1#ifndef DW_SPI_HEADER_H 2#define DW_SPI_HEADER_H 3 4#include <linux/io.h> 5#include <linux/scatterlist.h> 6#include <linux/gpio.h> 7 8/* Register offsets */ 9#define DW_SPI_CTRL0 0x00 10#define DW_SPI_CTRL1 0x04 11#define DW_SPI_SSIENR 0x08 12#define DW_SPI_MWCR 0x0c 13#define DW_SPI_SER 0x10 14#define DW_SPI_BAUDR 0x14 15#define DW_SPI_TXFLTR 0x18 16#define DW_SPI_RXFLTR 0x1c 17#define DW_SPI_TXFLR 0x20 18#define DW_SPI_RXFLR 0x24 19#define DW_SPI_SR 0x28 20#define DW_SPI_IMR 0x2c 21#define DW_SPI_ISR 0x30 22#define DW_SPI_RISR 0x34 23#define DW_SPI_TXOICR 0x38 24#define DW_SPI_RXOICR 0x3c 25#define DW_SPI_RXUICR 0x40 26#define DW_SPI_MSTICR 0x44 27#define DW_SPI_ICR 0x48 28#define DW_SPI_DMACR 0x4c 29#define DW_SPI_DMATDLR 0x50 30#define DW_SPI_DMARDLR 0x54 31#define DW_SPI_IDR 0x58 32#define DW_SPI_VERSION 0x5c 33#define DW_SPI_DR 0x60 34 35/* Bit fields in CTRLR0 */ 36#define SPI_DFS_OFFSET 0 37 38#define SPI_FRF_OFFSET 4 39#define SPI_FRF_SPI 0x0 40#define SPI_FRF_SSP 0x1 41#define SPI_FRF_MICROWIRE 0x2 42#define SPI_FRF_RESV 0x3 43 44#define SPI_MODE_OFFSET 6 45#define SPI_SCPH_OFFSET 6 46#define SPI_SCOL_OFFSET 7 47 48#define SPI_TMOD_OFFSET 8 49#define SPI_TMOD_MASK (0x3 << SPI_TMOD_OFFSET) 50#define SPI_TMOD_TR 0x0 /* xmit & recv */ 51#define SPI_TMOD_TO 0x1 /* xmit only */ 52#define SPI_TMOD_RO 0x2 /* recv only */ 53#define SPI_TMOD_EPROMREAD 0x3 /* eeprom read mode */ 54 55#define SPI_SLVOE_OFFSET 10 56#define SPI_SRL_OFFSET 11 57#define SPI_CFS_OFFSET 12 58 59/* Bit fields in SR, 7 bits */ 60#define SR_MASK 0x7f /* cover 7 bits */ 61#define SR_BUSY (1 << 0) 62#define SR_TF_NOT_FULL (1 << 1) 63#define SR_TF_EMPT (1 << 2) 64#define SR_RF_NOT_EMPT (1 << 3) 65#define SR_RF_FULL (1 << 4) 66#define SR_TX_ERR (1 << 5) 67#define SR_DCOL (1 << 6) 68 69/* Bit fields in ISR, IMR, RISR, 7 bits */ 70#define SPI_INT_TXEI (1 << 0) 71#define SPI_INT_TXOI (1 << 1) 72#define SPI_INT_RXUI (1 << 2) 73#define SPI_INT_RXOI (1 << 3) 74#define SPI_INT_RXFI (1 << 4) 75#define SPI_INT_MSTI (1 << 5) 76 77/* Bit fields in DMACR */ 78#define SPI_DMA_RDMAE (1 << 0) 79#define SPI_DMA_TDMAE (1 << 1) 80 81/* TX RX interrupt level threshold, max can be 256 */ 82#define SPI_INT_THRESHOLD 32 83 84enum dw_ssi_type { 85 SSI_MOTO_SPI = 0, 86 SSI_TI_SSP, 87 SSI_NS_MICROWIRE, 88}; 89 90struct dw_spi; 91struct dw_spi_dma_ops { 92 int (*dma_init)(struct dw_spi *dws); 93 void (*dma_exit)(struct dw_spi *dws); 94 int (*dma_setup)(struct dw_spi *dws, struct spi_transfer *xfer); 95 bool (*can_dma)(struct spi_master *master, struct spi_device *spi, 96 struct spi_transfer *xfer); 97 int (*dma_transfer)(struct dw_spi *dws, struct spi_transfer *xfer); 98 void (*dma_stop)(struct dw_spi *dws); 99}; 100 101struct dw_spi { 102 struct spi_master *master; 103 enum dw_ssi_type type; 104 char name[16]; 105 106 void __iomem *regs; 107 unsigned long paddr; 108 int irq; 109 u32 fifo_len; /* depth of the FIFO buffer */ 110 u32 max_freq; /* max bus freq supported */ 111 112 u32 reg_io_width; /* DR I/O width in bytes */ 113 u16 bus_num; 114 u16 num_cs; /* supported slave numbers */ 115 116 /* Current message transfer state info */ 117 size_t len; 118 void *tx; 119 void *tx_end; 120 void *rx; 121 void *rx_end; 122 int dma_mapped; 123 u8 n_bytes; /* current is a 1/2 bytes op */ 124 u32 dma_width; 125 irqreturn_t (*transfer_handler)(struct dw_spi *dws); 126 127 /* DMA info */ 128 int dma_inited; 129 struct dma_chan *txchan; 130 struct dma_chan *rxchan; 131 unsigned long dma_chan_busy; 132 dma_addr_t dma_addr; /* phy address of the Data register */ 133 struct dw_spi_dma_ops *dma_ops; 134 void *dma_tx; 135 void *dma_rx; 136 137 /* Bus interface info */ 138 void *priv; 139#ifdef CONFIG_DEBUG_FS 140 struct dentry *debugfs; 141#endif 142}; 143 144static inline u32 dw_readl(struct dw_spi *dws, u32 offset) 145{ 146 return __raw_readl(dws->regs + offset); 147} 148 149static inline u16 dw_readw(struct dw_spi *dws, u32 offset) 150{ 151 return __raw_readw(dws->regs + offset); 152} 153 154static inline void dw_writel(struct dw_spi *dws, u32 offset, u32 val) 155{ 156 __raw_writel(val, dws->regs + offset); 157} 158 159static inline void dw_writew(struct dw_spi *dws, u32 offset, u16 val) 160{ 161 __raw_writew(val, dws->regs + offset); 162} 163 164static inline u32 dw_read_io_reg(struct dw_spi *dws, u32 offset) 165{ 166 switch (dws->reg_io_width) { 167 case 2: 168 return dw_readw(dws, offset); 169 case 4: 170 default: 171 return dw_readl(dws, offset); 172 } 173} 174 175static inline void dw_write_io_reg(struct dw_spi *dws, u32 offset, u32 val) 176{ 177 switch (dws->reg_io_width) { 178 case 2: 179 dw_writew(dws, offset, val); 180 break; 181 case 4: 182 default: 183 dw_writel(dws, offset, val); 184 break; 185 } 186} 187 188static inline void spi_enable_chip(struct dw_spi *dws, int enable) 189{ 190 dw_writel(dws, DW_SPI_SSIENR, (enable ? 1 : 0)); 191} 192 193static inline void spi_set_clk(struct dw_spi *dws, u16 div) 194{ 195 dw_writel(dws, DW_SPI_BAUDR, div); 196} 197 198/* Disable IRQ bits */ 199static inline void spi_mask_intr(struct dw_spi *dws, u32 mask) 200{ 201 u32 new_mask; 202 203 new_mask = dw_readl(dws, DW_SPI_IMR) & ~mask; 204 dw_writel(dws, DW_SPI_IMR, new_mask); 205} 206 207/* Enable IRQ bits */ 208static inline void spi_umask_intr(struct dw_spi *dws, u32 mask) 209{ 210 u32 new_mask; 211 212 new_mask = dw_readl(dws, DW_SPI_IMR) | mask; 213 dw_writel(dws, DW_SPI_IMR, new_mask); 214} 215 216/* 217 * This does disable the SPI controller, interrupts, and re-enable the 218 * controller back. Transmit and receive FIFO buffers are cleared when the 219 * device is disabled. 220 */ 221static inline void spi_reset_chip(struct dw_spi *dws) 222{ 223 spi_enable_chip(dws, 0); 224 spi_mask_intr(dws, 0xff); 225 spi_enable_chip(dws, 1); 226} 227 228/* 229 * Each SPI slave device to work with dw_api controller should 230 * has such a structure claiming its working mode (poll or PIO/DMA), 231 * which can be save in the "controller_data" member of the 232 * struct spi_device. 233 */ 234struct dw_spi_chip { 235 u8 poll_mode; /* 1 for controller polling mode */ 236 u8 type; /* SPI/SSP/MicroWire */ 237 void (*cs_control)(u32 command); 238}; 239 240extern int dw_spi_add_host(struct device *dev, struct dw_spi *dws); 241extern void dw_spi_remove_host(struct dw_spi *dws); 242extern int dw_spi_suspend_host(struct dw_spi *dws); 243extern int dw_spi_resume_host(struct dw_spi *dws); 244 245/* platform related setup */ 246extern int dw_spi_mid_init(struct dw_spi *dws); /* Intel MID platforms */ 247#endif /* DW_SPI_HEADER_H */ 248