drivers/clk/ingenic/jz4725b-cgu.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Ingenic JZ4725B SoC CGU driver
   4  *
   5  * Copyright (C) 2018 Paul Cercueil
   6  * Author: Paul Cercueil <paul@crapouillou.net>
   7  */
   8
   9 #include <linux/clk-provider.h>
  10 #include <linux/delay.h>
  11 #include <linux/of.h>
  12
  13 #include <dt-bindings/clock/jz4725b-cgu.h>
  14
  15 #include "cgu.h"
  16 #include "pm.h"
  17
  18 /* CGU register offsets */
  19 #define CGU_REG_CPCCR           0x00
  20 #define CGU_REG_LCR             0x04
  21 #define CGU_REG_CPPCR           0x10
  22 #define CGU_REG_CLKGR           0x20
  23 #define CGU_REG_OPCR            0x24
  24 #define CGU_REG_I2SCDR          0x60
  25 #define CGU_REG_LPCDR           0x64
  26 #define CGU_REG_MSCCDR          0x68
  27 #define CGU_REG_SSICDR          0x74
  28 #define CGU_REG_CIMCDR          0x78
  29
  30 /* bits within the LCR register */
  31 #define LCR_SLEEP               BIT(0)
  32
  33 static struct ingenic_cgu *cgu;
  34
  35 static const s8 pll_od_encoding[4] = {
  36         0x0, 0x1, -1, 0x3,
  37 };
  38
  39 static const u8 jz4725b_cgu_cpccr_div_table[] = {
  40         1, 2, 3, 4, 6, 8,
  41 };
  42
  43 static const u8 jz4725b_cgu_pll_half_div_table[] = {
  44         2, 1,
  45 };
  46
  47 static const struct ingenic_cgu_clk_info jz4725b_cgu_clocks[] = {
  48
  49         /* External clocks */
  50
  51         [JZ4725B_CLK_EXT] = { "ext", CGU_CLK_EXT },
  52         [JZ4725B_CLK_OSC32K] = { "osc32k", CGU_CLK_EXT },
  53
  54         [JZ4725B_CLK_PLL] = {
  55                 "pll", CGU_CLK_PLL,
  56                 .parents = { JZ4725B_CLK_EXT, -1, -1, -1 },
  57                 .pll = {
  58                         .reg = CGU_REG_CPPCR,
  59                         .rate_multiplier = 1,
  60                         .m_shift = 23,
  61                         .m_bits = 9,
  62                         .m_offset = 2,
  63                         .n_shift = 18,
  64                         .n_bits = 5,
  65                         .n_offset = 2,
  66                         .od_shift = 16,
  67                         .od_bits = 2,
  68                         .od_max = 4,
  69                         .od_encoding = pll_od_encoding,
  70                         .stable_bit = 10,
  71                         .bypass_reg = CGU_REG_CPPCR,
  72                         .bypass_bit = 9,
  73                         .enable_bit = 8,
  74                 },
  75         },
  76
  77         /* Muxes & dividers */
  78
  79         [JZ4725B_CLK_PLL_HALF] = {
  80                 "pll half", CGU_CLK_DIV,
  81                 .parents = { JZ4725B_CLK_PLL, -1, -1, -1 },
  82                 .div = {
  83                         CGU_REG_CPCCR, 21, 1, 1, -1, -1, -1,
  84                         jz4725b_cgu_pll_half_div_table,
  85                 },
  86         },
  87
  88         [JZ4725B_CLK_CCLK] = {
  89                 "cclk", CGU_CLK_DIV,
  90                 .parents = { JZ4725B_CLK_PLL, -1, -1, -1 },
  91                 .div = {
  92                         CGU_REG_CPCCR, 0, 1, 4, 22, -1, -1,
  93                         jz4725b_cgu_cpccr_div_table,
  94                 },
  95         },
  96
  97         [JZ4725B_CLK_HCLK] = {
  98                 "hclk", CGU_CLK_DIV,
  99                 .parents = { JZ4725B_CLK_PLL, -1, -1, -1 },
 100                 .div = {
 101                         CGU_REG_CPCCR, 4, 1, 4, 22, -1, -1,
 102                         jz4725b_cgu_cpccr_div_table,
 103                 },
 104         },
 105
 106         [JZ4725B_CLK_PCLK] = {
 107                 "pclk", CGU_CLK_DIV,
 108                 .parents = { JZ4725B_CLK_PLL, -1, -1, -1 },
 109                 .div = {
 110                         CGU_REG_CPCCR, 8, 1, 4, 22, -1, -1,
 111                         jz4725b_cgu_cpccr_div_table,
 112                 },
 113         },
 114
 115         [JZ4725B_CLK_MCLK] = {
 116                 "mclk", CGU_CLK_DIV,
 117                 .parents = { JZ4725B_CLK_PLL, -1, -1, -1 },
 118                 .div = {
 119                         CGU_REG_CPCCR, 12, 1, 4, 22, -1, -1,
 120                         jz4725b_cgu_cpccr_div_table,
 121                 },
 122         },
 123
 124         [JZ4725B_CLK_IPU] = {
 125                 "ipu", CGU_CLK_DIV | CGU_CLK_GATE,
 126                 .parents = { JZ4725B_CLK_PLL, -1, -1, -1 },
 127                 .div = {
 128                         CGU_REG_CPCCR, 16, 1, 4, 22, -1, -1,
 129                         jz4725b_cgu_cpccr_div_table,
 130                 },
 131                 .gate = { CGU_REG_CLKGR, 13 },
 132         },
 133
 134         [JZ4725B_CLK_LCD] = {
 135                 "lcd", CGU_CLK_DIV | CGU_CLK_GATE,
 136                 .parents = { JZ4725B_CLK_PLL_HALF, -1, -1, -1 },
 137                 .div = { CGU_REG_LPCDR, 0, 1, 11, -1, -1, -1 },
 138                 .gate = { CGU_REG_CLKGR, 9 },
 139         },
 140
 141         [JZ4725B_CLK_I2S] = {
 142                 "i2s", CGU_CLK_MUX | CGU_CLK_DIV | CGU_CLK_GATE,
 143                 .parents = { JZ4725B_CLK_EXT, JZ4725B_CLK_PLL_HALF, -1, -1 },
 144                 .mux = { CGU_REG_CPCCR, 31, 1 },
 145                 .div = { CGU_REG_I2SCDR, 0, 1, 9, -1, -1, -1 },
 146                 .gate = { CGU_REG_CLKGR, 6 },
 147         },
 148
 149         [JZ4725B_CLK_SPI] = {
 150                 "spi", CGU_CLK_MUX | CGU_CLK_DIV | CGU_CLK_GATE,
 151                 .parents = { JZ4725B_CLK_EXT, JZ4725B_CLK_PLL, -1, -1 },
 152                 .mux = { CGU_REG_SSICDR, 31, 1 },
 153                 .div = { CGU_REG_SSICDR, 0, 1, 4, -1, -1, -1 },
 154                 .gate = { CGU_REG_CLKGR, 4 },
 155         },
 156
 157         [JZ4725B_CLK_MMC_MUX] = {
 158                 "mmc_mux", CGU_CLK_DIV,
 159                 .parents = { JZ4725B_CLK_PLL_HALF, -1, -1, -1 },
 160                 .div = { CGU_REG_MSCCDR, 0, 1, 5, -1, -1, -1 },
 161         },
 162
 163         [JZ4725B_CLK_UDC] = {
 164                 "udc", CGU_CLK_MUX | CGU_CLK_DIV,
 165                 .parents = { JZ4725B_CLK_EXT, JZ4725B_CLK_PLL_HALF, -1, -1 },
 166                 .mux = { CGU_REG_CPCCR, 29, 1 },
 167                 .div = { CGU_REG_CPCCR, 23, 1, 6, -1, -1, -1 },
 168         },
 169
 170         /* Gate-only clocks */
 171
 172         [JZ4725B_CLK_UART] = {
 173                 "uart", CGU_CLK_GATE,
 174                 .parents = { JZ4725B_CLK_EXT, -1, -1, -1 },
 175                 .gate = { CGU_REG_CLKGR, 0 },
 176         },
 177
 178         [JZ4725B_CLK_DMA] = {
 179                 "dma", CGU_CLK_GATE,
 180                 .parents = { JZ4725B_CLK_PCLK, -1, -1, -1 },
 181                 .gate = { CGU_REG_CLKGR, 12 },
 182         },
 183
 184         [JZ4725B_CLK_ADC] = {
 185                 "adc", CGU_CLK_GATE,
 186                 .parents = { JZ4725B_CLK_EXT, -1, -1, -1 },
 187                 .gate = { CGU_REG_CLKGR, 7 },
 188         },
 189
 190         [JZ4725B_CLK_I2C] = {
 191                 "i2c", CGU_CLK_GATE,
 192                 .parents = { JZ4725B_CLK_EXT, -1, -1, -1 },
 193                 .gate = { CGU_REG_CLKGR, 3 },
 194         },
 195
 196         [JZ4725B_CLK_AIC] = {
 197                 "aic", CGU_CLK_GATE,
 198                 .parents = { JZ4725B_CLK_EXT, -1, -1, -1 },
 199                 .gate = { CGU_REG_CLKGR, 5 },
 200         },
 201
 202         [JZ4725B_CLK_MMC0] = {
 203                 "mmc0", CGU_CLK_GATE,
 204                 .parents = { JZ4725B_CLK_MMC_MUX, -1, -1, -1 },
 205                 .gate = { CGU_REG_CLKGR, 6 },
 206         },
 207
 208         [JZ4725B_CLK_MMC1] = {
 209                 "mmc1", CGU_CLK_GATE,
 210                 .parents = { JZ4725B_CLK_MMC_MUX, -1, -1, -1 },
 211                 .gate = { CGU_REG_CLKGR, 16 },
 212         },
 213
 214         [JZ4725B_CLK_BCH] = {
 215                 "bch", CGU_CLK_GATE,
 216                 .parents = { JZ4725B_CLK_MCLK/* not sure */, -1, -1, -1 },
 217                 .gate = { CGU_REG_CLKGR, 11 },
 218         },
 219
 220         [JZ4725B_CLK_TCU] = {
 221                 "tcu", CGU_CLK_GATE,
 222                 .parents = { JZ4725B_CLK_EXT/* not sure */, -1, -1, -1 },
 223                 .gate = { CGU_REG_CLKGR, 1 },
 224         },
 225
 226         [JZ4725B_CLK_EXT512] = {
 227                 "ext/512", CGU_CLK_FIXDIV,
 228                 .parents = { JZ4725B_CLK_EXT },
 229
 230                 /* Doc calls it EXT512, but it seems to be /256... */
 231                 .fixdiv = { 256 },
 232         },
 233
 234         [JZ4725B_CLK_RTC] = {
 235                 "rtc", CGU_CLK_MUX,
 236                 .parents = { JZ4725B_CLK_EXT512, JZ4725B_CLK_OSC32K, -1, -1 },
 237                 .mux = { CGU_REG_OPCR, 2, 1},
 238         },
 239
 240         [JZ4725B_CLK_UDC_PHY] = {
 241                 "udc_phy", CGU_CLK_GATE,
 242                 .parents = { JZ4725B_CLK_EXT, -1, -1, -1 },
 243                 .gate = { CGU_REG_OPCR, 6, true },
 244         },
 245 };
 246
 247 static void __init jz4725b_cgu_init(struct device_node *np)
 248 {
 249         int retval;
 250
 251         cgu = ingenic_cgu_new(jz4725b_cgu_clocks,
 252                               ARRAY_SIZE(jz4725b_cgu_clocks), np);
 253         if (!cgu) {
 254                 pr_err("%s: failed to initialise CGU\n", __func__);
 255                 return;
 256         }
 257
 258         retval = ingenic_cgu_register_clocks(cgu);
 259         if (retval)
 260                 pr_err("%s: failed to register CGU Clocks\n", __func__);
 261
 262         ingenic_cgu_register_syscore_ops(cgu);
 263 }
 264 CLK_OF_DECLARE_DRIVER(jz4725b_cgu, "ingenic,jz4725b-cgu", jz4725b_cgu_init);