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Diffstat (limited to 'drivers/dma/txx9dmac.h')
| -rw-r--r-- | drivers/dma/txx9dmac.h | 307 |
1 files changed, 307 insertions, 0 deletions
diff --git a/drivers/dma/txx9dmac.h b/drivers/dma/txx9dmac.h new file mode 100644 index 000000000..f6517b928 --- /dev/null +++ b/drivers/dma/txx9dmac.h @@ -0,0 +1,307 @@ +/* + * Driver for the TXx9 SoC DMA Controller + * + * Copyright (C) 2009 Atsushi Nemoto + * + * 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 TXX9DMAC_H +#define TXX9DMAC_H + +#include <linux/dmaengine.h> +#include <asm/txx9/dmac.h> + +/* + * Design Notes: + * + * This DMAC have four channels and one FIFO buffer. Each channel can + * be configured for memory-memory or device-memory transfer, but only + * one channel can do alignment-free memory-memory transfer at a time + * while the channel should occupy the FIFO buffer for effective + * transfers. + * + * Instead of dynamically assign the FIFO buffer to channels, I chose + * make one dedicated channel for memory-memory transfer. The + * dedicated channel is public. Other channels are private and used + * for slave transfer. Some devices in the SoC are wired to certain + * DMA channel. + */ + +#ifdef CONFIG_MACH_TX49XX +static inline bool txx9_dma_have_SMPCHN(void) +{ + return true; +} +#define TXX9_DMA_USE_SIMPLE_CHAIN +#else +static inline bool txx9_dma_have_SMPCHN(void) +{ + return false; +} +#endif + +#ifdef __LITTLE_ENDIAN +#ifdef CONFIG_MACH_TX49XX +#define CCR_LE TXX9_DMA_CCR_LE +#define MCR_LE 0 +#else +#define CCR_LE 0 +#define MCR_LE TXX9_DMA_MCR_LE +#endif +#else +#define CCR_LE 0 +#define MCR_LE 0 +#endif + +/* + * Redefine this macro to handle differences between 32- and 64-bit + * addressing, big vs. little endian, etc. + */ +#ifdef __BIG_ENDIAN +#define TXX9_DMA_REG32(name) u32 __pad_##name; u32 name +#else +#define TXX9_DMA_REG32(name) u32 name; u32 __pad_##name +#endif + +/* Hardware register definitions. */ +struct txx9dmac_cregs { +#if defined(CONFIG_32BIT) && !defined(CONFIG_PHYS_ADDR_T_64BIT) + TXX9_DMA_REG32(CHAR); /* Chain Address Register */ +#else + u64 CHAR; /* Chain Address Register */ +#endif + u64 SAR; /* Source Address Register */ + u64 DAR; /* Destination Address Register */ + TXX9_DMA_REG32(CNTR); /* Count Register */ + TXX9_DMA_REG32(SAIR); /* Source Address Increment Register */ + TXX9_DMA_REG32(DAIR); /* Destination Address Increment Register */ + TXX9_DMA_REG32(CCR); /* Channel Control Register */ + TXX9_DMA_REG32(CSR); /* Channel Status Register */ +}; +struct txx9dmac_cregs32 { + u32 CHAR; + u32 SAR; + u32 DAR; + u32 CNTR; + u32 SAIR; + u32 DAIR; + u32 CCR; + u32 CSR; +}; + +struct txx9dmac_regs { + /* per-channel registers */ + struct txx9dmac_cregs CHAN[TXX9_DMA_MAX_NR_CHANNELS]; + u64 __pad[9]; + u64 MFDR; /* Memory Fill Data Register */ + TXX9_DMA_REG32(MCR); /* Master Control Register */ +}; +struct txx9dmac_regs32 { + struct txx9dmac_cregs32 CHAN[TXX9_DMA_MAX_NR_CHANNELS]; + u32 __pad[9]; + u32 MFDR; + u32 MCR; +}; + +/* bits for MCR */ +#define TXX9_DMA_MCR_EIS(ch) (0x10000000<<(ch)) +#define TXX9_DMA_MCR_DIS(ch) (0x01000000<<(ch)) +#define TXX9_DMA_MCR_RSFIF 0x00000080 +#define TXX9_DMA_MCR_FIFUM(ch) (0x00000008<<(ch)) +#define TXX9_DMA_MCR_LE 0x00000004 +#define TXX9_DMA_MCR_RPRT 0x00000002 +#define TXX9_DMA_MCR_MSTEN 0x00000001 + +/* bits for CCRn */ +#define TXX9_DMA_CCR_IMMCHN 0x20000000 +#define TXX9_DMA_CCR_USEXFSZ 0x10000000 +#define TXX9_DMA_CCR_LE 0x08000000 +#define TXX9_DMA_CCR_DBINH 0x04000000 +#define TXX9_DMA_CCR_SBINH 0x02000000 +#define TXX9_DMA_CCR_CHRST 0x01000000 +#define TXX9_DMA_CCR_RVBYTE 0x00800000 +#define TXX9_DMA_CCR_ACKPOL 0x00400000 +#define TXX9_DMA_CCR_REQPL 0x00200000 +#define TXX9_DMA_CCR_EGREQ 0x00100000 +#define TXX9_DMA_CCR_CHDN 0x00080000 +#define TXX9_DMA_CCR_DNCTL 0x00060000 +#define TXX9_DMA_CCR_EXTRQ 0x00010000 +#define TXX9_DMA_CCR_INTRQD 0x0000e000 +#define TXX9_DMA_CCR_INTENE 0x00001000 +#define TXX9_DMA_CCR_INTENC 0x00000800 +#define TXX9_DMA_CCR_INTENT 0x00000400 +#define TXX9_DMA_CCR_CHNEN 0x00000200 +#define TXX9_DMA_CCR_XFACT 0x00000100 +#define TXX9_DMA_CCR_SMPCHN 0x00000020 +#define TXX9_DMA_CCR_XFSZ(order) (((order) << 2) & 0x0000001c) +#define TXX9_DMA_CCR_XFSZ_1 TXX9_DMA_CCR_XFSZ(0) +#define TXX9_DMA_CCR_XFSZ_2 TXX9_DMA_CCR_XFSZ(1) +#define TXX9_DMA_CCR_XFSZ_4 TXX9_DMA_CCR_XFSZ(2) +#define TXX9_DMA_CCR_XFSZ_8 TXX9_DMA_CCR_XFSZ(3) +#define TXX9_DMA_CCR_XFSZ_X4 TXX9_DMA_CCR_XFSZ(4) +#define TXX9_DMA_CCR_XFSZ_X8 TXX9_DMA_CCR_XFSZ(5) +#define TXX9_DMA_CCR_XFSZ_X16 TXX9_DMA_CCR_XFSZ(6) +#define TXX9_DMA_CCR_XFSZ_X32 TXX9_DMA_CCR_XFSZ(7) +#define TXX9_DMA_CCR_MEMIO 0x00000002 +#define TXX9_DMA_CCR_SNGAD 0x00000001 + +/* bits for CSRn */ +#define TXX9_DMA_CSR_CHNEN 0x00000400 +#define TXX9_DMA_CSR_STLXFER 0x00000200 +#define TXX9_DMA_CSR_XFACT 0x00000100 +#define TXX9_DMA_CSR_ABCHC 0x00000080 +#define TXX9_DMA_CSR_NCHNC 0x00000040 +#define TXX9_DMA_CSR_NTRNFC 0x00000020 +#define TXX9_DMA_CSR_EXTDN 0x00000010 +#define TXX9_DMA_CSR_CFERR 0x00000008 +#define TXX9_DMA_CSR_CHERR 0x00000004 +#define TXX9_DMA_CSR_DESERR 0x00000002 +#define TXX9_DMA_CSR_SORERR 0x00000001 + +struct txx9dmac_chan { + struct dma_chan chan; + struct dma_device dma; + struct txx9dmac_dev *ddev; + void __iomem *ch_regs; + struct tasklet_struct tasklet; + int irq; + u32 ccr; + + spinlock_t lock; + + /* these other elements are all protected by lock */ + struct list_head active_list; + struct list_head queue; + struct list_head free_list; + + unsigned int descs_allocated; +}; + +struct txx9dmac_dev { + void __iomem *regs; + struct tasklet_struct tasklet; + int irq; + struct txx9dmac_chan *chan[TXX9_DMA_MAX_NR_CHANNELS]; + bool have_64bit_regs; + unsigned int descsize; +}; + +static inline bool __is_dmac64(const struct txx9dmac_dev *ddev) +{ + return ddev->have_64bit_regs; +} + +static inline bool is_dmac64(const struct txx9dmac_chan *dc) +{ + return __is_dmac64(dc->ddev); +} + +#ifdef TXX9_DMA_USE_SIMPLE_CHAIN +/* Hardware descriptor definition. (for simple-chain) */ +struct txx9dmac_hwdesc { +#if defined(CONFIG_32BIT) && !defined(CONFIG_PHYS_ADDR_T_64BIT) + TXX9_DMA_REG32(CHAR); +#else + u64 CHAR; +#endif + u64 SAR; + u64 DAR; + TXX9_DMA_REG32(CNTR); +}; +struct txx9dmac_hwdesc32 { + u32 CHAR; + u32 SAR; + u32 DAR; + u32 CNTR; +}; +#else +#define txx9dmac_hwdesc txx9dmac_cregs +#define txx9dmac_hwdesc32 txx9dmac_cregs32 +#endif + +struct txx9dmac_desc { + /* FIRST values the hardware uses */ + union { + struct txx9dmac_hwdesc hwdesc; + struct txx9dmac_hwdesc32 hwdesc32; + }; + + /* THEN values for driver housekeeping */ + struct list_head desc_node ____cacheline_aligned; + struct list_head tx_list; + struct dma_async_tx_descriptor txd; + size_t len; +}; + +#ifdef TXX9_DMA_USE_SIMPLE_CHAIN + +static inline bool txx9dmac_chan_INTENT(struct txx9dmac_chan *dc) +{ + return (dc->ccr & TXX9_DMA_CCR_INTENT) != 0; +} + +static inline void txx9dmac_chan_set_INTENT(struct txx9dmac_chan *dc) +{ + dc->ccr |= TXX9_DMA_CCR_INTENT; +} + +static inline void txx9dmac_desc_set_INTENT(struct txx9dmac_dev *ddev, + struct txx9dmac_desc *desc) +{ +} + +static inline void txx9dmac_chan_set_SMPCHN(struct txx9dmac_chan *dc) +{ + dc->ccr |= TXX9_DMA_CCR_SMPCHN; +} + +static inline void txx9dmac_desc_set_nosimple(struct txx9dmac_dev *ddev, + struct txx9dmac_desc *desc, + u32 sair, u32 dair, u32 ccr) +{ +} + +#else /* TXX9_DMA_USE_SIMPLE_CHAIN */ + +static inline bool txx9dmac_chan_INTENT(struct txx9dmac_chan *dc) +{ + return true; +} + +static void txx9dmac_chan_set_INTENT(struct txx9dmac_chan *dc) +{ +} + +static inline void txx9dmac_desc_set_INTENT(struct txx9dmac_dev *ddev, + struct txx9dmac_desc *desc) +{ + if (__is_dmac64(ddev)) + desc->hwdesc.CCR |= TXX9_DMA_CCR_INTENT; + else + desc->hwdesc32.CCR |= TXX9_DMA_CCR_INTENT; +} + +static inline void txx9dmac_chan_set_SMPCHN(struct txx9dmac_chan *dc) +{ +} + +static inline void txx9dmac_desc_set_nosimple(struct txx9dmac_dev *ddev, + struct txx9dmac_desc *desc, + u32 sai, u32 dai, u32 ccr) +{ + if (__is_dmac64(ddev)) { + desc->hwdesc.SAIR = sai; + desc->hwdesc.DAIR = dai; + desc->hwdesc.CCR = ccr; + } else { + desc->hwdesc32.SAIR = sai; + desc->hwdesc32.DAIR = dai; + desc->hwdesc32.CCR = ccr; + } +} + +#endif /* TXX9_DMA_USE_SIMPLE_CHAIN */ + +#endif /* TXX9DMAC_H */ |