drivers/clk/mvebu/dove.c

   1 /*
   2  * Marvell Dove SoC clocks
   3  *
   4  * Copyright (C) 2012 Marvell
   5  *
   6  * Gregory CLEMENT <gregory.clement@free-electrons.com>
   7  * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>
   8  * Andrew Lunn <andrew@lunn.ch>
   9  *
  10  * This file is licensed under the terms of the GNU General Public
  11  * License version 2.  This program is licensed "as is" without any
  12  * warranty of any kind, whether express or implied.
  13  */
  14
  15 #include <linux/kernel.h>
  16 #include <linux/clk-provider.h>
  17 #include <linux/io.h>
  18 #include <linux/of.h>
  19 #include "common.h"
  20 #include "dove-divider.h"
  21
  22 /*
  23  * Core Clocks
  24  *
  25  * Dove PLL sample-at-reset configuration
  26  *
  27  * SAR0[8:5]   : CPU frequency
  28  *               5  = 1000 MHz
  29  *               6  =  933 MHz
  30  *               7  =  933 MHz
  31  *               8  =  800 MHz
  32  *               9  =  800 MHz
  33  *               10 =  800 MHz
  34  *               11 = 1067 MHz
  35  *               12 =  667 MHz
  36  *               13 =  533 MHz
  37  *               14 =  400 MHz
  38  *               15 =  333 MHz
  39  *               others reserved.
  40  *
  41  * SAR0[11:9]  : CPU to L2 Clock divider ratio
  42  *               0 = (1/1) * CPU
  43  *               2 = (1/2) * CPU
  44  *               4 = (1/3) * CPU
  45  *               6 = (1/4) * CPU
  46  *               others reserved.
  47  *
  48  * SAR0[15:12] : CPU to DDR DRAM Clock divider ratio
  49  *               0  = (1/1) * CPU
  50  *               2  = (1/2) * CPU
  51  *               3  = (2/5) * CPU
  52  *               4  = (1/3) * CPU
  53  *               6  = (1/4) * CPU
  54  *               8  = (1/5) * CPU
  55  *               10 = (1/6) * CPU
  56  *               12 = (1/7) * CPU
  57  *               14 = (1/8) * CPU
  58  *               15 = (1/10) * CPU
  59  *               others reserved.
  60  *
  61  * SAR0[24:23] : TCLK frequency
  62  *               0 = 166 MHz
  63  *               1 = 125 MHz
  64  *               others reserved.
  65  */
  66
  67 #define SAR_DOVE_CPU_FREQ               5
  68 #define SAR_DOVE_CPU_FREQ_MASK          0xf
  69 #define SAR_DOVE_L2_RATIO               9
  70 #define SAR_DOVE_L2_RATIO_MASK          0x7
  71 #define SAR_DOVE_DDR_RATIO              12
  72 #define SAR_DOVE_DDR_RATIO_MASK         0xf
  73 #define SAR_DOVE_TCLK_FREQ              23
  74 #define SAR_DOVE_TCLK_FREQ_MASK         0x3
  75
  76 enum { DOVE_CPU_TO_L2, DOVE_CPU_TO_DDR };
  77
  78 static const struct coreclk_ratio dove_coreclk_ratios[] __initconst = {
  79         { .id = DOVE_CPU_TO_L2, .name = "l2clk", },
  80         { .id = DOVE_CPU_TO_DDR, .name = "ddrclk", }
  81 };
  82
  83 static const u32 dove_tclk_freqs[] __initconst = {
  84         166666667,
  85         125000000,
  86         0, 0
  87 };
  88
  89 static u32 __init dove_get_tclk_freq(void __iomem *sar)
  90 {
  91         u32 opt = (readl(sar) >> SAR_DOVE_TCLK_FREQ) &
  92                 SAR_DOVE_TCLK_FREQ_MASK;
  93         return dove_tclk_freqs[opt];
  94 }
  95
  96 static const u32 dove_cpu_freqs[] __initconst = {
  97         0, 0, 0, 0, 0,
  98         1000000000,
  99         933333333, 933333333,
 100         800000000, 800000000, 800000000,
 101         1066666667,
 102         666666667,
 103         533333333,
 104         400000000,
 105         333333333
 106 };
 107
 108 static u32 __init dove_get_cpu_freq(void __iomem *sar)
 109 {
 110         u32 opt = (readl(sar) >> SAR_DOVE_CPU_FREQ) &
 111                 SAR_DOVE_CPU_FREQ_MASK;
 112         return dove_cpu_freqs[opt];
 113 }
 114
 115 static const int dove_cpu_l2_ratios[8][2] __initconst = {
 116         { 1, 1 }, { 0, 1 }, { 1, 2 }, { 0, 1 },
 117         { 1, 3 }, { 0, 1 }, { 1, 4 }, { 0, 1 }
 118 };
 119
 120 static const int dove_cpu_ddr_ratios[16][2] __initconst = {
 121         { 1, 1 }, { 0, 1 }, { 1, 2 }, { 2, 5 },
 122         { 1, 3 }, { 0, 1 }, { 1, 4 }, { 0, 1 },
 123         { 1, 5 }, { 0, 1 }, { 1, 6 }, { 0, 1 },
 124         { 1, 7 }, { 0, 1 }, { 1, 8 }, { 1, 10 }
 125 };
 126
 127 static void __init dove_get_clk_ratio(
 128         void __iomem *sar, int id, int *mult, int *div)
 129 {
 130         switch (id) {
 131         case DOVE_CPU_TO_L2:
 132         {
 133                 u32 opt = (readl(sar) >> SAR_DOVE_L2_RATIO) &
 134                         SAR_DOVE_L2_RATIO_MASK;
 135                 *mult = dove_cpu_l2_ratios[opt][0];
 136                 *div = dove_cpu_l2_ratios[opt][1];
 137                 break;
 138         }
 139         case DOVE_CPU_TO_DDR:
 140         {
 141                 u32 opt = (readl(sar) >> SAR_DOVE_DDR_RATIO) &
 142                         SAR_DOVE_DDR_RATIO_MASK;
 143                 *mult = dove_cpu_ddr_ratios[opt][0];
 144                 *div = dove_cpu_ddr_ratios[opt][1];
 145                 break;
 146         }
 147         }
 148 }
 149
 150 static const struct coreclk_soc_desc dove_coreclks = {
 151         .get_tclk_freq = dove_get_tclk_freq,
 152         .get_cpu_freq = dove_get_cpu_freq,
 153         .get_clk_ratio = dove_get_clk_ratio,
 154         .ratios = dove_coreclk_ratios,
 155         .num_ratios = ARRAY_SIZE(dove_coreclk_ratios),
 156 };
 157
 158 /*
 159  * Clock Gating Control
 160  */
 161
 162 static const struct clk_gating_soc_desc dove_gating_desc[] __initconst = {
 163         { "usb0", NULL, 0, 0 },
 164         { "usb1", NULL, 1, 0 },
 165         { "ge", "gephy", 2, 0 },
 166         { "sata", NULL, 3, 0 },
 167         { "pex0", NULL, 4, 0 },
 168         { "pex1", NULL, 5, 0 },
 169         { "sdio0", NULL, 8, 0 },
 170         { "sdio1", NULL, 9, 0 },
 171         { "nand", NULL, 10, 0 },
 172         { "camera", NULL, 11, 0 },
 173         { "i2s0", NULL, 12, 0 },
 174         { "i2s1", NULL, 13, 0 },
 175         { "crypto", NULL, 15, 0 },
 176         { "ac97", NULL, 21, 0 },
 177         { "pdma", NULL, 22, 0 },
 178         { "xor0", NULL, 23, 0 },
 179         { "xor1", NULL, 24, 0 },
 180         { "gephy", NULL, 30, 0 },
 181         { }
 182 };
 183
 184 static void __init dove_clk_init(struct device_node *np)
 185 {
 186         struct device_node *cgnp =
 187                 of_find_compatible_node(NULL, NULL, "marvell,dove-gating-clock");
 188         struct device_node *ddnp =
 189                 of_find_compatible_node(NULL, NULL, "marvell,dove-divider-clock");
 190
 191         mvebu_coreclk_setup(np, &dove_coreclks);
 192
 193         if (ddnp) {
 194                 dove_divider_clk_init(ddnp);
 195                 of_node_put(ddnp);
 196         }
 197
 198         if (cgnp) {
 199                 mvebu_clk_gating_setup(cgnp, dove_gating_desc);
 200                 of_node_put(cgnp);
 201         }
 202 }
 203 CLK_OF_DECLARE(dove_clk, "marvell,dove-core-clock", dove_clk_init);