1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Common CPM code
4 *
5 * Author: Scott Wood <scottwood@freescale.com>
6 *
7 * Copyright 2007-2008,2010 Freescale Semiconductor, Inc.
8 *
9 * Some parts derived from commproc.c/cpm2_common.c, which is:
10 * Copyright (c) 1997 Dan error_act (dmalek@jlc.net)
11 * Copyright (c) 1999-2001 Dan Malek <dan@embeddedalley.com>
12 * Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com)
13 * 2006 (c) MontaVista Software, Inc.
14 * Vitaly Bordug <vbordug@ru.mvista.com>
15 */
16 #include <linux/genalloc.h>
17 #include <linux/init.h>
18 #include <linux/list.h>
19 #include <linux/spinlock.h>
20 #include <linux/export.h>
21 #include <linux/of.h>
22 #include <linux/of_address.h>
23 #include <linux/slab.h>
24 #include <linux/io.h>
25 #include <soc/fsl/qe/qe.h>
26
27 static struct gen_pool *muram_pool;
28 static DEFINE_SPINLOCK(cpm_muram_lock);
29 static void __iomem *muram_vbase;
30 static phys_addr_t muram_pbase;
31
32 struct muram_block {
33 struct list_head head;
34 s32 start;
35 int size;
36 };
37
38 static LIST_HEAD(muram_block_list);
39
40 /* max address size we deal with */
41 #define OF_MAX_ADDR_CELLS 4
42 #define GENPOOL_OFFSET (4096 * 8)
43
cpm_muram_init(void)44 int cpm_muram_init(void)
45 {
46 struct device_node *np;
47 struct resource r;
48 __be32 zero[OF_MAX_ADDR_CELLS] = {};
49 resource_size_t max = 0;
50 int i = 0;
51 int ret = 0;
52
53 if (muram_pbase)
54 return 0;
55
56 np = of_find_compatible_node(NULL, NULL, "fsl,cpm-muram-data");
57 if (!np) {
58 /* try legacy bindings */
59 np = of_find_node_by_name(NULL, "data-only");
60 if (!np) {
61 pr_err("Cannot find CPM muram data node");
62 ret = -ENODEV;
63 goto out_muram;
64 }
65 }
66
67 muram_pool = gen_pool_create(0, -1);
68 if (!muram_pool) {
69 pr_err("Cannot allocate memory pool for CPM/QE muram");
70 ret = -ENOMEM;
71 goto out_muram;
72 }
73 muram_pbase = of_translate_address(np, zero);
74 if (muram_pbase == (phys_addr_t)OF_BAD_ADDR) {
75 pr_err("Cannot translate zero through CPM muram node");
76 ret = -ENODEV;
77 goto out_pool;
78 }
79
80 while (of_address_to_resource(np, i++, &r) == 0) {
81 if (r.end > max)
82 max = r.end;
83 ret = gen_pool_add(muram_pool, r.start - muram_pbase +
84 GENPOOL_OFFSET, resource_size(&r), -1);
85 if (ret) {
86 pr_err("QE: couldn't add muram to pool!\n");
87 goto out_pool;
88 }
89 }
90
91 muram_vbase = ioremap(muram_pbase, max - muram_pbase + 1);
92 if (!muram_vbase) {
93 pr_err("Cannot map QE muram");
94 ret = -ENOMEM;
95 goto out_pool;
96 }
97 goto out_muram;
98 out_pool:
99 gen_pool_destroy(muram_pool);
100 out_muram:
101 of_node_put(np);
102 return ret;
103 }
104
105 /*
106 * cpm_muram_alloc_common - cpm_muram_alloc common code
107 * @size: number of bytes to allocate
108 * @algo: algorithm for alloc.
109 * @data: data for genalloc's algorithm.
110 *
111 * This function returns a non-negative offset into the muram area, or
112 * a negative errno on failure.
113 */
cpm_muram_alloc_common(unsigned long size,genpool_algo_t algo,void * data)114 static s32 cpm_muram_alloc_common(unsigned long size,
115 genpool_algo_t algo, void *data)
116 {
117 struct muram_block *entry;
118 s32 start;
119
120 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
121 if (!entry)
122 return -ENOMEM;
123 start = gen_pool_alloc_algo(muram_pool, size, algo, data);
124 if (!start) {
125 kfree(entry);
126 return -ENOMEM;
127 }
128 start = start - GENPOOL_OFFSET;
129 memset_io(cpm_muram_addr(start), 0, size);
130 entry->start = start;
131 entry->size = size;
132 list_add(&entry->head, &muram_block_list);
133
134 return start;
135 }
136
137 /*
138 * cpm_muram_alloc - allocate the requested size worth of multi-user ram
139 * @size: number of bytes to allocate
140 * @align: requested alignment, in bytes
141 *
142 * This function returns a non-negative offset into the muram area, or
143 * a negative errno on failure.
144 * Use cpm_dpram_addr() to get the virtual address of the area.
145 * Use cpm_muram_free() to free the allocation.
146 */
cpm_muram_alloc(unsigned long size,unsigned long align)147 s32 cpm_muram_alloc(unsigned long size, unsigned long align)
148 {
149 s32 start;
150 unsigned long flags;
151 struct genpool_data_align muram_pool_data;
152
153 spin_lock_irqsave(&cpm_muram_lock, flags);
154 muram_pool_data.align = align;
155 start = cpm_muram_alloc_common(size, gen_pool_first_fit_align,
156 &muram_pool_data);
157 spin_unlock_irqrestore(&cpm_muram_lock, flags);
158 return start;
159 }
160 EXPORT_SYMBOL(cpm_muram_alloc);
161
162 /**
163 * cpm_muram_free - free a chunk of multi-user ram
164 * @offset: The beginning of the chunk as returned by cpm_muram_alloc().
165 */
cpm_muram_free(s32 offset)166 void cpm_muram_free(s32 offset)
167 {
168 unsigned long flags;
169 int size;
170 struct muram_block *tmp;
171
172 if (offset < 0)
173 return;
174
175 size = 0;
176 spin_lock_irqsave(&cpm_muram_lock, flags);
177 list_for_each_entry(tmp, &muram_block_list, head) {
178 if (tmp->start == offset) {
179 size = tmp->size;
180 list_del(&tmp->head);
181 kfree(tmp);
182 break;
183 }
184 }
185 gen_pool_free(muram_pool, offset + GENPOOL_OFFSET, size);
186 spin_unlock_irqrestore(&cpm_muram_lock, flags);
187 }
188 EXPORT_SYMBOL(cpm_muram_free);
189
190 /*
191 * cpm_muram_alloc_fixed - reserve a specific region of multi-user ram
192 * @offset: offset of allocation start address
193 * @size: number of bytes to allocate
194 * This function returns @offset if the area was available, a negative
195 * errno otherwise.
196 * Use cpm_dpram_addr() to get the virtual address of the area.
197 * Use cpm_muram_free() to free the allocation.
198 */
cpm_muram_alloc_fixed(unsigned long offset,unsigned long size)199 s32 cpm_muram_alloc_fixed(unsigned long offset, unsigned long size)
200 {
201 s32 start;
202 unsigned long flags;
203 struct genpool_data_fixed muram_pool_data_fixed;
204
205 spin_lock_irqsave(&cpm_muram_lock, flags);
206 muram_pool_data_fixed.offset = offset + GENPOOL_OFFSET;
207 start = cpm_muram_alloc_common(size, gen_pool_fixed_alloc,
208 &muram_pool_data_fixed);
209 spin_unlock_irqrestore(&cpm_muram_lock, flags);
210 return start;
211 }
212 EXPORT_SYMBOL(cpm_muram_alloc_fixed);
213
214 /**
215 * cpm_muram_addr - turn a muram offset into a virtual address
216 * @offset: muram offset to convert
217 */
cpm_muram_addr(unsigned long offset)218 void __iomem *cpm_muram_addr(unsigned long offset)
219 {
220 return muram_vbase + offset;
221 }
222 EXPORT_SYMBOL(cpm_muram_addr);
223
cpm_muram_offset(const void __iomem * addr)224 unsigned long cpm_muram_offset(const void __iomem *addr)
225 {
226 return addr - muram_vbase;
227 }
228 EXPORT_SYMBOL(cpm_muram_offset);
229
230 /**
231 * cpm_muram_dma - turn a muram virtual address into a DMA address
232 * @addr: virtual address from cpm_muram_addr() to convert
233 */
cpm_muram_dma(void __iomem * addr)234 dma_addr_t cpm_muram_dma(void __iomem *addr)
235 {
236 return muram_pbase + (addr - muram_vbase);
237 }
238 EXPORT_SYMBOL(cpm_muram_dma);
239
240 /*
241 * As cpm_muram_free, but takes the virtual address rather than the
242 * muram offset.
243 */
cpm_muram_free_addr(const void __iomem * addr)244 void cpm_muram_free_addr(const void __iomem *addr)
245 {
246 if (!addr)
247 return;
248 cpm_muram_free(cpm_muram_offset(addr));
249 }
250 EXPORT_SYMBOL(cpm_muram_free_addr);
251