1 /*
2  * (C) Copyright 2015 Google, Inc
3  *
4  * SPDX-License-Identifier:	GPL-2.0
5  */
6 
7 #include <common.h>
8 #include <clk-uclass.h>
9 #include <dm.h>
10 #include <errno.h>
11 #include <syscon.h>
12 #include <asm/io.h>
13 #include <asm/arch/clock.h>
14 #include <asm/arch/cru_rk3036.h>
15 #include <asm/arch/hardware.h>
16 #include <dm/lists.h>
17 #include <dt-bindings/clock/rk3036-cru.h>
18 #include <linux/log2.h>
19 
20 DECLARE_GLOBAL_DATA_PTR;
21 
22 enum {
23 	VCO_MAX_HZ	= 2400U * 1000000,
24 	VCO_MIN_HZ	= 600 * 1000000,
25 	OUTPUT_MAX_HZ	= 2400U * 1000000,
26 	OUTPUT_MIN_HZ	= 24 * 1000000,
27 };
28 
29 #define RATE_TO_DIV(input_rate, output_rate) \
30 	((input_rate) / (output_rate) - 1);
31 
32 #define DIV_TO_RATE(input_rate, div)	((input_rate) / ((div) + 1))
33 
34 #define PLL_DIVISORS(hz, _refdiv, _postdiv1, _postdiv2) {\
35 	.refdiv = _refdiv,\
36 	.fbdiv = (u32)((u64)hz * _refdiv * _postdiv1 * _postdiv2 / OSC_HZ),\
37 	.postdiv1 = _postdiv1, .postdiv2 = _postdiv2};\
38 	_Static_assert(((u64)hz * _refdiv * _postdiv1 * _postdiv2 / OSC_HZ) *\
39 			 OSC_HZ / (_refdiv * _postdiv1 * _postdiv2) == hz,\
40 			 #hz "Hz cannot be hit with PLL "\
41 			 "divisors on line " __stringify(__LINE__));
42 
43 /* use interge mode*/
44 static const struct pll_div apll_init_cfg = PLL_DIVISORS(APLL_HZ, 1, 3, 1);
45 static const struct pll_div gpll_init_cfg = PLL_DIVISORS(GPLL_HZ, 2, 2, 1);
46 
47 static int rkclk_set_pll(struct rk3036_cru *cru, enum rk_clk_id clk_id,
48 			 const struct pll_div *div)
49 {
50 	int pll_id = rk_pll_id(clk_id);
51 	struct rk3036_pll *pll = &cru->pll[pll_id];
52 
53 	/* All PLLs have same VCO and output frequency range restrictions. */
54 	uint vco_hz = OSC_HZ / 1000 * div->fbdiv / div->refdiv * 1000;
55 	uint output_hz = vco_hz / div->postdiv1 / div->postdiv2;
56 
57 	debug("PLL at %p: fbdiv=%d, refdiv=%d, postdiv1=%d, postdiv2=%d,\
58 		 vco=%u Hz, output=%u Hz\n",
59 			pll, div->fbdiv, div->refdiv, div->postdiv1,
60 			div->postdiv2, vco_hz, output_hz);
61 	assert(vco_hz >= VCO_MIN_HZ && vco_hz <= VCO_MAX_HZ &&
62 	       output_hz >= OUTPUT_MIN_HZ && output_hz <= OUTPUT_MAX_HZ);
63 
64 	/* use interger mode */
65 	rk_clrreg(&pll->con1, 1 << PLL_DSMPD_SHIFT);
66 
67 	rk_clrsetreg(&pll->con0,
68 		     PLL_POSTDIV1_MASK | PLL_FBDIV_MASK,
69 		     (div->postdiv1 << PLL_POSTDIV1_SHIFT) | div->fbdiv);
70 	rk_clrsetreg(&pll->con1, PLL_POSTDIV2_MASK | PLL_REFDIV_MASK,
71 		     (div->postdiv2 << PLL_POSTDIV2_SHIFT |
72 		     div->refdiv << PLL_REFDIV_SHIFT));
73 
74 	/* waiting for pll lock */
75 	while (readl(&pll->con1) & (1 << PLL_LOCK_STATUS_SHIFT))
76 		udelay(1);
77 
78 	return 0;
79 }
80 
81 static void rkclk_init(struct rk3036_cru *cru)
82 {
83 	u32 aclk_div;
84 	u32 hclk_div;
85 	u32 pclk_div;
86 
87 	/* pll enter slow-mode */
88 	rk_clrsetreg(&cru->cru_mode_con,
89 		     GPLL_MODE_MASK | APLL_MODE_MASK,
90 		     GPLL_MODE_SLOW << GPLL_MODE_SHIFT |
91 		     APLL_MODE_SLOW << APLL_MODE_SHIFT);
92 
93 	/* init pll */
94 	rkclk_set_pll(cru, CLK_ARM, &apll_init_cfg);
95 	rkclk_set_pll(cru, CLK_GENERAL, &gpll_init_cfg);
96 
97 	/*
98 	 * select apll as cpu/core clock pll source and
99 	 * set up dependent divisors for PERI and ACLK clocks.
100 	 * core hz : apll = 1:1
101 	 */
102 	aclk_div = APLL_HZ / CORE_ACLK_HZ - 1;
103 	assert((aclk_div + 1) * CORE_ACLK_HZ == APLL_HZ && aclk_div < 0x7);
104 
105 	pclk_div = APLL_HZ / CORE_PERI_HZ - 1;
106 	assert((pclk_div + 1) * CORE_PERI_HZ == APLL_HZ && pclk_div < 0xf);
107 
108 	rk_clrsetreg(&cru->cru_clksel_con[0],
109 		     CORE_CLK_PLL_SEL_MASK | CORE_DIV_CON_MASK,
110 		     CORE_CLK_PLL_SEL_APLL << CORE_CLK_PLL_SEL_SHIFT |
111 		     0 << CORE_DIV_CON_SHIFT);
112 
113 	rk_clrsetreg(&cru->cru_clksel_con[1],
114 		     CORE_ACLK_DIV_MASK | CORE_PERI_DIV_MASK,
115 		     aclk_div << CORE_ACLK_DIV_SHIFT |
116 		     pclk_div << CORE_PERI_DIV_SHIFT);
117 
118 	/*
119 	 * select apll as pd_bus bus clock source and
120 	 * set up dependent divisors for PCLK/HCLK and ACLK clocks.
121 	 */
122 	aclk_div = GPLL_HZ / BUS_ACLK_HZ - 1;
123 	assert((aclk_div + 1) * BUS_ACLK_HZ == GPLL_HZ && aclk_div <= 0x1f);
124 
125 	pclk_div = GPLL_HZ / BUS_PCLK_HZ - 1;
126 	assert((pclk_div + 1) * BUS_PCLK_HZ == GPLL_HZ && pclk_div <= 0x7);
127 
128 	hclk_div = GPLL_HZ / BUS_HCLK_HZ - 1;
129 	assert((hclk_div + 1) * BUS_HCLK_HZ == GPLL_HZ && hclk_div <= 0x3);
130 
131 	rk_clrsetreg(&cru->cru_clksel_con[0],
132 		     BUS_ACLK_PLL_SEL_MASK | BUS_ACLK_DIV_MASK,
133 		     BUS_ACLK_PLL_SEL_GPLL << BUS_ACLK_PLL_SEL_SHIFT |
134 		     aclk_div << BUS_ACLK_DIV_SHIFT);
135 
136 	rk_clrsetreg(&cru->cru_clksel_con[1],
137 		     BUS_PCLK_DIV_MASK | BUS_HCLK_DIV_MASK,
138 		     pclk_div << BUS_PCLK_DIV_SHIFT |
139 		     hclk_div << BUS_HCLK_DIV_SHIFT);
140 
141 	/*
142 	 * select gpll as pd_peri bus clock source and
143 	 * set up dependent divisors for PCLK/HCLK and ACLK clocks.
144 	 */
145 	aclk_div = GPLL_HZ / PERI_ACLK_HZ - 1;
146 	assert((aclk_div + 1) * PERI_ACLK_HZ == GPLL_HZ && aclk_div < 0x1f);
147 
148 	hclk_div = ilog2(PERI_ACLK_HZ / PERI_HCLK_HZ);
149 	assert((1 << hclk_div) * PERI_HCLK_HZ ==
150 		PERI_ACLK_HZ && (hclk_div < 0x4));
151 
152 	pclk_div = ilog2(PERI_ACLK_HZ / PERI_PCLK_HZ);
153 	assert((1 << pclk_div) * PERI_PCLK_HZ ==
154 		PERI_ACLK_HZ && pclk_div < 0x8);
155 
156 	rk_clrsetreg(&cru->cru_clksel_con[10],
157 		     PERI_PLL_SEL_MASK | PERI_PCLK_DIV_MASK |
158 		     PERI_HCLK_DIV_MASK | PERI_ACLK_DIV_MASK,
159 		     PERI_PLL_GPLL << PERI_PLL_SEL_SHIFT |
160 		     pclk_div << PERI_PCLK_DIV_SHIFT |
161 		     hclk_div << PERI_HCLK_DIV_SHIFT |
162 		     aclk_div << PERI_ACLK_DIV_SHIFT);
163 
164 	/* PLL enter normal-mode */
165 	rk_clrsetreg(&cru->cru_mode_con,
166 		     GPLL_MODE_MASK | APLL_MODE_MASK,
167 		     GPLL_MODE_NORM << GPLL_MODE_SHIFT |
168 		     APLL_MODE_NORM << APLL_MODE_SHIFT);
169 }
170 
171 /* Get pll rate by id */
172 static uint32_t rkclk_pll_get_rate(struct rk3036_cru *cru,
173 				   enum rk_clk_id clk_id)
174 {
175 	uint32_t refdiv, fbdiv, postdiv1, postdiv2;
176 	uint32_t con;
177 	int pll_id = rk_pll_id(clk_id);
178 	struct rk3036_pll *pll = &cru->pll[pll_id];
179 	static u8 clk_shift[CLK_COUNT] = {
180 		0xff, APLL_MODE_SHIFT, DPLL_MODE_SHIFT, 0xff,
181 		GPLL_MODE_SHIFT, 0xff
182 	};
183 	static u32 clk_mask[CLK_COUNT] = {
184 		0xffffffff, APLL_MODE_MASK, DPLL_MODE_MASK, 0xffffffff,
185 		GPLL_MODE_MASK, 0xffffffff
186 	};
187 	uint shift;
188 	uint mask;
189 
190 	con = readl(&cru->cru_mode_con);
191 	shift = clk_shift[clk_id];
192 	mask = clk_mask[clk_id];
193 
194 	switch ((con & mask) >> shift) {
195 	case GPLL_MODE_SLOW:
196 		return OSC_HZ;
197 	case GPLL_MODE_NORM:
198 
199 		/* normal mode */
200 		con = readl(&pll->con0);
201 		postdiv1 = (con & PLL_POSTDIV1_MASK) >> PLL_POSTDIV1_SHIFT;
202 		fbdiv = (con & PLL_FBDIV_MASK) >> PLL_FBDIV_SHIFT;
203 		con = readl(&pll->con1);
204 		postdiv2 = (con & PLL_POSTDIV2_MASK) >> PLL_POSTDIV2_SHIFT;
205 		refdiv = (con & PLL_REFDIV_MASK) >> PLL_REFDIV_SHIFT;
206 		return (24 * fbdiv / (refdiv * postdiv1 * postdiv2)) * 1000000;
207 	case GPLL_MODE_DEEP:
208 	default:
209 		return 32768;
210 	}
211 }
212 
213 static ulong rockchip_mmc_get_clk(struct rk3036_cru *cru, uint clk_general_rate,
214 				  int periph)
215 {
216 	uint src_rate;
217 	uint div, mux;
218 	u32 con;
219 
220 	switch (periph) {
221 	case HCLK_EMMC:
222 	case SCLK_EMMC:
223 		con = readl(&cru->cru_clksel_con[12]);
224 		mux = (con & EMMC_PLL_MASK) >> EMMC_PLL_SHIFT;
225 		div = (con & EMMC_DIV_MASK) >> EMMC_DIV_SHIFT;
226 		break;
227 	case HCLK_SDIO:
228 	case SCLK_SDIO:
229 		con = readl(&cru->cru_clksel_con[12]);
230 		mux = (con & MMC0_PLL_MASK) >> MMC0_PLL_SHIFT;
231 		div = (con & MMC0_DIV_MASK) >> MMC0_DIV_SHIFT;
232 		break;
233 	default:
234 		return -EINVAL;
235 	}
236 
237 	src_rate = mux == EMMC_SEL_24M ? OSC_HZ : clk_general_rate;
238 	return DIV_TO_RATE(src_rate, div);
239 }
240 
241 static ulong rockchip_mmc_set_clk(struct rk3036_cru *cru, uint clk_general_rate,
242 				  int periph, uint freq)
243 {
244 	int src_clk_div;
245 	int mux;
246 
247 	debug("%s: clk_general_rate=%u\n", __func__, clk_general_rate);
248 
249 	/* mmc clock auto divide 2 in internal */
250 	src_clk_div = (clk_general_rate / 2 + freq - 1) / freq;
251 
252 	if (src_clk_div > 0x7f) {
253 		src_clk_div = (OSC_HZ / 2 + freq - 1) / freq;
254 		mux = EMMC_SEL_24M;
255 	} else {
256 		mux = EMMC_SEL_GPLL;
257 	}
258 
259 	switch (periph) {
260 	case HCLK_EMMC:
261 	case SCLK_EMMC:
262 		rk_clrsetreg(&cru->cru_clksel_con[12],
263 			     EMMC_PLL_MASK | EMMC_DIV_MASK,
264 			     mux << EMMC_PLL_SHIFT |
265 			     (src_clk_div - 1) << EMMC_DIV_SHIFT);
266 		break;
267 	case HCLK_SDIO:
268 	case SCLK_SDIO:
269 		rk_clrsetreg(&cru->cru_clksel_con[11],
270 			     MMC0_PLL_MASK | MMC0_DIV_MASK,
271 			     mux << MMC0_PLL_SHIFT |
272 			     (src_clk_div - 1) << MMC0_DIV_SHIFT);
273 		break;
274 	default:
275 		return -EINVAL;
276 	}
277 
278 	return rockchip_mmc_get_clk(cru, clk_general_rate, periph);
279 }
280 
281 static ulong rk3036_clk_get_rate(struct clk *clk)
282 {
283 	struct rk3036_clk_priv *priv = dev_get_priv(clk->dev);
284 
285 	switch (clk->id) {
286 	case 0 ... 63:
287 		return rkclk_pll_get_rate(priv->cru, clk->id);
288 	default:
289 		return -ENOENT;
290 	}
291 }
292 
293 static ulong rk3036_clk_set_rate(struct clk *clk, ulong rate)
294 {
295 	struct rk3036_clk_priv *priv = dev_get_priv(clk->dev);
296 	ulong new_rate, gclk_rate;
297 
298 	gclk_rate = rkclk_pll_get_rate(priv->cru, CLK_GENERAL);
299 	switch (clk->id) {
300 	case 0 ... 63:
301 		return 0;
302 	case HCLK_EMMC:
303 	case SCLK_EMMC:
304 		new_rate = rockchip_mmc_set_clk(priv->cru, gclk_rate,
305 						clk->id, rate);
306 		break;
307 	default:
308 		return -ENOENT;
309 	}
310 
311 	return new_rate;
312 }
313 
314 static struct clk_ops rk3036_clk_ops = {
315 	.get_rate	= rk3036_clk_get_rate,
316 	.set_rate	= rk3036_clk_set_rate,
317 };
318 
319 static int rk3036_clk_probe(struct udevice *dev)
320 {
321 	struct rk3036_clk_priv *priv = dev_get_priv(dev);
322 
323 	priv->cru = (struct rk3036_cru *)devfdt_get_addr(dev);
324 	rkclk_init(priv->cru);
325 
326 	return 0;
327 }
328 
329 static int rk3036_clk_bind(struct udevice *dev)
330 {
331 	int ret;
332 
333 	/* The reset driver does not have a device node, so bind it here */
334 	ret = device_bind_driver(gd->dm_root, "rk3036_sysreset", "reset", &dev);
335 	if (ret)
336 		debug("Warning: No RK3036 reset driver: ret=%d\n", ret);
337 
338 	return 0;
339 }
340 
341 static const struct udevice_id rk3036_clk_ids[] = {
342 	{ .compatible = "rockchip,rk3036-cru" },
343 	{ }
344 };
345 
346 U_BOOT_DRIVER(rockchip_rk3036_cru) = {
347 	.name		= "clk_rk3036",
348 	.id		= UCLASS_CLK,
349 	.of_match	= rk3036_clk_ids,
350 	.priv_auto_alloc_size = sizeof(struct rk3036_clk_priv),
351 	.ops		= &rk3036_clk_ops,
352 	.bind		= rk3036_clk_bind,
353 	.probe		= rk3036_clk_probe,
354 };
355