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-rw-r--r--drivers/scsi/mesh.c2062
1 files changed, 2062 insertions, 0 deletions
diff --git a/drivers/scsi/mesh.c b/drivers/scsi/mesh.c
new file mode 100644
index 000000000000..85f3a74ac421
--- /dev/null
+++ b/drivers/scsi/mesh.c
@@ -0,0 +1,2062 @@
+/*
+ * 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. 21 2002 - BenH Rework bus reset code for new error handler
+ * Add delay after initial bus reset
+ * Add module parameters
+ *
+ * Sep. 27 2003 - BenH Move to new driver model, fix some write posting
+ * issues
+ * To do:
+ * - handle aborts correctly
+ * - retry arbitration if lost (unless higher levels do this for us)
+ * - power down the chip when no device is detected
+ */
+#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/blkdev.h>
+#include <linux/proc_fs.h>
+#include <linux/stat.h>
+#include <linux/interrupt.h>
+#include <linux/reboot.h>
+#include <linux/spinlock.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>
+#include <asm/macio.h>
+
+#include <scsi/scsi.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_host.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");
+
+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;
+
+module_param(sync_rate, int, 0);
+MODULE_PARM_DESC(sync_rate, "Synchronous rate (0..10, 0=async)");
+module_param(sync_targets, int, 0);
+MODULE_PARM_DESC(sync_targets, "Bitmask of targets allowed to set synchronous");
+module_param(resel_targets, int, 0);
+MODULE_PARM_DESC(resel_targets, "Bitmask of targets allowed to set disconnect");
+module_param(debug_targets, int, 0644);
+MODULE_PARM_DESC(debug_targets, "Bitmask of debugged targets");
+module_param(init_reset_delay, int, 0);
+MODULE_PARM_DESC(init_reset_delay, "Initial bus reset delay (0=no reset)");
+
+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)->device->id))
+
+#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 */
+ struct 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 __iomem *mesh;
+ int meshintr;
+ volatile struct dbdma_regs __iomem *dma;
+ int dmaintr;
+ struct Scsi_Host *host;
+ struct mesh_state *next;
+ struct scsi_cmnd *request_q;
+ struct 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 */
+ struct 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 */
+ dma_addr_t dma_cmd_bus;
+ void *dma_cmd_space;
+ int dma_cmd_size;
+ int clk_freq;
+ struct mesh_target tgts[8];
+ struct macio_dev *mdev;
+ struct pci_dev* pdev;
+#ifdef MESH_DBG
+ int log_ix;
+ int n_log;
+ struct dbglog log[N_DBG_SLOG];
+#endif
+};
+
+/*
+ * Driver is too messy, we need a few prototypes...
+ */
+static void mesh_done(struct mesh_state *ms, int start_next);
+static void mesh_interrupt(int irq, void *dev_id, struct pt_regs *ptregs);
+static void cmd_complete(struct mesh_state *ms);
+static void set_dma_cmds(struct mesh_state *ms, struct scsi_cmnd *cmd);
+static void halt_dma(struct mesh_state *ms);
+static void phase_mismatch(struct mesh_state *ms);
+
+
+/*
+ * Some debugging & logging routines
+ */
+
+#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);
+}
+
+#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 void
+mesh_dump_regs(struct mesh_state *ms)
+{
+ volatile struct mesh_regs __iomem *mr = ms->mesh;
+ volatile struct dbdma_regs __iomem *md = ms->dma;
+ int t;
+ struct mesh_target *tp;
+
+ printk(KERN_DEBUG "mesh: state at %p, regs at %p, dma at %p\n",
+ ms, mr, md);
+ printk(KERN_DEBUG " ct=%4x seq=%2x bs=%4x fc=%2x "
+ "exc=%2x err=%2x im=%2x int=%2x sp=%2x\n",
+ (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=%.2x\n",in_8(&mr->fifo));
+ printk(KERN_DEBUG " dma stat=%x cmdptr=%x\n",
+ in_le32(&md->status), in_le32(&md->cmdptr));
+ printk(KERN_DEBUG " phase=%d msgphase=%d conn_tgt=%d data_ptr=%d\n",
+ ms->phase, ms->msgphase, ms->conn_tgt, ms->data_ptr);
+ printk(KERN_DEBUG " dma_st=%d dma_ct=%d n_msgout=%d\n",
+ 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=%d\n",
+ t, tp->current_req, tp->data_goes_out, tp->saved_ptr);
+ }
+}
+
+
+/*
+ * Flush write buffers on the bus path to the mesh
+ */
+static inline void mesh_flush_io(volatile struct mesh_regs __iomem *mr)
+{
+ (void)in_8(&mr->mesh_id);
+}
+
+
+/*
+ * Complete a SCSI command
+ */
+static void mesh_completed(struct mesh_state *ms, struct scsi_cmnd *cmd)
+{
+ (*cmd->scsi_done)(cmd);
+}
+
+
+/* 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 __iomem *mr = ms->mesh;
+ volatile struct dbdma_regs __iomem *md = ms->dma;
+
+ mesh_flush_io(mr);
+ 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);
+ mesh_flush_io(mr);
+ 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 */
+ mesh_flush_io(mr);
+ udelay(30); /* leave it on for >= 25us */
+ out_8(&mr->bus_status1, 0); /* negate RST */
+ mesh_flush_io(mr);
+
+ /* Wait for bus to come back */
+ msleep(init_reset_delay);
+ }
+
+ /* Reconfigure controller */
+ out_8(&mr->interrupt, 0xff); /* clear all interrupt bits */
+ out_8(&mr->sequence, SEQ_FLUSHFIFO);
+ mesh_flush_io(mr);
+ udelay(1);
+ out_8(&mr->sync_params, ASYNC_PARAMS);
+ out_8(&mr->sequence, SEQ_ENBRESEL);
+
+ ms->phase = idle;
+ ms->msgphase = msg_none;
+}
+
+
+static void mesh_start_cmd(struct mesh_state *ms, struct scsi_cmnd *cmd)
+{
+ volatile struct mesh_regs __iomem *mr = ms->mesh;
+ int t, id;
+
+ id = cmd->device->id;
+ ms->current_req = cmd;
+ ms->tgts[id].data_goes_out = cmd->sc_data_direction == DMA_TO_DEVICE;
+ ms->tgts[id].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, id);
+ for (i = 0; i < cmd->cmd_len; ++i)
+ printk(" %x", cmd->cmnd[i]);
+ printk(" use_sg=%d buffer=%p bufflen=%u\n",
+ 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 = id;
+ ms->tgts[id].saved_ptr = 0;
+ ms->stat = DID_OK;
+ ms->aborting = 0;
+#ifdef MESH_DBG
+ ms->tgts[id].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);
+ mesh_flush_io(mr);
+ udelay(1);
+
+ if (in_8(&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 ((in_8(&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, NULL);
+ if (ms->phase != arbitrating)
+ return;
+ }
+ udelay(1);
+ }
+ if (in_8(&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, NULL);
+ 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 (in_8(&mr->interrupt) == 0 && (in_8(&mr->bus_status1) & BS1_SEL)
+ && (in_8(&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);
+ mesh_flush_io(mr);
+ 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);
+ mesh_flush_io(mr);
+ for (t = 10; t > 0 && in_8(&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 (in_8(&mr->interrupt) == 0 && (in_8(&mr->bus_status1) & BS1_SEL)
+ && (in_8(&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
+ }
+}
+
+/*
+ * Start the next command for a MESH.
+ * Should be called with interrupts disabled.
+ */
+static void mesh_start(struct mesh_state *ms)
+{
+ struct 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 = (struct scsi_cmnd *) cmd->host_scribble) {
+ if (cmd == NULL)
+ return;
+ if (ms->tgts[cmd->device->id].current_req == NULL)
+ break;
+ prev = cmd;
+ }
+ next = (struct 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_done(struct mesh_state *ms, int start_next)
+{
+ struct scsi_cmnd *cmd;
+ struct mesh_target *tp = &ms->tgts[ms->conn_tgt];
+
+ cmd = ms->current_req;
+ ms->current_req = NULL;
+ tp->current_req = NULL;
+ 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=%d\n",
+ 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 %x\n",
+ 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);
+ mesh_flush_io(ms->mesh);
+ udelay(1);
+ ms->phase = idle;
+ mesh_start(ms);
+ }
+}
+
+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 __iomem *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 asynchronous\n",
+ 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/s\n",
+ ms->conn_tgt, tr/10, tr%10);
+}
+
+static void start_phase(struct mesh_state *ms)
+{
+ int i, seq, nb;
+ volatile struct mesh_regs __iomem *mr = ms->mesh;
+ volatile struct dbdma_regs __iomem *md = ms->dma;
+ struct 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=%d\n",
+ 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);
+ mesh_flush_io(mr);
+ udelay(1);
+ /*
+ * If ATN is not already asserted, we assert it, then
+ * issue a SEQ_MSGOUT to get the mesh to drop ACK.
+ */
+ if ((in_8(&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 */
+ mesh_flush_io(mr);
+ 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=%d\n",
+ 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);
+ mesh_flush_io(mr);
+ 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=%d\n",
+ ms->phase);
+ dumpslog(ms);
+ }
+
+}
+
+static inline void get_msgin(struct mesh_state *ms)
+{
+ volatile struct mesh_regs __iomem *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 reselected(struct mesh_state *ms)
+{
+ volatile struct mesh_regs __iomem *mr = ms->mesh;
+ struct 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->device->id];
+ 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 %d\n",
+ 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 ((in_8(&mr->bus_status1) & BS1_BSY) == 0) {
+ static int mesh_aborted_resels;
+ mesh_aborted_resels++;
+ out_8(&mr->interrupt, INT_ERROR | INT_EXCEPTION | INT_CMDDONE);
+ mesh_flush_io(mr);
+ udelay(1);
+ out_8(&mr->sequence, SEQ_ENBRESEL);
+ mesh_flush_io(mr);
+ 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);
+ mesh_flush_io(mr);
+ udelay(1);
+ out_8(&mr->sequence, SEQ_ENBRESEL);
+ mesh_flush_io(mr);
+ udelay(1);
+ out_8(&mr->sync_params, ASYNC_PARAMS);
+
+ /*
+ * Find out who reselected us.
+ */
+ if (in_8(&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 %x\n", 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 %d\n", t);
+ printk(KERN_DEBUG "mesh: saved_ptr=%x goes_out=%d cmd=%p\n",
+ 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;
+ struct scsi_cmnd *cmd;
+ volatile struct mesh_regs __iomem *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 = (struct 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);
+ mesh_flush_io(mr);
+ udelay(1);
+ out_8(&mr->sync_params, ASYNC_PARAMS);
+ out_8(&mr->sequence, SEQ_ENBRESEL);
+}
+
+static irqreturn_t do_mesh_interrupt(int irq, void *dev_id, struct pt_regs *ptregs)
+{
+ unsigned long flags;
+ struct Scsi_Host *dev = ((struct mesh_state *)dev_id)->host;
+
+ spin_lock_irqsave(dev->host_lock, flags);
+ mesh_interrupt(irq, dev_id, ptregs);
+ spin_unlock_irqrestore(dev->host_lock, flags);
+ return IRQ_HANDLED;
+}
+
+static void handle_error(struct mesh_state *ms)
+{
+ int err, exc, count;
+ volatile struct mesh_regs __iomem *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 ((in_8(&mr->bus_status1) & BS1_RST) != 0)
+ udelay(1);
+ printk("done\n");
+ 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 aborted\n",
+ 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 %d\n",
+ 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 %d\n",
+ 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 && (in_8(&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 __iomem *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 arbitration\n");
+ 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 %x\n", exc);
+ mesh_dump_regs(ms);
+ dumplog(ms, ms->conn_tgt);
+ do_abort(ms);
+ phase_mismatch(ms);
+ }
+}
+
+static void handle_msgin(struct mesh_state *ms)
+{
+ int i, code;
+ struct 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->device->lun + IDENTIFY_BASE) {
+ printk(KERN_WARNING "mesh: lun mismatch "
+ "(%d != %d) on reselection from "
+ "target %d\n", code - IDENTIFY_BASE,
+ cmd->device->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;
+}
+
+/*
+ * Set up DMA commands for transferring data.
+ */
+static void set_dma_cmds(struct mesh_state *ms, struct 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,
+ 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 __iomem *md = ms->dma;
+ volatile struct mesh_regs __iomem *mr = ms->mesh;
+ struct 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 && in_8(&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=%d\n",
+ 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, cmd->sc_data_direction);
+ }
+ ms->dma_started = 0;
+}
+
+static void phase_mismatch(struct mesh_state *ms)
+{
+ volatile struct mesh_regs __iomem *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 = in_8(&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);
+ mesh_flush_io(mr);
+ 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);
+ mesh_flush_io(mr);
+ 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 repeat\n");
+ 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 %x\n", phase);
+ ms->stat = DID_ERROR;
+ mesh_done(ms, 1);
+ return;
+ }
+
+ start_phase(ms);
+}
+
+static void cmd_complete(struct mesh_state *ms)
+{
+ volatile struct mesh_regs __iomem *mr = ms->mesh;
+ struct 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);
+ mesh_flush_io(mr);
+ 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 ((in_8(&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_out\n",
+ in_8(&mr->error));
+ handle_error(ms);
+ return;
+ }
+ if (in_8(&mr->exception) != EXC_PHASEMM)
+ printk(KERN_ERR "mesh: exc %x in msg_out\n",
+ in_8(&mr->exception));
+ else
+ printk(KERN_DEBUG "mesh: bs0=%x in msg_out\n",
+ in_8(&mr->bus_status0));
+ handle_exception(ms);
+ return;
+ }
+ if (in_8(&mr->bus_status0) & BS0_REQ) {
+ out_8(&mr->sequence, SEQ_MSGOUT + use_active_neg);
+ mesh_flush_io(mr);
+ 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->device->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 ((in_8(&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 %x\n",
+ cmd->SCp.Status);
+ }
+ ms->msgphase = msg_in;
+ break;
+ case busfreeing:
+ mesh_done(ms, 1);
+ return;
+ case disconnecting:
+ ms->current_req = NULL;
+ ms->phase = idle;
+ mesh_start(ms);
+ return;
+ default:
+ break;
+ }
+ ++ms->phase;
+ start_phase(ms);
+ break;
+ }
+}
+
+
+/*
+ * Called by midlayer with host locked to queue a new
+ * request
+ */
+static int mesh_queue(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
+{
+ struct mesh_state *ms;
+
+ cmd->scsi_done = done;
+ cmd->host_scribble = NULL;
+
+ ms = (struct mesh_state *) cmd->device->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;
+}
+
+/*
+ * Called to handle interrupts, either call by the interrupt
+ * handler (do_mesh_interrupt) or by other functions in
+ * exceptional circumstances
+ */
+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 __iomem *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=%d\n", 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);
+ }
+ }
+}
+
+/* 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.
+ */
+static int mesh_abort(struct scsi_cmnd *cmd)
+{
+ struct mesh_state *ms = (struct mesh_state *) cmd->device->host->hostdata;
+
+ printk(KERN_DEBUG "mesh_abort(%p)\n", cmd);
+ mesh_dump_regs(ms);
+ dumplog(ms, cmd->device->id);
+ dumpslog(ms);
+ return FAILED;
+}
+
+/*
+ * 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
+ */
+static int mesh_host_reset(struct scsi_cmnd *cmd)
+{
+ struct mesh_state *ms = (struct mesh_state *) cmd->device->host->hostdata;
+ volatile struct mesh_regs __iomem *mr = ms->mesh;
+ volatile struct dbdma_regs __iomem *md = ms->dma;
+
+ printk(KERN_DEBUG "mesh_host_reset\n");
+
+ /* 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);
+ mesh_flush_io(mr);
+ 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 */
+ mesh_flush_io(mr);
+ udelay(30); /* leave it on for >= 25us */
+ out_8(&mr->bus_status1, 0); /* negate RST */
+
+ /* Complete pending commands */
+ handle_reset(ms);
+
+ return SUCCESS;
+}
+
+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, macio_get_of_node(ms->mdev), 0, 1);
+ msleep(200);
+ } else {
+ pmac_call_feature(PMAC_FTR_MESH_ENABLE, macio_get_of_node(ms->mdev), 0, 0);
+ msleep(10);
+ }
+}
+
+
+#ifdef CONFIG_PM
+static int mesh_suspend(struct macio_dev *mdev, u32 state)
+{
+ struct mesh_state *ms = (struct mesh_state *)macio_get_drvdata(mdev);
+ unsigned long flags;
+
+ if (state == mdev->ofdev.dev.power.power_state || state < 2)
+ return 0;
+
+ scsi_block_requests(ms->host);
+ spin_lock_irqsave(ms->host->host_lock, flags);
+ while(ms->phase != idle) {
+ spin_unlock_irqrestore(ms->host->host_lock, flags);
+ msleep(10);
+ spin_lock_irqsave(ms->host->host_lock, flags);
+ }
+ ms->phase = sleeping;
+ spin_unlock_irqrestore(ms->host->host_lock, flags);
+ disable_irq(ms->meshintr);
+ set_mesh_power(ms, 0);
+
+ mdev->ofdev.dev.power.power_state = state;
+
+ return 0;
+}
+
+static int mesh_resume(struct macio_dev *mdev)
+{
+ struct mesh_state *ms = (struct mesh_state *)macio_get_drvdata(mdev);
+ unsigned long flags;
+
+ if (mdev->ofdev.dev.power.power_state == 0)
+ return 0;
+
+ set_mesh_power(ms, 1);
+ mesh_init(ms);
+ spin_lock_irqsave(ms->host->host_lock, flags);
+ mesh_start(ms);
+ spin_unlock_irqrestore(ms->host->host_lock, flags);
+ enable_irq(ms->meshintr);
+ scsi_unblock_requests(ms->host);
+
+ mdev->ofdev.dev.power.power_state = 0;
+
+ return 0;
+}
+
+#endif /* CONFIG_PM */
+
+/*
+ * 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_shutdown(struct macio_dev *mdev)
+{
+ struct mesh_state *ms = (struct mesh_state *)macio_get_drvdata(mdev);
+ volatile struct mesh_regs __iomem *mr;
+ unsigned long flags;
+
+ printk(KERN_INFO "resetting MESH scsi bus(es)\n");
+ spin_lock_irqsave(ms->host->host_lock, flags);
+ 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);
+ mesh_flush_io(mr);
+ udelay(30);
+ out_8(&mr->bus_status1, 0);
+ spin_unlock_irqrestore(ms->host->host_lock, flags);
+
+ return 0;
+}
+
+static struct scsi_host_template mesh_template = {
+ .proc_name = "mesh",
+ .name = "MESH",
+ .queuecommand = mesh_queue,
+ .eh_abort_handler = mesh_abort,
+ .eh_host_reset_handler = mesh_host_reset,
+ .can_queue = 20,
+ .this_id = 7,
+ .sg_tablesize = SG_ALL,
+ .cmd_per_lun = 2,
+ .use_clustering = DISABLE_CLUSTERING,
+};
+
+static int mesh_probe(struct macio_dev *mdev, const struct of_match *match)
+{
+ struct device_node *mesh = macio_get_of_node(mdev);
+ struct pci_dev* pdev = macio_get_pci_dev(mdev);
+ int tgt, *cfp, minper;
+ struct mesh_state *ms;
+ struct Scsi_Host *mesh_host;
+ void *dma_cmd_space;
+ dma_addr_t dma_cmd_bus;
+
+ switch (mdev->bus->chip->type) {
+ case macio_heathrow:
+ case macio_gatwick:
+ case macio_paddington:
+ use_active_neg = 0;
+ break;
+ default:
+ use_active_neg = SEQ_ACTIVE_NEG;
+ }
+
+ if (macio_resource_count(mdev) != 2 || macio_irq_count(mdev) != 2) {
+ printk(KERN_ERR "mesh: expected 2 addrs and 2 intrs"
+ " (got %d,%d)\n", mesh->n_addrs, mesh->n_intrs);
+ return -ENODEV;
+ }
+
+ if (macio_request_resources(mdev, "mesh") != 0) {
+ printk(KERN_ERR "mesh: unable to request memory resources");
+ return -EBUSY;
+ }
+ mesh_host = scsi_host_alloc(&mesh_template, sizeof(struct mesh_state));
+ if (mesh_host == NULL) {
+ printk(KERN_ERR "mesh: couldn't register host");
+ goto out_release;
+ }
+
+ /* Old junk for root discovery, that will die ultimately */
+#if !defined(MODULE)
+ note_scsi_host(mesh, mesh_host);
+#endif
+
+ mesh_host->base = macio_resource_start(mdev, 0);
+ mesh_host->irq = macio_irq(mdev, 0);
+ ms = (struct mesh_state *) mesh_host->hostdata;
+ macio_set_drvdata(mdev, ms);
+ ms->host = mesh_host;
+ ms->mdev = mdev;
+ ms->pdev = pdev;
+
+ ms->mesh = ioremap(macio_resource_start(mdev, 0), 0x1000);
+ if (ms->mesh == NULL) {
+ printk(KERN_ERR "mesh: can't map registers\n");
+ goto out_free;
+ }
+ ms->dma = ioremap(macio_resource_start(mdev, 1), 0x1000);
+ if (ms->dma == NULL) {
+ printk(KERN_ERR "mesh: can't map registers\n");
+ iounmap(ms->mesh);
+ goto out_free;
+ }
+
+ ms->meshintr = macio_irq(mdev, 0);
+ ms->dmaintr = macio_irq(mdev, 1);
+
+ /* Space for dma command list: +1 for stop command,
+ * +1 to allow for aligning.
+ */
+ ms->dma_cmd_size = (mesh_host->sg_tablesize + 2) * sizeof(struct dbdma_cmd);
+
+ /* We use the PCI APIs for now until the generic one gets fixed
+ * enough or until we get some macio-specific versions
+ */
+ dma_cmd_space = pci_alloc_consistent(macio_get_pci_dev(mdev),
+ ms->dma_cmd_size,
+ &dma_cmd_bus);
+ if (dma_cmd_space == NULL) {
+ printk(KERN_ERR "mesh: can't allocate DMA table\n");
+ goto out_unmap;
+ }
+ memset(dma_cmd_space, 0, ms->dma_cmd_size);
+
+ ms->dma_cmds = (struct dbdma_cmd *) DBDMA_ALIGN(dma_cmd_space);
+ ms->dma_cmd_space = dma_cmd_space;
+ ms->dma_cmd_bus = dma_cmd_bus + ((unsigned long)ms->dma_cmds)
+ - (unsigned long)dma_cmd_space;
+ ms->current_req = NULL;
+ 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 = NULL;
+ }
+
+ if ((cfp = (int *) get_property(mesh, "clock-frequency", NULL)))
+ ms->clk_freq = *cfp;
+ else {
+ printk(KERN_INFO "mesh: assuming 50MHz clock frequency\n");
+ 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;
+
+ /* Power up the chip */
+ set_mesh_power(ms, 1);
+
+ /* Set it up */
+ mesh_init(ms);
+
+ /* XXX FIXME: error should be fatal */
+ if (request_irq(ms->meshintr, do_mesh_interrupt, 0, "MESH", ms))
+ printk(KERN_ERR "MESH: can't get irq %d\n", ms->meshintr);
+
+ /* XXX FIXME: handle failure */
+ scsi_add_host(mesh_host, &mdev->ofdev.dev);
+ scsi_scan_host(mesh_host);
+
+ return 0;
+
+out_unmap:
+ iounmap(ms->dma);
+ iounmap(ms->mesh);
+out_free:
+ scsi_host_put(mesh_host);
+out_release:
+ macio_release_resources(mdev);
+
+ return -ENODEV;
+}
+
+static int mesh_remove(struct macio_dev *mdev)
+{
+ struct mesh_state *ms = (struct mesh_state *)macio_get_drvdata(mdev);
+ struct Scsi_Host *mesh_host = ms->host;
+
+ scsi_remove_host(mesh_host);
+
+ free_irq(ms->meshintr, ms);
+
+ /* Reset scsi bus */
+ mesh_shutdown(mdev);
+
+ /* Shut down chip & termination */
+ set_mesh_power(ms, 0);
+
+ /* Unmap registers & dma controller */
+ iounmap(ms->mesh);
+ iounmap(ms->dma);
+
+ /* Free DMA commands memory */
+ pci_free_consistent(macio_get_pci_dev(mdev), ms->dma_cmd_size,
+ ms->dma_cmd_space, ms->dma_cmd_bus);
+
+ /* Release memory resources */
+ macio_release_resources(mdev);
+
+ scsi_host_put(mesh_host);
+
+ return 0;
+}
+
+
+static struct of_match mesh_match[] =
+{
+ {
+ .name = "mesh",
+ .type = OF_ANY_MATCH,
+ .compatible = OF_ANY_MATCH
+ },
+ {
+ .name = OF_ANY_MATCH,
+ .type = "scsi",
+ .compatible = "chrp,mesh0"
+ },
+ {},
+};
+
+static struct macio_driver mesh_driver =
+{
+ .name = "mesh",
+ .match_table = mesh_match,
+ .probe = mesh_probe,
+ .remove = mesh_remove,
+ .shutdown = mesh_shutdown,
+#ifdef CONFIG_PM
+ .suspend = mesh_suspend,
+ .resume = mesh_resume,
+#endif
+};
+
+
+static int __init init_mesh(void)
+{
+
+ /* 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/s\n", sync_rate);
+ mesh_sync_period = 1000 / sync_rate; /* ns */
+ mesh_sync_offset = 15;
+ } else
+ printk(KERN_INFO "mesh: configured for asynchronous\n");
+
+ return macio_register_driver(&mesh_driver);
+}
+
+static void __exit exit_mesh(void)
+{
+ return macio_unregister_driver(&mesh_driver);
+}
+
+module_init(init_mesh);
+module_exit(exit_mesh);
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-19 11:12:35 +0000