drivers/clk/ingenic/jz4740-cgu.c

   1 /*
   2  * Ingenic JZ4740 SoC CGU driver
   3  *
   4  * Copyright (c) 2015 Imagination Technologies
   5  * Author: Paul Burton <paul.burton@mips.com>
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License as
   9  * published by the Free Software Foundation; either version 2 of
  10  * the License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  */
  17
  18 #include <linux/clk-provider.h>
  19 #include <linux/delay.h>
  20 #include <linux/of.h>
  21 #include <dt-bindings/clock/jz4740-cgu.h>
  22 #include <asm/mach-jz4740/clock.h>
  23 #include "cgu.h"
  24
  25 /* CGU register offsets */
  26 #define CGU_REG_CPCCR           0x00
  27 #define CGU_REG_LCR             0x04
  28 #define CGU_REG_CPPCR           0x10
  29 #define CGU_REG_CLKGR           0x20
  30 #define CGU_REG_SCR             0x24
  31 #define CGU_REG_I2SCDR          0x60
  32 #define CGU_REG_LPCDR           0x64
  33 #define CGU_REG_MSCCDR          0x68
  34 #define CGU_REG_UHCCDR          0x6c
  35 #define CGU_REG_SSICDR          0x74
  36
  37 /* bits within a PLL control register */
  38 #define PLLCTL_M_SHIFT          23
  39 #define PLLCTL_M_MASK           (0x1ff << PLLCTL_M_SHIFT)
  40 #define PLLCTL_N_SHIFT          18
  41 #define PLLCTL_N_MASK           (0x1f << PLLCTL_N_SHIFT)
  42 #define PLLCTL_OD_SHIFT         16
  43 #define PLLCTL_OD_MASK          (0x3 << PLLCTL_OD_SHIFT)
  44 #define PLLCTL_STABLE           (1 << 10)
  45 #define PLLCTL_BYPASS           (1 << 9)
  46 #define PLLCTL_ENABLE           (1 << 8)
  47
  48 /* bits within the LCR register */
  49 #define LCR_SLEEP               (1 << 0)
  50
  51 /* bits within the CLKGR register */
  52 #define CLKGR_UDC               (1 << 11)
  53
  54 static struct ingenic_cgu *cgu;
  55
  56 static const s8 pll_od_encoding[4] = {
  57         0x0, 0x1, -1, 0x3,
  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 = { CGU_REG_CPCCR, 21, 1, 1, -1, -1, -1 },
  94         },
  95
  96         [JZ4740_CLK_CCLK] = {
  97                 "cclk", CGU_CLK_DIV,
  98                 .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
  99                 .div = { CGU_REG_CPCCR, 0, 1, 4, 22, -1, -1 },
 100         },
 101
 102         [JZ4740_CLK_HCLK] = {
 103                 "hclk", CGU_CLK_DIV,
 104                 .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
 105                 .div = { CGU_REG_CPCCR, 4, 1, 4, 22, -1, -1 },
 106         },
 107
 108         [JZ4740_CLK_PCLK] = {
 109                 "pclk", CGU_CLK_DIV,
 110                 .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
 111                 .div = { CGU_REG_CPCCR, 8, 1, 4, 22, -1, -1 },
 112         },
 113
 114         [JZ4740_CLK_MCLK] = {
 115                 "mclk", CGU_CLK_DIV,
 116                 .parents = { JZ4740_CLK_PLL, -1, -1, -1 },
 117                 .div = { CGU_REG_CPCCR, 12, 1, 4, 22, -1, -1 },
 118         },
 119
 120         [JZ4740_CLK_LCD] = {
 121                 "lcd", CGU_CLK_DIV | CGU_CLK_GATE,
 122                 .parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
 123                 .div = { CGU_REG_CPCCR, 16, 1, 5, 22, -1, -1 },
 124                 .gate = { CGU_REG_CLKGR, 10 },
 125         },
 126
 127         [JZ4740_CLK_LCD_PCLK] = {
 128                 "lcd_pclk", CGU_CLK_DIV,
 129                 .parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
 130                 .div = { CGU_REG_LPCDR, 0, 1, 11, -1, -1, -1 },
 131         },
 132
 133         [JZ4740_CLK_I2S] = {
 134                 "i2s", CGU_CLK_MUX | CGU_CLK_DIV | CGU_CLK_GATE,
 135                 .parents = { JZ4740_CLK_EXT, JZ4740_CLK_PLL_HALF, -1, -1 },
 136                 .mux = { CGU_REG_CPCCR, 31, 1 },
 137                 .div = { CGU_REG_I2SCDR, 0, 1, 9, -1, -1, -1 },
 138                 .gate = { CGU_REG_CLKGR, 6 },
 139         },
 140
 141         [JZ4740_CLK_SPI] = {
 142                 "spi", CGU_CLK_MUX | CGU_CLK_DIV | CGU_CLK_GATE,
 143                 .parents = { JZ4740_CLK_EXT, JZ4740_CLK_PLL, -1, -1 },
 144                 .mux = { CGU_REG_SSICDR, 31, 1 },
 145                 .div = { CGU_REG_SSICDR, 0, 1, 4, -1, -1, -1 },
 146                 .gate = { CGU_REG_CLKGR, 4 },
 147         },
 148
 149         [JZ4740_CLK_MMC] = {
 150                 "mmc", CGU_CLK_DIV | CGU_CLK_GATE,
 151                 .parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
 152                 .div = { CGU_REG_MSCCDR, 0, 1, 5, -1, -1, -1 },
 153                 .gate = { CGU_REG_CLKGR, 7 },
 154         },
 155
 156         [JZ4740_CLK_UHC] = {
 157                 "uhc", CGU_CLK_DIV | CGU_CLK_GATE,
 158                 .parents = { JZ4740_CLK_PLL_HALF, -1, -1, -1 },
 159                 .div = { CGU_REG_UHCCDR, 0, 1, 4, -1, -1, -1 },
 160                 .gate = { CGU_REG_CLKGR, 14 },
 161         },
 162
 163         [JZ4740_CLK_UDC] = {
 164                 "udc", CGU_CLK_MUX | CGU_CLK_DIV | CGU_CLK_GATE,
 165                 .parents = { JZ4740_CLK_EXT, JZ4740_CLK_PLL_HALF, -1, -1 },
 166                 .mux = { CGU_REG_CPCCR, 29, 1 },
 167                 .div = { CGU_REG_CPCCR, 23, 1, 6, -1, -1, -1 },
 168                 .gate = { CGU_REG_SCR, 6 },
 169         },
 170
 171         /* Gate-only clocks */
 172
 173         [JZ4740_CLK_UART0] = {
 174                 "uart0", CGU_CLK_GATE,
 175                 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
 176                 .gate = { CGU_REG_CLKGR, 0 },
 177         },
 178
 179         [JZ4740_CLK_UART1] = {
 180                 "uart1", CGU_CLK_GATE,
 181                 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
 182                 .gate = { CGU_REG_CLKGR, 15 },
 183         },
 184
 185         [JZ4740_CLK_DMA] = {
 186                 "dma", CGU_CLK_GATE,
 187                 .parents = { JZ4740_CLK_PCLK, -1, -1, -1 },
 188                 .gate = { CGU_REG_CLKGR, 12 },
 189         },
 190
 191         [JZ4740_CLK_IPU] = {
 192                 "ipu", CGU_CLK_GATE,
 193                 .parents = { JZ4740_CLK_PCLK, -1, -1, -1 },
 194                 .gate = { CGU_REG_CLKGR, 13 },
 195         },
 196
 197         [JZ4740_CLK_ADC] = {
 198                 "adc", CGU_CLK_GATE,
 199                 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
 200                 .gate = { CGU_REG_CLKGR, 8 },
 201         },
 202
 203         [JZ4740_CLK_I2C] = {
 204                 "i2c", CGU_CLK_GATE,
 205                 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
 206                 .gate = { CGU_REG_CLKGR, 3 },
 207         },
 208
 209         [JZ4740_CLK_AIC] = {
 210                 "aic", CGU_CLK_GATE,
 211                 .parents = { JZ4740_CLK_EXT, -1, -1, -1 },
 212                 .gate = { CGU_REG_CLKGR, 5 },
 213         },
 214 };
 215
 216 static void __init jz4740_cgu_init(struct device_node *np)
 217 {
 218         int retval;
 219
 220         cgu = ingenic_cgu_new(jz4740_cgu_clocks,
 221                               ARRAY_SIZE(jz4740_cgu_clocks), np);
 222         if (!cgu) {
 223                 pr_err("%s: failed to initialise CGU\n", __func__);
 224                 return;
 225         }
 226
 227         retval = ingenic_cgu_register_clocks(cgu);
 228         if (retval)
 229                 pr_err("%s: failed to register CGU Clocks\n", __func__);
 230 }
 231 CLK_OF_DECLARE(jz4740_cgu, "ingenic,jz4740-cgu", jz4740_cgu_init);
 232
 233 void jz4740_clock_set_wait_mode(enum jz4740_wait_mode mode)
 234 {
 235         uint32_t lcr = readl(cgu->base + CGU_REG_LCR);
 236
 237         switch (mode) {
 238         case JZ4740_WAIT_MODE_IDLE:
 239                 lcr &= ~LCR_SLEEP;
 240                 break;
 241
 242         case JZ4740_WAIT_MODE_SLEEP:
 243                 lcr |= LCR_SLEEP;
 244                 break;
 245         }
 246
 247         writel(lcr, cgu->base + CGU_REG_LCR);
 248 }
 249
 250 void jz4740_clock_udc_disable_auto_suspend(void)
 251 {
 252         uint32_t clkgr = readl(cgu->base + CGU_REG_CLKGR);
 253
 254         clkgr &= ~CLKGR_UDC;
 255         writel(clkgr, cgu->base + CGU_REG_CLKGR);
 256 }
 257 EXPORT_SYMBOL_GPL(jz4740_clock_udc_disable_auto_suspend);
 258
 259 void jz4740_clock_udc_enable_auto_suspend(void)
 260 {
 261         uint32_t clkgr = readl(cgu->base + CGU_REG_CLKGR);
 262
 263         clkgr |= CLKGR_UDC;
 264         writel(clkgr, cgu->base + CGU_REG_CLKGR);
 265 }
 266 EXPORT_SYMBOL_GPL(jz4740_clock_udc_enable_auto_suspend);
 267
 268 #define JZ_CLOCK_GATE_UART0     BIT(0)
 269 #define JZ_CLOCK_GATE_TCU       BIT(1)
 270 #define JZ_CLOCK_GATE_DMAC      BIT(12)
 271
 272 void jz4740_clock_suspend(void)
 273 {
 274         uint32_t clkgr, cppcr;
 275
 276         clkgr = readl(cgu->base + CGU_REG_CLKGR);
 277         clkgr |= JZ_CLOCK_GATE_TCU | JZ_CLOCK_GATE_DMAC | JZ_CLOCK_GATE_UART0;
 278         writel(clkgr, cgu->base + CGU_REG_CLKGR);
 279
 280         cppcr = readl(cgu->base + CGU_REG_CPPCR);
 281         cppcr &= ~BIT(jz4740_cgu_clocks[JZ4740_CLK_PLL].pll.enable_bit);
 282         writel(cppcr, cgu->base + CGU_REG_CPPCR);
 283 }
 284
 285 void jz4740_clock_resume(void)
 286 {
 287         uint32_t clkgr, cppcr, stable;
 288
 289         cppcr = readl(cgu->base + CGU_REG_CPPCR);
 290         cppcr |= BIT(jz4740_cgu_clocks[JZ4740_CLK_PLL].pll.enable_bit);
 291         writel(cppcr, cgu->base + CGU_REG_CPPCR);
 292
 293         stable = BIT(jz4740_cgu_clocks[JZ4740_CLK_PLL].pll.stable_bit);
 294         do {
 295                 cppcr = readl(cgu->base + CGU_REG_CPPCR);
 296         } while (!(cppcr & stable));
 297
 298         clkgr = readl(cgu->base + CGU_REG_CLKGR);
 299         clkgr &= ~JZ_CLOCK_GATE_TCU;
 300         clkgr &= ~JZ_CLOCK_GATE_DMAC;
 301         clkgr &= ~JZ_CLOCK_GATE_UART0;
 302         writel(clkgr, cgu->base + CGU_REG_CLKGR);
 303 }