arch/arm/mach-s3c24xx/clock-s3c2416.c

   1 /* linux/arch/arm/mach-s3c2416/clock.c
   2  *
   3  * Copyright (c) 2010 Simtec Electronics
   4  * Copyright (c) 2010 Ben Dooks <ben-linux@fluff.org>
   5  *
   6  * S3C2416 Clock control support
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  */
  13
  14 #include <linux/init.h>
  15 #include <linux/clk.h>
  16
  17 #include <plat/clock.h>
  18 #include <plat/clock-clksrc.h>
  19 #include <plat/cpu.h>
  20
  21 #include <plat/cpu-freq.h>
  22 #include <plat/pll.h>
  23
  24 #include <asm/mach/map.h>
  25
  26 #include <mach/regs-clock.h>
  27 #include <mach/regs-s3c2443-clock.h>
  28
  29 /* armdiv
  30  *
  31  * this clock is sourced from msysclk and can have a number of
  32  * divider values applied to it to then be fed into armclk.
  33  * The real clock definition is done in s3c2443-clock.c,
  34  * only the armdiv divisor table must be defined here.
  35 */
  36
  37 static unsigned int armdiv[8] = {
  38         [0] = 1,
  39         [1] = 2,
  40         [2] = 3,
  41         [3] = 4,
  42         [5] = 6,
  43         [7] = 8,
  44 };
  45
  46 static struct clksrc_clk hsspi_eplldiv = {
  47         .clk = {
  48                 .name   = "hsspi-eplldiv",
  49                 .parent = &clk_esysclk.clk,
  50                 .ctrlbit = (1 << 14),
  51                 .enable = s3c2443_clkcon_enable_s,
  52         },
  53         .reg_div = { .reg = S3C2443_CLKDIV1, .size = 2, .shift = 24 },
  54 };
  55
  56 static struct clk *hsspi_sources[] = {
  57         [0] = &hsspi_eplldiv.clk,
  58         [1] = NULL, /* to fix */
  59 };
  60
  61 static struct clksrc_clk hsspi_mux = {
  62         .clk    = {
  63                 .name   = "hsspi-if",
  64         },
  65         .sources = &(struct clksrc_sources) {
  66                 .sources = hsspi_sources,
  67                 .nr_sources = ARRAY_SIZE(hsspi_sources),
  68         },
  69         .reg_src = { .reg = S3C2443_CLKSRC, .size = 1, .shift = 18 },
  70 };
  71
  72 static struct clksrc_clk hsmmc_div[] = {
  73         [0] = {
  74                 .clk = {
  75                         .name   = "hsmmc-div",
  76                         .devname        = "s3c-sdhci.0",
  77                         .parent = &clk_esysclk.clk,
  78                 },
  79                 .reg_div = { .reg = S3C2416_CLKDIV2, .size = 2, .shift = 6 },
  80         },
  81         [1] = {
  82                 .clk = {
  83                         .name   = "hsmmc-div",
  84                         .devname        = "s3c-sdhci.1",
  85                         .parent = &clk_esysclk.clk,
  86                 },
  87                 .reg_div = { .reg = S3C2443_CLKDIV1, .size = 2, .shift = 6 },
  88         },
  89 };
  90
  91 static struct clksrc_clk hsmmc_mux0 = {
  92         .clk    = {
  93                 .name           = "hsmmc-if",
  94                 .devname        = "s3c-sdhci.0",
  95                 .ctrlbit        = (1 << 6),
  96                 .enable         = s3c2443_clkcon_enable_s,
  97         },
  98         .sources        = &(struct clksrc_sources) {
  99                 .nr_sources     = 2,
 100                 .sources        = (struct clk * []) {
 101                         [0]     = &hsmmc_div[0].clk,
 102                         [1]     = NULL, /* to fix */
 103                 },
 104         },
 105         .reg_src = { .reg = S3C2443_CLKSRC, .size = 1, .shift = 16 },
 106 };
 107
 108 static struct clksrc_clk hsmmc_mux1 = {
 109         .clk    = {
 110                 .name           = "hsmmc-if",
 111                 .devname        = "s3c-sdhci.1",
 112                 .ctrlbit        = (1 << 12),
 113                 .enable         = s3c2443_clkcon_enable_s,
 114         },
 115         .sources        = &(struct clksrc_sources) {
 116                 .nr_sources     = 2,
 117                 .sources        = (struct clk * []) {
 118                         [0]     = &hsmmc_div[1].clk,
 119                         [1]     = NULL, /* to fix */
 120                 },
 121         },
 122         .reg_src = { .reg = S3C2443_CLKSRC, .size = 1, .shift = 17 },
 123 };
 124
 125 static struct clk hsmmc0_clk = {
 126         .name           = "hsmmc",
 127         .devname        = "s3c-sdhci.0",
 128         .parent         = &clk_h,
 129         .enable         = s3c2443_clkcon_enable_h,
 130         .ctrlbit        = S3C2416_HCLKCON_HSMMC0,
 131 };
 132
 133 static struct clksrc_clk *clksrcs[] __initdata = {
 134         &hsspi_eplldiv,
 135         &hsspi_mux,
 136         &hsmmc_div[0],
 137         &hsmmc_div[1],
 138         &hsmmc_mux0,
 139         &hsmmc_mux1,
 140 };
 141
 142 static struct clk_lookup s3c2416_clk_lookup[] = {
 143         CLKDEV_INIT("s3c-sdhci.0", "mmc_busclk.0", &hsmmc0_clk),
 144         CLKDEV_INIT("s3c-sdhci.0", "mmc_busclk.2", &hsmmc_mux0.clk),
 145         CLKDEV_INIT("s3c-sdhci.1", "mmc_busclk.2", &hsmmc_mux1.clk),
 146         /* s3c2443-spi.0 is used on s3c2416 and s3c2450 as well */
 147         CLKDEV_INIT("s3c2443-spi.0", "spi_busclk2", &hsspi_mux.clk),
 148 };
 149
 150 void __init s3c2416_init_clocks(int xtal)
 151 {
 152         u32 epllcon = __raw_readl(S3C2443_EPLLCON);
 153         u32 epllcon1 = __raw_readl(S3C2443_EPLLCON+4);
 154         int ptr;
 155
 156         /* s3c2416 EPLL compatible with s3c64xx */
 157         clk_epll.rate = s3c_get_pll6553x(xtal, epllcon, epllcon1);
 158
 159         clk_epll.parent = &clk_epllref.clk;
 160
 161         s3c2443_common_init_clocks(xtal, s3c2416_get_pll,
 162                                    armdiv, ARRAY_SIZE(armdiv),
 163                                    S3C2416_CLKDIV0_ARMDIV_MASK);
 164
 165         for (ptr = 0; ptr < ARRAY_SIZE(clksrcs); ptr++)
 166                 s3c_register_clksrc(clksrcs[ptr], 1);
 167
 168         s3c24xx_register_clock(&hsmmc0_clk);
 169         clkdev_add_table(s3c2416_clk_lookup, ARRAY_SIZE(s3c2416_clk_lookup));
 170
 171 }