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aa62e90f JY |
1 | /* |
2 | * linux/arch/arm/mach-omap2/gpmc-onenand.c | |
3 | * | |
4 | * Copyright (C) 2006 - 2009 Nokia Corporation | |
5 | * Contacts: Juha Yrjola | |
6 | * Tony Lindgren | |
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 version 2 as | |
10 | * published by the Free Software Foundation. | |
11 | */ | |
12 | ||
d44b28c4 | 13 | #include <linux/string.h> |
aa62e90f JY |
14 | #include <linux/kernel.h> |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/mtd/onenand_regs.h> | |
17 | #include <linux/io.h> | |
e639cd5b | 18 | #include <linux/omap-gpmc.h> |
2203747c | 19 | #include <linux/platform_data/mtd-onenand-omap2.h> |
46376884 | 20 | #include <linux/err.h> |
aa62e90f JY |
21 | |
22 | #include <asm/mach/flash.h> | |
23 | ||
dbc04161 TL |
24 | #include "soc.h" |
25 | ||
681988ba AM |
26 | #define ONENAND_IO_SIZE SZ_128K |
27 | ||
46376884 AM |
28 | #define ONENAND_FLAG_SYNCREAD (1 << 0) |
29 | #define ONENAND_FLAG_SYNCWRITE (1 << 1) | |
30 | #define ONENAND_FLAG_HF (1 << 2) | |
31 | #define ONENAND_FLAG_VHF (1 << 3) | |
32 | ||
33 | static unsigned onenand_flags; | |
34 | static unsigned latency; | |
46376884 | 35 | |
aa62e90f JY |
36 | static struct omap_onenand_platform_data *gpmc_onenand_data; |
37 | ||
681988ba AM |
38 | static struct resource gpmc_onenand_resource = { |
39 | .flags = IORESOURCE_MEM, | |
40 | }; | |
41 | ||
aa62e90f JY |
42 | static struct platform_device gpmc_onenand_device = { |
43 | .name = "omap2-onenand", | |
44 | .id = -1, | |
681988ba AM |
45 | .num_resources = 1, |
46 | .resource = &gpmc_onenand_resource, | |
aa62e90f JY |
47 | }; |
48 | ||
c3be5b45 | 49 | static struct gpmc_settings onenand_async = { |
3aef65ee | 50 | .device_width = GPMC_DEVWIDTH_16BIT, |
c3be5b45 JH |
51 | .mux_add_data = GPMC_MUX_AD, |
52 | }; | |
53 | ||
54 | static struct gpmc_settings onenand_sync = { | |
55 | .burst_read = true, | |
3aef65ee JH |
56 | .burst_wrap = true, |
57 | .burst_len = GPMC_BURST_16, | |
58 | .device_width = GPMC_DEVWIDTH_16BIT, | |
c3be5b45 | 59 | .mux_add_data = GPMC_MUX_AD, |
3aef65ee | 60 | .wait_pin = 0, |
c3be5b45 JH |
61 | }; |
62 | ||
be9f10c0 | 63 | static void omap2_onenand_calc_async_timings(struct gpmc_timings *t) |
aa62e90f | 64 | { |
4f4426f9 | 65 | struct gpmc_device_timings dev_t; |
aa62e90f JY |
66 | const int t_cer = 15; |
67 | const int t_avdp = 12; | |
68 | const int t_aavdh = 7; | |
69 | const int t_ce = 76; | |
70 | const int t_aa = 76; | |
71 | const int t_oe = 20; | |
72 | const int t_cez = 20; /* max of t_cez, t_oez */ | |
aa62e90f JY |
73 | const int t_wpl = 40; |
74 | const int t_wph = 30; | |
75 | ||
4f4426f9 AM |
76 | memset(&dev_t, 0, sizeof(dev_t)); |
77 | ||
4f4426f9 AM |
78 | dev_t.t_avdp_r = max_t(int, t_avdp, t_cer) * 1000; |
79 | dev_t.t_avdp_w = dev_t.t_avdp_r; | |
80 | dev_t.t_aavdh = t_aavdh * 1000; | |
81 | dev_t.t_aa = t_aa * 1000; | |
82 | dev_t.t_ce = t_ce * 1000; | |
83 | dev_t.t_oe = t_oe * 1000; | |
84 | dev_t.t_cez_r = t_cez * 1000; | |
85 | dev_t.t_cez_w = dev_t.t_cez_r; | |
86 | dev_t.t_wpl = t_wpl * 1000; | |
87 | dev_t.t_wph = t_wph * 1000; | |
88 | ||
c3be5b45 | 89 | gpmc_calc_timings(t, &onenand_async, &dev_t); |
46376884 AM |
90 | } |
91 | ||
46376884 AM |
92 | static void omap2_onenand_set_async_mode(void __iomem *onenand_base) |
93 | { | |
94 | u32 reg; | |
6d453e84 AH |
95 | |
96 | /* Ensure sync read and sync write are disabled */ | |
97 | reg = readw(onenand_base + ONENAND_REG_SYS_CFG1); | |
98 | reg &= ~ONENAND_SYS_CFG1_SYNC_READ & ~ONENAND_SYS_CFG1_SYNC_WRITE; | |
99 | writew(reg, onenand_base + ONENAND_REG_SYS_CFG1); | |
aa62e90f JY |
100 | } |
101 | ||
46376884 | 102 | static void set_onenand_cfg(void __iomem *onenand_base) |
aa62e90f JY |
103 | { |
104 | u32 reg; | |
105 | ||
106 | reg = readw(onenand_base + ONENAND_REG_SYS_CFG1); | |
107 | reg &= ~((0x7 << ONENAND_SYS_CFG1_BRL_SHIFT) | (0x7 << 9)); | |
108 | reg |= (latency << ONENAND_SYS_CFG1_BRL_SHIFT) | | |
109 | ONENAND_SYS_CFG1_BL_16; | |
46376884 | 110 | if (onenand_flags & ONENAND_FLAG_SYNCREAD) |
aa62e90f JY |
111 | reg |= ONENAND_SYS_CFG1_SYNC_READ; |
112 | else | |
113 | reg &= ~ONENAND_SYS_CFG1_SYNC_READ; | |
46376884 | 114 | if (onenand_flags & ONENAND_FLAG_SYNCWRITE) |
aa62e90f JY |
115 | reg |= ONENAND_SYS_CFG1_SYNC_WRITE; |
116 | else | |
117 | reg &= ~ONENAND_SYS_CFG1_SYNC_WRITE; | |
46376884 | 118 | if (onenand_flags & ONENAND_FLAG_HF) |
aa62e90f JY |
119 | reg |= ONENAND_SYS_CFG1_HF; |
120 | else | |
121 | reg &= ~ONENAND_SYS_CFG1_HF; | |
46376884 | 122 | if (onenand_flags & ONENAND_FLAG_VHF) |
1435ca0f AH |
123 | reg |= ONENAND_SYS_CFG1_VHF; |
124 | else | |
125 | reg &= ~ONENAND_SYS_CFG1_VHF; | |
aa62e90f JY |
126 | writew(reg, onenand_base + ONENAND_REG_SYS_CFG1); |
127 | } | |
128 | ||
5714b7ed | 129 | static int omap2_onenand_get_freq(struct omap_onenand_platform_data *cfg, |
757ef791 | 130 | void __iomem *onenand_base) |
5714b7ed AH |
131 | { |
132 | u16 ver = readw(onenand_base + ONENAND_REG_VERSION_ID); | |
757ef791 | 133 | int freq; |
5714b7ed AH |
134 | |
135 | switch ((ver >> 4) & 0xf) { | |
136 | case 0: | |
137 | freq = 40; | |
138 | break; | |
139 | case 1: | |
140 | freq = 54; | |
141 | break; | |
142 | case 2: | |
143 | freq = 66; | |
144 | break; | |
145 | case 3: | |
146 | freq = 83; | |
147 | break; | |
148 | case 4: | |
149 | freq = 104; | |
150 | break; | |
151 | default: | |
152 | freq = 54; | |
153 | break; | |
154 | } | |
155 | ||
156 | return freq; | |
157 | } | |
158 | ||
be9f10c0 JH |
159 | static void omap2_onenand_calc_sync_timings(struct gpmc_timings *t, |
160 | unsigned int flags, | |
161 | int freq) | |
aa62e90f | 162 | { |
4f4426f9 | 163 | struct gpmc_device_timings dev_t; |
aa62e90f JY |
164 | const int t_cer = 15; |
165 | const int t_avdp = 12; | |
166 | const int t_cez = 20; /* max of t_cez, t_oez */ | |
aa62e90f JY |
167 | const int t_wpl = 40; |
168 | const int t_wph = 30; | |
169 | int min_gpmc_clk_period, t_ces, t_avds, t_avdh, t_ach, t_aavdh, t_rdyo; | |
4f4426f9 | 170 | int div, gpmc_clk_ns; |
aa62e90f | 171 | |
be9f10c0 | 172 | if (flags & ONENAND_SYNC_READ) |
46376884 | 173 | onenand_flags = ONENAND_FLAG_SYNCREAD; |
be9f10c0 | 174 | else if (flags & ONENAND_SYNC_READWRITE) |
46376884 | 175 | onenand_flags = ONENAND_FLAG_SYNCREAD | ONENAND_FLAG_SYNCWRITE; |
aa62e90f JY |
176 | |
177 | switch (freq) { | |
4931445b AH |
178 | case 104: |
179 | min_gpmc_clk_period = 9600; /* 104 MHz */ | |
180 | t_ces = 3; | |
181 | t_avds = 4; | |
182 | t_avdh = 2; | |
183 | t_ach = 3; | |
184 | t_aavdh = 6; | |
1435ca0f | 185 | t_rdyo = 6; |
4931445b | 186 | break; |
aa62e90f | 187 | case 83: |
a3551f5b | 188 | min_gpmc_clk_period = 12000; /* 83 MHz */ |
aa62e90f JY |
189 | t_ces = 5; |
190 | t_avds = 4; | |
191 | t_avdh = 2; | |
192 | t_ach = 6; | |
193 | t_aavdh = 6; | |
194 | t_rdyo = 9; | |
195 | break; | |
196 | case 66: | |
a3551f5b | 197 | min_gpmc_clk_period = 15000; /* 66 MHz */ |
aa62e90f JY |
198 | t_ces = 6; |
199 | t_avds = 5; | |
200 | t_avdh = 2; | |
201 | t_ach = 6; | |
202 | t_aavdh = 6; | |
203 | t_rdyo = 11; | |
204 | break; | |
205 | default: | |
a3551f5b | 206 | min_gpmc_clk_period = 18500; /* 54 MHz */ |
aa62e90f JY |
207 | t_ces = 7; |
208 | t_avds = 7; | |
209 | t_avdh = 7; | |
210 | t_ach = 9; | |
211 | t_aavdh = 7; | |
212 | t_rdyo = 15; | |
46376884 | 213 | onenand_flags &= ~ONENAND_FLAG_SYNCWRITE; |
aa62e90f JY |
214 | break; |
215 | } | |
216 | ||
1b47ca1a | 217 | div = gpmc_calc_divider(min_gpmc_clk_period); |
aa62e90f | 218 | gpmc_clk_ns = gpmc_ticks_to_ns(div); |
6a53bc75 | 219 | if (gpmc_clk_ns < 15) /* >66MHz */ |
46376884 AM |
220 | onenand_flags |= ONENAND_FLAG_HF; |
221 | else | |
222 | onenand_flags &= ~ONENAND_FLAG_HF; | |
6a53bc75 | 223 | if (gpmc_clk_ns < 12) /* >83MHz */ |
46376884 AM |
224 | onenand_flags |= ONENAND_FLAG_VHF; |
225 | else | |
226 | onenand_flags &= ~ONENAND_FLAG_VHF; | |
227 | if (onenand_flags & ONENAND_FLAG_VHF) | |
1435ca0f | 228 | latency = 8; |
46376884 | 229 | else if (onenand_flags & ONENAND_FLAG_HF) |
aa62e90f JY |
230 | latency = 6; |
231 | else if (gpmc_clk_ns >= 25) /* 40 MHz*/ | |
232 | latency = 3; | |
233 | else | |
234 | latency = 4; | |
235 | ||
46376884 | 236 | /* Set synchronous read timings */ |
4f4426f9 | 237 | memset(&dev_t, 0, sizeof(dev_t)); |
aa62e90f | 238 | |
3aef65ee JH |
239 | if (onenand_flags & ONENAND_FLAG_SYNCREAD) |
240 | onenand_sync.sync_read = true; | |
46376884 | 241 | if (onenand_flags & ONENAND_FLAG_SYNCWRITE) { |
c3be5b45 | 242 | onenand_sync.sync_write = true; |
3aef65ee | 243 | onenand_sync.burst_write = true; |
aa62e90f | 244 | } else { |
4f4426f9 AM |
245 | dev_t.t_avdp_w = max(t_avdp, t_cer) * 1000; |
246 | dev_t.t_wpl = t_wpl * 1000; | |
247 | dev_t.t_wph = t_wph * 1000; | |
248 | dev_t.t_aavdh = t_aavdh * 1000; | |
aa62e90f | 249 | } |
4f4426f9 AM |
250 | dev_t.ce_xdelay = true; |
251 | dev_t.avd_xdelay = true; | |
252 | dev_t.oe_xdelay = true; | |
253 | dev_t.we_xdelay = true; | |
254 | dev_t.clk = min_gpmc_clk_period; | |
255 | dev_t.t_bacc = dev_t.clk; | |
256 | dev_t.t_ces = t_ces * 1000; | |
257 | dev_t.t_avds = t_avds * 1000; | |
258 | dev_t.t_avdh = t_avdh * 1000; | |
259 | dev_t.t_ach = t_ach * 1000; | |
260 | dev_t.cyc_iaa = (latency + 1); | |
261 | dev_t.t_cez_r = t_cez * 1000; | |
262 | dev_t.t_cez_w = dev_t.t_cez_r; | |
263 | dev_t.cyc_aavdh_oe = 1; | |
264 | dev_t.t_rdyo = t_rdyo * 1000 + min_gpmc_clk_period; | |
265 | ||
c3be5b45 | 266 | gpmc_calc_timings(t, &onenand_sync, &dev_t); |
46376884 AM |
267 | } |
268 | ||
46376884 AM |
269 | static int omap2_onenand_setup_async(void __iomem *onenand_base) |
270 | { | |
271 | struct gpmc_timings t; | |
272 | int ret; | |
273 | ||
1dc1c338 | 274 | if (gpmc_onenand_data->of_node) { |
32cde0b5 JH |
275 | gpmc_read_settings_dt(gpmc_onenand_data->of_node, |
276 | &onenand_async); | |
1dc1c338 AK |
277 | if (onenand_async.sync_read || onenand_async.sync_write) { |
278 | if (onenand_async.sync_write) | |
279 | gpmc_onenand_data->flags |= | |
280 | ONENAND_SYNC_READWRITE; | |
281 | else | |
282 | gpmc_onenand_data->flags |= ONENAND_SYNC_READ; | |
283 | onenand_async.sync_read = false; | |
284 | onenand_async.sync_write = false; | |
285 | } | |
286 | } | |
32cde0b5 | 287 | |
46376884 AM |
288 | omap2_onenand_set_async_mode(onenand_base); |
289 | ||
be9f10c0 | 290 | omap2_onenand_calc_async_timings(&t); |
46376884 | 291 | |
3aef65ee JH |
292 | ret = gpmc_cs_program_settings(gpmc_onenand_data->cs, &onenand_async); |
293 | if (ret < 0) | |
294 | return ret; | |
295 | ||
2e676901 | 296 | ret = gpmc_cs_set_timings(gpmc_onenand_data->cs, &t, &onenand_async); |
71856843 | 297 | if (ret < 0) |
46376884 AM |
298 | return ret; |
299 | ||
300 | omap2_onenand_set_async_mode(onenand_base); | |
301 | ||
302 | return 0; | |
303 | } | |
304 | ||
305 | static int omap2_onenand_setup_sync(void __iomem *onenand_base, int *freq_ptr) | |
306 | { | |
307 | int ret, freq = *freq_ptr; | |
308 | struct gpmc_timings t; | |
46376884 AM |
309 | |
310 | if (!freq) { | |
311 | /* Very first call freq is not known */ | |
757ef791 | 312 | freq = omap2_onenand_get_freq(gpmc_onenand_data, onenand_base); |
46376884 AM |
313 | set_onenand_cfg(onenand_base); |
314 | } | |
315 | ||
32cde0b5 JH |
316 | if (gpmc_onenand_data->of_node) { |
317 | gpmc_read_settings_dt(gpmc_onenand_data->of_node, | |
318 | &onenand_sync); | |
319 | } else { | |
320 | /* | |
321 | * FIXME: Appears to be legacy code from initial ONENAND commit. | |
322 | * Unclear what boards this is for and if this can be removed. | |
323 | */ | |
324 | if (!cpu_is_omap34xx()) | |
325 | onenand_sync.wait_on_read = true; | |
326 | } | |
3aef65ee | 327 | |
be9f10c0 | 328 | omap2_onenand_calc_sync_timings(&t, gpmc_onenand_data->flags, freq); |
aa62e90f | 329 | |
3aef65ee JH |
330 | ret = gpmc_cs_program_settings(gpmc_onenand_data->cs, &onenand_sync); |
331 | if (ret < 0) | |
332 | return ret; | |
333 | ||
2e676901 | 334 | ret = gpmc_cs_set_timings(gpmc_onenand_data->cs, &t, &onenand_sync); |
71856843 | 335 | if (ret < 0) |
46376884 AM |
336 | return ret; |
337 | ||
338 | set_onenand_cfg(onenand_base); | |
aa62e90f | 339 | |
3ad2d861 AH |
340 | *freq_ptr = freq; |
341 | ||
aa62e90f JY |
342 | return 0; |
343 | } | |
344 | ||
3ad2d861 | 345 | static int gpmc_onenand_setup(void __iomem *onenand_base, int *freq_ptr) |
aa62e90f JY |
346 | { |
347 | struct device *dev = &gpmc_onenand_device.dev; | |
46376884 AM |
348 | unsigned l = ONENAND_SYNC_READ | ONENAND_SYNC_READWRITE; |
349 | int ret; | |
aa62e90f | 350 | |
46376884 AM |
351 | ret = omap2_onenand_setup_async(onenand_base); |
352 | if (ret) { | |
353 | dev_err(dev, "unable to set to async mode\n"); | |
354 | return ret; | |
aa62e90f JY |
355 | } |
356 | ||
46376884 AM |
357 | if (!(gpmc_onenand_data->flags & l)) |
358 | return 0; | |
359 | ||
360 | ret = omap2_onenand_setup_sync(onenand_base, freq_ptr); | |
361 | if (ret) | |
362 | dev_err(dev, "unable to set to sync mode\n"); | |
363 | return ret; | |
aa62e90f JY |
364 | } |
365 | ||
faf5d2ff | 366 | void gpmc_onenand_init(struct omap_onenand_platform_data *_onenand_data) |
aa62e90f | 367 | { |
681988ba | 368 | int err; |
df25cb46 | 369 | struct device *dev = &gpmc_onenand_device.dev; |
681988ba | 370 | |
aa62e90f JY |
371 | gpmc_onenand_data = _onenand_data; |
372 | gpmc_onenand_data->onenand_setup = gpmc_onenand_setup; | |
373 | gpmc_onenand_device.dev.platform_data = gpmc_onenand_data; | |
374 | ||
375 | if (cpu_is_omap24xx() && | |
376 | (gpmc_onenand_data->flags & ONENAND_SYNC_READWRITE)) { | |
7ab91596 | 377 | dev_warn(dev, "OneNAND using only SYNC_READ on 24xx\n"); |
aa62e90f JY |
378 | gpmc_onenand_data->flags &= ~ONENAND_SYNC_READWRITE; |
379 | gpmc_onenand_data->flags |= ONENAND_SYNC_READ; | |
380 | } | |
381 | ||
eb77b6a7 AM |
382 | if (cpu_is_omap34xx()) |
383 | gpmc_onenand_data->flags |= ONENAND_IN_OMAP34XX; | |
384 | else | |
385 | gpmc_onenand_data->flags &= ~ONENAND_IN_OMAP34XX; | |
386 | ||
681988ba AM |
387 | err = gpmc_cs_request(gpmc_onenand_data->cs, ONENAND_IO_SIZE, |
388 | (unsigned long *)&gpmc_onenand_resource.start); | |
389 | if (err < 0) { | |
df25cb46 EG |
390 | dev_err(dev, "Cannot request GPMC CS %d, error %d\n", |
391 | gpmc_onenand_data->cs, err); | |
681988ba AM |
392 | return; |
393 | } | |
394 | ||
395 | gpmc_onenand_resource.end = gpmc_onenand_resource.start + | |
396 | ONENAND_IO_SIZE - 1; | |
397 | ||
aa62e90f | 398 | if (platform_device_register(&gpmc_onenand_device) < 0) { |
df25cb46 | 399 | dev_err(dev, "Unable to register OneNAND device\n"); |
681988ba | 400 | gpmc_cs_free(gpmc_onenand_data->cs); |
aa62e90f JY |
401 | return; |
402 | } | |
403 | } |