[SCSI] megaraid_sas: new template defined to represent each type of controllers

This patch defines a new template to represent each type of
controllers (identified by the processor used). The template has
members that is set with appropriate values during driver
initialisation. This change is done to support new controllers with
minimal change to existing code. In future, for a new controller
support, a template will be declared and its members initialised
appropriately.
Signed-off-by: Sumant Patro <Sumant.Patro@lsil.com>

Rejections fixed and
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

Documentation/scsi/ChangeLog.megaraid_sas

+1 Release Date    : Mon Jan 23 14:09:01 PST 2006 - Sumant Patro <Sumant.Patro@lsil.com>
+2 Current Version : 00.00.02.02
+3 Older Version   : 00.00.02.01 
+
+i.	New template defined to represent each family of controllers (identified by processor used). 
+	The template will have defintions that will be initialised to appropritae values for a specific family of controllers. The template definition has four function pointers. During driver initialisation the function pointers will be set based on the controller family type. This change is done to support new controllers that has different processors and thus different register set.
+
+		-Sumant Patro <Sumant.Patro@lsil.com>
+
 1 Release Date    : Mon Dec 19 14:36:26 PST 2005 - Sumant Patro <Sumant.Patro@lsil.com>
 2 Current Version : 00.00.02.00-rc4 
 3 Older Version   : 00.00.02.01 

drivers/scsi/megaraid/megaraid_sas.c

@@ -10,7 +10,7 @@
  *	   2 of the License, or (at your option) any later version.
  *
  * FILE		: megaraid_sas.c
- * Version	: v00.00.02.01
+ * Version	: v00.00.02.02
  *
  * Authors:
  * 	Sreenivas Bagalkote	<Sreenivas.Bagalkote@lsil.com>
@@ -55,13 +55,13 @@ static struct pci_device_id megasas_pci_table[] = {
 
 	{
 	 PCI_VENDOR_ID_LSI_LOGIC,
-	 PCI_DEVICE_ID_LSI_SAS1064R,
+	 PCI_DEVICE_ID_LSI_SAS1064R, // xscale IOP
 	 PCI_ANY_ID,
 	 PCI_ANY_ID,
 	 },
 	{
 	 PCI_VENDOR_ID_DELL,
-	 PCI_DEVICE_ID_DELL_PERC5,
+	 PCI_DEVICE_ID_DELL_PERC5, // xscale IOP
 	 PCI_ANY_ID,
 	 PCI_ANY_ID,
 	 },
@@ -119,12 +119,18 @@ megasas_return_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd)
 	spin_unlock_irqrestore(&instance->cmd_pool_lock, flags);
 }
 
+
+/**
+*	The following functions are defined for xscale 
+*	(deviceid : 1064R, PERC5) controllers
+*/
+
 /**
- * megasas_enable_intr -	Enables interrupts
+ * megasas_enable_intr_xscale -	Enables interrupts
  * @regs:			MFI register set
  */
 static inline void
-megasas_enable_intr(struct megasas_register_set __iomem * regs)
+megasas_enable_intr_xscale(struct megasas_register_set __iomem * regs)
 {
 	writel(1, &(regs)->outbound_intr_mask);
 
@@ -132,6 +138,66 @@ megasas_enable_intr(struct megasas_register_set __iomem * regs)
 	readl(&regs->outbound_intr_mask);
 }
 
+/**
+ * megasas_read_fw_status_reg_xscale - returns the current FW status value
+ * @regs:			MFI register set
+ */
+static u32
+megasas_read_fw_status_reg_xscale(struct megasas_register_set __iomem * regs)
+{
+	return readl(&(regs)->outbound_msg_0);
+}
+/**
+ * megasas_clear_interrupt_xscale -	Check & clear interrupt
+ * @regs:				MFI register set
+ */
+static int 
+megasas_clear_intr_xscale(struct megasas_register_set __iomem * regs)
+{
+	u32 status;
+	/*
+	 * Check if it is our interrupt
+	 */
+	status = readl(&regs->outbound_intr_status);
+
+	if (!(status & MFI_OB_INTR_STATUS_MASK)) {
+		return 1;
+	}
+
+	/*
+	 * Clear the interrupt by writing back the same value
+	 */
+	writel(status, &regs->outbound_intr_status);
+
+	return 0;
+}
+
+/**
+ * megasas_fire_cmd_xscale -	Sends command to the FW
+ * @frame_phys_addr :		Physical address of cmd
+ * @frame_count :		Number of frames for the command
+ * @regs :			MFI register set
+ */
+static inline void 
+megasas_fire_cmd_xscale(dma_addr_t frame_phys_addr,u32 frame_count, struct megasas_register_set __iomem *regs)
+{
+	writel((frame_phys_addr >> 3)|(frame_count),
+	       &(regs)->inbound_queue_port);
+}
+
+static struct megasas_instance_template megasas_instance_template_xscale = {
+
+	.fire_cmd = megasas_fire_cmd_xscale,
+	.enable_intr = megasas_enable_intr_xscale,
+	.clear_intr = megasas_clear_intr_xscale,
+	.read_fw_status_reg = megasas_read_fw_status_reg_xscale,
+};
+
+/**
+*	This is the end of set of functions & definitions specific 
+*	to xscale (deviceid : 1064R, PERC5) controllers
+*/
+
 /**
  * megasas_disable_intr -	Disables interrupts
  * @regs:			MFI register set
@@ -139,7 +205,7 @@ megasas_enable_intr(struct megasas_register_set __iomem * regs)
 static inline void
 megasas_disable_intr(struct megasas_register_set __iomem * regs)
 {
-	u32 mask = readl(&regs->outbound_intr_mask) & (~0x00000001);
+	u32 mask = 0x1f; 
 	writel(mask, &regs->outbound_intr_mask);
 
 	/* Dummy readl to force pci flush */
@@ -167,8 +233,7 @@ megasas_issue_polled(struct megasas_instance *instance, struct megasas_cmd *cmd)
 	/*
 	 * Issue the frame using inbound queue port
 	 */
-	writel(cmd->frame_phys_addr >> 3,
-	       &instance->reg_set->inbound_queue_port);
+	instance->instancet->fire_cmd(cmd->frame_phys_addr ,0,instance->reg_set);
 
 	/*
 	 * Wait for cmd_status to change
@@ -198,8 +263,7 @@ megasas_issue_blocked_cmd(struct megasas_instance *instance,
 {
 	cmd->cmd_status = ENODATA;
 
-	writel(cmd->frame_phys_addr >> 3,
-	       &instance->reg_set->inbound_queue_port);
+	instance->instancet->fire_cmd(cmd->frame_phys_addr ,0,instance->reg_set);
 
 	wait_event(instance->int_cmd_wait_q, (cmd->cmd_status != ENODATA));
 
@@ -242,8 +306,7 @@ megasas_issue_blocked_abort_cmd(struct megasas_instance *instance,
 	cmd->sync_cmd = 1;
 	cmd->cmd_status = 0xFF;
 
-	writel(cmd->frame_phys_addr >> 3,
-	       &instance->reg_set->inbound_queue_port);
+	instance->instancet->fire_cmd(cmd->frame_phys_addr ,0,instance->reg_set);
 
 	/*
 	 * Wait for this cmd to complete
@@ -633,8 +696,7 @@ megasas_queue_command(struct scsi_cmnd *scmd, void (*done) (struct scsi_cmnd *))
 	instance->fw_outstanding++;
 	spin_unlock_irqrestore(&instance->instance_lock, flags);
 
-	writel(((cmd->frame_phys_addr >> 3) | (cmd->frame_count - 1)),
-	       &instance->reg_set->inbound_queue_port);
+	instance->instancet->fire_cmd(cmd->frame_phys_addr ,cmd->frame_count-1,instance->reg_set);
 
 	return 0;
 
@@ -1045,7 +1107,6 @@ megasas_complete_cmd(struct megasas_instance *instance, struct megasas_cmd *cmd,
 static int
 megasas_deplete_reply_queue(struct megasas_instance *instance, u8 alt_status)
 {
-	u32 status;
 	u32 producer;
 	u32 consumer;
 	u32 context;
@@ -1053,17 +1114,10 @@ megasas_deplete_reply_queue(struct megasas_instance *instance, u8 alt_status)
 
 	/*
 	 * Check if it is our interrupt
+	 * Clear the interrupt 
 	 */
-	status = readl(&instance->reg_set->outbound_intr_status);
-
-	if (!(status & MFI_OB_INTR_STATUS_MASK)) {
+	if(instance->instancet->clear_intr(instance->reg_set))
 		return IRQ_NONE;
-	}
-
-	/*
-	 * Clear the interrupt by writing back the same value
-	 */
-	writel(status, &instance->reg_set->outbound_intr_status);
 
 	producer = *instance->producer;
 	consumer = *instance->consumer;
@@ -1097,7 +1151,7 @@ static irqreturn_t megasas_isr(int irq, void *devp, struct pt_regs *regs)
 
 /**
  * megasas_transition_to_ready -	Move the FW to READY state
- * @reg_set:				MFI register set
+ * @instance:				Adapter soft state
  *
  * During the initialization, FW passes can potentially be in any one of
  * several possible states. If the FW in operational, waiting-for-handshake
@@ -1105,14 +1159,14 @@ static irqreturn_t megasas_isr(int irq, void *devp, struct pt_regs *regs)
  * has to wait for the ready state.
  */
 static int
-megasas_transition_to_ready(struct megasas_register_set __iomem * reg_set)
+megasas_transition_to_ready(struct megasas_instance* instance)
 {
 	int i;
 	u8 max_wait;
 	u32 fw_state;
 	u32 cur_state;
 
-	fw_state = readl(&reg_set->outbound_msg_0) & MFI_STATE_MASK;
+	fw_state = instance->instancet->read_fw_status_reg(instance->reg_set) & MFI_STATE_MASK;
 
 	while (fw_state != MFI_STATE_READY) {
 
@@ -1130,7 +1184,7 @@ megasas_transition_to_ready(struct megasas_register_set __iomem * reg_set)
 			 * Set the CLR bit in inbound doorbell
 			 */
 			writel(MFI_INIT_CLEAR_HANDSHAKE,
-			       &reg_set->inbound_doorbell);
+				&instance->reg_set->inbound_doorbell);
 
 			max_wait = 2;
 			cur_state = MFI_STATE_WAIT_HANDSHAKE;
@@ -1140,8 +1194,8 @@ megasas_transition_to_ready(struct megasas_register_set __iomem * reg_set)
 			/*
 			 * Bring it to READY state; assuming max wait 2 secs
 			 */
-			megasas_disable_intr(reg_set);
-			writel(MFI_INIT_READY, &reg_set->inbound_doorbell);
+			megasas_disable_intr(instance->reg_set);
+			writel(MFI_INIT_READY, &instance->reg_set->inbound_doorbell);
 
 			max_wait = 10;
 			cur_state = MFI_STATE_OPERATIONAL;
@@ -1190,8 +1244,8 @@ megasas_transition_to_ready(struct megasas_register_set __iomem * reg_set)
 		 * The cur_state should not last for more than max_wait secs
 		 */
 		for (i = 0; i < (max_wait * 1000); i++) {
-			fw_state = MFI_STATE_MASK &
-			    readl(&reg_set->outbound_msg_0);
+			fw_state = instance->instancet->read_fw_status_reg(instance->reg_set) &  
+					MFI_STATE_MASK ;
 
 			if (fw_state == cur_state) {
 				msleep(1);
@@ -1553,17 +1607,19 @@ static int megasas_init_mfi(struct megasas_instance *instance)
 
 	reg_set = instance->reg_set;
 
+	instance->instancet = &megasas_instance_template_xscale;
+
 	/*
 	 * We expect the FW state to be READY
 	 */
-	if (megasas_transition_to_ready(instance->reg_set))
+	if (megasas_transition_to_ready(instance))
 		goto fail_ready_state;
 
 	/*
 	 * Get various operational parameters from status register
 	 */
-	instance->max_fw_cmds = readl(&reg_set->outbound_msg_0) & 0x00FFFF;
-	instance->max_num_sge = (readl(&reg_set->outbound_msg_0) & 0xFF0000) >>
+	instance->max_fw_cmds = instance->instancet->read_fw_status_reg(reg_set) & 0x00FFFF;
+	instance->max_num_sge = (instance->instancet->read_fw_status_reg(reg_set) & 0xFF0000) >> 
 					0x10;
 	/*
 	 * Create a pool of commands
@@ -1873,8 +1929,7 @@ megasas_register_aen(struct megasas_instance *instance, u32 seq_num,
 	/*
 	 * Issue the aen registration frame
 	 */
-	writel(cmd->frame_phys_addr >> 3,
-	       &instance->reg_set->inbound_queue_port);
+	instance->instancet->fire_cmd(cmd->frame_phys_addr ,0,instance->reg_set);
 
 	return 0;
 }
@@ -2063,7 +2118,7 @@ megasas_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
 		goto fail_irq;
 	}
 
-	megasas_enable_intr(instance->reg_set);
+	instance->instancet->enable_intr(instance->reg_set);
 
 	/*
 	 * Store instance in PCI softstate

drivers/scsi/megaraid/megaraid_sas.h

@@ -18,9 +18,9 @@
 /**
  * MegaRAID SAS Driver meta data
  */
-#define MEGASAS_VERSION				"00.00.02.01"
-#define MEGASAS_RELDATE				"Dec 19, 2005"
-#define MEGASAS_EXT_VERSION			"Mon Dec 19 14:36:26 PST 2005"
+#define MEGASAS_VERSION				"00.00.02.02"
+#define MEGASAS_RELDATE				"Jan 23, 2006"
+#define MEGASAS_EXT_VERSION			"Mon Jan 23 14:09:01 PST 2006"
 /*
  * =====================================
  * MegaRAID SAS MFI firmware definitions
@@ -1012,6 +1012,16 @@ struct megasas_evt_detail {
 
 } __attribute__ ((packed));
 
+ struct megasas_instance_template {
+	void (*fire_cmd)(dma_addr_t ,u32 ,struct megasas_register_set __iomem *);
+
+	void (*enable_intr)(struct megasas_register_set __iomem *) ;
+
+	int (*clear_intr)(struct megasas_register_set __iomem *);
+
+	u32 (*read_fw_status_reg)(struct megasas_register_set __iomem *);
+ };
+
 struct megasas_instance {
 
 	u32 *producer;
@@ -1055,6 +1065,8 @@ struct megasas_instance {
 	u32 fw_outstanding;
 	u32 hw_crit_error;
 	spinlock_t instance_lock;
+
+	struct megasas_instance_template *instancet;
 };
 
 #define MEGASAS_IS_LOGICAL(scp)						\