| Message ID | 20221111044207.1478350-8-apatel@ventanamicro.com (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Palmer Dabbelt |
| Headers | show |
| Series | Linux RISC-V AIA Support | expand |
| Context | Check | Description |
|---|---|---|
| conchuod/tree_selection | fail | Guessing tree name failed |
On Thu, Nov 10, 2022 at 11:45 PM Anup Patel <apatel@ventanamicro.com> wrote: > > The RISC-V advanced interrupt architecture (AIA) specification defines > a new interrupt controller for managing wired interrupts on a RISC-V > platform. This new interrupt controller is referred to as advanced > platform-level interrupt controller (APLIC) which can forward wired > interrupts to CPUs (or HARTs) as local interrupts OR as message > signaled interrupts. > (For more details refer https://github.com/riscv/riscv-aia) > > This patch adds an irqchip driver for RISC-V APLIC found on RISC-V > platforms. > > Signed-off-by: Anup Patel <apatel@ventanamicro.com> > --- > drivers/irqchip/Kconfig | 12 + > drivers/irqchip/Makefile | 1 + > drivers/irqchip/irq-riscv-aplic.c | 656 ++++++++++++++++++++++++++++ > include/linux/irqchip/riscv-aplic.h | 117 +++++ > 4 files changed, 786 insertions(+) > create mode 100644 drivers/irqchip/irq-riscv-aplic.c > create mode 100644 include/linux/irqchip/riscv-aplic.h > > diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig > index 8246c08f0fd3..9f022e71d937 100644 > --- a/drivers/irqchip/Kconfig > +++ b/drivers/irqchip/Kconfig > @@ -563,6 +563,18 @@ config SIFIVE_PLIC > > If you don't know what to do here, say Y. > > +config RISCV_APLIC > + bool "RISC-V Advanced Platform-Level Interrupt Controller" > + depends on RISCV > + select IRQ_DOMAIN_HIERARCHY > + select GENERIC_MSI_IRQ_DOMAIN > + help > + This enables support for the APLIC chip found in RISC-V systems. > + The APLIC controls device wired interrupts and forwards them to > + each core as wired local interrupt or per-core MSIs. > + > + If you don't know what to do here, say Y. > + > config RISCV_IMSIC > bool "RISC-V Incoming MSI Controller" > depends on RISCV > diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile > index 22c723cc6ec8..6154e5bc4228 100644 > --- a/drivers/irqchip/Makefile > +++ b/drivers/irqchip/Makefile > @@ -96,6 +96,7 @@ obj-$(CONFIG_QCOM_MPM) += irq-qcom-mpm.o > obj-$(CONFIG_CSKY_MPINTC) += irq-csky-mpintc.o > obj-$(CONFIG_CSKY_APB_INTC) += irq-csky-apb-intc.o > obj-$(CONFIG_RISCV_INTC) += irq-riscv-intc.o > +obj-$(CONFIG_RISCV_APLIC) += irq-riscv-aplic.o > obj-$(CONFIG_RISCV_IMSIC) += irq-riscv-imsic.o > obj-$(CONFIG_SIFIVE_PLIC) += irq-sifive-plic.o > obj-$(CONFIG_IMX_IRQSTEER) += irq-imx-irqsteer.o > diff --git a/drivers/irqchip/irq-riscv-aplic.c b/drivers/irqchip/irq-riscv-aplic.c > new file mode 100644 > index 000000000000..e6d0e1bb15a8 > --- /dev/null > +++ b/drivers/irqchip/irq-riscv-aplic.c > @@ -0,0 +1,656 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Copyright (C) 2021 Western Digital Corporation or its affiliates. > + * Copyright (C) 2022 Ventana Micro Systems Inc. > + */ > + > +#include <linux/bitops.h> > +#include <linux/cpu.h> > +#include <linux/interrupt.h> > +#include <linux/io.h> > +#include <linux/irq.h> > +#include <linux/irqchip.h> > +#include <linux/irqchip/chained_irq.h> > +#include <linux/irqchip/riscv-aplic.h> > +#include <linux/irqchip/riscv-imsic.h> > +#include <linux/irqdomain.h> > +#include <linux/module.h> > +#include <linux/msi.h> > +#include <linux/of.h> > +#include <linux/of_address.h> > +#include <linux/of_irq.h> > +#include <linux/platform_device.h> > +#include <linux/smp.h> > + > +#define APLIC_DEFAULT_PRIORITY 1 > +#define APLIC_DISABLE_IDELIVERY 0 > +#define APLIC_ENABLE_IDELIVERY 1 > +#define APLIC_DISABLE_ITHRESHOLD 1 > +#define APLIC_ENABLE_ITHRESHOLD 0 > + > +struct aplic_msicfg { > + phys_addr_t base_ppn; > + u32 hhxs; > + u32 hhxw; > + u32 lhxs; > + u32 lhxw; > +}; > + > +struct aplic_idc { > + unsigned int hart_index; > + void __iomem *regs; > + struct aplic_priv *priv; > +}; > + > +struct aplic_priv { > + struct device *dev; > + u32 nr_irqs; > + u32 nr_idcs; > + void __iomem *regs; > + struct irq_domain *irqdomain; > + struct aplic_msicfg msicfg; > + struct cpumask lmask; > +}; > + > +static unsigned int aplic_idc_parent_irq; > +static DEFINE_PER_CPU(struct aplic_idc, aplic_idcs); > + > +static void aplic_irq_unmask(struct irq_data *d) > +{ > + struct aplic_priv *priv = irq_data_get_irq_chip_data(d); > + > + writel(d->hwirq, priv->regs + APLIC_SETIENUM); > + > + if (!priv->nr_idcs) > + irq_chip_unmask_parent(d); > +} > + > +static void aplic_irq_mask(struct irq_data *d) > +{ > + struct aplic_priv *priv = irq_data_get_irq_chip_data(d); > + > + writel(d->hwirq, priv->regs + APLIC_CLRIENUM); > + > + if (!priv->nr_idcs) > + irq_chip_mask_parent(d); > +} > + > +static int aplic_set_type(struct irq_data *d, unsigned int type) > +{ > + u32 val = 0; > + void __iomem *sourcecfg; > + struct aplic_priv *priv = irq_data_get_irq_chip_data(d); > + > + switch (type) { > + case IRQ_TYPE_NONE: > + val = APLIC_SOURCECFG_SM_INACTIVE; > + break; > + case IRQ_TYPE_LEVEL_LOW: > + val = APLIC_SOURCECFG_SM_LEVEL_LOW; > + break; > + case IRQ_TYPE_LEVEL_HIGH: > + val = APLIC_SOURCECFG_SM_LEVEL_HIGH; > + break; > + case IRQ_TYPE_EDGE_FALLING: > + val = APLIC_SOURCECFG_SM_EDGE_FALL; > + break; > + case IRQ_TYPE_EDGE_RISING: > + val = APLIC_SOURCECFG_SM_EDGE_RISE; > + break; > + default: > + return -EINVAL; > + } > + > + sourcecfg = priv->regs + APLIC_SOURCECFG_BASE; > + sourcecfg += (d->hwirq - 1) * sizeof(u32); > + writel(val, sourcecfg); > + > + return 0; > +} > + > +#ifdef CONFIG_SMP > +static int aplic_set_affinity(struct irq_data *d, > + const struct cpumask *mask_val, bool force) > +{ > + struct aplic_priv *priv = irq_data_get_irq_chip_data(d); > + struct aplic_idc *idc; > + unsigned int cpu, val; > + struct cpumask amask; > + void __iomem *target; > + > + if (!priv->nr_idcs) > + return irq_chip_set_affinity_parent(d, mask_val, force); > + > + cpumask_and(&amask, &priv->lmask, mask_val); > + > + if (force) > + cpu = cpumask_first(&amask); > + else > + cpu = cpumask_any_and(&amask, cpu_online_mask); > + > + if (cpu >= nr_cpu_ids) > + return -EINVAL; > + > + idc = per_cpu_ptr(&aplic_idcs, cpu); > + target = priv->regs + APLIC_TARGET_BASE; > + target += (d->hwirq - 1) * sizeof(u32); > + val = idc->hart_index & APLIC_TARGET_HART_IDX_MASK; > + val <<= APLIC_TARGET_HART_IDX_SHIFT; > + val |= APLIC_DEFAULT_PRIORITY; > + writel(val, target); > + > + irq_data_update_effective_affinity(d, cpumask_of(cpu)); > + > + return IRQ_SET_MASK_OK_DONE; > +} > +#endif > + > +static struct irq_chip aplic_chip = { > + .name = "RISC-V APLIC", > + .irq_mask = aplic_irq_mask, > + .irq_unmask = aplic_irq_unmask, > + .irq_set_type = aplic_set_type, > +#ifdef CONFIG_SMP > + .irq_set_affinity = aplic_set_affinity, > +#endif > + .flags = IRQCHIP_SET_TYPE_MASKED | > + IRQCHIP_SKIP_SET_WAKE | > + IRQCHIP_MASK_ON_SUSPEND, > +}; > + > +static int aplic_irqdomain_translate(struct irq_domain *d, > + struct irq_fwspec *fwspec, > + unsigned long *hwirq, > + unsigned int *type) > +{ > + if (WARN_ON(fwspec->param_count < 2)) > + return -EINVAL; > + if (WARN_ON(!fwspec->param[0])) > + return -EINVAL; > + > + *hwirq = fwspec->param[0]; > + *type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK; > + > + WARN_ON(*type == IRQ_TYPE_NONE); > + > + return 0; > +} > + > +static int aplic_irqdomain_msi_alloc(struct irq_domain *domain, > + unsigned int virq, unsigned int nr_irqs, > + void *arg) > +{ > + int i, ret; > + unsigned int type; > + irq_hw_number_t hwirq; > + struct irq_fwspec *fwspec = arg; > + struct aplic_priv *priv = platform_msi_get_host_data(domain); > + > + ret = aplic_irqdomain_translate(domain, fwspec, &hwirq, &type); > + if (ret) > + return ret; > + > + ret = platform_msi_device_domain_alloc(domain, virq, nr_irqs); > + if (ret) > + return ret; > + > + for (i = 0; i < nr_irqs; i++) > + irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i, > + &aplic_chip, priv); > + > + return 0; > +} > + > +static const struct irq_domain_ops aplic_irqdomain_msi_ops = { > + .translate = aplic_irqdomain_translate, > + .alloc = aplic_irqdomain_msi_alloc, > + .free = platform_msi_device_domain_free, > +}; > + > +static int aplic_irqdomain_idc_alloc(struct irq_domain *domain, > + unsigned int virq, unsigned int nr_irqs, > + void *arg) > +{ > + int i, ret; > + unsigned int type; > + irq_hw_number_t hwirq; > + struct irq_fwspec *fwspec = arg; > + struct aplic_priv *priv = domain->host_data; > + > + ret = aplic_irqdomain_translate(domain, fwspec, &hwirq, &type); > + if (ret) > + return ret; > + > + for (i = 0; i < nr_irqs; i++) { > + irq_domain_set_info(domain, virq + i, hwirq + i, > + &aplic_chip, priv, handle_simple_irq, > + NULL, NULL); > + irq_set_affinity(virq + i, &priv->lmask); > + } > + > + return 0; > +} > + > +static const struct irq_domain_ops aplic_irqdomain_idc_ops = { > + .translate = aplic_irqdomain_translate, > + .alloc = aplic_irqdomain_idc_alloc, > + .free = irq_domain_free_irqs_top, > +}; > + > +static void aplic_init_hw_irqs(struct aplic_priv *priv) > +{ > + int i; > + > + /* Disable all interrupts */ > + for (i = 0; i <= priv->nr_irqs; i += 32) > + writel(-1U, priv->regs + APLIC_CLRIE_BASE + > + (i / 32) * sizeof(u32)); > + > + /* Set interrupt type and default priority for all interrupts */ > + for (i = 1; i <= priv->nr_irqs; i++) { > + writel(0, priv->regs + APLIC_SOURCECFG_BASE + > + (i - 1) * sizeof(u32)); > + writel(APLIC_DEFAULT_PRIORITY, > + priv->regs + APLIC_TARGET_BASE + > + (i - 1) * sizeof(u32)); > + } > + > + /* Clear APLIC domaincfg */ > + writel(0, priv->regs + APLIC_DOMAINCFG); > +} > + > +static void aplic_init_hw_global(struct aplic_priv *priv) > +{ > + u32 val; > +#ifdef CONFIG_RISCV_M_MODE > + u32 valH; > + > + if (!priv->nr_idcs) { > + val = priv->msicfg.base_ppn; > + valH = (priv->msicfg.base_ppn >> 32) & > + APLIC_xMSICFGADDRH_BAPPN_MASK; > + valH |= (priv->msicfg.lhxw & APLIC_xMSICFGADDRH_LHXW_MASK) > + << APLIC_xMSICFGADDRH_LHXW_SHIFT; > + valH |= (priv->msicfg.hhxw & APLIC_xMSICFGADDRH_HHXW_MASK) > + << APLIC_xMSICFGADDRH_HHXW_SHIFT; > + valH |= (priv->msicfg.lhxs & APLIC_xMSICFGADDRH_LHXS_MASK) > + << APLIC_xMSICFGADDRH_LHXS_SHIFT; > + valH |= (priv->msicfg.hhxs & APLIC_xMSICFGADDRH_HHXS_MASK) > + << APLIC_xMSICFGADDRH_HHXS_SHIFT; > + writel(val, priv->regs + APLIC_xMSICFGADDR); > + writel(valH, priv->regs + APLIC_xMSICFGADDRH); > + } > +#endif > + > + /* Setup APLIC domaincfg register */ > + val = readl(priv->regs + APLIC_DOMAINCFG); > + val |= APLIC_DOMAINCFG_IE; > + if (!priv->nr_idcs) > + val |= APLIC_DOMAINCFG_DM; > + writel(val, priv->regs + APLIC_DOMAINCFG); > + if (readl(priv->regs + APLIC_DOMAINCFG) != val) > + dev_warn(priv->dev, > + "unable to write 0x%x in domaincfg\n", val); > +} > + > +static void aplic_msi_write_msg(struct msi_desc *desc, struct msi_msg *msg) > +{ > + unsigned int group_index, hart_index, guest_index, val; > + struct device *dev = msi_desc_to_dev(desc); > + struct aplic_priv *priv = dev_get_drvdata(dev); > + struct irq_data *d = irq_get_irq_data(desc->irq); > + struct aplic_msicfg *mc = &priv->msicfg; > + phys_addr_t tppn, tbppn, msg_addr; > + void __iomem *target; > + > + /* Save the MSI address and data */ > + msg_addr = (((u64)msg->address_hi) << 32) | msg->address_lo; > + WARN_ON(msg->data > APLIC_TARGET_EIID_MASK); > + > + /* Compute target HART PPN */ > + tppn = msg_addr >> APLIC_xMSICFGADDR_PPN_SHIFT; > + > + /* Compute target HART Base PPN */ > + tbppn = tppn; > + tbppn &= ~APLIC_xMSICFGADDR_PPN_HART(mc->lhxs); > + tbppn &= ~APLIC_xMSICFGADDR_PPN_LHX(mc->lhxw, mc->lhxs); > + tbppn &= ~APLIC_xMSICFGADDR_PPN_HHX(mc->hhxw, mc->hhxs); > + WARN_ON(tbppn != mc->base_ppn); platform_msi_write_msg() will get called with a zeroed-out msg_msg in the free_irq() path, triggering this warning. Should detect that case and (I assume) just write 0 to the APLIC target register. -Andrew > + > + /* Compute target group and hart indexes */ > + group_index = (tppn >> APLIC_xMSICFGADDR_PPN_HHX_SHIFT(mc->hhxs)) & > + APLIC_xMSICFGADDR_PPN_HHX_MASK(mc->hhxw); > + hart_index = (tppn >> APLIC_xMSICFGADDR_PPN_LHX_SHIFT(mc->lhxs)) & > + APLIC_xMSICFGADDR_PPN_LHX_MASK(mc->lhxw); > + hart_index |= (group_index << mc->lhxw); > + WARN_ON(hart_index > APLIC_TARGET_HART_IDX_MASK); > + > + /* Compute target guest index */ > + guest_index = tppn & APLIC_xMSICFGADDR_PPN_HART(mc->lhxs); > + WARN_ON(guest_index > APLIC_TARGET_GUEST_IDX_MASK); > + > + /* Update IRQ TARGET register */ > + target = priv->regs + APLIC_TARGET_BASE; > + target += (d->hwirq - 1) * sizeof(u32); > + val = (hart_index & APLIC_TARGET_HART_IDX_MASK) > + << APLIC_TARGET_HART_IDX_SHIFT; > + val |= (guest_index & APLIC_TARGET_GUEST_IDX_MASK) > + << APLIC_TARGET_GUEST_IDX_SHIFT; > + val |= (msg->data & APLIC_TARGET_EIID_MASK); > + writel(val, target); > +} > + > +static int aplic_setup_msi(struct aplic_priv *priv) > +{ > + struct device *dev = priv->dev; > + struct aplic_msicfg *mc = &priv->msicfg; > + const struct imsic_global_config *imsic_global; > + > + /* > + * The APLIC outgoing MSI config registers assume target MSI > + * controller to be RISC-V AIA IMSIC controller. > + */ > + imsic_global = imsic_get_global_config(); > + if (!imsic_global) { > + dev_err(dev, "IMSIC global config not found\n"); > + return -ENODEV; > + } > + > + /* Find number of guest index bits (LHXS) */ > + mc->lhxs = imsic_global->guest_index_bits; > + if (APLIC_xMSICFGADDRH_LHXS_MASK < mc->lhxs) { > + dev_err(dev, "IMSIC guest index bits big for APLIC LHXS\n"); > + return -EINVAL; > + } > + > + /* Find number of HART index bits (LHXW) */ > + mc->lhxw = imsic_global->hart_index_bits; > + if (APLIC_xMSICFGADDRH_LHXW_MASK < mc->lhxw) { > + dev_err(dev, "IMSIC hart index bits big for APLIC LHXW\n"); > + return -EINVAL; > + } > + > + /* Find number of group index bits (HHXW) */ > + mc->hhxw = imsic_global->group_index_bits; > + if (APLIC_xMSICFGADDRH_HHXW_MASK < mc->hhxw) { > + dev_err(dev, "IMSIC group index bits big for APLIC HHXW\n"); > + return -EINVAL; > + } > + > + /* Find first bit position of group index (HHXS) */ > + mc->hhxs = imsic_global->group_index_shift; > + if (mc->hhxs < (2 * APLIC_xMSICFGADDR_PPN_SHIFT)) { > + dev_err(dev, "IMSIC group index shift should be >= %d\n", > + (2 * APLIC_xMSICFGADDR_PPN_SHIFT)); > + return -EINVAL; > + } > + mc->hhxs -= (2 * APLIC_xMSICFGADDR_PPN_SHIFT); > + if (APLIC_xMSICFGADDRH_HHXS_MASK < mc->hhxs) { > + dev_err(dev, "IMSIC group index shift big for APLIC HHXS\n"); > + return -EINVAL; > + } > + > + /* Compute PPN base */ > + mc->base_ppn = imsic_global->base_addr >> APLIC_xMSICFGADDR_PPN_SHIFT; > + mc->base_ppn &= ~APLIC_xMSICFGADDR_PPN_HART(mc->lhxs); > + mc->base_ppn &= ~APLIC_xMSICFGADDR_PPN_LHX(mc->lhxw, mc->lhxs); > + mc->base_ppn &= ~APLIC_xMSICFGADDR_PPN_HHX(mc->hhxw, mc->hhxs); > + > + /* Use all possible CPUs as lmask */ > + cpumask_copy(&priv->lmask, cpu_possible_mask); > + > + return 0; > +} > + > +/* > + * To handle an APLIC IDC interrupts, we just read the CLAIMI register > + * which will return highest priority pending interrupt and clear the > + * pending bit of the interrupt. This process is repeated until CLAIMI > + * register return zero value. > + */ > +static void aplic_idc_handle_irq(struct irq_desc *desc) > +{ > + struct aplic_idc *idc = this_cpu_ptr(&aplic_idcs); > + struct irq_chip *chip = irq_desc_get_chip(desc); > + irq_hw_number_t hw_irq; > + int irq; > + > + chained_irq_enter(chip, desc); > + > + while ((hw_irq = readl(idc->regs + APLIC_IDC_CLAIMI))) { > + hw_irq = hw_irq >> APLIC_IDC_TOPI_ID_SHIFT; > + irq = irq_find_mapping(idc->priv->irqdomain, hw_irq); > + > + if (unlikely(irq <= 0)) > + pr_warn_ratelimited("hw_irq %lu mapping not found\n", > + hw_irq); > + else > + generic_handle_irq(irq); > + } > + > + chained_irq_exit(chip, desc); > +} > + > +static void aplic_idc_set_delivery(struct aplic_idc *idc, bool en) > +{ > + u32 de = (en) ? APLIC_ENABLE_IDELIVERY : APLIC_DISABLE_IDELIVERY; > + u32 th = (en) ? APLIC_ENABLE_ITHRESHOLD : APLIC_DISABLE_ITHRESHOLD; > + > + /* Priority must be less than threshold for interrupt triggering */ > + writel(th, idc->regs + APLIC_IDC_ITHRESHOLD); > + > + /* Delivery must be set to 1 for interrupt triggering */ > + writel(de, idc->regs + APLIC_IDC_IDELIVERY); > +} > + > +static int aplic_idc_dying_cpu(unsigned int cpu) > +{ > + if (aplic_idc_parent_irq) > + disable_percpu_irq(aplic_idc_parent_irq); > + > + return 0; > +} > + > +static int aplic_idc_starting_cpu(unsigned int cpu) > +{ > + if (aplic_idc_parent_irq) > + enable_percpu_irq(aplic_idc_parent_irq, > + irq_get_trigger_type(aplic_idc_parent_irq)); > + > + return 0; > +} > + > +static int aplic_setup_idc(struct aplic_priv *priv) > +{ > + int i, j, rc, cpu, setup_count = 0; > + struct device_node *node = priv->dev->of_node; > + struct device *dev = priv->dev; > + struct of_phandle_args parent; > + struct irq_domain *domain; > + unsigned long hartid; > + struct aplic_idc *idc; > + u32 val; > + > + /* Setup per-CPU IDC and target CPU mask */ > + for (i = 0; i < priv->nr_idcs; i++) { > + if (of_irq_parse_one(node, i, &parent)) { > + dev_err(dev, "failed to parse parent for IDC%d.\n", > + i); > + return -EIO; > + } > + > + /* Skip IDCs which do not connect to external interrupts */ > + if (parent.args[0] != RV_IRQ_EXT) > + continue; > + > + rc = riscv_of_parent_hartid(parent.np, &hartid); > + if (rc) { > + dev_err(dev, "failed to parse hart ID for IDC%d.\n", > + i); > + return rc; > + } > + > + cpu = riscv_hartid_to_cpuid(hartid); > + if (cpu < 0) { > + dev_warn(dev, "invalid cpuid for IDC%d\n", i); > + continue; > + } > + > + cpumask_set_cpu(cpu, &priv->lmask); > + > + idc = per_cpu_ptr(&aplic_idcs, cpu); > + WARN_ON(idc->priv); > + > + idc->hart_index = i; > + idc->regs = priv->regs + APLIC_IDC_BASE + i * APLIC_IDC_SIZE; > + idc->priv = priv; > + > + aplic_idc_set_delivery(idc, true); > + > + /* > + * Boot cpu might not have APLIC hart_index = 0 so check > + * and update target registers of all interrupts. > + */ > + if (cpu == smp_processor_id() && idc->hart_index) { > + val = idc->hart_index & APLIC_TARGET_HART_IDX_MASK; > + val <<= APLIC_TARGET_HART_IDX_SHIFT; > + val |= APLIC_DEFAULT_PRIORITY; > + for (j = 1; j <= priv->nr_irqs; j++) > + writel(val, priv->regs + APLIC_TARGET_BASE + > + (j - 1) * sizeof(u32)); > + } > + > + setup_count++; > + } > + > + /* Find parent domain and register chained handler */ > + domain = irq_find_matching_fwnode(riscv_get_intc_hwnode(), > + DOMAIN_BUS_ANY); > + if (!aplic_idc_parent_irq && domain) { > + aplic_idc_parent_irq = irq_create_mapping(domain, RV_IRQ_EXT); > + if (aplic_idc_parent_irq) { > + irq_set_chained_handler(aplic_idc_parent_irq, > + aplic_idc_handle_irq); > + > + /* > + * Setup CPUHP notifier to enable IDC parent > + * interrupt on all CPUs > + */ > + cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, > + "irqchip/riscv/aplic:starting", > + aplic_idc_starting_cpu, > + aplic_idc_dying_cpu); > + } > + } > + > + /* Fail if we were not able to setup IDC for any CPU */ > + return (setup_count) ? 0 : -ENODEV; > +} > + > +static int aplic_probe(struct platform_device *pdev) > +{ > + struct device_node *node = pdev->dev.of_node; > + struct device *dev = &pdev->dev; > + struct aplic_priv *priv; > + struct resource *regs; > + phys_addr_t pa; > + int rc; > + > + regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + if (!regs) { > + dev_err(dev, "cannot find registers resource\n"); > + return -ENOENT; > + } > + > + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); > + if (!priv) > + return -ENOMEM; > + platform_set_drvdata(pdev, priv); > + priv->dev = dev; > + > + priv->regs = devm_ioremap(dev, regs->start, resource_size(regs)); > + if (WARN_ON(!priv->regs)) { > + dev_err(dev, "failed ioremap registers\n"); > + return -EIO; > + } > + > + of_property_read_u32(node, "riscv,num-sources", &priv->nr_irqs); > + if (!priv->nr_irqs) { > + dev_err(dev, "failed to get number of interrupt sources\n"); > + return -EINVAL; > + } > + > + /* Setup initial state APLIC interrupts */ > + aplic_init_hw_irqs(priv); > + > + /* Setup IDCs or MSIs based on parent interrupts in DT node */ > + priv->nr_idcs = of_irq_count(node); > + if (priv->nr_idcs) > + rc = aplic_setup_idc(priv); > + else > + rc = aplic_setup_msi(priv); > + if (rc) > + return rc; > + > + /* Setup global config and interrupt delivery */ > + aplic_init_hw_global(priv); > + > + /* Create irq domain instance for the APLIC */ > + if (priv->nr_idcs) > + priv->irqdomain = irq_domain_create_linear( > + of_node_to_fwnode(node), > + priv->nr_irqs + 1, > + &aplic_irqdomain_idc_ops, > + priv); > + else > + priv->irqdomain = platform_msi_create_device_domain(dev, > + priv->nr_irqs + 1, > + aplic_msi_write_msg, > + &aplic_irqdomain_msi_ops, > + priv); > + if (!priv->irqdomain) { > + dev_err(dev, "failed to add irq domain\n"); > + return -ENOMEM; > + } > + > + /* Advertise the interrupt controller */ > + if (priv->nr_idcs) { > + dev_info(dev, "%d interrupts directly connected to %d CPUs\n", > + priv->nr_irqs, priv->nr_idcs); > + } else { > + pa = priv->msicfg.base_ppn << APLIC_xMSICFGADDR_PPN_SHIFT; > + dev_info(dev, "%d interrupts forwared to MSI base %pa\n", > + priv->nr_irqs, &pa); > + } > + > + return 0; > +} > + > +static int aplic_remove(struct platform_device *pdev) > +{ > + struct aplic_priv *priv = platform_get_drvdata(pdev); > + > + irq_domain_remove(priv->irqdomain); > + > + return 0; > +} > + > +static const struct of_device_id aplic_match[] = { > + { .compatible = "riscv,aplic" }, > + {} > +}; > + > +static struct platform_driver aplic_driver = { > + .driver = { > + .name = "riscv-aplic", > + .of_match_table = aplic_match, > + }, > + .probe = aplic_probe, > + .remove = aplic_remove, > +}; > + > +static int __init aplic_init(void) > +{ > + return platform_driver_register(&aplic_driver); > +} > +core_initcall(aplic_init); > diff --git a/include/linux/irqchip/riscv-aplic.h b/include/linux/irqchip/riscv-aplic.h > new file mode 100644 > index 000000000000..88177eefd411 > --- /dev/null > +++ b/include/linux/irqchip/riscv-aplic.h > @@ -0,0 +1,117 @@ > +/* SPDX-License-Identifier: GPL-2.0-only */ > +/* > + * Copyright (C) 2021 Western Digital Corporation or its affiliates. > + * Copyright (C) 2022 Ventana Micro Systems Inc. > + */ > +#ifndef __LINUX_IRQCHIP_RISCV_APLIC_H > +#define __LINUX_IRQCHIP_RISCV_APLIC_H > + > +#include <linux/bitops.h> > + > +#define APLIC_MAX_IDC BIT(14) > +#define APLIC_MAX_SOURCE 1024 > + > +#define APLIC_DOMAINCFG 0x0000 > +#define APLIC_DOMAINCFG_RDONLY 0x80000000 > +#define APLIC_DOMAINCFG_IE BIT(8) > +#define APLIC_DOMAINCFG_DM BIT(2) > +#define APLIC_DOMAINCFG_BE BIT(0) > + > +#define APLIC_SOURCECFG_BASE 0x0004 > +#define APLIC_SOURCECFG_D BIT(10) > +#define APLIC_SOURCECFG_CHILDIDX_MASK 0x000003ff > +#define APLIC_SOURCECFG_SM_MASK 0x00000007 > +#define APLIC_SOURCECFG_SM_INACTIVE 0x0 > +#define APLIC_SOURCECFG_SM_DETACH 0x1 > +#define APLIC_SOURCECFG_SM_EDGE_RISE 0x4 > +#define APLIC_SOURCECFG_SM_EDGE_FALL 0x5 > +#define APLIC_SOURCECFG_SM_LEVEL_HIGH 0x6 > +#define APLIC_SOURCECFG_SM_LEVEL_LOW 0x7 > + > +#define APLIC_MMSICFGADDR 0x1bc0 > +#define APLIC_MMSICFGADDRH 0x1bc4 > +#define APLIC_SMSICFGADDR 0x1bc8 > +#define APLIC_SMSICFGADDRH 0x1bcc > + > +#ifdef CONFIG_RISCV_M_MODE > +#define APLIC_xMSICFGADDR APLIC_MMSICFGADDR > +#define APLIC_xMSICFGADDRH APLIC_MMSICFGADDRH > +#else > +#define APLIC_xMSICFGADDR APLIC_SMSICFGADDR > +#define APLIC_xMSICFGADDRH APLIC_SMSICFGADDRH > +#endif > + > +#define APLIC_xMSICFGADDRH_L BIT(31) > +#define APLIC_xMSICFGADDRH_HHXS_MASK 0x1f > +#define APLIC_xMSICFGADDRH_HHXS_SHIFT 24 > +#define APLIC_xMSICFGADDRH_LHXS_MASK 0x7 > +#define APLIC_xMSICFGADDRH_LHXS_SHIFT 20 > +#define APLIC_xMSICFGADDRH_HHXW_MASK 0x7 > +#define APLIC_xMSICFGADDRH_HHXW_SHIFT 16 > +#define APLIC_xMSICFGADDRH_LHXW_MASK 0xf > +#define APLIC_xMSICFGADDRH_LHXW_SHIFT 12 > +#define APLIC_xMSICFGADDRH_BAPPN_MASK 0xfff > + > +#define APLIC_xMSICFGADDR_PPN_SHIFT 12 > + > +#define APLIC_xMSICFGADDR_PPN_HART(__lhxs) \ > + (BIT(__lhxs) - 1) > + > +#define APLIC_xMSICFGADDR_PPN_LHX_MASK(__lhxw) \ > + (BIT(__lhxw) - 1) > +#define APLIC_xMSICFGADDR_PPN_LHX_SHIFT(__lhxs) \ > + ((__lhxs)) > +#define APLIC_xMSICFGADDR_PPN_LHX(__lhxw, __lhxs) \ > + (APLIC_xMSICFGADDR_PPN_LHX_MASK(__lhxw) << \ > + APLIC_xMSICFGADDR_PPN_LHX_SHIFT(__lhxs)) > + > +#define APLIC_xMSICFGADDR_PPN_HHX_MASK(__hhxw) \ > + (BIT(__hhxw) - 1) > +#define APLIC_xMSICFGADDR_PPN_HHX_SHIFT(__hhxs) \ > + ((__hhxs) + APLIC_xMSICFGADDR_PPN_SHIFT) > +#define APLIC_xMSICFGADDR_PPN_HHX(__hhxw, __hhxs) \ > + (APLIC_xMSICFGADDR_PPN_HHX_MASK(__hhxw) << \ > + APLIC_xMSICFGADDR_PPN_HHX_SHIFT(__hhxs)) > + > +#define APLIC_SETIP_BASE 0x1c00 > +#define APLIC_SETIPNUM 0x1cdc > + > +#define APLIC_CLRIP_BASE 0x1d00 > +#define APLIC_CLRIPNUM 0x1ddc > + > +#define APLIC_SETIE_BASE 0x1e00 > +#define APLIC_SETIENUM 0x1edc > + > +#define APLIC_CLRIE_BASE 0x1f00 > +#define APLIC_CLRIENUM 0x1fdc > + > +#define APLIC_SETIPNUM_LE 0x2000 > +#define APLIC_SETIPNUM_BE 0x2004 > + > +#define APLIC_GENMSI 0x3000 > + > +#define APLIC_TARGET_BASE 0x3004 > +#define APLIC_TARGET_HART_IDX_SHIFT 18 > +#define APLIC_TARGET_HART_IDX_MASK 0x3fff > +#define APLIC_TARGET_GUEST_IDX_SHIFT 12 > +#define APLIC_TARGET_GUEST_IDX_MASK 0x3f > +#define APLIC_TARGET_IPRIO_MASK 0xff > +#define APLIC_TARGET_EIID_MASK 0x7ff > + > +#define APLIC_IDC_BASE 0x4000 > +#define APLIC_IDC_SIZE 32 > + > +#define APLIC_IDC_IDELIVERY 0x00 > + > +#define APLIC_IDC_IFORCE 0x04 > + > +#define APLIC_IDC_ITHRESHOLD 0x08 > + > +#define APLIC_IDC_TOPI 0x18 > +#define APLIC_IDC_TOPI_ID_SHIFT 16 > +#define APLIC_IDC_TOPI_ID_MASK 0x3ff > +#define APLIC_IDC_TOPI_PRIO_MASK 0xff > + > +#define APLIC_IDC_CLAIMI 0x1c > + > +#endif > -- > 2.34.1 >
diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig index 8246c08f0fd3..9f022e71d937 100644 --- a/drivers/irqchip/Kconfig +++ b/drivers/irqchip/Kconfig @@ -563,6 +563,18 @@ config SIFIVE_PLIC If you don't know what to do here, say Y. +config RISCV_APLIC + bool "RISC-V Advanced Platform-Level Interrupt Controller" + depends on RISCV + select IRQ_DOMAIN_HIERARCHY + select GENERIC_MSI_IRQ_DOMAIN + help + This enables support for the APLIC chip found in RISC-V systems. + The APLIC controls device wired interrupts and forwards them to + each core as wired local interrupt or per-core MSIs. + + If you don't know what to do here, say Y. + config RISCV_IMSIC bool "RISC-V Incoming MSI Controller" depends on RISCV diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile index 22c723cc6ec8..6154e5bc4228 100644 --- a/drivers/irqchip/Makefile +++ b/drivers/irqchip/Makefile @@ -96,6 +96,7 @@ obj-$(CONFIG_QCOM_MPM) += irq-qcom-mpm.o obj-$(CONFIG_CSKY_MPINTC) += irq-csky-mpintc.o obj-$(CONFIG_CSKY_APB_INTC) += irq-csky-apb-intc.o obj-$(CONFIG_RISCV_INTC) += irq-riscv-intc.o +obj-$(CONFIG_RISCV_APLIC) += irq-riscv-aplic.o obj-$(CONFIG_RISCV_IMSIC) += irq-riscv-imsic.o obj-$(CONFIG_SIFIVE_PLIC) += irq-sifive-plic.o obj-$(CONFIG_IMX_IRQSTEER) += irq-imx-irqsteer.o diff --git a/drivers/irqchip/irq-riscv-aplic.c b/drivers/irqchip/irq-riscv-aplic.c new file mode 100644 index 000000000000..e6d0e1bb15a8 --- /dev/null +++ b/drivers/irqchip/irq-riscv-aplic.c @@ -0,0 +1,656 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2021 Western Digital Corporation or its affiliates. + * Copyright (C) 2022 Ventana Micro Systems Inc. + */ + +#include <linux/bitops.h> +#include <linux/cpu.h> +#include <linux/interrupt.h> +#include <linux/io.h> +#include <linux/irq.h> +#include <linux/irqchip.h> +#include <linux/irqchip/chained_irq.h> +#include <linux/irqchip/riscv-aplic.h> +#include <linux/irqchip/riscv-imsic.h> +#include <linux/irqdomain.h> +#include <linux/module.h> +#include <linux/msi.h> +#include <linux/of.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/platform_device.h> +#include <linux/smp.h> + +#define APLIC_DEFAULT_PRIORITY 1 +#define APLIC_DISABLE_IDELIVERY 0 +#define APLIC_ENABLE_IDELIVERY 1 +#define APLIC_DISABLE_ITHRESHOLD 1 +#define APLIC_ENABLE_ITHRESHOLD 0 + +struct aplic_msicfg { + phys_addr_t base_ppn; + u32 hhxs; + u32 hhxw; + u32 lhxs; + u32 lhxw; +}; + +struct aplic_idc { + unsigned int hart_index; + void __iomem *regs; + struct aplic_priv *priv; +}; + +struct aplic_priv { + struct device *dev; + u32 nr_irqs; + u32 nr_idcs; + void __iomem *regs; + struct irq_domain *irqdomain; + struct aplic_msicfg msicfg; + struct cpumask lmask; +}; + +static unsigned int aplic_idc_parent_irq; +static DEFINE_PER_CPU(struct aplic_idc, aplic_idcs); + +static void aplic_irq_unmask(struct irq_data *d) +{ + struct aplic_priv *priv = irq_data_get_irq_chip_data(d); + + writel(d->hwirq, priv->regs + APLIC_SETIENUM); + + if (!priv->nr_idcs) + irq_chip_unmask_parent(d); +} + +static void aplic_irq_mask(struct irq_data *d) +{ + struct aplic_priv *priv = irq_data_get_irq_chip_data(d); + + writel(d->hwirq, priv->regs + APLIC_CLRIENUM); + + if (!priv->nr_idcs) + irq_chip_mask_parent(d); +} + +static int aplic_set_type(struct irq_data *d, unsigned int type) +{ + u32 val = 0; + void __iomem *sourcecfg; + struct aplic_priv *priv = irq_data_get_irq_chip_data(d); + + switch (type) { + case IRQ_TYPE_NONE: + val = APLIC_SOURCECFG_SM_INACTIVE; + break; + case IRQ_TYPE_LEVEL_LOW: + val = APLIC_SOURCECFG_SM_LEVEL_LOW; + break; + case IRQ_TYPE_LEVEL_HIGH: + val = APLIC_SOURCECFG_SM_LEVEL_HIGH; + break; + case IRQ_TYPE_EDGE_FALLING: + val = APLIC_SOURCECFG_SM_EDGE_FALL; + break; + case IRQ_TYPE_EDGE_RISING: + val = APLIC_SOURCECFG_SM_EDGE_RISE; + break; + default: + return -EINVAL; + } + + sourcecfg = priv->regs + APLIC_SOURCECFG_BASE; + sourcecfg += (d->hwirq - 1) * sizeof(u32); + writel(val, sourcecfg); + + return 0; +} + +#ifdef CONFIG_SMP +static int aplic_set_affinity(struct irq_data *d, + const struct cpumask *mask_val, bool force) +{ + struct aplic_priv *priv = irq_data_get_irq_chip_data(d); + struct aplic_idc *idc; + unsigned int cpu, val; + struct cpumask amask; + void __iomem *target; + + if (!priv->nr_idcs) + return irq_chip_set_affinity_parent(d, mask_val, force); + + cpumask_and(&amask, &priv->lmask, mask_val); + + if (force) + cpu = cpumask_first(&amask); + else + cpu = cpumask_any_and(&amask, cpu_online_mask); + + if (cpu >= nr_cpu_ids) + return -EINVAL; + + idc = per_cpu_ptr(&aplic_idcs, cpu); + target = priv->regs + APLIC_TARGET_BASE; + target += (d->hwirq - 1) * sizeof(u32); + val = idc->hart_index & APLIC_TARGET_HART_IDX_MASK; + val <<= APLIC_TARGET_HART_IDX_SHIFT; + val |= APLIC_DEFAULT_PRIORITY; + writel(val, target); + + irq_data_update_effective_affinity(d, cpumask_of(cpu)); + + return IRQ_SET_MASK_OK_DONE; +} +#endif + +static struct irq_chip aplic_chip = { + .name = "RISC-V APLIC", + .irq_mask = aplic_irq_mask, + .irq_unmask = aplic_irq_unmask, + .irq_set_type = aplic_set_type, +#ifdef CONFIG_SMP + .irq_set_affinity = aplic_set_affinity, +#endif + .flags = IRQCHIP_SET_TYPE_MASKED | + IRQCHIP_SKIP_SET_WAKE | + IRQCHIP_MASK_ON_SUSPEND, +}; + +static int aplic_irqdomain_translate(struct irq_domain *d, + struct irq_fwspec *fwspec, + unsigned long *hwirq, + unsigned int *type) +{ + if (WARN_ON(fwspec->param_count < 2)) + return -EINVAL; + if (WARN_ON(!fwspec->param[0])) + return -EINVAL; + + *hwirq = fwspec->param[0]; + *type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK; + + WARN_ON(*type == IRQ_TYPE_NONE); + + return 0; +} + +static int aplic_irqdomain_msi_alloc(struct irq_domain *domain, + unsigned int virq, unsigned int nr_irqs, + void *arg) +{ + int i, ret; + unsigned int type; + irq_hw_number_t hwirq; + struct irq_fwspec *fwspec = arg; + struct aplic_priv *priv = platform_msi_get_host_data(domain); + + ret = aplic_irqdomain_translate(domain, fwspec, &hwirq, &type); + if (ret) + return ret; + + ret = platform_msi_device_domain_alloc(domain, virq, nr_irqs); + if (ret) + return ret; + + for (i = 0; i < nr_irqs; i++) + irq_domain_set_hwirq_and_chip(domain, virq + i, hwirq + i, + &aplic_chip, priv); + + return 0; +} + +static const struct irq_domain_ops aplic_irqdomain_msi_ops = { + .translate = aplic_irqdomain_translate, + .alloc = aplic_irqdomain_msi_alloc, + .free = platform_msi_device_domain_free, +}; + +static int aplic_irqdomain_idc_alloc(struct irq_domain *domain, + unsigned int virq, unsigned int nr_irqs, + void *arg) +{ + int i, ret; + unsigned int type; + irq_hw_number_t hwirq; + struct irq_fwspec *fwspec = arg; + struct aplic_priv *priv = domain->host_data; + + ret = aplic_irqdomain_translate(domain, fwspec, &hwirq, &type); + if (ret) + return ret; + + for (i = 0; i < nr_irqs; i++) { + irq_domain_set_info(domain, virq + i, hwirq + i, + &aplic_chip, priv, handle_simple_irq, + NULL, NULL); + irq_set_affinity(virq + i, &priv->lmask); + } + + return 0; +} + +static const struct irq_domain_ops aplic_irqdomain_idc_ops = { + .translate = aplic_irqdomain_translate, + .alloc = aplic_irqdomain_idc_alloc, + .free = irq_domain_free_irqs_top, +}; + +static void aplic_init_hw_irqs(struct aplic_priv *priv) +{ + int i; + + /* Disable all interrupts */ + for (i = 0; i <= priv->nr_irqs; i += 32) + writel(-1U, priv->regs + APLIC_CLRIE_BASE + + (i / 32) * sizeof(u32)); + + /* Set interrupt type and default priority for all interrupts */ + for (i = 1; i <= priv->nr_irqs; i++) { + writel(0, priv->regs + APLIC_SOURCECFG_BASE + + (i - 1) * sizeof(u32)); + writel(APLIC_DEFAULT_PRIORITY, + priv->regs + APLIC_TARGET_BASE + + (i - 1) * sizeof(u32)); + } + + /* Clear APLIC domaincfg */ + writel(0, priv->regs + APLIC_DOMAINCFG); +} + +static void aplic_init_hw_global(struct aplic_priv *priv) +{ + u32 val; +#ifdef CONFIG_RISCV_M_MODE + u32 valH; + + if (!priv->nr_idcs) { + val = priv->msicfg.base_ppn; + valH = (priv->msicfg.base_ppn >> 32) & + APLIC_xMSICFGADDRH_BAPPN_MASK; + valH |= (priv->msicfg.lhxw & APLIC_xMSICFGADDRH_LHXW_MASK) + << APLIC_xMSICFGADDRH_LHXW_SHIFT; + valH |= (priv->msicfg.hhxw & APLIC_xMSICFGADDRH_HHXW_MASK) + << APLIC_xMSICFGADDRH_HHXW_SHIFT; + valH |= (priv->msicfg.lhxs & APLIC_xMSICFGADDRH_LHXS_MASK) + << APLIC_xMSICFGADDRH_LHXS_SHIFT; + valH |= (priv->msicfg.hhxs & APLIC_xMSICFGADDRH_HHXS_MASK) + << APLIC_xMSICFGADDRH_HHXS_SHIFT; + writel(val, priv->regs + APLIC_xMSICFGADDR); + writel(valH, priv->regs + APLIC_xMSICFGADDRH); + } +#endif + + /* Setup APLIC domaincfg register */ + val = readl(priv->regs + APLIC_DOMAINCFG); + val |= APLIC_DOMAINCFG_IE; + if (!priv->nr_idcs) + val |= APLIC_DOMAINCFG_DM; + writel(val, priv->regs + APLIC_DOMAINCFG); + if (readl(priv->regs + APLIC_DOMAINCFG) != val) + dev_warn(priv->dev, + "unable to write 0x%x in domaincfg\n", val); +} + +static void aplic_msi_write_msg(struct msi_desc *desc, struct msi_msg *msg) +{ + unsigned int group_index, hart_index, guest_index, val; + struct device *dev = msi_desc_to_dev(desc); + struct aplic_priv *priv = dev_get_drvdata(dev); + struct irq_data *d = irq_get_irq_data(desc->irq); + struct aplic_msicfg *mc = &priv->msicfg; + phys_addr_t tppn, tbppn, msg_addr; + void __iomem *target; + + /* Save the MSI address and data */ + msg_addr = (((u64)msg->address_hi) << 32) | msg->address_lo; + WARN_ON(msg->data > APLIC_TARGET_EIID_MASK); + + /* Compute target HART PPN */ + tppn = msg_addr >> APLIC_xMSICFGADDR_PPN_SHIFT; + + /* Compute target HART Base PPN */ + tbppn = tppn; + tbppn &= ~APLIC_xMSICFGADDR_PPN_HART(mc->lhxs); + tbppn &= ~APLIC_xMSICFGADDR_PPN_LHX(mc->lhxw, mc->lhxs); + tbppn &= ~APLIC_xMSICFGADDR_PPN_HHX(mc->hhxw, mc->hhxs); + WARN_ON(tbppn != mc->base_ppn); + + /* Compute target group and hart indexes */ + group_index = (tppn >> APLIC_xMSICFGADDR_PPN_HHX_SHIFT(mc->hhxs)) & + APLIC_xMSICFGADDR_PPN_HHX_MASK(mc->hhxw); + hart_index = (tppn >> APLIC_xMSICFGADDR_PPN_LHX_SHIFT(mc->lhxs)) & + APLIC_xMSICFGADDR_PPN_LHX_MASK(mc->lhxw); + hart_index |= (group_index << mc->lhxw); + WARN_ON(hart_index > APLIC_TARGET_HART_IDX_MASK); + + /* Compute target guest index */ + guest_index = tppn & APLIC_xMSICFGADDR_PPN_HART(mc->lhxs); + WARN_ON(guest_index > APLIC_TARGET_GUEST_IDX_MASK); + + /* Update IRQ TARGET register */ + target = priv->regs + APLIC_TARGET_BASE; + target += (d->hwirq - 1) * sizeof(u32); + val = (hart_index & APLIC_TARGET_HART_IDX_MASK) + << APLIC_TARGET_HART_IDX_SHIFT; + val |= (guest_index & APLIC_TARGET_GUEST_IDX_MASK) + << APLIC_TARGET_GUEST_IDX_SHIFT; + val |= (msg->data & APLIC_TARGET_EIID_MASK); + writel(val, target); +} + +static int aplic_setup_msi(struct aplic_priv *priv) +{ + struct device *dev = priv->dev; + struct aplic_msicfg *mc = &priv->msicfg; + const struct imsic_global_config *imsic_global; + + /* + * The APLIC outgoing MSI config registers assume target MSI + * controller to be RISC-V AIA IMSIC controller. + */ + imsic_global = imsic_get_global_config(); + if (!imsic_global) { + dev_err(dev, "IMSIC global config not found\n"); + return -ENODEV; + } + + /* Find number of guest index bits (LHXS) */ + mc->lhxs = imsic_global->guest_index_bits; + if (APLIC_xMSICFGADDRH_LHXS_MASK < mc->lhxs) { + dev_err(dev, "IMSIC guest index bits big for APLIC LHXS\n"); + return -EINVAL; + } + + /* Find number of HART index bits (LHXW) */ + mc->lhxw = imsic_global->hart_index_bits; + if (APLIC_xMSICFGADDRH_LHXW_MASK < mc->lhxw) { + dev_err(dev, "IMSIC hart index bits big for APLIC LHXW\n"); + return -EINVAL; + } + + /* Find number of group index bits (HHXW) */ + mc->hhxw = imsic_global->group_index_bits; + if (APLIC_xMSICFGADDRH_HHXW_MASK < mc->hhxw) { + dev_err(dev, "IMSIC group index bits big for APLIC HHXW\n"); + return -EINVAL; + } + + /* Find first bit position of group index (HHXS) */ + mc->hhxs = imsic_global->group_index_shift; + if (mc->hhxs < (2 * APLIC_xMSICFGADDR_PPN_SHIFT)) { + dev_err(dev, "IMSIC group index shift should be >= %d\n", + (2 * APLIC_xMSICFGADDR_PPN_SHIFT)); + return -EINVAL; + } + mc->hhxs -= (2 * APLIC_xMSICFGADDR_PPN_SHIFT); + if (APLIC_xMSICFGADDRH_HHXS_MASK < mc->hhxs) { + dev_err(dev, "IMSIC group index shift big for APLIC HHXS\n"); + return -EINVAL; + } + + /* Compute PPN base */ + mc->base_ppn = imsic_global->base_addr >> APLIC_xMSICFGADDR_PPN_SHIFT; + mc->base_ppn &= ~APLIC_xMSICFGADDR_PPN_HART(mc->lhxs); + mc->base_ppn &= ~APLIC_xMSICFGADDR_PPN_LHX(mc->lhxw, mc->lhxs); + mc->base_ppn &= ~APLIC_xMSICFGADDR_PPN_HHX(mc->hhxw, mc->hhxs); + + /* Use all possible CPUs as lmask */ + cpumask_copy(&priv->lmask, cpu_possible_mask); + + return 0; +} + +/* + * To handle an APLIC IDC interrupts, we just read the CLAIMI register + * which will return highest priority pending interrupt and clear the + * pending bit of the interrupt. This process is repeated until CLAIMI + * register return zero value. + */ +static void aplic_idc_handle_irq(struct irq_desc *desc) +{ + struct aplic_idc *idc = this_cpu_ptr(&aplic_idcs); + struct irq_chip *chip = irq_desc_get_chip(desc); + irq_hw_number_t hw_irq; + int irq; + + chained_irq_enter(chip, desc); + + while ((hw_irq = readl(idc->regs + APLIC_IDC_CLAIMI))) { + hw_irq = hw_irq >> APLIC_IDC_TOPI_ID_SHIFT; + irq = irq_find_mapping(idc->priv->irqdomain, hw_irq); + + if (unlikely(irq <= 0)) + pr_warn_ratelimited("hw_irq %lu mapping not found\n", + hw_irq); + else + generic_handle_irq(irq); + } + + chained_irq_exit(chip, desc); +} + +static void aplic_idc_set_delivery(struct aplic_idc *idc, bool en) +{ + u32 de = (en) ? APLIC_ENABLE_IDELIVERY : APLIC_DISABLE_IDELIVERY; + u32 th = (en) ? APLIC_ENABLE_ITHRESHOLD : APLIC_DISABLE_ITHRESHOLD; + + /* Priority must be less than threshold for interrupt triggering */ + writel(th, idc->regs + APLIC_IDC_ITHRESHOLD); + + /* Delivery must be set to 1 for interrupt triggering */ + writel(de, idc->regs + APLIC_IDC_IDELIVERY); +} + +static int aplic_idc_dying_cpu(unsigned int cpu) +{ + if (aplic_idc_parent_irq) + disable_percpu_irq(aplic_idc_parent_irq); + + return 0; +} + +static int aplic_idc_starting_cpu(unsigned int cpu) +{ + if (aplic_idc_parent_irq) + enable_percpu_irq(aplic_idc_parent_irq, + irq_get_trigger_type(aplic_idc_parent_irq)); + + return 0; +} + +static int aplic_setup_idc(struct aplic_priv *priv) +{ + int i, j, rc, cpu, setup_count = 0; + struct device_node *node = priv->dev->of_node; + struct device *dev = priv->dev; + struct of_phandle_args parent; + struct irq_domain *domain; + unsigned long hartid; + struct aplic_idc *idc; + u32 val; + + /* Setup per-CPU IDC and target CPU mask */ + for (i = 0; i < priv->nr_idcs; i++) { + if (of_irq_parse_one(node, i, &parent)) { + dev_err(dev, "failed to parse parent for IDC%d.\n", + i); + return -EIO; + } + + /* Skip IDCs which do not connect to external interrupts */ + if (parent.args[0] != RV_IRQ_EXT) + continue; + + rc = riscv_of_parent_hartid(parent.np, &hartid); + if (rc) { + dev_err(dev, "failed to parse hart ID for IDC%d.\n", + i); + return rc; + } + + cpu = riscv_hartid_to_cpuid(hartid); + if (cpu < 0) { + dev_warn(dev, "invalid cpuid for IDC%d\n", i); + continue; + } + + cpumask_set_cpu(cpu, &priv->lmask); + + idc = per_cpu_ptr(&aplic_idcs, cpu); + WARN_ON(idc->priv); + + idc->hart_index = i; + idc->regs = priv->regs + APLIC_IDC_BASE + i * APLIC_IDC_SIZE; + idc->priv = priv; + + aplic_idc_set_delivery(idc, true); + + /* + * Boot cpu might not have APLIC hart_index = 0 so check + * and update target registers of all interrupts. + */ + if (cpu == smp_processor_id() && idc->hart_index) { + val = idc->hart_index & APLIC_TARGET_HART_IDX_MASK; + val <<= APLIC_TARGET_HART_IDX_SHIFT; + val |= APLIC_DEFAULT_PRIORITY; + for (j = 1; j <= priv->nr_irqs; j++) + writel(val, priv->regs + APLIC_TARGET_BASE + + (j - 1) * sizeof(u32)); + } + + setup_count++; + } + + /* Find parent domain and register chained handler */ + domain = irq_find_matching_fwnode(riscv_get_intc_hwnode(), + DOMAIN_BUS_ANY); + if (!aplic_idc_parent_irq && domain) { + aplic_idc_parent_irq = irq_create_mapping(domain, RV_IRQ_EXT); + if (aplic_idc_parent_irq) { + irq_set_chained_handler(aplic_idc_parent_irq, + aplic_idc_handle_irq); + + /* + * Setup CPUHP notifier to enable IDC parent + * interrupt on all CPUs + */ + cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, + "irqchip/riscv/aplic:starting", + aplic_idc_starting_cpu, + aplic_idc_dying_cpu); + } + } + + /* Fail if we were not able to setup IDC for any CPU */ + return (setup_count) ? 0 : -ENODEV; +} + +static int aplic_probe(struct platform_device *pdev) +{ + struct device_node *node = pdev->dev.of_node; + struct device *dev = &pdev->dev; + struct aplic_priv *priv; + struct resource *regs; + phys_addr_t pa; + int rc; + + regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!regs) { + dev_err(dev, "cannot find registers resource\n"); + return -ENOENT; + } + + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + platform_set_drvdata(pdev, priv); + priv->dev = dev; + + priv->regs = devm_ioremap(dev, regs->start, resource_size(regs)); + if (WARN_ON(!priv->regs)) { + dev_err(dev, "failed ioremap registers\n"); + return -EIO; + } + + of_property_read_u32(node, "riscv,num-sources", &priv->nr_irqs); + if (!priv->nr_irqs) { + dev_err(dev, "failed to get number of interrupt sources\n"); + return -EINVAL; + } + + /* Setup initial state APLIC interrupts */ + aplic_init_hw_irqs(priv); + + /* Setup IDCs or MSIs based on parent interrupts in DT node */ + priv->nr_idcs = of_irq_count(node); + if (priv->nr_idcs) + rc = aplic_setup_idc(priv); + else + rc = aplic_setup_msi(priv); + if (rc) + return rc; + + /* Setup global config and interrupt delivery */ + aplic_init_hw_global(priv); + + /* Create irq domain instance for the APLIC */ + if (priv->nr_idcs) + priv->irqdomain = irq_domain_create_linear( + of_node_to_fwnode(node), + priv->nr_irqs + 1, + &aplic_irqdomain_idc_ops, + priv); + else + priv->irqdomain = platform_msi_create_device_domain(dev, + priv->nr_irqs + 1, + aplic_msi_write_msg, + &aplic_irqdomain_msi_ops, + priv); + if (!priv->irqdomain) { + dev_err(dev, "failed to add irq domain\n"); + return -ENOMEM; + } + + /* Advertise the interrupt controller */ + if (priv->nr_idcs) { + dev_info(dev, "%d interrupts directly connected to %d CPUs\n", + priv->nr_irqs, priv->nr_idcs); + } else { + pa = priv->msicfg.base_ppn << APLIC_xMSICFGADDR_PPN_SHIFT; + dev_info(dev, "%d interrupts forwared to MSI base %pa\n", + priv->nr_irqs, &pa); + } + + return 0; +} + +static int aplic_remove(struct platform_device *pdev) +{ + struct aplic_priv *priv = platform_get_drvdata(pdev); + + irq_domain_remove(priv->irqdomain); + + return 0; +} + +static const struct of_device_id aplic_match[] = { + { .compatible = "riscv,aplic" }, + {} +}; + +static struct platform_driver aplic_driver = { + .driver = { + .name = "riscv-aplic", + .of_match_table = aplic_match, + }, + .probe = aplic_probe, + .remove = aplic_remove, +}; + +static int __init aplic_init(void) +{ + return platform_driver_register(&aplic_driver); +} +core_initcall(aplic_init); diff --git a/include/linux/irqchip/riscv-aplic.h b/include/linux/irqchip/riscv-aplic.h new file mode 100644 index 000000000000..88177eefd411 --- /dev/null +++ b/include/linux/irqchip/riscv-aplic.h @@ -0,0 +1,117 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2021 Western Digital Corporation or its affiliates. + * Copyright (C) 2022 Ventana Micro Systems Inc. + */ +#ifndef __LINUX_IRQCHIP_RISCV_APLIC_H +#define __LINUX_IRQCHIP_RISCV_APLIC_H + +#include <linux/bitops.h> + +#define APLIC_MAX_IDC BIT(14) +#define APLIC_MAX_SOURCE 1024 + +#define APLIC_DOMAINCFG 0x0000 +#define APLIC_DOMAINCFG_RDONLY 0x80000000 +#define APLIC_DOMAINCFG_IE BIT(8) +#define APLIC_DOMAINCFG_DM BIT(2) +#define APLIC_DOMAINCFG_BE BIT(0) + +#define APLIC_SOURCECFG_BASE 0x0004 +#define APLIC_SOURCECFG_D BIT(10) +#define APLIC_SOURCECFG_CHILDIDX_MASK 0x000003ff +#define APLIC_SOURCECFG_SM_MASK 0x00000007 +#define APLIC_SOURCECFG_SM_INACTIVE 0x0 +#define APLIC_SOURCECFG_SM_DETACH 0x1 +#define APLIC_SOURCECFG_SM_EDGE_RISE 0x4 +#define APLIC_SOURCECFG_SM_EDGE_FALL 0x5 +#define APLIC_SOURCECFG_SM_LEVEL_HIGH 0x6 +#define APLIC_SOURCECFG_SM_LEVEL_LOW 0x7 + +#define APLIC_MMSICFGADDR 0x1bc0 +#define APLIC_MMSICFGADDRH 0x1bc4 +#define APLIC_SMSICFGADDR 0x1bc8 +#define APLIC_SMSICFGADDRH 0x1bcc + +#ifdef CONFIG_RISCV_M_MODE +#define APLIC_xMSICFGADDR APLIC_MMSICFGADDR +#define APLIC_xMSICFGADDRH APLIC_MMSICFGADDRH +#else +#define APLIC_xMSICFGADDR APLIC_SMSICFGADDR +#define APLIC_xMSICFGADDRH APLIC_SMSICFGADDRH +#endif + +#define APLIC_xMSICFGADDRH_L BIT(31) +#define APLIC_xMSICFGADDRH_HHXS_MASK 0x1f +#define APLIC_xMSICFGADDRH_HHXS_SHIFT 24 +#define APLIC_xMSICFGADDRH_LHXS_MASK 0x7 +#define APLIC_xMSICFGADDRH_LHXS_SHIFT 20 +#define APLIC_xMSICFGADDRH_HHXW_MASK 0x7 +#define APLIC_xMSICFGADDRH_HHXW_SHIFT 16 +#define APLIC_xMSICFGADDRH_LHXW_MASK 0xf +#define APLIC_xMSICFGADDRH_LHXW_SHIFT 12 +#define APLIC_xMSICFGADDRH_BAPPN_MASK 0xfff + +#define APLIC_xMSICFGADDR_PPN_SHIFT 12 + +#define APLIC_xMSICFGADDR_PPN_HART(__lhxs) \ + (BIT(__lhxs) - 1) + +#define APLIC_xMSICFGADDR_PPN_LHX_MASK(__lhxw) \ + (BIT(__lhxw) - 1) +#define APLIC_xMSICFGADDR_PPN_LHX_SHIFT(__lhxs) \ + ((__lhxs)) +#define APLIC_xMSICFGADDR_PPN_LHX(__lhxw, __lhxs) \ + (APLIC_xMSICFGADDR_PPN_LHX_MASK(__lhxw) << \ + APLIC_xMSICFGADDR_PPN_LHX_SHIFT(__lhxs)) + +#define APLIC_xMSICFGADDR_PPN_HHX_MASK(__hhxw) \ + (BIT(__hhxw) - 1) +#define APLIC_xMSICFGADDR_PPN_HHX_SHIFT(__hhxs) \ + ((__hhxs) + APLIC_xMSICFGADDR_PPN_SHIFT) +#define APLIC_xMSICFGADDR_PPN_HHX(__hhxw, __hhxs) \ + (APLIC_xMSICFGADDR_PPN_HHX_MASK(__hhxw) << \ + APLIC_xMSICFGADDR_PPN_HHX_SHIFT(__hhxs)) + +#define APLIC_SETIP_BASE 0x1c00 +#define APLIC_SETIPNUM 0x1cdc + +#define APLIC_CLRIP_BASE 0x1d00 +#define APLIC_CLRIPNUM 0x1ddc + +#define APLIC_SETIE_BASE 0x1e00 +#define APLIC_SETIENUM 0x1edc + +#define APLIC_CLRIE_BASE 0x1f00 +#define APLIC_CLRIENUM 0x1fdc + +#define APLIC_SETIPNUM_LE 0x2000 +#define APLIC_SETIPNUM_BE 0x2004 + +#define APLIC_GENMSI 0x3000 + +#define APLIC_TARGET_BASE 0x3004 +#define APLIC_TARGET_HART_IDX_SHIFT 18 +#define APLIC_TARGET_HART_IDX_MASK 0x3fff +#define APLIC_TARGET_GUEST_IDX_SHIFT 12 +#define APLIC_TARGET_GUEST_IDX_MASK 0x3f +#define APLIC_TARGET_IPRIO_MASK 0xff +#define APLIC_TARGET_EIID_MASK 0x7ff + +#define APLIC_IDC_BASE 0x4000 +#define APLIC_IDC_SIZE 32 + +#define APLIC_IDC_IDELIVERY 0x00 + +#define APLIC_IDC_IFORCE 0x04 + +#define APLIC_IDC_ITHRESHOLD 0x08 + +#define APLIC_IDC_TOPI 0x18 +#define APLIC_IDC_TOPI_ID_SHIFT 16 +#define APLIC_IDC_TOPI_ID_MASK 0x3ff +#define APLIC_IDC_TOPI_PRIO_MASK 0xff + +#define APLIC_IDC_CLAIMI 0x1c + +#endif
The RISC-V advanced interrupt architecture (AIA) specification defines a new interrupt controller for managing wired interrupts on a RISC-V platform. This new interrupt controller is referred to as advanced platform-level interrupt controller (APLIC) which can forward wired interrupts to CPUs (or HARTs) as local interrupts OR as message signaled interrupts. (For more details refer https://github.com/riscv/riscv-aia) This patch adds an irqchip driver for RISC-V APLIC found on RISC-V platforms. Signed-off-by: Anup Patel <apatel@ventanamicro.com> --- drivers/irqchip/Kconfig | 12 + drivers/irqchip/Makefile | 1 + drivers/irqchip/irq-riscv-aplic.c | 656 ++++++++++++++++++++++++++++ include/linux/irqchip/riscv-aplic.h | 117 +++++ 4 files changed, 786 insertions(+) create mode 100644 drivers/irqchip/irq-riscv-aplic.c create mode 100644 include/linux/irqchip/riscv-aplic.h