1 files changed, 262 insertions, 132 deletions

diff --git a/arch/powerpc/platforms/cell/spider-pic.c b/arch/powerpc/platforms/cell/spider-pic.c
index 7c3a0b6d34fd..ae7ef88f1a37 100644
--- a/arch/powerpc/platforms/cell/spider-pic.c
+++ b/arch/powerpc/platforms/cell/spider-pic.c
@@ -22,6 +22,7 @@
 
 #include <linux/interrupt.h>
 #include <linux/irq.h>
+#include <linux/ioport.h>
 
 #include <asm/pgtable.h>
 #include <asm/prom.h>
@@ -56,184 +57,313 @@ enum {
         REISWAITEN      = 0x508, /* Reissue Wait Control*/
 };
 
-static void __iomem *spider_pics[4];
+#define SPIDER_CHIP_COUNT       4
+#define SPIDER_SRC_COUNT        64
+#define SPIDER_IRQ_INVALID      63
 
-static void __iomem *spider_get_pic(int irq)
-{
-        int node = irq / IIC_NODE_STRIDE;
-        irq %= IIC_NODE_STRIDE;
-
-        if (irq >= IIC_EXT_OFFSET &&
-            irq < IIC_EXT_OFFSET + IIC_NUM_EXT &&
-            spider_pics)
-                return spider_pics[node];
-        return NULL;
-}
+struct spider_pic {
+        struct irq_host         *host;
+        struct device_node      *of_node;
+        void __iomem            *regs;
+        unsigned int            node_id;
+};
+static struct spider_pic spider_pics[SPIDER_CHIP_COUNT];
 
-static int spider_get_nr(unsigned int irq)
+static struct spider_pic *spider_virq_to_pic(unsigned int virq)
 {
-        return (irq % IIC_NODE_STRIDE) - IIC_EXT_OFFSET;
+        return irq_map[virq].host->host_data;
 }
 
-static void __iomem *spider_get_irq_config(int irq)
+static void __iomem *spider_get_irq_config(struct spider_pic *pic,
+                                           unsigned int src)
 {
-        void __iomem *pic;
-        pic = spider_get_pic(irq);
-        return pic + TIR_CFGA + 8 * spider_get_nr(irq);
+        return pic->regs + TIR_CFGA + 8 * src;
 }
 
-static void spider_enable_irq(unsigned int irq)
+static void spider_unmask_irq(unsigned int virq)
 {
-        int nodeid = (irq / IIC_NODE_STRIDE) * 0x10;
-        void __iomem *cfg = spider_get_irq_config(irq);
-        irq = spider_get_nr(irq);
+        struct spider_pic *pic = spider_virq_to_pic(virq);
+        void __iomem *cfg = spider_get_irq_config(pic, irq_map[virq].hwirq);
 
-        out_be32(cfg, (in_be32(cfg) & ~0xf0)| 0x3107000eu | nodeid);
-        out_be32(cfg + 4, in_be32(cfg + 4) | 0x00020000u | irq);
+        /* We use no locking as we should be covered by the descriptor lock
+         * for access to invidual source configuration registers
+         */
+        out_be32(cfg, in_be32(cfg) | 0x30000000u);
 }
 
-static void spider_disable_irq(unsigned int irq)
+static void spider_mask_irq(unsigned int virq)
 {
-        void __iomem *cfg = spider_get_irq_config(irq);
-        irq = spider_get_nr(irq);
+        struct spider_pic *pic = spider_virq_to_pic(virq);
+        void __iomem *cfg = spider_get_irq_config(pic, irq_map[virq].hwirq);
 
+        /* We use no locking as we should be covered by the descriptor lock
+         * for access to invidual source configuration registers
+         */
         out_be32(cfg, in_be32(cfg) & ~0x30000000u);
 }
 
-static unsigned int spider_startup_irq(unsigned int irq)
+static void spider_ack_irq(unsigned int virq)
 {
-        spider_enable_irq(irq);
-        return 0;
-}
+        struct spider_pic *pic = spider_virq_to_pic(virq);
+        unsigned int src = irq_map[virq].hwirq;
 
-static void spider_shutdown_irq(unsigned int irq)
-{
-        spider_disable_irq(irq);
-}
+        /* Reset edge detection logic if necessary
+         */
+        if (get_irq_desc(virq)->status & IRQ_LEVEL)
+                return;
 
-static void spider_end_irq(unsigned int irq)
-{
-        spider_enable_irq(irq);
-}
+        /* Only interrupts 47 to 50 can be set to edge */
+        if (src < 47 || src > 50)
+                return;
 
-static void spider_ack_irq(unsigned int irq)
-{
-        spider_disable_irq(irq);
-        iic_local_enable();
+        /* Perform the clear of the edge logic */
+        out_be32(pic->regs + TIR_EDC, 0x100 | (src & 0xf));
 }
 
-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_host_match(struct irq_host *h, struct device_node *node)
 {
-        unsigned long cs;
-        void __iomem *regs = spider_pics[node];
-
-        cs = in_be32(regs + TIR_CS) >> 24;
-
-        if (cs == 63)
-                return -1;
-        else
-                return cs;
+        struct spider_pic *pic = h->host_data;
+        return node == pic->of_node;
 }
 
-/* hardcoded part to be compatible with older firmware */
-
-void spider_init_IRQ_hardcoded(void)
+static int spider_host_map(struct irq_host *h, unsigned int virq,
+                        irq_hw_number_t hw, unsigned int flags)
 {
-        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);
+        unsigned int sense = flags & IRQ_TYPE_SENSE_MASK;
+        struct spider_pic *pic = h->host_data;
+        void __iomem *cfg = spider_get_irq_config(pic, hw);
+        int level = 0;
+        u32 ic;
+
+        /* Note that only level high is supported for most interrupts */
+        if (sense != IRQ_TYPE_NONE && sense != IRQ_TYPE_LEVEL_HIGH &&
+            (hw < 47 || hw > 50))
+                return -EINVAL;
+
+        /* Decode sense type */
+        switch(sense) {
+        case IRQ_TYPE_EDGE_RISING:
+                ic = 0x3;
+                break;
+        case IRQ_TYPE_EDGE_FALLING:
+                ic = 0x2;
+                break;
+        case IRQ_TYPE_LEVEL_LOW:
+                ic = 0x0;
+                level = 1;
+                break;
+        case IRQ_TYPE_LEVEL_HIGH:
+        case IRQ_TYPE_NONE:
+                ic = 0x1;
+                level = 1;
+                break;
+        default:
+                return -EINVAL;
         }
-}
 
-void spider_init_IRQ(void)
-{
-        long spider_reg;
-        struct device_node *dn;
-        char *compatible;
-        int n, node = 0;
+        /* Configure the source. One gross hack that was there before and
+         * that I've kept around is the priority to the BE which I set to
+         * be the same as the interrupt source number. I don't know wether
+         * that's supposed to make any kind of sense however, we'll have to
+         * decide that, but for now, I'm not changing the behaviour.
+         */
+        out_be32(cfg, (ic << 24) | (0x7 << 16) | (pic->node_id << 4) | 0xe);
+        out_be32(cfg + 4, (0x2 << 16) | (hw & 0xff));
+
+        if (level)
+                get_irq_desc(virq)->status |= IRQ_LEVEL;
+        set_irq_chip_and_handler(virq, &spider_pic, handle_level_irq);
+        return 0;
+}
 
-        for (dn = NULL; (dn = of_find_node_by_name(dn, "interrupt-controller"));) {
-                compatible = (char *)get_property(dn, "compatible", NULL);
+static int spider_host_xlate(struct irq_host *h, struct device_node *ct,
+                           u32 *intspec, unsigned int intsize,
+                           irq_hw_number_t *out_hwirq, unsigned int *out_flags)
 
-                if (!compatible)
-                        continue;
+{
+        /* Spider interrupts have 2 cells, first is the interrupt source,
+         * second, well, I don't know for sure yet ... We mask the top bits
+         * because old device-trees encode a node number in there
+         */
+        *out_hwirq = intspec[0] & 0x3f;
+        *out_flags = IRQ_TYPE_LEVEL_HIGH;
+        return 0;
+}
 
-                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;
-                } else
-                        continue;
+static struct irq_host_ops spider_host_ops = {
+        .match = spider_host_match,
+        .map = spider_host_map,
+        .xlate = spider_host_xlate,
+};
 
-                if (!spider_reg)
-                        printk("interrupt controller does not have reg property !\n");
+static void spider_irq_cascade(unsigned int irq, struct irq_desc *desc,
+                               struct pt_regs *regs)
+{
+        struct spider_pic *pic = desc->handler_data;
+        unsigned int cs, virq;
 
-                n = prom_n_addr_cells(dn);
+        cs = in_be32(pic->regs + TIR_CS) >> 24;
+        if (cs == SPIDER_IRQ_INVALID)
+                virq = NO_IRQ;
+        else
+                virq = irq_linear_revmap(pic->host, cs);
+        if (virq != NO_IRQ)
+                generic_handle_irq(virq, regs);
+        desc->chip->eoi(irq);
+}
 
-                if ( n != 2)
-                        printk("reg property with invalid number of elements \n");
+/* For hooking up the cascace we have a problem. Our device-tree is
+ * crap and we don't know on which BE iic interrupt we are hooked on at
+ * least not the "standard" way. We can reconstitute it based on two
+ * informations though: which BE node we are connected to and wether
+ * we are connected to IOIF0 or IOIF1. Right now, we really only care
+ * about the IBM cell blade and we know that its firmware gives us an
+ * interrupt-map property which is pretty strange.
+ */
+static unsigned int __init spider_find_cascade_and_node(struct spider_pic *pic)
+{
+        unsigned int virq;
+        u32 *imap, *tmp;
+        int imaplen, intsize, unit;
+        struct device_node *iic;
+        struct irq_host *iic_host;
+
+#if 0 /* Enable that when we have a way to retreive the node as well */
+        /* First, we check wether we have a real "interrupts" in the device
+         * tree in case the device-tree is ever fixed
+         */
+        struct of_irq oirq;
+        if (of_irq_map_one(pic->of_node, 0, &oirq) == 0) {
+                virq = irq_create_of_mapping(oirq.controller, oirq.specifier,
+                                             oirq.size);
+                goto bail;
+        }
+#endif
+
+        /* Now do the horrible hacks */
+        tmp = (u32 *)get_property(pic->of_node, "#interrupt-cells", NULL);
+        if (tmp == NULL)
+                return NO_IRQ;
+        intsize = *tmp;
+        imap = (u32 *)get_property(pic->of_node, "interrupt-map", &imaplen);
+        if (imap == NULL || imaplen < (intsize + 1))
+                return NO_IRQ;
+        iic = of_find_node_by_phandle(imap[intsize]);
+        if (iic == NULL)
+                return NO_IRQ;
+        imap += intsize + 1;
+        tmp = (u32 *)get_property(iic, "#interrupt-cells", NULL);
+        if (tmp == NULL)
+                return NO_IRQ;
+        intsize = *tmp;
+        /* Assume unit is last entry of interrupt specifier */
+        unit = imap[intsize - 1];
+        /* Ok, we have a unit, now let's try to get the node */
+        tmp = (u32 *)get_property(iic, "ibm,interrupt-server-ranges", NULL);
+        if (tmp == NULL) {
+                of_node_put(iic);
+                return NO_IRQ;
+        }
+        /* ugly as hell but works for now */
+        pic->node_id = (*tmp) >> 1;
+        of_node_put(iic);
+
+        /* Ok, now let's get cracking. You may ask me why I just didn't match
+         * the iic host from the iic OF node, but that way I'm still compatible
+         * with really really old old firmwares for which we don't have a node
+         */
+        iic_host = iic_get_irq_host(pic->node_id);
+        if (iic_host == NULL)
+                return NO_IRQ;
+        /* Manufacture an IIC interrupt number of class 2 */
+        virq = irq_create_mapping(iic_host, 0x20 | unit, 0);
+        if (virq == NO_IRQ)
+                printk(KERN_ERR "spider_pic: failed to map cascade !");
+        return virq;
+}
 
-                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]);
+static void __init spider_init_one(struct device_node *of_node, int chip,
+                                   unsigned long addr)
+{
+        struct spider_pic *pic = &spider_pics[chip];
+        int i, virq;
+
+        /* Map registers */
+        pic->regs = ioremap(addr, 0x1000);
+        if (pic->regs == NULL)
+                panic("spider_pic: can't map registers !");
+
+        /* Allocate a host */
+        pic->host = irq_alloc_host(IRQ_HOST_MAP_LINEAR, SPIDER_SRC_COUNT,
+                                   &spider_host_ops, SPIDER_IRQ_INVALID);
+        if (pic->host == NULL)
+                panic("spider_pic: can't allocate irq host !");
+        pic->host->host_data = pic;
+
+        /* Fill out other bits */
+        pic->of_node = of_node_get(of_node);
+
+        /* Go through all sources and disable them */
+        for (i = 0; i < SPIDER_SRC_COUNT; i++) {
+                void __iomem *cfg = pic->regs + TIR_CFGA + 8 * i;
+                out_be32(cfg, in_be32(cfg) & ~0x30000000u);
+        }
 
-                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(pic->regs + TIR_MSK, 0x0);
 
-                /* do not mask any interrupts because of level */
-                out_be32(spider_pics[node] + TIR_MSK, 0x0);
+        /* enable interrupt packets to be output */
+        out_be32(pic->regs + TIR_PIEN, in_be32(pic->regs + TIR_PIEN) | 0x1);
 
-                /* disable edge detection clear */
-                /* out_be32(spider_pics[node] + TIR_EDC, 0x0); */
+        /* Hook up the cascade interrupt to the iic and nodeid */
+        virq = spider_find_cascade_and_node(pic);
+        if (virq == NO_IRQ)
+                return;
+        set_irq_data(virq, pic);
+        set_irq_chained_handler(virq, spider_irq_cascade);
 
-                /* enable interrupt packets to be output */
-                out_be32(spider_pics[node] + TIR_PIEN,
-                        in_be32(spider_pics[node] + TIR_PIEN) | 0x1);
+        printk(KERN_INFO "spider_pic: node %d, addr: 0x%lx %s\n",
+               pic->node_id, addr, of_node->full_name);
 
-                /* Enable the interrupt detection enable bit. Do this last! */
-                out_be32(spider_pics[node] + TIR_DEN,
-                        in_be32(spider_pics[node] + TIR_DEN) | 0x1);
+        /* Enable the interrupt detection enable bit. Do this last! */
+        out_be32(pic->regs + TIR_DEN, in_be32(pic->regs + TIR_DEN) | 0x1);
+}
 
-                node++;
+void __init spider_init_IRQ(void)
+{
+        struct resource r;
+        struct device_node *dn;
+        int chip = 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"));) {
+                if (device_is_compatible(dn, "CBEA,platform-spider-pic")) {
+                        if (of_address_to_resource(dn, 0, &r)) {
+                                printk(KERN_WARNING "spider-pic: Failed\n");
+                                continue;
+                        }
+                } else if (device_is_compatible(dn, "sti,platform-spider-pic")
+                           && (chip < 2)) {
+                        static long hard_coded_pics[] =
+                                { 0x24000008000, 0x34000008000 };
+                        r.start = hard_coded_pics[chip];
+                } else
+                        continue;
+                spider_init_one(dn, chip++, r.start);
         }
 }