arch/sh/kernel/cpu/sh4a/clock-sh7722.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * arch/sh/kernel/cpu/sh4a/clock-sh7722.c
   4  *
   5  * SH7722 clock framework support
   6  *
   7  * Copyright (C) 2009 Magnus Damm
   8  */
   9 #include <linux/init.h>
  10 #include <linux/kernel.h>
  11 #include <linux/io.h>
  12 #include <linux/clkdev.h>
  13 #include <linux/sh_clk.h>
  14 #include <asm/clock.h>
  15 #include <cpu/sh7722.h>
  16
  17 /* SH7722 registers */
  18 #define FRQCR           0xa4150000
  19 #define VCLKCR          0xa4150004
  20 #define SCLKACR         0xa4150008
  21 #define SCLKBCR         0xa415000c
  22 #define IRDACLKCR       0xa4150018
  23 #define PLLCR           0xa4150024
  24 #define MSTPCR0         0xa4150030
  25 #define MSTPCR1         0xa4150034
  26 #define MSTPCR2         0xa4150038
  27 #define DLLFRQ          0xa4150050
  28
  29 /* Fixed 32 KHz root clock for RTC and Power Management purposes */
  30 static struct clk r_clk = {
  31         .rate           = 32768,
  32 };
  33
  34 /*
  35  * Default rate for the root input clock, reset this with clk_set_rate()
  36  * from the platform code.
  37  */
  38 struct clk extal_clk = {
  39         .rate           = 33333333,
  40 };
  41
  42 /* The dll block multiplies the 32khz r_clk, may be used instead of extal */
  43 static unsigned long dll_recalc(struct clk *clk)
  44 {
  45         unsigned long mult;
  46
  47         if (__raw_readl(PLLCR) & 0x1000)
  48                 mult = __raw_readl(DLLFRQ);
  49         else
  50                 mult = 0;
  51
  52         return clk->parent->rate * mult;
  53 }
  54
  55 static struct sh_clk_ops dll_clk_ops = {
  56         .recalc         = dll_recalc,
  57 };
  58
  59 static struct clk dll_clk = {
  60         .ops            = &dll_clk_ops,
  61         .parent         = &r_clk,
  62         .flags          = CLK_ENABLE_ON_INIT,
  63 };
  64
  65 static unsigned long pll_recalc(struct clk *clk)
  66 {
  67         unsigned long mult = 1;
  68         unsigned long div = 1;
  69
  70         if (__raw_readl(PLLCR) & 0x4000)
  71                 mult = (((__raw_readl(FRQCR) >> 24) & 0x1f) + 1);
  72         else
  73                 div = 2;
  74
  75         return (clk->parent->rate * mult) / div;
  76 }
  77
  78 static struct sh_clk_ops pll_clk_ops = {
  79         .recalc         = pll_recalc,
  80 };
  81
  82 static struct clk pll_clk = {
  83         .ops            = &pll_clk_ops,
  84         .flags          = CLK_ENABLE_ON_INIT,
  85 };
  86
  87 struct clk *main_clks[] = {
  88         &r_clk,
  89         &extal_clk,
  90         &dll_clk,
  91         &pll_clk,
  92 };
  93
  94 static int multipliers[] = { 1, 2, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1 };
  95 static int divisors[] = { 1, 3, 2, 5, 3, 4, 5, 6, 8, 10, 12, 16, 20 };
  96
  97 static struct clk_div_mult_table div4_div_mult_table = {
  98         .divisors = divisors,
  99         .nr_divisors = ARRAY_SIZE(divisors),
 100         .multipliers = multipliers,
 101         .nr_multipliers = ARRAY_SIZE(multipliers),
 102 };
 103
 104 static struct clk_div4_table div4_table = {
 105         .div_mult_table = &div4_div_mult_table,
 106 };
 107
 108 #define DIV4(_reg, _bit, _mask, _flags) \
 109   SH_CLK_DIV4(&pll_clk, _reg, _bit, _mask, _flags)
 110
 111 enum { DIV4_I, DIV4_U, DIV4_SH, DIV4_B, DIV4_B3, DIV4_P, DIV4_NR };
 112
 113 struct clk div4_clks[DIV4_NR] = {
 114         [DIV4_I] = DIV4(FRQCR, 20, 0x1fef, CLK_ENABLE_ON_INIT),
 115         [DIV4_U] = DIV4(FRQCR, 16, 0x1fff, CLK_ENABLE_ON_INIT),
 116         [DIV4_SH] = DIV4(FRQCR, 12, 0x1fff, CLK_ENABLE_ON_INIT),
 117         [DIV4_B] = DIV4(FRQCR, 8, 0x1fff, CLK_ENABLE_ON_INIT),
 118         [DIV4_B3] = DIV4(FRQCR, 4, 0x1fff, CLK_ENABLE_ON_INIT),
 119         [DIV4_P] = DIV4(FRQCR, 0, 0x1fff, 0),
 120 };
 121
 122 enum { DIV4_IRDA, DIV4_ENABLE_NR };
 123
 124 struct clk div4_enable_clks[DIV4_ENABLE_NR] = {
 125         [DIV4_IRDA] = DIV4(IRDACLKCR, 0, 0x1fff, 0),
 126 };
 127
 128 enum { DIV4_SIUA, DIV4_SIUB, DIV4_REPARENT_NR };
 129
 130 struct clk div4_reparent_clks[DIV4_REPARENT_NR] = {
 131         [DIV4_SIUA] = DIV4(SCLKACR, 0, 0x1fff, 0),
 132         [DIV4_SIUB] = DIV4(SCLKBCR, 0, 0x1fff, 0),
 133 };
 134
 135 enum { DIV6_V, DIV6_NR };
 136
 137 struct clk div6_clks[DIV6_NR] = {
 138         [DIV6_V] = SH_CLK_DIV6(&pll_clk, VCLKCR, 0),
 139 };
 140
 141 static struct clk mstp_clks[HWBLK_NR] = {
 142         [HWBLK_URAM]  = SH_CLK_MSTP32(&div4_clks[DIV4_U], MSTPCR0, 28, CLK_ENABLE_ON_INIT),
 143         [HWBLK_XYMEM] = SH_CLK_MSTP32(&div4_clks[DIV4_B], MSTPCR0, 26, CLK_ENABLE_ON_INIT),
 144         [HWBLK_TMU]   = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 15, 0),
 145         [HWBLK_CMT]   = SH_CLK_MSTP32(&r_clk,             MSTPCR0, 14, 0),
 146         [HWBLK_RWDT]  = SH_CLK_MSTP32(&r_clk,             MSTPCR0, 13, 0),
 147         [HWBLK_FLCTL] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 10, 0),
 148         [HWBLK_SCIF0] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 7, 0),
 149         [HWBLK_SCIF1] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 6, 0),
 150         [HWBLK_SCIF2] = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR0, 5, 0),
 151
 152         [HWBLK_IIC]   = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR1, 9, 0),
 153         [HWBLK_RTC]   = SH_CLK_MSTP32(&r_clk,             MSTPCR1, 8, 0),
 154
 155         [HWBLK_SDHI]  = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR2, 18, 0),
 156         [HWBLK_KEYSC] = SH_CLK_MSTP32(&r_clk,             MSTPCR2, 14, 0),
 157         [HWBLK_USBF]  = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR2, 11, 0),
 158         [HWBLK_2DG]   = SH_CLK_MSTP32(&div4_clks[DIV4_B], MSTPCR2, 9, 0),
 159         [HWBLK_SIU]   = SH_CLK_MSTP32(&div4_clks[DIV4_B], MSTPCR2, 8, 0),
 160         [HWBLK_JPU]   = SH_CLK_MSTP32(&div4_clks[DIV4_B], MSTPCR2, 6, 0),
 161         [HWBLK_VOU]   = SH_CLK_MSTP32(&div4_clks[DIV4_B], MSTPCR2, 5, 0),
 162         [HWBLK_BEU]   = SH_CLK_MSTP32(&div4_clks[DIV4_B], MSTPCR2, 4, 0),
 163         [HWBLK_CEU]   = SH_CLK_MSTP32(&div4_clks[DIV4_B], MSTPCR2, 3, 0),
 164         [HWBLK_VEU]   = SH_CLK_MSTP32(&div4_clks[DIV4_B], MSTPCR2, 2, 0),
 165         [HWBLK_VPU]   = SH_CLK_MSTP32(&div4_clks[DIV4_B], MSTPCR2, 1, 0),
 166         [HWBLK_LCDC]  = SH_CLK_MSTP32(&div4_clks[DIV4_P], MSTPCR2, 0, 0),
 167 };
 168
 169 static struct clk_lookup lookups[] = {
 170         /* main clocks */
 171         CLKDEV_CON_ID("rclk", &r_clk),
 172         CLKDEV_CON_ID("extal", &extal_clk),
 173         CLKDEV_CON_ID("dll_clk", &dll_clk),
 174         CLKDEV_CON_ID("pll_clk", &pll_clk),
 175
 176         /* DIV4 clocks */
 177         CLKDEV_CON_ID("cpu_clk", &div4_clks[DIV4_I]),
 178         CLKDEV_CON_ID("umem_clk", &div4_clks[DIV4_U]),
 179         CLKDEV_CON_ID("shyway_clk", &div4_clks[DIV4_SH]),
 180         CLKDEV_CON_ID("bus_clk", &div4_clks[DIV4_B]),
 181         CLKDEV_CON_ID("b3_clk", &div4_clks[DIV4_B3]),
 182         CLKDEV_CON_ID("peripheral_clk", &div4_clks[DIV4_P]),
 183         CLKDEV_CON_ID("irda_clk", &div4_enable_clks[DIV4_IRDA]),
 184         CLKDEV_CON_ID("siua_clk", &div4_reparent_clks[DIV4_SIUA]),
 185         CLKDEV_CON_ID("siub_clk", &div4_reparent_clks[DIV4_SIUB]),
 186
 187         /* DIV6 clocks */
 188         CLKDEV_CON_ID("video_clk", &div6_clks[DIV6_V]),
 189
 190         /* MSTP clocks */
 191         CLKDEV_CON_ID("uram0", &mstp_clks[HWBLK_URAM]),
 192         CLKDEV_CON_ID("xymem0", &mstp_clks[HWBLK_XYMEM]),
 193
 194         CLKDEV_ICK_ID("fck", "sh-tmu.0", &mstp_clks[HWBLK_TMU]),
 195
 196         CLKDEV_ICK_ID("fck", "sh-cmt-32.0", &mstp_clks[HWBLK_CMT]),
 197         CLKDEV_DEV_ID("sh-wdt.0", &mstp_clks[HWBLK_RWDT]),
 198         CLKDEV_CON_ID("flctl0", &mstp_clks[HWBLK_FLCTL]),
 199
 200         CLKDEV_DEV_ID("sh-sci.0", &mstp_clks[HWBLK_SCIF0]),
 201         CLKDEV_DEV_ID("sh-sci.1", &mstp_clks[HWBLK_SCIF1]),
 202         CLKDEV_DEV_ID("sh-sci.2", &mstp_clks[HWBLK_SCIF2]),
 203
 204         CLKDEV_DEV_ID("i2c-sh_mobile.0", &mstp_clks[HWBLK_IIC]),
 205         CLKDEV_CON_ID("rtc0", &mstp_clks[HWBLK_RTC]),
 206         CLKDEV_DEV_ID("sh_mobile_sdhi.0", &mstp_clks[HWBLK_SDHI]),
 207         CLKDEV_DEV_ID("sh_keysc.0", &mstp_clks[HWBLK_KEYSC]),
 208         CLKDEV_CON_ID("usbf0", &mstp_clks[HWBLK_USBF]),
 209         CLKDEV_CON_ID("2dg0", &mstp_clks[HWBLK_2DG]),
 210         CLKDEV_DEV_ID("siu-pcm-audio", &mstp_clks[HWBLK_SIU]),
 211         CLKDEV_DEV_ID("sh-vou.0", &mstp_clks[HWBLK_VOU]),
 212         CLKDEV_CON_ID("jpu0", &mstp_clks[HWBLK_JPU]),
 213         CLKDEV_CON_ID("beu0", &mstp_clks[HWBLK_BEU]),
 214         CLKDEV_DEV_ID("renesas-ceu.0", &mstp_clks[HWBLK_CEU]),
 215         CLKDEV_CON_ID("veu0", &mstp_clks[HWBLK_VEU]),
 216         CLKDEV_CON_ID("vpu0", &mstp_clks[HWBLK_VPU]),
 217         CLKDEV_DEV_ID("sh_mobile_lcdc_fb.0", &mstp_clks[HWBLK_LCDC]),
 218 };
 219
 220 int __init arch_clk_init(void)
 221 {
 222         int k, ret = 0;
 223
 224         /* autodetect extal or dll configuration */
 225         if (__raw_readl(PLLCR) & 0x1000)
 226                 pll_clk.parent = &dll_clk;
 227         else
 228                 pll_clk.parent = &extal_clk;
 229
 230         for (k = 0; !ret && (k < ARRAY_SIZE(main_clks)); k++)
 231                 ret = clk_register(main_clks[k]);
 232
 233         clkdev_add_table(lookups, ARRAY_SIZE(lookups));
 234
 235         if (!ret)
 236                 ret = sh_clk_div4_register(div4_clks, DIV4_NR, &div4_table);
 237
 238         if (!ret)
 239                 ret = sh_clk_div4_enable_register(div4_enable_clks,
 240                                         DIV4_ENABLE_NR, &div4_table);
 241
 242         if (!ret)
 243                 ret = sh_clk_div4_reparent_register(div4_reparent_clks,
 244                                         DIV4_REPARENT_NR, &div4_table);
 245
 246         if (!ret)
 247                 ret = sh_clk_div6_register(div6_clks, DIV6_NR);
 248
 249         if (!ret)
 250                 ret = sh_clk_mstp_register(mstp_clks, HWBLK_NR);
 251
 252         return ret;
 253 }