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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * arch/sh/kernel/cpu/sh4/clock-shx3.c
   4  *
   5  * SH-X3 support for the clock framework
   6  *
   7  *  Copyright (C) 2006-2007  Renesas Technology Corp.
   8  *  Copyright (C) 2006-2007  Renesas Solutions Corp.
   9  *  Copyright (C) 2006-2010  Paul Mundt
  10  */
  11 #include <linux/init.h>
  12 #include <linux/kernel.h>
  13 #include <linux/io.h>
  14 #include <linux/clkdev.h>
  15 #include <asm/clock.h>
  16 #include <asm/freq.h>
  17
  18 /*
  19  * Default rate for the root input clock, reset this with clk_set_rate()
  20  * from the platform code.
  21  */
  22 static struct clk extal_clk = {
  23         .rate           = 16666666,
  24 };
  25
  26 static unsigned long pll_recalc(struct clk *clk)
  27 {
  28         /* PLL1 has a fixed x72 multiplier.  */
  29         return clk->parent->rate * 72;
  30 }
  31
  32 static struct sh_clk_ops pll_clk_ops = {
  33         .recalc         = pll_recalc,
  34 };
  35
  36 static struct clk pll_clk = {
  37         .ops            = &pll_clk_ops,
  38         .parent         = &extal_clk,
  39         .flags          = CLK_ENABLE_ON_INIT,
  40 };
  41
  42 static struct clk *clks[] = {
  43         &extal_clk,
  44         &pll_clk,
  45 };
  46
  47 static unsigned int div2[] = { 1, 2, 4, 6, 8, 12, 16, 18,
  48                                24, 32, 36, 48 };
  49
  50 static struct clk_div_mult_table div4_div_mult_table = {
  51         .divisors = div2,
  52         .nr_divisors = ARRAY_SIZE(div2),
  53 };
  54
  55 static struct clk_div4_table div4_table = {
  56         .div_mult_table = &div4_div_mult_table,
  57 };
  58
  59 enum { DIV4_I, DIV4_SH, DIV4_B, DIV4_DDR, DIV4_SHA, DIV4_P, DIV4_NR };
  60
  61 #define DIV4(_bit, _mask, _flags) \
  62   SH_CLK_DIV4(&pll_clk, FRQMR1, _bit, _mask, _flags)
  63
  64 struct clk div4_clks[DIV4_NR] = {
  65         [DIV4_P] = DIV4(0, 0x0f80, 0),
  66         [DIV4_SHA] = DIV4(4, 0x0ff0, 0),
  67         [DIV4_DDR] = DIV4(12, 0x000c, CLK_ENABLE_ON_INIT),
  68         [DIV4_B] = DIV4(16, 0x0fe0, CLK_ENABLE_ON_INIT),
  69         [DIV4_SH] = DIV4(20, 0x000c, CLK_ENABLE_ON_INIT),
  70         [DIV4_I] = DIV4(28, 0x000e, CLK_ENABLE_ON_INIT),
  71 };
  72
  73 #define MSTPCR0         0xffc00030
  74 #define MSTPCR1         0xffc00034
  75
  76 enum { MSTP027, MSTP026, MSTP025, MSTP024,
  77        MSTP009, MSTP008, MSTP003, MSTP002,
  78        MSTP001, MSTP000, MSTP119, MSTP105,
  79        MSTP104, MSTP_NR };
  80
  81 static struct clk mstp_clks[MSTP_NR] = {
  82         /* MSTPCR0 */
  83         [MSTP027] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 27, 0),
  84         [MSTP026] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 26, 0),
  85         [MSTP025] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 25, 0),
  86         [MSTP024] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 24, 0),
  87         [MSTP009] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 9, 0),
  88         [MSTP008] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 8, 0),
  89         [MSTP003] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 3, 0),
  90         [MSTP002] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 2, 0),
  91         [MSTP001] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 1, 0),
  92         [MSTP000] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 0, 0),
  93
  94         /* MSTPCR1 */
  95         [MSTP119] = SH_CLK_MSTP32(NULL, MSTPCR1, 19, 0),
  96         [MSTP105] = SH_CLK_MSTP32(NULL, MSTPCR1, 5, 0),
  97         [MSTP104] = SH_CLK_MSTP32(NULL, MSTPCR1, 4, 0),
  98 };
  99
 100 static struct clk_lookup lookups[] = {
 101         /* main clocks */
 102         CLKDEV_CON_ID("extal", &extal_clk),
 103         CLKDEV_CON_ID("pll_clk", &pll_clk),
 104
 105         /* DIV4 clocks */
 106         CLKDEV_CON_ID("peripheral_clk", &div4_clks[DIV4_P]),
 107         CLKDEV_CON_ID("shywaya_clk", &div4_clks[DIV4_SHA]),
 108         CLKDEV_CON_ID("ddr_clk", &div4_clks[DIV4_DDR]),
 109         CLKDEV_CON_ID("bus_clk", &div4_clks[DIV4_B]),
 110         CLKDEV_CON_ID("shyway_clk", &div4_clks[DIV4_SH]),
 111         CLKDEV_CON_ID("cpu_clk", &div4_clks[DIV4_I]),
 112
 113         /* MSTP32 clocks */
 114         CLKDEV_ICK_ID("fck", "sh-sci.3", &mstp_clks[MSTP027]),
 115         CLKDEV_ICK_ID("fck", "sh-sci.2", &mstp_clks[MSTP026]),
 116         CLKDEV_ICK_ID("fck", "sh-sci.1", &mstp_clks[MSTP025]),
 117         CLKDEV_ICK_ID("fck", "sh-sci.0", &mstp_clks[MSTP024]),
 118
 119         CLKDEV_CON_ID("h8ex_fck", &mstp_clks[MSTP003]),
 120         CLKDEV_CON_ID("csm_fck", &mstp_clks[MSTP002]),
 121         CLKDEV_CON_ID("fe1_fck", &mstp_clks[MSTP001]),
 122         CLKDEV_CON_ID("fe0_fck", &mstp_clks[MSTP000]),
 123
 124         CLKDEV_ICK_ID("fck", "sh-tmu.0", &mstp_clks[MSTP008]),
 125         CLKDEV_ICK_ID("fck", "sh-tmu.1", &mstp_clks[MSTP009]),
 126
 127         CLKDEV_CON_ID("hudi_fck", &mstp_clks[MSTP119]),
 128         CLKDEV_CON_ID("dmac_11_6_fck", &mstp_clks[MSTP105]),
 129         CLKDEV_CON_ID("dmac_5_0_fck", &mstp_clks[MSTP104]),
 130 };
 131
 132 int __init arch_clk_init(void)
 133 {
 134         int i, ret = 0;
 135
 136         for (i = 0; i < ARRAY_SIZE(clks); i++)
 137                 ret |= clk_register(clks[i]);
 138
 139         clkdev_add_table(lookups, ARRAY_SIZE(lookups));
 140
 141         if (!ret)
 142                 ret = sh_clk_div4_register(div4_clks, ARRAY_SIZE(div4_clks),
 143                                            &div4_table);
 144         if (!ret)
 145                 ret = sh_clk_mstp_register(mstp_clks, MSTP_NR);
 146
 147         return ret;
 148 }