--- /dev/null
+* 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";
+};
19 IPU Memory
20 ASRC
21 ESAI
+ 22 SSI Dual FIFO (needs firmware ver >= 2)
The third cell specifies the transfer priority as below.
--- /dev/null
+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";
+ };
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
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
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
* @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)
*
* 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)
{
* @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)
* @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)
{
* 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)
* @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
* 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)
* @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)
* 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)
* @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)
#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>
return false;
}
+EXPORT_SYMBOL_GPL(pl08x_filter_id);
/*
* Just check that the device is there and active
/* 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);
--- /dev/null
+/*
+ * BCM2835 DMA engine support
+ *
+ * This driver only supports cyclic DMA transfers
+ * as needed for the I2S module.
+ *
+ * Author: Florian Meier <florian.meier@koalo.de>
+ * 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;
+ }
+
+ return size;
+}
+
+static enum dma_status bcm2835_dma_tx_status(struct dma_chan *chan,
+ dma_cookie_t cookie, struct dma_tx_state *txstate)
+{
+ struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
+ struct virt_dma_desc *vd;
+ enum dma_status ret;
+ unsigned long flags;
+
+ ret = dma_cookie_status(chan, cookie, txstate);
+ if (ret == DMA_COMPLETE || !txstate)
+ return ret;
+
+ spin_lock_irqsave(&c->vc.lock, flags);
+ vd = vchan_find_desc(&c->vc, cookie);
+ if (vd) {
+ txstate->residue =
+ bcm2835_dma_desc_size(to_bcm2835_dma_desc(&vd->tx));
+ } else if (c->desc && c->desc->vd.tx.cookie == cookie) {
+ struct bcm2835_desc *d = c->desc;
+ dma_addr_t pos;
+
+ if (d->dir == DMA_MEM_TO_DEV)
+ pos = readl(c->chan_base + BCM2835_DMA_SOURCE_AD);
+ else if (d->dir == DMA_DEV_TO_MEM)
+ pos = readl(c->chan_base + BCM2835_DMA_DEST_AD);
+ else
+ pos = 0;
+
+ txstate->residue = bcm2835_dma_desc_size_pos(d, pos);
+ } else {
+ txstate->residue = 0;
+ }
+
+ spin_unlock_irqrestore(&c->vc.lock, flags);
+
+ return ret;
+}
+
+static void bcm2835_dma_issue_pending(struct dma_chan *chan)
+{
+ struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
+ unsigned long flags;
+
+ c->cyclic = true; /* Nothing else is implemented */
+
+ spin_lock_irqsave(&c->vc.lock, flags);
+ if (vchan_issue_pending(&c->vc) && !c->desc)
+ bcm2835_dma_start_desc(c);
+
+ spin_unlock_irqrestore(&c->vc.lock, flags);
+}
+
+static struct dma_async_tx_descriptor *bcm2835_dma_prep_dma_cyclic(
+ struct dma_chan *chan, dma_addr_t buf_addr, size_t buf_len,
+ size_t period_len, enum dma_transfer_direction direction,
+ unsigned long flags, void *context)
+{
+ struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
+ enum dma_slave_buswidth dev_width;
+ struct bcm2835_desc *d;
+ dma_addr_t dev_addr;
+ unsigned int es, sync_type;
+ unsigned int frame;
+
+ /* Grab configuration */
+ if (!is_slave_direction(direction)) {
+ dev_err(chan->device->dev, "%s: bad direction?\n", __func__);
+ return NULL;
+ }
+
+ if (direction == DMA_DEV_TO_MEM) {
+ dev_addr = c->cfg.src_addr;
+ dev_width = c->cfg.src_addr_width;
+ sync_type = BCM2835_DMA_S_DREQ;
+ } else {
+ dev_addr = c->cfg.dst_addr;
+ dev_width = c->cfg.dst_addr_width;
+ sync_type = BCM2835_DMA_D_DREQ;
+ }
+
+ /* Bus width translates to the element size (ES) */
+ switch (dev_width) {
+ case DMA_SLAVE_BUSWIDTH_4_BYTES:
+ es = BCM2835_DMA_DATA_TYPE_S32;
+ break;
+ default:
+ return NULL;
+ }
+
+ /* Now allocate and setup the descriptor. */
+ d = kzalloc(sizeof(*d), GFP_NOWAIT);
+ if (!d)
+ return NULL;
+
+ d->dir = direction;
+ d->frames = buf_len / period_len;
+
+ /* Allocate memory for control blocks */
+ d->control_block_size = d->frames * sizeof(struct bcm2835_dma_cb);
+ d->control_block_base = dma_zalloc_coherent(chan->device->dev,
+ d->control_block_size, &d->control_block_base_phys,
+ GFP_NOWAIT);
+
+ if (!d->control_block_base) {
+ kfree(d);
+ return NULL;
+ }
+
+ /*
+ * Iterate over all frames, create a control block
+ * for each frame and link them together.
+ */
+ for (frame = 0; frame < d->frames; frame++) {
+ struct bcm2835_dma_cb *control_block =
+ &d->control_block_base[frame];
+
+ /* Setup adresses */
+ if (d->dir == DMA_DEV_TO_MEM) {
+ control_block->info = BCM2835_DMA_D_INC;
+ control_block->src = dev_addr;
+ control_block->dst = buf_addr + frame * period_len;
+ } else {
+ control_block->info = BCM2835_DMA_S_INC;
+ control_block->src = buf_addr + frame * period_len;
+ control_block->dst = dev_addr;
+ }
+
+ /* Enable interrupt */
+ control_block->info |= BCM2835_DMA_INT_EN;
+
+ /* Setup synchronization */
+ if (sync_type != 0)
+ control_block->info |= sync_type;
+
+ /* Setup DREQ channel */
+ if (c->dreq != 0)
+ control_block->info |=
+ BCM2835_DMA_PER_MAP(c->dreq);
+
+ /* Length of a frame */
+ control_block->length = period_len;
+ d->size += control_block->length;
+
+ /*
+ * Next block is the next frame.
+ * This DMA engine driver currently only supports cyclic DMA.
+ * Therefore, wrap around at number of frames.
+ */
+ control_block->next = d->control_block_base_phys +
+ sizeof(struct bcm2835_dma_cb)
+ * ((frame + 1) % d->frames);
+ }
+
+ return vchan_tx_prep(&c->vc, &d->vd, flags);
+}
+
+static int bcm2835_dma_slave_config(struct bcm2835_chan *c,
+ struct dma_slave_config *cfg)
+{
+ if ((cfg->direction == DMA_DEV_TO_MEM &&
+ cfg->src_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES) ||
+ (cfg->direction == DMA_MEM_TO_DEV &&
+ cfg->dst_addr_width != DMA_SLAVE_BUSWIDTH_4_BYTES) ||
+ !is_slave_direction(cfg->direction)) {
+ return -EINVAL;
+ }
+
+ c->cfg = *cfg;
+
+ return 0;
+}
+
+static int bcm2835_dma_terminate_all(struct bcm2835_chan *c)
+{
+ struct bcm2835_dmadev *d = to_bcm2835_dma_dev(c->vc.chan.device);
+ unsigned long flags;
+ int timeout = 10000;
+ LIST_HEAD(head);
+
+ spin_lock_irqsave(&c->vc.lock, flags);
+
+ /* Prevent this channel being scheduled */
+ spin_lock(&d->lock);
+ list_del_init(&c->node);
+ spin_unlock(&d->lock);
+
+ /*
+ * Stop DMA activity: we assume the callback will not be called
+ * after bcm_dma_abort() returns (even if it does, it will see
+ * c->desc is NULL and exit.)
+ */
+ if (c->desc) {
+ c->desc = NULL;
+ bcm2835_dma_abort(c->chan_base);
+
+ /* Wait for stopping */
+ while (--timeout) {
+ if (!(readl(c->chan_base + BCM2835_DMA_CS) &
+ BCM2835_DMA_ACTIVE))
+ break;
+
+ cpu_relax();
+ }
+
+ if (!timeout)
+ dev_err(d->ddev.dev, "DMA transfer could not be terminated\n");
+ }
+
+ vchan_get_all_descriptors(&c->vc, &head);
+ spin_unlock_irqrestore(&c->vc.lock, flags);
+ vchan_dma_desc_free_list(&c->vc, &head);
+
+ return 0;
+}
+
+static int bcm2835_dma_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
+ unsigned long arg)
+{
+ struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
+
+ switch (cmd) {
+ case DMA_SLAVE_CONFIG:
+ return bcm2835_dma_slave_config(c,
+ (struct dma_slave_config *)arg);
+
+ case DMA_TERMINATE_ALL:
+ return bcm2835_dma_terminate_all(c);
+
+ default:
+ return -ENXIO;
+ }
+}
+
+static int bcm2835_dma_chan_init(struct bcm2835_dmadev *d, int chan_id, int irq)
+{
+ struct bcm2835_chan *c;
+
+ c = devm_kzalloc(d->ddev.dev, sizeof(*c), GFP_KERNEL);
+ if (!c)
+ return -ENOMEM;
+
+ c->vc.desc_free = bcm2835_dma_desc_free;
+ vchan_init(&c->vc, &d->ddev);
+ INIT_LIST_HEAD(&c->node);
+
+ d->ddev.chancnt++;
+
+ c->chan_base = BCM2835_DMA_CHANIO(d->base, chan_id);
+ c->ch = chan_id;
+ c->irq_number = irq;
+
+ return 0;
+}
+
+static void bcm2835_dma_free(struct bcm2835_dmadev *od)
+{
+ struct bcm2835_chan *c, *next;
+
+ list_for_each_entry_safe(c, next, &od->ddev.channels,
+ vc.chan.device_node) {
+ list_del(&c->vc.chan.device_node);
+ tasklet_kill(&c->vc.task);
+ }
+}
+
+static const struct of_device_id bcm2835_dma_of_match[] = {
+ { .compatible = "brcm,bcm2835-dma", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, bcm2835_dma_of_match);
+
+static struct dma_chan *bcm2835_dma_xlate(struct of_phandle_args *spec,
+ struct of_dma *ofdma)
+{
+ struct bcm2835_dmadev *d = ofdma->of_dma_data;
+ struct dma_chan *chan;
+
+ chan = dma_get_any_slave_channel(&d->ddev);
+ if (!chan)
+ return NULL;
+
+ /* Set DREQ from param */
+ to_bcm2835_dma_chan(chan)->dreq = spec->args[0];
+
+ return chan;
+}
+
+static int bcm2835_dma_device_slave_caps(struct dma_chan *dchan,
+ struct dma_slave_caps *caps)
+{
+ caps->src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
+ caps->dstn_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
+ caps->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
+ caps->cmd_pause = false;
+ caps->cmd_terminate = true;
+
+ return 0;
+}
+
+static int bcm2835_dma_probe(struct platform_device *pdev)
+{
+ struct bcm2835_dmadev *od;
+ struct resource *res;
+ void __iomem *base;
+ int rc;
+ int i;
+ int irq;
+ uint32_t chans_available;
+
+ if (!pdev->dev.dma_mask)
+ pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
+
+ rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
+ if (rc)
+ return rc;
+
+ od = devm_kzalloc(&pdev->dev, sizeof(*od), GFP_KERNEL);
+ if (!od)
+ return -ENOMEM;
+
+ pdev->dev.dma_parms = &od->dma_parms;
+ dma_set_max_seg_size(&pdev->dev, 0x3FFFFFFF);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+ od->base = base;
+
+ dma_cap_set(DMA_SLAVE, od->ddev.cap_mask);
+ dma_cap_set(DMA_PRIVATE, od->ddev.cap_mask);
+ dma_cap_set(DMA_CYCLIC, od->ddev.cap_mask);
+ od->ddev.device_alloc_chan_resources = bcm2835_dma_alloc_chan_resources;
+ od->ddev.device_free_chan_resources = bcm2835_dma_free_chan_resources;
+ od->ddev.device_tx_status = bcm2835_dma_tx_status;
+ od->ddev.device_issue_pending = bcm2835_dma_issue_pending;
+ od->ddev.device_slave_caps = bcm2835_dma_device_slave_caps;
+ od->ddev.device_prep_dma_cyclic = bcm2835_dma_prep_dma_cyclic;
+ od->ddev.device_control = bcm2835_dma_control;
+ od->ddev.dev = &pdev->dev;
+ INIT_LIST_HEAD(&od->ddev.channels);
+ spin_lock_init(&od->lock);
+
+ platform_set_drvdata(pdev, od);
+
+ /* Request DMA channel mask from device tree */
+ if (of_property_read_u32(pdev->dev.of_node,
+ "brcm,dma-channel-mask",
+ &chans_available)) {
+ dev_err(&pdev->dev, "Failed to get channel mask\n");
+ rc = -EINVAL;
+ goto err_no_dma;
+ }
+
+ /*
+ * Do not use the FIQ and BULK channels,
+ * because they are used by the GPU.
+ */
+ chans_available &= ~(BCM2835_DMA_FIQ_MASK | BCM2835_DMA_BULK_MASK);
+
+ for (i = 0; i < pdev->num_resources; i++) {
+ irq = platform_get_irq(pdev, i);
+ if (irq < 0)
+ break;
+
+ if (chans_available & (1 << i)) {
+ rc = bcm2835_dma_chan_init(od, i, irq);
+ if (rc)
+ goto err_no_dma;
+ }
+ }
+
+ dev_dbg(&pdev->dev, "Initialized %i DMA channels\n", i);
+
+ /* Device-tree DMA controller registration */
+ rc = of_dma_controller_register(pdev->dev.of_node,
+ bcm2835_dma_xlate, od);
+ if (rc) {
+ dev_err(&pdev->dev, "Failed to register DMA controller\n");
+ goto err_no_dma;
+ }
+
+ rc = dma_async_device_register(&od->ddev);
+ if (rc) {
+ dev_err(&pdev->dev,
+ "Failed to register slave DMA engine device: %d\n", rc);
+ goto err_no_dma;
+ }
+
+ dev_dbg(&pdev->dev, "Load BCM2835 DMA engine driver\n");
+
+ return 0;
+
+err_no_dma:
+ bcm2835_dma_free(od);
+ return rc;
+}
+
+static int bcm2835_dma_remove(struct platform_device *pdev)
+{
+ struct bcm2835_dmadev *od = platform_get_drvdata(pdev);
+
+ dma_async_device_unregister(&od->ddev);
+ bcm2835_dma_free(od);
+
+ return 0;
+}
+
+static struct platform_driver bcm2835_dma_driver = {
+ .probe = bcm2835_dma_probe,
+ .remove = bcm2835_dma_remove,
+ .driver = {
+ .name = "bcm2835-dma",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(bcm2835_dma_of_match),
+ },
+};
+
+module_platform_driver(bcm2835_dma_driver);
+
+MODULE_ALIAS("platform:bcm2835-dma");
+MODULE_DESCRIPTION("BCM2835 DMA engine driver");
+MODULE_AUTHOR("Florian Meier <florian.meier@koalo.de>");
+MODULE_LICENSE("GPL v2");
goto err_chans;
irq = irq_of_parse_and_map(dev->of_node, 0);
- if (!irq)
+ if (!irq) {
+ ret = -EINVAL;
goto err_irq;
+ }
cppi_writel(USBSS_IRQ_PD_COMP, cdd->usbss_mem + USBSS_IRQ_ENABLER);
S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(channel, "Bus ID of the channel to test (default: any)");
-static char test_device[20];
+static char test_device[32];
module_param_string(device, test_device, sizeof(test_device),
S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(device, "Bus ID of the DMA Engine to test (default: any)");
struct dmatest_params {
unsigned int buf_size;
char channel[20];
- char device[20];
+ char device[32];
unsigned int threads_per_chan;
unsigned int max_channels;
unsigned int iterations;
struct dw_dma *dw = to_dw_dma(dwc->chan.device);
u32 ctllo;
- /* Software emulation of LLP mode relies on interrupts to continue
- * multi block transfer. */
+ /*
+ * Software emulation of LLP mode relies on interrupts to continue
+ * multi block transfer.
+ */
ctllo = desc->lli.ctllo | DWC_CTLL_INT_EN;
channel_writel(dwc, SAR, desc->lli.sar);
&dwc->flags);
if (was_soft_llp) {
dev_err(chan2dev(&dwc->chan),
- "BUG: Attempted to start new LLP transfer "
- "inside ongoing one\n");
+ "BUG: Attempted to start new LLP transfer inside ongoing one\n");
return;
}
return;
}
- dev_vdbg(chan2dev(&dwc->chan), "%s: llp=0x%llx\n", __func__,
- (unsigned long long)llp);
+ dev_vdbg(chan2dev(&dwc->chan), "%s: llp=%pad\n", __func__, &llp);
list_for_each_entry_safe(desc, _desc, &dwc->active_list, desc_node) {
/* Initial residue value */
unlikely(status_xfer & dwc->mask)) {
int i;
- dev_err(chan2dev(&dwc->chan), "cyclic DMA unexpected %s "
- "interrupt, stopping DMA transfer\n",
- status_xfer ? "xfer" : "error");
+ dev_err(chan2dev(&dwc->chan),
+ "cyclic DMA unexpected %s interrupt, stopping DMA transfer\n",
+ status_xfer ? "xfer" : "error");
spin_lock_irqsave(&dwc->lock, flags);
u32 ctllo;
dev_vdbg(chan2dev(chan),
- "%s: d0x%llx s0x%llx l0x%zx f0x%lx\n", __func__,
- (unsigned long long)dest, (unsigned long long)src,
- len, flags);
+ "%s: d%pad s%pad l0x%zx f0x%lx\n", __func__,
+ &dest, &src, len, flags);
if (unlikely(!len)) {
dev_dbg(chan2dev(chan), "%s: length is zero!\n", __func__);
/* Let's make a cyclic list */
last->lli.llp = cdesc->desc[0]->txd.phys;
- dev_dbg(chan2dev(&dwc->chan), "cyclic prepared buf 0x%llx len %zu "
- "period %zu periods %d\n", (unsigned long long)buf_addr,
- buf_len, period_len, periods);
+ dev_dbg(chan2dev(&dwc->chan),
+ "cyclic prepared buf %pad len %zu period %zu periods %d\n",
+ &buf_addr, buf_len, period_len, periods);
cdesc->periods = periods;
dwc->cdesc = cdesc;
dev_dbg(chip->dev, "DWC_PARAMS[%d]: 0x%08x\n", i,
dwc_params);
- /* Decode maximum block size for given channel. The
+ /*
+ * Decode maximum block size for given channel. The
* stored 4 bit value represents blocks from 0x00 for 3
- * up to 0x0a for 4095. */
+ * up to 0x0a for 4095.
+ */
dwc->block_size =
(4 << ((max_blk_size >> 4 * i) & 0xf)) - 1;
dwc->nollp =
echan->alloced = true;
echan->slot[0] = echan->ch_num;
- dev_info(dev, "allocated channel for %u:%u\n",
- EDMA_CTLR(echan->ch_num), EDMA_CHAN_SLOT(echan->ch_num));
+ dev_dbg(dev, "allocated channel for %u:%u\n",
+ EDMA_CTLR(echan->ch_num), EDMA_CHAN_SLOT(echan->ch_num));
return 0;
echan->alloced = false;
}
- dev_info(dev, "freeing channel for %u\n", echan->ch_num);
+ dev_dbg(dev, "freeing channel for %u\n", echan->ch_num);
}
/* Send pending descriptor to hardware */
* channel is allowed to transfer before the DMA engine pauses
* the current channel and switches to the next channel
*/
-#define FSL_DMA_MR_BWC 0x08000000
+#define FSL_DMA_MR_BWC 0x0A000000
/* Special MR definition for MPC8349 */
#define FSL_DMA_MR_EOTIE 0x00000080
struct clk *clk_ipg;
struct clk *clk_ahb;
spinlock_t channel_0_lock;
+ u32 script_number;
struct sdma_script_start_addrs *script_addrs;
const struct sdma_driver_data *drvdata;
};
per_2_emi = sdma->script_addrs->app_2_mcu_addr;
emi_2_per = sdma->script_addrs->mcu_2_app_addr;
break;
+ case IMX_DMATYPE_SSI_DUAL:
+ per_2_emi = sdma->script_addrs->ssish_2_mcu_addr;
+ emi_2_per = sdma->script_addrs->mcu_2_ssish_addr;
+ break;
case IMX_DMATYPE_SSI_SP:
case IMX_DMATYPE_MMC:
case IMX_DMATYPE_SDHC:
}
#define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1 34
+#define SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V2 38
static void sdma_add_scripts(struct sdma_engine *sdma,
const struct sdma_script_start_addrs *addr)
s32 *saddr_arr = (u32 *)sdma->script_addrs;
int i;
- for (i = 0; i < SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1; i++)
+ /* use the default firmware in ROM if missing external firmware */
+ if (!sdma->script_number)
+ sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1;
+
+ for (i = 0; i < sdma->script_number; i++)
if (addr_arr[i] > 0)
saddr_arr[i] = addr_arr[i];
}
goto err_firmware;
if (header->ram_code_start + header->ram_code_size > fw->size)
goto err_firmware;
+ switch (header->version_major) {
+ case 1:
+ sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V1;
+ break;
+ case 2:
+ sdma->script_number = SDMA_SCRIPT_ADDRS_ARRAY_SIZE_V2;
+ break;
+ default:
+ dev_err(sdma->dev, "unknown firmware version\n");
+ goto err_firmware;
+ }
addr = (void *)header + header->script_addrs_start;
ram_code = (void *)header + header->ram_code_start;
dma_addr_t addr, src = 0, dst = 0;
int num = sglen, i;
- if (sgl == 0)
+ if (sgl == NULL)
return NULL;
for_each_sg(sgl, sg, sglen, i) {
return 0;
}
-SIMPLE_DEV_PM_OPS(k3_dma_pmops, k3_dma_suspend, k3_dma_resume);
+static SIMPLE_DEV_PM_OPS(k3_dma_pmops, k3_dma_suspend, k3_dma_resume);
static struct platform_driver k3_pdma_driver = {
.driver = {
* 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/module.h>
#include <linux/init.h>
#define DTADR 0x0208
#define DCMD 0x020c
-#define DCSR_RUN (1 << 31) /* Run Bit (read / write) */
-#define DCSR_NODESC (1 << 30) /* No-Descriptor Fetch (read / write) */
-#define DCSR_STOPIRQEN (1 << 29) /* Stop Interrupt Enable (read / write) */
-#define DCSR_REQPEND (1 << 8) /* Request Pending (read-only) */
-#define DCSR_STOPSTATE (1 << 3) /* Stop State (read-only) */
-#define DCSR_ENDINTR (1 << 2) /* End Interrupt (read / write) */
-#define DCSR_STARTINTR (1 << 1) /* Start Interrupt (read / write) */
-#define DCSR_BUSERR (1 << 0) /* Bus Error Interrupt (read / write) */
-
-#define DCSR_EORIRQEN (1 << 28) /* End of Receive Interrupt Enable (R/W) */
-#define DCSR_EORJMPEN (1 << 27) /* Jump to next descriptor on EOR */
-#define DCSR_EORSTOPEN (1 << 26) /* STOP on an EOR */
-#define DCSR_SETCMPST (1 << 25) /* Set Descriptor Compare Status */
-#define DCSR_CLRCMPST (1 << 24) /* Clear Descriptor Compare Status */
-#define DCSR_CMPST (1 << 10) /* The Descriptor Compare Status */
-#define DCSR_EORINTR (1 << 9) /* The end of Receive */
-
-#define DRCMR(n) ((((n) < 64) ? 0x0100 : 0x1100) + \
- (((n) & 0x3f) << 2))
-#define DRCMR_MAPVLD (1 << 7) /* Map Valid (read / write) */
-#define DRCMR_CHLNUM 0x1f /* mask for Channel Number (read / write) */
+#define DCSR_RUN BIT(31) /* Run Bit (read / write) */
+#define DCSR_NODESC BIT(30) /* No-Descriptor Fetch (read / write) */
+#define DCSR_STOPIRQEN BIT(29) /* Stop Interrupt Enable (read / write) */
+#define DCSR_REQPEND BIT(8) /* Request Pending (read-only) */
+#define DCSR_STOPSTATE BIT(3) /* Stop State (read-only) */
+#define DCSR_ENDINTR BIT(2) /* End Interrupt (read / write) */
+#define DCSR_STARTINTR BIT(1) /* Start Interrupt (read / write) */
+#define DCSR_BUSERR BIT(0) /* Bus Error Interrupt (read / write) */
+
+#define DCSR_EORIRQEN BIT(28) /* End of Receive Interrupt Enable (R/W) */
+#define DCSR_EORJMPEN BIT(27) /* Jump to next descriptor on EOR */
+#define DCSR_EORSTOPEN BIT(26) /* STOP on an EOR */
+#define DCSR_SETCMPST BIT(25) /* Set Descriptor Compare Status */
+#define DCSR_CLRCMPST BIT(24) /* Clear Descriptor Compare Status */
+#define DCSR_CMPST BIT(10) /* The Descriptor Compare Status */
+#define DCSR_EORINTR BIT(9) /* The end of Receive */
+
+#define DRCMR(n) ((((n) < 64) ? 0x0100 : 0x1100) + (((n) & 0x3f) << 2))
+#define DRCMR_MAPVLD BIT(7) /* Map Valid (read / write) */
+#define DRCMR_CHLNUM 0x1f /* mask for Channel Number (read / write) */
#define DDADR_DESCADDR 0xfffffff0 /* Address of next descriptor (mask) */
-#define DDADR_STOP (1 << 0) /* Stop (read / write) */
-
-#define DCMD_INCSRCADDR (1 << 31) /* Source Address Increment Setting. */
-#define DCMD_INCTRGADDR (1 << 30) /* Target Address Increment Setting. */
-#define DCMD_FLOWSRC (1 << 29) /* Flow Control by the source. */
-#define DCMD_FLOWTRG (1 << 28) /* Flow Control by the target. */
-#define DCMD_STARTIRQEN (1 << 22) /* Start Interrupt Enable */
-#define DCMD_ENDIRQEN (1 << 21) /* End Interrupt Enable */
-#define DCMD_ENDIAN (1 << 18) /* Device Endian-ness. */
+#define DDADR_STOP BIT(0) /* Stop (read / write) */
+
+#define DCMD_INCSRCADDR BIT(31) /* Source Address Increment Setting. */
+#define DCMD_INCTRGADDR BIT(30) /* Target Address Increment Setting. */
+#define DCMD_FLOWSRC BIT(29) /* Flow Control by the source. */
+#define DCMD_FLOWTRG BIT(28) /* Flow Control by the target. */
+#define DCMD_STARTIRQEN BIT(22) /* Start Interrupt Enable */
+#define DCMD_ENDIRQEN BIT(21) /* End Interrupt Enable */
+#define DCMD_ENDIAN BIT(18) /* Device Endian-ness. */
#define DCMD_BURST8 (1 << 16) /* 8 byte burst */
#define DCMD_BURST16 (2 << 16) /* 16 byte burst */
#define DCMD_BURST32 (3 << 16) /* 32 byte burst */
spinlock_t phy_lock; /* protect alloc/free phy channels */
};
-#define tx_to_mmp_pdma_desc(tx) container_of(tx, struct mmp_pdma_desc_sw, async_tx)
-#define to_mmp_pdma_desc(lh) container_of(lh, struct mmp_pdma_desc_sw, node)
-#define to_mmp_pdma_chan(dchan) container_of(dchan, struct mmp_pdma_chan, chan)
-#define to_mmp_pdma_dev(dmadev) container_of(dmadev, struct mmp_pdma_device, device)
+#define tx_to_mmp_pdma_desc(tx) \
+ container_of(tx, struct mmp_pdma_desc_sw, async_tx)
+#define to_mmp_pdma_desc(lh) \
+ container_of(lh, struct mmp_pdma_desc_sw, node)
+#define to_mmp_pdma_chan(dchan) \
+ container_of(dchan, struct mmp_pdma_chan, chan)
+#define to_mmp_pdma_dev(dmadev) \
+ container_of(dmadev, struct mmp_pdma_device, device)
static void set_desc(struct mmp_pdma_phy *phy, dma_addr_t addr)
{
writel(dalgn, phy->base + DALGN);
reg = (phy->idx << 2) + DCSR;
- writel(readl(phy->base + reg) | DCSR_RUN,
- phy->base + reg);
+ writel(readl(phy->base + reg) | DCSR_RUN, phy->base + reg);
}
static void disable_chan(struct mmp_pdma_phy *phy)
{
u32 reg;
- if (phy) {
- reg = (phy->idx << 2) + DCSR;
- writel(readl(phy->base + reg) & ~DCSR_RUN,
- phy->base + reg);
- }
+ if (!phy)
+ return;
+
+ reg = (phy->idx << 2) + DCSR;
+ writel(readl(phy->base + reg) & ~DCSR_RUN, phy->base + reg);
}
static int clear_chan_irq(struct mmp_pdma_phy *phy)
u32 dint = readl(phy->base + DINT);
u32 reg = (phy->idx << 2) + DCSR;
- if (dint & BIT(phy->idx)) {
- /* clear irq */
- dcsr = readl(phy->base + reg);
- writel(dcsr, phy->base + reg);
- if ((dcsr & DCSR_BUSERR) && (phy->vchan))
- dev_warn(phy->vchan->dev, "DCSR_BUSERR\n");
- return 0;
- }
- return -EAGAIN;
+ if (!(dint & BIT(phy->idx)))
+ return -EAGAIN;
+
+ /* clear irq */
+ dcsr = readl(phy->base + reg);
+ writel(dcsr, phy->base + reg);
+ if ((dcsr & DCSR_BUSERR) && (phy->vchan))
+ dev_warn(phy->vchan->dev, "DCSR_BUSERR\n");
+
+ return 0;
}
static irqreturn_t mmp_pdma_chan_handler(int irq, void *dev_id)
{
struct mmp_pdma_phy *phy = dev_id;
- if (clear_chan_irq(phy) == 0) {
- tasklet_schedule(&phy->vchan->tasklet);
- return IRQ_HANDLED;
- } else
+ if (clear_chan_irq(phy) != 0)
return IRQ_NONE;
+
+ tasklet_schedule(&phy->vchan->tasklet);
+ return IRQ_HANDLED;
}
static irqreturn_t mmp_pdma_int_handler(int irq, void *dev_id)
if (irq_num)
return IRQ_HANDLED;
- else
- return IRQ_NONE;
+
+ return IRQ_NONE;
}
/* lookup free phy channel as descending priority */
*/
spin_lock_irqsave(&pdev->phy_lock, flags);
- for (prio = 0; prio <= (((pdev->dma_channels - 1) & 0xf) >> 2); prio++) {
+ for (prio = 0; prio <= ((pdev->dma_channels - 1) & 0xf) >> 2; prio++) {
for (i = 0; i < pdev->dma_channels; i++) {
- if (prio != ((i & 0xf) >> 2))
+ if (prio != (i & 0xf) >> 2)
continue;
phy = &pdev->phy[i];
if (!phy->vchan) {
if (chan->desc_pool)
return 1;
- chan->desc_pool =
- dma_pool_create(dev_name(&dchan->dev->device), chan->dev,
- sizeof(struct mmp_pdma_desc_sw),
- __alignof__(struct mmp_pdma_desc_sw), 0);
+ chan->desc_pool = dma_pool_create(dev_name(&dchan->dev->device),
+ chan->dev,
+ sizeof(struct mmp_pdma_desc_sw),
+ __alignof__(struct mmp_pdma_desc_sw),
+ 0);
if (!chan->desc_pool) {
dev_err(chan->dev, "unable to allocate descriptor pool\n");
return -ENOMEM;
}
+
mmp_pdma_free_phy(chan);
chan->idle = true;
chan->dev_addr = 0;
}
static void mmp_pdma_free_desc_list(struct mmp_pdma_chan *chan,
- struct list_head *list)
+ struct list_head *list)
{
struct mmp_pdma_desc_sw *desc, *_desc;
static struct dma_async_tx_descriptor *
mmp_pdma_prep_memcpy(struct dma_chan *dchan,
- dma_addr_t dma_dst, dma_addr_t dma_src,
- size_t len, unsigned long flags)
+ dma_addr_t dma_dst, dma_addr_t dma_src,
+ size_t len, unsigned long flags)
{
struct mmp_pdma_chan *chan;
struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new;
static struct dma_async_tx_descriptor *
mmp_pdma_prep_slave_sg(struct dma_chan *dchan, struct scatterlist *sgl,
- unsigned int sg_len, enum dma_transfer_direction dir,
- unsigned long flags, void *context)
+ unsigned int sg_len, enum dma_transfer_direction dir,
+ unsigned long flags, void *context)
{
struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new = NULL;
return NULL;
}
-static struct dma_async_tx_descriptor *mmp_pdma_prep_dma_cyclic(
- struct dma_chan *dchan, dma_addr_t buf_addr, size_t len,
- size_t period_len, enum dma_transfer_direction direction,
- unsigned long flags, void *context)
+static struct dma_async_tx_descriptor *
+mmp_pdma_prep_dma_cyclic(struct dma_chan *dchan,
+ dma_addr_t buf_addr, size_t len, size_t period_len,
+ enum dma_transfer_direction direction,
+ unsigned long flags, void *context)
{
struct mmp_pdma_chan *chan;
struct mmp_pdma_desc_sw *first = NULL, *prev = NULL, *new;
goto fail;
}
- new->desc.dcmd = chan->dcmd | DCMD_ENDIRQEN |
- (DCMD_LENGTH & period_len);
+ new->desc.dcmd = (chan->dcmd | DCMD_ENDIRQEN |
+ (DCMD_LENGTH & period_len));
new->desc.dsadr = dma_src;
new->desc.dtadr = dma_dst;
}
static int mmp_pdma_control(struct dma_chan *dchan, enum dma_ctrl_cmd cmd,
- unsigned long arg)
+ unsigned long arg)
{
struct mmp_pdma_chan *chan = to_mmp_pdma_chan(dchan);
struct dma_slave_config *cfg = (void *)arg;
unsigned long flags;
- int ret = 0;
u32 maxburst = 0, addr = 0;
enum dma_slave_buswidth width = DMA_SLAVE_BUSWIDTH_UNDEFINED;
return -ENOSYS;
}
- return ret;
+ return 0;
}
static enum dma_status mmp_pdma_tx_status(struct dma_chan *dchan,
- dma_cookie_t cookie, struct dma_tx_state *txstate)
+ dma_cookie_t cookie,
+ struct dma_tx_state *txstate)
{
return dma_cookie_status(dchan, cookie, txstate);
}
return 0;
}
-static int mmp_pdma_chan_init(struct mmp_pdma_device *pdev,
- int idx, int irq)
+static int mmp_pdma_chan_init(struct mmp_pdma_device *pdev, int idx, int irq)
{
struct mmp_pdma_phy *phy = &pdev->phy[idx];
struct mmp_pdma_chan *chan;
int ret;
- chan = devm_kzalloc(pdev->dev,
- sizeof(struct mmp_pdma_chan), GFP_KERNEL);
+ chan = devm_kzalloc(pdev->dev, sizeof(struct mmp_pdma_chan),
+ GFP_KERNEL);
if (chan == NULL)
return -ENOMEM;
phy->base = pdev->base;
if (irq) {
- ret = devm_request_irq(pdev->dev, irq,
- mmp_pdma_chan_handler, 0, "pdma", phy);
+ ret = devm_request_irq(pdev->dev, irq, mmp_pdma_chan_handler, 0,
+ "pdma", phy);
if (ret) {
dev_err(pdev->dev, "channel request irq fail!\n");
return ret;
INIT_LIST_HEAD(&chan->chain_running);
/* register virt channel to dma engine */
- list_add_tail(&chan->chan.device_node,
- &pdev->device.channels);
+ list_add_tail(&chan->chan.device_node, &pdev->device.channels);
return 0;
}
{
struct mmp_pdma_device *d = ofdma->of_dma_data;
struct dma_chan *chan;
- struct mmp_pdma_chan *c;
chan = dma_get_any_slave_channel(&d->device);
if (!chan)
return NULL;
- c = to_mmp_pdma_chan(chan);
- c->drcmr = dma_spec->args[0];
+ to_mmp_pdma_chan(chan)->drcmr = dma_spec->args[0];
return chan;
}
pdev = devm_kzalloc(&op->dev, sizeof(*pdev), GFP_KERNEL);
if (!pdev)
return -ENOMEM;
+
pdev->dev = &op->dev;
spin_lock_init(&pdev->phy_lock);
of_id = of_match_device(mmp_pdma_dt_ids, pdev->dev);
if (of_id)
- of_property_read_u32(pdev->dev->of_node,
- "#dma-channels", &dma_channels);
+ of_property_read_u32(pdev->dev->of_node, "#dma-channels",
+ &dma_channels);
else if (pdata && pdata->dma_channels)
dma_channels = pdata->dma_channels;
else
irq_num++;
}
- pdev->phy = devm_kzalloc(pdev->dev,
- dma_channels * sizeof(struct mmp_pdma_chan), GFP_KERNEL);
+ pdev->phy = devm_kcalloc(pdev->dev,
+ dma_channels, sizeof(struct mmp_pdma_chan),
+ GFP_KERNEL);
if (pdev->phy == NULL)
return -ENOMEM;
if (irq_num != dma_channels) {
/* all chan share one irq, demux inside */
irq = platform_get_irq(op, 0);
- ret = devm_request_irq(pdev->dev, irq,
- mmp_pdma_int_handler, 0, "pdma", pdev);
+ ret = devm_request_irq(pdev->dev, irq, mmp_pdma_int_handler, 0,
+ "pdma", pdev);
if (ret)
return ret;
}
if (chan->device->dev->driver != &mmp_pdma_driver.driver)
return false;
- c->drcmr = *(unsigned int *) param;
+ c->drcmr = *(unsigned int *)param;
return true;
}
module_platform_driver(mmp_pdma_driver);
-MODULE_DESCRIPTION("MARVELL MMP Periphera DMA Driver");
+MODULE_DESCRIPTION("MARVELL MMP Peripheral DMA Driver");
MODULE_AUTHOR("Marvell International Ltd.");
MODULE_LICENSE("GPL v2");
int idx;
enum mmp_tdma_type type;
int irq;
- unsigned long reg_base;
+ void __iomem *reg_base;
size_t buf_len;
size_t period_len;
size_t pos;
+
+ struct gen_pool *pool;
};
#define TDMA_CHANNEL_NUM 2
static int mmp_tdma_config_chan(struct mmp_tdma_chan *tdmac)
{
- unsigned int tdcr;
+ unsigned int tdcr = 0;
mmp_tdma_disable_chan(tdmac);
struct gen_pool *gpool;
int size = tdmac->desc_num * sizeof(struct mmp_tdma_desc);
- gpool = sram_get_gpool("asram");
+ gpool = tdmac->pool;
if (tdmac->desc_arr)
gen_pool_free(gpool, (unsigned long)tdmac->desc_arr,
size);
struct gen_pool *gpool;
int size = tdmac->desc_num * sizeof(struct mmp_tdma_desc);
- gpool = sram_get_gpool("asram");
+ gpool = tdmac->pool;
if (!gpool)
return NULL;
}
static int mmp_tdma_chan_init(struct mmp_tdma_device *tdev,
- int idx, int irq, int type)
+ int idx, int irq,
+ int type, struct gen_pool *pool)
{
struct mmp_tdma_chan *tdmac;
tdmac->chan.device = &tdev->device;
tdmac->idx = idx;
tdmac->type = type;
- tdmac->reg_base = (unsigned long)tdev->base + idx * 4;
+ tdmac->reg_base = tdev->base + idx * 4;
+ tdmac->pool = pool;
tdmac->status = DMA_COMPLETE;
tdev->tdmac[tdmac->idx] = tdmac;
tasklet_init(&tdmac->tasklet, dma_do_tasklet, (unsigned long)tdmac);
int i, ret;
int irq = 0, irq_num = 0;
int chan_num = TDMA_CHANNEL_NUM;
+ struct gen_pool *pool;
of_id = of_match_device(mmp_tdma_dt_ids, &pdev->dev);
if (of_id)
INIT_LIST_HEAD(&tdev->device.channels);
+ if (pdev->dev.of_node)
+ pool = of_get_named_gen_pool(pdev->dev.of_node, "asram", 0);
+ else
+ pool = sram_get_gpool("asram");
+ if (!pool) {
+ dev_err(&pdev->dev, "asram pool not available\n");
+ return -ENOMEM;
+ }
+
if (irq_num != chan_num) {
irq = platform_get_irq(pdev, 0);
ret = devm_request_irq(&pdev->dev, irq,
/* initialize channel parameters */
for (i = 0; i < chan_num; i++) {
irq = (irq_num != chan_num) ? 0 : platform_get_irq(pdev, i);
- ret = mmp_tdma_chan_init(tdev, i, irq, type);
+ ret = mmp_tdma_chan_init(tdev, i, irq, type, pool);
if (ret)
return ret;
}
--- /dev/null
+/*
+ * MOXA ART SoCs DMA Engine support.
+ *
+ * Copyright (C) 2013 Jonas Jensen
+ *
+ * Jonas Jensen <jonas.jensen@gmail.com>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2. This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+#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/spinlock.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_dma.h>
+#include <linux/bitops.h>
+
+#include <asm/cacheflush.h>
+
+#include "dmaengine.h"
+#include "virt-dma.h"
+
+#define APB_DMA_MAX_CHANNEL 4
+
+#define REG_OFF_ADDRESS_SOURCE 0
+#define REG_OFF_ADDRESS_DEST 4
+#define REG_OFF_CYCLES 8
+#define REG_OFF_CTRL 12
+#define REG_OFF_CHAN_SIZE 16
+
+#define APB_DMA_ENABLE BIT(0)
+#define APB_DMA_FIN_INT_STS BIT(1)
+#define APB_DMA_FIN_INT_EN BIT(2)
+#define APB_DMA_BURST_MODE BIT(3)
+#define APB_DMA_ERR_INT_STS BIT(4)
+#define APB_DMA_ERR_INT_EN BIT(5)
+
+/*
+ * Unset: APB
+ * Set: AHB
+ */
+#define APB_DMA_SOURCE_SELECT 0x40
+#define APB_DMA_DEST_SELECT 0x80
+
+#define APB_DMA_SOURCE 0x100
+#define APB_DMA_DEST 0x1000
+
+#define APB_DMA_SOURCE_MASK 0x700
+#define APB_DMA_DEST_MASK 0x7000
+
+/*
+ * 000: No increment
+ * 001: +1 (Burst=0), +4 (Burst=1)
+ * 010: +2 (Burst=0), +8 (Burst=1)
+ * 011: +4 (Burst=0), +16 (Burst=1)
+ * 101: -1 (Burst=0), -4 (Burst=1)
+ * 110: -2 (Burst=0), -8 (Burst=1)
+ * 111: -4 (Burst=0), -16 (Burst=1)
+ */
+#define APB_DMA_SOURCE_INC_0 0
+#define APB_DMA_SOURCE_INC_1_4 0x100
+#define APB_DMA_SOURCE_INC_2_8 0x200
+#define APB_DMA_SOURCE_INC_4_16 0x300
+#define APB_DMA_SOURCE_DEC_1_4 0x500
+#define APB_DMA_SOURCE_DEC_2_8 0x600
+#define APB_DMA_SOURCE_DEC_4_16 0x700
+#define APB_DMA_DEST_INC_0 0
+#define APB_DMA_DEST_INC_1_4 0x1000
+#define APB_DMA_DEST_INC_2_8 0x2000
+#define APB_DMA_DEST_INC_4_16 0x3000
+#define APB_DMA_DEST_DEC_1_4 0x5000
+#define APB_DMA_DEST_DEC_2_8 0x6000
+#define APB_DMA_DEST_DEC_4_16 0x7000
+
+/*
+ * Request signal select source/destination address for DMA hardware handshake.
+ *
+ * The request line number is a property of the DMA controller itself,
+ * e.g. MMC must always request channels where dma_slave_config->slave_id is 5.
+ *
+ * 0: No request / Grant signal
+ * 1-15: Request / Grant signal
+ */
+#define APB_DMA_SOURCE_REQ_NO 0x1000000
+#define APB_DMA_SOURCE_REQ_NO_MASK 0xf000000
+#define APB_DMA_DEST_REQ_NO 0x10000
+#define APB_DMA_DEST_REQ_NO_MASK 0xf0000
+
+#define APB_DMA_DATA_WIDTH 0x100000
+#define APB_DMA_DATA_WIDTH_MASK 0x300000
+/*
+ * Data width of transfer:
+ *
+ * 00: Word
+ * 01: Half
+ * 10: Byte
+ */
+#define APB_DMA_DATA_WIDTH_4 0
+#define APB_DMA_DATA_WIDTH_2 0x100000
+#define APB_DMA_DATA_WIDTH_1 0x200000
+
+#define APB_DMA_CYCLES_MASK 0x00ffffff
+
+#define MOXART_DMA_DATA_TYPE_S8 0x00
+#define MOXART_DMA_DATA_TYPE_S16 0x01
+#define MOXART_DMA_DATA_TYPE_S32 0x02
+
+struct moxart_sg {
+ dma_addr_t addr;
+ uint32_t len;
+};
+
+struct moxart_desc {
+ enum dma_transfer_direction dma_dir;
+ dma_addr_t dev_addr;
+ unsigned int sglen;
+ unsigned int dma_cycles;
+ struct virt_dma_desc vd;
+ uint8_t es;
+ struct moxart_sg sg[0];
+};
+
+struct moxart_chan {
+ struct virt_dma_chan vc;
+
+ void __iomem *base;
+ struct moxart_desc *desc;
+
+ struct dma_slave_config cfg;
+
+ bool allocated;
+ bool error;
+ int ch_num;
+ unsigned int line_reqno;
+ unsigned int sgidx;
+};
+
+struct moxart_dmadev {
+ struct dma_device dma_slave;
+ struct moxart_chan slave_chans[APB_DMA_MAX_CHANNEL];
+};
+
+struct moxart_filter_data {
+ struct moxart_dmadev *mdc;
+ struct of_phandle_args *dma_spec;
+};
+
+static const unsigned int es_bytes[] = {
+ [MOXART_DMA_DATA_TYPE_S8] = 1,
+ [MOXART_DMA_DATA_TYPE_S16] = 2,
+ [MOXART_DMA_DATA_TYPE_S32] = 4,
+};
+
+static struct device *chan2dev(struct dma_chan *chan)
+{
+ return &chan->dev->device;
+}
+
+static inline struct moxart_chan *to_moxart_dma_chan(struct dma_chan *c)
+{
+ return container_of(c, struct moxart_chan, vc.chan);
+}
+
+static inline struct moxart_desc *to_moxart_dma_desc(
+ struct dma_async_tx_descriptor *t)
+{
+ return container_of(t, struct moxart_desc, vd.tx);
+}
+
+static void moxart_dma_desc_free(struct virt_dma_desc *vd)
+{
+ kfree(container_of(vd, struct moxart_desc, vd));
+}
+
+static int moxart_terminate_all(struct dma_chan *chan)
+{
+ struct moxart_chan *ch = to_moxart_dma_chan(chan);
+ unsigned long flags;
+ LIST_HEAD(head);
+ u32 ctrl;
+
+ dev_dbg(chan2dev(chan), "%s: ch=%p\n", __func__, ch);
+
+ spin_lock_irqsave(&ch->vc.lock, flags);
+
+ if (ch->desc)
+ ch->desc = NULL;
+
+ ctrl = readl(ch->base + REG_OFF_CTRL);
+ ctrl &= ~(APB_DMA_ENABLE | APB_DMA_FIN_INT_EN | APB_DMA_ERR_INT_EN);
+ writel(ctrl, ch->base + REG_OFF_CTRL);
+
+ vchan_get_all_descriptors(&ch->vc, &head);
+ spin_unlock_irqrestore(&ch->vc.lock, flags);
+ vchan_dma_desc_free_list(&ch->vc, &head);
+
+ return 0;
+}
+
+static int moxart_slave_config(struct dma_chan *chan,
+ struct dma_slave_config *cfg)
+{
+ struct moxart_chan *ch = to_moxart_dma_chan(chan);
+ u32 ctrl;
+
+ ch->cfg = *cfg;
+
+ ctrl = readl(ch->base + REG_OFF_CTRL);
+ ctrl |= APB_DMA_BURST_MODE;
+ ctrl &= ~(APB_DMA_DEST_MASK | APB_DMA_SOURCE_MASK);
+ ctrl &= ~(APB_DMA_DEST_REQ_NO_MASK | APB_DMA_SOURCE_REQ_NO_MASK);
+
+ switch (ch->cfg.src_addr_width) {
+ case DMA_SLAVE_BUSWIDTH_1_BYTE:
+ ctrl |= APB_DMA_DATA_WIDTH_1;
+ if (ch->cfg.direction != DMA_MEM_TO_DEV)
+ ctrl |= APB_DMA_DEST_INC_1_4;
+ else
+ ctrl |= APB_DMA_SOURCE_INC_1_4;
+ break;
+ case DMA_SLAVE_BUSWIDTH_2_BYTES:
+ ctrl |= APB_DMA_DATA_WIDTH_2;
+ if (ch->cfg.direction != DMA_MEM_TO_DEV)
+ ctrl |= APB_DMA_DEST_INC_2_8;
+ else
+ ctrl |= APB_DMA_SOURCE_INC_2_8;
+ break;
+ case DMA_SLAVE_BUSWIDTH_4_BYTES:
+ ctrl &= ~APB_DMA_DATA_WIDTH;
+ if (ch->cfg.direction != DMA_MEM_TO_DEV)
+ ctrl |= APB_DMA_DEST_INC_4_16;
+ else
+ ctrl |= APB_DMA_SOURCE_INC_4_16;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (ch->cfg.direction == DMA_MEM_TO_DEV) {
+ ctrl &= ~APB_DMA_DEST_SELECT;
+ ctrl |= APB_DMA_SOURCE_SELECT;
+ ctrl |= (ch->line_reqno << 16 &
+ APB_DMA_DEST_REQ_NO_MASK);
+ } else {
+ ctrl |= APB_DMA_DEST_SELECT;
+ ctrl &= ~APB_DMA_SOURCE_SELECT;
+ ctrl |= (ch->line_reqno << 24 &
+ APB_DMA_SOURCE_REQ_NO_MASK);
+ }
+
+ writel(ctrl, ch->base + REG_OFF_CTRL);
+
+ return 0;
+}
+
+static int moxart_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
+ unsigned long arg)
+{
+ int ret = 0;
+
+ switch (cmd) {
+ case DMA_PAUSE:
+ case DMA_RESUME:
+ return -EINVAL;
+ case DMA_TERMINATE_ALL:
+ moxart_terminate_all(chan);
+ break;
+ case DMA_SLAVE_CONFIG:
+ ret = moxart_slave_config(chan, (struct dma_slave_config *)arg);
+ break;
+ default:
+ ret = -ENOSYS;
+ }
+
+ return ret;
+}
+
+static struct dma_async_tx_descriptor *moxart_prep_slave_sg(
+ struct dma_chan *chan, struct scatterlist *sgl,
+ unsigned int sg_len, enum dma_transfer_direction dir,
+ unsigned long tx_flags, void *context)
+{
+ struct moxart_chan *ch = to_moxart_dma_chan(chan);
+ struct moxart_desc *d;
+ enum dma_slave_buswidth dev_width;
+ dma_addr_t dev_addr;
+ struct scatterlist *sgent;
+ unsigned int es;
+ unsigned int i;
+
+ if (!is_slave_direction(dir)) {
+ dev_err(chan2dev(chan), "%s: invalid DMA direction\n",
+ __func__);
+ return NULL;
+ }
+
+ if (dir == DMA_DEV_TO_MEM) {
+ dev_addr = ch->cfg.src_addr;
+ dev_width = ch->cfg.src_addr_width;
+ } else {
+ dev_addr = ch->cfg.dst_addr;
+ dev_width = ch->cfg.dst_addr_width;
+ }
+
+ switch (dev_width) {
+ case DMA_SLAVE_BUSWIDTH_1_BYTE:
+ es = MOXART_DMA_DATA_TYPE_S8;
+ break;
+ case DMA_SLAVE_BUSWIDTH_2_BYTES:
+ es = MOXART_DMA_DATA_TYPE_S16;
+ break;
+ case DMA_SLAVE_BUSWIDTH_4_BYTES:
+ es = MOXART_DMA_DATA_TYPE_S32;
+ break;
+ default:
+ dev_err(chan2dev(chan), "%s: unsupported data width (%u)\n",
+ __func__, dev_width);
+ return NULL;
+ }
+
+ d = kzalloc(sizeof(*d) + sg_len * sizeof(d->sg[0]), GFP_ATOMIC);
+ if (!d)
+ return NULL;
+
+ d->dma_dir = dir;
+ d->dev_addr = dev_addr;
+ d->es = es;
+
+ for_each_sg(sgl, sgent, sg_len, i) {
+ d->sg[i].addr = sg_dma_address(sgent);
+ d->sg[i].len = sg_dma_len(sgent);
+ }
+
+ d->sglen = sg_len;
+
+ ch->error = 0;
+
+ return vchan_tx_prep(&ch->vc, &d->vd, tx_flags);
+}
+
+static struct dma_chan *moxart_of_xlate(struct of_phandle_args *dma_spec,
+ struct of_dma *ofdma)
+{
+ struct moxart_dmadev *mdc = ofdma->of_dma_data;
+ struct dma_chan *chan;
+ struct moxart_chan *ch;
+
+ chan = dma_get_any_slave_channel(&mdc->dma_slave);
+ if (!chan)
+ return NULL;
+
+ ch = to_moxart_dma_chan(chan);
+ ch->line_reqno = dma_spec->args[0];
+
+ return chan;
+}
+
+static int moxart_alloc_chan_resources(struct dma_chan *chan)
+{
+ struct moxart_chan *ch = to_moxart_dma_chan(chan);
+
+ dev_dbg(chan2dev(chan), "%s: allocating channel #%u\n",
+ __func__, ch->ch_num);
+ ch->allocated = 1;
+
+ return 0;
+}
+
+static void moxart_free_chan_resources(struct dma_chan *chan)
+{
+ struct moxart_chan *ch = to_moxart_dma_chan(chan);
+
+ vchan_free_chan_resources(&ch->vc);
+
+ dev_dbg(chan2dev(chan), "%s: freeing channel #%u\n",
+ __func__, ch->ch_num);
+ ch->allocated = 0;
+}
+
+static void moxart_dma_set_params(struct moxart_chan *ch, dma_addr_t src_addr,
+ dma_addr_t dst_addr)
+{
+ writel(src_addr, ch->base + REG_OFF_ADDRESS_SOURCE);
+ writel(dst_addr, ch->base + REG_OFF_ADDRESS_DEST);
+}
+
+static void moxart_set_transfer_params(struct moxart_chan *ch, unsigned int len)
+{
+ struct moxart_desc *d = ch->desc;
+ unsigned int sglen_div = es_bytes[d->es];
+
+ d->dma_cycles = len >> sglen_div;
+
+ /*
+ * There are 4 cycles on 64 bytes copied, i.e. one cycle copies 16
+ * bytes ( when width is APB_DMAB_DATA_WIDTH_4 ).
+ */
+ writel(d->dma_cycles, ch->base + REG_OFF_CYCLES);
+
+ dev_dbg(chan2dev(&ch->vc.chan), "%s: set %u DMA cycles (len=%u)\n",
+ __func__, d->dma_cycles, len);
+}
+
+static void moxart_start_dma(struct moxart_chan *ch)
+{
+ u32 ctrl;
+
+ ctrl = readl(ch->base + REG_OFF_CTRL);
+ ctrl |= (APB_DMA_ENABLE | APB_DMA_FIN_INT_EN | APB_DMA_ERR_INT_EN);
+ writel(ctrl, ch->base + REG_OFF_CTRL);
+}
+
+static void moxart_dma_start_sg(struct moxart_chan *ch, unsigned int idx)
+{
+ struct moxart_desc *d = ch->desc;
+ struct moxart_sg *sg = ch->desc->sg + idx;
+
+ if (ch->desc->dma_dir == DMA_MEM_TO_DEV)
+ moxart_dma_set_params(ch, sg->addr, d->dev_addr);
+ else if (ch->desc->dma_dir == DMA_DEV_TO_MEM)
+ moxart_dma_set_params(ch, d->dev_addr, sg->addr);
+
+ moxart_set_transfer_params(ch, sg->len);
+
+ moxart_start_dma(ch);
+}
+
+static void moxart_dma_start_desc(struct dma_chan *chan)
+{
+ struct moxart_chan *ch = to_moxart_dma_chan(chan);
+ struct virt_dma_desc *vd;
+
+ vd = vchan_next_desc(&ch->vc);
+
+ if (!vd) {
+ ch->desc = NULL;
+ return;
+ }
+
+ list_del(&vd->node);
+
+ ch->desc = to_moxart_dma_desc(&vd->tx);
+ ch->sgidx = 0;
+
+ moxart_dma_start_sg(ch, 0);
+}
+
+static void moxart_issue_pending(struct dma_chan *chan)
+{
+ struct moxart_chan *ch = to_moxart_dma_chan(chan);
+ unsigned long flags;
+
+ spin_lock_irqsave(&ch->vc.lock, flags);
+ if (vchan_issue_pending(&ch->vc) && !ch->desc)
+ moxart_dma_start_desc(chan);
+ spin_unlock_irqrestore(&ch->vc.lock, flags);
+}
+
+static size_t moxart_dma_desc_size(struct moxart_desc *d,
+ unsigned int completed_sgs)
+{
+ unsigned int i;
+ size_t size;
+
+ for (size = i = completed_sgs; i < d->sglen; i++)
+ size += d->sg[i].len;
+
+ return size;
+}
+
+static size_t moxart_dma_desc_size_in_flight(struct moxart_chan *ch)
+{
+ size_t size;
+ unsigned int completed_cycles, cycles;
+
+ size = moxart_dma_desc_size(ch->desc, ch->sgidx);
+ cycles = readl(ch->base + REG_OFF_CYCLES);
+ completed_cycles = (ch->desc->dma_cycles - cycles);
+ size -= completed_cycles << es_bytes[ch->desc->es];
+
+ dev_dbg(chan2dev(&ch->vc.chan), "%s: size=%zu\n", __func__, size);
+
+ return size;
+}
+
+static enum dma_status moxart_tx_status(struct dma_chan *chan,
+ dma_cookie_t cookie,
+ struct dma_tx_state *txstate)
+{
+ struct moxart_chan *ch = to_moxart_dma_chan(chan);
+ struct virt_dma_desc *vd;
+ struct moxart_desc *d;
+ enum dma_status ret;
+ unsigned long flags;
+
+ /*
+ * dma_cookie_status() assigns initial residue value.
+ */
+ ret = dma_cookie_status(chan, cookie, txstate);
+
+ spin_lock_irqsave(&ch->vc.lock, flags);
+ vd = vchan_find_desc(&ch->vc, cookie);
+ if (vd) {
+ d = to_moxart_dma_desc(&vd->tx);
+ txstate->residue = moxart_dma_desc_size(d, 0);
+ } else if (ch->desc && ch->desc->vd.tx.cookie == cookie) {
+ txstate->residue = moxart_dma_desc_size_in_flight(ch);
+ }
+ spin_unlock_irqrestore(&ch->vc.lock, flags);
+
+ if (ch->error)
+ return DMA_ERROR;
+
+ return ret;
+}
+
+static void moxart_dma_init(struct dma_device *dma, struct device *dev)
+{
+ dma->device_prep_slave_sg = moxart_prep_slave_sg;
+ dma->device_alloc_chan_resources = moxart_alloc_chan_resources;
+ dma->device_free_chan_resources = moxart_free_chan_resources;
+ dma->device_issue_pending = moxart_issue_pending;
+ dma->device_tx_status = moxart_tx_status;
+ dma->device_control = moxart_control;
+ dma->dev = dev;
+
+ INIT_LIST_HEAD(&dma->channels);
+}
+
+static irqreturn_t moxart_dma_interrupt(int irq, void *devid)
+{
+ struct moxart_dmadev *mc = devid;
+ struct moxart_chan *ch = &mc->slave_chans[0];
+ unsigned int i;
+ unsigned long flags;
+ u32 ctrl;
+
+ dev_dbg(chan2dev(&ch->vc.chan), "%s\n", __func__);
+
+ for (i = 0; i < APB_DMA_MAX_CHANNEL; i++, ch++) {
+ if (!ch->allocated)
+ continue;
+
+ ctrl = readl(ch->base + REG_OFF_CTRL);
+
+ dev_dbg(chan2dev(&ch->vc.chan), "%s: ch=%p ch->base=%p ctrl=%x\n",
+ __func__, ch, ch->base, ctrl);
+
+ if (ctrl & APB_DMA_FIN_INT_STS) {
+ ctrl &= ~APB_DMA_FIN_INT_STS;
+ if (ch->desc) {
+ spin_lock_irqsave(&ch->vc.lock, flags);
+ if (++ch->sgidx < ch->desc->sglen) {
+ moxart_dma_start_sg(ch, ch->sgidx);
+ } else {
+ vchan_cookie_complete(&ch->desc->vd);
+ moxart_dma_start_desc(&ch->vc.chan);
+ }
+ spin_unlock_irqrestore(&ch->vc.lock, flags);
+ }
+ }
+
+ if (ctrl & APB_DMA_ERR_INT_STS) {
+ ctrl &= ~APB_DMA_ERR_INT_STS;
+ ch->error = 1;
+ }
+
+ writel(ctrl, ch->base + REG_OFF_CTRL);
+ }
+
+ return IRQ_HANDLED;
+}
+
+static int moxart_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct device_node *node = dev->of_node;
+ struct resource *res;
+ static void __iomem *dma_base_addr;
+ int ret, i;
+ unsigned int irq;
+ struct moxart_chan *ch;
+ struct moxart_dmadev *mdc;
+
+ mdc = devm_kzalloc(dev, sizeof(*mdc), GFP_KERNEL);
+ if (!mdc) {
+ dev_err(dev, "can't allocate DMA container\n");
+ return -ENOMEM;
+ }
+
+ irq = irq_of_parse_and_map(node, 0);
+ if (irq == NO_IRQ) {
+ dev_err(dev, "no IRQ resource\n");
+ return -EINVAL;
+ }
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ dma_base_addr = devm_ioremap_resource(dev, res);
+ if (IS_ERR(dma_base_addr))
+ return PTR_ERR(dma_base_addr);
+
+ dma_cap_zero(mdc->dma_slave.cap_mask);
+ dma_cap_set(DMA_SLAVE, mdc->dma_slave.cap_mask);
+ dma_cap_set(DMA_PRIVATE, mdc->dma_slave.cap_mask);
+
+ moxart_dma_init(&mdc->dma_slave, dev);
+
+ ch = &mdc->slave_chans[0];
+ for (i = 0; i < APB_DMA_MAX_CHANNEL; i++, ch++) {
+ ch->ch_num = i;
+ ch->base = dma_base_addr + i * REG_OFF_CHAN_SIZE;
+ ch->allocated = 0;
+
+ ch->vc.desc_free = moxart_dma_desc_free;
+ vchan_init(&ch->vc, &mdc->dma_slave);
+
+ dev_dbg(dev, "%s: chs[%d]: ch->ch_num=%u ch->base=%p\n",
+ __func__, i, ch->ch_num, ch->base);
+ }
+
+ platform_set_drvdata(pdev, mdc);
+
+ ret = devm_request_irq(dev, irq, moxart_dma_interrupt, 0,
+ "moxart-dma-engine", mdc);
+ if (ret) {
+ dev_err(dev, "devm_request_irq failed\n");
+ return ret;
+ }
+
+ ret = dma_async_device_register(&mdc->dma_slave);
+ if (ret) {
+ dev_err(dev, "dma_async_device_register failed\n");
+ return ret;
+ }
+
+ ret = of_dma_controller_register(node, moxart_of_xlate, mdc);
+ if (ret) {
+ dev_err(dev, "of_dma_controller_register failed\n");
+ dma_async_device_unregister(&mdc->dma_slave);
+ return ret;
+ }
+
+ dev_dbg(dev, "%s: IRQ=%u\n", __func__, irq);
+
+ return 0;
+}
+
+static int moxart_remove(struct platform_device *pdev)
+{
+ struct moxart_dmadev *m = platform_get_drvdata(pdev);
+
+ dma_async_device_unregister(&m->dma_slave);
+
+ if (pdev->dev.of_node)
+ of_dma_controller_free(pdev->dev.of_node);
+
+ return 0;
+}
+
+static const struct of_device_id moxart_dma_match[] = {
+ { .compatible = "moxa,moxart-dma" },
+ { }
+};
+
+static struct platform_driver moxart_driver = {
+ .probe = moxart_probe,
+ .remove = moxart_remove,
+ .driver = {
+ .name = "moxart-dma-engine",
+ .owner = THIS_MODULE,
+ .of_match_table = moxart_dma_match,
+ },
+};
+
+static int moxart_init(void)
+{
+ return platform_driver_register(&moxart_driver);
+}
+subsys_initcall(moxart_init);
+
+static void __exit moxart_exit(void)
+{
+ platform_driver_unregister(&moxart_driver);
+}
+module_exit(moxart_exit);
+
+MODULE_AUTHOR("Jonas Jensen <jonas.jensen@gmail.com>");
+MODULE_DESCRIPTION("MOXART DMA engine driver");
+MODULE_LICENSE("GPL v2");
{
struct omap_chan *c = to_omap_dma_chan(chan);
- dev_info(c->vc.chan.device->dev, "allocating channel for %u\n", c->dma_sig);
+ dev_dbg(c->vc.chan.device->dev, "allocating channel for %u\n", c->dma_sig);
return omap_request_dma(c->dma_sig, "DMA engine",
omap_dma_callback, c, &c->dma_ch);
vchan_free_chan_resources(&c->vc);
omap_free_dma(c->dma_ch);
- dev_info(c->vc.chan.device->dev, "freeing channel for %u\n", c->dma_sig);
+ dev_dbg(c->vc.chan.device->dev, "freeing channel for %u\n", c->dma_sig);
}
static size_t omap_dma_sg_size(struct omap_sg *sg)
/* DMA-Engine Channel */
struct dma_chan chan;
- /* List of to be xfered descriptors */
+ /* List of submitted descriptors */
+ struct list_head submitted_list;
+ /* List of issued descriptors */
struct list_head work_list;
/* List of completed descriptors */
struct list_head completed_list;
/* DMA-Engine Device */
struct dma_device ddma;
+ /* Holds info about sg limitations */
+ struct device_dma_parameters dma_parms;
+
/* Pool of descriptors available for the DMAC's channels */
struct list_head desc_pool;
/* To protect desc_pool manipulation */
spinlock_t pool_lock;
/* Peripheral channels connected to this DMAC */
+ unsigned int num_peripherals;
struct dma_pl330_chan *peripherals; /* keep at end */
};
struct dma_pl330_chan *pchan;
};
-struct dma_pl330_filter_args {
- struct dma_pl330_dmac *pdmac;
- unsigned int chan_id;
-};
-
static inline void _callback(struct pl330_req *r, enum pl330_op_err err)
{
if (r && r->xfer_cb)
tasklet_schedule(&pch->task);
}
-static bool pl330_dt_filter(struct dma_chan *chan, void *param)
-{
- struct dma_pl330_filter_args *fargs = param;
-
- if (chan->device != &fargs->pdmac->ddma)
- return false;
-
- return (chan->chan_id == fargs->chan_id);
-}
-
bool pl330_filter(struct dma_chan *chan, void *param)
{
u8 *peri_id;
{
int count = dma_spec->args_count;
struct dma_pl330_dmac *pdmac = ofdma->of_dma_data;
- struct dma_pl330_filter_args fargs;
- dma_cap_mask_t cap;
-
- if (!pdmac)
- return NULL;
+ unsigned int chan_id;
if (count != 1)
return NULL;
- fargs.pdmac = pdmac;
- fargs.chan_id = dma_spec->args[0];
-
- dma_cap_zero(cap);
- dma_cap_set(DMA_SLAVE, cap);
- dma_cap_set(DMA_CYCLIC, cap);
+ chan_id = dma_spec->args[0];
+ if (chan_id >= pdmac->num_peripherals)
+ return NULL;
- return dma_request_channel(cap, pl330_dt_filter, &fargs);
+ return dma_get_slave_channel(&pdmac->peripherals[chan_id].chan);
}
static int pl330_alloc_chan_resources(struct dma_chan *chan)
pl330_chan_ctrl(pch->pl330_chid, PL330_OP_FLUSH);
/* Mark all desc done */
+ list_for_each_entry(desc, &pch->submitted_list, node) {
+ desc->status = FREE;
+ dma_cookie_complete(&desc->txd);
+ }
+
list_for_each_entry(desc, &pch->work_list , node) {
desc->status = FREE;
dma_cookie_complete(&desc->txd);
dma_cookie_complete(&desc->txd);
}
+ list_splice_tail_init(&pch->submitted_list, &pdmac->desc_pool);
list_splice_tail_init(&pch->work_list, &pdmac->desc_pool);
list_splice_tail_init(&pch->completed_list, &pdmac->desc_pool);
spin_unlock_irqrestore(&pch->lock, flags);
static void pl330_issue_pending(struct dma_chan *chan)
{
- pl330_tasklet((unsigned long) to_pchan(chan));
+ struct dma_pl330_chan *pch = to_pchan(chan);
+ unsigned long flags;
+
+ spin_lock_irqsave(&pch->lock, flags);
+ list_splice_tail_init(&pch->submitted_list, &pch->work_list);
+ spin_unlock_irqrestore(&pch->lock, flags);
+
+ pl330_tasklet((unsigned long)pch);
}
/*
dma_cookie_assign(&desc->txd);
- list_move_tail(&desc->node, &pch->work_list);
+ list_move_tail(&desc->node, &pch->submitted_list);
}
cookie = dma_cookie_assign(&last->txd);
- list_add_tail(&last->node, &pch->work_list);
+ list_add_tail(&last->node, &pch->submitted_list);
spin_unlock_irqrestore(&pch->lock, flags);
return cookie;
else
num_chan = max_t(int, pi->pcfg.num_peri, pi->pcfg.num_chan);
+ pdmac->num_peripherals = num_chan;
+
pdmac->peripherals = kzalloc(num_chan * sizeof(*pch), GFP_KERNEL);
if (!pdmac->peripherals) {
ret = -ENOMEM;
else
pch->chan.private = adev->dev.of_node;
+ INIT_LIST_HEAD(&pch->submitted_list);
INIT_LIST_HEAD(&pch->work_list);
INIT_LIST_HEAD(&pch->completed_list);
spin_lock_init(&pch->lock);
"unable to register DMA to the generic DT DMA helpers\n");
}
}
+
+ adev->dev.dma_parms = &pdmac->dma_parms;
+
/*
* This is the limit for transfers with a buswidth of 1, larger
* buswidths will have larger limits.
regs = ioremap(res.start, resource_size(&res));
if (!regs) {
dev_err(&ofdev->dev, "failed to ioremap regs!\n");
+ ret = -ENOMEM;
goto err_regs_alloc;
}
}
EXPORT_SYMBOL(sirfsoc_dma_filter_id);
+#define SIRFSOC_DMA_BUSWIDTHS \
+ (BIT(DMA_SLAVE_BUSWIDTH_UNDEFINED) | \
+ BIT(DMA_SLAVE_BUSWIDTH_1_BYTE) | \
+ BIT(DMA_SLAVE_BUSWIDTH_2_BYTES) | \
+ BIT(DMA_SLAVE_BUSWIDTH_4_BYTES) | \
+ BIT(DMA_SLAVE_BUSWIDTH_8_BYTES))
+
+static int sirfsoc_dma_device_slave_caps(struct dma_chan *dchan,
+ struct dma_slave_caps *caps)
+{
+ caps->src_addr_widths = SIRFSOC_DMA_BUSWIDTHS;
+ caps->dstn_addr_widths = SIRFSOC_DMA_BUSWIDTHS;
+ caps->directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV);
+ caps->cmd_pause = true;
+ caps->cmd_terminate = true;
+
+ return 0;
+}
+
static int sirfsoc_dma_probe(struct platform_device *op)
{
struct device_node *dn = op->dev.of_node;
dma->device_tx_status = sirfsoc_dma_tx_status;
dma->device_prep_interleaved_dma = sirfsoc_dma_prep_interleaved;
dma->device_prep_dma_cyclic = sirfsoc_dma_prep_cyclic;
+ dma->device_slave_caps = sirfsoc_dma_device_slave_caps;
INIT_LIST_HEAD(&dma->channels);
dma_cap_set(DMA_SLAVE, dma->cap_mask);
#define TEGRA_APBDMA_APBSEQ_DATA_SWAP BIT(27)
#define TEGRA_APBDMA_APBSEQ_WRAP_WORD_1 (1 << 16)
+/* Tegra148 specific registers */
+#define TEGRA_APBDMA_CHAN_WCOUNT 0x20
+
+#define TEGRA_APBDMA_CHAN_WORD_TRANSFER 0x24
+
/*
* If any burst is in flight and DMA paused then this is the time to complete
* on-flight burst and update DMA status register.
/* Channel base address offset from APBDMA base address */
#define TEGRA_APBDMA_CHANNEL_BASE_ADD_OFFSET 0x1000
-/* DMA channel register space size */
-#define TEGRA_APBDMA_CHANNEL_REGISTER_SIZE 0x20
-
struct tegra_dma;
/*
* tegra_dma_chip_data Tegra chip specific DMA data
* @nr_channels: Number of channels available in the controller.
+ * @channel_reg_size: Channel register size/stride.
* @max_dma_count: Maximum DMA transfer count supported by DMA controller.
* @support_channel_pause: Support channel wise pause of dma.
+ * @support_separate_wcount_reg: Support separate word count register.
*/
struct tegra_dma_chip_data {
int nr_channels;
+ int channel_reg_size;
int max_dma_count;
bool support_channel_pause;
+ bool support_separate_wcount_reg;
};
/* DMA channel registers */
unsigned long apb_ptr;
unsigned long ahb_seq;
unsigned long apb_seq;
+ unsigned long wcount;
};
/*
tdc_write(tdc, TEGRA_APBDMA_CHAN_APBPTR, ch_regs->apb_ptr);
tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBSEQ, ch_regs->ahb_seq);
tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBPTR, ch_regs->ahb_ptr);
+ if (tdc->tdma->chip_data->support_separate_wcount_reg)
+ tdc_write(tdc, TEGRA_APBDMA_CHAN_WCOUNT, ch_regs->wcount);
/* Start DMA */
tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR,
/* Safe to program new configuration */
tdc_write(tdc, TEGRA_APBDMA_CHAN_APBPTR, nsg_req->ch_regs.apb_ptr);
tdc_write(tdc, TEGRA_APBDMA_CHAN_AHBPTR, nsg_req->ch_regs.ahb_ptr);
+ if (tdc->tdma->chip_data->support_separate_wcount_reg)
+ tdc_write(tdc, TEGRA_APBDMA_CHAN_WCOUNT,
+ nsg_req->ch_regs.wcount);
tdc_write(tdc, TEGRA_APBDMA_CHAN_CSR,
nsg_req->ch_regs.csr | TEGRA_APBDMA_CSR_ENB);
nsg_req->configured = true;
struct tegra_dma_desc *dma_desc;
unsigned long flags;
unsigned long status;
+ unsigned long wcount;
bool was_busy;
spin_lock_irqsave(&tdc->lock, flags);
tdc->isr_handler(tdc, true);
status = tdc_read(tdc, TEGRA_APBDMA_CHAN_STATUS);
}
+ if (tdc->tdma->chip_data->support_separate_wcount_reg)
+ wcount = tdc_read(tdc, TEGRA_APBDMA_CHAN_WORD_TRANSFER);
+ else
+ wcount = status;
was_busy = tdc->busy;
tegra_dma_stop(tdc);
sgreq = list_first_entry(&tdc->pending_sg_req,
typeof(*sgreq), node);
sgreq->dma_desc->bytes_transferred +=
- get_current_xferred_count(tdc, sgreq, status);
+ get_current_xferred_count(tdc, sgreq, wcount);
}
tegra_dma_resume(tdc);
return -EINVAL;
}
+static void tegra_dma_prep_wcount(struct tegra_dma_channel *tdc,
+ struct tegra_dma_channel_regs *ch_regs, u32 len)
+{
+ u32 len_field = (len - 4) & 0xFFFC;
+
+ if (tdc->tdma->chip_data->support_separate_wcount_reg)
+ ch_regs->wcount = len_field;
+ else
+ ch_regs->csr |= len_field;
+}
+
static struct dma_async_tx_descriptor *tegra_dma_prep_slave_sg(
struct dma_chan *dc, struct scatterlist *sgl, unsigned int sg_len,
enum dma_transfer_direction direction, unsigned long flags,
sg_req->ch_regs.apb_ptr = apb_ptr;
sg_req->ch_regs.ahb_ptr = mem;
- sg_req->ch_regs.csr = csr | ((len - 4) & 0xFFFC);
+ sg_req->ch_regs.csr = csr;
+ tegra_dma_prep_wcount(tdc, &sg_req->ch_regs, len);
sg_req->ch_regs.apb_seq = apb_seq;
sg_req->ch_regs.ahb_seq = ahb_seq;
sg_req->configured = false;
ahb_seq |= get_burst_size(tdc, burst_size, slave_bw, len);
sg_req->ch_regs.apb_ptr = apb_ptr;
sg_req->ch_regs.ahb_ptr = mem;
- sg_req->ch_regs.csr = csr | ((len - 4) & 0xFFFC);
+ sg_req->ch_regs.csr = csr;
+ tegra_dma_prep_wcount(tdc, &sg_req->ch_regs, len);
sg_req->ch_regs.apb_seq = apb_seq;
sg_req->ch_regs.ahb_seq = ahb_seq;
sg_req->configured = false;
/* Tegra20 specific DMA controller information */
static const struct tegra_dma_chip_data tegra20_dma_chip_data = {
.nr_channels = 16,
+ .channel_reg_size = 0x20,
.max_dma_count = 1024UL * 64,
.support_channel_pause = false,
+ .support_separate_wcount_reg = false,
};
/* Tegra30 specific DMA controller information */
static const struct tegra_dma_chip_data tegra30_dma_chip_data = {
.nr_channels = 32,
+ .channel_reg_size = 0x20,
.max_dma_count = 1024UL * 64,
.support_channel_pause = false,
+ .support_separate_wcount_reg = false,
};
/* Tegra114 specific DMA controller information */
static const struct tegra_dma_chip_data tegra114_dma_chip_data = {
.nr_channels = 32,
+ .channel_reg_size = 0x20,
.max_dma_count = 1024UL * 64,
.support_channel_pause = true,
+ .support_separate_wcount_reg = false,
+};
+
+/* Tegra148 specific DMA controller information */
+static const struct tegra_dma_chip_data tegra148_dma_chip_data = {
+ .nr_channels = 32,
+ .channel_reg_size = 0x40,
+ .max_dma_count = 1024UL * 64,
+ .support_channel_pause = true,
+ .support_separate_wcount_reg = true,
};
static const struct of_device_id tegra_dma_of_match[] = {
{
+ .compatible = "nvidia,tegra148-apbdma",
+ .data = &tegra148_dma_chip_data,
+ }, {
.compatible = "nvidia,tegra114-apbdma",
.data = &tegra114_dma_chip_data,
}, {
struct tegra_dma_channel *tdc = &tdma->channels[i];
tdc->chan_base_offset = TEGRA_APBDMA_CHANNEL_BASE_ADD_OFFSET +
- i * TEGRA_APBDMA_CHANNEL_REGISTER_SIZE;
+ i * cdata->channel_reg_size;
res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
if (!res) {
static inline void vchan_cookie_complete(struct virt_dma_desc *vd)
{
struct virt_dma_chan *vc = to_virt_chan(vd->tx.chan);
+ dma_cookie_t cookie;
+ cookie = vd->tx.cookie;
dma_cookie_complete(&vd->tx);
dev_vdbg(vc->chan.device->dev, "txd %p[%x]: marked complete\n",
- vd, vd->tx.cookie);
+ vd, cookie);
list_add_tail(&vd->node, &vc->desc_completed);
tasklet_schedule(&vc->task);
* @dev: class device for sysfs
* @device_node: used to add this to the device chan list
* @local: per-cpu pointer to a struct dma_chan_percpu
- * @client-count: how many clients are using this channel
+ * @client_count: how many clients are using this channel
* @table_count: number of appearances in the mem-to-mem allocation table
* @private: private data for certain client-channel associations
*/
/**
* struct dma_chan_dev - relate sysfs device node to backing channel device
- * @chan - driver channel device
- * @device - sysfs device
- * @dev_id - parent dma_device dev_id
- * @idr_ref - reference count to gate release of dma_device dev_id
+ * @chan: driver channel device
+ * @device: sysfs device
+ * @dev_id: parent dma_device dev_id
+ * @idr_ref: reference count to gate release of dma_device dev_id
*/
struct dma_chan_dev {
struct dma_chan *chan;
/**
* struct dma_slave_config - dma slave channel runtime config
* @direction: whether the data shall go in or out on this slave
- * channel, right now. DMA_TO_DEVICE and DMA_FROM_DEVICE are
- * legal values, DMA_BIDIRECTIONAL is not acceptable since we
- * need to differentiate source and target addresses.
+ * channel, right now. DMA_MEM_TO_DEV and DMA_DEV_TO_MEM are
+ * legal values.
* @src_addr: this is the physical address where DMA slave data
* should be read (RX), if the source is memory this argument is
* ignored.
s32 dptc_dvfs_addr;
s32 utra_addr;
s32 ram_code_start_addr;
+ /* End of v1 array */
+ s32 mcu_2_ssish_addr;
+ s32 ssish_2_mcu_addr;
+ s32 hdmi_dma_addr;
+ /* End of v2 array */
};
/**
IMX_DMATYPE_IPU_MEMORY, /* IPU Memory */
IMX_DMATYPE_ASRC, /* ASRC */
IMX_DMATYPE_ESAI, /* ESAI */
+ IMX_DMATYPE_SSI_DUAL, /* SSI Dual FIFO */
};
enum imx_dma_prio {
/*
- * linux/arch/arm/mach-mmp/include/mach/sram.h
- *
* SRAM Memory Management
*
* Copyright (c) 2011 Marvell Semiconductors Inc.
*
*/
-#ifndef __ASM_ARCH_SRAM_H
-#define __ASM_ARCH_SRAM_H
+#ifndef __DMA_MMP_TDMA_H
+#define __DMA_MMP_TDMA_H
#include <linux/genalloc.h>
extern struct gen_pool *sram_get_gpool(char *pool_name);
-#endif /* __ASM_ARCH_SRAM_H */
+#endif /* __DMA_MMP_TDMA_H */
/*
- * arch/arm/plat-orion/include/plat/mv_xor.h
- *
* Marvell XOR platform device data definition file.
*/
-#ifndef __PLAT_MV_XOR_H
-#define __PLAT_MV_XOR_H
+#ifndef __DMA_MV_XOR_H
+#define __DMA_MV_XOR_H
#include <linux/dmaengine.h>
#include <linux/mbus.h>
bool baudclk_locked;
bool irq_stats;
bool offline_config;
+ bool use_dual_fifo;
u8 i2s_mode;
spinlock_t baudclk_lock;
struct clk *baudclk;
CCSR_SSI_SxCCR_DC(2));
}
+ if (ssi_private->use_dual_fifo) {
+ write_ssi_mask(&ssi->srcr, 0, CCSR_SSI_SRCR_RFEN1);
+ write_ssi_mask(&ssi->stcr, 0, CCSR_SSI_STCR_TFEN1);
+ write_ssi_mask(&ssi->scr, 0, CCSR_SSI_SCR_TCH_EN);
+ }
+
return 0;
}
spin_unlock_irqrestore(&ssi_private->baudclk_lock, flags);
}
+ /* When using dual fifo mode, it is safer to ensure an even period
+ * size. If appearing to an odd number while DMA always starts its
+ * task from fifo0, fifo1 would be neglected at the end of each
+ * period. But SSI would still access fifo1 with an invalid data.
+ */
+ if (ssi_private->use_dual_fifo)
+ snd_pcm_hw_constraint_step(substream->runtime, 0,
+ SNDRV_PCM_HW_PARAM_PERIOD_SIZE, 2);
+
return 0;
}
if (hw_type == FSL_SSI_MX21 || hw_type == FSL_SSI_MX51 ||
hw_type == FSL_SSI_MX35) {
- u32 dma_events[2];
+ u32 dma_events[2], dmas[4];
ssi_private->ssi_on_imx = true;
ssi_private->clk = devm_clk_get(&pdev->dev, NULL);
goto error_clk;
}
}
+ /* Should this be merge with the above? */
+ if (!of_property_read_u32_array(pdev->dev.of_node, "dmas", dmas, 4)
+ && dmas[2] == IMX_DMATYPE_SSI_DUAL) {
+ ssi_private->use_dual_fifo = true;
+ /* When using dual fifo mode, we need to keep watermark
+ * as even numbers due to dma script limitation.
+ */
+ ssi_private->dma_params_tx.maxburst &= ~0x1;
+ ssi_private->dma_params_rx.maxburst &= ~0x1;
+ }
shared = of_device_is_compatible(of_get_parent(np),
"fsl,spba-bus");
projects / ~andy / linux / commitdiff