drivers/parisc/gsc.c

   1 /*
   2  * Interrupt management for most GSC and related devices.
   3  *
   4  * (c) Copyright 1999 Alex deVries for The Puffin Group
   5  * (c) Copyright 1999 Grant Grundler for Hewlett-Packard
   6  * (c) Copyright 1999 Matthew Wilcox
   7  * (c) Copyright 2000 Helge Deller
   8  * (c) Copyright 2001 Matthew Wilcox for Hewlett-Packard
   9  *
  10  *      This program is free software; you can redistribute it and/or modify
  11  *      it under the terms of the GNU General Public License as published by
  12  *      the Free Software Foundation; either version 2 of the License, or
  13  *      (at your option) any later version.
  14  */
  15
  16 #include <linux/bitops.h>
  17 #include <linux/errno.h>
  18 #include <linux/init.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/ioport.h>
  21 #include <linux/module.h>
  22 #include <linux/types.h>
  23
  24 #include <asm/hardware.h>
  25 #include <asm/io.h>
  26
  27 #include "gsc.h"
  28
  29 #undef DEBUG
  30
  31 #ifdef DEBUG
  32 #define DEBPRINTK printk
  33 #else
  34 #define DEBPRINTK(x,...)
  35 #endif
  36
  37 int gsc_alloc_irq(struct gsc_irq *i)
  38 {
  39         int irq = txn_alloc_irq(GSC_EIM_WIDTH);
  40         if (irq < 0) {
  41                 printk("cannot get irq\n");
  42                 return irq;
  43         }
  44
  45         i->txn_addr = txn_alloc_addr(irq);
  46         i->txn_data = txn_alloc_data(irq);
  47         i->irq = irq;
  48
  49         return irq;
  50 }
  51
  52 int gsc_claim_irq(struct gsc_irq *i, int irq)
  53 {
  54         int c = irq;
  55
  56         irq += CPU_IRQ_BASE; /* virtualize the IRQ first */
  57
  58         irq = txn_claim_irq(irq);
  59         if (irq < 0) {
  60                 printk("cannot claim irq %d\n", c);
  61                 return irq;
  62         }
  63
  64         i->txn_addr = txn_alloc_addr(irq);
  65         i->txn_data = txn_alloc_data(irq);
  66         i->irq = irq;
  67
  68         return irq;
  69 }
  70
  71 EXPORT_SYMBOL(gsc_alloc_irq);
  72 EXPORT_SYMBOL(gsc_claim_irq);
  73
  74 /* Common interrupt demultiplexer used by Asp, Lasi & Wax.  */
  75 irqreturn_t gsc_asic_intr(int gsc_asic_irq, void *dev)
  76 {
  77         unsigned long irr;
  78         struct gsc_asic *gsc_asic = dev;
  79
  80         irr = gsc_readl(gsc_asic->hpa + OFFSET_IRR);
  81         if (irr == 0)
  82                 return IRQ_NONE;
  83
  84         DEBPRINTK("%s intr, mask=0x%x\n", gsc_asic->name, irr);
  85
  86         do {
  87                 int local_irq = __ffs(irr);
  88                 unsigned int irq = gsc_asic->global_irq[local_irq];
  89                 generic_handle_irq(irq);
  90                 irr &= ~(1 << local_irq);
  91         } while (irr);
  92
  93         return IRQ_HANDLED;
  94 }
  95
  96 int gsc_find_local_irq(unsigned int irq, int *global_irqs, int limit)
  97 {
  98         int local_irq;
  99
 100         for (local_irq = 0; local_irq < limit; local_irq++) {
 101                 if (global_irqs[local_irq] == irq)
 102                         return local_irq;
 103         }
 104
 105         return NO_IRQ;
 106 }
 107
 108 static void gsc_asic_mask_irq(unsigned int irq)
 109 {
 110         struct gsc_asic *irq_dev = get_irq_chip_data(irq);
 111         int local_irq = gsc_find_local_irq(irq, irq_dev->global_irq, 32);
 112         u32 imr;
 113
 114         DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, irq,
 115                         irq_dev->name, imr);
 116
 117         /* Disable the IRQ line by clearing the bit in the IMR */
 118         imr = gsc_readl(irq_dev->hpa + OFFSET_IMR);
 119         imr &= ~(1 << local_irq);
 120         gsc_writel(imr, irq_dev->hpa + OFFSET_IMR);
 121 }
 122
 123 static void gsc_asic_unmask_irq(unsigned int irq)
 124 {
 125         struct gsc_asic *irq_dev = get_irq_chip_data(irq);
 126         int local_irq = gsc_find_local_irq(irq, irq_dev->global_irq, 32);
 127         u32 imr;
 128
 129         DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, irq,
 130                         irq_dev->name, imr);
 131
 132         /* Enable the IRQ line by setting the bit in the IMR */
 133         imr = gsc_readl(irq_dev->hpa + OFFSET_IMR);
 134         imr |= 1 << local_irq;
 135         gsc_writel(imr, irq_dev->hpa + OFFSET_IMR);
 136         /*
 137          * FIXME: read IPR to make sure the IRQ isn't already pending.
 138          *   If so, we need to read IRR and manually call do_irq().
 139          */
 140 }
 141
 142 static struct irq_chip gsc_asic_interrupt_type = {
 143         .name   =       "GSC-ASIC",
 144         .unmask =       gsc_asic_unmask_irq,
 145         .mask   =       gsc_asic_mask_irq,
 146 };
 147
 148 int gsc_assign_irq(struct irq_chip *type, void *data)
 149 {
 150         static int irq = GSC_IRQ_BASE;
 151
 152         if (irq > GSC_IRQ_MAX)
 153                 return NO_IRQ;
 154
 155         set_irq_chip_and_handler(irq, type, handle_simple_irq);
 156         set_irq_chip_data(irq, data);
 157
 158         return irq++;
 159 }
 160
 161 void gsc_asic_assign_irq(struct gsc_asic *asic, int local_irq, int *irqp)
 162 {
 163         int irq = asic->global_irq[local_irq];
 164
 165         if (irq <= 0) {
 166                 irq = gsc_assign_irq(&gsc_asic_interrupt_type, asic);
 167                 if (irq == NO_IRQ)
 168                         return;
 169
 170                 asic->global_irq[local_irq] = irq;
 171         }
 172         *irqp = irq;
 173 }
 174
 175 struct gsc_fixup_struct {
 176         void (*choose_irq)(struct parisc_device *, void *);
 177         void *ctrl;
 178 };
 179
 180 static int gsc_fixup_irqs_callback(struct device *dev, void *data)
 181 {
 182         struct parisc_device *padev = to_parisc_device(dev);
 183         struct gsc_fixup_struct *gf = data;
 184
 185         /* work-around for 715/64 and others which have parent
 186            at path [5] and children at path [5/0/x] */
 187         if (padev->id.hw_type == HPHW_FAULTY)
 188                 gsc_fixup_irqs(padev, gf->ctrl, gf->choose_irq);
 189         gf->choose_irq(padev, gf->ctrl);
 190
 191         return 0;
 192 }
 193
 194 void gsc_fixup_irqs(struct parisc_device *parent, void *ctrl,
 195                         void (*choose_irq)(struct parisc_device *, void *))
 196 {
 197         struct gsc_fixup_struct data = {
 198                 .choose_irq     = choose_irq,
 199                 .ctrl           = ctrl,
 200         };
 201
 202         device_for_each_child(&parent->dev, &data, gsc_fixup_irqs_callback);
 203 }
 204
 205 int gsc_common_setup(struct parisc_device *parent, struct gsc_asic *gsc_asic)
 206 {
 207         struct resource *res;
 208         int i;
 209
 210         gsc_asic->gsc = parent;
 211
 212         /* Initialise local irq -> global irq mapping */
 213         for (i = 0; i < 32; i++) {
 214                 gsc_asic->global_irq[i] = NO_IRQ;
 215         }
 216
 217         /* allocate resource region */
 218         res = request_mem_region(gsc_asic->hpa, 0x100000, gsc_asic->name);
 219         if (res) {
 220                 res->flags = IORESOURCE_MEM;    /* do not mark it busy ! */
 221         }
 222
 223 #if 0
 224         printk(KERN_WARNING "%s IRQ %d EIM 0x%x", gsc_asic->name,
 225                         parent->irq, gsc_asic->eim);
 226         if (gsc_readl(gsc_asic->hpa + OFFSET_IMR))
 227                 printk("  IMR is non-zero! (0x%x)",
 228                                 gsc_readl(gsc_asic->hpa + OFFSET_IMR));
 229         printk("\n");
 230 #endif
 231
 232         return 0;
 233 }
 234
 235 extern struct parisc_driver lasi_driver;
 236 extern struct parisc_driver asp_driver;
 237 extern struct parisc_driver wax_driver;
 238
 239 void __init gsc_init(void)
 240 {
 241 #ifdef CONFIG_GSC_LASI
 242         register_parisc_driver(&lasi_driver);
 243         register_parisc_driver(&asp_driver);
 244 #endif
 245 #ifdef CONFIG_GSC_WAX
 246         register_parisc_driver(&wax_driver);
 247 #endif
 248 }