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 ctrl;
461 
462 	ctrl = readl(pll->reg + LPC18XX_CGU_PLL1_CTRL);
463 
464 	direct = (ctrl & LPC18XX_PLL1_CTRL_DIRECT) ? true : false;
465 	fbsel = (ctrl & LPC18XX_PLL1_CTRL_FBSEL) ? true : false;
466 
467 	msel = ((ctrl >> 16) & 0xff) + 1;
468 	nsel = ((ctrl >> 12) & 0x3) + 1;
469 
470 	if (direct || fbsel)
471 		return msel * (parent_rate / nsel);
472 
473 	psel = (ctrl >>  8) & 0x3;
474 	psel = 1 << psel;
475 
476 	return (msel / (2 * psel)) * (parent_rate / nsel);
477 }
478 
479 static const struct clk_ops lpc18xx_pll1_ops = {
480 	.recalc_rate = lpc18xx_pll1_recalc_rate,
481 };
482 
483 static int lpc18xx_cgu_gate_enable(struct clk_hw *hw)
484 {
485 	return clk_gate_ops.enable(hw);
486 }
487 
488 static void lpc18xx_cgu_gate_disable(struct clk_hw *hw)
489 {
490 	clk_gate_ops.disable(hw);
491 }
492 
493 static int lpc18xx_cgu_gate_is_enabled(struct clk_hw *hw)
494 {
495 	const struct clk_hw *parent;
496 
497 	/*
498 	 * The consumer of base clocks needs know if the
499 	 * base clock is really enabled before it can be
500 	 * accessed. It is therefore necessary to verify
501 	 * this all the way up.
502 	 */
503 	parent = clk_hw_get_parent(hw);
504 	if (!parent)
505 		return 0;
506 
507 	if (!clk_hw_is_enabled(parent))
508 		return 0;
509 
510 	return clk_gate_ops.is_enabled(hw);
511 }
512 
513 static const struct clk_ops lpc18xx_gate_ops = {
514 	.enable = lpc18xx_cgu_gate_enable,
515 	.disable = lpc18xx_cgu_gate_disable,
516 	.is_enabled = lpc18xx_cgu_gate_is_enabled,
517 };
518 
519 static struct lpc18xx_cgu_pll_clk lpc18xx_cgu_src_clk_plls[] = {
520 	LPC1XX_CGU_CLK_PLL(PLL0USB,	pll0_src_ids, pll0_ops),
521 	LPC1XX_CGU_CLK_PLL(PLL0AUDIO,	pll0_src_ids, pll0_ops),
522 	LPC1XX_CGU_CLK_PLL(PLL1,	pll1_src_ids, pll1_ops),
523 };
524 
525 static void lpc18xx_fill_parent_names(const char **parent, const u32 *id, int size)
526 {
527 	int i;
528 
529 	for (i = 0; i < size; i++)
530 		parent[i] = clk_src_names[id[i]];
531 }
532 
533 static struct clk *lpc18xx_cgu_register_div(struct lpc18xx_cgu_src_clk_div *clk,
534 					    void __iomem *base, int n)
535 {
536 	void __iomem *reg = base + LPC18XX_CGU_IDIV_CTRL(n);
537 	const char *name = clk_src_names[clk->clk_id];
538 	const char *parents[CLK_SRC_MAX];
539 
540 	clk->div.reg = reg;
541 	clk->mux.reg = reg;
542 	clk->gate.reg = reg;
543 
544 	lpc18xx_fill_parent_names(parents, clk->mux.table, clk->n_parents);
545 
546 	return clk_register_composite(NULL, name, parents, clk->n_parents,
547 				      &clk->mux.hw, &clk_mux_ops,
548 				      &clk->div.hw, &clk_divider_ops,
549 				      &clk->gate.hw, &lpc18xx_gate_ops, 0);
550 }
551 
552 
553 static struct clk *lpc18xx_register_base_clk(struct lpc18xx_cgu_base_clk *clk,
554 					     void __iomem *reg_base, int n)
555 {
556 	void __iomem *reg = reg_base + LPC18XX_CGU_BASE_CLK(n);
557 	const char *name = clk_base_names[clk->clk_id];
558 	const char *parents[CLK_SRC_MAX];
559 
560 	if (clk->n_parents == 0)
561 		return ERR_PTR(-ENOENT);
562 
563 	clk->mux.reg = reg;
564 	clk->gate.reg = reg;
565 
566 	lpc18xx_fill_parent_names(parents, clk->mux.table, clk->n_parents);
567 
568 	/* SAFE_CLK can not be turned off */
569 	if (n == BASE_SAFE_CLK)
570 		return clk_register_composite(NULL, name, parents, clk->n_parents,
571 					      &clk->mux.hw, &clk_mux_ops,
572 					      NULL, NULL, NULL, NULL, 0);
573 
574 	return clk_register_composite(NULL, name, parents, clk->n_parents,
575 				      &clk->mux.hw, &clk_mux_ops,
576 				      NULL,  NULL,
577 				      &clk->gate.hw, &lpc18xx_gate_ops, 0);
578 }
579 
580 
581 static struct clk *lpc18xx_cgu_register_pll(struct lpc18xx_cgu_pll_clk *clk,
582 					    void __iomem *base)
583 {
584 	const char *name = clk_src_names[clk->clk_id];
585 	const char *parents[CLK_SRC_MAX];
586 
587 	clk->pll.reg  = base;
588 	clk->mux.reg  = base + clk->reg_offset + LPC18XX_CGU_PLL_CTRL_OFFSET;
589 	clk->gate.reg = base + clk->reg_offset + LPC18XX_CGU_PLL_CTRL_OFFSET;
590 
591 	lpc18xx_fill_parent_names(parents, clk->mux.table, clk->n_parents);
592 
593 	return clk_register_composite(NULL, name, parents, clk->n_parents,
594 				      &clk->mux.hw, &clk_mux_ops,
595 				      &clk->pll.hw, clk->pll_ops,
596 				      &clk->gate.hw, &lpc18xx_gate_ops, 0);
597 }
598 
599 static void __init lpc18xx_cgu_register_source_clks(struct device_node *np,
600 						    void __iomem *base)
601 {
602 	const char *parents[CLK_SRC_MAX];
603 	struct clk *clk;
604 	int i;
605 
606 	/* Register the internal 12 MHz RC oscillator (IRC) */
607 	clk = clk_register_fixed_rate(NULL, clk_src_names[CLK_SRC_IRC],
608 				      NULL, 0, 12000000);
609 	if (IS_ERR(clk))
610 		pr_warn("%s: failed to register irc clk\n", __func__);
611 
612 	/* Register crystal oscillator controlller */
613 	parents[0] = of_clk_get_parent_name(np, 0);
614 	clk = clk_register_gate(NULL, clk_src_names[CLK_SRC_OSC], parents[0],
615 				0, base + LPC18XX_CGU_XTAL_OSC_CTRL,
616 				0, CLK_GATE_SET_TO_DISABLE, NULL);
617 	if (IS_ERR(clk))
618 		pr_warn("%s: failed to register osc clk\n", __func__);
619 
620 	/* Register all PLLs */
621 	for (i = 0; i < ARRAY_SIZE(lpc18xx_cgu_src_clk_plls); i++) {
622 		clk = lpc18xx_cgu_register_pll(&lpc18xx_cgu_src_clk_plls[i],
623 						   base);
624 		if (IS_ERR(clk))
625 			pr_warn("%s: failed to register pll (%d)\n", __func__, i);
626 	}
627 
628 	/* Register all clock dividers A-E */
629 	for (i = 0; i < ARRAY_SIZE(lpc18xx_cgu_src_clk_divs); i++) {
630 		clk = lpc18xx_cgu_register_div(&lpc18xx_cgu_src_clk_divs[i],
631 					       base, i);
632 		if (IS_ERR(clk))
633 			pr_warn("%s: failed to register div %d\n", __func__, i);
634 	}
635 }
636 
637 static struct clk *clk_base[BASE_CLK_MAX];
638 static struct clk_onecell_data clk_base_data = {
639 	.clks = clk_base,
640 	.clk_num = BASE_CLK_MAX,
641 };
642 
643 static void __init lpc18xx_cgu_register_base_clks(void __iomem *reg_base)
644 {
645 	int i;
646 
647 	for (i = BASE_SAFE_CLK; i < BASE_CLK_MAX; i++) {
648 		clk_base[i] = lpc18xx_register_base_clk(&lpc18xx_cgu_base_clks[i],
649 							reg_base, i);
650 		if (IS_ERR(clk_base[i]) && PTR_ERR(clk_base[i]) != -ENOENT)
651 			pr_warn("%s: register base clk %d failed\n", __func__, i);
652 	}
653 }
654 
655 static void __init lpc18xx_cgu_init(struct device_node *np)
656 {
657 	void __iomem *reg_base;
658 
659 	reg_base = of_iomap(np, 0);
660 	if (!reg_base) {
661 		pr_warn("%s: failed to map address range\n", __func__);
662 		return;
663 	}
664 
665 	lpc18xx_cgu_register_source_clks(np, reg_base);
666 	lpc18xx_cgu_register_base_clks(reg_base);
667 
668 	of_clk_add_provider(np, of_clk_src_onecell_get, &clk_base_data);
669 }
670 CLK_OF_DECLARE(lpc18xx_cgu, "nxp,lpc1850-cgu", lpc18xx_cgu_init);
671