MIPS: Netlogic: Add basic MSI support for XLR/XLS

Add basic support for MSI.

Signed-off-by: Ganesan Ramalingam <ganesanr@netlogicmicro.com>
Signed-off-by: Jayachandran C <jayachandranc@netlogicmicro.com>
To: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/2730/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

4 files changed, 140 insertions, 1 deletions

diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index d46f1da18a3c..04ac89c6ab68 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -776,6 +776,7 @@ config NLM_XLR_BOARD
         select CEVT_R4K
         select CSRC_R4K
         select IRQ_CPU
+        select ARCH_SUPPORTS_MSI
         select ZONE_DMA if 64BIT
         select SYNC_R4K
         select SYS_HAS_EARLY_PRINTK
diff --git a/arch/mips/include/asm/netlogic/xlr/msidef.h b/arch/mips/include/asm/netlogic/xlr/msidef.h
new file mode 100644
index 000000000000..7e39d40be4f5
--- /dev/null
+++ b/arch/mips/include/asm/netlogic/xlr/msidef.h
@@ -0,0 +1,84 @@
+/*
+ * Copyright 2003-2011 NetLogic Microsystems, Inc. (NetLogic). All rights
+ * reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the NetLogic
+ * license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY NETLOGIC ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL NETLOGIC OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef ASM_RMI_MSIDEF_H
+#define ASM_RMI_MSIDEF_H
+
+/*
+ * Constants for Intel APIC based MSI messages.
+ * Adapted for the RMI XLR using identical defines
+ */
+
+/*
+ * Shifts for MSI data
+ */
+
+#define MSI_DATA_VECTOR_SHIFT           0
+#define  MSI_DATA_VECTOR_MASK           0x000000ff
+#define  MSI_DATA_VECTOR(v)             (((v) << MSI_DATA_VECTOR_SHIFT) & \
+                                                MSI_DATA_VECTOR_MASK)
+
+#define MSI_DATA_DELIVERY_MODE_SHIFT    8
+#define  MSI_DATA_DELIVERY_FIXED        (0 << MSI_DATA_DELIVERY_MODE_SHIFT)
+#define  MSI_DATA_DELIVERY_LOWPRI       (1 << MSI_DATA_DELIVERY_MODE_SHIFT)
+
+#define MSI_DATA_LEVEL_SHIFT            14
+#define  MSI_DATA_LEVEL_DEASSERT        (0 << MSI_DATA_LEVEL_SHIFT)
+#define  MSI_DATA_LEVEL_ASSERT          (1 << MSI_DATA_LEVEL_SHIFT)
+
+#define MSI_DATA_TRIGGER_SHIFT          15
+#define  MSI_DATA_TRIGGER_EDGE          (0 << MSI_DATA_TRIGGER_SHIFT)
+#define  MSI_DATA_TRIGGER_LEVEL         (1 << MSI_DATA_TRIGGER_SHIFT)
+
+/*
+ * Shift/mask fields for msi address
+ */
+
+#define MSI_ADDR_BASE_HI                0
+#define MSI_ADDR_BASE_LO                0xfee00000
+
+#define MSI_ADDR_DEST_MODE_SHIFT        2
+#define  MSI_ADDR_DEST_MODE_PHYSICAL    (0 << MSI_ADDR_DEST_MODE_SHIFT)
+#define  MSI_ADDR_DEST_MODE_LOGICAL     (1 << MSI_ADDR_DEST_MODE_SHIFT)
+
+#define MSI_ADDR_REDIRECTION_SHIFT      3
+#define  MSI_ADDR_REDIRECTION_CPU       (0 << MSI_ADDR_REDIRECTION_SHIFT)
+#define  MSI_ADDR_REDIRECTION_LOWPRI    (1 << MSI_ADDR_REDIRECTION_SHIFT)
+
+#define MSI_ADDR_DEST_ID_SHIFT          12
+#define  MSI_ADDR_DEST_ID_MASK          0x00ffff0
+#define  MSI_ADDR_DEST_ID(dest)         (((dest) << MSI_ADDR_DEST_ID_SHIFT) & \
+                                                 MSI_ADDR_DEST_ID_MASK)
+
+#endif /* ASM_RMI_MSIDEF_H */
diff --git a/arch/mips/netlogic/xlr/irq.c b/arch/mips/netlogic/xlr/irq.c
index 521bb7377eb0..fc822c8f0817 100644
--- a/arch/mips/netlogic/xlr/irq.c
+++ b/arch/mips/netlogic/xlr/irq.c
@@ -38,9 +38,14 @@
 #include <linux/interrupt.h>
 #include <linux/spinlock.h>
 #include <linux/mm.h>
+#include <linux/msi.h>
+#include <linux/irq.h>
+#include <linux/irqdesc.h>
+#include <linux/pci.h>
 
 #include <asm/mipsregs.h>
 
+#include <asm/netlogic/xlr/msidef.h>
 #include <asm/netlogic/xlr/iomap.h>
 #include <asm/netlogic/xlr/pic.h>
 #include <asm/netlogic/xlr/xlr.h>
diff --git a/arch/mips/pci/pci-xlr.c b/arch/mips/pci/pci-xlr.c
index 38fece16c435..87404d0034d2 100644
--- a/arch/mips/pci/pci-xlr.c
+++ b/arch/mips/pci/pci-xlr.c
@@ -36,12 +36,16 @@
 #include <linux/pci.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
+#include <linux/msi.h>
 #include <linux/mm.h>
+#include <linux/irq.h>
+#include <linux/irqdesc.h>
 #include <linux/console.h>
 
 #include <asm/io.h>
 
 #include <asm/netlogic/interrupt.h>
+#include <asm/netlogic/xlr/msidef.h>
 #include <asm/netlogic/xlr/iomap.h>
 #include <asm/netlogic/xlr/pic.h>
 #include <asm/netlogic/xlr/xlr.h>
@@ -150,7 +154,7 @@ struct pci_controller nlm_pci_controller = {
         .io_offset      = 0x00000000UL,
 };
 
-int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+static int get_irq_vector(const struct pci_dev *dev)
 {
         if (!nlm_chip_is_xls())
                 return  PIC_PCIX_IRQ;   /* for XLR just one IRQ*/
@@ -182,6 +186,51 @@ int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
         return 0;
 }
 
+#ifdef CONFIG_PCI_MSI
+void destroy_irq(unsigned int irq)
+{
+            /* nothing to do yet */
+}
+
+void arch_teardown_msi_irq(unsigned int irq)
+{
+        destroy_irq(irq);
+}
+
+int arch_setup_msi_irq(struct pci_dev *dev, struct msi_desc *desc)
+{
+        struct msi_msg msg;
+        int irq, ret;
+
+        irq = get_irq_vector(dev);
+        if (irq <= 0)
+                return 1;
+
+        msg.address_hi = MSI_ADDR_BASE_HI;
+        msg.address_lo = MSI_ADDR_BASE_LO   |
+                MSI_ADDR_DEST_MODE_PHYSICAL |
+                MSI_ADDR_REDIRECTION_CPU;
+
+        msg.data = MSI_DATA_TRIGGER_EDGE |
+                MSI_DATA_LEVEL_ASSERT    |
+                MSI_DATA_DELIVERY_FIXED;
+
+        ret = irq_set_msi_desc(irq, desc);
+        if (ret < 0) {
+                destroy_irq(irq);
+                return ret;
+        }
+
+        write_msi_msg(irq, &msg);
+        return 0;
+}
+#endif
+
+int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
+{
+        return get_irq_vector(dev);
+}
+
 /* Do platform specific device initialization at pci_enable_device() time */
 int pcibios_plat_dev_init(struct pci_dev *dev)
 {