arch/arm/mach-sunxi/clock_sun6i.c

   1 /*
   2  * sun6i specific clock code
   3  *
   4  * (C) Copyright 2007-2012
   5  * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
   6  * Tom Cubie <tangliang@allwinnertech.com>
   7  *
   8  * (C) Copyright 2013 Luke Kenneth Casson Leighton <lkcl@lkcl.net>
   9  *
  10  * SPDX-License-Identifier:     GPL-2.0+
  11  */
  12
  13 #include <common.h>
  14 #include <asm/io.h>
  15 #include <asm/arch/clock.h>
  16 #include <asm/arch/prcm.h>
  17 #include <asm/arch/sys_proto.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 #ifdef CONFIG_MACH_SUN8I_R40
  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 #endif
  56
  57 void clock_init_sec(void)
  58 {
  59 #ifdef CONFIG_MACH_SUNXI_H3_H5
  60         struct sunxi_ccm_reg * const ccm =
  61                 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
  62
  63         setbits_le32(&ccm->ccu_sec_switch,
  64                      CCM_SEC_SWITCH_MBUS_NONSEC |
  65                      CCM_SEC_SWITCH_BUS_NONSEC |
  66                      CCM_SEC_SWITCH_PLL_NONSEC);
  67 #endif
  68 }
  69
  70 void clock_init_uart(void)
  71 {
  72 #if CONFIG_CONS_INDEX < 5
  73         struct sunxi_ccm_reg *const ccm =
  74                 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
  75
  76         /* uart clock source is apb2 */
  77         writel(APB2_CLK_SRC_OSC24M|
  78                APB2_CLK_RATE_N_1|
  79                APB2_CLK_RATE_M(1),
  80                &ccm->apb2_div);
  81
  82         /* open the clock for uart */
  83         setbits_le32(&ccm->apb2_gate,
  84                      CLK_GATE_OPEN << (APB2_GATE_UART_SHIFT +
  85                                        CONFIG_CONS_INDEX - 1));
  86
  87         /* deassert uart reset */
  88         setbits_le32(&ccm->apb2_reset_cfg,
  89                      1 << (APB2_RESET_UART_SHIFT +
  90                            CONFIG_CONS_INDEX - 1));
  91 #else
  92         /* enable R_PIO and R_UART clocks, and de-assert resets */
  93         prcm_apb0_enable(PRCM_APB0_GATE_PIO | PRCM_APB0_GATE_UART);
  94 #endif
  95 }
  96
  97 #ifdef CONFIG_SPL_BUILD
  98 void clock_set_pll1(unsigned int clk)
  99 {
 100         struct sunxi_ccm_reg * const ccm =
 101                 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
 102         const int p = 0;
 103         int k = 1;
 104         int m = 1;
 105
 106         if (clk > 1152000000) {
 107                 k = 2;
 108         } else if (clk > 768000000) {
 109                 k = 3;
 110                 m = 2;
 111         }
 112
 113         /* Switch to 24MHz clock while changing PLL1 */
 114         writel(AXI_DIV_3 << AXI_DIV_SHIFT |
 115                ATB_DIV_2 << ATB_DIV_SHIFT |
 116                CPU_CLK_SRC_OSC24M << CPU_CLK_SRC_SHIFT,
 117                &ccm->cpu_axi_cfg);
 118
 119         /*
 120          * sun6i: PLL1 rate = ((24000000 * n * k) >> 0) / m   (p is ignored)
 121          * sun8i: PLL1 rate = ((24000000 * n * k) >> p) / m
 122          */
 123         writel(CCM_PLL1_CTRL_EN | CCM_PLL1_CTRL_P(p) |
 124                CCM_PLL1_CTRL_N(clk / (24000000 * k / m)) |
 125                CCM_PLL1_CTRL_K(k) | CCM_PLL1_CTRL_M(m), &ccm->pll1_cfg);
 126         sdelay(200);
 127
 128         /* Switch CPU to PLL1 */
 129         writel(AXI_DIV_3 << AXI_DIV_SHIFT |
 130                ATB_DIV_2 << ATB_DIV_SHIFT |
 131                CPU_CLK_SRC_PLL1 << CPU_CLK_SRC_SHIFT,
 132                &ccm->cpu_axi_cfg);
 133 }
 134 #endif
 135
 136 void clock_set_pll3(unsigned int clk)
 137 {
 138         struct sunxi_ccm_reg * const ccm =
 139                 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
 140         const int m = 8; /* 3 MHz steps just like sun4i, sun5i and sun7i */
 141
 142         if (clk == 0) {
 143                 clrbits_le32(&ccm->pll3_cfg, CCM_PLL3_CTRL_EN);
 144                 return;
 145         }
 146
 147         /* PLL3 rate = 24000000 * n / m */
 148         writel(CCM_PLL3_CTRL_EN | CCM_PLL3_CTRL_INTEGER_MODE |
 149                CCM_PLL3_CTRL_N(clk / (24000000 / m)) | CCM_PLL3_CTRL_M(m),
 150                &ccm->pll3_cfg);
 151 }
 152
 153 void clock_set_pll5(unsigned int clk, bool sigma_delta_enable)
 154 {
 155         struct sunxi_ccm_reg * const ccm =
 156                 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
 157         const int max_n = 32;
 158         int k = 1, m = 2;
 159
 160 #ifdef CONFIG_MACH_SUNXI_H3_H5
 161         clrsetbits_le32(&ccm->pll5_tuning_cfg, CCM_PLL5_TUN_LOCK_TIME_MASK |
 162                         CCM_PLL5_TUN_INIT_FREQ_MASK,
 163                         CCM_PLL5_TUN_LOCK_TIME(2) | CCM_PLL5_TUN_INIT_FREQ(16));
 164 #endif
 165
 166         if (sigma_delta_enable)
 167                 writel(CCM_PLL5_PATTERN, &ccm->pll5_pattern_cfg);
 168
 169         /* PLL5 rate = 24000000 * n * k / m */
 170         if (clk > 24000000 * k * max_n / m) {
 171                 m = 1;
 172                 if (clk > 24000000 * k * max_n / m)
 173                         k = 2;
 174         }
 175         writel(CCM_PLL5_CTRL_EN |
 176                (sigma_delta_enable ? CCM_PLL5_CTRL_SIGMA_DELTA_EN : 0) |
 177                CCM_PLL5_CTRL_UPD |
 178                CCM_PLL5_CTRL_N(clk / (24000000 * k / m)) |
 179                CCM_PLL5_CTRL_K(k) | CCM_PLL5_CTRL_M(m), &ccm->pll5_cfg);
 180
 181         udelay(5500);
 182 }
 183
 184 #ifdef CONFIG_MACH_SUN6I
 185 void clock_set_mipi_pll(unsigned int clk)
 186 {
 187         struct sunxi_ccm_reg * const ccm =
 188                 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
 189         unsigned int k, m, n, value, diff;
 190         unsigned best_k = 0, best_m = 0, best_n = 0, best_diff = 0xffffffff;
 191         unsigned int src = clock_get_pll3();
 192
 193         /* All calculations are in KHz to avoid overflows */
 194         clk /= 1000;
 195         src /= 1000;
 196
 197         /* Pick the closest lower clock */
 198         for (k = 1; k <= 4; k++) {
 199                 for (m = 1; m <= 16; m++) {
 200                         for (n = 1; n <= 16; n++) {
 201                                 value = src * n * k / m;
 202                                 if (value > clk)
 203                                         continue;
 204
 205                                 diff = clk - value;
 206                                 if (diff < best_diff) {
 207                                         best_diff = diff;
 208                                         best_k = k;
 209                                         best_m = m;
 210                                         best_n = n;
 211                                 }
 212                                 if (diff == 0)
 213                                         goto done;
 214                         }
 215                 }
 216         }
 217
 218 done:
 219         writel(CCM_MIPI_PLL_CTRL_EN | CCM_MIPI_PLL_CTRL_LDO_EN |
 220                CCM_MIPI_PLL_CTRL_N(best_n) | CCM_MIPI_PLL_CTRL_K(best_k) |
 221                CCM_MIPI_PLL_CTRL_M(best_m), &ccm->mipi_pll_cfg);
 222 }
 223 #endif
 224
 225 #if defined(CONFIG_MACH_SUN8I_A33) || \
 226     defined(CONFIG_MACH_SUN8I_R40) || \
 227     defined(CONFIG_MACH_SUN50I)
 228 void clock_set_pll11(unsigned int clk, bool sigma_delta_enable)
 229 {
 230         struct sunxi_ccm_reg * const ccm =
 231                 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
 232
 233         if (sigma_delta_enable)
 234                 writel(CCM_PLL11_PATTERN, &ccm->pll11_pattern_cfg0);
 235
 236         writel(CCM_PLL11_CTRL_EN | CCM_PLL11_CTRL_UPD |
 237                (sigma_delta_enable ? CCM_PLL11_CTRL_SIGMA_DELTA_EN : 0) |
 238                CCM_PLL11_CTRL_N(clk / 24000000), &ccm->pll11_cfg);
 239
 240         while (readl(&ccm->pll11_cfg) & CCM_PLL11_CTRL_UPD)
 241                 ;
 242 }
 243 #endif
 244
 245 unsigned int clock_get_pll3(void)
 246 {
 247         struct sunxi_ccm_reg *const ccm =
 248                 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
 249         uint32_t rval = readl(&ccm->pll3_cfg);
 250         int n = ((rval & CCM_PLL3_CTRL_N_MASK) >> CCM_PLL3_CTRL_N_SHIFT) + 1;
 251         int m = ((rval & CCM_PLL3_CTRL_M_MASK) >> CCM_PLL3_CTRL_M_SHIFT) + 1;
 252
 253         /* Multiply by 1000 after dividing by m to avoid integer overflows */
 254         return (24000 * n / m) * 1000;
 255 }
 256
 257 unsigned int clock_get_pll6(void)
 258 {
 259         struct sunxi_ccm_reg *const ccm =
 260                 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
 261         uint32_t rval = readl(&ccm->pll6_cfg);
 262         int n = ((rval & CCM_PLL6_CTRL_N_MASK) >> CCM_PLL6_CTRL_N_SHIFT) + 1;
 263         int k = ((rval & CCM_PLL6_CTRL_K_MASK) >> CCM_PLL6_CTRL_K_SHIFT) + 1;
 264         return 24000000 * n * k / 2;
 265 }
 266
 267 unsigned int clock_get_mipi_pll(void)
 268 {
 269         struct sunxi_ccm_reg *const ccm =
 270                 (struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
 271         uint32_t rval = readl(&ccm->mipi_pll_cfg);
 272         unsigned int n = ((rval & CCM_MIPI_PLL_CTRL_N_MASK) >> CCM_MIPI_PLL_CTRL_N_SHIFT) + 1;
 273         unsigned int k = ((rval & CCM_MIPI_PLL_CTRL_K_MASK) >> CCM_MIPI_PLL_CTRL_K_SHIFT) + 1;
 274         unsigned int m = ((rval & CCM_MIPI_PLL_CTRL_M_MASK) >> CCM_MIPI_PLL_CTRL_M_SHIFT) + 1;
 275         unsigned int src = clock_get_pll3();
 276
 277         /* Multiply by 1000 after dividing by m to avoid integer overflows */
 278         return ((src / 1000) * n * k / m) * 1000;
 279 }
 280
 281 void clock_set_de_mod_clock(u32 *clk_cfg, unsigned int hz)
 282 {
 283         int pll = clock_get_pll6() * 2;
 284         int div = 1;
 285
 286         while ((pll / div) > hz)
 287                 div++;
 288
 289         writel(CCM_DE_CTRL_GATE | CCM_DE_CTRL_PLL6_2X | CCM_DE_CTRL_M(div),
 290                clk_cfg);
 291 }