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:
188 * The Visual Workstation is Intel MP compliant in the hardware
189 * sense, but it doesn't have a BIOS(-configuration table).
190 * No problem for Linux.
193 static void __init MP_processor_info(struct mpc_config_processor *m)
195 int ver, logical_apicid;
196 physid_mask_t apic_cpus;
198 if (!(m->mpc_cpuflag & CPU_ENABLED))
201 logical_apicid = m->mpc_apicid;
202 printk(KERN_INFO "%sCPU #%d %u:%u APIC version %d\n",
203 m->mpc_cpuflag & CPU_BOOTPROCESSOR ? "Bootup " : "",
205 (m->mpc_cpufeature & CPU_FAMILY_MASK) >> 8,
206 (m->mpc_cpufeature & CPU_MODEL_MASK) >> 4,
209 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR)
210 boot_cpu_physical_apicid = m->mpc_apicid;
212 ver = m->mpc_apicver;
213 if ((ver >= 0x14 && m->mpc_apicid >= 0xff) || m->mpc_apicid >= 0xf) {
214 printk(KERN_ERR "Processor #%d INVALID. (Max ID: %d).\n",
215 m->mpc_apicid, MAX_APICS);
219 apic_cpus = apicid_to_cpu_present(m->mpc_apicid);
220 physids_or(phys_cpu_present_map, phys_cpu_present_map, apic_cpus);
225 printk(KERN_ERR "BIOS bug, APIC version is 0 for CPU#%d! "
226 "fixing up to 0x10. (tell your hw vendor)\n",
230 apic_version[m->mpc_apicid] = ver;
233 static int __init visws_find_smp_config(unsigned int reserve)
235 struct mpc_config_processor *mp = phys_to_virt(CO_CPU_TAB_PHYS);
236 unsigned short ncpus = readw(phys_to_virt(CO_CPU_NUM_PHYS));
238 if (ncpus > CO_CPU_MAX) {
239 printk(KERN_WARNING "find_visws_smp: got cpu count of %d at %p\n",
245 if (ncpus > setup_max_cpus)
246 ncpus = setup_max_cpus;
248 #ifdef CONFIG_X86_LOCAL_APIC
249 smp_found_config = 1;
252 MP_processor_info(mp++);
254 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
259 static int visws_trap_init(void);
261 static struct x86_quirks visws_x86_quirks __initdata = {
262 .arch_time_init = visws_time_init,
263 .arch_pre_intr_init = visws_pre_intr_init,
264 .arch_memory_setup = visws_memory_setup,
265 .arch_intr_init = NULL,
266 .arch_trap_init = visws_trap_init,
267 .mach_get_smp_config = visws_get_smp_config,
268 .mach_find_smp_config = visws_find_smp_config,
271 void __init visws_early_detect(void)
275 visws_board_type = (char)(inb_p(PIIX_GPI_BD_REG) & PIIX_GPI_BD_REG)
276 >> PIIX_GPI_BD_SHIFT;
278 if (visws_board_type < 0)
282 * Install special quirks for timer, interrupt and memory setup:
283 * Fall back to generic behavior for traps:
284 * Override generic MP-table parsing:
286 x86_quirks = &visws_x86_quirks;
289 * Install reboot quirks:
291 pm_power_off = visws_machine_power_off;
292 machine_ops.emergency_restart = visws_machine_emergency_restart;
295 * Do not use broadcast IPIs:
299 #ifdef CONFIG_X86_IO_APIC
301 * Turn off IO-APIC detection and initialization:
303 skip_ioapic_setup = 1;
308 * First, we have to initialize the 307 part to allow us access
309 * to the GPIO registers. Let's map them at 0x0fc0 which is right
310 * after the PIIX4 PM section.
312 outb_p(SIO_DEV_SEL, SIO_INDEX);
313 outb_p(SIO_GP_DEV, SIO_DATA); /* Talk to GPIO regs. */
315 outb_p(SIO_DEV_MSB, SIO_INDEX);
316 outb_p(SIO_GP_MSB, SIO_DATA); /* MSB of GPIO base address */
318 outb_p(SIO_DEV_LSB, SIO_INDEX);
319 outb_p(SIO_GP_LSB, SIO_DATA); /* LSB of GPIO base address */
321 outb_p(SIO_DEV_ENB, SIO_INDEX);
322 outb_p(1, SIO_DATA); /* Enable GPIO registers. */
325 * Now, we have to map the power management section to write
326 * a bit which enables access to the GPIO registers.
327 * What lunatic came up with this shit?
329 outb_p(SIO_DEV_SEL, SIO_INDEX);
330 outb_p(SIO_PM_DEV, SIO_DATA); /* Talk to GPIO regs. */
332 outb_p(SIO_DEV_MSB, SIO_INDEX);
333 outb_p(SIO_PM_MSB, SIO_DATA); /* MSB of PM base address */
335 outb_p(SIO_DEV_LSB, SIO_INDEX);
336 outb_p(SIO_PM_LSB, SIO_DATA); /* LSB of PM base address */
338 outb_p(SIO_DEV_ENB, SIO_INDEX);
339 outb_p(1, SIO_DATA); /* Enable PM registers. */
342 * Now, write the PM register which enables the GPIO registers.
344 outb_p(SIO_PM_FER2, SIO_PM_INDEX);
345 outb_p(SIO_PM_GP_EN, SIO_PM_DATA);
348 * Now, initialize the GPIO registers.
349 * We want them all to be inputs which is the
350 * power on default, so let's leave them alone.
351 * So, let's just read the board rev!
353 raw = inb_p(SIO_GP_DATA1);
354 raw &= 0x7f; /* 7 bits of valid board revision ID. */
356 if (visws_board_type == VISWS_320) {
359 } else if (raw < 0xc) {
364 } else if (visws_board_type == VISWS_540) {
367 visws_board_rev = raw;
370 printk(KERN_INFO "Silicon Graphics Visual Workstation %s (rev %d) detected\n",
371 (visws_board_type == VISWS_320 ? "320" :
372 (visws_board_type == VISWS_540 ? "540" :
373 "unknown")), visws_board_rev);
376 #define A01234 (LI_INTA_0 | LI_INTA_1 | LI_INTA_2 | LI_INTA_3 | LI_INTA_4)
377 #define BCD (LI_INTB | LI_INTC | LI_INTD)
378 #define ALLDEVS (A01234 | BCD)
380 static __init void lithium_init(void)
382 set_fixmap(FIX_LI_PCIA, LI_PCI_A_PHYS);
383 set_fixmap(FIX_LI_PCIB, LI_PCI_B_PHYS);
385 if ((li_pcia_read16(PCI_VENDOR_ID) != PCI_VENDOR_ID_SGI) ||
386 (li_pcia_read16(PCI_DEVICE_ID) != PCI_DEVICE_ID_SGI_LITHIUM)) {
387 printk(KERN_EMERG "Lithium hostbridge %c not found\n", 'A');
388 /* panic("This machine is not SGI Visual Workstation 320/540"); */
391 if ((li_pcib_read16(PCI_VENDOR_ID) != PCI_VENDOR_ID_SGI) ||
392 (li_pcib_read16(PCI_DEVICE_ID) != PCI_DEVICE_ID_SGI_LITHIUM)) {
393 printk(KERN_EMERG "Lithium hostbridge %c not found\n", 'B');
394 /* panic("This machine is not SGI Visual Workstation 320/540"); */
397 li_pcia_write16(LI_PCI_INTEN, ALLDEVS);
398 li_pcib_write16(LI_PCI_INTEN, ALLDEVS);
401 static __init void cobalt_init(void)
404 * On normal SMP PC this is used only with SMP, but we have to
405 * use it and set it up here to start the Cobalt clock
407 set_fixmap(FIX_APIC_BASE, APIC_DEFAULT_PHYS_BASE);
409 printk(KERN_INFO "Local APIC Version %#x, ID %#x\n",
410 (unsigned int)apic_read(APIC_LVR),
411 (unsigned int)apic_read(APIC_ID));
413 set_fixmap(FIX_CO_CPU, CO_CPU_PHYS);
414 set_fixmap(FIX_CO_APIC, CO_APIC_PHYS);
415 printk(KERN_INFO "Cobalt Revision %#lx, APIC ID %#lx\n",
416 co_cpu_read(CO_CPU_REV), co_apic_read(CO_APIC_ID));
418 /* Enable Cobalt APIC being careful to NOT change the ID! */
419 co_apic_write(CO_APIC_ID, co_apic_read(CO_APIC_ID) | CO_APIC_ENABLE);
421 printk(KERN_INFO "Cobalt APIC enabled: ID reg %#lx\n",
422 co_apic_read(CO_APIC_ID));
425 static int __init visws_trap_init(void)
434 * IRQ controller / APIC support:
437 static DEFINE_SPINLOCK(cobalt_lock);
440 * Set the given Cobalt APIC Redirection Table entry to point
441 * to the given IDT vector/index.
443 static inline void co_apic_set(int entry, int irq)
445 co_apic_write(CO_APIC_LO(entry), CO_APIC_LEVEL | (irq + FIRST_EXTERNAL_VECTOR));
446 co_apic_write(CO_APIC_HI(entry), 0);
450 * Cobalt (IO)-APIC functions to handle PCI devices.
452 static inline int co_apic_ide0_hack(void)
454 extern char visws_board_type;
455 extern char visws_board_rev;
457 if (visws_board_type == VISWS_320 && visws_board_rev == 5)
462 static int is_co_apic(unsigned int irq)
468 case 0: return CO_APIC_CPU;
469 case CO_IRQ_IDE0: return co_apic_ide0_hack();
470 case CO_IRQ_IDE1: return CO_APIC_IDE1;
477 * This is the SGI Cobalt (IO-)APIC:
480 static void enable_cobalt_irq(unsigned int irq)
482 co_apic_set(is_co_apic(irq), irq);
485 static void disable_cobalt_irq(unsigned int irq)
487 int entry = is_co_apic(irq);
489 co_apic_write(CO_APIC_LO(entry), CO_APIC_MASK);
490 co_apic_read(CO_APIC_LO(entry));
494 * "irq" really just serves to identify the device. Here is where we
495 * map this to the Cobalt APIC entry where it's physically wired.
496 * This is called via request_irq -> setup_irq -> irq_desc->startup()
498 static unsigned int startup_cobalt_irq(unsigned int irq)
502 spin_lock_irqsave(&cobalt_lock, flags);
503 if ((irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS | IRQ_WAITING)))
504 irq_desc[irq].status &= ~(IRQ_DISABLED | IRQ_INPROGRESS | IRQ_WAITING);
505 enable_cobalt_irq(irq);
506 spin_unlock_irqrestore(&cobalt_lock, flags);
510 static void ack_cobalt_irq(unsigned int irq)
514 spin_lock_irqsave(&cobalt_lock, flags);
515 disable_cobalt_irq(irq);
516 apic_write(APIC_EOI, APIC_EIO_ACK);
517 spin_unlock_irqrestore(&cobalt_lock, flags);
520 static void end_cobalt_irq(unsigned int irq)
524 spin_lock_irqsave(&cobalt_lock, flags);
525 if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
526 enable_cobalt_irq(irq);
527 spin_unlock_irqrestore(&cobalt_lock, flags);
530 static struct irq_chip cobalt_irq_type = {
531 .typename = "Cobalt-APIC",
532 .startup = startup_cobalt_irq,
533 .shutdown = disable_cobalt_irq,
534 .enable = enable_cobalt_irq,
535 .disable = disable_cobalt_irq,
536 .ack = ack_cobalt_irq,
537 .end = end_cobalt_irq,
542 * This is the PIIX4-based 8259 that is wired up indirectly to Cobalt
543 * -- not the manner expected by the code in i8259.c.
545 * there is a 'master' physical interrupt source that gets sent to
546 * the CPU. But in the chipset there are various 'virtual' interrupts
547 * waiting to be handled. We represent this to Linux through a 'master'
548 * interrupt controller type, and through a special virtual interrupt-
549 * controller. Device drivers only see the virtual interrupt sources.
551 static unsigned int startup_piix4_master_irq(unsigned int irq)
555 return startup_cobalt_irq(irq);
558 static void end_piix4_master_irq(unsigned int irq)
562 spin_lock_irqsave(&cobalt_lock, flags);
563 enable_cobalt_irq(irq);
564 spin_unlock_irqrestore(&cobalt_lock, flags);
567 static struct irq_chip piix4_master_irq_type = {
568 .typename = "PIIX4-master",
569 .startup = startup_piix4_master_irq,
570 .ack = ack_cobalt_irq,
571 .end = end_piix4_master_irq,
575 static struct irq_chip piix4_virtual_irq_type = {
576 .typename = "PIIX4-virtual",
577 .shutdown = disable_8259A_irq,
578 .enable = enable_8259A_irq,
579 .disable = disable_8259A_irq,
584 * PIIX4-8259 master/virtual functions to handle interrupt requests
585 * from legacy devices: floppy, parallel, serial, rtc.
587 * None of these get Cobalt APIC entries, neither do they have IDT
588 * entries. These interrupts are purely virtual and distributed from
589 * the 'master' interrupt source: CO_IRQ_8259.
591 * When the 8259 interrupts its handler figures out which of these
592 * devices is interrupting and dispatches to its handler.
594 * CAREFUL: devices see the 'virtual' interrupt only. Thus disable/
595 * enable_irq gets the right irq. This 'master' irq is never directly
596 * manipulated by any driver.
598 static irqreturn_t piix4_master_intr(int irq, void *dev_id)
604 spin_lock_irqsave(&i8259A_lock, flags);
606 /* Find out what's interrupting in the PIIX4 master 8259 */
607 outb(0x0c, 0x20); /* OCW3 Poll command */
611 * Bit 7 == 0 means invalid/spurious
613 if (unlikely(!(realirq & 0x80)))
618 if (unlikely(realirq == 2)) {
622 if (unlikely(!(realirq & 0x80)))
625 realirq = (realirq & 7) + 8;
628 /* mask and ack interrupt */
629 cached_irq_mask |= 1 << realirq;
630 if (unlikely(realirq > 7)) {
632 outb(cached_slave_mask, 0xa1);
633 outb(0x60 + (realirq & 7), 0xa0);
634 outb(0x60 + 2, 0x20);
637 outb(cached_master_mask, 0x21);
638 outb(0x60 + realirq, 0x20);
641 spin_unlock_irqrestore(&i8259A_lock, flags);
643 desc = irq_desc + realirq;
646 * handle this 'virtual interrupt' as a Cobalt one now.
648 kstat_cpu(smp_processor_id()).irqs[realirq]++;
650 if (likely(desc->action != NULL))
651 handle_IRQ_event(realirq, desc->action);
653 if (!(desc->status & IRQ_DISABLED))
654 enable_8259A_irq(realirq);
659 spin_unlock_irqrestore(&i8259A_lock, flags);
663 static struct irqaction master_action = {
664 .handler = piix4_master_intr,
665 .name = "PIIX4-8259",
668 static struct irqaction cascade_action = {
669 .handler = no_action,
674 void init_VISWS_APIC_irqs(void)
678 for (i = 0; i < CO_IRQ_APIC0 + CO_APIC_LAST + 1; i++) {
679 irq_desc[i].status = IRQ_DISABLED;
680 irq_desc[i].action = 0;
681 irq_desc[i].depth = 1;
684 irq_desc[i].chip = &cobalt_irq_type;
686 else if (i == CO_IRQ_IDE0) {
687 irq_desc[i].chip = &cobalt_irq_type;
689 else if (i == CO_IRQ_IDE1) {
690 irq_desc[i].chip = &cobalt_irq_type;
692 else if (i == CO_IRQ_8259) {
693 irq_desc[i].chip = &piix4_master_irq_type;
695 else if (i < CO_IRQ_APIC0) {
696 irq_desc[i].chip = &piix4_virtual_irq_type;
698 else if (IS_CO_APIC(i)) {
699 irq_desc[i].chip = &cobalt_irq_type;
703 setup_irq(CO_IRQ_8259, &master_action);
704 setup_irq(2, &cascade_action);