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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
c19d8248 VNHT |
2 | /* |
3 | * PowerPC 4xx OCM memory allocation support | |
4 | * | |
5 | * (C) Copyright 2009, Applied Micro Circuits Corporation | |
6 | * Victor Gallardo (vgallardo@amcc.com) | |
7 | * | |
8 | * See file CREDITS for list of people who contributed to this | |
9 | * project. | |
c19d8248 VNHT |
10 | */ |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/dma-mapping.h> | |
14 | #include <linux/of.h> | |
c11eede6 | 15 | #include <linux/of_address.h> |
c19d8248 VNHT |
16 | #include <asm/rheap.h> |
17 | #include <asm/ppc4xx_ocm.h> | |
18 | #include <linux/slab.h> | |
19 | #include <linux/debugfs.h> | |
20 | ||
21 | #define OCM_DISABLED 0 | |
22 | #define OCM_ENABLED 1 | |
23 | ||
24 | struct ocm_block { | |
25 | struct list_head list; | |
26 | void __iomem *addr; | |
27 | int size; | |
28 | const char *owner; | |
29 | }; | |
30 | ||
31 | /* non-cached or cached region */ | |
32 | struct ocm_region { | |
33 | phys_addr_t phys; | |
34 | void __iomem *virt; | |
35 | ||
36 | int memtotal; | |
37 | int memfree; | |
38 | ||
39 | rh_info_t *rh; | |
40 | struct list_head list; | |
41 | }; | |
42 | ||
43 | struct ocm_info { | |
44 | int index; | |
45 | int status; | |
46 | int ready; | |
47 | ||
48 | phys_addr_t phys; | |
49 | ||
50 | int alignment; | |
51 | int memtotal; | |
52 | int cache_size; | |
53 | ||
54 | struct ocm_region nc; /* non-cached region */ | |
55 | struct ocm_region c; /* cached region */ | |
56 | }; | |
57 | ||
58 | static struct ocm_info *ocm_nodes; | |
59 | static int ocm_count; | |
60 | ||
61 | static struct ocm_info *ocm_get_node(unsigned int index) | |
62 | { | |
63 | if (index >= ocm_count) { | |
64 | printk(KERN_ERR "PPC4XX OCM: invalid index"); | |
65 | return NULL; | |
66 | } | |
67 | ||
68 | return &ocm_nodes[index]; | |
69 | } | |
70 | ||
71 | static int ocm_free_region(struct ocm_region *ocm_reg, const void *addr) | |
72 | { | |
73 | struct ocm_block *blk, *tmp; | |
74 | unsigned long offset; | |
75 | ||
76 | if (!ocm_reg->virt) | |
77 | return 0; | |
78 | ||
79 | list_for_each_entry_safe(blk, tmp, &ocm_reg->list, list) { | |
80 | if (blk->addr == addr) { | |
81 | offset = addr - ocm_reg->virt; | |
82 | ocm_reg->memfree += blk->size; | |
83 | rh_free(ocm_reg->rh, offset); | |
84 | list_del(&blk->list); | |
85 | kfree(blk); | |
86 | return 1; | |
87 | } | |
88 | } | |
89 | ||
90 | return 0; | |
91 | } | |
92 | ||
93 | static void __init ocm_init_node(int count, struct device_node *node) | |
94 | { | |
95 | struct ocm_info *ocm; | |
96 | ||
97 | const unsigned int *cell_index; | |
98 | const unsigned int *cache_size; | |
99 | int len; | |
100 | ||
101 | struct resource rsrc; | |
c19d8248 VNHT |
102 | |
103 | ocm = ocm_get_node(count); | |
104 | ||
105 | cell_index = of_get_property(node, "cell-index", &len); | |
106 | if (!cell_index) { | |
107 | printk(KERN_ERR "PPC4XX OCM: missing cell-index property"); | |
108 | return; | |
109 | } | |
110 | ocm->index = *cell_index; | |
111 | ||
112 | if (of_device_is_available(node)) | |
113 | ocm->status = OCM_ENABLED; | |
114 | ||
115 | cache_size = of_get_property(node, "cached-region-size", &len); | |
116 | if (cache_size) | |
117 | ocm->cache_size = *cache_size; | |
118 | ||
119 | if (of_address_to_resource(node, 0, &rsrc)) { | |
120 | printk(KERN_ERR "PPC4XX OCM%d: could not get resource address\n", | |
121 | ocm->index); | |
122 | return; | |
123 | } | |
124 | ||
125 | ocm->phys = rsrc.start; | |
126 | ocm->memtotal = (rsrc.end - rsrc.start + 1); | |
127 | ||
128 | printk(KERN_INFO "PPC4XX OCM%d: %d Bytes (%s)\n", | |
129 | ocm->index, ocm->memtotal, | |
130 | (ocm->status == OCM_DISABLED) ? "disabled" : "enabled"); | |
131 | ||
132 | if (ocm->status == OCM_DISABLED) | |
133 | return; | |
134 | ||
135 | /* request region */ | |
136 | ||
137 | if (!request_mem_region(ocm->phys, ocm->memtotal, "ppc4xx_ocm")) { | |
138 | printk(KERN_ERR "PPC4XX OCM%d: could not request region\n", | |
139 | ocm->index); | |
140 | return; | |
141 | } | |
142 | ||
143 | /* Configure non-cached and cached regions */ | |
144 | ||
145 | ocm->nc.phys = ocm->phys; | |
146 | ocm->nc.memtotal = ocm->memtotal - ocm->cache_size; | |
147 | ocm->nc.memfree = ocm->nc.memtotal; | |
148 | ||
149 | ocm->c.phys = ocm->phys + ocm->nc.memtotal; | |
150 | ocm->c.memtotal = ocm->cache_size; | |
151 | ocm->c.memfree = ocm->c.memtotal; | |
152 | ||
153 | if (ocm->nc.memtotal == 0) | |
154 | ocm->nc.phys = 0; | |
155 | ||
156 | if (ocm->c.memtotal == 0) | |
157 | ocm->c.phys = 0; | |
158 | ||
159 | printk(KERN_INFO "PPC4XX OCM%d: %d Bytes (non-cached)\n", | |
160 | ocm->index, ocm->nc.memtotal); | |
161 | ||
162 | printk(KERN_INFO "PPC4XX OCM%d: %d Bytes (cached)\n", | |
163 | ocm->index, ocm->c.memtotal); | |
164 | ||
165 | /* ioremap the non-cached region */ | |
166 | if (ocm->nc.memtotal) { | |
c19d8248 | 167 | ocm->nc.virt = __ioremap(ocm->nc.phys, ocm->nc.memtotal, |
d0757237 | 168 | _PAGE_EXEC | pgprot_val(PAGE_KERNEL_NCG)); |
c19d8248 VNHT |
169 | |
170 | if (!ocm->nc.virt) { | |
171 | printk(KERN_ERR | |
172 | "PPC4XX OCM%d: failed to ioremap non-cached memory\n", | |
173 | ocm->index); | |
174 | ocm->nc.memfree = 0; | |
175 | return; | |
176 | } | |
177 | } | |
178 | ||
179 | /* ioremap the cached region */ | |
180 | ||
181 | if (ocm->c.memtotal) { | |
c19d8248 | 182 | ocm->c.virt = __ioremap(ocm->c.phys, ocm->c.memtotal, |
d0757237 | 183 | _PAGE_EXEC | pgprot_val(PAGE_KERNEL)); |
c19d8248 VNHT |
184 | |
185 | if (!ocm->c.virt) { | |
186 | printk(KERN_ERR | |
187 | "PPC4XX OCM%d: failed to ioremap cached memory\n", | |
188 | ocm->index); | |
189 | ocm->c.memfree = 0; | |
190 | return; | |
191 | } | |
192 | } | |
193 | ||
194 | /* Create Remote Heaps */ | |
195 | ||
196 | ocm->alignment = 4; /* default 4 byte alignment */ | |
197 | ||
198 | if (ocm->nc.virt) { | |
199 | ocm->nc.rh = rh_create(ocm->alignment); | |
200 | rh_attach_region(ocm->nc.rh, 0, ocm->nc.memtotal); | |
201 | } | |
202 | ||
203 | if (ocm->c.virt) { | |
204 | ocm->c.rh = rh_create(ocm->alignment); | |
205 | rh_attach_region(ocm->c.rh, 0, ocm->c.memtotal); | |
206 | } | |
207 | ||
208 | INIT_LIST_HEAD(&ocm->nc.list); | |
209 | INIT_LIST_HEAD(&ocm->c.list); | |
210 | ||
211 | ocm->ready = 1; | |
c19d8248 VNHT |
212 | } |
213 | ||
214 | static int ocm_debugfs_show(struct seq_file *m, void *v) | |
215 | { | |
216 | struct ocm_block *blk, *tmp; | |
217 | unsigned int i; | |
218 | ||
219 | for (i = 0; i < ocm_count; i++) { | |
220 | struct ocm_info *ocm = ocm_get_node(i); | |
221 | ||
222 | if (!ocm || !ocm->ready) | |
223 | continue; | |
224 | ||
225 | seq_printf(m, "PPC4XX OCM : %d\n", ocm->index); | |
fcf5036f | 226 | seq_printf(m, "PhysAddr : %pa\n", &(ocm->phys)); |
c19d8248 VNHT |
227 | seq_printf(m, "MemTotal : %d Bytes\n", ocm->memtotal); |
228 | seq_printf(m, "MemTotal(NC) : %d Bytes\n", ocm->nc.memtotal); | |
b52106a0 | 229 | seq_printf(m, "MemTotal(C) : %d Bytes\n\n", ocm->c.memtotal); |
c19d8248 | 230 | |
fcf5036f | 231 | seq_printf(m, "NC.PhysAddr : %pa\n", &(ocm->nc.phys)); |
c19d8248 VNHT |
232 | seq_printf(m, "NC.VirtAddr : 0x%p\n", ocm->nc.virt); |
233 | seq_printf(m, "NC.MemTotal : %d Bytes\n", ocm->nc.memtotal); | |
234 | seq_printf(m, "NC.MemFree : %d Bytes\n", ocm->nc.memfree); | |
235 | ||
236 | list_for_each_entry_safe(blk, tmp, &ocm->nc.list, list) { | |
237 | seq_printf(m, "NC.MemUsed : %d Bytes (%s)\n", | |
238 | blk->size, blk->owner); | |
239 | } | |
240 | ||
fcf5036f | 241 | seq_printf(m, "\nC.PhysAddr : %pa\n", &(ocm->c.phys)); |
c19d8248 VNHT |
242 | seq_printf(m, "C.VirtAddr : 0x%p\n", ocm->c.virt); |
243 | seq_printf(m, "C.MemTotal : %d Bytes\n", ocm->c.memtotal); | |
244 | seq_printf(m, "C.MemFree : %d Bytes\n", ocm->c.memfree); | |
245 | ||
246 | list_for_each_entry_safe(blk, tmp, &ocm->c.list, list) { | |
247 | seq_printf(m, "C.MemUsed : %d Bytes (%s)\n", | |
248 | blk->size, blk->owner); | |
249 | } | |
250 | ||
52930bc6 | 251 | seq_putc(m, '\n'); |
c19d8248 VNHT |
252 | } |
253 | ||
254 | return 0; | |
255 | } | |
256 | ||
257 | static int ocm_debugfs_open(struct inode *inode, struct file *file) | |
258 | { | |
259 | return single_open(file, ocm_debugfs_show, NULL); | |
260 | } | |
261 | ||
262 | static const struct file_operations ocm_debugfs_fops = { | |
263 | .open = ocm_debugfs_open, | |
264 | .read = seq_read, | |
265 | .llseek = seq_lseek, | |
266 | .release = single_release, | |
267 | }; | |
268 | ||
269 | static int ocm_debugfs_init(void) | |
270 | { | |
271 | struct dentry *junk; | |
272 | ||
273 | junk = debugfs_create_dir("ppc4xx_ocm", 0); | |
274 | if (!junk) { | |
275 | printk(KERN_ALERT "debugfs ppc4xx ocm: failed to create dir\n"); | |
276 | return -1; | |
277 | } | |
278 | ||
279 | if (debugfs_create_file("info", 0644, junk, NULL, &ocm_debugfs_fops)) { | |
280 | printk(KERN_ALERT "debugfs ppc4xx ocm: failed to create file\n"); | |
281 | return -1; | |
282 | } | |
283 | ||
284 | return 0; | |
285 | } | |
286 | ||
287 | void *ppc4xx_ocm_alloc(phys_addr_t *phys, int size, int align, | |
288 | int flags, const char *owner) | |
289 | { | |
290 | void __iomem *addr = NULL; | |
291 | unsigned long offset; | |
292 | struct ocm_info *ocm; | |
293 | struct ocm_region *ocm_reg; | |
294 | struct ocm_block *ocm_blk; | |
295 | int i; | |
296 | ||
297 | for (i = 0; i < ocm_count; i++) { | |
298 | ocm = ocm_get_node(i); | |
299 | ||
300 | if (!ocm || !ocm->ready) | |
301 | continue; | |
302 | ||
303 | if (flags == PPC4XX_OCM_NON_CACHED) | |
304 | ocm_reg = &ocm->nc; | |
305 | else | |
306 | ocm_reg = &ocm->c; | |
307 | ||
308 | if (!ocm_reg->virt) | |
309 | continue; | |
310 | ||
311 | if (align < ocm->alignment) | |
312 | align = ocm->alignment; | |
313 | ||
314 | offset = rh_alloc_align(ocm_reg->rh, size, align, NULL); | |
315 | ||
316 | if (IS_ERR_VALUE(offset)) | |
317 | continue; | |
318 | ||
a0828cf5 | 319 | ocm_blk = kzalloc(sizeof(*ocm_blk), GFP_KERNEL); |
c19d8248 | 320 | if (!ocm_blk) { |
c19d8248 VNHT |
321 | rh_free(ocm_reg->rh, offset); |
322 | break; | |
323 | } | |
324 | ||
325 | *phys = ocm_reg->phys + offset; | |
326 | addr = ocm_reg->virt + offset; | |
327 | size = ALIGN(size, align); | |
328 | ||
329 | ocm_blk->addr = addr; | |
330 | ocm_blk->size = size; | |
331 | ocm_blk->owner = owner; | |
332 | list_add_tail(&ocm_blk->list, &ocm_reg->list); | |
333 | ||
334 | ocm_reg->memfree -= size; | |
335 | ||
336 | break; | |
337 | } | |
338 | ||
339 | return addr; | |
340 | } | |
341 | ||
342 | void ppc4xx_ocm_free(const void *addr) | |
343 | { | |
344 | int i; | |
345 | ||
346 | if (!addr) | |
347 | return; | |
348 | ||
349 | for (i = 0; i < ocm_count; i++) { | |
350 | struct ocm_info *ocm = ocm_get_node(i); | |
351 | ||
352 | if (!ocm || !ocm->ready) | |
353 | continue; | |
354 | ||
355 | if (ocm_free_region(&ocm->nc, addr) || | |
356 | ocm_free_region(&ocm->c, addr)) | |
357 | return; | |
358 | } | |
359 | } | |
360 | ||
361 | static int __init ppc4xx_ocm_init(void) | |
362 | { | |
363 | struct device_node *np; | |
364 | int count; | |
365 | ||
366 | count = 0; | |
367 | for_each_compatible_node(np, NULL, "ibm,ocm") | |
368 | count++; | |
369 | ||
370 | if (!count) | |
371 | return 0; | |
372 | ||
373 | ocm_nodes = kzalloc((count * sizeof(struct ocm_info)), GFP_KERNEL); | |
a8d5dada | 374 | if (!ocm_nodes) |
c19d8248 | 375 | return -ENOMEM; |
c19d8248 VNHT |
376 | |
377 | ocm_count = count; | |
378 | count = 0; | |
379 | ||
380 | for_each_compatible_node(np, NULL, "ibm,ocm") { | |
381 | ocm_init_node(count, np); | |
382 | count++; | |
383 | } | |
384 | ||
385 | ocm_debugfs_init(); | |
386 | ||
387 | return 0; | |
388 | } | |
389 | ||
390 | arch_initcall(ppc4xx_ocm_init); |