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Subject[PATCH V8 02/10] irqchip/loongson-pch-pic: Add ACPI init support
Date
We are preparing to add new Loongson (based on LoongArch, not compatible
with old MIPS-based Loongson) support. LoongArch use ACPI other than DT
as its boot protocol, so add ACPI init support.

PCH-PIC/PCH-MSI stands for "Interrupt Controller" that described in
Section 5 of "Loongson 7A1000 Bridge User Manual". For more information
please refer Documentation/loongarch/irq-chip-model.rst.

Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
---
drivers/irqchip/irq-loongson-pch-pic.c | 108 ++++++++++++++++++-------
1 file changed, 81 insertions(+), 27 deletions(-)

diff --git a/drivers/irqchip/irq-loongson-pch-pic.c b/drivers/irqchip/irq-loongson-pch-pic.c
index a4eb8a2181c7..b0644d595789 100644
--- a/drivers/irqchip/irq-loongson-pch-pic.c
+++ b/drivers/irqchip/irq-loongson-pch-pic.c
@@ -33,13 +33,18 @@
#define PIC_REG_IDX(irq_id) ((irq_id) / PIC_COUNT_PER_REG)
#define PIC_REG_BIT(irq_id) ((irq_id) % PIC_COUNT_PER_REG)

+static int nr_pics;
+
struct pch_pic {
void __iomem *base;
struct irq_domain *pic_domain;
+ struct fwnode_handle *domain_handle;
u32 ht_vec_base;
raw_spinlock_t pic_lock;
};

+static struct pch_pic *pch_pic_priv[2];
+
static void pch_pic_bitset(struct pch_pic *priv, int offset, int bit)
{
u32 reg;
@@ -180,7 +185,7 @@ static void pch_pic_reset(struct pch_pic *priv)
int i;

for (i = 0; i < PIC_COUNT; i++) {
- /* Write vectored ID */
+ /* Write vector ID */
writeb(priv->ht_vec_base + i, priv->base + PCH_INT_HTVEC(i));
/* Hardcode route to HT0 Lo */
writeb(1, priv->base + PCH_INT_ROUTE(i));
@@ -198,50 +203,37 @@ static void pch_pic_reset(struct pch_pic *priv)
}
}

-static int pch_pic_of_init(struct device_node *node,
- struct device_node *parent)
+static int pch_pic_init(phys_addr_t addr, unsigned long size, int vec_base,
+ struct irq_domain *parent_domain, struct fwnode_handle *domain_handle)
{
+ int vec_count;
struct pch_pic *priv;
- struct irq_domain *parent_domain;
- int err;

priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;

raw_spin_lock_init(&priv->pic_lock);
- priv->base = of_iomap(node, 0);
- if (!priv->base) {
- err = -ENOMEM;
+ priv->base = ioremap(addr, size);
+ if (!priv->base)
goto free_priv;
- }

- parent_domain = irq_find_host(parent);
- if (!parent_domain) {
- pr_err("Failed to find the parent domain\n");
- err = -ENXIO;
- goto iounmap_base;
- }
+ priv->domain_handle = domain_handle;

- if (of_property_read_u32(node, "loongson,pic-base-vec",
- &priv->ht_vec_base)) {
- pr_err("Failed to determine pic-base-vec\n");
- err = -EINVAL;
- goto iounmap_base;
- }
+ priv->ht_vec_base = vec_base;
+ vec_count = ((readq(priv->base) >> 48) & 0xff) + 1;

priv->pic_domain = irq_domain_create_hierarchy(parent_domain, 0,
- PIC_COUNT,
- of_node_to_fwnode(node),
- &pch_pic_domain_ops,
- priv);
+ vec_count, priv->domain_handle,
+ &pch_pic_domain_ops, priv);
+
if (!priv->pic_domain) {
pr_err("Failed to create IRQ domain\n");
- err = -ENOMEM;
goto iounmap_base;
}

pch_pic_reset(priv);
+ pch_pic_priv[nr_pics++] = priv;

return 0;

@@ -250,7 +242,69 @@ static int pch_pic_of_init(struct device_node *node,
free_priv:
kfree(priv);

- return err;
+ return -EINVAL;
+}
+
+#ifdef CONFIG_OF
+
+static int pch_pic_of_init(struct device_node *node,
+ struct device_node *parent)
+{
+ int err, vec_base;
+ struct resource res;
+ struct irq_domain *parent_domain;
+
+ if (of_address_to_resource(node, 0, &res))
+ return -EINVAL;
+
+ parent_domain = irq_find_host(parent);
+ if (!parent_domain) {
+ pr_err("Failed to find the parent domain\n");
+ return -ENXIO;
+ }
+
+ if (of_property_read_u32(node, "loongson,pic-base-vec", &vec_base)) {
+ pr_err("Failed to determine pic-base-vec\n");
+ return -EINVAL;
+ }
+
+ err = pch_pic_init(res.start, resource_size(&res), vec_base,
+ parent_domain, of_node_to_fwnode(node));
+ if (err < 0)
+ return err;
+
+ return 0;
}

IRQCHIP_DECLARE(pch_pic, "loongson,pch-pic-1.0", pch_pic_of_init);
+
+#endif
+
+#ifdef CONFIG_ACPI
+
+struct irq_domain *pch_pic_acpi_init(struct irq_domain *parent,
+ struct acpi_madt_bio_pic *acpi_pchpic)
+{
+ int ret, vec_base;
+ struct fwnode_handle *domain_handle;
+
+ if (!acpi_pchpic)
+ return NULL;
+
+ vec_base = acpi_pchpic->gsi_base - GSI_MIN_PCH_IRQ;
+
+ domain_handle = irq_domain_alloc_fwnode((phys_addr_t *)acpi_pchpic);
+ if (!domain_handle) {
+ pr_err("Unable to allocate domain handle\n");
+ return NULL;
+ }
+
+ ret = pch_pic_init(acpi_pchpic->address, acpi_pchpic->size,
+ vec_base, parent, domain_handle);
+ if (ret < 0)
+ return NULL;
+
+ return irq_find_matching_fwnode(domain_handle, DOMAIN_BUS_ANY);
+}
+
+#endif
--
2.27.0
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