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/gpio/gpio-winbond.c | 733 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 733 insertions(+) create mode 100644 drivers/gpio/gpio-winbond.c (limited to 'drivers/gpio/gpio-winbond.c') diff --git a/drivers/gpio/gpio-winbond.c b/drivers/gpio/gpio-winbond.c new file mode 100644 index 000000000..4b61d975c --- /dev/null +++ b/drivers/gpio/gpio-winbond.c @@ -0,0 +1,733 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * GPIO interface for Winbond Super I/O chips + * Currently, only W83627UHG (Nuvoton NCT6627UD) is supported. + * + * Author: Maciej S. Szmigiero + */ + +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include + +#define WB_GPIO_DRIVER_NAME KBUILD_MODNAME + +#define WB_SIO_BASE 0x2e +#define WB_SIO_BASE_HIGH 0x4e + +#define WB_SIO_EXT_ENTER_KEY 0x87 +#define WB_SIO_EXT_EXIT_KEY 0xaa + +/* global chip registers */ + +#define WB_SIO_REG_LOGICAL 0x07 + +#define WB_SIO_REG_CHIP_MSB 0x20 +#define WB_SIO_REG_CHIP_LSB 0x21 + +#define WB_SIO_CHIP_ID_W83627UHG 0xa230 +#define WB_SIO_CHIP_ID_W83627UHG_MASK GENMASK(15, 4) + +#define WB_SIO_REG_DPD 0x22 +#define WB_SIO_REG_DPD_UARTA 4 +#define WB_SIO_REG_DPD_UARTB 5 + +#define WB_SIO_REG_IDPD 0x23 +#define WB_SIO_REG_IDPD_UARTC 4 +#define WB_SIO_REG_IDPD_UARTD 5 +#define WB_SIO_REG_IDPD_UARTE 6 +#define WB_SIO_REG_IDPD_UARTF 7 + +#define WB_SIO_REG_GLOBAL_OPT 0x24 +#define WB_SIO_REG_GO_ENFDC 1 + +#define WB_SIO_REG_OVTGPIO3456 0x29 +#define WB_SIO_REG_OG3456_G3PP 3 +#define WB_SIO_REG_OG3456_G4PP 4 +#define WB_SIO_REG_OG3456_G5PP 5 +#define WB_SIO_REG_OG3456_G6PP 7 + +#define WB_SIO_REG_I2C_PS 0x2a +#define WB_SIO_REG_I2CPS_I2CFS 1 + +#define WB_SIO_REG_GPIO1_MF 0x2c +#define WB_SIO_REG_G1MF_G1PP 6 +#define WB_SIO_REG_G1MF_G2PP 7 +#define WB_SIO_REG_G1MF_FS_MASK GENMASK(1, 0) +#define WB_SIO_REG_G1MF_FS_IR_OFF 0 +#define WB_SIO_REG_G1MF_FS_IR 1 +#define WB_SIO_REG_G1MF_FS_GPIO1 2 +#define WB_SIO_REG_G1MF_FS_UARTB 3 + +/* not an actual device number, just a value meaning 'no device' */ +#define WB_SIO_DEV_NONE 0xff + +/* registers with offsets >= 0x30 are specific for a particular device */ + +/* UART B logical device */ +#define WB_SIO_DEV_UARTB 0x03 +#define WB_SIO_UARTB_REG_ENABLE 0x30 +#define WB_SIO_UARTB_ENABLE_ON 0 + +/* UART C logical device */ +#define WB_SIO_DEV_UARTC 0x06 +#define WB_SIO_UARTC_REG_ENABLE 0x30 +#define WB_SIO_UARTC_ENABLE_ON 0 + +/* GPIO3, GPIO4 logical device */ +#define WB_SIO_DEV_GPIO34 0x07 +#define WB_SIO_GPIO34_REG_ENABLE 0x30 +#define WB_SIO_GPIO34_ENABLE_3 0 +#define WB_SIO_GPIO34_ENABLE_4 1 +#define WB_SIO_GPIO34_REG_IO3 0xe0 +#define WB_SIO_GPIO34_REG_DATA3 0xe1 +#define WB_SIO_GPIO34_REG_INV3 0xe2 +#define WB_SIO_GPIO34_REG_IO4 0xe4 +#define WB_SIO_GPIO34_REG_DATA4 0xe5 +#define WB_SIO_GPIO34_REG_INV4 0xe6 + +/* WDTO, PLED, GPIO5, GPIO6 logical device */ +#define WB_SIO_DEV_WDGPIO56 0x08 +#define WB_SIO_WDGPIO56_REG_ENABLE 0x30 +#define WB_SIO_WDGPIO56_ENABLE_5 1 +#define WB_SIO_WDGPIO56_ENABLE_6 2 +#define WB_SIO_WDGPIO56_REG_IO5 0xe0 +#define WB_SIO_WDGPIO56_REG_DATA5 0xe1 +#define WB_SIO_WDGPIO56_REG_INV5 0xe2 +#define WB_SIO_WDGPIO56_REG_IO6 0xe4 +#define WB_SIO_WDGPIO56_REG_DATA6 0xe5 +#define WB_SIO_WDGPIO56_REG_INV6 0xe6 + +/* GPIO1, GPIO2, SUSLED logical device */ +#define WB_SIO_DEV_GPIO12 0x09 +#define WB_SIO_GPIO12_REG_ENABLE 0x30 +#define WB_SIO_GPIO12_ENABLE_1 0 +#define WB_SIO_GPIO12_ENABLE_2 1 +#define WB_SIO_GPIO12_REG_IO1 0xe0 +#define WB_SIO_GPIO12_REG_DATA1 0xe1 +#define WB_SIO_GPIO12_REG_INV1 0xe2 +#define WB_SIO_GPIO12_REG_IO2 0xe4 +#define WB_SIO_GPIO12_REG_DATA2 0xe5 +#define WB_SIO_GPIO12_REG_INV2 0xe6 + +/* UART D logical device */ +#define WB_SIO_DEV_UARTD 0x0d +#define WB_SIO_UARTD_REG_ENABLE 0x30 +#define WB_SIO_UARTD_ENABLE_ON 0 + +/* UART E logical device */ +#define WB_SIO_DEV_UARTE 0x0e +#define WB_SIO_UARTE_REG_ENABLE 0x30 +#define WB_SIO_UARTE_ENABLE_ON 0 + +/* + * for a description what a particular field of this struct means please see + * a description of the relevant module parameter at the bottom of this file + */ +struct winbond_gpio_params { + unsigned long base; + unsigned long gpios; + unsigned long ppgpios; + unsigned long odgpios; + bool pledgpio; + bool beepgpio; + bool i2cgpio; +}; + +static struct winbond_gpio_params params; + +static int winbond_sio_enter(unsigned long base) +{ + if (!request_muxed_region(base, 2, WB_GPIO_DRIVER_NAME)) + return -EBUSY; + + /* + * datasheet says two successive writes of the "key" value are needed + * in order for chip to enter the "Extended Function Mode" + */ + outb(WB_SIO_EXT_ENTER_KEY, base); + outb(WB_SIO_EXT_ENTER_KEY, base); + + return 0; +} + +static void winbond_sio_select_logical(unsigned long base, u8 dev) +{ + outb(WB_SIO_REG_LOGICAL, base); + outb(dev, base + 1); +} + +static void winbond_sio_leave(unsigned long base) +{ + outb(WB_SIO_EXT_EXIT_KEY, base); + + release_region(base, 2); +} + +static void winbond_sio_reg_write(unsigned long base, u8 reg, u8 data) +{ + outb(reg, base); + outb(data, base + 1); +} + +static u8 winbond_sio_reg_read(unsigned long base, u8 reg) +{ + outb(reg, base); + return inb(base + 1); +} + +static void winbond_sio_reg_bset(unsigned long base, u8 reg, u8 bit) +{ + u8 val; + + val = winbond_sio_reg_read(base, reg); + val |= BIT(bit); + winbond_sio_reg_write(base, reg, val); +} + +static void winbond_sio_reg_bclear(unsigned long base, u8 reg, u8 bit) +{ + u8 val; + + val = winbond_sio_reg_read(base, reg); + val &= ~BIT(bit); + winbond_sio_reg_write(base, reg, val); +} + +static bool winbond_sio_reg_btest(unsigned long base, u8 reg, u8 bit) +{ + return winbond_sio_reg_read(base, reg) & BIT(bit); +} + +/** + * struct winbond_gpio_port_conflict - possibly conflicting device information + * @name: device name (NULL means no conflicting device defined) + * @dev: Super I/O logical device number where the testreg register + * is located (or WB_SIO_DEV_NONE - don't select any + * logical device) + * @testreg: register number where the testbit bit is located + * @testbit: index of a bit to check whether an actual conflict exists + * @warnonly: if set then a conflict isn't fatal (just warn about it), + * otherwise disable the particular GPIO port if a conflict + * is detected + */ +struct winbond_gpio_port_conflict { + const char *name; + u8 dev; + u8 testreg; + u8 testbit; + bool warnonly; +}; + +/** + * struct winbond_gpio_info - information about a particular GPIO port (device) + * @dev: Super I/O logical device number of the registers + * specified below + * @enablereg: port enable bit register number + * @enablebit: index of a port enable bit + * @outputreg: output driver mode bit register number + * @outputppbit: index of a push-pull output driver mode bit + * @ioreg: data direction register number + * @invreg: pin data inversion register number + * @datareg: pin data register number + * @conflict: description of a device that possibly conflicts with + * this port + */ +struct winbond_gpio_info { + u8 dev; + u8 enablereg; + u8 enablebit; + u8 outputreg; + u8 outputppbit; + u8 ioreg; + u8 invreg; + u8 datareg; + struct winbond_gpio_port_conflict conflict; +}; + +static const struct winbond_gpio_info winbond_gpio_infos[6] = { + { /* 0 */ + .dev = WB_SIO_DEV_GPIO12, + .enablereg = WB_SIO_GPIO12_REG_ENABLE, + .enablebit = WB_SIO_GPIO12_ENABLE_1, + .outputreg = WB_SIO_REG_GPIO1_MF, + .outputppbit = WB_SIO_REG_G1MF_G1PP, + .ioreg = WB_SIO_GPIO12_REG_IO1, + .invreg = WB_SIO_GPIO12_REG_INV1, + .datareg = WB_SIO_GPIO12_REG_DATA1, + .conflict = { + .name = "UARTB", + .dev = WB_SIO_DEV_UARTB, + .testreg = WB_SIO_UARTB_REG_ENABLE, + .testbit = WB_SIO_UARTB_ENABLE_ON, + .warnonly = true + } + }, + { /* 1 */ + .dev = WB_SIO_DEV_GPIO12, + .enablereg = WB_SIO_GPIO12_REG_ENABLE, + .enablebit = WB_SIO_GPIO12_ENABLE_2, + .outputreg = WB_SIO_REG_GPIO1_MF, + .outputppbit = WB_SIO_REG_G1MF_G2PP, + .ioreg = WB_SIO_GPIO12_REG_IO2, + .invreg = WB_SIO_GPIO12_REG_INV2, + .datareg = WB_SIO_GPIO12_REG_DATA2 + /* special conflict handling so doesn't use conflict data */ + }, + { /* 2 */ + .dev = WB_SIO_DEV_GPIO34, + .enablereg = WB_SIO_GPIO34_REG_ENABLE, + .enablebit = WB_SIO_GPIO34_ENABLE_3, + .outputreg = WB_SIO_REG_OVTGPIO3456, + .outputppbit = WB_SIO_REG_OG3456_G3PP, + .ioreg = WB_SIO_GPIO34_REG_IO3, + .invreg = WB_SIO_GPIO34_REG_INV3, + .datareg = WB_SIO_GPIO34_REG_DATA3, + .conflict = { + .name = "UARTC", + .dev = WB_SIO_DEV_UARTC, + .testreg = WB_SIO_UARTC_REG_ENABLE, + .testbit = WB_SIO_UARTC_ENABLE_ON, + .warnonly = true + } + }, + { /* 3 */ + .dev = WB_SIO_DEV_GPIO34, + .enablereg = WB_SIO_GPIO34_REG_ENABLE, + .enablebit = WB_SIO_GPIO34_ENABLE_4, + .outputreg = WB_SIO_REG_OVTGPIO3456, + .outputppbit = WB_SIO_REG_OG3456_G4PP, + .ioreg = WB_SIO_GPIO34_REG_IO4, + .invreg = WB_SIO_GPIO34_REG_INV4, + .datareg = WB_SIO_GPIO34_REG_DATA4, + .conflict = { + .name = "UARTD", + .dev = WB_SIO_DEV_UARTD, + .testreg = WB_SIO_UARTD_REG_ENABLE, + .testbit = WB_SIO_UARTD_ENABLE_ON, + .warnonly = true + } + }, + { /* 4 */ + .dev = WB_SIO_DEV_WDGPIO56, + .enablereg = WB_SIO_WDGPIO56_REG_ENABLE, + .enablebit = WB_SIO_WDGPIO56_ENABLE_5, + .outputreg = WB_SIO_REG_OVTGPIO3456, + .outputppbit = WB_SIO_REG_OG3456_G5PP, + .ioreg = WB_SIO_WDGPIO56_REG_IO5, + .invreg = WB_SIO_WDGPIO56_REG_INV5, + .datareg = WB_SIO_WDGPIO56_REG_DATA5, + .conflict = { + .name = "UARTE", + .dev = WB_SIO_DEV_UARTE, + .testreg = WB_SIO_UARTE_REG_ENABLE, + .testbit = WB_SIO_UARTE_ENABLE_ON, + .warnonly = true + } + }, + { /* 5 */ + .dev = WB_SIO_DEV_WDGPIO56, + .enablereg = WB_SIO_WDGPIO56_REG_ENABLE, + .enablebit = WB_SIO_WDGPIO56_ENABLE_6, + .outputreg = WB_SIO_REG_OVTGPIO3456, + .outputppbit = WB_SIO_REG_OG3456_G6PP, + .ioreg = WB_SIO_WDGPIO56_REG_IO6, + .invreg = WB_SIO_WDGPIO56_REG_INV6, + .datareg = WB_SIO_WDGPIO56_REG_DATA6, + .conflict = { + .name = "FDC", + .dev = WB_SIO_DEV_NONE, + .testreg = WB_SIO_REG_GLOBAL_OPT, + .testbit = WB_SIO_REG_GO_ENFDC, + .warnonly = false + } + } +}; + +/* returns whether changing a pin is allowed */ +static bool winbond_gpio_get_info(unsigned int *gpio_num, + const struct winbond_gpio_info **info) +{ + bool allow_changing = true; + unsigned long i; + + for_each_set_bit(i, ¶ms.gpios, BITS_PER_LONG) { + if (*gpio_num < 8) + break; + + *gpio_num -= 8; + } + + *info = &winbond_gpio_infos[i]; + + /* + * GPIO2 (the second port) shares some pins with a basic PC + * functionality, which is very likely controlled by the firmware. + * Don't allow changing these pins by default. + */ + if (i == 1) { + if (*gpio_num == 0 && !params.pledgpio) + allow_changing = false; + else if (*gpio_num == 1 && !params.beepgpio) + allow_changing = false; + else if ((*gpio_num == 5 || *gpio_num == 6) && !params.i2cgpio) + allow_changing = false; + } + + return allow_changing; +} + +static int winbond_gpio_get(struct gpio_chip *gc, unsigned int offset) +{ + unsigned long *base = gpiochip_get_data(gc); + const struct winbond_gpio_info *info; + bool val; + int ret; + + winbond_gpio_get_info(&offset, &info); + + ret = winbond_sio_enter(*base); + if (ret) + return ret; + + winbond_sio_select_logical(*base, info->dev); + + val = winbond_sio_reg_btest(*base, info->datareg, offset); + if (winbond_sio_reg_btest(*base, info->invreg, offset)) + val = !val; + + winbond_sio_leave(*base); + + return val; +} + +static int winbond_gpio_direction_in(struct gpio_chip *gc, unsigned int offset) +{ + unsigned long *base = gpiochip_get_data(gc); + const struct winbond_gpio_info *info; + int ret; + + if (!winbond_gpio_get_info(&offset, &info)) + return -EACCES; + + ret = winbond_sio_enter(*base); + if (ret) + return ret; + + winbond_sio_select_logical(*base, info->dev); + + winbond_sio_reg_bset(*base, info->ioreg, offset); + + winbond_sio_leave(*base); + + return 0; +} + +static int winbond_gpio_direction_out(struct gpio_chip *gc, + unsigned int offset, + int val) +{ + unsigned long *base = gpiochip_get_data(gc); + const struct winbond_gpio_info *info; + int ret; + + if (!winbond_gpio_get_info(&offset, &info)) + return -EACCES; + + ret = winbond_sio_enter(*base); + if (ret) + return ret; + + winbond_sio_select_logical(*base, info->dev); + + winbond_sio_reg_bclear(*base, info->ioreg, offset); + + if (winbond_sio_reg_btest(*base, info->invreg, offset)) + val = !val; + + if (val) + winbond_sio_reg_bset(*base, info->datareg, offset); + else + winbond_sio_reg_bclear(*base, info->datareg, offset); + + winbond_sio_leave(*base); + + return 0; +} + +static void winbond_gpio_set(struct gpio_chip *gc, unsigned int offset, + int val) +{ + unsigned long *base = gpiochip_get_data(gc); + const struct winbond_gpio_info *info; + + if (!winbond_gpio_get_info(&offset, &info)) + return; + + if (winbond_sio_enter(*base) != 0) + return; + + winbond_sio_select_logical(*base, info->dev); + + if (winbond_sio_reg_btest(*base, info->invreg, offset)) + val = !val; + + if (val) + winbond_sio_reg_bset(*base, info->datareg, offset); + else + winbond_sio_reg_bclear(*base, info->datareg, offset); + + winbond_sio_leave(*base); +} + +static struct gpio_chip winbond_gpio_chip = { + .base = -1, + .label = WB_GPIO_DRIVER_NAME, + .owner = THIS_MODULE, + .can_sleep = true, + .get = winbond_gpio_get, + .direction_input = winbond_gpio_direction_in, + .set = winbond_gpio_set, + .direction_output = winbond_gpio_direction_out, +}; + +static void winbond_gpio_configure_port0_pins(unsigned long base) +{ + unsigned int val; + + val = winbond_sio_reg_read(base, WB_SIO_REG_GPIO1_MF); + if ((val & WB_SIO_REG_G1MF_FS_MASK) == WB_SIO_REG_G1MF_FS_GPIO1) + return; + + pr_warn("GPIO1 pins were connected to something else (%.2x), fixing\n", + val); + + val &= ~WB_SIO_REG_G1MF_FS_MASK; + val |= WB_SIO_REG_G1MF_FS_GPIO1; + + winbond_sio_reg_write(base, WB_SIO_REG_GPIO1_MF, val); +} + +static void winbond_gpio_configure_port1_check_i2c(unsigned long base) +{ + params.i2cgpio = !winbond_sio_reg_btest(base, WB_SIO_REG_I2C_PS, + WB_SIO_REG_I2CPS_I2CFS); + if (!params.i2cgpio) + pr_warn("disabling GPIO2.5 and GPIO2.6 as I2C is enabled\n"); +} + +static bool winbond_gpio_configure_port(unsigned long base, unsigned int idx) +{ + const struct winbond_gpio_info *info = &winbond_gpio_infos[idx]; + const struct winbond_gpio_port_conflict *conflict = &info->conflict; + + /* is there a possible conflicting device defined? */ + if (conflict->name != NULL) { + if (conflict->dev != WB_SIO_DEV_NONE) + winbond_sio_select_logical(base, conflict->dev); + + if (winbond_sio_reg_btest(base, conflict->testreg, + conflict->testbit)) { + if (conflict->warnonly) + pr_warn("enabled GPIO%u share pins with active %s\n", + idx + 1, conflict->name); + else { + pr_warn("disabling GPIO%u as %s is enabled\n", + idx + 1, conflict->name); + return false; + } + } + } + + /* GPIO1 and GPIO2 need some (additional) special handling */ + if (idx == 0) + winbond_gpio_configure_port0_pins(base); + else if (idx == 1) + winbond_gpio_configure_port1_check_i2c(base); + + winbond_sio_select_logical(base, info->dev); + + winbond_sio_reg_bset(base, info->enablereg, info->enablebit); + + if (params.ppgpios & BIT(idx)) + winbond_sio_reg_bset(base, info->outputreg, + info->outputppbit); + else if (params.odgpios & BIT(idx)) + winbond_sio_reg_bclear(base, info->outputreg, + info->outputppbit); + else + pr_notice("GPIO%u pins are %s\n", idx + 1, + winbond_sio_reg_btest(base, info->outputreg, + info->outputppbit) ? + "push-pull" : + "open drain"); + + return true; +} + +static int winbond_gpio_configure(unsigned long base) +{ + unsigned long i; + + for_each_set_bit(i, ¶ms.gpios, BITS_PER_LONG) + if (!winbond_gpio_configure_port(base, i)) + __clear_bit(i, ¶ms.gpios); + + if (!params.gpios) { + pr_err("please use 'gpios' module parameter to select some active GPIO ports to enable\n"); + return -EINVAL; + } + + return 0; +} + +static int winbond_gpio_check_chip(unsigned long base) +{ + int ret; + unsigned int chip; + + ret = winbond_sio_enter(base); + if (ret) + return ret; + + chip = winbond_sio_reg_read(base, WB_SIO_REG_CHIP_MSB) << 8; + chip |= winbond_sio_reg_read(base, WB_SIO_REG_CHIP_LSB); + + pr_notice("chip ID at %lx is %.4x\n", base, chip); + + if ((chip & WB_SIO_CHIP_ID_W83627UHG_MASK) != + WB_SIO_CHIP_ID_W83627UHG) { + pr_err("not an our chip\n"); + ret = -ENODEV; + } + + winbond_sio_leave(base); + + return ret; +} + +static int winbond_gpio_imatch(struct device *dev, unsigned int id) +{ + unsigned long gpios_rem; + int ret; + + gpios_rem = params.gpios & ~GENMASK(ARRAY_SIZE(winbond_gpio_infos) - 1, + 0); + if (gpios_rem) { + pr_warn("unknown ports (%lx) enabled in GPIO ports bitmask\n", + gpios_rem); + params.gpios &= ~gpios_rem; + } + + if (params.ppgpios & params.odgpios) { + pr_err("some GPIO ports are set both to push-pull and open drain mode at the same time\n"); + return 0; + } + + if (params.base != 0) + return winbond_gpio_check_chip(params.base) == 0; + + /* + * if the 'base' module parameter is unset probe two chip default + * I/O port bases + */ + params.base = WB_SIO_BASE; + ret = winbond_gpio_check_chip(params.base); + if (ret == 0) + return 1; + if (ret != -ENODEV && ret != -EBUSY) + return 0; + + params.base = WB_SIO_BASE_HIGH; + return winbond_gpio_check_chip(params.base) == 0; +} + +static int winbond_gpio_iprobe(struct device *dev, unsigned int id) +{ + int ret; + + if (params.base == 0) + return -EINVAL; + + ret = winbond_sio_enter(params.base); + if (ret) + return ret; + + ret = winbond_gpio_configure(params.base); + + winbond_sio_leave(params.base); + + if (ret) + return ret; + + /* + * Add 8 gpios for every GPIO port that was enabled in gpios + * module parameter (that wasn't disabled earlier in + * winbond_gpio_configure() & co. due to, for example, a pin conflict). + */ + winbond_gpio_chip.ngpio = hweight_long(params.gpios) * 8; + + /* + * GPIO6 port has only 5 pins, so if it is enabled we have to adjust + * the total count appropriately + */ + if (params.gpios & BIT(5)) + winbond_gpio_chip.ngpio -= (8 - 5); + + winbond_gpio_chip.parent = dev; + + return devm_gpiochip_add_data(dev, &winbond_gpio_chip, ¶ms.base); +} + +static struct isa_driver winbond_gpio_idriver = { + .driver = { + .name = WB_GPIO_DRIVER_NAME, + }, + .match = winbond_gpio_imatch, + .probe = winbond_gpio_iprobe, +}; + +module_isa_driver(winbond_gpio_idriver, 1); + +module_param_named(base, params.base, ulong, 0444); +MODULE_PARM_DESC(base, + "I/O port base (when unset - probe chip default ones)"); + +/* This parameter sets which GPIO devices (ports) we enable */ +module_param_named(gpios, params.gpios, ulong, 0444); +MODULE_PARM_DESC(gpios, + "bitmask of GPIO ports to enable (bit 0 - GPIO1, bit 1 - GPIO2, etc."); + +/* + * These two parameters below set how we configure GPIO ports output drivers. + * It can't be a one bitmask since we need three values per port: push-pull, + * open-drain and keep as-is (this is the default). + */ +module_param_named(ppgpios, params.ppgpios, ulong, 0444); +MODULE_PARM_DESC(ppgpios, + "bitmask of GPIO ports to set to push-pull mode (bit 0 - GPIO1, bit 1 - GPIO2, etc."); + +module_param_named(odgpios, params.odgpios, ulong, 0444); +MODULE_PARM_DESC(odgpios, + "bitmask of GPIO ports to set to open drain mode (bit 0 - GPIO1, bit 1 - GPIO2, etc."); + +/* + * GPIO2.0 and GPIO2.1 control a basic PC functionality that we + * don't allow tinkering with by default (it is very likely that the + * firmware owns these pins). + * These two parameters below allow overriding these prohibitions. + */ +module_param_named(pledgpio, params.pledgpio, bool, 0644); +MODULE_PARM_DESC(pledgpio, + "enable changing value of GPIO2.0 bit (Power LED), default no."); + +module_param_named(beepgpio, params.beepgpio, bool, 0644); +MODULE_PARM_DESC(beepgpio, + "enable changing value of GPIO2.1 bit (BEEP), default no."); + +MODULE_AUTHOR("Maciej S. Szmigiero "); +MODULE_DESCRIPTION("GPIO interface for Winbond Super I/O chips"); +MODULE_LICENSE("GPL"); -- cgit v1.2.3