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authorDavid Daney <ddaney@caviumnetworks.com>2009-05-05 17:35:21 -0700
committerRalf Baechle <ralf@linux-mips.org>2009-06-17 11:06:30 +0100
commit80ff0fd3ab6451407a20c19b80c1643c4a6d6434 (patch)
tree2d7021ac34269f0bce3ac18f7347bf6946640f36 /drivers/staging/octeon/ethernet-mem.c
parent38295fb2a09264671c82d490ce77c17d492378e0 (diff)
Staging: Add octeon-ethernet driver files.
The octeon-ethernet driver supports the sgmii, rgmii, spi, and xaui ports present on the Cavium OCTEON family of SOCs. These SOCs are multi-core mips64 processors with existing support over in arch/mips. The driver files can be categorized into three basic groups: 1) Register definitions, these are named cvmx-*-defs.h 2) Main driver code, these have names that don't start cvmx-. 3) Interface specific functions and other utility code, names starting with cvmx- Signed-off-by: David Daney <ddaney@caviumnetworks.com> Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'drivers/staging/octeon/ethernet-mem.c')
-rw-r--r--drivers/staging/octeon/ethernet-mem.c198
1 files changed, 198 insertions, 0 deletions
diff --git a/drivers/staging/octeon/ethernet-mem.c b/drivers/staging/octeon/ethernet-mem.c
new file mode 100644
index 000000000000..b595903e2af1
--- /dev/null
+++ b/drivers/staging/octeon/ethernet-mem.c
@@ -0,0 +1,198 @@
+/**********************************************************************
+ * Author: Cavium Networks
+ *
+ * Contact: support@caviumnetworks.com
+ * This file is part of the OCTEON SDK
+ *
+ * Copyright (c) 2003-2007 Cavium Networks
+ *
+ * This file is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, Version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This file is distributed in the hope that it will be useful, but
+ * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty
+ * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
+ * NONINFRINGEMENT. See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this file; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ * or visit http://www.gnu.org/licenses/.
+ *
+ * This file may also be available under a different license from Cavium.
+ * Contact Cavium Networks for more information
+**********************************************************************/
+#include <linux/kernel.h>
+#include <linux/netdevice.h>
+#include <linux/mii.h>
+#include <net/dst.h>
+
+#include <asm/octeon/octeon.h>
+
+#include "ethernet-defines.h"
+
+#include "cvmx-fpa.h"
+
+/**
+ * Fill the supplied hardware pool with skbuffs
+ *
+ * @pool: Pool to allocate an skbuff for
+ * @size: Size of the buffer needed for the pool
+ * @elements: Number of buffers to allocate
+ */
+static int cvm_oct_fill_hw_skbuff(int pool, int size, int elements)
+{
+ int freed = elements;
+ while (freed) {
+
+ struct sk_buff *skb = dev_alloc_skb(size + 128);
+ if (unlikely(skb == NULL)) {
+ pr_warning
+ ("Failed to allocate skb for hardware pool %d\n",
+ pool);
+ break;
+ }
+
+ skb_reserve(skb, 128 - (((unsigned long)skb->data) & 0x7f));
+ *(struct sk_buff **)(skb->data - sizeof(void *)) = skb;
+ cvmx_fpa_free(skb->data, pool, DONT_WRITEBACK(size / 128));
+ freed--;
+ }
+ return elements - freed;
+}
+
+/**
+ * Free the supplied hardware pool of skbuffs
+ *
+ * @pool: Pool to allocate an skbuff for
+ * @size: Size of the buffer needed for the pool
+ * @elements: Number of buffers to allocate
+ */
+static void cvm_oct_free_hw_skbuff(int pool, int size, int elements)
+{
+ char *memory;
+
+ do {
+ memory = cvmx_fpa_alloc(pool);
+ if (memory) {
+ struct sk_buff *skb =
+ *(struct sk_buff **)(memory - sizeof(void *));
+ elements--;
+ dev_kfree_skb(skb);
+ }
+ } while (memory);
+
+ if (elements < 0)
+ pr_warning("Freeing of pool %u had too many skbuffs (%d)\n",
+ pool, elements);
+ else if (elements > 0)
+ pr_warning("Freeing of pool %u is missing %d skbuffs\n",
+ pool, elements);
+}
+
+/**
+ * This function fills a hardware pool with memory. Depending
+ * on the config defines, this memory might come from the
+ * kernel or global 32bit memory allocated with
+ * cvmx_bootmem_alloc.
+ *
+ * @pool: Pool to populate
+ * @size: Size of each buffer in the pool
+ * @elements: Number of buffers to allocate
+ */
+static int cvm_oct_fill_hw_memory(int pool, int size, int elements)
+{
+ char *memory;
+ int freed = elements;
+
+ if (USE_32BIT_SHARED) {
+ extern uint64_t octeon_reserve32_memory;
+
+ memory =
+ cvmx_bootmem_alloc_range(elements * size, 128,
+ octeon_reserve32_memory,
+ octeon_reserve32_memory +
+ (CONFIG_CAVIUM_RESERVE32 << 20) -
+ 1);
+ if (memory == NULL)
+ panic("Unable to allocate %u bytes for FPA pool %d\n",
+ elements * size, pool);
+
+ pr_notice("Memory range %p - %p reserved for "
+ "hardware\n", memory,
+ memory + elements * size - 1);
+
+ while (freed) {
+ cvmx_fpa_free(memory, pool, 0);
+ memory += size;
+ freed--;
+ }
+ } else {
+ while (freed) {
+ /* We need to force alignment to 128 bytes here */
+ memory = kmalloc(size + 127, GFP_ATOMIC);
+ if (unlikely(memory == NULL)) {
+ pr_warning("Unable to allocate %u bytes for "
+ "FPA pool %d\n",
+ elements * size, pool);
+ break;
+ }
+ memory = (char *)(((unsigned long)memory + 127) & -128);
+ cvmx_fpa_free(memory, pool, 0);
+ freed--;
+ }
+ }
+ return elements - freed;
+}
+
+/**
+ * Free memory previously allocated with cvm_oct_fill_hw_memory
+ *
+ * @pool: FPA pool to free
+ * @size: Size of each buffer in the pool
+ * @elements: Number of buffers that should be in the pool
+ */
+static void cvm_oct_free_hw_memory(int pool, int size, int elements)
+{
+ if (USE_32BIT_SHARED) {
+ pr_warning("Warning: 32 shared memory is not freeable\n");
+ } else {
+ char *memory;
+ do {
+ memory = cvmx_fpa_alloc(pool);
+ if (memory) {
+ elements--;
+ kfree(phys_to_virt(cvmx_ptr_to_phys(memory)));
+ }
+ } while (memory);
+
+ if (elements < 0)
+ pr_warning("Freeing of pool %u had too many "
+ "buffers (%d)\n",
+ pool, elements);
+ else if (elements > 0)
+ pr_warning("Warning: Freeing of pool %u is "
+ "missing %d buffers\n",
+ pool, elements);
+ }
+}
+
+int cvm_oct_mem_fill_fpa(int pool, int size, int elements)
+{
+ int freed;
+ if (USE_SKBUFFS_IN_HW)
+ freed = cvm_oct_fill_hw_skbuff(pool, size, elements);
+ else
+ freed = cvm_oct_fill_hw_memory(pool, size, elements);
+ return freed;
+}
+
+void cvm_oct_mem_empty_fpa(int pool, int size, int elements)
+{
+ if (USE_SKBUFFS_IN_HW)
+ cvm_oct_free_hw_skbuff(pool, size, elements);
+ else
+ cvm_oct_free_hw_memory(pool, size, elements);
+}

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