233 lines
6.4 KiB
C
233 lines
6.4 KiB
C
/*
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* Driver for the Intel integrated DMA 64-bit
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*
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* Copyright (C) 2015 Intel Corporation
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#ifndef __DMA_IDMA64_H__
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#define __DMA_IDMA64_H__
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#include <linux/device.h>
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#include <linux/io.h>
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#include <linux/spinlock.h>
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#include <linux/types.h>
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#include <linux/io-64-nonatomic-lo-hi.h>
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#include "virt-dma.h"
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/* Channel registers */
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#define IDMA64_CH_SAR 0x00 /* Source Address Register */
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#define IDMA64_CH_DAR 0x08 /* Destination Address Register */
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#define IDMA64_CH_LLP 0x10 /* Linked List Pointer */
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#define IDMA64_CH_CTL_LO 0x18 /* Control Register Low */
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#define IDMA64_CH_CTL_HI 0x1c /* Control Register High */
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#define IDMA64_CH_SSTAT 0x20
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#define IDMA64_CH_DSTAT 0x28
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#define IDMA64_CH_SSTATAR 0x30
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#define IDMA64_CH_DSTATAR 0x38
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#define IDMA64_CH_CFG_LO 0x40 /* Configuration Register Low */
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#define IDMA64_CH_CFG_HI 0x44 /* Configuration Register High */
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#define IDMA64_CH_SGR 0x48
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#define IDMA64_CH_DSR 0x50
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#define IDMA64_CH_LENGTH 0x58
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/* Bitfields in CTL_LO */
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#define IDMA64C_CTLL_INT_EN (1 << 0) /* irqs enabled? */
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#define IDMA64C_CTLL_DST_WIDTH(x) ((x) << 1) /* bytes per element */
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#define IDMA64C_CTLL_SRC_WIDTH(x) ((x) << 4)
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#define IDMA64C_CTLL_DST_INC (0 << 8) /* DAR update/not */
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#define IDMA64C_CTLL_DST_FIX (1 << 8)
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#define IDMA64C_CTLL_SRC_INC (0 << 10) /* SAR update/not */
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#define IDMA64C_CTLL_SRC_FIX (1 << 10)
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#define IDMA64C_CTLL_DST_MSIZE(x) ((x) << 11) /* burst, #elements */
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#define IDMA64C_CTLL_SRC_MSIZE(x) ((x) << 14)
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#define IDMA64C_CTLL_FC_M2P (1 << 20) /* mem-to-periph */
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#define IDMA64C_CTLL_FC_P2M (2 << 20) /* periph-to-mem */
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#define IDMA64C_CTLL_LLP_D_EN (1 << 27) /* dest block chain */
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#define IDMA64C_CTLL_LLP_S_EN (1 << 28) /* src block chain */
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/* Bitfields in CTL_HI */
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#define IDMA64C_CTLH_BLOCK_TS_MASK ((1 << 17) - 1)
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#define IDMA64C_CTLH_BLOCK_TS(x) ((x) & IDMA64C_CTLH_BLOCK_TS_MASK)
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#define IDMA64C_CTLH_DONE (1 << 17)
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/* Bitfields in CFG_LO */
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#define IDMA64C_CFGL_DST_BURST_ALIGN (1 << 0) /* dst burst align */
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#define IDMA64C_CFGL_SRC_BURST_ALIGN (1 << 1) /* src burst align */
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#define IDMA64C_CFGL_CH_SUSP (1 << 8)
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#define IDMA64C_CFGL_FIFO_EMPTY (1 << 9)
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#define IDMA64C_CFGL_CH_DRAIN (1 << 10) /* drain FIFO */
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#define IDMA64C_CFGL_DST_OPT_BL (1 << 20) /* optimize dst burst length */
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#define IDMA64C_CFGL_SRC_OPT_BL (1 << 21) /* optimize src burst length */
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/* Bitfields in CFG_HI */
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#define IDMA64C_CFGH_SRC_PER(x) ((x) << 0) /* src peripheral */
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#define IDMA64C_CFGH_DST_PER(x) ((x) << 4) /* dst peripheral */
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#define IDMA64C_CFGH_RD_ISSUE_THD(x) ((x) << 8)
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#define IDMA64C_CFGH_WR_ISSUE_THD(x) ((x) << 18)
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/* Interrupt registers */
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#define IDMA64_INT_XFER 0x00
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#define IDMA64_INT_BLOCK 0x08
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#define IDMA64_INT_SRC_TRAN 0x10
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#define IDMA64_INT_DST_TRAN 0x18
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#define IDMA64_INT_ERROR 0x20
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#define IDMA64_RAW(x) (0x2c0 + IDMA64_INT_##x) /* r */
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#define IDMA64_STATUS(x) (0x2e8 + IDMA64_INT_##x) /* r (raw & mask) */
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#define IDMA64_MASK(x) (0x310 + IDMA64_INT_##x) /* rw (set = irq enabled) */
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#define IDMA64_CLEAR(x) (0x338 + IDMA64_INT_##x) /* w (ack, affects "raw") */
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/* Common registers */
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#define IDMA64_STATUS_INT 0x360 /* r */
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#define IDMA64_CFG 0x398
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#define IDMA64_CH_EN 0x3a0
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/* Bitfields in CFG */
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#define IDMA64_CFG_DMA_EN (1 << 0)
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/* Hardware descriptor for Linked LIst transfers */
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struct idma64_lli {
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u64 sar;
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u64 dar;
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u64 llp;
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u32 ctllo;
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u32 ctlhi;
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u32 sstat;
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u32 dstat;
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};
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struct idma64_hw_desc {
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struct idma64_lli *lli;
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dma_addr_t llp;
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dma_addr_t phys;
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unsigned int len;
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};
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struct idma64_desc {
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struct virt_dma_desc vdesc;
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enum dma_transfer_direction direction;
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struct idma64_hw_desc *hw;
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unsigned int ndesc;
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size_t length;
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enum dma_status status;
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};
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static inline struct idma64_desc *to_idma64_desc(struct virt_dma_desc *vdesc)
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{
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return container_of(vdesc, struct idma64_desc, vdesc);
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}
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struct idma64_chan {
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struct virt_dma_chan vchan;
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void __iomem *regs;
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/* hardware configuration */
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enum dma_transfer_direction direction;
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unsigned int mask;
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struct dma_slave_config config;
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void *pool;
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struct idma64_desc *desc;
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};
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static inline struct idma64_chan *to_idma64_chan(struct dma_chan *chan)
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{
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return container_of(chan, struct idma64_chan, vchan.chan);
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}
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#define channel_set_bit(idma64, reg, mask) \
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dma_writel(idma64, reg, ((mask) << 8) | (mask))
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#define channel_clear_bit(idma64, reg, mask) \
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dma_writel(idma64, reg, ((mask) << 8) | 0)
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static inline u32 idma64c_readl(struct idma64_chan *idma64c, int offset)
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{
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return readl(idma64c->regs + offset);
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}
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static inline void idma64c_writel(struct idma64_chan *idma64c, int offset,
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u32 value)
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{
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writel(value, idma64c->regs + offset);
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}
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#define channel_readl(idma64c, reg) \
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idma64c_readl(idma64c, IDMA64_CH_##reg)
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#define channel_writel(idma64c, reg, value) \
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idma64c_writel(idma64c, IDMA64_CH_##reg, (value))
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static inline u64 idma64c_readq(struct idma64_chan *idma64c, int offset)
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{
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return lo_hi_readq(idma64c->regs + offset);
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}
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static inline void idma64c_writeq(struct idma64_chan *idma64c, int offset,
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u64 value)
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{
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lo_hi_writeq(value, idma64c->regs + offset);
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}
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#define channel_readq(idma64c, reg) \
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idma64c_readq(idma64c, IDMA64_CH_##reg)
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#define channel_writeq(idma64c, reg, value) \
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idma64c_writeq(idma64c, IDMA64_CH_##reg, (value))
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struct idma64 {
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struct dma_device dma;
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void __iomem *regs;
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/* channels */
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unsigned short all_chan_mask;
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struct idma64_chan *chan;
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};
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static inline struct idma64 *to_idma64(struct dma_device *ddev)
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{
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return container_of(ddev, struct idma64, dma);
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}
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static inline u32 idma64_readl(struct idma64 *idma64, int offset)
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{
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return readl(idma64->regs + offset);
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}
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static inline void idma64_writel(struct idma64 *idma64, int offset, u32 value)
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{
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writel(value, idma64->regs + offset);
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}
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#define dma_readl(idma64, reg) \
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idma64_readl(idma64, IDMA64_##reg)
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#define dma_writel(idma64, reg, value) \
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idma64_writel(idma64, IDMA64_##reg, (value))
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/**
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* struct idma64_chip - representation of iDMA 64-bit controller hardware
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* @dev: struct device of the DMA controller
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* @sysdev: struct device of the physical device that does DMA
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* @irq: irq line
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* @regs: memory mapped I/O space
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* @idma64: struct idma64 that is filed by idma64_probe()
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*/
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struct idma64_chip {
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struct device *dev;
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struct device *sysdev;
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int irq;
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void __iomem *regs;
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struct idma64 *idma64;
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};
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#endif /* __DMA_IDMA64_H__ */
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