tile: support multiple mPIPE shims in tilegx network driver

The initial driver support was for a single mPIPE shim on the chip
(as is the case for the Gx36 hardware).  The Gx72 chip has two mPIPE
shims, so we extend the driver to handle that case.

Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 23 insertions, 2 deletions

diff --git a/arch/tile/gxio/mpipe.c b/arch/tile/gxio/mpipe.c
index 0567cf0cd29e..5301a9ffbae1 100644
--- a/arch/tile/gxio/mpipe.c
+++ b/arch/tile/gxio/mpipe.c
@@ -36,8 +36,14 @@ int gxio_mpipe_init(gxio_mpipe_context_t *context, unsigned int mpipe_index)
         int fd;
         int i;
 
+        if (mpipe_index >= GXIO_MPIPE_INSTANCE_MAX)
+                return -EINVAL;
+
         snprintf(file, sizeof(file), "mpipe/%d/iorpc", mpipe_index);
         fd = hv_dev_open((HV_VirtAddr) file, 0);
+
+        context->fd = fd;
+
         if (fd < 0) {
                 if (fd >= GXIO_ERR_MIN && fd <= GXIO_ERR_MAX)
                         return fd;
@@ -45,8 +51,6 @@ int gxio_mpipe_init(gxio_mpipe_context_t *context, unsigned int mpipe_index)
                         return -ENODEV;
         }
 
-        context->fd = fd;
-
         /* Map in the MMIO space. */
         context->mmio_cfg_base = (void __force *)
                 iorpc_ioremap(fd, HV_MPIPE_CONFIG_MMIO_OFFSET,
@@ -64,12 +68,15 @@ int gxio_mpipe_init(gxio_mpipe_context_t *context, unsigned int mpipe_index)
         for (i = 0; i < 8; i++)
                 context->__stacks.stacks[i] = 255;
 
+        context->instance = mpipe_index;
+
         return 0;
 
       fast_failed:
         iounmap((void __force __iomem *)(context->mmio_cfg_base));
       cfg_failed:
         hv_dev_close(context->fd);
+        context->fd = -1;
         return -ENODEV;
 }
 
@@ -496,6 +503,20 @@ static gxio_mpipe_context_t *_gxio_get_link_context(void)
         return contextp;
 }
 
+int gxio_mpipe_link_instance(const char *link_name)
+{
+        _gxio_mpipe_link_name_t name;
+        gxio_mpipe_context_t *context = _gxio_get_link_context();
+
+        if (!context)
+                return GXIO_ERR_NO_DEVICE;
+
+        strncpy(name.name, link_name, sizeof(name.name));
+        name.name[GXIO_MPIPE_LINK_NAME_LEN - 1] = '\0';
+
+        return gxio_mpipe_info_instance_aux(context, name);
+}
+
 int gxio_mpipe_link_enumerate_mac(int idx, char *link_name, uint8_t *link_mac)
 {
         int rv;