1 files changed, 203 insertions, 83 deletions

diff --git a/drivers/scsi/esp_scsi.c b/drivers/scsi/esp_scsi.c
index c3fc34b9964d..ac7da9db7317 100644
--- a/drivers/scsi/esp_scsi.c
+++ b/drivers/scsi/esp_scsi.c
@@ -369,19 +369,28 @@ static void esp_map_dma(struct esp *esp, struct scsi_cmnd *cmd)
 {
 	struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd);
 	struct scatterlist *sg = scsi_sglist(cmd);
-	int dir = cmd->sc_data_direction;
-	int total, i;
+	int total = 0, i;
 
-	if (dir == DMA_NONE)
+	if (cmd->sc_data_direction == DMA_NONE)
 		return;
 
-	spriv->u.num_sg = esp->ops->map_sg(esp, sg, scsi_sg_count(cmd), dir);
+	if (esp->flags & ESP_FLAG_NO_DMA_MAP) {
+		/*
+		 * For pseudo DMA and PIO we need the virtual address instead of
+		 * a dma address, so perform an identity mapping.
+		 */
+		spriv->num_sg = scsi_sg_count(cmd);
+		for (i = 0; i < spriv->num_sg; i++) {
+			sg[i].dma_address = (uintptr_t)sg_virt(&sg[i]);
+			total += sg_dma_len(&sg[i]);
+		}
+	} else {
+		spriv->num_sg = scsi_dma_map(cmd);
+		for (i = 0; i < spriv->num_sg; i++)
+			total += sg_dma_len(&sg[i]);
+	}
 	spriv->cur_residue = sg_dma_len(sg);
 	spriv->cur_sg = sg;
-
-	total = 0;
-	for (i = 0; i < spriv->u.num_sg; i++)
-		total += sg_dma_len(&sg[i]);
 	spriv->tot_residue = total;
 }
 
@@ -441,13 +450,8 @@ static void esp_advance_dma(struct esp *esp, struct esp_cmd_entry *ent,
 
 static void esp_unmap_dma(struct esp *esp, struct scsi_cmnd *cmd)
 {
-	struct esp_cmd_priv *spriv = ESP_CMD_PRIV(cmd);
-	int dir = cmd->sc_data_direction;
-
-	if (dir == DMA_NONE)
-		return;
-
-	esp->ops->unmap_sg(esp, scsi_sglist(cmd), spriv->u.num_sg, dir);
+	if (!(esp->flags & ESP_FLAG_NO_DMA_MAP))
+		scsi_dma_unmap(cmd);
 }
 
 static void esp_save_pointers(struct esp *esp, struct esp_cmd_entry *ent)
@@ -478,17 +482,6 @@ static void esp_restore_pointers(struct esp *esp, struct esp_cmd_entry *ent)
 	spriv->tot_residue = ent->saved_tot_residue;
 }
 
-static void esp_check_command_len(struct esp *esp, struct scsi_cmnd *cmd)
-{
-	if (cmd->cmd_len == 6 ||
-	    cmd->cmd_len == 10 ||
-	    cmd->cmd_len == 12) {
-		esp->flags &= ~ESP_FLAG_DOING_SLOWCMD;
-	} else {
-		esp->flags |= ESP_FLAG_DOING_SLOWCMD;
-	}
-}
-
 static void esp_write_tgt_config3(struct esp *esp, int tgt)
 {
 	if (esp->rev > ESP100A) {
@@ -624,6 +617,26 @@ static void esp_free_lun_tag(struct esp_cmd_entry *ent,
 	}
 }
 
+static void esp_map_sense(struct esp *esp, struct esp_cmd_entry *ent)
+{
+	ent->sense_ptr = ent->cmd->sense_buffer;
+	if (esp->flags & ESP_FLAG_NO_DMA_MAP) {
+		ent->sense_dma = (uintptr_t)ent->sense_ptr;
+		return;
+	}
+
+	ent->sense_dma = dma_map_single(esp->dev, ent->sense_ptr,
+					SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
+}
+
+static void esp_unmap_sense(struct esp *esp, struct esp_cmd_entry *ent)
+{
+	if (!(esp->flags & ESP_FLAG_NO_DMA_MAP))
+		dma_unmap_single(esp->dev, ent->sense_dma,
+				 SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
+	ent->sense_ptr = NULL;
+}
+
 /* When a contingent allegiance conditon is created, we force feed a
  * REQUEST_SENSE command to the device to fetch the sense data.  I
  * tried many other schemes, relying on the scsi error handling layer
@@ -645,12 +658,7 @@ static void esp_autosense(struct esp *esp, struct esp_cmd_entry *ent)
 	if (!ent->sense_ptr) {
 		esp_log_autosense("Doing auto-sense for tgt[%d] lun[%d]\n",
 				  tgt, lun);
-
-		ent->sense_ptr = cmd->sense_buffer;
-		ent->sense_dma = esp->ops->map_single(esp,
-						      ent->sense_ptr,
-						      SCSI_SENSE_BUFFERSIZE,
-						      DMA_FROM_DEVICE);
+		esp_map_sense(esp, ent);
 	}
 	ent->saved_sense_ptr = ent->sense_ptr;
 
@@ -717,10 +725,10 @@ static struct esp_cmd_entry *find_and_prep_issuable_command(struct esp *esp)
 static void esp_maybe_execute_command(struct esp *esp)
 {
 	struct esp_target_data *tp;
-	struct esp_lun_data *lp;
 	struct scsi_device *dev;
 	struct scsi_cmnd *cmd;
 	struct esp_cmd_entry *ent;
+	bool select_and_stop = false;
 	int tgt, lun, i;
 	u32 val, start_cmd;
 	u8 *p;
@@ -743,7 +751,6 @@ static void esp_maybe_execute_command(struct esp *esp)
 	tgt = dev->id;
 	lun = dev->lun;
 	tp = &esp->target[tgt];
-	lp = dev->hostdata;
 
 	list_move(&ent->list, &esp->active_cmds);
 
@@ -752,7 +759,8 @@ static void esp_maybe_execute_command(struct esp *esp)
 	esp_map_dma(esp, cmd);
 	esp_save_pointers(esp, ent);
 
-	esp_check_command_len(esp, cmd);
+	if (!(cmd->cmd_len == 6 || cmd->cmd_len == 10 || cmd->cmd_len == 12))
+		select_and_stop = true;
 
 	p = esp->command_block;
 
@@ -793,42 +801,22 @@ static void esp_maybe_execute_command(struct esp *esp)
 			tp->flags &= ~ESP_TGT_CHECK_NEGO;
 		}
 
-		/* Process it like a slow command.  */
-		if (tp->flags & (ESP_TGT_NEGO_WIDE | ESP_TGT_NEGO_SYNC))
-			esp->flags |= ESP_FLAG_DOING_SLOWCMD;
+		/* If there are multiple message bytes, use Select and Stop */
+		if (esp->msg_out_len)
+			select_and_stop = true;
 	}
 
 build_identify:
-	/* If we don't have a lun-data struct yet, we're probing
-	 * so do not disconnect.  Also, do not disconnect unless
-	 * we have a tag on this command.
-	 */
-	if (lp && (tp->flags & ESP_TGT_DISCONNECT) && ent->tag[0])
-		*p++ = IDENTIFY(1, lun);
-	else
-		*p++ = IDENTIFY(0, lun);
+	*p++ = IDENTIFY(tp->flags & ESP_TGT_DISCONNECT, lun);
 
 	if (ent->tag[0] && esp->rev == ESP100) {
 		/* ESP100 lacks select w/atn3 command, use select
 		 * and stop instead.
 		 */
-		esp->flags |= ESP_FLAG_DOING_SLOWCMD;
+		select_and_stop = true;
 	}
 
-	if (!(esp->flags & ESP_FLAG_DOING_SLOWCMD)) {
-		start_cmd = ESP_CMD_SELA;
-		if (ent->tag[0]) {
-			*p++ = ent->tag[0];
-			*p++ = ent->tag[1];
-
-			start_cmd = ESP_CMD_SA3;
-		}
-
-		for (i = 0; i < cmd->cmd_len; i++)
-			*p++ = cmd->cmnd[i];
-
-		esp->select_state = ESP_SELECT_BASIC;
-	} else {
+	if (select_and_stop) {
 		esp->cmd_bytes_left = cmd->cmd_len;
 		esp->cmd_bytes_ptr = &cmd->cmnd[0];
 
@@ -843,6 +831,19 @@ build_identify:
 
 		start_cmd = ESP_CMD_SELAS;
 		esp->select_state = ESP_SELECT_MSGOUT;
+	} else {
+		start_cmd = ESP_CMD_SELA;
+		if (ent->tag[0]) {
+			*p++ = ent->tag[0];
+			*p++ = ent->tag[1];
+
+			start_cmd = ESP_CMD_SA3;
+		}
+
+		for (i = 0; i < cmd->cmd_len; i++)
+			*p++ = cmd->cmnd[i];
+
+		esp->select_state = ESP_SELECT_BASIC;
 	}
 	val = tgt;
 	if (esp->rev == FASHME)
@@ -902,9 +903,7 @@ static void esp_cmd_is_done(struct esp *esp, struct esp_cmd_entry *ent,
 	}
 
 	if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
-		esp->ops->unmap_single(esp, ent->sense_dma,
-				       SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
-		ent->sense_ptr = NULL;
+		esp_unmap_sense(esp, ent);
 
 		/* Restore the message/status bytes to what we actually
 		 * saw originally.  Also, report that we are providing
@@ -965,7 +964,7 @@ static int esp_queuecommand_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_
 	cmd->scsi_done = done;
 
 	spriv = ESP_CMD_PRIV(cmd);
-	spriv->u.dma_addr = ~(dma_addr_t)0x0;
+	spriv->num_sg = 0;
 
 	list_add_tail(&ent->list, &esp->queued_cmds);
 
@@ -1252,14 +1251,10 @@ static int esp_finish_select(struct esp *esp)
 			esp_unmap_dma(esp, cmd);
 			esp_free_lun_tag(ent, cmd->device->hostdata);
 			tp->flags &= ~(ESP_TGT_NEGO_SYNC | ESP_TGT_NEGO_WIDE);
-			esp->flags &= ~ESP_FLAG_DOING_SLOWCMD;
 			esp->cmd_bytes_ptr = NULL;
 			esp->cmd_bytes_left = 0;
 		} else {
-			esp->ops->unmap_single(esp, ent->sense_dma,
-					       SCSI_SENSE_BUFFERSIZE,
-					       DMA_FROM_DEVICE);
-			ent->sense_ptr = NULL;
+			esp_unmap_sense(esp, ent);
 		}
 
 		/* Now that the state is unwound properly, put back onto
@@ -1303,9 +1298,8 @@ static int esp_finish_select(struct esp *esp)
 				esp_flush_fifo(esp);
 		}
 
-		/* If we are doing a slow command, negotiation, etc.
-		 * we'll do the right thing as we transition to the
-		 * next phase.
+		/* If we are doing a Select And Stop command, negotiation, etc.
+		 * we'll do the right thing as we transition to the next phase.
 		 */
 		esp_event(esp, ESP_EVENT_CHECK_PHASE);
 		return 0;
@@ -1338,6 +1332,7 @@ static int esp_data_bytes_sent(struct esp *esp, struct esp_cmd_entry *ent,
 
 	bytes_sent = esp->data_dma_len;
 	bytes_sent -= ecount;
+	bytes_sent -= esp->send_cmd_residual;
 
 	/*
 	 * The am53c974 has a DMA 'pecularity'. The doc states:
@@ -1358,7 +1353,7 @@ static int esp_data_bytes_sent(struct esp *esp, struct esp_cmd_entry *ent,
 			struct esp_cmd_priv *p = ESP_CMD_PRIV(cmd);
 			u8 *ptr;
 
-			ptr = scsi_kmap_atomic_sg(p->cur_sg, p->u.num_sg,
+			ptr = scsi_kmap_atomic_sg(p->cur_sg, p->num_sg,
 						  &offset, &count);
 			if (likely(ptr)) {
 				*(ptr + offset) = bval;
@@ -2039,11 +2034,8 @@ static void esp_reset_cleanup_one(struct esp *esp, struct esp_cmd_entry *ent)
 	esp_free_lun_tag(ent, cmd->device->hostdata);
 	cmd->result = DID_RESET << 16;
 
-	if (ent->flags & ESP_CMD_FLAG_AUTOSENSE) {
-		esp->ops->unmap_single(esp, ent->sense_dma,
-				       SCSI_SENSE_BUFFERSIZE, DMA_FROM_DEVICE);
-		ent->sense_ptr = NULL;
-	}
+	if (ent->flags & ESP_CMD_FLAG_AUTOSENSE)
+		esp_unmap_sense(esp, ent);
 
 	cmd->scsi_done(cmd);
 	list_del(&ent->list);
@@ -2382,7 +2374,7 @@ static const char *esp_chip_names[] = {
 
 static struct scsi_transport_template *esp_transport_template;
 
-int scsi_esp_register(struct esp *esp, struct device *dev)
+int scsi_esp_register(struct esp *esp)
 {
 	static int instance;
 	int err;
@@ -2402,10 +2394,10 @@ int scsi_esp_register(struct esp *esp, struct device *dev)
 
 	esp_bootup_reset(esp);
 
-	dev_printk(KERN_INFO, dev, "esp%u: regs[%1p:%1p] irq[%u]\n",
+	dev_printk(KERN_INFO, esp->dev, "esp%u: regs[%1p:%1p] irq[%u]\n",
 		   esp->host->unique_id, esp->regs, esp->dma_regs,
 		   esp->host->irq);
-	dev_printk(KERN_INFO, dev,
+	dev_printk(KERN_INFO, esp->dev,
 		   "esp%u: is a %s, %u MHz (ccf=%u), SCSI ID %u\n",
 		   esp->host->unique_id, esp_chip_names[esp->rev],
 		   esp->cfreq / 1000000, esp->cfact, esp->scsi_id);
@@ -2413,7 +2405,7 @@ int scsi_esp_register(struct esp *esp, struct device *dev)
 	/* Let the SCSI bus reset settle. */
 	ssleep(esp_bus_reset_settle);
 
-	err = scsi_add_host(esp->host, dev);
+	err = scsi_add_host(esp->host, esp->dev);
 	if (err)
 		return err;
 
@@ -2790,3 +2782,131 @@ MODULE_PARM_DESC(esp_debug,
 
 module_init(esp_init);
 module_exit(esp_exit);
+
+#ifdef CONFIG_SCSI_ESP_PIO
+static inline unsigned int esp_wait_for_fifo(struct esp *esp)
+{
+	int i = 500000;
+
+	do {
+		unsigned int fbytes = esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES;
+
+		if (fbytes)
+			return fbytes;
+
+		udelay(1);
+	} while (--i);
+
+	shost_printk(KERN_ERR, esp->host, "FIFO is empty. sreg [%02x]\n",
+		     esp_read8(ESP_STATUS));
+	return 0;
+}
+
+static inline int esp_wait_for_intr(struct esp *esp)
+{
+	int i = 500000;
+
+	do {
+		esp->sreg = esp_read8(ESP_STATUS);
+		if (esp->sreg & ESP_STAT_INTR)
+			return 0;
+
+		udelay(1);
+	} while (--i);
+
+	shost_printk(KERN_ERR, esp->host, "IRQ timeout. sreg [%02x]\n",
+		     esp->sreg);
+	return 1;
+}
+
+#define ESP_FIFO_SIZE 16
+
+void esp_send_pio_cmd(struct esp *esp, u32 addr, u32 esp_count,
+		      u32 dma_count, int write, u8 cmd)
+{
+	u8 phase = esp->sreg & ESP_STAT_PMASK;
+
+	cmd &= ~ESP_CMD_DMA;
+	esp->send_cmd_error = 0;
+
+	if (write) {
+		u8 *dst = (u8 *)addr;
+		u8 mask = ~(phase == ESP_MIP ? ESP_INTR_FDONE : ESP_INTR_BSERV);
+
+		scsi_esp_cmd(esp, cmd);
+
+		while (1) {
+			if (!esp_wait_for_fifo(esp))
+				break;
+
+			*dst++ = readb(esp->fifo_reg);
+			--esp_count;
+
+			if (!esp_count)
+				break;
+
+			if (esp_wait_for_intr(esp)) {
+				esp->send_cmd_error = 1;
+				break;
+			}
+
+			if ((esp->sreg & ESP_STAT_PMASK) != phase)
+				break;
+
+			esp->ireg = esp_read8(ESP_INTRPT);
+			if (esp->ireg & mask) {
+				esp->send_cmd_error = 1;
+				break;
+			}
+
+			if (phase == ESP_MIP)
+				esp_write8(ESP_CMD_MOK, ESP_CMD);
+
+			esp_write8(ESP_CMD_TI, ESP_CMD);
+		}
+	} else {
+		unsigned int n = ESP_FIFO_SIZE;
+		u8 *src = (u8 *)addr;
+
+		scsi_esp_cmd(esp, ESP_CMD_FLUSH);
+
+		if (n > esp_count)
+			n = esp_count;
+		writesb(esp->fifo_reg, src, n);
+		src += n;
+		esp_count -= n;
+
+		scsi_esp_cmd(esp, cmd);
+
+		while (esp_count) {
+			if (esp_wait_for_intr(esp)) {
+				esp->send_cmd_error = 1;
+				break;
+			}
+
+			if ((esp->sreg & ESP_STAT_PMASK) != phase)
+				break;
+
+			esp->ireg = esp_read8(ESP_INTRPT);
+			if (esp->ireg & ~ESP_INTR_BSERV) {
+				esp->send_cmd_error = 1;
+				break;
+			}
+
+			n = ESP_FIFO_SIZE -
+			    (esp_read8(ESP_FFLAGS) & ESP_FF_FBYTES);
+
+			if (n > esp_count)
+				n = esp_count;
+			writesb(esp->fifo_reg, src, n);
+			src += n;
+			esp_count -= n;
+
+			esp_write8(ESP_CMD_TI, ESP_CMD);
+		}
+	}
+
+	esp->send_cmd_residual = esp_count;
+}
+EXPORT_SYMBOL(esp_send_pio_cmd);
+#endif