Merge branch 'wip-2.6.34' into old-private-masterarchived-private-master

5 files changed, 233 insertions, 47 deletions

diff --git a/drivers/clocksource/Makefile b/drivers/clocksource/Makefile
index eef216f7f61d..be61ece6330b 100644
--- a/drivers/clocksource/Makefile
+++ b/drivers/clocksource/Makefile
@@ -2,6 +2,7 @@ obj-$(CONFIG_ATMEL_TCB_CLKSRC)	+= tcb_clksrc.o
 obj-$(CONFIG_X86_CYCLONE_TIMER) += cyclone.o
 obj-$(CONFIG_X86_PM_TIMER)      += acpi_pm.o
 obj-$(CONFIG_SCx200HR_TIMER)    += scx200_hrt.o
+obj-$(CONFIG_CS5535_CLOCK_EVENT_SRC)    += cs5535-clockevt.o
 obj-$(CONFIG_SH_TIMER_CMT)      += sh_cmt.o
 obj-$(CONFIG_SH_TIMER_MTU2)     += sh_mtu2.o
 obj-$(CONFIG_SH_TIMER_TMU)      += sh_tmu.o
diff --git a/drivers/clocksource/cs5535-clockevt.c b/drivers/clocksource/cs5535-clockevt.c
new file mode 100644
index 000000000000..b314a999aabe
--- /dev/null
+++ b/drivers/clocksource/cs5535-clockevt.c
@@ -0,0 +1,197 @@
+/*
+ * Clock event driver for the CS5535/CS5536
+ *
+ * Copyright (C) 2006, Advanced Micro Devices, Inc.
+ * Copyright (C) 2007  Andres Salomon <dilinger@debian.org>
+ * Copyright (C) 2009  Andres Salomon <dilinger@collabora.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of version 2 of the GNU General Public License
+ * as published by the Free Software Foundation.
+ *
+ * The MFGPTs are documented in AMD Geode CS5536 Companion Device Data Book.
+ */
+
+#include <linux/kernel.h>
+#include <linux/irq.h>
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/cs5535.h>
+#include <linux/clockchips.h>
+
+#define DRV_NAME "cs5535-clockevt"
+
+static int timer_irq;
+module_param_named(irq, timer_irq, int, 0644);
+MODULE_PARM_DESC(irq, "Which IRQ to use for the clock source MFGPT ticks.");
+
+/*
+ * We are using the 32.768kHz input clock - it's the only one that has the
+ * ranges we find desirable.  The following table lists the suitable
+ * divisors and the associated Hz, minimum interval and the maximum interval:
+ *
+ *  Divisor   Hz      Min Delta (s)  Max Delta (s)
+ *   1        32768   .00048828125      2.000
+ *   2        16384   .0009765625       4.000
+ *   4         8192   .001953125        8.000
+ *   8         4096   .00390625        16.000
+ *   16        2048   .0078125         32.000
+ *   32        1024   .015625          64.000
+ *   64         512   .03125          128.000
+ *  128         256   .0625           256.000
+ *  256         128   .125            512.000
+ */
+
+static unsigned int cs5535_tick_mode = CLOCK_EVT_MODE_SHUTDOWN;
+static struct cs5535_mfgpt_timer *cs5535_event_clock;
+
+/* Selected from the table above */
+
+#define MFGPT_DIVISOR 16
+#define MFGPT_SCALE  4     /* divisor = 2^(scale) */
+#define MFGPT_HZ  (32768 / MFGPT_DIVISOR)
+#define MFGPT_PERIODIC (MFGPT_HZ / HZ)
+
+/*
+ * The MFPGT timers on the CS5536 provide us with suitable timers to use
+ * as clock event sources - not as good as a HPET or APIC, but certainly
+ * better than the PIT.  This isn't a general purpose MFGPT driver, but
+ * a simplified one designed specifically to act as a clock event source.
+ * For full details about the MFGPT, please consult the CS5536 data sheet.
+ */
+
+static void disable_timer(struct cs5535_mfgpt_timer *timer)
+{
+        /* avoid races by clearing CMP1 and CMP2 unconditionally */
+        cs5535_mfgpt_write(timer, MFGPT_REG_SETUP,
+                        (uint16_t) ~MFGPT_SETUP_CNTEN | MFGPT_SETUP_CMP1 |
+                                MFGPT_SETUP_CMP2);
+}
+
+static void start_timer(struct cs5535_mfgpt_timer *timer, uint16_t delta)
+{
+        cs5535_mfgpt_write(timer, MFGPT_REG_CMP2, delta);
+        cs5535_mfgpt_write(timer, MFGPT_REG_COUNTER, 0);
+
+        cs5535_mfgpt_write(timer, MFGPT_REG_SETUP,
+                        MFGPT_SETUP_CNTEN | MFGPT_SETUP_CMP2);
+}
+
+static void mfgpt_set_mode(enum clock_event_mode mode,
+                struct clock_event_device *evt)
+{
+        disable_timer(cs5535_event_clock);
+
+        if (mode == CLOCK_EVT_MODE_PERIODIC)
+                start_timer(cs5535_event_clock, MFGPT_PERIODIC);
+
+        cs5535_tick_mode = mode;
+}
+
+static int mfgpt_next_event(unsigned long delta, struct clock_event_device *evt)
+{
+        start_timer(cs5535_event_clock, delta);
+        return 0;
+}
+
+static struct clock_event_device cs5535_clockevent = {
+        .name = DRV_NAME,
+        .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
+        .set_mode = mfgpt_set_mode,
+        .set_next_event = mfgpt_next_event,
+        .rating = 250,
+        .cpumask = cpu_all_mask,
+        .shift = 32
+};
+
+static irqreturn_t mfgpt_tick(int irq, void *dev_id)
+{
+        uint16_t val = cs5535_mfgpt_read(cs5535_event_clock, MFGPT_REG_SETUP);
+
+        /* See if the interrupt was for us */
+        if (!(val & (MFGPT_SETUP_SETUP | MFGPT_SETUP_CMP2 | MFGPT_SETUP_CMP1)))
+                return IRQ_NONE;
+
+        /* Turn off the clock (and clear the event) */
+        disable_timer(cs5535_event_clock);
+
+        if (cs5535_tick_mode == CLOCK_EVT_MODE_SHUTDOWN)
+                return IRQ_HANDLED;
+
+        /* Clear the counter */
+        cs5535_mfgpt_write(cs5535_event_clock, MFGPT_REG_COUNTER, 0);
+
+        /* Restart the clock in periodic mode */
+
+        if (cs5535_tick_mode == CLOCK_EVT_MODE_PERIODIC)
+                cs5535_mfgpt_write(cs5535_event_clock, MFGPT_REG_SETUP,
+                                MFGPT_SETUP_CNTEN | MFGPT_SETUP_CMP2);
+
+        cs5535_clockevent.event_handler(&cs5535_clockevent);
+        return IRQ_HANDLED;
+}
+
+static struct irqaction mfgptirq  = {
+        .handler = mfgpt_tick,
+        .flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_TIMER,
+        .name = DRV_NAME,
+};
+
+static int __init cs5535_mfgpt_init(void)
+{
+        struct cs5535_mfgpt_timer *timer;
+        int ret;
+        uint16_t val;
+
+        timer = cs5535_mfgpt_alloc_timer(MFGPT_TIMER_ANY, MFGPT_DOMAIN_WORKING);
+        if (!timer) {
+                printk(KERN_ERR DRV_NAME ": Could not allocate MFPGT timer\n");
+                return -ENODEV;
+        }
+        cs5535_event_clock = timer;
+
+        /* Set up the IRQ on the MFGPT side */
+        if (cs5535_mfgpt_setup_irq(timer, MFGPT_CMP2, &timer_irq)) {
+                printk(KERN_ERR DRV_NAME ": Could not set up IRQ %d\n",
+                                timer_irq);
+                return -EIO;
+        }
+
+        /* And register it with the kernel */
+        ret = setup_irq(timer_irq, &mfgptirq);
+        if (ret) {
+                printk(KERN_ERR DRV_NAME ": Unable to set up the interrupt.\n");
+                goto err;
+        }
+
+        /* Set the clock scale and enable the event mode for CMP2 */
+        val = MFGPT_SCALE | (3 << 8);
+
+        cs5535_mfgpt_write(cs5535_event_clock, MFGPT_REG_SETUP, val);
+
+        /* Set up the clock event */
+        cs5535_clockevent.mult = div_sc(MFGPT_HZ, NSEC_PER_SEC,
+                        cs5535_clockevent.shift);
+        cs5535_clockevent.min_delta_ns = clockevent_delta2ns(0xF,
+                        &cs5535_clockevent);
+        cs5535_clockevent.max_delta_ns = clockevent_delta2ns(0xFFFE,
+                        &cs5535_clockevent);
+
+        printk(KERN_INFO DRV_NAME
+                ": Registering MFGPT timer as a clock event, using IRQ %d\n",
+                timer_irq);
+        clockevents_register_device(&cs5535_clockevent);
+
+        return 0;
+
+err:
+        cs5535_mfgpt_release_irq(cs5535_event_clock, MFGPT_CMP2, &timer_irq);
+        printk(KERN_ERR DRV_NAME ": Unable to set up the MFGPT clock source\n");
+        return -EIO;
+}
+
+module_init(cs5535_mfgpt_init);
+
+MODULE_AUTHOR("Andres Salomon <dilinger@collabora.co.uk>");
+MODULE_DESCRIPTION("CS5535/CS5536 MFGPT clock event driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/clocksource/sh_cmt.c b/drivers/clocksource/sh_cmt.c
index 6b3e0c2f33e2..744f748cc84b 100644
--- a/drivers/clocksource/sh_cmt.c
+++ b/drivers/clocksource/sh_cmt.c
@@ -29,6 +29,7 @@
 #include <linux/clocksource.h>
 #include <linux/clockchips.h>
 #include <linux/sh_timer.h>
+#include <linux/slab.h>
 
 struct sh_cmt_priv {
         void __iomem *mapbase;
@@ -40,7 +41,6 @@ struct sh_cmt_priv {
         struct platform_device *pdev;
 
         unsigned long flags;
-        unsigned long flags_suspend;
         unsigned long match_value;
         unsigned long next_match_value;
         unsigned long max_match_value;
@@ -432,6 +432,11 @@ static void sh_cmt_clocksource_disable(struct clocksource *cs)
         sh_cmt_stop(cs_to_sh_cmt(cs), FLAG_CLOCKSOURCE);
 }
 
+static void sh_cmt_clocksource_resume(struct clocksource *cs)
+{
+        sh_cmt_start(cs_to_sh_cmt(cs), FLAG_CLOCKSOURCE);
+}
+
 static int sh_cmt_register_clocksource(struct sh_cmt_priv *p,
                                        char *name, unsigned long rating)
 {
@@ -442,6 +447,8 @@ static int sh_cmt_register_clocksource(struct sh_cmt_priv *p,
         cs->read = sh_cmt_clocksource_read;
         cs->enable = sh_cmt_clocksource_enable;
         cs->disable = sh_cmt_clocksource_disable;
+        cs->suspend = sh_cmt_clocksource_disable;
+        cs->resume = sh_cmt_clocksource_resume;
         cs->mask = CLOCKSOURCE_MASK(sizeof(unsigned long) * 8);
         cs->flags = CLOCK_SOURCE_IS_CONTINUOUS;
         pr_info("sh_cmt: %s used as clock source\n", cs->name);
@@ -603,18 +610,13 @@ static int sh_cmt_setup(struct sh_cmt_priv *p, struct platform_device *pdev)
         p->irqaction.handler = sh_cmt_interrupt;
         p->irqaction.dev_id = p;
         p->irqaction.flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL;
-        ret = setup_irq(irq, &p->irqaction);
-        if (ret) {
-                pr_err("sh_cmt: failed to request irq %d\n", irq);
-                goto err1;
-        }
 
         /* get hold of clock */
         p->clk = clk_get(&p->pdev->dev, cfg->clk);
         if (IS_ERR(p->clk)) {
                 pr_err("sh_cmt: cannot get clock \"%s\"\n", cfg->clk);
                 ret = PTR_ERR(p->clk);
-                goto err2;
+                goto err1;
         }
 
         if (resource_size(res) == 6) {
@@ -627,14 +629,25 @@ static int sh_cmt_setup(struct sh_cmt_priv *p, struct platform_device *pdev)
                 p->clear_bits = ~0xc000;
         }
 
-        return sh_cmt_register(p, cfg->name,
-                               cfg->clockevent_rating,
-                               cfg->clocksource_rating);
- err2:
-        remove_irq(irq, &p->irqaction);
- err1:
+        ret = sh_cmt_register(p, cfg->name,
+                              cfg->clockevent_rating,
+                              cfg->clocksource_rating);
+        if (ret) {
+                pr_err("sh_cmt: registration failed\n");
+                goto err1;
+        }
+
+        ret = setup_irq(irq, &p->irqaction);
+        if (ret) {
+                pr_err("sh_cmt: failed to request irq %d\n", irq);
+                goto err1;
+        }
+
+        return 0;
+
+err1:
         iounmap(p->mapbase);
- err0:
+err0:
         return ret;
 }
 
@@ -668,38 +681,11 @@ static int __devexit sh_cmt_remove(struct platform_device *pdev)
         return -EBUSY; /* cannot unregister clockevent and clocksource */
 }
 
-static int sh_cmt_suspend(struct device *dev)
-{
-        struct platform_device *pdev = to_platform_device(dev);
-        struct sh_cmt_priv *p = platform_get_drvdata(pdev);
-
-        /* save flag state and stop CMT channel */
-        p->flags_suspend = p->flags;
-        sh_cmt_stop(p, p->flags);
-        return 0;
-}
-
-static int sh_cmt_resume(struct device *dev)
-{
-        struct platform_device *pdev = to_platform_device(dev);
-        struct sh_cmt_priv *p = platform_get_drvdata(pdev);
-
-        /* start CMT channel from saved state */
-        sh_cmt_start(p, p->flags_suspend);
-        return 0;
-}
-
-static struct dev_pm_ops sh_cmt_dev_pm_ops = {
-        .suspend = sh_cmt_suspend,
-        .resume = sh_cmt_resume,
-};
-
 static struct platform_driver sh_cmt_device_driver = {
         .probe          = sh_cmt_probe,
         .remove         = __devexit_p(sh_cmt_remove),
         .driver         = {
                 .name   = "sh_cmt",
-                .pm     = &sh_cmt_dev_pm_ops,
         }
 };
 
diff --git a/drivers/clocksource/sh_mtu2.c b/drivers/clocksource/sh_mtu2.c
index 973e714d6051..5fb78bfd73bb 100644
--- a/drivers/clocksource/sh_mtu2.c
+++ b/drivers/clocksource/sh_mtu2.c
@@ -29,6 +29,7 @@
 #include <linux/err.h>
 #include <linux/clockchips.h>
 #include <linux/sh_timer.h>
+#include <linux/slab.h>
 
 struct sh_mtu2_priv {
         void __iomem *mapbase;
@@ -221,15 +222,15 @@ static void sh_mtu2_register_clockevent(struct sh_mtu2_priv *p,
         ced->cpumask = cpumask_of(0);
         ced->set_mode = sh_mtu2_clock_event_mode;
 
+        pr_info("sh_mtu2: %s used for clock events\n", ced->name);
+        clockevents_register_device(ced);
+
         ret = setup_irq(p->irqaction.irq, &p->irqaction);
         if (ret) {
                 pr_err("sh_mtu2: failed to request irq %d\n",
                        p->irqaction.irq);
                 return;
         }
-
-        pr_info("sh_mtu2: %s used for clock events\n", ced->name);
-        clockevents_register_device(ced);
 }
 
 static int sh_mtu2_register(struct sh_mtu2_priv *p, char *name,
diff --git a/drivers/clocksource/sh_tmu.c b/drivers/clocksource/sh_tmu.c
index 93c2322feab7..fc9ff1e5b770 100644
--- a/drivers/clocksource/sh_tmu.c
+++ b/drivers/clocksource/sh_tmu.c
@@ -30,6 +30,7 @@
 #include <linux/clocksource.h>
 #include <linux/clockchips.h>
 #include <linux/sh_timer.h>
+#include <linux/slab.h>
 
 struct sh_tmu_priv {
         void __iomem *mapbase;
@@ -323,15 +324,15 @@ static void sh_tmu_register_clockevent(struct sh_tmu_priv *p,
         ced->set_next_event = sh_tmu_clock_event_next;
         ced->set_mode = sh_tmu_clock_event_mode;
 
+        pr_info("sh_tmu: %s used for clock events\n", ced->name);
+        clockevents_register_device(ced);
+
         ret = setup_irq(p->irqaction.irq, &p->irqaction);
         if (ret) {
                 pr_err("sh_tmu: failed to request irq %d\n",
                        p->irqaction.irq);
                 return;
         }
-
-        pr_info("sh_tmu: %s used for clock events\n", ced->name);
-        clockevents_register_device(ced);
 }
 
 static int sh_tmu_register(struct sh_tmu_priv *p, char *name,