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/rtc/rtc-ti-k3.c | 662 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 662 insertions(+) create mode 100644 drivers/rtc/rtc-ti-k3.c (limited to 'drivers/rtc/rtc-ti-k3.c') diff --git a/drivers/rtc/rtc-ti-k3.c b/drivers/rtc/rtc-ti-k3.c new file mode 100644 index 000000000..ba23163cc --- /dev/null +++ b/drivers/rtc/rtc-ti-k3.c @@ -0,0 +1,662 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Texas Instruments K3 RTC driver + * + * Copyright (C) 2021-2022 Texas Instruments Incorporated - https://www.ti.com/ + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* Registers */ +#define REG_K3RTC_S_CNT_LSW 0x08 +#define REG_K3RTC_S_CNT_MSW 0x0c +#define REG_K3RTC_COMP 0x10 +#define REG_K3RTC_ON_OFF_S_CNT_LSW 0x20 +#define REG_K3RTC_ON_OFF_S_CNT_MSW 0x24 +#define REG_K3RTC_SCRATCH0 0x30 +#define REG_K3RTC_SCRATCH7 0x4c +#define REG_K3RTC_GENERAL_CTL 0x50 +#define REG_K3RTC_IRQSTATUS_RAW_SYS 0x54 +#define REG_K3RTC_IRQSTATUS_SYS 0x58 +#define REG_K3RTC_IRQENABLE_SET_SYS 0x5c +#define REG_K3RTC_IRQENABLE_CLR_SYS 0x60 +#define REG_K3RTC_SYNCPEND 0x68 +#define REG_K3RTC_KICK0 0x70 +#define REG_K3RTC_KICK1 0x74 + +/* Freeze when lsw is read and unfreeze when msw is read */ +#define K3RTC_CNT_FMODE_S_CNT_VALUE (0x2 << 24) + +/* Magic values for lock/unlock */ +#define K3RTC_KICK0_UNLOCK_VALUE 0x83e70b13 +#define K3RTC_KICK1_UNLOCK_VALUE 0x95a4f1e0 + +/* Multiplier for ppb conversions */ +#define K3RTC_PPB_MULT (1000000000LL) +/* Min and max values supported with 'offset' interface (swapped sign) */ +#define K3RTC_MIN_OFFSET (-277761) +#define K3RTC_MAX_OFFSET (277778) + +static const struct regmap_config ti_k3_rtc_regmap_config = { + .name = "peripheral-registers", + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, + .max_register = REG_K3RTC_KICK1, +}; + +enum ti_k3_rtc_fields { + K3RTC_KICK0, + K3RTC_KICK1, + K3RTC_S_CNT_LSW, + K3RTC_S_CNT_MSW, + K3RTC_O32K_OSC_DEP_EN, + K3RTC_UNLOCK, + K3RTC_CNT_FMODE, + K3RTC_PEND, + K3RTC_RELOAD_FROM_BBD, + K3RTC_COMP, + + K3RTC_ALM_S_CNT_LSW, + K3RTC_ALM_S_CNT_MSW, + K3RTC_IRQ_STATUS_RAW, + K3RTC_IRQ_STATUS, + K3RTC_IRQ_ENABLE_SET, + K3RTC_IRQ_ENABLE_CLR, + + K3RTC_IRQ_STATUS_ALT, + K3RTC_IRQ_ENABLE_CLR_ALT, + + K3_RTC_MAX_FIELDS +}; + +static const struct reg_field ti_rtc_reg_fields[] = { + [K3RTC_KICK0] = REG_FIELD(REG_K3RTC_KICK0, 0, 31), + [K3RTC_KICK1] = REG_FIELD(REG_K3RTC_KICK1, 0, 31), + [K3RTC_S_CNT_LSW] = REG_FIELD(REG_K3RTC_S_CNT_LSW, 0, 31), + [K3RTC_S_CNT_MSW] = REG_FIELD(REG_K3RTC_S_CNT_MSW, 0, 15), + [K3RTC_O32K_OSC_DEP_EN] = REG_FIELD(REG_K3RTC_GENERAL_CTL, 21, 21), + [K3RTC_UNLOCK] = REG_FIELD(REG_K3RTC_GENERAL_CTL, 23, 23), + [K3RTC_CNT_FMODE] = REG_FIELD(REG_K3RTC_GENERAL_CTL, 24, 25), + [K3RTC_PEND] = REG_FIELD(REG_K3RTC_SYNCPEND, 0, 1), + [K3RTC_RELOAD_FROM_BBD] = REG_FIELD(REG_K3RTC_SYNCPEND, 31, 31), + [K3RTC_COMP] = REG_FIELD(REG_K3RTC_COMP, 0, 31), + + /* We use on to off as alarm trigger */ + [K3RTC_ALM_S_CNT_LSW] = REG_FIELD(REG_K3RTC_ON_OFF_S_CNT_LSW, 0, 31), + [K3RTC_ALM_S_CNT_MSW] = REG_FIELD(REG_K3RTC_ON_OFF_S_CNT_MSW, 0, 15), + [K3RTC_IRQ_STATUS_RAW] = REG_FIELD(REG_K3RTC_IRQSTATUS_RAW_SYS, 0, 0), + [K3RTC_IRQ_STATUS] = REG_FIELD(REG_K3RTC_IRQSTATUS_SYS, 0, 0), + [K3RTC_IRQ_ENABLE_SET] = REG_FIELD(REG_K3RTC_IRQENABLE_SET_SYS, 0, 0), + [K3RTC_IRQ_ENABLE_CLR] = REG_FIELD(REG_K3RTC_IRQENABLE_CLR_SYS, 0, 0), + /* Off to on is alternate */ + [K3RTC_IRQ_STATUS_ALT] = REG_FIELD(REG_K3RTC_IRQSTATUS_SYS, 1, 1), + [K3RTC_IRQ_ENABLE_CLR_ALT] = REG_FIELD(REG_K3RTC_IRQENABLE_CLR_SYS, 1, 1), +}; + +/** + * struct ti_k3_rtc - Private data for ti-k3-rtc + * @irq: IRQ + * @sync_timeout_us: data sync timeout period in uSec + * @rate_32k: 32k clock rate in Hz + * @rtc_dev: rtc device + * @regmap: rtc mmio regmap + * @r_fields: rtc register fields + */ +struct ti_k3_rtc { + unsigned int irq; + u32 sync_timeout_us; + unsigned long rate_32k; + struct rtc_device *rtc_dev; + struct regmap *regmap; + struct regmap_field *r_fields[K3_RTC_MAX_FIELDS]; +}; + +static int k3rtc_field_read(struct ti_k3_rtc *priv, enum ti_k3_rtc_fields f) +{ + int ret; + int val; + + ret = regmap_field_read(priv->r_fields[f], &val); + /* + * We shouldn't be seeing regmap fail on us for mmio reads + * This is possible if clock context fails, but that isn't the case for us + */ + if (WARN_ON_ONCE(ret)) + return ret; + return val; +} + +static void k3rtc_field_write(struct ti_k3_rtc *priv, enum ti_k3_rtc_fields f, u32 val) +{ + regmap_field_write(priv->r_fields[f], val); +} + +/** + * k3rtc_fence - Ensure a register sync took place between the two domains + * @priv: pointer to priv data + * + * Return: 0 if the sync took place, else returns -ETIMEDOUT + */ +static int k3rtc_fence(struct ti_k3_rtc *priv) +{ + int ret; + + ret = regmap_field_read_poll_timeout(priv->r_fields[K3RTC_PEND], ret, + !ret, 2, priv->sync_timeout_us); + + return ret; +} + +static inline int k3rtc_check_unlocked(struct ti_k3_rtc *priv) +{ + int ret; + + ret = k3rtc_field_read(priv, K3RTC_UNLOCK); + if (ret < 0) + return ret; + + return (ret) ? 0 : 1; +} + +static int k3rtc_unlock_rtc(struct ti_k3_rtc *priv) +{ + int ret; + + ret = k3rtc_check_unlocked(priv); + if (!ret) + return ret; + + k3rtc_field_write(priv, K3RTC_KICK0, K3RTC_KICK0_UNLOCK_VALUE); + k3rtc_field_write(priv, K3RTC_KICK1, K3RTC_KICK1_UNLOCK_VALUE); + + /* Skip fence since we are going to check the unlock bit as fence */ + ret = regmap_field_read_poll_timeout(priv->r_fields[K3RTC_UNLOCK], ret, + ret, 2, priv->sync_timeout_us); + + return ret; +} + +/* + * This is the list of SoCs affected by TI's i2327 errata causing the RTC + * state-machine to break if not unlocked fast enough during boot. These + * SoCs must have the bootloader unlock this device very early in the + * boot-flow before we (Linux) can use this device. + */ +static const struct soc_device_attribute has_erratum_i2327[] = { + { .family = "AM62X", .revision = "SR1.0" }, + { /* sentinel */ } +}; + +static int k3rtc_configure(struct device *dev) +{ + int ret; + struct ti_k3_rtc *priv = dev_get_drvdata(dev); + + /* + * HWBUG: The compare state machine is broken if the RTC module + * is NOT unlocked in under one second of boot - which is pretty long + * time from the perspective of Linux driver (module load, u-boot + * shell all can take much longer than this. + * + * In such occurrence, it is assumed that the RTC module is unusable + */ + if (soc_device_match(has_erratum_i2327)) { + ret = k3rtc_check_unlocked(priv); + /* If there is an error OR if we are locked, return error */ + if (ret) { + dev_err(dev, + HW_ERR "Erratum i2327 unlock QUIRK! Cannot operate!!\n"); + return -EFAULT; + } + } else { + /* May need to explicitly unlock first time */ + ret = k3rtc_unlock_rtc(priv); + if (ret) { + dev_err(dev, "Failed to unlock(%d)!\n", ret); + return ret; + } + } + + /* Enable Shadow register sync on 32k clock boundary */ + k3rtc_field_write(priv, K3RTC_O32K_OSC_DEP_EN, 0x1); + + /* + * Wait at least clock sync time before proceeding further programming. + * This ensures that the 32k based sync is active. + */ + usleep_range(priv->sync_timeout_us, priv->sync_timeout_us + 5); + + /* We need to ensure fence here to make sure sync here */ + ret = k3rtc_fence(priv); + if (ret) { + dev_err(dev, + "Failed fence osc_dep enable(%d) - is 32k clk working?!\n", ret); + return ret; + } + + /* + * FMODE setting: Reading lower seconds will freeze value on higher + * seconds. This also implies that we must *ALWAYS* read lower seconds + * prior to reading higher seconds + */ + k3rtc_field_write(priv, K3RTC_CNT_FMODE, K3RTC_CNT_FMODE_S_CNT_VALUE); + + /* Clear any spurious IRQ sources if any */ + k3rtc_field_write(priv, K3RTC_IRQ_STATUS_ALT, 0x1); + k3rtc_field_write(priv, K3RTC_IRQ_STATUS, 0x1); + /* Disable all IRQs */ + k3rtc_field_write(priv, K3RTC_IRQ_ENABLE_CLR_ALT, 0x1); + k3rtc_field_write(priv, K3RTC_IRQ_ENABLE_CLR, 0x1); + + /* And.. Let us Sync the writes in */ + return k3rtc_fence(priv); +} + +static int ti_k3_rtc_read_time(struct device *dev, struct rtc_time *tm) +{ + struct ti_k3_rtc *priv = dev_get_drvdata(dev); + u32 seconds_lo, seconds_hi; + + seconds_lo = k3rtc_field_read(priv, K3RTC_S_CNT_LSW); + seconds_hi = k3rtc_field_read(priv, K3RTC_S_CNT_MSW); + + rtc_time64_to_tm((((time64_t)seconds_hi) << 32) | (time64_t)seconds_lo, tm); + + return 0; +} + +static int ti_k3_rtc_set_time(struct device *dev, struct rtc_time *tm) +{ + struct ti_k3_rtc *priv = dev_get_drvdata(dev); + time64_t seconds; + + seconds = rtc_tm_to_time64(tm); + + /* + * Read operation on LSW will freeze the RTC, so to update + * the time, we cannot use field operations. Just write since the + * reserved bits are ignored. + */ + regmap_write(priv->regmap, REG_K3RTC_S_CNT_LSW, seconds); + regmap_write(priv->regmap, REG_K3RTC_S_CNT_MSW, seconds >> 32); + + return k3rtc_fence(priv); +} + +static int ti_k3_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled) +{ + struct ti_k3_rtc *priv = dev_get_drvdata(dev); + u32 reg; + u32 offset = enabled ? K3RTC_IRQ_ENABLE_SET : K3RTC_IRQ_ENABLE_CLR; + + reg = k3rtc_field_read(priv, K3RTC_IRQ_ENABLE_SET); + if ((enabled && reg) || (!enabled && !reg)) + return 0; + + k3rtc_field_write(priv, offset, 0x1); + + /* + * Ensure the write sync is through - NOTE: it should be OK to have + * ISR to fire as we are checking sync (which should be done in a 32k + * cycle or so). + */ + return k3rtc_fence(priv); +} + +static int ti_k3_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm) +{ + struct ti_k3_rtc *priv = dev_get_drvdata(dev); + u32 seconds_lo, seconds_hi; + + seconds_lo = k3rtc_field_read(priv, K3RTC_ALM_S_CNT_LSW); + seconds_hi = k3rtc_field_read(priv, K3RTC_ALM_S_CNT_MSW); + + rtc_time64_to_tm((((time64_t)seconds_hi) << 32) | (time64_t)seconds_lo, &alarm->time); + + alarm->enabled = k3rtc_field_read(priv, K3RTC_IRQ_ENABLE_SET); + + return 0; +} + +static int ti_k3_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm) +{ + struct ti_k3_rtc *priv = dev_get_drvdata(dev); + time64_t seconds; + int ret; + + seconds = rtc_tm_to_time64(&alarm->time); + + k3rtc_field_write(priv, K3RTC_ALM_S_CNT_LSW, seconds); + k3rtc_field_write(priv, K3RTC_ALM_S_CNT_MSW, (seconds >> 32)); + + /* Make sure the alarm time is synced in */ + ret = k3rtc_fence(priv); + if (ret) { + dev_err(dev, "Failed to fence(%d)! Potential config issue?\n", ret); + return ret; + } + + /* Alarm IRQ enable will do a sync */ + return ti_k3_rtc_alarm_irq_enable(dev, alarm->enabled); +} + +static int ti_k3_rtc_read_offset(struct device *dev, long *offset) +{ + struct ti_k3_rtc *priv = dev_get_drvdata(dev); + u32 ticks_per_hr = priv->rate_32k * 3600; + int comp; + s64 tmp; + + comp = k3rtc_field_read(priv, K3RTC_COMP); + + /* Convert from RTC calibration register format to ppb format */ + tmp = comp * (s64)K3RTC_PPB_MULT; + if (tmp < 0) + tmp -= ticks_per_hr / 2LL; + else + tmp += ticks_per_hr / 2LL; + tmp = div_s64(tmp, ticks_per_hr); + + /* Offset value operates in negative way, so swap sign */ + *offset = (long)-tmp; + + return 0; +} + +static int ti_k3_rtc_set_offset(struct device *dev, long offset) +{ + struct ti_k3_rtc *priv = dev_get_drvdata(dev); + u32 ticks_per_hr = priv->rate_32k * 3600; + int comp; + s64 tmp; + + /* Make sure offset value is within supported range */ + if (offset < K3RTC_MIN_OFFSET || offset > K3RTC_MAX_OFFSET) + return -ERANGE; + + /* Convert from ppb format to RTC calibration register format */ + tmp = offset * (s64)ticks_per_hr; + if (tmp < 0) + tmp -= K3RTC_PPB_MULT / 2LL; + else + tmp += K3RTC_PPB_MULT / 2LL; + tmp = div_s64(tmp, K3RTC_PPB_MULT); + + /* Offset value operates in negative way, so swap sign */ + comp = (int)-tmp; + + k3rtc_field_write(priv, K3RTC_COMP, comp); + + return k3rtc_fence(priv); +} + +static irqreturn_t ti_k3_rtc_interrupt(s32 irq, void *dev_id) +{ + struct device *dev = dev_id; + struct ti_k3_rtc *priv = dev_get_drvdata(dev); + u32 reg; + int ret; + + /* + * IRQ assertion can be very fast, however, the IRQ Status clear + * de-assert depends on 32k clock edge in the 32k domain + * If we clear the status prior to the first 32k clock edge, + * the status bit is cleared, but the IRQ stays re-asserted. + * + * To prevent this condition, we need to wait for clock sync time. + * We can either do that by polling the 32k observability signal for + * a toggle OR we could just sleep and let the processor do other + * stuff. + */ + usleep_range(priv->sync_timeout_us, priv->sync_timeout_us + 2); + + /* Lets make sure that this is a valid interrupt */ + reg = k3rtc_field_read(priv, K3RTC_IRQ_STATUS); + + if (!reg) { + u32 raw = k3rtc_field_read(priv, K3RTC_IRQ_STATUS_RAW); + + dev_err(dev, + HW_ERR + "Erratum i2327/IRQ trig: status: 0x%08x / 0x%08x\n", reg, raw); + return IRQ_NONE; + } + + /* + * Write 1 to clear status reg + * We cannot use a field operation here due to a potential race between + * 32k domain and vbus domain. + */ + regmap_write(priv->regmap, REG_K3RTC_IRQSTATUS_SYS, 0x1); + + /* Sync the write in */ + ret = k3rtc_fence(priv); + if (ret) { + dev_err(dev, "Failed to fence irq status clr(%d)!\n", ret); + return IRQ_NONE; + } + + /* + * Force the 32k status to be reloaded back in to ensure status is + * reflected back correctly. + */ + k3rtc_field_write(priv, K3RTC_RELOAD_FROM_BBD, 0x1); + + /* Ensure the write sync is through */ + ret = k3rtc_fence(priv); + if (ret) { + dev_err(dev, "Failed to fence reload from bbd(%d)!\n", ret); + return IRQ_NONE; + } + + /* Now we ensure that the status bit is cleared */ + ret = regmap_field_read_poll_timeout(priv->r_fields[K3RTC_IRQ_STATUS], + ret, !ret, 2, priv->sync_timeout_us); + if (ret) { + dev_err(dev, "Time out waiting for status clear\n"); + return IRQ_NONE; + } + + /* Notify RTC core on event */ + rtc_update_irq(priv->rtc_dev, 1, RTC_IRQF | RTC_AF); + + return IRQ_HANDLED; +} + +static const struct rtc_class_ops ti_k3_rtc_ops = { + .read_time = ti_k3_rtc_read_time, + .set_time = ti_k3_rtc_set_time, + .read_alarm = ti_k3_rtc_read_alarm, + .set_alarm = ti_k3_rtc_set_alarm, + .read_offset = ti_k3_rtc_read_offset, + .set_offset = ti_k3_rtc_set_offset, + .alarm_irq_enable = ti_k3_rtc_alarm_irq_enable, +}; + +static int ti_k3_rtc_scratch_read(void *priv_data, unsigned int offset, + void *val, size_t bytes) +{ + struct ti_k3_rtc *priv = (struct ti_k3_rtc *)priv_data; + + return regmap_bulk_read(priv->regmap, REG_K3RTC_SCRATCH0 + offset, val, bytes / 4); +} + +static int ti_k3_rtc_scratch_write(void *priv_data, unsigned int offset, + void *val, size_t bytes) +{ + struct ti_k3_rtc *priv = (struct ti_k3_rtc *)priv_data; + int ret; + + ret = regmap_bulk_write(priv->regmap, REG_K3RTC_SCRATCH0 + offset, val, bytes / 4); + if (ret) + return ret; + + return k3rtc_fence(priv); +} + +static struct nvmem_config ti_k3_rtc_nvmem_config = { + .name = "ti_k3_rtc_scratch", + .word_size = 4, + .stride = 4, + .size = REG_K3RTC_SCRATCH7 - REG_K3RTC_SCRATCH0 + 4, + .reg_read = ti_k3_rtc_scratch_read, + .reg_write = ti_k3_rtc_scratch_write, +}; + +static int k3rtc_get_32kclk(struct device *dev, struct ti_k3_rtc *priv) +{ + struct clk *clk; + + clk = devm_clk_get_enabled(dev, "osc32k"); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + priv->rate_32k = clk_get_rate(clk); + + /* Make sure we are exact 32k clock. Else, try to compensate delay */ + if (priv->rate_32k != 32768) + dev_warn(dev, "Clock rate %ld is not 32768! Could misbehave!\n", + priv->rate_32k); + + /* + * Sync timeout should be two 32k clk sync cycles = ~61uS. We double + * it to comprehend intermediate bus segment and cpu frequency + * deltas + */ + priv->sync_timeout_us = (u32)(DIV_ROUND_UP_ULL(1000000, priv->rate_32k) * 4); + + return 0; +} + +static int k3rtc_get_vbusclk(struct device *dev, struct ti_k3_rtc *priv) +{ + struct clk *clk; + + /* Note: VBUS isn't a context clock, it is needed for hardware operation */ + clk = devm_clk_get_enabled(dev, "vbus"); + if (IS_ERR(clk)) + return PTR_ERR(clk); + + return 0; +} + +static int ti_k3_rtc_probe(struct platform_device *pdev) +{ + struct device *dev = &pdev->dev; + struct ti_k3_rtc *priv; + void __iomem *rtc_base; + int ret; + + priv = devm_kzalloc(dev, sizeof(struct ti_k3_rtc), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + rtc_base = devm_platform_ioremap_resource(pdev, 0); + if (IS_ERR(rtc_base)) + return PTR_ERR(rtc_base); + + priv->regmap = devm_regmap_init_mmio(dev, rtc_base, &ti_k3_rtc_regmap_config); + if (IS_ERR(priv->regmap)) + return PTR_ERR(priv->regmap); + + ret = devm_regmap_field_bulk_alloc(dev, priv->regmap, priv->r_fields, + ti_rtc_reg_fields, K3_RTC_MAX_FIELDS); + if (ret) + return ret; + + ret = k3rtc_get_32kclk(dev, priv); + if (ret) + return ret; + ret = k3rtc_get_vbusclk(dev, priv); + if (ret) + return ret; + + ret = platform_get_irq(pdev, 0); + if (ret < 0) + return ret; + priv->irq = (unsigned int)ret; + + priv->rtc_dev = devm_rtc_allocate_device(dev); + if (IS_ERR(priv->rtc_dev)) + return PTR_ERR(priv->rtc_dev); + + priv->rtc_dev->ops = &ti_k3_rtc_ops; + priv->rtc_dev->range_max = (1ULL << 48) - 1; /* 48Bit seconds */ + ti_k3_rtc_nvmem_config.priv = priv; + + ret = devm_request_threaded_irq(dev, priv->irq, NULL, + ti_k3_rtc_interrupt, + IRQF_TRIGGER_HIGH | IRQF_ONESHOT, + dev_name(dev), dev); + if (ret) { + dev_err(dev, "Could not request IRQ: %d\n", ret); + return ret; + } + + platform_set_drvdata(pdev, priv); + + ret = k3rtc_configure(dev); + if (ret) + return ret; + + if (device_property_present(dev, "wakeup-source")) + device_init_wakeup(dev, true); + else + device_set_wakeup_capable(dev, true); + + ret = devm_rtc_register_device(priv->rtc_dev); + if (ret) + return ret; + + return devm_rtc_nvmem_register(priv->rtc_dev, &ti_k3_rtc_nvmem_config); +} + +static const struct of_device_id ti_k3_rtc_of_match_table[] = { + {.compatible = "ti,am62-rtc" }, + {} +}; +MODULE_DEVICE_TABLE(of, ti_k3_rtc_of_match_table); + +static int __maybe_unused ti_k3_rtc_suspend(struct device *dev) +{ + struct ti_k3_rtc *priv = dev_get_drvdata(dev); + + if (device_may_wakeup(dev)) + enable_irq_wake(priv->irq); + return 0; +} + +static int __maybe_unused ti_k3_rtc_resume(struct device *dev) +{ + struct ti_k3_rtc *priv = dev_get_drvdata(dev); + + if (device_may_wakeup(dev)) + disable_irq_wake(priv->irq); + return 0; +} + +static SIMPLE_DEV_PM_OPS(ti_k3_rtc_pm_ops, ti_k3_rtc_suspend, ti_k3_rtc_resume); + +static struct platform_driver ti_k3_rtc_driver = { + .probe = ti_k3_rtc_probe, + .driver = { + .name = "rtc-ti-k3", + .of_match_table = ti_k3_rtc_of_match_table, + .pm = &ti_k3_rtc_pm_ops, + }, +}; +module_platform_driver(ti_k3_rtc_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("TI K3 RTC driver"); +MODULE_AUTHOR("Nishanth Menon"); -- cgit v1.2.3