drivers/clk/ingenic/jz4740-cgu.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Ingenic JZ4740 SoC CGU driver
   4  *
   5  * Copyright (c) 2015 Imagination Technologies
   6  * Author: Paul Burton <paul.burton@mips.com>
   7  */
   8
   9 #include <linux/clk-provider.h>
  10 #include <linux/delay.h>
  11 #include <linux/io.h>
  12 #include <linux/of.h>
  13
  14 #include <dt-bindings/clock/jz4740-cgu.h>
  15
  16 #include "cgu.h"
  17 #include "pm.h"
  18
  19 /* CGU register offsets */
  20 #define CGU_REG_CPCCR           0x00
  21 #define CGU_REG_LCR             0x04
  22 #define CGU_REG_CPPCR           0x10
  23 #define CGU_REG_CLKGR           0x20
  24 #define CGU_REG_SCR             0x24
  25 #define CGU_REG_I2SCDR          0x60
  26 #define CGU_REG_LPCDR           0x64
  27 #define CGU_REG_MSCCDR          0x68
  28 #define CGU_REG_UHCCDR          0x6c
  29 #define CGU_REG_SSICDR          0x74
  30
  31 /* bits within a PLL control register */
  32 #define PLLCTL_M_SHIFT          23
  33 #define PLLCTL_M_MASK           (0x1ff << PLLCTL_M_SHIFT)
  34 #define PLLCTL_N_SHIFT          18
  35 #define PLLCTL_N_MASK           (0x1f << PLLCTL_N_SHIFT)
  36 #define PLLCTL_OD_SHIFT         16
  37 #define PLLCTL_OD_MASK          (0x3 << PLLCTL_OD_SHIFT)
  38 #define PLLCTL_STABLE           (1 << 10)
  39 #define PLLCTL_BYPASS           (1 << 9)
  40 #define PLLCTL_ENABLE           (1 << 8)
  41
  42 /* bits within the LCR register */
  43 #define LCR_SLEEP               (1 << 0)
  44
  45 /* bits within the CLKGR register */
  46 #define CLKGR_UDC               (1 << 11)
  47
  48 static struct ingenic_cgu *cgu;
  49
  50 static const s8 pll_od_encoding[4] = {
  51         0x0, 0x1, -1, 0x3,
  52 };
  53
  54 static const u8 jz4740_cgu_cpccr_div_table[] = {
  55         1, 2, 3, 4, 6, 8, 12, 16, 24, 32,
  56 };
  57
  58 static const u8 jz4740_cgu_pll_half_div_table[] = {
  59         2, 1,
  60 };
  61
  62 static const struct ingenic_cgu_clk_info jz4740_cgu_clocks[] = {
  63
  64         /* External clocks */
  65
  66         [JZ4740_CLK_EXT] = { "ext", CGU_CLK_EXT },
  67         [JZ4740_CLK_RTC] = { "rtc", CGU_CLK_EXT },
  68
  69         [JZ4740_CLK_PLL] = {
  70                 "pll", CGU_CLK_PLL,
  71                 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
  72                 .pll = {
  73                         .reg = CGU_REG_CPPCR,
  74                         .rate_multiplier = 1,
  75                         .m_shift = 23,
  76                         .m_bits = 9,
  77                         .m_offset = 2,
  78                         .n_shift = 18,
  79                         .n_bits = 5,
  80                         .n_offset = 2,
  81                         .od_shift = 16,
  82                         .od_bits = 2,
  83                         .od_max = 4,
  84                         .od_encoding = pll_od_encoding,
  85                         .stable_bit = 10,
  86                         .bypass_reg = CGU_REG_CPPCR,
  87                         .bypass_bit = 9,
  88                         .enable_bit = 8,
  89                 },
  90         },
  91
  92         /* Muxes & dividers */
  93
  94         [JZ4740_CLK_PLL_HALF] = {
  95                 "pll half", CGU_CLK_DIV,
  96                 .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
  97                 .div = {
  98                         CGU_REG_CPCCR, 21, 1, 1, -1, -1, -1,
  99                         jz4740_cgu_pll_half_div_table,
 100                 },
 101         },
 102
 103         [JZ4740_CLK_CCLK] = {
 104                 "cclk", CGU_CLK_DIV,
 105                 .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
 106                 .div = {
 107                         CGU_REG_CPCCR, 0, 1, 4, 22, -1, -1,
 108                         jz4740_cgu_cpccr_div_table,
 109                 },
 110         },
 111
 112         [JZ4740_CLK_HCLK] = {
 113                 "hclk", CGU_CLK_DIV,
 114                 .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
 115                 .div = {
 116                         CGU_REG_CPCCR, 4, 1, 4, 22, -1, -1,
 117                         jz4740_cgu_cpccr_div_table,
 118                 },
 119         },
 120
 121         [JZ4740_CLK_PCLK] = {
 122                 "pclk", CGU_CLK_DIV,
 123                 .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
 124                 .div = {
 125                         CGU_REG_CPCCR, 8, 1, 4, 22, -1, -1,
 126                         jz4740_cgu_cpccr_div_table,
 127                 },
 128         },
 129
 130         [JZ4740_CLK_MCLK] = {
 131                 "mclk", CGU_CLK_DIV,
 132                 .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
 133                 .div = {
 134                         CGU_REG_CPCCR, 12, 1, 4, 22, -1, -1,
 135                         jz4740_cgu_cpccr_div_table,
 136                 },
 137         },
 138
 139         [JZ4740_CLK_LCD] = {
 140                 "lcd", CGU_CLK_DIV | CGU_CLK_GATE,
 141                 .parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
 142                 .div = {
 143                         CGU_REG_CPCCR, 16, 1, 5, 22, -1, -1,
 144                         jz4740_cgu_cpccr_div_table,
 145                 },
 146                 .gate = { CGU_REG_CLKGR, 10 },
 147         },
 148
 149         [JZ4740_CLK_LCD_PCLK] = {
 150                 "lcd_pclk", CGU_CLK_DIV,
 151                 .parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
 152                 .div = { CGU_REG_LPCDR, 0, 1, 11, -1, -1, -1 },
 153         },
 154
 155         [JZ4740_CLK_I2S] = {
 156                 "i2s", CGU_CLK_MUX | CGU_CLK_DIV | CGU_CLK_GATE,
 157                 .parents = { JZ4740_CLK_EXT, JZ4740_CLK_PLL_HALF, -1, -1 },
 158                 .mux = { CGU_REG_CPCCR, 31, 1 },
 159                 .div = { CGU_REG_I2SCDR, 0, 1, 9, -1, -1, -1 },
 160                 .gate = { CGU_REG_CLKGR, 6 },
 161         },
 162
 163         [JZ4740_CLK_SPI] = {
 164                 "spi", CGU_CLK_MUX | CGU_CLK_DIV | CGU_CLK_GATE,
 165                 .parents = { JZ4740_CLK_EXT, JZ4740_CLK_PLL, -1, -1 },
 166                 .mux = { CGU_REG_SSICDR, 31, 1 },
 167                 .div = { CGU_REG_SSICDR, 0, 1, 4, -1, -1, -1 },
 168                 .gate = { CGU_REG_CLKGR, 4 },
 169         },
 170
 171         [JZ4740_CLK_MMC] = {
 172                 "mmc", CGU_CLK_DIV | CGU_CLK_GATE,
 173                 .parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
 174                 .div = { CGU_REG_MSCCDR, 0, 1, 5, -1, -1, -1 },
 175                 .gate = { CGU_REG_CLKGR, 7 },
 176         },
 177
 178         [JZ4740_CLK_UHC] = {
 179                 "uhc", CGU_CLK_DIV | CGU_CLK_GATE,
 180                 .parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
 181                 .div = { CGU_REG_UHCCDR, 0, 1, 4, -1, -1, -1 },
 182                 .gate = { CGU_REG_CLKGR, 14 },
 183         },
 184
 185         [JZ4740_CLK_UDC] = {
 186                 "udc", CGU_CLK_MUX | CGU_CLK_DIV | CGU_CLK_GATE,
 187                 .parents = { JZ4740_CLK_EXT, JZ4740_CLK_PLL_HALF, -1, -1 },
 188                 .mux = { CGU_REG_CPCCR, 29, 1 },
 189                 .div = { CGU_REG_CPCCR, 23, 1, 6, -1, -1, -1 },
 190                 .gate = { CGU_REG_SCR, 6, true },
 191         },
 192
 193         /* Gate-only clocks */
 194
 195         [JZ4740_CLK_UART0] = {
 196                 "uart0", CGU_CLK_GATE,
 197                 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
 198                 .gate = { CGU_REG_CLKGR, 0 },
 199         },
 200
 201         [JZ4740_CLK_UART1] = {
 202                 "uart1", CGU_CLK_GATE,
 203                 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
 204                 .gate = { CGU_REG_CLKGR, 15 },
 205         },
 206
 207         [JZ4740_CLK_DMA] = {
 208                 "dma", CGU_CLK_GATE,
 209                 .parents = { JZ4740_CLK_PCLK, -1, -1, -1 },
 210                 .gate = { CGU_REG_CLKGR, 12 },
 211         },
 212
 213         [JZ4740_CLK_IPU] = {
 214                 "ipu", CGU_CLK_GATE,
 215                 .parents = { JZ4740_CLK_PCLK, -1, -1, -1 },
 216                 .gate = { CGU_REG_CLKGR, 13 },
 217         },
 218
 219         [JZ4740_CLK_ADC] = {
 220                 "adc", CGU_CLK_GATE,
 221                 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
 222                 .gate = { CGU_REG_CLKGR, 8 },
 223         },
 224
 225         [JZ4740_CLK_I2C] = {
 226                 "i2c", CGU_CLK_GATE,
 227                 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
 228                 .gate = { CGU_REG_CLKGR, 3 },
 229         },
 230
 231         [JZ4740_CLK_AIC] = {
 232                 "aic", CGU_CLK_GATE,
 233                 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
 234                 .gate = { CGU_REG_CLKGR, 5 },
 235         },
 236
 237         [JZ4740_CLK_TCU] = {
 238                 "tcu", CGU_CLK_GATE,
 239                 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
 240                 .gate = { CGU_REG_CLKGR, 1 },
 241         },
 242 };
 243
 244 static void __init jz4740_cgu_init(struct device_node *np)
 245 {
 246         int retval;
 247
 248         cgu = ingenic_cgu_new(jz4740_cgu_clocks,
 249                               ARRAY_SIZE(jz4740_cgu_clocks), np);
 250         if (!cgu) {
 251                 pr_err("%s: failed to initialise CGU\n", __func__);
 252                 return;
 253         }
 254
 255         retval = ingenic_cgu_register_clocks(cgu);
 256         if (retval)
 257                 pr_err("%s: failed to register CGU Clocks\n", __func__);
 258
 259         ingenic_cgu_register_syscore_ops(cgu);
 260 }
 261 CLK_OF_DECLARE_DRIVER(jz4740_cgu, "ingenic,jz4740-cgu", jz4740_cgu_init);