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![Finn Thain](/assets/img/avatar_default.png)
As usual, the available documentation is inadequate and leaves endianness
unspecified for message data. However, testing shows that this patch does
improve correctness. The mistake should have been detected earlier but it
was obscured by other bugs. In testing, this patch reinstated pre-v5.9
behaviour. The old driver bugs remain and ADB input devices may stop
working. But that appears to be unrelated.
Cc: Joshua Thompson <funaho@jurai.org>
Fixes: c66da95a39
("macintosh/adb-iop: Implement SRQ autopolling")
Tested-by: Stan Johnson <userm57@yahoo.com>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/r/20210125074524.3027452-1-geert@linux-m68k.org
297 lines
6.3 KiB
C
297 lines
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* I/O Processor (IOP) ADB Driver
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* Written and (C) 1999 by Joshua M. Thompson (funaho@jurai.org)
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* Based on via-cuda.c by Paul Mackerras.
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*
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* 1999-07-01 (jmt) - First implementation for new driver architecture.
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*
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* 1999-07-31 (jmt) - First working version.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/delay.h>
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#include <linux/init.h>
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#include <asm/macintosh.h>
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#include <asm/macints.h>
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#include <asm/mac_iop.h>
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#include <asm/adb_iop.h>
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#include <asm/unaligned.h>
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#include <linux/adb.h>
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static struct adb_request *current_req;
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static struct adb_request *last_req;
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static unsigned int autopoll_devs;
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static u8 autopoll_addr;
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static enum adb_iop_state {
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idle,
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sending,
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awaiting_reply
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} adb_iop_state;
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static void adb_iop_start(void);
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static int adb_iop_probe(void);
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static int adb_iop_init(void);
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static int adb_iop_send_request(struct adb_request *, int);
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static int adb_iop_write(struct adb_request *);
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static int adb_iop_autopoll(int);
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static void adb_iop_poll(void);
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static int adb_iop_reset_bus(void);
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/* ADB command byte structure */
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#define ADDR_MASK 0xF0
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#define OP_MASK 0x0C
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#define TALK 0x0C
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struct adb_driver adb_iop_driver = {
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.name = "ISM IOP",
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.probe = adb_iop_probe,
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.init = adb_iop_init,
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.send_request = adb_iop_send_request,
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.autopoll = adb_iop_autopoll,
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.poll = adb_iop_poll,
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.reset_bus = adb_iop_reset_bus
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};
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static void adb_iop_done(void)
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{
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struct adb_request *req = current_req;
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adb_iop_state = idle;
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req->complete = 1;
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current_req = req->next;
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if (req->done)
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(*req->done)(req);
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if (adb_iop_state == idle)
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adb_iop_start();
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}
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/*
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* Completion routine for ADB commands sent to the IOP.
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*
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* This will be called when a packet has been successfully sent.
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*/
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static void adb_iop_complete(struct iop_msg *msg)
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{
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unsigned long flags;
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local_irq_save(flags);
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adb_iop_state = awaiting_reply;
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local_irq_restore(flags);
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}
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/*
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* Listen for ADB messages from the IOP.
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*
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* This will be called when unsolicited IOP messages are received.
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* These IOP messages can carry ADB autopoll responses and also occur
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* after explicit ADB commands.
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*/
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static void adb_iop_listen(struct iop_msg *msg)
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{
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struct adb_iopmsg *amsg = (struct adb_iopmsg *)msg->message;
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u8 addr = (amsg->cmd & ADDR_MASK) >> 4;
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u8 op = amsg->cmd & OP_MASK;
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unsigned long flags;
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bool req_done = false;
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local_irq_save(flags);
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/* Responses to Talk commands may be unsolicited as they are
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* produced when the IOP polls devices. They are mostly timeouts.
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*/
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if (op == TALK && ((1 << addr) & autopoll_devs))
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autopoll_addr = addr;
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switch (amsg->flags & (ADB_IOP_EXPLICIT |
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ADB_IOP_AUTOPOLL |
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ADB_IOP_TIMEOUT)) {
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case ADB_IOP_EXPLICIT:
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case ADB_IOP_EXPLICIT | ADB_IOP_TIMEOUT:
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if (adb_iop_state == awaiting_reply) {
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struct adb_request *req = current_req;
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if (req->reply_expected) {
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req->reply_len = amsg->count + 1;
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memcpy(req->reply, &amsg->cmd, req->reply_len);
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}
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req_done = true;
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}
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break;
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case ADB_IOP_AUTOPOLL:
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if (((1 << addr) & autopoll_devs) &&
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amsg->cmd == ADB_READREG(addr, 0))
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adb_input(&amsg->cmd, amsg->count + 1, 1);
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break;
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}
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msg->reply[0] = autopoll_addr ? ADB_IOP_AUTOPOLL : 0;
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msg->reply[1] = 0;
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msg->reply[2] = autopoll_addr ? ADB_READREG(autopoll_addr, 0) : 0;
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iop_complete_message(msg);
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if (req_done)
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adb_iop_done();
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local_irq_restore(flags);
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}
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/*
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* Start sending an ADB packet, IOP style
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*
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* There isn't much to do other than hand the packet over to the IOP
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* after encapsulating it in an adb_iopmsg.
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*/
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static void adb_iop_start(void)
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{
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struct adb_request *req;
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struct adb_iopmsg amsg;
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/* get the packet to send */
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req = current_req;
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if (!req)
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return;
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/* The IOP takes MacII-style packets, so strip the initial
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* ADB_PACKET byte.
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*/
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amsg.flags = ADB_IOP_EXPLICIT;
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amsg.count = req->nbytes - 2;
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/* amsg.data immediately follows amsg.cmd, effectively making
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* &amsg.cmd a pointer to the beginning of a full ADB packet.
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*/
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memcpy(&amsg.cmd, req->data + 1, req->nbytes - 1);
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req->sent = 1;
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adb_iop_state = sending;
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/* Now send it. The IOP manager will call adb_iop_complete
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* when the message has been sent.
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*/
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iop_send_message(ADB_IOP, ADB_CHAN, req, sizeof(amsg), (__u8 *)&amsg,
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adb_iop_complete);
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}
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static int adb_iop_probe(void)
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{
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if (!iop_ism_present)
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return -ENODEV;
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return 0;
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}
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static int adb_iop_init(void)
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{
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pr_info("adb: IOP ISM driver v0.4 for Unified ADB\n");
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iop_listen(ADB_IOP, ADB_CHAN, adb_iop_listen, "ADB");
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return 0;
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}
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static int adb_iop_send_request(struct adb_request *req, int sync)
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{
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int err;
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err = adb_iop_write(req);
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if (err)
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return err;
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if (sync) {
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while (!req->complete)
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adb_iop_poll();
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}
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return 0;
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}
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static int adb_iop_write(struct adb_request *req)
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{
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unsigned long flags;
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if ((req->nbytes < 2) || (req->data[0] != ADB_PACKET)) {
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req->complete = 1;
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return -EINVAL;
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}
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req->next = NULL;
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req->sent = 0;
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req->complete = 0;
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req->reply_len = 0;
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local_irq_save(flags);
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if (current_req) {
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last_req->next = req;
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last_req = req;
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} else {
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current_req = req;
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last_req = req;
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}
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if (adb_iop_state == idle)
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adb_iop_start();
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local_irq_restore(flags);
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return 0;
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}
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static void adb_iop_set_ap_complete(struct iop_msg *msg)
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{
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struct adb_iopmsg *amsg = (struct adb_iopmsg *)msg->message;
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autopoll_devs = get_unaligned_be16(amsg->data);
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if (autopoll_devs & (1 << autopoll_addr))
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return;
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autopoll_addr = autopoll_devs ? (ffs(autopoll_devs) - 1) : 0;
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}
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static int adb_iop_autopoll(int devs)
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{
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struct adb_iopmsg amsg;
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unsigned long flags;
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unsigned int mask = (unsigned int)devs & 0xFFFE;
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local_irq_save(flags);
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amsg.flags = ADB_IOP_SET_AUTOPOLL | (mask ? ADB_IOP_AUTOPOLL : 0);
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amsg.count = 2;
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amsg.cmd = 0;
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put_unaligned_be16(mask, amsg.data);
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iop_send_message(ADB_IOP, ADB_CHAN, NULL, sizeof(amsg), (__u8 *)&amsg,
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adb_iop_set_ap_complete);
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local_irq_restore(flags);
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return 0;
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}
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static void adb_iop_poll(void)
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{
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iop_ism_irq_poll(ADB_IOP);
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}
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static int adb_iop_reset_bus(void)
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{
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struct adb_request req;
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/* Command = 0, Address = ignored */
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adb_request(&req, NULL, ADBREQ_NOSEND, 1, ADB_BUSRESET);
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adb_iop_send_request(&req, 1);
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/* Don't want any more requests during the Global Reset low time. */
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mdelay(3);
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return 0;
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}
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