[B43LEGACY]: add mac80211-based driver for legacy BCM43xx devices

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 367 insertions, 0 deletions

diff --git a/drivers/net/wireless/b43legacy/dma.h b/drivers/net/wireless/b43legacy/dma.h
new file mode 100644
index 000000000000..26f6ab08de75
--- /dev/null
+++ b/drivers/net/wireless/b43legacy/dma.h
@@ -0,0 +1,367 @@
+#ifndef B43legacy_DMA_H_
+#define B43legacy_DMA_H_
+
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/workqueue.h>
+#include <linux/linkage.h>
+#include <asm/atomic.h>
+
+#include "b43legacy.h"
+
+
+/* DMA-Interrupt reasons. */
+#define B43legacy_DMAIRQ_FATALMASK	((1 << 10) | (1 << 11) | (1 << 12) \
+					 | (1 << 14) | (1 << 15))
+#define B43legacy_DMAIRQ_NONFATALMASK	(1 << 13)
+#define B43legacy_DMAIRQ_RX_DONE		(1 << 16)
+
+
+/*** 32-bit DMA Engine. ***/
+
+/* 32-bit DMA controller registers. */
+#define B43legacy_DMA32_TXCTL				0x00
+#define		B43legacy_DMA32_TXENABLE		0x00000001
+#define		B43legacy_DMA32_TXSUSPEND		0x00000002
+#define		B43legacy_DMA32_TXLOOPBACK		0x00000004
+#define		B43legacy_DMA32_TXFLUSH			0x00000010
+#define		B43legacy_DMA32_TXADDREXT_MASK		0x00030000
+#define		B43legacy_DMA32_TXADDREXT_SHIFT		16
+#define B43legacy_DMA32_TXRING				0x04
+#define B43legacy_DMA32_TXINDEX				0x08
+#define B43legacy_DMA32_TXSTATUS			0x0C
+#define		B43legacy_DMA32_TXDPTR			0x00000FFF
+#define		B43legacy_DMA32_TXSTATE			0x0000F000
+#define			B43legacy_DMA32_TXSTAT_DISABLED	0x00000000
+#define			B43legacy_DMA32_TXSTAT_ACTIVE	0x00001000
+#define			B43legacy_DMA32_TXSTAT_IDLEWAIT	0x00002000
+#define			B43legacy_DMA32_TXSTAT_STOPPED	0x00003000
+#define			B43legacy_DMA32_TXSTAT_SUSP	0x00004000
+#define		B43legacy_DMA32_TXERROR			0x000F0000
+#define			B43legacy_DMA32_TXERR_NOERR	0x00000000
+#define			B43legacy_DMA32_TXERR_PROT	0x00010000
+#define			B43legacy_DMA32_TXERR_UNDERRUN	0x00020000
+#define			B43legacy_DMA32_TXERR_BUFREAD	0x00030000
+#define			B43legacy_DMA32_TXERR_DESCREAD	0x00040000
+#define		B43legacy_DMA32_TXACTIVE		0xFFF00000
+#define B43legacy_DMA32_RXCTL				0x10
+#define		B43legacy_DMA32_RXENABLE		0x00000001
+#define		B43legacy_DMA32_RXFROFF_MASK		0x000000FE
+#define		B43legacy_DMA32_RXFROFF_SHIFT		1
+#define		B43legacy_DMA32_RXDIRECTFIFO		0x00000100
+#define		B43legacy_DMA32_RXADDREXT_MASK		0x00030000
+#define		B43legacy_DMA32_RXADDREXT_SHIFT		16
+#define B43legacy_DMA32_RXRING				0x14
+#define B43legacy_DMA32_RXINDEX				0x18
+#define B43legacy_DMA32_RXSTATUS			0x1C
+#define		B43legacy_DMA32_RXDPTR			0x00000FFF
+#define		B43legacy_DMA32_RXSTATE			0x0000F000
+#define			B43legacy_DMA32_RXSTAT_DISABLED	0x00000000
+#define			B43legacy_DMA32_RXSTAT_ACTIVE	0x00001000
+#define			B43legacy_DMA32_RXSTAT_IDLEWAIT	0x00002000
+#define			B43legacy_DMA32_RXSTAT_STOPPED	0x00003000
+#define		B43legacy_DMA32_RXERROR			0x000F0000
+#define			B43legacy_DMA32_RXERR_NOERR	0x00000000
+#define			B43legacy_DMA32_RXERR_PROT	0x00010000
+#define			B43legacy_DMA32_RXERR_OVERFLOW	0x00020000
+#define			B43legacy_DMA32_RXERR_BUFWRITE	0x00030000
+#define			B43legacy_DMA32_RXERR_DESCREAD	0x00040000
+#define		B43legacy_DMA32_RXACTIVE		0xFFF00000
+
+/* 32-bit DMA descriptor. */
+struct b43legacy_dmadesc32 {
+	__le32 control;
+	__le32 address;
+} __attribute__((__packed__));
+#define B43legacy_DMA32_DCTL_BYTECNT		0x00001FFF
+#define B43legacy_DMA32_DCTL_ADDREXT_MASK	0x00030000
+#define B43legacy_DMA32_DCTL_ADDREXT_SHIFT	16
+#define B43legacy_DMA32_DCTL_DTABLEEND		0x10000000
+#define B43legacy_DMA32_DCTL_IRQ		0x20000000
+#define B43legacy_DMA32_DCTL_FRAMEEND		0x40000000
+#define B43legacy_DMA32_DCTL_FRAMESTART		0x80000000
+
+
+
+/*** 64-bit DMA Engine. ***/
+
+/* 64-bit DMA controller registers. */
+#define B43legacy_DMA64_TXCTL				0x00
+#define		B43legacy_DMA64_TXENABLE		0x00000001
+#define		B43legacy_DMA64_TXSUSPEND		0x00000002
+#define		B43legacy_DMA64_TXLOOPBACK		0x00000004
+#define		B43legacy_DMA64_TXFLUSH			0x00000010
+#define		B43legacy_DMA64_TXADDREXT_MASK		0x00030000
+#define		B43legacy_DMA64_TXADDREXT_SHIFT		16
+#define B43legacy_DMA64_TXINDEX				0x04
+#define B43legacy_DMA64_TXRINGLO			0x08
+#define B43legacy_DMA64_TXRINGHI			0x0C
+#define B43legacy_DMA64_TXSTATUS			0x10
+#define		B43legacy_DMA64_TXSTATDPTR		0x00001FFF
+#define		B43legacy_DMA64_TXSTAT			0xF0000000
+#define			B43legacy_DMA64_TXSTAT_DISABLED	0x00000000
+#define			B43legacy_DMA64_TXSTAT_ACTIVE	0x10000000
+#define			B43legacy_DMA64_TXSTAT_IDLEWAIT	0x20000000
+#define			B43legacy_DMA64_TXSTAT_STOPPED	0x30000000
+#define			B43legacy_DMA64_TXSTAT_SUSP	0x40000000
+#define B43legacy_DMA64_TXERROR				0x14
+#define		B43legacy_DMA64_TXERRDPTR		0x0001FFFF
+#define		B43legacy_DMA64_TXERR			0xF0000000
+#define			B43legacy_DMA64_TXERR_NOERR	0x00000000
+#define			B43legacy_DMA64_TXERR_PROT	0x10000000
+#define			B43legacy_DMA64_TXERR_UNDERRUN	0x20000000
+#define			B43legacy_DMA64_TXERR_TRANSFER	0x30000000
+#define			B43legacy_DMA64_TXERR_DESCREAD	0x40000000
+#define			B43legacy_DMA64_TXERR_CORE	0x50000000
+#define B43legacy_DMA64_RXCTL				0x20
+#define		B43legacy_DMA64_RXENABLE		0x00000001
+#define		B43legacy_DMA64_RXFROFF_MASK		0x000000FE
+#define		B43legacy_DMA64_RXFROFF_SHIFT		1
+#define		B43legacy_DMA64_RXDIRECTFIFO		0x00000100
+#define		B43legacy_DMA64_RXADDREXT_MASK		0x00030000
+#define		B43legacy_DMA64_RXADDREXT_SHIFT		16
+#define B43legacy_DMA64_RXINDEX				0x24
+#define B43legacy_DMA64_RXRINGLO			0x28
+#define B43legacy_DMA64_RXRINGHI			0x2C
+#define B43legacy_DMA64_RXSTATUS			0x30
+#define		B43legacy_DMA64_RXSTATDPTR		0x00001FFF
+#define		B43legacy_DMA64_RXSTAT			0xF0000000
+#define			B43legacy_DMA64_RXSTAT_DISABLED	0x00000000
+#define			B43legacy_DMA64_RXSTAT_ACTIVE	0x10000000
+#define			B43legacy_DMA64_RXSTAT_IDLEWAIT	0x20000000
+#define			B43legacy_DMA64_RXSTAT_STOPPED	0x30000000
+#define			B43legacy_DMA64_RXSTAT_SUSP	0x40000000
+#define B43legacy_DMA64_RXERROR				0x34
+#define		B43legacy_DMA64_RXERRDPTR		0x0001FFFF
+#define		B43legacy_DMA64_RXERR			0xF0000000
+#define			B43legacy_DMA64_RXERR_NOERR	0x00000000
+#define			B43legacy_DMA64_RXERR_PROT	0x10000000
+#define			B43legacy_DMA64_RXERR_UNDERRUN	0x20000000
+#define			B43legacy_DMA64_RXERR_TRANSFER	0x30000000
+#define			B43legacy_DMA64_RXERR_DESCREAD	0x40000000
+#define			B43legacy_DMA64_RXERR_CORE	0x50000000
+
+/* 64-bit DMA descriptor. */
+struct b43legacy_dmadesc64 {
+	__le32 control0;
+	__le32 control1;
+	__le32 address_low;
+	__le32 address_high;
+} __attribute__((__packed__));
+#define B43legacy_DMA64_DCTL0_DTABLEEND		0x10000000
+#define B43legacy_DMA64_DCTL0_IRQ		0x20000000
+#define B43legacy_DMA64_DCTL0_FRAMEEND		0x40000000
+#define B43legacy_DMA64_DCTL0_FRAMESTART	0x80000000
+#define B43legacy_DMA64_DCTL1_BYTECNT		0x00001FFF
+#define B43legacy_DMA64_DCTL1_ADDREXT_MASK	0x00030000
+#define B43legacy_DMA64_DCTL1_ADDREXT_SHIFT	16
+
+
+
+struct b43legacy_dmadesc_generic {
+	union {
+		struct b43legacy_dmadesc32 dma32;
+		struct b43legacy_dmadesc64 dma64;
+	} __attribute__((__packed__));
+} __attribute__((__packed__));
+
+
+/* Misc DMA constants */
+#define B43legacy_DMA_RINGMEMSIZE	PAGE_SIZE
+#define B43legacy_DMA0_RX_FRAMEOFFSET	30
+#define B43legacy_DMA3_RX_FRAMEOFFSET	0
+
+
+/* DMA engine tuning knobs */
+#define B43legacy_TXRING_SLOTS		128
+#define B43legacy_RXRING_SLOTS		64
+#define B43legacy_DMA0_RX_BUFFERSIZE	(2304 + 100)
+#define B43legacy_DMA3_RX_BUFFERSIZE	16
+
+
+
+#ifdef CONFIG_B43LEGACY_DMA
+
+
+struct sk_buff;
+struct b43legacy_private;
+struct b43legacy_txstatus;
+
+
+struct b43legacy_dmadesc_meta {
+	/* The kernel DMA-able buffer. */
+	struct sk_buff *skb;
+	/* DMA base bus-address of the descriptor buffer. */
+	dma_addr_t dmaaddr;
+	/* ieee80211 TX status. Only used once per 802.11 frag. */
+	bool is_last_fragment;
+	struct ieee80211_tx_status txstat;
+};
+
+struct b43legacy_dmaring;
+
+/* Lowlevel DMA operations that differ between 32bit and 64bit DMA. */
+struct b43legacy_dma_ops {
+	struct b43legacy_dmadesc_generic * (*idx2desc)
+					   (struct b43legacy_dmaring *ring,
+					   int slot,
+					   struct b43legacy_dmadesc_meta
+					   **meta);
+	void (*fill_descriptor)(struct b43legacy_dmaring *ring,
+				struct b43legacy_dmadesc_generic *desc,
+				dma_addr_t dmaaddr, u16 bufsize,
+				int start, int end, int irq);
+	void (*poke_tx)(struct b43legacy_dmaring *ring, int slot);
+	void (*tx_suspend)(struct b43legacy_dmaring *ring);
+	void (*tx_resume)(struct b43legacy_dmaring *ring);
+	int (*get_current_rxslot)(struct b43legacy_dmaring *ring);
+	void (*set_current_rxslot)(struct b43legacy_dmaring *ring, int slot);
+};
+
+struct b43legacy_dmaring {
+	/* Lowlevel DMA ops. */
+	const struct b43legacy_dma_ops *ops;
+	/* Kernel virtual base address of the ring memory. */
+	void *descbase;
+	/* Meta data about all descriptors. */
+	struct b43legacy_dmadesc_meta *meta;
+	/* Cache of TX headers for each slot.
+	 * This is to avoid an allocation on each TX.
+	 * This is NULL for an RX ring.
+	 */
+	u8 *txhdr_cache;
+	/* (Unadjusted) DMA base bus-address of the ring memory. */
+	dma_addr_t dmabase;
+	/* Number of descriptor slots in the ring. */
+	int nr_slots;
+	/* Number of used descriptor slots. */
+	int used_slots;
+	/* Currently used slot in the ring. */
+	int current_slot;
+	/* Total number of packets sent. Statistics only. */
+	unsigned int nr_tx_packets;
+	/* Frameoffset in octets. */
+	u32 frameoffset;
+	/* Descriptor buffer size. */
+	u16 rx_buffersize;
+	/* The MMIO base register of the DMA controller. */
+	u16 mmio_base;
+	/* DMA controller index number (0-5). */
+	int index;
+	/* Boolean. Is this a TX ring? */
+	bool tx;
+	/* Boolean. 64bit DMA if true, 32bit DMA otherwise. */
+	bool dma64;
+	/* Boolean. Is this ring stopped at ieee80211 level? */
+	bool stopped;
+	/* Lock, only used for TX. */
+	spinlock_t lock;
+	struct b43legacy_wldev *dev;
+#ifdef CONFIG_B43LEGACY_DEBUG
+	/* Maximum number of used slots. */
+	int max_used_slots;
+	/* Last time we injected a ring overflow. */
+	unsigned long last_injected_overflow;
+#endif /* CONFIG_B43LEGACY_DEBUG*/
+};
+
+
+static inline
+u32 b43legacy_dma_read(struct b43legacy_dmaring *ring,
+		       u16 offset)
+{
+	return b43legacy_read32(ring->dev, ring->mmio_base + offset);
+}
+
+static inline
+void b43legacy_dma_write(struct b43legacy_dmaring *ring,
+			 u16 offset, u32 value)
+{
+	b43legacy_write32(ring->dev, ring->mmio_base + offset, value);
+}
+
+
+int b43legacy_dma_init(struct b43legacy_wldev *dev);
+void b43legacy_dma_free(struct b43legacy_wldev *dev);
+
+int b43legacy_dmacontroller_rx_reset(struct b43legacy_wldev *dev,
+				     u16 dmacontroller_mmio_base,
+				     int dma64);
+int b43legacy_dmacontroller_tx_reset(struct b43legacy_wldev *dev,
+				     u16 dmacontroller_mmio_base,
+				     int dma64);
+
+u16 b43legacy_dmacontroller_base(int dma64bit, int dmacontroller_idx);
+
+void b43legacy_dma_tx_suspend(struct b43legacy_wldev *dev);
+void b43legacy_dma_tx_resume(struct b43legacy_wldev *dev);
+
+void b43legacy_dma_get_tx_stats(struct b43legacy_wldev *dev,
+				struct ieee80211_tx_queue_stats *stats);
+
+int b43legacy_dma_tx(struct b43legacy_wldev *dev,
+		     struct sk_buff *skb,
+		     struct ieee80211_tx_control *ctl);
+void b43legacy_dma_handle_txstatus(struct b43legacy_wldev *dev,
+				   const struct b43legacy_txstatus *status);
+
+void b43legacy_dma_rx(struct b43legacy_dmaring *ring);
+
+#else /* CONFIG_B43LEGACY_DMA */
+
+
+static inline
+int b43legacy_dma_init(struct b43legacy_wldev *dev)
+{
+	return 0;
+}
+static inline
+void b43legacy_dma_free(struct b43legacy_wldev *dev)
+{
+}
+static inline
+int b43legacy_dmacontroller_rx_reset(struct b43legacy_wldev *dev,
+				     u16 dmacontroller_mmio_base,
+				     int dma64)
+{
+	return 0;
+}
+static inline
+int b43legacy_dmacontroller_tx_reset(struct b43legacy_wldev *dev,
+				     u16 dmacontroller_mmio_base,
+				     int dma64)
+{
+	return 0;
+}
+static inline
+void b43legacy_dma_get_tx_stats(struct b43legacy_wldev *dev,
+				struct ieee80211_tx_queue_stats *stats)
+{
+}
+static inline
+int b43legacy_dma_tx(struct b43legacy_wldev *dev,
+		     struct sk_buff *skb,
+		     struct ieee80211_tx_control *ctl)
+{
+	return 0;
+}
+static inline
+void b43legacy_dma_handle_txstatus(struct b43legacy_wldev *dev,
+				   const struct b43legacy_txstatus *status)
+{
+}
+static inline
+void b43legacy_dma_rx(struct b43legacy_dmaring *ring)
+{
+}
+static inline
+void b43legacy_dma_tx_suspend(struct b43legacy_wldev *dev)
+{
+}
+static inline
+void b43legacy_dma_tx_resume(struct b43legacy_wldev *dev)
+{
+}
+
+#endif /* CONFIG_B43LEGACY_DMA */
+#endif /* B43legacy_DMA_H_ */