gianfar: Fix stashing support
Stashing is only supported on the 85xx (e500-based) SoCs. The 83xx and 86xx
chips don't have a proper cache for this. U-Boot has been updated to add
stashing properties to the device tree nodes of gianfar devices on 85xx. So
now we modify Linux to keep stashing off unless those properties are there.
Signed-off-by: Andy Fleming <afleming@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/Documentation/powerpc/dts-bindings/fsl/tsec.txt b/Documentation/powerpc/dts-bindings/fsl/tsec.txt
index 7fa4b27..edb7ae1 100644
--- a/Documentation/powerpc/dts-bindings/fsl/tsec.txt
+++ b/Documentation/powerpc/dts-bindings/fsl/tsec.txt
@@ -56,6 +56,12 @@
hardware.
- fsl,magic-packet : If present, indicates that the hardware supports
waking up via magic packet.
+ - bd-stash : If present, indicates that the hardware supports stashing
+ buffer descriptors in the L2.
+ - rx-stash-len : Denotes the number of bytes of a received buffer to stash
+ in the L2.
+ - rx-stash-idx : Denotes the index of the first byte from the received
+ buffer to stash in the L2.
Example:
ethernet@24000 {
diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c
index 33de256..dadd08c 100644
--- a/drivers/net/gianfar.c
+++ b/drivers/net/gianfar.c
@@ -164,6 +164,9 @@
struct gfar_private *priv = netdev_priv(dev);
struct device_node *np = priv->node;
char bus_name[MII_BUS_ID_SIZE];
+ const u32 *stash;
+ const u32 *stash_len;
+ const u32 *stash_idx;
if (!np || !of_device_is_available(np))
return -ENODEV;
@@ -193,6 +196,26 @@
}
}
+ stash = of_get_property(np, "bd-stash", NULL);
+
+ if(stash) {
+ priv->device_flags |= FSL_GIANFAR_DEV_HAS_BD_STASHING;
+ priv->bd_stash_en = 1;
+ }
+
+ stash_len = of_get_property(np, "rx-stash-len", NULL);
+
+ if (stash_len)
+ priv->rx_stash_size = *stash_len;
+
+ stash_idx = of_get_property(np, "rx-stash-idx", NULL);
+
+ if (stash_idx)
+ priv->rx_stash_index = *stash_idx;
+
+ if (stash_len || stash_idx)
+ priv->device_flags |= FSL_GIANFAR_DEV_HAS_BUF_STASHING;
+
mac_addr = of_get_mac_address(np);
if (mac_addr)
memcpy(dev->dev_addr, mac_addr, MAC_ADDR_LEN);
diff --git a/drivers/net/gianfar_sysfs.c b/drivers/net/gianfar_sysfs.c
index 74e0b4d..dd26da7 100644
--- a/drivers/net/gianfar_sysfs.c
+++ b/drivers/net/gianfar_sysfs.c
@@ -53,6 +53,9 @@
u32 temp;
unsigned long flags;
+ if (!(priv->device_flags & FSL_GIANFAR_DEV_HAS_BD_STASHING))
+ return count;
+
/* Find out the new setting */
if (!strncmp("on", buf, count - 1) || !strncmp("1", buf, count - 1))
new_setting = 1;
@@ -100,6 +103,9 @@
u32 temp;
unsigned long flags;
+ if (!(priv->device_flags & FSL_GIANFAR_DEV_HAS_BUF_STASHING))
+ return count;
+
spin_lock_irqsave(&priv->rxlock, flags);
if (length > priv->rx_buffer_size)
goto out;
@@ -152,6 +158,9 @@
u32 temp;
unsigned long flags;
+ if (!(priv->device_flags & FSL_GIANFAR_DEV_HAS_BUF_STASHING))
+ return count;
+
spin_lock_irqsave(&priv->rxlock, flags);
if (index > priv->rx_stash_size)
goto out;
@@ -294,12 +303,9 @@
int rc;
/* Initialize the default values */
- priv->rx_stash_size = DEFAULT_STASH_LENGTH;
- priv->rx_stash_index = DEFAULT_STASH_INDEX;
priv->fifo_threshold = DEFAULT_FIFO_TX_THR;
priv->fifo_starve = DEFAULT_FIFO_TX_STARVE;
priv->fifo_starve_off = DEFAULT_FIFO_TX_STARVE_OFF;
- priv->bd_stash_en = DEFAULT_BD_STASH;
/* Create our sysfs files */
rc = device_create_file(&dev->dev, &dev_attr_bd_stash);