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