Commit cebf589c authored by Arnd Bergmann's avatar Arnd Bergmann Committed by Paul Mackerras
Browse files

[PATCH] ppc64: Add driver for BPA interrupt controllers 



Add support for the integrated interrupt controller on BPA
CPUs. There is one of those for each SMT thread.

The mapping of interrupt numbers to HW interrupt sources
is described in arch/ppc64/kernel/bpa_iic.h.

This version hardcodes the 'Spider' chip as the secondary
interrupt controller. That is not really generic for the
architecture, but at the moment it is the only secondary
PIC that exists.

A little more work will be needed on this as soon as
we have boards with multiple external interrupt controllers.

Signed-off-by: default avatarArnd Bergmann <arndb@de.ibm.com>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent fef1c772

arch/ppc64/Kconfig

+15 −0
Original line number Diff line number Diff line
@@ -110,6 +110,21 @@ config PPC_OF 
	bool

	default y



config XICS

	depends on PPC_PSERIES

	bool

	default y



config MPIC

	depends on PPC_PSERIES || PPC_PMAC || PPC_MAPLE

	bool

	default y



config BPA_IIC

	depends on PPC_BPA

	bool

	default y



# VMX is pSeries only for now until somebody writes the iSeries

# exception vectors for it

config ALTIVEC

arch/ppc64/kernel/Makefile

+5 −3
Original line number Diff line number Diff line
@@ -27,13 +27,13 @@ obj-$(CONFIG_PPC_ISERIES) += HvCall.o HvLpConfig.o LparData.o \ 
			     mf.o HvLpEvent.o iSeries_proc.o iSeries_htab.o \

			     iSeries_iommu.o



obj-$(CONFIG_PPC_MULTIPLATFORM) += nvram.o i8259.o prom_init.o prom.o mpic.o

obj-$(CONFIG_PPC_MULTIPLATFORM) += nvram.o i8259.o prom_init.o prom.o



obj-$(CONFIG_PPC_PSERIES) += pSeries_pci.o pSeries_lpar.o pSeries_hvCall.o \

			     pSeries_nvram.o rtasd.o ras.o pSeries_reconfig.o \

			     xics.o pSeries_setup.o pSeries_iommu.o

			     pSeries_setup.o pSeries_iommu.o



obj-$(CONFIG_PPC_BPA) += bpa_setup.o bpa_nvram.o

obj-$(CONFIG_PPC_BPA) += bpa_setup.o bpa_nvram.o bpa_iic.o spider-pic.o



obj-$(CONFIG_EEH)		+= eeh.o

obj-$(CONFIG_PROC_FS)		+= proc_ppc64.o
@@ -49,6 +49,8 @@ obj-$(CONFIG_HVC_CONSOLE) += hvconsole.o 
obj-$(CONFIG_BOOTX_TEXT)	+= btext.o

obj-$(CONFIG_HVCS)		+= hvcserver.o

obj-$(CONFIG_IBMVIO)		+= vio.o

obj-$(CONFIG_XICS)		+= xics.o

obj-$(CONFIG_MPIC)		+= mpic.o



obj-$(CONFIG_PPC_PMAC)		+= pmac_setup.o pmac_feature.o pmac_pci.o \

				   pmac_time.o pmac_nvram.o pmac_low_i2c.o

arch/ppc64/kernel/bpa_iic.c

0 → 100644
+270 −0
Original line number Diff line number Diff line 
/*

 * BPA Internal Interrupt Controller

 *

 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005

 *

 * Author: Arnd Bergmann <arndb@de.ibm.com>

 *

 * 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, 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., 675 Mass Ave, Cambridge, MA 02139, USA.

 */



#include <linux/config.h>

#include <linux/interrupt.h>

#include <linux/irq.h>

#include <linux/percpu.h>

#include <linux/types.h>



#include <asm/io.h>

#include <asm/pgtable.h>

#include <asm/prom.h>

#include <asm/ptrace.h>



#include "bpa_iic.h"



struct iic_pending_bits {

	u32 data;

	u8 flags;

	u8 class;

	u8 source;

	u8 prio;

};



enum iic_pending_flags {

	IIC_VALID = 0x80,

	IIC_IPI   = 0x40,

};



struct iic_regs {

	struct iic_pending_bits pending;

	struct iic_pending_bits pending_destr;

	u64 generate;

	u64 prio;

};



struct iic {

	struct iic_regs __iomem *regs;

};



static DEFINE_PER_CPU(struct iic, iic);



void iic_local_enable(void)

{

	out_be64(&__get_cpu_var(iic).regs->prio, 0xff);

}



void iic_local_disable(void)

{

	out_be64(&__get_cpu_var(iic).regs->prio, 0x0);

}



static unsigned int iic_startup(unsigned int irq)

{

	return 0;

}



static void iic_enable(unsigned int irq)

{

	iic_local_enable();

}



static void iic_disable(unsigned int irq)

{

}



static void iic_end(unsigned int irq)

{

	iic_local_enable();

}



static struct hw_interrupt_type iic_pic = {

	.typename = " BPA-IIC  ",

	.startup = iic_startup,

	.enable = iic_enable,

	.disable = iic_disable,

	.end = iic_end,

};



static int iic_external_get_irq(struct iic_pending_bits pending)

{

	int irq;

	unsigned char node, unit;



	node = pending.source >> 4;

	unit = pending.source & 0xf;

	irq = -1;



	/*

	 * This mapping is specific to the Broadband

	 * Engine. We might need to get the numbers

	 * from the device tree to support future CPUs.

	 */

	switch (unit) {

	case 0x00:

	case 0x0b:

		/*

		 * One of these units can be connected

		 * to an external interrupt controller.

		 */

		if (pending.prio > 0x3f ||

		    pending.class != 2)

			break;

		irq = IIC_EXT_OFFSET

			+ spider_get_irq(pending.prio + node * IIC_NODE_STRIDE)

			+ node * IIC_NODE_STRIDE;

		break;

	case 0x01 ... 0x04:

	case 0x07 ... 0x0a:

		/*

		 * These units are connected to the SPEs

		 */

		if (pending.class > 2)

			break;

		irq = IIC_SPE_OFFSET

			+ pending.class * IIC_CLASS_STRIDE

			+ node * IIC_NODE_STRIDE

			+ unit;

		break;

	}

	if (irq == -1)

		printk(KERN_WARNING "Unexpected interrupt class %02x, "

			"source %02x, prio %02x, cpu %02x\n", pending.class,

			pending.source, pending.prio, smp_processor_id());

	return irq;

}



/* Get an IRQ number from the pending state register of the IIC */

int iic_get_irq(struct pt_regs *regs)

{

	struct iic *iic;

	int irq;

	struct iic_pending_bits pending;



	iic = &__get_cpu_var(iic);

	*(unsigned long *) &pending = 

		in_be64((unsigned long __iomem *) &iic->regs->pending_destr);



	irq = -1;

	if (pending.flags & IIC_VALID) {

		if (pending.flags & IIC_IPI) {

			irq = IIC_IPI_OFFSET + (pending.prio >> 4);

/*

			if (irq > 0x80)

				printk(KERN_WARNING "Unexpected IPI prio %02x"

					"on CPU %02x\n", pending.prio,

							smp_processor_id());

*/

		} else {

			irq = iic_external_get_irq(pending);

		}

	}

	return irq;

}



static struct iic_regs __iomem *find_iic(int cpu)

{

	struct device_node *np;

	int nodeid = cpu / 2;

	unsigned long regs;

	struct iic_regs __iomem *iic_regs;



	for (np = of_find_node_by_type(NULL, "cpu");

	     np;

	     np = of_find_node_by_type(np, "cpu")) {

		if (nodeid == *(int *)get_property(np, "node-id", NULL))

			break;

	}



	if (!np) {

		printk(KERN_WARNING "IIC: CPU %d not found\n", cpu);

		iic_regs = NULL;

	} else {

		regs = *(long *)get_property(np, "iic", NULL);



		/* hack until we have decided on the devtree info */

		regs += 0x400;

		if (cpu & 1)

			regs += 0x20;



		printk(KERN_DEBUG "IIC for CPU %d at %lx\n", cpu, regs);

		iic_regs = __ioremap(regs, sizeof(struct iic_regs),

						 _PAGE_NO_CACHE);

	}

	return iic_regs;

}



#ifdef CONFIG_SMP

void iic_setup_cpu(void)

{

	out_be64(&__get_cpu_var(iic).regs->prio, 0xff);

}



void iic_cause_IPI(int cpu, int mesg)

{

	out_be64(&per_cpu(iic, cpu).regs->generate, mesg);

}



static irqreturn_t iic_ipi_action(int irq, void *dev_id, struct pt_regs *regs)

{



	smp_message_recv(irq - IIC_IPI_OFFSET, regs);

	return IRQ_HANDLED;

}



static void iic_request_ipi(int irq, const char *name)

{

	/* IPIs are marked SA_INTERRUPT as they must run with irqs

	 * disabled */

	get_irq_desc(irq)->handler = &iic_pic;

	get_irq_desc(irq)->status |= IRQ_PER_CPU;

	request_irq(irq, iic_ipi_action, SA_INTERRUPT, name, NULL);

}



void iic_request_IPIs(void)

{

	iic_request_ipi(IIC_IPI_OFFSET + PPC_MSG_CALL_FUNCTION, "IPI-call");

	iic_request_ipi(IIC_IPI_OFFSET + PPC_MSG_RESCHEDULE, "IPI-resched");

#ifdef CONFIG_DEBUGGER

	iic_request_ipi(IIC_IPI_OFFSET + PPC_MSG_DEBUGGER_BREAK, "IPI-debug");

#endif /* CONFIG_DEBUGGER */

}

#endif /* CONFIG_SMP */



static void iic_setup_spe_handlers(void)

{

	int be, isrc;



	/* Assume two threads per BE are present */

	for (be=0; be < num_present_cpus() / 2; be++) {

		for (isrc = 0; isrc < IIC_CLASS_STRIDE * 3; isrc++) {

			int irq = IIC_NODE_STRIDE * be + IIC_SPE_OFFSET + isrc;

			get_irq_desc(irq)->handler = &iic_pic;

		}

	}

}



void iic_init_IRQ(void)

{

	int cpu, irq_offset;

	struct iic *iic;



	irq_offset = 0;

	for_each_cpu(cpu) {

		iic = &per_cpu(iic, cpu);

		iic->regs = find_iic(cpu);

		if (iic->regs)

			out_be64(&iic->regs->prio, 0xff);

	}

	iic_setup_spe_handlers();

}

arch/ppc64/kernel/bpa_iic.h

0 → 100644
+62 −0
Original line number Diff line number Diff line 
#ifndef ASM_BPA_IIC_H

#define ASM_BPA_IIC_H

#ifdef __KERNEL__

/*

 * Mapping of IIC pending bits into per-node

 * interrupt numbers.

 *

 * IRQ     FF CC SS PP   FF CC SS PP	Description

 *

 * 00-3f   80 02 +0 00 - 80 02 +0 3f	South Bridge

 * 00-3f   80 02 +b 00 - 80 02 +b 3f	South Bridge

 * 41-4a   80 00 +1 ** - 80 00 +a **	SPU Class 0

 * 51-5a   80 01 +1 ** - 80 01 +a **	SPU Class 1

 * 61-6a   80 02 +1 ** - 80 02 +a **	SPU Class 2

 * 70-7f   C0 ** ** 00 - C0 ** ** 0f	IPI

 *

 *    F flags

 *    C class

 *    S source

 *    P Priority

 *    + node number

 *    * don't care

 *

 * A node consists of a Broadband Engine and an optional

 * south bridge device providing a maximum of 64 IRQs.

 * The south bridge may be connected to either IOIF0

 * or IOIF1.

 * Each SPE is represented as three IRQ lines, one per

 * interrupt class.

 * 16 IRQ numbers are reserved for inter processor

 * interruptions, although these are only used in the

 * range of the first node.

 *

 * This scheme needs 128 IRQ numbers per BIF node ID,

 * which means that with the total of 512 lines

 * available, we can have a maximum of four nodes.

 */



enum {

	IIC_EXT_OFFSET   = 0x00, /* Start of south bridge IRQs */

	IIC_NUM_EXT      = 0x40, /* Number of south bridge IRQs */

	IIC_SPE_OFFSET   = 0x40, /* Start of SPE interrupts */

	IIC_CLASS_STRIDE = 0x10, /* SPE IRQs per class    */

	IIC_IPI_OFFSET   = 0x70, /* Start of IPI IRQs */

	IIC_NUM_IPIS     = 0x10, /* IRQs reserved for IPI */

	IIC_NODE_STRIDE  = 0x80, /* Total IRQs per node   */

};



extern void iic_init_IRQ(void);

extern int  iic_get_irq(struct pt_regs *regs);

extern void iic_cause_IPI(int cpu, int mesg);

extern void iic_request_IPIs(void);

extern void iic_setup_cpu(void);

extern void iic_local_enable(void);

extern void iic_local_disable(void);





extern void spider_init_IRQ(void);

extern int spider_get_irq(unsigned long int_pending);



#endif

#endif /* ASM_BPA_IIC_H */

arch/ppc64/kernel/bpa_setup.c

+5 −1
Original line number Diff line number Diff line
@@ -45,6 +45,7 @@ 
#include <asm/cputable.h>



#include "pci.h"

#include "bpa_iic.h"



#ifdef DEBUG

#define DBG(fmt...) udbg_printf(fmt)
@@ -71,6 +72,9 @@ static void bpa_progress(char *s, unsigned short hex) 


static void __init bpa_setup_arch(void)

{

	ppc_md.init_IRQ       = iic_init_IRQ;

	ppc_md.get_irq        = iic_get_irq;



#ifdef CONFIG_SMP

	smp_init_pSeries();

#endif
@@ -86,7 +90,7 @@ static void __init bpa_setup_arch(void) 
	/* Find and initialize PCI host bridges */

	init_pci_config_tokens();

	find_and_init_phbs();



	spider_init_IRQ();

#ifdef CONFIG_DUMMY_CONSOLE

	conswitchp = &dummy_con;

#endif

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