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path: root/drivers/net/wireless/broadcom/brcm80211/brcmsmac/dma.h
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Diffstat (limited to 'drivers/net/wireless/broadcom/brcm80211/brcmsmac/dma.h')
-rw-r--r--drivers/net/wireless/broadcom/brcm80211/brcmsmac/dma.h125
1 files changed, 125 insertions, 0 deletions
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/dma.h b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/dma.h
new file mode 100644
index 0000000..ff5b80b
--- /dev/null
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/dma.h
@@ -0,0 +1,125 @@
+/*
+ * Copyright (c) 2010 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.
+ */
+
+#ifndef _BRCM_DMA_H_
+#define _BRCM_DMA_H_
+
+#include <linux/delay.h>
+#include <linux/skbuff.h>
+#include "types.h" /* forward structure declarations */
+
+/* map/unmap direction */
+#define DMA_TX 1 /* TX direction for DMA */
+#define DMA_RX 2 /* RX direction for DMA */
+
+/* DMA structure:
+ * support two DMA engines: 32 bits address or 64 bit addressing
+ * basic DMA register set is per channel(transmit or receive)
+ * a pair of channels is defined for convenience
+ */
+
+/* 32 bits addressing */
+
+struct dma32diag { /* diag access */
+ u32 fifoaddr; /* diag address */
+ u32 fifodatalow; /* low 32bits of data */
+ u32 fifodatahigh; /* high 32bits of data */
+ u32 pad; /* reserved */
+};
+
+/* 64 bits addressing */
+
+/* dma registers per channel(xmt or rcv) */
+struct dma64regs {
+ u32 control; /* enable, et al */
+ u32 ptr; /* last descriptor posted to chip */
+ u32 addrlow; /* desc ring base address low 32-bits (8K aligned) */
+ u32 addrhigh; /* desc ring base address bits 63:32 (8K aligned) */
+ u32 status0; /* current descriptor, xmt state */
+ u32 status1; /* active descriptor, xmt error */
+};
+
+/* range param for dma_getnexttxp() and dma_txreclaim */
+enum txd_range {
+ DMA_RANGE_ALL = 1,
+ DMA_RANGE_TRANSMITTED,
+ DMA_RANGE_TRANSFERED
+};
+
+/*
+ * Exported data structure (read-only)
+ */
+/* export structure */
+struct dma_pub {
+ uint txavail; /* # free tx descriptors */
+ uint dmactrlflags; /* dma control flags */
+
+ /* rx error counters */
+ uint rxgiants; /* rx giant frames */
+ uint rxnobuf; /* rx out of dma descriptors */
+ /* tx error counters */
+ uint txnobuf; /* tx out of dma descriptors */
+};
+
+extern struct dma_pub *dma_attach(char *name, struct brcms_c_info *wlc,
+ uint txregbase, uint rxregbase,
+ uint ntxd, uint nrxd,
+ uint rxbufsize, int rxextheadroom,
+ uint nrxpost, uint rxoffset);
+
+void dma_rxinit(struct dma_pub *pub);
+int dma_rx(struct dma_pub *pub, struct sk_buff_head *skb_list);
+bool dma_rxfill(struct dma_pub *pub);
+bool dma_rxreset(struct dma_pub *pub);
+bool dma_txreset(struct dma_pub *pub);
+void dma_txinit(struct dma_pub *pub);
+int dma_txfast(struct brcms_c_info *wlc, struct dma_pub *pub,
+ struct sk_buff *p0);
+void dma_txflush(struct dma_pub *pub);
+int dma_txpending(struct dma_pub *pub);
+void dma_kick_tx(struct dma_pub *pub);
+void dma_txsuspend(struct dma_pub *pub);
+bool dma_txsuspended(struct dma_pub *pub);
+void dma_txresume(struct dma_pub *pub);
+void dma_txreclaim(struct dma_pub *pub, enum txd_range range);
+void dma_rxreclaim(struct dma_pub *pub);
+void dma_detach(struct dma_pub *pub);
+unsigned long dma_getvar(struct dma_pub *pub, const char *name);
+struct sk_buff *dma_getnexttxp(struct dma_pub *pub, enum txd_range range);
+void dma_counterreset(struct dma_pub *pub);
+
+void dma_walk_packets(struct dma_pub *dmah, void (*callback_fnc)
+ (void *pkt, void *arg_a), void *arg_a);
+
+/*
+ * DMA(Bug) on bcm47xx chips seems to declare that the packet is ready, but
+ * the packet length is not updated yet (by DMA) on the expected time.
+ * Workaround is to hold processor till DMA updates the length, and stay off
+ * the bus to allow DMA update the length in buffer
+ */
+static inline void dma_spin_for_len(uint len, struct sk_buff *head)
+{
+#if defined(CONFIG_BCM47XX)
+ if (!len) {
+ while (!(len = *(u16 *) KSEG1ADDR(head->data)))
+ udelay(1);
+
+ *(u16 *) (head->data) = cpu_to_le16((u16) len);
+ }
+#endif /* defined(CONFIG_BCM47XX) */
+}
+
+#endif /* _BRCM_DMA_H_ */