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Linux/arch/arm/mach-mmp/sram.c

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  1 /*
  2  *  linux/arch/arm/mach-mmp/sram.c
  3  *
  4  *  based on mach-davinci/sram.c - DaVinci simple SRAM allocator
  5  *
  6  *  Copyright (c) 2011 Marvell Semiconductors Inc.
  7  *  All Rights Reserved
  8  *
  9  *  Add for mmp sram support - Leo Yan <leoy@marvell.com>
 10  *
 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.
 14  *
 15  */
 16 
 17 #include <linux/module.h>
 18 #include <linux/init.h>
 19 #include <linux/platform_device.h>
 20 #include <linux/io.h>
 21 #include <linux/err.h>
 22 #include <linux/slab.h>
 23 #include <linux/genalloc.h>
 24 
 25 #include <linux/platform_data/dma-mmp_tdma.h>
 26 
 27 struct sram_bank_info {
 28         char *pool_name;
 29         struct gen_pool *gpool;
 30         int granularity;
 31 
 32         phys_addr_t sram_phys;
 33         void __iomem *sram_virt;
 34         u32 sram_size;
 35 
 36         struct list_head node;
 37 };
 38 
 39 static DEFINE_MUTEX(sram_lock);
 40 static LIST_HEAD(sram_bank_list);
 41 
 42 struct gen_pool *sram_get_gpool(char *pool_name)
 43 {
 44         struct sram_bank_info *info = NULL;
 45 
 46         if (!pool_name)
 47                 return NULL;
 48 
 49         mutex_lock(&sram_lock);
 50 
 51         list_for_each_entry(info, &sram_bank_list, node)
 52                 if (!strcmp(pool_name, info->pool_name))
 53                         break;
 54 
 55         mutex_unlock(&sram_lock);
 56 
 57         if (&info->node == &sram_bank_list)
 58                 return NULL;
 59 
 60         return info->gpool;
 61 }
 62 EXPORT_SYMBOL(sram_get_gpool);
 63 
 64 static int sram_probe(struct platform_device *pdev)
 65 {
 66         struct sram_platdata *pdata = pdev->dev.platform_data;
 67         struct sram_bank_info *info;
 68         struct resource *res;
 69         int ret = 0;
 70 
 71         if (!pdata || !pdata->pool_name)
 72                 return -ENODEV;
 73 
 74         info = kzalloc(sizeof(*info), GFP_KERNEL);
 75         if (!info)
 76                 return -ENOMEM;
 77 
 78         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 79         if (res == NULL) {
 80                 dev_err(&pdev->dev, "no memory resource defined\n");
 81                 ret = -ENODEV;
 82                 goto out;
 83         }
 84 
 85         if (!resource_size(res))
 86                 return 0;
 87 
 88         info->sram_phys   = (phys_addr_t)res->start;
 89         info->sram_size   = resource_size(res);
 90         info->sram_virt   = ioremap(info->sram_phys, info->sram_size);
 91         info->pool_name   = kstrdup(pdata->pool_name, GFP_KERNEL);
 92         info->granularity = pdata->granularity;
 93 
 94         info->gpool = gen_pool_create(ilog2(info->granularity), -1);
 95         if (!info->gpool) {
 96                 dev_err(&pdev->dev, "create pool failed\n");
 97                 ret = -ENOMEM;
 98                 goto create_pool_err;
 99         }
100 
101         ret = gen_pool_add_virt(info->gpool, (unsigned long)info->sram_virt,
102                                 info->sram_phys, info->sram_size, -1);
103         if (ret < 0) {
104                 dev_err(&pdev->dev, "add new chunk failed\n");
105                 ret = -ENOMEM;
106                 goto add_chunk_err;
107         }
108 
109         mutex_lock(&sram_lock);
110         list_add(&info->node, &sram_bank_list);
111         mutex_unlock(&sram_lock);
112 
113         platform_set_drvdata(pdev, info);
114 
115         dev_info(&pdev->dev, "initialized\n");
116         return 0;
117 
118 add_chunk_err:
119         gen_pool_destroy(info->gpool);
120 create_pool_err:
121         iounmap(info->sram_virt);
122         kfree(info->pool_name);
123 out:
124         kfree(info);
125         return ret;
126 }
127 
128 static int sram_remove(struct platform_device *pdev)
129 {
130         struct sram_bank_info *info;
131 
132         info = platform_get_drvdata(pdev);
133         if (info == NULL)
134                 return -ENODEV;
135 
136         mutex_lock(&sram_lock);
137         list_del(&info->node);
138         mutex_unlock(&sram_lock);
139 
140         gen_pool_destroy(info->gpool);
141         iounmap(info->sram_virt);
142         kfree(info->pool_name);
143         kfree(info);
144         return 0;
145 }
146 
147 static const struct platform_device_id sram_id_table[] = {
148         { "asram", MMP_ASRAM },
149         { "isram", MMP_ISRAM },
150         { }
151 };
152 
153 static struct platform_driver sram_driver = {
154         .probe          = sram_probe,
155         .remove         = sram_remove,
156         .driver         = {
157                 .name   = "mmp-sram",
158         },
159         .id_table       = sram_id_table,
160 };
161 
162 static int __init sram_init(void)
163 {
164         return platform_driver_register(&sram_driver);
165 }
166 core_initcall(sram_init);
167 
168 MODULE_LICENSE("GPL");
169 

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