1 files changed, 69 insertions, 8 deletions

diff --git a/arch/arm/mach-ixp4xx/common.c b/arch/arm/mach-ixp4xx/common.c
index 6d68aed6548a..fc4b7b24265e 100644
--- a/arch/arm/mach-ixp4xx/common.c
+++ b/arch/arm/mach-ixp4xx/common.c
@@ -23,15 +23,14 @@
 #include <linux/interrupt.h>
 #include <linux/bitops.h>
 #include <linux/time.h>
-#include <linux/timex.h>
 #include <linux/clocksource.h>
 #include <linux/clockchips.h>
 #include <linux/io.h>
 #include <linux/export.h>
 #include <linux/gpio.h>
 #include <linux/cpu.h>
+#include <linux/pci.h>
 #include <linux/sched_clock.h>
-
 #include <mach/udc.h>
 #include <mach/hardware.h>
 #include <mach/io.h>
@@ -40,11 +39,21 @@
 #include <asm/page.h>
 #include <asm/irq.h>
 #include <asm/system_misc.h>
-
 #include <asm/mach/map.h>
 #include <asm/mach/irq.h>
 #include <asm/mach/time.h>
 
+#define IXP4XX_TIMER_FREQ 66666000
+
+/*
+ * The timer register doesn't allow to specify the two least significant bits of
+ * the timeout value and assumes them being zero. So make sure IXP4XX_LATCH is
+ * the best value with the two least significant bits unset.
+ */
+#define IXP4XX_LATCH DIV_ROUND_CLOSEST(IXP4XX_TIMER_FREQ, \
+                                       (IXP4XX_OST_RELOAD_MASK + 1) * HZ) * \
+                        (IXP4XX_OST_RELOAD_MASK + 1)
+
 static void __init ixp4xx_clocksource_init(void);
 static void __init ixp4xx_clockevent_init(void);
 static struct clock_event_device clockevent_ixp4xx;
@@ -312,7 +321,7 @@ static irqreturn_t ixp4xx_timer_interrupt(int irq, void *dev_id)
 
 static struct irqaction ixp4xx_timer_irq = {
         .name           = "timer1",
-        .flags          = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
+        .flags          = IRQF_TIMER | IRQF_IRQPOLL,
         .handler        = ixp4xx_timer_interrupt,
         .dev_id         = &clockevent_ixp4xx,
 };
@@ -520,7 +529,7 @@ static void ixp4xx_set_mode(enum clock_event_mode mode,
 
         switch (mode) {
         case CLOCK_EVT_MODE_PERIODIC:
-                osrt = LATCH & ~IXP4XX_OST_RELOAD_MASK;
+                osrt = IXP4XX_LATCH & ~IXP4XX_OST_RELOAD_MASK;
                 opts = IXP4XX_OST_ENABLE;
                 break;
         case CLOCK_EVT_MODE_ONESHOT:
@@ -578,6 +587,54 @@ void ixp4xx_restart(enum reboot_mode mode, const char *cmd)
         }
 }
 
+#ifdef CONFIG_PCI
+static int ixp4xx_needs_bounce(struct device *dev, dma_addr_t dma_addr, size_t size)
+{
+        return (dma_addr + size) > SZ_64M;
+}
+
+static int ixp4xx_platform_notify_remove(struct device *dev)
+{
+        if (dev_is_pci(dev))
+                dmabounce_unregister_dev(dev);
+
+        return 0;
+}
+#endif
+
+/*
+ * Setup DMA mask to 64MB on PCI devices and 4 GB on all other things.
+ */
+static int ixp4xx_platform_notify(struct device *dev)
+{
+        dev->dma_mask = &dev->coherent_dma_mask;
+
+#ifdef CONFIG_PCI
+        if (dev_is_pci(dev)) {
+                dev->coherent_dma_mask = DMA_BIT_MASK(28); /* 64 MB */
+                dmabounce_register_dev(dev, 2048, 4096, ixp4xx_needs_bounce);
+                return 0;
+        }
+#endif
+
+        dev->coherent_dma_mask = DMA_BIT_MASK(32);
+        return 0;
+}
+
+int dma_set_coherent_mask(struct device *dev, u64 mask)
+{
+        if (dev_is_pci(dev))
+                mask &= DMA_BIT_MASK(28); /* 64 MB */
+
+        if ((mask & DMA_BIT_MASK(28)) == DMA_BIT_MASK(28)) {
+                dev->coherent_dma_mask = mask;
+                return 0;
+        }
+
+        return -EIO;            /* device wanted sub-64MB mask */
+}
+EXPORT_SYMBOL(dma_set_coherent_mask);
+
 #ifdef CONFIG_IXP4XX_INDIRECT_PCI
 /*
  * In the case of using indirect PCI, we simply return the actual PCI
@@ -600,12 +657,16 @@ static void ixp4xx_iounmap(void __iomem *addr)
         if (!is_pci_memory((__force u32)addr))
                 __iounmap(addr);
 }
+#endif
 
 void __init ixp4xx_init_early(void)
 {
+        platform_notify = ixp4xx_platform_notify;
+#ifdef CONFIG_PCI
+        platform_notify_remove = ixp4xx_platform_notify_remove;
+#endif
+#ifdef CONFIG_IXP4XX_INDIRECT_PCI
         arch_ioremap_caller = ixp4xx_ioremap_caller;
         arch_iounmap = ixp4xx_iounmap;
-}
-#else
-void __init ixp4xx_init_early(void) {}
 #endif
+}