2 * SGI Visual Workstation support and quirks, unmaintained.
4 * Split out from setup.c by davej@suse.de
6 * Copyright (C) 1999 Bent Hagemark, Ingo Molnar
8 * SGI Visual Workstation interrupt controller
10 * The Cobalt system ASIC in the Visual Workstation contains a "Cobalt" APIC
11 * which serves as the main interrupt controller in the system. Non-legacy
12 * hardware in the system uses this controller directly. Legacy devices
13 * are connected to the PIIX4 which in turn has its 8259(s) connected to
14 * a of the Cobalt APIC entry.
16 * 09/02/2000 - Updated for 2.4 by jbarnes@sgi.com
18 * 25/11/2002 - Updated for 2.5 by Andrey Panin <pazke@orbita1.ru>
20 #include <linux/interrupt.h>
21 #include <linux/module.h>
22 #include <linux/init.h>
23 #include <linux/smp.h>
25 #include <asm/visws/cobalt.h>
26 #include <asm/visws/piix4.h>
27 #include <asm/arch_hooks.h>
28 #include <asm/fixmap.h>
29 #include <asm/reboot.h>
30 #include <asm/setup.h>
37 #include "mach_apic.h"
39 #include <linux/init.h>
40 #include <linux/smp.h>
42 #include <linux/kernel_stat.h>
43 #include <linux/interrupt.h>
44 #include <linux/init.h>
48 #include <asm/i8259.h>
49 #include <asm/irq_vectors.h>
50 #include <asm/visws/cobalt.h>
51 #include <asm/visws/lithium.h>
52 #include <asm/visws/piix4.h>
54 #include <linux/sched.h>
55 #include <linux/kernel.h>
56 #include <linux/init.h>
57 #include <linux/pci.h>
58 #include <linux/pci_ids.h>
60 extern int no_broadcast;
64 #include <asm/arch_hooks.h>
65 #include <asm/visws/cobalt.h>
66 #include <asm/visws/lithium.h>
68 char visws_board_type = -1;
69 char visws_board_rev = -1;
71 int is_visws_box(void)
73 return visws_board_type >= 0;
76 static int __init visws_time_init(void)
78 printk(KERN_INFO "Starting Cobalt Timer system clock\n");
80 /* Set the countdown value */
81 co_cpu_write(CO_CPU_TIMEVAL, CO_TIME_HZ/HZ);
84 co_cpu_write(CO_CPU_CTRL, co_cpu_read(CO_CPU_CTRL) | CO_CTRL_TIMERUN);
86 /* Enable (unmask) the timer interrupt */
87 co_cpu_write(CO_CPU_CTRL, co_cpu_read(CO_CPU_CTRL) & ~CO_CTRL_TIMEMASK);
90 * Zero return means the generic timer setup code will set up
91 * the standard vector:
96 static int __init visws_pre_intr_init(void)
98 init_VISWS_APIC_irqs();
101 * We dont want ISA irqs to be set up by the generic code:
106 /* Quirk for machine specific memory setup. */
108 #define MB (1024 * 1024)
110 unsigned long sgivwfb_mem_phys;
111 unsigned long sgivwfb_mem_size;
112 EXPORT_SYMBOL(sgivwfb_mem_phys);
113 EXPORT_SYMBOL(sgivwfb_mem_size);
115 long long mem_size __initdata = 0;
117 static char * __init visws_memory_setup(void)
119 long long gfx_mem_size = 8 * MB;
121 mem_size = boot_params.alt_mem_k;
124 printk(KERN_WARNING "Bootloader didn't set memory size, upgrade it !\n");
129 * this hardcodes the graphics memory to 8 MB
130 * it really should be sized dynamically (or at least
131 * set as a boot param)
133 if (!sgivwfb_mem_size) {
134 printk(KERN_WARNING "Defaulting to 8 MB framebuffer size\n");
135 sgivwfb_mem_size = 8 * MB;
141 sgivwfb_mem_size &= ~((1 << 20) - 1);
142 sgivwfb_mem_phys = mem_size - gfx_mem_size;
144 e820_add_region(0, LOWMEMSIZE(), E820_RAM);
145 e820_add_region(HIGH_MEMORY, mem_size - sgivwfb_mem_size - HIGH_MEMORY, E820_RAM);
146 e820_add_region(sgivwfb_mem_phys, sgivwfb_mem_size, E820_RESERVED);
151 static void visws_machine_emergency_restart(void)
154 * Visual Workstations restart after this
155 * register is poked on the PIIX4
157 outb(PIIX4_RESET_VAL, PIIX4_RESET_PORT);
160 static void visws_machine_power_off(void)
162 unsigned short pm_status;
163 /* extern unsigned int pci_bus0; */
165 while ((pm_status = inw(PMSTS_PORT)) & 0x100)
166 outw(pm_status, PMSTS_PORT);
168 outw(PM_SUSPEND_ENABLE, PMCNTRL_PORT);
172 #define PCI_CONF1_ADDRESS(bus, devfn, reg) \
173 (0x80000000 | (bus << 16) | (devfn << 8) | (reg & ~3))
175 /* outl(PCI_CONF1_ADDRESS(pci_bus0, SPECIAL_DEV, SPECIAL_REG), 0xCF8); */
176 outl(PIIX_SPECIAL_STOP, 0xCFC);
179 static int __init visws_get_smp_config(unsigned int early)
182 * Prevent MP-table parsing by the generic code:
187 extern unsigned int __cpuinitdata maxcpus;
190 * The Visual Workstation is Intel MP compliant in the hardware
191 * sense, but it doesn't have a BIOS(-configuration table).
192 * No problem for Linux.
195 static void __init MP_processor_info(struct mpc_config_processor *m)
197 int ver, logical_apicid;
198 physid_mask_t apic_cpus;
200 if (!(m->mpc_cpuflag & CPU_ENABLED))
203 logical_apicid = m->mpc_apicid;
204 printk(KERN_INFO "%sCPU #%d %u:%u APIC version %d\n",
205 m->mpc_cpuflag & CPU_BOOTPROCESSOR ? "Bootup " : "",
207 (m->mpc_cpufeature & CPU_FAMILY_MASK) >> 8,
208 (m->mpc_cpufeature & CPU_MODEL_MASK) >> 4,
211 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR)
212 boot_cpu_physical_apicid = m->mpc_apicid;
214 ver = m->mpc_apicver;
215 if ((ver >= 0x14 && m->mpc_apicid >= 0xff) || m->mpc_apicid >= 0xf) {
216 printk(KERN_ERR "Processor #%d INVALID. (Max ID: %d).\n",
217 m->mpc_apicid, MAX_APICS);
221 apic_cpus = apicid_to_cpu_present(m->mpc_apicid);
222 physids_or(phys_cpu_present_map, phys_cpu_present_map, apic_cpus);
227 printk(KERN_ERR "BIOS bug, APIC version is 0 for CPU#%d! "
228 "fixing up to 0x10. (tell your hw vendor)\n",
232 apic_version[m->mpc_apicid] = ver;
235 static int __init visws_find_smp_config(unsigned int reserve)
237 struct mpc_config_processor *mp = phys_to_virt(CO_CPU_TAB_PHYS);
238 unsigned short ncpus = readw(phys_to_virt(CO_CPU_NUM_PHYS));
240 if (ncpus > CO_CPU_MAX) {
241 printk(KERN_WARNING "find_visws_smp: got cpu count of %d at %p\n",
250 #ifdef CONFIG_X86_LOCAL_APIC
251 smp_found_config = 1;
254 MP_processor_info(mp++);
256 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
261 static int visws_trap_init(void);
263 static struct x86_quirks visws_x86_quirks __initdata = {
264 .arch_time_init = visws_time_init,
265 .arch_pre_intr_init = visws_pre_intr_init,
266 .arch_memory_setup = visws_memory_setup,
267 .arch_intr_init = NULL,
268 .arch_trap_init = visws_trap_init,
269 .mach_get_smp_config = visws_get_smp_config,
270 .mach_find_smp_config = visws_find_smp_config,
273 void __init visws_early_detect(void)
277 visws_board_type = (char)(inb_p(PIIX_GPI_BD_REG) & PIIX_GPI_BD_REG)
278 >> PIIX_GPI_BD_SHIFT;
280 if (visws_board_type < 0)
284 * Install special quirks for timer, interrupt and memory setup:
285 * Fall back to generic behavior for traps:
286 * Override generic MP-table parsing:
288 x86_quirks = &visws_x86_quirks;
291 * Install reboot quirks:
293 pm_power_off = visws_machine_power_off;
294 machine_ops.emergency_restart = visws_machine_emergency_restart;
297 * Do not use broadcast IPIs:
301 #ifdef CONFIG_X86_IO_APIC
303 * Turn off IO-APIC detection and initialization:
305 skip_ioapic_setup = 1;
310 * First, we have to initialize the 307 part to allow us access
311 * to the GPIO registers. Let's map them at 0x0fc0 which is right
312 * after the PIIX4 PM section.
314 outb_p(SIO_DEV_SEL, SIO_INDEX);
315 outb_p(SIO_GP_DEV, SIO_DATA); /* Talk to GPIO regs. */
317 outb_p(SIO_DEV_MSB, SIO_INDEX);
318 outb_p(SIO_GP_MSB, SIO_DATA); /* MSB of GPIO base address */
320 outb_p(SIO_DEV_LSB, SIO_INDEX);
321 outb_p(SIO_GP_LSB, SIO_DATA); /* LSB of GPIO base address */
323 outb_p(SIO_DEV_ENB, SIO_INDEX);
324 outb_p(1, SIO_DATA); /* Enable GPIO registers. */
327 * Now, we have to map the power management section to write
328 * a bit which enables access to the GPIO registers.
329 * What lunatic came up with this shit?
331 outb_p(SIO_DEV_SEL, SIO_INDEX);
332 outb_p(SIO_PM_DEV, SIO_DATA); /* Talk to GPIO regs. */
334 outb_p(SIO_DEV_MSB, SIO_INDEX);
335 outb_p(SIO_PM_MSB, SIO_DATA); /* MSB of PM base address */
337 outb_p(SIO_DEV_LSB, SIO_INDEX);
338 outb_p(SIO_PM_LSB, SIO_DATA); /* LSB of PM base address */
340 outb_p(SIO_DEV_ENB, SIO_INDEX);
341 outb_p(1, SIO_DATA); /* Enable PM registers. */
344 * Now, write the PM register which enables the GPIO registers.
346 outb_p(SIO_PM_FER2, SIO_PM_INDEX);
347 outb_p(SIO_PM_GP_EN, SIO_PM_DATA);
350 * Now, initialize the GPIO registers.
351 * We want them all to be inputs which is the
352 * power on default, so let's leave them alone.
353 * So, let's just read the board rev!
355 raw = inb_p(SIO_GP_DATA1);
356 raw &= 0x7f; /* 7 bits of valid board revision ID. */
358 if (visws_board_type == VISWS_320) {
361 } else if (raw < 0xc) {
366 } else if (visws_board_type == VISWS_540) {
369 visws_board_rev = raw;
372 printk(KERN_INFO "Silicon Graphics Visual Workstation %s (rev %d) detected\n",
373 (visws_board_type == VISWS_320 ? "320" :
374 (visws_board_type == VISWS_540 ? "540" :
375 "unknown")), visws_board_rev);
378 #define A01234 (LI_INTA_0 | LI_INTA_1 | LI_INTA_2 | LI_INTA_3 | LI_INTA_4)
379 #define BCD (LI_INTB | LI_INTC | LI_INTD)
380 #define ALLDEVS (A01234 | BCD)
382 static __init void lithium_init(void)
384 set_fixmap(FIX_LI_PCIA, LI_PCI_A_PHYS);
385 set_fixmap(FIX_LI_PCIB, LI_PCI_B_PHYS);
387 if ((li_pcia_read16(PCI_VENDOR_ID) != PCI_VENDOR_ID_SGI) ||
388 (li_pcia_read16(PCI_DEVICE_ID) != PCI_DEVICE_ID_SGI_LITHIUM)) {
389 printk(KERN_EMERG "Lithium hostbridge %c not found\n", 'A');
390 /* panic("This machine is not SGI Visual Workstation 320/540"); */
393 if ((li_pcib_read16(PCI_VENDOR_ID) != PCI_VENDOR_ID_SGI) ||
394 (li_pcib_read16(PCI_DEVICE_ID) != PCI_DEVICE_ID_SGI_LITHIUM)) {
395 printk(KERN_EMERG "Lithium hostbridge %c not found\n", 'B');
396 /* panic("This machine is not SGI Visual Workstation 320/540"); */
399 li_pcia_write16(LI_PCI_INTEN, ALLDEVS);
400 li_pcib_write16(LI_PCI_INTEN, ALLDEVS);
403 static __init void cobalt_init(void)
406 * On normal SMP PC this is used only with SMP, but we have to
407 * use it and set it up here to start the Cobalt clock
409 set_fixmap(FIX_APIC_BASE, APIC_DEFAULT_PHYS_BASE);
411 printk(KERN_INFO "Local APIC Version %#x, ID %#x\n",
412 (unsigned int)apic_read(APIC_LVR),
413 (unsigned int)apic_read(APIC_ID));
415 set_fixmap(FIX_CO_CPU, CO_CPU_PHYS);
416 set_fixmap(FIX_CO_APIC, CO_APIC_PHYS);
417 printk(KERN_INFO "Cobalt Revision %#lx, APIC ID %#lx\n",
418 co_cpu_read(CO_CPU_REV), co_apic_read(CO_APIC_ID));
420 /* Enable Cobalt APIC being careful to NOT change the ID! */
421 co_apic_write(CO_APIC_ID, co_apic_read(CO_APIC_ID) | CO_APIC_ENABLE);
423 printk(KERN_INFO "Cobalt APIC enabled: ID reg %#lx\n",
424 co_apic_read(CO_APIC_ID));
427 static int __init visws_trap_init(void)
436 * IRQ controller / APIC support:
439 static DEFINE_SPINLOCK(cobalt_lock);
442 * Set the given Cobalt APIC Redirection Table entry to point
443 * to the given IDT vector/index.
445 static inline void co_apic_set(int entry, int irq)
447 co_apic_write(CO_APIC_LO(entry), CO_APIC_LEVEL | (irq + FIRST_EXTERNAL_VECTOR));
448 co_apic_write(CO_APIC_HI(entry), 0);
452 * Cobalt (IO)-APIC functions to handle PCI devices.
454 static inline int co_apic_ide0_hack(void)
456 extern char visws_board_type;
457 extern char visws_board_rev;
459 if (visws_board_type == VISWS_320 && visws_board_rev == 5)
464 static int is_co_apic(unsigned int irq)
470 case 0: return CO_APIC_CPU;
471 case CO_IRQ_IDE0: return co_apic_ide0_hack();
472 case CO_IRQ_IDE1: return CO_APIC_IDE1;
479 * This is the SGI Cobalt (IO-)APIC:
482 static void enable_cobalt_irq(unsigned int irq)
484 co_apic_set(is_co_apic(irq), irq);
487 static void disable_cobalt_irq(unsigned int irq)
489 int entry = is_co_apic(irq);
491 co_apic_write(CO_APIC_LO(entry), CO_APIC_MASK);
492 co_apic_read(CO_APIC_LO(entry));
496 * "irq" really just serves to identify the device. Here is where we
497 * map this to the Cobalt APIC entry where it's physically wired.
498 * This is called via request_irq -> setup_irq -> irq_desc->startup()
500 static unsigned int startup_cobalt_irq(unsigned int irq)
504 spin_lock_irqsave(&cobalt_lock, flags);
505 if ((irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS | IRQ_WAITING)))
506 irq_desc[irq].status &= ~(IRQ_DISABLED | IRQ_INPROGRESS | IRQ_WAITING);
507 enable_cobalt_irq(irq);
508 spin_unlock_irqrestore(&cobalt_lock, flags);
512 static void ack_cobalt_irq(unsigned int irq)
516 spin_lock_irqsave(&cobalt_lock, flags);
517 disable_cobalt_irq(irq);
518 apic_write(APIC_EOI, APIC_EIO_ACK);
519 spin_unlock_irqrestore(&cobalt_lock, flags);
522 static void end_cobalt_irq(unsigned int irq)
526 spin_lock_irqsave(&cobalt_lock, flags);
527 if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
528 enable_cobalt_irq(irq);
529 spin_unlock_irqrestore(&cobalt_lock, flags);
532 static struct irq_chip cobalt_irq_type = {
533 .typename = "Cobalt-APIC",
534 .startup = startup_cobalt_irq,
535 .shutdown = disable_cobalt_irq,
536 .enable = enable_cobalt_irq,
537 .disable = disable_cobalt_irq,
538 .ack = ack_cobalt_irq,
539 .end = end_cobalt_irq,
544 * This is the PIIX4-based 8259 that is wired up indirectly to Cobalt
545 * -- not the manner expected by the code in i8259.c.
547 * there is a 'master' physical interrupt source that gets sent to
548 * the CPU. But in the chipset there are various 'virtual' interrupts
549 * waiting to be handled. We represent this to Linux through a 'master'
550 * interrupt controller type, and through a special virtual interrupt-
551 * controller. Device drivers only see the virtual interrupt sources.
553 static unsigned int startup_piix4_master_irq(unsigned int irq)
557 return startup_cobalt_irq(irq);
560 static void end_piix4_master_irq(unsigned int irq)
564 spin_lock_irqsave(&cobalt_lock, flags);
565 enable_cobalt_irq(irq);
566 spin_unlock_irqrestore(&cobalt_lock, flags);
569 static struct irq_chip piix4_master_irq_type = {
570 .typename = "PIIX4-master",
571 .startup = startup_piix4_master_irq,
572 .ack = ack_cobalt_irq,
573 .end = end_piix4_master_irq,
577 static struct irq_chip piix4_virtual_irq_type = {
578 .typename = "PIIX4-virtual",
579 .shutdown = disable_8259A_irq,
580 .enable = enable_8259A_irq,
581 .disable = disable_8259A_irq,
586 * PIIX4-8259 master/virtual functions to handle interrupt requests
587 * from legacy devices: floppy, parallel, serial, rtc.
589 * None of these get Cobalt APIC entries, neither do they have IDT
590 * entries. These interrupts are purely virtual and distributed from
591 * the 'master' interrupt source: CO_IRQ_8259.
593 * When the 8259 interrupts its handler figures out which of these
594 * devices is interrupting and dispatches to its handler.
596 * CAREFUL: devices see the 'virtual' interrupt only. Thus disable/
597 * enable_irq gets the right irq. This 'master' irq is never directly
598 * manipulated by any driver.
600 static irqreturn_t piix4_master_intr(int irq, void *dev_id)
606 spin_lock_irqsave(&i8259A_lock, flags);
608 /* Find out what's interrupting in the PIIX4 master 8259 */
609 outb(0x0c, 0x20); /* OCW3 Poll command */
613 * Bit 7 == 0 means invalid/spurious
615 if (unlikely(!(realirq & 0x80)))
620 if (unlikely(realirq == 2)) {
624 if (unlikely(!(realirq & 0x80)))
627 realirq = (realirq & 7) + 8;
630 /* mask and ack interrupt */
631 cached_irq_mask |= 1 << realirq;
632 if (unlikely(realirq > 7)) {
634 outb(cached_slave_mask, 0xa1);
635 outb(0x60 + (realirq & 7), 0xa0);
636 outb(0x60 + 2, 0x20);
639 outb(cached_master_mask, 0x21);
640 outb(0x60 + realirq, 0x20);
643 spin_unlock_irqrestore(&i8259A_lock, flags);
645 desc = irq_desc + realirq;
648 * handle this 'virtual interrupt' as a Cobalt one now.
650 kstat_cpu(smp_processor_id()).irqs[realirq]++;
652 if (likely(desc->action != NULL))
653 handle_IRQ_event(realirq, desc->action);
655 if (!(desc->status & IRQ_DISABLED))
656 enable_8259A_irq(realirq);
661 spin_unlock_irqrestore(&i8259A_lock, flags);
665 static struct irqaction master_action = {
666 .handler = piix4_master_intr,
667 .name = "PIIX4-8259",
670 static struct irqaction cascade_action = {
671 .handler = no_action,
676 void init_VISWS_APIC_irqs(void)
680 for (i = 0; i < CO_IRQ_APIC0 + CO_APIC_LAST + 1; i++) {
681 irq_desc[i].status = IRQ_DISABLED;
682 irq_desc[i].action = 0;
683 irq_desc[i].depth = 1;
686 irq_desc[i].chip = &cobalt_irq_type;
688 else if (i == CO_IRQ_IDE0) {
689 irq_desc[i].chip = &cobalt_irq_type;
691 else if (i == CO_IRQ_IDE1) {
692 irq_desc[i].chip = &cobalt_irq_type;
694 else if (i == CO_IRQ_8259) {
695 irq_desc[i].chip = &piix4_master_irq_type;
697 else if (i < CO_IRQ_APIC0) {
698 irq_desc[i].chip = &piix4_virtual_irq_type;
700 else if (IS_CO_APIC(i)) {
701 irq_desc[i].chip = &cobalt_irq_type;
705 setup_irq(CO_IRQ_8259, &master_action);
706 setup_irq(2, &cascade_action);