6f7a251a25
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>
60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/fs.h>
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#include <linux/fcntl.h>
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#include <linux/mm.h>
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#include <asm/bootinfo.h>
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#include <loongson.h>
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#include <mem.h>
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#include <pci.h>
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void __init prom_init_memory(void)
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{
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add_memory_region(0x0, (memsize << 20), BOOT_MEM_RAM);
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add_memory_region(memsize << 20, LOONGSON_PCI_MEM_START - (memsize <<
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20), BOOT_MEM_RESERVED);
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#ifdef CONFIG_64BIT
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#ifdef CONFIG_CPU_LOONGSON2F
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{
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int bit;
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bit = fls(memsize + highmemsize);
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if (bit != ffs(memsize + highmemsize))
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bit += 20;
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else
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bit = bit + 20 - 1;
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/* set cpu window3 to map CPU to DDR: 2G -> 2G */
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LOONGSON_ADDRWIN_CPUTODDR(ADDRWIN_WIN3, 0x80000000ul,
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0x80000000ul, (1 << bit));
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mmiowb();
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}
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#endif /* CONFIG_CPU_LOONGSON2F */
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if (highmemsize > 0)
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add_memory_region(LOONGSON_HIGHMEM_START,
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highmemsize << 20, BOOT_MEM_RAM);
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add_memory_region(LOONGSON_PCI_MEM_END + 1, LOONGSON_HIGHMEM_START -
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LOONGSON_PCI_MEM_END - 1, BOOT_MEM_RESERVED);
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#endif /* CONFIG_64BIT */
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}
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/* override of arch/mips/mm/cache.c: __uncached_access */
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int __uncached_access(struct file *file, unsigned long addr)
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{
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if (file->f_flags & O_DSYNC)
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return 1;
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return addr >= __pa(high_memory) ||
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((addr >= LOONGSON_MMIO_MEM_START) &&
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(addr < LOONGSON_MMIO_MEM_END));
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}
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