mirror of
https://github.com/openwrt/openwrt.git
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59 lines
1.9 KiB
Diff
59 lines
1.9 KiB
Diff
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--- a/arch/mips/ralink/mt7621.c
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+++ b/arch/mips/ralink/mt7621.c
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@@ -56,7 +56,9 @@
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#define MT7621_GPIO_MODE_SDHCI_SHIFT 18
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#define MT7621_GPIO_MODE_SDHCI_GPIO 1
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-static void *detect_magic __initdata = detect_memory_region;
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+#define MT7621_MEM_TEST_PATTERN 0xaa5555aa
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+
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+static u32 detect_magic __initdata;
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static struct rt2880_pmx_func uart1_grp[] = { FUNC("uart1", 0, 1, 2) };
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static struct rt2880_pmx_func i2c_grp[] = { FUNC("i2c", 0, 3, 2) };
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@@ -142,24 +144,32 @@ static struct clk *__init mt7621_add_sys
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return clk;
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}
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+static bool __init mt7621_addr_wraparound_test(phys_addr_t size)
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+{
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+ void *dm = (void *)KSEG1ADDR(&detect_magic);
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+ if (CPHYSADDR(dm + size) >= MT7621_LOWMEM_MAX_SIZE)
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+ return true;
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+ __raw_writel(MT7621_MEM_TEST_PATTERN, dm);
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+ if (__raw_readl(dm) != __raw_readl(dm + size))
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+ return false;
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+ __raw_writel(!MT7621_MEM_TEST_PATTERN, dm);
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+ return __raw_readl(dm) == __raw_readl(dm + size);
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+}
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+
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void __init mt7621_memory_detect(void)
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{
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- void *dm = &detect_magic;
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phys_addr_t size;
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- for (size = 32 * SZ_1M; size < 256 * SZ_1M; size <<= 1) {
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- if (!__builtin_memcmp(dm, dm + size, sizeof(detect_magic)))
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- break;
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+ for (size = 32 * SZ_1M; size <= 256 * SZ_1M; size <<= 1) {
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+ if (mt7621_addr_wraparound_test(size)) {
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+ memblock_add(MT7621_LOWMEM_BASE, size);
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+ return;
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+ }
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}
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- if ((size == 256 * SZ_1M) &&
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- (CPHYSADDR(dm + size) < MT7621_LOWMEM_MAX_SIZE) &&
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- __builtin_memcmp(dm, dm + size, sizeof(detect_magic))) {
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- memblock_add(MT7621_LOWMEM_BASE, MT7621_LOWMEM_MAX_SIZE);
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- memblock_add(MT7621_HIGHMEM_BASE, MT7621_HIGHMEM_SIZE);
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- } else {
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- memblock_add(MT7621_LOWMEM_BASE, size);
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- }
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+ /* addr doesn't wrap around at dm + 256M, assume 512M memory. */
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+ memblock_add(MT7621_LOWMEM_BASE, MT7621_LOWMEM_MAX_SIZE);
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+ memblock_add(MT7621_HIGHMEM_BASE, MT7621_HIGHMEM_SIZE);
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}
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void __init ralink_clk_init(void)
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