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![Thomas Gleixner](/assets/img/avatar_default.png)
I'm really grumpy about this one. The line: #include "../../../kernel/irq/settings.h" should have been an alarm sign for all people who added their SOB to this trainwreck. When I cleaned up the mess people made with interrupt descriptors a few years ago, I warned that I'm going to hunt down new offenders and treat them with stinking trouts. In this case I'll use frozen shark for a better educational value. The whole idiocy which was done there could have been avoided with two lines of perfectly fine code. And do not complain about the lack of correct examples in tree. The solution is simple: Remove the brainfart and use the proper functions, which should have been used in the first place Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Ashish Kalra <ashish.kalra@freescale.com> Cc: Timur Tabi <timur@freescale.com> Cc: Kumar Gala <galak@kernel.crashing.org> Cc: ppc <linuxppc-dev@lists.ozlabs.org> Link: http://lkml.kernel.org/r/20140223212736.451970660@linutronix.de Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
296 lines
7.2 KiB
C
296 lines
7.2 KiB
C
/*
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* Driver for ePAPR Embedded Hypervisor PIC
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*
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* Copyright 2008-2011 Freescale Semiconductor, Inc.
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*
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* Author: Ashish Kalra <ashish.kalra@freescale.com>
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/irq.h>
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#include <linux/smp.h>
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#include <linux/interrupt.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <asm/io.h>
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#include <asm/irq.h>
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#include <asm/smp.h>
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#include <asm/machdep.h>
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#include <asm/ehv_pic.h>
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#include <asm/fsl_hcalls.h>
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static struct ehv_pic *global_ehv_pic;
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static DEFINE_SPINLOCK(ehv_pic_lock);
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static u32 hwirq_intspec[NR_EHV_PIC_INTS];
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static u32 __iomem *mpic_percpu_base_vaddr;
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#define IRQ_TYPE_MPIC_DIRECT 4
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#define MPIC_EOI 0x00B0
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/*
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* Linux descriptor level callbacks
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*/
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void ehv_pic_unmask_irq(struct irq_data *d)
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{
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unsigned int src = virq_to_hw(d->irq);
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ev_int_set_mask(src, 0);
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}
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void ehv_pic_mask_irq(struct irq_data *d)
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{
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unsigned int src = virq_to_hw(d->irq);
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ev_int_set_mask(src, 1);
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}
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void ehv_pic_end_irq(struct irq_data *d)
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{
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unsigned int src = virq_to_hw(d->irq);
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ev_int_eoi(src);
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}
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void ehv_pic_direct_end_irq(struct irq_data *d)
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{
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out_be32(mpic_percpu_base_vaddr + MPIC_EOI / 4, 0);
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}
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int ehv_pic_set_affinity(struct irq_data *d, const struct cpumask *dest,
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bool force)
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{
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unsigned int src = virq_to_hw(d->irq);
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unsigned int config, prio, cpu_dest;
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int cpuid = irq_choose_cpu(dest);
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unsigned long flags;
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spin_lock_irqsave(&ehv_pic_lock, flags);
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ev_int_get_config(src, &config, &prio, &cpu_dest);
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ev_int_set_config(src, config, prio, cpuid);
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spin_unlock_irqrestore(&ehv_pic_lock, flags);
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return IRQ_SET_MASK_OK;
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}
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static unsigned int ehv_pic_type_to_vecpri(unsigned int type)
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{
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/* Now convert sense value */
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switch (type & IRQ_TYPE_SENSE_MASK) {
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case IRQ_TYPE_EDGE_RISING:
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return EHV_PIC_INFO(VECPRI_SENSE_EDGE) |
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EHV_PIC_INFO(VECPRI_POLARITY_POSITIVE);
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case IRQ_TYPE_EDGE_FALLING:
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case IRQ_TYPE_EDGE_BOTH:
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return EHV_PIC_INFO(VECPRI_SENSE_EDGE) |
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EHV_PIC_INFO(VECPRI_POLARITY_NEGATIVE);
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case IRQ_TYPE_LEVEL_HIGH:
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return EHV_PIC_INFO(VECPRI_SENSE_LEVEL) |
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EHV_PIC_INFO(VECPRI_POLARITY_POSITIVE);
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case IRQ_TYPE_LEVEL_LOW:
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default:
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return EHV_PIC_INFO(VECPRI_SENSE_LEVEL) |
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EHV_PIC_INFO(VECPRI_POLARITY_NEGATIVE);
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}
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}
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int ehv_pic_set_irq_type(struct irq_data *d, unsigned int flow_type)
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{
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unsigned int src = virq_to_hw(d->irq);
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unsigned int vecpri, vold, vnew, prio, cpu_dest;
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unsigned long flags;
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if (flow_type == IRQ_TYPE_NONE)
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flow_type = IRQ_TYPE_LEVEL_LOW;
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irqd_set_trigger_type(d, flow_type);
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vecpri = ehv_pic_type_to_vecpri(flow_type);
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spin_lock_irqsave(&ehv_pic_lock, flags);
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ev_int_get_config(src, &vold, &prio, &cpu_dest);
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vnew = vold & ~(EHV_PIC_INFO(VECPRI_POLARITY_MASK) |
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EHV_PIC_INFO(VECPRI_SENSE_MASK));
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vnew |= vecpri;
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/*
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* TODO : Add specific interface call for platform to set
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* individual interrupt priorities.
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* platform currently using static/default priority for all ints
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*/
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prio = 8;
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ev_int_set_config(src, vecpri, prio, cpu_dest);
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spin_unlock_irqrestore(&ehv_pic_lock, flags);
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return IRQ_SET_MASK_OK_NOCOPY;
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}
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static struct irq_chip ehv_pic_irq_chip = {
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.irq_mask = ehv_pic_mask_irq,
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.irq_unmask = ehv_pic_unmask_irq,
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.irq_eoi = ehv_pic_end_irq,
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.irq_set_type = ehv_pic_set_irq_type,
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};
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static struct irq_chip ehv_pic_direct_eoi_irq_chip = {
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.irq_mask = ehv_pic_mask_irq,
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.irq_unmask = ehv_pic_unmask_irq,
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.irq_eoi = ehv_pic_direct_end_irq,
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.irq_set_type = ehv_pic_set_irq_type,
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};
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/* Return an interrupt vector or NO_IRQ if no interrupt is pending. */
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unsigned int ehv_pic_get_irq(void)
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{
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int irq;
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BUG_ON(global_ehv_pic == NULL);
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if (global_ehv_pic->coreint_flag)
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irq = mfspr(SPRN_EPR); /* if core int mode */
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else
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ev_int_iack(0, &irq); /* legacy mode */
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if (irq == 0xFFFF) /* 0xFFFF --> no irq is pending */
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return NO_IRQ;
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/*
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* this will also setup revmap[] in the slow path for the first
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* time, next calls will always use fast path by indexing revmap
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*/
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return irq_linear_revmap(global_ehv_pic->irqhost, irq);
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}
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static int ehv_pic_host_match(struct irq_domain *h, struct device_node *node)
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{
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/* Exact match, unless ehv_pic node is NULL */
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return h->of_node == NULL || h->of_node == node;
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}
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static int ehv_pic_host_map(struct irq_domain *h, unsigned int virq,
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irq_hw_number_t hw)
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{
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struct ehv_pic *ehv_pic = h->host_data;
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struct irq_chip *chip;
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/* Default chip */
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chip = &ehv_pic->hc_irq;
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if (mpic_percpu_base_vaddr)
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if (hwirq_intspec[hw] & IRQ_TYPE_MPIC_DIRECT)
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chip = &ehv_pic_direct_eoi_irq_chip;
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irq_set_chip_data(virq, chip);
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/*
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* using handle_fasteoi_irq as our irq handler, this will
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* only call the eoi callback and suitable for the MPIC
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* controller which set ISR/IPR automatically and clear the
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* highest priority active interrupt in ISR/IPR when we do
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* a specific eoi
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*/
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irq_set_chip_and_handler(virq, chip, handle_fasteoi_irq);
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/* Set default irq type */
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irq_set_irq_type(virq, IRQ_TYPE_NONE);
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return 0;
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}
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static int ehv_pic_host_xlate(struct irq_domain *h, struct device_node *ct,
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const u32 *intspec, unsigned int intsize,
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irq_hw_number_t *out_hwirq, unsigned int *out_flags)
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{
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/*
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* interrupt sense values coming from the guest device tree
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* interrupt specifiers can have four possible sense and
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* level encoding information and they need to
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* be translated between firmware type & linux type.
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*/
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static unsigned char map_of_senses_to_linux_irqtype[4] = {
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IRQ_TYPE_EDGE_FALLING,
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IRQ_TYPE_EDGE_RISING,
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IRQ_TYPE_LEVEL_LOW,
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IRQ_TYPE_LEVEL_HIGH,
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};
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*out_hwirq = intspec[0];
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if (intsize > 1) {
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hwirq_intspec[intspec[0]] = intspec[1];
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*out_flags = map_of_senses_to_linux_irqtype[intspec[1] &
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~IRQ_TYPE_MPIC_DIRECT];
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} else {
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*out_flags = IRQ_TYPE_NONE;
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}
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return 0;
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}
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static const struct irq_domain_ops ehv_pic_host_ops = {
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.match = ehv_pic_host_match,
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.map = ehv_pic_host_map,
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.xlate = ehv_pic_host_xlate,
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};
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void __init ehv_pic_init(void)
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{
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struct device_node *np, *np2;
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struct ehv_pic *ehv_pic;
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int coreint_flag = 1;
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np = of_find_compatible_node(NULL, NULL, "epapr,hv-pic");
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if (!np) {
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pr_err("ehv_pic_init: could not find epapr,hv-pic node\n");
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return;
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}
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if (!of_find_property(np, "has-external-proxy", NULL))
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coreint_flag = 0;
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ehv_pic = kzalloc(sizeof(struct ehv_pic), GFP_KERNEL);
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if (!ehv_pic) {
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of_node_put(np);
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return;
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}
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ehv_pic->irqhost = irq_domain_add_linear(np, NR_EHV_PIC_INTS,
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&ehv_pic_host_ops, ehv_pic);
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if (!ehv_pic->irqhost) {
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of_node_put(np);
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kfree(ehv_pic);
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return;
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}
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np2 = of_find_compatible_node(NULL, NULL, "fsl,hv-mpic-per-cpu");
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if (np2) {
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mpic_percpu_base_vaddr = of_iomap(np2, 0);
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if (!mpic_percpu_base_vaddr)
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pr_err("ehv_pic_init: of_iomap failed\n");
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of_node_put(np2);
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}
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ehv_pic->hc_irq = ehv_pic_irq_chip;
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ehv_pic->hc_irq.irq_set_affinity = ehv_pic_set_affinity;
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ehv_pic->coreint_flag = coreint_flag;
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global_ehv_pic = ehv_pic;
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irq_set_default_host(global_ehv_pic->irqhost);
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}
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