1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
157 lines
3.9 KiB
C
157 lines
3.9 KiB
C
/*
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* arch/ppc/syslib/xilinx_pic.c
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*
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* Interrupt controller driver for Xilinx Virtex-II Pro.
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*
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* Author: MontaVista Software, Inc.
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* source@mvista.com
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*
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* 2002-2004 (c) MontaVista Software, Inc. This file is licensed under
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* the terms of the GNU General Public License version 2. This program
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* is licensed "as is" without any warranty of any kind, whether express
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* or implied.
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*/
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#include <linux/init.h>
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#include <linux/irq.h>
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#include <asm/io.h>
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#include <asm/xparameters.h>
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#include <asm/ibm4xx.h>
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/* No one else should require these constants, so define them locally here. */
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#define ISR 0 /* Interrupt Status Register */
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#define IPR 1 /* Interrupt Pending Register */
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#define IER 2 /* Interrupt Enable Register */
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#define IAR 3 /* Interrupt Acknowledge Register */
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#define SIE 4 /* Set Interrupt Enable bits */
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#define CIE 5 /* Clear Interrupt Enable bits */
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#define IVR 6 /* Interrupt Vector Register */
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#define MER 7 /* Master Enable Register */
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#if XPAR_XINTC_USE_DCR == 0
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static volatile u32 *intc;
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#define intc_out_be32(addr, mask) out_be32((addr), (mask))
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#define intc_in_be32(addr) in_be32((addr))
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#else
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#define intc XPAR_INTC_0_BASEADDR
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#define intc_out_be32(addr, mask) mtdcr((addr), (mask))
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#define intc_in_be32(addr) mfdcr((addr))
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#endif
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static void
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xilinx_intc_enable(unsigned int irq)
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{
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unsigned long mask = (0x00000001 << (irq & 31));
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pr_debug("enable: %d\n", irq);
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intc_out_be32(intc + SIE, mask);
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}
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static void
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xilinx_intc_disable(unsigned int irq)
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{
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unsigned long mask = (0x00000001 << (irq & 31));
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pr_debug("disable: %d\n", irq);
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intc_out_be32(intc + CIE, mask);
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}
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static void
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xilinx_intc_disable_and_ack(unsigned int irq)
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{
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unsigned long mask = (0x00000001 << (irq & 31));
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pr_debug("disable_and_ack: %d\n", irq);
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intc_out_be32(intc + CIE, mask);
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if (!(irq_desc[irq].status & IRQ_LEVEL))
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intc_out_be32(intc + IAR, mask); /* ack edge triggered intr */
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}
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static void
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xilinx_intc_end(unsigned int irq)
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{
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unsigned long mask = (0x00000001 << (irq & 31));
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pr_debug("end: %d\n", irq);
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if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) {
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intc_out_be32(intc + SIE, mask);
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/* ack level sensitive intr */
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if (irq_desc[irq].status & IRQ_LEVEL)
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intc_out_be32(intc + IAR, mask);
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}
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}
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static struct hw_interrupt_type xilinx_intc = {
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"Xilinx Interrupt Controller",
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NULL,
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NULL,
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xilinx_intc_enable,
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xilinx_intc_disable,
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xilinx_intc_disable_and_ack,
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xilinx_intc_end,
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0
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};
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int
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xilinx_pic_get_irq(struct pt_regs *regs)
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{
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int irq;
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/*
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* NOTE: This function is the one that needs to be improved in
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* order to handle multiple interrupt controllers. It currently
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* is hardcoded to check for interrupts only on the first INTC.
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*/
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irq = intc_in_be32(intc + IVR);
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if (irq != -1)
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irq = irq;
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pr_debug("get_irq: %d\n", irq);
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return (irq);
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}
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void __init
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ppc4xx_pic_init(void)
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{
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int i;
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/*
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* NOTE: The assumption here is that NR_IRQS is 32 or less
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* (NR_IRQS is 32 for PowerPC 405 cores by default).
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*/
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#if (NR_IRQS > 32)
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#error NR_IRQS > 32 not supported
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#endif
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#if XPAR_XINTC_USE_DCR == 0
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intc = ioremap(XPAR_INTC_0_BASEADDR, 32);
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printk(KERN_INFO "Xilinx INTC #0 at 0x%08lX mapped to 0x%08lX\n",
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(unsigned long) XPAR_INTC_0_BASEADDR, (unsigned long) intc);
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#else
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printk(KERN_INFO "Xilinx INTC #0 at 0x%08lX (DCR)\n",
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(unsigned long) XPAR_INTC_0_BASEADDR);
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#endif
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/*
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* Disable all external interrupts until they are
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* explicity requested.
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*/
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intc_out_be32(intc + IER, 0);
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/* Acknowledge any pending interrupts just in case. */
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intc_out_be32(intc + IAR, ~(u32) 0);
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/* Turn on the Master Enable. */
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intc_out_be32(intc + MER, 0x3UL);
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ppc_md.get_irq = xilinx_pic_get_irq;
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for (i = 0; i < NR_IRQS; ++i) {
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irq_desc[i].handler = &xilinx_intc;
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if (XPAR_INTC_0_KIND_OF_INTR & (0x00000001 << i))
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irq_desc[i].status &= ~IRQ_LEVEL;
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else
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irq_desc[i].status |= IRQ_LEVEL;
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}
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}
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