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/config.h> 18 #include <linux/errno.h> 19 #include <linux/init.h> 20 #include <linux/interrupt.h> 21 #include <linux/ioport.h> 22 #include <linux/module.h> 23 #include <linux/slab.h> 24 #include <linux/types.h> 25 26 #include <asm/hardware.h> 27 #include <asm/io.h> 28 29 #include "gsc.h" 30 31 #undef DEBUG 32 33 #ifdef DEBUG 34 #define DEBPRINTK printk 35 #else 36 #define DEBPRINTK(x,...) 37 #endif 38 39 int gsc_alloc_irq(struct gsc_irq *i) 40 { 41 int irq = txn_alloc_irq(GSC_EIM_WIDTH); 42 if (irq < 0) { 43 printk("cannot get irq\n"); 44 return irq; 45 } 46 47 i->txn_addr = txn_alloc_addr(irq); 48 i->txn_data = txn_alloc_data(irq); 49 i->irq = irq; 50 51 return irq; 52 } 53 54 int gsc_claim_irq(struct gsc_irq *i, int irq) 55 { 56 int c = irq; 57 58 irq += CPU_IRQ_BASE; /* virtualize the IRQ first */ 59 60 irq = txn_claim_irq(irq); 61 if (irq < 0) { 62 printk("cannot claim irq %d\n", c); 63 return irq; 64 } 65 66 i->txn_addr = txn_alloc_addr(irq); 67 i->txn_data = txn_alloc_data(irq); 68 i->irq = irq; 69 70 return irq; 71 } 72 73 EXPORT_SYMBOL(gsc_alloc_irq); 74 EXPORT_SYMBOL(gsc_claim_irq); 75 76 /* Common interrupt demultiplexer used by Asp, Lasi & Wax. */ 77 irqreturn_t gsc_asic_intr(int gsc_asic_irq, void *dev, struct pt_regs *regs) 78 { 79 unsigned long irr; 80 struct gsc_asic *gsc_asic = dev; 81 82 irr = gsc_readl(gsc_asic->hpa + OFFSET_IRR); 83 if (irr == 0) 84 return IRQ_NONE; 85 86 DEBPRINTK("%s intr, mask=0x%x\n", gsc_asic->name, irr); 87 88 do { 89 int local_irq = __ffs(irr); 90 unsigned int irq = gsc_asic->global_irq[local_irq]; 91 __do_IRQ(irq, regs); 92 irr &= ~(1 << local_irq); 93 } while (irr); 94 95 return IRQ_HANDLED; 96 } 97 98 int gsc_find_local_irq(unsigned int irq, int *global_irqs, int limit) 99 { 100 int local_irq; 101 102 for (local_irq = 0; local_irq < limit; local_irq++) { 103 if (global_irqs[local_irq] == irq) 104 return local_irq; 105 } 106 107 return NO_IRQ; 108 } 109 110 static void gsc_asic_disable_irq(unsigned int irq) 111 { 112 struct gsc_asic *irq_dev = irq_desc[irq].handler_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", __FUNCTION__, 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 gsc_asic *irq_dev = irq_desc[irq].handler_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", __FUNCTION__, 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 hw_interrupt_type gsc_asic_interrupt_type = { 151 .typename = "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 hw_interrupt_type *type, void *data) 161 { 162 static int irq = GSC_IRQ_BASE; 163 164 if (irq > GSC_IRQ_MAX) 165 return NO_IRQ; 166 167 irq_desc[irq].handler = type; 168 irq_desc[irq].handler_data = data; 169 return irq++; 170 } 171 172 void gsc_asic_assign_irq(struct gsc_asic *asic, int local_irq, int *irqp) 173 { 174 int irq = asic->global_irq[local_irq]; 175 176 if (irq <= 0) { 177 irq = gsc_assign_irq(&gsc_asic_interrupt_type, asic); 178 if (irq == NO_IRQ) 179 return; 180 181 asic->global_irq[local_irq] = irq; 182 } 183 *irqp = irq; 184 } 185 186 void gsc_fixup_irqs(struct parisc_device *parent, void *ctrl, 187 void (*choose_irq)(struct parisc_device *, void *)) 188 { 189 struct device *dev; 190 191 list_for_each_entry(dev, &parent->dev.children, node) { 192 struct parisc_device *padev = to_parisc_device(dev); 193 194 /* work-around for 715/64 and others which have parent 195 at path [5] and children at path [5/0/x] */ 196 if (padev->id.hw_type == HPHW_FAULTY) 197 return gsc_fixup_irqs(padev, ctrl, choose_irq); 198 choose_irq(padev, ctrl); 199 } 200 } 201 202 int gsc_common_setup(struct parisc_device *parent, struct gsc_asic *gsc_asic) 203 { 204 struct resource *res; 205 int i; 206 207 gsc_asic->gsc = parent; 208 209 /* Initialise local irq -> global irq mapping */ 210 for (i = 0; i < 32; i++) { 211 gsc_asic->global_irq[i] = NO_IRQ; 212 } 213 214 /* allocate resource region */ 215 res = request_mem_region(gsc_asic->hpa, 0x100000, gsc_asic->name); 216 if (res) { 217 res->flags = IORESOURCE_MEM; /* do not mark it busy ! */ 218 } 219 220 #if 0 221 printk(KERN_WARNING "%s IRQ %d EIM 0x%x", gsc_asic->name, 222 parent->irq, gsc_asic->eim); 223 if (gsc_readl(gsc_asic->hpa + OFFSET_IMR)) 224 printk(" IMR is non-zero! (0x%x)", 225 gsc_readl(gsc_asic->hpa + OFFSET_IMR)); 226 printk("\n"); 227 #endif 228 229 return 0; 230 } 231 232 extern struct parisc_driver lasi_driver; 233 extern struct parisc_driver asp_driver; 234 extern struct parisc_driver wax_driver; 235 236 void __init gsc_init(void) 237 { 238 #ifdef CONFIG_GSC_LASI 239 register_parisc_driver(&lasi_driver); 240 register_parisc_driver(&asp_driver); 241 #endif 242 #ifdef CONFIG_GSC_WAX 243 register_parisc_driver(&wax_driver); 244 #endif 245 } 246