1 /* linux/arch/arm/plat-s3c24xx/s3c2443-clock.c
3 * Copyright (c) 2007, 2010 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
6 * S3C2443 Clock control suport - common code
9 #include <linux/init.h>
10 #include <linux/clk.h>
13 #include <mach/regs-s3c2443-clock.h>
15 #include <plat/s3c2443.h>
16 #include <plat/clock.h>
17 #include <plat/clock-clksrc.h>
20 #include <plat/cpu-freq.h>
23 static int s3c2443_gate(void __iomem *reg, struct clk *clk, int enable)
25 u32 ctrlbit = clk->ctrlbit;
26 u32 con = __raw_readl(reg);
33 __raw_writel(con, reg);
37 int s3c2443_clkcon_enable_h(struct clk *clk, int enable)
39 return s3c2443_gate(S3C2443_HCLKCON, clk, enable);
42 int s3c2443_clkcon_enable_p(struct clk *clk, int enable)
44 return s3c2443_gate(S3C2443_PCLKCON, clk, enable);
47 int s3c2443_clkcon_enable_s(struct clk *clk, int enable)
49 return s3c2443_gate(S3C2443_SCLKCON, clk, enable);
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.
56 struct clk clk_mpllref = {
61 static struct clk *clk_epllref_sources[] = {
68 struct clksrc_clk clk_epllref = {
72 .sources = &(struct clksrc_sources) {
73 .sources = clk_epllref_sources,
74 .nr_sources = ARRAY_SIZE(clk_epllref_sources),
76 .reg_src = { .reg = S3C2443_CLKSRC, .size = 2, .shift = 7 },
81 * this is sourced from either the EPLL or the EPLLref clock
84 static struct clk *clk_sysclk_sources[] = {
85 [0] = &clk_epllref.clk,
89 struct clksrc_clk clk_esysclk = {
94 .sources = &(struct clksrc_sources) {
95 .sources = clk_sysclk_sources,
96 .nr_sources = ARRAY_SIZE(clk_sysclk_sources),
98 .reg_src = { .reg = S3C2443_CLKSRC, .size = 1, .shift = 6 },
101 static unsigned long s3c2443_getrate_mdivclk(struct clk *clk)
103 unsigned long parent_rate = clk_get_rate(clk->parent);
104 unsigned long div = __raw_readl(S3C2443_CLKDIV0);
106 div &= S3C2443_CLKDIV0_EXTDIV_MASK;
107 div >>= (S3C2443_CLKDIV0_EXTDIV_SHIFT-1); /* x2 */
109 return parent_rate / (div + 1);
112 static struct clk clk_mdivclk = {
114 .parent = &clk_mpllref,
115 .ops = &(struct clk_ops) {
116 .get_rate = s3c2443_getrate_mdivclk,
120 static struct clk *clk_msysclk_sources[] = {
127 struct clksrc_clk clk_msysclk = {
132 .sources = &(struct clksrc_sources) {
133 .sources = clk_msysclk_sources,
134 .nr_sources = ARRAY_SIZE(clk_msysclk_sources),
136 .reg_src = { .reg = S3C2443_CLKSRC, .size = 2, .shift = 3 },
141 * this divides the msysclk down to pass to h/p/etc.
144 static unsigned long s3c2443_prediv_getrate(struct clk *clk)
146 unsigned long rate = clk_get_rate(clk->parent);
147 unsigned long clkdiv0 = __raw_readl(S3C2443_CLKDIV0);
149 clkdiv0 &= S3C2443_CLKDIV0_PREDIV_MASK;
150 clkdiv0 >>= S3C2443_CLKDIV0_PREDIV_SHIFT;
152 return rate / (clkdiv0 + 1);
155 static struct clk clk_prediv = {
157 .parent = &clk_msysclk.clk,
158 .ops = &(struct clk_ops) {
159 .get_rate = s3c2443_prediv_getrate,
165 * usb host bus-clock, usually 48MHz to provide USB bus clock timing
168 static struct clksrc_clk clk_usb_bus_host = {
170 .name = "usb-bus-host-parent",
171 .parent = &clk_esysclk.clk,
172 .ctrlbit = S3C2443_SCLKCON_USBHOST,
173 .enable = s3c2443_clkcon_enable_s,
175 .reg_div = { .reg = S3C2443_CLKDIV1, .size = 2, .shift = 4 },
178 /* common clksrc clocks */
180 static struct clksrc_clk clksrc_clks[] = {
182 /* ART baud-rate clock sourced from esysclk via a divisor */
185 .parent = &clk_esysclk.clk,
187 .reg_div = { .reg = S3C2443_CLKDIV1, .size = 4, .shift = 8 },
189 /* camera interface bus-clock, divided down from esysclk */
191 .name = "camif-upll", /* same as 2440 name */
192 .parent = &clk_esysclk.clk,
193 .ctrlbit = S3C2443_SCLKCON_CAMCLK,
194 .enable = s3c2443_clkcon_enable_s,
196 .reg_div = { .reg = S3C2443_CLKDIV1, .size = 4, .shift = 26 },
199 .name = "display-if",
200 .parent = &clk_esysclk.clk,
201 .ctrlbit = S3C2443_SCLKCON_DISPCLK,
202 .enable = s3c2443_clkcon_enable_s,
204 .reg_div = { .reg = S3C2443_CLKDIV1, .size = 8, .shift = 16 },
208 static struct clk clk_i2s_ext = {
214 * This clock is the output from the I2S divisor of ESYSCLK, and is separate
215 * from the mux that comes after it (cannot merge into one single clock)
218 static struct clksrc_clk clk_i2s_eplldiv = {
220 .name = "i2s-eplldiv",
221 .parent = &clk_esysclk.clk,
223 .reg_div = { .reg = S3C2443_CLKDIV1, .size = 4, .shift = 12, },
228 * i2s bus reference clock, selectable from external, esysclk or epllref
230 * Note, this used to be two clocks, but was compressed into one.
233 static struct clk *clk_i2s_srclist[] = {
234 [0] = &clk_i2s_eplldiv.clk,
236 [2] = &clk_epllref.clk,
237 [3] = &clk_epllref.clk,
240 static struct clksrc_clk clk_i2s = {
243 .ctrlbit = S3C2443_SCLKCON_I2SCLK,
244 .enable = s3c2443_clkcon_enable_s,
247 .sources = &(struct clksrc_sources) {
248 .sources = clk_i2s_srclist,
249 .nr_sources = ARRAY_SIZE(clk_i2s_srclist),
251 .reg_src = { .reg = S3C2443_CLKSRC, .size = 2, .shift = 14 },
254 static struct clk init_clocks_off[] = {
258 .enable = s3c2443_clkcon_enable_p,
259 .ctrlbit = S3C2443_PCLKCON_IIS,
263 .enable = s3c2443_clkcon_enable_p,
264 .ctrlbit = S3C2443_PCLKCON_HSSPI,
268 .enable = s3c2443_clkcon_enable_p,
269 .ctrlbit = S3C2443_PCLKCON_ADC,
273 .enable = s3c2443_clkcon_enable_p,
274 .ctrlbit = S3C2443_PCLKCON_IIC,
278 static struct clk init_clocks[] = {
282 .enable = s3c2443_clkcon_enable_h,
283 .ctrlbit = S3C2443_HCLKCON_DMA0,
287 .enable = s3c2443_clkcon_enable_h,
288 .ctrlbit = S3C2443_HCLKCON_DMA1,
292 .enable = s3c2443_clkcon_enable_h,
293 .ctrlbit = S3C2443_HCLKCON_DMA2,
297 .enable = s3c2443_clkcon_enable_h,
298 .ctrlbit = S3C2443_HCLKCON_DMA3,
302 .enable = s3c2443_clkcon_enable_h,
303 .ctrlbit = S3C2443_HCLKCON_DMA4,
307 .enable = s3c2443_clkcon_enable_h,
308 .ctrlbit = S3C2443_HCLKCON_DMA5,
312 .enable = s3c2443_clkcon_enable_h,
313 .ctrlbit = S3C2443_HCLKCON_HSMMC,
317 .enable = s3c2443_clkcon_enable_p,
318 .ctrlbit = S3C2443_PCLKCON_GPIO,
322 .enable = s3c2443_clkcon_enable_h,
323 .ctrlbit = S3C2443_HCLKCON_USBH,
325 .name = "usb-device",
327 .enable = s3c2443_clkcon_enable_h,
328 .ctrlbit = S3C2443_HCLKCON_USBD,
332 .enable = s3c2443_clkcon_enable_h,
333 .ctrlbit = S3C2443_HCLKCON_LCDC,
338 .enable = s3c2443_clkcon_enable_p,
339 .ctrlbit = S3C2443_PCLKCON_PWMT,
343 .enable = s3c2443_clkcon_enable_h,
344 .ctrlbit = S3C2443_HCLKCON_CFC,
348 .enable = s3c2443_clkcon_enable_h,
349 .ctrlbit = S3C2443_HCLKCON_SSMC,
352 .devname = "s3c2440-uart.0",
354 .enable = s3c2443_clkcon_enable_p,
355 .ctrlbit = S3C2443_PCLKCON_UART0,
358 .devname = "s3c2440-uart.1",
360 .enable = s3c2443_clkcon_enable_p,
361 .ctrlbit = S3C2443_PCLKCON_UART1,
364 .devname = "s3c2440-uart.2",
366 .enable = s3c2443_clkcon_enable_p,
367 .ctrlbit = S3C2443_PCLKCON_UART2,
370 .devname = "s3c2440-uart.3",
372 .enable = s3c2443_clkcon_enable_p,
373 .ctrlbit = S3C2443_PCLKCON_UART3,
377 .enable = s3c2443_clkcon_enable_p,
378 .ctrlbit = S3C2443_PCLKCON_RTC,
382 .ctrlbit = S3C2443_PCLKCON_WDT,
386 .ctrlbit = S3C2443_PCLKCON_AC97,
391 .name = "usb-bus-host",
392 .parent = &clk_usb_bus_host.clk,
396 static inline unsigned long s3c2443_get_hdiv(unsigned long clkcon0)
398 clkcon0 &= S3C2443_CLKDIV0_HCLKDIV_MASK;
403 /* EPLLCON compatible enough to get on/off information */
405 void __init_or_cpufreq s3c2443_common_setup_clocks(pll_fn get_mpll,
408 unsigned long epllcon = __raw_readl(S3C2443_EPLLCON);
409 unsigned long mpllcon = __raw_readl(S3C2443_MPLLCON);
410 unsigned long clkdiv0 = __raw_readl(S3C2443_CLKDIV0);
411 struct clk *xtal_clk;
419 xtal_clk = clk_get(NULL, "xtal");
420 xtal = clk_get_rate(xtal_clk);
423 pll = get_mpll(mpllcon, xtal);
424 clk_msysclk.clk.rate = pll;
426 fclk = pll / get_fdiv(clkdiv0);
427 hclk = s3c2443_prediv_getrate(&clk_prediv);
428 hclk /= s3c2443_get_hdiv(clkdiv0);
429 pclk = hclk / ((clkdiv0 & S3C2443_CLKDIV0_HALF_PCLK) ? 2 : 1);
431 s3c24xx_setup_clocks(fclk, hclk, pclk);
433 printk("CPU: MPLL %s %ld.%03ld MHz, cpu %ld.%03ld MHz, mem %ld.%03ld MHz, pclk %ld.%03ld MHz\n",
434 (mpllcon & S3C2443_PLLCON_OFF) ? "off":"on",
435 print_mhz(pll), print_mhz(fclk),
436 print_mhz(hclk), print_mhz(pclk));
438 for (ptr = 0; ptr < ARRAY_SIZE(clksrc_clks); ptr++)
439 s3c_set_clksrc(&clksrc_clks[ptr], true);
441 /* ensure usb bus clock is within correct rate of 48MHz */
443 if (clk_get_rate(&clk_usb_bus_host.clk) != (48 * 1000 * 1000)) {
444 printk(KERN_INFO "Warning: USB host bus not at 48MHz\n");
445 clk_set_rate(&clk_usb_bus_host.clk, 48*1000*1000);
448 printk("CPU: EPLL %s %ld.%03ld MHz, usb-bus %ld.%03ld MHz\n",
449 (epllcon & S3C2443_PLLCON_OFF) ? "off":"on",
450 print_mhz(clk_get_rate(&clk_epll)),
451 print_mhz(clk_get_rate(&clk_usb_bus)));
454 static struct clk *clks[] __initdata = {
463 static struct clksrc_clk *clksrcs[] __initdata = {
472 void __init s3c2443_common_init_clocks(int xtal, pll_fn get_mpll,
477 /* s3c2443 parents h and p clocks from prediv */
478 clk_h.parent = &clk_prediv;
479 clk_p.parent = &clk_prediv;
481 clk_usb_bus.parent = &clk_usb_bus_host.clk;
482 clk_epll.parent = &clk_epllref.clk;
484 s3c24xx_register_baseclocks(xtal);
485 s3c24xx_register_clocks(clks, ARRAY_SIZE(clks));
487 for (ptr = 0; ptr < ARRAY_SIZE(clksrcs); ptr++)
488 s3c_register_clksrc(clksrcs[ptr], 1);
490 s3c_register_clksrc(clksrc_clks, ARRAY_SIZE(clksrc_clks));
491 s3c_register_clocks(init_clocks, ARRAY_SIZE(init_clocks));
493 /* See s3c2443/etc notes on disabling clocks at init time */
494 s3c_register_clocks(init_clocks_off, ARRAY_SIZE(init_clocks_off));
495 s3c_disable_clocks(init_clocks_off, ARRAY_SIZE(init_clocks_off));
497 s3c2443_common_setup_clocks(get_mpll, get_fdiv);