374 lines
9.5 KiB
C
374 lines
9.5 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 "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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struct amba_apb_device leon_percpu_timer_dev[16];
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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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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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unsigned int sparc_leon_eirq;
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#define LEON_IMASK ((&leon3_irqctrl_regs->mask[0]))
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/* Return the IRQ of the pending IRQ on the extended IRQ controller */
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int sparc_leon_eirq_get(int eirq, 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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irqreturn_t sparc_leon_eirq_isr(int dummy, void *dev_id)
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{
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printk(KERN_ERR "sparc_leon_eirq_isr: ERROR EXTENDED IRQ\n");
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return IRQ_HANDLED;
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}
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/* The extended IRQ controller has been found, this function registers it */
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void sparc_leon_eirq_register(int eirq)
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{
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int irq;
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/* Register a "BAD" handler for this interrupt, it should never happen */
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irq = request_irq(eirq, sparc_leon_eirq_isr,
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(IRQF_DISABLED | SA_STATIC_ALLOC), "extirq", NULL);
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if (irq) {
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printk(KERN_ERR
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"sparc_leon_eirq_register: unable to attach IRQ%d\n",
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eirq);
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} else {
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sparc_leon_eirq = eirq;
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}
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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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static void leon_enable_irq(unsigned int irq_nr)
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{
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unsigned long mask, flags;
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mask = get_irqmask(irq_nr);
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local_irq_save(flags);
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LEON3_BYPASS_STORE_PA(LEON_IMASK,
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(LEON3_BYPASS_LOAD_PA(LEON_IMASK) | (mask)));
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local_irq_restore(flags);
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}
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static void leon_disable_irq(unsigned int irq_nr)
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{
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unsigned long mask, flags;
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mask = get_irqmask(irq_nr);
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local_irq_save(flags);
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LEON3_BYPASS_STORE_PA(LEON_IMASK,
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(LEON3_BYPASS_LOAD_PA(LEON_IMASK) & ~(mask)));
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local_irq_restore(flags);
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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;
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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 cpu, icsel;
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int ampopts;
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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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LEON3_BYPASS_STORE_PA(
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&leon3_gptimer_regs->e[leon3_gptimer_idx].val, 0);
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LEON3_BYPASS_STORE_PA(
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&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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leon_percpu_timer_dev[0].start = (int)leon3_gptimer_regs;
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leon_percpu_timer_dev[0].irq = leon3_gptimer_irq + 1 +
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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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prom_printf("irq timer not configured with separate irqs\n");
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BUG();
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}
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LEON3_BYPASS_STORE_PA(
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&leon3_gptimer_regs->e[leon3_gptimer_idx+1].val, 0);
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LEON3_BYPASS_STORE_PA(
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&leon3_gptimer_regs->e[leon3_gptimer_idx+1].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+1].ctrl, 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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cpu = sparc_leon3_cpuid();
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icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[cpu/8]);
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icsel = (icsel >> ((7 - (cpu&0x7)) * 4)) & 0xf;
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leon3_irqctrl_regs += icsel;
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} else {
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goto bad;
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}
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irq = request_irq(leon3_gptimer_irq+leon3_gptimer_idx,
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counter_fn,
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(IRQF_DISABLED | SA_STATIC_ALLOC), "timer", NULL);
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if (irq) {
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printk(KERN_ERR "leon_time_init: unable to attach IRQ%d\n",
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LEON_INTERRUPT_TIMER1);
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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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struct tt_entry *trap_table = &sparc_ttable[SP_TRAP_IRQ1 + (leon_percpu_timer_dev[0].irq - 1)];
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/* For SMP we use the level 14 ticker, however the bootup code
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* has copied the firmwares level 14 vector into boot cpu's
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* trap table, we must fix this now or we get squashed.
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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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/* Adjust so that we jump directly to smpleon_ticker */
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trap_table->inst_three += smpleon_ticker - real_irq_entry;
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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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if (leon3_gptimer_regs) {
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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 | LEON3_GPTIMER_IRQEN);
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#ifdef CONFIG_SMP
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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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}
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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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static void leon_set_udt(int cpu)
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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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{
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unsigned long mask, flags, *addr;
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mask = get_irqmask(irq_nr);
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local_irq_save(flags);
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addr = (unsigned long *)&(leon3_irqctrl_regs->mask[cpu]);
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LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) | (mask)));
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local_irq_restore(flags);
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}
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#endif
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void __init leon_init_IRQ(void)
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{
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sparc_init_timers = leon_init_timers;
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BTFIXUPSET_CALL(enable_irq, leon_enable_irq, BTFIXUPCALL_NORM);
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BTFIXUPSET_CALL(disable_irq, leon_disable_irq, BTFIXUPCALL_NORM);
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BTFIXUPSET_CALL(enable_pil_irq, leon_enable_irq, BTFIXUPCALL_NORM);
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BTFIXUPSET_CALL(disable_pil_irq, leon_disable_irq, BTFIXUPCALL_NORM);
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BTFIXUPSET_CALL(clear_clock_irq, leon_clear_clock_irq,
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BTFIXUPCALL_NORM);
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BTFIXUPSET_CALL(load_profile_irq, leon_load_profile_irq,
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BTFIXUPCALL_NOP);
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#ifdef CONFIG_SMP
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BTFIXUPSET_CALL(set_cpu_int, leon_set_cpu_int, BTFIXUPCALL_NORM);
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BTFIXUPSET_CALL(clear_cpu_int, leon_clear_ipi, BTFIXUPCALL_NORM);
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BTFIXUPSET_CALL(set_irq_udt, leon_set_udt, BTFIXUPCALL_NORM);
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#endif
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}
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void __init leon_init(void)
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{
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of_pdt_build_more = &leon_node_init;
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}
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