1 // SPDX-License-Identifier: GPL-2.0
2
3 #include <linux/highmem.h>
4 #include <linux/genalloc.h>
5 #include <asm/tlbflush.h>
6 #include <asm/fixmap.h>
7
8 #if (CONFIG_ITCM_RAM_BASE == 0xffffffff)
9 #error "You should define ITCM_RAM_BASE"
10 #endif
11
12 #ifdef CONFIG_HAVE_DTCM
13 #if (CONFIG_DTCM_RAM_BASE == 0xffffffff)
14 #error "You should define DTCM_RAM_BASE"
15 #endif
16
17 #if (CONFIG_DTCM_RAM_BASE == CONFIG_ITCM_RAM_BASE)
18 #error "You should define correct DTCM_RAM_BASE"
19 #endif
20 #endif
21
22 extern char __tcm_start, __tcm_end, __dtcm_start;
23
24 static struct gen_pool *tcm_pool;
25
tcm_mapping_init(void)26 static void __init tcm_mapping_init(void)
27 {
28 pte_t *tcm_pte;
29 unsigned long vaddr, paddr;
30 int i;
31
32 paddr = CONFIG_ITCM_RAM_BASE;
33
34 if (pfn_valid(PFN_DOWN(CONFIG_ITCM_RAM_BASE)))
35 goto panic;
36
37 #ifndef CONFIG_HAVE_DTCM
38 for (i = 0; i < TCM_NR_PAGES; i++) {
39 #else
40 for (i = 0; i < CONFIG_ITCM_NR_PAGES; i++) {
41 #endif
42 vaddr = __fix_to_virt(FIX_TCM - i);
43
44 tcm_pte =
45 pte_offset_kernel((pmd_t *)pgd_offset_k(vaddr), vaddr);
46
47 set_pte(tcm_pte, pfn_pte(__phys_to_pfn(paddr), PAGE_KERNEL));
48
49 flush_tlb_one(vaddr);
50
51 paddr = paddr + PAGE_SIZE;
52 }
53
54 #ifdef CONFIG_HAVE_DTCM
55 if (pfn_valid(PFN_DOWN(CONFIG_DTCM_RAM_BASE)))
56 goto panic;
57
58 paddr = CONFIG_DTCM_RAM_BASE;
59
60 for (i = 0; i < CONFIG_DTCM_NR_PAGES; i++) {
61 vaddr = __fix_to_virt(FIX_TCM - CONFIG_ITCM_NR_PAGES - i);
62
63 tcm_pte =
64 pte_offset_kernel((pmd_t *) pgd_offset_k(vaddr), vaddr);
65
66 set_pte(tcm_pte, pfn_pte(__phys_to_pfn(paddr), PAGE_KERNEL));
67
68 flush_tlb_one(vaddr);
69
70 paddr = paddr + PAGE_SIZE;
71 }
72 #endif
73
74 #ifndef CONFIG_HAVE_DTCM
75 memcpy((void *)__fix_to_virt(FIX_TCM),
76 &__tcm_start, &__tcm_end - &__tcm_start);
77
78 pr_info("%s: mapping tcm va:0x%08lx to pa:0x%08x\n",
79 __func__, __fix_to_virt(FIX_TCM), CONFIG_ITCM_RAM_BASE);
80
81 pr_info("%s: __tcm_start va:0x%08lx size:%d\n",
82 __func__, (unsigned long)&__tcm_start, &__tcm_end - &__tcm_start);
83 #else
84 memcpy((void *)__fix_to_virt(FIX_TCM),
85 &__tcm_start, &__dtcm_start - &__tcm_start);
86
87 pr_info("%s: mapping itcm va:0x%08lx to pa:0x%08x\n",
88 __func__, __fix_to_virt(FIX_TCM), CONFIG_ITCM_RAM_BASE);
89
90 pr_info("%s: __itcm_start va:0x%08lx size:%d\n",
91 __func__, (unsigned long)&__tcm_start, &__dtcm_start - &__tcm_start);
92
93 memcpy((void *)__fix_to_virt(FIX_TCM - CONFIG_ITCM_NR_PAGES),
94 &__dtcm_start, &__tcm_end - &__dtcm_start);
95
96 pr_info("%s: mapping dtcm va:0x%08lx to pa:0x%08x\n",
97 __func__, __fix_to_virt(FIX_TCM - CONFIG_ITCM_NR_PAGES),
98 CONFIG_DTCM_RAM_BASE);
99
100 pr_info("%s: __dtcm_start va:0x%08lx size:%d\n",
101 __func__, (unsigned long)&__dtcm_start, &__tcm_end - &__dtcm_start);
102
103 #endif
104 return;
105 panic:
106 panic("TCM init error");
107 }
108
109 void *tcm_alloc(size_t len)
110 {
111 unsigned long vaddr;
112
113 if (!tcm_pool)
114 return NULL;
115
116 vaddr = gen_pool_alloc(tcm_pool, len);
117 if (!vaddr)
118 return NULL;
119
120 return (void *) vaddr;
121 }
122 EXPORT_SYMBOL(tcm_alloc);
123
124 void tcm_free(void *addr, size_t len)
125 {
126 gen_pool_free(tcm_pool, (unsigned long) addr, len);
127 }
128 EXPORT_SYMBOL(tcm_free);
129
130 static int __init tcm_setup_pool(void)
131 {
132 #ifndef CONFIG_HAVE_DTCM
133 u32 pool_size = (u32) (TCM_NR_PAGES * PAGE_SIZE)
134 - (u32) (&__tcm_end - &__tcm_start);
135
136 u32 tcm_pool_start = __fix_to_virt(FIX_TCM)
137 + (u32) (&__tcm_end - &__tcm_start);
138 #else
139 u32 pool_size = (u32) (CONFIG_DTCM_NR_PAGES * PAGE_SIZE)
140 - (u32) (&__tcm_end - &__dtcm_start);
141
142 u32 tcm_pool_start = __fix_to_virt(FIX_TCM - CONFIG_ITCM_NR_PAGES)
143 + (u32) (&__tcm_end - &__dtcm_start);
144 #endif
145 int ret;
146
147 tcm_pool = gen_pool_create(2, -1);
148
149 ret = gen_pool_add(tcm_pool, tcm_pool_start, pool_size, -1);
150 if (ret) {
151 pr_err("%s: gen_pool add failed!\n", __func__);
152 return ret;
153 }
154
155 pr_info("%s: Added %d bytes @ 0x%08x to memory pool\n",
156 __func__, pool_size, tcm_pool_start);
157
158 return 0;
159 }
160
161 static int __init tcm_init(void)
162 {
163 tcm_mapping_init();
164
165 tcm_setup_pool();
166
167 return 0;
168 }
169 arch_initcall(tcm_init);
170