1 // SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0-or-later
2 /*
3 * Copyright 2008 - 2015 Freescale Semiconductor Inc.
4 */
5
6 #include "fman_muram.h"
7
8 #include <linux/io.h>
9 #include <linux/slab.h>
10 #include <linux/genalloc.h>
11
12 struct muram_info {
13 struct gen_pool *pool;
14 void __iomem *vbase;
15 size_t size;
16 phys_addr_t pbase;
17 };
18
fman_muram_vbase_to_offset(struct muram_info * muram,unsigned long vaddr)19 static unsigned long fman_muram_vbase_to_offset(struct muram_info *muram,
20 unsigned long vaddr)
21 {
22 return vaddr - (unsigned long)muram->vbase;
23 }
24
25 /**
26 * fman_muram_init
27 * @base: Pointer to base of memory mapped FM-MURAM.
28 * @size: Size of the FM-MURAM partition.
29 *
30 * Creates partition in the MURAM.
31 * The routine returns a pointer to the MURAM partition.
32 * This pointer must be passed as to all other FM-MURAM function calls.
33 * No actual initialization or configuration of FM_MURAM hardware is done by
34 * this routine.
35 *
36 * Return: pointer to FM-MURAM object, or NULL for Failure.
37 */
fman_muram_init(phys_addr_t base,size_t size)38 struct muram_info *fman_muram_init(phys_addr_t base, size_t size)
39 {
40 struct muram_info *muram;
41 void __iomem *vaddr;
42 int ret;
43
44 muram = kzalloc(sizeof(*muram), GFP_KERNEL);
45 if (!muram)
46 return NULL;
47
48 muram->pool = gen_pool_create(ilog2(64), -1);
49 if (!muram->pool) {
50 pr_err("%s(): MURAM pool create failed\n", __func__);
51 goto muram_free;
52 }
53
54 vaddr = ioremap(base, size);
55 if (!vaddr) {
56 pr_err("%s(): MURAM ioremap failed\n", __func__);
57 goto pool_destroy;
58 }
59
60 ret = gen_pool_add_virt(muram->pool, (unsigned long)vaddr,
61 base, size, -1);
62 if (ret < 0) {
63 pr_err("%s(): MURAM pool add failed\n", __func__);
64 iounmap(vaddr);
65 goto pool_destroy;
66 }
67
68 memset_io(vaddr, 0, (int)size);
69
70 muram->vbase = vaddr;
71 muram->pbase = base;
72 return muram;
73
74 pool_destroy:
75 gen_pool_destroy(muram->pool);
76 muram_free:
77 kfree(muram);
78 return NULL;
79 }
80
81 /**
82 * fman_muram_offset_to_vbase
83 * @muram: FM-MURAM module pointer.
84 * @offset: the offset of the memory block
85 *
86 * Gives the address of the memory region from specific offset
87 *
88 * Return: The address of the memory block
89 */
fman_muram_offset_to_vbase(struct muram_info * muram,unsigned long offset)90 unsigned long fman_muram_offset_to_vbase(struct muram_info *muram,
91 unsigned long offset)
92 {
93 return offset + (unsigned long)muram->vbase;
94 }
95
96 /**
97 * fman_muram_alloc
98 * @muram: FM-MURAM module pointer.
99 * @size: Size of the memory to be allocated.
100 *
101 * Allocate some memory from FM-MURAM partition.
102 *
103 * Return: address of the allocated memory; NULL otherwise.
104 */
fman_muram_alloc(struct muram_info * muram,size_t size)105 unsigned long fman_muram_alloc(struct muram_info *muram, size_t size)
106 {
107 unsigned long vaddr;
108
109 vaddr = gen_pool_alloc(muram->pool, size);
110 if (!vaddr)
111 return -ENOMEM;
112
113 memset_io((void __iomem *)vaddr, 0, size);
114
115 return fman_muram_vbase_to_offset(muram, vaddr);
116 }
117
118 /**
119 * fman_muram_free_mem
120 * @muram: FM-MURAM module pointer.
121 * @offset: offset of the memory region to be freed.
122 * @size: size of the memory to be freed.
123 *
124 * Free an allocated memory from FM-MURAM partition.
125 */
fman_muram_free_mem(struct muram_info * muram,unsigned long offset,size_t size)126 void fman_muram_free_mem(struct muram_info *muram, unsigned long offset,
127 size_t size)
128 {
129 unsigned long addr = fman_muram_offset_to_vbase(muram, offset);
130
131 gen_pool_free(muram->pool, addr, size);
132 }
133