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Message-Id: <1446174501-8870-2-git-send-email-okaya@codeaurora.org>
Date: Thu, 29 Oct 2015 23:08:13 -0400
From: Sinan Kaya <okaya@...eaurora.org>
To: dmaengine@...r.kernel.org, timur@...eaurora.org,
cov@...eaurora.org, jcm@...hat.com
Cc: Sinan Kaya <okaya@...eaurora.org>,
Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
Vinod Koul <vinod.koul@...el.com>,
Dan Williams <dan.j.williams@...el.com>,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] dma: add Qualcomm Technologies HIDMA channel driver
This patch adds support for hidma engine. The driver
consists of two logical blocks. The DMA engine interface
and the low-level interface. This version of the driver
does not support virtualization on this release and only
memcpy interface support is included.
Signed-off-by: Sinan Kaya <okaya@...eaurora.org>
---
.../devicetree/bindings/dma/qcom_hidma.txt | 18 +
drivers/dma/Kconfig | 11 +
drivers/dma/Makefile | 4 +
drivers/dma/qcom_hidma.c | 1717 ++++++++++++++++++++
drivers/dma/qcom_hidma.h | 44 +
drivers/dma/qcom_hidma_ll.c | 1132 +++++++++++++
6 files changed, 2926 insertions(+)
create mode 100644 Documentation/devicetree/bindings/dma/qcom_hidma.txt
create mode 100644 drivers/dma/qcom_hidma.c
create mode 100644 drivers/dma/qcom_hidma.h
create mode 100644 drivers/dma/qcom_hidma_ll.c
diff --git a/Documentation/devicetree/bindings/dma/qcom_hidma.txt b/Documentation/devicetree/bindings/dma/qcom_hidma.txt
new file mode 100644
index 0000000..9a01635
--- /dev/null
+++ b/Documentation/devicetree/bindings/dma/qcom_hidma.txt
@@ -0,0 +1,18 @@
+Qualcomm Technologies HIDMA Channel driver
+
+Required properties:
+- compatible: must contain "qcom,hidma"
+- reg: Addresses for the transfer and event channel
+- interrupts: Should contain the event interrupt
+- desc-count: Number of asynchronous requests this channel can handle
+- event-channel: The HW event channel completions will be delivered.
+Example:
+
+ hidma_24: hidma@...c050000 {
+ compatible = "qcom,hidma";
+ reg = <0 0x5c050000 0x0 0x1000>,
+ <0 0x5c0b0000 0x0 0x1000>;
+ interrupts = <0 389 0>;
+ desc-count = <10>;
+ event-channel = /bits/ 8 <4>;
+ };
diff --git a/drivers/dma/Kconfig b/drivers/dma/Kconfig
index 76a5a5e..2645185 100644
--- a/drivers/dma/Kconfig
+++ b/drivers/dma/Kconfig
@@ -512,6 +512,17 @@ config QCOM_HIDMA_MGMT
OS would run QCOM_HIDMA driver and the hypervisor would run
the QCOM_HIDMA_MGMT driver.
+config QCOM_HIDMA
+ tristate "Qualcomm Technologies HIDMA support"
+ select DMA_ENGINE
+ select DMA_VIRTUAL_CHANNELS
+ help
+ Enable support for the Qualcomm Technologies HIDMA controller.
+ The HIDMA controller supports optimized buffer copies
+ (user to kernel, kernel to kernel, etc.). It only supports
+ memcpy/memset interfaces. The core is not intended for general
+ purpose slave DMA.
+
config XILINX_VDMA
tristate "Xilinx AXI VDMA Engine"
depends on (ARCH_ZYNQ || MICROBLAZE)
diff --git a/drivers/dma/Makefile b/drivers/dma/Makefile
index 3d25ffd..5665df2 100644
--- a/drivers/dma/Makefile
+++ b/drivers/dma/Makefile
@@ -53,6 +53,10 @@ obj-$(CONFIG_PL330_DMA) += pl330.o
obj-$(CONFIG_PPC_BESTCOMM) += bestcomm/
obj-$(CONFIG_PXA_DMA) += pxa_dma.o
obj-$(CONFIG_QCOM_BAM_DMA) += qcom_bam_dma.o
+obj-$(CONFIG_QCOM_HIDMA) += qcom_hdma.o
+qcom_hdma-objs := qcom_hidma_ll.o qcom_hidma.o
+
+
obj-$(CONFIG_QCOM_HIDMA_MGMT) += qcom_hidma_mgmt.o
obj-$(CONFIG_RENESAS_DMA) += sh/
obj-$(CONFIG_SIRF_DMA) += sirf-dma.o
diff --git a/drivers/dma/qcom_hidma.c b/drivers/dma/qcom_hidma.c
new file mode 100644
index 0000000..2a92305
--- /dev/null
+++ b/drivers/dma/qcom_hidma.c
@@ -0,0 +1,1717 @@
+/*
+ * Qualcomm Technologies HIDMA DMA engine interface
+ *
+ * Copyright (c) 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.
+ */
+
+/*
+ * Copyright (C) Freescale Semicondutor, Inc. 2007, 2008.
+ * Copyright (C) Semihalf 2009
+ * Copyright (C) Ilya Yanok, Emcraft Systems 2010
+ * Copyright (C) Alexander Popov, Promcontroller 2014
+ *
+ * Written by Piotr Ziecik <kosmo@...ihalf.com>. Hardware description
+ * (defines, structures and comments) was taken from MPC5121 DMA driver
+ * written by Hongjun Chen <hong-jun.chen@...escale.com>.
+ *
+ * Approved as OSADL project by a majority of OSADL members and funded
+ * by OSADL membership fees in 2009; for details see www.osadl.org.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * The full GNU General Public License is included in this distribution in the
+ * file called COPYING.
+ */
+
+/* Linux Foundation elects GPLv2 license only.
+ */
+
+#include <linux/dmaengine.h>
+#include <linux/dma-mapping.h>
+#include <asm/dma.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_dma.h>
+#include <linux/property.h>
+#include <linux/delay.h>
+#include <linux/highmem.h>
+#include <linux/io.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include <linux/acpi.h>
+#include <linux/irq.h>
+#include <linux/debugfs.h>
+#include <linux/atomic.h>
+#include <linux/pm_runtime.h>
+#include "dmaengine.h"
+#include "qcom_hidma.h"
+
+/* Default idle time is 2 seconds. This parameter can
+ * be overridden by changing the following
+ * /sys/bus/platform/devices/QCOM8061:<xy>/power/autosuspend_delay_ms
+ * during kernel boot.
+ */
+#define AUTOSUSPEND_TIMEOUT 2000
+#define HIDMA_DEFAULT_DESCRIPTOR_COUNT 16
+#define MODULE_NAME "hidma"
+
+#define HIDMA_RUNTIME_GET(dmadev) \
+do { \
+ atomic_inc(&(dmadev)->pm_counter); \
+ TRC_PM((dmadev)->ddev.dev, \
+ "%s:%d pm_runtime_get %d\n", __func__, __LINE__,\
+ atomic_read(&(dmadev)->pm_counter)); \
+ pm_runtime_get_sync((dmadev)->ddev.dev); \
+} while (0)
+
+#define HIDMA_RUNTIME_SET(dmadev) \
+do { \
+ atomic_dec(&(dmadev)->pm_counter); \
+ TRC_PM((dmadev)->ddev.dev, \
+ "%s:%d pm_runtime_put_autosuspend:%d\n", \
+ __func__, __LINE__, \
+ atomic_read(&(dmadev)->pm_counter)); \
+ pm_runtime_mark_last_busy((dmadev)->ddev.dev); \
+ pm_runtime_put_autosuspend((dmadev)->ddev.dev); \
+} while (0)
+
+struct hidma_test_sync {
+ atomic_t counter;
+ wait_queue_head_t wq;
+};
+
+struct hidma_dev {
+ u8 evridx;
+ u32 nr_descriptors;
+
+ void *lldev;
+ void __iomem *dev_trca;
+ void __iomem *dev_evca;
+ int (*self_test)(struct hidma_dev *device);
+ struct dentry *debugfs;
+ struct dentry *stats;
+
+ /* used to protect the pending channel list*/
+ spinlock_t lock;
+ dma_addr_t dev_trca_phys;
+ struct dma_device ddev;
+ struct tasklet_struct tasklet;
+
+ resource_size_t dev_trca_size;
+ dma_addr_t dev_evca_phys;
+ resource_size_t dev_evca_size;
+
+ struct hidma_test_sync test_result;
+ atomic_t pm_counter;
+};
+
+struct hidma_chan {
+ bool paused;
+ bool allocated;
+ char name[16];
+ u32 dma_sig;
+
+ /*
+ * active descriptor on this channel
+ * It is used by the DMA complete notification to
+ * locate the descriptor that initiated the transfer.
+ */
+ struct dentry *debugfs;
+ struct dentry *stats;
+ struct hidma_dev *dmadev;
+
+ struct dma_chan chan;
+ struct list_head free;
+ struct list_head prepared;
+ struct list_head active;
+ struct list_head completed;
+
+ /* Lock for this structure */
+ spinlock_t lock;
+};
+
+struct hidma_desc {
+ struct dma_async_tx_descriptor desc;
+ /* link list node for this channel*/
+ struct list_head node;
+ u32 tre_ch;
+};
+
+static inline
+struct hidma_dev *to_hidma_dev(struct dma_device *dmadev)
+{
+ return container_of(dmadev, struct hidma_dev, ddev);
+}
+
+static inline
+struct hidma_dev *to_hidma_dev_from_lldev(void *_lldev)
+{
+ return container_of(_lldev, struct hidma_dev, lldev);
+}
+
+static inline
+struct hidma_chan *to_hidma_chan(struct dma_chan *dmach)
+{
+ return container_of(dmach, struct hidma_chan, chan);
+}
+
+static inline struct hidma_desc *
+to_hidma_desc(struct dma_async_tx_descriptor *t)
+{
+ return container_of(t, struct hidma_desc, desc);
+}
+
+static void hidma_free(struct hidma_dev *dmadev)
+{
+ dev_dbg(dmadev->ddev.dev, "free dmadev\n");
+ INIT_LIST_HEAD(&dmadev->ddev.channels);
+}
+
+static unsigned int debug_pm;
+module_param(debug_pm, uint, 0644);
+MODULE_PARM_DESC(debug_pm,
+ "debug runtime power management transitions (default: 0)");
+
+#define TRC_PM(...) do { \
+ if (debug_pm) \
+ dev_info(__VA_ARGS__); \
+ } while (0)
+
+/* process completed descriptors */
+static void hidma_process_completed(struct hidma_dev *mdma)
+{
+ dma_cookie_t last_cookie = 0;
+ struct hidma_chan *mchan;
+ struct hidma_desc *mdesc;
+ struct dma_async_tx_descriptor *desc;
+ unsigned long irqflags;
+ LIST_HEAD(list);
+ struct dma_chan *dmach = NULL;
+
+ list_for_each_entry(dmach, &mdma->ddev.channels,
+ device_node) {
+ mchan = to_hidma_chan(dmach);
+
+ /* Get all completed descriptors */
+ spin_lock_irqsave(&mchan->lock, irqflags);
+ if (!list_empty(&mchan->completed))
+ list_splice_tail_init(&mchan->completed, &list);
+ spin_unlock_irqrestore(&mchan->lock, irqflags);
+
+ if (list_empty(&list))
+ continue;
+
+ /* Execute callbacks and run dependencies */
+ list_for_each_entry(mdesc, &list, node) {
+ desc = &mdesc->desc;
+
+ spin_lock_irqsave(&mchan->lock, irqflags);
+ dma_cookie_complete(desc);
+ spin_unlock_irqrestore(&mchan->lock, irqflags);
+
+ if (desc->callback &&
+ (hidma_ll_status(mdma->lldev, mdesc->tre_ch)
+ == DMA_COMPLETE))
+ desc->callback(desc->callback_param);
+
+ last_cookie = desc->cookie;
+ dma_run_dependencies(desc);
+ }
+
+ /* Free descriptors */
+ spin_lock_irqsave(&mchan->lock, irqflags);
+ list_splice_tail_init(&list, &mchan->free);
+ spin_unlock_irqrestore(&mchan->lock, irqflags);
+ }
+}
+
+/*
+ * Execute all queued DMA descriptors.
+ * This function is called either on the first transfer attempt in tx_submit
+ * or from the callback routine when one transfer is finished. It can only be
+ * called from a single location since both of places check active list to be
+ * empty and will immediately fill the active list while lock is held.
+ *
+ * Following requirements must be met while calling hidma_execute():
+ * a) mchan->lock is locked,
+ * b) mchan->active list contains multiple entries.
+ * c) pm protected
+ */
+static int hidma_execute(struct hidma_chan *mchan)
+{
+ struct hidma_dev *mdma = mchan->dmadev;
+ int rc;
+
+ if (!hidma_ll_isenabled(mdma->lldev))
+ return -ENODEV;
+
+ /* Start the transfer */
+ if (!list_empty(&mchan->active))
+ rc = hidma_ll_start(mdma->lldev);
+
+ return 0;
+}
+
+/*
+ * Called once for each submitted descriptor.
+ * PM is locked once for each descriptor that is currently
+ * in execution.
+ */
+static void hidma_callback(void *data)
+{
+ struct hidma_desc *mdesc = data;
+ struct hidma_chan *mchan = to_hidma_chan(mdesc->desc.chan);
+ unsigned long irqflags;
+ struct dma_device *ddev = mchan->chan.device;
+ struct hidma_dev *dmadev = to_hidma_dev(ddev);
+ bool queued = false;
+
+ dev_dbg(dmadev->ddev.dev, "callback: data:0x%p\n", data);
+
+ spin_lock_irqsave(&mchan->lock, irqflags);
+
+ if (mdesc->node.next) {
+ /* Delete from the active list, add to completed list */
+ list_move_tail(&mdesc->node, &mchan->completed);
+ queued = true;
+ }
+ spin_unlock_irqrestore(&mchan->lock, irqflags);
+
+ hidma_process_completed(dmadev);
+
+ if (queued)
+ HIDMA_RUNTIME_SET(dmadev);
+}
+
+static int hidma_chan_init(struct hidma_dev *dmadev, u32 dma_sig)
+{
+ struct hidma_chan *mchan;
+ struct dma_device *ddev;
+
+ mchan = devm_kzalloc(dmadev->ddev.dev, sizeof(*mchan), GFP_KERNEL);
+ if (!mchan) {
+ dev_err(dmadev->ddev.dev, "chaninit: out of memory\n");
+ return -ENOMEM;
+ }
+
+ ddev = &dmadev->ddev;
+ mchan->dma_sig = dma_sig;
+ mchan->dmadev = dmadev;
+ mchan->chan.device = ddev;
+ dma_cookie_init(&mchan->chan);
+
+ INIT_LIST_HEAD(&mchan->free);
+ INIT_LIST_HEAD(&mchan->prepared);
+ INIT_LIST_HEAD(&mchan->active);
+ INIT_LIST_HEAD(&mchan->completed);
+
+ spin_lock_init(&mchan->lock);
+ list_add_tail(&mchan->chan.device_node, &ddev->channels);
+ dmadev->ddev.chancnt++;
+ return 0;
+}
+
+static void hidma_issue_pending(struct dma_chan *dmach)
+{
+}
+
+static enum dma_status hidma_tx_status(struct dma_chan *dmach,
+ dma_cookie_t cookie,
+ struct dma_tx_state *txstate)
+{
+ enum dma_status ret;
+ unsigned long irqflags;
+ struct hidma_chan *mchan = to_hidma_chan(dmach);
+
+ spin_lock_irqsave(&mchan->lock, irqflags);
+ if (mchan->paused)
+ ret = DMA_PAUSED;
+ else
+ ret = dma_cookie_status(dmach, cookie, txstate);
+ spin_unlock_irqrestore(&mchan->lock, irqflags);
+
+ return ret;
+}
+
+/*
+ * Submit descriptor to hardware.
+ * Lock the PM for each descriptor we are sending.
+ */
+static dma_cookie_t hidma_tx_submit(struct dma_async_tx_descriptor *txd)
+{
+ struct hidma_chan *mchan = to_hidma_chan(txd->chan);
+ struct hidma_dev *dmadev = mchan->dmadev;
+ struct hidma_desc *mdesc;
+ unsigned long irqflags;
+ dma_cookie_t cookie;
+
+ if (!hidma_ll_isenabled(dmadev->lldev))
+ return -ENODEV;
+
+ HIDMA_RUNTIME_GET(dmadev);
+ mdesc = container_of(txd, struct hidma_desc, desc);
+ spin_lock_irqsave(&mchan->lock, irqflags);
+
+ /* Move descriptor to active */
+ list_move_tail(&mdesc->node, &mchan->active);
+
+ /* Update cookie */
+ cookie = dma_cookie_assign(txd);
+
+ hidma_ll_queue_request(dmadev->lldev, mdesc->tre_ch);
+ hidma_execute(mchan);
+
+ spin_unlock_irqrestore(&mchan->lock, irqflags);
+
+ return cookie;
+}
+
+static int hidma_alloc_chan_resources(struct dma_chan *dmach)
+{
+ struct hidma_chan *mchan = to_hidma_chan(dmach);
+ struct hidma_dev *dmadev = mchan->dmadev;
+ int rc = 0;
+ struct hidma_desc *mdesc, *tmp;
+ unsigned long irqflags;
+ LIST_HEAD(descs);
+ u32 i;
+
+ if (mchan->allocated)
+ return 0;
+
+ /* Alloc descriptors for this channel */
+ for (i = 0; i < dmadev->nr_descriptors; i++) {
+ mdesc = kzalloc(sizeof(struct hidma_desc), GFP_KERNEL);
+ if (!mdesc) {
+ dev_err(dmadev->ddev.dev, "Memory allocation error. ");
+ rc = -ENOMEM;
+ break;
+ }
+ dma_async_tx_descriptor_init(&mdesc->desc, dmach);
+ mdesc->desc.flags = DMA_CTRL_ACK;
+ mdesc->desc.tx_submit = hidma_tx_submit;
+
+ rc = hidma_ll_request(dmadev->lldev,
+ mchan->dma_sig, "DMA engine", hidma_callback,
+ mdesc, &mdesc->tre_ch);
+ if (rc != 1) {
+ dev_err(dmach->device->dev,
+ "channel alloc failed at %u\n", i);
+ kfree(mdesc);
+ break;
+ }
+ list_add_tail(&mdesc->node, &descs);
+ }
+
+ if (rc != 1) {
+ /* return the allocated descriptors */
+ list_for_each_entry_safe(mdesc, tmp, &descs, node) {
+ hidma_ll_free(dmadev->lldev, mdesc->tre_ch);
+ kfree(mdesc);
+ }
+ return rc;
+ }
+
+ spin_lock_irqsave(&mchan->lock, irqflags);
+ list_splice_tail_init(&descs, &mchan->free);
+ mchan->allocated = true;
+ spin_unlock_irqrestore(&mchan->lock, irqflags);
+ dev_dbg(dmadev->ddev.dev,
+ "allocated channel for %u\n", mchan->dma_sig);
+ return rc;
+}
+
+static void hidma_free_chan_resources(struct dma_chan *dmach)
+{
+ struct hidma_chan *mchan = to_hidma_chan(dmach);
+ struct hidma_dev *mdma = mchan->dmadev;
+ struct hidma_desc *mdesc, *tmp;
+ unsigned long irqflags;
+ LIST_HEAD(descs);
+
+ if (!list_empty(&mchan->prepared) ||
+ !list_empty(&mchan->active) ||
+ !list_empty(&mchan->completed)) {
+ /* We have unfinished requests waiting.
+ * Terminate the request from the hardware.
+ */
+ hidma_cleanup_pending_tre(mdma->lldev, 0x77, 0x77);
+
+ /* Give enough time for completions to be called. */
+ msleep(100);
+ }
+
+ spin_lock_irqsave(&mchan->lock, irqflags);
+ /* Channel must be idle */
+ BUG_ON(!list_empty(&mchan->prepared));
+ BUG_ON(!list_empty(&mchan->active));
+ BUG_ON(!list_empty(&mchan->completed));
+
+ /* Move data */
+ list_splice_tail_init(&mchan->free, &descs);
+
+ /* Free descriptors */
+ list_for_each_entry_safe(mdesc, tmp, &descs, node) {
+ hidma_ll_free(mdma->lldev, mdesc->tre_ch);
+ list_del(&mdesc->node);
+ kfree(mdesc);
+ }
+
+ mchan->allocated = 0;
+ spin_unlock_irqrestore(&mchan->lock, irqflags);
+ dev_dbg(mdma->ddev.dev, "freed channel for %u\n", mchan->dma_sig);
+}
+
+
+static struct dma_async_tx_descriptor *
+hidma_prep_dma_memcpy(struct dma_chan *dmach, dma_addr_t dma_dest,
+ dma_addr_t dma_src, size_t len, unsigned long flags)
+{
+ struct hidma_chan *mchan = to_hidma_chan(dmach);
+ struct hidma_desc *mdesc = NULL;
+ struct hidma_dev *mdma = mchan->dmadev;
+ unsigned long irqflags;
+
+ dev_dbg(mdma->ddev.dev,
+ "memcpy: chan:%p dest:%pad src:%pad len:%zu\n", mchan,
+ &dma_dest, &dma_src, len);
+
+ /* Get free descriptor */
+ spin_lock_irqsave(&mchan->lock, irqflags);
+ if (!list_empty(&mchan->free)) {
+ mdesc = list_first_entry(&mchan->free, struct hidma_desc, node);
+ list_del(&mdesc->node);
+ }
+ spin_unlock_irqrestore(&mchan->lock, irqflags);
+
+ if (!mdesc)
+ return NULL;
+
+ hidma_ll_set_transfer_params(mdma->lldev, mdesc->tre_ch,
+ dma_src, dma_dest, len, flags);
+
+ /* Place descriptor in prepared list */
+ spin_lock_irqsave(&mchan->lock, irqflags);
+ list_add_tail(&mdesc->node, &mchan->prepared);
+ spin_unlock_irqrestore(&mchan->lock, irqflags);
+
+ return &mdesc->desc;
+}
+
+static int hidma_terminate_all(struct dma_chan *chan)
+{
+ struct hidma_dev *dmadev;
+ LIST_HEAD(head);
+ unsigned long irqflags;
+ LIST_HEAD(list);
+ struct hidma_desc *tmp, *mdesc = NULL;
+ int rc = 0;
+ struct hidma_chan *mchan;
+
+ mchan = to_hidma_chan(chan);
+ dmadev = to_hidma_dev(mchan->chan.device);
+ dev_dbg(dmadev->ddev.dev, "terminateall: chan:0x%p\n", mchan);
+
+ HIDMA_RUNTIME_GET(dmadev);
+ /* give completed requests a chance to finish */
+ hidma_process_completed(dmadev);
+
+ spin_lock_irqsave(&mchan->lock, irqflags);
+ list_splice_init(&mchan->active, &list);
+ list_splice_init(&mchan->prepared, &list);
+ list_splice_init(&mchan->completed, &list);
+ spin_unlock_irqrestore(&mchan->lock, irqflags);
+
+ /* this suspends the existing transfer */
+ rc = hidma_ll_pause(dmadev->lldev);
+ if (rc) {
+ dev_err(dmadev->ddev.dev, "channel did not pause\n");
+ goto out;
+ }
+
+ /* return all user requests */
+ list_for_each_entry_safe(mdesc, tmp, &list, node) {
+ struct dma_async_tx_descriptor *txd = &mdesc->desc;
+ dma_async_tx_callback callback = mdesc->desc.callback;
+ void *param = mdesc->desc.callback_param;
+ enum dma_status status;
+
+ dma_descriptor_unmap(txd);
+
+ status = hidma_ll_status(dmadev->lldev, mdesc->tre_ch);
+ /*
+ * The API requires that no submissions are done from a
+ * callback, so we don't need to drop the lock here
+ */
+ if (callback && (status == DMA_COMPLETE))
+ callback(param);
+
+ dma_run_dependencies(txd);
+
+ /* move myself to free_list */
+ list_move(&mdesc->node, &mchan->free);
+ }
+
+ /* reinitialize the hardware */
+ rc = hidma_ll_setup(dmadev->lldev);
+
+out:
+ HIDMA_RUNTIME_SET(dmadev);
+ return rc;
+}
+
+static int hidma_pause(struct dma_chan *chan)
+{
+ struct hidma_chan *mchan;
+ struct hidma_dev *dmadev;
+
+ mchan = to_hidma_chan(chan);
+ dmadev = to_hidma_dev(mchan->chan.device);
+ dev_dbg(dmadev->ddev.dev, "pause: chan:0x%p\n", mchan);
+
+ HIDMA_RUNTIME_GET(dmadev);
+ if (!mchan->paused) {
+ if (hidma_ll_pause(dmadev->lldev))
+ dev_warn(dmadev->ddev.dev, "channel did not stop\n");
+ mchan->paused = true;
+ }
+ HIDMA_RUNTIME_SET(dmadev);
+ return 0;
+}
+
+static int hidma_resume(struct dma_chan *chan)
+{
+ struct hidma_chan *mchan;
+ struct hidma_dev *dmadev;
+ int rc = 0;
+
+ mchan = to_hidma_chan(chan);
+ dmadev = to_hidma_dev(mchan->chan.device);
+ dev_dbg(dmadev->ddev.dev, "resume: chan:0x%p\n", mchan);
+
+ HIDMA_RUNTIME_GET(dmadev);
+ if (mchan->paused) {
+ rc = hidma_ll_resume(dmadev->lldev);
+ if (!rc)
+ mchan->paused = false;
+ else
+ dev_err(dmadev->ddev.dev,
+ "failed to resume the channel");
+ }
+ HIDMA_RUNTIME_SET(dmadev);
+ return rc;
+}
+
+static void hidma_selftest_complete(void *arg)
+{
+ struct hidma_dev *dmadev = arg;
+
+ atomic_inc(&dmadev->test_result.counter);
+ wake_up_interruptible(&dmadev->test_result.wq);
+ dev_dbg(dmadev->ddev.dev, "self test transfer complete :%d\n",
+ atomic_read(&dmadev->test_result.counter));
+}
+
+/*
+ * Perform a transaction to verify the HW works.
+ */
+static int hidma_selftest_sg(struct hidma_dev *dmadev,
+ struct dma_chan *dma_chanptr, u64 size,
+ unsigned long flags)
+{
+ dma_addr_t src_dma, dest_dma, dest_dma_it;
+ u8 *dest_buf;
+ u32 i, j = 0;
+ dma_cookie_t cookie;
+ struct dma_async_tx_descriptor *tx;
+ int err = 0;
+ int ret;
+ struct hidma_chan *hidma_chan;
+ struct sg_table sg_table;
+ struct scatterlist *sg;
+ int nents = 10, count;
+ bool free_channel = 1;
+ u8 *src_buf;
+ int map_count;
+
+ atomic_set(&dmadev->test_result.counter, 0);
+
+ if (!dma_chanptr)
+ return -ENOMEM;
+
+ if (hidma_alloc_chan_resources(dma_chanptr) < 1)
+ return -ENODEV;
+
+ if (!dma_chanptr->device || !dmadev->ddev.dev) {
+ hidma_free_chan_resources(dma_chanptr);
+ return -ENODEV;
+ }
+
+ ret = sg_alloc_table(&sg_table, nents, GFP_KERNEL);
+ if (ret) {
+ err = ret;
+ goto sg_table_alloc_failed;
+ }
+
+ for_each_sg(sg_table.sgl, sg, nents, i) {
+ int alloc_sz = round_up(size, nents) / nents;
+ void *cpu_addr = kmalloc(alloc_sz, GFP_KERNEL);
+
+ if (!cpu_addr) {
+ err = -ENOMEM;
+ goto sg_buf_alloc_failed;
+ }
+
+ dev_dbg(dmadev->ddev.dev, "set sg buf[%d] :%p\n", i, cpu_addr);
+ sg_set_buf(sg, cpu_addr, alloc_sz);
+ }
+
+ dest_buf = kmalloc(round_up(size, nents), GFP_KERNEL);
+ if (!dest_buf) {
+ err = -ENOMEM;
+ goto dst_alloc_failed;
+ }
+ dev_dbg(dmadev->ddev.dev, "dest:%p\n", dest_buf);
+
+ /* Fill in src buffer */
+ count = 0;
+ for_each_sg(sg_table.sgl, sg, nents, i) {
+ src_buf = sg_virt(sg);
+ dev_dbg(dmadev->ddev.dev,
+ "set src[%d, %d, %p] = %d\n", i, j, src_buf, count);
+
+ for (j = 0; j < sg_dma_len(sg); j++)
+ src_buf[j] = count++;
+ }
+
+ /* dma_map_sg cleans and invalidates the cache in arm64 when
+ * DMA_TO_DEVICE is selected for src. That's why, we need to do
+ * the mapping after the data is copied.
+ */
+ map_count = dma_map_sg(dmadev->ddev.dev, sg_table.sgl, nents,
+ DMA_TO_DEVICE);
+ if (!map_count) {
+ err = -EINVAL;
+ goto src_map_failed;
+ }
+
+ dest_dma = dma_map_single(dmadev->ddev.dev, dest_buf,
+ size, DMA_FROM_DEVICE);
+
+ err = dma_mapping_error(dmadev->ddev.dev, dest_dma);
+ if (err)
+ goto dest_map_failed;
+
+ /* check scatter gather list contents */
+ for_each_sg(sg_table.sgl, sg, map_count, i)
+ dev_dbg(dmadev->ddev.dev,
+ "[%d/%d] src va=%p, iova = %pa len:%d\n",
+ i, map_count, sg_virt(sg), &sg_dma_address(sg),
+ sg_dma_len(sg));
+
+ dest_dma_it = dest_dma;
+ for_each_sg(sg_table.sgl, sg, map_count, i) {
+ src_buf = sg_virt(sg);
+ src_dma = sg_dma_address(sg);
+ dev_dbg(dmadev->ddev.dev, "src_dma: %pad dest_dma:%pad\n",
+ &src_dma, &dest_dma_it);
+
+ tx = hidma_prep_dma_memcpy(dma_chanptr, dest_dma_it, src_dma,
+ sg_dma_len(sg), flags);
+ if (!tx) {
+ dev_err(dmadev->ddev.dev,
+ "Self-test prep_dma_memcpy failed, disabling\n");
+ err = -ENODEV;
+ goto prep_memcpy_failed;
+ }
+
+ tx->callback_param = dmadev;
+ tx->callback = hidma_selftest_complete;
+ cookie = tx->tx_submit(tx);
+ dest_dma_it += sg_dma_len(sg);
+ }
+
+ hidma_issue_pending(dma_chanptr);
+
+ /*
+ * It is assumed that the hardware can move the data within 1s
+ * and signal the OS of the completion
+ */
+ ret = wait_event_interruptible_timeout(dmadev->test_result.wq,
+ atomic_read(&dmadev->test_result.counter) == (map_count),
+ msecs_to_jiffies(10000));
+
+ if (ret <= 0) {
+ dev_err(dmadev->ddev.dev,
+ "Self-test sg copy timed out, disabling\n");
+ err = -ENODEV;
+ goto tx_status;
+ }
+ dev_dbg(dmadev->ddev.dev,
+ "Self-test complete signal received\n");
+
+ if (hidma_tx_status(dma_chanptr, cookie, NULL) !=
+ DMA_COMPLETE) {
+ dev_err(dmadev->ddev.dev,
+ "Self-test sg status not complete, disabling\n");
+ err = -ENODEV;
+ goto tx_status;
+ }
+
+ dma_sync_single_for_cpu(dmadev->ddev.dev, dest_dma, size,
+ DMA_FROM_DEVICE);
+
+ hidma_chan = to_hidma_chan(dma_chanptr);
+ count = 0;
+ for_each_sg(sg_table.sgl, sg, map_count, i) {
+ src_buf = sg_virt(sg);
+ if (memcmp(src_buf, &dest_buf[count], sg_dma_len(sg)) == 0) {
+ count += sg_dma_len(sg);
+ continue;
+ }
+
+ for (j = 0; j < sg_dma_len(sg); j++) {
+ if (src_buf[j] != dest_buf[count]) {
+ dev_dbg(dmadev->ddev.dev,
+ "[%d, %d] (%p) src :%x dest (%p):%x cnt:%d\n",
+ i, j, &src_buf[j], src_buf[j],
+ &dest_buf[count], dest_buf[count],
+ count);
+ dev_err(dmadev->ddev.dev,
+ "Self-test copy failed compare, disabling\n");
+ err = -EFAULT;
+ return err;
+ goto compare_failed;
+ }
+ count++;
+ }
+ }
+
+ /*
+ * do not release the channel
+ * we want to consume all the channels on self test
+ */
+ free_channel = 0;
+
+compare_failed:
+tx_status:
+prep_memcpy_failed:
+ dma_unmap_single(dmadev->ddev.dev, dest_dma, size,
+ DMA_FROM_DEVICE);
+dest_map_failed:
+ dma_unmap_sg(dmadev->ddev.dev, sg_table.sgl, nents,
+ DMA_TO_DEVICE);
+
+src_map_failed:
+ kfree(dest_buf);
+
+dst_alloc_failed:
+sg_buf_alloc_failed:
+ for_each_sg(sg_table.sgl, sg, nents, i) {
+ if (sg_virt(sg))
+ kfree(sg_virt(sg));
+ }
+ sg_free_table(&sg_table);
+sg_table_alloc_failed:
+ if (free_channel)
+ hidma_free_chan_resources(dma_chanptr);
+
+ return err;
+}
+
+/*
+ * Perform a streaming transaction to verify the HW works.
+ */
+static int hidma_selftest_streaming(struct hidma_dev *dmadev,
+ struct dma_chan *dma_chanptr, u64 size,
+ unsigned long flags)
+{
+ dma_addr_t src_dma, dest_dma;
+ u8 *dest_buf, *src_buf;
+ u32 i;
+ dma_cookie_t cookie;
+ struct dma_async_tx_descriptor *tx;
+ int err = 0;
+ int ret;
+ struct hidma_chan *hidma_chan;
+ bool free_channel = 1;
+
+ atomic_set(&dmadev->test_result.counter, 0);
+
+ if (!dma_chanptr)
+ return -ENOMEM;
+
+ if (hidma_alloc_chan_resources(dma_chanptr) < 1)
+ return -ENODEV;
+
+ if (!dma_chanptr->device || !dmadev->ddev.dev) {
+ hidma_free_chan_resources(dma_chanptr);
+ return -ENODEV;
+ }
+
+ src_buf = kmalloc(size, GFP_KERNEL);
+ if (!src_buf) {
+ err = -ENOMEM;
+ goto src_alloc_failed;
+ }
+
+ dest_buf = kmalloc(size, GFP_KERNEL);
+ if (!dest_buf) {
+ err = -ENOMEM;
+ goto dst_alloc_failed;
+ }
+
+ dev_dbg(dmadev->ddev.dev, "src: %p dest:%p\n", src_buf, dest_buf);
+
+ /* Fill in src buffer */
+ for (i = 0; i < size; i++)
+ src_buf[i] = (u8)i;
+
+ /* dma_map_single cleans and invalidates the cache in arm64 when
+ * DMA_TO_DEVICE is selected for src. That's why, we need to do
+ * the mapping after the data is copied.
+ */
+ src_dma = dma_map_single(dmadev->ddev.dev, src_buf,
+ size, DMA_TO_DEVICE);
+
+ err = dma_mapping_error(dmadev->ddev.dev, src_dma);
+ if (err)
+ goto src_map_failed;
+
+ dest_dma = dma_map_single(dmadev->ddev.dev, dest_buf,
+ size, DMA_FROM_DEVICE);
+
+ err = dma_mapping_error(dmadev->ddev.dev, dest_dma);
+ if (err)
+ goto dest_map_failed;
+ dev_dbg(dmadev->ddev.dev, "src_dma: %pad dest_dma:%pad\n", &src_dma,
+ &dest_dma);
+ tx = hidma_prep_dma_memcpy(dma_chanptr, dest_dma, src_dma,
+ size,
+ flags);
+ if (!tx) {
+ dev_err(dmadev->ddev.dev,
+ "Self-test prep_dma_memcpy failed, disabling\n");
+ err = -ENODEV;
+ goto prep_memcpy_failed;
+ }
+
+ tx->callback_param = dmadev;
+ tx->callback = hidma_selftest_complete;
+ cookie = tx->tx_submit(tx);
+ hidma_issue_pending(dma_chanptr);
+
+ /*
+ * It is assumed that the hardware can move the data within 1s
+ * and signal the OS of the completion
+ */
+ ret = wait_event_interruptible_timeout(dmadev->test_result.wq,
+ atomic_read(&dmadev->test_result.counter) == 1,
+ msecs_to_jiffies(10000));
+
+ if (ret <= 0) {
+ dev_err(dmadev->ddev.dev,
+ "Self-test copy timed out, disabling\n");
+ err = -ENODEV;
+ goto tx_status;
+ }
+ dev_dbg(dmadev->ddev.dev, "Self-test complete signal received\n");
+
+ if (hidma_tx_status(dma_chanptr, cookie, NULL) !=
+ DMA_COMPLETE) {
+ dev_err(dmadev->ddev.dev,
+ "Self-test copy timed out, disabling\n");
+ err = -ENODEV;
+ goto tx_status;
+ }
+
+ dma_sync_single_for_cpu(dmadev->ddev.dev, dest_dma, size,
+ DMA_FROM_DEVICE);
+
+ hidma_chan = to_hidma_chan(dma_chanptr);
+ if (memcmp(src_buf, dest_buf, size)) {
+ for (i = 0; i < size/4; i++) {
+ if (((u32 *)src_buf)[i] != ((u32 *)(dest_buf))[i]) {
+ dev_dbg(dmadev->ddev.dev,
+ "[%d] src data:%x dest data:%x\n",
+ i, ((u32 *)src_buf)[i],
+ ((u32 *)(dest_buf))[i]);
+ break;
+ }
+ }
+ dev_err(dmadev->ddev.dev,
+ "Self-test copy failed compare, disabling\n");
+ err = -EFAULT;
+ goto compare_failed;
+ }
+
+ /*
+ * do not release the channel
+ * we want to consume all the channels on self test
+ */
+ free_channel = 0;
+
+compare_failed:
+tx_status:
+prep_memcpy_failed:
+ dma_unmap_single(dmadev->ddev.dev, dest_dma, size,
+ DMA_FROM_DEVICE);
+dest_map_failed:
+ dma_unmap_single(dmadev->ddev.dev, src_dma, size,
+ DMA_TO_DEVICE);
+
+src_map_failed:
+ kfree(dest_buf);
+
+dst_alloc_failed:
+ kfree(src_buf);
+
+src_alloc_failed:
+ if (free_channel)
+ hidma_free_chan_resources(dma_chanptr);
+
+ return err;
+}
+
+/*
+ * Perform a coherent transaction to verify the HW works.
+ */
+static int hidma_selftest_one_coherent(struct hidma_dev *dmadev,
+ struct dma_chan *dma_chanptr, u64 size,
+ unsigned long flags)
+{
+ dma_addr_t src_dma, dest_dma;
+ u8 *dest_buf, *src_buf;
+ u32 i;
+ dma_cookie_t cookie;
+ struct dma_async_tx_descriptor *tx;
+ int err = 0;
+ int ret;
+ struct hidma_chan *hidma_chan;
+ bool free_channel = true;
+
+ atomic_set(&dmadev->test_result.counter, 0);
+
+ if (!dma_chanptr)
+ return -ENOMEM;
+
+ if (hidma_alloc_chan_resources(dma_chanptr) < 1)
+ return -ENODEV;
+
+ if (!dma_chanptr->device || !dmadev->ddev.dev) {
+ hidma_free_chan_resources(dma_chanptr);
+ return -ENODEV;
+ }
+
+ src_buf = dma_alloc_coherent(dmadev->ddev.dev, size,
+ &src_dma, GFP_KERNEL);
+ if (!src_buf) {
+ err = -ENOMEM;
+ goto src_alloc_failed;
+ }
+
+ dest_buf = dma_alloc_coherent(dmadev->ddev.dev, size,
+ &dest_dma, GFP_KERNEL);
+ if (!dest_buf) {
+ err = -ENOMEM;
+ goto dst_alloc_failed;
+ }
+
+ dev_dbg(dmadev->ddev.dev, "src: %p dest:%p\n", src_buf, dest_buf);
+
+ /* Fill in src buffer */
+ for (i = 0; i < size; i++)
+ src_buf[i] = (u8)i;
+
+ dev_dbg(dmadev->ddev.dev, "src_dma: %pad dest_dma:%pad\n", &src_dma,
+ &dest_dma);
+ tx = hidma_prep_dma_memcpy(dma_chanptr, dest_dma, src_dma,
+ size,
+ flags);
+ if (!tx) {
+ dev_err(dmadev->ddev.dev,
+ "Self-test prep_dma_memcpy failed, disabling\n");
+ err = -ENODEV;
+ goto prep_memcpy_failed;
+ }
+
+ tx->callback_param = dmadev;
+ tx->callback = hidma_selftest_complete;
+ cookie = tx->tx_submit(tx);
+ hidma_issue_pending(dma_chanptr);
+
+ /*
+ * It is assumed that the hardware can move the data within 1s
+ * and signal the OS of the completion
+ */
+ ret = wait_event_interruptible_timeout(dmadev->test_result.wq,
+ atomic_read(&dmadev->test_result.counter) == 1,
+ msecs_to_jiffies(10000));
+
+ if (ret <= 0) {
+ dev_err(dmadev->ddev.dev,
+ "Self-test copy timed out, disabling\n");
+ err = -ENODEV;
+ goto tx_status;
+ }
+ dev_dbg(dmadev->ddev.dev, "Self-test complete signal received\n");
+
+ if (hidma_tx_status(dma_chanptr, cookie, NULL) !=
+ DMA_COMPLETE) {
+ dev_err(dmadev->ddev.dev,
+ "Self-test copy timed out, disabling\n");
+ err = -ENODEV;
+ goto tx_status;
+ }
+
+ hidma_chan = to_hidma_chan(dma_chanptr);
+ if (memcmp(src_buf, dest_buf, size)) {
+ for (i = 0; i < size/4; i++) {
+ if (((u32 *)src_buf)[i] != ((u32 *)(dest_buf))[i]) {
+ dev_dbg(dmadev->ddev.dev,
+ "[%d] src data:%x dest data:%x\n",
+ i, ((u32 *)src_buf)[i],
+ ((u32 *)(dest_buf))[i]);
+ break;
+ }
+ }
+ dev_err(dmadev->ddev.dev,
+ "Self-test copy failed compare, disabling\n");
+ err = -EFAULT;
+ goto compare_failed;
+ }
+
+ /*
+ * do not release the channel
+ * we want to consume all the channels on self test
+ */
+ free_channel = 0;
+
+compare_failed:
+tx_status:
+prep_memcpy_failed:
+ dma_free_coherent(dmadev->ddev.dev, size, dest_buf, dest_dma);
+
+dst_alloc_failed:
+ dma_free_coherent(dmadev->ddev.dev, size, src_buf, src_dma);
+
+src_alloc_failed:
+ if (free_channel)
+ hidma_free_chan_resources(dma_chanptr);
+
+ return err;
+}
+
+static int hidma_selftest_all(struct hidma_dev *dmadev,
+ bool req_coherent, bool req_sg)
+{
+ int rc = -ENODEV, i = 0;
+ struct dma_chan **dmach_ptr = NULL;
+ u32 max_channels = 0;
+ u64 sizes[] = {PAGE_SIZE - 1, PAGE_SIZE, PAGE_SIZE + 1, 2801, 13295};
+ int count = 0;
+ u32 j;
+ u64 size;
+ int failed = 0;
+ struct dma_chan *dmach = NULL;
+
+ list_for_each_entry(dmach, &dmadev->ddev.channels,
+ device_node) {
+ max_channels++;
+ }
+
+ dmach_ptr = kcalloc(max_channels, sizeof(*dmach_ptr), GFP_KERNEL);
+ if (!dmach_ptr) {
+ rc = -ENOMEM;
+ goto failed_exit;
+ }
+
+ for (j = 0; j < sizeof(sizes)/sizeof(sizes[0]); j++) {
+ size = sizes[j];
+ count = 0;
+ dev_dbg(dmadev->ddev.dev, "test start for size:%llx\n", size);
+ list_for_each_entry(dmach, &dmadev->ddev.channels,
+ device_node) {
+ dmach_ptr[count] = dmach;
+ if (req_coherent)
+ rc = hidma_selftest_one_coherent(dmadev,
+ dmach, size,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ else if (req_sg)
+ rc = hidma_selftest_sg(dmadev,
+ dmach, size,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ else
+ rc = hidma_selftest_streaming(dmadev,
+ dmach, size,
+ DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+ if (rc) {
+ failed = 1;
+ break;
+ }
+ dev_dbg(dmadev->ddev.dev,
+ "self test passed for ch:%d\n", count);
+ count++;
+ }
+
+ /*
+ * free the channels where the test passed
+ * Channel resources are freed for a test that fails.
+ */
+ for (i = 0; i < count; i++)
+ hidma_free_chan_resources(dmach_ptr[i]);
+
+ if (failed)
+ break;
+ }
+
+failed_exit:
+ kfree(dmach_ptr);
+
+ return rc;
+}
+
+static int hidma_test_mapsingle(struct device *dev)
+{
+ u32 buf_size = 256;
+ char *src;
+ int ret = -ENOMEM;
+ dma_addr_t dma_src;
+
+ src = kmalloc(buf_size, GFP_KERNEL);
+ if (!src) {
+ dev_err(dev, "mapsingle: kmalloc failed ret:%d\n", ret);
+ return -ENOMEM;
+ }
+ strcpy(src, "hello world");
+
+ dma_src = dma_map_single(dev, src, buf_size, DMA_TO_DEVICE);
+ dev_dbg(dev, "mapsingle: src:%p src_dma:%pad\n", src, &dma_src);
+
+ ret = dma_mapping_error(dev, dma_src);
+ if (ret) {
+ dev_err(dev, "dma_mapping_error with ret:%d\n", ret);
+ ret = -ENOMEM;
+ } else {
+ phys_addr_t phys;
+
+ phys = dma_to_phys(dev, dma_src);
+ if (strcmp(__va(phys), "hello world") != 0) {
+ dev_err(dev, "memory content mismatch\n");
+ ret = -EINVAL;
+ } else {
+ dev_dbg(dev, "mapsingle:dma_map_single works\n");
+ }
+ dma_unmap_single(dev, dma_src, buf_size, DMA_TO_DEVICE);
+ }
+ kfree(src);
+ return ret;
+}
+
+/*
+ * Self test all DMA channels.
+ */
+static int hidma_memcpy_self_test(struct hidma_dev *device)
+{
+ int rc;
+
+ hidma_test_mapsingle(device->ddev.dev);
+
+ /* streaming test */
+ rc = hidma_selftest_all(device, false, false);
+ if (rc)
+ return rc;
+ dev_dbg(device->ddev.dev, "streaming self test passed\n");
+
+ /* coherent test */
+ rc = hidma_selftest_all(device, true, false);
+ if (rc)
+ return rc;
+
+ dev_dbg(device->ddev.dev, "coherent self test passed\n");
+
+ /* scatter gather test */
+ rc = hidma_selftest_all(device, false, true);
+ if (rc)
+ return rc;
+
+ dev_dbg(device->ddev.dev, "scatter gather self test passed\n");
+ return 0;
+}
+
+static irqreturn_t hidma_chirq_handler(int chirq, void *arg)
+{
+ void **lldev_ptr = arg;
+ irqreturn_t ret;
+ struct hidma_dev *dmadev = to_hidma_dev_from_lldev(lldev_ptr);
+
+ HIDMA_RUNTIME_GET(dmadev);
+ ret = hidma_ll_inthandler(chirq, *lldev_ptr);
+ HIDMA_RUNTIME_SET(dmadev);
+
+ return ret;
+}
+
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+
+#define SIER_CHAN_SHOW(chan, name) \
+ seq_printf(s, #name "=%u\n", chan->name)
+
+/**
+ * hidma_chan_stats: display HIDMA channel statistics
+ *
+ * Display the statistics for the current HIDMA virtual channel device.
+ */
+static int hidma_chan_stats(struct seq_file *s, void *unused)
+{
+ struct hidma_chan *mchan = s->private;
+ struct hidma_desc *mdesc;
+ struct hidma_dev *dmadev = mchan->dmadev;
+
+ HIDMA_RUNTIME_GET(dmadev);
+ SIER_CHAN_SHOW(mchan, paused);
+ SIER_CHAN_SHOW(mchan, dma_sig);
+ seq_puts(s, "prepared\n");
+ list_for_each_entry(mdesc, &mchan->prepared, node)
+ hidma_ll_chstats(s, mchan->dmadev->lldev, mdesc->tre_ch);
+
+ seq_puts(s, "active\n");
+ list_for_each_entry(mdesc, &mchan->active, node)
+ hidma_ll_chstats(s, mchan->dmadev->lldev,
+ mdesc->tre_ch);
+
+ seq_puts(s, "completed\n");
+ list_for_each_entry(mdesc, &mchan->completed, node)
+ hidma_ll_chstats(s, mchan->dmadev->lldev,
+ mdesc->tre_ch);
+
+ hidma_ll_devstats(s, mchan->dmadev->lldev);
+ HIDMA_RUNTIME_SET(dmadev);
+ return 0;
+}
+
+/**
+ * hidma_dma_info: display HIDMA device info
+ *
+ * Display the info for the current HIDMA device.
+ */
+static int hidma_dma_info(struct seq_file *s, void *unused)
+{
+ struct hidma_dev *dmadev = s->private;
+ struct dma_device *dma = &dmadev->ddev;
+
+ seq_printf(s, "nr_descriptors=%d\n", dmadev->nr_descriptors);
+ seq_printf(s, "dev_trca=%p\n", &dmadev->dev_trca);
+ seq_printf(s, "dev_trca_phys=%pa\n", &dmadev->dev_trca_phys);
+ seq_printf(s, "dev_trca_size=%pa\n", &dmadev->dev_trca_size);
+ seq_printf(s, "dev_evca=%p\n", &dmadev->dev_evca);
+ seq_printf(s, "dev_evca_phys=%pa\n", &dmadev->dev_evca_phys);
+ seq_printf(s, "dev_evca_size=%pa\n", &dmadev->dev_evca_size);
+ seq_printf(s, "self_test=%u\n",
+ atomic_read(&dmadev->test_result.counter));
+
+ seq_printf(s, "copy%s%s%s%s%s%s%s%s%s%s%s\n",
+ dma_has_cap(DMA_PQ, dma->cap_mask) ? " pq" : "",
+ dma_has_cap(DMA_PQ_VAL, dma->cap_mask) ? " pq_val" : "",
+ dma_has_cap(DMA_XOR, dma->cap_mask) ? " xor" : "",
+ dma_has_cap(DMA_XOR_VAL, dma->cap_mask) ? " xor_val" : "",
+ dma_has_cap(DMA_INTERRUPT, dma->cap_mask) ? " intr" : "",
+ dma_has_cap(DMA_SG, dma->cap_mask) ? " sg" : "",
+ dma_has_cap(DMA_ASYNC_TX, dma->cap_mask) ? " async" : "",
+ dma_has_cap(DMA_SLAVE, dma->cap_mask) ? " slave" : "",
+ dma_has_cap(DMA_CYCLIC, dma->cap_mask) ? " cyclic" : "",
+ dma_has_cap(DMA_INTERLEAVE, dma->cap_mask) ? " intl" : "",
+ dma_has_cap(DMA_MEMCPY, dma->cap_mask) ? " memcpy" : "");
+
+ return 0;
+}
+
+
+static int hidma_chan_stats_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, hidma_chan_stats, inode->i_private);
+}
+
+static int hidma_dma_info_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, hidma_dma_info, inode->i_private);
+}
+
+static const struct file_operations hidma_chan_fops = {
+ .open = hidma_chan_stats_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static const struct file_operations hidma_dma_fops = {
+ .open = hidma_dma_info_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+
+static void hidma_debug_uninit(struct hidma_dev *dmadev)
+{
+ struct list_head *position = NULL;
+
+ /* walk through the virtual channel list */
+ list_for_each(position, &dmadev->ddev.channels) {
+ struct hidma_chan *chan;
+
+ chan = list_entry(position, struct hidma_chan,
+ chan.device_node);
+ debugfs_remove(chan->stats);
+ debugfs_remove(chan->debugfs);
+ }
+
+ debugfs_remove(dmadev->stats);
+ debugfs_remove(dmadev->debugfs);
+}
+
+static int hidma_debug_init(struct hidma_dev *dmadev)
+{
+ int rc = 0;
+ int chidx = 0;
+ struct list_head *position = NULL;
+
+ dmadev->debugfs = debugfs_create_dir(dev_name(dmadev->ddev.dev), NULL);
+ if (!dmadev->debugfs) {
+ rc = -ENODEV;
+ return rc;
+ }
+
+ /* walk through the virtual channel list */
+ list_for_each(position, &dmadev->ddev.channels) {
+ struct hidma_chan *chan;
+
+ chan = list_entry(position, struct hidma_chan,
+ chan.device_node);
+ sprintf(chan->name, "chan%d", chidx);
+ chan->debugfs = debugfs_create_dir(chan->name,
+ dmadev->debugfs);
+ if (!chan->debugfs) {
+ rc = -ENOMEM;
+ goto cleanup;
+ }
+ chan->stats = debugfs_create_file("stats", S_IRUGO,
+ chan->debugfs, chan,
+ &hidma_chan_fops);
+ if (!chan->stats) {
+ rc = -ENOMEM;
+ goto cleanup;
+ }
+ chidx++;
+ }
+
+ dmadev->stats = debugfs_create_file("stats", S_IRUGO,
+ dmadev->debugfs, dmadev,
+ &hidma_dma_fops);
+ if (!dmadev->stats) {
+ rc = -ENOMEM;
+ goto cleanup;
+ }
+
+ return 0;
+cleanup:
+ hidma_debug_uninit(dmadev);
+ return rc;
+}
+#else
+static void hidma_debug_uninit(struct hidma_dev *dmadev)
+{
+}
+static int hidma_debug_init(struct hidma_dev *dmadev)
+{
+ return 0;
+}
+#endif
+
+static int hidma_probe(struct platform_device *pdev)
+{
+ struct hidma_dev *dmadev;
+ int rc = 0, i;
+ struct resource *trca_resource;
+ struct resource *evca_resource;
+ int chirq;
+
+ pm_runtime_set_autosuspend_delay(&pdev->dev, AUTOSUSPEND_TIMEOUT);
+ pm_runtime_use_autosuspend(&pdev->dev);
+ pm_runtime_set_active(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
+
+ trca_resource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!trca_resource) {
+ dev_err(&pdev->dev, "TRCA mem resource not found\n");
+ rc = -ENODEV;
+ goto resource_get_failed;
+ }
+
+ evca_resource = platform_get_resource(pdev, IORESOURCE_MEM, 1);
+ if (!evca_resource) {
+ dev_err(&pdev->dev, "EVCA mem resource not found\n");
+ rc = -ENODEV;
+ goto resource_get_failed;
+ }
+
+ /* This driver only handles the channel IRQs.
+ * Common IRQ is handled by the management driver.
+ */
+ chirq = platform_get_irq(pdev, 0);
+ if (chirq < 0) {
+ dev_err(&pdev->dev, "chirq resources not found\n");
+ rc = -ENODEV;
+ goto chirq_get_failed;
+ }
+
+ dev_dbg(&pdev->dev, "probe: starting\n");
+ dev_dbg(&pdev->dev, "We have %d resources\n", pdev->num_resources);
+
+ for (i = 0; i < pdev->num_resources; i++) {
+ dev_dbg(&pdev->dev, "[%d] resource: %pR\n", i,
+ &pdev->resource[i]);
+ }
+
+ dmadev = devm_kzalloc(&pdev->dev, sizeof(*dmadev), GFP_KERNEL);
+ if (!dmadev) {
+ dev_err(&pdev->dev, "probe: kzalloc failed\n");
+ rc = -ENOMEM;
+ goto device_alloc_failed;
+ }
+
+ INIT_LIST_HEAD(&dmadev->ddev.channels);
+ spin_lock_init(&dmadev->lock);
+ dmadev->ddev.dev = &pdev->dev;
+ HIDMA_RUNTIME_GET(dmadev);
+
+ dma_cap_set(DMA_MEMCPY, dmadev->ddev.cap_mask);
+ /* Apply default dma_mask if needed */
+ if (!pdev->dev.dma_mask) {
+ pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
+ pdev->dev.coherent_dma_mask = DMA_BIT_MASK(64);
+ }
+
+ dmadev->dev_evca_phys = evca_resource->start;
+ dmadev->dev_evca_size = resource_size(evca_resource);
+
+ dev_dbg(&pdev->dev, "dev_evca_phys:%pa\n", &dmadev->dev_evca_phys);
+ dev_dbg(&pdev->dev, "dev_evca_size:%pa\n", &dmadev->dev_evca_size);
+
+ dmadev->dev_evca = devm_ioremap_resource(&pdev->dev,
+ evca_resource);
+ if (IS_ERR(dmadev->dev_evca)) {
+ dev_err(&pdev->dev, "can't map i/o memory at %pa\n",
+ &dmadev->dev_evca_phys);
+ rc = -ENOMEM;
+ goto remap_evca_failed;
+ }
+ dev_dbg(&pdev->dev, "qcom_hidma: mapped EVCA %pa to %p\n",
+ &dmadev->dev_evca_phys, dmadev->dev_evca);
+
+ dmadev->dev_trca_phys = trca_resource->start;
+ dmadev->dev_trca_size = resource_size(trca_resource);
+
+ dev_dbg(&pdev->dev, "dev_trca_phys:%pa\n", &dmadev->dev_trca_phys);
+ dev_dbg(&pdev->dev, "dev_trca_size:%pa\n", &dmadev->dev_trca_size);
+
+ dmadev->dev_trca = devm_ioremap_resource(&pdev->dev,
+ trca_resource);
+ if (IS_ERR(dmadev->dev_trca)) {
+ dev_err(&pdev->dev, "can't map i/o memory at %pa\n",
+ &dmadev->dev_trca_phys);
+ rc = -ENOMEM;
+ goto remap_trca_failed;
+ }
+ dev_dbg(&pdev->dev, "qcom_hidma: mapped TRCA %pa to %p\n",
+ &dmadev->dev_trca_phys, dmadev->dev_trca);
+
+ init_waitqueue_head(&dmadev->test_result.wq);
+ dmadev->self_test = hidma_memcpy_self_test;
+ dmadev->ddev.device_prep_dma_memcpy = hidma_prep_dma_memcpy;
+ dmadev->ddev.device_alloc_chan_resources =
+ hidma_alloc_chan_resources;
+ dmadev->ddev.device_free_chan_resources = hidma_free_chan_resources;
+ dmadev->ddev.device_tx_status = hidma_tx_status;
+ dmadev->ddev.device_issue_pending = hidma_issue_pending;
+ dmadev->ddev.device_pause = hidma_pause;
+ dmadev->ddev.device_resume = hidma_resume;
+ dmadev->ddev.device_terminate_all = hidma_terminate_all;
+ dmadev->ddev.copy_align = 8;
+ dmadev->nr_descriptors = HIDMA_DEFAULT_DESCRIPTOR_COUNT;
+
+ device_property_read_u32(&pdev->dev, "desc-count",
+ &dmadev->nr_descriptors);
+
+ if (device_property_read_u8(&pdev->dev, "event-channel",
+ &dmadev->evridx)) {
+ dev_err(&pdev->dev, "probe:can't find the event channel id\n");
+ goto evridx_failed;
+ }
+
+ /* Set DMA mask to 64 bits. */
+ rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+ if (rc) {
+ dev_warn(&pdev->dev, "unable to set coherent mask to 64");
+ rc = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
+ }
+ if (rc)
+ dev_warn(&pdev->dev, "unable to set coherent mask to 32");
+
+ rc = hidma_ll_init(&dmadev->lldev, dmadev->ddev.dev,
+ dmadev->nr_descriptors, dmadev->dev_trca,
+ dmadev->dev_evca, dmadev->evridx);
+ if (rc) {
+ dev_err(&pdev->dev, "probe:channel core init failed\n");
+ goto ll_init_failed;
+ }
+
+ rc = devm_request_irq(&pdev->dev, chirq, hidma_chirq_handler, 0,
+ "qcom-hidma", &dmadev->lldev);
+ if (rc) {
+ dev_err(&pdev->dev, "chirq registration failed: %d\n", chirq);
+ goto chirq_request_failed;
+ }
+
+ dev_dbg(&pdev->dev, "initializing DMA channels\n");
+ INIT_LIST_HEAD(&dmadev->ddev.channels);
+ rc = hidma_chan_init(dmadev, 0);
+ if (rc) {
+ dev_err(&pdev->dev, "probe:channel init failed\n");
+ goto channel_init_failed;
+ }
+ dev_dbg(&pdev->dev, "HI-DMA engine driver starting self test\n");
+ rc = dmadev->self_test(dmadev);
+ if (rc) {
+ dev_err(&pdev->dev, "probe: self test failed: %d\n", rc);
+ goto self_test_failed;
+ }
+ dev_info(&pdev->dev, "probe: self test succeeded.\n");
+
+ dev_dbg(&pdev->dev, "calling dma_async_device_register\n");
+ rc = dma_async_device_register(&dmadev->ddev);
+ if (rc) {
+ dev_err(&pdev->dev,
+ "probe: failed to register slave DMA: %d\n", rc);
+ goto device_register_failed;
+ }
+ dev_dbg(&pdev->dev, "probe: dma_async_device_register done\n");
+
+ rc = hidma_debug_init(dmadev);
+ if (rc) {
+ dev_err(&pdev->dev,
+ "probe: failed to init debugfs: %d\n", rc);
+ goto debug_init_failed;
+ }
+
+ dev_info(&pdev->dev, "HI-DMA engine driver registration complete\n");
+ platform_set_drvdata(pdev, dmadev);
+ HIDMA_RUNTIME_SET(dmadev);
+ return 0;
+
+debug_init_failed:
+device_register_failed:
+self_test_failed:
+channel_init_failed:
+chirq_request_failed:
+ hidma_ll_uninit(dmadev->lldev);
+ll_init_failed:
+evridx_failed:
+remap_trca_failed:
+remap_evca_failed:
+ if (dmadev)
+ hidma_free(dmadev);
+device_alloc_failed:
+chirq_get_failed:
+resource_get_failed:
+ pm_runtime_disable(&pdev->dev);
+ pm_runtime_put_sync_suspend(&pdev->dev);
+ TRC_PM(&pdev->dev,
+ "%s:%d pm_runtime_put_autosuspend\n", __func__, __LINE__);
+ return rc;
+}
+
+static int hidma_remove(struct platform_device *pdev)
+{
+ struct hidma_dev *dmadev = platform_get_drvdata(pdev);
+
+ dev_dbg(&pdev->dev, "removing\n");
+ HIDMA_RUNTIME_GET(dmadev);
+ hidma_debug_uninit(dmadev);
+
+ dma_async_device_unregister(&dmadev->ddev);
+ hidma_ll_uninit(dmadev->lldev);
+ hidma_free(dmadev);
+
+ dev_info(&pdev->dev, "HI-DMA engine removed\n");
+ pm_runtime_put_sync_suspend(&pdev->dev);
+ TRC_PM(&pdev->dev,
+ "%s:%d pm_runtime_put_sync_suspend\n", __func__, __LINE__);
+ pm_runtime_disable(&pdev->dev);
+
+ return 0;
+}
+
+#if IS_ENABLED(CONFIG_ACPI)
+static const struct acpi_device_id hidma_acpi_ids[] = {
+ {"QCOM8061"},
+ {},
+};
+#endif
+
+static const struct of_device_id hidma_match[] = {
+ { .compatible = "qcom,hidma", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, hidma_match);
+
+static struct platform_driver hidma_driver = {
+ .probe = hidma_probe,
+ .remove = hidma_remove,
+ .driver = {
+ .name = MODULE_NAME,
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(hidma_match),
+ .acpi_match_table = ACPI_PTR(hidma_acpi_ids),
+ },
+};
+
+static int __init hidma_init(void)
+{
+ return platform_driver_register(&hidma_driver);
+}
+late_initcall(hidma_init);
+
+static void __exit hidma_exit(void)
+{
+ platform_driver_unregister(&hidma_driver);
+}
+module_exit(hidma_exit);
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/dma/qcom_hidma.h b/drivers/dma/qcom_hidma.h
new file mode 100644
index 0000000..0ab8314
--- /dev/null
+++ b/drivers/dma/qcom_hidma.h
@@ -0,0 +1,44 @@
+/*
+ * Qualcomm Technologies HIDMA data structures
+ *
+ * Copyright (c) 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.
+ */
+
+#ifndef QCOM_HIDMA_H
+#define QCOM_HIDMA_H
+
+struct hidma_lldev;
+struct hidma_llchan;
+struct seq_file;
+
+int hidma_ll_request(void *llhndl, u32 dev_id, const char *dev_name,
+ void (*callback)(void *data), void *data, u32 *tre_ch);
+
+void hidma_ll_free(void *llhndl, u32 tre_ch);
+enum dma_status hidma_ll_status(void *llhndl, u32 tre_ch);
+bool hidma_ll_isenabled(void *llhndl);
+int hidma_ll_queue_request(void *llhndl, u32 tre_ch);
+int hidma_ll_start(void *llhndl);
+int hidma_ll_pause(void *llhndl);
+int hidma_ll_resume(void *llhndl);
+void hidma_ll_set_transfer_params(void *llhndl, u32 tre_ch,
+ dma_addr_t src, dma_addr_t dest, u32 len, u32 flags);
+int hidma_ll_setup(struct hidma_lldev *lldev);
+int hidma_ll_init(void **llhndl, struct device *dev, u32 max_channels,
+ void __iomem *trca, void __iomem *evca,
+ u8 evridx);
+int hidma_ll_uninit(void *llhndl);
+irqreturn_t hidma_ll_inthandler(int irq, void *arg);
+void hidma_ll_chstats(struct seq_file *s, void *llhndl, u32 tre_ch);
+void hidma_ll_devstats(struct seq_file *s, void *llhndl);
+void hidma_cleanup_pending_tre(void *llhndl, u8 err_info, u8 err_code);
+#endif
diff --git a/drivers/dma/qcom_hidma_ll.c b/drivers/dma/qcom_hidma_ll.c
new file mode 100644
index 0000000..0188afd
--- /dev/null
+++ b/drivers/dma/qcom_hidma_ll.c
@@ -0,0 +1,1132 @@
+/*
+ * Qualcomm Technologies HIDMA DMA engine low level code
+ *
+ * Copyright (c) 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/dmaengine.h>
+#include <linux/slab.h>
+#include <linux/interrupt.h>
+#include <linux/mm.h>
+#include <linux/highmem.h>
+#include <linux/dma-mapping.h>
+#include <linux/delay.h>
+#include <linux/debugfs.h>
+#include <linux/atomic.h>
+#include "qcom_hidma.h"
+
+#define TRE_SIZE 32 /* each TRE is 32 bytes */
+#define EVRE_SIZE 16 /* each EVRE is 16 bytes */
+
+#define TRCA_CTRLSTS_OFFSET 0x0
+#define TRCA_RING_LOW_OFFSET 0x8
+#define TRCA_RING_HIGH_OFFSET 0xC
+#define TRCA_RING_LEN_OFFSET 0x10
+#define TRCA_READ_PTR_OFFSET 0x18
+#define TRCA_WRITE_PTR_OFFSET 0x20
+#define TRCA_DOORBELL_OFFSET 0x400
+
+#define EVCA_CTRLSTS_OFFSET 0x0
+#define EVCA_INTCTRL_OFFSET 0x4
+#define EVCA_RING_LOW_OFFSET 0x8
+#define EVCA_RING_HIGH_OFFSET 0xC
+#define EVCA_RING_LEN_OFFSET 0x10
+#define EVCA_READ_PTR_OFFSET 0x18
+#define EVCA_WRITE_PTR_OFFSET 0x20
+#define EVCA_DOORBELL_OFFSET 0x400
+
+#define EVCA_IRQ_STAT_OFFSET 0x100
+#define EVCA_IRQ_CLR_OFFSET 0x108
+#define EVCA_IRQ_EN_OFFSET 0x110
+
+#define TRE_CFG_IDX 0
+#define TRE_LEN_IDX 1
+#define TRE_SRC_LOW_IDX 2
+#define TRE_SRC_HI_IDX 3
+#define TRE_DEST_LOW_IDX 4
+#define TRE_DEST_HI_IDX 5
+
+#define EVRE_CFG_IDX 0
+#define EVRE_LEN_IDX 1
+#define EVRE_DEST_LOW_IDX 2
+#define EVRE_DEST_HI_IDX 3
+
+#define EVRE_ERRINFO_BIT_POS 24
+#define EVRE_CODE_BIT_POS 28
+
+#define EVRE_ERRINFO_MASK 0xF
+#define EVRE_CODE_MASK 0xF
+
+#define CH_CONTROL_MASK 0xFF
+#define CH_STATE_MASK 0xFF
+#define CH_STATE_BIT_POS 0x8
+
+#define MAKE64(high, low) (((u64)(high) << 32) | (low))
+
+#define IRQ_EV_CH_EOB_IRQ_BIT_POS 0
+#define IRQ_EV_CH_WR_RESP_BIT_POS 1
+#define IRQ_EV_CH_RESET_ERR_BIT_POS 5
+#define IRQ_TR_CH_TRE_RD_RSP_ER_BIT_POS 9
+#define IRQ_TR_CH_DATA_RD_ER_BIT_POS 10
+#define IRQ_TR_CH_DATA_WR_ER_BIT_POS 11
+#define IRQ_TR_CH_RESET_ERROR 13
+#define IRQ_TR_CH_INVALID_TRE_BIT_POS 14
+
+#define ENABLE_IRQS (BIT(IRQ_EV_CH_EOB_IRQ_BIT_POS) | \
+ BIT(IRQ_EV_CH_WR_RESP_BIT_POS) | \
+ BIT(IRQ_EV_CH_RESET_ERR_BIT_POS) | \
+ BIT(IRQ_TR_CH_TRE_RD_RSP_ER_BIT_POS) | \
+ BIT(IRQ_TR_CH_DATA_RD_ER_BIT_POS) | \
+ BIT(IRQ_TR_CH_DATA_WR_ER_BIT_POS) | \
+ BIT(IRQ_TR_CH_RESET_ERROR) | \
+ BIT(IRQ_TR_CH_INVALID_TRE_BIT_POS))
+
+enum ch_command {
+ CH_DISABLE = 0,
+ CH_ENABLE = 1,
+ CH_SUSPEND = 2,
+ CH_RESET = 9,
+};
+
+enum ch_state {
+ CH_DISABLED = 0,
+ CH_ENABLED = 1,
+ CH_RUNNING = 2,
+ CH_SUSPENDED = 3,
+ CH_STOPPED = 4,
+ CH_ERROR = 5,
+ CH_IN_RESET = 9,
+};
+
+enum tre_type {
+ TRE_MEMCPY = 3,
+ TRE_MEMSET = 4,
+};
+
+enum evre_type {
+ EVRE_DMA_COMPLETE = 0x23,
+ EVRE_IMM_DATA = 0x24,
+};
+
+enum err_code {
+ EVRE_STATUS_COMPLETE = 1,
+ EVRE_STATUS_ERROR = 4,
+};
+
+struct hidma_tx_status {
+ u8 err_info; /* error record in this transfer */
+ u8 err_code; /* completion code */
+};
+
+struct hidma_lldev {
+ bool initialized; /* initialized flag */
+ u8 trch_state; /* trch_state of the device */
+ u8 evch_state; /* evch_state of the device */
+ u8 evridx; /* event channel to notify */
+ u32 nr_tres; /* max number of configs */
+ spinlock_t lock; /* reentrancy */
+ struct hidma_tre *trepool; /* trepool of user configs */
+ struct device *dev; /* device */
+ void __iomem *trca; /* Transfer Channel address */
+ void __iomem *evca; /* Event Channel address */
+ struct hidma_tre
+ **pending_tre_list; /* Pointers to pending TREs */
+ struct hidma_tx_status
+ *tx_status_list; /* Pointers to pending TREs status*/
+ s32 pending_tre_count; /* Number of TREs pending */
+
+ void *tre_ring; /* TRE ring */
+ dma_addr_t tre_ring_handle; /* TRE ring to be shared with HW */
+ u32 tre_ring_size; /* Byte size of the ring */
+ u32 tre_processed_off; /* last processed TRE */
+
+ void *evre_ring; /* EVRE ring */
+ dma_addr_t evre_ring_handle; /* EVRE ring to be shared with HW */
+ u32 evre_ring_size; /* Byte size of the ring */
+ u32 evre_processed_off; /* last processed EVRE */
+
+ u32 tre_write_offset; /* TRE write location */
+};
+
+struct hidma_tre {
+ atomic_t allocated; /* if this channel is allocated */
+ bool queued; /* flag whether this is pending */
+ u16 status; /* status */
+ u32 chidx; /* index of the tre */
+ u32 dma_sig; /* signature of the tre */
+ const char *dev_name; /* name of the device */
+ void (*callback)(void *data); /* requester callback */
+ void *data; /* Data associated with this channel*/
+ struct hidma_lldev *lldev; /* lldma device pointer */
+ u32 tre_local[TRE_SIZE / sizeof(u32) + 1]; /* TRE local copy */
+ struct tasklet_struct task; /* task delivering notifications */
+ u32 tre_index; /* the offset where this was written*/
+ u32 int_flags; /* interrupt flags*/
+};
+
+void hidma_ll_free(void *llhndl, u32 tre_ch)
+{
+ struct hidma_lldev *lldev = llhndl;
+ struct hidma_tre *tre;
+
+ if (unlikely(tre_ch >= lldev->nr_tres)) {
+ dev_err(lldev->dev, "invalid TRE number in free:%d", tre_ch);
+ return;
+ }
+
+ tre = &lldev->trepool[tre_ch];
+ if (unlikely(atomic_read(&tre->allocated) != true)) {
+ dev_err(lldev->dev, "trying to free an unused TRE:%d",
+ tre_ch);
+ return;
+ }
+
+ atomic_set(&tre->allocated, 0);
+ dev_dbg(lldev->dev, "free_dma: allocated:%d tre_ch:%d\n",
+ atomic_read(&tre->allocated), tre_ch);
+}
+EXPORT_SYMBOL_GPL(hidma_ll_free);
+
+int hidma_ll_request(void *llhndl, u32 dma_sig, const char *dev_name,
+ void (*callback)(void *data), void *data, u32 *tre_ch)
+{
+ u32 i;
+ struct hidma_lldev *lldev = llhndl;
+ struct hidma_tre *tre = NULL;
+ u32 *tre_local;
+
+ if (unlikely(!tre_ch) || unlikely(!lldev))
+ return -EINVAL;
+
+ /* need to have at least one empty spot in the queue */
+ for (i = 0; i < lldev->nr_tres - 1; i++) {
+ if (atomic_add_unless(&lldev->trepool[i].allocated, 1, 1))
+ break;
+ }
+
+ if (i == (lldev->nr_tres - 1))
+ return -ENOMEM;
+
+ tre = &lldev->trepool[i];
+ tre->dma_sig = dma_sig;
+ tre->dev_name = dev_name;
+ tre->callback = callback;
+ tre->data = data;
+ tre->chidx = i;
+ tre->status = 0;
+ tre->queued = 0;
+ lldev->tx_status_list[i].err_code = 0;
+ tre->lldev = lldev;
+ tre_local = &tre->tre_local[0];
+ tre_local[TRE_CFG_IDX] = TRE_MEMCPY;
+ tre_local[TRE_CFG_IDX] |= ((lldev->evridx & 0xFF) << 8);
+ tre_local[TRE_CFG_IDX] |= BIT(16); /* set IEOB */
+ *tre_ch = i;
+ if (callback)
+ callback(data);
+ return 1;
+}
+EXPORT_SYMBOL_GPL(hidma_ll_request);
+
+/*
+ * Multiple TREs may be queued and waiting in the
+ * pending queue.
+ */
+static void hidma_ll_tre_complete(unsigned long arg)
+{
+ struct hidma_tre *tre = (struct hidma_tre *)arg;
+
+ /* call the user if it has been read by the hardware*/
+ if (tre->callback)
+ tre->callback(tre->data);
+}
+
+/*
+ * Called to handle the interrupt for the channel.
+ * Return a positive number if TRE or EVRE were consumed on this run.
+ * Return a positive number if there are pending TREs or EVREs.
+ * Return 0 if there is nothing to consume or no pending TREs/EVREs found.
+ */
+static int hidma_handle_tre_completion(struct hidma_lldev *lldev)
+{
+ struct hidma_tre *tre;
+ u32 evre_write_off;
+ u32 evre_ring_size = lldev->evre_ring_size;
+ u32 tre_ring_size = lldev->tre_ring_size;
+ u32 num_completed = 0, tre_iterator, evre_iterator;
+ unsigned long flags;
+
+ evre_write_off = readl_relaxed(lldev->evca + EVCA_WRITE_PTR_OFFSET);
+ tre_iterator = lldev->tre_processed_off;
+ evre_iterator = lldev->evre_processed_off;
+
+ if ((evre_write_off > evre_ring_size) ||
+ ((evre_write_off % EVRE_SIZE) != 0)) {
+ dev_err(lldev->dev, "HW reports invalid EVRE write offset\n");
+ return 0;
+ }
+
+ /* By the time control reaches here the number of EVREs and TREs
+ * may not match. Only consume the ones that hardware told us.
+ */
+ while ((evre_iterator != evre_write_off)) {
+ u32 *current_evre = lldev->evre_ring + evre_iterator;
+ u32 cfg;
+ u8 err_info;
+
+ spin_lock_irqsave(&lldev->lock, flags);
+ tre = lldev->pending_tre_list[tre_iterator / TRE_SIZE];
+ if (!tre) {
+ spin_unlock_irqrestore(&lldev->lock, flags);
+ dev_warn(lldev->dev,
+ "tre_index [%d] and tre out of sync\n",
+ tre_iterator / TRE_SIZE);
+ tre_iterator += TRE_SIZE;
+ if (tre_iterator >= tre_ring_size)
+ tre_iterator -= tre_ring_size;
+ evre_iterator += EVRE_SIZE;
+ if (evre_iterator >= evre_ring_size)
+ evre_iterator -= evre_ring_size;
+
+ continue;
+ }
+ lldev->pending_tre_list[tre->tre_index] = NULL;
+
+ /* Keep track of pending TREs that SW is expecting to receive
+ * from HW. We got one now. Decrement our counter.
+ */
+ lldev->pending_tre_count--;
+ if (lldev->pending_tre_count < 0) {
+ dev_warn(lldev->dev,
+ "tre count mismatch on completion");
+ lldev->pending_tre_count = 0;
+ }
+
+ spin_unlock_irqrestore(&lldev->lock, flags);
+
+ cfg = current_evre[EVRE_CFG_IDX];
+ err_info = (cfg >> EVRE_ERRINFO_BIT_POS);
+ err_info = err_info & EVRE_ERRINFO_MASK;
+ lldev->tx_status_list[tre->chidx].err_info = err_info;
+ lldev->tx_status_list[tre->chidx].err_code =
+ (cfg >> EVRE_CODE_BIT_POS) & EVRE_CODE_MASK;
+ tre->queued = 0;
+
+ tasklet_schedule(&tre->task);
+
+ tre_iterator += TRE_SIZE;
+ if (tre_iterator >= tre_ring_size)
+ tre_iterator -= tre_ring_size;
+ evre_iterator += EVRE_SIZE;
+ if (evre_iterator >= evre_ring_size)
+ evre_iterator -= evre_ring_size;
+
+ /* Read the new event descriptor written by the HW.
+ * As we are processing the delivered events, other events
+ * get queued to the SW for processing.
+ */
+ evre_write_off =
+ readl_relaxed(lldev->evca + EVCA_WRITE_PTR_OFFSET);
+ num_completed++;
+ }
+
+ if (num_completed) {
+ u32 evre_read_off = (lldev->evre_processed_off +
+ EVRE_SIZE * num_completed);
+ u32 tre_read_off = (lldev->tre_processed_off +
+ TRE_SIZE * num_completed);
+
+ evre_read_off = evre_read_off % evre_ring_size;
+ tre_read_off = tre_read_off % tre_ring_size;
+
+ writel(evre_read_off, lldev->evca + EVCA_DOORBELL_OFFSET);
+
+ /* record the last processed tre offset */
+ lldev->tre_processed_off = tre_read_off;
+ lldev->evre_processed_off = evre_read_off;
+ }
+
+ return num_completed;
+}
+
+void hidma_cleanup_pending_tre(void *llhndl, u8 err_info, u8 err_code)
+{
+ u32 tre_iterator;
+ struct hidma_tre *tre;
+ struct hidma_lldev *lldev = llhndl;
+ u32 tre_ring_size = lldev->tre_ring_size;
+ int num_completed = 0;
+ u32 tre_read_off;
+ unsigned long flags;
+
+ tre_iterator = lldev->tre_processed_off;
+ while (lldev->pending_tre_count) {
+ int tre_index = tre_iterator / TRE_SIZE;
+
+ spin_lock_irqsave(&lldev->lock, flags);
+ tre = lldev->pending_tre_list[tre_index];
+ if (!tre) {
+ spin_unlock_irqrestore(&lldev->lock, flags);
+ tre_iterator += TRE_SIZE;
+ if (tre_iterator >= tre_ring_size)
+ tre_iterator -= tre_ring_size;
+ continue;
+ }
+ lldev->pending_tre_list[tre_index] = NULL;
+ lldev->pending_tre_count--;
+ if (lldev->pending_tre_count < 0) {
+ dev_warn(lldev->dev,
+ "tre count mismatch on completion");
+ lldev->pending_tre_count = 0;
+ }
+ spin_unlock_irqrestore(&lldev->lock, flags);
+
+ lldev->tx_status_list[tre->chidx].err_info = err_info;
+ lldev->tx_status_list[tre->chidx].err_code = err_code;
+ tre->queued = 0;
+
+ tasklet_schedule(&tre->task);
+
+ tre_iterator += TRE_SIZE;
+ if (tre_iterator >= tre_ring_size)
+ tre_iterator -= tre_ring_size;
+
+ num_completed++;
+ }
+ tre_read_off = (lldev->tre_processed_off +
+ TRE_SIZE * num_completed);
+
+ tre_read_off = tre_read_off % tre_ring_size;
+
+ /* record the last processed tre offset */
+ lldev->tre_processed_off = tre_read_off;
+}
+EXPORT_SYMBOL_GPL(hidma_cleanup_pending_tre);
+
+static int hidma_ll_reset(struct hidma_lldev *lldev)
+{
+ u32 val;
+ int count;
+
+ val = readl_relaxed(lldev->trca + TRCA_CTRLSTS_OFFSET);
+ val = val & ~(CH_CONTROL_MASK << 16);
+ val = val | (CH_RESET << 16);
+ writel_relaxed(val, lldev->trca + TRCA_CTRLSTS_OFFSET);
+
+ /* wait until the reset is performed */
+ wmb();
+
+ /* Delay 10ms after reset to allow DMA logic to quiesce.*/
+ for (count = 0; count < 10; count++) {
+ val = readl_relaxed(lldev->trca + TRCA_CTRLSTS_OFFSET);
+ lldev->trch_state = (val >> CH_STATE_BIT_POS)
+ & CH_STATE_MASK;
+ if (lldev->trch_state == CH_DISABLED)
+ break;
+ mdelay(1);
+ }
+ val = readl_relaxed(lldev->trca + TRCA_CTRLSTS_OFFSET);
+ lldev->trch_state = (val >> CH_STATE_BIT_POS) & CH_STATE_MASK;
+ if (lldev->trch_state != CH_DISABLED) {
+ dev_err(lldev->dev,
+ "transfer channel did not reset\n");
+ return -ENODEV;
+ }
+
+ val = readl_relaxed(lldev->evca + EVCA_CTRLSTS_OFFSET);
+ val = val & ~(CH_CONTROL_MASK << 16);
+ val = val | (CH_RESET << 16);
+ writel_relaxed(val, lldev->evca + EVCA_CTRLSTS_OFFSET);
+
+ /* wait until the reset is performed */
+ wmb();
+
+ /* Delay 10ms after reset to allow DMA logic to quiesce.*/
+ for (count = 0; count < 10; count++) {
+ val = readl_relaxed(lldev->evca + EVCA_CTRLSTS_OFFSET);
+ lldev->evch_state = (val >> CH_STATE_BIT_POS)
+ & CH_STATE_MASK;
+ if (lldev->evch_state == CH_DISABLED)
+ break;
+ mdelay(1);
+ }
+ val = readl_relaxed(lldev->evca + EVCA_CTRLSTS_OFFSET);
+ lldev->evch_state = (val >> CH_STATE_BIT_POS) & CH_STATE_MASK;
+ if (lldev->evch_state != CH_DISABLED) {
+ dev_err(lldev->dev,
+ "event channel did not reset\n");
+ return -ENODEV;
+ }
+
+ /* ensure that both channels are disabled before leaving*/
+ mb();
+ lldev->trch_state = CH_DISABLED;
+ lldev->evch_state = CH_DISABLED;
+ return 0;
+}
+
+static void hidma_ll_enable_irq(struct hidma_lldev *lldev, u32 irq_bits)
+{
+ writel_relaxed(irq_bits, lldev->evca + EVCA_IRQ_EN_OFFSET);
+ dev_dbg(lldev->dev, "enableirq\n");
+}
+
+/*
+ * The interrupt handler for HIDMA will try to consume as many pending
+ * EVRE from the event queue as possible. Each EVRE has an associated
+ * TRE that holds the user interface parameters. EVRE reports the
+ * result of the transaction. Hardware guarantees ordering between EVREs
+ * and TREs. We use last processed offset to figure out which TRE is
+ * associated with which EVRE. If two TREs are consumed by HW, the EVREs
+ * are in order in the event ring.
+ * This handler will do a one pass for consuming EVREs. Other EVREs may
+ * be delivered while we are working. It will try to consume incoming
+ * EVREs one more time and return.
+ * For unprocessed EVREs, hardware will trigger another interrupt until
+ * all the interrupt bits are cleared.
+ */
+static void hidma_ll_int_handler_internal(struct hidma_lldev *lldev)
+{
+ u32 status;
+ u32 enable;
+ u32 cause;
+ int repeat = 2;
+ unsigned long timeout;
+
+ status = readl_relaxed(lldev->evca + EVCA_IRQ_STAT_OFFSET);
+ enable = readl_relaxed(lldev->evca + EVCA_IRQ_EN_OFFSET);
+ cause = status & enable;
+
+ if ((cause & (1<<IRQ_EV_CH_RESET_ERR_BIT_POS))
+ || (cause & (1<<IRQ_TR_CH_RESET_ERROR))) {
+ u8 err_code = EVRE_STATUS_ERROR;
+ u8 err_info = 0xFE;
+
+ /* Clear out pending interrupts */
+ writel(cause, lldev->evca + EVCA_IRQ_CLR_OFFSET);
+
+ hidma_cleanup_pending_tre(lldev, err_info, err_code);
+ dev_err(lldev->dev,
+ "The channel is terminated(%x).Hardware reset needed\n",
+ cause);
+ return;
+ }
+
+ if ((cause & (BIT(IRQ_TR_CH_INVALID_TRE_BIT_POS))) ||
+ (cause & BIT(IRQ_TR_CH_TRE_RD_RSP_ER_BIT_POS)) ||
+ (cause & BIT(IRQ_EV_CH_WR_RESP_BIT_POS)) ||
+ (cause & BIT(IRQ_TR_CH_DATA_RD_ER_BIT_POS)) ||
+ (cause & BIT(IRQ_TR_CH_DATA_WR_ER_BIT_POS))) {
+ u8 err_code = EVRE_STATUS_ERROR;
+ u8 err_info = 0xFF;
+
+ /* Clear out pending interrupts */
+ writel(cause, lldev->evca + EVCA_IRQ_CLR_OFFSET);
+
+ dev_err(lldev->dev,
+ "error 0x%x, resetting...\n", cause);
+
+ hidma_cleanup_pending_tre(lldev, err_info, err_code);
+
+ /* reset the channel for recovery */
+ if (hidma_ll_setup(lldev)) {
+ dev_err(lldev->dev,
+ "channel reinitialize failed after error\n");
+ return;
+ }
+ hidma_ll_enable_irq(lldev, ENABLE_IRQS);
+ return;
+ }
+
+ /* Try to consume as many EVREs as possible.
+ * skip this loop if the interrupt is spurious.
+ */
+ while (cause && repeat) {
+ unsigned long start = jiffies;
+
+ /* This timeout should be sufficent for core to finish */
+ timeout = start + msecs_to_jiffies(500);
+
+ while (lldev->pending_tre_count) {
+ hidma_handle_tre_completion(lldev);
+ if (time_is_before_jiffies(timeout)) {
+ dev_warn(lldev->dev,
+ "ISR timeout %lx vs. %lx from %lx [%d]\n",
+ jiffies, timeout, start,
+ lldev->pending_tre_count);
+ break;
+ }
+ }
+
+ /* We consumed TREs or there are pending TREs or EVREs. */
+ writel_relaxed(cause, lldev->evca + EVCA_IRQ_CLR_OFFSET);
+
+ /* Another interrupt might have arrived while we are
+ * processing this one. Read the new cause.
+ */
+ status = readl_relaxed(lldev->evca + EVCA_IRQ_STAT_OFFSET);
+ enable = readl_relaxed(lldev->evca + EVCA_IRQ_EN_OFFSET);
+ cause = status & enable;
+
+ repeat--;
+ }
+}
+
+
+static int hidma_ll_enable(struct hidma_lldev *lldev)
+{
+ u32 val;
+
+ val = readl_relaxed(lldev->evca + EVCA_CTRLSTS_OFFSET);
+ val &= ~(CH_CONTROL_MASK << 16);
+ val |= (CH_ENABLE << 16);
+
+ writel_relaxed(val, lldev->evca + EVCA_CTRLSTS_OFFSET);
+
+ /* wait until channel is enabled */
+ wmb();
+
+ mdelay(1);
+
+ val = readl_relaxed(lldev->evca + EVCA_CTRLSTS_OFFSET);
+ lldev->evch_state = (val >> CH_STATE_BIT_POS) & CH_STATE_MASK;
+ if ((lldev->evch_state != CH_ENABLED) &&
+ (lldev->evch_state != CH_RUNNING)) {
+ dev_err(lldev->dev,
+ "event channel did not get enabled\n");
+ return -ENODEV;
+ }
+
+ val = readl_relaxed(lldev->trca + TRCA_CTRLSTS_OFFSET);
+ val = val & ~(CH_CONTROL_MASK << 16);
+ val = val | (CH_ENABLE << 16);
+ writel_relaxed(val, lldev->trca + TRCA_CTRLSTS_OFFSET);
+
+ /* wait until channel is enabled */
+ wmb();
+
+ mdelay(1);
+
+ val = readl_relaxed(lldev->trca + TRCA_CTRLSTS_OFFSET);
+ lldev->trch_state = (val >> CH_STATE_BIT_POS) & CH_STATE_MASK;
+ if ((lldev->trch_state != CH_ENABLED) &&
+ (lldev->trch_state != CH_RUNNING)) {
+ dev_err(lldev->dev,
+ "transfer channel did not get enabled\n");
+ return -ENODEV;
+ }
+
+ /* ensure that both channels are enabled before leaving*/
+ mb();
+
+ lldev->trch_state = CH_ENABLED;
+ lldev->evch_state = CH_ENABLED;
+
+ return 0;
+}
+
+int hidma_ll_resume(void *llhndl)
+{
+ return hidma_ll_enable((struct hidma_lldev *)llhndl);
+}
+EXPORT_SYMBOL_GPL(hidma_ll_resume);
+
+static int hidma_ll_hw_start(void *llhndl)
+{
+ int rc = 0;
+ struct hidma_lldev *lldev = llhndl;
+ unsigned long irqflags;
+
+ spin_lock_irqsave(&lldev->lock, irqflags);
+ writel_relaxed(lldev->tre_write_offset,
+ lldev->trca + TRCA_DOORBELL_OFFSET);
+ spin_unlock_irqrestore(&lldev->lock, irqflags);
+
+ return rc;
+}
+
+bool hidma_ll_isenabled(void *llhndl)
+{
+ struct hidma_lldev *lldev = llhndl;
+ u32 val;
+
+ val = readl_relaxed(lldev->trca + TRCA_CTRLSTS_OFFSET);
+ lldev->trch_state = (val >> CH_STATE_BIT_POS) & CH_STATE_MASK;
+ val = readl_relaxed(lldev->evca + EVCA_CTRLSTS_OFFSET);
+ lldev->evch_state = (val >> CH_STATE_BIT_POS) & CH_STATE_MASK;
+
+ /* both channels have to be enabled before calling this function*/
+ if (((lldev->trch_state == CH_ENABLED) ||
+ (lldev->trch_state == CH_RUNNING)) &&
+ ((lldev->evch_state == CH_ENABLED) ||
+ (lldev->evch_state == CH_RUNNING)))
+ return true;
+
+ dev_dbg(lldev->dev, "channels are not enabled or are in error state");
+ return false;
+}
+EXPORT_SYMBOL_GPL(hidma_ll_isenabled);
+
+int hidma_ll_queue_request(void *llhndl, u32 tre_ch)
+{
+ struct hidma_lldev *lldev = llhndl;
+ struct hidma_tre *tre;
+ int rc = 0;
+ unsigned long flags;
+
+ tre = &lldev->trepool[tre_ch];
+
+ /* copy the TRE into its location in the TRE ring */
+ spin_lock_irqsave(&lldev->lock, flags);
+ tre->tre_index = lldev->tre_write_offset / TRE_SIZE;
+ lldev->pending_tre_list[tre->tre_index] = tre;
+ memcpy(lldev->tre_ring + lldev->tre_write_offset, &tre->tre_local[0],
+ TRE_SIZE);
+ lldev->tx_status_list[tre->chidx].err_code = 0;
+ lldev->tx_status_list[tre->chidx].err_info = 0;
+ tre->queued = 1;
+ lldev->pending_tre_count++;
+ lldev->tre_write_offset = (lldev->tre_write_offset + TRE_SIZE)
+ % lldev->tre_ring_size;
+ spin_unlock_irqrestore(&lldev->lock, flags);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(hidma_ll_queue_request);
+
+int hidma_ll_start(void *llhndl)
+{
+ return hidma_ll_hw_start(llhndl);
+}
+EXPORT_SYMBOL_GPL(hidma_ll_start);
+
+/*
+ * Note that even though we stop this channel
+ * if there is a pending transaction in flight
+ * it will complete and follow the callback.
+ * This request will prevent further requests
+ * to be made.
+ */
+int hidma_ll_pause(void *llhndl)
+{
+ struct hidma_lldev *lldev = llhndl;
+ u32 val;
+ int count;
+
+ val = readl_relaxed(lldev->evca + EVCA_CTRLSTS_OFFSET);
+ lldev->evch_state = (val >> CH_STATE_BIT_POS) & CH_STATE_MASK;
+ val = readl_relaxed(lldev->trca + TRCA_CTRLSTS_OFFSET);
+ lldev->trch_state = (val >> CH_STATE_BIT_POS) & CH_STATE_MASK;
+
+ /* already suspended by this OS */
+ if ((lldev->trch_state == CH_SUSPENDED) ||
+ (lldev->evch_state == CH_SUSPENDED))
+ return 0;
+
+ /* already stopped by the manager */
+ if ((lldev->trch_state == CH_STOPPED) ||
+ (lldev->evch_state == CH_STOPPED))
+ return 0;
+
+ val = readl_relaxed(lldev->trca + TRCA_CTRLSTS_OFFSET);
+ val = val & ~(CH_CONTROL_MASK << 16);
+ val = val | (CH_SUSPEND << 16);
+ writel_relaxed(val, lldev->trca + TRCA_CTRLSTS_OFFSET);
+
+ /* start the wait right after the suspend is confirmed */
+ wmb();
+
+ /* Delay 10ms after reset to allow DMA logic to quiesce.*/
+ for (count = 0; count < 10; count++) {
+ val = readl_relaxed(lldev->trca + TRCA_CTRLSTS_OFFSET);
+ lldev->trch_state = (val >> CH_STATE_BIT_POS)
+ & CH_STATE_MASK;
+ if (lldev->trch_state == CH_SUSPENDED)
+ break;
+ mdelay(1);
+ }
+ val = readl_relaxed(lldev->trca + TRCA_CTRLSTS_OFFSET);
+ lldev->trch_state = (val >> CH_STATE_BIT_POS) & CH_STATE_MASK;
+ if (lldev->trch_state != CH_SUSPENDED)
+ return -ENODEV;
+
+ val = readl_relaxed(lldev->evca + EVCA_CTRLSTS_OFFSET);
+ val = val & ~(CH_CONTROL_MASK << 16);
+ val = val | (CH_SUSPEND << 16);
+ writel_relaxed(val, lldev->evca + EVCA_CTRLSTS_OFFSET);
+
+ /* start the wait right after the suspend is confirmed */
+ wmb();
+
+ /* Delay 10ms after reset to allow DMA logic to quiesce.*/
+ for (count = 0; count < 10; count++) {
+ val = readl_relaxed(lldev->evca + EVCA_CTRLSTS_OFFSET);
+ lldev->evch_state = (val >> CH_STATE_BIT_POS)
+ & CH_STATE_MASK;
+ if (lldev->evch_state == CH_SUSPENDED)
+ break;
+ mdelay(1);
+ }
+ val = readl_relaxed(lldev->evca + EVCA_CTRLSTS_OFFSET);
+ lldev->evch_state = (val >> CH_STATE_BIT_POS) & CH_STATE_MASK;
+ if (lldev->evch_state != CH_SUSPENDED)
+ return -ENODEV;
+
+ /* ensure that both channels are suspended before leaving*/
+ mb();
+
+ lldev->trch_state = CH_SUSPENDED;
+ lldev->evch_state = CH_SUSPENDED;
+ dev_dbg(lldev->dev, "stop\n");
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(hidma_ll_pause);
+
+void hidma_ll_set_transfer_params(void *llhndl, u32 tre_ch,
+ dma_addr_t src, dma_addr_t dest, u32 len, u32 flags)
+{
+ struct hidma_lldev *lldev = llhndl;
+ struct hidma_tre *tre;
+ u32 *tre_local;
+
+ if (unlikely(tre_ch >= lldev->nr_tres)) {
+ dev_err(lldev->dev,
+ "invalid TRE number in transfer params:%d", tre_ch);
+ return;
+ }
+
+ tre = &lldev->trepool[tre_ch];
+ if (unlikely(atomic_read(&tre->allocated) != true)) {
+ dev_err(lldev->dev,
+ "trying to set params on an unused TRE:%d", tre_ch);
+ return;
+ }
+
+ tre_local = &tre->tre_local[0];
+ tre_local[TRE_LEN_IDX] = len;
+ tre_local[TRE_SRC_LOW_IDX] = lower_32_bits(src);
+ tre_local[TRE_SRC_HI_IDX] = upper_32_bits(src);
+ tre_local[TRE_DEST_LOW_IDX] = lower_32_bits(dest);
+ tre_local[TRE_DEST_HI_IDX] = upper_32_bits(dest);
+ tre->int_flags = flags;
+
+ dev_dbg(lldev->dev, "transferparams: tre_ch:%d %pap->%pap len:%u\n",
+ tre_ch, &src, &dest, len);
+}
+EXPORT_SYMBOL_GPL(hidma_ll_set_transfer_params);
+
+/* Called during initialization and after an error condition
+ * to restore hardware state.
+ */
+int hidma_ll_setup(struct hidma_lldev *lldev)
+{
+ int rc;
+ u64 addr;
+ u32 val;
+ u32 nr_tres = lldev->nr_tres;
+
+ lldev->pending_tre_count = 0;
+ lldev->tre_processed_off = 0;
+ lldev->evre_processed_off = 0;
+ lldev->tre_write_offset = 0;
+
+ /* disable interrupts */
+ hidma_ll_enable_irq(lldev, 0);
+
+ /* clear all pending interrupts */
+ val = readl_relaxed(lldev->evca + EVCA_IRQ_STAT_OFFSET);
+ writel_relaxed(val, lldev->evca + EVCA_IRQ_CLR_OFFSET);
+
+ rc = hidma_ll_reset(lldev);
+ if (rc)
+ return rc;
+
+ /* Clear all pending interrupts again.
+ * Otherwise, we observe reset complete interrupts.
+ */
+ val = readl_relaxed(lldev->evca + EVCA_IRQ_STAT_OFFSET);
+ writel_relaxed(val, lldev->evca + EVCA_IRQ_CLR_OFFSET);
+
+ /* disable interrupts again after reset */
+ hidma_ll_enable_irq(lldev, 0);
+
+ addr = lldev->tre_ring_handle;
+ writel_relaxed(lower_32_bits(addr),
+ lldev->trca + TRCA_RING_LOW_OFFSET);
+ writel_relaxed(upper_32_bits(addr),
+ lldev->trca + TRCA_RING_HIGH_OFFSET);
+ writel_relaxed(lldev->tre_ring_size,
+ lldev->trca + TRCA_RING_LEN_OFFSET);
+
+ addr = lldev->evre_ring_handle;
+ writel_relaxed(lower_32_bits(addr),
+ lldev->evca + EVCA_RING_LOW_OFFSET);
+ writel_relaxed(upper_32_bits(addr),
+ lldev->evca + EVCA_RING_HIGH_OFFSET);
+ writel_relaxed(EVRE_SIZE * nr_tres,
+ lldev->evca + EVCA_RING_LEN_OFFSET);
+
+ /* support IRQ only for now */
+ val = readl_relaxed(lldev->evca + EVCA_INTCTRL_OFFSET);
+ val = val & ~(0xF);
+ val = val | 0x1;
+ writel_relaxed(val, lldev->evca + EVCA_INTCTRL_OFFSET);
+
+ /* clear all pending interrupts and enable them*/
+ writel_relaxed(ENABLE_IRQS, lldev->evca + EVCA_IRQ_CLR_OFFSET);
+ hidma_ll_enable_irq(lldev, ENABLE_IRQS);
+
+ rc = hidma_ll_enable(lldev);
+ if (rc)
+ return rc;
+
+ return rc;
+}
+EXPORT_SYMBOL_GPL(hidma_ll_setup);
+
+int hidma_ll_init(void **lldevp, struct device *dev, u32 nr_tres,
+ void __iomem *trca, void __iomem *evca,
+ u8 evridx)
+{
+ u32 required_bytes;
+ struct hidma_lldev *lldev;
+ int rc;
+ u32 i;
+
+ if (!lldevp || !trca || !evca || !dev || !nr_tres)
+ return -EINVAL;
+
+ /* need at least four TREs */
+ if (nr_tres < 4)
+ return -EINVAL;
+
+ /* need an extra space */
+ nr_tres += 1;
+
+ lldev = devm_kzalloc(dev, sizeof(struct hidma_lldev), GFP_KERNEL);
+ if (!lldev)
+ return -ENOMEM;
+
+ lldev->evca = evca;
+ lldev->trca = trca;
+ lldev->dev = dev;
+ required_bytes = sizeof(struct hidma_tre) * nr_tres;
+ lldev->trepool = devm_kzalloc(lldev->dev, required_bytes, GFP_KERNEL);
+ if (!lldev->trepool)
+ return -ENOMEM;
+
+ required_bytes = sizeof(lldev->pending_tre_list[0]) * nr_tres;
+ lldev->pending_tre_list = devm_kzalloc(dev, required_bytes, GFP_KERNEL);
+ if (!lldev->pending_tre_list)
+ return -ENOMEM;
+
+ required_bytes = sizeof(lldev->tx_status_list[0]) * nr_tres;
+ lldev->tx_status_list = devm_kzalloc(dev, required_bytes, GFP_KERNEL);
+ if (!lldev->tx_status_list)
+ return -ENOMEM;
+
+ lldev->tre_ring = dmam_alloc_coherent(dev, (TRE_SIZE + 1) * nr_tres,
+ &lldev->tre_ring_handle, GFP_KERNEL);
+ if (!lldev->tre_ring)
+ return -ENOMEM;
+
+ memset(lldev->tre_ring, 0, (TRE_SIZE + 1) * nr_tres);
+ lldev->tre_ring_size = TRE_SIZE * nr_tres;
+ lldev->nr_tres = nr_tres;
+
+ /* the TRE ring has to be TRE_SIZE aligned */
+ if (!IS_ALIGNED(lldev->tre_ring_handle, TRE_SIZE)) {
+ u8 tre_ring_shift;
+
+ tre_ring_shift = lldev->tre_ring_handle % TRE_SIZE;
+ tre_ring_shift = TRE_SIZE - tre_ring_shift;
+ lldev->tre_ring_handle += tre_ring_shift;
+ lldev->tre_ring += tre_ring_shift;
+ }
+
+ lldev->evre_ring = dmam_alloc_coherent(dev, (EVRE_SIZE + 1) * nr_tres,
+ &lldev->evre_ring_handle, GFP_KERNEL);
+ if (!lldev->evre_ring)
+ return -ENOMEM;
+
+ memset(lldev->evre_ring, 0, (EVRE_SIZE + 1) * nr_tres);
+ lldev->evre_ring_size = EVRE_SIZE * nr_tres;
+
+ /* the EVRE ring has to be EVRE_SIZE aligned */
+ if (!IS_ALIGNED(lldev->evre_ring_handle, EVRE_SIZE)) {
+ u8 evre_ring_shift;
+
+ evre_ring_shift = lldev->evre_ring_handle % EVRE_SIZE;
+ evre_ring_shift = EVRE_SIZE - evre_ring_shift;
+ lldev->evre_ring_handle += evre_ring_shift;
+ lldev->evre_ring += evre_ring_shift;
+ }
+ lldev->nr_tres = nr_tres;
+ lldev->evridx = evridx;
+
+ rc = hidma_ll_setup(lldev);
+ if (rc)
+ return rc;
+
+ spin_lock_init(&lldev->lock);
+ for (i = 0; i < nr_tres; i++)
+ tasklet_init(&lldev->trepool[i].task, hidma_ll_tre_complete,
+ (unsigned long)&lldev->trepool[i]);
+ lldev->initialized = 1;
+ *lldevp = lldev;
+ hidma_ll_enable_irq(lldev, ENABLE_IRQS);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(hidma_ll_init);
+
+int hidma_ll_uninit(void *llhndl)
+{
+ struct hidma_lldev *lldev = llhndl;
+ int rc = 0;
+ u32 val;
+
+ if (!lldev)
+ return -ENODEV;
+
+ if (lldev->initialized) {
+ u32 required_bytes;
+ u32 i;
+
+ lldev->initialized = 0;
+
+ required_bytes = sizeof(struct hidma_tre) * lldev->nr_tres;
+ for (i = 0; i < lldev->nr_tres; i++)
+ tasklet_kill(&lldev->trepool[i].task);
+ memset(lldev->trepool, 0, required_bytes);
+ lldev->trepool = NULL;
+ lldev->pending_tre_count = 0;
+ lldev->tre_write_offset = 0;
+
+ rc = hidma_ll_reset(lldev);
+
+ /* Clear all pending interrupts again.
+ * Otherwise, we observe reset complete interrupts.
+ */
+ val = readl_relaxed(lldev->evca + EVCA_IRQ_STAT_OFFSET);
+ writel_relaxed(val, lldev->evca + EVCA_IRQ_CLR_OFFSET);
+ hidma_ll_enable_irq(lldev, 0);
+ }
+ return rc;
+}
+EXPORT_SYMBOL_GPL(hidma_ll_uninit);
+
+irqreturn_t hidma_ll_inthandler(int chirq, void *arg)
+{
+ struct hidma_lldev *lldev = arg;
+
+ hidma_ll_int_handler_internal(lldev);
+ return IRQ_HANDLED;
+}
+EXPORT_SYMBOL_GPL(hidma_ll_inthandler);
+
+enum dma_status hidma_ll_status(void *llhndl, u32 tre_ch)
+{
+ struct hidma_lldev *lldev = llhndl;
+ enum dma_status ret = DMA_ERROR;
+ unsigned long flags;
+ u8 err_code;
+
+ spin_lock_irqsave(&lldev->lock, flags);
+ err_code = lldev->tx_status_list[tre_ch].err_code;
+
+ if (err_code & EVRE_STATUS_COMPLETE)
+ ret = DMA_COMPLETE;
+ else if (err_code & EVRE_STATUS_ERROR)
+ ret = DMA_ERROR;
+ else
+ ret = DMA_IN_PROGRESS;
+ spin_unlock_irqrestore(&lldev->lock, flags);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(hidma_ll_status);
+
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+#define HIDMA_CHAN_SHOW(chan, name) \
+ seq_printf(s, #name "=0x%x\n", chan->name)
+
+#define HIDMA_DEVICE_SHOW(device, name) \
+ seq_printf(s, #name "=0x%x\n", device->name)
+
+void hidma_ll_chstats(struct seq_file *s, void *llhndl, u32 tre_ch)
+{
+ struct hidma_lldev *lldev = llhndl;
+ struct hidma_tre *tre;
+ u32 length;
+ dma_addr_t src_start;
+ dma_addr_t dest_start;
+ u32 *tre_local;
+
+ if (unlikely(tre_ch >= lldev->nr_tres)) {
+ dev_err(lldev->dev, "invalid TRE number in chstats:%d",
+ tre_ch);
+ return;
+ }
+ tre = &lldev->trepool[tre_ch];
+ seq_printf(s, "------Channel %d -----\n", tre_ch);
+ seq_printf(s, "allocated=%d\n", atomic_read(&tre->allocated));
+ HIDMA_CHAN_SHOW(tre, queued);
+ seq_printf(s, "err_info=0x%x\n",
+ lldev->tx_status_list[tre->chidx].err_info);
+ seq_printf(s, "err_code=0x%x\n",
+ lldev->tx_status_list[tre->chidx].err_code);
+ HIDMA_CHAN_SHOW(tre, status);
+ HIDMA_CHAN_SHOW(tre, chidx);
+ HIDMA_CHAN_SHOW(tre, dma_sig);
+ seq_printf(s, "dev_name=%s\n", tre->dev_name);
+ seq_printf(s, "callback=%p\n", tre->callback);
+ seq_printf(s, "data=%p\n", tre->data);
+ HIDMA_CHAN_SHOW(tre, tre_index);
+
+ tre_local = &tre->tre_local[0];
+ src_start = tre_local[TRE_SRC_LOW_IDX];
+ src_start = ((u64)(tre_local[TRE_SRC_HI_IDX]) << 32) + src_start;
+ dest_start = tre_local[TRE_DEST_LOW_IDX];
+ dest_start += ((u64)(tre_local[TRE_DEST_HI_IDX]) << 32);
+ length = tre_local[TRE_LEN_IDX];
+
+ seq_printf(s, "src=%pap\n", &src_start);
+ seq_printf(s, "dest=%pap\n", &dest_start);
+ seq_printf(s, "length=0x%x\n", length);
+}
+EXPORT_SYMBOL_GPL(hidma_ll_chstats);
+
+void hidma_ll_devstats(struct seq_file *s, void *llhndl)
+{
+ struct hidma_lldev *lldev = llhndl;
+
+ seq_puts(s, "------Device -----\n");
+ HIDMA_DEVICE_SHOW(lldev, initialized);
+ HIDMA_DEVICE_SHOW(lldev, trch_state);
+ HIDMA_DEVICE_SHOW(lldev, evch_state);
+ HIDMA_DEVICE_SHOW(lldev, evridx);
+ HIDMA_DEVICE_SHOW(lldev, nr_tres);
+ seq_printf(s, "trca=%p\n", lldev->trca);
+ seq_printf(s, "tre_ring=%p\n", lldev->tre_ring);
+ seq_printf(s, "tre_ring_handle=%pap\n", &lldev->tre_ring_handle);
+ HIDMA_DEVICE_SHOW(lldev, tre_ring_size);
+ HIDMA_DEVICE_SHOW(lldev, tre_processed_off);
+ seq_printf(s, "pending_tre_count=%d\n", lldev->pending_tre_count);
+ seq_printf(s, "evca=%p\n", lldev->evca);
+ seq_printf(s, "evre_ring=%p\n", lldev->evre_ring);
+ seq_printf(s, "evre_ring_handle=%pap\n", &lldev->evre_ring_handle);
+ HIDMA_DEVICE_SHOW(lldev, evre_ring_size);
+ HIDMA_DEVICE_SHOW(lldev, evre_processed_off);
+ HIDMA_DEVICE_SHOW(lldev, tre_write_offset);
+}
+EXPORT_SYMBOL_GPL(hidma_ll_devstats);
+#endif
--
Qualcomm Technologies, Inc. on behalf of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project
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