1b2441318SGreg Kroah-Hartman // SPDX-License-Identifier: GPL-2.0 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * ip22-int.c: Routines for generic manipulation of the INT[23] ASIC 41da177e4SLinus Torvalds * found on INDY and Indigo2 workstations. 51da177e4SLinus Torvalds * 679add627SJustin P. Mattock * Copyright (C) 1996 David S. Miller (davem@davemloft.net) 71da177e4SLinus Torvalds * Copyright (C) 1997, 1998 Ralf Baechle (ralf@gnu.org) 81da177e4SLinus Torvalds * Copyright (C) 1999 Andrew R. Baker (andrewb@uab.edu) 91da177e4SLinus Torvalds * - Indigo2 changes 101da177e4SLinus Torvalds * - Interrupt handling fixes 111da177e4SLinus Torvalds * Copyright (C) 2001, 2003 Ladislav Michl (ladis@linux-mips.org) 121da177e4SLinus Torvalds */ 131da177e4SLinus Torvalds #include <linux/types.h> 141da177e4SLinus Torvalds #include <linux/init.h> 151da177e4SLinus Torvalds #include <linux/kernel_stat.h> 161da177e4SLinus Torvalds #include <linux/interrupt.h> 178f99a162SWu Zhangjin #include <linux/ftrace.h> 181da177e4SLinus Torvalds 1997dcb82dSAtsushi Nemoto #include <asm/irq_cpu.h> 201da177e4SLinus Torvalds #include <asm/sgi/hpc3.h> 211da177e4SLinus Torvalds #include <asm/sgi/ip22.h> 221da177e4SLinus Torvalds 231da177e4SLinus Torvalds /* So far nothing hangs here */ 241da177e4SLinus Torvalds #undef USE_LIO3_IRQ 251da177e4SLinus Torvalds 261da177e4SLinus Torvalds struct sgint_regs *sgint; 271da177e4SLinus Torvalds 281da177e4SLinus Torvalds static char lc0msk_to_irqnr[256]; 291da177e4SLinus Torvalds static char lc1msk_to_irqnr[256]; 301da177e4SLinus Torvalds static char lc2msk_to_irqnr[256]; 311da177e4SLinus Torvalds static char lc3msk_to_irqnr[256]; 321da177e4SLinus Torvalds 331da177e4SLinus Torvalds extern int ip22_eisa_init(void); 341da177e4SLinus Torvalds 359458ea56SThomas Gleixner static void enable_local0_irq(struct irq_data *d) 361da177e4SLinus Torvalds { 371da177e4SLinus Torvalds /* don't allow mappable interrupt to be enabled from setup_irq, 381da177e4SLinus Torvalds * we have our own way to do so */ 399458ea56SThomas Gleixner if (d->irq != SGI_MAP_0_IRQ) 409458ea56SThomas Gleixner sgint->imask0 |= (1 << (d->irq - SGINT_LOCAL0)); 411da177e4SLinus Torvalds } 421da177e4SLinus Torvalds 439458ea56SThomas Gleixner static void disable_local0_irq(struct irq_data *d) 441da177e4SLinus Torvalds { 459458ea56SThomas Gleixner sgint->imask0 &= ~(1 << (d->irq - SGINT_LOCAL0)); 461da177e4SLinus Torvalds } 471da177e4SLinus Torvalds 4894dee171SRalf Baechle static struct irq_chip ip22_local0_irq_type = { 4970d21cdeSAtsushi Nemoto .name = "IP22 local 0", 509458ea56SThomas Gleixner .irq_mask = disable_local0_irq, 519458ea56SThomas Gleixner .irq_unmask = enable_local0_irq, 521da177e4SLinus Torvalds }; 531da177e4SLinus Torvalds 549458ea56SThomas Gleixner static void enable_local1_irq(struct irq_data *d) 551da177e4SLinus Torvalds { 561da177e4SLinus Torvalds /* don't allow mappable interrupt to be enabled from setup_irq, 571da177e4SLinus Torvalds * we have our own way to do so */ 589458ea56SThomas Gleixner if (d->irq != SGI_MAP_1_IRQ) 599458ea56SThomas Gleixner sgint->imask1 |= (1 << (d->irq - SGINT_LOCAL1)); 601da177e4SLinus Torvalds } 611da177e4SLinus Torvalds 629458ea56SThomas Gleixner static void disable_local1_irq(struct irq_data *d) 631da177e4SLinus Torvalds { 649458ea56SThomas Gleixner sgint->imask1 &= ~(1 << (d->irq - SGINT_LOCAL1)); 651da177e4SLinus Torvalds } 661da177e4SLinus Torvalds 6794dee171SRalf Baechle static struct irq_chip ip22_local1_irq_type = { 6870d21cdeSAtsushi Nemoto .name = "IP22 local 1", 699458ea56SThomas Gleixner .irq_mask = disable_local1_irq, 709458ea56SThomas Gleixner .irq_unmask = enable_local1_irq, 711da177e4SLinus Torvalds }; 721da177e4SLinus Torvalds 739458ea56SThomas Gleixner static void enable_local2_irq(struct irq_data *d) 741da177e4SLinus Torvalds { 751da177e4SLinus Torvalds sgint->imask0 |= (1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0)); 769458ea56SThomas Gleixner sgint->cmeimask0 |= (1 << (d->irq - SGINT_LOCAL2)); 771da177e4SLinus Torvalds } 781da177e4SLinus Torvalds 799458ea56SThomas Gleixner static void disable_local2_irq(struct irq_data *d) 801da177e4SLinus Torvalds { 819458ea56SThomas Gleixner sgint->cmeimask0 &= ~(1 << (d->irq - SGINT_LOCAL2)); 821da177e4SLinus Torvalds if (!sgint->cmeimask0) 831da177e4SLinus Torvalds sgint->imask0 &= ~(1 << (SGI_MAP_0_IRQ - SGINT_LOCAL0)); 841da177e4SLinus Torvalds } 851da177e4SLinus Torvalds 8694dee171SRalf Baechle static struct irq_chip ip22_local2_irq_type = { 8770d21cdeSAtsushi Nemoto .name = "IP22 local 2", 889458ea56SThomas Gleixner .irq_mask = disable_local2_irq, 899458ea56SThomas Gleixner .irq_unmask = enable_local2_irq, 901da177e4SLinus Torvalds }; 911da177e4SLinus Torvalds 929458ea56SThomas Gleixner static void enable_local3_irq(struct irq_data *d) 931da177e4SLinus Torvalds { 941da177e4SLinus Torvalds sgint->imask1 |= (1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1)); 959458ea56SThomas Gleixner sgint->cmeimask1 |= (1 << (d->irq - SGINT_LOCAL3)); 961da177e4SLinus Torvalds } 971da177e4SLinus Torvalds 989458ea56SThomas Gleixner static void disable_local3_irq(struct irq_data *d) 991da177e4SLinus Torvalds { 1009458ea56SThomas Gleixner sgint->cmeimask1 &= ~(1 << (d->irq - SGINT_LOCAL3)); 1011da177e4SLinus Torvalds if (!sgint->cmeimask1) 1021da177e4SLinus Torvalds sgint->imask1 &= ~(1 << (SGI_MAP_1_IRQ - SGINT_LOCAL1)); 1031da177e4SLinus Torvalds } 1041da177e4SLinus Torvalds 10594dee171SRalf Baechle static struct irq_chip ip22_local3_irq_type = { 10670d21cdeSAtsushi Nemoto .name = "IP22 local 3", 1079458ea56SThomas Gleixner .irq_mask = disable_local3_irq, 1089458ea56SThomas Gleixner .irq_unmask = enable_local3_irq, 1091da177e4SLinus Torvalds }; 1101da177e4SLinus Torvalds 111937a8015SRalf Baechle static void indy_local0_irqdispatch(void) 1121da177e4SLinus Torvalds { 1131da177e4SLinus Torvalds u8 mask = sgint->istat0 & sgint->imask0; 1141da177e4SLinus Torvalds u8 mask2; 1151da177e4SLinus Torvalds int irq; 1161da177e4SLinus Torvalds 1171da177e4SLinus Torvalds if (mask & SGINT_ISTAT0_LIO2) { 1181da177e4SLinus Torvalds mask2 = sgint->vmeistat & sgint->cmeimask0; 1191da177e4SLinus Torvalds irq = lc2msk_to_irqnr[mask2]; 1201da177e4SLinus Torvalds } else 1211da177e4SLinus Torvalds irq = lc0msk_to_irqnr[mask]; 1221da177e4SLinus Torvalds 1231d421ca9SThomas Bogendoerfer /* 1241d421ca9SThomas Bogendoerfer * workaround for INT2 bug; if irq == 0, INT2 has seen a fifo full 1251d421ca9SThomas Bogendoerfer * irq, but failed to latch it into status register 1261d421ca9SThomas Bogendoerfer */ 1271da177e4SLinus Torvalds if (irq) 128937a8015SRalf Baechle do_IRQ(irq); 1291d421ca9SThomas Bogendoerfer else 1301d421ca9SThomas Bogendoerfer do_IRQ(SGINT_LOCAL0 + 0); 1311da177e4SLinus Torvalds } 1321da177e4SLinus Torvalds 133937a8015SRalf Baechle static void indy_local1_irqdispatch(void) 1341da177e4SLinus Torvalds { 1351da177e4SLinus Torvalds u8 mask = sgint->istat1 & sgint->imask1; 1361da177e4SLinus Torvalds u8 mask2; 1371da177e4SLinus Torvalds int irq; 1381da177e4SLinus Torvalds 1391da177e4SLinus Torvalds if (mask & SGINT_ISTAT1_LIO3) { 1401da177e4SLinus Torvalds mask2 = sgint->vmeistat & sgint->cmeimask1; 1411da177e4SLinus Torvalds irq = lc3msk_to_irqnr[mask2]; 1421da177e4SLinus Torvalds } else 1431da177e4SLinus Torvalds irq = lc1msk_to_irqnr[mask]; 1441da177e4SLinus Torvalds 1451da177e4SLinus Torvalds /* if irq == 0, then the interrupt has already been cleared */ 1461da177e4SLinus Torvalds if (irq) 147937a8015SRalf Baechle do_IRQ(irq); 1481da177e4SLinus Torvalds } 1491da177e4SLinus Torvalds 150937a8015SRalf Baechle extern void ip22_be_interrupt(int irq); 1511da177e4SLinus Torvalds 1528f99a162SWu Zhangjin static void __irq_entry indy_buserror_irq(void) 1531da177e4SLinus Torvalds { 1541da177e4SLinus Torvalds int irq = SGI_BUSERR_IRQ; 1551da177e4SLinus Torvalds 1561da177e4SLinus Torvalds irq_enter(); 157310ff2c8SThomas Gleixner kstat_incr_irq_this_cpu(irq); 158937a8015SRalf Baechle ip22_be_interrupt(irq); 1591da177e4SLinus Torvalds irq_exit(); 1601da177e4SLinus Torvalds } 1611da177e4SLinus Torvalds 1621da177e4SLinus Torvalds #ifdef USE_LIO3_IRQ 1631da177e4SLinus Torvalds #define SGI_INTERRUPTS SGINT_END 1641da177e4SLinus Torvalds #else 1651da177e4SLinus Torvalds #define SGI_INTERRUPTS SGINT_LOCAL3 1661da177e4SLinus Torvalds #endif 1671da177e4SLinus Torvalds 168937a8015SRalf Baechle extern void indy_8254timer_irq(void); 169e4ac58afSRalf Baechle 170e4ac58afSRalf Baechle /* 171e4ac58afSRalf Baechle * IRQs on the INDY look basically (barring software IRQs which we don't use 172e4ac58afSRalf Baechle * at all) like: 173e4ac58afSRalf Baechle * 174e4ac58afSRalf Baechle * MIPS IRQ Source 175e4ac58afSRalf Baechle * -------- ------ 176e4ac58afSRalf Baechle * 0 Software (ignored) 177e4ac58afSRalf Baechle * 1 Software (ignored) 178e4ac58afSRalf Baechle * 2 Local IRQ level zero 179e4ac58afSRalf Baechle * 3 Local IRQ level one 180e4ac58afSRalf Baechle * 4 8254 Timer zero 181e4ac58afSRalf Baechle * 5 8254 Timer one 182e4ac58afSRalf Baechle * 6 Bus Error 183e4ac58afSRalf Baechle * 7 R4k timer (what we use) 184e4ac58afSRalf Baechle * 185e4ac58afSRalf Baechle * We handle the IRQ according to _our_ priority which is: 186e4ac58afSRalf Baechle * 187e4ac58afSRalf Baechle * Highest ---- R4k Timer 188e4ac58afSRalf Baechle * Local IRQ zero 189e4ac58afSRalf Baechle * Local IRQ one 190e4ac58afSRalf Baechle * Bus Error 191e4ac58afSRalf Baechle * 8254 Timer zero 192e4ac58afSRalf Baechle * Lowest ---- 8254 Timer one 193e4ac58afSRalf Baechle * 194e4ac58afSRalf Baechle * then we just return, if multiple IRQs are pending then we will just take 195e4ac58afSRalf Baechle * another exception, big deal. 196e4ac58afSRalf Baechle */ 197e4ac58afSRalf Baechle 198937a8015SRalf Baechle asmlinkage void plat_irq_dispatch(void) 199e4ac58afSRalf Baechle { 200119537c0SThiemo Seufer unsigned int pending = read_c0_status() & read_c0_cause(); 201e4ac58afSRalf Baechle 202e4ac58afSRalf Baechle /* 203e4ac58afSRalf Baechle * First we check for r4k counter/timer IRQ. 204e4ac58afSRalf Baechle */ 205e4ac58afSRalf Baechle if (pending & CAUSEF_IP7) 2067bcf7717SRalf Baechle do_IRQ(SGI_TIMER_IRQ); 207e4ac58afSRalf Baechle else if (pending & CAUSEF_IP2) 208937a8015SRalf Baechle indy_local0_irqdispatch(); 209e4ac58afSRalf Baechle else if (pending & CAUSEF_IP3) 210937a8015SRalf Baechle indy_local1_irqdispatch(); 211e4ac58afSRalf Baechle else if (pending & CAUSEF_IP6) 212937a8015SRalf Baechle indy_buserror_irq(); 213e4ac58afSRalf Baechle else if (pending & (CAUSEF_IP4 | CAUSEF_IP5)) 214937a8015SRalf Baechle indy_8254timer_irq(); 215e4ac58afSRalf Baechle } 216e4ac58afSRalf Baechle 2171da177e4SLinus Torvalds void __init arch_init_irq(void) 2181da177e4SLinus Torvalds { 2191da177e4SLinus Torvalds int i; 2201da177e4SLinus Torvalds 2211da177e4SLinus Torvalds /* Init local mask --> irq tables. */ 2221da177e4SLinus Torvalds for (i = 0; i < 256; i++) { 2231da177e4SLinus Torvalds if (i & 0x80) { 2241da177e4SLinus Torvalds lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 7; 2251da177e4SLinus Torvalds lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 7; 2261da177e4SLinus Torvalds lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 7; 2271da177e4SLinus Torvalds lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 7; 2281da177e4SLinus Torvalds } else if (i & 0x40) { 2291da177e4SLinus Torvalds lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 6; 2301da177e4SLinus Torvalds lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 6; 2311da177e4SLinus Torvalds lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 6; 2321da177e4SLinus Torvalds lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 6; 2331da177e4SLinus Torvalds } else if (i & 0x20) { 2341da177e4SLinus Torvalds lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 5; 2351da177e4SLinus Torvalds lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 5; 2361da177e4SLinus Torvalds lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 5; 2371da177e4SLinus Torvalds lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 5; 2381da177e4SLinus Torvalds } else if (i & 0x10) { 2391da177e4SLinus Torvalds lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 4; 2401da177e4SLinus Torvalds lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 4; 2411da177e4SLinus Torvalds lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 4; 2421da177e4SLinus Torvalds lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 4; 2431da177e4SLinus Torvalds } else if (i & 0x08) { 2441da177e4SLinus Torvalds lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 3; 2451da177e4SLinus Torvalds lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 3; 2461da177e4SLinus Torvalds lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 3; 2471da177e4SLinus Torvalds lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 3; 2481da177e4SLinus Torvalds } else if (i & 0x04) { 2491da177e4SLinus Torvalds lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 2; 2501da177e4SLinus Torvalds lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 2; 2511da177e4SLinus Torvalds lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 2; 2521da177e4SLinus Torvalds lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 2; 2531da177e4SLinus Torvalds } else if (i & 0x02) { 2541da177e4SLinus Torvalds lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 1; 2551da177e4SLinus Torvalds lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 1; 2561da177e4SLinus Torvalds lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 1; 2571da177e4SLinus Torvalds lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 1; 2581da177e4SLinus Torvalds } else if (i & 0x01) { 2591da177e4SLinus Torvalds lc0msk_to_irqnr[i] = SGINT_LOCAL0 + 0; 2601da177e4SLinus Torvalds lc1msk_to_irqnr[i] = SGINT_LOCAL1 + 0; 2611da177e4SLinus Torvalds lc2msk_to_irqnr[i] = SGINT_LOCAL2 + 0; 2621da177e4SLinus Torvalds lc3msk_to_irqnr[i] = SGINT_LOCAL3 + 0; 2631da177e4SLinus Torvalds } else { 2641da177e4SLinus Torvalds lc0msk_to_irqnr[i] = 0; 2651da177e4SLinus Torvalds lc1msk_to_irqnr[i] = 0; 2661da177e4SLinus Torvalds lc2msk_to_irqnr[i] = 0; 2671da177e4SLinus Torvalds lc3msk_to_irqnr[i] = 0; 2681da177e4SLinus Torvalds } 2691da177e4SLinus Torvalds } 2701da177e4SLinus Torvalds 2711da177e4SLinus Torvalds /* Mask out all interrupts. */ 2721da177e4SLinus Torvalds sgint->imask0 = 0; 2731da177e4SLinus Torvalds sgint->imask1 = 0; 2741da177e4SLinus Torvalds sgint->cmeimask0 = 0; 2751da177e4SLinus Torvalds sgint->cmeimask1 = 0; 2761da177e4SLinus Torvalds 2771da177e4SLinus Torvalds /* init CPU irqs */ 27897dcb82dSAtsushi Nemoto mips_cpu_irq_init(); 2791da177e4SLinus Torvalds 2801da177e4SLinus Torvalds for (i = SGINT_LOCAL0; i < SGI_INTERRUPTS; i++) { 28194dee171SRalf Baechle struct irq_chip *handler; 2821da177e4SLinus Torvalds 2831da177e4SLinus Torvalds if (i < SGINT_LOCAL1) 2841da177e4SLinus Torvalds handler = &ip22_local0_irq_type; 2851da177e4SLinus Torvalds else if (i < SGINT_LOCAL2) 2861da177e4SLinus Torvalds handler = &ip22_local1_irq_type; 2871da177e4SLinus Torvalds else if (i < SGINT_LOCAL3) 2881da177e4SLinus Torvalds handler = &ip22_local2_irq_type; 2891da177e4SLinus Torvalds else 2901da177e4SLinus Torvalds handler = &ip22_local3_irq_type; 2911da177e4SLinus Torvalds 292e4ec7989SThomas Gleixner irq_set_chip_and_handler(i, handler, handle_level_irq); 2931da177e4SLinus Torvalds } 2941da177e4SLinus Torvalds 2951da177e4SLinus Torvalds /* vector handler. this register the IRQ as non-sharable */ 296*ac8fd122Safzal mohammed if (request_irq(SGI_LOCAL_0_IRQ, no_action, IRQF_NO_THREAD, 297*ac8fd122Safzal mohammed "local0 cascade", NULL)) 298*ac8fd122Safzal mohammed pr_err("Failed to register local0 cascade interrupt\n"); 299*ac8fd122Safzal mohammed if (request_irq(SGI_LOCAL_1_IRQ, no_action, IRQF_NO_THREAD, 300*ac8fd122Safzal mohammed "local1 cascade", NULL)) 301*ac8fd122Safzal mohammed pr_err("Failed to register local1 cascade interrupt\n"); 302*ac8fd122Safzal mohammed if (request_irq(SGI_BUSERR_IRQ, no_action, IRQF_NO_THREAD, 303*ac8fd122Safzal mohammed "Bus Error", NULL)) 304*ac8fd122Safzal mohammed pr_err("Failed to register Bus Error interrupt\n"); 3051da177e4SLinus Torvalds 3061da177e4SLinus Torvalds /* cascade in cascade. i love Indy ;-) */ 307*ac8fd122Safzal mohammed if (request_irq(SGI_MAP_0_IRQ, no_action, IRQF_NO_THREAD, 308*ac8fd122Safzal mohammed "mapable0 cascade", NULL)) 309*ac8fd122Safzal mohammed pr_err("Failed to register mapable0 cascade interrupt\n"); 3101da177e4SLinus Torvalds #ifdef USE_LIO3_IRQ 311*ac8fd122Safzal mohammed if (request_irq(SGI_MAP_1_IRQ, no_action, IRQF_NO_THREAD, 312*ac8fd122Safzal mohammed "mapable1 cascade", NULL)) 313*ac8fd122Safzal mohammed pr_err("Failed to register mapable1 cascade interrupt\n"); 3141da177e4SLinus Torvalds #endif 3151da177e4SLinus Torvalds 3161da177e4SLinus Torvalds #ifdef CONFIG_EISA 3171da177e4SLinus Torvalds if (ip22_is_fullhouse()) /* Only Indigo-2 has EISA stuff */ 3181da177e4SLinus Torvalds ip22_eisa_init(); 3191da177e4SLinus Torvalds #endif 3201da177e4SLinus Torvalds } 321