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, 753 insertions, 0 deletions

diff --git a/drivers/macintosh/mediabay.c b/drivers/macintosh/mediabay.c
new file mode 100644
index 000000000..36070c658
--- /dev/null
+++ b/drivers/macintosh/mediabay.c
@@ -0,0 +1,753 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Driver for the media bay on the PowerBook 3400 and 2400.
+ *
+ * Copyright (C) 1998 Paul Mackerras.
+ *
+ * Various evolutions by Benjamin Herrenschmidt & Henry Worth
+ */
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/delay.h>
+#include <linux/sched.h>
+#include <linux/timer.h>
+#include <linux/stddef.h>
+#include <linux/init.h>
+#include <linux/kthread.h>
+#include <linux/mutex.h>
+#include <linux/pgtable.h>
+
+#include <asm/io.h>
+#include <asm/machdep.h>
+#include <asm/pmac_feature.h>
+#include <asm/mediabay.h>
+#include <asm/sections.h>
+#include <asm/ohare.h>
+#include <asm/heathrow.h>
+#include <asm/keylargo.h>
+#include <linux/adb.h>
+#include <linux/pmu.h>
+
+#define MB_FCR32(bay, r)	((bay)->base + ((r) >> 2))
+#define MB_FCR8(bay, r)		(((volatile u8 __iomem *)((bay)->base)) + (r))
+
+#define MB_IN32(bay,r)		(in_le32(MB_FCR32(bay,r)))
+#define MB_OUT32(bay,r,v)	(out_le32(MB_FCR32(bay,r), (v)))
+#define MB_BIS(bay,r,v)		(MB_OUT32((bay), (r), MB_IN32((bay), r) | (v)))
+#define MB_BIC(bay,r,v)		(MB_OUT32((bay), (r), MB_IN32((bay), r) & ~(v)))
+#define MB_IN8(bay,r)		(in_8(MB_FCR8(bay,r)))
+#define MB_OUT8(bay,r,v)	(out_8(MB_FCR8(bay,r), (v)))
+
+struct media_bay_info;
+
+struct mb_ops {
+	char*	name;
+	void	(*init)(struct media_bay_info *bay);
+	u8	(*content)(struct media_bay_info *bay);
+	void	(*power)(struct media_bay_info *bay, int on_off);
+	int	(*setup_bus)(struct media_bay_info *bay, u8 device_id);
+	void	(*un_reset)(struct media_bay_info *bay);
+	void	(*un_reset_ide)(struct media_bay_info *bay);
+};
+
+struct media_bay_info {
+	u32 __iomem			*base;
+	int				content_id;
+	int				state;
+	int				last_value;
+	int				value_count;
+	int				timer;
+	struct macio_dev		*mdev;
+	const struct mb_ops*		ops;
+	int				index;
+	int				cached_gpio;
+	int				sleeping;
+	int				user_lock;
+	struct mutex			lock;
+};
+
+#define MAX_BAYS	2
+
+static struct media_bay_info media_bays[MAX_BAYS];
+static int media_bay_count = 0;
+
+/*
+ * Wait that number of ms between each step in normal polling mode
+ */
+#define MB_POLL_DELAY	25
+
+/*
+ * Consider the media-bay ID value stable if it is the same for
+ * this number of milliseconds
+ */
+#define MB_STABLE_DELAY	100
+
+/* Wait after powering up the media bay this delay in ms
+ * timeout bumped for some powerbooks
+ */
+#define MB_POWER_DELAY	200
+
+/*
+ * Hold the media-bay reset signal true for this many ticks
+ * after a device is inserted before releasing it.
+ */
+#define MB_RESET_DELAY	50
+
+/*
+ * Wait this long after the reset signal is released and before doing
+ * further operations. After this delay, the IDE reset signal is released
+ * too for an IDE device
+ */
+#define MB_SETUP_DELAY	100
+
+/*
+ * Wait this many ticks after an IDE device (e.g. CD-ROM) is inserted
+ * (or until the device is ready) before calling into the driver
+ */
+#define MB_IDE_WAIT	1000
+
+/*
+ * States of a media bay
+ */
+enum {
+	mb_empty = 0,		/* Idle */
+	mb_powering_up,		/* power bit set, waiting MB_POWER_DELAY */
+	mb_enabling_bay,	/* enable bits set, waiting MB_RESET_DELAY */
+	mb_resetting,		/* reset bit unset, waiting MB_SETUP_DELAY */
+	mb_ide_resetting,	/* IDE reset bit unser, waiting MB_IDE_WAIT */
+	mb_up,			/* Media bay full */
+	mb_powering_down	/* Powering down (avoid too fast down/up) */
+};
+
+#define MB_POWER_SOUND		0x08
+#define MB_POWER_FLOPPY		0x04
+#define MB_POWER_ATA		0x02
+#define MB_POWER_PCI		0x01
+#define MB_POWER_OFF		0x00
+
+/*
+ * Functions for polling content of media bay
+ */
+ 
+static u8
+ohare_mb_content(struct media_bay_info *bay)
+{
+	return (MB_IN32(bay, OHARE_MBCR) >> 12) & 7;
+}
+
+static u8
+heathrow_mb_content(struct media_bay_info *bay)
+{
+	return (MB_IN32(bay, HEATHROW_MBCR) >> 12) & 7;
+}
+
+static u8
+keylargo_mb_content(struct media_bay_info *bay)
+{
+	int new_gpio;
+
+	new_gpio = MB_IN8(bay, KL_GPIO_MEDIABAY_IRQ) & KEYLARGO_GPIO_INPUT_DATA;
+	if (new_gpio) {
+		bay->cached_gpio = new_gpio;
+		return MB_NO;
+	} else if (bay->cached_gpio != new_gpio) {
+		MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_ENABLE);
+		(void)MB_IN32(bay, KEYLARGO_MBCR);
+		udelay(5);
+		MB_BIC(bay, KEYLARGO_MBCR, 0x0000000F);
+		(void)MB_IN32(bay, KEYLARGO_MBCR);
+		udelay(5);
+		bay->cached_gpio = new_gpio;
+	}
+	return (MB_IN32(bay, KEYLARGO_MBCR) >> 4) & 7;
+}
+
+/*
+ * Functions for powering up/down the bay, puts the bay device
+ * into reset state as well
+ */
+
+static void
+ohare_mb_power(struct media_bay_info* bay, int on_off)
+{
+	if (on_off) {
+		/* Power up device, assert it's reset line */
+		MB_BIC(bay, OHARE_FCR, OH_BAY_RESET_N);
+		MB_BIC(bay, OHARE_FCR, OH_BAY_POWER_N);
+	} else {
+		/* Disable all devices */
+		MB_BIC(bay, OHARE_FCR, OH_BAY_DEV_MASK);
+		MB_BIC(bay, OHARE_FCR, OH_FLOPPY_ENABLE);
+		/* Cut power from bay, release reset line */
+		MB_BIS(bay, OHARE_FCR, OH_BAY_POWER_N);
+		MB_BIS(bay, OHARE_FCR, OH_BAY_RESET_N);
+		MB_BIS(bay, OHARE_FCR, OH_IDE1_RESET_N);
+	}
+	MB_BIC(bay, OHARE_MBCR, 0x00000F00);
+}
+
+static void
+heathrow_mb_power(struct media_bay_info* bay, int on_off)
+{
+	if (on_off) {
+		/* Power up device, assert it's reset line */
+		MB_BIC(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
+		MB_BIC(bay, HEATHROW_FCR, HRW_BAY_POWER_N);
+	} else {
+		/* Disable all devices */
+		MB_BIC(bay, HEATHROW_FCR, HRW_BAY_DEV_MASK);
+		MB_BIC(bay, HEATHROW_FCR, HRW_SWIM_ENABLE);
+		/* Cut power from bay, release reset line */
+		MB_BIS(bay, HEATHROW_FCR, HRW_BAY_POWER_N);
+		MB_BIS(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
+		MB_BIS(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
+	}
+	MB_BIC(bay, HEATHROW_MBCR, 0x00000F00);
+}
+
+static void
+keylargo_mb_power(struct media_bay_info* bay, int on_off)
+{
+	if (on_off) {
+		/* Power up device, assert it's reset line */
+            	MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
+            	MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_POWER);
+	} else {
+		/* Disable all devices */
+		MB_BIC(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_MASK);
+		MB_BIC(bay, KEYLARGO_FCR1, KL1_EIDE0_ENABLE);
+		/* Cut power from bay, release reset line */
+		MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_POWER);
+		MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
+		MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
+	}
+	MB_BIC(bay, KEYLARGO_MBCR, 0x0000000F);
+}
+
+/*
+ * Functions for configuring the media bay for a given type of device,
+ * enable the related busses
+ */
+
+static int
+ohare_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
+{
+	switch(device_id) {
+		case MB_FD:
+		case MB_FD1:
+			MB_BIS(bay, OHARE_FCR, OH_BAY_FLOPPY_ENABLE);
+			MB_BIS(bay, OHARE_FCR, OH_FLOPPY_ENABLE);
+			return 0;
+		case MB_CD:
+			MB_BIC(bay, OHARE_FCR, OH_IDE1_RESET_N);
+			MB_BIS(bay, OHARE_FCR, OH_BAY_IDE_ENABLE);
+			return 0;
+		case MB_PCI:
+			MB_BIS(bay, OHARE_FCR, OH_BAY_PCI_ENABLE);
+			return 0;
+	}
+	return -ENODEV;
+}
+
+static int
+heathrow_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
+{
+	switch(device_id) {
+		case MB_FD:
+		case MB_FD1:
+			MB_BIS(bay, HEATHROW_FCR, HRW_BAY_FLOPPY_ENABLE);
+			MB_BIS(bay, HEATHROW_FCR, HRW_SWIM_ENABLE);
+			return 0;
+		case MB_CD:
+			MB_BIC(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
+			MB_BIS(bay, HEATHROW_FCR, HRW_BAY_IDE_ENABLE);
+			return 0;
+		case MB_PCI:
+			MB_BIS(bay, HEATHROW_FCR, HRW_BAY_PCI_ENABLE);
+			return 0;
+	}
+	return -ENODEV;
+}
+
+static int
+keylargo_mb_setup_bus(struct media_bay_info* bay, u8 device_id)
+{
+	switch(device_id) {
+		case MB_CD:
+			MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_IDE_ENABLE);
+			MB_BIC(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
+			MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_ENABLE);
+			return 0;
+		case MB_PCI:
+			MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_PCI_ENABLE);
+			return 0;
+		case MB_SOUND:
+			MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_SOUND_ENABLE);
+			return 0;
+	}
+	return -ENODEV;
+}
+
+/*
+ * Functions for tweaking resets
+ */
+
+static void
+ohare_mb_un_reset(struct media_bay_info* bay)
+{
+	MB_BIS(bay, OHARE_FCR, OH_BAY_RESET_N);
+}
+
+static void keylargo_mb_init(struct media_bay_info *bay)
+{
+	MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_ENABLE);
+}
+
+static void heathrow_mb_un_reset(struct media_bay_info* bay)
+{
+	MB_BIS(bay, HEATHROW_FCR, HRW_BAY_RESET_N);
+}
+
+static void keylargo_mb_un_reset(struct media_bay_info* bay)
+{
+	MB_BIS(bay, KEYLARGO_MBCR, KL_MBCR_MB0_DEV_RESET);
+}
+
+static void ohare_mb_un_reset_ide(struct media_bay_info* bay)
+{
+	MB_BIS(bay, OHARE_FCR, OH_IDE1_RESET_N);
+}
+
+static void heathrow_mb_un_reset_ide(struct media_bay_info* bay)
+{
+	MB_BIS(bay, HEATHROW_FCR, HRW_IDE1_RESET_N);
+}
+
+static void keylargo_mb_un_reset_ide(struct media_bay_info* bay)
+{
+	MB_BIS(bay, KEYLARGO_FCR1, KL1_EIDE0_RESET_N);
+}
+
+static inline void set_mb_power(struct media_bay_info* bay, int onoff)
+{
+	/* Power up up and assert the bay reset line */
+	if (onoff) {
+		bay->ops->power(bay, 1);
+		bay->state = mb_powering_up;
+		pr_debug("mediabay%d: powering up\n", bay->index);
+	} else { 
+		/* Make sure everything is powered down & disabled */
+		bay->ops->power(bay, 0);
+		bay->state = mb_powering_down;
+		pr_debug("mediabay%d: powering down\n", bay->index);
+	}
+	bay->timer = msecs_to_jiffies(MB_POWER_DELAY);
+}
+
+static void poll_media_bay(struct media_bay_info* bay)
+{
+	int id = bay->ops->content(bay);
+
+	static char *mb_content_types[] = {
+		"a floppy drive",
+		"a floppy drive",
+		"an unsupported audio device",
+		"an ATA device",
+		"an unsupported PCI device",
+		"an unknown device",
+	};
+
+	if (id != bay->last_value) {
+		bay->last_value = id;
+		bay->value_count = 0;
+		return;
+	}
+	if (id == bay->content_id)
+		return;
+
+	bay->value_count += msecs_to_jiffies(MB_POLL_DELAY);
+	if (bay->value_count >= msecs_to_jiffies(MB_STABLE_DELAY)) {
+		/* If the device type changes without going thru
+		 * "MB_NO", we force a pass by "MB_NO" to make sure
+		 * things are properly reset
+		 */
+		if ((id != MB_NO) && (bay->content_id != MB_NO)) {
+			id = MB_NO;
+			pr_debug("mediabay%d: forcing MB_NO\n", bay->index);
+		}
+		pr_debug("mediabay%d: switching to %d\n", bay->index, id);
+		set_mb_power(bay, id != MB_NO);
+		bay->content_id = id;
+		if (id >= MB_NO || id < 0)
+			printk(KERN_INFO "mediabay%d: Bay is now empty\n", bay->index);
+		else
+			printk(KERN_INFO "mediabay%d: Bay contains %s\n",
+			       bay->index, mb_content_types[id]);
+	}
+}
+
+int check_media_bay(struct macio_dev *baydev)
+{
+	struct media_bay_info* bay;
+	int id;
+
+	if (baydev == NULL)
+		return MB_NO;
+
+	/* This returns an instant snapshot, not locking, sine
+	 * we may be called with the bay lock held. The resulting
+	 * fuzzyness of the result if called at the wrong time is
+	 * not actually a huge deal
+	 */
+	bay = macio_get_drvdata(baydev);
+	if (bay == NULL)
+		return MB_NO;
+	id = bay->content_id;
+	if (bay->state != mb_up)
+		return MB_NO;
+	if (id == MB_FD1)
+		return MB_FD;
+	return id;
+}
+EXPORT_SYMBOL_GPL(check_media_bay);
+
+void lock_media_bay(struct macio_dev *baydev)
+{
+	struct media_bay_info* bay;
+
+	if (baydev == NULL)
+		return;
+	bay = macio_get_drvdata(baydev);
+	if (bay == NULL)
+		return;
+	mutex_lock(&bay->lock);
+	bay->user_lock = 1;
+}
+EXPORT_SYMBOL_GPL(lock_media_bay);
+
+void unlock_media_bay(struct macio_dev *baydev)
+{
+	struct media_bay_info* bay;
+
+	if (baydev == NULL)
+		return;
+	bay = macio_get_drvdata(baydev);
+	if (bay == NULL)
+		return;
+	if (bay->user_lock) {
+		bay->user_lock = 0;
+		mutex_unlock(&bay->lock);
+	}
+}
+EXPORT_SYMBOL_GPL(unlock_media_bay);
+
+static int mb_broadcast_hotplug(struct device *dev, void *data)
+{
+	struct media_bay_info* bay = data;
+	struct macio_dev *mdev;
+	struct macio_driver *drv;
+	int state;
+
+	if (dev->bus != &macio_bus_type)
+		return 0;
+
+	state = bay->state == mb_up ? bay->content_id : MB_NO;
+	if (state == MB_FD1)
+		state = MB_FD;
+	mdev = to_macio_device(dev);
+	drv = to_macio_driver(dev->driver);
+	if (dev->driver && drv->mediabay_event)
+		drv->mediabay_event(mdev, state);
+	return 0;
+}
+
+static void media_bay_step(int i)
+{
+	struct media_bay_info* bay = &media_bays[i];
+
+	/* We don't poll when powering down */
+	if (bay->state != mb_powering_down)
+	    poll_media_bay(bay);
+
+	/* If timer expired run state machine */
+	if (bay->timer != 0) {
+		bay->timer -= msecs_to_jiffies(MB_POLL_DELAY);
+		if (bay->timer > 0)
+			return;
+		bay->timer = 0;
+	}
+
+	switch(bay->state) {
+	case mb_powering_up:
+	    	if (bay->ops->setup_bus(bay, bay->last_value) < 0) {
+			pr_debug("mediabay%d: device not supported (kind:%d)\n",
+				 i, bay->content_id);
+	    		set_mb_power(bay, 0);
+	    		break;
+	    	}
+	    	bay->timer = msecs_to_jiffies(MB_RESET_DELAY);
+	    	bay->state = mb_enabling_bay;
+		pr_debug("mediabay%d: enabling (kind:%d)\n", i, bay->content_id);
+		break;
+	case mb_enabling_bay:
+		bay->ops->un_reset(bay);
+	    	bay->timer = msecs_to_jiffies(MB_SETUP_DELAY);
+	    	bay->state = mb_resetting;
+		pr_debug("mediabay%d: releasing bay reset (kind:%d)\n",
+			 i, bay->content_id);
+	    	break;
+	case mb_resetting:
+		if (bay->content_id != MB_CD) {
+			pr_debug("mediabay%d: bay is up (kind:%d)\n", i,
+				 bay->content_id);
+			bay->state = mb_up;
+			device_for_each_child(&bay->mdev->ofdev.dev,
+					      bay, mb_broadcast_hotplug);
+			break;
+	    	}
+		pr_debug("mediabay%d: releasing ATA reset (kind:%d)\n",
+			 i, bay->content_id);
+		bay->ops->un_reset_ide(bay);
+	    	bay->timer = msecs_to_jiffies(MB_IDE_WAIT);
+	    	bay->state = mb_ide_resetting;
+	    	break;
+
+	case mb_ide_resetting:
+		pr_debug("mediabay%d: bay is up (kind:%d)\n", i, bay->content_id);
+		bay->state = mb_up;
+		device_for_each_child(&bay->mdev->ofdev.dev,
+				      bay, mb_broadcast_hotplug);
+	    	break;
+
+	case mb_powering_down:
+	    	bay->state = mb_empty;
+		device_for_each_child(&bay->mdev->ofdev.dev,
+				      bay, mb_broadcast_hotplug);
+		pr_debug("mediabay%d: end of power down\n", i);
+	    	break;
+	}
+}
+
+/*
+ * This procedure runs as a kernel thread to poll the media bay
+ * once each tick and register and unregister the IDE interface
+ * with the IDE driver.  It needs to be a thread because
+ * ide_register can't be called from interrupt context.
+ */
+static int media_bay_task(void *x)
+{
+	int	i;
+
+	while (!kthread_should_stop()) {
+		for (i = 0; i < media_bay_count; ++i) {
+			mutex_lock(&media_bays[i].lock);
+			if (!media_bays[i].sleeping)
+				media_bay_step(i);
+			mutex_unlock(&media_bays[i].lock);
+		}
+
+		msleep_interruptible(MB_POLL_DELAY);
+	}
+	return 0;
+}
+
+static int media_bay_attach(struct macio_dev *mdev,
+			    const struct of_device_id *match)
+{
+	struct media_bay_info* bay;
+	u32 __iomem *regbase;
+	struct device_node *ofnode;
+	unsigned long base;
+	int i;
+
+	ofnode = mdev->ofdev.dev.of_node;
+
+	if (macio_resource_count(mdev) < 1)
+		return -ENODEV;
+	if (macio_request_resources(mdev, "media-bay"))
+		return -EBUSY;
+	/* Media bay registers are located at the beginning of the
+         * mac-io chip, for now, we trick and align down the first
+	 * resource passed in
+         */
+	base = macio_resource_start(mdev, 0) & 0xffff0000u;
+	regbase = (u32 __iomem *)ioremap(base, 0x100);
+	if (regbase == NULL) {
+		macio_release_resources(mdev);
+		return -ENOMEM;
+	}
+	
+	i = media_bay_count++;
+	bay = &media_bays[i];
+	bay->mdev = mdev;
+	bay->base = regbase;
+	bay->index = i;
+	bay->ops = match->data;
+	bay->sleeping = 0;
+	mutex_init(&bay->lock);
+
+	/* Init HW probing */
+	if (bay->ops->init)
+		bay->ops->init(bay);
+
+	printk(KERN_INFO "mediabay%d: Registered %s media-bay\n", i, bay->ops->name);
+
+	/* Force an immediate detect */
+	set_mb_power(bay, 0);
+	msleep(MB_POWER_DELAY);
+	bay->content_id = MB_NO;
+	bay->last_value = bay->ops->content(bay);
+	bay->value_count = msecs_to_jiffies(MB_STABLE_DELAY);
+	bay->state = mb_empty;
+
+	/* Mark us ready by filling our mdev data */
+	macio_set_drvdata(mdev, bay);
+
+	/* Startup kernel thread */
+	if (i == 0)
+		kthread_run(media_bay_task, NULL, "media-bay");
+
+	return 0;
+
+}
+
+static int media_bay_suspend(struct macio_dev *mdev, pm_message_t state)
+{
+	struct media_bay_info	*bay = macio_get_drvdata(mdev);
+
+	if (state.event != mdev->ofdev.dev.power.power_state.event
+	    && (state.event & PM_EVENT_SLEEP)) {
+		mutex_lock(&bay->lock);
+		bay->sleeping = 1;
+		set_mb_power(bay, 0);
+		mutex_unlock(&bay->lock);
+		msleep(MB_POLL_DELAY);
+		mdev->ofdev.dev.power.power_state = state;
+	}
+	return 0;
+}
+
+static int media_bay_resume(struct macio_dev *mdev)
+{
+	struct media_bay_info	*bay = macio_get_drvdata(mdev);
+
+	if (mdev->ofdev.dev.power.power_state.event != PM_EVENT_ON) {
+		mdev->ofdev.dev.power.power_state = PMSG_ON;
+
+	       	/* We re-enable the bay using it's previous content
+	       	   only if it did not change. Note those bozo timings,
+	       	   they seem to help the 3400 get it right.
+	       	 */
+	       	/* Force MB power to 0 */
+		mutex_lock(&bay->lock);
+	       	set_mb_power(bay, 0);
+		msleep(MB_POWER_DELAY);
+	       	if (bay->ops->content(bay) != bay->content_id) {
+			printk("mediabay%d: Content changed during sleep...\n", bay->index);
+			mutex_unlock(&bay->lock);
+	       		return 0;
+		}
+	       	set_mb_power(bay, 1);
+	       	bay->last_value = bay->content_id;
+	       	bay->value_count = msecs_to_jiffies(MB_STABLE_DELAY);
+	       	bay->timer = msecs_to_jiffies(MB_POWER_DELAY);
+	       	do {
+			msleep(MB_POLL_DELAY);
+	       		media_bay_step(bay->index);
+	       	} while((bay->state != mb_empty) &&
+	       		(bay->state != mb_up));
+		bay->sleeping = 0;
+		mutex_unlock(&bay->lock);
+	}
+	return 0;
+}
+
+
+/* Definitions of "ops" structures.
+ */
+static const struct mb_ops ohare_mb_ops = {
+	.name		= "Ohare",
+	.content	= ohare_mb_content,
+	.power		= ohare_mb_power,
+	.setup_bus	= ohare_mb_setup_bus,
+	.un_reset	= ohare_mb_un_reset,
+	.un_reset_ide	= ohare_mb_un_reset_ide,
+};
+
+static const struct mb_ops heathrow_mb_ops = {
+	.name		= "Heathrow",
+	.content	= heathrow_mb_content,
+	.power		= heathrow_mb_power,
+	.setup_bus	= heathrow_mb_setup_bus,
+	.un_reset	= heathrow_mb_un_reset,
+	.un_reset_ide	= heathrow_mb_un_reset_ide,
+};
+
+static const struct mb_ops keylargo_mb_ops = {
+	.name		= "KeyLargo",
+	.init		= keylargo_mb_init,
+	.content	= keylargo_mb_content,
+	.power		= keylargo_mb_power,
+	.setup_bus	= keylargo_mb_setup_bus,
+	.un_reset	= keylargo_mb_un_reset,
+	.un_reset_ide	= keylargo_mb_un_reset_ide,
+};
+
+/*
+ * It seems that the bit for the media-bay interrupt in the IRQ_LEVEL
+ * register is always set when there is something in the media bay.
+ * This causes problems for the interrupt code if we attach an interrupt
+ * handler to the media-bay interrupt, because it tends to go into
+ * an infinite loop calling the media bay interrupt handler.
+ * Therefore we do it all by polling the media bay once each tick.
+ */
+
+static const struct of_device_id media_bay_match[] =
+{
+	{
+	.name		= "media-bay",
+	.compatible	= "keylargo-media-bay",
+	.data		= &keylargo_mb_ops,
+	},
+	{
+	.name		= "media-bay",
+	.compatible	= "heathrow-media-bay",
+	.data		= &heathrow_mb_ops,
+	},
+	{
+	.name		= "media-bay",
+	.compatible	= "ohare-media-bay",
+	.data		= &ohare_mb_ops,
+	},
+	{},
+};
+
+static struct macio_driver media_bay_driver =
+{
+	.driver = {
+		.name		= "media-bay",
+		.of_match_table	= media_bay_match,
+	},
+	.probe		= media_bay_attach,
+	.suspend	= media_bay_suspend,
+	.resume		= media_bay_resume
+};
+
+static int __init media_bay_init(void)
+{
+	int i;
+
+	for (i=0; i<MAX_BAYS; i++) {
+		memset((char *)&media_bays[i], 0, sizeof(struct media_bay_info));
+		media_bays[i].content_id	= -1;
+	}
+	if (!machine_is(powermac))
+		return 0;
+
+	macio_register_driver(&media_bay_driver);	
+
+	return 0;
+}
+
+device_initcall(media_bay_init);