diff options
Diffstat (limited to 'arch/c6x/mm')
-rw-r--r-- | arch/c6x/mm/Makefile | 5 | ||||
-rw-r--r-- | arch/c6x/mm/dma-coherent.c | 143 | ||||
-rw-r--r-- | arch/c6x/mm/init.c | 113 |
3 files changed, 261 insertions, 0 deletions
diff --git a/arch/c6x/mm/Makefile b/arch/c6x/mm/Makefile new file mode 100644 index 000000000000..136a97576c61 --- /dev/null +++ b/arch/c6x/mm/Makefile @@ -0,0 +1,5 @@ +# +# Makefile for the linux c6x-specific parts of the memory manager. +# + +obj-y := init.o dma-coherent.o diff --git a/arch/c6x/mm/dma-coherent.c b/arch/c6x/mm/dma-coherent.c new file mode 100644 index 000000000000..4187e5180373 --- /dev/null +++ b/arch/c6x/mm/dma-coherent.c @@ -0,0 +1,143 @@ +/* + * Port on Texas Instruments TMS320C6x architecture + * + * Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated + * Author: Aurelien Jacquiot <aurelien.jacquiot@ti.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * DMA uncached mapping support. + * + * Using code pulled from ARM + * Copyright (C) 2000-2004 Russell King + * + */ +#include <linux/slab.h> +#include <linux/bitmap.h> +#include <linux/bitops.h> +#include <linux/module.h> +#include <linux/interrupt.h> +#include <linux/dma-mapping.h> +#include <linux/memblock.h> + +#include <asm/page.h> + +/* + * DMA coherent memory management, can be redefined using the memdma= + * kernel command line + */ + +/* none by default */ +static phys_addr_t dma_base; +static u32 dma_size; +static u32 dma_pages; + +static unsigned long *dma_bitmap; + +/* bitmap lock */ +static DEFINE_SPINLOCK(dma_lock); + +/* + * Return a DMA coherent and contiguous memory chunk from the DMA memory + */ +static inline u32 __alloc_dma_pages(int order) +{ + unsigned long flags; + u32 pos; + + spin_lock_irqsave(&dma_lock, flags); + pos = bitmap_find_free_region(dma_bitmap, dma_pages, order); + spin_unlock_irqrestore(&dma_lock, flags); + + return dma_base + (pos << PAGE_SHIFT); +} + +static void __free_dma_pages(u32 addr, int order) +{ + unsigned long flags; + u32 pos = (addr - dma_base) >> PAGE_SHIFT; + + if (addr < dma_base || (pos + (1 << order)) >= dma_pages) { + printk(KERN_ERR "%s: freeing outside range.\n", __func__); + BUG(); + } + + spin_lock_irqsave(&dma_lock, flags); + bitmap_release_region(dma_bitmap, pos, order); + spin_unlock_irqrestore(&dma_lock, flags); +} + +/* + * Allocate DMA coherent memory space and return both the kernel + * virtual and DMA address for that space. + */ +void *dma_alloc_coherent(struct device *dev, size_t size, + dma_addr_t *handle, gfp_t gfp) +{ + u32 paddr; + int order; + + if (!dma_size || !size) + return NULL; + + order = get_count_order(((size - 1) >> PAGE_SHIFT) + 1); + + paddr = __alloc_dma_pages(order); + + if (handle) + *handle = paddr; + + if (!paddr) + return NULL; + + return phys_to_virt(paddr); +} +EXPORT_SYMBOL(dma_alloc_coherent); + +/* + * Free DMA coherent memory as defined by the above mapping. + */ +void dma_free_coherent(struct device *dev, size_t size, void *vaddr, + dma_addr_t dma_handle) +{ + int order; + + if (!dma_size || !size) + return; + + order = get_count_order(((size - 1) >> PAGE_SHIFT) + 1); + + __free_dma_pages(virt_to_phys(vaddr), order); +} +EXPORT_SYMBOL(dma_free_coherent); + +/* + * Initialise the coherent DMA memory allocator using the given uncached region. + */ +void __init coherent_mem_init(phys_addr_t start, u32 size) +{ + phys_addr_t bitmap_phys; + + if (!size) + return; + + printk(KERN_INFO + "Coherent memory (DMA) region start=0x%x size=0x%x\n", + start, size); + + dma_base = start; + dma_size = size; + + /* allocate bitmap */ + dma_pages = dma_size >> PAGE_SHIFT; + if (dma_size & (PAGE_SIZE - 1)) + ++dma_pages; + + bitmap_phys = memblock_alloc(BITS_TO_LONGS(dma_pages) * sizeof(long), + sizeof(long)); + + dma_bitmap = phys_to_virt(bitmap_phys); + memset(dma_bitmap, 0, dma_pages * PAGE_SIZE); +} diff --git a/arch/c6x/mm/init.c b/arch/c6x/mm/init.c new file mode 100644 index 000000000000..89395f09648a --- /dev/null +++ b/arch/c6x/mm/init.c @@ -0,0 +1,113 @@ +/* + * Port on Texas Instruments TMS320C6x architecture + * + * Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated + * Author: Aurelien Jacquiot (aurelien.jacquiot@jaluna.com) + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ +#include <linux/mm.h> +#include <linux/swap.h> +#include <linux/module.h> +#include <linux/bootmem.h> +#ifdef CONFIG_BLK_DEV_RAM +#include <linux/blkdev.h> +#endif +#include <linux/initrd.h> + +#include <asm/sections.h> + +/* + * ZERO_PAGE is a special page that is used for zero-initialized + * data and COW. + */ +unsigned long empty_zero_page; +EXPORT_SYMBOL(empty_zero_page); + +/* + * paging_init() continues the virtual memory environment setup which + * was begun by the code in arch/head.S. + * The parameters are pointers to where to stick the starting and ending + * addresses of available kernel virtual memory. + */ +void __init paging_init(void) +{ + struct pglist_data *pgdat = NODE_DATA(0); + unsigned long zones_size[MAX_NR_ZONES] = {0, }; + + empty_zero_page = (unsigned long) alloc_bootmem_pages(PAGE_SIZE); + memset((void *)empty_zero_page, 0, PAGE_SIZE); + + /* + * Set up user data space + */ + set_fs(KERNEL_DS); + + /* + * Define zones + */ + zones_size[ZONE_NORMAL] = (memory_end - PAGE_OFFSET) >> PAGE_SHIFT; + pgdat->node_zones[ZONE_NORMAL].zone_start_pfn = + __pa(PAGE_OFFSET) >> PAGE_SHIFT; + + free_area_init(zones_size); +} + +void __init mem_init(void) +{ + int codek, datak; + unsigned long tmp; + unsigned long len = memory_end - memory_start; + + high_memory = (void *)(memory_end & PAGE_MASK); + + /* this will put all memory onto the freelists */ + totalram_pages = free_all_bootmem(); + + codek = (_etext - _stext) >> 10; + datak = (_end - _sdata) >> 10; + + tmp = nr_free_pages() << PAGE_SHIFT; + printk(KERN_INFO "Memory: %luk/%luk RAM (%dk kernel code, %dk data)\n", + tmp >> 10, len >> 10, codek, datak); +} + +#ifdef CONFIG_BLK_DEV_INITRD +void __init free_initrd_mem(unsigned long start, unsigned long end) +{ + int pages = 0; + for (; start < end; start += PAGE_SIZE) { + ClearPageReserved(virt_to_page(start)); + init_page_count(virt_to_page(start)); + free_page(start); + totalram_pages++; + pages++; + } + printk(KERN_INFO "Freeing initrd memory: %luk freed\n", + (pages * PAGE_SIZE) >> 10); +} +#endif + +void __init free_initmem(void) +{ + unsigned long addr; + + /* + * The following code should be cool even if these sections + * are not page aligned. + */ + addr = PAGE_ALIGN((unsigned long)(__init_begin)); + + /* next to check that the page we free is not a partial page */ + for (; addr + PAGE_SIZE < (unsigned long)(__init_end); + addr += PAGE_SIZE) { + ClearPageReserved(virt_to_page(addr)); + init_page_count(virt_to_page(addr)); + free_page(addr); + totalram_pages++; + } + printk(KERN_INFO "Freeing unused kernel memory: %dK freed\n", + (int) ((addr - PAGE_ALIGN((long) &__init_begin)) >> 10)); +} |