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/*
* 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_64BIT_PHYS_ADDR)
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 */
dma_cookie_t completed;
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_64BIT_PHYS_ADDR)
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 */