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Subject[Patch v3 2/2] dmaengine: Add ADM driver
Date
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>
---
drivers/dma/Kconfig | 10 +
drivers/dma/Makefile | 1 +
drivers/dma/qcom_adm.c | 902 ++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 913 insertions(+)
create mode 100644 drivers/dma/qcom_adm.c

diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index f2b2c4e..69bc15e 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -464,4 +464,14 @@ 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 2022b54..3b7ead6 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -50,3 +50,4 @@ 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
diff --git a/drivers/dma/qcom_adm.c b/drivers/dma/qcom_adm.c
new file mode 100644
index 0000000..7381c38
--- /dev/null
+++ b/drivers/dma/qcom_adm.c
@@ -0,0 +1,902 @@
+/*
+ * Copyright (c) 2013-2014, 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 HI_CH_CMD_PTR(chan, ee) (4*chan + 0x20800*ee)
+#define HI_CH_RSLT(chan, ee) (0x40 + 4*chan + 0x20800*ee)
+#define HI_CH_FLUSH_STATE0(chan, ee) (0x80 + 4*chan + 0x20800*ee)
+#define HI_CH_FLUSH_STATE1(chan, ee) (0xc0 + 4*chan + 0x20800*ee)
+#define HI_CH_FLUSH_STATE2(chan, ee) (0x100 + 4*chan + 0x20800*ee)
+#define HI_CH_FLUSH_STATE3(chan, ee) (0x140 + 4*chan + 0x20800*ee)
+#define HI_CH_FLUSH_STATE4(chan, ee) (0x180 + 4*chan + 0x20800*ee)
+#define HI_CH_FLUSH_STATE5(chan, ee) (0x1c0 + 4*chan + 0x20800*ee)
+#define HI_CH_STATUS_SD(chan, ee) (0x200 + 4*chan + 0x20800*ee)
+#define HI_CH_CONF(chan) (0x240 + 4*chan)
+#define HI_CH_RSLT_CONF(chan, ee) (0x300 + 4*chan + 0x20800*ee)
+#define HI_SEC_DOMAIN_IRQ_STATUS(ee) (0x380 + 0x20800*ee)
+#define HI_CI_CONF(ci) (0x390 + 4*ci)
+#define HI_CRCI_CONF0 0x3d0
+#define HI_CRCI_CONF1 0x3d4
+#define HI_GP_CTL 0x3d8
+#define HI_CRCI_CTL(crci, ee) (0x400 + 0x4*crci + 0x20800*ee)
+
+/* channel status */
+#define CH_STATUS_VALID BIT(1)
+
+/* channel result */
+#define CH_RSLT_VALID BIT(31)
+#define CH_RSLT_ERR BIT(3)
+#define CH_RSLT_FLUSH BIT(2)
+#define CH_RSLT_TPD BIT(1)
+
+/* channel conf */
+#define CH_CONF_MPU_DISABLE BIT(11)
+#define CH_CONF_PERM_MPU_CONF BIT(9)
+#define CH_CONF_FLUSH_RSLT_EN BIT(8)
+#define CH_CONF_FORCE_RSLT_EN BIT(7)
+#define CH_CONF_IRQ_EN BIT(6)
+
+/* channel result conf */
+#define CH_RSLT_CONF_FLUSH_EN BIT(1)
+#define CH_RSLT_CONF_IRQ_EN BIT(0)
+
+/* CRCI CTL */
+#define CRCI_CTL_MUX_SEL BIT(18)
+#define CRCI_CTL_RST BIT(17)
+
+/* CI configuration */
+#define CI_RANGE_END(x) (x << 24)
+#define CI_RANGE_START(x) (x << 16)
+#define CI_BURST_4_WORDS 0x4
+#define CI_BURST_8_WORDS 0x8
+
+/* GP CTL */
+#define GP_CTL_LP_EN BIT(12)
+#define GP_CTL_LP_CNT(x) (x << 8)
+
+/* Command pointer list entry */
+#define CPLE_LP BIT(31)
+#define CPLE_CMD_PTR_LIST BIT(29)
+
+/* Command list entry */
+#define CMD_LC BIT(31)
+#define CMD_DST_CRCI(n) (((n) & 0xf) << 7)
+#define CMD_SRC_CRCI(n) (((n) & 0xf) << 3)
+
+#define CMD_TYPE_SINGLE 0x0
+#define CMD_TYPE_BOX 0x3
+
+#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_alloc_chan - Allocates channel resources for DMA channel
+ *
+ * This function is effectively a stub, as we don't need to setup any resources
+ */
+static int adm_alloc_chan(struct dma_chan *chan)
+{
+ return 0;
+}
+
+/**
+ * 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:
+ ret = 0;
+ break;
+ case 32:
+ ret = 1;
+ break;
+ case 64:
+ ret = 2;
+ break;
+ case 128:
+ ret = 3;
+ break;
+ case 192:
+ ret = 4;
+ break;
+ case 256:
+ ret = 5;
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+/**
+ * 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;
+ u32 single_count = 0, box_count = 0, desc_offset = 0, crci = 0;
+ struct adm_desc_hw_box *box_desc;
+ struct adm_desc_hw_single *single_desc;
+ void *desc;
+ u32 *cple, *last_cmd;
+ u32 burst;
+ 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
+ * If zero, default to maximum burst size
+ * If larger than the max transfer size, set to ADM_MAX_XFER
+ */
+ burst = (direction == DMA_MEM_TO_DEV) ?
+ achan->slave.dst_maxburst :
+ achan->slave.src_maxburst;
+
+ if (!burst || burst > ADM_MAX_XFER)
+ burst = ADM_MAX_XFER;
+
+ /* 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 w/ crci: %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 (sg_dma_len(sg) % burst)
+ single_count += DIV_ROUND_UP(sg_dma_len(sg), burst);
+ else
+ box_count += DIV_ROUND_UP(sg_dma_len(sg) / burst,
+ ADM_MAX_ROWS);
+
+ async_desc = kzalloc(sizeof(*async_desc), GFP_NOWAIT);
+ if (!async_desc)
+ return ERR_PTR(-ENOMEM);
+
+ if (crci)
+ async_desc->mux = achan->slave.slave_id >> 4 ?
+ CRCI_CTL_MUX_SEL : 0;
+ async_desc->crci = crci;
+ async_desc->blk_size = blk_size;
+ async_desc->dma_len = single_count * sizeof(*single_desc) +
+ box_count * sizeof(*box_desc) + 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);
+ last_cmd = desc;
+
+ /* init cmd list */
+ *cple = CPLE_LP;
+ *cple |= (desc - async_desc->cpl + async_desc->dma_addr) >> 3;
+
+ for_each_sg(sgl, sg, sg_len, i) {
+ unsigned int xfer_len, row_len, rows;
+ unsigned int remainder = sg_dma_len(sg);
+ unsigned int offset = 0;
+
+ do {
+ /* use single if length is not multiple of burst */
+ if (remainder % burst) {
+ single_desc = desc + desc_offset;
+ last_cmd = &single_desc->cmd;
+ single_desc->cmd = CMD_TYPE_SINGLE;
+ xfer_len = (remainder > ADM_MAX_XFER) ?
+ ADM_MAX_XFER : remainder;
+ if (direction == DMA_DEV_TO_MEM) {
+ single_desc->dst_addr =
+ sg_dma_address(sg) + offset;
+ single_desc->src_addr =
+ achan->slave.src_addr;
+ single_desc->len = xfer_len;
+ single_desc->cmd |= CMD_SRC_CRCI(crci);
+ } else {
+ single_desc->src_addr =
+ sg_dma_address(sg) + offset;
+ single_desc->dst_addr =
+ achan->slave.dst_addr;
+ single_desc->len = xfer_len;
+ single_desc->cmd |= CMD_DST_CRCI(crci);
+ }
+
+ remainder -= xfer_len;
+ async_desc->length += xfer_len;
+ offset += xfer_len;
+ desc_offset += sizeof(*single_desc);
+ } else {
+ box_desc = desc + desc_offset;
+ last_cmd = &box_desc->cmd;
+ box_desc->cmd = CMD_TYPE_BOX;
+ box_desc->row_offset = 0;
+
+ if (direction == DMA_DEV_TO_MEM) {
+ box_desc->dst_addr =
+ sg_dma_address(sg) + offset;
+ box_desc->src_addr =
+ achan->slave.src_addr;
+ box_desc->cmd |= CMD_SRC_CRCI(crci);
+ box_desc->row_offset = burst;
+
+ } else {
+ box_desc->src_addr =
+ sg_dma_address(sg) + offset;
+ box_desc->dst_addr =
+ achan->slave.dst_addr;
+ box_desc->cmd |= CMD_DST_CRCI(crci);
+ box_desc->row_offset = burst << 16;
+ }
+
+ desc_offset += sizeof(*box_desc);
+ rows = remainder / burst;
+ rows = min_t(u32, rows, ADM_MAX_ROWS);
+ row_len = burst;
+ box_desc->num_rows = rows << 16 | rows;
+ box_desc->row_len = row_len << 16 | row_len;
+
+ remainder -= row_len * rows;
+ async_desc->length += row_len * rows;
+ offset += row_len * rows;
+ }
+ } while (remainder > 0);
+ }
+
+ /* set last command flag */
+ *last_cmd |= CMD_LC;
+
+ 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 void adm_terminate_all(struct adm_chan *achan)
+{
+ struct adm_device *adev = achan->adev;
+ unsigned long flags;
+ LIST_HEAD(head);
+
+ /* send flush command to terminate current transaction */
+ writel_relaxed(0x0,
+ adev->regs + HI_CH_FLUSH_STATE0(achan->id, adev->ee));
+
+ spin_lock_irqsave(&achan->vc.lock, flags);
+ vchan_get_all_descriptors(&achan->vc, &head);
+ spin_unlock_irqrestore(&achan->vc.lock, flags);
+
+ vchan_dma_desc_free_list(&achan->vc, &head);
+}
+
+/**
+ * adm_control - DMA device control
+ * @chan: dma channel
+ * @cmd: control cmd
+ * @arg: cmd argument
+ *
+ * Perform DMA control command
+ *
+ */
+static int adm_control(struct dma_chan *chan, enum dma_ctrl_cmd cmd,
+ unsigned long arg)
+{
+ struct adm_chan *achan = to_adm_chan(chan);
+ unsigned long flag;
+ int ret = 0;
+
+ switch (cmd) {
+ case DMA_SLAVE_CONFIG:
+ spin_lock_irqsave(&achan->vc.lock, flag);
+ memcpy(&achan->slave, (void *)arg,
+ sizeof(struct dma_slave_config));
+ spin_unlock_irqrestore(&achan->vc.lock, flag);
+ break;
+
+ case DMA_TERMINATE_ALL:
+ adm_terminate_all(achan);
+ break;
+
+ default:
+ ret = -ENXIO;
+ break;
+ };
+
+ return ret;
+}
+
+/**
+ * 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(CH_CONF_IRQ_EN | CH_CONF_FLUSH_RSLT_EN |
+ CH_CONF_FORCE_RSLT_EN | CH_CONF_PERM_MPU_CONF |
+ CH_CONF_MPU_DISABLE,
+ adev->regs + HI_CH_CONF(achan->id));
+
+ writel(CH_RSLT_CONF_IRQ_EN | CH_RSLT_CONF_FLUSH_EN,
+ adev->regs + HI_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 + HI_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 + HI_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 +
+ HI_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 +
+ HI_CH_STATUS_SD(i, adev->ee));
+
+ /* if no result present, skip */
+ if (!(status & CH_STATUS_VALID))
+ continue;
+
+ result = readl_relaxed(adev->regs +
+ HI_CH_RSLT(i, adev->ee));
+
+ /* no valid results, skip */
+ if (!(result & CH_RSLT_VALID))
+ continue;
+
+ /* flag error if transaction was flushed or failed */
+ if (result & (CH_RSLT_ERR | 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;
+}
+
+static struct dma_chan *adm_dma_xlate(struct of_phandle_args *dma_spec,
+ struct of_dma *of)
+{
+ struct adm_device *adev = container_of(of->of_dma_data,
+ struct adm_device, common);
+ struct dma_chan *chan;
+ unsigned int request;
+
+ if (dma_spec->args_count != 1) {
+ dev_err(adev->dev, "incorrect number of dma arguments\n");
+ return NULL;
+ }
+
+ request = dma_spec->args[0];
+ if (request >= ADM_MAX_CHANNELS)
+ return NULL;
+
+ chan = dma_get_slave_channel(&(adev->channels[request].vc.chan));
+
+ if (!chan)
+ return NULL;
+
+ return chan;
+}
+
+/**
+ * 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(CRCI_CTL_RST, adev->regs + HI_CRCI_CTL(i, adev->ee));
+
+ /* configure client interfaces */
+ writel(CI_RANGE_START(0x40) | CI_RANGE_END(0xb0) | CI_BURST_8_WORDS,
+ adev->regs + HI_CI_CONF(0));
+ writel(CI_RANGE_START(0x2a) | CI_RANGE_END(0x2c) | CI_BURST_8_WORDS,
+ adev->regs + HI_CI_CONF(1));
+ writel(CI_RANGE_START(0x12) | CI_RANGE_END(0x28) | CI_BURST_8_WORDS,
+ adev->regs + HI_CI_CONF(2));
+ writel(GP_CTL_LP_EN | GP_CTL_LP_CNT(0xf), adev->regs + HI_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_alloc_chan_resources = adm_alloc_chan;
+ adev->common.device_free_chan_resources = adm_free_chan;
+ adev->common.device_prep_slave_sg = adm_prep_slave_sg;
+ adev->common.device_control = adm_control;
+ adev->common.device_issue_pending = adm_issue_pending;
+ adev->common.device_tx_status = adm_tx_status;
+
+ 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, adm_dma_xlate,
+ &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);
+
+ devm_free_irq(adev->dev, adev->irq, adev);
+
+ for (i = 0; i < ADM_MAX_CHANNELS; i++) {
+ achan = &adev->channels[i];
+ writel(CH_CONF_FLUSH_RSLT_EN,
+ adev->regs + HI_CH_CONF(achan->id));
+ writel(CH_RSLT_CONF_FLUSH_EN,
+ adev->regs + HI_CH_RSLT_CONF(achan->id, adev->ee));
+
+ adm_terminate_all(&adev->channels[i]);
+ }
+
+ 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",
+ .owner = THIS_MODULE,
+ .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");
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation


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