summaryrefslogtreecommitdiffstats
path: root/arch/sparc/kernel/leon_kernel.c
diff options
context:
space:
mode:
authorAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
committerAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
commitb4b6116a13633898cf868f2f103c96a90c4c20f8 (patch)
tree93d1b7e2cfcdf473d8d4ff3ad141fa864f8491f6 /arch/sparc/kernel/leon_kernel.c
parentedd4be777c953e5faafc80d091d3084b4343f5d3 (diff)
downloadkernel-uprobes-b4b6116a13633898cf868f2f103c96a90c4c20f8.tar.gz
kernel-uprobes-b4b6116a13633898cf868f2f103c96a90c4c20f8.tar.xz
kernel-uprobes-b4b6116a13633898cf868f2f103c96a90c4c20f8.zip
fedora kernel: d9aad82f3319f3cfd1aebc01234254ef0c37ad84v3.3.2-1
Signed-off-by: Anton Arapov <anton@redhat.com>
Diffstat (limited to 'arch/sparc/kernel/leon_kernel.c')
-rw-r--r--arch/sparc/kernel/leon_kernel.c516
1 files changed, 516 insertions, 0 deletions
diff --git a/arch/sparc/kernel/leon_kernel.c b/arch/sparc/kernel/leon_kernel.c
new file mode 100644
index 00000000000..a19c8a06368
--- /dev/null
+++ b/arch/sparc/kernel/leon_kernel.c
@@ -0,0 +1,516 @@
+/*
+ * Copyright (C) 2009 Daniel Hellstrom (daniel@gaisler.com) Aeroflex Gaisler AB
+ * Copyright (C) 2009 Konrad Eisele (konrad@gaisler.com) Aeroflex Gaisler AB
+ */
+
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/interrupt.h>
+#include <linux/of_device.h>
+
+#include <asm/oplib.h>
+#include <asm/timer.h>
+#include <asm/prom.h>
+#include <asm/leon.h>
+#include <asm/leon_amba.h>
+#include <asm/traps.h>
+#include <asm/cacheflush.h>
+#include <asm/smp.h>
+#include <asm/setup.h>
+
+#include "prom.h"
+#include "irq.h"
+
+struct leon3_irqctrl_regs_map *leon3_irqctrl_regs; /* interrupt controller base address */
+struct leon3_gptimer_regs_map *leon3_gptimer_regs; /* timer controller base address */
+
+int leondebug_irq_disable;
+int leon_debug_irqout;
+static int dummy_master_l10_counter;
+unsigned long amba_system_id;
+static DEFINE_SPINLOCK(leon_irq_lock);
+
+unsigned long leon3_gptimer_irq; /* interrupt controller irq number */
+unsigned long leon3_gptimer_idx; /* Timer Index (0..6) within Timer Core */
+int leon3_ticker_irq; /* Timer ticker IRQ */
+unsigned int sparc_leon_eirq;
+#define LEON_IMASK(cpu) (&leon3_irqctrl_regs->mask[cpu])
+#define LEON_IACK (&leon3_irqctrl_regs->iclear)
+#define LEON_DO_ACK_HW 1
+
+/* Return the last ACKed IRQ by the Extended IRQ controller. It has already
+ * been (automatically) ACKed when the CPU takes the trap.
+ */
+static inline unsigned int leon_eirq_get(int cpu)
+{
+ return LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->intid[cpu]) & 0x1f;
+}
+
+/* Handle one or multiple IRQs from the extended interrupt controller */
+static void leon_handle_ext_irq(unsigned int irq, struct irq_desc *desc)
+{
+ unsigned int eirq;
+ int cpu = sparc_leon3_cpuid();
+
+ eirq = leon_eirq_get(cpu);
+ if ((eirq & 0x10) && irq_map[eirq]->irq) /* bit4 tells if IRQ happened */
+ generic_handle_irq(irq_map[eirq]->irq);
+}
+
+/* The extended IRQ controller has been found, this function registers it */
+void leon_eirq_setup(unsigned int eirq)
+{
+ unsigned long mask, oldmask;
+ unsigned int veirq;
+
+ if (eirq < 1 || eirq > 0xf) {
+ printk(KERN_ERR "LEON EXT IRQ NUMBER BAD: %d\n", eirq);
+ return;
+ }
+
+ veirq = leon_build_device_irq(eirq, leon_handle_ext_irq, "extirq", 0);
+
+ /*
+ * Unmask the Extended IRQ, the IRQs routed through the Ext-IRQ
+ * controller have a mask-bit of their own, so this is safe.
+ */
+ irq_link(veirq);
+ mask = 1 << eirq;
+ oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(boot_cpu_id));
+ LEON3_BYPASS_STORE_PA(LEON_IMASK(boot_cpu_id), (oldmask | mask));
+ sparc_leon_eirq = eirq;
+}
+
+static inline unsigned long get_irqmask(unsigned int irq)
+{
+ unsigned long mask;
+
+ if (!irq || ((irq > 0xf) && !sparc_leon_eirq)
+ || ((irq > 0x1f) && sparc_leon_eirq)) {
+ printk(KERN_ERR
+ "leon_get_irqmask: false irq number: %d\n", irq);
+ mask = 0;
+ } else {
+ mask = LEON_HARD_INT(irq);
+ }
+ return mask;
+}
+
+#ifdef CONFIG_SMP
+static int irq_choose_cpu(const struct cpumask *affinity)
+{
+ cpumask_t mask;
+
+ cpus_and(mask, cpu_online_map, *affinity);
+ if (cpus_equal(mask, cpu_online_map) || cpus_empty(mask))
+ return boot_cpu_id;
+ else
+ return first_cpu(mask);
+}
+#else
+#define irq_choose_cpu(affinity) boot_cpu_id
+#endif
+
+static int leon_set_affinity(struct irq_data *data, const struct cpumask *dest,
+ bool force)
+{
+ unsigned long mask, oldmask, flags;
+ int oldcpu, newcpu;
+
+ mask = (unsigned long)data->chip_data;
+ oldcpu = irq_choose_cpu(data->affinity);
+ newcpu = irq_choose_cpu(dest);
+
+ if (oldcpu == newcpu)
+ goto out;
+
+ /* unmask on old CPU first before enabling on the selected CPU */
+ spin_lock_irqsave(&leon_irq_lock, flags);
+ oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(oldcpu));
+ LEON3_BYPASS_STORE_PA(LEON_IMASK(oldcpu), (oldmask & ~mask));
+ oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(newcpu));
+ LEON3_BYPASS_STORE_PA(LEON_IMASK(newcpu), (oldmask | mask));
+ spin_unlock_irqrestore(&leon_irq_lock, flags);
+out:
+ return IRQ_SET_MASK_OK;
+}
+
+static void leon_unmask_irq(struct irq_data *data)
+{
+ unsigned long mask, oldmask, flags;
+ int cpu;
+
+ mask = (unsigned long)data->chip_data;
+ cpu = irq_choose_cpu(data->affinity);
+ spin_lock_irqsave(&leon_irq_lock, flags);
+ oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(cpu));
+ LEON3_BYPASS_STORE_PA(LEON_IMASK(cpu), (oldmask | mask));
+ spin_unlock_irqrestore(&leon_irq_lock, flags);
+}
+
+static void leon_mask_irq(struct irq_data *data)
+{
+ unsigned long mask, oldmask, flags;
+ int cpu;
+
+ mask = (unsigned long)data->chip_data;
+ cpu = irq_choose_cpu(data->affinity);
+ spin_lock_irqsave(&leon_irq_lock, flags);
+ oldmask = LEON3_BYPASS_LOAD_PA(LEON_IMASK(cpu));
+ LEON3_BYPASS_STORE_PA(LEON_IMASK(cpu), (oldmask & ~mask));
+ spin_unlock_irqrestore(&leon_irq_lock, flags);
+}
+
+static unsigned int leon_startup_irq(struct irq_data *data)
+{
+ irq_link(data->irq);
+ leon_unmask_irq(data);
+ return 0;
+}
+
+static void leon_shutdown_irq(struct irq_data *data)
+{
+ leon_mask_irq(data);
+ irq_unlink(data->irq);
+}
+
+/* Used by external level sensitive IRQ handlers on the LEON: ACK IRQ ctrl */
+static void leon_eoi_irq(struct irq_data *data)
+{
+ unsigned long mask = (unsigned long)data->chip_data;
+
+ if (mask & LEON_DO_ACK_HW)
+ LEON3_BYPASS_STORE_PA(LEON_IACK, mask & ~LEON_DO_ACK_HW);
+}
+
+static struct irq_chip leon_irq = {
+ .name = "leon",
+ .irq_startup = leon_startup_irq,
+ .irq_shutdown = leon_shutdown_irq,
+ .irq_mask = leon_mask_irq,
+ .irq_unmask = leon_unmask_irq,
+ .irq_eoi = leon_eoi_irq,
+ .irq_set_affinity = leon_set_affinity,
+};
+
+/*
+ * Build a LEON IRQ for the edge triggered LEON IRQ controller:
+ * Edge (normal) IRQ - handle_simple_irq, ack=DONT-CARE, never ack
+ * Level IRQ (PCI|Level-GPIO) - handle_fasteoi_irq, ack=1, ack after ISR
+ * Per-CPU Edge - handle_percpu_irq, ack=0
+ */
+unsigned int leon_build_device_irq(unsigned int real_irq,
+ irq_flow_handler_t flow_handler,
+ const char *name, int do_ack)
+{
+ unsigned int irq;
+ unsigned long mask;
+
+ irq = 0;
+ mask = get_irqmask(real_irq);
+ if (mask == 0)
+ goto out;
+
+ irq = irq_alloc(real_irq, real_irq);
+ if (irq == 0)
+ goto out;
+
+ if (do_ack)
+ mask |= LEON_DO_ACK_HW;
+
+ irq_set_chip_and_handler_name(irq, &leon_irq,
+ flow_handler, name);
+ irq_set_chip_data(irq, (void *)mask);
+
+out:
+ return irq;
+}
+
+static unsigned int _leon_build_device_irq(struct platform_device *op,
+ unsigned int real_irq)
+{
+ return leon_build_device_irq(real_irq, handle_simple_irq, "edge", 0);
+}
+
+void leon_update_virq_handling(unsigned int virq,
+ irq_flow_handler_t flow_handler,
+ const char *name, int do_ack)
+{
+ unsigned long mask = (unsigned long)irq_get_chip_data(virq);
+
+ mask &= ~LEON_DO_ACK_HW;
+ if (do_ack)
+ mask |= LEON_DO_ACK_HW;
+
+ irq_set_chip_and_handler_name(virq, &leon_irq,
+ flow_handler, name);
+ irq_set_chip_data(virq, (void *)mask);
+}
+
+void __init leon_init_timers(irq_handler_t counter_fn)
+{
+ int irq, eirq;
+ struct device_node *rootnp, *np, *nnp;
+ struct property *pp;
+ int len;
+ int icsel;
+ int ampopts;
+ int err;
+
+ leondebug_irq_disable = 0;
+ leon_debug_irqout = 0;
+ master_l10_counter = (unsigned int *)&dummy_master_l10_counter;
+ dummy_master_l10_counter = 0;
+
+ rootnp = of_find_node_by_path("/ambapp0");
+ if (!rootnp)
+ goto bad;
+
+ /* Find System ID: GRLIB build ID and optional CHIP ID */
+ pp = of_find_property(rootnp, "systemid", &len);
+ if (pp)
+ amba_system_id = *(unsigned long *)pp->value;
+
+ /* Find IRQMP IRQ Controller Registers base adr otherwise bail out */
+ np = of_find_node_by_name(rootnp, "GAISLER_IRQMP");
+ if (!np) {
+ np = of_find_node_by_name(rootnp, "01_00d");
+ if (!np)
+ goto bad;
+ }
+ pp = of_find_property(np, "reg", &len);
+ if (!pp)
+ goto bad;
+ leon3_irqctrl_regs = *(struct leon3_irqctrl_regs_map **)pp->value;
+
+ /* Find GPTIMER Timer Registers base address otherwise bail out. */
+ nnp = rootnp;
+ do {
+ np = of_find_node_by_name(nnp, "GAISLER_GPTIMER");
+ if (!np) {
+ np = of_find_node_by_name(nnp, "01_011");
+ if (!np)
+ goto bad;
+ }
+
+ ampopts = 0;
+ pp = of_find_property(np, "ampopts", &len);
+ if (pp) {
+ ampopts = *(int *)pp->value;
+ if (ampopts == 0) {
+ /* Skip this instance, resource already
+ * allocated by other OS */
+ nnp = np;
+ continue;
+ }
+ }
+
+ /* Select Timer-Instance on Timer Core. Default is zero */
+ leon3_gptimer_idx = ampopts & 0x7;
+
+ pp = of_find_property(np, "reg", &len);
+ if (pp)
+ leon3_gptimer_regs = *(struct leon3_gptimer_regs_map **)
+ pp->value;
+ pp = of_find_property(np, "interrupts", &len);
+ if (pp)
+ leon3_gptimer_irq = *(unsigned int *)pp->value;
+ } while (0);
+
+ if (!(leon3_gptimer_regs && leon3_irqctrl_regs && leon3_gptimer_irq))
+ goto bad;
+
+ LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].val, 0);
+ LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].rld,
+ (((1000000 / HZ) - 1)));
+ LEON3_BYPASS_STORE_PA(
+ &leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl, 0);
+
+#ifdef CONFIG_SMP
+ leon3_ticker_irq = leon3_gptimer_irq + 1 + leon3_gptimer_idx;
+
+ if (!(LEON3_BYPASS_LOAD_PA(&leon3_gptimer_regs->config) &
+ (1<<LEON3_GPTIMER_SEPIRQ))) {
+ printk(KERN_ERR "timer not configured with separate irqs\n");
+ BUG();
+ }
+
+ LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].val,
+ 0);
+ LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].rld,
+ (((1000000/HZ) - 1)));
+ LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
+ 0);
+#endif
+
+ /*
+ * The IRQ controller may (if implemented) consist of multiple
+ * IRQ controllers, each mapped on a 4Kb boundary.
+ * Each CPU may be routed to different IRQCTRLs, however
+ * we assume that all CPUs (in SMP system) is routed to the
+ * same IRQ Controller, and for non-SMP only one IRQCTRL is
+ * accessed anyway.
+ * In AMP systems, Linux must run on CPU0 for the time being.
+ */
+ icsel = LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->icsel[boot_cpu_id/8]);
+ icsel = (icsel >> ((7 - (boot_cpu_id&0x7)) * 4)) & 0xf;
+ leon3_irqctrl_regs += icsel;
+
+ /* Mask all IRQs on boot-cpu IRQ controller */
+ LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->mask[boot_cpu_id], 0);
+
+ /* Probe extended IRQ controller */
+ eirq = (LEON3_BYPASS_LOAD_PA(&leon3_irqctrl_regs->mpstatus)
+ >> 16) & 0xf;
+ if (eirq != 0)
+ leon_eirq_setup(eirq);
+
+ irq = _leon_build_device_irq(NULL, leon3_gptimer_irq+leon3_gptimer_idx);
+ err = request_irq(irq, counter_fn, IRQF_TIMER, "timer", NULL);
+ if (err) {
+ printk(KERN_ERR "unable to attach timer IRQ%d\n", irq);
+ prom_halt();
+ }
+
+#ifdef CONFIG_SMP
+ {
+ unsigned long flags;
+
+ /*
+ * In SMP, sun4m adds a IPI handler to IRQ trap handler that
+ * LEON never must take, sun4d and LEON overwrites the branch
+ * with a NOP.
+ */
+ local_irq_save(flags);
+ patchme_maybe_smp_msg[0] = 0x01000000; /* NOP out the branch */
+ local_flush_cache_all();
+ local_irq_restore(flags);
+ }
+#endif
+
+ LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx].ctrl,
+ LEON3_GPTIMER_EN |
+ LEON3_GPTIMER_RL |
+ LEON3_GPTIMER_LD |
+ LEON3_GPTIMER_IRQEN);
+
+#ifdef CONFIG_SMP
+ /* Install per-cpu IRQ handler for broadcasted ticker */
+ irq = leon_build_device_irq(leon3_ticker_irq, handle_percpu_irq,
+ "per-cpu", 0);
+ err = request_irq(irq, leon_percpu_timer_interrupt,
+ IRQF_PERCPU | IRQF_TIMER, "ticker",
+ NULL);
+ if (err) {
+ printk(KERN_ERR "unable to attach ticker IRQ%d\n", irq);
+ prom_halt();
+ }
+
+ LEON3_BYPASS_STORE_PA(&leon3_gptimer_regs->e[leon3_gptimer_idx+1].ctrl,
+ LEON3_GPTIMER_EN |
+ LEON3_GPTIMER_RL |
+ LEON3_GPTIMER_LD |
+ LEON3_GPTIMER_IRQEN);
+#endif
+ return;
+bad:
+ printk(KERN_ERR "No Timer/irqctrl found\n");
+ BUG();
+ return;
+}
+
+void leon_clear_clock_irq(void)
+{
+}
+
+void leon_load_profile_irq(int cpu, unsigned int limit)
+{
+ BUG();
+}
+
+void __init leon_trans_init(struct device_node *dp)
+{
+ if (strcmp(dp->type, "cpu") == 0 && strcmp(dp->name, "<NULL>") == 0) {
+ struct property *p;
+ p = of_find_property(dp, "mid", (void *)0);
+ if (p) {
+ int mid;
+ dp->name = prom_early_alloc(5 + 1);
+ memcpy(&mid, p->value, p->length);
+ sprintf((char *)dp->name, "cpu%.2d", mid);
+ }
+ }
+}
+
+void __initdata (*prom_amba_init)(struct device_node *dp, struct device_node ***nextp) = 0;
+
+void __init leon_node_init(struct device_node *dp, struct device_node ***nextp)
+{
+ if (prom_amba_init &&
+ strcmp(dp->type, "ambapp") == 0 &&
+ strcmp(dp->name, "ambapp0") == 0) {
+ prom_amba_init(dp, nextp);
+ }
+}
+
+#ifdef CONFIG_SMP
+
+void leon_set_cpu_int(int cpu, int level)
+{
+ unsigned long mask;
+ mask = get_irqmask(level);
+ LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask);
+}
+
+static void leon_clear_ipi(int cpu, int level)
+{
+ unsigned long mask;
+ mask = get_irqmask(level);
+ LEON3_BYPASS_STORE_PA(&leon3_irqctrl_regs->force[cpu], mask<<16);
+}
+
+static void leon_set_udt(int cpu)
+{
+}
+
+void leon_clear_profile_irq(int cpu)
+{
+}
+
+void leon_enable_irq_cpu(unsigned int irq_nr, unsigned int cpu)
+{
+ unsigned long mask, flags, *addr;
+ mask = get_irqmask(irq_nr);
+ spin_lock_irqsave(&leon_irq_lock, flags);
+ addr = (unsigned long *)LEON_IMASK(cpu);
+ LEON3_BYPASS_STORE_PA(addr, (LEON3_BYPASS_LOAD_PA(addr) | mask));
+ spin_unlock_irqrestore(&leon_irq_lock, flags);
+}
+
+#endif
+
+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);
+ 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;
+}