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711 lines
18 KiB
C
711 lines
18 KiB
C
![]() |
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Multifunction core driver for Zodiac Inflight Innovations RAVE
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* Supervisory Processor(SP) MCU that is connected via dedicated UART
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* port
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*
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* Copyright (C) 2017 Zodiac Inflight Innovations
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*/
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#include <linux/atomic.h>
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#include <linux/crc-ccitt.h>
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#include <linux/delay.h>
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#include <linux/export.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/kernel.h>
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#include <linux/mfd/rave-sp.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_device.h>
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#include <linux/sched.h>
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#include <linux/serdev.h>
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#include <asm/unaligned.h>
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/*
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* UART protocol using following entities:
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* - message to MCU => ACK response
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* - event from MCU => event ACK
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*
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* Frame structure:
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* <STX> <DATA> <CHECKSUM> <ETX>
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* Where:
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* - STX - is start of transmission character
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* - ETX - end of transmission
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* - DATA - payload
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* - CHECKSUM - checksum calculated on <DATA>
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*
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* If <DATA> or <CHECKSUM> contain one of control characters, then it is
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* escaped using <DLE> control code. Added <DLE> does not participate in
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* checksum calculation.
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*/
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#define RAVE_SP_STX 0x02
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#define RAVE_SP_ETX 0x03
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#define RAVE_SP_DLE 0x10
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#define RAVE_SP_MAX_DATA_SIZE 64
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#define RAVE_SP_CHECKSUM_SIZE 2 /* Worst case scenario on RDU2 */
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/*
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* We don't store STX, ETX and unescaped bytes, so Rx is only
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* DATA + CSUM
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*/
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#define RAVE_SP_RX_BUFFER_SIZE \
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(RAVE_SP_MAX_DATA_SIZE + RAVE_SP_CHECKSUM_SIZE)
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#define RAVE_SP_STX_ETX_SIZE 2
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/*
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* For Tx we have to have space for everything, STX, EXT and
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* potentially stuffed DATA + CSUM data + csum
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*/
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#define RAVE_SP_TX_BUFFER_SIZE \
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(RAVE_SP_STX_ETX_SIZE + 2 * RAVE_SP_RX_BUFFER_SIZE)
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#define RAVE_SP_BOOT_SOURCE_GET 0
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#define RAVE_SP_BOOT_SOURCE_SET 1
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#define RAVE_SP_RDU2_BOARD_TYPE_RMB 0
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#define RAVE_SP_RDU2_BOARD_TYPE_DEB 1
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#define RAVE_SP_BOOT_SOURCE_SD 0
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#define RAVE_SP_BOOT_SOURCE_EMMC 1
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#define RAVE_SP_BOOT_SOURCE_NOR 2
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/**
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* enum rave_sp_deframer_state - Possible state for de-framer
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*
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* @RAVE_SP_EXPECT_SOF: Scanning input for start-of-frame marker
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* @RAVE_SP_EXPECT_DATA: Got start of frame marker, collecting frame
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* @RAVE_SP_EXPECT_ESCAPED_DATA: Got escape character, collecting escaped byte
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*/
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enum rave_sp_deframer_state {
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RAVE_SP_EXPECT_SOF,
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RAVE_SP_EXPECT_DATA,
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RAVE_SP_EXPECT_ESCAPED_DATA,
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};
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/**
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* struct rave_sp_deframer - Device protocol deframer
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*
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* @state: Current state of the deframer
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* @data: Buffer used to collect deframed data
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* @length: Number of bytes de-framed so far
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*/
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struct rave_sp_deframer {
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enum rave_sp_deframer_state state;
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unsigned char data[RAVE_SP_RX_BUFFER_SIZE];
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size_t length;
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};
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/**
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* struct rave_sp_reply - Reply as per RAVE device protocol
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*
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* @length: Expected reply length
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* @data: Buffer to store reply payload in
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* @code: Expected reply code
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* @ackid: Expected reply ACK ID
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* @completion: Successful reply reception completion
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*/
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struct rave_sp_reply {
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size_t length;
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void *data;
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u8 code;
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u8 ackid;
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struct completion received;
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};
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/**
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* struct rave_sp_checksum - Variant specific checksum implementation details
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*
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* @length: Caculated checksum length
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* @subroutine: Utilized checksum algorithm implementation
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*/
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struct rave_sp_checksum {
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size_t length;
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void (*subroutine)(const u8 *, size_t, u8 *);
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};
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/**
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* struct rave_sp_variant_cmds - Variant specific command routines
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*
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* @translate: Generic to variant specific command mapping routine
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*
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*/
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struct rave_sp_variant_cmds {
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int (*translate)(enum rave_sp_command);
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};
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/**
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* struct rave_sp_variant - RAVE supervisory processor core variant
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*
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* @checksum: Variant specific checksum implementation
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* @cmd: Variant specific command pointer table
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*
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*/
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struct rave_sp_variant {
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const struct rave_sp_checksum *checksum;
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struct rave_sp_variant_cmds cmd;
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};
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/**
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* struct rave_sp - RAVE supervisory processor core
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*
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* @serdev: Pointer to underlying serdev
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* @deframer: Stored state of the protocol deframer
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* @ackid: ACK ID used in last reply sent to the device
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* @bus_lock: Lock to serialize access to the device
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* @reply_lock: Lock protecting @reply
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* @reply: Pointer to memory to store reply payload
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*
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* @variant: Device variant specific information
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* @event_notifier_list: Input event notification chain
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*
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*/
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struct rave_sp {
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struct serdev_device *serdev;
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struct rave_sp_deframer deframer;
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atomic_t ackid;
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struct mutex bus_lock;
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struct mutex reply_lock;
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struct rave_sp_reply *reply;
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const struct rave_sp_variant *variant;
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struct blocking_notifier_head event_notifier_list;
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};
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static bool rave_sp_id_is_event(u8 code)
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{
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return (code & 0xF0) == RAVE_SP_EVNT_BASE;
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}
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static void rave_sp_unregister_event_notifier(struct device *dev, void *res)
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{
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struct rave_sp *sp = dev_get_drvdata(dev->parent);
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struct notifier_block *nb = *(struct notifier_block **)res;
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struct blocking_notifier_head *bnh = &sp->event_notifier_list;
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WARN_ON(blocking_notifier_chain_unregister(bnh, nb));
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}
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int devm_rave_sp_register_event_notifier(struct device *dev,
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struct notifier_block *nb)
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{
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struct rave_sp *sp = dev_get_drvdata(dev->parent);
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struct notifier_block **rcnb;
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int ret;
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rcnb = devres_alloc(rave_sp_unregister_event_notifier,
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sizeof(*rcnb), GFP_KERNEL);
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if (!rcnb)
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return -ENOMEM;
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ret = blocking_notifier_chain_register(&sp->event_notifier_list, nb);
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if (!ret) {
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*rcnb = nb;
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devres_add(dev, rcnb);
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} else {
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devres_free(rcnb);
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}
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return ret;
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}
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EXPORT_SYMBOL_GPL(devm_rave_sp_register_event_notifier);
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static void csum_8b2c(const u8 *buf, size_t size, u8 *crc)
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{
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*crc = *buf++;
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size--;
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while (size--)
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*crc += *buf++;
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*crc = 1 + ~(*crc);
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}
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static void csum_ccitt(const u8 *buf, size_t size, u8 *crc)
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{
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const u16 calculated = crc_ccitt_false(0xffff, buf, size);
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/*
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* While the rest of the wire protocol is little-endian,
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* CCITT-16 CRC in RDU2 device is sent out in big-endian order.
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*/
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put_unaligned_be16(calculated, crc);
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}
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static void *stuff(unsigned char *dest, const unsigned char *src, size_t n)
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{
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while (n--) {
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const unsigned char byte = *src++;
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switch (byte) {
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case RAVE_SP_STX:
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case RAVE_SP_ETX:
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case RAVE_SP_DLE:
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*dest++ = RAVE_SP_DLE;
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/* FALLTHROUGH */
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default:
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*dest++ = byte;
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}
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}
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return dest;
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}
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static int rave_sp_write(struct rave_sp *sp, const u8 *data, u8 data_size)
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{
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const size_t checksum_length = sp->variant->checksum->length;
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unsigned char frame[RAVE_SP_TX_BUFFER_SIZE];
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unsigned char crc[RAVE_SP_CHECKSUM_SIZE];
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unsigned char *dest = frame;
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size_t length;
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if (WARN_ON(checksum_length > sizeof(crc)))
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return -ENOMEM;
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if (WARN_ON(data_size > sizeof(frame)))
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return -ENOMEM;
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sp->variant->checksum->subroutine(data, data_size, crc);
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*dest++ = RAVE_SP_STX;
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dest = stuff(dest, data, data_size);
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dest = stuff(dest, crc, checksum_length);
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*dest++ = RAVE_SP_ETX;
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length = dest - frame;
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print_hex_dump(KERN_DEBUG, "rave-sp tx: ", DUMP_PREFIX_NONE,
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16, 1, frame, length, false);
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return serdev_device_write(sp->serdev, frame, length, HZ);
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}
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static u8 rave_sp_reply_code(u8 command)
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{
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/*
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* There isn't a single rule that describes command code ->
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* ACK code transformation, but, going through various
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* versions of ICDs, there appear to be three distinct groups
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* that can be described by simple transformation.
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*/
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switch (command) {
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case 0xA0 ... 0xBE:
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/*
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* Commands implemented by firmware found in RDU1 and
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* older devices all seem to obey the following rule
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*/
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return command + 0x20;
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case 0xE0 ... 0xEF:
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/*
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* Events emitted by all versions of the firmare use
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* least significant bit to get an ACK code
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*/
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return command | 0x01;
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default:
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/*
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* Commands implemented by firmware found in RDU2 are
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* similar to "old" commands, but they use slightly
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* different offset
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*/
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return command + 0x40;
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}
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}
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int rave_sp_exec(struct rave_sp *sp,
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void *__data, size_t data_size,
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void *reply_data, size_t reply_data_size)
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{
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struct rave_sp_reply reply = {
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.data = reply_data,
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.length = reply_data_size,
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.received = COMPLETION_INITIALIZER_ONSTACK(reply.received),
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};
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unsigned char *data = __data;
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int command, ret = 0;
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u8 ackid;
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command = sp->variant->cmd.translate(data[0]);
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if (command < 0)
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return command;
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ackid = atomic_inc_return(&sp->ackid);
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reply.ackid = ackid;
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reply.code = rave_sp_reply_code((u8)command),
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mutex_lock(&sp->bus_lock);
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mutex_lock(&sp->reply_lock);
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sp->reply = &reply;
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mutex_unlock(&sp->reply_lock);
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data[0] = command;
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data[1] = ackid;
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rave_sp_write(sp, data, data_size);
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if (!wait_for_completion_timeout(&reply.received, HZ)) {
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dev_err(&sp->serdev->dev, "Command timeout\n");
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ret = -ETIMEDOUT;
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mutex_lock(&sp->reply_lock);
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sp->reply = NULL;
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mutex_unlock(&sp->reply_lock);
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}
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mutex_unlock(&sp->bus_lock);
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return ret;
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}
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EXPORT_SYMBOL_GPL(rave_sp_exec);
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static void rave_sp_receive_event(struct rave_sp *sp,
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const unsigned char *data, size_t length)
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{
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u8 cmd[] = {
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[0] = rave_sp_reply_code(data[0]),
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[1] = data[1],
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};
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rave_sp_write(sp, cmd, sizeof(cmd));
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blocking_notifier_call_chain(&sp->event_notifier_list,
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rave_sp_action_pack(data[0], data[2]),
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NULL);
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}
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static void rave_sp_receive_reply(struct rave_sp *sp,
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const unsigned char *data, size_t length)
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{
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struct device *dev = &sp->serdev->dev;
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struct rave_sp_reply *reply;
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const size_t payload_length = length - 2;
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mutex_lock(&sp->reply_lock);
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reply = sp->reply;
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if (reply) {
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if (reply->code == data[0] && reply->ackid == data[1] &&
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payload_length >= reply->length) {
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/*
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* We are relying on memcpy(dst, src, 0) to be a no-op
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* when handling commands that have a no-payload reply
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*/
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memcpy(reply->data, &data[2], reply->length);
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complete(&reply->received);
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sp->reply = NULL;
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} else {
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dev_err(dev, "Ignoring incorrect reply\n");
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dev_dbg(dev, "Code: expected = 0x%08x received = 0x%08x\n",
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reply->code, data[0]);
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dev_dbg(dev, "ACK ID: expected = 0x%08x received = 0x%08x\n",
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reply->ackid, data[1]);
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dev_dbg(dev, "Length: expected = %zu received = %zu\n",
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reply->length, payload_length);
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}
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}
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mutex_unlock(&sp->reply_lock);
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}
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static void rave_sp_receive_frame(struct rave_sp *sp,
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const unsigned char *data,
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size_t length)
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{
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const size_t checksum_length = sp->variant->checksum->length;
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const size_t payload_length = length - checksum_length;
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const u8 *crc_reported = &data[payload_length];
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struct device *dev = &sp->serdev->dev;
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u8 crc_calculated[checksum_length];
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print_hex_dump(KERN_DEBUG, "rave-sp rx: ", DUMP_PREFIX_NONE,
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16, 1, data, length, false);
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if (unlikely(length <= checksum_length)) {
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dev_warn(dev, "Dropping short frame\n");
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return;
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}
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sp->variant->checksum->subroutine(data, payload_length,
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crc_calculated);
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if (memcmp(crc_calculated, crc_reported, checksum_length)) {
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dev_warn(dev, "Dropping bad frame\n");
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return;
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}
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|
if (rave_sp_id_is_event(data[0]))
|
||
|
rave_sp_receive_event(sp, data, length);
|
||
|
else
|
||
|
rave_sp_receive_reply(sp, data, length);
|
||
|
}
|
||
|
|
||
|
static int rave_sp_receive_buf(struct serdev_device *serdev,
|
||
|
const unsigned char *buf, size_t size)
|
||
|
{
|
||
|
struct device *dev = &serdev->dev;
|
||
|
struct rave_sp *sp = dev_get_drvdata(dev);
|
||
|
struct rave_sp_deframer *deframer = &sp->deframer;
|
||
|
const unsigned char *src = buf;
|
||
|
const unsigned char *end = buf + size;
|
||
|
|
||
|
while (src < end) {
|
||
|
const unsigned char byte = *src++;
|
||
|
|
||
|
switch (deframer->state) {
|
||
|
case RAVE_SP_EXPECT_SOF:
|
||
|
if (byte == RAVE_SP_STX)
|
||
|
deframer->state = RAVE_SP_EXPECT_DATA;
|
||
|
break;
|
||
|
|
||
|
case RAVE_SP_EXPECT_DATA:
|
||
|
/*
|
||
|
* Treat special byte values first
|
||
|
*/
|
||
|
switch (byte) {
|
||
|
case RAVE_SP_ETX:
|
||
|
rave_sp_receive_frame(sp,
|
||
|
deframer->data,
|
||
|
deframer->length);
|
||
|
/*
|
||
|
* Once we extracted a complete frame
|
||
|
* out of a stream, we call it done
|
||
|
* and proceed to bailing out while
|
||
|
* resetting the framer to initial
|
||
|
* state, regardless if we've consumed
|
||
|
* all of the stream or not.
|
||
|
*/
|
||
|
goto reset_framer;
|
||
|
case RAVE_SP_STX:
|
||
|
dev_warn(dev, "Bad frame: STX before ETX\n");
|
||
|
/*
|
||
|
* If we encounter second "start of
|
||
|
* the frame" marker before seeing
|
||
|
* corresponding "end of frame", we
|
||
|
* reset the framer and ignore both:
|
||
|
* frame started by first SOF and
|
||
|
* frame started by current SOF.
|
||
|
*
|
||
|
* NOTE: The above means that only the
|
||
|
* frame started by third SOF, sent
|
||
|
* after this one will have a chance
|
||
|
* to get throught.
|
||
|
*/
|
||
|
goto reset_framer;
|
||
|
case RAVE_SP_DLE:
|
||
|
deframer->state = RAVE_SP_EXPECT_ESCAPED_DATA;
|
||
|
/*
|
||
|
* If we encounter escape sequence we
|
||
|
* need to skip it and collect the
|
||
|
* byte that follows. We do it by
|
||
|
* forcing the next iteration of the
|
||
|
* encompassing while loop.
|
||
|
*/
|
||
|
continue;
|
||
|
}
|
||
|
/*
|
||
|
* For the rest of the bytes, that are not
|
||
|
* speical snoflakes, we do the same thing
|
||
|
* that we do to escaped data - collect it in
|
||
|
* deframer buffer
|
||
|
*/
|
||
|
|
||
|
/* FALLTHROUGH */
|
||
|
|
||
|
case RAVE_SP_EXPECT_ESCAPED_DATA:
|
||
|
deframer->data[deframer->length++] = byte;
|
||
|
|
||
|
if (deframer->length == sizeof(deframer->data)) {
|
||
|
dev_warn(dev, "Bad frame: Too long\n");
|
||
|
/*
|
||
|
* If the amount of data we've
|
||
|
* accumulated for current frame so
|
||
|
* far starts to exceed the capacity
|
||
|
* of deframer's buffer, there's
|
||
|
* nothing else we can do but to
|
||
|
* discard that data and start
|
||
|
* assemblying a new frame again
|
||
|
*/
|
||
|
goto reset_framer;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* We've extracted out special byte, now we
|
||
|
* can go back to regular data collecting
|
||
|
*/
|
||
|
deframer->state = RAVE_SP_EXPECT_DATA;
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* The only way to get out of the above loop and end up here
|
||
|
* is throught consuming all of the supplied data, so here we
|
||
|
* report that we processed it all.
|
||
|
*/
|
||
|
return size;
|
||
|
|
||
|
reset_framer:
|
||
|
/*
|
||
|
* NOTE: A number of codepaths that will drop us here will do
|
||
|
* so before consuming all 'size' bytes of the data passed by
|
||
|
* serdev layer. We rely on the fact that serdev layer will
|
||
|
* re-execute this handler with the remainder of the Rx bytes
|
||
|
* once we report actual number of bytes that we processed.
|
||
|
*/
|
||
|
deframer->state = RAVE_SP_EXPECT_SOF;
|
||
|
deframer->length = 0;
|
||
|
|
||
|
return src - buf;
|
||
|
}
|
||
|
|
||
|
static int rave_sp_rdu1_cmd_translate(enum rave_sp_command command)
|
||
|
{
|
||
|
if (command >= RAVE_SP_CMD_STATUS &&
|
||
|
command <= RAVE_SP_CMD_CONTROL_EVENTS)
|
||
|
return command;
|
||
|
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
static int rave_sp_rdu2_cmd_translate(enum rave_sp_command command)
|
||
|
{
|
||
|
if (command >= RAVE_SP_CMD_GET_FIRMWARE_VERSION &&
|
||
|
command <= RAVE_SP_CMD_GET_GPIO_STATE)
|
||
|
return command;
|
||
|
|
||
|
if (command == RAVE_SP_CMD_REQ_COPPER_REV) {
|
||
|
/*
|
||
|
* As per RDU2 ICD 3.4.47 CMD_GET_COPPER_REV code is
|
||
|
* different from that for RDU1 and it is set to 0x28.
|
||
|
*/
|
||
|
return 0x28;
|
||
|
}
|
||
|
|
||
|
return rave_sp_rdu1_cmd_translate(command);
|
||
|
}
|
||
|
|
||
|
static int rave_sp_default_cmd_translate(enum rave_sp_command command)
|
||
|
{
|
||
|
/*
|
||
|
* All of the following command codes were taken from "Table :
|
||
|
* Communications Protocol Message Types" in section 3.3
|
||
|
* "MESSAGE TYPES" of Rave PIC24 ICD.
|
||
|
*/
|
||
|
switch (command) {
|
||
|
case RAVE_SP_CMD_GET_FIRMWARE_VERSION:
|
||
|
return 0x11;
|
||
|
case RAVE_SP_CMD_GET_BOOTLOADER_VERSION:
|
||
|
return 0x12;
|
||
|
case RAVE_SP_CMD_BOOT_SOURCE:
|
||
|
return 0x14;
|
||
|
case RAVE_SP_CMD_SW_WDT:
|
||
|
return 0x1C;
|
||
|
case RAVE_SP_CMD_RESET:
|
||
|
return 0x1E;
|
||
|
case RAVE_SP_CMD_RESET_REASON:
|
||
|
return 0x1F;
|
||
|
default:
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static const struct rave_sp_checksum rave_sp_checksum_8b2c = {
|
||
|
.length = 1,
|
||
|
.subroutine = csum_8b2c,
|
||
|
};
|
||
|
|
||
|
static const struct rave_sp_checksum rave_sp_checksum_ccitt = {
|
||
|
.length = 2,
|
||
|
.subroutine = csum_ccitt,
|
||
|
};
|
||
|
|
||
|
static const struct rave_sp_variant rave_sp_legacy = {
|
||
|
.checksum = &rave_sp_checksum_8b2c,
|
||
|
.cmd = {
|
||
|
.translate = rave_sp_default_cmd_translate,
|
||
|
},
|
||
|
};
|
||
|
|
||
|
static const struct rave_sp_variant rave_sp_rdu1 = {
|
||
|
.checksum = &rave_sp_checksum_8b2c,
|
||
|
.cmd = {
|
||
|
.translate = rave_sp_rdu1_cmd_translate,
|
||
|
},
|
||
|
};
|
||
|
|
||
|
static const struct rave_sp_variant rave_sp_rdu2 = {
|
||
|
.checksum = &rave_sp_checksum_ccitt,
|
||
|
.cmd = {
|
||
|
.translate = rave_sp_rdu2_cmd_translate,
|
||
|
},
|
||
|
};
|
||
|
|
||
|
static const struct of_device_id rave_sp_dt_ids[] = {
|
||
|
{ .compatible = "zii,rave-sp-niu", .data = &rave_sp_legacy },
|
||
|
{ .compatible = "zii,rave-sp-mezz", .data = &rave_sp_legacy },
|
||
|
{ .compatible = "zii,rave-sp-esb", .data = &rave_sp_legacy },
|
||
|
{ .compatible = "zii,rave-sp-rdu1", .data = &rave_sp_rdu1 },
|
||
|
{ .compatible = "zii,rave-sp-rdu2", .data = &rave_sp_rdu2 },
|
||
|
{ /* sentinel */ }
|
||
|
};
|
||
|
|
||
|
static const struct serdev_device_ops rave_sp_serdev_device_ops = {
|
||
|
.receive_buf = rave_sp_receive_buf,
|
||
|
.write_wakeup = serdev_device_write_wakeup,
|
||
|
};
|
||
|
|
||
|
static int rave_sp_probe(struct serdev_device *serdev)
|
||
|
{
|
||
|
struct device *dev = &serdev->dev;
|
||
|
struct rave_sp *sp;
|
||
|
u32 baud;
|
||
|
int ret;
|
||
|
|
||
|
if (of_property_read_u32(dev->of_node, "current-speed", &baud)) {
|
||
|
dev_err(dev,
|
||
|
"'current-speed' is not specified in device node\n");
|
||
|
return -EINVAL;
|
||
|
}
|
||
|
|
||
|
sp = devm_kzalloc(dev, sizeof(*sp), GFP_KERNEL);
|
||
|
if (!sp)
|
||
|
return -ENOMEM;
|
||
|
|
||
|
sp->serdev = serdev;
|
||
|
dev_set_drvdata(dev, sp);
|
||
|
|
||
|
sp->variant = of_device_get_match_data(dev);
|
||
|
if (!sp->variant)
|
||
|
return -ENODEV;
|
||
|
|
||
|
mutex_init(&sp->bus_lock);
|
||
|
mutex_init(&sp->reply_lock);
|
||
|
BLOCKING_INIT_NOTIFIER_HEAD(&sp->event_notifier_list);
|
||
|
|
||
|
serdev_device_set_client_ops(serdev, &rave_sp_serdev_device_ops);
|
||
|
ret = devm_serdev_device_open(dev, serdev);
|
||
|
if (ret)
|
||
|
return ret;
|
||
|
|
||
|
serdev_device_set_baudrate(serdev, baud);
|
||
|
|
||
|
return devm_of_platform_populate(dev);
|
||
|
}
|
||
|
|
||
|
MODULE_DEVICE_TABLE(of, rave_sp_dt_ids);
|
||
|
|
||
|
static struct serdev_device_driver rave_sp_drv = {
|
||
|
.probe = rave_sp_probe,
|
||
|
.driver = {
|
||
|
.name = "rave-sp",
|
||
|
.of_match_table = rave_sp_dt_ids,
|
||
|
},
|
||
|
};
|
||
|
module_serdev_device_driver(rave_sp_drv);
|
||
|
|
||
|
MODULE_LICENSE("GPL");
|
||
|
MODULE_AUTHOR("Andrey Vostrikov <andrey.vostrikov@cogentembedded.com>");
|
||
|
MODULE_AUTHOR("Nikita Yushchenko <nikita.yoush@cogentembedded.com>");
|
||
|
MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
|
||
|
MODULE_DESCRIPTION("RAVE SP core driver");
|