[MIPS] Sibyte: Split and move clock code.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 148 insertions, 0 deletions

diff --git a/arch/mips/kernel/cevt-sb1250.c b/arch/mips/kernel/cevt-sb1250.c
new file mode 100644
index 000000000000..e2029d0fc39b
--- /dev/null
+++ b/arch/mips/kernel/cevt-sb1250.c
@@ -0,0 +1,148 @@
+/*
+ * Copyright (C) 2000, 2001 Broadcom Corporation
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+ */
+#include <linux/clockchips.h>
+#include <linux/interrupt.h>
+#include <linux/percpu.h>
+
+#include <asm/addrspace.h>
+#include <asm/io.h>
+#include <asm/time.h>
+
+#include <asm/sibyte/sb1250.h>
+#include <asm/sibyte/sb1250_regs.h>
+#include <asm/sibyte/sb1250_int.h>
+#include <asm/sibyte/sb1250_scd.h>
+
+#define IMR_IP2_VAL     K_INT_MAP_I0
+#define IMR_IP3_VAL     K_INT_MAP_I1
+#define IMR_IP4_VAL     K_INT_MAP_I2
+
+/*
+ * The general purpose timer ticks at 1MHz independent if
+ * the rest of the system
+ */
+static void sibyte_set_mode(enum clock_event_mode mode,
+                           struct clock_event_device *evt)
+{
+        unsigned int cpu = smp_processor_id();
+        void __iomem *cfg, *init;
+
+        cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
+        init = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_INIT));
+
+        switch (mode) {
+        case CLOCK_EVT_MODE_PERIODIC:
+                __raw_writeq(0, cfg);
+                __raw_writeq((V_SCD_TIMER_FREQ / HZ) - 1, init);
+                __raw_writeq(M_SCD_TIMER_ENABLE | M_SCD_TIMER_MODE_CONTINUOUS,
+                             cfg);
+                break;
+
+        case CLOCK_EVT_MODE_ONESHOT:
+                /* Stop the timer until we actually program a shot */
+        case CLOCK_EVT_MODE_SHUTDOWN:
+                __raw_writeq(0, cfg);
+                break;
+
+        case CLOCK_EVT_MODE_UNUSED:     /* shuddup gcc */
+        case CLOCK_EVT_MODE_RESUME:
+                ;
+        }
+}
+
+static int sibyte_next_event(unsigned long delta, struct clock_event_device *cd)
+{
+        unsigned int cpu = smp_processor_id();
+        void __iomem *cfg, *init;
+
+        cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
+        init = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_INIT));
+
+        __raw_writeq(delta - 1, init);
+        __raw_writeq(M_SCD_TIMER_ENABLE, cfg);
+
+        return 0;
+}
+
+static irqreturn_t sibyte_counter_handler(int irq, void *dev_id)
+{
+        unsigned int cpu = smp_processor_id();
+        struct clock_event_device *cd = dev_id;
+        void __iomem *cfg;
+        unsigned long tmode;
+
+        if (cd->mode == CLOCK_EVT_MODE_PERIODIC)
+                tmode = M_SCD_TIMER_ENABLE | M_SCD_TIMER_MODE_CONTINUOUS;
+        else
+                tmode = 0;
+
+        /* ACK interrupt */
+        cfg = IOADDR(A_SCD_TIMER_REGISTER(cpu, R_SCD_TIMER_CFG));
+        ____raw_writeq(tmode, cfg);
+
+        cd->event_handler(cd);
+
+        return IRQ_HANDLED;
+}
+
+static DEFINE_PER_CPU(struct clock_event_device, sibyte_hpt_clockevent);
+static DEFINE_PER_CPU(struct irqaction, sibyte_hpt_irqaction);
+static DEFINE_PER_CPU(char [18], sibyte_hpt_name);
+
+void __cpuinit sb1250_clockevent_init(void)
+{
+        unsigned int cpu = smp_processor_id();
+        unsigned int irq = K_INT_TIMER_0 + cpu;
+        struct irqaction *action = &per_cpu(sibyte_hpt_irqaction, cpu);
+        struct clock_event_device *cd = &per_cpu(sibyte_hpt_clockevent, cpu);
+        unsigned char *name = per_cpu(sibyte_hpt_name, cpu);
+
+        /* Only have 4 general purpose timers, and we use last one as hpt */
+        BUG_ON(cpu > 2);
+
+        sprintf(name, "sb1250-counter-%d", cpu);
+        cd->name                = name;
+        cd->features            = CLOCK_EVT_FEAT_PERIODIC |
+                                  CLOCK_EVT_FEAT_ONESHOT;
+        clockevent_set_clock(cd, V_SCD_TIMER_FREQ);
+        cd->max_delta_ns        = clockevent_delta2ns(0x7fffff, cd);
+        cd->min_delta_ns        = clockevent_delta2ns(1, cd);
+        cd->rating              = 200;
+        cd->irq                 = irq;
+        cd->cpumask             = cpumask_of_cpu(cpu);
+        cd->set_next_event      = sibyte_next_event;
+        cd->set_mode            = sibyte_set_mode;
+        clockevents_register_device(cd);
+
+        sb1250_mask_irq(cpu, irq);
+
+        /*
+         * Map the timer interrupt to IP[4] of this cpu
+         */
+        __raw_writeq(IMR_IP4_VAL,
+                     IOADDR(A_IMR_REGISTER(cpu, R_IMR_INTERRUPT_MAP_BASE) +
+                            (irq << 3)));
+
+        sb1250_unmask_irq(cpu, irq);
+
+        action->handler = sibyte_counter_handler;
+        action->flags   = IRQF_DISABLED | IRQF_PERCPU;
+        action->name    = name;
+        action->dev_id  = cd;
+        setup_irq(irq, action);
+}