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MIPS: Alchemy: devboards: factor out PB1200 IRQ cascade code. 

Move the PB1200 IRQ cascade code out to the BCSR support code:
upcoming DB1300 support can use it too.

Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Manuel Lauss 2009-10-04 14:55:25 +02:00 committed by Ralf Baechle
parent 9bdcf336d0
commit 95a437966d
3 changed files with 76 additions and 70 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

72
arch/mips/alchemy/devboards/bcsr.c
View File

@ -7,6 +7,7 @@
* All registers are 16bits wide with 32bit spacing.
*/
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/spinlock.h>
#include <asm/addrspace.h>
@ -18,6 +19,9 @@ static struct bcsr_reg {
spinlock_t lock;
} bcsr_regs[BCSR_CNT];
static void __iomem *bcsr_virt; /* KSEG1 addr of BCSR base */
static int bcsr_csc_base; /* linux-irq of first cascaded irq */
void __init bcsr_init(unsigned long bcsr1_phys, unsigned long bcsr2_phys)
{
int i;
@ -25,6 +29,8 @@ void __init bcsr_init(unsigned long bcsr1_phys, unsigned long bcsr2_phys)
bcsr1_phys = KSEG1ADDR(CPHYSADDR(bcsr1_phys));
bcsr2_phys = KSEG1ADDR(CPHYSADDR(bcsr2_phys));
bcsr_virt = (void __iomem *)bcsr1_phys;
for (i = 0; i < BCSR_CNT; i++) {
if (i >= BCSR_HEXLEDS)
bcsr_regs[i].raddr = (void __iomem *)bcsr2_phys +
@ -74,3 +80,69 @@ void bcsr_mod(enum bcsr_id reg, unsigned short clr, unsigned short set)
spin_unlock_irqrestore(&bcsr_regs[reg].lock, flags);
}
EXPORT_SYMBOL_GPL(bcsr_mod);
/*
* DB1200/PB1200 CPLD IRQ muxer
*/
static void bcsr_csc_handler(unsigned int irq, struct irq_desc *d)
{
unsigned short bisr = __raw_readw(bcsr_virt + BCSR_REG_INTSTAT);
for ( ; bisr; bisr &= bisr - 1)
generic_handle_irq(bcsr_csc_base + __ffs(bisr));
}
/* NOTE: both the enable and mask bits must be cleared, otherwise the
* CPLD generates tons of spurious interrupts (at least on my DB1200).
* -- mlau
*/
static void bcsr_irq_mask(unsigned int irq_nr)
{
unsigned short v = 1 << (irq_nr - bcsr_csc_base);
__raw_writew(v, bcsr_virt + BCSR_REG_INTCLR);
__raw_writew(v, bcsr_virt + BCSR_REG_MASKCLR);
wmb();
}
static void bcsr_irq_maskack(unsigned int irq_nr)
{
unsigned short v = 1 << (irq_nr - bcsr_csc_base);
__raw_writew(v, bcsr_virt + BCSR_REG_INTCLR);
__raw_writew(v, bcsr_virt + BCSR_REG_MASKCLR);
__raw_writew(v, bcsr_virt + BCSR_REG_INTSTAT); /* ack */
wmb();
}
static void bcsr_irq_unmask(unsigned int irq_nr)
{
unsigned short v = 1 << (irq_nr - bcsr_csc_base);
__raw_writew(v, bcsr_virt + BCSR_REG_INTSET);
__raw_writew(v, bcsr_virt + BCSR_REG_MASKSET);
wmb();
}
static struct irq_chip bcsr_irq_type = {
.name = "CPLD",
.mask = bcsr_irq_mask,
.mask_ack = bcsr_irq_maskack,
.unmask = bcsr_irq_unmask,
};
void __init bcsr_init_irq(int csc_start, int csc_end, int hook_irq)
{
unsigned int irq;
/* mask & disable & ack all */
__raw_writew(0xffff, bcsr_virt + BCSR_REG_INTCLR);
__raw_writew(0xffff, bcsr_virt + BCSR_REG_MASKCLR);
__raw_writew(0xffff, bcsr_virt + BCSR_REG_INTSTAT);
wmb();
bcsr_csc_base = csc_start;
for (irq = csc_start; irq <= csc_end; irq++)
set_irq_chip_and_handler_name(irq, &bcsr_irq_type,
handle_level_irq, "level");
set_irq_chained_handler(hook_irq, bcsr_csc_handler);
}

71
arch/mips/alchemy/devboards/pb1200/irqmap.c
View File

@ -45,69 +45,11 @@ struct au1xxx_irqmap __initdata au1xxx_irq_map[] = {
{ AU1000_GPIO_7, IRQF_TRIGGER_LOW, 0 },
};
static void __iomem *bcsr_virt;
/*
* Support for External interrupts on the Pb1200 Development platform.
*/
static void pb1200_cascade_handler(unsigned int irq, struct irq_desc *d)
{
unsigned short bisr = __raw_readw(bcsr_virt + BCSR_REG_INTSTAT);
for ( ; bisr; bisr &= bisr - 1)
generic_handle_irq(PB1200_INT_BEGIN + __ffs(bisr));
}
/* NOTE: both the enable and mask bits must be cleared, otherwise the
* CPLD generates tons of spurious interrupts (at least on the DB1200).
*/
static void pb1200_mask_irq(unsigned int irq_nr)
{
unsigned short v = 1 << (irq_nr - PB1200_INT_BEGIN);
__raw_writew(v, bcsr_virt + BCSR_REG_INTCLR);
__raw_writew(v, bcsr_virt + BCSR_REG_MASKCLR);
wmb();
}
static void pb1200_maskack_irq(unsigned int irq_nr)
{
unsigned short v = 1 << (irq_nr - PB1200_INT_BEGIN);
__raw_writew(v, bcsr_virt + BCSR_REG_INTCLR);
__raw_writew(v, bcsr_virt + BCSR_REG_MASKCLR);
__raw_writew(v, bcsr_virt + BCSR_REG_INTSTAT); /* ack */
wmb();
}
static void pb1200_unmask_irq(unsigned int irq_nr)
{
unsigned short v = 1 << (irq_nr - PB1200_INT_BEGIN);
__raw_writew(v, bcsr_virt + BCSR_REG_INTSET);
__raw_writew(v, bcsr_virt + BCSR_REG_MASKSET);
wmb();
}
static struct irq_chip pb1200_cpld_irq_type = {
#ifdef CONFIG_MIPS_PB1200
.name = "Pb1200 Ext",
#endif
#ifdef CONFIG_MIPS_DB1200
.name = "Db1200 Ext",
#endif
.mask = pb1200_mask_irq,
.mask_ack = pb1200_maskack_irq,
.unmask = pb1200_unmask_irq,
};
void __init board_init_irq(void)
{
unsigned int irq;
au1xxx_setup_irqmap(au1xxx_irq_map, ARRAY_SIZE(au1xxx_irq_map));
#ifdef CONFIG_MIPS_PB1200
bcsr_virt = (void __iomem *)KSEG1ADDR(PB1200_BCSR_PHYS_ADDR);
/* We have a problem with CPLD rev 3. */
if (BCSR_WHOAMI_CPLD(bcsr_read(BCSR_WHOAMI)) <= 3) {
printk(KERN_ERR "WARNING!!!\n");
@ -127,18 +69,7 @@ void __init board_init_irq(void)
printk(KERN_ERR "WARNING!!!\n");
panic("Game over. Your score is 0.");
}
#else
bcsr_virt = (void __iomem *)KSEG1ADDR(DB1200_BCSR_PHYS_ADDR);
#endif
/* mask & disable & ack all */
bcsr_write(BCSR_INTCLR, 0xffff);
bcsr_write(BCSR_MASKCLR, 0xffff);
bcsr_write(BCSR_INTSTAT, 0xffff);
for (irq = PB1200_INT_BEGIN; irq <= PB1200_INT_END; irq++)
set_irq_chip_and_handler_name(irq, &pb1200_cpld_irq_type,
handle_level_irq, "level");
set_irq_chained_handler(AU1000_GPIO_7, pb1200_cascade_handler);
bcsr_init_irq(PB1200_INT_BEGIN, PB1200_INT_END, AU1000_GPIO_7);
}

3
arch/mips/include/asm/mach-db1x00/bcsr.h
View File

@ -232,4 +232,7 @@ void bcsr_write(enum bcsr_id reg, unsigned short val);
/* modify a register. clear bits set in 'clr', set bits set in 'set' */
void bcsr_mod(enum bcsr_id reg, unsigned short clr, unsigned short set);
/* install CPLD IRQ demuxer (DB1200/PB1200) */
void __init bcsr_init_irq(int csc_start, int csc_end, int hook_irq);
#endif