b5ee900258
Let's provide an overridable default instead of having every machine class define __virt_to_bus and __bus_to_virt to the same thing. What most platforms are using is bus_addr == phys_addr so such is the default. One exception is ebsa110 which has no DMA what so ever, so the actual definition is not important except only for proper compilation. Also added a comment about the special footbridge bus translation. Let's also remove comments alluding to set_dma_addr which is not (and should not) be commonly used. Signed-off-by: Nicolas Pitre <nico@marvell.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
94 lines
3.2 KiB
C
94 lines
3.2 KiB
C
/*
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* arch/arm/plat-omap/include/mach/memory.h
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*
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* Memory map for OMAP-1510 and 1610
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*
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* Copyright (C) 2000 RidgeRun, Inc.
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* Author: Greg Lonnon <glonnon@ridgerun.com>
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*
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* This file was derived from arch/arm/mach-intergrator/include/mach/memory.h
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* Copyright (C) 1999 ARM Limited
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef __ASM_ARCH_MEMORY_H
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#define __ASM_ARCH_MEMORY_H
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/*
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* Physical DRAM offset.
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*/
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#if defined(CONFIG_ARCH_OMAP1)
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#define PHYS_OFFSET UL(0x10000000)
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#elif defined(CONFIG_ARCH_OMAP2) || defined(CONFIG_ARCH_OMAP3)
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#define PHYS_OFFSET UL(0x80000000)
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#endif
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/*
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* Bus address is physical address, except for OMAP-1510 Local Bus.
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* OMAP-1510 bus address is translated into a Local Bus address if the
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* OMAP bus type is lbus. We do the address translation based on the
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* device overriding the defaults used in the dma-mapping API.
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* Note that the is_lbus_device() test is not very efficient on 1510
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* because of the strncmp().
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*/
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#ifdef CONFIG_ARCH_OMAP15XX
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/*
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* OMAP-1510 Local Bus address offset
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*/
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#define OMAP1510_LB_OFFSET UL(0x30000000)
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#define virt_to_lbus(x) ((x) - PAGE_OFFSET + OMAP1510_LB_OFFSET)
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#define lbus_to_virt(x) ((x) - OMAP1510_LB_OFFSET + PAGE_OFFSET)
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#define is_lbus_device(dev) (cpu_is_omap15xx() && dev && (strncmp(dev->bus_id, "ohci", 4) == 0))
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#define __arch_page_to_dma(dev, page) ({is_lbus_device(dev) ? \
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(dma_addr_t)virt_to_lbus(page_address(page)) : \
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(dma_addr_t)__virt_to_phys(page_address(page));})
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#define __arch_dma_to_virt(dev, addr) ({ (void *) (is_lbus_device(dev) ? \
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lbus_to_virt(addr) : \
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__phys_to_virt(addr)); })
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#define __arch_virt_to_dma(dev, addr) ({ unsigned long __addr = (unsigned long)(addr); \
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(dma_addr_t) (is_lbus_device(dev) ? \
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virt_to_lbus(__addr) : \
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__virt_to_phys(__addr)); })
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#endif /* CONFIG_ARCH_OMAP15XX */
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/* Override the ARM default */
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#ifdef CONFIG_FB_OMAP_CONSISTENT_DMA_SIZE
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#if (CONFIG_FB_OMAP_CONSISTENT_DMA_SIZE == 0)
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#undef CONFIG_FB_OMAP_CONSISTENT_DMA_SIZE
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#define CONFIG_FB_OMAP_CONSISTENT_DMA_SIZE 2
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#endif
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#define CONSISTENT_DMA_SIZE \
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(((CONFIG_FB_OMAP_CONSISTENT_DMA_SIZE + 1) & ~1) * 1024 * 1024)
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#endif
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#endif
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