tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/slab.h>
28#include <linux/err.h>
29#include <linux/of_platform.h>
30#include <asm/pgtable.h>
31#include <asm/fsl_85xx_cache_sram.h>
32
33#include "fsl_85xx_cache_ctlr.h"
34
35struct mpc85xx_cache_sram *cache_sram;
36
37void *mpc85xx_cache_sram_alloc(unsigned int size,
38 phys_addr_t *phys, unsigned int align)
39{
40 unsigned long offset;
41 unsigned long flags;
42
43 if (unlikely(cache_sram == NULL))
44 return NULL;
45
46 if (!size || (size > cache_sram->size) || (align > cache_sram->size)) {
47 pr_err("%s(): size(=%x) or align(=%x) zero or too big\n",
48 __func__, size, align);
49 return NULL;
50 }
51
52 if ((align & (align - 1)) || align <= 1) {
53 pr_err("%s(): align(=%x) must be power of two and >1\n",
54 __func__, align);
55 return NULL;
56 }
57
58 spin_lock_irqsave(&cache_sram->lock, flags);
59 offset = rh_alloc_align(cache_sram->rh, size, align, NULL);
60 spin_unlock_irqrestore(&cache_sram->lock, flags);
61
62 if (IS_ERR_VALUE(offset))
63 return NULL;
64
65 *phys = cache_sram->base_phys + offset;
66
67 return (unsigned char *)cache_sram->base_virt + offset;
68}
69EXPORT_SYMBOL(mpc85xx_cache_sram_alloc);
70
71void mpc85xx_cache_sram_free(void *ptr)
72{
73 unsigned long flags;
74 BUG_ON(!ptr);
75
76 spin_lock_irqsave(&cache_sram->lock, flags);
77 rh_free(cache_sram->rh, ptr - cache_sram->base_virt);
78 spin_unlock_irqrestore(&cache_sram->lock, flags);
79}
80EXPORT_SYMBOL(mpc85xx_cache_sram_free);
81
82int __init instantiate_cache_sram(struct platform_device *dev,
83 struct sram_parameters sram_params)
84{
85 int ret = 0;
86
87 if (cache_sram) {
88 dev_err(&dev->dev, "Already initialized cache-sram\n");
89 return -EBUSY;
90 }
91
92 cache_sram = kzalloc(sizeof(struct mpc85xx_cache_sram), GFP_KERNEL);
93 if (!cache_sram) {
94 dev_err(&dev->dev, "Out of memory for cache_sram structure\n");
95 return -ENOMEM;
96 }
97
98 cache_sram->base_phys = sram_params.sram_offset;
99 cache_sram->size = sram_params.sram_size;
100
101 if (!request_mem_region(cache_sram->base_phys, cache_sram->size,
102 "fsl_85xx_cache_sram")) {
103 dev_err(&dev->dev, "%s: request memory failed\n",
104 dev->dev.of_node->full_name);
105 ret = -ENXIO;
106 goto out_free;
107 }
108
109 cache_sram->base_virt = ioremap_flags(cache_sram->base_phys,
110 cache_sram->size, _PAGE_COHERENT | PAGE_KERNEL);
111 if (!cache_sram->base_virt) {
112 dev_err(&dev->dev, "%s: ioremap_flags failed\n",
113 dev->dev.of_node->full_name);
114 ret = -ENOMEM;
115 goto out_release;
116 }
117
118 cache_sram->rh = rh_create(sizeof(unsigned int));
119 if (IS_ERR(cache_sram->rh)) {
120 dev_err(&dev->dev, "%s: Unable to create remote heap\n",
121 dev->dev.of_node->full_name);
122 ret = PTR_ERR(cache_sram->rh);
123 goto out_unmap;
124 }
125
126 rh_attach_region(cache_sram->rh, 0, cache_sram->size);
127 spin_lock_init(&cache_sram->lock);
128
129 dev_info(&dev->dev, "[base:0x%llx, size:0x%x] configured and loaded\n",
130 (unsigned long long)cache_sram->base_phys, cache_sram->size);
131
132 return 0;
133
134out_unmap:
135 iounmap(cache_sram->base_virt);
136
137out_release:
138 release_mem_region(cache_sram->base_phys, cache_sram->size);
139
140out_free:
141 kfree(cache_sram);
142 return ret;
143}
144
145void remove_cache_sram(struct platform_device *dev)
146{
147 BUG_ON(!cache_sram);
148
149 rh_detach_region(cache_sram->rh, 0, cache_sram->size);
150 rh_destroy(cache_sram->rh);
151
152 iounmap(cache_sram->base_virt);
153 release_mem_region(cache_sram->base_phys, cache_sram->size);
154
155 kfree(cache_sram);
156 cache_sram = NULL;
157
158 dev_info(&dev->dev, "MPC85xx Cache-SRAM driver unloaded\n");
159}