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* Copyright (c) 2010 Broadcom Corporation
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* Permission to use, copy, modify, and/or distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
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* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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#include <linux/slab.h>
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#include <linux/skbuff.h>
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#include <linux/delay.h>
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#include <linux/pci.h>
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#include <brcmu_utils.h>
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* DMA hardware requires each descriptor ring to be 8kB aligned, and fit within
28
* a contiguous 8kB physical address.
30
#define D64RINGALIGN_BITS 13
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#define D64MAXRINGSZ (1 << D64RINGALIGN_BITS)
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#define D64RINGALIGN (1 << D64RINGALIGN_BITS)
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#define D64MAXDD (D64MAXRINGSZ / sizeof(struct dma64desc))
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/* transmit channel control */
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#define D64_XC_XE 0x00000001 /* transmit enable */
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#define D64_XC_SE 0x00000002 /* transmit suspend request */
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#define D64_XC_LE 0x00000004 /* loopback enable */
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#define D64_XC_FL 0x00000010 /* flush request */
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#define D64_XC_PD 0x00000800 /* parity check disable */
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#define D64_XC_AE 0x00030000 /* address extension bits */
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#define D64_XC_AE_SHIFT 16
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/* transmit descriptor table pointer */
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#define D64_XP_LD_MASK 0x00000fff /* last valid descriptor */
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/* transmit channel status */
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#define D64_XS0_CD_MASK 0x00001fff /* current descriptor pointer */
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#define D64_XS0_XS_MASK 0xf0000000 /* transmit state */
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#define D64_XS0_XS_SHIFT 28
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#define D64_XS0_XS_DISABLED 0x00000000 /* disabled */
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#define D64_XS0_XS_ACTIVE 0x10000000 /* active */
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#define D64_XS0_XS_IDLE 0x20000000 /* idle wait */
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#define D64_XS0_XS_STOPPED 0x30000000 /* stopped */
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#define D64_XS0_XS_SUSP 0x40000000 /* suspend pending */
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#define D64_XS1_AD_MASK 0x00001fff /* active descriptor */
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#define D64_XS1_XE_MASK 0xf0000000 /* transmit errors */
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#define D64_XS1_XE_SHIFT 28
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#define D64_XS1_XE_NOERR 0x00000000 /* no error */
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#define D64_XS1_XE_DPE 0x10000000 /* descriptor protocol error */
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#define D64_XS1_XE_DFU 0x20000000 /* data fifo underrun */
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#define D64_XS1_XE_DTE 0x30000000 /* data transfer error */
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#define D64_XS1_XE_DESRE 0x40000000 /* descriptor read error */
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#define D64_XS1_XE_COREE 0x50000000 /* core error */
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/* receive channel control */
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#define D64_RC_RE 0x00000001
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/* receive frame offset */
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#define D64_RC_RO_MASK 0x000000fe
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#define D64_RC_RO_SHIFT 1
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/* direct fifo receive (pio) mode */
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#define D64_RC_FM 0x00000100
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/* separate rx header descriptor enable */
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#define D64_RC_SH 0x00000200
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/* overflow continue */
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#define D64_RC_OC 0x00000400
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/* parity check disable */
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#define D64_RC_PD 0x00000800
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/* address extension bits */
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#define D64_RC_AE 0x00030000
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#define D64_RC_AE_SHIFT 16
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/* flags for dma controller */
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#define DMA_CTRL_PEN (1 << 0)
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/* rx overflow continue */
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#define DMA_CTRL_ROC (1 << 1)
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/* allow rx scatter to multiple descriptors */
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#define DMA_CTRL_RXMULTI (1 << 2)
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/* Unframed Rx/Tx data */
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#define DMA_CTRL_UNFRAMED (1 << 3)
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/* receive descriptor table pointer */
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#define D64_RP_LD_MASK 0x00000fff /* last valid descriptor */
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/* receive channel status */
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#define D64_RS0_CD_MASK 0x00001fff /* current descriptor pointer */
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#define D64_RS0_RS_MASK 0xf0000000 /* receive state */
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#define D64_RS0_RS_SHIFT 28
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#define D64_RS0_RS_DISABLED 0x00000000 /* disabled */
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#define D64_RS0_RS_ACTIVE 0x10000000 /* active */
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#define D64_RS0_RS_IDLE 0x20000000 /* idle wait */
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#define D64_RS0_RS_STOPPED 0x30000000 /* stopped */
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#define D64_RS0_RS_SUSP 0x40000000 /* suspend pending */
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#define D64_RS1_AD_MASK 0x0001ffff /* active descriptor */
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#define D64_RS1_RE_MASK 0xf0000000 /* receive errors */
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#define D64_RS1_RE_SHIFT 28
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#define D64_RS1_RE_NOERR 0x00000000 /* no error */
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#define D64_RS1_RE_DPO 0x10000000 /* descriptor protocol error */
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#define D64_RS1_RE_DFU 0x20000000 /* data fifo overflow */
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#define D64_RS1_RE_DTE 0x30000000 /* data transfer error */
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#define D64_RS1_RE_DESRE 0x40000000 /* descriptor read error */
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#define D64_RS1_RE_COREE 0x50000000 /* core error */
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#define D64_FA_OFF_MASK 0xffff /* offset */
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#define D64_FA_SEL_MASK 0xf0000 /* select */
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#define D64_FA_SEL_SHIFT 16
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#define D64_FA_SEL_XDD 0x00000 /* transmit dma data */
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#define D64_FA_SEL_XDP 0x10000 /* transmit dma pointers */
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#define D64_FA_SEL_RDD 0x40000 /* receive dma data */
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#define D64_FA_SEL_RDP 0x50000 /* receive dma pointers */
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#define D64_FA_SEL_XFD 0x80000 /* transmit fifo data */
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#define D64_FA_SEL_XFP 0x90000 /* transmit fifo pointers */
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#define D64_FA_SEL_RFD 0xc0000 /* receive fifo data */
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#define D64_FA_SEL_RFP 0xd0000 /* receive fifo pointers */
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#define D64_FA_SEL_RSD 0xe0000 /* receive frame status data */
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#define D64_FA_SEL_RSP 0xf0000 /* receive frame status pointers */
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/* descriptor control flags 1 */
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#define D64_CTRL_COREFLAGS 0x0ff00000 /* core specific flags */
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#define D64_CTRL1_EOT ((u32)1 << 28) /* end of descriptor table */
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#define D64_CTRL1_IOC ((u32)1 << 29) /* interrupt on completion */
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#define D64_CTRL1_EOF ((u32)1 << 30) /* end of frame */
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#define D64_CTRL1_SOF ((u32)1 << 31) /* start of frame */
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/* descriptor control flags 2 */
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/* buffer byte count. real data len must <= 16KB */
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#define D64_CTRL2_BC_MASK 0x00007fff
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/* address extension bits */
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#define D64_CTRL2_AE 0x00030000
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#define D64_CTRL2_AE_SHIFT 16
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#define D64_CTRL2_PARITY 0x00040000
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/* control flags in the range [27:20] are core-specific and not defined here */
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#define D64_CTRL_CORE_MASK 0x0ff00000
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#define D64_RX_FRM_STS_LEN 0x0000ffff /* frame length mask */
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#define D64_RX_FRM_STS_OVFL 0x00800000 /* RxOverFlow */
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#define D64_RX_FRM_STS_DSCRCNT 0x0f000000 /* no. of descriptors used - 1 */
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#define D64_RX_FRM_STS_DATATYPE 0xf0000000 /* core-dependent data type */
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* packet headroom necessary to accommodate the largest header
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* in the system, (i.e TXOFF). By doing, we avoid the need to
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* allocate an extra buffer for the header when bridging to WL.
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* There is a compile time check in wlc.c which ensure that this
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* value is at least as big as TXOFF. This value is used in
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#define BCMEXTRAHDROOM 172
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#define DMA_ERROR(args) \
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if (!(*di->msg_level & 1)) \
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#define DMA_TRACE(args) \
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if (!(*di->msg_level & 2)) \
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#define DMA_ERROR(args)
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#define DMA_TRACE(args)
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#define DMA_NONE(args)
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#define MAXNAMEL 8 /* 8 char names */
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/* macros to convert between byte offsets and indexes */
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#define B2I(bytes, type) ((bytes) / sizeof(type))
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#define I2B(index, type) ((index) * sizeof(type))
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#define PCI32ADDR_HIGH 0xc0000000 /* address[31:30] */
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#define PCI32ADDR_HIGH_SHIFT 30 /* address[31:30] */
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#define PCI64ADDR_HIGH 0x80000000 /* address[63] */
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#define PCI64ADDR_HIGH_SHIFT 31 /* address[63] */
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* Descriptors are only read by the hardware, never written back.
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__le32 ctrl1; /* misc control bits & bufcount */
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__le32 ctrl2; /* buffer count and address extension */
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__le32 addrlow; /* memory address of the date buffer, bits 31:0 */
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__le32 addrhigh; /* memory address of the date buffer, bits 63:32 */
215
/* dma engine software state */
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struct dma_pub dma; /* exported structure */
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uint *msg_level; /* message level pointer */
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char name[MAXNAMEL]; /* callers name for diag msgs */
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struct pci_dev *pbus; /* bus handle */
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bool dma64; /* this dma engine is operating in 64-bit mode */
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bool addrext; /* this dma engine supports DmaExtendedAddrChanges */
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/* 64-bit dma tx engine registers */
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struct dma64regs __iomem *d64txregs;
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/* 64-bit dma rx engine registers */
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struct dma64regs __iomem *d64rxregs;
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/* pointer to dma64 tx descriptor ring */
231
struct dma64desc *txd64;
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/* pointer to dma64 rx descriptor ring */
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struct dma64desc *rxd64;
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u16 dmadesc_align; /* alignment requirement for dma descriptors */
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u16 ntxd; /* # tx descriptors tunable */
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u16 txin; /* index of next descriptor to reclaim */
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u16 txout; /* index of next descriptor to post */
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/* pointer to parallel array of pointers to packets */
241
struct sk_buff **txp;
242
/* Aligned physical address of descriptor ring */
244
/* Original physical address of descriptor ring */
245
dma_addr_t txdpaorig;
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u16 txdalign; /* #bytes added to alloc'd mem to align txd */
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u32 txdalloc; /* #bytes allocated for the ring */
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u32 xmtptrbase; /* When using unaligned descriptors, the ptr register
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* is not just an index, it needs all 13 bits to be
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* an offset from the addr register.
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u16 nrxd; /* # rx descriptors tunable */
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u16 rxin; /* index of next descriptor to reclaim */
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u16 rxout; /* index of next descriptor to post */
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/* pointer to parallel array of pointers to packets */
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struct sk_buff **rxp;
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/* Aligned physical address of descriptor ring */
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/* Original physical address of descriptor ring */
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dma_addr_t rxdpaorig;
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u16 rxdalign; /* #bytes added to alloc'd mem to align rxd */
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u32 rxdalloc; /* #bytes allocated for the ring */
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u32 rcvptrbase; /* Base for ptr reg when using unaligned descriptors */
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unsigned int rxbufsize; /* rx buffer size in bytes, not including
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uint rxextrahdrroom; /* extra rx headroom, reverseved to assist upper
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* stack, e.g. some rx pkt buffers will be
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* bridged to tx side without byte copying.
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* The extra headroom needs to be large enough
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* to fit txheader needs. Some dongle driver may
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uint nrxpost; /* # rx buffers to keep posted */
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unsigned int rxoffset; /* rxcontrol offset */
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/* add to get dma address of descriptor ring, low 32 bits */
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/* add to get dma address of data buffer, low 32 bits */
287
/* descriptor base need to be aligned or not */
292
* default dma message level (if input msg_level
293
* pointer is null in dma_attach())
295
static uint dma_msg_level;
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/* Check for odd number of 1's */
298
static u32 parity32(__le32 data)
300
/* no swap needed for counting 1's */
301
u32 par_data = *(u32 *)&data;
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par_data ^= par_data >> 16;
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par_data ^= par_data >> 8;
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par_data ^= par_data >> 4;
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par_data ^= par_data >> 2;
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par_data ^= par_data >> 1;
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static bool dma64_dd_parity(struct dma64desc *dd)
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return parity32(dd->addrlow ^ dd->addrhigh ^ dd->ctrl1 ^ dd->ctrl2);
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/* descriptor bumping functions */
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static uint xxd(uint x, uint n)
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return x & (n - 1); /* faster than %, but n must be power of 2 */
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static uint txd(struct dma_info *di, uint x)
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return xxd(x, di->ntxd);
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static uint rxd(struct dma_info *di, uint x)
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return xxd(x, di->nrxd);
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static uint nexttxd(struct dma_info *di, uint i)
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return txd(di, i + 1);
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static uint prevtxd(struct dma_info *di, uint i)
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return txd(di, i - 1);
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static uint nextrxd(struct dma_info *di, uint i)
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return txd(di, i + 1);
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static uint ntxdactive(struct dma_info *di, uint h, uint t)
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static uint nrxdactive(struct dma_info *di, uint h, uint t)
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static uint _dma_ctrlflags(struct dma_info *di, uint mask, uint flags)
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DMA_ERROR(("_dma_ctrlflags: NULL dma handle\n"));
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dmactrlflags = di->dma.dmactrlflags;
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dmactrlflags &= ~mask;
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dmactrlflags |= flags;
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/* If trying to enable parity, check if parity is actually supported */
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if (dmactrlflags & DMA_CTRL_PEN) {
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control = R_REG(&di->d64txregs->control);
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W_REG(&di->d64txregs->control,
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control | D64_XC_PD);
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if (R_REG(&di->d64txregs->control) & D64_XC_PD)
380
/* We *can* disable it so it is supported,
381
* restore control register
383
W_REG(&di->d64txregs->control,
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/* Not supported, don't allow it to be enabled */
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dmactrlflags &= ~DMA_CTRL_PEN;
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di->dma.dmactrlflags = dmactrlflags;
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static bool _dma64_addrext(struct dma64regs __iomem *dma64regs)
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OR_REG(&dma64regs->control, D64_XC_AE);
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w = R_REG(&dma64regs->control);
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AND_REG(&dma64regs->control, ~D64_XC_AE);
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return (w & D64_XC_AE) == D64_XC_AE;
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* return true if this dma engine supports DmaExtendedAddrChanges,
408
static bool _dma_isaddrext(struct dma_info *di)
410
/* DMA64 supports full 32- or 64-bit operation. AE is always valid */
412
/* not all tx or rx channel are available */
413
if (di->d64txregs != NULL) {
414
if (!_dma64_addrext(di->d64txregs))
415
DMA_ERROR(("%s: _dma_isaddrext: DMA64 tx doesn't have "
416
"AE set\n", di->name));
418
} else if (di->d64rxregs != NULL) {
419
if (!_dma64_addrext(di->d64rxregs))
420
DMA_ERROR(("%s: _dma_isaddrext: DMA64 rx doesn't have "
421
"AE set\n", di->name));
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static bool _dma_descriptor_align(struct dma_info *di)
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/* Check to see if the descriptors need to be aligned on 4K/8K or not */
433
if (di->d64txregs != NULL) {
434
W_REG(&di->d64txregs->addrlow, 0xff0);
435
addrl = R_REG(&di->d64txregs->addrlow);
438
} else if (di->d64rxregs != NULL) {
439
W_REG(&di->d64rxregs->addrlow, 0xff0);
440
addrl = R_REG(&di->d64rxregs->addrlow);
448
* Descriptor table must start at the DMA hardware dictated alignment, so
449
* allocated memory must be large enough to support this requirement.
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static void *dma_alloc_consistent(struct pci_dev *pdev, uint size,
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u16 align_bits, uint *alloced,
456
u16 align = (1 << align_bits);
457
if (!IS_ALIGNED(PAGE_SIZE, align))
461
return pci_alloc_consistent(pdev, size, pap);
465
u8 dma_align_sizetobits(uint size)
473
/* This function ensures that the DMA descriptor ring will not get allocated
474
* across Page boundary. If the allocation is done across the page boundary
475
* at the first time, then it is freed and the allocation is done at
476
* descriptor ring size aligned location. This will ensure that the ring will
477
* not cross page boundary
479
static void *dma_ringalloc(struct dma_info *di, u32 boundary, uint size,
480
u16 *alignbits, uint *alloced,
485
u32 alignbytes = 1 << *alignbits;
487
va = dma_alloc_consistent(di->pbus, size, *alignbits, alloced, descpa);
492
desc_strtaddr = (u32) roundup((unsigned long)va, alignbytes);
493
if (((desc_strtaddr + size - 1) & boundary) != (desc_strtaddr
495
*alignbits = dma_align_sizetobits(size);
496
pci_free_consistent(di->pbus, size, va, *descpa);
497
va = dma_alloc_consistent(di->pbus, size, *alignbits,
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static bool dma64_alloc(struct dma_info *di, uint direction)
512
ddlen = sizeof(struct dma64desc);
514
size = (direction == DMA_TX) ? (di->ntxd * ddlen) : (di->nrxd * ddlen);
515
align_bits = di->dmadesc_align;
516
align = (1 << align_bits);
518
if (direction == DMA_TX) {
519
va = dma_ringalloc(di, D64RINGALIGN, size, &align_bits,
520
&alloced, &di->txdpaorig);
522
DMA_ERROR(("%s: dma64_alloc: DMA_ALLOC_CONSISTENT(ntxd)"
523
" failed\n", di->name));
526
align = (1 << align_bits);
527
di->txd64 = (struct dma64desc *)
528
roundup((unsigned long)va, align);
529
di->txdalign = (uint) ((s8 *)di->txd64 - (s8 *) va);
530
di->txdpa = di->txdpaorig + di->txdalign;
531
di->txdalloc = alloced;
533
va = dma_ringalloc(di, D64RINGALIGN, size, &align_bits,
534
&alloced, &di->rxdpaorig);
536
DMA_ERROR(("%s: dma64_alloc: DMA_ALLOC_CONSISTENT(nrxd)"
537
" failed\n", di->name));
540
align = (1 << align_bits);
541
di->rxd64 = (struct dma64desc *)
542
roundup((unsigned long)va, align);
543
di->rxdalign = (uint) ((s8 *)di->rxd64 - (s8 *) va);
544
di->rxdpa = di->rxdpaorig + di->rxdalign;
545
di->rxdalloc = alloced;
551
static bool _dma_alloc(struct dma_info *di, uint direction)
553
return dma64_alloc(di, direction);
556
struct dma_pub *dma_attach(char *name, struct si_pub *sih,
557
void __iomem *dmaregstx, void __iomem *dmaregsrx,
558
uint ntxd, uint nrxd,
559
uint rxbufsize, int rxextheadroom,
560
uint nrxpost, uint rxoffset, uint *msg_level)
565
/* allocate private info structure */
566
di = kzalloc(sizeof(struct dma_info), GFP_ATOMIC);
570
di->msg_level = msg_level ? msg_level : &dma_msg_level;
573
di->dma64 = ((ai_core_sflags(sih, 0, 0) & SISF_DMA64) == SISF_DMA64);
575
/* init dma reg pointer */
576
di->d64txregs = (struct dma64regs __iomem *) dmaregstx;
577
di->d64rxregs = (struct dma64regs __iomem *) dmaregsrx;
580
* Default flags (which can be changed by the driver calling
581
* dma_ctrlflags before enable): For backwards compatibility
582
* both Rx Overflow Continue and Parity are DISABLED.
584
_dma_ctrlflags(di, DMA_CTRL_ROC | DMA_CTRL_PEN, 0);
586
DMA_TRACE(("%s: dma_attach: %s flags 0x%x ntxd %d nrxd %d "
587
"rxbufsize %d rxextheadroom %d nrxpost %d rxoffset %d "
588
"dmaregstx %p dmaregsrx %p\n", name, "DMA64",
589
di->dma.dmactrlflags, ntxd, nrxd, rxbufsize,
590
rxextheadroom, nrxpost, rxoffset, dmaregstx, dmaregsrx));
592
/* make a private copy of our callers name */
593
strncpy(di->name, name, MAXNAMEL);
594
di->name[MAXNAMEL - 1] = '\0';
596
di->pbus = ((struct si_info *)sih)->pbus;
599
di->ntxd = (u16) ntxd;
600
di->nrxd = (u16) nrxd;
602
/* the actual dma size doesn't include the extra headroom */
604
(rxextheadroom == -1) ? BCMEXTRAHDROOM : rxextheadroom;
605
if (rxbufsize > BCMEXTRAHDROOM)
606
di->rxbufsize = (u16) (rxbufsize - di->rxextrahdrroom);
608
di->rxbufsize = (u16) rxbufsize;
610
di->nrxpost = (u16) nrxpost;
611
di->rxoffset = (u8) rxoffset;
614
* figure out the DMA physical address offset for dd and data
615
* PCI/PCIE: they map silicon backplace address to zero
616
* based memory, need offset
617
* Other bus: use zero SI_BUS BIGENDIAN kludge: use sdram
618
* swapped region for data buffer, not descriptor
621
di->dataoffsetlow = 0;
622
/* add offset for pcie with DMA64 bus */
624
di->ddoffsethigh = SI_PCIE_DMA_H32;
625
di->dataoffsetlow = di->ddoffsetlow;
626
di->dataoffsethigh = di->ddoffsethigh;
627
/* WAR64450 : DMACtl.Addr ext fields are not supported in SDIOD core. */
628
if ((ai_coreid(sih) == SDIOD_CORE_ID)
629
&& ((ai_corerev(sih) > 0) && (ai_corerev(sih) <= 2)))
631
else if ((ai_coreid(sih) == I2S_CORE_ID) &&
632
((ai_corerev(sih) == 0) || (ai_corerev(sih) == 1)))
635
di->addrext = _dma_isaddrext(di);
637
/* does the descriptor need to be aligned and if yes, on 4K/8K or not */
638
di->aligndesc_4k = _dma_descriptor_align(di);
639
if (di->aligndesc_4k) {
640
di->dmadesc_align = D64RINGALIGN_BITS;
641
if ((ntxd < D64MAXDD / 2) && (nrxd < D64MAXDD / 2))
642
/* for smaller dd table, HW relax alignment reqmnt */
643
di->dmadesc_align = D64RINGALIGN_BITS - 1;
645
di->dmadesc_align = 4; /* 16 byte alignment */
648
DMA_NONE(("DMA descriptor align_needed %d, align %d\n",
649
di->aligndesc_4k, di->dmadesc_align));
651
/* allocate tx packet pointer vector */
653
size = ntxd * sizeof(void *);
654
di->txp = kzalloc(size, GFP_ATOMIC);
659
/* allocate rx packet pointer vector */
661
size = nrxd * sizeof(void *);
662
di->rxp = kzalloc(size, GFP_ATOMIC);
668
* allocate transmit descriptor ring, only need ntxd descriptors
669
* but it must be aligned
672
if (!_dma_alloc(di, DMA_TX))
677
* allocate receive descriptor ring, only need nrxd descriptors
678
* but it must be aligned
681
if (!_dma_alloc(di, DMA_RX))
685
if ((di->ddoffsetlow != 0) && !di->addrext) {
686
if (di->txdpa > SI_PCI_DMA_SZ) {
687
DMA_ERROR(("%s: dma_attach: txdpa 0x%x: addrext not "
688
"supported\n", di->name, (u32)di->txdpa));
691
if (di->rxdpa > SI_PCI_DMA_SZ) {
692
DMA_ERROR(("%s: dma_attach: rxdpa 0x%x: addrext not "
693
"supported\n", di->name, (u32)di->rxdpa));
698
DMA_TRACE(("ddoffsetlow 0x%x ddoffsethigh 0x%x dataoffsetlow 0x%x "
699
"dataoffsethigh " "0x%x addrext %d\n", di->ddoffsetlow,
700
di->ddoffsethigh, di->dataoffsetlow, di->dataoffsethigh,
703
return (struct dma_pub *) di;
706
dma_detach((struct dma_pub *)di);
711
dma64_dd_upd(struct dma_info *di, struct dma64desc *ddring,
712
dma_addr_t pa, uint outidx, u32 *flags, u32 bufcount)
714
u32 ctrl2 = bufcount & D64_CTRL2_BC_MASK;
716
/* PCI bus with big(>1G) physical address, use address extension */
717
if ((di->dataoffsetlow == 0) || !(pa & PCI32ADDR_HIGH)) {
718
ddring[outidx].addrlow = cpu_to_le32(pa + di->dataoffsetlow);
719
ddring[outidx].addrhigh = cpu_to_le32(di->dataoffsethigh);
720
ddring[outidx].ctrl1 = cpu_to_le32(*flags);
721
ddring[outidx].ctrl2 = cpu_to_le32(ctrl2);
723
/* address extension for 32-bit PCI */
726
ae = (pa & PCI32ADDR_HIGH) >> PCI32ADDR_HIGH_SHIFT;
727
pa &= ~PCI32ADDR_HIGH;
729
ctrl2 |= (ae << D64_CTRL2_AE_SHIFT) & D64_CTRL2_AE;
730
ddring[outidx].addrlow = cpu_to_le32(pa + di->dataoffsetlow);
731
ddring[outidx].addrhigh = cpu_to_le32(di->dataoffsethigh);
732
ddring[outidx].ctrl1 = cpu_to_le32(*flags);
733
ddring[outidx].ctrl2 = cpu_to_le32(ctrl2);
735
if (di->dma.dmactrlflags & DMA_CTRL_PEN) {
736
if (dma64_dd_parity(&ddring[outidx]))
737
ddring[outidx].ctrl2 =
738
cpu_to_le32(ctrl2 | D64_CTRL2_PARITY);
742
/* !! may be called with core in reset */
743
void dma_detach(struct dma_pub *pub)
745
struct dma_info *di = (struct dma_info *)pub;
747
DMA_TRACE(("%s: dma_detach\n", di->name));
749
/* free dma descriptor rings */
751
pci_free_consistent(di->pbus, di->txdalloc,
752
((s8 *)di->txd64 - di->txdalign),
755
pci_free_consistent(di->pbus, di->rxdalloc,
756
((s8 *)di->rxd64 - di->rxdalign),
759
/* free packet pointer vectors */
763
/* free our private info structure */
768
/* initialize descriptor table base address */
770
_dma_ddtable_init(struct dma_info *di, uint direction, dma_addr_t pa)
772
if (!di->aligndesc_4k) {
773
if (direction == DMA_TX)
779
if ((di->ddoffsetlow == 0)
780
|| !(pa & PCI32ADDR_HIGH)) {
781
if (direction == DMA_TX) {
782
W_REG(&di->d64txregs->addrlow, pa + di->ddoffsetlow);
783
W_REG(&di->d64txregs->addrhigh, di->ddoffsethigh);
785
W_REG(&di->d64rxregs->addrlow, pa + di->ddoffsetlow);
786
W_REG(&di->d64rxregs->addrhigh, di->ddoffsethigh);
789
/* DMA64 32bits address extension */
792
/* shift the high bit(s) from pa to ae */
793
ae = (pa & PCI32ADDR_HIGH) >> PCI32ADDR_HIGH_SHIFT;
794
pa &= ~PCI32ADDR_HIGH;
796
if (direction == DMA_TX) {
797
W_REG(&di->d64txregs->addrlow, pa + di->ddoffsetlow);
798
W_REG(&di->d64txregs->addrhigh, di->ddoffsethigh);
799
SET_REG(&di->d64txregs->control,
800
D64_XC_AE, (ae << D64_XC_AE_SHIFT));
802
W_REG(&di->d64rxregs->addrlow, pa + di->ddoffsetlow);
803
W_REG(&di->d64rxregs->addrhigh, di->ddoffsethigh);
804
SET_REG(&di->d64rxregs->control,
805
D64_RC_AE, (ae << D64_RC_AE_SHIFT));
810
static void _dma_rxenable(struct dma_info *di)
812
uint dmactrlflags = di->dma.dmactrlflags;
815
DMA_TRACE(("%s: dma_rxenable\n", di->name));
818
(R_REG(&di->d64rxregs->control) & D64_RC_AE) |
821
if ((dmactrlflags & DMA_CTRL_PEN) == 0)
822
control |= D64_RC_PD;
824
if (dmactrlflags & DMA_CTRL_ROC)
825
control |= D64_RC_OC;
827
W_REG(&di->d64rxregs->control,
828
((di->rxoffset << D64_RC_RO_SHIFT) | control));
831
void dma_rxinit(struct dma_pub *pub)
833
struct dma_info *di = (struct dma_info *)pub;
835
DMA_TRACE(("%s: dma_rxinit\n", di->name));
840
di->rxin = di->rxout = 0;
842
/* clear rx descriptor ring */
843
memset(di->rxd64, '\0', di->nrxd * sizeof(struct dma64desc));
845
/* DMA engine with out alignment requirement requires table to be inited
846
* before enabling the engine
848
if (!di->aligndesc_4k)
849
_dma_ddtable_init(di, DMA_RX, di->rxdpa);
853
if (di->aligndesc_4k)
854
_dma_ddtable_init(di, DMA_RX, di->rxdpa);
857
static struct sk_buff *dma64_getnextrxp(struct dma_info *di, bool forceall)
865
/* return if no packets posted */
870
B2I(((R_REG(&di->d64rxregs->status0) & D64_RS0_CD_MASK) -
871
di->rcvptrbase) & D64_RS0_CD_MASK, struct dma64desc);
873
/* ignore curr if forceall */
874
if (!forceall && (i == curr))
877
/* get the packet pointer that corresponds to the rx descriptor */
881
pa = le32_to_cpu(di->rxd64[i].addrlow) - di->dataoffsetlow;
883
/* clear this packet from the descriptor ring */
884
pci_unmap_single(di->pbus, pa, di->rxbufsize, PCI_DMA_FROMDEVICE);
886
di->rxd64[i].addrlow = cpu_to_le32(0xdeadbeef);
887
di->rxd64[i].addrhigh = cpu_to_le32(0xdeadbeef);
889
di->rxin = nextrxd(di, i);
894
static struct sk_buff *_dma_getnextrxp(struct dma_info *di, bool forceall)
899
return dma64_getnextrxp(di, forceall);
903
* !! rx entry routine
904
* returns a pointer to the next frame received, or NULL if there are no more
905
* if DMA_CTRL_RXMULTI is defined, DMA scattering(multiple buffers) is
906
* supported with pkts chain
907
* otherwise, it's treated as giant pkt and will be tossed.
908
* The DMA scattering starts with normal DMA header, followed by first
909
* buffer data. After it reaches the max size of buffer, the data continues
910
* in next DMA descriptor buffer WITHOUT DMA header
912
struct sk_buff *dma_rx(struct dma_pub *pub)
914
struct dma_info *di = (struct dma_info *)pub;
915
struct sk_buff *p, *head, *tail;
921
head = _dma_getnextrxp(di, false);
925
len = le16_to_cpu(*(__le16 *) (head->data));
926
DMA_TRACE(("%s: dma_rx len %d\n", di->name, len));
927
dma_spin_for_len(len, head);
929
/* set actual length */
930
pkt_len = min((di->rxoffset + len), di->rxbufsize);
931
__skb_trim(head, pkt_len);
932
resid = len - (di->rxbufsize - di->rxoffset);
934
/* check for single or multi-buffer rx */
937
while ((resid > 0) && (p = _dma_getnextrxp(di, false))) {
939
pkt_len = min_t(uint, resid, di->rxbufsize);
940
__skb_trim(p, pkt_len);
943
resid -= di->rxbufsize;
950
B2I(((R_REG(&di->d64rxregs->status0) &
952
di->rcvptrbase) & D64_RS0_CD_MASK,
954
DMA_ERROR(("dma_rx, rxin %d rxout %d, hw_curr %d\n",
955
di->rxin, di->rxout, cur));
959
if ((di->dma.dmactrlflags & DMA_CTRL_RXMULTI) == 0) {
960
DMA_ERROR(("%s: dma_rx: bad frame length (%d)\n",
962
brcmu_pkt_buf_free_skb(head);
971
static bool dma64_rxidle(struct dma_info *di)
973
DMA_TRACE(("%s: dma_rxidle\n", di->name));
978
return ((R_REG(&di->d64rxregs->status0) & D64_RS0_CD_MASK) ==
979
(R_REG(&di->d64rxregs->ptr) & D64_RS0_CD_MASK));
983
* post receive buffers
984
* return false is refill failed completely and ring is empty this will stall
985
* the rx dma and user might want to call rxfill again asap. This unlikely
986
* happens on memory-rich NIC, but often on memory-constrained dongle
988
bool dma_rxfill(struct dma_pub *pub)
990
struct dma_info *di = (struct dma_info *)pub;
997
uint extra_offset = 0;
1003
* Determine how many receive buffers we're lacking
1004
* from the full complement, allocate, initialize,
1005
* and post them, then update the chip rx lastdscr.
1011
n = di->nrxpost - nrxdactive(di, rxin, rxout);
1013
DMA_TRACE(("%s: dma_rxfill: post %d\n", di->name, n));
1015
if (di->rxbufsize > BCMEXTRAHDROOM)
1016
extra_offset = di->rxextrahdrroom;
1018
for (i = 0; i < n; i++) {
1020
* the di->rxbufsize doesn't include the extra headroom,
1021
* we need to add it to the size to be allocated
1023
p = brcmu_pkt_buf_get_skb(di->rxbufsize + extra_offset);
1026
DMA_ERROR(("%s: dma_rxfill: out of rxbufs\n",
1028
if (i == 0 && dma64_rxidle(di)) {
1029
DMA_ERROR(("%s: rxfill64: ring is empty !\n",
1036
/* reserve an extra headroom, if applicable */
1038
skb_pull(p, extra_offset);
1040
/* Do a cached write instead of uncached write since DMA_MAP
1041
* will flush the cache.
1043
*(u32 *) (p->data) = 0;
1045
pa = pci_map_single(di->pbus, p->data,
1046
di->rxbufsize, PCI_DMA_FROMDEVICE);
1048
/* save the free packet pointer */
1051
/* reset flags for each descriptor */
1053
if (rxout == (di->nrxd - 1))
1054
flags = D64_CTRL1_EOT;
1056
dma64_dd_upd(di, di->rxd64, pa, rxout, &flags,
1058
rxout = nextrxd(di, rxout);
1063
/* update the chip lastdscr pointer */
1064
W_REG(&di->d64rxregs->ptr,
1065
di->rcvptrbase + I2B(rxout, struct dma64desc));
1070
void dma_rxreclaim(struct dma_pub *pub)
1072
struct dma_info *di = (struct dma_info *)pub;
1075
DMA_TRACE(("%s: dma_rxreclaim\n", di->name));
1077
while ((p = _dma_getnextrxp(di, true)))
1078
brcmu_pkt_buf_free_skb(p);
1081
void dma_counterreset(struct dma_pub *pub)
1083
/* reset all software counters */
1089
/* get the address of the var in order to change later */
1090
unsigned long dma_getvar(struct dma_pub *pub, const char *name)
1092
struct dma_info *di = (struct dma_info *)pub;
1094
if (!strcmp(name, "&txavail"))
1095
return (unsigned long)&(di->dma.txavail);
1099
/* 64-bit DMA functions */
1101
void dma_txinit(struct dma_pub *pub)
1103
struct dma_info *di = (struct dma_info *)pub;
1104
u32 control = D64_XC_XE;
1106
DMA_TRACE(("%s: dma_txinit\n", di->name));
1111
di->txin = di->txout = 0;
1112
di->dma.txavail = di->ntxd - 1;
1114
/* clear tx descriptor ring */
1115
memset(di->txd64, '\0', (di->ntxd * sizeof(struct dma64desc)));
1117
/* DMA engine with out alignment requirement requires table to be inited
1118
* before enabling the engine
1120
if (!di->aligndesc_4k)
1121
_dma_ddtable_init(di, DMA_TX, di->txdpa);
1123
if ((di->dma.dmactrlflags & DMA_CTRL_PEN) == 0)
1124
control |= D64_XC_PD;
1125
OR_REG(&di->d64txregs->control, control);
1127
/* DMA engine with alignment requirement requires table to be inited
1128
* before enabling the engine
1130
if (di->aligndesc_4k)
1131
_dma_ddtable_init(di, DMA_TX, di->txdpa);
1134
void dma_txsuspend(struct dma_pub *pub)
1136
struct dma_info *di = (struct dma_info *)pub;
1138
DMA_TRACE(("%s: dma_txsuspend\n", di->name));
1143
OR_REG(&di->d64txregs->control, D64_XC_SE);
1146
void dma_txresume(struct dma_pub *pub)
1148
struct dma_info *di = (struct dma_info *)pub;
1150
DMA_TRACE(("%s: dma_txresume\n", di->name));
1155
AND_REG(&di->d64txregs->control, ~D64_XC_SE);
1158
bool dma_txsuspended(struct dma_pub *pub)
1160
struct dma_info *di = (struct dma_info *)pub;
1162
return (di->ntxd == 0) ||
1163
((R_REG(&di->d64txregs->control) & D64_XC_SE) ==
1167
void dma_txreclaim(struct dma_pub *pub, enum txd_range range)
1169
struct dma_info *di = (struct dma_info *)pub;
1172
DMA_TRACE(("%s: dma_txreclaim %s\n", di->name,
1173
(range == DMA_RANGE_ALL) ? "all" :
1175
DMA_RANGE_TRANSMITTED) ? "transmitted" :
1178
if (di->txin == di->txout)
1181
while ((p = dma_getnexttxp(pub, range))) {
1182
/* For unframed data, we don't have any packets to free */
1183
if (!(di->dma.dmactrlflags & DMA_CTRL_UNFRAMED))
1184
brcmu_pkt_buf_free_skb(p);
1188
bool dma_txreset(struct dma_pub *pub)
1190
struct dma_info *di = (struct dma_info *)pub;
1196
/* suspend tx DMA first */
1197
W_REG(&di->d64txregs->control, D64_XC_SE);
1199
(R_REG(&di->d64txregs->status0) & D64_XS0_XS_MASK))
1200
!= D64_XS0_XS_DISABLED) && (status != D64_XS0_XS_IDLE)
1201
&& (status != D64_XS0_XS_STOPPED), 10000);
1203
W_REG(&di->d64txregs->control, 0);
1205
(R_REG(&di->d64txregs->status0) & D64_XS0_XS_MASK))
1206
!= D64_XS0_XS_DISABLED), 10000);
1208
/* wait for the last transaction to complete */
1211
return status == D64_XS0_XS_DISABLED;
1214
bool dma_rxreset(struct dma_pub *pub)
1216
struct dma_info *di = (struct dma_info *)pub;
1222
W_REG(&di->d64rxregs->control, 0);
1224
(R_REG(&di->d64rxregs->status0) & D64_RS0_RS_MASK))
1225
!= D64_RS0_RS_DISABLED), 10000);
1227
return status == D64_RS0_RS_DISABLED;
1231
* !! tx entry routine
1232
* WARNING: call must check the return value for error.
1233
* the error(toss frames) could be fatal and cause many subsequent hard
1236
int dma_txfast(struct dma_pub *pub, struct sk_buff *p0, bool commit)
1238
struct dma_info *di = (struct dma_info *)pub;
1239
struct sk_buff *p, *next;
1240
unsigned char *data;
1246
DMA_TRACE(("%s: dma_txfast\n", di->name));
1251
* Walk the chain of packet buffers
1252
* allocating and initializing transmit descriptor entries.
1254
for (p = p0; p; p = next) {
1259
/* return nonzero if out of tx descriptors */
1260
if (nexttxd(di, txout) == di->txin)
1266
/* get physical address of buffer start */
1267
pa = pci_map_single(di->pbus, data, len, PCI_DMA_TODEVICE);
1271
flags |= D64_CTRL1_SOF;
1273
/* With a DMA segment list, Descriptor table is filled
1274
* using the segment list instead of looping over
1275
* buffers in multi-chain DMA. Therefore, EOF for SGLIST
1276
* is when end of segment list is reached.
1279
flags |= (D64_CTRL1_IOC | D64_CTRL1_EOF);
1280
if (txout == (di->ntxd - 1))
1281
flags |= D64_CTRL1_EOT;
1283
dma64_dd_upd(di, di->txd64, pa, txout, &flags, len);
1285
txout = nexttxd(di, txout);
1288
/* if last txd eof not set, fix it */
1289
if (!(flags & D64_CTRL1_EOF))
1290
di->txd64[prevtxd(di, txout)].ctrl1 =
1291
cpu_to_le32(flags | D64_CTRL1_IOC | D64_CTRL1_EOF);
1293
/* save the packet */
1294
di->txp[prevtxd(di, txout)] = p0;
1296
/* bump the tx descriptor index */
1301
W_REG(&di->d64txregs->ptr,
1302
di->xmtptrbase + I2B(txout, struct dma64desc));
1304
/* tx flow control */
1305
di->dma.txavail = di->ntxd - ntxdactive(di, di->txin, di->txout) - 1;
1310
DMA_ERROR(("%s: dma_txfast: out of txds !!!\n", di->name));
1311
brcmu_pkt_buf_free_skb(p0);
1312
di->dma.txavail = 0;
1318
* Reclaim next completed txd (txds if using chained buffers) in the range
1319
* specified and return associated packet.
1320
* If range is DMA_RANGE_TRANSMITTED, reclaim descriptors that have be
1321
* transmitted as noted by the hardware "CurrDescr" pointer.
1322
* If range is DMA_RANGE_TRANSFERED, reclaim descriptors that have be
1323
* transferred by the DMA as noted by the hardware "ActiveDescr" pointer.
1324
* If range is DMA_RANGE_ALL, reclaim all txd(s) posted to the ring and
1325
* return associated packet regardless of the value of hardware pointers.
1327
struct sk_buff *dma_getnexttxp(struct dma_pub *pub, enum txd_range range)
1329
struct dma_info *di = (struct dma_info *)pub;
1332
struct sk_buff *txp;
1334
DMA_TRACE(("%s: dma_getnexttxp %s\n", di->name,
1335
(range == DMA_RANGE_ALL) ? "all" :
1337
DMA_RANGE_TRANSMITTED) ? "transmitted" :
1346
if (range == DMA_RANGE_ALL)
1349
struct dma64regs __iomem *dregs = di->d64txregs;
1351
end = (u16) (B2I(((R_REG(&dregs->status0) &
1353
di->xmtptrbase) & D64_XS0_CD_MASK,
1356
if (range == DMA_RANGE_TRANSFERED) {
1358
(u16) (R_REG(&dregs->status1) &
1361
(active_desc - di->xmtptrbase) & D64_XS0_CD_MASK;
1362
active_desc = B2I(active_desc, struct dma64desc);
1363
if (end != active_desc)
1364
end = prevtxd(di, active_desc);
1368
if ((start == 0) && (end > di->txout))
1371
for (i = start; i != end && !txp; i = nexttxd(di, i)) {
1375
pa = le32_to_cpu(di->txd64[i].addrlow) - di->dataoffsetlow;
1378
(le32_to_cpu(di->txd64[i].ctrl2) &
1381
di->txd64[i].addrlow = cpu_to_le32(0xdeadbeef);
1382
di->txd64[i].addrhigh = cpu_to_le32(0xdeadbeef);
1387
pci_unmap_single(di->pbus, pa, size, PCI_DMA_TODEVICE);
1392
/* tx flow control */
1393
di->dma.txavail = di->ntxd - ntxdactive(di, di->txin, di->txout) - 1;
1398
DMA_NONE(("dma_getnexttxp: bogus curr: start %d end %d txout %d "
1399
"force %d\n", start, end, di->txout, forceall));
1404
* Mac80211 initiated actions sometimes require packets in the DMA queue to be
1405
* modified. The modified portion of the packet is not under control of the DMA
1406
* engine. This function calls a caller-supplied function for each packet in
1407
* the caller specified dma chain.
1409
void dma_walk_packets(struct dma_pub *dmah, void (*callback_fnc)
1410
(void *pkt, void *arg_a), void *arg_a)
1412
struct dma_info *di = (struct dma_info *) dmah;
1414
uint end = di->txout;
1415
struct sk_buff *skb;
1416
struct ieee80211_tx_info *tx_info;
1419
skb = (struct sk_buff *)di->txp[i];
1421
tx_info = (struct ieee80211_tx_info *)skb->cb;
1422
(callback_fnc)(tx_info, arg_a);