2 * linux/arch/arm/mach-mmp/sram.c
4 * based on mach-davinci/sram.c - DaVinci simple SRAM allocator
6 * Copyright (c) 2011 Marvell Semiconductors Inc.
9 * Add for mmp sram support - Leo Yan <leoy@marvell.com>
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/platform_device.h>
21 #include <linux/err.h>
22 #include <linux/slab.h>
23 #include <linux/genalloc.h>
25 #include <linux/platform_data/dma-mmp_tdma.h>
27 struct sram_bank_info {
29 struct gen_pool *gpool;
32 phys_addr_t sram_phys;
33 void __iomem *sram_virt;
36 struct list_head node;
39 static DEFINE_MUTEX(sram_lock);
40 static LIST_HEAD(sram_bank_list);
42 struct gen_pool *sram_get_gpool(char *pool_name)
44 struct sram_bank_info *info = NULL;
49 mutex_lock(&sram_lock);
51 list_for_each_entry(info, &sram_bank_list, node)
52 if (!strcmp(pool_name, info->pool_name))
55 mutex_unlock(&sram_lock);
57 if (&info->node == &sram_bank_list)
62 EXPORT_SYMBOL(sram_get_gpool);
64 static int sram_probe(struct platform_device *pdev)
66 struct sram_platdata *pdata = pdev->dev.platform_data;
67 struct sram_bank_info *info;
71 if (!pdata || !pdata->pool_name)
74 info = kzalloc(sizeof(*info), GFP_KERNEL);
78 platform_set_drvdata(pdev, info);
80 res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
82 dev_err(&pdev->dev, "no memory resource defined\n");
87 if (!resource_size(res))
90 info->sram_phys = (phys_addr_t)res->start;
91 info->sram_size = resource_size(res);
92 info->sram_virt = ioremap(info->sram_phys, info->sram_size);
93 info->pool_name = kstrdup(pdata->pool_name, GFP_KERNEL);
94 info->granularity = pdata->granularity;
96 info->gpool = gen_pool_create(ilog2(info->granularity), -1);
98 dev_err(&pdev->dev, "create pool failed\n");
100 goto create_pool_err;
103 ret = gen_pool_add_virt(info->gpool, (unsigned long)info->sram_virt,
104 info->sram_phys, info->sram_size, -1);
106 dev_err(&pdev->dev, "add new chunk failed\n");
111 mutex_lock(&sram_lock);
112 list_add(&info->node, &sram_bank_list);
113 mutex_unlock(&sram_lock);
115 dev_info(&pdev->dev, "initialized\n");
119 gen_pool_destroy(info->gpool);
121 iounmap(info->sram_virt);
122 kfree(info->pool_name);
128 static int sram_remove(struct platform_device *pdev)
130 struct sram_bank_info *info;
132 info = platform_get_drvdata(pdev);
134 if (info->sram_size) {
135 mutex_lock(&sram_lock);
136 list_del(&info->node);
137 mutex_unlock(&sram_lock);
139 gen_pool_destroy(info->gpool);
140 iounmap(info->sram_virt);
141 kfree(info->pool_name);
149 static const struct platform_device_id sram_id_table[] = {
150 { "asram", MMP_ASRAM },
151 { "isram", MMP_ISRAM },
155 static struct platform_driver sram_driver = {
157 .remove = sram_remove,
161 .id_table = sram_id_table,
164 static int __init sram_init(void)
166 return platform_driver_register(&sram_driver);
168 core_initcall(sram_init);
170 MODULE_LICENSE("GPL");