arch/sh/kernel/cpu/sh4a/clock-sh7785.c

   1 /*
   2  * arch/sh/kernel/cpu/sh4a/clock-sh7785.c
   3  *
   4  * SH7785 support for the clock framework
   5  *
   6  *  Copyright (C) 2007 - 2010  Paul Mundt
   7  *
   8  * This file is subject to the terms and conditions of the GNU General Public
   9  * License.  See the file "COPYING" in the main directory of this archive
  10  * for more details.
  11  */
  12 #include <linux/init.h>
  13 #include <linux/kernel.h>
  14 #include <linux/clk.h>
  15 #include <linux/io.h>
  16 #include <linux/cpufreq.h>
  17 #include <linux/clkdev.h>
  18 #include <asm/clock.h>
  19 #include <asm/freq.h>
  20 #include <cpu/sh7785.h>
  21
  22 /*
  23  * Default rate for the root input clock, reset this with clk_set_rate()
  24  * from the platform code.
  25  */
  26 static struct clk extal_clk = {
  27         .rate           = 33333333,
  28 };
  29
  30 static unsigned long pll_recalc(struct clk *clk)
  31 {
  32         int multiplier;
  33
  34         multiplier = test_mode_pin(MODE_PIN4) ? 36 : 72;
  35
  36         return clk->parent->rate * multiplier;
  37 }
  38
  39 static struct sh_clk_ops pll_clk_ops = {
  40         .recalc         = pll_recalc,
  41 };
  42
  43 static struct clk pll_clk = {
  44         .ops            = &pll_clk_ops,
  45         .parent         = &extal_clk,
  46         .flags          = CLK_ENABLE_ON_INIT,
  47 };
  48
  49 static struct clk *clks[] = {
  50         &extal_clk,
  51         &pll_clk,
  52 };
  53
  54 static unsigned int div2[] = { 1, 2, 4, 6, 8, 12, 16, 18,
  55                                24, 32, 36, 48 };
  56
  57 static struct clk_div_mult_table div4_div_mult_table = {
  58         .divisors = div2,
  59         .nr_divisors = ARRAY_SIZE(div2),
  60 };
  61
  62 static struct clk_div4_table div4_table = {
  63         .div_mult_table = &div4_div_mult_table,
  64 };
  65
  66 enum { DIV4_I, DIV4_U, DIV4_SH, DIV4_B, DIV4_DDR, DIV4_GA,
  67         DIV4_DU, DIV4_P, DIV4_NR };
  68
  69 #define DIV4(_bit, _mask, _flags) \
  70   SH_CLK_DIV4(&pll_clk, FRQMR1, _bit, _mask, _flags)
  71
  72 struct clk div4_clks[DIV4_NR] = {
  73         [DIV4_P] = DIV4(0, 0x0f80, 0),
  74         [DIV4_DU] = DIV4(4, 0x0ff0, 0),
  75         [DIV4_GA] = DIV4(8, 0x0030, 0),
  76         [DIV4_DDR] = DIV4(12, 0x000c, CLK_ENABLE_ON_INIT),
  77         [DIV4_B] = DIV4(16, 0x0fe0, CLK_ENABLE_ON_INIT),
  78         [DIV4_SH] = DIV4(20, 0x000c, CLK_ENABLE_ON_INIT),
  79         [DIV4_U] = DIV4(24, 0x000c, CLK_ENABLE_ON_INIT),
  80         [DIV4_I] = DIV4(28, 0x000e, CLK_ENABLE_ON_INIT),
  81 };
  82
  83 #define MSTPCR0         0xffc80030
  84 #define MSTPCR1         0xffc80034
  85
  86 enum { MSTP029, MSTP028, MSTP027, MSTP026, MSTP025, MSTP024,
  87        MSTP021, MSTP020, MSTP017, MSTP016,
  88        MSTP013, MSTP012, MSTP009, MSTP008, MSTP003, MSTP002,
  89        MSTP119, MSTP117, MSTP105, MSTP104, MSTP100,
  90        MSTP_NR };
  91
  92 static struct clk mstp_clks[MSTP_NR] = {
  93         /* MSTPCR0 */
  94         [MSTP029] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 29, 0),
  95         [MSTP028] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 28, 0),
  96         [MSTP027] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 27, 0),
  97         [MSTP026] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 26, 0),
  98         [MSTP025] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 25, 0),
  99         [MSTP024] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 24, 0),
 100         [MSTP021] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 21, 0),
 101         [MSTP020] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 20, 0),
 102         [MSTP017] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 17, 0),
 103         [MSTP016] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 16, 0),
 104         [MSTP013] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 13, 0),
 105         [MSTP012] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 12, 0),
 106         [MSTP009] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 9, 0),
 107         [MSTP008] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 8, 0),
 108         [MSTP003] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 3, 0),
 109         [MSTP002] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 2, 0),
 110
 111         /* MSTPCR1 */
 112         [MSTP119] = SH_CLK_MSTP32(NULL, MSTPCR1, 19, 0),
 113         [MSTP117] = SH_CLK_MSTP32(NULL, MSTPCR1, 17, 0),
 114         [MSTP105] = SH_CLK_MSTP32(NULL, MSTPCR1, 5, 0),
 115         [MSTP104] = SH_CLK_MSTP32(NULL, MSTPCR1, 4, 0),
 116         [MSTP100] = SH_CLK_MSTP32(NULL, MSTPCR1, 0, 0),
 117 };
 118
 119 static struct clk_lookup lookups[] = {
 120         /* main clocks */
 121         CLKDEV_CON_ID("extal", &extal_clk),
 122         CLKDEV_CON_ID("pll_clk", &pll_clk),
 123
 124         /* DIV4 clocks */
 125         CLKDEV_CON_ID("peripheral_clk", &div4_clks[DIV4_P]),
 126         CLKDEV_CON_ID("du_clk", &div4_clks[DIV4_DU]),
 127         CLKDEV_CON_ID("ga_clk", &div4_clks[DIV4_GA]),
 128         CLKDEV_CON_ID("ddr_clk", &div4_clks[DIV4_DDR]),
 129         CLKDEV_CON_ID("bus_clk", &div4_clks[DIV4_B]),
 130         CLKDEV_CON_ID("shyway_clk", &div4_clks[DIV4_SH]),
 131         CLKDEV_CON_ID("umem_clk", &div4_clks[DIV4_U]),
 132         CLKDEV_CON_ID("cpu_clk", &div4_clks[DIV4_I]),
 133
 134         /* MSTP32 clocks */
 135         CLKDEV_ICK_ID("sci_fck", "sh-sci.5", &mstp_clks[MSTP029]),
 136         CLKDEV_ICK_ID("sci_fck", "sh-sci.4", &mstp_clks[MSTP028]),
 137         CLKDEV_ICK_ID("sci_fck", "sh-sci.3", &mstp_clks[MSTP027]),
 138         CLKDEV_ICK_ID("sci_fck", "sh-sci.2", &mstp_clks[MSTP026]),
 139         CLKDEV_ICK_ID("sci_fck", "sh-sci.1", &mstp_clks[MSTP025]),
 140         CLKDEV_ICK_ID("sci_fck", "sh-sci.0", &mstp_clks[MSTP024]),
 141
 142         CLKDEV_CON_ID("ssi1_fck", &mstp_clks[MSTP021]),
 143         CLKDEV_CON_ID("ssi0_fck", &mstp_clks[MSTP020]),
 144         CLKDEV_CON_ID("hac1_fck", &mstp_clks[MSTP017]),
 145         CLKDEV_CON_ID("hac0_fck", &mstp_clks[MSTP016]),
 146         CLKDEV_CON_ID("mmcif_fck", &mstp_clks[MSTP013]),
 147         CLKDEV_CON_ID("flctl_fck", &mstp_clks[MSTP012]),
 148
 149         CLKDEV_ICK_ID("fck", "sh-tmu.0", &mstp_clks[MSTP008]),
 150         CLKDEV_ICK_ID("fck", "sh-tmu.1", &mstp_clks[MSTP009]),
 151
 152         CLKDEV_CON_ID("siof_fck", &mstp_clks[MSTP003]),
 153         CLKDEV_CON_ID("hspi_fck", &mstp_clks[MSTP002]),
 154         CLKDEV_CON_ID("hudi_fck", &mstp_clks[MSTP119]),
 155         CLKDEV_CON_ID("ubc0", &mstp_clks[MSTP117]),
 156         CLKDEV_CON_ID("dmac_11_6_fck", &mstp_clks[MSTP105]),
 157         CLKDEV_CON_ID("dmac_5_0_fck", &mstp_clks[MSTP104]),
 158         CLKDEV_CON_ID("gdta_fck", &mstp_clks[MSTP100]),
 159 };
 160
 161 int __init arch_clk_init(void)
 162 {
 163         int i, ret = 0;
 164
 165         for (i = 0; i < ARRAY_SIZE(clks); i++)
 166                 ret |= clk_register(clks[i]);
 167         for (i = 0; i < ARRAY_SIZE(lookups); i++)
 168                 clkdev_add(&lookups[i]);
 169
 170         if (!ret)
 171                 ret = sh_clk_div4_register(div4_clks, ARRAY_SIZE(div4_clks),
 172                                            &div4_table);
 173         if (!ret)
 174                 ret = sh_clk_mstp_register(mstp_clks, MSTP_NR);
 175
 176         return ret;
 177 }