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authorSonic Zhang <sonic.zhang@analog.com>2008-04-25 03:06:10 +0800
committerBryan Wu <cooloney@kernel.org>2008-04-25 03:06:10 +0800
commit37167e6411f15fc8d8da8acabfd7cdd17668ffad (patch)
tree04952c29952d995885369fde761b0b417c0de36f
parent25bb23bfd061075955ca68b6a336c542d56263b3 (diff)
[Blackfin] arch: Fix bug - Properly calculate DDR clock.
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
-rw-r--r--include/asm-blackfin/mach-bf548/mem_init.h20
1 files changed, 13 insertions, 7 deletions
diff --git a/include/asm-blackfin/mach-bf548/mem_init.h b/include/asm-blackfin/mach-bf548/mem_init.h
index befc2903d5a..ab0b863eee6 100644
--- a/include/asm-blackfin/mach-bf548/mem_init.h
+++ b/include/asm-blackfin/mach-bf548/mem_init.h
@@ -29,16 +29,19 @@
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#define MIN_DDR_SCLK(x) (x*(CONFIG_SCLK_HZ/1000/1000)/1000 + 1)
+#define MAX_DDR_SCLK(x) (x*(CONFIG_SCLK_HZ/1000/1000)/1000)
+#define DDR_CLK_HZ(x) (1000*1000*1000/x)
#if (CONFIG_MEM_MT46V32M16_6T)
#define DDR_SIZE DEVSZ_512
#define DDR_WIDTH DEVWD_16
+#define DDR_MAX_tCK 13
#define DDR_tRC DDR_TRC(MIN_DDR_SCLK(60))
#define DDR_tRAS DDR_TRAS(MIN_DDR_SCLK(42))
#define DDR_tRP DDR_TRP(MIN_DDR_SCLK(15))
#define DDR_tRFC DDR_TRFC(MIN_DDR_SCLK(72))
-#define DDR_tREFI DDR_TREFI(MIN_DDR_SCLK(7800))
+#define DDR_tREFI DDR_TREFI(MAX_DDR_SCLK(7800))
#define DDR_tRCD DDR_TRCD(MIN_DDR_SCLK(15))
#define DDR_tWTR DDR_TWTR(1)
@@ -49,12 +52,13 @@
#if (CONFIG_MEM_MT46V32M16_5B)
#define DDR_SIZE DEVSZ_512
#define DDR_WIDTH DEVWD_16
+#define DDR_MAX_tCK 13
#define DDR_tRC DDR_TRC(MIN_DDR_SCLK(55))
#define DDR_tRAS DDR_TRAS(MIN_DDR_SCLK(40))
#define DDR_tRP DDR_TRP(MIN_DDR_SCLK(15))
#define DDR_tRFC DDR_TRFC(MIN_DDR_SCLK(70))
-#define DDR_tREFI DDR_TREFI(MIN_DDR_SCLK(7800))
+#define DDR_tREFI DDR_TREFI(MAX_DDR_SCLK(7800))
#define DDR_tRCD DDR_TRCD(MIN_DDR_SCLK(15))
#define DDR_tWTR DDR_TWTR(2)
@@ -65,6 +69,7 @@
#if (CONFIG_MEM_GENERIC_BOARD)
#define DDR_SIZE DEVSZ_512
#define DDR_WIDTH DEVWD_16
+#define DDR_MAX_tCK 13
#define DDR_tRCD DDR_TRCD(3)
#define DDR_tWTR DDR_TWTR(2)
@@ -77,14 +82,15 @@
#define DDR_tREFI DDR_TREFI(1288)
#endif
-#if (CONFIG_SCLK_HZ <= 133333333)
-#define DDR_CL CL_2
-#elif (CONFIG_SCLK_HZ <= 166666666)
-#define DDR_CL CL_2_5
+#if (CONFIG_SCLK_HZ < DDR_CLK_HZ(DDR_MAX_tCK))
+# error "CONFIG_SCLK_HZ is too small (<DDR_CLK_HZ(DDR_MAX_tCK) Hz)."
+#elif(CONFIG_SCLK_HZ <= 133333333)
+# define DDR_CL CL_2
#else
-#define DDR_CL CL_3
+# error "CONFIG_SCLK_HZ is too large (>133333333 Hz)."
#endif
+
#define mem_DDRCTL0 (DDR_tRP | DDR_tRAS | DDR_tRC | DDR_tRFC | DDR_tREFI)
#define mem_DDRCTL1 (DDR_DATWIDTH | EXTBANK_1 | DDR_SIZE | DDR_WIDTH | DDR_tWTR \
| DDR_tMRD | DDR_tWR | DDR_tRCD)