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OMAP3 SRF: Voltage scaling support
[linux-ginger.git] / arch / arm / mach-omap2 / clock24xx.c
blobe70e7e000eaae00b5ad6942c58edc16e11024c34
1 /*
2 * linux/arch/arm/mach-omap2/clock.c
3 *
4 * Copyright (C) 2005-2008 Texas Instruments, Inc.
5 * Copyright (C) 2004-2008 Nokia Corporation
6 *
7 * Contacts:
8 * Richard Woodruff <r-woodruff2@ti.com>
9 * Paul Walmsley
10 *
11 * Based on earlier work by Tuukka Tikkanen, Tony Lindgren,
12 * Gordon McNutt and RidgeRun, Inc.
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2 as
16 * published by the Free Software Foundation.
17 */
18 #undef DEBUG
19
20 #include <linux/module.h>
21 #include <linux/kernel.h>
22 #include <linux/device.h>
23 #include <linux/list.h>
24 #include <linux/errno.h>
25 #include <linux/delay.h>
26 #include <linux/clk.h>
27 #include <linux/io.h>
28 #include <linux/cpufreq.h>
29 #include <linux/bitops.h>
30
31 #include <plat/clock.h>
32 #include <plat/sram.h>
33 #include <plat/prcm.h>
34 #include <asm/div64.h>
35 #include <asm/clkdev.h>
36
37 #include <plat/sdrc.h>
38 #include "clock.h"
39 #include "prm.h"
40 #include "prm-regbits-24xx.h"
41 #include "cm.h"
42 #include "cm-regbits-24xx.h"
43
44 static const struct clkops clkops_oscck;
45 static const struct clkops clkops_fixed;
46
47 static void omap2430_clk_i2chs_find_idlest(struct clk *clk,
48 void __iomem **idlest_reg,
49 u8 *idlest_bit);
50
51 /* 2430 I2CHS has non-standard IDLEST register */
52 static const struct clkops clkops_omap2430_i2chs_wait = {
53 .enable = omap2_dflt_clk_enable,
54 .disable = omap2_dflt_clk_disable,
55 .find_idlest = omap2430_clk_i2chs_find_idlest,
56 .find_companion = omap2_clk_dflt_find_companion,
57 };
58
59 #include "clock24xx.h"
60
61 struct omap_clk {
62 u32 cpu;
63 struct clk_lookup lk;
64 };
65
66 #define CLK(dev, con, ck, cp) \
67 { \
68 .cpu = cp, \
69 .lk = { \
70 .dev_id = dev, \
71 .con_id = con, \
72 .clk = ck, \
73 }, \
74 }
75
76 #define CK_243X RATE_IN_243X
77 #define CK_242X RATE_IN_242X
78
79 static struct omap_clk omap24xx_clks[] = {
80 /* external root sources */
81 CLK(NULL, "func_32k_ck", &func_32k_ck, CK_243X | CK_242X),
82 CLK(NULL, "secure_32k_ck", &secure_32k_ck, CK_243X | CK_242X),
83 CLK(NULL, "osc_ck", &osc_ck, CK_243X | CK_242X),
84 CLK(NULL, "sys_ck", &sys_ck, CK_243X | CK_242X),
85 CLK(NULL, "alt_ck", &alt_ck, CK_243X | CK_242X),
86 /* internal analog sources */
87 CLK(NULL, "dpll_ck", &dpll_ck, CK_243X | CK_242X),
88 CLK(NULL, "apll96_ck", &apll96_ck, CK_243X | CK_242X),
89 CLK(NULL, "apll54_ck", &apll54_ck, CK_243X | CK_242X),
90 /* internal prcm root sources */
91 CLK(NULL, "func_54m_ck", &func_54m_ck, CK_243X | CK_242X),
92 CLK(NULL, "core_ck", &core_ck, CK_243X | CK_242X),
93 CLK(NULL, "func_96m_ck", &func_96m_ck, CK_243X | CK_242X),
94 CLK(NULL, "func_48m_ck", &func_48m_ck, CK_243X | CK_242X),
95 CLK(NULL, "func_12m_ck", &func_12m_ck, CK_243X | CK_242X),
96 CLK(NULL, "ck_wdt1_osc", &wdt1_osc_ck, CK_243X | CK_242X),
97 CLK(NULL, "sys_clkout_src", &sys_clkout_src, CK_243X | CK_242X),
98 CLK(NULL, "sys_clkout", &sys_clkout, CK_243X | CK_242X),
99 CLK(NULL, "sys_clkout2_src", &sys_clkout2_src, CK_242X),
100 CLK(NULL, "sys_clkout2", &sys_clkout2, CK_242X),
101 CLK(NULL, "emul_ck", &emul_ck, CK_242X),
102 /* mpu domain clocks */
103 CLK(NULL, "mpu_ck", &mpu_ck, CK_243X | CK_242X),
104 /* dsp domain clocks */
105 CLK(NULL, "dsp_fck", &dsp_fck, CK_243X | CK_242X),
106 CLK(NULL, "dsp_irate_ick", &dsp_irate_ick, CK_243X | CK_242X),
107 CLK(NULL, "dsp_ick", &dsp_ick, CK_242X),
108 CLK(NULL, "iva2_1_ick", &iva2_1_ick, CK_243X),
109 CLK(NULL, "iva1_ifck", &iva1_ifck, CK_242X),
110 CLK(NULL, "iva1_mpu_int_ifck", &iva1_mpu_int_ifck, CK_242X),
111 /* GFX domain clocks */
112 CLK(NULL, "gfx_3d_fck", &gfx_3d_fck, CK_243X | CK_242X),
113 CLK(NULL, "gfx_2d_fck", &gfx_2d_fck, CK_243X | CK_242X),
114 CLK(NULL, "gfx_ick", &gfx_ick, CK_243X | CK_242X),
115 /* Modem domain clocks */
116 CLK(NULL, "mdm_ick", &mdm_ick, CK_243X),
117 CLK(NULL, "mdm_osc_ck", &mdm_osc_ck, CK_243X),
118 /* DSS domain clocks */
119 CLK("omapfb", "ick", &dss_ick, CK_243X | CK_242X),
120 CLK("omapfb", "dss1_fck", &dss1_fck, CK_243X | CK_242X),
121 CLK("omapfb", "dss2_fck", &dss2_fck, CK_243X | CK_242X),
122 CLK("omapfb", "tv_fck", &dss_54m_fck, CK_243X | CK_242X),
123 /* L3 domain clocks */
124 CLK(NULL, "core_l3_ck", &core_l3_ck, CK_243X | CK_242X),
125 CLK(NULL, "ssi_fck", &ssi_ssr_sst_fck, CK_243X | CK_242X),
126 CLK(NULL, "usb_l4_ick", &usb_l4_ick, CK_243X | CK_242X),
127 /* L4 domain clocks */
128 CLK(NULL, "l4_ck", &l4_ck, CK_243X | CK_242X),
129 CLK(NULL, "ssi_l4_ick", &ssi_l4_ick, CK_243X | CK_242X),
130 /* virtual meta-group clock */
131 CLK(NULL, "virt_prcm_set", &virt_prcm_set, CK_243X | CK_242X),
132 /* general l4 interface ck, multi-parent functional clk */
133 CLK(NULL, "gpt1_ick", &gpt1_ick, CK_243X | CK_242X),
134 CLK(NULL, "gpt1_fck", &gpt1_fck, CK_243X | CK_242X),
135 CLK(NULL, "gpt2_ick", &gpt2_ick, CK_243X | CK_242X),
136 CLK(NULL, "gpt2_fck", &gpt2_fck, CK_243X | CK_242X),
137 CLK(NULL, "gpt3_ick", &gpt3_ick, CK_243X | CK_242X),
138 CLK(NULL, "gpt3_fck", &gpt3_fck, CK_243X | CK_242X),
139 CLK(NULL, "gpt4_ick", &gpt4_ick, CK_243X | CK_242X),
140 CLK(NULL, "gpt4_fck", &gpt4_fck, CK_243X | CK_242X),
141 CLK(NULL, "gpt5_ick", &gpt5_ick, CK_243X | CK_242X),
142 CLK(NULL, "gpt5_fck", &gpt5_fck, CK_243X | CK_242X),
143 CLK(NULL, "gpt6_ick", &gpt6_ick, CK_243X | CK_242X),
144 CLK(NULL, "gpt6_fck", &gpt6_fck, CK_243X | CK_242X),
145 CLK(NULL, "gpt7_ick", &gpt7_ick, CK_243X | CK_242X),
146 CLK(NULL, "gpt7_fck", &gpt7_fck, CK_243X | CK_242X),
147 CLK(NULL, "gpt8_ick", &gpt8_ick, CK_243X | CK_242X),
148 CLK(NULL, "gpt8_fck", &gpt8_fck, CK_243X | CK_242X),
149 CLK(NULL, "gpt9_ick", &gpt9_ick, CK_243X | CK_242X),
150 CLK(NULL, "gpt9_fck", &gpt9_fck, CK_243X | CK_242X),
151 CLK(NULL, "gpt10_ick", &gpt10_ick, CK_243X | CK_242X),
152 CLK(NULL, "gpt10_fck", &gpt10_fck, CK_243X | CK_242X),
153 CLK(NULL, "gpt11_ick", &gpt11_ick, CK_243X | CK_242X),
154 CLK(NULL, "gpt11_fck", &gpt11_fck, CK_243X | CK_242X),
155 CLK(NULL, "gpt12_ick", &gpt12_ick, CK_243X | CK_242X),
156 CLK(NULL, "gpt12_fck", &gpt12_fck, CK_243X | CK_242X),
157 CLK("omap-mcbsp.1", "ick", &mcbsp1_ick, CK_243X | CK_242X),
158 CLK("omap-mcbsp.1", "fck", &mcbsp1_fck, CK_243X | CK_242X),
159 CLK("omap-mcbsp.2", "ick", &mcbsp2_ick, CK_243X | CK_242X),
160 CLK("omap-mcbsp.2", "fck", &mcbsp2_fck, CK_243X | CK_242X),
161 CLK("omap-mcbsp.3", "ick", &mcbsp3_ick, CK_243X),
162 CLK("omap-mcbsp.3", "fck", &mcbsp3_fck, CK_243X),
163 CLK("omap-mcbsp.4", "ick", &mcbsp4_ick, CK_243X),
164 CLK("omap-mcbsp.4", "fck", &mcbsp4_fck, CK_243X),
165 CLK("omap-mcbsp.5", "ick", &mcbsp5_ick, CK_243X),
166 CLK("omap-mcbsp.5", "fck", &mcbsp5_fck, CK_243X),
167 CLK("omap2_mcspi.1", "ick", &mcspi1_ick, CK_243X | CK_242X),
168 CLK("omap2_mcspi.1", "fck", &mcspi1_fck, CK_243X | CK_242X),
169 CLK("omap2_mcspi.2", "ick", &mcspi2_ick, CK_243X | CK_242X),
170 CLK("omap2_mcspi.2", "fck", &mcspi2_fck, CK_243X | CK_242X),
171 CLK("omap2_mcspi.3", "ick", &mcspi3_ick, CK_243X),
172 CLK("omap2_mcspi.3", "fck", &mcspi3_fck, CK_243X),
173 CLK(NULL, "uart1_ick", &uart1_ick, CK_243X | CK_242X),
174 CLK(NULL, "uart1_fck", &uart1_fck, CK_243X | CK_242X),
175 CLK(NULL, "uart2_ick", &uart2_ick, CK_243X | CK_242X),
176 CLK(NULL, "uart2_fck", &uart2_fck, CK_243X | CK_242X),
177 CLK(NULL, "uart3_ick", &uart3_ick, CK_243X | CK_242X),
178 CLK(NULL, "uart3_fck", &uart3_fck, CK_243X | CK_242X),
179 CLK(NULL, "gpios_ick", &gpios_ick, CK_243X | CK_242X),
180 CLK(NULL, "gpios_fck", &gpios_fck, CK_243X | CK_242X),
181 CLK("omap_wdt", "ick", &mpu_wdt_ick, CK_243X | CK_242X),
182 CLK("omap_wdt", "fck", &mpu_wdt_fck, CK_243X | CK_242X),
183 CLK(NULL, "sync_32k_ick", &sync_32k_ick, CK_243X | CK_242X),
184 CLK(NULL, "wdt1_ick", &wdt1_ick, CK_243X | CK_242X),
185 CLK(NULL, "omapctrl_ick", &omapctrl_ick, CK_243X | CK_242X),
186 CLK(NULL, "icr_ick", &icr_ick, CK_243X),
187 CLK("omap24xxcam", "fck", &cam_fck, CK_243X | CK_242X),
188 CLK("omap24xxcam", "ick", &cam_ick, CK_243X | CK_242X),
189 CLK(NULL, "mailboxes_ick", &mailboxes_ick, CK_243X | CK_242X),
190 CLK(NULL, "wdt4_ick", &wdt4_ick, CK_243X | CK_242X),
191 CLK(NULL, "wdt4_fck", &wdt4_fck, CK_243X | CK_242X),
192 CLK(NULL, "wdt3_ick", &wdt3_ick, CK_242X),
193 CLK(NULL, "wdt3_fck", &wdt3_fck, CK_242X),
194 CLK(NULL, "mspro_ick", &mspro_ick, CK_243X | CK_242X),
195 CLK(NULL, "mspro_fck", &mspro_fck, CK_243X | CK_242X),
196 CLK("mmci-omap.0", "ick", &mmc_ick, CK_242X),
197 CLK("mmci-omap.0", "fck", &mmc_fck, CK_242X),
198 CLK(NULL, "fac_ick", &fac_ick, CK_243X | CK_242X),
199 CLK(NULL, "fac_fck", &fac_fck, CK_243X | CK_242X),
200 CLK(NULL, "eac_ick", &eac_ick, CK_242X),
201 CLK(NULL, "eac_fck", &eac_fck, CK_242X),
202 CLK("omap_hdq.0", "ick", &hdq_ick, CK_243X | CK_242X),
203 CLK("omap_hdq.1", "fck", &hdq_fck, CK_243X | CK_242X),
204 CLK("i2c_omap.1", "ick", &i2c1_ick, CK_243X | CK_242X),
205 CLK("i2c_omap.1", "fck", &i2c1_fck, CK_242X),
206 CLK("i2c_omap.1", "fck", &i2chs1_fck, CK_243X),
207 CLK("i2c_omap.2", "ick", &i2c2_ick, CK_243X | CK_242X),
208 CLK("i2c_omap.2", "fck", &i2c2_fck, CK_242X),
209 CLK("i2c_omap.2", "fck", &i2chs2_fck, CK_243X),
210 CLK(NULL, "gpmc_fck", &gpmc_fck, CK_243X | CK_242X),
211 CLK(NULL, "sdma_fck", &sdma_fck, CK_243X | CK_242X),
212 CLK(NULL, "sdma_ick", &sdma_ick, CK_243X | CK_242X),
213 CLK(NULL, "vlynq_ick", &vlynq_ick, CK_242X),
214 CLK(NULL, "vlynq_fck", &vlynq_fck, CK_242X),
215 CLK(NULL, "sdrc_ick", &sdrc_ick, CK_243X),
216 CLK(NULL, "des_ick", &des_ick, CK_243X | CK_242X),
217 CLK(NULL, "sha_ick", &sha_ick, CK_243X | CK_242X),
218 CLK("omap_rng", "ick", &rng_ick, CK_243X | CK_242X),
219 CLK(NULL, "aes_ick", &aes_ick, CK_243X | CK_242X),
220 CLK(NULL, "pka_ick", &pka_ick, CK_243X | CK_242X),
221 CLK(NULL, "usb_fck", &usb_fck, CK_243X | CK_242X),
222 CLK("musb_hdrc", "ick", &usbhs_ick, CK_243X),
223 CLK("mmci-omap-hs.0", "ick", &mmchs1_ick, CK_243X),
224 CLK("mmci-omap-hs.0", "fck", &mmchs1_fck, CK_243X),
225 CLK("mmci-omap-hs.1", "ick", &mmchs2_ick, CK_243X),
226 CLK("mmci-omap-hs.1", "fck", &mmchs2_fck, CK_243X),
227 CLK(NULL, "gpio5_ick", &gpio5_ick, CK_243X),
228 CLK(NULL, "gpio5_fck", &gpio5_fck, CK_243X),
229 CLK(NULL, "mdm_intc_ick", &mdm_intc_ick, CK_243X),
230 CLK("mmci-omap-hs.0", "mmchsdb_fck", &mmchsdb1_fck, CK_243X),
231 CLK("mmci-omap-hs.1", "mmchsdb_fck", &mmchsdb2_fck, CK_243X),
232 };
233
234 /* CM_CLKEN_PLL.EN_{54,96}M_PLL options (24XX) */
235 #define EN_APLL_STOPPED 0
236 #define EN_APLL_LOCKED 3
237
238 /* CM_CLKSEL1_PLL.APLLS_CLKIN options (24XX) */
239 #define APLLS_CLKIN_19_2MHZ 0
240 #define APLLS_CLKIN_13MHZ 2
241 #define APLLS_CLKIN_12MHZ 3
242
243 /* #define DOWN_VARIABLE_DPLL 1 */ /* Experimental */
244
245 static struct prcm_config *curr_prcm_set;
246 static struct clk *vclk;
247 static struct clk *sclk;
248
249 static void __iomem *prcm_clksrc_ctrl;
250
251 /*-------------------------------------------------------------------------
252 * Omap24xx specific clock functions
253 *-------------------------------------------------------------------------*/
254
255 /**
256 * omap2430_clk_i2chs_find_idlest - return CM_IDLEST info for 2430 I2CHS
257 * @clk: struct clk * being enabled
258 * @idlest_reg: void __iomem ** to store CM_IDLEST reg address into
259 * @idlest_bit: pointer to a u8 to store the CM_IDLEST bit shift into
260 *
261 * OMAP2430 I2CHS CM_IDLEST bits are in CM_IDLEST1_CORE, but the
262 * CM_*CLKEN bits are in CM_{I,F}CLKEN2_CORE. This custom function
263 * passes back the correct CM_IDLEST register address for I2CHS
264 * modules. No return value.
265 */
266 static void omap2430_clk_i2chs_find_idlest(struct clk *clk,
267 void __iomem **idlest_reg,
268 u8 *idlest_bit)
269 {
270 *idlest_reg = OMAP_CM_REGADDR(CORE_MOD, CM_IDLEST);
271 *idlest_bit = clk->enable_bit;
272 }
273
274
275 /**
276 * omap2xxx_clk_get_core_rate - return the CORE_CLK rate
277 * @clk: pointer to the combined dpll_ck + core_ck (currently "dpll_ck")
278 *
279 * Returns the CORE_CLK rate. CORE_CLK can have one of three rate
280 * sources on OMAP2xxx: the DPLL CLKOUT rate, DPLL CLKOUTX2, or 32KHz
281 * (the latter is unusual). This currently should be called with
282 * struct clk *dpll_ck, which is a composite clock of dpll_ck and
283 * core_ck.
284 */
285 static unsigned long omap2xxx_clk_get_core_rate(struct clk *clk)
286 {
287 long long core_clk;
288 u32 v;
289
290 core_clk = omap2_get_dpll_rate(clk);
291
292 v = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
293 v &= OMAP24XX_CORE_CLK_SRC_MASK;
294
295 if (v == CORE_CLK_SRC_32K)
296 core_clk = 32768;
297 else
298 core_clk *= v;
299
300 return core_clk;
301 }
302
303 static int omap2_enable_osc_ck(struct clk *clk)
304 {
305 u32 pcc;
306
307 pcc = __raw_readl(prcm_clksrc_ctrl);
308
309 __raw_writel(pcc & ~OMAP_AUTOEXTCLKMODE_MASK, prcm_clksrc_ctrl);
310
311 return 0;
312 }
313
314 static void omap2_disable_osc_ck(struct clk *clk)
315 {
316 u32 pcc;
317
318 pcc = __raw_readl(prcm_clksrc_ctrl);
319
320 __raw_writel(pcc | OMAP_AUTOEXTCLKMODE_MASK, prcm_clksrc_ctrl);
321 }
322
323 static const struct clkops clkops_oscck = {
324 .enable = &omap2_enable_osc_ck,
325 .disable = &omap2_disable_osc_ck,
326 };
327
328 #ifdef OLD_CK
329 /* Recalculate SYST_CLK */
330 static void omap2_sys_clk_recalc(struct clk * clk)
331 {
332 u32 div = PRCM_CLKSRC_CTRL;
333 div &= (1 << 7) | (1 << 6); /* Test if ext clk divided by 1 or 2 */
334 div >>= clk->rate_offset;
335 clk->rate = (clk->parent->rate / div);
336 propagate_rate(clk);
337 }
338 #endif /* OLD_CK */
339
340 /* Enable an APLL if off */
341 static int omap2_clk_fixed_enable(struct clk *clk)
342 {
343 u32 cval, apll_mask;
344
345 apll_mask = EN_APLL_LOCKED << clk->enable_bit;
346
347 cval = cm_read_mod_reg(PLL_MOD, CM_CLKEN);
348
349 if ((cval & apll_mask) == apll_mask)
350 return 0; /* apll already enabled */
351
352 cval &= ~apll_mask;
353 cval |= apll_mask;
354 cm_write_mod_reg(cval, PLL_MOD, CM_CLKEN);
355
356 if (clk == &apll96_ck)
357 cval = OMAP24XX_ST_96M_APLL;
358 else if (clk == &apll54_ck)
359 cval = OMAP24XX_ST_54M_APLL;
360
361 omap2_cm_wait_idlest(OMAP_CM_REGADDR(PLL_MOD, CM_IDLEST), cval,
362 clk->name);
363
364 /*
365 * REVISIT: Should we return an error code if omap2_wait_clock_ready()
366 * fails?
367 */
368 return 0;
369 }
370
371 /* Stop APLL */
372 static void omap2_clk_fixed_disable(struct clk *clk)
373 {
374 u32 cval;
375
376 cval = cm_read_mod_reg(PLL_MOD, CM_CLKEN);
377 cval &= ~(EN_APLL_LOCKED << clk->enable_bit);
378 cm_write_mod_reg(cval, PLL_MOD, CM_CLKEN);
379 }
380
381 static const struct clkops clkops_fixed = {
382 .enable = &omap2_clk_fixed_enable,
383 .disable = &omap2_clk_fixed_disable,
384 };
385
386 /*
387 * Uses the current prcm set to tell if a rate is valid.
388 * You can go slower, but not faster within a given rate set.
389 */
390 static long omap2_dpllcore_round_rate(unsigned long target_rate)
391 {
392 u32 high, low, core_clk_src;
393
394 core_clk_src = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
395 core_clk_src &= OMAP24XX_CORE_CLK_SRC_MASK;
396
397 if (core_clk_src == CORE_CLK_SRC_DPLL) { /* DPLL clockout */
398 high = curr_prcm_set->dpll_speed * 2;
399 low = curr_prcm_set->dpll_speed;
400 } else { /* DPLL clockout x 2 */
401 high = curr_prcm_set->dpll_speed;
402 low = curr_prcm_set->dpll_speed / 2;
403 }
404
405 #ifdef DOWN_VARIABLE_DPLL
406 if (target_rate > high)
407 return high;
408 else
409 return target_rate;
410 #else
411 if (target_rate > low)
412 return high;
413 else
414 return low;
415 #endif
416
417 }
418
419 static unsigned long omap2_dpllcore_recalc(struct clk *clk)
420 {
421 return omap2xxx_clk_get_core_rate(clk);
422 }
423
424 static int omap2_reprogram_dpllcore(struct clk *clk, unsigned long rate)
425 {
426 u32 cur_rate, low, mult, div, valid_rate, done_rate;
427 u32 bypass = 0;
428 struct prcm_config tmpset;
429 const struct dpll_data *dd;
430
431 cur_rate = omap2xxx_clk_get_core_rate(&dpll_ck);
432 mult = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
433 mult &= OMAP24XX_CORE_CLK_SRC_MASK;
434
435 if ((rate == (cur_rate / 2)) && (mult == 2)) {
436 omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL, 1);
437 } else if ((rate == (cur_rate * 2)) && (mult == 1)) {
438 omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL_X2, 1);
439 } else if (rate != cur_rate) {
440 valid_rate = omap2_dpllcore_round_rate(rate);
441 if (valid_rate != rate)
442 return -EINVAL;
443
444 if (mult == 1)
445 low = curr_prcm_set->dpll_speed;
446 else
447 low = curr_prcm_set->dpll_speed / 2;
448
449 dd = clk->dpll_data;
450 if (!dd)
451 return -EINVAL;
452
453 tmpset.cm_clksel1_pll = __raw_readl(dd->mult_div1_reg);
454 tmpset.cm_clksel1_pll &= ~(dd->mult_mask |
455 dd->div1_mask);
456 div = ((curr_prcm_set->xtal_speed / 1000000) - 1);
457 tmpset.cm_clksel2_pll = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
458 tmpset.cm_clksel2_pll &= ~OMAP24XX_CORE_CLK_SRC_MASK;
459 if (rate > low) {
460 tmpset.cm_clksel2_pll |= CORE_CLK_SRC_DPLL_X2;
461 mult = ((rate / 2) / 1000000);
462 done_rate = CORE_CLK_SRC_DPLL_X2;
463 } else {
464 tmpset.cm_clksel2_pll |= CORE_CLK_SRC_DPLL;
465 mult = (rate / 1000000);
466 done_rate = CORE_CLK_SRC_DPLL;
467 }
468 tmpset.cm_clksel1_pll |= (div << __ffs(dd->mult_mask));
469 tmpset.cm_clksel1_pll |= (mult << __ffs(dd->div1_mask));
470
471 /* Worst case */
472 tmpset.base_sdrc_rfr = SDRC_RFR_CTRL_BYPASS;
473
474 if (rate == curr_prcm_set->xtal_speed) /* If asking for 1-1 */
475 bypass = 1;
476
477 /* For omap2xxx_sdrc_init_params() */
478 omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL_X2, 1);
479
480 /* Force dll lock mode */
481 omap2_set_prcm(tmpset.cm_clksel1_pll, tmpset.base_sdrc_rfr,
482 bypass);
483
484 /* Errata: ret dll entry state */
485 omap2xxx_sdrc_init_params(omap2xxx_sdrc_dll_is_unlocked());
486 omap2xxx_sdrc_reprogram(done_rate, 0);
487 }
488
489 return 0;
490 }
491
492 /**
493 * omap2_table_mpu_recalc - just return the MPU speed
494 * @clk: virt_prcm_set struct clk
495 *
496 * Set virt_prcm_set's rate to the mpu_speed field of the current PRCM set.
497 */
498 static unsigned long omap2_table_mpu_recalc(struct clk *clk)
499 {
500 return curr_prcm_set->mpu_speed;
501 }
502
503 /*
504 * Look for a rate equal or less than the target rate given a configuration set.
505 *
506 * What's not entirely clear is "which" field represents the key field.
507 * Some might argue L3-DDR, others ARM, others IVA. This code is simple and
508 * just uses the ARM rates.
509 */
510 static long omap2_round_to_table_rate(struct clk *clk, unsigned long rate)
511 {
512 struct prcm_config *ptr;
513 long highest_rate;
514
515 if (clk != &virt_prcm_set)
516 return -EINVAL;
517
518 highest_rate = -EINVAL;
519
520 for (ptr = rate_table; ptr->mpu_speed; ptr++) {
521 if (!(ptr->flags & cpu_mask))
522 continue;
523 if (ptr->xtal_speed != sys_ck.rate)
524 continue;
525
526 highest_rate = ptr->mpu_speed;
527
528 /* Can check only after xtal frequency check */
529 if (ptr->mpu_speed <= rate)
530 break;
531 }
532 return highest_rate;
533 }
534
535 /* Sets basic clocks based on the specified rate */
536 static int omap2_select_table_rate(struct clk *clk, unsigned long rate)
537 {
538 u32 cur_rate, done_rate, bypass = 0, tmp;
539 struct prcm_config *prcm;
540 unsigned long found_speed = 0;
541 unsigned long flags;
542
543 if (clk != &virt_prcm_set)
544 return -EINVAL;
545
546 for (prcm = rate_table; prcm->mpu_speed; prcm++) {
547 if (!(prcm->flags & cpu_mask))
548 continue;
549
550 if (prcm->xtal_speed != sys_ck.rate)
551 continue;
552
553 if (prcm->mpu_speed <= rate) {
554 found_speed = prcm->mpu_speed;
555 break;
556 }
557 }
558
559 if (!found_speed) {
560 printk(KERN_INFO "Could not set MPU rate to %luMHz\n",
561 rate / 1000000);
562 return -EINVAL;
563 }
564
565 curr_prcm_set = prcm;
566 cur_rate = omap2xxx_clk_get_core_rate(&dpll_ck);
567
568 if (prcm->dpll_speed == cur_rate / 2) {
569 omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL, 1);
570 } else if (prcm->dpll_speed == cur_rate * 2) {
571 omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL_X2, 1);
572 } else if (prcm->dpll_speed != cur_rate) {
573 local_irq_save(flags);
574
575 if (prcm->dpll_speed == prcm->xtal_speed)
576 bypass = 1;
577
578 if ((prcm->cm_clksel2_pll & OMAP24XX_CORE_CLK_SRC_MASK) ==
579 CORE_CLK_SRC_DPLL_X2)
580 done_rate = CORE_CLK_SRC_DPLL_X2;
581 else
582 done_rate = CORE_CLK_SRC_DPLL;
583
584 /* MPU divider */
585 cm_write_mod_reg(prcm->cm_clksel_mpu, MPU_MOD, CM_CLKSEL);
586
587 /* dsp + iva1 div(2420), iva2.1(2430) */
588 cm_write_mod_reg(prcm->cm_clksel_dsp,
589 OMAP24XX_DSP_MOD, CM_CLKSEL);
590
591 cm_write_mod_reg(prcm->cm_clksel_gfx, GFX_MOD, CM_CLKSEL);
592
593 /* Major subsystem dividers */
594 tmp = cm_read_mod_reg(CORE_MOD, CM_CLKSEL1) & OMAP24XX_CLKSEL_DSS2_MASK;
595 cm_write_mod_reg(prcm->cm_clksel1_core | tmp, CORE_MOD,
596 CM_CLKSEL1);
597
598 if (cpu_is_omap2430())
599 cm_write_mod_reg(prcm->cm_clksel_mdm,
600 OMAP2430_MDM_MOD, CM_CLKSEL);
601
602 /* x2 to enter omap2xxx_sdrc_init_params() */
603 omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL_X2, 1);
604
605 omap2_set_prcm(prcm->cm_clksel1_pll, prcm->base_sdrc_rfr,
606 bypass);
607
608 omap2xxx_sdrc_init_params(omap2xxx_sdrc_dll_is_unlocked());
609 omap2xxx_sdrc_reprogram(done_rate, 0);
610
611 local_irq_restore(flags);
612 }
613
614 return 0;
615 }
616
617 #ifdef CONFIG_CPU_FREQ
618 /*
619 * Walk PRCM rate table and fillout cpufreq freq_table
620 */
621 static struct cpufreq_frequency_table freq_table[ARRAY_SIZE(rate_table)];
622
623 void omap2_clk_init_cpufreq_table(struct cpufreq_frequency_table **table)
624 {
625 struct prcm_config *prcm;
626 int i = 0;
627
628 for (prcm = rate_table; prcm->mpu_speed; prcm++) {
629 if (!(prcm->flags & cpu_mask))
630 continue;
631 if (prcm->xtal_speed != sys_ck.rate)
632 continue;
633
634 /* don't put bypass rates in table */
635 if (prcm->dpll_speed == prcm->xtal_speed)
636 continue;
637
638 freq_table[i].index = i;
639 freq_table[i].frequency = prcm->mpu_speed / 1000;
640 i++;
641 }
642
643 if (i == 0) {
644 printk(KERN_WARNING "%s: failed to initialize frequency "
645 "table\n", __func__);
646 return;
647 }
648
649 freq_table[i].index = i;
650 freq_table[i].frequency = CPUFREQ_TABLE_END;
651
652 *table = &freq_table[0];
653 }
654 #endif
655
656 static struct clk_functions omap2_clk_functions = {
657 .clk_enable = omap2_clk_enable,
658 .clk_disable = omap2_clk_disable,
659 .clk_round_rate = omap2_clk_round_rate,
660 .clk_set_rate = omap2_clk_set_rate,
661 .clk_set_parent = omap2_clk_set_parent,
662 .clk_disable_unused = omap2_clk_disable_unused,
663 #ifdef CONFIG_CPU_FREQ
664 .clk_init_cpufreq_table = omap2_clk_init_cpufreq_table,
665 #endif
666 };
667
668 static u32 omap2_get_apll_clkin(void)
669 {
670 u32 aplls, srate = 0;
671
672 aplls = cm_read_mod_reg(PLL_MOD, CM_CLKSEL1);
673 aplls &= OMAP24XX_APLLS_CLKIN_MASK;
674 aplls >>= OMAP24XX_APLLS_CLKIN_SHIFT;
675
676 if (aplls == APLLS_CLKIN_19_2MHZ)
677 srate = 19200000;
678 else if (aplls == APLLS_CLKIN_13MHZ)
679 srate = 13000000;
680 else if (aplls == APLLS_CLKIN_12MHZ)
681 srate = 12000000;
682
683 return srate;
684 }
685
686 static u32 omap2_get_sysclkdiv(void)
687 {
688 u32 div;
689
690 div = __raw_readl(prcm_clksrc_ctrl);
691 div &= OMAP_SYSCLKDIV_MASK;
692 div >>= OMAP_SYSCLKDIV_SHIFT;
693
694 return div;
695 }
696
697 static unsigned long omap2_osc_clk_recalc(struct clk *clk)
698 {
699 return omap2_get_apll_clkin() * omap2_get_sysclkdiv();
700 }
701
702 static unsigned long omap2_sys_clk_recalc(struct clk *clk)
703 {
704 return clk->parent->rate / omap2_get_sysclkdiv();
705 }
706
707 /*
708 * Set clocks for bypass mode for reboot to work.
709 */
710 void omap2_clk_prepare_for_reboot(void)
711 {
712 u32 rate;
713
714 if (vclk == NULL || sclk == NULL)
715 return;
716
717 rate = clk_get_rate(sclk);
718 clk_set_rate(vclk, rate);
719 }
720
721 /*
722 * Switch the MPU rate if specified on cmdline.
723 * We cannot do this early until cmdline is parsed.
724 */
725 static int __init omap2_clk_arch_init(void)
726 {
727 if (!mpurate)
728 return -EINVAL;
729
730 if (clk_set_rate(&virt_prcm_set, mpurate))
731 printk(KERN_ERR "Could not find matching MPU rate\n");
732
733 recalculate_root_clocks();
734
735 printk(KERN_INFO "Switched to new clocking rate (Crystal/DPLL/MPU): "
736 "%ld.%01ld/%ld/%ld MHz\n",
737 (sys_ck.rate / 1000000), (sys_ck.rate / 100000) % 10,
738 (dpll_ck.rate / 1000000), (mpu_ck.rate / 1000000)) ;
739
740 return 0;
741 }
742 arch_initcall(omap2_clk_arch_init);
743
744 int __init omap2_clk_init(void)
745 {
746 struct prcm_config *prcm;
747 struct omap_clk *c;
748 u32 clkrate;
749
750 if (cpu_is_omap242x()) {
751 prcm_clksrc_ctrl = OMAP2420_PRCM_CLKSRC_CTRL;
752 cpu_mask = RATE_IN_242X;
753 } else if (cpu_is_omap2430()) {
754 prcm_clksrc_ctrl = OMAP2430_PRCM_CLKSRC_CTRL;
755 cpu_mask = RATE_IN_243X;
756 }
757
758 clk_init(&omap2_clk_functions);
759
760 for (c = omap24xx_clks; c < omap24xx_clks + ARRAY_SIZE(omap24xx_clks); c++)
761 clk_preinit(c->lk.clk);
762
763 osc_ck.rate = omap2_osc_clk_recalc(&osc_ck);
764 propagate_rate(&osc_ck);
765 sys_ck.rate = omap2_sys_clk_recalc(&sys_ck);
766 propagate_rate(&sys_ck);
767
768 for (c = omap24xx_clks; c < omap24xx_clks + ARRAY_SIZE(omap24xx_clks); c++)
769 if (c->cpu & cpu_mask) {
770 clkdev_add(&c->lk);
771 clk_register(c->lk.clk);
772 omap2_init_clk_clkdm(c->lk.clk);
773 }
774
775 /* Check the MPU rate set by bootloader */
776 clkrate = omap2xxx_clk_get_core_rate(&dpll_ck);
777 for (prcm = rate_table; prcm->mpu_speed; prcm++) {
778 if (!(prcm->flags & cpu_mask))
779 continue;
780 if (prcm->xtal_speed != sys_ck.rate)
781 continue;
782 if (prcm->dpll_speed <= clkrate)
783 break;
784 }
785 curr_prcm_set = prcm;
786
787 recalculate_root_clocks();
788
789 printk(KERN_INFO "Clocking rate (Crystal/DPLL/MPU): "
790 "%ld.%01ld/%ld/%ld MHz\n",
791 (sys_ck.rate / 1000000), (sys_ck.rate / 100000) % 10,
792 (dpll_ck.rate / 1000000), (mpu_ck.rate / 1000000)) ;
793
794 /*
795 * Only enable those clocks we will need, let the drivers
796 * enable other clocks as necessary
797 */
798 clk_enable_init_clocks();
799
800 /* Avoid sleeping sleeping during omap2_clk_prepare_for_reboot() */
801 vclk = clk_get(NULL, "virt_prcm_set");
802 sclk = clk_get(NULL, "sys_ck");
803
804 return 0;
805 }
Linux for Ginger Game Console