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/*
* (C) Copyright 2010,2011
* NVIDIA Corporation <www.nvidia.com>
* Copyright (C) 2013 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_TEGRA124_DMA_H__
#define __NVIDIA_TEGRA124_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_TEGRA124_DMA_H__ */
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