/* ** I/O Sapic Driver - PCI interrupt line support ** ** (c) Copyright 1999 Grant Grundler ** (c) Copyright 1999 Hewlett-Packard Company ** ** This program is free software; you can redistribute it and/or modify ** it under the terms of the GNU General Public License as published by ** the Free Software Foundation; either version 2 of the License, or ** (at your option) any later version. ** ** The I/O sapic driver manages the Interrupt Redirection Table which is ** the control logic to convert PCI line based interrupts into a Message ** Signaled Interrupt (aka Transaction Based Interrupt, TBI). ** ** Acronyms ** -------- ** HPA Hard Physical Address (aka MMIO address) ** IRQ Interrupt ReQuest. Implies Line based interrupt. ** IRT Interrupt Routing Table (provided by PAT firmware) ** IRdT Interrupt Redirection Table. IRQ line to TXN ADDR/DATA ** table which is implemented in I/O SAPIC. ** ISR Interrupt Service Routine. aka Interrupt handler. ** MSI Message Signaled Interrupt. PCI 2.2 functionality. ** aka Transaction Based Interrupt (or TBI). ** PA Precision Architecture. HP's RISC architecture. ** RISC Reduced Instruction Set Computer. ** ** ** What's a Message Signalled Interrupt? ** ------------------------------------- ** MSI is a write transaction which targets a processor and is similar ** to a processor write to memory or MMIO. MSIs can be generated by I/O ** devices as well as processors and require *architecture* to work. ** ** PA only supports MSI. So I/O subsystems must either natively generate ** MSIs (e.g. GSC or HP-PB) or convert line based interrupts into MSIs ** (e.g. PCI and EISA). IA64 supports MSIs via a "local SAPIC" which ** acts on behalf of a processor. ** ** MSI allows any I/O device to interrupt any processor. This makes ** load balancing of the interrupt processing possible on an SMP platform. ** Interrupts are also ordered WRT to DMA data. It's possible on I/O ** coherent systems to completely eliminate PIO reads from the interrupt ** path. The device and driver must be designed and implemented to ** guarantee all DMA has been issued (issues about atomicity here) ** before the MSI is issued. I/O status can then safely be read from ** DMA'd data by the ISR. ** ** ** PA Firmware ** ----------- ** PA-RISC platforms have two fundamentally different types of firmware. ** For PCI devices, "Legacy" PDC initializes the "INTERRUPT_LINE" register ** and BARs similar to a traditional PC BIOS. ** The newer "PAT" firmware supports PDC calls which return tables. ** PAT firmware only initializes the PCI Console and Boot interface. ** With these tables, the OS can program all other PCI devices. ** ** One such PAT PDC call returns the "Interrupt Routing Table" (IRT). ** The IRT maps each PCI slot's INTA-D "output" line to an I/O SAPIC ** input line. If the IRT is not available, this driver assumes ** INTERRUPT_LINE register has been programmed by firmware. The latter ** case also means online addition of PCI cards can NOT be supported ** even if HW support is present. ** ** All platforms with PAT firmware to date (Oct 1999) use one Interrupt ** Routing Table for the entire platform. ** ** Where's the iosapic? ** -------------------- ** I/O sapic is part of the "Core Electronics Complex". And on HP platforms ** it's integrated as part of the PCI bus adapter, "lba". So no bus walk ** will discover I/O Sapic. I/O Sapic driver learns about each device ** when lba driver advertises the presence of the I/O sapic by calling ** iosapic_register(). ** ** ** IRQ handling notes ** ------------------ ** The IO-SAPIC can indicate to the CPU which interrupt was asserted. ** So, unlike the GSC-ASIC and Dino, we allocate one CPU interrupt per ** IO-SAPIC interrupt and call the device driver's handler directly. ** The IO-SAPIC driver hijacks the CPU interrupt handler so it can ** issue the End Of Interrupt command to the IO-SAPIC. ** ** Overview of exported iosapic functions ** -------------------------------------- ** (caveat: code isn't finished yet - this is just the plan) ** ** iosapic_init: ** o initialize globals (lock, etc) ** o try to read IRT. Presence of IRT determines if this is ** a PAT platform or not. ** ** iosapic_register(): ** o create iosapic_info instance data structure ** o allocate vector_info array for this iosapic ** o initialize vector_info - read corresponding IRdT? ** ** iosapic_xlate_pin: (only called by fixup_irq for PAT platform) ** o intr_pin = read cfg (INTERRUPT_PIN); ** o if (device under PCI-PCI bridge) ** translate slot/pin ** ** iosapic_fixup_irq: ** o if PAT platform (IRT present) ** intr_pin = iosapic_xlate_pin(isi,pcidev): ** intr_line = find IRT entry(isi, PCI_SLOT(pcidev), intr_pin) ** save IRT entry into vector_info later ** write cfg INTERRUPT_LINE (with intr_line)? ** else ** intr_line = pcidev->irq ** IRT pointer = NULL ** endif ** o locate vector_info (needs: isi, intr_line) ** o allocate processor "irq" and get txn_addr/data ** o request_irq(processor_irq, iosapic_interrupt, vector_info,...) ** ** iosapic_enable_irq: ** o clear any pending IRQ on that line ** o enable IRdT - call enable_irq(vector[line]->processor_irq) ** o write EOI in case line is already asserted. ** ** iosapic_disable_irq: ** o disable IRdT - call disable_irq(vector[line]->processor_irq) */ /* FIXME: determine which include files are really needed */ #include <linux/types.h> #include <linux/kernel.h> #include <linux/spinlock.h> #include <linux/pci.h> #include <linux/init.h> #include <linux/slab.h> #include <linux/interrupt.h> #include <asm/byteorder.h> /* get in-line asm for swab */ #include <asm/pdc.h> #include <asm/pdcpat.h> #include <asm/page.h> #include <asm/system.h> #include <asm/io.h> /* read/write functions */ #ifdef CONFIG_SUPERIO #include <asm/superio.h> #endif #include <asm/ropes.h> #include "./iosapic_private.h" #define MODULE_NAME "iosapic" /* "local" compile flags */ #undef PCI_BRIDGE_FUNCS #undef DEBUG_IOSAPIC #undef DEBUG_IOSAPIC_IRT #ifdef DEBUG_IOSAPIC #define DBG(x...) printk(x) #else /* DEBUG_IOSAPIC */ #define DBG(x...) #endif /* DEBUG_IOSAPIC */ #ifdef DEBUG_IOSAPIC_IRT #define DBG_IRT(x...) printk(x) #else #define DBG_IRT(x...) #endif #ifdef CONFIG_64BIT #define COMPARE_IRTE_ADDR(irte, hpa) ((irte)->dest_iosapic_addr == (hpa)) #else #define COMPARE_IRTE_ADDR(irte, hpa) \ ((irte)->dest_iosapic_addr == ((hpa) | 0xffffffff00000000ULL)) #endif #define IOSAPIC_REG_SELECT 0x00 #define IOSAPIC_REG_WINDOW 0x10 #define IOSAPIC_REG_EOI 0x40 #define IOSAPIC_REG_VERSION 0x1 #define IOSAPIC_IRDT_ENTRY(idx) (0x10+(idx)*2) #define IOSAPIC_IRDT_ENTRY_HI(idx) (0x11+(idx)*2) static inline unsigned int iosapic_read(void __iomem *iosapic, unsigned int reg) { writel(reg, iosapic + IOSAPIC_REG_SELECT); return readl(iosapic + IOSAPIC_REG_WINDOW); } static inline void iosapic_write(void __iomem *iosapic, unsigned int reg, u32 val) { writel(reg, iosapic + IOSAPIC_REG_SELECT); writel(val, iosapic + IOSAPIC_REG_WINDOW); } #define IOSAPIC_VERSION_MASK 0x000000ff #define IOSAPIC_VERSION(ver) ((int) (ver & IOSAPIC_VERSION_MASK)) #define IOSAPIC_MAX_ENTRY_MASK 0x00ff0000 #define IOSAPIC_MAX_ENTRY_SHIFT 0x10 #define IOSAPIC_IRDT_MAX_ENTRY(ver) \ (int) (((ver) & IOSAPIC_MAX_ENTRY_MASK) >> IOSAPIC_MAX_ENTRY_SHIFT) /* bits in the "low" I/O Sapic IRdT entry */ #define IOSAPIC_IRDT_ENABLE 0x10000 #define IOSAPIC_IRDT_PO_LOW 0x02000 #define IOSAPIC_IRDT_LEVEL_TRIG 0x08000 #define IOSAPIC_IRDT_MODE_LPRI 0x00100 /* bits in the "high" I/O Sapic IRdT entry */ #define IOSAPIC_IRDT_ID_EID_SHIFT 0x10 static DEFINE_SPINLOCK(iosapic_lock); static inline void iosapic_eoi(void __iomem *addr, unsigned int data) { __raw_writel(data, addr); } /* ** REVISIT: future platforms may have more than one IRT. ** If so, the following three fields form a structure which ** then be linked into a list. Names are chosen to make searching ** for them easy - not necessarily accurate (eg "cell"). ** ** Alternative: iosapic_info could point to the IRT it's in. ** iosapic_register() could search a list of IRT's. */ static struct irt_entry *irt_cell; static size_t irt_num_entry; static struct irt_entry *iosapic_alloc_irt(int num_entries) { unsigned long a; /* The IRT needs to be 8-byte aligned for the PDC call. * Normally kmalloc would guarantee larger alignment, but * if CONFIG_DEBUG_SLAB is enabled, then we can get only * 4-byte alignment on 32-bit kernels */ a = (unsigned long)kmalloc(sizeof(struct irt_entry) * num_entries + 8, GFP_KERNEL); a = (a + 7UL) & ~7UL; return (struct irt_entry *)a; } /** * iosapic_load_irt - Fill in the interrupt routing table * @cell_num: The cell number of the CPU we're currently executing on * @irt: The address to place the new IRT at * @return The number of entries found * * The "Get PCI INT Routing Table Size" option returns the number of * entries in the PCI interrupt routing table for the cell specified * in the cell_number argument. The cell number must be for a cell * within the caller's protection domain. * * The "Get PCI INT Routing Table" option returns, for the cell * specified in the cell_number argument, the PCI interrupt routing * table in the caller allocated memory pointed to by mem_addr. * We assume the IRT only contains entries for I/O SAPIC and * calculate the size based on the size of I/O sapic entries. * * The PCI interrupt routing table entry format is derived from the * IA64 SAL Specification 2.4. The PCI interrupt routing table defines * the routing of PCI interrupt signals between the PCI device output * "pins" and the IO SAPICs' input "lines" (including core I/O PCI * devices). This table does NOT include information for devices/slots * behind PCI to PCI bridges. See PCI to PCI Bridge Architecture Spec. * for the architected method of routing of IRQ's behind PPB's. */ static int __init iosapic_load_irt(unsigned long cell_num, struct irt_entry **irt) { long status; /* PDC return value status */ struct irt_entry *table; /* start of interrupt routing tbl */ unsigned long num_entries = 0UL; BUG_ON(!irt); if (is_pdc_pat()) { /* Use pat pdc routine to get interrupt routing table size */ DBG("calling get_irt_size (cell %ld)\n", cell_num); status = pdc_pat_get_irt_size(&num_entries, cell_num); DBG("get_irt_size: %ld\n", status); BUG_ON(status != PDC_OK); BUG_ON(num_entries == 0); /* ** allocate memory for interrupt routing table ** This interface isn't really right. We are assuming ** the contents of the table are exclusively ** for I/O sapic devices. */ table = iosapic_alloc_irt(num_entries); if (table == NULL) { printk(KERN_WARNING MODULE_NAME ": read_irt : can " "not alloc mem for IRT\n"); return 0; } /* get PCI INT routing table */ status = pdc_pat_get_irt(table, cell_num); DBG("pdc_pat_get_irt: %ld\n", status); WARN_ON(status != PDC_OK); } else { /* ** C3000/J5000 (and similar) platforms with Sprockets PDC ** will return exactly one IRT for all iosapics. ** So if we have one, don't need to get it again. */ if (irt_cell) return 0; /* Should be using the Elroy's HPA, but it's ignored anyway */ status = pdc_pci_irt_size(&num_entries, 0); DBG("pdc_pci_irt_size: %ld\n", status); if (status != PDC_OK) { /* Not a "legacy" system with I/O SAPIC either */ return 0; } BUG_ON(num_entries == 0); table = iosapic_alloc_irt(num_entries); if (!table) { printk(KERN_WARNING MODULE_NAME ": read_irt : can " "not alloc mem for IRT\n"); return 0; } /* HPA ignored by this call too. */ status = pdc_pci_irt(num_entries, 0, table); BUG_ON(status != PDC_OK); } /* return interrupt table address */ *irt = table; #ifdef DEBUG_IOSAPIC_IRT { struct irt_entry *p = table; int i; printk(MODULE_NAME " Interrupt Routing Table (cell %ld)\n", cell_num); printk(MODULE_NAME " start = 0x%p num_entries %ld entry_size %d\n", table, num_entries, (int) sizeof(struct irt_entry)); for (i = 0 ; i < num_entries ; i++, p++) { printk(MODULE_NAME " %02x %02x %02x %02x %02x %02x %02x %02x %08x%08x\n", p->entry_type, p->entry_length, p->interrupt_type, p->polarity_trigger, p->src_bus_irq_devno, p->src_bus_id, p->src_seg_id, p->dest_iosapic_intin, ((u32 *) p)[2], ((u32 *) p)[3] ); } } #endif /* DEBUG_IOSAPIC_IRT */ return num_entries; } void __init iosapic_init(void) { unsigned long cell = 0; DBG("iosapic_init()\n"); #ifdef __LP64__ if (is_pdc_pat()) { int status; struct pdc_pat_cell_num cell_info; status = pdc_pat_cell_get_number(&cell_info); if (status == PDC_OK) { cell = cell_info.cell_num; } } #endif /* get interrupt routing table for this cell */ irt_num_entry = iosapic_load_irt(cell, &irt_cell); if (irt_num_entry == 0) irt_cell = NULL; /* old PDC w/o iosapic */ } /* ** Return the IRT entry in case we need to look something else up. */ static struct irt_entry * irt_find_irqline(struct iosapic_info *isi, u8 slot, u8 intr_pin) { struct irt_entry *i = irt_cell; int cnt; /* track how many entries we've looked at */ u8 irq_devno = (slot << IRT_DEV_SHIFT) | (intr_pin-1); DBG_IRT("irt_find_irqline() SLOT %d pin %d\n", slot, intr_pin); for (cnt=0; cnt < irt_num_entry; cnt++, i++) { /* ** Validate: entry_type, entry_length, interrupt_type ** ** Difference between validate vs compare is the former ** should print debug info and is not expected to "fail" ** on current platforms. */ if (i->entry_type != IRT_IOSAPIC_TYPE) { DBG_IRT(KERN_WARNING MODULE_NAME ":find_irqline(0x%p): skipping entry %d type %d\n", i, cnt, i->entry_type); continue; } if (i->entry_length != IRT_IOSAPIC_LENGTH) { DBG_IRT(KERN_WARNING MODULE_NAME ":find_irqline(0x%p): skipping entry %d length %d\n", i, cnt, i->entry_length); continue; } if (i->interrupt_type != IRT_VECTORED_INTR) { DBG_IRT(KERN_WARNING MODULE_NAME ":find_irqline(0x%p): skipping entry %d interrupt_type %d\n", i, cnt, i->interrupt_type); continue; } if (!COMPARE_IRTE_ADDR(i, isi->isi_hpa)) continue; if ((i->src_bus_irq_devno & IRT_IRQ_DEVNO_MASK) != irq_devno) continue; /* ** Ignore: src_bus_id and rc_seg_id correlate with ** iosapic_info->isi_hpa on HP platforms. ** If needed, pass in "PFA" (aka config space addr) ** instead of slot. */ /* Found it! */ return i; } printk(KERN_WARNING MODULE_NAME ": 0x%lx : no IRT entry for slot %d, pin %d\n", isi->isi_hpa, slot, intr_pin); return NULL; } /* ** xlate_pin() supports the skewing of IRQ lines done by subsidiary bridges. ** Legacy PDC already does this translation for us and stores it in INTR_LINE. ** ** PAT PDC needs to basically do what legacy PDC does: ** o read PIN ** o adjust PIN in case device is "behind" a PPB ** (eg 4-port 100BT and SCSI/LAN "Combo Card") ** o convert slot/pin to I/O SAPIC input line. ** ** HP platforms only support: ** o one level of skewing for any number of PPBs ** o only support PCI-PCI Bridges. */ static struct irt_entry * iosapic_xlate_pin(struct iosapic_info *isi, struct pci_dev *pcidev) { u8 intr_pin, intr_slot; pci_read_config_byte(pcidev, PCI_INTERRUPT_PIN, &intr_pin); DBG_IRT("iosapic_xlate_pin(%s) SLOT %d pin %d\n", pcidev->slot_name, PCI_SLOT(pcidev->devfn), intr_pin); if (intr_pin == 0) { /* The device does NOT support/use IRQ lines. */ return NULL; } /* Check if pcidev behind a PPB */ if (NULL != pcidev->bus->self) { /* Convert pcidev INTR_PIN into something we ** can lookup in the IRT. */ #ifdef PCI_BRIDGE_FUNCS /* ** Proposal #1: ** ** call implementation specific translation function ** This is architecturally "cleaner". HP-UX doesn't ** support other secondary bus types (eg. E/ISA) directly. ** May be needed for other processor (eg IA64) architectures ** or by some ambitous soul who wants to watch TV. */ if (pci_bridge_funcs->xlate_intr_line) { intr_pin = pci_bridge_funcs->xlate_intr_line(pcidev); } #else /* PCI_BRIDGE_FUNCS */ struct pci_bus *p = pcidev->bus; /* ** Proposal #2: ** The "pin" is skewed ((pin + dev - 1) % 4). ** ** This isn't very clean since I/O SAPIC must assume: ** - all platforms only have PCI busses. ** - only PCI-PCI bridge (eg not PCI-EISA, PCI-PCMCIA) ** - IRQ routing is only skewed once regardless of ** the number of PPB's between iosapic and device. ** (Bit3 expansion chassis follows this rule) ** ** Advantage is it's really easy to implement. */ intr_pin = ((intr_pin-1)+PCI_SLOT(pcidev->devfn)) % 4; intr_pin++; /* convert back to INTA-D (1-4) */ #endif /* PCI_BRIDGE_FUNCS */ /* ** Locate the host slot the PPB nearest the Host bus ** adapter. */ while (NULL != p->parent->self) p = p->parent; intr_slot = PCI_SLOT(p->self->devfn); } else { intr_slot = PCI_SLOT(pcidev->devfn); } DBG_IRT("iosapic_xlate_pin: bus %d slot %d pin %d\n", pcidev->bus->secondary, intr_slot, intr_pin); return irt_find_irqline(isi, intr_slot, intr_pin); } static void iosapic_rd_irt_entry(struct vector_info *vi , u32 *dp0, u32 *dp1) { struct iosapic_info *isp = vi->iosapic; u8 idx = vi->irqline; *dp0 = iosapic_read(isp->addr, IOSAPIC_IRDT_ENTRY(idx)); *dp1 = iosapic_read(isp->addr, IOSAPIC_IRDT_ENTRY_HI(idx)); } static void iosapic_wr_irt_entry(struct vector_info *vi, u32 dp0, u32 dp1) { struct iosapic_info *isp = vi->iosapic; DBG_IRT("iosapic_wr_irt_entry(): irq %d hpa %lx 0x%x 0x%x\n", vi->irqline, isp->isi_hpa, dp0, dp1); iosapic_write(isp->addr, IOSAPIC_IRDT_ENTRY(vi->irqline), dp0); /* Read the window register to flush the writes down to HW */ dp0 = readl(isp->addr+IOSAPIC_REG_WINDOW); iosapic_write(isp->addr, IOSAPIC_IRDT_ENTRY_HI(vi->irqline), dp1); /* Read the window register to flush the writes down to HW */ dp1 = readl(isp->addr+IOSAPIC_REG_WINDOW); } /* ** set_irt prepares the data (dp0, dp1) according to the vector_info ** and target cpu (id_eid). dp0/dp1 are then used to program I/O SAPIC ** IRdT for the given "vector" (aka IRQ line). */ static void iosapic_set_irt_data( struct vector_info *vi, u32 *dp0, u32 *dp1) { u32 mode = 0; struct irt_entry *p = vi->irte; if ((p->polarity_trigger & IRT_PO_MASK) == IRT_ACTIVE_LO) mode |= IOSAPIC_IRDT_PO_LOW; if (((p->polarity_trigger >> IRT_EL_SHIFT) & IRT_EL_MASK) == IRT_LEVEL_TRIG) mode |= IOSAPIC_IRDT_LEVEL_TRIG; /* ** IA64 REVISIT ** PA doesn't support EXTINT or LPRIO bits. */ *dp0 = mode | (u32) vi->txn_data; /* ** Extracting id_eid isn't a real clean way of getting it. ** But the encoding is the same for both PA and IA64 platforms. */ if (is_pdc_pat()) { /* ** PAT PDC just hands it to us "right". ** txn_addr comes from cpu_data[x].txn_addr. */ *dp1 = (u32) (vi->txn_addr); } else { /* ** eg if base_addr == 0xfffa0000), ** we want to get 0xa0ff0000. ** ** eid 0x0ff00000 -> 0x00ff0000 ** id 0x000ff000 -> 0xff000000 */ *dp1 = (((u32)vi->txn_addr & 0x0ff00000) >> 4) | (((u32)vi->txn_addr & 0x000ff000) << 12); } DBG_IRT("iosapic_set_irt_data(): 0x%x 0x%x\n", *dp0, *dp1); } static struct vector_info *iosapic_get_vector(unsigned int irq) { return irq_desc[irq].chip_data; } static void iosapic_disable_irq(unsigned int irq) { unsigned long flags; struct vector_info *vi = iosapic_get_vector(irq); u32 d0, d1; spin_lock_irqsave(&iosapic_lock, flags); iosapic_rd_irt_entry(vi, &d0, &d1); d0 |= IOSAPIC_IRDT_ENABLE; iosapic_wr_irt_entry(vi, d0, d1); spin_unlock_irqrestore(&iosapic_lock, flags); } static void iosapic_enable_irq(unsigned int irq) { struct vector_info *vi = iosapic_get_vector(irq); u32 d0, d1; /* data is initialized by fixup_irq */ WARN_ON(vi->txn_irq == 0); iosapic_set_irt_data(vi, &d0, &d1); iosapic_wr_irt_entry(vi, d0, d1); #ifdef DEBUG_IOSAPIC_IRT { u32 *t = (u32 *) ((ulong) vi->eoi_addr & ~0xffUL); printk("iosapic_enable_irq(): regs %p", vi->eoi_addr); for ( ; t < vi->eoi_addr; t++) printk(" %x", readl(t)); printk("\n"); } printk("iosapic_enable_irq(): sel "); { struct iosapic_info *isp = vi->iosapic; for (d0=0x10; d0<0x1e; d0++) { d1 = iosapic_read(isp->addr, d0); printk(" %x", d1); } } printk("\n"); #endif /* * Issuing I/O SAPIC an EOI causes an interrupt IFF IRQ line is * asserted. IRQ generally should not be asserted when a driver * enables their IRQ. It can lead to "interesting" race conditions * in the driver initialization sequence. */ DBG(KERN_DEBUG "enable_irq(%d): eoi(%p, 0x%x)\n", irq, vi->eoi_addr, vi->eoi_data); iosapic_eoi(vi->eoi_addr, vi->eoi_data); } /* * PARISC only supports PCI devices below I/O SAPIC. * PCI only supports level triggered in order to share IRQ lines. * ergo I/O SAPIC must always issue EOI on parisc. * * i386/ia64 support ISA devices and have to deal with * edge-triggered interrupts too. */ static void iosapic_end_irq(unsigned int irq) { struct vector_info *vi = iosapic_get_vector(irq); DBG(KERN_DEBUG "end_irq(%d): eoi(%p, 0x%x)\n", irq, vi->eoi_addr, vi->eoi_data); iosapic_eoi(vi->eoi_addr, vi->eoi_data); cpu_end_irq(irq); } static unsigned int iosapic_startup_irq(unsigned int irq) { iosapic_enable_irq(irq); return 0; } #ifdef CONFIG_SMP static void iosapic_set_affinity_irq(unsigned int irq, cpumask_t dest) { struct vector_info *vi = iosapic_get_vector(irq); u32 d0, d1, dummy_d0; unsigned long flags; if (cpu_check_affinity(irq, &dest)) return; vi->txn_addr = txn_affinity_addr(irq, first_cpu(dest)); spin_lock_irqsave(&iosapic_lock, flags); /* d1 contains the destination CPU, so only want to set that * entry */ iosapic_rd_irt_entry(vi, &d0, &d1); iosapic_set_irt_data(vi, &dummy_d0, &d1); iosapic_wr_irt_entry(vi, d0, d1); spin_unlock_irqrestore(&iosapic_lock, flags); } #endif static struct hw_interrupt_type iosapic_interrupt_type = { .typename = "IO-SAPIC-level", .startup = iosapic_startup_irq, .shutdown = iosapic_disable_irq, .enable = iosapic_enable_irq, .disable = iosapic_disable_irq, .ack = cpu_ack_irq, .end = iosapic_end_irq, #ifdef CONFIG_SMP .set_affinity = iosapic_set_affinity_irq, #endif }; int iosapic_fixup_irq(void *isi_obj, struct pci_dev *pcidev) { struct iosapic_info *isi = isi_obj; struct irt_entry *irte = NULL; /* only used if PAT PDC */ struct vector_info *vi; int isi_line; /* line used by device */ if (!isi) { printk(KERN_WARNING MODULE_NAME ": hpa not registered for %s\n", pci_name(pcidev)); return -1; } #ifdef CONFIG_SUPERIO /* * HACK ALERT! (non-compliant PCI device support) * * All SuckyIO interrupts are routed through the PIC's on function 1. * But SuckyIO OHCI USB controller gets an IRT entry anyway because * it advertises INT D for INT_PIN. Use that IRT entry to get the * SuckyIO interrupt routing for PICs on function 1 (*BLEECCHH*). */ if (is_superio_device(pcidev)) { /* We must call superio_fixup_irq() to register the pdev */ pcidev->irq = superio_fixup_irq(pcidev); /* Don't return if need to program the IOSAPIC's IRT... */ if (PCI_FUNC(pcidev->devfn) != SUPERIO_USB_FN) return pcidev->irq; } #endif /* CONFIG_SUPERIO */ /* lookup IRT entry for isi/slot/pin set */ irte = iosapic_xlate_pin(isi, pcidev); if (!irte) { printk("iosapic: no IRTE for %s (IRQ not connected?)\n", pci_name(pcidev)); return -1; } DBG_IRT("iosapic_fixup_irq(): irte %p %x %x %x %x %x %x %x %x\n", irte, irte->entry_type, irte->entry_length, irte->polarity_trigger, irte->src_bus_irq_devno, irte->src_bus_id, irte->src_seg_id, irte->dest_iosapic_intin, (u32) irte->dest_iosapic_addr); isi_line = irte->dest_iosapic_intin; /* get vector info for this input line */ vi = isi->isi_vector + isi_line; DBG_IRT("iosapic_fixup_irq: line %d vi 0x%p\n", isi_line, vi); /* If this IRQ line has already been setup, skip it */ if (vi->irte) goto out; vi->irte = irte; /* * Allocate processor IRQ * * XXX/FIXME The txn_alloc_irq() code and related code should be * moved to enable_irq(). That way we only allocate processor IRQ * bits for devices that actually have drivers claiming them. * Right now we assign an IRQ to every PCI device present, * regardless of whether it's used or not. */ vi->txn_irq = txn_alloc_irq(8); if (vi->txn_irq < 0) panic("I/O sapic: couldn't get TXN IRQ\n"); /* enable_irq() will use txn_* to program IRdT */ vi->txn_addr = txn_alloc_addr(vi->txn_irq); vi->txn_data = txn_alloc_data(vi->txn_irq); vi->eoi_addr = isi->addr + IOSAPIC_REG_EOI; vi->eoi_data = cpu_to_le32(vi->txn_data); cpu_claim_irq(vi->txn_irq, &iosapic_interrupt_type, vi); out: pcidev->irq = vi->txn_irq; DBG_IRT("iosapic_fixup_irq() %d:%d %x %x line %d irq %d\n", PCI_SLOT(pcidev->devfn), PCI_FUNC(pcidev->devfn), pcidev->vendor, pcidev->device, isi_line, pcidev->irq); return pcidev->irq; } /* ** squirrel away the I/O Sapic Version */ static unsigned int iosapic_rd_version(struct iosapic_info *isi) { return iosapic_read(isi->addr, IOSAPIC_REG_VERSION); } /* ** iosapic_register() is called by "drivers" with an integrated I/O SAPIC. ** Caller must be certain they have an I/O SAPIC and know its MMIO address. ** ** o allocate iosapic_info and add it to the list ** o read iosapic version and squirrel that away ** o read size of IRdT. ** o allocate and initialize isi_vector[] ** o allocate irq region */ void *iosapic_register(unsigned long hpa) { struct iosapic_info *isi = NULL; struct irt_entry *irte = irt_cell; struct vector_info *vip; int cnt; /* track how many entries we've looked at */ /* * Astro based platforms can only support PCI OLARD if they implement * PAT PDC. Legacy PDC omits LBAs with no PCI devices from the IRT. * Search the IRT and ignore iosapic's which aren't in the IRT. */ for (cnt=0; cnt < irt_num_entry; cnt++, irte++) { WARN_ON(IRT_IOSAPIC_TYPE != irte->entry_type); if (COMPARE_IRTE_ADDR(irte, hpa)) break; } if (cnt >= irt_num_entry) { DBG("iosapic_register() ignoring 0x%lx (NOT FOUND)\n", hpa); return NULL; } isi = kzalloc(sizeof(struct iosapic_info), GFP_KERNEL); if (!isi) { BUG(); return NULL; } isi->addr = ioremap_nocache(hpa, 4096); isi->isi_hpa = hpa; isi->isi_version = iosapic_rd_version(isi); isi->isi_num_vectors = IOSAPIC_IRDT_MAX_ENTRY(isi->isi_version) + 1; vip = isi->isi_vector = (struct vector_info *) kzalloc(sizeof(struct vector_info) * isi->isi_num_vectors, GFP_KERNEL); if (vip == NULL) { kfree(isi); return NULL; } for (cnt=0; cnt < isi->isi_num_vectors; cnt++, vip++) { vip->irqline = (unsigned char) cnt; vip->iosapic = isi; } return isi; } #ifdef DEBUG_IOSAPIC static void iosapic_prt_irt(void *irt, long num_entry) { unsigned int i, *irp = (unsigned int *) irt; printk(KERN_DEBUG MODULE_NAME ": Interrupt Routing Table (%lx entries)\n", num_entry); for (i=0; i<num_entry; i++, irp += 4) { printk(KERN_DEBUG "%p : %2d %.8x %.8x %.8x %.8x\n", irp, i, irp[0], irp[1], irp[2], irp[3]); } } static void iosapic_prt_vi(struct vector_info *vi) { printk(KERN_DEBUG MODULE_NAME ": vector_info[%d] is at %p\n", vi->irqline, vi); printk(KERN_DEBUG "\t\tstatus: %.4x\n", vi->status); printk(KERN_DEBUG "\t\ttxn_irq: %d\n", vi->txn_irq); printk(KERN_DEBUG "\t\ttxn_addr: %lx\n", vi->txn_addr); printk(KERN_DEBUG "\t\ttxn_data: %lx\n", vi->txn_data); printk(KERN_DEBUG "\t\teoi_addr: %p\n", vi->eoi_addr); printk(KERN_DEBUG "\t\teoi_data: %x\n", vi->eoi_data); } static void iosapic_prt_isi(struct iosapic_info *isi) { printk(KERN_DEBUG MODULE_NAME ": io_sapic_info at %p\n", isi); printk(KERN_DEBUG "\t\tisi_hpa: %lx\n", isi->isi_hpa); printk(KERN_DEBUG "\t\tisi_status: %x\n", isi->isi_status); printk(KERN_DEBUG "\t\tisi_version: %x\n", isi->isi_version); printk(KERN_DEBUG "\t\tisi_vector: %p\n", isi->isi_vector); } #endif /* DEBUG_IOSAPIC */