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powerpc/mpc8xxx: Add DDR2 to unified DDR driver

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DDR2 has different ODT table and values. Adding table according to Samsung
application note.

Fix additive latency calculation to avoid interger underflow.

Also converted typedef dynamic_odt_t to struct dynamic_odt.

Signed-off-by: York Sun <yorksun@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
This commit is contained in:
York Sun
2011-08-26 11:32:43 -07:00
committed by Kumar Gala
parent 905acde21a
commit 4e57382faa
4 changed files with 287 additions and 17 deletions
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52
doc/README.fsl-ddr
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@@ -170,3 +170,55 @@ Single slot system
Reference http://www.xrosstalkmag.com/mag_issues/xrosstalk_oct08_final.pdf
http://download.micron.com/pdf/technotes/ddr3/tn4108_ddr3_design_guide.pdf
Table for ODT for DDR2
======================
Two slots system
+-----------------------+----------+---------------+-----------------------------+-----------------------------+
| Configuration | |DRAM controller| Slot 1 | Slot 2 |
+-----------+-----------+----------+-------+-------+--------------+--------------+--------------+--------------+
| | | | | | Rank 1 | Rank 2 | Rank 1 | Rank 2 |
+ Slot 1 | Slot 2 |Write/Read| Write | Read |-------+------+-------+------+-------+------+-------+------+
| | | | | | Write | Read | Write | Read | Write | Read | Write | Read |
+-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
| | | Slot 1 | off | 150 | off | off | off | off | 75 | 75 | off | off |
| Dual Rank | Dual Rank |----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
| | | Slot 2 | off | 150 | 75 | 75 | off | off | off | off | off | off |
+-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
| | | Slot 1 | off | 150 | off | off | off | off | 75 | 75 | | |
| Dual Rank |Single Rank|----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
| | | Slot 2 | off | 150 | 75 | 75 | off | off | off | off | | |
+-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
| | | Slot 1 | off | 150 | off | off | | | 75 | 75 | off | off |
|Single Rank| Dual Rank |----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
| | | Slot 2 | off | 150 | 75 | 75 | | | off | off | off | off |
+-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
| | | Slot 1 | off | 150 | off | off | | | 75 | 75 | | |
|Single Rank|Single Rank|----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
| | | Slot 2 | off | 150 | 75 | 75 | | | off | off | | |
+-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
| Dual Rank | Empty | Slot 1 | off | 75 | 150 | off | off | off | | | | |
+-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
| Empty | Dual Rank | Slot 2 | off | 75 | | | | | 150 | off | off | off |
+-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
|Single Rank| Empty | Slot 1 | off | 75 | 150 | off | | | | | | |
+-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
| Empty |Single Rank| Slot 2 | off | 75 | | | | | 150 | off | | |
+-----------+-----------+----------+-------+-------+-------+------+-------+------+-------+------+-------+------+
Single slot system
+-------------+------------+---------------+-----------------------------+
| | |DRAM controller| Rank 1 | Rank 2 |
|Configuration| Write/Read |-------+-------+-------+------+-------+------+
| | | Write | Read | Write | Read | Write | Read |
+-------------+------------+-------+-------+-------+------+-------+------+
| | R1 | off | 75 | 150 | off | off | off |
| Dual Rank |------------+-------+-------+-------+------+-------+------+
| | R2 | off | 75 | 150 | off | off | off |
+-------------+------------+-------+-------+-------+------+-------+------+
| Single Rank | R1 | off | 75 | 150 | off |
+-------------+------------+-------+-------+-------+------+
Reference http://www.samsung.com/global/business/semiconductor/products/dram/downloads/applicationnote/ddr2_odt_control_200603.pdf