mesh.c
上传用户:jlfgdled
上传日期:2013-04-10
资源大小:33168k
文件大小:52k
- /*
- * SCSI low-level driver for the MESH (Macintosh Enhanced SCSI Hardware)
- * bus adaptor found on Power Macintosh computers.
- * We assume the MESH is connected to a DBDMA (descriptor-based DMA)
- * controller.
- *
- * Paul Mackerras, August 1996.
- * Copyright (C) 1996 Paul Mackerras.
- *
- * Apr. 14 2002 - BenH Rework bus reset code for new error handler
- * Add delay after initial bus reset
- * Add module parameters
- * To do:
- * - handle aborts correctly
- * - retry arbitration if lost (unless higher levels do this for us)
- */
- #include <linux/config.h>
- #include <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/delay.h>
- #include <linux/types.h>
- #include <linux/string.h>
- #include <linux/slab.h>
- #include <linux/blk.h>
- #include <linux/proc_fs.h>
- #include <linux/stat.h>
- #include <linux/tqueue.h>
- #include <linux/interrupt.h>
- #include <linux/reboot.h>
- #include <linux/spinlock.h>
- #include <linux/pci.h>
- #include <asm/dbdma.h>
- #include <asm/io.h>
- #include <asm/pgtable.h>
- #include <asm/prom.h>
- #include <asm/system.h>
- #include <asm/irq.h>
- #include <asm/hydra.h>
- #include <asm/processor.h>
- #include <asm/machdep.h>
- #include <asm/pmac_feature.h>
- #include <asm/pci-bridge.h>
- #ifdef CONFIG_PMAC_PBOOK
- #include <linux/adb.h>
- #include <linux/pmu.h>
- #endif
- #include "scsi.h"
- #include "hosts.h"
- #include "mesh.h"
- #if 1
- #undef KERN_DEBUG
- #define KERN_DEBUG KERN_WARNING
- #endif
- MODULE_AUTHOR("Paul Mackerras (paulus@samba.org)");
- MODULE_DESCRIPTION("PowerMac MESH SCSI driver");
- MODULE_LICENSE("GPL");
- MODULE_PARM(sync_rate, "i");
- MODULE_PARM_DESC(sync_rate, "Synchronous rate (0..10, 0=async)");
- MODULE_PARM(sync_targets, "i");
- MODULE_PARM_DESC(sync_targets, "Bitmask of targets allowed to set synchronous");
- MODULE_PARM(resel_targets, "i");
- MODULE_PARM_DESC(resel_targets, "Bitmask of targets allowed to set disconnect");
- MODULE_PARM(debug_targets, "i");
- MODULE_PARM_DESC(debug_targets, "Bitmask of debugged targets");
- MODULE_PARM(init_reset_delay, "i");
- MODULE_PARM_DESC(init_reset_delay, "Initial bus reset delay (0=no reset)");
- static int sync_rate = CONFIG_SCSI_MESH_SYNC_RATE;
- static int sync_targets = 0xff;
- static int resel_targets = 0xff;
- static int debug_targets = 0; /* print debug for these targets */
- static int init_reset_delay = CONFIG_SCSI_MESH_RESET_DELAY_MS;
- static int mesh_sync_period = 100;
- static int mesh_sync_offset = 0;
- static unsigned char use_active_neg = 0; /* bit mask for SEQ_ACTIVE_NEG if used */
- #define ALLOW_SYNC(tgt) ((sync_targets >> (tgt)) & 1)
- #define ALLOW_RESEL(tgt) ((resel_targets >> (tgt)) & 1)
- #define ALLOW_DEBUG(tgt) ((debug_targets >> (tgt)) & 1)
- #define DEBUG_TARGET(cmd) ((cmd) && ALLOW_DEBUG((cmd)->target))
- #undef MESH_DBG
- #define N_DBG_LOG 50
- #define N_DBG_SLOG 20
- #define NUM_DBG_EVENTS 13
- #undef DBG_USE_TB /* bombs on 601 */
- struct dbglog {
- char *fmt;
- u32 tb;
- u8 phase;
- u8 bs0;
- u8 bs1;
- u8 tgt;
- int d;
- };
- enum mesh_phase {
- idle,
- arbitrating,
- selecting,
- commanding,
- dataing,
- statusing,
- busfreeing,
- disconnecting,
- reselecting,
- sleeping
- };
- enum msg_phase {
- msg_none,
- msg_out,
- msg_out_xxx,
- msg_out_last,
- msg_in,
- msg_in_bad,
- };
- enum sdtr_phase {
- do_sdtr,
- sdtr_sent,
- sdtr_done
- };
- struct mesh_target {
- enum sdtr_phase sdtr_state;
- int sync_params;
- int data_goes_out; /* guess as to data direction */
- Scsi_Cmnd *current_req;
- u32 saved_ptr;
- #ifdef MESH_DBG
- int log_ix;
- int n_log;
- struct dbglog log[N_DBG_LOG];
- #endif
- };
- struct mesh_state {
- volatile struct mesh_regs *mesh;
- int meshintr;
- volatile struct dbdma_regs *dma;
- int dmaintr;
- struct Scsi_Host *host;
- struct mesh_state *next;
- Scsi_Cmnd *request_q;
- Scsi_Cmnd *request_qtail;
- enum mesh_phase phase; /* what we're currently trying to do */
- enum msg_phase msgphase;
- int conn_tgt; /* target we're connected to */
- Scsi_Cmnd *current_req; /* req we're currently working on */
- int data_ptr;
- int dma_started;
- int dma_count;
- int stat;
- int aborting;
- int expect_reply;
- int n_msgin;
- u8 msgin[16];
- int n_msgout;
- int last_n_msgout;
- u8 msgout[16];
- struct dbdma_cmd *dma_cmds; /* space for dbdma commands, aligned */
- int clk_freq;
- struct mesh_target tgts[8];
- void *dma_cmd_space;
- struct device_node *ofnode;
- struct pci_dev* pdev;
- #ifdef MESH_DBG
- int log_ix;
- int n_log;
- struct dbglog log[N_DBG_SLOG];
- #endif
- };
- #ifdef MESH_DBG
- static void dlog(struct mesh_state *ms, char *fmt, int a);
- static void dumplog(struct mesh_state *ms, int tgt);
- static void dumpslog(struct mesh_state *ms);
- #else
- static inline void dlog(struct mesh_state *ms, char *fmt, int a)
- {}
- static inline void dumplog(struct mesh_state *ms, int tgt)
- {}
- static inline void dumpslog(struct mesh_state *ms)
- {}
- #endif /* MESH_DBG */
- #define MKWORD(a, b, c, d) (((a) << 24) + ((b) << 16) + ((c) << 8) + (d))
- static struct mesh_state *all_meshes;
- static void mesh_init(struct mesh_state *);
- static int mesh_notify_reboot(struct notifier_block *, unsigned long, void *);
- static void mesh_dump_regs(struct mesh_state *);
- static void mesh_start(struct mesh_state *);
- static void mesh_start_cmd(struct mesh_state *, Scsi_Cmnd *);
- static void add_sdtr_msg(struct mesh_state *);
- static void set_sdtr(struct mesh_state *, int, int);
- static void start_phase(struct mesh_state *);
- static void get_msgin(struct mesh_state *);
- static int msgin_length(struct mesh_state *);
- static void cmd_complete(struct mesh_state *);
- static void phase_mismatch(struct mesh_state *);
- static void reselected(struct mesh_state *);
- static void handle_reset(struct mesh_state *);
- static void handle_error(struct mesh_state *);
- static void handle_exception(struct mesh_state *);
- static void mesh_interrupt(int, void *, struct pt_regs *);
- static void do_mesh_interrupt(int, void *, struct pt_regs *);
- static void handle_msgin(struct mesh_state *);
- static void mesh_done(struct mesh_state *, int);
- static void mesh_completed(struct mesh_state *, Scsi_Cmnd *);
- static void set_dma_cmds(struct mesh_state *, Scsi_Cmnd *);
- static void halt_dma(struct mesh_state *);
- static int data_goes_out(Scsi_Cmnd *);
- static void do_abort(struct mesh_state *ms);
- static void set_mesh_power(struct mesh_state *ms, int state);
- #ifdef CONFIG_PMAC_PBOOK
- static int mesh_notify_sleep(struct pmu_sleep_notifier *self, int when);
- static struct pmu_sleep_notifier mesh_sleep_notifier = {
- mesh_notify_sleep,
- SLEEP_LEVEL_BLOCK,
- };
- #endif
- static struct notifier_block mesh_notifier = {
- mesh_notify_reboot,
- NULL,
- 0
- };
- int
- mesh_detect(Scsi_Host_Template *tp)
- {
- struct device_node *mesh;
- int nmeshes, tgt, *cfp, minper;
- struct mesh_state *ms, **prev_statep;
- struct Scsi_Host *mesh_host;
- void *dma_cmd_space;
- /* The SCSI layer is dumb ! It calls us with the IO request
- * lock held and interrupts disabled here... This doesn't happen
- * in 2.5
- */
- spin_unlock_irq(&io_request_lock);
-
- if (_machine == _MACH_Pmac) {
- use_active_neg = (find_devices("mac-io") ? 0 : SEQ_ACTIVE_NEG);
- } else {
- /* CHRP mac-io */
- use_active_neg = SEQ_ACTIVE_NEG;
- }
- /* Calculate sync rate from module parameters */
- if (sync_rate > 10)
- sync_rate = 10;
- if (sync_rate > 0) {
- printk(KERN_INFO "mesh: configured for synchronous %d MB/sn", sync_rate);
- mesh_sync_period = 1000 / sync_rate; /* ns */
- mesh_sync_offset = 15;
- } else
- printk(KERN_INFO "mesh: configured for asynchronousn");
- nmeshes = 0;
- prev_statep = &all_meshes;
- /*
- * On powermacs, the MESH node has device_type "mesh".
- * On chrp machines, its device_type is "scsi" with
- * "chrp,mesh0" as its `compatible' property.
- */
- mesh = find_devices("mesh");
- if (mesh == 0)
- mesh = find_compatible_devices("scsi", "chrp,mesh0");
- for (; mesh != 0; mesh = mesh->next) {
- u8 pci_bus, pci_devfn;
- struct pci_dev* pdev = NULL;
-
- if (mesh->n_addrs != 2 || mesh->n_intrs != 2) {
- printk(KERN_ERR "mesh: expected 2 addrs and 2 intrs"
- " (got %d,%d)n", mesh->n_addrs, mesh->n_intrs);
- continue;
- }
- if (mesh->parent != NULL
- && pci_device_from_OF_node(mesh->parent, &pci_bus,
- &pci_devfn) == 0)
- pdev = pci_find_slot(pci_bus, pci_devfn);
- if (pdev == NULL) {
- printk(KERN_ERR "mesh: Can't locate PCI entryn");
- continue;
- }
- mesh_host = scsi_register(tp, sizeof(struct mesh_state));
- if (mesh_host == 0) {
- printk(KERN_ERR "mesh: couldn't register host");
- continue;
- }
- mesh_host->unique_id = nmeshes;
- #if !defined(MODULE)
- note_scsi_host(mesh, mesh_host);
- #endif
- ms = (struct mesh_state *) mesh_host->hostdata;
- if (ms == 0)
- panic("no mesh state");
- memset(ms, 0, sizeof(*ms));
- ms->host = mesh_host;
- ms->ofnode = mesh;
- ms->pdev = pdev;
- ms->mesh = (volatile struct mesh_regs *)
- ioremap(mesh->addrs[0].address, 0x1000);
- ms->dma = (volatile struct dbdma_regs *)
- ioremap(mesh->addrs[1].address, 0x1000);
- ms->meshintr = mesh->intrs[0].line;
- ms->dmaintr = mesh->intrs[1].line;
- /* Space for dma command list: +1 for stop command,
- +1 to allow for aligning. */
- dma_cmd_space = kmalloc((mesh_host->sg_tablesize + 2) *
- sizeof(struct dbdma_cmd), GFP_KERNEL);
- if (dma_cmd_space == 0)
- panic("mesh: couldn't allocate dma command space");
- ms->dma_cmds = (struct dbdma_cmd *) DBDMA_ALIGN(dma_cmd_space);
- memset(ms->dma_cmds, 0, (mesh_host->sg_tablesize + 1)
- * sizeof(struct dbdma_cmd));
- ms->dma_cmd_space = dma_cmd_space;
- ms->current_req = 0;
- for (tgt = 0; tgt < 8; ++tgt) {
- ms->tgts[tgt].sdtr_state = do_sdtr;
- ms->tgts[tgt].sync_params = ASYNC_PARAMS;
- ms->tgts[tgt].current_req = 0;
- }
- *prev_statep = ms;
- prev_statep = &ms->next;
- if ((cfp = (int *) get_property(mesh, "clock-frequency",
- NULL))) {
- ms->clk_freq = *cfp;
- } else {
- printk(KERN_INFO "mesh: assuming 50MHz clock frequencyn");
- ms->clk_freq = 50000000;
- }
- /* The maximum sync rate is clock / 5; increase
- mesh_sync_period if necessary. */
- minper = 1000000000 / (ms->clk_freq / 5); /* ns */
- if (mesh_sync_period < minper)
- mesh_sync_period = minper;
- set_mesh_power(ms, 1);
- mesh_init(ms);
- if (request_irq(ms->meshintr, do_mesh_interrupt, 0, "MESH", ms)) {
- printk(KERN_ERR "MESH: can't get irq %dn", ms->meshintr);
- }
- ++nmeshes;
- }
- if ((_machine == _MACH_Pmac) && (nmeshes > 0)) {
- #ifdef CONFIG_PMAC_PBOOK
- pmu_register_sleep_notifier(&mesh_sleep_notifier);
- #endif /* CONFIG_PMAC_PBOOK */
- register_reboot_notifier(&mesh_notifier);
- }
- /* Return to the SCSI layer in the same state we got called */
- spin_lock_irq(&io_request_lock);
- return nmeshes;
- }
- int
- mesh_release(struct Scsi_Host *host)
- {
- struct mesh_state *ms = (struct mesh_state *) host->hostdata;
- if (ms == 0)
- return 0;
- if (ms->mesh)
- iounmap((void *) ms->mesh);
- if (ms->dma)
- iounmap((void *) ms->dma);
- kfree(ms->dma_cmd_space);
- free_irq(ms->meshintr, ms);
- pmac_call_feature(PMAC_FTR_MESH_ENABLE, ms->ofnode, 0, 0);
- return 0;
- }
- static void
- set_mesh_power(struct mesh_state *ms, int state)
- {
- if (_machine != _MACH_Pmac)
- return;
- if (state) {
- pmac_call_feature(PMAC_FTR_MESH_ENABLE, ms->ofnode, 0, 1);
- mdelay(200);
- } else {
- pmac_call_feature(PMAC_FTR_MESH_ENABLE, ms->ofnode, 0, 0);
- mdelay(10);
- }
- }
- #ifdef CONFIG_PMAC_PBOOK
- /*
- * notify clients before sleep and reset bus afterwards
- */
- int
- mesh_notify_sleep(struct pmu_sleep_notifier *self, int when)
- {
- struct mesh_state *ms;
-
- switch (when) {
- case PBOOK_SLEEP_REQUEST:
- /* XXX We should wait for current transactions and queue
- * new ones that would be posted beyond this point
- */
- break;
- case PBOOK_SLEEP_REJECT:
- break;
-
- case PBOOK_SLEEP_NOW:
- for (ms = all_meshes; ms != 0; ms = ms->next) {
- unsigned long flags;
- scsi_block_requests(ms->host);
- spin_lock_irqsave(&io_request_lock, flags);
- while(ms->phase != idle) {
- spin_unlock_irqrestore(&io_request_lock, flags);
- current->state = TASK_UNINTERRUPTIBLE;
- schedule_timeout(1);
- spin_lock_irqsave(&io_request_lock, flags);
- }
- ms->phase = sleeping;
- spin_unlock_irqrestore(&io_request_lock, flags);
- disable_irq(ms->meshintr);
- set_mesh_power(ms, 0);
- }
- break;
- case PBOOK_WAKE:
- for (ms = all_meshes; ms != 0; ms = ms->next) {
- unsigned long flags;
-
- set_mesh_power(ms, 1);
- mesh_init(ms);
- spin_lock_irqsave(&io_request_lock, flags);
- mesh_start(ms);
- spin_unlock_irqrestore(&io_request_lock, flags);
- enable_irq(ms->meshintr);
- scsi_unblock_requests(ms->host);
- }
- break;
- }
- return PBOOK_SLEEP_OK;
- }
- #endif /* CONFIG_PMAC_PBOOK */
- /*
- * Called by midlayer with host locked to queue a new
- * request
- */
- int
- mesh_queue(Scsi_Cmnd *cmd, void (*done)(Scsi_Cmnd *))
- {
- struct mesh_state *ms;
- cmd->scsi_done = done;
- cmd->host_scribble = NULL;
- ms = (struct mesh_state *) cmd->host->hostdata;
- if (ms->request_q == NULL)
- ms->request_q = cmd;
- else
- ms->request_qtail->host_scribble = (void *) cmd;
- ms->request_qtail = cmd;
- if (ms->phase == idle)
- mesh_start(ms);
- return 0;
- }
- /* Todo: here we can at least try to remove the command from the
- * queue if it isn't connected yet, and for pending command, assert
- * ATN until the bus gets freed.
- */
- int
- mesh_abort(Scsi_Cmnd *cmd)
- {
- struct mesh_state *ms = (struct mesh_state *) cmd->host->hostdata;
- printk(KERN_DEBUG "mesh_abort(%p)n", cmd);
- mesh_dump_regs(ms);
- dumplog(ms, cmd->target);
- dumpslog(ms);
- return SCSI_ABORT_SNOOZE;
- }
- static void
- mesh_dump_regs(struct mesh_state *ms)
- {
- volatile struct mesh_regs *mr = ms->mesh;
- volatile struct dbdma_regs *md = ms->dma;
- int t;
- struct mesh_target *tp;
- printk(KERN_DEBUG "mesh: state at %p, regs at %p, dma at %pn",
- ms, mr, md);
- printk(KERN_DEBUG " ct=%4x seq=%2x bs=%4x fc=%2x "
- "exc=%2x err=%2x im=%2x int=%2x sp=%2xn",
- (mr->count_hi << 8) + mr->count_lo, mr->sequence,
- (mr->bus_status1 << 8) + mr->bus_status0, mr->fifo_count,
- mr->exception, mr->error, mr->intr_mask, mr->interrupt,
- mr->sync_params);
- while(in_8(&mr->fifo_count))
- printk(KERN_DEBUG " fifo data=%.2xn",in_8(&mr->fifo));
- printk(KERN_DEBUG " dma stat=%x cmdptr=%xn",
- in_le32(&md->status), in_le32(&md->cmdptr));
- printk(KERN_DEBUG " phase=%d msgphase=%d conn_tgt=%d data_ptr=%dn",
- ms->phase, ms->msgphase, ms->conn_tgt, ms->data_ptr);
- printk(KERN_DEBUG " dma_st=%d dma_ct=%d n_msgout=%dn",
- ms->dma_started, ms->dma_count, ms->n_msgout);
- for (t = 0; t < 8; ++t) {
- tp = &ms->tgts[t];
- if (tp->current_req == NULL)
- continue;
- printk(KERN_DEBUG " target %d: req=%p goes_out=%d saved_ptr=%dn",
- t, tp->current_req, tp->data_goes_out, tp->saved_ptr);
- }
- }
- /*
- * Called by the midlayer with the lock held to reset the
- * SCSI host and bus.
- * The midlayer will wait for devices to come back, we don't need
- * to do that ourselves
- */
- int
- mesh_host_reset(Scsi_Cmnd *cmd)
- {
- struct mesh_state *ms = (struct mesh_state *) cmd->host->hostdata;
- volatile struct mesh_regs *mr = ms->mesh;
- volatile struct dbdma_regs *md = ms->dma;
- printk(KERN_DEBUG "mesh_host_resetn");
- /* Reset the controller & dbdma channel */
- out_le32(&md->control, (RUN|PAUSE|FLUSH|WAKE) << 16); /* stop dma */
- out_8(&mr->exception, 0xff); /* clear all exception bits */
- out_8(&mr->error, 0xff); /* clear all error bits */
- out_8(&mr->sequence, SEQ_RESETMESH);
- udelay(1);
- out_8(&mr->intr_mask, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
- out_8(&mr->source_id, ms->host->this_id);
- out_8(&mr->sel_timeout, 25); /* 250ms */
- out_8(&mr->sync_params, ASYNC_PARAMS);
- /* Reset the bus */
- out_8(&mr->bus_status1, BS1_RST); /* assert RST */
- udelay(30); /* leave it on for >= 25us */
- out_8(&mr->bus_status1, 0); /* negate RST */
- /* Complete pending commands */
- handle_reset(ms);
-
- return SUCCESS;
- }
- /*
- * If we leave drives set for synchronous transfers (especially
- * CDROMs), and reboot to MacOS, it gets confused, poor thing.
- * So, on reboot we reset the SCSI bus.
- */
- static int
- mesh_notify_reboot(struct notifier_block *this, unsigned long code, void *x)
- {
- struct mesh_state *ms;
- volatile struct mesh_regs *mr;
- if (code == SYS_DOWN) {
- printk(KERN_INFO "resetting MESH scsi bus(es)n");
- for (ms = all_meshes; ms != 0; ms = ms->next) {
- mr = ms->mesh;
- out_8(&mr->intr_mask, 0);
- out_8(&mr->interrupt,
- INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
- out_8(&mr->bus_status1, BS1_RST);
- udelay(30);
- out_8(&mr->bus_status1, 0);
- }
- }
- return NOTIFY_DONE;
- }
- /* Called with meshinterrupt disabled, initialize the chipset
- * and eventually do the initial bus reset. The lock must not be
- * held since we can schedule.
- */
- static void
- mesh_init(struct mesh_state *ms)
- {
- volatile struct mesh_regs *mr = ms->mesh;
- volatile struct dbdma_regs *md = ms->dma;
- udelay(100);
- /* Reset controller */
- out_le32(&md->control, (RUN|PAUSE|FLUSH|WAKE) << 16); /* stop dma */
- out_8(&mr->exception, 0xff); /* clear all exception bits */
- out_8(&mr->error, 0xff); /* clear all error bits */
- out_8(&mr->sequence, SEQ_RESETMESH);
- udelay(10);
- out_8(&mr->intr_mask, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
- out_8(&mr->source_id, ms->host->this_id);
- out_8(&mr->sel_timeout, 25); /* 250ms */
- out_8(&mr->sync_params, ASYNC_PARAMS);
- if (init_reset_delay) {
- printk(KERN_INFO "mesh: performing initial bus reset...n");
-
- /* Reset bus */
- out_8(&mr->bus_status1, BS1_RST); /* assert RST */
- udelay(30); /* leave it on for >= 25us */
- out_8(&mr->bus_status1, 0); /* negate RST */
- /* Wait for bus to come back */
- current->state = TASK_UNINTERRUPTIBLE;
- schedule_timeout((init_reset_delay * HZ) / 1000);
- }
-
- /* Reconfigure controller */
- out_8(&mr->interrupt, 0xff); /* clear all interrupt bits */
- out_8(&mr->sequence, SEQ_FLUSHFIFO);
- udelay(1);
- out_8(&mr->sync_params, ASYNC_PARAMS);
- out_8(&mr->sequence, SEQ_ENBRESEL);
- ms->phase = idle;
- ms->msgphase = msg_none;
- }
- /*
- * Start the next command for a MESH.
- * Should be called with interrupts disabled.
- */
- static void
- mesh_start(struct mesh_state *ms)
- {
- Scsi_Cmnd *cmd, *prev, *next;
- if (ms->phase != idle || ms->current_req != NULL) {
- printk(KERN_ERR "inappropriate mesh_start (phase=%d, ms=%p)",
- ms->phase, ms);
- return;
- }
- while (ms->phase == idle) {
- prev = NULL;
- for (cmd = ms->request_q; ; cmd = (Scsi_Cmnd *) cmd->host_scribble) {
- if (cmd == NULL)
- return;
- if (ms->tgts[cmd->target].current_req == NULL)
- break;
- prev = cmd;
- }
- next = (Scsi_Cmnd *) cmd->host_scribble;
- if (prev == NULL)
- ms->request_q = next;
- else
- prev->host_scribble = (void *) next;
- if (next == NULL)
- ms->request_qtail = prev;
- mesh_start_cmd(ms, cmd);
- }
- }
- static void
- mesh_start_cmd(struct mesh_state *ms, Scsi_Cmnd *cmd)
- {
- volatile struct mesh_regs *mr = ms->mesh;
- int t;
- ms->current_req = cmd;
- ms->tgts[cmd->target].data_goes_out = data_goes_out(cmd);
- ms->tgts[cmd->target].current_req = cmd;
- #if 1
- if (DEBUG_TARGET(cmd)) {
- int i;
- printk(KERN_DEBUG "mesh_start: %p ser=%lu tgt=%d cmd=",
- cmd, cmd->serial_number, cmd->target);
- for (i = 0; i < cmd->cmd_len; ++i)
- printk(" %x", cmd->cmnd[i]);
- printk(" use_sg=%d buffer=%p bufflen=%un",
- cmd->use_sg, cmd->request_buffer, cmd->request_bufflen);
- }
- #endif
- if (ms->dma_started)
- panic("mesh: double DMA start !n");
- ms->phase = arbitrating;
- ms->msgphase = msg_none;
- ms->data_ptr = 0;
- ms->dma_started = 0;
- ms->n_msgout = 0;
- ms->last_n_msgout = 0;
- ms->expect_reply = 0;
- ms->conn_tgt = cmd->target;
- ms->tgts[cmd->target].saved_ptr = 0;
- ms->stat = DID_OK;
- ms->aborting = 0;
- #ifdef MESH_DBG
- ms->tgts[cmd->target].n_log = 0;
- dlog(ms, "start cmd=%x", (int) cmd);
- #endif
- /* Off we go */
- dlog(ms, "about to arb, intr/exc/err/fc=%.8x",
- MKWORD(mr->interrupt, mr->exception, mr->error, mr->fifo_count));
- out_8(&mr->interrupt, INT_CMDDONE);
- out_8(&mr->sequence, SEQ_ENBRESEL);
- udelay(1);
- if (mr->bus_status1 & (BS1_BSY | BS1_SEL)) {
- /*
- * Some other device has the bus or is arbitrating for it -
- * probably a target which is about to reselect us.
- */
- dlog(ms, "busy b4 arb, intr/exc/err/fc=%.8x",
- MKWORD(mr->interrupt, mr->exception,
- mr->error, mr->fifo_count));
- for (t = 100; t > 0; --t) {
- if ((mr->bus_status1 & (BS1_BSY | BS1_SEL)) == 0)
- break;
- if (in_8(&mr->interrupt) != 0) {
- dlog(ms, "intr b4 arb, intr/exc/err/fc=%.8x",
- MKWORD(mr->interrupt, mr->exception,
- mr->error, mr->fifo_count));
- mesh_interrupt(0, (void *)ms, 0);
- if (ms->phase != arbitrating)
- return;
- }
- udelay(1);
- }
- if (mr->bus_status1 & (BS1_BSY | BS1_SEL)) {
- /* XXX should try again in a little while */
- ms->stat = DID_BUS_BUSY;
- ms->phase = idle;
- mesh_done(ms, 0);
- return;
- }
- }
- /*
- * Apparently the mesh has a bug where it will assert both its
- * own bit and the target's bit on the bus during arbitration.
- */
- out_8(&mr->dest_id, mr->source_id);
- /*
- * There appears to be a race with reselection sometimes,
- * where a target reselects us just as we issue the
- * arbitrate command. It seems that then the arbitrate
- * command just hangs waiting for the bus to be free
- * without giving us a reselection exception.
- * The only way I have found to get it to respond correctly
- * is this: disable reselection before issuing the arbitrate
- * command, then after issuing it, if it looks like a target
- * is trying to reselect us, reset the mesh and then enable
- * reselection.
- */
- out_8(&mr->sequence, SEQ_DISRESEL);
- if (in_8(&mr->interrupt) != 0) {
- dlog(ms, "intr after disresel, intr/exc/err/fc=%.8x",
- MKWORD(mr->interrupt, mr->exception,
- mr->error, mr->fifo_count));
- mesh_interrupt(0, (void *)ms, 0);
- if (ms->phase != arbitrating)
- return;
- dlog(ms, "after intr after disresel, intr/exc/err/fc=%.8x",
- MKWORD(mr->interrupt, mr->exception,
- mr->error, mr->fifo_count));
- }
- out_8(&mr->sequence, SEQ_ARBITRATE);
- for (t = 230; t > 0; --t) {
- if (in_8(&mr->interrupt) != 0)
- break;
- udelay(1);
- }
- dlog(ms, "after arb, intr/exc/err/fc=%.8x",
- MKWORD(mr->interrupt, mr->exception, mr->error, mr->fifo_count));
- if (mr->interrupt == 0 && (mr->bus_status1 & BS1_SEL)
- && (mr->bus_status0 & BS0_IO)) {
- /* looks like a reselection - try resetting the mesh */
- dlog(ms, "resel? after arb, intr/exc/err/fc=%.8x",
- MKWORD(mr->interrupt, mr->exception, mr->error, mr->fifo_count));
- out_8(&mr->sequence, SEQ_RESETMESH);
- udelay(10);
- out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
- out_8(&mr->intr_mask, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
- out_8(&mr->sequence, SEQ_ENBRESEL);
- for (t = 10; t > 0 && mr->interrupt == 0; --t)
- udelay(1);
- dlog(ms, "tried reset after arb, intr/exc/err/fc=%.8x",
- MKWORD(mr->interrupt, mr->exception, mr->error, mr->fifo_count));
- #ifndef MESH_MULTIPLE_HOSTS
- if (mr->interrupt == 0 && (mr->bus_status1 & BS1_SEL)
- && (mr->bus_status0 & BS0_IO)) {
- printk(KERN_ERR "mesh: controller not responding"
- " to reselection!n");
- /*
- * If this is a target reselecting us, and the
- * mesh isn't responding, the higher levels of
- * the scsi code will eventually time out and
- * reset the bus.
- */
- }
- #endif
- }
- }
- static inline void
- add_sdtr_msg(struct mesh_state *ms)
- {
- int i = ms->n_msgout;
- ms->msgout[i] = EXTENDED_MESSAGE;
- ms->msgout[i+1] = 3;
- ms->msgout[i+2] = EXTENDED_SDTR;
- ms->msgout[i+3] = mesh_sync_period/4;
- ms->msgout[i+4] = (ALLOW_SYNC(ms->conn_tgt)? mesh_sync_offset: 0);
- ms->n_msgout = i + 5;
- }
- static void
- set_sdtr(struct mesh_state *ms, int period, int offset)
- {
- struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
- volatile struct mesh_regs *mr = ms->mesh;
- int v, tr;
- tp->sdtr_state = sdtr_done;
- if (offset == 0) {
- /* asynchronous */
- if (SYNC_OFF(tp->sync_params))
- printk(KERN_INFO "mesh: target %d now asynchronousn",
- ms->conn_tgt);
- tp->sync_params = ASYNC_PARAMS;
- out_8(&mr->sync_params, ASYNC_PARAMS);
- return;
- }
- /*
- * We need to compute ceil(clk_freq * period / 500e6) - 2
- * without incurring overflow.
- */
- v = (ms->clk_freq / 5000) * period;
- if (v <= 250000) {
- /* special case: sync_period == 5 * clk_period */
- v = 0;
- /* units of tr are 100kB/s */
- tr = (ms->clk_freq + 250000) / 500000;
- } else {
- /* sync_period == (v + 2) * 2 * clk_period */
- v = (v + 99999) / 100000 - 2;
- if (v > 15)
- v = 15; /* oops */
- tr = ((ms->clk_freq / (v + 2)) + 199999) / 200000;
- }
- if (offset > 15)
- offset = 15; /* can't happen */
- tp->sync_params = SYNC_PARAMS(offset, v);
- out_8(&mr->sync_params, tp->sync_params);
- printk(KERN_INFO "mesh: target %d synchronous at %d.%d MB/sn",
- ms->conn_tgt, tr/10, tr%10);
- }
- static void
- start_phase(struct mesh_state *ms)
- {
- int i, seq, nb;
- volatile struct mesh_regs *mr = ms->mesh;
- volatile struct dbdma_regs *md = ms->dma;
- Scsi_Cmnd *cmd = ms->current_req;
- struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
- dlog(ms, "start_phase nmo/exc/fc/seq = %.8x",
- MKWORD(ms->n_msgout, mr->exception, mr->fifo_count, mr->sequence));
- out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
- seq = use_active_neg + (ms->n_msgout? SEQ_ATN: 0);
- switch (ms->msgphase) {
- case msg_none:
- break;
- case msg_in:
- out_8(&mr->count_hi, 0);
- out_8(&mr->count_lo, 1);
- out_8(&mr->sequence, SEQ_MSGIN + seq);
- ms->n_msgin = 0;
- return;
- case msg_out:
- /*
- * To make sure ATN drops before we assert ACK for
- * the last byte of the message, we have to do the
- * last byte specially.
- */
- if (ms->n_msgout <= 0) {
- printk(KERN_ERR "mesh: msg_out but n_msgout=%dn",
- ms->n_msgout);
- mesh_dump_regs(ms);
- ms->msgphase = msg_none;
- break;
- }
- if (ALLOW_DEBUG(ms->conn_tgt)) {
- printk(KERN_DEBUG "mesh: sending %d msg bytes:",
- ms->n_msgout);
- for (i = 0; i < ms->n_msgout; ++i)
- printk(" %x", ms->msgout[i]);
- printk("n");
- }
- dlog(ms, "msgout msg=%.8x", MKWORD(ms->n_msgout, ms->msgout[0],
- ms->msgout[1], ms->msgout[2]));
- out_8(&mr->count_hi, 0);
- out_8(&mr->sequence, SEQ_FLUSHFIFO);
- udelay(1);
- /*
- * If ATN is not already asserted, we assert it, then
- * issue a SEQ_MSGOUT to get the mesh to drop ACK.
- */
- if ((mr->bus_status0 & BS0_ATN) == 0) {
- dlog(ms, "bus0 was %.2x explictly asserting ATN", mr->bus_status0);
- out_8(&mr->bus_status0, BS0_ATN); /* explicit ATN */
- udelay(1);
- out_8(&mr->count_lo, 1);
- out_8(&mr->sequence, SEQ_MSGOUT + seq);
- out_8(&mr->bus_status0, 0); /* release explicit ATN */
- dlog(ms,"hace: after explicit ATN bus0=%.2x",mr->bus_status0);
- }
- if (ms->n_msgout == 1) {
- /*
- * We can't issue the SEQ_MSGOUT without ATN
- * until the target has asserted REQ. The logic
- * in cmd_complete handles both situations:
- * REQ already asserted or not.
- */
- cmd_complete(ms);
- } else {
- out_8(&mr->count_lo, ms->n_msgout - 1);
- out_8(&mr->sequence, SEQ_MSGOUT + seq);
- for (i = 0; i < ms->n_msgout - 1; ++i)
- out_8(&mr->fifo, ms->msgout[i]);
- }
- return;
- default:
- printk(KERN_ERR "mesh bug: start_phase msgphase=%dn",
- ms->msgphase);
- }
- switch (ms->phase) {
- case selecting:
- out_8(&mr->dest_id, ms->conn_tgt);
- out_8(&mr->sequence, SEQ_SELECT + SEQ_ATN);
- break;
- case commanding:
- out_8(&mr->sync_params, tp->sync_params);
- out_8(&mr->count_hi, 0);
- if (cmd) {
- out_8(&mr->count_lo, cmd->cmd_len);
- out_8(&mr->sequence, SEQ_COMMAND + seq);
- for (i = 0; i < cmd->cmd_len; ++i)
- out_8(&mr->fifo, cmd->cmnd[i]);
- } else {
- out_8(&mr->count_lo, 6);
- out_8(&mr->sequence, SEQ_COMMAND + seq);
- for (i = 0; i < 6; ++i)
- out_8(&mr->fifo, 0);
- }
- break;
- case dataing:
- /* transfer data, if any */
- if (!ms->dma_started) {
- set_dma_cmds(ms, cmd);
- out_le32(&md->cmdptr, virt_to_phys(ms->dma_cmds));
- out_le32(&md->control, (RUN << 16) | RUN);
- ms->dma_started = 1;
- }
- nb = ms->dma_count;
- if (nb > 0xfff0)
- nb = 0xfff0;
- ms->dma_count -= nb;
- ms->data_ptr += nb;
- out_8(&mr->count_lo, nb);
- out_8(&mr->count_hi, nb >> 8);
- out_8(&mr->sequence, (tp->data_goes_out?
- SEQ_DATAOUT: SEQ_DATAIN) + SEQ_DMA_MODE + seq);
- break;
- case statusing:
- out_8(&mr->count_hi, 0);
- out_8(&mr->count_lo, 1);
- out_8(&mr->sequence, SEQ_STATUS + seq);
- break;
- case busfreeing:
- case disconnecting:
- out_8(&mr->sequence, SEQ_ENBRESEL);
- udelay(1);
- dlog(ms, "enbresel intr/exc/err/fc=%.8x",
- MKWORD(mr->interrupt, mr->exception, mr->error,
- mr->fifo_count));
- out_8(&mr->sequence, SEQ_BUSFREE);
- break;
- default:
- printk(KERN_ERR "mesh: start_phase called with phase=%dn",
- ms->phase);
- dumpslog(ms);
- }
- }
- static inline void
- get_msgin(struct mesh_state *ms)
- {
- volatile struct mesh_regs *mr = ms->mesh;
- int i, n;
- n = mr->fifo_count;
- if (n != 0) {
- i = ms->n_msgin;
- ms->n_msgin = i + n;
- for (; n > 0; --n)
- ms->msgin[i++] = in_8(&mr->fifo);
- }
- }
- static inline int
- msgin_length(struct mesh_state *ms)
- {
- int b, n;
- n = 1;
- if (ms->n_msgin > 0) {
- b = ms->msgin[0];
- if (b == 1) {
- /* extended message */
- n = ms->n_msgin < 2? 2: ms->msgin[1] + 2;
- } else if (0x20 <= b && b <= 0x2f) {
- /* 2-byte message */
- n = 2;
- }
- }
- return n;
- }
- static void
- cmd_complete(struct mesh_state *ms)
- {
- volatile struct mesh_regs *mr = ms->mesh;
- Scsi_Cmnd *cmd = ms->current_req;
- struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
- int seq, n, t;
- dlog(ms, "cmd_complete fc=%x", mr->fifo_count);
- seq = use_active_neg + (ms->n_msgout? SEQ_ATN: 0);
- switch (ms->msgphase) {
- case msg_out_xxx:
- /* huh? we expected a phase mismatch */
- ms->n_msgin = 0;
- ms->msgphase = msg_in;
- /* fall through */
- case msg_in:
- /* should have some message bytes in fifo */
- get_msgin(ms);
- n = msgin_length(ms);
- if (ms->n_msgin < n) {
- out_8(&mr->count_lo, n - ms->n_msgin);
- out_8(&mr->sequence, SEQ_MSGIN + seq);
- } else {
- ms->msgphase = msg_none;
- handle_msgin(ms);
- start_phase(ms);
- }
- break;
- case msg_in_bad:
- out_8(&mr->sequence, SEQ_FLUSHFIFO);
- udelay(1);
- out_8(&mr->count_lo, 1);
- out_8(&mr->sequence, SEQ_MSGIN + SEQ_ATN + use_active_neg);
- break;
- case msg_out:
- /*
- * To get the right timing on ATN wrt ACK, we have
- * to get the MESH to drop ACK, wait until REQ gets
- * asserted, then drop ATN. To do this we first
- * issue a SEQ_MSGOUT with ATN and wait for REQ,
- * then change the command to a SEQ_MSGOUT w/o ATN.
- * If we don't see REQ in a reasonable time, we
- * change the command to SEQ_MSGIN with ATN,
- * wait for the phase mismatch interrupt, then
- * issue the SEQ_MSGOUT without ATN.
- */
- out_8(&mr->count_lo, 1);
- out_8(&mr->sequence, SEQ_MSGOUT + use_active_neg + SEQ_ATN);
- t = 30; /* wait up to 30us */
- while ((mr->bus_status0 & BS0_REQ) == 0 && --t >= 0)
- udelay(1);
- dlog(ms, "last_mbyte err/exc/fc/cl=%.8x",
- MKWORD(mr->error, mr->exception,
- mr->fifo_count, mr->count_lo));
- if (in_8(&mr->interrupt) & (INT_ERROR | INT_EXCEPTION)) {
- /* whoops, target didn't do what we expected */
- ms->last_n_msgout = ms->n_msgout;
- ms->n_msgout = 0;
- if (in_8(&mr->interrupt) & INT_ERROR) {
- printk(KERN_ERR "mesh: error %x in msg_outn",
- in_8(&mr->error));
- handle_error(ms);
- return;
- }
- if (in_8(&mr->exception) != EXC_PHASEMM)
- printk(KERN_ERR "mesh: exc %x in msg_outn",
- in_8(&mr->exception));
- else
- printk(KERN_DEBUG "mesh: bs0=%x in msg_outn",
- in_8(&mr->bus_status0));
- handle_exception(ms);
- return;
- }
- if (mr->bus_status0 & BS0_REQ) {
- out_8(&mr->sequence, SEQ_MSGOUT + use_active_neg);
- udelay(1);
- out_8(&mr->fifo, ms->msgout[ms->n_msgout-1]);
- ms->msgphase = msg_out_last;
- } else {
- out_8(&mr->sequence, SEQ_MSGIN + use_active_neg + SEQ_ATN);
- ms->msgphase = msg_out_xxx;
- }
- break;
- case msg_out_last:
- ms->last_n_msgout = ms->n_msgout;
- ms->n_msgout = 0;
- ms->msgphase = ms->expect_reply? msg_in: msg_none;
- start_phase(ms);
- break;
- case msg_none:
- switch (ms->phase) {
- case idle:
- printk(KERN_ERR "mesh: interrupt in idle phase?n");
- dumpslog(ms);
- return;
- case selecting:
- dlog(ms, "Selecting phase at command completion",0);
- ms->msgout[0] = IDENTIFY(ALLOW_RESEL(ms->conn_tgt),
- (cmd? cmd->lun: 0));
- ms->n_msgout = 1;
- ms->expect_reply = 0;
- if (ms->aborting) {
- ms->msgout[0] = ABORT;
- ms->n_msgout++;
- } else if (tp->sdtr_state == do_sdtr) {
- /* add SDTR message */
- add_sdtr_msg(ms);
- ms->expect_reply = 1;
- tp->sdtr_state = sdtr_sent;
- }
- ms->msgphase = msg_out;
- /*
- * We need to wait for REQ before dropping ATN.
- * We wait for at most 30us, then fall back to
- * a scheme where we issue a SEQ_COMMAND with ATN,
- * which will give us a phase mismatch interrupt
- * when REQ does come, and then we send the message.
- */
- t = 230; /* wait up to 230us */
- while ((mr->bus_status0 & BS0_REQ) == 0) {
- if (--t < 0) {
- dlog(ms, "impatient for req", ms->n_msgout);
- ms->msgphase = msg_none;
- break;
- }
- udelay(1);
- }
- break;
- case dataing:
- if (ms->dma_count != 0) {
- start_phase(ms);
- return;
- }
- /*
- * We can get a phase mismatch here if the target
- * changes to the status phase, even though we have
- * had a command complete interrupt. Then, if we
- * issue the SEQ_STATUS command, we'll get a sequence
- * error interrupt. Which isn't so bad except that
- * occasionally the mesh actually executes the
- * SEQ_STATUS *as well as* giving us the sequence
- * error and phase mismatch exception.
- */
- out_8(&mr->sequence, 0);
- out_8(&mr->interrupt,
- INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
- halt_dma(ms);
- break;
- case statusing:
- if (cmd) {
- cmd->SCp.Status = mr->fifo;
- if (DEBUG_TARGET(cmd))
- printk(KERN_DEBUG "mesh: status is %xn",
- cmd->SCp.Status);
- }
- ms->msgphase = msg_in;
- break;
- case busfreeing:
- mesh_done(ms, 1);
- return;
- case disconnecting:
- ms->current_req = 0;
- ms->phase = idle;
- mesh_start(ms);
- return;
- default:
- break;
- }
- ++ms->phase;
- start_phase(ms);
- break;
- }
- }
- static void phase_mismatch(struct mesh_state *ms)
- {
- volatile struct mesh_regs *mr = ms->mesh;
- int phase;
- dlog(ms, "phasemm ch/cl/seq/fc=%.8x",
- MKWORD(mr->count_hi, mr->count_lo, mr->sequence, mr->fifo_count));
- phase = mr->bus_status0 & BS0_PHASE;
- if (ms->msgphase == msg_out_xxx && phase == BP_MSGOUT) {
- /* output the last byte of the message, without ATN */
- out_8(&mr->count_lo, 1);
- out_8(&mr->sequence, SEQ_MSGOUT + use_active_neg);
- udelay(1);
- out_8(&mr->fifo, ms->msgout[ms->n_msgout-1]);
- ms->msgphase = msg_out_last;
- return;
- }
- if (ms->msgphase == msg_in) {
- get_msgin(ms);
- if (ms->n_msgin)
- handle_msgin(ms);
- }
- if (ms->dma_started)
- halt_dma(ms);
- if (mr->fifo_count) {
- out_8(&mr->sequence, SEQ_FLUSHFIFO);
- udelay(1);
- }
- ms->msgphase = msg_none;
- switch (phase) {
- case BP_DATAIN:
- ms->tgts[ms->conn_tgt].data_goes_out = 0;
- ms->phase = dataing;
- break;
- case BP_DATAOUT:
- ms->tgts[ms->conn_tgt].data_goes_out = 1;
- ms->phase = dataing;
- break;
- case BP_COMMAND:
- ms->phase = commanding;
- break;
- case BP_STATUS:
- ms->phase = statusing;
- break;
- case BP_MSGIN:
- ms->msgphase = msg_in;
- ms->n_msgin = 0;
- break;
- case BP_MSGOUT:
- ms->msgphase = msg_out;
- if (ms->n_msgout == 0) {
- if (ms->aborting) {
- do_abort(ms);
- } else {
- if (ms->last_n_msgout == 0) {
- printk(KERN_DEBUG
- "mesh: no msg to repeatn");
- ms->msgout[0] = NOP;
- ms->last_n_msgout = 1;
- }
- ms->n_msgout = ms->last_n_msgout;
- }
- }
- break;
- default:
- printk(KERN_DEBUG "mesh: unknown scsi phase %xn", phase);
- ms->stat = DID_ERROR;
- mesh_done(ms, 1);
- return;
- }
- start_phase(ms);
- }
- static void
- reselected(struct mesh_state *ms)
- {
- volatile struct mesh_regs *mr = ms->mesh;
- Scsi_Cmnd *cmd;
- struct mesh_target *tp;
- int b, t, prev;
- switch (ms->phase) {
- case idle:
- break;
- case arbitrating:
- if ((cmd = ms->current_req) != NULL) {
- /* put the command back on the queue */
- cmd->host_scribble = (void *) ms->request_q;
- if (ms->request_q == NULL)
- ms->request_qtail = cmd;
- ms->request_q = cmd;
- tp = &ms->tgts[cmd->target];
- tp->current_req = NULL;
- }
- break;
- case busfreeing:
- ms->phase = reselecting;
- mesh_done(ms, 0);
- break;
- case disconnecting:
- break;
- default:
- printk(KERN_ERR "mesh: reselected in phase %d/%d tgt %dn",
- ms->msgphase, ms->phase, ms->conn_tgt);
- dumplog(ms, ms->conn_tgt);
- dumpslog(ms);
- }
- if (ms->dma_started) {
- printk(KERN_ERR "mesh: reselected with DMA started !n");
- halt_dma(ms);
- }
- ms->current_req = NULL;
- ms->phase = dataing;
- ms->msgphase = msg_in;
- ms->n_msgout = 0;
- ms->last_n_msgout = 0;
- prev = ms->conn_tgt;
- /*
- * We seem to get abortive reselections sometimes.
- */
- while ((mr->bus_status1 & BS1_BSY) == 0) {
- static int mesh_aborted_resels;
- mesh_aborted_resels++;
- out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
- udelay(1);
- out_8(&mr->sequence, SEQ_ENBRESEL);
- udelay(5);
- dlog(ms, "extra resel err/exc/fc = %.6x",
- MKWORD(0, mr->error, mr->exception, mr->fifo_count));
- }
- out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
- udelay(1);
- out_8(&mr->sequence, SEQ_ENBRESEL);
- udelay(1);
- out_8(&mr->sync_params, ASYNC_PARAMS);
- /*
- * Find out who reselected us.
- */
- if (mr->fifo_count == 0) {
- printk(KERN_ERR "mesh: reselection but nothing in fifo?n");
- ms->conn_tgt = ms->host->this_id;
- goto bogus;
- }
- /* get the last byte in the fifo */
- do {
- b = in_8(&mr->fifo);
- dlog(ms, "reseldata %x", b);
- } while (in_8(&mr->fifo_count));
- for (t = 0; t < 8; ++t)
- if ((b & (1 << t)) != 0 && t != ms->host->this_id)
- break;
- if (b != (1 << t) + (1 << ms->host->this_id)) {
- printk(KERN_ERR "mesh: bad reselection data %xn", b);
- ms->conn_tgt = ms->host->this_id;
- goto bogus;
- }
- /*
- * Set up to continue with that target's transfer.
- */
- ms->conn_tgt = t;
- tp = &ms->tgts[t];
- out_8(&mr->sync_params, tp->sync_params);
- if (ALLOW_DEBUG(t)) {
- printk(KERN_DEBUG "mesh: reselected by target %dn", t);
- printk(KERN_DEBUG "mesh: saved_ptr=%x goes_out=%d cmd=%pn",
- tp->saved_ptr, tp->data_goes_out, tp->current_req);
- }
- ms->current_req = tp->current_req;
- if (tp->current_req == NULL) {
- printk(KERN_ERR "mesh: reselected by tgt %d but no cmd!n", t);
- goto bogus;
- }
- ms->data_ptr = tp->saved_ptr;
- dlog(ms, "resel prev tgt=%d", prev);
- dlog(ms, "resel err/exc=%.4x", MKWORD(0, 0, mr->error, mr->exception));
- start_phase(ms);
- return;
- bogus:
- dumplog(ms, ms->conn_tgt);
- dumpslog(ms);
- ms->data_ptr = 0;
- ms->aborting = 1;
- start_phase(ms);
- }
- static void do_abort(struct mesh_state *ms)
- {
- ms->msgout[0] = ABORT;
- ms->n_msgout = 1;
- ms->aborting = 1;
- ms->stat = DID_ABORT;
- dlog(ms, "abort", 0);
- }
- static void
- handle_reset(struct mesh_state *ms)
- {
- int tgt;
- struct mesh_target *tp;
- Scsi_Cmnd *cmd;
- volatile struct mesh_regs *mr = ms->mesh;
- for (tgt = 0; tgt < 8; ++tgt) {
- tp = &ms->tgts[tgt];
- if ((cmd = tp->current_req) != NULL) {
- cmd->result = DID_RESET << 16;
- tp->current_req = NULL;
- mesh_completed(ms, cmd);
- }
- ms->tgts[tgt].sdtr_state = do_sdtr;
- ms->tgts[tgt].sync_params = ASYNC_PARAMS;
- }
- ms->current_req = NULL;
- while ((cmd = ms->request_q) != NULL) {
- ms->request_q = (Scsi_Cmnd *) cmd->host_scribble;
- cmd->result = DID_RESET << 16;
- mesh_completed(ms, cmd);
- }
- ms->phase = idle;
- ms->msgphase = msg_none;
- out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
- out_8(&mr->sequence, SEQ_FLUSHFIFO);
- udelay(1);
- out_8(&mr->sync_params, ASYNC_PARAMS);
- out_8(&mr->sequence, SEQ_ENBRESEL);
- }
- static void
- do_mesh_interrupt(int irq, void *dev_id, struct pt_regs *ptregs)
- {
- unsigned long flags;
- spin_lock_irqsave(&io_request_lock, flags);
- mesh_interrupt(irq, dev_id, ptregs);
- spin_unlock_irqrestore(&io_request_lock, flags);
- }
- static void handle_error(struct mesh_state *ms)
- {
- int err, exc, count;
- volatile struct mesh_regs *mr = ms->mesh;
- err = in_8(&mr->error);
- exc = in_8(&mr->exception);
- out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
- dlog(ms, "error err/exc/fc/cl=%.8x",
- MKWORD(err, exc, mr->fifo_count, mr->count_lo));
- if (err & ERR_SCSIRESET) {
- /* SCSI bus was reset */
- printk(KERN_INFO "mesh: SCSI bus reset detected: "
- "waiting for end...");
- while ((mr->bus_status1 & BS1_RST) != 0)
- udelay(1);
- printk("donen");
- handle_reset(ms);
- /* request_q is empty, no point in mesh_start() */
- return;
- }
- if (err & ERR_UNEXPDISC) {
- /* Unexpected disconnect */
- if (exc & EXC_RESELECTED) {
- reselected(ms);
- return;
- }
- if (!ms->aborting) {
- printk(KERN_WARNING "mesh: target %d abortedn",
- ms->conn_tgt);
- dumplog(ms, ms->conn_tgt);
- dumpslog(ms);
- }
- out_8(&mr->interrupt, INT_CMDDONE);
- ms->stat = DID_ABORT;
- mesh_done(ms, 1);
- return;
- }
- if (err & ERR_PARITY) {
- if (ms->msgphase == msg_in) {
- printk(KERN_ERR "mesh: msg parity error, target %dn",
- ms->conn_tgt);
- ms->msgout[0] = MSG_PARITY_ERROR;
- ms->n_msgout = 1;
- ms->msgphase = msg_in_bad;
- cmd_complete(ms);
- return;
- }
- if (ms->stat == DID_OK) {
- printk(KERN_ERR "mesh: parity error, target %dn",
- ms->conn_tgt);
- ms->stat = DID_PARITY;
- }
- count = (mr->count_hi << 8) + mr->count_lo;
- if (count == 0) {
- cmd_complete(ms);
- } else {
- /* reissue the data transfer command */
- out_8(&mr->sequence, mr->sequence);
- }
- return;
- }
- if (err & ERR_SEQERR) {
- if (exc & EXC_RESELECTED) {
- /* This can happen if we issue a command to
- get the bus just after the target reselects us. */
- static int mesh_resel_seqerr;
- mesh_resel_seqerr++;
- reselected(ms);
- return;
- }
- if (exc == EXC_PHASEMM) {
- static int mesh_phasemm_seqerr;
- mesh_phasemm_seqerr++;
- phase_mismatch(ms);
- return;
- }
- printk(KERN_ERR "mesh: sequence error (err=%x exc=%x)n",
- err, exc);
- } else {
- printk(KERN_ERR "mesh: unknown error %x (exc=%x)n", err, exc);
- }
- mesh_dump_regs(ms);
- dumplog(ms, ms->conn_tgt);
- if (ms->phase > selecting && (mr->bus_status1 & BS1_BSY)) {
- /* try to do what the target wants */
- do_abort(ms);
- phase_mismatch(ms);
- return;
- }
- ms->stat = DID_ERROR;
- mesh_done(ms, 1);
- }
- static void handle_exception(struct mesh_state *ms)
- {
- int exc;
- volatile struct mesh_regs *mr = ms->mesh;
- exc = in_8(&mr->exception);
- out_8(&mr->interrupt, INT_EXCEPTION | INT_CMDDONE);
- if (exc & EXC_RESELECTED) {
- static int mesh_resel_exc;
- mesh_resel_exc++;
- reselected(ms);
- } else if (exc == EXC_ARBLOST) {
- printk(KERN_DEBUG "mesh: lost arbitrationn");
- ms->stat = DID_BUS_BUSY;
- mesh_done(ms, 1);
- } else if (exc == EXC_SELTO) {
- /* selection timed out */
- ms->stat = DID_BAD_TARGET;
- mesh_done(ms, 1);
- } else if (exc == EXC_PHASEMM) {
- /* target wants to do something different:
- find out what it wants and do it. */
- phase_mismatch(ms);
- } else {
- printk(KERN_ERR "mesh: can't cope with exception %xn", exc);
- mesh_dump_regs(ms);
- dumplog(ms, ms->conn_tgt);
- do_abort(ms);
- phase_mismatch(ms);
- }
- }
- static void
- mesh_interrupt(int irq, void *dev_id, struct pt_regs *ptregs)
- {
- struct mesh_state *ms = (struct mesh_state *) dev_id;
- volatile struct mesh_regs *mr = ms->mesh;
- int intr;
- #if 0
- if (ALLOW_DEBUG(ms->conn_tgt))
- printk(KERN_DEBUG "mesh_intr, bs0=%x int=%x exc=%x err=%x "
- "phase=%d msgphase=%dn", mr->bus_status0,
- mr->interrupt, mr->exception, mr->error,
- ms->phase, ms->msgphase);
- #endif
- while ((intr = in_8(&mr->interrupt)) != 0) {
- dlog(ms, "interrupt intr/err/exc/seq=%.8x",
- MKWORD(intr, mr->error, mr->exception, mr->sequence));
- if (intr & INT_ERROR) {
- handle_error(ms);
- } else if (intr & INT_EXCEPTION) {
- handle_exception(ms);
- } else if (intr & INT_CMDDONE) {
- out_8(&mr->interrupt, INT_CMDDONE);
- cmd_complete(ms);
- }
- }
- }
- static void
- handle_msgin(struct mesh_state *ms)
- {
- int i, code;
- Scsi_Cmnd *cmd = ms->current_req;
- struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
- if (ms->n_msgin == 0)
- return;
- code = ms->msgin[0];
- if (ALLOW_DEBUG(ms->conn_tgt)) {
- printk(KERN_DEBUG "got %d message bytes:", ms->n_msgin);
- for (i = 0; i < ms->n_msgin; ++i)
- printk(" %x", ms->msgin[i]);
- printk("n");
- }
- dlog(ms, "msgin msg=%.8x",
- MKWORD(ms->n_msgin, code, ms->msgin[1], ms->msgin[2]));
- ms->expect_reply = 0;
- ms->n_msgout = 0;
- if (ms->n_msgin < msgin_length(ms))
- goto reject;
- if (cmd)
- cmd->SCp.Message = code;
- switch (code) {
- case COMMAND_COMPLETE:
- break;
- case EXTENDED_MESSAGE:
- switch (ms->msgin[2]) {
- case EXTENDED_MODIFY_DATA_POINTER:
- ms->data_ptr += (ms->msgin[3] << 24) + ms->msgin[6]
- + (ms->msgin[4] << 16) + (ms->msgin[5] << 8);
- break;
- case EXTENDED_SDTR:
- if (tp->sdtr_state != sdtr_sent) {
- /* reply with an SDTR */
- add_sdtr_msg(ms);
- /* limit period to at least his value,
- offset to no more than his */
- if (ms->msgout[3] < ms->msgin[3])
- ms->msgout[3] = ms->msgin[3];
- if (ms->msgout[4] > ms->msgin[4])
- ms->msgout[4] = ms->msgin[4];
- set_sdtr(ms, ms->msgout[3], ms->msgout[4]);
- ms->msgphase = msg_out;
- } else {
- set_sdtr(ms, ms->msgin[3], ms->msgin[4]);
- }
- break;
- default:
- goto reject;
- }
- break;
- case SAVE_POINTERS:
- tp->saved_ptr = ms->data_ptr;
- break;
- case RESTORE_POINTERS:
- ms->data_ptr = tp->saved_ptr;
- break;
- case DISCONNECT:
- ms->phase = disconnecting;
- break;
- case ABORT:
- break;
- case MESSAGE_REJECT:
- if (tp->sdtr_state == sdtr_sent)
- set_sdtr(ms, 0, 0);
- break;
- case NOP:
- break;
- default:
- if (IDENTIFY_BASE <= code && code <= IDENTIFY_BASE + 7) {
- if (cmd == NULL) {
- do_abort(ms);
- ms->msgphase = msg_out;
- } else if (code != cmd->lun + IDENTIFY_BASE) {
- printk(KERN_WARNING "mesh: lun mismatch "
- "(%d != %d) on reselection from "
- "target %dn", i, cmd->lun,
- ms->conn_tgt);
- }
- break;
- }
- goto reject;
- }
- return;
- reject:
- printk(KERN_WARNING "mesh: rejecting message from target %d:",
- ms->conn_tgt);
- for (i = 0; i < ms->n_msgin; ++i)
- printk(" %x", ms->msgin[i]);
- printk("n");
- ms->msgout[0] = MESSAGE_REJECT;
- ms->n_msgout = 1;
- ms->msgphase = msg_out;
- }
- static void
- mesh_done(struct mesh_state *ms, int start_next)
- {
- Scsi_Cmnd *cmd;
- struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
- cmd = ms->current_req;
- ms->current_req = 0;
- tp->current_req = 0;
- if (cmd) {
- cmd->result = (ms->stat << 16) + cmd->SCp.Status;
- if (ms->stat == DID_OK)
- cmd->result += (cmd->SCp.Message << 8);
- if (DEBUG_TARGET(cmd)) {
- printk(KERN_DEBUG "mesh_done: result = %x, data_ptr=%d, buflen=%dn",
- cmd->result, ms->data_ptr, cmd->request_bufflen);
- if ((cmd->cmnd[0] == 0 || cmd->cmnd[0] == 0x12 || cmd->cmnd[0] == 3)
- && cmd->request_buffer != 0) {
- unsigned char *b = cmd->request_buffer;
- printk(KERN_DEBUG "buffer = %x %x %x %x %x %x %x %xn",
- b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7]);
- }
- }
- cmd->SCp.this_residual -= ms->data_ptr;
- mesh_completed(ms, cmd);
- }
- if (start_next) {
- out_8(&ms->mesh->sequence, SEQ_ENBRESEL);
- udelay(1);
- ms->phase = idle;
- mesh_start(ms);
- }
- }
- static void
- mesh_completed(struct mesh_state *ms, Scsi_Cmnd *cmd)
- {
- (*cmd->scsi_done)(cmd);
- }
- /*
- * Set up DMA commands for transferring data.
- */
- static void
- set_dma_cmds(struct mesh_state *ms, Scsi_Cmnd *cmd)
- {
- int i, dma_cmd, total, off, dtot;
- struct scatterlist *scl;
- struct dbdma_cmd *dcmds;
- dma_cmd = ms->tgts[ms->conn_tgt].data_goes_out?
- OUTPUT_MORE: INPUT_MORE;
- dcmds = ms->dma_cmds;
- dtot = 0;
- if (cmd) {
- cmd->SCp.this_residual = cmd->request_bufflen;
- if (cmd->use_sg > 0) {
- int nseg;
- total = 0;
- scl = (struct scatterlist *) cmd->buffer;
- off = ms->data_ptr;
- nseg = pci_map_sg(ms->pdev, scl, cmd->use_sg,
- scsi_to_pci_dma_dir(cmd ->sc_data_direction));
- for (i = 0; i <nseg; ++i, ++scl) {
- u32 dma_addr = sg_dma_address(scl);
- u32 dma_len = sg_dma_len(scl);
-
- total += scl->length;
- if (off >= dma_len) {
- off -= dma_len;
- continue;
- }
- if (dma_len > 0xffff)
- panic("mesh: scatterlist element >= 64k");
- st_le16(&dcmds->req_count, dma_len - off);
- st_le16(&dcmds->command, dma_cmd);
- st_le32(&dcmds->phy_addr, dma_addr + off);
- dcmds->xfer_status = 0;
- ++dcmds;
- dtot += dma_len - off;
- off = 0;
- }
- } else if (ms->data_ptr < cmd->request_bufflen) {
- dtot = cmd->request_bufflen - ms->data_ptr;
- if (dtot > 0xffff)
- panic("mesh: transfer size >= 64k");
- st_le16(&dcmds->req_count, dtot);
- /* XXX Use pci DMA API here ... */
- st_le32(&dcmds->phy_addr,
- virt_to_phys(cmd->request_buffer) + ms->data_ptr);
- dcmds->xfer_status = 0;
- ++dcmds;
- }
- }
- if (dtot == 0) {
- /* Either the target has overrun our buffer,
- or the caller didn't provide a buffer. */
- static char mesh_extra_buf[64];
- dtot = sizeof(mesh_extra_buf);
- st_le16(&dcmds->req_count, dtot);
- st_le32(&dcmds->phy_addr, virt_to_phys(mesh_extra_buf));
- dcmds->xfer_status = 0;
- ++dcmds;
- }
- dma_cmd += OUTPUT_LAST - OUTPUT_MORE;
- st_le16(&dcmds[-1].command, dma_cmd);
- memset(dcmds, 0, sizeof(*dcmds));
- st_le16(&dcmds->command, DBDMA_STOP);
- ms->dma_count = dtot;
- }
- static void
- halt_dma(struct mesh_state *ms)
- {
- volatile struct dbdma_regs *md = ms->dma;
- volatile struct mesh_regs *mr = ms->mesh;
- Scsi_Cmnd *cmd = ms->current_req;
- int t, nb;
- if (!ms->tgts[ms->conn_tgt].data_goes_out) {
- /* wait a little while until the fifo drains */
- t = 50;
- while (t > 0 && mr->fifo_count != 0
- && (in_le32(&md->status) & ACTIVE) != 0) {
- --t;
- udelay(1);
- }
- }
- out_le32(&md->control, RUN << 16); /* turn off RUN bit */
- nb = (mr->count_hi << 8) + mr->count_lo;
- dlog(ms, "halt_dma fc/count=%.6x",
- MKWORD(0, mr->fifo_count, 0, nb));
- if (ms->tgts[ms->conn_tgt].data_goes_out)
- nb += mr->fifo_count;
- /* nb is the number of bytes not yet transferred
- to/from the target. */
- ms->data_ptr -= nb;
- dlog(ms, "data_ptr %x", ms->data_ptr);
- if (ms->data_ptr < 0) {
- printk(KERN_ERR "mesh: halt_dma: data_ptr=%d (nb=%d, ms=%p)n",
- ms->data_ptr, nb, ms);
- ms->data_ptr = 0;
- #ifdef MESH_DBG
- dumplog(ms, ms->conn_tgt);
- dumpslog(ms);
- #endif /* MESH_DBG */
- } else if (cmd && cmd->request_bufflen != 0 &&
- ms->data_ptr > cmd->request_bufflen) {
- printk(KERN_DEBUG "mesh: target %d overrun, "
- "data_ptr=%x total=%x goes_out=%dn",
- ms->conn_tgt, ms->data_ptr, cmd->request_bufflen,
- ms->tgts[ms->conn_tgt].data_goes_out);
- }
- if (cmd->use_sg != 0) {
- struct scatterlist *sg;
- sg = (struct scatterlist *)cmd->request_buffer;
- pci_unmap_sg(ms->pdev, sg, cmd->use_sg,
- scsi_to_pci_dma_dir(cmd->sc_data_direction));
- }
- ms->dma_started = 0;
- }
- /*
- * Work out whether we expect data to go out from the host adaptor or into it.
- * (If this information is available from somewhere else in the scsi
- * code, somebody please let me know :-)
- */
- static int
- data_goes_out(Scsi_Cmnd *cmd)
- {
- switch (cmd->cmnd[0]) {
- case CHANGE_DEFINITION:
- case COMPARE:
- case COPY:
- case COPY_VERIFY:
- case FORMAT_UNIT:
- case LOG_SELECT:
- case MEDIUM_SCAN:
- case MODE_SELECT:
- case MODE_SELECT_10:
- case REASSIGN_BLOCKS:
- case RESERVE:
- case SEARCH_EQUAL:
- case SEARCH_EQUAL_12:
- case SEARCH_HIGH:
- case SEARCH_HIGH_12:
- case SEARCH_LOW:
- case SEARCH_LOW_12:
- case SEND_DIAGNOSTIC:
- case SEND_VOLUME_TAG:
- case SET_WINDOW:
- case UPDATE_BLOCK:
- case WRITE_BUFFER:
- case WRITE_6:
- case WRITE_10:
- case WRITE_12:
- case WRITE_LONG:
- case WRITE_LONG_2: /* alternate code for WRITE_LONG */
- case WRITE_SAME:
- case WRITE_VERIFY:
- case WRITE_VERIFY_12:
- return 1;
- default:
- return 0;
- }
- }
- #ifdef MESH_DBG
- static inline u32 readtb(void)
- {
- u32 tb;
- #ifdef DBG_USE_TB
- /* Beware: if you enable this, it will crash on 601s. */
- asm ("mftb %0" : "=r" (tb) : );
- #else
- tb = 0;
- #endif
- return tb;
- }
- static void dlog(struct mesh_state *ms, char *fmt, int a)
- {
- struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
- struct dbglog *tlp, *slp;
- tlp = &tp->log[tp->log_ix];
- slp = &ms->log[ms->log_ix];
- tlp->fmt = fmt;
- tlp->tb = readtb();
- tlp->phase = (ms->msgphase << 4) + ms->phase;
- tlp->bs0 = ms->mesh->bus_status0;
- tlp->bs1 = ms->mesh->bus_status1;
- tlp->tgt = ms->conn_tgt;
- tlp->d = a;
- *slp = *tlp;
- if (++tp->log_ix >= N_DBG_LOG)
- tp->log_ix = 0;
- if (tp->n_log < N_DBG_LOG)
- ++tp->n_log;
- if (++ms->log_ix >= N_DBG_SLOG)
- ms->log_ix = 0;
- if (ms->n_log < N_DBG_SLOG)
- ++ms->n_log;
- }
- static void dumplog(struct mesh_state *ms, int t)
- {
- struct mesh_target *tp = &ms->tgts[t];
- struct dbglog *lp;
- int i;
- if (tp->n_log == 0)
- return;
- i = tp->log_ix - tp->n_log;
- if (i < 0)
- i += N_DBG_LOG;
- tp->n_log = 0;
- do {
- lp = &tp->log[i];
- printk(KERN_DEBUG "mesh log %d: bs=%.2x%.2x ph=%.2x ",
- t, lp->bs1, lp->bs0, lp->phase);
- #ifdef DBG_USE_TB
- printk("tb=%10u ", lp->tb);
- #endif
- printk(lp->fmt, lp->d);
- printk("n");
- if (++i >= N_DBG_LOG)
- i = 0;
- } while (i != tp->log_ix);
- }
- static void dumpslog(struct mesh_state *ms)
- {
- struct dbglog *lp;
- int i;
- if (ms->n_log == 0)
- return;
- i = ms->log_ix - ms->n_log;
- if (i < 0)
- i += N_DBG_SLOG;
- ms->n_log = 0;
- do {
- lp = &ms->log[i];
- printk(KERN_DEBUG "mesh log: bs=%.2x%.2x ph=%.2x t%d ",
- lp->bs1, lp->bs0, lp->phase, lp->tgt);
- #ifdef DBG_USE_TB
- printk("tb=%10u ", lp->tb);
- #endif
- printk(lp->fmt, lp->d);
- printk("n");
- if (++i >= N_DBG_SLOG)
- i = 0;
- } while (i != ms->log_ix);
- }
- #endif /* MESH_DBG */
- static Scsi_Host_Template driver_template = SCSI_MESH;
- #include "scsi_module.c"