drivers/clk/mvebu/mv98dx3236.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Marvell MV98DX3236 SoC clocks
   4  *
   5  * Copyright (C) 2012 Marvell
   6  *
   7  * Gregory CLEMENT <gregory.clement@free-electrons.com>
   8  * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
   9  * Andrew Lunn <andrew@lunn.ch>
  10  *
  11  */
  12
  13 #include <linux/kernel.h>
  14 #include <linux/clk-provider.h>
  15 #include <linux/io.h>
  16 #include <linux/of.h>
  17 #include "common.h"
  18
  19
  20 /*
  21  * For 98DX4251 Sample At Reset the CPU, DDR and Main PLL clocks are all
  22  * defined at the same time
  23  *
  24  * SAR1[20:18]   : CPU frequency    DDR frequency   MPLL frequency
  25  *               0  =  400 MHz      400 MHz         800 MHz
  26  *               2  =  667 MHz      667 MHz         2000 MHz
  27  *               3  =  800 MHz      800 MHz         1600 MHz
  28  *               others reserved.
  29  *
  30  * For 98DX3236 Sample At Reset the CPU, DDR and Main PLL clocks are all
  31  * defined at the same time
  32  *
  33  * SAR1[20:18]   : CPU frequency    DDR frequency   MPLL frequency
  34  *               1  =  667 MHz      667 MHz         2000 MHz
  35  *               2  =  400 MHz      400 MHz         400 MHz
  36  *               3  =  800 MHz      800 MHz         800 MHz
  37  *               5  =  800 MHz      400 MHz         800 MHz
  38  *               others reserved.
  39  */
  40
  41 #define SAR1_MV98DX3236_CPU_DDR_MPLL_FREQ_OPT           18
  42 #define SAR1_MV98DX3236_CPU_DDR_MPLL_FREQ_OPT_MASK      0x7
  43
  44 static u32 __init mv98dx3236_get_tclk_freq(void __iomem *sar)
  45 {
  46         /* Tclk = 200MHz, no SaR dependency */
  47         return 200000000;
  48 }
  49
  50 static const u32 mv98dx3236_cpu_frequencies[] __initconst = {
  51         0,
  52         667000000,
  53         400000000,
  54         800000000,
  55         0,
  56         800000000,
  57         0, 0,
  58 };
  59
  60 static const u32 mv98dx4251_cpu_frequencies[] __initconst = {
  61         400000000,
  62         0,
  63         667000000,
  64         800000000,
  65         0, 0, 0, 0,
  66 };
  67
  68 static u32 __init mv98dx3236_get_cpu_freq(void __iomem *sar)
  69 {
  70         u32 cpu_freq = 0;
  71         u8 cpu_freq_select = 0;
  72
  73         cpu_freq_select = ((readl(sar) >> SAR1_MV98DX3236_CPU_DDR_MPLL_FREQ_OPT) &
  74                            SAR1_MV98DX3236_CPU_DDR_MPLL_FREQ_OPT_MASK);
  75
  76         if (of_machine_is_compatible("marvell,armadaxp-98dx4251"))
  77                 cpu_freq = mv98dx4251_cpu_frequencies[cpu_freq_select];
  78         else if (of_machine_is_compatible("marvell,armadaxp-98dx3236"))
  79                 cpu_freq = mv98dx3236_cpu_frequencies[cpu_freq_select];
  80
  81         if (!cpu_freq)
  82                 pr_err("CPU freq select unsupported %d\n", cpu_freq_select);
  83
  84         return cpu_freq;
  85 }
  86
  87 enum {
  88         MV98DX3236_CPU_TO_DDR,
  89         MV98DX3236_CPU_TO_MPLL
  90 };
  91
  92 static const struct coreclk_ratio mv98dx3236_core_ratios[] __initconst = {
  93         { .id = MV98DX3236_CPU_TO_DDR, .name = "ddrclk" },
  94         { .id = MV98DX3236_CPU_TO_MPLL, .name = "mpll" },
  95 };
  96
  97 static const int __initconst mv98dx3236_cpu_mpll_ratios[8][2] = {
  98         {0, 1}, {3, 1}, {1, 1}, {1, 1},
  99         {0, 1}, {1, 1}, {0, 1}, {0, 1},
 100 };
 101
 102 static const int __initconst mv98dx3236_cpu_ddr_ratios[8][2] = {
 103         {0, 1}, {1, 1}, {1, 1}, {1, 1},
 104         {0, 1}, {1, 2}, {0, 1}, {0, 1},
 105 };
 106
 107 static const int __initconst mv98dx4251_cpu_mpll_ratios[8][2] = {
 108         {2, 1}, {0, 1}, {3, 1}, {2, 1},
 109         {0, 1}, {0, 1}, {0, 1}, {0, 1},
 110 };
 111
 112 static const int __initconst mv98dx4251_cpu_ddr_ratios[8][2] = {
 113         {1, 1}, {0, 1}, {1, 1}, {1, 1},
 114         {0, 1}, {0, 1}, {0, 1}, {0, 1},
 115 };
 116
 117 static void __init mv98dx3236_get_clk_ratio(
 118         void __iomem *sar, int id, int *mult, int *div)
 119 {
 120         u32 opt = ((readl(sar) >> SAR1_MV98DX3236_CPU_DDR_MPLL_FREQ_OPT) &
 121                 SAR1_MV98DX3236_CPU_DDR_MPLL_FREQ_OPT_MASK);
 122
 123         switch (id) {
 124         case MV98DX3236_CPU_TO_DDR:
 125                 if (of_machine_is_compatible("marvell,armadaxp-98dx4251")) {
 126                         *mult = mv98dx4251_cpu_ddr_ratios[opt][0];
 127                         *div = mv98dx4251_cpu_ddr_ratios[opt][1];
 128                 } else if (of_machine_is_compatible("marvell,armadaxp-98dx3236")) {
 129                         *mult = mv98dx3236_cpu_ddr_ratios[opt][0];
 130                         *div = mv98dx3236_cpu_ddr_ratios[opt][1];
 131                 }
 132                 break;
 133         case MV98DX3236_CPU_TO_MPLL:
 134                 if (of_machine_is_compatible("marvell,armadaxp-98dx4251")) {
 135                         *mult = mv98dx4251_cpu_mpll_ratios[opt][0];
 136                         *div = mv98dx4251_cpu_mpll_ratios[opt][1];
 137                 } else if (of_machine_is_compatible("marvell,armadaxp-98dx3236")) {
 138                         *mult = mv98dx3236_cpu_mpll_ratios[opt][0];
 139                         *div = mv98dx3236_cpu_mpll_ratios[opt][1];
 140                 }
 141                 break;
 142         }
 143 }
 144
 145 static const struct coreclk_soc_desc mv98dx3236_core_clocks = {
 146         .get_tclk_freq = mv98dx3236_get_tclk_freq,
 147         .get_cpu_freq = mv98dx3236_get_cpu_freq,
 148         .get_clk_ratio = mv98dx3236_get_clk_ratio,
 149         .ratios = mv98dx3236_core_ratios,
 150         .num_ratios = ARRAY_SIZE(mv98dx3236_core_ratios),
 151 };
 152
 153
 154 /*
 155  * Clock Gating Control
 156  */
 157
 158 static const struct clk_gating_soc_desc mv98dx3236_gating_desc[] __initconst = {
 159         { "ge1", NULL, 3, 0 },
 160         { "ge0", NULL, 4, 0 },
 161         { "pex00", NULL, 5, 0 },
 162         { "sdio", NULL, 17, 0 },
 163         { "usb0", NULL, 18, 0 },
 164         { "xor0", NULL, 22, 0 },
 165         { }
 166 };
 167
 168 static void __init mv98dx3236_clk_init(struct device_node *np)
 169 {
 170         struct device_node *cgnp =
 171                 of_find_compatible_node(NULL, NULL, "marvell,mv98dx3236-gating-clock");
 172
 173         mvebu_coreclk_setup(np, &mv98dx3236_core_clocks);
 174
 175         if (cgnp) {
 176                 mvebu_clk_gating_setup(cgnp, mv98dx3236_gating_desc);
 177                 of_node_put(cgnp);
 178         }
 179 }
 180 CLK_OF_DECLARE(mv98dx3236_clk, "marvell,mv98dx3236-core-clock", mv98dx3236_clk_init);