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bc581770 LW |
1 | /* |
2 | * Copyright (C) 2008-2009 ST-Ericsson AB | |
3 | * License terms: GNU General Public License (GPL) version 2 | |
4 | * TCM memory handling for ARM systems | |
5 | * | |
6 | * Author: Linus Walleij <linus.walleij@stericsson.com> | |
7 | * Author: Rickard Andersson <rickard.andersson@stericsson.com> | |
8 | */ | |
9 | #include <linux/init.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/module.h> | |
12 | #include <linux/stddef.h> | |
13 | #include <linux/ioport.h> | |
14 | #include <linux/genalloc.h> | |
15 | #include <linux/string.h> /* memcpy */ | |
16 | #include <asm/page.h> /* PAGE_SHIFT */ | |
17 | #include <asm/cputype.h> | |
18 | #include <asm/mach/map.h> | |
19 | #include <mach/memory.h> | |
20 | #include "tcm.h" | |
21 | ||
22 | /* Scream and warn about misuse */ | |
23 | #if !defined(ITCM_OFFSET) || !defined(ITCM_END) || \ | |
24 | !defined(DTCM_OFFSET) || !defined(DTCM_END) | |
25 | #error "TCM support selected but offsets not defined!" | |
26 | #endif | |
27 | ||
28 | static struct gen_pool *tcm_pool; | |
29 | ||
30 | /* TCM section definitions from the linker */ | |
31 | extern char __itcm_start, __sitcm_text, __eitcm_text; | |
32 | extern char __dtcm_start, __sdtcm_data, __edtcm_data; | |
33 | ||
34 | /* | |
35 | * TCM memory resources | |
36 | */ | |
37 | static struct resource dtcm_res = { | |
38 | .name = "DTCM RAM", | |
39 | .start = DTCM_OFFSET, | |
40 | .end = DTCM_END, | |
41 | .flags = IORESOURCE_MEM | |
42 | }; | |
43 | ||
44 | static struct resource itcm_res = { | |
45 | .name = "ITCM RAM", | |
46 | .start = ITCM_OFFSET, | |
47 | .end = ITCM_END, | |
48 | .flags = IORESOURCE_MEM | |
49 | }; | |
50 | ||
51 | static struct map_desc dtcm_iomap[] __initdata = { | |
52 | { | |
53 | .virtual = DTCM_OFFSET, | |
54 | .pfn = __phys_to_pfn(DTCM_OFFSET), | |
55 | .length = (DTCM_END - DTCM_OFFSET + 1), | |
56 | .type = MT_UNCACHED | |
57 | } | |
58 | }; | |
59 | ||
60 | static struct map_desc itcm_iomap[] __initdata = { | |
61 | { | |
62 | .virtual = ITCM_OFFSET, | |
63 | .pfn = __phys_to_pfn(ITCM_OFFSET), | |
64 | .length = (ITCM_END - ITCM_OFFSET + 1), | |
65 | .type = MT_UNCACHED | |
66 | } | |
67 | }; | |
68 | ||
69 | /* | |
70 | * Allocate a chunk of TCM memory | |
71 | */ | |
72 | void *tcm_alloc(size_t len) | |
73 | { | |
74 | unsigned long vaddr; | |
75 | ||
76 | if (!tcm_pool) | |
77 | return NULL; | |
78 | ||
79 | vaddr = gen_pool_alloc(tcm_pool, len); | |
80 | if (!vaddr) | |
81 | return NULL; | |
82 | ||
83 | return (void *) vaddr; | |
84 | } | |
85 | EXPORT_SYMBOL(tcm_alloc); | |
86 | ||
87 | /* | |
88 | * Free a chunk of TCM memory | |
89 | */ | |
90 | void tcm_free(void *addr, size_t len) | |
91 | { | |
92 | gen_pool_free(tcm_pool, (unsigned long) addr, len); | |
93 | } | |
94 | EXPORT_SYMBOL(tcm_free); | |
95 | ||
96 | ||
97 | static void __init setup_tcm_bank(u8 type, u32 offset, u32 expected_size) | |
98 | { | |
99 | const int tcm_sizes[16] = { 0, -1, -1, 4, 8, 16, 32, 64, 128, | |
100 | 256, 512, 1024, -1, -1, -1, -1 }; | |
101 | u32 tcm_region; | |
102 | int tcm_size; | |
103 | ||
104 | /* Read the special TCM region register c9, 0 */ | |
105 | if (!type) | |
106 | asm("mrc p15, 0, %0, c9, c1, 0" | |
107 | : "=r" (tcm_region)); | |
108 | else | |
109 | asm("mrc p15, 0, %0, c9, c1, 1" | |
110 | : "=r" (tcm_region)); | |
111 | ||
112 | tcm_size = tcm_sizes[(tcm_region >> 2) & 0x0f]; | |
113 | if (tcm_size < 0) { | |
114 | pr_err("CPU: %sTCM of unknown size!\n", | |
115 | type ? "I" : "D"); | |
116 | } else { | |
117 | pr_info("CPU: found %sTCM %dk @ %08x, %senabled\n", | |
118 | type ? "I" : "D", | |
119 | tcm_size, | |
120 | (tcm_region & 0xfffff000U), | |
121 | (tcm_region & 1) ? "" : "not "); | |
122 | } | |
123 | ||
124 | if (tcm_size != expected_size) { | |
125 | pr_crit("CPU: %sTCM was detected %dk but expected %dk!\n", | |
126 | type ? "I" : "D", | |
127 | tcm_size, | |
128 | expected_size); | |
129 | /* Adjust to the expected size? what can we do... */ | |
130 | } | |
131 | ||
132 | /* Force move the TCM bank to where we want it, enable */ | |
133 | tcm_region = offset | (tcm_region & 0x00000ffeU) | 1; | |
134 | ||
135 | if (!type) | |
136 | asm("mcr p15, 0, %0, c9, c1, 0" | |
137 | : /* No output operands */ | |
138 | : "r" (tcm_region)); | |
139 | else | |
140 | asm("mcr p15, 0, %0, c9, c1, 1" | |
141 | : /* No output operands */ | |
142 | : "r" (tcm_region)); | |
143 | ||
144 | pr_debug("CPU: moved %sTCM %dk to %08x, enabled\n", | |
145 | type ? "I" : "D", | |
146 | tcm_size, | |
147 | (tcm_region & 0xfffff000U)); | |
148 | } | |
149 | ||
150 | /* | |
151 | * This initializes the TCM memory | |
152 | */ | |
153 | void __init tcm_init(void) | |
154 | { | |
155 | u32 tcm_status = read_cpuid_tcmstatus(); | |
156 | char *start; | |
157 | char *end; | |
158 | char *ram; | |
159 | ||
160 | /* Setup DTCM if present */ | |
161 | if (tcm_status & (1 << 16)) { | |
162 | setup_tcm_bank(0, DTCM_OFFSET, | |
163 | (DTCM_END - DTCM_OFFSET + 1) >> 10); | |
164 | request_resource(&iomem_resource, &dtcm_res); | |
165 | iotable_init(dtcm_iomap, 1); | |
166 | /* Copy data from RAM to DTCM */ | |
167 | start = &__sdtcm_data; | |
168 | end = &__edtcm_data; | |
169 | ram = &__dtcm_start; | |
170 | memcpy(start, ram, (end-start)); | |
171 | pr_debug("CPU DTCM: copied data from %p - %p\n", start, end); | |
172 | } | |
173 | ||
174 | /* Setup ITCM if present */ | |
175 | if (tcm_status & 1) { | |
176 | setup_tcm_bank(1, ITCM_OFFSET, | |
177 | (ITCM_END - ITCM_OFFSET + 1) >> 10); | |
178 | request_resource(&iomem_resource, &itcm_res); | |
179 | iotable_init(itcm_iomap, 1); | |
180 | /* Copy code from RAM to ITCM */ | |
181 | start = &__sitcm_text; | |
182 | end = &__eitcm_text; | |
183 | ram = &__itcm_start; | |
184 | memcpy(start, ram, (end-start)); | |
185 | pr_debug("CPU ITCM: copied code from %p - %p\n", start, end); | |
186 | } | |
187 | } | |
188 | ||
189 | /* | |
190 | * This creates the TCM memory pool and has to be done later, | |
191 | * during the core_initicalls, since the allocator is not yet | |
192 | * up and running when the first initialization runs. | |
193 | */ | |
194 | static int __init setup_tcm_pool(void) | |
195 | { | |
196 | u32 tcm_status = read_cpuid_tcmstatus(); | |
197 | u32 dtcm_pool_start = (u32) &__edtcm_data; | |
198 | u32 itcm_pool_start = (u32) &__eitcm_text; | |
199 | int ret; | |
200 | ||
201 | /* | |
202 | * Set up malloc pool, 2^2 = 4 bytes granularity since | |
203 | * the TCM is sometimes just 4 KiB. NB: pages and cache | |
204 | * line alignments does not matter in TCM! | |
205 | */ | |
206 | tcm_pool = gen_pool_create(2, -1); | |
207 | ||
208 | pr_debug("Setting up TCM memory pool\n"); | |
209 | ||
210 | /* Add the rest of DTCM to the TCM pool */ | |
211 | if (tcm_status & (1 << 16)) { | |
212 | if (dtcm_pool_start < DTCM_END) { | |
213 | ret = gen_pool_add(tcm_pool, dtcm_pool_start, | |
214 | DTCM_END - dtcm_pool_start + 1, -1); | |
215 | if (ret) { | |
216 | pr_err("CPU DTCM: could not add DTCM " \ | |
217 | "remainder to pool!\n"); | |
218 | return ret; | |
219 | } | |
220 | pr_debug("CPU DTCM: Added %08x bytes @ %08x to " \ | |
221 | "the TCM memory pool\n", | |
222 | DTCM_END - dtcm_pool_start + 1, | |
223 | dtcm_pool_start); | |
224 | } | |
225 | } | |
226 | ||
227 | /* Add the rest of ITCM to the TCM pool */ | |
228 | if (tcm_status & 1) { | |
229 | if (itcm_pool_start < ITCM_END) { | |
230 | ret = gen_pool_add(tcm_pool, itcm_pool_start, | |
231 | ITCM_END - itcm_pool_start + 1, -1); | |
232 | if (ret) { | |
233 | pr_err("CPU ITCM: could not add ITCM " \ | |
234 | "remainder to pool!\n"); | |
235 | return ret; | |
236 | } | |
237 | pr_debug("CPU ITCM: Added %08x bytes @ %08x to " \ | |
238 | "the TCM memory pool\n", | |
239 | ITCM_END - itcm_pool_start + 1, | |
240 | itcm_pool_start); | |
241 | } | |
242 | } | |
243 | return 0; | |
244 | } | |
245 | ||
246 | core_initcall(setup_tcm_pool); |