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 __do_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_disable_irq(unsigned int irq) 109 { 110 struct irq_desc *desc = irq_to_desc(irq); 111 struct gsc_asic *irq_dev = desc->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", __func__, 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 } 123 124 static void gsc_asic_enable_irq(unsigned int irq) 125 { 126 struct irq_desc *desc = irq_to_desc(irq); 127 struct gsc_asic *irq_dev = desc->chip_data; 128 int local_irq = gsc_find_local_irq(irq, irq_dev->global_irq, 32); 129 u32 imr; 130 131 DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, irq, 132 irq_dev->name, imr); 133 134 /* Enable the IRQ line by setting the bit in the IMR */ 135 imr = gsc_readl(irq_dev->hpa + OFFSET_IMR); 136 imr |= 1 << local_irq; 137 gsc_writel(imr, irq_dev->hpa + OFFSET_IMR); 138 /* 139 * FIXME: read IPR to make sure the IRQ isn't already pending. 140 * If so, we need to read IRR and manually call do_irq(). 141 */ 142 } 143 144 static unsigned int gsc_asic_startup_irq(unsigned int irq) 145 { 146 gsc_asic_enable_irq(irq); 147 return 0; 148 } 149 150 static struct irq_chip gsc_asic_interrupt_type = { 151 .name = "GSC-ASIC", 152 .startup = gsc_asic_startup_irq, 153 .shutdown = gsc_asic_disable_irq, 154 .enable = gsc_asic_enable_irq, 155 .disable = gsc_asic_disable_irq, 156 .ack = no_ack_irq, 157 .end = no_end_irq, 158 }; 159 160 int gsc_assign_irq(struct irq_chip *type, void *data) 161 { 162 static int irq = GSC_IRQ_BASE; 163 struct irq_desc *desc; 164 165 if (irq > GSC_IRQ_MAX) 166 return NO_IRQ; 167 168 desc = irq_to_desc(irq); 169 desc->chip = type; 170 desc->chip_data = data; 171 return irq++; 172 } 173 174 void gsc_asic_assign_irq(struct gsc_asic *asic, int local_irq, int *irqp) 175 { 176 int irq = asic->global_irq[local_irq]; 177 178 if (irq <= 0) { 179 irq = gsc_assign_irq(&gsc_asic_interrupt_type, asic); 180 if (irq == NO_IRQ) 181 return; 182 183 asic->global_irq[local_irq] = irq; 184 } 185 *irqp = irq; 186 } 187 188 struct gsc_fixup_struct { 189 void (*choose_irq)(struct parisc_device *, void *); 190 void *ctrl; 191 }; 192 193 static int gsc_fixup_irqs_callback(struct device *dev, void *data) 194 { 195 struct parisc_device *padev = to_parisc_device(dev); 196 struct gsc_fixup_struct *gf = data; 197 198 /* work-around for 715/64 and others which have parent 199 at path [5] and children at path [5/0/x] */ 200 if (padev->id.hw_type == HPHW_FAULTY) 201 gsc_fixup_irqs(padev, gf->ctrl, gf->choose_irq); 202 gf->choose_irq(padev, gf->ctrl); 203 204 return 0; 205 } 206 207 void gsc_fixup_irqs(struct parisc_device *parent, void *ctrl, 208 void (*choose_irq)(struct parisc_device *, void *)) 209 { 210 struct gsc_fixup_struct data = { 211 .choose_irq = choose_irq, 212 .ctrl = ctrl, 213 }; 214 215 device_for_each_child(&parent->dev, &data, gsc_fixup_irqs_callback); 216 } 217 218 int gsc_common_setup(struct parisc_device *parent, struct gsc_asic *gsc_asic) 219 { 220 struct resource *res; 221 int i; 222 223 gsc_asic->gsc = parent; 224 225 /* Initialise local irq -> global irq mapping */ 226 for (i = 0; i < 32; i++) { 227 gsc_asic->global_irq[i] = NO_IRQ; 228 } 229 230 /* allocate resource region */ 231 res = request_mem_region(gsc_asic->hpa, 0x100000, gsc_asic->name); 232 if (res) { 233 res->flags = IORESOURCE_MEM; /* do not mark it busy ! */ 234 } 235 236 #if 0 237 printk(KERN_WARNING "%s IRQ %d EIM 0x%x", gsc_asic->name, 238 parent->irq, gsc_asic->eim); 239 if (gsc_readl(gsc_asic->hpa + OFFSET_IMR)) 240 printk(" IMR is non-zero! (0x%x)", 241 gsc_readl(gsc_asic->hpa + OFFSET_IMR)); 242 printk("\n"); 243 #endif 244 245 return 0; 246 } 247 248 extern struct parisc_driver lasi_driver; 249 extern struct parisc_driver asp_driver; 250 extern struct parisc_driver wax_driver; 251 252 void __init gsc_init(void) 253 { 254 #ifdef CONFIG_GSC_LASI 255 register_parisc_driver(&lasi_driver); 256 register_parisc_driver(&asp_driver); 257 #endif 258 #ifdef CONFIG_GSC_WAX 259 register_parisc_driver(&wax_driver); 260 #endif 261 } 262