Merge tag 'gpio-updates-for-v6.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel...
[linux-2.6-microblaze.git] / drivers / spi / spi-dw.h
1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __SPI_DW_H__
3 #define __SPI_DW_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 #include <linux/bitfield.h>
13
14 /* Synopsys DW SSI IP-core virtual IDs */
15 #define DW_PSSI_ID                      0
16 #define DW_HSSI_ID                      1
17
18 /* Synopsys DW SSI component versions (FourCC sequence) */
19 #define DW_HSSI_102A                    0x3130322a
20
21 /* DW SSI IP-core ID and version check helpers */
22 #define dw_spi_ip_is(_dws, _ip) \
23         ((_dws)->ip == DW_ ## _ip ## _ID)
24
25 #define __dw_spi_ver_cmp(_dws, _ip, _ver, _op) \
26         (dw_spi_ip_is(_dws, _ip) && (_dws)->ver _op DW_ ## _ip ## _ ## _ver)
27
28 #define dw_spi_ver_is(_dws, _ip, _ver) __dw_spi_ver_cmp(_dws, _ip, _ver, ==)
29
30 #define dw_spi_ver_is_ge(_dws, _ip, _ver) __dw_spi_ver_cmp(_dws, _ip, _ver, >=)
31
32 /* DW SPI controller capabilities */
33 #define DW_SPI_CAP_CS_OVERRIDE          BIT(0)
34 #define DW_SPI_CAP_DFS32                BIT(1)
35
36 /* Register offsets (Generic for both DWC APB SSI and DWC SSI IP-cores) */
37 #define DW_SPI_CTRLR0                   0x00
38 #define DW_SPI_CTRLR1                   0x04
39 #define DW_SPI_SSIENR                   0x08
40 #define DW_SPI_MWCR                     0x0c
41 #define DW_SPI_SER                      0x10
42 #define DW_SPI_BAUDR                    0x14
43 #define DW_SPI_TXFTLR                   0x18
44 #define DW_SPI_RXFTLR                   0x1c
45 #define DW_SPI_TXFLR                    0x20
46 #define DW_SPI_RXFLR                    0x24
47 #define DW_SPI_SR                       0x28
48 #define DW_SPI_IMR                      0x2c
49 #define DW_SPI_ISR                      0x30
50 #define DW_SPI_RISR                     0x34
51 #define DW_SPI_TXOICR                   0x38
52 #define DW_SPI_RXOICR                   0x3c
53 #define DW_SPI_RXUICR                   0x40
54 #define DW_SPI_MSTICR                   0x44
55 #define DW_SPI_ICR                      0x48
56 #define DW_SPI_DMACR                    0x4c
57 #define DW_SPI_DMATDLR                  0x50
58 #define DW_SPI_DMARDLR                  0x54
59 #define DW_SPI_IDR                      0x58
60 #define DW_SPI_VERSION                  0x5c
61 #define DW_SPI_DR                       0x60
62 #define DW_SPI_RX_SAMPLE_DLY            0xf0
63 #define DW_SPI_CS_OVERRIDE              0xf4
64
65 /* Bit fields in CTRLR0 (DWC APB SSI) */
66 #define DW_PSSI_CTRLR0_DFS_MASK                 GENMASK(3, 0)
67 #define DW_PSSI_CTRLR0_DFS32_MASK               GENMASK(20, 16)
68
69 #define DW_PSSI_CTRLR0_FRF_MASK                 GENMASK(5, 4)
70 #define DW_SPI_CTRLR0_FRF_MOTO_SPI              0x0
71 #define DW_SPI_CTRLR0_FRF_TI_SSP                0x1
72 #define DW_SPI_CTRLR0_FRF_NS_MICROWIRE          0x2
73 #define DW_SPI_CTRLR0_FRF_RESV                  0x3
74
75 #define DW_PSSI_CTRLR0_MODE_MASK                GENMASK(7, 6)
76 #define DW_PSSI_CTRLR0_SCPHA                    BIT(6)
77 #define DW_PSSI_CTRLR0_SCPOL                    BIT(7)
78
79 #define DW_PSSI_CTRLR0_TMOD_MASK                GENMASK(9, 8)
80 #define DW_SPI_CTRLR0_TMOD_TR                   0x0     /* xmit & recv */
81 #define DW_SPI_CTRLR0_TMOD_TO                   0x1     /* xmit only */
82 #define DW_SPI_CTRLR0_TMOD_RO                   0x2     /* recv only */
83 #define DW_SPI_CTRLR0_TMOD_EPROMREAD            0x3     /* eeprom read mode */
84
85 #define DW_PSSI_CTRLR0_SLV_OE                   BIT(10)
86 #define DW_PSSI_CTRLR0_SRL                      BIT(11)
87 #define DW_PSSI_CTRLR0_CFS                      BIT(12)
88
89 /* Bit fields in CTRLR0 (DWC SSI with AHB interface) */
90 #define DW_HSSI_CTRLR0_DFS_MASK                 GENMASK(4, 0)
91 #define DW_HSSI_CTRLR0_FRF_MASK                 GENMASK(7, 6)
92 #define DW_HSSI_CTRLR0_SCPHA                    BIT(8)
93 #define DW_HSSI_CTRLR0_SCPOL                    BIT(9)
94 #define DW_HSSI_CTRLR0_TMOD_MASK                GENMASK(11, 10)
95 #define DW_HSSI_CTRLR0_SRL                      BIT(13)
96 #define DW_HSSI_CTRLR0_MST                      BIT(31)
97
98 /* Bit fields in CTRLR1 */
99 #define DW_SPI_NDF_MASK                         GENMASK(15, 0)
100
101 /* Bit fields in SR, 7 bits */
102 #define DW_SPI_SR_MASK                          GENMASK(6, 0)
103 #define DW_SPI_SR_BUSY                          BIT(0)
104 #define DW_SPI_SR_TF_NOT_FULL                   BIT(1)
105 #define DW_SPI_SR_TF_EMPT                       BIT(2)
106 #define DW_SPI_SR_RF_NOT_EMPT                   BIT(3)
107 #define DW_SPI_SR_RF_FULL                       BIT(4)
108 #define DW_SPI_SR_TX_ERR                        BIT(5)
109 #define DW_SPI_SR_DCOL                          BIT(6)
110
111 /* Bit fields in ISR, IMR, RISR, 7 bits */
112 #define DW_SPI_INT_MASK                         GENMASK(5, 0)
113 #define DW_SPI_INT_TXEI                         BIT(0)
114 #define DW_SPI_INT_TXOI                         BIT(1)
115 #define DW_SPI_INT_RXUI                         BIT(2)
116 #define DW_SPI_INT_RXOI                         BIT(3)
117 #define DW_SPI_INT_RXFI                         BIT(4)
118 #define DW_SPI_INT_MSTI                         BIT(5)
119
120 /* Bit fields in DMACR */
121 #define DW_SPI_DMACR_RDMAE                      BIT(0)
122 #define DW_SPI_DMACR_TDMAE                      BIT(1)
123
124 /* Mem/DMA operations helpers */
125 #define DW_SPI_WAIT_RETRIES                     5
126 #define DW_SPI_BUF_SIZE \
127         (sizeof_field(struct spi_mem_op, cmd.opcode) + \
128          sizeof_field(struct spi_mem_op, addr.val) + 256)
129 #define DW_SPI_GET_BYTE(_val, _idx) \
130         ((_val) >> (BITS_PER_BYTE * (_idx)) & 0xff)
131
132 /* Slave spi_transfer/spi_mem_op related */
133 struct dw_spi_cfg {
134         u8 tmode;
135         u8 dfs;
136         u32 ndf;
137         u32 freq;
138 };
139
140 struct dw_spi;
141 struct dw_spi_dma_ops {
142         int (*dma_init)(struct device *dev, struct dw_spi *dws);
143         void (*dma_exit)(struct dw_spi *dws);
144         int (*dma_setup)(struct dw_spi *dws, struct spi_transfer *xfer);
145         bool (*can_dma)(struct spi_controller *host, struct spi_device *spi,
146                         struct spi_transfer *xfer);
147         int (*dma_transfer)(struct dw_spi *dws, struct spi_transfer *xfer);
148         void (*dma_stop)(struct dw_spi *dws);
149 };
150
151 struct dw_spi {
152         struct spi_controller   *host;
153
154         u32                     ip;             /* Synopsys DW SSI IP-core ID */
155         u32                     ver;            /* Synopsys component version */
156         u32                     caps;           /* DW SPI capabilities */
157
158         void __iomem            *regs;
159         unsigned long           paddr;
160         int                     irq;
161         u32                     fifo_len;       /* depth of the FIFO buffer */
162         unsigned int            dfs_offset;     /* CTRLR0 DFS field offset */
163         u32                     max_mem_freq;   /* max mem-ops bus freq */
164         u32                     max_freq;       /* max bus freq supported */
165
166         u32                     reg_io_width;   /* DR I/O width in bytes */
167         u16                     bus_num;
168         u16                     num_cs;         /* supported slave numbers */
169         void (*set_cs)(struct spi_device *spi, bool enable);
170
171         /* Current message transfer state info */
172         void                    *tx;
173         unsigned int            tx_len;
174         void                    *rx;
175         unsigned int            rx_len;
176         u8                      buf[DW_SPI_BUF_SIZE];
177         int                     dma_mapped;
178         u8                      n_bytes;        /* current is a 1/2 bytes op */
179         irqreturn_t             (*transfer_handler)(struct dw_spi *dws);
180         u32                     current_freq;   /* frequency in hz */
181         u32                     cur_rx_sample_dly;
182         u32                     def_rx_sample_dly_ns;
183
184         /* Custom memory operations */
185         struct spi_controller_mem_ops mem_ops;
186
187         /* DMA info */
188         struct dma_chan         *txchan;
189         u32                     txburst;
190         struct dma_chan         *rxchan;
191         u32                     rxburst;
192         u32                     dma_sg_burst;
193         u32                     dma_addr_widths;
194         unsigned long           dma_chan_busy;
195         dma_addr_t              dma_addr; /* phy address of the Data register */
196         const struct dw_spi_dma_ops *dma_ops;
197         struct completion       dma_completion;
198
199 #ifdef CONFIG_DEBUG_FS
200         struct dentry *debugfs;
201         struct debugfs_regset32 regset;
202 #endif
203 };
204
205 static inline u32 dw_readl(struct dw_spi *dws, u32 offset)
206 {
207         return __raw_readl(dws->regs + offset);
208 }
209
210 static inline void dw_writel(struct dw_spi *dws, u32 offset, u32 val)
211 {
212         __raw_writel(val, dws->regs + offset);
213 }
214
215 static inline u32 dw_read_io_reg(struct dw_spi *dws, u32 offset)
216 {
217         switch (dws->reg_io_width) {
218         case 2:
219                 return readw_relaxed(dws->regs + offset);
220         case 4:
221         default:
222                 return readl_relaxed(dws->regs + offset);
223         }
224 }
225
226 static inline void dw_write_io_reg(struct dw_spi *dws, u32 offset, u32 val)
227 {
228         switch (dws->reg_io_width) {
229         case 2:
230                 writew_relaxed(val, dws->regs + offset);
231                 break;
232         case 4:
233         default:
234                 writel_relaxed(val, dws->regs + offset);
235                 break;
236         }
237 }
238
239 static inline void dw_spi_enable_chip(struct dw_spi *dws, int enable)
240 {
241         dw_writel(dws, DW_SPI_SSIENR, (enable ? 1 : 0));
242 }
243
244 static inline void dw_spi_set_clk(struct dw_spi *dws, u16 div)
245 {
246         dw_writel(dws, DW_SPI_BAUDR, div);
247 }
248
249 /* Disable IRQ bits */
250 static inline void dw_spi_mask_intr(struct dw_spi *dws, u32 mask)
251 {
252         u32 new_mask;
253
254         new_mask = dw_readl(dws, DW_SPI_IMR) & ~mask;
255         dw_writel(dws, DW_SPI_IMR, new_mask);
256 }
257
258 /* Enable IRQ bits */
259 static inline void dw_spi_umask_intr(struct dw_spi *dws, u32 mask)
260 {
261         u32 new_mask;
262
263         new_mask = dw_readl(dws, DW_SPI_IMR) | mask;
264         dw_writel(dws, DW_SPI_IMR, new_mask);
265 }
266
267 /*
268  * This disables the SPI controller, interrupts, clears the interrupts status
269  * and CS, then re-enables the controller back. Transmit and receive FIFO
270  * buffers are cleared when the device is disabled.
271  */
272 static inline void dw_spi_reset_chip(struct dw_spi *dws)
273 {
274         dw_spi_enable_chip(dws, 0);
275         dw_spi_mask_intr(dws, 0xff);
276         dw_readl(dws, DW_SPI_ICR);
277         dw_writel(dws, DW_SPI_SER, 0);
278         dw_spi_enable_chip(dws, 1);
279 }
280
281 static inline void dw_spi_shutdown_chip(struct dw_spi *dws)
282 {
283         dw_spi_enable_chip(dws, 0);
284         dw_spi_set_clk(dws, 0);
285 }
286
287 extern void dw_spi_set_cs(struct spi_device *spi, bool enable);
288 extern void dw_spi_update_config(struct dw_spi *dws, struct spi_device *spi,
289                                  struct dw_spi_cfg *cfg);
290 extern int dw_spi_check_status(struct dw_spi *dws, bool raw);
291 extern int dw_spi_add_host(struct device *dev, struct dw_spi *dws);
292 extern void dw_spi_remove_host(struct dw_spi *dws);
293 extern int dw_spi_suspend_host(struct dw_spi *dws);
294 extern int dw_spi_resume_host(struct dw_spi *dws);
295
296 #ifdef CONFIG_SPI_DW_DMA
297
298 extern void dw_spi_dma_setup_mfld(struct dw_spi *dws);
299 extern void dw_spi_dma_setup_generic(struct dw_spi *dws);
300
301 #else
302
303 static inline void dw_spi_dma_setup_mfld(struct dw_spi *dws) {}
304 static inline void dw_spi_dma_setup_generic(struct dw_spi *dws) {}
305
306 #endif /* !CONFIG_SPI_DW_DMA */
307
308 #endif /* __SPI_DW_H__ */