[RFC v4 3/3] vfio: platform: reset: add msi support

[Vikas Gupta]

Add msi support for Broadcom FlexRm device.

Signed-off-by: Vikas Gupta <vikas.gu...@broadcom.com>
---
 .../platform/reset/vfio_platform_bcmflexrm.c  | 72 ++++++++++++++++++-
 1 file changed, 70 insertions(+), 2 deletions(-)

diff --git a/drivers/vfio/platform/reset/vfio_platform_bcmflexrm.c 
b/drivers/vfio/platform/reset/vfio_platform_bcmflexrm.c
index 96064ef8f629..6ca4ca12575b 100644
--- a/drivers/vfio/platform/reset/vfio_platform_bcmflexrm.c
+++ b/drivers/vfio/platform/reset/vfio_platform_bcmflexrm.c
@@ -21,7 +21,9 @@
 #include <linux/init.h>
 #include <linux/io.h>
 #include <linux/kernel.h>
+#include <linux/msi.h>
 #include <linux/module.h>
+#include <linux/vfio.h>
 
 #include "../vfio_platform_private.h"
 
@@ -33,6 +35,9 @@
 #define RING_VER                                       0x000
 #define RING_CONTROL                                   0x034
 #define RING_FLUSH_DONE                                        0x038
+#define RING_MSI_ADDR_LS                               0x03c
+#define RING_MSI_ADDR_MS                               0x040
+#define RING_MSI_DATA_VALUE                            0x064
 
 /* Register RING_CONTROL fields */
 #define CONTROL_FLUSH_SHIFT                            5
@@ -105,8 +110,71 @@ static int vfio_platform_bcmflexrm_reset(struct 
vfio_platform_device *vdev)
        return ret;
 }
 
-module_vfio_reset_handler("brcm,iproc-flexrm-mbox",
-                         vfio_platform_bcmflexrm_reset);
+static u32 bcm_num_msi(struct vfio_platform_device *vdev)
+{
+       struct vfio_platform_region *reg = &vdev->regions[0];
+
+       return (reg->size / RING_REGS_SIZE);
+}
+
+static void bcm_write_msi(struct vfio_platform_device *vdev,
+               struct msi_desc *desc,
+               struct msi_msg *msg)
+{
+       int i;
+       int hwirq = -1;
+       int msi_src;
+       void __iomem *ring;
+       struct vfio_platform_region *reg = &vdev->regions[0];
+
+       if (!reg)
+               return;
+
+       for (i = 0; i < vdev->num_irqs; i++)
+               if (vdev->irqs[i].type == VFIO_IRQ_TYPE_MSI)
+                       hwirq = vdev->irqs[i].ctx[0].hwirq;
+
+       if (hwirq < 0)
+               return;
+
+       msi_src = desc->irq - hwirq;
+
+       if (!reg->ioaddr) {
+               reg->ioaddr = ioremap(reg->addr, reg->size);
+               if (!reg->ioaddr)
+                       return;
+       }
+
+       ring = reg->ioaddr + msi_src * RING_REGS_SIZE;
+
+       writel_relaxed(msg->address_lo, ring + RING_MSI_ADDR_LS);
+       writel_relaxed(msg->address_hi, ring + RING_MSI_ADDR_MS);
+       writel_relaxed(msg->data, ring + RING_MSI_DATA_VALUE);
+}
+
+static struct vfio_platform_reset_node vfio_platform_bcmflexrm_reset_node = {
+       .owner = THIS_MODULE,
+       .compat = "brcm,iproc-flexrm-mbox",
+       .of_reset = vfio_platform_bcmflexrm_reset,
+       .of_get_msi = bcm_num_msi,
+       .of_msi_write = bcm_write_msi
+};
+
+static int __init vfio_platform_bcmflexrm_reset_module_init(void)
+{
+       __vfio_platform_register_reset(&vfio_platform_bcmflexrm_reset_node);
+
+       return 0;
+}
+
+static void __exit vfio_platform_bcmflexrm_reset_module_exit(void)
+{
+       vfio_platform_unregister_reset("brcm,iproc-flexrm-mbox",
+                                      vfio_platform_bcmflexrm_reset);
+}
+
+module_init(vfio_platform_bcmflexrm_reset_module_init);
+module_exit(vfio_platform_bcmflexrm_reset_module_exit);
 
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Anup Patel <anup.pa...@broadcom.com>");
-- 
2.17.1

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