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 38 int 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 53 int 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 72 EXPORT_SYMBOL(gsc_alloc_irq); 73 EXPORT_SYMBOL(gsc_claim_irq); 74 75 /* Common interrupt demultiplexer used by Asp, Lasi & Wax. */ 76 irqreturn_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 97 int 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 } 108 109 static void gsc_asic_disable_irq(unsigned int irq) 110 { 111 struct irq_desc *desc = irq_to_desc(irq); 112 struct gsc_asic *irq_dev = desc->chip_data; 113 int local_irq = gsc_find_local_irq(irq, irq_dev->global_irq, 32); 114 u32 imr; 115 116 DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, irq, 117 irq_dev->name, imr); 118 119 /* Disable the IRQ line by clearing the bit in the IMR */ 120 imr = gsc_readl(irq_dev->hpa + OFFSET_IMR); 121 imr &= ~(1 << local_irq); 122 gsc_writel(imr, irq_dev->hpa + OFFSET_IMR); 123 } 124 125 static void gsc_asic_enable_irq(unsigned int irq) 126 { 127 struct irq_desc *desc = irq_to_desc(irq); 128 struct gsc_asic *irq_dev = desc->chip_data; 129 int local_irq = gsc_find_local_irq(irq, irq_dev->global_irq, 32); 130 u32 imr; 131 132 DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, irq, 133 irq_dev->name, imr); 134 135 /* Enable the IRQ line by setting the bit in the IMR */ 136 imr = gsc_readl(irq_dev->hpa + OFFSET_IMR); 137 imr |= 1 << local_irq; 138 gsc_writel(imr, irq_dev->hpa + OFFSET_IMR); 139 /* 140 * FIXME: read IPR to make sure the IRQ isn't already pending. 141 * If so, we need to read IRR and manually call do_irq(). 142 */ 143 } 144 145 static unsigned int gsc_asic_startup_irq(unsigned int irq) 146 { 147 gsc_asic_enable_irq(irq); 148 return 0; 149 } 150 151 static struct hw_interrupt_type gsc_asic_interrupt_type = { 152 .typename = "GSC-ASIC", 153 .startup = gsc_asic_startup_irq, 154 .shutdown = gsc_asic_disable_irq, 155 .enable = gsc_asic_enable_irq, 156 .disable = gsc_asic_disable_irq, 157 .ack = no_ack_irq, 158 .end = no_end_irq, 159 }; 160 161 int gsc_assign_irq(struct hw_interrupt_type *type, void *data) 162 { 163 static int irq = GSC_IRQ_BASE; 164 struct irq_desc *desc; 165 166 if (irq > GSC_IRQ_MAX) 167 return NO_IRQ; 168 169 desc = irq_to_desc(irq); 170 desc->chip = type; 171 desc->chip_data = data; 172 return irq++; 173 } 174 175 void gsc_asic_assign_irq(struct gsc_asic *asic, int local_irq, int *irqp) 176 { 177 int irq = asic->global_irq[local_irq]; 178 179 if (irq <= 0) { 180 irq = gsc_assign_irq(&gsc_asic_interrupt_type, asic); 181 if (irq == NO_IRQ) 182 return; 183 184 asic->global_irq[local_irq] = irq; 185 } 186 *irqp = irq; 187 } 188 189 static struct device *next_device(struct klist_iter *i) 190 { 191 struct klist_node * n = klist_next(i); 192 return n ? container_of(n, struct device, knode_parent) : NULL; 193 } 194 195 void gsc_fixup_irqs(struct parisc_device *parent, void *ctrl, 196 void (*choose_irq)(struct parisc_device *, void *)) 197 { 198 struct device *dev; 199 struct klist_iter i; 200 201 klist_iter_init(&parent->dev.klist_children, &i); 202 while ((dev = next_device(&i))) { 203 struct parisc_device *padev = to_parisc_device(dev); 204 205 /* work-around for 715/64 and others which have parent 206 at path [5] and children at path [5/0/x] */ 207 if (padev->id.hw_type == HPHW_FAULTY) 208 return gsc_fixup_irqs(padev, ctrl, choose_irq); 209 choose_irq(padev, ctrl); 210 } 211 klist_iter_exit(&i); 212 } 213 214 int gsc_common_setup(struct parisc_device *parent, struct gsc_asic *gsc_asic) 215 { 216 struct resource *res; 217 int i; 218 219 gsc_asic->gsc = parent; 220 221 /* Initialise local irq -> global irq mapping */ 222 for (i = 0; i < 32; i++) { 223 gsc_asic->global_irq[i] = NO_IRQ; 224 } 225 226 /* allocate resource region */ 227 res = request_mem_region(gsc_asic->hpa, 0x100000, gsc_asic->name); 228 if (res) { 229 res->flags = IORESOURCE_MEM; /* do not mark it busy ! */ 230 } 231 232 #if 0 233 printk(KERN_WARNING "%s IRQ %d EIM 0x%x", gsc_asic->name, 234 parent->irq, gsc_asic->eim); 235 if (gsc_readl(gsc_asic->hpa + OFFSET_IMR)) 236 printk(" IMR is non-zero! (0x%x)", 237 gsc_readl(gsc_asic->hpa + OFFSET_IMR)); 238 printk("\n"); 239 #endif 240 241 return 0; 242 } 243 244 extern struct parisc_driver lasi_driver; 245 extern struct parisc_driver asp_driver; 246 extern struct parisc_driver wax_driver; 247 248 void __init gsc_init(void) 249 { 250 #ifdef CONFIG_GSC_LASI 251 register_parisc_driver(&lasi_driver); 252 register_parisc_driver(&asp_driver); 253 #endif 254 #ifdef CONFIG_GSC_WAX 255 register_parisc_driver(&wax_driver); 256 #endif 257 } 258