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viafb: Add a simple interrupt management infrastructure 

The viafb device shares a single interrupt control register among several
distinct subunits.  This adds a simple layer for management of that
register.

Cc: ScottFang@viatech.com.cn
Cc: JosephChan@via.com.tw
Cc: Harald Welte <laforge@gnumonks.org>
Acked-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Jonathan Corbet 2010-04-23 09:46:59 -06:00
parent 6b841edf57
commit 94dd1a856b
2 changed files with 107 additions and 1 deletions
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64
drivers/video/via/via-core.c
View File

@ -34,6 +34,65 @@ static struct via_port_cfg adap_configs[] = {
static struct viafb_dev global_dev;
/*
* Basic register access; spinlock required.
*/
static inline void viafb_mmio_write(int reg, u32 v)
{
iowrite32(v, global_dev.engine_mmio + reg);
}
static inline int viafb_mmio_read(int reg)
{
return ioread32(global_dev.engine_mmio + reg);
}
/* ---------------------------------------------------------------------- */
/*
* Interrupt management. We have a single IRQ line for a lot of
* different functions, so we need to share it. The design here
* is that we don't want to reimplement the shared IRQ code here;
* we also want to avoid having contention for a single handler thread.
* So each subdev driver which needs interrupts just requests
* them directly from the kernel. We just have what's needed for
* overall access to the interrupt control register.
*/
/*
* Which interrupts are enabled now?
*/
static u32 viafb_enabled_ints;
static void viafb_int_init(void)
{
viafb_enabled_ints = 0;
viafb_mmio_write(VDE_INTERRUPT, 0);
}
/*
* Allow subdevs to ask for specific interrupts to be enabled. These
* functions must be called with reg_lock held
*/
void viafb_irq_enable(u32 mask)
{
viafb_enabled_ints |= mask;
viafb_mmio_write(VDE_INTERRUPT, viafb_enabled_ints | VDE_I_ENABLE);
}
EXPORT_SYMBOL_GPL(viafb_irq_enable);
void viafb_irq_disable(u32 mask)
{
viafb_enabled_ints &= ~mask;
if (viafb_enabled_ints == 0)
viafb_mmio_write(VDE_INTERRUPT, 0); /* Disable entirely */
else
viafb_mmio_write(VDE_INTERRUPT,
viafb_enabled_ints | VDE_I_ENABLE);
}
EXPORT_SYMBOL_GPL(viafb_irq_disable);
/*
* Figure out how big our framebuffer memory is. Kind of ugly,
* but evidently we can't trust the information found in the
@ -275,8 +334,10 @@ static int __devinit via_pci_probe(struct pci_dev *pdev,
if (ret)
goto out_disable;
/*
* Create our subdevices. Continue even if some things fail.
* Set up interrupts and create our subdevices. Continue even if
* some things fail.
*/
viafb_int_init();
via_setup_subdevs(&global_dev);
/*
* Set up the framebuffer.
@ -284,6 +345,7 @@ static int __devinit via_pci_probe(struct pci_dev *pdev,
ret = via_fb_pci_probe(&global_dev);
if (ret)
goto out_subdevs;
return 0;
out_subdevs:

44
drivers/video/via/via-core.h
View File

@ -87,4 +87,48 @@ struct viafb_dev {
};
/*
* Interrupt management.
*/
void viafb_irq_enable(u32 mask);
void viafb_irq_disable(u32 mask);
/*
* The global interrupt control register and its bits.
*/
#define VDE_INTERRUPT 0x200 /* Video interrupt flags/masks */
#define VDE_I_DVISENSE 0x00000001 /* DVI sense int status */
#define VDE_I_VBLANK 0x00000002 /* Vertical blank status */
#define VDE_I_MCCFI 0x00000004 /* MCE compl. frame int status */
#define VDE_I_VSYNC 0x00000008 /* VGA VSYNC int status */
#define VDE_I_DMA0DDONE 0x00000010 /* DMA 0 descr done */
#define VDE_I_DMA0TDONE 0x00000020 /* DMA 0 transfer done */
#define VDE_I_DMA1DDONE 0x00000040 /* DMA 1 descr done */
#define VDE_I_DMA1TDONE 0x00000080 /* DMA 1 transfer done */
#define VDE_I_C1AV 0x00000100 /* Cap Eng 1 act vid end */
#define VDE_I_HQV0 0x00000200 /* First HQV engine */
#define VDE_I_HQV1 0x00000400 /* Second HQV engine */
#define VDE_I_HQV1EN 0x00000800 /* Second HQV engine enable */
#define VDE_I_C0AV 0x00001000 /* Cap Eng 0 act vid end */
#define VDE_I_C0VBI 0x00002000 /* Cap Eng 0 VBI end */
#define VDE_I_C1VBI 0x00004000 /* Cap Eng 1 VBI end */
#define VDE_I_VSYNC2 0x00008000 /* Sec. Disp. VSYNC */
#define VDE_I_DVISNSEN 0x00010000 /* DVI sense enable */
#define VDE_I_VSYNC2EN 0x00020000 /* Sec Disp VSYNC enable */
#define VDE_I_MCCFIEN 0x00040000 /* MC comp frame int mask enable */
#define VDE_I_VSYNCEN 0x00080000 /* VSYNC enable */
#define VDE_I_DMA0DDEN 0x00100000 /* DMA 0 descr done enable */
#define VDE_I_DMA0TDEN 0x00200000 /* DMA 0 trans done enable */
#define VDE_I_DMA1DDEN 0x00400000 /* DMA 1 descr done enable */
#define VDE_I_DMA1TDEN 0x00800000 /* DMA 1 trans done enable */
#define VDE_I_C1AVEN 0x01000000 /* cap 1 act vid end enable */
#define VDE_I_HQV0EN 0x02000000 /* First hqv engine enable */
#define VDE_I_C1VBIEN 0x04000000 /* Cap 1 VBI end enable */
#define VDE_I_LVDSSI 0x08000000 /* LVDS sense interrupt */
#define VDE_I_C0AVEN 0x10000000 /* Cap 0 act vid end enable */
#define VDE_I_C0VBIEN 0x20000000 /* Cap 0 VBI end enable */
#define VDE_I_LVDSSIEN 0x40000000 /* LVDS Sense enable */
#define VDE_I_ENABLE 0x80000000 /* Global interrupt enable */
#endif /* __VIA_CORE_H__ */