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1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * clock_am33xx.c
4  *
5  * clocks for AM33XX based boards
6  *
7  * Copyright (C) 2013, Texas Instruments, Incorporated - http://www.ti.com/
8  */
9 
10 #include <common.h>
11 #include <asm/arch/cpu.h>
12 #include <asm/arch/sys_proto.h>
13 #include <asm/arch/clock.h>
14 #include <asm/arch/hardware.h>
15 #include <asm/io.h>
16 
17 #define OSC	(V_OSCK/1000000)
18 
19 struct cm_perpll *const cmper = (struct cm_perpll *)CM_PER;
20 struct cm_wkuppll *const cmwkup = (struct cm_wkuppll *)CM_WKUP;
21 struct cm_dpll *const cmdpll = (struct cm_dpll *)CM_DPLL;
22 struct cm_rtc *const cmrtc = (struct cm_rtc *)CM_RTC;
23 
24 const struct dpll_regs dpll_mpu_regs = {
25 	.cm_clkmode_dpll	= CM_WKUP + 0x88,
26 	.cm_idlest_dpll		= CM_WKUP + 0x20,
27 	.cm_clksel_dpll		= CM_WKUP + 0x2C,
28 	.cm_div_m2_dpll		= CM_WKUP + 0xA8,
29 };
30 
31 const struct dpll_regs dpll_core_regs = {
32 	.cm_clkmode_dpll	= CM_WKUP + 0x90,
33 	.cm_idlest_dpll		= CM_WKUP + 0x5C,
34 	.cm_clksel_dpll		= CM_WKUP + 0x68,
35 	.cm_div_m4_dpll		= CM_WKUP + 0x80,
36 	.cm_div_m5_dpll		= CM_WKUP + 0x84,
37 	.cm_div_m6_dpll		= CM_WKUP + 0xD8,
38 };
39 
40 const struct dpll_regs dpll_per_regs = {
41 	.cm_clkmode_dpll	= CM_WKUP + 0x8C,
42 	.cm_idlest_dpll		= CM_WKUP + 0x70,
43 	.cm_clksel_dpll		= CM_WKUP + 0x9C,
44 	.cm_div_m2_dpll		= CM_WKUP + 0xAC,
45 };
46 
47 const struct dpll_regs dpll_ddr_regs = {
48 	.cm_clkmode_dpll	= CM_WKUP + 0x94,
49 	.cm_idlest_dpll		= CM_WKUP + 0x34,
50 	.cm_clksel_dpll		= CM_WKUP + 0x40,
51 	.cm_div_m2_dpll		= CM_WKUP + 0xA0,
52 };
53 
54 const struct dpll_regs dpll_disp_regs = {
55 	.cm_clkmode_dpll	= CM_WKUP + 0x98,
56 	.cm_idlest_dpll		= CM_WKUP + 0x48,
57 	.cm_clksel_dpll		= CM_WKUP + 0x54,
58 	.cm_div_m2_dpll		= CM_WKUP + 0xA4,
59 };
60 
61 struct dpll_params dpll_mpu_opp100 = {
62 		CONFIG_SYS_MPUCLK, OSC-1, 1, -1, -1, -1, -1};
63 const struct dpll_params dpll_core_opp100 = {
64 		1000, OSC-1, -1, -1, 10, 8, 4};
65 
66 const struct dpll_params dpll_mpu_opp[NUM_CRYSTAL_FREQ][NUM_OPPS] = {
67 	{	/* 19.2 MHz */
68 		{125, 3, 2, -1, -1, -1, -1},	/* OPP 50 */
69 		{-1, -1, -1, -1, -1, -1, -1},	/* OPP RESERVED	*/
70 		{125, 3, 1, -1, -1, -1, -1},	/* OPP 100 */
71 		{150, 3, 1, -1, -1, -1, -1},	/* OPP 120 */
72 		{125, 2, 1, -1, -1, -1, -1},	/* OPP TB */
73 		{625, 11, 1, -1, -1, -1, -1}	/* OPP NT */
74 	},
75 	{	/* 24 MHz */
76 		{25, 0, 2, -1, -1, -1, -1},	/* OPP 50 */
77 		{-1, -1, -1, -1, -1, -1, -1},	/* OPP RESERVED	*/
78 		{25, 0, 1, -1, -1, -1, -1},	/* OPP 100 */
79 		{30, 0, 1, -1, -1, -1, -1},	/* OPP 120 */
80 		{100, 3, 1, -1, -1, -1, -1},	/* OPP TB */
81 		{125, 2, 1, -1, -1, -1, -1}	/* OPP NT */
82 	},
83 	{	/* 25 MHz */
84 		{24, 0, 2, -1, -1, -1, -1},	/* OPP 50 */
85 		{-1, -1, -1, -1, -1, -1, -1},	/* OPP RESERVED	*/
86 		{24, 0, 1, -1, -1, -1, -1},	/* OPP 100 */
87 		{144, 4, 1, -1, -1, -1, -1},	/* OPP 120 */
88 		{32, 0, 1, -1, -1, -1, -1},	/* OPP TB */
89 		{40, 0, 1, -1, -1, -1, -1}	/* OPP NT */
90 	},
91 	{	/* 26 MHz */
92 		{300, 12, 2, -1, -1, -1, -1},	/* OPP 50 */
93 		{-1, -1, -1, -1, -1, -1, -1},	/* OPP RESERVED	*/
94 		{300, 12, 1, -1, -1, -1, -1},	/* OPP 100 */
95 		{360, 12, 1, -1, -1, -1, -1},	/* OPP 120 */
96 		{400, 12, 1, -1, -1, -1, -1},	/* OPP TB */
97 		{500, 12, 1, -1, -1, -1, -1}	/* OPP NT */
98 	},
99 };
100 
101 const struct dpll_params dpll_core_1000MHz[NUM_CRYSTAL_FREQ] = {
102 		{625, 11, -1, -1, 10, 8, 4},	/* 19.2 MHz */
103 		{125, 2, -1, -1, 10, 8, 4},	/* 24 MHz */
104 		{40, 0, -1, -1, 10, 8, 4},	/* 25 MHz */
105 		{500, 12, -1, -1, 10, 8, 4}	/* 26 MHz */
106 };
107 
108 const struct dpll_params dpll_per_192MHz[NUM_CRYSTAL_FREQ] = {
109 		{400, 7, 5, -1, -1, -1, -1},	/* 19.2 MHz */
110 		{400, 9, 5, -1, -1, -1, -1},	/* 24 MHz */
111 		{384, 9, 5, -1, -1, -1, -1},	/* 25 MHz */
112 		{480, 12, 5, -1, -1, -1, -1}	/* 26 MHz */
113 };
114 
115 const struct dpll_params dpll_ddr3_303MHz[NUM_CRYSTAL_FREQ] = {
116 		{505, 15, 2, -1, -1, -1, -1}, /*19.2*/
117 		{101, 3, 2, -1, -1, -1, -1}, /* 24 MHz */
118 		{303, 24, 1, -1, -1, -1, -1}, /* 25 MHz */
119 		{303, 12, 2, -1, -1, -1, -1}  /* 26 MHz */
120 };
121 
122 const struct dpll_params dpll_ddr3_400MHz[NUM_CRYSTAL_FREQ] = {
123 		{125, 5, 1, -1, -1, -1, -1}, /*19.2*/
124 		{50, 2, 1, -1, -1, -1, -1}, /* 24 MHz */
125 		{16, 0, 1, -1, -1, -1, -1}, /* 25 MHz */
126 		{200, 12, 1, -1, -1, -1, -1}  /* 26 MHz */
127 };
128 
129 const struct dpll_params dpll_ddr2_266MHz[NUM_CRYSTAL_FREQ] = {
130 		{665, 47, 1, -1, -1, -1, -1}, /*19.2*/
131 		{133, 11, 1, -1, -1, -1, -1}, /* 24 MHz */
132 		{266, 24, 1, -1, -1, -1, -1}, /* 25 MHz */
133 		{133, 12, 1, -1, -1, -1, -1}  /* 26 MHz */
134 };
135 
get_dpll_mpu_params(void)136 __weak const struct dpll_params *get_dpll_mpu_params(void)
137 {
138 	return &dpll_mpu_opp100;
139 }
140 
get_dpll_core_params(void)141 const struct dpll_params *get_dpll_core_params(void)
142 {
143 	int ind = get_sys_clk_index();
144 
145 	return &dpll_core_1000MHz[ind];
146 }
147 
get_dpll_per_params(void)148 const struct dpll_params *get_dpll_per_params(void)
149 {
150 	int ind = get_sys_clk_index();
151 
152 	return &dpll_per_192MHz[ind];
153 }
154 
setup_clocks_for_console(void)155 void setup_clocks_for_console(void)
156 {
157 	clrsetbits_le32(&cmwkup->wkclkstctrl, CD_CLKCTRL_CLKTRCTRL_MASK,
158 			CD_CLKCTRL_CLKTRCTRL_SW_WKUP <<
159 			CD_CLKCTRL_CLKTRCTRL_SHIFT);
160 
161 	clrsetbits_le32(&cmper->l4hsclkstctrl, CD_CLKCTRL_CLKTRCTRL_MASK,
162 			CD_CLKCTRL_CLKTRCTRL_SW_WKUP <<
163 			CD_CLKCTRL_CLKTRCTRL_SHIFT);
164 
165 	clrsetbits_le32(&cmwkup->wkup_uart0ctrl,
166 			MODULE_CLKCTRL_MODULEMODE_MASK,
167 			MODULE_CLKCTRL_MODULEMODE_SW_EXPLICIT_EN <<
168 			MODULE_CLKCTRL_MODULEMODE_SHIFT);
169 	clrsetbits_le32(&cmper->uart1clkctrl,
170 			MODULE_CLKCTRL_MODULEMODE_MASK,
171 			MODULE_CLKCTRL_MODULEMODE_SW_EXPLICIT_EN <<
172 			MODULE_CLKCTRL_MODULEMODE_SHIFT);
173 	clrsetbits_le32(&cmper->uart2clkctrl,
174 			MODULE_CLKCTRL_MODULEMODE_MASK,
175 			MODULE_CLKCTRL_MODULEMODE_SW_EXPLICIT_EN <<
176 			MODULE_CLKCTRL_MODULEMODE_SHIFT);
177 	clrsetbits_le32(&cmper->uart3clkctrl,
178 			MODULE_CLKCTRL_MODULEMODE_MASK,
179 			MODULE_CLKCTRL_MODULEMODE_SW_EXPLICIT_EN <<
180 			MODULE_CLKCTRL_MODULEMODE_SHIFT);
181 	clrsetbits_le32(&cmper->uart4clkctrl,
182 			MODULE_CLKCTRL_MODULEMODE_MASK,
183 			MODULE_CLKCTRL_MODULEMODE_SW_EXPLICIT_EN <<
184 			MODULE_CLKCTRL_MODULEMODE_SHIFT);
185 	clrsetbits_le32(&cmper->uart5clkctrl,
186 			MODULE_CLKCTRL_MODULEMODE_MASK,
187 			MODULE_CLKCTRL_MODULEMODE_SW_EXPLICIT_EN <<
188 			MODULE_CLKCTRL_MODULEMODE_SHIFT);
189 }
190 
enable_basic_clocks(void)191 void enable_basic_clocks(void)
192 {
193 	u32 *const clk_domains[] = {
194 		&cmper->l3clkstctrl,
195 		&cmper->l4fwclkstctrl,
196 		&cmper->l3sclkstctrl,
197 		&cmper->l4lsclkstctrl,
198 		&cmwkup->wkclkstctrl,
199 		&cmper->emiffwclkctrl,
200 		&cmrtc->clkstctrl,
201 		0
202 	};
203 
204 	u32 *const clk_modules_explicit_en[] = {
205 		&cmper->l3clkctrl,
206 		&cmper->l4lsclkctrl,
207 		&cmper->l4fwclkctrl,
208 		&cmwkup->wkl4wkclkctrl,
209 		&cmper->l3instrclkctrl,
210 		&cmper->l4hsclkctrl,
211 		&cmwkup->wkgpio0clkctrl,
212 		&cmwkup->wkctrlclkctrl,
213 		&cmper->timer2clkctrl,
214 		&cmper->gpmcclkctrl,
215 		&cmper->elmclkctrl,
216 		&cmper->mmc0clkctrl,
217 		&cmper->mmc1clkctrl,
218 		&cmwkup->wkup_i2c0ctrl,
219 		&cmper->gpio1clkctrl,
220 		&cmper->gpio2clkctrl,
221 		&cmper->gpio3clkctrl,
222 		&cmper->i2c1clkctrl,
223 		&cmper->cpgmac0clkctrl,
224 		&cmper->spi0clkctrl,
225 		&cmrtc->rtcclkctrl,
226 		&cmper->usb0clkctrl,
227 		&cmper->emiffwclkctrl,
228 		&cmper->emifclkctrl,
229 		0
230 	};
231 
232 	do_enable_clocks(clk_domains, clk_modules_explicit_en, 1);
233 
234 	/* Select the Master osc 24 MHZ as Timer2 clock source */
235 	writel(0x1, &cmdpll->clktimer2clk);
236 }
237 
238 /*
239  * Enable Spread Spectrum for the MPU by calculating the required
240  * values and setting the registers accordingly.
241  * @param permille The spreading in permille (10th of a percent)
242  */
set_mpu_spreadspectrum(int permille)243 void set_mpu_spreadspectrum(int permille)
244 {
245 	u32 multiplier_m;
246 	u32 predivider_n;
247 	u32 cm_clksel_dpll_mpu;
248 	u32 cm_clkmode_dpll_mpu;
249 	u32 ref_clock;
250 	u32 pll_bandwidth;
251 	u32 mod_freq_divider;
252 	u32 exponent;
253 	u32 mantissa;
254 	u32 delta_m_step;
255 
256 	printf("Enabling Spread Spectrum of %d permille for MPU\n",
257 	       permille);
258 
259 	/* Read PLL parameter m and n */
260 	cm_clksel_dpll_mpu = readl(&cmwkup->clkseldpllmpu);
261 	multiplier_m = (cm_clksel_dpll_mpu >> 8) & 0x3FF;
262 	predivider_n = cm_clksel_dpll_mpu & 0x7F;
263 
264 	/*
265 	 * Calculate reference clock (clock after pre-divider),
266 	 * its max. PLL bandwidth,
267 	 * and resulting mod_freq_divider
268 	 */
269 	ref_clock = V_OSCK / (predivider_n + 1);
270 	pll_bandwidth = ref_clock / 70;
271 	mod_freq_divider = ref_clock / (4 * pll_bandwidth);
272 
273 	/* Calculate Mantissa/Exponent */
274 	exponent = 0;
275 	mantissa = mod_freq_divider;
276 	while ((mantissa > 127) && (exponent < 7)) {
277 		exponent++;
278 		mantissa /= 2;
279 	}
280 	if (mantissa > 127)
281 		mantissa = 127;
282 
283 	mod_freq_divider = mantissa << exponent;
284 
285 	/*
286 	 * Calculate Modulation steps
287 	 * As we use Downspread only, the spread is twice the value of
288 	 * permille, so Div2!
289 	 * As it takes the value in percent, divide by ten!
290 	 */
291 	delta_m_step = ((u32)((multiplier_m * permille) / 10 / 2)) << 18;
292 	delta_m_step /= 100;
293 	delta_m_step /= mod_freq_divider;
294 	if (delta_m_step > 0xFFFFF)
295 		delta_m_step = 0xFFFFF;
296 
297 	/* Setup Spread Spectrum */
298 	writel(delta_m_step, &cmwkup->sscdeltamstepdllmpu);
299 	writel((exponent << 8) | mantissa, &cmwkup->sscmodfreqdivdpllmpu);
300 	cm_clkmode_dpll_mpu = readl(&cmwkup->clkmoddpllmpu);
301 	/* clear all SSC flags */
302 	cm_clkmode_dpll_mpu &= ~(0xF << CM_CLKMODE_DPLL_SSC_EN_SHIFT);
303 	/* enable SSC with Downspread only */
304 	cm_clkmode_dpll_mpu |=  CM_CLKMODE_DPLL_SSC_EN_MASK |
305 				CM_CLKMODE_DPLL_SSC_DOWNSPREAD_MASK;
306 	writel(cm_clkmode_dpll_mpu, &cmwkup->clkmoddpllmpu);
307 	while (!(readl(&cmwkup->clkmoddpllmpu) & 0x2000))
308 		;
309 }
310