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