170 lines
3.5 KiB
C
170 lines
3.5 KiB
C
/*
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* linux/arch/arm/mach-mmp/sram.c
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*
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* based on mach-davinci/sram.c - DaVinci simple SRAM allocator
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*
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* Copyright (c) 2011 Marvell Semiconductors Inc.
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* All Rights Reserved
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*
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* Add for mmp sram support - Leo Yan <leoy@marvell.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/module.h>
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#include <linux/mod_devicetable.h>
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#include <linux/init.h>
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#include <linux/platform_device.h>
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#include <linux/io.h>
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#include <linux/err.h>
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#include <linux/slab.h>
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#include <linux/genalloc.h>
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#include <linux/platform_data/dma-mmp_tdma.h>
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struct sram_bank_info {
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char *pool_name;
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struct gen_pool *gpool;
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int granularity;
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phys_addr_t sram_phys;
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void __iomem *sram_virt;
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u32 sram_size;
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struct list_head node;
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};
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static DEFINE_MUTEX(sram_lock);
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static LIST_HEAD(sram_bank_list);
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struct gen_pool *sram_get_gpool(char *pool_name)
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{
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struct sram_bank_info *info = NULL;
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if (!pool_name)
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return NULL;
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mutex_lock(&sram_lock);
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list_for_each_entry(info, &sram_bank_list, node)
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if (!strcmp(pool_name, info->pool_name))
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break;
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mutex_unlock(&sram_lock);
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if (&info->node == &sram_bank_list)
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return NULL;
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return info->gpool;
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}
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EXPORT_SYMBOL(sram_get_gpool);
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static int sram_probe(struct platform_device *pdev)
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{
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struct sram_platdata *pdata = pdev->dev.platform_data;
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struct sram_bank_info *info;
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struct resource *res;
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int ret = 0;
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if (!pdata || !pdata->pool_name)
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return -ENODEV;
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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if (!info)
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return -ENOMEM;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (res == NULL) {
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dev_err(&pdev->dev, "no memory resource defined\n");
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ret = -ENODEV;
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goto out;
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}
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if (!resource_size(res))
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return 0;
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info->sram_phys = (phys_addr_t)res->start;
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info->sram_size = resource_size(res);
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info->sram_virt = ioremap(info->sram_phys, info->sram_size);
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info->pool_name = kstrdup(pdata->pool_name, GFP_KERNEL);
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info->granularity = pdata->granularity;
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info->gpool = gen_pool_create(ilog2(info->granularity), -1);
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if (!info->gpool) {
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dev_err(&pdev->dev, "create pool failed\n");
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ret = -ENOMEM;
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goto create_pool_err;
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}
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ret = gen_pool_add_virt(info->gpool, (unsigned long)info->sram_virt,
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info->sram_phys, info->sram_size, -1);
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if (ret < 0) {
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dev_err(&pdev->dev, "add new chunk failed\n");
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ret = -ENOMEM;
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goto add_chunk_err;
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}
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mutex_lock(&sram_lock);
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list_add(&info->node, &sram_bank_list);
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mutex_unlock(&sram_lock);
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platform_set_drvdata(pdev, info);
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dev_info(&pdev->dev, "initialized\n");
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return 0;
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add_chunk_err:
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gen_pool_destroy(info->gpool);
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create_pool_err:
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iounmap(info->sram_virt);
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kfree(info->pool_name);
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out:
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kfree(info);
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return ret;
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}
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static int sram_remove(struct platform_device *pdev)
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{
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struct sram_bank_info *info;
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info = platform_get_drvdata(pdev);
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if (info == NULL)
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return -ENODEV;
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mutex_lock(&sram_lock);
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list_del(&info->node);
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mutex_unlock(&sram_lock);
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gen_pool_destroy(info->gpool);
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iounmap(info->sram_virt);
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kfree(info->pool_name);
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kfree(info);
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return 0;
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}
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static const struct platform_device_id sram_id_table[] = {
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{ "asram", MMP_ASRAM },
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{ "isram", MMP_ISRAM },
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{ }
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};
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static struct platform_driver sram_driver = {
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.probe = sram_probe,
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.remove = sram_remove,
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.driver = {
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.name = "mmp-sram",
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},
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.id_table = sram_id_table,
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};
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static int __init sram_init(void)
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{
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return platform_driver_register(&sram_driver);
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}
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core_initcall(sram_init);
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MODULE_LICENSE("GPL");
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