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irqchip/loongson-liointc: irqchip add 2.0 version 

Add IO interrupt controller support for Loongson-2K1000, different
from the Loongson-3A series is that Loongson-2K1000 has 64 interrupt
sources, 0-31 correspond to the device tree liointc0 device node, and
the other correspond to liointc1 node.

Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Signed-off-by: Qing Zhang <zhangqing@loongson.cn>
Tested-by: Ming Wang <wangming01@loongson.cn>
Acked-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
This commit is contained in:
Qing Zhang 2021-03-15 15:50:02 +08:00 committed by Thomas Bogendoerfer
parent 44151ea089
commit b2c4c3969f
1 changed files with 49 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

58
drivers/irqchip/irq-loongson-liointc.c
View File

@ -20,6 +20,7 @@
#define LIOINTC_CHIP_IRQ 32
#define LIOINTC_NUM_PARENT 4
#define LIOINTC_NUM_CORES 4
#define LIOINTC_INTC_CHIP_START 0x20
@ -42,6 +43,7 @@ struct liointc_handler_data {
struct liointc_priv {
struct irq_chip_generic *gc;
struct liointc_handler_data handler[LIOINTC_NUM_PARENT];
void __iomem *core_isr[LIOINTC_NUM_CORES];
u8 map_cache[LIOINTC_CHIP_IRQ];
bool has_lpc_irq_errata;
};
@ -51,11 +53,12 @@ static void liointc_chained_handle_irq(struct irq_desc *desc)
struct liointc_handler_data *handler = irq_desc_get_handler_data(desc);
struct irq_chip *chip = irq_desc_get_chip(desc);
struct irq_chip_generic *gc = handler->priv->gc;
int core = get_ebase_cpunum() % LIOINTC_NUM_CORES;
u32 pending;
chained_irq_enter(chip, desc);
pending = readl(gc->reg_base + LIOINTC_REG_INTC_STATUS);
pending = readl(handler->priv->core_isr[core]);
if (!pending) {
/* Always blame LPC IRQ if we have that bug */
@ -141,6 +144,18 @@ static void liointc_resume(struct irq_chip_generic *gc)
}
static const char * const parent_names[] = {"int0", "int1", "int2", "int3"};
static const char * const core_reg_names[] = {"isr0", "isr1", "isr2", "isr3"};
static void __iomem *liointc_get_reg_byname(struct device_node *node,
const char *name)
{
int index = of_property_match_string(node, "reg-names", name);
if (index < 0)
return NULL;
return of_iomap(node, index);
}
static int __init liointc_of_init(struct device_node *node,
struct device_node *parent)
@ -159,10 +174,28 @@ static int __init liointc_of_init(struct device_node *node,
if (!priv)
return -ENOMEM;
base = of_iomap(node, 0);
if (!base) {
err = -ENODEV;
goto out_free_priv;
if (of_device_is_compatible(node, "loongson,liointc-2.0")) {
base = liointc_get_reg_byname(node, "main");
if (!base) {
err = -ENODEV;
goto out_free_priv;
}
for (i = 0; i < LIOINTC_NUM_CORES; i++)
priv->core_isr[i] = liointc_get_reg_byname(node, core_reg_names[i]);
if (!priv->core_isr[0]) {
err = -ENODEV;
goto out_iounmap_base;
}
} else {
base = of_iomap(node, 0);
if (!base) {
err = -ENODEV;
goto out_free_priv;
}
for (i = 0; i < LIOINTC_NUM_CORES; i++)
priv->core_isr[i] = base + LIOINTC_REG_INTC_STATUS;
}
for (i = 0; i < LIOINTC_NUM_PARENT; i++) {
@ -172,7 +205,7 @@ static int __init liointc_of_init(struct device_node *node,
}
if (!have_parent) {
err = -ENODEV;
goto out_iounmap;
goto out_iounmap_isr;
}
sz = of_property_read_variable_u32_array(node,
@ -183,7 +216,7 @@ static int __init liointc_of_init(struct device_node *node,
if (sz < 4) {
pr_err("loongson-liointc: No parent_int_map\n");
err = -ENODEV;
goto out_iounmap;
goto out_iounmap_isr;
}
for (i = 0; i < LIOINTC_NUM_PARENT; i++)
@ -195,7 +228,7 @@ static int __init liointc_of_init(struct device_node *node,
if (!domain) {
pr_err("loongson-liointc: cannot add IRQ domain\n");
err = -EINVAL;
goto out_iounmap;
goto out_iounmap_isr;
}
err = irq_alloc_domain_generic_chips(domain, 32, 1,
@ -260,7 +293,13 @@ static int __init liointc_of_init(struct device_node *node,
out_free_domain:
irq_domain_remove(domain);
out_iounmap:
out_iounmap_isr:
for (i = 0; i < LIOINTC_NUM_CORES; i++) {
if (!priv->core_isr[i])
continue;
iounmap(priv->core_isr[i]);
}
out_iounmap_base:
iounmap(base);
out_free_priv:
kfree(priv);
@ -270,3 +309,4 @@ out_free_priv:
IRQCHIP_DECLARE(loongson_liointc_1_0, "loongson,liointc-1.0", liointc_of_init);
IRQCHIP_DECLARE(loongson_liointc_1_0a, "loongson,liointc-1.0a", liointc_of_init);
IRQCHIP_DECLARE(loongson_liointc_2_0, "loongson,liointc-2.0", liointc_of_init);