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/cpufreq/vexpress-spc-cpufreq.c | 579 +++++++++++++++++++++++++++++++++ 1 file changed, 579 insertions(+) create mode 100644 drivers/cpufreq/vexpress-spc-cpufreq.c (limited to 'drivers/cpufreq/vexpress-spc-cpufreq.c') diff --git a/drivers/cpufreq/vexpress-spc-cpufreq.c b/drivers/cpufreq/vexpress-spc-cpufreq.c new file mode 100644 index 000000000..d295f405c --- /dev/null +++ b/drivers/cpufreq/vexpress-spc-cpufreq.c @@ -0,0 +1,579 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Versatile Express SPC CPUFreq Interface driver + * + * Copyright (C) 2013 - 2019 ARM Ltd. + * Sudeep Holla + * + * Copyright (C) 2013 Linaro. + * Viresh Kumar + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* Currently we support only two clusters */ +#define A15_CLUSTER 0 +#define A7_CLUSTER 1 +#define MAX_CLUSTERS 2 + +#ifdef CONFIG_BL_SWITCHER +#include +static bool bL_switching_enabled; +#define is_bL_switching_enabled() bL_switching_enabled +#define set_switching_enabled(x) (bL_switching_enabled = (x)) +#else +#define is_bL_switching_enabled() false +#define set_switching_enabled(x) do { } while (0) +#define bL_switch_request(...) do { } while (0) +#define bL_switcher_put_enabled() do { } while (0) +#define bL_switcher_get_enabled() do { } while (0) +#endif + +#define ACTUAL_FREQ(cluster, freq) ((cluster == A7_CLUSTER) ? freq << 1 : freq) +#define VIRT_FREQ(cluster, freq) ((cluster == A7_CLUSTER) ? freq >> 1 : freq) + +static struct clk *clk[MAX_CLUSTERS]; +static struct cpufreq_frequency_table *freq_table[MAX_CLUSTERS + 1]; +static atomic_t cluster_usage[MAX_CLUSTERS + 1]; + +static unsigned int clk_big_min; /* (Big) clock frequencies */ +static unsigned int clk_little_max; /* Maximum clock frequency (Little) */ + +static DEFINE_PER_CPU(unsigned int, physical_cluster); +static DEFINE_PER_CPU(unsigned int, cpu_last_req_freq); + +static struct mutex cluster_lock[MAX_CLUSTERS]; + +static inline int raw_cpu_to_cluster(int cpu) +{ + return topology_physical_package_id(cpu); +} + +static inline int cpu_to_cluster(int cpu) +{ + return is_bL_switching_enabled() ? + MAX_CLUSTERS : raw_cpu_to_cluster(cpu); +} + +static unsigned int find_cluster_maxfreq(int cluster) +{ + int j; + u32 max_freq = 0, cpu_freq; + + for_each_online_cpu(j) { + cpu_freq = per_cpu(cpu_last_req_freq, j); + + if (cluster == per_cpu(physical_cluster, j) && + max_freq < cpu_freq) + max_freq = cpu_freq; + } + + return max_freq; +} + +static unsigned int clk_get_cpu_rate(unsigned int cpu) +{ + u32 cur_cluster = per_cpu(physical_cluster, cpu); + u32 rate = clk_get_rate(clk[cur_cluster]) / 1000; + + /* For switcher we use virtual A7 clock rates */ + if (is_bL_switching_enabled()) + rate = VIRT_FREQ(cur_cluster, rate); + + return rate; +} + +static unsigned int ve_spc_cpufreq_get_rate(unsigned int cpu) +{ + if (is_bL_switching_enabled()) + return per_cpu(cpu_last_req_freq, cpu); + else + return clk_get_cpu_rate(cpu); +} + +static unsigned int +ve_spc_cpufreq_set_rate(u32 cpu, u32 old_cluster, u32 new_cluster, u32 rate) +{ + u32 new_rate, prev_rate; + int ret; + bool bLs = is_bL_switching_enabled(); + + mutex_lock(&cluster_lock[new_cluster]); + + if (bLs) { + prev_rate = per_cpu(cpu_last_req_freq, cpu); + per_cpu(cpu_last_req_freq, cpu) = rate; + per_cpu(physical_cluster, cpu) = new_cluster; + + new_rate = find_cluster_maxfreq(new_cluster); + new_rate = ACTUAL_FREQ(new_cluster, new_rate); + } else { + new_rate = rate; + } + + ret = clk_set_rate(clk[new_cluster], new_rate * 1000); + if (!ret) { + /* + * FIXME: clk_set_rate hasn't returned an error here however it + * may be that clk_change_rate failed due to hardware or + * firmware issues and wasn't able to report that due to the + * current design of the clk core layer. To work around this + * problem we will read back the clock rate and check it is + * correct. This needs to be removed once clk core is fixed. + */ + if (clk_get_rate(clk[new_cluster]) != new_rate * 1000) + ret = -EIO; + } + + if (WARN_ON(ret)) { + if (bLs) { + per_cpu(cpu_last_req_freq, cpu) = prev_rate; + per_cpu(physical_cluster, cpu) = old_cluster; + } + + mutex_unlock(&cluster_lock[new_cluster]); + + return ret; + } + + mutex_unlock(&cluster_lock[new_cluster]); + + /* Recalc freq for old cluster when switching clusters */ + if (old_cluster != new_cluster) { + /* Switch cluster */ + bL_switch_request(cpu, new_cluster); + + mutex_lock(&cluster_lock[old_cluster]); + + /* Set freq of old cluster if there are cpus left on it */ + new_rate = find_cluster_maxfreq(old_cluster); + new_rate = ACTUAL_FREQ(old_cluster, new_rate); + + if (new_rate && + clk_set_rate(clk[old_cluster], new_rate * 1000)) { + pr_err("%s: clk_set_rate failed: %d, old cluster: %d\n", + __func__, ret, old_cluster); + } + mutex_unlock(&cluster_lock[old_cluster]); + } + + return 0; +} + +/* Set clock frequency */ +static int ve_spc_cpufreq_set_target(struct cpufreq_policy *policy, + unsigned int index) +{ + u32 cpu = policy->cpu, cur_cluster, new_cluster, actual_cluster; + unsigned int freqs_new; + + cur_cluster = cpu_to_cluster(cpu); + new_cluster = actual_cluster = per_cpu(physical_cluster, cpu); + + freqs_new = freq_table[cur_cluster][index].frequency; + + if (is_bL_switching_enabled()) { + if (actual_cluster == A15_CLUSTER && freqs_new < clk_big_min) + new_cluster = A7_CLUSTER; + else if (actual_cluster == A7_CLUSTER && + freqs_new > clk_little_max) + new_cluster = A15_CLUSTER; + } + + return ve_spc_cpufreq_set_rate(cpu, actual_cluster, new_cluster, + freqs_new); +} + +static inline u32 get_table_count(struct cpufreq_frequency_table *table) +{ + int count; + + for (count = 0; table[count].frequency != CPUFREQ_TABLE_END; count++) + ; + + return count; +} + +/* get the minimum frequency in the cpufreq_frequency_table */ +static inline u32 get_table_min(struct cpufreq_frequency_table *table) +{ + struct cpufreq_frequency_table *pos; + u32 min_freq = ~0; + + cpufreq_for_each_entry(pos, table) + if (pos->frequency < min_freq) + min_freq = pos->frequency; + return min_freq; +} + +/* get the maximum frequency in the cpufreq_frequency_table */ +static inline u32 get_table_max(struct cpufreq_frequency_table *table) +{ + struct cpufreq_frequency_table *pos; + u32 max_freq = 0; + + cpufreq_for_each_entry(pos, table) + if (pos->frequency > max_freq) + max_freq = pos->frequency; + return max_freq; +} + +static bool search_frequency(struct cpufreq_frequency_table *table, int size, + unsigned int freq) +{ + int count; + + for (count = 0; count < size; count++) { + if (table[count].frequency == freq) + return true; + } + + return false; +} + +static int merge_cluster_tables(void) +{ + int i, j, k = 0, count = 1; + struct cpufreq_frequency_table *table; + + for (i = 0; i < MAX_CLUSTERS; i++) + count += get_table_count(freq_table[i]); + + table = kcalloc(count, sizeof(*table), GFP_KERNEL); + if (!table) + return -ENOMEM; + + freq_table[MAX_CLUSTERS] = table; + + /* Add in reverse order to get freqs in increasing order */ + for (i = MAX_CLUSTERS - 1; i >= 0; i--, count = k) { + for (j = 0; freq_table[i][j].frequency != CPUFREQ_TABLE_END; + j++) { + if (i == A15_CLUSTER && + search_frequency(table, count, freq_table[i][j].frequency)) + continue; /* skip duplicates */ + table[k++].frequency = + VIRT_FREQ(i, freq_table[i][j].frequency); + } + } + + table[k].driver_data = k; + table[k].frequency = CPUFREQ_TABLE_END; + + return 0; +} + +static void _put_cluster_clk_and_freq_table(struct device *cpu_dev, + const struct cpumask *cpumask) +{ + u32 cluster = raw_cpu_to_cluster(cpu_dev->id); + + if (!freq_table[cluster]) + return; + + clk_put(clk[cluster]); + dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table[cluster]); +} + +static void put_cluster_clk_and_freq_table(struct device *cpu_dev, + const struct cpumask *cpumask) +{ + u32 cluster = cpu_to_cluster(cpu_dev->id); + int i; + + if (atomic_dec_return(&cluster_usage[cluster])) + return; + + if (cluster < MAX_CLUSTERS) + return _put_cluster_clk_and_freq_table(cpu_dev, cpumask); + + for_each_present_cpu(i) { + struct device *cdev = get_cpu_device(i); + + if (!cdev) + return; + + _put_cluster_clk_and_freq_table(cdev, cpumask); + } + + /* free virtual table */ + kfree(freq_table[cluster]); +} + +static int _get_cluster_clk_and_freq_table(struct device *cpu_dev, + const struct cpumask *cpumask) +{ + u32 cluster = raw_cpu_to_cluster(cpu_dev->id); + int ret; + + if (freq_table[cluster]) + return 0; + + /* + * platform specific SPC code must initialise the opp table + * so just check if the OPP count is non-zero + */ + ret = dev_pm_opp_get_opp_count(cpu_dev) <= 0; + if (ret) + goto out; + + ret = dev_pm_opp_init_cpufreq_table(cpu_dev, &freq_table[cluster]); + if (ret) + goto out; + + clk[cluster] = clk_get(cpu_dev, NULL); + if (!IS_ERR(clk[cluster])) + return 0; + + dev_err(cpu_dev, "%s: Failed to get clk for cpu: %d, cluster: %d\n", + __func__, cpu_dev->id, cluster); + ret = PTR_ERR(clk[cluster]); + dev_pm_opp_free_cpufreq_table(cpu_dev, &freq_table[cluster]); + +out: + dev_err(cpu_dev, "%s: Failed to get data for cluster: %d\n", __func__, + cluster); + return ret; +} + +static int get_cluster_clk_and_freq_table(struct device *cpu_dev, + const struct cpumask *cpumask) +{ + u32 cluster = cpu_to_cluster(cpu_dev->id); + int i, ret; + + if (atomic_inc_return(&cluster_usage[cluster]) != 1) + return 0; + + if (cluster < MAX_CLUSTERS) { + ret = _get_cluster_clk_and_freq_table(cpu_dev, cpumask); + if (ret) + atomic_dec(&cluster_usage[cluster]); + return ret; + } + + /* + * Get data for all clusters and fill virtual cluster with a merge of + * both + */ + for_each_present_cpu(i) { + struct device *cdev = get_cpu_device(i); + + if (!cdev) + return -ENODEV; + + ret = _get_cluster_clk_and_freq_table(cdev, cpumask); + if (ret) + goto put_clusters; + } + + ret = merge_cluster_tables(); + if (ret) + goto put_clusters; + + /* Assuming 2 cluster, set clk_big_min and clk_little_max */ + clk_big_min = get_table_min(freq_table[A15_CLUSTER]); + clk_little_max = VIRT_FREQ(A7_CLUSTER, + get_table_max(freq_table[A7_CLUSTER])); + + return 0; + +put_clusters: + for_each_present_cpu(i) { + struct device *cdev = get_cpu_device(i); + + if (!cdev) + return -ENODEV; + + _put_cluster_clk_and_freq_table(cdev, cpumask); + } + + atomic_dec(&cluster_usage[cluster]); + + return ret; +} + +/* Per-CPU initialization */ +static int ve_spc_cpufreq_init(struct cpufreq_policy *policy) +{ + u32 cur_cluster = cpu_to_cluster(policy->cpu); + struct device *cpu_dev; + int ret; + + cpu_dev = get_cpu_device(policy->cpu); + if (!cpu_dev) { + pr_err("%s: failed to get cpu%d device\n", __func__, + policy->cpu); + return -ENODEV; + } + + if (cur_cluster < MAX_CLUSTERS) { + int cpu; + + dev_pm_opp_get_sharing_cpus(cpu_dev, policy->cpus); + + for_each_cpu(cpu, policy->cpus) + per_cpu(physical_cluster, cpu) = cur_cluster; + } else { + /* Assumption: during init, we are always running on A15 */ + per_cpu(physical_cluster, policy->cpu) = A15_CLUSTER; + } + + ret = get_cluster_clk_and_freq_table(cpu_dev, policy->cpus); + if (ret) + return ret; + + policy->freq_table = freq_table[cur_cluster]; + policy->cpuinfo.transition_latency = 1000000; /* 1 ms */ + + if (is_bL_switching_enabled()) + per_cpu(cpu_last_req_freq, policy->cpu) = + clk_get_cpu_rate(policy->cpu); + + dev_info(cpu_dev, "%s: CPU %d initialized\n", __func__, policy->cpu); + return 0; +} + +static int ve_spc_cpufreq_exit(struct cpufreq_policy *policy) +{ + struct device *cpu_dev; + + cpu_dev = get_cpu_device(policy->cpu); + if (!cpu_dev) { + pr_err("%s: failed to get cpu%d device\n", __func__, + policy->cpu); + return -ENODEV; + } + + put_cluster_clk_and_freq_table(cpu_dev, policy->related_cpus); + return 0; +} + +static struct cpufreq_driver ve_spc_cpufreq_driver = { + .name = "vexpress-spc", + .flags = CPUFREQ_HAVE_GOVERNOR_PER_POLICY | + CPUFREQ_NEED_INITIAL_FREQ_CHECK, + .verify = cpufreq_generic_frequency_table_verify, + .target_index = ve_spc_cpufreq_set_target, + .get = ve_spc_cpufreq_get_rate, + .init = ve_spc_cpufreq_init, + .exit = ve_spc_cpufreq_exit, + .register_em = cpufreq_register_em_with_opp, + .attr = cpufreq_generic_attr, +}; + +#ifdef CONFIG_BL_SWITCHER +static int bL_cpufreq_switcher_notifier(struct notifier_block *nfb, + unsigned long action, void *_arg) +{ + pr_debug("%s: action: %ld\n", __func__, action); + + switch (action) { + case BL_NOTIFY_PRE_ENABLE: + case BL_NOTIFY_PRE_DISABLE: + cpufreq_unregister_driver(&ve_spc_cpufreq_driver); + break; + + case BL_NOTIFY_POST_ENABLE: + set_switching_enabled(true); + cpufreq_register_driver(&ve_spc_cpufreq_driver); + break; + + case BL_NOTIFY_POST_DISABLE: + set_switching_enabled(false); + cpufreq_register_driver(&ve_spc_cpufreq_driver); + break; + + default: + return NOTIFY_DONE; + } + + return NOTIFY_OK; +} + +static struct notifier_block bL_switcher_notifier = { + .notifier_call = bL_cpufreq_switcher_notifier, +}; + +static int __bLs_register_notifier(void) +{ + return bL_switcher_register_notifier(&bL_switcher_notifier); +} + +static int __bLs_unregister_notifier(void) +{ + return bL_switcher_unregister_notifier(&bL_switcher_notifier); +} +#else +static int __bLs_register_notifier(void) { return 0; } +static int __bLs_unregister_notifier(void) { return 0; } +#endif + +static int ve_spc_cpufreq_probe(struct platform_device *pdev) +{ + int ret, i; + + set_switching_enabled(bL_switcher_get_enabled()); + + for (i = 0; i < MAX_CLUSTERS; i++) + mutex_init(&cluster_lock[i]); + + if (!is_bL_switching_enabled()) + ve_spc_cpufreq_driver.flags |= CPUFREQ_IS_COOLING_DEV; + + ret = cpufreq_register_driver(&ve_spc_cpufreq_driver); + if (ret) { + pr_info("%s: Failed registering platform driver: %s, err: %d\n", + __func__, ve_spc_cpufreq_driver.name, ret); + } else { + ret = __bLs_register_notifier(); + if (ret) + cpufreq_unregister_driver(&ve_spc_cpufreq_driver); + else + pr_info("%s: Registered platform driver: %s\n", + __func__, ve_spc_cpufreq_driver.name); + } + + bL_switcher_put_enabled(); + return ret; +} + +static int ve_spc_cpufreq_remove(struct platform_device *pdev) +{ + bL_switcher_get_enabled(); + __bLs_unregister_notifier(); + cpufreq_unregister_driver(&ve_spc_cpufreq_driver); + bL_switcher_put_enabled(); + pr_info("%s: Un-registered platform driver: %s\n", __func__, + ve_spc_cpufreq_driver.name); + return 0; +} + +static struct platform_driver ve_spc_cpufreq_platdrv = { + .driver = { + .name = "vexpress-spc-cpufreq", + }, + .probe = ve_spc_cpufreq_probe, + .remove = ve_spc_cpufreq_remove, +}; +module_platform_driver(ve_spc_cpufreq_platdrv); + +MODULE_ALIAS("platform:vexpress-spc-cpufreq"); +MODULE_AUTHOR("Viresh Kumar "); +MODULE_AUTHOR("Sudeep Holla "); +MODULE_DESCRIPTION("Vexpress SPC ARM big LITTLE cpufreq driver"); +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3