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author | 2023-02-21 18:24:12 -0800 | |
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committer | 2023-02-21 18:24:12 -0800 | |
commit | 5b7c4cabbb65f5c469464da6c5f614cbd7f730f2 (patch) | |
tree | cc5c2d0a898769fd59549594fedb3ee6f84e59a0 /drivers/i2c/busses/i2c-cros-ec-tunnel.c | |
download | linux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.tar.gz linux-5b7c4cabbb65f5c469464da6c5f614cbd7f730f2.zip |
Merge tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-nextgrafted
Pull networking updates from Jakub Kicinski:
"Core:
- Add dedicated kmem_cache for typical/small skb->head, avoid having
to access struct page at kfree time, and improve memory use.
- Introduce sysctl to set default RPS configuration for new netdevs.
- Define Netlink protocol specification format which can be used to
describe messages used by each family and auto-generate parsers.
Add tools for generating kernel data structures and uAPI headers.
- Expose all net/core sysctls inside netns.
- Remove 4s sleep in netpoll if carrier is instantly detected on
boot.
- Add configurable limit of MDB entries per port, and port-vlan.
- Continue populating drop reasons throughout the stack.
- Retire a handful of legacy Qdiscs and classifiers.
Protocols:
- Support IPv4 big TCP (TSO frames larger than 64kB).
- Add IP_LOCAL_PORT_RANGE socket option, to control local port range
on socket by socket basis.
- Track and report in procfs number of MPTCP sockets used.
- Support mixing IPv4 and IPv6 flows in the in-kernel MPTCP path
manager.
- IPv6: don't check net.ipv6.route.max_size and rely on garbage
collection to free memory (similarly to IPv4).
- Support Penultimate Segment Pop (PSP) flavor in SRv6 (RFC8986).
- ICMP: add per-rate limit counters.
- Add support for user scanning requests in ieee802154.
- Remove static WEP support.
- Support minimal Wi-Fi 7 Extremely High Throughput (EHT) rate
reporting.
- WiFi 7 EHT channel puncturing support (client & AP).
BPF:
- Add a rbtree data structure following the "next-gen data structure"
precedent set by recently added linked list, that is, by using
kfunc + kptr instead of adding a new BPF map type.
- Expose XDP hints via kfuncs with initial support for RX hash and
timestamp metadata.
- Add BPF_F_NO_TUNNEL_KEY extension to bpf_skb_set_tunnel_key to
better support decap on GRE tunnel devices not operating in collect
metadata.
- Improve x86 JIT's codegen for PROBE_MEM runtime error checks.
- Remove the need for trace_printk_lock for bpf_trace_printk and
bpf_trace_vprintk helpers.
- Extend libbpf's bpf_tracing.h support for tracing arguments of
kprobes/uprobes and syscall as a special case.
- Significantly reduce the search time for module symbols by
livepatch and BPF.
- Enable cpumasks to be used as kptrs, which is useful for tracing
programs tracking which tasks end up running on which CPUs in
different time intervals.
- Add support for BPF trampoline on s390x and riscv64.
- Add capability to export the XDP features supported by the NIC.
- Add __bpf_kfunc tag for marking kernel functions as kfuncs.
- Add cgroup.memory=nobpf kernel parameter option to disable BPF
memory accounting for container environments.
Netfilter:
- Remove the CLUSTERIP target. It has been marked as obsolete for
years, and we still have WARN splats wrt races of the out-of-band
/proc interface installed by this target.
- Add 'destroy' commands to nf_tables. They are identical to the
existing 'delete' commands, but do not return an error if the
referenced object (set, chain, rule...) did not exist.
Driver API:
- Improve cpumask_local_spread() locality to help NICs set the right
IRQ affinity on AMD platforms.
- Separate C22 and C45 MDIO bus transactions more clearly.
- Introduce new DCB table to control DSCP rewrite on egress.
- Support configuration of Physical Layer Collision Avoidance (PLCA)
Reconciliation Sublayer (RS) (802.3cg-2019). Modern version of
shared medium Ethernet.
- Support for MAC Merge layer (IEEE 802.3-2018 clause 99). Allowing
preemption of low priority frames by high priority frames.
- Add support for controlling MACSec offload using netlink SET.
- Rework devlink instance refcounts to allow registration and
de-registration under the instance lock. Split the code into
multiple files, drop some of the unnecessarily granular locks and
factor out common parts of netlink operation handling.
- Add TX frame aggregation parameters (for USB drivers).
- Add a new attr TCA_EXT_WARN_MSG to report TC (offload) warning
messages with notifications for debug.
- Allow offloading of UDP NEW connections via act_ct.
- Add support for per action HW stats in TC.
- Support hardware miss to TC action (continue processing in SW from
a specific point in the action chain).
- Warn if old Wireless Extension user space interface is used with
modern cfg80211/mac80211 drivers. Do not support Wireless
Extensions for Wi-Fi 7 devices at all. Everyone should switch to
using nl80211 interface instead.
- Improve the CAN bit timing configuration. Use extack to return
error messages directly to user space, update the SJW handling,
including the definition of a new default value that will benefit
CAN-FD controllers, by increasing their oscillator tolerance.
New hardware / drivers:
- Ethernet:
- nVidia BlueField-3 support (control traffic driver)
- Ethernet support for imx93 SoCs
- Motorcomm yt8531 gigabit Ethernet PHY
- onsemi NCN26000 10BASE-T1S PHY (with support for PLCA)
- Microchip LAN8841 PHY (incl. cable diagnostics and PTP)
- Amlogic gxl MDIO mux
- WiFi:
- RealTek RTL8188EU (rtl8xxxu)
- Qualcomm Wi-Fi 7 devices (ath12k)
- CAN:
- Renesas R-Car V4H
Drivers:
- Bluetooth:
- Set Per Platform Antenna Gain (PPAG) for Intel controllers.
- Ethernet NICs:
- Intel (1G, igc):
- support TSN / Qbv / packet scheduling features of i226 model
- Intel (100G, ice):
- use GNSS subsystem instead of TTY
- multi-buffer XDP support
- extend support for GPIO pins to E823 devices
- nVidia/Mellanox:
- update the shared buffer configuration on PFC commands
- implement PTP adjphase function for HW offset control
- TC support for Geneve and GRE with VF tunnel offload
- more efficient crypto key management method
- multi-port eswitch support
- Netronome/Corigine:
- add DCB IEEE support
- support IPsec offloading for NFP3800
- Freescale/NXP (enetc):
- support XDP_REDIRECT for XDP non-linear buffers
- improve reconfig, avoid link flap and waiting for idle
- support MAC Merge layer
- Other NICs:
- sfc/ef100: add basic devlink support for ef100
- ionic: rx_push mode operation (writing descriptors via MMIO)
- bnxt: use the auxiliary bus abstraction for RDMA
- r8169: disable ASPM and reset bus in case of tx timeout
- cpsw: support QSGMII mode for J721e CPSW9G
- cpts: support pulse-per-second output
- ngbe: add an mdio bus driver
- usbnet: optimize usbnet_bh() by avoiding unnecessary queuing
- r8152: handle devices with FW with NCM support
- amd-xgbe: support 10Mbps, 2.5GbE speeds and rx-adaptation
- virtio-net: support multi buffer XDP
- virtio/vsock: replace virtio_vsock_pkt with sk_buff
- tsnep: XDP support
- Ethernet high-speed switches:
- nVidia/Mellanox (mlxsw):
- add support for latency TLV (in FW control messages)
- Microchip (sparx5):
- separate explicit and implicit traffic forwarding rules, make
the implicit rules always active
- add support for egress DSCP rewrite
- IS0 VCAP support (Ingress Classification)
- IS2 VCAP filters (protos, L3 addrs, L4 ports, flags, ToS
etc.)
- ES2 VCAP support (Egress Access Control)
- support for Per-Stream Filtering and Policing (802.1Q,
8.6.5.1)
- Ethernet embedded switches:
- Marvell (mv88e6xxx):
- add MAB (port auth) offload support
- enable PTP receive for mv88e6390
- NXP (ocelot):
- support MAC Merge layer
- support for the the vsc7512 internal copper phys
- Microchip:
- lan9303: convert to PHYLINK
- lan966x: support TC flower filter statistics
- lan937x: PTP support for KSZ9563/KSZ8563 and LAN937x
- lan937x: support Credit Based Shaper configuration
- ksz9477: support Energy Efficient Ethernet
- other:
- qca8k: convert to regmap read/write API, use bulk operations
- rswitch: Improve TX timestamp accuracy
- Intel WiFi (iwlwifi):
- EHT (Wi-Fi 7) rate reporting
- STEP equalizer support: transfer some STEP (connection to radio
on platforms with integrated wifi) related parameters from the
BIOS to the firmware.
- Qualcomm 802.11ax WiFi (ath11k):
- IPQ5018 support
- Fine Timing Measurement (FTM) responder role support
- channel 177 support
- MediaTek WiFi (mt76):
- per-PHY LED support
- mt7996: EHT (Wi-Fi 7) support
- Wireless Ethernet Dispatch (WED) reset support
- switch to using page pool allocator
- RealTek WiFi (rtw89):
- support new version of Bluetooth co-existance
- Mobile:
- rmnet: support TX aggregation"
* tag 'net-next-6.3' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (1872 commits)
page_pool: add a comment explaining the fragment counter usage
net: ethtool: fix __ethtool_dev_mm_supported() implementation
ethtool: pse-pd: Fix double word in comments
xsk: add linux/vmalloc.h to xsk.c
sefltests: netdevsim: wait for devlink instance after netns removal
selftest: fib_tests: Always cleanup before exit
net/mlx5e: Align IPsec ASO result memory to be as required by hardware
net/mlx5e: TC, Set CT miss to the specific ct action instance
net/mlx5e: Rename CHAIN_TO_REG to MAPPED_OBJ_TO_REG
net/mlx5: Refactor tc miss handling to a single function
net/mlx5: Kconfig: Make tc offload depend on tc skb extension
net/sched: flower: Support hardware miss to tc action
net/sched: flower: Move filter handle initialization earlier
net/sched: cls_api: Support hardware miss to tc action
net/sched: Rename user cookie and act cookie
sfc: fix builds without CONFIG_RTC_LIB
sfc: clean up some inconsistent indentings
net/mlx4_en: Introduce flexible array to silence overflow warning
net: lan966x: Fix possible deadlock inside PTP
net/ulp: Remove redundant ->clone() test in inet_clone_ulp().
...
Diffstat (limited to 'drivers/i2c/busses/i2c-cros-ec-tunnel.c')
-rw-r--r-- | drivers/i2c/busses/i2c-cros-ec-tunnel.c | 321 |
1 files changed, 321 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-cros-ec-tunnel.c b/drivers/i2c/busses/i2c-cros-ec-tunnel.c new file mode 100644 index 000000000..4e787dc70 --- /dev/null +++ b/drivers/i2c/busses/i2c-cros-ec-tunnel.c @@ -0,0 +1,321 @@ +// SPDX-License-Identifier: GPL-2.0+ +// Expose an I2C passthrough to the ChromeOS EC. +// +// Copyright (C) 2013 Google, Inc. + +#include <linux/acpi.h> +#include <linux/module.h> +#include <linux/i2c.h> +#include <linux/platform_data/cros_ec_commands.h> +#include <linux/platform_data/cros_ec_proto.h> +#include <linux/platform_device.h> +#include <linux/slab.h> + +#define I2C_MAX_RETRIES 3 + +/** + * struct ec_i2c_device - Driver data for I2C tunnel + * + * @dev: Device node + * @adap: I2C adapter + * @ec: Pointer to EC device + * @remote_bus: The EC bus number we tunnel to on the other side. + * @request_buf: Buffer for transmitting data; we expect most transfers to fit. + * @response_buf: Buffer for receiving data; we expect most transfers to fit. + */ + +struct ec_i2c_device { + struct device *dev; + struct i2c_adapter adap; + struct cros_ec_device *ec; + + u16 remote_bus; + + u8 request_buf[256]; + u8 response_buf[256]; +}; + +/** + * ec_i2c_count_message - Count bytes needed for ec_i2c_construct_message + * + * @i2c_msgs: The i2c messages to read + * @num: The number of i2c messages. + * + * Returns the number of bytes the messages will take up. + */ +static int ec_i2c_count_message(const struct i2c_msg i2c_msgs[], int num) +{ + int i; + int size; + + size = sizeof(struct ec_params_i2c_passthru); + size += num * sizeof(struct ec_params_i2c_passthru_msg); + for (i = 0; i < num; i++) + if (!(i2c_msgs[i].flags & I2C_M_RD)) + size += i2c_msgs[i].len; + + return size; +} + +/** + * ec_i2c_construct_message - construct a message to go to the EC + * + * This function effectively stuffs the standard i2c_msg format of Linux into + * a format that the EC understands. + * + * @buf: The buffer to fill. We assume that the buffer is big enough. + * @i2c_msgs: The i2c messages to read. + * @num: The number of i2c messages. + * @bus_num: The remote bus number we want to talk to. + * + * Returns 0 or a negative error number. + */ +static int ec_i2c_construct_message(u8 *buf, const struct i2c_msg i2c_msgs[], + int num, u16 bus_num) +{ + struct ec_params_i2c_passthru *params; + u8 *out_data; + int i; + + out_data = buf + sizeof(struct ec_params_i2c_passthru) + + num * sizeof(struct ec_params_i2c_passthru_msg); + + params = (struct ec_params_i2c_passthru *)buf; + params->port = bus_num; + params->num_msgs = num; + for (i = 0; i < num; i++) { + const struct i2c_msg *i2c_msg = &i2c_msgs[i]; + struct ec_params_i2c_passthru_msg *msg = ¶ms->msg[i]; + + msg->len = i2c_msg->len; + msg->addr_flags = i2c_msg->addr; + + if (i2c_msg->flags & I2C_M_TEN) + return -EINVAL; + + if (i2c_msg->flags & I2C_M_RD) { + msg->addr_flags |= EC_I2C_FLAG_READ; + } else { + memcpy(out_data, i2c_msg->buf, msg->len); + out_data += msg->len; + } + } + + return 0; +} + +/** + * ec_i2c_count_response - Count bytes needed for ec_i2c_parse_response + * + * @i2c_msgs: The i2c messages to fill up. + * @num: The number of i2c messages expected. + * + * Returns the number of response bytes expeced. + */ +static int ec_i2c_count_response(struct i2c_msg i2c_msgs[], int num) +{ + int size; + int i; + + size = sizeof(struct ec_response_i2c_passthru); + for (i = 0; i < num; i++) + if (i2c_msgs[i].flags & I2C_M_RD) + size += i2c_msgs[i].len; + + return size; +} + +/** + * ec_i2c_parse_response - Parse a response from the EC + * + * We'll take the EC's response and copy it back into msgs. + * + * @buf: The buffer to parse. + * @i2c_msgs: The i2c messages to fill up. + * @num: The number of i2c messages; will be modified to include the actual + * number received. + * + * Returns 0 or a negative error number. + */ +static int ec_i2c_parse_response(const u8 *buf, struct i2c_msg i2c_msgs[], + int *num) +{ + const struct ec_response_i2c_passthru *resp; + const u8 *in_data; + int i; + + in_data = buf + sizeof(struct ec_response_i2c_passthru); + + resp = (const struct ec_response_i2c_passthru *)buf; + if (resp->i2c_status & EC_I2C_STATUS_TIMEOUT) + return -ETIMEDOUT; + else if (resp->i2c_status & EC_I2C_STATUS_NAK) + return -ENXIO; + else if (resp->i2c_status & EC_I2C_STATUS_ERROR) + return -EIO; + + /* Other side could send us back fewer messages, but not more */ + if (resp->num_msgs > *num) + return -EPROTO; + *num = resp->num_msgs; + + for (i = 0; i < *num; i++) { + struct i2c_msg *i2c_msg = &i2c_msgs[i]; + + if (i2c_msgs[i].flags & I2C_M_RD) { + memcpy(i2c_msg->buf, in_data, i2c_msg->len); + in_data += i2c_msg->len; + } + } + + return 0; +} + +static int ec_i2c_xfer(struct i2c_adapter *adap, struct i2c_msg i2c_msgs[], + int num) +{ + struct ec_i2c_device *bus = adap->algo_data; + struct device *dev = bus->dev; + const u16 bus_num = bus->remote_bus; + int request_len; + int response_len; + int alloc_size; + int result; + struct cros_ec_command *msg; + + request_len = ec_i2c_count_message(i2c_msgs, num); + if (request_len < 0) { + dev_warn(dev, "Error constructing message %d\n", request_len); + return request_len; + } + + response_len = ec_i2c_count_response(i2c_msgs, num); + if (response_len < 0) { + /* Unexpected; no errors should come when NULL response */ + dev_warn(dev, "Error preparing response %d\n", response_len); + return response_len; + } + + alloc_size = max(request_len, response_len); + msg = kmalloc(sizeof(*msg) + alloc_size, GFP_KERNEL); + if (!msg) + return -ENOMEM; + + result = ec_i2c_construct_message(msg->data, i2c_msgs, num, bus_num); + if (result) { + dev_err(dev, "Error constructing EC i2c message %d\n", result); + goto exit; + } + + msg->version = 0; + msg->command = EC_CMD_I2C_PASSTHRU; + msg->outsize = request_len; + msg->insize = response_len; + + result = cros_ec_cmd_xfer_status(bus->ec, msg); + if (result < 0) { + dev_err(dev, "Error transferring EC i2c message %d\n", result); + goto exit; + } + + result = ec_i2c_parse_response(msg->data, i2c_msgs, &num); + if (result < 0) + goto exit; + + /* Indicate success by saying how many messages were sent */ + result = num; +exit: + kfree(msg); + return result; +} + +static u32 ec_i2c_functionality(struct i2c_adapter *adap) +{ + return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL; +} + +static const struct i2c_algorithm ec_i2c_algorithm = { + .master_xfer = ec_i2c_xfer, + .functionality = ec_i2c_functionality, +}; + +static int ec_i2c_probe(struct platform_device *pdev) +{ + struct cros_ec_device *ec = dev_get_drvdata(pdev->dev.parent); + struct device *dev = &pdev->dev; + struct ec_i2c_device *bus = NULL; + u32 remote_bus; + int err; + + if (!ec->cmd_xfer) { + dev_err(dev, "Missing sendrecv\n"); + return -EINVAL; + } + + bus = devm_kzalloc(dev, sizeof(*bus), GFP_KERNEL); + if (bus == NULL) + return -ENOMEM; + + err = device_property_read_u32(dev, "google,remote-bus", &remote_bus); + if (err) { + dev_err(dev, "Couldn't read remote-bus property\n"); + return err; + } + bus->remote_bus = remote_bus; + + bus->ec = ec; + bus->dev = dev; + + bus->adap.owner = THIS_MODULE; + strscpy(bus->adap.name, "cros-ec-i2c-tunnel", sizeof(bus->adap.name)); + bus->adap.algo = &ec_i2c_algorithm; + bus->adap.algo_data = bus; + bus->adap.dev.parent = &pdev->dev; + bus->adap.dev.of_node = pdev->dev.of_node; + bus->adap.retries = I2C_MAX_RETRIES; + ACPI_COMPANION_SET(&bus->adap.dev, ACPI_COMPANION(&pdev->dev)); + + err = i2c_add_adapter(&bus->adap); + if (err) + return err; + platform_set_drvdata(pdev, bus); + + return err; +} + +static int ec_i2c_remove(struct platform_device *dev) +{ + struct ec_i2c_device *bus = platform_get_drvdata(dev); + + i2c_del_adapter(&bus->adap); + + return 0; +} + +static const struct of_device_id cros_ec_i2c_of_match[] = { + { .compatible = "google,cros-ec-i2c-tunnel" }, + {}, +}; +MODULE_DEVICE_TABLE(of, cros_ec_i2c_of_match); + +static const struct acpi_device_id cros_ec_i2c_tunnel_acpi_id[] = { + { "GOOG0012", 0 }, + { } +}; +MODULE_DEVICE_TABLE(acpi, cros_ec_i2c_tunnel_acpi_id); + +static struct platform_driver ec_i2c_tunnel_driver = { + .probe = ec_i2c_probe, + .remove = ec_i2c_remove, + .driver = { + .name = "cros-ec-i2c-tunnel", + .acpi_match_table = ACPI_PTR(cros_ec_i2c_tunnel_acpi_id), + .of_match_table = of_match_ptr(cros_ec_i2c_of_match), + }, +}; + +module_platform_driver(ec_i2c_tunnel_driver); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("EC I2C tunnel driver"); +MODULE_ALIAS("platform:cros-ec-i2c-tunnel"); |