1/*
2 * Copyright 2008-2015 Freescale Semiconductor Inc.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are met:
6 *     * Redistributions of source code must retain the above copyright
7 *       notice, this list of conditions and the following disclaimer.
8 *     * Redistributions in binary form must reproduce the above copyright
9 *       notice, this list of conditions and the following disclaimer in the
10 *       documentation and/or other materials provided with the distribution.
11 *     * Neither the name of Freescale Semiconductor nor the
12 *       names of its contributors may be used to endorse or promote products
13 *       derived from this software without specific prior written permission.
14 *
15 *
16 * ALTERNATIVELY, this software may be distributed under the terms of the
17 * GNU General Public License ("GPL") as published by the Free Software
18 * Foundation, either version 2 of that License or (at your option) any
19 * later version.
20 *
21 * THIS SOFTWARE IS PROVIDED BY Freescale Semiconductor ``AS IS'' AND ANY
22 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
23 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
24 * DISCLAIMED. IN NO EVENT SHALL Freescale Semiconductor BE LIABLE FOR ANY
25 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
26 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
28 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
30 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33#include "fman_muram.h"
34
35#include <linux/io.h>
36#include <linux/slab.h>
37#include <linux/genalloc.h>
38
39struct muram_info {
40	struct gen_pool *pool;
41	void __iomem *vbase;
42	size_t size;
43	phys_addr_t pbase;
44};
45
46static unsigned long fman_muram_vbase_to_offset(struct muram_info *muram,
47						unsigned long vaddr)
48{
49	return vaddr - (unsigned long)muram->vbase;
50}
51
52/**
53 * fman_muram_init
54 * @base:	Pointer to base of memory mapped FM-MURAM.
55 * @size:	Size of the FM-MURAM partition.
56 *
57 * Creates partition in the MURAM.
58 * The routine returns a pointer to the MURAM partition.
59 * This pointer must be passed as to all other FM-MURAM function calls.
60 * No actual initialization or configuration of FM_MURAM hardware is done by
61 * this routine.
62 *
63 * Return: pointer to FM-MURAM object, or NULL for Failure.
64 */
65struct muram_info *fman_muram_init(phys_addr_t base, size_t size)
66{
67	struct muram_info *muram;
68	void __iomem *vaddr;
69	int ret;
70
71	muram = kzalloc(sizeof(*muram), GFP_KERNEL);
72	if (!muram)
73		return NULL;
74
75	muram->pool = gen_pool_create(ilog2(64), -1);
76	if (!muram->pool) {
77		pr_err("%s(): MURAM pool create failed\n", __func__);
78		goto  muram_free;
79	}
80
81	vaddr = ioremap(base, size);
82	if (!vaddr) {
83		pr_err("%s(): MURAM ioremap failed\n", __func__);
84		goto pool_destroy;
85	}
86
87	ret = gen_pool_add_virt(muram->pool, (unsigned long)vaddr,
88				base, size, -1);
89	if (ret < 0) {
90		pr_err("%s(): MURAM pool add failed\n", __func__);
91		iounmap(vaddr);
92		goto pool_destroy;
93	}
94
95	memset_io(vaddr, 0, (int)size);
96
97	muram->vbase = vaddr;
98	muram->pbase = base;
99	return muram;
100
101pool_destroy:
102	gen_pool_destroy(muram->pool);
103muram_free:
104	kfree(muram);
105	return NULL;
106}
107
108/**
109 * fman_muram_offset_to_vbase
110 * @muram:	FM-MURAM module pointer.
111 * @offset:	the offset of the memory block
112 *
113 * Gives the address of the memory region from specific offset
114 *
115 * Return: The address of the memory block
116 */
117unsigned long fman_muram_offset_to_vbase(struct muram_info *muram,
118					 unsigned long offset)
119{
120	return offset + (unsigned long)muram->vbase;
121}
122
123/**
124 * fman_muram_alloc
125 * @muram:	FM-MURAM module pointer.
126 * @size:	Size of the memory to be allocated.
127 *
128 * Allocate some memory from FM-MURAM partition.
129 *
130 * Return: address of the allocated memory; NULL otherwise.
131 */
132unsigned long fman_muram_alloc(struct muram_info *muram, size_t size)
133{
134	unsigned long vaddr;
135
136	vaddr = gen_pool_alloc(muram->pool, size);
137	if (!vaddr)
138		return -ENOMEM;
139
140	memset_io((void __iomem *)vaddr, 0, size);
141
142	return fman_muram_vbase_to_offset(muram, vaddr);
143}
144
145/**
146 * fman_muram_free_mem
147 * @muram:	FM-MURAM module pointer.
148 * @offset:	offset of the memory region to be freed.
149 * @size:	size of the memory to be freed.
150 *
151 * Free an allocated memory from FM-MURAM partition.
152 */
153void fman_muram_free_mem(struct muram_info *muram, unsigned long offset,
154			 size_t size)
155{
156	unsigned long addr = fman_muram_offset_to_vbase(muram, offset);
157
158	gen_pool_free(muram->pool, addr, size);
159}
160