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, 971 insertions, 0 deletions

diff --git a/drivers/block/swim.c b/drivers/block/swim.c
new file mode 100644
index 000000000..42b4b6828
--- /dev/null
+++ b/drivers/block/swim.c
@@ -0,0 +1,971 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for SWIM (Sander Woz Integrated Machine) floppy controller
+ *
+ * Copyright (C) 2004,2008 Laurent Vivier <Laurent@lvivier.info>
+ *
+ * based on Alastair Bridgewater SWIM analysis, 2001
+ * based on SWIM3 driver (c) Paul Mackerras, 1996
+ * based on netBSD IWM driver (c) 1997, 1998 Hauke Fath.
+ *
+ * 2004-08-21 (lv) - Initial implementation
+ * 2008-10-30 (lv) - Port to 2.6
+ */
+
+#include <linux/module.h>
+#include <linux/fd.h>
+#include <linux/slab.h>
+#include <linux/blk-mq.h>
+#include <linux/major.h>
+#include <linux/mutex.h>
+#include <linux/hdreg.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+
+#include <asm/mac_via.h>
+
+#define CARDNAME "swim"
+
+struct sector_header {
+	unsigned char side;
+	unsigned char track;
+	unsigned char sector;
+	unsigned char size;
+	unsigned char crc0;
+	unsigned char crc1;
+} __attribute__((packed));
+
+#define DRIVER_VERSION "Version 0.2 (2008-10-30)"
+
+#define REG(x)	unsigned char x, x ## _pad[0x200 - 1];
+
+struct swim {
+	REG(write_data)
+	REG(write_mark)
+	REG(write_CRC)
+	REG(write_parameter)
+	REG(write_phase)
+	REG(write_setup)
+	REG(write_mode0)
+	REG(write_mode1)
+
+	REG(read_data)
+	REG(read_mark)
+	REG(read_error)
+	REG(read_parameter)
+	REG(read_phase)
+	REG(read_setup)
+	REG(read_status)
+	REG(read_handshake)
+} __attribute__((packed));
+
+#define swim_write(base, reg, v) 	out_8(&(base)->write_##reg, (v))
+#define swim_read(base, reg)		in_8(&(base)->read_##reg)
+
+/* IWM registers */
+
+struct iwm {
+	REG(ph0L)
+	REG(ph0H)
+	REG(ph1L)
+	REG(ph1H)
+	REG(ph2L)
+	REG(ph2H)
+	REG(ph3L)
+	REG(ph3H)
+	REG(mtrOff)
+	REG(mtrOn)
+	REG(intDrive)
+	REG(extDrive)
+	REG(q6L)
+	REG(q6H)
+	REG(q7L)
+	REG(q7H)
+} __attribute__((packed));
+
+#define iwm_write(base, reg, v) 	out_8(&(base)->reg, (v))
+#define iwm_read(base, reg)		in_8(&(base)->reg)
+
+/* bits in phase register */
+
+#define SEEK_POSITIVE	0x070
+#define SEEK_NEGATIVE	0x074
+#define STEP		0x071
+#define MOTOR_ON	0x072
+#define MOTOR_OFF	0x076
+#define INDEX		0x073
+#define EJECT		0x077
+#define SETMFM		0x171
+#define SETGCR		0x175
+
+#define RELAX		0x033
+#define LSTRB		0x008
+
+#define CA_MASK		0x077
+
+/* Select values for swim_select and swim_readbit */
+
+#define READ_DATA_0	0x074
+#define ONEMEG_DRIVE	0x075
+#define SINGLE_SIDED	0x076
+#define DRIVE_PRESENT	0x077
+#define DISK_IN		0x170
+#define WRITE_PROT	0x171
+#define TRACK_ZERO	0x172
+#define TACHO		0x173
+#define READ_DATA_1	0x174
+#define GCR_MODE	0x175
+#define SEEK_COMPLETE	0x176
+#define TWOMEG_MEDIA	0x177
+
+/* Bits in handshake register */
+
+#define MARK_BYTE	0x01
+#define CRC_ZERO	0x02
+#define RDDATA		0x04
+#define SENSE		0x08
+#define MOTEN		0x10
+#define ERROR		0x20
+#define DAT2BYTE	0x40
+#define DAT1BYTE	0x80
+
+/* bits in setup register */
+
+#define S_INV_WDATA	0x01
+#define S_3_5_SELECT	0x02
+#define S_GCR		0x04
+#define S_FCLK_DIV2	0x08
+#define S_ERROR_CORR	0x10
+#define S_IBM_DRIVE	0x20
+#define S_GCR_WRITE	0x40
+#define S_TIMEOUT	0x80
+
+/* bits in mode register */
+
+#define CLFIFO		0x01
+#define ENBL1		0x02
+#define ENBL2		0x04
+#define ACTION		0x08
+#define WRITE_MODE	0x10
+#define HEDSEL		0x20
+#define MOTON		0x80
+
+/*----------------------------------------------------------------------------*/
+
+enum drive_location {
+	INTERNAL_DRIVE = 0x02,
+	EXTERNAL_DRIVE = 0x04,
+};
+
+enum media_type {
+	DD_MEDIA,
+	HD_MEDIA,
+};
+
+struct floppy_state {
+
+	/* physical properties */
+
+	enum drive_location location;	/* internal or external drive */
+	int		 head_number;	/* single- or double-sided drive */
+
+	/* media */
+
+	int		 disk_in;
+	int		 ejected;
+	enum media_type	 type;
+	int		 write_protected;
+
+	int		 total_secs;
+	int		 secpercyl;
+	int		 secpertrack;
+
+	/* in-use information */
+
+	int		track;
+	int		ref_count;
+	bool registered;
+
+	struct gendisk *disk;
+	struct blk_mq_tag_set tag_set;
+
+	/* parent controller */
+
+	struct swim_priv *swd;
+};
+
+enum motor_action {
+	OFF,
+	ON,
+};
+
+enum head {
+	LOWER_HEAD = 0,
+	UPPER_HEAD = 1,
+};
+
+#define FD_MAX_UNIT	2
+
+struct swim_priv {
+	struct swim __iomem *base;
+	spinlock_t lock;
+	int floppy_count;
+	struct floppy_state unit[FD_MAX_UNIT];
+};
+
+extern int swim_read_sector_header(struct swim __iomem *base,
+				   struct sector_header *header);
+extern int swim_read_sector_data(struct swim __iomem *base,
+				 unsigned char *data);
+
+static DEFINE_MUTEX(swim_mutex);
+static inline void set_swim_mode(struct swim __iomem *base, int enable)
+{
+	struct iwm __iomem *iwm_base;
+	unsigned long flags;
+
+	if (!enable) {
+		swim_write(base, mode0, 0xf8);
+		return;
+	}
+
+	iwm_base = (struct iwm __iomem *)base;
+	local_irq_save(flags);
+
+	iwm_read(iwm_base, q7L);
+	iwm_read(iwm_base, mtrOff);
+	iwm_read(iwm_base, q6H);
+
+	iwm_write(iwm_base, q7H, 0x57);
+	iwm_write(iwm_base, q7H, 0x17);
+	iwm_write(iwm_base, q7H, 0x57);
+	iwm_write(iwm_base, q7H, 0x57);
+
+	local_irq_restore(flags);
+}
+
+static inline int get_swim_mode(struct swim __iomem *base)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+
+	swim_write(base, phase, 0xf5);
+	if (swim_read(base, phase) != 0xf5)
+		goto is_iwm;
+	swim_write(base, phase, 0xf6);
+	if (swim_read(base, phase) != 0xf6)
+		goto is_iwm;
+	swim_write(base, phase, 0xf7);
+	if (swim_read(base, phase) != 0xf7)
+		goto is_iwm;
+	local_irq_restore(flags);
+	return 1;
+is_iwm:
+	local_irq_restore(flags);
+	return 0;
+}
+
+static inline void swim_select(struct swim __iomem *base, int sel)
+{
+	swim_write(base, phase, RELAX);
+
+	via1_set_head(sel & 0x100);
+
+	swim_write(base, phase, sel & CA_MASK);
+}
+
+static inline void swim_action(struct swim __iomem *base, int action)
+{
+	unsigned long flags;
+
+	local_irq_save(flags);
+
+	swim_select(base, action);
+	udelay(1);
+	swim_write(base, phase, (LSTRB<<4) | LSTRB);
+	udelay(1);
+	swim_write(base, phase, (LSTRB<<4) | ((~LSTRB) & 0x0F));
+	udelay(1);
+
+	local_irq_restore(flags);
+}
+
+static inline int swim_readbit(struct swim __iomem *base, int bit)
+{
+	int stat;
+
+	swim_select(base, bit);
+
+	udelay(10);
+
+	stat = swim_read(base, handshake);
+
+	return (stat & SENSE) == 0;
+}
+
+static inline void swim_drive(struct swim __iomem *base,
+			      enum drive_location location)
+{
+	if (location == INTERNAL_DRIVE) {
+		swim_write(base, mode0, EXTERNAL_DRIVE); /* clear drive 1 bit */
+		swim_write(base, mode1, INTERNAL_DRIVE); /* set drive 0 bit */
+	} else if (location == EXTERNAL_DRIVE) {
+		swim_write(base, mode0, INTERNAL_DRIVE); /* clear drive 0 bit */
+		swim_write(base, mode1, EXTERNAL_DRIVE); /* set drive 1 bit */
+	}
+}
+
+static inline void swim_motor(struct swim __iomem *base,
+			      enum motor_action action)
+{
+	if (action == ON) {
+		int i;
+
+		swim_action(base, MOTOR_ON);
+
+		for (i = 0; i < 2*HZ; i++) {
+			swim_select(base, RELAX);
+			if (swim_readbit(base, MOTOR_ON))
+				break;
+			set_current_state(TASK_INTERRUPTIBLE);
+			schedule_timeout(1);
+		}
+	} else if (action == OFF) {
+		swim_action(base, MOTOR_OFF);
+		swim_select(base, RELAX);
+	}
+}
+
+static inline void swim_eject(struct swim __iomem *base)
+{
+	int i;
+
+	swim_action(base, EJECT);
+
+	for (i = 0; i < 2*HZ; i++) {
+		swim_select(base, RELAX);
+		if (!swim_readbit(base, DISK_IN))
+			break;
+		set_current_state(TASK_INTERRUPTIBLE);
+		schedule_timeout(1);
+	}
+	swim_select(base, RELAX);
+}
+
+static inline void swim_head(struct swim __iomem *base, enum head head)
+{
+	/* wait drive is ready */
+
+	if (head == UPPER_HEAD)
+		swim_select(base, READ_DATA_1);
+	else if (head == LOWER_HEAD)
+		swim_select(base, READ_DATA_0);
+}
+
+static inline int swim_step(struct swim __iomem *base)
+{
+	int wait;
+
+	swim_action(base, STEP);
+
+	for (wait = 0; wait < HZ; wait++) {
+
+		set_current_state(TASK_INTERRUPTIBLE);
+		schedule_timeout(1);
+
+		swim_select(base, RELAX);
+		if (!swim_readbit(base, STEP))
+			return 0;
+	}
+	return -1;
+}
+
+static inline int swim_track00(struct swim __iomem *base)
+{
+	int try;
+
+	swim_action(base, SEEK_NEGATIVE);
+
+	for (try = 0; try < 100; try++) {
+
+		swim_select(base, RELAX);
+		if (swim_readbit(base, TRACK_ZERO))
+			break;
+
+		if (swim_step(base))
+			return -1;
+	}
+
+	if (swim_readbit(base, TRACK_ZERO))
+		return 0;
+
+	return -1;
+}
+
+static inline int swim_seek(struct swim __iomem *base, int step)
+{
+	if (step == 0)
+		return 0;
+
+	if (step < 0) {
+		swim_action(base, SEEK_NEGATIVE);
+		step = -step;
+	} else
+		swim_action(base, SEEK_POSITIVE);
+
+	for ( ; step > 0; step--) {
+		if (swim_step(base))
+			return -1;
+	}
+
+	return 0;
+}
+
+static inline int swim_track(struct floppy_state *fs,  int track)
+{
+	struct swim __iomem *base = fs->swd->base;
+	int ret;
+
+	ret = swim_seek(base, track - fs->track);
+
+	if (ret == 0)
+		fs->track = track;
+	else {
+		swim_track00(base);
+		fs->track = 0;
+	}
+
+	return ret;
+}
+
+static int floppy_eject(struct floppy_state *fs)
+{
+	struct swim __iomem *base = fs->swd->base;
+
+	swim_drive(base, fs->location);
+	swim_motor(base, OFF);
+	swim_eject(base);
+
+	fs->disk_in = 0;
+	fs->ejected = 1;
+
+	return 0;
+}
+
+static inline int swim_read_sector(struct floppy_state *fs,
+				   int side, int track,
+				   int sector, unsigned char *buffer)
+{
+	struct swim __iomem *base = fs->swd->base;
+	unsigned long flags;
+	struct sector_header header;
+	int ret = -1;
+	short i;
+
+	swim_track(fs, track);
+
+	swim_write(base, mode1, MOTON);
+	swim_head(base, side);
+	swim_write(base, mode0, side);
+
+	local_irq_save(flags);
+	for (i = 0; i < 36; i++) {
+		ret = swim_read_sector_header(base, &header);
+		if (!ret && (header.sector == sector)) {
+			/* found */
+
+			ret = swim_read_sector_data(base, buffer);
+			break;
+		}
+	}
+	local_irq_restore(flags);
+
+	swim_write(base, mode0, MOTON);
+
+	if ((header.side != side)  || (header.track != track) ||
+	     (header.sector != sector))
+		return 0;
+
+	return ret;
+}
+
+static blk_status_t floppy_read_sectors(struct floppy_state *fs,
+			       int req_sector, int sectors_nb,
+			       unsigned char *buffer)
+{
+	struct swim __iomem *base = fs->swd->base;
+	int ret;
+	int side, track, sector;
+	int i, try;
+
+
+	swim_drive(base, fs->location);
+	for (i = req_sector; i < req_sector + sectors_nb; i++) {
+		int x;
+		track = i / fs->secpercyl;
+		x = i % fs->secpercyl;
+		side = x / fs->secpertrack;
+		sector = x % fs->secpertrack + 1;
+
+		try = 5;
+		do {
+			ret = swim_read_sector(fs, side, track, sector,
+						buffer);
+			if (try-- == 0)
+				return BLK_STS_IOERR;
+		} while (ret != 512);
+
+		buffer += ret;
+	}
+
+	return 0;
+}
+
+static blk_status_t swim_queue_rq(struct blk_mq_hw_ctx *hctx,
+				  const struct blk_mq_queue_data *bd)
+{
+	struct floppy_state *fs = hctx->queue->queuedata;
+	struct swim_priv *swd = fs->swd;
+	struct request *req = bd->rq;
+	blk_status_t err;
+
+	if (!spin_trylock_irq(&swd->lock))
+		return BLK_STS_DEV_RESOURCE;
+
+	blk_mq_start_request(req);
+
+	if (!fs->disk_in || rq_data_dir(req) == WRITE) {
+		err = BLK_STS_IOERR;
+		goto out;
+	}
+
+	do {
+		err = floppy_read_sectors(fs, blk_rq_pos(req),
+					  blk_rq_cur_sectors(req),
+					  bio_data(req->bio));
+	} while (blk_update_request(req, err, blk_rq_cur_bytes(req)));
+	__blk_mq_end_request(req, err);
+
+	err = BLK_STS_OK;
+out:
+	spin_unlock_irq(&swd->lock);
+	return err;
+
+}
+
+static struct floppy_struct floppy_type[4] = {
+	{    0,  0, 0,  0, 0, 0x00, 0x00, 0x00, 0x00, NULL }, /* no testing   */
+	{  720,  9, 1, 80, 0, 0x2A, 0x02, 0xDF, 0x50, NULL }, /* 360KB SS 3.5"*/
+	{ 1440,  9, 2, 80, 0, 0x2A, 0x02, 0xDF, 0x50, NULL }, /* 720KB 3.5"   */
+	{ 2880, 18, 2, 80, 0, 0x1B, 0x00, 0xCF, 0x6C, NULL }, /* 1.44MB 3.5"  */
+};
+
+static int get_floppy_geometry(struct floppy_state *fs, int type,
+			       struct floppy_struct **g)
+{
+	if (type >= ARRAY_SIZE(floppy_type))
+		return -EINVAL;
+
+	if (type)
+		*g = &floppy_type[type];
+	else if (fs->type == HD_MEDIA) /* High-Density media */
+		*g = &floppy_type[3];
+	else if (fs->head_number == 2) /* double-sided */
+		*g = &floppy_type[2];
+	else
+		*g = &floppy_type[1];
+
+	return 0;
+}
+
+static void setup_medium(struct floppy_state *fs)
+{
+	struct swim __iomem *base = fs->swd->base;
+
+	if (swim_readbit(base, DISK_IN)) {
+		struct floppy_struct *g;
+		fs->disk_in = 1;
+		fs->write_protected = swim_readbit(base, WRITE_PROT);
+
+		if (swim_track00(base))
+			printk(KERN_ERR
+				"SWIM: cannot move floppy head to track 0\n");
+
+		swim_track00(base);
+
+		fs->type = swim_readbit(base, TWOMEG_MEDIA) ?
+			HD_MEDIA : DD_MEDIA;
+		fs->head_number = swim_readbit(base, SINGLE_SIDED) ? 1 : 2;
+		get_floppy_geometry(fs, 0, &g);
+		fs->total_secs = g->size;
+		fs->secpercyl = g->head * g->sect;
+		fs->secpertrack = g->sect;
+		fs->track = 0;
+	} else {
+		fs->disk_in = 0;
+	}
+}
+
+static int floppy_open(struct block_device *bdev, fmode_t mode)
+{
+	struct floppy_state *fs = bdev->bd_disk->private_data;
+	struct swim __iomem *base = fs->swd->base;
+	int err;
+
+	if (fs->ref_count == -1 || (fs->ref_count && mode & FMODE_EXCL))
+		return -EBUSY;
+
+	if (mode & FMODE_EXCL)
+		fs->ref_count = -1;
+	else
+		fs->ref_count++;
+
+	swim_write(base, setup, S_IBM_DRIVE  | S_FCLK_DIV2);
+	udelay(10);
+	swim_drive(base, fs->location);
+	swim_motor(base, ON);
+	swim_action(base, SETMFM);
+	if (fs->ejected)
+		setup_medium(fs);
+	if (!fs->disk_in) {
+		err = -ENXIO;
+		goto out;
+	}
+
+	set_capacity(fs->disk, fs->total_secs);
+
+	if (mode & FMODE_NDELAY)
+		return 0;
+
+	if (mode & (FMODE_READ|FMODE_WRITE)) {
+		if (bdev_check_media_change(bdev) && fs->disk_in)
+			fs->ejected = 0;
+		if ((mode & FMODE_WRITE) && fs->write_protected) {
+			err = -EROFS;
+			goto out;
+		}
+	}
+	return 0;
+out:
+	if (fs->ref_count < 0)
+		fs->ref_count = 0;
+	else if (fs->ref_count > 0)
+		--fs->ref_count;
+
+	if (fs->ref_count == 0)
+		swim_motor(base, OFF);
+	return err;
+}
+
+static int floppy_unlocked_open(struct block_device *bdev, fmode_t mode)
+{
+	int ret;
+
+	mutex_lock(&swim_mutex);
+	ret = floppy_open(bdev, mode);
+	mutex_unlock(&swim_mutex);
+
+	return ret;
+}
+
+static void floppy_release(struct gendisk *disk, fmode_t mode)
+{
+	struct floppy_state *fs = disk->private_data;
+	struct swim __iomem *base = fs->swd->base;
+
+	mutex_lock(&swim_mutex);
+	if (fs->ref_count < 0)
+		fs->ref_count = 0;
+	else if (fs->ref_count > 0)
+		--fs->ref_count;
+
+	if (fs->ref_count == 0)
+		swim_motor(base, OFF);
+	mutex_unlock(&swim_mutex);
+}
+
+static int floppy_ioctl(struct block_device *bdev, fmode_t mode,
+			unsigned int cmd, unsigned long param)
+{
+	struct floppy_state *fs = bdev->bd_disk->private_data;
+	int err;
+
+	if ((cmd & 0x80) && !capable(CAP_SYS_ADMIN))
+			return -EPERM;
+
+	switch (cmd) {
+	case FDEJECT:
+		if (fs->ref_count != 1)
+			return -EBUSY;
+		mutex_lock(&swim_mutex);
+		err = floppy_eject(fs);
+		mutex_unlock(&swim_mutex);
+		return err;
+
+	case FDGETPRM:
+		if (copy_to_user((void __user *) param, (void *) &floppy_type,
+				 sizeof(struct floppy_struct)))
+			return -EFAULT;
+		return 0;
+	}
+	return -ENOTTY;
+}
+
+static int floppy_getgeo(struct block_device *bdev, struct hd_geometry *geo)
+{
+	struct floppy_state *fs = bdev->bd_disk->private_data;
+	struct floppy_struct *g;
+	int ret;
+
+	ret = get_floppy_geometry(fs, 0, &g);
+	if (ret)
+		return ret;
+
+	geo->heads = g->head;
+	geo->sectors = g->sect;
+	geo->cylinders = g->track;
+
+	return 0;
+}
+
+static unsigned int floppy_check_events(struct gendisk *disk,
+					unsigned int clearing)
+{
+	struct floppy_state *fs = disk->private_data;
+
+	return fs->ejected ? DISK_EVENT_MEDIA_CHANGE : 0;
+}
+
+static const struct block_device_operations floppy_fops = {
+	.owner		 = THIS_MODULE,
+	.open		 = floppy_unlocked_open,
+	.release	 = floppy_release,
+	.ioctl		 = floppy_ioctl,
+	.getgeo		 = floppy_getgeo,
+	.check_events	 = floppy_check_events,
+};
+
+static int swim_add_floppy(struct swim_priv *swd, enum drive_location location)
+{
+	struct floppy_state *fs = &swd->unit[swd->floppy_count];
+	struct swim __iomem *base = swd->base;
+
+	fs->location = location;
+
+	swim_drive(base, location);
+
+	swim_motor(base, OFF);
+
+	fs->type = HD_MEDIA;
+	fs->head_number = 2;
+
+	fs->ref_count = 0;
+	fs->ejected = 1;
+
+	swd->floppy_count++;
+
+	return 0;
+}
+
+static const struct blk_mq_ops swim_mq_ops = {
+	.queue_rq = swim_queue_rq,
+};
+
+static void swim_cleanup_floppy_disk(struct floppy_state *fs)
+{
+	struct gendisk *disk = fs->disk;
+
+	if (!disk)
+		return;
+
+	if (fs->registered)
+		del_gendisk(fs->disk);
+
+	put_disk(disk);
+	blk_mq_free_tag_set(&fs->tag_set);
+}
+
+static int swim_floppy_init(struct swim_priv *swd)
+{
+	int err;
+	int drive;
+	struct swim __iomem *base = swd->base;
+
+	/* scan floppy drives */
+
+	swim_drive(base, INTERNAL_DRIVE);
+	if (swim_readbit(base, DRIVE_PRESENT) &&
+	    !swim_readbit(base, ONEMEG_DRIVE))
+		swim_add_floppy(swd, INTERNAL_DRIVE);
+	swim_drive(base, EXTERNAL_DRIVE);
+	if (swim_readbit(base, DRIVE_PRESENT) &&
+	    !swim_readbit(base, ONEMEG_DRIVE))
+		swim_add_floppy(swd, EXTERNAL_DRIVE);
+
+	/* register floppy drives */
+
+	err = register_blkdev(FLOPPY_MAJOR, "fd");
+	if (err) {
+		printk(KERN_ERR "Unable to get major %d for SWIM floppy\n",
+		       FLOPPY_MAJOR);
+		return -EBUSY;
+	}
+
+	spin_lock_init(&swd->lock);
+
+	for (drive = 0; drive < swd->floppy_count; drive++) {
+		err = blk_mq_alloc_sq_tag_set(&swd->unit[drive].tag_set,
+				&swim_mq_ops, 2, BLK_MQ_F_SHOULD_MERGE);
+		if (err)
+			goto exit_put_disks;
+
+		swd->unit[drive].disk =
+			blk_mq_alloc_disk(&swd->unit[drive].tag_set,
+					  &swd->unit[drive]);
+		if (IS_ERR(swd->unit[drive].disk)) {
+			blk_mq_free_tag_set(&swd->unit[drive].tag_set);
+			err = PTR_ERR(swd->unit[drive].disk);
+			goto exit_put_disks;
+		}
+
+		swd->unit[drive].swd = swd;
+	}
+
+	for (drive = 0; drive < swd->floppy_count; drive++) {
+		swd->unit[drive].disk->flags = GENHD_FL_REMOVABLE;
+		swd->unit[drive].disk->major = FLOPPY_MAJOR;
+		swd->unit[drive].disk->first_minor = drive;
+		swd->unit[drive].disk->minors = 1;
+		sprintf(swd->unit[drive].disk->disk_name, "fd%d", drive);
+		swd->unit[drive].disk->fops = &floppy_fops;
+		swd->unit[drive].disk->flags |= GENHD_FL_NO_PART;
+		swd->unit[drive].disk->events = DISK_EVENT_MEDIA_CHANGE;
+		swd->unit[drive].disk->private_data = &swd->unit[drive];
+		set_capacity(swd->unit[drive].disk, 2880);
+		err = add_disk(swd->unit[drive].disk);
+		if (err)
+			goto exit_put_disks;
+		swd->unit[drive].registered = true;
+	}
+
+	return 0;
+
+exit_put_disks:
+	unregister_blkdev(FLOPPY_MAJOR, "fd");
+	do {
+		swim_cleanup_floppy_disk(&swd->unit[drive]);
+	} while (drive--);
+	return err;
+}
+
+static int swim_probe(struct platform_device *dev)
+{
+	struct resource *res;
+	struct swim __iomem *swim_base;
+	struct swim_priv *swd;
+	int ret;
+
+	res = platform_get_resource(dev, IORESOURCE_MEM, 0);
+	if (!res) {
+		ret = -ENODEV;
+		goto out;
+	}
+
+	if (!request_mem_region(res->start, resource_size(res), CARDNAME)) {
+		ret = -EBUSY;
+		goto out;
+	}
+
+	swim_base = (struct swim __iomem *)res->start;
+	if (!swim_base) {
+		ret = -ENOMEM;
+		goto out_release_io;
+	}
+
+	/* probe device */
+
+	set_swim_mode(swim_base, 1);
+	if (!get_swim_mode(swim_base)) {
+		printk(KERN_INFO "SWIM device not found !\n");
+		ret = -ENODEV;
+		goto out_release_io;
+	}
+
+	/* set platform driver data */
+
+	swd = kzalloc(sizeof(struct swim_priv), GFP_KERNEL);
+	if (!swd) {
+		ret = -ENOMEM;
+		goto out_release_io;
+	}
+	platform_set_drvdata(dev, swd);
+
+	swd->base = swim_base;
+
+	ret = swim_floppy_init(swd);
+	if (ret)
+		goto out_kfree;
+
+	return 0;
+
+out_kfree:
+	kfree(swd);
+out_release_io:
+	release_mem_region(res->start, resource_size(res));
+out:
+	return ret;
+}
+
+static int swim_remove(struct platform_device *dev)
+{
+	struct swim_priv *swd = platform_get_drvdata(dev);
+	int drive;
+	struct resource *res;
+
+	for (drive = 0; drive < swd->floppy_count; drive++)
+		swim_cleanup_floppy_disk(&swd->unit[drive]);
+
+	unregister_blkdev(FLOPPY_MAJOR, "fd");
+
+	/* eject floppies */
+
+	for (drive = 0; drive < swd->floppy_count; drive++)
+		floppy_eject(&swd->unit[drive]);
+
+	res = platform_get_resource(dev, IORESOURCE_MEM, 0);
+	if (res)
+		release_mem_region(res->start, resource_size(res));
+
+	kfree(swd);
+
+	return 0;
+}
+
+static struct platform_driver swim_driver = {
+	.probe  = swim_probe,
+	.remove = swim_remove,
+	.driver   = {
+		.name	= CARDNAME,
+	},
+};
+
+static int __init swim_init(void)
+{
+	printk(KERN_INFO "SWIM floppy driver %s\n", DRIVER_VERSION);
+
+	return platform_driver_register(&swim_driver);
+}
+module_init(swim_init);
+
+static void __exit swim_exit(void)
+{
+	platform_driver_unregister(&swim_driver);
+}
+module_exit(swim_exit);
+
+MODULE_DESCRIPTION("Driver for SWIM floppy controller");
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Laurent Vivier <laurent@lvivier.info>");
+MODULE_ALIAS_BLOCKDEV_MAJOR(FLOPPY_MAJOR);