1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * linux/arch/alpha/kernel/sys_takara.c 4 * 5 * Copyright (C) 1995 David A Rusling 6 * Copyright (C) 1996 Jay A Estabrook 7 * Copyright (C) 1998, 1999 Richard Henderson 8 * 9 * Code supporting the TAKARA. 10 */ 11 12 #include <linux/kernel.h> 13 #include <linux/types.h> 14 #include <linux/mm.h> 15 #include <linux/sched.h> 16 #include <linux/pci.h> 17 #include <linux/init.h> 18 19 #include <asm/ptrace.h> 20 #include <asm/dma.h> 21 #include <asm/irq.h> 22 #include <asm/mmu_context.h> 23 #include <asm/io.h> 24 #include <asm/pgtable.h> 25 #include <asm/core_cia.h> 26 #include <asm/tlbflush.h> 27 28 #include "proto.h" 29 #include "irq_impl.h" 30 #include "pci_impl.h" 31 #include "machvec_impl.h" 32 #include "pc873xx.h" 33 34 /* Note mask bit is true for DISABLED irqs. */ 35 static unsigned long cached_irq_mask[2] = { -1, -1 }; 36 37 static inline void 38 takara_update_irq_hw(unsigned long irq, unsigned long mask) 39 { 40 int regaddr; 41 42 mask = (irq >= 64 ? mask << 16 : mask >> ((irq - 16) & 0x30)); 43 regaddr = 0x510 + (((irq - 16) >> 2) & 0x0c); 44 outl(mask & 0xffff0000UL, regaddr); 45 } 46 47 static inline void 48 takara_enable_irq(struct irq_data *d) 49 { 50 unsigned int irq = d->irq; 51 unsigned long mask; 52 mask = (cached_irq_mask[irq >= 64] &= ~(1UL << (irq & 63))); 53 takara_update_irq_hw(irq, mask); 54 } 55 56 static void 57 takara_disable_irq(struct irq_data *d) 58 { 59 unsigned int irq = d->irq; 60 unsigned long mask; 61 mask = (cached_irq_mask[irq >= 64] |= 1UL << (irq & 63)); 62 takara_update_irq_hw(irq, mask); 63 } 64 65 static struct irq_chip takara_irq_type = { 66 .name = "TAKARA", 67 .irq_unmask = takara_enable_irq, 68 .irq_mask = takara_disable_irq, 69 .irq_mask_ack = takara_disable_irq, 70 }; 71 72 static void 73 takara_device_interrupt(unsigned long vector) 74 { 75 unsigned intstatus; 76 77 /* 78 * The PALcode will have passed us vectors 0x800 or 0x810, 79 * which are fairly arbitrary values and serve only to tell 80 * us whether an interrupt has come in on IRQ0 or IRQ1. If 81 * it's IRQ1 it's a PCI interrupt; if it's IRQ0, it's 82 * probably ISA, but PCI interrupts can come through IRQ0 83 * as well if the interrupt controller isn't in accelerated 84 * mode. 85 * 86 * OTOH, the accelerator thing doesn't seem to be working 87 * overly well, so what we'll do instead is try directly 88 * examining the Master Interrupt Register to see if it's a 89 * PCI interrupt, and if _not_ then we'll pass it on to the 90 * ISA handler. 91 */ 92 93 intstatus = inw(0x500) & 15; 94 if (intstatus) { 95 /* 96 * This is a PCI interrupt. Check each bit and 97 * despatch an interrupt if it's set. 98 */ 99 100 if (intstatus & 8) handle_irq(16+3); 101 if (intstatus & 4) handle_irq(16+2); 102 if (intstatus & 2) handle_irq(16+1); 103 if (intstatus & 1) handle_irq(16+0); 104 } else { 105 isa_device_interrupt (vector); 106 } 107 } 108 109 static void 110 takara_srm_device_interrupt(unsigned long vector) 111 { 112 int irq = (vector - 0x800) >> 4; 113 handle_irq(irq); 114 } 115 116 static void __init 117 takara_init_irq(void) 118 { 119 long i; 120 121 init_i8259a_irqs(); 122 123 if (alpha_using_srm) { 124 alpha_mv.device_interrupt = takara_srm_device_interrupt; 125 } else { 126 unsigned int ctlreg = inl(0x500); 127 128 /* Return to non-accelerated mode. */ 129 ctlreg &= ~0x8000; 130 outl(ctlreg, 0x500); 131 132 /* Enable the PCI interrupt register. */ 133 ctlreg = 0x05107c00; 134 outl(ctlreg, 0x500); 135 } 136 137 for (i = 16; i < 128; i += 16) 138 takara_update_irq_hw(i, -1); 139 140 for (i = 16; i < 128; ++i) { 141 irq_set_chip_and_handler(i, &takara_irq_type, 142 handle_level_irq); 143 irq_set_status_flags(i, IRQ_LEVEL); 144 } 145 146 common_init_isa_dma(); 147 } 148 149 150 /* 151 * The Takara has PCI devices 1, 2, and 3 configured to slots 20, 152 * 19, and 18 respectively, in the default configuration. They can 153 * also be jumpered to slots 8, 7, and 6 respectively, which is fun 154 * because the SIO ISA bridge can also be slot 7. However, the SIO 155 * doesn't explicitly generate PCI-type interrupts, so we can 156 * assign it whatever the hell IRQ we like and it doesn't matter. 157 */ 158 159 static int 160 takara_map_irq_srm(const struct pci_dev *dev, u8 slot, u8 pin) 161 { 162 static char irq_tab[15][5] = { 163 { 16+3, 16+3, 16+3, 16+3, 16+3}, /* slot 6 == device 3 */ 164 { 16+2, 16+2, 16+2, 16+2, 16+2}, /* slot 7 == device 2 */ 165 { 16+1, 16+1, 16+1, 16+1, 16+1}, /* slot 8 == device 1 */ 166 { -1, -1, -1, -1, -1}, /* slot 9 == nothing */ 167 { -1, -1, -1, -1, -1}, /* slot 10 == nothing */ 168 { -1, -1, -1, -1, -1}, /* slot 11 == nothing */ 169 /* These are behind the bridges. */ 170 { 12, 12, 13, 14, 15}, /* slot 12 == nothing */ 171 { 8, 8, 9, 19, 11}, /* slot 13 == nothing */ 172 { 4, 4, 5, 6, 7}, /* slot 14 == nothing */ 173 { 0, 0, 1, 2, 3}, /* slot 15 == nothing */ 174 { -1, -1, -1, -1, -1}, /* slot 16 == nothing */ 175 {64+ 0, 64+0, 64+1, 64+2, 64+3}, /* slot 17= device 4 */ 176 {48+ 0, 48+0, 48+1, 48+2, 48+3}, /* slot 18= device 3 */ 177 {32+ 0, 32+0, 32+1, 32+2, 32+3}, /* slot 19= device 2 */ 178 {16+ 0, 16+0, 16+1, 16+2, 16+3}, /* slot 20= device 1 */ 179 }; 180 const long min_idsel = 6, max_idsel = 20, irqs_per_slot = 5; 181 int irq = COMMON_TABLE_LOOKUP; 182 if (irq >= 0 && irq < 16) { 183 /* Guess that we are behind a bridge. */ 184 unsigned int busslot = PCI_SLOT(dev->bus->self->devfn); 185 irq += irq_tab[busslot-min_idsel][0]; 186 } 187 return irq; 188 } 189 190 static int __init 191 takara_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) 192 { 193 static char irq_tab[15][5] __initdata = { 194 { 16+3, 16+3, 16+3, 16+3, 16+3}, /* slot 6 == device 3 */ 195 { 16+2, 16+2, 16+2, 16+2, 16+2}, /* slot 7 == device 2 */ 196 { 16+1, 16+1, 16+1, 16+1, 16+1}, /* slot 8 == device 1 */ 197 { -1, -1, -1, -1, -1}, /* slot 9 == nothing */ 198 { -1, -1, -1, -1, -1}, /* slot 10 == nothing */ 199 { -1, -1, -1, -1, -1}, /* slot 11 == nothing */ 200 { -1, -1, -1, -1, -1}, /* slot 12 == nothing */ 201 { -1, -1, -1, -1, -1}, /* slot 13 == nothing */ 202 { -1, -1, -1, -1, -1}, /* slot 14 == nothing */ 203 { -1, -1, -1, -1, -1}, /* slot 15 == nothing */ 204 { -1, -1, -1, -1, -1}, /* slot 16 == nothing */ 205 { -1, -1, -1, -1, -1}, /* slot 17 == nothing */ 206 { 16+3, 16+3, 16+3, 16+3, 16+3}, /* slot 18 == device 3 */ 207 { 16+2, 16+2, 16+2, 16+2, 16+2}, /* slot 19 == device 2 */ 208 { 16+1, 16+1, 16+1, 16+1, 16+1}, /* slot 20 == device 1 */ 209 }; 210 const long min_idsel = 6, max_idsel = 20, irqs_per_slot = 5; 211 return COMMON_TABLE_LOOKUP; 212 } 213 214 static u8 215 takara_swizzle(struct pci_dev *dev, u8 *pinp) 216 { 217 int slot = PCI_SLOT(dev->devfn); 218 int pin = *pinp; 219 unsigned int ctlreg = inl(0x500); 220 unsigned int busslot; 221 222 if (!dev->bus->self) 223 return slot; 224 225 busslot = PCI_SLOT(dev->bus->self->devfn); 226 /* Check for built-in bridges. */ 227 if (dev->bus->number != 0 228 && busslot > 16 229 && ((1<<(36-busslot)) & ctlreg)) { 230 if (pin == 1) 231 pin += (20 - busslot); 232 else { 233 printk(KERN_WARNING "takara_swizzle: can only " 234 "handle cards with INTA IRQ pin.\n"); 235 } 236 } else { 237 /* Must be a card-based bridge. */ 238 printk(KERN_WARNING "takara_swizzle: cannot handle " 239 "card-bridge behind builtin bridge yet.\n"); 240 } 241 242 *pinp = pin; 243 return slot; 244 } 245 246 static void __init 247 takara_init_pci(void) 248 { 249 if (alpha_using_srm) 250 alpha_mv.pci_map_irq = takara_map_irq_srm; 251 252 cia_init_pci(); 253 254 if (pc873xx_probe() == -1) { 255 printk(KERN_ERR "Probing for PC873xx Super IO chip failed.\n"); 256 } else { 257 printk(KERN_INFO "Found %s Super IO chip at 0x%x\n", 258 pc873xx_get_model(), pc873xx_get_base()); 259 pc873xx_enable_ide(); 260 } 261 } 262 263 264 /* 265 * The System Vector 266 */ 267 268 struct alpha_machine_vector takara_mv __initmv = { 269 .vector_name = "Takara", 270 DO_EV5_MMU, 271 DO_DEFAULT_RTC, 272 DO_CIA_IO, 273 .machine_check = cia_machine_check, 274 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS, 275 .min_io_address = DEFAULT_IO_BASE, 276 .min_mem_address = CIA_DEFAULT_MEM_BASE, 277 278 .nr_irqs = 128, 279 .device_interrupt = takara_device_interrupt, 280 281 .init_arch = cia_init_arch, 282 .init_irq = takara_init_irq, 283 .init_rtc = common_init_rtc, 284 .init_pci = takara_init_pci, 285 .kill_arch = cia_kill_arch, 286 .pci_map_irq = takara_map_irq, 287 .pci_swizzle = takara_swizzle, 288 }; 289 ALIAS_MV(takara) 290