Contributors: 12
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Michal Simek |
416 |
39.06% |
15 |
45.45% |
| Zubair Lutfullah Kakakhel |
312 |
29.30% |
5 |
15.15% |
| Mubin Sayyed |
158 |
14.84% |
1 |
3.03% |
| Grant C. Likely |
95 |
8.92% |
1 |
3.03% |
| Thomas Gleixner |
41 |
3.85% |
2 |
6.06% |
| Marc Zyngier |
23 |
2.16% |
2 |
6.06% |
| Steven J. Magnani |
11 |
1.03% |
1 |
3.03% |
| Joël Porquet |
3 |
0.28% |
1 |
3.03% |
| Sören Brinkmann |
2 |
0.19% |
2 |
6.06% |
| John A. Williams |
2 |
0.19% |
1 |
3.03% |
| Ingo Molnar |
1 |
0.09% |
1 |
3.03% |
| Rob Herring |
1 |
0.09% |
1 |
3.03% |
| Total |
1065 |
|
33 |
|
/*
* Copyright (C) 2007-2013 Michal Simek <monstr@monstr.eu>
* Copyright (C) 2012-2013 Xilinx, Inc.
* Copyright (C) 2007-2009 PetaLogix
* Copyright (C) 2006 Atmark Techno, Inc.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#include <linux/irqdomain.h>
#include <linux/irq.h>
#include <linux/irqchip.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/of_address.h>
#include <linux/io.h>
#include <linux/jump_label.h>
#include <linux/bug.h>
#include <linux/of_irq.h>
/* No one else should require these constants, so define them locally here. */
#define ISR 0x00 /* Interrupt Status Register */
#define IPR 0x04 /* Interrupt Pending Register */
#define IER 0x08 /* Interrupt Enable Register */
#define IAR 0x0c /* Interrupt Acknowledge Register */
#define SIE 0x10 /* Set Interrupt Enable bits */
#define CIE 0x14 /* Clear Interrupt Enable bits */
#define IVR 0x18 /* Interrupt Vector Register */
#define MER 0x1c /* Master Enable Register */
#define MER_ME (1<<0)
#define MER_HIE (1<<1)
#define SPURIOUS_IRQ (-1U)
static DEFINE_STATIC_KEY_FALSE(xintc_is_be);
struct xintc_irq_chip {
void __iomem *base;
struct irq_domain *root_domain;
u32 intr_mask;
u32 nr_irq;
};
static struct xintc_irq_chip *primary_intc;
static void xintc_write(struct xintc_irq_chip *irqc, int reg, u32 data)
{
if (static_branch_unlikely(&xintc_is_be))
iowrite32be(data, irqc->base + reg);
else
iowrite32(data, irqc->base + reg);
}
static u32 xintc_read(struct xintc_irq_chip *irqc, int reg)
{
if (static_branch_unlikely(&xintc_is_be))
return ioread32be(irqc->base + reg);
else
return ioread32(irqc->base + reg);
}
static void intc_enable_or_unmask(struct irq_data *d)
{
struct xintc_irq_chip *irqc = irq_data_get_irq_chip_data(d);
unsigned long mask = BIT(d->hwirq);
pr_debug("irq-xilinx: enable_or_unmask: %ld\n", d->hwirq);
/* ack level irqs because they can't be acked during
* ack function since the handle_level_irq function
* acks the irq before calling the interrupt handler
*/
if (irqd_is_level_type(d))
xintc_write(irqc, IAR, mask);
xintc_write(irqc, SIE, mask);
}
static void intc_disable_or_mask(struct irq_data *d)
{
struct xintc_irq_chip *irqc = irq_data_get_irq_chip_data(d);
pr_debug("irq-xilinx: disable: %ld\n", d->hwirq);
xintc_write(irqc, CIE, BIT(d->hwirq));
}
static void intc_ack(struct irq_data *d)
{
struct xintc_irq_chip *irqc = irq_data_get_irq_chip_data(d);
pr_debug("irq-xilinx: ack: %ld\n", d->hwirq);
xintc_write(irqc, IAR, BIT(d->hwirq));
}
static void intc_mask_ack(struct irq_data *d)
{
struct xintc_irq_chip *irqc = irq_data_get_irq_chip_data(d);
unsigned long mask = BIT(d->hwirq);
pr_debug("irq-xilinx: disable_and_ack: %ld\n", d->hwirq);
xintc_write(irqc, CIE, mask);
xintc_write(irqc, IAR, mask);
}
static struct irq_chip intc_dev = {
.name = "Xilinx INTC",
.irq_unmask = intc_enable_or_unmask,
.irq_mask = intc_disable_or_mask,
.irq_ack = intc_ack,
.irq_mask_ack = intc_mask_ack,
};
static int xintc_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
{
struct xintc_irq_chip *irqc = d->host_data;
if (irqc->intr_mask & BIT(hw)) {
irq_set_chip_and_handler_name(irq, &intc_dev,
handle_edge_irq, "edge");
irq_clear_status_flags(irq, IRQ_LEVEL);
} else {
irq_set_chip_and_handler_name(irq, &intc_dev,
handle_level_irq, "level");
irq_set_status_flags(irq, IRQ_LEVEL);
}
irq_set_chip_data(irq, irqc);
return 0;
}
static const struct irq_domain_ops xintc_irq_domain_ops = {
.xlate = irq_domain_xlate_onetwocell,
.map = xintc_map,
};
static void xil_intc_irq_handler(struct irq_desc *desc)
{
struct irq_chip *chip = irq_desc_get_chip(desc);
struct xintc_irq_chip *irqc;
irqc = irq_data_get_irq_handler_data(&desc->irq_data);
chained_irq_enter(chip, desc);
do {
u32 hwirq = xintc_read(irqc, IVR);
if (hwirq == -1U)
break;
generic_handle_domain_irq(irqc->root_domain, hwirq);
} while (true);
chained_irq_exit(chip, desc);
}
static void xil_intc_handle_irq(struct pt_regs *regs)
{
u32 hwirq;
do {
hwirq = xintc_read(primary_intc, IVR);
if (unlikely(hwirq == SPURIOUS_IRQ))
break;
generic_handle_domain_irq(primary_intc->root_domain, hwirq);
} while (true);
}
static int __init xilinx_intc_of_init(struct device_node *intc,
struct device_node *parent)
{
struct xintc_irq_chip *irqc;
int ret, irq;
irqc = kzalloc(sizeof(*irqc), GFP_KERNEL);
if (!irqc)
return -ENOMEM;
irqc->base = of_iomap(intc, 0);
BUG_ON(!irqc->base);
ret = of_property_read_u32(intc, "xlnx,num-intr-inputs", &irqc->nr_irq);
if (ret < 0) {
pr_err("irq-xilinx: unable to read xlnx,num-intr-inputs\n");
goto error;
}
ret = of_property_read_u32(intc, "xlnx,kind-of-intr", &irqc->intr_mask);
if (ret < 0) {
pr_warn("irq-xilinx: unable to read xlnx,kind-of-intr\n");
irqc->intr_mask = 0;
}
if (irqc->intr_mask >> irqc->nr_irq)
pr_warn("irq-xilinx: mismatch in kind-of-intr param\n");
pr_info("irq-xilinx: %pOF: num_irq=%d, edge=0x%x\n",
intc, irqc->nr_irq, irqc->intr_mask);
/*
* Disable all external interrupts until they are
* explicitly requested.
*/
xintc_write(irqc, IER, 0);
/* Acknowledge any pending interrupts just in case. */
xintc_write(irqc, IAR, 0xffffffff);
/* Turn on the Master Enable. */
xintc_write(irqc, MER, MER_HIE | MER_ME);
if (xintc_read(irqc, MER) != (MER_HIE | MER_ME)) {
static_branch_enable(&xintc_is_be);
xintc_write(irqc, MER, MER_HIE | MER_ME);
}
irqc->root_domain = irq_domain_add_linear(intc, irqc->nr_irq,
&xintc_irq_domain_ops, irqc);
if (!irqc->root_domain) {
pr_err("irq-xilinx: Unable to create IRQ domain\n");
ret = -EINVAL;
goto error;
}
if (parent) {
irq = irq_of_parse_and_map(intc, 0);
if (irq) {
irq_set_chained_handler_and_data(irq,
xil_intc_irq_handler,
irqc);
} else {
pr_err("irq-xilinx: interrupts property not in DT\n");
ret = -EINVAL;
goto error;
}
} else {
primary_intc = irqc;
irq_set_default_host(primary_intc->root_domain);
set_handle_irq(xil_intc_handle_irq);
}
return 0;
error:
iounmap(irqc->base);
kfree(irqc);
return ret;
}
IRQCHIP_DECLARE(xilinx_intc_xps, "xlnx,xps-intc-1.00.a", xilinx_intc_of_init);
IRQCHIP_DECLARE(xilinx_intc_opb, "xlnx,opb-intc-1.00.c", xilinx_intc_of_init);