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Diffstat (limited to 'drivers/scsi/arm/fas216.c')
| -rw-r--r-- | drivers/scsi/arm/fas216.c | 3038 |
1 files changed, 3038 insertions, 0 deletions
diff --git a/drivers/scsi/arm/fas216.c b/drivers/scsi/arm/fas216.c new file mode 100644 index 000000000..4ce0b2d73 --- /dev/null +++ b/drivers/scsi/arm/fas216.c @@ -0,0 +1,3038 @@ +// 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"); |