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-au1550.c | 392 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 392 insertions(+) create mode 100644 drivers/i2c/busses/i2c-au1550.c (limited to 'drivers/i2c/busses/i2c-au1550.c') diff --git a/drivers/i2c/busses/i2c-au1550.c b/drivers/i2c/busses/i2c-au1550.c new file mode 100644 index 000000000..99bd24d0e --- /dev/null +++ b/drivers/i2c/busses/i2c-au1550.c @@ -0,0 +1,392 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * i2c-au1550.c: SMBus (i2c) adapter for Alchemy PSC interface + * Copyright (C) 2004 Embedded Edge, LLC + * + * 2.6 port by Matt Porter + * + * The documentation describes this as an SMBus controller, but it doesn't + * understand any of the SMBus protocol in hardware. It's really an I2C + * controller that could emulate most of the SMBus in software. + * + * This is just a skeleton adapter to use with the Au1550 PSC + * algorithm. It was developed for the Pb1550, but will work with + * any Au1550 board that has a similar PSC configuration. + */ + +#include +#include +#include +#include +#include +#include +#include + +#include +#include + +#define PSC_SEL 0x00 +#define PSC_CTRL 0x04 +#define PSC_SMBCFG 0x08 +#define PSC_SMBMSK 0x0C +#define PSC_SMBPCR 0x10 +#define PSC_SMBSTAT 0x14 +#define PSC_SMBEVNT 0x18 +#define PSC_SMBTXRX 0x1C +#define PSC_SMBTMR 0x20 + +struct i2c_au1550_data { + void __iomem *psc_base; + int xfer_timeout; + struct i2c_adapter adap; +}; + +static inline void WR(struct i2c_au1550_data *a, int r, unsigned long v) +{ + __raw_writel(v, a->psc_base + r); + wmb(); +} + +static inline unsigned long RD(struct i2c_au1550_data *a, int r) +{ + return __raw_readl(a->psc_base + r); +} + +static int wait_xfer_done(struct i2c_au1550_data *adap) +{ + int i; + + /* Wait for Tx Buffer Empty */ + for (i = 0; i < adap->xfer_timeout; i++) { + if (RD(adap, PSC_SMBSTAT) & PSC_SMBSTAT_TE) + return 0; + + udelay(1); + } + + return -ETIMEDOUT; +} + +static int wait_ack(struct i2c_au1550_data *adap) +{ + unsigned long stat; + + if (wait_xfer_done(adap)) + return -ETIMEDOUT; + + stat = RD(adap, PSC_SMBEVNT); + if ((stat & (PSC_SMBEVNT_DN | PSC_SMBEVNT_AN | PSC_SMBEVNT_AL)) != 0) + return -ETIMEDOUT; + + return 0; +} + +static int wait_master_done(struct i2c_au1550_data *adap) +{ + int i; + + /* Wait for Master Done. */ + for (i = 0; i < 2 * adap->xfer_timeout; i++) { + if ((RD(adap, PSC_SMBEVNT) & PSC_SMBEVNT_MD) != 0) + return 0; + udelay(1); + } + + return -ETIMEDOUT; +} + +static int +do_address(struct i2c_au1550_data *adap, unsigned int addr, int rd, int q) +{ + unsigned long stat; + + /* Reset the FIFOs, clear events. */ + stat = RD(adap, PSC_SMBSTAT); + WR(adap, PSC_SMBEVNT, PSC_SMBEVNT_ALLCLR); + + if (!(stat & PSC_SMBSTAT_TE) || !(stat & PSC_SMBSTAT_RE)) { + WR(adap, PSC_SMBPCR, PSC_SMBPCR_DC); + while ((RD(adap, PSC_SMBPCR) & PSC_SMBPCR_DC) != 0) + cpu_relax(); + udelay(50); + } + + /* Write out the i2c chip address and specify operation */ + addr <<= 1; + if (rd) + addr |= 1; + + /* zero-byte xfers stop immediately */ + if (q) + addr |= PSC_SMBTXRX_STP; + + /* Put byte into fifo, start up master. */ + WR(adap, PSC_SMBTXRX, addr); + WR(adap, PSC_SMBPCR, PSC_SMBPCR_MS); + if (wait_ack(adap)) + return -EIO; + return (q) ? wait_master_done(adap) : 0; +} + +static int wait_for_rx_byte(struct i2c_au1550_data *adap, unsigned char *out) +{ + int j; + + if (wait_xfer_done(adap)) + return -EIO; + + j = adap->xfer_timeout * 100; + do { + j--; + if (j <= 0) + return -EIO; + + if ((RD(adap, PSC_SMBSTAT) & PSC_SMBSTAT_RE) == 0) + j = 0; + else + udelay(1); + } while (j > 0); + + *out = RD(adap, PSC_SMBTXRX); + + return 0; +} + +static int i2c_read(struct i2c_au1550_data *adap, unsigned char *buf, + unsigned int len) +{ + int i; + + if (len == 0) + return 0; + + /* A read is performed by stuffing the transmit fifo with + * zero bytes for timing, waiting for bytes to appear in the + * receive fifo, then reading the bytes. + */ + i = 0; + while (i < (len - 1)) { + WR(adap, PSC_SMBTXRX, 0); + if (wait_for_rx_byte(adap, &buf[i])) + return -EIO; + + i++; + } + + /* The last byte has to indicate transfer done. */ + WR(adap, PSC_SMBTXRX, PSC_SMBTXRX_STP); + if (wait_master_done(adap)) + return -EIO; + + buf[i] = (unsigned char)(RD(adap, PSC_SMBTXRX) & 0xff); + return 0; +} + +static int i2c_write(struct i2c_au1550_data *adap, unsigned char *buf, + unsigned int len) +{ + int i; + unsigned long data; + + if (len == 0) + return 0; + + i = 0; + while (i < (len-1)) { + data = buf[i]; + WR(adap, PSC_SMBTXRX, data); + if (wait_ack(adap)) + return -EIO; + i++; + } + + /* The last byte has to indicate transfer done. */ + data = buf[i]; + data |= PSC_SMBTXRX_STP; + WR(adap, PSC_SMBTXRX, data); + if (wait_master_done(adap)) + return -EIO; + return 0; +} + +static int +au1550_xfer(struct i2c_adapter *i2c_adap, struct i2c_msg *msgs, int num) +{ + struct i2c_au1550_data *adap = i2c_adap->algo_data; + struct i2c_msg *p; + int i, err = 0; + + WR(adap, PSC_CTRL, PSC_CTRL_ENABLE); + + for (i = 0; !err && i < num; i++) { + p = &msgs[i]; + err = do_address(adap, p->addr, p->flags & I2C_M_RD, + (p->len == 0)); + if (err || !p->len) + continue; + if (p->flags & I2C_M_RD) + err = i2c_read(adap, p->buf, p->len); + else + err = i2c_write(adap, p->buf, p->len); + } + + /* Return the number of messages processed, or the error code. + */ + if (err == 0) + err = num; + + WR(adap, PSC_CTRL, PSC_CTRL_SUSPEND); + + return err; +} + +static u32 au1550_func(struct i2c_adapter *adap) +{ + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; +} + +static const struct i2c_algorithm au1550_algo = { + .master_xfer = au1550_xfer, + .functionality = au1550_func, +}; + +static void i2c_au1550_setup(struct i2c_au1550_data *priv) +{ + unsigned long cfg; + + WR(priv, PSC_CTRL, PSC_CTRL_DISABLE); + WR(priv, PSC_SEL, PSC_SEL_PS_SMBUSMODE); + WR(priv, PSC_SMBCFG, 0); + WR(priv, PSC_CTRL, PSC_CTRL_ENABLE); + while ((RD(priv, PSC_SMBSTAT) & PSC_SMBSTAT_SR) == 0) + cpu_relax(); + + cfg = PSC_SMBCFG_RT_FIFO8 | PSC_SMBCFG_TT_FIFO8 | PSC_SMBCFG_DD_DISABLE; + WR(priv, PSC_SMBCFG, cfg); + + /* Divide by 8 to get a 6.25 MHz clock. The later protocol + * timings are based on this clock. + */ + cfg |= PSC_SMBCFG_SET_DIV(PSC_SMBCFG_DIV8); + WR(priv, PSC_SMBCFG, cfg); + WR(priv, PSC_SMBMSK, PSC_SMBMSK_ALLMASK); + + /* Set the protocol timer values. See Table 71 in the + * Au1550 Data Book for standard timing values. + */ + WR(priv, PSC_SMBTMR, PSC_SMBTMR_SET_TH(0) | PSC_SMBTMR_SET_PS(20) | \ + PSC_SMBTMR_SET_PU(20) | PSC_SMBTMR_SET_SH(20) | \ + PSC_SMBTMR_SET_SU(20) | PSC_SMBTMR_SET_CL(20) | \ + PSC_SMBTMR_SET_CH(20)); + + cfg |= PSC_SMBCFG_DE_ENABLE; + WR(priv, PSC_SMBCFG, cfg); + while ((RD(priv, PSC_SMBSTAT) & PSC_SMBSTAT_SR) == 0) + cpu_relax(); + + WR(priv, PSC_CTRL, PSC_CTRL_SUSPEND); +} + +static void i2c_au1550_disable(struct i2c_au1550_data *priv) +{ + WR(priv, PSC_SMBCFG, 0); + WR(priv, PSC_CTRL, PSC_CTRL_DISABLE); +} + +/* + * registering functions to load algorithms at runtime + * Prior to calling us, the 50MHz clock frequency and routing + * must have been set up for the PSC indicated by the adapter. + */ +static int +i2c_au1550_probe(struct platform_device *pdev) +{ + struct i2c_au1550_data *priv; + struct resource *r; + int ret; + + priv = devm_kzalloc(&pdev->dev, sizeof(struct i2c_au1550_data), + GFP_KERNEL); + if (!priv) + return -ENOMEM; + + r = platform_get_resource(pdev, IORESOURCE_MEM, 0); + priv->psc_base = devm_ioremap_resource(&pdev->dev, r); + if (IS_ERR(priv->psc_base)) + return PTR_ERR(priv->psc_base); + + priv->xfer_timeout = 200; + + priv->adap.nr = pdev->id; + priv->adap.algo = &au1550_algo; + priv->adap.algo_data = priv; + priv->adap.dev.parent = &pdev->dev; + strscpy(priv->adap.name, "Au1xxx PSC I2C", sizeof(priv->adap.name)); + + /* Now, set up the PSC for SMBus PIO mode. */ + i2c_au1550_setup(priv); + + ret = i2c_add_numbered_adapter(&priv->adap); + if (ret) { + i2c_au1550_disable(priv); + return ret; + } + + platform_set_drvdata(pdev, priv); + return 0; +} + +static int i2c_au1550_remove(struct platform_device *pdev) +{ + struct i2c_au1550_data *priv = platform_get_drvdata(pdev); + + i2c_del_adapter(&priv->adap); + i2c_au1550_disable(priv); + return 0; +} + +#ifdef CONFIG_PM +static int i2c_au1550_suspend(struct device *dev) +{ + struct i2c_au1550_data *priv = dev_get_drvdata(dev); + + i2c_au1550_disable(priv); + + return 0; +} + +static int i2c_au1550_resume(struct device *dev) +{ + struct i2c_au1550_data *priv = dev_get_drvdata(dev); + + i2c_au1550_setup(priv); + + return 0; +} + +static const struct dev_pm_ops i2c_au1550_pmops = { + .suspend = i2c_au1550_suspend, + .resume = i2c_au1550_resume, +}; + +#define AU1XPSC_SMBUS_PMOPS (&i2c_au1550_pmops) + +#else +#define AU1XPSC_SMBUS_PMOPS NULL +#endif + +static struct platform_driver au1xpsc_smbus_driver = { + .driver = { + .name = "au1xpsc_smbus", + .pm = AU1XPSC_SMBUS_PMOPS, + }, + .probe = i2c_au1550_probe, + .remove = i2c_au1550_remove, +}; + +module_platform_driver(au1xpsc_smbus_driver); + +MODULE_AUTHOR("Dan Malek, Embedded Edge, LLC."); +MODULE_DESCRIPTION("SMBus adapter Alchemy pb1550"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:au1xpsc_smbus"); -- cgit v1.2.3