xref: /openbmc/linux/drivers/clk/pxa/clk-pxa25x.c (revision a06c488d)
1 /*
2  * Marvell PXA25x family clocks
3  *
4  * Copyright (C) 2014 Robert Jarzmik
5  *
6  * Heavily inspired from former arch/arm/mach-pxa/pxa25x.c.
7  *
8  * This program is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU General Public License as published by
10  * the Free Software Foundation; version 2 of the License.
11  *
12  * For non-devicetree platforms. Once pxa is fully converted to devicetree, this
13  * should go away.
14  */
15 #include <linux/clk-provider.h>
16 #include <linux/clk.h>
17 #include <linux/clkdev.h>
18 #include <linux/io.h>
19 #include <linux/of.h>
20 #include <mach/pxa2xx-regs.h>
21 
22 #include <dt-bindings/clock/pxa-clock.h>
23 #include "clk-pxa.h"
24 
25 #define KHz 1000
26 #define MHz (1000 * 1000)
27 
28 enum {
29 	PXA_CORE_RUN = 0,
30 	PXA_CORE_TURBO,
31 };
32 
33 /*
34  * Various clock factors driven by the CCCR register.
35  */
36 
37 /* Crystal Frequency to Memory Frequency Multiplier (L) */
38 static unsigned char L_clk_mult[32] = { 0, 27, 32, 36, 40, 45, 0, };
39 
40 /* Memory Frequency to Run Mode Frequency Multiplier (M) */
41 static unsigned char M_clk_mult[4] = { 0, 1, 2, 4 };
42 
43 /* Run Mode Frequency to Turbo Mode Frequency Multiplier (N) */
44 /* Note: we store the value N * 2 here. */
45 static unsigned char N2_clk_mult[8] = { 0, 0, 2, 3, 4, 0, 6, 0 };
46 
47 static const char * const get_freq_khz[] = {
48 	"core", "run", "cpll", "memory"
49 };
50 
51 /*
52  * Get the clock frequency as reflected by CCCR and the turbo flag.
53  * We assume these values have been applied via a fcs.
54  * If info is not 0 we also display the current settings.
55  */
56 unsigned int pxa25x_get_clk_frequency_khz(int info)
57 {
58 	struct clk *clk;
59 	unsigned long clks[5];
60 	int i;
61 
62 	for (i = 0; i < ARRAY_SIZE(get_freq_khz); i++) {
63 		clk = clk_get(NULL, get_freq_khz[i]);
64 		if (IS_ERR(clk)) {
65 			clks[i] = 0;
66 		} else {
67 			clks[i] = clk_get_rate(clk);
68 			clk_put(clk);
69 		}
70 	}
71 
72 	if (info) {
73 		pr_info("Run Mode clock: %ld.%02ldMHz\n",
74 			clks[1] / 1000000, (clks[1] % 1000000) / 10000);
75 		pr_info("Turbo Mode clock: %ld.%02ldMHz\n",
76 			clks[2] / 1000000, (clks[2] % 1000000) / 10000);
77 		pr_info("Memory clock: %ld.%02ldMHz\n",
78 			clks[3] / 1000000, (clks[3] % 1000000) / 10000);
79 	}
80 
81 	return (unsigned int)clks[0] / KHz;
82 }
83 
84 static unsigned long clk_pxa25x_memory_get_rate(struct clk_hw *hw,
85 						unsigned long parent_rate)
86 {
87 	unsigned long cccr = CCCR;
88 	unsigned int m = M_clk_mult[(cccr >> 5) & 0x03];
89 
90 	return parent_rate / m;
91 }
92 PARENTS(clk_pxa25x_memory) = { "run" };
93 RATE_RO_OPS(clk_pxa25x_memory, "memory");
94 
95 PARENTS(pxa25x_pbus95) = { "ppll_95_85mhz", "ppll_95_85mhz" };
96 PARENTS(pxa25x_pbus147) = { "ppll_147_46mhz", "ppll_147_46mhz" };
97 PARENTS(pxa25x_osc3) = { "osc_3_6864mhz", "osc_3_6864mhz" };
98 
99 #define PXA25X_CKEN(dev_id, con_id, parents, mult, div,			\
100 		    bit, is_lp, flags)					\
101 	PXA_CKEN(dev_id, con_id, bit, parents, mult, div, mult, div,	\
102 		 is_lp,  &CKEN, CKEN_ ## bit, flags)
103 #define PXA25X_PBUS95_CKEN(dev_id, con_id, bit, mult_hp, div_hp, delay)	\
104 	PXA25X_CKEN(dev_id, con_id, pxa25x_pbus95_parents, mult_hp,	\
105 		    div_hp, bit, NULL, 0)
106 #define PXA25X_PBUS147_CKEN(dev_id, con_id, bit, mult_hp, div_hp, delay)\
107 	PXA25X_CKEN(dev_id, con_id, pxa25x_pbus147_parents, mult_hp,	\
108 		    div_hp, bit, NULL, 0)
109 #define PXA25X_OSC3_CKEN(dev_id, con_id, bit, mult_hp, div_hp, delay)	\
110 	PXA25X_CKEN(dev_id, con_id, pxa25x_osc3_parents, mult_hp,	\
111 		    div_hp, bit, NULL, 0)
112 
113 #define PXA25X_CKEN_1RATE(dev_id, con_id, bit, parents, delay)		\
114 	PXA_CKEN_1RATE(dev_id, con_id, bit, parents,			\
115 		       &CKEN, CKEN_ ## bit, 0)
116 #define PXA25X_CKEN_1RATE_AO(dev_id, con_id, bit, parents, delay)	\
117 	PXA_CKEN_1RATE(dev_id, con_id, bit, parents,			\
118 		       &CKEN, CKEN_ ## bit, CLK_IGNORE_UNUSED)
119 
120 static struct desc_clk_cken pxa25x_clocks[] __initdata = {
121 	PXA25X_PBUS95_CKEN("pxa2xx-mci.0", NULL, MMC, 1, 5, 0),
122 	PXA25X_PBUS95_CKEN("pxa2xx-i2c.0", NULL, I2C, 1, 3, 0),
123 	PXA25X_PBUS95_CKEN("pxa2xx-ir", "FICPCLK", FICP, 1, 2, 0),
124 	PXA25X_PBUS95_CKEN("pxa25x-udc", NULL, USB, 1, 2, 5),
125 	PXA25X_PBUS147_CKEN("pxa2xx-uart.0", NULL, FFUART, 1, 10, 1),
126 	PXA25X_PBUS147_CKEN("pxa2xx-uart.1", NULL, BTUART, 1, 10, 1),
127 	PXA25X_PBUS147_CKEN("pxa2xx-uart.2", NULL, STUART, 1, 10, 1),
128 	PXA25X_PBUS147_CKEN("pxa2xx-uart.3", NULL, HWUART, 1, 10, 1),
129 	PXA25X_PBUS147_CKEN("pxa2xx-i2s", NULL, I2S, 1, 10, 0),
130 	PXA25X_PBUS147_CKEN(NULL, "AC97CLK", AC97, 1, 12, 0),
131 	PXA25X_OSC3_CKEN("pxa25x-ssp.0", NULL, SSP, 1, 1, 0),
132 	PXA25X_OSC3_CKEN("pxa25x-nssp.1", NULL, NSSP, 1, 1, 0),
133 	PXA25X_OSC3_CKEN("pxa25x-nssp.2", NULL, ASSP, 1, 1, 0),
134 	PXA25X_OSC3_CKEN("pxa25x-pwm.0", NULL, PWM0, 1, 1, 0),
135 	PXA25X_OSC3_CKEN("pxa25x-pwm.1", NULL, PWM1, 1, 1, 0),
136 
137 	PXA25X_CKEN_1RATE("pxa2xx-fb", NULL, LCD, clk_pxa25x_memory_parents, 0),
138 	PXA25X_CKEN_1RATE_AO("pxa2xx-pcmcia", NULL, MEMC,
139 			     clk_pxa25x_memory_parents, 0),
140 };
141 
142 static u8 clk_pxa25x_core_get_parent(struct clk_hw *hw)
143 {
144 	unsigned long clkcfg;
145 	unsigned int t;
146 
147 	asm("mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg));
148 	t  = clkcfg & (1 << 0);
149 	if (t)
150 		return PXA_CORE_TURBO;
151 	return PXA_CORE_RUN;
152 }
153 
154 static unsigned long clk_pxa25x_core_get_rate(struct clk_hw *hw,
155 					      unsigned long parent_rate)
156 {
157 	return parent_rate;
158 }
159 PARENTS(clk_pxa25x_core) = { "run", "cpll" };
160 MUX_RO_RATE_RO_OPS(clk_pxa25x_core, "core");
161 
162 static unsigned long clk_pxa25x_run_get_rate(struct clk_hw *hw,
163 					     unsigned long parent_rate)
164 {
165 	unsigned long cccr = CCCR;
166 	unsigned int n2 = N2_clk_mult[(cccr >> 7) & 0x07];
167 
168 	return (parent_rate / n2) * 2;
169 }
170 PARENTS(clk_pxa25x_run) = { "cpll" };
171 RATE_RO_OPS(clk_pxa25x_run, "run");
172 
173 static unsigned long clk_pxa25x_cpll_get_rate(struct clk_hw *hw,
174 	unsigned long parent_rate)
175 {
176 	unsigned long clkcfg, cccr = CCCR;
177 	unsigned int l, m, n2, t;
178 
179 	asm("mrc\tp14, 0, %0, c6, c0, 0" : "=r" (clkcfg));
180 	t = clkcfg & (1 << 0);
181 	l  =  L_clk_mult[(cccr >> 0) & 0x1f];
182 	m = M_clk_mult[(cccr >> 5) & 0x03];
183 	n2 = N2_clk_mult[(cccr >> 7) & 0x07];
184 
185 	if (t)
186 		return m * l * n2 * parent_rate / 2;
187 	return m * l * parent_rate;
188 }
189 PARENTS(clk_pxa25x_cpll) = { "osc_3_6864mhz" };
190 RATE_RO_OPS(clk_pxa25x_cpll, "cpll");
191 
192 static void __init pxa25x_register_core(void)
193 {
194 	clk_register_clk_pxa25x_cpll();
195 	clk_register_clk_pxa25x_run();
196 	clkdev_pxa_register(CLK_CORE, "core", NULL,
197 			    clk_register_clk_pxa25x_core());
198 }
199 
200 static void __init pxa25x_register_plls(void)
201 {
202 	clk_register_fixed_rate(NULL, "osc_3_6864mhz", NULL,
203 				CLK_GET_RATE_NOCACHE | CLK_IS_ROOT,
204 				3686400);
205 	clk_register_fixed_rate(NULL, "osc_32_768khz", NULL,
206 				CLK_GET_RATE_NOCACHE | CLK_IS_ROOT,
207 				32768);
208 	clk_register_fixed_rate(NULL, "clk_dummy", NULL, CLK_IS_ROOT, 0);
209 	clk_register_fixed_factor(NULL, "ppll_95_85mhz", "osc_3_6864mhz",
210 				  0, 26, 1);
211 	clk_register_fixed_factor(NULL, "ppll_147_46mhz", "osc_3_6864mhz",
212 				  0, 40, 1);
213 }
214 
215 static void __init pxa25x_base_clocks_init(void)
216 {
217 	pxa25x_register_plls();
218 	pxa25x_register_core();
219 	clk_register_clk_pxa25x_memory();
220 }
221 
222 #define DUMMY_CLK(_con_id, _dev_id, _parent) \
223 	{ .con_id = _con_id, .dev_id = _dev_id, .parent = _parent }
224 struct dummy_clk {
225 	const char *con_id;
226 	const char *dev_id;
227 	const char *parent;
228 };
229 static struct dummy_clk dummy_clks[] __initdata = {
230 	DUMMY_CLK(NULL, "pxa25x-gpio", "osc_32_768khz"),
231 	DUMMY_CLK(NULL, "pxa26x-gpio", "osc_32_768khz"),
232 	DUMMY_CLK("GPIO11_CLK", NULL, "osc_3_6864mhz"),
233 	DUMMY_CLK("GPIO12_CLK", NULL, "osc_32_768khz"),
234 	DUMMY_CLK(NULL, "sa1100-rtc", "osc_32_768khz"),
235 	DUMMY_CLK("OSTIMER0", NULL, "osc_32_768khz"),
236 	DUMMY_CLK("UARTCLK", "pxa2xx-ir", "STUART"),
237 };
238 
239 static void __init pxa25x_dummy_clocks_init(void)
240 {
241 	struct clk *clk;
242 	struct dummy_clk *d;
243 	const char *name;
244 	int i;
245 
246 	/*
247 	 * All pinctrl logic has been wiped out of the clock driver, especially
248 	 * for gpio11 and gpio12 outputs. Machine code should ensure proper pin
249 	 * control (ie. pxa2xx_mfp_config() invocation).
250 	 */
251 	for (i = 0; i < ARRAY_SIZE(dummy_clks); i++) {
252 		d = &dummy_clks[i];
253 		name = d->dev_id ? d->dev_id : d->con_id;
254 		clk = clk_register_fixed_factor(NULL, name, d->parent, 0, 1, 1);
255 		clk_register_clkdev(clk, d->con_id, d->dev_id);
256 	}
257 }
258 
259 int __init pxa25x_clocks_init(void)
260 {
261 	pxa25x_base_clocks_init();
262 	pxa25x_dummy_clocks_init();
263 	return clk_pxa_cken_init(pxa25x_clocks, ARRAY_SIZE(pxa25x_clocks));
264 }
265 
266 static void __init pxa25x_dt_clocks_init(struct device_node *np)
267 {
268 	pxa25x_clocks_init();
269 	clk_pxa_dt_common_init(np);
270 }
271 CLK_OF_DECLARE(pxa25x_clks, "marvell,pxa250-core-clocks",
272 	       pxa25x_dt_clocks_init);
273