dmitry pervushin | e317872 | 2009-04-22 23:55:23 +0100 | [diff] [blame] | 1 | /* |
| 2 | * Freescale STMP37XX/STMP378X DMA helper interface |
| 3 | * |
| 4 | * Embedded Alley Solutions, Inc <source@embeddedalley.com> |
| 5 | * |
| 6 | * Copyright 2008 Freescale Semiconductor, Inc. All Rights Reserved. |
| 7 | * Copyright 2008 Embedded Alley Solutions, Inc All Rights Reserved. |
| 8 | */ |
| 9 | |
| 10 | /* |
| 11 | * The code contained herein is licensed under the GNU General Public |
| 12 | * License. You may obtain a copy of the GNU General Public License |
| 13 | * Version 2 or later at the following locations: |
| 14 | * |
| 15 | * http://www.opensource.org/licenses/gpl-license.html |
| 16 | * http://www.gnu.org/copyleft/gpl.html |
| 17 | */ |
| 18 | #ifndef __ASM_PLAT_STMP3XXX_DMA_H |
| 19 | #define __ASM_PLAT_STMP3XXX_DMA_H |
| 20 | |
| 21 | #include <linux/platform_device.h> |
| 22 | #include <linux/dmapool.h> |
| 23 | |
| 24 | #if !defined(MAX_PIO_WORDS) |
| 25 | #define MAX_PIO_WORDS (15) |
| 26 | #endif |
| 27 | |
dmitry pervushin | 98f420b | 2009-05-31 13:32:11 +0100 | [diff] [blame] | 28 | #define STMP3XXX_BUS_APBH 0 |
| 29 | #define STMP3XXX_BUS_APBX 1 |
dmitry pervushin | e317872 | 2009-04-22 23:55:23 +0100 | [diff] [blame] | 30 | #define STMP3XXX_DMA_MAX_CHANNEL 16 |
dmitry pervushin | 98f420b | 2009-05-31 13:32:11 +0100 | [diff] [blame] | 31 | #define STMP3XXX_DMA_BUS(dma) ((dma) / 16) |
| 32 | #define STMP3XXX_DMA_CHANNEL(dma) ((dma) % 16) |
| 33 | #define STMP3XXX_DMA(channel, bus) ((bus) * 16 + (channel)) |
| 34 | #define MAX_DMA_ADDRESS 0xffffffff |
| 35 | #define MAX_DMA_CHANNELS 32 |
dmitry pervushin | e317872 | 2009-04-22 23:55:23 +0100 | [diff] [blame] | 36 | |
| 37 | struct stmp3xxx_dma_command { |
| 38 | u32 next; |
| 39 | u32 cmd; |
| 40 | union { |
| 41 | u32 buf_ptr; |
| 42 | u32 alternate; |
| 43 | }; |
| 44 | u32 pio_words[MAX_PIO_WORDS]; |
| 45 | }; |
| 46 | |
| 47 | struct stmp3xxx_dma_descriptor { |
| 48 | struct stmp3xxx_dma_command *command; |
| 49 | dma_addr_t handle; |
| 50 | |
| 51 | /* The virtual address of the buffer pointer */ |
| 52 | void *virtual_buf_ptr; |
| 53 | /* The next descriptor in a the DMA chain (optional) */ |
| 54 | struct stmp3xxx_dma_descriptor *next_descr; |
| 55 | }; |
| 56 | |
| 57 | struct stmp37xx_circ_dma_chain { |
| 58 | unsigned total_count; |
| 59 | struct stmp3xxx_dma_descriptor *chain; |
| 60 | |
| 61 | unsigned free_index; |
| 62 | unsigned free_count; |
| 63 | unsigned active_index; |
| 64 | unsigned active_count; |
| 65 | unsigned cooked_index; |
| 66 | unsigned cooked_count; |
| 67 | |
| 68 | int bus; |
| 69 | unsigned channel; |
| 70 | }; |
| 71 | |
| 72 | static inline struct stmp3xxx_dma_descriptor |
| 73 | *stmp3xxx_dma_circ_get_free_head(struct stmp37xx_circ_dma_chain *chain) |
| 74 | { |
| 75 | return &(chain->chain[chain->free_index]); |
| 76 | } |
| 77 | |
| 78 | static inline struct stmp3xxx_dma_descriptor |
| 79 | *stmp3xxx_dma_circ_get_cooked_head(struct stmp37xx_circ_dma_chain *chain) |
| 80 | { |
| 81 | return &(chain->chain[chain->cooked_index]); |
| 82 | } |
| 83 | |
| 84 | int stmp3xxx_dma_request(int ch, struct device *dev, const char *name); |
| 85 | int stmp3xxx_dma_release(int ch); |
| 86 | int stmp3xxx_dma_allocate_command(int ch, |
| 87 | struct stmp3xxx_dma_descriptor *descriptor); |
| 88 | int stmp3xxx_dma_free_command(int ch, |
| 89 | struct stmp3xxx_dma_descriptor *descriptor); |
| 90 | void stmp3xxx_dma_continue(int channel, u32 semaphore); |
| 91 | void stmp3xxx_dma_go(int ch, struct stmp3xxx_dma_descriptor *head, |
| 92 | u32 semaphore); |
| 93 | int stmp3xxx_dma_running(int ch); |
| 94 | int stmp3xxx_dma_make_chain(int ch, struct stmp37xx_circ_dma_chain *chain, |
| 95 | struct stmp3xxx_dma_descriptor descriptors[], |
| 96 | unsigned items); |
| 97 | void stmp3xxx_dma_free_chain(struct stmp37xx_circ_dma_chain *chain); |
| 98 | void stmp37xx_circ_clear_chain(struct stmp37xx_circ_dma_chain *chain); |
| 99 | void stmp37xx_circ_advance_free(struct stmp37xx_circ_dma_chain *chain, |
| 100 | unsigned count); |
| 101 | void stmp37xx_circ_advance_active(struct stmp37xx_circ_dma_chain *chain, |
| 102 | unsigned count); |
| 103 | unsigned stmp37xx_circ_advance_cooked(struct stmp37xx_circ_dma_chain *chain); |
| 104 | int stmp3xxx_dma_read_semaphore(int ch); |
| 105 | void stmp3xxx_dma_init(void); |
| 106 | void stmp3xxx_dma_set_alt_target(int ch, int target); |
| 107 | void stmp3xxx_dma_suspend(void); |
| 108 | void stmp3xxx_dma_resume(void); |
| 109 | |
| 110 | /* |
| 111 | * STMP37xx and STMP378x have different DMA control |
| 112 | * registers layout |
| 113 | */ |
| 114 | |
| 115 | void stmp3xxx_arch_dma_freeze(int ch); |
| 116 | void stmp3xxx_arch_dma_unfreeze(int ch); |
| 117 | void stmp3xxx_arch_dma_reset_channel(int ch); |
| 118 | void stmp3xxx_arch_dma_enable_interrupt(int ch); |
| 119 | void stmp3xxx_arch_dma_clear_interrupt(int ch); |
| 120 | int stmp3xxx_arch_dma_is_interrupt(int ch); |
| 121 | |
| 122 | static inline void stmp3xxx_dma_reset_channel(int ch) |
| 123 | { |
| 124 | stmp3xxx_arch_dma_reset_channel(ch); |
| 125 | } |
| 126 | |
| 127 | |
| 128 | static inline void stmp3xxx_dma_freeze(int ch) |
| 129 | { |
| 130 | stmp3xxx_arch_dma_freeze(ch); |
| 131 | } |
| 132 | |
| 133 | static inline void stmp3xxx_dma_unfreeze(int ch) |
| 134 | { |
| 135 | stmp3xxx_arch_dma_unfreeze(ch); |
| 136 | } |
| 137 | |
| 138 | static inline void stmp3xxx_dma_enable_interrupt(int ch) |
| 139 | { |
| 140 | stmp3xxx_arch_dma_enable_interrupt(ch); |
| 141 | } |
| 142 | |
| 143 | static inline void stmp3xxx_dma_clear_interrupt(int ch) |
| 144 | { |
| 145 | stmp3xxx_arch_dma_clear_interrupt(ch); |
| 146 | } |
| 147 | |
| 148 | static inline int stmp3xxx_dma_is_interrupt(int ch) |
| 149 | { |
| 150 | return stmp3xxx_arch_dma_is_interrupt(ch); |
| 151 | } |
| 152 | |
| 153 | #endif /* __ASM_PLAT_STMP3XXX_DMA_H */ |