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|
/*
* arch/ppc/kernel/mv64360_pic.c
*
* Interrupt controller support for Marvell's MV64360.
*
* Author: Rabeeh Khoury <rabeeh@galileo.co.il>
* Based on MV64360 PIC written by
* Chris Zankel <chris@mvista.com>
* Mark A. Greer <mgreer@mvista.com>
*
* Copyright 2004 MontaVista Software, Inc.
*
* 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 file contains the specific functions to support the MV64360
* interrupt controller.
*
* The MV64360 has two main interrupt registers (high and low) that
* summarizes the interrupts generated by the units of the MV64360.
* Each bit is assigned to an interrupt number, where the low register
* are assigned from IRQ0 to IRQ31 and the high cause register
* from IRQ32 to IRQ63
* The GPP (General Purpose Pins) interrupts are assigned from IRQ64 (GPP0)
* to IRQ95 (GPP31).
* get_irq() returns the lowest interrupt number that is currently asserted.
*
* Note:
* - This driver does not initialize the GPP when used as an interrupt
* input.
*/
#include <linux/stddef.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/signal.h>
#include <linux/stddef.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/irq.h>
#include <asm/mv64x60.h>
#ifdef CONFIG_IRQ_ALL_CPUS
#error "The mv64360 does not support distribution of IRQs on all CPUs"
#endif
/* ========================== forward declaration ========================== */
static void mv64360_unmask_irq(unsigned int);
static void mv64360_mask_irq(unsigned int);
static irqreturn_t mv64360_cpu_error_int_handler(int, void *, struct pt_regs *);
static irqreturn_t mv64360_sram_error_int_handler(int, void *,
struct pt_regs *);
static irqreturn_t mv64360_pci_error_int_handler(int, void *, struct pt_regs *);
/* ========================== local declarations =========================== */
struct hw_interrupt_type mv64360_pic = {
.typename = " mv64360 ",
.enable = mv64360_unmask_irq,
.disable = mv64360_mask_irq,
.ack = mv64360_mask_irq,
.end = mv64360_unmask_irq,
};
#define CPU_INTR_STR "mv64360 cpu interface error"
#define SRAM_INTR_STR "mv64360 internal sram error"
#define PCI0_INTR_STR "mv64360 pci 0 error"
#define PCI1_INTR_STR "mv64360 pci 1 error"
static struct mv64x60_handle bh;
u32 mv64360_irq_base = 0; /* MV64360 handles the next 96 IRQs from here */
/* mv64360_init_irq()
*
* This function initializes the interrupt controller. It assigns
* all interrupts from IRQ0 to IRQ95 to the mv64360 interrupt controller.
*
* Input Variable(s):
* None.
*
* Outpu. Variable(s):
* None.
*
* Returns:
* void
*
* Note:
* We register all GPP inputs as interrupt source, but disable them.
*/
void __init
mv64360_init_irq(void)
{
int i;
if (ppc_md.progress)
ppc_md.progress("mv64360_init_irq: enter", 0x0);
bh.v_base = mv64x60_get_bridge_vbase();
ppc_cached_irq_mask[0] = 0;
ppc_cached_irq_mask[1] = 0x0f000000; /* Enable GPP intrs */
ppc_cached_irq_mask[2] = 0;
/* disable all interrupts and clear current interrupts */
mv64x60_write(&bh, MV64x60_GPP_INTR_CAUSE, 0);
mv64x60_write(&bh, MV64x60_GPP_INTR_MASK, ppc_cached_irq_mask[2]);
mv64x60_write(&bh, MV64360_IC_CPU0_INTR_MASK_LO,ppc_cached_irq_mask[0]);
mv64x60_write(&bh, MV64360_IC_CPU0_INTR_MASK_HI,ppc_cached_irq_mask[1]);
/* All interrupts are level interrupts */
for (i = mv64360_irq_base; i < (mv64360_irq_base + 96); i++) {
irq_desc[i].status |= IRQ_LEVEL;
irq_desc[i].handler = &mv64360_pic;
}
if (ppc_md.progress)
ppc_md.progress("mv64360_init_irq: exit", 0x0);
}
/* mv64360_get_irq()
*
* This function returns the lowest interrupt number of all interrupts that
* are currently asserted.
*
* Input Variable(s):
* struct pt_regs* not used
*
* Output Variable(s):
* None.
*
* Returns:
* int <interrupt number> or -2 (bogus interrupt)
*
*/
int
mv64360_get_irq(struct pt_regs *regs)
{
int irq;
int irq_gpp;
#ifdef CONFIG_SMP
/*
* Second CPU gets only doorbell (message) interrupts.
* The doorbell interrupt is BIT28 in the main interrupt low cause reg.
*/
int cpu_nr = smp_processor_id();
if (cpu_nr == 1) {
if (!(mv64x60_read(&bh, MV64360_IC_MAIN_CAUSE_LO) &
(1 << MV64x60_IRQ_DOORBELL)))
return -1;
return mv64360_irq_base + MV64x60_IRQ_DOORBELL;
}
#endif
irq = mv64x60_read(&bh, MV64360_IC_MAIN_CAUSE_LO);
irq = __ilog2((irq & 0x3dfffffe) & ppc_cached_irq_mask[0]);
if (irq == -1) {
irq = mv64x60_read(&bh, MV64360_IC_MAIN_CAUSE_HI);
irq = __ilog2((irq & 0x1f0003f7) & ppc_cached_irq_mask[1]);
if (irq == -1)
irq = -2; /* bogus interrupt, should never happen */
else {
if ((irq >= 24) && (irq < MV64x60_IRQ_DOORBELL)) {
irq_gpp = mv64x60_read(&bh,
MV64x60_GPP_INTR_CAUSE);
irq_gpp = __ilog2(irq_gpp &
ppc_cached_irq_mask[2]);
if (irq_gpp == -1)
irq = -2;
else {
irq = irq_gpp + 64;
mv64x60_write(&bh,
MV64x60_GPP_INTR_CAUSE,
~(1 << (irq - 64)));
}
}
else
irq += 32;
}
}
(void)mv64x60_read(&bh, MV64x60_GPP_INTR_CAUSE);
if (irq < 0)
return (irq);
else
return (mv64360_irq_base + irq);
}
/* mv64360_unmask_irq()
*
* This function enables an interrupt.
*
* Input Variable(s):
* unsigned int interrupt number (IRQ0...IRQ95).
*
* Output Variable(s):
* None.
*
* Returns:
* void
*/
static void
mv64360_unmask_irq(unsigned int irq)
{
#ifdef CONFIG_SMP
/* second CPU gets only doorbell interrupts */
if ((irq - mv64360_irq_base) == MV64x60_IRQ_DOORBELL) {
mv64x60_set_bits(&bh, MV64360_IC_CPU1_INTR_MASK_LO,
(1 << MV64x60_IRQ_DOORBELL));
return;
}
#endif
irq -= mv64360_irq_base;
if (irq > 31) {
if (irq > 63) /* unmask GPP irq */
mv64x60_write(&bh, MV64x60_GPP_INTR_MASK,
ppc_cached_irq_mask[2] |= (1 << (irq - 64)));
else /* mask high interrupt register */
mv64x60_write(&bh, MV64360_IC_CPU0_INTR_MASK_HI,
ppc_cached_irq_mask[1] |= (1 << (irq - 32)));
}
else /* mask low interrupt register */
mv64x60_write(&bh, MV64360_IC_CPU0_INTR_MASK_LO,
ppc_cached_irq_mask[0] |= (1 << irq));
(void)mv64x60_read(&bh, MV64x60_GPP_INTR_MASK);
return;
}
/* mv64360_mask_irq()
*
* This function disables the requested interrupt.
*
* Input Variable(s):
* unsigned int interrupt number (IRQ0...IRQ95).
*
* Output Variable(s):
* None.
*
* Returns:
* void
*/
static void
mv64360_mask_irq(unsigned int irq)
{
#ifdef CONFIG_SMP
if ((irq - mv64360_irq_base) == MV64x60_IRQ_DOORBELL) {
mv64x60_clr_bits(&bh, MV64360_IC_CPU1_INTR_MASK_LO,
(1 << MV64x60_IRQ_DOORBELL));
return;
}
#endif
irq -= mv64360_irq_base;
if (irq > 31) {
if (irq > 63) /* mask GPP irq */
mv64x60_write(&bh, MV64x60_GPP_INTR_MASK,
ppc_cached_irq_mask[2] &= ~(1 << (irq - 64)));
else /* mask high interrupt register */
mv64x60_write(&bh, MV64360_IC_CPU0_INTR_MASK_HI,
ppc_cached_irq_mask[1] &= ~(1 << (irq - 32)));
}
else /* mask low interrupt register */
mv64x60_write(&bh, MV64360_IC_CPU0_INTR_MASK_LO,
ppc_cached_irq_mask[0] &= ~(1 << irq));
(void)mv64x60_read(&bh, MV64x60_GPP_INTR_MASK);
return;
}
static irqreturn_t
mv64360_cpu_error_int_handler(int irq, void *dev_id, struct pt_regs *regs)
{
printk(KERN_ERR "mv64360_cpu_error_int_handler: %s 0x%08x\n",
"Error on CPU interface - Cause regiser",
mv64x60_read(&bh, MV64x60_CPU_ERR_CAUSE));
printk(KERN_ERR "\tCPU error register dump:\n");
printk(KERN_ERR "\tAddress low 0x%08x\n",
mv64x60_read(&bh, MV64x60_CPU_ERR_ADDR_LO));
printk(KERN_ERR "\tAddress high 0x%08x\n",
mv64x60_read(&bh, MV64x60_CPU_ERR_ADDR_HI));
printk(KERN_ERR "\tData low 0x%08x\n",
mv64x60_read(&bh, MV64x60_CPU_ERR_DATA_LO));
printk(KERN_ERR "\tData high 0x%08x\n",
mv64x60_read(&bh, MV64x60_CPU_ERR_DATA_HI));
printk(KERN_ERR "\tParity 0x%08x\n",
mv64x60_read(&bh, MV64x60_CPU_ERR_PARITY));
mv64x60_write(&bh, MV64x60_CPU_ERR_CAUSE, 0);
return IRQ_HANDLED;
}
static irqreturn_t
mv64360_sram_error_int_handler(int irq, void *dev_id, struct pt_regs *regs)
{
printk(KERN_ERR "mv64360_sram_error_int_handler: %s 0x%08x\n",
"Error in internal SRAM - Cause register",
mv64x60_read(&bh, MV64360_SRAM_ERR_CAUSE));
printk(KERN_ERR "\tSRAM error register dump:\n");
printk(KERN_ERR "\tAddress Low 0x%08x\n",
mv64x60_read(&bh, MV64360_SRAM_ERR_ADDR_LO));
printk(KERN_ERR "\tAddress High 0x%08x\n",
mv64x60_read(&bh, MV64360_SRAM_ERR_ADDR_HI));
printk(KERN_ERR "\tData Low 0x%08x\n",
mv64x60_read(&bh, MV64360_SRAM_ERR_DATA_LO));
printk(KERN_ERR "\tData High 0x%08x\n",
mv64x60_read(&bh, MV64360_SRAM_ERR_DATA_HI));
printk(KERN_ERR "\tParity 0x%08x\n",
mv64x60_read(&bh, MV64360_SRAM_ERR_PARITY));
mv64x60_write(&bh, MV64360_SRAM_ERR_CAUSE, 0);
return IRQ_HANDLED;
}
static irqreturn_t
mv64360_pci_error_int_handler(int irq, void *dev_id, struct pt_regs *regs)
{
u32 val;
unsigned int pci_bus = (unsigned int)dev_id;
if (pci_bus == 0) { /* Error on PCI 0 */
val = mv64x60_read(&bh, MV64x60_PCI0_ERR_CAUSE);
printk(KERN_ERR "%s: Error in PCI %d Interface\n",
"mv64360_pci_error_int_handler", pci_bus);
printk(KERN_ERR "\tPCI %d error register dump:\n", pci_bus);
printk(KERN_ERR "\tCause register 0x%08x\n", val);
printk(KERN_ERR "\tAddress Low 0x%08x\n",
mv64x60_read(&bh, MV64x60_PCI0_ERR_ADDR_LO));
printk(KERN_ERR "\tAddress High 0x%08x\n",
mv64x60_read(&bh, MV64x60_PCI0_ERR_ADDR_HI));
printk(KERN_ERR "\tAttribute 0x%08x\n",
mv64x60_read(&bh, MV64x60_PCI0_ERR_DATA_LO));
printk(KERN_ERR "\tCommand 0x%08x\n",
mv64x60_read(&bh, MV64x60_PCI0_ERR_CMD));
mv64x60_write(&bh, MV64x60_PCI0_ERR_CAUSE, ~val);
}
if (pci_bus == 1) { /* Error on PCI 1 */
val = mv64x60_read(&bh, MV64x60_PCI1_ERR_CAUSE);
printk(KERN_ERR "%s: Error in PCI %d Interface\n",
"mv64360_pci_error_int_handler", pci_bus);
printk(KERN_ERR "\tPCI %d error register dump:\n", pci_bus);
printk(KERN_ERR "\tCause register 0x%08x\n", val);
printk(KERN_ERR "\tAddress Low 0x%08x\n",
mv64x60_read(&bh, MV64x60_PCI1_ERR_ADDR_LO));
printk(KERN_ERR "\tAddress High 0x%08x\n",
mv64x60_read(&bh, MV64x60_PCI1_ERR_ADDR_HI));
printk(KERN_ERR "\tAttribute 0x%08x\n",
mv64x60_read(&bh, MV64x60_PCI1_ERR_DATA_LO));
printk(KERN_ERR "\tCommand 0x%08x\n",
mv64x60_read(&bh, MV64x60_PCI1_ERR_CMD));
mv64x60_write(&bh, MV64x60_PCI1_ERR_CAUSE, ~val);
}
return IRQ_HANDLED;
}
/*
* Bit 0 of MV64x60_PCIx_ERR_MASK does not exist on the 64360 and because of
* errata FEr-#11 and FEr-##16 for the 64460, it should be 0 on that chip as
* well. IOW, don't set bit 0.
*/
#define MV64360_PCI0_ERR_MASK_VAL 0x00a50c24
static int __init
mv64360_register_hdlrs(void)
{
int rc;
/* Clear old errors and register CPU interface error intr handler */
mv64x60_write(&bh, MV64x60_CPU_ERR_CAUSE, 0);
if ((rc = request_irq(MV64x60_IRQ_CPU_ERR + mv64360_irq_base,
mv64360_cpu_error_int_handler, SA_INTERRUPT, CPU_INTR_STR, 0)))
printk(KERN_WARNING "Can't register cpu error handler: %d", rc);
mv64x60_write(&bh, MV64x60_CPU_ERR_MASK, 0);
mv64x60_write(&bh, MV64x60_CPU_ERR_MASK, 0x000000ff);
/* Clear old errors and register internal SRAM error intr handler */
mv64x60_write(&bh, MV64360_SRAM_ERR_CAUSE, 0);
if ((rc = request_irq(MV64360_IRQ_SRAM_PAR_ERR + mv64360_irq_base,
mv64360_sram_error_int_handler,SA_INTERRUPT,SRAM_INTR_STR, 0)))
printk(KERN_WARNING "Can't register SRAM error handler: %d",rc);
/* Clear old errors and register PCI 0 error intr handler */
mv64x60_write(&bh, MV64x60_PCI0_ERR_CAUSE, 0);
if ((rc = request_irq(MV64360_IRQ_PCI0 + mv64360_irq_base,
mv64360_pci_error_int_handler,
SA_INTERRUPT, PCI0_INTR_STR, (void *)0)))
printk(KERN_WARNING "Can't register pci 0 error handler: %d",
rc);
mv64x60_write(&bh, MV64x60_PCI0_ERR_MASK, 0);
mv64x60_write(&bh, MV64x60_PCI0_ERR_MASK, MV64360_PCI0_ERR_MASK_VAL);
/* Erratum FEr PCI-#16 says to clear bit 0 of PCI SERRn Mask reg. */
mv64x60_write(&bh, MV64x60_PCI0_ERR_SERR_MASK,
mv64x60_read(&bh, MV64x60_PCI0_ERR_SERR_MASK) & ~0x1UL);
/* Clear old errors and register PCI 1 error intr handler */
mv64x60_write(&bh, MV64x60_PCI1_ERR_CAUSE, 0);
if ((rc = request_irq(MV64360_IRQ_PCI1 + mv64360_irq_base,
mv64360_pci_error_int_handler,
SA_INTERRUPT, PCI1_INTR_STR, (void *)1)))
printk(KERN_WARNING "Can't register pci 1 error handler: %d",
rc);
mv64x60_write(&bh, MV64x60_PCI1_ERR_MASK, 0);
mv64x60_write(&bh, MV64x60_PCI1_ERR_MASK, MV64360_PCI0_ERR_MASK_VAL);
/* Erratum FEr PCI-#16 says to clear bit 0 of PCI Intr Mask reg. */
mv64x60_write(&bh, MV64x60_PCI1_ERR_SERR_MASK,
mv64x60_read(&bh, MV64x60_PCI1_ERR_SERR_MASK) & ~0x1UL);
return 0;
}
arch_initcall(mv64360_register_hdlrs);
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