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(struct irq_data *d) 109 { 110 struct gsc_asic *irq_dev = irq_data_get_irq_chip_data(d); 111 int local_irq = gsc_find_local_irq(d->irq, irq_dev->global_irq, 32); 112 u32 imr; 113 114 DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, d->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(struct irq_data *d) 124 { 125 struct gsc_asic *irq_dev = irq_data_get_irq_chip_data(d); 126 int local_irq = gsc_find_local_irq(d->irq, irq_dev->global_irq, 32); 127 u32 imr; 128 129 DEBPRINTK(KERN_DEBUG "%s(%d) %s: IMR 0x%x\n", __func__, d->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 .irq_unmask = gsc_asic_unmask_irq, 145 .irq_mask = gsc_asic_mask_irq, 146 }; 147 148 int gsc_assign_irq(struct irq_chip *type, void *data) 149 { 150 static int irq = GSC_IRQ_BASE; 151 152 if (irq > GSC_IRQ_MAX) 153 return NO_IRQ; 154 155 irq_set_chip_and_handler(irq, type, handle_simple_irq); 156 irq_set_chip_data(irq, data); 157 158 return irq++; 159 } 160 161 void gsc_asic_assign_irq(struct gsc_asic *asic, int local_irq, int *irqp) 162 { 163 int irq = asic->global_irq[local_irq]; 164 165 if (irq <= 0) { 166 irq = gsc_assign_irq(&gsc_asic_interrupt_type, asic); 167 if (irq == NO_IRQ) 168 return; 169 170 asic->global_irq[local_irq] = irq; 171 } 172 *irqp = irq; 173 } 174 175 struct gsc_fixup_struct { 176 void (*choose_irq)(struct parisc_device *, void *); 177 void *ctrl; 178 }; 179 180 static int gsc_fixup_irqs_callback(struct device *dev, void *data) 181 { 182 struct parisc_device *padev = to_parisc_device(dev); 183 struct gsc_fixup_struct *gf = data; 184 185 /* work-around for 715/64 and others which have parent 186 at path [5] and children at path [5/0/x] */ 187 if (padev->id.hw_type == HPHW_FAULTY) 188 gsc_fixup_irqs(padev, gf->ctrl, gf->choose_irq); 189 gf->choose_irq(padev, gf->ctrl); 190 191 return 0; 192 } 193 194 void gsc_fixup_irqs(struct parisc_device *parent, void *ctrl, 195 void (*choose_irq)(struct parisc_device *, void *)) 196 { 197 struct gsc_fixup_struct data = { 198 .choose_irq = choose_irq, 199 .ctrl = ctrl, 200 }; 201 202 device_for_each_child(&parent->dev, &data, gsc_fixup_irqs_callback); 203 } 204 205 int gsc_common_setup(struct parisc_device *parent, struct gsc_asic *gsc_asic) 206 { 207 struct resource *res; 208 int i; 209 210 gsc_asic->gsc = parent; 211 212 /* Initialise local irq -> global irq mapping */ 213 for (i = 0; i < 32; i++) { 214 gsc_asic->global_irq[i] = NO_IRQ; 215 } 216 217 /* allocate resource region */ 218 res = request_mem_region(gsc_asic->hpa, 0x100000, gsc_asic->name); 219 if (res) { 220 res->flags = IORESOURCE_MEM; /* do not mark it busy ! */ 221 } 222 223 #if 0 224 printk(KERN_WARNING "%s IRQ %d EIM 0x%x", gsc_asic->name, 225 parent->irq, gsc_asic->eim); 226 if (gsc_readl(gsc_asic->hpa + OFFSET_IMR)) 227 printk(" IMR is non-zero! (0x%x)", 228 gsc_readl(gsc_asic->hpa + OFFSET_IMR)); 229 printk("\n"); 230 #endif 231 232 return 0; 233 } 234 235 extern struct parisc_driver lasi_driver; 236 extern struct parisc_driver asp_driver; 237 extern struct parisc_driver wax_driver; 238 239 void __init gsc_init(void) 240 { 241 #ifdef CONFIG_GSC_LASI 242 register_parisc_driver(&lasi_driver); 243 register_parisc_driver(&asp_driver); 244 #endif 245 #ifdef CONFIG_GSC_WAX 246 register_parisc_driver(&wax_driver); 247 #endif 248 } 249