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/*
* Copyright (c) 2013, NVIDIA CORPORATION. All rights reserved.
*
* 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.
*/
#ifndef __NVIDIA_TEGRA124_SPI_H__
#define __NVIDIA_TEGRA124_SPI_H__
#include <spi-generic.h>
#include <soc/dma.h>
#include <stddef.h>
struct tegra_spi_regs {
u32 command1; /* 0x000: SPI_COMMAND1 */
u32 command2; /* 0x004: SPI_COMMAND2 */
u32 timing1; /* 0x008: SPI_CS_TIM1 */
u32 timing2; /* 0x00c: SPI_CS_TIM2 */
u32 trans_status; /* 0x010: SPI_TRANS_STATUS */
u32 fifo_status; /* 0x014: SPI_FIFO_STATUS */
u32 tx_data; /* 0x018: SPI_TX_DATA */
u32 rx_data; /* 0x01c: SPI_RX_DATA */
u32 dma_ctl; /* 0x020: SPI_DMA_CTL */
u32 dma_blk; /* 0x024: SPI_DMA_BLK */
u32 rsvd[56]; /* 0x028-0x107: reserved */
u32 tx_fifo; /* 0x108: SPI_FIFO1 */
u32 rsvd2[31]; /* 0x10c-0x187 reserved */
u32 rx_fifo; /* 0x188: SPI_FIFO2 */
u32 spare_ctl; /* 0x18c: SPI_SPARE_CTRL */
} __attribute__((packed));
check_member(tegra_spi_regs, spare_ctl, 0x18c);
enum spi_xfer_mode {
XFER_MODE_NONE = 0,
XFER_MODE_PIO,
XFER_MODE_DMA,
};
struct tegra_spi_channel {
struct tegra_spi_regs *regs;
/* static configuration */
struct spi_slave slave;
unsigned int req_sel;
int dual_mode; /* for x2 transfers with bit interleaving */
/* context (used internally) */
u8 *in_buf, *out_buf;
struct apb_dma_channel *dma_out, *dma_in;
enum spi_xfer_mode xfer_mode;
};
struct tegra_spi_channel *tegra_spi_init(unsigned int bus);
#endif /* __NVIDIA_TEGRA124_SPI_H__ */
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