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/*
* SPI driver for rockchip
*
* (C) Copyright 2015 Google, Inc
*
* (C) Copyright 2008-2013 Rockchip Electronics
* Peter, Software Engineering, <superpeter.cai@gmail.com>.
*
* SPDX-License-Identifier: GPL-2.0+
*/
#ifndef __RK_SPI_H
#define __RK_SPI_H
struct rockchip_spi {
u32 ctrlr0;
u32 ctrlr1;
u32 enr;
u32 ser;
u32 baudr;
u32 txftlr;
u32 rxftlr;
u32 txflr;
u32 rxflr;
u32 sr;
u32 ipr;
u32 imr;
u32 isr;
u32 risr;
u32 icr;
u32 dmacr;
u32 dmatdlr;
u32 dmardlr; /* 0x44 */
u32 reserved[0xef];
u32 txdr[0x100]; /* 0x400 */
u32 rxdr[0x100]; /* 0x800 */
};
/* CTRLR0 */
enum {
DFS_SHIFT = 0, /* Data Frame Size */
DFS_MASK = 3,
DFS_4BIT = 0,
DFS_8BIT,
DFS_16BIT,
DFS_RESV,
CFS_SHIFT = 2, /* Control Frame Size */
CFS_MASK = 0xf,
SCPH_SHIFT = 6, /* Serial Clock Phase */
SCPH_MASK = 1,
SCPH_TOGMID = 0, /* SCLK toggles in middle of first data bit */
SCPH_TOGSTA, /* SCLK toggles at start of first data bit */
SCOL_SHIFT = 7, /* Serial Clock Polarity */
SCOL_MASK = 1,
SCOL_LOW = 0, /* Inactive state of serial clock is low */
SCOL_HIGH, /* Inactive state of serial clock is high */
CSM_SHIFT = 8, /* Chip Select Mode */
CSM_MASK = 0x3,
CSM_KEEP = 0, /* ss_n stays low after each frame */
CSM_HALF, /* ss_n high for half sclk_out cycles */
CSM_ONE, /* ss_n high for one sclk_out cycle */
CSM_RESV,
SSN_DELAY_SHIFT = 10, /* SSN to Sclk_out delay */
SSN_DELAY_MASK = 1,
SSN_DELAY_HALF = 0, /* 1/2 sclk_out cycle */
SSN_DELAY_ONE = 1, /* 1 sclk_out cycle */
SEM_SHIFT = 11, /* Serial Endian Mode */
SEM_MASK = 1,
SEM_LITTLE = 0, /* little endian */
SEM_BIG, /* big endian */
FBM_SHIFT = 12, /* First Bit Mode */
FBM_MASK = 1,
FBM_MSB = 0, /* first bit is MSB */
FBM_LSB, /* first bit in LSB */
HALF_WORD_TX_SHIFT = 13, /* Byte and Halfword Transform */
HALF_WORD_MASK = 1,
HALF_WORD_ON = 0, /* apb 16bit write/read, spi 8bit write/read */
HALF_WORD_OFF, /* apb 8bit write/read, spi 8bit write/read */
RXDSD_SHIFT = 14, /* Rxd Sample Delay, in cycles */
RXDSD_MASK = 3,
FRF_SHIFT = 16, /* Frame Format */
FRF_MASK = 3,
FRF_SPI = 0, /* Motorola SPI */
FRF_SSP, /* Texas Instruments SSP*/
FRF_MICROWIRE, /* National Semiconductors Microwire */
FRF_RESV,
TMOD_SHIFT = 18, /* Transfer Mode */
TMOD_MASK = 3,
TMOD_TR = 0, /* xmit & recv */
TMOD_TO, /* xmit only */
TMOD_RO, /* recv only */
TMOD_RESV,
OMOD_SHIFT = 20, /* Operation Mode */
OMOD_MASK = 1,
OMOD_MASTER = 0, /* Master Mode */
OMOD_SLAVE, /* Slave Mode */
};
/* SR */
enum {
SR_MASK = 0x7f,
SR_BUSY = 1 << 0,
SR_TF_FULL = 1 << 1,
SR_TF_EMPT = 1 << 2,
SR_RF_EMPT = 1 << 3,
SR_RF_FULL = 1 << 4,
};
#define ROCKCHIP_SPI_TIMEOUT_MS 1000
/*
* We limit the maximum bitrate to 50MBit/s (50MHz) due to an assumed
* hardware limitation... the Linux kernel source has the following
* comment:
* "sclk_out: spi master internal logic in rk3x can support 50Mhz"
*/
#define ROCKCHIP_SPI_MAX_RATE 50000000
#endif /* __RK_SPI_H */
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