[PATCH 05/13] lib: utils/irqchip: Allow multiple FDT irqchip drivers
Anup Patel
apatel at ventanamicro.com
Tue Jan 4 02:13:15 PST 2022
We can have multiple FDT irqchip drivers to be probed when a RISC-V
system has different types of interrupt controller in a hierarchy.
This will be certainely the case when a RISC-V system has both
RISC-V AIA IMSIC and RISC-V AIA APLIC implemented.
We extend simple FDT irqchip framework to allow multiple FDT
irqchip drivers to be used for same RISC-V platform.
Signed-off-by: Anup Patel <anup.patel at wdc.com>
Signed-off-by: Anup Patel <apatel at ventanamicro.com>
---
lib/utils/irqchip/fdt_irqchip.c | 37 ++++++++++++++++++++++++++-------
1 file changed, 30 insertions(+), 7 deletions(-)
diff --git a/lib/utils/irqchip/fdt_irqchip.c b/lib/utils/irqchip/fdt_irqchip.c
index 8dda661..bf6969a 100644
--- a/lib/utils/irqchip/fdt_irqchip.c
+++ b/lib/utils/irqchip/fdt_irqchip.c
@@ -18,23 +18,40 @@ static struct fdt_irqchip *irqchip_drivers[] = {
&fdt_irqchip_plic
};
-static struct fdt_irqchip *current_driver = NULL;
+#define FDT_IRQCHIP_MAX_DRIVERS 8
+
+static struct fdt_irqchip *current_drivers[FDT_IRQCHIP_MAX_DRIVERS] = {0};
+static int current_drivers_count;
void fdt_irqchip_exit(void)
{
- if (current_driver && current_driver->exit)
- current_driver->exit();
+ int i;
+
+ for (i = 0; i < current_drivers_count; i++) {
+ if (!current_drivers[i] || !current_drivers[i]->exit)
+ continue;
+ current_drivers[i]->exit();
+ }
}
static int fdt_irqchip_warm_init(void)
{
- if (current_driver && current_driver->warm_init)
- return current_driver->warm_init();
+ int i, rc;
+
+ for (i = 0; i < current_drivers_count; i++) {
+ if (!current_drivers[i] || !current_drivers[i]->warm_init)
+ continue;
+ rc = current_drivers[i]->warm_init();
+ if (rc)
+ return rc;
+ }
+
return 0;
}
static int fdt_irqchip_cold_init(void)
{
+ bool drv_added;
int pos, noff, rc;
struct fdt_irqchip *drv;
const struct fdt_match *match;
@@ -44,6 +61,7 @@ static int fdt_irqchip_cold_init(void)
drv = irqchip_drivers[pos];
noff = -1;
+ drv_added = false;
while ((noff = fdt_find_match(fdt, noff,
drv->match_table, &match)) >= 0) {
if (drv->cold_init) {
@@ -53,10 +71,15 @@ static int fdt_irqchip_cold_init(void)
if (rc)
return rc;
}
- current_driver = drv;
+
+ if (drv_added)
+ continue;
+
+ current_drivers[current_drivers_count++] = drv;
+ drv_added = true;
}
- if (current_driver)
+ if (FDT_IRQCHIP_MAX_DRIVERS <= current_drivers_count)
break;
}
--
2.25.1
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