arch/arm/mach-sunxi/clock_sun6i.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * sun6i specific clock code
   4  *
   5  * (C) Copyright 2007-2012
   6  * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
   7  * Tom Cubie <tangliang@allwinnertech.com>
   8  *
   9  * (C) Copyright 2013 Luke Kenneth Casson Leighton <lkcl@lkcl.net>
  10  */
  11
  12 #include <common.h>
  13 #include <asm/io.h>
  14 #include <asm/arch/clock.h>
  15 #include <asm/arch/prcm.h>
  16 #include <asm/arch/sys_proto.h>
  17 #include <linux/delay.h>
  18
  19 #ifdef CONFIG_SPL_BUILD
  20 void clock_init_safe(void)
  21 {
  22         struct sunxi_ccm_reg * const ccm =
  23                 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
  24
  25 #if !defined(CONFIG_MACH_SUNXI_H3_H5) && !defined(CONFIG_MACH_SUN50I)
  26         struct sunxi_prcm_reg * const prcm =
  27                 (struct sunxi_prcm_reg *)SUNXI_PRCM_BASE;
  28
  29         /* Set PLL ldo voltage without this PLL6 does not work properly */
  30         clrsetbits_le32(&prcm->pll_ctrl1, PRCM_PLL_CTRL_LDO_KEY_MASK,
  31                         PRCM_PLL_CTRL_LDO_KEY);
  32         clrsetbits_le32(&prcm->pll_ctrl1, ~PRCM_PLL_CTRL_LDO_KEY_MASK,
  33                 PRCM_PLL_CTRL_LDO_DIGITAL_EN | PRCM_PLL_CTRL_LDO_ANALOG_EN |
  34                 PRCM_PLL_CTRL_EXT_OSC_EN | PRCM_PLL_CTRL_LDO_OUT_L(1140));
  35         clrbits_le32(&prcm->pll_ctrl1, PRCM_PLL_CTRL_LDO_KEY_MASK);
  36 #endif
  37
  38 #if defined(CONFIG_MACH_SUN8I_R40) || defined(CONFIG_MACH_SUN50I)
  39         /* Set PLL lock enable bits and switch to old lock mode */
  40         writel(GENMASK(12, 0), &ccm->pll_lock_ctrl);
  41 #endif
  42
  43         clock_set_pll1(408000000);
  44
  45         writel(PLL6_CFG_DEFAULT, &ccm->pll6_cfg);
  46         while (!(readl(&ccm->pll6_cfg) & CCM_PLL6_CTRL_LOCK))
  47                 ;
  48
  49         writel(AHB1_ABP1_DIV_DEFAULT, &ccm->ahb1_apb1_div);
  50
  51         writel(MBUS_CLK_DEFAULT, &ccm->mbus0_clk_cfg);
  52         if (IS_ENABLED(CONFIG_MACH_SUN6I))
  53                 writel(MBUS_CLK_DEFAULT, &ccm->mbus1_clk_cfg);
  54
  55 #if defined(CONFIG_MACH_SUN8I_R40) && defined(CONFIG_SUNXI_AHCI)
  56         setbits_le32(&ccm->sata_pll_cfg, CCM_SATA_PLL_DEFAULT);
  57         setbits_le32(&ccm->ahb_reset0_cfg, 0x1 << AHB_GATE_OFFSET_SATA);
  58         setbits_le32(&ccm->ahb_gate0, 0x1 << AHB_GATE_OFFSET_SATA);
  59         setbits_le32(&ccm->sata_clk_cfg, CCM_SATA_CTRL_ENABLE);
  60 #endif
  61 }
  62 #endif
  63
  64 void clock_init_sec(void)
  65 {
  66 #ifdef CONFIG_MACH_SUNXI_H3_H5
  67         struct sunxi_ccm_reg * const ccm =
  68                 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
  69         struct sunxi_prcm_reg * const prcm =
  70                 (struct sunxi_prcm_reg *)SUNXI_PRCM_BASE;
  71
  72         setbits_le32(&ccm->ccu_sec_switch,
  73                      CCM_SEC_SWITCH_MBUS_NONSEC |
  74                      CCM_SEC_SWITCH_BUS_NONSEC |
  75                      CCM_SEC_SWITCH_PLL_NONSEC);
  76         setbits_le32(&prcm->prcm_sec_switch,
  77                      PRCM_SEC_SWITCH_APB0_CLK_NONSEC |
  78                      PRCM_SEC_SWITCH_PLL_CFG_NONSEC |
  79                      PRCM_SEC_SWITCH_PWR_GATE_NONSEC);
  80 #endif
  81 }
  82
  83 void clock_init_uart(void)
  84 {
  85 #if CONFIG_CONS_INDEX < 5
  86         struct sunxi_ccm_reg *const ccm =
  87                 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
  88
  89         /* uart clock source is apb2 */
  90         writel(APB2_CLK_SRC_OSC24M|
  91                APB2_CLK_RATE_N_1|
  92                APB2_CLK_RATE_M(1),
  93                &ccm->apb2_div);
  94
  95         /* open the clock for uart */
  96         setbits_le32(&ccm->apb2_gate,
  97                      CLK_GATE_OPEN << (APB2_GATE_UART_SHIFT +
  98                                        CONFIG_CONS_INDEX - 1));
  99
 100         /* deassert uart reset */
 101         setbits_le32(&ccm->apb2_reset_cfg,
 102                      1 << (APB2_RESET_UART_SHIFT +
 103                            CONFIG_CONS_INDEX - 1));
 104 #else
 105         /* enable R_PIO and R_UART clocks, and de-assert resets */
 106         prcm_apb0_enable(PRCM_APB0_GATE_PIO | PRCM_APB0_GATE_UART);
 107 #endif
 108 }
 109
 110 #ifdef CONFIG_SPL_BUILD
 111 void clock_set_pll1(unsigned int clk)
 112 {
 113         struct sunxi_ccm_reg * const ccm =
 114                 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
 115         const int p = 0;
 116         int k = 1;
 117         int m = 1;
 118
 119         if (clk > 1152000000) {
 120                 k = 2;
 121         } else if (clk > 768000000) {
 122                 k = 4;
 123                 m = 2;
 124         }
 125
 126         /* Switch to 24MHz clock while changing PLL1 */
 127         writel(AXI_DIV_3 << AXI_DIV_SHIFT |
 128                ATB_DIV_2 << ATB_DIV_SHIFT |
 129                CPU_CLK_SRC_OSC24M << CPU_CLK_SRC_SHIFT,
 130                &ccm->cpu_axi_cfg);
 131
 132         /*
 133          * sun6i: PLL1 rate = ((24000000 * n * k) >> 0) / m   (p is ignored)
 134          * sun8i: PLL1 rate = ((24000000 * n * k) >> p) / m
 135          */
 136         writel(CCM_PLL1_CTRL_EN | CCM_PLL1_CTRL_P(p) |
 137                CCM_PLL1_CTRL_N(clk / (24000000 * k / m)) |
 138                CCM_PLL1_CTRL_K(k) | CCM_PLL1_CTRL_M(m), &ccm->pll1_cfg);
 139         sdelay(200);
 140
 141         /* Switch CPU to PLL1 */
 142         writel(AXI_DIV_3 << AXI_DIV_SHIFT |
 143                ATB_DIV_2 << ATB_DIV_SHIFT |
 144                CPU_CLK_SRC_PLL1 << CPU_CLK_SRC_SHIFT,
 145                &ccm->cpu_axi_cfg);
 146 }
 147 #endif
 148
 149 void clock_set_pll3(unsigned int clk)
 150 {
 151         struct sunxi_ccm_reg * const ccm =
 152                 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
 153 #ifdef CONFIG_SUNXI_DE2
 154         const int m = 4; /* 6 MHz steps to allow higher frequency for DE2 */
 155 #else
 156         const int m = 8; /* 3 MHz steps just like sun4i, sun5i and sun7i */
 157 #endif
 158
 159         if (clk == 0) {
 160                 clrbits_le32(&ccm->pll3_cfg, CCM_PLL3_CTRL_EN);
 161                 return;
 162         }
 163
 164         /* PLL3 rate = 24000000 * n / m */
 165         writel(CCM_PLL3_CTRL_EN | CCM_PLL3_CTRL_INTEGER_MODE |
 166                CCM_PLL3_CTRL_N(clk / (24000000 / m)) | CCM_PLL3_CTRL_M(m),
 167                &ccm->pll3_cfg);
 168 }
 169
 170 #ifdef CONFIG_SUNXI_DE2
 171 void clock_set_pll3_factors(int m, int n)
 172 {
 173         struct sunxi_ccm_reg * const ccm =
 174                 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
 175
 176         /* PLL3 rate = 24000000 * n / m */
 177         writel(CCM_PLL3_CTRL_EN | CCM_PLL3_CTRL_INTEGER_MODE |
 178                CCM_PLL3_CTRL_N(n) | CCM_PLL3_CTRL_M(m),
 179                &ccm->pll3_cfg);
 180
 181         while (!(readl(&ccm->pll3_cfg) & CCM_PLL3_CTRL_LOCK))
 182                 ;
 183 }
 184 #endif
 185
 186 void clock_set_pll5(unsigned int clk, bool sigma_delta_enable)
 187 {
 188         struct sunxi_ccm_reg * const ccm =
 189                 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
 190         const int max_n = 32;
 191         int k = 1, m = 2;
 192
 193 #ifdef CONFIG_MACH_SUNXI_H3_H5
 194         clrsetbits_le32(&ccm->pll5_tuning_cfg, CCM_PLL5_TUN_LOCK_TIME_MASK |
 195                         CCM_PLL5_TUN_INIT_FREQ_MASK,
 196                         CCM_PLL5_TUN_LOCK_TIME(2) | CCM_PLL5_TUN_INIT_FREQ(16));
 197 #endif
 198
 199         if (sigma_delta_enable)
 200                 writel(CCM_PLL5_PATTERN, &ccm->pll5_pattern_cfg);
 201
 202         /* PLL5 rate = 24000000 * n * k / m */
 203         if (clk > 24000000 * k * max_n / m) {
 204                 m = 1;
 205                 if (clk > 24000000 * k * max_n / m)
 206                         k = 2;
 207         }
 208         writel(CCM_PLL5_CTRL_EN |
 209                (sigma_delta_enable ? CCM_PLL5_CTRL_SIGMA_DELTA_EN : 0) |
 210                CCM_PLL5_CTRL_UPD |
 211                CCM_PLL5_CTRL_N(clk / (24000000 * k / m)) |
 212                CCM_PLL5_CTRL_K(k) | CCM_PLL5_CTRL_M(m), &ccm->pll5_cfg);
 213
 214         udelay(5500);
 215 }
 216
 217 #ifdef CONFIG_MACH_SUN6I
 218 void clock_set_mipi_pll(unsigned int clk)
 219 {
 220         struct sunxi_ccm_reg * const ccm =
 221                 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
 222         unsigned int k, m, n, value, diff;
 223         unsigned best_k = 0, best_m = 0, best_n = 0, best_diff = 0xffffffff;
 224         unsigned int src = clock_get_pll3();
 225
 226         /* All calculations are in KHz to avoid overflows */
 227         clk /= 1000;
 228         src /= 1000;
 229
 230         /* Pick the closest lower clock */
 231         for (k = 1; k <= 4; k++) {
 232                 for (m = 1; m <= 16; m++) {
 233                         for (n = 1; n <= 16; n++) {
 234                                 value = src * n * k / m;
 235                                 if (value > clk)
 236                                         continue;
 237
 238                                 diff = clk - value;
 239                                 if (diff < best_diff) {
 240                                         best_diff = diff;
 241                                         best_k = k;
 242                                         best_m = m;
 243                                         best_n = n;
 244                                 }
 245                                 if (diff == 0)
 246                                         goto done;
 247                         }
 248                 }
 249         }
 250
 251 done:
 252         writel(CCM_MIPI_PLL_CTRL_EN | CCM_MIPI_PLL_CTRL_LDO_EN |
 253                CCM_MIPI_PLL_CTRL_N(best_n) | CCM_MIPI_PLL_CTRL_K(best_k) |
 254                CCM_MIPI_PLL_CTRL_M(best_m), &ccm->mipi_pll_cfg);
 255 }
 256 #endif
 257
 258 #ifdef CONFIG_SUNXI_DE2
 259 void clock_set_pll10(unsigned int clk)
 260 {
 261         struct sunxi_ccm_reg * const ccm =
 262                 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
 263         const int m = 2; /* 12 MHz steps */
 264
 265         if (clk == 0) {
 266                 clrbits_le32(&ccm->pll10_cfg, CCM_PLL10_CTRL_EN);
 267                 return;
 268         }
 269
 270         /* PLL10 rate = 24000000 * n / m */
 271         writel(CCM_PLL10_CTRL_EN | CCM_PLL10_CTRL_INTEGER_MODE |
 272                CCM_PLL10_CTRL_N(clk / (24000000 / m)) | CCM_PLL10_CTRL_M(m),
 273                &ccm->pll10_cfg);
 274
 275         while (!(readl(&ccm->pll10_cfg) & CCM_PLL10_CTRL_LOCK))
 276                 ;
 277 }
 278 #endif
 279
 280 #if defined(CONFIG_MACH_SUN8I_A33) || \
 281     defined(CONFIG_MACH_SUN8I_R40) || \
 282     defined(CONFIG_MACH_SUN50I)
 283 void clock_set_pll11(unsigned int clk, bool sigma_delta_enable)
 284 {
 285         struct sunxi_ccm_reg * const ccm =
 286                 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
 287
 288         if (sigma_delta_enable)
 289                 writel(CCM_PLL11_PATTERN, &ccm->pll11_pattern_cfg0);
 290
 291         writel(CCM_PLL11_CTRL_EN | CCM_PLL11_CTRL_UPD |
 292                (sigma_delta_enable ? CCM_PLL11_CTRL_SIGMA_DELTA_EN : 0) |
 293                CCM_PLL11_CTRL_N(clk / 24000000), &ccm->pll11_cfg);
 294
 295         while (readl(&ccm->pll11_cfg) & CCM_PLL11_CTRL_UPD)
 296                 ;
 297 }
 298 #endif
 299
 300 unsigned int clock_get_pll3(void)
 301 {
 302         struct sunxi_ccm_reg *const ccm =
 303                 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
 304         uint32_t rval = readl(&ccm->pll3_cfg);
 305         int n = ((rval & CCM_PLL3_CTRL_N_MASK) >> CCM_PLL3_CTRL_N_SHIFT) + 1;
 306         int m = ((rval & CCM_PLL3_CTRL_M_MASK) >> CCM_PLL3_CTRL_M_SHIFT) + 1;
 307
 308         /* Multiply by 1000 after dividing by m to avoid integer overflows */
 309         return (24000 * n / m) * 1000;
 310 }
 311
 312 unsigned int clock_get_pll6(void)
 313 {
 314         struct sunxi_ccm_reg *const ccm =
 315                 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
 316         uint32_t rval = readl(&ccm->pll6_cfg);
 317         int n = ((rval & CCM_PLL6_CTRL_N_MASK) >> CCM_PLL6_CTRL_N_SHIFT) + 1;
 318         int k = ((rval & CCM_PLL6_CTRL_K_MASK) >> CCM_PLL6_CTRL_K_SHIFT) + 1;
 319         return 24000000 * n * k / 2;
 320 }
 321
 322 unsigned int clock_get_mipi_pll(void)
 323 {
 324         struct sunxi_ccm_reg *const ccm =
 325                 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
 326         uint32_t rval = readl(&ccm->mipi_pll_cfg);
 327         unsigned int n = ((rval & CCM_MIPI_PLL_CTRL_N_MASK) >> CCM_MIPI_PLL_CTRL_N_SHIFT) + 1;
 328         unsigned int k = ((rval & CCM_MIPI_PLL_CTRL_K_MASK) >> CCM_MIPI_PLL_CTRL_K_SHIFT) + 1;
 329         unsigned int m = ((rval & CCM_MIPI_PLL_CTRL_M_MASK) >> CCM_MIPI_PLL_CTRL_M_SHIFT) + 1;
 330         unsigned int src = clock_get_pll3();
 331
 332         /* Multiply by 1000 after dividing by m to avoid integer overflows */
 333         return ((src / 1000) * n * k / m) * 1000;
 334 }
 335
 336 void clock_set_de_mod_clock(u32 *clk_cfg, unsigned int hz)
 337 {
 338         int pll = clock_get_pll6() * 2;
 339         int div = 1;
 340
 341         while ((pll / div) > hz)
 342                 div++;
 343
 344         writel(CCM_DE_CTRL_GATE | CCM_DE_CTRL_PLL6_2X | CCM_DE_CTRL_M(div),
 345                clk_cfg);
 346 }