof(struct shdma_desc);
+
+        dma_dev                 = &sdev->dma_dev;
+        dma_dev->copy_align     = LOG2_DEFAULT_XFER_SIZE;
+        dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
+
+        err = shdma_init(&pdev->dev, sdev, AUDMAPP_MAX_CHANNELS);
+        if (err < 0)
+                return err;
+
+        platform_set_drvdata(pdev, audev);
+
+        /* Create DMA Channel */
+        for (i = 0; i < AUDMAPP_MAX_CHANNELS; i++) {
+                err = audmapp_chan_probe(pdev, audev, i);
+                if (err)
+                        goto chan_probe_err;
+        }
+
+        err = dma_async_device_register(dma_dev);
+        if (err < 0)
+                goto chan_probe_err;
+
+        return err;
+
+chan_probe_err:
+        audmapp_chan_remove(audev);
+        shdma_cleanup(sdev);
+
+        return err;
+}
+
+static int audmapp_remove(struct platform_device *pdev)
+{
+        struct audmapp_device *audev = platform_get_drvdata(pdev);
+        struct dma_device *dma_dev = &audev->shdma_dev.dma_dev;
+
+        dma_async_device_unregister(dma_dev);
+
+        audmapp_chan_remove(audev);
+        shdma_cleanup(&audev->shdma_dev);
+
+        return 0;
+}
+
+static struct platform_driver audmapp_driver = {
+        .probe          = audmapp_probe,
+        .remove         = audmapp_remove,
+        .driver         = {
+                .owner  = THIS_MODULE,
+                .name   = "rcar-audmapp-engine",
+        },
+};
+module_platform_driver(audmapp_driver);
+
+MODULE_AUTHOR("Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>");
+MODULE_DESCRIPTION("Renesas R-Car Audio DMAC peri-peri driver");
+MODULE_LICENSE("GPL");