/************************************************************************/ /* This module supports the iSeries PCI bus interrupt handling */ /* Copyright (C) 20yy <Robert L Holtorf> <IBM Corp> */ /* */ /* 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. */ /* */ /* This program is distributed in the hope that it will be useful, */ /* but WITHOUT ANY WARRANTY; without even the implied warranty of */ /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ /* GNU General Public License for more details. */ /* */ /* You should have received a copy of the GNU General Public License */ /* along with this program; if not, write to the: */ /* Free Software Foundation, Inc., */ /* 59 Temple Place, Suite 330, */ /* Boston, MA 02111-1307 USA */ /************************************************************************/ /* Change Activity: */ /* Created, December 13, 2000 by Wayne Holm */ /* End Change Activity */ /************************************************************************/ #include <linux/pci.h> #include <linux/init.h> #include <linux/threads.h> #include <linux/smp.h> #include <linux/param.h> #include <linux/string.h> #include <linux/bootmem.h> #include <linux/ide.h> #include <linux/irq.h> #include <linux/spinlock.h> #include <asm/ppcdebug.h> #include <asm/iSeries/HvCallPci.h> #include <asm/iSeries/HvCallXm.h> #include <asm/iSeries/iSeries_irq.h> #include <asm/iSeries/XmPciLpEvent.h> static unsigned int iSeries_startup_IRQ(unsigned int irq); static void iSeries_shutdown_IRQ(unsigned int irq); static void iSeries_enable_IRQ(unsigned int irq); static void iSeries_disable_IRQ(unsigned int irq); static void iSeries_end_IRQ(unsigned int irq); static hw_irq_controller iSeries_IRQ_handler = { .typename = "iSeries irq controller", .startup = iSeries_startup_IRQ, .shutdown = iSeries_shutdown_IRQ, .enable = iSeries_enable_IRQ, .disable = iSeries_disable_IRQ, .end = iSeries_end_IRQ }; /* This maps virtual irq numbers to real irqs */ unsigned int virt_irq_to_real_map[NR_IRQS]; /* The next available virtual irq number */ /* Note: the pcnet32 driver assumes irq numbers < 2 aren't valid. :( */ static int next_virtual_irq = 2; /* This is called by init_IRQ. set in ppc_md.init_IRQ by iSeries_setup.c */ void __init iSeries_init_IRQ(void) { /* Register PCI event handler and open an event path */ XmPciLpEvent_init(); } /* * This is called out of iSeries_scan_slot to allocate an IRQ for an EADS slot * It calculates the irq value for the slot. * Note that subBusNumber is always 0 (at the moment at least). */ int __init iSeries_allocate_IRQ(HvBusNumber busNumber, HvSubBusNumber subBusNumber, HvAgentId deviceId) { unsigned int realirq, virtirq; u8 idsel = (deviceId >> 4); u8 function = deviceId & 7; virtirq = next_virtual_irq++; realirq = ((busNumber - 1) << 6) + ((idsel - 1) << 3) + function; virt_irq_to_real_map[virtirq] = realirq; irq_desc[virtirq].handler = &iSeries_IRQ_handler; return virtirq; } #define REAL_IRQ_TO_BUS(irq) ((((irq) >> 6) & 0xff) + 1) #define REAL_IRQ_TO_IDSEL(irq) ((((irq) >> 3) & 7) + 1) #define REAL_IRQ_TO_FUNC(irq) ((irq) & 7) /* This is called by iSeries_activate_IRQs */ static unsigned int iSeries_startup_IRQ(unsigned int irq) { u32 bus, deviceId, function, mask; const u32 subBus = 0; unsigned int rirq = virt_irq_to_real_map[irq]; bus = REAL_IRQ_TO_BUS(rirq); function = REAL_IRQ_TO_FUNC(rirq); deviceId = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function; /* Link the IRQ number to the bridge */ HvCallXm_connectBusUnit(bus, subBus, deviceId, irq); /* Unmask bridge interrupts in the FISR */ mask = 0x01010000 << function; HvCallPci_unmaskFisr(bus, subBus, deviceId, mask); iSeries_enable_IRQ(irq); return 0; } /* * This is called out of iSeries_fixup to activate interrupt * generation for usable slots */ void __init iSeries_activate_IRQs() { int irq; unsigned long flags; for_each_irq (irq) { irq_desc_t *desc = get_irq_desc(irq); if (desc && desc->handler && desc->handler->startup) { spin_lock_irqsave(&desc->lock, flags); desc->handler->startup(irq); spin_unlock_irqrestore(&desc->lock, flags); } } } /* this is not called anywhere currently */ static void iSeries_shutdown_IRQ(unsigned int irq) { u32 bus, deviceId, function, mask; const u32 subBus = 0; unsigned int rirq = virt_irq_to_real_map[irq]; /* irq should be locked by the caller */ bus = REAL_IRQ_TO_BUS(rirq); function = REAL_IRQ_TO_FUNC(rirq); deviceId = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function; /* Invalidate the IRQ number in the bridge */ HvCallXm_connectBusUnit(bus, subBus, deviceId, 0); /* Mask bridge interrupts in the FISR */ mask = 0x01010000 << function; HvCallPci_maskFisr(bus, subBus, deviceId, mask); } /* * This will be called by device drivers (via disable_IRQ) * to disable INTA in the bridge interrupt status register. */ static void iSeries_disable_IRQ(unsigned int irq) { u32 bus, deviceId, function, mask; const u32 subBus = 0; unsigned int rirq = virt_irq_to_real_map[irq]; /* The IRQ has already been locked by the caller */ bus = REAL_IRQ_TO_BUS(rirq); function = REAL_IRQ_TO_FUNC(rirq); deviceId = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function; /* Mask secondary INTA */ mask = 0x80000000; HvCallPci_maskInterrupts(bus, subBus, deviceId, mask); PPCDBG(PPCDBG_BUSWALK, "iSeries_disable_IRQ 0x%02X.%02X.%02X 0x%04X\n", bus, subBus, deviceId, irq); } /* * This will be called by device drivers (via enable_IRQ) * to enable INTA in the bridge interrupt status register. */ static void iSeries_enable_IRQ(unsigned int irq) { u32 bus, deviceId, function, mask; const u32 subBus = 0; unsigned int rirq = virt_irq_to_real_map[irq]; /* The IRQ has already been locked by the caller */ bus = REAL_IRQ_TO_BUS(rirq); function = REAL_IRQ_TO_FUNC(rirq); deviceId = (REAL_IRQ_TO_IDSEL(rirq) << 4) + function; /* Unmask secondary INTA */ mask = 0x80000000; HvCallPci_unmaskInterrupts(bus, subBus, deviceId, mask); PPCDBG(PPCDBG_BUSWALK, "iSeries_enable_IRQ 0x%02X.%02X.%02X 0x%04X\n", bus, subBus, deviceId, irq); } /* * Need to define this so ppc_irq_dispatch_handler will NOT call * enable_IRQ at the end of interrupt handling. However, this does * nothing because there is not enough information provided to do * the EOI HvCall. This is done by XmPciLpEvent.c */ static void iSeries_end_IRQ(unsigned int irq) { }