/* SPDX-License-Identifier: GPL-2.0 */ #ifndef DW_SPI_HEADER_H #define DW_SPI_HEADER_H #include <linux/io.h> #include <linux/scatterlist.h> /* Register offsets */ #define DW_SPI_CTRL0 0x00 #define DW_SPI_CTRL1 0x04 #define DW_SPI_SSIENR 0x08 #define DW_SPI_MWCR 0x0c #define DW_SPI_SER 0x10 #define DW_SPI_BAUDR 0x14 #define DW_SPI_TXFLTR 0x18 #define DW_SPI_RXFLTR 0x1c #define DW_SPI_TXFLR 0x20 #define DW_SPI_RXFLR 0x24 #define DW_SPI_SR 0x28 #define DW_SPI_IMR 0x2c #define DW_SPI_ISR 0x30 #define DW_SPI_RISR 0x34 #define DW_SPI_TXOICR 0x38 #define DW_SPI_RXOICR 0x3c #define DW_SPI_RXUICR 0x40 #define DW_SPI_MSTICR 0x44 #define DW_SPI_ICR 0x48 #define DW_SPI_DMACR 0x4c #define DW_SPI_DMATDLR 0x50 #define DW_SPI_DMARDLR 0x54 #define DW_SPI_IDR 0x58 #define DW_SPI_VERSION 0x5c #define DW_SPI_DR 0x60 #define DW_SPI_CS_OVERRIDE 0xf4 /* Bit fields in CTRLR0 */ #define SPI_DFS_OFFSET 0 #define SPI_FRF_OFFSET 4 #define SPI_FRF_SPI 0x0 #define SPI_FRF_SSP 0x1 #define SPI_FRF_MICROWIRE 0x2 #define SPI_FRF_RESV 0x3 #define SPI_MODE_OFFSET 6 #define SPI_SCPH_OFFSET 6 #define SPI_SCOL_OFFSET 7 #define SPI_TMOD_OFFSET 8 #define SPI_TMOD_MASK (0x3 << SPI_TMOD_OFFSET) #define SPI_TMOD_TR 0x0 /* xmit & recv */ #define SPI_TMOD_TO 0x1 /* xmit only */ #define SPI_TMOD_RO 0x2 /* recv only */ #define SPI_TMOD_EPROMREAD 0x3 /* eeprom read mode */ #define SPI_SLVOE_OFFSET 10 #define SPI_SRL_OFFSET 11 #define SPI_CFS_OFFSET 12 /* Bit fields in SR, 7 bits */ #define SR_MASK 0x7f /* cover 7 bits */ #define SR_BUSY (1 << 0) #define SR_TF_NOT_FULL (1 << 1) #define SR_TF_EMPT (1 << 2) #define SR_RF_NOT_EMPT (1 << 3) #define SR_RF_FULL (1 << 4) #define SR_TX_ERR (1 << 5) #define SR_DCOL (1 << 6) /* Bit fields in ISR, IMR, RISR, 7 bits */ #define SPI_INT_TXEI (1 << 0) #define SPI_INT_TXOI (1 << 1) #define SPI_INT_RXUI (1 << 2) #define SPI_INT_RXOI (1 << 3) #define SPI_INT_RXFI (1 << 4) #define SPI_INT_MSTI (1 << 5) /* Bit fields in DMACR */ #define SPI_DMA_RDMAE (1 << 0) #define SPI_DMA_TDMAE (1 << 1) /* TX RX interrupt level threshold, max can be 256 */ #define SPI_INT_THRESHOLD 32 enum dw_ssi_type { SSI_MOTO_SPI = 0, SSI_TI_SSP, SSI_NS_MICROWIRE, }; struct dw_spi; struct dw_spi_dma_ops { int (*dma_init)(struct dw_spi *dws); void (*dma_exit)(struct dw_spi *dws); int (*dma_setup)(struct dw_spi *dws, struct spi_transfer *xfer); bool (*can_dma)(struct spi_controller *master, struct spi_device *spi, struct spi_transfer *xfer); int (*dma_transfer)(struct dw_spi *dws, struct spi_transfer *xfer); void (*dma_stop)(struct dw_spi *dws); }; struct dw_spi { struct spi_controller *master; enum dw_ssi_type type; void __iomem *regs; unsigned long paddr; int irq; u32 fifo_len; /* depth of the FIFO buffer */ u32 max_freq; /* max bus freq supported */ int cs_override; u32 reg_io_width; /* DR I/O width in bytes */ u16 bus_num; u16 num_cs; /* supported slave numbers */ void (*set_cs)(struct spi_device *spi, bool enable); /* Current message transfer state info */ size_t len; void *tx; void *tx_end; spinlock_t buf_lock; void *rx; void *rx_end; int dma_mapped; u8 n_bytes; /* current is a 1/2 bytes op */ u32 dma_width; irqreturn_t (*transfer_handler)(struct dw_spi *dws); u32 current_freq; /* frequency in hz */ /* DMA info */ int dma_inited; struct dma_chan *txchan; struct dma_chan *rxchan; unsigned long dma_chan_busy; dma_addr_t dma_addr; /* phy address of the Data register */ const struct dw_spi_dma_ops *dma_ops; void *dma_tx; void *dma_rx; /* Bus interface info */ void *priv; #ifdef CONFIG_DEBUG_FS struct dentry *debugfs; #endif }; static inline u32 dw_readl(struct dw_spi *dws, u32 offset) { return __raw_readl(dws->regs + offset); } static inline u16 dw_readw(struct dw_spi *dws, u32 offset) { return __raw_readw(dws->regs + offset); } static inline void dw_writel(struct dw_spi *dws, u32 offset, u32 val) { __raw_writel(val, dws->regs + offset); } static inline void dw_writew(struct dw_spi *dws, u32 offset, u16 val) { __raw_writew(val, dws->regs + offset); } static inline u32 dw_read_io_reg(struct dw_spi *dws, u32 offset) { switch (dws->reg_io_width) { case 2: return dw_readw(dws, offset); case 4: default: return dw_readl(dws, offset); } } static inline void dw_write_io_reg(struct dw_spi *dws, u32 offset, u32 val) { switch (dws->reg_io_width) { case 2: dw_writew(dws, offset, val); break; case 4: default: dw_writel(dws, offset, val); break; } } static inline void spi_enable_chip(struct dw_spi *dws, int enable) { dw_writel(dws, DW_SPI_SSIENR, (enable ? 1 : 0)); } static inline void spi_set_clk(struct dw_spi *dws, u16 div) { dw_writel(dws, DW_SPI_BAUDR, div); } /* Disable IRQ bits */ static inline void spi_mask_intr(struct dw_spi *dws, u32 mask) { u32 new_mask; new_mask = dw_readl(dws, DW_SPI_IMR) & ~mask; dw_writel(dws, DW_SPI_IMR, new_mask); } /* Enable IRQ bits */ static inline void spi_umask_intr(struct dw_spi *dws, u32 mask) { u32 new_mask; new_mask = dw_readl(dws, DW_SPI_IMR) | mask; dw_writel(dws, DW_SPI_IMR, new_mask); } /* * This does disable the SPI controller, interrupts, and re-enable the * controller back. Transmit and receive FIFO buffers are cleared when the * device is disabled. */ static inline void spi_reset_chip(struct dw_spi *dws) { spi_enable_chip(dws, 0); spi_mask_intr(dws, 0xff); spi_enable_chip(dws, 1); } static inline void spi_shutdown_chip(struct dw_spi *dws) { spi_enable_chip(dws, 0); spi_set_clk(dws, 0); } /* * Each SPI slave device to work with dw_api controller should * has such a structure claiming its working mode (poll or PIO/DMA), * which can be save in the "controller_data" member of the * struct spi_device. */ struct dw_spi_chip { u8 poll_mode; /* 1 for controller polling mode */ u8 type; /* SPI/SSP/MicroWire */ void (*cs_control)(u32 command); }; extern void dw_spi_set_cs(struct spi_device *spi, bool enable); extern int dw_spi_add_host(struct device *dev, struct dw_spi *dws); extern void dw_spi_remove_host(struct dw_spi *dws); extern int dw_spi_suspend_host(struct dw_spi *dws); extern int dw_spi_resume_host(struct dw_spi *dws); /* platform related setup */ extern int dw_spi_mid_init(struct dw_spi *dws); /* Intel MID platforms */ #endif /* DW_SPI_HEADER_H */