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sh: dma: Make PVR2 DMA configurable.

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With arch/sh/drivers/dma/ always being built, the Dreamcast DMA engines
are being unconditionally built in, regardless of whether the DMA API is
enabled or not. This is a regression from previous behaviour, but there
is not much advantage in building them all in unconditionally regardless.
Add a new config option to make it optional, and update the only user of
it to reflect that.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Paul Mundt 2009-03-17 09:30:36 +09:00
parent 988f831df3
commit da62e71d13
3 changed files with 23 additions and 9 deletions
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13
arch/sh/drivers/dma/Kconfig
View file

@ -54,4 +54,17 @@ config SH_DMABRG
of the SH7760.
Say Y if you want to use Audio/USB DMA on your SH7760 board.
config PVR2_DMA
tristate "PowerVR 2 DMAC support"
depends on SH_DREAMCAST && SH_DMA
help
Selecting this will enable support for the PVR2 DMA controller.
As this chains off of the on-chip DMAC, that must also be
enabled by default.
This is primarily used by the pvr2fb framebuffer driver for
certain optimizations, but is not necessary for functionality.
If in doubt, say N.
endmenu

3
arch/sh/drivers/dma/Makefile
View file

@ -4,5 +4,6 @@
obj-$(CONFIG_SH_DMA_API) += dma-api.o dma-sysfs.o
obj-$(CONFIG_SH_DMA) += dma-sh.o
obj-$(CONFIG_SH_DREAMCAST) += dma-pvr2.o dma-g2.o
obj-$(CONFIG_SH_DREAMCAST) += dma-g2.o
obj-$(CONFIG_PVR2_DMA) += dma-pvr2.o
obj-$(CONFIG_SH_DMABRG) += dmabrg.o

16
drivers/video/pvr2fb.c
View file

@ -61,7 +61,7 @@
#include <mach-dreamcast/mach/sysasic.h>
#endif
#ifdef CONFIG_SH_DMA
#ifdef CONFIG_PVR2_DMA
#include <linux/pagemap.h>
#include <mach/dma.h>
#include <asm/dma.h>
@ -188,7 +188,7 @@ static unsigned int is_blanked = 0; /* Is the screen blanked? */
static unsigned long pvr2fb_map;
#endif
#ifdef CONFIG_SH_DMA
#ifdef CONFIG_PVR2_DMA
static unsigned int shdma = PVR2_CASCADE_CHAN;
static unsigned int pvr2dma = ONCHIP_NR_DMA_CHANNELS;
#endif
@ -207,7 +207,7 @@ static irqreturn_t pvr2fb_interrupt(int irq, void *dev_id);
static int pvr2_init_cable(void);
static int pvr2_get_param(const struct pvr2_params *p, const char *s,
int val, int size);
#ifdef CONFIG_SH_DMA
#ifdef CONFIG_PVR2_DMA
static ssize_t pvr2fb_write(struct fb_info *info, const char *buf,
size_t count, loff_t *ppos);
#endif
@ -218,7 +218,7 @@ static struct fb_ops pvr2fb_ops = {
.fb_blank = pvr2fb_blank,
.fb_check_var = pvr2fb_check_var,
.fb_set_par = pvr2fb_set_par,
#ifdef CONFIG_SH_DMA
#ifdef CONFIG_PVR2_DMA
.fb_write = pvr2fb_write,
#endif
.fb_fillrect = cfb_fillrect,
@ -671,7 +671,7 @@ static int pvr2_init_cable(void)
return cable_type;
}
#ifdef CONFIG_SH_DMA
#ifdef CONFIG_PVR2_DMA
static ssize_t pvr2fb_write(struct fb_info *info, const char *buf,
size_t count, loff_t *ppos)
{
@ -743,7 +743,7 @@ out_unmap:
return ret;
}
#endif /* CONFIG_SH_DMA */
#endif /* CONFIG_PVR2_DMA */
/**
* pvr2fb_common_init
@ -893,7 +893,7 @@ static int __init pvr2fb_dc_init(void)
return -EBUSY;
}
#ifdef CONFIG_SH_DMA
#ifdef CONFIG_PVR2_DMA
if (request_dma(pvr2dma, "pvr2") != 0) {
free_irq(HW_EVENT_VSYNC, 0);
return -EBUSY;
@ -915,7 +915,7 @@ static void __exit pvr2fb_dc_exit(void)
}
free_irq(HW_EVENT_VSYNC, 0);
#ifdef CONFIG_SH_DMA
#ifdef CONFIG_PVR2_DMA
free_dma(pvr2dma);
#endif
}