mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-25 19:35:07 +07:00
d2912cb15b
Based on 2 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 version 2 as published by the free software foundation 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 # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
174 lines
3.9 KiB
C
174 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Port on Texas Instruments TMS320C6x architecture
|
|
*
|
|
* Copyright (C) 2004, 2009, 2010, 2011 Texas Instruments Incorporated
|
|
* Author: Aurelien Jacquiot <aurelien.jacquiot@ti.com>
|
|
*
|
|
* 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-noncoherent.h>
|
|
#include <linux/memblock.h>
|
|
|
|
#include <asm/cacheflush.h>
|
|
#include <asm/page.h>
|
|
#include <asm/setup.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 *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *handle,
|
|
gfp_t gfp, unsigned long attrs)
|
|
{
|
|
void *ret;
|
|
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;
|
|
|
|
ret = phys_to_virt(paddr);
|
|
memset(ret, 0, 1 << order);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Free DMA coherent memory as defined by the above mapping.
|
|
*/
|
|
void arch_dma_free(struct device *dev, size_t size, void *vaddr,
|
|
dma_addr_t dma_handle, unsigned long attrs)
|
|
{
|
|
int order;
|
|
|
|
if (!dma_size || !size)
|
|
return;
|
|
|
|
order = get_count_order(((size - 1) >> PAGE_SHIFT) + 1);
|
|
|
|
__free_dma_pages(virt_to_phys(vaddr), order);
|
|
}
|
|
|
|
/*
|
|
* Initialise the coherent DMA memory allocator using the given uncached region.
|
|
*/
|
|
void __init coherent_mem_init(phys_addr_t start, u32 size)
|
|
{
|
|
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;
|
|
|
|
dma_bitmap = memblock_alloc(BITS_TO_LONGS(dma_pages) * sizeof(long),
|
|
sizeof(long));
|
|
if (!dma_bitmap)
|
|
panic("%s: Failed to allocate %zu bytes align=0x%zx\n",
|
|
__func__, BITS_TO_LONGS(dma_pages) * sizeof(long),
|
|
sizeof(long));
|
|
}
|
|
|
|
static void c6x_dma_sync(struct device *dev, phys_addr_t paddr, size_t size,
|
|
enum dma_data_direction dir)
|
|
{
|
|
BUG_ON(!valid_dma_direction(dir));
|
|
|
|
switch (dir) {
|
|
case DMA_FROM_DEVICE:
|
|
L2_cache_block_invalidate(paddr, paddr + size);
|
|
break;
|
|
case DMA_TO_DEVICE:
|
|
L2_cache_block_writeback(paddr, paddr + size);
|
|
break;
|
|
case DMA_BIDIRECTIONAL:
|
|
L2_cache_block_writeback_invalidate(paddr, paddr + size);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
void arch_sync_dma_for_device(struct device *dev, phys_addr_t paddr,
|
|
size_t size, enum dma_data_direction dir)
|
|
{
|
|
return c6x_dma_sync(dev, paddr, size, dir);
|
|
}
|
|
|
|
void arch_sync_dma_for_cpu(struct device *dev, phys_addr_t paddr,
|
|
size_t size, enum dma_data_direction dir)
|
|
{
|
|
return c6x_dma_sync(dev, paddr, size, dir);
|
|
}
|