From e02c521d94b45d7b05aa522e4ccde6b74bf5fe57 Mon Sep 17 00:00:00 2001 From: Stefan Roese Date: Wed, 9 Jan 2008 10:23:16 +0100 Subject: ppc4xx: Add 44x cache locking to better support init-ram in d-cache This patch adds support for locking the init-ram/stack in d-cache, so that other regions may use d-cache as well Note, that this current implementation locks exactly 4k of d-cache, so please make sure that you don't define a bigger init-ram area. Take a look at the lwmon5 440EPx implementation as a reference. Signed-off-by: Stefan Roese diff --git a/cpu/ppc4xx/start.S b/cpu/ppc4xx/start.S index 52601ed..a730604 100644 --- a/cpu/ppc4xx/start.S +++ b/cpu/ppc4xx/start.S @@ -636,6 +636,33 @@ _start: dcbz r0,r3 addi r3,r3,32 bdnz ..d_ag + + /* + * Lock the init-ram/stack in d-cache, so that other regions + * may use d-cache as well + * Note, that this current implementation locks exactly 4k + * of d-cache, so please make sure that you don't define a + * bigger init-ram area. Take a look at the lwmon5 440EPx + * implementation as a reference. + */ + msync + isync + /* 8. set TFLOOR/NFLOOR to 8 (-> 8*16*32 bytes locked -> 4k) */ + lis r1,0x0201 + ori r1,r1,0xf808 + mtspr dvlim,r1 + lis r1,0x0808 + ori r1,r1,0x0808 + mtspr dnv0,r1 + mtspr dnv1,r1 + mtspr dnv2,r1 + mtspr dnv3,r1 + mtspr dtv0,r1 + mtspr dtv1,r1 + mtspr dtv2,r1 + mtspr dtv3,r1 + msync + isync #endif /* CFG_INIT_RAM_DCACHE */ /* 440EP & 440GR are only 440er PPC's without internal SRAM */ @@ -1345,6 +1372,31 @@ relocate_code: mr r4,r10 mr r5,r11 #endif + +#ifdef CFG_INIT_RAM_DCACHE + /* + * Unlock the previously locked d-cache + */ + msync + isync + /* set TFLOOR/NFLOOR to 0 again */ + lis r6,0x0001 + ori r6,r6,0xf800 + mtspr dvlim,r6 + lis r6,0x0000 + ori r6,r6,0x0000 + mtspr dnv0,r6 + mtspr dnv1,r6 + mtspr dnv2,r6 + mtspr dnv3,r6 + mtspr dtv0,r6 + mtspr dtv1,r6 + mtspr dtv2,r6 + mtspr dtv3,r6 + msync + isync +#endif /* CFG_INIT_RAM_DCACHE */ + #if defined(CONFIG_440EP) || defined(CONFIG_440GR) || \ defined(CONFIG_440EPX) || defined(CONFIG_440GRX) || \ defined(CONFIG_440SP) || defined(CONFIG_440SPE) -- cgit v0.10.2 From 1754f50b710194f886b6f2831803d8960171a14d Mon Sep 17 00:00:00 2001 From: Stefan Roese Date: Wed, 9 Jan 2008 10:25:46 +0100 Subject: ppc4xx: Add CFG_POST_ALT_WORD_ADDR to support non OCM POST WORD storage The privious 4xx POST implementation only supported storing the POST WORD in OCM. Since we need to reserve the OCM on LWMON5 for the logbuffer we need to store the POST WORD in some other non volatile location. This patch adds CFG_POST_ALT_WORD_ADDR to specify an address for such a location. Signed-off-by: Stefan Roese diff --git a/cpu/ppc4xx/commproc.c b/cpu/ppc4xx/commproc.c index 68aab5b..22156dd 100644 --- a/cpu/ppc4xx/commproc.c +++ b/cpu/ppc4xx/commproc.c @@ -26,10 +26,21 @@ #include #include - +#include #if defined(CONFIG_POST) || defined(CONFIG_LOGBUFFER) +#if defined(CFG_POST_ALT_WORD_ADDR) +void post_word_store (ulong a) +{ + out_be32((void *)CFG_POST_ALT_WORD_ADDR, a); +} + +ulong post_word_load (void) +{ + return in_be32((void *)CFG_POST_ALT_WORD_ADDR); +} +#else /* CFG_POST_ALT_WORD_ADDR */ void post_word_store (ulong a) { volatile void *save_addr = (volatile void *)(CFG_OCM_DATA_ADDR + CFG_POST_WORD_ADDR); @@ -41,6 +52,7 @@ ulong post_word_load (void) volatile void *save_addr = (volatile void *)(CFG_OCM_DATA_ADDR + CFG_POST_WORD_ADDR); return *(volatile ulong *) save_addr; } +#endif /* CFG_POST_ALT_WORD_ADDR */ #endif /* CONFIG_POST || CONFIG_LOGBUFFER*/ -- cgit v0.10.2 From 8f24e0637ae113500d8bd60d80d57afcc0aa8bde Mon Sep 17 00:00:00 2001 From: Stefan Roese Date: Wed, 9 Jan 2008 10:28:20 +0100 Subject: ppc4xx: Change LWMON5 to not use OCM for init-ram and POST anymore This patch configures the LWMON5 port to use d-cache as init-ram and the unused GPT0_COMP6 as POST WORD storage. Signed-off-by: Stefan Roese diff --git a/board/lwmon5/init.S b/board/lwmon5/init.S index 6798e80..5aade72 100644 --- a/board/lwmon5/init.S +++ b/board/lwmon5/init.S @@ -57,7 +57,7 @@ tlbtab: #ifdef CFG_INIT_RAM_DCACHE /* TLB-entry for init-ram in dcache (SA_I must be turned off!) */ - tlbentry(CFG_INIT_RAM_ADDR, SZ_64K, CFG_INIT_RAM_ADDR, 0, AC_R|AC_W|AC_X|SA_G) + tlbentry(CFG_INIT_RAM_ADDR, SZ_4K, CFG_INIT_RAM_ADDR, 0, AC_R|AC_W|AC_X|SA_G) #endif /* TLB-entry for PCI Memory */ diff --git a/include/configs/lwmon5.h b/include/configs/lwmon5.h index 5210024..0bf536b 100644 --- a/include/configs/lwmon5.h +++ b/include/configs/lwmon5.h @@ -71,15 +71,20 @@ /*----------------------------------------------------------------------- * Initial RAM & stack pointer *----------------------------------------------------------------------*/ -/* 440EPx/440GRx have 16KB of internal SRAM, so no need for D-Cache */ -#define CFG_INIT_RAM_ADDR CFG_OCM_BASE /* OCM */ -#define CFG_OCM_DATA_ADDR CFG_OCM_BASE - +/* + * On LWMON5 we use D-cache as init-ram and stack pointer. We also move + * the POST_WORD from OCM to a 440EPx register that preserves it's + * content during reset (GPT0_COM6). This way we reserve the OCM (16k) + * for logbuffer only. + */ +#define CFG_INIT_RAM_DCACHE 1 /* d-cache as init ram */ +#define CFG_INIT_RAM_ADDR 0x70000000 /* DCache */ #define CFG_INIT_RAM_END (4 << 10) -#define CFG_GBL_DATA_SIZE 256 /* num bytes initial data */ +#define CFG_GBL_DATA_SIZE 256 /* num bytes initial data*/ #define CFG_GBL_DATA_OFFSET (CFG_INIT_RAM_END - CFG_GBL_DATA_SIZE) -#define CFG_POST_WORD_ADDR (CFG_GBL_DATA_OFFSET - 0x4) -#define CFG_INIT_SP_OFFSET CFG_POST_WORD_ADDR +#define CFG_INIT_SP_OFFSET CFG_GBL_DATA_OFFSET +#define CFG_POST_ALT_WORD_ADDR (CFG_PERIPHERAL_BASE + GPT0_COMP6) + /* unused GPT0 COMP reg */ /*----------------------------------------------------------------------- * Serial Port diff --git a/include/ppc440.h b/include/ppc440.h index 90e56b0..b0d16fb 100644 --- a/include/ppc440.h +++ b/include/ppc440.h @@ -1354,8 +1354,6 @@ #define plb1_bearl (PLB_ARBITER_BASE+ 0x0C) #define plb1_bearh (PLB_ARBITER_BASE+ 0x0D) -#if defined(CONFIG_440EP) || defined(CONFIG_440GR) || \ - defined(CONFIG_440EPX) || defined(CONFIG_440GRX) /* Pin Function Control Register 1 */ #define SDR0_PFC1 0x4101 #define SDR0_PFC1_U1ME_MASK 0x02000000 /* UART1 Mode Enable */ @@ -1421,7 +1419,7 @@ #define SDR0_MFR_PKT_REJ_EN1 0x00080000 /* Pkt Rej. Enable on EMAC3(1) */ #define SDR0_MFR_PKT_REJ_POL 0x00200000 /* Packet Reject Polarity */ -#endif /* defined(CONFIG_440EP) || defined(CONFIG_440GR) */ +#define GPT0_COMP6 0x00000098 #if defined(CONFIG_440EPX) || defined(CONFIG_440GRX) #define SDR0_USB2D0CR 0x0320 -- cgit v0.10.2 From b2e2142c500c48a57f18f9dd30e66c13caea0971 Mon Sep 17 00:00:00 2001 From: Stefan Roese Date: Wed, 9 Jan 2008 10:38:58 +0100 Subject: POST: Execute SPR test after relocation On LWMON5 we now use d-cache as init-ram and stack. The SPR POST test uses self modifying code and this doesn't work with stack in d-cache, since I can't move the code from d-cache to i-cache. We move the SPR test to be executed a little later, after relocation. Then stack is located in SDRAM and this self-modifying code is no problem anymore. Signed-off-by: Stefan Roese diff --git a/post/tests.c b/post/tests.c index e1c3d28..0c49e32 100644 --- a/post/tests.c +++ b/post/tests.c @@ -194,7 +194,7 @@ struct post_test post_list[] = "SPR test", "spr", "This test checks SPR contents.", - POST_ROM | POST_ALWAYS | POST_PREREL, + POST_RAM | POST_ALWAYS, &spr_post_test, NULL, NULL, -- cgit v0.10.2