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/slab.h> 23#include <linux/types.h> 24 25#include <asm/hardware.h> 26#include <asm/io.h> 27 28#include "gsc.h" 29 30#undef DEBUG 31 32#ifdef DEBUG 33#define DEBPRINTK printk 34#else 35#define DEBPRINTK(x,...) 36#endif 37 38int gsc_alloc_irq(struct gsc_irq *i) 39{ 40 int irq = txn_alloc_irq(GSC_EIM_WIDTH); 41 if (irq < 0) { 42 printk("cannot get irq\n"); 43 return irq; 44 } 45 46 i->txn_addr = txn_alloc_addr(irq); 47 i->txn_data = txn_alloc_data(irq); 48 i->irq = irq; 49 50 return irq; 51} 52 53int gsc_claim_irq(struct gsc_irq *i, int irq) 54{ 55 int c = irq; 56 57 irq += CPU_IRQ_BASE; /* virtualize the IRQ first */ 58 59 irq = txn_claim_irq(irq); 60 if (irq < 0) { 61 printk("cannot claim irq %d\n", c); 62 return irq; 63 } 64 65 i->txn_addr = txn_alloc_addr(irq); 66 i->txn_data = txn_alloc_data(irq); 67 i->irq = irq; 68 69 return irq; 70} 71 72EXPORT_SYMBOL(gsc_alloc_irq); 73EXPORT_SYMBOL(gsc_claim_irq); 74 75/* Common interrupt demultiplexer used by Asp, Lasi & Wax. */ 76irqreturn_t gsc_asic_intr(int gsc_asic_irq, void *dev) 77{ 78 unsigned long irr; 79 struct gsc_asic *gsc_asic = dev; 80 81 irr = gsc_readl(gsc_asic->hpa + OFFSET_IRR); 82 if (irr == 0) 83 return IRQ_NONE; 84 85 DEBPRINTK("%s intr, mask=0x%x\n", gsc_asic->name, irr); 86 87 do { 88 int local_irq = __ffs(irr); 89 unsigned int irq = gsc_asic->global_irq[local_irq]; 90 __do_IRQ(irq); 91 irr &= ~(1 << local_irq); 92 } while (irr); 93 94 return IRQ_HANDLED; 95} 96 97int gsc_find_local_irq(unsigned int irq, int *global_irqs, int limit) 98{ 99 int local_irq; 100 101 for (local_irq = 0; local_irq < limit; local_irq++) { 102 if (global_irqs[local_irq] == irq) 103 return local_irq; 104 } 105 106 return NO_IRQ; 107} 108 109static void gsc_asic_disable_irq(unsigned int irq) 110{ 111 struct gsc_asic *irq_dev = irq_desc[irq].chip_data; 112 int local_irq = gsc_find_local_irq(irq, irq_dev->global_irq, 32); 113 u32 imr; 114 115 DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __FUNCTION__, irq, 116 irq_dev->name, imr); 117 118 /* Disable the IRQ line by clearing the bit in the IMR */ 119 imr = gsc_readl(irq_dev->hpa + OFFSET_IMR); 120 imr &= ~(1 << local_irq); 121 gsc_writel(imr, irq_dev->hpa + OFFSET_IMR); 122} 123 124static void gsc_asic_enable_irq(unsigned int irq) 125{ 126 struct gsc_asic *irq_dev = irq_desc[irq].chip_data; 127 int local_irq = gsc_find_local_irq(irq, irq_dev->global_irq, 32); 128 u32 imr; 129 130 DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __FUNCTION__, irq, 131 irq_dev->name, imr); 132 133 /* Enable the IRQ line by setting the bit in the IMR */ 134 imr = gsc_readl(irq_dev->hpa + OFFSET_IMR); 135 imr |= 1 << local_irq; 136 gsc_writel(imr, irq_dev->hpa + OFFSET_IMR); 137} 138 139static unsigned int gsc_asic_startup_irq(unsigned int irq) 140{ 141 gsc_asic_enable_irq(irq); 142 return 0; 143} 144 145static struct hw_interrupt_type gsc_asic_interrupt_type = { 146 .typename = "GSC-ASIC", 147 .startup = gsc_asic_startup_irq, 148 .shutdown = gsc_asic_disable_irq, 149 .enable = gsc_asic_enable_irq, 150 .disable = gsc_asic_disable_irq, 151 .ack = no_ack_irq, 152 .end = no_end_irq, 153}; 154 155int gsc_assign_irq(struct hw_interrupt_type *type, void *data) 156{ 157 static int irq = GSC_IRQ_BASE; 158 159 if (irq > GSC_IRQ_MAX) 160 return NO_IRQ; 161 162 irq_desc[irq].chip = type; 163 irq_desc[irq].chip_data = data; 164 return irq++; 165} 166 167void gsc_asic_assign_irq(struct gsc_asic *asic, int local_irq, int *irqp) 168{ 169 int irq = asic->global_irq[local_irq]; 170 171 if (irq <= 0) { 172 irq = gsc_assign_irq(&gsc_asic_interrupt_type, asic); 173 if (irq == NO_IRQ) 174 return; 175 176 asic->global_irq[local_irq] = irq; 177 } 178 *irqp = irq; 179} 180 181static struct device *next_device(struct klist_iter *i) 182{ 183 struct klist_node * n = klist_next(i); 184 return n ? container_of(n, struct device, knode_parent) : NULL; 185} 186 187void gsc_fixup_irqs(struct parisc_device *parent, void *ctrl, 188 void (*choose_irq)(struct parisc_device *, void *)) 189{ 190 struct device *dev; 191 struct klist_iter i; 192 193 klist_iter_init(&parent->dev.klist_children, &i); 194 while ((dev = next_device(&i))) { 195 struct parisc_device *padev = to_parisc_device(dev); 196 197 if (padev->id.hw_type == HPHW_FAULTY) 198 return gsc_fixup_irqs(padev, ctrl, choose_irq); 199 choose_irq(padev, ctrl); 200 } 201 klist_iter_exit(&i); 202} 203 204int gsc_common_setup(struct parisc_device *parent, struct gsc_asic *gsc_asic) 205{ 206 struct resource *res; 207 int i; 208 209 gsc_asic->gsc = parent; 210 211 /* Initialise local irq -> global irq mapping */ 212 for (i = 0; i < 32; i++) { 213 gsc_asic->global_irq[i] = NO_IRQ; 214 } 215 216 /* allocate resource region */ 217 res = request_mem_region(gsc_asic->hpa, 0x100000, gsc_asic->name); 218 if (res) { 219 res->flags = IORESOURCE_MEM; /* do not mark it busy ! */ 220 } 221 222 223 return 0; 224} 225 226extern struct parisc_driver lasi_driver; 227extern struct parisc_driver asp_driver; 228extern struct parisc_driver wax_driver; 229 230void __init gsc_init(void) 231{ 232#ifdef CONFIG_GSC_LASI 233 register_parisc_driver(&lasi_driver); 234 register_parisc_driver(&asp_driver); 235#endif 236#ifdef CONFIG_GSC_WAX 237 register_parisc_driver(&wax_driver); 238#endif 239} 240