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linux/arch/powerpc/sysdev/mpc52xx_pic.c
Nicolas DET 0f6c95dcab [PATCH] Add MPC5200 Interrupt Controller support. 
This adds support for the MPC52xx Interrupt controller for
ARCH=powerpc.

It includes the main code in arch/powerpc/sysdev/ as well as a header
file in include/asm-powerpc.

Signed-off-by: Nicolas DET <nd@bplan-gmbh.de>
Acked-by: Sylvain Munaut <tnt@246tNt.com>
Acked-by: Grant Likely <grant.likely@secretlab.ca>
Signed-off-by: Paul Mackerras <paulus@samba.org>
2006-11-13 14:45:02 +11:00

539 lines
12 KiB
C
Raw Blame History

/*
*
* Programmable Interrupt Controller functions for the Freescale MPC52xx.
*
* Copyright (C) 2006 bplan GmbH
*
* Based on the code from the 2.4 kernel by
* Dale Farnsworth <dfarnsworth@mvista.com> and Kent Borg.
*
* Copyright (C) 2004 Sylvain Munaut <tnt@246tNt.com>
* Copyright (C) 2003 Montavista Software, Inc
*
* This file is licensed under the terms of the GNU General Public License
* version 2. This program is licensed "as is" without any warranty of any
* kind, whether express or implied.
*
*/
#undef DEBUG
#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/hardirq.h>
#include <asm/io.h>
#include <asm/processor.h>
#include <asm/system.h>
#include <asm/irq.h>
#include <asm/prom.h>
#include <asm/mpc52xx.h>
/*
*
*/
static struct mpc52xx_intr __iomem *intr;
static struct mpc52xx_sdma __iomem *sdma;
static struct irq_host *mpc52xx_irqhost = NULL;
static unsigned char mpc52xx_map_senses[4] = {
IRQ_TYPE_LEVEL_HIGH,
IRQ_TYPE_EDGE_RISING,
IRQ_TYPE_EDGE_FALLING,
IRQ_TYPE_LEVEL_LOW,
};
/*
*
*/
static inline void io_be_setbit(u32 __iomem * addr, int bitno)
{
out_be32(addr, in_be32(addr) | (1 << bitno));
}
static inline void io_be_clrbit(u32 __iomem * addr, int bitno)
{
out_be32(addr, in_be32(addr) & ~(1 << bitno));
}
/*
* IRQ[0-3] interrupt irq_chip
*/
static void mpc52xx_extirq_mask(unsigned int virq)
{
int irq;
int l2irq;
irq = irq_map[virq].hwirq;
l2irq = (irq & MPC52xx_IRQ_L2_MASK) >> MPC52xx_IRQ_L2_OFFSET;
pr_debug("%s: irq=%x. l2=%d\n", __func__, irq, l2irq);
io_be_clrbit(&intr->ctrl, 11 - l2irq);
}
static void mpc52xx_extirq_unmask(unsigned int virq)
{
int irq;
int l2irq;
irq = irq_map[virq].hwirq;
l2irq = (irq & MPC52xx_IRQ_L2_MASK) >> MPC52xx_IRQ_L2_OFFSET;
pr_debug("%s: irq=%x. l2=%d\n", __func__, irq, l2irq);
io_be_setbit(&intr->ctrl, 11 - l2irq);
}
static void mpc52xx_extirq_ack(unsigned int virq)
{
int irq;
int l2irq;
irq = irq_map[virq].hwirq;
l2irq = (irq & MPC52xx_IRQ_L2_MASK) >> MPC52xx_IRQ_L2_OFFSET;
pr_debug("%s: irq=%x. l2=%d\n", __func__, irq, l2irq);
io_be_setbit(&intr->ctrl, 27 - l2irq);
}
static struct irq_chip mpc52xx_extirq_irqchip = {
.typename = " MPC52xx IRQ[0-3] ",
.mask = mpc52xx_extirq_mask,
.unmask = mpc52xx_extirq_unmask,
.ack = mpc52xx_extirq_ack,
};
/*
* Main interrupt irq_chip
*/
static void mpc52xx_main_mask(unsigned int virq)
{
int irq;
int l2irq;
irq = irq_map[virq].hwirq;
l2irq = (irq & MPC52xx_IRQ_L2_MASK) >> MPC52xx_IRQ_L2_OFFSET;
pr_debug("%s: irq=%x. l2=%d\n", __func__, irq, l2irq);
io_be_setbit(&intr->main_mask, 15 - l2irq);
}
static void mpc52xx_main_unmask(unsigned int virq)
{
int irq;
int l2irq;
irq = irq_map[virq].hwirq;
l2irq = (irq & MPC52xx_IRQ_L2_MASK) >> MPC52xx_IRQ_L2_OFFSET;
pr_debug("%s: irq=%x. l2=%d\n", __func__, irq, l2irq);
io_be_clrbit(&intr->main_mask, 15 - l2irq);
}
static struct irq_chip mpc52xx_main_irqchip = {
.typename = "MPC52xx Main",
.mask = mpc52xx_main_mask,
.mask_ack = mpc52xx_main_mask,
.unmask = mpc52xx_main_unmask,
};
/*
* Peripherals interrupt irq_chip
*/
static void mpc52xx_periph_mask(unsigned int virq)
{
int irq;
int l2irq;
irq = irq_map[virq].hwirq;
l2irq = (irq & MPC52xx_IRQ_L2_MASK) >> MPC52xx_IRQ_L2_OFFSET;
pr_debug("%s: irq=%x. l2=%d\n", __func__, irq, l2irq);
io_be_setbit(&intr->per_mask, 31 - l2irq);
}
static void mpc52xx_periph_unmask(unsigned int virq)
{
int irq;
int l2irq;
irq = irq_map[virq].hwirq;
l2irq = (irq & MPC52xx_IRQ_L2_MASK) >> MPC52xx_IRQ_L2_OFFSET;
pr_debug("%s: irq=%x. l2=%d\n", __func__, irq, l2irq);
io_be_clrbit(&intr->per_mask, 31 - l2irq);
}
static struct irq_chip mpc52xx_periph_irqchip = {
.typename = "MPC52xx Peripherals",
.mask = mpc52xx_periph_mask,
.mask_ack = mpc52xx_periph_mask,
.unmask = mpc52xx_periph_unmask,
};
/*
* SDMA interrupt irq_chip
*/
static void mpc52xx_sdma_mask(unsigned int virq)
{
int irq;
int l2irq;
irq = irq_map[virq].hwirq;
l2irq = (irq & MPC52xx_IRQ_L2_MASK) >> MPC52xx_IRQ_L2_OFFSET;
pr_debug("%s: irq=%x. l2=%d\n", __func__, irq, l2irq);
io_be_setbit(&sdma->IntMask, l2irq);
}
static void mpc52xx_sdma_unmask(unsigned int virq)
{
int irq;
int l2irq;
irq = irq_map[virq].hwirq;
l2irq = (irq & MPC52xx_IRQ_L2_MASK) >> MPC52xx_IRQ_L2_OFFSET;
pr_debug("%s: irq=%x. l2=%d\n", __func__, irq, l2irq);
io_be_clrbit(&sdma->IntMask, l2irq);
}
static void mpc52xx_sdma_ack(unsigned int virq)
{
int irq;
int l2irq;
irq = irq_map[virq].hwirq;
l2irq = (irq & MPC52xx_IRQ_L2_MASK) >> MPC52xx_IRQ_L2_OFFSET;
pr_debug("%s: irq=%x. l2=%d\n", __func__, irq, l2irq);
out_be32(&sdma->IntPend, 1 << l2irq);
}
static struct irq_chip mpc52xx_sdma_irqchip = {
.typename = "MPC52xx SDMA",
.mask = mpc52xx_sdma_mask,
.unmask = mpc52xx_sdma_unmask,
.ack = mpc52xx_sdma_ack,
};
/*
* irq_host
*/
static int mpc52xx_irqhost_match(struct irq_host *h, struct device_node *node)
{
pr_debug("%s: node=%p\n", __func__, node);
return mpc52xx_irqhost->host_data == node;
}
static int mpc52xx_irqhost_xlate(struct irq_host *h, struct device_node *ct,
u32 * intspec, unsigned int intsize,
irq_hw_number_t * out_hwirq,
unsigned int *out_flags)
{
int intrvect_l1;
int intrvect_l2;
int intrvect_type;
int intrvect_linux;
if (intsize != 3)
return -1;
intrvect_l1 = (int)intspec[0];
intrvect_l2 = (int)intspec[1];
intrvect_type = (int)intspec[2];
intrvect_linux =
(intrvect_l1 << MPC52xx_IRQ_L1_OFFSET) & MPC52xx_IRQ_L1_MASK;
intrvect_linux |=
(intrvect_l2 << MPC52xx_IRQ_L2_OFFSET) & MPC52xx_IRQ_L2_MASK;
pr_debug("return %x, l1=%d, l2=%d\n", intrvect_linux, intrvect_l1,
intrvect_l2);
*out_hwirq = intrvect_linux;
*out_flags = mpc52xx_map_senses[intrvect_type];
return 0;
}
/*
* this function retrieves the correct IRQ type out
* of the MPC regs
* Only externals IRQs needs this
*/
static int mpc52xx_irqx_gettype(int irq)
{
int type;
u32 ctrl_reg;
ctrl_reg = in_be32(&intr->ctrl);
type = (ctrl_reg >> (22 - irq * 2)) & 0x3;
return mpc52xx_map_senses[type];
}
static int mpc52xx_irqhost_map(struct irq_host *h, unsigned int virq,
irq_hw_number_t irq)
{
int l1irq;
int l2irq;
struct irq_chip *good_irqchip;
void *good_handle;
int type;
l1irq = (irq & MPC52xx_IRQ_L1_MASK) >> MPC52xx_IRQ_L1_OFFSET;
l2irq = (irq & MPC52xx_IRQ_L2_MASK) >> MPC52xx_IRQ_L2_OFFSET;
/*
* Most of ours IRQs will be level low
* Only external IRQs on some platform may be others
*/
type = IRQ_TYPE_LEVEL_LOW;
switch (l1irq) {
case MPC52xx_IRQ_L1_CRIT:
pr_debug("%s: Critical. l2=%x\n", __func__, l2irq);
BUG_ON(l2irq != 0);
type = mpc52xx_irqx_gettype(l2irq);
good_irqchip = &mpc52xx_extirq_irqchip;
break;
case MPC52xx_IRQ_L1_MAIN:
pr_debug("%s: Main IRQ[1-3] l2=%x\n", __func__, l2irq);
if ((l2irq >= 1) && (l2irq <= 3)) {
type = mpc52xx_irqx_gettype(l2irq);
good_irqchip = &mpc52xx_extirq_irqchip;
} else {
good_irqchip = &mpc52xx_main_irqchip;
}
break;
case MPC52xx_IRQ_L1_PERP:
pr_debug("%s: Peripherals. l2=%x\n", __func__, l2irq);
good_irqchip = &mpc52xx_periph_irqchip;
break;
case MPC52xx_IRQ_L1_SDMA:
pr_debug("%s: SDMA. l2=%x\n", __func__, l2irq);
good_irqchip = &mpc52xx_sdma_irqchip;
break;
default:
pr_debug("%s: Error, unknown L1 IRQ (0x%x)\n", __func__, l1irq);
printk(KERN_ERR "Unknow IRQ!\n");
return -EINVAL;
}
switch (type) {
case IRQ_TYPE_EDGE_FALLING:
case IRQ_TYPE_EDGE_RISING:
good_handle = handle_edge_irq;
break;
default:
good_handle = handle_level_irq;
}
set_irq_chip_and_handler(virq, good_irqchip, good_handle);
pr_debug("%s: virq=%x, hw=%x. type=%x\n", __func__, virq,
(int)irq, type);
return 0;
}
static struct irq_host_ops mpc52xx_irqhost_ops = {
.match = mpc52xx_irqhost_match,
.xlate = mpc52xx_irqhost_xlate,
.map = mpc52xx_irqhost_map,
};
/*
* init (public)
*/
void __init mpc52xx_init_irq(void)
{
struct device_node *picnode = NULL;
int picnode_regsize;
u32 picnode_regoffset;
struct device_node *sdmanode = NULL;
int sdmanode_regsize;
u32 sdmanode_regoffset;
u64 size64;
int flags;
u32 intr_ctrl;
picnode = of_find_compatible_node(NULL, "interrupt-controller",
"mpc5200-pic");
if (picnode == NULL) {
printk(KERN_ERR "MPC52xx PIC: "
"Unable to find the interrupt controller "
"in the OpenFirmware device tree\n");
goto end;
}
sdmanode = of_find_compatible_node(NULL, "dma-controller",
"mpc5200-bestcomm");
if (sdmanode == NULL) {
printk(KERN_ERR "MPC52xx PIC"
"Unable to find the Bestcomm DMA controller device "
"in the OpenFirmware device tree\n");
goto end;
}
/* Retrieve PIC ressources */
picnode_regoffset = (u32) of_get_address(picnode, 0, &size64, &flags);
if (picnode_regoffset == 0) {
printk(KERN_ERR "MPC52xx PIC"
"Unable to get the interrupt controller address\n");
goto end;
}
picnode_regoffset =
of_translate_address(picnode, (u32 *) picnode_regoffset);
picnode_regsize = (int)size64;
/* Retrieve SDMA ressources */
sdmanode_regoffset = (u32) of_get_address(sdmanode, 0, &size64, &flags);
if (sdmanode_regoffset == 0) {
printk(KERN_ERR "MPC52xx PIC: "
"Unable to get the Bestcomm DMA controller address\n");
goto end;
}
sdmanode_regoffset =
of_translate_address(sdmanode, (u32 *) sdmanode_regoffset);
sdmanode_regsize = (int)size64;
/* Remap the necessary zones */
intr = ioremap(picnode_regoffset, picnode_regsize);
if (intr == NULL) {
printk(KERN_ERR "MPC52xx PIC: "
"Unable to ioremap interrupt controller registers!\n");
goto end;
}
sdma = ioremap(sdmanode_regoffset, sdmanode_regsize);
if (sdma == NULL) {
iounmap(intr);
printk(KERN_ERR "MPC52xx PIC: "
"Unable to ioremap Bestcomm DMA registers!\n");
goto end;
}
printk(KERN_INFO "MPC52xx PIC: MPC52xx PIC Remapped at 0x%8.8x\n",
picnode_regoffset);
printk(KERN_INFO "MPC52xx PIC: MPC52xx SDMA Remapped at 0x%8.8x\n",
sdmanode_regoffset);
/* Disable all interrupt sources. */
out_be32(&sdma->IntPend, 0xffffffff); /* 1 means clear pending */
out_be32(&sdma->IntMask, 0xffffffff); /* 1 means disabled */
out_be32(&intr->per_mask, 0x7ffffc00); /* 1 means disabled */
out_be32(&intr->main_mask, 0x00010fff); /* 1 means disabled */
intr_ctrl = in_be32(&intr->ctrl);
intr_ctrl &= 0x00ff0000; /* Keeps IRQ[0-3] config */
intr_ctrl |= 0x0f000000 | /* clear IRQ 0-3 */
0x00001000 | /* MEE master external enable */
0x00000000 | /* 0 means disable IRQ 0-3 */
0x00000001; /* CEb route critical normally */
out_be32(&intr->ctrl, intr_ctrl);
/* Zero a bunch of the priority settings. */
out_be32(&intr->per_pri1, 0);
out_be32(&intr->per_pri2, 0);
out_be32(&intr->per_pri3, 0);
out_be32(&intr->main_pri1, 0);
out_be32(&intr->main_pri2, 0);
/*
* As last step, add an irq host to translate the real
* hw irq information provided by the ofw to linux virq
*/
mpc52xx_irqhost =
irq_alloc_host(IRQ_HOST_MAP_LINEAR, MPC52xx_IRQ_HIGHTESTHWIRQ,
&mpc52xx_irqhost_ops, -1);
if (mpc52xx_irqhost) {
mpc52xx_irqhost->host_data = picnode;
printk(KERN_INFO "MPC52xx PIC is up and running!\n");
} else {
printk(KERN_ERR
"MPC52xx PIC: Unable to allocate the IRQ host\n");
}
end:
of_node_put(picnode);
of_node_put(sdmanode);
}
/*
* get_irq (public)
*/
unsigned int mpc52xx_get_irq(void)
{
u32 status;
int irq = NO_IRQ_IGNORE;
status = in_be32(&intr->enc_status);
if (status & 0x00000400) { /* critical */
irq = (status >> 8) & 0x3;
if (irq == 2) /* high priority peripheral */
goto peripheral;
irq |= (MPC52xx_IRQ_L1_CRIT << MPC52xx_IRQ_L1_OFFSET) &
MPC52xx_IRQ_L1_MASK;
} else if (status & 0x00200000) { /* main */
irq = (status >> 16) & 0x1f;
if (irq == 4) /* low priority peripheral */
goto peripheral;
irq |= (MPC52xx_IRQ_L1_MAIN << MPC52xx_IRQ_L1_OFFSET) &
MPC52xx_IRQ_L1_MASK;
} else if (status & 0x20000000) { /* peripheral */
peripheral:
irq = (status >> 24) & 0x1f;
if (irq == 0) { /* bestcomm */
status = in_be32(&sdma->IntPend);
irq = ffs(status) - 1;
irq |= (MPC52xx_IRQ_L1_SDMA << MPC52xx_IRQ_L1_OFFSET) &
MPC52xx_IRQ_L1_MASK;
} else
irq |= (MPC52xx_IRQ_L1_PERP << MPC52xx_IRQ_L1_OFFSET) &
MPC52xx_IRQ_L1_MASK;
}
pr_debug("%s: irq=%x. virq=%d\n", __func__, irq,
irq_linear_revmap(mpc52xx_irqhost, irq));
return irq_linear_revmap(mpc52xx_irqhost, irq);
}
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