RE: [Patch v6 2/2] dmaengine: Add ADM driver
From: Sricharan
Date: Fri Mar 20 2015 - 02:48:01 EST
Hi,
> -----Original Message-----
> From: linux-arm-kernel [mailto:linux-arm-kernel-
> bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Andy Gross
> Sent: Tuesday, March 17, 2015 11:16 AM
> To: Vinod Koul
> Cc: devicetree@xxxxxxxxxxxxxxx; linux-arm-msm@xxxxxxxxxxxxxxx; Andy
> Gross; linux-kernel@xxxxxxxxxxxxxxx; Bjorn Andersson; Kumar Gala;
> dmaengine@xxxxxxxxxxxxxxx; linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
> Subject: [Patch v6 2/2] dmaengine: Add ADM driver
>
> 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@xxxxxxxxxxxxxx>
> ---
> 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
>
> diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig index
> a874b6e..6919013 100644
> --- a/drivers/dma/Kconfig
> +++ b/drivers/dma/Kconfig
> @@ -473,4 +473,14 @@ 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
> diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile index
> f915f61..7f0fbe6 100644
> --- a/drivers/dma/Makefile
> +++ b/drivers/dma/Makefile
> @@ -51,3 +51,4 @@ 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_IMG_MDC_DMA) += img-mdc-dma.o
> +obj-$(CONFIG_QCOM_ADM) += qcom_adm.o
> diff --git a/drivers/dma/qcom_adm.c b/drivers/dma/qcom_adm.c new file
> mode 100644 index 0000000..7f8c119
> --- /dev/null
> +++ b/drivers/dma/qcom_adm.c
> @@ -0,0 +1,900 @@
> +/*
> + * 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;
> + 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;
> + }
> +
> + do {
> + 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);
> + } while (remainder >= burst);
> +
> + /* 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 (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.directions = BIT(DMA_DEV_TO_MEM |
> DMA_MEM_TO_DEV);
> + adev->common.residue_granularity =
> DMA_RESIDUE_GRANULARITY_DESCRIPTOR;
> + adev->common.src_addr_widths =
> DMA_SLAVE_BUSWIDTH_4_BYTES;
> + adev->common.dst_addr_widths =
> DMA_SLAVE_BUSWIDTH_4_BYTES;
> + 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@xxxxxxxxxxxxxx>");
> +MODULE_DESCRIPTION("QCOM ADM DMA engine driver");
> MODULE_LICENSE("GPL
> +v2");
Reviewed-by: sricharan <sricharan@xxxxxxxxxxxxxx>
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