--- /dev/null
+/*
+ * 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*/
+
+extern void iop_ism_irq(int, void *);
+
+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 = {
+ "ISM IOP",
+ adb_iop_probe,
+ adb_iop_init,
+ adb_iop_send_request,
+ adb_iop_autopoll,
+ adb_iop_poll,
+ 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)
+{
+ printk("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(0, (void *) 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;
+}
Code Review / kvmfornfv.git / blobdiff