diff options
Diffstat (limited to 'src/soc/nvidia/tegra132/dma.h')
| -rw-r--r-- | src/soc/nvidia/tegra132/dma.h | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/src/soc/nvidia/tegra132/dma.h b/src/soc/nvidia/tegra132/dma.h new file mode 100644 index 0000000000..7b07cbc89b --- /dev/null +++ b/src/soc/nvidia/tegra132/dma.h @@ -0,0 +1,190 @@ +/* + * (C) Copyright 2010,2011 + * NVIDIA Corporation <www.nvidia.com> + * Copyright (C) 2014 Google Inc. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope 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. If not, see <http://www.gnu.org/licenses/>. + */ + +#ifndef __NVIDIA_TEGRA132_DMA_H__ +#define __NVIDIA_TEGRA132_DMA_H__ + +#include <inttypes.h> +#include <soc/addressmap.h> + +/* + * The DMA engine operates on 4 bytes at a time, so make sure any data + * passed via DMA is aligned to avoid underrun/overrun. + */ +#define TEGRA_DMA_ALIGN_BYTES 4 + +/* + * Note: Many APB DMA controller registers are laid out such that each + * bit controls or represents the status for the corresponding channel. + * So we will not bother to list each individual bit in this case. + */ +#define APB_COMMAND_GEN (1 << 31) + +#define APB_CNTRL_REG_COUNT_VALUE_MASK 0xffff +#define APB_CNTRL_REG_COUNT_VALUE_SHIFT 0 + +/* + * Note: Many APB DMA controller registers are laid out such that each + * bit controls or represents the status for the corresponding channel. + * So we will not bother to list each individual bit in this case. + */ +#define APB_COMMAND_GEN (1 << 31) + +#define APB_CNTRL_REG_COUNT_VALUE_MASK 0xffff +#define APB_CNTRL_REG_COUNT_VALUE_SHIFT 0 +struct apb_dma { + u32 command; /* 0x00 */ + u32 status; /* 0x04 */ + u32 rsvd1[2]; + u32 cntrl_reg; /* 0x10 */ + u32 irq_sta_cpu; /* 0x14 */ + u32 irq_sta_cop; /* 0x18 */ + u32 irq_mask; /* 0x1c */ + u32 irq_mask_set; /* 0x20 */ + u32 irq_mask_clr; /* 0x24 */ + u32 trig_reg; /* 0x28 */ + u32 channel_trig_reg; /* 0x2c */ + u32 dma_status; /* 0x30 */ + u32 channel_en_reg; /* 0x34 */ + u32 security_reg; /* 0x38 */ + u32 channel_swid; /* 0x3c */ + u32 rsvd[1]; + u32 chan_wt_reg0; /* 0x44 */ + u32 chan_wt_reg1; /* 0x48 */ + u32 chan_wt_reg2; /* 0x4c */ + u32 chan_wr_reg3; /* 0x50 */ + u32 channel_swid1; /* 0x54 */ +} __attribute__((packed)); +check_member(apb_dma, channel_swid1, 0x54); + +/* + * Naming in the doc included a superfluous _CHANNEL_n_ for + * each entry and was left out for the sake of conciseness. + */ +#define APB_CSR_ENB (1 << 31) +#define APB_CSR_IE_EOC (1 << 30) +#define APB_CSR_HOLD (1 << 29) +#define APB_CSR_DIR (1 << 28) +#define APB_CSR_ONCE (1 << 27) +#define APB_CSR_FLOW (1 << 21) +#define APB_CSR_REQ_SEL_MASK 0x1f +#define APB_CSR_REQ_SEL_SHIFT 16 + +enum apbdmachan_req_sel { + APBDMA_SLAVE_CNTR_REQ = 0, + APBDMA_SLAVE_APBIF_CH0 = 1, + APBDMA_SLAVE_APBIF_CH1 = 2, + APBDMA_SLAVE_APBIF_CH2 = 3, + APBDMA_SLAVE_APBIF_CH3 = 4, + APBDMA_SLAVE_HSI = 5, + APBDMA_SLAVE_APBIF_CH4 = 6, + APBDMA_SLAVE_APBIF_CH5 = 7, + APBDMA_SLAVE_UART_A = 8, + APBDMA_SLAVE_UART_B = 9, + APBDMA_SLAVE_UART_C = 10, + APBDMA_SLAVE_DTV = 11, + APBDMA_SLAVE_APBIF_CH6 = 12, + APBDMA_SLAVE_APBIF_CH7 = 13, + APBDMA_SLAVE_APBIF_CH8 = 14, + APBDMA_SLAVE_SL2B1 = 15, + APBDMA_SLAVE_SL2B2 = 16, + APBDMA_SLAVE_SL2B3 = 17, + APBDMA_SLAVE_SL2B4 = 18, + APBDMA_SLAVE_UART_D = 19, + APBDMA_SLAVE_UART_E = 20, + APBDMA_SLAVE_I2C = 21, + APBDMA_SLAVE_I2C2 = 22, + APBDMA_SLAVE_I2C3 = 23, + APBDMA_SLAVE_DVC_I2C = 24, + APBDMA_SLAVE_OWR = 25, + APBDMA_SLAVE_I2C4 = 26, + APBDMA_SLAVE_SL2B5 = 27, + APBDMA_SLAVE_SL2B6 = 28, + APBDMA_SLAVE_APBIF_CH9 = 29, + APBDMA_SLAVE_I2C6 = 30, + APBDMA_SLAVE_NA31 = 31, +}; + +#define APB_STA_BSY (1 << 31) +#define APB_STA_ISE_EOC (1 << 30) +#define APB_STA_HALT (1 << 29) +#define APB_STA_PING_PONG_STA (1 << 28) +#define APB_STA_DMA_ACTIVITY (1 << 27) +#define APB_STA_CHANNEL_PAUSE (1 << 26) + +#define APB_CSRE_CHANNEL_PAUSE (1 << 31) +#define APB_CSRE_TRIG_SEL_MASK 0x3f +#define APB_CSRE_TRIG_SEL_SHIFT 14 + +#define AHB_PTR_MASK (0x3fffffff) +#define AHB_PTR_SHIFT 2 + +#define AHB_SEQ_INTR_ENB (1 << 31) +#define AHB_BUS_WIDTH_MASK 0x7 +#define AHB_BUS_WIDTH_SHIFT 28 +#define AHB_DATA_SWAP (1 << 27) +#define AHB_BURST_MASK 0x7 +#define AHB_BURST_SHIFT 24 +#define AHB_SEQ_DBL_BUF (1 << 19) +#define AHB_SEQ_WRAP_MASK 0x7 +#define AHB_SEQ_WRAP_SHIFT 16 + +#define APB_PTR_MASK 0x3fffffff +#define APB_PTR_SHIFT 2 + +#define APB_BUS_WIDTH_MASK 0x7 +#define APB_BUS_WIDTH_SHIFT 28 +#define APB_DATA_SWAP (1 << 27) +#define APB_ADDR_WRAP_MASK 0x7 +#define APB_ADDR_WRAP_SHIFT 16 + +#define APB_WORD_TRANSFER_MASK 0x0fffffff +#define APB_WORD_TRANSFER_SHIFT 2 + +struct apb_dma_channel_regs { + u32 csr; /* 0x00 */ + u32 sta; /* 0x04 */ + u32 dma_byte_sta; /* 0x08 */ + u32 csre; /* 0x0c */ + u32 ahb_ptr; /* 0x10 */ + u32 ahb_seq; /* 0x14 */ + u32 apb_ptr; /* 0x18 */ + u32 apb_seq; /* 0x1c */ + u32 wcount; /* 0x20 */ + u32 word_transfer; /* 0x24 */ +} __attribute__((packed)); +check_member(apb_dma_channel_regs, word_transfer, 0x24); + +struct apb_dma_channel { + const int num; + struct apb_dma_channel_regs *regs; + + /* + * Basic high-level semaphore that can be used to "claim" + * a DMA channel e.g. by SPI, I2C, or other peripheral driver. + */ + int in_use; +}; + +struct apb_dma_channel * const dma_claim(void); +void dma_release(struct apb_dma_channel * const channel); +int dma_start(struct apb_dma_channel * const channel); +int dma_stop(struct apb_dma_channel * const channel); +int dma_busy(struct apb_dma_channel * const channel); + +#endif /* __NVIDIA_TEGRA132_DMA_H__ */ |