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authorLibravatar Linus Torvalds <torvalds@linux-foundation.org>2023-02-21 18:24:12 -0800
committerLibravatar Linus Torvalds <torvalds@linux-foundation.org>2023-02-21 18:24:12 -0800
commit5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 (patch)
treecc5c2d0a898769fd59549594fedb3ee6f84e59a0 /drivers/watchdog/rzg2l_wdt.c
downloadlinux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.tar.gz
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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(). ...
Diffstat (limited to 'drivers/watchdog/rzg2l_wdt.c')
-rw-r--r--drivers/watchdog/rzg2l_wdt.c301
1 files changed, 301 insertions, 0 deletions
diff --git a/drivers/watchdog/rzg2l_wdt.c b/drivers/watchdog/rzg2l_wdt.c
new file mode 100644
index 000000000..974a4194a
--- /dev/null
+++ b/drivers/watchdog/rzg2l_wdt.c
@@ -0,0 +1,301 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Renesas RZ/G2L WDT Watchdog Driver
+ *
+ * Copyright (C) 2021 Renesas Electronics Corporation
+ */
+#include <linux/bitops.h>
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/reset.h>
+#include <linux/units.h>
+#include <linux/watchdog.h>
+
+#define WDTCNT 0x00
+#define WDTSET 0x04
+#define WDTTIM 0x08
+#define WDTINT 0x0C
+#define PECR 0x10
+#define PEEN 0x14
+#define WDTCNT_WDTEN BIT(0)
+#define WDTINT_INTDISP BIT(0)
+#define PEEN_FORCE BIT(0)
+
+#define WDT_DEFAULT_TIMEOUT 60U
+
+/* Setting period time register only 12 bit set in WDTSET[31:20] */
+#define WDTSET_COUNTER_MASK (0xFFF00000)
+#define WDTSET_COUNTER_VAL(f) ((f) << 20)
+
+#define F2CYCLE_NSEC(f) (1000000000 / (f))
+
+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) ")");
+
+enum rz_wdt_type {
+ WDT_RZG2L,
+ WDT_RZV2M,
+};
+
+struct rzg2l_wdt_priv {
+ void __iomem *base;
+ struct watchdog_device wdev;
+ struct reset_control *rstc;
+ unsigned long osc_clk_rate;
+ unsigned long delay;
+ struct clk *pclk;
+ struct clk *osc_clk;
+ enum rz_wdt_type devtype;
+};
+
+static void rzg2l_wdt_wait_delay(struct rzg2l_wdt_priv *priv)
+{
+ /* delay timer when change the setting register */
+ ndelay(priv->delay);
+}
+
+static u32 rzg2l_wdt_get_cycle_usec(unsigned long cycle, u32 wdttime)
+{
+ u64 timer_cycle_us = 1024 * 1024ULL * (wdttime + 1) * MICRO;
+
+ return div64_ul(timer_cycle_us, cycle);
+}
+
+static void rzg2l_wdt_write(struct rzg2l_wdt_priv *priv, u32 val, unsigned int reg)
+{
+ if (reg == WDTSET)
+ val &= WDTSET_COUNTER_MASK;
+
+ writel_relaxed(val, priv->base + reg);
+ /* Registers other than the WDTINT is always synchronized with WDT_CLK */
+ if (reg != WDTINT)
+ rzg2l_wdt_wait_delay(priv);
+}
+
+static void rzg2l_wdt_init_timeout(struct watchdog_device *wdev)
+{
+ struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev);
+ u32 time_out;
+
+ /* Clear Lapsed Time Register and clear Interrupt */
+ rzg2l_wdt_write(priv, WDTINT_INTDISP, WDTINT);
+ /* 2 consecutive overflow cycle needed to trigger reset */
+ time_out = (wdev->timeout * (MICRO / 2)) /
+ rzg2l_wdt_get_cycle_usec(priv->osc_clk_rate, 0);
+ rzg2l_wdt_write(priv, WDTSET_COUNTER_VAL(time_out), WDTSET);
+}
+
+static int rzg2l_wdt_start(struct watchdog_device *wdev)
+{
+ struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev);
+
+ pm_runtime_get_sync(wdev->parent);
+
+ /* Initialize time out */
+ rzg2l_wdt_init_timeout(wdev);
+
+ /* Initialize watchdog counter register */
+ rzg2l_wdt_write(priv, 0, WDTTIM);
+
+ /* Enable watchdog timer*/
+ rzg2l_wdt_write(priv, WDTCNT_WDTEN, WDTCNT);
+
+ return 0;
+}
+
+static int rzg2l_wdt_stop(struct watchdog_device *wdev)
+{
+ struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev);
+
+ pm_runtime_put(wdev->parent);
+ reset_control_reset(priv->rstc);
+
+ return 0;
+}
+
+static int rzg2l_wdt_set_timeout(struct watchdog_device *wdev, unsigned int timeout)
+{
+ struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev);
+
+ wdev->timeout = timeout;
+
+ /*
+ * If the watchdog is active, reset the module for updating the WDTSET
+ * register so that it is updated with new timeout values.
+ */
+ if (watchdog_active(wdev)) {
+ pm_runtime_put(wdev->parent);
+ reset_control_reset(priv->rstc);
+ rzg2l_wdt_start(wdev);
+ }
+
+ return 0;
+}
+
+static int rzg2l_wdt_restart(struct watchdog_device *wdev,
+ unsigned long action, void *data)
+{
+ struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev);
+
+ clk_prepare_enable(priv->pclk);
+ clk_prepare_enable(priv->osc_clk);
+
+ if (priv->devtype == WDT_RZG2L) {
+ /* Generate Reset (WDTRSTB) Signal on parity error */
+ rzg2l_wdt_write(priv, 0, PECR);
+
+ /* Force parity error */
+ rzg2l_wdt_write(priv, PEEN_FORCE, PEEN);
+ } else {
+ /* RZ/V2M doesn't have parity error registers */
+
+ wdev->timeout = 0;
+
+ /* Initialize time out */
+ rzg2l_wdt_init_timeout(wdev);
+
+ /* Initialize watchdog counter register */
+ rzg2l_wdt_write(priv, 0, WDTTIM);
+
+ /* Enable watchdog timer*/
+ rzg2l_wdt_write(priv, WDTCNT_WDTEN, WDTCNT);
+
+ /* Wait 2 consecutive overflow cycles for reset */
+ mdelay(DIV_ROUND_UP(2 * 0xFFFFF * 1000, priv->osc_clk_rate));
+ }
+
+ return 0;
+}
+
+static const struct watchdog_info rzg2l_wdt_ident = {
+ .options = WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING | WDIOF_SETTIMEOUT,
+ .identity = "Renesas RZ/G2L WDT Watchdog",
+};
+
+static int rzg2l_wdt_ping(struct watchdog_device *wdev)
+{
+ struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev);
+
+ rzg2l_wdt_write(priv, WDTINT_INTDISP, WDTINT);
+
+ return 0;
+}
+
+static const struct watchdog_ops rzg2l_wdt_ops = {
+ .owner = THIS_MODULE,
+ .start = rzg2l_wdt_start,
+ .stop = rzg2l_wdt_stop,
+ .ping = rzg2l_wdt_ping,
+ .set_timeout = rzg2l_wdt_set_timeout,
+ .restart = rzg2l_wdt_restart,
+};
+
+static void rzg2l_wdt_reset_assert_pm_disable(void *data)
+{
+ struct watchdog_device *wdev = data;
+ struct rzg2l_wdt_priv *priv = watchdog_get_drvdata(wdev);
+
+ pm_runtime_disable(wdev->parent);
+ reset_control_assert(priv->rstc);
+}
+
+static int rzg2l_wdt_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct rzg2l_wdt_priv *priv;
+ unsigned long pclk_rate;
+ int ret;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(priv->base))
+ return PTR_ERR(priv->base);
+
+ /* Get watchdog main clock */
+ priv->osc_clk = devm_clk_get(&pdev->dev, "oscclk");
+ if (IS_ERR(priv->osc_clk))
+ return dev_err_probe(&pdev->dev, PTR_ERR(priv->osc_clk), "no oscclk");
+
+ priv->osc_clk_rate = clk_get_rate(priv->osc_clk);
+ if (!priv->osc_clk_rate)
+ return dev_err_probe(&pdev->dev, -EINVAL, "oscclk rate is 0");
+
+ /* Get Peripheral clock */
+ priv->pclk = devm_clk_get(&pdev->dev, "pclk");
+ if (IS_ERR(priv->pclk))
+ return dev_err_probe(&pdev->dev, PTR_ERR(priv->pclk), "no pclk");
+
+ pclk_rate = clk_get_rate(priv->pclk);
+ if (!pclk_rate)
+ return dev_err_probe(&pdev->dev, -EINVAL, "pclk rate is 0");
+
+ priv->delay = F2CYCLE_NSEC(priv->osc_clk_rate) * 6 + F2CYCLE_NSEC(pclk_rate) * 9;
+
+ priv->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
+ if (IS_ERR(priv->rstc))
+ return dev_err_probe(&pdev->dev, PTR_ERR(priv->rstc),
+ "failed to get cpg reset");
+
+ ret = reset_control_deassert(priv->rstc);
+ if (ret)
+ return dev_err_probe(dev, ret, "failed to deassert");
+
+ priv->devtype = (uintptr_t)of_device_get_match_data(dev);
+
+ pm_runtime_enable(&pdev->dev);
+
+ priv->wdev.info = &rzg2l_wdt_ident;
+ priv->wdev.ops = &rzg2l_wdt_ops;
+ priv->wdev.parent = dev;
+ priv->wdev.min_timeout = 1;
+ priv->wdev.max_timeout = rzg2l_wdt_get_cycle_usec(priv->osc_clk_rate, 0xfff) /
+ USEC_PER_SEC;
+ priv->wdev.timeout = WDT_DEFAULT_TIMEOUT;
+
+ watchdog_set_drvdata(&priv->wdev, priv);
+ ret = devm_add_action_or_reset(&pdev->dev,
+ rzg2l_wdt_reset_assert_pm_disable,
+ &priv->wdev);
+ if (ret < 0)
+ return ret;
+
+ watchdog_set_nowayout(&priv->wdev, nowayout);
+ watchdog_stop_on_unregister(&priv->wdev);
+
+ ret = watchdog_init_timeout(&priv->wdev, 0, dev);
+ if (ret)
+ dev_warn(dev, "Specified timeout invalid, using default");
+
+ return devm_watchdog_register_device(&pdev->dev, &priv->wdev);
+}
+
+static const struct of_device_id rzg2l_wdt_ids[] = {
+ { .compatible = "renesas,rzg2l-wdt", .data = (void *)WDT_RZG2L },
+ { .compatible = "renesas,rzv2m-wdt", .data = (void *)WDT_RZV2M },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, rzg2l_wdt_ids);
+
+static struct platform_driver rzg2l_wdt_driver = {
+ .driver = {
+ .name = "rzg2l_wdt",
+ .of_match_table = rzg2l_wdt_ids,
+ },
+ .probe = rzg2l_wdt_probe,
+};
+module_platform_driver(rzg2l_wdt_driver);
+
+MODULE_DESCRIPTION("Renesas RZ/G2L WDT Watchdog Driver");
+MODULE_AUTHOR("Biju Das <biju.das.jz@bp.renesas.com>");
+MODULE_LICENSE("GPL v2");