git.oblomov.eu Git - linux-2.6/blob - arch/arm/mach-omap2/clock24xx.c

   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 <mach/clock.h>
  32 #include <mach/sram.h>
  33 #include <asm/div64.h>
  34 #include <asm/clkdev.h>
  35
  36 #include <mach/sdrc.h>
  37 #include "clock.h"
  38 #include "prm.h"
  39 #include "prm-regbits-24xx.h"
  40 #include "cm.h"
  41 #include "cm-regbits-24xx.h"
  42
  43 static const struct clkops clkops_oscck;
  44 static const struct clkops clkops_fixed;
  45
  46 #include "clock24xx.h"
  47
  48 struct omap_clk {
  49         u32             cpu;
  50         struct clk_lookup lk;
  51 };
  52
  53 #define CLK(dev, con, ck, cp)           \
  54         {                               \
  55                  .cpu = cp,             \
  56                 .lk = {                 \
  57                         .dev_id = dev,  \
  58                         .con_id = con,  \
  59                         .clk = ck,      \
  60                 },                      \
  61         }
  62
  63 #define CK_243X                 RATE_IN_243X
  64 #define CK_242X                 RATE_IN_242X
  65
  66 static struct omap_clk omap24xx_clks[] = {
  67         /* external root sources */
  68         CLK(NULL,       "func_32k_ck",  &func_32k_ck,   CK_243X | CK_242X),
  69         CLK(NULL,       "secure_32k_ck", &secure_32k_ck, CK_243X | CK_242X),
  70         CLK(NULL,       "osc_ck",       &osc_ck,        CK_243X | CK_242X),
  71         CLK(NULL,       "sys_ck",       &sys_ck,        CK_243X | CK_242X),
  72         CLK(NULL,       "alt_ck",       &alt_ck,        CK_243X | CK_242X),
  73         /* internal analog sources */
  74         CLK(NULL,       "dpll_ck",      &dpll_ck,       CK_243X | CK_242X),
  75         CLK(NULL,       "apll96_ck",    &apll96_ck,     CK_243X | CK_242X),
  76         CLK(NULL,       "apll54_ck",    &apll54_ck,     CK_243X | CK_242X),
  77         /* internal prcm root sources */
  78         CLK(NULL,       "func_54m_ck",  &func_54m_ck,   CK_243X | CK_242X),
  79         CLK(NULL,       "core_ck",      &core_ck,       CK_243X | CK_242X),
  80         CLK(NULL,       "func_96m_ck",  &func_96m_ck,   CK_243X | CK_242X),
  81         CLK(NULL,       "func_48m_ck",  &func_48m_ck,   CK_243X | CK_242X),
  82         CLK(NULL,       "func_12m_ck",  &func_12m_ck,   CK_243X | CK_242X),
  83         CLK(NULL,       "ck_wdt1_osc",  &wdt1_osc_ck,   CK_243X | CK_242X),
  84         CLK(NULL,       "sys_clkout_src", &sys_clkout_src, CK_243X | CK_242X),
  85         CLK(NULL,       "sys_clkout",   &sys_clkout,    CK_243X | CK_242X),
  86         CLK(NULL,       "sys_clkout2_src", &sys_clkout2_src, CK_242X),
  87         CLK(NULL,       "sys_clkout2",  &sys_clkout2,   CK_242X),
  88         CLK(NULL,       "emul_ck",      &emul_ck,       CK_242X),
  89         /* mpu domain clocks */
  90         CLK(NULL,       "mpu_ck",       &mpu_ck,        CK_243X | CK_242X),
  91         /* dsp domain clocks */
  92         CLK(NULL,       "dsp_fck",      &dsp_fck,       CK_243X | CK_242X),
  93         CLK(NULL,       "dsp_irate_ick", &dsp_irate_ick, CK_243X | CK_242X),
  94         CLK(NULL,       "dsp_ick",      &dsp_ick,       CK_242X),
  95         CLK(NULL,       "iva2_1_ick",   &iva2_1_ick,    CK_243X),
  96         CLK(NULL,       "iva1_ifck",    &iva1_ifck,     CK_242X),
  97         CLK(NULL,       "iva1_mpu_int_ifck", &iva1_mpu_int_ifck, CK_242X),
  98         /* GFX domain clocks */
  99         CLK(NULL,       "gfx_3d_fck",   &gfx_3d_fck,    CK_243X | CK_242X),
 100         CLK(NULL,       "gfx_2d_fck",   &gfx_2d_fck,    CK_243X | CK_242X),
 101         CLK(NULL,       "gfx_ick",      &gfx_ick,       CK_243X | CK_242X),
 102         /* Modem domain clocks */
 103         CLK(NULL,       "mdm_ick",      &mdm_ick,       CK_243X),
 104         CLK(NULL,       "mdm_osc_ck",   &mdm_osc_ck,    CK_243X),
 105         /* DSS domain clocks */
 106         CLK("omapfb",   "ick",          &dss_ick,       CK_243X | CK_242X),
 107         CLK("omapfb",   "dss1_fck",     &dss1_fck,      CK_243X | CK_242X),
 108         CLK("omapfb",   "dss2_fck",     &dss2_fck,      CK_243X | CK_242X),
 109         CLK("omapfb",   "tv_fck",       &dss_54m_fck,   CK_243X | CK_242X),
 110         /* L3 domain clocks */
 111         CLK(NULL,       "core_l3_ck",   &core_l3_ck,    CK_243X | CK_242X),
 112         CLK(NULL,       "ssi_fck",      &ssi_ssr_sst_fck, CK_243X | CK_242X),
 113         CLK(NULL,       "usb_l4_ick",   &usb_l4_ick,    CK_243X | CK_242X),
 114         /* L4 domain clocks */
 115         CLK(NULL,       "l4_ck",        &l4_ck,         CK_243X | CK_242X),
 116         CLK(NULL,       "ssi_l4_ick",   &ssi_l4_ick,    CK_243X | CK_242X),
 117         /* virtual meta-group clock */
 118         CLK(NULL,       "virt_prcm_set", &virt_prcm_set, CK_243X | CK_242X),
 119         /* general l4 interface ck, multi-parent functional clk */
 120         CLK(NULL,       "gpt1_ick",     &gpt1_ick,      CK_243X | CK_242X),
 121         CLK(NULL,       "gpt1_fck",     &gpt1_fck,      CK_243X | CK_242X),
 122         CLK(NULL,       "gpt2_ick",     &gpt2_ick,      CK_243X | CK_242X),
 123         CLK(NULL,       "gpt2_fck",     &gpt2_fck,      CK_243X | CK_242X),
 124         CLK(NULL,       "gpt3_ick",     &gpt3_ick,      CK_243X | CK_242X),
 125         CLK(NULL,       "gpt3_fck",     &gpt3_fck,      CK_243X | CK_242X),
 126         CLK(NULL,       "gpt4_ick",     &gpt4_ick,      CK_243X | CK_242X),
 127         CLK(NULL,       "gpt4_fck",     &gpt4_fck,      CK_243X | CK_242X),
 128         CLK(NULL,       "gpt5_ick",     &gpt5_ick,      CK_243X | CK_242X),
 129         CLK(NULL,       "gpt5_fck",     &gpt5_fck,      CK_243X | CK_242X),
 130         CLK(NULL,       "gpt6_ick",     &gpt6_ick,      CK_243X | CK_242X),
 131         CLK(NULL,       "gpt6_fck",     &gpt6_fck,      CK_243X | CK_242X),
 132         CLK(NULL,       "gpt7_ick",     &gpt7_ick,      CK_243X | CK_242X),
 133         CLK(NULL,       "gpt7_fck",     &gpt7_fck,      CK_243X | CK_242X),
 134         CLK(NULL,       "gpt8_ick",     &gpt8_ick,      CK_243X | CK_242X),
 135         CLK(NULL,       "gpt8_fck",     &gpt8_fck,      CK_243X | CK_242X),
 136         CLK(NULL,       "gpt9_ick",     &gpt9_ick,      CK_243X | CK_242X),
 137         CLK(NULL,       "gpt9_fck",     &gpt9_fck,      CK_243X | CK_242X),
 138         CLK(NULL,       "gpt10_ick",    &gpt10_ick,     CK_243X | CK_242X),
 139         CLK(NULL,       "gpt10_fck",    &gpt10_fck,     CK_243X | CK_242X),
 140         CLK(NULL,       "gpt11_ick",    &gpt11_ick,     CK_243X | CK_242X),
 141         CLK(NULL,       "gpt11_fck",    &gpt11_fck,     CK_243X | CK_242X),
 142         CLK(NULL,       "gpt12_ick",    &gpt12_ick,     CK_243X | CK_242X),
 143         CLK(NULL,       "gpt12_fck",    &gpt12_fck,     CK_243X | CK_242X),
 144         CLK("omap-mcbsp.1", "ick",      &mcbsp1_ick,    CK_243X | CK_242X),
 145         CLK("omap-mcbsp.1", "fck",      &mcbsp1_fck,    CK_243X | CK_242X),
 146         CLK("omap-mcbsp.2", "ick",      &mcbsp2_ick,    CK_243X | CK_242X),
 147         CLK("omap-mcbsp.2", "fck",      &mcbsp2_fck,    CK_243X | CK_242X),
 148         CLK("omap-mcbsp.3", "ick",      &mcbsp3_ick,    CK_243X),
 149         CLK("omap-mcbsp.3", "fck",      &mcbsp3_fck,    CK_243X),
 150         CLK("omap-mcbsp.4", "ick",      &mcbsp4_ick,    CK_243X),
 151         CLK("omap-mcbsp.4", "fck",      &mcbsp4_fck,    CK_243X),
 152         CLK("omap-mcbsp.5", "ick",      &mcbsp5_ick,    CK_243X),
 153         CLK("omap-mcbsp.5", "fck",      &mcbsp5_fck,    CK_243X),
 154         CLK("omap2_mcspi.1", "ick",     &mcspi1_ick,    CK_243X | CK_242X),
 155         CLK("omap2_mcspi.1", "fck",     &mcspi1_fck,    CK_243X | CK_242X),
 156         CLK("omap2_mcspi.2", "ick",     &mcspi2_ick,    CK_243X | CK_242X),
 157         CLK("omap2_mcspi.2", "fck",     &mcspi2_fck,    CK_243X | CK_242X),
 158         CLK("omap2_mcspi.3", "ick",     &mcspi3_ick,    CK_243X),
 159         CLK("omap2_mcspi.3", "fck",     &mcspi3_fck,    CK_243X),
 160         CLK(NULL,       "uart1_ick",    &uart1_ick,     CK_243X | CK_242X),
 161         CLK(NULL,       "uart1_fck",    &uart1_fck,     CK_243X | CK_242X),
 162         CLK(NULL,       "uart2_ick",    &uart2_ick,     CK_243X | CK_242X),
 163         CLK(NULL,       "uart2_fck",    &uart2_fck,     CK_243X | CK_242X),
 164         CLK(NULL,       "uart3_ick",    &uart3_ick,     CK_243X | CK_242X),
 165         CLK(NULL,       "uart3_fck",    &uart3_fck,     CK_243X | CK_242X),
 166         CLK(NULL,       "gpios_ick",    &gpios_ick,     CK_243X | CK_242X),
 167         CLK(NULL,       "gpios_fck",    &gpios_fck,     CK_243X | CK_242X),
 168         CLK("omap_wdt", "ick",          &mpu_wdt_ick,   CK_243X | CK_242X),
 169         CLK("omap_wdt", "fck",          &mpu_wdt_fck,   CK_243X | CK_242X),
 170         CLK(NULL,       "sync_32k_ick", &sync_32k_ick,  CK_243X | CK_242X),
 171         CLK(NULL,       "wdt1_ick",     &wdt1_ick,      CK_243X | CK_242X),
 172         CLK(NULL,       "omapctrl_ick", &omapctrl_ick,  CK_243X | CK_242X),
 173         CLK(NULL,       "icr_ick",      &icr_ick,       CK_243X),
 174         CLK("omap24xxcam", "fck",       &cam_fck,       CK_243X | CK_242X),
 175         CLK("omap24xxcam", "ick",       &cam_ick,       CK_243X | CK_242X),
 176         CLK(NULL,       "mailboxes_ick", &mailboxes_ick,        CK_243X | CK_242X),
 177         CLK(NULL,       "wdt4_ick",     &wdt4_ick,      CK_243X | CK_242X),
 178         CLK(NULL,       "wdt4_fck",     &wdt4_fck,      CK_243X | CK_242X),
 179         CLK(NULL,       "wdt3_ick",     &wdt3_ick,      CK_242X),
 180         CLK(NULL,       "wdt3_fck",     &wdt3_fck,      CK_242X),
 181         CLK(NULL,       "mspro_ick",    &mspro_ick,     CK_243X | CK_242X),
 182         CLK(NULL,       "mspro_fck",    &mspro_fck,     CK_243X | CK_242X),
 183         CLK("mmci-omap.0", "ick",       &mmc_ick,       CK_242X),
 184         CLK("mmci-omap.0", "fck",       &mmc_fck,       CK_242X),
 185         CLK(NULL,       "fac_ick",      &fac_ick,       CK_243X | CK_242X),
 186         CLK(NULL,       "fac_fck",      &fac_fck,       CK_243X | CK_242X),
 187         CLK(NULL,       "eac_ick",      &eac_ick,       CK_242X),
 188         CLK(NULL,       "eac_fck",      &eac_fck,       CK_242X),
 189         CLK("omap_hdq.0", "ick",        &hdq_ick,       CK_243X | CK_242X),
 190         CLK("omap_hdq.1", "fck",        &hdq_fck,       CK_243X | CK_242X),
 191         CLK("i2c_omap.1", "ick",        &i2c1_ick,      CK_243X | CK_242X),
 192         CLK("i2c_omap.1", "fck",        &i2c1_fck,      CK_242X),
 193         CLK("i2c_omap.1", "fck",        &i2chs1_fck,    CK_243X),
 194         CLK("i2c_omap.2", "ick",        &i2c2_ick,      CK_243X | CK_242X),
 195         CLK("i2c_omap.2", "fck",        &i2c2_fck,      CK_242X),
 196         CLK("i2c_omap.2", "fck",        &i2chs2_fck,    CK_243X),
 197         CLK(NULL,       "gpmc_fck",     &gpmc_fck,      CK_243X | CK_242X),
 198         CLK(NULL,       "sdma_fck",     &sdma_fck,      CK_243X | CK_242X),
 199         CLK(NULL,       "sdma_ick",     &sdma_ick,      CK_243X | CK_242X),
 200         CLK(NULL,       "vlynq_ick",    &vlynq_ick,     CK_242X),
 201         CLK(NULL,       "vlynq_fck",    &vlynq_fck,     CK_242X),
 202         CLK(NULL,       "sdrc_ick",     &sdrc_ick,      CK_243X),
 203         CLK(NULL,       "des_ick",      &des_ick,       CK_243X | CK_242X),
 204         CLK(NULL,       "sha_ick",      &sha_ick,       CK_243X | CK_242X),
 205         CLK("omap_rng", "ick",          &rng_ick,       CK_243X | CK_242X),
 206         CLK(NULL,       "aes_ick",      &aes_ick,       CK_243X | CK_242X),
 207         CLK(NULL,       "pka_ick",      &pka_ick,       CK_243X | CK_242X),
 208         CLK(NULL,       "usb_fck",      &usb_fck,       CK_243X | CK_242X),
 209         CLK("musb_hdrc",        "ick",  &usbhs_ick,     CK_243X),
 210         CLK("mmci-omap-hs.0", "ick",    &mmchs1_ick,    CK_243X),
 211         CLK("mmci-omap-hs.0", "fck",    &mmchs1_fck,    CK_243X),
 212         CLK("mmci-omap-hs.1", "ick",    &mmchs2_ick,    CK_243X),
 213         CLK("mmci-omap-hs.1", "fck",    &mmchs2_fck,    CK_243X),
 214         CLK(NULL,       "gpio5_ick",    &gpio5_ick,     CK_243X),
 215         CLK(NULL,       "gpio5_fck",    &gpio5_fck,     CK_243X),
 216         CLK(NULL,       "mdm_intc_ick", &mdm_intc_ick,  CK_243X),
 217         CLK("mmci-omap-hs.0", "mmchsdb_fck",    &mmchsdb1_fck,  CK_243X),
 218         CLK("mmci-omap-hs.1", "mmchsdb_fck",    &mmchsdb2_fck,  CK_243X),
 219 };
 220
 221 /* CM_CLKEN_PLL.EN_{54,96}M_PLL options (24XX) */
 222 #define EN_APLL_STOPPED                 0
 223 #define EN_APLL_LOCKED                  3
 224
 225 /* CM_CLKSEL1_PLL.APLLS_CLKIN options (24XX) */
 226 #define APLLS_CLKIN_19_2MHZ             0
 227 #define APLLS_CLKIN_13MHZ               2
 228 #define APLLS_CLKIN_12MHZ               3
 229
 230 /* #define DOWN_VARIABLE_DPLL 1 */              /* Experimental */
 231
 232 static struct prcm_config *curr_prcm_set;
 233 static struct clk *vclk;
 234 static struct clk *sclk;
 235
 236 /*-------------------------------------------------------------------------
 237  * Omap24xx specific clock functions
 238  *-------------------------------------------------------------------------*/
 239
 240 /**
 241  * omap2xxx_clk_get_core_rate - return the CORE_CLK rate
 242  * @clk: pointer to the combined dpll_ck + core_ck (currently "dpll_ck")
 243  *
 244  * Returns the CORE_CLK rate.  CORE_CLK can have one of three rate
 245  * sources on OMAP2xxx: the DPLL CLKOUT rate, DPLL CLKOUTX2, or 32KHz
 246  * (the latter is unusual).  This currently should be called with
 247  * struct clk *dpll_ck, which is a composite clock of dpll_ck and
 248  * core_ck.
 249  */
 250 static unsigned long omap2xxx_clk_get_core_rate(struct clk *clk)
 251 {
 252         long long core_clk;
 253         u32 v;
 254
 255         core_clk = omap2_get_dpll_rate(clk);
 256
 257         v = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
 258         v &= OMAP24XX_CORE_CLK_SRC_MASK;
 259
 260         if (v == CORE_CLK_SRC_32K)
 261                 core_clk = 32768;
 262         else
 263                 core_clk *= v;
 264
 265         return core_clk;
 266 }
 267
 268 static int omap2_enable_osc_ck(struct clk *clk)
 269 {
 270         u32 pcc;
 271
 272         pcc = __raw_readl(OMAP24XX_PRCM_CLKSRC_CTRL);
 273
 274         __raw_writel(pcc & ~OMAP_AUTOEXTCLKMODE_MASK,
 275                       OMAP24XX_PRCM_CLKSRC_CTRL);
 276
 277         return 0;
 278 }
 279
 280 static void omap2_disable_osc_ck(struct clk *clk)
 281 {
 282         u32 pcc;
 283
 284         pcc = __raw_readl(OMAP24XX_PRCM_CLKSRC_CTRL);
 285
 286         __raw_writel(pcc | OMAP_AUTOEXTCLKMODE_MASK,
 287                       OMAP24XX_PRCM_CLKSRC_CTRL);
 288 }
 289
 290 static const struct clkops clkops_oscck = {
 291         .enable         = &omap2_enable_osc_ck,
 292         .disable        = &omap2_disable_osc_ck,
 293 };
 294
 295 #ifdef OLD_CK
 296 /* Recalculate SYST_CLK */
 297 static void omap2_sys_clk_recalc(struct clk * clk)
 298 {
 299         u32 div = PRCM_CLKSRC_CTRL;
 300         div &= (1 << 7) | (1 << 6);     /* Test if ext clk divided by 1 or 2 */
 301         div >>= clk->rate_offset;
 302         clk->rate = (clk->parent->rate / div);
 303         propagate_rate(clk);
 304 }
 305 #endif  /* OLD_CK */
 306
 307 /* Enable an APLL if off */
 308 static int omap2_clk_fixed_enable(struct clk *clk)
 309 {
 310         u32 cval, apll_mask;
 311
 312         apll_mask = EN_APLL_LOCKED << clk->enable_bit;
 313
 314         cval = cm_read_mod_reg(PLL_MOD, CM_CLKEN);
 315
 316         if ((cval & apll_mask) == apll_mask)
 317                 return 0;   /* apll already enabled */
 318
 319         cval &= ~apll_mask;
 320         cval |= apll_mask;
 321         cm_write_mod_reg(cval, PLL_MOD, CM_CLKEN);
 322
 323         if (clk == &apll96_ck)
 324                 cval = OMAP24XX_ST_96M_APLL;
 325         else if (clk == &apll54_ck)
 326                 cval = OMAP24XX_ST_54M_APLL;
 327
 328         omap2_wait_clock_ready(OMAP_CM_REGADDR(PLL_MOD, CM_IDLEST), cval,
 329                             clk->name);
 330
 331         /*
 332          * REVISIT: Should we return an error code if omap2_wait_clock_ready()
 333          * fails?
 334          */
 335         return 0;
 336 }
 337
 338 /* Stop APLL */
 339 static void omap2_clk_fixed_disable(struct clk *clk)
 340 {
 341         u32 cval;
 342
 343         cval = cm_read_mod_reg(PLL_MOD, CM_CLKEN);
 344         cval &= ~(EN_APLL_LOCKED << clk->enable_bit);
 345         cm_write_mod_reg(cval, PLL_MOD, CM_CLKEN);
 346 }
 347
 348 static const struct clkops clkops_fixed = {
 349         .enable         = &omap2_clk_fixed_enable,
 350         .disable        = &omap2_clk_fixed_disable,
 351 };
 352
 353 /*
 354  * Uses the current prcm set to tell if a rate is valid.
 355  * You can go slower, but not faster within a given rate set.
 356  */
 357 static long omap2_dpllcore_round_rate(unsigned long target_rate)
 358 {
 359         u32 high, low, core_clk_src;
 360
 361         core_clk_src = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
 362         core_clk_src &= OMAP24XX_CORE_CLK_SRC_MASK;
 363
 364         if (core_clk_src == CORE_CLK_SRC_DPLL) {        /* DPLL clockout */
 365                 high = curr_prcm_set->dpll_speed * 2;
 366                 low = curr_prcm_set->dpll_speed;
 367         } else {                                /* DPLL clockout x 2 */
 368                 high = curr_prcm_set->dpll_speed;
 369                 low = curr_prcm_set->dpll_speed / 2;
 370         }
 371
 372 #ifdef DOWN_VARIABLE_DPLL
 373         if (target_rate > high)
 374                 return high;
 375         else
 376                 return target_rate;
 377 #else
 378         if (target_rate > low)
 379                 return high;
 380         else
 381                 return low;
 382 #endif
 383
 384 }
 385
 386 static unsigned long omap2_dpllcore_recalc(struct clk *clk)
 387 {
 388         return omap2xxx_clk_get_core_rate(clk);
 389 }
 390
 391 static int omap2_reprogram_dpllcore(struct clk *clk, unsigned long rate)
 392 {
 393         u32 cur_rate, low, mult, div, valid_rate, done_rate;
 394         u32 bypass = 0;
 395         struct prcm_config tmpset;
 396         const struct dpll_data *dd;
 397
 398         cur_rate = omap2xxx_clk_get_core_rate(&dpll_ck);
 399         mult = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
 400         mult &= OMAP24XX_CORE_CLK_SRC_MASK;
 401
 402         if ((rate == (cur_rate / 2)) && (mult == 2)) {
 403                 omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL, 1);
 404         } else if ((rate == (cur_rate * 2)) && (mult == 1)) {
 405                 omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL_X2, 1);
 406         } else if (rate != cur_rate) {
 407                 valid_rate = omap2_dpllcore_round_rate(rate);
 408                 if (valid_rate != rate)
 409                         return -EINVAL;
 410
 411                 if (mult == 1)
 412                         low = curr_prcm_set->dpll_speed;
 413                 else
 414                         low = curr_prcm_set->dpll_speed / 2;
 415
 416                 dd = clk->dpll_data;
 417                 if (!dd)
 418                         return -EINVAL;
 419
 420                 tmpset.cm_clksel1_pll = __raw_readl(dd->mult_div1_reg);
 421                 tmpset.cm_clksel1_pll &= ~(dd->mult_mask |
 422                                            dd->div1_mask);
 423                 div = ((curr_prcm_set->xtal_speed / 1000000) - 1);
 424                 tmpset.cm_clksel2_pll = cm_read_mod_reg(PLL_MOD, CM_CLKSEL2);
 425                 tmpset.cm_clksel2_pll &= ~OMAP24XX_CORE_CLK_SRC_MASK;
 426                 if (rate > low) {
 427                         tmpset.cm_clksel2_pll |= CORE_CLK_SRC_DPLL_X2;
 428                         mult = ((rate / 2) / 1000000);
 429                         done_rate = CORE_CLK_SRC_DPLL_X2;
 430                 } else {
 431                         tmpset.cm_clksel2_pll |= CORE_CLK_SRC_DPLL;
 432                         mult = (rate / 1000000);
 433                         done_rate = CORE_CLK_SRC_DPLL;
 434                 }
 435                 tmpset.cm_clksel1_pll |= (div << __ffs(dd->mult_mask));
 436                 tmpset.cm_clksel1_pll |= (mult << __ffs(dd->div1_mask));
 437
 438                 /* Worst case */
 439                 tmpset.base_sdrc_rfr = SDRC_RFR_CTRL_BYPASS;
 440
 441                 if (rate == curr_prcm_set->xtal_speed)  /* If asking for 1-1 */
 442                         bypass = 1;
 443
 444                 /* For omap2xxx_sdrc_init_params() */
 445                 omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL_X2, 1);
 446
 447                 /* Force dll lock mode */
 448                 omap2_set_prcm(tmpset.cm_clksel1_pll, tmpset.base_sdrc_rfr,
 449                                bypass);
 450
 451                 /* Errata: ret dll entry state */
 452                 omap2xxx_sdrc_init_params(omap2xxx_sdrc_dll_is_unlocked());
 453                 omap2xxx_sdrc_reprogram(done_rate, 0);
 454         }
 455
 456         return 0;
 457 }
 458
 459 /**
 460  * omap2_table_mpu_recalc - just return the MPU speed
 461  * @clk: virt_prcm_set struct clk
 462  *
 463  * Set virt_prcm_set's rate to the mpu_speed field of the current PRCM set.
 464  */
 465 static unsigned long omap2_table_mpu_recalc(struct clk *clk)
 466 {
 467         return curr_prcm_set->mpu_speed;
 468 }
 469
 470 /*
 471  * Look for a rate equal or less than the target rate given a configuration set.
 472  *
 473  * What's not entirely clear is "which" field represents the key field.
 474  * Some might argue L3-DDR, others ARM, others IVA. This code is simple and
 475  * just uses the ARM rates.
 476  */
 477 static long omap2_round_to_table_rate(struct clk *clk, unsigned long rate)
 478 {
 479         struct prcm_config *ptr;
 480         long highest_rate;
 481
 482         if (clk != &virt_prcm_set)
 483                 return -EINVAL;
 484
 485         highest_rate = -EINVAL;
 486
 487         for (ptr = rate_table; ptr->mpu_speed; ptr++) {
 488                 if (!(ptr->flags & cpu_mask))
 489                         continue;
 490                 if (ptr->xtal_speed != sys_ck.rate)
 491                         continue;
 492
 493                 highest_rate = ptr->mpu_speed;
 494
 495                 /* Can check only after xtal frequency check */
 496                 if (ptr->mpu_speed <= rate)
 497                         break;
 498         }
 499         return highest_rate;
 500 }
 501
 502 /* Sets basic clocks based on the specified rate */
 503 static int omap2_select_table_rate(struct clk *clk, unsigned long rate)
 504 {
 505         u32 cur_rate, done_rate, bypass = 0, tmp;
 506         struct prcm_config *prcm;
 507         unsigned long found_speed = 0;
 508         unsigned long flags;
 509
 510         if (clk != &virt_prcm_set)
 511                 return -EINVAL;
 512
 513         for (prcm = rate_table; prcm->mpu_speed; prcm++) {
 514                 if (!(prcm->flags & cpu_mask))
 515                         continue;
 516
 517                 if (prcm->xtal_speed != sys_ck.rate)
 518                         continue;
 519
 520                 if (prcm->mpu_speed <= rate) {
 521                         found_speed = prcm->mpu_speed;
 522                         break;
 523                 }
 524         }
 525
 526         if (!found_speed) {
 527                 printk(KERN_INFO "Could not set MPU rate to %luMHz\n",
 528                        rate / 1000000);
 529                 return -EINVAL;
 530         }
 531
 532         curr_prcm_set = prcm;
 533         cur_rate = omap2xxx_clk_get_core_rate(&dpll_ck);
 534
 535         if (prcm->dpll_speed == cur_rate / 2) {
 536                 omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL, 1);
 537         } else if (prcm->dpll_speed == cur_rate * 2) {
 538                 omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL_X2, 1);
 539         } else if (prcm->dpll_speed != cur_rate) {
 540                 local_irq_save(flags);
 541
 542                 if (prcm->dpll_speed == prcm->xtal_speed)
 543                         bypass = 1;
 544
 545                 if ((prcm->cm_clksel2_pll & OMAP24XX_CORE_CLK_SRC_MASK) ==
 546                     CORE_CLK_SRC_DPLL_X2)
 547                         done_rate = CORE_CLK_SRC_DPLL_X2;
 548                 else
 549                         done_rate = CORE_CLK_SRC_DPLL;
 550
 551                 /* MPU divider */
 552                 cm_write_mod_reg(prcm->cm_clksel_mpu, MPU_MOD, CM_CLKSEL);
 553
 554                 /* dsp + iva1 div(2420), iva2.1(2430) */
 555                 cm_write_mod_reg(prcm->cm_clksel_dsp,
 556                                  OMAP24XX_DSP_MOD, CM_CLKSEL);
 557
 558                 cm_write_mod_reg(prcm->cm_clksel_gfx, GFX_MOD, CM_CLKSEL);
 559
 560                 /* Major subsystem dividers */
 561                 tmp = cm_read_mod_reg(CORE_MOD, CM_CLKSEL1) & OMAP24XX_CLKSEL_DSS2_MASK;
 562                 cm_write_mod_reg(prcm->cm_clksel1_core | tmp, CORE_MOD,
 563                                  CM_CLKSEL1);
 564
 565                 if (cpu_is_omap2430())
 566                         cm_write_mod_reg(prcm->cm_clksel_mdm,
 567                                          OMAP2430_MDM_MOD, CM_CLKSEL);
 568
 569                 /* x2 to enter omap2xxx_sdrc_init_params() */
 570                 omap2xxx_sdrc_reprogram(CORE_CLK_SRC_DPLL_X2, 1);
 571
 572                 omap2_set_prcm(prcm->cm_clksel1_pll, prcm->base_sdrc_rfr,
 573                                bypass);
 574
 575                 omap2xxx_sdrc_init_params(omap2xxx_sdrc_dll_is_unlocked());
 576                 omap2xxx_sdrc_reprogram(done_rate, 0);
 577
 578                 local_irq_restore(flags);
 579         }
 580
 581         return 0;
 582 }
 583
 584 #ifdef CONFIG_CPU_FREQ
 585 /*
 586  * Walk PRCM rate table and fillout cpufreq freq_table
 587  */
 588 static struct cpufreq_frequency_table freq_table[ARRAY_SIZE(rate_table)];
 589
 590 void omap2_clk_init_cpufreq_table(struct cpufreq_frequency_table **table)
 591 {
 592         struct prcm_config *prcm;
 593         int i = 0;
 594
 595         for (prcm = rate_table; prcm->mpu_speed; prcm++) {
 596                 if (!(prcm->flags & cpu_mask))
 597                         continue;
 598                 if (prcm->xtal_speed != sys_ck.rate)
 599                         continue;
 600
 601                 /* don't put bypass rates in table */
 602                 if (prcm->dpll_speed == prcm->xtal_speed)
 603                         continue;
 604
 605                 freq_table[i].index = i;
 606                 freq_table[i].frequency = prcm->mpu_speed / 1000;
 607                 i++;
 608         }
 609
 610         if (i == 0) {
 611                 printk(KERN_WARNING "%s: failed to initialize frequency "
 612                        "table\n", __func__);
 613                 return;
 614         }
 615
 616         freq_table[i].index = i;
 617         freq_table[i].frequency = CPUFREQ_TABLE_END;
 618
 619         *table = &freq_table[0];
 620 }
 621 #endif
 622
 623 static struct clk_functions omap2_clk_functions = {
 624         .clk_enable             = omap2_clk_enable,
 625         .clk_disable            = omap2_clk_disable,
 626         .clk_round_rate         = omap2_clk_round_rate,
 627         .clk_set_rate           = omap2_clk_set_rate,
 628         .clk_set_parent         = omap2_clk_set_parent,
 629         .clk_disable_unused     = omap2_clk_disable_unused,
 630 #ifdef  CONFIG_CPU_FREQ
 631         .clk_init_cpufreq_table = omap2_clk_init_cpufreq_table,
 632 #endif
 633 };
 634
 635 static u32 omap2_get_apll_clkin(void)
 636 {
 637         u32 aplls, srate = 0;
 638
 639         aplls = cm_read_mod_reg(PLL_MOD, CM_CLKSEL1);
 640         aplls &= OMAP24XX_APLLS_CLKIN_MASK;
 641         aplls >>= OMAP24XX_APLLS_CLKIN_SHIFT;
 642
 643         if (aplls == APLLS_CLKIN_19_2MHZ)
 644                 srate = 19200000;
 645         else if (aplls == APLLS_CLKIN_13MHZ)
 646                 srate = 13000000;
 647         else if (aplls == APLLS_CLKIN_12MHZ)
 648                 srate = 12000000;
 649
 650         return srate;
 651 }
 652
 653 static u32 omap2_get_sysclkdiv(void)
 654 {
 655         u32 div;
 656
 657         div = __raw_readl(OMAP24XX_PRCM_CLKSRC_CTRL);
 658         div &= OMAP_SYSCLKDIV_MASK;
 659         div >>= OMAP_SYSCLKDIV_SHIFT;
 660
 661         return div;
 662 }
 663
 664 static unsigned long omap2_osc_clk_recalc(struct clk *clk)
 665 {
 666         return omap2_get_apll_clkin() * omap2_get_sysclkdiv();
 667 }
 668
 669 static unsigned long omap2_sys_clk_recalc(struct clk *clk)
 670 {
 671         return clk->parent->rate / omap2_get_sysclkdiv();
 672 }
 673
 674 /*
 675  * Set clocks for bypass mode for reboot to work.
 676  */
 677 void omap2_clk_prepare_for_reboot(void)
 678 {
 679         u32 rate;
 680
 681         if (vclk == NULL || sclk == NULL)
 682                 return;
 683
 684         rate = clk_get_rate(sclk);
 685         clk_set_rate(vclk, rate);
 686 }
 687
 688 /*
 689  * Switch the MPU rate if specified on cmdline.
 690  * We cannot do this early until cmdline is parsed.
 691  */
 692 static int __init omap2_clk_arch_init(void)
 693 {
 694         if (!mpurate)
 695                 return -EINVAL;
 696
 697         if (clk_set_rate(&virt_prcm_set, mpurate))
 698                 printk(KERN_ERR "Could not find matching MPU rate\n");
 699
 700         recalculate_root_clocks();
 701
 702         printk(KERN_INFO "Switched to new clocking rate (Crystal/DPLL/MPU): "
 703                "%ld.%01ld/%ld/%ld MHz\n",
 704                (sys_ck.rate / 1000000), (sys_ck.rate / 100000) % 10,
 705                (dpll_ck.rate / 1000000), (mpu_ck.rate / 1000000)) ;
 706
 707         return 0;
 708 }
 709 arch_initcall(omap2_clk_arch_init);
 710
 711 int __init omap2_clk_init(void)
 712 {
 713         struct prcm_config *prcm;
 714         struct omap_clk *c;
 715         u32 clkrate;
 716
 717         if (cpu_is_omap242x())
 718                 cpu_mask = RATE_IN_242X;
 719         else if (cpu_is_omap2430())
 720                 cpu_mask = RATE_IN_243X;
 721
 722         clk_init(&omap2_clk_functions);
 723
 724         for (c = omap24xx_clks; c < omap24xx_clks + ARRAY_SIZE(omap24xx_clks); c++)
 725                 clk_init_one(c->lk.clk);
 726
 727         osc_ck.rate = omap2_osc_clk_recalc(&osc_ck);
 728         propagate_rate(&osc_ck);
 729         sys_ck.rate = omap2_sys_clk_recalc(&sys_ck);
 730         propagate_rate(&sys_ck);
 731
 732         for (c = omap24xx_clks; c < omap24xx_clks + ARRAY_SIZE(omap24xx_clks); c++)
 733                 if (c->cpu & cpu_mask) {
 734                         clkdev_add(&c->lk);
 735                         clk_register(c->lk.clk);
 736                 }
 737
 738         /* Check the MPU rate set by bootloader */
 739         clkrate = omap2xxx_clk_get_core_rate(&dpll_ck);
 740         for (prcm = rate_table; prcm->mpu_speed; prcm++) {
 741                 if (!(prcm->flags & cpu_mask))
 742                         continue;
 743                 if (prcm->xtal_speed != sys_ck.rate)
 744                         continue;
 745                 if (prcm->dpll_speed <= clkrate)
 746                          break;
 747         }
 748         curr_prcm_set = prcm;
 749
 750         recalculate_root_clocks();
 751
 752         printk(KERN_INFO "Clocking rate (Crystal/DPLL/MPU): "
 753                "%ld.%01ld/%ld/%ld MHz\n",
 754                (sys_ck.rate / 1000000), (sys_ck.rate / 100000) % 10,
 755                (dpll_ck.rate / 1000000), (mpu_ck.rate / 1000000)) ;
 756
 757         /*
 758          * Only enable those clocks we will need, let the drivers
 759          * enable other clocks as necessary
 760          */
 761         clk_enable_init_clocks();
 762
 763         /* Avoid sleeping sleeping during omap2_clk_prepare_for_reboot() */
 764         vclk = clk_get(NULL, "virt_prcm_set");
 765         sclk = clk_get(NULL, "sys_ck");
 766
 767         return 0;
 768 }