summaryrefslogtreecommitdiff
path: root/drivers/soc/fsl/qe/qe_common.c
blob: 9729ce86db5918552b93df55ff2770526baee3ef (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
// SPDX-License-Identifier: GPL-2.0-only
/*
 * Common CPM code
 *
 * Author: Scott Wood <scottwood@freescale.com>
 *
 * Copyright 2007-2008,2010 Freescale Semiconductor, Inc.
 *
 * Some parts derived from commproc.c/cpm2_common.c, which is:
 * Copyright (c) 1997 Dan error_act (dmalek@jlc.net)
 * Copyright (c) 1999-2001 Dan Malek <dan@embeddedalley.com>
 * Copyright (c) 2000 MontaVista Software, Inc (source@mvista.com)
 * 2006 (c) MontaVista Software, Inc.
 * Vitaly Bordug <vbordug@ru.mvista.com>
 */
#include <linux/genalloc.h>
#include <linux/init.h>
#include <linux/list.h>
#include <linux/spinlock.h>
#include <linux/export.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <soc/fsl/qe/qe.h>

static struct gen_pool *muram_pool;
static DEFINE_SPINLOCK(cpm_muram_lock);
static void __iomem *muram_vbase;
static phys_addr_t muram_pbase;

struct muram_block {
	struct list_head head;
	s32 start;
	int size;
};

static LIST_HEAD(muram_block_list);

/* max address size we deal with */
#define OF_MAX_ADDR_CELLS	4
#define GENPOOL_OFFSET		(4096 * 8)

int cpm_muram_init(void)
{
	struct device_node *np;
	struct resource r;
	__be32 zero[OF_MAX_ADDR_CELLS] = {};
	resource_size_t max = 0;
	int i = 0;
	int ret = 0;

	if (muram_pbase)
		return 0;

	np = of_find_compatible_node(NULL, NULL, "fsl,cpm-muram-data");
	if (!np) {
		/* try legacy bindings */
		np = of_find_node_by_name(NULL, "data-only");
		if (!np) {
			pr_err("Cannot find CPM muram data node");
			ret = -ENODEV;
			goto out_muram;
		}
	}

	muram_pool = gen_pool_create(0, -1);
	if (!muram_pool) {
		pr_err("Cannot allocate memory pool for CPM/QE muram");
		ret = -ENOMEM;
		goto out_muram;
	}
	muram_pbase = of_translate_address(np, zero);
	if (muram_pbase == (phys_addr_t)OF_BAD_ADDR) {
		pr_err("Cannot translate zero through CPM muram node");
		ret = -ENODEV;
		goto out_pool;
	}

	while (of_address_to_resource(np, i++, &r) == 0) {
		if (r.end > max)
			max = r.end;
		ret = gen_pool_add(muram_pool, r.start - muram_pbase +
				   GENPOOL_OFFSET, resource_size(&r), -1);
		if (ret) {
			pr_err("QE: couldn't add muram to pool!\n");
			goto out_pool;
		}
	}

	muram_vbase = ioremap(muram_pbase, max - muram_pbase + 1);
	if (!muram_vbase) {
		pr_err("Cannot map QE muram");
		ret = -ENOMEM;
		goto out_pool;
	}
	goto out_muram;
out_pool:
	gen_pool_destroy(muram_pool);
out_muram:
	of_node_put(np);
	return ret;
}

/*
 * cpm_muram_alloc_common - cpm_muram_alloc common code
 * @size: number of bytes to allocate
 * @algo: algorithm for alloc.
 * @data: data for genalloc's algorithm.
 *
 * This function returns a non-negative offset into the muram area, or
 * a negative errno on failure.
 */
static s32 cpm_muram_alloc_common(unsigned long size,
				  genpool_algo_t algo, void *data)
{
	struct muram_block *entry;
	s32 start;

	entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
	if (!entry)
		return -ENOMEM;
	start = gen_pool_alloc_algo(muram_pool, size, algo, data);
	if (!start) {
		kfree(entry);
		return -ENOMEM;
	}
	start = start - GENPOOL_OFFSET;
	memset_io(cpm_muram_addr(start), 0, size);
	entry->start = start;
	entry->size = size;
	list_add(&entry->head, &muram_block_list);

	return start;
}

/*
 * cpm_muram_alloc - allocate the requested size worth of multi-user ram
 * @size: number of bytes to allocate
 * @align: requested alignment, in bytes
 *
 * This function returns a non-negative offset into the muram area, or
 * a negative errno on failure.
 * Use cpm_dpram_addr() to get the virtual address of the area.
 * Use cpm_muram_free() to free the allocation.
 */
s32 cpm_muram_alloc(unsigned long size, unsigned long align)
{
	s32 start;
	unsigned long flags;
	struct genpool_data_align muram_pool_data;

	spin_lock_irqsave(&cpm_muram_lock, flags);
	muram_pool_data.align = align;
	start = cpm_muram_alloc_common(size, gen_pool_first_fit_align,
				       &muram_pool_data);
	spin_unlock_irqrestore(&cpm_muram_lock, flags);
	return start;
}
EXPORT_SYMBOL(cpm_muram_alloc);

/**
 * cpm_muram_free - free a chunk of multi-user ram
 * @offset: The beginning of the chunk as returned by cpm_muram_alloc().
 */
void cpm_muram_free(s32 offset)
{
	unsigned long flags;
	int size;
	struct muram_block *tmp;

	if (offset < 0)
		return;

	size = 0;
	spin_lock_irqsave(&cpm_muram_lock, flags);
	list_for_each_entry(tmp, &muram_block_list, head) {
		if (tmp->start == offset) {
			size = tmp->size;
			list_del(&tmp->head);
			kfree(tmp);
			break;
		}
	}
	gen_pool_free(muram_pool, offset + GENPOOL_OFFSET, size);
	spin_unlock_irqrestore(&cpm_muram_lock, flags);
}
EXPORT_SYMBOL(cpm_muram_free);

/*
 * cpm_muram_alloc_fixed - reserve a specific region of multi-user ram
 * @offset: offset of allocation start address
 * @size: number of bytes to allocate
 * This function returns @offset if the area was available, a negative
 * errno otherwise.
 * Use cpm_dpram_addr() to get the virtual address of the area.
 * Use cpm_muram_free() to free the allocation.
 */
s32 cpm_muram_alloc_fixed(unsigned long offset, unsigned long size)
{
	s32 start;
	unsigned long flags;
	struct genpool_data_fixed muram_pool_data_fixed;

	spin_lock_irqsave(&cpm_muram_lock, flags);
	muram_pool_data_fixed.offset = offset + GENPOOL_OFFSET;
	start = cpm_muram_alloc_common(size, gen_pool_fixed_alloc,
				       &muram_pool_data_fixed);
	spin_unlock_irqrestore(&cpm_muram_lock, flags);
	return start;
}
EXPORT_SYMBOL(cpm_muram_alloc_fixed);

/**
 * cpm_muram_addr - turn a muram offset into a virtual address
 * @offset: muram offset to convert
 */
void __iomem *cpm_muram_addr(unsigned long offset)
{
	return muram_vbase + offset;
}
EXPORT_SYMBOL(cpm_muram_addr);

unsigned long cpm_muram_offset(const void __iomem *addr)
{
	return addr - muram_vbase;
}
EXPORT_SYMBOL(cpm_muram_offset);

/**
 * cpm_muram_dma - turn a muram virtual address into a DMA address
 * @addr: virtual address from cpm_muram_addr() to convert
 */
dma_addr_t cpm_muram_dma(void __iomem *addr)
{
	return muram_pbase + (addr - muram_vbase);
}
EXPORT_SYMBOL(cpm_muram_dma);

/*
 * As cpm_muram_free, but takes the virtual address rather than the
 * muram offset.
 */
void cpm_muram_free_addr(const void __iomem *addr)
{
	if (!addr)
		return;
	cpm_muram_free(cpm_muram_offset(addr));
}
EXPORT_SYMBOL(cpm_muram_free_addr);