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, 1434 insertions, 0 deletions

diff --git a/drivers/dma/ep93xx_dma.c b/drivers/dma/ep93xx_dma.c
new file mode 100644
index 000000000..d19ea885c
--- /dev/null
+++ b/drivers/dma/ep93xx_dma.c
@@ -0,0 +1,1434 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for the Cirrus Logic EP93xx DMA Controller
+ *
+ * Copyright (C) 2011 Mika Westerberg
+ *
+ * DMA M2P implementation is based on the original
+ * arch/arm/mach-ep93xx/dma-m2p.c which has following copyrights:
+ *
+ *   Copyright (C) 2006 Lennert Buytenhek <buytenh@wantstofly.org>
+ *   Copyright (C) 2006 Applied Data Systems
+ *   Copyright (C) 2009 Ryan Mallon <rmallon@gmail.com>
+ *
+ * This driver is based on dw_dmac and amba-pl08x drivers.
+ */
+
+#include <linux/clk.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/dmaengine.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+#include <linux/platform_data/dma-ep93xx.h>
+
+#include "dmaengine.h"
+
+/* M2P registers */
+#define M2P_CONTROL			0x0000
+#define M2P_CONTROL_STALLINT		BIT(0)
+#define M2P_CONTROL_NFBINT		BIT(1)
+#define M2P_CONTROL_CH_ERROR_INT	BIT(3)
+#define M2P_CONTROL_ENABLE		BIT(4)
+#define M2P_CONTROL_ICE			BIT(6)
+
+#define M2P_INTERRUPT			0x0004
+#define M2P_INTERRUPT_STALL		BIT(0)
+#define M2P_INTERRUPT_NFB		BIT(1)
+#define M2P_INTERRUPT_ERROR		BIT(3)
+
+#define M2P_PPALLOC			0x0008
+#define M2P_STATUS			0x000c
+
+#define M2P_MAXCNT0			0x0020
+#define M2P_BASE0			0x0024
+#define M2P_MAXCNT1			0x0030
+#define M2P_BASE1			0x0034
+
+#define M2P_STATE_IDLE			0
+#define M2P_STATE_STALL			1
+#define M2P_STATE_ON			2
+#define M2P_STATE_NEXT			3
+
+/* M2M registers */
+#define M2M_CONTROL			0x0000
+#define M2M_CONTROL_DONEINT		BIT(2)
+#define M2M_CONTROL_ENABLE		BIT(3)
+#define M2M_CONTROL_START		BIT(4)
+#define M2M_CONTROL_DAH			BIT(11)
+#define M2M_CONTROL_SAH			BIT(12)
+#define M2M_CONTROL_PW_SHIFT		9
+#define M2M_CONTROL_PW_8		(0 << M2M_CONTROL_PW_SHIFT)
+#define M2M_CONTROL_PW_16		(1 << M2M_CONTROL_PW_SHIFT)
+#define M2M_CONTROL_PW_32		(2 << M2M_CONTROL_PW_SHIFT)
+#define M2M_CONTROL_PW_MASK		(3 << M2M_CONTROL_PW_SHIFT)
+#define M2M_CONTROL_TM_SHIFT		13
+#define M2M_CONTROL_TM_TX		(1 << M2M_CONTROL_TM_SHIFT)
+#define M2M_CONTROL_TM_RX		(2 << M2M_CONTROL_TM_SHIFT)
+#define M2M_CONTROL_NFBINT		BIT(21)
+#define M2M_CONTROL_RSS_SHIFT		22
+#define M2M_CONTROL_RSS_SSPRX		(1 << M2M_CONTROL_RSS_SHIFT)
+#define M2M_CONTROL_RSS_SSPTX		(2 << M2M_CONTROL_RSS_SHIFT)
+#define M2M_CONTROL_RSS_IDE		(3 << M2M_CONTROL_RSS_SHIFT)
+#define M2M_CONTROL_NO_HDSK		BIT(24)
+#define M2M_CONTROL_PWSC_SHIFT		25
+
+#define M2M_INTERRUPT			0x0004
+#define M2M_INTERRUPT_MASK		6
+
+#define M2M_STATUS			0x000c
+#define M2M_STATUS_CTL_SHIFT		1
+#define M2M_STATUS_CTL_IDLE		(0 << M2M_STATUS_CTL_SHIFT)
+#define M2M_STATUS_CTL_STALL		(1 << M2M_STATUS_CTL_SHIFT)
+#define M2M_STATUS_CTL_MEMRD		(2 << M2M_STATUS_CTL_SHIFT)
+#define M2M_STATUS_CTL_MEMWR		(3 << M2M_STATUS_CTL_SHIFT)
+#define M2M_STATUS_CTL_BWCWAIT		(4 << M2M_STATUS_CTL_SHIFT)
+#define M2M_STATUS_CTL_MASK		(7 << M2M_STATUS_CTL_SHIFT)
+#define M2M_STATUS_BUF_SHIFT		4
+#define M2M_STATUS_BUF_NO		(0 << M2M_STATUS_BUF_SHIFT)
+#define M2M_STATUS_BUF_ON		(1 << M2M_STATUS_BUF_SHIFT)
+#define M2M_STATUS_BUF_NEXT		(2 << M2M_STATUS_BUF_SHIFT)
+#define M2M_STATUS_BUF_MASK		(3 << M2M_STATUS_BUF_SHIFT)
+#define M2M_STATUS_DONE			BIT(6)
+
+#define M2M_BCR0			0x0010
+#define M2M_BCR1			0x0014
+#define M2M_SAR_BASE0			0x0018
+#define M2M_SAR_BASE1			0x001c
+#define M2M_DAR_BASE0			0x002c
+#define M2M_DAR_BASE1			0x0030
+
+#define DMA_MAX_CHAN_BYTES		0xffff
+#define DMA_MAX_CHAN_DESCRIPTORS	32
+
+struct ep93xx_dma_engine;
+static int ep93xx_dma_slave_config_write(struct dma_chan *chan,
+					 enum dma_transfer_direction dir,
+					 struct dma_slave_config *config);
+
+/**
+ * struct ep93xx_dma_desc - EP93xx specific transaction descriptor
+ * @src_addr: source address of the transaction
+ * @dst_addr: destination address of the transaction
+ * @size: size of the transaction (in bytes)
+ * @complete: this descriptor is completed
+ * @txd: dmaengine API descriptor
+ * @tx_list: list of linked descriptors
+ * @node: link used for putting this into a channel queue
+ */
+struct ep93xx_dma_desc {
+	u32				src_addr;
+	u32				dst_addr;
+	size_t				size;
+	bool				complete;
+	struct dma_async_tx_descriptor	txd;
+	struct list_head		tx_list;
+	struct list_head		node;
+};
+
+/**
+ * struct ep93xx_dma_chan - an EP93xx DMA M2P/M2M channel
+ * @chan: dmaengine API channel
+ * @edma: pointer to the engine device
+ * @regs: memory mapped registers
+ * @irq: interrupt number of the channel
+ * @clk: clock used by this channel
+ * @tasklet: channel specific tasklet used for callbacks
+ * @lock: lock protecting the fields following
+ * @flags: flags for the channel
+ * @buffer: which buffer to use next (0/1)
+ * @active: flattened chain of descriptors currently being processed
+ * @queue: pending descriptors which are handled next
+ * @free_list: list of free descriptors which can be used
+ * @runtime_addr: physical address currently used as dest/src (M2M only). This
+ *                is set via .device_config before slave operation is
+ *                prepared
+ * @runtime_ctrl: M2M runtime values for the control register.
+ * @slave_config: slave configuration
+ *
+ * As EP93xx DMA controller doesn't support real chained DMA descriptors we
+ * will have slightly different scheme here: @active points to a head of
+ * flattened DMA descriptor chain.
+ *
+ * @queue holds pending transactions. These are linked through the first
+ * descriptor in the chain. When a descriptor is moved to the @active queue,
+ * the first and chained descriptors are flattened into a single list.
+ *
+ * @chan.private holds pointer to &struct ep93xx_dma_data which contains
+ * necessary channel configuration information. For memcpy channels this must
+ * be %NULL.
+ */
+struct ep93xx_dma_chan {
+	struct dma_chan			chan;
+	const struct ep93xx_dma_engine	*edma;
+	void __iomem			*regs;
+	int				irq;
+	struct clk			*clk;
+	struct tasklet_struct		tasklet;
+	/* protects the fields following */
+	spinlock_t			lock;
+	unsigned long			flags;
+/* Channel is configured for cyclic transfers */
+#define EP93XX_DMA_IS_CYCLIC		0
+
+	int				buffer;
+	struct list_head		active;
+	struct list_head		queue;
+	struct list_head		free_list;
+	u32				runtime_addr;
+	u32				runtime_ctrl;
+	struct dma_slave_config		slave_config;
+};
+
+/**
+ * struct ep93xx_dma_engine - the EP93xx DMA engine instance
+ * @dma_dev: holds the dmaengine device
+ * @m2m: is this an M2M or M2P device
+ * @hw_setup: method which sets the channel up for operation
+ * @hw_synchronize: synchronizes DMA channel termination to current context
+ * @hw_shutdown: shuts the channel down and flushes whatever is left
+ * @hw_submit: pushes active descriptor(s) to the hardware
+ * @hw_interrupt: handle the interrupt
+ * @num_channels: number of channels for this instance
+ * @channels: array of channels
+ *
+ * There is one instance of this struct for the M2P channels and one for the
+ * M2M channels. hw_xxx() methods are used to perform operations which are
+ * different on M2M and M2P channels. These methods are called with channel
+ * lock held and interrupts disabled so they cannot sleep.
+ */
+struct ep93xx_dma_engine {
+	struct dma_device	dma_dev;
+	bool			m2m;
+	int			(*hw_setup)(struct ep93xx_dma_chan *);
+	void			(*hw_synchronize)(struct ep93xx_dma_chan *);
+	void			(*hw_shutdown)(struct ep93xx_dma_chan *);
+	void			(*hw_submit)(struct ep93xx_dma_chan *);
+	int			(*hw_interrupt)(struct ep93xx_dma_chan *);
+#define INTERRUPT_UNKNOWN	0
+#define INTERRUPT_DONE		1
+#define INTERRUPT_NEXT_BUFFER	2
+
+	size_t			num_channels;
+	struct ep93xx_dma_chan	channels[];
+};
+
+static inline struct device *chan2dev(struct ep93xx_dma_chan *edmac)
+{
+	return &edmac->chan.dev->device;
+}
+
+static struct ep93xx_dma_chan *to_ep93xx_dma_chan(struct dma_chan *chan)
+{
+	return container_of(chan, struct ep93xx_dma_chan, chan);
+}
+
+/**
+ * ep93xx_dma_set_active - set new active descriptor chain
+ * @edmac: channel
+ * @desc: head of the new active descriptor chain
+ *
+ * Sets @desc to be the head of the new active descriptor chain. This is the
+ * chain which is processed next. The active list must be empty before calling
+ * this function.
+ *
+ * Called with @edmac->lock held and interrupts disabled.
+ */
+static void ep93xx_dma_set_active(struct ep93xx_dma_chan *edmac,
+				  struct ep93xx_dma_desc *desc)
+{
+	BUG_ON(!list_empty(&edmac->active));
+
+	list_add_tail(&desc->node, &edmac->active);
+
+	/* Flatten the @desc->tx_list chain into @edmac->active list */
+	while (!list_empty(&desc->tx_list)) {
+		struct ep93xx_dma_desc *d = list_first_entry(&desc->tx_list,
+			struct ep93xx_dma_desc, node);
+
+		/*
+		 * We copy the callback parameters from the first descriptor
+		 * to all the chained descriptors. This way we can call the
+		 * callback without having to find out the first descriptor in
+		 * the chain. Useful for cyclic transfers.
+		 */
+		d->txd.callback = desc->txd.callback;
+		d->txd.callback_param = desc->txd.callback_param;
+
+		list_move_tail(&d->node, &edmac->active);
+	}
+}
+
+/* Called with @edmac->lock held and interrupts disabled */
+static struct ep93xx_dma_desc *
+ep93xx_dma_get_active(struct ep93xx_dma_chan *edmac)
+{
+	return list_first_entry_or_null(&edmac->active,
+					struct ep93xx_dma_desc, node);
+}
+
+/**
+ * ep93xx_dma_advance_active - advances to the next active descriptor
+ * @edmac: channel
+ *
+ * Function advances active descriptor to the next in the @edmac->active and
+ * returns %true if we still have descriptors in the chain to process.
+ * Otherwise returns %false.
+ *
+ * When the channel is in cyclic mode always returns %true.
+ *
+ * Called with @edmac->lock held and interrupts disabled.
+ */
+static bool ep93xx_dma_advance_active(struct ep93xx_dma_chan *edmac)
+{
+	struct ep93xx_dma_desc *desc;
+
+	list_rotate_left(&edmac->active);
+
+	if (test_bit(EP93XX_DMA_IS_CYCLIC, &edmac->flags))
+		return true;
+
+	desc = ep93xx_dma_get_active(edmac);
+	if (!desc)
+		return false;
+
+	/*
+	 * If txd.cookie is set it means that we are back in the first
+	 * descriptor in the chain and hence done with it.
+	 */
+	return !desc->txd.cookie;
+}
+
+/*
+ * M2P DMA implementation
+ */
+
+static void m2p_set_control(struct ep93xx_dma_chan *edmac, u32 control)
+{
+	writel(control, edmac->regs + M2P_CONTROL);
+	/*
+	 * EP93xx User's Guide states that we must perform a dummy read after
+	 * write to the control register.
+	 */
+	readl(edmac->regs + M2P_CONTROL);
+}
+
+static int m2p_hw_setup(struct ep93xx_dma_chan *edmac)
+{
+	struct ep93xx_dma_data *data = edmac->chan.private;
+	u32 control;
+
+	writel(data->port & 0xf, edmac->regs + M2P_PPALLOC);
+
+	control = M2P_CONTROL_CH_ERROR_INT | M2P_CONTROL_ICE
+		| M2P_CONTROL_ENABLE;
+	m2p_set_control(edmac, control);
+
+	edmac->buffer = 0;
+
+	return 0;
+}
+
+static inline u32 m2p_channel_state(struct ep93xx_dma_chan *edmac)
+{
+	return (readl(edmac->regs + M2P_STATUS) >> 4) & 0x3;
+}
+
+static void m2p_hw_synchronize(struct ep93xx_dma_chan *edmac)
+{
+	unsigned long flags;
+	u32 control;
+
+	spin_lock_irqsave(&edmac->lock, flags);
+	control = readl(edmac->regs + M2P_CONTROL);
+	control &= ~(M2P_CONTROL_STALLINT | M2P_CONTROL_NFBINT);
+	m2p_set_control(edmac, control);
+	spin_unlock_irqrestore(&edmac->lock, flags);
+
+	while (m2p_channel_state(edmac) >= M2P_STATE_ON)
+		schedule();
+}
+
+static void m2p_hw_shutdown(struct ep93xx_dma_chan *edmac)
+{
+	m2p_set_control(edmac, 0);
+
+	while (m2p_channel_state(edmac) != M2P_STATE_IDLE)
+		dev_warn(chan2dev(edmac), "M2P: Not yet IDLE\n");
+}
+
+static void m2p_fill_desc(struct ep93xx_dma_chan *edmac)
+{
+	struct ep93xx_dma_desc *desc;
+	u32 bus_addr;
+
+	desc = ep93xx_dma_get_active(edmac);
+	if (!desc) {
+		dev_warn(chan2dev(edmac), "M2P: empty descriptor list\n");
+		return;
+	}
+
+	if (ep93xx_dma_chan_direction(&edmac->chan) == DMA_MEM_TO_DEV)
+		bus_addr = desc->src_addr;
+	else
+		bus_addr = desc->dst_addr;
+
+	if (edmac->buffer == 0) {
+		writel(desc->size, edmac->regs + M2P_MAXCNT0);
+		writel(bus_addr, edmac->regs + M2P_BASE0);
+	} else {
+		writel(desc->size, edmac->regs + M2P_MAXCNT1);
+		writel(bus_addr, edmac->regs + M2P_BASE1);
+	}
+
+	edmac->buffer ^= 1;
+}
+
+static void m2p_hw_submit(struct ep93xx_dma_chan *edmac)
+{
+	u32 control = readl(edmac->regs + M2P_CONTROL);
+
+	m2p_fill_desc(edmac);
+	control |= M2P_CONTROL_STALLINT;
+
+	if (ep93xx_dma_advance_active(edmac)) {
+		m2p_fill_desc(edmac);
+		control |= M2P_CONTROL_NFBINT;
+	}
+
+	m2p_set_control(edmac, control);
+}
+
+static int m2p_hw_interrupt(struct ep93xx_dma_chan *edmac)
+{
+	u32 irq_status = readl(edmac->regs + M2P_INTERRUPT);
+	u32 control;
+
+	if (irq_status & M2P_INTERRUPT_ERROR) {
+		struct ep93xx_dma_desc *desc = ep93xx_dma_get_active(edmac);
+
+		/* Clear the error interrupt */
+		writel(1, edmac->regs + M2P_INTERRUPT);
+
+		/*
+		 * It seems that there is no easy way of reporting errors back
+		 * to client so we just report the error here and continue as
+		 * usual.
+		 *
+		 * Revisit this when there is a mechanism to report back the
+		 * errors.
+		 */
+		dev_err(chan2dev(edmac),
+			"DMA transfer failed! Details:\n"
+			"\tcookie	: %d\n"
+			"\tsrc_addr	: 0x%08x\n"
+			"\tdst_addr	: 0x%08x\n"
+			"\tsize		: %zu\n",
+			desc->txd.cookie, desc->src_addr, desc->dst_addr,
+			desc->size);
+	}
+
+	/*
+	 * Even latest E2 silicon revision sometimes assert STALL interrupt
+	 * instead of NFB. Therefore we treat them equally, basing on the
+	 * amount of data we still have to transfer.
+	 */
+	if (!(irq_status & (M2P_INTERRUPT_STALL | M2P_INTERRUPT_NFB)))
+		return INTERRUPT_UNKNOWN;
+
+	if (ep93xx_dma_advance_active(edmac)) {
+		m2p_fill_desc(edmac);
+		return INTERRUPT_NEXT_BUFFER;
+	}
+
+	/* Disable interrupts */
+	control = readl(edmac->regs + M2P_CONTROL);
+	control &= ~(M2P_CONTROL_STALLINT | M2P_CONTROL_NFBINT);
+	m2p_set_control(edmac, control);
+
+	return INTERRUPT_DONE;
+}
+
+/*
+ * M2M DMA implementation
+ */
+
+static int m2m_hw_setup(struct ep93xx_dma_chan *edmac)
+{
+	const struct ep93xx_dma_data *data = edmac->chan.private;
+	u32 control = 0;
+
+	if (!data) {
+		/* This is memcpy channel, nothing to configure */
+		writel(control, edmac->regs + M2M_CONTROL);
+		return 0;
+	}
+
+	switch (data->port) {
+	case EP93XX_DMA_SSP:
+		/*
+		 * This was found via experimenting - anything less than 5
+		 * causes the channel to perform only a partial transfer which
+		 * leads to problems since we don't get DONE interrupt then.
+		 */
+		control = (5 << M2M_CONTROL_PWSC_SHIFT);
+		control |= M2M_CONTROL_NO_HDSK;
+
+		if (data->direction == DMA_MEM_TO_DEV) {
+			control |= M2M_CONTROL_DAH;
+			control |= M2M_CONTROL_TM_TX;
+			control |= M2M_CONTROL_RSS_SSPTX;
+		} else {
+			control |= M2M_CONTROL_SAH;
+			control |= M2M_CONTROL_TM_RX;
+			control |= M2M_CONTROL_RSS_SSPRX;
+		}
+		break;
+
+	case EP93XX_DMA_IDE:
+		/*
+		 * This IDE part is totally untested. Values below are taken
+		 * from the EP93xx Users's Guide and might not be correct.
+		 */
+		if (data->direction == DMA_MEM_TO_DEV) {
+			/* Worst case from the UG */
+			control = (3 << M2M_CONTROL_PWSC_SHIFT);
+			control |= M2M_CONTROL_DAH;
+			control |= M2M_CONTROL_TM_TX;
+		} else {
+			control = (2 << M2M_CONTROL_PWSC_SHIFT);
+			control |= M2M_CONTROL_SAH;
+			control |= M2M_CONTROL_TM_RX;
+		}
+
+		control |= M2M_CONTROL_NO_HDSK;
+		control |= M2M_CONTROL_RSS_IDE;
+		control |= M2M_CONTROL_PW_16;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	writel(control, edmac->regs + M2M_CONTROL);
+	return 0;
+}
+
+static void m2m_hw_shutdown(struct ep93xx_dma_chan *edmac)
+{
+	/* Just disable the channel */
+	writel(0, edmac->regs + M2M_CONTROL);
+}
+
+static void m2m_fill_desc(struct ep93xx_dma_chan *edmac)
+{
+	struct ep93xx_dma_desc *desc;
+
+	desc = ep93xx_dma_get_active(edmac);
+	if (!desc) {
+		dev_warn(chan2dev(edmac), "M2M: empty descriptor list\n");
+		return;
+	}
+
+	if (edmac->buffer == 0) {
+		writel(desc->src_addr, edmac->regs + M2M_SAR_BASE0);
+		writel(desc->dst_addr, edmac->regs + M2M_DAR_BASE0);
+		writel(desc->size, edmac->regs + M2M_BCR0);
+	} else {
+		writel(desc->src_addr, edmac->regs + M2M_SAR_BASE1);
+		writel(desc->dst_addr, edmac->regs + M2M_DAR_BASE1);
+		writel(desc->size, edmac->regs + M2M_BCR1);
+	}
+
+	edmac->buffer ^= 1;
+}
+
+static void m2m_hw_submit(struct ep93xx_dma_chan *edmac)
+{
+	struct ep93xx_dma_data *data = edmac->chan.private;
+	u32 control = readl(edmac->regs + M2M_CONTROL);
+
+	/*
+	 * Since we allow clients to configure PW (peripheral width) we always
+	 * clear PW bits here and then set them according what is given in
+	 * the runtime configuration.
+	 */
+	control &= ~M2M_CONTROL_PW_MASK;
+	control |= edmac->runtime_ctrl;
+
+	m2m_fill_desc(edmac);
+	control |= M2M_CONTROL_DONEINT;
+
+	if (ep93xx_dma_advance_active(edmac)) {
+		m2m_fill_desc(edmac);
+		control |= M2M_CONTROL_NFBINT;
+	}
+
+	/*
+	 * Now we can finally enable the channel. For M2M channel this must be
+	 * done _after_ the BCRx registers are programmed.
+	 */
+	control |= M2M_CONTROL_ENABLE;
+	writel(control, edmac->regs + M2M_CONTROL);
+
+	if (!data) {
+		/*
+		 * For memcpy channels the software trigger must be asserted
+		 * in order to start the memcpy operation.
+		 */
+		control |= M2M_CONTROL_START;
+		writel(control, edmac->regs + M2M_CONTROL);
+	}
+}
+
+/*
+ * According to EP93xx User's Guide, we should receive DONE interrupt when all
+ * M2M DMA controller transactions complete normally. This is not always the
+ * case - sometimes EP93xx M2M DMA asserts DONE interrupt when the DMA channel
+ * is still running (channel Buffer FSM in DMA_BUF_ON state, and channel
+ * Control FSM in DMA_MEM_RD state, observed at least in IDE-DMA operation).
+ * In effect, disabling the channel when only DONE bit is set could stop
+ * currently running DMA transfer. To avoid this, we use Buffer FSM and
+ * Control FSM to check current state of DMA channel.
+ */
+static int m2m_hw_interrupt(struct ep93xx_dma_chan *edmac)
+{
+	u32 status = readl(edmac->regs + M2M_STATUS);
+	u32 ctl_fsm = status & M2M_STATUS_CTL_MASK;
+	u32 buf_fsm = status & M2M_STATUS_BUF_MASK;
+	bool done = status & M2M_STATUS_DONE;
+	bool last_done;
+	u32 control;
+	struct ep93xx_dma_desc *desc;
+
+	/* Accept only DONE and NFB interrupts */
+	if (!(readl(edmac->regs + M2M_INTERRUPT) & M2M_INTERRUPT_MASK))
+		return INTERRUPT_UNKNOWN;
+
+	if (done) {
+		/* Clear the DONE bit */
+		writel(0, edmac->regs + M2M_INTERRUPT);
+	}
+
+	/*
+	 * Check whether we are done with descriptors or not. This, together
+	 * with DMA channel state, determines action to take in interrupt.
+	 */
+	desc = ep93xx_dma_get_active(edmac);
+	last_done = !desc || desc->txd.cookie;
+
+	/*
+	 * Use M2M DMA Buffer FSM and Control FSM to check current state of
+	 * DMA channel. Using DONE and NFB bits from channel status register
+	 * or bits from channel interrupt register is not reliable.
+	 */
+	if (!last_done &&
+	    (buf_fsm == M2M_STATUS_BUF_NO ||
+	     buf_fsm == M2M_STATUS_BUF_ON)) {
+		/*
+		 * Two buffers are ready for update when Buffer FSM is in
+		 * DMA_NO_BUF state. Only one buffer can be prepared without
+		 * disabling the channel or polling the DONE bit.
+		 * To simplify things, always prepare only one buffer.
+		 */
+		if (ep93xx_dma_advance_active(edmac)) {
+			m2m_fill_desc(edmac);
+			if (done && !edmac->chan.private) {
+				/* Software trigger for memcpy channel */
+				control = readl(edmac->regs + M2M_CONTROL);
+				control |= M2M_CONTROL_START;
+				writel(control, edmac->regs + M2M_CONTROL);
+			}
+			return INTERRUPT_NEXT_BUFFER;
+		} else {
+			last_done = true;
+		}
+	}
+
+	/*
+	 * Disable the channel only when Buffer FSM is in DMA_NO_BUF state
+	 * and Control FSM is in DMA_STALL state.
+	 */
+	if (last_done &&
+	    buf_fsm == M2M_STATUS_BUF_NO &&
+	    ctl_fsm == M2M_STATUS_CTL_STALL) {
+		/* Disable interrupts and the channel */
+		control = readl(edmac->regs + M2M_CONTROL);
+		control &= ~(M2M_CONTROL_DONEINT | M2M_CONTROL_NFBINT
+			    | M2M_CONTROL_ENABLE);
+		writel(control, edmac->regs + M2M_CONTROL);
+		return INTERRUPT_DONE;
+	}
+
+	/*
+	 * Nothing to do this time.
+	 */
+	return INTERRUPT_NEXT_BUFFER;
+}
+
+/*
+ * DMA engine API implementation
+ */
+
+static struct ep93xx_dma_desc *
+ep93xx_dma_desc_get(struct ep93xx_dma_chan *edmac)
+{
+	struct ep93xx_dma_desc *desc, *_desc;
+	struct ep93xx_dma_desc *ret = NULL;
+	unsigned long flags;
+
+	spin_lock_irqsave(&edmac->lock, flags);
+	list_for_each_entry_safe(desc, _desc, &edmac->free_list, node) {
+		if (async_tx_test_ack(&desc->txd)) {
+			list_del_init(&desc->node);
+
+			/* Re-initialize the descriptor */
+			desc->src_addr = 0;
+			desc->dst_addr = 0;
+			desc->size = 0;
+			desc->complete = false;
+			desc->txd.cookie = 0;
+			desc->txd.callback = NULL;
+			desc->txd.callback_param = NULL;
+
+			ret = desc;
+			break;
+		}
+	}
+	spin_unlock_irqrestore(&edmac->lock, flags);
+	return ret;
+}
+
+static void ep93xx_dma_desc_put(struct ep93xx_dma_chan *edmac,
+				struct ep93xx_dma_desc *desc)
+{
+	if (desc) {
+		unsigned long flags;
+
+		spin_lock_irqsave(&edmac->lock, flags);
+		list_splice_init(&desc->tx_list, &edmac->free_list);
+		list_add(&desc->node, &edmac->free_list);
+		spin_unlock_irqrestore(&edmac->lock, flags);
+	}
+}
+
+/**
+ * ep93xx_dma_advance_work - start processing the next pending transaction
+ * @edmac: channel
+ *
+ * If we have pending transactions queued and we are currently idling, this
+ * function takes the next queued transaction from the @edmac->queue and
+ * pushes it to the hardware for execution.
+ */
+static void ep93xx_dma_advance_work(struct ep93xx_dma_chan *edmac)
+{
+	struct ep93xx_dma_desc *new;
+	unsigned long flags;
+
+	spin_lock_irqsave(&edmac->lock, flags);
+	if (!list_empty(&edmac->active) || list_empty(&edmac->queue)) {
+		spin_unlock_irqrestore(&edmac->lock, flags);
+		return;
+	}
+
+	/* Take the next descriptor from the pending queue */
+	new = list_first_entry(&edmac->queue, struct ep93xx_dma_desc, node);
+	list_del_init(&new->node);
+
+	ep93xx_dma_set_active(edmac, new);
+
+	/* Push it to the hardware */
+	edmac->edma->hw_submit(edmac);
+	spin_unlock_irqrestore(&edmac->lock, flags);
+}
+
+static void ep93xx_dma_tasklet(struct tasklet_struct *t)
+{
+	struct ep93xx_dma_chan *edmac = from_tasklet(edmac, t, tasklet);
+	struct ep93xx_dma_desc *desc, *d;
+	struct dmaengine_desc_callback cb;
+	LIST_HEAD(list);
+
+	memset(&cb, 0, sizeof(cb));
+	spin_lock_irq(&edmac->lock);
+	/*
+	 * If dma_terminate_all() was called before we get to run, the active
+	 * list has become empty. If that happens we aren't supposed to do
+	 * anything more than call ep93xx_dma_advance_work().
+	 */
+	desc = ep93xx_dma_get_active(edmac);
+	if (desc) {
+		if (desc->complete) {
+			/* mark descriptor complete for non cyclic case only */
+			if (!test_bit(EP93XX_DMA_IS_CYCLIC, &edmac->flags))
+				dma_cookie_complete(&desc->txd);
+			list_splice_init(&edmac->active, &list);
+		}
+		dmaengine_desc_get_callback(&desc->txd, &cb);
+	}
+	spin_unlock_irq(&edmac->lock);
+
+	/* Pick up the next descriptor from the queue */
+	ep93xx_dma_advance_work(edmac);
+
+	/* Now we can release all the chained descriptors */
+	list_for_each_entry_safe(desc, d, &list, node) {
+		dma_descriptor_unmap(&desc->txd);
+		ep93xx_dma_desc_put(edmac, desc);
+	}
+
+	dmaengine_desc_callback_invoke(&cb, NULL);
+}
+
+static irqreturn_t ep93xx_dma_interrupt(int irq, void *dev_id)
+{
+	struct ep93xx_dma_chan *edmac = dev_id;
+	struct ep93xx_dma_desc *desc;
+	irqreturn_t ret = IRQ_HANDLED;
+
+	spin_lock(&edmac->lock);
+
+	desc = ep93xx_dma_get_active(edmac);
+	if (!desc) {
+		dev_warn(chan2dev(edmac),
+			 "got interrupt while active list is empty\n");
+		spin_unlock(&edmac->lock);
+		return IRQ_NONE;
+	}
+
+	switch (edmac->edma->hw_interrupt(edmac)) {
+	case INTERRUPT_DONE:
+		desc->complete = true;
+		tasklet_schedule(&edmac->tasklet);
+		break;
+
+	case INTERRUPT_NEXT_BUFFER:
+		if (test_bit(EP93XX_DMA_IS_CYCLIC, &edmac->flags))
+			tasklet_schedule(&edmac->tasklet);
+		break;
+
+	default:
+		dev_warn(chan2dev(edmac), "unknown interrupt!\n");
+		ret = IRQ_NONE;
+		break;
+	}
+
+	spin_unlock(&edmac->lock);
+	return ret;
+}
+
+/**
+ * ep93xx_dma_tx_submit - set the prepared descriptor(s) to be executed
+ * @tx: descriptor to be executed
+ *
+ * Function will execute given descriptor on the hardware or if the hardware
+ * is busy, queue the descriptor to be executed later on. Returns cookie which
+ * can be used to poll the status of the descriptor.
+ */
+static dma_cookie_t ep93xx_dma_tx_submit(struct dma_async_tx_descriptor *tx)
+{
+	struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(tx->chan);
+	struct ep93xx_dma_desc *desc;
+	dma_cookie_t cookie;
+	unsigned long flags;
+
+	spin_lock_irqsave(&edmac->lock, flags);
+	cookie = dma_cookie_assign(tx);
+
+	desc = container_of(tx, struct ep93xx_dma_desc, txd);
+
+	/*
+	 * If nothing is currently prosessed, we push this descriptor
+	 * directly to the hardware. Otherwise we put the descriptor
+	 * to the pending queue.
+	 */
+	if (list_empty(&edmac->active)) {
+		ep93xx_dma_set_active(edmac, desc);
+		edmac->edma->hw_submit(edmac);
+	} else {
+		list_add_tail(&desc->node, &edmac->queue);
+	}
+
+	spin_unlock_irqrestore(&edmac->lock, flags);
+	return cookie;
+}
+
+/**
+ * ep93xx_dma_alloc_chan_resources - allocate resources for the channel
+ * @chan: channel to allocate resources
+ *
+ * Function allocates necessary resources for the given DMA channel and
+ * returns number of allocated descriptors for the channel. Negative errno
+ * is returned in case of failure.
+ */
+static int ep93xx_dma_alloc_chan_resources(struct dma_chan *chan)
+{
+	struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan);
+	struct ep93xx_dma_data *data = chan->private;
+	const char *name = dma_chan_name(chan);
+	int ret, i;
+
+	/* Sanity check the channel parameters */
+	if (!edmac->edma->m2m) {
+		if (!data)
+			return -EINVAL;
+		if (data->port < EP93XX_DMA_I2S1 ||
+		    data->port > EP93XX_DMA_IRDA)
+			return -EINVAL;
+		if (data->direction != ep93xx_dma_chan_direction(chan))
+			return -EINVAL;
+	} else {
+		if (data) {
+			switch (data->port) {
+			case EP93XX_DMA_SSP:
+			case EP93XX_DMA_IDE:
+				if (!is_slave_direction(data->direction))
+					return -EINVAL;
+				break;
+			default:
+				return -EINVAL;
+			}
+		}
+	}
+
+	if (data && data->name)
+		name = data->name;
+
+	ret = clk_prepare_enable(edmac->clk);
+	if (ret)
+		return ret;
+
+	ret = request_irq(edmac->irq, ep93xx_dma_interrupt, 0, name, edmac);
+	if (ret)
+		goto fail_clk_disable;
+
+	spin_lock_irq(&edmac->lock);
+	dma_cookie_init(&edmac->chan);
+	ret = edmac->edma->hw_setup(edmac);
+	spin_unlock_irq(&edmac->lock);
+
+	if (ret)
+		goto fail_free_irq;
+
+	for (i = 0; i < DMA_MAX_CHAN_DESCRIPTORS; i++) {
+		struct ep93xx_dma_desc *desc;
+
+		desc = kzalloc(sizeof(*desc), GFP_KERNEL);
+		if (!desc) {
+			dev_warn(chan2dev(edmac), "not enough descriptors\n");
+			break;
+		}
+
+		INIT_LIST_HEAD(&desc->tx_list);
+
+		dma_async_tx_descriptor_init(&desc->txd, chan);
+		desc->txd.flags = DMA_CTRL_ACK;
+		desc->txd.tx_submit = ep93xx_dma_tx_submit;
+
+		ep93xx_dma_desc_put(edmac, desc);
+	}
+
+	return i;
+
+fail_free_irq:
+	free_irq(edmac->irq, edmac);
+fail_clk_disable:
+	clk_disable_unprepare(edmac->clk);
+
+	return ret;
+}
+
+/**
+ * ep93xx_dma_free_chan_resources - release resources for the channel
+ * @chan: channel
+ *
+ * Function releases all the resources allocated for the given channel.
+ * The channel must be idle when this is called.
+ */
+static void ep93xx_dma_free_chan_resources(struct dma_chan *chan)
+{
+	struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan);
+	struct ep93xx_dma_desc *desc, *d;
+	unsigned long flags;
+	LIST_HEAD(list);
+
+	BUG_ON(!list_empty(&edmac->active));
+	BUG_ON(!list_empty(&edmac->queue));
+
+	spin_lock_irqsave(&edmac->lock, flags);
+	edmac->edma->hw_shutdown(edmac);
+	edmac->runtime_addr = 0;
+	edmac->runtime_ctrl = 0;
+	edmac->buffer = 0;
+	list_splice_init(&edmac->free_list, &list);
+	spin_unlock_irqrestore(&edmac->lock, flags);
+
+	list_for_each_entry_safe(desc, d, &list, node)
+		kfree(desc);
+
+	clk_disable_unprepare(edmac->clk);
+	free_irq(edmac->irq, edmac);
+}
+
+/**
+ * ep93xx_dma_prep_dma_memcpy - prepare a memcpy DMA operation
+ * @chan: channel
+ * @dest: destination bus address
+ * @src: source bus address
+ * @len: size of the transaction
+ * @flags: flags for the descriptor
+ *
+ * Returns a valid DMA descriptor or %NULL in case of failure.
+ */
+static struct dma_async_tx_descriptor *
+ep93xx_dma_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dest,
+			   dma_addr_t src, size_t len, unsigned long flags)
+{
+	struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan);
+	struct ep93xx_dma_desc *desc, *first;
+	size_t bytes, offset;
+
+	first = NULL;
+	for (offset = 0; offset < len; offset += bytes) {
+		desc = ep93xx_dma_desc_get(edmac);
+		if (!desc) {
+			dev_warn(chan2dev(edmac), "couldn't get descriptor\n");
+			goto fail;
+		}
+
+		bytes = min_t(size_t, len - offset, DMA_MAX_CHAN_BYTES);
+
+		desc->src_addr = src + offset;
+		desc->dst_addr = dest + offset;
+		desc->size = bytes;
+
+		if (!first)
+			first = desc;
+		else
+			list_add_tail(&desc->node, &first->tx_list);
+	}
+
+	first->txd.cookie = -EBUSY;
+	first->txd.flags = flags;
+
+	return &first->txd;
+fail:
+	ep93xx_dma_desc_put(edmac, first);
+	return NULL;
+}
+
+/**
+ * ep93xx_dma_prep_slave_sg - prepare a slave DMA operation
+ * @chan: channel
+ * @sgl: list of buffers to transfer
+ * @sg_len: number of entries in @sgl
+ * @dir: direction of tha DMA transfer
+ * @flags: flags for the descriptor
+ * @context: operation context (ignored)
+ *
+ * Returns a valid DMA descriptor or %NULL in case of failure.
+ */
+static struct dma_async_tx_descriptor *
+ep93xx_dma_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
+			 unsigned int sg_len, enum dma_transfer_direction dir,
+			 unsigned long flags, void *context)
+{
+	struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan);
+	struct ep93xx_dma_desc *desc, *first;
+	struct scatterlist *sg;
+	int i;
+
+	if (!edmac->edma->m2m && dir != ep93xx_dma_chan_direction(chan)) {
+		dev_warn(chan2dev(edmac),
+			 "channel was configured with different direction\n");
+		return NULL;
+	}
+
+	if (test_bit(EP93XX_DMA_IS_CYCLIC, &edmac->flags)) {
+		dev_warn(chan2dev(edmac),
+			 "channel is already used for cyclic transfers\n");
+		return NULL;
+	}
+
+	ep93xx_dma_slave_config_write(chan, dir, &edmac->slave_config);
+
+	first = NULL;
+	for_each_sg(sgl, sg, sg_len, i) {
+		size_t len = sg_dma_len(sg);
+
+		if (len > DMA_MAX_CHAN_BYTES) {
+			dev_warn(chan2dev(edmac), "too big transfer size %zu\n",
+				 len);
+			goto fail;
+		}
+
+		desc = ep93xx_dma_desc_get(edmac);
+		if (!desc) {
+			dev_warn(chan2dev(edmac), "couldn't get descriptor\n");
+			goto fail;
+		}
+
+		if (dir == DMA_MEM_TO_DEV) {
+			desc->src_addr = sg_dma_address(sg);
+			desc->dst_addr = edmac->runtime_addr;
+		} else {
+			desc->src_addr = edmac->runtime_addr;
+			desc->dst_addr = sg_dma_address(sg);
+		}
+		desc->size = len;
+
+		if (!first)
+			first = desc;
+		else
+			list_add_tail(&desc->node, &first->tx_list);
+	}
+
+	first->txd.cookie = -EBUSY;
+	first->txd.flags = flags;
+
+	return &first->txd;
+
+fail:
+	ep93xx_dma_desc_put(edmac, first);
+	return NULL;
+}
+
+/**
+ * ep93xx_dma_prep_dma_cyclic - prepare a cyclic DMA operation
+ * @chan: channel
+ * @dma_addr: DMA mapped address of the buffer
+ * @buf_len: length of the buffer (in bytes)
+ * @period_len: length of a single period
+ * @dir: direction of the operation
+ * @flags: tx descriptor status flags
+ *
+ * Prepares a descriptor for cyclic DMA operation. This means that once the
+ * descriptor is submitted, we will be submitting in a @period_len sized
+ * buffers and calling callback once the period has been elapsed. Transfer
+ * terminates only when client calls dmaengine_terminate_all() for this
+ * channel.
+ *
+ * Returns a valid DMA descriptor or %NULL in case of failure.
+ */
+static struct dma_async_tx_descriptor *
+ep93xx_dma_prep_dma_cyclic(struct dma_chan *chan, dma_addr_t dma_addr,
+			   size_t buf_len, size_t period_len,
+			   enum dma_transfer_direction dir, unsigned long flags)
+{
+	struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan);
+	struct ep93xx_dma_desc *desc, *first;
+	size_t offset = 0;
+
+	if (!edmac->edma->m2m && dir != ep93xx_dma_chan_direction(chan)) {
+		dev_warn(chan2dev(edmac),
+			 "channel was configured with different direction\n");
+		return NULL;
+	}
+
+	if (test_and_set_bit(EP93XX_DMA_IS_CYCLIC, &edmac->flags)) {
+		dev_warn(chan2dev(edmac),
+			 "channel is already used for cyclic transfers\n");
+		return NULL;
+	}
+
+	if (period_len > DMA_MAX_CHAN_BYTES) {
+		dev_warn(chan2dev(edmac), "too big period length %zu\n",
+			 period_len);
+		return NULL;
+	}
+
+	ep93xx_dma_slave_config_write(chan, dir, &edmac->slave_config);
+
+	/* Split the buffer into period size chunks */
+	first = NULL;
+	for (offset = 0; offset < buf_len; offset += period_len) {
+		desc = ep93xx_dma_desc_get(edmac);
+		if (!desc) {
+			dev_warn(chan2dev(edmac), "couldn't get descriptor\n");
+			goto fail;
+		}
+
+		if (dir == DMA_MEM_TO_DEV) {
+			desc->src_addr = dma_addr + offset;
+			desc->dst_addr = edmac->runtime_addr;
+		} else {
+			desc->src_addr = edmac->runtime_addr;
+			desc->dst_addr = dma_addr + offset;
+		}
+
+		desc->size = period_len;
+
+		if (!first)
+			first = desc;
+		else
+			list_add_tail(&desc->node, &first->tx_list);
+	}
+
+	first->txd.cookie = -EBUSY;
+
+	return &first->txd;
+
+fail:
+	ep93xx_dma_desc_put(edmac, first);
+	return NULL;
+}
+
+/**
+ * ep93xx_dma_synchronize - Synchronizes the termination of transfers to the
+ * current context.
+ * @chan: channel
+ *
+ * Synchronizes the DMA channel termination to the current context. When this
+ * function returns it is guaranteed that all transfers for previously issued
+ * descriptors have stopped and it is safe to free the memory associated
+ * with them. Furthermore it is guaranteed that all complete callback functions
+ * for a previously submitted descriptor have finished running and it is safe to
+ * free resources accessed from within the complete callbacks.
+ */
+static void ep93xx_dma_synchronize(struct dma_chan *chan)
+{
+	struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan);
+
+	if (edmac->edma->hw_synchronize)
+		edmac->edma->hw_synchronize(edmac);
+}
+
+/**
+ * ep93xx_dma_terminate_all - terminate all transactions
+ * @chan: channel
+ *
+ * Stops all DMA transactions. All descriptors are put back to the
+ * @edmac->free_list and callbacks are _not_ called.
+ */
+static int ep93xx_dma_terminate_all(struct dma_chan *chan)
+{
+	struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan);
+	struct ep93xx_dma_desc *desc, *_d;
+	unsigned long flags;
+	LIST_HEAD(list);
+
+	spin_lock_irqsave(&edmac->lock, flags);
+	/* First we disable and flush the DMA channel */
+	edmac->edma->hw_shutdown(edmac);
+	clear_bit(EP93XX_DMA_IS_CYCLIC, &edmac->flags);
+	list_splice_init(&edmac->active, &list);
+	list_splice_init(&edmac->queue, &list);
+	/*
+	 * We then re-enable the channel. This way we can continue submitting
+	 * the descriptors by just calling ->hw_submit() again.
+	 */
+	edmac->edma->hw_setup(edmac);
+	spin_unlock_irqrestore(&edmac->lock, flags);
+
+	list_for_each_entry_safe(desc, _d, &list, node)
+		ep93xx_dma_desc_put(edmac, desc);
+
+	return 0;
+}
+
+static int ep93xx_dma_slave_config(struct dma_chan *chan,
+				   struct dma_slave_config *config)
+{
+	struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan);
+
+	memcpy(&edmac->slave_config, config, sizeof(*config));
+
+	return 0;
+}
+
+static int ep93xx_dma_slave_config_write(struct dma_chan *chan,
+					 enum dma_transfer_direction dir,
+					 struct dma_slave_config *config)
+{
+	struct ep93xx_dma_chan *edmac = to_ep93xx_dma_chan(chan);
+	enum dma_slave_buswidth width;
+	unsigned long flags;
+	u32 addr, ctrl;
+
+	if (!edmac->edma->m2m)
+		return -EINVAL;
+
+	switch (dir) {
+	case DMA_DEV_TO_MEM:
+		width = config->src_addr_width;
+		addr = config->src_addr;
+		break;
+
+	case DMA_MEM_TO_DEV:
+		width = config->dst_addr_width;
+		addr = config->dst_addr;
+		break;
+
+	default:
+		return -EINVAL;
+	}
+
+	switch (width) {
+	case DMA_SLAVE_BUSWIDTH_1_BYTE:
+		ctrl = 0;
+		break;
+	case DMA_SLAVE_BUSWIDTH_2_BYTES:
+		ctrl = M2M_CONTROL_PW_16;
+		break;
+	case DMA_SLAVE_BUSWIDTH_4_BYTES:
+		ctrl = M2M_CONTROL_PW_32;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	spin_lock_irqsave(&edmac->lock, flags);
+	edmac->runtime_addr = addr;
+	edmac->runtime_ctrl = ctrl;
+	spin_unlock_irqrestore(&edmac->lock, flags);
+
+	return 0;
+}
+
+/**
+ * ep93xx_dma_tx_status - check if a transaction is completed
+ * @chan: channel
+ * @cookie: transaction specific cookie
+ * @state: state of the transaction is stored here if given
+ *
+ * This function can be used to query state of a given transaction.
+ */
+static enum dma_status ep93xx_dma_tx_status(struct dma_chan *chan,
+					    dma_cookie_t cookie,
+					    struct dma_tx_state *state)
+{
+	return dma_cookie_status(chan, cookie, state);
+}
+
+/**
+ * ep93xx_dma_issue_pending - push pending transactions to the hardware
+ * @chan: channel
+ *
+ * When this function is called, all pending transactions are pushed to the
+ * hardware and executed.
+ */
+static void ep93xx_dma_issue_pending(struct dma_chan *chan)
+{
+	ep93xx_dma_advance_work(to_ep93xx_dma_chan(chan));
+}
+
+static int __init ep93xx_dma_probe(struct platform_device *pdev)
+{
+	struct ep93xx_dma_platform_data *pdata = dev_get_platdata(&pdev->dev);
+	struct ep93xx_dma_engine *edma;
+	struct dma_device *dma_dev;
+	size_t edma_size;
+	int ret, i;
+
+	edma_size = pdata->num_channels * sizeof(struct ep93xx_dma_chan);
+	edma = kzalloc(sizeof(*edma) + edma_size, GFP_KERNEL);
+	if (!edma)
+		return -ENOMEM;
+
+	dma_dev = &edma->dma_dev;
+	edma->m2m = platform_get_device_id(pdev)->driver_data;
+	edma->num_channels = pdata->num_channels;
+
+	INIT_LIST_HEAD(&dma_dev->channels);
+	for (i = 0; i < pdata->num_channels; i++) {
+		const struct ep93xx_dma_chan_data *cdata = &pdata->channels[i];
+		struct ep93xx_dma_chan *edmac = &edma->channels[i];
+
+		edmac->chan.device = dma_dev;
+		edmac->regs = cdata->base;
+		edmac->irq = cdata->irq;
+		edmac->edma = edma;
+
+		edmac->clk = clk_get(NULL, cdata->name);
+		if (IS_ERR(edmac->clk)) {
+			dev_warn(&pdev->dev, "failed to get clock for %s\n",
+				 cdata->name);
+			continue;
+		}
+
+		spin_lock_init(&edmac->lock);
+		INIT_LIST_HEAD(&edmac->active);
+		INIT_LIST_HEAD(&edmac->queue);
+		INIT_LIST_HEAD(&edmac->free_list);
+		tasklet_setup(&edmac->tasklet, ep93xx_dma_tasklet);
+
+		list_add_tail(&edmac->chan.device_node,
+			      &dma_dev->channels);
+	}
+
+	dma_cap_zero(dma_dev->cap_mask);
+	dma_cap_set(DMA_SLAVE, dma_dev->cap_mask);
+	dma_cap_set(DMA_CYCLIC, dma_dev->cap_mask);
+
+	dma_dev->dev = &pdev->dev;
+	dma_dev->device_alloc_chan_resources = ep93xx_dma_alloc_chan_resources;
+	dma_dev->device_free_chan_resources = ep93xx_dma_free_chan_resources;
+	dma_dev->device_prep_slave_sg = ep93xx_dma_prep_slave_sg;
+	dma_dev->device_prep_dma_cyclic = ep93xx_dma_prep_dma_cyclic;
+	dma_dev->device_config = ep93xx_dma_slave_config;
+	dma_dev->device_synchronize = ep93xx_dma_synchronize;
+	dma_dev->device_terminate_all = ep93xx_dma_terminate_all;
+	dma_dev->device_issue_pending = ep93xx_dma_issue_pending;
+	dma_dev->device_tx_status = ep93xx_dma_tx_status;
+
+	dma_set_max_seg_size(dma_dev->dev, DMA_MAX_CHAN_BYTES);
+
+	if (edma->m2m) {
+		dma_cap_set(DMA_MEMCPY, dma_dev->cap_mask);
+		dma_dev->device_prep_dma_memcpy = ep93xx_dma_prep_dma_memcpy;
+
+		edma->hw_setup = m2m_hw_setup;
+		edma->hw_shutdown = m2m_hw_shutdown;
+		edma->hw_submit = m2m_hw_submit;
+		edma->hw_interrupt = m2m_hw_interrupt;
+	} else {
+		dma_cap_set(DMA_PRIVATE, dma_dev->cap_mask);
+
+		edma->hw_synchronize = m2p_hw_synchronize;
+		edma->hw_setup = m2p_hw_setup;
+		edma->hw_shutdown = m2p_hw_shutdown;
+		edma->hw_submit = m2p_hw_submit;
+		edma->hw_interrupt = m2p_hw_interrupt;
+	}
+
+	ret = dma_async_device_register(dma_dev);
+	if (unlikely(ret)) {
+		for (i = 0; i < edma->num_channels; i++) {
+			struct ep93xx_dma_chan *edmac = &edma->channels[i];
+			if (!IS_ERR_OR_NULL(edmac->clk))
+				clk_put(edmac->clk);
+		}
+		kfree(edma);
+	} else {
+		dev_info(dma_dev->dev, "EP93xx M2%s DMA ready\n",
+			 edma->m2m ? "M" : "P");
+	}
+
+	return ret;
+}
+
+static const struct platform_device_id ep93xx_dma_driver_ids[] = {
+	{ "ep93xx-dma-m2p", 0 },
+	{ "ep93xx-dma-m2m", 1 },
+	{ },
+};
+
+static struct platform_driver ep93xx_dma_driver = {
+	.driver		= {
+		.name	= "ep93xx-dma",
+	},
+	.id_table	= ep93xx_dma_driver_ids,
+};
+
+static int __init ep93xx_dma_module_init(void)
+{
+	return platform_driver_probe(&ep93xx_dma_driver, ep93xx_dma_probe);
+}
+subsys_initcall(ep93xx_dma_module_init);
+
+MODULE_AUTHOR("Mika Westerberg <mika.westerberg@iki.fi>");
+MODULE_DESCRIPTION("EP93xx DMA driver");
+MODULE_LICENSE("GPL");