drivers/clk/spear/spear6xx_clock.c

   1 /*
   2  * SPEAr6xx machines clock framework source file
   3  *
   4  * Copyright (C) 2012 ST Microelectronics
   5  * Viresh Kumar <vireshk@kernel.org>
   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 "clk.h"
  17
  18 static DEFINE_SPINLOCK(_lock);
  19
  20 #define PLL1_CTR                        (misc_base + 0x008)
  21 #define PLL1_FRQ                        (misc_base + 0x00C)
  22 #define PLL2_CTR                        (misc_base + 0x014)
  23 #define PLL2_FRQ                        (misc_base + 0x018)
  24 #define PLL_CLK_CFG                     (misc_base + 0x020)
  25         /* PLL_CLK_CFG register masks */
  26         #define MCTR_CLK_SHIFT          28
  27         #define MCTR_CLK_MASK           3
  28
  29 #define CORE_CLK_CFG                    (misc_base + 0x024)
  30         /* CORE CLK CFG register masks */
  31         #define HCLK_RATIO_SHIFT        10
  32         #define HCLK_RATIO_MASK         2
  33         #define PCLK_RATIO_SHIFT        8
  34         #define PCLK_RATIO_MASK         2
  35
  36 #define PERIP_CLK_CFG                   (misc_base + 0x028)
  37         /* PERIP_CLK_CFG register masks */
  38         #define CLCD_CLK_SHIFT          2
  39         #define CLCD_CLK_MASK           2
  40         #define UART_CLK_SHIFT          4
  41         #define UART_CLK_MASK           1
  42         #define FIRDA_CLK_SHIFT         5
  43         #define FIRDA_CLK_MASK          2
  44         #define GPT0_CLK_SHIFT          8
  45         #define GPT1_CLK_SHIFT          10
  46         #define GPT2_CLK_SHIFT          11
  47         #define GPT3_CLK_SHIFT          12
  48         #define GPT_CLK_MASK            1
  49
  50 #define PERIP1_CLK_ENB                  (misc_base + 0x02C)
  51         /* PERIP1_CLK_ENB register masks */
  52         #define UART0_CLK_ENB           3
  53         #define UART1_CLK_ENB           4
  54         #define SSP0_CLK_ENB            5
  55         #define SSP1_CLK_ENB            6
  56         #define I2C_CLK_ENB             7
  57         #define JPEG_CLK_ENB            8
  58         #define FSMC_CLK_ENB            9
  59         #define FIRDA_CLK_ENB           10
  60         #define GPT2_CLK_ENB            11
  61         #define GPT3_CLK_ENB            12
  62         #define GPIO2_CLK_ENB           13
  63         #define SSP2_CLK_ENB            14
  64         #define ADC_CLK_ENB             15
  65         #define GPT1_CLK_ENB            11
  66         #define RTC_CLK_ENB             17
  67         #define GPIO1_CLK_ENB           18
  68         #define DMA_CLK_ENB             19
  69         #define SMI_CLK_ENB             21
  70         #define CLCD_CLK_ENB            22
  71         #define GMAC_CLK_ENB            23
  72         #define USBD_CLK_ENB            24
  73         #define USBH0_CLK_ENB           25
  74         #define USBH1_CLK_ENB           26
  75
  76 #define PRSC0_CLK_CFG                   (misc_base + 0x044)
  77 #define PRSC1_CLK_CFG                   (misc_base + 0x048)
  78 #define PRSC2_CLK_CFG                   (misc_base + 0x04C)
  79
  80 #define CLCD_CLK_SYNT                   (misc_base + 0x05C)
  81 #define FIRDA_CLK_SYNT                  (misc_base + 0x060)
  82 #define UART_CLK_SYNT                   (misc_base + 0x064)
  83
  84 /* vco rate configuration table, in ascending order of rates */
  85 static struct pll_rate_tbl pll_rtbl[] = {
  86         {.mode = 0, .m = 0x53, .n = 0x0F, .p = 0x1}, /* vco 332 & pll 166 MHz */
  87         {.mode = 0, .m = 0x85, .n = 0x0F, .p = 0x1}, /* vco 532 & pll 266 MHz */
  88         {.mode = 0, .m = 0xA6, .n = 0x0F, .p = 0x1}, /* vco 664 & pll 332 MHz */
  89 };
  90
  91 /* aux rate configuration table, in ascending order of rates */
  92 static struct aux_rate_tbl aux_rtbl[] = {
  93         /* For PLL1 = 332 MHz */
  94         {.xscale = 2, .yscale = 27, .eq = 0}, /* 12.296 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 __iomem *misc_base)
 118 {
 119         struct clk *clk, *clk1;
 120
 121         clk = clk_register_fixed_rate(NULL, "osc_32k_clk", NULL, CLK_IS_ROOT,
 122                         32000);
 123         clk_register_clkdev(clk, "osc_32k_clk", NULL);
 124
 125         clk = clk_register_fixed_rate(NULL, "osc_30m_clk", NULL, CLK_IS_ROOT,
 126                         30000000);
 127         clk_register_clkdev(clk, "osc_30m_clk", NULL);
 128
 129         /* clock derived from 32 KHz osc clk */
 130         clk = clk_register_gate(NULL, "rtc_spear", "osc_32k_clk", 0,
 131                         PERIP1_CLK_ENB, RTC_CLK_ENB, 0, &_lock);
 132         clk_register_clkdev(clk, NULL, "rtc-spear");
 133
 134         /* clock derived from 30 MHz osc clk */
 135         clk = clk_register_fixed_rate(NULL, "pll3_clk", "osc_24m_clk", 0,
 136                         48000000);
 137         clk_register_clkdev(clk, "pll3_clk", NULL);
 138
 139         clk = clk_register_vco_pll("vco1_clk", "pll1_clk", NULL, "osc_30m_clk",
 140                         0, PLL1_CTR, PLL1_FRQ, pll_rtbl, ARRAY_SIZE(pll_rtbl),
 141                         &_lock, &clk1, NULL);
 142         clk_register_clkdev(clk, "vco1_clk", NULL);
 143         clk_register_clkdev(clk1, "pll1_clk", NULL);
 144
 145         clk = clk_register_vco_pll("vco2_clk", "pll2_clk", NULL, "osc_30m_clk",
 146                         0, PLL2_CTR, PLL2_FRQ, pll_rtbl, ARRAY_SIZE(pll_rtbl),
 147                         &_lock, &clk1, NULL);
 148         clk_register_clkdev(clk, "vco2_clk", NULL);
 149         clk_register_clkdev(clk1, "pll2_clk", NULL);
 150
 151         clk = clk_register_fixed_factor(NULL, "wdt_clk", "osc_30m_clk", 0, 1,
 152                         1);
 153         clk_register_clkdev(clk, NULL, "wdt");
 154
 155         /* clock derived from pll1 clk */
 156         clk = clk_register_fixed_factor(NULL, "cpu_clk", "pll1_clk",
 157                         CLK_SET_RATE_PARENT, 1, 1);
 158         clk_register_clkdev(clk, "cpu_clk", NULL);
 159
 160         clk = clk_register_divider(NULL, "ahb_clk", "pll1_clk",
 161                         CLK_SET_RATE_PARENT, CORE_CLK_CFG, HCLK_RATIO_SHIFT,
 162                         HCLK_RATIO_MASK, 0, &_lock);
 163         clk_register_clkdev(clk, "ahb_clk", NULL);
 164
 165         clk = clk_register_aux("uart_syn_clk", "uart_syn_gclk", "pll1_clk", 0,
 166                         UART_CLK_SYNT, NULL, aux_rtbl, ARRAY_SIZE(aux_rtbl),
 167                         &_lock, &clk1);
 168         clk_register_clkdev(clk, "uart_syn_clk", NULL);
 169         clk_register_clkdev(clk1, "uart_syn_gclk", NULL);
 170
 171         clk = clk_register_mux(NULL, "uart_mclk", uart_parents,
 172                         ARRAY_SIZE(uart_parents), CLK_SET_RATE_NO_REPARENT,
 173                         PERIP_CLK_CFG, UART_CLK_SHIFT, UART_CLK_MASK, 0,
 174                         &_lock);
 175         clk_register_clkdev(clk, "uart_mclk", NULL);
 176
 177         clk = clk_register_gate(NULL, "uart0", "uart_mclk", 0, PERIP1_CLK_ENB,
 178                         UART0_CLK_ENB, 0, &_lock);
 179         clk_register_clkdev(clk, NULL, "d0000000.serial");
 180
 181         clk = clk_register_gate(NULL, "uart1", "uart_mclk", 0, PERIP1_CLK_ENB,
 182                         UART1_CLK_ENB, 0, &_lock);
 183         clk_register_clkdev(clk, NULL, "d0080000.serial");
 184
 185         clk = clk_register_aux("firda_syn_clk", "firda_syn_gclk", "pll1_clk",
 186                         0, FIRDA_CLK_SYNT, NULL, aux_rtbl, ARRAY_SIZE(aux_rtbl),
 187                         &_lock, &clk1);
 188         clk_register_clkdev(clk, "firda_syn_clk", NULL);
 189         clk_register_clkdev(clk1, "firda_syn_gclk", NULL);
 190
 191         clk = clk_register_mux(NULL, "firda_mclk", firda_parents,
 192                         ARRAY_SIZE(firda_parents), CLK_SET_RATE_NO_REPARENT,
 193                         PERIP_CLK_CFG, FIRDA_CLK_SHIFT, FIRDA_CLK_MASK, 0,
 194                         &_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), CLK_SET_RATE_NO_REPARENT,
 209                         PERIP_CLK_CFG, CLCD_CLK_SHIFT, CLCD_CLK_MASK, 0,
 210                         &_lock);
 211         clk_register_clkdev(clk, "clcd_mclk", NULL);
 212
 213         clk = clk_register_gate(NULL, "clcd_clk", "clcd_mclk", 0,
 214                         PERIP1_CLK_ENB, CLCD_CLK_ENB, 0, &_lock);
 215         clk_register_clkdev(clk, NULL, "clcd");
 216
 217         /* gpt clocks */
 218         clk = clk_register_gpt("gpt0_1_syn_clk", "pll1_clk", 0, PRSC0_CLK_CFG,
 219                         gpt_rtbl, ARRAY_SIZE(gpt_rtbl), &_lock);
 220         clk_register_clkdev(clk, "gpt0_1_syn_clk", NULL);
 221
 222         clk = clk_register_mux(NULL, "gpt0_mclk", gpt0_1_parents,
 223                         ARRAY_SIZE(gpt0_1_parents), CLK_SET_RATE_NO_REPARENT,
 224                         PERIP_CLK_CFG, GPT0_CLK_SHIFT, GPT_CLK_MASK, 0, &_lock);
 225         clk_register_clkdev(clk, NULL, "gpt0");
 226
 227         clk = clk_register_mux(NULL, "gpt1_mclk", gpt0_1_parents,
 228                         ARRAY_SIZE(gpt0_1_parents), CLK_SET_RATE_NO_REPARENT,
 229                         PERIP_CLK_CFG, GPT1_CLK_SHIFT, GPT_CLK_MASK, 0, &_lock);
 230         clk_register_clkdev(clk, "gpt1_mclk", NULL);
 231
 232         clk = clk_register_gate(NULL, "gpt1_clk", "gpt1_mclk", 0,
 233                         PERIP1_CLK_ENB, GPT1_CLK_ENB, 0, &_lock);
 234         clk_register_clkdev(clk, NULL, "gpt1");
 235
 236         clk = clk_register_gpt("gpt2_syn_clk", "pll1_clk", 0, PRSC1_CLK_CFG,
 237                         gpt_rtbl, ARRAY_SIZE(gpt_rtbl), &_lock);
 238         clk_register_clkdev(clk, "gpt2_syn_clk", NULL);
 239
 240         clk = clk_register_mux(NULL, "gpt2_mclk", gpt2_parents,
 241                         ARRAY_SIZE(gpt2_parents), CLK_SET_RATE_NO_REPARENT,
 242                         PERIP_CLK_CFG, GPT2_CLK_SHIFT, GPT_CLK_MASK, 0, &_lock);
 243         clk_register_clkdev(clk, "gpt2_mclk", NULL);
 244
 245         clk = clk_register_gate(NULL, "gpt2_clk", "gpt2_mclk", 0,
 246                         PERIP1_CLK_ENB, GPT2_CLK_ENB, 0, &_lock);
 247         clk_register_clkdev(clk, NULL, "gpt2");
 248
 249         clk = clk_register_gpt("gpt3_syn_clk", "pll1_clk", 0, PRSC2_CLK_CFG,
 250                         gpt_rtbl, ARRAY_SIZE(gpt_rtbl), &_lock);
 251         clk_register_clkdev(clk, "gpt3_syn_clk", NULL);
 252
 253         clk = clk_register_mux(NULL, "gpt3_mclk", gpt3_parents,
 254                         ARRAY_SIZE(gpt3_parents), CLK_SET_RATE_NO_REPARENT,
 255                         PERIP_CLK_CFG, GPT3_CLK_SHIFT, GPT_CLK_MASK, 0, &_lock);
 256         clk_register_clkdev(clk, "gpt3_mclk", NULL);
 257
 258         clk = clk_register_gate(NULL, "gpt3_clk", "gpt3_mclk", 0,
 259                         PERIP1_CLK_ENB, GPT3_CLK_ENB, 0, &_lock);
 260         clk_register_clkdev(clk, NULL, "gpt3");
 261
 262         /* clock derived from pll3 clk */
 263         clk = clk_register_gate(NULL, "usbh0_clk", "pll3_clk", 0,
 264                         PERIP1_CLK_ENB, USBH0_CLK_ENB, 0, &_lock);
 265         clk_register_clkdev(clk, NULL, "e1800000.ehci");
 266         clk_register_clkdev(clk, NULL, "e1900000.ohci");
 267
 268         clk = clk_register_gate(NULL, "usbh1_clk", "pll3_clk", 0,
 269                         PERIP1_CLK_ENB, USBH1_CLK_ENB, 0, &_lock);
 270         clk_register_clkdev(clk, NULL, "e2000000.ehci");
 271         clk_register_clkdev(clk, NULL, "e2100000.ohci");
 272
 273         clk = clk_register_gate(NULL, "usbd_clk", "pll3_clk", 0, PERIP1_CLK_ENB,
 274                         USBD_CLK_ENB, 0, &_lock);
 275         clk_register_clkdev(clk, NULL, "designware_udc");
 276
 277         /* clock derived from ahb clk */
 278         clk = clk_register_fixed_factor(NULL, "ahbmult2_clk", "ahb_clk", 0, 2,
 279                         1);
 280         clk_register_clkdev(clk, "ahbmult2_clk", NULL);
 281
 282         clk = clk_register_mux(NULL, "ddr_clk", ddr_parents,
 283                         ARRAY_SIZE(ddr_parents), CLK_SET_RATE_NO_REPARENT,
 284                         PLL_CLK_CFG, MCTR_CLK_SHIFT, MCTR_CLK_MASK, 0, &_lock);
 285         clk_register_clkdev(clk, "ddr_clk", NULL);
 286
 287         clk = clk_register_divider(NULL, "apb_clk", "ahb_clk",
 288                         CLK_SET_RATE_PARENT, CORE_CLK_CFG, PCLK_RATIO_SHIFT,
 289                         PCLK_RATIO_MASK, 0, &_lock);
 290         clk_register_clkdev(clk, "apb_clk", NULL);
 291
 292         clk = clk_register_gate(NULL, "dma_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
 293                         DMA_CLK_ENB, 0, &_lock);
 294         clk_register_clkdev(clk, NULL, "fc400000.dma");
 295
 296         clk = clk_register_gate(NULL, "fsmc_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
 297                         FSMC_CLK_ENB, 0, &_lock);
 298         clk_register_clkdev(clk, NULL, "d1800000.flash");
 299
 300         clk = clk_register_gate(NULL, "gmac_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
 301                         GMAC_CLK_ENB, 0, &_lock);
 302         clk_register_clkdev(clk, NULL, "e0800000.ethernet");
 303
 304         clk = clk_register_gate(NULL, "i2c_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
 305                         I2C_CLK_ENB, 0, &_lock);
 306         clk_register_clkdev(clk, NULL, "d0200000.i2c");
 307
 308         clk = clk_register_gate(NULL, "jpeg_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
 309                         JPEG_CLK_ENB, 0, &_lock);
 310         clk_register_clkdev(clk, NULL, "jpeg");
 311
 312         clk = clk_register_gate(NULL, "smi_clk", "ahb_clk", 0, PERIP1_CLK_ENB,
 313                         SMI_CLK_ENB, 0, &_lock);
 314         clk_register_clkdev(clk, NULL, "fc000000.flash");
 315
 316         /* clock derived from apb clk */
 317         clk = clk_register_gate(NULL, "adc_clk", "apb_clk", 0, PERIP1_CLK_ENB,
 318                         ADC_CLK_ENB, 0, &_lock);
 319         clk_register_clkdev(clk, NULL, "adc");
 320
 321         clk = clk_register_fixed_factor(NULL, "gpio0_clk", "apb_clk", 0, 1, 1);
 322         clk_register_clkdev(clk, NULL, "f0100000.gpio");
 323
 324         clk = clk_register_gate(NULL, "gpio1_clk", "apb_clk", 0, PERIP1_CLK_ENB,
 325                         GPIO1_CLK_ENB, 0, &_lock);
 326         clk_register_clkdev(clk, NULL, "fc980000.gpio");
 327
 328         clk = clk_register_gate(NULL, "gpio2_clk", "apb_clk", 0, PERIP1_CLK_ENB,
 329                         GPIO2_CLK_ENB, 0, &_lock);
 330         clk_register_clkdev(clk, NULL, "d8100000.gpio");
 331
 332         clk = clk_register_gate(NULL, "ssp0_clk", "apb_clk", 0, PERIP1_CLK_ENB,
 333                         SSP0_CLK_ENB, 0, &_lock);
 334         clk_register_clkdev(clk, NULL, "ssp-pl022.0");
 335
 336         clk = clk_register_gate(NULL, "ssp1_clk", "apb_clk", 0, PERIP1_CLK_ENB,
 337                         SSP1_CLK_ENB, 0, &_lock);
 338         clk_register_clkdev(clk, NULL, "ssp-pl022.1");
 339
 340         clk = clk_register_gate(NULL, "ssp2_clk", "apb_clk", 0, PERIP1_CLK_ENB,
 341                         SSP2_CLK_ENB, 0, &_lock);
 342         clk_register_clkdev(clk, NULL, "ssp-pl022.2");
 343 }