98f420b23a
Replace HW_zzz register access macros by regular __raw_readl/__raw_writel calls Signed-off-by: dmitry pervushin <dpervushin@embeddedalley.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
153 lines
4.2 KiB
C
153 lines
4.2 KiB
C
/*
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* Freescale STMP37XX/STMP378X DMA helper interface
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*
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* Embedded Alley Solutions, Inc <source@embeddedalley.com>
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*
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* Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved.
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* Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved.
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*/
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/*
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* The code contained herein is licensed under the GNU General Public
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* License. You may obtain a copy of the GNU General Public License
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* Version 2 or later at the following locations:
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*
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* http://www.opensource.org/licenses/gpl-license.html
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* http://www.gnu.org/copyleft/gpl.html
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*/
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#ifndef __ASM_PLAT_STMP3XXX_DMA_H
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#define __ASM_PLAT_STMP3XXX_DMA_H
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#include <linux/platform_device.h>
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#include <linux/dmapool.h>
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#if !defined(MAX_PIO_WORDS)
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#define MAX_PIO_WORDS (15)
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#endif
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#define STMP3XXX_BUS_APBH 0
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#define STMP3XXX_BUS_APBX 1
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#define STMP3XXX_DMA_MAX_CHANNEL 16
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#define STMP3XXX_DMA_BUS(dma) ((dma) / 16)
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#define STMP3XXX_DMA_CHANNEL(dma) ((dma) % 16)
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#define STMP3XXX_DMA(channel, bus) ((bus) * 16 + (channel))
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#define MAX_DMA_ADDRESS 0xffffffff
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#define MAX_DMA_CHANNELS 32
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struct stmp3xxx_dma_command {
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u32 next;
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u32 cmd;
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union {
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u32 buf_ptr;
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u32 alternate;
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};
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u32 pio_words[MAX_PIO_WORDS];
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};
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struct stmp3xxx_dma_descriptor {
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struct stmp3xxx_dma_command *command;
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dma_addr_t handle;
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/* The virtual address of the buffer pointer */
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void *virtual_buf_ptr;
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/* The next descriptor in a the DMA chain (optional) */
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struct stmp3xxx_dma_descriptor *next_descr;
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};
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struct stmp37xx_circ_dma_chain {
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unsigned total_count;
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struct stmp3xxx_dma_descriptor *chain;
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unsigned free_index;
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unsigned free_count;
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unsigned active_index;
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unsigned active_count;
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unsigned cooked_index;
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unsigned cooked_count;
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int bus;
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unsigned channel;
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};
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static inline struct stmp3xxx_dma_descriptor
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*stmp3xxx_dma_circ_get_free_head(struct stmp37xx_circ_dma_chain *chain)
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{
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return &(chain->chain[chain->free_index]);
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}
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static inline struct stmp3xxx_dma_descriptor
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*stmp3xxx_dma_circ_get_cooked_head(struct stmp37xx_circ_dma_chain *chain)
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{
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return &(chain->chain[chain->cooked_index]);
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}
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int stmp3xxx_dma_request(int ch, struct device *dev, const char *name);
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int stmp3xxx_dma_release(int ch);
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int stmp3xxx_dma_allocate_command(int ch,
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struct stmp3xxx_dma_descriptor *descriptor);
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int stmp3xxx_dma_free_command(int ch,
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struct stmp3xxx_dma_descriptor *descriptor);
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void stmp3xxx_dma_continue(int channel, u32 semaphore);
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void stmp3xxx_dma_go(int ch, struct stmp3xxx_dma_descriptor *head,
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u32 semaphore);
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int stmp3xxx_dma_running(int ch);
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int stmp3xxx_dma_make_chain(int ch, struct stmp37xx_circ_dma_chain *chain,
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struct stmp3xxx_dma_descriptor descriptors[],
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unsigned items);
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void stmp3xxx_dma_free_chain(struct stmp37xx_circ_dma_chain *chain);
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void stmp37xx_circ_clear_chain(struct stmp37xx_circ_dma_chain *chain);
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void stmp37xx_circ_advance_free(struct stmp37xx_circ_dma_chain *chain,
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unsigned count);
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void stmp37xx_circ_advance_active(struct stmp37xx_circ_dma_chain *chain,
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unsigned count);
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unsigned stmp37xx_circ_advance_cooked(struct stmp37xx_circ_dma_chain *chain);
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int stmp3xxx_dma_read_semaphore(int ch);
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void stmp3xxx_dma_init(void);
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void stmp3xxx_dma_set_alt_target(int ch, int target);
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void stmp3xxx_dma_suspend(void);
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void stmp3xxx_dma_resume(void);
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/*
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* STMP37xx and STMP378x have different DMA control
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* registers layout
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*/
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void stmp3xxx_arch_dma_freeze(int ch);
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void stmp3xxx_arch_dma_unfreeze(int ch);
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void stmp3xxx_arch_dma_reset_channel(int ch);
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void stmp3xxx_arch_dma_enable_interrupt(int ch);
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void stmp3xxx_arch_dma_clear_interrupt(int ch);
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int stmp3xxx_arch_dma_is_interrupt(int ch);
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static inline void stmp3xxx_dma_reset_channel(int ch)
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{
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stmp3xxx_arch_dma_reset_channel(ch);
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}
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static inline void stmp3xxx_dma_freeze(int ch)
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{
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stmp3xxx_arch_dma_freeze(ch);
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}
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static inline void stmp3xxx_dma_unfreeze(int ch)
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{
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stmp3xxx_arch_dma_unfreeze(ch);
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}
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static inline void stmp3xxx_dma_enable_interrupt(int ch)
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{
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stmp3xxx_arch_dma_enable_interrupt(ch);
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}
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static inline void stmp3xxx_dma_clear_interrupt(int ch)
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{
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stmp3xxx_arch_dma_clear_interrupt(ch);
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}
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static inline int stmp3xxx_dma_is_interrupt(int ch)
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{
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return stmp3xxx_arch_dma_is_interrupt(ch);
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}
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#endif /* __ASM_PLAT_STMP3XXX_DMA_H */
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