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179 lines
4.3 KiB
179 lines
4.3 KiB
/* |
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* Simple memory allocator for on-board SRAM |
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* |
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* |
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* Maintainer : Sylvain Munaut <[email protected]> |
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* |
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* Copyright (C) 2005 Sylvain Munaut <[email protected]> |
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* |
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* This file is licensed under the terms of the GNU General Public License |
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* version 2. This program is licensed "as is" without any warranty of any |
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* kind, whether express or implied. |
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*/ |
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#include <linux/err.h> |
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#include <linux/kernel.h> |
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#include <linux/export.h> |
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#include <linux/slab.h> |
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#include <linux/spinlock.h> |
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#include <linux/string.h> |
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#include <linux/ioport.h> |
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#include <linux/of.h> |
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#include <linux/of_address.h> |
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#include <asm/io.h> |
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#include <asm/mmu.h> |
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#include <linux/fsl/bestcomm/sram.h> |
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/* Struct keeping our 'state' */ |
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struct bcom_sram *bcom_sram = NULL; |
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EXPORT_SYMBOL_GPL(bcom_sram); /* needed for inline functions */ |
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/* ======================================================================== */ |
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/* Public API */ |
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/* ======================================================================== */ |
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/* DO NOT USE in interrupts, if needed in irq handler, we should use the |
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_irqsave version of the spin_locks */ |
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int bcom_sram_init(struct device_node *sram_node, char *owner) |
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{ |
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int rv; |
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const u32 *regaddr_p; |
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u64 regaddr64, size64; |
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unsigned int psize; |
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/* Create our state struct */ |
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if (bcom_sram) { |
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printk(KERN_ERR "%s: bcom_sram_init: " |
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"Already initialized !\n", owner); |
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return -EBUSY; |
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} |
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bcom_sram = kmalloc(sizeof(struct bcom_sram), GFP_KERNEL); |
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if (!bcom_sram) { |
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printk(KERN_ERR "%s: bcom_sram_init: " |
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"Couldn't allocate internal state !\n", owner); |
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return -ENOMEM; |
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} |
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/* Get address and size of the sram */ |
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regaddr_p = of_get_address(sram_node, 0, &size64, NULL); |
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if (!regaddr_p) { |
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printk(KERN_ERR "%s: bcom_sram_init: " |
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"Invalid device node !\n", owner); |
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rv = -EINVAL; |
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goto error_free; |
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} |
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regaddr64 = of_translate_address(sram_node, regaddr_p); |
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bcom_sram->base_phys = (phys_addr_t) regaddr64; |
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bcom_sram->size = (unsigned int) size64; |
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/* Request region */ |
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if (!request_mem_region(bcom_sram->base_phys, bcom_sram->size, owner)) { |
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printk(KERN_ERR "%s: bcom_sram_init: " |
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"Couldn't request region !\n", owner); |
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rv = -EBUSY; |
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goto error_free; |
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} |
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/* Map SRAM */ |
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/* sram is not really __iomem */ |
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bcom_sram->base_virt = (void*) ioremap(bcom_sram->base_phys, bcom_sram->size); |
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if (!bcom_sram->base_virt) { |
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printk(KERN_ERR "%s: bcom_sram_init: " |
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"Map error SRAM zone 0x%08lx (0x%0x)!\n", |
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owner, (long)bcom_sram->base_phys, bcom_sram->size ); |
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rv = -ENOMEM; |
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goto error_release; |
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} |
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/* Create an rheap (defaults to 32 bits word alignment) */ |
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bcom_sram->rh = rh_create(4); |
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/* Attach the free zones */ |
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#if 0 |
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/* Currently disabled ... for future use only */ |
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reg_addr_p = of_get_property(sram_node, "available", &psize); |
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#else |
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regaddr_p = NULL; |
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psize = 0; |
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#endif |
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if (!regaddr_p || !psize) { |
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/* Attach the whole zone */ |
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rh_attach_region(bcom_sram->rh, 0, bcom_sram->size); |
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} else { |
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/* Attach each zone independently */ |
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while (psize >= 2 * sizeof(u32)) { |
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phys_addr_t zbase = of_translate_address(sram_node, regaddr_p); |
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rh_attach_region(bcom_sram->rh, zbase - bcom_sram->base_phys, regaddr_p[1]); |
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regaddr_p += 2; |
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psize -= 2 * sizeof(u32); |
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} |
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} |
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/* Init our spinlock */ |
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spin_lock_init(&bcom_sram->lock); |
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return 0; |
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error_release: |
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release_mem_region(bcom_sram->base_phys, bcom_sram->size); |
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error_free: |
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kfree(bcom_sram); |
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bcom_sram = NULL; |
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return rv; |
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} |
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EXPORT_SYMBOL_GPL(bcom_sram_init); |
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void bcom_sram_cleanup(void) |
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{ |
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/* Free resources */ |
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if (bcom_sram) { |
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rh_destroy(bcom_sram->rh); |
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iounmap((void __iomem *)bcom_sram->base_virt); |
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release_mem_region(bcom_sram->base_phys, bcom_sram->size); |
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kfree(bcom_sram); |
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bcom_sram = NULL; |
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} |
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} |
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EXPORT_SYMBOL_GPL(bcom_sram_cleanup); |
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void* bcom_sram_alloc(int size, int align, phys_addr_t *phys) |
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{ |
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unsigned long offset; |
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spin_lock(&bcom_sram->lock); |
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offset = rh_alloc_align(bcom_sram->rh, size, align, NULL); |
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spin_unlock(&bcom_sram->lock); |
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if (IS_ERR_VALUE(offset)) |
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return NULL; |
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*phys = bcom_sram->base_phys + offset; |
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return bcom_sram->base_virt + offset; |
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} |
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EXPORT_SYMBOL_GPL(bcom_sram_alloc); |
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void bcom_sram_free(void *ptr) |
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{ |
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unsigned long offset; |
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if (!ptr) |
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return; |
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offset = ptr - bcom_sram->base_virt; |
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spin_lock(&bcom_sram->lock); |
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rh_free(bcom_sram->rh, offset); |
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spin_unlock(&bcom_sram->lock); |
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} |
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EXPORT_SYMBOL_GPL(bcom_sram_free); |
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