spi.h

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/* SPDX-License-Identifier: GPL-2.0-only */
 
#ifndef CPU_SAMSUNG_EXYNOS5250_SPI_H
#define CPU_SAMSUNG_EXYNOS5250_SPI_H
 
#include <boot_device.h>
 
/* SPI peripheral register map; padded to 64KB */
struct exynos_spi {
        unsigned int            ch_cfg;         /* 0x00 */
        unsigned char           reserved0[4];
        unsigned int            mode_cfg;       /* 0x08 */
        unsigned int            cs_reg;         /* 0x0c */
        unsigned char           reserved1[4];
        unsigned int            spi_sts;        /* 0x14 */
        unsigned int            tx_data;        /* 0x18 */
        unsigned int            rx_data;        /* 0x1c */
        unsigned int            pkt_cnt;        /* 0x20 */
        unsigned char           reserved2[4];
        unsigned int            swap_cfg;       /* 0x28 */
        unsigned int            fb_clk;         /* 0x2c */
        unsigned char           padding[0xffd0];
};
check_member(exynos_spi, fb_clk, 0x2c);
 
#define EXYNOS_SPI_MAX_FREQ     50000000
 
#define SPI_TIMEOUT_MS          10
 
#define SF_READ_DATA_CMD        0x3
 
/* SPI_CHCFG */
#define SPI_CH_HS_EN            (1 << 6)
#define SPI_CH_RST              (1 << 5)
#define SPI_SLAVE_MODE          (1 << 4)
#define SPI_CH_CPOL_L           (1 << 3)
#define SPI_CH_CPHA_B           (1 << 2)
#define SPI_RX_CH_ON            (1 << 1)
#define SPI_TX_CH_ON            (1 << 0)
 
/* SPI_MODECFG */
#define SPI_MODE_CH_WIDTH_WORD  (0x2 << 29)
#define SPI_MODE_BUS_WIDTH_WORD (0x2 << 17)
 
/* SPI_CSREG */
#define SPI_SLAVE_SIG_INACT     (1 << 0)
 
/* SPI_STS */
#define SPI_ST_TX_DONE          (1 << 25)
#define SPI_FIFO_LVL_MASK       0x1ff
#define SPI_TX_LVL_OFFSET       6
#define SPI_RX_LVL_OFFSET       15
 
/* Feedback Delay */
#define SPI_CLK_BYPASS          (0 << 0)
#define SPI_FB_DELAY_90         (1 << 0)
#define SPI_FB_DELAY_180        (2 << 0)
#define SPI_FB_DELAY_270        (3 << 0)
 
/* Packet Count */
#define SPI_PACKET_CNT_EN       (1 << 16)
 
/* Swap config */
#define SPI_TX_SWAP_EN          (1 << 0)
#define SPI_TX_BYTE_SWAP        (1 << 2)
#define SPI_TX_HWORD_SWAP       (1 << 3)
#define SPI_TX_BYTE_SWAP        (1 << 2)
#define SPI_RX_SWAP_EN          (1 << 4)
#define SPI_RX_BYTE_SWAP        (1 << 6)
#define SPI_RX_HWORD_SWAP       (1 << 7)
 
/* API */
int exynos_spi_open(struct exynos_spi *regs);
int exynos_spi_read(struct exynos_spi *regs, void *dest, u32 len, u32 off);
int exynos_spi_close(struct exynos_spi *regs);
 
void exynos_init_spi_boot_device(void);
const struct region_device *exynos_spi_boot_device(void);
#endif