Commit 868ea0c9 authored by Mark A. Greer's avatar Mark A. Greer Committed by Paul Mackerras
Browse files

[POWERPC] mpic: add support for serial mode interrupts 



On Tue, Jun 20, 2006 at 02:01:26PM +1000, Benjamin Herrenschmidt wrote:
> On Mon, 2006-06-19 at 13:08 -0700, Mark A. Greer wrote:
> > MPC10x-style interrupt controllers have a serial mode that allows
> > several interrupts to be clocked in through one INT signal.
> >
> > This patch adds the software support for that mode.
>
> You hard code the clock ratio... why not add a separate call to be
> called after mpic_init,
> something like mpic_set_serial_int(int mpic, int enable, int
> clock_ratio) ?

How's this?
--

MPC10x-style interrupt controllers have a serial mode that allows
several interrupts to be clocked in through one INT signal.

This patch adds the software support for that mode.

Signed-off-by: default avatarMark A. Greer <mgreer@mvista.com>
--

 arch/powerpc/sysdev/mpic.c |   20 ++++++++++++++++++++
 include/asm-powerpc/mpic.h |   10 ++++++++++
 2 files changed, 30 insertions(+)
--
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 0aa8d15b

arch/powerpc/sysdev/mpic.c

+20 −0
Original line number Diff line number Diff line
@@ -829,7 +829,27 @@ void __init mpic_init(struct mpic *mpic) 
	mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0);

}



void __init mpic_set_clk_ratio(struct mpic *mpic, u32 clock_ratio)

{

	u32 v;



	v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);

	v &= ~MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO_MASK;

	v |= MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO(clock_ratio);

	mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);

}



void __init mpic_set_serial_int(struct mpic *mpic, int enable)

{

	u32 v;



	v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1);

	if (enable)

		v |= MPIC_GREG_GLOBAL_CONF_1_SIE;

	else

		v &= ~MPIC_GREG_GLOBAL_CONF_1_SIE;

	mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v);

}



void mpic_irq_set_priority(unsigned int irq, unsigned int pri)

{

include/asm-powerpc/mpic.h

+10 −0
Original line number Diff line number Diff line
@@ -22,6 +22,10 @@ 
#define		MPIC_GREG_GCONF_8259_PTHROU_DIS		0x20000000

#define		MPIC_GREG_GCONF_BASE_MASK		0x000fffff

#define MPIC_GREG_GLOBAL_CONF_1		0x00030

#define		MPIC_GREG_GLOBAL_CONF_1_SIE		0x08000000

#define		MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO_MASK	0x70000000

#define		MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO(r)	\

			(((r) << 28) & MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO_MASK)

#define MPIC_GREG_VENDOR_0		0x00040

#define MPIC_GREG_VENDOR_1		0x00050

#define MPIC_GREG_VENDOR_2		0x00060
@@ -284,6 +288,12 @@ extern int mpic_get_one_irq(struct mpic *mpic, struct pt_regs *regs); 
/* This one gets to the primary mpic */

extern int mpic_get_irq(struct pt_regs *regs);



/* Set the EPIC clock ratio */

void mpic_set_clk_ratio(struct mpic *mpic, u32 clock_ratio);



/* Enable/Disable EPIC serial interrupt mode */

void mpic_set_serial_int(struct mpic *mpic, int enable);



/* global mpic for pSeries */

extern struct mpic *pSeries_mpic;

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