1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/bits.h>
6 #include <linux/completion.h>
7 #include <linux/debugfs.h>
8 #include <linux/irqreturn.h>
10 #include <linux/scatterlist.h>
11 #include <linux/spi/spi-mem.h>
12 #include <linux/bitfield.h>
14 /* Synopsys DW SSI IP-core virtual IDs */
18 /* Synopsys DW SSI component versions (FourCC sequence) */
19 #define DW_HSSI_102A 0x3130322a
21 /* DW SSI IP-core ID and version check helpers */
22 #define dw_spi_ip_is(_dws, _ip) \
23 ((_dws)->ip == DW_ ## _ip ## _ID)
25 #define __dw_spi_ver_cmp(_dws, _ip, _ver, _op) \
26 (dw_spi_ip_is(_dws, _ip) && (_dws)->ver _op DW_ ## _ip ## _ver)
28 #define dw_spi_ver_is(_dws, _ip, _ver) __dw_spi_ver_cmp(_dws, _ip, _ver, ==)
30 #define dw_spi_ver_is_ge(_dws, _ip, _ver) __dw_spi_ver_cmp(_dws, _ip, _ver, >=)
32 /* DW SPI controller capabilities */
33 #define DW_SPI_CAP_CS_OVERRIDE BIT(0)
34 #define DW_SPI_CAP_KEEMBAY_MST BIT(1)
35 #define DW_SPI_CAP_DFS32 BIT(2)
37 /* Register offsets (Generic for both DWC APB SSI and DWC SSI IP-cores) */
38 #define DW_SPI_CTRLR0 0x00
39 #define DW_SPI_CTRLR1 0x04
40 #define DW_SPI_SSIENR 0x08
41 #define DW_SPI_MWCR 0x0c
42 #define DW_SPI_SER 0x10
43 #define DW_SPI_BAUDR 0x14
44 #define DW_SPI_TXFTLR 0x18
45 #define DW_SPI_RXFTLR 0x1c
46 #define DW_SPI_TXFLR 0x20
47 #define DW_SPI_RXFLR 0x24
48 #define DW_SPI_SR 0x28
49 #define DW_SPI_IMR 0x2c
50 #define DW_SPI_ISR 0x30
51 #define DW_SPI_RISR 0x34
52 #define DW_SPI_TXOICR 0x38
53 #define DW_SPI_RXOICR 0x3c
54 #define DW_SPI_RXUICR 0x40
55 #define DW_SPI_MSTICR 0x44
56 #define DW_SPI_ICR 0x48
57 #define DW_SPI_DMACR 0x4c
58 #define DW_SPI_DMATDLR 0x50
59 #define DW_SPI_DMARDLR 0x54
60 #define DW_SPI_IDR 0x58
61 #define DW_SPI_VERSION 0x5c
62 #define DW_SPI_DR 0x60
63 #define DW_SPI_RX_SAMPLE_DLY 0xf0
64 #define DW_SPI_CS_OVERRIDE 0xf4
66 /* Bit fields in CTRLR0 (DWC APB SSI) */
67 #define DW_PSSI_CTRLR0_DFS_MASK GENMASK(3, 0)
68 #define DW_PSSI_CTRLR0_DFS32_MASK GENMASK(20, 16)
70 #define DW_PSSI_CTRLR0_FRF_MASK GENMASK(5, 4)
71 #define DW_SPI_CTRLR0_FRF_MOTO_SPI 0x0
72 #define DW_SPI_CTRLR0_FRF_TI_SSP 0x1
73 #define DW_SPI_CTRLR0_FRF_NS_MICROWIRE 0x2
74 #define DW_SPI_CTRLR0_FRF_RESV 0x3
76 #define DW_PSSI_CTRLR0_MODE_MASK GENMASK(7, 6)
77 #define DW_PSSI_CTRLR0_SCPHA BIT(6)
78 #define DW_PSSI_CTRLR0_SCPOL BIT(7)
80 #define DW_PSSI_CTRLR0_TMOD_MASK GENMASK(9, 8)
81 #define DW_SPI_CTRLR0_TMOD_TR 0x0 /* xmit & recv */
82 #define DW_SPI_CTRLR0_TMOD_TO 0x1 /* xmit only */
83 #define DW_SPI_CTRLR0_TMOD_RO 0x2 /* recv only */
84 #define DW_SPI_CTRLR0_TMOD_EPROMREAD 0x3 /* eeprom read mode */
86 #define DW_PSSI_CTRLR0_SLV_OE BIT(10)
87 #define DW_PSSI_CTRLR0_SRL BIT(11)
88 #define DW_PSSI_CTRLR0_CFS BIT(12)
90 /* Bit fields in CTRLR0 (DWC SSI with AHB interface) */
91 #define DW_HSSI_CTRLR0_DFS_MASK GENMASK(4, 0)
92 #define DW_HSSI_CTRLR0_FRF_MASK GENMASK(7, 6)
93 #define DW_HSSI_CTRLR0_SCPHA BIT(8)
94 #define DW_HSSI_CTRLR0_SCPOL BIT(9)
95 #define DW_HSSI_CTRLR0_TMOD_MASK GENMASK(11, 10)
96 #define DW_HSSI_CTRLR0_SRL BIT(13)
99 * For Keem Bay, CTRLR0[31] is used to select controller mode.
103 #define DW_HSSI_CTRLR0_KEEMBAY_MST BIT(31)
105 /* Bit fields in CTRLR1 */
106 #define DW_SPI_NDF_MASK GENMASK(15, 0)
108 /* Bit fields in SR, 7 bits */
109 #define DW_SPI_SR_MASK GENMASK(6, 0)
110 #define DW_SPI_SR_BUSY BIT(0)
111 #define DW_SPI_SR_TF_NOT_FULL BIT(1)
112 #define DW_SPI_SR_TF_EMPT BIT(2)
113 #define DW_SPI_SR_RF_NOT_EMPT BIT(3)
114 #define DW_SPI_SR_RF_FULL BIT(4)
115 #define DW_SPI_SR_TX_ERR BIT(5)
116 #define DW_SPI_SR_DCOL BIT(6)
118 /* Bit fields in ISR, IMR, RISR, 7 bits */
119 #define DW_SPI_INT_MASK GENMASK(5, 0)
120 #define DW_SPI_INT_TXEI BIT(0)
121 #define DW_SPI_INT_TXOI BIT(1)
122 #define DW_SPI_INT_RXUI BIT(2)
123 #define DW_SPI_INT_RXOI BIT(3)
124 #define DW_SPI_INT_RXFI BIT(4)
125 #define DW_SPI_INT_MSTI BIT(5)
127 /* Bit fields in DMACR */
128 #define DW_SPI_DMACR_RDMAE BIT(0)
129 #define DW_SPI_DMACR_TDMAE BIT(1)
131 /* Mem/DMA operations helpers */
132 #define DW_SPI_WAIT_RETRIES 5
133 #define DW_SPI_BUF_SIZE \
134 (sizeof_field(struct spi_mem_op, cmd.opcode) + \
135 sizeof_field(struct spi_mem_op, addr.val) + 256)
136 #define DW_SPI_GET_BYTE(_val, _idx) \
137 ((_val) >> (BITS_PER_BYTE * (_idx)) & 0xff)
139 /* Slave spi_transfer/spi_mem_op related */
148 struct dw_spi_dma_ops {
149 int (*dma_init)(struct device *dev, struct dw_spi *dws);
150 void (*dma_exit)(struct dw_spi *dws);
151 int (*dma_setup)(struct dw_spi *dws, struct spi_transfer *xfer);
152 bool (*can_dma)(struct spi_controller *master, struct spi_device *spi,
153 struct spi_transfer *xfer);
154 int (*dma_transfer)(struct dw_spi *dws, struct spi_transfer *xfer);
155 void (*dma_stop)(struct dw_spi *dws);
159 struct spi_controller *master;
161 u32 ip; /* Synopsys DW SSI IP-core ID */
162 u32 ver; /* Synopsys component version */
163 u32 caps; /* DW SPI capabilities */
168 u32 fifo_len; /* depth of the FIFO buffer */
169 unsigned int dfs_offset; /* CTRLR0 DFS field offset */
170 u32 max_mem_freq; /* max mem-ops bus freq */
171 u32 max_freq; /* max bus freq supported */
173 u32 reg_io_width; /* DR I/O width in bytes */
175 u16 num_cs; /* supported slave numbers */
176 void (*set_cs)(struct spi_device *spi, bool enable);
178 /* Current message transfer state info */
183 u8 buf[DW_SPI_BUF_SIZE];
185 u8 n_bytes; /* current is a 1/2 bytes op */
186 irqreturn_t (*transfer_handler)(struct dw_spi *dws);
187 u32 current_freq; /* frequency in hz */
188 u32 cur_rx_sample_dly;
189 u32 def_rx_sample_dly_ns;
191 /* Custom memory operations */
192 struct spi_controller_mem_ops mem_ops;
195 struct dma_chan *txchan;
197 struct dma_chan *rxchan;
200 unsigned long dma_chan_busy;
201 dma_addr_t dma_addr; /* phy address of the Data register */
202 const struct dw_spi_dma_ops *dma_ops;
203 struct completion dma_completion;
205 #ifdef CONFIG_DEBUG_FS
206 struct dentry *debugfs;
207 struct debugfs_regset32 regset;
211 static inline u32 dw_readl(struct dw_spi *dws, u32 offset)
213 return __raw_readl(dws->regs + offset);
216 static inline void dw_writel(struct dw_spi *dws, u32 offset, u32 val)
218 __raw_writel(val, dws->regs + offset);
221 static inline u32 dw_read_io_reg(struct dw_spi *dws, u32 offset)
223 switch (dws->reg_io_width) {
225 return readw_relaxed(dws->regs + offset);
228 return readl_relaxed(dws->regs + offset);
232 static inline void dw_write_io_reg(struct dw_spi *dws, u32 offset, u32 val)
234 switch (dws->reg_io_width) {
236 writew_relaxed(val, dws->regs + offset);
240 writel_relaxed(val, dws->regs + offset);
245 static inline void dw_spi_enable_chip(struct dw_spi *dws, int enable)
247 dw_writel(dws, DW_SPI_SSIENR, (enable ? 1 : 0));
250 static inline void dw_spi_set_clk(struct dw_spi *dws, u16 div)
252 dw_writel(dws, DW_SPI_BAUDR, div);
255 /* Disable IRQ bits */
256 static inline void dw_spi_mask_intr(struct dw_spi *dws, u32 mask)
260 new_mask = dw_readl(dws, DW_SPI_IMR) & ~mask;
261 dw_writel(dws, DW_SPI_IMR, new_mask);
264 /* Enable IRQ bits */
265 static inline void dw_spi_umask_intr(struct dw_spi *dws, u32 mask)
269 new_mask = dw_readl(dws, DW_SPI_IMR) | mask;
270 dw_writel(dws, DW_SPI_IMR, new_mask);
274 * This disables the SPI controller, interrupts, clears the interrupts status
275 * and CS, then re-enables the controller back. Transmit and receive FIFO
276 * buffers are cleared when the device is disabled.
278 static inline void dw_spi_reset_chip(struct dw_spi *dws)
280 dw_spi_enable_chip(dws, 0);
281 dw_spi_mask_intr(dws, 0xff);
282 dw_readl(dws, DW_SPI_ICR);
283 dw_writel(dws, DW_SPI_SER, 0);
284 dw_spi_enable_chip(dws, 1);
287 static inline void dw_spi_shutdown_chip(struct dw_spi *dws)
289 dw_spi_enable_chip(dws, 0);
290 dw_spi_set_clk(dws, 0);
293 extern void dw_spi_set_cs(struct spi_device *spi, bool enable);
294 extern void dw_spi_update_config(struct dw_spi *dws, struct spi_device *spi,
295 struct dw_spi_cfg *cfg);
296 extern int dw_spi_check_status(struct dw_spi *dws, bool raw);
297 extern int dw_spi_add_host(struct device *dev, struct dw_spi *dws);
298 extern void dw_spi_remove_host(struct dw_spi *dws);
299 extern int dw_spi_suspend_host(struct dw_spi *dws);
300 extern int dw_spi_resume_host(struct dw_spi *dws);
302 #ifdef CONFIG_SPI_DW_DMA
304 extern void dw_spi_dma_setup_mfld(struct dw_spi *dws);
305 extern void dw_spi_dma_setup_generic(struct dw_spi *dws);
309 static inline void dw_spi_dma_setup_mfld(struct dw_spi *dws) {}
310 static inline void dw_spi_dma_setup_generic(struct dw_spi *dws) {}
312 #endif /* !CONFIG_SPI_DW_DMA */
314 #endif /* __SPI_DW_H__ */