Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/teigland/dlm
[linux-2.6] / drivers / mtd / nand / fsl_upm.c
1 /*
2  * Freescale UPM NAND driver.
3  *
4  * Copyright © 2007-2008  MontaVista Software, Inc.
5  *
6  * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; either version 2 of the License, or
11  * (at your option) any later version.
12  */
13
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/delay.h>
17 #include <linux/mtd/nand.h>
18 #include <linux/mtd/nand_ecc.h>
19 #include <linux/mtd/partitions.h>
20 #include <linux/mtd/mtd.h>
21 #include <linux/of_platform.h>
22 #include <linux/of_gpio.h>
23 #include <linux/io.h>
24 #include <asm/fsl_lbc.h>
25
26 #define FSL_UPM_WAIT_RUN_PATTERN  0x1
27 #define FSL_UPM_WAIT_WRITE_BYTE   0x2
28 #define FSL_UPM_WAIT_WRITE_BUFFER 0x4
29
30 struct fsl_upm_nand {
31         struct device *dev;
32         struct mtd_info mtd;
33         struct nand_chip chip;
34         int last_ctrl;
35 #ifdef CONFIG_MTD_PARTITIONS
36         struct mtd_partition *parts;
37 #endif
38
39         struct fsl_upm upm;
40         uint8_t upm_addr_offset;
41         uint8_t upm_cmd_offset;
42         void __iomem *io_base;
43         int rnb_gpio[NAND_MAX_CHIPS];
44         uint32_t mchip_offsets[NAND_MAX_CHIPS];
45         uint32_t mchip_count;
46         uint32_t mchip_number;
47         int chip_delay;
48         uint32_t wait_flags;
49 };
50
51 #define to_fsl_upm_nand(mtd) container_of(mtd, struct fsl_upm_nand, mtd)
52
53 static int fun_chip_ready(struct mtd_info *mtd)
54 {
55         struct fsl_upm_nand *fun = to_fsl_upm_nand(mtd);
56
57         if (gpio_get_value(fun->rnb_gpio[fun->mchip_number]))
58                 return 1;
59
60         dev_vdbg(fun->dev, "busy\n");
61         return 0;
62 }
63
64 static void fun_wait_rnb(struct fsl_upm_nand *fun)
65 {
66         if (fun->rnb_gpio[fun->mchip_number] >= 0) {
67                 int cnt = 1000000;
68
69                 while (--cnt && !fun_chip_ready(&fun->mtd))
70                         cpu_relax();
71                 if (!cnt)
72                         dev_err(fun->dev, "tired waiting for RNB\n");
73         } else {
74                 ndelay(100);
75         }
76 }
77
78 static void fun_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl)
79 {
80         struct nand_chip *chip = mtd->priv;
81         struct fsl_upm_nand *fun = to_fsl_upm_nand(mtd);
82         u32 mar;
83
84         if (!(ctrl & fun->last_ctrl)) {
85                 fsl_upm_end_pattern(&fun->upm);
86
87                 if (cmd == NAND_CMD_NONE)
88                         return;
89
90                 fun->last_ctrl = ctrl & (NAND_ALE | NAND_CLE);
91         }
92
93         if (ctrl & NAND_CTRL_CHANGE) {
94                 if (ctrl & NAND_ALE)
95                         fsl_upm_start_pattern(&fun->upm, fun->upm_addr_offset);
96                 else if (ctrl & NAND_CLE)
97                         fsl_upm_start_pattern(&fun->upm, fun->upm_cmd_offset);
98         }
99
100         mar = (cmd << (32 - fun->upm.width)) |
101                 fun->mchip_offsets[fun->mchip_number];
102         fsl_upm_run_pattern(&fun->upm, chip->IO_ADDR_R, mar);
103
104         if (fun->wait_flags & FSL_UPM_WAIT_RUN_PATTERN)
105                 fun_wait_rnb(fun);
106 }
107
108 static void fun_select_chip(struct mtd_info *mtd, int mchip_nr)
109 {
110         struct nand_chip *chip = mtd->priv;
111         struct fsl_upm_nand *fun = to_fsl_upm_nand(mtd);
112
113         if (mchip_nr == -1) {
114                 chip->cmd_ctrl(mtd, NAND_CMD_NONE, 0 | NAND_CTRL_CHANGE);
115         } else if (mchip_nr >= 0) {
116                 fun->mchip_number = mchip_nr;
117                 chip->IO_ADDR_R = fun->io_base + fun->mchip_offsets[mchip_nr];
118                 chip->IO_ADDR_W = chip->IO_ADDR_R;
119         } else {
120                 BUG();
121         }
122 }
123
124 static uint8_t fun_read_byte(struct mtd_info *mtd)
125 {
126         struct fsl_upm_nand *fun = to_fsl_upm_nand(mtd);
127
128         return in_8(fun->chip.IO_ADDR_R);
129 }
130
131 static void fun_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
132 {
133         struct fsl_upm_nand *fun = to_fsl_upm_nand(mtd);
134         int i;
135
136         for (i = 0; i < len; i++)
137                 buf[i] = in_8(fun->chip.IO_ADDR_R);
138 }
139
140 static void fun_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
141 {
142         struct fsl_upm_nand *fun = to_fsl_upm_nand(mtd);
143         int i;
144
145         for (i = 0; i < len; i++) {
146                 out_8(fun->chip.IO_ADDR_W, buf[i]);
147                 if (fun->wait_flags & FSL_UPM_WAIT_WRITE_BYTE)
148                         fun_wait_rnb(fun);
149         }
150         if (fun->wait_flags & FSL_UPM_WAIT_WRITE_BUFFER)
151                 fun_wait_rnb(fun);
152 }
153
154 static int __devinit fun_chip_init(struct fsl_upm_nand *fun,
155                                    const struct device_node *upm_np,
156                                    const struct resource *io_res)
157 {
158         int ret;
159         struct device_node *flash_np;
160 #ifdef CONFIG_MTD_PARTITIONS
161         static const char *part_types[] = { "cmdlinepart", NULL, };
162 #endif
163
164         fun->chip.IO_ADDR_R = fun->io_base;
165         fun->chip.IO_ADDR_W = fun->io_base;
166         fun->chip.cmd_ctrl = fun_cmd_ctrl;
167         fun->chip.chip_delay = fun->chip_delay;
168         fun->chip.read_byte = fun_read_byte;
169         fun->chip.read_buf = fun_read_buf;
170         fun->chip.write_buf = fun_write_buf;
171         fun->chip.ecc.mode = NAND_ECC_SOFT;
172         if (fun->mchip_count > 1)
173                 fun->chip.select_chip = fun_select_chip;
174
175         if (fun->rnb_gpio[0] >= 0)
176                 fun->chip.dev_ready = fun_chip_ready;
177
178         fun->mtd.priv = &fun->chip;
179         fun->mtd.owner = THIS_MODULE;
180
181         flash_np = of_get_next_child(upm_np, NULL);
182         if (!flash_np)
183                 return -ENODEV;
184
185         fun->mtd.name = kasprintf(GFP_KERNEL, "%x.%s", io_res->start,
186                                   flash_np->name);
187         if (!fun->mtd.name) {
188                 ret = -ENOMEM;
189                 goto err;
190         }
191
192         ret = nand_scan(&fun->mtd, fun->mchip_count);
193         if (ret)
194                 goto err;
195
196 #ifdef CONFIG_MTD_PARTITIONS
197         ret = parse_mtd_partitions(&fun->mtd, part_types, &fun->parts, 0);
198
199 #ifdef CONFIG_MTD_OF_PARTS
200         if (ret == 0) {
201                 ret = of_mtd_parse_partitions(fun->dev, flash_np, &fun->parts);
202                 if (ret < 0)
203                         goto err;
204         }
205 #endif
206         if (ret > 0)
207                 ret = add_mtd_partitions(&fun->mtd, fun->parts, ret);
208         else
209 #endif
210                 ret = add_mtd_device(&fun->mtd);
211 err:
212         of_node_put(flash_np);
213         return ret;
214 }
215
216 static int __devinit fun_probe(struct of_device *ofdev,
217                                const struct of_device_id *ofid)
218 {
219         struct fsl_upm_nand *fun;
220         struct resource io_res;
221         const uint32_t *prop;
222         int rnb_gpio;
223         int ret;
224         int size;
225         int i;
226
227         fun = kzalloc(sizeof(*fun), GFP_KERNEL);
228         if (!fun)
229                 return -ENOMEM;
230
231         ret = of_address_to_resource(ofdev->node, 0, &io_res);
232         if (ret) {
233                 dev_err(&ofdev->dev, "can't get IO base\n");
234                 goto err1;
235         }
236
237         ret = fsl_upm_find(io_res.start, &fun->upm);
238         if (ret) {
239                 dev_err(&ofdev->dev, "can't find UPM\n");
240                 goto err1;
241         }
242
243         prop = of_get_property(ofdev->node, "fsl,upm-addr-offset", &size);
244         if (!prop || size != sizeof(uint32_t)) {
245                 dev_err(&ofdev->dev, "can't get UPM address offset\n");
246                 ret = -EINVAL;
247                 goto err1;
248         }
249         fun->upm_addr_offset = *prop;
250
251         prop = of_get_property(ofdev->node, "fsl,upm-cmd-offset", &size);
252         if (!prop || size != sizeof(uint32_t)) {
253                 dev_err(&ofdev->dev, "can't get UPM command offset\n");
254                 ret = -EINVAL;
255                 goto err1;
256         }
257         fun->upm_cmd_offset = *prop;
258
259         prop = of_get_property(ofdev->node,
260                                "fsl,upm-addr-line-cs-offsets", &size);
261         if (prop && (size / sizeof(uint32_t)) > 0) {
262                 fun->mchip_count = size / sizeof(uint32_t);
263                 if (fun->mchip_count >= NAND_MAX_CHIPS) {
264                         dev_err(&ofdev->dev, "too much multiple chips\n");
265                         goto err1;
266                 }
267                 for (i = 0; i < fun->mchip_count; i++)
268                         fun->mchip_offsets[i] = prop[i];
269         } else {
270                 fun->mchip_count = 1;
271         }
272
273         for (i = 0; i < fun->mchip_count; i++) {
274                 fun->rnb_gpio[i] = -1;
275                 rnb_gpio = of_get_gpio(ofdev->node, i);
276                 if (rnb_gpio >= 0) {
277                         ret = gpio_request(rnb_gpio, dev_name(&ofdev->dev));
278                         if (ret) {
279                                 dev_err(&ofdev->dev,
280                                         "can't request RNB gpio #%d\n", i);
281                                 goto err2;
282                         }
283                         gpio_direction_input(rnb_gpio);
284                         fun->rnb_gpio[i] = rnb_gpio;
285                 } else if (rnb_gpio == -EINVAL) {
286                         dev_err(&ofdev->dev, "RNB gpio #%d is invalid\n", i);
287                         goto err2;
288                 }
289         }
290
291         prop = of_get_property(ofdev->node, "chip-delay", NULL);
292         if (prop)
293                 fun->chip_delay = *prop;
294         else
295                 fun->chip_delay = 50;
296
297         prop = of_get_property(ofdev->node, "fsl,upm-wait-flags", &size);
298         if (prop && size == sizeof(uint32_t))
299                 fun->wait_flags = *prop;
300         else
301                 fun->wait_flags = FSL_UPM_WAIT_RUN_PATTERN |
302                                   FSL_UPM_WAIT_WRITE_BYTE;
303
304         fun->io_base = devm_ioremap_nocache(&ofdev->dev, io_res.start,
305                                             io_res.end - io_res.start + 1);
306         if (!fun->io_base) {
307                 ret = -ENOMEM;
308                 goto err2;
309         }
310
311         fun->dev = &ofdev->dev;
312         fun->last_ctrl = NAND_CLE;
313
314         ret = fun_chip_init(fun, ofdev->node, &io_res);
315         if (ret)
316                 goto err2;
317
318         dev_set_drvdata(&ofdev->dev, fun);
319
320         return 0;
321 err2:
322         for (i = 0; i < fun->mchip_count; i++) {
323                 if (fun->rnb_gpio[i] < 0)
324                         break;
325                 gpio_free(fun->rnb_gpio[i]);
326         }
327 err1:
328         kfree(fun);
329
330         return ret;
331 }
332
333 static int __devexit fun_remove(struct of_device *ofdev)
334 {
335         struct fsl_upm_nand *fun = dev_get_drvdata(&ofdev->dev);
336         int i;
337
338         nand_release(&fun->mtd);
339         kfree(fun->mtd.name);
340
341         for (i = 0; i < fun->mchip_count; i++) {
342                 if (fun->rnb_gpio[i] < 0)
343                         break;
344                 gpio_free(fun->rnb_gpio[i]);
345         }
346
347         kfree(fun);
348
349         return 0;
350 }
351
352 static struct of_device_id of_fun_match[] = {
353         { .compatible = "fsl,upm-nand" },
354         {},
355 };
356 MODULE_DEVICE_TABLE(of, of_fun_match);
357
358 static struct of_platform_driver of_fun_driver = {
359         .name           = "fsl,upm-nand",
360         .match_table    = of_fun_match,
361         .probe          = fun_probe,
362         .remove         = __devexit_p(fun_remove),
363 };
364
365 static int __init fun_module_init(void)
366 {
367         return of_register_platform_driver(&of_fun_driver);
368 }
369 module_init(fun_module_init);
370
371 static void __exit fun_module_exit(void)
372 {
373         of_unregister_platform_driver(&of_fun_driver);
374 }
375 module_exit(fun_module_exit);
376
377 MODULE_LICENSE("GPL");
378 MODULE_AUTHOR("Anton Vorontsov <avorontsov@ru.mvista.com>");
379 MODULE_DESCRIPTION("Driver for NAND chips working through Freescale "
380                    "LocalBus User-Programmable Machine");