Merge branch 'for-linus' of git://git.infradead.org/users/vkoul/slave-dma
Merge commit. Changes below are compared with the first parent: e9e352e9.
Changes
30 files changed · +1885 −202
Only the first 600 diff lines are shown. Download the complete patch.
Documentation/devicetree/bindings/dma/bcm2835-dma.txt
View filediff --git a/Documentation/devicetree/bindings/dma/bcm2835-dma.txt b/Documentation/devicetree/bindings/dma/bcm2835-dma.txt
new file mode 100644
index 0000000..1396078
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/bcm2835-dma.txt
@@ -0,0 +1,57 @@
+* BCM2835 DMA controller
+
+The BCM2835 DMA controller has 16 channels in total.
+Only the lower 13 channels have an associated IRQ.
+Some arbitrary channels are used by the firmware
+(1,3,6,7 in the current firmware version).
+The channels 0,2 and 3 have special functionality
+and should not be used by the driver.
+
+Required properties:
+- compatible: Should be "brcm,bcm2835-dma".
+- reg: Should contain DMA registers location and length.
+- interrupts: Should contain the DMA interrupts associated
+ to the DMA channels in ascending order.
+- #dma-cells: Must be <1>, the cell in the dmas property of the
+ client device represents the DREQ number.
+- brcm,dma-channel-mask: Bit mask representing the channels
+ not used by the firmware in ascending order,
+ i.e. first channel corresponds to LSB.
+
+Example:
+
+dma: dma@7e007000 {
+ compatible = "brcm,bcm2835-dma";
+ reg = <0x7e007000 0xf00>;
+ interrupts = <1 16>,
+ <1 17>,
+ <1 18>,
+ <1 19>,
+ <1 20>,
+ <1 21>,
+ <1 22>,
+ <1 23>,
+ <1 24>,
+ <1 25>,
+ <1 26>,
+ <1 27>,
+ <1 28>;
+
+ #dma-cells = <1>;
+ brcm,dma-channel-mask = <0x7f35>;
+};
+
+DMA clients connected to the BCM2835 DMA controller must use the format
+described in the dma.txt file, using a two-cell specifier for each channel.
+
+Example:
+
+bcm2835_i2s: i2s@7e203000 {
+ compatible = "brcm,bcm2835-i2s";
+ reg = < 0x7e203000 0x20>,
+ < 0x7e101098 0x02>;
+
+ dmas = <&dma 2>,
+ <&dma 3>;
+ dma-names = "tx", "rx";
+};
Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt
View filediff --git a/Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt b/Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt
index 4fa814d..68b83ec 100644
--- a/Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt
+++ b/Documentation/devicetree/bindings/dma/fsl-imx-sdma.txt
@@ -42,6 +42,7 @@ The full ID of peripheral types can be found below.
19 IPU Memory
20 ASRC
21 ESAI
+ 22 SSI Dual FIFO (needs firmware ver >= 2)
The third cell specifies the transfer priority as below.
Documentation/devicetree/bindings/dma/moxa,moxart-dma.txt
View filediff --git a/Documentation/devicetree/bindings/dma/moxa,moxart-dma.txt b/Documentation/devicetree/bindings/dma/moxa,moxart-dma.txt
new file mode 100644
index 0000000..8a9f355
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/moxa,moxart-dma.txt
@@ -0,0 +1,45 @@
+MOXA ART DMA Controller
+
+See dma.txt first
+
+Required properties:
+
+- compatible : Must be "moxa,moxart-dma"
+- reg : Should contain registers location and length
+- interrupts : Should contain an interrupt-specifier for the sole
+ interrupt generated by the device
+- #dma-cells : Should be 1, a single cell holding a line request number
+
+Example:
+
+ dma: dma@90500000 {
+ compatible = "moxa,moxart-dma";
+ reg = <0x90500080 0x40>;
+ interrupts = <24 0>;
+ #dma-cells = <1>;
+ };
+
+
+Clients:
+
+DMA clients connected to the MOXA ART DMA controller must use the format
+described in the dma.txt file, using a two-cell specifier for each channel:
+a phandle plus one integer cells.
+The two cells in order are:
+
+1. A phandle pointing to the DMA controller.
+2. Peripheral identifier for the hardware handshaking interface.
+
+Example:
+Use specific request line passing from dma
+For example, MMC request line is 5
+
+ sdhci: sdhci@98e00000 {
+ compatible = "moxa,moxart-sdhci";
+ reg = <0x98e00000 0x5C>;
+ interrupts = <5 0>;
+ clocks = <&clk_apb>;
+ dmas = <&dma 5>,
+ <&dma 5>;
+ dma-names = "tx", "rx";
+ };
drivers/dma/Kconfig
View filediff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index c10eb89..9bed1a2 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -306,6 +306,12 @@ config DMA_OMAP
select DMA_ENGINE
select DMA_VIRTUAL_CHANNELS
+config DMA_BCM2835
+ tristate "BCM2835 DMA engine support"
+ depends on (ARCH_BCM2835 || MACH_BCM2708)
+ select DMA_ENGINE
+ select DMA_VIRTUAL_CHANNELS
+
config TI_CPPI41
tristate "AM33xx CPPI41 DMA support"
depends on ARCH_OMAP
@@ -336,6 +342,14 @@ config K3_DMA
Support the DMA engine for Hisilicon K3 platform
devices.
+config MOXART_DMA
+ tristate "MOXART DMA support"
+ depends on ARCH_MOXART
+ select DMA_ENGINE
+ select DMA_VIRTUAL_CHANNELS
+ help
+ Enable support for the MOXA ART SoC DMA controller.
+
config DMA_ENGINE
bool
drivers/dma/Makefile
View filediff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index 0ce2da9..a029d0f 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -38,7 +38,9 @@ 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-$(CONFIG_DMA_BCM2835) += bcm2835-dma.o
obj-$(CONFIG_MMP_PDMA) += mmp_pdma.o
obj-$(CONFIG_DMA_JZ4740) += dma-jz4740.o
obj-$(CONFIG_TI_CPPI41) += cppi41.o
obj-$(CONFIG_K3_DMA) += k3dma.o
+obj-$(CONFIG_MOXART_DMA) += moxart-dma.o
drivers/dma/acpi-dma.c
View filediff --git a/drivers/dma/acpi-dma.c b/drivers/dma/acpi-dma.c
index e69b03c..1e506af 100644
--- a/drivers/dma/acpi-dma.c
+++ b/drivers/dma/acpi-dma.c
@@ -30,11 +30,12 @@ static DEFINE_MUTEX(acpi_dma_lock);
* @adev: ACPI device to match with
* @adma: struct acpi_dma of the given DMA controller
*
- * Returns 1 on success, 0 when no information is available, or appropriate
- * errno value on error.
- *
* In order to match a device from DSDT table to the corresponding CSRT device
* we use MMIO address and IRQ.
+ *
+ * Return:
+ * 1 on success, 0 when no information is available, or appropriate errno value
+ * on error.
*/
static int acpi_dma_parse_resource_group(const struct acpi_csrt_group *grp,
struct acpi_device *adev, struct acpi_dma *adma)
@@ -101,7 +102,6 @@ static int acpi_dma_parse_resource_group(const struct acpi_csrt_group *grp,
*
* We are using this table to get the request line range of the specific DMA
* controller to be used later.
- *
*/
static void acpi_dma_parse_csrt(struct acpi_device *adev, struct acpi_dma *adma)
{
@@ -141,10 +141,11 @@ static void acpi_dma_parse_csrt(struct acpi_device *adev, struct acpi_dma *adma)
* @data pointer to controller specific data to be used by
* translation function
*
- * Returns 0 on success or appropriate errno value on error.
- *
* Allocated memory should be freed with appropriate acpi_dma_controller_free()
* call.
+ *
+ * Return:
+ * 0 on success or appropriate errno value on error.
*/
int acpi_dma_controller_register(struct device *dev,
struct dma_chan *(*acpi_dma_xlate)
@@ -188,6 +189,9 @@ EXPORT_SYMBOL_GPL(acpi_dma_controller_register);
* @dev: struct device of DMA controller
*
* Memory allocated by acpi_dma_controller_register() is freed here.
+ *
+ * Return:
+ * 0 on success or appropriate errno value on error.
*/
int acpi_dma_controller_free(struct device *dev)
{
@@ -225,6 +229,9 @@ static void devm_acpi_dma_release(struct device *dev, void *res)
* Managed acpi_dma_controller_register(). DMA controller registered by this
* function are automatically freed on driver detach. See
* acpi_dma_controller_register() for more information.
+ *
+ * Return:
+ * 0 on success or appropriate errno value on error.
*/
int devm_acpi_dma_controller_register(struct device *dev,
struct dma_chan *(*acpi_dma_xlate)
@@ -267,8 +274,6 @@ EXPORT_SYMBOL_GPL(devm_acpi_dma_controller_free);
* @adma: struct acpi_dma of DMA controller
* @dma_spec: dma specifier to update
*
- * Returns 0, if no information is avaiable, -1 on mismatch, and 1 otherwise.
- *
* Accordingly to ACPI 5.0 Specification Table 6-170 "Fixed DMA Resource
* Descriptor":
* DMA Request Line bits is a platform-relative number uniquely
@@ -276,6 +281,9 @@ EXPORT_SYMBOL_GPL(devm_acpi_dma_controller_free);
* mapping is done in a controller-specific OS driver.
* That's why we can safely adjust slave_id when the appropriate controller is
* found.
+ *
+ * Return:
+ * 0, if no information is avaiable, -1 on mismatch, and 1 otherwise.
*/
static int acpi_dma_update_dma_spec(struct acpi_dma *adma,
struct acpi_dma_spec *dma_spec)
@@ -334,7 +342,8 @@ static int acpi_dma_parse_fixed_dma(struct acpi_resource *res, void *data)
* @dev: struct device to get DMA request from
* @index: index of FixedDMA descriptor for @dev
*
- * Returns pointer to appropriate dma channel on success or NULL on error.
+ * Return:
+ * Pointer to appropriate dma channel on success or NULL on error.
*/
struct dma_chan *acpi_dma_request_slave_chan_by_index(struct device *dev,
size_t index)
@@ -403,7 +412,8 @@ EXPORT_SYMBOL_GPL(acpi_dma_request_slave_chan_by_index);
* translate the names "tx" and "rx" here based on the most common case where
* the first FixedDMA descriptor is TX and second is RX.
*
- * Returns pointer to appropriate dma channel on success or NULL on error.
+ * Return:
+ * Pointer to appropriate dma channel on success or NULL on error.
*/
struct dma_chan *acpi_dma_request_slave_chan_by_name(struct device *dev,
const char *name)
@@ -427,8 +437,10 @@ EXPORT_SYMBOL_GPL(acpi_dma_request_slave_chan_by_name);
* @adma: pointer to ACPI DMA controller data
*
* A simple translation function for ACPI based devices. Passes &struct
- * dma_spec to the DMA controller driver provided filter function. Returns
- * pointer to the channel if found or %NULL otherwise.
+ * dma_spec to the DMA controller driver provided filter function.
+ *
+ * Return:
+ * Pointer to the channel if found or %NULL otherwise.
*/
struct dma_chan *acpi_dma_simple_xlate(struct acpi_dma_spec *dma_spec,
struct acpi_dma *adma)
drivers/dma/amba-pl08x.c
View filediff --git a/drivers/dma/amba-pl08x.c b/drivers/dma/amba-pl08x.c
index ec4ee5c..8114731 100644
--- a/drivers/dma/amba-pl08x.c
+++ b/drivers/dma/amba-pl08x.c
@@ -83,6 +83,7 @@
#include <linux/dmaengine.h>
#include <linux/dmapool.h>
#include <linux/dma-mapping.h>
+#include <linux/export.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/module.h>
@@ -1771,6 +1772,7 @@ bool pl08x_filter_id(struct dma_chan *chan, void *chan_id)
return false;
}
+EXPORT_SYMBOL_GPL(pl08x_filter_id);
/*
* Just check that the device is there and active
@@ -2167,7 +2169,7 @@ static int pl08x_probe(struct amba_device *adev, const struct amba_id *id)
/* Register slave channels */
ret = pl08x_dma_init_virtual_channels(pl08x, &pl08x->slave,
pl08x->pd->num_slave_channels, true);
- if (ret <= 0) {
+ if (ret < 0) {
dev_warn(&pl08x->adev->dev,
"%s failed to enumerate slave channels - %d\n",
__func__, ret);
drivers/dma/bcm2835-dma.c
View filediff --git a/drivers/dma/bcm2835-dma.c b/drivers/dma/bcm2835-dma.c
new file mode 100644
index 0000000..a036021
--- /dev/null
+++ b/drivers/dma/bcm2835-dma.c
@@ -0,0 +1,707 @@
+/*
+ * BCM2835 DMA engine support
+ *
+ * This driver only supports cyclic DMA transfers
+ * as needed for the I2S module.
+ *
+ * Author: Florian Meier <[email protected]>
+ * Copyright 2013
+ *
+ * Based on
+ * OMAP DMAengine support by Russell King
+ *
+ * BCM2708 DMA Driver
+ * Copyright (C) 2010 Broadcom
+ *
+ * Raspberry Pi PCM I2S ALSA Driver
+ * Copyright (c) by Phil Poole 2013
+ *
+ * MARVELL MMP Peripheral DMA Driver
+ * Copyright 2012 Marvell International Ltd.
+ *
+ * This program 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <linux/err.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/io.h>
+#include <linux/spinlock.h>
+#include <linux/of.h>
+#include <linux/of_dma.h>
+
+#include "virt-dma.h"
+
+struct bcm2835_dmadev {
+ struct dma_device ddev;
+ spinlock_t lock;
+ void __iomem *base;
+ struct device_dma_parameters dma_parms;
+};
+
+struct bcm2835_dma_cb {
+ uint32_t info;
+ uint32_t src;
+ uint32_t dst;
+ uint32_t length;
+ uint32_t stride;
+ uint32_t next;
+ uint32_t pad[2];
+};
+
+struct bcm2835_chan {
+ struct virt_dma_chan vc;
+ struct list_head node;
+
+ struct dma_slave_config cfg;
+ bool cyclic;
+ unsigned int dreq;
+
+ int ch;
+ struct bcm2835_desc *desc;
+
+ void __iomem *chan_base;
+ int irq_number;
+};
+
+struct bcm2835_desc {
+ struct virt_dma_desc vd;
+ enum dma_transfer_direction dir;
+
+ unsigned int control_block_size;
+ struct bcm2835_dma_cb *control_block_base;
+ dma_addr_t control_block_base_phys;
+
+ unsigned int frames;
+ size_t size;
+};
+
+#define BCM2835_DMA_CS 0x00
+#define BCM2835_DMA_ADDR 0x04
+#define BCM2835_DMA_SOURCE_AD 0x0c
+#define BCM2835_DMA_DEST_AD 0x10
+#define BCM2835_DMA_NEXTCB 0x1C
+
+/* DMA CS Control and Status bits */
+#define BCM2835_DMA_ACTIVE BIT(0)
+#define BCM2835_DMA_INT BIT(2)
+#define BCM2835_DMA_ISPAUSED BIT(4) /* Pause requested or not active */
+#define BCM2835_DMA_ISHELD BIT(5) /* Is held by DREQ flow control */
+#define BCM2835_DMA_ERR BIT(8)
+#define BCM2835_DMA_ABORT BIT(30) /* Stop current CB, go to next, WO */
+#define BCM2835_DMA_RESET BIT(31) /* WO, self clearing */
+
+#define BCM2835_DMA_INT_EN BIT(0)
+#define BCM2835_DMA_D_INC BIT(4)
+#define BCM2835_DMA_D_DREQ BIT(6)
+#define BCM2835_DMA_S_INC BIT(8)
+#define BCM2835_DMA_S_DREQ BIT(10)
+
+#define BCM2835_DMA_PER_MAP(x) ((x) << 16)
+
+#define BCM2835_DMA_DATA_TYPE_S8 1
+#define BCM2835_DMA_DATA_TYPE_S16 2
+#define BCM2835_DMA_DATA_TYPE_S32 4
+#define BCM2835_DMA_DATA_TYPE_S128 16
+
+#define BCM2835_DMA_BULK_MASK BIT(0)
+#define BCM2835_DMA_FIQ_MASK (BIT(2) | BIT(3))
+
+/* Valid only for channels 0 - 14, 15 has its own base address */
+#define BCM2835_DMA_CHAN(n) ((n) << 8) /* Base address */
+#define BCM2835_DMA_CHANIO(base, n) ((base) + BCM2835_DMA_CHAN(n))
+
+static inline struct bcm2835_dmadev *to_bcm2835_dma_dev(struct dma_device *d)
+{
+ return container_of(d, struct bcm2835_dmadev, ddev);
+}
+
+static inline struct bcm2835_chan *to_bcm2835_dma_chan(struct dma_chan *c)
+{
+ return container_of(c, struct bcm2835_chan, vc.chan);
+}
+
+static inline struct bcm2835_desc *to_bcm2835_dma_desc(
+ struct dma_async_tx_descriptor *t)
+{
+ return container_of(t, struct bcm2835_desc, vd.tx);
+}
+
+static void bcm2835_dma_desc_free(struct virt_dma_desc *vd)
+{
+ struct bcm2835_desc *desc = container_of(vd, struct bcm2835_desc, vd);
+ dma_free_coherent(desc->vd.tx.chan->device->dev,
+ desc->control_block_size,
+ desc->control_block_base,
+ desc->control_block_base_phys);
+ kfree(desc);
+}
+
+static int bcm2835_dma_abort(void __iomem *chan_base)
+{
+ unsigned long cs;
+ long int timeout = 10000;
+
+ cs = readl(chan_base + BCM2835_DMA_CS);
+ if (!(cs & BCM2835_DMA_ACTIVE))
+ return 0;
+
+ /* Write 0 to the active bit - Pause the DMA */
+ writel(0, chan_base + BCM2835_DMA_CS);
+
+ /* Wait for any current AXI transfer to complete */
+ while ((cs & BCM2835_DMA_ISPAUSED) && --timeout) {
+ cpu_relax();
+ cs = readl(chan_base + BCM2835_DMA_CS);
+ }
+
+ /* We'll un-pause when we set of our next DMA */
+ if (!timeout)
+ return -ETIMEDOUT;
+
+ if (!(cs & BCM2835_DMA_ACTIVE))
+ return 0;
+
+ /* Terminate the control block chain */
+ writel(0, chan_base + BCM2835_DMA_NEXTCB);
+
+ /* Abort the whole DMA */
+ writel(BCM2835_DMA_ABORT | BCM2835_DMA_ACTIVE,
+ chan_base + BCM2835_DMA_CS);
+
+ return 0;
+}
+
+static void bcm2835_dma_start_desc(struct bcm2835_chan *c)
+{
+ struct virt_dma_desc *vd = vchan_next_desc(&c->vc);
+ struct bcm2835_desc *d;
+
+ if (!vd) {
+ c->desc = NULL;
+ return;
+ }
+
+ list_del(&vd->node);
+
+ c->desc = d = to_bcm2835_dma_desc(&vd->tx);
+
+ writel(d->control_block_base_phys, c->chan_base + BCM2835_DMA_ADDR);
+ writel(BCM2835_DMA_ACTIVE, c->chan_base + BCM2835_DMA_CS);
+}
+
+static irqreturn_t bcm2835_dma_callback(int irq, void *data)
+{
+ struct bcm2835_chan *c = data;
+ struct bcm2835_desc *d;
+ unsigned long flags;
+
+ spin_lock_irqsave(&c->vc.lock, flags);
+
+ /* Acknowledge interrupt */
+ writel(BCM2835_DMA_INT, c->chan_base + BCM2835_DMA_CS);
+
+ d = c->desc;
+
+ if (d) {
+ /* TODO Only works for cyclic DMA */
+ vchan_cyclic_callback(&d->vd);
+ }
+
+ /* Keep the DMA engine running */
+ writel(BCM2835_DMA_ACTIVE, c->chan_base + BCM2835_DMA_CS);
+
+ spin_unlock_irqrestore(&c->vc.lock, flags);
+
+ return IRQ_HANDLED;
+}
+
+static int bcm2835_dma_alloc_chan_resources(struct dma_chan *chan)
+{
+ struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
+
+ dev_dbg(c->vc.chan.device->dev,
+ "Allocating DMA channel %d\n", c->ch);
+
+ return request_irq(c->irq_number,
+ bcm2835_dma_callback, 0, "DMA IRQ", c);
+}
+
+static void bcm2835_dma_free_chan_resources(struct dma_chan *chan)
+{
+ struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
+
+ vchan_free_chan_resources(&c->vc);
+ free_irq(c->irq_number, c);
+
+ dev_dbg(c->vc.chan.device->dev, "Freeing DMA channel %u\n", c->ch);
+}
+
+static size_t bcm2835_dma_desc_size(struct bcm2835_desc *d)
+{
+ return d->size;
+}
+
+static size_t bcm2835_dma_desc_size_pos(struct bcm2835_desc *d, dma_addr_t addr)
+{
+ unsigned int i;
+ size_t size;
+
+ for (size = i = 0; i < d->frames; i++) {
+ struct bcm2835_dma_cb *control_block =
+ &d->control_block_base[i];
+ size_t this_size = control_block->length;
+ dma_addr_t dma;
+
+ if (d->dir == DMA_DEV_TO_MEM)
+ dma = control_block->dst;
+ else
+ dma = control_block->src;
+
+ if (size)
+ size += this_size;
+ else if (addr >= dma && addr < dma + this_size)
+ size += dma + this_size - addr;
+ }
+
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drivers/dma/cppi41.c
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drivers/dma/dmatest.c
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drivers/dma/dw/core.c
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drivers/dma/edma.c
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drivers/dma/fsldma.h
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drivers/dma/imx-sdma.c
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drivers/dma/k3dma.c
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drivers/dma/mmp_pdma.c
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drivers/dma/mmp_tdma.c
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drivers/dma/moxart-dma.c
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drivers/dma/omap-dma.c
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drivers/dma/pl330.c
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drivers/dma/ppc4xx/adma.c
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drivers/dma/sirf-dma.c
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drivers/dma/tegra20-apb-dma.c
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drivers/dma/virt-dma.h
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include/linux/dmaengine.h
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include/linux/platform_data/dma-imx-sdma.h
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include/linux/platform_data/dma-imx.h
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include/linux/platform_data/dma-mmp_tdma.h
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include/linux/platform_data/dma-mv_xor.h
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sound/soc/fsl/fsl_ssi.c
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