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165 lines
3.4 KiB
165 lines
3.4 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]> |
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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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