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 irq_chip gsc_asic_interrupt_type = { 152 .name = "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 irq_chip *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 struct gsc_fixup_struct { 190 void (*choose_irq)(struct parisc_device *, void *); 191 void *ctrl; 192 }; 193 194 static int gsc_fixup_irqs_callback(struct device *dev, void *data) 195 { 196 struct parisc_device *padev = to_parisc_device(dev); 197 struct gsc_fixup_struct *gf = data; 198 199 /* work-around for 715/64 and others which have parent 200 at path [5] and children at path [5/0/x] */ 201 if (padev->id.hw_type == HPHW_FAULTY) 202 gsc_fixup_irqs(padev, gf->ctrl, gf->choose_irq); 203 gf->choose_irq(padev, gf->ctrl); 204 205 return 0; 206 } 207 208 void gsc_fixup_irqs(struct parisc_device *parent, void *ctrl, 209 void (*choose_irq)(struct parisc_device *, void *)) 210 { 211 struct gsc_fixup_struct data = { 212 .choose_irq = choose_irq, 213 .ctrl = ctrl, 214 }; 215 216 device_for_each_child(&parent->dev, &data, gsc_fixup_irqs_callback); 217 } 218 219 int gsc_common_setup(struct parisc_device *parent, struct gsc_asic *gsc_asic) 220 { 221 struct resource *res; 222 int i; 223 224 gsc_asic->gsc = parent; 225 226 /* Initialise local irq -> global irq mapping */ 227 for (i = 0; i < 32; i++) { 228 gsc_asic->global_irq[i] = NO_IRQ; 229 } 230 231 /* allocate resource region */ 232 res = request_mem_region(gsc_asic->hpa, 0x100000, gsc_asic->name); 233 if (res) { 234 res->flags = IORESOURCE_MEM; /* do not mark it busy ! */ 235 } 236 237 #if 0 238 printk(KERN_WARNING "%s IRQ %d EIM 0x%x", gsc_asic->name, 239 parent->irq, gsc_asic->eim); 240 if (gsc_readl(gsc_asic->hpa + OFFSET_IMR)) 241 printk(" IMR is non-zero! (0x%x)", 242 gsc_readl(gsc_asic->hpa + OFFSET_IMR)); 243 printk("\n"); 244 #endif 245 246 return 0; 247 } 248 249 extern struct parisc_driver lasi_driver; 250 extern struct parisc_driver asp_driver; 251 extern struct parisc_driver wax_driver; 252 253 void __init gsc_init(void) 254 { 255 #ifdef CONFIG_GSC_LASI 256 register_parisc_driver(&lasi_driver); 257 register_parisc_driver(&asp_driver); 258 #endif 259 #ifdef CONFIG_GSC_WAX 260 register_parisc_driver(&wax_driver); 261 #endif 262 } 263