]> Git Repo - linux.git/blob - drivers/mtd/spi-nor/controllers/nxp-spifi.c
net: wan: Add framer framework support
[linux.git] / drivers / mtd / spi-nor / controllers / nxp-spifi.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * SPI NOR driver for NXP SPI Flash Interface (SPIFI)
4  *
5  * Copyright (C) 2015 Joachim Eastwood <[email protected]>
6  *
7  * Based on Freescale QuadSPI driver:
8  * Copyright (C) 2013 Freescale Semiconductor, Inc.
9  */
10
11 #include <linux/clk.h>
12 #include <linux/err.h>
13 #include <linux/io.h>
14 #include <linux/iopoll.h>
15 #include <linux/module.h>
16 #include <linux/mtd/mtd.h>
17 #include <linux/mtd/partitions.h>
18 #include <linux/mtd/spi-nor.h>
19 #include <linux/of.h>
20 #include <linux/platform_device.h>
21 #include <linux/spi/spi.h>
22
23 /* NXP SPIFI registers, bits and macros */
24 #define SPIFI_CTRL                              0x000
25 #define  SPIFI_CTRL_TIMEOUT(timeout)            (timeout)
26 #define  SPIFI_CTRL_CSHIGH(cshigh)              ((cshigh) << 16)
27 #define  SPIFI_CTRL_MODE3                       BIT(23)
28 #define  SPIFI_CTRL_DUAL                        BIT(28)
29 #define  SPIFI_CTRL_FBCLK                       BIT(30)
30 #define SPIFI_CMD                               0x004
31 #define  SPIFI_CMD_DATALEN(dlen)                ((dlen) & 0x3fff)
32 #define  SPIFI_CMD_DOUT                         BIT(15)
33 #define  SPIFI_CMD_INTLEN(ilen)                 ((ilen) << 16)
34 #define  SPIFI_CMD_FIELDFORM(field)             ((field) << 19)
35 #define  SPIFI_CMD_FIELDFORM_ALL_SERIAL         SPIFI_CMD_FIELDFORM(0x0)
36 #define  SPIFI_CMD_FIELDFORM_QUAD_DUAL_DATA     SPIFI_CMD_FIELDFORM(0x1)
37 #define  SPIFI_CMD_FRAMEFORM(frame)             ((frame) << 21)
38 #define  SPIFI_CMD_FRAMEFORM_OPCODE_ONLY        SPIFI_CMD_FRAMEFORM(0x1)
39 #define  SPIFI_CMD_OPCODE(op)                   ((op) << 24)
40 #define SPIFI_ADDR                              0x008
41 #define SPIFI_IDATA                             0x00c
42 #define SPIFI_CLIMIT                            0x010
43 #define SPIFI_DATA                              0x014
44 #define SPIFI_MCMD                              0x018
45 #define SPIFI_STAT                              0x01c
46 #define  SPIFI_STAT_MCINIT                      BIT(0)
47 #define  SPIFI_STAT_CMD                         BIT(1)
48 #define  SPIFI_STAT_RESET                       BIT(4)
49
50 #define SPI_NOR_MAX_ID_LEN      6
51
52 struct nxp_spifi {
53         struct device *dev;
54         struct clk *clk_spifi;
55         struct clk *clk_reg;
56         void __iomem *io_base;
57         void __iomem *flash_base;
58         struct spi_nor nor;
59         bool memory_mode;
60         u32 mcmd;
61 };
62
63 static int nxp_spifi_wait_for_cmd(struct nxp_spifi *spifi)
64 {
65         u8 stat;
66         int ret;
67
68         ret = readb_poll_timeout(spifi->io_base + SPIFI_STAT, stat,
69                                  !(stat & SPIFI_STAT_CMD), 10, 30);
70         if (ret)
71                 dev_warn(spifi->dev, "command timed out\n");
72
73         return ret;
74 }
75
76 static int nxp_spifi_reset(struct nxp_spifi *spifi)
77 {
78         u8 stat;
79         int ret;
80
81         writel(SPIFI_STAT_RESET, spifi->io_base + SPIFI_STAT);
82         ret = readb_poll_timeout(spifi->io_base + SPIFI_STAT, stat,
83                                  !(stat & SPIFI_STAT_RESET), 10, 30);
84         if (ret)
85                 dev_warn(spifi->dev, "state reset timed out\n");
86
87         return ret;
88 }
89
90 static int nxp_spifi_set_memory_mode_off(struct nxp_spifi *spifi)
91 {
92         int ret;
93
94         if (!spifi->memory_mode)
95                 return 0;
96
97         ret = nxp_spifi_reset(spifi);
98         if (ret)
99                 dev_err(spifi->dev, "unable to enter command mode\n");
100         else
101                 spifi->memory_mode = false;
102
103         return ret;
104 }
105
106 static int nxp_spifi_set_memory_mode_on(struct nxp_spifi *spifi)
107 {
108         u8 stat;
109         int ret;
110
111         if (spifi->memory_mode)
112                 return 0;
113
114         writel(spifi->mcmd, spifi->io_base + SPIFI_MCMD);
115         ret = readb_poll_timeout(spifi->io_base + SPIFI_STAT, stat,
116                                  stat & SPIFI_STAT_MCINIT, 10, 30);
117         if (ret)
118                 dev_err(spifi->dev, "unable to enter memory mode\n");
119         else
120                 spifi->memory_mode = true;
121
122         return ret;
123 }
124
125 static int nxp_spifi_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
126                               size_t len)
127 {
128         struct nxp_spifi *spifi = nor->priv;
129         u32 cmd;
130         int ret;
131
132         ret = nxp_spifi_set_memory_mode_off(spifi);
133         if (ret)
134                 return ret;
135
136         cmd = SPIFI_CMD_DATALEN(len) |
137               SPIFI_CMD_OPCODE(opcode) |
138               SPIFI_CMD_FIELDFORM_ALL_SERIAL |
139               SPIFI_CMD_FRAMEFORM_OPCODE_ONLY;
140         writel(cmd, spifi->io_base + SPIFI_CMD);
141
142         while (len--)
143                 *buf++ = readb(spifi->io_base + SPIFI_DATA);
144
145         return nxp_spifi_wait_for_cmd(spifi);
146 }
147
148 static int nxp_spifi_write_reg(struct spi_nor *nor, u8 opcode, const u8 *buf,
149                                size_t len)
150 {
151         struct nxp_spifi *spifi = nor->priv;
152         u32 cmd;
153         int ret;
154
155         ret = nxp_spifi_set_memory_mode_off(spifi);
156         if (ret)
157                 return ret;
158
159         cmd = SPIFI_CMD_DOUT |
160               SPIFI_CMD_DATALEN(len) |
161               SPIFI_CMD_OPCODE(opcode) |
162               SPIFI_CMD_FIELDFORM_ALL_SERIAL |
163               SPIFI_CMD_FRAMEFORM_OPCODE_ONLY;
164         writel(cmd, spifi->io_base + SPIFI_CMD);
165
166         while (len--)
167                 writeb(*buf++, spifi->io_base + SPIFI_DATA);
168
169         return nxp_spifi_wait_for_cmd(spifi);
170 }
171
172 static ssize_t nxp_spifi_read(struct spi_nor *nor, loff_t from, size_t len,
173                               u_char *buf)
174 {
175         struct nxp_spifi *spifi = nor->priv;
176         int ret;
177
178         ret = nxp_spifi_set_memory_mode_on(spifi);
179         if (ret)
180                 return ret;
181
182         memcpy_fromio(buf, spifi->flash_base + from, len);
183
184         return len;
185 }
186
187 static ssize_t nxp_spifi_write(struct spi_nor *nor, loff_t to, size_t len,
188                                const u_char *buf)
189 {
190         struct nxp_spifi *spifi = nor->priv;
191         u32 cmd;
192         int ret;
193         size_t i;
194
195         ret = nxp_spifi_set_memory_mode_off(spifi);
196         if (ret)
197                 return ret;
198
199         writel(to, spifi->io_base + SPIFI_ADDR);
200
201         cmd = SPIFI_CMD_DOUT |
202               SPIFI_CMD_DATALEN(len) |
203               SPIFI_CMD_FIELDFORM_ALL_SERIAL |
204               SPIFI_CMD_OPCODE(nor->program_opcode) |
205               SPIFI_CMD_FRAMEFORM(spifi->nor.addr_nbytes + 1);
206         writel(cmd, spifi->io_base + SPIFI_CMD);
207
208         for (i = 0; i < len; i++)
209                 writeb(buf[i], spifi->io_base + SPIFI_DATA);
210
211         ret = nxp_spifi_wait_for_cmd(spifi);
212         if (ret)
213                 return ret;
214
215         return len;
216 }
217
218 static int nxp_spifi_erase(struct spi_nor *nor, loff_t offs)
219 {
220         struct nxp_spifi *spifi = nor->priv;
221         u32 cmd;
222         int ret;
223
224         ret = nxp_spifi_set_memory_mode_off(spifi);
225         if (ret)
226                 return ret;
227
228         writel(offs, spifi->io_base + SPIFI_ADDR);
229
230         cmd = SPIFI_CMD_FIELDFORM_ALL_SERIAL |
231               SPIFI_CMD_OPCODE(nor->erase_opcode) |
232               SPIFI_CMD_FRAMEFORM(spifi->nor.addr_nbytes + 1);
233         writel(cmd, spifi->io_base + SPIFI_CMD);
234
235         return nxp_spifi_wait_for_cmd(spifi);
236 }
237
238 static int nxp_spifi_setup_memory_cmd(struct nxp_spifi *spifi)
239 {
240         switch (spifi->nor.read_proto) {
241         case SNOR_PROTO_1_1_1:
242                 spifi->mcmd = SPIFI_CMD_FIELDFORM_ALL_SERIAL;
243                 break;
244         case SNOR_PROTO_1_1_2:
245         case SNOR_PROTO_1_1_4:
246                 spifi->mcmd = SPIFI_CMD_FIELDFORM_QUAD_DUAL_DATA;
247                 break;
248         default:
249                 dev_err(spifi->dev, "unsupported SPI read mode\n");
250                 return -EINVAL;
251         }
252
253         /* Memory mode supports address length between 1 and 4 */
254         if (spifi->nor.addr_nbytes < 1 || spifi->nor.addr_nbytes > 4)
255                 return -EINVAL;
256
257         spifi->mcmd |= SPIFI_CMD_OPCODE(spifi->nor.read_opcode) |
258                        SPIFI_CMD_INTLEN(spifi->nor.read_dummy / 8) |
259                        SPIFI_CMD_FRAMEFORM(spifi->nor.addr_nbytes + 1);
260
261         return 0;
262 }
263
264 static void nxp_spifi_dummy_id_read(struct spi_nor *nor)
265 {
266         u8 id[SPI_NOR_MAX_ID_LEN];
267         nor->controller_ops->read_reg(nor, SPINOR_OP_RDID, id,
268                                       SPI_NOR_MAX_ID_LEN);
269 }
270
271 static const struct spi_nor_controller_ops nxp_spifi_controller_ops = {
272         .read_reg  = nxp_spifi_read_reg,
273         .write_reg = nxp_spifi_write_reg,
274         .read  = nxp_spifi_read,
275         .write = nxp_spifi_write,
276         .erase = nxp_spifi_erase,
277 };
278
279 static int nxp_spifi_setup_flash(struct nxp_spifi *spifi,
280                                  struct device_node *np)
281 {
282         struct spi_nor_hwcaps hwcaps = {
283                 .mask = SNOR_HWCAPS_READ |
284                         SNOR_HWCAPS_READ_FAST |
285                         SNOR_HWCAPS_PP,
286         };
287         u32 ctrl, property;
288         u16 mode = 0;
289         int ret;
290
291         if (!of_property_read_u32(np, "spi-rx-bus-width", &property)) {
292                 switch (property) {
293                 case 1:
294                         break;
295                 case 2:
296                         mode |= SPI_RX_DUAL;
297                         break;
298                 case 4:
299                         mode |= SPI_RX_QUAD;
300                         break;
301                 default:
302                         dev_err(spifi->dev, "unsupported rx-bus-width\n");
303                         return -EINVAL;
304                 }
305         }
306
307         if (of_property_read_bool(np, "spi-cpha"))
308                 mode |= SPI_CPHA;
309
310         if (of_property_read_bool(np, "spi-cpol"))
311                 mode |= SPI_CPOL;
312
313         /* Setup control register defaults */
314         ctrl = SPIFI_CTRL_TIMEOUT(1000) |
315                SPIFI_CTRL_CSHIGH(15) |
316                SPIFI_CTRL_FBCLK;
317
318         if (mode & SPI_RX_DUAL) {
319                 ctrl |= SPIFI_CTRL_DUAL;
320                 hwcaps.mask |= SNOR_HWCAPS_READ_1_1_2;
321         } else if (mode & SPI_RX_QUAD) {
322                 ctrl &= ~SPIFI_CTRL_DUAL;
323                 hwcaps.mask |= SNOR_HWCAPS_READ_1_1_4;
324         } else {
325                 ctrl |= SPIFI_CTRL_DUAL;
326         }
327
328         switch (mode & SPI_MODE_X_MASK) {
329         case SPI_MODE_0:
330                 ctrl &= ~SPIFI_CTRL_MODE3;
331                 break;
332         case SPI_MODE_3:
333                 ctrl |= SPIFI_CTRL_MODE3;
334                 break;
335         default:
336                 dev_err(spifi->dev, "only mode 0 and 3 supported\n");
337                 return -EINVAL;
338         }
339
340         writel(ctrl, spifi->io_base + SPIFI_CTRL);
341
342         spifi->nor.dev   = spifi->dev;
343         spi_nor_set_flash_node(&spifi->nor, np);
344         spifi->nor.priv  = spifi;
345         spifi->nor.controller_ops = &nxp_spifi_controller_ops;
346
347         /*
348          * The first read on a hard reset isn't reliable so do a
349          * dummy read of the id before calling spi_nor_scan().
350          * The reason for this problem is unknown.
351          *
352          * The official NXP spifilib uses more or less the same
353          * workaround that is applied here by reading the device
354          * id multiple times.
355          */
356         nxp_spifi_dummy_id_read(&spifi->nor);
357
358         ret = spi_nor_scan(&spifi->nor, NULL, &hwcaps);
359         if (ret) {
360                 dev_err(spifi->dev, "device scan failed\n");
361                 return ret;
362         }
363
364         ret = nxp_spifi_setup_memory_cmd(spifi);
365         if (ret) {
366                 dev_err(spifi->dev, "memory command setup failed\n");
367                 return ret;
368         }
369
370         ret = mtd_device_register(&spifi->nor.mtd, NULL, 0);
371         if (ret) {
372                 dev_err(spifi->dev, "mtd device parse failed\n");
373                 return ret;
374         }
375
376         return 0;
377 }
378
379 static int nxp_spifi_probe(struct platform_device *pdev)
380 {
381         struct device_node *flash_np;
382         struct nxp_spifi *spifi;
383         int ret;
384
385         spifi = devm_kzalloc(&pdev->dev, sizeof(*spifi), GFP_KERNEL);
386         if (!spifi)
387                 return -ENOMEM;
388
389         spifi->io_base = devm_platform_ioremap_resource_byname(pdev, "spifi");
390         if (IS_ERR(spifi->io_base))
391                 return PTR_ERR(spifi->io_base);
392
393         spifi->flash_base = devm_platform_ioremap_resource_byname(pdev, "flash");
394         if (IS_ERR(spifi->flash_base))
395                 return PTR_ERR(spifi->flash_base);
396
397         spifi->clk_spifi = devm_clk_get_enabled(&pdev->dev, "spifi");
398         if (IS_ERR(spifi->clk_spifi)) {
399                 dev_err(&pdev->dev, "spifi clock not found or unable to enable\n");
400                 return PTR_ERR(spifi->clk_spifi);
401         }
402
403         spifi->clk_reg = devm_clk_get_enabled(&pdev->dev, "reg");
404         if (IS_ERR(spifi->clk_reg)) {
405                 dev_err(&pdev->dev, "reg clock not found or unable to enable\n");
406                 return PTR_ERR(spifi->clk_reg);
407         }
408
409         spifi->dev = &pdev->dev;
410         platform_set_drvdata(pdev, spifi);
411
412         /* Initialize and reset device */
413         nxp_spifi_reset(spifi);
414         writel(0, spifi->io_base + SPIFI_IDATA);
415         writel(0, spifi->io_base + SPIFI_MCMD);
416         nxp_spifi_reset(spifi);
417
418         flash_np = of_get_next_available_child(pdev->dev.of_node, NULL);
419         if (!flash_np) {
420                 dev_err(&pdev->dev, "no SPI flash device to configure\n");
421                 return -ENODEV;
422         }
423
424         ret = nxp_spifi_setup_flash(spifi, flash_np);
425         of_node_put(flash_np);
426         if (ret) {
427                 dev_err(&pdev->dev, "unable to setup flash chip\n");
428                 return ret;
429         }
430
431         return 0;
432 }
433
434 static void nxp_spifi_remove(struct platform_device *pdev)
435 {
436         struct nxp_spifi *spifi = platform_get_drvdata(pdev);
437
438         mtd_device_unregister(&spifi->nor.mtd);
439 }
440
441 static const struct of_device_id nxp_spifi_match[] = {
442         {.compatible = "nxp,lpc1773-spifi"},
443         { /* sentinel */ }
444 };
445 MODULE_DEVICE_TABLE(of, nxp_spifi_match);
446
447 static struct platform_driver nxp_spifi_driver = {
448         .probe  = nxp_spifi_probe,
449         .remove_new = nxp_spifi_remove,
450         .driver = {
451                 .name = "nxp-spifi",
452                 .of_match_table = nxp_spifi_match,
453         },
454 };
455 module_platform_driver(nxp_spifi_driver);
456
457 MODULE_DESCRIPTION("NXP SPI Flash Interface driver");
458 MODULE_AUTHOR("Joachim Eastwood <[email protected]>");
459 MODULE_LICENSE("GPL v2");
This page took 0.063409 seconds and 4 git commands to generate.