308 lines
7.7 KiB
C
Executable File
308 lines
7.7 KiB
C
Executable File
/*
|
|
* 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 */
|
|
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 */
|