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hc
2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376 
 kernel/arch/mips/mm/ioremap.c
....@@ -14,90 +14,13 @@
1414 #include <linux/slab.h>
1515 #include <linux/vmalloc.h>
1616 #include <linux/mm_types.h>
17
+#include <linux/io.h>
1718 #include <asm/cacheflush.h>
18
-#include <asm/io.h>
1919 #include <asm/tlbflush.h>
20
+#include <ioremap.h>
2021 
21
-static inline void remap_area_pte(pte_t * pte, unsigned long address,
22
-	phys_addr_t size, phys_addr_t phys_addr, unsigned long flags)
23
-{
24
-	phys_addr_t end;
25
-	unsigned long pfn;
26
-	pgprot_t pgprot = __pgprot(_PAGE_GLOBAL | _PAGE_PRESENT | __READABLE
27
-				   | __WRITEABLE | flags);
28
-
29
-	address &= ~PMD_MASK;
30
-	end = address + size;
31
-	if (end > PMD_SIZE)
32
-		end = PMD_SIZE;
33
-	BUG_ON(address >= end);
34
-	pfn = phys_addr >> PAGE_SHIFT;
35
-	do {
36
-		if (!pte_none(*pte)) {
37
-			printk("remap_area_pte: page already exists\n");
38
-			BUG();
39
-		}
40
-		set_pte(pte, pfn_pte(pfn, pgprot));
41
-		address += PAGE_SIZE;
42
-		pfn++;
43
-		pte++;
44
-	} while (address && (address < end));
45
-}
46
-
47
-static inline int remap_area_pmd(pmd_t * pmd, unsigned long address,
48
-	phys_addr_t size, phys_addr_t phys_addr, unsigned long flags)
49
-{
50
-	phys_addr_t end;
51
-
52
-	address &= ~PGDIR_MASK;
53
-	end = address + size;
54
-	if (end > PGDIR_SIZE)
55
-		end = PGDIR_SIZE;
56
-	phys_addr -= address;
57
-	BUG_ON(address >= end);
58
-	do {
59
-		pte_t * pte = pte_alloc_kernel(pmd, address);
60
-		if (!pte)
61
-			return -ENOMEM;
62
-		remap_area_pte(pte, address, end - address, address + phys_addr, flags);
63
-		address = (address + PMD_SIZE) & PMD_MASK;
64
-		pmd++;
65
-	} while (address && (address < end));
66
-	return 0;
67
-}
68
-
69
-static int remap_area_pages(unsigned long address, phys_addr_t phys_addr,
70
-	phys_addr_t size, unsigned long flags)
71
-{
72
-	int error;
73
-	pgd_t * dir;
74
-	unsigned long end = address + size;
75
-
76
-	phys_addr -= address;
77
-	dir = pgd_offset(&init_mm, address);
78
-	flush_cache_all();
79
-	BUG_ON(address >= end);
80
-	do {
81
-		pud_t *pud;
82
-		pmd_t *pmd;
83
-
84
-		error = -ENOMEM;
85
-		pud = pud_alloc(&init_mm, dir, address);
86
-		if (!pud)
87
-			break;
88
-		pmd = pmd_alloc(&init_mm, pud, address);
89
-		if (!pmd)
90
-			break;
91
-		if (remap_area_pmd(pmd, address, end - address,
92
-					 phys_addr + address, flags))
93
-			break;
94
-		error = 0;
95
-		address = (address + PGDIR_SIZE) & PGDIR_MASK;
96
-		dir++;
97
-	} while (address && (address < end));
98
-	flush_tlb_all();
99
-	return error;
100
-}
22
+#define IS_LOW512(addr) (!((phys_addr_t)(addr) & (phys_addr_t) ~0x1fffffffULL))
23
+#define IS_KSEG1(addr) (((unsigned long)(addr) & ~0x1fffffffUL) == CKSEG1)
10124 
10225 static int __ioremap_check_ram(unsigned long start_pfn, unsigned long nr_pages,
10326 			       void *arg)
....@@ -114,27 +37,25 @@
11437 }
11538 
11639 /*
117
- * Generic mapping function (not visible outside):
118
- */
119
-
120
-/*
121
- * Remap an arbitrary physical address space into the kernel virtual
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- * address space. Needed when the kernel wants to access high addresses
123
- * directly.
40
+ * ioremap_prot     -   map bus memory into CPU space
41
+ * @phys_addr:    bus address of the memory
42
+ * @size:      size of the resource to map
12443  *
125
- * NOTE! We need to allow non-page-aligned mappings too: we will obviously
126
- * have to convert them into an offset in a page-aligned mapping, but the
127
- * caller shouldn't need to know that small detail.
44
+ * ioremap_prot gives the caller control over cache coherency attributes (CCA)
12845  */
129
-
130
-#define IS_LOW512(addr) (!((phys_addr_t)(addr) & (phys_addr_t) ~0x1fffffffULL))
131
-
132
-void __iomem * __ioremap(phys_addr_t phys_addr, phys_addr_t size, unsigned long flags)
46
+void __iomem *ioremap_prot(phys_addr_t phys_addr, unsigned long size,
47
+		unsigned long prot_val)
13348 {
49
+	unsigned long flags = prot_val & _CACHE_MASK;
13450 	unsigned long offset, pfn, last_pfn;
135
-	struct vm_struct * area;
51
+	struct vm_struct *area;
13652 	phys_addr_t last_addr;
137
-	void * addr;
53
+	unsigned long vaddr;
54
+	void __iomem *cpu_addr;
55
+
56
+	cpu_addr = plat_ioremap(phys_addr, size, flags);
57
+	if (cpu_addr)
58
+		return cpu_addr;
13859 
13960 	phys_addr = fixup_bigphys_addr(phys_addr, size);
14061 
....@@ -177,30 +98,22 @@
17798 	area = get_vm_area(size, VM_IOREMAP);
17899 	if (!area)
179100 		return NULL;
180
-	addr = area->addr;
181
-	if (remap_area_pages((unsigned long) addr, phys_addr, size, flags)) {
182
-		vunmap(addr);
101
+	vaddr = (unsigned long)area->addr;
102
+
103
+	flags |= _PAGE_GLOBAL | _PAGE_PRESENT | __READABLE | __WRITEABLE;
104
+	if (ioremap_page_range(vaddr, vaddr + size, phys_addr,
105
+			__pgprot(flags))) {
106
+		free_vm_area(area);
183107 		return NULL;
184108 	}
185109 
186
-	return (void __iomem *) (offset + (char *)addr);
110
+	return (void __iomem *)(vaddr + offset);
187111 }
112
+EXPORT_SYMBOL(ioremap_prot);
188113 
189
-#define IS_KSEG1(addr) (((unsigned long)(addr) & ~0x1fffffffUL) == CKSEG1)
190
-
191
-void __iounmap(const volatile void __iomem *addr)
114
+void iounmap(const volatile void __iomem *addr)
192115 {
193
-	struct vm_struct *p;
194
-
195
-	if (IS_KSEG1(addr))
196
-		return;
197
-
198
-	p = remove_vm_area((void *) (PAGE_MASK & (unsigned long __force) addr));
199
-	if (!p)
200
-		printk(KERN_ERR "iounmap: bad address %p\n", addr);
201
-
202
-	kfree(p);
116
+	if (!plat_iounmap(addr) && !IS_KSEG1(addr))
117
+		vunmap((void *)((unsigned long)addr & PAGE_MASK));
203118 }
204
-
205
-EXPORT_SYMBOL(__ioremap);
206
-EXPORT_SYMBOL(__iounmap);
119
+EXPORT_SYMBOL(iounmap);