android_kernel_xiaomi_sm8350/arch/ppc64/kernel/bpa_iic.c
Arnd Bergmann f3f66f599d [PATCH] powerpc: Rename BPA to Cell
The official name for BPA is now CBEA (Cell Broadband
Engine Architecture). This patch renames all occurences
of the term BPA to 'Cell' for easier recognition.

Signed-off-by: Arnd Bergmann <arndb@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
2005-11-01 21:02:44 +11:00

285 lines
6.1 KiB
C

/*
* Cell Internal Interrupt Controller
*
* (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/config.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/percpu.h>
#include <linux/types.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/prom.h>
#include <asm/ptrace.h>
#include "interrupt.h"
struct iic_pending_bits {
u32 data;
u8 flags;
u8 class;
u8 source;
u8 prio;
};
enum iic_pending_flags {
IIC_VALID = 0x80,
IIC_IPI = 0x40,
};
struct iic_regs {
struct iic_pending_bits pending;
struct iic_pending_bits pending_destr;
u64 generate;
u64 prio;
};
struct iic {
struct iic_regs __iomem *regs;
};
static DEFINE_PER_CPU(struct iic, iic);
void iic_local_enable(void)
{
out_be64(&__get_cpu_var(iic).regs->prio, 0xff);
}
void iic_local_disable(void)
{
out_be64(&__get_cpu_var(iic).regs->prio, 0x0);
}
static unsigned int iic_startup(unsigned int irq)
{
return 0;
}
static void iic_enable(unsigned int irq)
{
iic_local_enable();
}
static void iic_disable(unsigned int irq)
{
}
static void iic_end(unsigned int irq)
{
iic_local_enable();
}
static struct hw_interrupt_type iic_pic = {
.typename = " CELL-IIC ",
.startup = iic_startup,
.enable = iic_enable,
.disable = iic_disable,
.end = iic_end,
};
static int iic_external_get_irq(struct iic_pending_bits pending)
{
int irq;
unsigned char node, unit;
node = pending.source >> 4;
unit = pending.source & 0xf;
irq = -1;
/*
* This mapping is specific to the Cell Broadband
* Engine. We might need to get the numbers
* from the device tree to support future CPUs.
*/
switch (unit) {
case 0x00:
case 0x0b:
/*
* One of these units can be connected
* to an external interrupt controller.
*/
if (pending.prio > 0x3f ||
pending.class != 2)
break;
irq = IIC_EXT_OFFSET
+ spider_get_irq(pending.prio + node * IIC_NODE_STRIDE)
+ node * IIC_NODE_STRIDE;
break;
case 0x01 ... 0x04:
case 0x07 ... 0x0a:
/*
* These units are connected to the SPEs
*/
if (pending.class > 2)
break;
irq = IIC_SPE_OFFSET
+ pending.class * IIC_CLASS_STRIDE
+ node * IIC_NODE_STRIDE
+ unit;
break;
}
if (irq == -1)
printk(KERN_WARNING "Unexpected interrupt class %02x, "
"source %02x, prio %02x, cpu %02x\n", pending.class,
pending.source, pending.prio, smp_processor_id());
return irq;
}
/* Get an IRQ number from the pending state register of the IIC */
int iic_get_irq(struct pt_regs *regs)
{
struct iic *iic;
int irq;
struct iic_pending_bits pending;
iic = &__get_cpu_var(iic);
*(unsigned long *) &pending =
in_be64((unsigned long __iomem *) &iic->regs->pending_destr);
irq = -1;
if (pending.flags & IIC_VALID) {
if (pending.flags & IIC_IPI) {
irq = IIC_IPI_OFFSET + (pending.prio >> 4);
/*
if (irq > 0x80)
printk(KERN_WARNING "Unexpected IPI prio %02x"
"on CPU %02x\n", pending.prio,
smp_processor_id());
*/
} else {
irq = iic_external_get_irq(pending);
}
}
return irq;
}
static struct iic_regs __iomem *find_iic(int cpu)
{
struct device_node *np;
int nodeid = cpu / 2;
unsigned long regs;
struct iic_regs __iomem *iic_regs;
for (np = of_find_node_by_type(NULL, "cpu");
np;
np = of_find_node_by_type(np, "cpu")) {
if (nodeid == *(int *)get_property(np, "node-id", NULL))
break;
}
if (!np) {
printk(KERN_WARNING "IIC: CPU %d not found\n", cpu);
iic_regs = NULL;
} else {
regs = *(long *)get_property(np, "iic", NULL);
/* hack until we have decided on the devtree info */
regs += 0x400;
if (cpu & 1)
regs += 0x20;
printk(KERN_DEBUG "IIC for CPU %d at %lx\n", cpu, regs);
iic_regs = __ioremap(regs, sizeof(struct iic_regs),
_PAGE_NO_CACHE);
}
return iic_regs;
}
#ifdef CONFIG_SMP
/* Use the highest interrupt priorities for IPI */
static inline int iic_ipi_to_irq(int ipi)
{
return IIC_IPI_OFFSET + IIC_NUM_IPIS - 1 - ipi;
}
static inline int iic_irq_to_ipi(int irq)
{
return IIC_NUM_IPIS - 1 - (irq - IIC_IPI_OFFSET);
}
void iic_setup_cpu(void)
{
out_be64(&__get_cpu_var(iic).regs->prio, 0xff);
}
void iic_cause_IPI(int cpu, int mesg)
{
out_be64(&per_cpu(iic, cpu).regs->generate, (IIC_NUM_IPIS - 1 - mesg) << 4);
}
static irqreturn_t iic_ipi_action(int irq, void *dev_id, struct pt_regs *regs)
{
smp_message_recv(iic_irq_to_ipi(irq), regs);
return IRQ_HANDLED;
}
static void iic_request_ipi(int ipi, const char *name)
{
int irq;
irq = iic_ipi_to_irq(ipi);
/* IPIs are marked SA_INTERRUPT as they must run with irqs
* disabled */
get_irq_desc(irq)->handler = &iic_pic;
get_irq_desc(irq)->status |= IRQ_PER_CPU;
request_irq(irq, iic_ipi_action, SA_INTERRUPT, name, NULL);
}
void iic_request_IPIs(void)
{
iic_request_ipi(PPC_MSG_CALL_FUNCTION, "IPI-call");
iic_request_ipi(PPC_MSG_RESCHEDULE, "IPI-resched");
#ifdef CONFIG_DEBUGGER
iic_request_ipi(PPC_MSG_DEBUGGER_BREAK, "IPI-debug");
#endif /* CONFIG_DEBUGGER */
}
#endif /* CONFIG_SMP */
static void iic_setup_spe_handlers(void)
{
int be, isrc;
/* Assume two threads per BE are present */
for (be=0; be < num_present_cpus() / 2; be++) {
for (isrc = 0; isrc < IIC_CLASS_STRIDE * 3; isrc++) {
int irq = IIC_NODE_STRIDE * be + IIC_SPE_OFFSET + isrc;
get_irq_desc(irq)->handler = &iic_pic;
}
}
}
void iic_init_IRQ(void)
{
int cpu, irq_offset;
struct iic *iic;
irq_offset = 0;
for_each_cpu(cpu) {
iic = &per_cpu(iic, cpu);
iic->regs = find_iic(cpu);
if (iic->regs)
out_be64(&iic->regs->prio, 0xff);
}
iic_setup_spe_handlers();
}