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daeeb438 EP |
1 | /* |
2 | * Synopsys HSDK SDP Generic PLL clock driver | |
3 | * | |
4 | * Copyright (C) 2017 Synopsys | |
5 | * | |
6 | * This file is licensed under the terms of the GNU General Public | |
7 | * License version 2. This program is licensed "as is" without any | |
8 | * warranty of any kind, whether express or implied. | |
9 | */ | |
10 | ||
11 | #include <linux/clk-provider.h> | |
12 | #include <linux/delay.h> | |
13 | #include <linux/device.h> | |
14 | #include <linux/err.h> | |
62e59c4e | 15 | #include <linux/io.h> |
daeeb438 EP |
16 | #include <linux/of.h> |
17 | #include <linux/of_address.h> | |
18 | #include <linux/of_device.h> | |
19 | #include <linux/platform_device.h> | |
20 | #include <linux/slab.h> | |
21 | ||
22 | #define CGU_PLL_CTRL 0x000 /* ARC PLL control register */ | |
23 | #define CGU_PLL_STATUS 0x004 /* ARC PLL status register */ | |
24 | #define CGU_PLL_FMEAS 0x008 /* ARC PLL frequency measurement register */ | |
25 | #define CGU_PLL_MON 0x00C /* ARC PLL monitor register */ | |
26 | ||
27 | #define CGU_PLL_CTRL_ODIV_SHIFT 2 | |
28 | #define CGU_PLL_CTRL_IDIV_SHIFT 4 | |
29 | #define CGU_PLL_CTRL_FBDIV_SHIFT 9 | |
30 | #define CGU_PLL_CTRL_BAND_SHIFT 20 | |
31 | ||
32 | #define CGU_PLL_CTRL_ODIV_MASK GENMASK(3, CGU_PLL_CTRL_ODIV_SHIFT) | |
33 | #define CGU_PLL_CTRL_IDIV_MASK GENMASK(8, CGU_PLL_CTRL_IDIV_SHIFT) | |
34 | #define CGU_PLL_CTRL_FBDIV_MASK GENMASK(15, CGU_PLL_CTRL_FBDIV_SHIFT) | |
35 | ||
36 | #define CGU_PLL_CTRL_PD BIT(0) | |
37 | #define CGU_PLL_CTRL_BYPASS BIT(1) | |
38 | ||
39 | #define CGU_PLL_STATUS_LOCK BIT(0) | |
40 | #define CGU_PLL_STATUS_ERR BIT(1) | |
41 | ||
42 | #define HSDK_PLL_MAX_LOCK_TIME 100 /* 100 us */ | |
43 | ||
44 | #define CGU_PLL_SOURCE_MAX 1 | |
45 | ||
46 | #define CORE_IF_CLK_THRESHOLD_HZ 500000000 | |
47 | #define CREG_CORE_IF_CLK_DIV_1 0x0 | |
48 | #define CREG_CORE_IF_CLK_DIV_2 0x1 | |
49 | ||
50 | struct hsdk_pll_cfg { | |
51 | u32 rate; | |
52 | u32 idiv; | |
53 | u32 fbdiv; | |
54 | u32 odiv; | |
55 | u32 band; | |
56 | }; | |
57 | ||
58 | static const struct hsdk_pll_cfg asdt_pll_cfg[] = { | |
59 | { 100000000, 0, 11, 3, 0 }, | |
60 | { 133000000, 0, 15, 3, 0 }, | |
61 | { 200000000, 1, 47, 3, 0 }, | |
62 | { 233000000, 1, 27, 2, 0 }, | |
63 | { 300000000, 1, 35, 2, 0 }, | |
64 | { 333000000, 1, 39, 2, 0 }, | |
65 | { 400000000, 1, 47, 2, 0 }, | |
66 | { 500000000, 0, 14, 1, 0 }, | |
67 | { 600000000, 0, 17, 1, 0 }, | |
68 | { 700000000, 0, 20, 1, 0 }, | |
69 | { 800000000, 0, 23, 1, 0 }, | |
70 | { 900000000, 1, 26, 0, 0 }, | |
71 | { 1000000000, 1, 29, 0, 0 }, | |
72 | { 1100000000, 1, 32, 0, 0 }, | |
73 | { 1200000000, 1, 35, 0, 0 }, | |
74 | { 1300000000, 1, 38, 0, 0 }, | |
75 | { 1400000000, 1, 41, 0, 0 }, | |
76 | { 1500000000, 1, 44, 0, 0 }, | |
77 | { 1600000000, 1, 47, 0, 0 }, | |
78 | {} | |
79 | }; | |
80 | ||
81 | static const struct hsdk_pll_cfg hdmi_pll_cfg[] = { | |
82 | { 297000000, 0, 21, 2, 0 }, | |
83 | { 540000000, 0, 19, 1, 0 }, | |
84 | { 594000000, 0, 21, 1, 0 }, | |
85 | {} | |
86 | }; | |
87 | ||
88 | struct hsdk_pll_clk { | |
89 | struct clk_hw hw; | |
90 | void __iomem *regs; | |
91 | void __iomem *spec_regs; | |
92 | const struct hsdk_pll_devdata *pll_devdata; | |
93 | struct device *dev; | |
94 | }; | |
95 | ||
96 | struct hsdk_pll_devdata { | |
97 | const struct hsdk_pll_cfg *pll_cfg; | |
98 | int (*update_rate)(struct hsdk_pll_clk *clk, unsigned long rate, | |
99 | const struct hsdk_pll_cfg *cfg); | |
100 | }; | |
101 | ||
102 | static int hsdk_pll_core_update_rate(struct hsdk_pll_clk *, unsigned long, | |
103 | const struct hsdk_pll_cfg *); | |
104 | static int hsdk_pll_comm_update_rate(struct hsdk_pll_clk *, unsigned long, | |
105 | const struct hsdk_pll_cfg *); | |
106 | ||
107 | static const struct hsdk_pll_devdata core_pll_devdata = { | |
108 | .pll_cfg = asdt_pll_cfg, | |
109 | .update_rate = hsdk_pll_core_update_rate, | |
110 | }; | |
111 | ||
112 | static const struct hsdk_pll_devdata sdt_pll_devdata = { | |
113 | .pll_cfg = asdt_pll_cfg, | |
114 | .update_rate = hsdk_pll_comm_update_rate, | |
115 | }; | |
116 | ||
117 | static const struct hsdk_pll_devdata hdmi_pll_devdata = { | |
118 | .pll_cfg = hdmi_pll_cfg, | |
119 | .update_rate = hsdk_pll_comm_update_rate, | |
120 | }; | |
121 | ||
122 | static inline void hsdk_pll_write(struct hsdk_pll_clk *clk, u32 reg, u32 val) | |
123 | { | |
124 | iowrite32(val, clk->regs + reg); | |
125 | } | |
126 | ||
127 | static inline u32 hsdk_pll_read(struct hsdk_pll_clk *clk, u32 reg) | |
128 | { | |
129 | return ioread32(clk->regs + reg); | |
130 | } | |
131 | ||
132 | static inline void hsdk_pll_set_cfg(struct hsdk_pll_clk *clk, | |
133 | const struct hsdk_pll_cfg *cfg) | |
134 | { | |
135 | u32 val = 0; | |
136 | ||
137 | /* Powerdown and Bypass bits should be cleared */ | |
138 | val |= cfg->idiv << CGU_PLL_CTRL_IDIV_SHIFT; | |
139 | val |= cfg->fbdiv << CGU_PLL_CTRL_FBDIV_SHIFT; | |
140 | val |= cfg->odiv << CGU_PLL_CTRL_ODIV_SHIFT; | |
141 | val |= cfg->band << CGU_PLL_CTRL_BAND_SHIFT; | |
142 | ||
658af6cb | 143 | dev_dbg(clk->dev, "write configuration: %#x\n", val); |
daeeb438 EP |
144 | |
145 | hsdk_pll_write(clk, CGU_PLL_CTRL, val); | |
146 | } | |
147 | ||
148 | static inline bool hsdk_pll_is_locked(struct hsdk_pll_clk *clk) | |
149 | { | |
150 | return !!(hsdk_pll_read(clk, CGU_PLL_STATUS) & CGU_PLL_STATUS_LOCK); | |
151 | } | |
152 | ||
153 | static inline bool hsdk_pll_is_err(struct hsdk_pll_clk *clk) | |
154 | { | |
155 | return !!(hsdk_pll_read(clk, CGU_PLL_STATUS) & CGU_PLL_STATUS_ERR); | |
156 | } | |
157 | ||
158 | static inline struct hsdk_pll_clk *to_hsdk_pll_clk(struct clk_hw *hw) | |
159 | { | |
160 | return container_of(hw, struct hsdk_pll_clk, hw); | |
161 | } | |
162 | ||
163 | static unsigned long hsdk_pll_recalc_rate(struct clk_hw *hw, | |
164 | unsigned long parent_rate) | |
165 | { | |
166 | u32 val; | |
167 | u64 rate; | |
168 | u32 idiv, fbdiv, odiv; | |
169 | struct hsdk_pll_clk *clk = to_hsdk_pll_clk(hw); | |
170 | ||
171 | val = hsdk_pll_read(clk, CGU_PLL_CTRL); | |
172 | ||
658af6cb | 173 | dev_dbg(clk->dev, "current configuration: %#x\n", val); |
daeeb438 EP |
174 | |
175 | /* Check if PLL is disabled */ | |
176 | if (val & CGU_PLL_CTRL_PD) | |
177 | return 0; | |
178 | ||
179 | /* Check if PLL is bypassed */ | |
180 | if (val & CGU_PLL_CTRL_BYPASS) | |
181 | return parent_rate; | |
182 | ||
183 | /* input divider = reg.idiv + 1 */ | |
184 | idiv = 1 + ((val & CGU_PLL_CTRL_IDIV_MASK) >> CGU_PLL_CTRL_IDIV_SHIFT); | |
185 | /* fb divider = 2*(reg.fbdiv + 1) */ | |
186 | fbdiv = 2 * (1 + ((val & CGU_PLL_CTRL_FBDIV_MASK) >> CGU_PLL_CTRL_FBDIV_SHIFT)); | |
187 | /* output divider = 2^(reg.odiv) */ | |
188 | odiv = 1 << ((val & CGU_PLL_CTRL_ODIV_MASK) >> CGU_PLL_CTRL_ODIV_SHIFT); | |
189 | ||
190 | rate = (u64)parent_rate * fbdiv; | |
191 | do_div(rate, idiv * odiv); | |
192 | ||
193 | return rate; | |
194 | } | |
195 | ||
196 | static long hsdk_pll_round_rate(struct clk_hw *hw, unsigned long rate, | |
197 | unsigned long *prate) | |
198 | { | |
199 | int i; | |
200 | unsigned long best_rate; | |
201 | struct hsdk_pll_clk *clk = to_hsdk_pll_clk(hw); | |
202 | const struct hsdk_pll_cfg *pll_cfg = clk->pll_devdata->pll_cfg; | |
203 | ||
204 | if (pll_cfg[0].rate == 0) | |
205 | return -EINVAL; | |
206 | ||
207 | best_rate = pll_cfg[0].rate; | |
208 | ||
209 | for (i = 1; pll_cfg[i].rate != 0; i++) { | |
210 | if (abs(rate - pll_cfg[i].rate) < abs(rate - best_rate)) | |
211 | best_rate = pll_cfg[i].rate; | |
212 | } | |
213 | ||
214 | dev_dbg(clk->dev, "chosen best rate: %lu\n", best_rate); | |
215 | ||
216 | return best_rate; | |
217 | } | |
218 | ||
219 | static int hsdk_pll_comm_update_rate(struct hsdk_pll_clk *clk, | |
220 | unsigned long rate, | |
221 | const struct hsdk_pll_cfg *cfg) | |
222 | { | |
223 | hsdk_pll_set_cfg(clk, cfg); | |
224 | ||
225 | /* | |
226 | * Wait until CGU relocks and check error status. | |
227 | * If after timeout CGU is unlocked yet return error. | |
228 | */ | |
229 | udelay(HSDK_PLL_MAX_LOCK_TIME); | |
230 | if (!hsdk_pll_is_locked(clk)) | |
231 | return -ETIMEDOUT; | |
232 | ||
233 | if (hsdk_pll_is_err(clk)) | |
234 | return -EINVAL; | |
235 | ||
236 | return 0; | |
237 | } | |
238 | ||
239 | static int hsdk_pll_core_update_rate(struct hsdk_pll_clk *clk, | |
240 | unsigned long rate, | |
241 | const struct hsdk_pll_cfg *cfg) | |
242 | { | |
243 | /* | |
244 | * When core clock exceeds 500MHz, the divider for the interface | |
245 | * clock must be programmed to div-by-2. | |
246 | */ | |
247 | if (rate > CORE_IF_CLK_THRESHOLD_HZ) | |
248 | iowrite32(CREG_CORE_IF_CLK_DIV_2, clk->spec_regs); | |
249 | ||
250 | hsdk_pll_set_cfg(clk, cfg); | |
251 | ||
252 | /* | |
253 | * Wait until CGU relocks and check error status. | |
254 | * If after timeout CGU is unlocked yet return error. | |
255 | */ | |
256 | udelay(HSDK_PLL_MAX_LOCK_TIME); | |
257 | if (!hsdk_pll_is_locked(clk)) | |
258 | return -ETIMEDOUT; | |
259 | ||
260 | if (hsdk_pll_is_err(clk)) | |
261 | return -EINVAL; | |
262 | ||
263 | /* | |
264 | * Program divider to div-by-1 if we succesfuly set core clock below | |
265 | * 500MHz threshold. | |
266 | */ | |
267 | if (rate <= CORE_IF_CLK_THRESHOLD_HZ) | |
268 | iowrite32(CREG_CORE_IF_CLK_DIV_1, clk->spec_regs); | |
269 | ||
270 | return 0; | |
271 | } | |
272 | ||
273 | static int hsdk_pll_set_rate(struct clk_hw *hw, unsigned long rate, | |
274 | unsigned long parent_rate) | |
275 | { | |
276 | int i; | |
277 | struct hsdk_pll_clk *clk = to_hsdk_pll_clk(hw); | |
278 | const struct hsdk_pll_cfg *pll_cfg = clk->pll_devdata->pll_cfg; | |
279 | ||
280 | for (i = 0; pll_cfg[i].rate != 0; i++) { | |
281 | if (pll_cfg[i].rate == rate) { | |
282 | return clk->pll_devdata->update_rate(clk, rate, | |
283 | &pll_cfg[i]); | |
284 | } | |
285 | } | |
286 | ||
287 | dev_err(clk->dev, "invalid rate=%ld, parent_rate=%ld\n", rate, | |
288 | parent_rate); | |
289 | ||
290 | return -EINVAL; | |
291 | } | |
292 | ||
293 | static const struct clk_ops hsdk_pll_ops = { | |
294 | .recalc_rate = hsdk_pll_recalc_rate, | |
295 | .round_rate = hsdk_pll_round_rate, | |
296 | .set_rate = hsdk_pll_set_rate, | |
297 | }; | |
298 | ||
299 | static int hsdk_pll_clk_probe(struct platform_device *pdev) | |
300 | { | |
301 | int ret; | |
302 | struct resource *mem; | |
303 | const char *parent_name; | |
304 | unsigned int num_parents; | |
305 | struct hsdk_pll_clk *pll_clk; | |
306 | struct clk_init_data init = { }; | |
307 | struct device *dev = &pdev->dev; | |
308 | ||
309 | pll_clk = devm_kzalloc(dev, sizeof(*pll_clk), GFP_KERNEL); | |
310 | if (!pll_clk) | |
311 | return -ENOMEM; | |
312 | ||
313 | mem = platform_get_resource(pdev, IORESOURCE_MEM, 0); | |
314 | pll_clk->regs = devm_ioremap_resource(dev, mem); | |
315 | if (IS_ERR(pll_clk->regs)) | |
316 | return PTR_ERR(pll_clk->regs); | |
317 | ||
318 | init.name = dev->of_node->name; | |
319 | init.ops = &hsdk_pll_ops; | |
320 | parent_name = of_clk_get_parent_name(dev->of_node, 0); | |
321 | init.parent_names = &parent_name; | |
322 | num_parents = of_clk_get_parent_count(dev->of_node); | |
323 | if (num_parents == 0 || num_parents > CGU_PLL_SOURCE_MAX) { | |
324 | dev_err(dev, "wrong clock parents number: %u\n", num_parents); | |
325 | return -EINVAL; | |
326 | } | |
327 | init.num_parents = num_parents; | |
328 | ||
329 | pll_clk->hw.init = &init; | |
330 | pll_clk->dev = dev; | |
331 | pll_clk->pll_devdata = of_device_get_match_data(dev); | |
332 | ||
333 | if (!pll_clk->pll_devdata) { | |
334 | dev_err(dev, "No OF match data provided\n"); | |
335 | return -EINVAL; | |
336 | } | |
337 | ||
338 | ret = devm_clk_hw_register(dev, &pll_clk->hw); | |
339 | if (ret) { | |
340 | dev_err(dev, "failed to register %s clock\n", init.name); | |
341 | return ret; | |
342 | } | |
343 | ||
344 | return of_clk_add_hw_provider(dev->of_node, of_clk_hw_simple_get, | |
345 | &pll_clk->hw); | |
346 | } | |
347 | ||
348 | static int hsdk_pll_clk_remove(struct platform_device *pdev) | |
349 | { | |
350 | of_clk_del_provider(pdev->dev.of_node); | |
351 | return 0; | |
352 | } | |
353 | ||
354 | static void __init of_hsdk_pll_clk_setup(struct device_node *node) | |
355 | { | |
356 | int ret; | |
357 | const char *parent_name; | |
358 | unsigned int num_parents; | |
359 | struct hsdk_pll_clk *pll_clk; | |
360 | struct clk_init_data init = { }; | |
361 | ||
362 | pll_clk = kzalloc(sizeof(*pll_clk), GFP_KERNEL); | |
363 | if (!pll_clk) | |
364 | return; | |
365 | ||
366 | pll_clk->regs = of_iomap(node, 0); | |
367 | if (!pll_clk->regs) { | |
368 | pr_err("failed to map pll registers\n"); | |
369 | goto err_free_pll_clk; | |
370 | } | |
371 | ||
372 | pll_clk->spec_regs = of_iomap(node, 1); | |
373 | if (!pll_clk->spec_regs) { | |
374 | pr_err("failed to map pll registers\n"); | |
375 | goto err_unmap_comm_regs; | |
376 | } | |
377 | ||
378 | init.name = node->name; | |
379 | init.ops = &hsdk_pll_ops; | |
380 | parent_name = of_clk_get_parent_name(node, 0); | |
381 | init.parent_names = &parent_name; | |
382 | num_parents = of_clk_get_parent_count(node); | |
383 | if (num_parents > CGU_PLL_SOURCE_MAX) { | |
384 | pr_err("too much clock parents: %u\n", num_parents); | |
385 | goto err_unmap_spec_regs; | |
386 | } | |
387 | init.num_parents = num_parents; | |
388 | ||
389 | pll_clk->hw.init = &init; | |
390 | pll_clk->pll_devdata = &core_pll_devdata; | |
391 | ||
392 | ret = clk_hw_register(NULL, &pll_clk->hw); | |
393 | if (ret) { | |
e665f029 | 394 | pr_err("failed to register %pOFn clock\n", node); |
daeeb438 EP |
395 | goto err_unmap_spec_regs; |
396 | } | |
397 | ||
398 | ret = of_clk_add_hw_provider(node, of_clk_hw_simple_get, &pll_clk->hw); | |
399 | if (ret) { | |
e665f029 | 400 | pr_err("failed to add hw provider for %pOFn clock\n", node); |
daeeb438 EP |
401 | goto err_unmap_spec_regs; |
402 | } | |
403 | ||
404 | return; | |
405 | ||
406 | err_unmap_spec_regs: | |
407 | iounmap(pll_clk->spec_regs); | |
408 | err_unmap_comm_regs: | |
409 | iounmap(pll_clk->regs); | |
410 | err_free_pll_clk: | |
411 | kfree(pll_clk); | |
412 | } | |
413 | ||
414 | /* Core PLL needed early for ARC cpus timers */ | |
415 | CLK_OF_DECLARE(hsdk_pll_clock, "snps,hsdk-core-pll-clock", | |
416 | of_hsdk_pll_clk_setup); | |
417 | ||
418 | static const struct of_device_id hsdk_pll_clk_id[] = { | |
419 | { .compatible = "snps,hsdk-gp-pll-clock", .data = &sdt_pll_devdata}, | |
420 | { .compatible = "snps,hsdk-hdmi-pll-clock", .data = &hdmi_pll_devdata}, | |
421 | { } | |
422 | }; | |
423 | ||
424 | static struct platform_driver hsdk_pll_clk_driver = { | |
425 | .driver = { | |
426 | .name = "hsdk-gp-pll-clock", | |
427 | .of_match_table = hsdk_pll_clk_id, | |
428 | }, | |
429 | .probe = hsdk_pll_clk_probe, | |
430 | .remove = hsdk_pll_clk_remove, | |
431 | }; | |
432 | builtin_platform_driver(hsdk_pll_clk_driver); |