[PATCH] I2O: Adaptec specific SG_IO access, firmware access through sysfs and 2400A workaround

Changes:
 - Provide SG_IO access to BLOCK and EXECUTIVE class on Adaptec
   controllers
 - Use PRIVATE messages in SCSI-OSM because on some controllers normal
   SCSI class commands like READ or READ CAPACITY cause errors
 - Use new DMA and SG list creation function
 - Added workaround to limit sectors per request for Adaptec 2400A
   controllers

Signed-off-by: Markus Lidel <Markus.Lidel@shadowconnect.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 74 insertions, 11 deletions

diff --git a/include/linux/i2o-dev.h b/include/linux/i2o-dev.h
index 90c984ecd521..d4a08d29e36d 100644
--- a/include/linux/i2o-dev.h
+++ b/include/linux/i2o-dev.h
@@ -33,6 +33,13 @@ typedef unsigned int u32;
 #endif				/* __KERNEL__ */
 
 /*
+ *	Software module types
+ */
+#define I2O_SOFTWARE_MODULE_IRTOS		0x11
+#define I2O_SOFTWARE_MODULE_IOP_PRIVATE		0x22
+#define I2O_SOFTWARE_MODULE_IOP_CONFIG		0x23
+
+/*
  *	Vendors
  */
 #define I2O_VENDOR_DPT				0x001b
@@ -125,6 +132,10 @@ struct i2o_evt_get {
 	int lost;
 };
 
+typedef struct i2o_sg_io_hdr {
+	unsigned int flags;	/* see I2O_DPT_SG_IO_FLAGS */
+} i2o_sg_io_hdr_t;
+
 /**************************************************************************
  * HRT related constants and structures
  **************************************************************************/
@@ -403,4 +414,15 @@ typedef struct _i2o_status_block {
 #define ADAPTER_STATE_FAILED			0x10
 #define ADAPTER_STATE_FAULTED			0x11
 
+
+/*
+ * DPT / Adaptec specific values for i2o_sg_io_hdr flags.
+ */
+#define I2O_DPT_SG_FLAG_INTERPRET		0x00010000
+#define I2O_DPT_SG_FLAG_PHYSICAL		0x00020000
+
+#define I2O_DPT_FLASH_FRAG_SIZE			0x10000
+#define I2O_DPT_FLASH_READ			0x0101
+#define I2O_DPT_FLASH_WRITE			0x0102
+
 #endif				/* _I2O_DEV_H */
diff --git a/include/linux/i2o.h b/include/linux/i2o.h
index 497ea574f96b..2039a87c2b91 100644
--- a/include/linux/i2o.h
+++ b/include/linux/i2o.h
@@ -147,10 +147,13 @@ struct i2o_controller {
 
 	struct pci_dev *pdev;	/* PCI device */
 
-	unsigned int short_req:1;	/* use small block sizes */
-	unsigned int no_quiesce:1;	/* dont quiesce before reset */
-	unsigned int raptor:1;		/* split bar */
 	unsigned int promise:1;		/* Promise controller */
+	unsigned int adaptec:1;		/* DPT / Adaptec controller */
+	unsigned int raptor:1;	/* split bar */
+	unsigned int no_quiesce:1;	/* dont quiesce before reset */
+	unsigned int short_req:1;	/* use small block sizes */
+	unsigned int limit_sectors:1;	/* limit number of sectors / request */
+	unsigned int pae_support:1;	/* controller has 64-bit SGL support */
 
 	struct list_head devices;	/* list of I2O devices */
 	struct list_head list;	/* Controller list */
@@ -746,7 +749,21 @@ static inline struct i2o_message __iomem *i2o_msg_in_to_virt(struct i2o_controll
 static inline int i2o_dma_alloc(struct device *dev, struct i2o_dma *addr,
 				size_t len, unsigned int gfp_mask)
 {
+	struct pci_dev *pdev = to_pci_dev(dev);
+	int dma_64 = 0;
+
+	if ((sizeof(dma_addr_t) > 4) && (pdev->dma_mask == DMA_64BIT_MASK)) {
+			dma_64 = 1;
+			if(pci_set_dma_mask(pdev, DMA_32BIT_MASK))
+				return -ENOMEM;
+	}
+
 	addr->virt = dma_alloc_coherent(dev, len, &addr->phys, gfp_mask);
+
+	if ((sizeof(dma_addr_t) > 4) && dma_64)
+		if(pci_set_dma_mask(pdev, DMA_64BIT_MASK))
+			printk(KERN_WARNING "i2o: unable to set 64-bit DMA");
+
 	if (!addr->virt)
 		return -ENOMEM;
 
@@ -946,7 +963,7 @@ extern void i2o_debug_state(struct i2o_controller *c);
 #define I2O_CMD_BLOCK_MEJECT		0x43
 #define I2O_CMD_BLOCK_POWER		0x70
 
-#define I2O_PRIVATE_MSG			0xFF
+#define I2O_CMD_PRIVATE			0xFF
 
 /* Command status values  */
 
@@ -1095,9 +1112,9 @@ extern void i2o_debug_state(struct i2o_controller *c);
 #define SGL_OFFSET_8    (0x0080 | I2OVERSION)
 #define SGL_OFFSET_9    (0x0090 | I2OVERSION)
 #define SGL_OFFSET_10   (0x00A0 | I2OVERSION)
-
-#define TRL_OFFSET_5    (0x0050 | I2OVERSION)
-#define TRL_OFFSET_6    (0x0060 | I2OVERSION)
+#define SGL_OFFSET_11   (0x00B0 | I2OVERSION)
+#define SGL_OFFSET_12   (0x00C0 | I2OVERSION)
+#define SGL_OFFSET(x)   (((x)<<4) | I2OVERSION)
 
 /* Transaction Reply Lists (TRL) Control Word structure */
 #define TRL_SINGLE_FIXED_LENGTH		0x00
@@ -1130,7 +1147,6 @@ extern void i2o_debug_state(struct i2o_controller *c);
 #define HOST_TID		1
 
 #define MSG_FRAME_SIZE		128	/* i2o_scsi assumes >= 32 */
-#define REPLY_FRAME_SIZE	17
 #define SG_TABLESIZE		30
 #define NMBR_MSG_FRAMES		128
 
@@ -1155,11 +1171,10 @@ extern void i2o_debug_state(struct i2o_controller *c);
 #define I2O_HRT_GET_TRIES		3
 #define I2O_LCT_GET_TRIES		3
 
-/* request queue sizes */
+/* defines for max_sectors and max_phys_segments */
 #define I2O_MAX_SECTORS			1024
+#define I2O_MAX_SECTORS_LIMITED		256
 #define I2O_MAX_PHYS_SEGMENTS		MAX_PHYS_SEGMENTS
 
-#define I2O_REQ_MEMPOOL_SIZE		32
-
 #endif				/* __KERNEL__ */
 #endif				/* _I2O_H */
diff --git a/include/scsi/sg_request.h b/include/scsi/sg_request.h
new file mode 100644
index 000000000000..57ff525bdd3b
--- /dev/null
+++ b/include/scsi/sg_request.h
@@ -0,0 +1,26 @@
+typedef struct scsi_request Scsi_Request;
+
+static Scsi_Request *dummy_cmdp;	/* only used for sizeof */
+
+typedef struct sg_scatter_hold { /* holding area for scsi scatter gather info */
+	unsigned short k_use_sg; /* Count of kernel scatter-gather pieces */
+	unsigned short sglist_len; /* size of malloc'd scatter-gather list ++ */
+	unsigned bufflen;	/* Size of (aggregate) data buffer */
+	unsigned b_malloc_len;	/* actual len malloc'ed in buffer */
+	void *buffer;		/* Data buffer or scatter list (k_use_sg>0) */
+	char dio_in_use;	/* 0->indirect IO (or mmap), 1->dio */
+	unsigned char cmd_opcode; /* first byte of command */
+} Sg_scatter_hold;
+
+typedef struct sg_request {	/* SG_MAX_QUEUE requests outstanding per file */
+	Scsi_Request *my_cmdp;	/* != 0  when request with lower levels */
+	struct sg_request *nextrp;	/* NULL -> tail request (slist) */
+	struct sg_fd *parentfp;	/* NULL -> not in use */
+	Sg_scatter_hold data;	/* hold buffer, perhaps scatter list */
+	sg_io_hdr_t header;	/* scsi command+info, see <scsi/sg.h> */
+	unsigned char sense_b[sizeof (dummy_cmdp->sr_sense_buffer)];
+	char res_used;		/* 1 -> using reserve buffer, 0 -> not ... */
+	char orphan;		/* 1 -> drop on sight, 0 -> normal */
+	char sg_io_owned;	/* 1 -> packet belongs to SG_IO */
+	volatile char done;	/* 0->before bh, 1->before read, 2->read */
+} Sg_request;