drivers/clk/rockchip/clk_rv1108.c

   1 /*
   2  * (C) Copyright 2016 Rockchip Electronics Co., Ltd
   3  * Author: Andy Yan <andy.yan@rock-chips.com>
   4  * SPDX-License-Identifier:     GPL-2.0
   5  */
   6
   7 #include <common.h>
   8 #include <bitfield.h>
   9 #include <clk-uclass.h>
  10 #include <dm.h>
  11 #include <errno.h>
  12 #include <syscon.h>
  13 #include <asm/io.h>
  14 #include <asm/arch/clock.h>
  15 #include <asm/arch/cru_rv1108.h>
  16 #include <asm/arch/hardware.h>
  17 #include <dm/lists.h>
  18 #include <dt-bindings/clock/rv1108-cru.h>
  19
  20 DECLARE_GLOBAL_DATA_PTR;
  21
  22 enum {
  23         VCO_MAX_HZ      = 2400U * 1000000,
  24         VCO_MIN_HZ      = 600 * 1000000,
  25         OUTPUT_MAX_HZ   = 2400U * 1000000,
  26         OUTPUT_MIN_HZ   = 24 * 1000000,
  27 };
  28
  29 #define DIV_TO_RATE(input_rate, div)    ((input_rate) / ((div) + 1))
  30
  31 #define PLL_DIVISORS(hz, _refdiv, _postdiv1, _postdiv2) {\
  32         .refdiv = _refdiv,\
  33         .fbdiv = (u32)((u64)hz * _refdiv * _postdiv1 * _postdiv2 / OSC_HZ),\
  34         .postdiv1 = _postdiv1, .postdiv2 = _postdiv2};\
  35         _Static_assert(((u64)hz * _refdiv * _postdiv1 * _postdiv2 / OSC_HZ) *\
  36                          OSC_HZ / (_refdiv * _postdiv1 * _postdiv2) == hz,\
  37                          #hz "Hz cannot be hit with PLL "\
  38                          "divisors on line " __stringify(__LINE__));
  39
  40 /* use integer mode */
  41 static inline int rv1108_pll_id(enum rk_clk_id clk_id)
  42 {
  43         int id = 0;
  44
  45         switch (clk_id) {
  46         case CLK_ARM:
  47         case CLK_DDR:
  48                 id = clk_id - 1;
  49                 break;
  50         case CLK_GENERAL:
  51                 id = 2;
  52                 break;
  53         default:
  54                 printf("invalid pll id:%d\n", clk_id);
  55                 id = -1;
  56                 break;
  57         }
  58
  59         return id;
  60 }
  61
  62 static uint32_t rkclk_pll_get_rate(struct rv1108_cru *cru,
  63                                    enum rk_clk_id clk_id)
  64 {
  65         uint32_t refdiv, fbdiv, postdiv1, postdiv2;
  66         uint32_t con0, con1, con3;
  67         int pll_id = rv1108_pll_id(clk_id);
  68         struct rv1108_pll *pll = &cru->pll[pll_id];
  69         uint32_t freq;
  70
  71         con3 = readl(&pll->con3);
  72
  73         if (con3 & WORK_MODE_MASK) {
  74                 con0 = readl(&pll->con0);
  75                 con1 = readl(&pll->con1);
  76                 fbdiv = (con0 >> FBDIV_SHIFT) & FBDIV_MASK;
  77                 postdiv1 = (con1 & POSTDIV1_MASK) >> POSTDIV1_SHIFT;
  78                 postdiv2 = (con1 & POSTDIV2_MASK) >> POSTDIV2_SHIFT;
  79                 refdiv = (con1 & REFDIV_MASK) >> REFDIV_SHIFT;
  80                 freq = (24 * fbdiv / (refdiv * postdiv1 * postdiv2)) * 1000000;
  81         } else {
  82                 freq = OSC_HZ;
  83         }
  84
  85         return freq;
  86 }
  87
  88 static int rv1108_mac_set_clk(struct rv1108_cru *cru, ulong rate)
  89 {
  90         uint32_t con = readl(&cru->clksel_con[24]);
  91         ulong pll_rate;
  92         uint8_t div;
  93
  94         if ((con >> MAC_PLL_SEL_SHIFT) & MAC_PLL_SEL_GPLL)
  95                 pll_rate = rkclk_pll_get_rate(cru, CLK_GENERAL);
  96         else
  97                 pll_rate = rkclk_pll_get_rate(cru, CLK_ARM);
  98
  99         /*default set 50MHZ for gmac*/
 100         if (!rate)
 101                 rate = 50000000;
 102
 103         div = DIV_ROUND_UP(pll_rate, rate) - 1;
 104         if (div <= 0x1f)
 105                 rk_clrsetreg(&cru->clksel_con[24], MAC_CLK_DIV_MASK,
 106                              div << MAC_CLK_DIV_SHIFT);
 107         else
 108                 debug("Unsupported div for gmac:%d\n", div);
 109
 110         return DIV_TO_RATE(pll_rate, div);
 111 }
 112
 113 static int rv1108_sfc_set_clk(struct rv1108_cru *cru, uint rate)
 114 {
 115         u32 con = readl(&cru->clksel_con[27]);
 116         u32 pll_rate;
 117         u32 div;
 118
 119         if ((con >> SFC_PLL_SEL_SHIFT) && SFC_PLL_SEL_GPLL)
 120                 pll_rate = rkclk_pll_get_rate(cru, CLK_GENERAL);
 121         else
 122                 pll_rate = rkclk_pll_get_rate(cru, CLK_DDR);
 123
 124         div = DIV_ROUND_UP(pll_rate, rate) - 1;
 125         if (div <= 0x3f)
 126                 rk_clrsetreg(&cru->clksel_con[27], SFC_CLK_DIV_MASK,
 127                              div << SFC_CLK_DIV_SHIFT);
 128         else
 129                 debug("Unsupported sfc clk rate:%d\n", rate);
 130
 131         return DIV_TO_RATE(pll_rate, div);
 132 }
 133
 134 static ulong rv1108_saradc_get_clk(struct rv1108_cru *cru)
 135 {
 136         u32 div, val;
 137
 138         val = readl(&cru->clksel_con[22]);
 139         div = bitfield_extract(val, CLK_SARADC_DIV_CON_SHIFT,
 140                                CLK_SARADC_DIV_CON_WIDTH);
 141
 142         return DIV_TO_RATE(OSC_HZ, div);
 143 }
 144
 145 static ulong rv1108_saradc_set_clk(struct rv1108_cru *cru, uint hz)
 146 {
 147         int src_clk_div;
 148
 149         src_clk_div = DIV_ROUND_UP(OSC_HZ, hz) - 1;
 150         assert(src_clk_div < 128);
 151
 152         rk_clrsetreg(&cru->clksel_con[22],
 153                      CLK_SARADC_DIV_CON_MASK,
 154                      src_clk_div << CLK_SARADC_DIV_CON_SHIFT);
 155
 156         return rv1108_saradc_get_clk(cru);
 157 }
 158
 159 static ulong rv1108_clk_get_rate(struct clk *clk)
 160 {
 161         struct rv1108_clk_priv *priv = dev_get_priv(clk->dev);
 162
 163         switch (clk->id) {
 164         case 0 ... 63:
 165                 return rkclk_pll_get_rate(priv->cru, clk->id);
 166         case SCLK_SARADC:
 167                 return rv1108_saradc_get_clk(priv->cru);
 168         default:
 169                 return -ENOENT;
 170         }
 171 }
 172
 173 static ulong rv1108_clk_set_rate(struct clk *clk, ulong rate)
 174 {
 175         struct rv1108_clk_priv *priv = dev_get_priv(clk->dev);
 176         ulong new_rate;
 177
 178         switch (clk->id) {
 179         case SCLK_MAC:
 180                 new_rate = rv1108_mac_set_clk(priv->cru, rate);
 181                 break;
 182         case SCLK_SFC:
 183                 new_rate = rv1108_sfc_set_clk(priv->cru, rate);
 184                 break;
 185         case SCLK_SARADC:
 186                 new_rate = rv1108_saradc_set_clk(priv->cru, rate);
 187                 break;
 188         default:
 189                 return -ENOENT;
 190         }
 191
 192         return new_rate;
 193 }
 194
 195 static const struct clk_ops rv1108_clk_ops = {
 196         .get_rate       = rv1108_clk_get_rate,
 197         .set_rate       = rv1108_clk_set_rate,
 198 };
 199
 200 static void rkclk_init(struct rv1108_cru *cru)
 201 {
 202         unsigned int apll = rkclk_pll_get_rate(cru, CLK_ARM);
 203         unsigned int dpll = rkclk_pll_get_rate(cru, CLK_DDR);
 204         unsigned int gpll = rkclk_pll_get_rate(cru, CLK_GENERAL);
 205
 206         rk_clrsetreg(&cru->clksel_con[0], CORE_CLK_DIV_MASK,
 207                      0 << MAC_CLK_DIV_SHIFT);
 208
 209         printf("APLL: %d DPLL:%d GPLL:%d\n", apll, dpll, gpll);
 210 }
 211
 212 static int rv1108_clk_probe(struct udevice *dev)
 213 {
 214         struct rv1108_clk_priv *priv = dev_get_priv(dev);
 215
 216         priv->cru = (struct rv1108_cru *)devfdt_get_addr(dev);
 217
 218         rkclk_init(priv->cru);
 219
 220         return 0;
 221 }
 222
 223 static int rv1108_clk_bind(struct udevice *dev)
 224 {
 225         int ret;
 226
 227         /* The reset driver does not have a device node, so bind it here */
 228         ret = device_bind_driver(gd->dm_root, "rv1108_sysreset", "reset", &dev);
 229         if (ret)
 230                 pr_err("No Rv1108 reset driver: ret=%d\n", ret);
 231
 232         return 0;
 233 }
 234
 235 static const struct udevice_id rv1108_clk_ids[] = {
 236         { .compatible = "rockchip,rv1108-cru" },
 237         { }
 238 };
 239
 240 U_BOOT_DRIVER(clk_rv1108) = {
 241         .name           = "clk_rv1108",
 242         .id             = UCLASS_CLK,
 243         .of_match       = rv1108_clk_ids,
 244         .priv_auto_alloc_size = sizeof(struct rv1108_clk_priv),
 245         .ops            = &rv1108_clk_ops,
 246         .bind           = rv1108_clk_bind,
 247         .probe          = rv1108_clk_probe,
 248 };