/*
* External Interrupt Controller on Spider South Bridge
*
* (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/interrupt.h>
#include <linux/irq.h>
#include <asm/pgtable.h>
#include <asm/prom.h>
#include <asm/io.h>
#include "bpa_iic.h"
/* register layout taken from Spider spec, table 7.4-4 */
enum {
TIR_DEN = 0x004, /* Detection Enable Register */
TIR_MSK = 0x084, /* Mask Level Register */
TIR_EDC = 0x0c0, /* Edge Detection Clear Register */
TIR_PNDA = 0x100, /* Pending Register A */
TIR_PNDB = 0x104, /* Pending Register B */
TIR_CS = 0x144, /* Current Status Register */
TIR_LCSA = 0x150, /* Level Current Status Register A */
TIR_LCSB = 0x154, /* Level Current Status Register B */
TIR_LCSC = 0x158, /* Level Current Status Register C */
TIR_LCSD = 0x15c, /* Level Current Status Register D */
TIR_CFGA = 0x200, /* Setting Register A0 */
TIR_CFGB = 0x204, /* Setting Register B0 */
/* 0x208 ... 0x3ff Setting Register An/Bn */
TIR_PPNDA = 0x400, /* Packet Pending Register A */
TIR_PPNDB = 0x404, /* Packet Pending Register B */
TIR_PIERA = 0x408, /* Packet Output Error Register A */
TIR_PIERB = 0x40c, /* Packet Output Error Register B */
TIR_PIEN = 0x444, /* Packet Output Enable Register */
TIR_PIPND = 0x454, /* Packet Output Pending Register */
TIRDID = 0x484, /* Spider Device ID Register */
REISTIM = 0x500, /* Reissue Command Timeout Time Setting */
REISTIMEN = 0x504, /* Reissue Command Timeout Setting */
REISWAITEN = 0x508, /* Reissue Wait Control*/
};
static void __iomem *spider_pics[4];
static void __iomem *spider_get_pic(int irq)
{
int node = irq / IIC_NODE_STRIDE;
irq %= IIC_NODE_STRIDE;
if (irq >= IIC_EXT_OFFSET &&
irq < IIC_EXT_OFFSET + IIC_NUM_EXT &&
spider_pics)
return spider_pics[node];
return NULL;
}
static int spider_get_nr(unsigned int irq)
{
return (irq % IIC_NODE_STRIDE) - IIC_EXT_OFFSET;
}
static void __iomem *spider_get_irq_config(int irq)
{
void __iomem *pic;
pic = spider_get_pic(irq);
return pic + TIR_CFGA + 8 * spider_get_nr(irq);
}
static void spider_enable_irq(unsigned int irq)
{
void __iomem *cfg = spider_get_irq_config(irq);
irq = spider_get_nr(irq);
out_be32(cfg, in_be32(cfg) | 0x3107000eu);
out_be32(cfg + 4, in_be32(cfg + 4) | 0x00020000u | irq);
}
static void spider_disable_irq(unsigned int irq)
{
void __iomem *cfg = spider_get_irq_config(irq);
irq = spider_get_nr(irq);
out_be32(cfg, in_be32(cfg) & ~0x30000000u);
}
static unsigned int spider_startup_irq(unsigned int irq)
{
spider_enable_irq(irq);
return 0;
}
static void spider_shutdown_irq(unsigned int irq)
{
spider_disable_irq(irq);
}
static void spider_end_irq(unsigned int irq)
{
spider_enable_irq(irq);
}
static void spider_ack_irq(unsigned int irq)
{
spider_disable_irq(irq);
iic_local_enable();
}
static struct hw_interrupt_type spider_pic = {
.typename = " SPIDER ",
.startup = spider_startup_irq,
.shutdown = spider_shutdown_irq,
.enable = spider_enable_irq,
.disable = spider_disable_irq,
.ack = spider_ack_irq,
.end = spider_end_irq,
};
int spider_get_irq(unsigned long int_pending)
{
void __iomem *regs = spider_get_pic(int_pending);
unsigned long cs;
int irq;
cs = in_be32(regs + TIR_CS);
irq = cs >> 24;
if (irq != 63)
return irq;
return -1;
}
void spider_init_IRQ(void)
{
int node;
struct device_node *dn;
unsigned int *property;
long spiderpic;
int n;
/* FIXME: detect multiple PICs as soon as the device tree has them */
for (node = 0; node < 1; node++) {
dn = of_find_node_by_path("/");
n = prom_n_addr_cells(dn);
property = (unsigned int *) get_property(dn,
"platform-spider-pic", NULL);
if (!property)
continue;
for (spiderpic = 0; n > 0; --n)
spiderpic = (spiderpic << 32) + *property++;
printk(KERN_DEBUG "SPIDER addr: %lx\n", spiderpic);
spider_pics[node] = __ioremap(spiderpic, 0x800, _PAGE_NO_CACHE);
for (n = 0; n < IIC_NUM_EXT; n++) {
int irq = n + IIC_EXT_OFFSET + node * IIC_NODE_STRIDE;
get_irq_desc(irq)->handler = &spider_pic;
/* do not mask any interrupts because of level */
out_be32(spider_pics[node] + TIR_MSK, 0x0);
/* disable edge detection clear */
/* out_be32(spider_pics[node] + TIR_EDC, 0x0); */
/* enable interrupt packets to be output */
out_be32(spider_pics[node] + TIR_PIEN,
in_be32(spider_pics[node] + TIR_PIEN) | 0x1);
/* Enable the interrupt detection enable bit. Do this last! */
out_be32(spider_pics[node] + TIR_DEN,
in_be32(spider_pics[node] +TIR_DEN) | 0x1);
}
}
}
