286 lines
6.3 KiB
C
286 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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* TODO:
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*
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* o Implement SRQ handling.
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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 <linux/proc_fs.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/mac_oss.h>
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#include <asm/adb_iop.h>
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#include <linux/adb.h>
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/*#define DEBUG_ADB_IOP*/
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static struct adb_request *current_req;
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static struct adb_request *last_req;
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#if 0
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static unsigned char reply_buff[16];
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static unsigned char *reply_ptr;
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#endif
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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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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_end_req(struct adb_request *req, int state)
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{
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req->complete = 1;
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current_req = req->next;
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if (req->done) (*req->done)(req);
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adb_iop_state = state;
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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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struct adb_request *req;
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unsigned long flags;
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local_irq_save(flags);
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req = current_req;
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if ((adb_iop_state == sending) && req && req->reply_expected) {
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adb_iop_state = awaiting_reply;
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}
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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 messages (usually replies to TALK
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* commands or autopoll packets) are received.
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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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struct adb_request *req;
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unsigned long flags;
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#ifdef DEBUG_ADB_IOP
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int i;
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#endif
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local_irq_save(flags);
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req = current_req;
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#ifdef DEBUG_ADB_IOP
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printk("adb_iop_listen %p: rcvd packet, %d bytes: %02X %02X", req,
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(uint) amsg->count + 2, (uint) amsg->flags, (uint) amsg->cmd);
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for (i = 0; i < amsg->count; i++)
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printk(" %02X", (uint) amsg->data[i]);
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printk("\n");
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#endif
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/* Handle a timeout. Timeout packets seem to occur even after */
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/* we've gotten a valid reply to a TALK, so I'm assuming that */
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/* a "timeout" is actually more like an "end-of-data" signal. */
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/* We need to send back a timeout packet to the IOP to shut */
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/* it up, plus complete the current request, if any. */
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if (amsg->flags & ADB_IOP_TIMEOUT) {
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msg->reply[0] = ADB_IOP_TIMEOUT | ADB_IOP_AUTOPOLL;
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msg->reply[1] = 0;
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msg->reply[2] = 0;
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if (req && (adb_iop_state != idle)) {
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adb_iop_end_req(req, idle);
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}
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} else {
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/* TODO: is it possible for more than one chunk of data */
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/* to arrive before the timeout? If so we need to */
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/* use reply_ptr here like the other drivers do. */
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if ((adb_iop_state == awaiting_reply) &&
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(amsg->flags & ADB_IOP_EXPLICIT)) {
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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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} else {
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adb_input(&amsg->cmd, amsg->count + 1,
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amsg->flags & ADB_IOP_AUTOPOLL);
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}
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memcpy(msg->reply, msg->message, IOP_MSG_LEN);
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}
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iop_complete_message(msg);
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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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unsigned long flags;
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struct adb_request *req;
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struct adb_iopmsg amsg;
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#ifdef DEBUG_ADB_IOP
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int i;
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#endif
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/* get the packet to send */
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req = current_req;
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if (!req) return;
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local_irq_save(flags);
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#ifdef DEBUG_ADB_IOP
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printk("adb_iop_start %p: sending packet, %d bytes:", req, req->nbytes);
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for (i = 0 ; i < req->nbytes ; i++)
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printk(" %02X", (uint) req->data[i]);
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printk("\n");
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#endif
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/* The IOP takes MacII-style packets, so */
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/* strip the initial ADB_PACKET byte. */
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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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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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local_irq_restore(flags);
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/* Now send it. The IOP manager will call adb_iop_complete */
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/* when the packet has been sent. */
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iop_send_message(ADB_IOP, ADB_CHAN, req,
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sizeof(amsg), (__u8 *) &amsg, adb_iop_complete);
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}
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int adb_iop_probe(void)
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{
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if (!iop_ism_present) return -ENODEV;
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return 0;
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}
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int adb_iop_init(void)
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{
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printk("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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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) return err;
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if (sync) {
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while (!req->complete) 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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local_irq_save(flags);
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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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if (current_req != 0) {
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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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local_irq_restore(flags);
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if (adb_iop_state == idle) adb_iop_start();
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return 0;
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}
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int adb_iop_autopoll(int devs)
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{
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/* TODO: how do we enable/disable autopoll? */
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return 0;
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}
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void adb_iop_poll(void)
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{
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if (adb_iop_state == idle) adb_iop_start();
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iop_ism_irq_poll(ADB_IOP);
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}
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int adb_iop_reset_bus(void)
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{
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struct adb_request req = {
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.reply_expected = 0,
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.nbytes = 2,
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.data = { ADB_PACKET, 0 },
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};
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adb_iop_write(&req);
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while (!req.complete) {
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adb_iop_poll();
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schedule();
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}
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return 0;
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}
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