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 84 enum dw_ssi_type { 85 SSI_MOTO_SPI = 0, 86 SSI_TI_SSP, 87 SSI_NS_MICROWIRE, 88 }; 89 90 struct dw_spi; 91 struct dw_spi_dma_ops { 92 int (*dma_init)(struct dw_spi *dws); 93 void (*dma_exit)(struct dw_spi *dws); 94 int (*dma_transfer)(struct dw_spi *dws, int cs_change); 95 }; 96 97 struct dw_spi { 98 struct spi_master *master; 99 struct spi_device *cur_dev; 100 enum dw_ssi_type type; 101 char name[16]; 102 103 void __iomem *regs; 104 unsigned long paddr; 105 int irq; 106 u32 fifo_len; /* depth of the FIFO buffer */ 107 u32 max_freq; /* max bus freq supported */ 108 109 u16 bus_num; 110 u16 num_cs; /* supported slave numbers */ 111 112 /* Message Transfer pump */ 113 struct tasklet_struct pump_transfers; 114 115 /* Current message transfer state info */ 116 struct spi_message *cur_msg; 117 struct spi_transfer *cur_transfer; 118 struct chip_data *cur_chip; 119 struct chip_data *prev_chip; 120 size_t len; 121 void *tx; 122 void *tx_end; 123 void *rx; 124 void *rx_end; 125 int dma_mapped; 126 dma_addr_t rx_dma; 127 dma_addr_t tx_dma; 128 size_t rx_map_len; 129 size_t tx_map_len; 130 u8 n_bytes; /* current is a 1/2 bytes op */ 131 u8 max_bits_per_word; /* maxim is 16b */ 132 u32 dma_width; 133 irqreturn_t (*transfer_handler)(struct dw_spi *dws); 134 void (*cs_control)(u32 command); 135 136 /* Dma info */ 137 int dma_inited; 138 struct dma_chan *txchan; 139 struct scatterlist tx_sgl; 140 struct dma_chan *rxchan; 141 struct scatterlist rx_sgl; 142 int dma_chan_done; 143 struct device *dma_dev; 144 dma_addr_t dma_addr; /* phy address of the Data register */ 145 struct dw_spi_dma_ops *dma_ops; 146 void *dma_priv; /* platform relate info */ 147 148 /* Bus interface info */ 149 void *priv; 150 #ifdef CONFIG_DEBUG_FS 151 struct dentry *debugfs; 152 #endif 153 }; 154 155 static inline u32 dw_readl(struct dw_spi *dws, u32 offset) 156 { 157 return __raw_readl(dws->regs + offset); 158 } 159 160 static inline void dw_writel(struct dw_spi *dws, u32 offset, u32 val) 161 { 162 __raw_writel(val, dws->regs + offset); 163 } 164 165 static inline u16 dw_readw(struct dw_spi *dws, u32 offset) 166 { 167 return __raw_readw(dws->regs + offset); 168 } 169 170 static inline void dw_writew(struct dw_spi *dws, u32 offset, u16 val) 171 { 172 __raw_writew(val, dws->regs + offset); 173 } 174 175 static inline void spi_enable_chip(struct dw_spi *dws, int enable) 176 { 177 dw_writel(dws, DW_SPI_SSIENR, (enable ? 1 : 0)); 178 } 179 180 static inline void spi_set_clk(struct dw_spi *dws, u16 div) 181 { 182 dw_writel(dws, DW_SPI_BAUDR, div); 183 } 184 185 static inline void spi_chip_sel(struct dw_spi *dws, struct spi_device *spi, 186 int active) 187 { 188 u16 cs = spi->chip_select; 189 int gpio_val = active ? (spi->mode & SPI_CS_HIGH) : 190 !(spi->mode & SPI_CS_HIGH); 191 192 if (dws->cs_control) 193 dws->cs_control(active); 194 if (gpio_is_valid(spi->cs_gpio)) 195 gpio_set_value(spi->cs_gpio, gpio_val); 196 197 if (active) 198 dw_writel(dws, DW_SPI_SER, 1 << cs); 199 } 200 201 /* Disable IRQ bits */ 202 static inline void spi_mask_intr(struct dw_spi *dws, u32 mask) 203 { 204 u32 new_mask; 205 206 new_mask = dw_readl(dws, DW_SPI_IMR) & ~mask; 207 dw_writel(dws, DW_SPI_IMR, new_mask); 208 } 209 210 /* Enable IRQ bits */ 211 static inline void spi_umask_intr(struct dw_spi *dws, u32 mask) 212 { 213 u32 new_mask; 214 215 new_mask = dw_readl(dws, DW_SPI_IMR) | mask; 216 dw_writel(dws, DW_SPI_IMR, new_mask); 217 } 218 219 /* 220 * Each SPI slave device to work with dw_api controller should 221 * has such a structure claiming its working mode (PIO/DMA etc), 222 * which can be save in the "controller_data" member of the 223 * struct spi_device. 224 */ 225 struct dw_spi_chip { 226 u8 poll_mode; /* 1 for controller polling mode */ 227 u8 type; /* SPI/SSP/MicroWire */ 228 u8 enable_dma; 229 void (*cs_control)(u32 command); 230 }; 231 232 extern int dw_spi_add_host(struct device *dev, struct dw_spi *dws); 233 extern void dw_spi_remove_host(struct dw_spi *dws); 234 extern int dw_spi_suspend_host(struct dw_spi *dws); 235 extern int dw_spi_resume_host(struct dw_spi *dws); 236 extern void dw_spi_xfer_done(struct dw_spi *dws); 237 238 /* platform related setup */ 239 extern int dw_spi_mid_init(struct dw_spi *dws); /* Intel MID platforms */ 240 #endif /* DW_SPI_HEADER_H */ 241