io_ti.c

该文件是rt_linux

			    port->uart_base + UMPMEM_OFFS_UART_LSR,
			    1,
			    &lsr);

	if (status)
		goto exit_is_tx_active;
	dbg ("%s - LSR = 0x%X", __FUNCTION__, lsr);
	
	/* If either buffer has data or we are transmitting then return TRUE */
	if ((oedb->XByteCount & 0x80 ) != 0 )
		bytes_left += 64;

	if ((lsr & UMP_UART_LSR_TX_MASK ) == 0 )
		bytes_left += 1;

	/* We return Not Active if we get any kind of error */
exit_is_tx_active:
	dbg ("%s - return %d", __FUNCTION__, bytes_left );
	return bytes_left;
}

static void TIChasePort(struct edgeport_port *port)
{
	int loops;
	int last_count;
	int write_size;

restart_tx_loop:
	// Base the LoopTime on the baud rate
	if (port->baud_rate == 0)
		port->baud_rate = 1200;

	write_size = port->tx.count;
	loops = max(100, (100*write_size)/(port->baud_rate/10));
	dbg ("%s - write_size %d, baud %d loop = %d", __FUNCTION__,
	     write_size, port->baud_rate, loops);

	while (1) {
		// Save Last count
		last_count = port->tx.count;

		dbg ("%s - Tx Buffer Size = %d loops = %d", __FUNCTION__,
		     last_count, loops);

		/* Is the Edgeport Buffer empty? */
		if (port->tx.count == 0)
			break;

		/* Block the thread for 10ms */
		wait_ms (10);

		if (last_count == port->tx.count) {
			/* No activity.. count down. */
			--loops;
			if (loops == 0) {
				dbg ("%s - Wait for TxEmpty - TIMEOUT",
				     __FUNCTION__);
				return;
			}
		} else {
			/* Reset timeout value back to a minimum of 1 second */
			dbg ("%s - Wait for TxEmpty  Reset Count", __FUNCTION__);
			goto restart_tx_loop;
		}
	}

	dbg ("%s - Local Tx Buffer Empty -- Waiting for TI UMP to EMPTY X/Y and FIFO",
	     __FUNCTION__);

	write_size = TIIsTxActive (port);
	loops = max(50, (100*write_size)/(port->baud_rate/10));
	dbg ("%s - write_size %d, baud %d loop = %d", __FUNCTION__, 
	     write_size, port->baud_rate, loops);

	while (1) {
		/* This function takes 4 ms; */
		if (!TIIsTxActive (port)) {
			/* Delay a few char times */
			wait_ms (50);
			dbg ("%s - Empty", __FUNCTION__);
			return;
		}

		--loops;
		if (loops == 0) {
			dbg ("%s - TIMEOUT", __FUNCTION__);
			return;
		}
	}
}

static int TIChooseConfiguration (struct usb_device *dev)
{
	// There may be multiple configurations on this device, in which case
	// we would need to read and parse all of them to find out which one
	// we want. However, we just support one config at this point,
	// configuration # 1, which is Config Descriptor 0.

	dbg ("%s - Number of Interfaces = %d", __FUNCTION__, dev->config->bNumInterfaces);
	dbg ("%s - MAX Power            = %d", __FUNCTION__, dev->config->MaxPower*2);

	if (dev->config->bNumInterfaces != 1) {
		err ("%s - bNumInterfaces is not 1, ERROR!", __FUNCTION__);
		return -ENODEV;
	}

	return 0;
}

int TIReadRom (struct edgeport_serial *serial, int start_address, int length, __u8 *buffer)
{
	int status;

	if (serial->product_info.TiMode == TI_MODE_DOWNLOAD) {
		status = TIReadDownloadMemory (serial->serial->dev,
					       start_address,
					       length,
					       serial->TI_I2C_Type,
					       buffer);
	} else {
		status = TIReadBootMemory (serial,
					   start_address,
					   length,
					   buffer);
	}

	return status;
}

int TIWriteRom (struct edgeport_serial *serial, int start_address, int length, __u8 *buffer)
{
	if (serial->product_info.TiMode == TI_MODE_BOOT)
		return TIWriteBootMemory (serial,
					  start_address,
					  length,
					  buffer);

	if (serial->product_info.TiMode == TI_MODE_DOWNLOAD)
		return TIWriteDownloadI2C (serial,
					   start_address,
					   length,
					   serial->TI_I2C_Type,
					   buffer);

	return -EINVAL;
}



/* Read a descriptor header from I2C based on type */
static int TIGetDescriptorAddress (struct edgeport_serial *serial, int desc_type, struct ti_i2c_desc *rom_desc)
{
	int start_address;
	int status;

	/* Search for requested descriptor in I2C */
	start_address = 2;
	do {
		status = TIReadRom (serial,
				   start_address,
				   sizeof(struct ti_i2c_desc),
				   (__u8 *)rom_desc );
		if (status)
			return 0;

		if (rom_desc->Type == desc_type)
			return start_address;

		start_address = start_address + sizeof(struct ti_i2c_desc) +  rom_desc->Size;

	} while ((start_address < TI_MAX_I2C_SIZE) && rom_desc->Type);
	
	return 0;
}

/* Validate descriptor checksum */
static int ValidChecksum(struct ti_i2c_desc *rom_desc, __u8 *buffer)
{
	__u16 i;
	__u8 cs = 0;

	for (i=0; i < rom_desc->Size; i++) {
		cs = (__u8)(cs + buffer[i]);
	}
	if (cs != rom_desc->CheckSum) {
		dbg ("%s - Mismatch %x - %x", __FUNCTION__, rom_desc->CheckSum, cs);
		return -EINVAL;
	}
	return 0;
}

/* Make sure that the I2C image is good */
static int TiValidateI2cImage (struct edgeport_serial *serial)
{
	int status = 0;
	struct ti_i2c_desc *rom_desc;
	int start_address = 2;
	__u8 *buffer;

	rom_desc = kmalloc (sizeof (*rom_desc), GFP_KERNEL);
	if (!rom_desc) {
		err ("%s - out of memory", __FUNCTION__);
		return -ENOMEM;
	}
	buffer = kmalloc (TI_MAX_I2C_SIZE, GFP_KERNEL);
	if (!buffer) {
		err ("%s - out of memory when allocating buffer", __FUNCTION__);
		kfree (rom_desc);
		return -ENOMEM;
	}

	// Read the first byte (Signature0) must be 0x52
	status = TIReadRom (serial, 0, 1, buffer);
	if (status)
		goto ExitTiValidateI2cImage; 

	if (*buffer != 0x52) {
		err ("%s - invalid buffer signature", __FUNCTION__);
		status = -ENODEV;
		goto ExitTiValidateI2cImage;
	}

	do {
		// Validate the I2C
		status = TIReadRom (serial,
				start_address,
				sizeof(struct ti_i2c_desc),
				(__u8 *)rom_desc);
		if (status)
			break;

		if ((start_address + sizeof(struct ti_i2c_desc) + rom_desc->Size) > TI_MAX_I2C_SIZE) {
			status = -ENODEV;
			dbg ("%s - structure too big, erroring out.", __FUNCTION__);
			break;
		}

		dbg ("%s Type = 0x%x", __FUNCTION__, rom_desc->Type);

		// Skip type 2 record
		if ((rom_desc->Type & 0x0f) != I2C_DESC_TYPE_FIRMWARE_BASIC) {
			// Read the descriptor data
			status = TIReadRom(serial,
						start_address+sizeof(struct ti_i2c_desc),
						rom_desc->Size,
						buffer);
			if (status)
				break;

			status = ValidChecksum(rom_desc, buffer);
			if (status)
				break;
		}
		start_address = start_address + sizeof(struct ti_i2c_desc) + rom_desc->Size;

	} while ((rom_desc->Type != I2C_DESC_TYPE_ION) && (start_address < TI_MAX_I2C_SIZE));

	if ((rom_desc->Type != I2C_DESC_TYPE_ION) || (start_address > TI_MAX_I2C_SIZE))
		status = -ENODEV;

ExitTiValidateI2cImage:	
	kfree (buffer);
	kfree (rom_desc);
	return status;
}

static int TIReadManufDescriptor (struct edgeport_serial *serial, __u8 *buffer)
{
	int status;
	int start_address;
	struct ti_i2c_desc *rom_desc;
	struct edge_ti_manuf_descriptor *desc;

	rom_desc = kmalloc (sizeof (*rom_desc), GFP_KERNEL);
	if (!rom_desc) {
		err ("%s - out of memory", __FUNCTION__);
		return -ENOMEM;
	}
	start_address = TIGetDescriptorAddress (serial, I2C_DESC_TYPE_ION, rom_desc);

	if (!start_address) {
		dbg ("%s - Edge Descriptor not found in I2C", __FUNCTION__);
		status = -ENODEV;
		goto exit;
	}

	// Read the descriptor data
	status = TIReadRom (serial,
				start_address+sizeof(struct ti_i2c_desc),
				rom_desc->Size,
				buffer);
	if (status)
		goto exit;
	
	status = ValidChecksum(rom_desc, buffer);
	
	desc = (struct edge_ti_manuf_descriptor *)buffer;
	dbg ( "%s - IonConfig      0x%x", __FUNCTION__, desc->IonConfig 	);
	dbg ( "%s - Version          %d", __FUNCTION__, desc->Version	  	);
	dbg ( "%s - Cpu/Board      0x%x", __FUNCTION__, desc->CpuRev_BoardRev	);
	dbg ( "%s - NumPorts         %d", __FUNCTION__, desc->NumPorts  	);	
	dbg ( "%s - NumVirtualPorts  %d", __FUNCTION__, desc->NumVirtualPorts	);	
	dbg ( "%s - TotalPorts       %d", __FUNCTION__, desc->TotalPorts  	);	

exit:
	kfree (rom_desc);
	return status;
}

/* Build firmware header used for firmware update */
static int BuildI2CFirmwareHeader (__u8 *header)
{
	__u8 *buffer;
	int buffer_size;
	int i;
	__u8 cs = 0;
	struct ti_i2c_desc *i2c_header;
	struct ti_i2c_image_header *img_header;
	struct ti_i2c_firmware_rec *firmware_rec;

	// In order to update the I2C firmware we must change the type 2 record to type 0xF2.
	// This will force the UMP to come up in Boot Mode.  Then while in boot mode, the driver 
	// will download the latest firmware (padded to 15.5k) into the UMP ram. 
	// And finally when the device comes back up in download mode the driver will cause 
	// the new firmware to be copied from the UMP Ram to I2C and the firmware will update
	// the record type from 0xf2 to 0x02.
	
	// Allocate a 15.5k buffer + 2 bytes for version number (Firmware Record)
	buffer_size = (((1024 * 16) - 512 )+ sizeof(struct ti_i2c_firmware_rec));

	buffer = kmalloc (buffer_size, GFP_KERNEL);
	if (!buffer) {
		err ("%s - out of memory", __FUNCTION__);
		return -ENOMEM;
	}
	
	// Set entire image of 0xffs
	memset (buffer, 0xff, buffer_size);

	// Copy version number into firmware record
	firmware_rec = (struct ti_i2c_firmware_rec *)buffer;

	firmware_rec->Ver_Major	= OperationalCodeImageVersion.MajorVersion;
	firmware_rec->Ver_Minor	= OperationalCodeImageVersion.MinorVersion;

	// Pointer to fw_down memory image
	img_header = (struct ti_i2c_image_header *)&PagableOperationalCodeImage[0];

	memcpy (buffer + sizeof(struct ti_i2c_firmware_rec),
		&PagableOperationalCodeImage[sizeof(struct ti_i2c_image_header)],
		img_header->Length);

	for (i=0; i < buffer_size; i++) {
		cs = (__u8)(cs + buffer[i]);
	}

	kfree (buffer);

	// Build new header
	i2c_header =  (struct ti_i2c_desc *)header;
	firmware_rec =  (struct ti_i2c_firmware_rec*)i2c_header->Data;
	
	i2c_header->Type	= I2C_DESC_TYPE_FIRMWARE_BLANK;
	i2c_header->Size	= (__u16)buffer_size;
	i2c_header->CheckSum	= cs;
	firmware_rec->Ver_Major	= OperationalCodeImageVersion.MajorVersion;
	firmware_rec->Ver_Minor	= OperationalCodeImageVersion.MinorVersion;

	return 0;
}

/* Try to figure out what type of I2c we have */
static int TIGetI2cTypeInBootMode (struct edgeport_serial *serial)
{
	int status;
	__u8 data;
		
	// Try to read type 2
	status = TIReadVendorRequestSync (serial->serial->dev,
					UMPC_MEMORY_READ,		// Request
					DTK_ADDR_SPACE_I2C_TYPE_II,	// wValue (Address type)
					0,		 		// wIndex
					&data,				// TransferBuffer
					0x01);				// TransferBufferLength
	if (status)
		dbg ("%s - read 2 status error = %d", __FUNCTION__, status);
	else
		dbg ("%s - read 2 data = 0x%x", __FUNCTION__, data);
	if ((!status) && data == 0x52) {
		dbg ("%s - ROM_TYPE_II", __FUNCTION__);
		serial->TI_I2C_Type = DTK_ADDR_SPACE_I2C_TYPE_II;
		return 0;
	}

	// Try to read type 3
	status = TIReadVendorRequestSync (serial->serial->dev,
					UMPC_MEMORY_READ,		// Request
					DTK_ADDR_SPACE_I2C_TYPE_III,	// wValue (Address type)
					0,				// wIndex
					&data,				// TransferBuffer
					0x01);				// TransferBufferLength
	if (status)
		dbg ("%s - read 3 status error = %d", __FUNCTION__, status);
	else
		dbg ("%s - read 2 data = 0x%x", __FUNCTION__, data);
	if ((!status) && data == 0x52) {
		dbg ("%s - ROM_TYPE_III", __FUNCTION__);
		serial->TI_I2C_Type = DTK_ADDR_SPACE_I2C_TYPE_III;
		return 0;
	}

	dbg ("%s - Unknown", __FUNCTION__);
	serial->TI_I2C_Type = DTK_ADDR_SPACE_I2C_TYPE_II;
	return -ENODEV;
}

static int TISendBulkTransferSync (struct usb_serial *serial, void *buffer, int length, int *num_sent)
{
	int status;

	status = usb_bulk_msg (serial->dev,
				usb_sndbulkpipe(serial->dev,
						serial->port[0].bulk_out_endpointAddress),
				buffer,
				length,
				num_sent,
				HZ);
	return status;
}

/* Download given firmware image to the device (IN BOOT MODE) */
static int TIDownloadCodeImage (struct edgeport_serial *serial, __u8 *image, int image_length)
{
	int status = 0;
	int pos;
	int transfer;
	int done;

	// Transfer firmware image
	for (pos = 0; pos < image_length; ) {
		// Read the next buffer from file
		transfer = image_length - pos;
		if (transfer > EDGE_FW_BULK_MAX_PACKET_SIZE)
			transfer = EDGE_FW_BULK_MAX_PACKET_SIZE;

		// Transfer data
		status = TISendBulkTransferSync (serial->serial, &image[pos], transfer, &done);
		if (status)
			break;
		// Advance buffer pointer
		pos += done;
	}

	return status;
}

// FIXME!!!
static int TIConfigureBootDevice (struct usb_device *dev)
{
	return 0;
}

/**
 * DownloadTIFirmware - Download run-time operating firmware to the TI5052
 * 
 * This routine downloads the main operating code into the TI5052, using the
 * boot code already burned into E2PROM or ROM.
 */
static int TIDownloadFirmware (struct edgeport_serial *serial)
{
	int status = 0;
	int start_address;
	struct edge_ti_manuf_descriptor *ti_manuf_desc;
	struct usb_interface_descriptor *interface;
	int download_cur_ver;
	int download_new_ver;

	/* This routine is entered by both the BOOT mode and the Download mode
	 * We can determine which code is running by the reading the config
	 * descriptor and if we have only one bulk pipe it is in boot mode
	 */
	serial->product_info.hardware_type = HARDWARE_TYPE_TIUMP;

	/* Default to type 2 i2c */