[POWERPC] QE: Add ability to upload QE firmware

Define the layout of a binary blob that contains a QE firmware and instructions
on how to upload it.  Add function qe_upload_firmware() to parse the blob
and perform the actual upload.  Fully define 'struct rsp' in immap_qe.h to
include the actual RISC Special Registers.  Added description of a new
QE firmware node to booting-without-of.txt.

Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

1 files changed, 295 insertions, 0 deletions

diff --git a/Documentation/powerpc/qe_firmware.txt b/Documentation/powerpc/qe_firmware.txt
new file mode 100644
index 000000000000..896266432d33
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+++ b/Documentation/powerpc/qe_firmware.txt
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+	   Freescale QUICC Engine Firmware Uploading
+	   -----------------------------------------
+
+(c) 2007 Timur Tabi <timur at freescale.com>,
+    Freescale Semiconductor
+
+Table of Contents
+=================
+
+  I - Software License for Firmware
+
+  II - Microcode Availability
+
+  III - Description and Terminology
+
+  IV - Microcode Programming Details
+
+  V - Firmware Structure Layout
+
+  VI - Sample Code for Creating Firmware Files
+
+Revision Information
+====================
+
+November 30, 2007: Rev 1.0 - Initial version
+
+I - Software License for Firmware
+=================================
+
+Each firmware file comes with its own software license.  For information on
+the particular license, please see the license text that is distributed with
+the firmware.
+
+II - Microcode Availability
+===========================
+
+Firmware files are distributed through various channels.  Some are available on
+http://opensource.freescale.com.  For other firmware files, please contact
+your Freescale representative or your operating system vendor.
+
+III - Description and Terminology
+================================
+
+In this document, the term 'microcode' refers to the sequence of 32-bit
+integers that compose the actual QE microcode.
+
+The term 'firmware' refers to a binary blob that contains the microcode as
+well as other data that
+
+	1) describes the microcode's purpose
+	2) describes how and where to upload the microcode
+	3) specifies the values of various registers
+	4) includes additional data for use by specific device drivers
+
+Firmware files are binary files that contain only a firmware.
+
+IV - Microcode Programming Details
+===================================
+
+The QE architecture allows for only one microcode present in I-RAM for each
+RISC processor.  To replace any current microcode, a full QE reset (which
+disables the microcode) must be performed first.
+
+QE microcode is uploaded using the following procedure:
+
+1) The microcode is placed into I-RAM at a specific location, using the
+   IRAM.IADD and IRAM.IDATA registers.
+
+2) The CERCR.CIR bit is set to 0 or 1, depending on whether the firmware
+   needs split I-RAM.  Split I-RAM is only meaningful for SOCs that have
+   QEs with multiple RISC processors, such as the 8360.  Splitting the I-RAM
+   allows each processor to run a different microcode, effectively creating an
+   asymmetric multiprocessing (AMP) system.
+
+3) The TIBCR trap registers are loaded with the addresses of the trap handlers
+   in the microcode.
+
+4) The RSP.ECCR register is programmed with the value provided.
+
+5) If necessary, device drivers that need the virtual traps and extended mode
+   data will use them.
+
+Virtual Microcode Traps
+
+These virtual traps are conditional branches in the microcode.  These are
+"soft" provisional introduced in the ROMcode in order to enable higher
+flexibility and save h/w traps If new features are activated or an issue is
+being fixed in the RAM package utilizing they should be activated.  This data
+structure signals the microcode which of these virtual traps is active.
+
+This structure contains 6 words that the application should copy to some
+specific been defined.  This table describes the structure.
+
+	---------------------------------------------------------------
+	| Offset in |                  | Destination Offset | Size of |
+	|   array   |     Protocol     |   within PRAM      | Operand |
+	--------------------------------------------------------------|
+	|     0     | Ethernet         |      0xF8          | 4 bytes |
+	|           | interworking     |                    |         |
+	---------------------------------------------------------------
+	|     4     | ATM              |      0xF8          | 4 bytes |
+	|           | interworking     |                    |         |
+	---------------------------------------------------------------
+	|     8     | PPP              |      0xF8          | 4 bytes |
+	|           | interworking     |                    |         |
+	---------------------------------------------------------------
+	|     12    | Ethernet RX      |      0x22          | 1 byte  |
+	|           | Distributor Page |                    |         |
+	---------------------------------------------------------------
+	|     16    | ATM Globtal      |      0x28          | 1 byte  |
+	|           | Params Table     |                    |         |
+	---------------------------------------------------------------
+	|     20    | Insert Frame     |      0xF8          | 4 bytes |
+	---------------------------------------------------------------
+
+
+Extended Modes
+
+This is a double word bit array (64 bits) that defines special functionality
+which has an impact on the softwarew drivers.  Each bit has its own impact
+and has special instructions for the s/w associated with it.  This structure is
+described in this table:
+
+	-----------------------------------------------------------------------
+	| Bit #  |     Name     |   Description                               |
+	-----------------------------------------------------------------------
+	|   0    | General      | Indicates that prior to each host command   |
+	|        | push command | given by the application, the software must |
+	|        |              | assert a special host command (push command)|
+	|        |              | CECDR = 0x00800000.                         |
+	|        |              | CECR = 0x01c1000f.                          |
+	-----------------------------------------------------------------------
+	|   1    | UCC ATM      | Indicates that after issuing ATM RX INIT    |
+	|        | RX INIT      | command, the host must issue another special|
+	|        | push command | command (push command) and immediately      |
+	|        |              | following that re-issue the ATM RX INIT     |
+	|        |              | command. (This makes the sequence of        |
+	|        |              | initializing the ATM receiver a sequence of |
+	|        |              | three host commands)                        |
+	|        |              | CECDR = 0x00800000.                         |
+	|        |              | CECR = 0x01c1000f.                          |
+	-----------------------------------------------------------------------
+	|   2    | Add/remove   | Indicates that following the specific host  |
+	|        | command      | command: "Add/Remove entry in Hash Lookup   |
+	|        | validation   | Table" used in Interworking setup, the user |
+	|        |              | must issue another command.                 |
+	|        |              | CECDR = 0xce000003.                         |
+	|        |              | CECR = 0x01c10f58.                          |
+	-----------------------------------------------------------------------
+	|   3    | General push | Indicates that the s/w has to initialize    |
+	|        | command      | some pointers in the Ethernet thread pages  |
+	|        |              | which are used when Header Compression is   |
+	|        |              | activated.  The full details of these       |
+	|        |              | pointers is located in the software drivers.|
+	-----------------------------------------------------------------------
+	|   4    | General push | Indicates that after issuing Ethernet TX    |
+	|        | command      | INIT command, user must issue this command  |
+	|        |              | for each SNUM of Ethernet TX thread.        |
+	|        |              | CECDR = 0x00800003.                         |
+	|        |              | CECR = 0x7'b{0}, 8'b{Enet TX thread SNUM},  |
+	|        |              |        1'b{1}, 12'b{0}, 4'b{1}              |
+	-----------------------------------------------------------------------
+	| 5 - 31 |     N/A      | Reserved, set to zero.                      |
+	-----------------------------------------------------------------------
+
+V - Firmware Structure Layout
+==============================
+
+QE microcode from Freescale is typically provided as a header file.  This
+header file contains macros that define the microcode binary itself as well as
+some other data used in uploading that microcode.  The format of these files
+do not lend themselves to simple inclusion into other code.  Hence,
+the need for a more portable format.  This section defines that format.
+
+Instead of distributing a header file, the microcode and related data are
+embedded into a binary blob.  This blob is passed to the qe_upload_firmware()
+function, which parses the blob and performs everything necessary to upload
+the microcode.
+
+All integers are big-endian.  See the comments for function
+qe_upload_firmware() for up-to-date implementation information.
+
+This structure supports versioning, where the version of the structure is
+embedded into the structure itself.  To ensure forward and backwards
+compatibility, all versions of the structure must use the same 'qe_header'
+structure at the beginning.
+
+'header' (type: struct qe_header):
+	The 'length' field is the size, in bytes, of the entire structure,
+	including all the microcode embedded in it, as well as the CRC (if
+	present).
+
+	The 'magic' field is an array of three bytes that contains the letters
+	'Q', 'E', and 'F'.  This is an identifier that indicates that this
+	structure is a QE Firmware structure.
+
+	The 'version' field is a single byte that indicates the version of this
+	structure.  If the layout of the structure should ever need to be
+	changed to add support for additional types of microcode, then the
+	version number should also be changed.
+
+The 'id' field is a null-terminated string(suitable for printing) that
+identifies the firmware.
+
+The 'count' field indicates the number of 'microcode' structures.  There
+must be one and only one 'microcode' structure for each RISC processor.
+Therefore, this field also represents the number of RISC processors for this
+SOC.
+
+The 'soc' structure contains the SOC numbers and revisions used to match
+the microcode to the SOC itself.  Normally, the microcode loader should
+check the data in this structure with the SOC number and revisions, and
+only upload the microcode if there's a match.  However, this check is not
+made on all platforms.
+
+Although it is not recommended, you can specify '0' in the soc.model
+field to skip matching SOCs altogether.
+
+The 'model' field is a 16-bit number that matches the actual SOC. The
+'major' and 'minor' fields are the major and minor revision numbrs,
+respectively, of the SOC.
+
+For example, to match the 8323, revision 1.0:
+     soc.model = 8323
+     soc.major = 1
+     soc.minor = 0
+
+'padding' is neccessary for structure alignment.  This field ensures that the
+'extended_modes' field is aligned on a 64-bit boundary.
+
+'extended_modes' is a bitfield that defines special functionality which has an
+impact on the device drivers.  Each bit has its own impact and has special
+instructions for the driver associated with it.  This field is stored in
+the QE library and available to any driver that calles qe_get_firmware_info().
+
+'vtraps' is an array of 8 words that contain virtual trap values for each
+virtual traps.  As with 'extended_modes', this field is stored in the QE
+library and available to any driver that calles qe_get_firmware_info().
+
+'microcode' (type: struct qe_microcode):
+	For each RISC processor there is one 'microcode' structure.  The first
+	'microcode' structure is for the first RISC, and so on.
+
+	The 'id' field is a null-terminated string suitable for printing that
+	identifies this particular microcode.
+
+	'traps' is an array of 16 words that contain hardware trap values
+	for each of the 16 traps.  If trap[i] is 0, then this particular
+	trap is to be ignored (i.e. not written to TIBCR[i]).  The entire value
+	is written as-is to the TIBCR[i] register, so be sure to set the EN
+	and T_IBP bits if necessary.
+
+	'eccr' is the value to program into the ECCR register.
+
+	'iram_offset' is the offset into IRAM to start writing the
+	microcode.
+
+	'count' is the number of 32-bit words in the microcode.
+
+	'code_offset' is the offset, in bytes, from the beginning of this
+	structure where the microcode itself can be found.  The first
+	microcode binary should be located immediately after the 'microcode'
+	array.
+
+	'major', 'minor', and 'revision' are the major, minor, and revision
+	version numbers, respectively, of the microcode.  If all values are 0,
+	then these fields are ignored.
+
+	'reserved' is necessary for structure alignment.  Since 'microcode'
+	is an array, the 64-bit 'extended_modes' field needs to be aligned
+	on a 64-bit boundary, and this can only happen if the size of
+	'microcode' is a multiple of 8 bytes.  To ensure that, we add
+	'reserved'.
+
+After the last microcode is a 32-bit CRC.  It can be calculated using
+this algorithm:
+
+u32 crc32(const u8 *p, unsigned int len)
+{
+	unsigned int i;
+	u32 crc = 0;
+
+	while (len--) {
+	   crc ^= *p++;
+	   for (i = 0; i < 8; i++)
+		   crc = (crc >> 1) ^ ((crc & 1) ? 0xedb88320 : 0);
+	}
+	return crc;
+}
+
+VI - Sample Code for Creating Firmware Files
+============================================
+
+A Python program that creates firmware binaries from the header files normally
+distributed by Freescale can be found on http://opensource.freescale.com.