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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> | |
18 | ||
19 | #include <asm/mach/flash.h> | |
20 | ||
2c799cef | 21 | #include <plat/cpu.h> |
ce491cf8 TL |
22 | #include <plat/onenand.h> |
23 | #include <plat/board.h> | |
24 | #include <plat/gpmc.h> | |
aa62e90f JY |
25 | |
26 | static struct omap_onenand_platform_data *gpmc_onenand_data; | |
27 | ||
28 | static struct platform_device gpmc_onenand_device = { | |
29 | .name = "omap2-onenand", | |
30 | .id = -1, | |
31 | }; | |
32 | ||
33 | static int omap2_onenand_set_async_mode(int cs, void __iomem *onenand_base) | |
34 | { | |
35 | struct gpmc_timings t; | |
6d453e84 AH |
36 | u32 reg; |
37 | int err; | |
aa62e90f JY |
38 | |
39 | const int t_cer = 15; | |
40 | const int t_avdp = 12; | |
41 | const int t_aavdh = 7; | |
42 | const int t_ce = 76; | |
43 | const int t_aa = 76; | |
44 | const int t_oe = 20; | |
45 | const int t_cez = 20; /* max of t_cez, t_oez */ | |
46 | const int t_ds = 30; | |
47 | const int t_wpl = 40; | |
48 | const int t_wph = 30; | |
49 | ||
6d453e84 AH |
50 | /* Ensure sync read and sync write are disabled */ |
51 | reg = readw(onenand_base + ONENAND_REG_SYS_CFG1); | |
52 | reg &= ~ONENAND_SYS_CFG1_SYNC_READ & ~ONENAND_SYS_CFG1_SYNC_WRITE; | |
53 | writew(reg, onenand_base + ONENAND_REG_SYS_CFG1); | |
54 | ||
aa62e90f JY |
55 | memset(&t, 0, sizeof(t)); |
56 | t.sync_clk = 0; | |
57 | t.cs_on = 0; | |
58 | t.adv_on = 0; | |
59 | ||
60 | /* Read */ | |
61 | t.adv_rd_off = gpmc_round_ns_to_ticks(max_t(int, t_avdp, t_cer)); | |
62 | t.oe_on = t.adv_rd_off + gpmc_round_ns_to_ticks(t_aavdh); | |
63 | t.access = t.adv_on + gpmc_round_ns_to_ticks(t_aa); | |
64 | t.access = max_t(int, t.access, t.cs_on + gpmc_round_ns_to_ticks(t_ce)); | |
65 | t.access = max_t(int, t.access, t.oe_on + gpmc_round_ns_to_ticks(t_oe)); | |
66 | t.oe_off = t.access + gpmc_round_ns_to_ticks(1); | |
67 | t.cs_rd_off = t.oe_off; | |
68 | t.rd_cycle = t.cs_rd_off + gpmc_round_ns_to_ticks(t_cez); | |
69 | ||
70 | /* Write */ | |
71 | t.adv_wr_off = t.adv_rd_off; | |
72 | t.we_on = t.oe_on; | |
73 | if (cpu_is_omap34xx()) { | |
74 | t.wr_data_mux_bus = t.we_on; | |
75 | t.wr_access = t.we_on + gpmc_round_ns_to_ticks(t_ds); | |
76 | } | |
77 | t.we_off = t.we_on + gpmc_round_ns_to_ticks(t_wpl); | |
78 | t.cs_wr_off = t.we_off + gpmc_round_ns_to_ticks(t_wph); | |
79 | t.wr_cycle = t.cs_wr_off + gpmc_round_ns_to_ticks(t_cez); | |
80 | ||
81 | /* Configure GPMC for asynchronous read */ | |
82 | gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, | |
83 | GPMC_CONFIG1_DEVICESIZE_16 | | |
84 | GPMC_CONFIG1_MUXADDDATA); | |
85 | ||
6d453e84 AH |
86 | err = gpmc_cs_set_timings(cs, &t); |
87 | if (err) | |
88 | return err; | |
89 | ||
90 | /* Ensure sync read and sync write are disabled */ | |
91 | reg = readw(onenand_base + ONENAND_REG_SYS_CFG1); | |
92 | reg &= ~ONENAND_SYS_CFG1_SYNC_READ & ~ONENAND_SYS_CFG1_SYNC_WRITE; | |
93 | writew(reg, onenand_base + ONENAND_REG_SYS_CFG1); | |
94 | ||
95 | return 0; | |
aa62e90f JY |
96 | } |
97 | ||
98 | static void set_onenand_cfg(void __iomem *onenand_base, int latency, | |
1435ca0f | 99 | int sync_read, int sync_write, int hf, int vhf) |
aa62e90f JY |
100 | { |
101 | u32 reg; | |
102 | ||
103 | reg = readw(onenand_base + ONENAND_REG_SYS_CFG1); | |
104 | reg &= ~((0x7 << ONENAND_SYS_CFG1_BRL_SHIFT) | (0x7 << 9)); | |
105 | reg |= (latency << ONENAND_SYS_CFG1_BRL_SHIFT) | | |
106 | ONENAND_SYS_CFG1_BL_16; | |
107 | if (sync_read) | |
108 | reg |= ONENAND_SYS_CFG1_SYNC_READ; | |
109 | else | |
110 | reg &= ~ONENAND_SYS_CFG1_SYNC_READ; | |
111 | if (sync_write) | |
112 | reg |= ONENAND_SYS_CFG1_SYNC_WRITE; | |
113 | else | |
114 | reg &= ~ONENAND_SYS_CFG1_SYNC_WRITE; | |
115 | if (hf) | |
116 | reg |= ONENAND_SYS_CFG1_HF; | |
117 | else | |
118 | reg &= ~ONENAND_SYS_CFG1_HF; | |
1435ca0f AH |
119 | if (vhf) |
120 | reg |= ONENAND_SYS_CFG1_VHF; | |
121 | else | |
122 | reg &= ~ONENAND_SYS_CFG1_VHF; | |
aa62e90f JY |
123 | writew(reg, onenand_base + ONENAND_REG_SYS_CFG1); |
124 | } | |
125 | ||
5714b7ed AH |
126 | static int omap2_onenand_get_freq(struct omap_onenand_platform_data *cfg, |
127 | void __iomem *onenand_base, bool *clk_dep) | |
128 | { | |
129 | u16 ver = readw(onenand_base + ONENAND_REG_VERSION_ID); | |
130 | int freq = 0; | |
131 | ||
132 | if (cfg->get_freq) { | |
133 | struct onenand_freq_info fi; | |
134 | ||
135 | fi.maf_id = readw(onenand_base + ONENAND_REG_MANUFACTURER_ID); | |
136 | fi.dev_id = readw(onenand_base + ONENAND_REG_DEVICE_ID); | |
137 | fi.ver_id = ver; | |
138 | freq = cfg->get_freq(&fi, clk_dep); | |
139 | if (freq) | |
140 | return freq; | |
141 | } | |
142 | ||
143 | switch ((ver >> 4) & 0xf) { | |
144 | case 0: | |
145 | freq = 40; | |
146 | break; | |
147 | case 1: | |
148 | freq = 54; | |
149 | break; | |
150 | case 2: | |
151 | freq = 66; | |
152 | break; | |
153 | case 3: | |
154 | freq = 83; | |
155 | break; | |
156 | case 4: | |
157 | freq = 104; | |
158 | break; | |
159 | default: | |
160 | freq = 54; | |
161 | break; | |
162 | } | |
163 | ||
164 | return freq; | |
165 | } | |
166 | ||
aa62e90f JY |
167 | static int omap2_onenand_set_sync_mode(struct omap_onenand_platform_data *cfg, |
168 | void __iomem *onenand_base, | |
3ad2d861 | 169 | int *freq_ptr) |
aa62e90f JY |
170 | { |
171 | struct gpmc_timings t; | |
172 | const int t_cer = 15; | |
173 | const int t_avdp = 12; | |
174 | const int t_cez = 20; /* max of t_cez, t_oez */ | |
175 | const int t_ds = 30; | |
176 | const int t_wpl = 40; | |
177 | const int t_wph = 30; | |
178 | int min_gpmc_clk_period, t_ces, t_avds, t_avdh, t_ach, t_aavdh, t_rdyo; | |
eeb3711b | 179 | int div, fclk_offset_ns, fclk_offset, gpmc_clk_ns, latency; |
1435ca0f | 180 | int first_time = 0, hf = 0, vhf = 0, sync_read = 0, sync_write = 0; |
aa62e90f | 181 | int err, ticks_cez; |
3ad2d861 | 182 | int cs = cfg->cs, freq = *freq_ptr; |
aa62e90f | 183 | u32 reg; |
5714b7ed | 184 | bool clk_dep = false; |
aa62e90f JY |
185 | |
186 | if (cfg->flags & ONENAND_SYNC_READ) { | |
187 | sync_read = 1; | |
188 | } else if (cfg->flags & ONENAND_SYNC_READWRITE) { | |
189 | sync_read = 1; | |
190 | sync_write = 1; | |
6d453e84 AH |
191 | } else |
192 | return omap2_onenand_set_async_mode(cs, onenand_base); | |
aa62e90f JY |
193 | |
194 | if (!freq) { | |
195 | /* Very first call freq is not known */ | |
196 | err = omap2_onenand_set_async_mode(cs, onenand_base); | |
197 | if (err) | |
198 | return err; | |
5714b7ed | 199 | freq = omap2_onenand_get_freq(cfg, onenand_base, &clk_dep); |
aa62e90f JY |
200 | first_time = 1; |
201 | } | |
202 | ||
203 | switch (freq) { | |
4931445b AH |
204 | case 104: |
205 | min_gpmc_clk_period = 9600; /* 104 MHz */ | |
206 | t_ces = 3; | |
207 | t_avds = 4; | |
208 | t_avdh = 2; | |
209 | t_ach = 3; | |
210 | t_aavdh = 6; | |
1435ca0f | 211 | t_rdyo = 6; |
4931445b | 212 | break; |
aa62e90f | 213 | case 83: |
a3551f5b | 214 | min_gpmc_clk_period = 12000; /* 83 MHz */ |
aa62e90f JY |
215 | t_ces = 5; |
216 | t_avds = 4; | |
217 | t_avdh = 2; | |
218 | t_ach = 6; | |
219 | t_aavdh = 6; | |
220 | t_rdyo = 9; | |
221 | break; | |
222 | case 66: | |
a3551f5b | 223 | min_gpmc_clk_period = 15000; /* 66 MHz */ |
aa62e90f JY |
224 | t_ces = 6; |
225 | t_avds = 5; | |
226 | t_avdh = 2; | |
227 | t_ach = 6; | |
228 | t_aavdh = 6; | |
229 | t_rdyo = 11; | |
230 | break; | |
231 | default: | |
a3551f5b | 232 | min_gpmc_clk_period = 18500; /* 54 MHz */ |
aa62e90f JY |
233 | t_ces = 7; |
234 | t_avds = 7; | |
235 | t_avdh = 7; | |
236 | t_ach = 9; | |
237 | t_aavdh = 7; | |
238 | t_rdyo = 15; | |
239 | sync_write = 0; | |
240 | break; | |
241 | } | |
242 | ||
aa62e90f JY |
243 | div = gpmc_cs_calc_divider(cs, min_gpmc_clk_period); |
244 | gpmc_clk_ns = gpmc_ticks_to_ns(div); | |
245 | if (gpmc_clk_ns < 15) /* >66Mhz */ | |
246 | hf = 1; | |
1435ca0f AH |
247 | if (gpmc_clk_ns < 12) /* >83Mhz */ |
248 | vhf = 1; | |
249 | if (vhf) | |
250 | latency = 8; | |
251 | else if (hf) | |
aa62e90f JY |
252 | latency = 6; |
253 | else if (gpmc_clk_ns >= 25) /* 40 MHz*/ | |
254 | latency = 3; | |
255 | else | |
256 | latency = 4; | |
257 | ||
5714b7ed AH |
258 | if (clk_dep) { |
259 | if (gpmc_clk_ns < 12) { /* >83Mhz */ | |
260 | t_ces = 3; | |
261 | t_avds = 4; | |
262 | } else if (gpmc_clk_ns < 15) { /* >66Mhz */ | |
263 | t_ces = 5; | |
264 | t_avds = 4; | |
265 | } else if (gpmc_clk_ns < 25) { /* >40Mhz */ | |
266 | t_ces = 6; | |
267 | t_avds = 5; | |
268 | } else { | |
269 | t_ces = 7; | |
270 | t_avds = 7; | |
271 | } | |
272 | } | |
273 | ||
aa62e90f JY |
274 | if (first_time) |
275 | set_onenand_cfg(onenand_base, latency, | |
1435ca0f | 276 | sync_read, sync_write, hf, vhf); |
aa62e90f JY |
277 | |
278 | if (div == 1) { | |
279 | reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG2); | |
280 | reg |= (1 << 7); | |
281 | gpmc_cs_write_reg(cs, GPMC_CS_CONFIG2, reg); | |
282 | reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG3); | |
283 | reg |= (1 << 7); | |
284 | gpmc_cs_write_reg(cs, GPMC_CS_CONFIG3, reg); | |
285 | reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG4); | |
286 | reg |= (1 << 7); | |
287 | reg |= (1 << 23); | |
288 | gpmc_cs_write_reg(cs, GPMC_CS_CONFIG4, reg); | |
289 | } else { | |
290 | reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG2); | |
291 | reg &= ~(1 << 7); | |
292 | gpmc_cs_write_reg(cs, GPMC_CS_CONFIG2, reg); | |
293 | reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG3); | |
294 | reg &= ~(1 << 7); | |
295 | gpmc_cs_write_reg(cs, GPMC_CS_CONFIG3, reg); | |
296 | reg = gpmc_cs_read_reg(cs, GPMC_CS_CONFIG4); | |
297 | reg &= ~(1 << 7); | |
298 | reg &= ~(1 << 23); | |
299 | gpmc_cs_write_reg(cs, GPMC_CS_CONFIG4, reg); | |
300 | } | |
301 | ||
302 | /* Set synchronous read timings */ | |
303 | memset(&t, 0, sizeof(t)); | |
304 | t.sync_clk = min_gpmc_clk_period; | |
305 | t.cs_on = 0; | |
306 | t.adv_on = 0; | |
307 | fclk_offset_ns = gpmc_round_ns_to_ticks(max_t(int, t_ces, t_avds)); | |
308 | fclk_offset = gpmc_ns_to_ticks(fclk_offset_ns); | |
309 | t.page_burst_access = gpmc_clk_ns; | |
310 | ||
311 | /* Read */ | |
312 | t.adv_rd_off = gpmc_ticks_to_ns(fclk_offset + gpmc_ns_to_ticks(t_avdh)); | |
313 | t.oe_on = gpmc_ticks_to_ns(fclk_offset + gpmc_ns_to_ticks(t_ach)); | |
1435ca0f AH |
314 | /* Force at least 1 clk between AVD High to OE Low */ |
315 | if (t.oe_on <= t.adv_rd_off) | |
316 | t.oe_on = t.adv_rd_off + gpmc_round_ns_to_ticks(1); | |
aa62e90f JY |
317 | t.access = gpmc_ticks_to_ns(fclk_offset + (latency + 1) * div); |
318 | t.oe_off = t.access + gpmc_round_ns_to_ticks(1); | |
319 | t.cs_rd_off = t.oe_off; | |
320 | ticks_cez = ((gpmc_ns_to_ticks(t_cez) + div - 1) / div) * div; | |
321 | t.rd_cycle = gpmc_ticks_to_ns(fclk_offset + (latency + 1) * div + | |
322 | ticks_cez); | |
323 | ||
324 | /* Write */ | |
325 | if (sync_write) { | |
326 | t.adv_wr_off = t.adv_rd_off; | |
327 | t.we_on = 0; | |
328 | t.we_off = t.cs_rd_off; | |
329 | t.cs_wr_off = t.cs_rd_off; | |
330 | t.wr_cycle = t.rd_cycle; | |
331 | if (cpu_is_omap34xx()) { | |
332 | t.wr_data_mux_bus = gpmc_ticks_to_ns(fclk_offset + | |
a3551f5b AH |
333 | gpmc_ps_to_ticks(min_gpmc_clk_period + |
334 | t_rdyo * 1000)); | |
aa62e90f JY |
335 | t.wr_access = t.access; |
336 | } | |
337 | } else { | |
338 | t.adv_wr_off = gpmc_round_ns_to_ticks(max_t(int, | |
339 | t_avdp, t_cer)); | |
340 | t.we_on = t.adv_wr_off + gpmc_round_ns_to_ticks(t_aavdh); | |
341 | t.we_off = t.we_on + gpmc_round_ns_to_ticks(t_wpl); | |
342 | t.cs_wr_off = t.we_off + gpmc_round_ns_to_ticks(t_wph); | |
343 | t.wr_cycle = t.cs_wr_off + gpmc_round_ns_to_ticks(t_cez); | |
344 | if (cpu_is_omap34xx()) { | |
345 | t.wr_data_mux_bus = t.we_on; | |
346 | t.wr_access = t.we_on + gpmc_round_ns_to_ticks(t_ds); | |
347 | } | |
348 | } | |
349 | ||
350 | /* Configure GPMC for synchronous read */ | |
351 | gpmc_cs_write_reg(cs, GPMC_CS_CONFIG1, | |
352 | GPMC_CONFIG1_WRAPBURST_SUPP | | |
353 | GPMC_CONFIG1_READMULTIPLE_SUPP | | |
354 | (sync_read ? GPMC_CONFIG1_READTYPE_SYNC : 0) | | |
355 | (sync_write ? GPMC_CONFIG1_WRITEMULTIPLE_SUPP : 0) | | |
356 | (sync_write ? GPMC_CONFIG1_WRITETYPE_SYNC : 0) | | |
357 | GPMC_CONFIG1_CLKACTIVATIONTIME(fclk_offset) | | |
358 | GPMC_CONFIG1_PAGE_LEN(2) | | |
359 | (cpu_is_omap34xx() ? 0 : | |
360 | (GPMC_CONFIG1_WAIT_READ_MON | | |
361 | GPMC_CONFIG1_WAIT_PIN_SEL(0))) | | |
362 | GPMC_CONFIG1_DEVICESIZE_16 | | |
363 | GPMC_CONFIG1_DEVICETYPE_NOR | | |
364 | GPMC_CONFIG1_MUXADDDATA); | |
365 | ||
366 | err = gpmc_cs_set_timings(cs, &t); | |
367 | if (err) | |
368 | return err; | |
369 | ||
1435ca0f | 370 | set_onenand_cfg(onenand_base, latency, sync_read, sync_write, hf, vhf); |
aa62e90f | 371 | |
3ad2d861 AH |
372 | *freq_ptr = freq; |
373 | ||
aa62e90f JY |
374 | return 0; |
375 | } | |
376 | ||
3ad2d861 | 377 | static int gpmc_onenand_setup(void __iomem *onenand_base, int *freq_ptr) |
aa62e90f JY |
378 | { |
379 | struct device *dev = &gpmc_onenand_device.dev; | |
380 | ||
381 | /* Set sync timings in GPMC */ | |
382 | if (omap2_onenand_set_sync_mode(gpmc_onenand_data, onenand_base, | |
3ad2d861 | 383 | freq_ptr) < 0) { |
aa62e90f JY |
384 | dev_err(dev, "Unable to set synchronous mode\n"); |
385 | return -EINVAL; | |
386 | } | |
387 | ||
388 | return 0; | |
389 | } | |
390 | ||
391 | void __init gpmc_onenand_init(struct omap_onenand_platform_data *_onenand_data) | |
392 | { | |
393 | gpmc_onenand_data = _onenand_data; | |
394 | gpmc_onenand_data->onenand_setup = gpmc_onenand_setup; | |
395 | gpmc_onenand_device.dev.platform_data = gpmc_onenand_data; | |
396 | ||
397 | if (cpu_is_omap24xx() && | |
398 | (gpmc_onenand_data->flags & ONENAND_SYNC_READWRITE)) { | |
399 | printk(KERN_ERR "Onenand using only SYNC_READ on 24xx\n"); | |
400 | gpmc_onenand_data->flags &= ~ONENAND_SYNC_READWRITE; | |
401 | gpmc_onenand_data->flags |= ONENAND_SYNC_READ; | |
402 | } | |
403 | ||
404 | if (platform_device_register(&gpmc_onenand_device) < 0) { | |
405 | printk(KERN_ERR "Unable to register OneNAND device\n"); | |
406 | return; | |
407 | } | |
408 | } |