[PATCH v5 5/7] irqchip/loongson-liointc: irqchip add 2.0 version

Qing Zhang
2021-03-15T07:51:12Z

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>
---

v4-v5:
- No change

drivers/irqchip/irq-loongson-liointc.c | 58 ++++++++++++++++++++++----
1 file changed, 49 insertions(+), 9 deletions(-)

diff --git a/drivers/irqchip/irq-loongson-liointc.c b/drivers/irqchip/irq-loongson-liointc.c
index 249566a23cc4..8ccb30421806 100644
--- a/drivers/irqchip/irq-loongson-liointc.c
+++ b/drivers/irqchip/irq-loongson-liointc.c
@@ -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 @@ static int __init liointc_of_init(struct device_node *node,

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);
--
2.20.1