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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / arch / arm / plat-s3c24xx / s3c2443-clock.c
blob59552c0ea5fb3efe6feaaa17a42b39a8cfd05685
1 /* linux/arch/arm/plat-s3c24xx/s3c2443-clock.c
2 *
3 * Copyright (c) 2007, 2010 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
5 *
6 * S3C2443 Clock control suport - common code
7 */
8
9 #include <linux/init.h>
10 #include <linux/clk.h>
11 #include <linux/io.h>
12
13 #include <mach/regs-s3c2443-clock.h>
14
15 #include <plat/s3c2443.h>
16 #include <plat/clock.h>
17 #include <plat/clock-clksrc.h>
18 #include <plat/cpu.h>
19
20 #include <plat/cpu-freq.h>
21
22
23 static int s3c2443_gate(void __iomem *reg, struct clk *clk, int enable)
24 {
25 u32 ctrlbit = clk->ctrlbit;
26 u32 con = __raw_readl(reg);
27
28 if (enable)
29 con |= ctrlbit;
30 else
31 con &= ~ctrlbit;
32
33 __raw_writel(con, reg);
34 return 0;
35 }
36
37 int s3c2443_clkcon_enable_h(struct clk *clk, int enable)
38 {
39 return s3c2443_gate(S3C2443_HCLKCON, clk, enable);
40 }
41
42 int s3c2443_clkcon_enable_p(struct clk *clk, int enable)
43 {
44 return s3c2443_gate(S3C2443_PCLKCON, clk, enable);
45 }
46
47 int s3c2443_clkcon_enable_s(struct clk *clk, int enable)
48 {
49 return s3c2443_gate(S3C2443_SCLKCON, clk, enable);
50 }
51
52 /* mpllref is a direct descendant of clk_xtal by default, but it is not
53 * elided as the EPLL can be either sourced by the XTAL or EXTCLK and as
54 * such directly equating the two source clocks is impossible.
55 */
56 struct clk clk_mpllref = {
57 .name = "mpllref",
58 .parent = &clk_xtal,
59 };
60
61 static struct clk *clk_epllref_sources[] = {
62 [0] = &clk_mpllref,
63 [1] = &clk_mpllref,
64 [2] = &clk_xtal,
65 [3] = &clk_ext,
66 };
67
68 struct clksrc_clk clk_epllref = {
69 .clk = {
70 .name = "epllref",
71 },
72 .sources = &(struct clksrc_sources) {
73 .sources = clk_epllref_sources,
74 .nr_sources = ARRAY_SIZE(clk_epllref_sources),
75 },
76 .reg_src = { .reg = S3C2443_CLKSRC, .size = 2, .shift = 7 },
77 };
78
79 /* esysclk
80 *
81 * this is sourced from either the EPLL or the EPLLref clock
82 */
83
84 static struct clk *clk_sysclk_sources[] = {
85 [0] = &clk_epllref.clk,
86 [1] = &clk_epll,
87 };
88
89 struct clksrc_clk clk_esysclk = {
90 .clk = {
91 .name = "esysclk",
92 .parent = &clk_epll,
93 },
94 .sources = &(struct clksrc_sources) {
95 .sources = clk_sysclk_sources,
96 .nr_sources = ARRAY_SIZE(clk_sysclk_sources),
97 },
98 .reg_src = { .reg = S3C2443_CLKSRC, .size = 1, .shift = 6 },
99 };
100
101 static unsigned long s3c2443_getrate_mdivclk(struct clk *clk)
102 {
103 unsigned long parent_rate = clk_get_rate(clk->parent);
104 unsigned long div = __raw_readl(S3C2443_CLKDIV0);
105
106 div &= S3C2443_CLKDIV0_EXTDIV_MASK;
107 div >>= (S3C2443_CLKDIV0_EXTDIV_SHIFT-1); /* x2 */
108
109 return parent_rate / (div + 1);
110 }
111
112 static struct clk clk_mdivclk = {
113 .name = "mdivclk",
114 .parent = &clk_mpllref,
115 .ops = &(struct clk_ops) {
116 .get_rate = s3c2443_getrate_mdivclk,
117 },
118 };
119
120 static struct clk *clk_msysclk_sources[] = {
121 [0] = &clk_mpllref,
122 [1] = &clk_mpll,
123 [2] = &clk_mdivclk,
124 [3] = &clk_mpllref,
125 };
126
127 struct clksrc_clk clk_msysclk = {
128 .clk = {
129 .name = "msysclk",
130 .parent = &clk_xtal,
131 },
132 .sources = &(struct clksrc_sources) {
133 .sources = clk_msysclk_sources,
134 .nr_sources = ARRAY_SIZE(clk_msysclk_sources),
135 },
136 .reg_src = { .reg = S3C2443_CLKSRC, .size = 2, .shift = 3 },
137 };
138
139 /* prediv
140 *
141 * this divides the msysclk down to pass to h/p/etc.
142 */
143
144 static unsigned long s3c2443_prediv_getrate(struct clk *clk)
145 {
146 unsigned long rate = clk_get_rate(clk->parent);
147 unsigned long clkdiv0 = __raw_readl(S3C2443_CLKDIV0);
148
149 clkdiv0 &= S3C2443_CLKDIV0_PREDIV_MASK;
150 clkdiv0 >>= S3C2443_CLKDIV0_PREDIV_SHIFT;
151
152 return rate / (clkdiv0 + 1);
153 }
154
155 static struct clk clk_prediv = {
156 .name = "prediv",
157 .parent = &clk_msysclk.clk,
158 .ops = &(struct clk_ops) {
159 .get_rate = s3c2443_prediv_getrate,
160 },
161 };
162
163 /* usbhost
164 *
165 * usb host bus-clock, usually 48MHz to provide USB bus clock timing
166 */
167
168 static struct clksrc_clk clk_usb_bus_host = {
169 .clk = {
170 .name = "usb-bus-host-parent",
171 .parent = &clk_esysclk.clk,
172 .ctrlbit = S3C2443_SCLKCON_USBHOST,
173 .enable = s3c2443_clkcon_enable_s,
174 },
175 .reg_div = { .reg = S3C2443_CLKDIV1, .size = 2, .shift = 4 },
176 };
177
178 /* common clksrc clocks */
179
180 static struct clksrc_clk clksrc_clks[] = {
181 {
182 /* ART baud-rate clock sourced from esysclk via a divisor */
183 .clk = {
184 .name = "uartclk",
185 .parent = &clk_esysclk.clk,
186 },
187 .reg_div = { .reg = S3C2443_CLKDIV1, .size = 4, .shift = 8 },
188 }, {
189 /* camera interface bus-clock, divided down from esysclk */
190 .clk = {
191 .name = "camif-upll", /* same as 2440 name */
192 .parent = &clk_esysclk.clk,
193 .ctrlbit = S3C2443_SCLKCON_CAMCLK,
194 .enable = s3c2443_clkcon_enable_s,
195 },
196 .reg_div = { .reg = S3C2443_CLKDIV1, .size = 4, .shift = 26 },
197 }, {
198 .clk = {
199 .name = "display-if",
200 .parent = &clk_esysclk.clk,
201 .ctrlbit = S3C2443_SCLKCON_DISPCLK,
202 .enable = s3c2443_clkcon_enable_s,
203 },
204 .reg_div = { .reg = S3C2443_CLKDIV1, .size = 8, .shift = 16 },
205 },
206 };
207
208
209 static struct clk init_clocks_off[] = {
210 {
211 .name = "adc",
212 .parent = &clk_p,
213 .enable = s3c2443_clkcon_enable_p,
214 .ctrlbit = S3C2443_PCLKCON_ADC,
215 }, {
216 .name = "i2c",
217 .parent = &clk_p,
218 .enable = s3c2443_clkcon_enable_p,
219 .ctrlbit = S3C2443_PCLKCON_IIC,
220 }
221 };
222
223 static struct clk init_clocks[] = {
224 {
225 .name = "dma",
226 .parent = &clk_h,
227 .enable = s3c2443_clkcon_enable_h,
228 .ctrlbit = S3C2443_HCLKCON_DMA0,
229 }, {
230 .name = "dma",
231 .parent = &clk_h,
232 .enable = s3c2443_clkcon_enable_h,
233 .ctrlbit = S3C2443_HCLKCON_DMA1,
234 }, {
235 .name = "dma",
236 .parent = &clk_h,
237 .enable = s3c2443_clkcon_enable_h,
238 .ctrlbit = S3C2443_HCLKCON_DMA2,
239 }, {
240 .name = "dma",
241 .parent = &clk_h,
242 .enable = s3c2443_clkcon_enable_h,
243 .ctrlbit = S3C2443_HCLKCON_DMA3,
244 }, {
245 .name = "dma",
246 .parent = &clk_h,
247 .enable = s3c2443_clkcon_enable_h,
248 .ctrlbit = S3C2443_HCLKCON_DMA4,
249 }, {
250 .name = "dma",
251 .parent = &clk_h,
252 .enable = s3c2443_clkcon_enable_h,
253 .ctrlbit = S3C2443_HCLKCON_DMA5,
254 }, {
255 .name = "hsmmc",
256 .parent = &clk_h,
257 .enable = s3c2443_clkcon_enable_h,
258 .ctrlbit = S3C2443_HCLKCON_HSMMC,
259 }, {
260 .name = "gpio",
261 .parent = &clk_p,
262 .enable = s3c2443_clkcon_enable_p,
263 .ctrlbit = S3C2443_PCLKCON_GPIO,
264 }, {
265 .name = "usb-host",
266 .parent = &clk_h,
267 .enable = s3c2443_clkcon_enable_h,
268 .ctrlbit = S3C2443_HCLKCON_USBH,
269 }, {
270 .name = "usb-device",
271 .parent = &clk_h,
272 .enable = s3c2443_clkcon_enable_h,
273 .ctrlbit = S3C2443_HCLKCON_USBD,
274 }, {
275 .name = "lcd",
276 .parent = &clk_h,
277 .enable = s3c2443_clkcon_enable_h,
278 .ctrlbit = S3C2443_HCLKCON_LCDC,
279
280 }, {
281 .name = "timers",
282 .parent = &clk_p,
283 .enable = s3c2443_clkcon_enable_p,
284 .ctrlbit = S3C2443_PCLKCON_PWMT,
285 }, {
286 .name = "cfc",
287 .parent = &clk_h,
288 .enable = s3c2443_clkcon_enable_h,
289 .ctrlbit = S3C2443_HCLKCON_CFC,
290 }, {
291 .name = "ssmc",
292 .parent = &clk_h,
293 .enable = s3c2443_clkcon_enable_h,
294 .ctrlbit = S3C2443_HCLKCON_SSMC,
295 }, {
296 .name = "uart",
297 .devname = "s3c2440-uart.0",
298 .parent = &clk_p,
299 .enable = s3c2443_clkcon_enable_p,
300 .ctrlbit = S3C2443_PCLKCON_UART0,
301 }, {
302 .name = "uart",
303 .devname = "s3c2440-uart.1",
304 .parent = &clk_p,
305 .enable = s3c2443_clkcon_enable_p,
306 .ctrlbit = S3C2443_PCLKCON_UART1,
307 }, {
308 .name = "uart",
309 .devname = "s3c2440-uart.2",
310 .parent = &clk_p,
311 .enable = s3c2443_clkcon_enable_p,
312 .ctrlbit = S3C2443_PCLKCON_UART2,
313 }, {
314 .name = "uart",
315 .devname = "s3c2440-uart.3",
316 .parent = &clk_p,
317 .enable = s3c2443_clkcon_enable_p,
318 .ctrlbit = S3C2443_PCLKCON_UART3,
319 }, {
320 .name = "rtc",
321 .parent = &clk_p,
322 .enable = s3c2443_clkcon_enable_p,
323 .ctrlbit = S3C2443_PCLKCON_RTC,
324 }, {
325 .name = "watchdog",
326 .parent = &clk_p,
327 .ctrlbit = S3C2443_PCLKCON_WDT,
328 }, {
329 .name = "ac97",
330 .parent = &clk_p,
331 .ctrlbit = S3C2443_PCLKCON_AC97,
332 }, {
333 .name = "nand",
334 .parent = &clk_h,
335 }, {
336 .name = "usb-bus-host",
337 .parent = &clk_usb_bus_host.clk,
338 }
339 };
340
341 static inline unsigned long s3c2443_get_hdiv(unsigned long clkcon0)
342 {
343 clkcon0 &= S3C2443_CLKDIV0_HCLKDIV_MASK;
344
345 return clkcon0 + 1;
346 }
347
348 /* EPLLCON compatible enough to get on/off information */
349
350 void __init_or_cpufreq s3c2443_common_setup_clocks(pll_fn get_mpll,
351 fdiv_fn get_fdiv)
352 {
353 unsigned long epllcon = __raw_readl(S3C2443_EPLLCON);
354 unsigned long mpllcon = __raw_readl(S3C2443_MPLLCON);
355 unsigned long clkdiv0 = __raw_readl(S3C2443_CLKDIV0);
356 struct clk *xtal_clk;
357 unsigned long xtal;
358 unsigned long pll;
359 unsigned long fclk;
360 unsigned long hclk;
361 unsigned long pclk;
362 int ptr;
363
364 xtal_clk = clk_get(NULL, "xtal");
365 xtal = clk_get_rate(xtal_clk);
366 clk_put(xtal_clk);
367
368 pll = get_mpll(mpllcon, xtal);
369 clk_msysclk.clk.rate = pll;
370
371 fclk = pll / get_fdiv(clkdiv0);
372 hclk = s3c2443_prediv_getrate(&clk_prediv);
373 hclk /= s3c2443_get_hdiv(clkdiv0);
374 pclk = hclk / ((clkdiv0 & S3C2443_CLKDIV0_HALF_PCLK) ? 2 : 1);
375
376 s3c24xx_setup_clocks(fclk, hclk, pclk);
377
378 printk("CPU: MPLL %s %ld.%03ld MHz, cpu %ld.%03ld MHz, mem %ld.%03ld MHz, pclk %ld.%03ld MHz\n",
379 (mpllcon & S3C2443_PLLCON_OFF) ? "off":"on",
380 print_mhz(pll), print_mhz(fclk),
381 print_mhz(hclk), print_mhz(pclk));
382
383 for (ptr = 0; ptr < ARRAY_SIZE(clksrc_clks); ptr++)
384 s3c_set_clksrc(&clksrc_clks[ptr], true);
385
386 /* ensure usb bus clock is within correct rate of 48MHz */
387
388 if (clk_get_rate(&clk_usb_bus_host.clk) != (48 * 1000 * 1000)) {
389 printk(KERN_INFO "Warning: USB host bus not at 48MHz\n");
390 clk_set_rate(&clk_usb_bus_host.clk, 48*1000*1000);
391 }
392
393 printk("CPU: EPLL %s %ld.%03ld MHz, usb-bus %ld.%03ld MHz\n",
394 (epllcon & S3C2443_PLLCON_OFF) ? "off":"on",
395 print_mhz(clk_get_rate(&clk_epll)),
396 print_mhz(clk_get_rate(&clk_usb_bus)));
397 }
398
399 static struct clk *clks[] __initdata = {
400 &clk_prediv,
401 &clk_mpllref,
402 &clk_mdivclk,
403 &clk_ext,
404 &clk_epll,
405 &clk_usb_bus,
406 };
407
408 static struct clksrc_clk *clksrcs[] __initdata = {
409 &clk_usb_bus_host,
410 &clk_epllref,
411 &clk_esysclk,
412 &clk_msysclk,
413 };
414
415 void __init s3c2443_common_init_clocks(int xtal, pll_fn get_mpll,
416 fdiv_fn get_fdiv)
417 {
418 int ptr;
419
420 /* s3c2443 parents h and p clocks from prediv */
421 clk_h.parent = &clk_prediv;
422 clk_p.parent = &clk_prediv;
423
424 clk_usb_bus.parent = &clk_usb_bus_host.clk;
425 clk_epll.parent = &clk_epllref.clk;
426
427 s3c24xx_register_baseclocks(xtal);
428 s3c24xx_register_clocks(clks, ARRAY_SIZE(clks));
429
430 for (ptr = 0; ptr < ARRAY_SIZE(clksrcs); ptr++)
431 s3c_register_clksrc(clksrcs[ptr], 1);
432
433 s3c_register_clksrc(clksrc_clks, ARRAY_SIZE(clksrc_clks));
434 s3c_register_clocks(init_clocks, ARRAY_SIZE(init_clocks));
435
436 /* See s3c2443/etc notes on disabling clocks at init time */
437 s3c_register_clocks(init_clocks_off, ARRAY_SIZE(init_clocks_off));
438 s3c_disable_clocks(init_clocks_off, ARRAY_SIZE(init_clocks_off));
439
440 s3c2443_common_setup_clocks(get_mpll, get_fdiv);
441 }
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