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 static 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 static unsigned long s5p64x0_armclk_round_rate(struct clk *clk,
  88                                                unsigned long rate)
  89 {
  90         u32 iter;
  91
  92         for (iter = 1 ; iter < ARRAY_SIZE(clock_table) ; iter++) {
  93                 if (rate > clock_table[iter][0])
  94                         return clock_table[iter-1][0];
  95         }
  96
  97         return clock_table[ARRAY_SIZE(clock_table) - 1][0];
  98 }
  99
 100 static int s5p64x0_armclk_set_rate(struct clk *clk, unsigned long rate)
 101 {
 102         u32 round_tmp;
 103         u32 iter;
 104         u32 clk_div0_tmp;
 105         u32 cur_rate = clk->ops->get_rate(clk);
 106         unsigned long flags;
 107
 108         round_tmp = clk->ops->round_rate(clk, rate);
 109         if (round_tmp == cur_rate)
 110                 return 0;
 111
 112
 113         for (iter = 0 ; iter < ARRAY_SIZE(clock_table) ; iter++) {
 114                 if (round_tmp == clock_table[iter][0])
 115                         break;
 116         }
 117
 118         if (iter >= ARRAY_SIZE(clock_table))
 119                 iter = ARRAY_SIZE(clock_table) - 1;
 120
 121         local_irq_save(flags);
 122         if (cur_rate > round_tmp) {
 123                 /* Frequency Down */
 124                 clk_div0_tmp = __raw_readl(ARM_CLK_DIV) & ~(ARM_DIV_MASK);
 125                 clk_div0_tmp |= clock_table[iter][1];
 126                 __raw_writel(clk_div0_tmp, ARM_CLK_DIV);
 127
 128                 clk_div0_tmp = __raw_readl(ARM_CLK_DIV) &
 129                                 ~(S5P64X0_CLKDIV0_HCLK_MASK);
 130                 clk_div0_tmp |= clock_table[iter][2];
 131                 __raw_writel(clk_div0_tmp, ARM_CLK_DIV);
 132
 133
 134         } else {
 135                 /* Frequency Up */
 136                 clk_div0_tmp = __raw_readl(ARM_CLK_DIV) &
 137                                 ~(S5P64X0_CLKDIV0_HCLK_MASK);
 138                 clk_div0_tmp |= clock_table[iter][2];
 139                 __raw_writel(clk_div0_tmp, ARM_CLK_DIV);
 140
 141                 clk_div0_tmp = __raw_readl(ARM_CLK_DIV) & ~(ARM_DIV_MASK);
 142                 clk_div0_tmp |= clock_table[iter][1];
 143                 __raw_writel(clk_div0_tmp, ARM_CLK_DIV);
 144         }
 145         local_irq_restore(flags);
 146
 147         clk->rate = clock_table[iter][0];
 148
 149         return 0;
 150 }
 151
 152 static struct clk_ops s5p64x0_clkarm_ops = {
 153         .get_rate       = s5p64x0_armclk_get_rate,
 154         .set_rate       = s5p64x0_armclk_set_rate,
 155         .round_rate     = s5p64x0_armclk_round_rate,
 156 };
 157
 158 struct clksrc_clk clk_armclk = {
 159         .clk    = {
 160                 .name           = "armclk",
 161                 .id             = 1,
 162                 .parent         = &clk_mout_apll.clk,
 163                 .ops            = &s5p64x0_clkarm_ops,
 164         },
 165         .reg_div        = { .reg = S5P64X0_CLK_DIV0, .shift = 0, .size = 4 },
 166 };
 167
 168 struct clksrc_clk clk_dout_mpll = {
 169         .clk    = {
 170                 .name           = "dout_mpll",
 171                 .id             = -1,
 172                 .parent         = &clk_mout_mpll.clk,
 173         },
 174         .reg_div        = { .reg = S5P64X0_CLK_DIV0, .shift = 4, .size = 1 },
 175 };
 176
 177 static struct clk *clkset_hclk_low_list[] = {
 178         &clk_mout_apll.clk,
 179         &clk_mout_mpll.clk,
 180 };
 181
 182 struct clksrc_sources clkset_hclk_low = {
 183         .sources        = clkset_hclk_low_list,
 184         .nr_sources     = ARRAY_SIZE(clkset_hclk_low_list),
 185 };
 186
 187 int s5p64x0_pclk_ctrl(struct clk *clk, int enable)
 188 {
 189         return s5p_gatectrl(S5P64X0_CLK_GATE_PCLK, clk, enable);
 190 }
 191
 192 int s5p64x0_hclk0_ctrl(struct clk *clk, int enable)
 193 {
 194         return s5p_gatectrl(S5P64X0_CLK_GATE_HCLK0, clk, enable);
 195 }
 196
 197 int s5p64x0_hclk1_ctrl(struct clk *clk, int enable)
 198 {
 199         return s5p_gatectrl(S5P64X0_CLK_GATE_HCLK1, clk, enable);
 200 }
 201
 202 int s5p64x0_sclk_ctrl(struct clk *clk, int enable)
 203 {
 204         return s5p_gatectrl(S5P64X0_CLK_GATE_SCLK0, clk, enable);
 205 }
 206
 207 int s5p64x0_sclk1_ctrl(struct clk *clk, int enable)
 208 {
 209         return s5p_gatectrl(S5P64X0_CLK_GATE_SCLK1, clk, enable);
 210 }
 211
 212 int s5p64x0_mem_ctrl(struct clk *clk, int enable)
 213 {
 214         return s5p_gatectrl(S5P64X0_CLK_GATE_MEM0, clk, enable);
 215 }
 216
 217 int s5p64x0_clk48m_ctrl(struct clk *clk, int enable)
 218 {
 219         unsigned long flags;
 220         u32 val;
 221
 222         /* can't rely on clock lock, this register has other usages */
 223         local_irq_save(flags);
 224
 225         val = __raw_readl(S5P64X0_OTHERS);
 226         if (enable)
 227                 val |= S5P64X0_OTHERS_USB_SIG_MASK;
 228         else
 229                 val &= ~S5P64X0_OTHERS_USB_SIG_MASK;
 230
 231         __raw_writel(val, S5P64X0_OTHERS);
 232
 233         local_irq_restore(flags);
 234
 235         return 0;
 236 }