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77 lines
1.6 KiB
77 lines
1.6 KiB
// 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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