diff options
Diffstat (limited to 'target/linux/brcm47xx/patches-3.14/153-MIPS-BCM47XX-Detect-more-then-128-MiB-of-RAM-HIGHMEM.patch')
| -rw-r--r-- | target/linux/brcm47xx/patches-3.14/153-MIPS-BCM47XX-Detect-more-then-128-MiB-of-RAM-HIGHMEM.patch | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/target/linux/brcm47xx/patches-3.14/153-MIPS-BCM47XX-Detect-more-then-128-MiB-of-RAM-HIGHMEM.patch b/target/linux/brcm47xx/patches-3.14/153-MIPS-BCM47XX-Detect-more-then-128-MiB-of-RAM-HIGHMEM.patch new file mode 100644 index 0000000000..ad0dd7de73 --- /dev/null +++ b/target/linux/brcm47xx/patches-3.14/153-MIPS-BCM47XX-Detect-more-then-128-MiB-of-RAM-HIGHMEM.patch @@ -0,0 +1,166 @@ +From 6ee1d93455384cef8a0426effe85da241b525b63 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com> +Date: Thu, 17 Jul 2014 23:26:33 +0200 +Subject: [PATCH 153/153] MIPS: BCM47XX: Detect more then 128 MiB of RAM + (HIGHMEM) +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +So far BCM47XX can only detect amount of HIGHMEM. It still requires +adding (registering) and well-testing before enabling by default. + +Signed-off-by: Rafał Miłecki <zajec5@gmail.com> +Acked-by: Hauke Mehrtens <hauke@hauke-m.de> +Cc: linux-mips@linux-mips.org +Patchwork: https://patchwork.linux-mips.org/patch/7396/ +Signed-off-by: Ralf Baechle <ralf@linux-mips.org> +--- + arch/mips/bcm47xx/bcm47xx_private.h | 3 ++ + arch/mips/bcm47xx/prom.c | 68 ++++++++++++++++++++++++++++++++++++- + arch/mips/bcm47xx/setup.c | 3 ++ + arch/mips/include/asm/pgtable-32.h | 2 ++ + arch/mips/mm/tlb-r4k.c | 2 +- + 5 files changed, 76 insertions(+), 2 deletions(-) + +--- a/arch/mips/bcm47xx/bcm47xx_private.h ++++ b/arch/mips/bcm47xx/bcm47xx_private.h +@@ -3,6 +3,9 @@ + + #include <linux/kernel.h> + ++/* prom.c */ ++void __init bcm47xx_prom_highmem_init(void); ++ + /* buttons.c */ + int __init bcm47xx_buttons_register(void); + +--- a/arch/mips/bcm47xx/prom.c ++++ b/arch/mips/bcm47xx/prom.c +@@ -51,6 +51,8 @@ __init void bcm47xx_set_system_type(u16 + chip_id); + } + ++static unsigned long lowmem __initdata; ++ + static __init void prom_init_mem(void) + { + unsigned long mem; +@@ -84,6 +86,7 @@ static __init void prom_init_mem(void) + if (!memcmp(prom_init, prom_init + mem, 32)) + break; + } ++ lowmem = mem; + + /* Ignoring the last page when ddr size is 128M. Cached + * accesses to last page is causing the processor to prefetch +@@ -92,7 +95,6 @@ static __init void prom_init_mem(void) + */ + if (c->cputype == CPU_74K && (mem == (128 << 20))) + mem -= 0x1000; +- + add_memory_region(0, mem, BOOT_MEM_RAM); + } + +@@ -111,3 +113,67 @@ void __init prom_init(void) + void __init prom_free_prom_memory(void) + { + } ++ ++#if defined(CONFIG_BCM47XX_BCMA) && defined(CONFIG_HIGHMEM) ++ ++#define EXTVBASE 0xc0000000 ++#define ENTRYLO(x) ((pte_val(pfn_pte((x) >> _PFN_SHIFT, PAGE_KERNEL_UNCACHED)) >> 6) | 1) ++ ++#include <asm/tlbflush.h> ++ ++/* Stripped version of tlb_init, with the call to build_tlb_refill_handler ++ * dropped. Calling it at this stage causes a hang. ++ */ ++void __cpuinit early_tlb_init(void) ++{ ++ write_c0_pagemask(PM_DEFAULT_MASK); ++ write_c0_wired(0); ++ temp_tlb_entry = current_cpu_data.tlbsize - 1; ++ local_flush_tlb_all(); ++} ++ ++void __init bcm47xx_prom_highmem_init(void) ++{ ++ unsigned long off = (unsigned long)prom_init; ++ unsigned long extmem = 0; ++ bool highmem_region = false; ++ ++ if (WARN_ON(bcm47xx_bus_type != BCM47XX_BUS_TYPE_BCMA)) ++ return; ++ ++ if (bcm47xx_bus.bcma.bus.chipinfo.id == BCMA_CHIP_ID_BCM4706) ++ highmem_region = true; ++ ++ if (lowmem != 128 << 20 || !highmem_region) ++ return; ++ ++ early_tlb_init(); ++ ++ /* Add one temporary TLB entry to map SDRAM Region 2. ++ * Physical Virtual ++ * 0x80000000 0xc0000000 (1st: 256MB) ++ * 0x90000000 0xd0000000 (2nd: 256MB) ++ */ ++ add_temporary_entry(ENTRYLO(0x80000000), ++ ENTRYLO(0x80000000 + (256 << 20)), ++ EXTVBASE, PM_256M); ++ ++ off = EXTVBASE + __pa(off); ++ for (extmem = 128 << 20; extmem < 512 << 20; extmem <<= 1) { ++ if (!memcmp(prom_init, (void *)(off + extmem), 16)) ++ break; ++ } ++ extmem -= lowmem; ++ ++ early_tlb_init(); ++ ++ if (!extmem) ++ return; ++ ++ pr_warn("Found %lu MiB of extra memory, but highmem is unsupported yet!\n", ++ extmem >> 20); ++ ++ /* TODO: Register extra memory */ ++} ++ ++#endif /* defined(CONFIG_BCM47XX_BCMA) && defined(CONFIG_HIGHMEM) */ +--- a/arch/mips/bcm47xx/setup.c ++++ b/arch/mips/bcm47xx/setup.c +@@ -218,6 +218,9 @@ void __init plat_mem_setup(void) + bcm47xx_bus_type = BCM47XX_BUS_TYPE_BCMA; + bcm47xx_register_bcma(); + bcm47xx_set_system_type(bcm47xx_bus.bcma.bus.chipinfo.id); ++#ifdef CONFIG_HIGHMEM ++ bcm47xx_prom_highmem_init(); ++#endif + #endif + } else { + printk(KERN_INFO "bcm47xx: using ssb bus\n"); +--- a/arch/mips/include/asm/pgtable-32.h ++++ b/arch/mips/include/asm/pgtable-32.h +@@ -18,6 +18,8 @@ + + #include <asm-generic/pgtable-nopmd.h> + ++extern int temp_tlb_entry __cpuinitdata; ++ + /* + * - add_temporary_entry() add a temporary TLB entry. We use TLB entries + * starting at the top and working down. This is for populating the +--- a/arch/mips/mm/tlb-r4k.c ++++ b/arch/mips/mm/tlb-r4k.c +@@ -417,7 +417,7 @@ int __init has_transparent_hugepage(void + * lifetime of the system + */ + +-static int temp_tlb_entry __cpuinitdata; ++int temp_tlb_entry __cpuinitdata; + + __init int add_temporary_entry(unsigned long entrylo0, unsigned long entrylo1, + unsigned long entryhi, unsigned long pagemask) |