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/staging/greybus/pwm.c | 351 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 351 insertions(+) create mode 100644 drivers/staging/greybus/pwm.c (limited to 'drivers/staging/greybus/pwm.c') diff --git a/drivers/staging/greybus/pwm.c b/drivers/staging/greybus/pwm.c new file mode 100644 index 000000000..3fda17223 --- /dev/null +++ b/drivers/staging/greybus/pwm.c @@ -0,0 +1,351 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * PWM Greybus driver. + * + * Copyright 2014 Google Inc. + * Copyright 2014 Linaro Ltd. + */ + +#include +#include +#include +#include +#include + +#include "gbphy.h" + +struct gb_pwm_chip { + struct gb_connection *connection; + u8 pwm_max; /* max pwm number */ + + struct pwm_chip chip; + struct pwm_chip *pwm; +}; +#define pwm_chip_to_gb_pwm_chip(chip) \ + container_of(chip, struct gb_pwm_chip, chip) + + +static int gb_pwm_count_operation(struct gb_pwm_chip *pwmc) +{ + struct gb_pwm_count_response response; + int ret; + + ret = gb_operation_sync(pwmc->connection, GB_PWM_TYPE_PWM_COUNT, + NULL, 0, &response, sizeof(response)); + if (ret) + return ret; + pwmc->pwm_max = response.count; + return 0; +} + +static int gb_pwm_activate_operation(struct gb_pwm_chip *pwmc, + u8 which) +{ + struct gb_pwm_activate_request request; + struct gbphy_device *gbphy_dev; + int ret; + + if (which > pwmc->pwm_max) + return -EINVAL; + + request.which = which; + + gbphy_dev = to_gbphy_dev(pwmc->chip.dev); + ret = gbphy_runtime_get_sync(gbphy_dev); + if (ret) + return ret; + + ret = gb_operation_sync(pwmc->connection, GB_PWM_TYPE_ACTIVATE, + &request, sizeof(request), NULL, 0); + + gbphy_runtime_put_autosuspend(gbphy_dev); + + return ret; +} + +static int gb_pwm_deactivate_operation(struct gb_pwm_chip *pwmc, + u8 which) +{ + struct gb_pwm_deactivate_request request; + struct gbphy_device *gbphy_dev; + int ret; + + if (which > pwmc->pwm_max) + return -EINVAL; + + request.which = which; + + gbphy_dev = to_gbphy_dev(pwmc->chip.dev); + ret = gbphy_runtime_get_sync(gbphy_dev); + if (ret) + return ret; + + ret = gb_operation_sync(pwmc->connection, GB_PWM_TYPE_DEACTIVATE, + &request, sizeof(request), NULL, 0); + + gbphy_runtime_put_autosuspend(gbphy_dev); + + return ret; +} + +static int gb_pwm_config_operation(struct gb_pwm_chip *pwmc, + u8 which, u32 duty, u32 period) +{ + struct gb_pwm_config_request request; + struct gbphy_device *gbphy_dev; + int ret; + + if (which > pwmc->pwm_max) + return -EINVAL; + + request.which = which; + request.duty = cpu_to_le32(duty); + request.period = cpu_to_le32(period); + + gbphy_dev = to_gbphy_dev(pwmc->chip.dev); + ret = gbphy_runtime_get_sync(gbphy_dev); + if (ret) + return ret; + + ret = gb_operation_sync(pwmc->connection, GB_PWM_TYPE_CONFIG, + &request, sizeof(request), NULL, 0); + + gbphy_runtime_put_autosuspend(gbphy_dev); + + return ret; +} + +static int gb_pwm_set_polarity_operation(struct gb_pwm_chip *pwmc, + u8 which, u8 polarity) +{ + struct gb_pwm_polarity_request request; + struct gbphy_device *gbphy_dev; + int ret; + + if (which > pwmc->pwm_max) + return -EINVAL; + + request.which = which; + request.polarity = polarity; + + gbphy_dev = to_gbphy_dev(pwmc->chip.dev); + ret = gbphy_runtime_get_sync(gbphy_dev); + if (ret) + return ret; + + ret = gb_operation_sync(pwmc->connection, GB_PWM_TYPE_POLARITY, + &request, sizeof(request), NULL, 0); + + gbphy_runtime_put_autosuspend(gbphy_dev); + + return ret; +} + +static int gb_pwm_enable_operation(struct gb_pwm_chip *pwmc, + u8 which) +{ + struct gb_pwm_enable_request request; + struct gbphy_device *gbphy_dev; + int ret; + + if (which > pwmc->pwm_max) + return -EINVAL; + + request.which = which; + + gbphy_dev = to_gbphy_dev(pwmc->chip.dev); + ret = gbphy_runtime_get_sync(gbphy_dev); + if (ret) + return ret; + + ret = gb_operation_sync(pwmc->connection, GB_PWM_TYPE_ENABLE, + &request, sizeof(request), NULL, 0); + if (ret) + gbphy_runtime_put_autosuspend(gbphy_dev); + + return ret; +} + +static int gb_pwm_disable_operation(struct gb_pwm_chip *pwmc, + u8 which) +{ + struct gb_pwm_disable_request request; + struct gbphy_device *gbphy_dev; + int ret; + + if (which > pwmc->pwm_max) + return -EINVAL; + + request.which = which; + + ret = gb_operation_sync(pwmc->connection, GB_PWM_TYPE_DISABLE, + &request, sizeof(request), NULL, 0); + + gbphy_dev = to_gbphy_dev(pwmc->chip.dev); + gbphy_runtime_put_autosuspend(gbphy_dev); + + return ret; +} + +static int gb_pwm_request(struct pwm_chip *chip, struct pwm_device *pwm) +{ + struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip); + + return gb_pwm_activate_operation(pwmc, pwm->hwpwm); +}; + +static void gb_pwm_free(struct pwm_chip *chip, struct pwm_device *pwm) +{ + struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip); + + if (pwm_is_enabled(pwm)) + dev_warn(chip->dev, "freeing PWM device without disabling\n"); + + gb_pwm_deactivate_operation(pwmc, pwm->hwpwm); +} + +static int gb_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, + const struct pwm_state *state) +{ + int err; + bool enabled = pwm->state.enabled; + u64 period = state->period; + u64 duty_cycle = state->duty_cycle; + struct gb_pwm_chip *pwmc = pwm_chip_to_gb_pwm_chip(chip); + + /* Set polarity */ + if (state->polarity != pwm->state.polarity) { + if (enabled) { + gb_pwm_disable_operation(pwmc, pwm->hwpwm); + enabled = false; + } + err = gb_pwm_set_polarity_operation(pwmc, pwm->hwpwm, state->polarity); + if (err) + return err; + } + + if (!state->enabled) { + if (enabled) + gb_pwm_disable_operation(pwmc, pwm->hwpwm); + return 0; + } + + /* + * Set period and duty cycle + * + * PWM privodes 64-bit period and duty_cycle, but greybus only accepts + * 32-bit, so their values have to be limited to U32_MAX. + */ + if (period > U32_MAX) + period = U32_MAX; + + if (duty_cycle > period) + duty_cycle = period; + + err = gb_pwm_config_operation(pwmc, pwm->hwpwm, duty_cycle, period); + if (err) + return err; + + /* enable/disable */ + if (!enabled) + return gb_pwm_enable_operation(pwmc, pwm->hwpwm); + + return 0; +} + +static const struct pwm_ops gb_pwm_ops = { + .request = gb_pwm_request, + .free = gb_pwm_free, + .apply = gb_pwm_apply, + .owner = THIS_MODULE, +}; + +static int gb_pwm_probe(struct gbphy_device *gbphy_dev, + const struct gbphy_device_id *id) +{ + struct gb_connection *connection; + struct gb_pwm_chip *pwmc; + struct pwm_chip *pwm; + int ret; + + pwmc = kzalloc(sizeof(*pwmc), GFP_KERNEL); + if (!pwmc) + return -ENOMEM; + + connection = gb_connection_create(gbphy_dev->bundle, + le16_to_cpu(gbphy_dev->cport_desc->id), + NULL); + if (IS_ERR(connection)) { + ret = PTR_ERR(connection); + goto exit_pwmc_free; + } + + pwmc->connection = connection; + gb_connection_set_data(connection, pwmc); + gb_gbphy_set_data(gbphy_dev, pwmc); + + ret = gb_connection_enable(connection); + if (ret) + goto exit_connection_destroy; + + /* Query number of pwms present */ + ret = gb_pwm_count_operation(pwmc); + if (ret) + goto exit_connection_disable; + + pwm = &pwmc->chip; + + pwm->dev = &gbphy_dev->dev; + pwm->ops = &gb_pwm_ops; + pwm->npwm = pwmc->pwm_max + 1; + + ret = pwmchip_add(pwm); + if (ret) { + dev_err(&gbphy_dev->dev, + "failed to register PWM: %d\n", ret); + goto exit_connection_disable; + } + + gbphy_runtime_put_autosuspend(gbphy_dev); + return 0; + +exit_connection_disable: + gb_connection_disable(connection); +exit_connection_destroy: + gb_connection_destroy(connection); +exit_pwmc_free: + kfree(pwmc); + return ret; +} + +static void gb_pwm_remove(struct gbphy_device *gbphy_dev) +{ + struct gb_pwm_chip *pwmc = gb_gbphy_get_data(gbphy_dev); + struct gb_connection *connection = pwmc->connection; + int ret; + + ret = gbphy_runtime_get_sync(gbphy_dev); + if (ret) + gbphy_runtime_get_noresume(gbphy_dev); + + pwmchip_remove(&pwmc->chip); + gb_connection_disable(connection); + gb_connection_destroy(connection); + kfree(pwmc); +} + +static const struct gbphy_device_id gb_pwm_id_table[] = { + { GBPHY_PROTOCOL(GREYBUS_PROTOCOL_PWM) }, + { }, +}; +MODULE_DEVICE_TABLE(gbphy, gb_pwm_id_table); + +static struct gbphy_driver pwm_driver = { + .name = "pwm", + .probe = gb_pwm_probe, + .remove = gb_pwm_remove, + .id_table = gb_pwm_id_table, +}; + +module_gbphy_driver(pwm_driver); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3