mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-16 13:26:45 +07:00
ef24ba7091
NO_IRQ has been == 0 on powerpc for just over ten years (since commit
0ebfff1491
("[POWERPC] Add new interrupt mapping core and change
platforms to use it")). It's also 0 on most other arches.
Although it's fairly harmless, every now and then it causes confusion
when a driver is built on powerpc and another arch which doesn't define
NO_IRQ. There's at least 6 definitions of NO_IRQ in drivers/, at least
some of which are to work around that problem.
So we'd like to remove it. This is fairly trivial in the arch code, we
just convert:
if (irq == NO_IRQ) to if (!irq)
if (irq != NO_IRQ) to if (irq)
irq = NO_IRQ; to irq = 0;
return NO_IRQ; to return 0;
And a few other odd cases as well.
At least for now we keep the #define NO_IRQ, because there is driver
code that uses NO_IRQ and the fixes to remove those will go via other
trees.
Note we also change some occurrences in PPC sound drivers, drivers/ps3,
and drivers/macintosh.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
299 lines
7.2 KiB
C
299 lines
7.2 KiB
C
/*
|
|
* Driver for ePAPR Embedded Hypervisor PIC
|
|
*
|
|
* Copyright 2008-2011 Freescale Semiconductor, Inc.
|
|
*
|
|
* Author: Ashish Kalra <ashish.kalra@freescale.com>
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/init.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/smp.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/smp.h>
|
|
#include <asm/machdep.h>
|
|
#include <asm/ehv_pic.h>
|
|
#include <asm/fsl_hcalls.h>
|
|
|
|
static struct ehv_pic *global_ehv_pic;
|
|
static DEFINE_SPINLOCK(ehv_pic_lock);
|
|
|
|
static u32 hwirq_intspec[NR_EHV_PIC_INTS];
|
|
static u32 __iomem *mpic_percpu_base_vaddr;
|
|
|
|
#define IRQ_TYPE_MPIC_DIRECT 4
|
|
#define MPIC_EOI 0x00B0
|
|
|
|
/*
|
|
* Linux descriptor level callbacks
|
|
*/
|
|
|
|
void ehv_pic_unmask_irq(struct irq_data *d)
|
|
{
|
|
unsigned int src = virq_to_hw(d->irq);
|
|
|
|
ev_int_set_mask(src, 0);
|
|
}
|
|
|
|
void ehv_pic_mask_irq(struct irq_data *d)
|
|
{
|
|
unsigned int src = virq_to_hw(d->irq);
|
|
|
|
ev_int_set_mask(src, 1);
|
|
}
|
|
|
|
void ehv_pic_end_irq(struct irq_data *d)
|
|
{
|
|
unsigned int src = virq_to_hw(d->irq);
|
|
|
|
ev_int_eoi(src);
|
|
}
|
|
|
|
void ehv_pic_direct_end_irq(struct irq_data *d)
|
|
{
|
|
out_be32(mpic_percpu_base_vaddr + MPIC_EOI / 4, 0);
|
|
}
|
|
|
|
int ehv_pic_set_affinity(struct irq_data *d, const struct cpumask *dest,
|
|
bool force)
|
|
{
|
|
unsigned int src = virq_to_hw(d->irq);
|
|
unsigned int config, prio, cpu_dest;
|
|
int cpuid = irq_choose_cpu(dest);
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&ehv_pic_lock, flags);
|
|
ev_int_get_config(src, &config, &prio, &cpu_dest);
|
|
ev_int_set_config(src, config, prio, cpuid);
|
|
spin_unlock_irqrestore(&ehv_pic_lock, flags);
|
|
|
|
return IRQ_SET_MASK_OK;
|
|
}
|
|
|
|
static unsigned int ehv_pic_type_to_vecpri(unsigned int type)
|
|
{
|
|
/* Now convert sense value */
|
|
|
|
switch (type & IRQ_TYPE_SENSE_MASK) {
|
|
case IRQ_TYPE_EDGE_RISING:
|
|
return EHV_PIC_INFO(VECPRI_SENSE_EDGE) |
|
|
EHV_PIC_INFO(VECPRI_POLARITY_POSITIVE);
|
|
|
|
case IRQ_TYPE_EDGE_FALLING:
|
|
case IRQ_TYPE_EDGE_BOTH:
|
|
return EHV_PIC_INFO(VECPRI_SENSE_EDGE) |
|
|
EHV_PIC_INFO(VECPRI_POLARITY_NEGATIVE);
|
|
|
|
case IRQ_TYPE_LEVEL_HIGH:
|
|
return EHV_PIC_INFO(VECPRI_SENSE_LEVEL) |
|
|
EHV_PIC_INFO(VECPRI_POLARITY_POSITIVE);
|
|
|
|
case IRQ_TYPE_LEVEL_LOW:
|
|
default:
|
|
return EHV_PIC_INFO(VECPRI_SENSE_LEVEL) |
|
|
EHV_PIC_INFO(VECPRI_POLARITY_NEGATIVE);
|
|
}
|
|
}
|
|
|
|
int ehv_pic_set_irq_type(struct irq_data *d, unsigned int flow_type)
|
|
{
|
|
unsigned int src = virq_to_hw(d->irq);
|
|
unsigned int vecpri, vold, vnew, prio, cpu_dest;
|
|
unsigned long flags;
|
|
|
|
if (flow_type == IRQ_TYPE_NONE)
|
|
flow_type = IRQ_TYPE_LEVEL_LOW;
|
|
|
|
irqd_set_trigger_type(d, flow_type);
|
|
|
|
vecpri = ehv_pic_type_to_vecpri(flow_type);
|
|
|
|
spin_lock_irqsave(&ehv_pic_lock, flags);
|
|
ev_int_get_config(src, &vold, &prio, &cpu_dest);
|
|
vnew = vold & ~(EHV_PIC_INFO(VECPRI_POLARITY_MASK) |
|
|
EHV_PIC_INFO(VECPRI_SENSE_MASK));
|
|
vnew |= vecpri;
|
|
|
|
/*
|
|
* TODO : Add specific interface call for platform to set
|
|
* individual interrupt priorities.
|
|
* platform currently using static/default priority for all ints
|
|
*/
|
|
|
|
prio = 8;
|
|
|
|
ev_int_set_config(src, vecpri, prio, cpu_dest);
|
|
|
|
spin_unlock_irqrestore(&ehv_pic_lock, flags);
|
|
return IRQ_SET_MASK_OK_NOCOPY;
|
|
}
|
|
|
|
static struct irq_chip ehv_pic_irq_chip = {
|
|
.irq_mask = ehv_pic_mask_irq,
|
|
.irq_unmask = ehv_pic_unmask_irq,
|
|
.irq_eoi = ehv_pic_end_irq,
|
|
.irq_set_type = ehv_pic_set_irq_type,
|
|
};
|
|
|
|
static struct irq_chip ehv_pic_direct_eoi_irq_chip = {
|
|
.irq_mask = ehv_pic_mask_irq,
|
|
.irq_unmask = ehv_pic_unmask_irq,
|
|
.irq_eoi = ehv_pic_direct_end_irq,
|
|
.irq_set_type = ehv_pic_set_irq_type,
|
|
};
|
|
|
|
/* Return an interrupt vector or 0 if no interrupt is pending. */
|
|
unsigned int ehv_pic_get_irq(void)
|
|
{
|
|
int irq;
|
|
|
|
BUG_ON(global_ehv_pic == NULL);
|
|
|
|
if (global_ehv_pic->coreint_flag)
|
|
irq = mfspr(SPRN_EPR); /* if core int mode */
|
|
else
|
|
ev_int_iack(0, &irq); /* legacy mode */
|
|
|
|
if (irq == 0xFFFF) /* 0xFFFF --> no irq is pending */
|
|
return 0;
|
|
|
|
/*
|
|
* this will also setup revmap[] in the slow path for the first
|
|
* time, next calls will always use fast path by indexing revmap
|
|
*/
|
|
return irq_linear_revmap(global_ehv_pic->irqhost, irq);
|
|
}
|
|
|
|
static int ehv_pic_host_match(struct irq_domain *h, struct device_node *node,
|
|
enum irq_domain_bus_token bus_token)
|
|
{
|
|
/* Exact match, unless ehv_pic node is NULL */
|
|
struct device_node *of_node = irq_domain_get_of_node(h);
|
|
return of_node == NULL || of_node == node;
|
|
}
|
|
|
|
static int ehv_pic_host_map(struct irq_domain *h, unsigned int virq,
|
|
irq_hw_number_t hw)
|
|
{
|
|
struct ehv_pic *ehv_pic = h->host_data;
|
|
struct irq_chip *chip;
|
|
|
|
/* Default chip */
|
|
chip = &ehv_pic->hc_irq;
|
|
|
|
if (mpic_percpu_base_vaddr)
|
|
if (hwirq_intspec[hw] & IRQ_TYPE_MPIC_DIRECT)
|
|
chip = &ehv_pic_direct_eoi_irq_chip;
|
|
|
|
irq_set_chip_data(virq, chip);
|
|
/*
|
|
* using handle_fasteoi_irq as our irq handler, this will
|
|
* only call the eoi callback and suitable for the MPIC
|
|
* controller which set ISR/IPR automatically and clear the
|
|
* highest priority active interrupt in ISR/IPR when we do
|
|
* a specific eoi
|
|
*/
|
|
irq_set_chip_and_handler(virq, chip, handle_fasteoi_irq);
|
|
|
|
/* Set default irq type */
|
|
irq_set_irq_type(virq, IRQ_TYPE_NONE);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ehv_pic_host_xlate(struct irq_domain *h, struct device_node *ct,
|
|
const u32 *intspec, unsigned int intsize,
|
|
irq_hw_number_t *out_hwirq, unsigned int *out_flags)
|
|
|
|
{
|
|
/*
|
|
* interrupt sense values coming from the guest device tree
|
|
* interrupt specifiers can have four possible sense and
|
|
* level encoding information and they need to
|
|
* be translated between firmware type & linux type.
|
|
*/
|
|
|
|
static unsigned char map_of_senses_to_linux_irqtype[4] = {
|
|
IRQ_TYPE_EDGE_FALLING,
|
|
IRQ_TYPE_EDGE_RISING,
|
|
IRQ_TYPE_LEVEL_LOW,
|
|
IRQ_TYPE_LEVEL_HIGH,
|
|
};
|
|
|
|
*out_hwirq = intspec[0];
|
|
if (intsize > 1) {
|
|
hwirq_intspec[intspec[0]] = intspec[1];
|
|
*out_flags = map_of_senses_to_linux_irqtype[intspec[1] &
|
|
~IRQ_TYPE_MPIC_DIRECT];
|
|
} else {
|
|
*out_flags = IRQ_TYPE_NONE;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct irq_domain_ops ehv_pic_host_ops = {
|
|
.match = ehv_pic_host_match,
|
|
.map = ehv_pic_host_map,
|
|
.xlate = ehv_pic_host_xlate,
|
|
};
|
|
|
|
void __init ehv_pic_init(void)
|
|
{
|
|
struct device_node *np, *np2;
|
|
struct ehv_pic *ehv_pic;
|
|
int coreint_flag = 1;
|
|
|
|
np = of_find_compatible_node(NULL, NULL, "epapr,hv-pic");
|
|
if (!np) {
|
|
pr_err("ehv_pic_init: could not find epapr,hv-pic node\n");
|
|
return;
|
|
}
|
|
|
|
if (!of_find_property(np, "has-external-proxy", NULL))
|
|
coreint_flag = 0;
|
|
|
|
ehv_pic = kzalloc(sizeof(struct ehv_pic), GFP_KERNEL);
|
|
if (!ehv_pic) {
|
|
of_node_put(np);
|
|
return;
|
|
}
|
|
|
|
ehv_pic->irqhost = irq_domain_add_linear(np, NR_EHV_PIC_INTS,
|
|
&ehv_pic_host_ops, ehv_pic);
|
|
if (!ehv_pic->irqhost) {
|
|
of_node_put(np);
|
|
kfree(ehv_pic);
|
|
return;
|
|
}
|
|
|
|
np2 = of_find_compatible_node(NULL, NULL, "fsl,hv-mpic-per-cpu");
|
|
if (np2) {
|
|
mpic_percpu_base_vaddr = of_iomap(np2, 0);
|
|
if (!mpic_percpu_base_vaddr)
|
|
pr_err("ehv_pic_init: of_iomap failed\n");
|
|
|
|
of_node_put(np2);
|
|
}
|
|
|
|
ehv_pic->hc_irq = ehv_pic_irq_chip;
|
|
ehv_pic->hc_irq.irq_set_affinity = ehv_pic_set_affinity;
|
|
ehv_pic->coreint_flag = coreint_flag;
|
|
|
|
global_ehv_pic = ehv_pic;
|
|
irq_set_default_host(global_ehv_pic->irqhost);
|
|
}
|