| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Linus Torvalds (pre-git) | 6152 | 50.02% | 60 | 48.00% |
| Russell King | 5738 | 46.65% | 17 | 13.60% |
| Hannes Reinecke | 97 | 0.79% | 8 | 6.40% |
| Bart Van Assche | 90 | 0.73% | 6 | 4.80% |
| Henrik Kretzschmar | 44 | 0.36% | 1 | 0.80% |
| Christoph Hellwig | 38 | 0.31% | 9 | 7.20% |
| Al Viro | 28 | 0.23% | 1 | 0.80% |
| Boaz Harrosh | 27 | 0.22% | 1 | 0.80% |
| Kees Cook | 18 | 0.15% | 2 | 1.60% |
| Jeff Garzik | 15 | 0.12% | 2 | 1.60% |
| Gustavo A. R. Silva | 13 | 0.11% | 2 | 1.60% |
| Linus Torvalds | 10 | 0.08% | 2 | 1.60% |
| Arnd Bergmann | 6 | 0.05% | 2 | 1.60% |
| Randy Dunlap | 4 | 0.03% | 1 | 0.80% |
| Matthew Dharm | 4 | 0.03% | 1 | 0.80% |
| Rasmus Villemoes | 3 | 0.02% | 1 | 0.80% |
| Guennadi Liakhovetski | 2 | 0.02% | 1 | 0.80% |
| Lucas De Marchi | 2 | 0.02% | 1 | 0.80% |
| Thomas Gleixner | 2 | 0.02% | 1 | 0.80% |
| Wei Ming Chen | 2 | 0.02% | 1 | 0.80% |
| Mike Anderson | 2 | 0.02% | 2 | 1.60% |
| Arjan van de Ven | 1 | 0.01% | 1 | 0.80% |
| Harvey Harrison | 1 | 0.01% | 1 | 0.80% |
| Adrian Bunk | 1 | 0.01% | 1 | 0.80% |
| Total | 12300 | 125 |
// SPDX-License-Identifier: GPL-2.0-only /* * linux/drivers/acorn/scsi/fas216.c * * Copyright (C) 1997-2003 Russell King * * Based on information in qlogicfas.c by Tom Zerucha, Michael Griffith, and * other sources, including: * the AMD Am53CF94 data sheet * the AMD Am53C94 data sheet * * This is a generic driver. To use it, have a look at cumana_2.c. You * should define your own structure that overlays FAS216_Info, eg: * struct my_host_data { * FAS216_Info info; * ... my host specific data ... * }; * * Changelog: * 30-08-1997 RMK Created * 14-09-1997 RMK Started disconnect support * 08-02-1998 RMK Corrected real DMA support * 15-02-1998 RMK Started sync xfer support * 06-04-1998 RMK Tightened conditions for printing incomplete * transfers * 02-05-1998 RMK Added extra checks in fas216_reset * 24-05-1998 RMK Fixed synchronous transfers with period >= 200ns * 27-06-1998 RMK Changed asm/delay.h to linux/delay.h * 26-08-1998 RMK Improved message support wrt MESSAGE_REJECT * 02-04-2000 RMK Converted to use the new error handling, and * automatically request sense data upon check * condition status from targets. */ #include <linux/module.h> #include <linux/blkdev.h> #include <linux/kernel.h> #include <linux/string.h> #include <linux/ioport.h> #include <linux/proc_fs.h> #include <linux/delay.h> #include <linux/bitops.h> #include <linux/init.h> #include <linux/interrupt.h> #include <asm/dma.h> #include <asm/io.h> #include <asm/irq.h> #include <asm/ecard.h> #include <scsi/scsi.h> #include <scsi/scsi_cmnd.h> #include <scsi/scsi_dbg.h> #include <scsi/scsi_device.h> #include <scsi/scsi_eh.h> #include <scsi/scsi_host.h> #include <scsi/scsi_tcq.h> #include "fas216.h" #include "arm_scsi.h" /* NOTE: SCSI2 Synchronous transfers *require* DMA according to * the data sheet. This restriction is crazy, especially when * you only want to send 16 bytes! What were the guys who * designed this chip on at that time? Did they read the SCSI2 * spec at all? The following sections are taken from the SCSI2 * standard (s2r10) concerning this: * * > IMPLEMENTORS NOTES: * > (1) Re-negotiation at every selection is not recommended, since a * > significant performance impact is likely. * * > The implied synchronous agreement shall remain in effect until a BUS DEVICE * > RESET message is received, until a hard reset condition occurs, or until one * > of the two SCSI devices elects to modify the agreement. The default data * > transfer mode is asynchronous data transfer mode. The default data transfer * > mode is entered at power on, after a BUS DEVICE RESET message, or after a hard * > reset condition. * * In total, this means that once you have elected to use synchronous * transfers, you must always use DMA. * * I was thinking that this was a good chip until I found this restriction ;( */ #define SCSI2_SYNC #undef DEBUG_CONNECT #undef DEBUG_MESSAGES #undef CHECK_STRUCTURE #define LOG_CONNECT (1 << 0) #define LOG_BUSSERVICE (1 << 1) #define LOG_FUNCTIONDONE (1 << 2) #define LOG_MESSAGES (1 << 3) #define LOG_BUFFER (1 << 4) #define LOG_ERROR (1 << 8) static int level_mask = LOG_ERROR; module_param(level_mask, int, 0644); #ifndef MODULE static int __init fas216_log_setup(char *str) { char *s; level_mask = 0; while ((s = strsep(&str, ",")) != NULL) { switch (s[0]) { case 'a': if (strcmp(s, "all") == 0) level_mask |= -1; break; case 'b': if (strncmp(s, "bus", 3) == 0) level_mask |= LOG_BUSSERVICE; if (strncmp(s, "buf", 3) == 0) level_mask |= LOG_BUFFER; break; case 'c': level_mask |= LOG_CONNECT; break; case 'e': level_mask |= LOG_ERROR; break; case 'm': level_mask |= LOG_MESSAGES; break; case 'n': if (strcmp(s, "none") == 0) level_mask = 0; break; case 's': level_mask |= LOG_FUNCTIONDONE; break; } } return 1; } __setup("fas216_logging=", fas216_log_setup); #endif static inline unsigned char fas216_readb(FAS216_Info *info, unsigned int reg) { unsigned int off = reg << info->scsi.io_shift; return readb(info->scsi.io_base + off); } static inline void fas216_writeb(FAS216_Info *info, unsigned int reg, unsigned int val) { unsigned int off = reg << info->scsi.io_shift; writeb(val, info->scsi.io_base + off); } static void fas216_dumpstate(FAS216_Info *info) { unsigned char is, stat, inst; is = fas216_readb(info, REG_IS); stat = fas216_readb(info, REG_STAT); inst = fas216_readb(info, REG_INST); printk("FAS216: CTCL=%02X CTCM=%02X CMD=%02X STAT=%02X" " INST=%02X IS=%02X CFIS=%02X", fas216_readb(info, REG_CTCL), fas216_readb(info, REG_CTCM), fas216_readb(info, REG_CMD), stat, inst, is, fas216_readb(info, REG_CFIS)); printk(" CNTL1=%02X CNTL2=%02X CNTL3=%02X CTCH=%02X\n", fas216_readb(info, REG_CNTL1), fas216_readb(info, REG_CNTL2), fas216_readb(info, REG_CNTL3), fas216_readb(info, REG_CTCH)); } static void print_SCp(struct scsi_pointer *SCp, const char *prefix, const char *suffix) { printk("%sptr %p this_residual 0x%x buffer %p buffers_residual 0x%x%s", prefix, SCp->ptr, SCp->this_residual, SCp->buffer, SCp->buffers_residual, suffix); } #ifdef CHECK_STRUCTURE static void fas216_dumpinfo(FAS216_Info *info) { static int used = 0; int i; if (used++) return; printk("FAS216_Info=\n"); printk(" { magic_start=%lX host=%p SCpnt=%p origSCpnt=%p\n", info->magic_start, info->host, info->SCpnt, info->origSCpnt); printk(" scsi={ io_shift=%X irq=%X cfg={ %X %X %X %X }\n", info->scsi.io_shift, info->scsi.irq, info->scsi.cfg[0], info->scsi.cfg[1], info->scsi.cfg[2], info->scsi.cfg[3]); printk(" type=%p phase=%X\n", info->scsi.type, info->scsi.phase); print_SCp(&info->scsi.SCp, " SCp={ ", " }\n"); printk(" msgs async_stp=%X disconnectable=%d aborting=%d }\n", info->scsi.async_stp, info->scsi.disconnectable, info->scsi.aborting); printk(" stats={ queues=%X removes=%X fins=%X reads=%X writes=%X miscs=%X\n" " disconnects=%X aborts=%X bus_resets=%X host_resets=%X}\n", info->stats.queues, info->stats.removes, info->stats.fins, info->stats.reads, info->stats.writes, info->stats.miscs, info->stats.disconnects, info->stats.aborts, info->stats.bus_resets, info->stats.host_resets); printk(" ifcfg={ clockrate=%X select_timeout=%X asyncperiod=%X sync_max_depth=%X }\n", info->ifcfg.clockrate, info->ifcfg.select_timeout, info->ifcfg.asyncperiod, info->ifcfg.sync_max_depth); for (i = 0; i < 8; i++) { printk(" busyluns[%d]=%08lx dev[%d]={ disconnect_ok=%d stp=%X sof=%X sync_state=%X }\n", i, info->busyluns[i], i, info->device[i].disconnect_ok, info->device[i].stp, info->device[i].sof, info->device[i].sync_state); } printk(" dma={ transfer_type=%X setup=%p pseudo=%p stop=%p }\n", info->dma.transfer_type, info->dma.setup, info->dma.pseudo, info->dma.stop); printk(" internal_done=%X magic_end=%lX }\n", info->internal_done, info->magic_end); } static void __fas216_checkmagic(FAS216_Info *info, const char *func) { int corruption = 0; if (info->magic_start != MAGIC) { printk(KERN_CRIT "FAS216 Error: magic at start corrupted\n"); corruption++; } if (info->magic_end != MAGIC) { printk(KERN_CRIT "FAS216 Error: magic at end corrupted\n"); corruption++; } if (corruption) { fas216_dumpinfo(info); panic("scsi memory space corrupted in %s", func); } } #define fas216_checkmagic(info) __fas216_checkmagic((info), __func__) #else #define fas216_checkmagic(info) #endif static const char *fas216_bus_phase(int stat) { static const char *phases[] = { "DATA OUT", "DATA IN", "COMMAND", "STATUS", "MISC OUT", "MISC IN", "MESG OUT", "MESG IN" }; return phases[stat & STAT_BUSMASK]; } static const char *fas216_drv_phase(FAS216_Info *info) { static const char *phases[] = { [PHASE_IDLE] = "idle", [PHASE_SELECTION] = "selection", [PHASE_COMMAND] = "command", [PHASE_DATAOUT] = "data out", [PHASE_DATAIN] = "data in", [PHASE_MSGIN] = "message in", [PHASE_MSGIN_DISCONNECT]= "disconnect", [PHASE_MSGOUT_EXPECT] = "expect message out", [PHASE_MSGOUT] = "message out", [PHASE_STATUS] = "status", [PHASE_DONE] = "done", }; if (info->scsi.phase < ARRAY_SIZE(phases) && phases[info->scsi.phase]) return phases[info->scsi.phase]; return "???"; } static char fas216_target(FAS216_Info *info) { if (info->SCpnt) return '0' + info->SCpnt->device->id; else return 'H'; } static void fas216_do_log(FAS216_Info *info, char target, char *fmt, va_list ap) { static char buf[1024]; vsnprintf(buf, sizeof(buf), fmt, ap); printk("scsi%d.%c: %s", info->host->host_no, target, buf); } static void fas216_log_command(FAS216_Info *info, int level, struct scsi_cmnd *SCpnt, char *fmt, ...) { va_list args; if (level != 0 && !(level & level_mask)) return; va_start(args, fmt); fas216_do_log(info, '0' + SCpnt->device->id, fmt, args); va_end(args); scsi_print_command(SCpnt); } static void fas216_log_target(FAS216_Info *info, int level, int target, char *fmt, ...) { va_list args; if (level != 0 && !(level & level_mask)) return; if (target < 0) target = 'H'; else target += '0'; va_start(args, fmt); fas216_do_log(info, target, fmt, args); va_end(args); printk("\n"); } static void fas216_log(FAS216_Info *info, int level, char *fmt, ...) { va_list args; if (level != 0 && !(level & level_mask)) return; va_start(args, fmt); fas216_do_log(info, fas216_target(info), fmt, args); va_end(args); printk("\n"); } #define PH_SIZE 32 static struct { int stat, ssr, isr, ph; } ph_list[PH_SIZE]; static int ph_ptr; static void add_debug_list(int stat, int ssr, int isr, int ph) { ph_list[ph_ptr].stat = stat; ph_list[ph_ptr].ssr = ssr; ph_list[ph_ptr].isr = isr; ph_list[ph_ptr].ph = ph; ph_ptr = (ph_ptr + 1) & (PH_SIZE-1); } static struct { int command; void *from; } cmd_list[8]; static int cmd_ptr; static void fas216_cmd(FAS216_Info *info, unsigned int command) { cmd_list[cmd_ptr].command = command; cmd_list[cmd_ptr].from = __builtin_return_address(0); cmd_ptr = (cmd_ptr + 1) & 7; fas216_writeb(info, REG_CMD, command); } static void print_debug_list(void) { int i; i = ph_ptr; printk(KERN_ERR "SCSI IRQ trail\n"); do { printk(" %02x:%02x:%02x:%1x", ph_list[i].stat, ph_list[i].ssr, ph_list[i].isr, ph_list[i].ph); i = (i + 1) & (PH_SIZE - 1); if (((i ^ ph_ptr) & 7) == 0) printk("\n"); } while (i != ph_ptr); if ((i ^ ph_ptr) & 7) printk("\n"); i = cmd_ptr; printk(KERN_ERR "FAS216 commands: "); do { printk("%02x:%p ", cmd_list[i].command, cmd_list[i].from); i = (i + 1) & 7; } while (i != cmd_ptr); printk("\n"); } static void fas216_done(FAS216_Info *info, unsigned int result); /** * fas216_get_last_msg - retrive last message from the list * @info: interface to search * @pos: current fifo position * * Retrieve a last message from the list, using position in fifo. */ static inline unsigned short fas216_get_last_msg(FAS216_Info *info, int pos) { unsigned short packed_msg = NOP; struct message *msg; int msgnr = 0; while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) { if (pos >= msg->fifo) break; } if (msg) { if (msg->msg[0] == EXTENDED_MESSAGE) packed_msg = EXTENDED_MESSAGE | msg->msg[2] << 8; else packed_msg = msg->msg[0]; } fas216_log(info, LOG_MESSAGES, "Message: %04x found at position %02x\n", packed_msg, pos); return packed_msg; } /** * fas216_syncperiod - calculate STP register value * @info: state structure for interface connected to device * @ns: period in ns (between subsequent bytes) * * Calculate value to be loaded into the STP register for a given period * in ns. Returns a value suitable for REG_STP. */ static int fas216_syncperiod(FAS216_Info *info, int ns) { int value = (info->ifcfg.clockrate * ns) / 1000; fas216_checkmagic(info); if (value < 4) value = 4; else if (value > 35) value = 35; return value & 31; } /** * fas216_set_sync - setup FAS216 chip for specified transfer period. * @info: state structure for interface connected to device * @target: target * * Correctly setup FAS216 chip for specified transfer period. * Notes : we need to switch the chip out of FASTSCSI mode if we have * a transfer period >= 200ns - otherwise the chip will violate * the SCSI timings. */ static void fas216_set_sync(FAS216_Info *info, int target) { unsigned int cntl3; fas216_writeb(info, REG_SOF, info->device[target].sof); fas216_writeb(info, REG_STP, info->device[target].stp); cntl3 = info->scsi.cfg[2]; if (info->device[target].period >= (200 / 4)) cntl3 = cntl3 & ~CNTL3_FASTSCSI; fas216_writeb(info, REG_CNTL3, cntl3); } /* Synchronous transfer support * * Note: The SCSI II r10 spec says (5.6.12): * * (2) Due to historical problems with early host adapters that could * not accept an SDTR message, some targets may not initiate synchronous * negotiation after a power cycle as required by this standard. Host * adapters that support synchronous mode may avoid the ensuing failure * modes when the target is independently power cycled by initiating a * synchronous negotiation on each REQUEST SENSE and INQUIRY command. * This approach increases the SCSI bus overhead and is not recommended * for new implementations. The correct method is to respond to an * SDTR message with a MESSAGE REJECT message if the either the * initiator or target devices does not support synchronous transfers * or does not want to negotiate for synchronous transfers at the time. * Using the correct method assures compatibility with wide data * transfers and future enhancements. * * We will always initiate a synchronous transfer negotiation request on * every INQUIRY or REQUEST SENSE message, unless the target itself has * at some point performed a synchronous transfer negotiation request, or * we have synchronous transfers disabled for this device. */ /** * fas216_handlesync - Handle a synchronous transfer message * @info: state structure for interface * @msg: message from target * * Handle a synchronous transfer message from the target */ static void fas216_handlesync(FAS216_Info *info, char *msg) { struct fas216_device *dev = &info->device[info->SCpnt->device->id]; enum { sync, async, none, reject } res = none; #ifdef SCSI2_SYNC switch (msg[0]) { case MESSAGE_REJECT: /* Synchronous transfer request failed. * Note: SCSI II r10: * * SCSI devices that are capable of synchronous * data transfers shall not respond to an SDTR * message with a MESSAGE REJECT message. * * Hence, if we get this condition, we disable * negotiation for this device. */ if (dev->sync_state == neg_inprogress) { dev->sync_state = neg_invalid; res = async; } break; case EXTENDED_MESSAGE: switch (dev->sync_state) { /* We don't accept synchronous transfer requests. * Respond with a MESSAGE_REJECT to prevent a * synchronous transfer agreement from being reached. */ case neg_invalid: res = reject; break; /* We were not negotiating a synchronous transfer, * but the device sent us a negotiation request. * Honour the request by sending back a SDTR * message containing our capability, limited by * the targets capability. */ default: fas216_cmd(info, CMD_SETATN); if (msg[4] > info->ifcfg.sync_max_depth) msg[4] = info->ifcfg.sync_max_depth; if (msg[3] < 1000 / info->ifcfg.clockrate) msg[3] = 1000 / info->ifcfg.clockrate; msgqueue_flush(&info->scsi.msgs); msgqueue_addmsg(&info->scsi.msgs, 5, EXTENDED_MESSAGE, 3, EXTENDED_SDTR, msg[3], msg[4]); info->scsi.phase = PHASE_MSGOUT_EXPECT; /* This is wrong. The agreement is not in effect * until this message is accepted by the device */ dev->sync_state = neg_targcomplete; res = sync; break; /* We initiated the synchronous transfer negotiation, * and have successfully received a response from the * target. The synchronous transfer agreement has been * reached. Note: if the values returned are out of our * bounds, we must reject the message. */ case neg_inprogress: res = reject; if (msg[4] <= info->ifcfg.sync_max_depth && msg[3] >= 1000 / info->ifcfg.clockrate) { dev->sync_state = neg_complete; res = sync; } break; } } #else res = reject; #endif switch (res) { case sync: dev->period = msg[3]; dev->sof = msg[4]; dev->stp = fas216_syncperiod(info, msg[3] * 4); fas216_set_sync(info, info->SCpnt->device->id); break; case reject: fas216_cmd(info, CMD_SETATN); msgqueue_flush(&info->scsi.msgs); msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT); info->scsi.phase = PHASE_MSGOUT_EXPECT; fallthrough; case async: dev->period = info->ifcfg.asyncperiod / 4; dev->sof = 0; dev->stp = info->scsi.async_stp; fas216_set_sync(info, info->SCpnt->device->id); break; case none: break; } } /** * fas216_updateptrs - update data pointers after transfer suspended/paused * @info: interface's local pointer to update * @bytes_transferred: number of bytes transferred * * Update data pointers after transfer suspended/paused */ static void fas216_updateptrs(FAS216_Info *info, int bytes_transferred) { struct scsi_pointer *SCp = &info->scsi.SCp; fas216_checkmagic(info); BUG_ON(bytes_transferred < 0); SCp->phase -= bytes_transferred; while (bytes_transferred != 0) { if (SCp->this_residual > bytes_transferred) break; /* * We have used up this buffer. Move on to the * next buffer. */ bytes_transferred -= SCp->this_residual; if (!next_SCp(SCp) && bytes_transferred) { printk(KERN_WARNING "scsi%d.%c: out of buffers\n", info->host->host_no, '0' + info->SCpnt->device->id); return; } } SCp->this_residual -= bytes_transferred; if (SCp->this_residual) SCp->ptr += bytes_transferred; else SCp->ptr = NULL; } /** * fas216_pio - transfer data off of/on to card using programmed IO * @info: interface to transfer data to/from * @direction: direction to transfer data (DMA_OUT/DMA_IN) * * Transfer data off of/on to card using programmed IO. * Notes: this is incredibly slow. */ static void fas216_pio(FAS216_Info *info, fasdmadir_t direction) { struct scsi_pointer *SCp = &info->scsi.SCp; fas216_checkmagic(info); if (direction == DMA_OUT) fas216_writeb(info, REG_FF, get_next_SCp_byte(SCp)); else put_next_SCp_byte(SCp, fas216_readb(info, REG_FF)); if (SCp->this_residual == 0) next_SCp(SCp); } static void fas216_set_stc(FAS216_Info *info, unsigned int length) { fas216_writeb(info, REG_STCL, length); fas216_writeb(info, REG_STCM, length >> 8); fas216_writeb(info, REG_STCH, length >> 16); } static unsigned int fas216_get_ctc(FAS216_Info *info) { return fas216_readb(info, REG_CTCL) + (fas216_readb(info, REG_CTCM) << 8) + (fas216_readb(info, REG_CTCH) << 16); } /** * fas216_cleanuptransfer - clean up after a transfer has completed. * @info: interface to clean up * * Update the data pointers according to the number of bytes transferred * on the SCSI bus. */ static void fas216_cleanuptransfer(FAS216_Info *info) { unsigned long total, residual, fifo; fasdmatype_t dmatype = info->dma.transfer_type; info->dma.transfer_type = fasdma_none; /* * PIO transfers do not need to be cleaned up. */ if (dmatype == fasdma_pio || dmatype == fasdma_none) return; if (dmatype == fasdma_real_all) total = info->scsi.SCp.phase; else total = info->scsi.SCp.this_residual; residual = fas216_get_ctc(info); fifo = fas216_readb(info, REG_CFIS) & CFIS_CF; fas216_log(info, LOG_BUFFER, "cleaning up from previous " "transfer: length 0x%06x, residual 0x%x, fifo %d", total, residual, fifo); /* * If we were performing Data-Out, the transfer counter * counts down each time a byte is transferred by the * host to the FIFO. This means we must include the * bytes left in the FIFO from the transfer counter. */ if (info->scsi.phase == PHASE_DATAOUT) residual += fifo; fas216_updateptrs(info, total - residual); } /** * fas216_transfer - Perform a DMA/PIO transfer off of/on to card * @info: interface from which device disconnected from * * Start a DMA/PIO transfer off of/on to card */ static void fas216_transfer(FAS216_Info *info) { fasdmadir_t direction; fasdmatype_t dmatype; fas216_log(info, LOG_BUFFER, "starttransfer: buffer %p length 0x%06x reqlen 0x%06x", info->scsi.SCp.ptr, info->scsi.SCp.this_residual, info->scsi.SCp.phase); if (!info->scsi.SCp.ptr) { fas216_log(info, LOG_ERROR, "null buffer passed to " "fas216_starttransfer"); print_SCp(&info->scsi.SCp, "SCp: ", "\n"); print_SCp(arm_scsi_pointer(info->SCpnt), "Cmnd SCp: ", "\n"); return; } /* * If we have a synchronous transfer agreement in effect, we must * use DMA mode. If we are using asynchronous transfers, we may * use DMA mode or PIO mode. */ if (info->device[info->SCpnt->device->id].sof) dmatype = fasdma_real_all; else dmatype = fasdma_pio; if (info->scsi.phase == PHASE_DATAOUT) direction = DMA_OUT; else direction = DMA_IN; if (info->dma.setup) dmatype = info->dma.setup(info->host, &info->scsi.SCp, direction, dmatype); info->dma.transfer_type = dmatype; if (dmatype == fasdma_real_all) fas216_set_stc(info, info->scsi.SCp.phase); else fas216_set_stc(info, info->scsi.SCp.this_residual); switch (dmatype) { case fasdma_pio: fas216_log(info, LOG_BUFFER, "PIO transfer"); fas216_writeb(info, REG_SOF, 0); fas216_writeb(info, REG_STP, info->scsi.async_stp); fas216_cmd(info, CMD_TRANSFERINFO); fas216_pio(info, direction); break; case fasdma_pseudo: fas216_log(info, LOG_BUFFER, "pseudo transfer"); fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA); info->dma.pseudo(info->host, &info->scsi.SCp, direction, info->SCpnt->transfersize); break; case fasdma_real_block: fas216_log(info, LOG_BUFFER, "block dma transfer"); fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA); break; case fasdma_real_all: fas216_log(info, LOG_BUFFER, "total dma transfer"); fas216_cmd(info, CMD_TRANSFERINFO | CMD_WITHDMA); break; default: fas216_log(info, LOG_BUFFER | LOG_ERROR, "invalid FAS216 DMA type"); break; } } /** * fas216_stoptransfer - Stop a DMA transfer onto / off of the card * @info: interface from which device disconnected from * * Called when we switch away from DATA IN or DATA OUT phases. */ static void fas216_stoptransfer(FAS216_Info *info) { fas216_checkmagic(info); if (info->dma.transfer_type == fasdma_real_all || info->dma.transfer_type == fasdma_real_block) info->dma.stop(info->host, &info->scsi.SCp); fas216_cleanuptransfer(info); if (info->scsi.phase == PHASE_DATAIN) { unsigned int fifo; /* * If we were performing Data-In, then the FIFO counter * contains the number of bytes not transferred via DMA * from the on-board FIFO. Read them manually. */ fifo = fas216_readb(info, REG_CFIS) & CFIS_CF; while (fifo && info->scsi.SCp.ptr) { *info->scsi.SCp.ptr = fas216_readb(info, REG_FF); fas216_updateptrs(info, 1); fifo--; } } else { /* * After a Data-Out phase, there may be unsent * bytes left in the FIFO. Flush them out. */ fas216_cmd(info, CMD_FLUSHFIFO); } } static void fas216_aborttransfer(FAS216_Info *info) { fas216_checkmagic(info); if (info->dma.transfer_type == fasdma_real_all || info->dma.transfer_type == fasdma_real_block) info->dma.stop(info->host, &info->scsi.SCp); info->dma.transfer_type = fasdma_none; fas216_cmd(info, CMD_FLUSHFIFO); } static void fas216_kick(FAS216_Info *info); /** * fas216_disconnected_intr - handle device disconnection * @info: interface from which device disconnected from * * Handle device disconnection */ static void fas216_disconnect_intr(FAS216_Info *info) { unsigned long flags; fas216_checkmagic(info); fas216_log(info, LOG_CONNECT, "disconnect phase=%02x", info->scsi.phase); msgqueue_flush(&info->scsi.msgs); switch (info->scsi.phase) { case PHASE_SELECTION: /* while selecting - no target */ case PHASE_SELSTEPS: fas216_done(info, DID_NO_CONNECT); break; case PHASE_MSGIN_DISCONNECT: /* message in - disconnecting */ info->scsi.disconnectable = 1; info->scsi.phase = PHASE_IDLE; info->stats.disconnects += 1; spin_lock_irqsave(&info->host_lock, flags); if (info->scsi.phase == PHASE_IDLE) fas216_kick(info); spin_unlock_irqrestore(&info->host_lock, flags); break; case PHASE_DONE: /* at end of command - complete */ fas216_done(info, DID_OK); break; case PHASE_MSGOUT: /* message out - possible ABORT message */ if (fas216_get_last_msg(info, info->scsi.msgin_fifo) == ABORT) { info->scsi.aborting = 0; fas216_done(info, DID_ABORT); break; } fallthrough; default: /* huh? */ printk(KERN_ERR "scsi%d.%c: unexpected disconnect in phase %s\n", info->host->host_no, fas216_target(info), fas216_drv_phase(info)); print_debug_list(); fas216_stoptransfer(info); fas216_done(info, DID_ERROR); break; } } /** * fas216_reselected_intr - start reconnection of a device * @info: interface which was reselected * * Start reconnection of a device */ static void fas216_reselected_intr(FAS216_Info *info) { unsigned int cfis, i; unsigned char msg[4]; unsigned char target, lun, tag; fas216_checkmagic(info); WARN_ON(info->scsi.phase == PHASE_SELECTION || info->scsi.phase == PHASE_SELSTEPS); cfis = fas216_readb(info, REG_CFIS); fas216_log(info, LOG_CONNECT, "reconnect phase=%02x cfis=%02x", info->scsi.phase, cfis); cfis &= CFIS_CF; if (cfis < 2 || cfis > 4) { printk(KERN_ERR "scsi%d.H: incorrect number of bytes after reselect\n", info->host->host_no); goto bad_message; } for (i = 0; i < cfis; i++) msg[i] = fas216_readb(info, REG_FF); if (!(msg[0] & (1 << info->host->this_id)) || !(msg[1] & 0x80)) goto initiator_error; target = msg[0] & ~(1 << info->host->this_id); target = ffs(target) - 1; lun = msg[1] & 7; tag = 0; if (cfis >= 3) { if (msg[2] != SIMPLE_QUEUE_TAG) goto initiator_error; tag = msg[3]; } /* set up for synchronous transfers */ fas216_writeb(info, REG_SDID, target); fas216_set_sync(info, target); msgqueue_flush(&info->scsi.msgs); fas216_log(info, LOG_CONNECT, "Reconnected: target %1x lun %1x tag %02x", target, lun, tag); if (info->scsi.disconnectable && info->SCpnt) { info->scsi.disconnectable = 0; if (info->SCpnt->device->id == target && info->SCpnt->device->lun == lun && scsi_cmd_to_rq(info->SCpnt)->tag == tag) { fas216_log(info, LOG_CONNECT, "reconnected previously executing command"); } else { queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt); fas216_log(info, LOG_CONNECT, "had to move command to disconnected queue"); info->SCpnt = NULL; } } if (!info->SCpnt) { info->SCpnt = queue_remove_tgtluntag(&info->queues.disconnected, target, lun, tag); fas216_log(info, LOG_CONNECT, "had to get command"); } if (info->SCpnt) { /* * Restore data pointer from SAVED data pointer */ info->scsi.SCp = *arm_scsi_pointer(info->SCpnt); fas216_log(info, LOG_CONNECT, "data pointers: [%p, %X]", info->scsi.SCp.ptr, info->scsi.SCp.this_residual); info->scsi.phase = PHASE_MSGIN; } else { /* * Our command structure not found - abort the * command on the target. Since we have no * record of this command, we can't send * an INITIATOR DETECTED ERROR message. */ fas216_cmd(info, CMD_SETATN); #if 0 if (tag) msgqueue_addmsg(&info->scsi.msgs, 2, ABORT_TAG, tag); else #endif msgqueue_addmsg(&info->scsi.msgs, 1, ABORT); info->scsi.phase = PHASE_MSGOUT_EXPECT; info->scsi.aborting = 1; } fas216_cmd(info, CMD_MSGACCEPTED); return; initiator_error: printk(KERN_ERR "scsi%d.H: error during reselection: bytes", info->host->host_no); for (i = 0; i < cfis; i++) printk(" %02x", msg[i]); printk("\n"); bad_message: fas216_cmd(info, CMD_SETATN); msgqueue_flush(&info->scsi.msgs); msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR); info->scsi.phase = PHASE_MSGOUT_EXPECT; fas216_cmd(info, CMD_MSGACCEPTED); } static void fas216_parse_message(FAS216_Info *info, unsigned char *message, int msglen) { struct scsi_pointer *scsi_pointer; int i; switch (message[0]) { case COMMAND_COMPLETE: if (msglen != 1) goto unrecognised; printk(KERN_ERR "scsi%d.%c: command complete with no " "status in MESSAGE_IN?\n", info->host->host_no, fas216_target(info)); break; case SAVE_POINTERS: if (msglen != 1) goto unrecognised; /* * Save current data pointer to SAVED data pointer * SCSI II standard says that we must not acknowledge * this until we have really saved pointers. * NOTE: we DO NOT save the command nor status pointers * as required by the SCSI II standard. These always * point to the start of their respective areas. */ scsi_pointer = arm_scsi_pointer(info->SCpnt); *scsi_pointer = info->scsi.SCp; scsi_pointer->sent_command = 0; fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER, "save data pointers: [%p, %X]", info->scsi.SCp.ptr, info->scsi.SCp.this_residual); break; case RESTORE_POINTERS: if (msglen != 1) goto unrecognised; /* * Restore current data pointer from SAVED data pointer */ info->scsi.SCp = *arm_scsi_pointer(info->SCpnt); fas216_log(info, LOG_CONNECT | LOG_MESSAGES | LOG_BUFFER, "restore data pointers: [%p, 0x%x]", info->scsi.SCp.ptr, info->scsi.SCp.this_residual); break; case DISCONNECT: if (msglen != 1) goto unrecognised; info->scsi.phase = PHASE_MSGIN_DISCONNECT; break; case MESSAGE_REJECT: if (msglen != 1) goto unrecognised; switch (fas216_get_last_msg(info, info->scsi.msgin_fifo)) { case EXTENDED_MESSAGE | EXTENDED_SDTR << 8: fas216_handlesync(info, message); break; default: fas216_log(info, 0, "reject, last message 0x%04x", fas216_get_last_msg(info, info->scsi.msgin_fifo)); } break; case NOP: break; case EXTENDED_MESSAGE: if (msglen < 3) goto unrecognised; switch (message[2]) { case EXTENDED_SDTR: /* Sync transfer negotiation request/reply */ fas216_handlesync(info, message); break; default: goto unrecognised; } break; default: goto unrecognised; } return; unrecognised: fas216_log(info, 0, "unrecognised message, rejecting"); printk("scsi%d.%c: message was", info->host->host_no, fas216_target(info)); for (i = 0; i < msglen; i++) printk("%s%02X", i & 31 ? " " : "\n ", message[i]); printk("\n"); /* * Something strange seems to be happening here - * I can't use SETATN since the chip gives me an * invalid command interrupt when I do. Weird. */ fas216_cmd(info, CMD_NOP); fas216_dumpstate(info); fas216_cmd(info, CMD_SETATN); msgqueue_flush(&info->scsi.msgs); msgqueue_addmsg(&info->scsi.msgs, 1, MESSAGE_REJECT); info->scsi.phase = PHASE_MSGOUT_EXPECT; fas216_dumpstate(info); } static int fas216_wait_cmd(FAS216_Info *info, int cmd) { int tout; int stat; fas216_cmd(info, cmd); for (tout = 1000; tout; tout -= 1) { stat = fas216_readb(info, REG_STAT); if (stat & (STAT_INT|STAT_PARITYERROR)) break; udelay(1); } return stat; } static int fas216_get_msg_byte(FAS216_Info *info) { unsigned int stat = fas216_wait_cmd(info, CMD_MSGACCEPTED); if ((stat & STAT_INT) == 0) goto timedout; if ((stat & STAT_BUSMASK) != STAT_MESGIN) goto unexpected_phase_change; fas216_readb(info, REG_INST); stat = fas216_wait_cmd(info, CMD_TRANSFERINFO); if ((stat & STAT_INT) == 0) goto timedout; if (stat & STAT_PARITYERROR) goto parity_error; if ((stat & STAT_BUSMASK) != STAT_MESGIN) goto unexpected_phase_change; fas216_readb(info, REG_INST); return fas216_readb(info, REG_FF); timedout: fas216_log(info, LOG_ERROR, "timed out waiting for message byte"); return -1; unexpected_phase_change: fas216_log(info, LOG_ERROR, "unexpected phase change: status = %02x", stat); return -2; parity_error: fas216_log(info, LOG_ERROR, "parity error during message in phase"); return -3; } /** * fas216_message - handle a function done interrupt from FAS216 chip * @info: interface which caused function done interrupt * * Handle a function done interrupt from FAS216 chip */ static void fas216_message(FAS216_Info *info) { unsigned char *message = info->scsi.message; unsigned int msglen = 1; int msgbyte = 0; fas216_checkmagic(info); message[0] = fas216_readb(info, REG_FF); if (message[0] == EXTENDED_MESSAGE) { msgbyte = fas216_get_msg_byte(info); if (msgbyte >= 0) { message[1] = msgbyte; for (msglen = 2; msglen < message[1] + 2; msglen++) { msgbyte = fas216_get_msg_byte(info); if (msgbyte >= 0) message[msglen] = msgbyte; else break; } } } if (msgbyte == -3) goto parity_error; #ifdef DEBUG_MESSAGES { int i; printk("scsi%d.%c: message in: ", info->host->host_no, fas216_target(info)); for (i = 0; i < msglen; i++) printk("%02X ", message[i]); printk("\n"); } #endif fas216_parse_message(info, message, msglen); fas216_cmd(info, CMD_MSGACCEPTED); return; parity_error: fas216_cmd(info, CMD_SETATN); msgqueue_flush(&info->scsi.msgs); msgqueue_addmsg(&info->scsi.msgs, 1, MSG_PARITY_ERROR); info->scsi.phase = PHASE_MSGOUT_EXPECT; fas216_cmd(info, CMD_MSGACCEPTED); return; } /** * fas216_send_command - send command after all message bytes have been sent * @info: interface which caused bus service * * Send a command to a target after all message bytes have been sent */ static void fas216_send_command(FAS216_Info *info) { int i; fas216_checkmagic(info); fas216_cmd(info, CMD_NOP|CMD_WITHDMA); fas216_cmd(info, CMD_FLUSHFIFO); /* load command */ for (i = info->scsi.SCp.sent_command; i < info->SCpnt->cmd_len; i++) fas216_writeb(info, REG_FF, info->SCpnt->cmnd[i]); fas216_cmd(info, CMD_TRANSFERINFO); info->scsi.phase = PHASE_COMMAND; } /** * fas216_send_messageout - handle bus service to send a message * @info: interface which caused bus service * * Handle bus service to send a message. * Note: We do not allow the device to change the data direction! */ static void fas216_send_messageout(FAS216_Info *info, int start) { unsigned int tot_msglen = msgqueue_msglength(&info->scsi.msgs); fas216_checkmagic(info); fas216_cmd(info, CMD_FLUSHFIFO); if (tot_msglen) { struct message *msg; int msgnr = 0; while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) { int i; for (i = start; i < msg->length; i++) fas216_writeb(info, REG_FF, msg->msg[i]); msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF); start = 0; } } else fas216_writeb(info, REG_FF, NOP); fas216_cmd(info, CMD_TRANSFERINFO); info->scsi.phase = PHASE_MSGOUT; } /** * fas216_busservice_intr - handle bus service interrupt from FAS216 chip * @info: interface which caused bus service interrupt * @stat: Status register contents * @is: SCSI Status register contents * * Handle a bus service interrupt from FAS216 chip */ static void fas216_busservice_intr(FAS216_Info *info, unsigned int stat, unsigned int is) { fas216_checkmagic(info); fas216_log(info, LOG_BUSSERVICE, "bus service: stat=%02x is=%02x phase=%02x", stat, is, info->scsi.phase); switch (info->scsi.phase) { case PHASE_SELECTION: if ((is & IS_BITS) != IS_MSGBYTESENT) goto bad_is; break; case PHASE_SELSTEPS: switch (is & IS_BITS) { case IS_SELARB: case IS_MSGBYTESENT: goto bad_is; case IS_NOTCOMMAND: case IS_EARLYPHASE: if ((stat & STAT_BUSMASK) == STAT_MESGIN) break; goto bad_is; case IS_COMPLETE: break; } break; default: break; } fas216_cmd(info, CMD_NOP); #define STATE(st,ph) ((ph) << 3 | (st)) /* This table describes the legal SCSI state transitions, * as described by the SCSI II spec. */ switch (STATE(stat & STAT_BUSMASK, info->scsi.phase)) { case STATE(STAT_DATAIN, PHASE_SELSTEPS):/* Sel w/ steps -> Data In */ case STATE(STAT_DATAIN, PHASE_MSGOUT): /* Message Out -> Data In */ case STATE(STAT_DATAIN, PHASE_COMMAND): /* Command -> Data In */ case STATE(STAT_DATAIN, PHASE_MSGIN): /* Message In -> Data In */ info->scsi.phase = PHASE_DATAIN; fas216_transfer(info); return; case STATE(STAT_DATAIN, PHASE_DATAIN): /* Data In -> Data In */ case STATE(STAT_DATAOUT, PHASE_DATAOUT):/* Data Out -> Data Out */ fas216_cleanuptransfer(info); fas216_transfer(info); return; case STATE(STAT_DATAOUT, PHASE_SELSTEPS):/* Sel w/ steps-> Data Out */ case STATE(STAT_DATAOUT, PHASE_MSGOUT): /* Message Out -> Data Out */ case STATE(STAT_DATAOUT, PHASE_COMMAND):/* Command -> Data Out */ case STATE(STAT_DATAOUT, PHASE_MSGIN): /* Message In -> Data Out */ fas216_cmd(info, CMD_FLUSHFIFO); info->scsi.phase = PHASE_DATAOUT; fas216_transfer(info); return; case STATE(STAT_STATUS, PHASE_DATAOUT): /* Data Out -> Status */ case STATE(STAT_STATUS, PHASE_DATAIN): /* Data In -> Status */ fas216_stoptransfer(info); fallthrough; case STATE(STAT_STATUS, PHASE_SELSTEPS):/* Sel w/ steps -> Status */ case STATE(STAT_STATUS, PHASE_MSGOUT): /* Message Out -> Status */ case STATE(STAT_STATUS, PHASE_COMMAND): /* Command -> Status */ case STATE(STAT_STATUS, PHASE_MSGIN): /* Message In -> Status */ fas216_cmd(info, CMD_INITCMDCOMPLETE); info->scsi.phase = PHASE_STATUS; return; case STATE(STAT_MESGIN, PHASE_DATAOUT): /* Data Out -> Message In */ case STATE(STAT_MESGIN, PHASE_DATAIN): /* Data In -> Message In */ fas216_stoptransfer(info); fallthrough; case STATE(STAT_MESGIN, PHASE_COMMAND): /* Command -> Message In */ case STATE(STAT_MESGIN, PHASE_SELSTEPS):/* Sel w/ steps -> Message In */ case STATE(STAT_MESGIN, PHASE_MSGOUT): /* Message Out -> Message In */ info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF; fas216_cmd(info, CMD_FLUSHFIFO); fas216_cmd(info, CMD_TRANSFERINFO); info->scsi.phase = PHASE_MSGIN; return; case STATE(STAT_MESGIN, PHASE_MSGIN): info->scsi.msgin_fifo = fas216_readb(info, REG_CFIS) & CFIS_CF; fas216_cmd(info, CMD_TRANSFERINFO); return; case STATE(STAT_COMMAND, PHASE_MSGOUT): /* Message Out -> Command */ case STATE(STAT_COMMAND, PHASE_MSGIN): /* Message In -> Command */ fas216_send_command(info); info->scsi.phase = PHASE_COMMAND; return; /* * Selection -> Message Out */ case STATE(STAT_MESGOUT, PHASE_SELECTION): fas216_send_messageout(info, 1); return; /* * Message Out -> Message Out */ case STATE(STAT_MESGOUT, PHASE_SELSTEPS): case STATE(STAT_MESGOUT, PHASE_MSGOUT): /* * If we get another message out phase, this usually * means some parity error occurred. Resend complete * set of messages. If we have more than one byte to * send, we need to assert ATN again. */ if (info->device[info->SCpnt->device->id].parity_check) { /* * We were testing... good, the device * supports parity checking. */ info->device[info->SCpnt->device->id].parity_check = 0; info->device[info->SCpnt->device->id].parity_enabled = 1; fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); } if (msgqueue_msglength(&info->scsi.msgs) > 1) fas216_cmd(info, CMD_SETATN); fallthrough; /* * Any -> Message Out */ case STATE(STAT_MESGOUT, PHASE_MSGOUT_EXPECT): fas216_send_messageout(info, 0); return; /* Error recovery rules. * These either attempt to abort or retry the operation. * TODO: we need more of these */ case STATE(STAT_COMMAND, PHASE_COMMAND):/* Command -> Command */ /* error - we've sent out all the command bytes * we have. * NOTE: we need SAVE DATA POINTERS/RESTORE DATA POINTERS * to include the command bytes sent for this to work * correctly. */ printk(KERN_ERR "scsi%d.%c: " "target trying to receive more command bytes\n", info->host->host_no, fas216_target(info)); fas216_cmd(info, CMD_SETATN); fas216_set_stc(info, 15); fas216_cmd(info, CMD_PADBYTES | CMD_WITHDMA); msgqueue_flush(&info->scsi.msgs); msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR); info->scsi.phase = PHASE_MSGOUT_EXPECT; return; } if (info->scsi.phase == PHASE_MSGIN_DISCONNECT) { printk(KERN_ERR "scsi%d.%c: disconnect message received, but bus service %s?\n", info->host->host_no, fas216_target(info), fas216_bus_phase(stat)); msgqueue_flush(&info->scsi.msgs); fas216_cmd(info, CMD_SETATN); msgqueue_addmsg(&info->scsi.msgs, 1, INITIATOR_ERROR); info->scsi.phase = PHASE_MSGOUT_EXPECT; info->scsi.aborting = 1; fas216_cmd(info, CMD_TRANSFERINFO); return; } printk(KERN_ERR "scsi%d.%c: bus phase %s after %s?\n", info->host->host_no, fas216_target(info), fas216_bus_phase(stat), fas216_drv_phase(info)); print_debug_list(); return; bad_is: fas216_log(info, 0, "bus service at step %d?", is & IS_BITS); fas216_dumpstate(info); print_debug_list(); fas216_done(info, DID_ERROR); } /** * fas216_funcdone_intr - handle a function done interrupt from FAS216 chip * @info: interface which caused function done interrupt * @stat: Status register contents * @is: SCSI Status register contents * * Handle a function done interrupt from FAS216 chip */ static void fas216_funcdone_intr(FAS216_Info *info, unsigned int stat, unsigned int is) { unsigned int fifo_len = fas216_readb(info, REG_CFIS) & CFIS_CF; fas216_checkmagic(info); fas216_log(info, LOG_FUNCTIONDONE, "function done: stat=%02x is=%02x phase=%02x", stat, is, info->scsi.phase); switch (info->scsi.phase) { case PHASE_STATUS: /* status phase - read status and msg */ if (fifo_len != 2) { fas216_log(info, 0, "odd number of bytes in FIFO: %d", fifo_len); } /* * Read status then message byte. */ info->scsi.SCp.Status = fas216_readb(info, REG_FF); info->scsi.SCp.Message = fas216_readb(info, REG_FF); info->scsi.phase = PHASE_DONE; fas216_cmd(info, CMD_MSGACCEPTED); break; case PHASE_IDLE: case PHASE_SELECTION: case PHASE_SELSTEPS: break; case PHASE_MSGIN: /* message in phase */ if ((stat & STAT_BUSMASK) == STAT_MESGIN) { info->scsi.msgin_fifo = fifo_len; fas216_message(info); break; } fallthrough; default: fas216_log(info, 0, "internal phase %s for function done?" " What do I do with this?", fas216_target(info), fas216_drv_phase(info)); } } static void fas216_bus_reset(FAS216_Info *info) { neg_t sync_state; int i; msgqueue_flush(&info->scsi.msgs); sync_state = neg_invalid; #ifdef SCSI2_SYNC if (info->ifcfg.capabilities & (FASCAP_DMA|FASCAP_PSEUDODMA)) sync_state = neg_wait; #endif info->scsi.phase = PHASE_IDLE; info->SCpnt = NULL; /* bug! */ memset(&info->scsi.SCp, 0, sizeof(info->scsi.SCp)); for (i = 0; i < 8; i++) { info->device[i].disconnect_ok = info->ifcfg.disconnect_ok; info->device[i].sync_state = sync_state; info->device[i].period = info->ifcfg.asyncperiod / 4; info->device[i].stp = info->scsi.async_stp; info->device[i].sof = 0; info->device[i].wide_xfer = 0; } info->rst_bus_status = 1; wake_up(&info->eh_wait); } /** * fas216_intr - handle interrupts to progress a command * @info: interface to service * * Handle interrupts from the interface to progress a command */ irqreturn_t fas216_intr(FAS216_Info *info) { unsigned char inst, is, stat; int handled = IRQ_NONE; fas216_checkmagic(info); stat = fas216_readb(info, REG_STAT); is = fas216_readb(info, REG_IS); inst = fas216_readb(info, REG_INST); add_debug_list(stat, is, inst, info->scsi.phase); if (stat & STAT_INT) { if (inst & INST_BUSRESET) { fas216_log(info, 0, "bus reset detected"); fas216_bus_reset(info); scsi_report_bus_reset(info->host, 0); } else if (inst & INST_ILLEGALCMD) { fas216_log(info, LOG_ERROR, "illegal command given\n"); fas216_dumpstate(info); print_debug_list(); } else if (inst & INST_DISCONNECT) fas216_disconnect_intr(info); else if (inst & INST_RESELECTED) /* reselected */ fas216_reselected_intr(info); else if (inst & INST_BUSSERVICE) /* bus service request */ fas216_busservice_intr(info, stat, is); else if (inst & INST_FUNCDONE) /* function done */ fas216_funcdone_intr(info, stat, is); else fas216_log(info, 0, "unknown interrupt received:" " phase %s inst %02X is %02X stat %02X", fas216_drv_phase(info), inst, is, stat); handled = IRQ_HANDLED; } return handled; } static void __fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt) { int tot_msglen; /* following what the ESP driver says */ fas216_set_stc(info, 0); fas216_cmd(info, CMD_NOP | CMD_WITHDMA); /* flush FIFO */ fas216_cmd(info, CMD_FLUSHFIFO); /* load bus-id and timeout */ fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id)); fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout); /* synchronous transfers */ fas216_set_sync(info, SCpnt->device->id); tot_msglen = msgqueue_msglength(&info->scsi.msgs); #ifdef DEBUG_MESSAGES { struct message *msg; int msgnr = 0, i; printk("scsi%d.%c: message out: ", info->host->host_no, '0' + SCpnt->device->id); while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) { printk("{ "); for (i = 0; i < msg->length; i++) printk("%02x ", msg->msg[i]); printk("} "); } printk("\n"); } #endif if (tot_msglen == 1 || tot_msglen == 3) { /* * We have an easy message length to send... */ struct message *msg; int msgnr = 0, i; info->scsi.phase = PHASE_SELSTEPS; /* load message bytes */ while ((msg = msgqueue_getmsg(&info->scsi.msgs, msgnr++)) != NULL) { for (i = 0; i < msg->length; i++) fas216_writeb(info, REG_FF, msg->msg[i]); msg->fifo = tot_msglen - (fas216_readb(info, REG_CFIS) & CFIS_CF); } /* load command */ for (i = 0; i < SCpnt->cmd_len; i++) fas216_writeb(info, REG_FF, SCpnt->cmnd[i]); if (tot_msglen == 1) fas216_cmd(info, CMD_SELECTATN); else fas216_cmd(info, CMD_SELECTATN3); } else { /* * We have an unusual number of message bytes to send. * Load first byte into fifo, and issue SELECT with ATN and * stop steps. */ struct message *msg = msgqueue_getmsg(&info->scsi.msgs, 0); fas216_writeb(info, REG_FF, msg->msg[0]); msg->fifo = 1; fas216_cmd(info, CMD_SELECTATNSTOP); } } /* * Decide whether we need to perform a parity test on this device. * Can also be used to force parity error conditions during initial * information transfer phase (message out) for test purposes. */ static int parity_test(FAS216_Info *info, int target) { #if 0 if (target == 3) { info->device[target].parity_check = 0; return 1; } #endif return info->device[target].parity_check; } static void fas216_start_command(FAS216_Info *info, struct scsi_cmnd *SCpnt) { int disconnect_ok; /* * claim host busy */ info->scsi.phase = PHASE_SELECTION; info->scsi.SCp = *arm_scsi_pointer(SCpnt); info->SCpnt = SCpnt; info->dma.transfer_type = fasdma_none; if (parity_test(info, SCpnt->device->id)) fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_PTE); else fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); /* * Don't allow request sense commands to disconnect. */ disconnect_ok = SCpnt->cmnd[0] != REQUEST_SENSE && info->device[SCpnt->device->id].disconnect_ok; /* * build outgoing message bytes */ msgqueue_flush(&info->scsi.msgs); msgqueue_addmsg(&info->scsi.msgs, 1, IDENTIFY(disconnect_ok, SCpnt->device->lun)); /* * add tag message if required */ if (SCpnt->device->simple_tags) msgqueue_addmsg(&info->scsi.msgs, 2, SIMPLE_QUEUE_TAG, scsi_cmd_to_rq(SCpnt)->tag); do { #ifdef SCSI2_SYNC if ((info->device[SCpnt->device->id].sync_state == neg_wait || info->device[SCpnt->device->id].sync_state == neg_complete) && (SCpnt->cmnd[0] == REQUEST_SENSE || SCpnt->cmnd[0] == INQUIRY)) { info->device[SCpnt->device->id].sync_state = neg_inprogress; msgqueue_addmsg(&info->scsi.msgs, 5, EXTENDED_MESSAGE, 3, EXTENDED_SDTR, 1000 / info->ifcfg.clockrate, info->ifcfg.sync_max_depth); break; } #endif } while (0); __fas216_start_command(info, SCpnt); } static void fas216_allocate_tag(FAS216_Info *info, struct scsi_cmnd *SCpnt) { set_bit(SCpnt->device->id * 8 + (u8)(SCpnt->device->lun & 0x7), info->busyluns); info->stats.removes += 1; switch (SCpnt->cmnd[0]) { case WRITE_6: case WRITE_10: case WRITE_12: info->stats.writes += 1; break; case READ_6: case READ_10: case READ_12: info->stats.reads += 1; break; default: info->stats.miscs += 1; break; } } static void fas216_do_bus_device_reset(FAS216_Info *info, struct scsi_cmnd *SCpnt) { struct message *msg; /* * claim host busy */ info->scsi.phase = PHASE_SELECTION; info->scsi.SCp = *arm_scsi_pointer(SCpnt); info->SCpnt = SCpnt; info->dma.transfer_type = fasdma_none; fas216_log(info, LOG_ERROR, "sending bus device reset"); msgqueue_flush(&info->scsi.msgs); msgqueue_addmsg(&info->scsi.msgs, 1, BUS_DEVICE_RESET); /* following what the ESP driver says */ fas216_set_stc(info, 0); fas216_cmd(info, CMD_NOP | CMD_WITHDMA); /* flush FIFO */ fas216_cmd(info, CMD_FLUSHFIFO); /* load bus-id and timeout */ fas216_writeb(info, REG_SDID, BUSID(SCpnt->device->id)); fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout); /* synchronous transfers */ fas216_set_sync(info, SCpnt->device->id); msg = msgqueue_getmsg(&info->scsi.msgs, 0); fas216_writeb(info, REG_FF, BUS_DEVICE_RESET); msg->fifo = 1; fas216_cmd(info, CMD_SELECTATNSTOP); } /** * fas216_kick - kick a command to the interface * @info: our host interface to kick * * Kick a command to the interface, interface should be idle. * Notes: Interrupts are always disabled! */ static void fas216_kick(FAS216_Info *info) { struct scsi_cmnd *SCpnt = NULL; #define TYPE_OTHER 0 #define TYPE_RESET 1 #define TYPE_QUEUE 2 int where_from = TYPE_OTHER; fas216_checkmagic(info); /* * Obtain the next command to process. */ do { if (info->rstSCpnt) { SCpnt = info->rstSCpnt; /* don't remove it */ where_from = TYPE_RESET; break; } if (info->reqSCpnt) { SCpnt = info->reqSCpnt; info->reqSCpnt = NULL; break; } if (info->origSCpnt) { SCpnt = info->origSCpnt; info->origSCpnt = NULL; break; } /* retrieve next command */ if (!SCpnt) { SCpnt = queue_remove_exclude(&info->queues.issue, info->busyluns); where_from = TYPE_QUEUE; break; } } while (0); if (!SCpnt) { /* * no command pending, so enable reselection. */ fas216_cmd(info, CMD_ENABLESEL); return; } /* * We're going to start a command, so disable reselection */ fas216_cmd(info, CMD_DISABLESEL); if (info->scsi.disconnectable && info->SCpnt) { fas216_log(info, LOG_CONNECT, "moved command for %d to disconnected queue", info->SCpnt->device->id); queue_add_cmd_tail(&info->queues.disconnected, info->SCpnt); info->scsi.disconnectable = 0; info->SCpnt = NULL; } fas216_log_command(info, LOG_CONNECT | LOG_MESSAGES, SCpnt, "starting"); switch (where_from) { case TYPE_QUEUE: fas216_allocate_tag(info, SCpnt); fallthrough; case TYPE_OTHER: fas216_start_command(info, SCpnt); break; case TYPE_RESET: fas216_do_bus_device_reset(info, SCpnt); break; } fas216_log(info, LOG_CONNECT, "select: data pointers [%p, %X]", info->scsi.SCp.ptr, info->scsi.SCp.this_residual); /* * should now get either DISCONNECT or * (FUNCTION DONE with BUS SERVICE) interrupt */ } /* * Clean up from issuing a BUS DEVICE RESET message to a device. */ static void fas216_devicereset_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, unsigned int result) { fas216_log(info, LOG_ERROR, "fas216 device reset complete"); info->rstSCpnt = NULL; info->rst_dev_status = 1; wake_up(&info->eh_wait); } /** * fas216_rq_sns_done - Finish processing automatic request sense command * @info: interface that completed * @SCpnt: command that completed * @result: driver byte of result * * Finish processing automatic request sense command */ static void fas216_rq_sns_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, unsigned int result) { struct scsi_pointer *scsi_pointer = arm_scsi_pointer(SCpnt); fas216_log_target(info, LOG_CONNECT, SCpnt->device->id, "request sense complete, result=0x%04x%02x%02x", result, scsi_pointer->Message, scsi_pointer->Status); if (result != DID_OK || scsi_pointer->Status != SAM_STAT_GOOD) /* * Something went wrong. Make sure that we don't * have valid data in the sense buffer that could * confuse the higher levels. */ memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); //printk("scsi%d.%c: sense buffer: ", info->host->host_no, '0' + SCpnt->device->id); //{ int i; for (i = 0; i < 32; i++) printk("%02x ", SCpnt->sense_buffer[i]); printk("\n"); } /* * Note that we don't set SCpnt->result, since that should * reflect the status of the command that we were asked by * the upper layers to process. This would have been set * correctly by fas216_std_done. */ scsi_eh_restore_cmnd(SCpnt, &info->ses); fas216_cmd_priv(SCpnt)->scsi_done(SCpnt); } /** * fas216_std_done - finish processing of standard command * @info: interface that completed * @SCpnt: command that completed * @result: driver byte of result * * Finish processing of standard command */ static void fas216_std_done(FAS216_Info *info, struct scsi_cmnd *SCpnt, unsigned int result) { struct scsi_pointer *scsi_pointer = arm_scsi_pointer(SCpnt); info->stats.fins += 1; set_host_byte(SCpnt, result); if (result == DID_OK) scsi_msg_to_host_byte(SCpnt, info->scsi.SCp.Message); set_status_byte(SCpnt, info->scsi.SCp.Status); fas216_log_command(info, LOG_CONNECT, SCpnt, "command complete, result=0x%08x", SCpnt->result); /* * If the driver detected an error, we're all done. */ if (get_host_byte(SCpnt) != DID_OK) goto done; /* * If the command returned CHECK_CONDITION or COMMAND_TERMINATED * status, request the sense information. */ if (get_status_byte(SCpnt) == SAM_STAT_CHECK_CONDITION || get_status_byte(SCpnt) == SAM_STAT_COMMAND_TERMINATED) goto request_sense; /* * If the command did not complete with GOOD status, * we are all done here. */ if (get_status_byte(SCpnt) != SAM_STAT_GOOD) goto done; /* * We have successfully completed a command. Make sure that * we do not have any buffers left to transfer. The world * is not perfect, and we seem to occasionally hit this. * It can be indicative of a buggy driver, target or the upper * levels of the SCSI code. */ if (info->scsi.SCp.ptr) { switch (SCpnt->cmnd[0]) { case INQUIRY: case START_STOP: case MODE_SENSE: break; default: scmd_printk(KERN_ERR, SCpnt, "incomplete data transfer detected: res=%08X ptr=%p len=%X\n", SCpnt->result, info->scsi.SCp.ptr, info->scsi.SCp.this_residual); scsi_print_command(SCpnt); set_host_byte(SCpnt, DID_ERROR); goto request_sense; } } done: if (fas216_cmd_priv(SCpnt)->scsi_done) { fas216_cmd_priv(SCpnt)->scsi_done(SCpnt); return; } panic("scsi%d.H: null scsi_done function in fas216_done", info->host->host_no); request_sense: if (SCpnt->cmnd[0] == REQUEST_SENSE) goto done; scsi_eh_prep_cmnd(SCpnt, &info->ses, NULL, 0, ~0); fas216_log_target(info, LOG_CONNECT, SCpnt->device->id, "requesting sense"); init_SCp(SCpnt); scsi_pointer->Message = 0; scsi_pointer->Status = 0; SCpnt->host_scribble = (void *)fas216_rq_sns_done; /* * Place this command into the high priority "request * sense" slot. This will be the very next command * executed, unless a target connects to us. */ if (info->reqSCpnt) printk(KERN_WARNING "scsi%d.%c: losing request command\n", info->host->host_no, '0' + SCpnt->device->id); info->reqSCpnt = SCpnt; } /** * fas216_done - complete processing for current command * @info: interface that completed * @result: driver byte of result * * Complete processing for current command */ static void fas216_done(FAS216_Info *info, unsigned int result) { void (*fn)(FAS216_Info *, struct scsi_cmnd *, unsigned int); struct scsi_cmnd *SCpnt; unsigned long flags; fas216_checkmagic(info); if (!info->SCpnt) goto no_command; SCpnt = info->SCpnt; info->SCpnt = NULL; info->scsi.phase = PHASE_IDLE; if (info->scsi.aborting) { fas216_log(info, 0, "uncaught abort - returning DID_ABORT"); result = DID_ABORT; info->scsi.aborting = 0; } /* * Sanity check the completion - if we have zero bytes left * to transfer, we should not have a valid pointer. */ if (info->scsi.SCp.ptr && info->scsi.SCp.this_residual == 0) { scmd_printk(KERN_INFO, SCpnt, "zero bytes left to transfer, but buffer pointer still valid: ptr=%p len=%08x\n", info->scsi.SCp.ptr, info->scsi.SCp.this_residual); info->scsi.SCp.ptr = NULL; scsi_print_command(SCpnt); } /* * Clear down this command as completed. If we need to request * the sense information, fas216_kick will re-assert the busy * status. */ info->device[SCpnt->device->id].parity_check = 0; clear_bit(SCpnt->device->id * 8 + (u8)(SCpnt->device->lun & 0x7), info->busyluns); fn = (void (*)(FAS216_Info *, struct scsi_cmnd *, unsigned int))SCpnt->host_scribble; fn(info, SCpnt, result); if (info->scsi.irq) { spin_lock_irqsave(&info->host_lock, flags); if (info->scsi.phase == PHASE_IDLE) fas216_kick(info); spin_unlock_irqrestore(&info->host_lock, flags); } return; no_command: panic("scsi%d.H: null command in fas216_done", info->host->host_no); } /** * fas216_queue_command_internal - queue a command for the adapter to process * @SCpnt: Command to queue * @done: done function to call once command is complete * * Queue a command for adapter to process. * Returns: 0 on success, else error. * Notes: io_request_lock is held, interrupts are disabled. */ static int fas216_queue_command_internal(struct scsi_cmnd *SCpnt, void (*done)(struct scsi_cmnd *)) { FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; int result; fas216_checkmagic(info); fas216_log_command(info, LOG_CONNECT, SCpnt, "received command (%p)", SCpnt); fas216_cmd_priv(SCpnt)->scsi_done = done; SCpnt->host_scribble = (void *)fas216_std_done; SCpnt->result = 0; init_SCp(SCpnt); info->stats.queues += 1; spin_lock(&info->host_lock); /* * Add command into execute queue and let it complete under * whatever scheme we're using. */ result = !queue_add_cmd_ordered(&info->queues.issue, SCpnt); /* * If we successfully added the command, * kick the interface to get it moving. */ if (result == 0 && info->scsi.phase == PHASE_IDLE) fas216_kick(info); spin_unlock(&info->host_lock); fas216_log_target(info, LOG_CONNECT, -1, "queue %s", result ? "failure" : "success"); return result; } static int fas216_queue_command_lck(struct scsi_cmnd *SCpnt) { return fas216_queue_command_internal(SCpnt, scsi_done); } DEF_SCSI_QCMD(fas216_queue_command) /** * fas216_internal_done - trigger restart of a waiting thread in fas216_noqueue_command * @SCpnt: Command to wake * * Trigger restart of a waiting thread in fas216_command */ static void fas216_internal_done(struct scsi_cmnd *SCpnt) { FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; fas216_checkmagic(info); info->internal_done = 1; } /** * fas216_noqueue_command - process a command for the adapter. * @SCpnt: Command to queue * * Queue a command for adapter to process. * Returns: scsi result code. * Notes: io_request_lock is held, interrupts are disabled. */ static int fas216_noqueue_command_lck(struct scsi_cmnd *SCpnt) { FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; fas216_checkmagic(info); /* * We should only be using this if we don't have an interrupt. * Provide some "incentive" to use the queueing code. */ BUG_ON(info->scsi.irq); info->internal_done = 0; fas216_queue_command_internal(SCpnt, fas216_internal_done); /* * This wastes time, since we can't return until the command is * complete. We can't sleep either since we may get re-entered! * However, we must re-enable interrupts, or else we'll be * waiting forever. */ spin_unlock_irq(info->host->host_lock); while (!info->internal_done) { /* * If we don't have an IRQ, then we must poll the card for * it's interrupt, and use that to call this driver's * interrupt routine. That way, we keep the command * progressing. Maybe we can add some intelligence here * and go to sleep if we know that the device is going * to be some time (eg, disconnected). */ if (fas216_readb(info, REG_STAT) & STAT_INT) { spin_lock_irq(info->host->host_lock); fas216_intr(info); spin_unlock_irq(info->host->host_lock); } } spin_lock_irq(info->host->host_lock); scsi_done(SCpnt); return 0; } DEF_SCSI_QCMD(fas216_noqueue_command) /* * Error handler timeout function. Indicate that we timed out, * and wake up any error handler process so it can continue. */ static void fas216_eh_timer(struct timer_list *t) { FAS216_Info *info = from_timer(info, t, eh_timer); fas216_log(info, LOG_ERROR, "error handling timed out\n"); del_timer(&info->eh_timer); if (info->rst_bus_status == 0) info->rst_bus_status = -1; if (info->rst_dev_status == 0) info->rst_dev_status = -1; wake_up(&info->eh_wait); } enum res_find { res_failed, /* not found */ res_success, /* command on issue queue */ res_hw_abort /* command on disconnected dev */ }; /** * fas216_do_abort - decide how to abort a command * @SCpnt: command to abort * * Decide how to abort a command. * Returns: abort status */ static enum res_find fas216_find_command(FAS216_Info *info, struct scsi_cmnd *SCpnt) { enum res_find res = res_failed; if (queue_remove_cmd(&info->queues.issue, SCpnt)) { /* * The command was on the issue queue, and has not been * issued yet. We can remove the command from the queue, * and acknowledge the abort. Neither the device nor the * interface know about the command. */ printk("on issue queue "); res = res_success; } else if (queue_remove_cmd(&info->queues.disconnected, SCpnt)) { /* * The command was on the disconnected queue. We must * reconnect with the device if possible, and send it * an abort message. */ printk("on disconnected queue "); res = res_hw_abort; } else if (info->SCpnt == SCpnt) { printk("executing "); switch (info->scsi.phase) { /* * If the interface is idle, and the command is 'disconnectable', * then it is the same as on the disconnected queue. */ case PHASE_IDLE: if (info->scsi.disconnectable) { info->scsi.disconnectable = 0; info->SCpnt = NULL; res = res_hw_abort; } break; default: break; } } else if (info->origSCpnt == SCpnt) { /* * The command will be executed next, but a command * is currently using the interface. This is similar to * being on the issue queue, except the busylun bit has * been set. */ info->origSCpnt = NULL; clear_bit(SCpnt->device->id * 8 + (u8)(SCpnt->device->lun & 0x7), info->busyluns); printk("waiting for execution "); res = res_success; } else printk("unknown "); return res; } /** * fas216_eh_abort - abort this command * @SCpnt: command to abort * * Abort this command. * Returns: FAILED if unable to abort * Notes: io_request_lock is taken, and irqs are disabled */ int fas216_eh_abort(struct scsi_cmnd *SCpnt) { FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; int result = FAILED; fas216_checkmagic(info); info->stats.aborts += 1; scmd_printk(KERN_WARNING, SCpnt, "abort command\n"); print_debug_list(); fas216_dumpstate(info); switch (fas216_find_command(info, SCpnt)) { /* * We found the command, and cleared it out. Either * the command is still known to be executing on the * target, or the busylun bit is not set. */ case res_success: scmd_printk(KERN_WARNING, SCpnt, "abort %p success\n", SCpnt); result = SUCCESS; break; /* * We need to reconnect to the target and send it an * ABORT or ABORT_TAG message. We can only do this * if the bus is free. */ case res_hw_abort: /* * We are unable to abort the command for some reason. */ default: case res_failed: scmd_printk(KERN_WARNING, SCpnt, "abort %p failed\n", SCpnt); break; } return result; } /** * fas216_eh_device_reset - Reset the device associated with this command * @SCpnt: command specifing device to reset * * Reset the device associated with this command. * Returns: FAILED if unable to reset. * Notes: We won't be re-entered, so we'll only have one device * reset on the go at one time. */ int fas216_eh_device_reset(struct scsi_cmnd *SCpnt) { FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; unsigned long flags; int i, res = FAILED, target = SCpnt->device->id; fas216_log(info, LOG_ERROR, "device reset for target %d", target); spin_lock_irqsave(&info->host_lock, flags); do { /* * If we are currently connected to a device, and * it is the device we want to reset, there is * nothing we can do here. Chances are it is stuck, * and we need a bus reset. */ if (info->SCpnt && !info->scsi.disconnectable && info->SCpnt->device->id == SCpnt->device->id) break; /* * We're going to be resetting this device. Remove * all pending commands from the driver. By doing * so, we guarantee that we won't touch the command * structures except to process the reset request. */ queue_remove_all_target(&info->queues.issue, target); queue_remove_all_target(&info->queues.disconnected, target); if (info->origSCpnt && info->origSCpnt->device->id == target) info->origSCpnt = NULL; if (info->reqSCpnt && info->reqSCpnt->device->id == target) info->reqSCpnt = NULL; for (i = 0; i < 8; i++) clear_bit(target * 8 + i, info->busyluns); /* * Hijack this SCSI command structure to send * a bus device reset message to this device. */ SCpnt->host_scribble = (void *)fas216_devicereset_done; info->rst_dev_status = 0; info->rstSCpnt = SCpnt; if (info->scsi.phase == PHASE_IDLE) fas216_kick(info); mod_timer(&info->eh_timer, jiffies + 30 * HZ); spin_unlock_irqrestore(&info->host_lock, flags); /* * Wait up to 30 seconds for the reset to complete. */ wait_event(info->eh_wait, info->rst_dev_status); del_timer_sync(&info->eh_timer); spin_lock_irqsave(&info->host_lock, flags); info->rstSCpnt = NULL; if (info->rst_dev_status == 1) res = SUCCESS; } while (0); SCpnt->host_scribble = NULL; spin_unlock_irqrestore(&info->host_lock, flags); fas216_log(info, LOG_ERROR, "device reset complete: %s\n", res == SUCCESS ? "success" : "failed"); return res; } /** * fas216_eh_bus_reset - Reset the bus associated with the command * @SCpnt: command specifing bus to reset * * Reset the bus associated with the command. * Returns: FAILED if unable to reset. * Notes: Further commands are blocked. */ int fas216_eh_bus_reset(struct scsi_cmnd *SCpnt) { FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; unsigned long flags; struct scsi_device *SDpnt; fas216_checkmagic(info); fas216_log(info, LOG_ERROR, "resetting bus"); info->stats.bus_resets += 1; spin_lock_irqsave(&info->host_lock, flags); /* * Stop all activity on this interface. */ fas216_aborttransfer(info); fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]); /* * Clear any pending interrupts. */ while (fas216_readb(info, REG_STAT) & STAT_INT) fas216_readb(info, REG_INST); info->rst_bus_status = 0; /* * For each attached hard-reset device, clear out * all command structures. Leave the running * command in place. */ shost_for_each_device(SDpnt, info->host) { int i; if (SDpnt->soft_reset) continue; queue_remove_all_target(&info->queues.issue, SDpnt->id); queue_remove_all_target(&info->queues.disconnected, SDpnt->id); if (info->origSCpnt && info->origSCpnt->device->id == SDpnt->id) info->origSCpnt = NULL; if (info->reqSCpnt && info->reqSCpnt->device->id == SDpnt->id) info->reqSCpnt = NULL; info->SCpnt = NULL; for (i = 0; i < 8; i++) clear_bit(SDpnt->id * 8 + i, info->busyluns); } info->scsi.phase = PHASE_IDLE; /* * Reset the SCSI bus. Device cleanup happens in * the interrupt handler. */ fas216_cmd(info, CMD_RESETSCSI); mod_timer(&info->eh_timer, jiffies + HZ); spin_unlock_irqrestore(&info->host_lock, flags); /* * Wait one second for the interrupt. */ wait_event(info->eh_wait, info->rst_bus_status); del_timer_sync(&info->eh_timer); fas216_log(info, LOG_ERROR, "bus reset complete: %s\n", info->rst_bus_status == 1 ? "success" : "failed"); return info->rst_bus_status == 1 ? SUCCESS : FAILED; } /** * fas216_init_chip - Initialise FAS216 state after reset * @info: state structure for interface * * Initialise FAS216 state after reset */ static void fas216_init_chip(FAS216_Info *info) { unsigned int clock = ((info->ifcfg.clockrate - 1) / 5 + 1) & 7; fas216_writeb(info, REG_CLKF, clock); fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); fas216_writeb(info, REG_CNTL2, info->scsi.cfg[1]); fas216_writeb(info, REG_CNTL3, info->scsi.cfg[2]); fas216_writeb(info, REG_STIM, info->ifcfg.select_timeout); fas216_writeb(info, REG_SOF, 0); fas216_writeb(info, REG_STP, info->scsi.async_stp); fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); } /** * fas216_eh_host_reset - Reset the host associated with this command * @SCpnt: command specifing host to reset * * Reset the host associated with this command. * Returns: FAILED if unable to reset. * Notes: io_request_lock is taken, and irqs are disabled */ int fas216_eh_host_reset(struct scsi_cmnd *SCpnt) { FAS216_Info *info = (FAS216_Info *)SCpnt->device->host->hostdata; spin_lock_irq(info->host->host_lock); fas216_checkmagic(info); fas216_log(info, LOG_ERROR, "resetting host"); /* * Reset the SCSI chip. */ fas216_cmd(info, CMD_RESETCHIP); /* * Ugly ugly ugly! * We need to release the host_lock and enable * IRQs if we sleep, but we must relock and disable * IRQs after the sleep. */ spin_unlock_irq(info->host->host_lock); msleep(50 * 1000/100); spin_lock_irq(info->host->host_lock); /* * Release the SCSI reset. */ fas216_cmd(info, CMD_NOP); fas216_init_chip(info); spin_unlock_irq(info->host->host_lock); return SUCCESS; } #define TYPE_UNKNOWN 0 #define TYPE_NCR53C90 1 #define TYPE_NCR53C90A 2 #define TYPE_NCR53C9x 3 #define TYPE_Am53CF94 4 #define TYPE_EmFAS216 5 #define TYPE_QLFAS216 6 static char *chip_types[] = { "unknown", "NS NCR53C90", "NS NCR53C90A", "NS NCR53C9x", "AMD Am53CF94", "Emulex FAS216", "QLogic FAS216" }; static int fas216_detect_type(FAS216_Info *info) { int family, rev; /* * Reset the chip. */ fas216_writeb(info, REG_CMD, CMD_RESETCHIP); udelay(50); fas216_writeb(info, REG_CMD, CMD_NOP); /* * Check to see if control reg 2 is present. */ fas216_writeb(info, REG_CNTL3, 0); fas216_writeb(info, REG_CNTL2, CNTL2_S2FE); /* * If we are unable to read back control reg 2 * correctly, it is not present, and we have a * NCR53C90. */ if ((fas216_readb(info, REG_CNTL2) & (~0xe0)) != CNTL2_S2FE) return TYPE_NCR53C90; /* * Now, check control register 3 */ fas216_writeb(info, REG_CNTL2, 0); fas216_writeb(info, REG_CNTL3, 0); fas216_writeb(info, REG_CNTL3, 5); /* * If we are unable to read the register back * correctly, we have a NCR53C90A */ if (fas216_readb(info, REG_CNTL3) != 5) return TYPE_NCR53C90A; /* * Now read the ID from the chip. */ fas216_writeb(info, REG_CNTL3, 0); fas216_writeb(info, REG_CNTL3, CNTL3_ADIDCHK); fas216_writeb(info, REG_CNTL3, 0); fas216_writeb(info, REG_CMD, CMD_RESETCHIP); udelay(50); fas216_writeb(info, REG_CMD, CMD_WITHDMA | CMD_NOP); fas216_writeb(info, REG_CNTL2, CNTL2_ENF); fas216_writeb(info, REG_CMD, CMD_RESETCHIP); udelay(50); fas216_writeb(info, REG_CMD, CMD_NOP); rev = fas216_readb(info, REG_ID); family = rev >> 3; rev &= 7; switch (family) { case 0x01: if (rev == 4) return TYPE_Am53CF94; break; case 0x02: switch (rev) { case 2: return TYPE_EmFAS216; case 3: return TYPE_QLFAS216; } break; default: break; } printk("family %x rev %x\n", family, rev); return TYPE_NCR53C9x; } /** * fas216_reset_state - Initialise driver internal state * @info: state to initialise * * Initialise driver internal state */ static void fas216_reset_state(FAS216_Info *info) { int i; fas216_checkmagic(info); fas216_bus_reset(info); /* * Clear out all stale info in our state structure */ memset(info->busyluns, 0, sizeof(info->busyluns)); info->scsi.disconnectable = 0; info->scsi.aborting = 0; for (i = 0; i < 8; i++) { info->device[i].parity_enabled = 0; info->device[i].parity_check = 1; } /* * Drain all commands on disconnected queue */ while (queue_remove(&info->queues.disconnected) != NULL); /* * Remove executing commands. */ info->SCpnt = NULL; info->reqSCpnt = NULL; info->rstSCpnt = NULL; info->origSCpnt = NULL; } /** * fas216_init - initialise FAS/NCR/AMD SCSI structures. * @host: a driver-specific filled-out structure * * Initialise FAS/NCR/AMD SCSI structures. * Returns: 0 on success */ int fas216_init(struct Scsi_Host *host) { FAS216_Info *info = (FAS216_Info *)host->hostdata; info->magic_start = MAGIC; info->magic_end = MAGIC; info->host = host; info->scsi.cfg[0] = host->this_id | CNTL1_PERE; info->scsi.cfg[1] = CNTL2_ENF | CNTL2_S2FE; info->scsi.cfg[2] = info->ifcfg.cntl3 | CNTL3_ADIDCHK | CNTL3_QTAG | CNTL3_G2CB | CNTL3_LBTM; info->scsi.async_stp = fas216_syncperiod(info, info->ifcfg.asyncperiod); info->rst_dev_status = -1; info->rst_bus_status = -1; init_waitqueue_head(&info->eh_wait); timer_setup(&info->eh_timer, fas216_eh_timer, 0); spin_lock_init(&info->host_lock); memset(&info->stats, 0, sizeof(info->stats)); msgqueue_initialise(&info->scsi.msgs); if (!queue_initialise(&info->queues.issue)) return -ENOMEM; if (!queue_initialise(&info->queues.disconnected)) { queue_free(&info->queues.issue); return -ENOMEM; } return 0; } /** * fas216_add - initialise FAS/NCR/AMD SCSI ic. * @host: a driver-specific filled-out structure * @dev: parent device * * Initialise FAS/NCR/AMD SCSI ic. * Returns: 0 on success */ int fas216_add(struct Scsi_Host *host, struct device *dev) { FAS216_Info *info = (FAS216_Info *)host->hostdata; int type, ret; if (info->ifcfg.clockrate <= 10 || info->ifcfg.clockrate > 40) { printk(KERN_CRIT "fas216: invalid clock rate %u MHz\n", info->ifcfg.clockrate); return -EINVAL; } fas216_reset_state(info); type = fas216_detect_type(info); info->scsi.type = chip_types[type]; udelay(300); /* * Initialise the chip correctly. */ fas216_init_chip(info); /* * Reset the SCSI bus. We don't want to see * the resulting reset interrupt, so mask it * out. */ fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0] | CNTL1_DISR); fas216_writeb(info, REG_CMD, CMD_RESETSCSI); /* * scsi standard says wait 250ms */ spin_unlock_irq(info->host->host_lock); msleep(100*1000/100); spin_lock_irq(info->host->host_lock); fas216_writeb(info, REG_CNTL1, info->scsi.cfg[0]); fas216_readb(info, REG_INST); fas216_checkmagic(info); ret = scsi_add_host(host, dev); if (ret) fas216_writeb(info, REG_CMD, CMD_RESETCHIP); else scsi_scan_host(host); return ret; } void fas216_remove(struct Scsi_Host *host) { FAS216_Info *info = (FAS216_Info *)host->hostdata; fas216_checkmagic(info); scsi_remove_host(host); fas216_writeb(info, REG_CMD, CMD_RESETCHIP); scsi_host_put(host); } /** * fas216_release - release all resources for FAS/NCR/AMD SCSI ic. * @host: a driver-specific filled-out structure * * release all resources and put everything to bed for FAS/NCR/AMD SCSI ic. */ void fas216_release(struct Scsi_Host *host) { FAS216_Info *info = (FAS216_Info *)host->hostdata; queue_free(&info->queues.disconnected); queue_free(&info->queues.issue); } void fas216_print_host(FAS216_Info *info, struct seq_file *m) { seq_printf(m, "\n" "Chip : %s\n" " Address: 0x%p\n" " IRQ : %d\n" " DMA : %d\n", info->scsi.type, info->scsi.io_base, info->scsi.irq, info->scsi.dma); } void fas216_print_stats(FAS216_Info *info, struct seq_file *m) { seq_printf(m, "\n" "Command Statistics:\n" " Queued : %u\n" " Issued : %u\n" " Completed : %u\n" " Reads : %u\n" " Writes : %u\n" " Others : %u\n" " Disconnects: %u\n" " Aborts : %u\n" " Bus resets : %u\n" " Host resets: %u\n", info->stats.queues, info->stats.removes, info->stats.fins, info->stats.reads, info->stats.writes, info->stats.miscs, info->stats.disconnects, info->stats.aborts, info->stats.bus_resets, info->stats.host_resets); } void fas216_print_devices(FAS216_Info *info, struct seq_file *m) { struct fas216_device *dev; struct scsi_device *scd; seq_puts(m, "Device/Lun TaggedQ Parity Sync\n"); shost_for_each_device(scd, info->host) { dev = &info->device[scd->id]; seq_printf(m, " %d/%llu ", scd->id, scd->lun); if (scd->tagged_supported) seq_printf(m, "%3sabled ", scd->simple_tags ? "en" : "dis"); else seq_puts(m, "unsupported "); seq_printf(m, "%3sabled ", dev->parity_enabled ? "en" : "dis"); if (dev->sof) seq_printf(m, "offset %d, %d ns\n", dev->sof, dev->period * 4); else seq_puts(m, "async\n"); } } EXPORT_SYMBOL(fas216_init); EXPORT_SYMBOL(fas216_add); EXPORT_SYMBOL(fas216_queue_command); EXPORT_SYMBOL(fas216_noqueue_command); EXPORT_SYMBOL(fas216_intr); EXPORT_SYMBOL(fas216_remove); EXPORT_SYMBOL(fas216_release); EXPORT_SYMBOL(fas216_eh_abort); EXPORT_SYMBOL(fas216_eh_device_reset); EXPORT_SYMBOL(fas216_eh_bus_reset); EXPORT_SYMBOL(fas216_eh_host_reset); EXPORT_SYMBOL(fas216_print_host); EXPORT_SYMBOL(fas216_print_stats); EXPORT_SYMBOL(fas216_print_devices); MODULE_AUTHOR("Russell King"); MODULE_DESCRIPTION("Generic FAS216/NCR53C9x driver core"); MODULE_LICENSE("GPL");
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