tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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#include <linux/bitfield.h>
13
14/* Register offsets */
15#define DW_SPI_CTRLR0 0x00
16#define DW_SPI_CTRLR1 0x04
17#define DW_SPI_SSIENR 0x08
18#define DW_SPI_MWCR 0x0c
19#define DW_SPI_SER 0x10
20#define DW_SPI_BAUDR 0x14
21#define DW_SPI_TXFTLR 0x18
22#define DW_SPI_RXFTLR 0x1c
23#define DW_SPI_TXFLR 0x20
24#define DW_SPI_RXFLR 0x24
25#define DW_SPI_SR 0x28
26#define DW_SPI_IMR 0x2c
27#define DW_SPI_ISR 0x30
28#define DW_SPI_RISR 0x34
29#define DW_SPI_TXOICR 0x38
30#define DW_SPI_RXOICR 0x3c
31#define DW_SPI_RXUICR 0x40
32#define DW_SPI_MSTICR 0x44
33#define DW_SPI_ICR 0x48
34#define DW_SPI_DMACR 0x4c
35#define DW_SPI_DMATDLR 0x50
36#define DW_SPI_DMARDLR 0x54
37#define DW_SPI_IDR 0x58
38#define DW_SPI_VERSION 0x5c
39#define DW_SPI_DR 0x60
40#define DW_SPI_RX_SAMPLE_DLY 0xf0
41#define DW_SPI_CS_OVERRIDE 0xf4
42
43/* Bit fields in CTRLR0 */
44#define SPI_DFS_OFFSET 0
45#define SPI_DFS_MASK GENMASK(3, 0)
46#define SPI_DFS32_OFFSET 16
47
48#define SPI_FRF_OFFSET 4
49#define SPI_FRF_SPI 0x0
50#define SPI_FRF_SSP 0x1
51#define SPI_FRF_MICROWIRE 0x2
52#define SPI_FRF_RESV 0x3
53
54#define SPI_MODE_OFFSET 6
55#define SPI_SCPH_OFFSET 6
56#define SPI_SCOL_OFFSET 7
57
58#define SPI_TMOD_OFFSET 8
59#define SPI_TMOD_MASK (0x3 << SPI_TMOD_OFFSET)
60#define SPI_TMOD_TR 0x0 /* xmit & recv */
61#define SPI_TMOD_TO 0x1 /* xmit only */
62#define SPI_TMOD_RO 0x2 /* recv only */
63#define SPI_TMOD_EPROMREAD 0x3 /* eeprom read mode */
64
65#define SPI_SLVOE_OFFSET 10
66#define SPI_SRL_OFFSET 11
67#define SPI_CFS_OFFSET 12
68
69/* Bit fields in CTRLR0 based on DWC_ssi_databook.pdf v1.01a */
70#define DWC_SSI_CTRLR0_SRL_OFFSET 13
71#define DWC_SSI_CTRLR0_TMOD_OFFSET 10
72#define DWC_SSI_CTRLR0_TMOD_MASK GENMASK(11, 10)
73#define DWC_SSI_CTRLR0_SCPOL_OFFSET 9
74#define DWC_SSI_CTRLR0_SCPH_OFFSET 8
75#define DWC_SSI_CTRLR0_FRF_OFFSET 6
76#define DWC_SSI_CTRLR0_DFS_OFFSET 0
77
78/*
79 * For Keem Bay, CTRLR0[31] is used to select controller mode.
80 * 0: SSI is slave
81 * 1: SSI is master
82 */
83#define DWC_SSI_CTRLR0_KEEMBAY_MST BIT(31)
84
85/* Bit fields in CTRLR1 */
86#define SPI_NDF_MASK GENMASK(15, 0)
87
88/* Bit fields in SR, 7 bits */
89#define SR_MASK 0x7f /* cover 7 bits */
90#define SR_BUSY (1 << 0)
91#define SR_TF_NOT_FULL (1 << 1)
92#define SR_TF_EMPT (1 << 2)
93#define SR_RF_NOT_EMPT (1 << 3)
94#define SR_RF_FULL (1 << 4)
95#define SR_TX_ERR (1 << 5)
96#define SR_DCOL (1 << 6)
97
98/* Bit fields in ISR, IMR, RISR, 7 bits */
99#define SPI_INT_TXEI (1 << 0)
100#define SPI_INT_TXOI (1 << 1)
101#define SPI_INT_RXUI (1 << 2)
102#define SPI_INT_RXOI (1 << 3)
103#define SPI_INT_RXFI (1 << 4)
104#define SPI_INT_MSTI (1 << 5)
105
106/* Bit fields in DMACR */
107#define SPI_DMA_RDMAE (1 << 0)
108#define SPI_DMA_TDMAE (1 << 1)
109
110#define SPI_WAIT_RETRIES 5
111#define SPI_BUF_SIZE \
112 (sizeof_field(struct spi_mem_op, cmd.opcode) + \
113 sizeof_field(struct spi_mem_op, addr.val) + 256)
114#define SPI_GET_BYTE(_val, _idx) \
115 ((_val) >> (BITS_PER_BYTE * (_idx)) & 0xff)
116
117enum dw_ssi_type {
118 SSI_MOTO_SPI = 0,
119 SSI_TI_SSP,
120 SSI_NS_MICROWIRE,
121};
122
123/* DW SPI capabilities */
124#define DW_SPI_CAP_CS_OVERRIDE BIT(0)
125#define DW_SPI_CAP_KEEMBAY_MST BIT(1)
126#define DW_SPI_CAP_DWC_SSI BIT(2)
127#define DW_SPI_CAP_DFS32 BIT(3)
128
129/* Slave spi_transfer/spi_mem_op related */
130struct dw_spi_cfg {
131 u8 tmode;
132 u8 dfs;
133 u32 ndf;
134 u32 freq;
135};
136
137struct dw_spi;
138struct dw_spi_dma_ops {
139 int (*dma_init)(struct device *dev, struct dw_spi *dws);
140 void (*dma_exit)(struct dw_spi *dws);
141 int (*dma_setup)(struct dw_spi *dws, struct spi_transfer *xfer);
142 bool (*can_dma)(struct spi_controller *master, struct spi_device *spi,
143 struct spi_transfer *xfer);
144 int (*dma_transfer)(struct dw_spi *dws, struct spi_transfer *xfer);
145 void (*dma_stop)(struct dw_spi *dws);
146};
147
148struct dw_spi {
149 struct spi_controller *master;
150
151 void __iomem *regs;
152 unsigned long paddr;
153 int irq;
154 u32 fifo_len; /* depth of the FIFO buffer */
155 unsigned int dfs_offset; /* CTRLR0 DFS field offset */
156 u32 max_mem_freq; /* max mem-ops bus freq */
157 u32 max_freq; /* max bus freq supported */
158
159 u32 caps; /* DW SPI capabilities */
160
161 u32 reg_io_width; /* DR I/O width in bytes */
162 u16 bus_num;
163 u16 num_cs; /* supported slave numbers */
164 void (*set_cs)(struct spi_device *spi, bool enable);
165
166 /* Current message transfer state info */
167 void *tx;
168 unsigned int tx_len;
169 void *rx;
170 unsigned int rx_len;
171 u8 buf[SPI_BUF_SIZE];
172 int dma_mapped;
173 u8 n_bytes; /* current is a 1/2 bytes op */
174 irqreturn_t (*transfer_handler)(struct dw_spi *dws);
175 u32 current_freq; /* frequency in hz */
176 u32 cur_rx_sample_dly;
177 u32 def_rx_sample_dly_ns;
178
179 /* Custom memory operations */
180 struct spi_controller_mem_ops mem_ops;
181
182 /* DMA info */
183 struct dma_chan *txchan;
184 u32 txburst;
185 struct dma_chan *rxchan;
186 u32 rxburst;
187 u32 dma_sg_burst;
188 unsigned long dma_chan_busy;
189 dma_addr_t dma_addr; /* phy address of the Data register */
190 const struct dw_spi_dma_ops *dma_ops;
191 struct completion dma_completion;
192
193#ifdef CONFIG_DEBUG_FS
194 struct dentry *debugfs;
195 struct debugfs_regset32 regset;
196#endif
197};
198
199static inline u32 dw_readl(struct dw_spi *dws, u32 offset)
200{
201 return __raw_readl(dws->regs + offset);
202}
203
204static inline void dw_writel(struct dw_spi *dws, u32 offset, u32 val)
205{
206 __raw_writel(val, dws->regs + offset);
207}
208
209static inline u32 dw_read_io_reg(struct dw_spi *dws, u32 offset)
210{
211 switch (dws->reg_io_width) {
212 case 2:
213 return readw_relaxed(dws->regs + offset);
214 case 4:
215 default:
216 return readl_relaxed(dws->regs + offset);
217 }
218}
219
220static inline void dw_write_io_reg(struct dw_spi *dws, u32 offset, u32 val)
221{
222 switch (dws->reg_io_width) {
223 case 2:
224 writew_relaxed(val, dws->regs + offset);
225 break;
226 case 4:
227 default:
228 writel_relaxed(val, dws->regs + offset);
229 break;
230 }
231}
232
233static inline void spi_enable_chip(struct dw_spi *dws, int enable)
234{
235 dw_writel(dws, DW_SPI_SSIENR, (enable ? 1 : 0));
236}
237
238static inline void spi_set_clk(struct dw_spi *dws, u16 div)
239{
240 dw_writel(dws, DW_SPI_BAUDR, div);
241}
242
243/* Disable IRQ bits */
244static inline void spi_mask_intr(struct dw_spi *dws, u32 mask)
245{
246 u32 new_mask;
247
248 new_mask = dw_readl(dws, DW_SPI_IMR) & ~mask;
249 dw_writel(dws, DW_SPI_IMR, new_mask);
250}
251
252/* Enable IRQ bits */
253static inline void spi_umask_intr(struct dw_spi *dws, u32 mask)
254{
255 u32 new_mask;
256
257 new_mask = dw_readl(dws, DW_SPI_IMR) | mask;
258 dw_writel(dws, DW_SPI_IMR, new_mask);
259}
260
261/*
262 * This disables the SPI controller, interrupts, clears the interrupts status
263 * and CS, then re-enables the controller back. Transmit and receive FIFO
264 * buffers are cleared when the device is disabled.
265 */
266static inline void spi_reset_chip(struct dw_spi *dws)
267{
268 spi_enable_chip(dws, 0);
269 spi_mask_intr(dws, 0xff);
270 dw_readl(dws, DW_SPI_ICR);
271 dw_writel(dws, DW_SPI_SER, 0);
272 spi_enable_chip(dws, 1);
273}
274
275static inline void spi_shutdown_chip(struct dw_spi *dws)
276{
277 spi_enable_chip(dws, 0);
278 spi_set_clk(dws, 0);
279}
280
281extern void dw_spi_set_cs(struct spi_device *spi, bool enable);
282extern void dw_spi_update_config(struct dw_spi *dws, struct spi_device *spi,
283 struct dw_spi_cfg *cfg);
284extern int dw_spi_check_status(struct dw_spi *dws, bool raw);
285extern int dw_spi_add_host(struct device *dev, struct dw_spi *dws);
286extern void dw_spi_remove_host(struct dw_spi *dws);
287extern int dw_spi_suspend_host(struct dw_spi *dws);
288extern int dw_spi_resume_host(struct dw_spi *dws);
289
290#ifdef CONFIG_SPI_DW_DMA
291
292extern void dw_spi_dma_setup_mfld(struct dw_spi *dws);
293extern void dw_spi_dma_setup_generic(struct dw_spi *dws);
294
295#else
296
297static inline void dw_spi_dma_setup_mfld(struct dw_spi *dws) {}
298static inline void dw_spi_dma_setup_generic(struct dw_spi *dws) {}
299
300#endif /* !CONFIG_SPI_DW_DMA */
301
302#endif /* DW_SPI_HEADER_H */