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96900315 SM |
1 | #include <linux/module.h> |
2 | #include <linux/kernel.h> | |
3 | #include <linux/list.h> | |
4 | #include <linux/errno.h> | |
5 | #include <linux/err.h> | |
6 | #include <linux/string.h> | |
7 | #include <linux/clk.h> | |
8 | #include <linux/mutex.h> | |
9 | #include <linux/spinlock.h> | |
10 | #include <linux/debugfs.h> | |
11 | #include <linux/device.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/timer.h> | |
14 | #include <linux/io.h> | |
15 | #include <linux/seq_file.h> | |
16 | #include <linux/clkdev.h> | |
17 | ||
18 | #include <asm/clocks.h> | |
19 | ||
20 | #define CGU0_CTL_DF (1 << 0) | |
21 | ||
22 | #define CGU0_CTL_MSEL_SHIFT 8 | |
23 | #define CGU0_CTL_MSEL_MASK (0x7f << 8) | |
24 | ||
25 | #define CGU0_STAT_PLLEN (1 << 0) | |
26 | #define CGU0_STAT_PLLBP (1 << 1) | |
27 | #define CGU0_STAT_PLLLK (1 << 2) | |
28 | #define CGU0_STAT_CLKSALGN (1 << 3) | |
29 | #define CGU0_STAT_CCBF0 (1 << 4) | |
30 | #define CGU0_STAT_CCBF1 (1 << 5) | |
31 | #define CGU0_STAT_SCBF0 (1 << 6) | |
32 | #define CGU0_STAT_SCBF1 (1 << 7) | |
33 | #define CGU0_STAT_DCBF (1 << 8) | |
34 | #define CGU0_STAT_OCBF (1 << 9) | |
35 | #define CGU0_STAT_ADDRERR (1 << 16) | |
36 | #define CGU0_STAT_LWERR (1 << 17) | |
37 | #define CGU0_STAT_DIVERR (1 << 18) | |
38 | #define CGU0_STAT_WDFMSERR (1 << 19) | |
39 | #define CGU0_STAT_WDIVERR (1 << 20) | |
40 | #define CGU0_STAT_PLOCKERR (1 << 21) | |
41 | ||
42 | #define CGU0_DIV_CSEL_SHIFT 0 | |
43 | #define CGU0_DIV_CSEL_MASK 0x0000001F | |
44 | #define CGU0_DIV_S0SEL_SHIFT 5 | |
45 | #define CGU0_DIV_S0SEL_MASK (0x3 << CGU0_DIV_S0SEL_SHIFT) | |
46 | #define CGU0_DIV_SYSSEL_SHIFT 8 | |
47 | #define CGU0_DIV_SYSSEL_MASK (0x1f << CGU0_DIV_SYSSEL_SHIFT) | |
48 | #define CGU0_DIV_S1SEL_SHIFT 13 | |
49 | #define CGU0_DIV_S1SEL_MASK (0x3 << CGU0_DIV_S1SEL_SHIFT) | |
50 | #define CGU0_DIV_DSEL_SHIFT 16 | |
51 | #define CGU0_DIV_DSEL_MASK (0x1f << CGU0_DIV_DSEL_SHIFT) | |
52 | #define CGU0_DIV_OSEL_SHIFT 22 | |
53 | #define CGU0_DIV_OSEL_MASK (0x7f << CGU0_DIV_OSEL_SHIFT) | |
54 | ||
55 | #define CLK(_clk, _devname, _conname) \ | |
56 | { \ | |
57 | .clk = &_clk, \ | |
58 | .dev_id = _devname, \ | |
59 | .con_id = _conname, \ | |
60 | } | |
61 | ||
62 | #define NEEDS_INITIALIZATION 0x11 | |
63 | ||
64 | static LIST_HEAD(clk_list); | |
65 | ||
66 | static void clk_reg_write_mask(u32 reg, uint32_t val, uint32_t mask) | |
67 | { | |
68 | u32 val2; | |
69 | ||
70 | val2 = bfin_read32(reg); | |
71 | val2 &= ~mask; | |
72 | val2 |= val; | |
73 | bfin_write32(reg, val2); | |
74 | } | |
75 | ||
76 | static void clk_reg_set_bits(u32 reg, uint32_t mask) | |
77 | { | |
78 | u32 val; | |
79 | ||
80 | val = bfin_read32(reg); | |
81 | val |= mask; | |
82 | bfin_write32(reg, val); | |
83 | } | |
84 | ||
85 | static void clk_reg_clear_bits(u32 reg, uint32_t mask) | |
86 | { | |
87 | u32 val; | |
88 | ||
89 | val = bfin_read32(reg); | |
90 | val &= ~mask; | |
91 | bfin_write32(reg, val); | |
92 | } | |
93 | ||
94 | int wait_for_pll_align(void) | |
95 | { | |
96 | int i = 10000; | |
97 | while (i-- && (bfin_read32(CGU0_STAT) & CGU0_STAT_CLKSALGN)); | |
98 | ||
99 | if (bfin_read32(CGU0_STAT) & CGU0_STAT_CLKSALGN) { | |
97929003 | 100 | printk(KERN_CRIT "fail to align clk\n"); |
96900315 SM |
101 | return -1; |
102 | } | |
97929003 | 103 | |
96900315 SM |
104 | return 0; |
105 | } | |
106 | ||
107 | int clk_enable(struct clk *clk) | |
108 | { | |
109 | int ret = -EIO; | |
110 | if (clk->ops && clk->ops->enable) | |
111 | ret = clk->ops->enable(clk); | |
112 | return ret; | |
113 | } | |
114 | EXPORT_SYMBOL(clk_enable); | |
115 | ||
116 | void clk_disable(struct clk *clk) | |
117 | { | |
118 | if (clk->ops && clk->ops->disable) | |
119 | clk->ops->disable(clk); | |
120 | } | |
121 | EXPORT_SYMBOL(clk_disable); | |
122 | ||
123 | unsigned long clk_get_rate(struct clk *clk) | |
124 | { | |
125 | unsigned long ret = 0; | |
126 | if (clk->ops && clk->ops->get_rate) | |
127 | ret = clk->ops->get_rate(clk); | |
128 | return ret; | |
129 | } | |
130 | EXPORT_SYMBOL(clk_get_rate); | |
131 | ||
132 | long clk_round_rate(struct clk *clk, unsigned long rate) | |
133 | { | |
134 | long ret = -EIO; | |
135 | if (clk->ops && clk->ops->round_rate) | |
136 | ret = clk->ops->round_rate(clk, rate); | |
137 | return ret; | |
138 | } | |
139 | EXPORT_SYMBOL(clk_round_rate); | |
140 | ||
141 | int clk_set_rate(struct clk *clk, unsigned long rate) | |
142 | { | |
143 | int ret = -EIO; | |
144 | if (clk->ops && clk->ops->set_rate) | |
145 | ret = clk->ops->set_rate(clk, rate); | |
146 | return ret; | |
147 | } | |
148 | EXPORT_SYMBOL(clk_set_rate); | |
149 | ||
150 | unsigned long vco_get_rate(struct clk *clk) | |
151 | { | |
152 | return clk->rate; | |
153 | } | |
154 | ||
155 | unsigned long pll_get_rate(struct clk *clk) | |
156 | { | |
157 | u32 df; | |
158 | u32 msel; | |
159 | u32 ctl = bfin_read32(CGU0_CTL); | |
160 | u32 stat = bfin_read32(CGU0_STAT); | |
161 | if (stat & CGU0_STAT_PLLBP) | |
162 | return 0; | |
163 | msel = (ctl & CGU0_CTL_MSEL_MASK) >> CGU0_CTL_MSEL_SHIFT; | |
164 | df = (ctl & CGU0_CTL_DF); | |
165 | clk->parent->rate = clk_get_rate(clk->parent); | |
166 | return clk->parent->rate / (df + 1) * msel * 2; | |
167 | } | |
168 | ||
169 | unsigned long pll_round_rate(struct clk *clk, unsigned long rate) | |
170 | { | |
171 | u32 div; | |
172 | div = rate / clk->parent->rate; | |
173 | return clk->parent->rate * div; | |
174 | } | |
175 | ||
176 | int pll_set_rate(struct clk *clk, unsigned long rate) | |
177 | { | |
178 | u32 msel; | |
179 | u32 stat = bfin_read32(CGU0_STAT); | |
180 | if (!(stat & CGU0_STAT_PLLEN)) | |
181 | return -EBUSY; | |
182 | if (!(stat & CGU0_STAT_PLLLK)) | |
183 | return -EBUSY; | |
184 | if (wait_for_pll_align()) | |
185 | return -EBUSY; | |
186 | msel = rate / clk->parent->rate / 2; | |
187 | clk_reg_write_mask(CGU0_CTL, msel << CGU0_CTL_MSEL_SHIFT, | |
188 | CGU0_CTL_MSEL_MASK); | |
189 | clk->rate = rate; | |
190 | return 0; | |
191 | } | |
192 | ||
193 | unsigned long cclk_get_rate(struct clk *clk) | |
194 | { | |
195 | if (clk->parent) | |
196 | return clk->parent->rate; | |
197 | else | |
198 | return 0; | |
199 | } | |
200 | ||
201 | unsigned long sys_clk_get_rate(struct clk *clk) | |
202 | { | |
203 | unsigned long drate; | |
204 | u32 msel; | |
205 | u32 df; | |
206 | u32 ctl = bfin_read32(CGU0_CTL); | |
207 | u32 div = bfin_read32(CGU0_DIV); | |
208 | div = (div & clk->mask) >> clk->shift; | |
209 | msel = (ctl & CGU0_CTL_MSEL_MASK) >> CGU0_CTL_MSEL_SHIFT; | |
210 | df = (ctl & CGU0_CTL_DF); | |
211 | ||
212 | if (!strcmp(clk->parent->name, "SYS_CLKIN")) { | |
213 | drate = clk->parent->rate / (df + 1); | |
214 | drate *= msel; | |
215 | drate /= div; | |
216 | return drate; | |
217 | } else { | |
218 | clk->parent->rate = clk_get_rate(clk->parent); | |
219 | return clk->parent->rate / div; | |
220 | } | |
221 | } | |
222 | ||
223 | unsigned long sys_clk_round_rate(struct clk *clk, unsigned long rate) | |
224 | { | |
225 | unsigned long max_rate; | |
226 | unsigned long drate; | |
227 | int i; | |
228 | u32 msel; | |
229 | u32 df; | |
230 | u32 ctl = bfin_read32(CGU0_CTL); | |
231 | ||
232 | msel = (ctl & CGU0_CTL_MSEL_MASK) >> CGU0_CTL_MSEL_SHIFT; | |
233 | df = (ctl & CGU0_CTL_DF); | |
234 | max_rate = clk->parent->rate / (df + 1) * msel; | |
235 | ||
236 | if (rate > max_rate) | |
237 | return 0; | |
238 | ||
239 | for (i = 1; i < clk->mask; i++) { | |
240 | drate = max_rate / i; | |
241 | if (rate >= drate) | |
242 | return drate; | |
243 | } | |
244 | return 0; | |
245 | } | |
246 | ||
247 | int sys_clk_set_rate(struct clk *clk, unsigned long rate) | |
248 | { | |
249 | u32 div = bfin_read32(CGU0_DIV); | |
250 | div = (div & clk->mask) >> clk->shift; | |
251 | ||
252 | rate = clk_round_rate(clk, rate); | |
253 | ||
254 | if (!rate) | |
255 | return -EINVAL; | |
256 | ||
257 | div = (clk_get_rate(clk) * div) / rate; | |
258 | ||
259 | if (wait_for_pll_align()) | |
260 | return -EBUSY; | |
261 | clk_reg_write_mask(CGU0_DIV, div << clk->shift, | |
262 | clk->mask); | |
263 | clk->rate = rate; | |
264 | return 0; | |
265 | } | |
266 | ||
267 | static struct clk_ops vco_ops = { | |
268 | .get_rate = vco_get_rate, | |
269 | }; | |
270 | ||
271 | static struct clk_ops pll_ops = { | |
272 | .get_rate = pll_get_rate, | |
273 | .set_rate = pll_set_rate, | |
274 | }; | |
275 | ||
276 | static struct clk_ops cclk_ops = { | |
277 | .get_rate = cclk_get_rate, | |
278 | }; | |
279 | ||
280 | static struct clk_ops sys_clk_ops = { | |
281 | .get_rate = sys_clk_get_rate, | |
282 | .set_rate = sys_clk_set_rate, | |
283 | .round_rate = sys_clk_round_rate, | |
284 | }; | |
285 | ||
286 | static struct clk sys_clkin = { | |
287 | .name = "SYS_CLKIN", | |
288 | .rate = CONFIG_CLKIN_HZ, | |
289 | .ops = &vco_ops, | |
290 | }; | |
291 | ||
292 | static struct clk pll_clk = { | |
293 | .name = "PLLCLK", | |
294 | .rate = 500000000, | |
295 | .parent = &sys_clkin, | |
296 | .ops = &pll_ops, | |
297 | .flags = NEEDS_INITIALIZATION, | |
298 | }; | |
299 | ||
300 | static struct clk cclk = { | |
301 | .name = "CCLK", | |
302 | .rate = 500000000, | |
303 | .mask = CGU0_DIV_CSEL_MASK, | |
304 | .shift = CGU0_DIV_CSEL_SHIFT, | |
305 | .parent = &sys_clkin, | |
306 | .ops = &sys_clk_ops, | |
307 | .flags = NEEDS_INITIALIZATION, | |
308 | }; | |
309 | ||
310 | static struct clk cclk0 = { | |
311 | .name = "CCLK0", | |
312 | .parent = &cclk, | |
313 | .ops = &cclk_ops, | |
314 | }; | |
315 | ||
316 | static struct clk cclk1 = { | |
317 | .name = "CCLK1", | |
318 | .parent = &cclk, | |
319 | .ops = &cclk_ops, | |
320 | }; | |
321 | ||
322 | static struct clk sysclk = { | |
323 | .name = "SYSCLK", | |
324 | .rate = 500000000, | |
325 | .mask = CGU0_DIV_SYSSEL_MASK, | |
326 | .shift = CGU0_DIV_SYSSEL_SHIFT, | |
327 | .parent = &sys_clkin, | |
328 | .ops = &sys_clk_ops, | |
329 | .flags = NEEDS_INITIALIZATION, | |
330 | }; | |
331 | ||
332 | static struct clk sclk0 = { | |
333 | .name = "SCLK0", | |
334 | .rate = 500000000, | |
335 | .mask = CGU0_DIV_S0SEL_MASK, | |
336 | .shift = CGU0_DIV_S0SEL_SHIFT, | |
337 | .parent = &sysclk, | |
338 | .ops = &sys_clk_ops, | |
339 | }; | |
340 | ||
341 | static struct clk sclk1 = { | |
342 | .name = "SCLK1", | |
343 | .rate = 500000000, | |
344 | .mask = CGU0_DIV_S1SEL_MASK, | |
345 | .shift = CGU0_DIV_S1SEL_SHIFT, | |
346 | .parent = &sysclk, | |
347 | .ops = &sys_clk_ops, | |
348 | }; | |
349 | ||
350 | static struct clk dclk = { | |
351 | .name = "DCLK", | |
352 | .rate = 500000000, | |
353 | .mask = CGU0_DIV_DSEL_MASK, | |
354 | .shift = CGU0_DIV_DSEL_SHIFT, | |
7c141c1c | 355 | .parent = &sys_clkin, |
96900315 SM |
356 | .ops = &sys_clk_ops, |
357 | }; | |
358 | ||
359 | static struct clk oclk = { | |
360 | .name = "OCLK", | |
361 | .rate = 500000000, | |
362 | .mask = CGU0_DIV_OSEL_MASK, | |
363 | .shift = CGU0_DIV_OSEL_SHIFT, | |
364 | .parent = &pll_clk, | |
365 | }; | |
366 | ||
367 | static struct clk_lookup bf609_clks[] = { | |
368 | CLK(sys_clkin, NULL, "SYS_CLKIN"), | |
369 | CLK(pll_clk, NULL, "PLLCLK"), | |
370 | CLK(cclk, NULL, "CCLK"), | |
371 | CLK(cclk0, NULL, "CCLK0"), | |
372 | CLK(cclk1, NULL, "CCLK1"), | |
373 | CLK(sysclk, NULL, "SYSCLK"), | |
374 | CLK(sclk0, NULL, "SCLK0"), | |
375 | CLK(sclk1, NULL, "SCLK1"), | |
376 | CLK(dclk, NULL, "DCLK"), | |
377 | CLK(oclk, NULL, "OCLK"), | |
378 | }; | |
379 | ||
380 | int __init clk_init(void) | |
381 | { | |
382 | int i; | |
383 | struct clk *clkp; | |
384 | for (i = 0; i < ARRAY_SIZE(bf609_clks); i++) { | |
385 | clkp = bf609_clks[i].clk; | |
386 | if (clkp->flags & NEEDS_INITIALIZATION) | |
387 | clk_get_rate(clkp); | |
388 | } | |
389 | clkdev_add_table(bf609_clks, ARRAY_SIZE(bf609_clks)); | |
390 | return 0; | |
391 | } |