diff options
Diffstat (limited to 'arch/powerpc/sysdev/fsl_85xx_cache_sram.c')
| -rw-r--r-- | arch/powerpc/sysdev/fsl_85xx_cache_sram.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/fsl_85xx_cache_sram.c b/arch/powerpc/sysdev/fsl_85xx_cache_sram.c new file mode 100644 index 000000000000..54fb1922fe30 --- /dev/null +++ b/arch/powerpc/sysdev/fsl_85xx_cache_sram.c @@ -0,0 +1,159 @@ +/* + * Copyright 2009-2010 Freescale Semiconductor, Inc. + * + * Simple memory allocator abstraction for QorIQ (P1/P2) based Cache-SRAM + * + * Author: Vivek Mahajan <vivek.mahajan@freescale.com> + * + * This file is derived from the original work done + * by Sylvain Munaut for the Bestcomm SRAM allocator. + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#include <linux/kernel.h> +#include <linux/slab.h> +#include <linux/err.h> +#include <linux/of_platform.h> +#include <asm/pgtable.h> +#include <asm/fsl_85xx_cache_sram.h> + +#include "fsl_85xx_cache_ctlr.h" + +struct mpc85xx_cache_sram *cache_sram; + +void *mpc85xx_cache_sram_alloc(unsigned int size, + phys_addr_t *phys, unsigned int align) +{ + unsigned long offset; + unsigned long flags; + + if (unlikely(cache_sram == NULL)) + return NULL; + + if (!size || (size > cache_sram->size) || (align > cache_sram->size)) { + pr_err("%s(): size(=%x) or align(=%x) zero or too big\n", + __func__, size, align); + return NULL; + } + + if ((align & (align - 1)) || align <= 1) { + pr_err("%s(): align(=%x) must be power of two and >1\n", + __func__, align); + return NULL; + } + + spin_lock_irqsave(&cache_sram->lock, flags); + offset = rh_alloc_align(cache_sram->rh, size, align, NULL); + spin_unlock_irqrestore(&cache_sram->lock, flags); + + if (IS_ERR_VALUE(offset)) + return NULL; + + *phys = cache_sram->base_phys + offset; + + return (unsigned char *)cache_sram->base_virt + offset; +} +EXPORT_SYMBOL(mpc85xx_cache_sram_alloc); + +void mpc85xx_cache_sram_free(void *ptr) +{ + unsigned long flags; + BUG_ON(!ptr); + + spin_lock_irqsave(&cache_sram->lock, flags); + rh_free(cache_sram->rh, ptr - cache_sram->base_virt); + spin_unlock_irqrestore(&cache_sram->lock, flags); +} +EXPORT_SYMBOL(mpc85xx_cache_sram_free); + +int __init instantiate_cache_sram(struct platform_device *dev, + struct sram_parameters sram_params) +{ + int ret = 0; + + if (cache_sram) { + dev_err(&dev->dev, "Already initialized cache-sram\n"); + return -EBUSY; + } + + cache_sram = kzalloc(sizeof(struct mpc85xx_cache_sram), GFP_KERNEL); + if (!cache_sram) { + dev_err(&dev->dev, "Out of memory for cache_sram structure\n"); + return -ENOMEM; + } + + cache_sram->base_phys = sram_params.sram_offset; + cache_sram->size = sram_params.sram_size; + + if (!request_mem_region(cache_sram->base_phys, cache_sram->size, + "fsl_85xx_cache_sram")) { + dev_err(&dev->dev, "%s: request memory failed\n", + dev->dev.of_node->full_name); + ret = -ENXIO; + goto out_free; + } + + cache_sram->base_virt = ioremap_flags(cache_sram->base_phys, + cache_sram->size, _PAGE_COHERENT | PAGE_KERNEL); + if (!cache_sram->base_virt) { + dev_err(&dev->dev, "%s: ioremap_flags failed\n", + dev->dev.of_node->full_name); + ret = -ENOMEM; + goto out_release; + } + + cache_sram->rh = rh_create(sizeof(unsigned int)); + if (IS_ERR(cache_sram->rh)) { + dev_err(&dev->dev, "%s: Unable to create remote heap\n", + dev->dev.of_node->full_name); + ret = PTR_ERR(cache_sram->rh); + goto out_unmap; + } + + rh_attach_region(cache_sram->rh, 0, cache_sram->size); + spin_lock_init(&cache_sram->lock); + + dev_info(&dev->dev, "[base:0x%llx, size:0x%x] configured and loaded\n", + (unsigned long long)cache_sram->base_phys, cache_sram->size); + + return 0; + +out_unmap: + iounmap(cache_sram->base_virt); + +out_release: + release_mem_region(cache_sram->base_phys, cache_sram->size); + +out_free: + kfree(cache_sram); + return ret; +} + +void remove_cache_sram(struct platform_device *dev) +{ + BUG_ON(!cache_sram); + + rh_detach_region(cache_sram->rh, 0, cache_sram->size); + rh_destroy(cache_sram->rh); + + iounmap(cache_sram->base_virt); + release_mem_region(cache_sram->base_phys, cache_sram->size); + + kfree(cache_sram); + cache_sram = NULL; + + dev_info(&dev->dev, "MPC85xx Cache-SRAM driver unloaded\n"); +} |