Merge tag 'metag-v3.9-rc1-v4' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/metag

Pull new ImgTec Meta architecture from James Hogan:
 "This adds core architecture support for Imagination's Meta processor
  cores, followed by some later miscellaneous arch/metag cleanups and
  fixes which I kept separate to ease review:

   - Support for basic Meta 1 (ATP) and Meta 2 (HTP) core architecture
   - A few fixes all over, particularly for symbol prefixes
   - A few privilege protection fixes
   - Several cleanups (setup.c includes, split out a lot of
     metag_ksyms.c)
   - Fix some missing exports
   - Convert hugetlb to use vm_unmapped_area()
   - Copy device tree to non-init memory
   - Provide dma_get_sgtable()"

* tag 'metag-v3.9-rc1-v4' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/metag: (61 commits)
  metag: Provide dma_get_sgtable()
  metag: prom.h: remove declaration of metag_dt_memblock_reserve()
  metag: copy devicetree to non-init memory
  metag: cleanup metag_ksyms.c includes
  metag: move mm/init.c exports out of metag_ksyms.c
  metag: move usercopy.c exports out of metag_ksyms.c
  metag: move setup.c exports out of metag_ksyms.c
  metag: move kick.c exports out of metag_ksyms.c
  metag: move traps.c exports out of metag_ksyms.c
  metag: move irq enable out of irqflags.h on SMP
  genksyms: fix metag symbol prefix on crc symbols
  metag: hugetlb: convert to vm_unmapped_area()
  metag: export clear_page and copy_page
  metag: export metag_code_cache_flush_all
  metag: protect more non-MMU memory regions
  metag: make TXPRIVEXT bits explicit
  metag: kernel/setup.c: sort includes
  perf: Enable building perf tools for Meta
  metag: add boot time LNKGET/LNKSET check
  metag: add __init to metag_cache_probe()
  ...

3 files changed, 204 insertions, 0 deletions

diff --git a/drivers/clocksource/Kconfig b/drivers/clocksource/Kconfig
index e920cbe519fa..e507ab7df60b 100644
--- a/drivers/clocksource/Kconfig
+++ b/drivers/clocksource/Kconfig
@@ -62,3 +62,8 @@ config CLKSRC_DBX500_PRCMU_SCHED_CLOCK
 
 config ARM_ARCH_TIMER
         bool
+
+config CLKSRC_METAG_GENERIC
+        def_bool y if METAG
+        help
+          This option enables support for the Meta per-thread timers.
diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index 7d671b85a98e..4d8283aec5b5 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -21,3 +21,4 @@ obj-$(CONFIG_ARCH_TEGRA)	+= tegra20_timer.o
 obj-$(CONFIG_VT8500_TIMER)      += vt8500_timer.o
 
 obj-$(CONFIG_ARM_ARCH_TIMER)            += arm_arch_timer.o
+obj-$(CONFIG_CLKSRC_METAG_GENERIC)      += metag_generic.o
diff --git a/drivers/clocksource/metag_generic.c b/drivers/clocksource/metag_generic.c
new file mode 100644
index 000000000000..ade7513a11d1
--- /dev/null
+++ b/drivers/clocksource/metag_generic.c
@@ -0,0 +1,198 @@
+/*
+ * Copyright (C) 2005-2013 Imagination Technologies Ltd.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ * Support for Meta per-thread timers.
+ *
+ * Meta hardware threads have 2 timers. The background timer (TXTIMER) is used
+ * as a free-running time base (hz clocksource), and the interrupt timer
+ * (TXTIMERI) is used for the timer interrupt (clock event). Both counters
+ * traditionally count at approximately 1MHz.
+ */
+
+#include <clocksource/metag_generic.h>
+#include <linux/cpu.h>
+#include <linux/errno.h>
+#include <linux/sched.h>
+#include <linux/kernel.h>
+#include <linux/param.h>
+#include <linux/time.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/clocksource.h>
+#include <linux/clockchips.h>
+#include <linux/interrupt.h>
+
+#include <asm/clock.h>
+#include <asm/hwthread.h>
+#include <asm/core_reg.h>
+#include <asm/metag_mem.h>
+#include <asm/tbx.h>
+
+#define HARDWARE_FREQ           1000000 /* 1MHz */
+#define HARDWARE_DIV            1       /* divide by 1 = 1MHz clock */
+#define HARDWARE_TO_NS_SHIFT    10      /* convert ticks to ns */
+
+static unsigned int hwtimer_freq = HARDWARE_FREQ;
+static DEFINE_PER_CPU(struct clock_event_device, local_clockevent);
+static DEFINE_PER_CPU(char [11], local_clockevent_name);
+
+static int metag_timer_set_next_event(unsigned long delta,
+                                      struct clock_event_device *dev)
+{
+        __core_reg_set(TXTIMERI, -delta);
+        return 0;
+}
+
+static void metag_timer_set_mode(enum clock_event_mode mode,
+                                 struct clock_event_device *evt)
+{
+        switch (mode) {
+        case CLOCK_EVT_MODE_ONESHOT:
+        case CLOCK_EVT_MODE_RESUME:
+                break;
+
+        case CLOCK_EVT_MODE_SHUTDOWN:
+                /* We should disable the IRQ here */
+                break;
+
+        case CLOCK_EVT_MODE_PERIODIC:
+        case CLOCK_EVT_MODE_UNUSED:
+                WARN_ON(1);
+                break;
+        };
+}
+
+static cycle_t metag_clocksource_read(struct clocksource *cs)
+{
+        return __core_reg_get(TXTIMER);
+}
+
+static struct clocksource clocksource_metag = {
+        .name = "META",
+        .rating = 200,
+        .mask = CLOCKSOURCE_MASK(32),
+        .read = metag_clocksource_read,
+        .flags = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+
+static irqreturn_t metag_timer_interrupt(int irq, void *dummy)
+{
+        struct clock_event_device *evt = &__get_cpu_var(local_clockevent);
+
+        evt->event_handler(evt);
+
+        return IRQ_HANDLED;
+}
+
+static struct irqaction metag_timer_irq = {
+        .name = "META core timer",
+        .handler = metag_timer_interrupt,
+        .flags = IRQF_TIMER | IRQF_IRQPOLL | IRQF_PERCPU,
+};
+
+unsigned long long sched_clock(void)
+{
+        unsigned long long ticks = __core_reg_get(TXTIMER);
+        return ticks << HARDWARE_TO_NS_SHIFT;
+}
+
+static void __cpuinit arch_timer_setup(unsigned int cpu)
+{
+        unsigned int txdivtime;
+        struct clock_event_device *clk = &per_cpu(local_clockevent, cpu);
+        char *name = per_cpu(local_clockevent_name, cpu);
+
+        txdivtime = __core_reg_get(TXDIVTIME);
+
+        txdivtime &= ~TXDIVTIME_DIV_BITS;
+        txdivtime |= (HARDWARE_DIV & TXDIVTIME_DIV_BITS);
+
+        __core_reg_set(TXDIVTIME, txdivtime);
+
+        sprintf(name, "META %d", cpu);
+        clk->name = name;
+        clk->features = CLOCK_EVT_FEAT_ONESHOT,
+
+        clk->rating = 200,
+        clk->shift = 12,
+        clk->irq = tbisig_map(TBID_SIGNUM_TRT),
+        clk->set_mode = metag_timer_set_mode,
+        clk->set_next_event = metag_timer_set_next_event,
+
+        clk->mult = div_sc(hwtimer_freq, NSEC_PER_SEC, clk->shift);
+        clk->max_delta_ns = clockevent_delta2ns(0x7fffffff, clk);
+        clk->min_delta_ns = clockevent_delta2ns(0xf, clk);
+        clk->cpumask = cpumask_of(cpu);
+
+        clockevents_register_device(clk);
+
+        /*
+         * For all non-boot CPUs we need to synchronize our free
+         * running clock (TXTIMER) with the boot CPU's clock.
+         *
+         * While this won't be accurate, it should be close enough.
+         */
+        if (cpu) {
+                unsigned int thread0 = cpu_2_hwthread_id[0];
+                unsigned long val;
+
+                val = core_reg_read(TXUCT_ID, TXTIMER_REGNUM, thread0);
+                __core_reg_set(TXTIMER, val);
+        }
+}
+
+static int __cpuinit arch_timer_cpu_notify(struct notifier_block *self,
+                                           unsigned long action, void *hcpu)
+{
+        int cpu = (long)hcpu;
+
+        switch (action) {
+        case CPU_STARTING:
+        case CPU_STARTING_FROZEN:
+                arch_timer_setup(cpu);
+                break;
+        }
+
+        return NOTIFY_OK;
+}
+
+static struct notifier_block __cpuinitdata arch_timer_cpu_nb = {
+        .notifier_call = arch_timer_cpu_notify,
+};
+
+int __init metag_generic_timer_init(void)
+{
+        /*
+         * On Meta 2 SoCs, the actual frequency of the timer is based on the
+         * Meta core clock speed divided by an integer, so it is only
+         * approximately 1MHz. Calculating the real frequency here drastically
+         * reduces clock skew on these SoCs.
+         */
+#ifdef CONFIG_METAG_META21
+        hwtimer_freq = get_coreclock() / (metag_in32(EXPAND_TIMER_DIV) + 1);
+#endif
+        clocksource_register_hz(&clocksource_metag, hwtimer_freq);
+
+        setup_irq(tbisig_map(TBID_SIGNUM_TRT), &metag_timer_irq);
+
+        /* Configure timer on boot CPU */
+        arch_timer_setup(smp_processor_id());
+
+        /* Hook cpu boot to configure other CPU's timers */
+        register_cpu_notifier(&arch_timer_cpu_nb);
+
+        return 0;
+}