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3bb16560 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
2f9ea1bd SM |
2 | /* |
3 | * Simple memory allocator for on-board SRAM | |
4 | * | |
2f9ea1bd SM |
5 | * Maintainer : Sylvain Munaut <tnt@246tNt.com> |
6 | * | |
7 | * Copyright (C) 2005 Sylvain Munaut <tnt@246tNt.com> | |
2f9ea1bd SM |
8 | */ |
9 | ||
22ae782f | 10 | #include <linux/err.h> |
2f9ea1bd | 11 | #include <linux/kernel.h> |
4b16f8e2 | 12 | #include <linux/export.h> |
2f9ea1bd SM |
13 | #include <linux/slab.h> |
14 | #include <linux/spinlock.h> | |
15 | #include <linux/string.h> | |
16 | #include <linux/ioport.h> | |
17 | #include <linux/of.h> | |
5af50730 | 18 | #include <linux/of_address.h> |
2f9ea1bd SM |
19 | |
20 | #include <asm/io.h> | |
21 | #include <asm/mmu.h> | |
22 | ||
9a322993 | 23 | #include <linux/fsl/bestcomm/sram.h> |
2f9ea1bd SM |
24 | |
25 | ||
26 | /* Struct keeping our 'state' */ | |
27 | struct bcom_sram *bcom_sram = NULL; | |
28 | EXPORT_SYMBOL_GPL(bcom_sram); /* needed for inline functions */ | |
29 | ||
30 | ||
31 | /* ======================================================================== */ | |
32 | /* Public API */ | |
33 | /* ======================================================================== */ | |
34 | /* DO NOT USE in interrupts, if needed in irq handler, we should use the | |
35 | _irqsave version of the spin_locks */ | |
36 | ||
37 | int bcom_sram_init(struct device_node *sram_node, char *owner) | |
38 | { | |
39 | int rv; | |
40 | const u32 *regaddr_p; | |
f60a1508 | 41 | struct resource res; |
2f9ea1bd SM |
42 | unsigned int psize; |
43 | ||
44 | /* Create our state struct */ | |
45 | if (bcom_sram) { | |
46 | printk(KERN_ERR "%s: bcom_sram_init: " | |
47 | "Already initialized !\n", owner); | |
48 | return -EBUSY; | |
49 | } | |
50 | ||
51 | bcom_sram = kmalloc(sizeof(struct bcom_sram), GFP_KERNEL); | |
52 | if (!bcom_sram) { | |
53 | printk(KERN_ERR "%s: bcom_sram_init: " | |
54 | "Couldn't allocate internal state !\n", owner); | |
55 | return -ENOMEM; | |
56 | } | |
57 | ||
58 | /* Get address and size of the sram */ | |
f60a1508 RH |
59 | rv = of_address_to_resource(sram_node, 0, &res); |
60 | if (rv) { | |
2f9ea1bd SM |
61 | printk(KERN_ERR "%s: bcom_sram_init: " |
62 | "Invalid device node !\n", owner); | |
2f9ea1bd SM |
63 | goto error_free; |
64 | } | |
65 | ||
f60a1508 RH |
66 | bcom_sram->base_phys = res.start; |
67 | bcom_sram->size = resource_size(&res); | |
2f9ea1bd SM |
68 | |
69 | /* Request region */ | |
f60a1508 | 70 | if (!request_mem_region(res.start, resource_size(&res), owner)) { |
2f9ea1bd SM |
71 | printk(KERN_ERR "%s: bcom_sram_init: " |
72 | "Couldn't request region !\n", owner); | |
73 | rv = -EBUSY; | |
74 | goto error_free; | |
75 | } | |
76 | ||
77 | /* Map SRAM */ | |
78 | /* sram is not really __iomem */ | |
f60a1508 | 79 | bcom_sram->base_virt = (void *)ioremap(res.start, resource_size(&res)); |
2f9ea1bd SM |
80 | |
81 | if (!bcom_sram->base_virt) { | |
82 | printk(KERN_ERR "%s: bcom_sram_init: " | |
83 | "Map error SRAM zone 0x%08lx (0x%0x)!\n", | |
08b6c06d | 84 | owner, (long)bcom_sram->base_phys, bcom_sram->size ); |
2f9ea1bd SM |
85 | rv = -ENOMEM; |
86 | goto error_release; | |
87 | } | |
88 | ||
89 | /* Create an rheap (defaults to 32 bits word alignment) */ | |
90 | bcom_sram->rh = rh_create(4); | |
91 | ||
92 | /* Attach the free zones */ | |
2f9ea1bd SM |
93 | regaddr_p = NULL; |
94 | psize = 0; | |
2f9ea1bd SM |
95 | |
96 | if (!regaddr_p || !psize) { | |
97 | /* Attach the whole zone */ | |
98 | rh_attach_region(bcom_sram->rh, 0, bcom_sram->size); | |
99 | } else { | |
100 | /* Attach each zone independently */ | |
101 | while (psize >= 2 * sizeof(u32)) { | |
102 | phys_addr_t zbase = of_translate_address(sram_node, regaddr_p); | |
103 | rh_attach_region(bcom_sram->rh, zbase - bcom_sram->base_phys, regaddr_p[1]); | |
104 | regaddr_p += 2; | |
105 | psize -= 2 * sizeof(u32); | |
106 | } | |
107 | } | |
108 | ||
109 | /* Init our spinlock */ | |
110 | spin_lock_init(&bcom_sram->lock); | |
111 | ||
112 | return 0; | |
113 | ||
114 | error_release: | |
f60a1508 | 115 | release_mem_region(res.start, resource_size(&res)); |
2f9ea1bd SM |
116 | error_free: |
117 | kfree(bcom_sram); | |
118 | bcom_sram = NULL; | |
119 | ||
120 | return rv; | |
121 | } | |
122 | EXPORT_SYMBOL_GPL(bcom_sram_init); | |
123 | ||
124 | void bcom_sram_cleanup(void) | |
125 | { | |
126 | /* Free resources */ | |
127 | if (bcom_sram) { | |
128 | rh_destroy(bcom_sram->rh); | |
129 | iounmap((void __iomem *)bcom_sram->base_virt); | |
130 | release_mem_region(bcom_sram->base_phys, bcom_sram->size); | |
131 | kfree(bcom_sram); | |
132 | bcom_sram = NULL; | |
133 | } | |
134 | } | |
135 | EXPORT_SYMBOL_GPL(bcom_sram_cleanup); | |
136 | ||
137 | void* bcom_sram_alloc(int size, int align, phys_addr_t *phys) | |
138 | { | |
139 | unsigned long offset; | |
140 | ||
141 | spin_lock(&bcom_sram->lock); | |
142 | offset = rh_alloc_align(bcom_sram->rh, size, align, NULL); | |
143 | spin_unlock(&bcom_sram->lock); | |
144 | ||
145 | if (IS_ERR_VALUE(offset)) | |
146 | return NULL; | |
147 | ||
148 | *phys = bcom_sram->base_phys + offset; | |
149 | return bcom_sram->base_virt + offset; | |
150 | } | |
151 | EXPORT_SYMBOL_GPL(bcom_sram_alloc); | |
152 | ||
153 | void bcom_sram_free(void *ptr) | |
154 | { | |
155 | unsigned long offset; | |
156 | ||
157 | if (!ptr) | |
158 | return; | |
159 | ||
160 | offset = ptr - bcom_sram->base_virt; | |
161 | ||
162 | spin_lock(&bcom_sram->lock); | |
163 | rh_free(bcom_sram->rh, offset); | |
164 | spin_unlock(&bcom_sram->lock); | |
165 | } | |
166 | EXPORT_SYMBOL_GPL(bcom_sram_free); |