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/parport/ieee1284_ops.c | 893 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 893 insertions(+) create mode 100644 drivers/parport/ieee1284_ops.c (limited to 'drivers/parport/ieee1284_ops.c') diff --git a/drivers/parport/ieee1284_ops.c b/drivers/parport/ieee1284_ops.c new file mode 100644 index 000000000..17061f1df --- /dev/null +++ b/drivers/parport/ieee1284_ops.c @@ -0,0 +1,893 @@ +// SPDX-License-Identifier: GPL-2.0 +/* IEEE-1284 operations for parport. + * + * This file is for generic IEEE 1284 operations. The idea is that + * they are used by the low-level drivers. If they have a special way + * of doing something, they can provide their own routines (and put + * the function pointers in port->ops); if not, they can just use these + * as a fallback. + * + * Note: Make no assumptions about hardware or architecture in this file! + * + * Author: Tim Waugh + * Fixed AUTOFD polarity in ecp_forward_to_reverse(). Fred Barnes, 1999 + * Software emulated EPP fixes, Fred Barnes, 04/2001. + */ + + +#include +#include +#include +#include +#include + +#undef DEBUG /* undef me for production */ + +#ifdef CONFIG_LP_CONSOLE +#undef DEBUG /* Don't want a garbled console */ +#endif + +/*** * + * One-way data transfer functions. * + * ***/ + +/* Compatibility mode. */ +size_t parport_ieee1284_write_compat (struct parport *port, + const void *buffer, size_t len, + int flags) +{ + int no_irq = 1; + ssize_t count = 0; + const unsigned char *addr = buffer; + unsigned char byte; + struct pardevice *dev = port->physport->cad; + unsigned char ctl = (PARPORT_CONTROL_SELECT + | PARPORT_CONTROL_INIT); + + if (port->irq != PARPORT_IRQ_NONE) { + parport_enable_irq (port); + no_irq = 0; + } + + port->physport->ieee1284.phase = IEEE1284_PH_FWD_DATA; + parport_write_control (port, ctl); + parport_data_forward (port); + while (count < len) { + unsigned long expire = jiffies + dev->timeout; + long wait = msecs_to_jiffies(10); + unsigned char mask = (PARPORT_STATUS_ERROR + | PARPORT_STATUS_BUSY); + unsigned char val = (PARPORT_STATUS_ERROR + | PARPORT_STATUS_BUSY); + + /* Wait until the peripheral's ready */ + do { + /* Is the peripheral ready yet? */ + if (!parport_wait_peripheral (port, mask, val)) + /* Skip the loop */ + goto ready; + + /* Is the peripheral upset? */ + if ((parport_read_status (port) & + (PARPORT_STATUS_PAPEROUT | + PARPORT_STATUS_SELECT | + PARPORT_STATUS_ERROR)) + != (PARPORT_STATUS_SELECT | + PARPORT_STATUS_ERROR)) + /* If nFault is asserted (i.e. no + * error) and PAPEROUT and SELECT are + * just red herrings, give the driver + * a chance to check it's happy with + * that before continuing. */ + goto stop; + + /* Have we run out of time? */ + if (!time_before (jiffies, expire)) + break; + + /* Yield the port for a while. If this is the + first time around the loop, don't let go of + the port. This way, we find out if we have + our interrupt handler called. */ + if (count && no_irq) { + parport_release (dev); + schedule_timeout_interruptible(wait); + parport_claim_or_block (dev); + } + else + /* We must have the device claimed here */ + parport_wait_event (port, wait); + + /* Is there a signal pending? */ + if (signal_pending (current)) + break; + + /* Wait longer next time. */ + wait *= 2; + } while (time_before (jiffies, expire)); + + if (signal_pending (current)) + break; + + pr_debug("%s: Timed out\n", port->name); + break; + + ready: + /* Write the character to the data lines. */ + byte = *addr++; + parport_write_data (port, byte); + udelay (1); + + /* Pulse strobe. */ + parport_write_control (port, ctl | PARPORT_CONTROL_STROBE); + udelay (1); /* strobe */ + + parport_write_control (port, ctl); + udelay (1); /* hold */ + + /* Assume the peripheral received it. */ + count++; + + /* Let another process run if it needs to. */ + if (time_before (jiffies, expire)) + if (!parport_yield_blocking (dev) + && need_resched()) + schedule (); + } + stop: + port->physport->ieee1284.phase = IEEE1284_PH_FWD_IDLE; + + return count; +} + +/* Nibble mode. */ +size_t parport_ieee1284_read_nibble (struct parport *port, + void *buffer, size_t len, + int flags) +{ +#ifndef CONFIG_PARPORT_1284 + return 0; +#else + unsigned char *buf = buffer; + int i; + unsigned char byte = 0; + + len *= 2; /* in nibbles */ + for (i=0; i < len; i++) { + unsigned char nibble; + + /* Does the error line indicate end of data? */ + if (((i & 1) == 0) && + (parport_read_status(port) & PARPORT_STATUS_ERROR)) { + goto end_of_data; + } + + /* Event 7: Set nAutoFd low. */ + parport_frob_control (port, + PARPORT_CONTROL_AUTOFD, + PARPORT_CONTROL_AUTOFD); + + /* Event 9: nAck goes low. */ + port->ieee1284.phase = IEEE1284_PH_REV_DATA; + if (parport_wait_peripheral (port, + PARPORT_STATUS_ACK, 0)) { + /* Timeout -- no more data? */ + pr_debug("%s: Nibble timeout at event 9 (%d bytes)\n", + port->name, i / 2); + parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0); + break; + } + + + /* Read a nibble. */ + nibble = parport_read_status (port) >> 3; + nibble &= ~8; + if ((nibble & 0x10) == 0) + nibble |= 8; + nibble &= 0xf; + + /* Event 10: Set nAutoFd high. */ + parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0); + + /* Event 11: nAck goes high. */ + if (parport_wait_peripheral (port, + PARPORT_STATUS_ACK, + PARPORT_STATUS_ACK)) { + /* Timeout -- no more data? */ + pr_debug("%s: Nibble timeout at event 11\n", + port->name); + break; + } + + if (i & 1) { + /* Second nibble */ + byte |= nibble << 4; + *buf++ = byte; + } else + byte = nibble; + } + + if (i == len) { + /* Read the last nibble without checking data avail. */ + if (parport_read_status (port) & PARPORT_STATUS_ERROR) { + end_of_data: + pr_debug("%s: No more nibble data (%d bytes)\n", + port->name, i / 2); + + /* Go to reverse idle phase. */ + parport_frob_control (port, + PARPORT_CONTROL_AUTOFD, + PARPORT_CONTROL_AUTOFD); + port->physport->ieee1284.phase = IEEE1284_PH_REV_IDLE; + } + else + port->physport->ieee1284.phase = IEEE1284_PH_HBUSY_DAVAIL; + } + + return i/2; +#endif /* IEEE1284 support */ +} + +/* Byte mode. */ +size_t parport_ieee1284_read_byte (struct parport *port, + void *buffer, size_t len, + int flags) +{ +#ifndef CONFIG_PARPORT_1284 + return 0; +#else + unsigned char *buf = buffer; + ssize_t count = 0; + + for (count = 0; count < len; count++) { + unsigned char byte; + + /* Data available? */ + if (parport_read_status (port) & PARPORT_STATUS_ERROR) { + goto end_of_data; + } + + /* Event 14: Place data bus in high impedance state. */ + parport_data_reverse (port); + + /* Event 7: Set nAutoFd low. */ + parport_frob_control (port, + PARPORT_CONTROL_AUTOFD, + PARPORT_CONTROL_AUTOFD); + + /* Event 9: nAck goes low. */ + port->physport->ieee1284.phase = IEEE1284_PH_REV_DATA; + if (parport_wait_peripheral (port, + PARPORT_STATUS_ACK, + 0)) { + /* Timeout -- no more data? */ + parport_frob_control (port, PARPORT_CONTROL_AUTOFD, + 0); + pr_debug("%s: Byte timeout at event 9\n", port->name); + break; + } + + byte = parport_read_data (port); + *buf++ = byte; + + /* Event 10: Set nAutoFd high */ + parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0); + + /* Event 11: nAck goes high. */ + if (parport_wait_peripheral (port, + PARPORT_STATUS_ACK, + PARPORT_STATUS_ACK)) { + /* Timeout -- no more data? */ + pr_debug("%s: Byte timeout at event 11\n", port->name); + break; + } + + /* Event 16: Set nStrobe low. */ + parport_frob_control (port, + PARPORT_CONTROL_STROBE, + PARPORT_CONTROL_STROBE); + udelay (5); + + /* Event 17: Set nStrobe high. */ + parport_frob_control (port, PARPORT_CONTROL_STROBE, 0); + } + + if (count == len) { + /* Read the last byte without checking data avail. */ + if (parport_read_status (port) & PARPORT_STATUS_ERROR) { + end_of_data: + pr_debug("%s: No more byte data (%zd bytes)\n", + port->name, count); + + /* Go to reverse idle phase. */ + parport_frob_control (port, + PARPORT_CONTROL_AUTOFD, + PARPORT_CONTROL_AUTOFD); + port->physport->ieee1284.phase = IEEE1284_PH_REV_IDLE; + } + else + port->physport->ieee1284.phase = IEEE1284_PH_HBUSY_DAVAIL; + } + + return count; +#endif /* IEEE1284 support */ +} + +/*** * + * ECP Functions. * + * ***/ + +#ifdef CONFIG_PARPORT_1284 + +static inline +int ecp_forward_to_reverse (struct parport *port) +{ + int retval; + + /* Event 38: Set nAutoFd low */ + parport_frob_control (port, + PARPORT_CONTROL_AUTOFD, + PARPORT_CONTROL_AUTOFD); + parport_data_reverse (port); + udelay (5); + + /* Event 39: Set nInit low to initiate bus reversal */ + parport_frob_control (port, + PARPORT_CONTROL_INIT, + 0); + + /* Event 40: PError goes low */ + retval = parport_wait_peripheral (port, + PARPORT_STATUS_PAPEROUT, 0); + + if (!retval) { + pr_debug("%s: ECP direction: reverse\n", port->name); + port->ieee1284.phase = IEEE1284_PH_REV_IDLE; + } else { + pr_debug("%s: ECP direction: failed to reverse\n", port->name); + port->ieee1284.phase = IEEE1284_PH_ECP_DIR_UNKNOWN; + } + + return retval; +} + +static inline +int ecp_reverse_to_forward (struct parport *port) +{ + int retval; + + /* Event 47: Set nInit high */ + parport_frob_control (port, + PARPORT_CONTROL_INIT + | PARPORT_CONTROL_AUTOFD, + PARPORT_CONTROL_INIT + | PARPORT_CONTROL_AUTOFD); + + /* Event 49: PError goes high */ + retval = parport_wait_peripheral (port, + PARPORT_STATUS_PAPEROUT, + PARPORT_STATUS_PAPEROUT); + + if (!retval) { + parport_data_forward (port); + pr_debug("%s: ECP direction: forward\n", port->name); + port->ieee1284.phase = IEEE1284_PH_FWD_IDLE; + } else { + pr_debug("%s: ECP direction: failed to switch forward\n", + port->name); + port->ieee1284.phase = IEEE1284_PH_ECP_DIR_UNKNOWN; + } + + + return retval; +} + +#endif /* IEEE1284 support */ + +/* ECP mode, forward channel, data. */ +size_t parport_ieee1284_ecp_write_data (struct parport *port, + const void *buffer, size_t len, + int flags) +{ +#ifndef CONFIG_PARPORT_1284 + return 0; +#else + const unsigned char *buf = buffer; + size_t written; + int retry; + + port = port->physport; + + if (port->ieee1284.phase != IEEE1284_PH_FWD_IDLE) + if (ecp_reverse_to_forward (port)) + return 0; + + port->ieee1284.phase = IEEE1284_PH_FWD_DATA; + + /* HostAck high (data, not command) */ + parport_frob_control (port, + PARPORT_CONTROL_AUTOFD + | PARPORT_CONTROL_STROBE + | PARPORT_CONTROL_INIT, + PARPORT_CONTROL_INIT); + for (written = 0; written < len; written++, buf++) { + unsigned long expire = jiffies + port->cad->timeout; + unsigned char byte; + + byte = *buf; + try_again: + parport_write_data (port, byte); + parport_frob_control (port, PARPORT_CONTROL_STROBE, + PARPORT_CONTROL_STROBE); + udelay (5); + for (retry = 0; retry < 100; retry++) { + if (!parport_wait_peripheral (port, + PARPORT_STATUS_BUSY, 0)) + goto success; + + if (signal_pending (current)) { + parport_frob_control (port, + PARPORT_CONTROL_STROBE, + 0); + break; + } + } + + /* Time for Host Transfer Recovery (page 41 of IEEE1284) */ + pr_debug("%s: ECP transfer stalled!\n", port->name); + + parport_frob_control (port, PARPORT_CONTROL_INIT, + PARPORT_CONTROL_INIT); + udelay (50); + if (parport_read_status (port) & PARPORT_STATUS_PAPEROUT) { + /* It's buggered. */ + parport_frob_control (port, PARPORT_CONTROL_INIT, 0); + break; + } + + parport_frob_control (port, PARPORT_CONTROL_INIT, 0); + udelay (50); + if (!(parport_read_status (port) & PARPORT_STATUS_PAPEROUT)) + break; + + pr_debug("%s: Host transfer recovered\n", port->name); + + if (time_after_eq (jiffies, expire)) break; + goto try_again; + success: + parport_frob_control (port, PARPORT_CONTROL_STROBE, 0); + udelay (5); + if (parport_wait_peripheral (port, + PARPORT_STATUS_BUSY, + PARPORT_STATUS_BUSY)) + /* Peripheral hasn't accepted the data. */ + break; + } + + port->ieee1284.phase = IEEE1284_PH_FWD_IDLE; + + return written; +#endif /* IEEE1284 support */ +} + +/* ECP mode, reverse channel, data. */ +size_t parport_ieee1284_ecp_read_data (struct parport *port, + void *buffer, size_t len, int flags) +{ +#ifndef CONFIG_PARPORT_1284 + return 0; +#else + struct pardevice *dev = port->cad; + unsigned char *buf = buffer; + int rle_count = 0; /* shut gcc up */ + unsigned char ctl; + int rle = 0; + ssize_t count = 0; + + port = port->physport; + + if (port->ieee1284.phase != IEEE1284_PH_REV_IDLE) + if (ecp_forward_to_reverse (port)) + return 0; + + port->ieee1284.phase = IEEE1284_PH_REV_DATA; + + /* Set HostAck low to start accepting data. */ + ctl = parport_read_control (port); + ctl &= ~(PARPORT_CONTROL_STROBE | PARPORT_CONTROL_INIT | + PARPORT_CONTROL_AUTOFD); + parport_write_control (port, + ctl | PARPORT_CONTROL_AUTOFD); + while (count < len) { + unsigned long expire = jiffies + dev->timeout; + unsigned char byte; + int command; + + /* Event 43: Peripheral sets nAck low. It can take as + long as it wants. */ + while (parport_wait_peripheral (port, PARPORT_STATUS_ACK, 0)) { + /* The peripheral hasn't given us data in + 35ms. If we have data to give back to the + caller, do it now. */ + if (count) + goto out; + + /* If we've used up all the time we were allowed, + give up altogether. */ + if (!time_before (jiffies, expire)) + goto out; + + /* Yield the port for a while. */ + if (dev->port->irq != PARPORT_IRQ_NONE) { + parport_release (dev); + schedule_timeout_interruptible(msecs_to_jiffies(40)); + parport_claim_or_block (dev); + } + else + /* We must have the device claimed here. */ + parport_wait_event (port, msecs_to_jiffies(40)); + + /* Is there a signal pending? */ + if (signal_pending (current)) + goto out; + } + + /* Is this a command? */ + if (rle) + /* The last byte was a run-length count, so + this can't be as well. */ + command = 0; + else + command = (parport_read_status (port) & + PARPORT_STATUS_BUSY) ? 1 : 0; + + /* Read the data. */ + byte = parport_read_data (port); + + /* If this is a channel command, rather than an RLE + command or a normal data byte, don't accept it. */ + if (command) { + if (byte & 0x80) { + pr_debug("%s: stopping short at channel command (%02x)\n", + port->name, byte); + goto out; + } + else if (port->ieee1284.mode != IEEE1284_MODE_ECPRLE) + pr_debug("%s: device illegally using RLE; accepting anyway\n", + port->name); + + rle_count = byte + 1; + + /* Are we allowed to read that many bytes? */ + if (rle_count > (len - count)) { + pr_debug("%s: leaving %d RLE bytes for next time\n", + port->name, rle_count); + break; + } + + rle = 1; + } + + /* Event 44: Set HostAck high, acknowledging handshake. */ + parport_write_control (port, ctl); + + /* Event 45: The peripheral has 35ms to set nAck high. */ + if (parport_wait_peripheral (port, PARPORT_STATUS_ACK, + PARPORT_STATUS_ACK)) { + /* It's gone wrong. Return what data we have + to the caller. */ + pr_debug("ECP read timed out at 45\n"); + + if (command) + pr_warn("%s: command ignored (%02x)\n", + port->name, byte); + + break; + } + + /* Event 46: Set HostAck low and accept the data. */ + parport_write_control (port, + ctl | PARPORT_CONTROL_AUTOFD); + + /* If we just read a run-length count, fetch the data. */ + if (command) + continue; + + /* If this is the byte after a run-length count, decompress. */ + if (rle) { + rle = 0; + memset (buf, byte, rle_count); + buf += rle_count; + count += rle_count; + pr_debug("%s: decompressed to %d bytes\n", + port->name, rle_count); + } else { + /* Normal data byte. */ + *buf = byte; + buf++, count++; + } + } + + out: + port->ieee1284.phase = IEEE1284_PH_REV_IDLE; + return count; +#endif /* IEEE1284 support */ +} + +/* ECP mode, forward channel, commands. */ +size_t parport_ieee1284_ecp_write_addr (struct parport *port, + const void *buffer, size_t len, + int flags) +{ +#ifndef CONFIG_PARPORT_1284 + return 0; +#else + const unsigned char *buf = buffer; + size_t written; + int retry; + + port = port->physport; + + if (port->ieee1284.phase != IEEE1284_PH_FWD_IDLE) + if (ecp_reverse_to_forward (port)) + return 0; + + port->ieee1284.phase = IEEE1284_PH_FWD_DATA; + + /* HostAck low (command, not data) */ + parport_frob_control (port, + PARPORT_CONTROL_AUTOFD + | PARPORT_CONTROL_STROBE + | PARPORT_CONTROL_INIT, + PARPORT_CONTROL_AUTOFD + | PARPORT_CONTROL_INIT); + for (written = 0; written < len; written++, buf++) { + unsigned long expire = jiffies + port->cad->timeout; + unsigned char byte; + + byte = *buf; + try_again: + parport_write_data (port, byte); + parport_frob_control (port, PARPORT_CONTROL_STROBE, + PARPORT_CONTROL_STROBE); + udelay (5); + for (retry = 0; retry < 100; retry++) { + if (!parport_wait_peripheral (port, + PARPORT_STATUS_BUSY, 0)) + goto success; + + if (signal_pending (current)) { + parport_frob_control (port, + PARPORT_CONTROL_STROBE, + 0); + break; + } + } + + /* Time for Host Transfer Recovery (page 41 of IEEE1284) */ + pr_debug("%s: ECP transfer stalled!\n", port->name); + + parport_frob_control (port, PARPORT_CONTROL_INIT, + PARPORT_CONTROL_INIT); + udelay (50); + if (parport_read_status (port) & PARPORT_STATUS_PAPEROUT) { + /* It's buggered. */ + parport_frob_control (port, PARPORT_CONTROL_INIT, 0); + break; + } + + parport_frob_control (port, PARPORT_CONTROL_INIT, 0); + udelay (50); + if (!(parport_read_status (port) & PARPORT_STATUS_PAPEROUT)) + break; + + pr_debug("%s: Host transfer recovered\n", port->name); + + if (time_after_eq (jiffies, expire)) break; + goto try_again; + success: + parport_frob_control (port, PARPORT_CONTROL_STROBE, 0); + udelay (5); + if (parport_wait_peripheral (port, + PARPORT_STATUS_BUSY, + PARPORT_STATUS_BUSY)) + /* Peripheral hasn't accepted the data. */ + break; + } + + port->ieee1284.phase = IEEE1284_PH_FWD_IDLE; + + return written; +#endif /* IEEE1284 support */ +} + +/*** * + * EPP functions. * + * ***/ + +/* EPP mode, forward channel, data. */ +size_t parport_ieee1284_epp_write_data (struct parport *port, + const void *buffer, size_t len, + int flags) +{ + unsigned char *bp = (unsigned char *) buffer; + size_t ret = 0; + + /* set EPP idle state (just to make sure) with strobe low */ + parport_frob_control (port, + PARPORT_CONTROL_STROBE | + PARPORT_CONTROL_AUTOFD | + PARPORT_CONTROL_SELECT | + PARPORT_CONTROL_INIT, + PARPORT_CONTROL_STROBE | + PARPORT_CONTROL_INIT); + port->ops->data_forward (port); + for (; len > 0; len--, bp++) { + /* Event 62: Write data and set autofd low */ + parport_write_data (port, *bp); + parport_frob_control (port, PARPORT_CONTROL_AUTOFD, + PARPORT_CONTROL_AUTOFD); + + /* Event 58: wait for busy (nWait) to go high */ + if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY, 0, 10)) + break; + + /* Event 63: set nAutoFd (nDStrb) high */ + parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0); + + /* Event 60: wait for busy (nWait) to go low */ + if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY, + PARPORT_STATUS_BUSY, 5)) + break; + + ret++; + } + + /* Event 61: set strobe (nWrite) high */ + parport_frob_control (port, PARPORT_CONTROL_STROBE, 0); + + return ret; +} + +/* EPP mode, reverse channel, data. */ +size_t parport_ieee1284_epp_read_data (struct parport *port, + void *buffer, size_t len, + int flags) +{ + unsigned char *bp = (unsigned char *) buffer; + unsigned ret = 0; + + /* set EPP idle state (just to make sure) with strobe high */ + parport_frob_control (port, + PARPORT_CONTROL_STROBE | + PARPORT_CONTROL_AUTOFD | + PARPORT_CONTROL_SELECT | + PARPORT_CONTROL_INIT, + PARPORT_CONTROL_INIT); + port->ops->data_reverse (port); + for (; len > 0; len--, bp++) { + /* Event 67: set nAutoFd (nDStrb) low */ + parport_frob_control (port, + PARPORT_CONTROL_AUTOFD, + PARPORT_CONTROL_AUTOFD); + /* Event 58: wait for Busy to go high */ + if (parport_wait_peripheral (port, PARPORT_STATUS_BUSY, 0)) { + break; + } + + *bp = parport_read_data (port); + + /* Event 63: set nAutoFd (nDStrb) high */ + parport_frob_control (port, PARPORT_CONTROL_AUTOFD, 0); + + /* Event 60: wait for Busy to go low */ + if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY, + PARPORT_STATUS_BUSY, 5)) { + break; + } + + ret++; + } + port->ops->data_forward (port); + + return ret; +} + +/* EPP mode, forward channel, addresses. */ +size_t parport_ieee1284_epp_write_addr (struct parport *port, + const void *buffer, size_t len, + int flags) +{ + unsigned char *bp = (unsigned char *) buffer; + size_t ret = 0; + + /* set EPP idle state (just to make sure) with strobe low */ + parport_frob_control (port, + PARPORT_CONTROL_STROBE | + PARPORT_CONTROL_AUTOFD | + PARPORT_CONTROL_SELECT | + PARPORT_CONTROL_INIT, + PARPORT_CONTROL_STROBE | + PARPORT_CONTROL_INIT); + port->ops->data_forward (port); + for (; len > 0; len--, bp++) { + /* Event 56: Write data and set nAStrb low. */ + parport_write_data (port, *bp); + parport_frob_control (port, PARPORT_CONTROL_SELECT, + PARPORT_CONTROL_SELECT); + + /* Event 58: wait for busy (nWait) to go high */ + if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY, 0, 10)) + break; + + /* Event 59: set nAStrb high */ + parport_frob_control (port, PARPORT_CONTROL_SELECT, 0); + + /* Event 60: wait for busy (nWait) to go low */ + if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY, + PARPORT_STATUS_BUSY, 5)) + break; + + ret++; + } + + /* Event 61: set strobe (nWrite) high */ + parport_frob_control (port, PARPORT_CONTROL_STROBE, 0); + + return ret; +} + +/* EPP mode, reverse channel, addresses. */ +size_t parport_ieee1284_epp_read_addr (struct parport *port, + void *buffer, size_t len, + int flags) +{ + unsigned char *bp = (unsigned char *) buffer; + unsigned ret = 0; + + /* Set EPP idle state (just to make sure) with strobe high */ + parport_frob_control (port, + PARPORT_CONTROL_STROBE | + PARPORT_CONTROL_AUTOFD | + PARPORT_CONTROL_SELECT | + PARPORT_CONTROL_INIT, + PARPORT_CONTROL_INIT); + port->ops->data_reverse (port); + for (; len > 0; len--, bp++) { + /* Event 64: set nSelectIn (nAStrb) low */ + parport_frob_control (port, PARPORT_CONTROL_SELECT, + PARPORT_CONTROL_SELECT); + + /* Event 58: wait for Busy to go high */ + if (parport_wait_peripheral (port, PARPORT_STATUS_BUSY, 0)) { + break; + } + + *bp = parport_read_data (port); + + /* Event 59: set nSelectIn (nAStrb) high */ + parport_frob_control (port, PARPORT_CONTROL_SELECT, + 0); + + /* Event 60: wait for Busy to go low */ + if (parport_poll_peripheral (port, PARPORT_STATUS_BUSY, + PARPORT_STATUS_BUSY, 5)) + break; + + ret++; + } + port->ops->data_forward (port); + + return ret; +} + +EXPORT_SYMBOL(parport_ieee1284_ecp_write_data); +EXPORT_SYMBOL(parport_ieee1284_ecp_read_data); +EXPORT_SYMBOL(parport_ieee1284_ecp_write_addr); +EXPORT_SYMBOL(parport_ieee1284_write_compat); +EXPORT_SYMBOL(parport_ieee1284_read_nibble); +EXPORT_SYMBOL(parport_ieee1284_read_byte); +EXPORT_SYMBOL(parport_ieee1284_epp_write_data); +EXPORT_SYMBOL(parport_ieee1284_epp_read_data); +EXPORT_SYMBOL(parport_ieee1284_epp_write_addr); +EXPORT_SYMBOL(parport_ieee1284_epp_read_addr); -- cgit v1.2.3