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-isch.c | 312 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 312 insertions(+) create mode 100644 drivers/i2c/busses/i2c-isch.c (limited to 'drivers/i2c/busses/i2c-isch.c') diff --git a/drivers/i2c/busses/i2c-isch.c b/drivers/i2c/busses/i2c-isch.c new file mode 100644 index 000000000..2dc7ada06 --- /dev/null +++ b/drivers/i2c/busses/i2c-isch.c @@ -0,0 +1,312 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + i2c-isch.c - Linux kernel driver for Intel SCH chipset SMBus + - Based on i2c-piix4.c + Copyright (c) 1998 - 2002 Frodo Looijaard and + Philip Edelbrock + - Intel SCH support + Copyright (c) 2007 - 2008 Jacob Jun Pan + +*/ + +/* + Supports: + Intel SCH chipsets (AF82US15W, AF82US15L, AF82UL11L) + Note: we assume there can only be one device, with one SMBus interface. +*/ + +#include +#include +#include +#include +#include +#include +#include +#include + +/* SCH SMBus address offsets */ +#define SMBHSTCNT (0 + sch_smba) +#define SMBHSTSTS (1 + sch_smba) +#define SMBHSTCLK (2 + sch_smba) +#define SMBHSTADD (4 + sch_smba) /* TSA */ +#define SMBHSTCMD (5 + sch_smba) +#define SMBHSTDAT0 (6 + sch_smba) +#define SMBHSTDAT1 (7 + sch_smba) +#define SMBBLKDAT (0x20 + sch_smba) + +/* Other settings */ +#define MAX_RETRIES 5000 + +/* I2C constants */ +#define SCH_QUICK 0x00 +#define SCH_BYTE 0x01 +#define SCH_BYTE_DATA 0x02 +#define SCH_WORD_DATA 0x03 +#define SCH_BLOCK_DATA 0x05 + +static unsigned short sch_smba; +static struct i2c_adapter sch_adapter; +static int backbone_speed = 33000; /* backbone speed in kHz */ +module_param(backbone_speed, int, S_IRUSR | S_IWUSR); +MODULE_PARM_DESC(backbone_speed, "Backbone speed in kHz, (default = 33000)"); + +/* + * Start the i2c transaction -- the i2c_access will prepare the transaction + * and this function will execute it. + * return 0 for success and others for failure. + */ +static int sch_transaction(void) +{ + int temp; + int result = 0; + int retries = 0; + + dev_dbg(&sch_adapter.dev, "Transaction (pre): CNT=%02x, CMD=%02x, " + "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb(SMBHSTCNT), + inb(SMBHSTCMD), inb(SMBHSTADD), inb(SMBHSTDAT0), + inb(SMBHSTDAT1)); + + /* Make sure the SMBus host is ready to start transmitting */ + temp = inb(SMBHSTSTS) & 0x0f; + if (temp) { + /* Can not be busy since we checked it in sch_access */ + if (temp & 0x01) { + dev_dbg(&sch_adapter.dev, "Completion (%02x). " + "Clear...\n", temp); + } + if (temp & 0x06) { + dev_dbg(&sch_adapter.dev, "SMBus error (%02x). " + "Resetting...\n", temp); + } + outb(temp, SMBHSTSTS); + temp = inb(SMBHSTSTS) & 0x0f; + if (temp) { + dev_err(&sch_adapter.dev, + "SMBus is not ready: (%02x)\n", temp); + return -EAGAIN; + } + } + + /* start the transaction by setting bit 4 */ + outb(inb(SMBHSTCNT) | 0x10, SMBHSTCNT); + + do { + usleep_range(100, 200); + temp = inb(SMBHSTSTS) & 0x0f; + } while ((temp & 0x08) && (retries++ < MAX_RETRIES)); + + /* If the SMBus is still busy, we give up */ + if (retries > MAX_RETRIES) { + dev_err(&sch_adapter.dev, "SMBus Timeout!\n"); + result = -ETIMEDOUT; + } + if (temp & 0x04) { + result = -EIO; + dev_dbg(&sch_adapter.dev, "Bus collision! SMBus may be " + "locked until next hard reset. (sorry!)\n"); + /* Clock stops and slave is stuck in mid-transmission */ + } else if (temp & 0x02) { + result = -EIO; + dev_err(&sch_adapter.dev, "Error: no response!\n"); + } else if (temp & 0x01) { + dev_dbg(&sch_adapter.dev, "Post complete!\n"); + outb(temp, SMBHSTSTS); + temp = inb(SMBHSTSTS) & 0x07; + if (temp & 0x06) { + /* Completion clear failed */ + dev_dbg(&sch_adapter.dev, "Failed reset at end of " + "transaction (%02x), Bus error!\n", temp); + } + } else { + result = -ENXIO; + dev_dbg(&sch_adapter.dev, "No such address.\n"); + } + dev_dbg(&sch_adapter.dev, "Transaction (post): CNT=%02x, CMD=%02x, " + "ADD=%02x, DAT0=%02x, DAT1=%02x\n", inb(SMBHSTCNT), + inb(SMBHSTCMD), inb(SMBHSTADD), inb(SMBHSTDAT0), + inb(SMBHSTDAT1)); + return result; +} + +/* + * This is the main access entry for i2c-sch access + * adap is i2c_adapter pointer, addr is the i2c device bus address, read_write + * (0 for read and 1 for write), size is i2c transaction type and data is the + * union of transaction for data to be transferred or data read from bus. + * return 0 for success and others for failure. + */ +static s32 sch_access(struct i2c_adapter *adap, u16 addr, + unsigned short flags, char read_write, + u8 command, int size, union i2c_smbus_data *data) +{ + int i, len, temp, rc; + + /* Make sure the SMBus host is not busy */ + temp = inb(SMBHSTSTS) & 0x0f; + if (temp & 0x08) { + dev_dbg(&sch_adapter.dev, "SMBus busy (%02x)\n", temp); + return -EAGAIN; + } + temp = inw(SMBHSTCLK); + if (!temp) { + /* + * We can't determine if we have 33 or 25 MHz clock for + * SMBus, so expect 33 MHz and calculate a bus clock of + * 100 kHz. If we actually run at 25 MHz the bus will be + * run ~75 kHz instead which should do no harm. + */ + dev_notice(&sch_adapter.dev, + "Clock divider uninitialized. Setting defaults\n"); + outw(backbone_speed / (4 * 100), SMBHSTCLK); + } + + dev_dbg(&sch_adapter.dev, "access size: %d %s\n", size, + (read_write)?"READ":"WRITE"); + switch (size) { + case I2C_SMBUS_QUICK: + outb((addr << 1) | read_write, SMBHSTADD); + size = SCH_QUICK; + break; + case I2C_SMBUS_BYTE: + outb((addr << 1) | read_write, SMBHSTADD); + if (read_write == I2C_SMBUS_WRITE) + outb(command, SMBHSTCMD); + size = SCH_BYTE; + break; + case I2C_SMBUS_BYTE_DATA: + outb((addr << 1) | read_write, SMBHSTADD); + outb(command, SMBHSTCMD); + if (read_write == I2C_SMBUS_WRITE) + outb(data->byte, SMBHSTDAT0); + size = SCH_BYTE_DATA; + break; + case I2C_SMBUS_WORD_DATA: + outb((addr << 1) | read_write, SMBHSTADD); + outb(command, SMBHSTCMD); + if (read_write == I2C_SMBUS_WRITE) { + outb(data->word & 0xff, SMBHSTDAT0); + outb((data->word & 0xff00) >> 8, SMBHSTDAT1); + } + size = SCH_WORD_DATA; + break; + case I2C_SMBUS_BLOCK_DATA: + outb((addr << 1) | read_write, SMBHSTADD); + outb(command, SMBHSTCMD); + if (read_write == I2C_SMBUS_WRITE) { + len = data->block[0]; + if (len == 0 || len > I2C_SMBUS_BLOCK_MAX) + return -EINVAL; + outb(len, SMBHSTDAT0); + for (i = 1; i <= len; i++) + outb(data->block[i], SMBBLKDAT+i-1); + } + size = SCH_BLOCK_DATA; + break; + default: + dev_warn(&adap->dev, "Unsupported transaction %d\n", size); + return -EOPNOTSUPP; + } + dev_dbg(&sch_adapter.dev, "write size %d to 0x%04x\n", size, SMBHSTCNT); + outb((inb(SMBHSTCNT) & 0xb0) | (size & 0x7), SMBHSTCNT); + + rc = sch_transaction(); + if (rc) /* Error in transaction */ + return rc; + + if ((read_write == I2C_SMBUS_WRITE) || (size == SCH_QUICK)) + return 0; + + switch (size) { + case SCH_BYTE: + case SCH_BYTE_DATA: + data->byte = inb(SMBHSTDAT0); + break; + case SCH_WORD_DATA: + data->word = inb(SMBHSTDAT0) + (inb(SMBHSTDAT1) << 8); + break; + case SCH_BLOCK_DATA: + data->block[0] = inb(SMBHSTDAT0); + if (data->block[0] == 0 || data->block[0] > I2C_SMBUS_BLOCK_MAX) + return -EPROTO; + for (i = 1; i <= data->block[0]; i++) + data->block[i] = inb(SMBBLKDAT+i-1); + break; + } + return 0; +} + +static u32 sch_func(struct i2c_adapter *adapter) +{ + return I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE | + I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA | + I2C_FUNC_SMBUS_BLOCK_DATA; +} + +static const struct i2c_algorithm smbus_algorithm = { + .smbus_xfer = sch_access, + .functionality = sch_func, +}; + +static struct i2c_adapter sch_adapter = { + .owner = THIS_MODULE, + .class = I2C_CLASS_HWMON | I2C_CLASS_SPD, + .algo = &smbus_algorithm, +}; + +static int smbus_sch_probe(struct platform_device *dev) +{ + struct resource *res; + int retval; + + res = platform_get_resource(dev, IORESOURCE_IO, 0); + if (!res) + return -EBUSY; + + if (!devm_request_region(&dev->dev, res->start, resource_size(res), + dev->name)) { + dev_err(&dev->dev, "SMBus region 0x%x already in use!\n", + sch_smba); + return -EBUSY; + } + + sch_smba = res->start; + + dev_dbg(&dev->dev, "SMBA = 0x%X\n", sch_smba); + + /* set up the sysfs linkage to our parent device */ + sch_adapter.dev.parent = &dev->dev; + + snprintf(sch_adapter.name, sizeof(sch_adapter.name), + "SMBus SCH adapter at %04x", sch_smba); + + retval = i2c_add_adapter(&sch_adapter); + if (retval) + sch_smba = 0; + + return retval; +} + +static int smbus_sch_remove(struct platform_device *pdev) +{ + if (sch_smba) { + i2c_del_adapter(&sch_adapter); + sch_smba = 0; + } + + return 0; +} + +static struct platform_driver smbus_sch_driver = { + .driver = { + .name = "isch_smbus", + }, + .probe = smbus_sch_probe, + .remove = smbus_sch_remove, +}; + +module_platform_driver(smbus_sch_driver); + +MODULE_AUTHOR("Jacob Pan "); +MODULE_DESCRIPTION("Intel SCH SMBus driver"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:isch_smbus"); -- cgit v1.2.3