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-rw-r--r--arch/powerpc/include/asm/mpic_msgr.h134
1 files changed, 134 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/mpic_msgr.h b/arch/powerpc/include/asm/mpic_msgr.h
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+++ b/arch/powerpc/include/asm/mpic_msgr.h
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+/*
+ * Copyright 2011-2012, Meador Inge, Mentor Graphics Corporation.
+ *
+ * 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; version 2 of the
+ * License.
+ *
+ */
+
+#ifndef _ASM_MPIC_MSGR_H
+#define _ASM_MPIC_MSGR_H
+
+#include <linux/types.h>
+#include <linux/spinlock.h>
+#include <asm/smp.h>
+#include <asm/io.h>
+
+struct mpic_msgr {
+ u32 __iomem *base;
+ u32 __iomem *mer;
+ int irq;
+ unsigned char in_use;
+ raw_spinlock_t lock;
+ int num;
+};
+
+/* Get a message register
+ *
+ * @reg_num: the MPIC message register to get
+ *
+ * A pointer to the message register is returned. If
+ * the message register asked for is already in use, then
+ * EBUSY is returned. If the number given is not associated
+ * with an actual message register, then ENODEV is returned.
+ * Successfully getting the register marks it as in use.
+ */
+extern struct mpic_msgr *mpic_msgr_get(unsigned int reg_num);
+
+/* Relinquish a message register
+ *
+ * @msgr: the message register to return
+ *
+ * Disables the given message register and marks it as free.
+ * After this call has completed successully the message
+ * register is available to be acquired by a call to
+ * mpic_msgr_get.
+ */
+extern void mpic_msgr_put(struct mpic_msgr *msgr);
+
+/* Enable a message register
+ *
+ * @msgr: the message register to enable
+ *
+ * The given message register is enabled for sending
+ * messages.
+ */
+extern void mpic_msgr_enable(struct mpic_msgr *msgr);
+
+/* Disable a message register
+ *
+ * @msgr: the message register to disable
+ *
+ * The given message register is disabled for sending
+ * messages.
+ */
+extern void mpic_msgr_disable(struct mpic_msgr *msgr);
+
+/* Write a message to a message register
+ *
+ * @msgr: the message register to write to
+ * @message: the message to write
+ *
+ * The given 32-bit message is written to the given message
+ * register. Writing to an enabled message registers fires
+ * an interrupt.
+ */
+static inline void mpic_msgr_write(struct mpic_msgr *msgr, u32 message)
+{
+ out_be32(msgr->base, message);
+}
+
+/* Read a message from a message register
+ *
+ * @msgr: the message register to read from
+ *
+ * Returns the 32-bit value currently in the given message register.
+ * Upon reading the register any interrupts for that register are
+ * cleared.
+ */
+static inline u32 mpic_msgr_read(struct mpic_msgr *msgr)
+{
+ return in_be32(msgr->base);
+}
+
+/* Clear a message register
+ *
+ * @msgr: the message register to clear
+ *
+ * Clears any interrupts associated with the given message register.
+ */
+static inline void mpic_msgr_clear(struct mpic_msgr *msgr)
+{
+ (void) mpic_msgr_read(msgr);
+}
+
+/* Set the destination CPU for the message register
+ *
+ * @msgr: the message register whose destination is to be set
+ * @cpu_num: the Linux CPU number to bind the message register to
+ *
+ * Note that the CPU number given is the CPU number used by the kernel
+ * and *not* the actual hardware CPU number.
+ */
+static inline void mpic_msgr_set_destination(struct mpic_msgr *msgr,
+ u32 cpu_num)
+{
+ out_be32(msgr->base, 1 << get_hard_smp_processor_id(cpu_num));
+}
+
+/* Get the IRQ number for the message register
+ * @msgr: the message register whose IRQ is to be returned
+ *
+ * Returns the IRQ number associated with the given message register.
+ * NO_IRQ is returned if this message register is not capable of
+ * receiving interrupts. What message register can and cannot receive
+ * interrupts is specified in the device tree for the system.
+ */
+static inline int mpic_msgr_get_irq(struct mpic_msgr *msgr)
+{
+ return msgr->irq;
+}
+
+#endif