/* * SGI Visual Workstation support and quirks, unmaintained. * * Split out from setup.c by davej@suse.de * * Copyright (C) 1999 Bent Hagemark, Ingo Molnar * * SGI Visual Workstation interrupt controller * * The Cobalt system ASIC in the Visual Workstation contains a "Cobalt" APIC * which serves as the main interrupt controller in the system. Non-legacy * hardware in the system uses this controller directly. Legacy devices * are connected to the PIIX4 which in turn has its 8259(s) connected to * a of the Cobalt APIC entry. * * 09/02/2000 - Updated for 2.4 by jbarnes@sgi.com * * 25/11/2002 - Updated for 2.5 by Andrey Panin <pazke@orbita1.ru> */ #include <linux/interrupt.h> #include <linux/module.h> #include <linux/init.h> #include <linux/smp.h> #include <asm/visws/cobalt.h> #include <asm/visws/piix4.h> #include <asm/arch_hooks.h> #include <asm/io_apic.h> #include <asm/fixmap.h> #include <asm/reboot.h> #include <asm/setup.h> #include <asm/e820.h> #include <asm/io.h> #include <mach_ipi.h> #include "mach_apic.h" #include <linux/kernel_stat.h> #include <asm/i8259.h> #include <asm/irq_vectors.h> #include <asm/visws/lithium.h> #include <linux/sched.h> #include <linux/kernel.h> #include <linux/pci.h> #include <linux/pci_ids.h> extern int no_broadcast; #include <asm/apic.h> char visws_board_type = -1; char visws_board_rev = -1; int is_visws_box(void) { return visws_board_type >= 0; } static int __init visws_time_init(void) { printk(KERN_INFO "Starting Cobalt Timer system clock\n"); /* Set the countdown value */ co_cpu_write(CO_CPU_TIMEVAL, CO_TIME_HZ/HZ); /* Start the timer */ co_cpu_write(CO_CPU_CTRL, co_cpu_read(CO_CPU_CTRL) | CO_CTRL_TIMERUN); /* Enable (unmask) the timer interrupt */ co_cpu_write(CO_CPU_CTRL, co_cpu_read(CO_CPU_CTRL) & ~CO_CTRL_TIMEMASK); /* * Zero return means the generic timer setup code will set up * the standard vector: */ return 0; } static int __init visws_pre_intr_init(void) { init_VISWS_APIC_irqs(); /* * We dont want ISA irqs to be set up by the generic code: */ return 1; } /* Quirk for machine specific memory setup. */ #define MB (1024 * 1024) unsigned long sgivwfb_mem_phys; unsigned long sgivwfb_mem_size; EXPORT_SYMBOL(sgivwfb_mem_phys); EXPORT_SYMBOL(sgivwfb_mem_size); long long mem_size __initdata = 0; static char * __init visws_memory_setup(void) { long long gfx_mem_size = 8 * MB; mem_size = boot_params.alt_mem_k; if (!mem_size) { printk(KERN_WARNING "Bootloader didn't set memory size, upgrade it !\n"); mem_size = 128 * MB; } /* * this hardcodes the graphics memory to 8 MB * it really should be sized dynamically (or at least * set as a boot param) */ if (!sgivwfb_mem_size) { printk(KERN_WARNING "Defaulting to 8 MB framebuffer size\n"); sgivwfb_mem_size = 8 * MB; } /* * Trim to nearest MB */ sgivwfb_mem_size &= ~((1 << 20) - 1); sgivwfb_mem_phys = mem_size - gfx_mem_size; e820_add_region(0, LOWMEMSIZE(), E820_RAM); e820_add_region(HIGH_MEMORY, mem_size - sgivwfb_mem_size - HIGH_MEMORY, E820_RAM); e820_add_region(sgivwfb_mem_phys, sgivwfb_mem_size, E820_RESERVED); return "PROM"; } static void visws_machine_emergency_restart(void) { /* * Visual Workstations restart after this * register is poked on the PIIX4 */ outb(PIIX4_RESET_VAL, PIIX4_RESET_PORT); } static void visws_machine_power_off(void) { unsigned short pm_status; /* extern unsigned int pci_bus0; */ while ((pm_status = inw(PMSTS_PORT)) & 0x100) outw(pm_status, PMSTS_PORT); outw(PM_SUSPEND_ENABLE, PMCNTRL_PORT); mdelay(10); #define PCI_CONF1_ADDRESS(bus, devfn, reg) \ (0x80000000 | (bus << 16) | (devfn << 8) | (reg & ~3)) /* outl(PCI_CONF1_ADDRESS(pci_bus0, SPECIAL_DEV, SPECIAL_REG), 0xCF8); */ outl(PIIX_SPECIAL_STOP, 0xCFC); } static int __init visws_get_smp_config(unsigned int early) { /* * Prevent MP-table parsing by the generic code: */ return 1; } /* * The Visual Workstation is Intel MP compliant in the hardware * sense, but it doesn't have a BIOS(-configuration table). * No problem for Linux. */ static void __init MP_processor_info(struct mpc_config_processor *m) { int ver, logical_apicid; physid_mask_t apic_cpus; if (!(m->mpc_cpuflag & CPU_ENABLED)) return; logical_apicid = m->mpc_apicid; printk(KERN_INFO "%sCPU #%d %u:%u APIC version %d\n", m->mpc_cpuflag & CPU_BOOTPROCESSOR ? "Bootup " : "", m->mpc_apicid, (m->mpc_cpufeature & CPU_FAMILY_MASK) >> 8, (m->mpc_cpufeature & CPU_MODEL_MASK) >> 4, m->mpc_apicver); if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) boot_cpu_physical_apicid = m->mpc_apicid; ver = m->mpc_apicver; if ((ver >= 0x14 && m->mpc_apicid >= 0xff) || m->mpc_apicid >= 0xf) { printk(KERN_ERR "Processor #%d INVALID. (Max ID: %d).\n", m->mpc_apicid, MAX_APICS); return; } apic_cpus = apicid_to_cpu_present(m->mpc_apicid); physids_or(phys_cpu_present_map, phys_cpu_present_map, apic_cpus); /* * Validate version */ if (ver == 0x0) { printk(KERN_ERR "BIOS bug, APIC version is 0 for CPU#%d! " "fixing up to 0x10. (tell your hw vendor)\n", m->mpc_apicid); ver = 0x10; } apic_version[m->mpc_apicid] = ver; } static int __init visws_find_smp_config(unsigned int reserve) { struct mpc_config_processor *mp = phys_to_virt(CO_CPU_TAB_PHYS); unsigned short ncpus = readw(phys_to_virt(CO_CPU_NUM_PHYS)); if (ncpus > CO_CPU_MAX) { printk(KERN_WARNING "find_visws_smp: got cpu count of %d at %p\n", ncpus, mp); ncpus = CO_CPU_MAX; } if (ncpus > setup_max_cpus) ncpus = setup_max_cpus; #ifdef CONFIG_X86_LOCAL_APIC smp_found_config = 1; #endif while (ncpus--) MP_processor_info(mp++); mp_lapic_addr = APIC_DEFAULT_PHYS_BASE; return 1; } static int visws_trap_init(void); static struct x86_quirks visws_x86_quirks __initdata = { .arch_time_init = visws_time_init, .arch_pre_intr_init = visws_pre_intr_init, .arch_memory_setup = visws_memory_setup, .arch_intr_init = NULL, .arch_trap_init = visws_trap_init, .mach_get_smp_config = visws_get_smp_config, .mach_find_smp_config = visws_find_smp_config, }; void __init visws_early_detect(void) { int raw; visws_board_type = (char)(inb_p(PIIX_GPI_BD_REG) & PIIX_GPI_BD_REG) >> PIIX_GPI_BD_SHIFT; if (visws_board_type < 0) return; /* * Install special quirks for timer, interrupt and memory setup: * Fall back to generic behavior for traps: * Override generic MP-table parsing: */ x86_quirks = &visws_x86_quirks; /* * Install reboot quirks: */ pm_power_off = visws_machine_power_off; machine_ops.emergency_restart = visws_machine_emergency_restart; /* * Do not use broadcast IPIs: */ no_broadcast = 0; #ifdef CONFIG_X86_IO_APIC /* * Turn off IO-APIC detection and initialization: */ skip_ioapic_setup = 1; #endif /* * Get Board rev. * First, we have to initialize the 307 part to allow us access * to the GPIO registers. Let's map them at 0x0fc0 which is right * after the PIIX4 PM section. */ outb_p(SIO_DEV_SEL, SIO_INDEX); outb_p(SIO_GP_DEV, SIO_DATA); /* Talk to GPIO regs. */ outb_p(SIO_DEV_MSB, SIO_INDEX); outb_p(SIO_GP_MSB, SIO_DATA); /* MSB of GPIO base address */ outb_p(SIO_DEV_LSB, SIO_INDEX); outb_p(SIO_GP_LSB, SIO_DATA); /* LSB of GPIO base address */ outb_p(SIO_DEV_ENB, SIO_INDEX); outb_p(1, SIO_DATA); /* Enable GPIO registers. */ /* * Now, we have to map the power management section to write * a bit which enables access to the GPIO registers. * What lunatic came up with this shit? */ outb_p(SIO_DEV_SEL, SIO_INDEX); outb_p(SIO_PM_DEV, SIO_DATA); /* Talk to GPIO regs. */ outb_p(SIO_DEV_MSB, SIO_INDEX); outb_p(SIO_PM_MSB, SIO_DATA); /* MSB of PM base address */ outb_p(SIO_DEV_LSB, SIO_INDEX); outb_p(SIO_PM_LSB, SIO_DATA); /* LSB of PM base address */ outb_p(SIO_DEV_ENB, SIO_INDEX); outb_p(1, SIO_DATA); /* Enable PM registers. */ /* * Now, write the PM register which enables the GPIO registers. */ outb_p(SIO_PM_FER2, SIO_PM_INDEX); outb_p(SIO_PM_GP_EN, SIO_PM_DATA); /* * Now, initialize the GPIO registers. * We want them all to be inputs which is the * power on default, so let's leave them alone. * So, let's just read the board rev! */ raw = inb_p(SIO_GP_DATA1); raw &= 0x7f; /* 7 bits of valid board revision ID. */ if (visws_board_type == VISWS_320) { if (raw < 0x6) { visws_board_rev = 4; } else if (raw < 0xc) { visws_board_rev = 5; } else { visws_board_rev = 6; } } else if (visws_board_type == VISWS_540) { visws_board_rev = 2; } else { visws_board_rev = raw; } printk(KERN_INFO "Silicon Graphics Visual Workstation %s (rev %d) detected\n", (visws_board_type == VISWS_320 ? "320" : (visws_board_type == VISWS_540 ? "540" : "unknown")), visws_board_rev); } #define A01234 (LI_INTA_0 | LI_INTA_1 | LI_INTA_2 | LI_INTA_3 | LI_INTA_4) #define BCD (LI_INTB | LI_INTC | LI_INTD) #define ALLDEVS (A01234 | BCD) static __init void lithium_init(void) { set_fixmap(FIX_LI_PCIA, LI_PCI_A_PHYS); set_fixmap(FIX_LI_PCIB, LI_PCI_B_PHYS); if ((li_pcia_read16(PCI_VENDOR_ID) != PCI_VENDOR_ID_SGI) || (li_pcia_read16(PCI_DEVICE_ID) != PCI_DEVICE_ID_SGI_LITHIUM)) { printk(KERN_EMERG "Lithium hostbridge %c not found\n", 'A'); /* panic("This machine is not SGI Visual Workstation 320/540"); */ } if ((li_pcib_read16(PCI_VENDOR_ID) != PCI_VENDOR_ID_SGI) || (li_pcib_read16(PCI_DEVICE_ID) != PCI_DEVICE_ID_SGI_LITHIUM)) { printk(KERN_EMERG "Lithium hostbridge %c not found\n", 'B'); /* panic("This machine is not SGI Visual Workstation 320/540"); */ } li_pcia_write16(LI_PCI_INTEN, ALLDEVS); li_pcib_write16(LI_PCI_INTEN, ALLDEVS); } static __init void cobalt_init(void) { /* * On normal SMP PC this is used only with SMP, but we have to * use it and set it up here to start the Cobalt clock */ set_fixmap(FIX_APIC_BASE, APIC_DEFAULT_PHYS_BASE); setup_local_APIC(); printk(KERN_INFO "Local APIC Version %#x, ID %#x\n", (unsigned int)apic_read(APIC_LVR), (unsigned int)apic_read(APIC_ID)); set_fixmap(FIX_CO_CPU, CO_CPU_PHYS); set_fixmap(FIX_CO_APIC, CO_APIC_PHYS); printk(KERN_INFO "Cobalt Revision %#lx, APIC ID %#lx\n", co_cpu_read(CO_CPU_REV), co_apic_read(CO_APIC_ID)); /* Enable Cobalt APIC being careful to NOT change the ID! */ co_apic_write(CO_APIC_ID, co_apic_read(CO_APIC_ID) | CO_APIC_ENABLE); printk(KERN_INFO "Cobalt APIC enabled: ID reg %#lx\n", co_apic_read(CO_APIC_ID)); } static int __init visws_trap_init(void) { lithium_init(); cobalt_init(); return 1; } /* * IRQ controller / APIC support: */ static DEFINE_SPINLOCK(cobalt_lock); /* * Set the given Cobalt APIC Redirection Table entry to point * to the given IDT vector/index. */ static inline void co_apic_set(int entry, int irq) { co_apic_write(CO_APIC_LO(entry), CO_APIC_LEVEL | (irq + FIRST_EXTERNAL_VECTOR)); co_apic_write(CO_APIC_HI(entry), 0); } /* * Cobalt (IO)-APIC functions to handle PCI devices. */ static inline int co_apic_ide0_hack(void) { extern char visws_board_type; extern char visws_board_rev; if (visws_board_type == VISWS_320 && visws_board_rev == 5) return 5; return CO_APIC_IDE0; } static int is_co_apic(unsigned int irq) { if (IS_CO_APIC(irq)) return CO_APIC(irq); switch (irq) { case 0: return CO_APIC_CPU; case CO_IRQ_IDE0: return co_apic_ide0_hack(); case CO_IRQ_IDE1: return CO_APIC_IDE1; default: return -1; } } /* * This is the SGI Cobalt (IO-)APIC: */ static void enable_cobalt_irq(unsigned int irq) { co_apic_set(is_co_apic(irq), irq); } static void disable_cobalt_irq(unsigned int irq) { int entry = is_co_apic(irq); co_apic_write(CO_APIC_LO(entry), CO_APIC_MASK); co_apic_read(CO_APIC_LO(entry)); } /* * "irq" really just serves to identify the device. Here is where we * map this to the Cobalt APIC entry where it's physically wired. * This is called via request_irq -> setup_irq -> irq_desc->startup() */ static unsigned int startup_cobalt_irq(unsigned int irq) { unsigned long flags; struct irq_desc *desc = irq_to_desc(irq); spin_lock_irqsave(&cobalt_lock, flags); if ((desc->status & (IRQ_DISABLED | IRQ_INPROGRESS | IRQ_WAITING))) desc->status &= ~(IRQ_DISABLED | IRQ_INPROGRESS | IRQ_WAITING); enable_cobalt_irq(irq); spin_unlock_irqrestore(&cobalt_lock, flags); return 0; } static void ack_cobalt_irq(unsigned int irq) { unsigned long flags; spin_lock_irqsave(&cobalt_lock, flags); disable_cobalt_irq(irq); apic_write(APIC_EOI, APIC_EIO_ACK); spin_unlock_irqrestore(&cobalt_lock, flags); } static void end_cobalt_irq(unsigned int irq) { unsigned long flags; struct irq_desc *desc = irq_to_desc(irq); spin_lock_irqsave(&cobalt_lock, flags); if (!(desc->status & (IRQ_DISABLED | IRQ_INPROGRESS))) enable_cobalt_irq(irq); spin_unlock_irqrestore(&cobalt_lock, flags); } static struct irq_chip cobalt_irq_type = { .typename = "Cobalt-APIC", .startup = startup_cobalt_irq, .shutdown = disable_cobalt_irq, .enable = enable_cobalt_irq, .disable = disable_cobalt_irq, .ack = ack_cobalt_irq, .end = end_cobalt_irq, }; /* * This is the PIIX4-based 8259 that is wired up indirectly to Cobalt * -- not the manner expected by the code in i8259.c. * * there is a 'master' physical interrupt source that gets sent to * the CPU. But in the chipset there are various 'virtual' interrupts * waiting to be handled. We represent this to Linux through a 'master' * interrupt controller type, and through a special virtual interrupt- * controller. Device drivers only see the virtual interrupt sources. */ static unsigned int startup_piix4_master_irq(unsigned int irq) { init_8259A(0); return startup_cobalt_irq(irq); } static void end_piix4_master_irq(unsigned int irq) { unsigned long flags; spin_lock_irqsave(&cobalt_lock, flags); enable_cobalt_irq(irq); spin_unlock_irqrestore(&cobalt_lock, flags); } static struct irq_chip piix4_master_irq_type = { .typename = "PIIX4-master", .startup = startup_piix4_master_irq, .ack = ack_cobalt_irq, .end = end_piix4_master_irq, }; static struct irq_chip piix4_virtual_irq_type = { .typename = "PIIX4-virtual", .shutdown = disable_8259A_irq, .enable = enable_8259A_irq, .disable = disable_8259A_irq, }; /* * PIIX4-8259 master/virtual functions to handle interrupt requests * from legacy devices: floppy, parallel, serial, rtc. * * None of these get Cobalt APIC entries, neither do they have IDT * entries. These interrupts are purely virtual and distributed from * the 'master' interrupt source: CO_IRQ_8259. * * When the 8259 interrupts its handler figures out which of these * devices is interrupting and dispatches to its handler. * * CAREFUL: devices see the 'virtual' interrupt only. Thus disable/ * enable_irq gets the right irq. This 'master' irq is never directly * manipulated by any driver. */ static irqreturn_t piix4_master_intr(int irq, void *dev_id) { int realirq; irq_desc_t *desc; unsigned long flags; spin_lock_irqsave(&i8259A_lock, flags); /* Find out what's interrupting in the PIIX4 master 8259 */ outb(0x0c, 0x20); /* OCW3 Poll command */ realirq = inb(0x20); /* * Bit 7 == 0 means invalid/spurious */ if (unlikely(!(realirq & 0x80))) goto out_unlock; realirq &= 7; if (unlikely(realirq == 2)) { outb(0x0c, 0xa0); realirq = inb(0xa0); if (unlikely(!(realirq & 0x80))) goto out_unlock; realirq = (realirq & 7) + 8; } /* mask and ack interrupt */ cached_irq_mask |= 1 << realirq; if (unlikely(realirq > 7)) { inb(0xa1); outb(cached_slave_mask, 0xa1); outb(0x60 + (realirq & 7), 0xa0); outb(0x60 + 2, 0x20); } else { inb(0x21); outb(cached_master_mask, 0x21); outb(0x60 + realirq, 0x20); } spin_unlock_irqrestore(&i8259A_lock, flags); desc = irq_to_desc(realirq); /* * handle this 'virtual interrupt' as a Cobalt one now. */ kstat_incr_irqs_this_cpu(realirq, desc); if (likely(desc->action != NULL)) handle_IRQ_event(realirq, desc->action); if (!(desc->status & IRQ_DISABLED)) enable_8259A_irq(realirq); return IRQ_HANDLED; out_unlock: spin_unlock_irqrestore(&i8259A_lock, flags); return IRQ_NONE; } static struct irqaction master_action = { .handler = piix4_master_intr, .name = "PIIX4-8259", }; static struct irqaction cascade_action = { .handler = no_action, .name = "cascade", }; void init_VISWS_APIC_irqs(void) { int i; for (i = 0; i < CO_IRQ_APIC0 + CO_APIC_LAST + 1; i++) { struct irq_desc *desc = irq_to_desc(i); desc->status = IRQ_DISABLED; desc->action = 0; desc->depth = 1; if (i == 0) { desc->chip = &cobalt_irq_type; } else if (i == CO_IRQ_IDE0) { desc->chip = &cobalt_irq_type; } else if (i == CO_IRQ_IDE1) { desc->chip = &cobalt_irq_type; } else if (i == CO_IRQ_8259) { desc->chip = &piix4_master_irq_type; } else if (i < CO_IRQ_APIC0) { desc->chip = &piix4_virtual_irq_type; } else if (IS_CO_APIC(i)) { desc->chip = &cobalt_irq_type; } } setup_irq(CO_IRQ_8259, &master_action); setup_irq(2, &cascade_action); }