Merge tag 'arm-soc/for-4.8/soc-arm64-part2' of http://github.com/Broadcom/stblinux into next/arm64

Merge "Broadcom ARM64-based SoC changes for 4.8 second part" from Florian Fainelli:

- Eric updates the bcm2836 interrupt controller driver not to rely on ARM/Linux specific functions
  in preparation for using it on ARM64

- Eric also adds a Kconfig entry for the BCM2835 Raspberry Pi family in the ARM64 Kconfig.platforms
  file

- Eric cherry picked a patch from Alexander Graf with Acks from ARM64 maintainers to support different
  DMA and bus offsets, required for the Raspberry Pi 3 SoC

* tag 'arm-soc/for-4.8/soc-arm64-part2' of http://github.com/Broadcom/stblinux:
  arm64: Add platform selection for BCM2835.
  arm64: Allow for different DMA and CPU bus offsets
  irqchip: bcm2835: Avoid arch/arm-specific handle_IRQ

arch/arm64/Kconfig.platforms

@@ -13,6 +13,19 @@ config ARCH_ALPINE
 	  This enables support for the Annapurna Labs Alpine
 	  Soc family.
 
+config ARCH_BCM2835
+	bool "Broadcom BCM2835 family"
+	select ARCH_REQUIRE_GPIOLIB
+	select CLKSRC_OF
+	select PINCTRL
+	select PINCTRL_BCM2835
+	select ARM_AMBA
+	select ARM_TIMER_SP804
+	select HAVE_ARM_ARCH_TIMER
+	help
+	  This enables support for the Broadcom BCM2837 SoC.
+	  This SoC is used in the Raspberry Pi 3 device.
+
 config ARCH_BCM_IPROC
 	bool "Broadcom iProc SoC Family"
 	select COMMON_CLK_IPROC

arch/arm64/include/asm/dma-mapping.h

@@ -66,12 +66,16 @@ static inline bool is_device_dma_coherent(struct device *dev)
 
 static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
 {
-	return (dma_addr_t)paddr;
+	dma_addr_t dev_addr = (dma_addr_t)paddr;
+
+	return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
 }
 
 static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr)
 {
-	return (phys_addr_t)dev_addr;
+	phys_addr_t paddr = (phys_addr_t)dev_addr;
+
+	return paddr + ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT);
 }
 
 static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size)
@@ -86,5 +90,14 @@ static inline void dma_mark_clean(void *addr, size_t size)
 {
 }
 
+/* Override for dma_max_pfn() */
+static inline unsigned long dma_max_pfn(struct device *dev)
+{
+	dma_addr_t dma_max = (dma_addr_t)*dev->dma_mask;
+
+	return (ulong)dma_to_phys(dev, dma_max) >> PAGE_SHIFT;
+}
+#define dma_max_pfn(dev) dma_max_pfn(dev)
+
 #endif	/* __KERNEL__ */
 #endif	/* __ASM_DMA_MAPPING_H */

drivers/irqchip/irq-bcm2835.c

@@ -52,7 +52,6 @@
 #include <linux/irqdomain.h>
 
 #include <asm/exception.h>
-#include <asm/mach/irq.h>
 
 /* Put the bank and irq (32 bits) into the hwirq */
 #define MAKE_HWIRQ(b, n)	((b << 5) | (n))
@@ -242,7 +241,7 @@ static void __exception_irq_entry bcm2835_handle_irq(
 	u32 hwirq;
 
 	while ((hwirq = get_next_armctrl_hwirq()) != ~0)
-		handle_IRQ(irq_linear_revmap(intc.domain, hwirq), regs);
+		handle_domain_irq(intc.domain, hwirq, regs);
 }
 
 static void bcm2836_chained_handle_irq(struct irq_desc *desc)

drivers/irqchip/irq-bcm2836.c

@@ -180,7 +180,7 @@ __exception_irq_entry bcm2836_arm_irqchip_handle_irq(struct pt_regs *regs)
 	} else if (stat) {
 		u32 hwirq = ffs(stat) - 1;
 
-		handle_IRQ(irq_linear_revmap(intc.domain, hwirq), regs);
+		handle_domain_irq(intc.domain, hwirq, regs);
 	}
 }