diff options
Diffstat (limited to 'arch/arm/plat-stmp3xxx/include/mach/dma.h')
| -rw-r--r-- | arch/arm/plat-stmp3xxx/include/mach/dma.h | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/arch/arm/plat-stmp3xxx/include/mach/dma.h b/arch/arm/plat-stmp3xxx/include/mach/dma.h new file mode 100644 index 00000000000..7c58557c676 --- /dev/null +++ b/arch/arm/plat-stmp3xxx/include/mach/dma.h @@ -0,0 +1,153 @@ +/* + * Freescale STMP37XX/STMP378X DMA helper interface + * + * Embedded Alley Solutions, Inc <source@embeddedalley.com> + * + * Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved. + * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved. + */ + +/* + * The code contained herein is licensed under the GNU General Public + * License. You may obtain a copy of the GNU General Public License + * Version 2 or later at the following locations: + * + * http://www.opensource.org/licenses/gpl-license.html + * http://www.gnu.org/copyleft/gpl.html + */ +#ifndef __ASM_PLAT_STMP3XXX_DMA_H +#define __ASM_PLAT_STMP3XXX_DMA_H + +#include <linux/platform_device.h> +#include <linux/dmapool.h> + +#if !defined(MAX_PIO_WORDS) +#define MAX_PIO_WORDS (15) +#endif + +#define STMP3XXX_BUS_APBH 0 +#define STMP3XXX_BUS_APBX 1 +#define STMP3XXX_DMA_MAX_CHANNEL 16 +#define STMP3XXX_DMA_BUS(dma) ((dma) / 16) +#define STMP3XXX_DMA_CHANNEL(dma) ((dma) % 16) +#define STMP3XXX_DMA(channel, bus) ((bus) * 16 + (channel)) +#define MAX_DMA_ADDRESS 0xffffffff +#define MAX_DMA_CHANNELS 32 + +struct stmp3xxx_dma_command { + u32 next; + u32 cmd; + union { + u32 buf_ptr; + u32 alternate; + }; + u32 pio_words[MAX_PIO_WORDS]; +}; + +struct stmp3xxx_dma_descriptor { + struct stmp3xxx_dma_command *command; + dma_addr_t handle; + + /* The virtual address of the buffer pointer */ + void *virtual_buf_ptr; + /* The next descriptor in a the DMA chain (optional) */ + struct stmp3xxx_dma_descriptor *next_descr; +}; + +struct stmp37xx_circ_dma_chain { + unsigned total_count; + struct stmp3xxx_dma_descriptor *chain; + + unsigned free_index; + unsigned free_count; + unsigned active_index; + unsigned active_count; + unsigned cooked_index; + unsigned cooked_count; + + int bus; + unsigned channel; +}; + +static inline struct stmp3xxx_dma_descriptor + *stmp3xxx_dma_circ_get_free_head(struct stmp37xx_circ_dma_chain *chain) +{ + return &(chain->chain[chain->free_index]); +} + +static inline struct stmp3xxx_dma_descriptor + *stmp3xxx_dma_circ_get_cooked_head(struct stmp37xx_circ_dma_chain *chain) +{ + return &(chain->chain[chain->cooked_index]); +} + +int stmp3xxx_dma_request(int ch, struct device *dev, const char *name); +int stmp3xxx_dma_release(int ch); +int stmp3xxx_dma_allocate_command(int ch, + struct stmp3xxx_dma_descriptor *descriptor); +int stmp3xxx_dma_free_command(int ch, + struct stmp3xxx_dma_descriptor *descriptor); +void stmp3xxx_dma_continue(int channel, u32 semaphore); +void stmp3xxx_dma_go(int ch, struct stmp3xxx_dma_descriptor *head, + u32 semaphore); +int stmp3xxx_dma_running(int ch); +int stmp3xxx_dma_make_chain(int ch, struct stmp37xx_circ_dma_chain *chain, + struct stmp3xxx_dma_descriptor descriptors[], + unsigned items); +void stmp3xxx_dma_free_chain(struct stmp37xx_circ_dma_chain *chain); +void stmp37xx_circ_clear_chain(struct stmp37xx_circ_dma_chain *chain); +void stmp37xx_circ_advance_free(struct stmp37xx_circ_dma_chain *chain, + unsigned count); +void stmp37xx_circ_advance_active(struct stmp37xx_circ_dma_chain *chain, + unsigned count); +unsigned stmp37xx_circ_advance_cooked(struct stmp37xx_circ_dma_chain *chain); +int stmp3xxx_dma_read_semaphore(int ch); +void stmp3xxx_dma_init(void); +void stmp3xxx_dma_set_alt_target(int ch, int target); +void stmp3xxx_dma_suspend(void); +void stmp3xxx_dma_resume(void); + +/* + * STMP37xx and STMP378x have different DMA control + * registers layout + */ + +void stmp3xxx_arch_dma_freeze(int ch); +void stmp3xxx_arch_dma_unfreeze(int ch); +void stmp3xxx_arch_dma_reset_channel(int ch); +void stmp3xxx_arch_dma_enable_interrupt(int ch); +void stmp3xxx_arch_dma_clear_interrupt(int ch); +int stmp3xxx_arch_dma_is_interrupt(int ch); + +static inline void stmp3xxx_dma_reset_channel(int ch) +{ + stmp3xxx_arch_dma_reset_channel(ch); +} + + +static inline void stmp3xxx_dma_freeze(int ch) +{ + stmp3xxx_arch_dma_freeze(ch); +} + +static inline void stmp3xxx_dma_unfreeze(int ch) +{ + stmp3xxx_arch_dma_unfreeze(ch); +} + +static inline void stmp3xxx_dma_enable_interrupt(int ch) +{ + stmp3xxx_arch_dma_enable_interrupt(ch); +} + +static inline void stmp3xxx_dma_clear_interrupt(int ch) +{ + stmp3xxx_arch_dma_clear_interrupt(ch); +} + +static inline int stmp3xxx_dma_is_interrupt(int ch) +{ + return stmp3xxx_arch_dma_is_interrupt(ch); +} + +#endif /* __ASM_PLAT_STMP3XXX_DMA_H */ |