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/vlynq/vlynq.c | 799 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 799 insertions(+) create mode 100644 drivers/vlynq/vlynq.c (limited to 'drivers/vlynq/vlynq.c') diff --git a/drivers/vlynq/vlynq.c b/drivers/vlynq/vlynq.c new file mode 100644 index 000000000..4af661580 --- /dev/null +++ b/drivers/vlynq/vlynq.c @@ -0,0 +1,799 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2006, 2007 Eugene Konev + * + * Parts of the VLYNQ specification can be found here: + * http://www.ti.com/litv/pdf/sprue36a + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#include + +#define VLYNQ_CTRL_PM_ENABLE 0x80000000 +#define VLYNQ_CTRL_CLOCK_INT 0x00008000 +#define VLYNQ_CTRL_CLOCK_DIV(x) (((x) & 7) << 16) +#define VLYNQ_CTRL_INT_LOCAL 0x00004000 +#define VLYNQ_CTRL_INT_ENABLE 0x00002000 +#define VLYNQ_CTRL_INT_VECTOR(x) (((x) & 0x1f) << 8) +#define VLYNQ_CTRL_INT2CFG 0x00000080 +#define VLYNQ_CTRL_RESET 0x00000001 + +#define VLYNQ_CTRL_CLOCK_MASK (0x7 << 16) + +#define VLYNQ_INT_OFFSET 0x00000014 +#define VLYNQ_REMOTE_OFFSET 0x00000080 + +#define VLYNQ_STATUS_LINK 0x00000001 +#define VLYNQ_STATUS_LERROR 0x00000080 +#define VLYNQ_STATUS_RERROR 0x00000100 + +#define VINT_ENABLE 0x00000100 +#define VINT_TYPE_EDGE 0x00000080 +#define VINT_LEVEL_LOW 0x00000040 +#define VINT_VECTOR(x) ((x) & 0x1f) +#define VINT_OFFSET(irq) (8 * ((irq) % 4)) + +#define VLYNQ_AUTONEGO_V2 0x00010000 + +struct vlynq_regs { + u32 revision; + u32 control; + u32 status; + u32 int_prio; + u32 int_status; + u32 int_pending; + u32 int_ptr; + u32 tx_offset; + struct vlynq_mapping rx_mapping[4]; + u32 chip; + u32 autonego; + u32 unused[6]; + u32 int_device[8]; +}; + +#ifdef CONFIG_VLYNQ_DEBUG +static void vlynq_dump_regs(struct vlynq_device *dev) +{ + int i; + + printk(KERN_DEBUG "VLYNQ local=%p remote=%p\n", + dev->local, dev->remote); + for (i = 0; i < 32; i++) { + printk(KERN_DEBUG "VLYNQ: local %d: %08x\n", + i + 1, ((u32 *)dev->local)[i]); + printk(KERN_DEBUG "VLYNQ: remote %d: %08x\n", + i + 1, ((u32 *)dev->remote)[i]); + } +} + +static void vlynq_dump_mem(u32 *base, int count) +{ + int i; + + for (i = 0; i < (count + 3) / 4; i++) { + if (i % 4 == 0) + printk(KERN_DEBUG "\nMEM[0x%04x]:", i * 4); + printk(KERN_DEBUG " 0x%08x", *(base + i)); + } + printk(KERN_DEBUG "\n"); +} +#endif + +/* Check the VLYNQ link status with a given device */ +static int vlynq_linked(struct vlynq_device *dev) +{ + int i; + + for (i = 0; i < 100; i++) + if (readl(&dev->local->status) & VLYNQ_STATUS_LINK) + return 1; + else + cpu_relax(); + + return 0; +} + +static void vlynq_reset(struct vlynq_device *dev) +{ + writel(readl(&dev->local->control) | VLYNQ_CTRL_RESET, + &dev->local->control); + + /* Wait for the devices to finish resetting */ + msleep(5); + + /* Remove reset bit */ + writel(readl(&dev->local->control) & ~VLYNQ_CTRL_RESET, + &dev->local->control); + + /* Give some time for the devices to settle */ + msleep(5); +} + +static void vlynq_irq_unmask(struct irq_data *d) +{ + struct vlynq_device *dev = irq_data_get_irq_chip_data(d); + int virq; + u32 val; + + BUG_ON(!dev); + virq = d->irq - dev->irq_start; + val = readl(&dev->remote->int_device[virq >> 2]); + val |= (VINT_ENABLE | virq) << VINT_OFFSET(virq); + writel(val, &dev->remote->int_device[virq >> 2]); +} + +static void vlynq_irq_mask(struct irq_data *d) +{ + struct vlynq_device *dev = irq_data_get_irq_chip_data(d); + int virq; + u32 val; + + BUG_ON(!dev); + virq = d->irq - dev->irq_start; + val = readl(&dev->remote->int_device[virq >> 2]); + val &= ~(VINT_ENABLE << VINT_OFFSET(virq)); + writel(val, &dev->remote->int_device[virq >> 2]); +} + +static int vlynq_irq_type(struct irq_data *d, unsigned int flow_type) +{ + struct vlynq_device *dev = irq_data_get_irq_chip_data(d); + int virq; + u32 val; + + BUG_ON(!dev); + virq = d->irq - dev->irq_start; + val = readl(&dev->remote->int_device[virq >> 2]); + switch (flow_type & IRQ_TYPE_SENSE_MASK) { + case IRQ_TYPE_EDGE_RISING: + case IRQ_TYPE_EDGE_FALLING: + case IRQ_TYPE_EDGE_BOTH: + val |= VINT_TYPE_EDGE << VINT_OFFSET(virq); + val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq)); + break; + case IRQ_TYPE_LEVEL_HIGH: + val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq)); + val &= ~(VINT_LEVEL_LOW << VINT_OFFSET(virq)); + break; + case IRQ_TYPE_LEVEL_LOW: + val &= ~(VINT_TYPE_EDGE << VINT_OFFSET(virq)); + val |= VINT_LEVEL_LOW << VINT_OFFSET(virq); + break; + default: + return -EINVAL; + } + writel(val, &dev->remote->int_device[virq >> 2]); + return 0; +} + +static void vlynq_local_ack(struct irq_data *d) +{ + struct vlynq_device *dev = irq_data_get_irq_chip_data(d); + u32 status = readl(&dev->local->status); + + pr_debug("%s: local status: 0x%08x\n", + dev_name(&dev->dev), status); + writel(status, &dev->local->status); +} + +static void vlynq_remote_ack(struct irq_data *d) +{ + struct vlynq_device *dev = irq_data_get_irq_chip_data(d); + u32 status = readl(&dev->remote->status); + + pr_debug("%s: remote status: 0x%08x\n", + dev_name(&dev->dev), status); + writel(status, &dev->remote->status); +} + +static irqreturn_t vlynq_irq(int irq, void *dev_id) +{ + struct vlynq_device *dev = dev_id; + u32 status; + int virq = 0; + + status = readl(&dev->local->int_status); + writel(status, &dev->local->int_status); + + if (unlikely(!status)) + spurious_interrupt(); + + while (status) { + if (status & 1) + do_IRQ(dev->irq_start + virq); + status >>= 1; + virq++; + } + + return IRQ_HANDLED; +} + +static struct irq_chip vlynq_irq_chip = { + .name = "vlynq", + .irq_unmask = vlynq_irq_unmask, + .irq_mask = vlynq_irq_mask, + .irq_set_type = vlynq_irq_type, +}; + +static struct irq_chip vlynq_local_chip = { + .name = "vlynq local error", + .irq_unmask = vlynq_irq_unmask, + .irq_mask = vlynq_irq_mask, + .irq_ack = vlynq_local_ack, +}; + +static struct irq_chip vlynq_remote_chip = { + .name = "vlynq local error", + .irq_unmask = vlynq_irq_unmask, + .irq_mask = vlynq_irq_mask, + .irq_ack = vlynq_remote_ack, +}; + +static int vlynq_setup_irq(struct vlynq_device *dev) +{ + u32 val; + int i, virq; + + if (dev->local_irq == dev->remote_irq) { + printk(KERN_ERR + "%s: local vlynq irq should be different from remote\n", + dev_name(&dev->dev)); + return -EINVAL; + } + + /* Clear local and remote error bits */ + writel(readl(&dev->local->status), &dev->local->status); + writel(readl(&dev->remote->status), &dev->remote->status); + + /* Now setup interrupts */ + val = VLYNQ_CTRL_INT_VECTOR(dev->local_irq); + val |= VLYNQ_CTRL_INT_ENABLE | VLYNQ_CTRL_INT_LOCAL | + VLYNQ_CTRL_INT2CFG; + val |= readl(&dev->local->control); + writel(VLYNQ_INT_OFFSET, &dev->local->int_ptr); + writel(val, &dev->local->control); + + val = VLYNQ_CTRL_INT_VECTOR(dev->remote_irq); + val |= VLYNQ_CTRL_INT_ENABLE; + val |= readl(&dev->remote->control); + writel(VLYNQ_INT_OFFSET, &dev->remote->int_ptr); + writel(val, &dev->remote->int_ptr); + writel(val, &dev->remote->control); + + for (i = dev->irq_start; i <= dev->irq_end; i++) { + virq = i - dev->irq_start; + if (virq == dev->local_irq) { + irq_set_chip_and_handler(i, &vlynq_local_chip, + handle_level_irq); + irq_set_chip_data(i, dev); + } else if (virq == dev->remote_irq) { + irq_set_chip_and_handler(i, &vlynq_remote_chip, + handle_level_irq); + irq_set_chip_data(i, dev); + } else { + irq_set_chip_and_handler(i, &vlynq_irq_chip, + handle_simple_irq); + irq_set_chip_data(i, dev); + writel(0, &dev->remote->int_device[virq >> 2]); + } + } + + if (request_irq(dev->irq, vlynq_irq, IRQF_SHARED, "vlynq", dev)) { + printk(KERN_ERR "%s: request_irq failed\n", + dev_name(&dev->dev)); + return -EAGAIN; + } + + return 0; +} + +static void vlynq_device_release(struct device *dev) +{ + struct vlynq_device *vdev = to_vlynq_device(dev); + kfree(vdev); +} + +static int vlynq_device_match(struct device *dev, + struct device_driver *drv) +{ + struct vlynq_device *vdev = to_vlynq_device(dev); + struct vlynq_driver *vdrv = to_vlynq_driver(drv); + struct vlynq_device_id *ids = vdrv->id_table; + + while (ids->id) { + if (ids->id == vdev->dev_id) { + vdev->divisor = ids->divisor; + vlynq_set_drvdata(vdev, ids); + printk(KERN_INFO "Driver found for VLYNQ " + "device: %08x\n", vdev->dev_id); + return 1; + } + printk(KERN_DEBUG "Not using the %08x VLYNQ device's driver" + " for VLYNQ device: %08x\n", ids->id, vdev->dev_id); + ids++; + } + return 0; +} + +static int vlynq_device_probe(struct device *dev) +{ + struct vlynq_device *vdev = to_vlynq_device(dev); + struct vlynq_driver *drv = to_vlynq_driver(dev->driver); + struct vlynq_device_id *id = vlynq_get_drvdata(vdev); + int result = -ENODEV; + + if (drv->probe) + result = drv->probe(vdev, id); + if (result) + put_device(dev); + return result; +} + +static void vlynq_device_remove(struct device *dev) +{ + struct vlynq_driver *drv = to_vlynq_driver(dev->driver); + + if (drv->remove) + drv->remove(to_vlynq_device(dev)); +} + +int __vlynq_register_driver(struct vlynq_driver *driver, struct module *owner) +{ + driver->driver.name = driver->name; + driver->driver.bus = &vlynq_bus_type; + return driver_register(&driver->driver); +} +EXPORT_SYMBOL(__vlynq_register_driver); + +void vlynq_unregister_driver(struct vlynq_driver *driver) +{ + driver_unregister(&driver->driver); +} +EXPORT_SYMBOL(vlynq_unregister_driver); + +/* + * A VLYNQ remote device can clock the VLYNQ bus master + * using a dedicated clock line. In that case, both the + * remove device and the bus master should have the same + * serial clock dividers configured. Iterate through the + * 8 possible dividers until we actually link with the + * device. + */ +static int __vlynq_try_remote(struct vlynq_device *dev) +{ + int i; + + vlynq_reset(dev); + for (i = dev->dev_id ? vlynq_rdiv2 : vlynq_rdiv8; dev->dev_id ? + i <= vlynq_rdiv8 : i >= vlynq_rdiv2; + dev->dev_id ? i++ : i--) { + + if (!vlynq_linked(dev)) + break; + + writel((readl(&dev->remote->control) & + ~VLYNQ_CTRL_CLOCK_MASK) | + VLYNQ_CTRL_CLOCK_INT | + VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1), + &dev->remote->control); + writel((readl(&dev->local->control) + & ~(VLYNQ_CTRL_CLOCK_INT | + VLYNQ_CTRL_CLOCK_MASK)) | + VLYNQ_CTRL_CLOCK_DIV(i - vlynq_rdiv1), + &dev->local->control); + + if (vlynq_linked(dev)) { + printk(KERN_DEBUG + "%s: using remote clock divisor %d\n", + dev_name(&dev->dev), i - vlynq_rdiv1 + 1); + dev->divisor = i; + return 0; + } else { + vlynq_reset(dev); + } + } + + return -ENODEV; +} + +/* + * A VLYNQ remote device can be clocked by the VLYNQ bus + * master using a dedicated clock line. In that case, only + * the bus master configures the serial clock divider. + * Iterate through the 8 possible dividers until we + * actually get a link with the device. + */ +static int __vlynq_try_local(struct vlynq_device *dev) +{ + int i; + + vlynq_reset(dev); + + for (i = dev->dev_id ? vlynq_ldiv2 : vlynq_ldiv8; dev->dev_id ? + i <= vlynq_ldiv8 : i >= vlynq_ldiv2; + dev->dev_id ? i++ : i--) { + + writel((readl(&dev->local->control) & + ~VLYNQ_CTRL_CLOCK_MASK) | + VLYNQ_CTRL_CLOCK_INT | + VLYNQ_CTRL_CLOCK_DIV(i - vlynq_ldiv1), + &dev->local->control); + + if (vlynq_linked(dev)) { + printk(KERN_DEBUG + "%s: using local clock divisor %d\n", + dev_name(&dev->dev), i - vlynq_ldiv1 + 1); + dev->divisor = i; + return 0; + } else { + vlynq_reset(dev); + } + } + + return -ENODEV; +} + +/* + * When using external clocking method, serial clock + * is supplied by an external oscillator, therefore we + * should mask the local clock bit in the clock control + * register for both the bus master and the remote device. + */ +static int __vlynq_try_external(struct vlynq_device *dev) +{ + vlynq_reset(dev); + if (!vlynq_linked(dev)) + return -ENODEV; + + writel((readl(&dev->remote->control) & + ~VLYNQ_CTRL_CLOCK_INT), + &dev->remote->control); + + writel((readl(&dev->local->control) & + ~VLYNQ_CTRL_CLOCK_INT), + &dev->local->control); + + if (vlynq_linked(dev)) { + printk(KERN_DEBUG "%s: using external clock\n", + dev_name(&dev->dev)); + dev->divisor = vlynq_div_external; + return 0; + } + + return -ENODEV; +} + +static int __vlynq_enable_device(struct vlynq_device *dev) +{ + int result; + struct plat_vlynq_ops *ops = dev->dev.platform_data; + + result = ops->on(dev); + if (result) + return result; + + switch (dev->divisor) { + case vlynq_div_external: + case vlynq_div_auto: + /* When the device is brought from reset it should have clock + * generation negotiated by hardware. + * Check which device is generating clocks and perform setup + * accordingly */ + if (vlynq_linked(dev) && readl(&dev->remote->control) & + VLYNQ_CTRL_CLOCK_INT) { + if (!__vlynq_try_remote(dev) || + !__vlynq_try_local(dev) || + !__vlynq_try_external(dev)) + return 0; + } else { + if (!__vlynq_try_external(dev) || + !__vlynq_try_local(dev) || + !__vlynq_try_remote(dev)) + return 0; + } + break; + case vlynq_ldiv1: + case vlynq_ldiv2: + case vlynq_ldiv3: + case vlynq_ldiv4: + case vlynq_ldiv5: + case vlynq_ldiv6: + case vlynq_ldiv7: + case vlynq_ldiv8: + writel(VLYNQ_CTRL_CLOCK_INT | + VLYNQ_CTRL_CLOCK_DIV(dev->divisor - + vlynq_ldiv1), &dev->local->control); + writel(0, &dev->remote->control); + if (vlynq_linked(dev)) { + printk(KERN_DEBUG + "%s: using local clock divisor %d\n", + dev_name(&dev->dev), + dev->divisor - vlynq_ldiv1 + 1); + return 0; + } + break; + case vlynq_rdiv1: + case vlynq_rdiv2: + case vlynq_rdiv3: + case vlynq_rdiv4: + case vlynq_rdiv5: + case vlynq_rdiv6: + case vlynq_rdiv7: + case vlynq_rdiv8: + writel(0, &dev->local->control); + writel(VLYNQ_CTRL_CLOCK_INT | + VLYNQ_CTRL_CLOCK_DIV(dev->divisor - + vlynq_rdiv1), &dev->remote->control); + if (vlynq_linked(dev)) { + printk(KERN_DEBUG + "%s: using remote clock divisor %d\n", + dev_name(&dev->dev), + dev->divisor - vlynq_rdiv1 + 1); + return 0; + } + break; + } + + ops->off(dev); + return -ENODEV; +} + +int vlynq_enable_device(struct vlynq_device *dev) +{ + struct plat_vlynq_ops *ops = dev->dev.platform_data; + int result = -ENODEV; + + result = __vlynq_enable_device(dev); + if (result) + return result; + + result = vlynq_setup_irq(dev); + if (result) + ops->off(dev); + + dev->enabled = !result; + return result; +} +EXPORT_SYMBOL(vlynq_enable_device); + + +void vlynq_disable_device(struct vlynq_device *dev) +{ + struct plat_vlynq_ops *ops = dev->dev.platform_data; + + dev->enabled = 0; + free_irq(dev->irq, dev); + ops->off(dev); +} +EXPORT_SYMBOL(vlynq_disable_device); + +int vlynq_set_local_mapping(struct vlynq_device *dev, u32 tx_offset, + struct vlynq_mapping *mapping) +{ + int i; + + if (!dev->enabled) + return -ENXIO; + + writel(tx_offset, &dev->local->tx_offset); + for (i = 0; i < 4; i++) { + writel(mapping[i].offset, &dev->local->rx_mapping[i].offset); + writel(mapping[i].size, &dev->local->rx_mapping[i].size); + } + return 0; +} +EXPORT_SYMBOL(vlynq_set_local_mapping); + +int vlynq_set_remote_mapping(struct vlynq_device *dev, u32 tx_offset, + struct vlynq_mapping *mapping) +{ + int i; + + if (!dev->enabled) + return -ENXIO; + + writel(tx_offset, &dev->remote->tx_offset); + for (i = 0; i < 4; i++) { + writel(mapping[i].offset, &dev->remote->rx_mapping[i].offset); + writel(mapping[i].size, &dev->remote->rx_mapping[i].size); + } + return 0; +} +EXPORT_SYMBOL(vlynq_set_remote_mapping); + +int vlynq_set_local_irq(struct vlynq_device *dev, int virq) +{ + int irq = dev->irq_start + virq; + if (dev->enabled) + return -EBUSY; + + if ((irq < dev->irq_start) || (irq > dev->irq_end)) + return -EINVAL; + + if (virq == dev->remote_irq) + return -EINVAL; + + dev->local_irq = virq; + + return 0; +} +EXPORT_SYMBOL(vlynq_set_local_irq); + +int vlynq_set_remote_irq(struct vlynq_device *dev, int virq) +{ + int irq = dev->irq_start + virq; + if (dev->enabled) + return -EBUSY; + + if ((irq < dev->irq_start) || (irq > dev->irq_end)) + return -EINVAL; + + if (virq == dev->local_irq) + return -EINVAL; + + dev->remote_irq = virq; + + return 0; +} +EXPORT_SYMBOL(vlynq_set_remote_irq); + +static int vlynq_probe(struct platform_device *pdev) +{ + struct vlynq_device *dev; + struct resource *regs_res, *mem_res, *irq_res; + int len, result; + + regs_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs"); + if (!regs_res) + return -ENODEV; + + mem_res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "mem"); + if (!mem_res) + return -ENODEV; + + irq_res = platform_get_resource_byname(pdev, IORESOURCE_IRQ, "devirq"); + if (!irq_res) + return -ENODEV; + + dev = kzalloc(sizeof(*dev), GFP_KERNEL); + if (!dev) { + printk(KERN_ERR + "vlynq: failed to allocate device structure\n"); + return -ENOMEM; + } + + dev->id = pdev->id; + dev->dev.bus = &vlynq_bus_type; + dev->dev.parent = &pdev->dev; + dev_set_name(&dev->dev, "vlynq%d", dev->id); + dev->dev.platform_data = pdev->dev.platform_data; + dev->dev.release = vlynq_device_release; + + dev->regs_start = regs_res->start; + dev->regs_end = regs_res->end; + dev->mem_start = mem_res->start; + dev->mem_end = mem_res->end; + + len = resource_size(regs_res); + if (!request_mem_region(regs_res->start, len, dev_name(&dev->dev))) { + printk(KERN_ERR "%s: Can't request vlynq registers\n", + dev_name(&dev->dev)); + result = -ENXIO; + goto fail_request; + } + + dev->local = ioremap(regs_res->start, len); + if (!dev->local) { + printk(KERN_ERR "%s: Can't remap vlynq registers\n", + dev_name(&dev->dev)); + result = -ENXIO; + goto fail_remap; + } + + dev->remote = (struct vlynq_regs *)((void *)dev->local + + VLYNQ_REMOTE_OFFSET); + + dev->irq = platform_get_irq_byname(pdev, "irq"); + dev->irq_start = irq_res->start; + dev->irq_end = irq_res->end; + dev->local_irq = dev->irq_end - dev->irq_start; + dev->remote_irq = dev->local_irq - 1; + + if (device_register(&dev->dev)) + goto fail_register; + platform_set_drvdata(pdev, dev); + + printk(KERN_INFO "%s: regs 0x%p, irq %d, mem 0x%p\n", + dev_name(&dev->dev), (void *)dev->regs_start, dev->irq, + (void *)dev->mem_start); + + dev->dev_id = 0; + dev->divisor = vlynq_div_auto; + result = __vlynq_enable_device(dev); + if (result == 0) { + dev->dev_id = readl(&dev->remote->chip); + ((struct plat_vlynq_ops *)(dev->dev.platform_data))->off(dev); + } + if (dev->dev_id) + printk(KERN_INFO "Found a VLYNQ device: %08x\n", dev->dev_id); + + return 0; + +fail_register: + iounmap(dev->local); +fail_remap: +fail_request: + release_mem_region(regs_res->start, len); + kfree(dev); + return result; +} + +static int vlynq_remove(struct platform_device *pdev) +{ + struct vlynq_device *dev = platform_get_drvdata(pdev); + + device_unregister(&dev->dev); + iounmap(dev->local); + release_mem_region(dev->regs_start, + dev->regs_end - dev->regs_start + 1); + + kfree(dev); + + return 0; +} + +static struct platform_driver vlynq_platform_driver = { + .driver.name = "vlynq", + .probe = vlynq_probe, + .remove = vlynq_remove, +}; + +struct bus_type vlynq_bus_type = { + .name = "vlynq", + .match = vlynq_device_match, + .probe = vlynq_device_probe, + .remove = vlynq_device_remove, +}; +EXPORT_SYMBOL(vlynq_bus_type); + +static int vlynq_init(void) +{ + int res = 0; + + res = bus_register(&vlynq_bus_type); + if (res) + goto fail_bus; + + res = platform_driver_register(&vlynq_platform_driver); + if (res) + goto fail_platform; + + return 0; + +fail_platform: + bus_unregister(&vlynq_bus_type); +fail_bus: + return res; +} + +static void vlynq_exit(void) +{ + platform_driver_unregister(&vlynq_platform_driver); + bus_unregister(&vlynq_bus_type); +} + +module_init(vlynq_init); +module_exit(vlynq_exit); -- cgit v1.2.3