From: Peter Tyser Date: Fri, 23 Oct 2009 20:55:47 +0000 (-0500) Subject: 85xx: MP Boot Page Translation update X-Git-Url: http://git.dujemihanovic.xyz/?a=commitdiff_plain;h=5ccd29c3679b3669b0bde5c501c1aa0f325a7acb;p=u-boot.git 85xx: MP Boot Page Translation update This change has 3 goals: - Have secondary cores be released into spin loops at their 'true' address in SDRAM. Previously, secondary cores were put into spin loops in the 0xfffffxxx address range which required that boot page translation was always enabled while cores were in their spin loops. - Allow the TLB window that the primary core uses to access the secondary cores boot page to be placed at any address. Previously, a TLB window at 0xfffff000 was always used to access the seconary cores' boot page. This TLB address requirement overlapped with other peripherals on some boards (eg XPedite5370). By default, the boot page TLB will still use the 0xfffffxxx address range, but this can be overridden on a board-by-board basis by defining a custom CONFIG_BPTR_VIRT_ADDR. Note that the TLB used to map the boot page remains in use while U-Boot executes. Previously it was only temporarily used, then restored to its initial value. - Allow Boot Page Translation to be disabled on bootup. Previously, Boot Page Translation was always left enabled after secondary cores were brought out of reset. This caused the 0xfffffxxx address range to somewhat "magically" be translated to an address in SDRAM. Some boards may not want this oddity in their memory map, so defining CONFIG_MPC8xxx_DISABLE_BPTR will turn off Boot Page Translation after the secondary cores are initialized. These changes are only applicable to 85xx boards with CONFIG_MP defined. Signed-off-by: Peter Tyser Signed-off-by: Kumar Gala --- diff --git a/cpu/mpc85xx/fdt.c b/cpu/mpc85xx/fdt.c index efb6518822..de2dcac816 100644 --- a/cpu/mpc85xx/fdt.c +++ b/cpu/mpc85xx/fdt.c @@ -43,7 +43,7 @@ extern void ft_fixup_num_cores(void *blob); void ft_fixup_cpu(void *blob, u64 memory_limit) { int off; - ulong spin_tbl_addr = get_spin_addr(); + ulong spin_tbl_addr = get_spin_phys_addr(); u32 bootpg = determine_mp_bootpg(); u32 id = get_my_id(); diff --git a/cpu/mpc85xx/mp.c b/cpu/mpc85xx/mp.c index b5c6020c7f..00b6450692 100644 --- a/cpu/mpc85xx/mp.c +++ b/cpu/mpc85xx/mp.c @@ -52,10 +52,10 @@ int cpu_status(int nr) u32 *table, id = get_my_id(); if (nr == id) { - table = (u32 *)get_spin_addr(); + table = (u32 *)get_spin_virt_addr(); printf("table base @ 0x%p\n", table); } else { - table = (u32 *)get_spin_addr() + nr * NUM_BOOT_ENTRY; + table = (u32 *)get_spin_virt_addr() + nr * NUM_BOOT_ENTRY; printf("Running on cpu %d\n", id); printf("\n"); printf("table @ 0x%p\n", table); @@ -77,7 +77,7 @@ static u8 boot_entry_map[4] = { int cpu_release(int nr, int argc, char *argv[]) { - u32 i, val, *table = (u32 *)get_spin_addr() + nr * NUM_BOOT_ENTRY; + u32 i, val, *table = (u32 *)get_spin_virt_addr() + nr * NUM_BOOT_ENTRY; u64 boot_addr; if (nr == get_my_id()) { @@ -124,23 +124,29 @@ u32 determine_mp_bootpg(void) return (gd->ram_size - 4096); } -ulong get_spin_addr(void) +ulong get_spin_phys_addr(void) { extern ulong __secondary_start_page; extern ulong __spin_table; - ulong addr = - (ulong)&__spin_table - (ulong)&__secondary_start_page; - addr += 0xfffff000; + return (determine_mp_bootpg() + + (ulong)&__spin_table - (ulong)&__secondary_start_page); +} + +ulong get_spin_virt_addr(void) +{ + extern ulong __secondary_start_page; + extern ulong __spin_table; - return addr; + return (CONFIG_BPTR_VIRT_ADDR + + (ulong)&__spin_table - (ulong)&__secondary_start_page); } #ifdef CONFIG_FSL_CORENET static void plat_mp_up(unsigned long bootpg) { u32 up, cpu_up_mask, whoami; - u32 *table = (u32 *)get_spin_addr(); + u32 *table = (u32 *)get_spin_virt_addr(); volatile ccsr_gur_t *gur; volatile ccsr_local_t *ccm; volatile ccsr_rcpm_t *rcpm; @@ -194,12 +200,23 @@ static void plat_mp_up(unsigned long bootpg) mtspr(SPRN_TBWU, 0); mtspr(SPRN_TBWL, 0); out_be32(&rcpm->ctbenrl, (1 << nr_cpus) - 1); + +#ifdef CONFIG_MPC8xxx_DISABLE_BPTR + /* + * Disabling Boot Page Translation allows the memory region 0xfffff000 + * to 0xffffffff to be used normally. Leaving Boot Page Translation + * enabled remaps 0xfffff000 to SDRAM which makes that memory region + * unusable for normal operation but it does allow OSes to easily + * reset a processor core to put it back into U-Boot's spinloop. + */ + clrbits_be32(&ecm->bptr, 0x80000000); +#endif } #else static void plat_mp_up(unsigned long bootpg) { u32 up, cpu_up_mask, whoami; - u32 *table = (u32 *)get_spin_addr(); + u32 *table = (u32 *)get_spin_virt_addr(); volatile u32 bpcr; volatile ccsr_local_ecm_t *ecm = (void *)(CONFIG_SYS_MPC85xx_ECM_ADDR); volatile ccsr_gur_t *gur = (void *)(CONFIG_SYS_MPC85xx_GUTS_ADDR); @@ -256,6 +273,17 @@ static void plat_mp_up(unsigned long bootpg) devdisr &= ~(MPC85xx_DEVDISR_TB0 | MPC85xx_DEVDISR_TB1); out_be32(&gur->devdisr, devdisr); + +#ifdef CONFIG_MPC8xxx_DISABLE_BPTR + /* + * Disabling Boot Page Translation allows the memory region 0xfffff000 + * to 0xffffffff to be used normally. Leaving Boot Page Translation + * enabled remaps 0xfffff000 to SDRAM which makes that memory region + * unusable for normal operation but it does allow OSes to easily + * reset a processor core to put it back into U-Boot's spinloop. + */ + clrbits_be32(&ecm->bptr, 0x80000000); +#endif } #endif @@ -269,33 +297,27 @@ void cpu_mp_lmb_reserve(struct lmb *lmb) void setup_mp(void) { extern ulong __secondary_start_page; + extern ulong __bootpg_addr; ulong fixup = (ulong)&__secondary_start_page; u32 bootpg = determine_mp_bootpg(); + /* Store the bootpg's SDRAM address for use by secondary CPU cores */ + __bootpg_addr = bootpg; + /* look for the tlb covering the reset page, there better be one */ - int i = find_tlb_idx((void *)0xfffff000, 1); + int i = find_tlb_idx((void *)CONFIG_BPTR_VIRT_ADDR, 1); /* we found a match */ if (i != -1) { /* map reset page to bootpg so we can copy code there */ disable_tlb(i); - set_tlb(1, 0xfffff000, bootpg, /* tlb, epn, rpn */ - MAS3_SX|MAS3_SW|MAS3_SR, MAS2_M, /* perms, wimge */ - 0, i, BOOKE_PAGESZ_4K, 1); /* ts, esel, tsize, iprot */ - - memcpy((void *)0xfffff000, (void *)fixup, 4096); - flush_cache(0xfffff000, 4096); - - disable_tlb(i); - - /* setup reset page back to 1:1, we'll use HW boot translation - * to map this where we want - */ - set_tlb(1, 0xfffff000, 0xfffff000, /* tlb, epn, rpn */ + set_tlb(1, CONFIG_BPTR_VIRT_ADDR, bootpg, /* tlb, epn, rpn */ MAS3_SX|MAS3_SW|MAS3_SR, MAS2_I, /* perms, wimge */ 0, i, BOOKE_PAGESZ_4K, 1); /* ts, esel, tsize, iprot */ + memcpy((void *)CONFIG_BPTR_VIRT_ADDR, (void *)fixup, 4096); + plat_mp_up(bootpg); } else { puts("WARNING: No reset page TLB. " diff --git a/cpu/mpc85xx/mp.h b/cpu/mpc85xx/mp.h index 2c2929eb0d..3422cc1070 100644 --- a/cpu/mpc85xx/mp.h +++ b/cpu/mpc85xx/mp.h @@ -3,7 +3,8 @@ #include -ulong get_spin_addr(void); +ulong get_spin_phys_addr(void); +ulong get_spin_virt_addr(void); u32 get_my_id(void); #define BOOT_ENTRY_ADDR_UPPER 0 diff --git a/cpu/mpc85xx/release.S b/cpu/mpc85xx/release.S index ecbd0d5857..a1ae78a7f5 100644 --- a/cpu/mpc85xx/release.S +++ b/cpu/mpc85xx/release.S @@ -138,23 +138,38 @@ __secondary_start_page: stw r3,ENTRY_R6_UPPER(r10) stw r3,ENTRY_R6_LOWER(r10) + /* load r13 with the address of the 'bootpg' in SDRAM */ + lis r13,toreset(__bootpg_addr)@h + ori r13,r13,toreset(__bootpg_addr)@l + lwz r13,0(r13) + /* setup mapping for AS = 1, and jump there */ lis r11,(MAS0_TLBSEL(1)|MAS0_ESEL(1))@h mtspr SPRN_MAS0,r11 lis r11,(MAS1_VALID|MAS1_IPROT)@h ori r11,r11,(MAS1_TS|MAS1_TSIZE(BOOKE_PAGESZ_4K))@l mtspr SPRN_MAS1,r11 - lis r11,(0xfffff000|MAS2_I)@h - ori r11,r11,(0xfffff000|MAS2_I)@l + oris r11,r13,(MAS2_I)@h + ori r11,r13,(MAS2_I)@l mtspr SPRN_MAS2,r11 - lis r11,(0xfffff000|MAS3_SX|MAS3_SW|MAS3_SR)@h - ori r11,r11,(0xfffff000|MAS3_SX|MAS3_SW|MAS3_SR)@l + oris r11,r13,(MAS3_SX|MAS3_SW|MAS3_SR)@h + ori r11,r13,(MAS3_SX|MAS3_SW|MAS3_SR)@l mtspr SPRN_MAS3,r11 tlbwe bl 1f 1: mflr r11 - addi r11,r11,28 + /* + * OR in 0xfff to create a mask of the bootpg SDRAM address. We use + * this mask to fixup the cpu spin table and the address that we want + * to jump to, eg change them from 0xfffffxxx to 0x7ffffxxx if the + * bootpg is at 0x7ffff000 in SDRAM. + */ + ori r13,r13,0xfff + and r11, r11, r13 + and r10, r10, r13 + + addi r11,r11,(2f-1b) mfmsr r13 ori r12,r13,MSR_IS|MSR_DS@l @@ -227,6 +242,15 @@ __secondary_start_page: mtspr SPRN_SRR1,r13 rfi + /* + * Allocate some space for the SDRAM address of the bootpg. + * This variable has to be in the boot page so that it can + * be accessed by secondary cores when they come out of reset. + */ + .globl __bootpg_addr +__bootpg_addr: + .long 0 + .align L1_CACHE_SHIFT .globl __spin_table __spin_table: diff --git a/include/asm-ppc/config.h b/include/asm-ppc/config.h index eba79010b1..af0853b0d7 100644 --- a/include/asm-ppc/config.h +++ b/include/asm-ppc/config.h @@ -47,6 +47,16 @@ #define CONFIG_MAX_CPUS 1 #endif +/* + * Provide a default boot page translation virtual address that lines up with + * Freescale's default e500 reset page. + */ +#if (defined(CONFIG_E500) && defined(CONFIG_MP)) +#ifndef CONFIG_BPTR_VIRT_ADDR +#define CONFIG_BPTR_VIRT_ADDR 0xfffff000 +#endif +#endif + /* Relocation to SDRAM works on all PPC boards */ #define CONFIG_RELOC_FIXUP_WORKS