diff options
| author | Wu Zhangjin <wuzhangjin@gmail.com> | 2009-11-06 18:45:05 +0800 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2009-12-17 01:57:10 +0000 |
| commit | 6f7a251a259e5bf58a9ff334bdcfa3e42b6cb7a3 (patch) | |
| tree | f5b65babda54c52073819629cc0f1047b5d1b413 /arch/mips/loongson/common/mem.c | |
| parent | 937893cf5be53203eabc6f4db29f86b1fdeea203 (diff) | |
MIPS: Loongson: Add basic Loongson 2F support
Loongson 2F has built-in DDR2 and PCI-X controller. The PCI-X controller
has a programming interface similiar to the the FPGA northbridge used on
Loongson 2E.
The main differences between Loongson 2E and Loongson 2F include:
1. Loongson 2F has an extra address window configuration module, which
is used to map CPU address space to DDR or PCI address space, or map
the PCI-DMA address space to DDR or LIO address space.
2. Loongson 2F supports 8 levels of software configurable CPu frequency
which can be configured in the LOONGSON_CHIPCFG0 register. The coming
cpufreq and standby support are based on this feature.
Loongson.h abstracts the modules and corresponding methods are abstracted.
Add other Loongson-2F-specific source code including gcc 4.4 support, PCI
memory space, PCI IO space, DMA address.
Signed-off-by: Wu Zhangjin <wuzhangjin@gmail.com>
Cc: linux-mips@linux-mips.org
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/loongson/common/mem.c')
| -rw-r--r-- | arch/mips/loongson/common/mem.c | 33 |
1 files changed, 25 insertions, 8 deletions
diff --git a/arch/mips/loongson/common/mem.c b/arch/mips/loongson/common/mem.c index 3f7f153b197..e93551dbc9e 100644 --- a/arch/mips/loongson/common/mem.c +++ b/arch/mips/loongson/common/mem.c @@ -21,14 +21,31 @@ void __init prom_init_memory(void) add_memory_region(memsize << 20, LOONGSON_PCI_MEM_START - (memsize << 20), BOOT_MEM_RESERVED); #ifdef CONFIG_64BIT - if (highmemsize > 0) - add_memory_region(LOONGSON_HIGHMEM_START, - highmemsize << 20, BOOT_MEM_RAM); - - add_memory_region(LOONGSON_PCI_MEM_END + 1, LOONGSON_HIGHMEM_START - - LOONGSON_PCI_MEM_END - 1, BOOT_MEM_RESERVED); - -#endif /* CONFIG_64BIT */ +#ifdef CONFIG_CPU_LOONGSON2F + { + int bit; + + bit = fls(memsize + highmemsize); + if (bit != ffs(memsize + highmemsize)) + bit += 20; + else + bit = bit + 20 - 1; + + /* set cpu window3 to map CPU to DDR: 2G -> 2G */ + LOONGSON_ADDRWIN_CPUTODDR(ADDRWIN_WIN3, 0x80000000ul, + 0x80000000ul, (1 << bit)); + mmiowb(); + } +#endif /* CONFIG_CPU_LOONGSON2F */ + + if (highmemsize > 0) + add_memory_region(LOONGSON_HIGHMEM_START, + highmemsize << 20, BOOT_MEM_RAM); + + add_memory_region(LOONGSON_PCI_MEM_END + 1, LOONGSON_HIGHMEM_START - + LOONGSON_PCI_MEM_END - 1, BOOT_MEM_RESERVED); + +#endif /* CONFIG_64BIT */ } /* override of arch/mips/mm/cache.c: __uncached_access */ |