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