ipq806x: Add ADM support

These are cherry-picked & backported from LKML:
*https://lkml.org/lkml/2015/3/17/19

They are enabled on both 3.18 and 4.1 kernel. Patches 150 to 154 are
applying changes merged since 3.18; they enable mechanisms used by the
ADM driver.

ADM engine is used by the NAND controller, so it is necessary to
bring-up NAND flash support.

Signed-off-by: Mathieu Olivari <mathieu@codeaurora.org>

SVN-Revision: 46567

1 files changed, 958 insertions, 0 deletions

diff --git a/target/linux/ipq806x/patches-3.18/156-dmaengine-Add-ADM-driver.patch b/target/linux/ipq806x/patches-3.18/156-dmaengine-Add-ADM-driver.patch
new file mode 100644
index 0000000..16d000e
--- /dev/null
+++ b/target/linux/ipq806x/patches-3.18/156-dmaengine-Add-ADM-driver.patch
@@ -0,0 +1,958 @@
+Content-Type: text/plain; charset="utf-8"
+MIME-Version: 1.0
+Content-Transfer-Encoding: 7bit
+Subject: [v6,2/2] dmaengine: Add ADM driver
+From: Andy Gross <agross@codeaurora.org>
+X-Patchwork-Id: 6027351
+Message-Id: <1426571172-9711-3-git-send-email-agross@codeaurora.org>
+To: Vinod Koul <vinod.koul@intel.com>
+Cc: devicetree@vger.kernel.org, dmaengine@vger.kernel.org,
+	linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org,
+	linux-arm-kernel@lists.infradead.org, Kumar Gala <galak@codeaurora.org>,
+	Bjorn Andersson <bjorn.andersson@sonymobile.com>,
+	Andy Gross <agross@codeaurora.org>
+Date: Tue, 17 Mar 2015 00:46:12 -0500
+
+Add the DMA engine driver for the QCOM Application Data Mover (ADM) DMA
+controller found in the MSM8x60 and IPQ/APQ8064 platforms.
+
+The ADM supports both memory to memory transactions and memory
+to/from peripheral device transactions.  The controller also provides flow
+control capabilities for transactions to/from peripheral devices.
+
+The initial release of this driver supports slave transfers to/from peripherals
+and also incorporates CRCI (client rate control interface) flow control.
+
+Signed-off-by: Andy Gross <agross@codeaurora.org>
+Reviewed-by: sricharan <sricharan@codeaurora.org>
+
+---
+drivers/dma/Kconfig    |   10 +
+ drivers/dma/Makefile   |    1 +
+ drivers/dma/qcom_adm.c |  900 ++++++++++++++++++++++++++++++++++++++++++++++++
+ 3 files changed, 911 insertions(+)
+ create mode 100644 drivers/dma/qcom_adm.c
+
+--- a/drivers/dma/Kconfig
++++ b/drivers/dma/Kconfig
+@@ -457,4 +457,14 @@ config QCOM_BAM_DMA
+ 	  Enable support for the QCOM BAM DMA controller.  This controller
+ 	  provides DMA capabilities for a variety of on-chip devices.
+ 
++config QCOM_ADM
++	tristate "Qualcomm ADM support"
++	depends on ARCH_QCOM || (COMPILE_TEST && OF && ARM)
++	select DMA_ENGINE
++	select DMA_VIRTUAL_CHANNELS
++	---help---
++	  Enable support for the Qualcomm ADM DMA controller.  This controller
++	  provides DMA capabilities for both general purpose and on-chip
++	  peripheral devices.
++
+ endif
+--- /dev/null
++++ b/drivers/dma/qcom_adm.c
+@@ -0,0 +1,896 @@
++/*
++ * Copyright (c) 2013-2015, The Linux Foundation. All rights reserved.
++ *
++ * This program is free software; you can redistribute it and/or modify
++ * it under the terms of the GNU General Public License version 2 and
++ * only version 2 as published by the Free Software Foundation.
++ *
++ * 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/kernel.h>
++#include <linux/io.h>
++#include <linux/init.h>
++#include <linux/slab.h>
++#include <linux/module.h>
++#include <linux/interrupt.h>
++#include <linux/dma-mapping.h>
++#include <linux/scatterlist.h>
++#include <linux/device.h>
++#include <linux/platform_device.h>
++#include <linux/of.h>
++#include <linux/of_address.h>
++#include <linux/of_irq.h>
++#include <linux/of_dma.h>
++#include <linux/reset.h>
++#include <linux/clk.h>
++#include <linux/dmaengine.h>
++
++#include "dmaengine.h"
++#include "virt-dma.h"
++
++/* ADM registers - calculated from channel number and security domain */
++#define ADM_CHAN_MULTI			0x4
++#define ADM_CI_MULTI			0x4
++#define ADM_CRCI_MULTI			0x4
++#define ADM_EE_MULTI			0x800
++#define ADM_CHAN_OFFS(chan)		(ADM_CHAN_MULTI * chan)
++#define ADM_EE_OFFS(ee)			(ADM_EE_MULTI * ee)
++#define ADM_CHAN_EE_OFFS(chan, ee)	(ADM_CHAN_OFFS(chan) + ADM_EE_OFFS(ee))
++#define ADM_CHAN_OFFS(chan)		(ADM_CHAN_MULTI * chan)
++#define ADM_CI_OFFS(ci)			(ADM_CHAN_OFF(ci))
++#define ADM_CH_CMD_PTR(chan, ee)	(ADM_CHAN_EE_OFFS(chan, ee))
++#define ADM_CH_RSLT(chan, ee)		(0x40 + ADM_CHAN_EE_OFFS(chan, ee))
++#define ADM_CH_FLUSH_STATE0(chan, ee)	(0x80 + ADM_CHAN_EE_OFFS(chan, ee))
++#define ADM_CH_STATUS_SD(chan, ee)	(0x200 + ADM_CHAN_EE_OFFS(chan, ee))
++#define ADM_CH_CONF(chan)		(0x240 + ADM_CHAN_OFFS(chan))
++#define ADM_CH_RSLT_CONF(chan, ee)	(0x300 + ADM_CHAN_EE_OFFS(chan, ee))
++#define ADM_SEC_DOMAIN_IRQ_STATUS(ee)	(0x380 + ADM_EE_OFFS(ee))
++#define ADM_CI_CONF(ci)			(0x390 + ci * ADM_CI_MULTI)
++#define ADM_GP_CTL			0x3d8
++#define ADM_CRCI_CTL(crci, ee)		(0x400 + crci * ADM_CRCI_MULTI + \
++						ADM_EE_OFFS(ee))
++
++/* channel status */
++#define ADM_CH_STATUS_VALID	BIT(1)
++
++/* channel result */
++#define ADM_CH_RSLT_VALID	BIT(31)
++#define ADM_CH_RSLT_ERR		BIT(3)
++#define ADM_CH_RSLT_FLUSH	BIT(2)
++#define ADM_CH_RSLT_TPD		BIT(1)
++
++/* channel conf */
++#define ADM_CH_CONF_SHADOW_EN		BIT(12)
++#define ADM_CH_CONF_MPU_DISABLE		BIT(11)
++#define ADM_CH_CONF_PERM_MPU_CONF	BIT(9)
++#define ADM_CH_CONF_FORCE_RSLT_EN	BIT(7)
++#define ADM_CH_CONF_SEC_DOMAIN(ee)	(((ee & 0x3) << 4) | ((ee & 0x4) << 11))
++
++/* channel result conf */
++#define ADM_CH_RSLT_CONF_FLUSH_EN	BIT(1)
++#define ADM_CH_RSLT_CONF_IRQ_EN		BIT(0)
++
++/* CRCI CTL */
++#define ADM_CRCI_CTL_MUX_SEL	BIT(18)
++#define ADM_CRCI_CTL_RST	BIT(17)
++
++/* CI configuration */
++#define ADM_CI_RANGE_END(x)	(x << 24)
++#define ADM_CI_RANGE_START(x)	(x << 16)
++#define ADM_CI_BURST_4_WORDS	BIT(2)
++#define ADM_CI_BURST_8_WORDS	BIT(3)
++
++/* GP CTL */
++#define ADM_GP_CTL_LP_EN	BIT(12)
++#define ADM_GP_CTL_LP_CNT(x)	(x << 8)
++
++/* Command pointer list entry */
++#define ADM_CPLE_LP		BIT(31)
++#define ADM_CPLE_CMD_PTR_LIST	BIT(29)
++
++/* Command list entry */
++#define ADM_CMD_LC		BIT(31)
++#define ADM_CMD_DST_CRCI(n)	(((n) & 0xf) << 7)
++#define ADM_CMD_SRC_CRCI(n)	(((n) & 0xf) << 3)
++
++#define ADM_CMD_TYPE_SINGLE	0x0
++#define ADM_CMD_TYPE_BOX	0x3
++
++#define ADM_CRCI_MUX_SEL	BIT(4)
++#define ADM_DESC_ALIGN		8
++#define ADM_MAX_XFER		(SZ_64K-1)
++#define ADM_MAX_ROWS		(SZ_64K-1)
++#define ADM_MAX_CHANNELS	16
++
++struct adm_desc_hw_box {
++	u32 cmd;
++	u32 src_addr;
++	u32 dst_addr;
++	u32 row_len;
++	u32 num_rows;
++	u32 row_offset;
++};
++
++struct adm_desc_hw_single {
++	u32 cmd;
++	u32 src_addr;
++	u32 dst_addr;
++	u32 len;
++};
++
++struct adm_async_desc {
++	struct virt_dma_desc vd;
++	struct adm_device *adev;
++
++	size_t length;
++	enum dma_transfer_direction dir;
++	dma_addr_t dma_addr;
++	size_t dma_len;
++
++	void *cpl;
++	dma_addr_t cp_addr;
++	u32 crci;
++	u32 mux;
++	u32 blk_size;
++};
++
++struct adm_chan {
++	struct virt_dma_chan vc;
++	struct adm_device *adev;
++
++	/* parsed from DT */
++	u32 id;			/* channel id */
++
++	struct adm_async_desc *curr_txd;
++	struct dma_slave_config slave;
++	struct list_head node;
++
++	int error;
++	int initialized;
++};
++
++static inline struct adm_chan *to_adm_chan(struct dma_chan *common)
++{
++	return container_of(common, struct adm_chan, vc.chan);
++}
++
++struct adm_device {
++	void __iomem *regs;
++	struct device *dev;
++	struct dma_device common;
++	struct device_dma_parameters dma_parms;
++	struct adm_chan *channels;
++
++	u32 ee;
++
++	struct clk *core_clk;
++	struct clk *iface_clk;
++
++	struct reset_control *clk_reset;
++	struct reset_control *c0_reset;
++	struct reset_control *c1_reset;
++	struct reset_control *c2_reset;
++	int irq;
++};
++
++/**
++ * adm_free_chan - Frees dma resources associated with the specific channel
++ *
++ * Free all allocated descriptors associated with this channel
++ *
++ */
++static void adm_free_chan(struct dma_chan *chan)
++{
++	/* free all queued descriptors */
++	vchan_free_chan_resources(to_virt_chan(chan));
++}
++
++/**
++ * adm_get_blksize - Get block size from burst value
++ *
++ */
++static int adm_get_blksize(unsigned int burst)
++{
++	int ret;
++
++	switch (burst) {
++	case 16:
++	case 32:
++	case 64:
++	case 128:
++		ret = ffs(burst>>4) - 1;
++		break;
++	case 192:
++		ret = 4;
++		break;
++	case 256:
++		ret = 5;
++		break;
++	default:
++		ret = -EINVAL;
++		break;
++	}
++
++	return ret;
++}
++
++/**
++ * adm_process_fc_descriptors - Process descriptors for flow controlled xfers
++ *
++ * @achan: ADM channel
++ * @desc: Descriptor memory pointer
++ * @sg: Scatterlist entry
++ * @crci: CRCI value
++ * @burst: Burst size of transaction
++ * @direction: DMA transfer direction
++ */
++static void *adm_process_fc_descriptors(struct adm_chan *achan,
++	void *desc, struct scatterlist *sg, u32 crci, u32 burst,
++	enum dma_transfer_direction direction)
++{
++	struct adm_desc_hw_box *box_desc = NULL;
++	struct adm_desc_hw_single *single_desc;
++	u32 remainder = sg_dma_len(sg);
++	u32 rows, row_offset, crci_cmd;
++	u32 mem_addr = sg_dma_address(sg);
++	u32 *incr_addr = &mem_addr;
++	u32 *src, *dst;
++
++	if (direction == DMA_DEV_TO_MEM) {
++		crci_cmd = ADM_CMD_SRC_CRCI(crci);
++		row_offset = burst;
++		src = &achan->slave.src_addr;
++		dst = &mem_addr;
++	} else {
++		crci_cmd = ADM_CMD_DST_CRCI(crci);
++		row_offset = burst << 16;
++		src = &mem_addr;
++		dst = &achan->slave.dst_addr;
++	}
++
++	while (remainder >= burst) {
++		box_desc = desc;
++		box_desc->cmd = ADM_CMD_TYPE_BOX | crci_cmd;
++		box_desc->row_offset = row_offset;
++		box_desc->src_addr = *src;
++		box_desc->dst_addr = *dst;
++
++		rows = remainder / burst;
++		rows = min_t(u32, rows, ADM_MAX_ROWS);
++		box_desc->num_rows = rows << 16 | rows;
++		box_desc->row_len = burst << 16 | burst;
++
++		*incr_addr += burst * rows;
++		remainder -= burst * rows;
++		desc += sizeof(*box_desc);
++	}
++
++	/* if leftover bytes, do one single descriptor */
++	if (remainder) {
++		single_desc = desc;
++		single_desc->cmd = ADM_CMD_TYPE_SINGLE | crci_cmd;
++		single_desc->len = remainder;
++		single_desc->src_addr = *src;
++		single_desc->dst_addr = *dst;
++		desc += sizeof(*single_desc);
++
++		if (sg_is_last(sg))
++			single_desc->cmd |= ADM_CMD_LC;
++	} else {
++		if (box_desc && sg_is_last(sg))
++			box_desc->cmd |= ADM_CMD_LC;
++	}
++
++	return desc;
++}
++
++/**
++ * adm_process_non_fc_descriptors - Process descriptors for non-fc xfers
++ *
++ * @achan: ADM channel
++ * @desc: Descriptor memory pointer
++ * @sg: Scatterlist entry
++ * @direction: DMA transfer direction
++ */
++static void *adm_process_non_fc_descriptors(struct adm_chan *achan,
++	void *desc, struct scatterlist *sg,
++	enum dma_transfer_direction direction)
++{
++	struct adm_desc_hw_single *single_desc;
++	u32 remainder = sg_dma_len(sg);
++	u32 mem_addr = sg_dma_address(sg);
++	u32 *incr_addr = &mem_addr;
++	u32 *src, *dst;
++
++	if (direction == DMA_DEV_TO_MEM) {
++		src = &achan->slave.src_addr;
++		dst = &mem_addr;
++	} else {
++		src = &mem_addr;
++		dst = &achan->slave.dst_addr;
++	}
++
++	do {
++		single_desc = desc;
++		single_desc->cmd = ADM_CMD_TYPE_SINGLE;
++		single_desc->src_addr = *src;
++		single_desc->dst_addr = *dst;
++		single_desc->len = (remainder > ADM_MAX_XFER) ?
++				ADM_MAX_XFER : remainder;
++
++		remainder -= single_desc->len;
++		*incr_addr += single_desc->len;
++		desc += sizeof(*single_desc);
++	} while (remainder);
++
++	/* set last command if this is the end of the whole transaction */
++	if (sg_is_last(sg))
++		single_desc->cmd |= ADM_CMD_LC;
++
++	return desc;
++}
++
++/**
++ * adm_prep_slave_sg - Prep slave sg transaction
++ *
++ * @chan: dma channel
++ * @sgl: scatter gather list
++ * @sg_len: length of sg
++ * @direction: DMA transfer direction
++ * @flags: DMA flags
++ * @context: transfer context (unused)
++ */
++static struct dma_async_tx_descriptor *adm_prep_slave_sg(struct dma_chan *chan,
++	struct scatterlist *sgl, unsigned int sg_len,
++	enum dma_transfer_direction direction, unsigned long flags,
++	void *context)
++{
++	struct adm_chan *achan = to_adm_chan(chan);
++	struct adm_device *adev = achan->adev;
++	struct adm_async_desc *async_desc;
++	struct scatterlist *sg;
++	u32 i, burst;
++	u32 single_count = 0, box_count = 0, crci = 0;
++	void *desc;
++	u32 *cple;
++	int blk_size = 0;
++
++	if (!is_slave_direction(direction)) {
++		dev_err(adev->dev, "invalid dma direction\n");
++		return NULL;
++	}
++
++	/*
++	 * get burst value from slave configuration
++	 */
++	burst = (direction == DMA_MEM_TO_DEV) ?
++		achan->slave.dst_maxburst :
++		achan->slave.src_maxburst;
++
++	/* if using flow control, validate burst and crci values */
++	if (achan->slave.device_fc) {
++
++		blk_size = adm_get_blksize(burst);
++		if (blk_size < 0) {
++			dev_err(adev->dev, "invalid burst value: %d\n",
++				burst);
++			return ERR_PTR(-EINVAL);
++		}
++
++		crci = achan->slave.slave_id & 0xf;
++		if (!crci || achan->slave.slave_id > 0x1f) {
++			dev_err(adev->dev, "invalid crci value\n");
++			return ERR_PTR(-EINVAL);
++		}
++	}
++
++	/* iterate through sgs and compute allocation size of structures */
++	for_each_sg(sgl, sg, sg_len, i) {
++		if (achan->slave.device_fc) {
++			box_count += DIV_ROUND_UP(sg_dma_len(sg) / burst,
++						  ADM_MAX_ROWS);
++			if (sg_dma_len(sg) % burst)
++				single_count++;
++		} else {
++			single_count += DIV_ROUND_UP(sg_dma_len(sg),
++						     ADM_MAX_XFER);
++		}
++	}
++
++	async_desc = kzalloc(sizeof(*async_desc), GFP_NOWAIT);
++	if (!async_desc)
++		return ERR_PTR(-ENOMEM);
++
++	if (crci)
++		async_desc->mux = achan->slave.slave_id & ADM_CRCI_MUX_SEL ?
++					ADM_CRCI_CTL_MUX_SEL : 0;
++	async_desc->crci = crci;
++	async_desc->blk_size = blk_size;
++	async_desc->dma_len = single_count * sizeof(struct adm_desc_hw_single) +
++				box_count * sizeof(struct adm_desc_hw_box) +
++				sizeof(*cple) + 2 * ADM_DESC_ALIGN;
++
++	async_desc->cpl = dma_alloc_writecombine(adev->dev, async_desc->dma_len,
++				&async_desc->dma_addr, GFP_NOWAIT);
++
++	if (!async_desc->cpl) {
++		kfree(async_desc);
++		return ERR_PTR(-ENOMEM);
++	}
++
++	async_desc->adev = adev;
++
++	/* both command list entry and descriptors must be 8 byte aligned */
++	cple = PTR_ALIGN(async_desc->cpl, ADM_DESC_ALIGN);
++	desc = PTR_ALIGN(cple + 1, ADM_DESC_ALIGN);
++
++	/* init cmd list */
++	*cple = ADM_CPLE_LP;
++	*cple |= (desc - async_desc->cpl + async_desc->dma_addr) >> 3;
++
++	for_each_sg(sgl, sg, sg_len, i) {
++		async_desc->length += sg_dma_len(sg);
++
++		if (achan->slave.device_fc)
++			desc = adm_process_fc_descriptors(achan, desc, sg, crci,
++							burst, direction);
++		else
++			desc = adm_process_non_fc_descriptors(achan, desc, sg,
++							   direction);
++	}
++
++	return vchan_tx_prep(&achan->vc, &async_desc->vd, flags);
++}
++
++/**
++ * adm_terminate_all - terminate all transactions on a channel
++ * @achan: adm dma channel
++ *
++ * Dequeues and frees all transactions, aborts current transaction
++ * No callbacks are done
++ *
++ */
++static int adm_terminate_all(struct dma_chan *chan)
++{
++	struct adm_chan *achan = to_adm_chan(chan);
++	struct adm_device *adev = achan->adev;
++	unsigned long flags;
++	LIST_HEAD(head);
++
++	spin_lock_irqsave(&achan->vc.lock, flags);
++	vchan_get_all_descriptors(&achan->vc, &head);
++
++	/* send flush command to terminate current transaction */
++	writel_relaxed(0x0,
++		adev->regs + ADM_CH_FLUSH_STATE0(achan->id, adev->ee));
++
++	spin_unlock_irqrestore(&achan->vc.lock, flags);
++
++	vchan_dma_desc_free_list(&achan->vc, &head);
++
++	return 0;
++}
++
++static int adm_slave_config(struct dma_chan *chan, struct dma_slave_config *cfg)
++{
++	struct adm_chan *achan = to_adm_chan(chan);
++	unsigned long flag;
++
++	spin_lock_irqsave(&achan->vc.lock, flag);
++	memcpy(&achan->slave, cfg, sizeof(struct dma_slave_config));
++	spin_unlock_irqrestore(&achan->vc.lock, flag);
++
++	return 0;
++}
++
++/**
++ * adm_start_dma - start next transaction
++ * @achan - ADM dma channel
++ */
++static void adm_start_dma(struct adm_chan *achan)
++{
++	struct virt_dma_desc *vd = vchan_next_desc(&achan->vc);
++	struct adm_device *adev = achan->adev;
++	struct adm_async_desc *async_desc;
++
++	lockdep_assert_held(&achan->vc.lock);
++
++	if (!vd)
++		return;
++
++	list_del(&vd->node);
++
++	/* write next command list out to the CMD FIFO */
++	async_desc = container_of(vd, struct adm_async_desc, vd);
++	achan->curr_txd = async_desc;
++
++	/* reset channel error */
++	achan->error = 0;
++
++	if (!achan->initialized) {
++		/* enable interrupts */
++		writel(ADM_CH_CONF_SHADOW_EN |
++		       ADM_CH_CONF_PERM_MPU_CONF |
++		       ADM_CH_CONF_MPU_DISABLE |
++		       ADM_CH_CONF_SEC_DOMAIN(adev->ee),
++		       adev->regs + ADM_CH_CONF(achan->id));
++
++		writel(ADM_CH_RSLT_CONF_IRQ_EN | ADM_CH_RSLT_CONF_FLUSH_EN,
++			adev->regs + ADM_CH_RSLT_CONF(achan->id, adev->ee));
++
++		achan->initialized = 1;
++	}
++
++	/* set the crci block size if this transaction requires CRCI */
++	if (async_desc->crci) {
++		writel(async_desc->mux | async_desc->blk_size,
++			adev->regs + ADM_CRCI_CTL(async_desc->crci, adev->ee));
++	}
++
++	/* make sure IRQ enable doesn't get reordered */
++	wmb();
++
++	/* write next command list out to the CMD FIFO */
++	writel(ALIGN(async_desc->dma_addr, ADM_DESC_ALIGN) >> 3,
++		adev->regs + ADM_CH_CMD_PTR(achan->id, adev->ee));
++}
++
++/**
++ * adm_dma_irq - irq handler for ADM controller
++ * @irq: IRQ of interrupt
++ * @data: callback data
++ *
++ * IRQ handler for the bam controller
++ */
++static irqreturn_t adm_dma_irq(int irq, void *data)
++{
++	struct adm_device *adev = data;
++	u32 srcs, i;
++	struct adm_async_desc *async_desc;
++	unsigned long flags;
++
++	srcs = readl_relaxed(adev->regs +
++			ADM_SEC_DOMAIN_IRQ_STATUS(adev->ee));
++
++	for (i = 0; i < ADM_MAX_CHANNELS; i++) {
++		struct adm_chan *achan = &adev->channels[i];
++		u32 status, result;
++
++		if (srcs & BIT(i)) {
++			status = readl_relaxed(adev->regs +
++				ADM_CH_STATUS_SD(i, adev->ee));
++
++			/* if no result present, skip */
++			if (!(status & ADM_CH_STATUS_VALID))
++				continue;
++
++			result = readl_relaxed(adev->regs +
++				ADM_CH_RSLT(i, adev->ee));
++
++			/* no valid results, skip */
++			if (!(result & ADM_CH_RSLT_VALID))
++				continue;
++
++			/* flag error if transaction was flushed or failed */
++			if (result & (ADM_CH_RSLT_ERR | ADM_CH_RSLT_FLUSH))
++				achan->error = 1;
++
++			spin_lock_irqsave(&achan->vc.lock, flags);
++			async_desc = achan->curr_txd;
++
++			achan->curr_txd = NULL;
++
++			if (async_desc) {
++				vchan_cookie_complete(&async_desc->vd);
++
++				/* kick off next DMA */
++				adm_start_dma(achan);
++			}
++
++			spin_unlock_irqrestore(&achan->vc.lock, flags);
++		}
++	}
++
++	return IRQ_HANDLED;
++}
++
++/**
++ * adm_tx_status - returns status of transaction
++ * @chan: dma channel
++ * @cookie: transaction cookie
++ * @txstate: DMA transaction state
++ *
++ * Return status of dma transaction
++ */
++static enum dma_status adm_tx_status(struct dma_chan *chan, dma_cookie_t cookie,
++	struct dma_tx_state *txstate)
++{
++	struct adm_chan *achan = to_adm_chan(chan);
++	struct virt_dma_desc *vd;
++	enum dma_status ret;
++	unsigned long flags;
++	size_t residue = 0;
++
++	ret = dma_cookie_status(chan, cookie, txstate);
++	if (ret == DMA_COMPLETE || !txstate)
++		return ret;
++
++	spin_lock_irqsave(&achan->vc.lock, flags);
++
++	vd = vchan_find_desc(&achan->vc, cookie);
++	if (vd)
++		residue = container_of(vd, struct adm_async_desc, vd)->length;
++
++	spin_unlock_irqrestore(&achan->vc.lock, flags);
++
++	/*
++	 * residue is either the full length if it is in the issued list, or 0
++	 * if it is in progress.  We have no reliable way of determining
++	 * anything inbetween
++	*/
++	dma_set_residue(txstate, residue);
++
++	if (achan->error)
++		return DMA_ERROR;
++
++	return ret;
++}
++
++/**
++ * adm_issue_pending - starts pending transactions
++ * @chan: dma channel
++ *
++ * Issues all pending transactions and starts DMA
++ */
++static void adm_issue_pending(struct dma_chan *chan)
++{
++	struct adm_chan *achan = to_adm_chan(chan);
++	unsigned long flags;
++
++	spin_lock_irqsave(&achan->vc.lock, flags);
++
++	if (vchan_issue_pending(&achan->vc) && !achan->curr_txd)
++		adm_start_dma(achan);
++	spin_unlock_irqrestore(&achan->vc.lock, flags);
++}
++
++/**
++ * adm_dma_free_desc - free descriptor memory
++ * @vd: virtual descriptor
++ *
++ */
++static void adm_dma_free_desc(struct virt_dma_desc *vd)
++{
++	struct adm_async_desc *async_desc = container_of(vd,
++			struct adm_async_desc, vd);
++
++	dma_free_writecombine(async_desc->adev->dev, async_desc->dma_len,
++		async_desc->cpl, async_desc->dma_addr);
++	kfree(async_desc);
++}
++
++static void adm_channel_init(struct adm_device *adev, struct adm_chan *achan,
++	u32 index)
++{
++	achan->id = index;
++	achan->adev = adev;
++
++	vchan_init(&achan->vc, &adev->common);
++	achan->vc.desc_free = adm_dma_free_desc;
++}
++
++static int adm_dma_probe(struct platform_device *pdev)
++{
++	struct adm_device *adev;
++	struct resource *iores;
++	int ret;
++	u32 i;
++
++	adev = devm_kzalloc(&pdev->dev, sizeof(*adev), GFP_KERNEL);
++	if (!adev)
++		return -ENOMEM;
++
++	adev->dev = &pdev->dev;
++
++	iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++	adev->regs = devm_ioremap_resource(&pdev->dev, iores);
++	if (IS_ERR(adev->regs))
++		return PTR_ERR(adev->regs);
++
++	adev->irq = platform_get_irq(pdev, 0);
++	if (adev->irq < 0)
++		return adev->irq;
++
++	ret = of_property_read_u32(pdev->dev.of_node, "qcom,ee", &adev->ee);
++	if (ret) {
++		dev_err(adev->dev, "Execution environment unspecified\n");
++		return ret;
++	}
++
++	adev->core_clk = devm_clk_get(adev->dev, "core");
++	if (IS_ERR(adev->core_clk))
++		return PTR_ERR(adev->core_clk);
++
++	ret = clk_prepare_enable(adev->core_clk);
++	if (ret) {
++		dev_err(adev->dev, "failed to prepare/enable core clock\n");
++		return ret;
++	}
++
++	adev->iface_clk = devm_clk_get(adev->dev, "iface");
++	if (IS_ERR(adev->iface_clk)) {
++		ret = PTR_ERR(adev->iface_clk);
++		goto err_disable_core_clk;
++	}
++
++	ret = clk_prepare_enable(adev->iface_clk);
++	if (ret) {
++		dev_err(adev->dev, "failed to prepare/enable iface clock\n");
++		goto err_disable_core_clk;
++	}
++
++	adev->clk_reset = devm_reset_control_get(&pdev->dev, "clk");
++	if (IS_ERR(adev->clk_reset)) {
++		dev_err(adev->dev, "failed to get ADM0 reset\n");
++		ret = PTR_ERR(adev->clk_reset);
++		goto err_disable_clks;
++	}
++
++	adev->c0_reset = devm_reset_control_get(&pdev->dev, "c0");
++	if (IS_ERR(adev->c0_reset)) {
++		dev_err(adev->dev, "failed to get ADM0 C0 reset\n");
++		ret = PTR_ERR(adev->c0_reset);
++		goto err_disable_clks;
++	}
++
++	adev->c1_reset = devm_reset_control_get(&pdev->dev, "c1");
++	if (IS_ERR(adev->c1_reset)) {
++		dev_err(adev->dev, "failed to get ADM0 C1 reset\n");
++		ret = PTR_ERR(adev->c1_reset);
++		goto err_disable_clks;
++	}
++
++	adev->c2_reset = devm_reset_control_get(&pdev->dev, "c2");
++	if (IS_ERR(adev->c2_reset)) {
++		dev_err(adev->dev, "failed to get ADM0 C2 reset\n");
++		ret = PTR_ERR(adev->c2_reset);
++		goto err_disable_clks;
++	}
++
++	reset_control_assert(adev->clk_reset);
++	reset_control_assert(adev->c0_reset);
++	reset_control_assert(adev->c1_reset);
++	reset_control_assert(adev->c2_reset);
++
++	reset_control_deassert(adev->clk_reset);
++	reset_control_deassert(adev->c0_reset);
++	reset_control_deassert(adev->c1_reset);
++	reset_control_deassert(adev->c2_reset);
++
++	adev->channels = devm_kcalloc(adev->dev, ADM_MAX_CHANNELS,
++				sizeof(*adev->channels), GFP_KERNEL);
++
++	if (!adev->channels) {
++		ret = -ENOMEM;
++		goto err_disable_clks;
++	}
++
++	/* allocate and initialize channels */
++	INIT_LIST_HEAD(&adev->common.channels);
++
++	for (i = 0; i < ADM_MAX_CHANNELS; i++)
++		adm_channel_init(adev, &adev->channels[i], i);
++
++	/* reset CRCIs */
++	for (i = 0; i < 16; i++)
++		writel(ADM_CRCI_CTL_RST, adev->regs +
++			ADM_CRCI_CTL(i, adev->ee));
++
++	/* configure client interfaces */
++	writel(ADM_CI_RANGE_START(0x40) | ADM_CI_RANGE_END(0xb0) |
++		ADM_CI_BURST_8_WORDS, adev->regs + ADM_CI_CONF(0));
++	writel(ADM_CI_RANGE_START(0x2a) | ADM_CI_RANGE_END(0x2c) |
++		ADM_CI_BURST_8_WORDS, adev->regs + ADM_CI_CONF(1));
++	writel(ADM_CI_RANGE_START(0x12) | ADM_CI_RANGE_END(0x28) |
++		ADM_CI_BURST_8_WORDS, adev->regs + ADM_CI_CONF(2));
++	writel(ADM_GP_CTL_LP_EN | ADM_GP_CTL_LP_CNT(0xf),
++		adev->regs + ADM_GP_CTL);
++
++	ret = devm_request_irq(adev->dev, adev->irq, adm_dma_irq,
++			0, "adm_dma", adev);
++	if (ret)
++		goto err_disable_clks;
++
++	platform_set_drvdata(pdev, adev);
++
++	adev->common.dev = adev->dev;
++	adev->common.dev->dma_parms = &adev->dma_parms;
++
++	/* set capabilities */
++	dma_cap_zero(adev->common.cap_mask);
++	dma_cap_set(DMA_SLAVE, adev->common.cap_mask);
++	dma_cap_set(DMA_PRIVATE, adev->common.cap_mask);
++
++	/* initialize dmaengine apis */
++	adev->common.device_free_chan_resources = adm_free_chan;
++	adev->common.device_prep_slave_sg = adm_prep_slave_sg;
++	adev->common.device_issue_pending = adm_issue_pending;
++	adev->common.device_tx_status = adm_tx_status;
++	adev->common.device_terminate_all = adm_terminate_all;
++	adev->common.device_config = adm_slave_config;
++
++	ret = dma_async_device_register(&adev->common);
++	if (ret) {
++		dev_err(adev->dev, "failed to register dma async device\n");
++		goto err_disable_clks;
++	}
++
++	ret = of_dma_controller_register(pdev->dev.of_node,
++					 of_dma_xlate_by_chan_id,
++					 &adev->common);
++	if (ret)
++		goto err_unregister_dma;
++
++	return 0;
++
++err_unregister_dma:
++	dma_async_device_unregister(&adev->common);
++err_disable_clks:
++	clk_disable_unprepare(adev->iface_clk);
++err_disable_core_clk:
++	clk_disable_unprepare(adev->core_clk);
++
++	return ret;
++}
++
++static int adm_dma_remove(struct platform_device *pdev)
++{
++	struct adm_device *adev = platform_get_drvdata(pdev);
++	struct adm_chan *achan;
++	u32 i;
++
++	of_dma_controller_free(pdev->dev.of_node);
++	dma_async_device_unregister(&adev->common);
++
++	for (i = 0; i < ADM_MAX_CHANNELS; i++) {
++		achan = &adev->channels[i];
++
++		/* mask IRQs for this channel/EE pair */
++		writel(0, adev->regs + ADM_CH_RSLT_CONF(achan->id, adev->ee));
++
++		adm_terminate_all(&adev->channels[i].vc.chan);
++	}
++
++	devm_free_irq(adev->dev, adev->irq, adev);
++
++	clk_disable_unprepare(adev->core_clk);
++	clk_disable_unprepare(adev->iface_clk);
++
++	return 0;
++}
++
++static const struct of_device_id adm_of_match[] = {
++	{ .compatible = "qcom,adm", },
++	{}
++};
++MODULE_DEVICE_TABLE(of, adm_of_match);
++
++static struct platform_driver adm_dma_driver = {
++	.probe = adm_dma_probe,
++	.remove = adm_dma_remove,
++	.driver = {
++		.name = "adm-dma-engine",
++		.of_match_table = adm_of_match,
++	},
++};
++
++module_platform_driver(adm_dma_driver);
++
++MODULE_AUTHOR("Andy Gross <agross@codeaurora.org>");
++MODULE_DESCRIPTION("QCOM ADM DMA engine driver");
++MODULE_LICENSE("GPL v2");
+--- a/drivers/dma/Makefile
++++ b/drivers/dma/Makefile
+@@ -49,3 +49,4 @@ obj-y += xilinx/
+ obj-$(CONFIG_INTEL_MIC_X100_DMA) += mic_x100_dma.o
+ obj-$(CONFIG_NBPFAXI_DMA) += nbpfaxi.o
+ obj-$(CONFIG_DMA_SUN6I) += sun6i-dma.o
++obj-$(CONFIG_QCOM_ADM) += qcom_adm.o