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MN10300: ASB2364: Handle the IRQ multiplexer in the FPGA 

Handle the IRQ multiplexer in the FPGA by implementing a cascade interrupt
driver for it.

Signed-off-by: David Howells <dhowells@redhat.com>
This commit is contained in:
David Howells 2010-10-27 17:28:58 +01:00
parent 730c1fad0e
commit 6044cf1d94
7 changed files with 165 additions and 18 deletions
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12
arch/mn10300/include/asm/irq.h
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@ -21,11 +21,15 @@
/* this number is used when no interrupt has been assigned */
#define NO_IRQ INT_MAX
/* hardware irq numbers */
#ifdef CONFIG_SMP
#define NR_IRQS GxICR_NUM_EXT_IRQS
/*
* hardware irq numbers
* - the ASB2364 has an FPGA with an IRQ multiplexer on it
*/
#ifdef CONFIG_MN10300_UNIT_ASB2364
#include <unit/irq.h>
#else
#define NR_IRQS GxICR_NUM_IRQS
#define NR_CPU_IRQS GxICR_NUM_IRQS
#define NR_IRQS NR_CPU_IRQS
#endif
/* external hardware irq numbers */

13
arch/mn10300/kernel/irq.c
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@ -381,9 +381,16 @@ int show_interrupts(struct seq_file *p, void *v)
seq_printf(p, "%3d: ", i);
for_each_present_cpu(cpu)
seq_printf(p, "%10u ", kstat_irqs_cpu(i, cpu));
seq_printf(p, " %14s.%u", irq_desc[i].chip->name,
(GxICR(i) & GxICR_LEVEL) >>
GxICR_LEVEL_SHIFT);
if (i < NR_CPU_IRQS)
seq_printf(p, " %14s.%u",
irq_desc[i].chip->name,
(GxICR(i) & GxICR_LEVEL) >>
GxICR_LEVEL_SHIFT);
else
seq_printf(p, " %14s",
irq_desc[i].chip->name);
seq_printf(p, " %s", action->name);
for (action = action->next;

2
arch/mn10300/unit-asb2364/Makefile
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@ -7,4 +7,4 @@
#
# Note 2! The CFLAGS definitions are now in the main makefile...
obj-y := unit-init.o leds.o
obj-y := unit-init.o leds.o irq-fpga.o

22
arch/mn10300/unit-asb2364/include/unit/fpga-regs.h
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@ -14,17 +14,19 @@
#define ASB2364_FPGA_REG_RESET_USB __SYSREG(0xa900130c, u16)
#define ASB2364_FPGA_REG_RESET_AV __SYSREG(0xa9001310, u16)
#define ASB2364_FPGA_REG_IRQ_LAN __SYSREG(0xa9001510, u16)
#define ASB2364_FPGA_REG_IRQ_UART __SYSREG(0xa9001514, u16)
#define ASB2364_FPGA_REG_IRQ_I2C __SYSREG(0xa9001518, u16)
#define ASB2364_FPGA_REG_IRQ_USB __SYSREG(0xa900151c, u16)
#define ASB2364_FPGA_REG_IRQ_FPGA __SYSREG(0xa9001524, u16)
#define ASB2364_FPGA_REG_IRQ(X) __SYSREG(0xa9001590+((X)*4), u16)
#define ASB2364_FPGA_REG_IRQ_LAN ASB2364_FPGA_REG_IRQ(0)
#define ASB2364_FPGA_REG_IRQ_UART ASB2364_FPGA_REG_IRQ(1)
#define ASB2364_FPGA_REG_IRQ_I2C ASB2364_FPGA_REG_IRQ(2)
#define ASB2364_FPGA_REG_IRQ_USB ASB2364_FPGA_REG_IRQ(3)
#define ASB2364_FPGA_REG_IRQ_FPGA ASB2364_FPGA_REG_IRQ(5)
#define ASB2364_FPGA_REG_MASK_LAN __SYSREG(0xa9001590, u16)
#define ASB2364_FPGA_REG_MASK_UART __SYSREG(0xa9001594, u16)
#define ASB2364_FPGA_REG_MASK_I2C __SYSREG(0xa9001598, u16)
#define ASB2364_FPGA_REG_MASK_USB __SYSREG(0xa900159c, u16)
#define ASB2364_FPGA_REG_MASK_FPGA __SYSREG(0xa90015a4, u16)
#define ASB2364_FPGA_REG_MASK(X) __SYSREG(0xa9001590+((X)*4), u16)
#define ASB2364_FPGA_REG_MASK_LAN ASB2364_FPGA_REG_MASK(0)
#define ASB2364_FPGA_REG_MASK_UART ASB2364_FPGA_REG_MASK(1)
#define ASB2364_FPGA_REG_MASK_I2C ASB2364_FPGA_REG_MASK(2)
#define ASB2364_FPGA_REG_MASK_USB ASB2364_FPGA_REG_MASK(3)
#define ASB2364_FPGA_REG_MASK_FPGA ASB2364_FPGA_REG_MASK(5)
#define ASB2364_FPGA_REG_CPLD5_SET1 __SYSREG(0xa9002500, u16)
#define ASB2364_FPGA_REG_CPLD5_SET2 __SYSREG(0xa9002504, u16)

35
arch/mn10300/unit-asb2364/include/unit/irq.h Normal file
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@ -0,0 +1,35 @@
/* ASB2364 FPGA irq numbers
*
* Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#ifndef _UNIT_IRQ_H
#define _UNIT_IRQ_H
#ifndef __ASSEMBLY__
#ifdef CONFIG_SMP
#define NR_CPU_IRQS GxICR_NUM_EXT_IRQS
#else
#define NR_CPU_IRQS GxICR_NUM_IRQS
#endif
enum {
FPGA_LAN_IRQ = NR_CPU_IRQS,
FPGA_UART_IRQ,
FPGA_I2C_IRQ,
FPGA_USB_IRQ,
FPGA_RESERVED_IRQ,
FPGA_FPGA_IRQ,
NR_IRQS
};
extern void __init irq_fpga_init(void);
#endif /* !__ASSEMBLY__ */
#endif /* _UNIT_IRQ_H */

96
arch/mn10300/unit-asb2364/irq-fpga.c Normal file
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@ -0,0 +1,96 @@
/* ASB2364 FPGA interrupt multiplexing
*
* Copyright (C) 2010 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public Licence
* as published by the Free Software Foundation; either version
* 2 of the Licence, or (at your option) any later version.
*/
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <unit/fpga-regs.h>
/*
* FPGA PIC operations
*/
static void asb2364_fpga_mask(unsigned int irq)
{
ASB2364_FPGA_REG_MASK(irq - NR_CPU_IRQS) = 0x0001;
SyncExBus();
}
static void asb2364_fpga_ack(unsigned int irq)
{
ASB2364_FPGA_REG_IRQ(irq - NR_CPU_IRQS) = 0x0001;
SyncExBus();
}
static void asb2364_fpga_mask_ack(unsigned int irq)
{
ASB2364_FPGA_REG_MASK(irq - NR_CPU_IRQS) = 0x0001;
SyncExBus();
ASB2364_FPGA_REG_IRQ(irq - NR_CPU_IRQS) = 0x0001;
SyncExBus();
}
static void asb2364_fpga_unmask(unsigned int irq)
{
ASB2364_FPGA_REG_MASK(irq - NR_CPU_IRQS) = 0x0000;
SyncExBus();
}
static struct irq_chip asb2364_fpga_pic = {
.name = "fpga",
.ack = asb2364_fpga_ack,
.mask = asb2364_fpga_mask,
.mask_ack = asb2364_fpga_mask_ack,
.unmask = asb2364_fpga_unmask,
};
/*
* FPGA PIC interrupt handler
*/
static irqreturn_t fpga_interrupt(int irq, void *_mask)
{
if ((ASB2364_FPGA_REG_IRQ_LAN & 0x0001) != 0x0001)
generic_handle_irq(FPGA_LAN_IRQ);
if ((ASB2364_FPGA_REG_IRQ_UART & 0x0001) != 0x0001)
generic_handle_irq(FPGA_UART_IRQ);
if ((ASB2364_FPGA_REG_IRQ_I2C & 0x0001) != 0x0001)
generic_handle_irq(FPGA_I2C_IRQ);
if ((ASB2364_FPGA_REG_IRQ_USB & 0x0001) != 0x0001)
generic_handle_irq(FPGA_USB_IRQ);
if ((ASB2364_FPGA_REG_IRQ_FPGA & 0x0001) != 0x0001)
generic_handle_irq(FPGA_FPGA_IRQ);
return IRQ_HANDLED;
}
/*
* Define an interrupt action for each FPGA PIC output
*/
static struct irqaction fpga_irq[] = {
[0] = {
.handler = fpga_interrupt,
.flags = IRQF_DISABLED | IRQF_SHARED,
.name = "fpga",
},
};
/*
* Initialise the FPGA's PIC
*/
void __init irq_fpga_init(void)
{
int irq;
for (irq = NR_CPU_IRQS; irq < NR_IRQS; irq++)
set_irq_chip_and_handler(irq, &asb2364_fpga_pic, handle_level_irq);
/* the FPGA drives the XIRQ1 input on the CPU PIC */
setup_irq(XIRQ1, &fpga_irq[0]);
}

3
arch/mn10300/unit-asb2364/unit-init.c
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@ -20,6 +20,7 @@
#include <asm/processor.h>
#include <asm/irq.h>
#include <asm/intctl-regs.h>
#include <unit/fpga-regs.h>
/*
* initialise some of the unit hardware before gdbstub is set up
@ -82,4 +83,6 @@ void __init unit_init_IRQ(void)
#define IRQCTL __SYSREG(0xd5000090, u32)
IRQCTL |= 0x02;
irq_fpga_init();
}