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/io_apic.h>
29 #include <asm/fixmap.h>
30 #include <asm/reboot.h>
31 #include <asm/setup.h>
37 #include "mach_apic.h"
39 #include <linux/kernel_stat.h>
41 #include <asm/i8259.h>
42 #include <asm/irq_vectors.h>
43 #include <asm/visws/lithium.h>
45 #include <linux/sched.h>
46 #include <linux/kernel.h>
47 #include <linux/pci.h>
48 #include <linux/pci_ids.h>
50 extern int no_broadcast;
54 char visws_board_type = -1;
55 char visws_board_rev = -1;
57 int is_visws_box(void)
59 return visws_board_type >= 0;
62 static int __init visws_time_init(void)
64 printk(KERN_INFO "Starting Cobalt Timer system clock\n");
66 /* Set the countdown value */
67 co_cpu_write(CO_CPU_TIMEVAL, CO_TIME_HZ/HZ);
70 co_cpu_write(CO_CPU_CTRL, co_cpu_read(CO_CPU_CTRL) | CO_CTRL_TIMERUN);
72 /* Enable (unmask) the timer interrupt */
73 co_cpu_write(CO_CPU_CTRL, co_cpu_read(CO_CPU_CTRL) & ~CO_CTRL_TIMEMASK);
76 * Zero return means the generic timer setup code will set up
77 * the standard vector:
82 static int __init visws_pre_intr_init(void)
84 init_VISWS_APIC_irqs();
87 * We dont want ISA irqs to be set up by the generic code:
92 /* Quirk for machine specific memory setup. */
94 #define MB (1024 * 1024)
96 unsigned long sgivwfb_mem_phys;
97 unsigned long sgivwfb_mem_size;
98 EXPORT_SYMBOL(sgivwfb_mem_phys);
99 EXPORT_SYMBOL(sgivwfb_mem_size);
101 long long mem_size __initdata = 0;
103 static char * __init visws_memory_setup(void)
105 long long gfx_mem_size = 8 * MB;
107 mem_size = boot_params.alt_mem_k;
110 printk(KERN_WARNING "Bootloader didn't set memory size, upgrade it !\n");
115 * this hardcodes the graphics memory to 8 MB
116 * it really should be sized dynamically (or at least
117 * set as a boot param)
119 if (!sgivwfb_mem_size) {
120 printk(KERN_WARNING "Defaulting to 8 MB framebuffer size\n");
121 sgivwfb_mem_size = 8 * MB;
127 sgivwfb_mem_size &= ~((1 << 20) - 1);
128 sgivwfb_mem_phys = mem_size - gfx_mem_size;
130 e820_add_region(0, LOWMEMSIZE(), E820_RAM);
131 e820_add_region(HIGH_MEMORY, mem_size - sgivwfb_mem_size - HIGH_MEMORY, E820_RAM);
132 e820_add_region(sgivwfb_mem_phys, sgivwfb_mem_size, E820_RESERVED);
137 static void visws_machine_emergency_restart(void)
140 * Visual Workstations restart after this
141 * register is poked on the PIIX4
143 outb(PIIX4_RESET_VAL, PIIX4_RESET_PORT);
146 static void visws_machine_power_off(void)
148 unsigned short pm_status;
149 /* extern unsigned int pci_bus0; */
151 while ((pm_status = inw(PMSTS_PORT)) & 0x100)
152 outw(pm_status, PMSTS_PORT);
154 outw(PM_SUSPEND_ENABLE, PMCNTRL_PORT);
158 #define PCI_CONF1_ADDRESS(bus, devfn, reg) \
159 (0x80000000 | (bus << 16) | (devfn << 8) | (reg & ~3))
161 /* outl(PCI_CONF1_ADDRESS(pci_bus0, SPECIAL_DEV, SPECIAL_REG), 0xCF8); */
162 outl(PIIX_SPECIAL_STOP, 0xCFC);
165 static int __init visws_get_smp_config(unsigned int early)
168 * Prevent MP-table parsing by the generic code:
174 * The Visual Workstation is Intel MP compliant in the hardware
175 * sense, but it doesn't have a BIOS(-configuration table).
176 * No problem for Linux.
179 static void __init MP_processor_info(struct mpc_config_processor *m)
181 int ver, logical_apicid;
182 physid_mask_t apic_cpus;
184 if (!(m->mpc_cpuflag & CPU_ENABLED))
187 logical_apicid = m->mpc_apicid;
188 printk(KERN_INFO "%sCPU #%d %u:%u APIC version %d\n",
189 m->mpc_cpuflag & CPU_BOOTPROCESSOR ? "Bootup " : "",
191 (m->mpc_cpufeature & CPU_FAMILY_MASK) >> 8,
192 (m->mpc_cpufeature & CPU_MODEL_MASK) >> 4,
195 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR)
196 boot_cpu_physical_apicid = m->mpc_apicid;
198 ver = m->mpc_apicver;
199 if ((ver >= 0x14 && m->mpc_apicid >= 0xff) || m->mpc_apicid >= 0xf) {
200 printk(KERN_ERR "Processor #%d INVALID. (Max ID: %d).\n",
201 m->mpc_apicid, MAX_APICS);
205 apic_cpus = apicid_to_cpu_present(m->mpc_apicid);
206 physids_or(phys_cpu_present_map, phys_cpu_present_map, apic_cpus);
211 printk(KERN_ERR "BIOS bug, APIC version is 0 for CPU#%d! "
212 "fixing up to 0x10. (tell your hw vendor)\n",
216 apic_version[m->mpc_apicid] = ver;
219 static int __init visws_find_smp_config(unsigned int reserve)
221 struct mpc_config_processor *mp = phys_to_virt(CO_CPU_TAB_PHYS);
222 unsigned short ncpus = readw(phys_to_virt(CO_CPU_NUM_PHYS));
224 if (ncpus > CO_CPU_MAX) {
225 printk(KERN_WARNING "find_visws_smp: got cpu count of %d at %p\n",
231 if (ncpus > setup_max_cpus)
232 ncpus = setup_max_cpus;
234 #ifdef CONFIG_X86_LOCAL_APIC
235 smp_found_config = 1;
238 MP_processor_info(mp++);
240 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
245 static int visws_trap_init(void);
247 static struct x86_quirks visws_x86_quirks __initdata = {
248 .arch_time_init = visws_time_init,
249 .arch_pre_intr_init = visws_pre_intr_init,
250 .arch_memory_setup = visws_memory_setup,
251 .arch_intr_init = NULL,
252 .arch_trap_init = visws_trap_init,
253 .mach_get_smp_config = visws_get_smp_config,
254 .mach_find_smp_config = visws_find_smp_config,
257 void __init visws_early_detect(void)
261 visws_board_type = (char)(inb_p(PIIX_GPI_BD_REG) & PIIX_GPI_BD_REG)
262 >> PIIX_GPI_BD_SHIFT;
264 if (visws_board_type < 0)
268 * Install special quirks for timer, interrupt and memory setup:
269 * Fall back to generic behavior for traps:
270 * Override generic MP-table parsing:
272 x86_quirks = &visws_x86_quirks;
275 * Install reboot quirks:
277 pm_power_off = visws_machine_power_off;
278 machine_ops.emergency_restart = visws_machine_emergency_restart;
281 * Do not use broadcast IPIs:
285 #ifdef CONFIG_X86_IO_APIC
287 * Turn off IO-APIC detection and initialization:
289 skip_ioapic_setup = 1;
294 * First, we have to initialize the 307 part to allow us access
295 * to the GPIO registers. Let's map them at 0x0fc0 which is right
296 * after the PIIX4 PM section.
298 outb_p(SIO_DEV_SEL, SIO_INDEX);
299 outb_p(SIO_GP_DEV, SIO_DATA); /* Talk to GPIO regs. */
301 outb_p(SIO_DEV_MSB, SIO_INDEX);
302 outb_p(SIO_GP_MSB, SIO_DATA); /* MSB of GPIO base address */
304 outb_p(SIO_DEV_LSB, SIO_INDEX);
305 outb_p(SIO_GP_LSB, SIO_DATA); /* LSB of GPIO base address */
307 outb_p(SIO_DEV_ENB, SIO_INDEX);
308 outb_p(1, SIO_DATA); /* Enable GPIO registers. */
311 * Now, we have to map the power management section to write
312 * a bit which enables access to the GPIO registers.
313 * What lunatic came up with this shit?
315 outb_p(SIO_DEV_SEL, SIO_INDEX);
316 outb_p(SIO_PM_DEV, SIO_DATA); /* Talk to GPIO regs. */
318 outb_p(SIO_DEV_MSB, SIO_INDEX);
319 outb_p(SIO_PM_MSB, SIO_DATA); /* MSB of PM base address */
321 outb_p(SIO_DEV_LSB, SIO_INDEX);
322 outb_p(SIO_PM_LSB, SIO_DATA); /* LSB of PM base address */
324 outb_p(SIO_DEV_ENB, SIO_INDEX);
325 outb_p(1, SIO_DATA); /* Enable PM registers. */
328 * Now, write the PM register which enables the GPIO registers.
330 outb_p(SIO_PM_FER2, SIO_PM_INDEX);
331 outb_p(SIO_PM_GP_EN, SIO_PM_DATA);
334 * Now, initialize the GPIO registers.
335 * We want them all to be inputs which is the
336 * power on default, so let's leave them alone.
337 * So, let's just read the board rev!
339 raw = inb_p(SIO_GP_DATA1);
340 raw &= 0x7f; /* 7 bits of valid board revision ID. */
342 if (visws_board_type == VISWS_320) {
345 } else if (raw < 0xc) {
350 } else if (visws_board_type == VISWS_540) {
353 visws_board_rev = raw;
356 printk(KERN_INFO "Silicon Graphics Visual Workstation %s (rev %d) detected\n",
357 (visws_board_type == VISWS_320 ? "320" :
358 (visws_board_type == VISWS_540 ? "540" :
359 "unknown")), visws_board_rev);
362 #define A01234 (LI_INTA_0 | LI_INTA_1 | LI_INTA_2 | LI_INTA_3 | LI_INTA_4)
363 #define BCD (LI_INTB | LI_INTC | LI_INTD)
364 #define ALLDEVS (A01234 | BCD)
366 static __init void lithium_init(void)
368 set_fixmap(FIX_LI_PCIA, LI_PCI_A_PHYS);
369 set_fixmap(FIX_LI_PCIB, LI_PCI_B_PHYS);
371 if ((li_pcia_read16(PCI_VENDOR_ID) != PCI_VENDOR_ID_SGI) ||
372 (li_pcia_read16(PCI_DEVICE_ID) != PCI_DEVICE_ID_SGI_LITHIUM)) {
373 printk(KERN_EMERG "Lithium hostbridge %c not found\n", 'A');
374 /* panic("This machine is not SGI Visual Workstation 320/540"); */
377 if ((li_pcib_read16(PCI_VENDOR_ID) != PCI_VENDOR_ID_SGI) ||
378 (li_pcib_read16(PCI_DEVICE_ID) != PCI_DEVICE_ID_SGI_LITHIUM)) {
379 printk(KERN_EMERG "Lithium hostbridge %c not found\n", 'B');
380 /* panic("This machine is not SGI Visual Workstation 320/540"); */
383 li_pcia_write16(LI_PCI_INTEN, ALLDEVS);
384 li_pcib_write16(LI_PCI_INTEN, ALLDEVS);
387 static __init void cobalt_init(void)
390 * On normal SMP PC this is used only with SMP, but we have to
391 * use it and set it up here to start the Cobalt clock
393 set_fixmap(FIX_APIC_BASE, APIC_DEFAULT_PHYS_BASE);
395 printk(KERN_INFO "Local APIC Version %#x, ID %#x\n",
396 (unsigned int)apic_read(APIC_LVR),
397 (unsigned int)apic_read(APIC_ID));
399 set_fixmap(FIX_CO_CPU, CO_CPU_PHYS);
400 set_fixmap(FIX_CO_APIC, CO_APIC_PHYS);
401 printk(KERN_INFO "Cobalt Revision %#lx, APIC ID %#lx\n",
402 co_cpu_read(CO_CPU_REV), co_apic_read(CO_APIC_ID));
404 /* Enable Cobalt APIC being careful to NOT change the ID! */
405 co_apic_write(CO_APIC_ID, co_apic_read(CO_APIC_ID) | CO_APIC_ENABLE);
407 printk(KERN_INFO "Cobalt APIC enabled: ID reg %#lx\n",
408 co_apic_read(CO_APIC_ID));
411 static int __init visws_trap_init(void)
420 * IRQ controller / APIC support:
423 static DEFINE_SPINLOCK(cobalt_lock);
426 * Set the given Cobalt APIC Redirection Table entry to point
427 * to the given IDT vector/index.
429 static inline void co_apic_set(int entry, int irq)
431 co_apic_write(CO_APIC_LO(entry), CO_APIC_LEVEL | (irq + FIRST_EXTERNAL_VECTOR));
432 co_apic_write(CO_APIC_HI(entry), 0);
436 * Cobalt (IO)-APIC functions to handle PCI devices.
438 static inline int co_apic_ide0_hack(void)
440 extern char visws_board_type;
441 extern char visws_board_rev;
443 if (visws_board_type == VISWS_320 && visws_board_rev == 5)
448 static int is_co_apic(unsigned int irq)
454 case 0: return CO_APIC_CPU;
455 case CO_IRQ_IDE0: return co_apic_ide0_hack();
456 case CO_IRQ_IDE1: return CO_APIC_IDE1;
463 * This is the SGI Cobalt (IO-)APIC:
466 static void enable_cobalt_irq(unsigned int irq)
468 co_apic_set(is_co_apic(irq), irq);
471 static void disable_cobalt_irq(unsigned int irq)
473 int entry = is_co_apic(irq);
475 co_apic_write(CO_APIC_LO(entry), CO_APIC_MASK);
476 co_apic_read(CO_APIC_LO(entry));
480 * "irq" really just serves to identify the device. Here is where we
481 * map this to the Cobalt APIC entry where it's physically wired.
482 * This is called via request_irq -> setup_irq -> irq_desc->startup()
484 static unsigned int startup_cobalt_irq(unsigned int irq)
487 struct irq_desc *desc = irq_to_desc(irq);
489 spin_lock_irqsave(&cobalt_lock, flags);
490 if ((desc->status & (IRQ_DISABLED | IRQ_INPROGRESS | IRQ_WAITING)))
491 desc->status &= ~(IRQ_DISABLED | IRQ_INPROGRESS | IRQ_WAITING);
492 enable_cobalt_irq(irq);
493 spin_unlock_irqrestore(&cobalt_lock, flags);
497 static void ack_cobalt_irq(unsigned int irq)
501 spin_lock_irqsave(&cobalt_lock, flags);
502 disable_cobalt_irq(irq);
503 apic_write(APIC_EOI, APIC_EIO_ACK);
504 spin_unlock_irqrestore(&cobalt_lock, flags);
507 static void end_cobalt_irq(unsigned int irq)
510 struct irq_desc *desc = irq_to_desc(irq);
512 spin_lock_irqsave(&cobalt_lock, flags);
513 if (!(desc->status & (IRQ_DISABLED | IRQ_INPROGRESS)))
514 enable_cobalt_irq(irq);
515 spin_unlock_irqrestore(&cobalt_lock, flags);
518 static struct irq_chip cobalt_irq_type = {
519 .typename = "Cobalt-APIC",
520 .startup = startup_cobalt_irq,
521 .shutdown = disable_cobalt_irq,
522 .enable = enable_cobalt_irq,
523 .disable = disable_cobalt_irq,
524 .ack = ack_cobalt_irq,
525 .end = end_cobalt_irq,
530 * This is the PIIX4-based 8259 that is wired up indirectly to Cobalt
531 * -- not the manner expected by the code in i8259.c.
533 * there is a 'master' physical interrupt source that gets sent to
534 * the CPU. But in the chipset there are various 'virtual' interrupts
535 * waiting to be handled. We represent this to Linux through a 'master'
536 * interrupt controller type, and through a special virtual interrupt-
537 * controller. Device drivers only see the virtual interrupt sources.
539 static unsigned int startup_piix4_master_irq(unsigned int irq)
543 return startup_cobalt_irq(irq);
546 static void end_piix4_master_irq(unsigned int irq)
550 spin_lock_irqsave(&cobalt_lock, flags);
551 enable_cobalt_irq(irq);
552 spin_unlock_irqrestore(&cobalt_lock, flags);
555 static struct irq_chip piix4_master_irq_type = {
556 .typename = "PIIX4-master",
557 .startup = startup_piix4_master_irq,
558 .ack = ack_cobalt_irq,
559 .end = end_piix4_master_irq,
563 static struct irq_chip piix4_virtual_irq_type = {
564 .typename = "PIIX4-virtual",
565 .shutdown = disable_8259A_irq,
566 .enable = enable_8259A_irq,
567 .disable = disable_8259A_irq,
572 * PIIX4-8259 master/virtual functions to handle interrupt requests
573 * from legacy devices: floppy, parallel, serial, rtc.
575 * None of these get Cobalt APIC entries, neither do they have IDT
576 * entries. These interrupts are purely virtual and distributed from
577 * the 'master' interrupt source: CO_IRQ_8259.
579 * When the 8259 interrupts its handler figures out which of these
580 * devices is interrupting and dispatches to its handler.
582 * CAREFUL: devices see the 'virtual' interrupt only. Thus disable/
583 * enable_irq gets the right irq. This 'master' irq is never directly
584 * manipulated by any driver.
586 static irqreturn_t piix4_master_intr(int irq, void *dev_id)
592 spin_lock_irqsave(&i8259A_lock, flags);
594 /* Find out what's interrupting in the PIIX4 master 8259 */
595 outb(0x0c, 0x20); /* OCW3 Poll command */
599 * Bit 7 == 0 means invalid/spurious
601 if (unlikely(!(realirq & 0x80)))
606 if (unlikely(realirq == 2)) {
610 if (unlikely(!(realirq & 0x80)))
613 realirq = (realirq & 7) + 8;
616 /* mask and ack interrupt */
617 cached_irq_mask |= 1 << realirq;
618 if (unlikely(realirq > 7)) {
620 outb(cached_slave_mask, 0xa1);
621 outb(0x60 + (realirq & 7), 0xa0);
622 outb(0x60 + 2, 0x20);
625 outb(cached_master_mask, 0x21);
626 outb(0x60 + realirq, 0x20);
629 spin_unlock_irqrestore(&i8259A_lock, flags);
631 desc = irq_to_desc(realirq);
634 * handle this 'virtual interrupt' as a Cobalt one now.
636 kstat_incr_irqs_this_cpu(realirq, desc);
638 if (likely(desc->action != NULL))
639 handle_IRQ_event(realirq, desc->action);
641 if (!(desc->status & IRQ_DISABLED))
642 enable_8259A_irq(realirq);
647 spin_unlock_irqrestore(&i8259A_lock, flags);
651 static struct irqaction master_action = {
652 .handler = piix4_master_intr,
653 .name = "PIIX4-8259",
656 static struct irqaction cascade_action = {
657 .handler = no_action,
662 void init_VISWS_APIC_irqs(void)
666 for (i = 0; i < CO_IRQ_APIC0 + CO_APIC_LAST + 1; i++) {
667 struct irq_desc *desc = irq_to_desc(i);
669 desc->status = IRQ_DISABLED;
674 desc->chip = &cobalt_irq_type;
676 else if (i == CO_IRQ_IDE0) {
677 desc->chip = &cobalt_irq_type;
679 else if (i == CO_IRQ_IDE1) {
680 desc->chip = &cobalt_irq_type;
682 else if (i == CO_IRQ_8259) {
683 desc->chip = &piix4_master_irq_type;
685 else if (i < CO_IRQ_APIC0) {
686 desc->chip = &piix4_virtual_irq_type;
688 else if (IS_CO_APIC(i)) {
689 desc->chip = &cobalt_irq_type;
693 setup_irq(CO_IRQ_8259, &master_action);
694 setup_irq(2, &cascade_action);