1 /*
2 * Copyright 2009-2010 Freescale Semiconductor, Inc.
3 *
4 * Simple memory allocator abstraction for QorIQ (P1/P2) based Cache-SRAM
5 *
6 * Author: Vivek Mahajan <vivek.mahajan@freescale.com>
7 *
8 * This file is derived from the original work done
9 * by Sylvain Munaut for the Bestcomm SRAM allocator.
10 *
11 * This program is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by the
13 * Free Software Foundation; either version 2 of the License, or (at your
14 * option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25
26 #include <linux/kernel.h>
27 #include <linux/export.h>
28 #include <linux/slab.h>
29 #include <linux/err.h>
30 #include <linux/of_platform.h>
31 #include <asm/pgtable.h>
32 #include <asm/fsl_85xx_cache_sram.h>
33
34 #include "fsl_85xx_cache_ctlr.h"
35
36 struct mpc85xx_cache_sram *cache_sram;
37
mpc85xx_cache_sram_alloc(unsigned int size,phys_addr_t * phys,unsigned int align)38 void *mpc85xx_cache_sram_alloc(unsigned int size,
39 phys_addr_t *phys, unsigned int align)
40 {
41 unsigned long offset;
42 unsigned long flags;
43
44 if (unlikely(cache_sram == NULL))
45 return NULL;
46
47 if (!size || (size > cache_sram->size) || (align > cache_sram->size)) {
48 pr_err("%s(): size(=%x) or align(=%x) zero or too big\n",
49 __func__, size, align);
50 return NULL;
51 }
52
53 if ((align & (align - 1)) || align <= 1) {
54 pr_err("%s(): align(=%x) must be power of two and >1\n",
55 __func__, align);
56 return NULL;
57 }
58
59 spin_lock_irqsave(&cache_sram->lock, flags);
60 offset = rh_alloc_align(cache_sram->rh, size, align, NULL);
61 spin_unlock_irqrestore(&cache_sram->lock, flags);
62
63 if (IS_ERR_VALUE(offset))
64 return NULL;
65
66 *phys = cache_sram->base_phys + offset;
67
68 return (unsigned char *)cache_sram->base_virt + offset;
69 }
70 EXPORT_SYMBOL(mpc85xx_cache_sram_alloc);
71
mpc85xx_cache_sram_free(void * ptr)72 void mpc85xx_cache_sram_free(void *ptr)
73 {
74 unsigned long flags;
75 BUG_ON(!ptr);
76
77 spin_lock_irqsave(&cache_sram->lock, flags);
78 rh_free(cache_sram->rh, ptr - cache_sram->base_virt);
79 spin_unlock_irqrestore(&cache_sram->lock, flags);
80 }
81 EXPORT_SYMBOL(mpc85xx_cache_sram_free);
82
instantiate_cache_sram(struct platform_device * dev,struct sram_parameters sram_params)83 int __init instantiate_cache_sram(struct platform_device *dev,
84 struct sram_parameters sram_params)
85 {
86 int ret = 0;
87
88 if (cache_sram) {
89 dev_err(&dev->dev, "Already initialized cache-sram\n");
90 return -EBUSY;
91 }
92
93 cache_sram = kzalloc(sizeof(struct mpc85xx_cache_sram), GFP_KERNEL);
94 if (!cache_sram) {
95 dev_err(&dev->dev, "Out of memory for cache_sram structure\n");
96 return -ENOMEM;
97 }
98
99 cache_sram->base_phys = sram_params.sram_offset;
100 cache_sram->size = sram_params.sram_size;
101
102 if (!request_mem_region(cache_sram->base_phys, cache_sram->size,
103 "fsl_85xx_cache_sram")) {
104 dev_err(&dev->dev, "%s: request memory failed\n",
105 dev->dev.of_node->full_name);
106 ret = -ENXIO;
107 goto out_free;
108 }
109
110 cache_sram->base_virt = ioremap_prot(cache_sram->base_phys,
111 cache_sram->size, _PAGE_COHERENT | PAGE_KERNEL);
112 if (!cache_sram->base_virt) {
113 dev_err(&dev->dev, "%s: ioremap_prot failed\n",
114 dev->dev.of_node->full_name);
115 ret = -ENOMEM;
116 goto out_release;
117 }
118
119 cache_sram->rh = rh_create(sizeof(unsigned int));
120 if (IS_ERR(cache_sram->rh)) {
121 dev_err(&dev->dev, "%s: Unable to create remote heap\n",
122 dev->dev.of_node->full_name);
123 ret = PTR_ERR(cache_sram->rh);
124 goto out_unmap;
125 }
126
127 rh_attach_region(cache_sram->rh, 0, cache_sram->size);
128 spin_lock_init(&cache_sram->lock);
129
130 dev_info(&dev->dev, "[base:0x%llx, size:0x%x] configured and loaded\n",
131 (unsigned long long)cache_sram->base_phys, cache_sram->size);
132
133 return 0;
134
135 out_unmap:
136 iounmap(cache_sram->base_virt);
137
138 out_release:
139 release_mem_region(cache_sram->base_phys, cache_sram->size);
140
141 out_free:
142 kfree(cache_sram);
143 return ret;
144 }
145
remove_cache_sram(struct platform_device * dev)146 void remove_cache_sram(struct platform_device *dev)
147 {
148 BUG_ON(!cache_sram);
149
150 rh_detach_region(cache_sram->rh, 0, cache_sram->size);
151 rh_destroy(cache_sram->rh);
152
153 iounmap(cache_sram->base_virt);
154 release_mem_region(cache_sram->base_phys, cache_sram->size);
155
156 kfree(cache_sram);
157 cache_sram = NULL;
158
159 dev_info(&dev->dev, "MPC85xx Cache-SRAM driver unloaded\n");
160 }
161