drivers/clk/spear/spear6xx_clock.c

   1 /*
   2  * SPEAr6xx machines clock framework source file
   3  *
   4  * Copyright (C) 2012 ST Microelectronics
   5  * Viresh Kumar <viresh.linux@gmail.com>
   6  *
   7  * This file is licensed under the terms of the GNU General Public
   8  * License version 2. This program is licensed "as is" without any
   9  * warranty of any kind, whether express or implied.
  10  */
  11
  12 #include <linux/clk.h>
  13 #include <linux/clkdev.h>
  14 #include <linux/io.h>
  15 #include <linux/spinlock_types.h>
  16 #include <mach/misc_regs.h>
  17 #include "clk.h"
  18
  19 static DEFINE_SPINLOCK(_lock);
  20
  21 #define PLL1_CTR                        (MISC_BASE + 0x008)
  22 #define PLL1_FRQ                        (MISC_BASE + 0x00C)
  23 #define PLL2_CTR                        (MISC_BASE + 0x014)
  24 #define PLL2_FRQ                        (MISC_BASE + 0x018)
  25 #define PLL_CLK_CFG                     (MISC_BASE + 0x020)
  26         /* PLL_CLK_CFG register masks */
  27         #define MCTR_CLK_SHIFT          28
  28         #define MCTR_CLK_MASK           3
  29
  30 #define CORE_CLK_CFG                    (MISC_BASE + 0x024)
  31         /* CORE CLK CFG register masks */
  32         #define HCLK_RATIO_SHIFT        10
  33         #define HCLK_RATIO_MASK         2
  34         #define PCLK_RATIO_SHIFT        8
  35         #define PCLK_RATIO_MASK         2
  36
  37 #define PERIP_CLK_CFG                   (MISC_BASE + 0x028)
  38         /* PERIP_CLK_CFG register masks */
  39         #define CLCD_CLK_SHIFT          2
  40         #define CLCD_CLK_MASK           2
  41         #define UART_CLK_SHIFT          4
  42         #define UART_CLK_MASK           1
  43         #define FIRDA_CLK_SHIFT         5
  44         #define FIRDA_CLK_MASK          2
  45         #define GPT0_CLK_SHIFT          8
  46         #define GPT1_CLK_SHIFT          10
  47         #define GPT2_CLK_SHIFT          11
  48         #define GPT3_CLK_SHIFT          12
  49         #define GPT_CLK_MASK            1
  50
  51 #define PERIP1_CLK_ENB                  (MISC_BASE + 0x02C)
  52         /* PERIP1_CLK_ENB register masks */
  53         #define UART0_CLK_ENB           3
  54         #define UART1_CLK_ENB           4
  55         #define SSP0_CLK_ENB            5
  56         #define SSP1_CLK_ENB            6
  57         #define I2C_CLK_ENB             7
  58         #define JPEG_CLK_ENB            8
  59         #define FSMC_CLK_ENB            9
  60         #define FIRDA_CLK_ENB           10
  61         #define GPT2_CLK_ENB            11
  62         #define GPT3_CLK_ENB            12
  63         #define GPIO2_CLK_ENB           13
  64         #define SSP2_CLK_ENB            14
  65         #define ADC_CLK_ENB             15
  66         #define GPT1_CLK_ENB            11
  67         #define RTC_CLK_ENB             17
  68         #define GPIO1_CLK_ENB           18
  69         #define DMA_CLK_ENB             19
  70         #define SMI_CLK_ENB             21
  71         #define CLCD_CLK_ENB            22
  72         #define GMAC_CLK_ENB            23
  73         #define USBD_CLK_ENB            24
  74         #define USBH0_CLK_ENB           25
  75         #define USBH1_CLK_ENB           26
  76
  77 #define PRSC0_CLK_CFG                   (MISC_BASE + 0x044)
  78 #define PRSC1_CLK_CFG                   (MISC_BASE + 0x048)
  79 #define PRSC2_CLK_CFG                   (MISC_BASE + 0x04C)
  80
  81 #define CLCD_CLK_SYNT                   (MISC_BASE + 0x05C)
  82 #define FIRDA_CLK_SYNT                  (MISC_BASE + 0x060)
  83 #define UART_CLK_SYNT                   (MISC_BASE + 0x064)
  84
  85 /* vco rate configuration table, in ascending order of rates */
  86 static struct pll_rate_tbl pll_rtbl[] = {
  87         {.mode = 0, .m = 0x53, .n = 0x0F, .p = 0x1}, /* vco 332 & pll 166 MHz */
  88         {.mode = 0, .m = 0x85, .n = 0x0F, .p = 0x1}, /* vco 532 & pll 266 MHz */
  89         {.mode = 0, .m = 0xA6, .n = 0x0F, .p = 0x1}, /* vco 664 & pll 332 MHz */
  90 };
  91
  92 /* aux rate configuration table, in ascending order of rates */
  93 static struct aux_rate_tbl aux_rtbl[] = {
  94         /* For PLL1 = 332 MHz */
  95         {.xscale = 2, .yscale = 8, .eq = 0}, /* 41.5 MHz */
  96         {.xscale = 2, .yscale = 4, .eq = 0}, /* 83 MHz */
  97         {.xscale = 1, .yscale = 2, .eq = 1}, /* 166 MHz */
  98 };
  99
 100 static const char *clcd_parents[] = { "pll3_clk", "clcd_syn_gclk", };
 101 static const char *firda_parents[] = { "pll3_clk", "firda_syn_gclk", };
 102 static const char *uart_parents[] = { "pll3_clk", "uart_syn_gclk", };
 103 static const char *gpt0_1_parents[] = { "pll3_clk", "gpt0_1_syn_clk", };
 104 static const char *gpt2_parents[] = { "pll3_clk", "gpt2_syn_clk", };
 105 static const char *gpt3_parents[] = { "pll3_clk", "gpt3_syn_clk", };
 106 static const char *ddr_parents[] = { "ahb_clk", "ahbmult2_clk", "none",
 107         "pll2_clk", };
 108
 109 /* gpt rate configuration table, in ascending order of rates */
 110 static struct gpt_rate_tbl gpt_rtbl[] = {
 111         /* For pll1 = 332 MHz */
 112         {.mscale = 4, .nscale = 0}, /* 41.5 MHz */
 113         {.mscale = 2, .nscale = 0}, /* 55.3 MHz */
 114         {.mscale = 1, .nscale = 0}, /* 83 MHz */
 115 };
 116
 117 void __init spear6xx_clk_init(void)
 118 {
 119         struct clk *clk, *clk1;
 120
 121         clk = clk_register_fixed_rate(NULL, "apb_pclk", NULL, CLK_IS_ROOT, 0);
 122         clk_register_clkdev(clk, "apb_pclk", NULL);
 123
 124         clk = clk_register_fixed_rate(NULL, "osc_32k_clk", NULL, CLK_IS_ROOT,
 125                         32000);
 126         clk_register_clkdev(clk, "osc_32k_clk", NULL);
 127
 128         clk = clk_register_fixed_rate(NULL, "osc_30m_clk", NULL, CLK_IS_ROOT,
 129                         30000000);
 130         clk_register_clkdev(clk, "osc_30m_clk", NULL);
 131
 132         /* clock derived from 32 KHz osc clk */
 133         clk = clk_register_gate(NULL, "rtc_spear", "osc_32k_clk", 0,
 134                         PERIP1_CLK_ENB, RTC_CLK_ENB, 0, &_lock);
 135         clk_register_clkdev(clk, NULL, "rtc-spear");
 136
 137         /* clock derived from 30 MHz osc clk */
 138         clk = clk_register_fixed_rate(NULL, "pll3_clk", "osc_24m_clk", 0,
 139                         48000000);
 140         clk_register_clkdev(clk, "pll3_clk", NULL);
 141
 142         clk = clk_register_vco_pll("vco1_clk", "pll1_clk", NULL, "osc_30m_clk",
 143                         0, PLL1_CTR, PLL1_FRQ, pll_rtbl, ARRAY_SIZE(pll_rtbl),
 144                         &_lock, &clk1, NULL);
 145         clk_register_clkdev(clk, "vco1_clk", NULL);
 146         clk_register_clkdev(clk1, "pll1_clk", NULL);
 147
 148         clk = clk_register_vco_pll("vco2_clk", "pll2_clk", NULL, "osc_30m_clk",
 149                         0, PLL2_CTR, PLL2_FRQ, pll_rtbl, ARRAY_SIZE(pll_rtbl),
 150                         &_lock, &clk1, NULL);
 151         clk_register_clkdev(clk, "vco2_clk", NULL);
 152         clk_register_clkdev(clk1, "pll2_clk", NULL);
 153
 154         clk = clk_register_fixed_factor(NULL, "wdt_clk", "osc_30m_clk", 0, 1,
 155                         1);
 156         clk_register_clkdev(clk, NULL, "wdt");
 157
 158         /* clock derived from pll1 clk */
 159         clk = clk_register_fixed_factor(NULL, "cpu_clk", "pll1_clk", 0, 1, 1);
 160         clk_register_clkdev(clk, "cpu_clk", NULL);
 161
 162         clk = clk_register_divider(NULL, "ahb_clk", "pll1_clk",
 163                         CLK_SET_RATE_PARENT, CORE_CLK_CFG, HCLK_RATIO_SHIFT,
 164                         HCLK_RATIO_MASK, 0, &_lock);
 165         clk_register_clkdev(clk, "ahb_clk", NULL);
 166
 167         clk = clk_register_aux("uart_syn_clk", "uart_syn_gclk", "pll1_clk", 0,
 168                         UART_CLK_SYNT, NULL, aux_rtbl, ARRAY_SIZE(aux_rtbl),
 169                         &_lock, &clk1);
 170         clk_register_clkdev(clk, "uart_syn_clk", NULL);
 171         clk_register_clkdev(clk1, "uart_syn_gclk", NULL);
 172
 173         clk = clk_register_mux(NULL, "uart_mclk", uart_parents,
 174                         ARRAY_SIZE(uart_parents), 0, PERIP_CLK_CFG,
 175                         UART_CLK_SHIFT, UART_CLK_MASK, 0, &_lock);
 176         clk_register_clkdev(clk, "uart_mclk", NULL);
 177
 178         clk = clk_register_gate(NULL, "uart0", "uart_mclk", 0, PERIP1_CLK_ENB,
 179                         UART0_CLK_ENB, 0, &_lock);
 180         clk_register_clkdev(clk, NULL, "d0000000.serial");
 181
 182         clk = clk_register_gate(NULL, "uart1", "uart_mclk", 0, PERIP1_CLK_ENB,
 183                         UART1_CLK_ENB, 0, &_lock);
 184         clk_register_clkdev(clk, NULL, "d0080000.serial");
 185
 186         clk = clk_register_aux("firda_syn_clk", "firda_syn_gclk", "pll1_clk",
 187                         0, FIRDA_CLK_SYNT, NULL, aux_rtbl, ARRAY_SIZE(aux_rtbl),
 188                         &_lock, &clk1);
 189         clk_register_clkdev(clk, "firda_syn_clk", NULL);
 190         clk_register_clkdev(clk1, "firda_syn_gclk", NULL);
 191
 192         clk = clk_register_mux(NULL, "firda_mclk", firda_parents,
 193                         ARRAY_SIZE(firda_parents), 0, PERIP_CLK_CFG,
 194                         FIRDA_CLK_SHIFT, FIRDA_CLK_MASK, 0, &_lock);
 195         clk_register_clkdev(clk, "firda_mclk", NULL);
 196
 197         clk = clk_register_gate(NULL, "firda_clk", "firda_mclk", 0,
 198                         PERIP1_CLK_ENB, FIRDA_CLK_ENB, 0, &_lock);
 199         clk_register_clkdev(clk, NULL, "firda");
 200
 201         clk = clk_register_aux("clcd_syn_clk", "clcd_syn_gclk", "pll1_clk",
 202                         0, CLCD_CLK_SYNT, NULL, aux_rtbl, ARRAY_SIZE(aux_rtbl),
 203                         &_lock, &clk1);
 204         clk_register_clkdev(clk, "clcd_syn_clk", NULL);
 205         clk_register_clkdev(clk1, "clcd_syn_gclk", NULL);
 206
 207         clk = clk_register_mux(NULL, "clcd_mclk", clcd_parents,
 208                         ARRAY_SIZE(clcd_parents), 0, PERIP_CLK_CFG,
 209                         CLCD_CLK_SHIFT, CLCD_CLK_MASK, 0, &_lock);
 210         clk_register_clkdev(clk, "clcd_mclk", NULL);
 211
 212         clk = clk_register_gate(NULL, "clcd_clk", "clcd_mclk", 0,
 213                         PERIP1_CLK_ENB, CLCD_CLK_ENB, 0, &_lock);
 214         clk_register_clkdev(clk, NULL, "clcd");
 215
 216         /* gpt clocks */
 217         clk = clk_register_gpt("gpt0_1_syn_clk", "pll1_clk", 0, PRSC0_CLK_CFG,
 218                         gpt_rtbl, ARRAY_SIZE(gpt_rtbl), &_lock);
 219         clk_register_clkdev(clk, "gpt0_1_syn_clk", NULL);
 220
 221         clk = clk_register_mux(NULL, "gpt0_mclk", gpt0_1_parents,
 222                         ARRAY_SIZE(gpt0_1_parents), 0, PERIP_CLK_CFG,
 223                         GPT0_CLK_SHIFT, GPT_CLK_MASK, 0, &_lock);
 224         clk_register_clkdev(clk, NULL, "gpt0");
 225
 226         clk = clk_register_mux(NULL, "gpt1_mclk", gpt0_1_parents,
 227                         ARRAY_SIZE(gpt0_1_parents), 0, PERIP_CLK_CFG,
 228                         GPT1_CLK_SHIFT, GPT_CLK_MASK, 0, &_lock);
 229         clk_register_clkdev(clk, "gpt1_mclk", NULL);
 230
 231         clk = clk_register_gate(NULL, "gpt1_clk", "gpt1_mclk", 0,
 232                         PERIP1_CLK_ENB, GPT1_CLK_ENB, 0, &_lock);
 233         clk_register_clkdev(clk, NULL, "gpt1");
 234
 235         clk = clk_register_gpt("gpt2_syn_clk", "pll1_clk", 0, PRSC1_CLK_CFG,
 236                         gpt_rtbl, ARRAY_SIZE(gpt_rtbl), &_lock);
 237         clk_register_clkdev(clk, "gpt2_syn_clk", NULL);
 238
 239         clk = clk_register_mux(NULL, "gpt2_mclk", gpt2_parents,
 240                         ARRAY_SIZE(gpt2_parents), 0, PERIP_CLK_CFG,
 241                         GPT2_CLK_SHIFT, GPT_CLK_MASK, 0, &_lock);
 242         clk_register_clkdev(clk, "gpt2_mclk", NULL);
 243
 244         clk = clk_register_gate(NULL, "gpt2_clk", "gpt2_mclk", 0,
 245                         PERIP1_CLK_ENB, GPT2_CLK_ENB, 0, &_lock);
 246         clk_register_clkdev(clk, NULL, "gpt2");
 247
 248         clk = clk_register_gpt("gpt3_syn_clk", "pll1_clk", 0, PRSC2_CLK_CFG,
 249                         gpt_rtbl, ARRAY_SIZE(gpt_rtbl), &_lock);
 250         clk_register_clkdev(clk, "gpt3_syn_clk", NULL);
 251
 252         clk = clk_register_mux(NULL, "gpt3_mclk", gpt3_parents,
 253                         ARRAY_SIZE(gpt3_parents), 0, PERIP_CLK_CFG,
 254                         GPT3_CLK_SHIFT, GPT_CLK_MASK, 0, &_lock);
 255         clk_register_clkdev(clk, "gpt3_mclk", NULL);
 256
 257         clk = clk_register_gate(NULL, "gpt3_clk", "gpt3_mclk", 0,
 258                         PERIP1_CLK_ENB, GPT3_CLK_ENB, 0, &_lock);
 259         clk_register_clkdev(clk, NULL, "gpt3");
 260
 261         /* clock derived from pll3 clk */
 262         clk = clk_register_gate(NULL, "usbh0_clk", "pll3_clk", 0,
 263                         PERIP1_CLK_ENB, USBH0_CLK_ENB, 0, &_lock);
 264         clk_register_clkdev(clk, NULL, "usbh.0_clk");
 265
 266         clk = clk_register_gate(NULL, "usbh1_clk", "pll3_clk", 0,
 267                         PERIP1_CLK_ENB, USBH1_CLK_ENB, 0, &_lock);
 268         clk_register_clkdev(clk, NULL, "usbh.1_clk");
 269
 270         clk = clk_register_gate(NULL, "usbd_clk", "pll3_clk", 0, PERIP1_CLK_ENB,
 271                         USBD_CLK_ENB, 0, &_lock);
 272         clk_register_clkdev(clk, NULL, "designware_udc");
 273
 274         /* clock derived from ahb clk */
 275         clk = clk_register_fixed_factor(NULL, "ahbmult2_clk", "ahb_clk", 0, 2,
 276                         1);
 277         clk_register_clkdev(clk, "ahbmult2_clk", NULL);
 278
 279         clk = clk_register_mux(NULL, "ddr_clk", ddr_parents,
 280                         ARRAY_SIZE(ddr_parents), 0, PLL_CLK_CFG, MCTR_CLK_SHIFT,
 281                         MCTR_CLK_MASK, 0, &_lock);
 282         clk_register_clkdev(clk, "ddr_clk", NULL);
 283
 284         clk = clk_register_divider(NULL, "apb_clk", "ahb_clk",
 285                         CLK_SET_RATE_PARENT, CORE_CLK_CFG, PCLK_RATIO_SHIFT,
 286                         PCLK_RATIO_MASK, 0, &_lock);
 287         clk_register_clkdev(clk, "apb_clk", NULL);
 288
 289         clk = clk_register_gate(NULL, "dma_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
 290                         DMA_CLK_ENB, 0, &_lock);
 291         clk_register_clkdev(clk, NULL, "fc400000.dma");
 292
 293         clk = clk_register_gate(NULL, "fsmc_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
 294                         FSMC_CLK_ENB, 0, &_lock);
 295         clk_register_clkdev(clk, NULL, "d1800000.flash");
 296
 297         clk = clk_register_gate(NULL, "gmac_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
 298                         GMAC_CLK_ENB, 0, &_lock);
 299         clk_register_clkdev(clk, NULL, "e0800000.ethernet");
 300
 301         clk = clk_register_gate(NULL, "i2c_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
 302                         I2C_CLK_ENB, 0, &_lock);
 303         clk_register_clkdev(clk, NULL, "d0200000.i2c");
 304
 305         clk = clk_register_gate(NULL, "jpeg_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
 306                         JPEG_CLK_ENB, 0, &_lock);
 307         clk_register_clkdev(clk, NULL, "jpeg");
 308
 309         clk = clk_register_gate(NULL, "smi_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
 310                         SMI_CLK_ENB, 0, &_lock);
 311         clk_register_clkdev(clk, NULL, "fc000000.flash");
 312
 313         /* clock derived from apb clk */
 314         clk = clk_register_gate(NULL, "adc_clk", "apb_clk", 0, PERIP1_CLK_ENB,
 315                         ADC_CLK_ENB, 0, &_lock);
 316         clk_register_clkdev(clk, NULL, "adc");
 317
 318         clk = clk_register_fixed_factor(NULL, "gpio0_clk", "apb_clk", 0, 1, 1);
 319         clk_register_clkdev(clk, NULL, "f0100000.gpio");
 320
 321         clk = clk_register_gate(NULL, "gpio1_clk", "apb_clk", 0, PERIP1_CLK_ENB,
 322                         GPIO1_CLK_ENB, 0, &_lock);
 323         clk_register_clkdev(clk, NULL, "fc980000.gpio");
 324
 325         clk = clk_register_gate(NULL, "gpio2_clk", "apb_clk", 0, PERIP1_CLK_ENB,
 326                         GPIO2_CLK_ENB, 0, &_lock);
 327         clk_register_clkdev(clk, NULL, "d8100000.gpio");
 328
 329         clk = clk_register_gate(NULL, "ssp0_clk", "apb_clk", 0, PERIP1_CLK_ENB,
 330                         SSP0_CLK_ENB, 0, &_lock);
 331         clk_register_clkdev(clk, NULL, "ssp-pl022.0");
 332
 333         clk = clk_register_gate(NULL, "ssp1_clk", "apb_clk", 0, PERIP1_CLK_ENB,
 334                         SSP1_CLK_ENB, 0, &_lock);
 335         clk_register_clkdev(clk, NULL, "ssp-pl022.1");
 336
 337         clk = clk_register_gate(NULL, "ssp2_clk", "apb_clk", 0, PERIP1_CLK_ENB,
 338                         SSP2_CLK_ENB, 0, &_lock);
 339         clk_register_clkdev(clk, NULL, "ssp-pl022.2");
 340 }