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>
36 #include "mach_apic.h"
38 #include <linux/kernel_stat.h>
40 #include <asm/i8259.h>
41 #include <asm/irq_vectors.h>
42 #include <asm/visws/lithium.h>
44 #include <linux/sched.h>
45 #include <linux/kernel.h>
46 #include <linux/pci.h>
47 #include <linux/pci_ids.h>
49 extern int no_broadcast;
53 char visws_board_type = -1;
54 char visws_board_rev = -1;
56 int is_visws_box(void)
58 return visws_board_type >= 0;
61 static int __init visws_time_init(void)
63 printk(KERN_INFO "Starting Cobalt Timer system clock\n");
65 /* Set the countdown value */
66 co_cpu_write(CO_CPU_TIMEVAL, CO_TIME_HZ/HZ);
69 co_cpu_write(CO_CPU_CTRL, co_cpu_read(CO_CPU_CTRL) | CO_CTRL_TIMERUN);
71 /* Enable (unmask) the timer interrupt */
72 co_cpu_write(CO_CPU_CTRL, co_cpu_read(CO_CPU_CTRL) & ~CO_CTRL_TIMEMASK);
75 * Zero return means the generic timer setup code will set up
76 * the standard vector:
81 static int __init visws_pre_intr_init(void)
83 init_VISWS_APIC_irqs();
86 * We dont want ISA irqs to be set up by the generic code:
91 /* Quirk for machine specific memory setup. */
93 #define MB (1024 * 1024)
95 unsigned long sgivwfb_mem_phys;
96 unsigned long sgivwfb_mem_size;
97 EXPORT_SYMBOL(sgivwfb_mem_phys);
98 EXPORT_SYMBOL(sgivwfb_mem_size);
100 long long mem_size __initdata = 0;
102 static char * __init visws_memory_setup(void)
104 long long gfx_mem_size = 8 * MB;
106 mem_size = boot_params.alt_mem_k;
109 printk(KERN_WARNING "Bootloader didn't set memory size, upgrade it !\n");
114 * this hardcodes the graphics memory to 8 MB
115 * it really should be sized dynamically (or at least
116 * set as a boot param)
118 if (!sgivwfb_mem_size) {
119 printk(KERN_WARNING "Defaulting to 8 MB framebuffer size\n");
120 sgivwfb_mem_size = 8 * MB;
126 sgivwfb_mem_size &= ~((1 << 20) - 1);
127 sgivwfb_mem_phys = mem_size - gfx_mem_size;
129 e820_add_region(0, LOWMEMSIZE(), E820_RAM);
130 e820_add_region(HIGH_MEMORY, mem_size - sgivwfb_mem_size - HIGH_MEMORY, E820_RAM);
131 e820_add_region(sgivwfb_mem_phys, sgivwfb_mem_size, E820_RESERVED);
136 static void visws_machine_emergency_restart(void)
139 * Visual Workstations restart after this
140 * register is poked on the PIIX4
142 outb(PIIX4_RESET_VAL, PIIX4_RESET_PORT);
145 static void visws_machine_power_off(void)
147 unsigned short pm_status;
148 /* extern unsigned int pci_bus0; */
150 while ((pm_status = inw(PMSTS_PORT)) & 0x100)
151 outw(pm_status, PMSTS_PORT);
153 outw(PM_SUSPEND_ENABLE, PMCNTRL_PORT);
157 #define PCI_CONF1_ADDRESS(bus, devfn, reg) \
158 (0x80000000 | (bus << 16) | (devfn << 8) | (reg & ~3))
160 /* outl(PCI_CONF1_ADDRESS(pci_bus0, SPECIAL_DEV, SPECIAL_REG), 0xCF8); */
161 outl(PIIX_SPECIAL_STOP, 0xCFC);
164 static int __init visws_get_smp_config(unsigned int early)
167 * Prevent MP-table parsing by the generic code:
172 extern unsigned int __cpuinitdata maxcpus;
175 * The Visual Workstation is Intel MP compliant in the hardware
176 * sense, but it doesn't have a BIOS(-configuration table).
177 * No problem for Linux.
180 static void __init MP_processor_info(struct mpc_config_processor *m)
182 int ver, logical_apicid;
183 physid_mask_t apic_cpus;
185 if (!(m->mpc_cpuflag & CPU_ENABLED))
188 logical_apicid = m->mpc_apicid;
189 printk(KERN_INFO "%sCPU #%d %u:%u APIC version %d\n",
190 m->mpc_cpuflag & CPU_BOOTPROCESSOR ? "Bootup " : "",
192 (m->mpc_cpufeature & CPU_FAMILY_MASK) >> 8,
193 (m->mpc_cpufeature & CPU_MODEL_MASK) >> 4,
196 if (m->mpc_cpuflag & CPU_BOOTPROCESSOR)
197 boot_cpu_physical_apicid = m->mpc_apicid;
199 ver = m->mpc_apicver;
200 if ((ver >= 0x14 && m->mpc_apicid >= 0xff) || m->mpc_apicid >= 0xf) {
201 printk(KERN_ERR "Processor #%d INVALID. (Max ID: %d).\n",
202 m->mpc_apicid, MAX_APICS);
206 apic_cpus = apicid_to_cpu_present(m->mpc_apicid);
207 physids_or(phys_cpu_present_map, phys_cpu_present_map, apic_cpus);
212 printk(KERN_ERR "BIOS bug, APIC version is 0 for CPU#%d! "
213 "fixing up to 0x10. (tell your hw vendor)\n",
217 apic_version[m->mpc_apicid] = ver;
220 static int __init visws_find_smp_config(unsigned int reserve)
222 struct mpc_config_processor *mp = phys_to_virt(CO_CPU_TAB_PHYS);
223 unsigned short ncpus = readw(phys_to_virt(CO_CPU_NUM_PHYS));
225 if (ncpus > CO_CPU_MAX) {
226 printk(KERN_WARNING "find_visws_smp: got cpu count of %d at %p\n",
235 #ifdef CONFIG_X86_LOCAL_APIC
236 smp_found_config = 1;
239 MP_processor_info(mp++);
241 mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
246 static int visws_trap_init(void);
248 static struct x86_quirks visws_x86_quirks __initdata = {
249 .arch_time_init = visws_time_init,
250 .arch_pre_intr_init = visws_pre_intr_init,
251 .arch_memory_setup = visws_memory_setup,
252 .arch_intr_init = NULL,
253 .arch_trap_init = visws_trap_init,
254 .mach_get_smp_config = visws_get_smp_config,
255 .mach_find_smp_config = visws_find_smp_config,
258 void __init visws_early_detect(void)
262 visws_board_type = (char)(inb_p(PIIX_GPI_BD_REG) & PIIX_GPI_BD_REG)
263 >> PIIX_GPI_BD_SHIFT;
265 if (visws_board_type < 0)
269 * Install special quirks for timer, interrupt and memory setup:
270 * Fall back to generic behavior for traps:
271 * Override generic MP-table parsing:
273 x86_quirks = &visws_x86_quirks;
276 * Install reboot quirks:
278 pm_power_off = visws_machine_power_off;
279 machine_ops.emergency_restart = visws_machine_emergency_restart;
282 * Do not use broadcast IPIs:
286 #ifdef CONFIG_X86_IO_APIC
288 * Turn off IO-APIC detection and initialization:
290 skip_ioapic_setup = 1;
295 * First, we have to initialize the 307 part to allow us access
296 * to the GPIO registers. Let's map them at 0x0fc0 which is right
297 * after the PIIX4 PM section.
299 outb_p(SIO_DEV_SEL, SIO_INDEX);
300 outb_p(SIO_GP_DEV, SIO_DATA); /* Talk to GPIO regs. */
302 outb_p(SIO_DEV_MSB, SIO_INDEX);
303 outb_p(SIO_GP_MSB, SIO_DATA); /* MSB of GPIO base address */
305 outb_p(SIO_DEV_LSB, SIO_INDEX);
306 outb_p(SIO_GP_LSB, SIO_DATA); /* LSB of GPIO base address */
308 outb_p(SIO_DEV_ENB, SIO_INDEX);
309 outb_p(1, SIO_DATA); /* Enable GPIO registers. */
312 * Now, we have to map the power management section to write
313 * a bit which enables access to the GPIO registers.
314 * What lunatic came up with this shit?
316 outb_p(SIO_DEV_SEL, SIO_INDEX);
317 outb_p(SIO_PM_DEV, SIO_DATA); /* Talk to GPIO regs. */
319 outb_p(SIO_DEV_MSB, SIO_INDEX);
320 outb_p(SIO_PM_MSB, SIO_DATA); /* MSB of PM base address */
322 outb_p(SIO_DEV_LSB, SIO_INDEX);
323 outb_p(SIO_PM_LSB, SIO_DATA); /* LSB of PM base address */
325 outb_p(SIO_DEV_ENB, SIO_INDEX);
326 outb_p(1, SIO_DATA); /* Enable PM registers. */
329 * Now, write the PM register which enables the GPIO registers.
331 outb_p(SIO_PM_FER2, SIO_PM_INDEX);
332 outb_p(SIO_PM_GP_EN, SIO_PM_DATA);
335 * Now, initialize the GPIO registers.
336 * We want them all to be inputs which is the
337 * power on default, so let's leave them alone.
338 * So, let's just read the board rev!
340 raw = inb_p(SIO_GP_DATA1);
341 raw &= 0x7f; /* 7 bits of valid board revision ID. */
343 if (visws_board_type == VISWS_320) {
346 } else if (raw < 0xc) {
351 } else if (visws_board_type == VISWS_540) {
354 visws_board_rev = raw;
357 printk(KERN_INFO "Silicon Graphics Visual Workstation %s (rev %d) detected\n",
358 (visws_board_type == VISWS_320 ? "320" :
359 (visws_board_type == VISWS_540 ? "540" :
360 "unknown")), visws_board_rev);
363 #define A01234 (LI_INTA_0 | LI_INTA_1 | LI_INTA_2 | LI_INTA_3 | LI_INTA_4)
364 #define BCD (LI_INTB | LI_INTC | LI_INTD)
365 #define ALLDEVS (A01234 | BCD)
367 static __init void lithium_init(void)
369 set_fixmap(FIX_LI_PCIA, LI_PCI_A_PHYS);
370 set_fixmap(FIX_LI_PCIB, LI_PCI_B_PHYS);
372 if ((li_pcia_read16(PCI_VENDOR_ID) != PCI_VENDOR_ID_SGI) ||
373 (li_pcia_read16(PCI_DEVICE_ID) != PCI_DEVICE_ID_SGI_LITHIUM)) {
374 printk(KERN_EMERG "Lithium hostbridge %c not found\n", 'A');
375 /* panic("This machine is not SGI Visual Workstation 320/540"); */
378 if ((li_pcib_read16(PCI_VENDOR_ID) != PCI_VENDOR_ID_SGI) ||
379 (li_pcib_read16(PCI_DEVICE_ID) != PCI_DEVICE_ID_SGI_LITHIUM)) {
380 printk(KERN_EMERG "Lithium hostbridge %c not found\n", 'B');
381 /* panic("This machine is not SGI Visual Workstation 320/540"); */
384 li_pcia_write16(LI_PCI_INTEN, ALLDEVS);
385 li_pcib_write16(LI_PCI_INTEN, ALLDEVS);
388 static __init void cobalt_init(void)
391 * On normal SMP PC this is used only with SMP, but we have to
392 * use it and set it up here to start the Cobalt clock
394 set_fixmap(FIX_APIC_BASE, APIC_DEFAULT_PHYS_BASE);
396 printk(KERN_INFO "Local APIC Version %#x, ID %#x\n",
397 (unsigned int)apic_read(APIC_LVR),
398 (unsigned int)apic_read(APIC_ID));
400 set_fixmap(FIX_CO_CPU, CO_CPU_PHYS);
401 set_fixmap(FIX_CO_APIC, CO_APIC_PHYS);
402 printk(KERN_INFO "Cobalt Revision %#lx, APIC ID %#lx\n",
403 co_cpu_read(CO_CPU_REV), co_apic_read(CO_APIC_ID));
405 /* Enable Cobalt APIC being careful to NOT change the ID! */
406 co_apic_write(CO_APIC_ID, co_apic_read(CO_APIC_ID) | CO_APIC_ENABLE);
408 printk(KERN_INFO "Cobalt APIC enabled: ID reg %#lx\n",
409 co_apic_read(CO_APIC_ID));
412 static int __init visws_trap_init(void)
421 * IRQ controller / APIC support:
424 static DEFINE_SPINLOCK(cobalt_lock);
427 * Set the given Cobalt APIC Redirection Table entry to point
428 * to the given IDT vector/index.
430 static inline void co_apic_set(int entry, int irq)
432 co_apic_write(CO_APIC_LO(entry), CO_APIC_LEVEL | (irq + FIRST_EXTERNAL_VECTOR));
433 co_apic_write(CO_APIC_HI(entry), 0);
437 * Cobalt (IO)-APIC functions to handle PCI devices.
439 static inline int co_apic_ide0_hack(void)
441 extern char visws_board_type;
442 extern char visws_board_rev;
444 if (visws_board_type == VISWS_320 && visws_board_rev == 5)
449 static int is_co_apic(unsigned int irq)
455 case 0: return CO_APIC_CPU;
456 case CO_IRQ_IDE0: return co_apic_ide0_hack();
457 case CO_IRQ_IDE1: return CO_APIC_IDE1;
464 * This is the SGI Cobalt (IO-)APIC:
467 static void enable_cobalt_irq(unsigned int irq)
469 co_apic_set(is_co_apic(irq), irq);
472 static void disable_cobalt_irq(unsigned int irq)
474 int entry = is_co_apic(irq);
476 co_apic_write(CO_APIC_LO(entry), CO_APIC_MASK);
477 co_apic_read(CO_APIC_LO(entry));
481 * "irq" really just serves to identify the device. Here is where we
482 * map this to the Cobalt APIC entry where it's physically wired.
483 * This is called via request_irq -> setup_irq -> irq_desc->startup()
485 static unsigned int startup_cobalt_irq(unsigned int irq)
489 spin_lock_irqsave(&cobalt_lock, flags);
490 if ((irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS | IRQ_WAITING)))
491 irq_desc[irq].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)
511 spin_lock_irqsave(&cobalt_lock, flags);
512 if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS)))
513 enable_cobalt_irq(irq);
514 spin_unlock_irqrestore(&cobalt_lock, flags);
517 static struct irq_chip cobalt_irq_type = {
518 .typename = "Cobalt-APIC",
519 .startup = startup_cobalt_irq,
520 .shutdown = disable_cobalt_irq,
521 .enable = enable_cobalt_irq,
522 .disable = disable_cobalt_irq,
523 .ack = ack_cobalt_irq,
524 .end = end_cobalt_irq,
529 * This is the PIIX4-based 8259 that is wired up indirectly to Cobalt
530 * -- not the manner expected by the code in i8259.c.
532 * there is a 'master' physical interrupt source that gets sent to
533 * the CPU. But in the chipset there are various 'virtual' interrupts
534 * waiting to be handled. We represent this to Linux through a 'master'
535 * interrupt controller type, and through a special virtual interrupt-
536 * controller. Device drivers only see the virtual interrupt sources.
538 static unsigned int startup_piix4_master_irq(unsigned int irq)
542 return startup_cobalt_irq(irq);
545 static void end_piix4_master_irq(unsigned int irq)
549 spin_lock_irqsave(&cobalt_lock, flags);
550 enable_cobalt_irq(irq);
551 spin_unlock_irqrestore(&cobalt_lock, flags);
554 static struct irq_chip piix4_master_irq_type = {
555 .typename = "PIIX4-master",
556 .startup = startup_piix4_master_irq,
557 .ack = ack_cobalt_irq,
558 .end = end_piix4_master_irq,
562 static struct irq_chip piix4_virtual_irq_type = {
563 .typename = "PIIX4-virtual",
564 .shutdown = disable_8259A_irq,
565 .enable = enable_8259A_irq,
566 .disable = disable_8259A_irq,
571 * PIIX4-8259 master/virtual functions to handle interrupt requests
572 * from legacy devices: floppy, parallel, serial, rtc.
574 * None of these get Cobalt APIC entries, neither do they have IDT
575 * entries. These interrupts are purely virtual and distributed from
576 * the 'master' interrupt source: CO_IRQ_8259.
578 * When the 8259 interrupts its handler figures out which of these
579 * devices is interrupting and dispatches to its handler.
581 * CAREFUL: devices see the 'virtual' interrupt only. Thus disable/
582 * enable_irq gets the right irq. This 'master' irq is never directly
583 * manipulated by any driver.
585 static irqreturn_t piix4_master_intr(int irq, void *dev_id)
591 spin_lock_irqsave(&i8259A_lock, flags);
593 /* Find out what's interrupting in the PIIX4 master 8259 */
594 outb(0x0c, 0x20); /* OCW3 Poll command */
598 * Bit 7 == 0 means invalid/spurious
600 if (unlikely(!(realirq & 0x80)))
605 if (unlikely(realirq == 2)) {
609 if (unlikely(!(realirq & 0x80)))
612 realirq = (realirq & 7) + 8;
615 /* mask and ack interrupt */
616 cached_irq_mask |= 1 << realirq;
617 if (unlikely(realirq > 7)) {
619 outb(cached_slave_mask, 0xa1);
620 outb(0x60 + (realirq & 7), 0xa0);
621 outb(0x60 + 2, 0x20);
624 outb(cached_master_mask, 0x21);
625 outb(0x60 + realirq, 0x20);
628 spin_unlock_irqrestore(&i8259A_lock, flags);
630 desc = irq_desc + realirq;
633 * handle this 'virtual interrupt' as a Cobalt one now.
635 kstat_cpu(smp_processor_id()).irqs[realirq]++;
637 if (likely(desc->action != NULL))
638 handle_IRQ_event(realirq, desc->action);
640 if (!(desc->status & IRQ_DISABLED))
641 enable_8259A_irq(realirq);
646 spin_unlock_irqrestore(&i8259A_lock, flags);
650 static struct irqaction master_action = {
651 .handler = piix4_master_intr,
652 .name = "PIIX4-8259",
655 static struct irqaction cascade_action = {
656 .handler = no_action,
661 void init_VISWS_APIC_irqs(void)
665 for (i = 0; i < CO_IRQ_APIC0 + CO_APIC_LAST + 1; i++) {
666 irq_desc[i].status = IRQ_DISABLED;
667 irq_desc[i].action = 0;
668 irq_desc[i].depth = 1;
671 irq_desc[i].chip = &cobalt_irq_type;
673 else if (i == CO_IRQ_IDE0) {
674 irq_desc[i].chip = &cobalt_irq_type;
676 else if (i == CO_IRQ_IDE1) {
677 irq_desc[i].chip = &cobalt_irq_type;
679 else if (i == CO_IRQ_8259) {
680 irq_desc[i].chip = &piix4_master_irq_type;
682 else if (i < CO_IRQ_APIC0) {
683 irq_desc[i].chip = &piix4_virtual_irq_type;
685 else if (IS_CO_APIC(i)) {
686 irq_desc[i].chip = &cobalt_irq_type;
690 setup_irq(CO_IRQ_8259, &master_action);
691 setup_irq(2, &cascade_action);