518 lines
14 KiB
C
518 lines
14 KiB
C
/*
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* Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB
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* Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/mutex.h>
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#include <linux/of.h>
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#include <linux/of_platform.h>
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#include <linux/interrupt.h>
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#include <linux/of_device.h>
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#include <asm/oplib.h>
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#include <asm/timer.h>
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#include <asm/prom.h>
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#include <asm/leon.h>
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#include <asm/leon_amba.h>
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#include <asm/traps.h>
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#include <asm/cacheflush.h>
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#include <asm/smp.h>
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#include <asm/setup.h>
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#include "prom.h"
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#include "irq.h"
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struct leon3_irqctrl_regs_map *leon3_irqctrl_regs; /* interrupt controller base address */
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struct leon3_gptimer_regs_map *leon3_gptimer_regs; /* timer controller base address */
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int leondebug_irq_disable;
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int leon_debug_irqout;
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static int dummy_master_l10_counter;
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unsigned long amba_system_id;
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static DEFINE_SPINLOCK(leon_irq_lock);
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unsigned long leon3_gptimer_irq; /* interrupt controller irq number */
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unsigned long leon3_gptimer_idx; /* Timer Index (0..6) within Timer Core */
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int leon3_ticker_irq; /* Timer ticker IRQ */
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unsigned int sparc_leon_eirq;
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#define LEON_IMASK(cpu) (&leon3_irqctrl_regs->mask[cpu])
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#define LEON_IACK (&leon3_irqctrl_regs->iclear)
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#define LEON_DO_ACK_HW 1
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/* Return the last ACKed IRQ by the Extended IRQ controller. It has already
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* been (automatically) ACKed when the CPU takes the trap.
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*/
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static inline unsigned int leon_eirq_get(int cpu)
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{
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return LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->intid[cpu]) & 0x1f;
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}
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/* Handle one or multiple IRQs from the extended interrupt controller */
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static void leon_handle_ext_irq(unsigned int irq, struct irq_desc *desc)
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{
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unsigned int eirq;
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int cpu = sparc_leon3_cpuid();
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eirq = leon_eirq_get(cpu);
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if ((eirq & 0x10) && irq_map[eirq]->irq) /* bit4 tells if IRQ happened */
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generic_handle_irq(irq_map[eirq]->irq);
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}
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/* The extended IRQ controller has been found, this function registers it */
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void leon_eirq_setup(unsigned int eirq)
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{
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unsigned long mask, oldmask;
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unsigned int veirq;
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if (eirq < 1 || eirq > 0xf) {
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printk(KERN_ERR "LEON EXT IRQ NUMBER BAD: %d\n", eirq);
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return;
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}
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veirq = leon_build_device_irq(eirq, leon_handle_ext_irq, "extirq", 0);
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/*
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* Unmask the Extended IRQ, the IRQs routed through the Ext-IRQ
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* controller have a mask-bit of their own, so this is safe.
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*/
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irq_link(veirq);
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mask = 1 << eirq;
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oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(boot_cpu_id));
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LEON3_BYPASS_STORE_PA(LEON_IMASK(boot_cpu_id), (oldmask | mask));
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sparc_leon_eirq = eirq;
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}
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static inline unsigned long get_irqmask(unsigned int irq)
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{
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unsigned long mask;
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if (!irq || ((irq > 0xf) && !sparc_leon_eirq)
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|| ((irq > 0x1f) && sparc_leon_eirq)) {
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printk(KERN_ERR
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"leon_get_irqmask: false irq number: %d\n", irq);
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mask = 0;
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} else {
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mask = LEON_HARD_INT(irq);
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}
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return mask;
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}
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#ifdef CONFIG_SMP
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static int irq_choose_cpu(const struct cpumask *affinity)
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{
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cpumask_t mask;
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cpus_and(mask, cpu_online_map, *affinity);
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if (cpus_equal(mask, cpu_online_map) || cpus_empty(mask))
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return boot_cpu_id;
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else
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return first_cpu(mask);
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}
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#else
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#define irq_choose_cpu(affinity) boot_cpu_id
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#endif
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static int leon_set_affinity(struct irq_data *data, const struct cpumask *dest,
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bool force)
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{
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unsigned long mask, oldmask, flags;
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int oldcpu, newcpu;
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mask = (unsigned long)data->chip_data;
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oldcpu = irq_choose_cpu(data->affinity);
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newcpu = irq_choose_cpu(dest);
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if (oldcpu == newcpu)
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goto out;
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/* unmask on old CPU first before enabling on the selected CPU */
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spin_lock_irqsave(&leon_irq_lock, flags);
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oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(oldcpu));
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LEON3_BYPASS_STORE_PA(LEON_IMASK(oldcpu), (oldmask & ~mask));
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oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(newcpu));
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LEON3_BYPASS_STORE_PA(LEON_IMASK(newcpu), (oldmask | mask));
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spin_unlock_irqrestore(&leon_irq_lock, flags);
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out:
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return IRQ_SET_MASK_OK;
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}
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static void leon_unmask_irq(struct irq_data *data)
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{
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unsigned long mask, oldmask, flags;
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int cpu;
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mask = (unsigned long)data->chip_data;
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cpu = irq_choose_cpu(data->affinity);
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spin_lock_irqsave(&leon_irq_lock, flags);
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oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(cpu));
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LEON3_BYPASS_STORE_PA(LEON_IMASK(cpu), (oldmask | mask));
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spin_unlock_irqrestore(&leon_irq_lock, flags);
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}
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static void leon_mask_irq(struct irq_data *data)
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{
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unsigned long mask, oldmask, flags;
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int cpu;
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mask = (unsigned long)data->chip_data;
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cpu = irq_choose_cpu(data->affinity);
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spin_lock_irqsave(&leon_irq_lock, flags);
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oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(cpu));
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LEON3_BYPASS_STORE_PA(LEON_IMASK(cpu), (oldmask & ~mask));
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spin_unlock_irqrestore(&leon_irq_lock, flags);
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}
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static unsigned int leon_startup_irq(struct irq_data *data)
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{
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irq_link(data->irq);
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leon_unmask_irq(data);
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return 0;
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}
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static void leon_shutdown_irq(struct irq_data *data)
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{
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leon_mask_irq(data);
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irq_unlink(data->irq);
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}
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/* Used by external level sensitive IRQ handlers on the LEON: ACK IRQ ctrl */
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static void leon_eoi_irq(struct irq_data *data)
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{
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unsigned long mask = (unsigned long)data->chip_data;
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if (mask & LEON_DO_ACK_HW)
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LEON3_BYPASS_STORE_PA(LEON_IACK, mask & ~LEON_DO_ACK_HW);
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}
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static struct irq_chip leon_irq = {
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.name = "leon",
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.irq_startup = leon_startup_irq,
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.irq_shutdown = leon_shutdown_irq,
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.irq_mask = leon_mask_irq,
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.irq_unmask = leon_unmask_irq,
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.irq_eoi = leon_eoi_irq,
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.irq_set_affinity = leon_set_affinity,
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};
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/*
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* Build a LEON IRQ for the edge triggered LEON IRQ controller:
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* Edge (normal) IRQ - handle_simple_irq, ack=DONT-CARE, never ack
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* Level IRQ (PCI|Level-GPIO) - handle_fasteoi_irq, ack=1, ack after ISR
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* Per-CPU Edge - handle_percpu_irq, ack=0
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*/
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unsigned int leon_build_device_irq(unsigned int real_irq,
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irq_flow_handler_t flow_handler,
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const char *name, int do_ack)
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{
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unsigned int irq;
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unsigned long mask;
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irq = 0;
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mask = get_irqmask(real_irq);
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if (mask == 0)
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goto out;
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irq = irq_alloc(real_irq, real_irq);
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if (irq == 0)
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goto out;
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if (do_ack)
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mask |= LEON_DO_ACK_HW;
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irq_set_chip_and_handler_name(irq, &leon_irq,
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flow_handler, name);
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irq_set_chip_data(irq, (void *)mask);
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out:
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return irq;
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}
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static unsigned int _leon_build_device_irq(struct platform_device *op,
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unsigned int real_irq)
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{
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return leon_build_device_irq(real_irq, handle_simple_irq, "edge", 0);
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}
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void leon_update_virq_handling(unsigned int virq,
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irq_flow_handler_t flow_handler,
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const char *name, int do_ack)
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{
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unsigned long mask = (unsigned long)irq_get_chip_data(virq);
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mask &= ~LEON_DO_ACK_HW;
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if (do_ack)
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mask |= LEON_DO_ACK_HW;
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irq_set_chip_and_handler_name(virq, &leon_irq,
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flow_handler, name);
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irq_set_chip_data(virq, (void *)mask);
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}
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void __init leon_init_timers(irq_handler_t counter_fn)
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{
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int irq, eirq;
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struct device_node *rootnp, *np, *nnp;
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struct property *pp;
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int len;
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int icsel;
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int ampopts;
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int err;
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leondebug_irq_disable = 0;
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leon_debug_irqout = 0;
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master_l10_counter = (unsigned int *)&dummy_master_l10_counter;
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dummy_master_l10_counter = 0;
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rootnp = of_find_node_by_path("/ambapp0");
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if (!rootnp)
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goto bad;
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/* Find System ID: GRLIB build ID and optional CHIP ID */
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pp = of_find_property(rootnp, "systemid", &len);
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if (pp)
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amba_system_id = *(unsigned long *)pp->value;
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/* Find IRQMP IRQ Controller Registers base adr otherwise bail out */
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np = of_find_node_by_name(rootnp, "GAISLER_IRQMP");
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if (!np) {
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np = of_find_node_by_name(rootnp, "01_00d");
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if (!np)
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goto bad;
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}
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pp = of_find_property(np, "reg", &len);
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if (!pp)
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goto bad;
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leon3_irqctrl_regs = *(struct leon3_irqctrl_regs_map **)pp->value;
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/* Find GPTIMER Timer Registers base address otherwise bail out. */
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nnp = rootnp;
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do {
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np = of_find_node_by_name(nnp, "GAISLER_GPTIMER");
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if (!np) {
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np = of_find_node_by_name(nnp, "01_011");
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if (!np)
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goto bad;
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}
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ampopts = 0;
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pp = of_find_property(np, "ampopts", &len);
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if (pp) {
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ampopts = *(int *)pp->value;
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if (ampopts == 0) {
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/* Skip this instance, resource already
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* allocated by other OS */
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nnp = np;
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continue;
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}
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}
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/* Select Timer-Instance on Timer Core. Default is zero */
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leon3_gptimer_idx = ampopts & 0x7;
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pp = of_find_property(np, "reg", &len);
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if (pp)
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leon3_gptimer_regs = *(struct leon3_gptimer_regs_map **)
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pp->value;
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pp = of_find_property(np, "interrupts", &len);
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if (pp)
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leon3_gptimer_irq = *(unsigned int *)pp->value;
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} while (0);
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if (!(leon3_gptimer_regs && leon3_irqctrl_regs && leon3_gptimer_irq))
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goto bad;
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LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val, 0);
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LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].rld,
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(((1000000 / HZ) - 1)));
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LEON3_BYPASS_STORE_PA(
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&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl, 0);
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#ifdef CONFIG_SMP
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leon3_ticker_irq = leon3_gptimer_irq + 1 + leon3_gptimer_idx;
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if (!(LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config) &
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(1<<LEON3_GPTIMER_SEPIRQ))) {
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printk(KERN_ERR "timer not configured with separate irqs\n");
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BUG();
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}
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LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].val,
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0);
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LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].rld,
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(((1000000/HZ) - 1)));
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LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
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0);
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#endif
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/*
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* The IRQ controller may (if implemented) consist of multiple
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* IRQ controllers, each mapped on a 4Kb boundary.
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* Each CPU may be routed to different IRQCTRLs, however
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* we assume that all CPUs (in SMP system) is routed to the
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* same IRQ Controller, and for non-SMP only one IRQCTRL is
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* accessed anyway.
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* In AMP systems, Linux must run on CPU0 for the time being.
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*/
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icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[boot_cpu_id/8]);
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icsel = (icsel >> ((7 - (boot_cpu_id&0x7)) * 4)) & 0xf;
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leon3_irqctrl_regs += icsel;
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/* Mask all IRQs on boot-cpu IRQ controller */
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LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[boot_cpu_id], 0);
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/* Probe extended IRQ controller */
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eirq = (LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->mpstatus)
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>> 16) & 0xf;
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if (eirq != 0)
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leon_eirq_setup(eirq);
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irq = _leon_build_device_irq(NULL, leon3_gptimer_irq+leon3_gptimer_idx);
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err = request_irq(irq, counter_fn, IRQF_TIMER, "timer", NULL);
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if (err) {
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printk(KERN_ERR "unable to attach timer IRQ%d\n", irq);
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prom_halt();
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}
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#ifdef CONFIG_SMP
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{
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unsigned long flags;
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/*
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* In SMP, sun4m adds a IPI handler to IRQ trap handler that
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* LEON never must take, sun4d and LEON overwrites the branch
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* with a NOP.
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*/
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local_irq_save(flags);
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patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
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local_flush_cache_all();
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local_irq_restore(flags);
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}
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#endif
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LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl,
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LEON3_GPTIMER_EN |
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LEON3_GPTIMER_RL |
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LEON3_GPTIMER_LD |
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LEON3_GPTIMER_IRQEN);
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#ifdef CONFIG_SMP
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/* Install per-cpu IRQ handler for broadcasted ticker */
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irq = leon_build_device_irq(leon3_ticker_irq, handle_percpu_irq,
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"per-cpu", 0);
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err = request_irq(irq, leon_percpu_timer_interrupt,
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IRQF_PERCPU | IRQF_TIMER, "ticker",
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NULL);
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if (err) {
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printk(KERN_ERR "unable to attach ticker IRQ%d\n", irq);
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prom_halt();
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}
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LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
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LEON3_GPTIMER_EN |
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LEON3_GPTIMER_RL |
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LEON3_GPTIMER_LD |
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LEON3_GPTIMER_IRQEN);
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#endif
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return;
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bad:
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printk(KERN_ERR "No Timer/irqctrl found\n");
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BUG();
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return;
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}
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void leon_clear_clock_irq(void)
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{
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}
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void leon_load_profile_irq(int cpu, unsigned int limit)
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{
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BUG();
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}
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void __init leon_trans_init(struct device_node *dp)
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{
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if (strcmp(dp->type, "cpu") == 0 && strcmp(dp->name, "<NULL>") == 0) {
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struct property *p;
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p = of_find_property(dp, "mid", (void *)0);
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if (p) {
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int mid;
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dp->name = prom_early_alloc(5 + 1);
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memcpy(&mid, p->value, p->length);
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sprintf((char *)dp->name, "cpu%.2d", mid);
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}
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}
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}
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void __initdata (*prom_amba_init)(struct device_node *dp, struct device_node ***nextp) = 0;
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void __init leon_node_init(struct device_node *dp, struct device_node ***nextp)
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{
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if (prom_amba_init &&
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strcmp(dp->type, "ambapp") == 0 &&
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strcmp(dp->name, "ambapp0") == 0) {
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prom_amba_init(dp, nextp);
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}
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}
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#ifdef CONFIG_SMP
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void leon_set_cpu_int(int cpu, int level)
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{
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unsigned long mask;
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mask = get_irqmask(level);
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LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask);
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}
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static void leon_clear_ipi(int cpu, int level)
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{
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unsigned long mask;
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mask = get_irqmask(level);
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LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask<<16);
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}
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|
|
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static void leon_set_udt(int cpu)
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|
{
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}
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|
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void leon_clear_profile_irq(int cpu)
|
|
{
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|
}
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|
|
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void leon_enable_irq_cpu(unsigned int irq_nr, unsigned int cpu)
|
|
{
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|
unsigned long mask, flags, *addr;
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|
mask = get_irqmask(irq_nr);
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|
spin_lock_irqsave(&leon_irq_lock, flags);
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addr = (unsigned long *)LEON_IMASK(cpu);
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LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) | mask));
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spin_unlock_irqrestore(&leon_irq_lock, flags);
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|
}
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|
|
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#endif
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|
|
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void __init leon_init_IRQ(void)
|
|
{
|
|
sparc_irq_config.init_timers = leon_init_timers;
|
|
sparc_irq_config.build_device_irq = _leon_build_device_irq;
|
|
|
|
BTFIXUPSET_CALL(clear_clock_irq, leon_clear_clock_irq,
|
|
BTFIXUPCALL_NORM);
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|
BTFIXUPSET_CALL(load_profile_irq, leon_load_profile_irq,
|
|
BTFIXUPCALL_NOP);
|
|
|
|
#ifdef CONFIG_SMP
|
|
BTFIXUPSET_CALL(set_cpu_int, leon_set_cpu_int, BTFIXUPCALL_NORM);
|
|
BTFIXUPSET_CALL(clear_cpu_int, leon_clear_ipi, BTFIXUPCALL_NORM);
|
|
BTFIXUPSET_CALL(set_irq_udt, leon_set_udt, BTFIXUPCALL_NORM);
|
|
#endif
|
|
|
|
}
|
|
|
|
void __init leon_init(void)
|
|
{
|
|
of_pdt_build_more = &leon_node_init;
|
|
}
|