arch/sh/kernel/cpu/sh4a/clock-shx3.c

   1 /*
   2  * arch/sh/kernel/cpu/sh4/clock-shx3.c
   3  *
   4  * SH-X3 support for the clock framework
   5  *
   6  *  Copyright (C) 2006-2007  Renesas Technology Corp.
   7  *  Copyright (C) 2006-2007  Renesas Solutions Corp.
   8  *  Copyright (C) 2006-2010  Paul Mundt
   9  *
  10  * This file is subject to the terms and conditions of the GNU General Public
  11  * License.  See the file "COPYING" in the main directory of this archive
  12  * for more details.
  13  */
  14 #include <linux/init.h>
  15 #include <linux/kernel.h>
  16 #include <linux/io.h>
  17 #include <linux/clkdev.h>
  18 #include <asm/clock.h>
  19 #include <asm/freq.h>
  20
  21 /*
  22  * Default rate for the root input clock, reset this with clk_set_rate()
  23  * from the platform code.
  24  */
  25 static struct clk extal_clk = {
  26         .rate           = 16666666,
  27 };
  28
  29 static unsigned long pll_recalc(struct clk *clk)
  30 {
  31         /* PLL1 has a fixed x72 multiplier.  */
  32         return clk->parent->rate * 72;
  33 }
  34
  35 static struct clk_ops pll_clk_ops = {
  36         .recalc         = pll_recalc,
  37 };
  38
  39 static struct clk pll_clk = {
  40         .ops            = &pll_clk_ops,
  41         .parent         = &extal_clk,
  42         .flags          = CLK_ENABLE_ON_INIT,
  43 };
  44
  45 static struct clk *clks[] = {
  46         &extal_clk,
  47         &pll_clk,
  48 };
  49
  50 static unsigned int div2[] = { 1, 2, 4, 6, 8, 12, 16, 18,
  51                                24, 32, 36, 48 };
  52
  53 static struct clk_div_mult_table div4_div_mult_table = {
  54         .divisors = div2,
  55         .nr_divisors = ARRAY_SIZE(div2),
  56 };
  57
  58 static struct clk_div4_table div4_table = {
  59         .div_mult_table = &div4_div_mult_table,
  60 };
  61
  62 enum { DIV4_I, DIV4_SH, DIV4_B, DIV4_DDR, DIV4_SHA, DIV4_P, DIV4_NR };
  63
  64 #define DIV4(_bit, _mask, _flags) \
  65   SH_CLK_DIV4(&pll_clk, FRQMR1, _bit, _mask, _flags)
  66
  67 struct clk div4_clks[DIV4_NR] = {
  68         [DIV4_P] = DIV4(0, 0x0f80, 0),
  69         [DIV4_SHA] = DIV4(4, 0x0ff0, 0),
  70         [DIV4_DDR] = DIV4(12, 0x000c, CLK_ENABLE_ON_INIT),
  71         [DIV4_B] = DIV4(16, 0x0fe0, CLK_ENABLE_ON_INIT),
  72         [DIV4_SH] = DIV4(20, 0x000c, CLK_ENABLE_ON_INIT),
  73         [DIV4_I] = DIV4(28, 0x000e, CLK_ENABLE_ON_INIT),
  74 };
  75
  76 #define MSTPCR0         0xffc00030
  77 #define MSTPCR1         0xffc00034
  78
  79 enum { MSTP027, MSTP026, MSTP025, MSTP024,
  80        MSTP009, MSTP008, MSTP003, MSTP002,
  81        MSTP001, MSTP000, MSTP119, MSTP105,
  82        MSTP104, MSTP_NR };
  83
  84 static struct clk mstp_clks[MSTP_NR] = {
  85         /* MSTPCR0 */
  86         [MSTP027] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 27, 0),
  87         [MSTP026] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 26, 0),
  88         [MSTP025] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 25, 0),
  89         [MSTP024] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 24, 0),
  90         [MSTP009] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 9, 0),
  91         [MSTP008] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 8, 0),
  92         [MSTP003] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 3, 0),
  93         [MSTP002] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 2, 0),
  94         [MSTP001] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 1, 0),
  95         [MSTP000] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 0, 0),
  96
  97         /* MSTPCR1 */
  98         [MSTP119] = SH_CLK_MSTP32(NULL, MSTPCR1, 19, 0),
  99         [MSTP105] = SH_CLK_MSTP32(NULL, MSTPCR1, 5, 0),
 100         [MSTP104] = SH_CLK_MSTP32(NULL, MSTPCR1, 4, 0),
 101 };
 102
 103 static struct clk_lookup lookups[] = {
 104         /* main clocks */
 105         CLKDEV_CON_ID("extal", &extal_clk),
 106         CLKDEV_CON_ID("pll_clk", &pll_clk),
 107
 108         /* DIV4 clocks */
 109         CLKDEV_CON_ID("peripheral_clk", &div4_clks[DIV4_P]),
 110         CLKDEV_CON_ID("shywaya_clk", &div4_clks[DIV4_SHA]),
 111         CLKDEV_CON_ID("ddr_clk", &div4_clks[DIV4_DDR]),
 112         CLKDEV_CON_ID("bus_clk", &div4_clks[DIV4_B]),
 113         CLKDEV_CON_ID("shyway_clk", &div4_clks[DIV4_SH]),
 114         CLKDEV_CON_ID("cpu_clk", &div4_clks[DIV4_I]),
 115
 116         /* MSTP32 clocks */
 117         CLKDEV_ICK_ID("sci_fck", "sh-sci.3", &mstp_clks[MSTP027]),
 118         CLKDEV_ICK_ID("sci_fck", "sh-sci.2", &mstp_clks[MSTP026]),
 119         CLKDEV_ICK_ID("sci_fck", "sh-sci.1", &mstp_clks[MSTP025]),
 120         CLKDEV_ICK_ID("sci_fck", "sh-sci.0", &mstp_clks[MSTP024]),
 121
 122         CLKDEV_CON_ID("h8ex_fck", &mstp_clks[MSTP003]),
 123         CLKDEV_CON_ID("csm_fck", &mstp_clks[MSTP002]),
 124         CLKDEV_CON_ID("fe1_fck", &mstp_clks[MSTP001]),
 125         CLKDEV_CON_ID("fe0_fck", &mstp_clks[MSTP000]),
 126
 127         CLKDEV_ICK_ID("tmu_fck", "sh_tmu.0", &mstp_clks[MSTP008]),
 128         CLKDEV_ICK_ID("tmu_fck", "sh_tmu.1", &mstp_clks[MSTP008]),
 129         CLKDEV_ICK_ID("tmu_fck", "sh_tmu.2", &mstp_clks[MSTP008]),
 130         CLKDEV_ICK_ID("tmu_fck", "sh_tmu.3", &mstp_clks[MSTP009]),
 131         CLKDEV_ICK_ID("tmu_fck", "sh_tmu.4", &mstp_clks[MSTP009]),
 132         CLKDEV_ICK_ID("tmu_fck", "sh_tmu.5", &mstp_clks[MSTP009]),
 133
 134         CLKDEV_CON_ID("hudi_fck", &mstp_clks[MSTP119]),
 135         CLKDEV_CON_ID("dmac_11_6_fck", &mstp_clks[MSTP105]),
 136         CLKDEV_CON_ID("dmac_5_0_fck", &mstp_clks[MSTP104]),
 137 };
 138
 139 int __init arch_clk_init(void)
 140 {
 141         int i, ret = 0;
 142
 143         for (i = 0; i < ARRAY_SIZE(clks); i++)
 144                 ret |= clk_register(clks[i]);
 145         for (i = 0; i < ARRAY_SIZE(lookups); i++)
 146                 clkdev_add(&lookups[i]);
 147
 148         if (!ret)
 149                 ret = sh_clk_div4_register(div4_clks, ARRAY_SIZE(div4_clks),
 150                                            &div4_table);
 151         if (!ret)
 152                 ret = sh_clk_mstp32_register(mstp_clks, MSTP_NR);
 153
 154         return ret;
 155 }