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m68knommu: create a speciailized ColdFire 5272 interrupt controller
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The ColdFire 5272 CPU has a very different interrupt controller than
any of the other ColdFire parts. It needs its own controller code to
correctly setup and ack interrupts.

Signed-off-by: Greg Ungerer <[email protected]>
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@gregungerer
gregungerer committed Sep 15, 2009
1 parent da3601a commit 9075216
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Showing 4 changed files with 174 additions and 5 deletions.
37 changes: 34 additions & 3 deletions arch/m68k/include/asm/m5272sim.h
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Expand Up @@ -12,7 +12,6 @@
#define m5272sim_h
/****************************************************************************/


/*
* Define the 5272 SIM register set addresses.
*/
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/*
* Define system peripheral IRQ usage.
*/
#define MCF_IRQ_TIMER 69 /* Timer0, Level 6 */
#define MCF_IRQ_PROFILER 70 /* Timer1, Level 7 */
#define MCFINT_VECBASE 64 /* Base of interrupts */
#define MCF_IRQ_SPURIOUS 64 /* User Spurious */
#define MCF_IRQ_EINT1 65 /* External Interrupt 1 */
#define MCF_IRQ_EINT2 66 /* External Interrupt 2 */
#define MCF_IRQ_EINT3 67 /* External Interrupt 3 */
#define MCF_IRQ_EINT4 68 /* External Interrupt 4 */
#define MCF_IRQ_TIMER1 69 /* Timer 1 */
#define MCF_IRQ_TIMER2 70 /* Timer 2 */
#define MCF_IRQ_TIMER3 71 /* Timer 3 */
#define MCF_IRQ_TIMER4 72 /* Timer 4 */
#define MCF_IRQ_UART1 73 /* UART 1 */
#define MCF_IRQ_UART2 74 /* UART 2 */
#define MCF_IRQ_PLIP 75 /* PLIC 2Khz Periodic */
#define MCF_IRQ_PLIA 76 /* PLIC Asynchronous */
#define MCF_IRQ_USB0 77 /* USB Endpoint 0 */
#define MCF_IRQ_USB1 78 /* USB Endpoint 1 */
#define MCF_IRQ_USB2 79 /* USB Endpoint 2 */
#define MCF_IRQ_USB3 80 /* USB Endpoint 3 */
#define MCF_IRQ_USB4 81 /* USB Endpoint 4 */
#define MCF_IRQ_USB5 82 /* USB Endpoint 5 */
#define MCF_IRQ_USB6 83 /* USB Endpoint 6 */
#define MCF_IRQ_USB7 84 /* USB Endpoint 7 */
#define MCF_IRQ_DMA 85 /* DMA Controller */
#define MCF_IRQ_ERX 86 /* Ethernet Receiver */
#define MCF_IRQ_ETX 87 /* Ethernet Transmitter */
#define MCF_IRQ_ENTC 88 /* Ethernet Non-Time Critical */
#define MCF_IRQ_QSPI 89 /* Queued Serial Interface */
#define MCF_IRQ_EINT5 90 /* External Interrupt 5 */
#define MCF_IRQ_EINT6 91 /* External Interrupt 6 */
#define MCF_IRQ_SWTO 92 /* Software Watchdog */
#define MCFINT_VECMAX 95 /* Maxmum interrupt */

#define MCF_IRQ_TIMER MCF_IRQ_TIMER1
#define MCF_IRQ_PROFILER MCF_IRQ_TIMER2

/*
* Generic GPIO support
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2 changes: 1 addition & 1 deletion arch/m68knommu/platform/5272/Makefile
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Expand Up @@ -14,5 +14,5 @@

asflags-$(CONFIG_FULLDEBUG) := -DDEBUGGER_COMPATIBLE_CACHE=1

obj-y := config.o gpio.o
obj-y := config.o gpio.o intc.o

138 changes: 138 additions & 0 deletions arch/m68knommu/platform/5272/intc.c
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@@ -0,0 +1,138 @@
/*
* intc.c -- interrupt controller or ColdFire 5272 SoC
*
* (C) Copyright 2009, Greg Ungerer <[email protected]>
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*/

#include <linux/types.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <asm/coldfire.h>
#include <asm/mcfsim.h>
#include <asm/traps.h>

/*
* The 5272 ColdFire interrupt controller is nothing like any other
* ColdFire interrupt controller - it truly is completely different.
* Given its age it is unlikely to be used on any other ColdFire CPU.
*/

/*
* The masking and priproty setting of interrupts on the 5272 is done
* via a set of 4 "Interrupt Controller Registers" (ICR). There is a
* loose mapping of vector number to register and internal bits, but
* a table is the easiest and quickest way to map them.
*/
struct irqmap {
unsigned char icr;
unsigned char index;
unsigned char ack;
};

static struct irqmap intc_irqmap[MCFINT_VECMAX - MCFINT_VECBASE] = {
/*MCF_IRQ_SPURIOUS*/ { .icr = 0, .index = 0, .ack = 0, },
/*MCF_IRQ_EINT1*/ { .icr = MCFSIM_ICR1, .index = 28, .ack = 1, },
/*MCF_IRQ_EINT2*/ { .icr = MCFSIM_ICR1, .index = 24, .ack = 1, },
/*MCF_IRQ_EINT3*/ { .icr = MCFSIM_ICR1, .index = 20, .ack = 1, },
/*MCF_IRQ_EINT4*/ { .icr = MCFSIM_ICR1, .index = 16, .ack = 1, },
/*MCF_IRQ_TIMER1*/ { .icr = MCFSIM_ICR1, .index = 12, .ack = 0, },
/*MCF_IRQ_TIMER2*/ { .icr = MCFSIM_ICR1, .index = 8, .ack = 0, },
/*MCF_IRQ_TIMER3*/ { .icr = MCFSIM_ICR1, .index = 4, .ack = 0, },
/*MCF_IRQ_TIMER4*/ { .icr = MCFSIM_ICR1, .index = 0, .ack = 0, },
/*MCF_IRQ_UART1*/ { .icr = MCFSIM_ICR2, .index = 28, .ack = 0, },
/*MCF_IRQ_UART2*/ { .icr = MCFSIM_ICR2, .index = 24, .ack = 0, },
/*MCF_IRQ_PLIP*/ { .icr = MCFSIM_ICR2, .index = 20, .ack = 0, },
/*MCF_IRQ_PLIA*/ { .icr = MCFSIM_ICR2, .index = 16, .ack = 0, },
/*MCF_IRQ_USB0*/ { .icr = MCFSIM_ICR2, .index = 12, .ack = 0, },
/*MCF_IRQ_USB1*/ { .icr = MCFSIM_ICR2, .index = 8, .ack = 0, },
/*MCF_IRQ_USB2*/ { .icr = MCFSIM_ICR2, .index = 4, .ack = 0, },
/*MCF_IRQ_USB3*/ { .icr = MCFSIM_ICR2, .index = 0, .ack = 0, },
/*MCF_IRQ_USB4*/ { .icr = MCFSIM_ICR3, .index = 28, .ack = 0, },
/*MCF_IRQ_USB5*/ { .icr = MCFSIM_ICR3, .index = 24, .ack = 0, },
/*MCF_IRQ_USB6*/ { .icr = MCFSIM_ICR3, .index = 20, .ack = 0, },
/*MCF_IRQ_USB7*/ { .icr = MCFSIM_ICR3, .index = 16, .ack = 0, },
/*MCF_IRQ_DMA*/ { .icr = MCFSIM_ICR3, .index = 12, .ack = 0, },
/*MCF_IRQ_ERX*/ { .icr = MCFSIM_ICR3, .index = 8, .ack = 0, },
/*MCF_IRQ_ETX*/ { .icr = MCFSIM_ICR3, .index = 4, .ack = 0, },
/*MCF_IRQ_ENTC*/ { .icr = MCFSIM_ICR3, .index = 0, .ack = 0, },
/*MCF_IRQ_QSPI*/ { .icr = MCFSIM_ICR4, .index = 28, .ack = 0, },
/*MCF_IRQ_EINT5*/ { .icr = MCFSIM_ICR4, .index = 24, .ack = 1, },
/*MCF_IRQ_EINT6*/ { .icr = MCFSIM_ICR4, .index = 20, .ack = 1, },
/*MCF_IRQ_SWTO*/ { .icr = MCFSIM_ICR4, .index = 16, .ack = 0, },
};

static void intc_irq_mask(unsigned int irq)
{
if ((irq >= MCFINT_VECBASE) && (irq <= MCFINT_VECMAX)) {
u32 v;
irq -= MCFINT_VECBASE;
v = 0x8 << intc_irqmap[irq].index;
writel(v, MCF_MBAR + intc_irqmap[irq].icr);
}
}

static void intc_irq_unmask(unsigned int irq)
{
if ((irq >= MCFINT_VECBASE) && (irq <= MCFINT_VECMAX)) {
u32 v;
irq -= MCFINT_VECBASE;
v = 0xd << intc_irqmap[irq].index;
writel(v, MCF_MBAR + intc_irqmap[irq].icr);
}
}

static void intc_irq_ack(unsigned int irq)
{
/* Only external interrupts are acked */
if ((irq >= MCFINT_VECBASE) && (irq <= MCFINT_VECMAX)) {
irq -= MCFINT_VECBASE;
if (intc_irqmap[irq].ack) {
u32 v;
v = 0xd << intc_irqmap[irq].index;
writel(v, MCF_MBAR + intc_irqmap[irq].icr);
}
}
}

static int intc_irq_set_type(unsigned int irq, unsigned int type)
{
/* We can set the edge type here for external interrupts */
return 0;
}

static struct irq_chip intc_irq_chip = {
.name = "CF-INTC",
.mask = intc_irq_mask,
.unmask = intc_irq_unmask,
.ack = intc_irq_ack,
.set_type = intc_irq_set_type,
};

void __init init_IRQ(void)
{
int irq;

init_vectors();

/* Mask all interrupt sources */
writel(0x88888888, MCF_MBAR + MCFSIM_ICR1);
writel(0x88888888, MCF_MBAR + MCFSIM_ICR2);
writel(0x88888888, MCF_MBAR + MCFSIM_ICR3);
writel(0x88888888, MCF_MBAR + MCFSIM_ICR4);

for (irq = 0; (irq < NR_IRQS); irq++) {
irq_desc[irq].status = IRQ_DISABLED;
irq_desc[irq].action = NULL;
irq_desc[irq].depth = 1;
irq_desc[irq].chip = &intc_irq_chip;
intc_irq_set_type(irq, 0);
}
}

2 changes: 1 addition & 1 deletion arch/m68knommu/platform/coldfire/Makefile
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Expand Up @@ -21,7 +21,7 @@ obj-$(CONFIG_M520x) += pit.o intc-simr.o
obj-$(CONFIG_M523x) += pit.o dma_timer.o intc-2.o
obj-$(CONFIG_M5249) += timers.o intc.o
obj-$(CONFIG_M527x) += pit.o intc-2.o
obj-$(CONFIG_M5272) += timers.o intc.o
obj-$(CONFIG_M5272) += timers.o
obj-$(CONFIG_M528x) += pit.o intc-2.o
obj-$(CONFIG_M5307) += timers.o intc.o
obj-$(CONFIG_M532x) += timers.o intc-simr.o
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