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b886d83c | 1 | // SPDX-License-Identifier: GPL-2.0-only |
9bbb8a33 RJ |
2 | /* |
3 | * Marvell PXA3xxx family clocks | |
4 | * | |
5 | * Copyright (C) 2014 Robert Jarzmik | |
6 | * | |
7 | * Heavily inspired from former arch/arm/mach-pxa/pxa3xx.c | |
8 | * | |
9bbb8a33 RJ |
9 | * For non-devicetree platforms. Once pxa is fully converted to devicetree, this |
10 | * should go away. | |
11 | */ | |
12 | #include <linux/io.h> | |
13 | #include <linux/clk.h> | |
14 | #include <linux/clk-provider.h> | |
15 | #include <linux/clkdev.h> | |
16 | #include <linux/of.h> | |
17 | #include <mach/smemc.h> | |
18 | #include <mach/pxa3xx-regs.h> | |
19 | ||
20 | #include <dt-bindings/clock/pxa-clock.h> | |
21 | #include "clk-pxa.h" | |
22 | ||
23 | #define KHz 1000 | |
24 | #define MHz (1000 * 1000) | |
25 | ||
26 | enum { | |
27 | PXA_CORE_60Mhz = 0, | |
28 | PXA_CORE_RUN, | |
29 | PXA_CORE_TURBO, | |
30 | }; | |
31 | ||
32 | enum { | |
33 | PXA_BUS_60Mhz = 0, | |
34 | PXA_BUS_HSS, | |
35 | }; | |
36 | ||
37 | /* crystal frequency to HSIO bus frequency multiplier (HSS) */ | |
38 | static unsigned char hss_mult[4] = { 8, 12, 16, 24 }; | |
39 | ||
40 | /* crystal frequency to static memory controller multiplier (SMCFS) */ | |
41 | static unsigned int smcfs_mult[8] = { 6, 0, 8, 0, 0, 16, }; | |
42 | static unsigned int df_clkdiv[4] = { 1, 2, 4, 1 }; | |
43 | ||
44 | static const char * const get_freq_khz[] = { | |
45 | "core", "ring_osc_60mhz", "run", "cpll", "system_bus" | |
46 | }; | |
47 | ||
48 | /* | |
49 | * Get the clock frequency as reflected by ACSR and the turbo flag. | |
50 | * We assume these values have been applied via a fcs. | |
51 | * If info is not 0 we also display the current settings. | |
52 | */ | |
53 | unsigned int pxa3xx_get_clk_frequency_khz(int info) | |
54 | { | |
55 | struct clk *clk; | |
56 | unsigned long clks[5]; | |
57 | int i; | |
58 | ||
59 | for (i = 0; i < 5; i++) { | |
60 | clk = clk_get(NULL, get_freq_khz[i]); | |
61 | if (IS_ERR(clk)) { | |
62 | clks[i] = 0; | |
63 | } else { | |
64 | clks[i] = clk_get_rate(clk); | |
65 | clk_put(clk); | |
66 | } | |
67 | } | |
68 | if (info) { | |
69 | pr_info("RO Mode clock: %ld.%02ldMHz\n", | |
70 | clks[1] / 1000000, (clks[0] % 1000000) / 10000); | |
71 | pr_info("Run Mode clock: %ld.%02ldMHz\n", | |
72 | clks[2] / 1000000, (clks[1] % 1000000) / 10000); | |
73 | pr_info("Turbo Mode clock: %ld.%02ldMHz\n", | |
74 | clks[3] / 1000000, (clks[2] % 1000000) / 10000); | |
75 | pr_info("System bus clock: %ld.%02ldMHz\n", | |
76 | clks[4] / 1000000, (clks[4] % 1000000) / 10000); | |
77 | } | |
4b5fb7dc | 78 | return (unsigned int)clks[0] / KHz; |
9bbb8a33 RJ |
79 | } |
80 | ||
81 | static unsigned long clk_pxa3xx_ac97_get_rate(struct clk_hw *hw, | |
82 | unsigned long parent_rate) | |
83 | { | |
84 | unsigned long ac97_div, rate; | |
85 | ||
86 | ac97_div = AC97_DIV; | |
87 | ||
88 | /* This may loose precision for some rates but won't for the | |
89 | * standard 24.576MHz. | |
90 | */ | |
91 | rate = parent_rate / 2; | |
92 | rate /= ((ac97_div >> 12) & 0x7fff); | |
93 | rate *= (ac97_div & 0xfff); | |
94 | ||
95 | return rate; | |
96 | } | |
97 | PARENTS(clk_pxa3xx_ac97) = { "spll_624mhz" }; | |
98 | RATE_RO_OPS(clk_pxa3xx_ac97, "ac97"); | |
99 | ||
100 | static unsigned long clk_pxa3xx_smemc_get_rate(struct clk_hw *hw, | |
101 | unsigned long parent_rate) | |
102 | { | |
103 | unsigned long acsr = ACSR; | |
104 | unsigned long memclkcfg = __raw_readl(MEMCLKCFG); | |
105 | ||
106 | return (parent_rate / 48) * smcfs_mult[(acsr >> 23) & 0x7] / | |
107 | df_clkdiv[(memclkcfg >> 16) & 0x3]; | |
108 | } | |
109 | PARENTS(clk_pxa3xx_smemc) = { "spll_624mhz" }; | |
110 | RATE_RO_OPS(clk_pxa3xx_smemc, "smemc"); | |
111 | ||
112 | static bool pxa3xx_is_ring_osc_forced(void) | |
113 | { | |
114 | unsigned long acsr = ACSR; | |
115 | ||
116 | return acsr & ACCR_D0CS; | |
117 | } | |
118 | ||
119 | PARENTS(pxa3xx_pbus) = { "ring_osc_60mhz", "spll_624mhz" }; | |
120 | PARENTS(pxa3xx_32Khz_bus) = { "osc_32_768khz", "osc_32_768khz" }; | |
121 | PARENTS(pxa3xx_13MHz_bus) = { "osc_13mhz", "osc_13mhz" }; | |
122 | PARENTS(pxa3xx_ac97_bus) = { "ring_osc_60mhz", "ac97" }; | |
123 | PARENTS(pxa3xx_sbus) = { "ring_osc_60mhz", "system_bus" }; | |
124 | PARENTS(pxa3xx_smemcbus) = { "ring_osc_60mhz", "smemc" }; | |
125 | ||
b93028c9 | 126 | #define CKEN_AB(bit) ((CKEN_ ## bit > 31) ? &CKENB : &CKENA) |
9bbb8a33 RJ |
127 | #define PXA3XX_CKEN(dev_id, con_id, parents, mult_lp, div_lp, mult_hp, \ |
128 | div_hp, bit, is_lp, flags) \ | |
129 | PXA_CKEN(dev_id, con_id, bit, parents, mult_lp, div_lp, \ | |
130 | mult_hp, div_hp, is_lp, CKEN_AB(bit), \ | |
131 | (CKEN_ ## bit % 32), flags) | |
132 | #define PXA3XX_PBUS_CKEN(dev_id, con_id, bit, mult_lp, div_lp, \ | |
133 | mult_hp, div_hp, delay) \ | |
134 | PXA3XX_CKEN(dev_id, con_id, pxa3xx_pbus_parents, mult_lp, \ | |
135 | div_lp, mult_hp, div_hp, bit, pxa3xx_is_ring_osc_forced, 0) | |
136 | #define PXA3XX_CKEN_1RATE(dev_id, con_id, bit, parents) \ | |
137 | PXA_CKEN_1RATE(dev_id, con_id, bit, parents, \ | |
138 | CKEN_AB(bit), (CKEN_ ## bit % 32), 0) | |
139 | ||
140 | static struct desc_clk_cken pxa3xx_clocks[] __initdata = { | |
141 | PXA3XX_PBUS_CKEN("pxa2xx-uart.0", NULL, FFUART, 1, 4, 1, 42, 1), | |
142 | PXA3XX_PBUS_CKEN("pxa2xx-uart.1", NULL, BTUART, 1, 4, 1, 42, 1), | |
143 | PXA3XX_PBUS_CKEN("pxa2xx-uart.2", NULL, STUART, 1, 4, 1, 42, 1), | |
144 | PXA3XX_PBUS_CKEN("pxa2xx-i2c.0", NULL, I2C, 2, 5, 1, 19, 0), | |
145 | PXA3XX_PBUS_CKEN("pxa27x-udc", NULL, UDC, 1, 4, 1, 13, 5), | |
146 | PXA3XX_PBUS_CKEN("pxa27x-ohci", NULL, USBH, 1, 4, 1, 13, 0), | |
147 | PXA3XX_PBUS_CKEN("pxa3xx-u2d", NULL, USB2, 1, 4, 1, 13, 0), | |
148 | PXA3XX_PBUS_CKEN("pxa27x-pwm.0", NULL, PWM0, 1, 6, 1, 48, 0), | |
149 | PXA3XX_PBUS_CKEN("pxa27x-pwm.1", NULL, PWM1, 1, 6, 1, 48, 0), | |
150 | PXA3XX_PBUS_CKEN("pxa2xx-mci.0", NULL, MMC1, 1, 4, 1, 24, 0), | |
151 | PXA3XX_PBUS_CKEN("pxa2xx-mci.1", NULL, MMC2, 1, 4, 1, 24, 0), | |
152 | PXA3XX_PBUS_CKEN("pxa2xx-mci.2", NULL, MMC3, 1, 4, 1, 24, 0), | |
153 | ||
154 | PXA3XX_CKEN_1RATE("pxa27x-keypad", NULL, KEYPAD, | |
155 | pxa3xx_32Khz_bus_parents), | |
156 | PXA3XX_CKEN_1RATE("pxa3xx-ssp.0", NULL, SSP1, pxa3xx_13MHz_bus_parents), | |
157 | PXA3XX_CKEN_1RATE("pxa3xx-ssp.1", NULL, SSP2, pxa3xx_13MHz_bus_parents), | |
158 | PXA3XX_CKEN_1RATE("pxa3xx-ssp.2", NULL, SSP3, pxa3xx_13MHz_bus_parents), | |
159 | PXA3XX_CKEN_1RATE("pxa3xx-ssp.3", NULL, SSP4, pxa3xx_13MHz_bus_parents), | |
160 | ||
161 | PXA3XX_CKEN(NULL, "AC97CLK", pxa3xx_ac97_bus_parents, 1, 4, 1, 1, AC97, | |
162 | pxa3xx_is_ring_osc_forced, 0), | |
163 | PXA3XX_CKEN(NULL, "CAMCLK", pxa3xx_sbus_parents, 1, 2, 1, 1, CAMERA, | |
164 | pxa3xx_is_ring_osc_forced, 0), | |
165 | PXA3XX_CKEN("pxa2xx-fb", NULL, pxa3xx_sbus_parents, 1, 1, 1, 1, LCD, | |
166 | pxa3xx_is_ring_osc_forced, 0), | |
167 | PXA3XX_CKEN("pxa2xx-pcmcia", NULL, pxa3xx_smemcbus_parents, 1, 4, | |
168 | 1, 1, SMC, pxa3xx_is_ring_osc_forced, CLK_IGNORE_UNUSED), | |
169 | }; | |
170 | ||
171 | static struct desc_clk_cken pxa300_310_clocks[] __initdata = { | |
172 | ||
173 | PXA3XX_PBUS_CKEN("pxa3xx-gcu", NULL, PXA300_GCU, 1, 1, 1, 1, 0), | |
174 | PXA3XX_PBUS_CKEN("pxa3xx-nand", NULL, NAND, 1, 2, 1, 4, 0), | |
175 | PXA3XX_CKEN_1RATE("pxa3xx-gpio", NULL, GPIO, pxa3xx_13MHz_bus_parents), | |
176 | }; | |
177 | ||
178 | static struct desc_clk_cken pxa320_clocks[] __initdata = { | |
179 | PXA3XX_PBUS_CKEN("pxa3xx-nand", NULL, NAND, 1, 2, 1, 6, 0), | |
180 | PXA3XX_PBUS_CKEN("pxa3xx-gcu", NULL, PXA320_GCU, 1, 1, 1, 1, 0), | |
181 | PXA3XX_CKEN_1RATE("pxa3xx-gpio", NULL, GPIO, pxa3xx_13MHz_bus_parents), | |
182 | }; | |
183 | ||
184 | static struct desc_clk_cken pxa93x_clocks[] __initdata = { | |
185 | ||
186 | PXA3XX_PBUS_CKEN("pxa3xx-gcu", NULL, PXA300_GCU, 1, 1, 1, 1, 0), | |
187 | PXA3XX_PBUS_CKEN("pxa3xx-nand", NULL, NAND, 1, 2, 1, 4, 0), | |
188 | PXA3XX_CKEN_1RATE("pxa93x-gpio", NULL, GPIO, pxa3xx_13MHz_bus_parents), | |
189 | }; | |
190 | ||
191 | static unsigned long clk_pxa3xx_system_bus_get_rate(struct clk_hw *hw, | |
192 | unsigned long parent_rate) | |
193 | { | |
194 | unsigned long acsr = ACSR; | |
195 | unsigned int hss = (acsr >> 14) & 0x3; | |
196 | ||
197 | if (pxa3xx_is_ring_osc_forced()) | |
198 | return parent_rate; | |
199 | return parent_rate / 48 * hss_mult[hss]; | |
200 | } | |
201 | ||
202 | static u8 clk_pxa3xx_system_bus_get_parent(struct clk_hw *hw) | |
203 | { | |
204 | if (pxa3xx_is_ring_osc_forced()) | |
205 | return PXA_BUS_60Mhz; | |
206 | else | |
207 | return PXA_BUS_HSS; | |
208 | } | |
209 | ||
210 | PARENTS(clk_pxa3xx_system_bus) = { "ring_osc_60mhz", "spll_624mhz" }; | |
211 | MUX_RO_RATE_RO_OPS(clk_pxa3xx_system_bus, "system_bus"); | |
212 | ||
213 | static unsigned long clk_pxa3xx_core_get_rate(struct clk_hw *hw, | |
214 | unsigned long parent_rate) | |
215 | { | |
216 | return parent_rate; | |
217 | } | |
218 | ||
219 | static u8 clk_pxa3xx_core_get_parent(struct clk_hw *hw) | |
220 | { | |
221 | unsigned long xclkcfg; | |
222 | unsigned int t; | |
223 | ||
224 | if (pxa3xx_is_ring_osc_forced()) | |
225 | return PXA_CORE_60Mhz; | |
226 | ||
227 | /* Read XCLKCFG register turbo bit */ | |
228 | __asm__ __volatile__("mrc\tp14, 0, %0, c6, c0, 0" : "=r"(xclkcfg)); | |
229 | t = xclkcfg & 0x1; | |
230 | ||
231 | if (t) | |
232 | return PXA_CORE_TURBO; | |
233 | return PXA_CORE_RUN; | |
234 | } | |
235 | PARENTS(clk_pxa3xx_core) = { "ring_osc_60mhz", "run", "cpll" }; | |
236 | MUX_RO_RATE_RO_OPS(clk_pxa3xx_core, "core"); | |
237 | ||
238 | static unsigned long clk_pxa3xx_run_get_rate(struct clk_hw *hw, | |
239 | unsigned long parent_rate) | |
240 | { | |
241 | unsigned long acsr = ACSR; | |
242 | unsigned int xn = (acsr & ACCR_XN_MASK) >> 8; | |
243 | unsigned int t, xclkcfg; | |
244 | ||
245 | /* Read XCLKCFG register turbo bit */ | |
246 | __asm__ __volatile__("mrc\tp14, 0, %0, c6, c0, 0" : "=r"(xclkcfg)); | |
247 | t = xclkcfg & 0x1; | |
248 | ||
249 | return t ? (parent_rate / xn) * 2 : parent_rate; | |
250 | } | |
251 | PARENTS(clk_pxa3xx_run) = { "cpll" }; | |
252 | RATE_RO_OPS(clk_pxa3xx_run, "run"); | |
253 | ||
254 | static unsigned long clk_pxa3xx_cpll_get_rate(struct clk_hw *hw, | |
255 | unsigned long parent_rate) | |
256 | { | |
257 | unsigned long acsr = ACSR; | |
258 | unsigned int xn = (acsr & ACCR_XN_MASK) >> 8; | |
259 | unsigned int xl = acsr & ACCR_XL_MASK; | |
260 | unsigned int t, xclkcfg; | |
261 | ||
262 | /* Read XCLKCFG register turbo bit */ | |
263 | __asm__ __volatile__("mrc\tp14, 0, %0, c6, c0, 0" : "=r"(xclkcfg)); | |
264 | t = xclkcfg & 0x1; | |
265 | ||
266 | pr_info("RJK: parent_rate=%lu, xl=%u, xn=%u\n", parent_rate, xl, xn); | |
267 | return t ? parent_rate * xl * xn : parent_rate * xl; | |
268 | } | |
269 | PARENTS(clk_pxa3xx_cpll) = { "osc_13mhz" }; | |
270 | RATE_RO_OPS(clk_pxa3xx_cpll, "cpll"); | |
271 | ||
272 | static void __init pxa3xx_register_core(void) | |
273 | { | |
274 | clk_register_clk_pxa3xx_cpll(); | |
275 | clk_register_clk_pxa3xx_run(); | |
276 | ||
277 | clkdev_pxa_register(CLK_CORE, "core", NULL, | |
278 | clk_register_clk_pxa3xx_core()); | |
279 | } | |
280 | ||
281 | static void __init pxa3xx_register_plls(void) | |
282 | { | |
283 | clk_register_fixed_rate(NULL, "osc_13mhz", NULL, | |
2c63935d | 284 | CLK_GET_RATE_NOCACHE, |
9bbb8a33 | 285 | 13 * MHz); |
fc206543 RJ |
286 | clkdev_pxa_register(CLK_OSC32k768, "osc_32_768khz", NULL, |
287 | clk_register_fixed_rate(NULL, "osc_32_768khz", NULL, | |
288 | CLK_GET_RATE_NOCACHE, | |
289 | 32768)); | |
9bbb8a33 | 290 | clk_register_fixed_rate(NULL, "ring_osc_120mhz", NULL, |
2c63935d | 291 | CLK_GET_RATE_NOCACHE, |
9bbb8a33 | 292 | 120 * MHz); |
2c63935d | 293 | clk_register_fixed_rate(NULL, "clk_dummy", NULL, 0, 0); |
9bbb8a33 RJ |
294 | clk_register_fixed_factor(NULL, "spll_624mhz", "osc_13mhz", 0, 48, 1); |
295 | clk_register_fixed_factor(NULL, "ring_osc_60mhz", "ring_osc_120mhz", | |
296 | 0, 1, 2); | |
297 | } | |
298 | ||
299 | #define DUMMY_CLK(_con_id, _dev_id, _parent) \ | |
300 | { .con_id = _con_id, .dev_id = _dev_id, .parent = _parent } | |
301 | struct dummy_clk { | |
302 | const char *con_id; | |
303 | const char *dev_id; | |
304 | const char *parent; | |
305 | }; | |
306 | static struct dummy_clk dummy_clks[] __initdata = { | |
307 | DUMMY_CLK(NULL, "pxa93x-gpio", "osc_13mhz"), | |
308 | DUMMY_CLK(NULL, "sa1100-rtc", "osc_32_768khz"), | |
309 | DUMMY_CLK("UARTCLK", "pxa2xx-ir", "STUART"), | |
310 | DUMMY_CLK(NULL, "pxa3xx-pwri2c.1", "osc_13mhz"), | |
311 | }; | |
312 | ||
313 | static void __init pxa3xx_dummy_clocks_init(void) | |
314 | { | |
315 | struct clk *clk; | |
316 | struct dummy_clk *d; | |
317 | const char *name; | |
318 | int i; | |
319 | ||
320 | for (i = 0; i < ARRAY_SIZE(dummy_clks); i++) { | |
321 | d = &dummy_clks[i]; | |
322 | name = d->dev_id ? d->dev_id : d->con_id; | |
323 | clk = clk_register_fixed_factor(NULL, name, d->parent, 0, 1, 1); | |
324 | clk_register_clkdev(clk, d->con_id, d->dev_id); | |
325 | } | |
326 | } | |
327 | ||
328 | static void __init pxa3xx_base_clocks_init(void) | |
329 | { | |
869de5cf IG |
330 | struct clk *clk; |
331 | ||
9bbb8a33 RJ |
332 | pxa3xx_register_plls(); |
333 | pxa3xx_register_core(); | |
334 | clk_register_clk_pxa3xx_system_bus(); | |
335 | clk_register_clk_pxa3xx_ac97(); | |
336 | clk_register_clk_pxa3xx_smemc(); | |
869de5cf IG |
337 | clk = clk_register_gate(NULL, "CLK_POUT", |
338 | "osc_13mhz", 0, OSCC, 11, 0, NULL); | |
339 | clk_register_clkdev(clk, "CLK_POUT", NULL); | |
c7739aeb RJ |
340 | clkdev_pxa_register(CLK_OSTIMER, "OSTIMER0", NULL, |
341 | clk_register_fixed_factor(NULL, "os-timer0", | |
342 | "osc_13mhz", 0, 1, 4)); | |
9bbb8a33 RJ |
343 | } |
344 | ||
345 | int __init pxa3xx_clocks_init(void) | |
346 | { | |
347 | int ret; | |
348 | ||
349 | pxa3xx_base_clocks_init(); | |
350 | pxa3xx_dummy_clocks_init(); | |
351 | ret = clk_pxa_cken_init(pxa3xx_clocks, ARRAY_SIZE(pxa3xx_clocks)); | |
352 | if (ret) | |
353 | return ret; | |
354 | if (cpu_is_pxa320()) | |
355 | return clk_pxa_cken_init(pxa320_clocks, | |
356 | ARRAY_SIZE(pxa320_clocks)); | |
357 | if (cpu_is_pxa300() || cpu_is_pxa310()) | |
358 | return clk_pxa_cken_init(pxa300_310_clocks, | |
359 | ARRAY_SIZE(pxa300_310_clocks)); | |
360 | return clk_pxa_cken_init(pxa93x_clocks, ARRAY_SIZE(pxa93x_clocks)); | |
361 | } | |
362 | ||
363 | static void __init pxa3xx_dt_clocks_init(struct device_node *np) | |
364 | { | |
365 | pxa3xx_clocks_init(); | |
366 | clk_pxa_dt_common_init(np); | |
367 | } | |
368 | CLK_OF_DECLARE(pxa_clks, "marvell,pxa300-clocks", pxa3xx_dt_clocks_init); |