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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /drivers/macintosh/adb-iop.c | |
download | kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'drivers/macintosh/adb-iop.c')
-rw-r--r-- | drivers/macintosh/adb-iop.c | 287 |
1 files changed, 287 insertions, 0 deletions
diff --git a/drivers/macintosh/adb-iop.c b/drivers/macintosh/adb-iop.c new file mode 100644 index 0000000..71aeb91 --- /dev/null +++ b/drivers/macintosh/adb-iop.c @@ -0,0 +1,287 @@ +/* + * 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/bootinfo.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 *, struct pt_regs *); + +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 pt_regs *regs) +{ + struct adb_request *req; + uint 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 pt_regs *regs) +{ + struct adb_iopmsg *amsg = (struct adb_iopmsg *) msg->message; + struct adb_request *req; + uint 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, regs, + 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 = 0; + 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, NULL); +} + +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; +} |