arch/powerpc/cpu/ppc4xx/xilinx_irq.c

   1 /*
   2  * (C) Copyright 2008
   3  * Ricado Ribalda-Universidad Autonoma de Madrid-ricardo.ribalda@uam.es
   4  * This work has been supported by: QTechnology  http://qtec.com/
   5  * Based on interrupts.c Wolfgang Denk-DENX Software Engineering-wd@denx.de
   6  * SPDX-License-Identifier:     GPL-2.0+
   7 */
   8 #include <common.h>
   9 #include <watchdog.h>
  10 #include <command.h>
  11 #include <asm/processor.h>
  12 #include <asm/interrupt.h>
  13 #include <asm/ppc4xx.h>
  14 #include <ppc_asm.tmpl>
  15 #include <commproc.h>
  16 #include <asm/io.h>
  17 #include <asm/xilinx_irq.h>
  18
  19 DECLARE_GLOBAL_DATA_PTR;
  20
  21 void pic_enable(void)
  22 {
  23         debug("Xilinx PIC at 0x%8x\n", intc);
  24
  25         /*
  26          * Disable all external interrupts until they are
  27          * explicitly requested.
  28          */
  29         out_be32((u32 *) IER, 0);
  30
  31         /* Acknowledge any pending interrupts just in case. */
  32         out_be32((u32 *) IAR, 0xffffffff);
  33
  34         /* Turn on the Master Enable. */
  35         out_be32((u32 *) MER, 0x3UL);
  36
  37         return;
  38 }
  39
  40 int xilinx_pic_irq_get(void)
  41 {
  42         u32 irq;
  43         irq = in_be32((u32 *) IVR);
  44
  45         /* If no interrupt is pending then all bits of the IVR are set to 1. As
  46          * the IVR is as many bits wide as numbers of inputs are available.
  47          * Therefore, if all bits of the IVR are set to one, its content will
  48          * be bigger than XPAR_INTC_MAX_NUM_INTR_INPUTS.
  49          */
  50         if (irq >= XPAR_INTC_MAX_NUM_INTR_INPUTS)
  51                 irq = -1;       /* report no pending interrupt. */
  52
  53         debug("get_irq: %d\n", irq);
  54         return (irq);
  55 }
  56
  57 void pic_irq_enable(unsigned int irq)
  58 {
  59         u32 mask = IRQ_MASK(irq);
  60         debug("enable: %d\n", irq);
  61         out_be32((u32 *) SIE, mask);
  62 }
  63
  64 void pic_irq_disable(unsigned int irq)
  65 {
  66         u32 mask = IRQ_MASK(irq);
  67         debug("disable: %d\n", irq);
  68         out_be32((u32 *) CIE, mask);
  69 }
  70
  71 void pic_irq_ack(unsigned int irq)
  72 {
  73         u32 mask = IRQ_MASK(irq);
  74         debug("ack: %d\n", irq);
  75         out_be32((u32 *) IAR, mask);
  76 }
  77
  78 void external_interrupt(struct pt_regs *regs)
  79 {
  80         int irq;
  81
  82         irq = xilinx_pic_irq_get();
  83         if (irq < 0)
  84                 return;
  85
  86         interrupt_run_handler(irq);
  87
  88         return;
  89 }