Merge tag 'arc-4.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc

Pull ARC updates from Vineet Gupta:
 "We have a relatively big changeset for ARC for 4.7.

  The highlight is support for EZChip (now Mellanox) NPS-400 network
  processor, a 400-Gb throughput C-programmable packet processor based
  on ARC700 cores from Synopsys. See

        http://www.mellanox.com/related-docs/prod_npu/PB_NPS-400.pdf

  Also present are irqchip and clocksource drivers for NPS as agreed
  with respective maintainers to go via ARC tree due to an soc header
  dependency.  I have the needed ACKs from Jason, Marc, Daniel.  You
  might run into a trivial merge conflict in drivers/irqchip/*

  This EZChip platform support required some deep changes in ARC
  architecture code and also opportunity to cleanup past sins (legacy
  irq domains, missing irq domain lookup, hard coded timer irqs...)

  Summary:

   - Support for EZChip (now Mellanox) NPS-400 Network processor based
     on ARC700

   - NPS interrupt controller and clocksource drivers

   - ARC timers probed off DT

   - ARC iqrchips switching to linear domain (upgrade from legacy
     domains)"

* tag 'arc-4.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc: (37 commits)
  arc: axs103_smp: Fix CPU frequency to 100MHz for dual-core
  arc: axs10x: Add DT bindings for I2S PLL Clock
  ARC: pae: STRICT_MM_TYPECHECKS was broken
  ARC: Add eznps platform to Kconfig and Makefile
  ARC: [plat-eznps] Use dedicated COMMAND_LINE_SIZE
  ARC: [plat-eznps] Use dedicated cpu_relax()
  ARC: [plat-eznps] Use dedicated identity auxiliary register.
  ARC: [plat-eznps] Use dedicated SMP barriers
  ARC: [plat-eznps] Use dedicated atomic/bitops/cmpxchg
  ARC: [plat-eznps] Use dedicated user stack top
  ARC: [plat-eznps] Add eznps platform
  ARC: [plat-eznps] Add eznps board defconfig and dts
  ARC: Mark secondary cpu online only after all HW setup is done
  ARC: rwlock: disable interrupts in !LLSC variant
  ARC: Make vmalloc size configurable
  ARC: clean out UAPI byteorder.h clean off Kconfig symbol
  irqchip: add nps Internal and external irqchips
  clocksource: Add NPS400 timers driver
  soc: Support for EZchip SoC
  Documentation: Add EZchip vendor to binding list
  ...

3 files changed, 172 insertions, 0 deletions

diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
index 81f88ada3a61..46f10ec17d5c 100644
--- a/drivers/irqchip/Kconfig
+++ b/drivers/irqchip/Kconfig
@@ -253,3 +253,9 @@ config LS_SCFG_MSI
 
 config PARTITION_PERCPU
 	bool
+
+config EZNPS_GIC
+	bool "NPS400 Global Interrupt Manager (GIM)"
+	select IRQ_DOMAIN
+	help
+	  Support the EZchip NPS400 global interrupt controller
diff --git a/drivers/irqchip/Makefile b/drivers/irqchip/Makefile
index f828244b44c2..38853a187607 100644
--- a/drivers/irqchip/Makefile
+++ b/drivers/irqchip/Makefile
@@ -68,3 +68,4 @@ obj-$(CONFIG_IMX_GPCV2)			+= irq-imx-gpcv2.o
 obj-$(CONFIG_PIC32_EVIC)		+= irq-pic32-evic.o
 obj-$(CONFIG_MVEBU_ODMI)		+= irq-mvebu-odmi.o
 obj-$(CONFIG_LS_SCFG_MSI)		+= irq-ls-scfg-msi.o
+obj-$(CONFIG_EZNPS_GIC)			+= irq-eznps.o
diff --git a/drivers/irqchip/irq-eznps.c b/drivers/irqchip/irq-eznps.c
new file mode 100644
index 000000000000..efbf0e4304b7
--- /dev/null
+++ b/drivers/irqchip/irq-eznps.c
@@ -0,0 +1,165 @@
+/*
+ * Copyright (c) 2016, Mellanox Technologies. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/irq.h>
+#include <linux/irqdomain.h>
+#include <linux/irqchip.h>
+#include <soc/nps/common.h>
+
+#define NPS_NR_CPU_IRQS 8  /* number of interrupt lines of NPS400 CPU */
+#define NPS_TIMER0_IRQ  3
+
+/*
+ * NPS400 core includes an Interrupt Controller (IC) support.
+ * All cores can deactivate level irqs at first level control
+ * at cores mesh layer called MTM.
+ * For devices out side chip e.g. uart, network there is another
+ * level called Global Interrupt Manager (GIM).
+ * This second level can control level and edge interrupt.
+ *
+ * NOTE: AUX_IENABLE and CTOP_AUX_IACK are auxiliary registers
+ * with private HW copy per CPU.
+ */
+
+static void nps400_irq_mask(struct irq_data *irqd)
+{
+	unsigned int ienb;
+	unsigned int irq = irqd_to_hwirq(irqd);
+
+	ienb = read_aux_reg(AUX_IENABLE);
+	ienb &= ~(1 << irq);
+	write_aux_reg(AUX_IENABLE, ienb);
+}
+
+static void nps400_irq_unmask(struct irq_data *irqd)
+{
+	unsigned int ienb;
+	unsigned int irq = irqd_to_hwirq(irqd);
+
+	ienb = read_aux_reg(AUX_IENABLE);
+	ienb |= (1 << irq);
+	write_aux_reg(AUX_IENABLE, ienb);
+}
+
+static void nps400_irq_eoi_global(struct irq_data *irqd)
+{
+	unsigned int __maybe_unused irq = irqd_to_hwirq(irqd);
+
+	write_aux_reg(CTOP_AUX_IACK, 1 << irq);
+
+	/* Don't ack GIC before all device access attempts are done */
+	mb();
+
+	nps_ack_gic();
+}
+
+static void nps400_irq_eoi(struct irq_data *irqd)
+{
+	unsigned int __maybe_unused irq = irqd_to_hwirq(irqd);
+
+	write_aux_reg(CTOP_AUX_IACK, 1 << irq);
+}
+
+static struct irq_chip nps400_irq_chip_fasteoi = {
+	.name		= "NPS400 IC Global",
+	.irq_mask	= nps400_irq_mask,
+	.irq_unmask	= nps400_irq_unmask,
+	.irq_eoi	= nps400_irq_eoi_global,
+};
+
+static struct irq_chip nps400_irq_chip_percpu = {
+	.name		= "NPS400 IC",
+	.irq_mask	= nps400_irq_mask,
+	.irq_unmask	= nps400_irq_unmask,
+	.irq_eoi	= nps400_irq_eoi,
+};
+
+static int nps400_irq_map(struct irq_domain *d, unsigned int virq,
+			  irq_hw_number_t hw)
+{
+	switch (hw) {
+	case NPS_TIMER0_IRQ:
+#ifdef CONFIG_SMP
+	case NPS_IPI_IRQ:
+#endif
+		irq_set_percpu_devid(virq);
+		irq_set_chip_and_handler(virq, &nps400_irq_chip_percpu,
+					 handle_percpu_devid_irq);
+		break;
+	default:
+		irq_set_chip_and_handler(virq, &nps400_irq_chip_fasteoi,
+					 handle_fasteoi_irq);
+		break;
+	}
+
+	return 0;
+}
+
+static const struct irq_domain_ops nps400_irq_ops = {
+	.xlate = irq_domain_xlate_onecell,
+	.map = nps400_irq_map,
+};
+
+static int __init nps400_of_init(struct device_node *node,
+				 struct device_node *parent)
+{
+	static struct irq_domain *nps400_root_domain;
+
+	if (parent) {
+		pr_err("DeviceTree incore ic not a root irq controller\n");
+		return -EINVAL;
+	}
+
+	nps400_root_domain = irq_domain_add_linear(node, NPS_NR_CPU_IRQS,
+						   &nps400_irq_ops, NULL);
+
+	if (!nps400_root_domain) {
+		pr_err("nps400 root irq domain not avail\n");
+		return -ENOMEM;
+	}
+
+	/*
+	 * Needed for primary domain lookup to succeed
+	 * This is a primary irqchip, and can never have a parent
+	 */
+	irq_set_default_host(nps400_root_domain);
+
+#ifdef CONFIG_SMP
+	irq_create_mapping(nps400_root_domain, NPS_IPI_IRQ);
+#endif
+
+	return 0;
+}
+IRQCHIP_DECLARE(ezchip_nps400_ic, "ezchip,nps400-ic", nps400_of_init);