target/linux/ar71xx/files/arch/mips/ar71xx/setup.c

   1 /*
   2  *  Atheros AR71xx SoC specific setup
   3  *
   4  *  Copyright (C) 2010-2011 Jaiganesh Narayanan <jnarayanan@atheros.com>
   5  *  Copyright (C) 2008-2009 Gabor Juhos <juhosg@openwrt.org>
   6  *  Copyright (C) 2008 Imre Kaloz <kaloz@openwrt.org>
   7  *
   8  *  Parts of this file are based on Atheros 2.6.15 BSP
   9  *  Parts of this file are based on Atheros 2.6.31 BSP
  10  *
  11  *  This program is free software; you can redistribute it and/or modify it
  12  *  under the terms of the GNU General Public License version 2 as published
  13  *  by the Free Software Foundation.
  14  */
  15
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18 #include <linux/bootmem.h>
  19
  20 #include <asm/bootinfo.h>
  21 #include <asm/time.h>           /* for mips_hpt_frequency */
  22 #include <asm/reboot.h>         /* for _machine_{restart,halt} */
  23 #include <asm/mips_machine.h>
  24
  25 #include <asm/mach-ar71xx/ar71xx.h>
  26
  27 #include "machtype.h"
  28 #include "devices.h"
  29
  30 #define AR71XX_SYS_TYPE_LEN     64
  31
  32 u32 ar71xx_cpu_freq;
  33 EXPORT_SYMBOL_GPL(ar71xx_cpu_freq);
  34
  35 u32 ar71xx_ahb_freq;
  36 EXPORT_SYMBOL_GPL(ar71xx_ahb_freq);
  37
  38 u32 ar71xx_ddr_freq;
  39 EXPORT_SYMBOL_GPL(ar71xx_ddr_freq);
  40
  41 u32 ar71xx_ref_freq;
  42 EXPORT_SYMBOL_GPL(ar71xx_ref_freq);
  43
  44 enum ar71xx_soc_type ar71xx_soc;
  45 EXPORT_SYMBOL_GPL(ar71xx_soc);
  46
  47 static char ar71xx_sys_type[AR71XX_SYS_TYPE_LEN];
  48
  49 static void ar71xx_restart(char *command)
  50 {
  51         ar71xx_device_stop(RESET_MODULE_FULL_CHIP);
  52         for (;;)
  53                 if (cpu_wait)
  54                         cpu_wait();
  55 }
  56
  57 static void ar71xx_halt(void)
  58 {
  59         while (1)
  60                 cpu_wait();
  61 }
  62
  63 static void __init ar71xx_detect_mem_size(void)
  64 {
  65         unsigned long size;
  66
  67         for (size = AR71XX_MEM_SIZE_MIN; size < AR71XX_MEM_SIZE_MAX;
  68              size <<= 1) {
  69                 if (!memcmp(ar71xx_detect_mem_size,
  70                             ar71xx_detect_mem_size + size, 1024))
  71                         break;
  72         }
  73
  74         add_memory_region(0, size, BOOT_MEM_RAM);
  75 }
  76
  77 static void __init ar71xx_detect_sys_type(void)
  78 {
  79         char *chip = "????";
  80         u32 id;
  81         u32 major;
  82         u32 minor;
  83         u32 rev = 0;
  84
  85         id = ar71xx_reset_rr(AR71XX_RESET_REG_REV_ID);
  86         major = id & REV_ID_MAJOR_MASK;
  87
  88         switch (major) {
  89         case REV_ID_MAJOR_AR71XX:
  90                 minor = id & AR71XX_REV_ID_MINOR_MASK;
  91                 rev = id >> AR71XX_REV_ID_REVISION_SHIFT;
  92                 rev &= AR71XX_REV_ID_REVISION_MASK;
  93                 switch (minor) {
  94                 case AR71XX_REV_ID_MINOR_AR7130:
  95                         ar71xx_soc = AR71XX_SOC_AR7130;
  96                         chip = "7130";
  97                         break;
  98
  99                 case AR71XX_REV_ID_MINOR_AR7141:
 100                         ar71xx_soc = AR71XX_SOC_AR7141;
 101                         chip = "7141";
 102                         break;
 103
 104                 case AR71XX_REV_ID_MINOR_AR7161:
 105                         ar71xx_soc = AR71XX_SOC_AR7161;
 106                         chip = "7161";
 107                         break;
 108                 }
 109                 break;
 110
 111         case REV_ID_MAJOR_AR7240:
 112                 ar71xx_soc = AR71XX_SOC_AR7240;
 113                 chip = "7240";
 114                 rev = id & AR724X_REV_ID_REVISION_MASK;
 115                 break;
 116
 117         case REV_ID_MAJOR_AR7241:
 118                 ar71xx_soc = AR71XX_SOC_AR7241;
 119                 chip = "7241";
 120                 rev = id & AR724X_REV_ID_REVISION_MASK;
 121                 break;
 122
 123         case REV_ID_MAJOR_AR7242:
 124                 ar71xx_soc = AR71XX_SOC_AR7242;
 125                 chip = "7242";
 126                 rev = id & AR724X_REV_ID_REVISION_MASK;
 127                 break;
 128
 129         case REV_ID_MAJOR_AR913X:
 130                 minor = id & AR91XX_REV_ID_MINOR_MASK;
 131                 rev = id >> AR91XX_REV_ID_REVISION_SHIFT;
 132                 rev &= AR91XX_REV_ID_REVISION_MASK;
 133                 switch (minor) {
 134                 case AR91XX_REV_ID_MINOR_AR9130:
 135                         ar71xx_soc = AR71XX_SOC_AR9130;
 136                         chip = "9130";
 137                         break;
 138
 139                 case AR91XX_REV_ID_MINOR_AR9132:
 140                         ar71xx_soc = AR71XX_SOC_AR9132;
 141                         chip = "9132";
 142                         break;
 143                 }
 144                 break;
 145
 146         case REV_ID_MAJOR_AR9330:
 147                 ar71xx_soc = AR71XX_SOC_AR9330;
 148                 chip = "9330";
 149                 rev = id & AR933X_REV_ID_REVISION_MASK;
 150                 break;
 151
 152         case REV_ID_MAJOR_AR9331:
 153                 ar71xx_soc = AR71XX_SOC_AR9331;
 154                 chip = "9331";
 155                 rev = id & AR933X_REV_ID_REVISION_MASK;
 156                 break;
 157
 158         case REV_ID_MAJOR_AR9342:
 159                 ar71xx_soc = AR71XX_SOC_AR9342;
 160                 chip = "9342";
 161                 rev = id & AR934X_REV_ID_REVISION_MASK;
 162                 break;
 163
 164         case REV_ID_MAJOR_AR9344:
 165                 ar71xx_soc = AR71XX_SOC_AR9344;
 166                 chip = "9344";
 167                 rev = id & AR934X_REV_ID_REVISION_MASK;
 168                 break;
 169
 170         default:
 171                 panic("ar71xx: unknown chip id:0x%08x\n", id);
 172         }
 173
 174         sprintf(ar71xx_sys_type, "Atheros AR%s rev %u", chip, rev);
 175         pr_info("SoC: %s\n", ar71xx_sys_type);
 176 }
 177
 178 static void __init ar934x_detect_sys_frequency(void)
 179 {
 180         u32 pll, out_div, ref_div, nint, frac, clk_ctrl, postdiv;
 181
 182         if (ar71xx_reset_rr(AR934X_RESET_REG_BOOTSTRAP) & AR934X_REF_CLK_40)
 183                 ar71xx_ref_freq = 40 * 1000 * 1000;
 184         else
 185                 ar71xx_ref_freq = 25 * 1000 * 1000;
 186
 187         clk_ctrl = ar71xx_pll_rr(AR934X_PLL_REG_DDR_CTRL_CLOCK);
 188
 189         pll = ar71xx_pll_rr(AR934X_PLL_REG_CPU_CONFIG);
 190         out_div = AR934X_CPU_PLL_CFG_OUTDIV_GET(pll);
 191         ref_div = AR934X_CPU_PLL_CFG_REFDIV_GET(pll);
 192         nint    = AR934X_CPU_PLL_CFG_NINT_GET(pll);
 193         frac    = AR934X_CPU_PLL_CFG_NFRAC_GET(pll);
 194         postdiv = AR934X_CPU_DDR_CLK_CTRL_CPU_POST_DIV_GET(clk_ctrl);
 195         ar71xx_cpu_freq = ((nint * ar71xx_ref_freq / ref_div) >> out_div) /
 196                           (postdiv + 1);
 197
 198         out_div = AR934X_DDR_PLL_CFG_OUTDIV_GET(pll);
 199         ref_div = AR934X_DDR_PLL_CFG_REFDIV_GET(pll);
 200         nint    = AR934X_DDR_PLL_CFG_NINT_GET(pll);
 201         frac    = AR934X_DDR_PLL_CFG_NFRAC_GET(pll);
 202         postdiv = AR934X_CPU_DDR_CLK_CTRL_DDR_POST_DIV_GET(clk_ctrl);
 203         ar71xx_ddr_freq = ((nint * ar71xx_ref_freq / ref_div) >> out_div) /
 204                           (postdiv + 1);
 205
 206         postdiv = AR934X_CPU_DDR_CLK_CTRL_AHB_POST_DIV_GET(clk_ctrl);
 207
 208         if (AR934X_CPU_DDR_CLK_CTRL_AHBCLK_FROM_DDRPLL_GET(clk_ctrl)) {
 209                 ar71xx_ahb_freq = ar71xx_ddr_freq / (postdiv + 1);
 210         } else {
 211                 ar71xx_ahb_freq = ar71xx_cpu_freq / (postdiv + 1);
 212         }
 213
 214 }
 215
 216 static void __init ar91xx_detect_sys_frequency(void)
 217 {
 218         u32 pll;
 219         u32 freq;
 220         u32 div;
 221
 222         ar71xx_ref_freq = 5 * 1000 * 1000;
 223
 224         pll = ar71xx_pll_rr(AR91XX_PLL_REG_CPU_CONFIG);
 225
 226         div = ((pll >> AR91XX_PLL_DIV_SHIFT) & AR91XX_PLL_DIV_MASK);
 227         freq = div * ar71xx_ref_freq;
 228
 229         ar71xx_cpu_freq = freq;
 230
 231         div = ((pll >> AR91XX_DDR_DIV_SHIFT) & AR91XX_DDR_DIV_MASK) + 1;
 232         ar71xx_ddr_freq = freq / div;
 233
 234         div = (((pll >> AR91XX_AHB_DIV_SHIFT) & AR91XX_AHB_DIV_MASK) + 1) * 2;
 235         ar71xx_ahb_freq = ar71xx_cpu_freq / div;
 236 }
 237
 238 static void __init ar71xx_detect_sys_frequency(void)
 239 {
 240         u32 pll;
 241         u32 freq;
 242         u32 div;
 243
 244         ar71xx_ref_freq = 40 * 1000 * 1000;
 245
 246         pll = ar71xx_pll_rr(AR71XX_PLL_REG_CPU_CONFIG);
 247
 248         div = ((pll >> AR71XX_PLL_DIV_SHIFT) & AR71XX_PLL_DIV_MASK) + 1;
 249         freq = div * ar71xx_ref_freq;
 250
 251         div = ((pll >> AR71XX_CPU_DIV_SHIFT) & AR71XX_CPU_DIV_MASK) + 1;
 252         ar71xx_cpu_freq = freq / div;
 253
 254         div = ((pll >> AR71XX_DDR_DIV_SHIFT) & AR71XX_DDR_DIV_MASK) + 1;
 255         ar71xx_ddr_freq = freq / div;
 256
 257         div = (((pll >> AR71XX_AHB_DIV_SHIFT) & AR71XX_AHB_DIV_MASK) + 1) * 2;
 258         ar71xx_ahb_freq = ar71xx_cpu_freq / div;
 259 }
 260
 261 static void __init ar724x_detect_sys_frequency(void)
 262 {
 263         u32 pll;
 264         u32 freq;
 265         u32 div;
 266
 267         ar71xx_ref_freq = 5 * 1000 * 1000;
 268
 269         pll = ar71xx_pll_rr(AR724X_PLL_REG_CPU_CONFIG);
 270
 271         div = ((pll >> AR724X_PLL_DIV_SHIFT) & AR724X_PLL_DIV_MASK);
 272         freq = div * ar71xx_ref_freq;
 273
 274         div = ((pll >> AR724X_PLL_REF_DIV_SHIFT) & AR724X_PLL_REF_DIV_MASK);
 275         freq *= div;
 276
 277         ar71xx_cpu_freq = freq;
 278
 279         div = ((pll >> AR724X_DDR_DIV_SHIFT) & AR724X_DDR_DIV_MASK) + 1;
 280         ar71xx_ddr_freq = freq / div;
 281
 282         div = (((pll >> AR724X_AHB_DIV_SHIFT) & AR724X_AHB_DIV_MASK) + 1) * 2;
 283         ar71xx_ahb_freq = ar71xx_cpu_freq / div;
 284 }
 285
 286 static void __init detect_sys_frequency(void)
 287 {
 288         switch (ar71xx_soc) {
 289         case AR71XX_SOC_AR7130:
 290         case AR71XX_SOC_AR7141:
 291         case AR71XX_SOC_AR7161:
 292                 ar71xx_detect_sys_frequency();
 293                 break;
 294
 295         case AR71XX_SOC_AR7240:
 296         case AR71XX_SOC_AR7241:
 297         case AR71XX_SOC_AR7242:
 298                 ar724x_detect_sys_frequency();
 299                 break;
 300
 301         case AR71XX_SOC_AR9130:
 302         case AR71XX_SOC_AR9132:
 303                 ar91xx_detect_sys_frequency();
 304                 break;
 305
 306         case AR71XX_SOC_AR9341:
 307         case AR71XX_SOC_AR9342:
 308         case AR71XX_SOC_AR9344:
 309                 ar934x_detect_sys_frequency();
 310                 break;
 311         default:
 312                 BUG();
 313         }
 314 }
 315
 316 const char *get_system_type(void)
 317 {
 318         return ar71xx_sys_type;
 319 }
 320
 321 unsigned int __cpuinit get_c0_compare_irq(void)
 322 {
 323         return CP0_LEGACY_COMPARE_IRQ;
 324 }
 325
 326 void __init plat_mem_setup(void)
 327 {
 328         set_io_port_base(KSEG1);
 329
 330         ar71xx_ddr_base = ioremap_nocache(AR71XX_DDR_CTRL_BASE,
 331                                                 AR71XX_DDR_CTRL_SIZE);
 332
 333         ar71xx_pll_base = ioremap_nocache(AR71XX_PLL_BASE,
 334                                                 AR71XX_PLL_SIZE);
 335
 336         ar71xx_reset_base = ioremap_nocache(AR71XX_RESET_BASE,
 337                                                 AR71XX_RESET_SIZE);
 338
 339         ar71xx_gpio_base = ioremap_nocache(AR71XX_GPIO_BASE, AR71XX_GPIO_SIZE);
 340
 341         ar71xx_usb_ctrl_base = ioremap_nocache(AR71XX_USB_CTRL_BASE,
 342                                                 AR71XX_USB_CTRL_SIZE);
 343
 344         ar71xx_detect_mem_size();
 345         ar71xx_detect_sys_type();
 346         detect_sys_frequency();
 347
 348         pr_info("Clocks: CPU:%u.%03uMHz, DDR:%u.%03uMHz, AHB:%u.%03uMHz, "
 349                 "Ref:%u.%03uMHz",
 350                 ar71xx_cpu_freq / 1000000, (ar71xx_cpu_freq / 1000) % 1000,
 351                 ar71xx_ddr_freq / 1000000, (ar71xx_ddr_freq / 1000) % 1000,
 352                 ar71xx_ahb_freq / 1000000, (ar71xx_ahb_freq / 1000) % 1000,
 353                 ar71xx_ref_freq / 1000000, (ar71xx_ref_freq / 1000) % 1000);
 354
 355         _machine_restart = ar71xx_restart;
 356         _machine_halt = ar71xx_halt;
 357         pm_power_off = ar71xx_halt;
 358 }
 359
 360 void __init plat_time_init(void)
 361 {
 362         mips_hpt_frequency = ar71xx_cpu_freq / 2;
 363 }
 364
 365 __setup("board=", mips_machtype_setup);
 366
 367 static int __init ar71xx_machine_setup(void)
 368 {
 369         ar71xx_gpio_init();
 370
 371         ar71xx_add_device_uart();
 372         ar71xx_add_device_wdt();
 373
 374         mips_machine_setup();
 375         return 0;
 376 }
 377
 378 arch_initcall(ar71xx_machine_setup);
 379
 380 static void __init ar71xx_generic_init(void)
 381 {
 382         /* Nothing to do */
 383 }
 384
 385 MIPS_MACHINE(AR71XX_MACH_GENERIC, "Generic", "Generic AR71xx board",
 386              ar71xx_generic_init);