Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 209 insertions, 0 deletions

diff --git a/arch/ppc64/kernel/iSeries_irq.c b/arch/ppc64/kernel/iSeries_irq.c
new file mode 100644
index 00000000000..f831d259dbb
--- /dev/null
+++ b/arch/ppc64/kernel/iSeries_irq.c
@@ -0,0 +1,209 @@
+/************************************************************************/
+/* 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)
+{
+}