Messages in this thread Patch in this message | | | From | Jianmin Lv <> | Subject | [PATCH RFC 03/10] irqchip/loongson-pch-pic: Add ACPI init support | Date | Sun, 15 May 2022 11:37:06 +0800 |
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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> Signed-off-by: Jianmin Lv <lvjianmin@loongson.cn> --- drivers/irqchip/irq-loongson-pch-pic.c | 167 +++++++++++++++++++++++++++------ 1 file changed, 140 insertions(+), 27 deletions(-)
diff --git a/drivers/irqchip/irq-loongson-pch-pic.c b/drivers/irqchip/irq-loongson-pch-pic.c index a4eb8a2..e374939 100644 --- a/drivers/irqchip/irq-loongson-pch-pic.c +++ b/drivers/irqchip/irq-loongson-pch-pic.c @@ -15,6 +15,7 @@ #include <linux/of_address.h> #include <linux/of_irq.h> #include <linux/of_platform.h> +#include "irq-loongarch-pic-common.h" /* Registers */ #define PCH_PIC_MASK 0x20 @@ -33,13 +34,20 @@ #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; + u32 gsi_end; + u32 gsi_base; }; +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 +188,7 @@ 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 +206,61 @@ static void pch_pic_reset(struct pch_pic *priv) } } -static int pch_pic_of_init(struct device_node *node, - struct device_node *parent) +int find_pch_pic(u32 gsi) { + int i; + + if (nr_pics == 0) + return -1; + + /* Find the PCH_PIC that manages this GSI. */ + for (i = 0; i < nr_pics; i++) { + if (gsi >= pch_pic_priv[i]->gsi_base && gsi <= pch_pic_priv[i]->gsi_end) + return i; + } + + printk(KERN_ERR "ERROR: Unable to locate PCH_PIC for GSI %d\n", gsi); + return -1; +} + +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, + u32 gsi_base) +{ + 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->gsi_base = gsi_base; + priv->gsi_end = gsi_base + vec_count - 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_domain[nr_pics] = priv->pic_domain; + pch_pic_priv[nr_pics++] = priv; + register_syscore_ops(&pch_pic_syscore_ops); + + register_syscore_ops(&pch_pic_syscore_ops); return 0; @@ -250,7 +269,101 @@ 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), 0); + if (err < 0) + return err; + + return 0; } IRQCHIP_DECLARE(pch_pic, "loongson,pch-pic-1.0", pch_pic_of_init); + +#endif + +#ifdef CONFIG_ACPI +static int __init +lpcintc_parse_madt(union acpi_subtable_headers *header, + const unsigned long end) +{ + struct acpi_madt_lpc_pic *lpcintc_entry = (struct acpi_madt_lpc_pic *)header; + + return pch_lpc_acpi_init(pch_pic_priv[0]->pic_domain, lpcintc_entry); +} + +static int __init acpi_cascade_irqdomain_init(void) +{ + acpi_table_parse_madt(ACPI_MADT_TYPE_LPC_PIC, + lpcintc_parse_madt, 0); + return 0; +} +int __init pch_pic_init_irqdomain(struct irq_domain *parent, + struct acpi_madt_bio_pic *acpi_pchpic) +{ + int ret, vec_base; + struct fwnode_handle *domain_handle; + + if (!acpi_pchpic) + return -EINVAL; + + 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 -ENOMEM; + } + + ret = pch_pic_init(acpi_pchpic->address, acpi_pchpic->size, + vec_base, parent, domain_handle, acpi_pchpic->gsi_base); + if (ret == 0 && acpi_pchpic->id == 0) + acpi_cascade_irqdomain_init(); + + return ret; +} + +static int __init pchintc_parse_madt(union acpi_subtable_headers *header, + const unsigned long end) +{ + struct acpi_madt_bio_pic *pch_pic_entry = (struct acpi_madt_bio_pic *)header; + + acpi_pchpic[nr_pics] = pch_pic_entry; + return pch_pic_init_irqdomain(acpi_get_pch_parent((pch_pic_entry->address >> 44) & 0xf), + pch_pic_entry); +} + +static int __init pch_pic_acpi_init(void) +{ + acpi_table_parse_madt(ACPI_MADT_TYPE_BIO_PIC, + pchintc_parse_madt, 0); + + return 0; +} +early_initcall(pch_pic_acpi_init); +#endif -- 1.8.3.1
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