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/watchdog/iTCO_wdt.c | 664 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 664 insertions(+) create mode 100644 drivers/watchdog/iTCO_wdt.c (limited to 'drivers/watchdog/iTCO_wdt.c') diff --git a/drivers/watchdog/iTCO_wdt.c b/drivers/watchdog/iTCO_wdt.c new file mode 100644 index 000000000..e937b4dd2 --- /dev/null +++ b/drivers/watchdog/iTCO_wdt.c @@ -0,0 +1,664 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * intel TCO Watchdog Driver + * + * (c) Copyright 2006-2011 Wim Van Sebroeck . + * + * Neither Wim Van Sebroeck nor Iguana vzw. admit liability nor + * provide warranty for any of this software. This material is + * provided "AS-IS" and at no charge. + * + * The TCO watchdog is implemented in the following I/O controller hubs: + * (See the intel documentation on http://developer.intel.com.) + * document number 290655-003, 290677-014: 82801AA (ICH), 82801AB (ICHO) + * document number 290687-002, 298242-027: 82801BA (ICH2) + * document number 290733-003, 290739-013: 82801CA (ICH3-S) + * document number 290716-001, 290718-007: 82801CAM (ICH3-M) + * document number 290744-001, 290745-025: 82801DB (ICH4) + * document number 252337-001, 252663-008: 82801DBM (ICH4-M) + * document number 273599-001, 273645-002: 82801E (C-ICH) + * document number 252516-001, 252517-028: 82801EB (ICH5), 82801ER (ICH5R) + * document number 300641-004, 300884-013: 6300ESB + * document number 301473-002, 301474-026: 82801F (ICH6) + * document number 313082-001, 313075-006: 631xESB, 632xESB + * document number 307013-003, 307014-024: 82801G (ICH7) + * document number 322896-001, 322897-001: NM10 + * document number 313056-003, 313057-017: 82801H (ICH8) + * document number 316972-004, 316973-012: 82801I (ICH9) + * document number 319973-002, 319974-002: 82801J (ICH10) + * document number 322169-001, 322170-003: 5 Series, 3400 Series (PCH) + * document number 320066-003, 320257-008: EP80597 (IICH) + * document number 324645-001, 324646-001: Cougar Point (CPT) + * document number TBD : Patsburg (PBG) + * document number TBD : DH89xxCC + * document number TBD : Panther Point + * document number TBD : Lynx Point + * document number TBD : Lynx Point-LP + */ + +/* + * Includes, defines, variables, module parameters, ... + */ + +/* Module and version information */ +#define DRV_NAME "iTCO_wdt" +#define DRV_VERSION "1.11" + +/* Includes */ +#include /* For ACPI support */ +#include /* For BIT() */ +#include /* For module specific items */ +#include /* For new moduleparam's */ +#include /* For standard types (like size_t) */ +#include /* For the -ENODEV/... values */ +#include /* For printk/panic/... */ +#include /* For the watchdog specific items */ +#include /* For __init/__exit/... */ +#include /* For file operations */ +#include /* For platform_driver framework */ +#include /* For pci functions */ +#include /* For io-port access */ +#include /* For spin_lock/spin_unlock/... */ +#include /* For copy_to_user/put_user/... */ +#include /* For inb/outb/... */ +#include +#include + +#include "iTCO_vendor.h" + +/* Address definitions for the TCO */ +/* TCO base address */ +#define TCOBASE(p) ((p)->tco_res->start) +/* SMI Control and Enable Register */ +#define SMI_EN(p) ((p)->smi_res->start) + +#define TCO_RLD(p) (TCOBASE(p) + 0x00) /* TCO Timer Reload/Curr. Value */ +#define TCOv1_TMR(p) (TCOBASE(p) + 0x01) /* TCOv1 Timer Initial Value*/ +#define TCO_DAT_IN(p) (TCOBASE(p) + 0x02) /* TCO Data In Register */ +#define TCO_DAT_OUT(p) (TCOBASE(p) + 0x03) /* TCO Data Out Register */ +#define TCO1_STS(p) (TCOBASE(p) + 0x04) /* TCO1 Status Register */ +#define TCO2_STS(p) (TCOBASE(p) + 0x06) /* TCO2 Status Register */ +#define TCO1_CNT(p) (TCOBASE(p) + 0x08) /* TCO1 Control Register */ +#define TCO2_CNT(p) (TCOBASE(p) + 0x0a) /* TCO2 Control Register */ +#define TCOv2_TMR(p) (TCOBASE(p) + 0x12) /* TCOv2 Timer Initial Value*/ + +/* internal variables */ +struct iTCO_wdt_private { + struct watchdog_device wddev; + + /* TCO version/generation */ + unsigned int iTCO_version; + struct resource *tco_res; + struct resource *smi_res; + /* + * NO_REBOOT flag is Memory-Mapped GCS register bit 5 (TCO version 2), + * or memory-mapped PMC register bit 4 (TCO version 3). + */ + unsigned long __iomem *gcs_pmc; + /* the lock for io operations */ + spinlock_t io_lock; + /* the PCI-device */ + struct pci_dev *pci_dev; + /* whether or not the watchdog has been suspended */ + bool suspended; + /* no reboot API private data */ + void *no_reboot_priv; + /* no reboot update function pointer */ + int (*update_no_reboot_bit)(void *p, bool set); +}; + +/* module parameters */ +#define WATCHDOG_TIMEOUT 30 /* 30 sec default heartbeat */ +static int heartbeat = WATCHDOG_TIMEOUT; /* in seconds */ +module_param(heartbeat, int, 0); +MODULE_PARM_DESC(heartbeat, "Watchdog timeout in seconds. " + "5..76 (TCO v1) or 3..614 (TCO v2), default=" + __MODULE_STRING(WATCHDOG_TIMEOUT) ")"); + +static bool nowayout = WATCHDOG_NOWAYOUT; +module_param(nowayout, bool, 0); +MODULE_PARM_DESC(nowayout, + "Watchdog cannot be stopped once started (default=" + __MODULE_STRING(WATCHDOG_NOWAYOUT) ")"); + +static int turn_SMI_watchdog_clear_off = 1; +module_param(turn_SMI_watchdog_clear_off, int, 0); +MODULE_PARM_DESC(turn_SMI_watchdog_clear_off, + "Turn off SMI clearing watchdog (depends on TCO-version)(default=1)"); + +/* + * Some TCO specific functions + */ + +/* + * The iTCO v1 and v2's internal timer is stored as ticks which decrement + * every 0.6 seconds. v3's internal timer is stored as seconds (some + * datasheets incorrectly state 0.6 seconds). + */ +static inline unsigned int seconds_to_ticks(struct iTCO_wdt_private *p, + int secs) +{ + return p->iTCO_version == 3 ? secs : (secs * 10) / 6; +} + +static inline unsigned int ticks_to_seconds(struct iTCO_wdt_private *p, + int ticks) +{ + return p->iTCO_version == 3 ? ticks : (ticks * 6) / 10; +} + +static inline u32 no_reboot_bit(struct iTCO_wdt_private *p) +{ + u32 enable_bit; + + switch (p->iTCO_version) { + case 5: + case 3: + enable_bit = 0x00000010; + break; + case 2: + enable_bit = 0x00000020; + break; + case 4: + case 1: + default: + enable_bit = 0x00000002; + break; + } + + return enable_bit; +} + +static int update_no_reboot_bit_def(void *priv, bool set) +{ + return 0; +} + +static int update_no_reboot_bit_pci(void *priv, bool set) +{ + struct iTCO_wdt_private *p = priv; + u32 val32 = 0, newval32 = 0; + + pci_read_config_dword(p->pci_dev, 0xd4, &val32); + if (set) + val32 |= no_reboot_bit(p); + else + val32 &= ~no_reboot_bit(p); + pci_write_config_dword(p->pci_dev, 0xd4, val32); + pci_read_config_dword(p->pci_dev, 0xd4, &newval32); + + /* make sure the update is successful */ + if (val32 != newval32) + return -EIO; + + return 0; +} + +static int update_no_reboot_bit_mem(void *priv, bool set) +{ + struct iTCO_wdt_private *p = priv; + u32 val32 = 0, newval32 = 0; + + val32 = readl(p->gcs_pmc); + if (set) + val32 |= no_reboot_bit(p); + else + val32 &= ~no_reboot_bit(p); + writel(val32, p->gcs_pmc); + newval32 = readl(p->gcs_pmc); + + /* make sure the update is successful */ + if (val32 != newval32) + return -EIO; + + return 0; +} + +static int update_no_reboot_bit_cnt(void *priv, bool set) +{ + struct iTCO_wdt_private *p = priv; + u16 val, newval; + + val = inw(TCO1_CNT(p)); + if (set) + val |= BIT(0); + else + val &= ~BIT(0); + outw(val, TCO1_CNT(p)); + newval = inw(TCO1_CNT(p)); + + /* make sure the update is successful */ + return val != newval ? -EIO : 0; +} + +static int update_no_reboot_bit_pmc(void *priv, bool set) +{ + struct intel_pmc_dev *pmc = priv; + u32 bits = PMC_CFG_NO_REBOOT_EN; + u32 value = set ? bits : 0; + + return intel_pmc_gcr_update(pmc, PMC_GCR_PMC_CFG_REG, bits, value); +} + +static void iTCO_wdt_no_reboot_bit_setup(struct iTCO_wdt_private *p, + struct platform_device *pdev, + struct itco_wdt_platform_data *pdata) +{ + if (pdata->no_reboot_use_pmc) { + struct intel_pmc_dev *pmc = dev_get_drvdata(pdev->dev.parent); + + p->update_no_reboot_bit = update_no_reboot_bit_pmc; + p->no_reboot_priv = pmc; + return; + } + + if (p->iTCO_version >= 6) + p->update_no_reboot_bit = update_no_reboot_bit_cnt; + else if (p->iTCO_version >= 2) + p->update_no_reboot_bit = update_no_reboot_bit_mem; + else if (p->iTCO_version == 1) + p->update_no_reboot_bit = update_no_reboot_bit_pci; + else + p->update_no_reboot_bit = update_no_reboot_bit_def; + + p->no_reboot_priv = p; +} + +static int iTCO_wdt_start(struct watchdog_device *wd_dev) +{ + struct iTCO_wdt_private *p = watchdog_get_drvdata(wd_dev); + unsigned int val; + + spin_lock(&p->io_lock); + + iTCO_vendor_pre_start(p->smi_res, wd_dev->timeout); + + /* disable chipset's NO_REBOOT bit */ + if (p->update_no_reboot_bit(p->no_reboot_priv, false)) { + spin_unlock(&p->io_lock); + dev_err(wd_dev->parent, "failed to reset NO_REBOOT flag, reboot disabled by hardware/BIOS\n"); + return -EIO; + } + + /* Force the timer to its reload value by writing to the TCO_RLD + register */ + if (p->iTCO_version >= 2) + outw(0x01, TCO_RLD(p)); + else if (p->iTCO_version == 1) + outb(0x01, TCO_RLD(p)); + + /* Bit 11: TCO Timer Halt -> 0 = The TCO timer is enabled to count */ + val = inw(TCO1_CNT(p)); + val &= 0xf7ff; + outw(val, TCO1_CNT(p)); + val = inw(TCO1_CNT(p)); + spin_unlock(&p->io_lock); + + if (val & 0x0800) + return -1; + return 0; +} + +static int iTCO_wdt_stop(struct watchdog_device *wd_dev) +{ + struct iTCO_wdt_private *p = watchdog_get_drvdata(wd_dev); + unsigned int val; + + spin_lock(&p->io_lock); + + iTCO_vendor_pre_stop(p->smi_res); + + /* Bit 11: TCO Timer Halt -> 1 = The TCO timer is disabled */ + val = inw(TCO1_CNT(p)); + val |= 0x0800; + outw(val, TCO1_CNT(p)); + val = inw(TCO1_CNT(p)); + + /* Set the NO_REBOOT bit to prevent later reboots, just for sure */ + p->update_no_reboot_bit(p->no_reboot_priv, true); + + spin_unlock(&p->io_lock); + + if ((val & 0x0800) == 0) + return -1; + return 0; +} + +static int iTCO_wdt_ping(struct watchdog_device *wd_dev) +{ + struct iTCO_wdt_private *p = watchdog_get_drvdata(wd_dev); + + spin_lock(&p->io_lock); + + /* Reload the timer by writing to the TCO Timer Counter register */ + if (p->iTCO_version >= 2) { + outw(0x01, TCO_RLD(p)); + } else if (p->iTCO_version == 1) { + /* Reset the timeout status bit so that the timer + * needs to count down twice again before rebooting */ + outw(0x0008, TCO1_STS(p)); /* write 1 to clear bit */ + + outb(0x01, TCO_RLD(p)); + } + + spin_unlock(&p->io_lock); + return 0; +} + +static int iTCO_wdt_set_timeout(struct watchdog_device *wd_dev, unsigned int t) +{ + struct iTCO_wdt_private *p = watchdog_get_drvdata(wd_dev); + unsigned int val16; + unsigned char val8; + unsigned int tmrval; + + tmrval = seconds_to_ticks(p, t); + + /* For TCO v1 the timer counts down twice before rebooting */ + if (p->iTCO_version == 1) + tmrval /= 2; + + /* from the specs: */ + /* "Values of 0h-3h are ignored and should not be attempted" */ + if (tmrval < 0x04) + return -EINVAL; + if ((p->iTCO_version >= 2 && tmrval > 0x3ff) || + (p->iTCO_version == 1 && tmrval > 0x03f)) + return -EINVAL; + + /* Write new heartbeat to watchdog */ + if (p->iTCO_version >= 2) { + spin_lock(&p->io_lock); + val16 = inw(TCOv2_TMR(p)); + val16 &= 0xfc00; + val16 |= tmrval; + outw(val16, TCOv2_TMR(p)); + val16 = inw(TCOv2_TMR(p)); + spin_unlock(&p->io_lock); + + if ((val16 & 0x3ff) != tmrval) + return -EINVAL; + } else if (p->iTCO_version == 1) { + spin_lock(&p->io_lock); + val8 = inb(TCOv1_TMR(p)); + val8 &= 0xc0; + val8 |= (tmrval & 0xff); + outb(val8, TCOv1_TMR(p)); + val8 = inb(TCOv1_TMR(p)); + spin_unlock(&p->io_lock); + + if ((val8 & 0x3f) != tmrval) + return -EINVAL; + } + + wd_dev->timeout = t; + return 0; +} + +static unsigned int iTCO_wdt_get_timeleft(struct watchdog_device *wd_dev) +{ + struct iTCO_wdt_private *p = watchdog_get_drvdata(wd_dev); + unsigned int val16; + unsigned char val8; + unsigned int time_left = 0; + + /* read the TCO Timer */ + if (p->iTCO_version >= 2) { + spin_lock(&p->io_lock); + val16 = inw(TCO_RLD(p)); + val16 &= 0x3ff; + spin_unlock(&p->io_lock); + + time_left = ticks_to_seconds(p, val16); + } else if (p->iTCO_version == 1) { + spin_lock(&p->io_lock); + val8 = inb(TCO_RLD(p)); + val8 &= 0x3f; + if (!(inw(TCO1_STS(p)) & 0x0008)) + val8 += (inb(TCOv1_TMR(p)) & 0x3f); + spin_unlock(&p->io_lock); + + time_left = ticks_to_seconds(p, val8); + } + return time_left; +} + +/* Returns true if the watchdog was running */ +static bool iTCO_wdt_set_running(struct iTCO_wdt_private *p) +{ + u16 val; + + /* Bit 11: TCO Timer Halt -> 0 = The TCO timer is enabled */ + val = inw(TCO1_CNT(p)); + if (!(val & BIT(11))) { + set_bit(WDOG_HW_RUNNING, &p->wddev.status); + return true; + } + return false; +} + +/* + * Kernel Interfaces + */ + +static const struct watchdog_info ident = { + .options = WDIOF_SETTIMEOUT | + WDIOF_KEEPALIVEPING | + WDIOF_MAGICCLOSE, + .firmware_version = 0, + .identity = DRV_NAME, +}; + +static const struct watchdog_ops iTCO_wdt_ops = { + .owner = THIS_MODULE, + .start = iTCO_wdt_start, + .stop = iTCO_wdt_stop, + .ping = iTCO_wdt_ping, + .set_timeout = iTCO_wdt_set_timeout, + .get_timeleft = iTCO_wdt_get_timeleft, +}; + +/* + * Init & exit routines + */ + +static int iTCO_wdt_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct itco_wdt_platform_data *pdata = dev_get_platdata(dev); + struct iTCO_wdt_private *p; + unsigned long val32; + int ret; + + if (!pdata) + return -ENODEV; + + p = devm_kzalloc(dev, sizeof(*p), GFP_KERNEL); + if (!p) + return -ENOMEM; + + spin_lock_init(&p->io_lock); + + p->tco_res = platform_get_resource(pdev, IORESOURCE_IO, ICH_RES_IO_TCO); + if (!p->tco_res) + return -ENODEV; + + p->iTCO_version = pdata->version; + p->pci_dev = to_pci_dev(dev->parent); + + p->smi_res = platform_get_resource(pdev, IORESOURCE_IO, ICH_RES_IO_SMI); + if (p->smi_res) { + /* The TCO logic uses the TCO_EN bit in the SMI_EN register */ + if (!devm_request_region(dev, p->smi_res->start, + resource_size(p->smi_res), + pdev->name)) { + dev_err(dev, "I/O address 0x%04llx already in use, device disabled\n", + (u64)SMI_EN(p)); + return -EBUSY; + } + } else if (iTCO_vendorsupport || + turn_SMI_watchdog_clear_off >= p->iTCO_version) { + dev_err(dev, "SMI I/O resource is missing\n"); + return -ENODEV; + } + + iTCO_wdt_no_reboot_bit_setup(p, pdev, pdata); + + /* + * Get the Memory-Mapped GCS or PMC register, we need it for the + * NO_REBOOT flag (TCO v2 and v3). + */ + if (p->iTCO_version >= 2 && p->iTCO_version < 6 && + !pdata->no_reboot_use_pmc) { + p->gcs_pmc = devm_platform_ioremap_resource(pdev, ICH_RES_MEM_GCS_PMC); + if (IS_ERR(p->gcs_pmc)) + return PTR_ERR(p->gcs_pmc); + } + + /* Check chipset's NO_REBOOT bit */ + if (p->update_no_reboot_bit(p->no_reboot_priv, false) && + iTCO_vendor_check_noreboot_on()) { + dev_info(dev, "unable to reset NO_REBOOT flag, device disabled by hardware/BIOS\n"); + return -ENODEV; /* Cannot reset NO_REBOOT bit */ + } + + if (turn_SMI_watchdog_clear_off >= p->iTCO_version) { + /* + * Bit 13: TCO_EN -> 0 + * Disables TCO logic generating an SMI# + */ + val32 = inl(SMI_EN(p)); + val32 &= 0xffffdfff; /* Turn off SMI clearing watchdog */ + outl(val32, SMI_EN(p)); + } + + if (!devm_request_region(dev, p->tco_res->start, + resource_size(p->tco_res), + pdev->name)) { + dev_err(dev, "I/O address 0x%04llx already in use, device disabled\n", + (u64)TCOBASE(p)); + return -EBUSY; + } + + dev_info(dev, "Found a %s TCO device (Version=%d, TCOBASE=0x%04llx)\n", + pdata->name, pdata->version, (u64)TCOBASE(p)); + + /* Clear out the (probably old) status */ + switch (p->iTCO_version) { + case 6: + case 5: + case 4: + outw(0x0008, TCO1_STS(p)); /* Clear the Time Out Status bit */ + outw(0x0002, TCO2_STS(p)); /* Clear SECOND_TO_STS bit */ + break; + case 3: + outl(0x20008, TCO1_STS(p)); + break; + case 2: + case 1: + default: + outw(0x0008, TCO1_STS(p)); /* Clear the Time Out Status bit */ + outw(0x0002, TCO2_STS(p)); /* Clear SECOND_TO_STS bit */ + outw(0x0004, TCO2_STS(p)); /* Clear BOOT_STS bit */ + break; + } + + p->wddev.info = &ident, + p->wddev.ops = &iTCO_wdt_ops, + p->wddev.bootstatus = 0; + p->wddev.timeout = WATCHDOG_TIMEOUT; + watchdog_set_nowayout(&p->wddev, nowayout); + p->wddev.parent = dev; + + watchdog_set_drvdata(&p->wddev, p); + platform_set_drvdata(pdev, p); + + if (!iTCO_wdt_set_running(p)) { + /* + * If the watchdog was not running set NO_REBOOT now to + * prevent later reboots. + */ + p->update_no_reboot_bit(p->no_reboot_priv, true); + } + + /* Check that the heartbeat value is within it's range; + if not reset to the default */ + if (iTCO_wdt_set_timeout(&p->wddev, heartbeat)) { + iTCO_wdt_set_timeout(&p->wddev, WATCHDOG_TIMEOUT); + dev_info(dev, "timeout value out of range, using %d\n", + WATCHDOG_TIMEOUT); + } + + watchdog_stop_on_reboot(&p->wddev); + watchdog_stop_on_unregister(&p->wddev); + ret = devm_watchdog_register_device(dev, &p->wddev); + if (ret != 0) { + dev_err(dev, "cannot register watchdog device (err=%d)\n", ret); + return ret; + } + + dev_info(dev, "initialized. heartbeat=%d sec (nowayout=%d)\n", + heartbeat, nowayout); + + return 0; +} + +/* + * Suspend-to-idle requires this, because it stops the ticks and timekeeping, so + * the watchdog cannot be pinged while in that state. In ACPI sleep states the + * watchdog is stopped by the platform firmware. + */ + +#ifdef CONFIG_ACPI +static inline bool __maybe_unused need_suspend(void) +{ + return acpi_target_system_state() == ACPI_STATE_S0; +} +#else +static inline bool __maybe_unused need_suspend(void) { return true; } +#endif + +static int __maybe_unused iTCO_wdt_suspend_noirq(struct device *dev) +{ + struct iTCO_wdt_private *p = dev_get_drvdata(dev); + int ret = 0; + + p->suspended = false; + if (watchdog_active(&p->wddev) && need_suspend()) { + ret = iTCO_wdt_stop(&p->wddev); + if (!ret) + p->suspended = true; + } + return ret; +} + +static int __maybe_unused iTCO_wdt_resume_noirq(struct device *dev) +{ + struct iTCO_wdt_private *p = dev_get_drvdata(dev); + + if (p->suspended) + iTCO_wdt_start(&p->wddev); + + return 0; +} + +static const struct dev_pm_ops iTCO_wdt_pm = { + SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(iTCO_wdt_suspend_noirq, + iTCO_wdt_resume_noirq) +}; + +static struct platform_driver iTCO_wdt_driver = { + .probe = iTCO_wdt_probe, + .driver = { + .name = DRV_NAME, + .pm = &iTCO_wdt_pm, + }, +}; + +module_platform_driver(iTCO_wdt_driver); + +MODULE_AUTHOR("Wim Van Sebroeck "); +MODULE_DESCRIPTION("Intel TCO WatchDog Timer Driver"); +MODULE_VERSION(DRV_VERSION); +MODULE_LICENSE("GPL"); +MODULE_ALIAS("platform:" DRV_NAME); -- cgit v1.2.3