Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * I/O Processor (IOP) management |
| 3 | * Written and (C) 1999 by Joshua M. Thompson (funaho@jurai.org) |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice and this list of conditions. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice and this list of conditions in the documentation and/or other |
| 12 | * materials provided with the distribution. |
| 13 | */ |
| 14 | |
| 15 | /* |
| 16 | * The IOP chips are used in the IIfx and some Quadras (900, 950) to manage |
| 17 | * serial and ADB. They are actually a 6502 processor and some glue logic. |
| 18 | * |
| 19 | * 990429 (jmt) - Initial implementation, just enough to knock the SCC IOP |
| 20 | * into compatible mode so nobody has to fiddle with the |
| 21 | * Serial Switch control panel anymore. |
| 22 | * 990603 (jmt) - Added code to grab the correct ISM IOP interrupt for OSS |
| 23 | * and non-OSS machines (at least I hope it's correct on a |
| 24 | * non-OSS machine -- someone with a Q900 or Q950 needs to |
| 25 | * check this.) |
| 26 | * 990605 (jmt) - Rearranged things a bit wrt IOP detection; iop_present is |
| 27 | * gone, IOP base addresses are now in an array and the |
| 28 | * globally-visible functions take an IOP number instead of an |
| 29 | * an actual base address. |
| 30 | * 990610 (jmt) - Finished the message passing framework and it seems to work. |
| 31 | * Sending _definitely_ works; my adb-bus.c mods can send |
| 32 | * messages and receive the MSG_COMPLETED status back from the |
| 33 | * IOP. The trick now is figuring out the message formats. |
| 34 | * 990611 (jmt) - More cleanups. Fixed problem where unclaimed messages on a |
| 35 | * receive channel were never properly acknowledged. Bracketed |
| 36 | * the remaining debug printk's with #ifdef's and disabled |
| 37 | * debugging. I can now type on the console. |
| 38 | * 990612 (jmt) - Copyright notice added. Reworked the way replies are handled. |
| 39 | * It turns out that replies are placed back in the send buffer |
| 40 | * for that channel; messages on the receive channels are always |
| 41 | * unsolicited messages from the IOP (and our replies to them |
| 42 | * should go back in the receive channel.) Also added tracking |
| 43 | * of device names to the listener functions ala the interrupt |
| 44 | * handlers. |
| 45 | * 990729 (jmt) - Added passing of pt_regs structure to IOP handlers. This is |
| 46 | * used by the new unified ADB driver. |
| 47 | * |
| 48 | * TODO: |
| 49 | * |
| 50 | * o Something should be periodically checking iop_alive() to make sure the |
| 51 | * IOP hasn't died. |
| 52 | * o Some of the IOP manager routines need better error checking and |
| 53 | * return codes. Nothing major, just prettying up. |
| 54 | */ |
| 55 | |
| 56 | /* |
| 57 | * ----------------------- |
| 58 | * IOP Message Passing 101 |
| 59 | * ----------------------- |
| 60 | * |
| 61 | * The host talks to the IOPs using a rather simple message-passing scheme via |
| 62 | * a shared memory area in the IOP RAM. Each IOP has seven "channels"; each |
| 63 | * channel is conneced to a specific software driver on the IOP. For example |
| 64 | * on the SCC IOP there is one channel for each serial port. Each channel has |
| 65 | * an incoming and and outgoing message queue with a depth of one. |
| 66 | * |
| 67 | * A message is 32 bytes plus a state byte for the channel (MSG_IDLE, MSG_NEW, |
| 68 | * MSG_RCVD, MSG_COMPLETE). To send a message you copy the message into the |
| 69 | * buffer, set the state to MSG_NEW and signal the IOP by setting the IRQ flag |
| 70 | * in the IOP control to 1. The IOP will move the state to MSG_RCVD when it |
| 71 | * receives the message and then to MSG_COMPLETE when the message processing |
| 72 | * has completed. It is the host's responsibility at that point to read the |
| 73 | * reply back out of the send channel buffer and reset the channel state back |
| 74 | * to MSG_IDLE. |
| 75 | * |
| 76 | * To receive message from the IOP the same procedure is used except the roles |
| 77 | * are reversed. That is, the IOP puts message in the channel with a state of |
| 78 | * MSG_NEW, and the host receives the message and move its state to MSG_RCVD |
| 79 | * and then to MSG_COMPLETE when processing is completed and the reply (if any) |
| 80 | * has been placed back in the receive channel. The IOP will then reset the |
| 81 | * channel state to MSG_IDLE. |
| 82 | * |
| 83 | * Two sets of host interrupts are provided, INT0 and INT1. Both appear on one |
| 84 | * interrupt level; they are distinguished by a pair of bits in the IOP status |
| 85 | * register. The IOP will raise INT0 when one or more messages in the send |
| 86 | * channels have gone to the MSG_COMPLETE state and it will raise INT1 when one |
| 87 | * or more messages on the receive channels have gone to the MSG_NEW state. |
| 88 | * |
| 89 | * Since each channel handles only one message we have to implement a small |
| 90 | * interrupt-driven queue on our end. Messages to be sent are placed on the |
| 91 | * queue for sending and contain a pointer to an optional callback function. |
| 92 | * The handler for a message is called when the message state goes to |
| 93 | * MSG_COMPLETE. |
| 94 | * |
| 95 | * For receiving message we maintain a list of handler functions to call when |
| 96 | * a message is received on that IOP/channel combination. The handlers are |
| 97 | * called much like an interrupt handler and are passed a copy of the message |
| 98 | * from the IOP. The message state will be in MSG_RCVD while the handler runs; |
| 99 | * it is the handler's responsibility to call iop_complete_message() when |
| 100 | * finished; this function moves the message state to MSG_COMPLETE and signals |
| 101 | * the IOP. This two-step process is provided to allow the handler to defer |
| 102 | * message processing to a bottom-half handler if the processing will take |
Simon Arlott | 0c79cf6 | 2007-10-20 01:20:32 +0200 | [diff] [blame] | 103 | * a significant amount of time (handlers are called at interrupt time so they |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | * should execute quickly.) |
| 105 | */ |
| 106 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | #include <linux/types.h> |
| 108 | #include <linux/kernel.h> |
| 109 | #include <linux/mm.h> |
| 110 | #include <linux/delay.h> |
| 111 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | #include <linux/interrupt.h> |
| 113 | |
| 114 | #include <asm/bootinfo.h> |
| 115 | #include <asm/macintosh.h> |
| 116 | #include <asm/macints.h> |
| 117 | #include <asm/mac_iop.h> |
| 118 | #include <asm/mac_oss.h> |
| 119 | |
| 120 | /*#define DEBUG_IOP*/ |
| 121 | |
Simon Arlott | 0c79cf6 | 2007-10-20 01:20:32 +0200 | [diff] [blame] | 122 | /* Set to non-zero if the IOPs are present. Set by iop_init() */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | |
| 124 | int iop_scc_present,iop_ism_present; |
| 125 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | /* structure for tracking channel listeners */ |
| 127 | |
| 128 | struct listener { |
| 129 | const char *devname; |
Al Viro | 2850bc2 | 2006-10-07 14:16:45 +0100 | [diff] [blame] | 130 | void (*handler)(struct iop_msg *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | }; |
| 132 | |
| 133 | /* |
| 134 | * IOP structures for the two IOPs |
| 135 | * |
| 136 | * The SCC IOP controls both serial ports (A and B) as its two functions. |
| 137 | * The ISM IOP controls the SWIM (floppy drive) and ADB. |
| 138 | */ |
| 139 | |
| 140 | static volatile struct mac_iop *iop_base[NUM_IOPS]; |
| 141 | |
| 142 | /* |
| 143 | * IOP message queues |
| 144 | */ |
| 145 | |
| 146 | static struct iop_msg iop_msg_pool[NUM_IOP_MSGS]; |
| 147 | static struct iop_msg *iop_send_queue[NUM_IOPS][NUM_IOP_CHAN]; |
| 148 | static struct listener iop_listeners[NUM_IOPS][NUM_IOP_CHAN]; |
| 149 | |
Al Viro | 2850bc2 | 2006-10-07 14:16:45 +0100 | [diff] [blame] | 150 | irqreturn_t iop_ism_irq(int, void *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | |
| 152 | extern void oss_irq_enable(int); |
| 153 | |
| 154 | /* |
| 155 | * Private access functions |
| 156 | */ |
| 157 | |
| 158 | static __inline__ void iop_loadaddr(volatile struct mac_iop *iop, __u16 addr) |
| 159 | { |
| 160 | iop->ram_addr_lo = addr; |
| 161 | iop->ram_addr_hi = addr >> 8; |
| 162 | } |
| 163 | |
| 164 | static __inline__ __u8 iop_readb(volatile struct mac_iop *iop, __u16 addr) |
| 165 | { |
| 166 | iop->ram_addr_lo = addr; |
| 167 | iop->ram_addr_hi = addr >> 8; |
| 168 | return iop->ram_data; |
| 169 | } |
| 170 | |
| 171 | static __inline__ void iop_writeb(volatile struct mac_iop *iop, __u16 addr, __u8 data) |
| 172 | { |
| 173 | iop->ram_addr_lo = addr; |
| 174 | iop->ram_addr_hi = addr >> 8; |
| 175 | iop->ram_data = data; |
| 176 | } |
| 177 | |
| 178 | static __inline__ void iop_stop(volatile struct mac_iop *iop) |
| 179 | { |
| 180 | iop->status_ctrl &= ~IOP_RUN; |
| 181 | } |
| 182 | |
| 183 | static __inline__ void iop_start(volatile struct mac_iop *iop) |
| 184 | { |
| 185 | iop->status_ctrl = IOP_RUN | IOP_AUTOINC; |
| 186 | } |
| 187 | |
| 188 | static __inline__ void iop_bypass(volatile struct mac_iop *iop) |
| 189 | { |
| 190 | iop->status_ctrl |= IOP_BYPASS; |
| 191 | } |
| 192 | |
| 193 | static __inline__ void iop_interrupt(volatile struct mac_iop *iop) |
| 194 | { |
| 195 | iop->status_ctrl |= IOP_IRQ; |
| 196 | } |
| 197 | |
| 198 | static int iop_alive(volatile struct mac_iop *iop) |
| 199 | { |
| 200 | int retval; |
| 201 | |
| 202 | retval = (iop_readb(iop, IOP_ADDR_ALIVE) == 0xFF); |
| 203 | iop_writeb(iop, IOP_ADDR_ALIVE, 0); |
| 204 | return retval; |
| 205 | } |
| 206 | |
| 207 | static struct iop_msg *iop_alloc_msg(void) |
| 208 | { |
| 209 | int i; |
| 210 | unsigned long flags; |
| 211 | |
| 212 | local_irq_save(flags); |
| 213 | |
| 214 | for (i = 0 ; i < NUM_IOP_MSGS ; i++) { |
| 215 | if (iop_msg_pool[i].status == IOP_MSGSTATUS_UNUSED) { |
| 216 | iop_msg_pool[i].status = IOP_MSGSTATUS_WAITING; |
| 217 | local_irq_restore(flags); |
| 218 | return &iop_msg_pool[i]; |
| 219 | } |
| 220 | } |
| 221 | |
| 222 | local_irq_restore(flags); |
| 223 | return NULL; |
| 224 | } |
| 225 | |
| 226 | static void iop_free_msg(struct iop_msg *msg) |
| 227 | { |
| 228 | msg->status = IOP_MSGSTATUS_UNUSED; |
| 229 | } |
| 230 | |
| 231 | /* |
| 232 | * This is called by the startup code before anything else. Its purpose |
| 233 | * is to find and initialize the IOPs early in the boot sequence, so that |
| 234 | * the serial IOP can be placed into bypass mode _before_ we try to |
| 235 | * initialize the serial console. |
| 236 | */ |
| 237 | |
| 238 | void __init iop_preinit(void) |
| 239 | { |
| 240 | if (macintosh_config->scc_type == MAC_SCC_IOP) { |
| 241 | if (macintosh_config->ident == MAC_MODEL_IIFX) { |
| 242 | iop_base[IOP_NUM_SCC] = (struct mac_iop *) SCC_IOP_BASE_IIFX; |
| 243 | } else { |
| 244 | iop_base[IOP_NUM_SCC] = (struct mac_iop *) SCC_IOP_BASE_QUADRA; |
| 245 | } |
| 246 | iop_base[IOP_NUM_SCC]->status_ctrl = 0x87; |
| 247 | iop_scc_present = 1; |
| 248 | } else { |
| 249 | iop_base[IOP_NUM_SCC] = NULL; |
| 250 | iop_scc_present = 0; |
| 251 | } |
| 252 | if (macintosh_config->adb_type == MAC_ADB_IOP) { |
| 253 | if (macintosh_config->ident == MAC_MODEL_IIFX) { |
| 254 | iop_base[IOP_NUM_ISM] = (struct mac_iop *) ISM_IOP_BASE_IIFX; |
| 255 | } else { |
| 256 | iop_base[IOP_NUM_ISM] = (struct mac_iop *) ISM_IOP_BASE_QUADRA; |
| 257 | } |
| 258 | iop_base[IOP_NUM_ISM]->status_ctrl = 0; |
| 259 | iop_ism_present = 1; |
| 260 | } else { |
| 261 | iop_base[IOP_NUM_ISM] = NULL; |
| 262 | iop_ism_present = 0; |
| 263 | } |
| 264 | } |
| 265 | |
| 266 | /* |
| 267 | * Initialize the IOPs, if present. |
| 268 | */ |
| 269 | |
| 270 | void __init iop_init(void) |
| 271 | { |
| 272 | int i; |
| 273 | |
| 274 | if (iop_scc_present) { |
| 275 | printk("IOP: detected SCC IOP at %p\n", iop_base[IOP_NUM_SCC]); |
| 276 | } |
| 277 | if (iop_ism_present) { |
| 278 | printk("IOP: detected ISM IOP at %p\n", iop_base[IOP_NUM_ISM]); |
| 279 | iop_start(iop_base[IOP_NUM_ISM]); |
| 280 | iop_alive(iop_base[IOP_NUM_ISM]); /* clears the alive flag */ |
| 281 | } |
| 282 | |
| 283 | /* Make the whole pool available and empty the queues */ |
| 284 | |
| 285 | for (i = 0 ; i < NUM_IOP_MSGS ; i++) { |
| 286 | iop_msg_pool[i].status = IOP_MSGSTATUS_UNUSED; |
| 287 | } |
| 288 | |
| 289 | for (i = 0 ; i < NUM_IOP_CHAN ; i++) { |
Al Viro | a5d361f | 2006-01-12 01:06:34 -0800 | [diff] [blame] | 290 | iop_send_queue[IOP_NUM_SCC][i] = NULL; |
| 291 | iop_send_queue[IOP_NUM_ISM][i] = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | iop_listeners[IOP_NUM_SCC][i].devname = NULL; |
| 293 | iop_listeners[IOP_NUM_SCC][i].handler = NULL; |
| 294 | iop_listeners[IOP_NUM_ISM][i].devname = NULL; |
| 295 | iop_listeners[IOP_NUM_ISM][i].handler = NULL; |
| 296 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | } |
| 298 | |
| 299 | /* |
| 300 | * Register the interrupt handler for the IOPs. |
| 301 | * TODO: might be wrong for non-OSS machines. Anyone? |
| 302 | */ |
| 303 | |
| 304 | void __init iop_register_interrupts(void) |
| 305 | { |
| 306 | if (iop_ism_present) { |
| 307 | if (oss_present) { |
Geert Uytterhoeven | 92c3dd1 | 2008-12-30 14:02:27 +0100 | [diff] [blame] | 308 | if (request_irq(OSS_IRQLEV_IOPISM, iop_ism_irq, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | IRQ_FLG_LOCK, "ISM IOP", |
Geert Uytterhoeven | 92c3dd1 | 2008-12-30 14:02:27 +0100 | [diff] [blame] | 310 | (void *) IOP_NUM_ISM)) |
| 311 | pr_err("Couldn't register ISM IOP interrupt\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | oss_irq_enable(IRQ_MAC_ADB); |
| 313 | } else { |
Geert Uytterhoeven | 92c3dd1 | 2008-12-30 14:02:27 +0100 | [diff] [blame] | 314 | if (request_irq(IRQ_VIA2_0, iop_ism_irq, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | IRQ_FLG_LOCK|IRQ_FLG_FAST, "ISM IOP", |
Geert Uytterhoeven | 92c3dd1 | 2008-12-30 14:02:27 +0100 | [diff] [blame] | 316 | (void *) IOP_NUM_ISM)) |
| 317 | pr_err("Couldn't register ISM IOP interrupt\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | } |
| 319 | if (!iop_alive(iop_base[IOP_NUM_ISM])) { |
| 320 | printk("IOP: oh my god, they killed the ISM IOP!\n"); |
| 321 | } else { |
| 322 | printk("IOP: the ISM IOP seems to be alive.\n"); |
| 323 | } |
| 324 | } |
| 325 | } |
| 326 | |
| 327 | /* |
| 328 | * Register or unregister a listener for a specific IOP and channel |
| 329 | * |
| 330 | * If the handler pointer is NULL the current listener (if any) is |
| 331 | * unregistered. Otherwise the new listener is registered provided |
| 332 | * there is no existing listener registered. |
| 333 | */ |
| 334 | |
| 335 | int iop_listen(uint iop_num, uint chan, |
Al Viro | 2850bc2 | 2006-10-07 14:16:45 +0100 | [diff] [blame] | 336 | void (*handler)(struct iop_msg *), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | const char *devname) |
| 338 | { |
| 339 | if ((iop_num >= NUM_IOPS) || !iop_base[iop_num]) return -EINVAL; |
| 340 | if (chan >= NUM_IOP_CHAN) return -EINVAL; |
| 341 | if (iop_listeners[iop_num][chan].handler && handler) return -EINVAL; |
| 342 | iop_listeners[iop_num][chan].devname = devname; |
| 343 | iop_listeners[iop_num][chan].handler = handler; |
| 344 | return 0; |
| 345 | } |
| 346 | |
| 347 | /* |
| 348 | * Complete reception of a message, which just means copying the reply |
| 349 | * into the buffer, setting the channel state to MSG_COMPLETE and |
| 350 | * notifying the IOP. |
| 351 | */ |
| 352 | |
| 353 | void iop_complete_message(struct iop_msg *msg) |
| 354 | { |
| 355 | int iop_num = msg->iop_num; |
| 356 | int chan = msg->channel; |
| 357 | int i,offset; |
| 358 | |
| 359 | #ifdef DEBUG_IOP |
| 360 | printk("iop_complete(%p): iop %d chan %d\n", msg, msg->iop_num, msg->channel); |
| 361 | #endif |
| 362 | |
| 363 | offset = IOP_ADDR_RECV_MSG + (msg->channel * IOP_MSG_LEN); |
| 364 | |
| 365 | for (i = 0 ; i < IOP_MSG_LEN ; i++, offset++) { |
| 366 | iop_writeb(iop_base[iop_num], offset, msg->reply[i]); |
| 367 | } |
| 368 | |
| 369 | iop_writeb(iop_base[iop_num], |
| 370 | IOP_ADDR_RECV_STATE + chan, IOP_MSG_COMPLETE); |
| 371 | iop_interrupt(iop_base[msg->iop_num]); |
| 372 | |
| 373 | iop_free_msg(msg); |
| 374 | } |
| 375 | |
| 376 | /* |
| 377 | * Actually put a message into a send channel buffer |
| 378 | */ |
| 379 | |
| 380 | static void iop_do_send(struct iop_msg *msg) |
| 381 | { |
| 382 | volatile struct mac_iop *iop = iop_base[msg->iop_num]; |
| 383 | int i,offset; |
| 384 | |
| 385 | offset = IOP_ADDR_SEND_MSG + (msg->channel * IOP_MSG_LEN); |
| 386 | |
| 387 | for (i = 0 ; i < IOP_MSG_LEN ; i++, offset++) { |
| 388 | iop_writeb(iop, offset, msg->message[i]); |
| 389 | } |
| 390 | |
| 391 | iop_writeb(iop, IOP_ADDR_SEND_STATE + msg->channel, IOP_MSG_NEW); |
| 392 | |
| 393 | iop_interrupt(iop); |
| 394 | } |
| 395 | |
| 396 | /* |
| 397 | * Handle sending a message on a channel that |
| 398 | * has gone into the IOP_MSG_COMPLETE state. |
| 399 | */ |
| 400 | |
Al Viro | 2850bc2 | 2006-10-07 14:16:45 +0100 | [diff] [blame] | 401 | static void iop_handle_send(uint iop_num, uint chan) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | { |
| 403 | volatile struct mac_iop *iop = iop_base[iop_num]; |
| 404 | struct iop_msg *msg,*msg2; |
| 405 | int i,offset; |
| 406 | |
| 407 | #ifdef DEBUG_IOP |
| 408 | printk("iop_handle_send: iop %d channel %d\n", iop_num, chan); |
| 409 | #endif |
| 410 | |
| 411 | iop_writeb(iop, IOP_ADDR_SEND_STATE + chan, IOP_MSG_IDLE); |
| 412 | |
| 413 | if (!(msg = iop_send_queue[iop_num][chan])) return; |
| 414 | |
| 415 | msg->status = IOP_MSGSTATUS_COMPLETE; |
| 416 | offset = IOP_ADDR_SEND_MSG + (chan * IOP_MSG_LEN); |
| 417 | for (i = 0 ; i < IOP_MSG_LEN ; i++, offset++) { |
| 418 | msg->reply[i] = iop_readb(iop, offset); |
| 419 | } |
Al Viro | 2850bc2 | 2006-10-07 14:16:45 +0100 | [diff] [blame] | 420 | if (msg->handler) (*msg->handler)(msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | msg2 = msg; |
| 422 | msg = msg->next; |
| 423 | iop_free_msg(msg2); |
| 424 | |
| 425 | iop_send_queue[iop_num][chan] = msg; |
| 426 | if (msg) iop_do_send(msg); |
| 427 | } |
| 428 | |
| 429 | /* |
| 430 | * Handle reception of a message on a channel that has |
| 431 | * gone into the IOP_MSG_NEW state. |
| 432 | */ |
| 433 | |
Al Viro | 2850bc2 | 2006-10-07 14:16:45 +0100 | [diff] [blame] | 434 | static void iop_handle_recv(uint iop_num, uint chan) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | { |
| 436 | volatile struct mac_iop *iop = iop_base[iop_num]; |
| 437 | int i,offset; |
| 438 | struct iop_msg *msg; |
| 439 | |
| 440 | #ifdef DEBUG_IOP |
| 441 | printk("iop_handle_recv: iop %d channel %d\n", iop_num, chan); |
| 442 | #endif |
| 443 | |
| 444 | msg = iop_alloc_msg(); |
| 445 | msg->iop_num = iop_num; |
| 446 | msg->channel = chan; |
| 447 | msg->status = IOP_MSGSTATUS_UNSOL; |
| 448 | msg->handler = iop_listeners[iop_num][chan].handler; |
| 449 | |
| 450 | offset = IOP_ADDR_RECV_MSG + (chan * IOP_MSG_LEN); |
| 451 | |
| 452 | for (i = 0 ; i < IOP_MSG_LEN ; i++, offset++) { |
| 453 | msg->message[i] = iop_readb(iop, offset); |
| 454 | } |
| 455 | |
| 456 | iop_writeb(iop, IOP_ADDR_RECV_STATE + chan, IOP_MSG_RCVD); |
| 457 | |
| 458 | /* If there is a listener, call it now. Otherwise complete */ |
| 459 | /* the message ourselves to avoid possible stalls. */ |
| 460 | |
| 461 | if (msg->handler) { |
Al Viro | 2850bc2 | 2006-10-07 14:16:45 +0100 | [diff] [blame] | 462 | (*msg->handler)(msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | } else { |
| 464 | #ifdef DEBUG_IOP |
| 465 | printk("iop_handle_recv: unclaimed message on iop %d channel %d\n", iop_num, chan); |
| 466 | printk("iop_handle_recv:"); |
| 467 | for (i = 0 ; i < IOP_MSG_LEN ; i++) { |
| 468 | printk(" %02X", (uint) msg->message[i]); |
| 469 | } |
| 470 | printk("\n"); |
| 471 | #endif |
| 472 | iop_complete_message(msg); |
| 473 | } |
| 474 | } |
| 475 | |
| 476 | /* |
| 477 | * Send a message |
| 478 | * |
| 479 | * The message is placed at the end of the send queue. Afterwards if the |
| 480 | * channel is idle we force an immediate send of the next message in the |
| 481 | * queue. |
| 482 | */ |
| 483 | |
| 484 | int iop_send_message(uint iop_num, uint chan, void *privdata, |
| 485 | uint msg_len, __u8 *msg_data, |
Al Viro | 2850bc2 | 2006-10-07 14:16:45 +0100 | [diff] [blame] | 486 | void (*handler)(struct iop_msg *)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 487 | { |
| 488 | struct iop_msg *msg, *q; |
| 489 | |
| 490 | if ((iop_num >= NUM_IOPS) || !iop_base[iop_num]) return -EINVAL; |
| 491 | if (chan >= NUM_IOP_CHAN) return -EINVAL; |
| 492 | if (msg_len > IOP_MSG_LEN) return -EINVAL; |
| 493 | |
| 494 | msg = iop_alloc_msg(); |
| 495 | if (!msg) return -ENOMEM; |
| 496 | |
| 497 | msg->next = NULL; |
| 498 | msg->status = IOP_MSGSTATUS_WAITING; |
| 499 | msg->iop_num = iop_num; |
| 500 | msg->channel = chan; |
| 501 | msg->caller_priv = privdata; |
| 502 | memcpy(msg->message, msg_data, msg_len); |
| 503 | msg->handler = handler; |
| 504 | |
| 505 | if (!(q = iop_send_queue[iop_num][chan])) { |
| 506 | iop_send_queue[iop_num][chan] = msg; |
| 507 | } else { |
| 508 | while (q->next) q = q->next; |
| 509 | q->next = msg; |
| 510 | } |
| 511 | |
| 512 | if (iop_readb(iop_base[iop_num], |
| 513 | IOP_ADDR_SEND_STATE + chan) == IOP_MSG_IDLE) { |
| 514 | iop_do_send(msg); |
| 515 | } |
| 516 | |
| 517 | return 0; |
| 518 | } |
| 519 | |
| 520 | /* |
| 521 | * Upload code to the shared RAM of an IOP. |
| 522 | */ |
| 523 | |
| 524 | void iop_upload_code(uint iop_num, __u8 *code_start, |
| 525 | uint code_len, __u16 shared_ram_start) |
| 526 | { |
| 527 | if ((iop_num >= NUM_IOPS) || !iop_base[iop_num]) return; |
| 528 | |
| 529 | iop_loadaddr(iop_base[iop_num], shared_ram_start); |
| 530 | |
| 531 | while (code_len--) { |
| 532 | iop_base[iop_num]->ram_data = *code_start++; |
| 533 | } |
| 534 | } |
| 535 | |
| 536 | /* |
| 537 | * Download code from the shared RAM of an IOP. |
| 538 | */ |
| 539 | |
| 540 | void iop_download_code(uint iop_num, __u8 *code_start, |
| 541 | uint code_len, __u16 shared_ram_start) |
| 542 | { |
| 543 | if ((iop_num >= NUM_IOPS) || !iop_base[iop_num]) return; |
| 544 | |
| 545 | iop_loadaddr(iop_base[iop_num], shared_ram_start); |
| 546 | |
| 547 | while (code_len--) { |
| 548 | *code_start++ = iop_base[iop_num]->ram_data; |
| 549 | } |
| 550 | } |
| 551 | |
| 552 | /* |
| 553 | * Compare the code in the shared RAM of an IOP with a copy in system memory |
| 554 | * and return 0 on match or the first nonmatching system memory address on |
| 555 | * failure. |
| 556 | */ |
| 557 | |
| 558 | __u8 *iop_compare_code(uint iop_num, __u8 *code_start, |
| 559 | uint code_len, __u16 shared_ram_start) |
| 560 | { |
| 561 | if ((iop_num >= NUM_IOPS) || !iop_base[iop_num]) return code_start; |
| 562 | |
| 563 | iop_loadaddr(iop_base[iop_num], shared_ram_start); |
| 564 | |
| 565 | while (code_len--) { |
| 566 | if (*code_start != iop_base[iop_num]->ram_data) { |
| 567 | return code_start; |
| 568 | } |
| 569 | code_start++; |
| 570 | } |
| 571 | return (__u8 *) 0; |
| 572 | } |
| 573 | |
| 574 | /* |
| 575 | * Handle an ISM IOP interrupt |
| 576 | */ |
| 577 | |
Al Viro | 2850bc2 | 2006-10-07 14:16:45 +0100 | [diff] [blame] | 578 | irqreturn_t iop_ism_irq(int irq, void *dev_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | { |
| 580 | uint iop_num = (uint) dev_id; |
| 581 | volatile struct mac_iop *iop = iop_base[iop_num]; |
| 582 | int i,state; |
| 583 | |
| 584 | #ifdef DEBUG_IOP |
| 585 | printk("iop_ism_irq: status = %02X\n", (uint) iop->status_ctrl); |
| 586 | #endif |
| 587 | |
| 588 | /* INT0 indicates a state change on an outgoing message channel */ |
| 589 | |
| 590 | if (iop->status_ctrl & IOP_INT0) { |
| 591 | iop->status_ctrl = IOP_INT0 | IOP_RUN | IOP_AUTOINC; |
| 592 | #ifdef DEBUG_IOP |
| 593 | printk("iop_ism_irq: new status = %02X, send states", |
| 594 | (uint) iop->status_ctrl); |
| 595 | #endif |
| 596 | for (i = 0 ; i < NUM_IOP_CHAN ; i++) { |
| 597 | state = iop_readb(iop, IOP_ADDR_SEND_STATE + i); |
| 598 | #ifdef DEBUG_IOP |
| 599 | printk(" %02X", state); |
| 600 | #endif |
| 601 | if (state == IOP_MSG_COMPLETE) { |
Al Viro | 2850bc2 | 2006-10-07 14:16:45 +0100 | [diff] [blame] | 602 | iop_handle_send(iop_num, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | } |
| 604 | } |
| 605 | #ifdef DEBUG_IOP |
| 606 | printk("\n"); |
| 607 | #endif |
| 608 | } |
| 609 | |
| 610 | if (iop->status_ctrl & IOP_INT1) { /* INT1 for incoming msgs */ |
| 611 | iop->status_ctrl = IOP_INT1 | IOP_RUN | IOP_AUTOINC; |
| 612 | #ifdef DEBUG_IOP |
| 613 | printk("iop_ism_irq: new status = %02X, recv states", |
| 614 | (uint) iop->status_ctrl); |
| 615 | #endif |
| 616 | for (i = 0 ; i < NUM_IOP_CHAN ; i++) { |
| 617 | state = iop_readb(iop, IOP_ADDR_RECV_STATE + i); |
| 618 | #ifdef DEBUG_IOP |
| 619 | printk(" %02X", state); |
| 620 | #endif |
| 621 | if (state == IOP_MSG_NEW) { |
Al Viro | 2850bc2 | 2006-10-07 14:16:45 +0100 | [diff] [blame] | 622 | iop_handle_recv(iop_num, i); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | } |
| 624 | } |
| 625 | #ifdef DEBUG_IOP |
| 626 | printk("\n"); |
| 627 | #endif |
| 628 | } |
| 629 | return IRQ_HANDLED; |
| 630 | } |