/*
* arch/ppc/syslib/xilinx_pic.c
*
* Interrupt controller driver for Xilinx Virtex-II Pro.
*
* Author: MontaVista Software, Inc.
* source@mvista.com
*
* 2002-2004 (c) MontaVista Software, Inc. This file is licensed under
* the terms of the GNU General Public License version 2. This program
* is licensed "as is" without any warranty of any kind, whether express
* or implied.
*/
#include <linux/init.h>
#include <linux/irq.h>
#include <asm/io.h>
#include <asm/xparameters.h>
#include <asm/ibm4xx.h>
/* No one else should require these constants, so define them locally here. */
#define ISR 0 /* Interrupt Status Register */
#define IPR 1 /* Interrupt Pending Register */
#define IER 2 /* Interrupt Enable Register */
#define IAR 3 /* Interrupt Acknowledge Register */
#define SIE 4 /* Set Interrupt Enable bits */
#define CIE 5 /* Clear Interrupt Enable bits */
#define IVR 6 /* Interrupt Vector Register */
#define MER 7 /* Master Enable Register */
#if XPAR_XINTC_USE_DCR == 0
static volatile u32 *intc;
#define intc_out_be32(addr, mask) out_be32((addr), (mask))
#define intc_in_be32(addr) in_be32((addr))
#else
#define intc XPAR_INTC_0_BASEADDR
#define intc_out_be32(addr, mask) mtdcr((addr), (mask))
#define intc_in_be32(addr) mfdcr((addr))
#endif
static void
xilinx_intc_enable(unsigned int irq)
{
unsigned long mask = (0x00000001 << (irq & 31));
pr_debug("enable: %d\n", irq);
intc_out_be32(intc + SIE, mask);
}
static void
xilinx_intc_disable(unsigned int irq)
{
unsigned long mask = (0x00000001 << (irq & 31));
pr_debug("disable: %d\n", irq);
intc_out_be32(intc + CIE, mask);
}
static void
xilinx_intc_disable_and_ack(unsigned int irq)
{
unsigned long mask = (0x00000001 << (irq & 31));
pr_debug("disable_and_ack: %d\n", irq);
intc_out_be32(intc + CIE, mask);
if (!(irq_desc[irq].status & IRQ_LEVEL))
intc_out_be32(intc + IAR, mask); /* ack edge triggered intr */
}
static void
xilinx_intc_end(unsigned int irq)
{
unsigned long mask = (0x00000001 << (irq & 31));
pr_debug("end: %d\n", irq);
if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
intc_out_be32(intc + SIE, mask);
/* ack level sensitive intr */
if (irq_desc[irq].status & IRQ_LEVEL)
intc_out_be32(intc + IAR, mask);
}
}
static struct hw_interrupt_type xilinx_intc = {
.typename = "Xilinx Interrupt Controller",
.enable = xilinx_intc_enable,
.disable = xilinx_intc_disable,
.ack = xilinx_intc_disable_and_ack,
.end = xilinx_intc_end,
};
int
xilinx_pic_get_irq(struct pt_regs *regs)
{
int irq;
/*
* NOTE: This function is the one that needs to be improved in
* order to handle multiple interrupt controllers. It currently
* is hardcoded to check for interrupts only on the first INTC.
*/
irq = intc_in_be32(intc + IVR);
if (irq != -1)
irq = irq;
pr_debug("get_irq: %d\n", irq);
return (irq);
}
void __init
ppc4xx_pic_init(void)
{
int i;
/*
* NOTE: The assumption here is that NR_IRQS is 32 or less
* (NR_IRQS is 32 for PowerPC 405 cores by default).
*/
#if (NR_IRQS > 32)
#error NR_IRQS > 32 not supported
#endif
#if XPAR_XINTC_USE_DCR == 0
intc = ioremap(XPAR_INTC_0_BASEADDR, 32);
printk(KERN_INFO "Xilinx INTC #0 at 0x%08lX mapped to 0x%08lX\n",
(unsigned long) XPAR_INTC_0_BASEADDR, (unsigned long) intc);
#else
printk(KERN_INFO "Xilinx INTC #0 at 0x%08lX (DCR)\n",
(unsigned long) XPAR_INTC_0_BASEADDR);
#endif
/*
* Disable all external interrupts until they are
* explicity requested.
*/
intc_out_be32(intc + IER, 0);
/* Acknowledge any pending interrupts just in case. */
intc_out_be32(intc + IAR, ~(u32) 0);
/* Turn on the Master Enable. */
intc_out_be32(intc + MER, 0x3UL);
ppc_md.get_irq = xilinx_pic_get_irq;
for (i = 0; i < NR_IRQS; ++i) {
irq_desc[i].handler = &xilinx_intc;
if (XPAR_INTC_0_KIND_OF_INTR & (0x00000001 << i))
irq_desc[i].status &= ~IRQ_LEVEL;
else
irq_desc[i].status |= IRQ_LEVEL;
}
}
