MIPS: MSP71xx: Add vectored interrupt support.

This patch will add vectored interrupt setups required for MIPS MT modes.
irq_cic has been restructured and moved per irq handler to different file.
irq_cic has been re wrote to support mips MT modes ( VSMP / SMTC )

[Ralf: fixed some more checkpatch warnings.]

Signed-off-by: Anoop P A <anoop.pa@gmail.com>
To: linux-mips@linux-mips.org
To: linux-kernel@vger.kernel.org
To: dhowells@redhat.com
Patchwork: https://patchwork.linux-mips.org/patch/2041/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/pmc-sierra/msp71xx/Makefile

@@ -6,7 +6,7 @@ obj-y += msp_prom.o msp_setup.o msp_irq.o \
 obj-$(CONFIG_HAVE_GPIO_LIB) += gpio.o gpio_extended.o
 obj-$(CONFIG_PMC_MSP7120_GW) += msp_hwbutton.o
 obj-$(CONFIG_IRQ_MSP_SLP) += msp_irq_slp.o
-obj-$(CONFIG_IRQ_MSP_CIC) += msp_irq_cic.o
+obj-$(CONFIG_IRQ_MSP_CIC) += msp_irq_cic.o msp_irq_per.o
 obj-$(CONFIG_PCI) += msp_pci.o
 obj-$(CONFIG_MSPETH) += msp_eth.o
 obj-$(CONFIG_USB_MSP71XX) += msp_usb.o

arch/mips/pmc-sierra/msp71xx/msp_irq.c

@@ -19,8 +19,6 @@
 
 #include <msp_int.h>
 
-extern void msp_int_handle(void);
-
 /* SLP bases systems */
 extern void msp_slp_irq_init(void);
 extern void msp_slp_irq_dispatch(void);
@@ -29,6 +27,18 @@ extern void msp_slp_irq_dispatch(void);
 extern void msp_cic_irq_init(void);
 extern void msp_cic_irq_dispatch(void);
 
+/* VSMP support init */
+extern void msp_vsmp_int_init(void);
+
+/* vectored interrupt implementation */
+
+/* SW0/1 interrupts are used for SMP/SMTC */
+static inline void mac0_int_dispatch(void) { do_IRQ(MSP_INT_MAC0); }
+static inline void mac1_int_dispatch(void) { do_IRQ(MSP_INT_MAC1); }
+static inline void mac2_int_dispatch(void) { do_IRQ(MSP_INT_SAR); }
+static inline void usb_int_dispatch(void)  { do_IRQ(MSP_INT_USB);  }
+static inline void sec_int_dispatch(void)  { do_IRQ(MSP_INT_SEC);  }
+
 /*
  * The PMC-Sierra MSP interrupts are arranged in a 3 level cascaded
  * hierarchical system.  The first level are the direct MIPS interrupts
@@ -96,29 +106,57 @@ asmlinkage void plat_irq_dispatch(struct pt_regs *regs)
 		do_IRQ(MSP_INT_SW1);
 }
 
-static struct irqaction cascade_msp = {
+static struct irqaction cic_cascade_msp = {
 	.handler = no_action,
-	.name	 = "MSP cascade"
+	.name	 = "MSP CIC cascade"
 };
 
+static struct irqaction per_cascade_msp = {
+	.handler = no_action,
+	.name	 = "MSP PER cascade"
+};
 
 void __init arch_init_irq(void)
 {
+	/* assume we'll be using vectored interrupt mode except in UP mode*/
+#ifdef CONFIG_MIPS_MT
+	BUG_ON(!cpu_has_vint);
+#endif
 	/* initialize the 1st-level CPU based interrupt controller */
 	mips_cpu_irq_init();
 
 #ifdef CONFIG_IRQ_MSP_CIC
 	msp_cic_irq_init();
-
+#ifdef CONFIG_MIPS_MT
+	set_vi_handler(MSP_INT_CIC, msp_cic_irq_dispatch);
+	set_vi_handler(MSP_INT_MAC0, mac0_int_dispatch);
+	set_vi_handler(MSP_INT_MAC1, mac1_int_dispatch);
+	set_vi_handler(MSP_INT_SAR, mac2_int_dispatch);
+	set_vi_handler(MSP_INT_USB, usb_int_dispatch);
+	set_vi_handler(MSP_INT_SEC, sec_int_dispatch);
+#ifdef CONFIG_MIPS_MT_SMP
+	msp_vsmp_int_init();
+#elif defined CONFIG_MIPS_MT_SMTC
+	/*Set hwmask for all platform devices */
+	irq_hwmask[MSP_INT_MAC0] = C_IRQ0;
+	irq_hwmask[MSP_INT_MAC1] = C_IRQ1;
+	irq_hwmask[MSP_INT_USB] = C_IRQ2;
+	irq_hwmask[MSP_INT_SAR] = C_IRQ3;
+	irq_hwmask[MSP_INT_SEC] = C_IRQ5;
+
+#endif	/* CONFIG_MIPS_MT_SMP */
+#endif	/* CONFIG_MIPS_MT */
 	/* setup the cascaded interrupts */
-	setup_irq(MSP_INT_CIC, &cascade_msp);
-	setup_irq(MSP_INT_PER, &cascade_msp);
+	setup_irq(MSP_INT_CIC, &cic_cascade_msp);
+	setup_irq(MSP_INT_PER, &per_cascade_msp);
+
 #else
 	/* setup the 2nd-level SLP register based interrupt controller */
+	/* VSMP /SMTC support support is not enabled for SLP */
 	msp_slp_irq_init();
 
 	/* setup the cascaded SLP/PER interrupts */
-	setup_irq(MSP_INT_SLP, &cascade_msp);
-	setup_irq(MSP_INT_PER, &cascade_msp);
+	setup_irq(MSP_INT_SLP, &cic_cascade_msp);
+	setup_irq(MSP_INT_PER, &per_cascade_msp);
 #endif
 }