Merge tag 'rpi-for-3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/swarren/linux-rpi into next/soc

ARM: add basic BCM2835 SoC and Raspberry Pi board support

The BCM2835 is an ARM SoC from Broadcom. This patch adds very basic
support for this SoC; enough to boot the system into an initrd with
UART console, interrupt controller, timers, and a stub clock driver.

Also provided is a similarly basic device tree for the Raspberry Pi
Model B board.

This series was written by Simon Arlott, Chris Boot, and Dom Cobley
downstream, with reference to a Broadcom tree, and modified for upstream
and submitted by Stephen Warren.

* tag 'rpi-for-3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/swarren/linux-rpi:
MAINTAINERS: add an entry for the BCM2835 ARM sub-architecture
ARM: bcm2835: instantiate console UART
ARM: bcm2835: add stub clock driver
ARM: bcm2835: add system timer
ARM: bcm2835: add interrupt controller driver
ARM: add infra-structure for BCM2835 and Raspberry Pi

Documentation/devicetree/bindings/arm/bcm2835.txt

···
+Broadcom BCM2835 device tree bindings
+-------------------------------------------
+
+Boards with the BCM2835 SoC shall have the following properties:
+
+Required root node property:
+
+compatible = "brcm,bcm2835";

Documentation/devicetree/bindings/interrupt-controller/brcm,bcm2835-armctrl-ic.txt

···
+BCM2835 Top-Level ("ARMCTRL") Interrupt Controller
+
+The BCM2835 contains a custom top-level interrupt controller, which supports
+72 interrupt sources using a 2-level register scheme. The interrupt
+controller, or the HW block containing it, is referred to occasionally
+as "armctrl" in the SoC documentation, hence naming of this binding.
+
+Required properties:
+
+- compatible : should be "brcm,bcm2835-armctrl-ic.txt"
+- reg : Specifies base physical address and size of the registers.
+- interrupt-controller : Identifies the node as an interrupt controller
+- #interrupt-cells : Specifies the number of cells needed to encode an
+  interrupt source. The value shall be 2.
+
+  The 1st cell is the interrupt bank; 0 for interrupts in the "IRQ basic
+  pending" register, or 1/2 respectively for interrupts in the "IRQ pending
+  1/2" register.
+
+  The 2nd cell contains the interrupt number within the bank. Valid values
+  are 0..7 for bank 0, and 0..31 for bank 1.
+
+The interrupt sources are as follows:
+
+Bank 0:
+0: ARM_TIMER
+1: ARM_MAILBOX
+2: ARM_DOORBELL_0
+3: ARM_DOORBELL_1
+4: VPU0_HALTED
+5: VPU1_HALTED
+6: ILLEGAL_TYPE0
+7: ILLEGAL_TYPE1
+
+Bank 1:
+0: TIMER0
+1: TIMER1
+2: TIMER2
+3: TIMER3
+4: CODEC0
+5: CODEC1
+6: CODEC2
+7: VC_JPEG
+8: ISP
+9: VC_USB
+10: VC_3D
+11: TRANSPOSER
+12: MULTICORESYNC0
+13: MULTICORESYNC1
+14: MULTICORESYNC2
+15: MULTICORESYNC3
+16: DMA0
+17: DMA1
+18: VC_DMA2
+19: VC_DMA3
+20: DMA4
+21: DMA5
+22: DMA6
+23: DMA7
+24: DMA8
+25: DMA9
+26: DMA10
+27: DMA11
+28: DMA12
+29: AUX
+30: ARM
+31: VPUDMA
+
+Bank 2:
+0: HOSTPORT
+1: VIDEOSCALER
+2: CCP2TX
+3: SDC
+4: DSI0
+5: AVE
+6: CAM0
+7: CAM1
+8: HDMI0
+9: HDMI1
+10: PIXELVALVE1
+11: I2CSPISLV
+12: DSI1
+13: PWA0
+14: PWA1
+15: CPR
+16: SMI
+17: GPIO0
+18: GPIO1
+19: GPIO2
+20: GPIO3
+21: VC_I2C
+22: VC_SPI
+23: VC_I2SPCM
+24: VC_SDIO
+25: VC_UART
+26: SLIMBUS
+27: VEC
+28: CPG
+29: RNG
+30: VC_ARASANSDIO
+31: AVSPMON
+
+Example:
+
+intc: interrupt-controller {
+	compatible = "brcm,bcm2835-armctrl-ic";
+	reg = <0x7e00b200 0x200>;
+	interrupt-controller;
+	#interrupt-cells = <2>;
+};

Documentation/devicetree/bindings/timer/brcm,bcm2835-system-timer.txt

···
+BCM2835 System Timer
+
+The System Timer peripheral provides four 32-bit timer channels and a
+single 64-bit free running counter. Each channel has an output compare
+register, which is compared against the 32 least significant bits of the
+free running counter values, and generates an interrupt.
+
+Required properties:
+
+- compatible : should be "brcm,bcm2835-system-timer.txt"
+- reg : Specifies base physical address and size of the registers.
+- interrupts : A list of 4 interrupt sinks; one per timer channel.
+- clock-frequency : The frequency of the clock that drives the counter, in Hz.
+
+Example:
+
+timer {
+	compatible = "brcm,bcm2835-system-timer";
+	reg = <0x7e003000 0x1000>;
+	interrupts = <1 0>, <1 1>, <1 2>, <1 3>;
+	clock-frequency = <1000000>;
+};

Documentation/devicetree/bindings/vendor-prefixes.txt

···
 arm	ARM Ltd.
 atmel	Atmel Corporation
 bosch	Bosch Sensortec GmbH
+brcm	Broadcom Corporation
 cavium	Cavium, Inc.
 chrp	Common Hardware Reference Platform
 cortina	Cortina Systems, Inc.

MAINTAINERS

···
 S:	Supported
 F:	drivers/net/ethernet/broadcom/bnx2x/
 
+BROADCOM BCM2835 ARM ARCHICTURE
+M:	Stephen Warren <[e-mail]>
+L:	[e-mail] (moderated for non-subscribers)
+T:	git git://git.kernel.org/pub/scm/linux/kernel/git/swarren/linux-rpi.git
+S:	Maintained
+F:	arch/arm/mach-bcm2835/
+F:	arch/arm/boot/dts/bcm2835*
+F:	arch/arm/configs/bcm2835_defconfig
+F:	drivers/*/*bcm2835*
+
 BROADCOM TG3 GIGABIT ETHERNET DRIVER
 M:	Matt Carlson <[e-mail]>
 M:	Michael Chan <[e-mail]>

arch/arm/Kconfig

···
 	  This enables support for systems based on Atmel
 	  AT91RM9200 and AT91SAM9* processors.
 
+config ARCH_BCM2835
+	bool "Broadcom BCM2835 family"
+	select ARCH_WANT_OPTIONAL_GPIOLIB
+	select ARM_AMBA
+	select ARM_ERRATA_411920
+	select ARM_TIMER_SP804
+	select CLKDEV_LOOKUP
+	select COMMON_CLK
+	select CPU_V6
+	select GENERIC_CLOCKEVENTS
+	select MULTI_IRQ_HANDLER
+	select SPARSE_IRQ
+	select USE_OF
+	help
+	  This enables support for the Broadcom BCM2835 SoC. This SoC is
+	  use in the Raspberry Pi, and Roku 2 devices.
+
 config ARCH_BCMRING
 	bool "Broadcom BCMRING"
 	depends on MMU

arch/arm/Makefile

···
 # Machine directory name.  This list is sorted alphanumerically
 # by CONFIG_* macro name.
 machine-$(CONFIG_ARCH_AT91)		:= at91
+machine-$(CONFIG_ARCH_BCM2835)		:= bcm2835
 machine-$(CONFIG_ARCH_BCMRING)		:= bcmring
 machine-$(CONFIG_ARCH_CLPS711X)		:= clps711x
 machine-$(CONFIG_ARCH_CNS3XXX)		:= cns3xxx

arch/arm/boot/dts/bcm2835-rpi-b.dts

···
+/dts-v1/;
+/memreserve/ 0x0c000000 0x04000000;
+/include/ "bcm2835.dtsi"
+
+/ {
+	compatible = "raspberrypi,model-b", "brcm,bcm2835";
+	model = "Raspberry Pi Model B";
+
+	memory {
+		reg = <0 0x10000000>;
+	};
+};

arch/arm/boot/dts/bcm2835.dtsi

···
+/include/ "skeleton.dtsi"
+
+/ {
+	compatible = "brcm,bcm2835";
+	model = "BCM2835";
+	interrupt-parent = <&intc>;
+
+	chosen {
+		bootargs = "earlyprintk console=ttyAMA0";
+	};
+
+	soc {
+		compatible = "simple-bus";
+		#address-cells = <1>;
+		#size-cells = <1>;
+		ranges = <0x7e000000 0x20000000 0x02000000>;
+
+		timer {
+			compatible = "brcm,bcm2835-system-timer";
+			reg = <0x7e003000 0x1000>;
+			interrupts = <1 0>, <1 1>, <1 2>, <1 3>;
+			clock-frequency = <1000000>;
+		};
+
+		intc: interrupt-controller {
+			compatible = "brcm,bcm2835-armctrl-ic";
+			reg = <0x7e00b200 0x200>;
+			interrupt-controller;
+			#interrupt-cells = <2>;
+		};
+
+		uart@20201000 {
+			compatible = "brcm,bcm2835-pl011", "arm,pl011", "arm,primecell";
+			reg = <0x7e201000 0x1000>;
+			interrupts = <2 25>;
+			clock-frequency = <3000000>;
+		};
+	};
+};

arch/arm/configs/bcm2835_defconfig

···
+CONFIG_EXPERIMENTAL=y
+# CONFIG_LOCALVERSION_AUTO is not set
+CONFIG_SYSVIPC=y
+CONFIG_BSD_PROCESS_ACCT=y
+CONFIG_BSD_PROCESS_ACCT_V3=y
+CONFIG_FHANDLE=y
+CONFIG_NO_HZ=y
+CONFIG_HIGH_RES_TIMERS=y
+CONFIG_LOG_BUF_SHIFT=18
+CONFIG_CGROUP_FREEZER=y
+CONFIG_CGROUP_DEVICE=y
+CONFIG_CPUSETS=y
+CONFIG_CGROUP_CPUACCT=y
+CONFIG_RESOURCE_COUNTERS=y
+CONFIG_CGROUP_PERF=y
+CONFIG_CFS_BANDWIDTH=y
+CONFIG_RT_GROUP_SCHED=y
+CONFIG_NAMESPACES=y
+CONFIG_SCHED_AUTOGROUP=y
+CONFIG_RELAY=y
+CONFIG_BLK_DEV_INITRD=y
+CONFIG_RD_BZIP2=y
+CONFIG_RD_LZMA=y
+CONFIG_RD_XZ=y
+CONFIG_RD_LZO=y
+CONFIG_CC_OPTIMIZE_FOR_SIZE=y
+CONFIG_KALLSYMS_ALL=y
+CONFIG_EMBEDDED=y
+# CONFIG_COMPAT_BRK is not set
+CONFIG_PROFILING=y
+CONFIG_OPROFILE=y
+CONFIG_JUMP_LABEL=y
+# CONFIG_BLOCK is not set
+CONFIG_ARCH_BCM2835=y
+CONFIG_PREEMPT_VOLUNTARY=y
+CONFIG_AEABI=y
+CONFIG_COMPACTION=y
+CONFIG_KSM=y
+CONFIG_DEFAULT_MMAP_MIN_ADDR=65536
+CONFIG_CLEANCACHE=y
+CONFIG_SECCOMP=y
+CONFIG_CC_STACKPROTECTOR=y
+CONFIG_KEXEC=y
+CONFIG_CRASH_DUMP=y
+CONFIG_VFP=y
+# CONFIG_CORE_DUMP_DEFAULT_ELF_HEADERS is not set
+# CONFIG_SUSPEND is not set
+CONFIG_DEVTMPFS=y
+CONFIG_DEVTMPFS_MOUNT=y
+# CONFIG_STANDALONE is not set
+# CONFIG_INPUT_MOUSEDEV is not set
+# CONFIG_INPUT_KEYBOARD is not set
+# CONFIG_INPUT_MOUSE is not set
+# CONFIG_SERIO is not set
+# CONFIG_VT is not set
+# CONFIG_UNIX98_PTYS is not set
+# CONFIG_LEGACY_PTYS is not set
+# CONFIG_DEVKMEM is not set
+CONFIG_SERIAL_AMBA_PL011=y
+CONFIG_SERIAL_AMBA_PL011_CONSOLE=y
+CONFIG_TTY_PRINTK=y
+# CONFIG_HW_RANDOM is not set
+# CONFIG_HWMON is not set
+# CONFIG_USB_SUPPORT is not set
+# CONFIG_IOMMU_SUPPORT is not set
+# CONFIG_FILE_LOCKING is not set
+# CONFIG_DNOTIFY is not set
+# CONFIG_INOTIFY_USER is not set
+# CONFIG_PROC_FS is not set
+# CONFIG_SYSFS is not set
+# CONFIG_MISC_FILESYSTEMS is not set
+CONFIG_PRINTK_TIME=y
+# CONFIG_ENABLE_WARN_DEPRECATED is not set
+# CONFIG_ENABLE_MUST_CHECK is not set
+CONFIG_UNUSED_SYMBOLS=y
+CONFIG_LOCKUP_DETECTOR=y
+CONFIG_DEBUG_INFO=y
+CONFIG_DEBUG_MEMORY_INIT=y
+CONFIG_BOOT_PRINTK_DELAY=y
+CONFIG_SCHED_TRACER=y
+CONFIG_STACK_TRACER=y
+CONFIG_FUNCTION_PROFILER=y
+CONFIG_DYNAMIC_DEBUG=y
+CONFIG_KGDB=y
+CONFIG_KGDB_KDB=y
+CONFIG_TEST_KSTRTOX=y
+CONFIG_STRICT_DEVMEM=y
+CONFIG_DEBUG_LL=y
+CONFIG_EARLY_PRINTK=y
+# CONFIG_XZ_DEC_X86 is not set
+# CONFIG_XZ_DEC_POWERPC is not set
+# CONFIG_XZ_DEC_IA64 is not set
+# CONFIG_XZ_DEC_ARM is not set
+# CONFIG_XZ_DEC_ARMTHUMB is not set
+# CONFIG_XZ_DEC_SPARC is not set

arch/arm/mach-bcm2835/Makefile

···
+obj-y += bcm2835.o

arch/arm/mach-bcm2835/Makefile.boot

···
+   zreladdr-y := 0x00008000
+params_phys-y := 0x00000100
+initrd_phys-y := 0x00800000
+
+dtb-y += bcm2835-rpi-b.dtb

arch/arm/mach-bcm2835/bcm2835.c

···
+/*
+ * Copyright (C) 2010 Broadcom
+ *
+ * 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.
+ */
+
+#include <linux/init.h>
+#include <linux/irqchip/bcm2835.h>
+#include <linux/of_platform.h>
+#include <linux/bcm2835_timer.h>
+#include <linux/clk/bcm2835.h>
+
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+
+#include <mach/bcm2835_soc.h>
+
+static struct map_desc io_map __initdata = {
+	.virtual = BCM2835_PERIPH_VIRT,
+	.pfn = __phys_to_pfn(BCM2835_PERIPH_PHYS),
+	.length = BCM2835_PERIPH_SIZE,
+	.type = MT_DEVICE
+};
+
+void __init bcm2835_map_io(void)
+{
+	iotable_init(&io_map, 1);
+}
+
+void __init bcm2835_init(void)
+{
+	int ret;
+
+	bcm2835_init_clocks();
+
+	ret = of_platform_populate(NULL, of_default_bus_match_table, NULL,
+				   NULL);
+	if (ret) {
+		pr_err("of_platform_populate failed: %d\n", ret);
+		BUG();
+	}
+}
+
+static const char * const bcm2835_compat[] = {
+	"brcm,bcm2835",
+	NULL
+};
+
+DT_MACHINE_START(BCM2835, "BCM2835")
+	.map_io = bcm2835_map_io,
+	.init_irq = bcm2835_init_irq,
+	.handle_irq = bcm2835_handle_irq,
+	.init_machine = bcm2835_init,
+	.timer = &bcm2835_timer,
+	.dt_compat = bcm2835_compat
+MACHINE_END

arch/arm/mach-bcm2835/include/mach/bcm2835_soc.h

···
+/*
+ * Copyright (C) 2012 Stephen Warren
+ *
+ * Derived from code:
+ * Copyright (C) 2010 Broadcom
+ *
+ * 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.
+ */
+
+#ifndef __MACH_BCM2835_BCM2835_SOC_H__
+#define __MACH_BCM2835_BCM2835_SOC_H__
+
+#include <asm/sizes.h>
+
+#define BCM2835_PERIPH_PHYS	0x20000000
+#define BCM2835_PERIPH_VIRT	0xf0000000
+#define BCM2835_PERIPH_SIZE	SZ_16M
+#define BCM2835_DEBUG_PHYS	0x20201000
+#define BCM2835_DEBUG_VIRT	0xf0201000
+
+#endif

arch/arm/mach-bcm2835/include/mach/debug-macro.S

···
+/*
+ * Debugging macro include header
+ *
+ * Copyright (C) 2010 Broadcom
+ * Copyright (C) 1994-1999 Russell King
+ * Moved from linux/arch/arm/kernel/debug.S by Ben Dooks
+ *
+ * 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.
+ *
+ */
+
+#include <mach/bcm2835_soc.h>
+
+	.macro	addruart, rp, rv, tmp
+	ldr	\rp, =BCM2835_DEBUG_PHYS
+	ldr	\rv, =BCM2835_DEBUG_VIRT
+	.endm
+
+#include <asm/hardware/debug-pl01x.S>

arch/arm/mach-bcm2835/include/mach/timex.h

···
+/*
+ *  BCM2835 system clock frequency
+ *
+ *  Copyright (C) 2010 Broadcom
+ *
+ * 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
+ */
+
+#ifndef __ASM_ARCH_TIMEX_H
+#define __ASM_ARCH_TIMEX_H
+
+#define CLOCK_TICK_RATE		(1000000)
+
+#endif

arch/arm/mach-bcm2835/include/mach/uncompress.h

···
+/*
+ * Copyright (C) 2010 Broadcom
+ * Copyright (C) 2003 ARM Limited
+ *
+ * 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.
+ */
+
+#include <linux/io.h>
+#include <linux/amba/serial.h>
+#include <mach/bcm2835_soc.h>
+
+#define UART0_BASE BCM2835_DEBUG_PHYS
+
+#define BCM2835_UART_DR IOMEM(UART0_BASE + UART01x_DR)
+#define BCM2835_UART_FR IOMEM(UART0_BASE + UART01x_FR)
+#define BCM2835_UART_CR IOMEM(UART0_BASE + UART011_CR)
+
+static inline void putc(int c)
+{
+	while (__raw_readl(BCM2835_UART_FR) & UART01x_FR_TXFF)
+		barrier();
+
+	__raw_writel(c, BCM2835_UART_DR);
+}
+
+static inline void flush(void)
+{
+	int fr;
+
+	do {
+		fr = __raw_readl(BCM2835_UART_FR);
+		barrier();
+	} while ((fr & (UART011_FR_TXFE | UART01x_FR_BUSY)) != UART011_FR_TXFE);
+}
+
+#define arch_decomp_setup()
+#define arch_decomp_wdog()

drivers/Kconfig

···
 
 source "drivers/pwm/Kconfig"
 
+source "drivers/irqchip/Kconfig"
+
 endmenu

drivers/Makefile

···
 # Rewritten to use lists instead of if-statements.
 #
 
+obj-y				+= irqchip/
+
 # GPIO must come after pinctrl as gpios may need to mux pins etc
 obj-y				+= pinctrl/
 obj-y				+= gpio/

drivers/clk/Makefile

···
 obj-$(CONFIG_COMMON_CLK)	+= clk.o clk-fixed-rate.o clk-gate.o \
 				   clk-mux.o clk-divider.o clk-fixed-factor.o
 # SoCs specific
+obj-$(CONFIG_ARCH_BCM2835)	+= clk-bcm2835.o
 obj-$(CONFIG_ARCH_NOMADIK)	+= clk-nomadik.o
 obj-$(CONFIG_ARCH_HIGHBANK)	+= clk-highbank.o
 obj-$(CONFIG_ARCH_MXS)		+= mxs/

drivers/clk/clk-bcm2835.c

···
+/*
+ * Copyright (C) 2010 Broadcom
+ * Copyright (C) 2012 Stephen Warren
+ *
+ * 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/clk-provider.h>
+#include <linux/clkdev.h>
+#include <linux/clk/bcm2835.h>
+
+/*
+ * These are fixed clocks. They're probably not all root clocks and it may
+ * be possible to turn them on and off but until this is mapped out better
+ * it's the only way they can be used.
+ */
+void __init bcm2835_init_clocks(void)
+{
+	struct clk *clk;
+	int ret;
+
+	clk = clk_register_fixed_rate(NULL, "sys_pclk", NULL, CLK_IS_ROOT,
+					250000000);
+	if (!clk)
+		pr_err("sys_pclk not registered\n");
+
+	clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL, CLK_IS_ROOT,
+					126000000);
+	if (!clk)
+		pr_err("apb_pclk not registered\n");
+
+	clk = clk_register_fixed_rate(NULL, "uart0_pclk", NULL, CLK_IS_ROOT,
+					3000000);
+	if (!clk)
+		pr_err("uart0_pclk not registered\n");
+	ret = clk_register_clkdev(clk, NULL, "20201000.uart");
+	if (ret)
+		pr_err("uart0_pclk alias not registered\n");
+
+	clk = clk_register_fixed_rate(NULL, "uart1_pclk", NULL, CLK_IS_ROOT,
+					125000000);
+	if (!clk)
+		pr_err("uart1_pclk not registered\n");
+	ret = clk_register_clkdev(clk, NULL, "20215000.uart");
+	if (ret)
+		pr_err("uart0_pclk alias not registered\n");
+}

drivers/clocksource/Makefile

···
 obj-$(CONFIG_DW_APB_TIMER_OF)	+= dw_apb_timer_of.o
 obj-$(CONFIG_CLKSRC_DBX500_PRCMU)	+= clksrc-dbx500-prcmu.o
 obj-$(CONFIG_ARMADA_370_XP_TIMER)	+= time-armada-370-xp.o
+obj-$(CONFIG_ARCH_BCM2835)	+= bcm2835_timer.o

drivers/clocksource/bcm2835_timer.c

···
+/*
+ * Copyright 2012 Simon Arlott
+ *
+ * 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/bcm2835_timer.h>
+#include <linux/bitops.h>
+#include <linux/clockchips.h>
+#include <linux/clocksource.h>
+#include <linux/interrupt.h>
+#include <linux/irqreturn.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/of_platform.h>
+#include <linux/slab.h>
+#include <linux/string.h>
+
+#include <asm/sched_clock.h>
+#include <asm/irq.h>
+
+#define REG_CONTROL	0x00
+#define REG_COUNTER_LO	0x04
+#define REG_COUNTER_HI	0x08
+#define REG_COMPARE(n)	(0x0c + (n) * 4)
+#define MAX_TIMER	3
+#define DEFAULT_TIMER	3
+
+struct bcm2835_timer {
+	void __iomem *control;
+	void __iomem *compare;
+	int match_mask;
+	struct clock_event_device evt;
+	struct irqaction act;
+};
+
+static void __iomem *system_clock __read_mostly;
+
+static u32 notrace bcm2835_sched_read(void)
+{
+	return readl_relaxed(system_clock);
+}
+
+static void bcm2835_time_set_mode(enum clock_event_mode mode,
+	struct clock_event_device *evt_dev)
+{
+	switch (mode) {
+	case CLOCK_EVT_MODE_ONESHOT:
+	case CLOCK_EVT_MODE_UNUSED:
+	case CLOCK_EVT_MODE_SHUTDOWN:
+	case CLOCK_EVT_MODE_RESUME:
+		break;
+	default:
+		WARN(1, "%s: unhandled event mode %d\n", __func__, mode);
+		break;
+	}
+}
+
+static int bcm2835_time_set_next_event(unsigned long event,
+	struct clock_event_device *evt_dev)
+{
+	struct bcm2835_timer *timer = container_of(evt_dev,
+		struct bcm2835_timer, evt);
+	writel_relaxed(readl_relaxed(system_clock) + event,
+		timer->compare);
+	return 0;
+}
+
+static irqreturn_t bcm2835_time_interrupt(int irq, void *dev_id)
+{
+	struct bcm2835_timer *timer = dev_id;
+	void (*event_handler)(struct clock_event_device *);
+	if (readl_relaxed(timer->control) & timer->match_mask) {
+		writel_relaxed(timer->match_mask, timer->control);
+
+		event_handler = ACCESS_ONCE(timer->evt.event_handler);
+		if (event_handler)
+			event_handler(&timer->evt);
+		return IRQ_HANDLED;
+	} else {
+		return IRQ_NONE;
+	}
+}
+
+static struct of_device_id bcm2835_time_match[] __initconst = {
+	{ .compatible = "brcm,bcm2835-system-timer" },
+	{}
+};
+
+static void __init bcm2835_time_init(void)
+{
+	struct device_node *node;
+	void __iomem *base;
+	u32 freq;
+	int irq;
+	struct bcm2835_timer *timer;
+
+	node = of_find_matching_node(NULL, bcm2835_time_match);
+	if (!node)
+		panic("No bcm2835 timer node");
+
+	base = of_iomap(node, 0);
+	if (!base)
+		panic("Can't remap registers");
+
+	if (of_property_read_u32(node, "clock-frequency", &freq))
+		panic("Can't read clock-frequency");
+
+	system_clock = base + REG_COUNTER_LO;
+	setup_sched_clock(bcm2835_sched_read, 32, freq);
+
+	clocksource_mmio_init(base + REG_COUNTER_LO, node->name,
+		freq, 300, 32, clocksource_mmio_readl_up);
+
+	irq = irq_of_parse_and_map(node, DEFAULT_TIMER);
+	if (irq <= 0)
+		panic("Can't parse IRQ");
+
+	timer = kzalloc(sizeof(*timer), GFP_KERNEL);
+	if (!timer)
+		panic("Can't allocate timer struct\n");
+
+	timer->control = base + REG_CONTROL;
+	timer->compare = base + REG_COMPARE(DEFAULT_TIMER);
+	timer->match_mask = BIT(DEFAULT_TIMER);
+	timer->evt.name = node->name;
+	timer->evt.rating = 300;
+	timer->evt.features = CLOCK_EVT_FEAT_ONESHOT;
+	timer->evt.set_mode = bcm2835_time_set_mode;
+	timer->evt.set_next_event = bcm2835_time_set_next_event;
+	timer->evt.cpumask = cpumask_of(0);
+	timer->act.name = node->name;
+	timer->act.flags = IRQF_TIMER | IRQF_SHARED;
+	timer->act.dev_id = timer;
+	timer->act.handler = bcm2835_time_interrupt;
+
+	if (setup_irq(irq, &timer->act))
+		panic("Can't set up timer IRQ\n");
+
+	clockevents_config_and_register(&timer->evt, freq, 0xf, 0xffffffff);
+
+	pr_info("bcm2835: system timer (irq = %d)\n", irq);
+}
+
+struct sys_timer bcm2835_timer = {
+	.init = bcm2835_time_init,
+};

drivers/irqchip/Makefile

···
+obj-$(CONFIG_ARCH_BCM2835) += irq-bcm2835.o

drivers/irqchip/irq-bcm2835.c

···
+/*
+ * Copyright 2010 Broadcom
+ * Copyright 2012 Simon Arlott, Chris Boot, Stephen Warren
+ *
+ * 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.
+ *
+ * Quirk 1: Shortcut interrupts don't set the bank 1/2 register pending bits
+ *
+ * If an interrupt fires on bank 1 that isn't in the shortcuts list, bit 8
+ * on bank 0 is set to signify that an interrupt in bank 1 has fired, and
+ * to look in the bank 1 status register for more information.
+ *
+ * If an interrupt fires on bank 1 that _is_ in the shortcuts list, its
+ * shortcut bit in bank 0 is set as well as its interrupt bit in the bank 1
+ * status register, but bank 0 bit 8 is _not_ set.
+ *
+ * Quirk 2: You can't mask the register 1/2 pending interrupts
+ *
+ * In a proper cascaded interrupt controller, the interrupt lines with
+ * cascaded interrupt controllers on them are just normal interrupt lines.
+ * You can mask the interrupts and get on with things. With this controller
+ * you can't do that.
+ *
+ * Quirk 3: The shortcut interrupts can't be (un)masked in bank 0
+ *
+ * Those interrupts that have shortcuts can only be masked/unmasked in
+ * their respective banks' enable/disable registers. Doing so in the bank 0
+ * enable/disable registers has no effect.
+ *
+ * The FIQ control register:
+ *  Bits 0-6: IRQ (index in order of interrupts from banks 1, 2, then 0)
+ *  Bit    7: Enable FIQ generation
+ *  Bits  8+: Unused
+ *
+ * An interrupt must be disabled before configuring it for FIQ generation
+ * otherwise both handlers will fire at the same time!
+ */
+
+#include <linux/io.h>
+#include <linux/slab.h>
+#include <linux/of_address.h>
+#include <linux/of_irq.h>
+#include <linux/irqdomain.h>
+#include <linux/irqchip/bcm2835.h>
+
+#include <asm/exception.h>
+
+/* Put the bank and irq (32 bits) into the hwirq */
+#define MAKE_HWIRQ(b, n)	((b << 5) | (n))
+#define HWIRQ_BANK(i)		(i >> 5)
+#define HWIRQ_BIT(i)		BIT(i & 0x1f)
+
+#define NR_IRQS_BANK0		8
+#define BANK0_HWIRQ_MASK	0xff
+/* Shortcuts can't be disabled so any unknown new ones need to be masked */
+#define SHORTCUT1_MASK		0x00007c00
+#define SHORTCUT2_MASK		0x001f8000
+#define SHORTCUT_SHIFT		10
+#define BANK1_HWIRQ		BIT(8)
+#define BANK2_HWIRQ		BIT(9)
+#define BANK0_VALID_MASK	(BANK0_HWIRQ_MASK | BANK1_HWIRQ | BANK2_HWIRQ \
+					| SHORTCUT1_MASK | SHORTCUT2_MASK)
+
+#define REG_FIQ_CONTROL		0x0c
+
+#define NR_BANKS		3
+#define IRQS_PER_BANK		32
+
+static int reg_pending[] __initconst = { 0x00, 0x04, 0x08 };
+static int reg_enable[] __initconst = { 0x18, 0x10, 0x14 };
+static int reg_disable[] __initconst = { 0x24, 0x1c, 0x20 };
+static int bank_irqs[] __initconst = { 8, 32, 32 };
+
+static const int shortcuts[] = {
+	7, 9, 10, 18, 19,		/* Bank 1 */
+	21, 22, 23, 24, 25, 30		/* Bank 2 */
+};
+
+struct armctrl_ic {
+	void __iomem *base;
+	void __iomem *pending[NR_BANKS];
+	void __iomem *enable[NR_BANKS];
+	void __iomem *disable[NR_BANKS];
+	struct irq_domain *domain;
+};
+
+static struct armctrl_ic intc __read_mostly;
+
+static void armctrl_mask_irq(struct irq_data *d)
+{
+	writel_relaxed(HWIRQ_BIT(d->hwirq), intc.disable[HWIRQ_BANK(d->hwirq)]);
+}
+
+static void armctrl_unmask_irq(struct irq_data *d)
+{
+	writel_relaxed(HWIRQ_BIT(d->hwirq), intc.enable[HWIRQ_BANK(d->hwirq)]);
+}
+
+static struct irq_chip armctrl_chip = {
+	.name = "ARMCTRL-level",
+	.irq_mask = armctrl_mask_irq,
+	.irq_unmask = armctrl_unmask_irq
+};
+
+static int armctrl_xlate(struct irq_domain *d, struct device_node *ctrlr,
+	const u32 *intspec, unsigned int intsize,
+	unsigned long *out_hwirq, unsigned int *out_type)
+{
+	if (WARN_ON(intsize != 2))
+		return -EINVAL;
+
+	if (WARN_ON(intspec[0] >= NR_BANKS))
+		return -EINVAL;
+
+	if (WARN_ON(intspec[1] >= IRQS_PER_BANK))
+		return -EINVAL;
+
+	if (WARN_ON(intspec[0] == 0 && intspec[1] >= NR_IRQS_BANK0))
+		return -EINVAL;
+
+	*out_hwirq = MAKE_HWIRQ(intspec[0], intspec[1]);
+	*out_type = IRQ_TYPE_NONE;
+	return 0;
+}
+
+static struct irq_domain_ops armctrl_ops = {
+	.xlate = armctrl_xlate
+};
+
+static int __init armctrl_of_init(struct device_node *node,
+	struct device_node *parent)
+{
+	void __iomem *base;
+	int irq, b, i;
+
+	base = of_iomap(node, 0);
+	if (!base)
+		panic("%s: unable to map IC registers\n",
+			node->full_name);
+
+	intc.domain = irq_domain_add_linear(node, MAKE_HWIRQ(NR_BANKS, 0),
+			&armctrl_ops, NULL);
+	if (!intc.domain)
+		panic("%s: unable to create IRQ domain\n", node->full_name);
+
+	for (b = 0; b < NR_BANKS; b++) {
+		intc.pending[b] = base + reg_pending[b];
+		intc.enable[b] = base + reg_enable[b];
+		intc.disable[b] = base + reg_disable[b];
+
+		for (i = 0; i < bank_irqs[b]; i++) {
+			irq = irq_create_mapping(intc.domain, MAKE_HWIRQ(b, i));
+			BUG_ON(irq <= 0);
+			irq_set_chip_and_handler(irq, &armctrl_chip,
+				handle_level_irq);
+			set_irq_flags(irq, IRQF_VALID | IRQF_PROBE);
+		}
+	}
+	return 0;
+}
+
+static struct of_device_id irq_of_match[] __initconst = {
+	{ .compatible = "brcm,bcm2835-armctrl-ic", .data = armctrl_of_init }
+};
+
+void __init bcm2835_init_irq(void)
+{
+	of_irq_init(irq_of_match);
+}
+
+/*
+ * Handle each interrupt across the entire interrupt controller.  This reads the
+ * status register before handling each interrupt, which is necessary given that
+ * handle_IRQ may briefly re-enable interrupts for soft IRQ handling.
+ */
+
+static void armctrl_handle_bank(int bank, struct pt_regs *regs)
+{
+	u32 stat, irq;
+
+	while ((stat = readl_relaxed(intc.pending[bank]))) {
+		irq = MAKE_HWIRQ(bank, ffs(stat) - 1);
+		handle_IRQ(irq_linear_revmap(intc.domain, irq), regs);
+	}
+}
+
+static void armctrl_handle_shortcut(int bank, struct pt_regs *regs,
+	u32 stat)
+{
+	u32 irq = MAKE_HWIRQ(bank, shortcuts[ffs(stat >> SHORTCUT_SHIFT) - 1]);
+	handle_IRQ(irq_linear_revmap(intc.domain, irq), regs);
+}
+
+asmlinkage void __exception_irq_entry bcm2835_handle_irq(
+	struct pt_regs *regs)
+{
+	u32 stat, irq;
+
+	while ((stat = readl_relaxed(intc.pending[0]) & BANK0_VALID_MASK)) {
+		if (stat & BANK0_HWIRQ_MASK) {
+			irq = MAKE_HWIRQ(0, ffs(stat & BANK0_HWIRQ_MASK) - 1);
+			handle_IRQ(irq_linear_revmap(intc.domain, irq), regs);
+		} else if (stat & SHORTCUT1_MASK) {
+			armctrl_handle_shortcut(1, regs, stat & SHORTCUT1_MASK);
+		} else if (stat & SHORTCUT2_MASK) {
+			armctrl_handle_shortcut(2, regs, stat & SHORTCUT2_MASK);
+		} else if (stat & BANK1_HWIRQ) {
+			armctrl_handle_bank(1, regs);
+		} else if (stat & BANK2_HWIRQ) {
+			armctrl_handle_bank(2, regs);
+		} else {
+			BUG();
+		}
+	}
+}

include/linux/bcm2835_timer.h

···
+/*
+ * Copyright 2012 Simon Arlott
+ *
+ * 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.
+ */
+
+#ifndef __BCM2835_TIMER_H
+#define __BCM2835_TIMER_H
+
+#include <asm/mach/time.h>
+
+extern struct sys_timer bcm2835_timer;
+
+#endif

include/linux/clk/bcm2835.h

···
+/*
+ * Copyright (C) 2010 Broadcom
+ *
+ * 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
+ */
+
+#ifndef __LINUX_CLK_BCM2835_H_
+#define __LINUX_CLK_BCM2835_H_
+
+void __init bcm2835_init_clocks(void);
+
+#endif

include/linux/irqchip/bcm2835.h

···
+/*
+ * Copyright (C) 2010 Broadcom
+ *
+ * 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
+ */
+
+#ifndef __LINUX_IRQCHIP_BCM2835_H_
+#define __LINUX_IRQCHIP_BCM2835_H_
+
+#include <asm/exception.h>
+
+extern void bcm2835_init_irq(void);
+
+extern asmlinkage void __exception_irq_entry bcm2835_handle_irq(
+	struct pt_regs *regs);
+
+#endif