mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 09:36:25 +00:00
8e118f0ed8
This checks if the DMA address is bigger than what the controller can manage. It will reallocate the buffers in the GFP_DMA zone in that case. The patch by Michael Buesch has been ported to b43legacy. Thanks to Matti Viljanen for reporting this. Cc: Matti Viljanen <viljanen.matti@gmail.com> Signed-off-by: Stefano Brivio <stefano.brivio@polimi.it> Signed-off-by: John W. Linville <linville@tuxdriver.com>
351 lines
11 KiB
C
351 lines
11 KiB
C
#ifndef B43legacy_DMA_H_
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#define B43legacy_DMA_H_
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#include <linux/list.h>
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#include <linux/spinlock.h>
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#include <linux/workqueue.h>
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#include <linux/linkage.h>
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#include <asm/atomic.h>
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#include "b43legacy.h"
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/* DMA-Interrupt reasons. */
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#define B43legacy_DMAIRQ_FATALMASK ((1 << 10) | (1 << 11) | (1 << 12) \
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| (1 << 14) | (1 << 15))
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#define B43legacy_DMAIRQ_NONFATALMASK (1 << 13)
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#define B43legacy_DMAIRQ_RX_DONE (1 << 16)
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/*** 32-bit DMA Engine. ***/
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/* 32-bit DMA controller registers. */
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#define B43legacy_DMA32_TXCTL 0x00
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#define B43legacy_DMA32_TXENABLE 0x00000001
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#define B43legacy_DMA32_TXSUSPEND 0x00000002
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#define B43legacy_DMA32_TXLOOPBACK 0x00000004
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#define B43legacy_DMA32_TXFLUSH 0x00000010
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#define B43legacy_DMA32_TXADDREXT_MASK 0x00030000
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#define B43legacy_DMA32_TXADDREXT_SHIFT 16
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#define B43legacy_DMA32_TXRING 0x04
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#define B43legacy_DMA32_TXINDEX 0x08
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#define B43legacy_DMA32_TXSTATUS 0x0C
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#define B43legacy_DMA32_TXDPTR 0x00000FFF
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#define B43legacy_DMA32_TXSTATE 0x0000F000
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#define B43legacy_DMA32_TXSTAT_DISABLED 0x00000000
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#define B43legacy_DMA32_TXSTAT_ACTIVE 0x00001000
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#define B43legacy_DMA32_TXSTAT_IDLEWAIT 0x00002000
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#define B43legacy_DMA32_TXSTAT_STOPPED 0x00003000
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#define B43legacy_DMA32_TXSTAT_SUSP 0x00004000
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#define B43legacy_DMA32_TXERROR 0x000F0000
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#define B43legacy_DMA32_TXERR_NOERR 0x00000000
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#define B43legacy_DMA32_TXERR_PROT 0x00010000
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#define B43legacy_DMA32_TXERR_UNDERRUN 0x00020000
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#define B43legacy_DMA32_TXERR_BUFREAD 0x00030000
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#define B43legacy_DMA32_TXERR_DESCREAD 0x00040000
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#define B43legacy_DMA32_TXACTIVE 0xFFF00000
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#define B43legacy_DMA32_RXCTL 0x10
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#define B43legacy_DMA32_RXENABLE 0x00000001
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#define B43legacy_DMA32_RXFROFF_MASK 0x000000FE
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#define B43legacy_DMA32_RXFROFF_SHIFT 1
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#define B43legacy_DMA32_RXDIRECTFIFO 0x00000100
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#define B43legacy_DMA32_RXADDREXT_MASK 0x00030000
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#define B43legacy_DMA32_RXADDREXT_SHIFT 16
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#define B43legacy_DMA32_RXRING 0x14
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#define B43legacy_DMA32_RXINDEX 0x18
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#define B43legacy_DMA32_RXSTATUS 0x1C
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#define B43legacy_DMA32_RXDPTR 0x00000FFF
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#define B43legacy_DMA32_RXSTATE 0x0000F000
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#define B43legacy_DMA32_RXSTAT_DISABLED 0x00000000
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#define B43legacy_DMA32_RXSTAT_ACTIVE 0x00001000
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#define B43legacy_DMA32_RXSTAT_IDLEWAIT 0x00002000
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#define B43legacy_DMA32_RXSTAT_STOPPED 0x00003000
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#define B43legacy_DMA32_RXERROR 0x000F0000
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#define B43legacy_DMA32_RXERR_NOERR 0x00000000
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#define B43legacy_DMA32_RXERR_PROT 0x00010000
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#define B43legacy_DMA32_RXERR_OVERFLOW 0x00020000
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#define B43legacy_DMA32_RXERR_BUFWRITE 0x00030000
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#define B43legacy_DMA32_RXERR_DESCREAD 0x00040000
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#define B43legacy_DMA32_RXACTIVE 0xFFF00000
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/* 32-bit DMA descriptor. */
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struct b43legacy_dmadesc32 {
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__le32 control;
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__le32 address;
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} __attribute__((__packed__));
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#define B43legacy_DMA32_DCTL_BYTECNT 0x00001FFF
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#define B43legacy_DMA32_DCTL_ADDREXT_MASK 0x00030000
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#define B43legacy_DMA32_DCTL_ADDREXT_SHIFT 16
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#define B43legacy_DMA32_DCTL_DTABLEEND 0x10000000
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#define B43legacy_DMA32_DCTL_IRQ 0x20000000
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#define B43legacy_DMA32_DCTL_FRAMEEND 0x40000000
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#define B43legacy_DMA32_DCTL_FRAMESTART 0x80000000
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/*** 64-bit DMA Engine. ***/
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/* 64-bit DMA controller registers. */
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#define B43legacy_DMA64_TXCTL 0x00
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#define B43legacy_DMA64_TXENABLE 0x00000001
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#define B43legacy_DMA64_TXSUSPEND 0x00000002
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#define B43legacy_DMA64_TXLOOPBACK 0x00000004
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#define B43legacy_DMA64_TXFLUSH 0x00000010
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#define B43legacy_DMA64_TXADDREXT_MASK 0x00030000
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#define B43legacy_DMA64_TXADDREXT_SHIFT 16
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#define B43legacy_DMA64_TXINDEX 0x04
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#define B43legacy_DMA64_TXRINGLO 0x08
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#define B43legacy_DMA64_TXRINGHI 0x0C
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#define B43legacy_DMA64_TXSTATUS 0x10
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#define B43legacy_DMA64_TXSTATDPTR 0x00001FFF
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#define B43legacy_DMA64_TXSTAT 0xF0000000
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#define B43legacy_DMA64_TXSTAT_DISABLED 0x00000000
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#define B43legacy_DMA64_TXSTAT_ACTIVE 0x10000000
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#define B43legacy_DMA64_TXSTAT_IDLEWAIT 0x20000000
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#define B43legacy_DMA64_TXSTAT_STOPPED 0x30000000
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#define B43legacy_DMA64_TXSTAT_SUSP 0x40000000
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#define B43legacy_DMA64_TXERROR 0x14
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#define B43legacy_DMA64_TXERRDPTR 0x0001FFFF
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#define B43legacy_DMA64_TXERR 0xF0000000
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#define B43legacy_DMA64_TXERR_NOERR 0x00000000
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#define B43legacy_DMA64_TXERR_PROT 0x10000000
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#define B43legacy_DMA64_TXERR_UNDERRUN 0x20000000
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#define B43legacy_DMA64_TXERR_TRANSFER 0x30000000
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#define B43legacy_DMA64_TXERR_DESCREAD 0x40000000
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#define B43legacy_DMA64_TXERR_CORE 0x50000000
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#define B43legacy_DMA64_RXCTL 0x20
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#define B43legacy_DMA64_RXENABLE 0x00000001
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#define B43legacy_DMA64_RXFROFF_MASK 0x000000FE
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#define B43legacy_DMA64_RXFROFF_SHIFT 1
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#define B43legacy_DMA64_RXDIRECTFIFO 0x00000100
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#define B43legacy_DMA64_RXADDREXT_MASK 0x00030000
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#define B43legacy_DMA64_RXADDREXT_SHIFT 16
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#define B43legacy_DMA64_RXINDEX 0x24
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#define B43legacy_DMA64_RXRINGLO 0x28
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#define B43legacy_DMA64_RXRINGHI 0x2C
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#define B43legacy_DMA64_RXSTATUS 0x30
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#define B43legacy_DMA64_RXSTATDPTR 0x00001FFF
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#define B43legacy_DMA64_RXSTAT 0xF0000000
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#define B43legacy_DMA64_RXSTAT_DISABLED 0x00000000
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#define B43legacy_DMA64_RXSTAT_ACTIVE 0x10000000
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#define B43legacy_DMA64_RXSTAT_IDLEWAIT 0x20000000
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#define B43legacy_DMA64_RXSTAT_STOPPED 0x30000000
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#define B43legacy_DMA64_RXSTAT_SUSP 0x40000000
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#define B43legacy_DMA64_RXERROR 0x34
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#define B43legacy_DMA64_RXERRDPTR 0x0001FFFF
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#define B43legacy_DMA64_RXERR 0xF0000000
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#define B43legacy_DMA64_RXERR_NOERR 0x00000000
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#define B43legacy_DMA64_RXERR_PROT 0x10000000
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#define B43legacy_DMA64_RXERR_UNDERRUN 0x20000000
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#define B43legacy_DMA64_RXERR_TRANSFER 0x30000000
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#define B43legacy_DMA64_RXERR_DESCREAD 0x40000000
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#define B43legacy_DMA64_RXERR_CORE 0x50000000
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/* 64-bit DMA descriptor. */
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struct b43legacy_dmadesc64 {
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__le32 control0;
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__le32 control1;
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__le32 address_low;
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__le32 address_high;
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} __attribute__((__packed__));
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#define B43legacy_DMA64_DCTL0_DTABLEEND 0x10000000
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#define B43legacy_DMA64_DCTL0_IRQ 0x20000000
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#define B43legacy_DMA64_DCTL0_FRAMEEND 0x40000000
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#define B43legacy_DMA64_DCTL0_FRAMESTART 0x80000000
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#define B43legacy_DMA64_DCTL1_BYTECNT 0x00001FFF
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#define B43legacy_DMA64_DCTL1_ADDREXT_MASK 0x00030000
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#define B43legacy_DMA64_DCTL1_ADDREXT_SHIFT 16
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struct b43legacy_dmadesc_generic {
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union {
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struct b43legacy_dmadesc32 dma32;
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struct b43legacy_dmadesc64 dma64;
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} __attribute__((__packed__));
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} __attribute__((__packed__));
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/* Misc DMA constants */
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#define B43legacy_DMA_RINGMEMSIZE PAGE_SIZE
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#define B43legacy_DMA0_RX_FRAMEOFFSET 30
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#define B43legacy_DMA3_RX_FRAMEOFFSET 0
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/* DMA engine tuning knobs */
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#define B43legacy_TXRING_SLOTS 128
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#define B43legacy_RXRING_SLOTS 64
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#define B43legacy_DMA0_RX_BUFFERSIZE (2304 + 100)
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#define B43legacy_DMA3_RX_BUFFERSIZE 16
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#ifdef CONFIG_B43LEGACY_DMA
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struct sk_buff;
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struct b43legacy_private;
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struct b43legacy_txstatus;
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struct b43legacy_dmadesc_meta {
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/* The kernel DMA-able buffer. */
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struct sk_buff *skb;
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/* DMA base bus-address of the descriptor buffer. */
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dma_addr_t dmaaddr;
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/* ieee80211 TX status. Only used once per 802.11 frag. */
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bool is_last_fragment;
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struct ieee80211_tx_status txstat;
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};
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struct b43legacy_dmaring;
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/* Lowlevel DMA operations that differ between 32bit and 64bit DMA. */
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struct b43legacy_dma_ops {
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struct b43legacy_dmadesc_generic * (*idx2desc)
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(struct b43legacy_dmaring *ring,
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int slot,
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struct b43legacy_dmadesc_meta
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**meta);
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void (*fill_descriptor)(struct b43legacy_dmaring *ring,
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struct b43legacy_dmadesc_generic *desc,
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dma_addr_t dmaaddr, u16 bufsize,
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int start, int end, int irq);
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void (*poke_tx)(struct b43legacy_dmaring *ring, int slot);
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void (*tx_suspend)(struct b43legacy_dmaring *ring);
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void (*tx_resume)(struct b43legacy_dmaring *ring);
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int (*get_current_rxslot)(struct b43legacy_dmaring *ring);
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void (*set_current_rxslot)(struct b43legacy_dmaring *ring, int slot);
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};
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enum b43legacy_dmatype {
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B43legacy_DMA_30BIT = 30,
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B43legacy_DMA_32BIT = 32,
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B43legacy_DMA_64BIT = 64,
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};
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struct b43legacy_dmaring {
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/* Lowlevel DMA ops. */
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const struct b43legacy_dma_ops *ops;
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/* Kernel virtual base address of the ring memory. */
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void *descbase;
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/* Meta data about all descriptors. */
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struct b43legacy_dmadesc_meta *meta;
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/* Cache of TX headers for each slot.
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* This is to avoid an allocation on each TX.
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* This is NULL for an RX ring.
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*/
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u8 *txhdr_cache;
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/* (Unadjusted) DMA base bus-address of the ring memory. */
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dma_addr_t dmabase;
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/* Number of descriptor slots in the ring. */
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int nr_slots;
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/* Number of used descriptor slots. */
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int used_slots;
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/* Currently used slot in the ring. */
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int current_slot;
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/* Total number of packets sent. Statistics only. */
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unsigned int nr_tx_packets;
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/* Frameoffset in octets. */
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u32 frameoffset;
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/* Descriptor buffer size. */
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u16 rx_buffersize;
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/* The MMIO base register of the DMA controller. */
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u16 mmio_base;
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/* DMA controller index number (0-5). */
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int index;
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/* Boolean. Is this a TX ring? */
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bool tx;
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/* The type of DMA engine used. */
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enum b43legacy_dmatype type;
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/* Boolean. Is this ring stopped at ieee80211 level? */
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bool stopped;
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/* Lock, only used for TX. */
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spinlock_t lock;
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struct b43legacy_wldev *dev;
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#ifdef CONFIG_B43LEGACY_DEBUG
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/* Maximum number of used slots. */
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int max_used_slots;
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/* Last time we injected a ring overflow. */
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unsigned long last_injected_overflow;
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#endif /* CONFIG_B43LEGACY_DEBUG*/
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};
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static inline
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u32 b43legacy_dma_read(struct b43legacy_dmaring *ring,
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u16 offset)
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{
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return b43legacy_read32(ring->dev, ring->mmio_base + offset);
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}
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static inline
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void b43legacy_dma_write(struct b43legacy_dmaring *ring,
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u16 offset, u32 value)
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{
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b43legacy_write32(ring->dev, ring->mmio_base + offset, value);
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}
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int b43legacy_dma_init(struct b43legacy_wldev *dev);
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void b43legacy_dma_free(struct b43legacy_wldev *dev);
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void b43legacy_dma_tx_suspend(struct b43legacy_wldev *dev);
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void b43legacy_dma_tx_resume(struct b43legacy_wldev *dev);
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void b43legacy_dma_get_tx_stats(struct b43legacy_wldev *dev,
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struct ieee80211_tx_queue_stats *stats);
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int b43legacy_dma_tx(struct b43legacy_wldev *dev,
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struct sk_buff *skb,
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struct ieee80211_tx_control *ctl);
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void b43legacy_dma_handle_txstatus(struct b43legacy_wldev *dev,
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const struct b43legacy_txstatus *status);
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void b43legacy_dma_rx(struct b43legacy_dmaring *ring);
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#else /* CONFIG_B43LEGACY_DMA */
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static inline
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int b43legacy_dma_init(struct b43legacy_wldev *dev)
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{
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return 0;
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}
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static inline
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void b43legacy_dma_free(struct b43legacy_wldev *dev)
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{
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}
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static inline
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void b43legacy_dma_get_tx_stats(struct b43legacy_wldev *dev,
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struct ieee80211_tx_queue_stats *stats)
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{
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}
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static inline
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int b43legacy_dma_tx(struct b43legacy_wldev *dev,
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struct sk_buff *skb,
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struct ieee80211_tx_control *ctl)
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{
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return 0;
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}
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static inline
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void b43legacy_dma_handle_txstatus(struct b43legacy_wldev *dev,
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const struct b43legacy_txstatus *status)
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{
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}
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static inline
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void b43legacy_dma_rx(struct b43legacy_dmaring *ring)
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{
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}
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static inline
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void b43legacy_dma_tx_suspend(struct b43legacy_wldev *dev)
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{
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}
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static inline
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void b43legacy_dma_tx_resume(struct b43legacy_wldev *dev)
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{
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}
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#endif /* CONFIG_B43LEGACY_DMA */
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#endif /* B43legacy_DMA_H_ */
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