// SPDX-License-Identifier: GPL-2.0 /* * I/O Processor (IOP) ADB Driver * Written and (C) 1999 by Joshua M. Thompson (funaho@jurai.org) * Based on via-cuda.c by Paul Mackerras. * * 1999-07-01 (jmt) - First implementation for new driver architecture. * * 1999-07-31 (jmt) - First working version. * * TODO: * * o Implement SRQ handling. */ #include <linux/types.h> #include <linux/kernel.h> #include <linux/mm.h> #include <linux/delay.h> #include <linux/init.h> #include <linux/proc_fs.h> #include <asm/macintosh.h> #include <asm/macints.h> #include <asm/mac_iop.h> #include <asm/mac_oss.h> #include <asm/adb_iop.h> #include <linux/adb.h> /*#define DEBUG_ADB_IOP*/ static struct adb_request *current_req; static struct adb_request *last_req; #if 0 static unsigned char reply_buff[16]; static unsigned char *reply_ptr; #endif static enum adb_iop_state { idle, sending, awaiting_reply } adb_iop_state; static void adb_iop_start(void); static int adb_iop_probe(void); static int adb_iop_init(void); static int adb_iop_send_request(struct adb_request *, int); static int adb_iop_write(struct adb_request *); static int adb_iop_autopoll(int); static void adb_iop_poll(void); static int adb_iop_reset_bus(void); struct adb_driver adb_iop_driver = { .name = "ISM IOP", .probe = adb_iop_probe, .init = adb_iop_init, .send_request = adb_iop_send_request, .autopoll = adb_iop_autopoll, .poll = adb_iop_poll, .reset_bus = adb_iop_reset_bus }; static void adb_iop_end_req(struct adb_request *req, int state) { req->complete = 1; current_req = req->next; if (req->done) (*req->done)(req); adb_iop_state = state; } /* * Completion routine for ADB commands sent to the IOP. * * This will be called when a packet has been successfully sent. */ static void adb_iop_complete(struct iop_msg *msg) { struct adb_request *req; unsigned long flags; local_irq_save(flags); req = current_req; if ((adb_iop_state == sending) && req && req->reply_expected) { adb_iop_state = awaiting_reply; } local_irq_restore(flags); } /* * Listen for ADB messages from the IOP. * * This will be called when unsolicited messages (usually replies to TALK * commands or autopoll packets) are received. */ static void adb_iop_listen(struct iop_msg *msg) { struct adb_iopmsg *amsg = (struct adb_iopmsg *)msg->message; struct adb_request *req; unsigned long flags; #ifdef DEBUG_ADB_IOP int i; #endif local_irq_save(flags); req = current_req; #ifdef DEBUG_ADB_IOP printk("adb_iop_listen %p: rcvd packet, %d bytes: %02X %02X", req, (uint)amsg->count + 2, (uint)amsg->flags, (uint)amsg->cmd); for (i = 0; i < amsg->count; i++) printk(" %02X", (uint)amsg->data[i]); printk("\n"); #endif /* Handle a timeout. Timeout packets seem to occur even after */ /* we've gotten a valid reply to a TALK, so I'm assuming that */ /* a "timeout" is actually more like an "end-of-data" signal. */ /* We need to send back a timeout packet to the IOP to shut */ /* it up, plus complete the current request, if any. */ if (amsg->flags & ADB_IOP_TIMEOUT) { msg->reply[0] = ADB_IOP_TIMEOUT | ADB_IOP_AUTOPOLL; msg->reply[1] = 0; msg->reply[2] = 0; if (req && (adb_iop_state != idle)) { adb_iop_end_req(req, idle); } } else { /* TODO: is it possible for more than one chunk of data */ /* to arrive before the timeout? If so we need to */ /* use reply_ptr here like the other drivers do. */ if ((adb_iop_state == awaiting_reply) && (amsg->flags & ADB_IOP_EXPLICIT)) { req->reply_len = amsg->count + 1; memcpy(req->reply, &amsg->cmd, req->reply_len); } else { adb_input(&amsg->cmd, amsg->count + 1, amsg->flags & ADB_IOP_AUTOPOLL); } memcpy(msg->reply, msg->message, IOP_MSG_LEN); } iop_complete_message(msg); local_irq_restore(flags); } /* * Start sending an ADB packet, IOP style * * There isn't much to do other than hand the packet over to the IOP * after encapsulating it in an adb_iopmsg. */ static void adb_iop_start(void) { unsigned long flags; struct adb_request *req; struct adb_iopmsg amsg; #ifdef DEBUG_ADB_IOP int i; #endif /* get the packet to send */ req = current_req; if (!req) return; local_irq_save(flags); #ifdef DEBUG_ADB_IOP printk("adb_iop_start %p: sending packet, %d bytes:", req, req->nbytes); for (i = 0; i < req->nbytes; i++) printk(" %02X", (uint)req->data[i]); printk("\n"); #endif /* The IOP takes MacII-style packets, so */ /* strip the initial ADB_PACKET byte. */ amsg.flags = ADB_IOP_EXPLICIT; amsg.count = req->nbytes - 2; /* amsg.data immediately follows amsg.cmd, effectively making */ /* amsg.cmd a pointer to the beginning of a full ADB packet. */ memcpy(&amsg.cmd, req->data + 1, req->nbytes - 1); req->sent = 1; adb_iop_state = sending; local_irq_restore(flags); /* Now send it. The IOP manager will call adb_iop_complete */ /* when the packet has been sent. */ iop_send_message(ADB_IOP, ADB_CHAN, req, sizeof(amsg), (__u8 *)&amsg, adb_iop_complete); } int adb_iop_probe(void) { if (!iop_ism_present) return -ENODEV; return 0; } int adb_iop_init(void) { pr_info("adb: IOP ISM driver v0.4 for Unified ADB\n"); iop_listen(ADB_IOP, ADB_CHAN, adb_iop_listen, "ADB"); return 0; } int adb_iop_send_request(struct adb_request *req, int sync) { int err; err = adb_iop_write(req); if (err) return err; if (sync) { while (!req->complete) adb_iop_poll(); } return 0; } static int adb_iop_write(struct adb_request *req) { unsigned long flags; if ((req->nbytes < 2) || (req->data[0] != ADB_PACKET)) { req->complete = 1; return -EINVAL; } local_irq_save(flags); req->next = NULL; req->sent = 0; req->complete = 0; req->reply_len = 0; if (current_req != 0) { last_req->next = req; last_req = req; } else { current_req = req; last_req = req; } local_irq_restore(flags); if (adb_iop_state == idle) adb_iop_start(); return 0; } int adb_iop_autopoll(int devs) { /* TODO: how do we enable/disable autopoll? */ return 0; } void adb_iop_poll(void) { if (adb_iop_state == idle) adb_iop_start(); iop_ism_irq_poll(ADB_IOP); } int adb_iop_reset_bus(void) { struct adb_request req = { .reply_expected = 0, .nbytes = 2, .data = { ADB_PACKET, 0 }, }; adb_iop_write(&req); while (!req.complete) { adb_iop_poll(); schedule(); } return 0; }