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167 lines
4.7 KiB
Diff
167 lines
4.7 KiB
Diff
From 6ee1d93455384cef8a0426effe85da241b525b63 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
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Date: Thu, 17 Jul 2014 23:26:33 +0200
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Subject: [PATCH 153/153] MIPS: BCM47XX: Detect more then 128 MiB of RAM
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(HIGHMEM)
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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So far BCM47XX can only detect amount of HIGHMEM. It still requires
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adding (registering) and well-testing before enabling by default.
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Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
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Acked-by: Hauke Mehrtens <hauke@hauke-m.de>
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Cc: linux-mips@linux-mips.org
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Patchwork: https://patchwork.linux-mips.org/patch/7396/
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Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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---
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arch/mips/bcm47xx/bcm47xx_private.h | 3 ++
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arch/mips/bcm47xx/prom.c | 68 ++++++++++++++++++++++++++++++++++++-
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arch/mips/bcm47xx/setup.c | 3 ++
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arch/mips/include/asm/pgtable-32.h | 2 ++
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arch/mips/mm/tlb-r4k.c | 2 +-
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5 files changed, 76 insertions(+), 2 deletions(-)
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--- a/arch/mips/bcm47xx/bcm47xx_private.h
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+++ b/arch/mips/bcm47xx/bcm47xx_private.h
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@@ -3,6 +3,9 @@
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#include <linux/kernel.h>
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+/* prom.c */
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+void __init bcm47xx_prom_highmem_init(void);
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+
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/* buttons.c */
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int __init bcm47xx_buttons_register(void);
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--- a/arch/mips/bcm47xx/prom.c
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+++ b/arch/mips/bcm47xx/prom.c
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@@ -51,6 +51,8 @@ __init void bcm47xx_set_system_type(u16
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chip_id);
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}
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+static unsigned long lowmem __initdata;
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+
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static __init void prom_init_mem(void)
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{
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unsigned long mem;
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@@ -84,6 +86,7 @@ static __init void prom_init_mem(void)
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if (!memcmp(prom_init, prom_init + mem, 32))
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break;
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}
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+ lowmem = mem;
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/* Ignoring the last page when ddr size is 128M. Cached
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* accesses to last page is causing the processor to prefetch
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@@ -92,7 +95,6 @@ static __init void prom_init_mem(void)
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*/
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if (c->cputype == CPU_74K && (mem == (128 << 20)))
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mem -= 0x1000;
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-
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add_memory_region(0, mem, BOOT_MEM_RAM);
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}
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@@ -111,3 +113,67 @@ void __init prom_init(void)
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void __init prom_free_prom_memory(void)
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{
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}
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+
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+#if defined(CONFIG_BCM47XX_BCMA) && defined(CONFIG_HIGHMEM)
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+
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+#define EXTVBASE 0xc0000000
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+#define ENTRYLO(x) ((pte_val(pfn_pte((x) >> _PFN_SHIFT, PAGE_KERNEL_UNCACHED)) >> 6) | 1)
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+
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+#include <asm/tlbflush.h>
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+
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+/* Stripped version of tlb_init, with the call to build_tlb_refill_handler
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+ * dropped. Calling it at this stage causes a hang.
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+ */
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+void __cpuinit early_tlb_init(void)
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+{
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+ write_c0_pagemask(PM_DEFAULT_MASK);
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+ write_c0_wired(0);
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+ temp_tlb_entry = current_cpu_data.tlbsize - 1;
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+ local_flush_tlb_all();
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+}
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+
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+void __init bcm47xx_prom_highmem_init(void)
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+{
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+ unsigned long off = (unsigned long)prom_init;
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+ unsigned long extmem = 0;
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+ bool highmem_region = false;
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+
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+ if (WARN_ON(bcm47xx_bus_type != BCM47XX_BUS_TYPE_BCMA))
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+ return;
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+
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+ if (bcm47xx_bus.bcma.bus.chipinfo.id == BCMA_CHIP_ID_BCM4706)
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+ highmem_region = true;
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+
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+ if (lowmem != 128 << 20 || !highmem_region)
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+ return;
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+
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+ early_tlb_init();
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+
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+ /* Add one temporary TLB entry to map SDRAM Region 2.
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+ * Physical Virtual
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+ * 0x80000000 0xc0000000 (1st: 256MB)
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+ * 0x90000000 0xd0000000 (2nd: 256MB)
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+ */
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+ add_temporary_entry(ENTRYLO(0x80000000),
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+ ENTRYLO(0x80000000 + (256 << 20)),
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+ EXTVBASE, PM_256M);
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+
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+ off = EXTVBASE + __pa(off);
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+ for (extmem = 128 << 20; extmem < 512 << 20; extmem <<= 1) {
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+ if (!memcmp(prom_init, (void *)(off + extmem), 16))
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+ break;
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+ }
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+ extmem -= lowmem;
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+
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+ early_tlb_init();
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+
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+ if (!extmem)
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+ return;
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+
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+ pr_warn("Found %lu MiB of extra memory, but highmem is unsupported yet!\n",
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+ extmem >> 20);
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+
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+ /* TODO: Register extra memory */
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+}
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+
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+#endif /* defined(CONFIG_BCM47XX_BCMA) && defined(CONFIG_HIGHMEM) */
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--- a/arch/mips/bcm47xx/setup.c
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+++ b/arch/mips/bcm47xx/setup.c
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@@ -223,6 +223,9 @@ void __init plat_mem_setup(void)
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bcm47xx_bus_type = BCM47XX_BUS_TYPE_BCMA;
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bcm47xx_register_bcma();
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bcm47xx_set_system_type(bcm47xx_bus.bcma.bus.chipinfo.id);
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+#ifdef CONFIG_HIGHMEM
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+ bcm47xx_prom_highmem_init();
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+#endif
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#endif
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} else {
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printk(KERN_INFO "bcm47xx: using ssb bus\n");
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--- a/arch/mips/include/asm/pgtable-32.h
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+++ b/arch/mips/include/asm/pgtable-32.h
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@@ -18,6 +18,8 @@
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#include <asm-generic/pgtable-nopmd.h>
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+extern int temp_tlb_entry __cpuinitdata;
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+
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/*
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* - add_temporary_entry() add a temporary TLB entry. We use TLB entries
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* starting at the top and working down. This is for populating the
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--- a/arch/mips/mm/tlb-r4k.c
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+++ b/arch/mips/mm/tlb-r4k.c
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@@ -395,7 +395,7 @@ int __init has_transparent_hugepage(void
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* lifetime of the system
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*/
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-static int temp_tlb_entry __cpuinitdata;
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+int temp_tlb_entry __cpuinitdata;
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__init int add_temporary_entry(unsigned long entrylo0, unsigned long entrylo1,
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unsigned long entryhi, unsigned long pagemask)
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