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sh: use declared coherent memory for dreamcast pci ethernet adapter 

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");