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Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license as published by the free software foundation either version 2 of the license or at your option any later version extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
78 lines
1.6 KiB
C
78 lines
1.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* mach-davinci/sram.c - DaVinci simple SRAM allocator
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*
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* Copyright (C) 2009 David Brownell
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/genalloc.h>
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#include <mach/common.h>
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#include "sram.h"
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static struct gen_pool *sram_pool;
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struct gen_pool *sram_get_gen_pool(void)
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{
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return sram_pool;
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}
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void *sram_alloc(size_t len, dma_addr_t *dma)
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{
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dma_addr_t dma_base = davinci_soc_info.sram_dma;
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if (dma)
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*dma = 0;
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if (!sram_pool || (dma && !dma_base))
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return NULL;
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return gen_pool_dma_alloc(sram_pool, len, dma);
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}
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EXPORT_SYMBOL(sram_alloc);
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void sram_free(void *addr, size_t len)
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{
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gen_pool_free(sram_pool, (unsigned long) addr, len);
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}
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EXPORT_SYMBOL(sram_free);
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/*
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* REVISIT This supports CPU and DMA access to/from SRAM, but it
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* doesn't (yet?) support some other notable uses of SRAM: as TCM
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* for data and/or instructions; and holding code needed to enter
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* and exit suspend states (while DRAM can't be used).
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*/
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static int __init sram_init(void)
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{
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phys_addr_t phys = davinci_soc_info.sram_dma;
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unsigned len = davinci_soc_info.sram_len;
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int status = 0;
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void __iomem *addr;
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if (len) {
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len = min_t(unsigned, len, SRAM_SIZE);
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sram_pool = gen_pool_create(ilog2(SRAM_GRANULARITY), -1);
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if (!sram_pool)
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status = -ENOMEM;
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}
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if (sram_pool) {
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addr = ioremap(phys, len);
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if (!addr)
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return -ENOMEM;
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status = gen_pool_add_virt(sram_pool, (unsigned long) addr,
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phys, len, -1);
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if (status < 0)
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iounmap(addr);
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}
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WARN_ON(status < 0);
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return status;
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}
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core_initcall(sram_init);
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