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Diffstat (limited to 'ANDROID_3.4.5/arch/m68k/mac/iop.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/m68k/mac/iop.c | 624 |
1 files changed, 0 insertions, 624 deletions
diff --git a/ANDROID_3.4.5/arch/m68k/mac/iop.c b/ANDROID_3.4.5/arch/m68k/mac/iop.c deleted file mode 100644 index 7d8d4612..00000000 --- a/ANDROID_3.4.5/arch/m68k/mac/iop.c +++ /dev/null @@ -1,624 +0,0 @@ -/* - * I/O Processor (IOP) management - * Written and (C) 1999 by Joshua M. Thompson (funaho@jurai.org) - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice and this list of conditions. - * 2. Redistributions in binary form must reproduce the above copyright - * notice and this list of conditions in the documentation and/or other - * materials provided with the distribution. - */ - -/* - * The IOP chips are used in the IIfx and some Quadras (900, 950) to manage - * serial and ADB. They are actually a 6502 processor and some glue logic. - * - * 990429 (jmt) - Initial implementation, just enough to knock the SCC IOP - * into compatible mode so nobody has to fiddle with the - * Serial Switch control panel anymore. - * 990603 (jmt) - Added code to grab the correct ISM IOP interrupt for OSS - * and non-OSS machines (at least I hope it's correct on a - * non-OSS machine -- someone with a Q900 or Q950 needs to - * check this.) - * 990605 (jmt) - Rearranged things a bit wrt IOP detection; iop_present is - * gone, IOP base addresses are now in an array and the - * globally-visible functions take an IOP number instead of an - * an actual base address. - * 990610 (jmt) - Finished the message passing framework and it seems to work. - * Sending _definitely_ works; my adb-bus.c mods can send - * messages and receive the MSG_COMPLETED status back from the - * IOP. The trick now is figuring out the message formats. - * 990611 (jmt) - More cleanups. Fixed problem where unclaimed messages on a - * receive channel were never properly acknowledged. Bracketed - * the remaining debug printk's with #ifdef's and disabled - * debugging. I can now type on the console. - * 990612 (jmt) - Copyright notice added. Reworked the way replies are handled. - * It turns out that replies are placed back in the send buffer - * for that channel; messages on the receive channels are always - * unsolicited messages from the IOP (and our replies to them - * should go back in the receive channel.) Also added tracking - * of device names to the listener functions ala the interrupt - * handlers. - * 990729 (jmt) - Added passing of pt_regs structure to IOP handlers. This is - * used by the new unified ADB driver. - * - * TODO: - * - * o Something should be periodically checking iop_alive() to make sure the - * IOP hasn't died. - * o Some of the IOP manager routines need better error checking and - * return codes. Nothing major, just prettying up. - */ - -/* - * ----------------------- - * IOP Message Passing 101 - * ----------------------- - * - * The host talks to the IOPs using a rather simple message-passing scheme via - * a shared memory area in the IOP RAM. Each IOP has seven "channels"; each - * channel is conneced to a specific software driver on the IOP. For example - * on the SCC IOP there is one channel for each serial port. Each channel has - * an incoming and and outgoing message queue with a depth of one. - * - * A message is 32 bytes plus a state byte for the channel (MSG_IDLE, MSG_NEW, - * MSG_RCVD, MSG_COMPLETE). To send a message you copy the message into the - * buffer, set the state to MSG_NEW and signal the IOP by setting the IRQ flag - * in the IOP control to 1. The IOP will move the state to MSG_RCVD when it - * receives the message and then to MSG_COMPLETE when the message processing - * has completed. It is the host's responsibility at that point to read the - * reply back out of the send channel buffer and reset the channel state back - * to MSG_IDLE. - * - * To receive message from the IOP the same procedure is used except the roles - * are reversed. That is, the IOP puts message in the channel with a state of - * MSG_NEW, and the host receives the message and move its state to MSG_RCVD - * and then to MSG_COMPLETE when processing is completed and the reply (if any) - * has been placed back in the receive channel. The IOP will then reset the - * channel state to MSG_IDLE. - * - * Two sets of host interrupts are provided, INT0 and INT1. Both appear on one - * interrupt level; they are distinguished by a pair of bits in the IOP status - * register. The IOP will raise INT0 when one or more messages in the send - * channels have gone to the MSG_COMPLETE state and it will raise INT1 when one - * or more messages on the receive channels have gone to the MSG_NEW state. - * - * Since each channel handles only one message we have to implement a small - * interrupt-driven queue on our end. Messages to be sent are placed on the - * queue for sending and contain a pointer to an optional callback function. - * The handler for a message is called when the message state goes to - * MSG_COMPLETE. - * - * For receiving message we maintain a list of handler functions to call when - * a message is received on that IOP/channel combination. The handlers are - * called much like an interrupt handler and are passed a copy of the message - * from the IOP. The message state will be in MSG_RCVD while the handler runs; - * it is the handler's responsibility to call iop_complete_message() when - * finished; this function moves the message state to MSG_COMPLETE and signals - * the IOP. This two-step process is provided to allow the handler to defer - * message processing to a bottom-half handler if the processing will take - * a significant amount of time (handlers are called at interrupt time so they - * should execute quickly.) - */ - -#include <linux/types.h> -#include <linux/kernel.h> -#include <linux/mm.h> -#include <linux/delay.h> -#include <linux/init.h> -#include <linux/interrupt.h> - -#include <asm/bootinfo.h> -#include <asm/macintosh.h> -#include <asm/macints.h> -#include <asm/mac_iop.h> - -/*#define DEBUG_IOP*/ - -/* Set to non-zero if the IOPs are present. Set by iop_init() */ - -int iop_scc_present,iop_ism_present; - -/* structure for tracking channel listeners */ - -struct listener { - const char *devname; - void (*handler)(struct iop_msg *); -}; - -/* - * IOP structures for the two IOPs - * - * The SCC IOP controls both serial ports (A and B) as its two functions. - * The ISM IOP controls the SWIM (floppy drive) and ADB. - */ - -static volatile struct mac_iop *iop_base[NUM_IOPS]; - -/* - * IOP message queues - */ - -static struct iop_msg iop_msg_pool[NUM_IOP_MSGS]; -static struct iop_msg *iop_send_queue[NUM_IOPS][NUM_IOP_CHAN]; -static struct listener iop_listeners[NUM_IOPS][NUM_IOP_CHAN]; - -irqreturn_t iop_ism_irq(int, void *); - -/* - * Private access functions - */ - -static __inline__ void iop_loadaddr(volatile struct mac_iop *iop, __u16 addr) -{ - iop->ram_addr_lo = addr; - iop->ram_addr_hi = addr >> 8; -} - -static __inline__ __u8 iop_readb(volatile struct mac_iop *iop, __u16 addr) -{ - iop->ram_addr_lo = addr; - iop->ram_addr_hi = addr >> 8; - return iop->ram_data; -} - -static __inline__ void iop_writeb(volatile struct mac_iop *iop, __u16 addr, __u8 data) -{ - iop->ram_addr_lo = addr; - iop->ram_addr_hi = addr >> 8; - iop->ram_data = data; -} - -static __inline__ void iop_stop(volatile struct mac_iop *iop) -{ - iop->status_ctrl &= ~IOP_RUN; -} - -static __inline__ void iop_start(volatile struct mac_iop *iop) -{ - iop->status_ctrl = IOP_RUN | IOP_AUTOINC; -} - -static __inline__ void iop_bypass(volatile struct mac_iop *iop) -{ - iop->status_ctrl |= IOP_BYPASS; -} - -static __inline__ void iop_interrupt(volatile struct mac_iop *iop) -{ - iop->status_ctrl |= IOP_IRQ; -} - -static int iop_alive(volatile struct mac_iop *iop) -{ - int retval; - - retval = (iop_readb(iop, IOP_ADDR_ALIVE) == 0xFF); - iop_writeb(iop, IOP_ADDR_ALIVE, 0); - return retval; -} - -static struct iop_msg *iop_alloc_msg(void) -{ - int i; - unsigned long flags; - - local_irq_save(flags); - - for (i = 0 ; i < NUM_IOP_MSGS ; i++) { - if (iop_msg_pool[i].status == IOP_MSGSTATUS_UNUSED) { - iop_msg_pool[i].status = IOP_MSGSTATUS_WAITING; - local_irq_restore(flags); - return &iop_msg_pool[i]; - } - } - - local_irq_restore(flags); - return NULL; -} - -static void iop_free_msg(struct iop_msg *msg) -{ - msg->status = IOP_MSGSTATUS_UNUSED; -} - -/* - * This is called by the startup code before anything else. Its purpose - * is to find and initialize the IOPs early in the boot sequence, so that - * the serial IOP can be placed into bypass mode _before_ we try to - * initialize the serial console. - */ - -void __init iop_preinit(void) -{ - if (macintosh_config->scc_type == MAC_SCC_IOP) { - if (macintosh_config->ident == MAC_MODEL_IIFX) { - iop_base[IOP_NUM_SCC] = (struct mac_iop *) SCC_IOP_BASE_IIFX; - } else { - iop_base[IOP_NUM_SCC] = (struct mac_iop *) SCC_IOP_BASE_QUADRA; - } - iop_base[IOP_NUM_SCC]->status_ctrl = 0x87; - iop_scc_present = 1; - } else { - iop_base[IOP_NUM_SCC] = NULL; - iop_scc_present = 0; - } - if (macintosh_config->adb_type == MAC_ADB_IOP) { - if (macintosh_config->ident == MAC_MODEL_IIFX) { - iop_base[IOP_NUM_ISM] = (struct mac_iop *) ISM_IOP_BASE_IIFX; - } else { - iop_base[IOP_NUM_ISM] = (struct mac_iop *) ISM_IOP_BASE_QUADRA; - } - iop_base[IOP_NUM_ISM]->status_ctrl = 0; - iop_ism_present = 1; - } else { - iop_base[IOP_NUM_ISM] = NULL; - iop_ism_present = 0; - } -} - -/* - * Initialize the IOPs, if present. - */ - -void __init iop_init(void) -{ - int i; - - if (iop_scc_present) { - printk("IOP: detected SCC IOP at %p\n", iop_base[IOP_NUM_SCC]); - } - if (iop_ism_present) { - printk("IOP: detected ISM IOP at %p\n", iop_base[IOP_NUM_ISM]); - iop_start(iop_base[IOP_NUM_ISM]); - iop_alive(iop_base[IOP_NUM_ISM]); /* clears the alive flag */ - } - - /* Make the whole pool available and empty the queues */ - - for (i = 0 ; i < NUM_IOP_MSGS ; i++) { - iop_msg_pool[i].status = IOP_MSGSTATUS_UNUSED; - } - - for (i = 0 ; i < NUM_IOP_CHAN ; i++) { - iop_send_queue[IOP_NUM_SCC][i] = NULL; - iop_send_queue[IOP_NUM_ISM][i] = NULL; - iop_listeners[IOP_NUM_SCC][i].devname = NULL; - iop_listeners[IOP_NUM_SCC][i].handler = NULL; - iop_listeners[IOP_NUM_ISM][i].devname = NULL; - iop_listeners[IOP_NUM_ISM][i].handler = NULL; - } -} - -/* - * Register the interrupt handler for the IOPs. - * TODO: might be wrong for non-OSS machines. Anyone? - */ - -void __init iop_register_interrupts(void) -{ - if (iop_ism_present) { - if (macintosh_config->ident == MAC_MODEL_IIFX) { - if (request_irq(IRQ_MAC_ADB, iop_ism_irq, 0, - "ISM IOP", (void *)IOP_NUM_ISM)) - pr_err("Couldn't register ISM IOP interrupt\n"); - } else { - if (request_irq(IRQ_VIA2_0, iop_ism_irq, 0, "ISM IOP", - (void *)IOP_NUM_ISM)) - pr_err("Couldn't register ISM IOP interrupt\n"); - } - if (!iop_alive(iop_base[IOP_NUM_ISM])) { - printk("IOP: oh my god, they killed the ISM IOP!\n"); - } else { - printk("IOP: the ISM IOP seems to be alive.\n"); - } - } -} - -/* - * Register or unregister a listener for a specific IOP and channel - * - * If the handler pointer is NULL the current listener (if any) is - * unregistered. Otherwise the new listener is registered provided - * there is no existing listener registered. - */ - -int iop_listen(uint iop_num, uint chan, - void (*handler)(struct iop_msg *), - const char *devname) -{ - if ((iop_num >= NUM_IOPS) || !iop_base[iop_num]) return -EINVAL; - if (chan >= NUM_IOP_CHAN) return -EINVAL; - if (iop_listeners[iop_num][chan].handler && handler) return -EINVAL; - iop_listeners[iop_num][chan].devname = devname; - iop_listeners[iop_num][chan].handler = handler; - return 0; -} - -/* - * Complete reception of a message, which just means copying the reply - * into the buffer, setting the channel state to MSG_COMPLETE and - * notifying the IOP. - */ - -void iop_complete_message(struct iop_msg *msg) -{ - int iop_num = msg->iop_num; - int chan = msg->channel; - int i,offset; - -#ifdef DEBUG_IOP - printk("iop_complete(%p): iop %d chan %d\n", msg, msg->iop_num, msg->channel); -#endif - - offset = IOP_ADDR_RECV_MSG + (msg->channel * IOP_MSG_LEN); - - for (i = 0 ; i < IOP_MSG_LEN ; i++, offset++) { - iop_writeb(iop_base[iop_num], offset, msg->reply[i]); - } - - iop_writeb(iop_base[iop_num], - IOP_ADDR_RECV_STATE + chan, IOP_MSG_COMPLETE); - iop_interrupt(iop_base[msg->iop_num]); - - iop_free_msg(msg); -} - -/* - * Actually put a message into a send channel buffer - */ - -static void iop_do_send(struct iop_msg *msg) -{ - volatile struct mac_iop *iop = iop_base[msg->iop_num]; - int i,offset; - - offset = IOP_ADDR_SEND_MSG + (msg->channel * IOP_MSG_LEN); - - for (i = 0 ; i < IOP_MSG_LEN ; i++, offset++) { - iop_writeb(iop, offset, msg->message[i]); - } - - iop_writeb(iop, IOP_ADDR_SEND_STATE + msg->channel, IOP_MSG_NEW); - - iop_interrupt(iop); -} - -/* - * Handle sending a message on a channel that - * has gone into the IOP_MSG_COMPLETE state. - */ - -static void iop_handle_send(uint iop_num, uint chan) -{ - volatile struct mac_iop *iop = iop_base[iop_num]; - struct iop_msg *msg,*msg2; - int i,offset; - -#ifdef DEBUG_IOP - printk("iop_handle_send: iop %d channel %d\n", iop_num, chan); -#endif - - iop_writeb(iop, IOP_ADDR_SEND_STATE + chan, IOP_MSG_IDLE); - - if (!(msg = iop_send_queue[iop_num][chan])) return; - - msg->status = IOP_MSGSTATUS_COMPLETE; - offset = IOP_ADDR_SEND_MSG + (chan * IOP_MSG_LEN); - for (i = 0 ; i < IOP_MSG_LEN ; i++, offset++) { - msg->reply[i] = iop_readb(iop, offset); - } - if (msg->handler) (*msg->handler)(msg); - msg2 = msg; - msg = msg->next; - iop_free_msg(msg2); - - iop_send_queue[iop_num][chan] = msg; - if (msg) iop_do_send(msg); -} - -/* - * Handle reception of a message on a channel that has - * gone into the IOP_MSG_NEW state. - */ - -static void iop_handle_recv(uint iop_num, uint chan) -{ - volatile struct mac_iop *iop = iop_base[iop_num]; - int i,offset; - struct iop_msg *msg; - -#ifdef DEBUG_IOP - printk("iop_handle_recv: iop %d channel %d\n", iop_num, chan); -#endif - - msg = iop_alloc_msg(); - msg->iop_num = iop_num; - msg->channel = chan; - msg->status = IOP_MSGSTATUS_UNSOL; - msg->handler = iop_listeners[iop_num][chan].handler; - - offset = IOP_ADDR_RECV_MSG + (chan * IOP_MSG_LEN); - - for (i = 0 ; i < IOP_MSG_LEN ; i++, offset++) { - msg->message[i] = iop_readb(iop, offset); - } - - iop_writeb(iop, IOP_ADDR_RECV_STATE + chan, IOP_MSG_RCVD); - - /* If there is a listener, call it now. Otherwise complete */ - /* the message ourselves to avoid possible stalls. */ - - if (msg->handler) { - (*msg->handler)(msg); - } else { -#ifdef DEBUG_IOP - printk("iop_handle_recv: unclaimed message on iop %d channel %d\n", iop_num, chan); - printk("iop_handle_recv:"); - for (i = 0 ; i < IOP_MSG_LEN ; i++) { - printk(" %02X", (uint) msg->message[i]); - } - printk("\n"); -#endif - iop_complete_message(msg); - } -} - -/* - * Send a message - * - * The message is placed at the end of the send queue. Afterwards if the - * channel is idle we force an immediate send of the next message in the - * queue. - */ - -int iop_send_message(uint iop_num, uint chan, void *privdata, - uint msg_len, __u8 *msg_data, - void (*handler)(struct iop_msg *)) -{ - struct iop_msg *msg, *q; - - if ((iop_num >= NUM_IOPS) || !iop_base[iop_num]) return -EINVAL; - if (chan >= NUM_IOP_CHAN) return -EINVAL; - if (msg_len > IOP_MSG_LEN) return -EINVAL; - - msg = iop_alloc_msg(); - if (!msg) return -ENOMEM; - - msg->next = NULL; - msg->status = IOP_MSGSTATUS_WAITING; - msg->iop_num = iop_num; - msg->channel = chan; - msg->caller_priv = privdata; - memcpy(msg->message, msg_data, msg_len); - msg->handler = handler; - - if (!(q = iop_send_queue[iop_num][chan])) { - iop_send_queue[iop_num][chan] = msg; - } else { - while (q->next) q = q->next; - q->next = msg; - } - - if (iop_readb(iop_base[iop_num], - IOP_ADDR_SEND_STATE + chan) == IOP_MSG_IDLE) { - iop_do_send(msg); - } - - return 0; -} - -/* - * Upload code to the shared RAM of an IOP. - */ - -void iop_upload_code(uint iop_num, __u8 *code_start, - uint code_len, __u16 shared_ram_start) -{ - if ((iop_num >= NUM_IOPS) || !iop_base[iop_num]) return; - - iop_loadaddr(iop_base[iop_num], shared_ram_start); - - while (code_len--) { - iop_base[iop_num]->ram_data = *code_start++; - } -} - -/* - * Download code from the shared RAM of an IOP. - */ - -void iop_download_code(uint iop_num, __u8 *code_start, - uint code_len, __u16 shared_ram_start) -{ - if ((iop_num >= NUM_IOPS) || !iop_base[iop_num]) return; - - iop_loadaddr(iop_base[iop_num], shared_ram_start); - - while (code_len--) { - *code_start++ = iop_base[iop_num]->ram_data; - } -} - -/* - * Compare the code in the shared RAM of an IOP with a copy in system memory - * and return 0 on match or the first nonmatching system memory address on - * failure. - */ - -__u8 *iop_compare_code(uint iop_num, __u8 *code_start, - uint code_len, __u16 shared_ram_start) -{ - if ((iop_num >= NUM_IOPS) || !iop_base[iop_num]) return code_start; - - iop_loadaddr(iop_base[iop_num], shared_ram_start); - - while (code_len--) { - if (*code_start != iop_base[iop_num]->ram_data) { - return code_start; - } - code_start++; - } - return (__u8 *) 0; -} - -/* - * Handle an ISM IOP interrupt - */ - -irqreturn_t iop_ism_irq(int irq, void *dev_id) -{ - uint iop_num = (uint) dev_id; - volatile struct mac_iop *iop = iop_base[iop_num]; - int i,state; - -#ifdef DEBUG_IOP - printk("iop_ism_irq: status = %02X\n", (uint) iop->status_ctrl); -#endif - - /* INT0 indicates a state change on an outgoing message channel */ - - if (iop->status_ctrl & IOP_INT0) { - iop->status_ctrl = IOP_INT0 | IOP_RUN | IOP_AUTOINC; -#ifdef DEBUG_IOP - printk("iop_ism_irq: new status = %02X, send states", - (uint) iop->status_ctrl); -#endif - for (i = 0 ; i < NUM_IOP_CHAN ; i++) { - state = iop_readb(iop, IOP_ADDR_SEND_STATE + i); -#ifdef DEBUG_IOP - printk(" %02X", state); -#endif - if (state == IOP_MSG_COMPLETE) { - iop_handle_send(iop_num, i); - } - } -#ifdef DEBUG_IOP - printk("\n"); -#endif - } - - if (iop->status_ctrl & IOP_INT1) { /* INT1 for incoming msgs */ - iop->status_ctrl = IOP_INT1 | IOP_RUN | IOP_AUTOINC; -#ifdef DEBUG_IOP - printk("iop_ism_irq: new status = %02X, recv states", - (uint) iop->status_ctrl); -#endif - for (i = 0 ; i < NUM_IOP_CHAN ; i++) { - state = iop_readb(iop, IOP_ADDR_RECV_STATE + i); -#ifdef DEBUG_IOP - printk(" %02X", state); -#endif - if (state == IOP_MSG_NEW) { - iop_handle_recv(iop_num, i); - } - } -#ifdef DEBUG_IOP - printk("\n"); -#endif - } - return IRQ_HANDLED; -} |