On Mon, Jul 10, 2023 at 2:44 AM Anup Patel <apatel@xxxxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxxx> > --- > drivers/irqchip/Kconfig | 6 + > drivers/irqchip/Makefile | 1 + > drivers/irqchip/irq-riscv-aplic.c | 774 ++++++++++++++++++++++++++++ > include/linux/irqchip/riscv-aplic.h | 119 +++++ > 4 files changed, 900 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 d700980372ef..834c0329f583 100644 > --- a/drivers/irqchip/Kconfig > +++ b/drivers/irqchip/Kconfig > @@ -544,6 +544,12 @@ config SIFIVE_PLIC > select IRQ_DOMAIN_HIERARCHY > select GENERIC_IRQ_EFFECTIVE_AFF_MASK if SMP > > +config RISCV_APLIC > + bool > + depends on RISCV > + select IRQ_DOMAIN_HIERARCHY > + select GENERIC_MSI_IRQ > + > config RISCV_IMSIC > bool > depends on RISCV > diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile > index 577bde3e986b..438b8e1a152c 100644 > --- a/drivers/irqchip/Makefile > +++ b/drivers/irqchip/Makefile > @@ -95,6 +95,7 @@ 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..b4db29d4179b > --- /dev/null > +++ b/drivers/irqchip/irq-riscv-aplic.c > @@ -0,0 +1,774 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Copyright (C) 2021 Western Digital Corporation or its affiliates. > + * Copyright (C) 2022 Ventana Micro Systems Inc. > + */ > + > +#define pr_fmt(fmt) "riscv-aplic: " fmt > +#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/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 fwnode_handle *fwnode; > + u32 gsi_base; > + 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; > +} > + > +static void aplic_irq_eoi(struct irq_data *d) > +{ > + struct aplic_priv *priv = irq_data_get_irq_chip_data(d); > + u32 reg_off, reg_mask; > + > + /* > + * EOI handling only required only for level-triggered > + * interrupts in APLIC MSI mode. > + */ > + > + if (priv->nr_idcs) > + return; > + > + reg_off = APLIC_CLRIP_BASE + ((d->hwirq / APLIC_IRQBITS_PER_REG) * 4); > + reg_mask = BIT(d->hwirq % APLIC_IRQBITS_PER_REG); > + switch (irqd_get_trigger_type(d)) { > + case IRQ_TYPE_LEVEL_LOW: > + if (!(readl(priv->regs + reg_off) & reg_mask)) > + writel(d->hwirq, priv->regs + APLIC_SETIPNUM_LE); > + break; > + case IRQ_TYPE_LEVEL_HIGH: > + if (readl(priv->regs + reg_off) & reg_mask) > + writel(d->hwirq, priv->regs + APLIC_SETIPNUM_LE); > + break; > + } > +} > + > +#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, > + .irq_eoi = aplic_irq_eoi, > +#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_fwspec *fwspec, > + u32 gsi_base, > + unsigned long *hwirq, > + unsigned int *type) > +{ > + if (WARN_ON(fwspec->param_count < 2)) > + return -EINVAL; > + if (WARN_ON(!fwspec->param[0])) > + return -EINVAL; > + > + /* For DT, gsi_base is always zero. */ > + *hwirq = fwspec->param[0] - gsi_base; > + *type = fwspec->param[1] & IRQ_TYPE_SENSE_MASK; > + > + WARN_ON(*type == IRQ_TYPE_NONE); > + > + return 0; > +} > + > +static int aplic_irqdomain_msi_translate(struct irq_domain *d, > + struct irq_fwspec *fwspec, > + unsigned long *hwirq, > + unsigned int *type) > +{ > + struct aplic_priv *priv = platform_msi_get_host_data(d); > + > + return aplic_irqdomain_translate(fwspec, priv->gsi_base, hwirq, type); > +} > + > +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(fwspec, priv->gsi_base, &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_info(domain, virq + i, hwirq + i, > + &aplic_chip, priv, handle_fasteoi_irq, > + NULL, NULL); > + /* > + * APLIC does not implement irq_disable() so Linux interrupt > + * subsystem will take a lazy approach for disabling an APLIC > + * interrupt. This means APLIC interrupts are left unmasked > + * upon system suspend and interrupts are not processed > + * immediately upon system wake up. To tackle this, we disable > + * the lazy approach for all APLIC interrupts. > + */ > + irq_set_status_flags(virq + i, IRQ_DISABLE_UNLAZY); > + } > + > + return 0; > +} > + > +static const struct irq_domain_ops aplic_irqdomain_msi_ops = { > + .translate = aplic_irqdomain_msi_translate, > + .alloc = aplic_irqdomain_msi_alloc, > + .free = platform_msi_device_domain_free, > +}; > + > +static int aplic_irqdomain_idc_translate(struct irq_domain *d, > + struct irq_fwspec *fwspec, > + unsigned long *hwirq, > + unsigned int *type) > +{ > + struct aplic_priv *priv = d->host_data; > + > + return aplic_irqdomain_translate(fwspec, priv->gsi_base, hwirq, type); > +} > + > +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(fwspec, priv->gsi_base, &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_fasteoi_irq, > + NULL, NULL); > + irq_set_affinity(virq + i, &priv->lmask); > + /* See the reason described in aplic_irqdomain_msi_alloc() */ > + irq_set_status_flags(virq + i, IRQ_DISABLE_UNLAZY); > + } > + > + return 0; > +} > + > +static const struct irq_domain_ops aplic_irqdomain_idc_ops = { > + .translate = aplic_irqdomain_idc_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) > + pr_warn("%pfwP: unable to write 0x%x in domaincfg\n", > + priv->fwnode, 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 irq_data *d = irq_get_irq_data(desc->irq); > + struct aplic_priv *priv = irq_data_get_irq_chip_data(d); > + struct aplic_msicfg *mc = &priv->msicfg; > + phys_addr_t tppn, tbppn, msg_addr; > + void __iomem *target; > + > + /* For zeroed MSI, simply write zero into the target register */ > + if (!msg->address_hi && !msg->address_lo && !msg->data) { > + target = priv->regs + APLIC_TARGET_BASE; > + target += (d->hwirq - 1) * sizeof(u32); > + writel(0, target); > + return; > + } > + > + /* Sanity check on message data */ > + WARN_ON(msg->data > APLIC_TARGET_EIID_MASK); > + > + /* Compute target MSI address */ > + msg_addr = (((u64)msg->address_hi) << 32) | msg->address_lo; > + 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 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) { > + pr_err("%pfwP: IMSIC global config not found\n", > + priv->fwnode); > + return -ENODEV; > + } > + > + /* Find number of guest index bits (LHXS) */ > + mc->lhxs = imsic_global->guest_index_bits; > + if (APLIC_xMSICFGADDRH_LHXS_MASK < mc->lhxs) { > + pr_err("%pfwP: IMSIC guest index bits big for APLIC LHXS\n", > + priv->fwnode); > + return -EINVAL; > + } > + > + /* Find number of HART index bits (LHXW) */ > + mc->lhxw = imsic_global->hart_index_bits; > + if (APLIC_xMSICFGADDRH_LHXW_MASK < mc->lhxw) { > + pr_err("%pfwP: IMSIC hart index bits big for APLIC LHXW\n", > + priv->fwnode); > + return -EINVAL; > + } > + > + /* Find number of group index bits (HHXW) */ > + mc->hhxw = imsic_global->group_index_bits; > + if (APLIC_xMSICFGADDRH_HHXW_MASK < mc->hhxw) { > + pr_err("%pfwP: IMSIC group index bits big for APLIC HHXW\n", > + priv->fwnode); > + 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)) { > + pr_err("%pfwP: IMSIC group index shift should be >= %d\n", > + priv->fwnode, (2 * APLIC_xMSICFGADDR_PPN_SHIFT)); > + return -EINVAL; > + } > + mc->hhxs -= (2 * APLIC_xMSICFGADDR_PPN_SHIFT); > + if (APLIC_xMSICFGADDRH_HHXS_MASK < mc->hhxs) { > + pr_err("%pfwP: IMSIC group index shift big for APLIC HHXS\n", > + priv->fwnode); > + 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 fwnode_reference_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++) { > + rc = fwnode_property_get_reference_args(priv->fwnode, > + "interrupts-extended", "#interrupt-cells", > + 0, i, &parent); > + if (rc) { > + pr_warn("%pfwP: parent irq for IDC%d not found\n", > + priv->fwnode, i); > + continue; > + } > + > + /* > + * Skip interrupts other than external interrupts for > + * current privilege level. > + */ > + if (parent.args[0] != RV_IRQ_EXT) > + continue; > + > + rc = riscv_fw_parent_hartid(parent.fwnode, &hartid); > + if (rc) { > + pr_warn("%pfwP: invalid hartid for IDC%d\n", > + priv->fwnode, i); > + continue; > + } > + > + cpu = riscv_hartid_to_cpuid(hartid); > + if (cpu < 0) { > + pr_warn("%pfwP: invalid cpuid for IDC%d\n", > + priv->fwnode, i); > + continue; > + } > + > + cpumask_set_cpu(cpu, &priv->lmask); > + > + idc = per_cpu_ptr(&aplic_idcs, cpu); > + 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 fwnode_handle *fwnode = pdev->dev.fwnode; > + struct fwnode_reference_args parent; > + struct aplic_priv *priv; > + struct resource *res; > + phys_addr_t pa; > + int rc; > + > + priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL); > + if (!priv) > + return -ENOMEM; > + priv->fwnode = fwnode; > + > + /* Map the MMIO registers */ > + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); > + if (!res) { > + pr_err("%pfwP: failed to get MMIO resource\n", fwnode); > + return -EINVAL; > + } > + priv->regs = devm_ioremap(&pdev->dev, res->start, resource_size(res)); > + if (!priv->regs) { > + pr_err("%pfwP: failed map MMIO registers\n", fwnode); > + return -ENOMEM; > + } > + > + /* > + * Find out GSI base number > + * > + * Note: DT does not define "riscv,gsi-base" property so GSI > + * base is always zero for DT. > + */ > + rc = fwnode_property_read_u32_array(fwnode, "riscv,gsi-base", > + &priv->gsi_base, 1); > + if (rc) > + priv->gsi_base = 0; > + > + /* Find out number of interrupt sources */ > + rc = fwnode_property_read_u32_array(fwnode, "riscv,num-sources", > + &priv->nr_irqs, 1); > + if (rc) { > + pr_err("%pfwP: failed to get number of interrupt sources\n", > + fwnode); > + return rc; > + } > + > + /* Setup initial state APLIC interrupts */ > + aplic_init_hw_irqs(priv); > + > + /* > + * Find out number of IDCs based on parent interrupts > + * > + * If "msi-parent" property is present then we ignore the > + * APLIC IDCs which forces the APLIC driver to use MSI mode. > + */ > + if (!fwnode_property_present(fwnode, "msi-parent")) { > + while (!fwnode_property_get_reference_args(fwnode, > + "interrupts-extended", "#interrupt-cells", > + 0, priv->nr_idcs, &parent)) > + priv->nr_idcs++; > + } > + > + /* Setup IDCs or MSIs based on number of IDCs */ > + if (priv->nr_idcs) > + rc = aplic_setup_idc(priv); > + else > + rc = aplic_setup_msi(priv); > + if (rc) { > + pr_err("%pfwP: failed setup %s\n", > + fwnode, priv->nr_idcs ? "IDCs" : "MSIs"); > + 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( > + priv->fwnode, > + priv->nr_irqs + 1, > + &aplic_irqdomain_idc_ops, > + priv); > + else > + priv->irqdomain = platform_msi_create_device_domain( > + &pdev->dev, > + priv->nr_irqs + 1, > + aplic_msi_write_msg, > + &aplic_irqdomain_msi_ops, > + priv); > + if (!priv->irqdomain) { > + pr_err("%pfwP: failed to add irq domain\n", priv->fwnode); > + return -ENOMEM; > + } > + > + /* Advertise the interrupt controller */ > + if (priv->nr_idcs) { > + pr_info("%pfwP: %d interrupts directly connected to %d CPUs\n", > + priv->fwnode, priv->nr_irqs, priv->nr_idcs); > + } else { > + pa = priv->msicfg.base_ppn << APLIC_xMSICFGADDR_PPN_SHIFT; > + pr_info("%pfwP: %d interrupts forwared to MSI base %pa\n", > + priv->fwnode, priv->nr_irqs, &pa); > + } > + > + 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, > +}; > + > +static int __init aplic_init(void) > +{ > + /* > + * Register APLIC driver as early as possible so that APLIC > + * platform device is probed as soon as it is created. > + */ > + return platform_driver_register(&aplic_driver); > +} > +core_initcall(aplic_init); > + > +static int __init aplic_dt_init(struct device_node *node, > + struct device_node *parent) > +{ > + /* > + * The APLIC platform driver needs to be probed early > + * so for device tree: > + * > + * 1) Set the FWNODE_FLAG_BEST_EFFORT flag in fwnode which > + * provides a hint to the device driver core to probe the > + * platform driver early. > + * 2) Clear the OF_POPULATED flag in device_node because > + * of_irq_init() sets it which prevents creation of > + * platform device. > + */ > + node->fwnode.flags |= FWNODE_FLAG_BEST_EFFORT; Please stop spamming us with broken patches. Already told you this is not an option. Nack. -Saravana > + of_node_clear_flag(node, OF_POPULATED); > + return 0; > +} > +IRQCHIP_DECLARE(riscv_aplic, "riscv,aplic", aplic_dt_init); > diff --git a/include/linux/irqchip/riscv-aplic.h b/include/linux/irqchip/riscv-aplic.h > new file mode 100644 > index 000000000000..97e198ea0109 > --- /dev/null > +++ b/include/linux/irqchip/riscv-aplic.h > @@ -0,0 +1,119 @@ > +/* 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_IRQBITS_PER_REG 32 > + > +#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 >
