root/arch/sh/kernel/cpu/sh4a/clock-sh7757.c

DEFINITIONS

1. pll_recalc
2. arch_clk_init

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * arch/sh/kernel/cpu/sh4/clock-sh7757.c
   4  *
   5  * SH7757 support for the clock framework
   6  *
   7  *  Copyright (C) 2009-2010  Renesas Solutions Corp.
   8  */
   9 #include <linux/init.h>
  10 #include <linux/kernel.h>
  11 #include <linux/io.h>
  12 #include <linux/clkdev.h>
  13 #include <asm/clock.h>
  14 #include <asm/freq.h>
  15 
  16 /*
  17  * Default rate for the root input clock, reset this with clk_set_rate()
  18  * from the platform code.
  19  */
  20 static struct clk extal_clk = {
  21         .rate           = 48000000,
  22 };
  23 
  24 static unsigned long pll_recalc(struct clk *clk)
  25 {
  26         int multiplier;
  27 
  28         multiplier = test_mode_pin(MODE_PIN0) ? 24 : 16;
  29 
  30         return clk->parent->rate * multiplier;
  31 }
  32 
  33 static struct sh_clk_ops pll_clk_ops = {
  34         .recalc         = pll_recalc,
  35 };
  36 
  37 static struct clk pll_clk = {
  38         .ops            = &pll_clk_ops,
  39         .parent         = &extal_clk,
  40         .flags          = CLK_ENABLE_ON_INIT,
  41 };
  42 
  43 static struct clk *clks[] = {
  44         &extal_clk,
  45         &pll_clk,
  46 };
  47 
  48 static unsigned int div2[] = { 1, 1, 2, 1, 1, 4, 1, 6,
  49                                1, 1, 1, 16, 1, 24, 1, 1 };
  50 
  51 static struct clk_div_mult_table div4_div_mult_table = {
  52         .divisors = div2,
  53         .nr_divisors = ARRAY_SIZE(div2),
  54 };
  55 
  56 static struct clk_div4_table div4_table = {
  57         .div_mult_table = &div4_div_mult_table,
  58 };
  59 
  60 enum { DIV4_I, DIV4_SH, DIV4_P, DIV4_NR };
  61 
  62 #define DIV4(_bit, _mask, _flags) \
  63   SH_CLK_DIV4(&pll_clk, FRQCR, _bit, _mask, _flags)
  64 
  65 struct clk div4_clks[DIV4_NR] = {
  66         /*
  67          * P clock is always enable, because some P clock modules is used
  68          * by Host PC.
  69          */
  70         [DIV4_P] = DIV4(0, 0x2800, CLK_ENABLE_ON_INIT),
  71         [DIV4_SH] = DIV4(12, 0x00a0, CLK_ENABLE_ON_INIT),
  72         [DIV4_I] = DIV4(20, 0x0004, CLK_ENABLE_ON_INIT),
  73 };
  74 
  75 #define MSTPCR0         0xffc80030
  76 #define MSTPCR1         0xffc80034
  77 #define MSTPCR2         0xffc10028
  78 
  79 enum { MSTP004, MSTP000, MSTP127, MSTP114, MSTP113, MSTP112,
  80        MSTP111, MSTP110, MSTP103, MSTP102, MSTP220,
  81        MSTP_NR };
  82 
  83 static struct clk mstp_clks[MSTP_NR] = {
  84         /* MSTPCR0 */
  85         [MSTP004] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 4, 0),
  86         [MSTP000] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 0, 0),
  87 
  88         /* MSTPCR1 */
  89         [MSTP127] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR1, 27, 0),
  90         [MSTP114] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR1, 14, 0),
  91         [MSTP113] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR1, 13, 0),
  92         [MSTP112] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR1, 12, 0),
  93         [MSTP111] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR1, 11, 0),
  94         [MSTP110] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR1, 10, 0),
  95         [MSTP103] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR1, 3, 0),
  96         [MSTP102] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR1, 2, 0),
  97 
  98         /* MSTPCR2 */
  99         [MSTP220] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR2, 20, 0),
 100 };
 101 
 102 static struct clk_lookup lookups[] = {
 103         /* main clocks */
 104         CLKDEV_CON_ID("extal", &extal_clk),
 105         CLKDEV_CON_ID("pll_clk", &pll_clk),
 106 
 107         /* DIV4 clocks */
 108         CLKDEV_CON_ID("peripheral_clk", &div4_clks[DIV4_P]),
 109         CLKDEV_CON_ID("shyway_clk", &div4_clks[DIV4_SH]),
 110         CLKDEV_CON_ID("cpu_clk", &div4_clks[DIV4_I]),
 111 
 112         /* MSTP32 clocks */
 113         CLKDEV_DEV_ID("sh_mobile_sdhi.0", &mstp_clks[MSTP004]),
 114         CLKDEV_CON_ID("riic0", &mstp_clks[MSTP000]),
 115         CLKDEV_CON_ID("riic1", &mstp_clks[MSTP000]),
 116         CLKDEV_CON_ID("riic2", &mstp_clks[MSTP000]),
 117         CLKDEV_CON_ID("riic3", &mstp_clks[MSTP000]),
 118         CLKDEV_CON_ID("riic4", &mstp_clks[MSTP000]),
 119         CLKDEV_CON_ID("riic5", &mstp_clks[MSTP000]),
 120         CLKDEV_CON_ID("riic6", &mstp_clks[MSTP000]),
 121         CLKDEV_CON_ID("riic7", &mstp_clks[MSTP000]),
 122 
 123         CLKDEV_ICK_ID("fck", "sh-tmu.0", &mstp_clks[MSTP113]),
 124         CLKDEV_ICK_ID("fck", "sh-tmu.1", &mstp_clks[MSTP114]),
 125         CLKDEV_ICK_ID("fck", "sh-sci.2", &mstp_clks[MSTP112]),
 126         CLKDEV_ICK_ID("fck", "sh-sci.1", &mstp_clks[MSTP111]),
 127         CLKDEV_ICK_ID("fck", "sh-sci.0", &mstp_clks[MSTP110]),
 128 
 129         CLKDEV_CON_ID("usb_fck", &mstp_clks[MSTP103]),
 130         CLKDEV_DEV_ID("renesas_usbhs.0", &mstp_clks[MSTP102]),
 131         CLKDEV_CON_ID("mmc0", &mstp_clks[MSTP220]),
 132         CLKDEV_DEV_ID("rspi.2", &mstp_clks[MSTP127]),
 133 };
 134 
 135 int __init arch_clk_init(void)
 136 {
 137         int i, ret = 0;
 138 
 139         for (i = 0; i < ARRAY_SIZE(clks); i++)
 140                 ret |= clk_register(clks[i]);
 141 
 142         clkdev_add_table(lookups, ARRAY_SIZE(lookups));
 143 
 144         if (!ret)
 145                 ret = sh_clk_div4_register(div4_clks, ARRAY_SIZE(div4_clks),
 146                                            &div4_table);
 147         if (!ret)
 148                 ret = sh_clk_mstp_register(mstp_clks, MSTP_NR);
 149 
 150         return ret;
 151 }
 152