Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted

Pull networking updates from Jakub Kicinski:
 "Core:

   - Add dedicated kmem_cache for typical/small skb->head, avoid having
     to access struct page at kfree time, and improve memory use.

   - Introduce sysctl to set default RPS configuration for new netdevs.

   - Define Netlink protocol specification format which can be used to
     describe messages used by each family and auto-generate parsers.
     Add tools for generating kernel data structures and uAPI headers.

   - Expose all net/core sysctls inside netns.

   - Remove 4s sleep in netpoll if carrier is instantly detected on
     boot.

   - Add configurable limit of MDB entries per port, and port-vlan.

   - Continue populating drop reasons throughout the stack.

   - Retire a handful of legacy Qdiscs and classifiers.

  Protocols:

   - Support IPv4 big TCP (TSO frames larger than 64kB).

   - Add IP_LOCAL_PORT_RANGE socket option, to control local port range
     on socket by socket basis.

   - Track and report in procfs number of MPTCP sockets used.

   - Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
     manager.

   - IPv6: don't check net.ipv6.route.max_size and rely on garbage
     collection to free memory (similarly to IPv4).

   - Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).

   - ICMP: add per-rate limit counters.

   - Add support for user scanning requests in ieee802154.

   - Remove static WEP support.

   - Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
     reporting.

   - WiFi 7 EHT channel puncturing support (client & AP).

  BPF:

   - Add a rbtree data structure following the "next-gen data structure"
     precedent set by recently added linked list, that is, by using
     kfunc + kptr instead of adding a new BPF map type.

   - Expose XDP hints via kfuncs with initial support for RX hash and
     timestamp metadata.

   - Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
     better support decap on GRE tunnel devices not operating in collect
     metadata.

   - Improve x86 JIT's codegen for PROBE_MEM runtime error checks.

   - Remove the need for trace_printk_lock for bpf_trace_printk and
     bpf_trace_vprintk helpers.

   - Extend libbpf's bpf_tracing.h support for tracing arguments of
     kprobes/uprobes and syscall as a special case.

   - Significantly reduce the search time for module symbols by
     livepatch and BPF.

   - Enable cpumasks to be used as kptrs, which is useful for tracing
     programs tracking which tasks end up running on which CPUs in
     different time intervals.

   - Add support for BPF trampoline on s390x and riscv64.

   - Add capability to export the XDP features supported by the NIC.

   - Add __bpf_kfunc tag for marking kernel functions as kfuncs.

   - Add cgroup.memory=nobpf kernel parameter option to disable BPF
     memory accounting for container environments.

  Netfilter:

   - Remove the CLUSTERIP target. It has been marked as obsolete for
     years, and we still have WARN splats wrt races of the out-of-band
     /proc interface installed by this target.

   - Add 'destroy' commands to nf_tables. They are identical to the
     existing 'delete' commands, but do not return an error if the
     referenced object (set, chain, rule...) did not exist.

  Driver API:

   - Improve cpumask_local_spread() locality to help NICs set the right
     IRQ affinity on AMD platforms.

   - Separate C22 and C45 MDIO bus transactions more clearly.

   - Introduce new DCB table to control DSCP rewrite on egress.

   - Support configuration of Physical Layer Collision Avoidance (PLCA)
     Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
     shared medium Ethernet.

   - Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
     preemption of low priority frames by high priority frames.

   - Add support for controlling MACSec offload using netlink SET.

   - Rework devlink instance refcounts to allow registration and
     de-registration under the instance lock. Split the code into
     multiple files, drop some of the unnecessarily granular locks and
     factor out common parts of netlink operation handling.

   - Add TX frame aggregation parameters (for USB drivers).

   - Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
     messages with notifications for debug.

   - Allow offloading of UDP NEW connections via act_ct.

   - Add support for per action HW stats in TC.

   - Support hardware miss to TC action (continue processing in SW from
     a specific point in the action chain).

   - Warn if old Wireless Extension user space interface is used with
     modern cfg80211/mac80211 drivers. Do not support Wireless
     Extensions for Wi-Fi 7 devices at all. Everyone should switch to
     using nl80211 interface instead.

   - Improve the CAN bit timing configuration. Use extack to return
     error messages directly to user space, update the SJW handling,
     including the definition of a new default value that will benefit
     CAN-FD controllers, by increasing their oscillator tolerance.

  New hardware / drivers:

   - Ethernet:
      - nVidia BlueField-3 support (control traffic driver)
      - Ethernet support for imx93 SoCs
      - Motorcomm yt8531 gigabit Ethernet PHY
      - onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
      - Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
      - Amlogic gxl MDIO mux

   - WiFi:
      - RealTek RTL8188EU (rtl8xxxu)
      - Qualcomm Wi-Fi 7 devices (ath12k)

   - CAN:
      - Renesas R-Car V4H

  Drivers:

   - Bluetooth:
      - Set Per Platform Antenna Gain (PPAG) for Intel controllers.

   - Ethernet NICs:
      - Intel (1G, igc):
         - support TSN / Qbv / packet scheduling features of i226 model
      - Intel (100G, ice):
         - use GNSS subsystem instead of TTY
         - multi-buffer XDP support
         - extend support for GPIO pins to E823 devices
      - nVidia/Mellanox:
         - update the shared buffer configuration on PFC commands
         - implement PTP adjphase function for HW offset control
         - TC support for Geneve and GRE with VF tunnel offload
         - more efficient crypto key management method
         - multi-port eswitch support
      - Netronome/Corigine:
         - add DCB IEEE support
         - support IPsec offloading for NFP3800
      - Freescale/NXP (enetc):
         - support XDP_REDIRECT for XDP non-linear buffers
         - improve reconfig, avoid link flap and waiting for idle
         - support MAC Merge layer
      - Other NICs:
         - sfc/ef100: add basic devlink support for ef100
         - ionic: rx_push mode operation (writing descriptors via MMIO)
         - bnxt: use the auxiliary bus abstraction for RDMA
         - r8169: disable ASPM and reset bus in case of tx timeout
         - cpsw: support QSGMII mode for J721e CPSW9G
         - cpts: support pulse-per-second output
         - ngbe: add an mdio bus driver
         - usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
         - r8152: handle devices with FW with NCM support
         - amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
         - virtio-net: support multi buffer XDP
         - virtio/vsock: replace virtio_vsock_pkt with sk_buff
         - tsnep: XDP support

   - Ethernet high-speed switches:
      - nVidia/Mellanox (mlxsw):
         - add support for latency TLV (in FW control messages)
      - Microchip (sparx5):
         - separate explicit and implicit traffic forwarding rules, make
           the implicit rules always active
         - add support for egress DSCP rewrite
         - IS0 VCAP support (Ingress Classification)
         - IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
           etc.)
         - ES2 VCAP support (Egress Access Control)
         - support for Per-Stream Filtering and Policing (802.1Q,
           8.6.5.1)

   - Ethernet embedded switches:
      - Marvell (mv88e6xxx):
         - add MAB (port auth) offload support
         - enable PTP receive for mv88e6390
      - NXP (ocelot):
         - support MAC Merge layer
         - support for the the vsc7512 internal copper phys
      - Microchip:
         - lan9303: convert to PHYLINK
         - lan966x: support TC flower filter statistics
         - lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
         - lan937x: support Credit Based Shaper configuration
         - ksz9477: support Energy Efficient Ethernet
      - other:
         - qca8k: convert to regmap read/write API, use bulk operations
         - rswitch: Improve TX timestamp accuracy

   - Intel WiFi (iwlwifi):
      - EHT (Wi-Fi 7) rate reporting
      - STEP equalizer support: transfer some STEP (connection to radio
        on platforms with integrated wifi) related parameters from the
        BIOS to the firmware.

   - Qualcomm 802.11ax WiFi (ath11k):
      - IPQ5018 support
      - Fine Timing Measurement (FTM) responder role support
      - channel 177 support

   - MediaTek WiFi (mt76):
      - per-PHY LED support
      - mt7996: EHT (Wi-Fi 7) support
      - Wireless Ethernet Dispatch (WED) reset support
      - switch to using page pool allocator

   - RealTek WiFi (rtw89):
      - support new version of Bluetooth co-existance

   - Mobile:
      - rmnet: support TX aggregation"

* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
  page_pool: add a comment explaining the fragment counter usage
  net: ethtool: fix __ethtool_dev_mm_supported() implementation
  ethtool: pse-pd: Fix double word in comments
  xsk: add linux/vmalloc.h to xsk.c
  sefltests: netdevsim: wait for devlink instance after netns removal
  selftest: fib_tests: Always cleanup before exit
  net/mlx5e: Align IPsec ASO result memory to be as required by hardware
  net/mlx5e: TC, Set CT miss to the specific ct action instance
  net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
  net/mlx5: Refactor tc miss handling to a single function
  net/mlx5: Kconfig: Make tc offload depend on tc skb extension
  net/sched: flower: Support hardware miss to tc action
  net/sched: flower: Move filter handle initialization earlier
  net/sched: cls_api: Support hardware miss to tc action
  net/sched: Rename user cookie and act cookie
  sfc: fix builds without CONFIG_RTC_LIB
  sfc: clean up some inconsistent indentings
  net/mlx4_en: Introduce flexible array to silence overflow warning
  net: lan966x: Fix possible deadlock inside PTP
  net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
  ...

1 files changed, 497 insertions, 0 deletions

diff --git a/sound/soc/sprd/sprd-pcm-dma.c b/sound/soc/sprd/sprd-pcm-dma.c
new file mode 100644
index 000000000..48d90616b
--- /dev/null
+++ b/sound/soc/sprd/sprd-pcm-dma.c
@@ -0,0 +1,497 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2019 Spreadtrum Communications Inc.
+
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+#include <linux/dma/sprd-dma.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_reserved_mem.h>
+#include <linux/platform_device.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include "sprd-pcm-dma.h"
+
+#define SPRD_PCM_DMA_LINKLIST_SIZE	64
+#define SPRD_PCM_DMA_BRUST_LEN		640
+
+struct sprd_pcm_dma_data {
+	struct dma_chan *chan;
+	struct dma_async_tx_descriptor *desc;
+	dma_cookie_t cookie;
+	dma_addr_t phys;
+	void *virt;
+	int pre_pointer;
+};
+
+struct sprd_pcm_dma_private {
+	struct snd_pcm_substream *substream;
+	struct sprd_pcm_dma_params *params;
+	struct sprd_pcm_dma_data data[SPRD_PCM_CHANNEL_MAX];
+	int hw_chan;
+	int dma_addr_offset;
+};
+
+static const struct snd_pcm_hardware sprd_pcm_hardware = {
+	.info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID |
+		SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_PAUSE |
+		SNDRV_PCM_INFO_RESUME | SNDRV_PCM_INFO_NO_PERIOD_WAKEUP,
+	.formats = SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S24_LE,
+	.period_bytes_min = 1,
+	.period_bytes_max = 64 * 1024,
+	.periods_min = 1,
+	.periods_max = PAGE_SIZE / SPRD_PCM_DMA_LINKLIST_SIZE,
+	.buffer_bytes_max = 64 * 1024,
+};
+
+static int sprd_pcm_open(struct snd_soc_component *component,
+			 struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct device *dev = component->dev;
+	struct sprd_pcm_dma_private *dma_private;
+	int hw_chan = SPRD_PCM_CHANNEL_MAX;
+	int size, ret, i;
+
+	snd_soc_set_runtime_hwparams(substream, &sprd_pcm_hardware);
+
+	ret = snd_pcm_hw_constraint_step(runtime, 0,
+					 SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
+					 SPRD_PCM_DMA_BRUST_LEN);
+	if (ret < 0)
+		return ret;
+
+	ret = snd_pcm_hw_constraint_step(runtime, 0,
+					 SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
+					 SPRD_PCM_DMA_BRUST_LEN);
+	if (ret < 0)
+		return ret;
+
+	ret = snd_pcm_hw_constraint_integer(runtime,
+					    SNDRV_PCM_HW_PARAM_PERIODS);
+	if (ret < 0)
+		return ret;
+
+	dma_private = devm_kzalloc(dev, sizeof(*dma_private), GFP_KERNEL);
+	if (!dma_private)
+		return -ENOMEM;
+
+	size = runtime->hw.periods_max * SPRD_PCM_DMA_LINKLIST_SIZE;
+
+	for (i = 0; i < hw_chan; i++) {
+		struct sprd_pcm_dma_data *data = &dma_private->data[i];
+
+		data->virt = dmam_alloc_coherent(dev, size, &data->phys,
+						 GFP_KERNEL);
+		if (!data->virt) {
+			ret = -ENOMEM;
+			goto error;
+		}
+	}
+
+	dma_private->hw_chan = hw_chan;
+	runtime->private_data = dma_private;
+	dma_private->substream = substream;
+
+	return 0;
+
+error:
+	for (i = 0; i < hw_chan; i++) {
+		struct sprd_pcm_dma_data *data = &dma_private->data[i];
+
+		if (data->virt)
+			dmam_free_coherent(dev, size, data->virt, data->phys);
+	}
+
+	devm_kfree(dev, dma_private);
+	return ret;
+}
+
+static int sprd_pcm_close(struct snd_soc_component *component,
+			  struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct sprd_pcm_dma_private *dma_private = runtime->private_data;
+	struct device *dev = component->dev;
+	int size = runtime->hw.periods_max * SPRD_PCM_DMA_LINKLIST_SIZE;
+	int i;
+
+	for (i = 0; i < dma_private->hw_chan; i++) {
+		struct sprd_pcm_dma_data *data = &dma_private->data[i];
+
+		dmam_free_coherent(dev, size, data->virt, data->phys);
+	}
+
+	devm_kfree(dev, dma_private);
+
+	return 0;
+}
+
+static void sprd_pcm_dma_complete(void *data)
+{
+	struct sprd_pcm_dma_private *dma_private = data;
+	struct snd_pcm_substream *substream = dma_private->substream;
+
+	snd_pcm_period_elapsed(substream);
+}
+
+static void sprd_pcm_release_dma_channel(struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct sprd_pcm_dma_private *dma_private = runtime->private_data;
+	int i;
+
+	for (i = 0; i < SPRD_PCM_CHANNEL_MAX; i++) {
+		struct sprd_pcm_dma_data *data = &dma_private->data[i];
+
+		if (data->chan) {
+			dma_release_channel(data->chan);
+			data->chan = NULL;
+		}
+	}
+}
+
+static int sprd_pcm_request_dma_channel(struct snd_soc_component *component,
+					struct snd_pcm_substream *substream,
+					int channels)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct sprd_pcm_dma_private *dma_private = runtime->private_data;
+	struct device *dev = component->dev;
+	struct sprd_pcm_dma_params *dma_params = dma_private->params;
+	int i;
+
+	if (channels > SPRD_PCM_CHANNEL_MAX) {
+		dev_err(dev, "invalid dma channel number:%d\n", channels);
+		return -EINVAL;
+	}
+
+	for (i = 0; i < channels; i++) {
+		struct sprd_pcm_dma_data *data = &dma_private->data[i];
+
+		data->chan = dma_request_slave_channel(dev,
+						       dma_params->chan_name[i]);
+		if (!data->chan) {
+			dev_err(dev, "failed to request dma channel:%s\n",
+				dma_params->chan_name[i]);
+			sprd_pcm_release_dma_channel(substream);
+			return -ENODEV;
+		}
+	}
+
+	return 0;
+}
+
+static int sprd_pcm_hw_params(struct snd_soc_component *component,
+			      struct snd_pcm_substream *substream,
+			      struct snd_pcm_hw_params *params)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct sprd_pcm_dma_private *dma_private = runtime->private_data;
+	struct snd_soc_pcm_runtime *rtd = asoc_substream_to_rtd(substream);
+	struct sprd_pcm_dma_params *dma_params;
+	size_t totsize = params_buffer_bytes(params);
+	size_t period = params_period_bytes(params);
+	int channels = params_channels(params);
+	int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
+	struct scatterlist *sg;
+	unsigned long flags;
+	int ret, i, j, sg_num;
+
+	dma_params = snd_soc_dai_get_dma_data(asoc_rtd_to_cpu(rtd, 0), substream);
+	if (!dma_params) {
+		dev_warn(component->dev, "no dma parameters setting\n");
+		dma_private->params = NULL;
+		return 0;
+	}
+
+	if (!dma_private->params) {
+		dma_private->params = dma_params;
+		ret = sprd_pcm_request_dma_channel(component,
+						   substream, channels);
+		if (ret)
+			return ret;
+	}
+
+	sg_num = totsize / period;
+	dma_private->dma_addr_offset = totsize / channels;
+
+	sg = devm_kcalloc(component->dev, sg_num, sizeof(*sg), GFP_KERNEL);
+	if (!sg) {
+		ret = -ENOMEM;
+		goto sg_err;
+	}
+
+	for (i = 0; i < channels; i++) {
+		struct sprd_pcm_dma_data *data = &dma_private->data[i];
+		struct dma_chan *chan = data->chan;
+		struct dma_slave_config config = { };
+		struct sprd_dma_linklist link = { };
+		enum dma_transfer_direction dir;
+		struct scatterlist *sgt = sg;
+
+		config.src_maxburst = dma_params->fragment_len[i];
+		config.src_addr_width = dma_params->datawidth[i];
+		config.dst_addr_width = dma_params->datawidth[i];
+		if (is_playback) {
+			config.src_addr = runtime->dma_addr +
+				i * dma_private->dma_addr_offset;
+			config.dst_addr = dma_params->dev_phys[i];
+			dir = DMA_MEM_TO_DEV;
+		} else {
+			config.src_addr = dma_params->dev_phys[i];
+			config.dst_addr = runtime->dma_addr +
+				i * dma_private->dma_addr_offset;
+			dir = DMA_DEV_TO_MEM;
+		}
+
+		sg_init_table(sgt, sg_num);
+		for (j = 0; j < sg_num; j++, sgt++) {
+			u32 sg_len = period / channels;
+
+			sg_dma_len(sgt) = sg_len;
+			sg_dma_address(sgt) = runtime->dma_addr +
+				i * dma_private->dma_addr_offset + sg_len * j;
+		}
+
+		/*
+		 * Configure the link-list address for the DMA engine link-list
+		 * mode.
+		 */
+		link.virt_addr = (unsigned long)data->virt;
+		link.phy_addr = data->phys;
+
+		ret = dmaengine_slave_config(chan, &config);
+		if (ret) {
+			dev_err(component->dev,
+				"failed to set slave configuration: %d\n", ret);
+			goto config_err;
+		}
+
+		/*
+		 * We configure the DMA request mode, interrupt mode, channel
+		 * mode and channel trigger mode by the flags.
+		 */
+		flags = SPRD_DMA_FLAGS(SPRD_DMA_CHN_MODE_NONE, SPRD_DMA_NO_TRG,
+				       SPRD_DMA_FRAG_REQ, SPRD_DMA_TRANS_INT);
+		data->desc = chan->device->device_prep_slave_sg(chan, sg,
+								sg_num, dir,
+								flags, &link);
+		if (!data->desc) {
+			dev_err(component->dev, "failed to prepare slave sg\n");
+			ret = -ENOMEM;
+			goto config_err;
+		}
+
+		if (!runtime->no_period_wakeup) {
+			data->desc->callback = sprd_pcm_dma_complete;
+			data->desc->callback_param = dma_private;
+		}
+	}
+
+	devm_kfree(component->dev, sg);
+
+	return 0;
+
+config_err:
+	devm_kfree(component->dev, sg);
+sg_err:
+	sprd_pcm_release_dma_channel(substream);
+	return ret;
+}
+
+static int sprd_pcm_hw_free(struct snd_soc_component *component,
+			    struct snd_pcm_substream *substream)
+{
+	sprd_pcm_release_dma_channel(substream);
+
+	return 0;
+}
+
+static int sprd_pcm_trigger(struct snd_soc_component *component,
+			    struct snd_pcm_substream *substream, int cmd)
+{
+	struct sprd_pcm_dma_private *dma_private =
+		substream->runtime->private_data;
+	int ret = 0, i;
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		for (i = 0; i < dma_private->hw_chan; i++) {
+			struct sprd_pcm_dma_data *data = &dma_private->data[i];
+
+			if (!data->desc)
+				continue;
+
+			data->cookie = dmaengine_submit(data->desc);
+			ret = dma_submit_error(data->cookie);
+			if (ret) {
+				dev_err(component->dev,
+					"failed to submit dma request: %d\n",
+					ret);
+				return ret;
+			}
+
+			dma_async_issue_pending(data->chan);
+		}
+
+		break;
+	case SNDRV_PCM_TRIGGER_RESUME:
+	case SNDRV_PCM_TRIGGER_PAUSE_RELEASE:
+		for (i = 0; i < dma_private->hw_chan; i++) {
+			struct sprd_pcm_dma_data *data = &dma_private->data[i];
+
+			if (data->chan)
+				dmaengine_resume(data->chan);
+		}
+
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+		for (i = 0; i < dma_private->hw_chan; i++) {
+			struct sprd_pcm_dma_data *data = &dma_private->data[i];
+
+			if (data->chan)
+				dmaengine_terminate_async(data->chan);
+		}
+
+		break;
+	case SNDRV_PCM_TRIGGER_SUSPEND:
+	case SNDRV_PCM_TRIGGER_PAUSE_PUSH:
+		for (i = 0; i < dma_private->hw_chan; i++) {
+			struct sprd_pcm_dma_data *data = &dma_private->data[i];
+
+			if (data->chan)
+				dmaengine_pause(data->chan);
+		}
+
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static snd_pcm_uframes_t sprd_pcm_pointer(struct snd_soc_component *component,
+					  struct snd_pcm_substream *substream)
+{
+	struct snd_pcm_runtime *runtime = substream->runtime;
+	struct sprd_pcm_dma_private *dma_private = runtime->private_data;
+	int pointer[SPRD_PCM_CHANNEL_MAX];
+	int bytes_of_pointer = 0, sel_max = 0, i;
+	snd_pcm_uframes_t x;
+	struct dma_tx_state state;
+	enum dma_status status;
+
+	for (i = 0; i < dma_private->hw_chan; i++) {
+		struct sprd_pcm_dma_data *data = &dma_private->data[i];
+
+		if (!data->chan)
+			continue;
+
+		status = dmaengine_tx_status(data->chan, data->cookie, &state);
+		if (status == DMA_ERROR) {
+			dev_err(component->dev,
+				"failed to get dma channel %d status\n", i);
+			return 0;
+		}
+
+		/*
+		 * We just get current transfer address from the DMA engine, so
+		 * we need convert to current pointer.
+		 */
+		pointer[i] = state.residue - runtime->dma_addr -
+			i * dma_private->dma_addr_offset;
+
+		if (i == 0) {
+			bytes_of_pointer = pointer[i];
+			sel_max = pointer[i] < data->pre_pointer ? 1 : 0;
+		} else {
+			sel_max ^= pointer[i] < data->pre_pointer ? 1 : 0;
+
+			if (sel_max)
+				bytes_of_pointer =
+					max(pointer[i], pointer[i - 1]) << 1;
+			else
+				bytes_of_pointer =
+					min(pointer[i], pointer[i - 1]) << 1;
+		}
+
+		data->pre_pointer = pointer[i];
+	}
+
+	x = bytes_to_frames(runtime, bytes_of_pointer);
+	if (x == runtime->buffer_size)
+		x = 0;
+
+	return x;
+}
+
+static int sprd_pcm_new(struct snd_soc_component *component,
+			struct snd_soc_pcm_runtime *rtd)
+{
+	struct snd_card *card = rtd->card->snd_card;
+	struct snd_pcm *pcm = rtd->pcm;
+	int ret;
+
+	ret = dma_coerce_mask_and_coherent(card->dev, DMA_BIT_MASK(32));
+	if (ret)
+		return ret;
+
+	return snd_pcm_set_fixed_buffer_all(pcm, SNDRV_DMA_TYPE_DEV,
+					    card->dev,
+					    sprd_pcm_hardware.buffer_bytes_max);
+}
+
+static const struct snd_soc_component_driver sprd_soc_component = {
+	.name		= DRV_NAME,
+	.open		= sprd_pcm_open,
+	.close		= sprd_pcm_close,
+	.hw_params	= sprd_pcm_hw_params,
+	.hw_free	= sprd_pcm_hw_free,
+	.trigger	= sprd_pcm_trigger,
+	.pointer	= sprd_pcm_pointer,
+	.pcm_construct	= sprd_pcm_new,
+	.compress_ops	= &sprd_platform_compress_ops,
+};
+
+static int sprd_soc_platform_probe(struct platform_device *pdev)
+{
+	struct device_node *np = pdev->dev.of_node;
+	int ret;
+
+	ret = of_reserved_mem_device_init_by_idx(&pdev->dev, np, 0);
+	if (ret)
+		dev_warn(&pdev->dev,
+			 "no reserved DMA memory for audio platform device\n");
+
+	ret = devm_snd_soc_register_component(&pdev->dev, &sprd_soc_component,
+					      NULL, 0);
+	if (ret)
+		dev_err(&pdev->dev, "could not register platform:%d\n", ret);
+
+	return ret;
+}
+
+static const struct of_device_id sprd_pcm_of_match[] = {
+	{ .compatible = "sprd,pcm-platform", },
+	{ },
+};
+MODULE_DEVICE_TABLE(of, sprd_pcm_of_match);
+
+static struct platform_driver sprd_pcm_driver = {
+	.driver = {
+		.name = "sprd-pcm-audio",
+		.of_match_table = sprd_pcm_of_match,
+	},
+
+	.probe = sprd_soc_platform_probe,
+};
+
+module_platform_driver(sprd_pcm_driver);
+
+MODULE_DESCRIPTION("Spreadtrum ASoC PCM DMA");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:sprd-audio");