arch/m68k/platform/coldfire/intc-2.c

   1 /*
   2  * intc-2.c
   3  *
   4  * General interrupt controller code for the many ColdFire cores that use
   5  * interrupt controllers with 63 interrupt sources, organized as 56 fully-
   6  * programmable + 7 fixed-level interrupt sources. This includes the 523x
   7  * family, the 5270, 5271, 5274, 5275, and the 528x family which have two such
   8  * controllers, and the 547x and 548x families which have only one of them.
   9  *
  10  * The external 7 fixed interrupts are part the the Edge Port unit of these
  11  * ColdFire parts. They can be configured as level or edge triggered.
  12  *
  13  * (C) Copyright 2009-2011, Greg Ungerer <gerg@snapgear.com>
  14  *
  15  * This file is subject to the terms and conditions of the GNU General Public
  16  * License.  See the file COPYING in the main directory of this archive
  17  * for more details.
  18  */
  19
  20 #include <linux/types.h>
  21 #include <linux/init.h>
  22 #include <linux/kernel.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/irq.h>
  25 #include <linux/io.h>
  26 #include <asm/coldfire.h>
  27 #include <asm/mcfsim.h>
  28 #include <asm/traps.h>
  29
  30 /*
  31  * Bit definitions for the ICR family of registers.
  32  */
  33 #define MCFSIM_ICR_LEVEL(l)     ((l)<<3)        /* Level l intr */
  34 #define MCFSIM_ICR_PRI(p)       (p)             /* Priority p intr */
  35
  36 /*
  37  *      The EDGE Port interrupts are the fixed 7 external interrupts.
  38  *      They need some special treatment, for example they need to be acked.
  39  */
  40 #define EINT0   64      /* Is not actually used, but spot reserved for it */
  41 #define EINT1   65      /* EDGE Port interrupt 1 */
  42 #define EINT7   71      /* EDGE Port interrupt 7 */
  43
  44 #ifdef MCFICM_INTC1
  45 #define NR_VECS 128
  46 #else
  47 #define NR_VECS 64
  48 #endif
  49
  50 static void intc_irq_mask(struct irq_data *d)
  51 {
  52         unsigned int irq = d->irq - MCFINT_VECBASE;
  53         unsigned long imraddr;
  54         u32 val, imrbit;
  55
  56 #ifdef MCFICM_INTC1
  57         imraddr = (irq & 0x40) ? MCFICM_INTC1 : MCFICM_INTC0;
  58 #else
  59         imraddr = MCFICM_INTC0;
  60 #endif
  61         imraddr += (irq & 0x20) ? MCFINTC_IMRH : MCFINTC_IMRL;
  62         imrbit = 0x1 << (irq & 0x1f);
  63
  64         val = __raw_readl(imraddr);
  65         __raw_writel(val | imrbit, imraddr);
  66 }
  67
  68 static void intc_irq_unmask(struct irq_data *d)
  69 {
  70         unsigned int irq = d->irq - MCFINT_VECBASE;
  71         unsigned long imraddr;
  72         u32 val, imrbit;
  73
  74 #ifdef MCFICM_INTC1
  75         imraddr = (irq & 0x40) ? MCFICM_INTC1 : MCFICM_INTC0;
  76 #else
  77         imraddr = MCFICM_INTC0;
  78 #endif
  79         imraddr += ((irq & 0x20) ? MCFINTC_IMRH : MCFINTC_IMRL);
  80         imrbit = 0x1 << (irq & 0x1f);
  81
  82         /* Don't set the "maskall" bit! */
  83         if ((irq & 0x20) == 0)
  84                 imrbit |= 0x1;
  85
  86         val = __raw_readl(imraddr);
  87         __raw_writel(val & ~imrbit, imraddr);
  88 }
  89
  90 /*
  91  *      Only the external (or EDGE Port) interrupts need to be acknowledged
  92  *      here, as part of the IRQ handler. They only really need to be ack'ed
  93  *      if they are in edge triggered mode, but there is no harm in doing it
  94  *      for all types.
  95  */
  96 static void intc_irq_ack(struct irq_data *d)
  97 {
  98         unsigned int irq = d->irq;
  99
 100         __raw_writeb(0x1 << (irq - EINT0), MCFEPORT_EPFR);
 101 }
 102
 103 /*
 104  *      Each vector needs a unique priority and level associated with it.
 105  *      We don't really care so much what they are, we don't rely on the
 106  *      traditional priority interrupt scheme of the m68k/ColdFire. This
 107  *      only needs to be set once for an interrupt, and we will never change
 108  *      these values once we have set them.
 109  */
 110 static u8 intc_intpri = MCFSIM_ICR_LEVEL(6) | MCFSIM_ICR_PRI(6);
 111
 112 static unsigned int intc_irq_startup(struct irq_data *d)
 113 {
 114         unsigned int irq = d->irq - MCFINT_VECBASE;
 115         unsigned long icraddr;
 116
 117 #ifdef MCFICM_INTC1
 118         icraddr = (irq & 0x40) ? MCFICM_INTC1 : MCFICM_INTC0;
 119 #else
 120         icraddr = MCFICM_INTC0;
 121 #endif
 122         icraddr += MCFINTC_ICR0 + (irq & 0x3f);
 123         if (__raw_readb(icraddr) == 0)
 124                 __raw_writeb(intc_intpri--, icraddr);
 125
 126         irq = d->irq;
 127         if ((irq >= EINT1) && (irq <= EINT7)) {
 128                 u8 v;
 129
 130                 irq -= EINT0;
 131
 132                 /* Set EPORT line as input */
 133                 v = __raw_readb(MCFEPORT_EPDDR);
 134                 __raw_writeb(v & ~(0x1 << irq), MCFEPORT_EPDDR);
 135
 136                 /* Set EPORT line as interrupt source */
 137                 v = __raw_readb(MCFEPORT_EPIER);
 138                 __raw_writeb(v | (0x1 << irq), MCFEPORT_EPIER);
 139         }
 140
 141         intc_irq_unmask(d);
 142         return 0;
 143 }
 144
 145 static int intc_irq_set_type(struct irq_data *d, unsigned int type)
 146 {
 147         unsigned int irq = d->irq;
 148         u16 pa, tb;
 149
 150         switch (type) {
 151         case IRQ_TYPE_EDGE_RISING:
 152                 tb = 0x1;
 153                 break;
 154         case IRQ_TYPE_EDGE_FALLING:
 155                 tb = 0x2;
 156                 break;
 157         case IRQ_TYPE_EDGE_BOTH:
 158                 tb = 0x3;
 159                 break;
 160         default:
 161                 /* Level triggered */
 162                 tb = 0;
 163                 break;
 164         }
 165
 166         if (tb)
 167                 irq_set_handler(irq, handle_edge_irq);
 168
 169         irq -= EINT0;
 170         pa = __raw_readw(MCFEPORT_EPPAR);
 171         pa = (pa & ~(0x3 << (irq * 2))) | (tb << (irq * 2));
 172         __raw_writew(pa, MCFEPORT_EPPAR);
 173
 174         return 0;
 175 }
 176
 177 static struct irq_chip intc_irq_chip = {
 178         .name           = "CF-INTC",
 179         .irq_startup    = intc_irq_startup,
 180         .irq_mask       = intc_irq_mask,
 181         .irq_unmask     = intc_irq_unmask,
 182 };
 183
 184 static struct irq_chip intc_irq_chip_edge_port = {
 185         .name           = "CF-INTC-EP",
 186         .irq_startup    = intc_irq_startup,
 187         .irq_mask       = intc_irq_mask,
 188         .irq_unmask     = intc_irq_unmask,
 189         .irq_ack        = intc_irq_ack,
 190         .irq_set_type   = intc_irq_set_type,
 191 };
 192
 193 void __init init_IRQ(void)
 194 {
 195         int irq;
 196
 197         /* Mask all interrupt sources */
 198         __raw_writel(0x1, MCFICM_INTC0 + MCFINTC_IMRL);
 199 #ifdef MCFICM_INTC1
 200         __raw_writel(0x1, MCFICM_INTC1 + MCFINTC_IMRL);
 201 #endif
 202
 203         for (irq = MCFINT_VECBASE; (irq < MCFINT_VECBASE + NR_VECS); irq++) {
 204                 if ((irq >= EINT1) && (irq <=EINT7))
 205                         irq_set_chip(irq, &intc_irq_chip_edge_port);
 206                 else
 207                         irq_set_chip(irq, &intc_irq_chip);
 208                 irq_set_irq_type(irq, IRQ_TYPE_LEVEL_HIGH);
 209                 irq_set_handler(irq, handle_level_irq);
 210         }
 211 }
 212