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, 546 insertions, 0 deletions

diff --git a/drivers/spi/spi-omap-uwire.c b/drivers/spi/spi-omap-uwire.c
new file mode 100644
index 000000000..20c87163d
--- /dev/null
+++ b/drivers/spi/spi-omap-uwire.c
@@ -0,0 +1,546 @@
+/*
+ * MicroWire interface driver for OMAP
+ *
+ * Copyright 2003 MontaVista Software Inc. <source@mvista.com>
+ *
+ * Ported to 2.6 OMAP uwire interface.
+ * Copyright (C) 2004 Texas Instruments.
+ *
+ * Generalization patches by Juha Yrjola <juha.yrjola@nokia.com>
+ *
+ * Copyright (C) 2005 David Brownell (ported to 2.6 SPI interface)
+ * Copyright (C) 2006 Nokia
+ *
+ * Many updates by Imre Deak <imre.deak@nokia.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
+ * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/interrupt.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/slab.h>
+#include <linux/device.h>
+
+#include <linux/spi/spi.h>
+#include <linux/spi/spi_bitbang.h>
+#include <linux/module.h>
+#include <linux/io.h>
+
+#include <asm/mach-types.h>
+#include <linux/soc/ti/omap1-io.h>
+#include <linux/soc/ti/omap1-soc.h>
+#include <linux/soc/ti/omap1-mux.h>
+
+/* FIXME address is now a platform device resource,
+ * and irqs should show there too...
+ */
+#define UWIRE_BASE_PHYS		0xFFFB3000
+
+/* uWire Registers: */
+#define UWIRE_IO_SIZE 0x20
+#define UWIRE_TDR     0x00
+#define UWIRE_RDR     0x00
+#define UWIRE_CSR     0x01
+#define UWIRE_SR1     0x02
+#define UWIRE_SR2     0x03
+#define UWIRE_SR3     0x04
+#define UWIRE_SR4     0x05
+#define UWIRE_SR5     0x06
+
+/* CSR bits */
+#define	RDRB	(1 << 15)
+#define	CSRB	(1 << 14)
+#define	START	(1 << 13)
+#define	CS_CMD	(1 << 12)
+
+/* SR1 or SR2 bits */
+#define UWIRE_READ_FALLING_EDGE		0x0001
+#define UWIRE_READ_RISING_EDGE		0x0000
+#define UWIRE_WRITE_FALLING_EDGE	0x0000
+#define UWIRE_WRITE_RISING_EDGE		0x0002
+#define UWIRE_CS_ACTIVE_LOW		0x0000
+#define UWIRE_CS_ACTIVE_HIGH		0x0004
+#define UWIRE_FREQ_DIV_2		0x0000
+#define UWIRE_FREQ_DIV_4		0x0008
+#define UWIRE_FREQ_DIV_8		0x0010
+#define UWIRE_CHK_READY			0x0020
+#define UWIRE_CLK_INVERTED		0x0040
+
+
+struct uwire_spi {
+	struct spi_bitbang	bitbang;
+	struct clk		*ck;
+};
+
+struct uwire_state {
+	unsigned	div1_idx;
+};
+
+/* REVISIT compile time constant for idx_shift? */
+/*
+ * Or, put it in a structure which is used throughout the driver;
+ * that avoids having to issue two loads for each bit of static data.
+ */
+static unsigned int uwire_idx_shift = 2;
+static void __iomem *uwire_base;
+
+static inline void uwire_write_reg(int idx, u16 val)
+{
+	__raw_writew(val, uwire_base + (idx << uwire_idx_shift));
+}
+
+static inline u16 uwire_read_reg(int idx)
+{
+	return __raw_readw(uwire_base + (idx << uwire_idx_shift));
+}
+
+static inline void omap_uwire_configure_mode(u8 cs, unsigned long flags)
+{
+	u16	w, val = 0;
+	int	shift, reg;
+
+	if (flags & UWIRE_CLK_INVERTED)
+		val ^= 0x03;
+	val = flags & 0x3f;
+	if (cs & 1)
+		shift = 6;
+	else
+		shift = 0;
+	if (cs <= 1)
+		reg = UWIRE_SR1;
+	else
+		reg = UWIRE_SR2;
+
+	w = uwire_read_reg(reg);
+	w &= ~(0x3f << shift);
+	w |= val << shift;
+	uwire_write_reg(reg, w);
+}
+
+static int wait_uwire_csr_flag(u16 mask, u16 val, int might_not_catch)
+{
+	u16 w;
+	int c = 0;
+	unsigned long max_jiffies = jiffies + HZ;
+
+	for (;;) {
+		w = uwire_read_reg(UWIRE_CSR);
+		if ((w & mask) == val)
+			break;
+		if (time_after(jiffies, max_jiffies)) {
+			printk(KERN_ERR "%s: timeout. reg=%#06x "
+					"mask=%#06x val=%#06x\n",
+			       __func__, w, mask, val);
+			return -1;
+		}
+		c++;
+		if (might_not_catch && c > 64)
+			break;
+	}
+	return 0;
+}
+
+static void uwire_set_clk1_div(int div1_idx)
+{
+	u16 w;
+
+	w = uwire_read_reg(UWIRE_SR3);
+	w &= ~(0x03 << 1);
+	w |= div1_idx << 1;
+	uwire_write_reg(UWIRE_SR3, w);
+}
+
+static void uwire_chipselect(struct spi_device *spi, int value)
+{
+	struct	uwire_state *ust = spi->controller_state;
+	u16	w;
+	int	old_cs;
+
+
+	BUG_ON(wait_uwire_csr_flag(CSRB, 0, 0));
+
+	w = uwire_read_reg(UWIRE_CSR);
+	old_cs = (w >> 10) & 0x03;
+	if (value == BITBANG_CS_INACTIVE || old_cs != spi->chip_select) {
+		/* Deselect this CS, or the previous CS */
+		w &= ~CS_CMD;
+		uwire_write_reg(UWIRE_CSR, w);
+	}
+	/* activate specfied chipselect */
+	if (value == BITBANG_CS_ACTIVE) {
+		uwire_set_clk1_div(ust->div1_idx);
+		/* invert clock? */
+		if (spi->mode & SPI_CPOL)
+			uwire_write_reg(UWIRE_SR4, 1);
+		else
+			uwire_write_reg(UWIRE_SR4, 0);
+
+		w = spi->chip_select << 10;
+		w |= CS_CMD;
+		uwire_write_reg(UWIRE_CSR, w);
+	}
+}
+
+static int uwire_txrx(struct spi_device *spi, struct spi_transfer *t)
+{
+	unsigned	len = t->len;
+	unsigned	bits = t->bits_per_word;
+	unsigned	bytes;
+	u16		val, w;
+	int		status = 0;
+
+	if (!t->tx_buf && !t->rx_buf)
+		return 0;
+
+	w = spi->chip_select << 10;
+	w |= CS_CMD;
+
+	if (t->tx_buf) {
+		const u8	*buf = t->tx_buf;
+
+		/* NOTE:  DMA could be used for TX transfers */
+
+		/* write one or two bytes at a time */
+		while (len >= 1) {
+			/* tx bit 15 is first sent; we byteswap multibyte words
+			 * (msb-first) on the way out from memory.
+			 */
+			val = *buf++;
+			if (bits > 8) {
+				bytes = 2;
+				val |= *buf++ << 8;
+			} else
+				bytes = 1;
+			val <<= 16 - bits;
+
+#ifdef	VERBOSE
+			pr_debug("%s: write-%d =%04x\n",
+					dev_name(&spi->dev), bits, val);
+#endif
+			if (wait_uwire_csr_flag(CSRB, 0, 0))
+				goto eio;
+
+			uwire_write_reg(UWIRE_TDR, val);
+
+			/* start write */
+			val = START | w | (bits << 5);
+
+			uwire_write_reg(UWIRE_CSR, val);
+			len -= bytes;
+
+			/* Wait till write actually starts.
+			 * This is needed with MPU clock 60+ MHz.
+			 * REVISIT: we may not have time to catch it...
+			 */
+			if (wait_uwire_csr_flag(CSRB, CSRB, 1))
+				goto eio;
+
+			status += bytes;
+		}
+
+		/* REVISIT:  save this for later to get more i/o overlap */
+		if (wait_uwire_csr_flag(CSRB, 0, 0))
+			goto eio;
+
+	} else if (t->rx_buf) {
+		u8		*buf = t->rx_buf;
+
+		/* read one or two bytes at a time */
+		while (len) {
+			if (bits > 8) {
+				bytes = 2;
+			} else
+				bytes = 1;
+
+			/* start read */
+			val = START | w | (bits << 0);
+			uwire_write_reg(UWIRE_CSR, val);
+			len -= bytes;
+
+			/* Wait till read actually starts */
+			(void) wait_uwire_csr_flag(CSRB, CSRB, 1);
+
+			if (wait_uwire_csr_flag(RDRB | CSRB,
+						RDRB, 0))
+				goto eio;
+
+			/* rx bit 0 is last received; multibyte words will
+			 * be properly byteswapped on the way to memory.
+			 */
+			val = uwire_read_reg(UWIRE_RDR);
+			val &= (1 << bits) - 1;
+			*buf++ = (u8) val;
+			if (bytes == 2)
+				*buf++ = val >> 8;
+			status += bytes;
+#ifdef	VERBOSE
+			pr_debug("%s: read-%d =%04x\n",
+					dev_name(&spi->dev), bits, val);
+#endif
+
+		}
+	}
+	return status;
+eio:
+	return -EIO;
+}
+
+static int uwire_setup_transfer(struct spi_device *spi, struct spi_transfer *t)
+{
+	struct uwire_state	*ust = spi->controller_state;
+	struct uwire_spi	*uwire;
+	unsigned		flags = 0;
+	unsigned		hz;
+	unsigned long		rate;
+	int			div1_idx;
+	int			div1;
+	int			div2;
+	int			status;
+
+	uwire = spi_master_get_devdata(spi->master);
+
+	/* mode 0..3, clock inverted separately;
+	 * standard nCS signaling;
+	 * don't treat DI=high as "not ready"
+	 */
+	if (spi->mode & SPI_CS_HIGH)
+		flags |= UWIRE_CS_ACTIVE_HIGH;
+
+	if (spi->mode & SPI_CPOL)
+		flags |= UWIRE_CLK_INVERTED;
+
+	switch (spi->mode & SPI_MODE_X_MASK) {
+	case SPI_MODE_0:
+	case SPI_MODE_3:
+		flags |= UWIRE_WRITE_FALLING_EDGE | UWIRE_READ_RISING_EDGE;
+		break;
+	case SPI_MODE_1:
+	case SPI_MODE_2:
+		flags |= UWIRE_WRITE_RISING_EDGE | UWIRE_READ_FALLING_EDGE;
+		break;
+	}
+
+	/* assume it's already enabled */
+	rate = clk_get_rate(uwire->ck);
+
+	if (t != NULL)
+		hz = t->speed_hz;
+	else
+		hz = spi->max_speed_hz;
+
+	if (!hz) {
+		pr_debug("%s: zero speed?\n", dev_name(&spi->dev));
+		status = -EINVAL;
+		goto done;
+	}
+
+	/* F_INT = mpu_xor_clk / DIV1 */
+	for (div1_idx = 0; div1_idx < 4; div1_idx++) {
+		switch (div1_idx) {
+		case 0:
+			div1 = 2;
+			break;
+		case 1:
+			div1 = 4;
+			break;
+		case 2:
+			div1 = 7;
+			break;
+		default:
+		case 3:
+			div1 = 10;
+			break;
+		}
+		div2 = (rate / div1 + hz - 1) / hz;
+		if (div2 <= 8)
+			break;
+	}
+	if (div1_idx == 4) {
+		pr_debug("%s: lowest clock %ld, need %d\n",
+			dev_name(&spi->dev), rate / 10 / 8, hz);
+		status = -EDOM;
+		goto done;
+	}
+
+	/* we have to cache this and reset in uwire_chipselect as this is a
+	 * global parameter and another uwire device can change it under
+	 * us */
+	ust->div1_idx = div1_idx;
+	uwire_set_clk1_div(div1_idx);
+
+	rate /= div1;
+
+	switch (div2) {
+	case 0:
+	case 1:
+	case 2:
+		flags |= UWIRE_FREQ_DIV_2;
+		rate /= 2;
+		break;
+	case 3:
+	case 4:
+		flags |= UWIRE_FREQ_DIV_4;
+		rate /= 4;
+		break;
+	case 5:
+	case 6:
+	case 7:
+	case 8:
+		flags |= UWIRE_FREQ_DIV_8;
+		rate /= 8;
+		break;
+	}
+	omap_uwire_configure_mode(spi->chip_select, flags);
+	pr_debug("%s: uwire flags %02x, armxor %lu KHz, SCK %lu KHz\n",
+			__func__, flags,
+			clk_get_rate(uwire->ck) / 1000,
+			rate / 1000);
+	status = 0;
+done:
+	return status;
+}
+
+static int uwire_setup(struct spi_device *spi)
+{
+	struct uwire_state *ust = spi->controller_state;
+	bool initial_setup = false;
+	int status;
+
+	if (ust == NULL) {
+		ust = kzalloc(sizeof(*ust), GFP_KERNEL);
+		if (ust == NULL)
+			return -ENOMEM;
+		spi->controller_state = ust;
+		initial_setup = true;
+	}
+
+	status = uwire_setup_transfer(spi, NULL);
+	if (status && initial_setup)
+		kfree(ust);
+
+	return status;
+}
+
+static void uwire_cleanup(struct spi_device *spi)
+{
+	kfree(spi->controller_state);
+}
+
+static void uwire_off(struct uwire_spi *uwire)
+{
+	uwire_write_reg(UWIRE_SR3, 0);
+	clk_disable_unprepare(uwire->ck);
+	spi_master_put(uwire->bitbang.master);
+}
+
+static int uwire_probe(struct platform_device *pdev)
+{
+	struct spi_master	*master;
+	struct uwire_spi	*uwire;
+	int			status;
+
+	master = spi_alloc_master(&pdev->dev, sizeof(*uwire));
+	if (!master)
+		return -ENODEV;
+
+	uwire = spi_master_get_devdata(master);
+
+	uwire_base = devm_ioremap(&pdev->dev, UWIRE_BASE_PHYS, UWIRE_IO_SIZE);
+	if (!uwire_base) {
+		dev_dbg(&pdev->dev, "can't ioremap UWIRE\n");
+		spi_master_put(master);
+		return -ENOMEM;
+	}
+
+	platform_set_drvdata(pdev, uwire);
+
+	uwire->ck = devm_clk_get(&pdev->dev, "fck");
+	if (IS_ERR(uwire->ck)) {
+		status = PTR_ERR(uwire->ck);
+		dev_dbg(&pdev->dev, "no functional clock?\n");
+		spi_master_put(master);
+		return status;
+	}
+	clk_prepare_enable(uwire->ck);
+
+	uwire_write_reg(UWIRE_SR3, 1);
+
+	/* the spi->mode bits understood by this driver: */
+	master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
+	master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 16);
+	master->flags = SPI_MASTER_HALF_DUPLEX;
+
+	master->bus_num = 2;	/* "official" */
+	master->num_chipselect = 4;
+	master->setup = uwire_setup;
+	master->cleanup = uwire_cleanup;
+
+	uwire->bitbang.master = master;
+	uwire->bitbang.chipselect = uwire_chipselect;
+	uwire->bitbang.setup_transfer = uwire_setup_transfer;
+	uwire->bitbang.txrx_bufs = uwire_txrx;
+
+	status = spi_bitbang_start(&uwire->bitbang);
+	if (status < 0) {
+		uwire_off(uwire);
+	}
+	return status;
+}
+
+static int uwire_remove(struct platform_device *pdev)
+{
+	struct uwire_spi	*uwire = platform_get_drvdata(pdev);
+
+	// FIXME remove all child devices, somewhere ...
+
+	spi_bitbang_stop(&uwire->bitbang);
+	uwire_off(uwire);
+	return 0;
+}
+
+/* work with hotplug and coldplug */
+MODULE_ALIAS("platform:omap_uwire");
+
+static struct platform_driver uwire_driver = {
+	.driver = {
+		.name		= "omap_uwire",
+	},
+	.probe = uwire_probe,
+	.remove = uwire_remove,
+	// suspend ... unuse ck
+	// resume ... use ck
+};
+
+static int __init omap_uwire_init(void)
+{
+	return platform_driver_register(&uwire_driver);
+}
+
+static void __exit omap_uwire_exit(void)
+{
+	platform_driver_unregister(&uwire_driver);
+}
+
+subsys_initcall(omap_uwire_init);
+module_exit(omap_uwire_exit);
+
+MODULE_LICENSE("GPL");
+