diff options
Diffstat (limited to 'arch/blackfin/include/asm/dma.h')
| -rw-r--r-- | arch/blackfin/include/asm/dma.h | 384 |
1 files changed, 264 insertions, 120 deletions
diff --git a/arch/blackfin/include/asm/dma.h b/arch/blackfin/include/asm/dma.h index 6509733bb0f..40e9c2bbc6e 100644 --- a/arch/blackfin/include/asm/dma.h +++ b/arch/blackfin/include/asm/dma.h @@ -1,97 +1,125 @@ /* - * File: include/asm-blackfin/simple_bf533_dma.h - * Based on: none - original work - * Author: LG Soft India - * Copyright (C) 2004-2005 Analog Devices Inc. - * Created: Tue Sep 21 2004 - * Description: This file contains the major Data structures and constants - * used for DMA Implementation in BF533 - * Modified: + * dma.h - Blackfin DMA defines/structures/etc... * - * Bugs: Enter bugs at http://blackfin.uclinux.org/ - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2, or (at your option) - * any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; see the file COPYING. - * If not, write to the Free Software Foundation, - * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * Copyright 2004-2008 Analog Devices Inc. + * Licensed under the GPL-2 or later. */ #ifndef _BLACKFIN_DMA_H_ #define _BLACKFIN_DMA_H_ -#include <asm/io.h> -#include <linux/slab.h> -#include <asm/irq.h> -#include <asm/signal.h> - -#include <linux/kernel.h> -#include <mach/dma.h> -#include <linux/mm.h> #include <linux/interrupt.h> +#include <mach/dma.h> +#include <linux/atomic.h> #include <asm/blackfin.h> - -#define MAX_DMA_ADDRESS PAGE_OFFSET - -/***************************************************************************** -* Generic DMA Declarations -* -****************************************************************************/ -enum dma_chan_status { - DMA_CHANNEL_FREE, - DMA_CHANNEL_REQUESTED, - DMA_CHANNEL_ENABLED, -}; +#include <asm/page.h> +#include <asm-generic/dma.h> +#include <asm/bfin_dma.h> /*------------------------- * config reg bits value *-------------------------*/ -#define DATA_SIZE_8 0 -#define DATA_SIZE_16 1 -#define DATA_SIZE_32 2 +#define DATA_SIZE_8 0 +#define DATA_SIZE_16 1 +#define DATA_SIZE_32 2 +#ifdef CONFIG_BF60x +#define DATA_SIZE_64 3 +#endif -#define DMA_FLOW_STOP 0 -#define DMA_FLOW_AUTO 1 -#define DMA_FLOW_ARRAY 4 -#define DMA_FLOW_SMALL 6 -#define DMA_FLOW_LARGE 7 +#define DMA_FLOW_STOP 0 +#define DMA_FLOW_AUTO 1 +#ifdef CONFIG_BF60x +#define DMA_FLOW_LIST 4 +#define DMA_FLOW_ARRAY 5 +#define DMA_FLOW_LIST_DEMAND 6 +#define DMA_FLOW_ARRAY_DEMAND 7 +#else +#define DMA_FLOW_ARRAY 4 +#define DMA_FLOW_SMALL 6 +#define DMA_FLOW_LARGE 7 +#endif -#define DIMENSION_LINEAR 0 -#define DIMENSION_2D 1 +#define DIMENSION_LINEAR 0 +#define DIMENSION_2D 1 -#define DIR_READ 0 -#define DIR_WRITE 1 +#define DIR_READ 0 +#define DIR_WRITE 1 -#define INTR_DISABLE 0 -#define INTR_ON_BUF 2 -#define INTR_ON_ROW 3 +#define INTR_DISABLE 0 +#ifdef CONFIG_BF60x +#define INTR_ON_PERI 1 +#endif +#define INTR_ON_BUF 2 +#define INTR_ON_ROW 3 #define DMA_NOSYNC_KEEP_DMA_BUF 0 -#define DMA_SYNC_RESTART 1 +#define DMA_SYNC_RESTART 1 + +#ifdef DMA_MMR_SIZE_32 +#define DMA_MMR_SIZE_TYPE long +#define DMA_MMR_READ bfin_read32 +#define DMA_MMR_WRITE bfin_write32 +#else +#define DMA_MMR_SIZE_TYPE short +#define DMA_MMR_READ bfin_read16 +#define DMA_MMR_WRITE bfin_write16 +#endif + +struct dma_desc_array { + unsigned long start_addr; + unsigned DMA_MMR_SIZE_TYPE cfg; + unsigned DMA_MMR_SIZE_TYPE x_count; + DMA_MMR_SIZE_TYPE x_modify; +} __attribute__((packed)); struct dmasg { - unsigned long next_desc_addr; + void *next_desc_addr; unsigned long start_addr; - unsigned short cfg; - unsigned short x_count; - short x_modify; - unsigned short y_count; - short y_modify; + unsigned DMA_MMR_SIZE_TYPE cfg; + unsigned DMA_MMR_SIZE_TYPE x_count; + DMA_MMR_SIZE_TYPE x_modify; + unsigned DMA_MMR_SIZE_TYPE y_count; + DMA_MMR_SIZE_TYPE y_modify; } __attribute__((packed)); struct dma_register { - unsigned long next_desc_ptr; /* DMA Next Descriptor Pointer register */ + void *next_desc_ptr; /* DMA Next Descriptor Pointer register */ unsigned long start_addr; /* DMA Start address register */ +#ifdef CONFIG_BF60x + unsigned long cfg; /* DMA Configuration register */ + + unsigned long x_count; /* DMA x_count register */ + + long x_modify; /* DMA x_modify register */ + + unsigned long y_count; /* DMA y_count register */ + + long y_modify; /* DMA y_modify register */ + + unsigned long reserved; + unsigned long reserved2; + + void *curr_desc_ptr; /* DMA Current Descriptor Pointer + register */ + void *prev_desc_ptr; /* DMA previous initial Descriptor Pointer + register */ + unsigned long curr_addr_ptr; /* DMA Current Address Pointer + register */ + unsigned long irq_status; /* DMA irq status register */ + + unsigned long curr_x_count; /* DMA Current x-count register */ + + unsigned long curr_y_count; /* DMA Current y-count register */ + + unsigned long reserved3; + unsigned long bw_limit_count; /* DMA band width limit count register */ + unsigned long curr_bw_limit_count; /* DMA Current band width limit + count register */ + unsigned long bw_monitor_count; /* DMA band width limit count register */ + unsigned long curr_bw_monitor_count; /* DMA Current band width limit + count register */ +#else unsigned short cfg; /* DMA Configuration register */ unsigned short dummy1; /* DMA Configuration register */ @@ -109,7 +137,7 @@ struct dma_register { short y_modify; /* DMA y_modify register */ unsigned short dummy5; - unsigned long curr_desc_ptr; /* DMA Current Descriptor Pointer + void *curr_desc_ptr; /* DMA Current Descriptor Pointer register */ unsigned long curr_addr_ptr; /* DMA Current Address Pointer register */ @@ -128,22 +156,17 @@ struct dma_register { unsigned short dummy9; unsigned long reserved3; +#endif }; -typedef irqreturn_t(*dma_interrupt_t) (int irq, void *dev_id); - struct dma_channel { - struct mutex dmalock; - char *device_id; - enum dma_chan_status chan_status; - struct dma_register *regs; + const char *device_id; + atomic_t chan_status; + volatile struct dma_register *regs; struct dmasg *sg; /* large mode descriptor */ - unsigned int ctrl_num; /* controller number */ - dma_interrupt_t irq_callback; + unsigned int irq; void *data; - unsigned int dma_enable_flag; - unsigned int loopback_flag; #ifdef CONFIG_PM unsigned short saved_peripheral_map; #endif @@ -157,49 +180,170 @@ void blackfin_dma_resume(void); /******************************************************************************* * DMA API's *******************************************************************************/ -/* functions to set register mode */ -void set_dma_start_addr(unsigned int channel, unsigned long addr); -void set_dma_next_desc_addr(unsigned int channel, unsigned long addr); -void set_dma_curr_desc_addr(unsigned int channel, unsigned long addr); -void set_dma_x_count(unsigned int channel, unsigned short x_count); -void set_dma_x_modify(unsigned int channel, short x_modify); -void set_dma_y_count(unsigned int channel, unsigned short y_count); -void set_dma_y_modify(unsigned int channel, short y_modify); -void set_dma_config(unsigned int channel, unsigned short config); -unsigned short set_bfin_dma_config(char direction, char flow_mode, - char intr_mode, char dma_mode, char width, - char syncmode); -void set_dma_curr_addr(unsigned int channel, unsigned long addr); - -/* get curr status for polling */ -unsigned short get_dma_curr_irqstat(unsigned int channel); -unsigned short get_dma_curr_xcount(unsigned int channel); -unsigned short get_dma_curr_ycount(unsigned int channel); -unsigned long get_dma_next_desc_ptr(unsigned int channel); -unsigned long get_dma_curr_desc_ptr(unsigned int channel); -unsigned long get_dma_curr_addr(unsigned int channel); - -/* set large DMA mode descriptor */ -void set_dma_sg(unsigned int channel, struct dmasg *sg, int nr_sg); - -/* check if current channel is in use */ -int dma_channel_active(unsigned int channel); - -/* common functions must be called in any mode */ -void free_dma(unsigned int channel); -int dma_channel_active(unsigned int channel); /* check if a channel is in use */ -void disable_dma(unsigned int channel); -void enable_dma(unsigned int channel); -int request_dma(unsigned int channel, char *device_id); -int set_dma_callback(unsigned int channel, dma_interrupt_t callback, - void *data); -void dma_disable_irq(unsigned int channel); -void dma_enable_irq(unsigned int channel); -void clear_dma_irqstat(unsigned int channel); +extern struct dma_channel dma_ch[MAX_DMA_CHANNELS]; +extern struct dma_register * const dma_io_base_addr[MAX_DMA_CHANNELS]; +extern int channel2irq(unsigned int channel); + +static inline void set_dma_start_addr(unsigned int channel, unsigned long addr) +{ + dma_ch[channel].regs->start_addr = addr; +} +static inline void set_dma_next_desc_addr(unsigned int channel, void *addr) +{ + dma_ch[channel].regs->next_desc_ptr = addr; +} +static inline void set_dma_curr_desc_addr(unsigned int channel, void *addr) +{ + dma_ch[channel].regs->curr_desc_ptr = addr; +} +static inline void set_dma_x_count(unsigned int channel, unsigned DMA_MMR_SIZE_TYPE x_count) +{ + dma_ch[channel].regs->x_count = x_count; +} +static inline void set_dma_y_count(unsigned int channel, unsigned DMA_MMR_SIZE_TYPE y_count) +{ + dma_ch[channel].regs->y_count = y_count; +} +static inline void set_dma_x_modify(unsigned int channel, DMA_MMR_SIZE_TYPE x_modify) +{ + dma_ch[channel].regs->x_modify = x_modify; +} +static inline void set_dma_y_modify(unsigned int channel, DMA_MMR_SIZE_TYPE y_modify) +{ + dma_ch[channel].regs->y_modify = y_modify; +} +static inline void set_dma_config(unsigned int channel, unsigned DMA_MMR_SIZE_TYPE config) +{ + dma_ch[channel].regs->cfg = config; +} +static inline void set_dma_curr_addr(unsigned int channel, unsigned long addr) +{ + dma_ch[channel].regs->curr_addr_ptr = addr; +} + +#ifdef CONFIG_BF60x +static inline unsigned long +set_bfin_dma_config2(char direction, char flow_mode, char intr_mode, + char dma_mode, char mem_width, char syncmode, char peri_width) +{ + unsigned long config = 0; + + switch (intr_mode) { + case INTR_ON_BUF: + if (dma_mode == DIMENSION_2D) + config = DI_EN_Y; + else + config = DI_EN_X; + break; + case INTR_ON_ROW: + config = DI_EN_X; + break; + case INTR_ON_PERI: + config = DI_EN_P; + break; + }; + + return config | (direction << 1) | (mem_width << 8) | (dma_mode << 26) | + (flow_mode << 12) | (syncmode << 2) | (peri_width << 4); +} +#endif + +static inline unsigned DMA_MMR_SIZE_TYPE +set_bfin_dma_config(char direction, char flow_mode, + char intr_mode, char dma_mode, char mem_width, char syncmode) +{ +#ifdef CONFIG_BF60x + return set_bfin_dma_config2(direction, flow_mode, intr_mode, dma_mode, + mem_width, syncmode, mem_width); +#else + return (direction << 1) | (mem_width << 2) | (dma_mode << 4) | + (intr_mode << 6) | (flow_mode << 12) | (syncmode << 5); +#endif +} + +static inline unsigned DMA_MMR_SIZE_TYPE get_dma_curr_irqstat(unsigned int channel) +{ + return dma_ch[channel].regs->irq_status; +} +static inline unsigned DMA_MMR_SIZE_TYPE get_dma_curr_xcount(unsigned int channel) +{ + return dma_ch[channel].regs->curr_x_count; +} +static inline unsigned DMA_MMR_SIZE_TYPE get_dma_curr_ycount(unsigned int channel) +{ + return dma_ch[channel].regs->curr_y_count; +} +static inline void *get_dma_next_desc_ptr(unsigned int channel) +{ + return dma_ch[channel].regs->next_desc_ptr; +} +static inline void *get_dma_curr_desc_ptr(unsigned int channel) +{ + return dma_ch[channel].regs->curr_desc_ptr; +} +static inline unsigned DMA_MMR_SIZE_TYPE get_dma_config(unsigned int channel) +{ + return dma_ch[channel].regs->cfg; +} +static inline unsigned long get_dma_curr_addr(unsigned int channel) +{ + return dma_ch[channel].regs->curr_addr_ptr; +} + +static inline void set_dma_sg(unsigned int channel, struct dmasg *sg, int ndsize) +{ + /* Make sure the internal data buffers in the core are drained + * so that the DMA descriptors are completely written when the + * DMA engine goes to fetch them below. + */ + SSYNC(); + + dma_ch[channel].regs->next_desc_ptr = sg; + dma_ch[channel].regs->cfg = + (dma_ch[channel].regs->cfg & ~NDSIZE) | + ((ndsize << NDSIZE_OFFSET) & NDSIZE); +} + +static inline int dma_channel_active(unsigned int channel) +{ + return atomic_read(&dma_ch[channel].chan_status); +} + +static inline void disable_dma(unsigned int channel) +{ + dma_ch[channel].regs->cfg &= ~DMAEN; + SSYNC(); +} +static inline void enable_dma(unsigned int channel) +{ + dma_ch[channel].regs->curr_x_count = 0; + dma_ch[channel].regs->curr_y_count = 0; + dma_ch[channel].regs->cfg |= DMAEN; +} +int set_dma_callback(unsigned int channel, irq_handler_t callback, void *data); + +static inline void dma_disable_irq(unsigned int channel) +{ + disable_irq(dma_ch[channel].irq); +} +static inline void dma_disable_irq_nosync(unsigned int channel) +{ + disable_irq_nosync(dma_ch[channel].irq); +} +static inline void dma_enable_irq(unsigned int channel) +{ + enable_irq(dma_ch[channel].irq); +} +static inline void clear_dma_irqstat(unsigned int channel) +{ + dma_ch[channel].regs->irq_status = DMA_DONE | DMA_ERR | DMA_PIRQ; +} + void *dma_memcpy(void *dest, const void *src, size_t count); +void *dma_memcpy_nocache(void *dest, const void *src, size_t count); void *safe_dma_memcpy(void *dest, const void *src, size_t count); - -extern int channel2irq(unsigned int channel); -extern struct dma_register *dma_io_base_addr[MAX_BLACKFIN_DMA_CHANNEL]; +void blackfin_dma_early_init(void); +void early_dma_memcpy(void *dest, const void *src, size_t count); +void early_dma_memcpy_done(void); #endif |