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Diffstat (limited to 'arch/mips/netlogic/common/irq.c')
| -rw-r--r-- | arch/mips/netlogic/common/irq.c | 354 |
1 files changed, 354 insertions, 0 deletions
diff --git a/arch/mips/netlogic/common/irq.c b/arch/mips/netlogic/common/irq.c new file mode 100644 index 000000000..5f5d18b0e --- /dev/null +++ b/arch/mips/netlogic/common/irq.c @@ -0,0 +1,354 @@ +/* + * Copyright 2003-2011 NetLogic Microsystems, Inc. (NetLogic). All rights + * reserved. + * + * This software is available to you under a choice of one of two + * licenses. You may choose to be licensed under the terms of the GNU + * General Public License (GPL) Version 2, available from the file + * COPYING in the main directory of this source tree, or the NetLogic + * license below: + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * + * THIS SOFTWARE IS PROVIDED BY NETLOGIC ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR + * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, + * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE + * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN + * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <linux/kernel.h> +#include <linux/init.h> +#include <linux/linkage.h> +#include <linux/interrupt.h> +#include <linux/mm.h> +#include <linux/slab.h> +#include <linux/irq.h> + +#include <linux/irqdomain.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> + +#include <asm/errno.h> +#include <asm/signal.h> +#include <asm/ptrace.h> +#include <asm/mipsregs.h> +#include <asm/thread_info.h> + +#include <asm/netlogic/mips-extns.h> +#include <asm/netlogic/interrupt.h> +#include <asm/netlogic/haldefs.h> +#include <asm/netlogic/common.h> + +#if defined(CONFIG_CPU_XLP) +#include <asm/netlogic/xlp-hal/iomap.h> +#include <asm/netlogic/xlp-hal/xlp.h> +#include <asm/netlogic/xlp-hal/pic.h> +#elif defined(CONFIG_CPU_XLR) +#include <asm/netlogic/xlr/iomap.h> +#include <asm/netlogic/xlr/pic.h> +#include <asm/netlogic/xlr/fmn.h> +#else +#error "Unknown CPU" +#endif + +#ifdef CONFIG_SMP +#define SMP_IRQ_MASK ((1ULL << IRQ_IPI_SMP_FUNCTION) | \ + (1ULL << IRQ_IPI_SMP_RESCHEDULE)) +#else +#define SMP_IRQ_MASK 0 +#endif +#define PERCPU_IRQ_MASK (SMP_IRQ_MASK | (1ull << IRQ_TIMER) | \ + (1ull << IRQ_FMN)) + +struct nlm_pic_irq { + void (*extra_ack)(struct irq_data *); + struct nlm_soc_info *node; + int picirq; + int irt; + int flags; +}; + +static void xlp_pic_enable(struct irq_data *d) +{ + unsigned long flags; + struct nlm_pic_irq *pd = irq_data_get_irq_handler_data(d); + + BUG_ON(!pd); + spin_lock_irqsave(&pd->node->piclock, flags); + nlm_pic_enable_irt(pd->node->picbase, pd->irt); + spin_unlock_irqrestore(&pd->node->piclock, flags); +} + +static void xlp_pic_disable(struct irq_data *d) +{ + struct nlm_pic_irq *pd = irq_data_get_irq_handler_data(d); + unsigned long flags; + + BUG_ON(!pd); + spin_lock_irqsave(&pd->node->piclock, flags); + nlm_pic_disable_irt(pd->node->picbase, pd->irt); + spin_unlock_irqrestore(&pd->node->piclock, flags); +} + +static void xlp_pic_mask_ack(struct irq_data *d) +{ + struct nlm_pic_irq *pd = irq_data_get_irq_handler_data(d); + + clear_c0_eimr(pd->picirq); + ack_c0_eirr(pd->picirq); +} + +static void xlp_pic_unmask(struct irq_data *d) +{ + struct nlm_pic_irq *pd = irq_data_get_irq_handler_data(d); + + BUG_ON(!pd); + + if (pd->extra_ack) + pd->extra_ack(d); + + /* re-enable the intr on this cpu */ + set_c0_eimr(pd->picirq); + + /* Ack is a single write, no need to lock */ + nlm_pic_ack(pd->node->picbase, pd->irt); +} + +static struct irq_chip xlp_pic = { + .name = "XLP-PIC", + .irq_enable = xlp_pic_enable, + .irq_disable = xlp_pic_disable, + .irq_mask_ack = xlp_pic_mask_ack, + .irq_unmask = xlp_pic_unmask, +}; + +static void cpuintr_disable(struct irq_data *d) +{ + clear_c0_eimr(d->irq); +} + +static void cpuintr_enable(struct irq_data *d) +{ + set_c0_eimr(d->irq); +} + +static void cpuintr_ack(struct irq_data *d) +{ + ack_c0_eirr(d->irq); +} + +/* + * Chip definition for CPU originated interrupts(timer, msg) and + * IPIs + */ +struct irq_chip nlm_cpu_intr = { + .name = "XLP-CPU-INTR", + .irq_enable = cpuintr_enable, + .irq_disable = cpuintr_disable, + .irq_mask = cpuintr_disable, + .irq_ack = cpuintr_ack, + .irq_eoi = cpuintr_enable, +}; + +static void __init nlm_init_percpu_irqs(void) +{ + int i; + + for (i = 0; i < PIC_IRT_FIRST_IRQ; i++) + irq_set_chip_and_handler(i, &nlm_cpu_intr, handle_percpu_irq); +#ifdef CONFIG_SMP + irq_set_chip_and_handler(IRQ_IPI_SMP_FUNCTION, &nlm_cpu_intr, + nlm_smp_function_ipi_handler); + irq_set_chip_and_handler(IRQ_IPI_SMP_RESCHEDULE, &nlm_cpu_intr, + nlm_smp_resched_ipi_handler); +#endif +} + + +void nlm_setup_pic_irq(int node, int picirq, int irq, int irt) +{ + struct nlm_pic_irq *pic_data; + int xirq; + + xirq = nlm_irq_to_xirq(node, irq); + pic_data = kzalloc(sizeof(*pic_data), GFP_KERNEL); + BUG_ON(pic_data == NULL); + pic_data->irt = irt; + pic_data->picirq = picirq; + pic_data->node = nlm_get_node(node); + irq_set_chip_and_handler(xirq, &xlp_pic, handle_level_irq); + irq_set_handler_data(xirq, pic_data); +} + +void nlm_set_pic_extra_ack(int node, int irq, void (*xack)(struct irq_data *)) +{ + struct nlm_pic_irq *pic_data; + int xirq; + + xirq = nlm_irq_to_xirq(node, irq); + pic_data = irq_get_handler_data(xirq); + if (WARN_ON(!pic_data)) + return; + pic_data->extra_ack = xack; +} + +static void nlm_init_node_irqs(int node) +{ + struct nlm_soc_info *nodep; + int i, irt; + + pr_info("Init IRQ for node %d\n", node); + nodep = nlm_get_node(node); + nodep->irqmask = PERCPU_IRQ_MASK; + for (i = PIC_IRT_FIRST_IRQ; i <= PIC_IRT_LAST_IRQ; i++) { + irt = nlm_irq_to_irt(i); + if (irt == -1) /* unused irq */ + continue; + nodep->irqmask |= 1ull << i; + if (irt == -2) /* not a direct PIC irq */ + continue; + + nlm_pic_init_irt(nodep->picbase, irt, i, + node * nlm_threads_per_node(), 0); + nlm_setup_pic_irq(node, i, i, irt); + } +} + +void nlm_smp_irq_init(int hwtid) +{ + int cpu, node; + + cpu = hwtid % nlm_threads_per_node(); + node = hwtid / nlm_threads_per_node(); + + if (cpu == 0 && node != 0) + nlm_init_node_irqs(node); + write_c0_eimr(nlm_get_node(node)->irqmask); +} + +asmlinkage void plat_irq_dispatch(void) +{ + uint64_t eirr; + int i, node; + + node = nlm_nodeid(); + eirr = read_c0_eirr_and_eimr(); + if (eirr == 0) + return; + + i = __ffs64(eirr); + /* per-CPU IRQs don't need translation */ + if (i < PIC_IRQ_BASE) { + do_IRQ(i); + return; + } + +#if defined(CONFIG_PCI_MSI) && defined(CONFIG_CPU_XLP) + /* PCI interrupts need a second level dispatch for MSI bits */ + if (i >= PIC_PCIE_LINK_MSI_IRQ(0) && i <= PIC_PCIE_LINK_MSI_IRQ(3)) { + nlm_dispatch_msi(node, i); + return; + } + if (i >= PIC_PCIE_MSIX_IRQ(0) && i <= PIC_PCIE_MSIX_IRQ(3)) { + nlm_dispatch_msix(node, i); + return; + } + +#endif + /* top level irq handling */ + do_IRQ(nlm_irq_to_xirq(node, i)); +} + +#ifdef CONFIG_OF +static const struct irq_domain_ops xlp_pic_irq_domain_ops = { + .xlate = irq_domain_xlate_onetwocell, +}; + +static int __init xlp_of_pic_init(struct device_node *node, + struct device_node *parent) +{ + const int n_picirqs = PIC_IRT_LAST_IRQ - PIC_IRQ_BASE + 1; + struct irq_domain *xlp_pic_domain; + struct resource res; + int socid, ret, bus; + + /* we need a hack to get the PIC's SoC chip id */ + ret = of_address_to_resource(node, 0, &res); + if (ret < 0) { + pr_err("PIC %s: reg property not found!\n", node->name); + return -EINVAL; + } + + if (cpu_is_xlp9xx()) { + bus = (res.start >> 20) & 0xf; + for (socid = 0; socid < NLM_NR_NODES; socid++) { + if (!nlm_node_present(socid)) + continue; + if (nlm_get_node(socid)->socbus == bus) + break; + } + if (socid == NLM_NR_NODES) { + pr_err("PIC %s: Node mapping for bus %d not found!\n", + node->name, bus); + return -EINVAL; + } + } else { + socid = (res.start >> 18) & 0x3; + if (!nlm_node_present(socid)) { + pr_err("PIC %s: node %d does not exist!\n", + node->name, socid); + return -EINVAL; + } + } + + if (!nlm_node_present(socid)) { + pr_err("PIC %s: node %d does not exist!\n", node->name, socid); + return -EINVAL; + } + + xlp_pic_domain = irq_domain_add_legacy(node, n_picirqs, + nlm_irq_to_xirq(socid, PIC_IRQ_BASE), PIC_IRQ_BASE, + &xlp_pic_irq_domain_ops, NULL); + if (xlp_pic_domain == NULL) { + pr_err("PIC %s: Creating legacy domain failed!\n", node->name); + return -EINVAL; + } + pr_info("Node %d: IRQ domain created for PIC@%pR\n", socid, &res); + return 0; +} + +static struct of_device_id __initdata xlp_pic_irq_ids[] = { + { .compatible = "netlogic,xlp-pic", .data = xlp_of_pic_init }, + {}, +}; +#endif + +void __init arch_init_irq(void) +{ + /* Initialize the irq descriptors */ + nlm_init_percpu_irqs(); + nlm_init_node_irqs(0); + write_c0_eimr(nlm_current_node()->irqmask); +#if defined(CONFIG_CPU_XLR) + nlm_setup_fmn_irq(); +#endif +#if defined(CONFIG_OF) + of_irq_init(xlp_pic_irq_ids); +#endif +} |