xref: /linux/drivers/soc/fsl/qe/qe_common.c (revision 03c305861c70d6db898dd2379b882e7772a5c5d0)
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 
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  */
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_muram_addr() to get the virtual address of the area.
145  * Use cpm_muram_free() to free the allocation.
146  */
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  */
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_muram_addr() to get the virtual address of the area.
197  * Use cpm_muram_free() to free the allocation.
198  */
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  */
218 void __iomem *cpm_muram_addr(unsigned long offset)
219 {
220 	return muram_vbase + offset;
221 }
222 EXPORT_SYMBOL(cpm_muram_addr);
223 
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  */
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  */
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