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, 553 insertions, 0 deletions

diff --git a/sound/soc/sh/siu_pcm.c b/sound/soc/sh/siu_pcm.c
new file mode 100644
index 000000000..f15ff36e7
--- /dev/null
+++ b/sound/soc/sh/siu_pcm.c
@@ -0,0 +1,553 @@
+// SPDX-License-Identifier: GPL-2.0+
+//
+// siu_pcm.c - ALSA driver for Renesas SH7343, SH7722 SIU peripheral.
+//
+// Copyright (C) 2009-2010 Guennadi Liakhovetski <g.liakhovetski@gmx.de>
+// Copyright (C) 2006 Carlos Munoz <carlos@kenati.com>
+
+#include <linux/delay.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+
+#include <sound/control.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+
+#include <asm/siu.h>
+
+#include "siu.h"
+
+#define DRV_NAME "siu-i2s"
+#define GET_MAX_PERIODS(buf_bytes, period_bytes) \
+				((buf_bytes) / (period_bytes))
+#define PERIOD_OFFSET(buf_addr, period_num, period_bytes) \
+				((buf_addr) + ((period_num) * (period_bytes)))
+
+#define RWF_STM_RD		0x01		/* Read in progress */
+#define RWF_STM_WT		0x02		/* Write in progress */
+
+struct siu_port *siu_ports[SIU_PORT_NUM];
+
+/* transfersize is number of u32 dma transfers per period */
+static int siu_pcm_stmwrite_stop(struct siu_port *port_info)
+{
+	struct siu_info *info = siu_i2s_data;
+	u32 __iomem *base = info->reg;
+	struct siu_stream *siu_stream = &port_info->playback;
+	u32 stfifo;
+
+	if (!siu_stream->rw_flg)
+		return -EPERM;
+
+	/* output FIFO disable */
+	stfifo = siu_read32(base + SIU_STFIFO);
+	siu_write32(base + SIU_STFIFO, stfifo & ~0x0c180c18);
+	pr_debug("%s: STFIFO %x -> %x\n", __func__,
+		 stfifo, stfifo & ~0x0c180c18);
+
+	/* during stmwrite clear */
+	siu_stream->rw_flg = 0;
+
+	return 0;
+}
+
+static int siu_pcm_stmwrite_start(struct siu_port *port_info)
+{
+	struct siu_stream *siu_stream = &port_info->playback;
+
+	if (siu_stream->rw_flg)
+		return -EPERM;
+
+	/* Current period in buffer */
+	port_info->playback.cur_period = 0;
+
+	/* during stmwrite flag set */
+	siu_stream->rw_flg = RWF_STM_WT;
+
+	/* DMA transfer start */
+	queue_work(system_highpri_wq, &siu_stream->work);
+
+	return 0;
+}
+
+static void siu_dma_tx_complete(void *arg)
+{
+	struct siu_stream *siu_stream = arg;
+
+	if (!siu_stream->rw_flg)
+		return;
+
+	/* Update completed period count */
+	if (++siu_stream->cur_period >=
+	    GET_MAX_PERIODS(siu_stream->buf_bytes,
+			    siu_stream->period_bytes))
+		siu_stream->cur_period = 0;
+
+	pr_debug("%s: done period #%d (%u/%u bytes), cookie %d\n",
+		__func__, siu_stream->cur_period,
+		siu_stream->cur_period * siu_stream->period_bytes,
+		siu_stream->buf_bytes, siu_stream->cookie);
+
+	queue_work(system_highpri_wq, &siu_stream->work);
+
+	/* Notify alsa: a period is done */
+	snd_pcm_period_elapsed(siu_stream->substream);
+}
+
+static int siu_pcm_wr_set(struct siu_port *port_info,
+			  dma_addr_t buff, u32 size)
+{
+	struct siu_info *info = siu_i2s_data;
+	u32 __iomem *base = info->reg;
+	struct siu_stream *siu_stream = &port_info->playback;
+	struct snd_pcm_substream *substream = siu_stream->substream;
+	struct device *dev = substream->pcm->card->dev;
+	struct dma_async_tx_descriptor *desc;
+	dma_cookie_t cookie;
+	struct scatterlist sg;
+	u32 stfifo;
+
+	sg_init_table(&sg, 1);
+	sg_set_page(&sg, pfn_to_page(PFN_DOWN(buff)),
+		    size, offset_in_page(buff));
+	sg_dma_len(&sg) = size;
+	sg_dma_address(&sg) = buff;
+
+	desc = dmaengine_prep_slave_sg(siu_stream->chan,
+		&sg, 1, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+	if (!desc) {
+		dev_err(dev, "Failed to allocate a dma descriptor\n");
+		return -ENOMEM;
+	}
+
+	desc->callback = siu_dma_tx_complete;
+	desc->callback_param = siu_stream;
+	cookie = dmaengine_submit(desc);
+	if (cookie < 0) {
+		dev_err(dev, "Failed to submit a dma transfer\n");
+		return cookie;
+	}
+
+	siu_stream->tx_desc = desc;
+	siu_stream->cookie = cookie;
+
+	dma_async_issue_pending(siu_stream->chan);
+
+	/* only output FIFO enable */
+	stfifo = siu_read32(base + SIU_STFIFO);
+	siu_write32(base + SIU_STFIFO, stfifo | (port_info->stfifo & 0x0c180c18));
+	dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
+		stfifo, stfifo | (port_info->stfifo & 0x0c180c18));
+
+	return 0;
+}
+
+static int siu_pcm_rd_set(struct siu_port *port_info,
+			  dma_addr_t buff, size_t size)
+{
+	struct siu_info *info = siu_i2s_data;
+	u32 __iomem *base = info->reg;
+	struct siu_stream *siu_stream = &port_info->capture;
+	struct snd_pcm_substream *substream = siu_stream->substream;
+	struct device *dev = substream->pcm->card->dev;
+	struct dma_async_tx_descriptor *desc;
+	dma_cookie_t cookie;
+	struct scatterlist sg;
+	u32 stfifo;
+
+	dev_dbg(dev, "%s: %u@%llx\n", __func__, size, (unsigned long long)buff);
+
+	sg_init_table(&sg, 1);
+	sg_set_page(&sg, pfn_to_page(PFN_DOWN(buff)),
+		    size, offset_in_page(buff));
+	sg_dma_len(&sg) = size;
+	sg_dma_address(&sg) = buff;
+
+	desc = dmaengine_prep_slave_sg(siu_stream->chan,
+		&sg, 1, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | DMA_CTRL_ACK);
+	if (!desc) {
+		dev_err(dev, "Failed to allocate dma descriptor\n");
+		return -ENOMEM;
+	}
+
+	desc->callback = siu_dma_tx_complete;
+	desc->callback_param = siu_stream;
+	cookie = dmaengine_submit(desc);
+	if (cookie < 0) {
+		dev_err(dev, "Failed to submit dma descriptor\n");
+		return cookie;
+	}
+
+	siu_stream->tx_desc = desc;
+	siu_stream->cookie = cookie;
+
+	dma_async_issue_pending(siu_stream->chan);
+
+	/* only input FIFO enable */
+	stfifo = siu_read32(base + SIU_STFIFO);
+	siu_write32(base + SIU_STFIFO, siu_read32(base + SIU_STFIFO) |
+		    (port_info->stfifo & 0x13071307));
+	dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
+		stfifo, stfifo | (port_info->stfifo & 0x13071307));
+
+	return 0;
+}
+
+static void siu_io_work(struct work_struct *work)
+{
+	struct siu_stream *siu_stream = container_of(work, struct siu_stream,
+						     work);
+	struct snd_pcm_substream *substream = siu_stream->substream;
+	struct device *dev = substream->pcm->card->dev;
+	struct snd_pcm_runtime *rt = substream->runtime;
+	struct siu_port *port_info = siu_port_info(substream);
+
+	dev_dbg(dev, "%s: flags %x\n", __func__, siu_stream->rw_flg);
+
+	if (!siu_stream->rw_flg) {
+		dev_dbg(dev, "%s: stream inactive\n", __func__);
+		return;
+	}
+
+	if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
+		dma_addr_t buff;
+		size_t count;
+
+		buff = (dma_addr_t)PERIOD_OFFSET(rt->dma_addr,
+						siu_stream->cur_period,
+						siu_stream->period_bytes);
+		count = siu_stream->period_bytes;
+
+		/* DMA transfer start */
+		siu_pcm_rd_set(port_info, buff, count);
+	} else {
+		siu_pcm_wr_set(port_info,
+			       (dma_addr_t)PERIOD_OFFSET(rt->dma_addr,
+						siu_stream->cur_period,
+						siu_stream->period_bytes),
+			       siu_stream->period_bytes);
+	}
+}
+
+/* Capture */
+static int siu_pcm_stmread_start(struct siu_port *port_info)
+{
+	struct siu_stream *siu_stream = &port_info->capture;
+
+	if (siu_stream->xfer_cnt > 0x1000000)
+		return -EINVAL;
+	if (siu_stream->rw_flg)
+		return -EPERM;
+
+	/* Current period in buffer */
+	siu_stream->cur_period = 0;
+
+	/* during stmread flag set */
+	siu_stream->rw_flg = RWF_STM_RD;
+
+	queue_work(system_highpri_wq, &siu_stream->work);
+
+	return 0;
+}
+
+static int siu_pcm_stmread_stop(struct siu_port *port_info)
+{
+	struct siu_info *info = siu_i2s_data;
+	u32 __iomem *base = info->reg;
+	struct siu_stream *siu_stream = &port_info->capture;
+	struct device *dev = siu_stream->substream->pcm->card->dev;
+	u32 stfifo;
+
+	if (!siu_stream->rw_flg)
+		return -EPERM;
+
+	/* input FIFO disable */
+	stfifo = siu_read32(base + SIU_STFIFO);
+	siu_write32(base + SIU_STFIFO, stfifo & ~0x13071307);
+	dev_dbg(dev, "%s: STFIFO %x -> %x\n", __func__,
+		stfifo, stfifo & ~0x13071307);
+
+	/* during stmread flag clear */
+	siu_stream->rw_flg = 0;
+
+	return 0;
+}
+
+static bool filter(struct dma_chan *chan, void *secondary)
+{
+	struct sh_dmae_slave *param = secondary;
+
+	pr_debug("%s: secondary ID %d\n", __func__, param->shdma_slave.slave_id);
+
+	chan->private = &param->shdma_slave;
+	return true;
+}
+
+static int siu_pcm_open(struct snd_soc_component *component,
+			struct snd_pcm_substream *ss)
+{
+	/* Playback / Capture */
+	struct siu_platform *pdata = component->dev->platform_data;
+	struct siu_info *info = siu_i2s_data;
+	struct siu_port *port_info = siu_port_info(ss);
+	struct siu_stream *siu_stream;
+	u32 port = info->port_id;
+	struct device *dev = ss->pcm->card->dev;
+	dma_cap_mask_t mask;
+	struct sh_dmae_slave *param;
+
+	dma_cap_zero(mask);
+	dma_cap_set(DMA_SLAVE, mask);
+
+	dev_dbg(dev, "%s, port=%d@%p\n", __func__, port, port_info);
+
+	if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		siu_stream = &port_info->playback;
+		param = &siu_stream->param;
+		param->shdma_slave.slave_id = port ? pdata->dma_slave_tx_b :
+			pdata->dma_slave_tx_a;
+	} else {
+		siu_stream = &port_info->capture;
+		param = &siu_stream->param;
+		param->shdma_slave.slave_id = port ? pdata->dma_slave_rx_b :
+			pdata->dma_slave_rx_a;
+	}
+
+	/* Get DMA channel */
+	siu_stream->chan = dma_request_channel(mask, filter, param);
+	if (!siu_stream->chan) {
+		dev_err(dev, "DMA channel allocation failed!\n");
+		return -EBUSY;
+	}
+
+	siu_stream->substream = ss;
+
+	return 0;
+}
+
+static int siu_pcm_close(struct snd_soc_component *component,
+			 struct snd_pcm_substream *ss)
+{
+	struct siu_info *info = siu_i2s_data;
+	struct device *dev = ss->pcm->card->dev;
+	struct siu_port *port_info = siu_port_info(ss);
+	struct siu_stream *siu_stream;
+
+	dev_dbg(dev, "%s: port=%d\n", __func__, info->port_id);
+
+	if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		siu_stream = &port_info->playback;
+	else
+		siu_stream = &port_info->capture;
+
+	dma_release_channel(siu_stream->chan);
+	siu_stream->chan = NULL;
+
+	siu_stream->substream = NULL;
+
+	return 0;
+}
+
+static int siu_pcm_prepare(struct snd_soc_component *component,
+			   struct snd_pcm_substream *ss)
+{
+	struct siu_info *info = siu_i2s_data;
+	struct siu_port *port_info = siu_port_info(ss);
+	struct device *dev = ss->pcm->card->dev;
+	struct snd_pcm_runtime *rt;
+	struct siu_stream *siu_stream;
+	snd_pcm_sframes_t xfer_cnt;
+
+	if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		siu_stream = &port_info->playback;
+	else
+		siu_stream = &port_info->capture;
+
+	rt = siu_stream->substream->runtime;
+
+	siu_stream->buf_bytes = snd_pcm_lib_buffer_bytes(ss);
+	siu_stream->period_bytes = snd_pcm_lib_period_bytes(ss);
+
+	dev_dbg(dev, "%s: port=%d, %d channels, period=%u bytes\n", __func__,
+		info->port_id, rt->channels, siu_stream->period_bytes);
+
+	/* We only support buffers that are multiples of the period */
+	if (siu_stream->buf_bytes % siu_stream->period_bytes) {
+		dev_err(dev, "%s() - buffer=%d not multiple of period=%d\n",
+		       __func__, siu_stream->buf_bytes,
+		       siu_stream->period_bytes);
+		return -EINVAL;
+	}
+
+	xfer_cnt = bytes_to_frames(rt, siu_stream->period_bytes);
+	if (!xfer_cnt || xfer_cnt > 0x1000000)
+		return -EINVAL;
+
+	siu_stream->format = rt->format;
+	siu_stream->xfer_cnt = xfer_cnt;
+
+	dev_dbg(dev, "port=%d buf=%lx buf_bytes=%d period_bytes=%d "
+		"format=%d channels=%d xfer_cnt=%d\n", info->port_id,
+		(unsigned long)rt->dma_addr, siu_stream->buf_bytes,
+		siu_stream->period_bytes,
+		siu_stream->format, rt->channels, (int)xfer_cnt);
+
+	return 0;
+}
+
+static int siu_pcm_trigger(struct snd_soc_component *component,
+			   struct snd_pcm_substream *ss, int cmd)
+{
+	struct siu_info *info = siu_i2s_data;
+	struct device *dev = ss->pcm->card->dev;
+	struct siu_port *port_info = siu_port_info(ss);
+	int ret;
+
+	dev_dbg(dev, "%s: port=%d@%p, cmd=%d\n", __func__,
+		info->port_id, port_info, cmd);
+
+	switch (cmd) {
+	case SNDRV_PCM_TRIGGER_START:
+		if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
+			ret = siu_pcm_stmwrite_start(port_info);
+		else
+			ret = siu_pcm_stmread_start(port_info);
+
+		if (ret < 0)
+			dev_warn(dev, "%s: start failed on port=%d\n",
+				 __func__, info->port_id);
+
+		break;
+	case SNDRV_PCM_TRIGGER_STOP:
+		if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
+			siu_pcm_stmwrite_stop(port_info);
+		else
+			siu_pcm_stmread_stop(port_info);
+		ret = 0;
+
+		break;
+	default:
+		dev_err(dev, "%s() unsupported cmd=%d\n", __func__, cmd);
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+/*
+ * So far only resolution of one period is supported, subject to extending the
+ * dmangine API
+ */
+static snd_pcm_uframes_t
+siu_pcm_pointer_dma(struct snd_soc_component *component,
+		    struct snd_pcm_substream *ss)
+{
+	struct device *dev = ss->pcm->card->dev;
+	struct siu_info *info = siu_i2s_data;
+	u32 __iomem *base = info->reg;
+	struct siu_port *port_info = siu_port_info(ss);
+	struct snd_pcm_runtime *rt = ss->runtime;
+	size_t ptr;
+	struct siu_stream *siu_stream;
+
+	if (ss->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		siu_stream = &port_info->playback;
+	else
+		siu_stream = &port_info->capture;
+
+	/*
+	 * ptr is the offset into the buffer where the dma is currently at. We
+	 * check if the dma buffer has just wrapped.
+	 */
+	ptr = PERIOD_OFFSET(rt->dma_addr,
+			    siu_stream->cur_period,
+			    siu_stream->period_bytes) - rt->dma_addr;
+
+	dev_dbg(dev,
+		"%s: port=%d, events %x, FSTS %x, xferred %u/%u, cookie %d\n",
+		__func__, info->port_id, siu_read32(base + SIU_EVNTC),
+		siu_read32(base + SIU_SBFSTS), ptr, siu_stream->buf_bytes,
+		siu_stream->cookie);
+
+	if (ptr >= siu_stream->buf_bytes)
+		ptr = 0;
+
+	return bytes_to_frames(ss->runtime, ptr);
+}
+
+static int siu_pcm_new(struct snd_soc_component *component,
+		       struct snd_soc_pcm_runtime *rtd)
+{
+	/* card->dev == socdev->dev, see snd_soc_new_pcms() */
+	struct snd_card *card = rtd->card->snd_card;
+	struct snd_pcm *pcm = rtd->pcm;
+	struct siu_info *info = siu_i2s_data;
+	struct platform_device *pdev = to_platform_device(card->dev);
+	int ret;
+	int i;
+
+	/* pdev->id selects between SIUA and SIUB */
+	if (pdev->id < 0 || pdev->id >= SIU_PORT_NUM)
+		return -EINVAL;
+
+	info->port_id = pdev->id;
+
+	/*
+	 * While the siu has 2 ports, only one port can be on at a time (only 1
+	 * SPB). So far all the boards using the siu had only one of the ports
+	 * wired to a codec. To simplify things, we only register one port with
+	 * alsa. In case both ports are needed, it should be changed here
+	 */
+	for (i = pdev->id; i < pdev->id + 1; i++) {
+		struct siu_port **port_info = &siu_ports[i];
+
+		ret = siu_init_port(i, port_info, card);
+		if (ret < 0)
+			return ret;
+
+		snd_pcm_set_managed_buffer_all(pcm,
+				SNDRV_DMA_TYPE_DEV, card->dev,
+				SIU_BUFFER_BYTES_MAX, SIU_BUFFER_BYTES_MAX);
+
+		(*port_info)->pcm = pcm;
+
+		/* IO works */
+		INIT_WORK(&(*port_info)->playback.work, siu_io_work);
+		INIT_WORK(&(*port_info)->capture.work, siu_io_work);
+	}
+
+	dev_info(card->dev, "SuperH SIU driver initialized.\n");
+	return 0;
+}
+
+static void siu_pcm_free(struct snd_soc_component *component,
+			 struct snd_pcm *pcm)
+{
+	struct platform_device *pdev = to_platform_device(pcm->card->dev);
+	struct siu_port *port_info = siu_ports[pdev->id];
+
+	cancel_work_sync(&port_info->capture.work);
+	cancel_work_sync(&port_info->playback.work);
+
+	siu_free_port(port_info);
+
+	dev_dbg(pcm->card->dev, "%s\n", __func__);
+}
+
+const struct snd_soc_component_driver siu_component = {
+	.name			= DRV_NAME,
+	.open			= siu_pcm_open,
+	.close			= siu_pcm_close,
+	.prepare		= siu_pcm_prepare,
+	.trigger		= siu_pcm_trigger,
+	.pointer		= siu_pcm_pointer_dma,
+	.pcm_construct		= siu_pcm_new,
+	.pcm_destruct		= siu_pcm_free,
+	.legacy_dai_naming	= 1,
+};
+EXPORT_SYMBOL_GPL(siu_component);