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, 481 insertions, 0 deletions

diff --git a/drivers/mmc/host/renesas_sdhi_sys_dmac.c b/drivers/mmc/host/renesas_sdhi_sys_dmac.c
new file mode 100644
index 000000000..b559ad38b
--- /dev/null
+++ b/drivers/mmc/host/renesas_sdhi_sys_dmac.c
@@ -0,0 +1,481 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * DMA support use of SYS DMAC with SDHI SD/SDIO controller
+ *
+ * Copyright (C) 2016-19 Renesas Electronics Corporation
+ * Copyright (C) 2016-19 Sang Engineering, Wolfram Sang
+ * Copyright (C) 2017 Horms Solutions, Simon Horman
+ * Copyright (C) 2010-2011 Guennadi Liakhovetski
+ */
+
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/dmaengine.h>
+#include <linux/mfd/tmio.h>
+#include <linux/mmc/host.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/pagemap.h>
+#include <linux/scatterlist.h>
+#include <linux/sys_soc.h>
+
+#include "renesas_sdhi.h"
+#include "tmio_mmc.h"
+
+#define TMIO_MMC_MIN_DMA_LEN 8
+
+static const struct renesas_sdhi_of_data of_default_cfg = {
+	.tmio_flags = TMIO_MMC_HAS_IDLE_WAIT,
+};
+
+static const struct renesas_sdhi_of_data of_rz_compatible = {
+	.tmio_flags	= TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_32BIT_DATA_PORT |
+			  TMIO_MMC_HAVE_CBSY,
+	.tmio_ocr_mask	= MMC_VDD_32_33,
+	.capabilities	= MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ |
+			  MMC_CAP_WAIT_WHILE_BUSY,
+};
+
+static const struct renesas_sdhi_of_data of_rcar_gen1_compatible = {
+	.tmio_flags	= TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_CLK_ACTUAL,
+	.capabilities	= MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ |
+			  MMC_CAP_WAIT_WHILE_BUSY,
+	.capabilities2	= MMC_CAP2_NO_WRITE_PROTECT,
+};
+
+/* Definitions for sampling clocks */
+static struct renesas_sdhi_scc rcar_gen2_scc_taps[] = {
+	{
+		.clk_rate = 156000000,
+		.tap = 0x00000703,
+	},
+	{
+		.clk_rate = 0,
+		.tap = 0x00000300,
+	},
+};
+
+static const struct renesas_sdhi_of_data of_rcar_gen2_compatible = {
+	.tmio_flags	= TMIO_MMC_HAS_IDLE_WAIT | TMIO_MMC_CLK_ACTUAL |
+			  TMIO_MMC_HAVE_CBSY | TMIO_MMC_MIN_RCAR2,
+	.capabilities	= MMC_CAP_SD_HIGHSPEED | MMC_CAP_SDIO_IRQ |
+			  MMC_CAP_CMD23 | MMC_CAP_WAIT_WHILE_BUSY,
+	.capabilities2	= MMC_CAP2_NO_WRITE_PROTECT,
+	.dma_buswidth	= DMA_SLAVE_BUSWIDTH_4_BYTES,
+	.dma_rx_offset	= 0x2000,
+	.scc_offset	= 0x0300,
+	.taps		= rcar_gen2_scc_taps,
+	.taps_num	= ARRAY_SIZE(rcar_gen2_scc_taps),
+	.max_blk_count	= UINT_MAX / TMIO_MAX_BLK_SIZE,
+};
+
+static const struct of_device_id renesas_sdhi_sys_dmac_of_match[] = {
+	{ .compatible = "renesas,sdhi-sh73a0", .data = &of_default_cfg, },
+	{ .compatible = "renesas,sdhi-r8a73a4", .data = &of_default_cfg, },
+	{ .compatible = "renesas,sdhi-r8a7740", .data = &of_default_cfg, },
+	{ .compatible = "renesas,sdhi-r7s72100", .data = &of_rz_compatible, },
+	{ .compatible = "renesas,sdhi-r8a7778", .data = &of_rcar_gen1_compatible, },
+	{ .compatible = "renesas,sdhi-r8a7779", .data = &of_rcar_gen1_compatible, },
+	{ .compatible = "renesas,sdhi-r8a7743", .data = &of_rcar_gen2_compatible, },
+	{ .compatible = "renesas,sdhi-r8a7745", .data = &of_rcar_gen2_compatible, },
+	{ .compatible = "renesas,sdhi-r8a7790", .data = &of_rcar_gen2_compatible, },
+	{ .compatible = "renesas,sdhi-r8a7791", .data = &of_rcar_gen2_compatible, },
+	{ .compatible = "renesas,sdhi-r8a7792", .data = &of_rcar_gen2_compatible, },
+	{ .compatible = "renesas,sdhi-r8a7793", .data = &of_rcar_gen2_compatible, },
+	{ .compatible = "renesas,sdhi-r8a7794", .data = &of_rcar_gen2_compatible, },
+	{ .compatible = "renesas,rcar-gen1-sdhi", .data = &of_rcar_gen1_compatible, },
+	{ .compatible = "renesas,rcar-gen2-sdhi", .data = &of_rcar_gen2_compatible, },
+	{ .compatible = "renesas,sdhi-shmobile" },
+	{},
+};
+MODULE_DEVICE_TABLE(of, renesas_sdhi_sys_dmac_of_match);
+
+static void renesas_sdhi_sys_dmac_enable_dma(struct tmio_mmc_host *host,
+					     bool enable)
+{
+	struct renesas_sdhi *priv = host_to_priv(host);
+
+	if (!host->chan_tx || !host->chan_rx)
+		return;
+
+	if (priv->dma_priv.enable)
+		priv->dma_priv.enable(host, enable);
+}
+
+static void renesas_sdhi_sys_dmac_abort_dma(struct tmio_mmc_host *host)
+{
+	renesas_sdhi_sys_dmac_enable_dma(host, false);
+
+	if (host->chan_rx)
+		dmaengine_terminate_sync(host->chan_rx);
+	if (host->chan_tx)
+		dmaengine_terminate_sync(host->chan_tx);
+
+	renesas_sdhi_sys_dmac_enable_dma(host, true);
+}
+
+static void renesas_sdhi_sys_dmac_dataend_dma(struct tmio_mmc_host *host)
+{
+	struct renesas_sdhi *priv = host_to_priv(host);
+
+	complete(&priv->dma_priv.dma_dataend);
+}
+
+static void renesas_sdhi_sys_dmac_dma_callback(void *arg)
+{
+	struct tmio_mmc_host *host = arg;
+	struct renesas_sdhi *priv = host_to_priv(host);
+
+	spin_lock_irq(&host->lock);
+
+	if (!host->data)
+		goto out;
+
+	if (host->data->flags & MMC_DATA_READ)
+		dma_unmap_sg(host->chan_rx->device->dev,
+			     host->sg_ptr, host->sg_len,
+			     DMA_FROM_DEVICE);
+	else
+		dma_unmap_sg(host->chan_tx->device->dev,
+			     host->sg_ptr, host->sg_len,
+			     DMA_TO_DEVICE);
+
+	spin_unlock_irq(&host->lock);
+
+	wait_for_completion(&priv->dma_priv.dma_dataend);
+
+	spin_lock_irq(&host->lock);
+	tmio_mmc_do_data_irq(host);
+out:
+	spin_unlock_irq(&host->lock);
+}
+
+static void renesas_sdhi_sys_dmac_start_dma_rx(struct tmio_mmc_host *host)
+{
+	struct renesas_sdhi *priv = host_to_priv(host);
+	struct scatterlist *sg = host->sg_ptr, *sg_tmp;
+	struct dma_async_tx_descriptor *desc = NULL;
+	struct dma_chan *chan = host->chan_rx;
+	dma_cookie_t cookie;
+	int ret, i;
+	bool aligned = true, multiple = true;
+	unsigned int align = 1;	/* 2-byte alignment */
+
+	for_each_sg(sg, sg_tmp, host->sg_len, i) {
+		if (sg_tmp->offset & align)
+			aligned = false;
+		if (sg_tmp->length & align) {
+			multiple = false;
+			break;
+		}
+	}
+
+	if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_SIZE ||
+			  (align & PAGE_MASK))) || !multiple) {
+		ret = -EINVAL;
+		goto pio;
+	}
+
+	if (sg->length < TMIO_MMC_MIN_DMA_LEN)
+		return;
+
+	/* The only sg element can be unaligned, use our bounce buffer then */
+	if (!aligned) {
+		sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length);
+		host->sg_ptr = &host->bounce_sg;
+		sg = host->sg_ptr;
+	}
+
+	ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_FROM_DEVICE);
+	if (ret > 0)
+		desc = dmaengine_prep_slave_sg(chan, sg, ret, DMA_DEV_TO_MEM,
+					       DMA_CTRL_ACK);
+
+	if (desc) {
+		reinit_completion(&priv->dma_priv.dma_dataend);
+		desc->callback = renesas_sdhi_sys_dmac_dma_callback;
+		desc->callback_param = host;
+
+		cookie = dmaengine_submit(desc);
+		if (cookie < 0) {
+			desc = NULL;
+			ret = cookie;
+		}
+		host->dma_on = true;
+	}
+pio:
+	if (!desc) {
+		/* DMA failed, fall back to PIO */
+		renesas_sdhi_sys_dmac_enable_dma(host, false);
+		if (ret >= 0)
+			ret = -EIO;
+		host->chan_rx = NULL;
+		dma_release_channel(chan);
+		/* Free the Tx channel too */
+		chan = host->chan_tx;
+		if (chan) {
+			host->chan_tx = NULL;
+			dma_release_channel(chan);
+		}
+		dev_warn(&host->pdev->dev,
+			 "DMA failed: %d, falling back to PIO\n", ret);
+	}
+}
+
+static void renesas_sdhi_sys_dmac_start_dma_tx(struct tmio_mmc_host *host)
+{
+	struct renesas_sdhi *priv = host_to_priv(host);
+	struct scatterlist *sg = host->sg_ptr, *sg_tmp;
+	struct dma_async_tx_descriptor *desc = NULL;
+	struct dma_chan *chan = host->chan_tx;
+	dma_cookie_t cookie;
+	int ret, i;
+	bool aligned = true, multiple = true;
+	unsigned int align = 1;	/* 2-byte alignment */
+
+	for_each_sg(sg, sg_tmp, host->sg_len, i) {
+		if (sg_tmp->offset & align)
+			aligned = false;
+		if (sg_tmp->length & align) {
+			multiple = false;
+			break;
+		}
+	}
+
+	if ((!aligned && (host->sg_len > 1 || sg->length > PAGE_SIZE ||
+			  (align & PAGE_MASK))) || !multiple) {
+		ret = -EINVAL;
+		goto pio;
+	}
+
+	if (sg->length < TMIO_MMC_MIN_DMA_LEN)
+		return;
+
+	/* The only sg element can be unaligned, use our bounce buffer then */
+	if (!aligned) {
+		void *sg_vaddr = kmap_local_page(sg_page(sg));
+
+		sg_init_one(&host->bounce_sg, host->bounce_buf, sg->length);
+		memcpy(host->bounce_buf, sg_vaddr + sg->offset, host->bounce_sg.length);
+		kunmap_local(sg_vaddr);
+		host->sg_ptr = &host->bounce_sg;
+		sg = host->sg_ptr;
+	}
+
+	ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_TO_DEVICE);
+	if (ret > 0)
+		desc = dmaengine_prep_slave_sg(chan, sg, ret, DMA_MEM_TO_DEV,
+					       DMA_CTRL_ACK);
+
+	if (desc) {
+		reinit_completion(&priv->dma_priv.dma_dataend);
+		desc->callback = renesas_sdhi_sys_dmac_dma_callback;
+		desc->callback_param = host;
+
+		cookie = dmaengine_submit(desc);
+		if (cookie < 0) {
+			desc = NULL;
+			ret = cookie;
+		}
+		host->dma_on = true;
+	}
+pio:
+	if (!desc) {
+		/* DMA failed, fall back to PIO */
+		renesas_sdhi_sys_dmac_enable_dma(host, false);
+		if (ret >= 0)
+			ret = -EIO;
+		host->chan_tx = NULL;
+		dma_release_channel(chan);
+		/* Free the Rx channel too */
+		chan = host->chan_rx;
+		if (chan) {
+			host->chan_rx = NULL;
+			dma_release_channel(chan);
+		}
+		dev_warn(&host->pdev->dev,
+			 "DMA failed: %d, falling back to PIO\n", ret);
+	}
+}
+
+static void renesas_sdhi_sys_dmac_start_dma(struct tmio_mmc_host *host,
+					    struct mmc_data *data)
+{
+	if (data->flags & MMC_DATA_READ) {
+		if (host->chan_rx)
+			renesas_sdhi_sys_dmac_start_dma_rx(host);
+	} else {
+		if (host->chan_tx)
+			renesas_sdhi_sys_dmac_start_dma_tx(host);
+	}
+}
+
+static void renesas_sdhi_sys_dmac_issue_tasklet_fn(unsigned long priv)
+{
+	struct tmio_mmc_host *host = (struct tmio_mmc_host *)priv;
+	struct dma_chan *chan = NULL;
+
+	spin_lock_irq(&host->lock);
+
+	if (host->data) {
+		if (host->data->flags & MMC_DATA_READ)
+			chan = host->chan_rx;
+		else
+			chan = host->chan_tx;
+	}
+
+	spin_unlock_irq(&host->lock);
+
+	tmio_mmc_enable_mmc_irqs(host, TMIO_STAT_DATAEND);
+
+	if (chan)
+		dma_async_issue_pending(chan);
+}
+
+static void renesas_sdhi_sys_dmac_request_dma(struct tmio_mmc_host *host,
+					      struct tmio_mmc_data *pdata)
+{
+	struct renesas_sdhi *priv = host_to_priv(host);
+
+	/* We can only either use DMA for both Tx and Rx or not use it at all */
+	if (!host->pdev->dev.of_node &&
+	    (!pdata->chan_priv_tx || !pdata->chan_priv_rx))
+		return;
+
+	if (!host->chan_tx && !host->chan_rx) {
+		struct resource *res = platform_get_resource(host->pdev,
+							     IORESOURCE_MEM, 0);
+		struct dma_slave_config cfg = {};
+		dma_cap_mask_t mask;
+		int ret;
+
+		if (!res)
+			return;
+
+		dma_cap_zero(mask);
+		dma_cap_set(DMA_SLAVE, mask);
+
+		host->chan_tx = dma_request_slave_channel_compat(mask,
+					priv->dma_priv.filter, pdata->chan_priv_tx,
+					&host->pdev->dev, "tx");
+		dev_dbg(&host->pdev->dev, "%s: TX: got channel %p\n", __func__,
+			host->chan_tx);
+
+		if (!host->chan_tx)
+			return;
+
+		cfg.direction = DMA_MEM_TO_DEV;
+		cfg.dst_addr = res->start +
+			(CTL_SD_DATA_PORT << host->bus_shift);
+		cfg.dst_addr_width = priv->dma_priv.dma_buswidth;
+		if (!cfg.dst_addr_width)
+			cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+		cfg.src_addr = 0;
+		ret = dmaengine_slave_config(host->chan_tx, &cfg);
+		if (ret < 0)
+			goto ecfgtx;
+
+		host->chan_rx = dma_request_slave_channel_compat(mask,
+					priv->dma_priv.filter, pdata->chan_priv_rx,
+					&host->pdev->dev, "rx");
+		dev_dbg(&host->pdev->dev, "%s: RX: got channel %p\n", __func__,
+			host->chan_rx);
+
+		if (!host->chan_rx)
+			goto ereqrx;
+
+		cfg.direction = DMA_DEV_TO_MEM;
+		cfg.src_addr = cfg.dst_addr + host->pdata->dma_rx_offset;
+		cfg.src_addr_width = priv->dma_priv.dma_buswidth;
+		if (!cfg.src_addr_width)
+			cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_2_BYTES;
+		cfg.dst_addr = 0;
+		ret = dmaengine_slave_config(host->chan_rx, &cfg);
+		if (ret < 0)
+			goto ecfgrx;
+
+		host->bounce_buf = (u8 *)__get_free_page(GFP_KERNEL | GFP_DMA);
+		if (!host->bounce_buf)
+			goto ebouncebuf;
+
+		init_completion(&priv->dma_priv.dma_dataend);
+		tasklet_init(&host->dma_issue,
+			     renesas_sdhi_sys_dmac_issue_tasklet_fn,
+			     (unsigned long)host);
+	}
+
+	renesas_sdhi_sys_dmac_enable_dma(host, true);
+
+	return;
+
+ebouncebuf:
+ecfgrx:
+	dma_release_channel(host->chan_rx);
+	host->chan_rx = NULL;
+ereqrx:
+ecfgtx:
+	dma_release_channel(host->chan_tx);
+	host->chan_tx = NULL;
+}
+
+static void renesas_sdhi_sys_dmac_release_dma(struct tmio_mmc_host *host)
+{
+	if (host->chan_tx) {
+		struct dma_chan *chan = host->chan_tx;
+
+		host->chan_tx = NULL;
+		dma_release_channel(chan);
+	}
+	if (host->chan_rx) {
+		struct dma_chan *chan = host->chan_rx;
+
+		host->chan_rx = NULL;
+		dma_release_channel(chan);
+	}
+	if (host->bounce_buf) {
+		free_pages((unsigned long)host->bounce_buf, 0);
+		host->bounce_buf = NULL;
+	}
+}
+
+static const struct tmio_mmc_dma_ops renesas_sdhi_sys_dmac_dma_ops = {
+	.start = renesas_sdhi_sys_dmac_start_dma,
+	.enable = renesas_sdhi_sys_dmac_enable_dma,
+	.request = renesas_sdhi_sys_dmac_request_dma,
+	.release = renesas_sdhi_sys_dmac_release_dma,
+	.abort = renesas_sdhi_sys_dmac_abort_dma,
+	.dataend = renesas_sdhi_sys_dmac_dataend_dma,
+};
+
+static int renesas_sdhi_sys_dmac_probe(struct platform_device *pdev)
+{
+	return renesas_sdhi_probe(pdev, &renesas_sdhi_sys_dmac_dma_ops,
+				  of_device_get_match_data(&pdev->dev), NULL);
+}
+
+static const struct dev_pm_ops renesas_sdhi_sys_dmac_dev_pm_ops = {
+	SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+				pm_runtime_force_resume)
+	SET_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
+			   tmio_mmc_host_runtime_resume,
+			   NULL)
+};
+
+static struct platform_driver renesas_sys_dmac_sdhi_driver = {
+	.driver		= {
+		.name	= "sh_mobile_sdhi",
+		.probe_type = PROBE_PREFER_ASYNCHRONOUS,
+		.pm	= &renesas_sdhi_sys_dmac_dev_pm_ops,
+		.of_match_table = renesas_sdhi_sys_dmac_of_match,
+	},
+	.probe		= renesas_sdhi_sys_dmac_probe,
+	.remove		= renesas_sdhi_remove,
+};
+
+module_platform_driver(renesas_sys_dmac_sdhi_driver);
+
+MODULE_DESCRIPTION("Renesas SDHI driver");
+MODULE_AUTHOR("Magnus Damm");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:sh_mobile_sdhi");