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WIP FPC-III support
[linux/fpc-iii.git] / drivers / clk / nxp / clk-lpc18xx-cgu.c
blob8b686da5577b3b8038b0507d8075551cab48c5fc
1 /*
2 * Clk driver for NXP LPC18xx/LPC43xx Clock Generation Unit (CGU)
3 *
4 * Copyright (C) 2015 Joachim Eastwood <manabian@gmail.com>
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/io.h>
14 #include <linux/kernel.h>
15 #include <linux/of.h>
16 #include <linux/of_address.h>
17
18 #include <dt-bindings/clock/lpc18xx-cgu.h>
19
20 /* Clock Generation Unit (CGU) registers */
21 #define LPC18XX_CGU_XTAL_OSC_CTRL 0x018
22 #define LPC18XX_CGU_PLL0USB_STAT 0x01c
23 #define LPC18XX_CGU_PLL0USB_CTRL 0x020
24 #define LPC18XX_CGU_PLL0USB_MDIV 0x024
25 #define LPC18XX_CGU_PLL0USB_NP_DIV 0x028
26 #define LPC18XX_CGU_PLL0AUDIO_STAT 0x02c
27 #define LPC18XX_CGU_PLL0AUDIO_CTRL 0x030
28 #define LPC18XX_CGU_PLL0AUDIO_MDIV 0x034
29 #define LPC18XX_CGU_PLL0AUDIO_NP_DIV 0x038
30 #define LPC18XX_CGU_PLL0AUDIO_FRAC 0x03c
31 #define LPC18XX_CGU_PLL1_STAT 0x040
32 #define LPC18XX_CGU_PLL1_CTRL 0x044
33 #define LPC18XX_PLL1_CTRL_FBSEL BIT(6)
34 #define LPC18XX_PLL1_CTRL_DIRECT BIT(7)
35 #define LPC18XX_CGU_IDIV_CTRL(n) (0x048 + (n) * sizeof(u32))
36 #define LPC18XX_CGU_BASE_CLK(id) (0x05c + (id) * sizeof(u32))
37 #define LPC18XX_CGU_PLL_CTRL_OFFSET 0x4
38
39 /* PLL0 bits common to both audio and USB PLL */
40 #define LPC18XX_PLL0_STAT_LOCK BIT(0)
41 #define LPC18XX_PLL0_CTRL_PD BIT(0)
42 #define LPC18XX_PLL0_CTRL_BYPASS BIT(1)
43 #define LPC18XX_PLL0_CTRL_DIRECTI BIT(2)
44 #define LPC18XX_PLL0_CTRL_DIRECTO BIT(3)
45 #define LPC18XX_PLL0_CTRL_CLKEN BIT(4)
46 #define LPC18XX_PLL0_MDIV_MDEC_MASK 0x1ffff
47 #define LPC18XX_PLL0_MDIV_SELP_SHIFT 17
48 #define LPC18XX_PLL0_MDIV_SELI_SHIFT 22
49 #define LPC18XX_PLL0_MSEL_MAX BIT(15)
50
51 /* Register value that gives PLL0 post/pre dividers equal to 1 */
52 #define LPC18XX_PLL0_NP_DIVS_1 0x00302062
53
54 enum {
55 CLK_SRC_OSC32,
56 CLK_SRC_IRC,
57 CLK_SRC_ENET_RX_CLK,
58 CLK_SRC_ENET_TX_CLK,
59 CLK_SRC_GP_CLKIN,
60 CLK_SRC_RESERVED1,
61 CLK_SRC_OSC,
62 CLK_SRC_PLL0USB,
63 CLK_SRC_PLL0AUDIO,
64 CLK_SRC_PLL1,
65 CLK_SRC_RESERVED2,
66 CLK_SRC_RESERVED3,
67 CLK_SRC_IDIVA,
68 CLK_SRC_IDIVB,
69 CLK_SRC_IDIVC,
70 CLK_SRC_IDIVD,
71 CLK_SRC_IDIVE,
72 CLK_SRC_MAX
73 };
74
75 static const char *clk_src_names[CLK_SRC_MAX] = {
76 [CLK_SRC_OSC32] = "osc32",
77 [CLK_SRC_IRC] = "irc",
78 [CLK_SRC_ENET_RX_CLK] = "enet_rx_clk",
79 [CLK_SRC_ENET_TX_CLK] = "enet_tx_clk",
80 [CLK_SRC_GP_CLKIN] = "gp_clkin",
81 [CLK_SRC_OSC] = "osc",
82 [CLK_SRC_PLL0USB] = "pll0usb",
83 [CLK_SRC_PLL0AUDIO] = "pll0audio",
84 [CLK_SRC_PLL1] = "pll1",
85 [CLK_SRC_IDIVA] = "idiva",
86 [CLK_SRC_IDIVB] = "idivb",
87 [CLK_SRC_IDIVC] = "idivc",
88 [CLK_SRC_IDIVD] = "idivd",
89 [CLK_SRC_IDIVE] = "idive",
90 };
91
92 static const char *clk_base_names[BASE_CLK_MAX] = {
93 [BASE_SAFE_CLK] = "base_safe_clk",
94 [BASE_USB0_CLK] = "base_usb0_clk",
95 [BASE_PERIPH_CLK] = "base_periph_clk",
96 [BASE_USB1_CLK] = "base_usb1_clk",
97 [BASE_CPU_CLK] = "base_cpu_clk",
98 [BASE_SPIFI_CLK] = "base_spifi_clk",
99 [BASE_SPI_CLK] = "base_spi_clk",
100 [BASE_PHY_RX_CLK] = "base_phy_rx_clk",
101 [BASE_PHY_TX_CLK] = "base_phy_tx_clk",
102 [BASE_APB1_CLK] = "base_apb1_clk",
103 [BASE_APB3_CLK] = "base_apb3_clk",
104 [BASE_LCD_CLK] = "base_lcd_clk",
105 [BASE_ADCHS_CLK] = "base_adchs_clk",
106 [BASE_SDIO_CLK] = "base_sdio_clk",
107 [BASE_SSP0_CLK] = "base_ssp0_clk",
108 [BASE_SSP1_CLK] = "base_ssp1_clk",
109 [BASE_UART0_CLK] = "base_uart0_clk",
110 [BASE_UART1_CLK] = "base_uart1_clk",
111 [BASE_UART2_CLK] = "base_uart2_clk",
112 [BASE_UART3_CLK] = "base_uart3_clk",
113 [BASE_OUT_CLK] = "base_out_clk",
114 [BASE_AUDIO_CLK] = "base_audio_clk",
115 [BASE_CGU_OUT0_CLK] = "base_cgu_out0_clk",
116 [BASE_CGU_OUT1_CLK] = "base_cgu_out1_clk",
117 };
118
119 static u32 lpc18xx_cgu_pll0_src_ids[] = {
120 CLK_SRC_OSC32, CLK_SRC_IRC, CLK_SRC_ENET_RX_CLK,
121 CLK_SRC_ENET_TX_CLK, CLK_SRC_GP_CLKIN, CLK_SRC_OSC,
122 CLK_SRC_PLL1, CLK_SRC_IDIVA, CLK_SRC_IDIVB, CLK_SRC_IDIVC,
123 CLK_SRC_IDIVD, CLK_SRC_IDIVE,
124 };
125
126 static u32 lpc18xx_cgu_pll1_src_ids[] = {
127 CLK_SRC_OSC32, CLK_SRC_IRC, CLK_SRC_ENET_RX_CLK,
128 CLK_SRC_ENET_TX_CLK, CLK_SRC_GP_CLKIN, CLK_SRC_OSC,
129 CLK_SRC_PLL0USB, CLK_SRC_PLL0AUDIO, CLK_SRC_IDIVA,
130 CLK_SRC_IDIVB, CLK_SRC_IDIVC, CLK_SRC_IDIVD, CLK_SRC_IDIVE,
131 };
132
133 static u32 lpc18xx_cgu_idiva_src_ids[] = {
134 CLK_SRC_OSC32, CLK_SRC_IRC, CLK_SRC_ENET_RX_CLK,
135 CLK_SRC_ENET_TX_CLK, CLK_SRC_GP_CLKIN, CLK_SRC_OSC,
136 CLK_SRC_PLL0USB, CLK_SRC_PLL0AUDIO, CLK_SRC_PLL1
137 };
138
139 static u32 lpc18xx_cgu_idivbcde_src_ids[] = {
140 CLK_SRC_OSC32, CLK_SRC_IRC, CLK_SRC_ENET_RX_CLK,
141 CLK_SRC_ENET_TX_CLK, CLK_SRC_GP_CLKIN, CLK_SRC_OSC,
142 CLK_SRC_PLL0AUDIO, CLK_SRC_PLL1, CLK_SRC_IDIVA,
143 };
144
145 static u32 lpc18xx_cgu_base_irc_src_ids[] = {CLK_SRC_IRC};
146
147 static u32 lpc18xx_cgu_base_usb0_src_ids[] = {CLK_SRC_PLL0USB};
148
149 static u32 lpc18xx_cgu_base_common_src_ids[] = {
150 CLK_SRC_OSC32, CLK_SRC_IRC, CLK_SRC_ENET_RX_CLK,
151 CLK_SRC_ENET_TX_CLK, CLK_SRC_GP_CLKIN, CLK_SRC_OSC,
152 CLK_SRC_PLL0AUDIO, CLK_SRC_PLL1, CLK_SRC_IDIVA,
153 CLK_SRC_IDIVB, CLK_SRC_IDIVC, CLK_SRC_IDIVD, CLK_SRC_IDIVE,
154 };
155
156 static u32 lpc18xx_cgu_base_all_src_ids[] = {
157 CLK_SRC_OSC32, CLK_SRC_IRC, CLK_SRC_ENET_RX_CLK,
158 CLK_SRC_ENET_TX_CLK, CLK_SRC_GP_CLKIN, CLK_SRC_OSC,
159 CLK_SRC_PLL0USB, CLK_SRC_PLL0AUDIO, CLK_SRC_PLL1,
160 CLK_SRC_IDIVA, CLK_SRC_IDIVB, CLK_SRC_IDIVC,
161 CLK_SRC_IDIVD, CLK_SRC_IDIVE,
162 };
163
164 struct lpc18xx_cgu_src_clk_div {
165 u8 clk_id;
166 u8 n_parents;
167 struct clk_divider div;
168 struct clk_mux mux;
169 struct clk_gate gate;
170 };
171
172 #define LPC1XX_CGU_SRC_CLK_DIV(_id, _width, _table) \
173 { \
174 .clk_id = CLK_SRC_ ##_id, \
175 .n_parents = ARRAY_SIZE(lpc18xx_cgu_ ##_table), \
176 .div = { \
177 .shift = 2, \
178 .width = _width, \
179 }, \
180 .mux = { \
181 .mask = 0x1f, \
182 .shift = 24, \
183 .table = lpc18xx_cgu_ ##_table, \
184 }, \
185 .gate = { \
186 .bit_idx = 0, \
187 .flags = CLK_GATE_SET_TO_DISABLE, \
188 }, \
189 }
190
191 static struct lpc18xx_cgu_src_clk_div lpc18xx_cgu_src_clk_divs[] = {
192 LPC1XX_CGU_SRC_CLK_DIV(IDIVA, 2, idiva_src_ids),
193 LPC1XX_CGU_SRC_CLK_DIV(IDIVB, 4, idivbcde_src_ids),
194 LPC1XX_CGU_SRC_CLK_DIV(IDIVC, 4, idivbcde_src_ids),
195 LPC1XX_CGU_SRC_CLK_DIV(IDIVD, 4, idivbcde_src_ids),
196 LPC1XX_CGU_SRC_CLK_DIV(IDIVE, 8, idivbcde_src_ids),
197 };
198
199 struct lpc18xx_cgu_base_clk {
200 u8 clk_id;
201 u8 n_parents;
202 struct clk_mux mux;
203 struct clk_gate gate;
204 };
205
206 #define LPC1XX_CGU_BASE_CLK(_id, _table, _flags) \
207 { \
208 .clk_id = BASE_ ##_id ##_CLK, \
209 .n_parents = ARRAY_SIZE(lpc18xx_cgu_ ##_table), \
210 .mux = { \
211 .mask = 0x1f, \
212 .shift = 24, \
213 .table = lpc18xx_cgu_ ##_table, \
214 .flags = _flags, \
215 }, \
216 .gate = { \
217 .bit_idx = 0, \
218 .flags = CLK_GATE_SET_TO_DISABLE, \
219 }, \
220 }
221
222 static struct lpc18xx_cgu_base_clk lpc18xx_cgu_base_clks[] = {
223 LPC1XX_CGU_BASE_CLK(SAFE, base_irc_src_ids, CLK_MUX_READ_ONLY),
224 LPC1XX_CGU_BASE_CLK(USB0, base_usb0_src_ids, 0),
225 LPC1XX_CGU_BASE_CLK(PERIPH, base_common_src_ids, 0),
226 LPC1XX_CGU_BASE_CLK(USB1, base_all_src_ids, 0),
227 LPC1XX_CGU_BASE_CLK(CPU, base_common_src_ids, 0),
228 LPC1XX_CGU_BASE_CLK(SPIFI, base_common_src_ids, 0),
229 LPC1XX_CGU_BASE_CLK(SPI, base_common_src_ids, 0),
230 LPC1XX_CGU_BASE_CLK(PHY_RX, base_common_src_ids, 0),
231 LPC1XX_CGU_BASE_CLK(PHY_TX, base_common_src_ids, 0),
232 LPC1XX_CGU_BASE_CLK(APB1, base_common_src_ids, 0),
233 LPC1XX_CGU_BASE_CLK(APB3, base_common_src_ids, 0),
234 LPC1XX_CGU_BASE_CLK(LCD, base_common_src_ids, 0),
235 LPC1XX_CGU_BASE_CLK(ADCHS, base_common_src_ids, 0),
236 LPC1XX_CGU_BASE_CLK(SDIO, base_common_src_ids, 0),
237 LPC1XX_CGU_BASE_CLK(SSP0, base_common_src_ids, 0),
238 LPC1XX_CGU_BASE_CLK(SSP1, base_common_src_ids, 0),
239 LPC1XX_CGU_BASE_CLK(UART0, base_common_src_ids, 0),
240 LPC1XX_CGU_BASE_CLK(UART1, base_common_src_ids, 0),
241 LPC1XX_CGU_BASE_CLK(UART2, base_common_src_ids, 0),
242 LPC1XX_CGU_BASE_CLK(UART3, base_common_src_ids, 0),
243 LPC1XX_CGU_BASE_CLK(OUT, base_all_src_ids, 0),
244 { /* 21 reserved */ },
245 { /* 22 reserved */ },
246 { /* 23 reserved */ },
247 { /* 24 reserved */ },
248 LPC1XX_CGU_BASE_CLK(AUDIO, base_common_src_ids, 0),
249 LPC1XX_CGU_BASE_CLK(CGU_OUT0, base_all_src_ids, 0),
250 LPC1XX_CGU_BASE_CLK(CGU_OUT1, base_all_src_ids, 0),
251 };
252
253 struct lpc18xx_pll {
254 struct clk_hw hw;
255 void __iomem *reg;
256 spinlock_t *lock;
257 u8 flags;
258 };
259
260 #define to_lpc_pll(hw) container_of(hw, struct lpc18xx_pll, hw)
261
262 struct lpc18xx_cgu_pll_clk {
263 u8 clk_id;
264 u8 n_parents;
265 u8 reg_offset;
266 struct clk_mux mux;
267 struct clk_gate gate;
268 struct lpc18xx_pll pll;
269 const struct clk_ops *pll_ops;
270 };
271
272 #define LPC1XX_CGU_CLK_PLL(_id, _table, _pll_ops) \
273 { \
274 .clk_id = CLK_SRC_ ##_id, \
275 .n_parents = ARRAY_SIZE(lpc18xx_cgu_ ##_table), \
276 .reg_offset = LPC18XX_CGU_ ##_id ##_STAT, \
277 .mux = { \
278 .mask = 0x1f, \
279 .shift = 24, \
280 .table = lpc18xx_cgu_ ##_table, \
281 }, \
282 .gate = { \
283 .bit_idx = 0, \
284 .flags = CLK_GATE_SET_TO_DISABLE, \
285 }, \
286 .pll_ops = &lpc18xx_ ##_pll_ops, \
287 }
288
289 /*
290 * PLL0 uses a special register value encoding. The compute functions below
291 * are taken or derived from the LPC1850 user manual (section 12.6.3.3).
292 */
293
294 /* Compute PLL0 multiplier from decoded version */
295 static u32 lpc18xx_pll0_mdec2msel(u32 x)
296 {
297 int i;
298
299 switch (x) {
300 case 0x18003: return 1;
301 case 0x10003: return 2;
302 default:
303 for (i = LPC18XX_PLL0_MSEL_MAX + 1; x != 0x4000 && i > 0; i--)
304 x = ((x ^ x >> 14) & 1) | (x << 1 & 0x7fff);
305 return i;
306 }
307 }
308 /* Compute PLL0 decoded multiplier from binary version */
309 static u32 lpc18xx_pll0_msel2mdec(u32 msel)
310 {
311 u32 i, x = 0x4000;
312
313 switch (msel) {
314 case 0: return 0;
315 case 1: return 0x18003;
316 case 2: return 0x10003;
317 default:
318 for (i = msel; i <= LPC18XX_PLL0_MSEL_MAX; i++)
319 x = ((x ^ x >> 1) & 1) << 14 | (x >> 1 & 0xffff);
320 return x;
321 }
322 }
323
324 /* Compute PLL0 bandwidth SELI reg from multiplier */
325 static u32 lpc18xx_pll0_msel2seli(u32 msel)
326 {
327 u32 tmp;
328
329 if (msel > 16384) return 1;
330 if (msel > 8192) return 2;
331 if (msel > 2048) return 4;
332 if (msel >= 501) return 8;
333 if (msel >= 60) {
334 tmp = 1024 / (msel + 9);
335 return ((1024 == (tmp * (msel + 9))) == 0) ? tmp * 4 : (tmp + 1) * 4;
336 }
337
338 return (msel & 0x3c) + 4;
339 }
340
341 /* Compute PLL0 bandwidth SELP reg from multiplier */
342 static u32 lpc18xx_pll0_msel2selp(u32 msel)
343 {
344 if (msel < 60)
345 return (msel >> 1) + 1;
346
347 return 31;
348 }
349
350 static unsigned long lpc18xx_pll0_recalc_rate(struct clk_hw *hw,
351 unsigned long parent_rate)
352 {
353 struct lpc18xx_pll *pll = to_lpc_pll(hw);
354 u32 ctrl, mdiv, msel, npdiv;
355
356 ctrl = readl(pll->reg + LPC18XX_CGU_PLL0USB_CTRL);
357 mdiv = readl(pll->reg + LPC18XX_CGU_PLL0USB_MDIV);
358 npdiv = readl(pll->reg + LPC18XX_CGU_PLL0USB_NP_DIV);
359
360 if (ctrl & LPC18XX_PLL0_CTRL_BYPASS)
361 return parent_rate;
362
363 if (npdiv != LPC18XX_PLL0_NP_DIVS_1) {
364 pr_warn("%s: pre/post dividers not supported\n", __func__);
365 return 0;
366 }
367
368 msel = lpc18xx_pll0_mdec2msel(mdiv & LPC18XX_PLL0_MDIV_MDEC_MASK);
369 if (msel)
370 return 2 * msel * parent_rate;
371
372 pr_warn("%s: unable to calculate rate\n", __func__);
373
374 return 0;
375 }
376
377 static long lpc18xx_pll0_round_rate(struct clk_hw *hw, unsigned long rate,
378 unsigned long *prate)
379 {
380 unsigned long m;
381
382 if (*prate < rate) {
383 pr_warn("%s: pll dividers not supported\n", __func__);
384 return -EINVAL;
385 }
386
387 m = DIV_ROUND_UP_ULL(*prate, rate * 2);
388 if (m <= 0 && m > LPC18XX_PLL0_MSEL_MAX) {
389 pr_warn("%s: unable to support rate %lu\n", __func__, rate);
390 return -EINVAL;
391 }
392
393 return 2 * *prate * m;
394 }
395
396 static int lpc18xx_pll0_set_rate(struct clk_hw *hw, unsigned long rate,
397 unsigned long parent_rate)
398 {
399 struct lpc18xx_pll *pll = to_lpc_pll(hw);
400 u32 ctrl, stat, m;
401 int retry = 3;
402
403 if (parent_rate < rate) {
404 pr_warn("%s: pll dividers not supported\n", __func__);
405 return -EINVAL;
406 }
407
408 m = DIV_ROUND_UP_ULL(parent_rate, rate * 2);
409 if (m <= 0 && m > LPC18XX_PLL0_MSEL_MAX) {
410 pr_warn("%s: unable to support rate %lu\n", __func__, rate);
411 return -EINVAL;
412 }
413
414 m = lpc18xx_pll0_msel2mdec(m);
415 m |= lpc18xx_pll0_msel2selp(m) << LPC18XX_PLL0_MDIV_SELP_SHIFT;
416 m |= lpc18xx_pll0_msel2seli(m) << LPC18XX_PLL0_MDIV_SELI_SHIFT;
417
418 /* Power down PLL, disable clk output and dividers */
419 ctrl = readl(pll->reg + LPC18XX_CGU_PLL0USB_CTRL);
420 ctrl |= LPC18XX_PLL0_CTRL_PD;
421 ctrl &= ~(LPC18XX_PLL0_CTRL_BYPASS | LPC18XX_PLL0_CTRL_DIRECTI |
422 LPC18XX_PLL0_CTRL_DIRECTO | LPC18XX_PLL0_CTRL_CLKEN);
423 writel(ctrl, pll->reg + LPC18XX_CGU_PLL0USB_CTRL);
424
425 /* Configure new PLL settings */
426 writel(m, pll->reg + LPC18XX_CGU_PLL0USB_MDIV);
427 writel(LPC18XX_PLL0_NP_DIVS_1, pll->reg + LPC18XX_CGU_PLL0USB_NP_DIV);
428
429 /* Power up PLL and wait for lock */
430 ctrl &= ~LPC18XX_PLL0_CTRL_PD;
431 writel(ctrl, pll->reg + LPC18XX_CGU_PLL0USB_CTRL);
432 do {
433 udelay(10);
434 stat = readl(pll->reg + LPC18XX_CGU_PLL0USB_STAT);
435 if (stat & LPC18XX_PLL0_STAT_LOCK) {
436 ctrl |= LPC18XX_PLL0_CTRL_CLKEN;
437 writel(ctrl, pll->reg + LPC18XX_CGU_PLL0USB_CTRL);
438
439 return 0;
440 }
441 } while (retry--);
442
443 pr_warn("%s: unable to lock pll\n", __func__);
444
445 return -EINVAL;
446 }
447
448 static const struct clk_ops lpc18xx_pll0_ops = {
449 .recalc_rate = lpc18xx_pll0_recalc_rate,
450 .round_rate = lpc18xx_pll0_round_rate,
451 .set_rate = lpc18xx_pll0_set_rate,
452 };
453
454 static unsigned long lpc18xx_pll1_recalc_rate(struct clk_hw *hw,
455 unsigned long parent_rate)
456 {
457 struct lpc18xx_pll *pll = to_lpc_pll(hw);
458 u16 msel, nsel, psel;
459 bool direct, fbsel;
460 u32 stat, ctrl;
461
462 stat = readl(pll->reg + LPC18XX_CGU_PLL1_STAT);
463 ctrl = readl(pll->reg + LPC18XX_CGU_PLL1_CTRL);
464
465 direct = (ctrl & LPC18XX_PLL1_CTRL_DIRECT) ? true : false;
466 fbsel = (ctrl & LPC18XX_PLL1_CTRL_FBSEL) ? true : false;
467
468 msel = ((ctrl >> 16) & 0xff) + 1;
469 nsel = ((ctrl >> 12) & 0x3) + 1;
470
471 if (direct || fbsel)
472 return msel * (parent_rate / nsel);
473
474 psel = (ctrl >> 8) & 0x3;
475 psel = 1 << psel;
476
477 return (msel / (2 * psel)) * (parent_rate / nsel);
478 }
479
480 static const struct clk_ops lpc18xx_pll1_ops = {
481 .recalc_rate = lpc18xx_pll1_recalc_rate,
482 };
483
484 static int lpc18xx_cgu_gate_enable(struct clk_hw *hw)
485 {
486 return clk_gate_ops.enable(hw);
487 }
488
489 static void lpc18xx_cgu_gate_disable(struct clk_hw *hw)
490 {
491 clk_gate_ops.disable(hw);
492 }
493
494 static int lpc18xx_cgu_gate_is_enabled(struct clk_hw *hw)
495 {
496 const struct clk_hw *parent;
497
498 /*
499 * The consumer of base clocks needs know if the
500 * base clock is really enabled before it can be
501 * accessed. It is therefore necessary to verify
502 * this all the way up.
503 */
504 parent = clk_hw_get_parent(hw);
505 if (!parent)
506 return 0;
507
508 if (!clk_hw_is_enabled(parent))
509 return 0;
510
511 return clk_gate_ops.is_enabled(hw);
512 }
513
514 static const struct clk_ops lpc18xx_gate_ops = {
515 .enable = lpc18xx_cgu_gate_enable,
516 .disable = lpc18xx_cgu_gate_disable,
517 .is_enabled = lpc18xx_cgu_gate_is_enabled,
518 };
519
520 static struct lpc18xx_cgu_pll_clk lpc18xx_cgu_src_clk_plls[] = {
521 LPC1XX_CGU_CLK_PLL(PLL0USB, pll0_src_ids, pll0_ops),
522 LPC1XX_CGU_CLK_PLL(PLL0AUDIO, pll0_src_ids, pll0_ops),
523 LPC1XX_CGU_CLK_PLL(PLL1, pll1_src_ids, pll1_ops),
524 };
525
526 static void lpc18xx_fill_parent_names(const char **parent, u32 *id, int size)
527 {
528 int i;
529
530 for (i = 0; i < size; i++)
531 parent[i] = clk_src_names[id[i]];
532 }
533
534 static struct clk *lpc18xx_cgu_register_div(struct lpc18xx_cgu_src_clk_div *clk,
535 void __iomem *base, int n)
536 {
537 void __iomem *reg = base + LPC18XX_CGU_IDIV_CTRL(n);
538 const char *name = clk_src_names[clk->clk_id];
539 const char *parents[CLK_SRC_MAX];
540
541 clk->div.reg = reg;
542 clk->mux.reg = reg;
543 clk->gate.reg = reg;
544
545 lpc18xx_fill_parent_names(parents, clk->mux.table, clk->n_parents);
546
547 return clk_register_composite(NULL, name, parents, clk->n_parents,
548 &clk->mux.hw, &clk_mux_ops,
549 &clk->div.hw, &clk_divider_ops,
550 &clk->gate.hw, &lpc18xx_gate_ops, 0);
551 }
552
553
554 static struct clk *lpc18xx_register_base_clk(struct lpc18xx_cgu_base_clk *clk,
555 void __iomem *reg_base, int n)
556 {
557 void __iomem *reg = reg_base + LPC18XX_CGU_BASE_CLK(n);
558 const char *name = clk_base_names[clk->clk_id];
559 const char *parents[CLK_SRC_MAX];
560
561 if (clk->n_parents == 0)
562 return ERR_PTR(-ENOENT);
563
564 clk->mux.reg = reg;
565 clk->gate.reg = reg;
566
567 lpc18xx_fill_parent_names(parents, clk->mux.table, clk->n_parents);
568
569 /* SAFE_CLK can not be turned off */
570 if (n == BASE_SAFE_CLK)
571 return clk_register_composite(NULL, name, parents, clk->n_parents,
572 &clk->mux.hw, &clk_mux_ops,
573 NULL, NULL, NULL, NULL, 0);
574
575 return clk_register_composite(NULL, name, parents, clk->n_parents,
576 &clk->mux.hw, &clk_mux_ops,
577 NULL, NULL,
578 &clk->gate.hw, &lpc18xx_gate_ops, 0);
579 }
580
581
582 static struct clk *lpc18xx_cgu_register_pll(struct lpc18xx_cgu_pll_clk *clk,
583 void __iomem *base)
584 {
585 const char *name = clk_src_names[clk->clk_id];
586 const char *parents[CLK_SRC_MAX];
587
588 clk->pll.reg = base;
589 clk->mux.reg = base + clk->reg_offset + LPC18XX_CGU_PLL_CTRL_OFFSET;
590 clk->gate.reg = base + clk->reg_offset + LPC18XX_CGU_PLL_CTRL_OFFSET;
591
592 lpc18xx_fill_parent_names(parents, clk->mux.table, clk->n_parents);
593
594 return clk_register_composite(NULL, name, parents, clk->n_parents,
595 &clk->mux.hw, &clk_mux_ops,
596 &clk->pll.hw, clk->pll_ops,
597 &clk->gate.hw, &lpc18xx_gate_ops, 0);
598 }
599
600 static void __init lpc18xx_cgu_register_source_clks(struct device_node *np,
601 void __iomem *base)
602 {
603 const char *parents[CLK_SRC_MAX];
604 struct clk *clk;
605 int i;
606
607 /* Register the internal 12 MHz RC oscillator (IRC) */
608 clk = clk_register_fixed_rate(NULL, clk_src_names[CLK_SRC_IRC],
609 NULL, 0, 12000000);
610 if (IS_ERR(clk))
611 pr_warn("%s: failed to register irc clk\n", __func__);
612
613 /* Register crystal oscillator controlller */
614 parents[0] = of_clk_get_parent_name(np, 0);
615 clk = clk_register_gate(NULL, clk_src_names[CLK_SRC_OSC], parents[0],
616 0, base + LPC18XX_CGU_XTAL_OSC_CTRL,
617 0, CLK_GATE_SET_TO_DISABLE, NULL);
618 if (IS_ERR(clk))
619 pr_warn("%s: failed to register osc clk\n", __func__);
620
621 /* Register all PLLs */
622 for (i = 0; i < ARRAY_SIZE(lpc18xx_cgu_src_clk_plls); i++) {
623 clk = lpc18xx_cgu_register_pll(&lpc18xx_cgu_src_clk_plls[i],
624 base);
625 if (IS_ERR(clk))
626 pr_warn("%s: failed to register pll (%d)\n", __func__, i);
627 }
628
629 /* Register all clock dividers A-E */
630 for (i = 0; i < ARRAY_SIZE(lpc18xx_cgu_src_clk_divs); i++) {
631 clk = lpc18xx_cgu_register_div(&lpc18xx_cgu_src_clk_divs[i],
632 base, i);
633 if (IS_ERR(clk))
634 pr_warn("%s: failed to register div %d\n", __func__, i);
635 }
636 }
637
638 static struct clk *clk_base[BASE_CLK_MAX];
639 static struct clk_onecell_data clk_base_data = {
640 .clks = clk_base,
641 .clk_num = BASE_CLK_MAX,
642 };
643
644 static void __init lpc18xx_cgu_register_base_clks(void __iomem *reg_base)
645 {
646 int i;
647
648 for (i = BASE_SAFE_CLK; i < BASE_CLK_MAX; i++) {
649 clk_base[i] = lpc18xx_register_base_clk(&lpc18xx_cgu_base_clks[i],
650 reg_base, i);
651 if (IS_ERR(clk_base[i]) && PTR_ERR(clk_base[i]) != -ENOENT)
652 pr_warn("%s: register base clk %d failed\n", __func__, i);
653 }
654 }
655
656 static void __init lpc18xx_cgu_init(struct device_node *np)
657 {
658 void __iomem *reg_base;
659
660 reg_base = of_iomap(np, 0);
661 if (!reg_base) {
662 pr_warn("%s: failed to map address range\n", __func__);
663 return;
664 }
665
666 lpc18xx_cgu_register_source_clks(np, reg_base);
667 lpc18xx_cgu_register_base_clks(reg_base);
668
669 of_clk_add_provider(np, of_clk_src_onecell_get, &clk_base_data);
670 }
671 CLK_OF_DECLARE(lpc18xx_cgu, "nxp,lpc1850-cgu", lpc18xx_cgu_init);
Linux with added FPC-III support