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