1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  */
4 #include <linux/fs.h>
5 #include <linux/fcntl.h>
6 #include <linux/memblock.h>
7 #include <linux/mm.h>
8 
9 #include <asm/bootinfo.h>
10 
11 #include <loongson.h>
12 #include <boot_param.h>
13 #include <mem.h>
14 #include <pci.h>
15 
16 #ifndef CONFIG_LEFI_FIRMWARE_INTERFACE
17 
18 u32 memsize, highmemsize;
19 
prom_init_memory(void)20 void __init prom_init_memory(void)
21 {
22 	add_memory_region(0x0, (memsize << 20), BOOT_MEM_RAM);
23 
24 	add_memory_region(memsize << 20, LOONGSON_PCI_MEM_START - (memsize <<
25 				20), BOOT_MEM_RESERVED);
26 
27 #ifdef CONFIG_CPU_SUPPORTS_ADDRWINCFG
28 	{
29 		int bit;
30 
31 		bit = fls(memsize + highmemsize);
32 		if (bit != ffs(memsize + highmemsize))
33 			bit += 20;
34 		else
35 			bit = bit + 20 - 1;
36 
37 		/* set cpu window3 to map CPU to DDR: 2G -> 2G */
38 		LOONGSON_ADDRWIN_CPUTODDR(ADDRWIN_WIN3, 0x80000000ul,
39 					  0x80000000ul, (1 << bit));
40 		mmiowb();
41 	}
42 #endif /* !CONFIG_CPU_SUPPORTS_ADDRWINCFG */
43 
44 #ifdef CONFIG_64BIT
45 	if (highmemsize > 0)
46 		add_memory_region(LOONGSON_HIGHMEM_START,
47 				  highmemsize << 20, BOOT_MEM_RAM);
48 
49 	add_memory_region(LOONGSON_PCI_MEM_END + 1, LOONGSON_HIGHMEM_START -
50 			  LOONGSON_PCI_MEM_END - 1, BOOT_MEM_RESERVED);
51 
52 #endif /* !CONFIG_64BIT */
53 }
54 
55 #else /* CONFIG_LEFI_FIRMWARE_INTERFACE */
56 
prom_init_memory(void)57 void __init prom_init_memory(void)
58 {
59 	int i;
60 	u32 node_id;
61 	u32 mem_type;
62 
63 	/* parse memory information */
64 	for (i = 0; i < loongson_memmap->nr_map; i++) {
65 		node_id = loongson_memmap->map[i].node_id;
66 		mem_type = loongson_memmap->map[i].mem_type;
67 
68 		if (node_id != 0)
69 			continue;
70 
71 		switch (mem_type) {
72 		case SYSTEM_RAM_LOW:
73 			memblock_add(loongson_memmap->map[i].mem_start,
74 				(u64)loongson_memmap->map[i].mem_size << 20);
75 			break;
76 		case SYSTEM_RAM_HIGH:
77 			memblock_add(loongson_memmap->map[i].mem_start,
78 				(u64)loongson_memmap->map[i].mem_size << 20);
79 			break;
80 		case SYSTEM_RAM_RESERVED:
81 			memblock_reserve(loongson_memmap->map[i].mem_start,
82 				(u64)loongson_memmap->map[i].mem_size << 20);
83 			break;
84 		}
85 	}
86 }
87 
88 #endif /* CONFIG_LEFI_FIRMWARE_INTERFACE */
89 
90 /* override of arch/mips/mm/cache.c: __uncached_access */
__uncached_access(struct file * file,unsigned long addr)91 int __uncached_access(struct file *file, unsigned long addr)
92 {
93 	if (file->f_flags & O_DSYNC)
94 		return 1;
95 
96 	return addr >= __pa(high_memory) ||
97 		((addr >= LOONGSON_MMIO_MEM_START) &&
98 		 (addr < LOONGSON_MMIO_MEM_END));
99 }
100 
101 #ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
102 
103 #include <linux/pci.h>
104 #include <linux/sched.h>
105 #include <asm/current.h>
106 
107 static unsigned long uca_start, uca_end;
108 
phys_mem_access_prot(struct file * file,unsigned long pfn,unsigned long size,pgprot_t vma_prot)109 pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
110 			      unsigned long size, pgprot_t vma_prot)
111 {
112 	unsigned long offset = pfn << PAGE_SHIFT;
113 	unsigned long end = offset + size;
114 
115 	if (__uncached_access(file, offset)) {
116 		if (uca_start && (offset >= uca_start) &&
117 		    (end <= uca_end))
118 			return __pgprot((pgprot_val(vma_prot) &
119 					 ~_CACHE_MASK) |
120 					_CACHE_UNCACHED_ACCELERATED);
121 		else
122 			return pgprot_noncached(vma_prot);
123 	}
124 	return vma_prot;
125 }
126 
find_vga_mem_init(void)127 static int __init find_vga_mem_init(void)
128 {
129 	struct pci_dev *dev = 0;
130 	struct resource *r;
131 	int idx;
132 
133 	if (uca_start)
134 		return 0;
135 
136 	for_each_pci_dev(dev) {
137 		if ((dev->class >> 16) == PCI_BASE_CLASS_DISPLAY) {
138 			for (idx = 0; idx < PCI_NUM_RESOURCES; idx++) {
139 				r = &dev->resource[idx];
140 				if (!r->start && r->end)
141 					continue;
142 				if (r->flags & IORESOURCE_IO)
143 					continue;
144 				if (r->flags & IORESOURCE_MEM) {
145 					uca_start = r->start;
146 					uca_end = r->end;
147 					return 0;
148 				}
149 			}
150 		}
151 	}
152 
153 	return 0;
154 }
155 
156 late_initcall(find_vga_mem_init);
157 #endif /* !CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED */
158