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>

1 files changed, 17 insertions, 172 deletions

diff --git a/arch/mips/bmips/irq.c b/arch/mips/bmips/irq.c
index fd94fe849af6..14552e58ff7e 100644
--- a/arch/mips/bmips/irq.c
+++ b/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);