[POWERPC] Use the genirq framework

This adapts the generic powerpc interrupt handling code, and all of
the platforms except for the embedded 6xx machines, to use the new
genirq framework.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

1 files changed, 76 insertions, 97 deletions

diff --git a/arch/powerpc/platforms/cell/spider-pic.c b/arch/powerpc/platforms/cell/spider-pic.c
index 7c3a0b6d34fd..98425acb6cda 100644
--- a/arch/powerpc/platforms/cell/spider-pic.c
+++ b/arch/powerpc/platforms/cell/spider-pic.c
@@ -82,17 +82,20 @@ static void __iomem *spider_get_irq_config(int irq)
 	return pic + TIR_CFGA + 8 * spider_get_nr(irq);
 }
 
-static void spider_enable_irq(unsigned int irq)
+static void spider_unmask_irq(unsigned int irq)
 {
 	int nodeid = (irq / IIC_NODE_STRIDE) * 0x10;
 	void __iomem *cfg = spider_get_irq_config(irq);
 	irq = spider_get_nr(irq);
 
+	/* FIXME: Most of that is configuration and has nothing to do with enabling/disable,
+	 * besides, it's also partially bogus.
+	 */
 	out_be32(cfg, (in_be32(cfg) & ~0xf0)| 0x3107000eu | nodeid);
 	out_be32(cfg + 4, in_be32(cfg + 4) | 0x00020000u | irq);
 }
 
-static void spider_disable_irq(unsigned int irq)
+static void spider_mask_irq(unsigned int irq)
 {
 	void __iomem *cfg = spider_get_irq_config(irq);
 	irq = spider_get_nr(irq);
@@ -100,39 +103,21 @@ static void spider_disable_irq(unsigned int irq)
 	out_be32(cfg, in_be32(cfg) & ~0x30000000u);
 }
 
-static unsigned int spider_startup_irq(unsigned int irq)
-{
-	spider_enable_irq(irq);
-	return 0;
-}
-
-static void spider_shutdown_irq(unsigned int irq)
-{
-	spider_disable_irq(irq);
-}
-
-static void spider_end_irq(unsigned int irq)
-{
-	spider_enable_irq(irq);
-}
-
 static void spider_ack_irq(unsigned int irq)
 {
-	spider_disable_irq(irq);
-	iic_local_enable();
+	/* Should reset edge detection logic but we don't configure any edge interrupt
+	 * at the moment.
+	 */
 }
 
-static struct hw_interrupt_type spider_pic = {
+static struct irq_chip spider_pic = {
 	.typename = " SPIDER   ",
-	.startup = spider_startup_irq,
-	.shutdown = spider_shutdown_irq,
-	.enable = spider_enable_irq,
-	.disable = spider_disable_irq,
+	.unmask = spider_unmask_irq,
+	.mask = spider_mask_irq,
 	.ack = spider_ack_irq,
-	.end = spider_end_irq,
 };
 
-int spider_get_irq(int node)
+static int spider_get_irq(int node)
 {
 	unsigned long cs;
 	void __iomem *regs = spider_pics[node];
@@ -145,95 +130,89 @@ int spider_get_irq(int node)
 		return cs;
 }
 
+static void spider_irq_cascade(unsigned int irq, struct irq_desc *desc,
+			       struct pt_regs *regs)
+{
+	int node = (int)(long)desc->handler_data;
+	int cascade_irq;
+
+	cascade_irq = spider_get_irq(node);
+	generic_handle_irq(cascade_irq, regs);
+	desc->chip->eoi(irq);
+}
+
 /* hardcoded part to be compatible with older firmware */
 
-void spider_init_IRQ_hardcoded(void)
+static void __init spider_init_one(int node, unsigned long addr)
 {
-	int node;
-	long spiderpic;
-	long pics[] = { 0x24000008000, 0x34000008000 };
-	int n;
-
-	pr_debug("%s(%d): Using hardcoded defaults\n", __FUNCTION__, __LINE__);
-
-	for (node = 0; node < num_present_cpus()/2; node++) {
-		spiderpic = pics[node];
-		printk(KERN_DEBUG "SPIDER addr: %lx\n", spiderpic);
-		spider_pics[node] = ioremap(spiderpic, 0x800);
-		for (n = 0; n < IIC_NUM_EXT; n++) {
-			int irq = n + IIC_EXT_OFFSET + node * IIC_NODE_STRIDE;
-			get_irq_desc(irq)->chip = &spider_pic;
-		}
-
- 		/* do not mask any interrupts because of level */
- 		out_be32(spider_pics[node] + TIR_MSK, 0x0);
-
- 		/* disable edge detection clear */
- 		/* out_be32(spider_pics[node] + TIR_EDC, 0x0); */
-
- 		/* enable interrupt packets to be output */
- 		out_be32(spider_pics[node] + TIR_PIEN,
-			in_be32(spider_pics[node] + TIR_PIEN) | 0x1);
-
- 		/* Enable the interrupt detection enable bit. Do this last! */
- 		out_be32(spider_pics[node] + TIR_DEN,
-			in_be32(spider_pics[node] + TIR_DEN) | 0x1);
+	int n, irq;
+
+	spider_pics[node] = ioremap(addr, 0x800);
+	if (spider_pics[node] == NULL)
+		panic("spider_pic: can't map registers !");
+
+	printk(KERN_INFO "spider_pic: mapped for node %d, addr: 0x%lx mapped to %p\n",
+	       node, addr, spider_pics[node]);
+
+	for (n = 0; n < IIC_NUM_EXT; n++) {
+		if (n == IIC_EXT_CASCADE)
+			continue;
+		irq = n + IIC_EXT_OFFSET + node * IIC_NODE_STRIDE;
+		set_irq_chip_and_handler(irq, &spider_pic, handle_level_irq);
+		get_irq_desc(irq)->status |= IRQ_LEVEL;
 	}
+
+	/* do not mask any interrupts because of level */
+	out_be32(spider_pics[node] + TIR_MSK, 0x0);
+
+	/* disable edge detection clear */
+	/* out_be32(spider_pics[node] + TIR_EDC, 0x0); */
+
+	/* enable interrupt packets to be output */
+	out_be32(spider_pics[node] + TIR_PIEN,
+		 in_be32(spider_pics[node] + TIR_PIEN) | 0x1);
+
+	/* Hook up cascade */
+	irq = IIC_EXT_CASCADE + node * IIC_NODE_STRIDE;
+	set_irq_data(irq, (void *)(long)node);
+	set_irq_chained_handler(irq, spider_irq_cascade);
+
+	/* Enable the interrupt detection enable bit. Do this last! */
+	out_be32(spider_pics[node] + TIR_DEN,
+		 in_be32(spider_pics[node] + TIR_DEN) | 0x1);
 }
 
-void spider_init_IRQ(void)
+void __init spider_init_IRQ(void)
 {
-	long spider_reg;
+	unsigned long *spider_reg;
 	struct device_node *dn;
 	char *compatible;
-	int n, node = 0;
-
+	int node = 0;
+
+	/* XXX node numbers are totally bogus. We _hope_ we get the device nodes in the right
+	 * order here but that's definitely not guaranteed, we need to get the node from the
+	 * device tree instead. There is currently no proper property for it (but our whole
+	 * device-tree is bogus anyway) so all we can do is pray or maybe test the address
+	 * and deduce the node-id
+	 */
 	for (dn = NULL; (dn = of_find_node_by_name(dn, "interrupt-controller"));) {
 		compatible = (char *)get_property(dn, "compatible", NULL);
 
 		if (!compatible)
 			continue;
 
-		if (strstr(compatible, "CBEA,platform-spider-pic"))
-			spider_reg = *(long *)get_property(dn,"reg", NULL);
-		else if (strstr(compatible, "sti,platform-spider-pic")) {
-			spider_init_IRQ_hardcoded();
-			return;
+ 		if (strstr(compatible, "CBEA,platform-spider-pic"))
+			spider_reg = (unsigned long *)get_property(dn, "reg", NULL);
+		else if (strstr(compatible, "sti,platform-spider-pic") && (node < 2)) {
+			static long hard_coded_pics[] = { 0x24000008000, 0x34000008000 };
+			spider_reg = &hard_coded_pics[node];
 		} else
 			continue;
 
-		if (!spider_reg)
-			printk("interrupt controller does not have reg property !\n");
-
-		n = prom_n_addr_cells(dn);
-
-		if ( n != 2)
-			printk("reg property with invalid number of elements \n");
-
-		spider_pics[node] = ioremap(spider_reg, 0x800);
-
-		printk("SPIDER addr: %lx with %i addr_cells mapped to %p\n",
-		       spider_reg, n, spider_pics[node]);
-
-		for (n = 0; n < IIC_NUM_EXT; n++) {
-			int irq = n + IIC_EXT_OFFSET + node * IIC_NODE_STRIDE;
-			get_irq_desc(irq)->chip = &spider_pic;
-		}
-
-		/* do not mask any interrupts because of level */
-		out_be32(spider_pics[node] + TIR_MSK, 0x0);
-
-		/* disable edge detection clear */
-		/* out_be32(spider_pics[node] + TIR_EDC, 0x0); */
-
-		/* enable interrupt packets to be output */
-		out_be32(spider_pics[node] + TIR_PIEN,
-			in_be32(spider_pics[node] + TIR_PIEN) | 0x1);
-
-		/* Enable the interrupt detection enable bit. Do this last! */
-		out_be32(spider_pics[node] + TIR_DEN,
-			in_be32(spider_pics[node] + TIR_DEN) | 0x1);
+		if (spider_reg == NULL)
+			printk(KERN_ERR "spider_pic: No address for node %d\n", node);
 
+		spider_init_one(node, *spider_reg);
 		node++;
 	}
 }