[linux-2.6-block.git] / arch / mips / loongson / common / mem.c

/*
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */
#include <linux/fs.h>
#include <linux/fcntl.h>
#include <linux/mm.h>

#include <asm/bootinfo.h>

#include <loongson.h>
#include <mem.h>
#include <pci.h>

void __init prom_init_memory(void)
{
	add_memory_region(0x0, (memsize << 20), BOOT_MEM_RAM);

	add_memory_region(memsize << 20, LOONGSON_PCI_MEM_START - (memsize <<
				20), BOOT_MEM_RESERVED);

#ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG
	{
		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_SUPPORTS_ADDRWINCFG */

#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 */
}

/* override of arch/mips/mm/cache.c: __uncached_access */
int __uncached_access(struct file *file, unsigned long addr)
{
	if (file->f_flags & O_DSYNC)
		return 1;

	return addr >= __pa(high_memory) ||
		((addr >= LOONGSON_MMIO_MEM_START) &&
		 (addr < LOONGSON_MMIO_MEM_END));
}

#ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED

#include <linux/pci.h>
#include <linux/sched.h>
#include <asm/current.h>

static unsigned long uca_start, uca_end;

pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
			      unsigned long size, pgprot_t vma_prot)
{
	unsigned long offset = pfn << PAGE_SHIFT;
	unsigned long end = offset + size;

	if (__uncached_access(file, offset)) {
		if (uca_start && (offset >= uca_start) &&
		    (end <= uca_end))
			return __pgprot((pgprot_val(vma_prot) &
					 ~_CACHE_MASK) |
					_CACHE_UNCACHED_ACCELERATED);
		else
			return pgprot_noncached(vma_prot);
	}
	return vma_prot;
}

static int __init find_vga_mem_init(void)
{
	struct pci_dev *dev = 0;
	struct resource *r;
	int idx;

	if (uca_start)
		return 0;

	for_each_pci_dev(dev) {
		if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
			for (idx = 0; idx < PCI_NUM_RESOURCES; idx++) {
				r = &dev->resource[idx];
				if (!r->start && r->end)
					continue;
				if (r->flags & IORESOURCE_IO)
					continue;
				if (r->flags & IORESOURCE_MEM) {
					uca_start = r->start;
					uca_end = r->end;
					return 0;
				}
			}
		}
	}

	return 0;
}

late_initcall(find_vga_mem_init);
#endif /* !CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED */
Commit	Line	Data
42d226c7 ST	1	/*
	2	* This program is free software; you can redistribute it and/or modify it
	3	* under the terms of the GNU General Public License as published by the
	4	* Free Software Foundation; either version 2 of the License, or (at your
	5	* option) any later version.
	6	*/
	7	#include <linux/fs.h>
	8	#include <linux/fcntl.h>
	9	#include <linux/mm.h>
	10
bd92aa01 WZ	11	#include <asm/bootinfo.h>
bd92aa01 WZ	12
5e983ff6	13	#include <loongson.h>
85749d24	14	#include <mem.h>
659da2ba	15	#include <pci.h>
bd92aa01 WZ	16
	17	void __init prom_init_memory(void)
	18	{
50549bda WZ	19	add_memory_region(0x0, (memsize << 20), BOOT_MEM_RAM);
	20
	21	add_memory_region(memsize << 20, LOONGSON_PCI_MEM_START - (memsize <<
	22	20), BOOT_MEM_RESERVED);
659da2ba	23
55045ff5	24	#ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG
6f7a251a WZ	25	{
	26	int bit;
	27
	28	bit = fls(memsize + highmemsize);
	29	if (bit != ffs(memsize + highmemsize))
	30	bit += 20;
	31	else
	32	bit = bit + 20 - 1;
	33
	34	/* set cpu window3 to map CPU to DDR: 2G -> 2G */
	35	LOONGSON_ADDRWIN_CPUTODDR(ADDRWIN_WIN3, 0x80000000ul,
	36	0x80000000ul, (1 << bit));
	37	mmiowb();
	38	}
55045ff5	39	#endif /* !CONFIG_CPU_SUPPORTS_ADDRWINCFG */
6f7a251a	40
55045ff5	41	#ifdef CONFIG_64BIT
6f7a251a WZ	42	if (highmemsize > 0)
	43	add_memory_region(LOONGSON_HIGHMEM_START,
	44	highmemsize << 20, BOOT_MEM_RAM);
	45
	46	add_memory_region(LOONGSON_PCI_MEM_END + 1, LOONGSON_HIGHMEM_START -
	47	LOONGSON_PCI_MEM_END - 1, BOOT_MEM_RESERVED);
	48
55045ff5	49	#endif /* !CONFIG_64BIT */
bd92aa01 WZ	50	}
bd92aa01 WZ	51
42d226c7 ST	52	/* override of arch/mips/mm/cache.c: __uncached_access */
	53	int __uncached_access(struct file *file, unsigned long addr)
	54	{
6b2f3d1f	55	if (file->f_flags & O_DSYNC)
42d226c7 ST	56	return 1;
42d226c7 ST	57
42d226c7	58	return addr >= __pa(high_memory) \|\|
85749d24 WZ	59	((addr >= LOONGSON_MMIO_MEM_START) &&
85749d24 WZ	60	(addr < LOONGSON_MMIO_MEM_END));
42d226c7	61	}
22f1fdfd WZ	62
	63	#ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
	64
	65	#include <linux/pci.h>
	66	#include <linux/sched.h>
	67	#include <asm/current.h>
	68
	69	static unsigned long uca_start, uca_end;
	70
	71	pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
	72	unsigned long size, pgprot_t vma_prot)
	73	{
	74	unsigned long offset = pfn << PAGE_SHIFT;
	75	unsigned long end = offset + size;
	76
	77	if (__uncached_access(file, offset)) {
514b6d0c	78	if (uca_start && (offset >= uca_start) &&
22f1fdfd WZ	79	(end <= uca_end))
	80	return __pgprot((pgprot_val(vma_prot) &
	81	~_CACHE_MASK) \|
	82	_CACHE_UNCACHED_ACCELERATED);
	83	else
	84	return pgprot_noncached(vma_prot);
	85	}
	86	return vma_prot;
	87	}
	88
	89	static int __init find_vga_mem_init(void)
	90	{
	91	struct pci_dev *dev = 0;
	92	struct resource *r;
	93	int idx;
	94
	95	if (uca_start)
	96	return 0;
	97
	98	for_each_pci_dev(dev) {
ff40ad72	99	if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
22f1fdfd WZ	100	for (idx = 0; idx < PCI_NUM_RESOURCES; idx++) {
	101	r = &dev->resource[idx];
	102	if (!r->start && r->end)
	103	continue;
	104	if (r->flags & IORESOURCE_IO)
	105	continue;
	106	if (r->flags & IORESOURCE_MEM) {
	107	uca_start = r->start;
	108	uca_end = r->end;
	109	return 0;
	110	}
	111	}
	112	}
	113	}
	114
	115	return 0;
	116	}
	117
	118	late_initcall(find_vga_mem_init);
	119	#endif /* !CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED */