1 files changed, 130 insertions, 0 deletions

diff --git a/arch/ppc/syslib/ppc8xx_pic.c b/arch/ppc/syslib/ppc8xx_pic.c
new file mode 100644
index 000000000000..d3b01c6c97de
--- /dev/null
+++ b/arch/ppc/syslib/ppc8xx_pic.c
@@ -0,0 +1,130 @@
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/stddef.h>
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/signal.h>
+#include <linux/interrupt.h>
+#include <asm/irq.h>
+#include <asm/8xx_immap.h>
+#include <asm/mpc8xx.h>
+#include "ppc8xx_pic.h"
+
+extern int cpm_get_irq(struct pt_regs *regs);
+
+/* The 8xx internal interrupt controller.  It is usually
+ * the only interrupt controller.  Some boards, like the MBX and
+ * Sandpoint have the 8259 as a secondary controller.  Depending
+ * upon the processor type, the internal controller can have as
+ * few as 16 interrups or as many as 64.  We could use  the
+ * "clear_bit()" and "set_bit()" functions like other platforms,
+ * but they are overkill for us.
+ */
+
+static void m8xx_mask_irq(unsigned int irq_nr)
+{
+        int     bit, word;
+
+        bit = irq_nr & 0x1f;
+        word = irq_nr >> 5;
+
+        ppc_cached_irq_mask[word] &= ~(1 << (31-bit));
+        ((immap_t *)IMAP_ADDR)->im_siu_conf.sc_simask =
+                                                ppc_cached_irq_mask[word];
+}
+
+static void m8xx_unmask_irq(unsigned int irq_nr)
+{
+        int     bit, word;
+
+        bit = irq_nr & 0x1f;
+        word = irq_nr >> 5;
+
+        ppc_cached_irq_mask[word] |= (1 << (31-bit));
+        ((immap_t *)IMAP_ADDR)->im_siu_conf.sc_simask =
+                                                ppc_cached_irq_mask[word];
+}
+
+static void m8xx_end_irq(unsigned int irq_nr)
+{
+        if (!(irq_desc[irq_nr].status & (IRQ_DISABLED|IRQ_INPROGRESS))
+                        && irq_desc[irq_nr].action) {
+                int bit, word;
+
+                bit = irq_nr & 0x1f;
+                word = irq_nr >> 5;
+
+                ppc_cached_irq_mask[word] |= (1 << (31-bit));
+                ((immap_t *)IMAP_ADDR)->im_siu_conf.sc_simask =
+                        ppc_cached_irq_mask[word];
+        }
+}
+
+
+static void m8xx_mask_and_ack(unsigned int irq_nr)
+{
+        int     bit, word;
+
+        bit = irq_nr & 0x1f;
+        word = irq_nr >> 5;
+
+        ppc_cached_irq_mask[word] &= ~(1 << (31-bit));
+        ((immap_t *)IMAP_ADDR)->im_siu_conf.sc_simask =
+                                                ppc_cached_irq_mask[word];
+        ((immap_t *)IMAP_ADDR)->im_siu_conf.sc_sipend = 1 << (31-bit);
+}
+
+struct hw_interrupt_type ppc8xx_pic = {
+        .typename = " 8xx SIU  ",
+        .enable = m8xx_unmask_irq,
+        .disable = m8xx_mask_irq,
+        .ack = m8xx_mask_and_ack,
+        .end = m8xx_end_irq,
+};
+
+/*
+ * We either return a valid interrupt or -1 if there is nothing pending
+ */
+int
+m8xx_get_irq(struct pt_regs *regs)
+{
+        int irq;
+
+        /* For MPC8xx, read the SIVEC register and shift the bits down
+         * to get the irq number.
+         */
+        irq = ((immap_t *)IMAP_ADDR)->im_siu_conf.sc_sivec >> 26;
+
+        /*
+         * When we read the sivec without an interrupt to process, we will
+         * get back SIU_LEVEL7.  In this case, return -1
+         */
+        if (irq == CPM_INTERRUPT)
+                irq = CPM_IRQ_OFFSET + cpm_get_irq(regs);
+#if defined(CONFIG_PCI)
+        else if (irq == ISA_BRIDGE_INT) {
+                int isa_irq;
+
+                if ((isa_irq = i8259_poll(regs)) >= 0)
+                        irq = I8259_IRQ_OFFSET + isa_irq;
+        }
+#endif  /* CONFIG_PCI */
+        else if (irq == SIU_LEVEL7)
+                irq = -1;
+
+        return irq;
+}
+
+#if defined(CONFIG_MBX) && defined(CONFIG_PCI)
+/* Only the MBX uses the external 8259.  This allows us to catch standard
+ * drivers that may mess up the internal interrupt controllers, and also
+ * allow them to run without modification on the MBX.
+ */
+void mbx_i8259_action(int irq, void *dev_id, struct pt_regs *regs)
+{
+        /* This interrupt handler never actually gets called.  It is
+         * installed only to unmask the 8259 cascade interrupt in the SIU
+         * and to make the 8259 cascade interrupt visible in /proc/interrupts.
+         */
+}
+#endif  /* CONFIG_PCI */