1 files changed, 273 insertions, 0 deletions

diff --git a/drivers/net/wireless/brcm80211/brcmfmac/commonring.c b/drivers/net/wireless/brcm80211/brcmfmac/commonring.c
new file mode 100644
index 000000000000..c6d65b8e1e15
--- /dev/null
+++ b/drivers/net/wireless/brcm80211/brcmfmac/commonring.c
@@ -0,0 +1,273 @@
+/* Copyright (c) 2014 Broadcom Corporation
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <linux/types.h>
+#include <linux/netdevice.h>
+
+#include <brcmu_utils.h>
+#include <brcmu_wifi.h>
+
+#include "dhd.h"
+#include "commonring.h"
+
+
+/* dma flushing needs implementation for mips and arm platforms. Should
+ * be put in util. Note, this is not real flushing. It is virtual non
+ * cached memory. Only write buffers should have to be drained. Though
+ * this may be different depending on platform......
+ * SEE ALSO msgbuf.c
+ */
+#define brcmf_dma_flush(addr, len)
+#define brcmf_dma_invalidate_cache(addr, len)
+
+
+void brcmf_commonring_register_cb(struct brcmf_commonring *commonring,
+				  int (*cr_ring_bell)(void *ctx),
+				  int (*cr_update_rptr)(void *ctx),
+				  int (*cr_update_wptr)(void *ctx),
+				  int (*cr_write_rptr)(void *ctx),
+				  int (*cr_write_wptr)(void *ctx), void *ctx)
+{
+	commonring->cr_ring_bell = cr_ring_bell;
+	commonring->cr_update_rptr = cr_update_rptr;
+	commonring->cr_update_wptr = cr_update_wptr;
+	commonring->cr_write_rptr = cr_write_rptr;
+	commonring->cr_write_wptr = cr_write_wptr;
+	commonring->cr_ctx = ctx;
+}
+
+
+void brcmf_commonring_config(struct brcmf_commonring *commonring, u16 depth,
+			     u16 item_len, void *buf_addr)
+{
+	commonring->depth = depth;
+	commonring->item_len = item_len;
+	commonring->buf_addr = buf_addr;
+	if (!commonring->inited) {
+		spin_lock_init(&commonring->lock);
+		commonring->inited = true;
+	}
+	commonring->r_ptr = 0;
+	if (commonring->cr_write_rptr)
+		commonring->cr_write_rptr(commonring->cr_ctx);
+	commonring->w_ptr = 0;
+	if (commonring->cr_write_wptr)
+		commonring->cr_write_wptr(commonring->cr_ctx);
+	commonring->f_ptr = 0;
+}
+
+
+void brcmf_commonring_lock(struct brcmf_commonring *commonring)
+		__acquires(&commonring->lock)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&commonring->lock, flags);
+	commonring->flags = flags;
+}
+
+
+void brcmf_commonring_unlock(struct brcmf_commonring *commonring)
+		__releases(&commonring->lock)
+{
+	spin_unlock_irqrestore(&commonring->lock, commonring->flags);
+}
+
+
+bool brcmf_commonring_write_available(struct brcmf_commonring *commonring)
+{
+	u16 available;
+	bool retry = true;
+
+again:
+	if (commonring->r_ptr <= commonring->w_ptr)
+		available = commonring->depth - commonring->w_ptr +
+			    commonring->r_ptr;
+	else
+		available = commonring->r_ptr - commonring->w_ptr;
+
+	if (available > 1) {
+		if (!commonring->was_full)
+			return true;
+		if (available > commonring->depth / 8) {
+			commonring->was_full = false;
+			return true;
+		}
+		if (retry) {
+			if (commonring->cr_update_rptr)
+				commonring->cr_update_rptr(commonring->cr_ctx);
+			retry = false;
+			goto again;
+		}
+		return false;
+	}
+
+	if (retry) {
+		if (commonring->cr_update_rptr)
+			commonring->cr_update_rptr(commonring->cr_ctx);
+		retry = false;
+		goto again;
+	}
+
+	commonring->was_full = true;
+	return false;
+}
+
+
+void *brcmf_commonring_reserve_for_write(struct brcmf_commonring *commonring)
+{
+	void *ret_ptr;
+	u16 available;
+	bool retry = true;
+
+again:
+	if (commonring->r_ptr <= commonring->w_ptr)
+		available = commonring->depth - commonring->w_ptr +
+			    commonring->r_ptr;
+	else
+		available = commonring->r_ptr - commonring->w_ptr;
+
+	if (available > 1) {
+		ret_ptr = commonring->buf_addr +
+			  (commonring->w_ptr * commonring->item_len);
+		commonring->w_ptr++;
+		if (commonring->w_ptr == commonring->depth)
+			commonring->w_ptr = 0;
+		return ret_ptr;
+	}
+
+	if (retry) {
+		if (commonring->cr_update_rptr)
+			commonring->cr_update_rptr(commonring->cr_ctx);
+		retry = false;
+		goto again;
+	}
+
+	commonring->was_full = true;
+	return NULL;
+}
+
+
+void *
+brcmf_commonring_reserve_for_write_multiple(struct brcmf_commonring *commonring,
+					    u16 n_items, u16 *alloced)
+{
+	void *ret_ptr;
+	u16 available;
+	bool retry = true;
+
+again:
+	if (commonring->r_ptr <= commonring->w_ptr)
+		available = commonring->depth - commonring->w_ptr +
+			    commonring->r_ptr;
+	else
+		available = commonring->r_ptr - commonring->w_ptr;
+
+	if (available > 1) {
+		ret_ptr = commonring->buf_addr +
+			  (commonring->w_ptr * commonring->item_len);
+		*alloced = min_t(u16, n_items, available - 1);
+		if (*alloced + commonring->w_ptr > commonring->depth)
+			*alloced = commonring->depth - commonring->w_ptr;
+		commonring->w_ptr += *alloced;
+		if (commonring->w_ptr == commonring->depth)
+			commonring->w_ptr = 0;
+		return ret_ptr;
+	}
+
+	if (retry) {
+		if (commonring->cr_update_rptr)
+			commonring->cr_update_rptr(commonring->cr_ctx);
+		retry = false;
+		goto again;
+	}
+
+	commonring->was_full = true;
+	return NULL;
+}
+
+
+int brcmf_commonring_write_complete(struct brcmf_commonring *commonring)
+{
+	void *address;
+
+	address = commonring->buf_addr;
+	address += (commonring->f_ptr * commonring->item_len);
+	if (commonring->f_ptr > commonring->w_ptr) {
+		brcmf_dma_flush(address,
+				(commonring->depth - commonring->f_ptr) *
+				commonring->item_len);
+		address = commonring->buf_addr;
+		commonring->f_ptr = 0;
+	}
+	brcmf_dma_flush(address, (commonring->w_ptr - commonring->f_ptr) *
+			commonring->item_len);
+
+	commonring->f_ptr = commonring->w_ptr;
+
+	if (commonring->cr_write_wptr)
+		commonring->cr_write_wptr(commonring->cr_ctx);
+	if (commonring->cr_ring_bell)
+		return commonring->cr_ring_bell(commonring->cr_ctx);
+
+	return -EIO;
+}
+
+
+void brcmf_commonring_write_cancel(struct brcmf_commonring *commonring,
+				   u16 n_items)
+{
+	if (commonring->w_ptr == 0)
+		commonring->w_ptr = commonring->depth - n_items;
+	else
+		commonring->w_ptr -= n_items;
+}
+
+
+void *brcmf_commonring_get_read_ptr(struct brcmf_commonring *commonring,
+				    u16 *n_items)
+{
+	void *ret_addr;
+
+	if (commonring->cr_update_wptr)
+		commonring->cr_update_wptr(commonring->cr_ctx);
+
+	*n_items = (commonring->w_ptr >= commonring->r_ptr) ?
+				(commonring->w_ptr - commonring->r_ptr) :
+				(commonring->depth - commonring->r_ptr);
+
+	if (*n_items == 0)
+		return NULL;
+
+	ret_addr = commonring->buf_addr +
+		   (commonring->r_ptr * commonring->item_len);
+
+	commonring->r_ptr += *n_items;
+	if (commonring->r_ptr == commonring->depth)
+		commonring->r_ptr = 0;
+
+	brcmf_dma_invalidate_cache(ret_addr, *n_ items * commonring->item_len);
+
+	return ret_addr;
+}
+
+
+int brcmf_commonring_read_complete(struct brcmf_commonring *commonring)
+{
+	if (commonring->cr_write_rptr)
+		return commonring->cr_write_rptr(commonring->cr_ctx);
+
+	return -EIO;
+}