Commit | Line | Data |
---|---|---|
2f9ea1bd SM |
1 | /* |
2 | * Simple memory allocator for on-board SRAM | |
3 | * | |
4 | * | |
5 | * Maintainer : Sylvain Munaut <tnt@246tNt.com> | |
6 | * | |
7 | * Copyright (C) 2005 Sylvain Munaut <tnt@246tNt.com> | |
8 | * | |
9 | * This file is licensed under the terms of the GNU General Public License | |
10 | * version 2. This program is licensed "as is" without any warranty of any | |
11 | * kind, whether express or implied. | |
12 | */ | |
13 | ||
22ae782f | 14 | #include <linux/err.h> |
2f9ea1bd | 15 | #include <linux/kernel.h> |
4b16f8e2 | 16 | #include <linux/export.h> |
2f9ea1bd SM |
17 | #include <linux/slab.h> |
18 | #include <linux/spinlock.h> | |
19 | #include <linux/string.h> | |
20 | #include <linux/ioport.h> | |
21 | #include <linux/of.h> | |
5af50730 | 22 | #include <linux/of_address.h> |
2f9ea1bd SM |
23 | |
24 | #include <asm/io.h> | |
25 | #include <asm/mmu.h> | |
26 | ||
9a322993 | 27 | #include <linux/fsl/bestcomm/sram.h> |
2f9ea1bd SM |
28 | |
29 | ||
30 | /* Struct keeping our 'state' */ | |
31 | struct bcom_sram *bcom_sram = NULL; | |
32 | EXPORT_SYMBOL_GPL(bcom_sram); /* needed for inline functions */ | |
33 | ||
34 | ||
35 | /* ======================================================================== */ | |
36 | /* Public API */ | |
37 | /* ======================================================================== */ | |
38 | /* DO NOT USE in interrupts, if needed in irq handler, we should use the | |
39 | _irqsave version of the spin_locks */ | |
40 | ||
41 | int bcom_sram_init(struct device_node *sram_node, char *owner) | |
42 | { | |
43 | int rv; | |
44 | const u32 *regaddr_p; | |
45 | u64 regaddr64, size64; | |
46 | unsigned int psize; | |
47 | ||
48 | /* Create our state struct */ | |
49 | if (bcom_sram) { | |
50 | printk(KERN_ERR "%s: bcom_sram_init: " | |
51 | "Already initialized !\n", owner); | |
52 | return -EBUSY; | |
53 | } | |
54 | ||
55 | bcom_sram = kmalloc(sizeof(struct bcom_sram), GFP_KERNEL); | |
56 | if (!bcom_sram) { | |
57 | printk(KERN_ERR "%s: bcom_sram_init: " | |
58 | "Couldn't allocate internal state !\n", owner); | |
59 | return -ENOMEM; | |
60 | } | |
61 | ||
62 | /* Get address and size of the sram */ | |
63 | regaddr_p = of_get_address(sram_node, 0, &size64, NULL); | |
64 | if (!regaddr_p) { | |
65 | printk(KERN_ERR "%s: bcom_sram_init: " | |
66 | "Invalid device node !\n", owner); | |
67 | rv = -EINVAL; | |
68 | goto error_free; | |
69 | } | |
70 | ||
71 | regaddr64 = of_translate_address(sram_node, regaddr_p); | |
72 | ||
73 | bcom_sram->base_phys = (phys_addr_t) regaddr64; | |
74 | bcom_sram->size = (unsigned int) size64; | |
75 | ||
76 | /* Request region */ | |
77 | if (!request_mem_region(bcom_sram->base_phys, bcom_sram->size, owner)) { | |
78 | printk(KERN_ERR "%s: bcom_sram_init: " | |
79 | "Couldn't request region !\n", owner); | |
80 | rv = -EBUSY; | |
81 | goto error_free; | |
82 | } | |
83 | ||
84 | /* Map SRAM */ | |
85 | /* sram is not really __iomem */ | |
86 | bcom_sram->base_virt = (void*) ioremap(bcom_sram->base_phys, bcom_sram->size); | |
87 | ||
88 | if (!bcom_sram->base_virt) { | |
89 | printk(KERN_ERR "%s: bcom_sram_init: " | |
90 | "Map error SRAM zone 0x%08lx (0x%0x)!\n", | |
08b6c06d | 91 | owner, (long)bcom_sram->base_phys, bcom_sram->size ); |
2f9ea1bd SM |
92 | rv = -ENOMEM; |
93 | goto error_release; | |
94 | } | |
95 | ||
96 | /* Create an rheap (defaults to 32 bits word alignment) */ | |
97 | bcom_sram->rh = rh_create(4); | |
98 | ||
99 | /* Attach the free zones */ | |
100 | #if 0 | |
101 | /* Currently disabled ... for future use only */ | |
102 | reg_addr_p = of_get_property(sram_node, "available", &psize); | |
103 | #else | |
104 | regaddr_p = NULL; | |
105 | psize = 0; | |
106 | #endif | |
107 | ||
108 | if (!regaddr_p || !psize) { | |
109 | /* Attach the whole zone */ | |
110 | rh_attach_region(bcom_sram->rh, 0, bcom_sram->size); | |
111 | } else { | |
112 | /* Attach each zone independently */ | |
113 | while (psize >= 2 * sizeof(u32)) { | |
114 | phys_addr_t zbase = of_translate_address(sram_node, regaddr_p); | |
115 | rh_attach_region(bcom_sram->rh, zbase - bcom_sram->base_phys, regaddr_p[1]); | |
116 | regaddr_p += 2; | |
117 | psize -= 2 * sizeof(u32); | |
118 | } | |
119 | } | |
120 | ||
121 | /* Init our spinlock */ | |
122 | spin_lock_init(&bcom_sram->lock); | |
123 | ||
124 | return 0; | |
125 | ||
126 | error_release: | |
127 | release_mem_region(bcom_sram->base_phys, bcom_sram->size); | |
128 | error_free: | |
129 | kfree(bcom_sram); | |
130 | bcom_sram = NULL; | |
131 | ||
132 | return rv; | |
133 | } | |
134 | EXPORT_SYMBOL_GPL(bcom_sram_init); | |
135 | ||
136 | void bcom_sram_cleanup(void) | |
137 | { | |
138 | /* Free resources */ | |
139 | if (bcom_sram) { | |
140 | rh_destroy(bcom_sram->rh); | |
141 | iounmap((void __iomem *)bcom_sram->base_virt); | |
142 | release_mem_region(bcom_sram->base_phys, bcom_sram->size); | |
143 | kfree(bcom_sram); | |
144 | bcom_sram = NULL; | |
145 | } | |
146 | } | |
147 | EXPORT_SYMBOL_GPL(bcom_sram_cleanup); | |
148 | ||
149 | void* bcom_sram_alloc(int size, int align, phys_addr_t *phys) | |
150 | { | |
151 | unsigned long offset; | |
152 | ||
153 | spin_lock(&bcom_sram->lock); | |
154 | offset = rh_alloc_align(bcom_sram->rh, size, align, NULL); | |
155 | spin_unlock(&bcom_sram->lock); | |
156 | ||
157 | if (IS_ERR_VALUE(offset)) | |
158 | return NULL; | |
159 | ||
160 | *phys = bcom_sram->base_phys + offset; | |
161 | return bcom_sram->base_virt + offset; | |
162 | } | |
163 | EXPORT_SYMBOL_GPL(bcom_sram_alloc); | |
164 | ||
165 | void bcom_sram_free(void *ptr) | |
166 | { | |
167 | unsigned long offset; | |
168 | ||
169 | if (!ptr) | |
170 | return; | |
171 | ||
172 | offset = ptr - bcom_sram->base_virt; | |
173 | ||
174 | spin_lock(&bcom_sram->lock); | |
175 | rh_free(bcom_sram->rh, offset); | |
176 | spin_unlock(&bcom_sram->lock); | |
177 | } | |
178 | EXPORT_SYMBOL_GPL(bcom_sram_free); | |
179 |