1 // SPDX-License-Identifier: GPL-2.0
2 // Copyright (c) 2019 Nuvoton Technology corporation.
3
4 #include <linux/bits.h>
5 #include <linux/init.h>
6 #include <linux/kernel.h>
7 #include <linux/device.h>
8 #include <linux/module.h>
9 #include <linux/ioport.h>
10 #include <linux/clk.h>
11 #include <linux/platform_device.h>
12 #include <linux/io.h>
13 #include <linux/vmalloc.h>
14 #include <linux/regmap.h>
15 #include <linux/of_device.h>
16 #include <linux/spi/spi-mem.h>
17 #include <linux/mfd/syscon.h>
18
19 /* NPCM7xx GCR module */
20 #define NPCM7XX_INTCR3_OFFSET 0x9C
21 #define NPCM7XX_INTCR3_FIU_FIX BIT(6)
22
23 /* Flash Interface Unit (FIU) Registers */
24 #define NPCM_FIU_DRD_CFG 0x00
25 #define NPCM_FIU_DWR_CFG 0x04
26 #define NPCM_FIU_UMA_CFG 0x08
27 #define NPCM_FIU_UMA_CTS 0x0C
28 #define NPCM_FIU_UMA_CMD 0x10
29 #define NPCM_FIU_UMA_ADDR 0x14
30 #define NPCM_FIU_PRT_CFG 0x18
31 #define NPCM_FIU_UMA_DW0 0x20
32 #define NPCM_FIU_UMA_DW1 0x24
33 #define NPCM_FIU_UMA_DW2 0x28
34 #define NPCM_FIU_UMA_DW3 0x2C
35 #define NPCM_FIU_UMA_DR0 0x30
36 #define NPCM_FIU_UMA_DR1 0x34
37 #define NPCM_FIU_UMA_DR2 0x38
38 #define NPCM_FIU_UMA_DR3 0x3C
39 #define NPCM_FIU_MAX_REG_LIMIT 0x80
40
41 /* FIU Direct Read Configuration Register */
42 #define NPCM_FIU_DRD_CFG_LCK BIT(31)
43 #define NPCM_FIU_DRD_CFG_R_BURST GENMASK(25, 24)
44 #define NPCM_FIU_DRD_CFG_ADDSIZ GENMASK(17, 16)
45 #define NPCM_FIU_DRD_CFG_DBW GENMASK(13, 12)
46 #define NPCM_FIU_DRD_CFG_ACCTYPE GENMASK(9, 8)
47 #define NPCM_FIU_DRD_CFG_RDCMD GENMASK(7, 0)
48 #define NPCM_FIU_DRD_ADDSIZ_SHIFT 16
49 #define NPCM_FIU_DRD_DBW_SHIFT 12
50 #define NPCM_FIU_DRD_ACCTYPE_SHIFT 8
51
52 /* FIU Direct Write Configuration Register */
53 #define NPCM_FIU_DWR_CFG_LCK BIT(31)
54 #define NPCM_FIU_DWR_CFG_W_BURST GENMASK(25, 24)
55 #define NPCM_FIU_DWR_CFG_ADDSIZ GENMASK(17, 16)
56 #define NPCM_FIU_DWR_CFG_ABPCK GENMASK(11, 10)
57 #define NPCM_FIU_DWR_CFG_DBPCK GENMASK(9, 8)
58 #define NPCM_FIU_DWR_CFG_WRCMD GENMASK(7, 0)
59 #define NPCM_FIU_DWR_ADDSIZ_SHIFT 16
60 #define NPCM_FIU_DWR_ABPCK_SHIFT 10
61 #define NPCM_FIU_DWR_DBPCK_SHIFT 8
62
63 /* FIU UMA Configuration Register */
64 #define NPCM_FIU_UMA_CFG_LCK BIT(31)
65 #define NPCM_FIU_UMA_CFG_CMMLCK BIT(30)
66 #define NPCM_FIU_UMA_CFG_RDATSIZ GENMASK(28, 24)
67 #define NPCM_FIU_UMA_CFG_DBSIZ GENMASK(23, 21)
68 #define NPCM_FIU_UMA_CFG_WDATSIZ GENMASK(20, 16)
69 #define NPCM_FIU_UMA_CFG_ADDSIZ GENMASK(13, 11)
70 #define NPCM_FIU_UMA_CFG_CMDSIZ BIT(10)
71 #define NPCM_FIU_UMA_CFG_RDBPCK GENMASK(9, 8)
72 #define NPCM_FIU_UMA_CFG_DBPCK GENMASK(7, 6)
73 #define NPCM_FIU_UMA_CFG_WDBPCK GENMASK(5, 4)
74 #define NPCM_FIU_UMA_CFG_ADBPCK GENMASK(3, 2)
75 #define NPCM_FIU_UMA_CFG_CMBPCK GENMASK(1, 0)
76 #define NPCM_FIU_UMA_CFG_ADBPCK_SHIFT 2
77 #define NPCM_FIU_UMA_CFG_WDBPCK_SHIFT 4
78 #define NPCM_FIU_UMA_CFG_DBPCK_SHIFT 6
79 #define NPCM_FIU_UMA_CFG_RDBPCK_SHIFT 8
80 #define NPCM_FIU_UMA_CFG_ADDSIZ_SHIFT 11
81 #define NPCM_FIU_UMA_CFG_WDATSIZ_SHIFT 16
82 #define NPCM_FIU_UMA_CFG_DBSIZ_SHIFT 21
83 #define NPCM_FIU_UMA_CFG_RDATSIZ_SHIFT 24
84
85 /* FIU UMA Control and Status Register */
86 #define NPCM_FIU_UMA_CTS_RDYIE BIT(25)
87 #define NPCM_FIU_UMA_CTS_RDYST BIT(24)
88 #define NPCM_FIU_UMA_CTS_SW_CS BIT(16)
89 #define NPCM_FIU_UMA_CTS_DEV_NUM GENMASK(9, 8)
90 #define NPCM_FIU_UMA_CTS_EXEC_DONE BIT(0)
91 #define NPCM_FIU_UMA_CTS_DEV_NUM_SHIFT 8
92
93 /* FIU UMA Command Register */
94 #define NPCM_FIU_UMA_CMD_DUM3 GENMASK(31, 24)
95 #define NPCM_FIU_UMA_CMD_DUM2 GENMASK(23, 16)
96 #define NPCM_FIU_UMA_CMD_DUM1 GENMASK(15, 8)
97 #define NPCM_FIU_UMA_CMD_CMD GENMASK(7, 0)
98
99 /* FIU UMA Address Register */
100 #define NPCM_FIU_UMA_ADDR_UMA_ADDR GENMASK(31, 0)
101 #define NPCM_FIU_UMA_ADDR_AB3 GENMASK(31, 24)
102 #define NPCM_FIU_UMA_ADDR_AB2 GENMASK(23, 16)
103 #define NPCM_FIU_UMA_ADDR_AB1 GENMASK(15, 8)
104 #define NPCM_FIU_UMA_ADDR_AB0 GENMASK(7, 0)
105
106 /* FIU UMA Write Data Bytes 0-3 Register */
107 #define NPCM_FIU_UMA_DW0_WB3 GENMASK(31, 24)
108 #define NPCM_FIU_UMA_DW0_WB2 GENMASK(23, 16)
109 #define NPCM_FIU_UMA_DW0_WB1 GENMASK(15, 8)
110 #define NPCM_FIU_UMA_DW0_WB0 GENMASK(7, 0)
111
112 /* FIU UMA Write Data Bytes 4-7 Register */
113 #define NPCM_FIU_UMA_DW1_WB7 GENMASK(31, 24)
114 #define NPCM_FIU_UMA_DW1_WB6 GENMASK(23, 16)
115 #define NPCM_FIU_UMA_DW1_WB5 GENMASK(15, 8)
116 #define NPCM_FIU_UMA_DW1_WB4 GENMASK(7, 0)
117
118 /* FIU UMA Write Data Bytes 8-11 Register */
119 #define NPCM_FIU_UMA_DW2_WB11 GENMASK(31, 24)
120 #define NPCM_FIU_UMA_DW2_WB10 GENMASK(23, 16)
121 #define NPCM_FIU_UMA_DW2_WB9 GENMASK(15, 8)
122 #define NPCM_FIU_UMA_DW2_WB8 GENMASK(7, 0)
123
124 /* FIU UMA Write Data Bytes 12-15 Register */
125 #define NPCM_FIU_UMA_DW3_WB15 GENMASK(31, 24)
126 #define NPCM_FIU_UMA_DW3_WB14 GENMASK(23, 16)
127 #define NPCM_FIU_UMA_DW3_WB13 GENMASK(15, 8)
128 #define NPCM_FIU_UMA_DW3_WB12 GENMASK(7, 0)
129
130 /* FIU UMA Read Data Bytes 0-3 Register */
131 #define NPCM_FIU_UMA_DR0_RB3 GENMASK(31, 24)
132 #define NPCM_FIU_UMA_DR0_RB2 GENMASK(23, 16)
133 #define NPCM_FIU_UMA_DR0_RB1 GENMASK(15, 8)
134 #define NPCM_FIU_UMA_DR0_RB0 GENMASK(7, 0)
135
136 /* FIU UMA Read Data Bytes 4-7 Register */
137 #define NPCM_FIU_UMA_DR1_RB15 GENMASK(31, 24)
138 #define NPCM_FIU_UMA_DR1_RB14 GENMASK(23, 16)
139 #define NPCM_FIU_UMA_DR1_RB13 GENMASK(15, 8)
140 #define NPCM_FIU_UMA_DR1_RB12 GENMASK(7, 0)
141
142 /* FIU UMA Read Data Bytes 8-11 Register */
143 #define NPCM_FIU_UMA_DR2_RB15 GENMASK(31, 24)
144 #define NPCM_FIU_UMA_DR2_RB14 GENMASK(23, 16)
145 #define NPCM_FIU_UMA_DR2_RB13 GENMASK(15, 8)
146 #define NPCM_FIU_UMA_DR2_RB12 GENMASK(7, 0)
147
148 /* FIU UMA Read Data Bytes 12-15 Register */
149 #define NPCM_FIU_UMA_DR3_RB15 GENMASK(31, 24)
150 #define NPCM_FIU_UMA_DR3_RB14 GENMASK(23, 16)
151 #define NPCM_FIU_UMA_DR3_RB13 GENMASK(15, 8)
152 #define NPCM_FIU_UMA_DR3_RB12 GENMASK(7, 0)
153
154 /* FIU Read Mode */
155 enum {
156 DRD_SINGLE_WIRE_MODE = 0,
157 DRD_DUAL_IO_MODE = 1,
158 DRD_QUAD_IO_MODE = 2,
159 DRD_SPI_X_MODE = 3,
160 };
161
162 enum {
163 DWR_ABPCK_BIT_PER_CLK = 0,
164 DWR_ABPCK_2_BIT_PER_CLK = 1,
165 DWR_ABPCK_4_BIT_PER_CLK = 2,
166 };
167
168 enum {
169 DWR_DBPCK_BIT_PER_CLK = 0,
170 DWR_DBPCK_2_BIT_PER_CLK = 1,
171 DWR_DBPCK_4_BIT_PER_CLK = 2,
172 };
173
174 #define NPCM_FIU_DRD_16_BYTE_BURST 0x3000000
175 #define NPCM_FIU_DWR_16_BYTE_BURST 0x3000000
176
177 #define MAP_SIZE_128MB 0x8000000
178 #define MAP_SIZE_16MB 0x1000000
179 #define MAP_SIZE_8MB 0x800000
180
181 #define FIU_DRD_MAX_DUMMY_NUMBER 3
182 #define NPCM_MAX_CHIP_NUM 4
183 #define CHUNK_SIZE 16
184 #define UMA_MICRO_SEC_TIMEOUT 150
185
186 enum {
187 FIU0 = 0,
188 FIU3,
189 FIUX,
190 };
191
192 struct npcm_fiu_info {
193 char *name;
194 u32 fiu_id;
195 u32 max_map_size;
196 u32 max_cs;
197 };
198
199 struct fiu_data {
200 const struct npcm_fiu_info *npcm_fiu_data_info;
201 int fiu_max;
202 };
203
204 static const struct npcm_fiu_info npxm7xx_fiu_info[] = {
205 {.name = "FIU0", .fiu_id = FIU0,
206 .max_map_size = MAP_SIZE_128MB, .max_cs = 2},
207 {.name = "FIU3", .fiu_id = FIU3,
208 .max_map_size = MAP_SIZE_128MB, .max_cs = 4},
209 {.name = "FIUX", .fiu_id = FIUX,
210 .max_map_size = MAP_SIZE_16MB, .max_cs = 2} };
211
212 static const struct fiu_data npxm7xx_fiu_data = {
213 .npcm_fiu_data_info = npxm7xx_fiu_info,
214 .fiu_max = 3,
215 };
216
217 struct npcm_fiu_spi;
218
219 struct npcm_fiu_chip {
220 void __iomem *flash_region_mapped_ptr;
221 struct npcm_fiu_spi *fiu;
222 unsigned long clkrate;
223 u32 chipselect;
224 };
225
226 struct npcm_fiu_spi {
227 struct npcm_fiu_chip chip[NPCM_MAX_CHIP_NUM];
228 const struct npcm_fiu_info *info;
229 struct spi_mem_op drd_op;
230 struct resource *res_mem;
231 struct regmap *regmap;
232 unsigned long clkrate;
233 struct device *dev;
234 struct clk *clk;
235 bool spix_mode;
236 };
237
238 static const struct regmap_config npcm_mtd_regmap_config = {
239 .reg_bits = 32,
240 .val_bits = 32,
241 .reg_stride = 4,
242 .max_register = NPCM_FIU_MAX_REG_LIMIT,
243 };
244
npcm_fiu_set_drd(struct npcm_fiu_spi * fiu,const struct spi_mem_op * op)245 static void npcm_fiu_set_drd(struct npcm_fiu_spi *fiu,
246 const struct spi_mem_op *op)
247 {
248 regmap_update_bits(fiu->regmap, NPCM_FIU_DRD_CFG,
249 NPCM_FIU_DRD_CFG_ACCTYPE,
250 ilog2(op->addr.buswidth) <<
251 NPCM_FIU_DRD_ACCTYPE_SHIFT);
252 fiu->drd_op.addr.buswidth = op->addr.buswidth;
253 regmap_update_bits(fiu->regmap, NPCM_FIU_DRD_CFG,
254 NPCM_FIU_DRD_CFG_DBW,
255 ((op->dummy.nbytes * ilog2(op->addr.buswidth)) / BITS_PER_BYTE)
256 << NPCM_FIU_DRD_DBW_SHIFT);
257 fiu->drd_op.dummy.nbytes = op->dummy.nbytes;
258 regmap_update_bits(fiu->regmap, NPCM_FIU_DRD_CFG,
259 NPCM_FIU_DRD_CFG_RDCMD, op->cmd.opcode);
260 fiu->drd_op.cmd.opcode = op->cmd.opcode;
261 regmap_update_bits(fiu->regmap, NPCM_FIU_DRD_CFG,
262 NPCM_FIU_DRD_CFG_ADDSIZ,
263 (op->addr.nbytes - 3) << NPCM_FIU_DRD_ADDSIZ_SHIFT);
264 fiu->drd_op.addr.nbytes = op->addr.nbytes;
265 }
266
npcm_fiu_direct_read(struct spi_mem_dirmap_desc * desc,u64 offs,size_t len,void * buf)267 static ssize_t npcm_fiu_direct_read(struct spi_mem_dirmap_desc *desc,
268 u64 offs, size_t len, void *buf)
269 {
270 struct npcm_fiu_spi *fiu =
271 spi_controller_get_devdata(desc->mem->spi->master);
272 struct npcm_fiu_chip *chip = &fiu->chip[desc->mem->spi->chip_select];
273 void __iomem *src = (void __iomem *)(chip->flash_region_mapped_ptr +
274 offs);
275 u8 *buf_rx = buf;
276 u32 i;
277
278 if (fiu->spix_mode) {
279 for (i = 0 ; i < len ; i++)
280 *(buf_rx + i) = ioread8(src + i);
281 } else {
282 if (desc->info.op_tmpl.addr.buswidth != fiu->drd_op.addr.buswidth ||
283 desc->info.op_tmpl.dummy.nbytes != fiu->drd_op.dummy.nbytes ||
284 desc->info.op_tmpl.cmd.opcode != fiu->drd_op.cmd.opcode ||
285 desc->info.op_tmpl.addr.nbytes != fiu->drd_op.addr.nbytes)
286 npcm_fiu_set_drd(fiu, &desc->info.op_tmpl);
287
288 memcpy_fromio(buf_rx, src, len);
289 }
290
291 return len;
292 }
293
npcm_fiu_direct_write(struct spi_mem_dirmap_desc * desc,u64 offs,size_t len,const void * buf)294 static ssize_t npcm_fiu_direct_write(struct spi_mem_dirmap_desc *desc,
295 u64 offs, size_t len, const void *buf)
296 {
297 struct npcm_fiu_spi *fiu =
298 spi_controller_get_devdata(desc->mem->spi->master);
299 struct npcm_fiu_chip *chip = &fiu->chip[desc->mem->spi->chip_select];
300 void __iomem *dst = (void __iomem *)(chip->flash_region_mapped_ptr +
301 offs);
302 const u8 *buf_tx = buf;
303 u32 i;
304
305 if (fiu->spix_mode)
306 for (i = 0 ; i < len ; i++)
307 iowrite8(*(buf_tx + i), dst + i);
308 else
309 memcpy_toio(dst, buf_tx, len);
310
311 return len;
312 }
313
npcm_fiu_uma_read(struct spi_mem * mem,const struct spi_mem_op * op,u32 addr,bool is_address_size,u8 * data,u32 data_size)314 static int npcm_fiu_uma_read(struct spi_mem *mem,
315 const struct spi_mem_op *op, u32 addr,
316 bool is_address_size, u8 *data, u32 data_size)
317 {
318 struct npcm_fiu_spi *fiu =
319 spi_controller_get_devdata(mem->spi->master);
320 u32 uma_cfg = BIT(10);
321 u32 data_reg[4];
322 int ret;
323 u32 val;
324 u32 i;
325
326 regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CTS,
327 NPCM_FIU_UMA_CTS_DEV_NUM,
328 (mem->spi->chip_select <<
329 NPCM_FIU_UMA_CTS_DEV_NUM_SHIFT));
330 regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CMD,
331 NPCM_FIU_UMA_CMD_CMD, op->cmd.opcode);
332
333 if (is_address_size) {
334 uma_cfg |= ilog2(op->cmd.buswidth);
335 uma_cfg |= ilog2(op->addr.buswidth)
336 << NPCM_FIU_UMA_CFG_ADBPCK_SHIFT;
337 uma_cfg |= ilog2(op->dummy.buswidth)
338 << NPCM_FIU_UMA_CFG_DBPCK_SHIFT;
339 uma_cfg |= ilog2(op->data.buswidth)
340 << NPCM_FIU_UMA_CFG_RDBPCK_SHIFT;
341 uma_cfg |= op->dummy.nbytes << NPCM_FIU_UMA_CFG_DBSIZ_SHIFT;
342 uma_cfg |= op->addr.nbytes << NPCM_FIU_UMA_CFG_ADDSIZ_SHIFT;
343 regmap_write(fiu->regmap, NPCM_FIU_UMA_ADDR, addr);
344 } else {
345 regmap_write(fiu->regmap, NPCM_FIU_UMA_ADDR, 0x0);
346 }
347
348 uma_cfg |= data_size << NPCM_FIU_UMA_CFG_RDATSIZ_SHIFT;
349 regmap_write(fiu->regmap, NPCM_FIU_UMA_CFG, uma_cfg);
350 regmap_write_bits(fiu->regmap, NPCM_FIU_UMA_CTS,
351 NPCM_FIU_UMA_CTS_EXEC_DONE,
352 NPCM_FIU_UMA_CTS_EXEC_DONE);
353 ret = regmap_read_poll_timeout(fiu->regmap, NPCM_FIU_UMA_CTS, val,
354 (!(val & NPCM_FIU_UMA_CTS_EXEC_DONE)), 0,
355 UMA_MICRO_SEC_TIMEOUT);
356 if (ret)
357 return ret;
358
359 if (data_size) {
360 for (i = 0; i < DIV_ROUND_UP(data_size, 4); i++)
361 regmap_read(fiu->regmap, NPCM_FIU_UMA_DR0 + (i * 4),
362 &data_reg[i]);
363 memcpy(data, data_reg, data_size);
364 }
365
366 return 0;
367 }
368
npcm_fiu_uma_write(struct spi_mem * mem,const struct spi_mem_op * op,u8 cmd,bool is_address_size,u8 * data,u32 data_size)369 static int npcm_fiu_uma_write(struct spi_mem *mem,
370 const struct spi_mem_op *op, u8 cmd,
371 bool is_address_size, u8 *data, u32 data_size)
372 {
373 struct npcm_fiu_spi *fiu =
374 spi_controller_get_devdata(mem->spi->master);
375 u32 uma_cfg = BIT(10);
376 u32 data_reg[4] = {0};
377 u32 val;
378 u32 i;
379
380 regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CTS,
381 NPCM_FIU_UMA_CTS_DEV_NUM,
382 (mem->spi->chip_select <<
383 NPCM_FIU_UMA_CTS_DEV_NUM_SHIFT));
384
385 regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CMD,
386 NPCM_FIU_UMA_CMD_CMD, cmd);
387
388 if (data_size) {
389 memcpy(data_reg, data, data_size);
390 for (i = 0; i < DIV_ROUND_UP(data_size, 4); i++)
391 regmap_write(fiu->regmap, NPCM_FIU_UMA_DW0 + (i * 4),
392 data_reg[i]);
393 }
394
395 if (is_address_size) {
396 uma_cfg |= ilog2(op->cmd.buswidth);
397 uma_cfg |= ilog2(op->addr.buswidth) <<
398 NPCM_FIU_UMA_CFG_ADBPCK_SHIFT;
399 uma_cfg |= ilog2(op->data.buswidth) <<
400 NPCM_FIU_UMA_CFG_WDBPCK_SHIFT;
401 uma_cfg |= op->addr.nbytes << NPCM_FIU_UMA_CFG_ADDSIZ_SHIFT;
402 regmap_write(fiu->regmap, NPCM_FIU_UMA_ADDR, op->addr.val);
403 } else {
404 regmap_write(fiu->regmap, NPCM_FIU_UMA_ADDR, 0x0);
405 }
406
407 uma_cfg |= (data_size << NPCM_FIU_UMA_CFG_WDATSIZ_SHIFT);
408 regmap_write(fiu->regmap, NPCM_FIU_UMA_CFG, uma_cfg);
409
410 regmap_write_bits(fiu->regmap, NPCM_FIU_UMA_CTS,
411 NPCM_FIU_UMA_CTS_EXEC_DONE,
412 NPCM_FIU_UMA_CTS_EXEC_DONE);
413
414 return regmap_read_poll_timeout(fiu->regmap, NPCM_FIU_UMA_CTS, val,
415 (!(val & NPCM_FIU_UMA_CTS_EXEC_DONE)), 0,
416 UMA_MICRO_SEC_TIMEOUT);
417 }
418
npcm_fiu_manualwrite(struct spi_mem * mem,const struct spi_mem_op * op)419 static int npcm_fiu_manualwrite(struct spi_mem *mem,
420 const struct spi_mem_op *op)
421 {
422 struct npcm_fiu_spi *fiu =
423 spi_controller_get_devdata(mem->spi->master);
424 u8 *data = (u8 *)op->data.buf.out;
425 u32 num_data_chunks;
426 u32 remain_data;
427 u32 idx = 0;
428 int ret;
429
430 num_data_chunks = op->data.nbytes / CHUNK_SIZE;
431 remain_data = op->data.nbytes % CHUNK_SIZE;
432
433 regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CTS,
434 NPCM_FIU_UMA_CTS_DEV_NUM,
435 (mem->spi->chip_select <<
436 NPCM_FIU_UMA_CTS_DEV_NUM_SHIFT));
437 regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CTS,
438 NPCM_FIU_UMA_CTS_SW_CS, 0);
439
440 ret = npcm_fiu_uma_write(mem, op, op->cmd.opcode, true, NULL, 0);
441 if (ret)
442 return ret;
443
444 /* Starting the data writing loop in multiples of 8 */
445 for (idx = 0; idx < num_data_chunks; ++idx) {
446 ret = npcm_fiu_uma_write(mem, op, data[0], false,
447 &data[1], CHUNK_SIZE - 1);
448 if (ret)
449 return ret;
450
451 data += CHUNK_SIZE;
452 }
453
454 /* Handling chunk remains */
455 if (remain_data > 0) {
456 ret = npcm_fiu_uma_write(mem, op, data[0], false,
457 &data[1], remain_data - 1);
458 if (ret)
459 return ret;
460 }
461
462 regmap_update_bits(fiu->regmap, NPCM_FIU_UMA_CTS,
463 NPCM_FIU_UMA_CTS_SW_CS, NPCM_FIU_UMA_CTS_SW_CS);
464
465 return 0;
466 }
467
npcm_fiu_read(struct spi_mem * mem,const struct spi_mem_op * op)468 static int npcm_fiu_read(struct spi_mem *mem, const struct spi_mem_op *op)
469 {
470 u8 *data = op->data.buf.in;
471 int i, readlen, currlen;
472 u8 *buf_ptr;
473 u32 addr;
474 int ret;
475
476 i = 0;
477 currlen = op->data.nbytes;
478
479 do {
480 addr = ((u32)op->addr.val + i);
481 if (currlen < 16)
482 readlen = currlen;
483 else
484 readlen = 16;
485
486 buf_ptr = data + i;
487 ret = npcm_fiu_uma_read(mem, op, addr, true, buf_ptr,
488 readlen);
489 if (ret)
490 return ret;
491
492 i += readlen;
493 currlen -= 16;
494 } while (currlen > 0);
495
496 return 0;
497 }
498
npcm_fiux_set_direct_wr(struct npcm_fiu_spi * fiu)499 static void npcm_fiux_set_direct_wr(struct npcm_fiu_spi *fiu)
500 {
501 regmap_write(fiu->regmap, NPCM_FIU_DWR_CFG,
502 NPCM_FIU_DWR_16_BYTE_BURST);
503 regmap_update_bits(fiu->regmap, NPCM_FIU_DWR_CFG,
504 NPCM_FIU_DWR_CFG_ABPCK,
505 DWR_ABPCK_4_BIT_PER_CLK << NPCM_FIU_DWR_ABPCK_SHIFT);
506 regmap_update_bits(fiu->regmap, NPCM_FIU_DWR_CFG,
507 NPCM_FIU_DWR_CFG_DBPCK,
508 DWR_DBPCK_4_BIT_PER_CLK << NPCM_FIU_DWR_DBPCK_SHIFT);
509 }
510
npcm_fiux_set_direct_rd(struct npcm_fiu_spi * fiu)511 static void npcm_fiux_set_direct_rd(struct npcm_fiu_spi *fiu)
512 {
513 u32 rx_dummy = 0;
514
515 regmap_write(fiu->regmap, NPCM_FIU_DRD_CFG,
516 NPCM_FIU_DRD_16_BYTE_BURST);
517 regmap_update_bits(fiu->regmap, NPCM_FIU_DRD_CFG,
518 NPCM_FIU_DRD_CFG_ACCTYPE,
519 DRD_SPI_X_MODE << NPCM_FIU_DRD_ACCTYPE_SHIFT);
520 regmap_update_bits(fiu->regmap, NPCM_FIU_DRD_CFG,
521 NPCM_FIU_DRD_CFG_DBW,
522 rx_dummy << NPCM_FIU_DRD_DBW_SHIFT);
523 }
524
npcm_fiu_exec_op(struct spi_mem * mem,const struct spi_mem_op * op)525 static int npcm_fiu_exec_op(struct spi_mem *mem, const struct spi_mem_op *op)
526 {
527 struct npcm_fiu_spi *fiu =
528 spi_controller_get_devdata(mem->spi->master);
529 struct npcm_fiu_chip *chip = &fiu->chip[mem->spi->chip_select];
530 int ret = 0;
531 u8 *buf;
532
533 dev_dbg(fiu->dev, "cmd:%#x mode:%d.%d.%d.%d addr:%#llx len:%#x\n",
534 op->cmd.opcode, op->cmd.buswidth, op->addr.buswidth,
535 op->dummy.buswidth, op->data.buswidth, op->addr.val,
536 op->data.nbytes);
537
538 if (fiu->spix_mode || op->addr.nbytes > 4)
539 return -ENOTSUPP;
540
541 if (fiu->clkrate != chip->clkrate) {
542 ret = clk_set_rate(fiu->clk, chip->clkrate);
543 if (ret < 0)
544 dev_warn(fiu->dev, "Failed setting %lu frequency, stay at %lu frequency\n",
545 chip->clkrate, fiu->clkrate);
546 else
547 fiu->clkrate = chip->clkrate;
548 }
549
550 if (op->data.dir == SPI_MEM_DATA_IN) {
551 if (!op->addr.nbytes) {
552 buf = op->data.buf.in;
553 ret = npcm_fiu_uma_read(mem, op, op->addr.val, false,
554 buf, op->data.nbytes);
555 } else {
556 ret = npcm_fiu_read(mem, op);
557 }
558 } else {
559 if (!op->addr.nbytes && !op->data.nbytes)
560 ret = npcm_fiu_uma_write(mem, op, op->cmd.opcode, false,
561 NULL, 0);
562 if (op->addr.nbytes && !op->data.nbytes) {
563 int i;
564 u8 buf_addr[4];
565 u32 addr = op->addr.val;
566
567 for (i = op->addr.nbytes - 1; i >= 0; i--) {
568 buf_addr[i] = addr & 0xff;
569 addr >>= 8;
570 }
571 ret = npcm_fiu_uma_write(mem, op, op->cmd.opcode, false,
572 buf_addr, op->addr.nbytes);
573 }
574 if (!op->addr.nbytes && op->data.nbytes)
575 ret = npcm_fiu_uma_write(mem, op, op->cmd.opcode, false,
576 (u8 *)op->data.buf.out,
577 op->data.nbytes);
578 if (op->addr.nbytes && op->data.nbytes)
579 ret = npcm_fiu_manualwrite(mem, op);
580 }
581
582 return ret;
583 }
584
npcm_fiu_dirmap_create(struct spi_mem_dirmap_desc * desc)585 static int npcm_fiu_dirmap_create(struct spi_mem_dirmap_desc *desc)
586 {
587 struct npcm_fiu_spi *fiu =
588 spi_controller_get_devdata(desc->mem->spi->master);
589 struct npcm_fiu_chip *chip = &fiu->chip[desc->mem->spi->chip_select];
590 struct regmap *gcr_regmap;
591
592 if (!fiu->res_mem) {
593 dev_warn(fiu->dev, "Reserved memory not defined, direct read disabled\n");
594 desc->nodirmap = true;
595 return 0;
596 }
597
598 if (!fiu->spix_mode &&
599 desc->info.op_tmpl.data.dir == SPI_MEM_DATA_OUT) {
600 desc->nodirmap = true;
601 return 0;
602 }
603
604 if (!chip->flash_region_mapped_ptr) {
605 chip->flash_region_mapped_ptr =
606 devm_ioremap(fiu->dev, (fiu->res_mem->start +
607 (fiu->info->max_map_size *
608 desc->mem->spi->chip_select)),
609 (u32)desc->info.length);
610 if (!chip->flash_region_mapped_ptr) {
611 dev_warn(fiu->dev, "Error mapping memory region, direct read disabled\n");
612 desc->nodirmap = true;
613 return 0;
614 }
615 }
616
617 if (of_device_is_compatible(fiu->dev->of_node, "nuvoton,npcm750-fiu")) {
618 gcr_regmap =
619 syscon_regmap_lookup_by_compatible("nuvoton,npcm750-gcr");
620 if (IS_ERR(gcr_regmap)) {
621 dev_warn(fiu->dev, "Didn't find nuvoton,npcm750-gcr, direct read disabled\n");
622 desc->nodirmap = true;
623 return 0;
624 }
625 regmap_update_bits(gcr_regmap, NPCM7XX_INTCR3_OFFSET,
626 NPCM7XX_INTCR3_FIU_FIX,
627 NPCM7XX_INTCR3_FIU_FIX);
628 }
629
630 if (desc->info.op_tmpl.data.dir == SPI_MEM_DATA_IN) {
631 if (!fiu->spix_mode)
632 npcm_fiu_set_drd(fiu, &desc->info.op_tmpl);
633 else
634 npcm_fiux_set_direct_rd(fiu);
635
636 } else {
637 npcm_fiux_set_direct_wr(fiu);
638 }
639
640 return 0;
641 }
642
npcm_fiu_setup(struct spi_device * spi)643 static int npcm_fiu_setup(struct spi_device *spi)
644 {
645 struct spi_controller *ctrl = spi->master;
646 struct npcm_fiu_spi *fiu = spi_controller_get_devdata(ctrl);
647 struct npcm_fiu_chip *chip;
648
649 chip = &fiu->chip[spi->chip_select];
650 chip->fiu = fiu;
651 chip->chipselect = spi->chip_select;
652 chip->clkrate = spi->max_speed_hz;
653
654 fiu->clkrate = clk_get_rate(fiu->clk);
655
656 return 0;
657 }
658
659 static const struct spi_controller_mem_ops npcm_fiu_mem_ops = {
660 .exec_op = npcm_fiu_exec_op,
661 .dirmap_create = npcm_fiu_dirmap_create,
662 .dirmap_read = npcm_fiu_direct_read,
663 .dirmap_write = npcm_fiu_direct_write,
664 };
665
666 static const struct of_device_id npcm_fiu_dt_ids[] = {
667 { .compatible = "nuvoton,npcm750-fiu", .data = &npxm7xx_fiu_data },
668 { /* sentinel */ }
669 };
670
npcm_fiu_probe(struct platform_device * pdev)671 static int npcm_fiu_probe(struct platform_device *pdev)
672 {
673 const struct fiu_data *fiu_data_match;
674 const struct of_device_id *match;
675 struct device *dev = &pdev->dev;
676 struct spi_controller *ctrl;
677 struct npcm_fiu_spi *fiu;
678 void __iomem *regbase;
679 struct resource *res;
680 int id, ret;
681
682 ctrl = devm_spi_alloc_master(dev, sizeof(*fiu));
683 if (!ctrl)
684 return -ENOMEM;
685
686 fiu = spi_controller_get_devdata(ctrl);
687
688 match = of_match_device(npcm_fiu_dt_ids, dev);
689 if (!match || !match->data) {
690 dev_err(dev, "No compatible OF match\n");
691 return -ENODEV;
692 }
693
694 fiu_data_match = match->data;
695 id = of_alias_get_id(dev->of_node, "fiu");
696 if (id < 0 || id >= fiu_data_match->fiu_max) {
697 dev_err(dev, "Invalid platform device id: %d\n", id);
698 return -EINVAL;
699 }
700
701 fiu->info = &fiu_data_match->npcm_fiu_data_info[id];
702
703 platform_set_drvdata(pdev, fiu);
704 fiu->dev = dev;
705
706 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "control");
707 regbase = devm_ioremap_resource(dev, res);
708 if (IS_ERR(regbase))
709 return PTR_ERR(regbase);
710
711 fiu->regmap = devm_regmap_init_mmio(dev, regbase,
712 &npcm_mtd_regmap_config);
713 if (IS_ERR(fiu->regmap)) {
714 dev_err(dev, "Failed to create regmap\n");
715 return PTR_ERR(fiu->regmap);
716 }
717
718 fiu->res_mem = platform_get_resource_byname(pdev, IORESOURCE_MEM,
719 "memory");
720 fiu->clk = devm_clk_get(dev, NULL);
721 if (IS_ERR(fiu->clk))
722 return PTR_ERR(fiu->clk);
723
724 fiu->spix_mode = of_property_read_bool(dev->of_node,
725 "nuvoton,spix-mode");
726
727 platform_set_drvdata(pdev, fiu);
728 clk_prepare_enable(fiu->clk);
729
730 ctrl->mode_bits = SPI_RX_DUAL | SPI_RX_QUAD
731 | SPI_TX_DUAL | SPI_TX_QUAD;
732 ctrl->setup = npcm_fiu_setup;
733 ctrl->bus_num = -1;
734 ctrl->mem_ops = &npcm_fiu_mem_ops;
735 ctrl->num_chipselect = fiu->info->max_cs;
736 ctrl->dev.of_node = dev->of_node;
737
738 ret = devm_spi_register_master(dev, ctrl);
739 if (ret)
740 clk_disable_unprepare(fiu->clk);
741
742 return ret;
743 }
744
npcm_fiu_remove(struct platform_device * pdev)745 static int npcm_fiu_remove(struct platform_device *pdev)
746 {
747 struct npcm_fiu_spi *fiu = platform_get_drvdata(pdev);
748
749 clk_disable_unprepare(fiu->clk);
750 return 0;
751 }
752
753 MODULE_DEVICE_TABLE(of, npcm_fiu_dt_ids);
754
755 static struct platform_driver npcm_fiu_driver = {
756 .driver = {
757 .name = "NPCM-FIU",
758 .bus = &platform_bus_type,
759 .of_match_table = npcm_fiu_dt_ids,
760 },
761 .probe = npcm_fiu_probe,
762 .remove = npcm_fiu_remove,
763 };
764 module_platform_driver(npcm_fiu_driver);
765
766 MODULE_DESCRIPTION("Nuvoton FLASH Interface Unit SPI Controller Driver");
767 MODULE_AUTHOR("Tomer Maimon <tomer.maimon@nuvoton.com>");
768 MODULE_LICENSE("GPL v2");
769