[PATCH v2 3/4] dma: dw: split driver to library part and platform code

From: Andy Shevchenko
Date: Wed Jun 05 2013 - 08:27:37 EST

To simplify the driver development let's split driver to library and platform
code parts. It helps us to add PCI driver in future.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
Acked-by: Viresh Kumar <viresh.kumar@xxxxxxxxxx>
---
drivers/dma/Makefile | 2 +-
drivers/dma/dw/Kconfig | 8 +-
drivers/dma/dw/Makefile | 6 +-
drivers/dma/dw/{dw_dmac.c => core.c} | 311 ++++-------------------------
drivers/dma/dw/internal.h | 70 +++++++
drivers/dma/dw/platform.c | 317 ++++++++++++++++++++++++++++++
drivers/dma/dw/{dw_dmac_regs.h => regs.h} | 1 +
7 files changed, 436 insertions(+), 279 deletions(-)
rename drivers/dma/dw/{dw_dmac.c => core.c} (85%)
create mode 100644 drivers/dma/dw/internal.h
create mode 100644 drivers/dma/dw/platform.c
rename drivers/dma/dw/{dw_dmac_regs.h => regs.h} (99%)

diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index ac44ca0..6e2a521 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -15,7 +15,7 @@ obj-$(CONFIG_FSL_DMA) += fsldma.o
obj-$(CONFIG_MPC512X_DMA) += mpc512x_dma.o
obj-$(CONFIG_PPC_BESTCOMM) += bestcomm/
obj-$(CONFIG_MV_XOR) += mv_xor.o
-obj-$(CONFIG_DW_DMAC) += dw/
+obj-$(CONFIG_DW_DMAC_CORE) += dw/
obj-$(CONFIG_AT_HDMAC) += at_hdmac.o
obj-$(CONFIG_MX3_IPU) += ipu/
obj-$(CONFIG_TXX9_DMAC) += txx9dmac.o
diff --git a/drivers/dma/dw/Kconfig b/drivers/dma/dw/Kconfig
index 38a215a..efd9e02 100644
--- a/drivers/dma/dw/Kconfig
+++ b/drivers/dma/dw/Kconfig
@@ -2,10 +2,14 @@
# DMA engine configuration for dw
#

-config DW_DMAC
+config DW_DMAC_CORE
tristate "Synopsys DesignWare AHB DMA support"
depends on GENERIC_HARDIRQS
select DMA_ENGINE
+
+config DW_DMAC
+ tristate "Synopsys DesignWare AHB DMA platform driver"
+ select DW_DMAC_CORE
default y if CPU_AT32AP7000
help
Support the Synopsys DesignWare AHB DMA controller. This
@@ -14,7 +18,7 @@ config DW_DMAC
config DW_DMAC_BIG_ENDIAN_IO
bool "Use big endian I/O register access"
default y if AVR32
- depends on DW_DMAC
+ depends on DW_DMAC_CORE
help
Say yes here to use big endian I/O access when reading and writing
to the DMA controller registers. This is needed on some platforms,
diff --git a/drivers/dma/dw/Makefile b/drivers/dma/dw/Makefile
index dd8d993..47f3674 100644
--- a/drivers/dma/dw/Makefile
+++ b/drivers/dma/dw/Makefile
@@ -1 +1,5 @@
-obj-$(CONFIG_DW_DMAC) += dw_dmac.o
+obj-$(CONFIG_DW_DMAC_CORE) += dw_dmac_core.o
+dw_dmac_core-objs := core.o
+
+obj-$(CONFIG_DW_DMAC) += dw_dmac.o
+dw_dmac-objs := platform.o
diff --git a/drivers/dma/dw/dw_dmac.c b/drivers/dma/dw/core.c
similarity index 85%
rename from drivers/dma/dw/dw_dmac.c
rename to drivers/dma/dw/core.c
index 15f3f4f..eea479c 100644
--- a/drivers/dma/dw/dw_dmac.c
+++ b/drivers/dma/dw/core.c
@@ -3,6 +3,7 @@
*
* Copyright (C) 2007-2008 Atmel Corporation
* Copyright (C) 2010-2011 ST Microelectronics
+ * Copyright (C) 2013 Intel Corporation
*
* 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
@@ -19,17 +20,12 @@
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/io.h>
-#include <linux/of.h>
-#include <linux/of_dma.h>
#include <linux/mm.h>
#include <linux/module.h>
-#include <linux/platform_device.h>
#include <linux/slab.h>
-#include <linux/acpi.h>
-#include <linux/acpi_dma.h>

#include "../dmaengine.h"
-#include "dw_dmac_regs.h"
+#include "internal.h"

/*
* This supports the Synopsys "DesignWare AHB Central DMA Controller",
@@ -41,16 +37,6 @@
* which does not support descriptor writeback.
*/

-static inline unsigned int dwc_get_dms(struct dw_dma_slave *slave)
-{
- return slave ? slave->dst_master : 0;
-}
-
-static inline unsigned int dwc_get_sms(struct dw_dma_slave *slave)
-{
- return slave ? slave->src_master : 1;
-}
-
static inline void dwc_set_masters(struct dw_dma_chan *dwc)
{
struct dw_dma *dw = to_dw_dma(dwc->chan.device);
@@ -1225,99 +1211,6 @@ static void dwc_free_chan_resources(struct dma_chan *chan)
dev_vdbg(chan2dev(chan), "%s: done\n", __func__);
}

-/*----------------------------------------------------------------------*/
-
-struct dw_dma_of_filter_args {
- struct dw_dma *dw;
- unsigned int req;
- unsigned int src;
- unsigned int dst;
-};
-
-static bool dw_dma_of_filter(struct dma_chan *chan, void *param)
-{
- struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
- struct dw_dma_of_filter_args *fargs = param;
-
- /* Ensure the device matches our channel */
- if (chan->device != &fargs->dw->dma)
- return false;
-
- dwc->request_line = fargs->req;
- dwc->src_master = fargs->src;
- dwc->dst_master = fargs->dst;
-
- return true;
-}
-
-static struct dma_chan *dw_dma_of_xlate(struct of_phandle_args *dma_spec,
- struct of_dma *ofdma)
-{
- struct dw_dma *dw = ofdma->of_dma_data;
- struct dw_dma_of_filter_args fargs = {
- .dw = dw,
- };
- dma_cap_mask_t cap;
-
- if (dma_spec->args_count != 3)
- return NULL;
-
- fargs.req = dma_spec->args[0];
- fargs.src = dma_spec->args[1];
- fargs.dst = dma_spec->args[2];
-
- if (WARN_ON(fargs.req >= DW_DMA_MAX_NR_REQUESTS ||
- fargs.src >= dw->nr_masters ||
- fargs.dst >= dw->nr_masters))
- return NULL;
-
- dma_cap_zero(cap);
- dma_cap_set(DMA_SLAVE, cap);
-
- /* TODO: there should be a simpler way to do this */
- return dma_request_channel(cap, dw_dma_of_filter, &fargs);
-}
-
-#ifdef CONFIG_ACPI
-static bool dw_dma_acpi_filter(struct dma_chan *chan, void *param)
-{
- struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
- struct acpi_dma_spec *dma_spec = param;
-
- if (chan->device->dev != dma_spec->dev ||
- chan->chan_id != dma_spec->chan_id)
- return false;
-
- dwc->request_line = dma_spec->slave_id;
- dwc->src_master = dwc_get_sms(NULL);
- dwc->dst_master = dwc_get_dms(NULL);
-
- return true;
-}
-
-static void dw_dma_acpi_controller_register(struct dw_dma *dw)
-{
- struct device *dev = dw->dma.dev;
- struct acpi_dma_filter_info *info;
- int ret;
-
- info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
- if (!info)
- return;
-
- dma_cap_zero(info->dma_cap);
- dma_cap_set(DMA_SLAVE, info->dma_cap);
- info->filter_fn = dw_dma_acpi_filter;
-
- ret = devm_acpi_dma_controller_register(dev, acpi_dma_simple_xlate,
- info);
- if (ret)
- dev_err(dev, "could not register acpi_dma_controller\n");
-}
-#else /* !CONFIG_ACPI */
-static inline void dw_dma_acpi_controller_register(struct dw_dma *dw) {}
-#endif /* !CONFIG_ACPI */
-
/* --------------------- Cyclic DMA API extensions -------------------- */

/**
@@ -1598,101 +1491,24 @@ static void dw_dma_off(struct dw_dma *dw)
dw->chan[i].initialized = false;
}

-#ifdef CONFIG_OF
-static struct dw_dma_platform_data *
-dw_dma_parse_dt(struct platform_device *pdev)
-{
- struct device_node *np = pdev->dev.of_node;
- struct dw_dma_platform_data *pdata;
- u32 tmp, arr[4];
-
- if (!np) {
- dev_err(&pdev->dev, "Missing DT data\n");
- return NULL;
- }
-
- pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
- if (!pdata)
- return NULL;
-
- if (of_property_read_u32(np, "dma-channels", &pdata->nr_channels))
- return NULL;
-
- if (of_property_read_bool(np, "is_private"))
- pdata->is_private = true;
-
- if (!of_property_read_u32(np, "chan_allocation_order", &tmp))
- pdata->chan_allocation_order = (unsigned char)tmp;
-
- if (!of_property_read_u32(np, "chan_priority", &tmp))
- pdata->chan_priority = tmp;
-
- if (!of_property_read_u32(np, "block_size", &tmp))
- pdata->block_size = tmp;
-
- if (!of_property_read_u32(np, "dma-masters", &tmp)) {
- if (tmp > 4)
- return NULL;
-
- pdata->nr_masters = tmp;
- }
-
- if (!of_property_read_u32_array(np, "data_width", arr,
- pdata->nr_masters))
- for (tmp = 0; tmp < pdata->nr_masters; tmp++)
- pdata->data_width[tmp] = arr[tmp];
-
- return pdata;
-}
-#else
-static inline struct dw_dma_platform_data *
-dw_dma_parse_dt(struct platform_device *pdev)
+int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata)
{
- return NULL;
-}
-#endif
-
-static int dw_probe(struct platform_device *pdev)
-{
- struct dw_dma_platform_data *pdata;
- struct resource *io;
struct dw_dma *dw;
size_t size;
- void __iomem *regs;
bool autocfg;
unsigned int dw_params;
unsigned int nr_channels;
unsigned int max_blk_size = 0;
- int irq;
int err;
int i;

- irq = platform_get_irq(pdev, 0);
- if (irq < 0)
- return irq;
-
- io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- regs = devm_ioremap_resource(&pdev->dev, io);
- if (IS_ERR(regs))
- return PTR_ERR(regs);
-
- /* Apply default dma_mask if needed */
- if (!pdev->dev.dma_mask) {
- pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
- pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
- }
-
- dw_params = dma_read_byaddr(regs, DW_PARAMS);
+ dw_params = dma_read_byaddr(chip->regs, DW_PARAMS);
autocfg = dw_params >> DW_PARAMS_EN & 0x1;

- dev_dbg(&pdev->dev, "DW_PARAMS: 0x%08x\n", dw_params);
-
- pdata = dev_get_platdata(&pdev->dev);
- if (!pdata)
- pdata = dw_dma_parse_dt(pdev);
+ dev_dbg(chip->dev, "DW_PARAMS: 0x%08x\n", dw_params);

if (!pdata && autocfg) {
- pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ pdata = devm_kzalloc(chip->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return -ENOMEM;

@@ -1709,16 +1525,17 @@ static int dw_probe(struct platform_device *pdev)
nr_channels = pdata->nr_channels;

size = sizeof(struct dw_dma) + nr_channels * sizeof(struct dw_dma_chan);
- dw = devm_kzalloc(&pdev->dev, size, GFP_KERNEL);
+ dw = devm_kzalloc(chip->dev, size, GFP_KERNEL);
if (!dw)
return -ENOMEM;

- dw->clk = devm_clk_get(&pdev->dev, "hclk");
+ dw->clk = devm_clk_get(chip->dev, "hclk");
if (IS_ERR(dw->clk))
return PTR_ERR(dw->clk);
clk_prepare_enable(dw->clk);

- dw->regs = regs;
+ dw->regs = chip->regs;
+ chip->dw = dw;

/* Get hardware configuration parameters */
if (autocfg) {
@@ -1743,18 +1560,16 @@ static int dw_probe(struct platform_device *pdev)
/* Disable BLOCK interrupts as well */
channel_clear_bit(dw, MASK.BLOCK, dw->all_chan_mask);

- err = devm_request_irq(&pdev->dev, irq, dw_dma_interrupt, 0,
+ err = devm_request_irq(chip->dev, chip->irq, dw_dma_interrupt, 0,
"dw_dmac", dw);
if (err)
return err;

- platform_set_drvdata(pdev, dw);
-
/* Create a pool of consistent memory blocks for hardware descriptors */
- dw->desc_pool = dmam_pool_create("dw_dmac_desc_pool", &pdev->dev,
+ dw->desc_pool = dmam_pool_create("dw_dmac_desc_pool", chip->dev,
sizeof(struct dw_desc), 4, 0);
if (!dw->desc_pool) {
- dev_err(&pdev->dev, "No memory for descriptors dma pool\n");
+ dev_err(chip->dev, "No memory for descriptors dma pool\n");
return -ENOMEM;
}

@@ -1795,12 +1610,12 @@ static int dw_probe(struct platform_device *pdev)
/* Hardware configuration */
if (autocfg) {
unsigned int dwc_params;
+ void __iomem *addr = chip->regs + r * sizeof(u32);

- dwc_params = dma_read_byaddr(regs + r * sizeof(u32),
- DWC_PARAMS);
+ dwc_params = dma_read_byaddr(addr, DWC_PARAMS);

- dev_dbg(&pdev->dev, "DWC_PARAMS[%d]: 0x%08x\n", i,
- dwc_params);
+ dev_dbg(chip->dev, "DWC_PARAMS[%d]: 0x%08x\n", i,
+ dwc_params);

/* Decode maximum block size for given channel. The
* stored 4 bit value represents blocks from 0x00 for 3
@@ -1831,7 +1646,7 @@ static int dw_probe(struct platform_device *pdev)
dma_cap_set(DMA_SLAVE, dw->dma.cap_mask);
if (pdata->is_private)
dma_cap_set(DMA_PRIVATE, dw->dma.cap_mask);
- dw->dma.dev = &pdev->dev;
+ dw->dma.dev = chip->dev;
dw->dma.device_alloc_chan_resources = dwc_alloc_chan_resources;
dw->dma.device_free_chan_resources = dwc_free_chan_resources;

@@ -1845,32 +1660,20 @@ static int dw_probe(struct platform_device *pdev)

dma_writel(dw, CFG, DW_CFG_DMA_EN);

- dev_info(&pdev->dev, "DesignWare DMA Controller, %d channels\n",
+ dev_info(chip->dev, "DesignWare DMA Controller, %d channels\n",
nr_channels);

dma_async_device_register(&dw->dma);

- if (pdev->dev.of_node) {
- err = of_dma_controller_register(pdev->dev.of_node,
- dw_dma_of_xlate, dw);
- if (err)
- dev_err(&pdev->dev,
- "could not register of_dma_controller\n");
- }
-
- if (ACPI_HANDLE(&pdev->dev))
- dw_dma_acpi_controller_register(dw);
-
return 0;
}
+EXPORT_SYMBOL_GPL(dw_dma_probe);

-static int dw_remove(struct platform_device *pdev)
+int dw_dma_remove(struct dw_dma_chip *chip)
{
- struct dw_dma *dw = platform_get_drvdata(pdev);
+ struct dw_dma *dw = chip->dw;
struct dw_dma_chan *dwc, *_dwc;

- if (pdev->dev.of_node)
- of_dma_controller_free(pdev->dev.of_node);
dw_dma_off(dw);
dma_async_device_unregister(&dw->dma);

@@ -1884,86 +1687,44 @@ static int dw_remove(struct platform_device *pdev)

return 0;
}
+EXPORT_SYMBOL_GPL(dw_dma_remove);

-static void dw_shutdown(struct platform_device *pdev)
+void dw_dma_shutdown(struct dw_dma_chip *chip)
{
- struct dw_dma *dw = platform_get_drvdata(pdev);
+ struct dw_dma *dw = chip->dw;

dw_dma_off(dw);
clk_disable_unprepare(dw->clk);
}
+EXPORT_SYMBOL_GPL(dw_dma_shutdown);

-static int dw_suspend_noirq(struct device *dev)
+#ifdef CONFIG_PM_SLEEP
+
+int dw_dma_suspend(struct dw_dma_chip *chip)
{
- struct platform_device *pdev = to_platform_device(dev);
- struct dw_dma *dw = platform_get_drvdata(pdev);
+ struct dw_dma *dw = chip->dw;

dw_dma_off(dw);
clk_disable_unprepare(dw->clk);

return 0;
}
+EXPORT_SYMBOL_GPL(dw_dma_suspend);

-static int dw_resume_noirq(struct device *dev)
+int dw_dma_resume(struct dw_dma_chip *chip)
{
- struct platform_device *pdev = to_platform_device(dev);
- struct dw_dma *dw = platform_get_drvdata(pdev);
+ struct dw_dma *dw = chip->dw;

clk_prepare_enable(dw->clk);
dma_writel(dw, CFG, DW_CFG_DMA_EN);

return 0;
}
+EXPORT_SYMBOL_GPL(dw_dma_resume);

-static const struct dev_pm_ops dw_dev_pm_ops = {
- .suspend_noirq = dw_suspend_noirq,
- .resume_noirq = dw_resume_noirq,
- .freeze_noirq = dw_suspend_noirq,
- .thaw_noirq = dw_resume_noirq,
- .restore_noirq = dw_resume_noirq,
- .poweroff_noirq = dw_suspend_noirq,
-};
-
-#ifdef CONFIG_OF
-static const struct of_device_id dw_dma_of_id_table[] = {
- { .compatible = "snps,dma-spear1340" },
- {}
-};
-MODULE_DEVICE_TABLE(of, dw_dma_of_id_table);
-#endif
-
-#ifdef CONFIG_ACPI
-static const struct acpi_device_id dw_dma_acpi_id_table[] = {
- { "INTL9C60", 0 },
- { }
-};
-#endif
-
-static struct platform_driver dw_driver = {
- .probe = dw_probe,
- .remove = dw_remove,
- .shutdown = dw_shutdown,
- .driver = {
- .name = "dw_dmac",
- .pm = &dw_dev_pm_ops,
- .of_match_table = of_match_ptr(dw_dma_of_id_table),
- .acpi_match_table = ACPI_PTR(dw_dma_acpi_id_table),
- },
-};
-
-static int __init dw_init(void)
-{
- return platform_driver_register(&dw_driver);
-}
-subsys_initcall(dw_init);
-
-static void __exit dw_exit(void)
-{
- platform_driver_unregister(&dw_driver);
-}
-module_exit(dw_exit);
+#endif /* CONFIG_PM_SLEEP */

MODULE_LICENSE("GPL v2");
-MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller driver");
+MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller core driver");
MODULE_AUTHOR("Haavard Skinnemoen (Atmel)");
MODULE_AUTHOR("Viresh Kumar <viresh.linux@xxxxxxxxx>");
diff --git a/drivers/dma/dw/internal.h b/drivers/dma/dw/internal.h
new file mode 100644
index 0000000..32667f9
--- /dev/null
+++ b/drivers/dma/dw/internal.h
@@ -0,0 +1,70 @@
+/*
+ * Driver for the Synopsys DesignWare DMA Controller
+ *
+ * Copyright (C) 2013 Intel Corporation
+ *
+ * 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.
+ */
+
+#ifndef _DW_DMAC_INTERNAL_H
+#define _DW_DMAC_INTERNAL_H
+
+#include <linux/device.h>
+#include <linux/dw_dmac.h>
+
+#include "regs.h"
+
+/**
+ * struct dw_dma_chip - representation of DesignWare DMA controller hardware
+ * @dev: struct device of the DMA controller
+ * @irq: irq line
+ * @regs: memory mapped I/O space
+ * @dw: struct dw_dma that is filed by dw_dma_probe()
+ */
+struct dw_dma_chip {
+ struct device *dev;
+ int irq;
+ void __iomem *regs;
+ struct dw_dma *dw;
+};
+
+/* Export to the platform drivers */
+int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata);
+int dw_dma_remove(struct dw_dma_chip *chip);
+
+void dw_dma_shutdown(struct dw_dma_chip *chip);
+
+#ifdef CONFIG_PM_SLEEP
+
+int dw_dma_suspend(struct dw_dma_chip *chip);
+int dw_dma_resume(struct dw_dma_chip *chip);
+
+#endif /* CONFIG_PM_SLEEP */
+
+/**
+ * dwc_get_dms - get destination master
+ * @slave: pointer to the custom slave configuration
+ *
+ * Returns destination master in the custom slave configuration if defined, or
+ * default value otherwise.
+ */
+static inline unsigned int dwc_get_dms(struct dw_dma_slave *slave)
+{
+ return slave ? slave->dst_master : 0;
+}
+
+/**
+ * dwc_get_sms - get source master
+ * @slave: pointer to the custom slave configuration
+ *
+ * Returns source master in the custom slave configuration if defined, or
+ * default value otherwise.
+ */
+static inline unsigned int dwc_get_sms(struct dw_dma_slave *slave)
+{
+ return slave ? slave->src_master : 1;
+}
+
+#endif /* _DW_DMAC_INTERNAL_H */
diff --git a/drivers/dma/dw/platform.c b/drivers/dma/dw/platform.c
new file mode 100644
index 0000000..1168b14
--- /dev/null
+++ b/drivers/dma/dw/platform.c
@@ -0,0 +1,317 @@
+/*
+ * Platform driver for the Synopsys DesignWare DMA Controller
+ *
+ * Copyright (C) 2007-2008 Atmel Corporation
+ * Copyright (C) 2010-2011 ST Microelectronics
+ * Copyright (C) 2013 Intel Corporation
+ *
+ * Some parts of this driver are derived from the original dw_dmac.
+ *
+ * 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/module.h>
+#include <linux/device.h>
+#include <linux/clk.h>
+#include <linux/platform_device.h>
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/of.h>
+#include <linux/of_dma.h>
+#include <linux/acpi.h>
+#include <linux/acpi_dma.h>
+
+#include "internal.h"
+
+struct dw_dma_of_filter_args {
+ struct dw_dma *dw;
+ unsigned int req;
+ unsigned int src;
+ unsigned int dst;
+};
+
+static bool dw_dma_of_filter(struct dma_chan *chan, void *param)
+{
+ struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
+ struct dw_dma_of_filter_args *fargs = param;
+
+ /* Ensure the device matches our channel */
+ if (chan->device != &fargs->dw->dma)
+ return false;
+
+ dwc->request_line = fargs->req;
+ dwc->src_master = fargs->src;
+ dwc->dst_master = fargs->dst;
+
+ return true;
+}
+
+static struct dma_chan *dw_dma_of_xlate(struct of_phandle_args *dma_spec,
+ struct of_dma *ofdma)
+{
+ struct dw_dma *dw = ofdma->of_dma_data;
+ struct dw_dma_of_filter_args fargs = {
+ .dw = dw,
+ };
+ dma_cap_mask_t cap;
+
+ if (dma_spec->args_count != 3)
+ return NULL;
+
+ fargs.req = dma_spec->args[0];
+ fargs.src = dma_spec->args[1];
+ fargs.dst = dma_spec->args[2];
+
+ if (WARN_ON(fargs.req >= DW_DMA_MAX_NR_REQUESTS ||
+ fargs.src >= dw->nr_masters ||
+ fargs.dst >= dw->nr_masters))
+ return NULL;
+
+ dma_cap_zero(cap);
+ dma_cap_set(DMA_SLAVE, cap);
+
+ /* TODO: there should be a simpler way to do this */
+ return dma_request_channel(cap, dw_dma_of_filter, &fargs);
+}
+
+#ifdef CONFIG_ACPI
+static bool dw_dma_acpi_filter(struct dma_chan *chan, void *param)
+{
+ struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
+ struct acpi_dma_spec *dma_spec = param;
+
+ if (chan->device->dev != dma_spec->dev ||
+ chan->chan_id != dma_spec->chan_id)
+ return false;
+
+ dwc->request_line = dma_spec->slave_id;
+ dwc->src_master = dwc_get_sms(NULL);
+ dwc->dst_master = dwc_get_dms(NULL);
+
+ return true;
+}
+
+static void dw_dma_acpi_controller_register(struct dw_dma *dw)
+{
+ struct device *dev = dw->dma.dev;
+ struct acpi_dma_filter_info *info;
+ int ret;
+
+ info = devm_kzalloc(dev, sizeof(*info), GFP_KERNEL);
+ if (!info)
+ return;
+
+ dma_cap_zero(info->dma_cap);
+ dma_cap_set(DMA_SLAVE, info->dma_cap);
+ info->filter_fn = dw_dma_acpi_filter;
+
+ ret = devm_acpi_dma_controller_register(dev, acpi_dma_simple_xlate,
+ info);
+ if (ret)
+ dev_err(dev, "could not register acpi_dma_controller\n");
+}
+#else /* !CONFIG_ACPI */
+static inline void dw_dma_acpi_controller_register(struct dw_dma *dw) {}
+#endif /* !CONFIG_ACPI */
+
+#ifdef CONFIG_OF
+static struct dw_dma_platform_data *
+dw_dma_parse_dt(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct dw_dma_platform_data *pdata;
+ u32 tmp, arr[4];
+
+ if (!np) {
+ dev_err(&pdev->dev, "Missing DT data\n");
+ return NULL;
+ }
+
+ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return NULL;
+
+ if (of_property_read_u32(np, "dma-channels", &pdata->nr_channels))
+ return NULL;
+
+ if (of_property_read_bool(np, "is_private"))
+ pdata->is_private = true;
+
+ if (!of_property_read_u32(np, "chan_allocation_order", &tmp))
+ pdata->chan_allocation_order = (unsigned char)tmp;
+
+ if (!of_property_read_u32(np, "chan_priority", &tmp))
+ pdata->chan_priority = tmp;
+
+ if (!of_property_read_u32(np, "block_size", &tmp))
+ pdata->block_size = tmp;
+
+ if (!of_property_read_u32(np, "dma-masters", &tmp)) {
+ if (tmp > 4)
+ return NULL;
+
+ pdata->nr_masters = tmp;
+ }
+
+ if (!of_property_read_u32_array(np, "data_width", arr,
+ pdata->nr_masters))
+ for (tmp = 0; tmp < pdata->nr_masters; tmp++)
+ pdata->data_width[tmp] = arr[tmp];
+
+ return pdata;
+}
+#else
+static inline struct dw_dma_platform_data *
+dw_dma_parse_dt(struct platform_device *pdev)
+{
+ return NULL;
+}
+#endif
+
+static int dw_probe(struct platform_device *pdev)
+{
+ struct dw_dma_chip *chip;
+ struct device *dev = &pdev->dev;
+ struct resource *mem;
+ struct dw_dma_platform_data *pdata;
+ int err;
+
+ chip = devm_kzalloc(dev, sizeof(*chip), GFP_KERNEL);
+ if (!chip)
+ return -ENOMEM;
+
+ chip->irq = platform_get_irq(pdev, 0);
+ if (chip->irq < 0)
+ return chip->irq;
+
+ mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ chip->regs = devm_ioremap_resource(dev, mem);
+ if (IS_ERR(chip->regs))
+ return PTR_ERR(chip->regs);
+
+ /* Apply default dma_mask if needed */
+ if (!dev->dma_mask) {
+ dev->dma_mask = &dev->coherent_dma_mask;
+ dev->coherent_dma_mask = DMA_BIT_MASK(32);
+ }
+
+ pdata = dev_get_platdata(dev);
+ if (!pdata)
+ pdata = dw_dma_parse_dt(pdev);
+
+ chip->dev = dev;
+
+ err = dw_dma_probe(chip, pdata);
+ if (err)
+ return err;
+
+ platform_set_drvdata(pdev, chip);
+
+ if (pdev->dev.of_node) {
+ err = of_dma_controller_register(pdev->dev.of_node,
+ dw_dma_of_xlate, chip->dw);
+ if (err)
+ dev_err(&pdev->dev,
+ "could not register of_dma_controller\n");
+ }
+
+ if (ACPI_HANDLE(pdev->dev))
+ dw_dma_acpi_controller_register(chip->dw);
+
+ return 0;
+}
+
+static int dw_remove(struct platform_device *pdev)
+{
+ struct dw_dma_chip *chip = platform_get_drvdata(pdev);
+
+ if (pdev->dev.of_node)
+ of_dma_controller_free(pdev->dev.of_node);
+
+ return dw_dma_remove(chip);
+}
+
+static void dw_shutdown(struct platform_device *pdev)
+{
+ struct dw_dma_chip *chip = platform_get_drvdata(pdev);
+
+ dw_dma_shutdown(chip);
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id dw_dma_of_id_table[] = {
+ { .compatible = "snps,dma-spear1340" },
+ {}
+};
+MODULE_DEVICE_TABLE(of, dw_dma_of_id_table);
+#endif
+
+#ifdef CONFIG_ACPI
+static const struct acpi_device_id dw_dma_acpi_id_table[] = {
+ { "INTL9C60", 0 },
+ { }
+};
+#endif
+
+#ifdef CONFIG_PM_SLEEP
+
+static int dw_suspend_noirq(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct dw_dma_chip *chip = platform_get_drvdata(pdev);
+
+ return dw_dma_suspend(chip);
+}
+
+static int dw_resume_noirq(struct device *dev)
+{
+ struct platform_device *pdev = to_platform_device(dev);
+ struct dw_dma_chip *chip = platform_get_drvdata(pdev);
+
+ return dw_dma_resume(chip);
+}
+
+#else /* !CONFIG_PM_SLEEP */
+
+#define dw_suspend_noirq NULL
+#define dw_resume_noirq NULL
+
+#endif /* !CONFIG_PM_SLEEP */
+
+static const struct dev_pm_ops dw_dev_pm_ops = {
+ .suspend_noirq = dw_suspend_noirq,
+ .resume_noirq = dw_resume_noirq,
+ .freeze_noirq = dw_suspend_noirq,
+ .thaw_noirq = dw_resume_noirq,
+ .restore_noirq = dw_resume_noirq,
+ .poweroff_noirq = dw_suspend_noirq,
+};
+
+static struct platform_driver dw_driver = {
+ .probe = dw_probe,
+ .remove = dw_remove,
+ .shutdown = dw_shutdown,
+ .driver = {
+ .name = "dw_dmac",
+ .pm = &dw_dev_pm_ops,
+ .of_match_table = of_match_ptr(dw_dma_of_id_table),
+ .acpi_match_table = ACPI_PTR(dw_dma_acpi_id_table),
+ },
+};
+
+static int __init dw_init(void)
+{
+ return platform_driver_register(&dw_driver);
+}
+subsys_initcall(dw_init);
+
+static void __exit dw_exit(void)
+{
+ platform_driver_unregister(&dw_driver);
+}
+module_exit(dw_exit);
+
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("Synopsys DesignWare DMA Controller platform driver");
diff --git a/drivers/dma/dw/dw_dmac_regs.h b/drivers/dma/dw/regs.h
similarity index 99%
rename from drivers/dma/dw/dw_dmac_regs.h
rename to drivers/dma/dw/regs.h
index 9d41720..07c5a6e 100644
--- a/drivers/dma/dw/dw_dmac_regs.h
+++ b/drivers/dma/dw/regs.h
@@ -9,6 +9,7 @@
* published by the Free Software Foundation.
*/

+#include <linux/interrupt.h>
#include <linux/dmaengine.h>
#include <linux/dw_dmac.h>

--
1.8.2.rc0.22.gb3600c3

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