git.oblomov.eu Git - linux-2.6/blob - arch/arm/mach-omap2/clock34xx.c

   1 /*
   2  * OMAP3-specific clock framework functions
   3  *
   4  * Copyright (C) 2007-2008 Texas Instruments, Inc.
   5  * Copyright (C) 2007-2008 Nokia Corporation
   6  *
   7  * Written by Paul Walmsley
   8  * Testing and integration fixes by Jouni Högander
   9  *
  10  * Parts of this code are based on code written by
  11  * Richard Woodruff, Tony Lindgren, Tuukka Tikkanen, Karthik Dasu
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License version 2 as
  15  * published by the Free Software Foundation.
  16  */
  17 #undef DEBUG
  18
  19 #include <linux/module.h>
  20 #include <linux/kernel.h>
  21 #include <linux/device.h>
  22 #include <linux/list.h>
  23 #include <linux/errno.h>
  24 #include <linux/delay.h>
  25 #include <linux/clk.h>
  26 #include <linux/io.h>
  27 #include <linux/limits.h>
  28 #include <linux/bitops.h>
  29
  30 #include <mach/clock.h>
  31 #include <mach/sram.h>
  32 #include <asm/div64.h>
  33 #include <asm/clkdev.h>
  34
  35 #include "memory.h"
  36 #include "clock.h"
  37 #include "prm.h"
  38 #include "prm-regbits-34xx.h"
  39 #include "cm.h"
  40 #include "cm-regbits-34xx.h"
  41
  42 static const struct clkops clkops_noncore_dpll_ops;
  43
  44 #include "clock34xx.h"
  45
  46 struct omap_clk {
  47         u32             cpu;
  48         struct clk_lookup lk;
  49 };
  50
  51 #define CLK(dev, con, ck, cp)           \
  52         {                               \
  53                  .cpu = cp,             \
  54                 .lk = {                 \
  55                         .dev_id = dev,  \
  56                         .con_id = con,  \
  57                         .clk = ck,      \
  58                 },                      \
  59         }
  60
  61 #define CK_343X         (1 << 0)
  62 #define CK_3430ES1      (1 << 1)
  63 #define CK_3430ES2      (1 << 2)
  64
  65 static struct omap_clk omap34xx_clks[] = {
  66         CLK(NULL,       "omap_32k_fck", &omap_32k_fck,  CK_343X),
  67         CLK(NULL,       "virt_12m_ck",  &virt_12m_ck,   CK_343X),
  68         CLK(NULL,       "virt_13m_ck",  &virt_13m_ck,   CK_343X),
  69         CLK(NULL,       "virt_16_8m_ck", &virt_16_8m_ck, CK_3430ES2),
  70         CLK(NULL,       "virt_19_2m_ck", &virt_19_2m_ck, CK_343X),
  71         CLK(NULL,       "virt_26m_ck",  &virt_26m_ck,   CK_343X),
  72         CLK(NULL,       "virt_38_4m_ck", &virt_38_4m_ck, CK_343X),
  73         CLK(NULL,       "osc_sys_ck",   &osc_sys_ck,    CK_343X),
  74         CLK(NULL,       "sys_ck",       &sys_ck,        CK_343X),
  75         CLK(NULL,       "sys_altclk",   &sys_altclk,    CK_343X),
  76         CLK(NULL,       "mcbsp_clks",   &mcbsp_clks,    CK_343X),
  77         CLK(NULL,       "sys_clkout1",  &sys_clkout1,   CK_343X),
  78         CLK(NULL,       "dpll1_ck",     &dpll1_ck,      CK_343X),
  79         CLK(NULL,       "dpll1_x2_ck",  &dpll1_x2_ck,   CK_343X),
  80         CLK(NULL,       "dpll1_x2m2_ck", &dpll1_x2m2_ck, CK_343X),
  81         CLK(NULL,       "dpll2_ck",     &dpll2_ck,      CK_343X),
  82         CLK(NULL,       "dpll2_m2_ck",  &dpll2_m2_ck,   CK_343X),
  83         CLK(NULL,       "dpll3_ck",     &dpll3_ck,      CK_343X),
  84         CLK(NULL,       "core_ck",      &core_ck,       CK_343X),
  85         CLK(NULL,       "dpll3_x2_ck",  &dpll3_x2_ck,   CK_343X),
  86         CLK(NULL,       "dpll3_m2_ck",  &dpll3_m2_ck,   CK_343X),
  87         CLK(NULL,       "dpll3_m2x2_ck", &dpll3_m2x2_ck, CK_343X),
  88         CLK(NULL,       "dpll3_m3_ck",  &dpll3_m3_ck,   CK_343X),
  89         CLK(NULL,       "dpll3_m3x2_ck", &dpll3_m3x2_ck, CK_343X),
  90         CLK(NULL,       "emu_core_alwon_ck", &emu_core_alwon_ck, CK_343X),
  91         CLK(NULL,       "dpll4_ck",     &dpll4_ck,      CK_343X),
  92         CLK(NULL,       "dpll4_x2_ck",  &dpll4_x2_ck,   CK_343X),
  93         CLK(NULL,       "omap_96m_alwon_fck", &omap_96m_alwon_fck, CK_343X),
  94         CLK(NULL,       "omap_96m_fck", &omap_96m_fck,  CK_343X),
  95         CLK(NULL,       "cm_96m_fck",   &cm_96m_fck,    CK_343X),
  96         CLK(NULL,       "virt_omap_54m_fck", &virt_omap_54m_fck, CK_343X),
  97         CLK(NULL,       "omap_54m_fck", &omap_54m_fck,  CK_343X),
  98         CLK(NULL,       "omap_48m_fck", &omap_48m_fck,  CK_343X),
  99         CLK(NULL,       "omap_12m_fck", &omap_12m_fck,  CK_343X),
 100         CLK(NULL,       "dpll4_m2_ck",  &dpll4_m2_ck,   CK_343X),
 101         CLK(NULL,       "dpll4_m2x2_ck", &dpll4_m2x2_ck, CK_343X),
 102         CLK(NULL,       "dpll4_m3_ck",  &dpll4_m3_ck,   CK_343X),
 103         CLK(NULL,       "dpll4_m3x2_ck", &dpll4_m3x2_ck, CK_343X),
 104         CLK(NULL,       "dpll4_m4_ck",  &dpll4_m4_ck,   CK_343X),
 105         CLK(NULL,       "dpll4_m4x2_ck", &dpll4_m4x2_ck, CK_343X),
 106         CLK(NULL,       "dpll4_m5_ck",  &dpll4_m5_ck,   CK_343X),
 107         CLK(NULL,       "dpll4_m5x2_ck", &dpll4_m5x2_ck, CK_343X),
 108         CLK(NULL,       "dpll4_m6_ck",  &dpll4_m6_ck,   CK_343X),
 109         CLK(NULL,       "dpll4_m6x2_ck", &dpll4_m6x2_ck, CK_343X),
 110         CLK(NULL,       "emu_per_alwon_ck", &emu_per_alwon_ck, CK_343X),
 111         CLK(NULL,       "dpll5_ck",     &dpll5_ck,      CK_3430ES2),
 112         CLK(NULL,       "dpll5_m2_ck",  &dpll5_m2_ck,   CK_3430ES2),
 113         CLK(NULL,       "omap_120m_fck", &omap_120m_fck, CK_3430ES2),
 114         CLK(NULL,       "clkout2_src_ck", &clkout2_src_ck, CK_343X),
 115         CLK(NULL,       "sys_clkout2",  &sys_clkout2,   CK_343X),
 116         CLK(NULL,       "corex2_fck",   &corex2_fck,    CK_343X),
 117         CLK(NULL,       "dpll1_fck",    &dpll1_fck,     CK_343X),
 118         CLK(NULL,       "mpu_ck",       &mpu_ck,        CK_343X),
 119         CLK(NULL,       "arm_fck",      &arm_fck,       CK_343X),
 120         CLK(NULL,       "emu_mpu_alwon_ck", &emu_mpu_alwon_ck, CK_343X),
 121         CLK(NULL,       "dpll2_fck",    &dpll2_fck,     CK_343X),
 122         CLK(NULL,       "iva2_ck",      &iva2_ck,       CK_343X),
 123         CLK(NULL,       "l3_ick",       &l3_ick,        CK_343X),
 124         CLK(NULL,       "l4_ick",       &l4_ick,        CK_343X),
 125         CLK(NULL,       "rm_ick",       &rm_ick,        CK_343X),
 126         CLK(NULL,       "gfx_l3_ck",    &gfx_l3_ck,     CK_3430ES1),
 127         CLK(NULL,       "gfx_l3_fck",   &gfx_l3_fck,    CK_3430ES1),
 128         CLK(NULL,       "gfx_l3_ick",   &gfx_l3_ick,    CK_3430ES1),
 129         CLK(NULL,       "gfx_cg1_ck",   &gfx_cg1_ck,    CK_3430ES1),
 130         CLK(NULL,       "gfx_cg2_ck",   &gfx_cg2_ck,    CK_3430ES1),
 131         CLK(NULL,       "sgx_fck",      &sgx_fck,       CK_3430ES2),
 132         CLK(NULL,       "sgx_ick",      &sgx_ick,       CK_3430ES2),
 133         CLK(NULL,       "d2d_26m_fck",  &d2d_26m_fck,   CK_3430ES1),
 134         CLK(NULL,       "gpt10_fck",    &gpt10_fck,     CK_343X),
 135         CLK(NULL,       "gpt11_fck",    &gpt11_fck,     CK_343X),
 136         CLK(NULL,       "cpefuse_fck",  &cpefuse_fck,   CK_3430ES2),
 137         CLK(NULL,       "ts_fck",       &ts_fck,        CK_3430ES2),
 138         CLK(NULL,       "usbtll_fck",   &usbtll_fck,    CK_3430ES2),
 139         CLK(NULL,       "core_96m_fck", &core_96m_fck,  CK_343X),
 140         CLK("mmci-omap-hs.2",   "mmchs_fck",    &mmchs3_fck,    CK_3430ES2),
 141         CLK("mmci-omap-hs.1",   "mmchs_fck",    &mmchs2_fck,    CK_343X),
 142         CLK(NULL,       "mspro_fck",    &mspro_fck,     CK_343X),
 143         CLK("mmci-omap-hs.0",   "mmchs_fck",    &mmchs1_fck,    CK_343X),
 144         CLK("i2c_omap.3", "i2c_fck",    &i2c3_fck,      CK_343X),
 145         CLK("i2c_omap.2", "i2c_fck",    &i2c2_fck,      CK_343X),
 146         CLK("i2c_omap.1", "i2c_fck",    &i2c1_fck,      CK_343X),
 147         CLK("omap-mcbsp.5", "fck",      &mcbsp5_fck,    CK_343X),
 148         CLK("omap-mcbsp.1", "fck",      &mcbsp1_fck,    CK_343X),
 149         CLK(NULL,       "core_48m_fck", &core_48m_fck,  CK_343X),
 150         CLK("omap2_mcspi.4", "fck",     &mcspi4_fck,    CK_343X),
 151         CLK("omap2_mcspi.3", "fck",     &mcspi3_fck,    CK_343X),
 152         CLK("omap2_mcspi.2", "fck",     &mcspi2_fck,    CK_343X),
 153         CLK("omap2_mcspi.1", "fck",     &mcspi1_fck,    CK_343X),
 154         CLK(NULL,       "uart2_fck",    &uart2_fck,     CK_343X),
 155         CLK(NULL,       "uart1_fck",    &uart1_fck,     CK_343X),
 156         CLK(NULL,       "fshostusb_fck", &fshostusb_fck, CK_3430ES1),
 157         CLK(NULL,       "core_12m_fck", &core_12m_fck,  CK_343X),
 158         CLK(NULL,       "hdq_fck",      &hdq_fck,       CK_343X),
 159         CLK(NULL,       "ssi_ssr_fck",  &ssi_ssr_fck,   CK_343X),
 160         CLK(NULL,       "ssi_sst_fck",  &ssi_sst_fck,   CK_343X),
 161         CLK(NULL,       "core_l3_ick",  &core_l3_ick,   CK_343X),
 162         CLK(NULL,       "hsotgusb_ick", &hsotgusb_ick,  CK_343X),
 163         CLK(NULL,       "sdrc_ick",     &sdrc_ick,      CK_343X),
 164         CLK(NULL,       "gpmc_fck",     &gpmc_fck,      CK_343X),
 165         CLK(NULL,       "security_l3_ick", &security_l3_ick, CK_343X),
 166         CLK(NULL,       "pka_ick",      &pka_ick,       CK_343X),
 167         CLK(NULL,       "core_l4_ick",  &core_l4_ick,   CK_343X),
 168         CLK(NULL,       "usbtll_ick",   &usbtll_ick,    CK_3430ES2),
 169         CLK("mmci-omap-hs.2",   "mmchs_ick",    &mmchs3_ick,    CK_3430ES2),
 170         CLK(NULL,       "icr_ick",      &icr_ick,       CK_343X),
 171         CLK(NULL,       "aes2_ick",     &aes2_ick,      CK_343X),
 172         CLK(NULL,       "sha12_ick",    &sha12_ick,     CK_343X),
 173         CLK(NULL,       "des2_ick",     &des2_ick,      CK_343X),
 174         CLK("mmci-omap-hs.1",   "mmchs_ick",    &mmchs2_ick,    CK_343X),
 175         CLK("mmci-omap-hs.0",   "mmchs_ick",    &mmchs1_ick,    CK_343X),
 176         CLK(NULL,       "mspro_ick",    &mspro_ick,     CK_343X),
 177         CLK(NULL,       "hdq_ick",      &hdq_ick,       CK_343X),
 178         CLK("omap2_mcspi.4", "ick",     &mcspi4_ick,    CK_343X),
 179         CLK("omap2_mcspi.3", "ick",     &mcspi3_ick,    CK_343X),
 180         CLK("omap2_mcspi.2", "ick",     &mcspi2_ick,    CK_343X),
 181         CLK("omap2_mcspi.1", "ick",     &mcspi1_ick,    CK_343X),
 182         CLK("i2c_omap.3", "i2c_ick",    &i2c3_ick,      CK_343X),
 183         CLK("i2c_omap.2", "i2c_ick",    &i2c2_ick,      CK_343X),
 184         CLK("i2c_omap.1", "i2c_ick",    &i2c1_ick,      CK_343X),
 185         CLK(NULL,       "uart2_ick",    &uart2_ick,     CK_343X),
 186         CLK(NULL,       "uart1_ick",    &uart1_ick,     CK_343X),
 187         CLK(NULL,       "gpt11_ick",    &gpt11_ick,     CK_343X),
 188         CLK(NULL,       "gpt10_ick",    &gpt10_ick,     CK_343X),
 189         CLK("omap-mcbsp.5", "ick",      &mcbsp5_ick,    CK_343X),
 190         CLK("omap-mcbsp.1", "ick",      &mcbsp1_ick,    CK_343X),
 191         CLK(NULL,       "fac_ick",      &fac_ick,       CK_3430ES1),
 192         CLK(NULL,       "mailboxes_ick", &mailboxes_ick, CK_343X),
 193         CLK(NULL,       "omapctrl_ick", &omapctrl_ick,  CK_343X),
 194         CLK(NULL,       "ssi_l4_ick",   &ssi_l4_ick,    CK_343X),
 195         CLK(NULL,       "ssi_ick",      &ssi_ick,       CK_343X),
 196         CLK(NULL,       "usb_l4_ick",   &usb_l4_ick,    CK_3430ES1),
 197         CLK(NULL,       "security_l4_ick2", &security_l4_ick2, CK_343X),
 198         CLK(NULL,       "aes1_ick",     &aes1_ick,      CK_343X),
 199         CLK(NULL,       "rng_ick",      &rng_ick,       CK_343X),
 200         CLK(NULL,       "sha11_ick",    &sha11_ick,     CK_343X),
 201         CLK(NULL,       "des1_ick",     &des1_ick,      CK_343X),
 202         CLK(NULL,       "dss1_alwon_fck", &dss1_alwon_fck, CK_343X),
 203         CLK(NULL,       "dss_tv_fck",   &dss_tv_fck,    CK_343X),
 204         CLK(NULL,       "dss_96m_fck",  &dss_96m_fck,   CK_343X),
 205         CLK(NULL,       "dss2_alwon_fck", &dss2_alwon_fck, CK_343X),
 206         CLK(NULL,       "dss_ick",      &dss_ick,       CK_343X),
 207         CLK(NULL,       "cam_mclk",     &cam_mclk,      CK_343X),
 208         CLK(NULL,       "cam_ick",      &cam_ick,       CK_343X),
 209         CLK(NULL,       "usbhost_120m_fck", &usbhost_120m_fck, CK_3430ES2),
 210         CLK(NULL,       "usbhost_48m_fck", &usbhost_48m_fck, CK_3430ES2),
 211         CLK(NULL,       "usbhost_ick",  &usbhost_ick,   CK_3430ES2),
 212         CLK(NULL,       "usbhost_sar_fck", &usbhost_sar_fck, CK_3430ES2),
 213         CLK(NULL,       "usim_fck",     &usim_fck,      CK_3430ES2),
 214         CLK(NULL,       "gpt1_fck",     &gpt1_fck,      CK_343X),
 215         CLK(NULL,       "wkup_32k_fck", &wkup_32k_fck,  CK_343X),
 216         CLK(NULL,       "gpio1_dbck",   &gpio1_dbck,    CK_343X),
 217         CLK("omap_wdt", "fck",          &wdt2_fck,      CK_343X),
 218         CLK(NULL,       "wkup_l4_ick",  &wkup_l4_ick,   CK_343X),
 219         CLK(NULL,       "usim_ick",     &usim_ick,      CK_3430ES2),
 220         CLK("omap_wdt", "ick",          &wdt2_ick,      CK_343X),
 221         CLK(NULL,       "wdt1_ick",     &wdt1_ick,      CK_343X),
 222         CLK(NULL,       "gpio1_ick",    &gpio1_ick,     CK_343X),
 223         CLK(NULL,       "omap_32ksync_ick", &omap_32ksync_ick, CK_343X),
 224         CLK(NULL,       "gpt12_ick",    &gpt12_ick,     CK_343X),
 225         CLK(NULL,       "gpt1_ick",     &gpt1_ick,      CK_343X),
 226         CLK(NULL,       "per_96m_fck",  &per_96m_fck,   CK_343X),
 227         CLK(NULL,       "per_48m_fck",  &per_48m_fck,   CK_343X),
 228         CLK(NULL,       "uart3_fck",    &uart3_fck,     CK_343X),
 229         CLK(NULL,       "gpt2_fck",     &gpt2_fck,      CK_343X),
 230         CLK(NULL,       "gpt3_fck",     &gpt3_fck,      CK_343X),
 231         CLK(NULL,       "gpt4_fck",     &gpt4_fck,      CK_343X),
 232         CLK(NULL,       "gpt5_fck",     &gpt5_fck,      CK_343X),
 233         CLK(NULL,       "gpt6_fck",     &gpt6_fck,      CK_343X),
 234         CLK(NULL,       "gpt7_fck",     &gpt7_fck,      CK_343X),
 235         CLK(NULL,       "gpt8_fck",     &gpt8_fck,      CK_343X),
 236         CLK(NULL,       "gpt9_fck",     &gpt9_fck,      CK_343X),
 237         CLK(NULL,       "per_32k_alwon_fck", &per_32k_alwon_fck, CK_343X),
 238         CLK(NULL,       "gpio6_dbck",   &gpio6_dbck,    CK_343X),
 239         CLK(NULL,       "gpio5_dbck",   &gpio5_dbck,    CK_343X),
 240         CLK(NULL,       "gpio4_dbck",   &gpio4_dbck,    CK_343X),
 241         CLK(NULL,       "gpio3_dbck",   &gpio3_dbck,    CK_343X),
 242         CLK(NULL,       "gpio2_dbck",   &gpio2_dbck,    CK_343X),
 243         CLK(NULL,       "wdt3_fck",     &wdt3_fck,      CK_343X),
 244         CLK(NULL,       "per_l4_ick",   &per_l4_ick,    CK_343X),
 245         CLK(NULL,       "gpio6_ick",    &gpio6_ick,     CK_343X),
 246         CLK(NULL,       "gpio5_ick",    &gpio5_ick,     CK_343X),
 247         CLK(NULL,       "gpio4_ick",    &gpio4_ick,     CK_343X),
 248         CLK(NULL,       "gpio3_ick",    &gpio3_ick,     CK_343X),
 249         CLK(NULL,       "gpio2_ick",    &gpio2_ick,     CK_343X),
 250         CLK(NULL,       "wdt3_ick",     &wdt3_ick,      CK_343X),
 251         CLK(NULL,       "uart3_ick",    &uart3_ick,     CK_343X),
 252         CLK(NULL,       "gpt9_ick",     &gpt9_ick,      CK_343X),
 253         CLK(NULL,       "gpt8_ick",     &gpt8_ick,      CK_343X),
 254         CLK(NULL,       "gpt7_ick",     &gpt7_ick,      CK_343X),
 255         CLK(NULL,       "gpt6_ick",     &gpt6_ick,      CK_343X),
 256         CLK(NULL,       "gpt5_ick",     &gpt5_ick,      CK_343X),
 257         CLK(NULL,       "gpt4_ick",     &gpt4_ick,      CK_343X),
 258         CLK(NULL,       "gpt3_ick",     &gpt3_ick,      CK_343X),
 259         CLK(NULL,       "gpt2_ick",     &gpt2_ick,      CK_343X),
 260         CLK("omap-mcbsp.2", "ick",      &mcbsp2_ick,    CK_343X),
 261         CLK("omap-mcbsp.3", "ick",      &mcbsp3_ick,    CK_343X),
 262         CLK("omap-mcbsp.4", "ick",      &mcbsp4_ick,    CK_343X),
 263         CLK("omap-mcbsp.2", "fck",      &mcbsp2_fck,    CK_343X),
 264         CLK("omap-mcbsp.3", "fck",      &mcbsp3_fck,    CK_343X),
 265         CLK("omap-mcbsp.4", "fck",      &mcbsp4_fck,    CK_343X),
 266         CLK(NULL,       "emu_src_ck",   &emu_src_ck,    CK_343X),
 267         CLK(NULL,       "pclk_fck",     &pclk_fck,      CK_343X),
 268         CLK(NULL,       "pclkx2_fck",   &pclkx2_fck,    CK_343X),
 269         CLK(NULL,       "atclk_fck",    &atclk_fck,     CK_343X),
 270         CLK(NULL,       "traceclk_src_fck", &traceclk_src_fck, CK_343X),
 271         CLK(NULL,       "traceclk_fck", &traceclk_fck,  CK_343X),
 272         CLK(NULL,       "sr1_fck",      &sr1_fck,       CK_343X),
 273         CLK(NULL,       "sr2_fck",      &sr2_fck,       CK_343X),
 274         CLK(NULL,       "sr_l4_ick",    &sr_l4_ick,     CK_343X),
 275         CLK(NULL,       "secure_32k_fck", &secure_32k_fck, CK_343X),
 276         CLK(NULL,       "gpt12_fck",    &gpt12_fck,     CK_343X),
 277         CLK(NULL,       "wdt1_fck",     &wdt1_fck,      CK_343X),
 278 };
 279
 280 /* CM_AUTOIDLE_PLL*.AUTO_* bit values */
 281 #define DPLL_AUTOIDLE_DISABLE                   0x0
 282 #define DPLL_AUTOIDLE_LOW_POWER_STOP            0x1
 283
 284 #define MAX_DPLL_WAIT_TRIES             1000000
 285
 286 /**
 287  * omap3_dpll_recalc - recalculate DPLL rate
 288  * @clk: DPLL struct clk
 289  *
 290  * Recalculate and propagate the DPLL rate.
 291  */
 292 static void omap3_dpll_recalc(struct clk *clk)
 293 {
 294         clk->rate = omap2_get_dpll_rate(clk);
 295 }
 296
 297 /* _omap3_dpll_write_clken - write clken_bits arg to a DPLL's enable bits */
 298 static void _omap3_dpll_write_clken(struct clk *clk, u8 clken_bits)
 299 {
 300         const struct dpll_data *dd;
 301         u32 v;
 302
 303         dd = clk->dpll_data;
 304
 305         v = __raw_readl(dd->control_reg);
 306         v &= ~dd->enable_mask;
 307         v |= clken_bits << __ffs(dd->enable_mask);
 308         __raw_writel(v, dd->control_reg);
 309 }
 310
 311 /* _omap3_wait_dpll_status: wait for a DPLL to enter a specific state */
 312 static int _omap3_wait_dpll_status(struct clk *clk, u8 state)
 313 {
 314         const struct dpll_data *dd;
 315         int i = 0;
 316         int ret = -EINVAL;
 317         u32 idlest_mask;
 318
 319         dd = clk->dpll_data;
 320
 321         state <<= dd->idlest_bit;
 322         idlest_mask = 1 << dd->idlest_bit;
 323
 324         while (((__raw_readl(dd->idlest_reg) & idlest_mask) != state) &&
 325                i < MAX_DPLL_WAIT_TRIES) {
 326                 i++;
 327                 udelay(1);
 328         }
 329
 330         if (i == MAX_DPLL_WAIT_TRIES) {
 331                 printk(KERN_ERR "clock: %s failed transition to '%s'\n",
 332                        clk->name, (state) ? "locked" : "bypassed");
 333         } else {
 334                 pr_debug("clock: %s transition to '%s' in %d loops\n",
 335                          clk->name, (state) ? "locked" : "bypassed", i);
 336
 337                 ret = 0;
 338         }
 339
 340         return ret;
 341 }
 342
 343 /* Non-CORE DPLL (e.g., DPLLs that do not control SDRC) clock functions */
 344
 345 /*
 346  * _omap3_noncore_dpll_lock - instruct a DPLL to lock and wait for readiness
 347  * @clk: pointer to a DPLL struct clk
 348  *
 349  * Instructs a non-CORE DPLL to lock.  Waits for the DPLL to report
 350  * readiness before returning.  Will save and restore the DPLL's
 351  * autoidle state across the enable, per the CDP code.  If the DPLL
 352  * locked successfully, return 0; if the DPLL did not lock in the time
 353  * allotted, or DPLL3 was passed in, return -EINVAL.
 354  */
 355 static int _omap3_noncore_dpll_lock(struct clk *clk)
 356 {
 357         u8 ai;
 358         int r;
 359
 360         if (clk == &dpll3_ck)
 361                 return -EINVAL;
 362
 363         pr_debug("clock: locking DPLL %s\n", clk->name);
 364
 365         ai = omap3_dpll_autoidle_read(clk);
 366
 367         _omap3_dpll_write_clken(clk, DPLL_LOCKED);
 368
 369         if (ai) {
 370                 /*
 371                  * If no downstream clocks are enabled, CM_IDLEST bit
 372                  * may never become active, so don't wait for DPLL to lock.
 373                  */
 374                 r = 0;
 375                 omap3_dpll_allow_idle(clk);
 376         } else {
 377                 r = _omap3_wait_dpll_status(clk, 1);
 378                 omap3_dpll_deny_idle(clk);
 379         };
 380
 381         return r;
 382 }
 383
 384 /*
 385  * omap3_noncore_dpll_bypass - instruct a DPLL to bypass and wait for readiness
 386  * @clk: pointer to a DPLL struct clk
 387  *
 388  * Instructs a non-CORE DPLL to enter low-power bypass mode.  In
 389  * bypass mode, the DPLL's rate is set equal to its parent clock's
 390  * rate.  Waits for the DPLL to report readiness before returning.
 391  * Will save and restore the DPLL's autoidle state across the enable,
 392  * per the CDP code.  If the DPLL entered bypass mode successfully,
 393  * return 0; if the DPLL did not enter bypass in the time allotted, or
 394  * DPLL3 was passed in, or the DPLL does not support low-power bypass,
 395  * return -EINVAL.
 396  */
 397 static int _omap3_noncore_dpll_bypass(struct clk *clk)
 398 {
 399         int r;
 400         u8 ai;
 401
 402         if (clk == &dpll3_ck)
 403                 return -EINVAL;
 404
 405         if (!(clk->dpll_data->modes & (1 << DPLL_LOW_POWER_BYPASS)))
 406                 return -EINVAL;
 407
 408         pr_debug("clock: configuring DPLL %s for low-power bypass\n",
 409                  clk->name);
 410
 411         ai = omap3_dpll_autoidle_read(clk);
 412
 413         _omap3_dpll_write_clken(clk, DPLL_LOW_POWER_BYPASS);
 414
 415         r = _omap3_wait_dpll_status(clk, 0);
 416
 417         if (ai)
 418                 omap3_dpll_allow_idle(clk);
 419         else
 420                 omap3_dpll_deny_idle(clk);
 421
 422         return r;
 423 }
 424
 425 /*
 426  * _omap3_noncore_dpll_stop - instruct a DPLL to stop
 427  * @clk: pointer to a DPLL struct clk
 428  *
 429  * Instructs a non-CORE DPLL to enter low-power stop. Will save and
 430  * restore the DPLL's autoidle state across the stop, per the CDP
 431  * code.  If DPLL3 was passed in, or the DPLL does not support
 432  * low-power stop, return -EINVAL; otherwise, return 0.
 433  */
 434 static int _omap3_noncore_dpll_stop(struct clk *clk)
 435 {
 436         u8 ai;
 437
 438         if (clk == &dpll3_ck)
 439                 return -EINVAL;
 440
 441         if (!(clk->dpll_data->modes & (1 << DPLL_LOW_POWER_STOP)))
 442                 return -EINVAL;
 443
 444         pr_debug("clock: stopping DPLL %s\n", clk->name);
 445
 446         ai = omap3_dpll_autoidle_read(clk);
 447
 448         _omap3_dpll_write_clken(clk, DPLL_LOW_POWER_STOP);
 449
 450         if (ai)
 451                 omap3_dpll_allow_idle(clk);
 452         else
 453                 omap3_dpll_deny_idle(clk);
 454
 455         return 0;
 456 }
 457
 458 /**
 459  * omap3_noncore_dpll_enable - instruct a DPLL to enter bypass or lock mode
 460  * @clk: pointer to a DPLL struct clk
 461  *
 462  * Instructs a non-CORE DPLL to enable, e.g., to enter bypass or lock.
 463  * The choice of modes depends on the DPLL's programmed rate: if it is
 464  * the same as the DPLL's parent clock, it will enter bypass;
 465  * otherwise, it will enter lock.  This code will wait for the DPLL to
 466  * indicate readiness before returning, unless the DPLL takes too long
 467  * to enter the target state.  Intended to be used as the struct clk's
 468  * enable function.  If DPLL3 was passed in, or the DPLL does not
 469  * support low-power stop, or if the DPLL took too long to enter
 470  * bypass or lock, return -EINVAL; otherwise, return 0.
 471  */
 472 static int omap3_noncore_dpll_enable(struct clk *clk)
 473 {
 474         int r;
 475
 476         if (clk == &dpll3_ck)
 477                 return -EINVAL;
 478
 479         if (clk->parent->rate == clk_get_rate(clk))
 480                 r = _omap3_noncore_dpll_bypass(clk);
 481         else
 482                 r = _omap3_noncore_dpll_lock(clk);
 483
 484         return r;
 485 }
 486
 487 /**
 488  * omap3_noncore_dpll_enable - instruct a DPLL to enter bypass or lock mode
 489  * @clk: pointer to a DPLL struct clk
 490  *
 491  * Instructs a non-CORE DPLL to enable, e.g., to enter bypass or lock.
 492  * The choice of modes depends on the DPLL's programmed rate: if it is
 493  * the same as the DPLL's parent clock, it will enter bypass;
 494  * otherwise, it will enter lock.  This code will wait for the DPLL to
 495  * indicate readiness before returning, unless the DPLL takes too long
 496  * to enter the target state.  Intended to be used as the struct clk's
 497  * enable function.  If DPLL3 was passed in, or the DPLL does not
 498  * support low-power stop, or if the DPLL took too long to enter
 499  * bypass or lock, return -EINVAL; otherwise, return 0.
 500  */
 501 static void omap3_noncore_dpll_disable(struct clk *clk)
 502 {
 503         if (clk == &dpll3_ck)
 504                 return;
 505
 506         _omap3_noncore_dpll_stop(clk);
 507 }
 508
 509 static const struct clkops clkops_noncore_dpll_ops = {
 510         .enable         = &omap3_noncore_dpll_enable,
 511         .disable        = &omap3_noncore_dpll_disable,
 512 };
 513
 514 /**
 515  * omap3_dpll_autoidle_read - read a DPLL's autoidle bits
 516  * @clk: struct clk * of the DPLL to read
 517  *
 518  * Return the DPLL's autoidle bits, shifted down to bit 0.  Returns
 519  * -EINVAL if passed a null pointer or if the struct clk does not
 520  * appear to refer to a DPLL.
 521  */
 522 static u32 omap3_dpll_autoidle_read(struct clk *clk)
 523 {
 524         const struct dpll_data *dd;
 525         u32 v;
 526
 527         if (!clk || !clk->dpll_data)
 528                 return -EINVAL;
 529
 530         dd = clk->dpll_data;
 531
 532         v = __raw_readl(dd->autoidle_reg);
 533         v &= dd->autoidle_mask;
 534         v >>= __ffs(dd->autoidle_mask);
 535
 536         return v;
 537 }
 538
 539 /**
 540  * omap3_dpll_allow_idle - enable DPLL autoidle bits
 541  * @clk: struct clk * of the DPLL to operate on
 542  *
 543  * Enable DPLL automatic idle control.  This automatic idle mode
 544  * switching takes effect only when the DPLL is locked, at least on
 545  * OMAP3430.  The DPLL will enter low-power stop when its downstream
 546  * clocks are gated.  No return value.
 547  */
 548 static void omap3_dpll_allow_idle(struct clk *clk)
 549 {
 550         const struct dpll_data *dd;
 551         u32 v;
 552
 553         if (!clk || !clk->dpll_data)
 554                 return;
 555
 556         dd = clk->dpll_data;
 557
 558         /*
 559          * REVISIT: CORE DPLL can optionally enter low-power bypass
 560          * by writing 0x5 instead of 0x1.  Add some mechanism to
 561          * optionally enter this mode.
 562          */
 563         v = __raw_readl(dd->autoidle_reg);
 564         v &= ~dd->autoidle_mask;
 565         v |= DPLL_AUTOIDLE_LOW_POWER_STOP << __ffs(dd->autoidle_mask);
 566         __raw_writel(v, dd->autoidle_reg);
 567 }
 568
 569 /**
 570  * omap3_dpll_deny_idle - prevent DPLL from automatically idling
 571  * @clk: struct clk * of the DPLL to operate on
 572  *
 573  * Disable DPLL automatic idle control.  No return value.
 574  */
 575 static void omap3_dpll_deny_idle(struct clk *clk)
 576 {
 577         const struct dpll_data *dd;
 578         u32 v;
 579
 580         if (!clk || !clk->dpll_data)
 581                 return;
 582
 583         dd = clk->dpll_data;
 584
 585         v = __raw_readl(dd->autoidle_reg);
 586         v &= ~dd->autoidle_mask;
 587         v |= DPLL_AUTOIDLE_DISABLE << __ffs(dd->autoidle_mask);
 588         __raw_writel(v, dd->autoidle_reg);
 589 }
 590
 591 /* Clock control for DPLL outputs */
 592
 593 /**
 594  * omap3_clkoutx2_recalc - recalculate DPLL X2 output virtual clock rate
 595  * @clk: DPLL output struct clk
 596  *
 597  * Using parent clock DPLL data, look up DPLL state.  If locked, set our
 598  * rate to the dpll_clk * 2; otherwise, just use dpll_clk.
 599  */
 600 static void omap3_clkoutx2_recalc(struct clk *clk)
 601 {
 602         const struct dpll_data *dd;
 603         u32 v;
 604         struct clk *pclk;
 605
 606         /* Walk up the parents of clk, looking for a DPLL */
 607         pclk = clk->parent;
 608         while (pclk && !pclk->dpll_data)
 609                 pclk = pclk->parent;
 610
 611         /* clk does not have a DPLL as a parent? */
 612         WARN_ON(!pclk);
 613
 614         dd = pclk->dpll_data;
 615
 616         WARN_ON(!dd->control_reg || !dd->enable_mask);
 617
 618         v = __raw_readl(dd->control_reg) & dd->enable_mask;
 619         v >>= __ffs(dd->enable_mask);
 620         if (v != DPLL_LOCKED)
 621                 clk->rate = clk->parent->rate;
 622         else
 623                 clk->rate = clk->parent->rate * 2;
 624 }
 625
 626 /* Common clock code */
 627
 628 /*
 629  * As it is structured now, this will prevent an OMAP2/3 multiboot
 630  * kernel from compiling.  This will need further attention.
 631  */
 632 #if defined(CONFIG_ARCH_OMAP3)
 633
 634 static struct clk_functions omap2_clk_functions = {
 635         .clk_enable             = omap2_clk_enable,
 636         .clk_disable            = omap2_clk_disable,
 637         .clk_round_rate         = omap2_clk_round_rate,
 638         .clk_set_rate           = omap2_clk_set_rate,
 639         .clk_set_parent         = omap2_clk_set_parent,
 640         .clk_disable_unused     = omap2_clk_disable_unused,
 641 };
 642
 643 /*
 644  * Set clocks for bypass mode for reboot to work.
 645  */
 646 void omap2_clk_prepare_for_reboot(void)
 647 {
 648         /* REVISIT: Not ready for 343x */
 649 #if 0
 650         u32 rate;
 651
 652         if (vclk == NULL || sclk == NULL)
 653                 return;
 654
 655         rate = clk_get_rate(sclk);
 656         clk_set_rate(vclk, rate);
 657 #endif
 658 }
 659
 660 /* REVISIT: Move this init stuff out into clock.c */
 661
 662 /*
 663  * Switch the MPU rate if specified on cmdline.
 664  * We cannot do this early until cmdline is parsed.
 665  */
 666 static int __init omap2_clk_arch_init(void)
 667 {
 668         if (!mpurate)
 669                 return -EINVAL;
 670
 671         /* REVISIT: not yet ready for 343x */
 672 #if 0
 673         if (omap2_select_table_rate(&virt_prcm_set, mpurate))
 674                 printk(KERN_ERR "Could not find matching MPU rate\n");
 675 #endif
 676
 677         recalculate_root_clocks();
 678
 679         printk(KERN_INFO "Switched to new clocking rate (Crystal/DPLL3/MPU): "
 680                "%ld.%01ld/%ld/%ld MHz\n",
 681                (osc_sys_ck.rate / 1000000), (osc_sys_ck.rate / 100000) % 10,
 682                (core_ck.rate / 1000000), (dpll1_fck.rate / 1000000)) ;
 683
 684         return 0;
 685 }
 686 arch_initcall(omap2_clk_arch_init);
 687
 688 int __init omap2_clk_init(void)
 689 {
 690         /* struct prcm_config *prcm; */
 691         struct omap_clk *c;
 692         /* u32 clkrate; */
 693         u32 cpu_clkflg;
 694
 695         if (cpu_is_omap34xx()) {
 696                 cpu_mask = RATE_IN_343X;
 697                 cpu_clkflg = CK_343X;
 698
 699                 /*
 700                  * Update this if there are further clock changes between ES2
 701                  * and production parts
 702                  */
 703                 if (omap_rev() == OMAP3430_REV_ES1_0) {
 704                         /* No 3430ES1-only rates exist, so no RATE_IN_3430ES1 */
 705                         cpu_clkflg |= CK_3430ES1;
 706                 } else {
 707                         cpu_mask |= RATE_IN_3430ES2;
 708                         cpu_clkflg |= CK_3430ES2;
 709                 }
 710         }
 711
 712         clk_init(&omap2_clk_functions);
 713
 714         for (c = omap34xx_clks; c < omap34xx_clks + ARRAY_SIZE(omap34xx_clks); c++)
 715                 if (c->cpu & cpu_clkflg) {
 716                         clkdev_add(&c->lk);
 717                         clk_register(c->lk.clk);
 718                         omap2_init_clk_clkdm(c->lk.clk);
 719                 }
 720
 721         /* REVISIT: Not yet ready for OMAP3 */
 722 #if 0
 723         /* Check the MPU rate set by bootloader */
 724         clkrate = omap2_get_dpll_rate_24xx(&dpll_ck);
 725         for (prcm = rate_table; prcm->mpu_speed; prcm++) {
 726                 if (!(prcm->flags & cpu_mask))
 727                         continue;
 728                 if (prcm->xtal_speed != sys_ck.rate)
 729                         continue;
 730                 if (prcm->dpll_speed <= clkrate)
 731                          break;
 732         }
 733         curr_prcm_set = prcm;
 734 #endif
 735
 736         recalculate_root_clocks();
 737
 738         printk(KERN_INFO "Clocking rate (Crystal/DPLL/ARM core): "
 739                "%ld.%01ld/%ld/%ld MHz\n",
 740                (osc_sys_ck.rate / 1000000), (osc_sys_ck.rate / 100000) % 10,
 741                (core_ck.rate / 1000000), (arm_fck.rate / 1000000));
 742
 743         /*
 744          * Only enable those clocks we will need, let the drivers
 745          * enable other clocks as necessary
 746          */
 747         clk_enable_init_clocks();
 748
 749         /* Avoid sleeping during omap2_clk_prepare_for_reboot() */
 750         /* REVISIT: not yet ready for 343x */
 751 #if 0
 752         vclk = clk_get(NULL, "virt_prcm_set");
 753         sclk = clk_get(NULL, "sys_ck");
 754 #endif
 755         return 0;
 756 }
 757
 758 #endif