1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef DW_SPI_HEADER_H 3 #define DW_SPI_HEADER_H 4 5 #include <linux/bits.h> 6 #include <linux/completion.h> 7 #include <linux/debugfs.h> 8 #include <linux/irqreturn.h> 9 #include <linux/io.h> 10 #include <linux/scatterlist.h> 11 #include <linux/spi/spi-mem.h> 12 13 /* Register offsets */ 14 #define DW_SPI_CTRLR0 0x00 15 #define DW_SPI_CTRLR1 0x04 16 #define DW_SPI_SSIENR 0x08 17 #define DW_SPI_MWCR 0x0c 18 #define DW_SPI_SER 0x10 19 #define DW_SPI_BAUDR 0x14 20 #define DW_SPI_TXFTLR 0x18 21 #define DW_SPI_RXFTLR 0x1c 22 #define DW_SPI_TXFLR 0x20 23 #define DW_SPI_RXFLR 0x24 24 #define DW_SPI_SR 0x28 25 #define DW_SPI_IMR 0x2c 26 #define DW_SPI_ISR 0x30 27 #define DW_SPI_RISR 0x34 28 #define DW_SPI_TXOICR 0x38 29 #define DW_SPI_RXOICR 0x3c 30 #define DW_SPI_RXUICR 0x40 31 #define DW_SPI_MSTICR 0x44 32 #define DW_SPI_ICR 0x48 33 #define DW_SPI_DMACR 0x4c 34 #define DW_SPI_DMATDLR 0x50 35 #define DW_SPI_DMARDLR 0x54 36 #define DW_SPI_IDR 0x58 37 #define DW_SPI_VERSION 0x5c 38 #define DW_SPI_DR 0x60 39 #define DW_SPI_RX_SAMPLE_DLY 0xf0 40 #define DW_SPI_CS_OVERRIDE 0xf4 41 42 /* Bit fields in CTRLR0 */ 43 #define SPI_DFS_OFFSET 0 44 45 #define SPI_FRF_OFFSET 4 46 #define SPI_FRF_SPI 0x0 47 #define SPI_FRF_SSP 0x1 48 #define SPI_FRF_MICROWIRE 0x2 49 #define SPI_FRF_RESV 0x3 50 51 #define SPI_MODE_OFFSET 6 52 #define SPI_SCPH_OFFSET 6 53 #define SPI_SCOL_OFFSET 7 54 55 #define SPI_TMOD_OFFSET 8 56 #define SPI_TMOD_MASK (0x3 << SPI_TMOD_OFFSET) 57 #define SPI_TMOD_TR 0x0 /* xmit & recv */ 58 #define SPI_TMOD_TO 0x1 /* xmit only */ 59 #define SPI_TMOD_RO 0x2 /* recv only */ 60 #define SPI_TMOD_EPROMREAD 0x3 /* eeprom read mode */ 61 62 #define SPI_SLVOE_OFFSET 10 63 #define SPI_SRL_OFFSET 11 64 #define SPI_CFS_OFFSET 12 65 66 /* Bit fields in CTRLR0 based on DWC_ssi_databook.pdf v1.01a */ 67 #define DWC_SSI_CTRLR0_SRL_OFFSET 13 68 #define DWC_SSI_CTRLR0_TMOD_OFFSET 10 69 #define DWC_SSI_CTRLR0_TMOD_MASK GENMASK(11, 10) 70 #define DWC_SSI_CTRLR0_SCPOL_OFFSET 9 71 #define DWC_SSI_CTRLR0_SCPH_OFFSET 8 72 #define DWC_SSI_CTRLR0_FRF_OFFSET 6 73 #define DWC_SSI_CTRLR0_DFS_OFFSET 0 74 75 /* 76 * For Keem Bay, CTRLR0[31] is used to select controller mode. 77 * 0: SSI is slave 78 * 1: SSI is master 79 */ 80 #define DWC_SSI_CTRLR0_KEEMBAY_MST BIT(31) 81 82 /* Bit fields in CTRLR1 */ 83 #define SPI_NDF_MASK GENMASK(15, 0) 84 85 /* Bit fields in SR, 7 bits */ 86 #define SR_MASK 0x7f /* cover 7 bits */ 87 #define SR_BUSY (1 << 0) 88 #define SR_TF_NOT_FULL (1 << 1) 89 #define SR_TF_EMPT (1 << 2) 90 #define SR_RF_NOT_EMPT (1 << 3) 91 #define SR_RF_FULL (1 << 4) 92 #define SR_TX_ERR (1 << 5) 93 #define SR_DCOL (1 << 6) 94 95 /* Bit fields in ISR, IMR, RISR, 7 bits */ 96 #define SPI_INT_TXEI (1 << 0) 97 #define SPI_INT_TXOI (1 << 1) 98 #define SPI_INT_RXUI (1 << 2) 99 #define SPI_INT_RXOI (1 << 3) 100 #define SPI_INT_RXFI (1 << 4) 101 #define SPI_INT_MSTI (1 << 5) 102 103 /* Bit fields in DMACR */ 104 #define SPI_DMA_RDMAE (1 << 0) 105 #define SPI_DMA_TDMAE (1 << 1) 106 107 #define SPI_WAIT_RETRIES 5 108 #define SPI_BUF_SIZE \ 109 (sizeof_field(struct spi_mem_op, cmd.opcode) + \ 110 sizeof_field(struct spi_mem_op, addr.val) + 256) 111 #define SPI_GET_BYTE(_val, _idx) \ 112 ((_val) >> (BITS_PER_BYTE * (_idx)) & 0xff) 113 114 enum dw_ssi_type { 115 SSI_MOTO_SPI = 0, 116 SSI_TI_SSP, 117 SSI_NS_MICROWIRE, 118 }; 119 120 /* DW SPI capabilities */ 121 #define DW_SPI_CAP_CS_OVERRIDE BIT(0) 122 #define DW_SPI_CAP_KEEMBAY_MST BIT(1) 123 #define DW_SPI_CAP_DWC_SSI BIT(2) 124 125 /* Slave spi_transfer/spi_mem_op related */ 126 struct dw_spi_cfg { 127 u8 tmode; 128 u8 dfs; 129 u32 ndf; 130 u32 freq; 131 }; 132 133 struct dw_spi; 134 struct dw_spi_dma_ops { 135 int (*dma_init)(struct device *dev, struct dw_spi *dws); 136 void (*dma_exit)(struct dw_spi *dws); 137 int (*dma_setup)(struct dw_spi *dws, struct spi_transfer *xfer); 138 bool (*can_dma)(struct spi_controller *master, struct spi_device *spi, 139 struct spi_transfer *xfer); 140 int (*dma_transfer)(struct dw_spi *dws, struct spi_transfer *xfer); 141 void (*dma_stop)(struct dw_spi *dws); 142 }; 143 144 struct dw_spi { 145 struct spi_controller *master; 146 147 void __iomem *regs; 148 unsigned long paddr; 149 int irq; 150 u32 fifo_len; /* depth of the FIFO buffer */ 151 u32 max_mem_freq; /* max mem-ops bus freq */ 152 u32 max_freq; /* max bus freq supported */ 153 154 u32 caps; /* DW SPI capabilities */ 155 156 u32 reg_io_width; /* DR I/O width in bytes */ 157 u16 bus_num; 158 u16 num_cs; /* supported slave numbers */ 159 void (*set_cs)(struct spi_device *spi, bool enable); 160 161 /* Current message transfer state info */ 162 void *tx; 163 unsigned int tx_len; 164 void *rx; 165 unsigned int rx_len; 166 u8 buf[SPI_BUF_SIZE]; 167 int dma_mapped; 168 u8 n_bytes; /* current is a 1/2 bytes op */ 169 irqreturn_t (*transfer_handler)(struct dw_spi *dws); 170 u32 current_freq; /* frequency in hz */ 171 u32 cur_rx_sample_dly; 172 u32 def_rx_sample_dly_ns; 173 174 /* Custom memory operations */ 175 struct spi_controller_mem_ops mem_ops; 176 177 /* DMA info */ 178 struct dma_chan *txchan; 179 u32 txburst; 180 struct dma_chan *rxchan; 181 u32 rxburst; 182 u32 dma_sg_burst; 183 unsigned long dma_chan_busy; 184 dma_addr_t dma_addr; /* phy address of the Data register */ 185 const struct dw_spi_dma_ops *dma_ops; 186 struct completion dma_completion; 187 188 #ifdef CONFIG_DEBUG_FS 189 struct dentry *debugfs; 190 struct debugfs_regset32 regset; 191 #endif 192 }; 193 194 static inline u32 dw_readl(struct dw_spi *dws, u32 offset) 195 { 196 return __raw_readl(dws->regs + offset); 197 } 198 199 static inline void dw_writel(struct dw_spi *dws, u32 offset, u32 val) 200 { 201 __raw_writel(val, dws->regs + offset); 202 } 203 204 static inline u32 dw_read_io_reg(struct dw_spi *dws, u32 offset) 205 { 206 switch (dws->reg_io_width) { 207 case 2: 208 return readw_relaxed(dws->regs + offset); 209 case 4: 210 default: 211 return readl_relaxed(dws->regs + offset); 212 } 213 } 214 215 static inline void dw_write_io_reg(struct dw_spi *dws, u32 offset, u32 val) 216 { 217 switch (dws->reg_io_width) { 218 case 2: 219 writew_relaxed(val, dws->regs + offset); 220 break; 221 case 4: 222 default: 223 writel_relaxed(val, dws->regs + offset); 224 break; 225 } 226 } 227 228 static inline void spi_enable_chip(struct dw_spi *dws, int enable) 229 { 230 dw_writel(dws, DW_SPI_SSIENR, (enable ? 1 : 0)); 231 } 232 233 static inline void spi_set_clk(struct dw_spi *dws, u16 div) 234 { 235 dw_writel(dws, DW_SPI_BAUDR, div); 236 } 237 238 /* Disable IRQ bits */ 239 static inline void spi_mask_intr(struct dw_spi *dws, u32 mask) 240 { 241 u32 new_mask; 242 243 new_mask = dw_readl(dws, DW_SPI_IMR) & ~mask; 244 dw_writel(dws, DW_SPI_IMR, new_mask); 245 } 246 247 /* Enable IRQ bits */ 248 static inline void spi_umask_intr(struct dw_spi *dws, u32 mask) 249 { 250 u32 new_mask; 251 252 new_mask = dw_readl(dws, DW_SPI_IMR) | mask; 253 dw_writel(dws, DW_SPI_IMR, new_mask); 254 } 255 256 /* 257 * This disables the SPI controller, interrupts, clears the interrupts status 258 * and CS, then re-enables the controller back. Transmit and receive FIFO 259 * buffers are cleared when the device is disabled. 260 */ 261 static inline void spi_reset_chip(struct dw_spi *dws) 262 { 263 spi_enable_chip(dws, 0); 264 spi_mask_intr(dws, 0xff); 265 dw_readl(dws, DW_SPI_ICR); 266 dw_writel(dws, DW_SPI_SER, 0); 267 spi_enable_chip(dws, 1); 268 } 269 270 static inline void spi_shutdown_chip(struct dw_spi *dws) 271 { 272 spi_enable_chip(dws, 0); 273 spi_set_clk(dws, 0); 274 } 275 276 extern void dw_spi_set_cs(struct spi_device *spi, bool enable); 277 extern void dw_spi_update_config(struct dw_spi *dws, struct spi_device *spi, 278 struct dw_spi_cfg *cfg); 279 extern int dw_spi_check_status(struct dw_spi *dws, bool raw); 280 extern int dw_spi_add_host(struct device *dev, struct dw_spi *dws); 281 extern void dw_spi_remove_host(struct dw_spi *dws); 282 extern int dw_spi_suspend_host(struct dw_spi *dws); 283 extern int dw_spi_resume_host(struct dw_spi *dws); 284 285 #ifdef CONFIG_SPI_DW_DMA 286 287 extern void dw_spi_dma_setup_mfld(struct dw_spi *dws); 288 extern void dw_spi_dma_setup_generic(struct dw_spi *dws); 289 290 #else 291 292 static inline void dw_spi_dma_setup_mfld(struct dw_spi *dws) {} 293 static inline void dw_spi_dma_setup_generic(struct dw_spi *dws) {} 294 295 #endif /* !CONFIG_SPI_DW_DMA */ 296 297 #endif /* DW_SPI_HEADER_H */ 298