MIPS: BMIPS: Delete the irqchip driver from irq.c

BCM3384/BCM63xx can use the common drivers/irqchip/irq-bcm7120-l2.c for
this purpose; BCM7xxx will use drivers/irqchip/irq-bcm7038-l1.c.  We no
longer need this code under arch/mips.

[ralf@linux-mips.org: Fix conflicts.]
Signed-off-by: Kevin Cernekee <cernekee@gmail.com>
Cc: f.fainelli@gmail.com
Cc: jaedon.shin@gmail.com
Cc: abrestic@chromium.org
Cc: tglx@linutronix.de
Cc: jason@lakedaemon.net
Cc: jogo@openwrt.org
Cc: arnd@arndb.de
Cc: computersforpeace@gmail.com
Cc: linux-mips@linux-mips.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/8853/Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

Documentation/devicetree/bindings/mips/brcm/bcm3384-intc.txt

-* Interrupt Controller
-
-Properties:
-- compatible: "brcm,bcm3384-intc"
-
-  Compatibility with BCM3384 and possibly other BCM33xx/BCM63xx SoCs.
-
-- reg: Address/length pairs for each mask/status register set.  Length must
-  be 8.  If multiple register sets are specified, the first set will
-  handle IRQ offsets 0..31, the second set 32..63, and so on.
-
-- interrupt-controller: This is an interrupt controller.
-
-- #interrupt-cells: Must be <1>.  Just a simple IRQ offset; no level/edge
-  or polarity configuration is possible with this controller.
-
-- interrupt-parent: This controller is cascaded from a MIPS CPU HW IRQ, or
-  from another INTC.
-
-- interrupts: The IRQ on the parent controller.
-
-Example:
-	periph_intc: periph_intc@14e00038 {
-		compatible = "brcm,bcm3384-intc";
-
-		/*
-		 * IRQs 0..31:  mask reg 0x14e00038, status reg 0x14e0003c
-		 * IRQs 32..63: mask reg 0x14e00340, status reg 0x14e00344
-		 */
-		reg = <0x14e00038 0x8 0x14e00340 0x8>;
-
-		interrupt-controller;
-		#interrupt-cells = <1>;
-
-		interrupt-parent = <&cpu_intc>;
-		interrupts = <4>;
-	};

arch/mips/bmips/irq.c

@@ -3,191 +3,36 @@
  * under the terms of the GNU General Public License version 2 as published
  * by the Free Software Foundation.
  *
- * Partially based on arch/mips/ralink/irq.c
- *
- * Copyright (C) 2009 Gabor Juhos <juhosg@openwrt.org>
- * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
- * Copyright (C) 2014 Kevin Cernekee <cernekee@gmail.com>
+ * Copyright (C) 2014 Broadcom Corporation
+ * Author: Kevin Cernekee <cernekee@gmail.com>
  */
 
-#include <linux/io.h>
-#include <linux/bitops.h>
-#include <linux/of_platform.h>
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
-#include <linux/irqdomain.h>
-#include <linux/interrupt.h>
-#include <linux/slab.h>
-#include <linux/spinlock.h>
+#include <linux/of.h>
+#include <linux/irqchip.h>
 
 #include <asm/bmips.h>
+#include <asm/irq.h>
 #include <asm/irq_cpu.h>
-#include <asm/mipsregs.h>
-
-/* INTC register offsets */
-#define INTC_REG_ENABLE		0x00
-#define INTC_REG_STATUS		0x04
-
-#define MAX_WORDS		2
-#define IRQS_PER_WORD		32
-
-struct bcm3384_intc {
-	int			n_words;
-	void __iomem		*reg[MAX_WORDS];
-	u32			enable[MAX_WORDS];
-	spinlock_t		lock;
-};
-
-static void bcm3384_intc_irq_unmask(struct irq_data *d)
-{
-	struct bcm3384_intc *priv = d->domain->host_data;
-	unsigned long flags;
-	int idx = d->hwirq / IRQS_PER_WORD;
-	int bit = d->hwirq % IRQS_PER_WORD;
-
-	spin_lock_irqsave(&priv->lock, flags);
-	priv->enable[idx] |= BIT(bit);
-	__raw_writel(priv->enable[idx], priv->reg[idx] + INTC_REG_ENABLE);
-	spin_unlock_irqrestore(&priv->lock, flags);
-}
-
-static void bcm3384_intc_irq_mask(struct irq_data *d)
-{
-	struct bcm3384_intc *priv = d->domain->host_data;
-	unsigned long flags;
-	int idx = d->hwirq / IRQS_PER_WORD;
-	int bit = d->hwirq % IRQS_PER_WORD;
-
-	spin_lock_irqsave(&priv->lock, flags);
-	priv->enable[idx] &= ~BIT(bit);
-	__raw_writel(priv->enable[idx], priv->reg[idx] + INTC_REG_ENABLE);
-	spin_unlock_irqrestore(&priv->lock, flags);
-}
-
-static struct irq_chip bcm3384_intc_irq_chip = {
-	.name		= "INTC",
-	.irq_unmask	= bcm3384_intc_irq_unmask,
-	.irq_mask	= bcm3384_intc_irq_mask,
-	.irq_mask_ack	= bcm3384_intc_irq_mask,
-};
+#include <asm/time.h>
 
 unsigned int get_c0_compare_int(void)
 {
 	return CP0_LEGACY_COMPARE_IRQ;
 }
 
-static void bcm3384_intc_irq_handler(unsigned int irq, struct irq_desc *desc)
-{
-	struct irq_domain *domain = irq_get_handler_data(irq);
-	struct bcm3384_intc *priv = domain->host_data;
-	unsigned long flags;
-	unsigned int idx;
-
-	for (idx = 0; idx < priv->n_words; idx++) {
-		unsigned long pending;
-		int hwirq;
-
-		spin_lock_irqsave(&priv->lock, flags);
-		pending = __raw_readl(priv->reg[idx] + INTC_REG_STATUS) &
-			  priv->enable[idx];
-		spin_unlock_irqrestore(&priv->lock, flags);
-
-		for_each_set_bit(hwirq, &pending, IRQS_PER_WORD) {
-			generic_handle_irq(irq_find_mapping(domain,
-					   hwirq + idx * IRQS_PER_WORD));
-		}
-	}
-}
-
-asmlinkage void plat_irq_dispatch(void)
-{
-	unsigned long pending =
-		(read_c0_status() & read_c0_cause() & ST0_IM) >> STATUSB_IP0;
-	int bit;
-
-	for_each_set_bit(bit, &pending, 8)
-		do_IRQ(MIPS_CPU_IRQ_BASE + bit);
-}
-
-static int intc_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
-{
-	irq_set_chip_and_handler(irq, &bcm3384_intc_irq_chip, handle_level_irq);
-	return 0;
-}
-
-static const struct irq_domain_ops irq_domain_ops = {
-	.xlate = irq_domain_xlate_onecell,
-	.map = intc_map,
-};
-
-static int __init ioremap_one_pair(struct bcm3384_intc *priv,
-				   struct device_node *node,
-				   int idx)
-{
-	struct resource res;
-
-	if (of_address_to_resource(node, idx, &res))
-		return 0;
-
-	if (request_mem_region(res.start, resource_size(&res),
-			       res.name) < 0)
-		pr_err("Failed to request INTC register region\n");
-
-	priv->reg[idx] = ioremap_nocache(res.start, resource_size(&res));
-	if (!priv->reg[idx])
-		panic("Failed to ioremap INTC register range");
-
-	/* start up with everything masked before we hook the parent IRQ */
-	__raw_writel(0, priv->reg[idx] + INTC_REG_ENABLE);
-	priv->enable[idx] = 0;
-
-	return IRQS_PER_WORD;
-}
-
-static int __init intc_of_init(struct device_node *node,
-			       struct device_node *parent)
+void __init arch_init_irq(void)
 {
-	struct irq_domain *domain;
-	unsigned int parent_irq, n_irqs = 0;
-	struct bcm3384_intc *priv;
-
-	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
-	if (!priv)
-		panic("Failed to allocate bcm3384_intc struct");
-
-	spin_lock_init(&priv->lock);
-
-	parent_irq = irq_of_parse_and_map(node, 0);
-	if (!parent_irq)
-		panic("Failed to get INTC IRQ");
-
-	n_irqs += ioremap_one_pair(priv, node, 0);
-	n_irqs += ioremap_one_pair(priv, node, 1);
-
-	if (!n_irqs)
-		panic("Failed to map INTC registers");
+	struct device_node *dn;
 
-	priv->n_words = n_irqs / IRQS_PER_WORD;
-	domain = irq_domain_add_linear(node, n_irqs, &irq_domain_ops, priv);
-	if (!domain)
-		panic("Failed to add irqdomain");
+	/* Only the STB (bcm7038) controller supports SMP IRQ affinity */
+	dn = of_find_compatible_node(NULL, NULL, "brcm,bcm7038-l1-intc");
+	if (dn)
+		of_node_put(dn);
+	else
+		bmips_tp1_irqs = 0;
 
-	irq_set_chained_handler(parent_irq, bcm3384_intc_irq_handler);
-	irq_set_handler_data(parent_irq, domain);
-
-	return 0;
+	irqchip_init();
 }
 
-static struct of_device_id of_irq_ids[] __initdata = {
-	{ .compatible = "mti,cpu-interrupt-controller",
-	  .data = mips_cpu_irq_of_init },
-	{ .compatible = "brcm,bcm3384-intc",
-	  .data = intc_of_init },
-	{},
-};
-
-void __init arch_init_irq(void)
-{
-	bmips_tp1_irqs = 0;
-	of_irq_init(of_irq_ids);
-}
+OF_DECLARE_2(irqchip, mips_cpu_intc, "mti,cpu-interrupt-controller",
+	     mips_cpu_irq_of_init);