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[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>
This commit is contained in:
Sonic Zhang 2008-04-25 03:06:10 +08:00 committed by Bryan Wu
parent 25bb23bfd0
commit 37167e6411
1 changed files with 13 additions and 7 deletions
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20
include/asm-blackfin/mach-bf548/mem_init.h
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@ -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)