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sh: use declared coherent memory for dreamcast pci ethernet adapter

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This patch makes the dreamcast use the recently added declared coherent
memory functions to point out the memory window suitable for dma.

Apart from cleaning up, this gives the dreamcast a proper memory allocator
for pci dma memory.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm 2008-01-24 18:40:50 +09:00 committed by Paul Mundt
parent f93e97eaea
commit a724605cb7
4 changed files with 11 additions and 80 deletions
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8
arch/sh/boards/dreamcast/setup.c
View File

@ -33,9 +33,6 @@ extern void aica_time_init(void);
extern int gapspci_init(void);
extern int systemasic_irq_demux(int);
void *dreamcast_consistent_alloc(struct device *, size_t, dma_addr_t *, gfp_t);
int dreamcast_consistent_free(struct device *, size_t, void *, dma_addr_t);
static void __init dreamcast_setup(char **cmdline_p)
{
int i;
@ -64,9 +61,4 @@ static struct sh_machine_vector mv_dreamcast __initmv = {
.mv_name = "Sega Dreamcast",
.mv_setup = dreamcast_setup,
.mv_irq_demux = systemasic_irq_demux,
#ifdef CONFIG_PCI
.mv_consistent_alloc = dreamcast_consistent_alloc,
.mv_consistent_free = dreamcast_consistent_free,
#endif
};

3
arch/sh/drivers/pci/Makefile
View File

@ -12,8 +12,7 @@ obj-$(CONFIG_CPU_SUBTYPE_SH7780) += pci-sh7780.o ops-sh4.o
obj-$(CONFIG_CPU_SUBTYPE_SH7785) += pci-sh7780.o ops-sh4.o
obj-$(CONFIG_CPU_SH5) += pci-sh5.o ops-sh5.o
obj-$(CONFIG_SH_DREAMCAST) += ops-dreamcast.o fixups-dreamcast.o \
dma-dreamcast.o
obj-$(CONFIG_SH_DREAMCAST) += ops-dreamcast.o fixups-dreamcast.o
obj-$(CONFIG_SH_SECUREEDGE5410) += ops-snapgear.o
obj-$(CONFIG_SH_RTS7751R2D) += ops-rts7751r2d.o fixups-rts7751r2d.o
obj-$(CONFIG_SH_SH03) += ops-sh03.o fixups-sh03.o

70
arch/sh/drivers/pci/dma-dreamcast.c
View File

@ -1,70 +0,0 @@
/*
* arch/sh/drivers/pci/dma-dreamcast.c
*
* PCI DMA support for the Sega Dreamcast
*
* Copyright (C) 2001, 2002 M. R. Brown
* Copyright (C) 2002, 2003 Paul Mundt
*
* This file originally bore the message (with enclosed-$):
* Id: pci.c,v 1.3 2003/05/04 19:29:46 lethal Exp
* Dreamcast PCI: Supports SEGA Broadband Adaptor only.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <linux/device.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/mach/pci.h>
static int gapspci_dma_used = 0;
void *dreamcast_consistent_alloc(struct device *dev, size_t size,
dma_addr_t *dma_handle, gfp_t flag)
{
unsigned long buf;
if (dev && dev->bus != &pci_bus_type)
return NULL;
if (gapspci_dma_used + size > GAPSPCI_DMA_SIZE)
return ERR_PTR(-EINVAL);
buf = GAPSPCI_DMA_BASE + gapspci_dma_used;
gapspci_dma_used = PAGE_ALIGN(gapspci_dma_used+size);
*dma_handle = (dma_addr_t)buf;
buf = P2SEGADDR(buf);
/* Flush the dcache before we hand off the buffer */
__flush_purge_region((void *)buf, size);
return (void *)buf;
}
int dreamcast_consistent_free(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle)
{
if (dev && dev->bus != &pci_bus_type)
return -EINVAL;
/* XXX */
gapspci_dma_used = 0;
return 0;
}

10
arch/sh/drivers/pci/fixups-dreamcast.c
View File

@ -22,6 +22,7 @@
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/pci.h>
#include <linux/dma-mapping.h>
#include <asm/io.h>
#include <asm/irq.h>
@ -40,6 +41,15 @@ static void __init gapspci_fixup_resources(struct pci_dev *dev)
*/
dev->resource[1].start = p->io_resource->start + 0x100;
dev->resource[1].end = dev->resource[1].start + 0x200 - 1;
/*
* Redirect dma memory allocations to special memory window.
*/
BUG_ON(!dma_declare_coherent_memory(&dev->dev,
GAPSPCI_DMA_BASE,
GAPSPCI_DMA_BASE,
GAPSPCI_DMA_SIZE,
DMA_MEMORY_MAP |
DMA_MEMORY_EXCLUSIVE));
break;
default:
printk("PCI: Failed resource fixup\n");