Dne Po 17. května 2010 08:28:22 Mikhail Kshevetskiy napsal(a):
- strict following to section 6.4.10 of Intel PXA27xx Developer's Manual.
- use r7 to store CONFIG_SYS_MDREFR_VAL as r6 is used in pxa_wait_ticks
WARNING: This macro do not assume the values for K0DB4, KxDB2, KxFREE and APD bits of CONFIG_SYS_MDREFR_VAL as it was done early on many pxa platforms. All pxa developers that plan to use this macro should check the validity of their MDREFR values.
Exactly, I'd rather see the developers fix their configs instead of putting here some weird goo. But I might be wrong ... see below please.
Signed-off-by: Mikhail Kshevetskiy mikhail.kshevetskiy@gmail.com
arch/arm/include/asm/arch-pxa/macro.h | 81 +++++++++++++++++++++++---------- 1 files changed, 56 insertions(+), 25 deletions(-)
diff --git a/arch/arm/include/asm/arch-pxa/macro.h b/arch/arm/include/asm/arch-pxa/macro.h index 1f1759b..26d7a8d 100644 --- a/arch/arm/include/asm/arch-pxa/macro.h +++ b/arch/arm/include/asm/arch-pxa/macro.h @@ -102,7 +102,11 @@ /*
- This macro sets up the Memory controller of the PXA2xx CPU
- Clobbered regs: r3, r4, r5
- Clobbered regs: r3, r4, r5, r6, r7
- See section 6.4.10 of Intel PXA2xx Processor Developer's Manual
http://www.marvell.com/products/processors/applications/pxa_family/pxa_27x _dev_man.pdf + * http://www.marvell.com/products/processors/applications/pxa_family/PXA3xx_ Developers_Manual.zip */
Remove this, PXA3xx won't use this macro.
.macro pxa_mem_setup /* This comes handy when setting MDREFR */ @@ -149,27 +153,38 @@ */
/*
* Before accessing MDREFR we need a valid DRI field, so we set* this to power on defaults + DRI field.
* Before accessing MDREFR we need a valid DRI field.* Also we must properly configure MDREFR[K0DB2] and MDREFR[K0DB4].* Optionaly we can set MDREFR[KxFREE] bits.* So we set MDREFR to power on defaults + (DRI, K0DB2, K0DB4, KxFREE)* fields from the config.** WARNING: K0DB2 and K0DB4 bits are usually set, while KxFREE bits* are usually unser.
- bic r5, r5, #0x0ff
- bic r5, r5, #0xf00 /* MDREFR user config with zeroed DRI */
- ldr r4, =CONFIG_SYS_MDREFR_VAL
- mov r6, r4
- lsl r4, #20
- lsr r4, #20 /* Get a valid DRI field */
- ldr r4, =( 0xFFF | MDREFR_K0DB4 | MDREFR_K0DB2 )
- orr r4, #( MDREFR_K0FREE | MDREFR_K1FREE | MDREFR_K2FREE )
- bic r5, r5, r4 /* clear DRI, K0DB2, K0DB4, KxFREE fields */
- orr r5, r5, r4 /* MDREFR user config with correct DRI */
You can just wipe all the bits away, can't you ?
- /*
* r3 is busy with MEMC_BASE,* r4, r5, r6 used in pxa_wait_ticks and other places,* so use r7 to store user specified MDREFR_VAL*/- ldr r7, =CONFIG_SYS_MDREFR_VAL
- and r4, r7, r4
- orr r5, r5, r4 /* use custom DRI, K0DB2, K0DB4, KxFREE */
And replace it with user config (if the user config is done correctly of course. If the user config is incorrect, that's what should be fixed.)
orr r5, #MDREFR_K0RUN orr r5, #MDREFR_SLFRSH bic r5, #MDREFR_APD bic r5, #MDREFR_E1PIN
- bic r5, #MDREFR_K1RUN
- bic r5, #MDREFR_K2RUN
Then just fine-tune the bits according 6.4.10 in PXA270 manual.
btw. these bic's are unneeded according to the manual.
Ok, please try explaining why is this solution better from what was here? I'm kind of missing it, sorry.
str r5, [r3, #MDREFR_OFFSET]
- ldr r4, [r3, #MDREFR_OFFSET]
ldr r5, [r3, #MDREFR_OFFSET]
/*
- Initialize Synchronous Static Memory (Flash/Peripherals)
@@ -184,16 +199,29 @@ write32rb (MEMC_BASE + SXCNFG_OFFSET), CONFIG_SYS_SXCNFG_VAL
/*
* 6) Initialize SDRAM
* 6) Initialize SDRAM,* also we must properly set MDREFR[K1DB2] and MDREFR[K2DB2]** WARNING: K1DB2 and K2DB2 bits are usually set
- bic r6, #MDREFR_SLFRSH
- str r6, [r3, #MDREFR_OFFSET]
- ldr r4, [r3, #MDREFR_OFFSET]
- and r4, r7, #( MDREFR_K1DB2 | MDREFR_K2DB2 )
- ldr r5, [r3, #MDREFR_OFFSET]
- bic r5, #( MDREFR_K1DB2 | MDREFR_K2DB2 )
- orr r5, r5, r4
- orr r6, #MDREFR_E1PIN
- str r6, [r3, #MDREFR_OFFSET]
- ldr r4, [r3, #MDREFR_OFFSET]
- orr r5, #MDREFR_K1RUN
- orr r5, #MDREFR_K2RUN
No, don't enable this unconditionally.
str r5, [r3, #MDREFR_OFFSET]
ldr r5, [r3, #MDREFR_OFFSET]
bic r5, #MDREFR_SLFRSH
str r5, [r3, #MDREFR_OFFSET]
ldr r5, [r3, #MDREFR_OFFSET]
orr r5, #MDREFR_E1PIN
str r5, [r3, #MDREFR_OFFSET]
ldr r5, [r3, #MDREFR_OFFSET]
/*
- Write MDCNFG with MDCNFG:DEx deasserted (set to 0), to configure
@@ -246,14 +274,17 @@ ldr r4, [r3, #MDMRS_OFFSET]
/*
* 11) Enable APD
* 11) Optionaly enable MDREFR[APD]** WARNING: APD bit is usually set.
- ldr r4, [r3, #MDREFR_OFFSET]
- and r6, r6, #MDREFR_APD
- orr r4, r4, r6
- str r4, [r3, #MDREFR_OFFSET]
- ldr r4, [r3, #MDREFR_OFFSET]
- and r7, #MDREFR_APD
- ldr r5, [r3, #MDREFR_OFFSET]
- bic r5, #MDREFR_APD
- orr r5, r5, r7
- str r5, [r3, #MDREFR_OFFSET]
- ldr r5, [r3, #MDREFR_OFFSET]
Why are you adding complexity here ?
.endm
/*
Good work so far, cheers!