From 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Tue, 21 Feb 2023 18:24:12 -0800 Subject: Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 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(). ... --- drivers/i2c/busses/i2c-designware-slave.c | 277 ++++++++++++++++++++++++++++++ 1 file changed, 277 insertions(+) create mode 100644 drivers/i2c/busses/i2c-designware-slave.c (limited to 'drivers/i2c/busses/i2c-designware-slave.c') diff --git a/drivers/i2c/busses/i2c-designware-slave.c b/drivers/i2c/busses/i2c-designware-slave.c new file mode 100644 index 000000000..c6d2e4c2a --- /dev/null +++ b/drivers/i2c/busses/i2c-designware-slave.c @@ -0,0 +1,277 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Synopsys DesignWare I2C adapter driver (slave only). + * + * Based on the Synopsys DesignWare I2C adapter driver (master). + * + * Copyright (C) 2016 Synopsys Inc. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "i2c-designware-core.h" + +static void i2c_dw_configure_fifo_slave(struct dw_i2c_dev *dev) +{ + /* Configure Tx/Rx FIFO threshold levels. */ + regmap_write(dev->map, DW_IC_TX_TL, 0); + regmap_write(dev->map, DW_IC_RX_TL, 0); + + /* Configure the I2C slave. */ + regmap_write(dev->map, DW_IC_CON, dev->slave_cfg); + regmap_write(dev->map, DW_IC_INTR_MASK, DW_IC_INTR_SLAVE_MASK); +} + +/** + * i2c_dw_init_slave() - Initialize the designware i2c slave hardware + * @dev: device private data + * + * This function configures and enables the I2C in slave mode. + * This function is called during I2C init function, and in case of timeout at + * run time. + */ +static int i2c_dw_init_slave(struct dw_i2c_dev *dev) +{ + int ret; + + ret = i2c_dw_acquire_lock(dev); + if (ret) + return ret; + + /* Disable the adapter. */ + __i2c_dw_disable(dev); + + /* Write SDA hold time if supported */ + if (dev->sda_hold_time) + regmap_write(dev->map, DW_IC_SDA_HOLD, dev->sda_hold_time); + + i2c_dw_configure_fifo_slave(dev); + i2c_dw_release_lock(dev); + + return 0; +} + +static int i2c_dw_reg_slave(struct i2c_client *slave) +{ + struct dw_i2c_dev *dev = i2c_get_adapdata(slave->adapter); + + if (dev->slave) + return -EBUSY; + if (slave->flags & I2C_CLIENT_TEN) + return -EAFNOSUPPORT; + pm_runtime_get_sync(dev->dev); + + /* + * Set slave address in the IC_SAR register, + * the address to which the DW_apb_i2c responds. + */ + __i2c_dw_disable_nowait(dev); + regmap_write(dev->map, DW_IC_SAR, slave->addr); + dev->slave = slave; + + __i2c_dw_enable(dev); + + dev->status = 0; + + return 0; +} + +static int i2c_dw_unreg_slave(struct i2c_client *slave) +{ + struct dw_i2c_dev *dev = i2c_get_adapdata(slave->adapter); + + regmap_write(dev->map, DW_IC_INTR_MASK, 0); + dev->disable(dev); + synchronize_irq(dev->irq); + dev->slave = NULL; + pm_runtime_put(dev->dev); + + return 0; +} + +static u32 i2c_dw_read_clear_intrbits_slave(struct dw_i2c_dev *dev) +{ + u32 stat, dummy; + + /* + * The IC_INTR_STAT register just indicates "enabled" interrupts. + * The unmasked raw version of interrupt status bits is available + * in the IC_RAW_INTR_STAT register. + * + * That is, + * stat = readl(IC_INTR_STAT); + * equals to, + * stat = readl(IC_RAW_INTR_STAT) & readl(IC_INTR_MASK); + * + * The raw version might be useful for debugging purposes. + */ + regmap_read(dev->map, DW_IC_INTR_STAT, &stat); + + /* + * Do not use the IC_CLR_INTR register to clear interrupts, or + * you'll miss some interrupts, triggered during the period from + * readl(IC_INTR_STAT) to readl(IC_CLR_INTR). + * + * Instead, use the separately-prepared IC_CLR_* registers. + */ + if (stat & DW_IC_INTR_TX_ABRT) + regmap_read(dev->map, DW_IC_CLR_TX_ABRT, &dummy); + if (stat & DW_IC_INTR_RX_UNDER) + regmap_read(dev->map, DW_IC_CLR_RX_UNDER, &dummy); + if (stat & DW_IC_INTR_RX_OVER) + regmap_read(dev->map, DW_IC_CLR_RX_OVER, &dummy); + if (stat & DW_IC_INTR_TX_OVER) + regmap_read(dev->map, DW_IC_CLR_TX_OVER, &dummy); + if (stat & DW_IC_INTR_RX_DONE) + regmap_read(dev->map, DW_IC_CLR_RX_DONE, &dummy); + if (stat & DW_IC_INTR_ACTIVITY) + regmap_read(dev->map, DW_IC_CLR_ACTIVITY, &dummy); + if (stat & DW_IC_INTR_STOP_DET) + regmap_read(dev->map, DW_IC_CLR_STOP_DET, &dummy); + if (stat & DW_IC_INTR_START_DET) + regmap_read(dev->map, DW_IC_CLR_START_DET, &dummy); + if (stat & DW_IC_INTR_GEN_CALL) + regmap_read(dev->map, DW_IC_CLR_GEN_CALL, &dummy); + + return stat; +} + +/* + * Interrupt service routine. This gets called whenever an I2C slave interrupt + * occurs. + */ +static irqreturn_t i2c_dw_isr_slave(int this_irq, void *dev_id) +{ + struct dw_i2c_dev *dev = dev_id; + u32 raw_stat, stat, enabled, tmp; + u8 val = 0, slave_activity; + + regmap_read(dev->map, DW_IC_ENABLE, &enabled); + regmap_read(dev->map, DW_IC_RAW_INTR_STAT, &raw_stat); + regmap_read(dev->map, DW_IC_STATUS, &tmp); + slave_activity = ((tmp & DW_IC_STATUS_SLAVE_ACTIVITY) >> 6); + + if (!enabled || !(raw_stat & ~DW_IC_INTR_ACTIVITY) || !dev->slave) + return IRQ_NONE; + + stat = i2c_dw_read_clear_intrbits_slave(dev); + dev_dbg(dev->dev, + "%#x STATUS SLAVE_ACTIVITY=%#x : RAW_INTR_STAT=%#x : INTR_STAT=%#x\n", + enabled, slave_activity, raw_stat, stat); + + if (stat & DW_IC_INTR_RX_FULL) { + if (!(dev->status & STATUS_WRITE_IN_PROGRESS)) { + dev->status |= STATUS_WRITE_IN_PROGRESS; + dev->status &= ~STATUS_READ_IN_PROGRESS; + i2c_slave_event(dev->slave, I2C_SLAVE_WRITE_REQUESTED, + &val); + } + + do { + regmap_read(dev->map, DW_IC_DATA_CMD, &tmp); + val = tmp; + i2c_slave_event(dev->slave, I2C_SLAVE_WRITE_RECEIVED, + &val); + regmap_read(dev->map, DW_IC_STATUS, &tmp); + } while (tmp & DW_IC_STATUS_RFNE); + } + + if (stat & DW_IC_INTR_RD_REQ) { + if (slave_activity) { + regmap_read(dev->map, DW_IC_CLR_RD_REQ, &tmp); + + if (!(dev->status & STATUS_READ_IN_PROGRESS)) { + i2c_slave_event(dev->slave, + I2C_SLAVE_READ_REQUESTED, + &val); + dev->status |= STATUS_READ_IN_PROGRESS; + dev->status &= ~STATUS_WRITE_IN_PROGRESS; + } else { + i2c_slave_event(dev->slave, + I2C_SLAVE_READ_PROCESSED, + &val); + } + regmap_write(dev->map, DW_IC_DATA_CMD, val); + } + } + + if (stat & DW_IC_INTR_STOP_DET) + i2c_slave_event(dev->slave, I2C_SLAVE_STOP, &val); + + return IRQ_HANDLED; +} + +static const struct i2c_algorithm i2c_dw_algo = { + .functionality = i2c_dw_func, + .reg_slave = i2c_dw_reg_slave, + .unreg_slave = i2c_dw_unreg_slave, +}; + +void i2c_dw_configure_slave(struct dw_i2c_dev *dev) +{ + dev->functionality = I2C_FUNC_SLAVE | DW_IC_DEFAULT_FUNCTIONALITY; + + dev->slave_cfg = DW_IC_CON_RX_FIFO_FULL_HLD_CTRL | + DW_IC_CON_RESTART_EN | DW_IC_CON_STOP_DET_IFADDRESSED; + + dev->mode = DW_IC_SLAVE; +} +EXPORT_SYMBOL_GPL(i2c_dw_configure_slave); + +int i2c_dw_probe_slave(struct dw_i2c_dev *dev) +{ + struct i2c_adapter *adap = &dev->adapter; + int ret; + + dev->init = i2c_dw_init_slave; + dev->disable = i2c_dw_disable; + + ret = i2c_dw_init_regmap(dev); + if (ret) + return ret; + + ret = i2c_dw_set_sda_hold(dev); + if (ret) + return ret; + + ret = i2c_dw_set_fifo_size(dev); + if (ret) + return ret; + + ret = dev->init(dev); + if (ret) + return ret; + + snprintf(adap->name, sizeof(adap->name), + "Synopsys DesignWare I2C Slave adapter"); + adap->retries = 3; + adap->algo = &i2c_dw_algo; + adap->dev.parent = dev->dev; + i2c_set_adapdata(adap, dev); + + ret = devm_request_irq(dev->dev, dev->irq, i2c_dw_isr_slave, + IRQF_SHARED, dev_name(dev->dev), dev); + if (ret) { + dev_err(dev->dev, "failure requesting irq %i: %d\n", + dev->irq, ret); + return ret; + } + + ret = i2c_add_numbered_adapter(adap); + if (ret) + dev_err(dev->dev, "failure adding adapter: %d\n", ret); + + return ret; +} +EXPORT_SYMBOL_GPL(i2c_dw_probe_slave); + +MODULE_AUTHOR("Luis Oliveira "); +MODULE_DESCRIPTION("Synopsys DesignWare I2C bus slave adapter"); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3