1 files changed, 191 insertions, 0 deletions

diff --git a/arch/ppc64/kernel/spider-pic.c b/arch/ppc64/kernel/spider-pic.c
new file mode 100644
index 000000000000..d5c9a02fb119
--- /dev/null
+++ b/arch/ppc64/kernel/spider-pic.c
@@ -0,0 +1,191 @@
+/*
+ * External Interrupt Controller on Spider South Bridge
+ *
+ * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
+ *
+ * Author: Arnd Bergmann <arndb@de.ibm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+
+#include <asm/pgtable.h>
+#include <asm/prom.h>
+#include <asm/io.h>
+
+#include "bpa_iic.h"
+
+/* register layout taken from Spider spec, table 7.4-4 */
+enum {
+        TIR_DEN         = 0x004, /* Detection Enable Register */
+        TIR_MSK         = 0x084, /* Mask Level Register */
+        TIR_EDC         = 0x0c0, /* Edge Detection Clear Register */
+        TIR_PNDA        = 0x100, /* Pending Register A */
+        TIR_PNDB        = 0x104, /* Pending Register B */
+        TIR_CS          = 0x144, /* Current Status Register */
+        TIR_LCSA        = 0x150, /* Level Current Status Register A */
+        TIR_LCSB        = 0x154, /* Level Current Status Register B */
+        TIR_LCSC        = 0x158, /* Level Current Status Register C */
+        TIR_LCSD        = 0x15c, /* Level Current Status Register D */
+        TIR_CFGA        = 0x200, /* Setting Register A0 */
+        TIR_CFGB        = 0x204, /* Setting Register B0 */
+                        /* 0x208 ... 0x3ff Setting Register An/Bn */
+        TIR_PPNDA       = 0x400, /* Packet Pending Register A */
+        TIR_PPNDB       = 0x404, /* Packet Pending Register B */
+        TIR_PIERA       = 0x408, /* Packet Output Error Register A */
+        TIR_PIERB       = 0x40c, /* Packet Output Error Register B */
+        TIR_PIEN        = 0x444, /* Packet Output Enable Register */
+        TIR_PIPND       = 0x454, /* Packet Output Pending Register */
+        TIRDID          = 0x484, /* Spider Device ID Register */
+        REISTIM         = 0x500, /* Reissue Command Timeout Time Setting */
+        REISTIMEN       = 0x504, /* Reissue Command Timeout Setting */
+        REISWAITEN      = 0x508, /* Reissue Wait Control*/
+};
+
+static void __iomem *spider_pics[4];
+
+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;
+}
+
+static int spider_get_nr(unsigned int irq)
+{
+        return (irq % IIC_NODE_STRIDE) - IIC_EXT_OFFSET;
+}
+
+static void __iomem *spider_get_irq_config(int irq)
+{
+        void __iomem *pic;
+        pic = spider_get_pic(irq);
+        return pic + TIR_CFGA + 8 * spider_get_nr(irq);
+}
+
+static void spider_enable_irq(unsigned int irq)
+{
+        void __iomem *cfg = spider_get_irq_config(irq);
+        irq = spider_get_nr(irq);
+
+        out_be32(cfg, in_be32(cfg) | 0x3107000eu);
+        out_be32(cfg + 4, in_be32(cfg + 4) | 0x00020000u | irq);
+}
+
+static void spider_disable_irq(unsigned int irq)
+{
+        void __iomem *cfg = spider_get_irq_config(irq);
+        irq = spider_get_nr(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();
+}
+
+static struct hw_interrupt_type spider_pic = {
+        .typename = " SPIDER   ",
+        .startup = spider_startup_irq,
+        .shutdown = spider_shutdown_irq,
+        .enable = spider_enable_irq,
+        .disable = spider_disable_irq,
+        .ack = spider_ack_irq,
+        .end = spider_end_irq,
+};
+
+
+int spider_get_irq(unsigned long int_pending)
+{
+        void __iomem *regs = spider_get_pic(int_pending);
+        unsigned long cs;
+        int irq;
+
+        cs = in_be32(regs + TIR_CS);
+
+        irq = cs >> 24;
+        if (irq != 63)
+                return irq;
+
+        return -1;
+}
+ 
+void spider_init_IRQ(void)
+{
+        int node;
+        struct device_node *dn;
+        unsigned int *property;
+        long spiderpic;
+        int n;
+
+/* FIXME: detect multiple PICs as soon as the device tree has them */
+        for (node = 0; node < 1; node++) {
+                dn = of_find_node_by_path("/");
+                n = prom_n_addr_cells(dn);
+                property = (unsigned int *) get_property(dn,
+                                "platform-spider-pic", NULL);
+
+                if (!property)
+                        continue;
+                for (spiderpic = 0; n > 0; --n)
+                        spiderpic = (spiderpic << 32) + *property++;
+                printk(KERN_DEBUG "SPIDER addr: %lx\n", spiderpic);
+                spider_pics[node] = __ioremap(spiderpic, 0x800, _PAGE_NO_CACHE);
+                for (n = 0; n < IIC_NUM_EXT; n++) {
+                        int irq = n + IIC_EXT_OFFSET + node * IIC_NODE_STRIDE;
+                        get_irq_desc(irq)->handler = &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);
+
+                }
+        }
+}