Merge branch 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm

Pull ARM updates from Russell King:
 "Bigger items included in this update are:

   - A series of updates from Arnd for ARM randconfig build failures
   - Updates from Dmitry for StrongARM SA-1100 to move IRQ handling to
     drivers/irqchip/
   - Move ARMs SP804 timer to drivers/clocksource/
   - Perf updates from Mark Rutland in preparation to move the ARM perf
     code into drivers/ so it can be shared with ARM64.
   - MCPM updates from Nicolas
   - Add support for taking platform serial number from DT
   - Re-implement Keystone2 physical address space switch to conform to
     architecture requirements
   - Clean up ARMv7 LPAE code, which goes in hand with the Keystone2
     changes.
   - L2C cleanups to avoid unlocking caches if we're prevented by the
     secure support to unlock.
   - Avoid cleaning a potentially dirty cache containing stale data on
     CPU initialisation
   - Add ARM-only entry point for secondary startup (for machines that
     can only call into a Thumb kernel in ARM mode).  Same thing is also
     done for the resume entry point.
   - Provide arch_irqs_disabled via asm-generic
   - Enlarge ARMv7M vector table
   - Always use BFD linker for VDSO, as gold doesn't accept some of the
     options we need.
   - Fix an incorrect BSYM (for Thumb symbols) usage, and convert all
     BSYM compiler macros to a "badr" (for branch address).
   - Shut up compiler warnings provoked by our cmpxchg() implementation.
   - Ensure bad xchg sizes fail to link"

* 'for-linus' of git://ftp.arm.linux.org.uk/~rmk/linux-arm: (75 commits)
  ARM: Fix build if CLKDEV_LOOKUP is not configured
  ARM: fix new BSYM() usage introduced via for-arm-soc branch
  ARM: 8383/1: nommu: avoid deprecated source register on mov
  ARM: 8391/1: l2c: add options to overwrite prefetching behavior
  ARM: 8390/1: irqflags: Get arch_irqs_disabled from asm-generic
  ARM: 8387/1: arm/mm/dma-mapping.c: Add arm_coherent_dma_mmap
  ARM: 8388/1: tcm: Don't crash when TCM banks are protected by TrustZone
  ARM: 8384/1: VDSO: force use of BFD linker
  ARM: 8385/1: VDSO: group link options
  ARM: cmpxchg: avoid warnings from macro-ized cmpxchg() implementations
  ARM: remove __bad_xchg definition
  ARM: 8369/1: ARMv7M: define size of vector table for Vybrid
  ARM: 8382/1: clocksource: make ARM_TIMER_SP804 depend on GENERIC_SCHED_CLOCK
  ARM: 8366/1: move Dual-Timer SP804 driver to drivers/clocksource
  ARM: 8365/1: introduce sp804_timer_disable and remove arm_timer.h inclusion
  ARM: 8364/1: fix BE32 module loading
  ARM: 8360/1: add secondary_startup_arm prototype in header file
  ARM: 8359/1: correct secondary_startup_arm mode
  ARM: proc-v7: sanitise and document registers around errata
  ARM: proc-v7: clean up MIDR access
  ...

2 files changed, 176 insertions, 0 deletions

diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index f8efb7087760..5c9adf1f554d 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -49,3 +49,4 @@ obj-$(CONFIG_ARCH_MEDIATEK)		+= irq-mtk-sysirq.o
 obj-$(CONFIG_ARCH_DIGICOLOR)		+= irq-digicolor.o
 obj-$(CONFIG_RENESAS_H8300H_INTC)	+= irq-renesas-h8300h.o
 obj-$(CONFIG_RENESAS_H8S_INTC)		+= irq-renesas-h8s.o
+obj-$(CONFIG_ARCH_SA1100)		+= irq-sa11x0.o
diff --git a/drivers/irqchip/irq-sa11x0.c b/drivers/irqchip/irq-sa11x0.c
new file mode 100644
index 000000000000..46df2875dc1c
--- /dev/null
+++ b/drivers/irqchip/irq-sa11x0.c
@@ -0,0 +1,175 @@
+/*
+ * Copyright (C) 2015 Dmitry Eremin-Solenikov
+ * Copyright (C) 1999-2001 Nicolas Pitre
+ *
+ * Generic IRQ handling for the SA11x0.
+ *
+ * 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 <linux/init.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/io.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/syscore_ops.h>
+#include <linux/irqchip/irq-sa11x0.h>
+
+#include <soc/sa1100/pwer.h>
+
+#include <asm/exception.h>
+
+#define ICIP	0x00  /* IC IRQ Pending reg. */
+#define ICMR	0x04  /* IC Mask Reg.        */
+#define ICLR	0x08  /* IC Level Reg.       */
+#define ICCR	0x0C  /* IC Control Reg.     */
+#define ICFP	0x10  /* IC FIQ Pending reg. */
+#define ICPR	0x20  /* IC Pending Reg.     */
+
+static void __iomem *iobase;
+
+/*
+ * We don't need to ACK IRQs on the SA1100 unless they're GPIOs
+ * this is for internal IRQs i.e. from IRQ LCD to RTCAlrm.
+ */
+static void sa1100_mask_irq(struct irq_data *d)
+{
+	u32 reg;
+
+	reg = readl_relaxed(iobase + ICMR);
+	reg &= ~BIT(d->hwirq);
+	writel_relaxed(reg, iobase + ICMR);
+}
+
+static void sa1100_unmask_irq(struct irq_data *d)
+{
+	u32 reg;
+
+	reg = readl_relaxed(iobase + ICMR);
+	reg |= BIT(d->hwirq);
+	writel_relaxed(reg, iobase + ICMR);
+}
+
+static int sa1100_set_wake(struct irq_data *d, unsigned int on)
+{
+	return sa11x0_sc_set_wake(d->hwirq, on);
+}
+
+static struct irq_chip sa1100_normal_chip = {
+	.name		= "SC",
+	.irq_ack	= sa1100_mask_irq,
+	.irq_mask	= sa1100_mask_irq,
+	.irq_unmask	= sa1100_unmask_irq,
+	.irq_set_wake	= sa1100_set_wake,
+};
+
+static int sa1100_normal_irqdomain_map(struct irq_domain *d,
+		unsigned int irq, irq_hw_number_t hwirq)
+{
+	irq_set_chip_and_handler(irq, &sa1100_normal_chip,
+				 handle_level_irq);
+	set_irq_flags(irq, IRQF_VALID);
+
+	return 0;
+}
+
+static const struct irq_domain_ops sa1100_normal_irqdomain_ops = {
+	.map = sa1100_normal_irqdomain_map,
+	.xlate = irq_domain_xlate_onetwocell,
+};
+
+static struct irq_domain *sa1100_normal_irqdomain;
+
+static struct sa1100irq_state {
+	unsigned int	saved;
+	unsigned int	icmr;
+	unsigned int	iclr;
+	unsigned int	iccr;
+} sa1100irq_state;
+
+static int sa1100irq_suspend(void)
+{
+	struct sa1100irq_state *st = &sa1100irq_state;
+
+	st->saved = 1;
+	st->icmr = readl_relaxed(iobase + ICMR);
+	st->iclr = readl_relaxed(iobase + ICLR);
+	st->iccr = readl_relaxed(iobase + ICCR);
+
+	/*
+	 * Disable all GPIO-based interrupts.
+	 */
+	writel_relaxed(st->icmr & 0xfffff000, iobase + ICMR);
+
+	return 0;
+}
+
+static void sa1100irq_resume(void)
+{
+	struct sa1100irq_state *st = &sa1100irq_state;
+
+	if (st->saved) {
+		writel_relaxed(st->iccr, iobase + ICCR);
+		writel_relaxed(st->iclr, iobase + ICLR);
+
+		writel_relaxed(st->icmr, iobase + ICMR);
+	}
+}
+
+static struct syscore_ops sa1100irq_syscore_ops = {
+	.suspend	= sa1100irq_suspend,
+	.resume		= sa1100irq_resume,
+};
+
+static int __init sa1100irq_init_devicefs(void)
+{
+	register_syscore_ops(&sa1100irq_syscore_ops);
+	return 0;
+}
+
+device_initcall(sa1100irq_init_devicefs);
+
+static asmlinkage void __exception_irq_entry
+sa1100_handle_irq(struct pt_regs *regs)
+{
+	uint32_t icip, icmr, mask;
+
+	do {
+		icip = readl_relaxed(iobase + ICIP);
+		icmr = readl_relaxed(iobase + ICMR);
+		mask = icip & icmr;
+
+		if (mask == 0)
+			break;
+
+		handle_domain_irq(sa1100_normal_irqdomain,
+				ffs(mask) - 1, regs);
+	} while (1);
+}
+
+void __init sa11x0_init_irq_nodt(int irq_start, resource_size_t io_start)
+{
+	iobase = ioremap(io_start, SZ_64K);
+	if (WARN_ON(!iobase))
+		return;
+
+	/* disable all IRQs */
+	writel_relaxed(0, iobase + ICMR);
+
+	/* all IRQs are IRQ, not FIQ */
+	writel_relaxed(0, iobase + ICLR);
+
+	/*
+	 * Whatever the doc says, this has to be set for the wait-on-irq
+	 * instruction to work... on a SA1100 rev 9 at least.
+	 */
+	writel_relaxed(1, iobase + ICCR);
+
+	sa1100_normal_irqdomain = irq_domain_add_simple(NULL,
+			32, irq_start,
+			&sa1100_normal_irqdomain_ops, NULL);
+
+	set_handle_irq(sa1100_handle_irq);
+}