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lib: utils/irqchip: Allow multiple FDT irqchip drivers

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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 certainly 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@wdc.com>
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
This commit is contained in:
Anup Patel
2021-04-20 11:52:47 +05:30
committed by Anup Patel
parent 222132f48c
commit 5f56314618
1 changed files with 30 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
lib/utils/irqchip/fdt_irqchip.c
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@@ -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;
}