arch/mips/pmc-sierra/msp71xx/msp_irq.c

   1 /*
   2  * IRQ vector handles
   3  *
   4  * Copyright (C) 1995, 1996, 1997, 2003 by Ralf Baechle
   5  *
   6  * This file is subject to the terms and conditions of the GNU General Public
   7  * License.  See the file "COPYING" in the main directory of this archive
   8  * for more details.
   9  */
  10
  11 #include <linux/kernel.h>
  12 #include <linux/init.h>
  13 #include <linux/irq.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/ptrace.h>
  16 #include <linux/time.h>
  17
  18 #include <asm/irq_cpu.h>
  19
  20 #include <msp_int.h>
  21
  22 /* SLP bases systems */
  23 extern void msp_slp_irq_init(void);
  24 extern void msp_slp_irq_dispatch(void);
  25
  26 /* CIC based systems */
  27 extern void msp_cic_irq_init(void);
  28 extern void msp_cic_irq_dispatch(void);
  29
  30 /* VSMP support init */
  31 extern void msp_vsmp_int_init(void);
  32
  33 /* vectored interrupt implementation */
  34
  35 /* SW0/1 interrupts are used for SMP/SMTC */
  36 static inline void mac0_int_dispatch(void) { do_IRQ(MSP_INT_MAC0); }
  37 static inline void mac1_int_dispatch(void) { do_IRQ(MSP_INT_MAC1); }
  38 static inline void mac2_int_dispatch(void) { do_IRQ(MSP_INT_SAR); }
  39 static inline void usb_int_dispatch(void)  { do_IRQ(MSP_INT_USB);  }
  40 static inline void sec_int_dispatch(void)  { do_IRQ(MSP_INT_SEC);  }
  41
  42 /*
  43  * The PMC-Sierra MSP interrupts are arranged in a 3 level cascaded
  44  * hierarchical system.  The first level are the direct MIPS interrupts
  45  * and are assigned the interrupt range 0-7.  The second level is the SLM
  46  * interrupt controller and is assigned the range 8-39.  The third level
  47  * comprises the Peripherial block, the PCI block, the PCI MSI block and
  48  * the SLP.  The PCI interrupts and the SLP errors are handled by the
  49  * relevant subsystems so the core interrupt code needs only concern
  50  * itself with the Peripheral block.  These are assigned interrupts in
  51  * the range 40-71.
  52  */
  53
  54 asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
  55 {
  56         u32 pending;
  57
  58         pending = read_c0_status() & read_c0_cause();
  59
  60         /*
  61          * jump to the correct interrupt routine
  62          * These are arranged in priority order and the timer
  63          * comes first!
  64          */
  65
  66 #ifdef CONFIG_IRQ_MSP_CIC       /* break out the CIC stuff for now */
  67         if (pending & C_IRQ4)   /* do the peripherals first, that's the timer */
  68                 msp_cic_irq_dispatch();
  69
  70         else if (pending & C_IRQ0)
  71                 do_IRQ(MSP_INT_MAC0);
  72
  73         else if (pending & C_IRQ1)
  74                 do_IRQ(MSP_INT_MAC1);
  75
  76         else if (pending & C_IRQ2)
  77                 do_IRQ(MSP_INT_USB);
  78
  79         else if (pending & C_IRQ3)
  80                 do_IRQ(MSP_INT_SAR);
  81
  82         else if (pending & C_IRQ5)
  83                 do_IRQ(MSP_INT_SEC);
  84
  85 #else
  86         if (pending & C_IRQ5)
  87                 do_IRQ(MSP_INT_TIMER);
  88
  89         else if (pending & C_IRQ0)
  90                 do_IRQ(MSP_INT_MAC0);
  91
  92         else if (pending & C_IRQ1)
  93                 do_IRQ(MSP_INT_MAC1);
  94
  95         else if (pending & C_IRQ3)
  96                 do_IRQ(MSP_INT_VE);
  97
  98         else if (pending & C_IRQ4)
  99                 msp_slp_irq_dispatch();
 100 #endif
 101
 102         else if (pending & C_SW0)       /* do software after hardware */
 103                 do_IRQ(MSP_INT_SW0);
 104
 105         else if (pending & C_SW1)
 106                 do_IRQ(MSP_INT_SW1);
 107 }
 108
 109 static struct irqaction cic_cascade_msp = {
 110         .handler = no_action,
 111         .name    = "MSP CIC cascade",
 112         .flags   = IRQF_NO_THREAD,
 113 };
 114
 115 static struct irqaction per_cascade_msp = {
 116         .handler = no_action,
 117         .name    = "MSP PER cascade",
 118         .flags   = IRQF_NO_THREAD,
 119 };
 120
 121 void __init arch_init_irq(void)
 122 {
 123         /* assume we'll be using vectored interrupt mode except in UP mode*/
 124 #ifdef CONFIG_MIPS_MT
 125         BUG_ON(!cpu_has_vint);
 126 #endif
 127         /* initialize the 1st-level CPU based interrupt controller */
 128         mips_cpu_irq_init();
 129
 130 #ifdef CONFIG_IRQ_MSP_CIC
 131         msp_cic_irq_init();
 132 #ifdef CONFIG_MIPS_MT
 133         set_vi_handler(MSP_INT_CIC, msp_cic_irq_dispatch);
 134         set_vi_handler(MSP_INT_MAC0, mac0_int_dispatch);
 135         set_vi_handler(MSP_INT_MAC1, mac1_int_dispatch);
 136         set_vi_handler(MSP_INT_SAR, mac2_int_dispatch);
 137         set_vi_handler(MSP_INT_USB, usb_int_dispatch);
 138         set_vi_handler(MSP_INT_SEC, sec_int_dispatch);
 139 #ifdef CONFIG_MIPS_MT_SMP
 140         msp_vsmp_int_init();
 141 #elif defined CONFIG_MIPS_MT_SMTC
 142         /*Set hwmask for all platform devices */
 143         irq_hwmask[MSP_INT_MAC0] = C_IRQ0;
 144         irq_hwmask[MSP_INT_MAC1] = C_IRQ1;
 145         irq_hwmask[MSP_INT_USB] = C_IRQ2;
 146         irq_hwmask[MSP_INT_SAR] = C_IRQ3;
 147         irq_hwmask[MSP_INT_SEC] = C_IRQ5;
 148
 149 #endif  /* CONFIG_MIPS_MT_SMP */
 150 #endif  /* CONFIG_MIPS_MT */
 151         /* setup the cascaded interrupts */
 152         setup_irq(MSP_INT_CIC, &cic_cascade_msp);
 153         setup_irq(MSP_INT_PER, &per_cascade_msp);
 154
 155 #else
 156         /* setup the 2nd-level SLP register based interrupt controller */
 157         /* VSMP /SMTC support support is not enabled for SLP */
 158         msp_slp_irq_init();
 159
 160         /* setup the cascaded SLP/PER interrupts */
 161         setup_irq(MSP_INT_SLP, &cic_cascade_msp);
 162         setup_irq(MSP_INT_PER, &per_cascade_msp);
 163 #endif
 164 }