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/net/ethernet/qualcomm/qca_spi.c | 1037 +++++++++++++++++++++++++++++++ 1 file changed, 1037 insertions(+) create mode 100644 drivers/net/ethernet/qualcomm/qca_spi.c (limited to 'drivers/net/ethernet/qualcomm/qca_spi.c') diff --git a/drivers/net/ethernet/qualcomm/qca_spi.c b/drivers/net/ethernet/qualcomm/qca_spi.c new file mode 100644 index 000000000..c865a4be0 --- /dev/null +++ b/drivers/net/ethernet/qualcomm/qca_spi.c @@ -0,0 +1,1037 @@ +/* + * Copyright (c) 2011, 2012, Qualcomm Atheros Communications Inc. + * Copyright (c) 2014, I2SE GmbH + * + * Permission to use, copy, modify, and/or distribute this software + * for any purpose with or without fee is hereby granted, provided + * that the above copyright notice and this permission notice appear + * in all copies. + * + * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL + * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL + * THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR + * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM + * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, + * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN + * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. + */ + +/* This module implements the Qualcomm Atheros SPI protocol for + * kernel-based SPI device; it is essentially an Ethernet-to-SPI + * serial converter; + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include "qca_7k.h" +#include "qca_7k_common.h" +#include "qca_debug.h" +#include "qca_spi.h" + +#define MAX_DMA_BURST_LEN 5000 + +/* Modules parameters */ +#define QCASPI_CLK_SPEED_MIN 1000000 +#define QCASPI_CLK_SPEED_MAX 16000000 +#define QCASPI_CLK_SPEED 8000000 +static int qcaspi_clkspeed; +module_param(qcaspi_clkspeed, int, 0); +MODULE_PARM_DESC(qcaspi_clkspeed, "SPI bus clock speed (Hz). Use 1000000-16000000."); + +#define QCASPI_BURST_LEN_MIN 1 +#define QCASPI_BURST_LEN_MAX MAX_DMA_BURST_LEN +static int qcaspi_burst_len = MAX_DMA_BURST_LEN; +module_param(qcaspi_burst_len, int, 0); +MODULE_PARM_DESC(qcaspi_burst_len, "Number of data bytes per burst. Use 1-5000."); + +#define QCASPI_PLUGGABLE_MIN 0 +#define QCASPI_PLUGGABLE_MAX 1 +static int qcaspi_pluggable = QCASPI_PLUGGABLE_MIN; +module_param(qcaspi_pluggable, int, 0); +MODULE_PARM_DESC(qcaspi_pluggable, "Pluggable SPI connection (yes/no)."); + +#define QCASPI_WRITE_VERIFY_MIN 0 +#define QCASPI_WRITE_VERIFY_MAX 3 +static int wr_verify = QCASPI_WRITE_VERIFY_MIN; +module_param(wr_verify, int, 0); +MODULE_PARM_DESC(wr_verify, "SPI register write verify trails. Use 0-3."); + +#define QCASPI_TX_TIMEOUT (1 * HZ) +#define QCASPI_QCA7K_REBOOT_TIME_MS 1000 + +static void +start_spi_intr_handling(struct qcaspi *qca, u16 *intr_cause) +{ + *intr_cause = 0; + + qcaspi_write_register(qca, SPI_REG_INTR_ENABLE, 0, wr_verify); + qcaspi_read_register(qca, SPI_REG_INTR_CAUSE, intr_cause); + netdev_dbg(qca->net_dev, "interrupts: 0x%04x\n", *intr_cause); +} + +static void +end_spi_intr_handling(struct qcaspi *qca, u16 intr_cause) +{ + u16 intr_enable = (SPI_INT_CPU_ON | + SPI_INT_PKT_AVLBL | + SPI_INT_RDBUF_ERR | + SPI_INT_WRBUF_ERR); + + qcaspi_write_register(qca, SPI_REG_INTR_CAUSE, intr_cause, 0); + qcaspi_write_register(qca, SPI_REG_INTR_ENABLE, intr_enable, wr_verify); + netdev_dbg(qca->net_dev, "acking int: 0x%04x\n", intr_cause); +} + +static u32 +qcaspi_write_burst(struct qcaspi *qca, u8 *src, u32 len) +{ + __be16 cmd; + struct spi_message msg; + struct spi_transfer transfer[2]; + int ret; + + memset(&transfer, 0, sizeof(transfer)); + spi_message_init(&msg); + + cmd = cpu_to_be16(QCA7K_SPI_WRITE | QCA7K_SPI_EXTERNAL); + transfer[0].tx_buf = &cmd; + transfer[0].len = QCASPI_CMD_LEN; + transfer[1].tx_buf = src; + transfer[1].len = len; + + spi_message_add_tail(&transfer[0], &msg); + spi_message_add_tail(&transfer[1], &msg); + ret = spi_sync(qca->spi_dev, &msg); + + if (ret || (msg.actual_length != QCASPI_CMD_LEN + len)) { + qcaspi_spi_error(qca); + return 0; + } + + return len; +} + +static u32 +qcaspi_write_legacy(struct qcaspi *qca, u8 *src, u32 len) +{ + struct spi_message msg; + struct spi_transfer transfer; + int ret; + + memset(&transfer, 0, sizeof(transfer)); + spi_message_init(&msg); + + transfer.tx_buf = src; + transfer.len = len; + + spi_message_add_tail(&transfer, &msg); + ret = spi_sync(qca->spi_dev, &msg); + + if (ret || (msg.actual_length != len)) { + qcaspi_spi_error(qca); + return 0; + } + + return len; +} + +static u32 +qcaspi_read_burst(struct qcaspi *qca, u8 *dst, u32 len) +{ + struct spi_message msg; + __be16 cmd; + struct spi_transfer transfer[2]; + int ret; + + memset(&transfer, 0, sizeof(transfer)); + spi_message_init(&msg); + + cmd = cpu_to_be16(QCA7K_SPI_READ | QCA7K_SPI_EXTERNAL); + transfer[0].tx_buf = &cmd; + transfer[0].len = QCASPI_CMD_LEN; + transfer[1].rx_buf = dst; + transfer[1].len = len; + + spi_message_add_tail(&transfer[0], &msg); + spi_message_add_tail(&transfer[1], &msg); + ret = spi_sync(qca->spi_dev, &msg); + + if (ret || (msg.actual_length != QCASPI_CMD_LEN + len)) { + qcaspi_spi_error(qca); + return 0; + } + + return len; +} + +static u32 +qcaspi_read_legacy(struct qcaspi *qca, u8 *dst, u32 len) +{ + struct spi_message msg; + struct spi_transfer transfer; + int ret; + + memset(&transfer, 0, sizeof(transfer)); + spi_message_init(&msg); + + transfer.rx_buf = dst; + transfer.len = len; + + spi_message_add_tail(&transfer, &msg); + ret = spi_sync(qca->spi_dev, &msg); + + if (ret || (msg.actual_length != len)) { + qcaspi_spi_error(qca); + return 0; + } + + return len; +} + +static int +qcaspi_tx_cmd(struct qcaspi *qca, u16 cmd) +{ + __be16 tx_data; + struct spi_message msg; + struct spi_transfer transfer; + int ret; + + memset(&transfer, 0, sizeof(transfer)); + + spi_message_init(&msg); + + tx_data = cpu_to_be16(cmd); + transfer.len = sizeof(cmd); + transfer.tx_buf = &tx_data; + spi_message_add_tail(&transfer, &msg); + + ret = spi_sync(qca->spi_dev, &msg); + + if (!ret) + ret = msg.status; + + if (ret) + qcaspi_spi_error(qca); + + return ret; +} + +static int +qcaspi_tx_frame(struct qcaspi *qca, struct sk_buff *skb) +{ + u32 count; + u32 written; + u32 offset; + u32 len; + + len = skb->len; + + qcaspi_write_register(qca, SPI_REG_BFR_SIZE, len, wr_verify); + if (qca->legacy_mode) + qcaspi_tx_cmd(qca, QCA7K_SPI_WRITE | QCA7K_SPI_EXTERNAL); + + offset = 0; + while (len) { + count = len; + if (count > qca->burst_len) + count = qca->burst_len; + + if (qca->legacy_mode) { + written = qcaspi_write_legacy(qca, + skb->data + offset, + count); + } else { + written = qcaspi_write_burst(qca, + skb->data + offset, + count); + } + + if (written != count) + return -1; + + offset += count; + len -= count; + } + + return 0; +} + +static int +qcaspi_transmit(struct qcaspi *qca) +{ + struct net_device_stats *n_stats = &qca->net_dev->stats; + u16 available = 0; + u32 pkt_len; + u16 new_head; + u16 packets = 0; + + if (qca->txr.skb[qca->txr.head] == NULL) + return 0; + + qcaspi_read_register(qca, SPI_REG_WRBUF_SPC_AVA, &available); + + if (available > QCASPI_HW_BUF_LEN) { + /* This could only happen by interferences on the SPI line. + * So retry later ... + */ + qca->stats.buf_avail_err++; + return -1; + } + + while (qca->txr.skb[qca->txr.head]) { + pkt_len = qca->txr.skb[qca->txr.head]->len + QCASPI_HW_PKT_LEN; + + if (available < pkt_len) { + if (packets == 0) + qca->stats.write_buf_miss++; + break; + } + + if (qcaspi_tx_frame(qca, qca->txr.skb[qca->txr.head]) == -1) { + qca->stats.write_err++; + return -1; + } + + packets++; + n_stats->tx_packets++; + n_stats->tx_bytes += qca->txr.skb[qca->txr.head]->len; + available -= pkt_len; + + /* remove the skb from the queue */ + /* XXX After inconsistent lock states netif_tx_lock() + * has been replaced by netif_tx_lock_bh() and so on. + */ + netif_tx_lock_bh(qca->net_dev); + dev_kfree_skb(qca->txr.skb[qca->txr.head]); + qca->txr.skb[qca->txr.head] = NULL; + qca->txr.size -= pkt_len; + new_head = qca->txr.head + 1; + if (new_head >= qca->txr.count) + new_head = 0; + qca->txr.head = new_head; + if (netif_queue_stopped(qca->net_dev)) + netif_wake_queue(qca->net_dev); + netif_tx_unlock_bh(qca->net_dev); + } + + return 0; +} + +static int +qcaspi_receive(struct qcaspi *qca) +{ + struct net_device *net_dev = qca->net_dev; + struct net_device_stats *n_stats = &net_dev->stats; + u16 available = 0; + u32 bytes_read; + u8 *cp; + + /* Allocate rx SKB if we don't have one available. */ + if (!qca->rx_skb) { + qca->rx_skb = netdev_alloc_skb_ip_align(net_dev, + net_dev->mtu + + VLAN_ETH_HLEN); + if (!qca->rx_skb) { + netdev_dbg(net_dev, "out of RX resources\n"); + qca->stats.out_of_mem++; + return -1; + } + } + + /* Read the packet size. */ + qcaspi_read_register(qca, SPI_REG_RDBUF_BYTE_AVA, &available); + + netdev_dbg(net_dev, "qcaspi_receive: SPI_REG_RDBUF_BYTE_AVA: Value: %08x\n", + available); + + if (available > QCASPI_HW_BUF_LEN + QCASPI_HW_PKT_LEN) { + /* This could only happen by interferences on the SPI line. + * So retry later ... + */ + qca->stats.buf_avail_err++; + return -1; + } else if (available == 0) { + netdev_dbg(net_dev, "qcaspi_receive called without any data being available!\n"); + return -1; + } + + qcaspi_write_register(qca, SPI_REG_BFR_SIZE, available, wr_verify); + + if (qca->legacy_mode) + qcaspi_tx_cmd(qca, QCA7K_SPI_READ | QCA7K_SPI_EXTERNAL); + + while (available) { + u32 count = available; + + if (count > qca->burst_len) + count = qca->burst_len; + + if (qca->legacy_mode) { + bytes_read = qcaspi_read_legacy(qca, qca->rx_buffer, + count); + } else { + bytes_read = qcaspi_read_burst(qca, qca->rx_buffer, + count); + } + + netdev_dbg(net_dev, "available: %d, byte read: %d\n", + available, bytes_read); + + if (bytes_read) { + available -= bytes_read; + } else { + qca->stats.read_err++; + return -1; + } + + cp = qca->rx_buffer; + + while ((bytes_read--) && (qca->rx_skb)) { + s32 retcode; + + retcode = qcafrm_fsm_decode(&qca->frm_handle, + qca->rx_skb->data, + skb_tailroom(qca->rx_skb), + *cp); + cp++; + switch (retcode) { + case QCAFRM_GATHER: + case QCAFRM_NOHEAD: + break; + case QCAFRM_NOTAIL: + netdev_dbg(net_dev, "no RX tail\n"); + n_stats->rx_errors++; + n_stats->rx_dropped++; + break; + case QCAFRM_INVLEN: + netdev_dbg(net_dev, "invalid RX length\n"); + n_stats->rx_errors++; + n_stats->rx_dropped++; + break; + default: + qca->rx_skb->dev = qca->net_dev; + n_stats->rx_packets++; + n_stats->rx_bytes += retcode; + skb_put(qca->rx_skb, retcode); + qca->rx_skb->protocol = eth_type_trans( + qca->rx_skb, qca->rx_skb->dev); + skb_checksum_none_assert(qca->rx_skb); + netif_rx(qca->rx_skb); + qca->rx_skb = netdev_alloc_skb_ip_align(net_dev, + net_dev->mtu + VLAN_ETH_HLEN); + if (!qca->rx_skb) { + netdev_dbg(net_dev, "out of RX resources\n"); + n_stats->rx_errors++; + qca->stats.out_of_mem++; + break; + } + } + } + } + + return 0; +} + +/* Check that tx ring stores only so much bytes + * that fit into the internal QCA buffer. + */ + +static int +qcaspi_tx_ring_has_space(struct tx_ring *txr) +{ + if (txr->skb[txr->tail]) + return 0; + + return (txr->size + QCAFRM_MAX_LEN < QCASPI_HW_BUF_LEN) ? 1 : 0; +} + +/* Flush the tx ring. This function is only safe to + * call from the qcaspi_spi_thread. + */ + +static void +qcaspi_flush_tx_ring(struct qcaspi *qca) +{ + int i; + + /* XXX After inconsistent lock states netif_tx_lock() + * has been replaced by netif_tx_lock_bh() and so on. + */ + netif_tx_lock_bh(qca->net_dev); + for (i = 0; i < TX_RING_MAX_LEN; i++) { + if (qca->txr.skb[i]) { + dev_kfree_skb(qca->txr.skb[i]); + qca->txr.skb[i] = NULL; + qca->net_dev->stats.tx_dropped++; + } + } + qca->txr.tail = 0; + qca->txr.head = 0; + qca->txr.size = 0; + netif_tx_unlock_bh(qca->net_dev); +} + +static void +qcaspi_qca7k_sync(struct qcaspi *qca, int event) +{ + u16 signature = 0; + u16 spi_config; + u16 wrbuf_space = 0; + + if (event == QCASPI_EVENT_CPUON) { + /* Read signature twice, if not valid + * go back to unknown state. + */ + qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature); + qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature); + if (signature != QCASPI_GOOD_SIGNATURE) { + if (qca->sync == QCASPI_SYNC_READY) + qca->stats.bad_signature++; + + qca->sync = QCASPI_SYNC_UNKNOWN; + netdev_dbg(qca->net_dev, "sync: got CPU on, but signature was invalid, restart\n"); + return; + } else { + /* ensure that the WRBUF is empty */ + qcaspi_read_register(qca, SPI_REG_WRBUF_SPC_AVA, + &wrbuf_space); + if (wrbuf_space != QCASPI_HW_BUF_LEN) { + netdev_dbg(qca->net_dev, "sync: got CPU on, but wrbuf not empty. reset!\n"); + qca->sync = QCASPI_SYNC_UNKNOWN; + } else { + netdev_dbg(qca->net_dev, "sync: got CPU on, now in sync\n"); + qca->sync = QCASPI_SYNC_READY; + return; + } + } + } + + switch (qca->sync) { + case QCASPI_SYNC_READY: + /* Check signature twice, if not valid go to unknown state. */ + qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature); + if (signature != QCASPI_GOOD_SIGNATURE) + qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature); + + if (signature != QCASPI_GOOD_SIGNATURE) { + qca->sync = QCASPI_SYNC_UNKNOWN; + qca->stats.bad_signature++; + netdev_dbg(qca->net_dev, "sync: bad signature, restart\n"); + /* don't reset right away */ + return; + } + break; + case QCASPI_SYNC_UNKNOWN: + /* Read signature, if not valid stay in unknown state */ + qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature); + if (signature != QCASPI_GOOD_SIGNATURE) { + netdev_dbg(qca->net_dev, "sync: could not read signature to reset device, retry.\n"); + return; + } + + /* TODO: use GPIO to reset QCA7000 in legacy mode*/ + netdev_dbg(qca->net_dev, "sync: resetting device.\n"); + qcaspi_read_register(qca, SPI_REG_SPI_CONFIG, &spi_config); + spi_config |= QCASPI_SLAVE_RESET_BIT; + qcaspi_write_register(qca, SPI_REG_SPI_CONFIG, spi_config, 0); + + qca->sync = QCASPI_SYNC_RESET; + qca->stats.trig_reset++; + qca->reset_count = 0; + break; + case QCASPI_SYNC_RESET: + qca->reset_count++; + netdev_dbg(qca->net_dev, "sync: waiting for CPU on, count %u.\n", + qca->reset_count); + if (qca->reset_count >= QCASPI_RESET_TIMEOUT) { + /* reset did not seem to take place, try again */ + qca->sync = QCASPI_SYNC_UNKNOWN; + qca->stats.reset_timeout++; + netdev_dbg(qca->net_dev, "sync: reset timeout, restarting process.\n"); + } + break; + } +} + +static int +qcaspi_spi_thread(void *data) +{ + struct qcaspi *qca = data; + u16 intr_cause = 0; + + netdev_info(qca->net_dev, "SPI thread created\n"); + while (!kthread_should_stop()) { + set_current_state(TASK_INTERRUPTIBLE); + if ((qca->intr_req == qca->intr_svc) && + (qca->txr.skb[qca->txr.head] == NULL) && + (qca->sync == QCASPI_SYNC_READY)) + schedule(); + + set_current_state(TASK_RUNNING); + + netdev_dbg(qca->net_dev, "have work to do. int: %d, tx_skb: %p\n", + qca->intr_req - qca->intr_svc, + qca->txr.skb[qca->txr.head]); + + qcaspi_qca7k_sync(qca, QCASPI_EVENT_UPDATE); + + if (qca->sync != QCASPI_SYNC_READY) { + netdev_dbg(qca->net_dev, "sync: not ready %u, turn off carrier and flush\n", + (unsigned int)qca->sync); + netif_stop_queue(qca->net_dev); + netif_carrier_off(qca->net_dev); + qcaspi_flush_tx_ring(qca); + msleep(QCASPI_QCA7K_REBOOT_TIME_MS); + } + + if (qca->intr_svc != qca->intr_req) { + qca->intr_svc = qca->intr_req; + start_spi_intr_handling(qca, &intr_cause); + + if (intr_cause & SPI_INT_CPU_ON) { + qcaspi_qca7k_sync(qca, QCASPI_EVENT_CPUON); + + /* not synced. */ + if (qca->sync != QCASPI_SYNC_READY) + continue; + + qca->stats.device_reset++; + netif_wake_queue(qca->net_dev); + netif_carrier_on(qca->net_dev); + } + + if (intr_cause & SPI_INT_RDBUF_ERR) { + /* restart sync */ + netdev_dbg(qca->net_dev, "===> rdbuf error!\n"); + qca->stats.read_buf_err++; + qca->sync = QCASPI_SYNC_UNKNOWN; + continue; + } + + if (intr_cause & SPI_INT_WRBUF_ERR) { + /* restart sync */ + netdev_dbg(qca->net_dev, "===> wrbuf error!\n"); + qca->stats.write_buf_err++; + qca->sync = QCASPI_SYNC_UNKNOWN; + continue; + } + + /* can only handle other interrupts + * if sync has occurred + */ + if (qca->sync == QCASPI_SYNC_READY) { + if (intr_cause & SPI_INT_PKT_AVLBL) + qcaspi_receive(qca); + } + + end_spi_intr_handling(qca, intr_cause); + } + + if (qca->sync == QCASPI_SYNC_READY) + qcaspi_transmit(qca); + } + set_current_state(TASK_RUNNING); + netdev_info(qca->net_dev, "SPI thread exit\n"); + + return 0; +} + +static irqreturn_t +qcaspi_intr_handler(int irq, void *data) +{ + struct qcaspi *qca = data; + + qca->intr_req++; + if (qca->spi_thread) + wake_up_process(qca->spi_thread); + + return IRQ_HANDLED; +} + +static int +qcaspi_netdev_open(struct net_device *dev) +{ + struct qcaspi *qca = netdev_priv(dev); + int ret = 0; + + if (!qca) + return -EINVAL; + + qca->intr_req = 1; + qca->intr_svc = 0; + qca->sync = QCASPI_SYNC_UNKNOWN; + qcafrm_fsm_init_spi(&qca->frm_handle); + + qca->spi_thread = kthread_run((void *)qcaspi_spi_thread, + qca, "%s", dev->name); + + if (IS_ERR(qca->spi_thread)) { + netdev_err(dev, "%s: unable to start kernel thread.\n", + QCASPI_DRV_NAME); + return PTR_ERR(qca->spi_thread); + } + + ret = request_irq(qca->spi_dev->irq, qcaspi_intr_handler, 0, + dev->name, qca); + if (ret) { + netdev_err(dev, "%s: unable to get IRQ %d (irqval=%d).\n", + QCASPI_DRV_NAME, qca->spi_dev->irq, ret); + kthread_stop(qca->spi_thread); + return ret; + } + + /* SPI thread takes care of TX queue */ + + return 0; +} + +static int +qcaspi_netdev_close(struct net_device *dev) +{ + struct qcaspi *qca = netdev_priv(dev); + + netif_stop_queue(dev); + + qcaspi_write_register(qca, SPI_REG_INTR_ENABLE, 0, wr_verify); + free_irq(qca->spi_dev->irq, qca); + + kthread_stop(qca->spi_thread); + qca->spi_thread = NULL; + qcaspi_flush_tx_ring(qca); + + return 0; +} + +static netdev_tx_t +qcaspi_netdev_xmit(struct sk_buff *skb, struct net_device *dev) +{ + u32 frame_len; + u8 *ptmp; + struct qcaspi *qca = netdev_priv(dev); + u16 new_tail; + struct sk_buff *tskb; + u8 pad_len = 0; + + if (skb->len < QCAFRM_MIN_LEN) + pad_len = QCAFRM_MIN_LEN - skb->len; + + if (qca->txr.skb[qca->txr.tail]) { + netdev_warn(qca->net_dev, "queue was unexpectedly full!\n"); + netif_stop_queue(qca->net_dev); + qca->stats.ring_full++; + return NETDEV_TX_BUSY; + } + + if ((skb_headroom(skb) < QCAFRM_HEADER_LEN) || + (skb_tailroom(skb) < QCAFRM_FOOTER_LEN + pad_len)) { + tskb = skb_copy_expand(skb, QCAFRM_HEADER_LEN, + QCAFRM_FOOTER_LEN + pad_len, GFP_ATOMIC); + if (!tskb) { + qca->stats.out_of_mem++; + return NETDEV_TX_BUSY; + } + dev_kfree_skb(skb); + skb = tskb; + } + + frame_len = skb->len + pad_len; + + ptmp = skb_push(skb, QCAFRM_HEADER_LEN); + qcafrm_create_header(ptmp, frame_len); + + if (pad_len) { + ptmp = skb_put_zero(skb, pad_len); + } + + ptmp = skb_put(skb, QCAFRM_FOOTER_LEN); + qcafrm_create_footer(ptmp); + + netdev_dbg(qca->net_dev, "Tx-ing packet: Size: 0x%08x\n", + skb->len); + + qca->txr.size += skb->len + QCASPI_HW_PKT_LEN; + + new_tail = qca->txr.tail + 1; + if (new_tail >= qca->txr.count) + new_tail = 0; + + qca->txr.skb[qca->txr.tail] = skb; + qca->txr.tail = new_tail; + + if (!qcaspi_tx_ring_has_space(&qca->txr)) { + netif_stop_queue(qca->net_dev); + qca->stats.ring_full++; + } + + netif_trans_update(dev); + + if (qca->spi_thread) + wake_up_process(qca->spi_thread); + + return NETDEV_TX_OK; +} + +static void +qcaspi_netdev_tx_timeout(struct net_device *dev, unsigned int txqueue) +{ + struct qcaspi *qca = netdev_priv(dev); + + netdev_info(qca->net_dev, "Transmit timeout at %ld, latency %ld\n", + jiffies, jiffies - dev_trans_start(dev)); + qca->net_dev->stats.tx_errors++; + /* Trigger tx queue flush and QCA7000 reset */ + qca->sync = QCASPI_SYNC_UNKNOWN; + + if (qca->spi_thread) + wake_up_process(qca->spi_thread); +} + +static int +qcaspi_netdev_init(struct net_device *dev) +{ + struct qcaspi *qca = netdev_priv(dev); + + dev->mtu = QCAFRM_MAX_MTU; + dev->type = ARPHRD_ETHER; + qca->clkspeed = qcaspi_clkspeed; + qca->burst_len = qcaspi_burst_len; + qca->spi_thread = NULL; + qca->buffer_size = (dev->mtu + VLAN_ETH_HLEN + QCAFRM_HEADER_LEN + + QCAFRM_FOOTER_LEN + 4) * 4; + + memset(&qca->stats, 0, sizeof(struct qcaspi_stats)); + + qca->rx_buffer = kmalloc(qca->buffer_size, GFP_KERNEL); + if (!qca->rx_buffer) + return -ENOBUFS; + + qca->rx_skb = netdev_alloc_skb_ip_align(dev, qca->net_dev->mtu + + VLAN_ETH_HLEN); + if (!qca->rx_skb) { + kfree(qca->rx_buffer); + netdev_info(qca->net_dev, "Failed to allocate RX sk_buff.\n"); + return -ENOBUFS; + } + + return 0; +} + +static void +qcaspi_netdev_uninit(struct net_device *dev) +{ + struct qcaspi *qca = netdev_priv(dev); + + kfree(qca->rx_buffer); + qca->buffer_size = 0; + dev_kfree_skb(qca->rx_skb); +} + +static const struct net_device_ops qcaspi_netdev_ops = { + .ndo_init = qcaspi_netdev_init, + .ndo_uninit = qcaspi_netdev_uninit, + .ndo_open = qcaspi_netdev_open, + .ndo_stop = qcaspi_netdev_close, + .ndo_start_xmit = qcaspi_netdev_xmit, + .ndo_set_mac_address = eth_mac_addr, + .ndo_tx_timeout = qcaspi_netdev_tx_timeout, + .ndo_validate_addr = eth_validate_addr, +}; + +static void +qcaspi_netdev_setup(struct net_device *dev) +{ + struct qcaspi *qca = NULL; + + dev->netdev_ops = &qcaspi_netdev_ops; + qcaspi_set_ethtool_ops(dev); + dev->watchdog_timeo = QCASPI_TX_TIMEOUT; + dev->priv_flags &= ~IFF_TX_SKB_SHARING; + dev->tx_queue_len = 100; + + /* MTU range: 46 - 1500 */ + dev->min_mtu = QCAFRM_MIN_MTU; + dev->max_mtu = QCAFRM_MAX_MTU; + + qca = netdev_priv(dev); + memset(qca, 0, sizeof(struct qcaspi)); + + memset(&qca->txr, 0, sizeof(qca->txr)); + qca->txr.count = TX_RING_MAX_LEN; +} + +static const struct of_device_id qca_spi_of_match[] = { + { .compatible = "qca,qca7000" }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(of, qca_spi_of_match); + +static int +qca_spi_probe(struct spi_device *spi) +{ + struct qcaspi *qca = NULL; + struct net_device *qcaspi_devs = NULL; + u8 legacy_mode = 0; + u16 signature; + int ret; + + if (!spi->dev.of_node) { + dev_err(&spi->dev, "Missing device tree\n"); + return -EINVAL; + } + + legacy_mode = of_property_read_bool(spi->dev.of_node, + "qca,legacy-mode"); + + if (qcaspi_clkspeed == 0) { + if (spi->max_speed_hz) + qcaspi_clkspeed = spi->max_speed_hz; + else + qcaspi_clkspeed = QCASPI_CLK_SPEED; + } + + if ((qcaspi_clkspeed < QCASPI_CLK_SPEED_MIN) || + (qcaspi_clkspeed > QCASPI_CLK_SPEED_MAX)) { + dev_err(&spi->dev, "Invalid clkspeed: %d\n", + qcaspi_clkspeed); + return -EINVAL; + } + + if ((qcaspi_burst_len < QCASPI_BURST_LEN_MIN) || + (qcaspi_burst_len > QCASPI_BURST_LEN_MAX)) { + dev_err(&spi->dev, "Invalid burst len: %d\n", + qcaspi_burst_len); + return -EINVAL; + } + + if ((qcaspi_pluggable < QCASPI_PLUGGABLE_MIN) || + (qcaspi_pluggable > QCASPI_PLUGGABLE_MAX)) { + dev_err(&spi->dev, "Invalid pluggable: %d\n", + qcaspi_pluggable); + return -EINVAL; + } + + if (wr_verify < QCASPI_WRITE_VERIFY_MIN || + wr_verify > QCASPI_WRITE_VERIFY_MAX) { + dev_err(&spi->dev, "Invalid write verify: %d\n", + wr_verify); + return -EINVAL; + } + + dev_info(&spi->dev, "ver=%s, clkspeed=%d, burst_len=%d, pluggable=%d\n", + QCASPI_DRV_VERSION, + qcaspi_clkspeed, + qcaspi_burst_len, + qcaspi_pluggable); + + spi->mode = SPI_MODE_3; + spi->max_speed_hz = qcaspi_clkspeed; + if (spi_setup(spi) < 0) { + dev_err(&spi->dev, "Unable to setup SPI device\n"); + return -EFAULT; + } + + qcaspi_devs = alloc_etherdev(sizeof(struct qcaspi)); + if (!qcaspi_devs) + return -ENOMEM; + + qcaspi_netdev_setup(qcaspi_devs); + SET_NETDEV_DEV(qcaspi_devs, &spi->dev); + + qca = netdev_priv(qcaspi_devs); + if (!qca) { + free_netdev(qcaspi_devs); + dev_err(&spi->dev, "Fail to retrieve private structure\n"); + return -ENOMEM; + } + qca->net_dev = qcaspi_devs; + qca->spi_dev = spi; + qca->legacy_mode = legacy_mode; + + spi_set_drvdata(spi, qcaspi_devs); + + ret = of_get_ethdev_address(spi->dev.of_node, qca->net_dev); + if (ret) { + eth_hw_addr_random(qca->net_dev); + dev_info(&spi->dev, "Using random MAC address: %pM\n", + qca->net_dev->dev_addr); + } + + netif_carrier_off(qca->net_dev); + + if (!qcaspi_pluggable) { + qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature); + qcaspi_read_register(qca, SPI_REG_SIGNATURE, &signature); + + if (signature != QCASPI_GOOD_SIGNATURE) { + dev_err(&spi->dev, "Invalid signature (0x%04X)\n", + signature); + free_netdev(qcaspi_devs); + return -EFAULT; + } + } + + if (register_netdev(qcaspi_devs)) { + dev_err(&spi->dev, "Unable to register net device %s\n", + qcaspi_devs->name); + free_netdev(qcaspi_devs); + return -EFAULT; + } + + qcaspi_init_device_debugfs(qca); + + return 0; +} + +static void +qca_spi_remove(struct spi_device *spi) +{ + struct net_device *qcaspi_devs = spi_get_drvdata(spi); + struct qcaspi *qca = netdev_priv(qcaspi_devs); + + qcaspi_remove_device_debugfs(qca); + + unregister_netdev(qcaspi_devs); + free_netdev(qcaspi_devs); +} + +static const struct spi_device_id qca_spi_id[] = { + { "qca7000", 0 }, + { /* sentinel */ } +}; +MODULE_DEVICE_TABLE(spi, qca_spi_id); + +static struct spi_driver qca_spi_driver = { + .driver = { + .name = QCASPI_DRV_NAME, + .of_match_table = qca_spi_of_match, + }, + .id_table = qca_spi_id, + .probe = qca_spi_probe, + .remove = qca_spi_remove, +}; +module_spi_driver(qca_spi_driver); + +MODULE_DESCRIPTION("Qualcomm Atheros QCA7000 SPI Driver"); +MODULE_AUTHOR("Qualcomm Atheros Communications"); +MODULE_AUTHOR("Stefan Wahren "); +MODULE_LICENSE("Dual BSD/GPL"); +MODULE_VERSION(QCASPI_DRV_VERSION); -- cgit v1.2.3