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author | Khoronzhuk, Ivan <ivan.khoronzhuk@ti.com> | 2014-10-22 14:47:56 (GMT) |
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committer | Tom Rini <trini@ti.com> | 2014-10-23 15:27:29 (GMT) |
commit | e165b1d34cd91cb42b0614792aa88e0677944ee7 (patch) | |
tree | da7da2e4c75c78788e2fc485e22807f19169953b /arch/arm/include/asm/ti-common | |
parent | 00b821f16e65d1242b026dcc9834ddeab2fffcab (diff) | |
download | u-boot-e165b1d34cd91cb42b0614792aa88e0677944ee7.tar.xz |
dma: ti-edma3: introduce edma3 driver
The EDMA3 controller’s primary purpose is to service data transfers
that you program between two memory-mapped slave endpoints on the device.
Typical usage includes, but is not limited to the following:
- Servicing software-driven paging transfers (e.g., transfers from external
memory, such as SDRAM to internal device memory, such as DSP L2 SRAM)
- Servicing event-driven peripherals, such as a serial port
- Performing sorting or sub-frame extraction of various data structures
- Offloading data transfers from the main device DSP(s)
- See the device-specific data manual for specific peripherals that are
accessible via the EDMA3 controller
Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@ti.com>
Diffstat (limited to 'arch/arm/include/asm/ti-common')
-rw-r--r-- | arch/arm/include/asm/ti-common/ti-edma3.h | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/arch/arm/include/asm/ti-common/ti-edma3.h b/arch/arm/include/asm/ti-common/ti-edma3.h new file mode 100644 index 0000000..5adc1da --- /dev/null +++ b/arch/arm/include/asm/ti-common/ti-edma3.h @@ -0,0 +1,121 @@ +/* + * Enhanced Direct Memory Access (EDMA3) Controller + * + * (C) Copyright 2014 + * Texas Instruments Incorporated, <www.ti.com> + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#ifndef _EDMA3_H_ +#define _EDMA3_H_ + +#include <linux/stddef.h> + +#define EDMA3_PARSET_NULL_LINK 0xffff + +/* + * All parameter RAM set options + * opt field in edma3_param_set_config structure + */ +#define EDMA3_SLOPT_PRIV_LEVEL BIT(31) +#define EDMA3_SLOPT_PRIV_ID(id) ((0xf & (id)) << 24) +#define EDMA3_SLOPT_INTERM_COMP_CHAIN_ENB BIT(23) +#define EDMA3_SLOPT_TRANS_COMP_CHAIN_ENB BIT(22) +#define EDMA3_SLOPT_INTERM_COMP_INT_ENB BIT(21) +#define EDMA3_SLOPT_TRANS_COMP_INT_ENB BIT(20) +#define EDMA3_SLOPT_COMP_CODE(code) ((0x3f & (code)) << 12) +#define EDMA3_SLOPT_FIFO_WIDTH_8 0 +#define EDMA3_SLOPT_FIFO_WIDTH_16 (1 << 8) +#define EDMA3_SLOPT_FIFO_WIDTH_32 (2 << 8) +#define EDMA3_SLOPT_FIFO_WIDTH_64 (3 << 8) +#define EDMA3_SLOPT_FIFO_WIDTH_128 (4 << 8) +#define EDMA3_SLOPT_FIFO_WIDTH_256 (5 << 8) +#define EDMA3_SLOPT_FIFO_WIDTH_SET(w) ((w & 0x7) << 8) +#define EDMA3_SLOPT_STATIC BIT(3) +#define EDMA3_SLOPT_AB_SYNC BIT(2) +#define EDMA3_SLOPT_DST_ADDR_CONST_MODE BIT(1) +#define EDMA3_SLOPT_SRC_ADDR_CONST_MODE BIT(0) + +enum edma3_address_mode { + INCR = 0, + FIFO = 1 +}; + +enum edma3_fifo_width { + W8BIT = 0, + W16BIT = 1, + W32BIT = 2, + W64BIT = 3, + W128BIT = 4, + W256BIT = 5 +}; + +enum edma3_sync_dimension { + ASYNC = 0, + ABSYNC = 1 +}; + +/* PaRAM slots are laid out like this */ +struct edma3_slot_layout { + u32 opt; + u32 src; + u32 a_b_cnt; + u32 dst; + u32 src_dst_bidx; + u32 link_bcntrld; + u32 src_dst_cidx; + u32 ccnt; +} __packed; + +/* + * Use this to assign trigger word number of edma3_slot_layout struct. + * trigger_word_name - is the exact name from edma3_slot_layout. + */ +#define EDMA3_TWORD(trigger_word_name)\ + (offsetof(struct edma3_slot_layout, trigger_word_name) / 4) + +struct edma3_slot_config { + u32 opt; + u32 src; + u32 dst; + int bcnt; + int acnt; + int ccnt; + int src_bidx; + int dst_bidx; + int src_cidx; + int dst_cidx; + int bcntrld; + int link; +}; + +struct edma3_channel_config { + int slot; + int chnum; + int complete_code; /* indicate pending complete interrupt */ + int trigger_slot_word; /* only used for qedma */ +}; + +void qedma3_start(u32 base, struct edma3_channel_config *cfg); +void qedma3_stop(u32 base, struct edma3_channel_config *cfg); +void edma3_slot_configure(u32 base, int slot, struct edma3_slot_config *cfg); +int edma3_check_for_transfer(u32 base, struct edma3_channel_config *cfg); +void edma3_write_slot(u32 base, int slot, struct edma3_slot_layout *param); +void edma3_read_slot(u32 base, int slot, struct edma3_slot_layout *param); + +void edma3_set_dest(u32 base, int slot, u32 dst, enum edma3_address_mode mode, + enum edma3_fifo_width width); +void edma3_set_dest_index(u32 base, unsigned slot, int bidx, int cidx); +void edma3_set_dest_addr(u32 base, int slot, u32 dst); + +void edma3_set_src(u32 base, int slot, u32 src, enum edma3_address_mode mode, + enum edma3_fifo_width width); +void edma3_set_src_index(u32 base, unsigned slot, int bidx, int cidx); +void edma3_set_src_addr(u32 base, int slot, u32 src); + +void edma3_set_transfer_params(u32 base, int slot, int acnt, + int bcnt, int ccnt, u16 bcnt_rld, + enum edma3_sync_dimension sync_mode); + +#endif |