arch/arm/mach-s5p64x0/clock.c

   1 /* linux/arch/arm/mach-s5p64x0/clock.c
   2  *
   3  * Copyright (c) 2010 Samsung Electronics Co., Ltd.
   4  *              http://www.samsung.com
   5  *
   6  * S5P64X0 - Clock support
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11 */
  12
  13 #include <linux/init.h>
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/list.h>
  17 #include <linux/errno.h>
  18 #include <linux/err.h>
  19 #include <linux/clk.h>
  20 #include <linux/device.h>
  21 #include <linux/io.h>
  22
  23 #include <mach/hardware.h>
  24 #include <mach/map.h>
  25 #include <mach/regs-clock.h>
  26
  27 #include <plat/cpu-freq.h>
  28 #include <plat/clock.h>
  29 #include <plat/cpu.h>
  30 #include <plat/pll.h>
  31 #include <plat/s5p-clock.h>
  32 #include <plat/clock-clksrc.h>
  33
  34 #include "common.h"
  35
  36 struct clksrc_clk clk_mout_apll = {
  37         .clk    = {
  38                 .name           = "mout_apll",
  39                 .id             = -1,
  40         },
  41         .sources        = &clk_src_apll,
  42         .reg_src        = { .reg = S5P64X0_CLK_SRC0, .shift = 0, .size = 1 },
  43 };
  44
  45 struct clksrc_clk clk_mout_mpll = {
  46         .clk    = {
  47                 .name           = "mout_mpll",
  48                 .id             = -1,
  49         },
  50         .sources        = &clk_src_mpll,
  51         .reg_src        = { .reg = S5P64X0_CLK_SRC0, .shift = 1, .size = 1 },
  52 };
  53
  54 struct clksrc_clk clk_mout_epll = {
  55         .clk    = {
  56                 .name           = "mout_epll",
  57                 .id             = -1,
  58         },
  59         .sources        = &clk_src_epll,
  60         .reg_src        = { .reg = S5P64X0_CLK_SRC0, .shift = 2, .size = 1 },
  61 };
  62
  63 enum perf_level {
  64         L0 = 532*1000,
  65         L1 = 266*1000,
  66         L2 = 133*1000,
  67 };
  68
  69 static const u32 clock_table[][3] = {
  70         /*{ARM_CLK, DIVarm, DIVhclk}*/
  71         {L0 * 1000, (0 << ARM_DIV_RATIO_SHIFT), (3 << S5P64X0_CLKDIV0_HCLK_SHIFT)},
  72         {L1 * 1000, (1 << ARM_DIV_RATIO_SHIFT), (1 << S5P64X0_CLKDIV0_HCLK_SHIFT)},
  73         {L2 * 1000, (3 << ARM_DIV_RATIO_SHIFT), (0 << S5P64X0_CLKDIV0_HCLK_SHIFT)},
  74 };
  75
  76 unsigned long s5p64x0_armclk_get_rate(struct clk *clk)
  77 {
  78         unsigned long rate = clk_get_rate(clk->parent);
  79         u32 clkdiv;
  80
  81         /* divisor mask starts at bit0, so no need to shift */
  82         clkdiv = __raw_readl(ARM_CLK_DIV) & ARM_DIV_MASK;
  83
  84         return rate / (clkdiv + 1);
  85 }
  86
  87 unsigned long s5p64x0_armclk_round_rate(struct clk *clk, unsigned long rate)
  88 {
  89         u32 iter;
  90
  91         for (iter = 1 ; iter < ARRAY_SIZE(clock_table) ; iter++) {
  92                 if (rate > clock_table[iter][0])
  93                         return clock_table[iter-1][0];
  94         }
  95
  96         return clock_table[ARRAY_SIZE(clock_table) - 1][0];
  97 }
  98
  99 int s5p64x0_armclk_set_rate(struct clk *clk, unsigned long rate)
 100 {
 101         u32 round_tmp;
 102         u32 iter;
 103         u32 clk_div0_tmp;
 104         u32 cur_rate = clk->ops->get_rate(clk);
 105         unsigned long flags;
 106
 107         round_tmp = clk->ops->round_rate(clk, rate);
 108         if (round_tmp == cur_rate)
 109                 return 0;
 110
 111
 112         for (iter = 0 ; iter < ARRAY_SIZE(clock_table) ; iter++) {
 113                 if (round_tmp == clock_table[iter][0])
 114                         break;
 115         }
 116
 117         if (iter >= ARRAY_SIZE(clock_table))
 118                 iter = ARRAY_SIZE(clock_table) - 1;
 119
 120         local_irq_save(flags);
 121         if (cur_rate > round_tmp) {
 122                 /* Frequency Down */
 123                 clk_div0_tmp = __raw_readl(ARM_CLK_DIV) & ~(ARM_DIV_MASK);
 124                 clk_div0_tmp |= clock_table[iter][1];
 125                 __raw_writel(clk_div0_tmp, ARM_CLK_DIV);
 126
 127                 clk_div0_tmp = __raw_readl(ARM_CLK_DIV) &
 128                                 ~(S5P64X0_CLKDIV0_HCLK_MASK);
 129                 clk_div0_tmp |= clock_table[iter][2];
 130                 __raw_writel(clk_div0_tmp, ARM_CLK_DIV);
 131
 132
 133         } else {
 134                 /* Frequency Up */
 135                 clk_div0_tmp = __raw_readl(ARM_CLK_DIV) &
 136                                 ~(S5P64X0_CLKDIV0_HCLK_MASK);
 137                 clk_div0_tmp |= clock_table[iter][2];
 138                 __raw_writel(clk_div0_tmp, ARM_CLK_DIV);
 139
 140                 clk_div0_tmp = __raw_readl(ARM_CLK_DIV) & ~(ARM_DIV_MASK);
 141                 clk_div0_tmp |= clock_table[iter][1];
 142                 __raw_writel(clk_div0_tmp, ARM_CLK_DIV);
 143         }
 144         local_irq_restore(flags);
 145
 146         clk->rate = clock_table[iter][0];
 147
 148         return 0;
 149 }
 150
 151 struct clk_ops s5p64x0_clkarm_ops = {
 152         .get_rate       = s5p64x0_armclk_get_rate,
 153         .set_rate       = s5p64x0_armclk_set_rate,
 154         .round_rate     = s5p64x0_armclk_round_rate,
 155 };
 156
 157 struct clksrc_clk clk_armclk = {
 158         .clk    = {
 159                 .name           = "armclk",
 160                 .id             = 1,
 161                 .parent         = &clk_mout_apll.clk,
 162                 .ops            = &s5p64x0_clkarm_ops,
 163         },
 164         .reg_div        = { .reg = S5P64X0_CLK_DIV0, .shift = 0, .size = 4 },
 165 };
 166
 167 struct clksrc_clk clk_dout_mpll = {
 168         .clk    = {
 169                 .name           = "dout_mpll",
 170                 .id             = -1,
 171                 .parent         = &clk_mout_mpll.clk,
 172         },
 173         .reg_div        = { .reg = S5P64X0_CLK_DIV0, .shift = 4, .size = 1 },
 174 };
 175
 176 struct clk *clkset_hclk_low_list[] = {
 177         &clk_mout_apll.clk,
 178         &clk_mout_mpll.clk,
 179 };
 180
 181 struct clksrc_sources clkset_hclk_low = {
 182         .sources        = clkset_hclk_low_list,
 183         .nr_sources     = ARRAY_SIZE(clkset_hclk_low_list),
 184 };
 185
 186 int s5p64x0_pclk_ctrl(struct clk *clk, int enable)
 187 {
 188         return s5p_gatectrl(S5P64X0_CLK_GATE_PCLK, clk, enable);
 189 }
 190
 191 int s5p64x0_hclk0_ctrl(struct clk *clk, int enable)
 192 {
 193         return s5p_gatectrl(S5P64X0_CLK_GATE_HCLK0, clk, enable);
 194 }
 195
 196 int s5p64x0_hclk1_ctrl(struct clk *clk, int enable)
 197 {
 198         return s5p_gatectrl(S5P64X0_CLK_GATE_HCLK1, clk, enable);
 199 }
 200
 201 int s5p64x0_sclk_ctrl(struct clk *clk, int enable)
 202 {
 203         return s5p_gatectrl(S5P64X0_CLK_GATE_SCLK0, clk, enable);
 204 }
 205
 206 int s5p64x0_sclk1_ctrl(struct clk *clk, int enable)
 207 {
 208         return s5p_gatectrl(S5P64X0_CLK_GATE_SCLK1, clk, enable);
 209 }
 210
 211 int s5p64x0_mem_ctrl(struct clk *clk, int enable)
 212 {
 213         return s5p_gatectrl(S5P64X0_CLK_GATE_MEM0, clk, enable);
 214 }
 215
 216 int s5p64x0_clk48m_ctrl(struct clk *clk, int enable)
 217 {
 218         unsigned long flags;
 219         u32 val;
 220
 221         /* can't rely on clock lock, this register has other usages */
 222         local_irq_save(flags);
 223
 224         val = __raw_readl(S5P64X0_OTHERS);
 225         if (enable)
 226                 val |= S5P64X0_OTHERS_USB_SIG_MASK;
 227         else
 228                 val &= ~S5P64X0_OTHERS_USB_SIG_MASK;
 229
 230         __raw_writel(val, S5P64X0_OTHERS);
 231
 232         local_irq_restore(flags);
 233
 234         return 0;
 235 }