arch/arm/mach-shmobile/clock-r8a7779.c

   1 /*
   2  * r8a7779 clock framework support
   3  *
   4  * Copyright (C) 2011  Renesas Solutions Corp.
   5  * Copyright (C) 2011  Magnus Damm
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20 #include <linux/init.h>
  21 #include <linux/kernel.h>
  22 #include <linux/io.h>
  23 #include <linux/sh_clk.h>
  24 #include <linux/clkdev.h>
  25 #include <mach/common.h>
  26
  27 #define FRQMR   0xffc80014
  28 #define MSTPCR0 0xffc80030
  29 #define MSTPCR1 0xffc80034
  30 #define MSTPCR3 0xffc8003c
  31 #define MSTPSR1 0xffc80044
  32 #define MSTPSR4 0xffc80048
  33 #define MSTPSR6 0xffc8004c
  34 #define MSTPCR4 0xffc80050
  35 #define MSTPCR5 0xffc80054
  36 #define MSTPCR6 0xffc80058
  37 #define MSTPCR7 0xffc80040
  38
  39 /* ioremap() through clock mapping mandatory to avoid
  40  * collision with ARM coherent DMA virtual memory range.
  41  */
  42
  43 static struct clk_mapping cpg_mapping = {
  44         .phys   = 0xffc80000,
  45         .len    = 0x80,
  46 };
  47
  48 /*
  49  * Default rate for the root input clock, reset this with clk_set_rate()
  50  * from the platform code.
  51  */
  52 static struct clk plla_clk = {
  53         .rate           = 1500000000,
  54         .mapping        = &cpg_mapping,
  55 };
  56
  57 static struct clk *main_clks[] = {
  58         &plla_clk,
  59 };
  60
  61 static int divisors[] = { 0, 0, 0, 6, 8, 12, 16, 0, 24, 32, 36, 0, 0, 0, 0, 0 };
  62
  63 static struct clk_div_mult_table div4_div_mult_table = {
  64         .divisors = divisors,
  65         .nr_divisors = ARRAY_SIZE(divisors),
  66 };
  67
  68 static struct clk_div4_table div4_table = {
  69         .div_mult_table = &div4_div_mult_table,
  70 };
  71
  72 enum { DIV4_S, DIV4_OUT, DIV4_S4, DIV4_S3, DIV4_S1, DIV4_P, DIV4_NR };
  73
  74 static struct clk div4_clks[DIV4_NR] = {
  75         [DIV4_S]        = SH_CLK_DIV4(&plla_clk, FRQMR, 20,
  76                                       0x0018, CLK_ENABLE_ON_INIT),
  77         [DIV4_OUT]      = SH_CLK_DIV4(&plla_clk, FRQMR, 16,
  78                                       0x0700, CLK_ENABLE_ON_INIT),
  79         [DIV4_S4]       = SH_CLK_DIV4(&plla_clk, FRQMR, 12,
  80                                       0x0040, CLK_ENABLE_ON_INIT),
  81         [DIV4_S3]       = SH_CLK_DIV4(&plla_clk, FRQMR, 8,
  82                                       0x0010, CLK_ENABLE_ON_INIT),
  83         [DIV4_S1]       = SH_CLK_DIV4(&plla_clk, FRQMR, 4,
  84                                       0x0060, CLK_ENABLE_ON_INIT),
  85         [DIV4_P]        = SH_CLK_DIV4(&plla_clk, FRQMR, 0,
  86                                       0x0300, CLK_ENABLE_ON_INIT),
  87 };
  88
  89 enum { MSTP026, MSTP025, MSTP024, MSTP023, MSTP022, MSTP021,
  90         MSTP016, MSTP015, MSTP014,
  91         MSTP_NR };
  92
  93 static struct clk mstp_clks[MSTP_NR] = {
  94         [MSTP026] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 26, 0), /* SCIF0 */
  95         [MSTP025] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 25, 0), /* SCIF1 */
  96         [MSTP024] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 24, 0), /* SCIF2 */
  97         [MSTP023] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 23, 0), /* SCIF3 */
  98         [MSTP022] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 22, 0), /* SCIF4 */
  99         [MSTP021] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 21, 0), /* SCIF5 */
 100         [MSTP016] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 16, 0), /* TMU0 */
 101         [MSTP015] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 15, 0), /* TMU1 */
 102         [MSTP014] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 14, 0), /* TMU2 */
 103 };
 104
 105 static unsigned long mul4_recalc(struct clk *clk)
 106 {
 107         return clk->parent->rate * 4;
 108 }
 109
 110 static struct clk_ops mul4_clk_ops = {
 111         .recalc         = mul4_recalc,
 112 };
 113
 114 struct clk clkz_clk = {
 115         .ops            = &mul4_clk_ops,
 116         .parent         = &div4_clks[DIV4_S],
 117 };
 118
 119 struct clk clkzs_clk = {
 120         /* clks x 4 / 4 = clks */
 121         .parent         = &div4_clks[DIV4_S],
 122 };
 123
 124 static struct clk *late_main_clks[] = {
 125         &clkz_clk,
 126         &clkzs_clk,
 127 };
 128
 129 static struct clk_lookup lookups[] = {
 130         /* main clocks */
 131         CLKDEV_CON_ID("plla_clk", &plla_clk),
 132         CLKDEV_CON_ID("clkz_clk", &clkz_clk),
 133         CLKDEV_CON_ID("clkzs_clk", &clkzs_clk),
 134
 135         /* DIV4 clocks */
 136         CLKDEV_CON_ID("shyway_clk",     &div4_clks[DIV4_S]),
 137         CLKDEV_CON_ID("bus_clk",        &div4_clks[DIV4_OUT]),
 138         CLKDEV_CON_ID("shyway4_clk",    &div4_clks[DIV4_S4]),
 139         CLKDEV_CON_ID("shyway3_clk",    &div4_clks[DIV4_S3]),
 140         CLKDEV_CON_ID("shyway1_clk",    &div4_clks[DIV4_S1]),
 141         CLKDEV_CON_ID("peripheral_clk", &div4_clks[DIV4_P]),
 142
 143         /* MSTP32 clocks */
 144         CLKDEV_DEV_ID("sh_tmu.0", &mstp_clks[MSTP016]), /* TMU00 */
 145         CLKDEV_DEV_ID("sh_tmu.1", &mstp_clks[MSTP016]), /* TMU01 */
 146         CLKDEV_DEV_ID("sh-sci.0", &mstp_clks[MSTP026]), /* SCIF0 */
 147         CLKDEV_DEV_ID("sh-sci.1", &mstp_clks[MSTP025]), /* SCIF1 */
 148         CLKDEV_DEV_ID("sh-sci.2", &mstp_clks[MSTP024]), /* SCIF2 */
 149         CLKDEV_DEV_ID("sh-sci.3", &mstp_clks[MSTP023]), /* SCIF3 */
 150         CLKDEV_DEV_ID("sh-sci.4", &mstp_clks[MSTP022]), /* SCIF4 */
 151         CLKDEV_DEV_ID("sh-sci.5", &mstp_clks[MSTP021]), /* SCIF6 */
 152 };
 153
 154 void __init r8a7779_clock_init(void)
 155 {
 156         int k, ret = 0;
 157
 158         for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++)
 159                 ret = clk_register(main_clks[k]);
 160
 161         if (!ret)
 162                 ret = sh_clk_div4_register(div4_clks, DIV4_NR, &div4_table);
 163
 164         if (!ret)
 165                 ret = sh_clk_mstp32_register(mstp_clks, MSTP_NR);
 166
 167         for (k = 0; !ret && (k < ARRAY_SIZE(late_main_clks)); k++)
 168                 ret = clk_register(late_main_clks[k]);
 169
 170         clkdev_add_table(lookups, ARRAY_SIZE(lookups));
 171
 172         if (!ret)
 173                 clk_init();
 174         else
 175                 panic("failed to setup r8a7779 clocks\n");
 176 }